u-boot: Update yaffs2 file system

This patch updates the yaffs2 in u-boot to correspond to
git://www.aleph1.co.uk/yaffs2
commit id 9ee5d0643e559568dbe62215f76e0a7bd5a63d93

Signed-off-by: Charles Manning <cdhmanning@gmail.com>

63 files changed, 13517 insertions, 10044 deletions

diff --git a/common/cmd_yaffs2.c b/common/cmd_yaffs2.c
index 0e22d90..d43a9d4 100644
--- a/common/cmd_yaffs2.c
+++ b/common/cmd_yaffs2.c
@@ -1,18 +1,37 @@
+/* Yaffs commands.
+ * Modified by Charles Manning by adding ydevconfig command.
+ *
+ * Use ydevconfig to configure a mountpoint before use.
+ * For example:
+ *  # Configure mountpt xxx using nand device 0 using blocks 100-500
+ *  ydevconfig xxx 0 100 500
+ *  # Mount it
+ *  ymount xxx
+ *  # yls, yrdm etc
+ *  yls -l xxx
+ *  yrdm xxx/boot-image 82000000
+ *  ...
+ */
+
 #include <common.h>
 
 #include <config.h>
 #include <command.h>
 
-#ifdef  YAFFS2_DEBUG
-#define PRINTF(fmt,args...) printf (fmt ,##args)
+#ifdef YAFFS2_DEBUG
+#define PRINTF(fmt, args...) printf(fmt, ##args)
 #else
-#define PRINTF(fmt,args...)
+#define PRINTF(fmt, args...) do { } while (0)
 #endif
 
+extern void cmd_yaffs_dev_ls(void);
+extern void cmd_yaffs_tracemask(unsigned set, unsigned mask);
+extern void cmd_yaffs_devconfig(char *mp, int flash_dev,
+				int start_block, int end_block);
 extern void cmd_yaffs_mount(char *mp);
 extern void cmd_yaffs_umount(char *mp);
 extern void cmd_yaffs_read_file(char *fn);
-extern void cmd_yaffs_write_file(char *fn,char bval,int sizeOfFile);
+extern void cmd_yaffs_write_file(char *fn, char bval, int sizeOfFile);
 extern void cmd_yaffs_ls(const char *mountpt, int longlist);
 extern void cmd_yaffs_mwrite_file(char *fn, char *addr, int size);
 extern void cmd_yaffs_mread_file(char *fn, char *addr);
@@ -21,193 +40,287 @@ extern void cmd_yaffs_rmdir(const char *dir);
 extern void cmd_yaffs_rm(const char *path);
 extern void cmd_yaffs_mv(const char *oldPath, const char *newPath);
 
-extern int yaffs_DumpDevStruct(const char *path);
+extern int yaffs_dump_dev(const char *path);
+
+/* ytrace - show/set yaffs trace mask */
+int do_ytrace(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	if (argc > 1)
+		cmd_yaffs_tracemask(1, simple_strtol(argv[1], NULL, 16));
+	else
+		cmd_yaffs_tracemask(0, 0);
 
+	return 0;
+}
 
-int do_ymount (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+/* ydevls - lists yaffs mount points. */
+int do_ydevls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *mtpoint = argv[1];
-    cmd_yaffs_mount(mtpoint);
+	cmd_yaffs_dev_ls();
 
-    return(0);
+	return 0;
 }
 
-int do_yumount (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+/* ydevconfig mount_pt mtd_dev_num start_block end_block */
+int do_ydevconfig(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *mtpoint = argv[1];
-    cmd_yaffs_umount(mtpoint);
+	char *mtpoint;
+	int mtd_dev;
+	int start_block;
+	int end_block;
+
+	if (argc != 5) {
+		printf
+		    ("Bad arguments: ydevconfig mount_pt mtd_dev start_block end_block\n");
+		return -1;
+	}
+
+	mtpoint = argv[1];
+	mtd_dev = simple_strtol(argv[2], NULL, 16);
+	start_block = simple_strtol(argv[3], NULL, 16);
+	end_block = simple_strtol(argv[4], NULL, 16);
 
-    return(0);
+	cmd_yaffs_devconfig(mtpoint, mtd_dev, start_block, end_block);
+
+	return 0;
 }
 
-int do_yls (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_ymount(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *dirname = argv[argc-1];
+	char *mtpoint;
+
+	if (argc != 2) {
+		printf("Bad arguments: ymount mount_pt\n");
+		return -1;
+	}
+
+	mtpoint = argv[1];
+	printf("Mounting yaffs2 mount point %s\n", mtpoint);
 
-    cmd_yaffs_ls(dirname, (argc>2)?1:0);
+	cmd_yaffs_mount(mtpoint);
 
-    return(0);
+	return 0;
 }
 
-int do_yrd (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_yumount(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *filename = argv[1];
-    printf ("Reading file %s ", filename);
+	char *mtpoint;
 
-    cmd_yaffs_read_file(filename);
+	if (argc != 2) {
+		printf("Bad arguments: yumount mount_pt\n");
+		return -1;
+	}
 
-    printf ("done\n");
-    return(0);
+	mtpoint = argv[1];
+	printf("Unmounting yaffs2 mount point %s\n", mtpoint);
+	cmd_yaffs_umount(mtpoint);
+
+	return 0;
 }
 
-int do_ywr (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_yls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *filename = argv[1];
-    ulong value = simple_strtoul(argv[2], NULL, 16);
-    ulong numValues = simple_strtoul(argv[3], NULL, 16);
+	char *dirname;
+
+	if (argc < 2 || argc > 3 || (argc == 3 && strcmp(argv[1], "-l"))) {
+		printf("Bad arguments: yls [-l] dir\n");
+		return -1;
+	}
 
-    printf ("Writing value (%lx) %lx times to %s... ", value, numValues, filename);
+	dirname = argv[argc - 1];
 
-    cmd_yaffs_write_file(filename,value,numValues);
+	cmd_yaffs_ls(dirname, (argc > 2) ? 1 : 0);
 
-    printf ("done\n");
-    return(0);
+	return 0;
 }
 
-int do_yrdm (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_yrd(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *filename = argv[1];
-    ulong addr = simple_strtoul(argv[2], NULL, 16);
+	char *filename;
+
+	if (argc != 2) {
+		printf("Bad arguments: yrd file_name\n");
+		return -1;
+	}
 
-    cmd_yaffs_mread_file(filename, (char *)addr);
+	filename = argv[1];
 
-    return(0);
+	printf("Reading file %s ", filename);
+
+	cmd_yaffs_read_file(filename);
+
+	printf("done\n");
+	return 0;
 }
 
-int do_ywrm (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_ywr(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *filename = argv[1];
-    ulong addr = simple_strtoul(argv[2], NULL, 16);
-    ulong size = simple_strtoul(argv[3], NULL, 16);
+	char *filename;
+	ulong value;
+	ulong numValues;
+
+	if (argc != 4) {
+		printf("Bad arguments: ywr file_name value n_values\n");
+		return -1;
+	}
 
-    cmd_yaffs_mwrite_file(filename, (char *)addr, size);
+	filename = argv[1];
+	value = simple_strtoul(argv[2], NULL, 16);
+	numValues = simple_strtoul(argv[3], NULL, 16);
 
-    return(0);
+	printf("Writing value (%lx) %lx times to %s... ", value, numValues,
+	       filename);
+
+	cmd_yaffs_write_file(filename, value, numValues);
+
+	printf("done\n");
+	return 0;
 }
 
-int do_ymkdir (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_yrdm(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *dirname = argv[1];
+	char *filename;
+	ulong addr;
+
+	if (argc != 3) {
+		printf("Bad arguments: yrdm file_name addr\n");
+		return -1;
+	}
 
-    cmd_yaffs_mkdir(dirname);
+	filename = argv[1];
+	addr = simple_strtoul(argv[2], NULL, 16);
 
-    return(0);
+	cmd_yaffs_mread_file(filename, (char *)addr);
+
+	return 0;
 }
 
-int do_yrmdir (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_ywrm(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *dirname = argv[1];
+	char *filename;
+	ulong addr;
+	ulong size;
+
+	if (argc != 4) {
+		printf("Bad arguments: ywrm file_name addr size\n");
+		return -1;
+	}
+
+	filename = argv[1];
+	addr = simple_strtoul(argv[2], NULL, 16);
+	size = simple_strtoul(argv[3], NULL, 16);
 
-    cmd_yaffs_rmdir(dirname);
+	cmd_yaffs_mwrite_file(filename, (char *)addr, size);
 
-    return(0);
+	return 0;
 }
 
-int do_yrm (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_ymkdir(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *path = argv[1];
+	char *dirname;
 
-    cmd_yaffs_rm(path);
+	if (argc != 2) {
+		printf("Bad arguments: ymkdir dir_name\n");
+		return -1;
+	}
 
-    return(0);
+	dirname = argv[1];
+	cmd_yaffs_mkdir(dirname);
+
+	return 0;
 }
 
-int do_ymv (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_yrmdir(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *oldPath = argv[1];
-    char *newPath = argv[2];
+	char *dirname;
+
+	if (argc != 2) {
+		printf("Bad arguments: yrmdir dir_name\n");
+		return -1;
+	}
 
-    cmd_yaffs_mv(newPath, oldPath);
+	dirname = argv[1];
+	cmd_yaffs_rmdir(dirname);
 
-    return(0);
+	return 0;
 }
 
-int do_ydump (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_yrm(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-    char *dirname = argv[1];
-    if (yaffs_DumpDevStruct(dirname) != 0)
-	printf("yaffs_DumpDevStruct returning error when dumping path: , %s\n", dirname);
-    return 0;
+	char *name;
+
+	if (argc != 2) {
+		printf("Bad arguments: yrm name\n");
+		return -1;
+	}
+
+	name = argv[1];
+
+	cmd_yaffs_rm(name);
+
+	return 0;
+}
+
+int do_ymv(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	char *oldPath;
+	char *newPath;
+
+	if (argc != 3) {
+		printf("Bad arguments: ymv old_path new_path\n");
+		return -1;
+	}
+
+	oldPath = argv[1];
+	newPath = argv[2];
+
+	cmd_yaffs_mv(newPath, oldPath);
+
+	return 0;
 }
 
-U_BOOT_CMD(
-    ymount, 3,  0,  do_ymount,
-    "mount yaffs",
-    ""
-);
-
-U_BOOT_CMD(
-    yumount, 3,  0,  do_yumount,
-    "unmount yaffs",
-    ""
-);
-
-U_BOOT_CMD(
-    yls,    4,  0,  do_yls,
-    "yaffs ls",
-    "[-l] name"
-);
-
-U_BOOT_CMD(
-    yrd,    2,  0,  do_yrd,
-    "read file from yaffs",
-    "filename"
-);
-
-U_BOOT_CMD(
-    ywr,    4,  0,  do_ywr,
-    "write file to yaffs",
-    "filename value num_vlues"
-);
-
-U_BOOT_CMD(
-    yrdm,   3,  0,  do_yrdm,
-    "read file to memory from yaffs",
-    "filename offset"
-);
-
-U_BOOT_CMD(
-    ywrm,   4,  0,  do_ywrm,
-    "write file from memory to yaffs",
-    "filename offset size"
-);
-
-U_BOOT_CMD(
-    ymkdir, 2,  0,  do_ymkdir,
-    "YAFFS mkdir",
-    "dirname"
-);
-
-U_BOOT_CMD(
-    yrmdir, 2,  0,  do_yrmdir,
-    "YAFFS rmdir",
-    "dirname"
-);
-
-U_BOOT_CMD(
-    yrm,    2,  0,  do_yrm,
-    "YAFFS rm",
-    "path"
-);
-
-U_BOOT_CMD(
-    ymv,    4,  0,  do_ymv,
-    "YAFFS mv",
-    "oldPath newPath"
-);
-
-U_BOOT_CMD(
-    ydump,  2,  0,  do_ydump,
-    "YAFFS device struct",
-    "dirname"
-);
+U_BOOT_CMD(ytrace, 2, 0, do_ytrace,
+	   "show/set yaffs trace mask",
+	   "ytrace [new_mask]  show/set yaffs trace mask");
+
+U_BOOT_CMD(ydevls, 1, 0, do_ydevls,
+	   "list yaffs mount points", "list yaffs mount points");
+
+U_BOOT_CMD(ydevconfig, 5, 0, do_ydevconfig,
+	   "configure yaffs mount point",
+	   "ydevconfig mtpoint mtd_id start_block end_block   configures a yaffs2 mount point");
+
+U_BOOT_CMD(ymount, 2, 0, do_ymount,
+	   "mount yaffs", "ymount mtpoint  mounts a yaffs2 mount point");
+
+U_BOOT_CMD(yumount, 2, 0, do_yumount,
+	   "unmount yaffs", "yunmount mtpoint  unmounts a yaffs2 mount point");
+
+U_BOOT_CMD(yls, 3, 0, do_yls, "yaffs ls", "yls [-l] dirname");
+
+U_BOOT_CMD(yrd, 2, 0, do_yrd,
+	   "read file from yaffs", "yrd path   read file from yaffs");
+
+U_BOOT_CMD(ywr, 4, 0, do_ywr,
+	   "write file to yaffs",
+	   "ywr filename value num_vlues   write values to yaffs file");
+
+U_BOOT_CMD(yrdm, 3, 0, do_yrdm,
+	   "read file to memory from yaffs",
+	   "yrdm filename offset    reads yaffs file into memory");
+
+U_BOOT_CMD(ywrm, 4, 0, do_ywrm,
+	   "write file from memory to yaffs",
+	   "ywrm filename offset size  writes memory to yaffs file");
+
+U_BOOT_CMD(ymkdir, 2, 0, do_ymkdir,
+	   "YAFFS mkdir", "ymkdir dir    create a yaffs directory");
+
+U_BOOT_CMD(yrmdir, 2, 0, do_yrmdir,
+	   "YAFFS rmdir", "yrmdir dirname   removes a yaffs directory");
+
+U_BOOT_CMD(yrm, 2, 0, do_yrm, "YAFFS rm", "yrm path   removes a yaffs file");
+
+U_BOOT_CMD(ymv, 4, 0, do_ymv,
+	   "YAFFS mv",
+	   "ymv old_path new_path   moves/rename files within a yaffs mount point");
diff --git a/fs/yaffs2/Makefile b/fs/yaffs2/Makefile
index 904d646..31c12af 100644
--- a/fs/yaffs2/Makefile
+++ b/fs/yaffs2/Makefile
@@ -16,28 +16,43 @@
 #
 # $Id: Makefile,v 1.15 2007/07/18 19:40:38 charles Exp $
 
-#EXTRA_COMPILE_FLAGS = -DYAFFS_IGNORE_TAGS_ECC
 include $(TOPDIR)/config.mk
 
 LIB = $(obj)libyaffs2.o
 
 COBJS-$(CONFIG_YAFFS2) := \
-	yaffscfg.o yaffs_ecc.o yaffsfs.o yaffs_guts.o yaffs_packedtags1.o \
-	yaffs_tagscompat.o yaffs_packedtags2.o yaffs_tagsvalidity.o \
-	yaffs_nand.o yaffs_checkptrw.o yaffs_qsort.o yaffs_mtdif.o \
-	yaffs_mtdif2.o
+	yaffs_allocator.o yaffs_attribs.o yaffs_bitmap.o yaffs_uboot_glue.o\
+	yaffs_checkptrw.o yaffs_ecc.o yaffs_error.o \
+	yaffsfs.o yaffs_guts.o yaffs_hweight.o yaffs_nameval.o yaffs_nand.o\
+	yaffs_packedtags1.o yaffs_packedtags2.o yaffs_qsort.o \
+	yaffs_summary.o yaffs_tagscompat.o yaffs_verify.o yaffs_yaffs1.o \
+	yaffs_yaffs2.o yaffs_mtdif.o yaffs_mtdif2.o
 
 SRCS    := $(COBJS-y:.o=.c)
 OBJS    := $(addprefix $(obj),$(COBJS-y))
 
-# -DCONFIG_YAFFS_NO_YAFFS1
-CFLAGS +=    -DCONFIG_YAFFS_DIRECT -DCONFIG_YAFFS_SHORT_NAMES_IN_RAM -DCONFIG_YAFFS_YAFFS2 -DLINUX_VERSION_CODE=0x20622
+YCFLAGS =  -DCONFIG_YAFFS_DIRECT -DCONFIG_YAFFS_SHORT_NAMES_IN_RAM
+YCFLAGS += -DCONFIG_YAFFS_YAFFS2 -DNO_Y_INLINE
+YCFLAGS += -DCONFIG_YAFFS_PROVIDE_DEFS -DCONFIG_YAFFSFS_PROVIDE_VALUES
+
+CFLAGS += $(YCFLAGS)
+CPPFLAGS +=  $(YCFLAGS)
 
 all:  $(LIB)
 
-$(LIB): $(obj).depend $(OBJS)
+$(obj)libyaffs2.a: $(obj).depend $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+$(obj)libyaffs2.o: $(obj).depend $(OBJS)
 	$(call cmd_link_o_target, $(OBJS))
 
+.PHONY: clean distclean
+clean:
+	rm -f $(OBJS)
+
+distclean:  clean
+	rm -f $(LIB) core *.bak .depend
+
 #########################################################################
 
 # defines $(obj).depend target
diff --git a/fs/yaffs2/README-linux b/fs/yaffs2/README-linux
deleted file mode 100644
index 3851e36..0000000
--- a/fs/yaffs2/README-linux
+++ /dev/null
@@ -1,201 +0,0 @@
-Welcome to YAFFS, the first file system developed specifically for NAND flash.
-
-It is now YAFFS2 - original YAFFS (AYFFS1) only supports 512-byte page
-NAND and is now deprectated. YAFFS2 supports 512b page in 'YAFFS1
-compatibility' mode (CONFIG_YAFFS_YAFFS1) and 2K or larger page NAND
-in YAFFS2 mode (CONFIG_YAFFS_YAFFS2).
-
-
-A note on licencing
--------------------
-YAFFS is available under the GPL and via alternative licensing
-arrangements with Aleph One. If you're using YAFFS as a Linux kernel
-file system then it will be under the GPL. For use in other situations
-you should discuss licensing issues with Aleph One.
-
-
-Terminology
------------
-Page -  NAND addressable unit (normally 512b or 2Kbyte size) - can
-	be read, written, marked bad. Has associated OOB.
-Block - Eraseable unit. 64 Pages. (128K on 2K NAND, 32K on 512b NAND)
-OOB -   'spare area' of each page for ECC, bad block marked and YAFFS
-	tags. 16 bytes per 512b - 64 bytes for 2K page size.
-Chunk - Basic YAFFS addressable unit. Same size as Page.
-Object - YAFFS Object: File, Directory, Link, Device etc.
-
-YAFFS design
-------------
-
-YAFFS is a log-structured filesystem. It is designed particularly for
-NAND (as opposed to NOR) flash, to be flash-friendly, robust due to
-journalling, and to have low RAM and boot time overheads. File data is
-stored in 'chunks'. Chunks are the same size as NAND pages. Each page
-is marked with file id and chunk number. These marking 'tags' are
-stored in the OOB (or 'spare') region of the flash. The chunk number
-is determined by dividing the file position by the chunk size. Each
-chunk has a number of valid bytes, which equals the page size for all
-except the last chunk in a file.
-
-File 'headers' are stored as the first page in a file, marked as a
-different type to data pages. The same mechanism is used to store
-directories, device files, links etc. The first page describes which
-type of object it is.
-
-YAFFS2 never re-writes a page, because the spec of NAND chips does not
-allow it. (YAFFS1 used to mark a block 'deleted' in the OOB). Deletion
-is managed by moving deleted objects to the special, hidden 'unlinked'
-directory. These records are preserved until all the pages containing
-the object have been erased (We know when this happen by keeping a
-count of chunks remaining on the system for each object - when it
-reaches zero the object really is gone).
-
-When data in a file is overwritten, the relevant chunks are replaced
-by writing new pages to flash containing the new data but the same
-tags.
-
-Pages are also marked with a short (2 bit) serial number that
-increments each time the page at this position is incremented. The
-reason for this is that if power loss/crash/other act of demonic
-forces happens before the replaced page is marked as discarded, it is
-possible to have two pages with the same tags. The serial number is
-used to arbitrate.
-
-A block containing only discarded pages (termed a dirty block) is an
-obvious candidate for garbage collection. Otherwise valid pages can be
-copied off a block thus rendering the whole block discarded and ready
-for garbage collection.
-
-In theory you don't need to hold the file structure in RAM... you
-could just scan the whole flash looking for pages when you need them.
-In practice though you'd want better file access times than that! The
-mechanism proposed here is to have a list of __u16 page addresses
-associated with each file. Since there are 2^18 pages in a 128MB NAND,
-a __u16 is insufficient to uniquely identify a page but is does
-identify a group of 4 pages - a small enough region to search
-exhaustively. This mechanism is clearly expandable to larger NAND
-devices - within reason. The RAM overhead with this approach is approx
-2 bytes per page - 512kB of RAM for a whole 128MB NAND.
-
-Boot-time scanning to build the file structure lists only requires
-one pass reading NAND. If proper shutdowns happen the current RAM
-summary of the filesystem status is saved to flash, called
-'checkpointing'. This saves re-scanning the flash on startup, and gives
-huge boot/mount time savings.
-
-YAFFS regenerates its state by 'replaying the tape'  - i.e. by
-scanning the chunks in their allocation order (i.e. block sequence ID
-order), which is usually different form the media block order. Each
-block is still only read once - starting from the end of the media and
-working back.
-
-YAFFS tags in YAFFS1 mode:
-
-18-bit Object ID (2^18 files, i.e. > 260,000 files). File id 0- is not
-       valid and indicates a deleted page. File od 0x3ffff is also not valid.
-       Synonymous with inode.
-2-bit  serial number
-20-bit Chunk ID within file. Limit of 2^20 chunks/pages per file (i.e.
-       > 500MB max file size). Chunk ID 0 is the file header for the file.
-10-bit counter of the number of bytes used in the page.
-12 bit ECC on tags
-
-YAFFS tags in YAFFS2 mode:
-  4 bytes 32-bit chunk ID
-  4 bytes 32-bit object ID
-  2 bytes Number of data bytes in this chunk
-  4 bytes Sequence number for this block
-  3 bytes ECC on tags
- 12 bytes ECC on data (3 bytes per 256 bytes of data)
-
-
-Page allocation and garbage collection
-
-Pages are allocated sequentially from the currently selected block.
-When all the pages in the block are filled, another clean block is
-selected for allocation. At least two or three clean blocks are
-reserved for garbage collection purposes. If there are insufficient
-clean blocks available, then a dirty block ( ie one containing only
-discarded pages) is erased to free it up as a clean block. If no dirty
-blocks are available, then the dirtiest block is selected for garbage
-collection.
-
-Garbage collection is performed by copying the valid data pages into
-new data pages thus rendering all the pages in this block dirty and
-freeing it up for erasure. I also like the idea of selecting a block
-at random some small percentage of the time - thus reducing the chance
-of wear differences.
-
-YAFFS is single-threaded. Garbage-collection is done as a parasitic
-task of writing data. So each time some data is written, a bit of
-pending garbage collection is done. More pages are garbage-collected
-when free space is tight.
-
-
-Flash writing
-
-YAFFS only ever writes each page once, complying with the requirements
-of the most restricitve NAND devices.
-
-Wear levelling
-
-This comes as a side-effect of the block-allocation strategy. Data is
-always written on the next free block, so they are all used equally.
-Blocks containing data that is written but never erased will not get
-back into the free list, so wear is levelled over only blocks which
-are free or become free, not blocks which never change.
-
-
-
-Some helpful info
------------------
-
-Formatting a YAFFS device is simply done by erasing it.
-
-Making an initial filesystem can be tricky because YAFFS uses the OOB
-and thus the bytes that get written depend on the YAFFS data (tags),
-and the ECC bytes and bad block markers which are dictated by the
-hardware and/or the MTD subsystem. The data layout also depends on the
-device page size (512b or 2K). Because YAFFS is only responsible for
-some of the OOB data, generating a filesystem offline requires
-detailed knowledge of what the other parts (MTD and NAND
-driver/hardware) are going to do.
-
-To make a YAFFS filesystem you have 3 options:
-
-1) Boot the system with an empty NAND device mounted as YAFFS and copy
-   stuff on.
-
-2) Make a filesystem image offline, then boot the system and use
-   MTDutils to write an image to flash.
-
-3) Make a filesystem image offline and use some tool like a bootloader to
-   write it to flash.
-
-Option 1 avoids a lot of issues because all the parts
-(YAFFS/MTD/hardware) all take care of their own bits and (if you have
-put things together properly) it will 'just work'. YAFFS just needs to
-know how many bytes of the OOB it can use. However sometimes it is not
-practical.
-
-Option 2 lets MTD/hardware take care of the ECC so the filesystem
-image just had to know which bytes to use for YAFFS Tags.
-
-Option 3 is hardest as the image creator needs to know exactly what
-ECC bytes, endianness and algorithm to use as well as which bytes are
-available to YAFFS.
-
-mkyaffs2image creates an image suitable for option 3 for the
-particular case of yaffs2 on 2K page NAND with default MTD layout.
-
-mkyaffsimage creates an equivalent image for 512b page NAND (i.e.
-yaffs1 format).
-
-Bootloaders
------------
-
-A bootloader using YAFFS needs to know how MTD is laying out the OOB
-so that it can skip bad blocks.
-
-YAFFS Tracing
--------------
diff --git a/fs/yaffs2/devextras.h b/fs/yaffs2/devextras.h
deleted file mode 100644
index f6e5361..0000000
--- a/fs/yaffs2/devextras.h
+++ /dev/null
@@ -1,275 +0,0 @@
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2007 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-/*
- * This file is just holds extra declarations used during development.
- * Most of these are from kernel includes placed here so we can use them in
- * applications.
- *
- */
-
-#ifndef __EXTRAS_H__
-#define __EXTRAS_H__
-
-#if defined WIN32
-#define __inline__ __inline
-#define new newHack
-#endif
-
-/* XXX U-BOOT XXX */
-#if 1 /* !(defined __KERNEL__) || (defined WIN32) */
-
-/* User space defines */
-
-/* XXX U-BOOT XXX */
-#if 0
-typedef unsigned char __u8;
-typedef unsigned short __u16;
-typedef unsigned __u32;
-#endif
-
-#include <asm/types.h>
-
-/*
- * Simple doubly linked list implementation.
- *
- * Some of the internal functions ("__xxx") are useful when
- * manipulating whole lists rather than single entries, as
- * sometimes we already know the next/prev entries and we can
- * generate better code by using them directly rather than
- * using the generic single-entry routines.
- */
-
-#define prefetch(x) 1
-
-struct list_head {
-	struct list_head *next, *prev;
-};
-
-#define LIST_HEAD_INIT(name) { &(name), &(name) }
-
-#define LIST_HEAD(name) \
-	struct list_head name = LIST_HEAD_INIT(name)
-
-#define INIT_LIST_HEAD(ptr) do { \
-	(ptr)->next = (ptr); (ptr)->prev = (ptr); \
-} while (0)
-
-/*
- * Insert a new entry between two known consecutive entries.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static __inline__ void __list_add(struct list_head *new,
-				  struct list_head *prev,
-				  struct list_head *next)
-{
-	next->prev = new;
-	new->next = next;
-	new->prev = prev;
-	prev->next = new;
-}
-
-/**
- * list_add - add a new entry
- * @new: new entry to be added
- * @head: list head to add it after
- *
- * Insert a new entry after the specified head.
- * This is good for implementing stacks.
- */
-static __inline__ void list_add(struct list_head *new, struct list_head *head)
-{
-	__list_add(new, head, head->next);
-}
-
-/**
- * list_add_tail - add a new entry
- * @new: new entry to be added
- * @head: list head to add it before
- *
- * Insert a new entry before the specified head.
- * This is useful for implementing queues.
- */
-static __inline__ void list_add_tail(struct list_head *new,
-				     struct list_head *head)
-{
-	__list_add(new, head->prev, head);
-}
-
-/*
- * Delete a list entry by making the prev/next entries
- * point to each other.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static __inline__ void __list_del(struct list_head *prev,
-				  struct list_head *next)
-{
-	next->prev = prev;
-	prev->next = next;
-}
-
-/**
- * list_del - deletes entry from list.
- * @entry: the element to delete from the list.
- * Note: list_empty on entry does not return true after this, the entry is
- * in an undefined state.
- */
-static __inline__ void list_del(struct list_head *entry)
-{
-	__list_del(entry->prev, entry->next);
-}
-
-/**
- * list_del_init - deletes entry from list and reinitialize it.
- * @entry: the element to delete from the list.
- */
-static __inline__ void list_del_init(struct list_head *entry)
-{
-	__list_del(entry->prev, entry->next);
-	INIT_LIST_HEAD(entry);
-}
-
-/**
- * list_empty - tests whether a list is empty
- * @head: the list to test.
- */
-static __inline__ int list_empty(struct list_head *head)
-{
-	return head->next == head;
-}
-
-/**
- * list_splice - join two lists
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- */
-static __inline__ void list_splice(struct list_head *list,
-				   struct list_head *head)
-{
-	struct list_head *first = list->next;
-
-	if (first != list) {
-		struct list_head *last = list->prev;
-		struct list_head *at = head->next;
-
-		first->prev = head;
-		head->next = first;
-
-		last->next = at;
-		at->prev = last;
-	}
-}
-
-/**
- * list_entry - get the struct for this entry
- * @ptr:	the &struct list_head pointer.
- * @type:	the type of the struct this is embedded in.
- * @member:	the name of the list_struct within the struct.
- */
-#define list_entry(ptr, type, member) \
-	((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
-
-/**
- * list_for_each	-	iterate over a list
- * @pos:	the &struct list_head to use as a loop counter.
- * @head:	the head for your list.
- */
-#define list_for_each(pos, head) \
-	for (pos = (head)->next, prefetch(pos->next); pos != (head); \
-		pos = pos->next, prefetch(pos->next))
-
-/**
- * list_for_each_safe	-	iterate over a list safe against removal
- *                              of list entry
- * @pos:	the &struct list_head to use as a loop counter.
- * @n:		another &struct list_head to use as temporary storage
- * @head:	the head for your list.
- */
-#define list_for_each_safe(pos, n, head) \
-	for (pos = (head)->next, n = pos->next; pos != (head); \
-		pos = n, n = pos->next)
-
-/*
- * File types
- */
-#define DT_UNKNOWN	0
-#define DT_FIFO		1
-#define DT_CHR		2
-#define DT_DIR		4
-#define DT_BLK		6
-#define DT_REG		8
-#define DT_LNK		10
-#define DT_SOCK		12
-#define DT_WHT		14
-
-#ifndef WIN32
-/* XXX U-BOOT XXX */
-#if 0
-#include <sys/stat.h>
-#else
-#include "common.h"
-#endif
-#endif
-
-/*
- * Attribute flags.  These should be or-ed together to figure out what
- * has been changed!
- */
-#define ATTR_MODE	1
-#define ATTR_UID	2
-#define ATTR_GID	4
-#define ATTR_SIZE	8
-#define ATTR_ATIME	16
-#define ATTR_MTIME	32
-#define ATTR_CTIME	64
-#define ATTR_ATIME_SET	128
-#define ATTR_MTIME_SET	256
-#define ATTR_FORCE	512	/* Not a change, but a change it */
-#define ATTR_ATTR_FLAG	1024
-
-struct iattr {
-	unsigned int ia_valid;
-	unsigned ia_mode;
-	unsigned ia_uid;
-	unsigned ia_gid;
-	unsigned ia_size;
-	unsigned ia_atime;
-	unsigned ia_mtime;
-	unsigned ia_ctime;
-	unsigned int ia_attr_flags;
-};
-
-#define KERN_DEBUG
-
-#else
-
-#ifndef WIN32
-#include <linux/types.h>
-#include <linux/list.h>
-#include <linux/fs.h>
-#include <linux/stat.h>
-#endif
-
-#endif
-
-#if defined WIN32
-#undef new
-#endif
-
-#endif
diff --git a/fs/yaffs2/stdio.h b/fs/yaffs2/stdio.h
new file mode 100644
index 0000000..9f379d7
--- /dev/null
+++ b/fs/yaffs2/stdio.h
@@ -0,0 +1 @@
+/* Dummy header for u-boot */
diff --git a/fs/yaffs2/stdlib.h b/fs/yaffs2/stdlib.h
new file mode 100644
index 0000000..9f379d7
--- /dev/null
+++ b/fs/yaffs2/stdlib.h
@@ -0,0 +1 @@
+/* Dummy header for u-boot */
diff --git a/fs/yaffs2/string.h b/fs/yaffs2/string.h
new file mode 100644
index 0000000..6501fa7
--- /dev/null
+++ b/fs/yaffs2/string.h
@@ -0,0 +1,4 @@
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <common.h>
diff --git a/fs/yaffs2/yaffs_allocator.c b/fs/yaffs2/yaffs_allocator.c
new file mode 100644
index 0000000..611061f
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.c
@@ -0,0 +1,356 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+
+/*
+ * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks
+ * of approx 100 objects that are themn allocated singly.
+ * This is basically a simplified slab allocator.
+ *
+ * We don't use the Linux slab allocator because slab does not allow
+ * us to dump all the objects in one hit when we do a umount and tear
+ * down  all the tnodes and objects. slab requires that we first free
+ * the individual objects.
+ *
+ * Once yaffs has been mainlined I shall try to motivate for a change
+ * to slab to provide the extra features we need here.
+ */
+
+struct yaffs_tnode_list {
+	struct yaffs_tnode_list *next;
+	struct yaffs_tnode *tnodes;
+};
+
+struct yaffs_obj_list {
+	struct yaffs_obj_list *next;
+	struct yaffs_obj *objects;
+};
+
+struct yaffs_allocator {
+	int n_tnodes_created;
+	struct yaffs_tnode *free_tnodes;
+	int n_free_tnodes;
+	struct yaffs_tnode_list *alloc_tnode_list;
+
+	int n_obj_created;
+	struct list_head free_objs;
+	int n_free_objects;
+
+	struct yaffs_obj_list *allocated_obj_list;
+};
+
+static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	struct yaffs_tnode_list *tmp;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	while (allocator->alloc_tnode_list) {
+		tmp = allocator->alloc_tnode_list->next;
+
+		kfree(allocator->alloc_tnode_list->tnodes);
+		kfree(allocator->alloc_tnode_list);
+		allocator->alloc_tnode_list = tmp;
+	}
+
+	allocator->free_tnodes = NULL;
+	allocator->n_free_tnodes = 0;
+	allocator->n_tnodes_created = 0;
+}
+
+static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	allocator->alloc_tnode_list = NULL;
+	allocator->free_tnodes = NULL;
+	allocator->n_free_tnodes = 0;
+	allocator->n_tnodes_created = 0;
+}
+
+static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	int i;
+	struct yaffs_tnode *new_tnodes;
+	u8 *mem;
+	struct yaffs_tnode *curr;
+	struct yaffs_tnode *next;
+	struct yaffs_tnode_list *tnl;
+
+	if (!allocator) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	if (n_tnodes < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
+	mem = (u8 *) new_tnodes;
+
+	if (!new_tnodes) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"yaffs: Could not allocate Tnodes");
+		return YAFFS_FAIL;
+	}
+
+	/* New hookup for wide tnodes */
+	for (i = 0; i < n_tnodes - 1; i++) {
+		curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
+		next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
+		curr->internal[0] = next;
+	}
+
+	curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
+	curr->internal[0] = allocator->free_tnodes;
+	allocator->free_tnodes = (struct yaffs_tnode *)mem;
+
+	allocator->n_free_tnodes += n_tnodes;
+	allocator->n_tnodes_created += n_tnodes;
+
+	/* Now add this bunch of tnodes to a list for freeing up.
+	 * NB If we can't add this to the management list it isn't fatal
+	 * but it just means we can't free this bunch of tnodes later.
+	 */
+	tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
+	if (!tnl) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Could not add tnodes to management list");
+		return YAFFS_FAIL;
+	} else {
+		tnl->tnodes = new_tnodes;
+		tnl->next = allocator->alloc_tnode_list;
+		allocator->alloc_tnode_list = tnl;
+	}
+
+	yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added");
+
+	return YAFFS_OK;
+}
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	struct yaffs_tnode *tn = NULL;
+
+	if (!allocator) {
+		BUG();
+		return NULL;
+	}
+
+	/* If there are none left make more */
+	if (!allocator->free_tnodes)
+		yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
+
+	if (allocator->free_tnodes) {
+		tn = allocator->free_tnodes;
+		allocator->free_tnodes = allocator->free_tnodes->internal[0];
+		allocator->n_free_tnodes--;
+	}
+
+	return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	if (tn) {
+		tn->internal[0] = allocator->free_tnodes;
+		allocator->free_tnodes = tn;
+		allocator->n_free_tnodes++;
+	}
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
+
+/*--------------- yaffs_obj alloaction ------------------------
+ *
+ * Free yaffs_objs are stored in a list using obj->siblings.
+ * The blocks of allocated objects are stored in a linked list.
+ */
+
+static void yaffs_init_raw_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	allocator->allocated_obj_list = NULL;
+	INIT_LIST_HEAD(&allocator->free_objs);
+	allocator->n_free_objects = 0;
+}
+
+static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+	struct yaffs_obj_list *tmp;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	while (allocator->allocated_obj_list) {
+		tmp = allocator->allocated_obj_list->next;
+		kfree(allocator->allocated_obj_list->objects);
+		kfree(allocator->allocated_obj_list);
+		allocator->allocated_obj_list = tmp;
+	}
+
+	INIT_LIST_HEAD(&allocator->free_objs);
+	allocator->n_free_objects = 0;
+	allocator->n_obj_created = 0;
+}
+
+static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+	int i;
+	struct yaffs_obj *new_objs;
+	struct yaffs_obj_list *list;
+
+	if (!allocator) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	if (n_obj < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
+	list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
+
+	if (!new_objs || !list) {
+		kfree(new_objs);
+		new_objs = NULL;
+		kfree(list);
+		list = NULL;
+		yaffs_trace(YAFFS_TRACE_ALLOCATE,
+			"Could not allocate more objects");
+		return YAFFS_FAIL;
+	}
+
+	/* Hook them into the free list */
+	for (i = 0; i < n_obj; i++)
+		list_add(&new_objs[i].siblings, &allocator->free_objs);
+
+	allocator->n_free_objects += n_obj;
+	allocator->n_obj_created += n_obj;
+
+	/* Now add this bunch of Objects to a list for freeing up. */
+
+	list->objects = new_objs;
+	list->next = allocator->allocated_obj_list;
+	allocator->allocated_obj_list = list;
+
+	return YAFFS_OK;
+}
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj = NULL;
+	struct list_head *lh;
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return obj;
+	}
+
+	/* If there are none left make more */
+	if (list_empty(&allocator->free_objs))
+		yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+	if (!list_empty(&allocator->free_objs)) {
+		lh = allocator->free_objs.next;
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		list_del_init(lh);
+		allocator->n_free_objects--;
+	}
+
+	return obj;
+}
+
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	/* Link into the free list. */
+	list_add(&obj->siblings, &allocator->free_objs);
+	allocator->n_free_objects++;
+}
+
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+
+	if (!dev->allocator) {
+		BUG();
+		return;
+	}
+
+	yaffs_deinit_raw_tnodes(dev);
+	yaffs_deinit_raw_objs(dev);
+	kfree(dev->allocator);
+	dev->allocator = NULL;
+}
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator;
+
+	if (dev->allocator) {
+		BUG();
+		return;
+	}
+
+	allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
+	if (allocator) {
+		dev->allocator = allocator;
+		yaffs_init_raw_tnodes(dev);
+		yaffs_init_raw_objs(dev);
+	}
+}
diff --git a/fs/yaffs2/yaffs_allocator.h b/fs/yaffs2/yaffs_allocator.h
new file mode 100644
index 0000000..a8cc322
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.h
@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ALLOCATOR_H__
+#define __YAFFS_ALLOCATOR_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev);
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev);
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn);
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev);
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj);
+
+#endif
diff --git a/fs/yaffs2/yaffs_attribs.c b/fs/yaffs2/yaffs_attribs.c
new file mode 100644
index 0000000..6966426
--- /dev/null
+++ b/fs/yaffs2/yaffs_attribs.c
@@ -0,0 +1,152 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_attribs.h"
+
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
+{
+	obj->yst_uid = oh->yst_uid;
+	obj->yst_gid = oh->yst_gid;
+	obj->yst_atime = oh->yst_atime;
+	obj->yst_mtime = oh->yst_mtime;
+	obj->yst_ctime = oh->yst_ctime;
+	obj->yst_rdev = oh->yst_rdev;
+}
+
+
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
+{
+#ifdef CONFIG_YAFFS_WINCE
+		oh->win_atime[0] = obj->win_atime[0];
+		oh->win_ctime[0] = obj->win_ctime[0];
+		oh->win_mtime[0] = obj->win_mtime[0];
+		oh->win_atime[1] = obj->win_atime[1];
+		oh->win_ctime[1] = obj->win_ctime[1];
+		oh->win_mtime[1] = obj->win_mtime[1];
+#else
+		oh->yst_uid = obj->yst_uid;
+		oh->yst_gid = obj->yst_gid;
+		oh->yst_atime = obj->yst_atime;
+		oh->yst_mtime = obj->yst_mtime;
+		oh->yst_ctime = obj->yst_ctime;
+		oh->yst_rdev = obj->yst_rdev;
+#endif
+
+}
+
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
+{
+
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_win_file_time_now(obj->win_atime);
+		obj->win_ctime[0] = obj->win_mtime[0] = obj->win_atime[0];
+		obj->win_ctime[1] = obj->win_mtime[1] = obj->win_atime[1];
+
+#else
+	yaffs_load_current_time(obj, 1, 1);
+	obj->yst_rdev = rdev;
+	obj->yst_uid = uid;
+	obj->yst_gid = gid;
+#endif
+}
+
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
+{
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_win_file_time_now(the_obj->win_atime);
+		the_obj->win_ctime[0] = the_obj->win_mtime[0] =
+		    the_obj->win_atime[0];
+		the_obj->win_ctime[1] = the_obj->win_mtime[1] =
+		    the_obj->win_atime[1];
+
+#else
+
+	obj->yst_mtime = Y_CURRENT_TIME;
+	if (do_a)
+		obj->yst_atime = obj->yst_atime;
+	if (do_c)
+		obj->yst_ctime = obj->yst_atime;
+#endif
+}
+
+loff_t yaffs_get_file_size(struct yaffs_obj *obj)
+{
+	YCHAR *alias = NULL;
+	obj = yaffs_get_equivalent_obj(obj);
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return obj->variant.file_variant.file_size;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = obj->variant.symlink_variant.alias;
+		if (!alias)
+			return 0;
+		return yaffs_strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
+	default:
+		return 0;
+	}
+}
+
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+	unsigned int valid = attr->ia_valid;
+
+	if (valid & ATTR_MODE)
+		obj->yst_mode = attr->ia_mode;
+	if (valid & ATTR_UID)
+		obj->yst_uid = attr->ia_uid;
+	if (valid & ATTR_GID)
+		obj->yst_gid = attr->ia_gid;
+
+	if (valid & ATTR_ATIME)
+		obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+	if (valid & ATTR_CTIME)
+		obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+	if (valid & ATTR_MTIME)
+		obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+	if (valid & ATTR_SIZE)
+		yaffs_resize_file(obj, attr->ia_size);
+
+	yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+	return YAFFS_OK;
+
+}
+
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+	unsigned int valid = 0;
+
+	attr->ia_mode = obj->yst_mode;
+	valid |= ATTR_MODE;
+	attr->ia_uid = obj->yst_uid;
+	valid |= ATTR_UID;
+	attr->ia_gid = obj->yst_gid;
+	valid |= ATTR_GID;
+
+	Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
+	valid |= ATTR_ATIME;
+	Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
+	valid |= ATTR_CTIME;
+	Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
+	valid |= ATTR_MTIME;
+
+	attr->ia_size = yaffs_get_file_size(obj);
+	valid |= ATTR_SIZE;
+
+	attr->ia_valid = valid;
+
+	return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_attribs.h b/fs/yaffs2/yaffs_attribs.h
new file mode 100644
index 0000000..5b21b08
--- /dev/null
+++ b/fs/yaffs2/yaffs_attribs.h
@@ -0,0 +1,28 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ATTRIBS_H__
+#define __YAFFS_ATTRIBS_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh);
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj);
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev);
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c);
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
+
+#endif
diff --git a/fs/yaffs2/yaffs_bitmap.c b/fs/yaffs2/yaffs_bitmap.c
new file mode 100644
index 0000000..4440e93
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.c
@@ -0,0 +1,97 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_bitmap.h"
+#include "yaffs_trace.h"
+/*
+ * Chunk bitmap manipulations
+ */
+
+static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
+{
+	if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"BlockBits block %d is not valid",
+			blk);
+		BUG();
+	}
+	return dev->chunk_bits +
+	    (dev->chunk_bit_stride * (blk - dev->internal_start_block));
+}
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
+{
+	if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
+	    chunk < 0 || chunk >= dev->param.chunks_per_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Chunk Id (%d:%d) invalid",
+			blk, chunk);
+		BUG();
+	}
+}
+
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	memset(blk_bits, 0, dev->chunk_bit_stride);
+}
+
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	blk_bits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+	int i;
+
+	for (i = 0; i < dev->chunk_bit_stride; i++) {
+		if (*blk_bits)
+			return 1;
+		blk_bits++;
+	}
+	return 0;
+}
+
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+	int i;
+	int n = 0;
+
+	for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
+		n += hweight8(*blk_bits);
+
+	return n;
+}
diff --git a/fs/yaffs2/yaffs_bitmap.h b/fs/yaffs2/yaffs_bitmap.h
new file mode 100644
index 0000000..e26b37d
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.h
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+#ifndef __YAFFS_BITMAP_H__
+#define __YAFFS_BITMAP_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk);
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk);
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk);
+
+#endif
diff --git a/fs/yaffs2/yaffs_checkptrw.c b/fs/yaffs2/yaffs_checkptrw.c
index 230f78f..997a618 100644
--- a/fs/yaffs2/yaffs_checkptrw.c
+++ b/fs/yaffs2/yaffs_checkptrw.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,395 +11,398 @@
  * published by the Free Software Foundation.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-#include <malloc.h>
-
-const char *yaffs_checkptrw_c_version =
-    "$Id: yaffs_checkptrw.c,v 1.14 2007/05/15 20:07:40 charles Exp $";
-
-
 #include "yaffs_checkptrw.h"
+#include "yaffs_getblockinfo.h"
 
-
-static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
 {
+	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
 
-	int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpt blocks_avail = %d", blocks_avail);
 
-	T(YAFFS_TRACE_CHECKPOINT,
-		(TSTR("checkpt blocks available = %d" TENDSTR),
-		blocksAvailable));
-
-
-	return (blocksAvailable <= 0) ? 0 : 1;
+	return (blocks_avail <= 0) ? 0 : 1;
 }
 
-
-static int yaffs_CheckpointErase(yaffs_Device *dev)
+static int yaffs_checkpt_erase(struct yaffs_dev *dev)
 {
-
 	int i;
 
-
-	if(!dev->eraseBlockInNAND)
+	if (!dev->param.erase_fn)
 		return 0;
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
-		dev->internalStartBlock,dev->internalEndBlock));
-
-	for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
-		if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
-			T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
-			if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
-				bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
-				dev->nErasedBlocks++;
-				dev->nFreeChunks += dev->nChunksPerBlock;
-			}
-			else {
-				dev->markNANDBlockBad(dev,i);
-				bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checking blocks %d to %d",
+		dev->internal_start_block, dev->internal_end_block);
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"erasing checkpt block %d", i);
+
+			dev->n_erasures++;
+
+			if (dev->param.
+			    erase_fn(dev,
+				     i - dev->block_offset /* realign */)) {
+				bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+				dev->n_erased_blocks++;
+				dev->n_free_chunks +=
+				    dev->param.chunks_per_block;
+			} else {
+				dev->param.bad_block_fn(dev, i);
+				bi->block_state = YAFFS_BLOCK_STATE_DEAD;
 			}
 		}
 	}
 
-	dev->blocksInCheckpoint = 0;
+	dev->blocks_in_checkpt = 0;
 
 	return 1;
 }
 
-
-static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
+static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
 {
-	int  i;
-	int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
-	T(YAFFS_TRACE_CHECKPOINT,
-		(TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
-		dev->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
-
-	if(dev->checkpointNextBlock >= 0 &&
-	   dev->checkpointNextBlock <= dev->internalEndBlock &&
-	   blocksAvailable > 0){
-
-		for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
-			yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
-			if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
-				dev->checkpointNextBlock = i + 1;
-				dev->checkpointCurrentBlock = i;
-				T(YAFFS_TRACE_CHECKPOINT,(TSTR("allocating checkpt block %d"TENDSTR),i));
+	int i;
+	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"allocating checkpt block: erased %d reserved %d avail %d next %d ",
+		dev->n_erased_blocks, dev->param.n_reserved_blocks,
+		blocks_avail, dev->checkpt_next_block);
+
+	if (dev->checkpt_next_block >= 0 &&
+	    dev->checkpt_next_block <= dev->internal_end_block &&
+	    blocks_avail > 0) {
+
+		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+		     i++) {
+			struct yaffs_block_info *bi =
+			    yaffs_get_block_info(dev, i);
+			if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+				dev->checkpt_next_block = i + 1;
+				dev->checkpt_cur_block = i;
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+					"allocating checkpt block %d", i);
 				return;
 			}
 		}
 	}
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("out of checkpt blocks"TENDSTR)));
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
 
-	dev->checkpointNextBlock = -1;
-	dev->checkpointCurrentBlock = -1;
+	dev->checkpt_next_block = -1;
+	dev->checkpt_cur_block = -1;
 }
 
-static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
+static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
 {
-	int  i;
-	yaffs_ExtendedTags tags;
-
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: start:  blocks %d next %d" TENDSTR),
-		dev->blocksInCheckpoint, dev->checkpointNextBlock));
-
-	if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
-		for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
-			int chunk = i * dev->nChunksPerBlock;
-			int realignedChunk = chunk - dev->chunkOffset;
-
-			dev->readChunkWithTagsFromNAND(dev,realignedChunk,NULL,&tags);
-			T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
-				i, tags.objectId,tags.sequenceNumber,tags.eccResult));
-
-			if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
+	int i;
+	struct yaffs_ext_tags tags;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"find next checkpt block: start:  blocks %d next %d",
+		dev->blocks_in_checkpt, dev->checkpt_next_block);
+
+	if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
+		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+		     i++) {
+			int chunk = i * dev->param.chunks_per_block;
+			int realigned_chunk = chunk - dev->chunk_offset;
+
+			dev->param.read_chunk_tags_fn(dev, realigned_chunk,
+						      NULL, &tags);
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"find next checkpt block: search: block %d oid %d seq %d eccr %d",
+				i, tags.obj_id, tags.seq_number,
+				tags.ecc_result);
+
+			if (tags.seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA) {
 				/* Right kind of block */
-				dev->checkpointNextBlock = tags.objectId;
-				dev->checkpointCurrentBlock = i;
-				dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
-				dev->blocksInCheckpoint++;
-				T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
+				dev->checkpt_next_block = tags.obj_id;
+				dev->checkpt_cur_block = i;
+				dev->checkpt_block_list[dev->
+							blocks_in_checkpt] = i;
+				dev->blocks_in_checkpt++;
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+					"found checkpt block %d", i);
 				return;
 			}
 		}
 
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
 
-	dev->checkpointNextBlock = -1;
-	dev->checkpointCurrentBlock = -1;
+	dev->checkpt_next_block = -1;
+	dev->checkpt_cur_block = -1;
 }
 
-
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
 {
+	int i;
+
+	dev->checkpt_open_write = writing;
 
 	/* Got the functions we need? */
-	if (!dev->writeChunkWithTagsToNAND ||
-	    !dev->readChunkWithTagsFromNAND ||
-	    !dev->eraseBlockInNAND ||
-	    !dev->markNANDBlockBad)
+	if (!dev->param.write_chunk_tags_fn ||
+	    !dev->param.read_chunk_tags_fn ||
+	    !dev->param.erase_fn || !dev->param.bad_block_fn)
 		return 0;
 
-	if(forWriting && !yaffs_CheckpointSpaceOk(dev))
+	if (writing && !yaffs2_checkpt_space_ok(dev))
 		return 0;
 
-	if(!dev->checkpointBuffer)
-		dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
-	if(!dev->checkpointBuffer)
+	if (!dev->checkpt_buffer)
+		dev->checkpt_buffer =
+		    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+	if (!dev->checkpt_buffer)
 		return 0;
 
-
-	dev->checkpointPageSequence = 0;
-
-	dev->checkpointOpenForWrite = forWriting;
-
-	dev->checkpointByteCount = 0;
-	dev->checkpointSum = 0;
-	dev->checkpointXor = 0;
-	dev->checkpointCurrentBlock = -1;
-	dev->checkpointCurrentChunk = -1;
-	dev->checkpointNextBlock = dev->internalStartBlock;
+	dev->checkpt_page_seq = 0;
+	dev->checkpt_byte_count = 0;
+	dev->checkpt_sum = 0;
+	dev->checkpt_xor = 0;
+	dev->checkpt_cur_block = -1;
+	dev->checkpt_cur_chunk = -1;
+	dev->checkpt_next_block = dev->internal_start_block;
 
 	/* Erase all the blocks in the checkpoint area */
-	if(forWriting){
-		memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
-		dev->checkpointByteOffset = 0;
-		return yaffs_CheckpointErase(dev);
+	if (writing) {
+		memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
+		dev->checkpt_byte_offs = 0;
+		return yaffs_checkpt_erase(dev);
+	}
 
+	/* Set to a value that will kick off a read */
+	dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
+	/* A checkpoint block list of 1 checkpoint block per 16 block is
+	 * (hopefully) going to be way more than we need */
+	dev->blocks_in_checkpt = 0;
+	dev->checkpt_max_blocks =
+	    (dev->internal_end_block - dev->internal_start_block) / 16 + 2;
+	dev->checkpt_block_list =
+	    kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
+
+	if (!dev->checkpt_block_list)
+		return 0;
 
-	} else {
-		int i;
-		/* Set to a value that will kick off a read */
-		dev->checkpointByteOffset = dev->nDataBytesPerChunk;
-		/* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
-		 * going to be way more than we need */
-		dev->blocksInCheckpoint = 0;
-		dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
-		dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
-		for(i = 0; i < dev->checkpointMaxBlocks; i++)
-			dev->checkpointBlockList[i] = -1;
-	}
+	for (i = 0; i < dev->checkpt_max_blocks; i++)
+		dev->checkpt_block_list[i] = -1;
 
 	return 1;
 }
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
 {
-	__u32 compositeSum;
-	compositeSum =  (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
-	*sum = compositeSum;
+	u32 composite_sum;
+
+	composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);
+	*sum = composite_sum;
 	return 1;
 }
 
-static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
+static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
 {
-
 	int chunk;
-	int realignedChunk;
-
-	yaffs_ExtendedTags tags;
+	int realigned_chunk;
+	struct yaffs_ext_tags tags;
 
-	if(dev->checkpointCurrentBlock < 0){
-		yaffs_CheckpointFindNextErasedBlock(dev);
-		dev->checkpointCurrentChunk = 0;
+	if (dev->checkpt_cur_block < 0) {
+		yaffs2_checkpt_find_erased_block(dev);
+		dev->checkpt_cur_chunk = 0;
 	}
 
-	if(dev->checkpointCurrentBlock < 0)
+	if (dev->checkpt_cur_block < 0)
 		return 0;
 
-	tags.chunkDeleted = 0;
-	tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
-	tags.chunkId = dev->checkpointPageSequence + 1;
-	tags.sequenceNumber =  YAFFS_SEQUENCE_CHECKPOINT_DATA;
-	tags.byteCount = dev->nDataBytesPerChunk;
-	if(dev->checkpointCurrentChunk == 0){
+	tags.is_deleted = 0;
+	tags.obj_id = dev->checkpt_next_block;	/* Hint to next place to look */
+	tags.chunk_id = dev->checkpt_page_seq + 1;
+	tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
+	tags.n_bytes = dev->data_bytes_per_chunk;
+	if (dev->checkpt_cur_chunk == 0) {
 		/* First chunk we write for the block? Set block state to
 		   checkpoint */
-		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
-		bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
-		dev->blocksInCheckpoint++;
+		struct yaffs_block_info *bi =
+		    yaffs_get_block_info(dev, dev->checkpt_cur_block);
+		bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		dev->blocks_in_checkpt++;
 	}
 
-	chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
+	chunk =
+	    dev->checkpt_cur_block * dev->param.chunks_per_block +
+	    dev->checkpt_cur_chunk;
 
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
+		chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
+		tags.obj_id, tags.chunk_id);
 
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
-		chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
+	realigned_chunk = chunk - dev->chunk_offset;
 
-	realignedChunk = chunk - dev->chunkOffset;
+	dev->n_page_writes++;
 
-	dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
-	dev->checkpointByteOffset = 0;
-	dev->checkpointPageSequence++;
-	dev->checkpointCurrentChunk++;
-	if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
-		dev->checkpointCurrentChunk = 0;
-		dev->checkpointCurrentBlock = -1;
+	dev->param.write_chunk_tags_fn(dev, realigned_chunk,
+				       dev->checkpt_buffer, &tags);
+	dev->checkpt_byte_offs = 0;
+	dev->checkpt_page_seq++;
+	dev->checkpt_cur_chunk++;
+	if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
+		dev->checkpt_cur_chunk = 0;
+		dev->checkpt_cur_block = -1;
 	}
-	memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
+	memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
 
 	return 1;
 }
 
-
-int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)
 {
-	int i=0;
+	int i = 0;
 	int ok = 1;
+	u8 *data_bytes = (u8 *) data;
 
-
-	__u8 * dataBytes = (__u8 *)data;
-
-
-
-	if(!dev->checkpointBuffer)
+	if (!dev->checkpt_buffer)
 		return 0;
 
-	if(!dev->checkpointOpenForWrite)
+	if (!dev->checkpt_open_write)
 		return -1;
 
-	while(i < nBytes && ok) {
-
-
-
-		dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
-		dev->checkpointSum += *dataBytes;
-		dev->checkpointXor ^= *dataBytes;
+	while (i < n_bytes && ok) {
+		dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
+		dev->checkpt_sum += *data_bytes;
+		dev->checkpt_xor ^= *data_bytes;
 
-		dev->checkpointByteOffset++;
+		dev->checkpt_byte_offs++;
 		i++;
-		dataBytes++;
-		dev->checkpointByteCount++;
-
-
-		if(dev->checkpointByteOffset < 0 ||
-		   dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
-			ok = yaffs_CheckpointFlushBuffer(dev);
+		data_bytes++;
+		dev->checkpt_byte_count++;
 
+		if (dev->checkpt_byte_offs < 0 ||
+		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
+			ok = yaffs2_checkpt_flush_buffer(dev);
 	}
 
-	return 	i;
+	return i;
 }
 
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
 {
-	int i=0;
+	int i = 0;
 	int ok = 1;
-	yaffs_ExtendedTags tags;
-
-
+	struct yaffs_ext_tags tags;
 	int chunk;
-	int realignedChunk;
+	int realigned_chunk;
+	u8 *data_bytes = (u8 *) data;
 
-	__u8 *dataBytes = (__u8 *)data;
-
-	if(!dev->checkpointBuffer)
+	if (!dev->checkpt_buffer)
 		return 0;
 
-	if(dev->checkpointOpenForWrite)
+	if (dev->checkpt_open_write)
 		return -1;
 
-	while(i < nBytes && ok) {
-
+	while (i < n_bytes && ok) {
 
-		if(dev->checkpointByteOffset < 0 ||
-		   dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
+		if (dev->checkpt_byte_offs < 0 ||
+		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
 
-		   	if(dev->checkpointCurrentBlock < 0){
-				yaffs_CheckpointFindNextCheckpointBlock(dev);
-				dev->checkpointCurrentChunk = 0;
+			if (dev->checkpt_cur_block < 0) {
+				yaffs2_checkpt_find_block(dev);
+				dev->checkpt_cur_chunk = 0;
 			}
 
-			if(dev->checkpointCurrentBlock < 0)
+			if (dev->checkpt_cur_block < 0) {
 				ok = 0;
-			else {
+				break;
+			}
 
-				chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
-				          dev->checkpointCurrentChunk;
+			chunk = dev->checkpt_cur_block *
+			    dev->param.chunks_per_block +
+			    dev->checkpt_cur_chunk;
 
-				realignedChunk = chunk - dev->chunkOffset;
+			realigned_chunk = chunk - dev->chunk_offset;
+			dev->n_page_reads++;
 
-	   			/* read in the next chunk */
-	   			/* printf("read checkpoint page %d\n",dev->checkpointPage); */
-				dev->readChunkWithTagsFromNAND(dev, realignedChunk,
-							       dev->checkpointBuffer,
-							      &tags);
+			/* read in the next chunk */
+			dev->param.read_chunk_tags_fn(dev,
+						realigned_chunk,
+						dev->checkpt_buffer,
+						&tags);
 
-				if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
-				   tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
-				   ok = 0;
+			if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||
+			    tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
+			    tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) {
+				ok = 0;
+				break;
+			}
 
-				dev->checkpointByteOffset = 0;
-				dev->checkpointPageSequence++;
-				dev->checkpointCurrentChunk++;
+			dev->checkpt_byte_offs = 0;
+			dev->checkpt_page_seq++;
+			dev->checkpt_cur_chunk++;
 
-				if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
-					dev->checkpointCurrentBlock = -1;
-			}
+			if (dev->checkpt_cur_chunk >=
+					dev->param.chunks_per_block)
+				dev->checkpt_cur_block = -1;
 		}
 
-		if(ok){
-			*dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
-			dev->checkpointSum += *dataBytes;
-			dev->checkpointXor ^= *dataBytes;
-			dev->checkpointByteOffset++;
-			i++;
-			dataBytes++;
-			dev->checkpointByteCount++;
-		}
+		*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
+		dev->checkpt_sum += *data_bytes;
+		dev->checkpt_xor ^= *data_bytes;
+		dev->checkpt_byte_offs++;
+		i++;
+		data_bytes++;
+		dev->checkpt_byte_count++;
 	}
 
-	return 	i;
+	return i;
 }
 
-int yaffs_CheckpointClose(yaffs_Device *dev)
+int yaffs_checkpt_close(struct yaffs_dev *dev)
 {
+	int i;
 
-	if(dev->checkpointOpenForWrite){
-		if(dev->checkpointByteOffset != 0)
-			yaffs_CheckpointFlushBuffer(dev);
-	} else {
-		int i;
-		for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
-			yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
-			if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
-				bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
-			else {
-				// Todo this looks odd...
-			}
+	if (dev->checkpt_open_write) {
+		if (dev->checkpt_byte_offs != 0)
+			yaffs2_checkpt_flush_buffer(dev);
+	} else if (dev->checkpt_block_list) {
+		for (i = 0;
+		     i < dev->blocks_in_checkpt &&
+		     dev->checkpt_block_list[i] >= 0; i++) {
+			int blk = dev->checkpt_block_list[i];
+			struct yaffs_block_info *bi = NULL;
+
+			if (dev->internal_start_block <= blk &&
+			    blk <= dev->internal_end_block)
+				bi = yaffs_get_block_info(dev, blk);
+			if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
+				bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
 		}
-		YFREE(dev->checkpointBlockList);
-		dev->checkpointBlockList = NULL;
+		kfree(dev->checkpt_block_list);
+		dev->checkpt_block_list = NULL;
 	}
 
-	dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
-	dev->nErasedBlocks -= dev->blocksInCheckpoint;
+	dev->n_free_chunks -=
+		dev->blocks_in_checkpt * dev->param.chunks_per_block;
+	dev->n_erased_blocks -= dev->blocks_in_checkpt;
 
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d",
+		dev->checkpt_byte_count);
 
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
-			dev->checkpointByteCount));
-
-	if(dev->checkpointBuffer){
+	if (dev->checkpt_buffer) {
 		/* free the buffer */
-		YFREE(dev->checkpointBuffer);
-		dev->checkpointBuffer = NULL;
+		kfree(dev->checkpt_buffer);
+		dev->checkpt_buffer = NULL;
 		return 1;
-	}
-	else
+	} else {
 		return 0;
-
+	}
 }
 
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
 {
-	/* Erase the first checksum block */
-
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
+	/* Erase the checkpoint data */
 
-	if(!yaffs_CheckpointSpaceOk(dev))
-		return 0;
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpoint invalidate of %d blocks",
+		dev->blocks_in_checkpt);
 
-	return yaffs_CheckpointErase(dev);
+	return yaffs_checkpt_erase(dev);
 }
diff --git a/fs/yaffs2/yaffs_checkptrw.h b/fs/yaffs2/yaffs_checkptrw.h
index e59d151..cdbaba7 100644
--- a/fs/yaffs2/yaffs_checkptrw.h
+++ b/fs/yaffs2/yaffs_checkptrw.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -18,17 +18,16 @@
 
 #include "yaffs_guts.h"
 
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting);
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing);
 
-int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes);
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes);
 
-int yaffs_CheckpointRead(yaffs_Device *dev,void *data, int nBytes);
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes);
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum);
 
-int yaffs_CheckpointClose(yaffs_Device *dev);
-
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
+int yaffs_checkpt_close(struct yaffs_dev *dev);
 
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev);
 
 #endif
diff --git a/fs/yaffs2/yaffs_ecc.c b/fs/yaffs2/yaffs_ecc.c
index 1b4a05d..9294107 100644
--- a/fs/yaffs2/yaffs_ecc.c
+++ b/fs/yaffs2/yaffs_ecc.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -16,28 +16,22 @@
  *
  * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
  * The two unused bit are set to 1.
- * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
- * blocks are used on a 512-byte NAND page.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two
+ * such ECC blocks are used on a 512-byte NAND page.
  *
  */
 
+#include "yportenv.h"
+
+#include "yaffs_ecc.h"
+
 /* Table generated by gen-ecc.c
  * Using a table means we do not have to calculate p1..p4 and p1'..p4'
  * for each byte of data. These are instead provided in a table in bits7..2.
- * Bit 0 of each entry indicates whether the entry has an odd or even parity, and therefore
- * this bytes influence on the line parity.
+ * Bit 0 of each entry indicates whether the entry has an odd or even parity,
+ * and therefore this bytes influence on the line parity.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-
-const char *yaffs_ecc_c_version =
-    "$Id: yaffs_ecc.c,v 1.9 2007/02/14 01:09:06 wookey Exp $";
-
-#include "yportenv.h"
-
-#include "yaffs_ecc.h"
-
 static const unsigned char column_parity_table[] = {
 	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
 	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
@@ -73,35 +67,11 @@ static const unsigned char column_parity_table[] = {
 	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
 };
 
-/* Count the bits in an unsigned char or a U32 */
-
-static int yaffs_CountBits(unsigned char x)
-{
-	int r = 0;
-	while (x) {
-		if (x & 1)
-			r++;
-		x >>= 1;
-	}
-	return r;
-}
-
-static int yaffs_CountBits32(unsigned x)
-{
-	int r = 0;
-	while (x) {
-		if (x & 1)
-			r++;
-		x >>= 1;
-	}
-	return r;
-}
 
 /* Calculate the ECC for a 256-byte block of data */
-void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc)
+void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc)
 {
 	unsigned int i;
-
 	unsigned char col_parity = 0;
 	unsigned char line_parity = 0;
 	unsigned char line_parity_prime = 0;
@@ -112,12 +82,10 @@ void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc)
 		b = column_parity_table[*data++];
 		col_parity ^= b;
 
-		if (b & 0x01)	// odd number of bits in the byte
-		{
+		if (b & 0x01) {	/* odd number of bits in the byte */
 			line_parity ^= i;
 			line_parity_prime ^= ~i;
 		}
-
 	}
 
 	ecc[2] = (~col_parity) | 0x03;
@@ -160,19 +128,12 @@ void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc)
 		t |= 0x01;
 	ecc[0] = ~t;
 
-#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
-	// Swap the bytes into the wrong order
-	t = ecc[0];
-	ecc[0] = ecc[1];
-	ecc[1] = t;
-#endif
 }
 
-
 /* Correct the ECC on a 256 byte block of data */
 
-int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
-		     const unsigned char *test_ecc)
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+		      const unsigned char *test_ecc)
 {
 	unsigned char d0, d1, d2;	/* deltas */
 
@@ -181,7 +142,7 @@ int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
 	d2 = read_ecc[2] ^ test_ecc[2];
 
 	if ((d0 | d1 | d2) == 0)
-		return 0; /* no error */
+		return 0;	/* no error */
 
 	if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
 	    ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
@@ -191,15 +152,6 @@ int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
 		unsigned byte;
 		unsigned bit;
 
-#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
-		// swap the bytes to correct for the wrong order
-		unsigned char t;
-
-		t = d0;
-		d0 = d1;
-		d1 = t;
-#endif
-
 		bit = byte = 0;
 
 		if (d1 & 0x80)
@@ -228,19 +180,17 @@ int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
 
 		data[byte] ^= (1 << bit);
 
-		return 1; /* Corrected the error */
+		return 1;	/* Corrected the error */
 	}
 
-	if ((yaffs_CountBits(d0) +
-	     yaffs_CountBits(d1) +
-	     yaffs_CountBits(d2)) ==  1) {
+	if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
 		/* Reccoverable error in ecc */
 
 		read_ecc[0] = test_ecc[0];
 		read_ecc[1] = test_ecc[1];
 		read_ecc[2] = test_ecc[2];
 
-		return 1; /* Corrected the error */
+		return 1;	/* Corrected the error */
 	}
 
 	/* Unrecoverable error */
@@ -249,25 +199,23 @@ int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
 
 }
 
-
 /*
  * ECCxxxOther does ECC calcs on arbitrary n bytes of data
  */
-void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
-			     yaffs_ECCOther * eccOther)
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+			  struct yaffs_ecc_other *ecc_other)
 {
 	unsigned int i;
-
 	unsigned char col_parity = 0;
 	unsigned line_parity = 0;
 	unsigned line_parity_prime = 0;
 	unsigned char b;
 
-	for (i = 0; i < nBytes; i++) {
+	for (i = 0; i < n_bytes; i++) {
 		b = column_parity_table[*data++];
 		col_parity ^= b;
 
-		if (b & 0x01)	 {
+		if (b & 0x01) {
 			/* odd number of bits in the byte */
 			line_parity ^= i;
 			line_parity_prime ^= ~i;
@@ -275,59 +223,59 @@ void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
 
 	}
 
-	eccOther->colParity = (col_parity >> 2) & 0x3f;
-	eccOther->lineParity = line_parity;
-	eccOther->lineParityPrime = line_parity_prime;
+	ecc_other->col_parity = (col_parity >> 2) & 0x3f;
+	ecc_other->line_parity = line_parity;
+	ecc_other->line_parity_prime = line_parity_prime;
 }
 
-int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
-			  yaffs_ECCOther * read_ecc,
-			  const yaffs_ECCOther * test_ecc)
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+			    struct yaffs_ecc_other *read_ecc,
+			    const struct yaffs_ecc_other *test_ecc)
 {
-	unsigned char cDelta;	/* column parity delta */
-	unsigned lDelta;	/* line parity delta */
-	unsigned lDeltaPrime;	/* line parity delta */
+	unsigned char delta_col;	/* column parity delta */
+	unsigned delta_line;	/* line parity delta */
+	unsigned delta_line_prime;	/* line parity delta */
 	unsigned bit;
 
-	cDelta = read_ecc->colParity ^ test_ecc->colParity;
-	lDelta = read_ecc->lineParity ^ test_ecc->lineParity;
-	lDeltaPrime = read_ecc->lineParityPrime ^ test_ecc->lineParityPrime;
+	delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
+	delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
+	delta_line_prime =
+	    read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
 
-	if ((cDelta | lDelta | lDeltaPrime) == 0)
-		return 0; /* no error */
+	if ((delta_col | delta_line | delta_line_prime) == 0)
+		return 0;	/* no error */
 
-	if (lDelta == ~lDeltaPrime &&
-	    (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15))
-	{
+	if (delta_line == ~delta_line_prime &&
+	    (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
 		/* Single bit (recoverable) error in data */
 
 		bit = 0;
 
-		if (cDelta & 0x20)
+		if (delta_col & 0x20)
 			bit |= 0x04;
-		if (cDelta & 0x08)
+		if (delta_col & 0x08)
 			bit |= 0x02;
-		if (cDelta & 0x02)
+		if (delta_col & 0x02)
 			bit |= 0x01;
 
-		if(lDelta >= nBytes)
+		if (delta_line >= n_bytes)
 			return -1;
 
-		data[lDelta] ^= (1 << bit);
+		data[delta_line] ^= (1 << bit);
 
-		return 1; /* corrected */
+		return 1;	/* corrected */
 	}
 
-	if ((yaffs_CountBits32(lDelta) + yaffs_CountBits32(lDeltaPrime) +
-	     yaffs_CountBits(cDelta)) == 1) {
+	if ((hweight32(delta_line) +
+	     hweight32(delta_line_prime) +
+	     hweight8(delta_col)) == 1) {
 		/* Reccoverable error in ecc */
 
 		*read_ecc = *test_ecc;
-		return 1; /* corrected */
+		return 1;	/* corrected */
 	}
 
 	/* Unrecoverable error */
 
 	return -1;
-
 }
diff --git a/fs/yaffs2/yaffs_ecc.h b/fs/yaffs2/yaffs_ecc.h
index 79bc3d1..17d47bd 100644
--- a/fs/yaffs2/yaffs_ecc.h
+++ b/fs/yaffs2/yaffs_ecc.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,32 +13,32 @@
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  */
 
- /*
-  * This code implements the ECC algorithm used in SmartMedia.
-  *
-  * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
-  * The two unused bit are set to 1.
-  * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
-  * blocks are used on a 512-byte NAND page.
-  *
-  */
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data.
+ * Thus, two such ECC blocks are used on a 512-byte NAND page.
+ *
+ */
 
 #ifndef __YAFFS_ECC_H__
 #define __YAFFS_ECC_H__
 
-typedef struct {
-	unsigned char colParity;
-	unsigned lineParity;
-	unsigned lineParityPrime;
-} yaffs_ECCOther;
+struct yaffs_ecc_other {
+	unsigned char col_parity;
+	unsigned line_parity;
+	unsigned line_parity_prime;
+};
 
-void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc);
-int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
-		     const unsigned char *test_ecc);
+void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc);
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+		      const unsigned char *test_ecc);
 
-void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
-			     yaffs_ECCOther * ecc);
-int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
-			  yaffs_ECCOther * read_ecc,
-			  const yaffs_ECCOther * test_ecc);
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+			  struct yaffs_ecc_other *ecc);
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+			    struct yaffs_ecc_other *read_ecc,
+			    const struct yaffs_ecc_other *test_ecc);
 #endif
diff --git a/fs/yaffs2/yaffs_error.c b/fs/yaffs2/yaffs_error.c
new file mode 100644
index 0000000..11b75f7
--- /dev/null
+++ b/fs/yaffs2/yaffs_error.c
@@ -0,0 +1,58 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Timothy Manning <timothy@yaffs.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffsfs.h"
+
+struct error_entry {
+	int code;
+	const char *text;
+};
+
+static const struct error_entry error_list[] = {
+	{ ENOMEM , "ENOMEM" },
+	{ EBUSY , "EBUSY"},
+	{ ENODEV , "ENODEV"},
+	{ EINVAL , "EINVAL"},
+	{ EBADF , "EBADF"},
+	{ EACCES , "EACCES"},
+	{ EXDEV , "EXDEV" },
+	{ ENOENT , "ENOENT"},
+	{ ENOSPC , "ENOSPC"},
+	{ ERANGE , "ERANGE"},
+	{ ENODATA, "ENODATA"},
+	{ ENOTEMPTY, "ENOTEMPTY"},
+	{ ENAMETOOLONG, "ENAMETOOLONG"},
+	{ ENOMEM , "ENOMEM"},
+	{ EEXIST , "EEXIST"},
+	{ ENOTDIR , "ENOTDIR"},
+	{ EISDIR , "EISDIR"},
+	{ ENFILE, "ENFILE"},
+	{ EROFS, "EROFS"},
+	{ EFAULT, "EFAULT"},
+	{ 0, NULL }
+};
+
+const char *yaffs_error_to_str(int err)
+{
+	const struct error_entry *e = error_list;
+
+	if (err < 0)
+		err = -err;
+
+	while (e->code && e->text) {
+		if (err == e->code)
+			return e->text;
+		e++;
+	}
+	return "Unknown error code";
+}
diff --git a/fs/yaffs2/yaffs_flashif.h b/fs/yaffs2/yaffs_flashif.h
index 4e5157e..e6e8979 100644
--- a/fs/yaffs2/yaffs_flashif.h
+++ b/fs/yaffs2/yaffs_flashif.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -18,14 +18,18 @@
 
 
 #include "yaffs_guts.h"
-int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
-int yflash_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);
-int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags);
-int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
-int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
-int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
-int yflash_InitialiseNAND(yaffs_Device *dev);
-int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
-int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber);
+int yflash_WriteChunkToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_spare *spare);
+int yflash_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_ext_tags *tags);
+int yflash_ReadChunkFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_spare *spare);
+int yflash_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_ext_tags *tags);
+int yflash_InitialiseNAND(struct yaffs_dev *dev);
+int yflash_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no);
+int yflash_QueryNANDBlock(struct yaffs_dev *dev, int block_no,
+			enum yaffs_block_state *state, u32 *seq_number);
 
 #endif
diff --git a/fs/yaffs2/yaffs_flashif2.h b/fs/yaffs2/yaffs_flashif2.h
new file mode 100644
index 0000000..cfdbde9
--- /dev/null
+++ b/fs/yaffs2/yaffs_flashif2.h
@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_FLASH2_H__
+#define __YAFFS_FLASH2_H__
+
+
+#include "yaffs_guts.h"
+int yflash2_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber);
+int yflash2_WriteChunkToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_spare *spare);
+int yflash2_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_ext_tags *tags);
+int yflash2_ReadChunkFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_spare *spare);
+int yflash2_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_ext_tags *tags);
+int yflash2_InitialiseNAND(struct yaffs_dev *dev);
+int yflash2_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no);
+int yflash2_QueryNANDBlock(struct yaffs_dev *dev, int block_no,
+			enum yaffs_block_state *state, u32 *seq_number);
+
+#endif
diff --git a/fs/yaffs2/yaffs_getblockinfo.h b/fs/yaffs2/yaffs_getblockinfo.h
new file mode 100644
index 0000000..8fd0802
--- /dev/null
+++ b/fs/yaffs2/yaffs_getblockinfo.h
@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GETBLOCKINFO_H__
+#define __YAFFS_GETBLOCKINFO_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+
+/* Function to manipulate block info */
+static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev
+							      *dev, int blk)
+{
+	if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>> yaffs: get_block_info block %d is not valid",
+			blk);
+		BUG();
+	}
+	return &dev->block_info[blk - dev->internal_start_block];
+}
+
+#endif
diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c
index 7390b40..00d1c5a 100644
--- a/fs/yaffs2/yaffs_guts.c
+++ b/fs/yaffs2/yaffs_guts.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,259 +11,176 @@
  * published by the Free Software Foundation.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-
-const char *yaffs_guts_c_version =
-    "$Id: yaffs_guts.c,v 1.52 2007/10/16 00:45:05 charles Exp $";
-
 #include "yportenv.h"
-#include "linux/stat.h"
+#include "yaffs_trace.h"
 
-#include "yaffsinterface.h"
-#include "yaffsfs.h"
 #include "yaffs_guts.h"
-#include "yaffs_tagsvalidity.h"
-
+#include "yaffs_getblockinfo.h"
 #include "yaffs_tagscompat.h"
-#ifndef  CONFIG_YAFFS_USE_OWN_SORT
-#include "yaffs_qsort.h"
-#endif
 #include "yaffs_nand.h"
-
-#include "yaffs_checkptrw.h"
-
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
 #include "yaffs_nand.h"
 #include "yaffs_packedtags2.h"
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
+#include "yaffs_attribs.h"
+#include "yaffs_summary.h"
 
-#include "malloc.h"
-
-#ifdef CONFIG_YAFFS_WINCE
-void yfsd_LockYAFFS(BOOL fsLockOnly);
-void yfsd_UnlockYAFFS(BOOL fsLockOnly);
-#endif
-
-#define YAFFS_PASSIVE_GC_CHUNKS 2
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
 
 #include "yaffs_ecc.h"
 
+/* Forward declarations */
 
-/* Robustification (if it ever comes about...) */
-static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
-static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
-static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
-				     const __u8 * data,
-				     const yaffs_ExtendedTags * tags);
-static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
-				    const yaffs_ExtendedTags * tags);
-
-/* Other local prototypes */
-static int yaffs_UnlinkObject( yaffs_Object *obj);
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
-
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
-
-static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
-					     const __u8 * buffer,
-					     yaffs_ExtendedTags * tags,
-					     int useReserve);
-static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
-				  int chunkInNAND, int inScan);
-
-static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
-					   yaffs_ObjectType type);
-static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
-				       yaffs_Object * obj);
-static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
-				    int force, int isShrink, int shadows);
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
-static int yaffs_CheckStructures(void);
-static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
-
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
-
-static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
-static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
-				    int lineNo);
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
-				  int chunkInNAND);
-
-static int yaffs_UnlinkWorker(yaffs_Object * obj);
-static void yaffs_DestroyObject(yaffs_Object * obj);
-
-static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
-			   int chunkInObject);
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+			     const u8 *buffer, int n_bytes, int use_reserve);
 
-loff_t yaffs_GetFileSize(yaffs_Object * obj);
 
-static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
 
-static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
-
-static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
-
-#ifdef YAFFS_PARANOID
-static int yaffs_CheckFileSanity(yaffs_Object * in);
-#else
-#define yaffs_CheckFileSanity(in)
-#endif
+/* Function to calculate chunk and offset */
 
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
-static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+				int *chunk_out, u32 *offset_out)
+{
+	int chunk;
+	u32 offset;
 
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
+	chunk = (u32) (addr >> dev->chunk_shift);
 
-static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
-				 yaffs_ExtendedTags * tags);
+	if (dev->chunk_div == 1) {
+		/* easy power of 2 case */
+		offset = (u32) (addr & dev->chunk_mask);
+	} else {
+		/* Non power-of-2 case */
 
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
-					  yaffs_FileStructure * fStruct,
-					  __u32 chunkId);
+		loff_t chunk_base;
 
+		chunk /= dev->chunk_div;
 
-/* Function to calculate chunk and offset */
-
-static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
-{
-	if(dev->chunkShift){
-		/* Easy-peasy power of 2 case */
-		*chunk  = (__u32)(addr >> dev->chunkShift);
-		*offset = (__u32)(addr & dev->chunkMask);
-	}
-	else if(dev->crumbsPerChunk)
-	{
-		/* Case where we're using "crumbs" */
-		*offset = (__u32)(addr & dev->crumbMask);
-		addr >>= dev->crumbShift;
-		*chunk = ((__u32)addr)/dev->crumbsPerChunk;
-		*offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
+		chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
+		offset = (u32) (addr - chunk_base);
 	}
-	else
-		YBUG();
+
+	*chunk_out = chunk;
+	*offset_out = offset;
 }
 
-/* Function to return the number of shifts for a power of 2 greater than or equal
- * to the given number
+/* Function to return the number of shifts for a power of 2 greater than or
+ * equal to the given number
  * Note we don't try to cater for all possible numbers and this does not have to
  * be hellishly efficient.
  */
 
-static __u32 ShiftsGE(__u32 x)
+static inline u32 calc_shifts_ceiling(u32 x)
 {
-	int extraBits;
-	int nShifts;
+	int extra_bits;
+	int shifts;
 
-	nShifts = extraBits = 0;
+	shifts = extra_bits = 0;
 
-	while(x>1){
-		if(x & 1) extraBits++;
-		x>>=1;
-		nShifts++;
+	while (x > 1) {
+		if (x & 1)
+			extra_bits++;
+		x >>= 1;
+		shifts++;
 	}
 
-	if(extraBits)
-		nShifts++;
+	if (extra_bits)
+		shifts++;
 
-	return nShifts;
+	return shifts;
 }
 
 /* Function to return the number of shifts to get a 1 in bit 0
  */
 
-static __u32 ShiftDiv(__u32 x)
+static inline u32 calc_shifts(u32 x)
 {
-	int nShifts;
+	u32 shifts;
 
-	nShifts =  0;
+	shifts = 0;
 
-	if(!x) return 0;
+	if (!x)
+		return 0;
 
-	while( !(x&1)){
-		x>>=1;
-		nShifts++;
+	while (!(x & 1)) {
+		x >>= 1;
+		shifts++;
 	}
 
-	return nShifts;
+	return shifts;
 }
 
-
-
 /*
  * Temporary buffer manipulations.
  */
 
-static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
+static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
 {
 	int i;
-	__u8 *buf = (__u8 *)1;
+	u8 *buf = (u8 *) 1;
 
-	memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
+	memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
 
 	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
-		dev->tempBuffer[i].line = 0;	/* not in use */
-		dev->tempBuffer[i].buffer = buf =
-		    YMALLOC_DMA(dev->nDataBytesPerChunk);
+		dev->temp_buffer[i].in_use = 0;
+		buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+		dev->temp_buffer[i].buffer = buf;
 	}
 
 	return buf ? YAFFS_OK : YAFFS_FAIL;
-
 }
 
-static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
+u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
 {
-	int i, j;
-	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-		if (dev->tempBuffer[i].line == 0) {
-			dev->tempBuffer[i].line = lineNo;
-			if ((i + 1) > dev->maxTemp) {
-				dev->maxTemp = i + 1;
-				for (j = 0; j <= i; j++)
-					dev->tempBuffer[j].maxLine =
-					    dev->tempBuffer[j].line;
-			}
+	int i;
 
-			return dev->tempBuffer[i].buffer;
-		}
-	}
+	dev->temp_in_use++;
+	if (dev->temp_in_use > dev->max_temp)
+		dev->max_temp = dev->temp_in_use;
 
-	T(YAFFS_TRACE_BUFFERS,
-	  (TSTR("Out of temp buffers at line %d, other held by lines:"),
-	   lineNo));
 	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-		T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
+		if (dev->temp_buffer[i].in_use == 0) {
+			dev->temp_buffer[i].in_use = 1;
+			return dev->temp_buffer[i].buffer;
+		}
 	}
-	T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 
+	yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
 	/*
 	 * If we got here then we have to allocate an unmanaged one
 	 * This is not good.
 	 */
 
-	dev->unmanagedTempAllocations++;
-	return YMALLOC(dev->nDataBytesPerChunk);
+	dev->unmanaged_buffer_allocs++;
+	return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
 
 }
 
-static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
-				    int lineNo)
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
 {
 	int i;
+
+	dev->temp_in_use--;
+
 	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-		if (dev->tempBuffer[i].buffer == buffer) {
-			dev->tempBuffer[i].line = 0;
+		if (dev->temp_buffer[i].buffer == buffer) {
+			dev->temp_buffer[i].in_use = 0;
 			return;
 		}
 	}
 
 	if (buffer) {
 		/* assume it is an unmanaged one. */
-		T(YAFFS_TRACE_BUFFERS,
-		  (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
-		   lineNo));
-		YFREE(buffer);
-		dev->unmanagedTempDeallocations++;
+		yaffs_trace(YAFFS_TRACE_BUFFERS,
+			"Releasing unmanaged temp buffer");
+		kfree(buffer);
+		dev->unmanaged_buffer_deallocs++;
 	}
 
 }
@@ -271,621 +188,339 @@ static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
 /*
  * Determine if we have a managed buffer.
  */
-int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
+int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
 {
 	int i;
+
 	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-		if (dev->tempBuffer[i].buffer == buffer)
+		if (dev->temp_buffer[i].buffer == buffer)
 			return 1;
-
 	}
 
-    for (i = 0; i < dev->nShortOpCaches; i++) {
-	if( dev->srCache[i].data == buffer )
-	    return 1;
-
-    }
+	for (i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].data == buffer)
+			return 1;
+	}
 
-    if (buffer == dev->checkpointBuffer)
-      return 1;
+	if (buffer == dev->checkpt_buffer)
+		return 1;
 
-    T(YAFFS_TRACE_ALWAYS,
-	  (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
-    return 0;
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+	  "yaffs: unmaged buffer detected.");
+	return 0;
 }
 
-
-
 /*
- * Chunk bitmap manipulations
+ * Functions for robustisizing TODO
+ *
  */
 
-static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+				     const u8 *data,
+				     const struct yaffs_ext_tags *tags)
 {
-	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
-		   blk));
-		YBUG();
-	}
-	return dev->chunkBits +
-	    (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+	dev = dev;
+	nand_chunk = nand_chunk;
+	data = data;
+	tags = tags;
 }
 
-static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+				      const struct yaffs_ext_tags *tags)
 {
-	if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
-	   chunk < 0 || chunk >= dev->nChunksPerBlock) {
-	   T(YAFFS_TRACE_ERROR,
-	    (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
-	    YBUG();
-	}
-}
-
-static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
-{
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-
-	memset(blkBits, 0, dev->chunkBitmapStride);
+	dev = dev;
+	nand_chunk = nand_chunk;
+	tags = tags;
 }
 
-static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+			      struct yaffs_block_info *bi)
 {
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	if (!bi->gc_prioritise) {
+		bi->gc_prioritise = 1;
+		dev->has_pending_prioritised_gc = 1;
+		bi->chunk_error_strikes++;
 
-	yaffs_VerifyChunkBitId(dev,blk,chunk);
+		if (bi->chunk_error_strikes > 3) {
+			bi->needs_retiring = 1;	/* Too many stikes, so retire */
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"yaffs: Block struck out");
 
-	blkBits[chunk / 8] &= ~(1 << (chunk & 7));
-}
-
-static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
-{
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-
-	yaffs_VerifyChunkBitId(dev,blk,chunk);
-
-	blkBits[chunk / 8] |= (1 << (chunk & 7));
+		}
+	}
 }
 
-static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+					int erased_ok)
 {
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-	yaffs_VerifyChunkBitId(dev,blk,chunk);
+	int flash_block = nand_chunk / dev->param.chunks_per_block;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
 
-	return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
-}
+	yaffs_handle_chunk_error(dev, bi);
 
-static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
-{
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-	int i;
-	for (i = 0; i < dev->chunkBitmapStride; i++) {
-		if (*blkBits)
-			return 1;
-		blkBits++;
+	if (erased_ok) {
+		/* Was an actual write failure,
+		 * so mark the block for retirement.*/
+		bi->needs_retiring = 1;
+		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  "**>> Block %d needs retiring", flash_block);
 	}
-	return 0;
-}
-
-static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
-{
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-	int i;
-	int n = 0;
-	for (i = 0; i < dev->chunkBitmapStride; i++) {
-		__u8 x = *blkBits;
-		while(x){
-			if(x & 1)
-				n++;
-			x >>=1;
-		}
 
-		blkBits++;
-	}
-	return n;
+	/* Delete the chunk */
+	yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+	yaffs_skip_rest_of_block(dev);
 }
 
 /*
  * Verification code
  */
 
-static Y_INLINE int yaffs_SkipVerification(yaffs_Device *dev)
-{
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
-}
-
-static Y_INLINE int yaffs_SkipFullVerification(yaffs_Device *dev)
-{
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
-}
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
 
-static Y_INLINE int yaffs_SkipNANDVerification(yaffs_Device *dev)
+static inline int yaffs_hash_fn(int n)
 {
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+	if (n < 0)
+		n = -n;
+	return n % YAFFS_NOBJECT_BUCKETS;
 }
 
-static const char * blockStateName[] = {
-"Unknown",
-"Needs scanning",
-"Scanning",
-"Empty",
-"Allocating",
-"Full",
-"Dirty",
-"Checkpoint",
-"Collecting",
-"Dead"
-};
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
 
-static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
 {
-	int actuallyUsed;
-	int inUse;
-
-	if(yaffs_SkipVerification(dev))
-		return;
-
-	/* Report illegal runtime states */
-	if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
-		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
-
-	switch(bi->blockState){
-	 case YAFFS_BLOCK_STATE_UNKNOWN:
-	 case YAFFS_BLOCK_STATE_SCANNING:
-	 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
-		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
-		n,blockStateName[bi->blockState]));
-	}
-
-	/* Check pages in use and soft deletions are legal */
-
-	actuallyUsed = bi->pagesInUse - bi->softDeletions;
-
-	if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
-	   bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
-	   actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
-		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
-		n,bi->pagesInUse,bi->softDeletions));
-
-
-	/* Check chunk bitmap legal */
-	inUse = yaffs_CountChunkBits(dev,n);
-	if(inUse != bi->pagesInUse)
-		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
-			n,bi->pagesInUse,inUse));
-
-	/* Check that the sequence number is valid.
-	 * Ten million is legal, but is very unlikely
-	 */
-	if(dev->isYaffs2 &&
-	   (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
-	   (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
-		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
-		n,bi->sequenceNumber));
-
+	return dev->root_dir;
 }
 
-static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
 {
-	yaffs_VerifyBlock(dev,bi,n);
+	return dev->lost_n_found;
+}
 
-	/* After collection the block should be in the erased state */
-	/* TODO: This will need to change if we do partial gc */
+/*
+ *  Erased NAND checking functions
+ */
 
-	if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
-		T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
-			n,bi->blockState));
+int yaffs_check_ff(u8 *buffer, int n_bytes)
+{
+	/* Horrible, slow implementation */
+	while (n_bytes--) {
+		if (*buffer != 0xff)
+			return 0;
+		buffer++;
 	}
+	return 1;
 }
 
-static void yaffs_VerifyBlocks(yaffs_Device *dev)
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
 {
-	int i;
-	int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
-	int nIllegalBlockStates = 0;
-
-
-	if(yaffs_SkipVerification(dev))
-		return;
-
-	memset(nBlocksPerState,0,sizeof(nBlocksPerState));
-
+	int retval = YAFFS_OK;
+	u8 *data = yaffs_get_temp_buffer(dev);
+	struct yaffs_ext_tags tags;
+	int result;
 
-	for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
-		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
-		yaffs_VerifyBlock(dev,bi,i);
+	result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
 
-		if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
-			nBlocksPerState[bi->blockState]++;
-		else
-			nIllegalBlockStates++;
+	if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
+		retval = YAFFS_FAIL;
 
+	if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
+		tags.chunk_used) {
+		yaffs_trace(YAFFS_TRACE_NANDACCESS,
+			"Chunk %d not erased", nand_chunk);
+		retval = YAFFS_FAIL;
 	}
 
-	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
-	T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
-
-	T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
-	if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
-		T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
-
-	for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
-		T(YAFFS_TRACE_VERIFY,
-		  (TSTR("%s %d blocks"TENDSTR),
-		  blockStateName[i],nBlocksPerState[i]));
+	yaffs_release_temp_buffer(dev, data);
 
-	if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
-		 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
-
-	if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
-		 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
-
-	if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
-		 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
-
-	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
+	return retval;
 
 }
 
-/*
- * Verify the object header. oh must be valid, but obj and tags may be NULL in which
- * case those tests will not be performed.
- */
-static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+				      int nand_chunk,
+				      const u8 *data,
+				      struct yaffs_ext_tags *tags)
 {
-	if(yaffs_SkipVerification(obj->myDev))
-		return;
-
-	if(!(tags && obj && oh)){
-		T(YAFFS_TRACE_VERIFY,
-				(TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
-				(__u32)tags,(__u32)obj,(__u32)oh));
-		return;
-	}
-
-	if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
-	   oh->type > YAFFS_OBJECT_TYPE_MAX)
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
-		 tags->objectId, oh->type));
-
-	if(tags->objectId != obj->objectId)
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
-		 tags->objectId, obj->objectId));
+	int retval = YAFFS_OK;
+	struct yaffs_ext_tags temp_tags;
+	u8 *buffer = yaffs_get_temp_buffer(dev);
+	int result;
+
+	result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
+	if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
+	    temp_tags.obj_id != tags->obj_id ||
+	    temp_tags.chunk_id != tags->chunk_id ||
+	    temp_tags.n_bytes != tags->n_bytes)
+		retval = YAFFS_FAIL;
 
+	yaffs_release_temp_buffer(dev, buffer);
 
-	/*
-	 * Check that the object's parent ids match if parentCheck requested.
-	 *
-	 * Tests do not apply to the root object.
-	 */
-
-	if(parentCheck && tags->objectId > 1 && !obj->parent)
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
-		 tags->objectId, oh->parentObjectId));
+	return retval;
+}
 
 
-	if(parentCheck && obj->parent &&
-	   oh->parentObjectId != obj->parent->objectId &&
-	   (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
-	    obj->parent->objectId != YAFFS_OBJECTID_DELETED))
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
-		 tags->objectId, oh->parentObjectId, obj->parent->objectId));
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
+{
+	int reserved_chunks;
+	int reserved_blocks = dev->param.n_reserved_blocks;
+	int checkpt_blocks;
 
+	checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
 
-	if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
-		T(YAFFS_TRACE_VERIFY,
-		(TSTR("Obj %d header name is NULL"TENDSTR),
-		 obj->objectId));
+	reserved_chunks =
+	    (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
 
-	if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
-		T(YAFFS_TRACE_VERIFY,
-		(TSTR("Obj %d header name is 0xFF"TENDSTR),
-		 obj->objectId));
+	return (dev->n_free_chunks > (reserved_chunks + n_chunks));
 }
 
-static void yaffs_VerifyFile(yaffs_Object *obj)
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
 {
-	int requiredTallness;
-	int actualTallness;
-	__u32 lastChunk;
-	__u32 x;
-	__u32 i;
-	yaffs_Device *dev;
-	yaffs_ExtendedTags tags;
-	yaffs_Tnode *tn;
-	__u32 objectId;
-
-	if(obj && yaffs_SkipVerification(obj->myDev))
-		return;
+	int i;
+	struct yaffs_block_info *bi;
 
-	dev = obj->myDev;
-	objectId = obj->objectId;
+	if (dev->n_erased_blocks < 1) {
+		/* Hoosterman we've got a problem.
+		 * Can't get space to gc
+		 */
+		yaffs_trace(YAFFS_TRACE_ERROR,
+		  "yaffs tragedy: no more erased blocks");
 
-	/* Check file size is consistent with tnode depth */
-	lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
-	x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
-	requiredTallness = 0;
-	while (x> 0) {
-		x >>= YAFFS_TNODES_INTERNAL_BITS;
-		requiredTallness++;
+		return -1;
 	}
 
-	actualTallness = obj->variant.fileVariant.topLevel;
-
-	if(requiredTallness > actualTallness )
-		T(YAFFS_TRACE_VERIFY,
-		(TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
-		 obj->objectId,actualTallness, requiredTallness));
-
-
-	/* Check that the chunks in the tnode tree are all correct.
-	 * We do this by scanning through the tnode tree and
-	 * checking the tags for every chunk match.
-	 */
-
-	if(yaffs_SkipNANDVerification(dev))
-		return;
+	/* Find an empty block. */
 
-	for(i = 1; i <= lastChunk; i++){
-		tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
-
-		if (tn) {
-			__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
-			if(theChunk > 0){
-				/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
-				yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
-				if(tags.objectId != objectId || tags.chunkId != i){
-					T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
-						objectId, i, theChunk,
-						tags.objectId, tags.chunkId));
-				}
-			}
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		dev->alloc_block_finder++;
+		if (dev->alloc_block_finder < dev->internal_start_block
+		    || dev->alloc_block_finder > dev->internal_end_block) {
+			dev->alloc_block_finder = dev->internal_start_block;
 		}
 
+		bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+			bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
+			dev->seq_number++;
+			bi->seq_number = dev->seq_number;
+			dev->n_erased_blocks--;
+			yaffs_trace(YAFFS_TRACE_ALLOCATE,
+			  "Allocated block %d, seq  %d, %d left" ,
+			   dev->alloc_block_finder, dev->seq_number,
+			   dev->n_erased_blocks);
+			return dev->alloc_block_finder;
+		}
 	}
 
-}
-
-static void yaffs_VerifyDirectory(yaffs_Object *obj)
-{
-	if(obj && yaffs_SkipVerification(obj->myDev))
-		return;
-
-}
-
-static void yaffs_VerifyHardLink(yaffs_Object *obj)
-{
-	if(obj && yaffs_SkipVerification(obj->myDev))
-		return;
-
-	/* Verify sane equivalent object */
-}
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs tragedy: no more erased blocks, but there should have been %d",
+		dev->n_erased_blocks);
 
-static void yaffs_VerifySymlink(yaffs_Object *obj)
-{
-	if(obj && yaffs_SkipVerification(obj->myDev))
-		return;
-
-	/* Verify symlink string */
-}
-
-static void yaffs_VerifySpecial(yaffs_Object *obj)
-{
-	if(obj && yaffs_SkipVerification(obj->myDev))
-		return;
+	return -1;
 }
 
-static void yaffs_VerifyObject(yaffs_Object *obj)
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+			     struct yaffs_block_info **block_ptr)
 {
-	yaffs_Device *dev;
-
-	__u32 chunkMin;
-	__u32 chunkMax;
-
-	__u32 chunkIdOk;
-	__u32 chunkIsLive;
-
-	if(!obj)
-		return;
-
-	dev = obj->myDev;
-
-	if(yaffs_SkipVerification(dev))
-		return;
+	int ret_val;
+	struct yaffs_block_info *bi;
 
-	/* Check sane object header chunk */
-
-	chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
-	chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
+	if (dev->alloc_block < 0) {
+		/* Get next block to allocate off */
+		dev->alloc_block = yaffs_find_alloc_block(dev);
+		dev->alloc_page = 0;
+	}
 
-	chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
-	chunkIsLive = chunkIdOk &&
-			yaffs_CheckChunkBit(dev,
-					    obj->chunkId / dev->nChunksPerBlock,
-					    obj->chunkId % dev->nChunksPerBlock);
-	if(!obj->fake &&
-	    (!chunkIdOk || !chunkIsLive)) {
-	   T(YAFFS_TRACE_VERIFY,
-	   (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
-	   obj->objectId,obj->chunkId,
-	   chunkIdOk ? "" : ",out of range",
-	   chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
+	if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+		/* No space unless we're allowed to use the reserve. */
+		return -1;
 	}
 
-	if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
-		yaffs_ExtendedTags tags;
-		yaffs_ObjectHeader *oh;
-		__u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+	if (dev->n_erased_blocks < dev->param.n_reserved_blocks
+	    && dev->alloc_page == 0)
+		yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
 
-		oh = (yaffs_ObjectHeader *)buffer;
+	/* Next page please.... */
+	if (dev->alloc_block >= 0) {
+		bi = yaffs_get_block_info(dev, dev->alloc_block);
 
-		yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
+		ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
+		    dev->alloc_page;
+		bi->pages_in_use++;
+		yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
 
-		yaffs_VerifyObjectHeader(obj,oh,&tags,1);
+		dev->alloc_page++;
 
-		yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
-	}
+		dev->n_free_chunks--;
 
-	/* Verify it has a parent */
-	if(obj && !obj->fake &&
-	   (!obj->parent || obj->parent->myDev != dev)){
-	   T(YAFFS_TRACE_VERIFY,
-	   (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
-	   obj->objectId,obj->parent));
-	}
+		/* If the block is full set the state to full */
+		if (dev->alloc_page >= dev->param.chunks_per_block) {
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
 
-	/* Verify parent is a directory */
-	if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
-	   T(YAFFS_TRACE_VERIFY,
-	   (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
-	   obj->objectId,obj->parent->variantType));
-	}
+		if (block_ptr)
+			*block_ptr = bi;
 
-	switch(obj->variantType){
-	case YAFFS_OBJECT_TYPE_FILE:
-		yaffs_VerifyFile(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		yaffs_VerifySymlink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		yaffs_VerifyDirectory(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		yaffs_VerifyHardLink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		yaffs_VerifySpecial(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-	default:
-		T(YAFFS_TRACE_VERIFY,
-		(TSTR("Obj %d has illegaltype %d"TENDSTR),
-		obj->objectId,obj->variantType));
-		break;
+		return ret_val;
 	}
 
+	yaffs_trace(YAFFS_TRACE_ERROR,
+		"!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
 
+	return -1;
 }
 
-static void yaffs_VerifyObjects(yaffs_Device *dev)
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
 {
-	yaffs_Object *obj;
-	int i;
-	struct list_head *lh;
-
-	if(yaffs_SkipVerification(dev))
-		return;
-
-	/* Iterate through the objects in each hash entry */
-
-	 for(i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++){
-		list_for_each(lh, &dev->objectBucket[i].list) {
-			if (lh) {
-				obj = list_entry(lh, yaffs_Object, hashLink);
-				yaffs_VerifyObject(obj);
-			}
-		}
-	 }
+	int n;
 
-}
+	n = dev->n_erased_blocks * dev->param.chunks_per_block;
 
+	if (dev->alloc_block > 0)
+		n += (dev->param.chunks_per_block - dev->alloc_page);
 
-/*
- *  Simple hash function. Needs to have a reasonable spread
- */
+	return n;
 
-static Y_INLINE int yaffs_HashFunction(int n)
-{
-/* XXX U-BOOT XXX */
-	/*n = abs(n); */
-	if (n < 0)
-		n = -n;
-	return (n % YAFFS_NOBJECT_BUCKETS);
 }
 
 /*
- * Access functions to useful fake objects
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
  */
-
-yaffs_Object *yaffs_Root(yaffs_Device * dev)
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
 {
-	return dev->rootDir;
-}
+	struct yaffs_block_info *bi;
 
-yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
-{
-	return dev->lostNFoundDir;
-}
-
-
-/*
- *  Erased NAND checking functions
- */
-
-int yaffs_CheckFF(__u8 * buffer, int nBytes)
-{
-	/* Horrible, slow implementation */
-	while (nBytes--) {
-		if (*buffer != 0xFF)
-			return 0;
-		buffer++;
-	}
-	return 1;
-}
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
-				  int chunkInNAND)
-{
-
-	int retval = YAFFS_OK;
-	__u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
-	yaffs_ExtendedTags tags;
-
-	yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
-
-	if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
-		retval = YAFFS_FAIL;
-
-
-	if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
-		T(YAFFS_TRACE_NANDACCESS,
-		  (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
-		retval = YAFFS_FAIL;
+	if (dev->alloc_block > 0) {
+		bi = yaffs_get_block_info(dev, dev->alloc_block);
+		if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
 	}
-
-	yaffs_ReleaseTempBuffer(dev, data, __LINE__);
-
-	return retval;
-
 }
 
-static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
-					     const __u8 * data,
-					     yaffs_ExtendedTags * tags,
-					     int useReserve)
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+				 const u8 *data,
+				 struct yaffs_ext_tags *tags, int use_reserver)
 {
 	int attempts = 0;
-	int writeOk = 0;
+	int write_ok = 0;
 	int chunk;
 
-	yaffs_InvalidateCheckpoint(dev);
+	yaffs2_checkpt_invalidate(dev);
 
 	do {
-		yaffs_BlockInfo *bi = 0;
-		int erasedOk = 0;
+		struct yaffs_block_info *bi = 0;
+		int erased_ok = 0;
 
-		chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
+		chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
 		if (chunk < 0) {
 			/* no space */
 			break;
@@ -897,7 +532,7 @@ static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 		 *
 		 * Check the first page we try to write in a block.
 		 * If the check passes then we don't need to check any
-		 * more.	If the check fails, we check again...
+		 * more.        If the check fails, we check again...
 		 * If the block has been erased, we don't need to check.
 		 *
 		 * However, if the block has been prioritised for gc,
@@ -909,55 +544,63 @@ static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 		 * chunk due to power loss.  This checking policy should
 		 * catch that case with very few checks and thus save a
 		 * lot of checks that are most likely not needed.
+		 *
+		 * Mods to the above
+		 * If an erase check fails or the write fails we skip the
+		 * rest of the block.
 		 */
-		if (bi->gcPrioritise) {
-			yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
-			/* try another chunk */
-			continue;
-		}
 
 		/* let's give it a try */
 		attempts++;
 
-#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
-		bi->skipErasedCheck = 0;
-#endif
-		if (!bi->skipErasedCheck) {
-			erasedOk = yaffs_CheckChunkErased(dev, chunk);
-			if (erasedOk != YAFFS_OK) {
-				T(YAFFS_TRACE_ERROR,
-				(TSTR ("**>> yaffs chunk %d was not erased"
-				TENDSTR), chunk));
-
-				/* try another chunk */
+		if (dev->param.always_check_erased)
+			bi->skip_erased_check = 0;
+
+		if (!bi->skip_erased_check) {
+			erased_ok = yaffs_check_chunk_erased(dev, chunk);
+			if (erased_ok != YAFFS_OK) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+				  "**>> yaffs chunk %d was not erased",
+				  chunk);
+
+				/* If not erased, delete this one,
+				 * skip rest of block and
+				 * try another chunk */
+				yaffs_chunk_del(dev, chunk, 1, __LINE__);
+				yaffs_skip_rest_of_block(dev);
 				continue;
 			}
-			bi->skipErasedCheck = 1;
 		}
 
-		writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
-				data, tags);
-		if (writeOk != YAFFS_OK) {
-			yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
-			/* try another chunk */
+		write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
+
+		if (!bi->skip_erased_check)
+			write_ok =
+			    yaffs_verify_chunk_written(dev, chunk, data, tags);
+
+		if (write_ok != YAFFS_OK) {
+			/* Clean up aborted write, skip to next block and
+			 * try another chunk */
+			yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
 			continue;
 		}
 
+		bi->skip_erased_check = 1;
+
 		/* Copy the data into the robustification buffer */
-		yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
+		yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
 
-	} while (writeOk != YAFFS_OK &&
-		(yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
+	} while (write_ok != YAFFS_OK &&
+		 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
 
-	if(!writeOk)
+	if (!write_ok)
 		chunk = -1;
 
 	if (attempts > 1) {
-		T(YAFFS_TRACE_ERROR,
-			(TSTR("**>> yaffs write required %d attempts" TENDSTR),
-			attempts));
-
-		dev->nRetriedWrites += (attempts - 1);
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>> yaffs write required %d attempts",
+			attempts);
+		dev->n_retried_writes += (attempts - 1);
 	}
 
 	return chunk;
@@ -967,109 +610,97 @@ static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
  * Block retiring for handling a broken block.
  */
 
-static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
 {
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
 
-	yaffs_InvalidateCheckpoint(dev);
+	yaffs2_checkpt_invalidate(dev);
 
-	yaffs_MarkBlockBad(dev, blockInNAND);
+	yaffs2_clear_oldest_dirty_seq(dev, bi);
 
-	bi->blockState = YAFFS_BLOCK_STATE_DEAD;
-	bi->gcPrioritise = 0;
-	bi->needsRetiring = 0;
+	if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
+		if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"yaffs: Failed to mark bad and erase block %d",
+				flash_block);
+		} else {
+			struct yaffs_ext_tags tags;
+			int chunk_id =
+			    flash_block * dev->param.chunks_per_block;
+
+			u8 *buffer = yaffs_get_temp_buffer(dev);
+
+			memset(buffer, 0xff, dev->data_bytes_per_chunk);
+			memset(&tags, 0, sizeof(tags));
+			tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
+			if (dev->param.write_chunk_tags_fn(dev, chunk_id -
+							   dev->chunk_offset,
+							   buffer,
+							   &tags) != YAFFS_OK)
+				yaffs_trace(YAFFS_TRACE_ALWAYS,
+					"yaffs: Failed to write bad block marker to block %d",
+					flash_block);
+
+			yaffs_release_temp_buffer(dev, buffer);
+		}
+	}
 
-	dev->nRetiredBlocks++;
-}
+	bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+	bi->gc_prioritise = 0;
+	bi->needs_retiring = 0;
 
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
-				     const __u8 * data,
-				     const yaffs_ExtendedTags * tags)
-{
+	dev->n_retired_blocks++;
 }
 
-static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
-				    const yaffs_ExtendedTags * tags)
-{
-}
+/*---------------- Name handling functions ------------*/
 
-void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
+static u16 yaffs_calc_name_sum(const YCHAR *name)
 {
-	if(!bi->gcPrioritise){
-		bi->gcPrioritise = 1;
-		dev->hasPendingPrioritisedGCs = 1;
-		bi->chunkErrorStrikes ++;
+	u16 sum = 0;
+	u16 i = 1;
 
-		if(bi->chunkErrorStrikes > 3){
-			bi->needsRetiring = 1; /* Too many stikes, so retire this */
-			T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
+	if (!name)
+		return 0;
 
-		}
+	while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
 
+		/* 0x1f mask is case insensitive */
+		sum += ((*name) & 0x1f) * i;
+		i++;
+		name++;
 	}
+	return sum;
 }
 
-static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
 {
-
-	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
-	yaffs_HandleChunkError(dev,bi);
-
-
-	if(erasedOk ) {
-		/* Was an actual write failure, so mark the block for retirement  */
-		bi->needsRetiring = 1;
-		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-		  (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
-
-
-	}
-
-	/* Delete the chunk */
-	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+	memset(obj->short_name, 0, sizeof(obj->short_name));
+	if (name &&
+		yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
+		YAFFS_SHORT_NAME_LENGTH)
+		yaffs_strcpy(obj->short_name, name);
+	else
+		obj->short_name[0] = _Y('\0');
+	obj->sum = yaffs_calc_name_sum(name);
 }
 
-
-/*---------------- Name handling functions ------------*/
-
-static __u16 yaffs_CalcNameSum(const YCHAR * name)
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+				const struct yaffs_obj_hdr *oh)
 {
-	__u16 sum = 0;
-	__u16 i = 1;
-
-	YUCHAR *bname = (YUCHAR *) name;
-	if (bname) {
-		while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-			sum += yaffs_toupper(*bname) * i;
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
+	memset(tmp_name, 0, sizeof(tmp_name));
+	yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
+				YAFFS_MAX_NAME_LENGTH + 1);
+	yaffs_set_obj_name(obj, tmp_name);
 #else
-			sum += (*bname) * i;
+	yaffs_set_obj_name(obj, oh->name);
 #endif
-			i++;
-			bname++;
-		}
-	}
-	return sum;
 }
 
-static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
+loff_t yaffs_max_file_size(struct yaffs_dev *dev)
 {
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-	if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
-		yaffs_strcpy(obj->shortName, name);
-	} else {
-		obj->shortName[0] = _Y('\0');
-	}
-#endif
-	obj->sum = yaffs_CalcNameSum(name);
+	return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
 }
 
 /*-------------------- TNODES -------------------
@@ -1079,381 +710,235 @@ static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
  * in the tnode.
  */
 
-/* yaffs_CreateTnodes creates a bunch more tnodes and
- * adds them to the tnode free list.
- * Don't use this function directly
- */
-
-static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
 {
-	int i;
-	int tnodeSize;
-	yaffs_Tnode *newTnodes;
-	__u8 *mem;
-	yaffs_Tnode *curr;
-	yaffs_Tnode *next;
-	yaffs_TnodeList *tnl;
-
-	if (nTnodes < 1)
-		return YAFFS_OK;
-
-	/* Calculate the tnode size in bytes for variable width tnode support.
-	 * Must be a multiple of 32-bits  */
-	tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-	/* make these things */
-
-	newTnodes = YMALLOC(nTnodes * tnodeSize);
-	mem = (__u8 *)newTnodes;
-
-	if (!newTnodes) {
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	/* Hook them into the free list */
-#if 0
-	for (i = 0; i < nTnodes - 1; i++) {
-		newTnodes[i].internal[0] = &newTnodes[i + 1];
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-		newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-	}
-
-	newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-	newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-	dev->freeTnodes = newTnodes;
-#else
-	/* New hookup for wide tnodes */
-	for(i = 0; i < nTnodes -1; i++) {
-		curr = (yaffs_Tnode *) &mem[i * tnodeSize];
-		next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
-		curr->internal[0] = next;
-	}
-
-	curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
-	curr->internal[0] = dev->freeTnodes;
-	dev->freeTnodes = (yaffs_Tnode *)mem;
-
-#endif
-
-
-	dev->nFreeTnodes += nTnodes;
-	dev->nTnodesCreated += nTnodes;
-
-	/* Now add this bunch of tnodes to a list for freeing up.
-	 * NB If we can't add this to the management list it isn't fatal
-	 * but it just means we can't free this bunch of tnodes later.
-	 */
-
-	tnl = YMALLOC(sizeof(yaffs_TnodeList));
-	if (!tnl) {
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR
-		   ("yaffs: Could not add tnodes to management list" TENDSTR)));
-		   return YAFFS_FAIL;
-
-	} else {
-		tnl->tnodes = newTnodes;
-		tnl->next = dev->allocatedTnodeList;
-		dev->allocatedTnodeList = tnl;
-	}
-
-	T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
-
-	return YAFFS_OK;
-}
-
-/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
-
-static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
-{
-	yaffs_Tnode *tn = NULL;
-
-	/* If there are none left make more */
-	if (!dev->freeTnodes) {
-		yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
-	}
+	struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
 
-	if (dev->freeTnodes) {
-		tn = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-		if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
-			/* Hoosterman, this thing looks like it isn't in the list */
-			T(YAFFS_TRACE_ALWAYS,
-			  (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
-		}
-#endif
-		dev->freeTnodes = dev->freeTnodes->internal[0];
-		dev->nFreeTnodes--;
+	if (tn) {
+		memset(tn, 0, dev->tnode_size);
+		dev->n_tnodes++;
 	}
 
-	return tn;
-}
-
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
-{
-	yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
-
-	if(tn)
-		memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
 
 	return tn;
 }
 
 /* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
+static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
 {
-	if (tn) {
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-		if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
-			/* Hoosterman, this thing looks like it is already in the list */
-			T(YAFFS_TRACE_ALWAYS,
-			  (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
-		}
-		tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-		tn->internal[0] = dev->freeTnodes;
-		dev->freeTnodes = tn;
-		dev->nFreeTnodes++;
-	}
+	yaffs_free_raw_tnode(dev, tn);
+	dev->n_tnodes--;
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
 }
 
-static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
+static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
 {
-	/* Free the list of allocated tnodes */
-	yaffs_TnodeList *tmp;
-
-	while (dev->allocatedTnodeList) {
-		tmp = dev->allocatedTnodeList->next;
-
-		YFREE(dev->allocatedTnodeList->tnodes);
-		YFREE(dev->allocatedTnodeList);
-		dev->allocatedTnodeList = tmp;
-
-	}
-
-	dev->freeTnodes = NULL;
-	dev->nFreeTnodes = 0;
+	yaffs_deinit_raw_tnodes_and_objs(dev);
+	dev->n_obj = 0;
+	dev->n_tnodes = 0;
 }
 
-static void yaffs_InitialiseTnodes(yaffs_Device * dev)
+void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			unsigned pos, unsigned val)
 {
-	dev->allocatedTnodeList = NULL;
-	dev->freeTnodes = NULL;
-	dev->nFreeTnodes = 0;
-	dev->nTnodesCreated = 0;
+	u32 *map = (u32 *) tn;
+	u32 bit_in_map;
+	u32 bit_in_word;
+	u32 word_in_map;
+	u32 mask;
 
-}
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+	val >>= dev->chunk_grp_bits;
 
+	bit_in_map = pos * dev->tnode_width;
+	word_in_map = bit_in_map / 32;
+	bit_in_word = bit_in_map & (32 - 1);
 
-void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
-{
-  __u32 *map = (__u32 *)tn;
-  __u32 bitInMap;
-  __u32 bitInWord;
-  __u32 wordInMap;
-  __u32 mask;
-
-  pos &= YAFFS_TNODES_LEVEL0_MASK;
-  val >>= dev->chunkGroupBits;
-
-  bitInMap = pos * dev->tnodeWidth;
-  wordInMap = bitInMap /32;
-  bitInWord = bitInMap & (32 -1);
+	mask = dev->tnode_mask << bit_in_word;
 
-  mask = dev->tnodeMask << bitInWord;
+	map[word_in_map] &= ~mask;
+	map[word_in_map] |= (mask & (val << bit_in_word));
 
-  map[wordInMap] &= ~mask;
-  map[wordInMap] |= (mask & (val << bitInWord));
-
-  if(dev->tnodeWidth > (32-bitInWord)) {
-    bitInWord = (32 - bitInWord);
-    wordInMap++;;
-    mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
-    map[wordInMap] &= ~mask;
-    map[wordInMap] |= (mask & (val >> bitInWord));
-  }
+	if (dev->tnode_width > (32 - bit_in_word)) {
+		bit_in_word = (32 - bit_in_word);
+		word_in_map++;
+		mask =
+		    dev->tnode_mask >> bit_in_word;
+		map[word_in_map] &= ~mask;
+		map[word_in_map] |= (mask & (val >> bit_in_word));
+	}
 }
 
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			 unsigned pos)
 {
-  __u32 *map = (__u32 *)tn;
-  __u32 bitInMap;
-  __u32 bitInWord;
-  __u32 wordInMap;
-  __u32 val;
+	u32 *map = (u32 *) tn;
+	u32 bit_in_map;
+	u32 bit_in_word;
+	u32 word_in_map;
+	u32 val;
 
-  pos &= YAFFS_TNODES_LEVEL0_MASK;
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
 
-  bitInMap = pos * dev->tnodeWidth;
-  wordInMap = bitInMap /32;
-  bitInWord = bitInMap & (32 -1);
+	bit_in_map = pos * dev->tnode_width;
+	word_in_map = bit_in_map / 32;
+	bit_in_word = bit_in_map & (32 - 1);
 
-  val = map[wordInMap] >> bitInWord;
+	val = map[word_in_map] >> bit_in_word;
 
-  if(dev->tnodeWidth > (32-bitInWord)) {
-    bitInWord = (32 - bitInWord);
-    wordInMap++;;
-    val |= (map[wordInMap] << bitInWord);
-  }
+	if (dev->tnode_width > (32 - bit_in_word)) {
+		bit_in_word = (32 - bit_in_word);
+		word_in_map++;
+		val |= (map[word_in_map] << bit_in_word);
+	}
 
-  val &= dev->tnodeMask;
-  val <<= dev->chunkGroupBits;
+	val &= dev->tnode_mask;
+	val <<= dev->chunk_grp_bits;
 
-  return val;
+	return val;
 }
 
 /* ------------------- End of individual tnode manipulation -----------------*/
 
 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
- * The look up tree is represented by the top tnode and the number of topLevel
+ * The look up tree is represented by the top tnode and the number of top_level
  * in the tree. 0 means only the level 0 tnode is in the tree.
  */
 
 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
-					  yaffs_FileStructure * fStruct,
-					  __u32 chunkId)
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+				       struct yaffs_file_var *file_struct,
+				       u32 chunk_id)
 {
+	struct yaffs_tnode *tn = file_struct->top;
+	u32 i;
+	int required_depth;
+	int level = file_struct->top_level;
 
-	yaffs_Tnode *tn = fStruct->top;
-	__u32 i;
-	int requiredTallness;
-	int level = fStruct->topLevel;
+	dev = dev;
 
 	/* Check sane level and chunk Id */
-	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
+	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
 		return NULL;
-	}
 
-	if (chunkId > YAFFS_MAX_CHUNK_ID) {
+	if (chunk_id > YAFFS_MAX_CHUNK_ID)
 		return NULL;
-	}
 
-	/* First check we're tall enough (ie enough topLevel) */
+	/* First check we're tall enough (ie enough top_level) */
 
-	i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-	requiredTallness = 0;
+	i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
 	while (i) {
 		i >>= YAFFS_TNODES_INTERNAL_BITS;
-		requiredTallness++;
+		required_depth++;
 	}
 
-	if (requiredTallness > fStruct->topLevel) {
-		/* Not tall enough, so we can't find it, return NULL. */
-		return NULL;
-	}
+	if (required_depth > file_struct->top_level)
+		return NULL;	/* Not tall enough, so we can't find it */
 
 	/* Traverse down to level 0 */
 	while (level > 0 && tn) {
-		tn = tn->
-		    internal[(chunkId >>
-			       ( YAFFS_TNODES_LEVEL0_BITS +
-				 (level - 1) *
-				 YAFFS_TNODES_INTERNAL_BITS)
-			      ) &
-			     YAFFS_TNODES_INTERNAL_MASK];
+		tn = tn->internal[(chunk_id >>
+				   (YAFFS_TNODES_LEVEL0_BITS +
+				    (level - 1) *
+				    YAFFS_TNODES_INTERNAL_BITS)) &
+				  YAFFS_TNODES_INTERNAL_MASK];
 		level--;
-
 	}
 
 	return tn;
 }
 
-/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+/* add_find_tnode_0 finds the level 0 tnode if it exists,
+ * otherwise first expands the tree.
  * This happens in two steps:
  *  1. If the tree isn't tall enough, then make it taller.
  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
  *
  * Used when modifying the tree.
  *
- *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
- *  be plugged into the ttree.
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the
+ *  specified tn will be plugged into the ttree.
  */
 
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
-					       yaffs_FileStructure * fStruct,
-					       __u32 chunkId,
-					       yaffs_Tnode *passedTn)
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+					   struct yaffs_file_var *file_struct,
+					   u32 chunk_id,
+					   struct yaffs_tnode *passed_tn)
 {
-
-	int requiredTallness;
+	int required_depth;
 	int i;
 	int l;
-	yaffs_Tnode *tn;
-
-	__u32 x;
-
+	struct yaffs_tnode *tn;
+	u32 x;
 
 	/* Check sane level and page Id */
-	if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
+	if (file_struct->top_level < 0 ||
+	    file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
 		return NULL;
-	}
 
-	if (chunkId > YAFFS_MAX_CHUNK_ID) {
+	if (chunk_id > YAFFS_MAX_CHUNK_ID)
 		return NULL;
-	}
 
-	/* First check we're tall enough (ie enough topLevel) */
+	/* First check we're tall enough (ie enough top_level) */
 
-	x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-	requiredTallness = 0;
+	x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
 	while (x) {
 		x >>= YAFFS_TNODES_INTERNAL_BITS;
-		requiredTallness++;
+		required_depth++;
 	}
 
+	if (required_depth > file_struct->top_level) {
+		/* Not tall enough, gotta make the tree taller */
+		for (i = file_struct->top_level; i < required_depth; i++) {
 
-	if (requiredTallness > fStruct->topLevel) {
-		/* Not tall enough,gotta make the tree taller */
-		for (i = fStruct->topLevel; i < requiredTallness; i++) {
-
-			tn = yaffs_GetTnode(dev);
+			tn = yaffs_get_tnode(dev);
 
 			if (tn) {
-				tn->internal[0] = fStruct->top;
-				fStruct->top = tn;
+				tn->internal[0] = file_struct->top;
+				file_struct->top = tn;
+				file_struct->top_level++;
 			} else {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR("yaffs: no more tnodes" TENDSTR)));
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs: no more tnodes");
+				return NULL;
 			}
 		}
-
-		fStruct->topLevel = requiredTallness;
 	}
 
 	/* Traverse down to level 0, adding anything we need */
 
-	l = fStruct->topLevel;
-	tn = fStruct->top;
+	l = file_struct->top_level;
+	tn = file_struct->top;
 
-	if(l > 0) {
+	if (l > 0) {
 		while (l > 0 && tn) {
-			x = (chunkId >>
-			     ( YAFFS_TNODES_LEVEL0_BITS +
+			x = (chunk_id >>
+			     (YAFFS_TNODES_LEVEL0_BITS +
 			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
 			    YAFFS_TNODES_INTERNAL_MASK;
 
-
-			if((l>1) && !tn->internal[x]){
+			if ((l > 1) && !tn->internal[x]) {
 				/* Add missing non-level-zero tnode */
-				tn->internal[x] = yaffs_GetTnode(dev);
-
-			} else if(l == 1) {
+				tn->internal[x] = yaffs_get_tnode(dev);
+				if (!tn->internal[x])
+					return NULL;
+			} else if (l == 1) {
 				/* Looking from level 1 at level 0 */
-				if (passedTn) {
-					/* If we already have one, then release it.*/
-					if(tn->internal[x])
-						yaffs_FreeTnode(dev,tn->internal[x]);
-					tn->internal[x] = passedTn;
-
-				} else if(!tn->internal[x]) {
+				if (passed_tn) {
+					/* If we already have one, release it */
+					if (tn->internal[x])
+						yaffs_free_tnode(dev,
+							tn->internal[x]);
+					tn->internal[x] = passed_tn;
+
+				} else if (!tn->internal[x]) {
 					/* Don't have one, none passed in */
-					tn->internal[x] = yaffs_GetTnode(dev);
+					tn->internal[x] = yaffs_get_tnode(dev);
+					if (!tn->internal[x])
+						return NULL;
 				}
 			}
 
@@ -1462,2979 +947,2479 @@ static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
 		}
 	} else {
 		/* top is level 0 */
-		if(passedTn) {
-			memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
-			yaffs_FreeTnode(dev,passedTn);
+		if (passed_tn) {
+			memcpy(tn, passed_tn,
+			       (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
+			yaffs_free_tnode(dev, passed_tn);
 		}
 	}
 
 	return tn;
 }
 
-static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
-				  yaffs_ExtendedTags * tags, int objectId,
-				  int chunkInInode)
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
+			    int chunk_obj)
 {
-	int j;
+	return (tags->chunk_id == chunk_obj &&
+		tags->obj_id == obj_id &&
+		!tags->is_deleted) ? 1 : 0;
 
-	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
-		if (yaffs_CheckChunkBit
-		    (dev, theChunk / dev->nChunksPerBlock,
-		     theChunk % dev->nChunksPerBlock)) {
-			yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
-							tags);
-			if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
-				/* found it; */
-				return theChunk;
+}
 
+static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
+					struct yaffs_ext_tags *tags, int obj_id,
+					int inode_chunk)
+{
+	int j;
+
+	for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
+		if (yaffs_check_chunk_bit
+		    (dev, the_chunk / dev->param.chunks_per_block,
+		     the_chunk % dev->param.chunks_per_block)) {
+
+			if (dev->chunk_grp_size == 1)
+				return the_chunk;
+			else {
+				yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+							 tags);
+				if (yaffs_tags_match(tags,
+							obj_id, inode_chunk)) {
+					/* found it; */
+					return the_chunk;
+				}
 			}
 		}
-		theChunk++;
+		the_chunk++;
 	}
 	return -1;
 }
 
-static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
+static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+				    struct yaffs_ext_tags *tags)
 {
+	/*Get the Tnode, then get the level 0 offset chunk offset */
+	struct yaffs_tnode *tn;
+	int the_chunk = -1;
+	struct yaffs_ext_tags local_tags;
+	int ret_val = -1;
+	struct yaffs_dev *dev = in->my_dev;
 
-	yaffs_BlockInfo *theBlock;
-
-	T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
-
-	theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
-	if (theBlock) {
-		theBlock->softDeletions++;
-		dev->nFreeChunks++;
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &local_tags;
 	}
-}
-
-/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
- * All soft deleting does is increment the block's softdelete count and pulls the chunk out
- * of the tnode.
- * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
- */
-
-static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
-				  __u32 level, int chunkOffset)
-{
-	int i;
-	int theChunk;
-	int allDone = 1;
-	yaffs_Device *dev = in->myDev;
-
-	if (tn) {
-		if (level > 0) {
-
-			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
-			     i--) {
-				if (tn->internal[i]) {
-					allDone =
-					    yaffs_SoftDeleteWorker(in,
-								   tn->
-								   internal[i],
-								   level - 1,
-								   (chunkOffset
-								    <<
-								    YAFFS_TNODES_INTERNAL_BITS)
-								   + i);
-					if (allDone) {
-						yaffs_FreeTnode(dev,
-								tn->
-								internal[i]);
-						tn->internal[i] = NULL;
-					} else {
-						/* Hoosterman... how could this happen? */
-					}
-				}
-			}
-			return (allDone) ? 1 : 0;
-		} else if (level == 0) {
-
-			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
-				theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
-				if (theChunk) {
-					/* Note this does not find the real chunk, only the chunk group.
-					 * We make an assumption that a chunk group is not larger than
-					 * a block.
-					 */
-					yaffs_SoftDeleteChunk(dev, theChunk);
-					yaffs_PutLevel0Tnode(dev,tn,i,0);
-				}
-
-			}
-			return 1;
-
-		}
 
-	}
+	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
 
-	return 1;
+	if (!tn)
+		return ret_val;
 
-}
+	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
 
-static void yaffs_SoftDeleteFile(yaffs_Object * obj)
-{
-	if (obj->deleted &&
-	    obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
-		if (obj->nDataChunks <= 0) {
-			/* Empty file with no duplicate object headers, just delete it immediately */
-			yaffs_FreeTnode(obj->myDev,
-					obj->variant.fileVariant.top);
-			obj->variant.fileVariant.top = NULL;
-			T(YAFFS_TRACE_TRACING,
-			  (TSTR("yaffs: Deleting empty file %d" TENDSTR),
-			   obj->objectId));
-			yaffs_DoGenericObjectDeletion(obj);
-		} else {
-			yaffs_SoftDeleteWorker(obj,
-					       obj->variant.fileVariant.top,
-					       obj->variant.fileVariant.
-					       topLevel, 0);
-			obj->softDeleted = 1;
-		}
-	}
+	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+					      inode_chunk);
+	return ret_val;
 }
 
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- */
-
-static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
-				      __u32 level, int del0)
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+				     struct yaffs_ext_tags *tags)
 {
-	int i;
-	int hasData;
-
-	if (tn) {
-		hasData = 0;
+	/* Get the Tnode, then get the level 0 offset chunk offset */
+	struct yaffs_tnode *tn;
+	int the_chunk = -1;
+	struct yaffs_ext_tags local_tags;
+	struct yaffs_dev *dev = in->my_dev;
+	int ret_val = -1;
 
-		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
-			if (tn->internal[i] && level > 0) {
-				tn->internal[i] =
-				    yaffs_PruneWorker(dev, tn->internal[i],
-						      level - 1,
-						      (i == 0) ? del0 : 1);
-			}
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &local_tags;
+	}
 
-			if (tn->internal[i]) {
-				hasData++;
-			}
-		}
+	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
 
-		if (hasData == 0 && del0) {
-			/* Free and return NULL */
+	if (!tn)
+		return ret_val;
 
-			yaffs_FreeTnode(dev, tn);
-			tn = NULL;
-		}
+	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
 
-	}
+	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+					      inode_chunk);
 
-	return tn;
+	/* Delete the entry in the filestructure (if found) */
+	if (ret_val != -1)
+		yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
 
+	return ret_val;
 }
 
-static int yaffs_PruneFileStructure(yaffs_Device * dev,
-				    yaffs_FileStructure * fStruct)
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+			    int nand_chunk, int in_scan)
 {
-	int i;
-	int hasData;
-	int done = 0;
-	yaffs_Tnode *tn;
+	/* NB in_scan is zero unless scanning.
+	 * For forward scanning, in_scan is > 0;
+	 * for backward scanning in_scan is < 0
+	 *
+	 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
+	 */
 
-	if (fStruct->topLevel > 0) {
-		fStruct->top =
-		    yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
+	struct yaffs_tnode *tn;
+	struct yaffs_dev *dev = in->my_dev;
+	int existing_cunk;
+	struct yaffs_ext_tags existing_tags;
+	struct yaffs_ext_tags new_tags;
+	unsigned existing_serial, new_serial;
 
-		/* Now we have a tree with all the non-zero branches NULL but the height
-		 * is the same as it was.
-		 * Let's see if we can trim internal tnodes to shorten the tree.
-		 * We can do this if only the 0th element in the tnode is in use
-		 * (ie all the non-zero are NULL)
+	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
+		/* Just ignore an attempt at putting a chunk into a non-file
+		 * during scanning.
+		 * If it is not during Scanning then something went wrong!
 		 */
-
-		while (fStruct->topLevel && !done) {
-			tn = fStruct->top;
-
-			hasData = 0;
-			for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
-				if (tn->internal[i]) {
-					hasData++;
-				}
-			}
-
-			if (!hasData) {
-				fStruct->top = tn->internal[0];
-				fStruct->topLevel--;
-				yaffs_FreeTnode(dev, tn);
-			} else {
-				done = 1;
-			}
+		if (!in_scan) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy:attempt to put data chunk into a non-file"
+				);
+			BUG();
 		}
-	}
-
-	return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
 
-/* yaffs_CreateFreeObjects creates a bunch more objects and
- * adds them to the object free list.
- */
-static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
-{
-	int i;
-	yaffs_Object *newObjects;
-	yaffs_ObjectList *list;
-
-	if (nObjects < 1)
+		yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
 		return YAFFS_OK;
-
-	/* make these things */
-	newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
-	list = YMALLOC(sizeof(yaffs_ObjectList));
-
-	if (!newObjects || !list) {
-		if(newObjects)
-			YFREE(newObjects);
-		if(list)
-			YFREE(list);
-		T(YAFFS_TRACE_ALLOCATE,
-		  (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	/* Hook them into the free list */
-	for (i = 0; i < nObjects - 1; i++) {
-		newObjects[i].siblings.next =
-		    (struct list_head *)(&newObjects[i + 1]);
 	}
 
-	newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
-	dev->freeObjects = newObjects;
-	dev->nFreeObjects += nObjects;
-	dev->nObjectsCreated += nObjects;
-
-	/* Now add this bunch of Objects to a list for freeing up. */
-
-	list->objects = newObjects;
-	list->next = dev->allocatedObjectList;
-	dev->allocatedObjectList = list;
-
-	return YAFFS_OK;
-}
-
-
-/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
-static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
-{
-	yaffs_Object *tn = NULL;
-
-	/* If there are none left make more */
-	if (!dev->freeObjects) {
-		yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
-	}
-
-	if (dev->freeObjects) {
-		tn = dev->freeObjects;
-		dev->freeObjects =
-		    (yaffs_Object *) (dev->freeObjects->siblings.next);
-		dev->nFreeObjects--;
+	tn = yaffs_add_find_tnode_0(dev,
+				    &in->variant.file_variant,
+				    inode_chunk, NULL);
+	if (!tn)
+		return YAFFS_FAIL;
 
-		/* Now sweeten it up... */
+	if (!nand_chunk)
+		/* Dummy insert, bail now */
+		return YAFFS_OK;
 
-		memset(tn, 0, sizeof(yaffs_Object));
-		tn->myDev = dev;
-		tn->chunkId = -1;
-		tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
-		INIT_LIST_HEAD(&(tn->hardLinks));
-		INIT_LIST_HEAD(&(tn->hashLink));
-		INIT_LIST_HEAD(&tn->siblings);
+	existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
 
-		/* Add it to the lost and found directory.
-		 * NB Can't put root or lostNFound in lostNFound so
-		 * check if lostNFound exists first
+	if (in_scan != 0) {
+		/* If we're scanning then we need to test for duplicates
+		 * NB This does not need to be efficient since it should only
+		 * happen when the power fails during a write, then only one
+		 * chunk should ever be affected.
+		 *
+		 * Correction for YAFFS2: This could happen quite a lot and we
+		 * need to think about efficiency! TODO
+		 * Update: For backward scanning we don't need to re-read tags
+		 * so this is quite cheap.
 		 */
-		if (dev->lostNFoundDir) {
-			yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
-		}
-	}
 
-	return tn;
-}
-
-static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
-					       __u32 mode)
-{
+		if (existing_cunk > 0) {
+			/* NB Right now existing chunk will not be real
+			 * chunk_id if the chunk group size > 1
+			 * thus we have to do a FindChunkInFile to get the
+			 * real chunk id.
+			 *
+			 * We have a duplicate now we need to decide which
+			 * one to use:
+			 *
+			 * Backwards scanning YAFFS2: The old one is what
+			 * we use, dump the new one.
+			 * YAFFS1: Get both sets of tags and compare serial
+			 * numbers.
+			 */
 
-	yaffs_Object *obj =
-	    yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
-	if (obj) {
-		obj->fake = 1;		/* it is fake so it has no NAND presence... */
-		obj->renameAllowed = 0;	/* ... and we're not allowed to rename it... */
-		obj->unlinkAllowed = 0;	/* ... or unlink it */
-		obj->deleted = 0;
-		obj->unlinked = 0;
-		obj->yst_mode = mode;
-		obj->myDev = dev;
-		obj->chunkId = 0;	/* Not a valid chunk. */
-	}
+			if (in_scan > 0) {
+				/* Only do this for forward scanning */
+				yaffs_rd_chunk_tags_nand(dev,
+							 nand_chunk,
+							 NULL, &new_tags);
 
-	return obj;
+				/* Do a proper find */
+				existing_cunk =
+				    yaffs_find_chunk_in_file(in, inode_chunk,
+							     &existing_tags);
+			}
 
-}
+			if (existing_cunk <= 0) {
+				/*Hoosterman - how did this happen? */
 
-static void yaffs_UnhashObject(yaffs_Object * tn)
-{
-	int bucket;
-	yaffs_Device *dev = tn->myDev;
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs tragedy: existing chunk < 0 in scan"
+					);
 
-	/* If it is still linked into the bucket list, free from the list */
-	if (!list_empty(&tn->hashLink)) {
-		list_del_init(&tn->hashLink);
-		bucket = yaffs_HashFunction(tn->objectId);
-		dev->objectBucket[bucket].count--;
-	}
+			}
 
-}
+			/* NB The deleted flags should be false, otherwise
+			 * the chunks will not be loaded during a scan
+			 */
 
-/*  FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_FreeObject(yaffs_Object * tn)
-{
+			if (in_scan > 0) {
+				new_serial = new_tags.serial_number;
+				existing_serial = existing_tags.serial_number;
+			}
 
-	yaffs_Device *dev = tn->myDev;
+			if ((in_scan > 0) &&
+			    (existing_cunk <= 0 ||
+			     ((existing_serial + 1) & 3) == new_serial)) {
+				/* Forward scanning.
+				 * Use new
+				 * Delete the old one and drop through to
+				 * update the tnode
+				 */
+				yaffs_chunk_del(dev, existing_cunk, 1,
+						__LINE__);
+			} else {
+				/* Backward scanning or we want to use the
+				 * existing one
+				 * Delete the new one and return early so that
+				 * the tnode isn't changed
+				 */
+				yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+				return YAFFS_OK;
+			}
+		}
 
-/* XXX U-BOOT XXX */
-#if 0
-#ifdef  __KERNEL__
-	if (tn->myInode) {
-		/* We're still hooked up to a cached inode.
-		 * Don't delete now, but mark for later deletion
-		 */
-		tn->deferedFree = 1;
-		return;
 	}
-#endif
-#endif
-	yaffs_UnhashObject(tn);
 
-	/* Link into the free list. */
-	tn->siblings.next = (struct list_head *)(dev->freeObjects);
-	dev->freeObjects = tn;
-	dev->nFreeObjects++;
-}
+	if (existing_cunk == 0)
+		in->n_data_chunks++;
 
-/* XXX U-BOOT XXX */
-#if 0
-#ifdef __KERNEL__
+	yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
 
-void yaffs_HandleDeferedFree(yaffs_Object * obj)
-{
-	if (obj->deferedFree) {
-		yaffs_FreeObject(obj);
-	}
+	return YAFFS_OK;
 }
 
-#endif
-#endif
-
-static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
+static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
 {
-	/* Free the list of allocated Objects */
+	struct yaffs_block_info *the_block;
+	unsigned block_no;
 
-	yaffs_ObjectList *tmp;
+	yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
 
-	while (dev->allocatedObjectList) {
-		tmp = dev->allocatedObjectList->next;
-		YFREE(dev->allocatedObjectList->objects);
-		YFREE(dev->allocatedObjectList);
-
-		dev->allocatedObjectList = tmp;
+	block_no = chunk / dev->param.chunks_per_block;
+	the_block = yaffs_get_block_info(dev, block_no);
+	if (the_block) {
+		the_block->soft_del_pages++;
+		dev->n_free_chunks++;
+		yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
 	}
-
-	dev->freeObjects = NULL;
-	dev->nFreeObjects = 0;
 }
 
-static void yaffs_InitialiseObjects(yaffs_Device * dev)
-{
-	int i;
-
-	dev->allocatedObjectList = NULL;
-	dev->freeObjects = NULL;
-	dev->nFreeObjects = 0;
-
-	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
-		INIT_LIST_HEAD(&dev->objectBucket[i].list);
-		dev->objectBucket[i].count = 0;
-	}
-
-}
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
+ * the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls
+ * the chunk out of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks
+ * are soft deleted.
+ */
 
-static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
+static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
+				 u32 level, int chunk_offset)
 {
-	static int x = 0;
 	int i;
-	int l = 999;
-	int lowest = 999999;
+	int the_chunk;
+	int all_done = 1;
+	struct yaffs_dev *dev = in->my_dev;
 
-	/* First let's see if we can find one that's empty. */
+	if (!tn)
+		return 1;
 
-	for (i = 0; i < 10 && lowest > 0; i++) {
-		x++;
-		x %= YAFFS_NOBJECT_BUCKETS;
-		if (dev->objectBucket[x].count < lowest) {
-			lowest = dev->objectBucket[x].count;
-			l = x;
+	if (level > 0) {
+		for (i = YAFFS_NTNODES_INTERNAL - 1;
+			all_done && i >= 0;
+			i--) {
+			if (tn->internal[i]) {
+				all_done =
+				    yaffs_soft_del_worker(in,
+					tn->internal[i],
+					level - 1,
+					(chunk_offset <<
+					YAFFS_TNODES_INTERNAL_BITS)
+					+ i);
+				if (all_done) {
+					yaffs_free_tnode(dev,
+						tn->internal[i]);
+					tn->internal[i] = NULL;
+				} else {
+					/* Can this happen? */
+				}
+			}
 		}
-
+		return (all_done) ? 1 : 0;
 	}
 
-	/* If we didn't find an empty list, then try
-	 * looking a bit further for a short one
-	 */
-
-	for (i = 0; i < 10 && lowest > 3; i++) {
-		x++;
-		x %= YAFFS_NOBJECT_BUCKETS;
-		if (dev->objectBucket[x].count < lowest) {
-			lowest = dev->objectBucket[x].count;
-			l = x;
+	/* level 0 */
+	 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+		the_chunk = yaffs_get_group_base(dev, tn, i);
+		if (the_chunk) {
+			yaffs_soft_del_chunk(dev, the_chunk);
+			yaffs_load_tnode_0(dev, tn, i, 0);
 		}
-
 	}
-
-	return l;
+	return 1;
 }
 
-static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
 {
-	int bucket = yaffs_FindNiceObjectBucket(dev);
+	struct yaffs_dev *dev = obj->my_dev;
+	struct yaffs_obj *parent;
 
-	/* Now find an object value that has not already been taken
-	 * by scanning the list.
-	 */
+	yaffs_verify_obj_in_dir(obj);
+	parent = obj->parent;
 
-	int found = 0;
-	struct list_head *i;
+	yaffs_verify_dir(parent);
 
-	__u32 n = (__u32) bucket;
+	if (dev && dev->param.remove_obj_fn)
+		dev->param.remove_obj_fn(obj);
 
-	/* yaffs_CheckObjectHashSanity();  */
-
-	while (!found) {
-		found = 1;
-		n += YAFFS_NOBJECT_BUCKETS;
-		if (1 || dev->objectBucket[bucket].count > 0) {
-			list_for_each(i, &dev->objectBucket[bucket].list) {
-				/* If there is already one in the list */
-				if (i
-				    && list_entry(i, yaffs_Object,
-						  hashLink)->objectId == n) {
-					found = 0;
-				}
-			}
-		}
-	}
-
-
-	return n;
-}
-
-static void yaffs_HashObject(yaffs_Object * in)
-{
-	int bucket = yaffs_HashFunction(in->objectId);
-	yaffs_Device *dev = in->myDev;
-
-	list_add(&in->hashLink, &dev->objectBucket[bucket].list);
-	dev->objectBucket[bucket].count++;
+	list_del_init(&obj->siblings);
+	obj->parent = NULL;
 
+	yaffs_verify_dir(parent);
 }
 
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
 {
-	int bucket = yaffs_HashFunction(number);
-	struct list_head *i;
-	yaffs_Object *in;
-
-	list_for_each(i, &dev->objectBucket[bucket].list) {
-		/* Look if it is in the list */
-		if (i) {
-			in = list_entry(i, yaffs_Object, hashLink);
-			if (in->objectId == number) {
-/* XXX U-BOOT XXX */
-#if 0
-#ifdef __KERNEL__
-				/* Don't tell the VFS about this one if it is defered free */
-				if (in->deferedFree)
-					return NULL;
-#endif
-#endif
-				return in;
-			}
-		}
+	if (!directory) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: Trying to add an object to a null pointer directory"
+			);
+		BUG();
+		return;
 	}
-
-	return NULL;
-}
-
-yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
-				    yaffs_ObjectType type)
-{
-
-	yaffs_Object *theObject;
-	yaffs_Tnode *tn = NULL;
-
-	if (number < 0) {
-		number = yaffs_CreateNewObjectNumber(dev);
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: Trying to add an object to a non-directory"
+			);
+		BUG();
 	}
 
-	theObject = yaffs_AllocateEmptyObject(dev);
-	if(!theObject)
-		return NULL;
-
-	if(type == YAFFS_OBJECT_TYPE_FILE){
-		tn = yaffs_GetTnode(dev);
-		if(!tn){
-			yaffs_FreeObject(theObject);
-			return NULL;
-		}
+	if (obj->siblings.prev == NULL) {
+		/* Not initialised */
+		BUG();
 	}
 
+	yaffs_verify_dir(directory);
 
+	yaffs_remove_obj_from_dir(obj);
 
-	if (theObject) {
-		theObject->fake = 0;
-		theObject->renameAllowed = 1;
-		theObject->unlinkAllowed = 1;
-		theObject->objectId = number;
-		yaffs_HashObject(theObject);
-		theObject->variantType = type;
-#ifdef CONFIG_YAFFS_WINCE
-		yfsd_WinFileTimeNow(theObject->win_atime);
-		theObject->win_ctime[0] = theObject->win_mtime[0] =
-		    theObject->win_atime[0];
-		theObject->win_ctime[1] = theObject->win_mtime[1] =
-		    theObject->win_atime[1];
-
-#else
+	/* Now add it */
+	list_add(&obj->siblings, &directory->variant.dir_variant.children);
+	obj->parent = directory;
 
-		theObject->yst_atime = theObject->yst_mtime =
-		    theObject->yst_ctime = Y_CURRENT_TIME;
-#endif
-		switch (type) {
-		case YAFFS_OBJECT_TYPE_FILE:
-			theObject->variant.fileVariant.fileSize = 0;
-			theObject->variant.fileVariant.scannedFileSize = 0;
-			theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF;	/* max __u32 */
-			theObject->variant.fileVariant.topLevel = 0;
-			theObject->variant.fileVariant.top = tn;
-			break;
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			INIT_LIST_HEAD(&theObject->variant.directoryVariant.
-				       children);
-			break;
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-			/* No action required */
-			break;
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-			/* todo this should not happen */
-			break;
-		}
+	if (directory == obj->my_dev->unlinked_dir
+	    || directory == obj->my_dev->del_dir) {
+		obj->unlinked = 1;
+		obj->my_dev->n_unlinked_files++;
+		obj->rename_allowed = 0;
 	}
 
-	return theObject;
+	yaffs_verify_dir(directory);
+	yaffs_verify_obj_in_dir(obj);
 }
 
-static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
-						      int number,
-						      yaffs_ObjectType type)
+static int yaffs_change_obj_name(struct yaffs_obj *obj,
+				 struct yaffs_obj *new_dir,
+				 const YCHAR *new_name, int force, int shadows)
 {
-	yaffs_Object *theObject = NULL;
+	int unlink_op;
+	int del_op;
+	struct yaffs_obj *existing_target;
 
-	if (number > 0) {
-		theObject = yaffs_FindObjectByNumber(dev, number);
-	}
+	if (new_dir == NULL)
+		new_dir = obj->parent;	/* use the old directory */
 
-	if (!theObject) {
-		theObject = yaffs_CreateNewObject(dev, number, type);
+	if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_change_obj_name: new_dir is not a directory"
+			);
+		BUG();
 	}
 
-	return theObject;
+	unlink_op = (new_dir == obj->my_dev->unlinked_dir);
+	del_op = (new_dir == obj->my_dev->del_dir);
 
-}
+	existing_target = yaffs_find_by_name(new_dir, new_name);
 
+	/* If the object is a file going into the unlinked directory,
+	 *   then it is OK to just stuff it in since duplicate names are OK.
+	 *   else only proceed if the new name does not exist and we're putting
+	 *   it into a directory.
+	 */
+	if (!(unlink_op || del_op || force ||
+	      shadows > 0 || !existing_target) ||
+	      new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		return YAFFS_FAIL;
 
-static YCHAR *yaffs_CloneString(const YCHAR * str)
-{
-	YCHAR *newStr = NULL;
+	yaffs_set_obj_name(obj, new_name);
+	obj->dirty = 1;
+	yaffs_add_obj_to_dir(new_dir, obj);
 
-	if (str && *str) {
-		newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
-		if(newStr)
-			yaffs_strcpy(newStr, str);
-	}
+	if (unlink_op)
+		obj->unlinked = 1;
 
-	return newStr;
+	/* If it is a deletion then we mark it as a shrink for gc  */
+	if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
+		return YAFFS_OK;
 
+	return YAFFS_FAIL;
 }
 
-/*
- * Mknod (create) a new object.
- * equivalentObject only has meaning for a hard link;
- * aliasString only has meaning for a sumlink.
- * rdev only has meaning for devices (a subset of special objects)
+/*------------------------ Short Operations Cache ------------------------------
+ *   In many situations where there is no high level buffering  a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance
+ *   benefit with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering and the short op cache
+ *   provides write buffering.
+ *
+ *   There are a small number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
  */
 
-static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
-				       yaffs_Object * parent,
-				       const YCHAR * name,
-				       __u32 mode,
-				       __u32 uid,
-				       __u32 gid,
-				       yaffs_Object * equivalentObject,
-				       const YCHAR * aliasString, __u32 rdev)
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
 {
-	yaffs_Object *in;
-	YCHAR *str = NULL;
-
-	yaffs_Device *dev = parent->myDev;
-
-	/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
-	if (yaffs_FindObjectByName(parent, name)) {
-		return NULL;
-	}
-
-	in = yaffs_CreateNewObject(dev, -1, type);
+	struct yaffs_dev *dev = obj->my_dev;
+	int i;
+	struct yaffs_cache *cache;
+	int n_caches = obj->my_dev->param.n_caches;
 
-	if(type == YAFFS_OBJECT_TYPE_SYMLINK){
-		str = yaffs_CloneString(aliasString);
-		if(!str){
-			yaffs_FreeObject(in);
-			return NULL;
-		}
+	for (i = 0; i < n_caches; i++) {
+		cache = &dev->cache[i];
+		if (cache->object == obj && cache->dirty)
+			return 1;
 	}
 
+	return 0;
+}
 
+static void yaffs_flush_file_cache(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	int lowest = -99;	/* Stop compiler whining. */
+	int i;
+	struct yaffs_cache *cache;
+	int chunk_written = 0;
+	int n_caches = obj->my_dev->param.n_caches;
 
-	if (in) {
-		in->chunkId = -1;
-		in->valid = 1;
-		in->variantType = type;
-
-		in->yst_mode = mode;
-
-#ifdef CONFIG_YAFFS_WINCE
-		yfsd_WinFileTimeNow(in->win_atime);
-		in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
-		in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
-
-#else
-		in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
-
-		in->yst_rdev = rdev;
-		in->yst_uid = uid;
-		in->yst_gid = gid;
-#endif
-		in->nDataChunks = 0;
-
-		yaffs_SetObjectName(in, name);
-		in->dirty = 1;
-
-		yaffs_AddObjectToDirectory(parent, in);
-
-		in->myDev = parent->myDev;
-
-		switch (type) {
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-			in->variant.symLinkVariant.alias = str;
-			break;
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-			in->variant.hardLinkVariant.equivalentObject =
-			    equivalentObject;
-			in->variant.hardLinkVariant.equivalentObjectId =
-			    equivalentObject->objectId;
-			list_add(&in->hardLinks, &equivalentObject->hardLinks);
-			break;
-		case YAFFS_OBJECT_TYPE_FILE:
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-			/* do nothing */
-			break;
+	if (n_caches < 1)
+		return;
+	do {
+		cache = NULL;
+
+		/* Find the lowest dirty chunk for this object */
+		for (i = 0; i < n_caches; i++) {
+			if (dev->cache[i].object == obj &&
+			    dev->cache[i].dirty) {
+				if (!cache ||
+				    dev->cache[i].chunk_id < lowest) {
+					cache = &dev->cache[i];
+					lowest = cache->chunk_id;
+				}
+			}
 		}
 
-		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
-			/* Could not create the object header, fail the creation */
-			yaffs_DestroyObject(in);
-			in = NULL;
+		if (cache && !cache->locked) {
+			/* Write it out and free it up */
+			chunk_written =
+			    yaffs_wr_data_obj(cache->object,
+					      cache->chunk_id,
+					      cache->data,
+					      cache->n_bytes, 1);
+			cache->dirty = 0;
+			cache->object = NULL;
 		}
+	} while (cache && chunk_written > 0);
 
-	}
-
-	return in;
+	if (cache)
+		/* Hoosterman, disk full while writing cache out. */
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"yaffs tragedy: no space during cache write");
 }
 
-yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
-			      __u32 mode, __u32 uid, __u32 gid)
-{
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
-				 uid, gid, NULL, NULL, 0);
-}
+/*yaffs_flush_whole_cache(dev)
+ *
+ *
+ */
 
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
-				   __u32 mode, __u32 uid, __u32 gid)
+void yaffs_flush_whole_cache(struct yaffs_dev *dev)
 {
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
-				 mode, uid, gid, NULL, NULL, 0);
-}
+	struct yaffs_obj *obj;
+	int n_caches = dev->param.n_caches;
+	int i;
 
-yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
-				 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
-{
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
-				 uid, gid, NULL, NULL, rdev);
-}
+	/* Find a dirty object in the cache and flush it...
+	 * until there are no further dirty objects.
+	 */
+	do {
+		obj = NULL;
+		for (i = 0; i < n_caches && !obj; i++) {
+			if (dev->cache[i].object && dev->cache[i].dirty)
+				obj = dev->cache[i].object;
+		}
+		if (obj)
+			yaffs_flush_file_cache(obj);
+	} while (obj);
 
-yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
-				 __u32 mode, __u32 uid, __u32 gid,
-				 const YCHAR * alias)
-{
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
-				 uid, gid, NULL, alias, 0);
 }
 
-/* yaffs_Link returns the object id of the equivalent object.*/
-yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
-			 yaffs_Object * equivalentObject)
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
 {
-	/* Get the real object in case we were fed a hard link as an equivalent object */
-	equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
+	int i;
 
-	if (yaffs_MknodObject
-	    (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
-	     equivalentObject, NULL, 0)) {
-		return equivalentObject;
-	} else {
-		return NULL;
+	if (dev->param.n_caches > 0) {
+		for (i = 0; i < dev->param.n_caches; i++) {
+			if (!dev->cache[i].object)
+				return &dev->cache[i];
+		}
 	}
-
+	return NULL;
 }
 
-static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
-				  const YCHAR * newName, int force, int shadows)
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
 {
-	int unlinkOp;
-	int deleteOp;
-
-	yaffs_Object *existingTarget;
-
-	if (newDir == NULL) {
-		newDir = obj->parent;	/* use the old directory */
-	}
-
-	if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
-		    TENDSTR)));
-		YBUG();
-	}
-
-	/* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
-	if (obj->myDev->isYaffs2) {
-		unlinkOp = (newDir == obj->myDev->unlinkedDir);
-	} else {
-		unlinkOp = (newDir == obj->myDev->unlinkedDir
-			    && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
-	}
+	struct yaffs_cache *cache;
+	struct yaffs_obj *the_obj;
+	int usage;
+	int i;
+	int pushout;
 
-	deleteOp = (newDir == obj->myDev->deletedDir);
+	if (dev->param.n_caches < 1)
+		return NULL;
 
-	existingTarget = yaffs_FindObjectByName(newDir, newName);
+	/* Try find a non-dirty one... */
 
-	/* If the object is a file going into the unlinked directory,
-	 *   then it is OK to just stuff it in since duplicate names are allowed.
-	 *   else only proceed if the new name does not exist and if we're putting
-	 *   it into a directory.
-	 */
-	if ((unlinkOp ||
-	     deleteOp ||
-	     force ||
-	     (shadows > 0) ||
-	     !existingTarget) &&
-	    newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_SetObjectName(obj, newName);
-		obj->dirty = 1;
+	cache = yaffs_grab_chunk_worker(dev);
 
-		yaffs_AddObjectToDirectory(newDir, obj);
+	if (!cache) {
+		/* They were all dirty, find the LRU object and flush
+		 * its cache, then  find again.
+		 * NB what's here is not very accurate,
+		 * we actually flush the object with the LRU chunk.
+		 */
 
-		if (unlinkOp)
-			obj->unlinked = 1;
+		/* With locking we can't assume we can use entry zero,
+		 * Set the_obj to a valid pointer for Coverity. */
+		the_obj = dev->cache[0].object;
+		usage = -1;
+		cache = NULL;
+		pushout = -1;
+
+		for (i = 0; i < dev->param.n_caches; i++) {
+			if (dev->cache[i].object &&
+			    !dev->cache[i].locked &&
+			    (dev->cache[i].last_use < usage ||
+			    !cache)) {
+				usage = dev->cache[i].last_use;
+				the_obj = dev->cache[i].object;
+				cache = &dev->cache[i];
+				pushout = i;
+			}
+		}
 
-		/* If it is a deletion then we mark it as a shrink for gc purposes. */
-		if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
-			return YAFFS_OK;
+		if (!cache || cache->dirty) {
+			/* Flush and try again */
+			yaffs_flush_file_cache(the_obj);
+			cache = yaffs_grab_chunk_worker(dev);
+		}
 	}
-
-	return YAFFS_FAIL;
+	return cache;
 }
 
-int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
-		       yaffs_Object * newDir, const YCHAR * newName)
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+						  int chunk_id)
 {
-	yaffs_Object *obj;
-	yaffs_Object *existingTarget;
-	int force = 0;
+	struct yaffs_dev *dev = obj->my_dev;
+	int i;
 
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-	/* Special case for case insemsitive systems (eg. WinCE).
-	 * While look-up is case insensitive, the name isn't.
-	 * Therefore we might want to change x.txt to X.txt
-	*/
-	if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
-		force = 1;
-	}
-#endif
+	if (dev->param.n_caches < 1)
+		return NULL;
 
-	obj = yaffs_FindObjectByName(oldDir, oldName);
-	/* Check new name to long. */
-	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
-	    yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
-	  /* ENAMETOOLONG */
-	  return YAFFS_FAIL;
-	else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
-		 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
-	  /* ENAMETOOLONG */
-	  return YAFFS_FAIL;
-
-	if (obj && obj->renameAllowed) {
-
-		/* Now do the handling for an existing target, if there is one */
-
-		existingTarget = yaffs_FindObjectByName(newDir, newName);
-		if (existingTarget &&
-		    existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
-		    !list_empty(&existingTarget->variant.directoryVariant.children)) {
-			/* There is a target that is a non-empty directory, so we fail */
-			return YAFFS_FAIL;	/* EEXIST or ENOTEMPTY */
-		} else if (existingTarget && existingTarget != obj) {
-			/* Nuke the target first, using shadowing,
-			 * but only if it isn't the same object
-			 */
-			yaffs_ChangeObjectName(obj, newDir, newName, force,
-					       existingTarget->objectId);
-			yaffs_UnlinkObject(existingTarget);
-		}
+	for (i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].object == obj &&
+		    dev->cache[i].chunk_id == chunk_id) {
+			dev->cache_hits++;
 
-		return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
+			return &dev->cache[i];
+		}
 	}
-	return YAFFS_FAIL;
+	return NULL;
 }
 
-/*------------------------- Block Management and Page Allocation ----------------*/
-
-static int yaffs_InitialiseBlocks(yaffs_Device * dev)
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
+			    int is_write)
 {
-	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
-	dev->blockInfo = NULL;
-	dev->chunkBits = NULL;
-
-	dev->allocationBlock = -1;	/* force it to get a new one */
+	int i;
 
-	/* If the first allocation strategy fails, thry the alternate one */
-	dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
-	if(!dev->blockInfo){
-		dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
-		dev->blockInfoAlt = 1;
-	}
-	else
-		dev->blockInfoAlt = 0;
+	if (dev->param.n_caches < 1)
+		return;
 
-	if(dev->blockInfo){
+	if (dev->cache_last_use < 0 ||
+		dev->cache_last_use > 100000000) {
+		/* Reset the cache usages */
+		for (i = 1; i < dev->param.n_caches; i++)
+			dev->cache[i].last_use = 0;
 
-		/* Set up dynamic blockinfo stuff. */
-		dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
-		dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
-		if(!dev->chunkBits){
-			dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
-			dev->chunkBitsAlt = 1;
-		}
-		else
-			dev->chunkBitsAlt = 0;
+		dev->cache_last_use = 0;
 	}
+	dev->cache_last_use++;
+	cache->last_use = dev->cache_last_use;
 
-	if (dev->blockInfo && dev->chunkBits) {
-		memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
-		memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
-		return YAFFS_OK;
-	}
-
-	return YAFFS_FAIL;
-
+	if (is_write)
+		cache->dirty = 1;
 }
 
-static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
 {
-	if(dev->blockInfoAlt && dev->blockInfo)
-		YFREE_ALT(dev->blockInfo);
-	else if(dev->blockInfo)
-		YFREE(dev->blockInfo);
+	struct yaffs_cache *cache;
 
-	dev->blockInfoAlt = 0;
+	if (object->my_dev->param.n_caches > 0) {
+		cache = yaffs_find_chunk_cache(object, chunk_id);
 
-	dev->blockInfo = NULL;
-
-	if(dev->chunkBitsAlt && dev->chunkBits)
-		YFREE_ALT(dev->chunkBits);
-	else if(dev->chunkBits)
-		YFREE(dev->chunkBits);
-	dev->chunkBitsAlt = 0;
-	dev->chunkBits = NULL;
+		if (cache)
+			cache->object = NULL;
+	}
 }
 
-static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
-					    yaffs_BlockInfo * bi)
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
 {
 	int i;
-	__u32 seq;
-	yaffs_BlockInfo *b;
-
-	if (!dev->isYaffs2)
-		return 1;	/* disqualification only applies to yaffs2. */
+	struct yaffs_dev *dev = in->my_dev;
 
-	if (!bi->hasShrinkHeader)
-		return 1;	/* can gc */
-
-	/* Find the oldest dirty sequence number if we don't know it and save it
-	 * so we don't have to keep recomputing it.
-	 */
-	if (!dev->oldestDirtySequence) {
-		seq = dev->sequenceNumber;
-
-		for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
-		     i++) {
-			b = yaffs_GetBlockInfo(dev, i);
-			if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
-			    (b->pagesInUse - b->softDeletions) <
-			    dev->nChunksPerBlock && b->sequenceNumber < seq) {
-				seq = b->sequenceNumber;
-			}
+	if (dev->param.n_caches > 0) {
+		/* Invalidate it. */
+		for (i = 0; i < dev->param.n_caches; i++) {
+			if (dev->cache[i].object == in)
+				dev->cache[i].object = NULL;
 		}
-		dev->oldestDirtySequence = seq;
 	}
-
-	/* Can't do gc of this block if there are any blocks older than this one that have
-	 * discarded pages.
-	 */
-	return (bi->sequenceNumber <= dev->oldestDirtySequence);
-
 }
 
-/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
-					       int aggressive)
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
 {
+	int bucket;
+	struct yaffs_dev *dev = obj->my_dev;
 
-	int b = dev->currentDirtyChecker;
-
-	int i;
-	int iterations;
-	int dirtiest = -1;
-	int pagesInUse = 0;
-	int prioritised=0;
-	yaffs_BlockInfo *bi;
-	int pendingPrioritisedExist = 0;
-
-	/* First let's see if we need to grab a prioritised block */
-	if(dev->hasPendingPrioritisedGCs){
-		for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
-
-			bi = yaffs_GetBlockInfo(dev, i);
-			//yaffs_VerifyBlock(dev,bi,i);
-
-			if(bi->gcPrioritise) {
-				pendingPrioritisedExist = 1;
-				if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-				   yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
-					pagesInUse = (bi->pagesInUse - bi->softDeletions);
-					dirtiest = i;
-					prioritised = 1;
-					aggressive = 1; /* Fool the non-aggressive skip logiv below */
-				}
-			}
-		}
-
-		if(!pendingPrioritisedExist) /* None found, so we can clear this */
-			dev->hasPendingPrioritisedGCs = 0;
+	/* If it is still linked into the bucket list, free from the list */
+	if (!list_empty(&obj->hash_link)) {
+		list_del_init(&obj->hash_link);
+		bucket = yaffs_hash_fn(obj->obj_id);
+		dev->obj_bucket[bucket].count--;
 	}
+}
 
-	/* If we're doing aggressive GC then we are happy to take a less-dirty block, and
-	 * search harder.
-	 * else (we're doing a leasurely gc), then we only bother to do this if the
-	 * block has only a few pages in use.
-	 */
-
-	dev->nonAggressiveSkip--;
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_free_obj(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
 
-	if (!aggressive && (dev->nonAggressiveSkip > 0)) {
-		return -1;
+	if (!obj) {
+		BUG();
+		return;
 	}
+	dev = obj->my_dev;
+	yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
+		obj, obj->my_inode);
+	if (obj->parent)
+		BUG();
+	if (!list_empty(&obj->siblings))
+		BUG();
 
-	if(!prioritised)
-		pagesInUse =
-			(aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
-
-	if (aggressive) {
-		iterations =
-		    dev->internalEndBlock - dev->internalStartBlock + 1;
-	} else {
-		iterations =
-		    dev->internalEndBlock - dev->internalStartBlock + 1;
-		iterations = iterations / 16;
-		if (iterations > 200) {
-			iterations = 200;
-		}
+	if (obj->my_inode) {
+		/* We're still hooked up to a cached inode.
+		 * Don't delete now, but mark for later deletion
+		 */
+		obj->defered_free = 1;
+		return;
 	}
 
-	for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
-		b++;
-		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
-			b = dev->internalStartBlock;
-		}
+	yaffs_unhash_obj(obj);
 
-		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
-			T(YAFFS_TRACE_ERROR,
-			  (TSTR("**>> Block %d is not valid" TENDSTR), b));
-			YBUG();
-		}
+	yaffs_free_raw_obj(dev, obj);
+	dev->n_obj--;
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
 
-		bi = yaffs_GetBlockInfo(dev, b);
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
+{
+	if (obj->defered_free)
+		yaffs_free_obj(obj);
+}
 
-#if 0
-		if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
-			dirtiest = b;
-			pagesInUse = 0;
-		}
-		else
-#endif
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
+{
+	/* Iinvalidate the file's data in the cache, without flushing. */
+	yaffs_invalidate_whole_cache(in);
 
-		if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-		       (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
-			yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
-			dirtiest = b;
-			pagesInUse = (bi->pagesInUse - bi->softDeletions);
-		}
+	if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
+		/* Move to unlinked directory so we have a deletion record */
+		yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
+				      0);
 	}
 
-	dev->currentDirtyChecker = b;
+	yaffs_remove_obj_from_dir(in);
+	yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
+	in->hdr_chunk = 0;
 
-	if (dirtiest > 0) {
-		T(YAFFS_TRACE_GC,
-		  (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
-		   dev->nChunksPerBlock - pagesInUse,prioritised));
-	}
+	yaffs_free_obj(in);
+	return YAFFS_OK;
 
-	dev->oldestDirtySequence = 0;
+}
 
-	if (dirtiest > 0) {
-		dev->nonAggressiveSkip = 4;
-	}
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
+{
+	if (!obj->deleted ||
+	    obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
+	    obj->soft_del)
+		return;
 
-	return dirtiest;
+	if (obj->n_data_chunks <= 0) {
+		/* Empty file with no duplicate object headers,
+		 * just delete it immediately */
+		yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
+		obj->variant.file_variant.top = NULL;
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"yaffs: Deleting empty file %d",
+			obj->obj_id);
+		yaffs_generic_obj_del(obj);
+	} else {
+		yaffs_soft_del_worker(obj,
+				      obj->variant.file_variant.top,
+				      obj->variant.
+				      file_variant.top_level, 0);
+		obj->soft_del = 1;
+	}
 }
 
-static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+					      struct yaffs_tnode *tn, u32 level,
+					      int del0)
 {
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
+	int i;
+	int has_data;
 
-	int erasedOk = 0;
+	if (!tn)
+		return tn;
 
-	/* If the block is still healthy erase it and mark as clean.
-	 * If the block has had a data failure, then retire it.
-	 */
-
-	T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
-		(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
-		blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
+	has_data = 0;
 
-	bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+	if (level > 0) {
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i]) {
+				tn->internal[i] =
+				    yaffs_prune_worker(dev,
+						tn->internal[i],
+						level - 1,
+						(i == 0) ? del0 : 1);
+			}
 
-	if (!bi->needsRetiring) {
-		yaffs_InvalidateCheckpoint(dev);
-		erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
-		if (!erasedOk) {
-			dev->nErasureFailures++;
-			T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-			  (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
+			if (tn->internal[i])
+				has_data++;
 		}
-	}
+	} else {
+		int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+		u32 *map = (u32 *) tn;
 
-	if (erasedOk &&
-	    ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
-		int i;
-		for (i = 0; i < dev->nChunksPerBlock; i++) {
-			if (!yaffs_CheckChunkErased
-			    (dev, blockNo * dev->nChunksPerBlock + i)) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   (">>Block %d erasure supposedly OK, but chunk %d not erased"
-				    TENDSTR), blockNo, i));
-			}
+		for (i = 0; !has_data && i < tnode_size_u32; i++) {
+			if (map[i])
+				has_data++;
 		}
 	}
 
-	if (erasedOk) {
-		/* Clean it up... */
-		bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
-		dev->nErasedBlocks++;
-		bi->pagesInUse = 0;
-		bi->softDeletions = 0;
-		bi->hasShrinkHeader = 0;
-		bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
-		bi->gcPrioritise = 0;
-		yaffs_ClearChunkBits(dev, blockNo);
-
-		T(YAFFS_TRACE_ERASE,
-		  (TSTR("Erased block %d" TENDSTR), blockNo));
-	} else {
-		dev->nFreeChunks -= dev->nChunksPerBlock;	/* We lost a block of free space */
-
-		yaffs_RetireBlock(dev, blockNo);
-		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-		  (TSTR("**>> Block %d retired" TENDSTR), blockNo));
+	if (has_data == 0 && del0) {
+		/* Free and return NULL */
+		yaffs_free_tnode(dev, tn);
+		tn = NULL;
 	}
+	return tn;
 }
 
-static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+			    struct yaffs_file_var *file_struct)
 {
 	int i;
+	int has_data;
+	int done = 0;
+	struct yaffs_tnode *tn;
 
-	yaffs_BlockInfo *bi;
+	if (file_struct->top_level < 1)
+		return YAFFS_OK;
 
-	if (dev->nErasedBlocks < 1) {
-		/* Hoosterman we've got a problem.
-		 * Can't get space to gc
-		 */
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
+	file_struct->top =
+	   yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
 
-		return -1;
-	}
+	/* Now we have a tree with all the non-zero branches NULL but
+	 * the height is the same as it was.
+	 * Let's see if we can trim internal tnodes to shorten the tree.
+	 * We can do this if only the 0th element in the tnode is in use
+	 * (ie all the non-zero are NULL)
+	 */
 
-	/* Find an empty block. */
+	while (file_struct->top_level && !done) {
+		tn = file_struct->top;
 
-	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-		dev->allocationBlockFinder++;
-		if (dev->allocationBlockFinder < dev->internalStartBlock
-		    || dev->allocationBlockFinder > dev->internalEndBlock) {
-			dev->allocationBlockFinder = dev->internalStartBlock;
+		has_data = 0;
+		for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i])
+				has_data++;
 		}
 
-		bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
-
-		if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
-			bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
-			dev->sequenceNumber++;
-			bi->sequenceNumber = dev->sequenceNumber;
-			dev->nErasedBlocks--;
-			T(YAFFS_TRACE_ALLOCATE,
-			  (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
-			   dev->allocationBlockFinder, dev->sequenceNumber,
-			   dev->nErasedBlocks));
-			return dev->allocationBlockFinder;
+		if (!has_data) {
+			file_struct->top = tn->internal[0];
+			file_struct->top_level--;
+			yaffs_free_tnode(dev, tn);
+		} else {
+			done = 1;
 		}
 	}
 
-	T(YAFFS_TRACE_ALWAYS,
-	  (TSTR
-	   ("yaffs tragedy: no more eraased blocks, but there should have been %d"
-	    TENDSTR), dev->nErasedBlocks));
-
-	return -1;
+	return YAFFS_OK;
 }
 
+/*-------------------- End of File Structure functions.-------------------*/
 
-// Check if there's space to allocate...
-// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
-static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
+/* alloc_empty_obj gets us a clean Object.*/
+static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
 {
-	int reservedChunks;
-	int reservedBlocks = dev->nReservedBlocks;
-	int checkpointBlocks;
+	struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
 
-	checkpointBlocks =  dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
-	if(checkpointBlocks < 0)
-		checkpointBlocks = 0;
+	if (!obj)
+		return obj;
 
-	reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
+	dev->n_obj++;
 
-	return (dev->nFreeChunks > reservedChunks);
-}
+	/* Now sweeten it up... */
 
-static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
-{
-	int retVal;
-	yaffs_BlockInfo *bi;
+	memset(obj, 0, sizeof(struct yaffs_obj));
+	obj->being_created = 1;
 
-	if (dev->allocationBlock < 0) {
-		/* Get next block to allocate off */
-		dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
-		dev->allocationPage = 0;
-	}
+	obj->my_dev = dev;
+	obj->hdr_chunk = 0;
+	obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
+	INIT_LIST_HEAD(&(obj->hard_links));
+	INIT_LIST_HEAD(&(obj->hash_link));
+	INIT_LIST_HEAD(&obj->siblings);
 
-	if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
-		/* Not enough space to allocate unless we're allowed to use the reserve. */
-		return -1;
+	/* Now make the directory sane */
+	if (dev->root_dir) {
+		obj->parent = dev->root_dir;
+		list_add(&(obj->siblings),
+			 &dev->root_dir->variant.dir_variant.children);
 	}
 
-	if (dev->nErasedBlocks < dev->nReservedBlocks
-	    && dev->allocationPage == 0) {
-		T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
-	}
-
-	/* Next page please.... */
-	if (dev->allocationBlock >= 0) {
-		bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
-
-		retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
-		    dev->allocationPage;
-		bi->pagesInUse++;
-		yaffs_SetChunkBit(dev, dev->allocationBlock,
-				  dev->allocationPage);
-
-		dev->allocationPage++;
-
-		dev->nFreeChunks--;
-
-		/* If the block is full set the state to full */
-		if (dev->allocationPage >= dev->nChunksPerBlock) {
-			bi->blockState = YAFFS_BLOCK_STATE_FULL;
-			dev->allocationBlock = -1;
-		}
-
-		if(blockUsedPtr)
-			*blockUsedPtr = bi;
+	/* Add it to the lost and found directory.
+	 * NB Can't put root or lost-n-found in lost-n-found so
+	 * check if lost-n-found exists first
+	 */
+	if (dev->lost_n_found)
+		yaffs_add_obj_to_dir(dev->lost_n_found, obj);
 
-		return retVal;
-	}
+	obj->being_created = 0;
 
-	T(YAFFS_TRACE_ERROR,
-	  (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
 
-	return -1;
+	return obj;
 }
 
-static int yaffs_GetErasedChunks(yaffs_Device * dev)
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
 {
-	int n;
+	int i;
+	int l = 999;
+	int lowest = 999999;
 
-	n = dev->nErasedBlocks * dev->nChunksPerBlock;
+	/* Search for the shortest list or one that
+	 * isn't too long.
+	 */
 
-	if (dev->allocationBlock > 0) {
-		n += (dev->nChunksPerBlock - dev->allocationPage);
+	for (i = 0; i < 10 && lowest > 4; i++) {
+		dev->bucket_finder++;
+		dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
+			lowest = dev->obj_bucket[dev->bucket_finder].count;
+			l = dev->bucket_finder;
+		}
 	}
 
-	return n;
-
+	return l;
 }
 
-static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
 {
-	int oldChunk;
-	int newChunk;
-	int chunkInBlock;
-	int markNAND;
-	int retVal = YAFFS_OK;
-	int cleanups = 0;
-	int i;
-	int isCheckpointBlock;
-	int matchingChunk;
-
-	int chunksBefore = yaffs_GetErasedChunks(dev);
-	int chunksAfter;
-
-	yaffs_ExtendedTags tags;
-
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
-
-	yaffs_Object *object;
-
-	isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
-
-	bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
-
-	T(YAFFS_TRACE_TRACING,
-	  (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
-	   bi->pagesInUse, bi->hasShrinkHeader));
-
-	/*yaffs_VerifyFreeChunks(dev); */
-
-	bi->hasShrinkHeader = 0;	/* clear the flag so that the block can erase */
+	int bucket = yaffs_find_nice_bucket(dev);
+	int found = 0;
+	struct list_head *i;
+	u32 n = (u32) bucket;
 
-	/* Take off the number of soft deleted entries because
-	 * they're going to get really deleted during GC.
+	/* Now find an object value that has not already been taken
+	 * by scanning the list.
 	 */
-	dev->nFreeChunks -= bi->softDeletions;
-
-	dev->isDoingGC = 1;
-
-	if (isCheckpointBlock ||
-	    !yaffs_StillSomeChunkBits(dev, block)) {
-		T(YAFFS_TRACE_TRACING,
-		  (TSTR
-		   ("Collecting block %d that has no chunks in use" TENDSTR),
-		   block));
-		yaffs_BlockBecameDirty(dev, block);
-	} else {
-
-		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-		yaffs_VerifyBlock(dev,bi,block);
-
-		for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
-		     chunkInBlock < dev->nChunksPerBlock
-		     && yaffs_StillSomeChunkBits(dev, block);
-		     chunkInBlock++, oldChunk++) {
-			if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
-
-				/* This page is in use and might need to be copied off */
 
-				markNAND = 1;
-
-				yaffs_InitialiseTags(&tags);
-
-				yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
-								buffer, &tags);
-
-				object =
-				    yaffs_FindObjectByNumber(dev,
-							     tags.objectId);
-
-				T(YAFFS_TRACE_GC_DETAIL,
-				  (TSTR
-				   ("Collecting page %d, %d %d %d " TENDSTR),
-				   chunkInBlock, tags.objectId, tags.chunkId,
-				   tags.byteCount));
-
-				if(object && !yaffs_SkipVerification(dev)){
-					if(tags.chunkId == 0)
-						matchingChunk = object->chunkId;
-					else if(object->softDeleted)
-						matchingChunk = oldChunk; /* Defeat the test */
-					else
-						matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
-
-					if(oldChunk != matchingChunk)
-						T(YAFFS_TRACE_ERROR,
-						  (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
-						  oldChunk,matchingChunk,tags.objectId, tags.chunkId));
-
-				}
-
-				if (!object) {
-					T(YAFFS_TRACE_ERROR,
-					  (TSTR
-					   ("page %d in gc has no object: %d %d %d "
-					    TENDSTR), oldChunk,
-					    tags.objectId, tags.chunkId, tags.byteCount));
-				}
-
-				if (object && object->deleted
-				    && tags.chunkId != 0) {
-					/* Data chunk in a deleted file, throw it away
-					 * It's a soft deleted data chunk,
-					 * No need to copy this, just forget about it and
-					 * fix up the object.
-					 */
-
-					object->nDataChunks--;
-
-					if (object->nDataChunks <= 0) {
-						/* remeber to clean up the object */
-						dev->gcCleanupList[cleanups] =
-						    tags.objectId;
-						cleanups++;
-					}
-					markNAND = 0;
-				} else if (0
-					   /* Todo object && object->deleted && object->nDataChunks == 0 */
-					   ) {
-					/* Deleted object header with no data chunks.
-					 * Can be discarded and the file deleted.
-					 */
-					object->chunkId = 0;
-					yaffs_FreeTnode(object->myDev,
-							object->variant.
-							fileVariant.top);
-					object->variant.fileVariant.top = NULL;
-					yaffs_DoGenericObjectDeletion(object);
-
-				} else if (object) {
-					/* It's either a data chunk in a live file or
-					 * an ObjectHeader, so we're interested in it.
-					 * NB Need to keep the ObjectHeaders of deleted files
-					 * until the whole file has been deleted off
-					 */
-					tags.serialNumber++;
-
-					dev->nGCCopies++;
-
-					if (tags.chunkId == 0) {
-						/* It is an object Id,
-						 * We need to nuke the shrinkheader flags first
-						 * We no longer want the shrinkHeader flag since its work is done
-						 * and if it is left in place it will mess up scanning.
-						 * Also, clear out any shadowing stuff
-						 */
-
-						yaffs_ObjectHeader *oh;
-						oh = (yaffs_ObjectHeader *)buffer;
-						oh->isShrink = 0;
-						oh->shadowsObject = -1;
-						tags.extraShadows = 0;
-						tags.extraIsShrinkHeader = 0;
-
-						yaffs_VerifyObjectHeader(object,oh,&tags,1);
-					}
-
-					newChunk =
-					    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
-
-					if (newChunk < 0) {
-						retVal = YAFFS_FAIL;
-					} else {
-
-						/* Ok, now fix up the Tnodes etc. */
-
-						if (tags.chunkId == 0) {
-							/* It's a header */
-							object->chunkId =  newChunk;
-							object->serial =   tags.serialNumber;
-						} else {
-							/* It's a data chunk */
-							yaffs_PutChunkIntoFile
-							    (object,
-							     tags.chunkId,
-							     newChunk, 0);
-						}
-					}
+	while (!found) {
+		found = 1;
+		n += YAFFS_NOBJECT_BUCKETS;
+		if (1 || dev->obj_bucket[bucket].count > 0) {
+			list_for_each(i, &dev->obj_bucket[bucket].list) {
+				/* If there is already one in the list */
+				if (i && list_entry(i, struct yaffs_obj,
+						    hash_link)->obj_id == n) {
+					found = 0;
 				}
-
-				yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
-
 			}
 		}
+	}
+	return n;
+}
 
-		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+static void yaffs_hash_obj(struct yaffs_obj *in)
+{
+	int bucket = yaffs_hash_fn(in->obj_id);
+	struct yaffs_dev *dev = in->my_dev;
 
+	list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+	dev->obj_bucket[bucket].count++;
+}
 
-		/* Do any required cleanups */
-		for (i = 0; i < cleanups; i++) {
-			/* Time to delete the file too */
-			object =
-			    yaffs_FindObjectByNumber(dev,
-						     dev->gcCleanupList[i]);
-			if (object) {
-				yaffs_FreeTnode(dev,
-						object->variant.fileVariant.
-						top);
-				object->variant.fileVariant.top = NULL;
-				T(YAFFS_TRACE_GC,
-				  (TSTR
-				   ("yaffs: About to finally delete object %d"
-				    TENDSTR), object->objectId));
-				yaffs_DoGenericObjectDeletion(object);
-				object->myDev->nDeletedFiles--;
-			}
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
+{
+	int bucket = yaffs_hash_fn(number);
+	struct list_head *i;
+	struct yaffs_obj *in;
 
+	list_for_each(i, &dev->obj_bucket[bucket].list) {
+		/* Look if it is in the list */
+		in = list_entry(i, struct yaffs_obj, hash_link);
+		if (in->obj_id == number) {
+			/* Don't show if it is defered free */
+			if (in->defered_free)
+				return NULL;
+			return in;
 		}
-
-	}
-
-	yaffs_VerifyCollectedBlock(dev,bi,block);
-
-	if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
-		T(YAFFS_TRACE_GC,
-		  (TSTR
-		   ("gc did not increase free chunks before %d after %d"
-		    TENDSTR), chunksBefore, chunksAfter));
 	}
 
-	dev->isDoingGC = 0;
-
-	return retVal;
+	return NULL;
 }
 
-/* New garbage collector
- * If we're very low on erased blocks then we do aggressive garbage collection
- * otherwise we do "leasurely" garbage collection.
- * Aggressive gc looks further (whole array) and will accept less dirty blocks.
- * Passive gc only inspects smaller areas and will only accept more dirty blocks.
- *
- * The idea is to help clear out space in a more spread-out manner.
- * Dunno if it really does anything useful.
- */
-static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
+struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+				enum yaffs_obj_type type)
 {
-	int block;
-	int aggressive;
-	int gcOk = YAFFS_OK;
-	int maxTries = 0;
+	struct yaffs_obj *the_obj = NULL;
+	struct yaffs_tnode *tn = NULL;
 
-	int checkpointBlockAdjust;
+	if (number < 0)
+		number = yaffs_new_obj_id(dev);
 
-	if (dev->isDoingGC) {
-		/* Bail out so we don't get recursive gc */
-		return YAFFS_OK;
+	if (type == YAFFS_OBJECT_TYPE_FILE) {
+		tn = yaffs_get_tnode(dev);
+		if (!tn)
+			return NULL;
 	}
 
-	/* This loop should pass the first time.
-	 * We'll only see looping here if the erase of the collected block fails.
-	 */
-
-	do {
-		maxTries++;
+	the_obj = yaffs_alloc_empty_obj(dev);
+	if (!the_obj) {
+		if (tn)
+			yaffs_free_tnode(dev, tn);
+		return NULL;
+	}
 
-		checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
-		if(checkpointBlockAdjust < 0)
-			checkpointBlockAdjust = 0;
+	the_obj->fake = 0;
+	the_obj->rename_allowed = 1;
+	the_obj->unlink_allowed = 1;
+	the_obj->obj_id = number;
+	yaffs_hash_obj(the_obj);
+	the_obj->variant_type = type;
+	yaffs_load_current_time(the_obj, 1, 1);
 
-		if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
-			/* We need a block soon...*/
-			aggressive = 1;
-		} else {
-			/* We're in no hurry */
-			aggressive = 0;
-		}
-
-		block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		the_obj->variant.file_variant.file_size = 0;
+		the_obj->variant.file_variant.scanned_size = 0;
+		the_obj->variant.file_variant.shrink_size =
+						yaffs_max_file_size(dev);
+		the_obj->variant.file_variant.top_level = 0;
+		the_obj->variant.file_variant.top = tn;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
+		INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		/* No action required */
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* todo this should not happen */
+		break;
+	}
+	return the_obj;
+}
 
-		if (block > 0) {
-			dev->garbageCollections++;
-			if (!aggressive) {
-				dev->passiveGarbageCollections++;
-			}
+static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
+					       int number, u32 mode)
+{
 
-			T(YAFFS_TRACE_GC,
-			  (TSTR
-			   ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
-			   dev->nErasedBlocks, aggressive));
+	struct yaffs_obj *obj =
+	    yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
 
-			gcOk = yaffs_GarbageCollectBlock(dev, block);
-		}
+	if (!obj)
+		return NULL;
 
-		if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
-			T(YAFFS_TRACE_GC,
-			  (TSTR
-			   ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
-			    TENDSTR), dev->nErasedBlocks, maxTries, block));
-		}
-	} while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
-		 && (maxTries < 2));
+	obj->fake = 1;	/* it is fake so it might not use NAND */
+	obj->rename_allowed = 0;
+	obj->unlink_allowed = 0;
+	obj->deleted = 0;
+	obj->unlinked = 0;
+	obj->yst_mode = mode;
+	obj->my_dev = dev;
+	obj->hdr_chunk = 0;	/* Not a valid chunk. */
+	return obj;
 
-	return aggressive ? gcOk : YAFFS_OK;
 }
 
-/*-------------------------  TAGS --------------------------------*/
 
-static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
-			   int chunkInObject)
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
 {
-	return (tags->chunkId == chunkInObject &&
-		tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
-
-}
+	int i;
 
+	dev->n_obj = 0;
+	dev->n_tnodes = 0;
+	yaffs_init_raw_tnodes_and_objs(dev);
 
-/*-------------------- Data file manipulation -----------------*/
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		INIT_LIST_HEAD(&dev->obj_bucket[i].list);
+		dev->obj_bucket[i].count = 0;
+	}
+}
 
-static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
-				 yaffs_ExtendedTags * tags)
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+						 int number,
+						 enum yaffs_obj_type type)
 {
-	/*Get the Tnode, then get the level 0 offset chunk offset */
-	yaffs_Tnode *tn;
-	int theChunk = -1;
-	yaffs_ExtendedTags localTags;
-	int retVal = -1;
+	struct yaffs_obj *the_obj = NULL;
 
-	yaffs_Device *dev = in->myDev;
+	if (number > 0)
+		the_obj = yaffs_find_by_number(dev, number);
 
-	if (!tags) {
-		/* Passed a NULL, so use our own tags space */
-		tags = &localTags;
-	}
-
-	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+	if (!the_obj)
+		the_obj = yaffs_new_obj(dev, number, type);
 
-	if (tn) {
-		theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+	return the_obj;
 
-		retVal =
-		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-					   chunkInInode);
-	}
-	return retVal;
 }
 
-static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
-					  yaffs_ExtendedTags * tags)
+YCHAR *yaffs_clone_str(const YCHAR *str)
 {
-	/* Get the Tnode, then get the level 0 offset chunk offset */
-	yaffs_Tnode *tn;
-	int theChunk = -1;
-	yaffs_ExtendedTags localTags;
+	YCHAR *new_str = NULL;
+	int len;
 
-	yaffs_Device *dev = in->myDev;
-	int retVal = -1;
+	if (!str)
+		str = _Y("");
 
-	if (!tags) {
-		/* Passed a NULL, so use our own tags space */
-		tags = &localTags;
+	len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
+	new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
+	if (new_str) {
+		yaffs_strncpy(new_str, str, len);
+		new_str[len] = 0;
 	}
+	return new_str;
 
-	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
-
-	if (tn) {
-
-		theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+}
+/*
+ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_update_dirty_dirs must be
+ * called periodically.
+ */
 
-		retVal =
-		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-					   chunkInInode);
+static void yaffs_update_parent(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
 
-		/* Delete the entry in the filestructure (if found) */
-		if (retVal != -1) {
-			yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
+	if (!obj)
+		return;
+	dev = obj->my_dev;
+	obj->dirty = 1;
+	yaffs_load_current_time(obj, 0, 1);
+	if (dev->param.defered_dir_update) {
+		struct list_head *link = &obj->variant.dir_variant.dirty;
+
+		if (list_empty(link)) {
+			list_add(link, &dev->dirty_dirs);
+			yaffs_trace(YAFFS_TRACE_BACKGROUND,
+			  "Added object %d to dirty directories",
+			   obj->obj_id);
 		}
-	} else {
-		/*T(("No level 0 found for %d\n", chunkInInode)); */
-	}
 
-	if (retVal == -1) {
-		/* T(("Could not find %d to delete\n",chunkInInode)); */
+	} else {
+		yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
 	}
-	return retVal;
 }
 
-#ifdef YAFFS_PARANOID
-
-static int yaffs_CheckFileSanity(yaffs_Object * in)
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
 {
-	int chunk;
-	int nChunks;
-	int fSize;
-	int failed = 0;
-	int objId;
-	yaffs_Tnode *tn;
-	yaffs_Tags localTags;
-	yaffs_Tags *tags = &localTags;
-	int theChunk;
-	int chunkDeleted;
-
-	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
-		/* T(("Object not a file\n")); */
-		return YAFFS_FAIL;
-	}
-
-	objId = in->objectId;
-	fSize = in->variant.fileVariant.fileSize;
-	nChunks =
-	    (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
+	struct list_head *link;
+	struct yaffs_obj *obj;
+	struct yaffs_dir_var *d_s;
+	union yaffs_obj_var *o_v;
 
-	for (chunk = 1; chunk <= nChunks; chunk++) {
-		tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
-					   chunk);
+	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
 
-		if (tn) {
+	while (!list_empty(&dev->dirty_dirs)) {
+		link = dev->dirty_dirs.next;
+		list_del_init(link);
 
-			theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
+		d_s = list_entry(link, struct yaffs_dir_var, dirty);
+		o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
+		obj = list_entry(o_v, struct yaffs_obj, variant);
 
-			if (yaffs_CheckChunkBits
-			    (dev, theChunk / dev->nChunksPerBlock,
-			     theChunk % dev->nChunksPerBlock)) {
+		yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
+			obj->obj_id);
 
-				yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
-							    tags,
-							    &chunkDeleted);
-				if (yaffs_TagsMatch
-				    (tags, in->objectId, chunk, chunkDeleted)) {
-					/* found it; */
-
-				}
-			} else {
-
-				failed = 1;
-			}
-
-		} else {
-			/* T(("No level 0 found for %d\n", chunk)); */
-		}
+		if (obj->dirty)
+			yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
 	}
-
-	return failed ? YAFFS_FAIL : YAFFS_OK;
 }
 
-#endif
+/*
+ * Mknod (create) a new object.
+ * equiv_obj only has meaning for a hard link;
+ * alias_str only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
 
-static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
-				  int chunkInNAND, int inScan)
+static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
+					  struct yaffs_obj *parent,
+					  const YCHAR *name,
+					  u32 mode,
+					  u32 uid,
+					  u32 gid,
+					  struct yaffs_obj *equiv_obj,
+					  const YCHAR *alias_str, u32 rdev)
 {
-	/* NB inScan is zero unless scanning.
-	 * For forward scanning, inScan is > 0;
-	 * for backward scanning inScan is < 0
-	 */
-
-	yaffs_Tnode *tn;
-	yaffs_Device *dev = in->myDev;
-	int existingChunk;
-	yaffs_ExtendedTags existingTags;
-	yaffs_ExtendedTags newTags;
-	unsigned existingSerial, newSerial;
-
-	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
-		/* Just ignore an attempt at putting a chunk into a non-file during scanning
-		 * If it is not during Scanning then something went wrong!
-		 */
-		if (!inScan) {
-			T(YAFFS_TRACE_ERROR,
-			  (TSTR
-			   ("yaffs tragedy:attempt to put data chunk into a non-file"
-			    TENDSTR)));
-			YBUG();
-		}
+	struct yaffs_obj *in;
+	YCHAR *str = NULL;
+	struct yaffs_dev *dev = parent->my_dev;
 
-		yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-		return YAFFS_OK;
-	}
+	/* Check if the entry exists.
+	 * If it does then fail the call since we don't want a dup. */
+	if (yaffs_find_by_name(parent, name))
+		return NULL;
 
-	tn = yaffs_AddOrFindLevel0Tnode(dev,
-					&in->variant.fileVariant,
-					chunkInInode,
-					NULL);
-	if (!tn) {
-		return YAFFS_FAIL;
+	if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		str = yaffs_clone_str(alias_str);
+		if (!str)
+			return NULL;
 	}
 
-	existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+	in = yaffs_new_obj(dev, -1, type);
 
-	if (inScan != 0) {
-		/* If we're scanning then we need to test for duplicates
-		 * NB This does not need to be efficient since it should only ever
-		 * happen when the power fails during a write, then only one
-		 * chunk should ever be affected.
-		 *
-		 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
-		 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
-		 */
-
-		if (existingChunk != 0) {
-			/* NB Right now existing chunk will not be real chunkId if the device >= 32MB
-			 *    thus we have to do a FindChunkInFile to get the real chunk id.
-			 *
-			 * We have a duplicate now we need to decide which one to use:
-			 *
-			 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
-			 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
-			 * YAFFS1: Get both sets of tags and compare serial numbers.
-			 */
-
-			if (inScan > 0) {
-				/* Only do this for forward scanning */
-				yaffs_ReadChunkWithTagsFromNAND(dev,
-								chunkInNAND,
-								NULL, &newTags);
+	if (!in) {
+		kfree(str);
+		return NULL;
+	}
 
-				/* Do a proper find */
-				existingChunk =
-				    yaffs_FindChunkInFile(in, chunkInInode,
-							  &existingTags);
-			}
+	in->hdr_chunk = 0;
+	in->valid = 1;
+	in->variant_type = type;
 
-			if (existingChunk <= 0) {
-				/*Hoosterman - how did this happen? */
+	in->yst_mode = mode;
 
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("yaffs tragedy: existing chunk < 0 in scan"
-				    TENDSTR)));
+	yaffs_attribs_init(in, gid, uid, rdev);
 
-			}
+	in->n_data_chunks = 0;
 
-			/* NB The deleted flags should be false, otherwise the chunks will
-			 * not be loaded during a scan
-			 */
+	yaffs_set_obj_name(in, name);
+	in->dirty = 1;
 
-			newSerial = newTags.serialNumber;
-			existingSerial = existingTags.serialNumber;
+	yaffs_add_obj_to_dir(parent, in);
 
-			if ((inScan > 0) &&
-			    (in->myDev->isYaffs2 ||
-			     existingChunk <= 0 ||
-			     ((existingSerial + 1) & 3) == newSerial)) {
-				/* Forward scanning.
-				 * Use new
-				 * Delete the old one and drop through to update the tnode
-				 */
-				yaffs_DeleteChunk(dev, existingChunk, 1,
-						  __LINE__);
-			} else {
-				/* Backward scanning or we want to use the existing one
-				 * Use existing.
-				 * Delete the new one and return early so that the tnode isn't changed
-				 */
-				yaffs_DeleteChunk(dev, chunkInNAND, 1,
-						  __LINE__);
-				return YAFFS_OK;
-			}
-		}
+	in->my_dev = parent->my_dev;
 
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		in->variant.symlink_variant.alias = str;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		in->variant.hardlink_variant.equiv_obj = equiv_obj;
+		in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
+		list_add(&in->hard_links, &equiv_obj->hard_links);
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* do nothing */
+		break;
 	}
 
-	if (existingChunk == 0) {
-		in->nDataChunks++;
+	if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+		/* Could not create the object header, fail */
+		yaffs_del_obj(in);
+		in = NULL;
 	}
 
-	yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
+	if (in)
+		yaffs_update_parent(parent);
 
-	return YAFFS_OK;
+	return in;
 }
 
-static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
-					 __u8 * buffer)
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+				    const YCHAR *name, u32 mode, u32 uid,
+				    u32 gid)
 {
-	int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+				uid, gid, NULL, NULL, 0);
+}
 
-	if (chunkInNAND >= 0) {
-		return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
-						       buffer,NULL);
-	} else {
-		T(YAFFS_TRACE_NANDACCESS,
-		  (TSTR("Chunk %d not found zero instead" TENDSTR),
-		   chunkInNAND));
-		/* get sane (zero) data if you read a hole */
-		memset(buffer, 0, in->myDev->nDataBytesPerChunk);
-		return 0;
-	}
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
+				   u32 mode, u32 uid, u32 gid)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+				mode, uid, gid, NULL, NULL, 0);
+}
 
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, u32 rdev)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+				uid, gid, NULL, NULL, rdev);
 }
 
-void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, const YCHAR *alias)
 {
-	int block;
-	int page;
-	yaffs_ExtendedTags tags;
-	yaffs_BlockInfo *bi;
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+				uid, gid, NULL, alias, 0);
+}
 
-	if (chunkId <= 0)
-		return;
+/* yaffs_link_obj returns the object id of the equivalent object.*/
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+				 struct yaffs_obj *equiv_obj)
+{
+	/* Get the real object in case we were fed a hard link obj */
+	equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
 
+	if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
+			parent, name, 0, 0, 0,
+			equiv_obj, NULL, 0))
+		return equiv_obj;
 
-	dev->nDeletions++;
-	block = chunkId / dev->nChunksPerBlock;
-	page = chunkId % dev->nChunksPerBlock;
+	return NULL;
 
+}
 
-	if(!yaffs_CheckChunkBit(dev,block,page))
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Deleting invalid chunk %d"TENDSTR),
-			 chunkId));
 
-	bi = yaffs_GetBlockInfo(dev, block);
 
-	T(YAFFS_TRACE_DELETION,
-	  (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
+/*---------------------- Block Management and Page Allocation -------------*/
 
-	if (markNAND &&
-	    bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
+{
+	if (dev->block_info_alt && dev->block_info)
+		vfree(dev->block_info);
+	else
+		kfree(dev->block_info);
 
-		yaffs_InitialiseTags(&tags);
+	dev->block_info_alt = 0;
 
-		tags.chunkDeleted = 1;
+	dev->block_info = NULL;
 
-		yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
-		yaffs_HandleUpdateChunk(dev, chunkId, &tags);
-	} else {
-		dev->nUnmarkedDeletions++;
-	}
+	if (dev->chunk_bits_alt && dev->chunk_bits)
+		vfree(dev->chunk_bits);
+	else
+		kfree(dev->chunk_bits);
+	dev->chunk_bits_alt = 0;
+	dev->chunk_bits = NULL;
+}
 
-	/* Pull out of the management area.
-	 * If the whole block became dirty, this will kick off an erasure.
-	 */
-	if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
-	    bi->blockState == YAFFS_BLOCK_STATE_FULL ||
-	    bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-	    bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
-		dev->nFreeChunks++;
+static int yaffs_init_blocks(struct yaffs_dev *dev)
+{
+	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
 
-		yaffs_ClearChunkBit(dev, block, page);
+	dev->block_info = NULL;
+	dev->chunk_bits = NULL;
+	dev->alloc_block = -1;	/* force it to get a new one */
 
-		bi->pagesInUse--;
+	/* If the first allocation strategy fails, thry the alternate one */
+	dev->block_info =
+		kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
+	if (!dev->block_info) {
+		dev->block_info =
+		    vmalloc(n_blocks * sizeof(struct yaffs_block_info));
+		dev->block_info_alt = 1;
+	} else {
+		dev->block_info_alt = 0;
+	}
 
-		if (bi->pagesInUse == 0 &&
-		    !bi->hasShrinkHeader &&
-		    bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
-		    bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-			yaffs_BlockBecameDirty(dev, block);
-		}
+	if (!dev->block_info)
+		goto alloc_error;
 
+	/* Set up dynamic blockinfo stuff. Round up bytes. */
+	dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
+	dev->chunk_bits =
+		kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
+	if (!dev->chunk_bits) {
+		dev->chunk_bits =
+		    vmalloc(dev->chunk_bit_stride * n_blocks);
+		dev->chunk_bits_alt = 1;
 	} else {
-		/* T(("Bad news deleting chunk %d\n",chunkId)); */
+		dev->chunk_bits_alt = 0;
 	}
+	if (!dev->chunk_bits)
+		goto alloc_error;
 
-}
-
-static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
-					const __u8 * buffer, int nBytes,
-					int useReserve)
-{
-	/* Find old chunk Need to do this to get serial number
-	 * Write new one and patch into tree.
-	 * Invalidate old tags.
-	 */
 
-	int prevChunkId;
-	yaffs_ExtendedTags prevTags;
+	memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
+	memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
+	return YAFFS_OK;
 
-	int newChunkId;
-	yaffs_ExtendedTags newTags;
+alloc_error:
+	yaffs_deinit_blocks(dev);
+	return YAFFS_FAIL;
+}
 
-	yaffs_Device *dev = in->myDev;
 
-	yaffs_CheckGarbageCollection(dev);
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+	int erased_ok = 0;
+	int i;
 
-	/* Get the previous chunk at this location in the file if it exists */
-	prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+	/* If the block is still healthy erase it and mark as clean.
+	 * If the block has had a data failure, then retire it.
+	 */
 
-	/* Set up new tags */
-	yaffs_InitialiseTags(&newTags);
+	yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+		"yaffs_block_became_dirty block %d state %d %s",
+		block_no, bi->block_state,
+		(bi->needs_retiring) ? "needs retiring" : "");
 
-	newTags.chunkId = chunkInInode;
-	newTags.objectId = in->objectId;
-	newTags.serialNumber =
-	    (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
-	newTags.byteCount = nBytes;
+	yaffs2_clear_oldest_dirty_seq(dev, bi);
 
-	newChunkId =
-	    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-					      useReserve);
+	bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
 
-	if (newChunkId >= 0) {
-		yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
+	/* If this is the block being garbage collected then stop gc'ing */
+	if (block_no == dev->gc_block)
+		dev->gc_block = 0;
 
-		if (prevChunkId >= 0) {
-			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
+	/* If this block is currently the best candidate for gc
+	 * then drop as a candidate */
+	if (block_no == dev->gc_dirtiest) {
+		dev->gc_dirtiest = 0;
+		dev->gc_pages_in_use = 0;
+	}
 
+	if (!bi->needs_retiring) {
+		yaffs2_checkpt_invalidate(dev);
+		erased_ok = yaffs_erase_block(dev, block_no);
+		if (!erased_ok) {
+			dev->n_erase_failures++;
+			yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			  "**>> Erasure failed %d", block_no);
 		}
-
-		yaffs_CheckFileSanity(in);
 	}
-	return newChunkId;
 
-}
-
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
-			     int isShrink, int shadows)
-{
-
-	yaffs_BlockInfo *bi;
-
-	yaffs_Device *dev = in->myDev;
-
-	int prevChunkId;
-	int retVal = 0;
-
-	int newChunkId;
-	yaffs_ExtendedTags newTags;
-	yaffs_ExtendedTags oldTags;
-
-	__u8 *buffer = NULL;
-	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
-
-	yaffs_ObjectHeader *oh = NULL;
-
-	yaffs_strcpy(oldName,"silly old name");
+	/* Verify erasure if needed */
+	if (erased_ok &&
+	    ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
+	     !yaffs_skip_verification(dev))) {
+		for (i = 0; i < dev->param.chunks_per_block; i++) {
+			if (!yaffs_check_chunk_erased(dev,
+				block_no * dev->param.chunks_per_block + i)) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					">>Block %d erasure supposedly OK, but chunk %d not erased",
+					block_no, i);
+			}
+		}
+	}
 
-	if (!in->fake || force) {
+	if (!erased_ok) {
+		/* We lost a block of free space */
+		dev->n_free_chunks -= dev->param.chunks_per_block;
+		yaffs_retire_block(dev, block_no);
+		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			"**>> Block %d retired", block_no);
+		return;
+	}
 
-		yaffs_CheckGarbageCollection(dev);
-		yaffs_CheckObjectDetailsLoaded(in);
+	/* Clean it up... */
+	bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+	bi->seq_number = 0;
+	dev->n_erased_blocks++;
+	bi->pages_in_use = 0;
+	bi->soft_del_pages = 0;
+	bi->has_shrink_hdr = 0;
+	bi->skip_erased_check = 1;	/* Clean, so no need to check */
+	bi->gc_prioritise = 0;
+	bi->has_summary = 0;
+
+	yaffs_clear_chunk_bits(dev, block_no);
+
+	yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
+}
+
+static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
+					struct yaffs_block_info *bi,
+					int old_chunk, u8 *buffer)
+{
+	int new_chunk;
+	int mark_flash = 1;
+	struct yaffs_ext_tags tags;
+	struct yaffs_obj *object;
+	int matching_chunk;
+	int ret_val = YAFFS_OK;
+
+	memset(&tags, 0, sizeof(tags));
+	yaffs_rd_chunk_tags_nand(dev, old_chunk,
+				 buffer, &tags);
+	object = yaffs_find_by_number(dev, tags.obj_id);
+
+	yaffs_trace(YAFFS_TRACE_GC_DETAIL,
+		"Collecting chunk in block %d, %d %d %d ",
+		dev->gc_chunk, tags.obj_id,
+		tags.chunk_id, tags.n_bytes);
+
+	if (object && !yaffs_skip_verification(dev)) {
+		if (tags.chunk_id == 0)
+			matching_chunk =
+			    object->hdr_chunk;
+		else if (object->soft_del)
+			/* Defeat the test */
+			matching_chunk = old_chunk;
+		else
+			matching_chunk =
+			    yaffs_find_chunk_in_file
+			    (object, tags.chunk_id,
+			     NULL);
+
+		if (old_chunk != matching_chunk)
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"gc: page in gc mismatch: %d %d %d %d",
+				old_chunk,
+				matching_chunk,
+				tags.obj_id,
+				tags.chunk_id);
+	}
+
+	if (!object) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"page %d in gc has no object: %d %d %d ",
+			old_chunk,
+			tags.obj_id, tags.chunk_id,
+			tags.n_bytes);
+	}
+
+	if (object &&
+	    object->deleted &&
+	    object->soft_del && tags.chunk_id != 0) {
+		/* Data chunk in a soft deleted file,
+		 * throw it away.
+		 * It's a soft deleted data chunk,
+		 * No need to copy this, just forget
+		 * about it and fix up the object.
+		 */
 
-		buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
-		oh = (yaffs_ObjectHeader *) buffer;
+		/* Free chunks already includes
+		 * softdeleted chunks, how ever this
+		 * chunk is going to soon be really
+		 * deleted which will increment free
+		 * chunks. We have to decrement free
+		 * chunks so this works out properly.
+		 */
+		dev->n_free_chunks--;
+		bi->soft_del_pages--;
+
+		object->n_data_chunks--;
+		if (object->n_data_chunks <= 0) {
+			/* remeber to clean up obj */
+			dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
+			dev->n_clean_ups++;
+		}
+		mark_flash = 0;
+	} else if (object) {
+		/* It's either a data chunk in a live
+		 * file or an ObjectHeader, so we're
+		 * interested in it.
+		 * NB Need to keep the ObjectHeaders of
+		 * deleted files until the whole file
+		 * has been deleted off
+		 */
+		tags.serial_number++;
+		dev->n_gc_copies++;
+
+		if (tags.chunk_id == 0) {
+			/* It is an object Id,
+			 * We need to nuke the
+			 * shrinkheader flags since its
+			 * work is done.
+			 * Also need to clean up
+			 * shadowing.
+			 */
+			struct yaffs_obj_hdr *oh;
+			oh = (struct yaffs_obj_hdr *) buffer;
+
+			oh->is_shrink = 0;
+			tags.extra_is_shrink = 0;
+			oh->shadows_obj = 0;
+			oh->inband_shadowed_obj_id = 0;
+			tags.extra_shadows = 0;
+
+			/* Update file size */
+			if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+				yaffs_oh_size_load(oh,
+				    object->variant.file_variant.file_size);
+				tags.extra_file_size =
+				    object->variant.file_variant.file_size;
+			}
 
-		prevChunkId = in->chunkId;
+			yaffs_verify_oh(object, oh, &tags, 1);
+			new_chunk =
+			    yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
+		} else {
+			new_chunk =
+			    yaffs_write_new_chunk(dev, buffer, &tags, 1);
+		}
 
-		if (prevChunkId >= 0) {
-			yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
-							buffer, &oldTags);
+		if (new_chunk < 0) {
+			ret_val = YAFFS_FAIL;
+		} else {
 
-			yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
+			/* Now fix up the Tnodes etc. */
 
-			memcpy(oldName, oh->name, sizeof(oh->name));
+			if (tags.chunk_id == 0) {
+				/* It's a header */
+				object->hdr_chunk = new_chunk;
+				object->serial = tags.serial_number;
+			} else {
+				/* It's a data chunk */
+				yaffs_put_chunk_in_file(object, tags.chunk_id,
+							new_chunk, 0);
+			}
 		}
+	}
+	if (ret_val == YAFFS_OK)
+		yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
+	return ret_val;
+}
 
-		memset(buffer, 0xFF, dev->nDataBytesPerChunk);
+static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
+{
+	int old_chunk;
+	int ret_val = YAFFS_OK;
+	int i;
+	int is_checkpt_block;
+	int max_copies;
+	int chunks_before = yaffs_get_erased_chunks(dev);
+	int chunks_after;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
 
-		oh->type = in->variantType;
-		oh->yst_mode = in->yst_mode;
-		oh->shadowsObject = shadows;
+	is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
 
-#ifdef CONFIG_YAFFS_WINCE
-		oh->win_atime[0] = in->win_atime[0];
-		oh->win_ctime[0] = in->win_ctime[0];
-		oh->win_mtime[0] = in->win_mtime[0];
-		oh->win_atime[1] = in->win_atime[1];
-		oh->win_ctime[1] = in->win_ctime[1];
-		oh->win_mtime[1] = in->win_mtime[1];
-#else
-		oh->yst_uid = in->yst_uid;
-		oh->yst_gid = in->yst_gid;
-		oh->yst_atime = in->yst_atime;
-		oh->yst_mtime = in->yst_mtime;
-		oh->yst_ctime = in->yst_ctime;
-		oh->yst_rdev = in->yst_rdev;
-#endif
-		if (in->parent) {
-			oh->parentObjectId = in->parent->objectId;
-		} else {
-			oh->parentObjectId = 0;
-		}
-
-		if (name && *name) {
-			memset(oh->name, 0, sizeof(oh->name));
-			yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
-		} else if (prevChunkId>=0) {
-			memcpy(oh->name, oldName, sizeof(oh->name));
-		} else {
-			memset(oh->name, 0, sizeof(oh->name));
-		}
+	yaffs_trace(YAFFS_TRACE_TRACING,
+		"Collecting block %d, in use %d, shrink %d, whole_block %d",
+		block, bi->pages_in_use, bi->has_shrink_hdr,
+		whole_block);
 
-		oh->isShrink = isShrink;
+	/*yaffs_verify_free_chunks(dev); */
 
-		switch (in->variantType) {
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-			/* Should not happen */
-			break;
-		case YAFFS_OBJECT_TYPE_FILE:
-			oh->fileSize =
-			    (oh->parentObjectId == YAFFS_OBJECTID_DELETED
-			     || oh->parentObjectId ==
-			     YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
-			    fileVariant.fileSize;
-			break;
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-			oh->equivalentObjectId =
-			    in->variant.hardLinkVariant.equivalentObjectId;
-			break;
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-			/* Do nothing */
-			break;
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			/* Do nothing */
-			break;
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-			yaffs_strncpy(oh->alias,
-				      in->variant.symLinkVariant.alias,
-				      YAFFS_MAX_ALIAS_LENGTH);
-			oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
-			break;
-		}
+	if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
+		bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
 
-		/* Tags */
-		yaffs_InitialiseTags(&newTags);
-		in->serial++;
-		newTags.chunkId = 0;
-		newTags.objectId = in->objectId;
-		newTags.serialNumber = in->serial;
+	bi->has_shrink_hdr = 0;	/* clear the flag so that the block can erase */
 
-		/* Add extra info for file header */
+	dev->gc_disable = 1;
 
-		newTags.extraHeaderInfoAvailable = 1;
-		newTags.extraParentObjectId = oh->parentObjectId;
-		newTags.extraFileLength = oh->fileSize;
-		newTags.extraIsShrinkHeader = oh->isShrink;
-		newTags.extraEquivalentObjectId = oh->equivalentObjectId;
-		newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
-		newTags.extraObjectType = in->variantType;
+	yaffs_summary_gc(dev, block);
 
-		yaffs_VerifyObjectHeader(in,oh,&newTags,1);
+	if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"Collecting block %d that has no chunks in use",
+			block);
+		yaffs_block_became_dirty(dev, block);
+	} else {
 
-		/* Create new chunk in NAND */
-		newChunkId =
-		    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-						      (prevChunkId >= 0) ? 1 : 0);
+		u8 *buffer = yaffs_get_temp_buffer(dev);
 
-		if (newChunkId >= 0) {
+		yaffs_verify_blk(dev, bi, block);
 
-			in->chunkId = newChunkId;
+		max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
+		old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
 
-			if (prevChunkId >= 0) {
-				yaffs_DeleteChunk(dev, prevChunkId, 1,
-						  __LINE__);
+		for (/* init already done */ ;
+		     ret_val == YAFFS_OK &&
+		     dev->gc_chunk < dev->param.chunks_per_block &&
+		     (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
+		     max_copies > 0;
+		     dev->gc_chunk++, old_chunk++) {
+			if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+				/* Page is in use and might need to be copied */
+				max_copies--;
+				ret_val = yaffs_gc_process_chunk(dev, bi,
+							old_chunk, buffer);
 			}
+		}
+		yaffs_release_temp_buffer(dev, buffer);
+	}
 
-			if(!yaffs_ObjectHasCachedWriteData(in))
-				in->dirty = 0;
+	yaffs_verify_collected_blk(dev, bi, block);
 
-			/* If this was a shrink, then mark the block that the chunk lives on */
-			if (isShrink) {
-				bi = yaffs_GetBlockInfo(in->myDev,
-							newChunkId /in->myDev->	nChunksPerBlock);
-				bi->hasShrinkHeader = 1;
+	if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+		/*
+		 * The gc did not complete. Set block state back to FULL
+		 * because checkpointing does not restore gc.
+		 */
+		bi->block_state = YAFFS_BLOCK_STATE_FULL;
+	} else {
+		/* The gc completed. */
+		/* Do any required cleanups */
+		for (i = 0; i < dev->n_clean_ups; i++) {
+			/* Time to delete the file too */
+			struct yaffs_obj *object =
+			    yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
+			if (object) {
+				yaffs_free_tnode(dev,
+					  object->variant.file_variant.top);
+				object->variant.file_variant.top = NULL;
+				yaffs_trace(YAFFS_TRACE_GC,
+					"yaffs: About to finally delete object %d",
+					object->obj_id);
+				yaffs_generic_obj_del(object);
+				object->my_dev->n_deleted_files--;
 			}
 
 		}
-
-		retVal = newChunkId;
-
+		chunks_after = yaffs_get_erased_chunks(dev);
+		if (chunks_before >= chunks_after)
+			yaffs_trace(YAFFS_TRACE_GC,
+				"gc did not increase free chunks before %d after %d",
+				chunks_before, chunks_after);
+		dev->gc_block = 0;
+		dev->gc_chunk = 0;
+		dev->n_clean_ups = 0;
 	}
 
-	if (buffer)
-		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+	dev->gc_disable = 0;
 
-	return retVal;
+	return ret_val;
 }
 
-/*------------------------ Short Operations Cache ----------------------------------------
- *   In many situations where there is no high level buffering (eg WinCE) a lot of
- *   reads might be short sequential reads, and a lot of writes may be short
- *   sequential writes. eg. scanning/writing a jpeg file.
- *   In these cases, a short read/write cache can provide a huge perfomance benefit
- *   with dumb-as-a-rock code.
- *   In Linux, the page cache provides read buffering aand the short op cache provides write
- *   buffering.
- *
- *   There are a limited number (~10) of cache chunks per device so that we don't
- *   need a very intelligent search.
+/*
+ * find_gc_block() selects the dirtiest block (or close enough)
+ * for garbage collection.
  */
 
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
+static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
+				    int aggressive, int background)
 {
-	yaffs_Device *dev = obj->myDev;
 	int i;
-	yaffs_ChunkCache *cache;
-	int nCaches = obj->myDev->nShortOpCaches;
-
-	for(i = 0; i < nCaches; i++){
-		cache = &dev->srCache[i];
-		if (cache->object == obj &&
-		    cache->dirty)
-			return 1;
-	}
-
-	return 0;
-}
-
+	int iterations;
+	unsigned selected = 0;
+	int prioritised = 0;
+	int prioritised_exist = 0;
+	struct yaffs_block_info *bi;
+	int threshold;
 
-static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
-{
-	yaffs_Device *dev = obj->myDev;
-	int lowest = -99;	/* Stop compiler whining. */
-	int i;
-	yaffs_ChunkCache *cache;
-	int chunkWritten = 0;
-	int nCaches = obj->myDev->nShortOpCaches;
-
-	if (nCaches > 0) {
-		do {
-			cache = NULL;
-
-			/* Find the dirty cache for this object with the lowest chunk id. */
-			for (i = 0; i < nCaches; i++) {
-				if (dev->srCache[i].object == obj &&
-				    dev->srCache[i].dirty) {
-					if (!cache
-					    || dev->srCache[i].chunkId <
-					    lowest) {
-						cache = &dev->srCache[i];
-						lowest = cache->chunkId;
-					}
+	/* First let's see if we need to grab a prioritised block */
+	if (dev->has_pending_prioritised_gc && !aggressive) {
+		dev->gc_dirtiest = 0;
+		bi = dev->block_info;
+		for (i = dev->internal_start_block;
+		     i <= dev->internal_end_block && !selected; i++) {
+
+			if (bi->gc_prioritise) {
+				prioritised_exist = 1;
+				if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+				    yaffs_block_ok_for_gc(dev, bi)) {
+					selected = i;
+					prioritised = 1;
 				}
 			}
-
-			if (cache && !cache->locked) {
-				/* Write it out and free it up */
-
-				chunkWritten =
-				    yaffs_WriteChunkDataToObject(cache->object,
-								 cache->chunkId,
-								 cache->data,
-								 cache->nBytes,
-								 1);
-				cache->dirty = 0;
-				cache->object = NULL;
-			}
-
-		} while (cache && chunkWritten > 0);
-
-		if (cache) {
-			/* Hoosterman, disk full while writing cache out. */
-			T(YAFFS_TRACE_ERROR,
-			  (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
-
+			bi++;
 		}
-	}
 
-}
+		/*
+		 * If there is a prioritised block and none was selected then
+		 * this happened because there is at least one old dirty block
+		 * gumming up the works. Let's gc the oldest dirty block.
+		 */
 
-/*yaffs_FlushEntireDeviceCache(dev)
- *
- *
- */
+		if (prioritised_exist &&
+		    !selected && dev->oldest_dirty_block > 0)
+			selected = dev->oldest_dirty_block;
 
-void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
-{
-	yaffs_Object *obj;
-	int nCaches = dev->nShortOpCaches;
-	int i;
+		if (!prioritised_exist)	/* None found, so we can clear this */
+			dev->has_pending_prioritised_gc = 0;
+	}
 
-	/* Find a dirty object in the cache and flush it...
-	 * until there are no further dirty objects.
+	/* If we're doing aggressive GC then we are happy to take a less-dirty
+	 * block, and search harder.
+	 * else (leasurely gc), then we only bother to do this if the
+	 * block has only a few pages in use.
 	 */
-	do {
-		obj = NULL;
-		for( i = 0; i < nCaches && !obj; i++) {
-			if (dev->srCache[i].object &&
-			    dev->srCache[i].dirty)
-				obj = dev->srCache[i].object;
 
-		}
-		if(obj)
-			yaffs_FlushFilesChunkCache(obj);
+	if (!selected) {
+		int pages_used;
+		int n_blocks =
+		    dev->internal_end_block - dev->internal_start_block + 1;
+		if (aggressive) {
+			threshold = dev->param.chunks_per_block;
+			iterations = n_blocks;
+		} else {
+			int max_threshold;
 
-	} while(obj);
+			if (background)
+				max_threshold = dev->param.chunks_per_block / 2;
+			else
+				max_threshold = dev->param.chunks_per_block / 8;
 
-}
+			if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+				max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
 
+			threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
+			if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+				threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+			if (threshold > max_threshold)
+				threshold = max_threshold;
 
-/* Grab us a cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
-{
-	int i;
-	int usage;
-	int theOne;
+			iterations = n_blocks / 16 + 1;
+			if (iterations > 100)
+				iterations = 100;
+		}
 
-	if (dev->nShortOpCaches > 0) {
-		for (i = 0; i < dev->nShortOpCaches; i++) {
-			if (!dev->srCache[i].object)
-				return &dev->srCache[i];
+		for (i = 0;
+		     i < iterations &&
+		     (dev->gc_dirtiest < 1 ||
+		      dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
+		     i++) {
+			dev->gc_block_finder++;
+			if (dev->gc_block_finder < dev->internal_start_block ||
+			    dev->gc_block_finder > dev->internal_end_block)
+				dev->gc_block_finder =
+				    dev->internal_start_block;
+
+			bi = yaffs_get_block_info(dev, dev->gc_block_finder);
+
+			pages_used = bi->pages_in_use - bi->soft_del_pages;
+
+			if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+			    pages_used < dev->param.chunks_per_block &&
+			    (dev->gc_dirtiest < 1 ||
+			     pages_used < dev->gc_pages_in_use) &&
+			    yaffs_block_ok_for_gc(dev, bi)) {
+				dev->gc_dirtiest = dev->gc_block_finder;
+				dev->gc_pages_in_use = pages_used;
+			}
 		}
 
-		return NULL;
+		if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
+			selected = dev->gc_dirtiest;
+	}
 
-		theOne = -1;
-		usage = 0;	/* just to stop the compiler grizzling */
+	/*
+	 * If nothing has been selected for a while, try the oldest dirty
+	 * because that's gumming up the works.
+	 */
 
-		for (i = 0; i < dev->nShortOpCaches; i++) {
-			if (!dev->srCache[i].dirty &&
-			    ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
-			     theOne < 0)) {
-				usage = dev->srCache[i].lastUse;
-				theOne = i;
-			}
+	if (!selected && dev->param.is_yaffs2 &&
+	    dev->gc_not_done >= (background ? 10 : 20)) {
+		yaffs2_find_oldest_dirty_seq(dev);
+		if (dev->oldest_dirty_block > 0) {
+			selected = dev->oldest_dirty_block;
+			dev->gc_dirtiest = selected;
+			dev->oldest_dirty_gc_count++;
+			bi = yaffs_get_block_info(dev, selected);
+			dev->gc_pages_in_use =
+			    bi->pages_in_use - bi->soft_del_pages;
+		} else {
+			dev->gc_not_done = 0;
 		}
+	}
+
+	if (selected) {
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC Selected block %d with %d free, prioritised:%d",
+			selected,
+			dev->param.chunks_per_block - dev->gc_pages_in_use,
+			prioritised);
 
+		dev->n_gc_blocks++;
+		if (background)
+			dev->bg_gcs++;
 
-		return theOne >= 0 ? &dev->srCache[theOne] : NULL;
+		dev->gc_dirtiest = 0;
+		dev->gc_pages_in_use = 0;
+		dev->gc_not_done = 0;
+		if (dev->refresh_skip > 0)
+			dev->refresh_skip--;
 	} else {
-		return NULL;
+		dev->gc_not_done++;
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
+			dev->gc_block_finder, dev->gc_not_done, threshold,
+			dev->gc_dirtiest, dev->gc_pages_in_use,
+			dev->oldest_dirty_block, background ? " bg" : "");
 	}
 
+	return selected;
 }
 
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and only accepts more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_check_gc(struct yaffs_dev *dev, int background)
 {
-	yaffs_ChunkCache *cache;
-	yaffs_Object *theObj;
-	int usage;
-	int i;
+	int aggressive = 0;
+	int gc_ok = YAFFS_OK;
+	int max_tries = 0;
+	int min_erased;
+	int erased_chunks;
+	int checkpt_block_adjust;
 
-	if (dev->nShortOpCaches > 0) {
-		/* Try find a non-dirty one... */
+	if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
+		return YAFFS_OK;
 
-		cache = yaffs_GrabChunkCacheWorker(dev);
+	if (dev->gc_disable)
+		/* Bail out so we don't get recursive gc */
+		return YAFFS_OK;
 
-		if (!cache) {
-			/* They were all dirty, find the last recently used object and flush
-			 * its cache, then  find again.
-			 * NB what's here is not very accurate, we actually flush the object
-			 * the last recently used page.
-			 */
+	/* This loop should pass the first time.
+	 * Only loops here if the collection does not increase space.
+	 */
 
-			/* With locking we can't assume we can use entry zero */
+	do {
+		max_tries++;
 
-			theObj = NULL;
-			usage = -1;
-			cache = NULL;
+		checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
 
-			for (i = 0; i < dev->nShortOpCaches; i++) {
-				if (dev->srCache[i].object &&
-				    !dev->srCache[i].locked &&
-				    (dev->srCache[i].lastUse < usage || !cache))
-				{
-					usage = dev->srCache[i].lastUse;
-					theObj = dev->srCache[i].object;
-					cache = &dev->srCache[i];
-				}
-			}
+		min_erased =
+		    dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
+		erased_chunks =
+		    dev->n_erased_blocks * dev->param.chunks_per_block;
 
-			if (!cache || cache->dirty) {
-				/* Flush and try again */
-				yaffs_FlushFilesChunkCache(theObj);
-				cache = yaffs_GrabChunkCacheWorker(dev);
+		/* If we need a block soon then do aggressive gc. */
+		if (dev->n_erased_blocks < min_erased)
+			aggressive = 1;
+		else {
+			if (!background
+			    && erased_chunks > (dev->n_free_chunks / 4))
+				break;
+
+			if (dev->gc_skip > 20)
+				dev->gc_skip = 20;
+			if (erased_chunks < dev->n_free_chunks / 2 ||
+			    dev->gc_skip < 1 || background)
+				aggressive = 0;
+			else {
+				dev->gc_skip--;
+				break;
 			}
-
 		}
-		return cache;
-	} else
-		return NULL;
 
-}
+		dev->gc_skip = 5;
 
-/* Find a cached chunk */
-static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
-					      int chunkId)
-{
-	yaffs_Device *dev = obj->myDev;
-	int i;
-	if (dev->nShortOpCaches > 0) {
-		for (i = 0; i < dev->nShortOpCaches; i++) {
-			if (dev->srCache[i].object == obj &&
-			    dev->srCache[i].chunkId == chunkId) {
-				dev->cacheHits++;
+		/* If we don't already have a block being gc'd then see if we
+		 * should start another */
 
-				return &dev->srCache[i];
-			}
+		if (dev->gc_block < 1 && !aggressive) {
+			dev->gc_block = yaffs2_find_refresh_block(dev);
+			dev->gc_chunk = 0;
+			dev->n_clean_ups = 0;
 		}
-	}
-	return NULL;
-}
-
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
-				int isAWrite)
-{
-
-	if (dev->nShortOpCaches > 0) {
-		if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
-			/* Reset the cache usages */
-			int i;
-			for (i = 1; i < dev->nShortOpCaches; i++) {
-				dev->srCache[i].lastUse = 0;
-			}
-			dev->srLastUse = 0;
+		if (dev->gc_block < 1) {
+			dev->gc_block =
+			    yaffs_find_gc_block(dev, aggressive, background);
+			dev->gc_chunk = 0;
+			dev->n_clean_ups = 0;
 		}
 
-		dev->srLastUse++;
+		if (dev->gc_block > 0) {
+			dev->all_gcs++;
+			if (!aggressive)
+				dev->passive_gc_count++;
 
-		cache->lastUse = dev->srLastUse;
+			yaffs_trace(YAFFS_TRACE_GC,
+				"yaffs: GC n_erased_blocks %d aggressive %d",
+				dev->n_erased_blocks, aggressive);
 
-		if (isAWrite) {
-			cache->dirty = 1;
+			gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
 		}
-	}
-}
-
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
-{
-	if (object->myDev->nShortOpCaches > 0) {
-		yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
 
-		if (cache) {
-			cache->object = NULL;
+		if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
+		    dev->gc_block > 0) {
+			yaffs_trace(YAFFS_TRACE_GC,
+				"yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
+				dev->n_erased_blocks, max_tries,
+				dev->gc_block);
 		}
-	}
-}
+	} while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
+		 (dev->gc_block > 0) && (max_tries < 2));
 
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
-{
-	int i;
-	yaffs_Device *dev = in->myDev;
-
-	if (dev->nShortOpCaches > 0) {
-		/* Invalidate it. */
-		for (i = 0; i < dev->nShortOpCaches; i++) {
-			if (dev->srCache[i].object == in) {
-				dev->srCache[i].object = NULL;
-			}
-		}
-	}
+	return aggressive ? gc_ok : YAFFS_OK;
 }
 
-/*--------------------- Checkpointing --------------------*/
-
-
-static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
+/*
+ * yaffs_bg_gc()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
 {
-	yaffs_CheckpointValidity cp;
+	int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
 
-	memset(&cp,0,sizeof(cp));
+	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
 
-	cp.structType = sizeof(cp);
-	cp.magic = YAFFS_MAGIC;
-	cp.version = YAFFS_CHECKPOINT_VERSION;
-	cp.head = (head) ? 1 : 0;
-
-	return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
-		1 : 0;
+	yaffs_check_gc(dev, 1);
+	return erased_chunks > dev->n_free_chunks / 2;
 }
 
-static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
-{
-	yaffs_CheckpointValidity cp;
-	int ok;
-
-	ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
-
-	if(ok)
-		ok = (cp.structType == sizeof(cp)) &&
-		     (cp.magic == YAFFS_MAGIC) &&
-		     (cp.version == YAFFS_CHECKPOINT_VERSION) &&
-		     (cp.head == ((head) ? 1 : 0));
-	return ok ? 1 : 0;
-}
+/*-------------------- Data file manipulation -----------------*/
 
-static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
-					   yaffs_Device *dev)
+static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
 {
-	cp->nErasedBlocks = dev->nErasedBlocks;
-	cp->allocationBlock = dev->allocationBlock;
-	cp->allocationPage = dev->allocationPage;
-	cp->nFreeChunks = dev->nFreeChunks;
+	int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
 
-	cp->nDeletedFiles = dev->nDeletedFiles;
-	cp->nUnlinkedFiles = dev->nUnlinkedFiles;
-	cp->nBackgroundDeletions = dev->nBackgroundDeletions;
-	cp->sequenceNumber = dev->sequenceNumber;
-	cp->oldestDirtySequence = dev->oldestDirtySequence;
+	if (nand_chunk >= 0)
+		return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
+						buffer, NULL);
+	else {
+		yaffs_trace(YAFFS_TRACE_NANDACCESS,
+			"Chunk %d not found zero instead",
+			nand_chunk);
+		/* get sane (zero) data if you read a hole */
+		memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
+		return 0;
+	}
 
 }
 
-static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
-					   yaffs_CheckpointDevice *cp)
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+		     int lyn)
 {
-	dev->nErasedBlocks = cp->nErasedBlocks;
-	dev->allocationBlock = cp->allocationBlock;
-	dev->allocationPage = cp->allocationPage;
-	dev->nFreeChunks = cp->nFreeChunks;
+	int block;
+	int page;
+	struct yaffs_ext_tags tags;
+	struct yaffs_block_info *bi;
 
-	dev->nDeletedFiles = cp->nDeletedFiles;
-	dev->nUnlinkedFiles = cp->nUnlinkedFiles;
-	dev->nBackgroundDeletions = cp->nBackgroundDeletions;
-	dev->sequenceNumber = cp->sequenceNumber;
-	dev->oldestDirtySequence = cp->oldestDirtySequence;
-}
+	if (chunk_id <= 0)
+		return;
 
+	dev->n_deletions++;
+	block = chunk_id / dev->param.chunks_per_block;
+	page = chunk_id % dev->param.chunks_per_block;
 
-static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
-{
-	yaffs_CheckpointDevice cp;
-	__u32 nBytes;
-	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+	if (!yaffs_check_chunk_bit(dev, block, page))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Deleting invalid chunk %d", chunk_id);
 
-	int ok;
+	bi = yaffs_get_block_info(dev, block);
 
-	/* Write device runtime values*/
-	yaffs_DeviceToCheckpointDevice(&cp,dev);
-	cp.structType = sizeof(cp);
+	yaffs2_update_oldest_dirty_seq(dev, block, bi);
 
-	ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
+	yaffs_trace(YAFFS_TRACE_DELETION,
+		"line %d delete of chunk %d",
+		lyn, chunk_id);
 
-	/* Write block info */
-	if(ok) {
-		nBytes = nBlocks * sizeof(yaffs_BlockInfo);
-		ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
-	}
+	if (!dev->param.is_yaffs2 && mark_flash &&
+	    bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
 
-	/* Write chunk bits */
-	if(ok) {
-		nBytes = nBlocks * dev->chunkBitmapStride;
-		ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
+		memset(&tags, 0, sizeof(tags));
+		tags.is_deleted = 1;
+		yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
+		yaffs_handle_chunk_update(dev, chunk_id, &tags);
+	} else {
+		dev->n_unmarked_deletions++;
 	}
-	return	 ok ? 1 : 0;
 
+	/* Pull out of the management area.
+	 * If the whole block became dirty, this will kick off an erasure.
+	 */
+	if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
+	    bi->block_state == YAFFS_BLOCK_STATE_FULL ||
+	    bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+	    bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+		dev->n_free_chunks++;
+		yaffs_clear_chunk_bit(dev, block, page);
+		bi->pages_in_use--;
+
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
+		    bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			yaffs_block_became_dirty(dev, block);
+		}
+	}
 }
 
-static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+			     const u8 *buffer, int n_bytes, int use_reserve)
 {
-	yaffs_CheckpointDevice cp;
-	__u32 nBytes;
-	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+	/* Find old chunk Need to do this to get serial number
+	 * Write new one and patch into tree.
+	 * Invalidate old tags.
+	 */
 
-	int ok;
+	int prev_chunk_id;
+	struct yaffs_ext_tags prev_tags;
+	int new_chunk_id;
+	struct yaffs_ext_tags new_tags;
+	struct yaffs_dev *dev = in->my_dev;
 
-	ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
-	if(!ok)
-		return 0;
+	yaffs_check_gc(dev, 0);
 
-	if(cp.structType != sizeof(cp))
+	/* Get the previous chunk at this location in the file if it exists.
+	 * If it does not exist then put a zero into the tree. This creates
+	 * the tnode now, rather than later when it is harder to clean up.
+	 */
+	prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
+	if (prev_chunk_id < 1 &&
+	    !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
 		return 0;
 
+	/* Set up new tags */
+	memset(&new_tags, 0, sizeof(new_tags));
 
-	yaffs_CheckpointDeviceToDevice(dev,&cp);
+	new_tags.chunk_id = inode_chunk;
+	new_tags.obj_id = in->obj_id;
+	new_tags.serial_number =
+	    (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
+	new_tags.n_bytes = n_bytes;
 
-	nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+	if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+		  "Writing %d bytes to chunk!!!!!!!!!",
+		   n_bytes);
+		BUG();
+	}
 
-	ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
+	new_chunk_id =
+	    yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
 
-	if(!ok)
-		return 0;
-	nBytes = nBlocks * dev->chunkBitmapStride;
+	if (new_chunk_id > 0) {
+		yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
 
-	ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
+		if (prev_chunk_id > 0)
+			yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
 
-	return ok ? 1 : 0;
-}
+		yaffs_verify_file_sane(in);
+	}
+	return new_chunk_id;
 
-static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
-					   yaffs_Object *obj)
-{
+}
 
-	cp->objectId = obj->objectId;
-	cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
-	cp->chunkId = obj->chunkId;
-	cp->variantType = obj->variantType;
-	cp->deleted = obj->deleted;
-	cp->softDeleted = obj->softDeleted;
-	cp->unlinked = obj->unlinked;
-	cp->fake = obj->fake;
-	cp->renameAllowed = obj->renameAllowed;
-	cp->unlinkAllowed = obj->unlinkAllowed;
-	cp->serial = obj->serial;
-	cp->nDataChunks = obj->nDataChunks;
 
-	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-		cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
-	else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-		cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
-}
 
-static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
+static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
+				const YCHAR *name, const void *value, int size,
+				int flags)
 {
+	struct yaffs_xattr_mod xmod;
+	int result;
 
-	yaffs_Object *parent;
+	xmod.set = set;
+	xmod.name = name;
+	xmod.data = value;
+	xmod.size = size;
+	xmod.flags = flags;
+	xmod.result = -ENOSPC;
 
-	obj->objectId = cp->objectId;
+	result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
 
-	if(cp->parentId)
-		parent = yaffs_FindOrCreateObjectByNumber(
-					obj->myDev,
-					cp->parentId,
-					YAFFS_OBJECT_TYPE_DIRECTORY);
+	if (result > 0)
+		return xmod.result;
 	else
-		parent = NULL;
-
-	if(parent)
-		yaffs_AddObjectToDirectory(parent, obj);
-
-	obj->chunkId = cp->chunkId;
-	obj->variantType = cp->variantType;
-	obj->deleted = cp->deleted;
-	obj->softDeleted = cp->softDeleted;
-	obj->unlinked = cp->unlinked;
-	obj->fake = cp->fake;
-	obj->renameAllowed = cp->renameAllowed;
-	obj->unlinkAllowed = cp->unlinkAllowed;
-	obj->serial = cp->serial;
-	obj->nDataChunks = cp->nDataChunks;
-
-	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-		obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
-	else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-		obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
-
-	if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
-		obj->lazyLoaded = 1;
+		return -ENOSPC;
 }
 
-
-
-static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
-					__u32 level, int chunkOffset)
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+				   struct yaffs_xattr_mod *xmod)
 {
-	int i;
-	yaffs_Device *dev = in->myDev;
-	int ok = 1;
-	int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-	if (tn) {
-		if (level > 0) {
-
-			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
-				if (tn->internal[i]) {
-					ok = yaffs_CheckpointTnodeWorker(in,
-							tn->internal[i],
-							level - 1,
-							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
-				}
-			}
-		} else if (level == 0) {
-			__u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
-			/* printf("write tnode at %d\n",baseOffset); */
-			ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
-			if(ok)
-				ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
-		}
-	}
+	int retval = 0;
+	int x_offs = sizeof(struct yaffs_obj_hdr);
+	struct yaffs_dev *dev = obj->my_dev;
+	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+	char *x_buffer = buffer + x_offs;
 
-	return ok;
+	if (xmod->set)
+		retval =
+		    nval_set(x_buffer, x_size, xmod->name, xmod->data,
+			     xmod->size, xmod->flags);
+	else
+		retval = nval_del(x_buffer, x_size, xmod->name);
 
-}
+	obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+	obj->xattr_known = 1;
+	xmod->result = retval;
 
-static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
-{
-	__u32 endMarker = ~0;
-	int ok = 1;
-
-	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
-		ok = yaffs_CheckpointTnodeWorker(obj,
-					    obj->variant.fileVariant.top,
-					    obj->variant.fileVariant.topLevel,
-					    0);
-		if(ok)
-			ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
-				sizeof(endMarker));
-	}
-
-	return ok ? 1 : 0;
+	return retval;
 }
 
-static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
+static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
+				  void *value, int size)
 {
-	__u32 baseChunk;
-	int ok = 1;
-	yaffs_Device *dev = obj->myDev;
-	yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
-	yaffs_Tnode *tn;
-	int nread = 0;
+	char *buffer = NULL;
+	int result;
+	struct yaffs_ext_tags tags;
+	struct yaffs_dev *dev = obj->my_dev;
+	int x_offs = sizeof(struct yaffs_obj_hdr);
+	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+	char *x_buffer;
+	int retval = 0;
 
-	ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
+	if (obj->hdr_chunk < 1)
+		return -ENODATA;
 
-	while(ok && (~baseChunk)){
-		nread++;
-		/* Read level 0 tnode */
+	/* If we know that the object has no xattribs then don't do all the
+	 * reading and parsing.
+	 */
+	if (obj->xattr_known && !obj->has_xattr) {
+		if (name)
+			return -ENODATA;
+		else
+			return 0;
+	}
 
+	buffer = (char *)yaffs_get_temp_buffer(dev);
+	if (!buffer)
+		return -ENOMEM;
 
-		/* printf("read  tnode at %d\n",baseChunk); */
-		tn = yaffs_GetTnodeRaw(dev);
-		if(tn)
-			ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
-			      (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
-		else
-			ok = 0;
+	result =
+	    yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
 
-		if(tn && ok){
-			ok = yaffs_AddOrFindLevel0Tnode(dev,
-							fileStructPtr,
-							baseChunk,
-							tn) ? 1 : 0;
+	if (result != YAFFS_OK)
+		retval = -ENOENT;
+	else {
+		x_buffer = buffer + x_offs;
 
+		if (!obj->xattr_known) {
+			obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+			obj->xattr_known = 1;
 		}
 
-		if(ok)
-			ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
-
+		if (name)
+			retval = nval_get(x_buffer, x_size, name, value, size);
+		else
+			retval = nval_list(x_buffer, x_size, value, size);
 	}
-
-	T(YAFFS_TRACE_CHECKPOINT,(
-		TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
-		nread,baseChunk,ok));
-
-	return ok ? 1 : 0;
+	yaffs_release_temp_buffer(dev, (u8 *) buffer);
+	return retval;
 }
 
-
-static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+		      const void *value, int size, int flags)
 {
-	yaffs_Object *obj;
-	yaffs_CheckpointObject cp;
-	int i;
-	int ok = 1;
-	struct list_head *lh;
-
-
-	/* Iterate through the objects in each hash entry,
-	 * dumping them to the checkpointing stream.
-	 */
-
-	 for(i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++){
-		list_for_each(lh, &dev->objectBucket[i].list) {
-			if (lh) {
-				obj = list_entry(lh, yaffs_Object, hashLink);
-				if (!obj->deferedFree) {
-					yaffs_ObjectToCheckpointObject(&cp,obj);
-					cp.structType = sizeof(cp);
-
-					T(YAFFS_TRACE_CHECKPOINT,(
-						TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
-						cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
-
-					ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
-
-					if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
-						ok = yaffs_WriteCheckpointTnodes(obj);
-					}
-				}
-			}
-		}
-	 }
-
-	 /* Dump end of list */
-	memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
-	cp.structType = sizeof(cp);
-
-	if(ok)
-		ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
-
-	return ok ? 1 : 0;
+	return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
 }
 
-static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
 {
-	yaffs_Object *obj;
-	yaffs_CheckpointObject cp;
-	int ok = 1;
-	int done = 0;
-	yaffs_Object *hardList = NULL;
-
-	while(ok && !done) {
-		ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
-		if(cp.structType != sizeof(cp)) {
-			T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
-				cp.structType,sizeof(cp),ok));
-			ok = 0;
-		}
-
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
-			cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
-
-		if(ok && cp.objectId == ~0)
-			done = 1;
-		else if(ok){
-			obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
-			if(obj) {
-				yaffs_CheckpointObjectToObject(obj,&cp);
-				if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-					ok = yaffs_ReadCheckpointTnodes(obj);
-				} else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-					obj->hardLinks.next =
-						    (struct list_head *)
-						    hardList;
-					hardList = obj;
-				}
-
-			}
-		}
-	}
-
-	if(ok)
-		yaffs_HardlinkFixup(dev,hardList);
-
-	return ok ? 1 : 0;
+	return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
 }
 
-static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+		      int size)
 {
-	__u32 checkpointSum;
-	int ok;
-
-	yaffs_GetCheckpointSum(dev,&checkpointSum);
-
-	ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
-
-	if(!ok)
-		return 0;
-
-	return 1;
+	return yaffs_do_xattrib_fetch(obj, name, value, size);
 }
 
-static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
 {
-	__u32 checkpointSum0;
-	__u32 checkpointSum1;
-	int ok;
-
-	yaffs_GetCheckpointSum(dev,&checkpointSum0);
-
-	ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+	return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
+}
 
-	if(!ok)
-		return 0;
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
+{
+	u8 *buf;
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_dev *dev;
+	struct yaffs_ext_tags tags;
+	int result;
+	int alloc_failed = 0;
 
-	if(checkpointSum0 != checkpointSum1)
-		return 0;
+	if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
+		return;
 
-	return 1;
+	dev = in->my_dev;
+	in->lazy_loaded = 0;
+	buf = yaffs_get_temp_buffer(dev);
+
+	result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
+	oh = (struct yaffs_obj_hdr *)buf;
+
+	in->yst_mode = oh->yst_mode;
+	yaffs_load_attribs(in, oh);
+	yaffs_set_obj_name_from_oh(in, oh);
+
+	if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		in->variant.symlink_variant.alias =
+		    yaffs_clone_str(oh->alias);
+		if (!in->variant.symlink_variant.alias)
+			alloc_failed = 1;	/* Not returned */
+	}
+	yaffs_release_temp_buffer(dev, buf);
+}
+
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
+				    const YCHAR *oh_name, int buff_size)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	if (dev->param.auto_unicode) {
+		if (*oh_name) {
+			/* It is an ASCII name, do an ASCII to
+			 * unicode conversion */
+			const char *ascii_oh_name = (const char *)oh_name;
+			int n = buff_size - 1;
+			while (n > 0 && *ascii_oh_name) {
+				*name = *ascii_oh_name;
+				name++;
+				ascii_oh_name++;
+				n--;
+			}
+		} else {
+			yaffs_strncpy(name, oh_name + 1, buff_size - 1);
+		}
+	} else {
+#else
+	dev = dev;
+	{
+#endif
+		yaffs_strncpy(name, oh_name, buff_size - 1);
+	}
 }
 
-
-static int yaffs_WriteCheckpointData(yaffs_Device *dev)
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
+				    const YCHAR *name)
 {
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
 
-	int ok = 1;
+	int is_ascii;
+	YCHAR *w;
 
-	if(dev->skipCheckpointWrite || !dev->isYaffs2){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
-		ok = 0;
-	}
+	if (dev->param.auto_unicode) {
 
-	if(ok)
-		ok = yaffs_CheckpointOpen(dev,1);
+		is_ascii = 1;
+		w = name;
 
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
-		ok = yaffs_WriteCheckpointValidityMarker(dev,1);
-	}
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
-		ok = yaffs_WriteCheckpointDevice(dev);
-	}
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
-		ok = yaffs_WriteCheckpointObjects(dev);
-	}
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
-		ok = yaffs_WriteCheckpointValidityMarker(dev,0);
-	}
+		/* Figure out if the name will fit in ascii character set */
+		while (is_ascii && *w) {
+			if ((*w) & 0xff00)
+				is_ascii = 0;
+			w++;
+		}
 
-	if(ok){
-		ok = yaffs_WriteCheckpointSum(dev);
+		if (is_ascii) {
+			/* It is an ASCII name, so convert unicode to ascii */
+			char *ascii_oh_name = (char *)oh_name;
+			int n = YAFFS_MAX_NAME_LENGTH - 1;
+			while (n > 0 && *name) {
+				*ascii_oh_name = *name;
+				name++;
+				ascii_oh_name++;
+				n--;
+			}
+		} else {
+			/* Unicode name, so save starting at the second YCHAR */
+			*oh_name = 0;
+			yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
+		}
+	} else {
+#else
+	dev = dev;
+	{
+#endif
+		yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
 	}
+}
 
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
+		    int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
+{
 
-	if(!yaffs_CheckpointClose(dev))
-		 ok = 0;
+	struct yaffs_block_info *bi;
+	struct yaffs_dev *dev = in->my_dev;
+	int prev_chunk_id;
+	int ret_val = 0;
+	int result = 0;
+	int new_chunk_id;
+	struct yaffs_ext_tags new_tags;
+	struct yaffs_ext_tags old_tags;
+	const YCHAR *alias = NULL;
+	u8 *buffer = NULL;
+	YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
+	struct yaffs_obj_hdr *oh = NULL;
+	loff_t file_size = 0;
 
-	if(ok)
-		dev->isCheckpointed = 1;
-	 else
-		dev->isCheckpointed = 0;
+	yaffs_strcpy(old_name, _Y("silly old name"));
 
-	return dev->isCheckpointed;
-}
+	if (in->fake && in != dev->root_dir && !force && !xmod)
+		return ret_val;
 
-static int yaffs_ReadCheckpointData(yaffs_Device *dev)
-{
-	int ok = 1;
+	yaffs_check_gc(dev, 0);
+	yaffs_check_obj_details_loaded(in);
 
-	if(dev->skipCheckpointRead || !dev->isYaffs2){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
-		ok = 0;
-	}
+	buffer = yaffs_get_temp_buffer(in->my_dev);
+	oh = (struct yaffs_obj_hdr *)buffer;
 
-	if(ok)
-		ok = yaffs_CheckpointOpen(dev,0); /* open for read */
+	prev_chunk_id = in->hdr_chunk;
 
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
-		ok = yaffs_ReadCheckpointValidityMarker(dev,1);
-	}
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
-		ok = yaffs_ReadCheckpointDevice(dev);
-	}
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
-		ok = yaffs_ReadCheckpointObjects(dev);
-	}
-	if(ok){
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
-		ok = yaffs_ReadCheckpointValidityMarker(dev,0);
-	}
+	if (prev_chunk_id > 0) {
+		result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
+						  buffer, &old_tags);
 
-	if(ok){
-		ok = yaffs_ReadCheckpointSum(dev);
-		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
+		yaffs_verify_oh(in, oh, &old_tags, 0);
+		memcpy(old_name, oh->name, sizeof(oh->name));
+		memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
+	} else {
+		memset(buffer, 0xff, dev->data_bytes_per_chunk);
 	}
 
-	if(!yaffs_CheckpointClose(dev))
-		ok = 0;
-
-	if(ok)
-		dev->isCheckpointed = 1;
-	 else
-		dev->isCheckpointed = 0;
+	oh->type = in->variant_type;
+	oh->yst_mode = in->yst_mode;
+	oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
 
-	return ok ? 1 : 0;
+	yaffs_load_attribs_oh(oh, in);
 
-}
+	if (in->parent)
+		oh->parent_obj_id = in->parent->obj_id;
+	else
+		oh->parent_obj_id = 0;
 
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
-{
-	if(dev->isCheckpointed ||
-	   dev->blocksInCheckpoint > 0){
-		dev->isCheckpointed = 0;
-		yaffs_CheckpointInvalidateStream(dev);
-		if(dev->superBlock && dev->markSuperBlockDirty)
-			dev->markSuperBlockDirty(dev->superBlock);
+	if (name && *name) {
+		memset(oh->name, 0, sizeof(oh->name));
+		yaffs_load_oh_from_name(dev, oh->name, name);
+	} else if (prev_chunk_id > 0) {
+		memcpy(oh->name, old_name, sizeof(oh->name));
+	} else {
+		memset(oh->name, 0, sizeof(oh->name));
 	}
-}
 
+	oh->is_shrink = is_shrink;
 
-int yaffs_CheckpointSave(yaffs_Device *dev)
-{
-
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+	switch (in->variant_type) {
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* Should not happen */
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+		if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
+		    oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
+			file_size = in->variant.file_variant.file_size;
+		yaffs_oh_size_load(oh, file_size);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		oh->equiv_id = in->variant.hardlink_variant.equiv_id;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		/* Do nothing */
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		/* Do nothing */
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = in->variant.symlink_variant.alias;
+		if (!alias)
+			alias = _Y("no alias");
+		yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
+		oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+		break;
+	}
 
-	yaffs_VerifyObjects(dev);
-	yaffs_VerifyBlocks(dev);
-	yaffs_VerifyFreeChunks(dev);
+	/* process any xattrib modifications */
+	if (xmod)
+		yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
+
+	/* Tags */
+	memset(&new_tags, 0, sizeof(new_tags));
+	in->serial++;
+	new_tags.chunk_id = 0;
+	new_tags.obj_id = in->obj_id;
+	new_tags.serial_number = in->serial;
+
+	/* Add extra info for file header */
+	new_tags.extra_available = 1;
+	new_tags.extra_parent_id = oh->parent_obj_id;
+	new_tags.extra_file_size = file_size;
+	new_tags.extra_is_shrink = oh->is_shrink;
+	new_tags.extra_equiv_id = oh->equiv_id;
+	new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
+	new_tags.extra_obj_type = in->variant_type;
+	yaffs_verify_oh(in, oh, &new_tags, 1);
+
+	/* Create new chunk in NAND */
+	new_chunk_id =
+	    yaffs_write_new_chunk(dev, buffer, &new_tags,
+				  (prev_chunk_id > 0) ? 1 : 0);
 
-	if(!dev->isCheckpointed) {
-		yaffs_InvalidateCheckpoint(dev);
-		yaffs_WriteCheckpointData(dev);
-	}
+	if (buffer)
+		yaffs_release_temp_buffer(dev, buffer);
 
-	T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+	if (new_chunk_id < 0)
+		return new_chunk_id;
 
-	return dev->isCheckpointed;
-}
+	in->hdr_chunk = new_chunk_id;
 
-int yaffs_CheckpointRestore(yaffs_Device *dev)
-{
-	int retval;
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+	if (prev_chunk_id > 0)
+		yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
 
-	retval = yaffs_ReadCheckpointData(dev);
+	if (!yaffs_obj_cache_dirty(in))
+		in->dirty = 0;
 
-	if(dev->isCheckpointed){
-		yaffs_VerifyObjects(dev);
-		yaffs_VerifyBlocks(dev);
-		yaffs_VerifyFreeChunks(dev);
+	/* If this was a shrink, then mark the block
+	 * that the chunk lives on */
+	if (is_shrink) {
+		bi = yaffs_get_block_info(in->my_dev,
+					  new_chunk_id /
+					  in->my_dev->param.chunks_per_block);
+		bi->has_shrink_hdr = 1;
 	}
 
-	T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
 
-	return retval;
+	return new_chunk_id;
 }
 
 /*--------------------- File read/write ------------------------
@@ -4447,622 +3432,550 @@ int yaffs_CheckpointRestore(yaffs_Device *dev)
  * Curve-balls: the first chunk might also be the last chunk.
  */
 
-int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
-			   int nBytes)
+int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
 {
+	int chunk;
+	u32 start;
+	int n_copy;
+	int n = n_bytes;
+	int n_done = 0;
+	struct yaffs_cache *cache;
+	struct yaffs_dev *dev;
 
-	__u32 chunk = 0;
-	__u32 start = 0;
-	int nToCopy;
-	int n = nBytes;
-	int nDone = 0;
-	yaffs_ChunkCache *cache;
-
-	yaffs_Device *dev;
-
-	dev = in->myDev;
+	dev = in->my_dev;
 
 	while (n > 0) {
-		//chunk = offset / dev->nDataBytesPerChunk + 1;
-		//start = offset % dev->nDataBytesPerChunk;
-		yaffs_AddrToChunk(dev,offset,&chunk,&start);
+		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
 		chunk++;
 
 		/* OK now check for the curveball where the start and end are in
 		 * the same chunk.
 		 */
-		if ((start + n) < dev->nDataBytesPerChunk) {
-			nToCopy = n;
-		} else {
-			nToCopy = dev->nDataBytesPerChunk - start;
-		}
+		if ((start + n) < dev->data_bytes_per_chunk)
+			n_copy = n;
+		else
+			n_copy = dev->data_bytes_per_chunk - start;
 
-		cache = yaffs_FindChunkCache(in, chunk);
+		cache = yaffs_find_chunk_cache(in, chunk);
 
-		/* If the chunk is already in the cache or it is less than a whole chunk
-		 * then use the cache (if there is caching)
-		 * else bypass the cache.
+		/* If the chunk is already in the cache or it is less than
+		 * a whole chunk or we're using inband tags then use the cache
+		 * (if there is caching) else bypass the cache.
 		 */
-		if (cache || nToCopy != dev->nDataBytesPerChunk) {
-			if (dev->nShortOpCaches > 0) {
+		if (cache || n_copy != dev->data_bytes_per_chunk ||
+		    dev->param.inband_tags) {
+			if (dev->param.n_caches > 0) {
 
-				/* If we can't find the data in the cache, then load it up. */
+				/* If we can't find the data in the cache,
+				 * then load it up. */
 
 				if (!cache) {
-					cache = yaffs_GrabChunkCache(in->myDev);
+					cache =
+					    yaffs_grab_chunk_cache(in->my_dev);
 					cache->object = in;
-					cache->chunkId = chunk;
+					cache->chunk_id = chunk;
 					cache->dirty = 0;
 					cache->locked = 0;
-					yaffs_ReadChunkDataFromObject(in, chunk,
-								      cache->
-								      data);
-					cache->nBytes = 0;
+					yaffs_rd_data_obj(in, chunk,
+							  cache->data);
+					cache->n_bytes = 0;
 				}
 
-				yaffs_UseChunkCache(dev, cache, 0);
+				yaffs_use_cache(dev, cache, 0);
 
 				cache->locked = 1;
 
-#ifdef CONFIG_YAFFS_WINCE
-				yfsd_UnlockYAFFS(TRUE);
-#endif
-				memcpy(buffer, &cache->data[start], nToCopy);
+				memcpy(buffer, &cache->data[start], n_copy);
 
-#ifdef CONFIG_YAFFS_WINCE
-				yfsd_LockYAFFS(TRUE);
-#endif
 				cache->locked = 0;
 			} else {
-				/* Read into the local buffer then copy..*/
-
-				__u8 *localBuffer =
-				    yaffs_GetTempBuffer(dev, __LINE__);
-				yaffs_ReadChunkDataFromObject(in, chunk,
-							      localBuffer);
-#ifdef CONFIG_YAFFS_WINCE
-				yfsd_UnlockYAFFS(TRUE);
-#endif
-				memcpy(buffer, &localBuffer[start], nToCopy);
-
-#ifdef CONFIG_YAFFS_WINCE
-				yfsd_LockYAFFS(TRUE);
-#endif
-				yaffs_ReleaseTempBuffer(dev, localBuffer,
-							__LINE__);
-			}
-
-		} else {
-#ifdef CONFIG_YAFFS_WINCE
-			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-			/* Under WinCE can't do direct transfer. Need to use a local buffer.
-			 * This is because we otherwise screw up WinCE's memory mapper
-			 */
-			yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
+				/* Read into the local buffer then copy.. */
 
-#ifdef CONFIG_YAFFS_WINCE
-			yfsd_UnlockYAFFS(TRUE);
-#endif
-			memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
+				u8 *local_buffer =
+				    yaffs_get_temp_buffer(dev);
+				yaffs_rd_data_obj(in, chunk, local_buffer);
 
-#ifdef CONFIG_YAFFS_WINCE
-			yfsd_LockYAFFS(TRUE);
-			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
-#endif
+				memcpy(buffer, &local_buffer[start], n_copy);
 
-#else
-			/* A full chunk. Read directly into the supplied buffer. */
-			yaffs_ReadChunkDataFromObject(in, chunk, buffer);
-#endif
+				yaffs_release_temp_buffer(dev, local_buffer);
+			}
+		} else {
+			/* A full chunk. Read directly into the buffer. */
+			yaffs_rd_data_obj(in, chunk, buffer);
 		}
-
-		n -= nToCopy;
-		offset += nToCopy;
-		buffer += nToCopy;
-		nDone += nToCopy;
-
+		n -= n_copy;
+		offset += n_copy;
+		buffer += n_copy;
+		n_done += n_copy;
 	}
-
-	return nDone;
+	return n_done;
 }
 
-int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
-			  int nBytes, int writeThrough)
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+		     int n_bytes, int write_through)
 {
 
-	__u32 chunk = 0;
-	__u32 start = 0;
-	int nToCopy;
-	int n = nBytes;
-	int nDone = 0;
-	int nToWriteBack;
-	int startOfWrite = offset;
-	int chunkWritten = 0;
-	int nBytesRead;
-
-	yaffs_Device *dev;
-
-	dev = in->myDev;
-
-	while (n > 0 && chunkWritten >= 0) {
-		//chunk = offset / dev->nDataBytesPerChunk + 1;
-		//start = offset % dev->nDataBytesPerChunk;
-		yaffs_AddrToChunk(dev,offset,&chunk,&start);
-		chunk++;
+	int chunk;
+	u32 start;
+	int n_copy;
+	int n = n_bytes;
+	int n_done = 0;
+	int n_writeback;
+	loff_t start_write = offset;
+	int chunk_written = 0;
+	u32 n_bytes_read;
+	loff_t chunk_start;
+	struct yaffs_dev *dev;
+
+	dev = in->my_dev;
+
+	while (n > 0 && chunk_written >= 0) {
+		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+
+		if (((loff_t)chunk) *
+		    dev->data_bytes_per_chunk + start != offset ||
+		    start >= dev->data_bytes_per_chunk) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"AddrToChunk of offset %lld gives chunk %d start %d",
+				offset, chunk, start);
+		}
+		chunk++;	/* File pos to chunk in file offset */
 
 		/* OK now check for the curveball where the start and end are in
 		 * the same chunk.
 		 */
 
-		if ((start + n) < dev->nDataBytesPerChunk) {
-			nToCopy = n;
+		if ((start + n) < dev->data_bytes_per_chunk) {
+			n_copy = n;
 
-			/* Now folks, to calculate how many bytes to write back....
-			 * If we're overwriting and not writing to then end of file then
-			 * we need to write back as much as was there before.
+			/* Now calculate how many bytes to write back....
+			 * If we're overwriting and not writing to then end of
+			 * file then we need to write back as much as was there
+			 * before.
 			 */
 
-			nBytesRead =
-			    in->variant.fileVariant.fileSize -
-			    ((chunk - 1) * dev->nDataBytesPerChunk);
+			chunk_start = (((loff_t)(chunk - 1)) *
+					dev->data_bytes_per_chunk);
 
-			if (nBytesRead > dev->nDataBytesPerChunk) {
-				nBytesRead = dev->nDataBytesPerChunk;
-			}
+			if (chunk_start > in->variant.file_variant.file_size)
+				n_bytes_read = 0;	/* Past end of file */
+			else
+				n_bytes_read =
+				    in->variant.file_variant.file_size -
+				    chunk_start;
+
+			if (n_bytes_read > dev->data_bytes_per_chunk)
+				n_bytes_read = dev->data_bytes_per_chunk;
 
-			nToWriteBack =
-			    (nBytesRead >
-			     (start + n)) ? nBytesRead : (start + n);
+			n_writeback =
+			    (n_bytes_read >
+			     (start + n)) ? n_bytes_read : (start + n);
+
+			if (n_writeback < 0 ||
+			    n_writeback > dev->data_bytes_per_chunk)
+				BUG();
 
 		} else {
-			nToCopy = dev->nDataBytesPerChunk - start;
-			nToWriteBack = dev->nDataBytesPerChunk;
+			n_copy = dev->data_bytes_per_chunk - start;
+			n_writeback = dev->data_bytes_per_chunk;
 		}
 
-		if (nToCopy != dev->nDataBytesPerChunk) {
-			/* An incomplete start or end chunk (or maybe both start and end chunk) */
-			if (dev->nShortOpCaches > 0) {
-				yaffs_ChunkCache *cache;
-				/* If we can't find the data in the cache, then load the cache */
-				cache = yaffs_FindChunkCache(in, chunk);
-
-				if (!cache
-				    && yaffs_CheckSpaceForAllocation(in->
-								     myDev)) {
-					cache = yaffs_GrabChunkCache(in->myDev);
+		if (n_copy != dev->data_bytes_per_chunk ||
+		    dev->param.inband_tags) {
+			/* An incomplete start or end chunk (or maybe both
+			 * start and end chunk), or we're using inband tags,
+			 * so we want to use the cache buffers.
+			 */
+			if (dev->param.n_caches > 0) {
+				struct yaffs_cache *cache;
+
+				/* If we can't find the data in the cache, then
+				 * load the cache */
+				cache = yaffs_find_chunk_cache(in, chunk);
+
+				if (!cache &&
+				    yaffs_check_alloc_available(dev, 1)) {
+					cache = yaffs_grab_chunk_cache(dev);
 					cache->object = in;
-					cache->chunkId = chunk;
+					cache->chunk_id = chunk;
 					cache->dirty = 0;
 					cache->locked = 0;
-					yaffs_ReadChunkDataFromObject(in, chunk,
-								      cache->
-								      data);
-				}
-				else if(cache &&
-					!cache->dirty &&
-					!yaffs_CheckSpaceForAllocation(in->myDev)){
-					/* Drop the cache if it was a read cache item and
-					 * no space check has been made for it.
+					yaffs_rd_data_obj(in, chunk,
+							  cache->data);
+				} else if (cache &&
+					   !cache->dirty &&
+					   !yaffs_check_alloc_available(dev,
+									1)) {
+					/* Drop the cache if it was a read cache
+					 * item and no space check has been made
+					 * for it.
 					 */
-					 cache = NULL;
+					cache = NULL;
 				}
 
 				if (cache) {
-					yaffs_UseChunkCache(dev, cache, 1);
+					yaffs_use_cache(dev, cache, 1);
 					cache->locked = 1;
-#ifdef CONFIG_YAFFS_WINCE
-					yfsd_UnlockYAFFS(TRUE);
-#endif
 
 					memcpy(&cache->data[start], buffer,
-					       nToCopy);
+					       n_copy);
 
-#ifdef CONFIG_YAFFS_WINCE
-					yfsd_LockYAFFS(TRUE);
-#endif
 					cache->locked = 0;
-					cache->nBytes = nToWriteBack;
+					cache->n_bytes = n_writeback;
 
-					if (writeThrough) {
-						chunkWritten =
-						    yaffs_WriteChunkDataToObject
+					if (write_through) {
+						chunk_written =
+						    yaffs_wr_data_obj
 						    (cache->object,
-						     cache->chunkId,
-						     cache->data, cache->nBytes,
-						     1);
+						     cache->chunk_id,
+						     cache->data,
+						     cache->n_bytes, 1);
 						cache->dirty = 0;
 					}
-
 				} else {
-					chunkWritten = -1;	/* fail the write */
+					chunk_written = -1;	/* fail write */
 				}
 			} else {
-				/* An incomplete start or end chunk (or maybe both start and end chunk)
-				 * Read into the local buffer then copy, then copy over and write back.
+				/* An incomplete start or end chunk (or maybe
+				 * both start and end chunk). Read into the
+				 * local buffer then copy over and write back.
 				 */
 
-				__u8 *localBuffer =
-				    yaffs_GetTempBuffer(dev, __LINE__);
+				u8 *local_buffer = yaffs_get_temp_buffer(dev);
 
-				yaffs_ReadChunkDataFromObject(in, chunk,
-							      localBuffer);
+				yaffs_rd_data_obj(in, chunk, local_buffer);
+				memcpy(&local_buffer[start], buffer, n_copy);
 
-#ifdef CONFIG_YAFFS_WINCE
-				yfsd_UnlockYAFFS(TRUE);
-#endif
-
-				memcpy(&localBuffer[start], buffer, nToCopy);
-
-#ifdef CONFIG_YAFFS_WINCE
-				yfsd_LockYAFFS(TRUE);
-#endif
-				chunkWritten =
-				    yaffs_WriteChunkDataToObject(in, chunk,
-								 localBuffer,
-								 nToWriteBack,
-								 0);
-
-				yaffs_ReleaseTempBuffer(dev, localBuffer,
-							__LINE__);
+				chunk_written =
+				    yaffs_wr_data_obj(in, chunk,
+						      local_buffer,
+						      n_writeback, 0);
 
+				yaffs_release_temp_buffer(dev, local_buffer);
 			}
-
 		} else {
+			/* A full chunk. Write directly from the buffer. */
 
-#ifdef CONFIG_YAFFS_WINCE
-			/* Under WinCE can't do direct transfer. Need to use a local buffer.
-			 * This is because we otherwise screw up WinCE's memory mapper
-			 */
-			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
-#ifdef CONFIG_YAFFS_WINCE
-			yfsd_UnlockYAFFS(TRUE);
-#endif
-			memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
-#ifdef CONFIG_YAFFS_WINCE
-			yfsd_LockYAFFS(TRUE);
-#endif
-			chunkWritten =
-			    yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
-							 dev->nDataBytesPerChunk,
-							 0);
-			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
-#else
-			/* A full chunk. Write directly from the supplied buffer. */
-			chunkWritten =
-			    yaffs_WriteChunkDataToObject(in, chunk, buffer,
-							 dev->nDataBytesPerChunk,
-							 0);
-#endif
-			/* Since we've overwritten the cached data, we better invalidate it. */
-			yaffs_InvalidateChunkCache(in, chunk);
-		}
+			chunk_written =
+			    yaffs_wr_data_obj(in, chunk, buffer,
+					      dev->data_bytes_per_chunk, 0);
 
-		if (chunkWritten >= 0) {
-			n -= nToCopy;
-			offset += nToCopy;
-			buffer += nToCopy;
-			nDone += nToCopy;
+			/* Since we've overwritten the cached data,
+			 * we better invalidate it. */
+			yaffs_invalidate_chunk_cache(in, chunk);
 		}
 
+		if (chunk_written >= 0) {
+			n -= n_copy;
+			offset += n_copy;
+			buffer += n_copy;
+			n_done += n_copy;
+		}
 	}
 
 	/* Update file object */
 
-	if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
-		in->variant.fileVariant.fileSize = (startOfWrite + nDone);
-	}
+	if ((start_write + n_done) > in->variant.file_variant.file_size)
+		in->variant.file_variant.file_size = (start_write + n_done);
 
 	in->dirty = 1;
-
-	return nDone;
+	return n_done;
 }
 
+int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+		  int n_bytes, int write_through)
+{
+	yaffs2_handle_hole(in, offset);
+	return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
+}
 
 /* ---------------------- File resizing stuff ------------------ */
 
-static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
+static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
 {
 
-	yaffs_Device *dev = in->myDev;
-	int oldFileSize = in->variant.fileVariant.fileSize;
+	struct yaffs_dev *dev = in->my_dev;
+	loff_t old_size = in->variant.file_variant.file_size;
+	int i;
+	int chunk_id;
+	u32 dummy;
+	int last_del;
+	int start_del;
 
-	int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+	if (old_size > 0)
+		yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
+	else
+		last_del = 0;
 
-	int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
-	    dev->nDataBytesPerChunk;
-	int i;
-	int chunkId;
+	yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
+				&start_del, &dummy);
+	last_del++;
+	start_del++;
 
 	/* Delete backwards so that we don't end up with holes if
 	 * power is lost part-way through the operation.
 	 */
-	for (i = lastDel; i >= startDel; i--) {
+	for (i = last_del; i >= start_del; i--) {
 		/* NB this could be optimised somewhat,
 		 * eg. could retrieve the tags and write them without
-		 * using yaffs_DeleteChunk
+		 * using yaffs_chunk_del
 		 */
 
-		chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
-		if (chunkId > 0) {
-			if (chunkId <
-			    (dev->internalStartBlock * dev->nChunksPerBlock)
-			    || chunkId >=
-			    ((dev->internalEndBlock +
-			      1) * dev->nChunksPerBlock)) {
-				T(YAFFS_TRACE_ALWAYS,
-				  (TSTR("Found daft chunkId %d for %d" TENDSTR),
-				   chunkId, i));
-			} else {
-				in->nDataChunks--;
-				yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
-			}
+		chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
+
+		if (chunk_id < 1)
+			continue;
+
+		if (chunk_id <
+		    (dev->internal_start_block * dev->param.chunks_per_block) ||
+		    chunk_id >=
+		    ((dev->internal_end_block + 1) *
+		      dev->param.chunks_per_block)) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Found daft chunk_id %d for %d",
+				chunk_id, i);
+		} else {
+			in->n_data_chunks--;
+			yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
 		}
 	}
-
 }
 
-int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
 {
+	int new_full;
+	u32 new_partial;
+	struct yaffs_dev *dev = obj->my_dev;
 
-	int oldFileSize = in->variant.fileVariant.fileSize;
-	__u32 newSizeOfPartialChunk = 0;
-	__u32 newFullChunks = 0;
+	yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
 
-	yaffs_Device *dev = in->myDev;
+	yaffs_prune_chunks(obj, new_size);
 
-	yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
+	if (new_partial != 0) {
+		int last_chunk = 1 + new_full;
+		u8 *local_buffer = yaffs_get_temp_buffer(dev);
 
-	yaffs_FlushFilesChunkCache(in);
-	yaffs_InvalidateWholeChunkCache(in);
+		/* Rewrite the last chunk with its new size and zero pad */
+		yaffs_rd_data_obj(obj, last_chunk, local_buffer);
+		memset(local_buffer + new_partial, 0,
+		       dev->data_bytes_per_chunk - new_partial);
 
-	yaffs_CheckGarbageCollection(dev);
+		yaffs_wr_data_obj(obj, last_chunk, local_buffer,
+				  new_partial, 1);
 
-	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
-		return yaffs_GetFileSize(in);
+		yaffs_release_temp_buffer(dev, local_buffer);
 	}
 
-	if (newSize == oldFileSize) {
-		return oldFileSize;
-	}
-
-	if (newSize < oldFileSize) {
-
-		yaffs_PruneResizedChunks(in, newSize);
-
-		if (newSizeOfPartialChunk != 0) {
-			int lastChunk = 1 + newFullChunks;
+	obj->variant.file_variant.file_size = new_size;
 
-			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+	yaffs_prune_tree(dev, &obj->variant.file_variant);
+}
 
-			/* Got to read and rewrite the last chunk with its new size and zero pad */
-			yaffs_ReadChunkDataFromObject(in, lastChunk,
-						      localBuffer);
+int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
+{
+	struct yaffs_dev *dev = in->my_dev;
+	loff_t old_size = in->variant.file_variant.file_size;
 
-			memset(localBuffer + newSizeOfPartialChunk, 0,
-			       dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+	yaffs_flush_file_cache(in);
+	yaffs_invalidate_whole_cache(in);
 
-			yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
-						     newSizeOfPartialChunk, 1);
+	yaffs_check_gc(dev, 0);
 
-			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
-		}
+	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
 
-		in->variant.fileVariant.fileSize = newSize;
+	if (new_size == old_size)
+		return YAFFS_OK;
 
-		yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
+	if (new_size > old_size) {
+		yaffs2_handle_hole(in, new_size);
+		in->variant.file_variant.file_size = new_size;
 	} else {
-		/* newsSize > oldFileSize */
-		in->variant.fileVariant.fileSize = newSize;
+		/* new_size < old_size */
+		yaffs_resize_file_down(in, new_size);
 	}
 
-
-
-	/* Write a new object header.
+	/* Write a new object header to reflect the resize.
 	 * show we've shrunk the file, if need be
-	 * Do this only if the file is not in the deleted directories.
+	 * Do this only if the file is not in the deleted directories
+	 * and is not shadowed.
 	 */
-	if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
-	    in->parent->objectId != YAFFS_OBJECTID_DELETED) {
-		yaffs_UpdateObjectHeader(in, NULL, 0,
-					 (newSize < oldFileSize) ? 1 : 0, 0);
-	}
+	if (in->parent &&
+	    !in->is_shadowed &&
+	    in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+	    in->parent->obj_id != YAFFS_OBJECTID_DELETED)
+		yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
 
 	return YAFFS_OK;
 }
 
-loff_t yaffs_GetFileSize(yaffs_Object * obj)
-{
-	obj = yaffs_GetEquivalentObject(obj);
-
-	switch (obj->variantType) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		return obj->variant.fileVariant.fileSize;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		return yaffs_strlen(obj->variant.symLinkVariant.alias);
-	default:
-		return 0;
-	}
-}
-
-
-
-int yaffs_FlushFile(yaffs_Object * in, int updateTime)
+int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
 {
-	int retVal;
-	if (in->dirty) {
-		yaffs_FlushFilesChunkCache(in);
-		if (updateTime) {
-#ifdef CONFIG_YAFFS_WINCE
-			yfsd_WinFileTimeNow(in->win_mtime);
-#else
+	if (!in->dirty)
+		return YAFFS_OK;
 
-			in->yst_mtime = Y_CURRENT_TIME;
+	yaffs_flush_file_cache(in);
 
-#endif
-		}
-
-		retVal =
-		    (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
-		     0) ? YAFFS_OK : YAFFS_FAIL;
-	} else {
-		retVal = YAFFS_OK;
-	}
+	if (data_sync)
+		return YAFFS_OK;
 
-	return retVal;
+	if (update_time)
+		yaffs_load_current_time(in, 0, 0);
 
+	return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
+				YAFFS_OK : YAFFS_FAIL;
 }
 
-static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
-{
-
-	/* First off, invalidate the file's data in the cache, without flushing. */
-	yaffs_InvalidateWholeChunkCache(in);
 
-	if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
-		/* Move to the unlinked directory so we have a record that it was deleted. */
-		yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
-
-	}
-
-	yaffs_RemoveObjectFromDirectory(in);
-	yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
-	in->chunkId = -1;
-
-	yaffs_FreeObject(in);
-	return YAFFS_OK;
-
-}
-
-/* yaffs_DeleteFile deletes the whole file data
+/* yaffs_del_file deletes the whole file data
  * and the inode associated with the file.
  * It does not delete the links associated with the file.
  */
-static int yaffs_UnlinkFile(yaffs_Object * in)
-{
-
-	int retVal;
-	int immediateDeletion = 0;
-
-	if (1) {
-/* XXX U-BOOT XXX */
-#if 0
-#ifdef __KERNEL__
-		if (!in->myInode) {
-			immediateDeletion = 1;
-
-		}
-#endif
-#else
-		if (in->inUse <= 0) {
-			immediateDeletion = 1;
-
-		}
-#endif
-		if (immediateDeletion) {
-			retVal =
-			    yaffs_ChangeObjectName(in, in->myDev->deletedDir,
-						   "deleted", 0, 0);
-			T(YAFFS_TRACE_TRACING,
-			  (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
-			   in->objectId));
-			in->deleted = 1;
-			in->myDev->nDeletedFiles++;
-			if (0 && in->myDev->isYaffs2) {
-				yaffs_ResizeFile(in, 0);
-			}
-			yaffs_SoftDeleteFile(in);
-		} else {
-			retVal =
-			    yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
-						   "unlinked", 0, 0);
-		}
-
+static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
+{
+	int ret_val;
+	int del_now = 0;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (!in->my_inode)
+		del_now = 1;
+
+	if (del_now) {
+		ret_val =
+		    yaffs_change_obj_name(in, in->my_dev->del_dir,
+					  _Y("deleted"), 0, 0);
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"yaffs: immediate deletion of file %d",
+			in->obj_id);
+		in->deleted = 1;
+		in->my_dev->n_deleted_files++;
+		if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+			yaffs_resize_file(in, 0);
+		yaffs_soft_del_file(in);
+	} else {
+		ret_val =
+		    yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
+					  _Y("unlinked"), 0, 0);
 	}
-	return retVal;
+	return ret_val;
 }
 
-int yaffs_DeleteFile(yaffs_Object * in)
+int yaffs_del_file(struct yaffs_obj *in)
 {
-	int retVal = YAFFS_OK;
+	int ret_val = YAFFS_OK;
+	int deleted;	/* Need to cache value on stack if in is freed */
+	struct yaffs_dev *dev = in->my_dev;
 
-	if (in->nDataChunks > 0) {
-		/* Use soft deletion if there is data in the file */
-		if (!in->unlinked) {
-			retVal = yaffs_UnlinkFile(in);
-		}
-		if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
+	if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+		yaffs_resize_file(in, 0);
+
+	if (in->n_data_chunks > 0) {
+		/* Use soft deletion if there is data in the file.
+		 * That won't be the case if it has been resized to zero.
+		 */
+		if (!in->unlinked)
+			ret_val = yaffs_unlink_file_if_needed(in);
+
+		deleted = in->deleted;
+
+		if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
 			in->deleted = 1;
-			in->myDev->nDeletedFiles++;
-			yaffs_SoftDeleteFile(in);
+			deleted = 1;
+			in->my_dev->n_deleted_files++;
+			yaffs_soft_del_file(in);
 		}
-		return in->deleted ? YAFFS_OK : YAFFS_FAIL;
+		return deleted ? YAFFS_OK : YAFFS_FAIL;
 	} else {
 		/* The file has no data chunks so we toss it immediately */
-		yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
-		in->variant.fileVariant.top = NULL;
-		yaffs_DoGenericObjectDeletion(in);
+		yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
+		in->variant.file_variant.top = NULL;
+		yaffs_generic_obj_del(in);
 
 		return YAFFS_OK;
 	}
 }
 
-static int yaffs_DeleteDirectory(yaffs_Object * in)
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
 {
-	/* First check that the directory is empty. */
-	if (list_empty(&in->variant.directoryVariant.children)) {
-		return yaffs_DoGenericObjectDeletion(in);
-	}
+	return (obj &&
+		obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+		!(list_empty(&obj->variant.dir_variant.children));
+}
 
-	return YAFFS_FAIL;
+static int yaffs_del_dir(struct yaffs_obj *obj)
+{
+	/* First check that the directory is empty. */
+	if (yaffs_is_non_empty_dir(obj))
+		return YAFFS_FAIL;
 
+	return yaffs_generic_obj_del(obj);
 }
 
-static int yaffs_DeleteSymLink(yaffs_Object * in)
+static int yaffs_del_symlink(struct yaffs_obj *in)
 {
-	YFREE(in->variant.symLinkVariant.alias);
+	kfree(in->variant.symlink_variant.alias);
+	in->variant.symlink_variant.alias = NULL;
 
-	return yaffs_DoGenericObjectDeletion(in);
+	return yaffs_generic_obj_del(in);
 }
 
-static int yaffs_DeleteHardLink(yaffs_Object * in)
+static int yaffs_del_link(struct yaffs_obj *in)
 {
-	/* remove this hardlink from the list assocaited with the equivalent
+	/* remove this hardlink from the list associated with the equivalent
 	 * object
 	 */
-	list_del(&in->hardLinks);
-	return yaffs_DoGenericObjectDeletion(in);
+	list_del_init(&in->hard_links);
+	return yaffs_generic_obj_del(in);
 }
 
-static void yaffs_DestroyObject(yaffs_Object * obj)
+int yaffs_del_obj(struct yaffs_obj *obj)
 {
-	switch (obj->variantType) {
+	int ret_val = -1;
+
+	switch (obj->variant_type) {
 	case YAFFS_OBJECT_TYPE_FILE:
-		yaffs_DeleteFile(obj);
+		ret_val = yaffs_del_file(obj);
 		break;
 	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		yaffs_DeleteDirectory(obj);
+		if (!list_empty(&obj->variant.dir_variant.dirty)) {
+			yaffs_trace(YAFFS_TRACE_BACKGROUND,
+				"Remove object %d from dirty directories",
+				obj->obj_id);
+			list_del_init(&obj->variant.dir_variant.dirty);
+		}
+		return yaffs_del_dir(obj);
 		break;
 	case YAFFS_OBJECT_TYPE_SYMLINK:
-		yaffs_DeleteSymLink(obj);
+		ret_val = yaffs_del_symlink(obj);
 		break;
 	case YAFFS_OBJECT_TYPE_HARDLINK:
-		yaffs_DeleteHardLink(obj);
+		ret_val = yaffs_del_link(obj);
 		break;
 	case YAFFS_OBJECT_TYPE_SPECIAL:
-		yaffs_DoGenericObjectDeletion(obj);
+		ret_val = yaffs_generic_obj_del(obj);
 		break;
 	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		ret_val = 0;
 		break;		/* should not happen. */
 	}
+	return ret_val;
 }
 
-static int yaffs_UnlinkWorker(yaffs_Object * obj)
+static int yaffs_unlink_worker(struct yaffs_obj *obj)
 {
+	int del_now = 0;
+
+	if (!obj)
+		return YAFFS_FAIL;
 
-	if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-		return yaffs_DeleteHardLink(obj);
-	} else if (!list_empty(&obj->hardLinks)) {
+	if (!obj->my_inode)
+		del_now = 1;
+
+	yaffs_update_parent(obj->parent);
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+		return yaffs_del_link(obj);
+	} else if (!list_empty(&obj->hard_links)) {
 		/* Curve ball: We're unlinking an object that has a hardlink.
 		 *
 		 * This problem arises because we are not strictly following
@@ -5072,1638 +3985,532 @@ static int yaffs_UnlinkWorker(yaffs_Object * obj)
 		 * Instead, we do the following:
 		 * - Select a hardlink.
 		 * - Unhook it from the hard links
-		 * - Unhook it from its parent directory (so that the rename can work)
+		 * - Move it from its parent directory so that the rename works.
 		 * - Rename the object to the hardlink's name.
 		 * - Delete the hardlink
 		 */
 
-		yaffs_Object *hl;
-		int retVal;
+		struct yaffs_obj *hl;
+		struct yaffs_obj *parent;
+		int ret_val;
 		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
 
-		hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
+		hl = list_entry(obj->hard_links.next, struct yaffs_obj,
+				hard_links);
 
-		list_del_init(&hl->hardLinks);
-		list_del_init(&hl->siblings);
+		yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+		parent = hl->parent;
 
-		yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+		list_del_init(&hl->hard_links);
 
-		retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
+		yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
 
-		if (retVal == YAFFS_OK) {
-			retVal = yaffs_DoGenericObjectDeletion(hl);
-		}
-		return retVal;
+		ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
 
-	} else {
-		switch (obj->variantType) {
+		if (ret_val == YAFFS_OK)
+			ret_val = yaffs_generic_obj_del(hl);
+
+		return ret_val;
+
+	} else if (del_now) {
+		switch (obj->variant_type) {
 		case YAFFS_OBJECT_TYPE_FILE:
-			return yaffs_UnlinkFile(obj);
+			return yaffs_del_file(obj);
 			break;
 		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			return yaffs_DeleteDirectory(obj);
+			list_del_init(&obj->variant.dir_variant.dirty);
+			return yaffs_del_dir(obj);
 			break;
 		case YAFFS_OBJECT_TYPE_SYMLINK:
-			return yaffs_DeleteSymLink(obj);
+			return yaffs_del_symlink(obj);
 			break;
 		case YAFFS_OBJECT_TYPE_SPECIAL:
-			return yaffs_DoGenericObjectDeletion(obj);
+			return yaffs_generic_obj_del(obj);
 			break;
 		case YAFFS_OBJECT_TYPE_HARDLINK:
 		case YAFFS_OBJECT_TYPE_UNKNOWN:
 		default:
 			return YAFFS_FAIL;
 		}
+	} else if (yaffs_is_non_empty_dir(obj)) {
+		return YAFFS_FAIL;
+	} else {
+		return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
+						_Y("unlinked"), 0, 0);
 	}
 }
 
-
-static int yaffs_UnlinkObject( yaffs_Object *obj)
+static int yaffs_unlink_obj(struct yaffs_obj *obj)
 {
-
-	if (obj && obj->unlinkAllowed) {
-		return yaffs_UnlinkWorker(obj);
-	}
+	if (obj && obj->unlink_allowed)
+		return yaffs_unlink_worker(obj);
 
 	return YAFFS_FAIL;
+}
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
+{
+	struct yaffs_obj *obj;
 
+	obj = yaffs_find_by_name(dir, name);
+	return yaffs_unlink_obj(obj);
 }
-int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
+
+/* Note:
+ * If old_name is NULL then we take old_dir as the object to be renamed.
+ */
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
+		     struct yaffs_obj *new_dir, const YCHAR *new_name)
 {
-	yaffs_Object *obj;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *existing_target = NULL;
+	int force = 0;
+	int result;
+	struct yaffs_dev *dev;
+
+	if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+	if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	dev = old_dir->my_dev;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+	/* Special case for case insemsitive systems.
+	 * While look-up is case insensitive, the name isn't.
+	 * Therefore we might want to change x.txt to X.txt
+	 */
+	if (old_dir == new_dir &&
+		old_name && new_name &&
+		yaffs_strcmp(old_name, new_name) == 0)
+		force = 1;
+#endif
+
+	if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
+	    YAFFS_MAX_NAME_LENGTH)
+		/* ENAMETOOLONG */
+		return YAFFS_FAIL;
+
+	if (old_name)
+		obj = yaffs_find_by_name(old_dir, old_name);
+	else{
+		obj = old_dir;
+		old_dir = obj->parent;
+	}
+
+	if (obj && obj->rename_allowed) {
+		/* Now handle an existing target, if there is one */
+		existing_target = yaffs_find_by_name(new_dir, new_name);
+		if (yaffs_is_non_empty_dir(existing_target)) {
+			return YAFFS_FAIL;	/* ENOTEMPTY */
+		} else if (existing_target && existing_target != obj) {
+			/* Nuke the target first, using shadowing,
+			 * but only if it isn't the same object.
+			 *
+			 * Note we must disable gc here otherwise it can mess
+			 * up the shadowing.
+			 *
+			 */
+			dev->gc_disable = 1;
+			yaffs_change_obj_name(obj, new_dir, new_name, force,
+					      existing_target->obj_id);
+			existing_target->is_shadowed = 1;
+			yaffs_unlink_obj(existing_target);
+			dev->gc_disable = 0;
+		}
+
+		result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
+
+		yaffs_update_parent(old_dir);
+		if (new_dir != old_dir)
+			yaffs_update_parent(new_dir);
 
-	obj = yaffs_FindObjectByName(dir, name);
-	return yaffs_UnlinkObject(obj);
+		return result;
+	}
+	return YAFFS_FAIL;
 }
 
 /*----------------------- Initialisation Scanning ---------------------- */
 
-static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
-				       int backwardScanning)
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+			       int backward_scanning)
 {
-	yaffs_Object *obj;
+	struct yaffs_obj *obj;
 
-	if (!backwardScanning) {
-		/* Handle YAFFS1 forward scanning case
-		 * For YAFFS1 we always do the deletion
-		 */
-
-	} else {
+	if (backward_scanning) {
 		/* Handle YAFFS2 case (backward scanning)
 		 * If the shadowed object exists then ignore.
 		 */
-		if (yaffs_FindObjectByNumber(dev, objId)) {
+		obj = yaffs_find_by_number(dev, obj_id);
+		if (obj)
 			return;
-		}
 	}
 
-	/* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+	/* Let's create it (if it does not exist) assuming it is a file so that
+	 * it can do shrinking etc.
 	 * We put it in unlinked dir to be cleaned up after the scanning
 	 */
 	obj =
-	    yaffs_FindOrCreateObjectByNumber(dev, objId,
-					     YAFFS_OBJECT_TYPE_FILE);
-	yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
-	obj->variant.fileVariant.shrinkSize = 0;
-	obj->valid = 1;		/* So that we don't read any other info for this file */
-
+	    yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
+	if (!obj)
+		return;
+	obj->is_shadowed = 1;
+	yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
+	obj->variant.file_variant.shrink_size = 0;
+	obj->valid = 1;		/* So that we don't read any other info. */
 }
 
-typedef struct {
-	int seq;
-	int block;
-} yaffs_BlockIndex;
-
-
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
 {
-	yaffs_Object *hl;
-	yaffs_Object *in;
-
-	while (hardList) {
-		hl = hardList;
-		hardList = (yaffs_Object *) (hardList->hardLinks.next);
+	struct list_head *lh;
+	struct list_head *save;
+	struct yaffs_obj *hl;
+	struct yaffs_obj *in;
 
-		in = yaffs_FindObjectByNumber(dev,
-					      hl->variant.hardLinkVariant.
-					      equivalentObjectId);
+	list_for_each_safe(lh, save, hard_list) {
+		hl = list_entry(lh, struct yaffs_obj, hard_links);
+		in = yaffs_find_by_number(dev,
+					hl->variant.hardlink_variant.equiv_id);
 
 		if (in) {
 			/* Add the hardlink pointers */
-			hl->variant.hardLinkVariant.equivalentObject = in;
-			list_add(&hl->hardLinks, &in->hardLinks);
+			hl->variant.hardlink_variant.equiv_obj = in;
+			list_add(&hl->hard_links, &in->hard_links);
 		} else {
 			/* Todo Need to report/handle this better.
 			 * Got a problem... hardlink to a non-existant object
 			 */
-			hl->variant.hardLinkVariant.equivalentObject = NULL;
-			INIT_LIST_HEAD(&hl->hardLinks);
-
+			hl->variant.hardlink_variant.equiv_obj = NULL;
+			INIT_LIST_HEAD(&hl->hard_links);
 		}
-
 	}
-
 }
 
-
-
-
-
-static int ybicmp(const void *a, const void *b){
-    register int aseq = ((yaffs_BlockIndex *)a)->seq;
-    register int bseq = ((yaffs_BlockIndex *)b)->seq;
-    register int ablock = ((yaffs_BlockIndex *)a)->block;
-    register int bblock = ((yaffs_BlockIndex *)b)->block;
-    if( aseq == bseq )
-	return ablock - bblock;
-    else
-	return aseq - bseq;
-
-}
-
-static int yaffs_Scan(yaffs_Device * dev)
+static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
 {
-	yaffs_ExtendedTags tags;
-	int blk;
-	int blockIterator;
-	int startIterator;
-	int endIterator;
-	int nBlocksToScan = 0;
-
-	int chunk;
-	int c;
-	int deleted;
-	yaffs_BlockState state;
-	yaffs_Object *hardList = NULL;
-	yaffs_BlockInfo *bi;
-	int sequenceNumber;
-	yaffs_ObjectHeader *oh;
-	yaffs_Object *in;
-	yaffs_Object *parent;
-	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
-	int alloc_failed = 0;
-
-
-	__u8 *chunkData;
-
-	yaffs_BlockIndex *blockIndex = NULL;
-
-	if (dev->isYaffs2) {
-		T(YAFFS_TRACE_SCAN,
-		  (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	//TODO  Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
-
-	T(YAFFS_TRACE_SCAN,
-	  (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
-	   dev->internalStartBlock, dev->internalEndBlock));
-
-	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
-	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
-	if (dev->isYaffs2) {
-		blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
-		if(!blockIndex)
-			return YAFFS_FAIL;
-	}
-
-	/* Scan all the blocks to determine their state */
-	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
-		bi = yaffs_GetBlockInfo(dev, blk);
-		yaffs_ClearChunkBits(dev, blk);
-		bi->pagesInUse = 0;
-		bi->softDeletions = 0;
-
-		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
-
-		bi->blockState = state;
-		bi->sequenceNumber = sequenceNumber;
-
-		T(YAFFS_TRACE_SCAN_DEBUG,
-		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
-		   state, sequenceNumber));
-
-		if (state == YAFFS_BLOCK_STATE_DEAD) {
-			T(YAFFS_TRACE_BAD_BLOCKS,
-			  (TSTR("block %d is bad" TENDSTR), blk));
-		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
-			T(YAFFS_TRACE_SCAN_DEBUG,
-			  (TSTR("Block empty " TENDSTR)));
-			dev->nErasedBlocks++;
-			dev->nFreeChunks += dev->nChunksPerBlock;
-		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-
-			/* Determine the highest sequence number */
-			if (dev->isYaffs2 &&
-			    sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
-			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
-
-				blockIndex[nBlocksToScan].seq = sequenceNumber;
-				blockIndex[nBlocksToScan].block = blk;
-
-				nBlocksToScan++;
-
-				if (sequenceNumber >= dev->sequenceNumber) {
-					dev->sequenceNumber = sequenceNumber;
-				}
-			} else if (dev->isYaffs2) {
-				/* TODO: Nasty sequence number! */
-				T(YAFFS_TRACE_SCAN,
-				  (TSTR
-				   ("Block scanning block %d has bad sequence number %d"
-				    TENDSTR), blk, sequenceNumber));
-
-			}
-		}
-	}
-
-	/* Sort the blocks
-	 * Dungy old bubble sort for now...
-	 */
-	if (dev->isYaffs2) {
-		yaffs_BlockIndex temp;
-		int i;
-		int j;
-
-		for (i = 0; i < nBlocksToScan; i++)
-			for (j = i + 1; j < nBlocksToScan; j++)
-				if (blockIndex[i].seq > blockIndex[j].seq) {
-					temp = blockIndex[j];
-					blockIndex[j] = blockIndex[i];
-					blockIndex[i] = temp;
-				}
-	}
-
-	/* Now scan the blocks looking at the data. */
-	if (dev->isYaffs2) {
-		startIterator = 0;
-		endIterator = nBlocksToScan - 1;
-		T(YAFFS_TRACE_SCAN_DEBUG,
-		  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
-	} else {
-		startIterator = dev->internalStartBlock;
-		endIterator = dev->internalEndBlock;
-	}
-
-	/* For each block.... */
-	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
-	     blockIterator++) {
-
-		if (dev->isYaffs2) {
-			/* get the block to scan in the correct order */
-			blk = blockIndex[blockIterator].block;
-		} else {
-			blk = blockIterator;
-		}
-
-		bi = yaffs_GetBlockInfo(dev, blk);
-		state = bi->blockState;
-
-		deleted = 0;
-
-		/* For each chunk in each block that needs scanning....*/
-		for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
-		     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
-			/* Read the tags and decide what to do */
-			chunk = blk * dev->nChunksPerBlock + c;
-
-			yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
-							&tags);
-
-			/* Let's have a good look at this chunk... */
-
-			if (!dev->isYaffs2 && tags.chunkDeleted) {
-				/* YAFFS1 only...
-				 * A deleted chunk
-				 */
-				deleted++;
-				dev->nFreeChunks++;
-				/*T((" %d %d deleted\n",blk,c)); */
-			} else if (!tags.chunkUsed) {
-				/* An unassigned chunk in the block
-				 * This means that either the block is empty or
-				 * this is the one being allocated from
-				 */
-
-				if (c == 0) {
-					/* We're looking at the first chunk in the block so the block is unused */
-					state = YAFFS_BLOCK_STATE_EMPTY;
-					dev->nErasedBlocks++;
-				} else {
-					/* this is the block being allocated from */
-					T(YAFFS_TRACE_SCAN,
-					  (TSTR
-					   (" Allocating from %d %d" TENDSTR),
-					   blk, c));
-					state = YAFFS_BLOCK_STATE_ALLOCATING;
-					dev->allocationBlock = blk;
-					dev->allocationPage = c;
-					dev->allocationBlockFinder = blk;
-					/* Set it to here to encourage the allocator to go forth from here. */
-
-					/* Yaffs2 sanity check:
-					 * This should be the one with the highest sequence number
-					 */
-					if (dev->isYaffs2
-					    && (dev->sequenceNumber !=
-						bi->sequenceNumber)) {
-						T(YAFFS_TRACE_ALWAYS,
-						  (TSTR
-						   ("yaffs: Allocation block %d was not highest sequence id:"
-						    " block seq = %d, dev seq = %d"
-						    TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
-					}
-				}
-
-				dev->nFreeChunks += (dev->nChunksPerBlock - c);
-			} else if (tags.chunkId > 0) {
-				/* chunkId > 0 so it is a data chunk... */
-				unsigned int endpos;
-
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
-
-				in = yaffs_FindOrCreateObjectByNumber(dev,
-								      tags.
-								      objectId,
-								      YAFFS_OBJECT_TYPE_FILE);
-				/* PutChunkIntoFile checks for a clash (two data chunks with
-				 * the same chunkId).
-				 */
-
-				if(!in)
-					alloc_failed = 1;
-
-				if(in){
-					if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
-						alloc_failed = 1;
-				}
-
-				endpos =
-				    (tags.chunkId - 1) * dev->nDataBytesPerChunk +
-				    tags.byteCount;
-				if (in &&
-				    in->variantType == YAFFS_OBJECT_TYPE_FILE
-				    && in->variant.fileVariant.scannedFileSize <
-				    endpos) {
-					in->variant.fileVariant.
-					    scannedFileSize = endpos;
-					if (!dev->useHeaderFileSize) {
-						in->variant.fileVariant.
-						    fileSize =
-						    in->variant.fileVariant.
-						    scannedFileSize;
-					}
-
-				}
-				/* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
-			} else {
-				/* chunkId == 0, so it is an ObjectHeader.
-				 * Thus, we read in the object header and make the object
-				 */
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
-
-				yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
-								chunkData,
-								NULL);
-
-				oh = (yaffs_ObjectHeader *) chunkData;
-
-				in = yaffs_FindObjectByNumber(dev,
-							      tags.objectId);
-				if (in && in->variantType != oh->type) {
-					/* This should not happen, but somehow
-					 * Wev'e ended up with an objectId that has been reused but not yet
-					 * deleted, and worse still it has changed type. Delete the old object.
-					 */
-
-					yaffs_DestroyObject(in);
-
-					in = 0;
-				}
-
-				in = yaffs_FindOrCreateObjectByNumber(dev,
-								      tags.
-								      objectId,
-								      oh->type);
-
-				if(!in)
-					alloc_failed = 1;
-
-				if (in && oh->shadowsObject > 0) {
-					yaffs_HandleShadowedObject(dev,
-								   oh->
-								   shadowsObject,
-								   0);
-				}
-
-				if (in && in->valid) {
-					/* We have already filled this one. We have a duplicate and need to resolve it. */
-
-					unsigned existingSerial = in->serial;
-					unsigned newSerial = tags.serialNumber;
-
-					if (dev->isYaffs2 ||
-					    ((existingSerial + 1) & 3) ==
-					    newSerial) {
-						/* Use new one - destroy the exisiting one */
-						yaffs_DeleteChunk(dev,
-								  in->chunkId,
-								  1, __LINE__);
-						in->valid = 0;
-					} else {
-						/* Use existing - destroy this one. */
-						yaffs_DeleteChunk(dev, chunk, 1,
-								  __LINE__);
-					}
-				}
-
-				if (in && !in->valid &&
-				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
-				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
-					/* We only load some info, don't fiddle with directory structure */
-					in->valid = 1;
-					in->variantType = oh->type;
-
-					in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-					in->win_atime[0] = oh->win_atime[0];
-					in->win_ctime[0] = oh->win_ctime[0];
-					in->win_mtime[0] = oh->win_mtime[0];
-					in->win_atime[1] = oh->win_atime[1];
-					in->win_ctime[1] = oh->win_ctime[1];
-					in->win_mtime[1] = oh->win_mtime[1];
-#else
-					in->yst_uid = oh->yst_uid;
-					in->yst_gid = oh->yst_gid;
-					in->yst_atime = oh->yst_atime;
-					in->yst_mtime = oh->yst_mtime;
-					in->yst_ctime = oh->yst_ctime;
-					in->yst_rdev = oh->yst_rdev;
-#endif
-					in->chunkId = chunk;
-
-				} else if (in && !in->valid) {
-					/* we need to load this info */
-
-					in->valid = 1;
-					in->variantType = oh->type;
-
-					in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-					in->win_atime[0] = oh->win_atime[0];
-					in->win_ctime[0] = oh->win_ctime[0];
-					in->win_mtime[0] = oh->win_mtime[0];
-					in->win_atime[1] = oh->win_atime[1];
-					in->win_ctime[1] = oh->win_ctime[1];
-					in->win_mtime[1] = oh->win_mtime[1];
-#else
-					in->yst_uid = oh->yst_uid;
-					in->yst_gid = oh->yst_gid;
-					in->yst_atime = oh->yst_atime;
-					in->yst_mtime = oh->yst_mtime;
-					in->yst_ctime = oh->yst_ctime;
-					in->yst_rdev = oh->yst_rdev;
-#endif
-					in->chunkId = chunk;
-
-					yaffs_SetObjectName(in, oh->name);
-					in->dirty = 0;
-
-					/* directory stuff...
-					 * hook up to parent
-					 */
-
-					parent =
-					    yaffs_FindOrCreateObjectByNumber
-					    (dev, oh->parentObjectId,
-					     YAFFS_OBJECT_TYPE_DIRECTORY);
-					if (parent->variantType ==
-					    YAFFS_OBJECT_TYPE_UNKNOWN) {
-						/* Set up as a directory */
-						parent->variantType =
-						    YAFFS_OBJECT_TYPE_DIRECTORY;
-						INIT_LIST_HEAD(&parent->variant.
-							       directoryVariant.
-							       children);
-					} else if (parent->variantType !=
-						   YAFFS_OBJECT_TYPE_DIRECTORY)
-					{
-						/* Hoosterman, another problem....
-						 * We're trying to use a non-directory as a directory
-						 */
-
-						T(YAFFS_TRACE_ERROR,
-						  (TSTR
-						   ("yaffs tragedy: attempting to use non-directory as"
-						    " a directory in scan. Put in lost+found."
-						    TENDSTR)));
-						parent = dev->lostNFoundDir;
-					}
-
-					yaffs_AddObjectToDirectory(parent, in);
-
-					if (0 && (parent == dev->deletedDir ||
-						  parent == dev->unlinkedDir)) {
-						in->deleted = 1;	/* If it is unlinked at start up then it wants deleting */
-						dev->nDeletedFiles++;
-					}
-					/* Note re hardlinks.
-					 * Since we might scan a hardlink before its equivalent object is scanned
-					 * we put them all in a list.
-					 * After scanning is complete, we should have all the objects, so we run through this
-					 * list and fix up all the chains.
-					 */
-
-					switch (in->variantType) {
-					case YAFFS_OBJECT_TYPE_UNKNOWN:
-						/* Todo got a problem */
-						break;
-					case YAFFS_OBJECT_TYPE_FILE:
-						if (dev->isYaffs2
-						    && oh->isShrink) {
-							/* Prune back the shrunken chunks */
-							yaffs_PruneResizedChunks
-							    (in, oh->fileSize);
-							/* Mark the block as having a shrinkHeader */
-							bi->hasShrinkHeader = 1;
-						}
-
-						if (dev->useHeaderFileSize)
-
-							in->variant.fileVariant.
-							    fileSize =
-							    oh->fileSize;
-
-						break;
-					case YAFFS_OBJECT_TYPE_HARDLINK:
-						in->variant.hardLinkVariant.
-						    equivalentObjectId =
-						    oh->equivalentObjectId;
-						in->hardLinks.next =
-						    (struct list_head *)
-						    hardList;
-						hardList = in;
-						break;
-					case YAFFS_OBJECT_TYPE_DIRECTORY:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SPECIAL:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SYMLINK:
-						in->variant.symLinkVariant.alias =
-						    yaffs_CloneString(oh->alias);
-						if(!in->variant.symLinkVariant.alias)
-							alloc_failed = 1;
-						break;
-					}
-
-					if (parent == dev->deletedDir) {
-						yaffs_DestroyObject(in);
-						bi->hasShrinkHeader = 1;
-					}
-				}
-			}
-		}
-
-		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-			/* If we got this far while scanning, then the block is fully allocated.*/
-			state = YAFFS_BLOCK_STATE_FULL;
-		}
-
-		bi->blockState = state;
-
-		/* Now let's see if it was dirty */
-		if (bi->pagesInUse == 0 &&
-		    !bi->hasShrinkHeader &&
-		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
-			yaffs_BlockBecameDirty(dev, blk);
-		}
-
-	}
-
-	if (blockIndex) {
-		YFREE(blockIndex);
-	}
-
-
-	/* Ok, we've done all the scanning.
-	 * Fix up the hard link chains.
-	 * We should now have scanned all the objects, now it's time to add these
-	 * hardlinks.
+	/*
+	 *  Sort out state of unlinked and deleted objects after scanning.
 	 */
+	struct list_head *i;
+	struct list_head *n;
+	struct yaffs_obj *l;
 
-	yaffs_HardlinkFixup(dev,hardList);
+	if (dev->read_only)
+		return;
 
-	/* Handle the unlinked files. Since they were left in an unlinked state we should
-	 * just delete them.
-	 */
-	{
-		struct list_head *i;
-		struct list_head *n;
-
-		yaffs_Object *l;
-		/* Soft delete all the unlinked files */
-		list_for_each_safe(i, n,
-				   &dev->unlinkedDir->variant.directoryVariant.
-				   children) {
-			if (i) {
-				l = list_entry(i, yaffs_Object, siblings);
-				yaffs_DestroyObject(l);
-			}
-		}
+	/* Soft delete all the unlinked files */
+	list_for_each_safe(i, n,
+			   &dev->unlinked_dir->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+		yaffs_del_obj(l);
 	}
 
-	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
-
-	if(alloc_failed){
-		return YAFFS_FAIL;
+	list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+		yaffs_del_obj(l);
 	}
-
-	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
-
-
-	return YAFFS_OK;
 }
 
-static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
-{
-	__u8 *chunkData;
-	yaffs_ObjectHeader *oh;
-	yaffs_Device *dev = in->myDev;
-	yaffs_ExtendedTags tags;
-
-	if(!in)
-		return;
-
-#if 0
-	T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
-		in->objectId,
-		in->lazyLoaded ? "not yet" : "already"));
-#endif
-
-	if(in->lazyLoaded){
-		in->lazyLoaded = 0;
-		chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
-		yaffs_ReadChunkWithTagsFromNAND(dev, in->chunkId,
-						chunkData, &tags);
-		oh = (yaffs_ObjectHeader *) chunkData;
-
-		in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-		in->win_atime[0] = oh->win_atime[0];
-		in->win_ctime[0] = oh->win_ctime[0];
-		in->win_mtime[0] = oh->win_mtime[0];
-		in->win_atime[1] = oh->win_atime[1];
-		in->win_ctime[1] = oh->win_ctime[1];
-		in->win_mtime[1] = oh->win_mtime[1];
-#else
-		in->yst_uid = oh->yst_uid;
-		in->yst_gid = oh->yst_gid;
-		in->yst_atime = oh->yst_atime;
-		in->yst_mtime = oh->yst_mtime;
-		in->yst_ctime = oh->yst_ctime;
-		in->yst_rdev = oh->yst_rdev;
-
-#endif
-		yaffs_SetObjectName(in, oh->name);
-
-		if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
-			 in->variant.symLinkVariant.alias =
-						    yaffs_CloneString(oh->alias);
-		}
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ *  This code assumes that we don't ever change the current relationships
+ *  between directories:
+ *   root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
+ *   lost-n-found->parent == root_dir
+ *
+ * This fixes the problem where directories might have inadvertently been
+ * deleted leaving the object "hanging" without being rooted in the
+ * directory tree.
+ */
 
-		yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
-	}
+static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+	return (obj == dev->del_dir ||
+		obj == dev->unlinked_dir || obj == dev->root_dir);
 }
 
-static int yaffs_ScanBackwards(yaffs_Device * dev)
+static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
 {
-	yaffs_ExtendedTags tags;
-	int blk;
-	int blockIterator;
-	int startIterator;
-	int endIterator;
-	int nBlocksToScan = 0;
-
-	int chunk;
-	int c;
-	yaffs_BlockState state;
-	yaffs_Object *hardList = NULL;
-	yaffs_BlockInfo *bi;
-	int sequenceNumber;
-	yaffs_ObjectHeader *oh;
-	yaffs_Object *in;
-	yaffs_Object *parent;
-	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-	int itsUnlinked;
-	__u8 *chunkData;
-
-	int fileSize;
-	int isShrink;
-	int foundChunksInBlock;
-	int equivalentObjectId;
-	int alloc_failed = 0;
-
-
-	yaffs_BlockIndex *blockIndex = NULL;
-	int altBlockIndex = 0;
-
-	if (!dev->isYaffs2) {
-		T(YAFFS_TRACE_SCAN,
-		  (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	T(YAFFS_TRACE_SCAN,
-	  (TSTR
-	   ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
-	    TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
-
-
-	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
-	blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
-
-	if(!blockIndex) {
-		blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
-		altBlockIndex = 1;
-	}
-
-	if(!blockIndex) {
-		T(YAFFS_TRACE_SCAN,
-		  (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	dev->blocksInCheckpoint = 0;
-
-	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
-	/* Scan all the blocks to determine their state */
-	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
-		bi = yaffs_GetBlockInfo(dev, blk);
-		yaffs_ClearChunkBits(dev, blk);
-		bi->pagesInUse = 0;
-		bi->softDeletions = 0;
-
-		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
-
-		bi->blockState = state;
-		bi->sequenceNumber = sequenceNumber;
-
-		if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
-			bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
-
-		T(YAFFS_TRACE_SCAN_DEBUG,
-		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
-		   state, sequenceNumber));
-
-
-		if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
-			dev->blocksInCheckpoint++;
-
-		} else if (state == YAFFS_BLOCK_STATE_DEAD) {
-			T(YAFFS_TRACE_BAD_BLOCKS,
-			  (TSTR("block %d is bad" TENDSTR), blk));
-		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
-			T(YAFFS_TRACE_SCAN_DEBUG,
-			  (TSTR("Block empty " TENDSTR)));
-			dev->nErasedBlocks++;
-			dev->nFreeChunks += dev->nChunksPerBlock;
-		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-
-			/* Determine the highest sequence number */
-			if (dev->isYaffs2 &&
-			    sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
-			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
-
-				blockIndex[nBlocksToScan].seq = sequenceNumber;
-				blockIndex[nBlocksToScan].block = blk;
-
-				nBlocksToScan++;
-
-				if (sequenceNumber >= dev->sequenceNumber) {
-					dev->sequenceNumber = sequenceNumber;
-				}
-			} else if (dev->isYaffs2) {
-				/* TODO: Nasty sequence number! */
-				T(YAFFS_TRACE_SCAN,
-				  (TSTR
-				   ("Block scanning block %d has bad sequence number %d"
-				    TENDSTR), blk, sequenceNumber));
-
-			}
-		}
-	}
-
-	T(YAFFS_TRACE_SCAN,
-	(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
-
-
-
-	YYIELD();
-
-	/* Sort the blocks */
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-	{
-		/* Use qsort now. */
-		yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
-	}
-#else
-	{
-		/* Dungy old bubble sort... */
-
-		yaffs_BlockIndex temp;
-		int i;
-		int j;
-
-		for (i = 0; i < nBlocksToScan; i++)
-			for (j = i + 1; j < nBlocksToScan; j++)
-				if (blockIndex[i].seq > blockIndex[j].seq) {
-					temp = blockIndex[j];
-					blockIndex[j] = blockIndex[i];
-					blockIndex[i] = temp;
-				}
-	}
-#endif
-
-	YYIELD();
-
-	T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
-
-	/* Now scan the blocks looking at the data. */
-	startIterator = 0;
-	endIterator = nBlocksToScan - 1;
-	T(YAFFS_TRACE_SCAN_DEBUG,
-	  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
-
-	/* For each block.... backwards */
-	for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
-	     blockIterator--) {
-		/* Cooperative multitasking! This loop can run for so
-		   long that watchdog timers expire. */
-		YYIELD();
-
-		/* get the block to scan in the correct order */
-		blk = blockIndex[blockIterator].block;
-
-		bi = yaffs_GetBlockInfo(dev, blk);
-
-
-		state = bi->blockState;
-
-		/* For each chunk in each block that needs scanning.... */
-		foundChunksInBlock = 0;
-		for (c = dev->nChunksPerBlock - 1;
-		     !alloc_failed && c >= 0 &&
-		     (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-		      state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
-			/* Scan backwards...
-			 * Read the tags and decide what to do
-			 */
-
-			chunk = blk * dev->nChunksPerBlock + c;
-
-			yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
-							&tags);
-
-			/* Let's have a good look at this chunk... */
-
-			if (!tags.chunkUsed) {
-				/* An unassigned chunk in the block.
-				 * If there are used chunks after this one, then
-				 * it is a chunk that was skipped due to failing the erased
-				 * check. Just skip it so that it can be deleted.
-				 * But, more typically, We get here when this is an unallocated
-				 * chunk and his means that either the block is empty or
-				 * this is the one being allocated from
-				 */
-
-				if(foundChunksInBlock)
-				{
-					/* This is a chunk that was skipped due to failing the erased check */
-
-				} else if (c == 0) {
-					/* We're looking at the first chunk in the block so the block is unused */
-					state = YAFFS_BLOCK_STATE_EMPTY;
-					dev->nErasedBlocks++;
-				} else {
-					if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-					    state == YAFFS_BLOCK_STATE_ALLOCATING) {
-						if(dev->sequenceNumber == bi->sequenceNumber) {
-							/* this is the block being allocated from */
-
-							T(YAFFS_TRACE_SCAN,
-							  (TSTR
-							   (" Allocating from %d %d"
-							    TENDSTR), blk, c));
-
-							state = YAFFS_BLOCK_STATE_ALLOCATING;
-							dev->allocationBlock = blk;
-							dev->allocationPage = c;
-							dev->allocationBlockFinder = blk;
-						}
-						else {
-							/* This is a partially written block that is not
-							 * the current allocation block. This block must have
-							 * had a write failure, so set up for retirement.
-							 */
-
-							 bi->needsRetiring = 1;
-							 bi->gcPrioritise = 1;
-
-							 T(YAFFS_TRACE_ALWAYS,
-							 (TSTR("Partially written block %d being set for retirement" TENDSTR),
-							 blk));
-						}
-
-					}
-
-				}
-
-				dev->nFreeChunks++;
-
-			} else if (tags.chunkId > 0) {
-				/* chunkId > 0 so it is a data chunk... */
-				unsigned int endpos;
-				__u32 chunkBase =
-				    (tags.chunkId - 1) * dev->nDataBytesPerChunk;
-
-				foundChunksInBlock = 1;
-
-
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
-
-				in = yaffs_FindOrCreateObjectByNumber(dev,
-								      tags.
-								      objectId,
-								      YAFFS_OBJECT_TYPE_FILE);
-				if(!in){
-					/* Out of memory */
-					alloc_failed = 1;
-				}
-
-				if (in &&
-				    in->variantType == YAFFS_OBJECT_TYPE_FILE
-				    && chunkBase <
-				    in->variant.fileVariant.shrinkSize) {
-					/* This has not been invalidated by a resize */
-					if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
-							       chunk, -1)){
-						alloc_failed = 1;
-					}
+	struct yaffs_obj *obj;
+	struct yaffs_obj *parent;
+	int i;
+	struct list_head *lh;
+	struct list_head *n;
+	int depth_limit;
+	int hanging;
 
-					/* File size is calculated by looking at the data chunks if we have not
-					 * seen an object header yet. Stop this practice once we find an object header.
-					 */
-					endpos =
-					    (tags.chunkId -
-					     1) * dev->nDataBytesPerChunk +
-					    tags.byteCount;
-
-					if (!in->valid &&	/* have not got an object header yet */
-					    in->variant.fileVariant.
-					    scannedFileSize < endpos) {
-						in->variant.fileVariant.
-						    scannedFileSize = endpos;
-						in->variant.fileVariant.
-						    fileSize =
-						    in->variant.fileVariant.
-						    scannedFileSize;
-					}
+	if (dev->read_only)
+		return;
 
-				} else if(in) {
-					/* This chunk has been invalidated by a resize, so delete */
-					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+	/* Iterate through the objects in each hash entry,
+	 * looking at each object.
+	 * Make sure it is rooted.
+	 */
 
-				}
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			parent = obj->parent;
+
+			if (yaffs_has_null_parent(dev, obj)) {
+				/* These directories are not hanging */
+				hanging = 0;
+			} else if (!parent ||
+				   parent->variant_type !=
+				   YAFFS_OBJECT_TYPE_DIRECTORY) {
+				hanging = 1;
+			} else if (yaffs_has_null_parent(dev, parent)) {
+				hanging = 0;
 			} else {
-				/* chunkId == 0, so it is an ObjectHeader.
-				 * Thus, we read in the object header and make the object
+				/*
+				 * Need to follow the parent chain to
+				 * see if it is hanging.
 				 */
-				foundChunksInBlock = 1;
-
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
-
-				oh = NULL;
-				in = NULL;
-
-				if (tags.extraHeaderInfoAvailable) {
-					in = yaffs_FindOrCreateObjectByNumber
-					    (dev, tags.objectId,
-					     tags.extraObjectType);
-				}
-
-				if (!in ||
-#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
-				    !in->valid ||
-#endif
-				    tags.extraShadows ||
-				    (!in->valid &&
-				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
-				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
-				    ) {
-
-					/* If we don't have  valid info then we need to read the chunk
-					 * TODO In future we can probably defer reading the chunk and
-					 * living with invalid data until needed.
-					 */
-
-					yaffs_ReadChunkWithTagsFromNAND(dev,
-									chunk,
-									chunkData,
-									NULL);
-
-					oh = (yaffs_ObjectHeader *) chunkData;
-
-					if (!in)
-						in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
-
-				}
-
-				if (!in) {
-					/* TODO Hoosterman we have a problem! */
-					T(YAFFS_TRACE_ERROR,
-					  (TSTR
-					   ("yaffs tragedy: Could not make object for object  %d  "
-					    "at chunk %d during scan"
-					    TENDSTR), tags.objectId, chunk));
-
-				}
-
-				if (in->valid) {
-					/* We have already filled this one.
-					 * We have a duplicate that will be discarded, but
-					 * we first have to suck out resize info if it is a file.
-					 */
-
-					if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
-					     ((oh &&
-					       oh-> type == YAFFS_OBJECT_TYPE_FILE)||
-					      (tags.extraHeaderInfoAvailable  &&
-					       tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
-					    ) {
-						__u32 thisSize =
-						    (oh) ? oh->fileSize : tags.
-						    extraFileLength;
-						__u32 parentObjectId =
-						    (oh) ? oh->
-						    parentObjectId : tags.
-						    extraParentObjectId;
-						unsigned isShrink =
-						    (oh) ? oh->isShrink : tags.
-						    extraIsShrinkHeader;
-
-						/* If it is deleted (unlinked at start also means deleted)
-						 * we treat the file size as being zeroed at this point.
-						 */
-						if (parentObjectId ==
-						    YAFFS_OBJECTID_DELETED
-						    || parentObjectId ==
-						    YAFFS_OBJECTID_UNLINKED) {
-							thisSize = 0;
-							isShrink = 1;
-						}
-
-						if (isShrink &&
-						    in->variant.fileVariant.
-						    shrinkSize > thisSize) {
-							in->variant.fileVariant.
-							    shrinkSize =
-							    thisSize;
-						}
-
-						if (isShrink) {
-							bi->hasShrinkHeader = 1;
-						}
-
-					}
-					/* Use existing - destroy this one. */
-					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
-
+				hanging = 0;
+				depth_limit = 100;
+
+				while (parent != dev->root_dir &&
+				       parent->parent &&
+				       parent->parent->variant_type ==
+				       YAFFS_OBJECT_TYPE_DIRECTORY &&
+				       depth_limit > 0) {
+					parent = parent->parent;
+					depth_limit--;
 				}
-
-				if (!in->valid &&
-				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
-				     tags.objectId ==
-				     YAFFS_OBJECTID_LOSTNFOUND)) {
-					/* We only load some info, don't fiddle with directory structure */
-					in->valid = 1;
-
-					if(oh) {
-						in->variantType = oh->type;
-
-						in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-						in->win_atime[0] = oh->win_atime[0];
-						in->win_ctime[0] = oh->win_ctime[0];
-						in->win_mtime[0] = oh->win_mtime[0];
-						in->win_atime[1] = oh->win_atime[1];
-						in->win_ctime[1] = oh->win_ctime[1];
-						in->win_mtime[1] = oh->win_mtime[1];
-#else
-						in->yst_uid = oh->yst_uid;
-						in->yst_gid = oh->yst_gid;
-						in->yst_atime = oh->yst_atime;
-						in->yst_mtime = oh->yst_mtime;
-						in->yst_ctime = oh->yst_ctime;
-						in->yst_rdev = oh->yst_rdev;
-
-#endif
-					} else {
-						in->variantType = tags.extraObjectType;
-						in->lazyLoaded = 1;
-					}
-
-					in->chunkId = chunk;
-
-				} else if (!in->valid) {
-					/* we need to load this info */
-
-					in->valid = 1;
-					in->chunkId = chunk;
-
-					if(oh) {
-						in->variantType = oh->type;
-
-						in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-						in->win_atime[0] = oh->win_atime[0];
-						in->win_ctime[0] = oh->win_ctime[0];
-						in->win_mtime[0] = oh->win_mtime[0];
-						in->win_atime[1] = oh->win_atime[1];
-						in->win_ctime[1] = oh->win_ctime[1];
-						in->win_mtime[1] = oh->win_mtime[1];
-#else
-						in->yst_uid = oh->yst_uid;
-						in->yst_gid = oh->yst_gid;
-						in->yst_atime = oh->yst_atime;
-						in->yst_mtime = oh->yst_mtime;
-						in->yst_ctime = oh->yst_ctime;
-						in->yst_rdev = oh->yst_rdev;
-#endif
-
-						if (oh->shadowsObject > 0)
-							yaffs_HandleShadowedObject(dev,
-									   oh->
-									   shadowsObject,
-									   1);
-
-
-						yaffs_SetObjectName(in, oh->name);
-						parent =
-						    yaffs_FindOrCreateObjectByNumber
-							(dev, oh->parentObjectId,
-							 YAFFS_OBJECT_TYPE_DIRECTORY);
-
-						 fileSize = oh->fileSize;
-						 isShrink = oh->isShrink;
-						 equivalentObjectId = oh->equivalentObjectId;
-
-					}
-					else {
-						in->variantType = tags.extraObjectType;
-						parent =
-						    yaffs_FindOrCreateObjectByNumber
-							(dev, tags.extraParentObjectId,
-							 YAFFS_OBJECT_TYPE_DIRECTORY);
-						 fileSize = tags.extraFileLength;
-						 isShrink = tags.extraIsShrinkHeader;
-						 equivalentObjectId = tags.extraEquivalentObjectId;
-						in->lazyLoaded = 1;
-
-					}
-					in->dirty = 0;
-
-					/* directory stuff...
-					 * hook up to parent
-					 */
-
-					if (parent->variantType ==
-					    YAFFS_OBJECT_TYPE_UNKNOWN) {
-						/* Set up as a directory */
-						parent->variantType =
-						    YAFFS_OBJECT_TYPE_DIRECTORY;
-						INIT_LIST_HEAD(&parent->variant.
-							       directoryVariant.
-							       children);
-					} else if (parent->variantType !=
-						   YAFFS_OBJECT_TYPE_DIRECTORY)
-					{
-						/* Hoosterman, another problem....
-						 * We're trying to use a non-directory as a directory
-						 */
-
-						T(YAFFS_TRACE_ERROR,
-						  (TSTR
-						   ("yaffs tragedy: attempting to use non-directory as"
-						    " a directory in scan. Put in lost+found."
-						    TENDSTR)));
-						parent = dev->lostNFoundDir;
-					}
-
-					yaffs_AddObjectToDirectory(parent, in);
-
-					itsUnlinked = (parent == dev->deletedDir) ||
-						      (parent == dev->unlinkedDir);
-
-					if (isShrink) {
-						/* Mark the block as having a shrinkHeader */
-						bi->hasShrinkHeader = 1;
-					}
-
-					/* Note re hardlinks.
-					 * Since we might scan a hardlink before its equivalent object is scanned
-					 * we put them all in a list.
-					 * After scanning is complete, we should have all the objects, so we run
-					 * through this list and fix up all the chains.
-					 */
-
-					switch (in->variantType) {
-					case YAFFS_OBJECT_TYPE_UNKNOWN:
-						/* Todo got a problem */
-						break;
-					case YAFFS_OBJECT_TYPE_FILE:
-
-						if (in->variant.fileVariant.
-						    scannedFileSize < fileSize) {
-							/* This covers the case where the file size is greater
-							 * than where the data is
-							 * This will happen if the file is resized to be larger
-							 * than its current data extents.
-							 */
-							in->variant.fileVariant.fileSize = fileSize;
-							in->variant.fileVariant.scannedFileSize =
-							    in->variant.fileVariant.fileSize;
-						}
-
-						if (isShrink &&
-						    in->variant.fileVariant.shrinkSize > fileSize) {
-							in->variant.fileVariant.shrinkSize = fileSize;
-						}
-
-						break;
-					case YAFFS_OBJECT_TYPE_HARDLINK:
-						if(!itsUnlinked) {
-						  in->variant.hardLinkVariant.equivalentObjectId =
-						    equivalentObjectId;
-						  in->hardLinks.next =
-						    (struct list_head *) hardList;
-						  hardList = in;
-						}
-						break;
-					case YAFFS_OBJECT_TYPE_DIRECTORY:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SPECIAL:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SYMLINK:
-						if(oh){
-						   in->variant.symLinkVariant.alias =
-						    yaffs_CloneString(oh->
-								      alias);
-						   if(!in->variant.symLinkVariant.alias)
-							alloc_failed = 1;
-						}
-						break;
-					}
-
-				}
-
+				if (parent != dev->root_dir)
+					hanging = 1;
 			}
-
-		} /* End of scanning for each chunk */
-
-		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-			/* If we got this far while scanning, then the block is fully allocated. */
-			state = YAFFS_BLOCK_STATE_FULL;
-		}
-
-		bi->blockState = state;
-
-		/* Now let's see if it was dirty */
-		if (bi->pagesInUse == 0 &&
-		    !bi->hasShrinkHeader &&
-		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
-			yaffs_BlockBecameDirty(dev, blk);
-		}
-
-	}
-
-	if (altBlockIndex)
-		YFREE_ALT(blockIndex);
-	else
-		YFREE(blockIndex);
-
-	/* Ok, we've done all the scanning.
-	 * Fix up the hard link chains.
-	 * We should now have scanned all the objects, now it's time to add these
-	 * hardlinks.
-	 */
-	yaffs_HardlinkFixup(dev,hardList);
-
-
-	/*
-	*  Sort out state of unlinked and deleted objects.
-	*/
-	{
-		struct list_head *i;
-		struct list_head *n;
-
-		yaffs_Object *l;
-
-		/* Soft delete all the unlinked files */
-		list_for_each_safe(i, n,
-				   &dev->unlinkedDir->variant.directoryVariant.
-				   children) {
-			if (i) {
-				l = list_entry(i, yaffs_Object, siblings);
-				yaffs_DestroyObject(l);
-			}
-		}
-
-		/* Soft delete all the deletedDir files */
-		list_for_each_safe(i, n,
-				   &dev->deletedDir->variant.directoryVariant.
-				   children) {
-			if (i) {
-				l = list_entry(i, yaffs_Object, siblings);
-				yaffs_DestroyObject(l);
-
+			if (hanging) {
+				yaffs_trace(YAFFS_TRACE_SCAN,
+					"Hanging object %d moved to lost and found",
+					obj->obj_id);
+				yaffs_add_obj_to_dir(dev->lost_n_found, obj);
 			}
 		}
 	}
-
-	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
-
-	if(alloc_failed){
-		return YAFFS_FAIL;
-	}
-
-	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
-
-	return YAFFS_OK;
 }
 
-/*------------------------------  Directory Functions ----------------------------- */
-
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_del_dir_contents(struct yaffs_obj *dir)
 {
-	yaffs_Device *dev = obj->myDev;
+	struct yaffs_obj *obj;
+	struct list_head *lh;
+	struct list_head *n;
 
-	if(dev && dev->removeObjectCallback)
-		dev->removeObjectCallback(obj);
+	if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		BUG();
 
-	list_del_init(&obj->siblings);
-	obj->parent = NULL;
+	list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+			yaffs_del_dir_contents(obj);
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"Deleting lost_found object %d",
+			obj->obj_id);
+		yaffs_unlink_obj(obj);
+	}
 }
 
-
-static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
-				       yaffs_Object * obj)
+static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
 {
-
-	if (!directory) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragedy: Trying to add an object to a null pointer directory"
-		    TENDSTR)));
-		YBUG();
-	}
-	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragedy: Trying to add an object to a non-directory"
-		    TENDSTR)));
-		YBUG();
-	}
-
-	if (obj->siblings.prev == NULL) {
-		/* Not initialised */
-		INIT_LIST_HEAD(&obj->siblings);
-
-	} else if (!list_empty(&obj->siblings)) {
-		/* If it is holed up somewhere else, un hook it */
-		yaffs_RemoveObjectFromDirectory(obj);
-	}
-	/* Now add it */
-	list_add(&obj->siblings, &directory->variant.directoryVariant.children);
-	obj->parent = directory;
-
-	if (directory == obj->myDev->unlinkedDir
-	    || directory == obj->myDev->deletedDir) {
-		obj->unlinked = 1;
-		obj->myDev->nUnlinkedFiles++;
-		obj->renameAllowed = 0;
-	}
+	yaffs_del_dir_contents(dev->lost_n_found);
 }
 
-yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
-				     const YCHAR * name)
+
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
+				     const YCHAR *name)
 {
 	int sum;
-
 	struct list_head *i;
 	YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+	struct yaffs_obj *l;
 
-	yaffs_Object *l;
-
-	if (!name) {
+	if (!name)
 		return NULL;
-	}
 
 	if (!directory) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
-		    TENDSTR)));
-		YBUG();
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_find_by_name: null pointer directory"
+			);
+		BUG();
+		return NULL;
 	}
-	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
-		YBUG();
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_find_by_name: non-directory"
+			);
+		BUG();
 	}
 
-	sum = yaffs_CalcNameSum(name);
+	sum = yaffs_calc_name_sum(name);
 
-	list_for_each(i, &directory->variant.directoryVariant.children) {
-		if (i) {
-			l = list_entry(i, yaffs_Object, siblings);
+	list_for_each(i, &directory->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
 
-			yaffs_CheckObjectDetailsLoaded(l);
+		if (l->parent != directory)
+			BUG();
 
-			/* Special case for lost-n-found */
-			if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
-				if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
-					return l;
-				}
-			} else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
-			{
-				/* LostnFound cunk called Objxxx
-				 * Do a real check
-				 */
-				yaffs_GetObjectName(l, buffer,
-						    YAFFS_MAX_NAME_LENGTH);
-				if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
-					return l;
-				}
+		yaffs_check_obj_details_loaded(l);
 
-			}
+		/* Special case for lost-n-found */
+		if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+			if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
+				return l;
+		} else if (l->sum == sum || l->hdr_chunk <= 0) {
+			/* LostnFound chunk called Objxxx
+			 * Do a real check
+			 */
+			yaffs_get_obj_name(l, buffer,
+				YAFFS_MAX_NAME_LENGTH + 1);
+			if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
+				return l;
 		}
 	}
-
 	return NULL;
 }
 
-
-#if 0
-int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
-				   int (*fn) (yaffs_Object *))
-{
-	struct list_head *i;
-	yaffs_Object *l;
-
-	if (!theDir) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
-		    TENDSTR)));
-		YBUG();
-	}
-	if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
-		YBUG();
-	}
-
-	list_for_each(i, &theDir->variant.directoryVariant.children) {
-		if (i) {
-			l = list_entry(i, yaffs_Object, siblings);
-			if (l && !fn(l)) {
-				return YAFFS_FAIL;
-			}
-		}
-	}
-
-	return YAFFS_OK;
-
-}
-#endif
-
 /* GetEquivalentObject dereferences any hard links to get to the
  * actual object.
  */
 
-yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
 {
-	if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-		/* We want the object id of the equivalent object, not this one */
-		obj = obj->variant.hardLinkVariant.equivalentObject;
-		yaffs_CheckObjectDetailsLoaded(obj);
+	if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+		obj = obj->variant.hardlink_variant.equiv_obj;
+		yaffs_check_obj_details_loaded(obj);
 	}
 	return obj;
-
 }
 
-int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
-{
-	memset(name, 0, buffSize * sizeof(YCHAR));
-
-	yaffs_CheckObjectDetailsLoaded(obj);
+/*
+ *  A note or two on object names.
+ *  * If the object name is missing, we then make one up in the form objnnn
+ *
+ *  * ASCII names are stored in the object header's name field from byte zero
+ *  * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ *  - If the name can fit in the ASCII character space then they are saved as
+ *    ascii names as per above.
+ *  - If the name needs Unicode then the name is saved in Unicode
+ *    starting at oh->name[1].
 
-	if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
-		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
-	} else if (obj->chunkId <= 0) {
-		YCHAR locName[20];
+ */
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
+				int buffer_size)
+{
+	/* Create an object name if we could not find one. */
+	if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
+		YCHAR local_name[20];
+		YCHAR num_string[20];
+		YCHAR *x = &num_string[19];
+		unsigned v = obj->obj_id;
+		num_string[19] = 0;
+		while (v > 0) {
+			x--;
+			*x = '0' + (v % 10);
+			v /= 10;
+		}
 		/* make up a name */
-		yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
-			      obj->objectId);
-		yaffs_strncpy(name, locName, buffSize - 1);
-
-	}
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-	else if (obj->shortName[0]) {
-		yaffs_strcpy(name, obj->shortName);
+		yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
+		yaffs_strcat(local_name, x);
+		yaffs_strncpy(name, local_name, buffer_size - 1);
 	}
-#endif
-	else {
-		__u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
+}
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
+{
+	memset(name, 0, buffer_size * sizeof(YCHAR));
+	yaffs_check_obj_details_loaded(obj);
+	if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
+	} else if (obj->short_name[0]) {
+		yaffs_strcpy(name, obj->short_name);
+	} else if (obj->hdr_chunk > 0) {
+		int result;
+		u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
 
-		yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
+		struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
 
-		memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
+		memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
 
-		if (obj->chunkId >= 0) {
-			yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
-							obj->chunkId, buffer,
-							NULL);
+		if (obj->hdr_chunk > 0) {
+			result = yaffs_rd_chunk_tags_nand(obj->my_dev,
+							  obj->hdr_chunk,
+							  buffer, NULL);
 		}
-		yaffs_strncpy(name, oh->name, buffSize - 1);
+		yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
+					buffer_size);
 
-		yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
+		yaffs_release_temp_buffer(obj->my_dev, buffer);
 	}
 
-	return yaffs_strlen(name);
+	yaffs_fix_null_name(obj, name, buffer_size);
+
+	return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
 }
 
-int yaffs_GetObjectFileLength(yaffs_Object * obj)
+loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
 {
-
 	/* Dereference any hard linking */
-	obj = yaffs_GetEquivalentObject(obj);
+	obj = yaffs_get_equivalent_obj(obj);
 
-	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-		return obj->variant.fileVariant.fileSize;
-	}
-	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
-		return yaffs_strlen(obj->variant.symLinkVariant.alias);
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		return obj->variant.file_variant.file_size;
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		if (!obj->variant.symlink_variant.alias)
+			return 0;
+		return yaffs_strnlen(obj->variant.symlink_variant.alias,
+				     YAFFS_MAX_ALIAS_LENGTH);
 	} else {
 		/* Only a directory should drop through to here */
-		return obj->myDev->nDataBytesPerChunk;
+		return obj->my_dev->data_bytes_per_chunk;
 	}
 }
 
-int yaffs_GetObjectLinkCount(yaffs_Object * obj)
+int yaffs_get_obj_link_count(struct yaffs_obj *obj)
 {
 	int count = 0;
 	struct list_head *i;
 
-	if (!obj->unlinked) {
+	if (!obj->unlinked)
 		count++;	/* the object itself */
-	}
-	list_for_each(i, &obj->hardLinks) {
-		count++;	/* add the hard links; */
-	}
-	return count;
 
+	list_for_each(i, &obj->hard_links)
+	    count++;		/* add the hard links; */
+
+	return count;
 }
 
-int yaffs_GetObjectInode(yaffs_Object * obj)
+int yaffs_get_obj_inode(struct yaffs_obj *obj)
 {
-	obj = yaffs_GetEquivalentObject(obj);
+	obj = yaffs_get_equivalent_obj(obj);
 
-	return obj->objectId;
+	return obj->obj_id;
 }
 
-unsigned yaffs_GetObjectType(yaffs_Object * obj)
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
 {
-	obj = yaffs_GetEquivalentObject(obj);
+	obj = yaffs_get_equivalent_obj(obj);
 
-	switch (obj->variantType) {
+	switch (obj->variant_type) {
 	case YAFFS_OBJECT_TYPE_FILE:
 		return DT_REG;
 		break;
@@ -6725,605 +4532,501 @@ unsigned yaffs_GetObjectType(yaffs_Object * obj)
 			return DT_BLK;
 		if (S_ISSOCK(obj->yst_mode))
 			return DT_SOCK;
+		return DT_REG;
+		break;
 	default:
 		return DT_REG;
 		break;
 	}
 }
 
-YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
-{
-	obj = yaffs_GetEquivalentObject(obj);
-	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
-		return yaffs_CloneString(obj->variant.symLinkVariant.alias);
-	} else {
-		return yaffs_CloneString(_Y(""));
-	}
-}
-
-#ifndef CONFIG_YAFFS_WINCE
-
-int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
-{
-	unsigned int valid = attr->ia_valid;
-
-	if (valid & ATTR_MODE)
-		obj->yst_mode = attr->ia_mode;
-	if (valid & ATTR_UID)
-		obj->yst_uid = attr->ia_uid;
-	if (valid & ATTR_GID)
-		obj->yst_gid = attr->ia_gid;
-
-	if (valid & ATTR_ATIME)
-		obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
-	if (valid & ATTR_CTIME)
-		obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
-	if (valid & ATTR_MTIME)
-		obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
-
-	if (valid & ATTR_SIZE)
-		yaffs_ResizeFile(obj, attr->ia_size);
-
-	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
-
-	return YAFFS_OK;
-
-}
-int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
 {
-	unsigned int valid = 0;
-
-	attr->ia_mode = obj->yst_mode;
-	valid |= ATTR_MODE;
-	attr->ia_uid = obj->yst_uid;
-	valid |= ATTR_UID;
-	attr->ia_gid = obj->yst_gid;
-	valid |= ATTR_GID;
-
-	Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
-	valid |= ATTR_ATIME;
-	Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
-	valid |= ATTR_CTIME;
-	Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
-	valid |= ATTR_MTIME;
-
-	attr->ia_size = yaffs_GetFileSize(obj);
-	valid |= ATTR_SIZE;
-
-	attr->ia_valid = valid;
-
-	return YAFFS_OK;
-
-}
-
-#endif
-
-#if 0
-int yaffs_DumpObject(yaffs_Object * obj)
-{
-	YCHAR name[257];
-
-	yaffs_GetObjectName(obj, name, 256);
-
-	T(YAFFS_TRACE_ALWAYS,
-	  (TSTR
-	   ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
-	    " chunk %d type %d size %d\n"
-	    TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
-	   obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
-	   yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
-
-	return YAFFS_OK;
+	obj = yaffs_get_equivalent_obj(obj);
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+		return yaffs_clone_str(obj->variant.symlink_variant.alias);
+	else
+		return yaffs_clone_str(_Y(""));
 }
-#endif
 
-/*---------------------------- Initialisation code -------------------------------------- */
+/*--------------------------- Initialisation code -------------------------- */
 
-static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
+static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
 {
-
 	/* Common functions, gotta have */
-	if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
+	if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
 		return 0;
 
-#ifdef CONFIG_YAFFS_YAFFS2
-
 	/* Can use the "with tags" style interface for yaffs1 or yaffs2 */
-	if (dev->writeChunkWithTagsToNAND &&
-	    dev->readChunkWithTagsFromNAND &&
-	    !dev->writeChunkToNAND &&
-	    !dev->readChunkFromNAND &&
-	    dev->markNANDBlockBad && dev->queryNANDBlock)
+	if (dev->param.write_chunk_tags_fn &&
+	    dev->param.read_chunk_tags_fn &&
+	    !dev->param.write_chunk_fn &&
+	    !dev->param.read_chunk_fn &&
+	    dev->param.bad_block_fn && dev->param.query_block_fn)
 		return 1;
-#endif
 
 	/* Can use the "spare" style interface for yaffs1 */
-	if (!dev->isYaffs2 &&
-	    !dev->writeChunkWithTagsToNAND &&
-	    !dev->readChunkWithTagsFromNAND &&
-	    dev->writeChunkToNAND &&
-	    dev->readChunkFromNAND &&
-	    !dev->markNANDBlockBad && !dev->queryNANDBlock)
+	if (!dev->param.is_yaffs2 &&
+	    !dev->param.write_chunk_tags_fn &&
+	    !dev->param.read_chunk_tags_fn &&
+	    dev->param.write_chunk_fn &&
+	    dev->param.read_chunk_fn &&
+	    !dev->param.bad_block_fn && !dev->param.query_block_fn)
 		return 1;
 
 	return 0;		/* bad */
 }
 
-
-static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
-{
-	/* Initialise the unlinked, deleted, root and lost and found directories */
-
-	dev->lostNFoundDir = dev->rootDir =  NULL;
-	dev->unlinkedDir = dev->deletedDir = NULL;
-
-	dev->unlinkedDir =
-	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
-
-	dev->deletedDir =
-	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
-
-	dev->rootDir =
-	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
-				      YAFFS_ROOT_MODE | S_IFDIR);
-	dev->lostNFoundDir =
-	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
-				      YAFFS_LOSTNFOUND_MODE | S_IFDIR);
-
-	if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
-		yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
+static int yaffs_create_initial_dir(struct yaffs_dev *dev)
+{
+	/* Initialise the unlinked, deleted, root and lost+found directories */
+	dev->lost_n_found = dev->root_dir = NULL;
+	dev->unlinked_dir = dev->del_dir = NULL;
+	dev->unlinked_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+	dev->del_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+	dev->root_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
+				  YAFFS_ROOT_MODE | S_IFDIR);
+	dev->lost_n_found =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
+				  YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+
+	if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
+	    && dev->del_dir) {
+		yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
 		return YAFFS_OK;
 	}
-
 	return YAFFS_FAIL;
 }
 
-int yaffs_GutsInitialise(yaffs_Device * dev)
+int yaffs_guts_initialise(struct yaffs_dev *dev)
 {
 	int init_failed = 0;
 	unsigned x;
 	int bits;
 
-	T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
+	yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
 
 	/* Check stuff that must be set */
 
 	if (!dev) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs: Need a device"
+			);
+		return YAFFS_FAIL;
+	}
+
+	if (dev->is_mounted) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
 		return YAFFS_FAIL;
 	}
 
-	dev->internalStartBlock = dev->startBlock;
-	dev->internalEndBlock = dev->endBlock;
-	dev->blockOffset = 0;
-	dev->chunkOffset = 0;
-	dev->nFreeChunks = 0;
+	dev->internal_start_block = dev->param.start_block;
+	dev->internal_end_block = dev->param.end_block;
+	dev->block_offset = 0;
+	dev->chunk_offset = 0;
+	dev->n_free_chunks = 0;
+
+	dev->gc_block = 0;
 
-	if (dev->startBlock == 0) {
-		dev->internalStartBlock = dev->startBlock + 1;
-		dev->internalEndBlock = dev->endBlock + 1;
-		dev->blockOffset = 1;
-		dev->chunkOffset = dev->nChunksPerBlock;
+	if (dev->param.start_block == 0) {
+		dev->internal_start_block = dev->param.start_block + 1;
+		dev->internal_end_block = dev->param.end_block + 1;
+		dev->block_offset = 1;
+		dev->chunk_offset = dev->param.chunks_per_block;
 	}
 
 	/* Check geometry parameters. */
 
-	if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
-	    (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
-	     dev->nChunksPerBlock < 2 ||
-	     dev->nReservedBlocks < 2 ||
-	     dev->internalStartBlock <= 0 ||
-	     dev->internalEndBlock <= 0 ||
-	     dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)	// otherwise it is too small
-	    ) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
-		    TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
+	if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
+		dev->param.total_bytes_per_chunk < 1024) ||
+		(!dev->param.is_yaffs2 &&
+			dev->param.total_bytes_per_chunk < 512) ||
+		(dev->param.inband_tags && !dev->param.is_yaffs2) ||
+		 dev->param.chunks_per_block < 2 ||
+		 dev->param.n_reserved_blocks < 2 ||
+		dev->internal_start_block <= 0 ||
+		dev->internal_end_block <= 0 ||
+		dev->internal_end_block <=
+		(dev->internal_start_block + dev->param.n_reserved_blocks + 2)
+		) {
+		/* otherwise it is too small */
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
+			dev->param.total_bytes_per_chunk,
+			dev->param.is_yaffs2 ? "2" : "",
+			dev->param.inband_tags);
 		return YAFFS_FAIL;
 	}
 
-	if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
+	if (yaffs_init_nand(dev) != YAFFS_OK) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
 		return YAFFS_FAIL;
 	}
 
+	/* Sort out space for inband tags, if required */
+	if (dev->param.inband_tags)
+		dev->data_bytes_per_chunk =
+		    dev->param.total_bytes_per_chunk -
+		    sizeof(struct yaffs_packed_tags2_tags_only);
+	else
+		dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
+
 	/* Got the right mix of functions? */
-	if (!yaffs_CheckDevFunctions(dev)) {
+	if (!yaffs_check_dev_fns(dev)) {
 		/* Function missing */
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"device function(s) missing or wrong");
 
 		return YAFFS_FAIL;
 	}
 
-	/* This is really a compilation check. */
-	if (!yaffs_CheckStructures()) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	if (dev->isMounted) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR("yaffs: device already mounted\n" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	/* Finished with most checks. One or two more checks happen later on too. */
-
-	dev->isMounted = 1;
-
+	/* Finished with most checks. Further checks happen later on too. */
 
+	dev->is_mounted = 1;
 
 	/* OK now calculate a few things for the device */
 
 	/*
 	 *  Calculate all the chunk size manipulation numbers:
 	 */
-	 /* Start off assuming it is a power of 2 */
-	 dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
-	 dev->chunkMask = (1<<dev->chunkShift) - 1;
-
-	 if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
-		/* Yes it is a power of 2, disable crumbs */
-		dev->crumbMask = 0;
-		dev->crumbShift = 0;
-		dev->crumbsPerChunk = 0;
-	 } else {
-		/* Not a power of 2, use crumbs instead */
-		dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
-		dev->crumbMask = (1<<dev->crumbShift)-1;
-		dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
-		dev->chunkShift = 0;
-		dev->chunkMask = 0;
-	}
-
+	x = dev->data_bytes_per_chunk;
+	/* We always use dev->chunk_shift and dev->chunk_div */
+	dev->chunk_shift = calc_shifts(x);
+	x >>= dev->chunk_shift;
+	dev->chunk_div = x;
+	/* We only use chunk mask if chunk_div is 1 */
+	dev->chunk_mask = (1 << dev->chunk_shift) - 1;
 
 	/*
-	 * Calculate chunkGroupBits.
-	 * We need to find the next power of 2 > than internalEndBlock
+	 * Calculate chunk_grp_bits.
+	 * We need to find the next power of 2 > than internal_end_block
 	 */
 
-	x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
+	x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
 
-	bits = ShiftsGE(x);
+	bits = calc_shifts_ceiling(x);
 
 	/* Set up tnode width if wide tnodes are enabled. */
-	if(!dev->wideTnodesDisabled){
+	if (!dev->param.wide_tnodes_disabled) {
 		/* bits must be even so that we end up with 32-bit words */
-		if(bits & 1)
+		if (bits & 1)
 			bits++;
-		if(bits < 16)
-			dev->tnodeWidth = 16;
+		if (bits < 16)
+			dev->tnode_width = 16;
 		else
-			dev->tnodeWidth = bits;
+			dev->tnode_width = bits;
+	} else {
+		dev->tnode_width = 16;
 	}
-	else
-		dev->tnodeWidth = 16;
 
-	dev->tnodeMask = (1<<dev->tnodeWidth)-1;
+	dev->tnode_mask = (1 << dev->tnode_width) - 1;
 
 	/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
 	 * so if the bitwidth of the
 	 * chunk range we're using is greater than 16 we need
-	 * to figure out chunk shift and chunkGroupSize
+	 * to figure out chunk shift and chunk_grp_size
 	 */
 
-	if (bits <= dev->tnodeWidth)
-		dev->chunkGroupBits = 0;
+	if (bits <= dev->tnode_width)
+		dev->chunk_grp_bits = 0;
 	else
-		dev->chunkGroupBits = bits - dev->tnodeWidth;
+		dev->chunk_grp_bits = bits - dev->tnode_width;
 
+	dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
+	if (dev->tnode_size < sizeof(struct yaffs_tnode))
+		dev->tnode_size = sizeof(struct yaffs_tnode);
 
-	dev->chunkGroupSize = 1 << dev->chunkGroupBits;
+	dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
 
-	if (dev->nChunksPerBlock < dev->chunkGroupSize) {
+	if (dev->param.chunks_per_block < dev->chunk_grp_size) {
 		/* We have a problem because the soft delete won't work if
 		 * the chunk group size > chunks per block.
 		 * This can be remedied by using larger "virtual blocks".
 		 */
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR("yaffs: chunk group too large\n" TENDSTR)));
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
 
 		return YAFFS_FAIL;
 	}
 
-	/* OK, we've finished verifying the device, lets continue with initialisation */
+	/* Finished verifying the device, continue with initialisation */
 
 	/* More device initialisation */
-	dev->garbageCollections = 0;
-	dev->passiveGarbageCollections = 0;
-	dev->currentDirtyChecker = 0;
-	dev->bufferedBlock = -1;
-	dev->doingBufferedBlockRewrite = 0;
-	dev->nDeletedFiles = 0;
-	dev->nBackgroundDeletions = 0;
-	dev->nUnlinkedFiles = 0;
-	dev->eccFixed = 0;
-	dev->eccUnfixed = 0;
-	dev->tagsEccFixed = 0;
-	dev->tagsEccUnfixed = 0;
-	dev->nErasureFailures = 0;
-	dev->nErasedBlocks = 0;
-	dev->isDoingGC = 0;
-	dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
+	dev->all_gcs = 0;
+	dev->passive_gc_count = 0;
+	dev->oldest_dirty_gc_count = 0;
+	dev->bg_gcs = 0;
+	dev->gc_block_finder = 0;
+	dev->buffered_block = -1;
+	dev->doing_buffered_block_rewrite = 0;
+	dev->n_deleted_files = 0;
+	dev->n_bg_deletions = 0;
+	dev->n_unlinked_files = 0;
+	dev->n_ecc_fixed = 0;
+	dev->n_ecc_unfixed = 0;
+	dev->n_tags_ecc_fixed = 0;
+	dev->n_tags_ecc_unfixed = 0;
+	dev->n_erase_failures = 0;
+	dev->n_erased_blocks = 0;
+	dev->gc_disable = 0;
+	dev->has_pending_prioritised_gc = 1;
+		/* Assume the worst for now, will get fixed on first GC */
+	INIT_LIST_HEAD(&dev->dirty_dirs);
+	dev->oldest_dirty_seq = 0;
+	dev->oldest_dirty_block = 0;
 
 	/* Initialise temporary buffers and caches. */
-	if(!yaffs_InitialiseTempBuffers(dev))
+	if (!yaffs_init_tmp_buffers(dev))
 		init_failed = 1;
 
-	dev->srCache = NULL;
-	dev->gcCleanupList = NULL;
+	dev->cache = NULL;
+	dev->gc_cleanup_list = NULL;
 
-
-	if (!init_failed &&
-	    dev->nShortOpCaches > 0) {
+	if (!init_failed && dev->param.n_caches > 0) {
 		int i;
-		__u8 *buf;
-		int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
+		void *buf;
+		int cache_bytes =
+		    dev->param.n_caches * sizeof(struct yaffs_cache);
 
-		if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
-			dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
-		}
+		if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
+			dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
 
-		dev->srCache = YMALLOC(srCacheBytes);
-		buf = (__u8 *)dev->srCache;
+		dev->cache = kmalloc(cache_bytes, GFP_NOFS);
 
-		if(dev->srCache)
-			memset(dev->srCache,0,srCacheBytes);
+		buf = (u8 *) dev->cache;
 
-		for (i = 0; i < dev->nShortOpCaches && buf; i++) {
-			dev->srCache[i].object = NULL;
-			dev->srCache[i].lastUse = 0;
-			dev->srCache[i].dirty = 0;
-			dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
+		if (dev->cache)
+			memset(dev->cache, 0, cache_bytes);
+
+		for (i = 0; i < dev->param.n_caches && buf; i++) {
+			dev->cache[i].object = NULL;
+			dev->cache[i].last_use = 0;
+			dev->cache[i].dirty = 0;
+			dev->cache[i].data = buf =
+			    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
 		}
-		if(!buf)
+		if (!buf)
 			init_failed = 1;
 
-		dev->srLastUse = 0;
+		dev->cache_last_use = 0;
 	}
 
-	dev->cacheHits = 0;
+	dev->cache_hits = 0;
 
-	if(!init_failed){
-		dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
-		if(!dev->gcCleanupList)
+	if (!init_failed) {
+		dev->gc_cleanup_list =
+		    kmalloc(dev->param.chunks_per_block * sizeof(u32),
+					GFP_NOFS);
+		if (!dev->gc_cleanup_list)
 			init_failed = 1;
 	}
 
-	if (dev->isYaffs2) {
-		dev->useHeaderFileSize = 1;
-	}
-	if(!init_failed && !yaffs_InitialiseBlocks(dev))
+	if (dev->param.is_yaffs2)
+		dev->param.use_header_file_size = 1;
+
+	if (!init_failed && !yaffs_init_blocks(dev))
 		init_failed = 1;
 
-	yaffs_InitialiseTnodes(dev);
-	yaffs_InitialiseObjects(dev);
+	yaffs_init_tnodes_and_objs(dev);
 
-	if(!init_failed && !yaffs_CreateInitialDirectories(dev))
+	if (!init_failed && !yaffs_create_initial_dir(dev))
 		init_failed = 1;
 
+	if (!init_failed && dev->param.is_yaffs2 &&
+		!dev->param.disable_summary &&
+		!yaffs_summary_init(dev))
+		init_failed = 1;
 
-	if(!init_failed){
+	if (!init_failed) {
 		/* Now scan the flash. */
-		if (dev->isYaffs2) {
-			if(yaffs_CheckpointRestore(dev)) {
-				T(YAFFS_TRACE_ALWAYS,
-				  (TSTR("yaffs: restored from checkpoint" TENDSTR)));
+		if (dev->param.is_yaffs2) {
+			if (yaffs2_checkpt_restore(dev)) {
+				yaffs_check_obj_details_loaded(dev->root_dir);
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT |
+					YAFFS_TRACE_MOUNT,
+					"yaffs: restored from checkpoint"
+					);
 			} else {
 
-				/* Clean up the mess caused by an aborted checkpoint load
-				 * and scan backwards.
+				/* Clean up the mess caused by an aborted
+				 * checkpoint load then scan backwards.
 				 */
-				yaffs_DeinitialiseBlocks(dev);
-				yaffs_DeinitialiseTnodes(dev);
-				yaffs_DeinitialiseObjects(dev);
+				yaffs_deinit_blocks(dev);
 
+				yaffs_deinit_tnodes_and_objs(dev);
 
-				dev->nErasedBlocks = 0;
-				dev->nFreeChunks = 0;
-				dev->allocationBlock = -1;
-				dev->allocationPage = -1;
-				dev->nDeletedFiles = 0;
-				dev->nUnlinkedFiles = 0;
-				dev->nBackgroundDeletions = 0;
-				dev->oldestDirtySequence = 0;
+				dev->n_erased_blocks = 0;
+				dev->n_free_chunks = 0;
+				dev->alloc_block = -1;
+				dev->alloc_page = -1;
+				dev->n_deleted_files = 0;
+				dev->n_unlinked_files = 0;
+				dev->n_bg_deletions = 0;
 
-				if(!init_failed && !yaffs_InitialiseBlocks(dev))
+				if (!init_failed && !yaffs_init_blocks(dev))
 					init_failed = 1;
 
-				yaffs_InitialiseTnodes(dev);
-				yaffs_InitialiseObjects(dev);
+				yaffs_init_tnodes_and_objs(dev);
 
-				if(!init_failed && !yaffs_CreateInitialDirectories(dev))
+				if (!init_failed
+				    && !yaffs_create_initial_dir(dev))
 					init_failed = 1;
 
-				if(!init_failed && !yaffs_ScanBackwards(dev))
+				if (!init_failed && !yaffs2_scan_backwards(dev))
 					init_failed = 1;
 			}
-		}else
-			if(!yaffs_Scan(dev))
-				init_failed = 1;
+		} else if (!yaffs1_scan(dev)) {
+			init_failed = 1;
+		}
+
+		yaffs_strip_deleted_objs(dev);
+		yaffs_fix_hanging_objs(dev);
+		if (dev->param.empty_lost_n_found)
+			yaffs_empty_l_n_f(dev);
 	}
 
-	if(init_failed){
+	if (init_failed) {
 		/* Clean up the mess */
-		T(YAFFS_TRACE_TRACING,
-		  (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
+		yaffs_trace(YAFFS_TRACE_TRACING,
+		  "yaffs: yaffs_guts_initialise() aborted.");
 
-		yaffs_Deinitialise(dev);
+		yaffs_deinitialise(dev);
 		return YAFFS_FAIL;
 	}
 
 	/* Zero out stats */
-	dev->nPageReads = 0;
-	dev->nPageWrites = 0;
-	dev->nBlockErasures = 0;
-	dev->nGCCopies = 0;
-	dev->nRetriedWrites = 0;
+	dev->n_page_reads = 0;
+	dev->n_page_writes = 0;
+	dev->n_erasures = 0;
+	dev->n_gc_copies = 0;
+	dev->n_retried_writes = 0;
 
-	dev->nRetiredBlocks = 0;
+	dev->n_retired_blocks = 0;
 
-	yaffs_VerifyFreeChunks(dev);
-	yaffs_VerifyBlocks(dev);
+	yaffs_verify_free_chunks(dev);
+	yaffs_verify_blocks(dev);
 
+	/* Clean up any aborted checkpoint data */
+	if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
+		yaffs2_checkpt_invalidate(dev);
 
-	T(YAFFS_TRACE_TRACING,
-	  (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
+	yaffs_trace(YAFFS_TRACE_TRACING,
+	  "yaffs: yaffs_guts_initialise() done.");
 	return YAFFS_OK;
-
 }
 
-void yaffs_Deinitialise(yaffs_Device * dev)
+void yaffs_deinitialise(struct yaffs_dev *dev)
 {
-	if (dev->isMounted) {
+	if (dev->is_mounted) {
 		int i;
 
-		yaffs_DeinitialiseBlocks(dev);
-		yaffs_DeinitialiseTnodes(dev);
-		yaffs_DeinitialiseObjects(dev);
-		if (dev->nShortOpCaches > 0 &&
-		    dev->srCache) {
+		yaffs_deinit_blocks(dev);
+		yaffs_deinit_tnodes_and_objs(dev);
+		yaffs_summary_deinit(dev);
+
+		if (dev->param.n_caches > 0 && dev->cache) {
 
-			for (i = 0; i < dev->nShortOpCaches; i++) {
-				if(dev->srCache[i].data)
-					YFREE(dev->srCache[i].data);
-				dev->srCache[i].data = NULL;
+			for (i = 0; i < dev->param.n_caches; i++) {
+				kfree(dev->cache[i].data);
+				dev->cache[i].data = NULL;
 			}
 
-			YFREE(dev->srCache);
-			dev->srCache = NULL;
+			kfree(dev->cache);
+			dev->cache = NULL;
 		}
 
-		YFREE(dev->gcCleanupList);
+		kfree(dev->gc_cleanup_list);
 
-		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-			YFREE(dev->tempBuffer[i].buffer);
-		}
+		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+			kfree(dev->temp_buffer[i].buffer);
 
-		dev->isMounted = 0;
-	}
+		dev->is_mounted = 0;
 
+		if (dev->param.deinitialise_flash_fn)
+			dev->param.deinitialise_flash_fn(dev);
+	}
 }
 
-static int yaffs_CountFreeChunks(yaffs_Device * dev)
+int yaffs_count_free_chunks(struct yaffs_dev *dev)
 {
-	int nFree;
+	int n_free = 0;
 	int b;
+	struct yaffs_block_info *blk;
 
-	yaffs_BlockInfo *blk;
-
-	for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
-	     b++) {
-		blk = yaffs_GetBlockInfo(dev, b);
-
-		switch (blk->blockState) {
+	blk = dev->block_info;
+	for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+		switch (blk->block_state) {
 		case YAFFS_BLOCK_STATE_EMPTY:
 		case YAFFS_BLOCK_STATE_ALLOCATING:
 		case YAFFS_BLOCK_STATE_COLLECTING:
 		case YAFFS_BLOCK_STATE_FULL:
-			nFree +=
-			    (dev->nChunksPerBlock - blk->pagesInUse +
-			     blk->softDeletions);
+			n_free +=
+			    (dev->param.chunks_per_block - blk->pages_in_use +
+			     blk->soft_del_pages);
 			break;
 		default:
 			break;
 		}
-
+		blk++;
 	}
-
-	return nFree;
+	return n_free;
 }
 
-int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
 {
 	/* This is what we report to the outside world */
+	int n_free;
+	int n_dirty_caches;
+	int blocks_for_checkpt;
+	int i;
 
-	int nFree;
-	int nDirtyCacheChunks;
-	int blocksForCheckpoint;
-
-#if 1
-	nFree = dev->nFreeChunks;
-#else
-	nFree = yaffs_CountFreeChunks(dev);
-#endif
-
-	nFree += dev->nDeletedFiles;
+	n_free = dev->n_free_chunks;
+	n_free += dev->n_deleted_files;
 
-	/* Now count the number of dirty chunks in the cache and subtract those */
+	/* Now count and subtract the number of dirty chunks in the cache. */
 
-	{
-		int i;
-		for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
-			if (dev->srCache[i].dirty)
-				nDirtyCacheChunks++;
-		}
+	for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].dirty)
+			n_dirty_caches++;
 	}
 
-	nFree -= nDirtyCacheChunks;
-
-	nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
+	n_free -= n_dirty_caches;
 
-	/* Now we figure out how much to reserve for the checkpoint and report that... */
-	blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
-	if(blocksForCheckpoint < 0)
-		blocksForCheckpoint = 0;
+	n_free -=
+	    ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
 
-	nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
+	/* Now figure checkpoint space and report that... */
+	blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
 
-	if (nFree < 0)
-		nFree = 0;
+	n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
 
-	return nFree;
+	if (n_free < 0)
+		n_free = 0;
 
+	return n_free;
 }
 
-static int yaffs_freeVerificationFailures;
-
-static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
+/*\
+ * Marshalling functions to get loff_t file sizes into aand out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
 {
-	int counted;
-	int difference;
-
-	if(yaffs_SkipVerification(dev))
-		return;
-
-	counted = yaffs_CountFreeChunks(dev);
-
-	difference = dev->nFreeChunks - counted;
-
-	if (difference) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
-		   dev->nFreeChunks, counted, difference));
-		yaffs_freeVerificationFailures++;
-	}
+	oh->file_size_low = (fsize & 0xFFFFFFFF);
+	oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
 }
 
-/*---------------------------------------- YAFFS test code ----------------------*/
-
-#define yaffs_CheckStruct(structure,syze, name) \
-	   if(sizeof(structure) != syze) \
-	       { \
-		 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
-		 name,syze,sizeof(structure))); \
-		 return YAFFS_FAIL; \
-		}
-
-static int yaffs_CheckStructures(void)
+loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
 {
-/*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
-/*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
-/*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
-#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
-	yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
-#endif
-	    yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
+	loff_t retval;
+
+	if (~(oh->file_size_high))
+		retval = (((loff_t) oh->file_size_high) << 32) |
+			(((loff_t) oh->file_size_low) & 0xFFFFFFFF);
+	else
+		retval = (loff_t) oh->file_size_low;
 
-	    return YAFFS_OK;
+	return retval;
 }
diff --git a/fs/yaffs2/yaffs_guts.h b/fs/yaffs2/yaffs_guts.h
index 1f75efd..e3558c5 100644
--- a/fs/yaffs2/yaffs_guts.h
+++ b/fs/yaffs2/yaffs_guts.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -16,7 +16,6 @@
 #ifndef __YAFFS_GUTS_H__
 #define __YAFFS_GUTS_H__
 
-#include "devextras.h"
 #include "yportenv.h"
 
 #define YAFFS_OK	1
@@ -24,35 +23,48 @@
 
 /* Give us a  Y=0x59,
  * Give us an A=0x41,
- * Give us an FF=0xFF
+ * Give us an FF=0xff
  * Give us an S=0x53
  * And what have we got...
  */
-#define YAFFS_MAGIC			0x5941FF53
+#define YAFFS_MAGIC			0x5941ff53
 
-#define YAFFS_NTNODES_LEVEL0	  	16
+/*
+ * Tnodes form a tree with the tnodes in "levels"
+ * Levels greater than 0 hold 8 slots which point to other tnodes.
+ * Those at level 0 hold 16 slots which point to chunks in NAND.
+ *
+ * A maximum level of 8 thust supports files of size up to:
+ *
+ * 2^(3*MAX_LEVEL+4)
+ *
+ * Thus a max level of 8 supports files with up to 2^^28 chunks which gives
+ * a maximum file size of arounf 51Gbytees with 2k chunks.
+ */
+#define YAFFS_NTNODES_LEVEL0		16
 #define YAFFS_TNODES_LEVEL0_BITS	4
 #define YAFFS_TNODES_LEVEL0_MASK	0xf
 
-#define YAFFS_NTNODES_INTERNAL 		(YAFFS_NTNODES_LEVEL0 / 2)
-#define YAFFS_TNODES_INTERNAL_BITS 	(YAFFS_TNODES_LEVEL0_BITS - 1)
+#define YAFFS_NTNODES_INTERNAL		(YAFFS_NTNODES_LEVEL0 / 2)
+#define YAFFS_TNODES_INTERNAL_BITS	(YAFFS_TNODES_LEVEL0_BITS - 1)
 #define YAFFS_TNODES_INTERNAL_MASK	0x7
-#define YAFFS_TNODES_MAX_LEVEL		6
+#define YAFFS_TNODES_MAX_LEVEL		8
+#define YAFFS_TNODES_MAX_BITS		(YAFFS_TNODES_LEVEL0_BITS + \
+					YAFFS_TNODES_INTERNAL_BITS * \
+					YAFFS_TNODES_MAX_LEVEL)
+#define YAFFS_MAX_CHUNK_ID		((1 << YAFFS_TNODES_MAX_BITS) - 1)
 
-#ifndef CONFIG_YAFFS_NO_YAFFS1
+/* Constants for YAFFS1 mode */
 #define YAFFS_BYTES_PER_SPARE		16
 #define YAFFS_BYTES_PER_CHUNK		512
 #define YAFFS_CHUNK_SIZE_SHIFT		9
 #define YAFFS_CHUNKS_PER_BLOCK		32
-#define YAFFS_BYTES_PER_BLOCK		(YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
-#endif
+#define YAFFS_BYTES_PER_BLOCK	(YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
 
-#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 	1024
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE	1024
 #define YAFFS_MIN_YAFFS2_SPARE_SIZE	32
 
-#define YAFFS_MAX_CHUNK_ID		0x000FFFFF
 
-#define YAFFS_UNUSED_OBJECT_ID		0x0003FFFF
 
 #define YAFFS_ALLOCATION_NOBJECTS	100
 #define YAFFS_ALLOCATION_NTNODES	100
@@ -60,10 +72,12 @@
 
 #define YAFFS_NOBJECT_BUCKETS		256
 
-
 #define YAFFS_OBJECT_SPACE		0x40000
+#define YAFFS_MAX_OBJECT_ID		(YAFFS_OBJECT_SPACE - 1)
 
-#define YAFFS_CHECKPOINT_VERSION 	3
+/* Binary data version stamps */
+#define YAFFS_SUMMARY_VERSION		1
+#define YAFFS_CHECKPOINT_VERSION	6
 
 #ifdef CONFIG_YAFFS_UNICODE
 #define YAFFS_MAX_NAME_LENGTH		127
@@ -81,16 +95,16 @@
 #define YAFFS_OBJECTID_UNLINKED		3
 #define YAFFS_OBJECTID_DELETED		4
 
-/* Sseudo object ids for checkpointing */
-#define YAFFS_OBJECTID_SB_HEADER	0x10
-#define YAFFS_OBJECTID_CHECKPOINT_DATA	0x20
-#define YAFFS_SEQUENCE_CHECKPOINT_DATA  0x21
+/* Fake object Id for summary data */
+#define YAFFS_OBJECTID_SUMMARY		0x10
 
-/* */
+/* Pseudo object ids for checkpointing */
+#define YAFFS_OBJECTID_CHECKPOINT_DATA	0x20
+#define YAFFS_SEQUENCE_CHECKPOINT_DATA	0x21
 
 #define YAFFS_MAX_SHORT_OP_CACHES	20
 
-#define YAFFS_N_TEMP_BUFFERS		4
+#define YAFFS_N_TEMP_BUFFERS		6
 
 /* We limit the number attempts at sucessfully saving a chunk of data.
  * Small-page devices have 32 pages per block; large-page devices have 64.
@@ -102,142 +116,136 @@
  * The range is limited slightly to help distinguish bad numbers from good.
  * This also allows us to perhaps in the future use special numbers for
  * special purposes.
- * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
+ * EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years,
  * and is a larger number than the lifetime of a 2GB device.
  */
 #define YAFFS_LOWEST_SEQUENCE_NUMBER	0x00001000
-#define YAFFS_HIGHEST_SEQUENCE_NUMBER	0xEFFFFF00
+#define YAFFS_HIGHEST_SEQUENCE_NUMBER	0xefffff00
+
+/* Special sequence number for bad block that failed to be marked bad */
+#define YAFFS_SEQUENCE_BAD_BLOCK	0xffff0000
 
 /* ChunkCache is used for short read/write operations.*/
-typedef struct {
-	struct yaffs_ObjectStruct *object;
-	int chunkId;
-	int lastUse;
+struct yaffs_cache {
+	struct yaffs_obj *object;
+	int chunk_id;
+	int last_use;
 	int dirty;
-	int nBytes;		/* Only valid if the cache is dirty */
+	int n_bytes;		/* Only valid if the cache is dirty */
 	int locked;		/* Can't push out or flush while locked. */
-#ifdef CONFIG_YAFFS_YAFFS2
-	__u8 *data;
-#else
-	__u8 data[YAFFS_BYTES_PER_CHUNK];
-#endif
-} yaffs_ChunkCache;
-
-
+	u8 *data;
+};
 
-/* Tags structures in RAM
- * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
- * the structure size will get blown out.
+/* yaffs1 tags structures in RAM
+ * NB This uses bitfield. Bitfields should not straddle a u32 boundary
+ * otherwise the structure size will get blown out.
  */
 
-#ifndef CONFIG_YAFFS_NO_YAFFS1
-typedef struct {
-	unsigned chunkId:20;
-	unsigned serialNumber:2;
-	unsigned byteCount:10;
-	unsigned objectId:18;
+struct yaffs_tags {
+	unsigned chunk_id:20;
+	unsigned serial_number:2;
+	unsigned n_bytes_lsb:10;
+	unsigned obj_id:18;
 	unsigned ecc:12;
-	unsigned unusedStuff:2;
-
-} yaffs_Tags;
+	unsigned n_bytes_msb:2;
+};
 
-typedef union {
-	yaffs_Tags asTags;
-	__u8 asBytes[8];
-} yaffs_TagsUnion;
+union yaffs_tags_union {
+	struct yaffs_tags as_tags;
+	u8 as_bytes[8];
+};
 
-#endif
 
 /* Stuff used for extended tags in YAFFS2 */
 
-typedef enum {
+enum yaffs_ecc_result {
 	YAFFS_ECC_RESULT_UNKNOWN,
 	YAFFS_ECC_RESULT_NO_ERROR,
 	YAFFS_ECC_RESULT_FIXED,
 	YAFFS_ECC_RESULT_UNFIXED
-} yaffs_ECCResult;
+};
 
-typedef enum {
+enum yaffs_obj_type {
 	YAFFS_OBJECT_TYPE_UNKNOWN,
 	YAFFS_OBJECT_TYPE_FILE,
 	YAFFS_OBJECT_TYPE_SYMLINK,
 	YAFFS_OBJECT_TYPE_DIRECTORY,
 	YAFFS_OBJECT_TYPE_HARDLINK,
 	YAFFS_OBJECT_TYPE_SPECIAL
-} yaffs_ObjectType;
+};
 
 #define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
 
-typedef struct {
-
-	unsigned validMarker0;
-	unsigned chunkUsed;	/*  Status of the chunk: used or unused */
-	unsigned objectId;	/* If 0 then this is not part of an object (unused) */
-	unsigned chunkId;	/* If 0 then this is a header, else a data chunk */
-	unsigned byteCount;	/* Only valid for data chunks */
+struct yaffs_ext_tags {
+	unsigned chunk_used;	/*  Status of the chunk: used or unused */
+	unsigned obj_id;	/* If 0 this is not used */
+	unsigned chunk_id;	/* If 0 this is a header, else a data chunk */
+	unsigned n_bytes;	/* Only valid for data chunks */
 
 	/* The following stuff only has meaning when we read */
-	yaffs_ECCResult eccResult;
-	unsigned blockBad;
+	enum yaffs_ecc_result ecc_result;
+	unsigned block_bad;
 
 	/* YAFFS 1 stuff */
-	unsigned chunkDeleted;	/* The chunk is marked deleted */
-	unsigned serialNumber;	/* Yaffs1 2-bit serial number */
+	unsigned is_deleted;	/* The chunk is marked deleted */
+	unsigned serial_number;	/* Yaffs1 2-bit serial number */
 
 	/* YAFFS2 stuff */
-	unsigned sequenceNumber;	/* The sequence number of this block */
+	unsigned seq_number;	/* The sequence number of this block */
 
 	/* Extra info if this is an object header (YAFFS2 only) */
 
-	unsigned extraHeaderInfoAvailable;	/* There is extra info available if this is not zero */
-	unsigned extraParentObjectId;	/* The parent object */
-	unsigned extraIsShrinkHeader;	/* Is it a shrink header? */
-	unsigned extraShadows;		/* Does this shadow another object? */
-
-	yaffs_ObjectType extraObjectType;	/* What object type? */
+	unsigned extra_available;	/* Extra info available if not zero */
+	unsigned extra_parent_id;	/* The parent object */
+	unsigned extra_is_shrink;	/* Is it a shrink header? */
+	unsigned extra_shadows;	/* Does this shadow another object? */
 
-	unsigned extraFileLength;		/* Length if it is a file */
-	unsigned extraEquivalentObjectId;	/* Equivalent object Id if it is a hard link */
+	enum yaffs_obj_type extra_obj_type;	/* What object type? */
 
-	unsigned validMarker1;
-
-} yaffs_ExtendedTags;
+	loff_t extra_file_size;		/* Length if it is a file */
+	unsigned extra_equiv_id;	/* Equivalent object for a hard link */
+};
 
 /* Spare structure for YAFFS1 */
-typedef struct {
-	__u8 tagByte0;
-	__u8 tagByte1;
-	__u8 tagByte2;
-	__u8 tagByte3;
-	__u8 pageStatus;	/* set to 0 to delete the chunk */
-	__u8 blockStatus;
-	__u8 tagByte4;
-	__u8 tagByte5;
-	__u8 ecc1[3];
-	__u8 tagByte6;
-	__u8 tagByte7;
-	__u8 ecc2[3];
-} yaffs_Spare;
+struct yaffs_spare {
+	u8 tb0;
+	u8 tb1;
+	u8 tb2;
+	u8 tb3;
+	u8 page_status;		/* set to 0 to delete the chunk */
+	u8 block_status;
+	u8 tb4;
+	u8 tb5;
+	u8 ecc1[3];
+	u8 tb6;
+	u8 tb7;
+	u8 ecc2[3];
+};
 
 /*Special structure for passing through to mtd */
-struct yaffs_NANDSpare {
-	yaffs_Spare spare;
+struct yaffs_nand_spare {
+	struct yaffs_spare spare;
 	int eccres1;
 	int eccres2;
 };
 
 /* Block data in RAM */
 
-typedef enum {
+enum yaffs_block_state {
 	YAFFS_BLOCK_STATE_UNKNOWN = 0,
 
 	YAFFS_BLOCK_STATE_SCANNING,
-	YAFFS_BLOCK_STATE_NEEDS_SCANNING,
-	/* The block might have something on it (ie it is allocating or full, perhaps empty)
-	 * but it needs to be scanned to determine its true state.
-	 * This state is only valid during yaffs_Scan.
-	 * NB We tolerate empty because the pre-scanner might be incapable of deciding
-	 * However, if this state is returned on a YAFFS2 device, then we expect a sequence number
+	/* Being scanned */
+
+	YAFFS_BLOCK_STATE_NEEDS_SCAN,
+	/* The block might have something on it (ie it is allocating or full,
+	 * perhaps empty) but it needs to be scanned to determine its true
+	 * state.
+	 * This state is only valid during scanning.
+	 * NB We tolerate empty because the pre-scanner might be incapable of
+	 * deciding
+	 * However, if this state is returned on a YAFFS2 device,
+	 * then we expect a sequence number
 	 */
 
 	YAFFS_BLOCK_STATE_EMPTY,
@@ -247,123 +255,109 @@ typedef enum {
 	/* This block is partially allocated.
 	 * At least one page holds valid data.
 	 * This is the one currently being used for page
-	 * allocation. Should never be more than one of these
+	 * allocation. Should never be more than one of these.
+	 * If a block is only partially allocated at mount it is treated as
+	 * full.
 	 */
 
 	YAFFS_BLOCK_STATE_FULL,
 	/* All the pages in this block have been allocated.
+	 * If a block was only partially allocated when mounted we treat
+	 * it as fully allocated.
 	 */
 
 	YAFFS_BLOCK_STATE_DIRTY,
-	/* All pages have been allocated and deleted.
+	/* The block was full and now all chunks have been deleted.
 	 * Erase me, reuse me.
 	 */
 
 	YAFFS_BLOCK_STATE_CHECKPOINT,
-	/* This block is assigned to holding checkpoint data.
-	 */
+	/* This block is assigned to holding checkpoint data. */
 
 	YAFFS_BLOCK_STATE_COLLECTING,
 	/* This block is being garbage collected */
 
 	YAFFS_BLOCK_STATE_DEAD
-	/* This block has failed and is not in use */
-} yaffs_BlockState;
+	    /* This block has failed and is not in use */
+};
 
 #define	YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
 
+struct yaffs_block_info {
+
+	int soft_del_pages:10;	/* number of soft deleted pages */
+	int pages_in_use:10;	/* number of pages in use */
+	unsigned block_state:4;	/* One of the above block states. */
+				/* NB use unsigned because enum is sometimes
+				 * an int */
+	u32 needs_retiring:1;	/* Data has failed on this block, */
+				/*need to get valid data off and retire*/
+	u32 skip_erased_check:1;/* Skip the erased check on this block */
+	u32 gc_prioritise:1;	/* An ECC check or blank check has failed.
+				   Block should be prioritised for GC */
+	u32 chunk_error_strikes:3;	/* How many times we've had ecc etc
+				failures on this block and tried to reuse it */
+	u32 has_summary:1;	/* The block has a summary */
+
+	u32 has_shrink_hdr:1;	/* This block has at least one shrink header */
+	u32 seq_number;		/* block sequence number for yaffs2 */
 
-typedef struct {
-
-	int softDeletions:10;	/* number of soft deleted pages */
-	int pagesInUse:10;	/* number of pages in use */
-	unsigned blockState:4;	/* One of the above block states. NB use unsigned because enum is sometimes an int */
-	__u32 needsRetiring:1;	/* Data has failed on this block, need to get valid data off */
-				/* and retire the block. */
-	__u32 skipErasedCheck: 1; /* If this is set we can skip the erased check on this block */
-	__u32 gcPrioritise: 1; 	/* An ECC check or blank check has failed on this block.
-				   It should be prioritised for GC */
-	__u32 chunkErrorStrikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
-
-#ifdef CONFIG_YAFFS_YAFFS2
-	__u32 hasShrinkHeader:1; /* This block has at least one shrink object header */
-	__u32 sequenceNumber;	 /* block sequence number for yaffs2 */
-#endif
-
-} yaffs_BlockInfo;
+};
 
 /* -------------------------- Object structure -------------------------------*/
 /* This is the object structure as stored on NAND */
 
-typedef struct {
-	yaffs_ObjectType type;
+struct yaffs_obj_hdr {
+	enum yaffs_obj_type type;
 
 	/* Apply to everything  */
-	int parentObjectId;
-	__u16 sum__NoLongerUsed;	/* checksum of name. No longer used */
+	int parent_obj_id;
+	u16 sum_no_longer_used;	/* checksum of name. No longer used */
 	YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
 
-	/* Thes following apply to directories, files, symlinks - not hard links */
-	__u32 yst_mode;		/* protection */
+	/* The following apply to all object types except for hard links */
+	u32 yst_mode;		/* protection */
 
-#ifdef CONFIG_YAFFS_WINCE
-	__u32 notForWinCE[5];
-#else
-	__u32 yst_uid;
-	__u32 yst_gid;
-	__u32 yst_atime;
-	__u32 yst_mtime;
-	__u32 yst_ctime;
-#endif
+	u32 yst_uid;
+	u32 yst_gid;
+	u32 yst_atime;
+	u32 yst_mtime;
+	u32 yst_ctime;
 
 	/* File size  applies to files only */
-	int fileSize;
+	u32 file_size_low;
 
 	/* Equivalent object id applies to hard links only. */
-	int equivalentObjectId;
+	int equiv_id;
 
 	/* Alias is for symlinks only. */
 	YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
 
-	__u32 yst_rdev;		/* device stuff for block and char devices (major/min) */
+	u32 yst_rdev;	/* stuff for block and char devices (major/min) */
 
-#ifdef CONFIG_YAFFS_WINCE
-	__u32 win_ctime[2];
-	__u32 win_atime[2];
-	__u32 win_mtime[2];
-	__u32 roomToGrow[4];
-#else
-	__u32 roomToGrow[10];
-#endif
-
-	int shadowsObject;	/* This object header shadows the specified object if > 0 */
+	u32 win_ctime[2];
+	u32 win_atime[2];
+	u32 win_mtime[2];
 
-	/* isShrink applies to object headers written when we shrink the file (ie resize) */
-	__u32 isShrink;
+	u32 inband_shadowed_obj_id;
+	u32 inband_is_shrink;
 
-} yaffs_ObjectHeader;
+	u32 file_size_high;
+	u32 reserved[1];
+	int shadows_obj;	/* This object header shadows the
+				specified object if > 0 */
 
-/*--------------------------- Tnode -------------------------- */
-
-union yaffs_Tnode_union {
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1];
-#else
-	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
-#endif
-/*	__u16 level0[YAFFS_NTNODES_LEVEL0]; */
+	/* is_shrink applies to object headers written when wemake a hole. */
+	u32 is_shrink;
 
 };
 
-typedef union yaffs_Tnode_union yaffs_Tnode;
+/*--------------------------- Tnode -------------------------- */
 
-struct yaffs_TnodeList_struct {
-	struct yaffs_TnodeList_struct *next;
-	yaffs_Tnode *tnodes;
+struct yaffs_tnode {
+	struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
 };
 
-typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
-
 /*------------------------  Object -----------------------------*/
 /* An object can be one of:
  * - a directory (no data, has children links
@@ -372,537 +366,608 @@ typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
  * - a hard link
  */
 
-typedef struct {
-	__u32 fileSize;
-	__u32 scannedFileSize;
-	__u32 shrinkSize;
-	int topLevel;
-	yaffs_Tnode *top;
-} yaffs_FileStructure;
+struct yaffs_file_var {
+	loff_t file_size;
+	loff_t scanned_size;
+	loff_t shrink_size;
+	int top_level;
+	struct yaffs_tnode *top;
+};
 
-typedef struct {
+struct yaffs_dir_var {
 	struct list_head children;	/* list of child links */
-} yaffs_DirectoryStructure;
+	struct list_head dirty;	/* Entry for list of dirty directories */
+};
 
-typedef struct {
+struct yaffs_symlink_var {
 	YCHAR *alias;
-} yaffs_SymLinkStructure;
-
-typedef struct {
-	struct yaffs_ObjectStruct *equivalentObject;
-	__u32 equivalentObjectId;
-} yaffs_HardLinkStructure;
-
-typedef union {
-	yaffs_FileStructure fileVariant;
-	yaffs_DirectoryStructure directoryVariant;
-	yaffs_SymLinkStructure symLinkVariant;
-	yaffs_HardLinkStructure hardLinkVariant;
-} yaffs_ObjectVariant;
-
-struct yaffs_ObjectStruct {
-	__u8 deleted:1;		/* This should only apply to unlinked files. */
-	__u8 softDeleted:1;	/* it has also been soft deleted */
-	__u8 unlinked:1;	/* An unlinked file. The file should be in the unlinked directory.*/
-	__u8 fake:1;		/* A fake object has no presence on NAND. */
-	__u8 renameAllowed:1;	/* Some objects are not allowed to be renamed. */
-	__u8 unlinkAllowed:1;
-	__u8 dirty:1;		/* the object needs to be written to flash */
-	__u8 valid:1;		/* When the file system is being loaded up, this
+};
+
+struct yaffs_hardlink_var {
+	struct yaffs_obj *equiv_obj;
+	u32 equiv_id;
+};
+
+union yaffs_obj_var {
+	struct yaffs_file_var file_variant;
+	struct yaffs_dir_var dir_variant;
+	struct yaffs_symlink_var symlink_variant;
+	struct yaffs_hardlink_var hardlink_variant;
+};
+
+struct yaffs_obj {
+	u8 deleted:1;		/* This should only apply to unlinked files. */
+	u8 soft_del:1;		/* it has also been soft deleted */
+	u8 unlinked:1;		/* An unlinked file.*/
+	u8 fake:1;		/* A fake object has no presence on NAND. */
+	u8 rename_allowed:1;	/* Some objects cannot be renamed. */
+	u8 unlink_allowed:1;
+	u8 dirty:1;		/* the object needs to be written to flash */
+	u8 valid:1;		/* When the file system is being loaded up, this
 				 * object might be created before the data
-				 * is available (ie. file data records appear before the header).
+				 * is available
+				 * ie. file data chunks encountered before
+				* the header.
 				 */
-	__u8 lazyLoaded:1;	/* This object has been lazy loaded and is missing some detail */
+	u8 lazy_loaded:1;	/* This object has been lazy loaded and
+				 * is missing some detail */
 
-	__u8 deferedFree:1;	/* For Linux kernel. Object is removed from NAND, but is
-				 * still in the inode cache. Free of object is defered.
+	u8 defered_free:1;	/* Object is removed from NAND, but is
+				 * still in the inode cache.
+				 * Free of object is defered.
 				 * until the inode is released.
 				 */
+	u8 being_created:1;	/* This object is still being created
+				 * so skip some verification checks. */
+	u8 is_shadowed:1;	/* This object is shadowed on the way
+				 * to being renamed. */
 
-	__u8 serial;		/* serial number of chunk in NAND. Cached here */
-	__u16 sum;		/* sum of the name to speed searching */
+	u8 xattr_known:1;	/* We know if this has object has xattribs
+				 * or not. */
+	u8 has_xattr:1;		/* This object has xattribs.
+				 * Only valid if xattr_known. */
 
-	struct yaffs_DeviceStruct *myDev;	/* The device I'm on */
+	u8 serial;		/* serial number of chunk in NAND.*/
+	u16 sum;		/* sum of the name to speed searching */
 
-	struct list_head hashLink;	/* list of objects in this hash bucket */
+	struct yaffs_dev *my_dev;	/* The device I'm on */
 
-	struct list_head hardLinks;	/* all the equivalent hard linked objects */
+	struct list_head hash_link;	/* list of objects in hash bucket */
+
+	struct list_head hard_links;	/* hard linked object chain*/
 
 	/* directory structure stuff */
 	/* also used for linking up the free list */
-	struct yaffs_ObjectStruct *parent;
+	struct yaffs_obj *parent;
 	struct list_head siblings;
 
 	/* Where's my object header in NAND? */
-	int chunkId;
+	int hdr_chunk;
 
-	int nDataChunks;	/* Number of data chunks attached to the file. */
+	int n_data_chunks;	/* Number of data chunks for this file. */
 
-	__u32 objectId;		/* the object id value */
+	u32 obj_id;		/* the object id value */
 
-	__u32 yst_mode;
+	u32 yst_mode;
 
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-	YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1];
-#endif
-
-/* XXX U-BOOT XXX */
-/* #ifndef __KERNEL__ */
-	__u32 inUse;
-/* #endif */
+	YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
 
 #ifdef CONFIG_YAFFS_WINCE
-	__u32 win_ctime[2];
-	__u32 win_mtime[2];
-	__u32 win_atime[2];
+	u32 win_ctime[2];
+	u32 win_mtime[2];
+	u32 win_atime[2];
 #else
-	__u32 yst_uid;
-	__u32 yst_gid;
-	__u32 yst_atime;
-	__u32 yst_mtime;
-	__u32 yst_ctime;
+	u32 yst_uid;
+	u32 yst_gid;
+	u32 yst_atime;
+	u32 yst_mtime;
+	u32 yst_ctime;
 #endif
 
-	__u32 yst_rdev;
+	u32 yst_rdev;
 
-/* XXX U-BOOT XXX */
-/* #ifndef __KERNEL__ */
-	struct inode *myInode;
-/* #endif */
+	void *my_inode;
 
-	yaffs_ObjectType variantType;
+	enum yaffs_obj_type variant_type;
 
-	yaffs_ObjectVariant variant;
+	union yaffs_obj_var variant;
 
 };
 
-typedef struct yaffs_ObjectStruct yaffs_Object;
-
-struct yaffs_ObjectList_struct {
-	yaffs_Object *objects;
-	struct yaffs_ObjectList_struct *next;
-};
-
-typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
-
-typedef struct {
+struct yaffs_obj_bucket {
 	struct list_head list;
 	int count;
-} yaffs_ObjectBucket;
-
+};
 
-/* yaffs_CheckpointObject holds the definition of an object as dumped
+/* yaffs_checkpt_obj holds the definition of an object as dumped
  * by checkpointing.
  */
 
-typedef struct {
-	int structType;
-	__u32 objectId;
-	__u32 parentId;
-	int chunkId;
-
-	yaffs_ObjectType variantType:3;
-	__u8 deleted:1;
-	__u8 softDeleted:1;
-	__u8 unlinked:1;
-	__u8 fake:1;
-	__u8 renameAllowed:1;
-	__u8 unlinkAllowed:1;
-	__u8 serial;
-
-	int nDataChunks;
-	__u32 fileSizeOrEquivalentObjectId;
-
-}yaffs_CheckpointObject;
+struct yaffs_checkpt_obj {
+	int struct_type;
+	u32 obj_id;
+	u32 parent_id;
+	int hdr_chunk;
+	enum yaffs_obj_type variant_type:3;
+	u8 deleted:1;
+	u8 soft_del:1;
+	u8 unlinked:1;
+	u8 fake:1;
+	u8 rename_allowed:1;
+	u8 unlink_allowed:1;
+	u8 serial;
+	int n_data_chunks;
+	loff_t size_or_equiv_obj;
+};
 
 /*--------------------- Temporary buffers ----------------
  *
- * These are chunk-sized working buffers. Each device has a few
+ * These are chunk-sized working buffers. Each device has a few.
  */
 
-typedef struct {
-	__u8 *buffer;
-	int line;	/* track from whence this buffer was allocated */
-	int maxLine;
-} yaffs_TempBuffer;
+struct yaffs_buffer {
+	u8 *buffer;
+	int in_use;
+};
 
 /*----------------- Device ---------------------------------*/
 
-struct yaffs_DeviceStruct {
-	struct list_head devList;
-	const char *name;
-
-	/* Entry parameters set up way early. Yaffs sets up the rest.*/
-	int nDataBytesPerChunk;	/* Should be a power of 2 >= 512 */
-	int nChunksPerBlock;	/* does not need to be a power of 2 */
-	int nBytesPerSpare;	/* spare area size */
-	int startBlock;		/* Start block we're allowed to use */
-	int endBlock;		/* End block we're allowed to use */
-	int nReservedBlocks;	/* We want this tuneable so that we can reduce */
-				/* reserved blocks on NOR and RAM. */
-
-
-	/* Stuff used by the shared space checkpointing mechanism */
-	/* If this value is zero, then this mechanism is disabled */
-
-	int nCheckpointReservedBlocks; /* Blocks to reserve for checkpoint data */
-
-
+struct yaffs_param {
+	const YCHAR *name;
 
+	/*
+	 * Entry parameters set up way early. Yaffs sets up the rest.
+	 * The structure should be zeroed out before use so that unused
+	 * and defualt values are zero.
+	 */
 
-	int nShortOpCaches;	/* If <= 0, then short op caching is disabled, else
-				 * the number of short op caches (don't use too many)
+	int inband_tags;	/* Use unband tags */
+	u32 total_bytes_per_chunk;	/* Should be >= 512, does not need to
+					 be a power of 2 */
+	int chunks_per_block;	/* does not need to be a power of 2 */
+	int spare_bytes_per_chunk;	/* spare area size */
+	int start_block;	/* Start block we're allowed to use */
+	int end_block;		/* End block we're allowed to use */
+	int n_reserved_blocks;	/* Tuneable so that we can reduce
+				 * reserved blocks on NOR and RAM. */
+
+	int n_caches;		/* If <= 0, then short op caching is disabled,
+				 * else the number of short op caches.
 				 */
+	int use_nand_ecc;	/* Flag to decide whether or not to use
+				 * NAND driver ECC on data (yaffs1) */
+	int tags_9bytes;	/* Use 9 byte tags */
+	int no_tags_ecc;	/* Flag to decide whether or not to do ECC
+				 * on packed tags (yaffs2) */
 
-	int useHeaderFileSize;	/* Flag to determine if we should use file sizes from the header */
-
-	int useNANDECC;		/* Flag to decide whether or not to use NANDECC */
+	int is_yaffs2;		/* Use yaffs2 mode on this device */
 
-	void *genericDevice;	/* Pointer to device context
-				 * On an mtd this holds the mtd pointer.
-				 */
-	void *superBlock;
-
-	/* NAND access functions (Must be set before calling YAFFS)*/
-
-	int (*writeChunkToNAND) (struct yaffs_DeviceStruct * dev,
-				 int chunkInNAND, const __u8 * data,
-				 const yaffs_Spare * spare);
-	int (*readChunkFromNAND) (struct yaffs_DeviceStruct * dev,
-				  int chunkInNAND, __u8 * data,
-				  yaffs_Spare * spare);
-	int (*eraseBlockInNAND) (struct yaffs_DeviceStruct * dev,
-				 int blockInNAND);
-	int (*initialiseNAND) (struct yaffs_DeviceStruct * dev);
-
-#ifdef CONFIG_YAFFS_YAFFS2
-	int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct * dev,
-					 int chunkInNAND, const __u8 * data,
-					 const yaffs_ExtendedTags * tags);
-	int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct * dev,
-					  int chunkInNAND, __u8 * data,
-					  yaffs_ExtendedTags * tags);
-	int (*markNANDBlockBad) (struct yaffs_DeviceStruct * dev, int blockNo);
-	int (*queryNANDBlock) (struct yaffs_DeviceStruct * dev, int blockNo,
-			       yaffs_BlockState * state, int *sequenceNumber);
-#endif
+	int empty_lost_n_found;	/* Auto-empty lost+found directory on mount */
 
-	int isYaffs2;
+	int refresh_period;	/* How often to check for a block refresh */
 
-	/* The removeObjectCallback function must be supplied by OS flavours that
-	 * need it. The Linux kernel does not use this, but yaffs direct does use
-	 * it to implement the faster readdir
+	/* Checkpoint control. Can be set before or after initialisation */
+	u8 skip_checkpt_rd;
+	u8 skip_checkpt_wr;
+
+	int enable_xattr;	/* Enable xattribs */
+
+	/* NAND access functions (Must be set before calling YAFFS) */
+
+	int (*write_chunk_fn) (struct yaffs_dev *dev,
+			       int nand_chunk, const u8 *data,
+			       const struct yaffs_spare *spare);
+	int (*read_chunk_fn) (struct yaffs_dev *dev,
+			      int nand_chunk, u8 *data,
+			      struct yaffs_spare *spare);
+	int (*erase_fn) (struct yaffs_dev *dev, int flash_block);
+	int (*initialise_flash_fn) (struct yaffs_dev *dev);
+	int (*deinitialise_flash_fn) (struct yaffs_dev *dev);
+
+	/* yaffs2 mode functions */
+	int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
+				    int nand_chunk, const u8 *data,
+				    const struct yaffs_ext_tags *tags);
+	int (*read_chunk_tags_fn) (struct yaffs_dev *dev,
+				   int nand_chunk, u8 *data,
+				   struct yaffs_ext_tags *tags);
+	int (*bad_block_fn) (struct yaffs_dev *dev, int block_no);
+	int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
+			       enum yaffs_block_state *state,
+			       u32 *seq_number);
+
+	/* The remove_obj_fn function must be supplied by OS flavours that
+	 * need it.
+	 * yaffs direct uses it to implement the faster readdir.
+	 * Linux uses it to protect the directory during unlocking.
 	 */
-	void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj);
+	void (*remove_obj_fn) (struct yaffs_obj *obj);
 
-	/* Callback to mark the superblock dirsty */
-	void (*markSuperBlockDirty)(void * superblock);
+	/* Callback to mark the superblock dirty */
+	void (*sb_dirty_fn) (struct yaffs_dev *dev);
 
-	int wideTnodesDisabled; /* Set to disable wide tnodes */
+	/*  Callback to control garbage collection. */
+	unsigned (*gc_control) (struct yaffs_dev *dev);
 
+	/* Debug control flags. Don't use unless you know what you're doing */
+	int use_header_file_size;	/* Flag to determine if we should use
+					 * file sizes from the header */
+	int disable_lazy_load;	/* Disable lazy loading on this device */
+	int wide_tnodes_disabled;	/* Set to disable wide tnodes */
+	int disable_soft_del;	/* yaffs 1 only: Set to disable the use of
+				 * softdeletion. */
 
-	/* End of stuff that must be set before initialisation. */
+	int defered_dir_update;	/* Set to defer directory updates */
 
-	/* Checkpoint control. Can be set before or after initialisation */
-	__u8 skipCheckpointRead;
-	__u8 skipCheckpointWrite;
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	int auto_unicode;
+#endif
+	int always_check_erased;	/* Force chunk erased check always on */
 
-	/* Runtime parameters. Set up by YAFFS. */
+	int disable_summary;
 
-	__u16 chunkGroupBits;	/* 0 for devices <= 32MB. else log2(nchunks) - 16 */
-	__u16 chunkGroupSize;	/* == 2^^chunkGroupBits */
+	int max_objects;	/*
+				 * Set to limit the number of objects created.
+				 * 0 = no limit.
+				*/
+};
 
-	/* Stuff to support wide tnodes */
-	__u32 tnodeWidth;
-	__u32 tnodeMask;
+struct yaffs_dev {
+	struct yaffs_param param;
 
-	/* Stuff to support various file offses to chunk/offset translations */
-	/* "Crumbs" for nDataBytesPerChunk not being a power of 2 */
-	__u32 crumbMask;
-	__u32 crumbShift;
-	__u32 crumbsPerChunk;
+	/* Context storage. Holds extra OS specific data for this device */
 
-	/* Straight shifting for nDataBytesPerChunk being a power of 2 */
-	__u32 chunkShift;
-	__u32 chunkMask;
+	void *os_context;
+	void *driver_context;
 
+	struct list_head dev_list;
 
-/* XXX U-BOOT XXX */
-#if 0
-#ifndef __KERNEL__
+	/* Runtime parameters. Set up by YAFFS. */
+	int data_bytes_per_chunk;
 
-	struct semaphore sem;	/* Semaphore for waiting on erasure.*/
-	struct semaphore grossLock;	/* Gross locking semaphore */
-	void (*putSuperFunc) (struct super_block * sb);
-#endif
-#endif
-	__u8 *spareBuffer;	/* For mtdif2 use. Don't know the size of the buffer
-				 * at compile time so we have to allocate it.
+	/* Non-wide tnode stuff */
+	u16 chunk_grp_bits;	/* Number of bits that need to be resolved if
+				 * the tnodes are not wide enough.
 				 */
+	u16 chunk_grp_size;	/* == 2^^chunk_grp_bits */
 
-	int isMounted;
+	/* Stuff to support wide tnodes */
+	u32 tnode_width;
+	u32 tnode_mask;
+	u32 tnode_size;
 
-	int isCheckpointed;
+	/* Stuff for figuring out file offset to chunk conversions */
+	u32 chunk_shift;	/* Shift value */
+	u32 chunk_div;		/* Divisor after shifting: 1 for 2^n sizes */
+	u32 chunk_mask;		/* Mask to use for power-of-2 case */
 
+	int is_mounted;
+	int read_only;
+	int is_checkpointed;
 
 	/* Stuff to support block offsetting to support start block zero */
-	int internalStartBlock;
-	int internalEndBlock;
-	int blockOffset;
-	int chunkOffset;
-
+	int internal_start_block;
+	int internal_end_block;
+	int block_offset;
+	int chunk_offset;
 
 	/* Runtime checkpointing stuff */
-	int checkpointPageSequence;   /* running sequence number of checkpoint pages */
-	int checkpointByteCount;
-	int checkpointByteOffset;
-	__u8 *checkpointBuffer;
-	int checkpointOpenForWrite;
-	int blocksInCheckpoint;
-	int checkpointCurrentChunk;
-	int checkpointCurrentBlock;
-	int checkpointNextBlock;
-	int *checkpointBlockList;
-	int checkpointMaxBlocks;
-	__u32 checkpointSum;
-	__u32 checkpointXor;
+	int checkpt_page_seq;	/* running sequence number of checkpt pages */
+	int checkpt_byte_count;
+	int checkpt_byte_offs;
+	u8 *checkpt_buffer;
+	int checkpt_open_write;
+	int blocks_in_checkpt;
+	int checkpt_cur_chunk;
+	int checkpt_cur_block;
+	int checkpt_next_block;
+	int *checkpt_block_list;
+	int checkpt_max_blocks;
+	u32 checkpt_sum;
+	u32 checkpt_xor;
+
+	int checkpoint_blocks_required;	/* Number of blocks needed to store
+					 * current checkpoint set */
 
 	/* Block Info */
-	yaffs_BlockInfo *blockInfo;
-	__u8 *chunkBits;	/* bitmap of chunks in use */
-	unsigned blockInfoAlt:1;	/* was allocated using alternative strategy */
-	unsigned chunkBitsAlt:1;	/* was allocated using alternative strategy */
-	int chunkBitmapStride;	/* Number of bytes of chunkBits per block.
-				 * Must be consistent with nChunksPerBlock.
+	struct yaffs_block_info *block_info;
+	u8 *chunk_bits;		/* bitmap of chunks in use */
+	unsigned block_info_alt:1;	/* allocated using alternative alloc */
+	unsigned chunk_bits_alt:1;	/* allocated using alternative alloc */
+	int chunk_bit_stride;	/* Number of bytes of chunk_bits per block.
+				 * Must be consistent with chunks_per_block.
 				 */
 
-	int nErasedBlocks;
-	int allocationBlock;	/* Current block being allocated off */
-	__u32 allocationPage;
-	int allocationBlockFinder;	/* Used to search for next allocation block */
-
-	/* Runtime state */
-	int nTnodesCreated;
-	yaffs_Tnode *freeTnodes;
-	int nFreeTnodes;
-	yaffs_TnodeList *allocatedTnodeList;
-
-	int isDoingGC;
-
-	int nObjectsCreated;
-	yaffs_Object *freeObjects;
-	int nFreeObjects;
+	int n_erased_blocks;
+	int alloc_block;	/* Current block being allocated off */
+	u32 alloc_page;
+	int alloc_block_finder;	/* Used to search for next allocation block */
 
-	yaffs_ObjectList *allocatedObjectList;
+	/* Object and Tnode memory management */
+	void *allocator;
+	int n_obj;
+	int n_tnodes;
 
-	yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
+	int n_hardlinks;
 
-	int nFreeChunks;
+	struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
+	u32 bucket_finder;
 
-	int currentDirtyChecker;	/* Used to find current dirtiest block */
+	int n_free_chunks;
 
-	__u32 *gcCleanupList;	/* objects to delete at the end of a GC. */
-	int nonAggressiveSkip;	/* GC state/mode */
+	/* Garbage collection control */
+	u32 *gc_cleanup_list;	/* objects to delete at the end of a GC. */
+	u32 n_clean_ups;
 
-	/* Statistcs */
-	int nPageWrites;
-	int nPageReads;
-	int nBlockErasures;
-	int nErasureFailures;
-	int nGCCopies;
-	int garbageCollections;
-	int passiveGarbageCollections;
-	int nRetriedWrites;
-	int nRetiredBlocks;
-	int eccFixed;
-	int eccUnfixed;
-	int tagsEccFixed;
-	int tagsEccUnfixed;
-	int nDeletions;
-	int nUnmarkedDeletions;
-
-	int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
+	unsigned has_pending_prioritised_gc;	/* We think this device might
+						have pending prioritised gcs */
+	unsigned gc_disable;
+	unsigned gc_block_finder;
+	unsigned gc_dirtiest;
+	unsigned gc_pages_in_use;
+	unsigned gc_not_done;
+	unsigned gc_block;
+	unsigned gc_chunk;
+	unsigned gc_skip;
+	struct yaffs_summary_tags *gc_sum_tags;
 
 	/* Special directories */
-	yaffs_Object *rootDir;
-	yaffs_Object *lostNFoundDir;
-
-	/* Buffer areas for storing data to recover from write failures TODO
-	 *      __u8            bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
-	 *      yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];
-	 */
-
-	int bufferedBlock;	/* Which block is buffered here? */
-	int doingBufferedBlockRewrite;
+	struct yaffs_obj *root_dir;
+	struct yaffs_obj *lost_n_found;
+
+	int buffered_block;	/* Which block is buffered here? */
+	int doing_buffered_block_rewrite;
+
+	struct yaffs_cache *cache;
+	int cache_last_use;
+
+	/* Stuff for background deletion and unlinked files. */
+	struct yaffs_obj *unlinked_dir;	/* Directory where unlinked and deleted
+					 files live. */
+	struct yaffs_obj *del_dir;	/* Directory where deleted objects are
+					sent to disappear. */
+	struct yaffs_obj *unlinked_deletion;	/* Current file being
+							background deleted. */
+	int n_deleted_files;	/* Count of files awaiting deletion; */
+	int n_unlinked_files;	/* Count of unlinked files. */
+	int n_bg_deletions;	/* Count of background deletions. */
+
+	/* Temporary buffer management */
+	struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
+	int max_temp;
+	int temp_in_use;
+	int unmanaged_buffer_allocs;
+	int unmanaged_buffer_deallocs;
 
-	yaffs_ChunkCache *srCache;
-	int srLastUse;
-
-	int cacheHits;
+	/* yaffs2 runtime stuff */
+	unsigned seq_number;	/* Sequence number of currently
+					allocating block */
+	unsigned oldest_dirty_seq;
+	unsigned oldest_dirty_block;
+
+	/* Block refreshing */
+	int refresh_skip;	/* A skip down counter.
+				 * Refresh happens when this gets to zero. */
+
+	/* Dirty directory handling */
+	struct list_head dirty_dirs;	/* List of dirty directories */
+
+	/* Summary */
+	int chunks_per_summary;
+	struct yaffs_summary_tags *sum_tags;
+
+	/* Statistics */
+	u32 n_page_writes;
+	u32 n_page_reads;
+	u32 n_erasures;
+	u32 n_erase_failures;
+	u32 n_gc_copies;
+	u32 all_gcs;
+	u32 passive_gc_count;
+	u32 oldest_dirty_gc_count;
+	u32 n_gc_blocks;
+	u32 bg_gcs;
+	u32 n_retried_writes;
+	u32 n_retired_blocks;
+	u32 n_ecc_fixed;
+	u32 n_ecc_unfixed;
+	u32 n_tags_ecc_fixed;
+	u32 n_tags_ecc_unfixed;
+	u32 n_deletions;
+	u32 n_unmarked_deletions;
+	u32 refresh_count;
+	u32 cache_hits;
+	u32 tags_used;
+	u32 summary_used;
 
-	/* Stuff for background deletion and unlinked files.*/
-	yaffs_Object *unlinkedDir;	/* Directory where unlinked and deleted files live. */
-	yaffs_Object *deletedDir;	/* Directory where deleted objects are sent to disappear. */
-	yaffs_Object *unlinkedDeletion;	/* Current file being background deleted.*/
-	int nDeletedFiles;		/* Count of files awaiting deletion;*/
-	int nUnlinkedFiles;		/* Count of unlinked files. */
-	int nBackgroundDeletions;	/* Count of background deletions. */
+};
 
+/* The CheckpointDevice structure holds the device information that changes
+ *at runtime and must be preserved over unmount/mount cycles.
+ */
+struct yaffs_checkpt_dev {
+	int struct_type;
+	int n_erased_blocks;
+	int alloc_block;	/* Current block being allocated off */
+	u32 alloc_page;
+	int n_free_chunks;
 
-	yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
-	int maxTemp;
-	int unmanagedTempAllocations;
-	int unmanagedTempDeallocations;
+	int n_deleted_files;	/* Count of files awaiting deletion; */
+	int n_unlinked_files;	/* Count of unlinked files. */
+	int n_bg_deletions;	/* Count of background deletions. */
 
 	/* yaffs2 runtime stuff */
-	unsigned sequenceNumber;	/* Sequence number of currently allocating block */
-	unsigned oldestDirtySequence;
+	unsigned seq_number;	/* Sequence number of currently
+				 * allocating block */
 
 };
 
-typedef struct yaffs_DeviceStruct yaffs_Device;
-
-/* The static layout of bllock usage etc is stored in the super block header */
-typedef struct {
-	int StructType;
-	int version;
-	int checkpointStartBlock;
-	int checkpointEndBlock;
-	int startBlock;
-	int endBlock;
-	int rfu[100];
-} yaffs_SuperBlockHeader;
-
-/* The CheckpointDevice structure holds the device information that changes at runtime and
- * must be preserved over unmount/mount cycles.
- */
-typedef struct {
-	int structType;
-	int nErasedBlocks;
-	int allocationBlock;	/* Current block being allocated off */
-	__u32 allocationPage;
-	int nFreeChunks;
+struct yaffs_checkpt_validity {
+	int struct_type;
+	u32 magic;
+	u32 version;
+	u32 head;
+};
 
-	int nDeletedFiles;		/* Count of files awaiting deletion;*/
-	int nUnlinkedFiles;		/* Count of unlinked files. */
-	int nBackgroundDeletions;	/* Count of background deletions. */
+struct yaffs_shadow_fixer {
+	int obj_id;
+	int shadowed_id;
+	struct yaffs_shadow_fixer *next;
+};
 
-	/* yaffs2 runtime stuff */
-	unsigned sequenceNumber;	/* Sequence number of currently allocating block */
-	unsigned oldestDirtySequence;
-
-} yaffs_CheckpointDevice;
-
-
-typedef struct {
-    int structType;
-    __u32 magic;
-    __u32 version;
-    __u32 head;
-} yaffs_CheckpointValidity;
-
-/* Function to manipulate block info */
-static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
-{
-	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR
-		   ("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),
-		   blk));
-		YBUG();
-	}
-	return &dev->blockInfo[blk - dev->internalStartBlock];
-}
+/* Structure for doing xattr modifications */
+struct yaffs_xattr_mod {
+	int set;		/* If 0 then this is a deletion */
+	const YCHAR *name;
+	const void *data;
+	int size;
+	int flags;
+	int result;
+};
 
 /*----------------------- YAFFS Functions -----------------------*/
 
-int yaffs_GutsInitialise(yaffs_Device * dev);
-void yaffs_Deinitialise(yaffs_Device * dev);
+int yaffs_guts_initialise(struct yaffs_dev *dev);
+void yaffs_deinitialise(struct yaffs_dev *dev);
 
-int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev);
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
 
-int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
-		       yaffs_Object * newDir, const YCHAR * newName);
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+		     struct yaffs_obj *new_dir, const YCHAR * new_name);
 
-int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name);
-int yaffs_DeleteFile(yaffs_Object * obj);
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
+int yaffs_del_obj(struct yaffs_obj *obj);
 
-int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize);
-int yaffs_GetObjectFileLength(yaffs_Object * obj);
-int yaffs_GetObjectInode(yaffs_Object * obj);
-unsigned yaffs_GetObjectType(yaffs_Object * obj);
-int yaffs_GetObjectLinkCount(yaffs_Object * obj);
-
-int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr);
-int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr);
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
+loff_t yaffs_get_obj_length(struct yaffs_obj *obj);
+int yaffs_get_obj_inode(struct yaffs_obj *obj);
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
+int yaffs_get_obj_link_count(struct yaffs_obj *obj);
 
 /* File operations */
-int yaffs_ReadDataFromFile(yaffs_Object * obj, __u8 * buffer, loff_t offset,
-			   int nBytes);
-int yaffs_WriteDataToFile(yaffs_Object * obj, const __u8 * buffer, loff_t offset,
-			  int nBytes, int writeThrough);
-int yaffs_ResizeFile(yaffs_Object * obj, loff_t newSize);
+int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset,
+		  int n_bytes);
+int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset,
+		  int n_bytes, int write_trhrough);
+int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+				    const YCHAR *name, u32 mode, u32 uid,
+				    u32 gid);
 
-yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
-			      __u32 mode, __u32 uid, __u32 gid);
-int yaffs_FlushFile(yaffs_Object * obj, int updateTime);
+int yaffs_flush_file(struct yaffs_obj *obj, int update_time, int data_sync);
 
 /* Flushing and checkpointing */
-void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
+void yaffs_flush_whole_cache(struct yaffs_dev *dev);
 
-int yaffs_CheckpointSave(yaffs_Device *dev);
-int yaffs_CheckpointRestore(yaffs_Device *dev);
+int yaffs_checkpoint_save(struct yaffs_dev *dev);
+int yaffs_checkpoint_restore(struct yaffs_dev *dev);
 
 /* Directory operations */
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
-				   __u32 mode, __u32 uid, __u32 gid);
-yaffs_Object *yaffs_FindObjectByName(yaffs_Object * theDir, const YCHAR * name);
-int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
-				   int (*fn) (yaffs_Object *));
-
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number);
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
+				   u32 mode, u32 uid, u32 gid);
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
+				     const YCHAR *name);
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
 
 /* Link operations */
-yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
-			 yaffs_Object * equivalentObject);
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name,
+				 struct yaffs_obj *equiv_obj);
 
-yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj);
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
 
 /* Symlink operations */
-yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
-				 __u32 mode, __u32 uid, __u32 gid,
-				 const YCHAR * alias);
-YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj);
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, const YCHAR *alias);
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
 
 /* Special inodes (fifos, sockets and devices) */
-yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
-				 __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, u32 rdev);
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name,
+		      const void *value, int size, int flags);
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value,
+		      int size);
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name);
 
 /* Special directories */
-yaffs_Object *yaffs_Root(yaffs_Device * dev);
-yaffs_Object *yaffs_LostNFound(yaffs_Device * dev);
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
 
-#ifdef CONFIG_YAFFS_WINCE
-/* CONFIG_YAFFS_WINCE special stuff */
-void yfsd_WinFileTimeNow(__u32 target[2]);
-#endif
+void yaffs_handle_defered_free(struct yaffs_obj *obj);
 
-/* XXX U-BOOT XXX */
-#if 0
-#ifndef __KERNEL__
-void yaffs_HandleDeferedFree(yaffs_Object * obj);
-#endif
-#endif
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
 
-/* Debug dump  */
-int yaffs_DumpObject(yaffs_Object * obj);
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
 
-void yaffs_GutsTest(yaffs_Device * dev);
+/* Debug dump  */
+int yaffs_dump_obj(struct yaffs_obj *obj);
+
+void yaffs_guts_test(struct yaffs_dev *dev);
+
+/* A few useful functions to be used within the core files*/
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+		     int lyn);
+int yaffs_check_ff(u8 *buffer, int n_bytes);
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+			      struct yaffs_block_info *bi);
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev);
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer);
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+						 int number,
+						 enum yaffs_obj_type type);
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+			    int nand_chunk, int in_scan);
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name);
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+				const struct yaffs_obj_hdr *oh);
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
+YCHAR *yaffs_clone_str(const YCHAR *str);
+void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list);
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name,
+		    int force, int is_shrink, int shadows,
+		    struct yaffs_xattr_mod *xop);
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+			       int backward_scanning);
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+					   struct yaffs_file_var *file_struct,
+					   u32 chunk_id,
+					   struct yaffs_tnode *passed_tn);
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+		     int n_bytes, int write_trhrough);
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size);
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+				       struct yaffs_file_var *file_struct,
+				       u32 chunk_id);
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			 unsigned pos);
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
+
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+				int *chunk_out, u32 *offset_out);
+/*
+ * Marshalling functions to get loff_t file sizes into aand out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize);
+loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh);
+loff_t yaffs_max_file_size(struct yaffs_dev *dev);
 
-/* A few useful functions */
-void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
-void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn);
-int yaffs_CheckFF(__u8 * buffer, int nBytes);
-void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi);
 
 #endif
diff --git a/fs/yaffs2/yaffs_hweight.c b/fs/yaffs2/yaffs_hweight.c
new file mode 100644
index 0000000..d96773e
--- /dev/null
+++ b/fs/yaffs2/yaffs_hweight.c
@@ -0,0 +1,52 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* These functions have been renamed to hweightxx to match the
+ * equivaqlent functions in the Linux kernel.
+ */
+
+#include "yaffs_hweight.h"
+
+static const char yaffs_count_bits_table[256] = {
+	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
+};
+
+int yaffs_hweight8(u8 x)
+{
+	int ret_val;
+	ret_val = yaffs_count_bits_table[x];
+	return ret_val;
+}
+
+int yaffs_hweight32(u32 x)
+{
+	return yaffs_hweight8(x & 0xff) +
+		yaffs_hweight8((x >> 8) & 0xff) +
+		yaffs_hweight8((x >> 16) & 0xff) +
+		yaffs_hweight8((x >> 24) & 0xff);
+}
diff --git a/fs/yaffs2/yaffs_malloc.h b/fs/yaffs2/yaffs_hweight.h
index 3ed6175..3f7c6c3 100644
--- a/fs/yaffs2/yaffs_malloc.h
+++ b/fs/yaffs2/yaffs_hweight.h
@@ -1,8 +1,7 @@
-#ifndef __YAFFS_MALLOC_H__
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -14,12 +13,12 @@
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  */
 
-/* XXX U-BOOT XXX */
-#if 0
-#include <stdlib.h>
-#endif
+#ifndef __YAFFS_HWEIGHT_H__
+#define __YAFFS_HWEIGHT_H__
+
+#include "yportenv.h"
 
-void *yaffs_malloc(size_t size);
-void yaffs_free(void *ptr);
+int yaffs_hweight8(u8 x);
+int yaffs_hweight32(u32 x);
 
 #endif
diff --git a/fs/yaffs2/yaffs_list.h b/fs/yaffs2/yaffs_list.h
new file mode 100644
index 0000000..a7afaea
--- /dev/null
+++ b/fs/yaffs2/yaffs_list.h
@@ -0,0 +1,126 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This file is just holds extra declarations of macros that would normally
+ * be providesd in the Linux kernel. These macros have been written from
+ * scratch but are functionally equivalent to the Linux ones.
+ *
+ */
+
+#ifndef __YAFFS_LIST_H__
+#define __YAFFS_LIST_H__
+
+
+/*
+ * This is a simple doubly linked list implementation that matches the
+ * way the Linux kernel doubly linked list implementation works.
+ */
+
+struct list_head {
+	struct list_head *next; /* next in chain */
+	struct list_head *prev; /* previous in chain */
+};
+
+
+/* Initialise a static list */
+#define LIST_HEAD(name) \
+struct list_head name = { &(name), &(name)}
+
+
+
+/* Initialise a list head to an empty list */
+#define INIT_LIST_HEAD(p) \
+do { \
+	(p)->next = (p);\
+	(p)->prev = (p); \
+} while (0)
+
+
+/* Add an element to a list */
+static inline void list_add(struct list_head *new_entry,
+				struct list_head *list)
+{
+	struct list_head *list_next = list->next;
+
+	list->next = new_entry;
+	new_entry->prev = list;
+	new_entry->next = list_next;
+	list_next->prev = new_entry;
+
+}
+
+static inline void list_add_tail(struct list_head *new_entry,
+				 struct list_head *list)
+{
+	struct list_head *list_prev = list->prev;
+
+	list->prev = new_entry;
+	new_entry->next = list;
+	new_entry->prev = list_prev;
+	list_prev->next = new_entry;
+
+}
+
+
+/* Take an element out of its current list, with or without
+ * reinitialising the links.of the entry*/
+static inline void list_del(struct list_head *entry)
+{
+	struct list_head *list_next = entry->next;
+	struct list_head *list_prev = entry->prev;
+
+	list_next->prev = list_prev;
+	list_prev->next = list_next;
+
+}
+
+static inline void list_del_init(struct list_head *entry)
+{
+	list_del(entry);
+	entry->next = entry->prev = entry;
+}
+
+
+/* Test if the list is empty */
+static inline int list_empty(struct list_head *entry)
+{
+	return (entry->next == entry);
+}
+
+
+/* list_entry takes a pointer to a list entry and offsets it to that
+ * we can find a pointer to the object it is embedded in.
+ */
+
+
+#define list_entry(entry, type, member) \
+	((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
+
+
+/* list_for_each and list_for_each_safe  iterate over lists.
+ * list_for_each_safe uses temporary storage to make the list delete safe
+ */
+
+#define list_for_each(itervar, list) \
+	for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
+
+#define list_for_each_safe(itervar, save_var, list) \
+	for (itervar = (list)->next, save_var = (list)->next->next; \
+		itervar != (list); \
+		itervar = save_var, save_var = save_var->next)
+
+
+#endif
diff --git a/fs/yaffs2/yaffs_mtdif.c b/fs/yaffs2/yaffs_mtdif.c
index d0e16d0..db49052 100644
--- a/fs/yaffs2/yaffs_mtdif.c
+++ b/fs/yaffs2/yaffs_mtdif.c
@@ -14,9 +14,6 @@
 /* XXX U-BOOT XXX */
 #include <common.h>
 
-const char *yaffs_mtdif_c_version =
-    "$Id: yaffs_mtdif.c,v 1.19 2007/02/14 01:09:06 wookey Exp $";
-
 #include "yportenv.h"
 
 
@@ -27,72 +24,56 @@ const char *yaffs_mtdif_c_version =
 #include "linux/time.h"
 #include "linux/mtd/nand.h"
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
-static struct nand_oobinfo yaffs_oobinfo = {
-	.useecc = 1,
-	.eccbytes = 6,
-	.eccpos = {8, 9, 10, 13, 14, 15}
-};
-
-static struct nand_oobinfo yaffs_noeccinfo = {
-	.useecc = 0,
-};
-#endif
 
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
+static inline void translate_spare2oob(const struct yaffs_spare *spare, u8 *oob)
 {
-	oob[0] = spare->tagByte0;
-	oob[1] = spare->tagByte1;
-	oob[2] = spare->tagByte2;
-	oob[3] = spare->tagByte3;
-	oob[4] = spare->tagByte4;
-	oob[5] = spare->tagByte5 & 0x3f;
-	oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
-	oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
-	oob[6] = spare->tagByte6;
-	oob[7] = spare->tagByte7;
+	oob[0] = spare->tb0;
+	oob[1] = spare->tb1;
+	oob[2] = spare->tb2;
+	oob[3] = spare->tb3;
+	oob[4] = spare->tb4;
+	oob[5] = spare->tb5 & 0x3f;
+	oob[5] |= spare->block_status == 'Y' ? 0 : 0x80;
+	oob[5] |= spare->page_status == 0 ? 0 : 0x40;
+	oob[6] = spare->tb6;
+	oob[7] = spare->tb7;
 }
 
-static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
+static inline void translate_oob2spare(struct yaffs_spare *spare, u8 *oob)
 {
-	struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
-	spare->tagByte0 = oob[0];
-	spare->tagByte1 = oob[1];
-	spare->tagByte2 = oob[2];
-	spare->tagByte3 = oob[3];
-	spare->tagByte4 = oob[4];
-	spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
-	spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
-	spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
+	struct yaffs_nand_spare *nspare = (struct yaffs_nand_spare *)spare;
+	spare->tb0 = oob[0];
+	spare->tb1 = oob[1];
+	spare->tb2 = oob[2];
+	spare->tb3 = oob[3];
+	spare->tb4 = oob[4];
+	spare->tb5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
+	spare->block_status = oob[5] & 0x80 ? 0xff : 'Y';
+	spare->page_status = oob[5] & 0x40 ? 0xff : 0;
 	spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
-	spare->tagByte6 = oob[6];
-	spare->tagByte7 = oob[7];
+	spare->tb6 = oob[6];
+	spare->tb7 = oob[7];
 	spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
 
 	nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
 }
-#endif
 
-int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
-			     const __u8 * data, const yaffs_Spare * spare)
+
+int nandmtd_WriteChunkToNAND(struct yaffs_dev *dev, int chunkInNAND,
+			     const u8 *data, const struct yaffs_spare *spare)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 	struct mtd_oob_ops ops;
-#endif
 	size_t dummy;
 	int retval = 0;
-
-	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-	__u8 spareAsBytes[8]; /* OOB */
+	loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
+	u8 spareAsBytes[8]; /* OOB */
 
 	if (data && !spare)
-		retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
+		retval = mtd->write(mtd, addr, dev->data_bytes_per_chunk,
 				&dummy, data);
 	else if (spare) {
-		if (dev->useNANDECC) {
+		if (dev->param.use_nand_ecc) {
 			translate_spare2oob(spare, spareAsBytes);
 			ops.mode = MTD_OOB_AUTO;
 			ops.ooblen = 8; /* temp hack */
@@ -100,37 +81,12 @@ int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
 			ops.mode = MTD_OOB_RAW;
 			ops.ooblen = YAFFS_BYTES_PER_SPARE;
 		}
-		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
+		ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
 		ops.datbuf = (u8 *)data;
 		ops.ooboffs = 0;
 		ops.oobbuf = spareAsBytes;
 		retval = mtd->write_oob(mtd, addr, &ops);
 	}
-#else
-	__u8 *spareAsBytes = (__u8 *) spare;
-
-	if (data && spare) {
-		if (dev->useNANDECC)
-			retval =
-			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					   &dummy, data, spareAsBytes,
-					   &yaffs_oobinfo);
-		else
-			retval =
-			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					   &dummy, data, spareAsBytes,
-					   &yaffs_noeccinfo);
-	} else {
-		if (data)
-			retval =
-			    mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-				       data);
-		if (spare)
-			retval =
-			    mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
-					   &dummy, spareAsBytes);
-	}
-#endif
 
 	if (retval == 0)
 		return YAFFS_OK;
@@ -138,69 +94,36 @@ int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
 		return YAFFS_FAIL;
 }
 
-int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
-			      yaffs_Spare * spare)
+int nandmtd_ReadChunkFromNAND(struct yaffs_dev *dev, int chunkInNAND, u8 *data,
+			      struct yaffs_spare *spare)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 	struct mtd_oob_ops ops;
-#endif
 	size_t dummy;
 	int retval = 0;
 
-	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-	__u8 spareAsBytes[8]; /* OOB */
+	loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
+	u8 spareAsBytes[8]; /* OOB */
 
 	if (data && !spare)
-		retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
+		retval = mtd->read(mtd, addr, dev->data_bytes_per_chunk,
 				&dummy, data);
 	else if (spare) {
-		if (dev->useNANDECC) {
+		if (dev->param.use_nand_ecc) {
 			ops.mode = MTD_OOB_AUTO;
 			ops.ooblen = 8; /* temp hack */
 		} else {
 			ops.mode = MTD_OOB_RAW;
 			ops.ooblen = YAFFS_BYTES_PER_SPARE;
 		}
-		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
+		ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
 		ops.datbuf = data;
 		ops.ooboffs = 0;
 		ops.oobbuf = spareAsBytes;
 		retval = mtd->read_oob(mtd, addr, &ops);
-		if (dev->useNANDECC)
+		if (dev->param.use_nand_ecc)
 			translate_oob2spare(spare, spareAsBytes);
 	}
-#else
-	__u8 *spareAsBytes = (__u8 *) spare;
-
-	if (data && spare) {
-		if (dev->useNANDECC) {
-			/* Careful, this call adds 2 ints */
-			/* to the end of the spare data.  Calling function */
-			/* should allocate enough memory for spare, */
-			/* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
-			retval =
-			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					  &dummy, data, spareAsBytes,
-					  &yaffs_oobinfo);
-		} else {
-			retval =
-			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					  &dummy, data, spareAsBytes,
-					  &yaffs_noeccinfo);
-		}
-	} else {
-		if (data)
-			retval =
-			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-				      data);
-		if (spare)
-			retval =
-			    mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
-					  &dummy, spareAsBytes);
-	}
-#endif
 
 	if (retval == 0)
 		return YAFFS_OK;
@@ -208,18 +131,18 @@ int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
 		return YAFFS_FAIL;
 }
 
-int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
+int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 	__u32 addr =
-	    ((loff_t) blockNumber) * dev->nDataBytesPerChunk
-		* dev->nChunksPerBlock;
+	    ((loff_t) blockNumber) * dev->data_bytes_per_chunk
+		* dev->param.chunks_per_block;
 	struct erase_info ei;
 	int retval = 0;
 
 	ei.mtd = mtd;
 	ei.addr = addr;
-	ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
+	ei.len = dev->data_bytes_per_chunk * dev->param.chunks_per_block;
 	ei.time = 1000;
 	ei.retries = 2;
 	ei.callback = NULL;
@@ -227,10 +150,6 @@ int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 
 	/* Todo finish off the ei if required */
 
-/* XXX U-BOOT XXX */
-#if 0
-	sema_init(&dev->sem, 0);
-#endif
 
 	retval = mtd->erase(mtd, &ei);
 
@@ -240,7 +159,7 @@ int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 		return YAFFS_FAIL;
 }
 
-int nandmtd_InitialiseNAND(yaffs_Device * dev)
+int nandmtd_InitialiseNAND(struct yaffs_dev *dev)
 {
 	return YAFFS_OK;
 }
diff --git a/fs/yaffs2/yaffs_mtdif.h b/fs/yaffs2/yaffs_mtdif.h
index 317600c..1a12582 100644
--- a/fs/yaffs2/yaffs_mtdif.h
+++ b/fs/yaffs2/yaffs_mtdif.h
@@ -18,10 +18,10 @@
 
 #include "yaffs_guts.h"
 
-int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
-			     const __u8 * data, const yaffs_Spare * spare);
-int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
-			      yaffs_Spare * spare);
-int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber);
-int nandmtd_InitialiseNAND(yaffs_Device * dev);
+int nandmtd_WriteChunkToNAND(struct yaffs_dev *dev, int chunkInNAND,
+			     const u8 *data, const struct yaffs_spare *spare);
+int nandmtd_ReadChunkFromNAND(struct yaffs_dev *dev, int chunkInNAND, u8 *data,
+			      struct yaffs_spare *spare);
+int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber);
+int nandmtd_InitialiseNAND(struct yaffs_dev *dev);
 #endif
diff --git a/fs/yaffs2/yaffs_mtdif2.c b/fs/yaffs2/yaffs_mtdif2.c
index f569b99..b27fe56 100644
--- a/fs/yaffs2/yaffs_mtdif2.c
+++ b/fs/yaffs2/yaffs_mtdif2.c
@@ -17,11 +17,8 @@
 #include <common.h>
 #include "asm/errno.h"
 
-const char *yaffs_mtdif2_c_version =
-    "$Id: yaffs_mtdif2.c,v 1.17 2007/02/14 01:09:06 wookey Exp $";
-
 #include "yportenv.h"
-
+#include "yaffs_trace.h"
 
 #include "yaffs_mtdif2.h"
 
@@ -29,71 +26,67 @@ const char *yaffs_mtdif2_c_version =
 #include "linux/types.h"
 #include "linux/time.h"
 
+#include "yaffs_trace.h"
 #include "yaffs_packedtags2.h"
+#include "string.h"
 
-int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
-				      const __u8 * data,
-				      const yaffs_ExtendedTags * tags)
-{
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-	struct mtd_oob_ops ops;
-#else
-	size_t dummy;
-#endif
-	int retval = 0;
-
-	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-
-	yaffs_PackedTags2 pt;
+#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
+#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
 
-	T(YAFFS_TRACE_MTD,
-	  (TSTR
-	   ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
-	    TENDSTR), chunkInNAND, data, tags));
 
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-	if (tags)
-		yaffs_PackTags2(&pt, tags);
-	else
-		BUG(); /* both tags and data should always be present */
+/* NB For use with inband tags....
+ * We assume that the data buffer is of size total_bytes_per_chunk so
+ * that we can also use it to load the tags.
+ */
+int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+			      const u8 *data,
+			      const struct yaffs_ext_tags *tags)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	struct mtd_oob_ops ops;
 
-	if (data) {
-		ops.mode = MTD_OOB_AUTO;
-		ops.ooblen = sizeof(pt);
-		ops.len = dev->nDataBytesPerChunk;
-		ops.ooboffs = 0;
-		ops.datbuf = (__u8 *)data;
-		ops.oobbuf = (void *)&pt;
-		retval = mtd->write_oob(mtd, addr, &ops);
-	} else
-		BUG(); /* both tags and data should always be present */
-#else
-	if (tags) {
-		yaffs_PackTags2(&pt, tags);
-	}
+	int retval = 0;
 
-	if (data && tags) {
-		if (dev->useNANDECC)
-			retval =
-			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					   &dummy, data, (__u8 *) & pt, NULL);
-		else
-			retval =
-			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					   &dummy, data, (__u8 *) & pt, NULL);
+	loff_t addr;
+	u8 local_spare[128];
+
+	struct yaffs_packed_tags2 pt;
+
+	int packed_tags_size =
+	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+	void *packed_tags_ptr =
+	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"nandmtd2_write_chunk_tags chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+	addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+
+	/* For yaffs2 writing there must be both data and tags.
+	 * If we're using inband tags, then the tags are stuffed into
+	 * the end of the data buffer.
+	 */
+	if (!data || !tags)
+		BUG();
+	else if (dev->param.inband_tags) {
+		struct yaffs_packed_tags2_tags_only *pt2tp;
+		pt2tp =
+		    (struct yaffs_packed_tags2_tags_only *)(data +
+							dev->
+							data_bytes_per_chunk);
+		yaffs_pack_tags2_tags_only(pt2tp, tags);
 	} else {
-		if (data)
-			retval =
-			    mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-				       data);
-		if (tags)
-			retval =
-			    mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,
-					   (__u8 *) & pt);
-
+		yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
 	}
-#endif
+
+	ops.mode = MTD_OOB_AUTO;
+	ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
+	ops.len = dev->param.total_bytes_per_chunk;
+	ops.ooboffs = 0;
+	ops.datbuf = (u8 *) data;
+	ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
+	retval = mtd->write_oob(mtd, addr, &ops);
 
 	if (retval == 0)
 		return YAFFS_OK;
@@ -101,88 +94,97 @@ int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
 		return YAFFS_FAIL;
 }
 
-int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
-				       __u8 * data, yaffs_ExtendedTags * tags)
+int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+			     u8 *data, struct yaffs_ext_tags *tags)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	u8 local_spare[128];
 	struct mtd_oob_ops ops;
-#endif
 	size_t dummy;
 	int retval = 0;
+	int local_data = 0;
+	struct yaffs_packed_tags2 pt;
+	loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+	int packed_tags_size =
+	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+	void *packed_tags_ptr =
+	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"nandmtd2_read_chunk_tags chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+	if (dev->param.inband_tags) {
+
+		if (!data) {
+			local_data = 1;
+			data = yaffs_get_temp_buffer(dev);
+		}
 
-	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-
-	yaffs_PackedTags2 pt;
-
-	T(YAFFS_TRACE_MTD,
-	  (TSTR
-	   ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
-	    TENDSTR), chunkInNAND, data, tags));
+	}
 
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-	if (data && !tags)
-		retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
-				&dummy, data);
+	if (dev->param.inband_tags || (data && !tags))
+		retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
+				   &dummy, data);
 	else if (tags) {
 		ops.mode = MTD_OOB_AUTO;
-		ops.ooblen = sizeof(pt);
-		ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
+		ops.ooblen = packed_tags_size;
+		ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
 		ops.ooboffs = 0;
 		ops.datbuf = data;
-		ops.oobbuf = dev->spareBuffer;
+		ops.oobbuf = local_spare;
 		retval = mtd->read_oob(mtd, addr, &ops);
 	}
-#else
-	if (data && tags) {
-		if (dev->useNANDECC) {
-			retval =
-			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					  &dummy, data, dev->spareBuffer,
-					  NULL);
-		} else {
-			retval =
-			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					  &dummy, data, dev->spareBuffer,
-					  NULL);
+
+	if (dev->param.inband_tags) {
+		if (tags) {
+			struct yaffs_packed_tags2_tags_only *pt2tp;
+			pt2tp =
+				(struct yaffs_packed_tags2_tags_only *)
+				&data[dev->data_bytes_per_chunk];
+			yaffs_unpack_tags2_tags_only(tags, pt2tp);
 		}
 	} else {
-		if (data)
-			retval =
-			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-				      data);
-		if (tags)
-			retval =
-			    mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
-					  dev->spareBuffer);
+		if (tags) {
+			memcpy(packed_tags_ptr,
+			       local_spare,
+			       packed_tags_size);
+			yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
+		}
 	}
-#endif
-
-	memcpy(&pt, dev->spareBuffer, sizeof(pt));
 
-	if (tags)
-		yaffs_UnpackTags2(tags, &pt);
-
-	if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
-		tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
+	if (local_data)
+		yaffs_release_temp_buffer(dev, data);
 
+	if (tags && retval == -EBADMSG
+	    && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
+		tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+		dev->n_ecc_unfixed++;
+	}
+	if (tags && retval == -EUCLEAN
+	    && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
+		tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
+		dev->n_ecc_fixed++;
+	}
 	if (retval == 0)
 		return YAFFS_OK;
 	else
 		return YAFFS_FAIL;
 }
 
-int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+
+int nandmtd2_MarkNANDBlockBad(struct yaffs_dev *dev, int blockNo)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 	int retval;
-	T(YAFFS_TRACE_MTD,
-	  (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"nandmtd2_MarkNANDBlockBad %d", blockNo);
 
 	retval =
 	    mtd->block_markbad(mtd,
-			       blockNo * dev->nChunksPerBlock *
-			       dev->nDataBytesPerChunk);
+			       blockNo * dev->param.chunks_per_block *
+			       dev->data_bytes_per_chunk);
 
 	if (retval == 0)
 		return YAFFS_OK;
@@ -191,42 +193,40 @@ int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 
 }
 
-int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
-			    yaffs_BlockState * state, int *sequenceNumber)
+int nandmtd2_QueryNANDBlock(struct yaffs_dev *dev, int blockNo,
+			    enum yaffs_block_state *state, u32 *sequenceNumber)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 	int retval;
 
-	T(YAFFS_TRACE_MTD,
-	  (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
+	yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_QueryNANDBlock %d", blockNo);
 	retval =
 	    mtd->block_isbad(mtd,
-			     blockNo * dev->nChunksPerBlock *
-			     dev->nDataBytesPerChunk);
+			     blockNo * dev->param.chunks_per_block *
+			     dev->data_bytes_per_chunk);
 
 	if (retval) {
-		T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
+		yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
 
 		*state = YAFFS_BLOCK_STATE_DEAD;
 		*sequenceNumber = 0;
 	} else {
-		yaffs_ExtendedTags t;
-		nandmtd2_ReadChunkWithTagsFromNAND(dev,
-						   blockNo *
-						   dev->nChunksPerBlock, NULL,
-						   &t);
-
-		if (t.chunkUsed) {
-			*sequenceNumber = t.sequenceNumber;
-			*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+		struct yaffs_ext_tags t;
+		nandmtd2_read_chunk_tags(dev,
+					   blockNo *
+					   dev->param.chunks_per_block, NULL,
+					   &t);
+
+		if (t.chunk_used) {
+			*sequenceNumber = t.seq_number;
+			*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
 		} else {
 			*sequenceNumber = 0;
 			*state = YAFFS_BLOCK_STATE_EMPTY;
 		}
 	}
-	T(YAFFS_TRACE_MTD,
-	  (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
-	   *state));
+	yaffs_trace(YAFFS_TRACE_MTD, "block is bad seq %d state %d",
+			*sequenceNumber, *state);
 
 	if (retval == 0)
 		return YAFFS_OK;
diff --git a/fs/yaffs2/yaffs_mtdif2.h b/fs/yaffs2/yaffs_mtdif2.h
index b67ba52..62be173 100644
--- a/fs/yaffs2/yaffs_mtdif2.h
+++ b/fs/yaffs2/yaffs_mtdif2.h
@@ -17,13 +17,14 @@
 #define __YAFFS_MTDIF2_H__
 
 #include "yaffs_guts.h"
-int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
-				      const __u8 * data,
-				      const yaffs_ExtendedTags * tags);
-int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
-				       __u8 * data, yaffs_ExtendedTags * tags);
-int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
-int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
-			    yaffs_BlockState * state, int *sequenceNumber);
+
+int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int chunkInNAND,
+				      const u8 *data,
+				      const struct yaffs_ext_tags *tags);
+int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int chunkInNAND,
+				       u8 *data, struct yaffs_ext_tags *tags);
+int nandmtd2_MarkNANDBlockBad(struct yaffs_dev *dev, int blockNo);
+int nandmtd2_QueryNANDBlock(struct yaffs_dev *dev, int blockNo,
+			    enum yaffs_block_state *state, u32 *sequenceNumber);
 
 #endif
diff --git a/fs/yaffs2/yaffs_nameval.c b/fs/yaffs2/yaffs_nameval.c
new file mode 100644
index 0000000..a20a3e4
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.c
@@ -0,0 +1,208 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of
+* values and fits into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ *  sizeof(int) bytes   record size.
+ *  yaffs_strnlen+1 bytes name null terminated.
+ *  nbytes    value.
+ *  ----------
+ *  total size  stored in record size
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+#include "yaffs_nameval.h"
+
+#include "yportenv.h"
+
+static int nval_find(const char *xb, int xb_size, const YCHAR *name,
+		     int *exist_size)
+{
+	int pos = 0;
+	int size;
+
+	memcpy(&size, xb, sizeof(int));
+	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+		if (!yaffs_strncmp((YCHAR *) (xb + pos + sizeof(int)),
+				name, size)) {
+			if (exist_size)
+				*exist_size = size;
+			return pos;
+		}
+		pos += size;
+		if (pos < xb_size - sizeof(int))
+			memcpy(&size, xb + pos, sizeof(int));
+		else
+			size = 0;
+	}
+	if (exist_size)
+		*exist_size = 0;
+	return -ENODATA;
+}
+
+static int nval_used(const char *xb, int xb_size)
+{
+	int pos = 0;
+	int size;
+
+	memcpy(&size, xb + pos, sizeof(int));
+	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+		pos += size;
+		if (pos < xb_size - sizeof(int))
+			memcpy(&size, xb + pos, sizeof(int));
+		else
+			size = 0;
+	}
+	return pos;
+}
+
+int nval_del(char *xb, int xb_size, const YCHAR *name)
+{
+	int pos = nval_find(xb, xb_size, name, NULL);
+	int size;
+
+	if (pos < 0 || pos >= xb_size)
+		return -ENODATA;
+
+	/* Find size, shift rest over this record,
+	 * then zero out the rest of buffer */
+	memcpy(&size, xb + pos, sizeof(int));
+	memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+	memset(xb + (xb_size - size), 0, size);
+	return 0;
+}
+
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf,
+		int bsize, int flags)
+{
+	int pos;
+	int namelen = yaffs_strnlen(name, xb_size);
+	int reclen;
+	int size_exist = 0;
+	int space;
+	int start;
+
+	pos = nval_find(xb, xb_size, name, &size_exist);
+
+	if (flags & XATTR_CREATE && pos >= 0)
+		return -EEXIST;
+	if (flags & XATTR_REPLACE && pos < 0)
+		return -ENODATA;
+
+	start = nval_used(xb, xb_size);
+	space = xb_size - start + size_exist;
+
+	reclen = (sizeof(int) + namelen + 1 + bsize);
+
+	if (reclen > space)
+		return -ENOSPC;
+
+	if (pos >= 0) {
+		nval_del(xb, xb_size, name);
+		start = nval_used(xb, xb_size);
+	}
+
+	pos = start;
+
+	memcpy(xb + pos, &reclen, sizeof(int));
+	pos += sizeof(int);
+	yaffs_strncpy((YCHAR *) (xb + pos), name, reclen);
+	pos += (namelen + 1);
+	memcpy(xb + pos, buf, bsize);
+	return 0;
+}
+
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+	     int bsize)
+{
+	int pos = nval_find(xb, xb_size, name, NULL);
+	int size;
+
+	if (pos >= 0 && pos < xb_size) {
+
+		memcpy(&size, xb + pos, sizeof(int));
+		pos += sizeof(int);	/* advance past record length */
+		size -= sizeof(int);
+
+		/* Advance over name string */
+		while (xb[pos] && size > 0 && pos < xb_size) {
+			pos++;
+			size--;
+		}
+		/*Advance over NUL */
+		pos++;
+		size--;
+
+		/* If bsize is zero then this is a size query.
+		 * Return the size, but don't copy.
+		 */
+		if (!bsize)
+			return size;
+
+		if (size <= bsize) {
+			memcpy(buf, xb + pos, size);
+			return size;
+		}
+	}
+	if (pos >= 0)
+		return -ERANGE;
+
+	return -ENODATA;
+}
+
+int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+{
+	int pos = 0;
+	int size;
+	int name_len;
+	int ncopied = 0;
+	int filled = 0;
+
+	memcpy(&size, xb + pos, sizeof(int));
+	while (size > sizeof(int) &&
+		size <= xb_size &&
+		(pos + size) < xb_size &&
+		!filled) {
+		pos += sizeof(int);
+		size -= sizeof(int);
+		name_len = yaffs_strnlen((YCHAR *) (xb + pos), size);
+		if (ncopied + name_len + 1 < bsize) {
+			memcpy(buf, xb + pos, name_len * sizeof(YCHAR));
+			buf += name_len;
+			*buf = '\0';
+			buf++;
+			if (sizeof(YCHAR) > 1) {
+				*buf = '\0';
+				buf++;
+			}
+			ncopied += (name_len + 1);
+		} else {
+			filled = 1;
+		}
+		pos += size;
+		if (pos < xb_size - sizeof(int))
+			memcpy(&size, xb + pos, sizeof(int));
+		else
+			size = 0;
+	}
+	return ncopied;
+}
+
+int nval_hasvalues(const char *xb, int xb_size)
+{
+	return nval_used(xb, xb_size) > 0;
+}
diff --git a/fs/yaffs2/yaffs_qsort.h b/fs/yaffs2/yaffs_nameval.h
index 19083da..951e64f 100644
--- a/fs/yaffs2/yaffs_qsort.h
+++ b/fs/yaffs2/yaffs_nameval.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,11 +13,16 @@
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  */
 
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
 
-#ifndef __YAFFS_QSORT_H__
-#define __YAFFS_QSORT_H__
-
-extern void yaffs_qsort (void *const base, size_t total_elems, size_t size,
-		   int (*cmp)(const void *, const void *));
+#include "yportenv.h"
 
+int nval_del(char *xb, int xb_size, const YCHAR * name);
+int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf,
+	     int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+	     int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
 #endif
diff --git a/fs/yaffs2/yaffs_nand.c b/fs/yaffs2/yaffs_nand.c
index ce048cc..165d010 100644
--- a/fs/yaffs2/yaffs_nand.c
+++ b/fs/yaffs2/yaffs_nand.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,124 +11,110 @@
  * published by the Free Software Foundation.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-
-const char *yaffs_nand_c_version =
-    "$Id: yaffs_nand.c,v 1.7 2007/02/14 01:09:06 wookey Exp $";
-
 #include "yaffs_nand.h"
 #include "yaffs_tagscompat.h"
-#include "yaffs_tagsvalidity.h"
 
+#include "yaffs_getblockinfo.h"
+#include "yaffs_summary.h"
 
-int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
-					   __u8 * buffer,
-					   yaffs_ExtendedTags * tags)
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+			     u8 *buffer, struct yaffs_ext_tags *tags)
 {
 	int result;
-	yaffs_ExtendedTags localTags;
+	struct yaffs_ext_tags local_tags;
+	int flash_chunk = nand_chunk - dev->chunk_offset;
 
-	int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
+	dev->n_page_reads++;
 
-	/* If there are no tags provided, use local tags to get prioritised gc working */
-	if(!tags)
-		tags = &localTags;
+	/* If there are no tags provided use local tags. */
+	if (!tags)
+		tags = &local_tags;
 
-	if (dev->readChunkWithTagsFromNAND)
-		result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
-						      tags);
+	if (dev->param.read_chunk_tags_fn)
+		result =
+		    dev->param.read_chunk_tags_fn(dev, flash_chunk, buffer,
+						  tags);
 	else
-		result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
-									realignedChunkInNAND,
-									buffer,
-									tags);
-	if(tags &&
-	   tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR){
-
-		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
-		yaffs_HandleChunkError(dev,bi);
+		result = yaffs_tags_compat_rd(dev,
+					      flash_chunk, buffer, tags);
+	if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
+
+		struct yaffs_block_info *bi;
+		bi = yaffs_get_block_info(dev,
+					  nand_chunk /
+					  dev->param.chunks_per_block);
+		yaffs_handle_chunk_error(dev, bi);
 	}
-
 	return result;
 }
 
-int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
-						   int chunkInNAND,
-						   const __u8 * buffer,
-						   yaffs_ExtendedTags * tags)
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+				int nand_chunk,
+				const u8 *buffer, struct yaffs_ext_tags *tags)
 {
-	chunkInNAND -= dev->chunkOffset;
+	int result;
+	int flash_chunk = nand_chunk - dev->chunk_offset;
 
+	dev->n_page_writes++;
 
 	if (tags) {
-		tags->sequenceNumber = dev->sequenceNumber;
-		tags->chunkUsed = 1;
-		if (!yaffs_ValidateTags(tags)) {
-			T(YAFFS_TRACE_ERROR,
-			  (TSTR("Writing uninitialised tags" TENDSTR)));
-			YBUG();
-		}
-		T(YAFFS_TRACE_WRITE,
-		  (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
-		   tags->objectId, tags->chunkId));
+		tags->seq_number = dev->seq_number;
+		tags->chunk_used = 1;
+		yaffs_trace(YAFFS_TRACE_WRITE,
+			"Writing chunk %d tags %d %d",
+			nand_chunk, tags->obj_id, tags->chunk_id);
 	} else {
-		T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
-		YBUG();
+		yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
+		BUG();
+		return YAFFS_FAIL;
 	}
 
-	if (dev->writeChunkWithTagsToNAND)
-		return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
-						     tags);
+	if (dev->param.write_chunk_tags_fn)
+		result = dev->param.write_chunk_tags_fn(dev, flash_chunk,
+							buffer, tags);
 	else
-		return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
-								       chunkInNAND,
-								       buffer,
-								       tags);
+		result = yaffs_tags_compat_wr(dev, flash_chunk, buffer, tags);
+
+	yaffs_summary_add(dev, tags, nand_chunk);
+
+	return result;
 }
 
-int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
 {
-	blockNo -= dev->blockOffset;
+	block_no -= dev->block_offset;
+	if (dev->param.bad_block_fn)
+		return dev->param.bad_block_fn(dev, block_no);
 
-;
-	if (dev->markNANDBlockBad)
-		return dev->markNANDBlockBad(dev, blockNo);
-	else
-		return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
+	return yaffs_tags_compat_mark_bad(dev, block_no);
 }
 
-int yaffs_QueryInitialBlockState(yaffs_Device * dev,
-						 int blockNo,
-						 yaffs_BlockState * state,
-						 int *sequenceNumber)
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+				 int block_no,
+				 enum yaffs_block_state *state,
+				 u32 *seq_number)
 {
-	blockNo -= dev->blockOffset;
+	block_no -= dev->block_offset;
+	if (dev->param.query_block_fn)
+		return dev->param.query_block_fn(dev, block_no, state,
+						 seq_number);
 
-	if (dev->queryNANDBlock)
-		return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
-	else
-		return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
-							     state,
-							     sequenceNumber);
+	return yaffs_tags_compat_query_block(dev, block_no, state, seq_number);
 }
 
-
-int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
-				  int blockInNAND)
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block)
 {
 	int result;
 
-	blockInNAND -= dev->blockOffset;
-
-
-	dev->nBlockErasures++;
-	result = dev->eraseBlockInNAND(dev, blockInNAND);
-
+	flash_block -= dev->block_offset;
+	dev->n_erasures++;
+	result = dev->param.erase_fn(dev, flash_block);
 	return result;
 }
 
-int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
+int yaffs_init_nand(struct yaffs_dev *dev)
 {
-	return dev->initialiseNAND(dev);
+	if (dev->param.initialise_flash_fn)
+		return dev->param.initialise_flash_fn(dev);
+	return YAFFS_OK;
 }
diff --git a/fs/yaffs2/yaffs_nand.h b/fs/yaffs2/yaffs_nand.h
index f3bedcf..7134662 100644
--- a/fs/yaffs2/yaffs_nand.h
+++ b/fs/yaffs2/yaffs_nand.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -17,27 +17,22 @@
 #define __YAFFS_NAND_H__
 #include "yaffs_guts.h"
 
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+			     u8 *buffer, struct yaffs_ext_tags *tags);
 
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+			     int nand_chunk,
+			     const u8 *buffer, struct yaffs_ext_tags *tags);
 
-int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
-					   __u8 * buffer,
-					   yaffs_ExtendedTags * tags);
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no);
 
-int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
-						   int chunkInNAND,
-						   const __u8 * buffer,
-						   yaffs_ExtendedTags * tags);
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+				 int block_no,
+				 enum yaffs_block_state *state,
+				 unsigned *seq_number);
 
-int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo);
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block);
 
-int yaffs_QueryInitialBlockState(yaffs_Device * dev,
-						 int blockNo,
-						 yaffs_BlockState * state,
-						 int *sequenceNumber);
-
-int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
-				  int blockInNAND);
-
-int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev);
+int yaffs_init_nand(struct yaffs_dev *dev);
 
 #endif
diff --git a/fs/yaffs2/yaffs_nandemul2k.h b/fs/yaffs2/yaffs_nandemul2k.h
index cd2e96f..cb0c4e6 100644
--- a/fs/yaffs2/yaffs_nandemul2k.h
+++ b/fs/yaffs2/yaffs_nandemul2k.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -20,18 +20,18 @@
 
 #include "yaffs_guts.h"
 
-int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
-					int chunkInNAND, const __u8 * data,
-					yaffs_ExtendedTags * tags);
-int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_DeviceStruct *dev,
-					 int chunkInNAND, __u8 * data,
-					 yaffs_ExtendedTags * tags);
-int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
-int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
-			      yaffs_BlockState * state, int *sequenceNumber);
-int nandemul2k_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
-				int blockInNAND);
-int nandemul2k_InitialiseNAND(struct yaffs_DeviceStruct *dev);
+int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_dev *dev,
+					int nand_chunk, const u8 *data,
+					const struct yaffs_ext_tags *tags);
+int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev,
+					 int nand_chunk, u8 *data,
+					 struct yaffs_ext_tags *tags);
+int nandemul2k_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no);
+int nandemul2k_QueryNANDBlock(struct yaffs_dev *dev, int block_no,
+			      enum yaffs_block_state *state, u32 *seq_number);
+int nandemul2k_EraseBlockInNAND(struct yaffs_dev *dev,
+				int flash_block);
+int nandemul2k_InitialiseNAND(struct yaffs_dev *dev);
 int nandemul2k_GetBytesPerChunk(void);
 int nandemul2k_GetChunksPerBlock(void);
 int nandemul2k_GetNumberOfBlocks(void);
diff --git a/fs/yaffs2/yaffs_nandif.c b/fs/yaffs2/yaffs_nandif.c
new file mode 100644
index 0000000..79b00ab
--- /dev/null
+++ b/fs/yaffs2/yaffs_nandif.c
@@ -0,0 +1,251 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yportenv.h"
+#include "yaffs_guts.h"
+
+
+#include "yaffs_nandif.h"
+#include "yaffs_packedtags2.h"
+
+#include "yramsim.h"
+
+#include "yaffs_trace.h"
+#include "yaffsfs.h"
+
+
+/* NB For use with inband tags....
+ * We assume that the data buffer is of size totalBytersPerChunk so that
+ * we can also use it to load the tags.
+ */
+int ynandif_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
+				      const u8 *data,
+				      const struct yaffs_ext_tags *tags)
+{
+
+	int retval = 0;
+	struct yaffs_packed_tags2 pt;
+	void *spare;
+	unsigned spareSize = 0;
+	struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+
+	/* For yaffs2 writing there must be both data and tags.
+	 * If we're using inband tags, then the tags are stuffed into
+	 * the end of the data buffer.
+	 */
+
+	if (dev->param.inband_tags) {
+		struct yaffs_packed_tags2_tags_only *pt2tp;
+
+		pt2tp = (struct yaffs_packed_tags2_tags_only *)
+			(data + dev->data_bytes_per_chunk);
+		yaffs_pack_tags2_tags_only(pt2tp, tags);
+		spare = NULL;
+		spareSize = 0;
+	} else {
+		yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
+		spare = &pt;
+		spareSize = sizeof(struct yaffs_packed_tags2);
+	}
+
+	retval = geometry->writeChunk(dev, nand_chunk,
+				data, dev->param.total_bytes_per_chunk,
+				spare, spareSize);
+
+	return retval;
+}
+
+int ynandif_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
+				       u8 *data, struct yaffs_ext_tags *tags)
+{
+	struct yaffs_packed_tags2 pt;
+	int localData = 0;
+	void *spare = NULL;
+	unsigned spareSize;
+	int retval = 0;
+	int eccStatus; /* 0 = ok, 1 = fixed, -1 = unfixed */
+	struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+	if (!tags) {
+		spare = NULL;
+		spareSize = 0;
+	} else if (dev->param.inband_tags) {
+
+		if (!data) {
+			localData = 1;
+			data = yaffs_get_temp_buffer(dev);
+		}
+		spare = NULL;
+		spareSize = 0;
+	} else {
+		spare = &pt;
+		spareSize = sizeof(struct yaffs_packed_tags2);
+	}
+
+	retval = geometry->readChunk(dev, nand_chunk,
+				 data,
+				 data ? dev->param.total_bytes_per_chunk : 0,
+				 spare, spareSize,
+				 &eccStatus);
+
+	if (dev->param.inband_tags) {
+		if (tags) {
+			struct yaffs_packed_tags2_tags_only *pt2tp;
+			pt2tp = (struct yaffs_packed_tags2_tags_only *)
+					&data[dev->data_bytes_per_chunk];
+			yaffs_unpack_tags2_tags_only(tags, pt2tp);
+		}
+	} else {
+		if (tags)
+			yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
+	}
+
+	if (tags && tags->chunk_used) {
+		if (eccStatus < 0 ||
+		   tags->ecc_result == YAFFS_ECC_RESULT_UNFIXED)
+			tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+		else if (eccStatus > 0 ||
+			     tags->ecc_result == YAFFS_ECC_RESULT_FIXED)
+			tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
+		else
+			tags->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+	}
+
+	if (localData)
+		yaffs_release_temp_buffer(dev, data);
+
+	return retval;
+}
+
+int ynandif_MarkNANDBlockBad(struct yaffs_dev *dev, int blockId)
+{
+	struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
+
+	return geometry->markBlockBad(dev, blockId);
+}
+
+int ynandif_EraseBlockInNAND(struct yaffs_dev *dev, int blockId)
+{
+	struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
+
+	return geometry->eraseBlock(dev, blockId);
+
+}
+
+
+static int ynandif_IsBlockOk(struct yaffs_dev *dev, int blockId)
+{
+	struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
+
+	return geometry->checkBlockOk(dev, blockId);
+}
+
+int ynandif_QueryNANDBlock(struct yaffs_dev *dev, int blockId,
+		enum yaffs_block_state *state, u32 *seq_number)
+{
+	unsigned chunkNo;
+	struct yaffs_ext_tags tags;
+
+	*seq_number = 0;
+
+	chunkNo = blockId * dev->param.chunks_per_block;
+
+	if (!ynandif_IsBlockOk(dev, blockId)) {
+		*state = YAFFS_BLOCK_STATE_DEAD;
+	} else {
+		ynandif_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &tags);
+
+		if (!tags.chunk_used) {
+			*state = YAFFS_BLOCK_STATE_EMPTY;
+		} else {
+			*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
+			*seq_number = tags.seq_number;
+		}
+	}
+
+	return YAFFS_OK;
+}
+
+
+int ynandif_InitialiseNAND(struct yaffs_dev *dev)
+{
+	struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
+
+	geometry->initialise(dev);
+
+	return YAFFS_OK;
+}
+
+int ynandif_Deinitialise_flash_fn(struct yaffs_dev *dev)
+{
+	struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
+
+	geometry->deinitialise(dev);
+
+	return YAFFS_OK;
+}
+
+
+struct yaffs_dev *
+	yaffs_add_dev_from_geometry(const YCHAR *name,
+					const struct ynandif_Geometry *geometry)
+{
+	YCHAR *clonedName = malloc(sizeof(YCHAR) *
+				(strnlen(name, YAFFS_MAX_NAME_LENGTH)+1));
+	struct yaffs_dev *dev = malloc(sizeof(struct yaffs_dev));
+	struct yaffs_param *param;
+
+	if (dev && clonedName) {
+		memset(dev, 0, sizeof(struct yaffs_dev));
+		strcpy(clonedName, name);
+
+		param = &dev->param;
+
+		param->name = clonedName;
+		param->write_chunk_tags_fn = ynandif_WriteChunkWithTagsToNAND;
+		param->read_chunk_tags_fn = ynandif_ReadChunkWithTagsFromNAND;
+		param->erase_fn = ynandif_EraseBlockInNAND;
+		param->initialise_flash_fn = ynandif_InitialiseNAND;
+		param->query_block_fn = ynandif_QueryNANDBlock;
+		param->bad_block_fn = ynandif_MarkNANDBlockBad;
+		param->n_caches = 20;
+		param->start_block = geometry->start_block;
+		param->end_block   = geometry->end_block;
+		param->total_bytes_per_chunk  = geometry->dataSize;
+		param->spare_bytes_per_chunk  = geometry->spareSize;
+		param->inband_tags		  = geometry->inband_tags;
+		param->chunks_per_block	  = geometry->pagesPerBlock;
+		param->use_nand_ecc		  = geometry->hasECC;
+		param->is_yaffs2		  = geometry->useYaffs2;
+		param->n_reserved_blocks	  = 5;
+		dev->driver_context		  = (void *)geometry;
+
+		yaffs_add_device(dev);
+
+		return dev;
+	}
+
+	free(dev);
+	free(clonedName);
+
+	return NULL;
+}
diff --git a/fs/yaffs2/yaffs_nandif.h b/fs/yaffs2/yaffs_nandif.h
new file mode 100644
index 0000000..e780f7f
--- /dev/null
+++ b/fs/yaffs2/yaffs_nandif.h
@@ -0,0 +1,65 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YNANDIF_H__
+#define __YNANDIF_H__
+
+#include "yaffs_guts.h"
+
+struct ynandif_Geometry {
+	unsigned start_block;
+	unsigned end_block;
+	unsigned dataSize;
+	unsigned spareSize;
+	unsigned pagesPerBlock;
+	unsigned hasECC;
+	unsigned inband_tags;
+	unsigned useYaffs2;
+
+	int (*initialise)(struct yaffs_dev *dev);
+	int (*deinitialise)(struct yaffs_dev *dev);
+
+	int (*readChunk) (struct yaffs_dev *dev,
+					  unsigned pageId,
+					  unsigned char *data,
+					  unsigned dataLength,
+					  unsigned char *spare,
+					  unsigned spareLength,
+					  int *eccStatus);
+	/* ECC status is set to 0 for OK, 1 for fixed, -1 for unfixed. */
+
+	int (*writeChunk)(struct yaffs_dev *dev,
+					  unsigned pageId,
+					  const unsigned char *data,
+					  unsigned dataLength,
+					  const unsigned char *spare,
+					  unsigned spareLength);
+
+	int (*eraseBlock)(struct yaffs_dev *dev, unsigned blockId);
+
+	int (*checkBlockOk)(struct yaffs_dev *dev, unsigned blockId);
+	int (*markBlockBad)(struct yaffs_dev *dev, unsigned blockId);
+
+	void *privateData;
+
+};
+
+struct yaffs_dev *
+	yaffs_add_dev_from_geometry(const YCHAR *name,
+					const struct ynandif_Geometry *geometry);
+
+
+#endif
diff --git a/fs/yaffs2/yaffs_tagsvalidity.h b/fs/yaffs2/yaffs_osglue.h
index 2fd0c24..f629a4b 100644
--- a/fs/yaffs2/yaffs_tagsvalidity.h
+++ b/fs/yaffs2/yaffs_osglue.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,12 +13,29 @@
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  */
 
+/*
+ * Header file for using yaffs in an application via
+ * a direct interface.
+ */
+
+
+#ifndef __YAFFS_OSGLUE_H__
+#define __YAFFS_OSGLUE_H__
+
+
+#include "yportenv.h"
+
+void yaffsfs_Lock(void);
+void yaffsfs_Unlock(void);
+
+u32 yaffsfs_CurrentTime(void);
+
+void yaffsfs_SetError(int err);
+
+void *yaffsfs_malloc(size_t size);
+void yaffsfs_free(void *ptr);
 
-#ifndef __YAFFS_TAGS_VALIDITY_H__
-#define __YAFFS_TAGS_VALIDITY_H__
+void yaffsfs_OSInitialisation(void);
 
-#include "yaffs_guts.h"
 
-void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
-int yaffs_ValidateTags(yaffs_ExtendedTags * tags);
 #endif
diff --git a/fs/yaffs2/yaffs_packedtags1.c b/fs/yaffs2/yaffs_packedtags1.c
index a149431..dd9a331 100644
--- a/fs/yaffs2/yaffs_packedtags1.c
+++ b/fs/yaffs2/yaffs_packedtags1.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,45 +11,46 @@
  * published by the Free Software Foundation.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-
 #include "yaffs_packedtags1.h"
 #include "yportenv.h"
 
-void yaffs_PackTags1(yaffs_PackedTags1 * pt, const yaffs_ExtendedTags * t)
+static const u8 all_ff[20] = {
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff
+};
+
+void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
+		      const struct yaffs_ext_tags *t)
 {
-	pt->chunkId = t->chunkId;
-	pt->serialNumber = t->serialNumber;
-	pt->byteCount = t->byteCount;
-	pt->objectId = t->objectId;
+	pt->chunk_id = t->chunk_id;
+	pt->serial_number = t->serial_number;
+	pt->n_bytes = t->n_bytes;
+	pt->obj_id = t->obj_id;
 	pt->ecc = 0;
-	pt->deleted = (t->chunkDeleted) ? 0 : 1;
-	pt->unusedStuff = 0;
-	pt->shouldBeFF = 0xFFFFFFFF;
-
+	pt->deleted = (t->is_deleted) ? 0 : 1;
+	pt->unused_stuff = 0;
+	pt->should_be_ff = 0xffffffff;
 }
 
-void yaffs_UnpackTags1(yaffs_ExtendedTags * t, const yaffs_PackedTags1 * pt)
+void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
+			const struct yaffs_packed_tags1 *pt)
 {
-	static const __u8 allFF[] =
-	    { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-0xff };
 
-	if (memcmp(allFF, pt, sizeof(yaffs_PackedTags1))) {
-		t->blockBad = 0;
-		if (pt->shouldBeFF != 0xFFFFFFFF) {
-			t->blockBad = 1;
-		}
-		t->chunkUsed = 1;
-		t->objectId = pt->objectId;
-		t->chunkId = pt->chunkId;
-		t->byteCount = pt->byteCount;
-		t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
-		t->chunkDeleted = (pt->deleted) ? 0 : 1;
-		t->serialNumber = pt->serialNumber;
+	if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
+		t->block_bad = 0;
+		if (pt->should_be_ff != 0xffffffff)
+			t->block_bad = 1;
+		t->chunk_used = 1;
+		t->obj_id = pt->obj_id;
+		t->chunk_id = pt->chunk_id;
+		t->n_bytes = pt->n_bytes;
+		t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+		t->is_deleted = (pt->deleted) ? 0 : 1;
+		t->serial_number = pt->serial_number;
 	} else {
-		memset(t, 0, sizeof(yaffs_ExtendedTags));
-
+		memset(t, 0, sizeof(struct yaffs_ext_tags));
 	}
 }
diff --git a/fs/yaffs2/yaffs_packedtags1.h b/fs/yaffs2/yaffs_packedtags1.h
index 776c5c2..b80f0a5 100644
--- a/fs/yaffs2/yaffs_packedtags1.h
+++ b/fs/yaffs2/yaffs_packedtags1.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -20,18 +20,20 @@
 
 #include "yaffs_guts.h"
 
-typedef struct {
-	unsigned chunkId:20;
-	unsigned serialNumber:2;
-	unsigned byteCount:10;
-	unsigned objectId:18;
+struct yaffs_packed_tags1 {
+	unsigned chunk_id:20;
+	unsigned serial_number:2;
+	unsigned n_bytes:10;
+	unsigned obj_id:18;
 	unsigned ecc:12;
 	unsigned deleted:1;
-	unsigned unusedStuff:1;
-	unsigned shouldBeFF;
+	unsigned unused_stuff:1;
+	unsigned should_be_ff;
 
-} yaffs_PackedTags1;
+};
 
-void yaffs_PackTags1(yaffs_PackedTags1 * pt, const yaffs_ExtendedTags * t);
-void yaffs_UnpackTags1(yaffs_ExtendedTags * t, const yaffs_PackedTags1 * pt);
+void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
+		      const struct yaffs_ext_tags *t);
+void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
+			const struct yaffs_packed_tags1 *pt);
 #endif
diff --git a/fs/yaffs2/yaffs_packedtags2.c b/fs/yaffs2/yaffs_packedtags2.c
index 4744009..e1d18cc 100644
--- a/fs/yaffs2/yaffs_packedtags2.c
+++ b/fs/yaffs2/yaffs_packedtags2.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,12 +11,9 @@
  * published by the Free Software Foundation.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-
 #include "yaffs_packedtags2.h"
 #include "yportenv.h"
-#include "yaffs_tagsvalidity.h"
+#include "yaffs_trace.h"
 
 /* This code packs a set of extended tags into a binary structure for
  * NAND storage
@@ -27,159 +24,174 @@
  * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
  */
 
-/* Extra flags applied to chunkId */
+/* Extra flags applied to chunk_id */
 
 #define EXTRA_HEADER_INFO_FLAG	0x80000000
 #define EXTRA_SHRINK_FLAG	0x40000000
 #define EXTRA_SHADOWS_FLAG	0x20000000
 #define EXTRA_SPARE_FLAGS	0x10000000
 
-#define ALL_EXTRA_FLAGS		0xF0000000
+#define ALL_EXTRA_FLAGS		0xf0000000
 
 /* Also, the top 4 bits of the object Id are set to the object type. */
 #define EXTRA_OBJECT_TYPE_SHIFT (28)
-#define EXTRA_OBJECT_TYPE_MASK  ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
+#define EXTRA_OBJECT_TYPE_MASK  ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT)
 
-static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 * pt)
+static void yaffs_dump_packed_tags2_tags_only(
+				const struct yaffs_packed_tags2_tags_only *ptt)
 {
-	T(YAFFS_TRACE_MTD,
-	  (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
-	   pt->t.objectId, pt->t.chunkId, pt->t.byteCount,
-	   pt->t.sequenceNumber));
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"packed tags obj %d chunk %d byte %d seq %d",
+		ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number);
 }
 
-static void yaffs_DumpTags2(const yaffs_ExtendedTags * t)
+static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
 {
-	T(YAFFS_TRACE_MTD,
-	  (TSTR
-	   ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte "
-	    "%d del %d ser %d seq %d"
-	    TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
-	   t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
-	   t->sequenceNumber));
-
+	yaffs_dump_packed_tags2_tags_only(&pt->t);
 }
 
-void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t)
+static void yaffs_dump_tags2(const struct yaffs_ext_tags *t)
 {
-	pt->t.chunkId = t->chunkId;
-	pt->t.sequenceNumber = t->sequenceNumber;
-	pt->t.byteCount = t->byteCount;
-	pt->t.objectId = t->objectId;
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d",
+		t->ecc_result, t->block_bad, t->chunk_used, t->obj_id,
+		t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number,
+		t->seq_number);
 
-	if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
-		/* Store the extra header info instead */
-		/* We save the parent object in the chunkId */
-		pt->t.chunkId = EXTRA_HEADER_INFO_FLAG
-			| t->extraParentObjectId;
-		if (t->extraIsShrinkHeader) {
-			pt->t.chunkId |= EXTRA_SHRINK_FLAG;
-		}
-		if (t->extraShadows) {
-			pt->t.chunkId |= EXTRA_SHADOWS_FLAG;
-		}
+}
 
-		pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
-		pt->t.objectId |=
-		    (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
+static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t)
+{
+	if (t->chunk_id != 0 || !t->extra_available)
+		return 0;
+
+	/* Check if the file size is too long to store */
+	if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE &&
+	    (t->extra_file_size >> 31) != 0)
+		return 0;
+	return 1;
+}
 
-		if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
-			pt->t.byteCount = t->extraEquivalentObjectId;
-		} else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE) {
-			pt->t.byteCount = t->extraFileLength;
-		} else {
-			pt->t.byteCount = 0;
-		}
+void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt,
+				const struct yaffs_ext_tags *t)
+{
+	ptt->chunk_id = t->chunk_id;
+	ptt->seq_number = t->seq_number;
+	ptt->n_bytes = t->n_bytes;
+	ptt->obj_id = t->obj_id;
+
+	/* Only store extra tags for object headers.
+	 * If it is a file then only store  if the file size is short\
+	 * enough to fit.
+	 */
+	if (yaffs_check_tags_extra_packable(t)) {
+		/* Store the extra header info instead */
+		/* We save the parent object in the chunk_id */
+		ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id;
+		if (t->extra_is_shrink)
+			ptt->chunk_id |= EXTRA_SHRINK_FLAG;
+		if (t->extra_shadows)
+			ptt->chunk_id |= EXTRA_SHADOWS_FLAG;
+
+		ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+		ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT);
+
+		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+			ptt->n_bytes = t->extra_equiv_id;
+		else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+			ptt->n_bytes = (unsigned) t->extra_file_size;
+		else
+			ptt->n_bytes = 0;
 	}
 
-	yaffs_DumpPackedTags2(pt);
-	yaffs_DumpTags2(t);
-
-#ifndef YAFFS_IGNORE_TAGS_ECC
-	{
-		yaffs_ECCCalculateOther((unsigned char *)&pt->t,
-					sizeof(yaffs_PackedTags2TagsPart),
-					&pt->ecc);
-	}
-#endif
+	yaffs_dump_packed_tags2_tags_only(ptt);
+	yaffs_dump_tags2(t);
 }
 
-void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt)
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+		      const struct yaffs_ext_tags *t, int tags_ecc)
 {
+	yaffs_pack_tags2_tags_only(&pt->t, t);
 
-	memset(t, 0, sizeof(yaffs_ExtendedTags));
+	if (tags_ecc)
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
+				    sizeof(struct yaffs_packed_tags2_tags_only),
+				    &pt->ecc);
+}
 
-	yaffs_InitialiseTags(t);
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+				  struct yaffs_packed_tags2_tags_only *ptt)
+{
+	memset(t, 0, sizeof(struct yaffs_ext_tags));
+
+	if (ptt->seq_number == 0xffffffff)
+		return;
+
+	t->block_bad = 0;
+	t->chunk_used = 1;
+	t->obj_id = ptt->obj_id;
+	t->chunk_id = ptt->chunk_id;
+	t->n_bytes = ptt->n_bytes;
+	t->is_deleted = 0;
+	t->serial_number = 0;
+	t->seq_number = ptt->seq_number;
+
+	/* Do extra header info stuff */
+	if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) {
+		t->chunk_id = 0;
+		t->n_bytes = 0;
+
+		t->extra_available = 1;
+		t->extra_parent_id = ptt->chunk_id & (~(ALL_EXTRA_FLAGS));
+		t->extra_is_shrink = ptt->chunk_id & EXTRA_SHRINK_FLAG ? 1 : 0;
+		t->extra_shadows = ptt->chunk_id & EXTRA_SHADOWS_FLAG ? 1 : 0;
+		t->extra_obj_type = ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT;
+		t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+
+		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+			t->extra_equiv_id = ptt->n_bytes;
+		else
+			t->extra_file_size = ptt->n_bytes;
+	}
+	yaffs_dump_packed_tags2_tags_only(ptt);
+	yaffs_dump_tags2(t);
+}
 
-	if (pt->t.sequenceNumber != 0xFFFFFFFF) {
-		/* Page is in use */
-#ifdef YAFFS_IGNORE_TAGS_ECC
-		{
-			t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
-		}
-#else
-		{
-			yaffs_ECCOther ecc;
-			int result;
-			yaffs_ECCCalculateOther((unsigned char *)&pt->t,
-						sizeof
-						(yaffs_PackedTags2TagsPart),
-						&ecc);
-			result =
-			    yaffs_ECCCorrectOther((unsigned char *)&pt->t,
-						  sizeof
-						  (yaffs_PackedTags2TagsPart),
-						  &pt->ecc, &ecc);
-			switch(result){
-				case 0:
-					t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
-					break;
-				case 1:
-					t->eccResult = YAFFS_ECC_RESULT_FIXED;
-					break;
-				case -1:
-					t->eccResult = YAFFS_ECC_RESULT_UNFIXED;
-					break;
-				default:
-					t->eccResult = YAFFS_ECC_RESULT_UNKNOWN;
-			}
-		}
-#endif
-		t->blockBad = 0;
-		t->chunkUsed = 1;
-		t->objectId = pt->t.objectId;
-		t->chunkId = pt->t.chunkId;
-		t->byteCount = pt->t.byteCount;
-		t->chunkDeleted = 0;
-		t->serialNumber = 0;
-		t->sequenceNumber = pt->t.sequenceNumber;
-
-		/* Do extra header info stuff */
-
-		if (pt->t.chunkId & EXTRA_HEADER_INFO_FLAG) {
-			t->chunkId = 0;
-			t->byteCount = 0;
-
-			t->extraHeaderInfoAvailable = 1;
-			t->extraParentObjectId =
-			    pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
-			t->extraIsShrinkHeader =
-			    (pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
-			t->extraShadows =
-			    (pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
-			t->extraObjectType =
-			    pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
-			t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
-
-			if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
-				t->extraEquivalentObjectId = pt->t.byteCount;
-			} else {
-				t->extraFileLength = pt->t.byteCount;
-			}
+void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+			int tags_ecc)
+{
+	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+	if (pt->t.seq_number != 0xffffffff && tags_ecc) {
+		/* Chunk is in use and we need to do ECC */
+
+		struct yaffs_ecc_other ecc;
+		int result;
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
+				sizeof(struct yaffs_packed_tags2_tags_only),
+				&ecc);
+		result =
+		    yaffs_ecc_correct_other((unsigned char *)&pt->t,
+				sizeof(struct yaffs_packed_tags2_tags_only),
+				&pt->ecc, &ecc);
+		switch (result) {
+		case 0:
+			ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+			break;
+		case 1:
+			ecc_result = YAFFS_ECC_RESULT_FIXED;
+			break;
+		case -1:
+			ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+			break;
+		default:
+			ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
 		}
 	}
+	yaffs_unpack_tags2_tags_only(t, &pt->t);
 
-	yaffs_DumpPackedTags2(pt);
-	yaffs_DumpTags2(t);
+	t->ecc_result = ecc_result;
 
+	yaffs_dump_packed_tags2(pt);
+	yaffs_dump_tags2(t);
 }
diff --git a/fs/yaffs2/yaffs_packedtags2.h b/fs/yaffs2/yaffs_packedtags2.h
index c2242ff..675e719 100644
--- a/fs/yaffs2/yaffs_packedtags2.h
+++ b/fs/yaffs2/yaffs_packedtags2.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -21,18 +21,27 @@
 #include "yaffs_guts.h"
 #include "yaffs_ecc.h"
 
-typedef struct {
-	unsigned sequenceNumber;
-	unsigned objectId;
-	unsigned chunkId;
-	unsigned byteCount;
-} yaffs_PackedTags2TagsPart;
+struct yaffs_packed_tags2_tags_only {
+	unsigned seq_number;
+	unsigned obj_id;
+	unsigned chunk_id;
+	unsigned n_bytes;
+};
 
-typedef struct {
-	yaffs_PackedTags2TagsPart t;
-	yaffs_ECCOther ecc;
-} yaffs_PackedTags2;
+struct yaffs_packed_tags2 {
+	struct yaffs_packed_tags2_tags_only t;
+	struct yaffs_ecc_other ecc;
+};
 
-void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t);
-void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt);
+/* Full packed tags with ECC, used for oob tags */
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+		      const struct yaffs_ext_tags *t, int tags_ecc);
+void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+			int tags_ecc);
+
+/* Only the tags part (no ECC for use with inband tags */
+void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt,
+				const struct yaffs_ext_tags *t);
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+				  struct yaffs_packed_tags2_tags_only *pt);
 #endif
diff --git a/fs/yaffs2/yaffs_qsort.c b/fs/yaffs2/yaffs_qsort.c
index 4d56f96..afd1ffa 100644
--- a/fs/yaffs2/yaffs_qsort.c
+++ b/fs/yaffs2/yaffs_qsort.c
@@ -27,58 +27,56 @@
  * SUCH DAMAGE.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-
 #include "yportenv.h"
-//#include <linux/string.h>
+/* #include <linux/string.h> */
 
 /*
  * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
  */
-#define swapcode(TYPE, parmi, parmj, n) { 		\
-	long i = (n) / sizeof (TYPE); 			\
-	register TYPE *pi = (TYPE *) (parmi); 		\
-	register TYPE *pj = (TYPE *) (parmj); 		\
-	do { 						\
+#define swapcode(TYPE, parmi, parmj, n) do {		\
+	long i = (n) / sizeof(TYPE);			\
+	register TYPE *pi = (TYPE *) (parmi);		\
+	register TYPE *pj = (TYPE *) (parmj);		\
+	do {						\
 		register TYPE	t = *pi;		\
 		*pi++ = *pj;				\
 		*pj++ = t;				\
 	} while (--i > 0);				\
-}
+} while (0)
 
 #define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
-	es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
+	es % sizeof(long) ? 2 : es == sizeof(long) ? 0 : 1;
 
-static __inline void
+static inline void
 swapfunc(char *a, char *b, int n, int swaptype)
 {
 	if (swaptype <= 1)
-		swapcode(long, a, b, n)
+		swapcode(long, a, b, n);
 	else
-		swapcode(char, a, b, n)
+		swapcode(char, a, b, n);
 }
 
-#define swap(a, b)					\
+#define yswap(a, b) do {					\
 	if (swaptype == 0) {				\
 		long t = *(long *)(a);			\
 		*(long *)(a) = *(long *)(b);		\
 		*(long *)(b) = t;			\
 	} else						\
-		swapfunc(a, b, es, swaptype)
+		swapfunc(a, b, es, swaptype);		\
+} while (0)
 
-#define vecswap(a, b, n) 	if ((n) > 0) swapfunc(a, b, n, swaptype)
+#define vecswap(a, b, n)	if ((n) > 0) swapfunc(a, b, n, swaptype)
 
-static __inline char *
+static inline char *
 med3(char *a, char *b, char *c, int (*cmp)(const void *, const void *))
 {
 	return cmp(a, b) < 0 ?
-	       (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))
-	      :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));
+		(cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a))
+		: (cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c));
 }
 
 #ifndef min
-#define min(a,b) (((a) < (b)) ? (a) : (b))
+#define min(a, b) (((a) < (b)) ? (a) : (b))
 #endif
 
 void
@@ -95,7 +93,7 @@ loop:	SWAPINIT(a, es);
 		for (pm = (char *)a + es; pm < (char *) a + n * es; pm += es)
 			for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
 			     pl -= es)
-				swap(pl, pl - es);
+				yswap(pl, pl - es);
 		return;
 	}
 	pm = (char *)a + (n / 2) * es;
@@ -110,7 +108,7 @@ loop:	SWAPINIT(a, es);
 		}
 		pm = med3(pl, pm, pn, cmp);
 	}
-	swap(a, pm);
+	yswap(a, pm);
 	pa = pb = (char *)a + es;
 
 	pc = pd = (char *)a + (n - 1) * es;
@@ -118,7 +116,7 @@ loop:	SWAPINIT(a, es);
 		while (pb <= pc && (r = cmp(pb, a)) <= 0) {
 			if (r == 0) {
 				swap_cnt = 1;
-				swap(pa, pb);
+				yswap(pa, pb);
 				pa += es;
 			}
 			pb += es;
@@ -126,14 +124,14 @@ loop:	SWAPINIT(a, es);
 		while (pb <= pc && (r = cmp(pc, a)) >= 0) {
 			if (r == 0) {
 				swap_cnt = 1;
-				swap(pc, pd);
+				yswap(pc, pd);
 				pd -= es;
 			}
 			pc -= es;
 		}
 		if (pb > pc)
 			break;
-		swap(pb, pc);
+		yswap(pb, pc);
 		swap_cnt = 1;
 		pb += es;
 		pc -= es;
@@ -142,7 +140,7 @@ loop:	SWAPINIT(a, es);
 		for (pm = (char *) a + es; pm < (char *) a + n * es; pm += es)
 			for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
 			     pl -= es)
-				swap(pl, pl - es);
+				yswap(pl, pl - es);
 		return;
 	}
 
@@ -151,9 +149,11 @@ loop:	SWAPINIT(a, es);
 	vecswap(a, pb - r, r);
 	r = min((long)(pd - pc), (long)(pn - pd - es));
 	vecswap(pb, pn - r, r);
-	if ((r = pb - pa) > es)
+	r = pb - pa;
+	if (r > es)
 		yaffs_qsort(a, r / es, es, cmp);
-	if ((r = pd - pc) > es) {
+	r = pd - pc;
+	if (r > es) {
 		/* Iterate rather than recurse to save stack space */
 		a = pn - r;
 		n = r / es;
diff --git a/fs/yaffs2/yaffs_ramdisk.h b/fs/yaffs2/yaffs_ramdisk.h
deleted file mode 100644
index 3cff8be..0000000
--- a/fs/yaffs2/yaffs_ramdisk.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2007 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-/*
- * yaffs_ramdisk.h: yaffs ram disk component
- */
-
-#ifndef __YAFFS_RAMDISK_H__
-#define __YAFFS_RAMDISK_H__
-
-
-#include "yaffs_guts.h"
-int yramdisk_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
-int yramdisk_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags);
-int yramdisk_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
-int yramdisk_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
-int yramdisk_InitialiseNAND(yaffs_Device *dev);
-int yramdisk_MarkNANDBlockBad(yaffs_Device *dev,int blockNumber);
-int yramdisk_QueryNANDBlock(yaffs_Device *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
-#endif
diff --git a/fs/yaffs2/yaffs_summary.c b/fs/yaffs2/yaffs_summary.c
new file mode 100644
index 0000000..6f3c783
--- /dev/null
+++ b/fs/yaffs2/yaffs_summary.c
@@ -0,0 +1,313 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Summaries write the useful part of the tags for the chunks in a block into an
+ * an array which is written to the last n chunks of the block.
+ * Reading the summaries gives all the tags for the block in one read. Much
+ * faster.
+ *
+ * Chunks holding summaries are marked with tags making it look like
+ * they are part of a fake file.
+ *
+ * The summary could also be used during gc.
+ *
+ */
+
+#include "yaffs_summary.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_bitmap.h"
+
+/*
+ * The summary is built up in an array of summary tags.
+ * This gets written to the last one or two (maybe more) chunks in a block.
+ * A summary header is written as the first part of each chunk of summary data.
+ * The summary header must match or the summary is rejected.
+ */
+
+/* Summary tags don't need the sequence number because that is redundant. */
+struct yaffs_summary_tags {
+	unsigned obj_id;
+	unsigned chunk_id;
+	unsigned n_bytes;
+};
+
+/* Summary header */
+struct yaffs_summary_header {
+	unsigned version;	/* Must match current version */
+	unsigned block;		/* Must be this block */
+	unsigned seq;		/* Must be this sequence number */
+	unsigned sum;		/* Just add up all the bytes in the tags */
+};
+
+
+static void yaffs_summary_clear(struct yaffs_dev *dev)
+{
+	if (!dev->sum_tags)
+		return;
+	memset(dev->sum_tags, 0, dev->chunks_per_summary *
+		sizeof(struct yaffs_summary_tags));
+}
+
+
+void yaffs_summary_deinit(struct yaffs_dev *dev)
+{
+	kfree(dev->sum_tags);
+	dev->sum_tags = NULL;
+	kfree(dev->gc_sum_tags);
+	dev->gc_sum_tags = NULL;
+	dev->chunks_per_summary = 0;
+}
+
+int yaffs_summary_init(struct yaffs_dev *dev)
+{
+	int sum_bytes;
+	int chunks_used; /* Number of chunks used by summary */
+	int sum_tags_bytes;
+
+	sum_bytes = dev->param.chunks_per_block *
+			sizeof(struct yaffs_summary_tags);
+
+	chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/
+			(dev->data_bytes_per_chunk -
+				sizeof(struct yaffs_summary_header));
+
+	dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used;
+	sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
+	dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
+	if (!dev->sum_tags || !dev->gc_sum_tags) {
+		yaffs_summary_deinit(dev);
+		return YAFFS_FAIL;
+	}
+
+	yaffs_summary_clear(dev);
+
+	return YAFFS_OK;
+}
+
+static unsigned yaffs_summary_sum(struct yaffs_dev *dev)
+{
+	u8 *sum_buffer = (u8 *)dev->sum_tags;
+	int i;
+	unsigned sum = 0;
+
+	i = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	while (i > 0) {
+		sum += *sum_buffer;
+		sum_buffer++;
+		i--;
+	}
+
+	return sum;
+}
+
+static int yaffs_summary_write(struct yaffs_dev *dev, int blk)
+{
+	struct yaffs_ext_tags tags;
+	u8 *buffer;
+	u8 *sum_buffer = (u8 *)dev->sum_tags;
+	int n_bytes;
+	int chunk_in_nand;
+	int chunk_in_block;
+	int result;
+	int this_tx;
+	struct yaffs_summary_header hdr;
+	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+
+	buffer = yaffs_get_temp_buffer(dev);
+	n_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	memset(&tags, 0, sizeof(struct yaffs_ext_tags));
+	tags.obj_id = YAFFS_OBJECTID_SUMMARY;
+	tags.chunk_id = 1;
+	chunk_in_block = dev->chunks_per_summary;
+	chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block +
+						dev->chunks_per_summary;
+	hdr.version = YAFFS_SUMMARY_VERSION;
+	hdr.block = blk;
+	hdr.seq = bi->seq_number;
+	hdr.sum = yaffs_summary_sum(dev);
+
+	do {
+		this_tx = n_bytes;
+		if (this_tx > sum_bytes_per_chunk)
+			this_tx = sum_bytes_per_chunk;
+		memcpy(buffer, &hdr, sizeof(hdr));
+		memcpy(buffer + sizeof(hdr), sum_buffer, this_tx);
+		tags.n_bytes = this_tx + sizeof(hdr);
+		result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand,
+						buffer, &tags);
+
+		if (result != YAFFS_OK)
+			break;
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+		dev->n_free_chunks--;
+
+		n_bytes -= this_tx;
+		sum_buffer += this_tx;
+		chunk_in_nand++;
+		chunk_in_block++;
+		tags.chunk_id++;
+	} while (result == YAFFS_OK && n_bytes > 0);
+	yaffs_release_temp_buffer(dev, buffer);
+
+
+	if (result == YAFFS_OK)
+		bi->has_summary = 1;
+
+
+	return result;
+}
+
+int yaffs_summary_read(struct yaffs_dev *dev,
+			struct yaffs_summary_tags *st,
+			int blk)
+{
+	struct yaffs_ext_tags tags;
+	u8 *buffer;
+	u8 *sum_buffer = (u8 *)st;
+	int n_bytes;
+	int chunk_id;
+	int chunk_in_nand;
+	int chunk_in_block;
+	int result;
+	int this_tx;
+	struct yaffs_summary_header hdr;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
+	int sum_tags_bytes;
+
+	sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	buffer = yaffs_get_temp_buffer(dev);
+	n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary;
+	chunk_in_block = dev->chunks_per_summary;
+	chunk_in_nand = blk * dev->param.chunks_per_block +
+							dev->chunks_per_summary;
+	chunk_id = 1;
+	do {
+		this_tx = n_bytes;
+		if (this_tx > sum_bytes_per_chunk)
+			this_tx = sum_bytes_per_chunk;
+		result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand,
+						buffer, &tags);
+
+		if (tags.chunk_id != chunk_id ||
+			tags.obj_id != YAFFS_OBJECTID_SUMMARY ||
+			tags.chunk_used == 0 ||
+			tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
+			tags.n_bytes != (this_tx + sizeof(hdr)))
+				result = YAFFS_FAIL;
+		if (result != YAFFS_OK)
+			break;
+
+		if (st == dev->sum_tags) {
+			/* If we're scanning then update the block info */
+			yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+			bi->pages_in_use++;
+		}
+		memcpy(&hdr, buffer, sizeof(hdr));
+		memcpy(sum_buffer, buffer + sizeof(hdr), this_tx);
+		n_bytes -= this_tx;
+		sum_buffer += this_tx;
+		chunk_in_nand++;
+		chunk_in_block++;
+		chunk_id++;
+	} while (result == YAFFS_OK && n_bytes > 0);
+	yaffs_release_temp_buffer(dev, buffer);
+
+	if (result == YAFFS_OK) {
+		/* Verify header */
+		if (hdr.version != YAFFS_SUMMARY_VERSION ||
+		    hdr.block != blk ||
+		    hdr.seq != bi->seq_number ||
+		    hdr.sum != yaffs_summary_sum(dev))
+			result = YAFFS_FAIL;
+	}
+
+	if (st == dev->sum_tags && result == YAFFS_OK)
+		bi->has_summary = 1;
+
+	return result;
+}
+
+int yaffs_summary_add(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_nand)
+{
+	struct yaffs_packed_tags2_tags_only tags_only;
+	struct yaffs_summary_tags *sum_tags;
+	int block_in_nand = chunk_in_nand / dev->param.chunks_per_block;
+	int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block;
+
+	if (!dev->sum_tags)
+		return YAFFS_OK;
+
+	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
+		yaffs_pack_tags2_tags_only(&tags_only, tags);
+		sum_tags = &dev->sum_tags[chunk_in_block];
+		sum_tags->chunk_id = tags_only.chunk_id;
+		sum_tags->n_bytes = tags_only.n_bytes;
+		sum_tags->obj_id = tags_only.obj_id;
+
+		if (chunk_in_block == dev->chunks_per_summary - 1) {
+			/* Time to write out the summary */
+			yaffs_summary_write(dev, block_in_nand);
+			yaffs_summary_clear(dev);
+			yaffs_skip_rest_of_block(dev);
+		}
+	}
+	return YAFFS_OK;
+}
+
+int yaffs_summary_fetch(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block)
+{
+	struct yaffs_packed_tags2_tags_only tags_only;
+	struct yaffs_summary_tags *sum_tags;
+	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
+		sum_tags = &dev->sum_tags[chunk_in_block];
+		tags_only.chunk_id = sum_tags->chunk_id;
+		tags_only.n_bytes = sum_tags->n_bytes;
+		tags_only.obj_id = sum_tags->obj_id;
+		yaffs_unpack_tags2_tags_only(tags, &tags_only);
+		return YAFFS_OK;
+	}
+	return YAFFS_FAIL;
+}
+
+void yaffs_summary_gc(struct yaffs_dev *dev, int blk)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+	int i;
+
+	if (!bi->has_summary)
+		return;
+
+	for (i = dev->chunks_per_summary;
+	     i < dev->param.chunks_per_block;
+	     i++) {
+		if (yaffs_check_chunk_bit(dev, blk, i)) {
+			yaffs_clear_chunk_bit(dev, blk, i);
+			bi->pages_in_use--;
+			dev->n_free_chunks++;
+		}
+	}
+}
diff --git a/fs/yaffs2/yaffs_summary.h b/fs/yaffs2/yaffs_summary.h
new file mode 100644
index 0000000..be141d0
--- /dev/null
+++ b/fs/yaffs2/yaffs_summary.h
@@ -0,0 +1,37 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_SUMMARY_H__
+#define __YAFFS_SUMMARY_H__
+
+#include "yaffs_packedtags2.h"
+
+
+int yaffs_summary_init(struct yaffs_dev *dev);
+void yaffs_summary_deinit(struct yaffs_dev *dev);
+
+int yaffs_summary_add(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block);
+int yaffs_summary_fetch(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block);
+int yaffs_summary_read(struct yaffs_dev *dev,
+			struct yaffs_summary_tags *st,
+			int blk);
+void yaffs_summary_gc(struct yaffs_dev *dev, int blk);
+
+
+#endif
diff --git a/fs/yaffs2/yaffs_tagscompat.c b/fs/yaffs2/yaffs_tagscompat.c
index e872323..9ac5896 100644
--- a/fs/yaffs2/yaffs_tagscompat.c
+++ b/fs/yaffs2/yaffs_tagscompat.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,63 +11,27 @@
  * published by the Free Software Foundation.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-
 #include "yaffs_guts.h"
 #include "yaffs_tagscompat.h"
 #include "yaffs_ecc.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_trace.h"
+
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
 
-static void yaffs_HandleReadDataError(yaffs_Device * dev, int chunkInNAND);
-#ifdef NOTYET
-static void yaffs_CheckWrittenBlock(yaffs_Device * dev, int chunkInNAND);
-static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
-				     const __u8 * data,
-				     const yaffs_Spare * spare);
-static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
-				    const yaffs_Spare * spare);
-static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND);
-#endif
-
-static const char yaffs_countBitsTable[256] = {
-	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
-	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
-	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
-	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
-	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
-	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
-	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
-	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
-	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
-	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
-	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
-	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
-	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
-	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
-	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
-	4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
-};
-
-int yaffs_CountBits(__u8 x)
-{
-	int retVal;
-	retVal = yaffs_countBitsTable[x];
-	return retVal;
-}
 
 /********** Tags ECC calculations  *********/
 
-void yaffs_CalcECC(const __u8 * data, yaffs_Spare * spare)
+void yaffs_calc_ecc(const u8 *data, struct yaffs_spare *spare)
 {
-	yaffs_ECCCalculate(data, spare->ecc1);
-	yaffs_ECCCalculate(&data[256], spare->ecc2);
+	yaffs_ecc_calc(data, spare->ecc1);
+	yaffs_ecc_calc(&data[256], spare->ecc2);
 }
 
-void yaffs_CalcTagsECC(yaffs_Tags * tags)
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
 {
 	/* Calculate an ecc */
-
-	unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
+	unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
 	unsigned i, j;
 	unsigned ecc = 0;
 	unsigned bit = 0;
@@ -77,34 +41,31 @@ void yaffs_CalcTagsECC(yaffs_Tags * tags)
 	for (i = 0; i < 8; i++) {
 		for (j = 1; j & 0xff; j <<= 1) {
 			bit++;
-			if (b[i] & j) {
+			if (b[i] & j)
 				ecc ^= bit;
-			}
 		}
 	}
-
 	tags->ecc = ecc;
-
 }
 
-int yaffs_CheckECCOnTags(yaffs_Tags * tags)
+int yaffs_check_tags_ecc(struct yaffs_tags *tags)
 {
 	unsigned ecc = tags->ecc;
 
-	yaffs_CalcTagsECC(tags);
+	yaffs_calc_tags_ecc(tags);
 
 	ecc ^= tags->ecc;
 
 	if (ecc && ecc <= 64) {
 		/* TODO: Handle the failure better. Retire? */
-		unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
+		unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
 
 		ecc--;
 
 		b[ecc / 8] ^= (1 << (ecc & 7));
 
 		/* Now recvalc the ecc */
-		yaffs_CalcTagsECC(tags);
+		yaffs_calc_tags_ecc(tags);
 
 		return 1;	/* recovered error */
 	} else if (ecc) {
@@ -112,235 +73,202 @@ int yaffs_CheckECCOnTags(yaffs_Tags * tags)
 		/* TODO Need to do somethiong here */
 		return -1;	/* unrecovered error */
 	}
-
 	return 0;
 }
 
 /********** Tags **********/
 
-static void yaffs_LoadTagsIntoSpare(yaffs_Spare * sparePtr,
-				    yaffs_Tags * tagsPtr)
+static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
+				     struct yaffs_tags *tags_ptr)
 {
-	yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
-
-	yaffs_CalcTagsECC(tagsPtr);
-
-	sparePtr->tagByte0 = tu->asBytes[0];
-	sparePtr->tagByte1 = tu->asBytes[1];
-	sparePtr->tagByte2 = tu->asBytes[2];
-	sparePtr->tagByte3 = tu->asBytes[3];
-	sparePtr->tagByte4 = tu->asBytes[4];
-	sparePtr->tagByte5 = tu->asBytes[5];
-	sparePtr->tagByte6 = tu->asBytes[6];
-	sparePtr->tagByte7 = tu->asBytes[7];
+	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
+
+	yaffs_calc_tags_ecc(tags_ptr);
+
+	spare_ptr->tb0 = tu->as_bytes[0];
+	spare_ptr->tb1 = tu->as_bytes[1];
+	spare_ptr->tb2 = tu->as_bytes[2];
+	spare_ptr->tb3 = tu->as_bytes[3];
+	spare_ptr->tb4 = tu->as_bytes[4];
+	spare_ptr->tb5 = tu->as_bytes[5];
+	spare_ptr->tb6 = tu->as_bytes[6];
+	spare_ptr->tb7 = tu->as_bytes[7];
 }
 
-static void yaffs_GetTagsFromSpare(yaffs_Device * dev, yaffs_Spare * sparePtr,
-				   yaffs_TagsUnion *tu)
+static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
+				      struct yaffs_spare *spare_ptr,
+				      struct yaffs_tags *tags_ptr)
 {
+	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
 	int result;
 
-	tu->asBytes[0] = sparePtr->tagByte0;
-	tu->asBytes[1] = sparePtr->tagByte1;
-	tu->asBytes[2] = sparePtr->tagByte2;
-	tu->asBytes[3] = sparePtr->tagByte3;
-	tu->asBytes[4] = sparePtr->tagByte4;
-	tu->asBytes[5] = sparePtr->tagByte5;
-	tu->asBytes[6] = sparePtr->tagByte6;
-	tu->asBytes[7] = sparePtr->tagByte7;
-
-	result = yaffs_CheckECCOnTags(&tu->asTags);
-	if (result > 0) {
-		dev->tagsEccFixed++;
-	} else if (result < 0) {
-		dev->tagsEccUnfixed++;
-	}
+	tu->as_bytes[0] = spare_ptr->tb0;
+	tu->as_bytes[1] = spare_ptr->tb1;
+	tu->as_bytes[2] = spare_ptr->tb2;
+	tu->as_bytes[3] = spare_ptr->tb3;
+	tu->as_bytes[4] = spare_ptr->tb4;
+	tu->as_bytes[5] = spare_ptr->tb5;
+	tu->as_bytes[6] = spare_ptr->tb6;
+	tu->as_bytes[7] = spare_ptr->tb7;
+
+	result = yaffs_check_tags_ecc(tags_ptr);
+	if (result > 0)
+		dev->n_tags_ecc_fixed++;
+	else if (result < 0)
+		dev->n_tags_ecc_unfixed++;
 }
 
-static void yaffs_SpareInitialise(yaffs_Spare * spare)
+static void yaffs_spare_init(struct yaffs_spare *spare)
 {
-	memset(spare, 0xFF, sizeof(yaffs_Spare));
+	memset(spare, 0xff, sizeof(struct yaffs_spare));
 }
 
-static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,
-				  int chunkInNAND, const __u8 * data,
-				  yaffs_Spare * spare)
+static int yaffs_wr_nand(struct yaffs_dev *dev,
+			 int nand_chunk, const u8 *data,
+			 struct yaffs_spare *spare)
 {
-	if (chunkInNAND < dev->startBlock * dev->nChunksPerBlock) {
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR("**>> yaffs chunk %d is not valid" TENDSTR),
-		   chunkInNAND));
+	if (nand_chunk < dev->param.start_block * dev->param.chunks_per_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>> yaffs chunk %d is not valid",
+			nand_chunk);
 		return YAFFS_FAIL;
 	}
 
-	dev->nPageWrites++;
-	return dev->writeChunkToNAND(dev, chunkInNAND, data, spare);
+	return dev->param.write_chunk_fn(dev, nand_chunk, data, spare);
 }
 
-static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
-				   int chunkInNAND,
-				   __u8 * data,
-				   yaffs_Spare * spare,
-				   yaffs_ECCResult * eccResult,
-				   int doErrorCorrection)
+static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
+			       int nand_chunk,
+			       u8 *data,
+			       struct yaffs_spare *spare,
+			       enum yaffs_ecc_result *ecc_result,
+			       int correct_errors)
 {
-	int retVal;
-	yaffs_Spare localSpare;
-
-	dev->nPageReads++;
+	int ret_val;
+	struct yaffs_spare local_spare;
 
-	if (!spare && data) {
+	if (!spare) {
 		/* If we don't have a real spare, then we use a local one. */
 		/* Need this for the calculation of the ecc */
-		spare = &localSpare;
+		spare = &local_spare;
 	}
 
-	if (!dev->useNANDECC) {
-		retVal = dev->readChunkFromNAND(dev, chunkInNAND, data, spare);
-		if (data && doErrorCorrection) {
+	if (!dev->param.use_nand_ecc) {
+		ret_val =
+		    dev->param.read_chunk_fn(dev, nand_chunk, data, spare);
+		if (data && correct_errors) {
 			/* Do ECC correction */
 			/* Todo handle any errors */
-			int eccResult1, eccResult2;
-			__u8 calcEcc[3];
-
-			yaffs_ECCCalculate(data, calcEcc);
-			eccResult1 =
-			    yaffs_ECCCorrect(data, spare->ecc1, calcEcc);
-			yaffs_ECCCalculate(&data[256], calcEcc);
-			eccResult2 =
-			    yaffs_ECCCorrect(&data[256], spare->ecc2, calcEcc);
-
-			if (eccResult1 > 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>yaffs ecc error fix performed on chunk %d:0"
-				    TENDSTR), chunkInNAND));
-				dev->eccFixed++;
-			} else if (eccResult1 < 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>yaffs ecc error unfixed on chunk %d:0"
-				    TENDSTR), chunkInNAND));
-				dev->eccUnfixed++;
+			int ecc_result1, ecc_result2;
+			u8 calc_ecc[3];
+
+			yaffs_ecc_calc(data, calc_ecc);
+			ecc_result1 =
+			    yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
+			yaffs_ecc_calc(&data[256], calc_ecc);
+			ecc_result2 =
+			    yaffs_ecc_correct(&data[256], spare->ecc2,
+					      calc_ecc);
+
+			if (ecc_result1 > 0) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>yaffs ecc error fix performed on chunk %d:0",
+					nand_chunk);
+				dev->n_ecc_fixed++;
+			} else if (ecc_result1 < 0) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>yaffs ecc error unfixed on chunk %d:0",
+					nand_chunk);
+				dev->n_ecc_unfixed++;
 			}
 
-			if (eccResult2 > 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>yaffs ecc error fix performed on chunk %d:1"
-				    TENDSTR), chunkInNAND));
-				dev->eccFixed++;
-			} else if (eccResult2 < 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>yaffs ecc error unfixed on chunk %d:1"
-				    TENDSTR), chunkInNAND));
-				dev->eccUnfixed++;
+			if (ecc_result2 > 0) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>yaffs ecc error fix performed on chunk %d:1",
+					nand_chunk);
+				dev->n_ecc_fixed++;
+			} else if (ecc_result2 < 0) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>yaffs ecc error unfixed on chunk %d:1",
+					nand_chunk);
+				dev->n_ecc_unfixed++;
 			}
 
-			if (eccResult1 || eccResult2) {
+			if (ecc_result1 || ecc_result2) {
 				/* We had a data problem on this page */
-				yaffs_HandleReadDataError(dev, chunkInNAND);
+				yaffs_handle_rd_data_error(dev, nand_chunk);
 			}
 
-			if (eccResult1 < 0 || eccResult2 < 0)
-				*eccResult = YAFFS_ECC_RESULT_UNFIXED;
-			else if (eccResult1 > 0 || eccResult2 > 0)
-				*eccResult = YAFFS_ECC_RESULT_FIXED;
+			if (ecc_result1 < 0 || ecc_result2 < 0)
+				*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+			else if (ecc_result1 > 0 || ecc_result2 > 0)
+				*ecc_result = YAFFS_ECC_RESULT_FIXED;
 			else
-				*eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+				*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
 		}
 	} else {
 		/* Must allocate enough memory for spare+2*sizeof(int) */
 		/* for ecc results from device. */
-		struct yaffs_NANDSpare nspare;
-		retVal =
-		    dev->readChunkFromNAND(dev, chunkInNAND, data,
-					   (yaffs_Spare *) & nspare);
-		memcpy(spare, &nspare, sizeof(yaffs_Spare));
-		if (data && doErrorCorrection) {
+		struct yaffs_nand_spare nspare;
+
+		memset(&nspare, 0, sizeof(nspare));
+
+		ret_val = dev->param.read_chunk_fn(dev, nand_chunk, data,
+						   (struct yaffs_spare *)
+						   &nspare);
+		memcpy(spare, &nspare, sizeof(struct yaffs_spare));
+		if (data && correct_errors) {
 			if (nspare.eccres1 > 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>mtd ecc error fix performed on chunk %d:0"
-				    TENDSTR), chunkInNAND));
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>mtd ecc error fix performed on chunk %d:0",
+					nand_chunk);
 			} else if (nspare.eccres1 < 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>mtd ecc error unfixed on chunk %d:0"
-				    TENDSTR), chunkInNAND));
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>mtd ecc error unfixed on chunk %d:0",
+					nand_chunk);
 			}
 
 			if (nspare.eccres2 > 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>mtd ecc error fix performed on chunk %d:1"
-				    TENDSTR), chunkInNAND));
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>mtd ecc error fix performed on chunk %d:1",
+					nand_chunk);
 			} else if (nspare.eccres2 < 0) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("**>>mtd ecc error unfixed on chunk %d:1"
-				    TENDSTR), chunkInNAND));
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"**>>mtd ecc error unfixed on chunk %d:1",
+					nand_chunk);
 			}
 
 			if (nspare.eccres1 || nspare.eccres2) {
 				/* We had a data problem on this page */
-				yaffs_HandleReadDataError(dev, chunkInNAND);
+				yaffs_handle_rd_data_error(dev, nand_chunk);
 			}
 
 			if (nspare.eccres1 < 0 || nspare.eccres2 < 0)
-				*eccResult = YAFFS_ECC_RESULT_UNFIXED;
+				*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
 			else if (nspare.eccres1 > 0 || nspare.eccres2 > 0)
-				*eccResult = YAFFS_ECC_RESULT_FIXED;
+				*ecc_result = YAFFS_ECC_RESULT_FIXED;
 			else
-				*eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+				*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
 
 		}
 	}
-	return retVal;
+	return ret_val;
 }
 
-#ifdef NOTYET
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
-				  int chunkInNAND)
-{
-
-	static int init = 0;
-	static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
-	static __u8 data[YAFFS_BYTES_PER_CHUNK];
-	/* Might as well always allocate the larger size for */
-	/* dev->useNANDECC == true; */
-	static __u8 spare[sizeof(struct yaffs_NANDSpare)];
-
-	dev->readChunkFromNAND(dev, chunkInNAND, data, (yaffs_Spare *) spare);
-
-	if (!init) {
-		memset(cmpbuf, 0xff, YAFFS_BYTES_PER_CHUNK);
-		init = 1;
-	}
-
-	if (memcmp(cmpbuf, data, YAFFS_BYTES_PER_CHUNK))
-		return YAFFS_FAIL;
-	if (memcmp(cmpbuf, spare, 16))
-		return YAFFS_FAIL;
-
-	return YAFFS_OK;
-
-}
-#endif
-
 /*
  * Functions for robustisizing
  */
 
-static void yaffs_HandleReadDataError(yaffs_Device * dev, int chunkInNAND)
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
 {
-	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+	int flash_block = nand_chunk / dev->param.chunks_per_block;
 
 	/* Mark the block for retirement */
-	yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
-	T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-	  (TSTR("**>>Block %d marked for retirement" TENDSTR), blockInNAND));
+	yaffs_get_block_info(dev, flash_block + dev->block_offset)->
+		needs_retiring = 1;
+	yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		"**>>Block %d marked for retirement",
+		flash_block);
 
 	/* TODO:
 	 * Just do a garbage collection on the affected block
@@ -349,184 +277,131 @@ static void yaffs_HandleReadDataError(yaffs_Device * dev, int chunkInNAND)
 	 */
 }
 
-#ifdef NOTYET
-static void yaffs_CheckWrittenBlock(yaffs_Device * dev, int chunkInNAND)
+int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 const u8 *data, const struct yaffs_ext_tags *ext_tags)
 {
-}
+	struct yaffs_spare spare;
+	struct yaffs_tags tags;
 
-static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
-				     const __u8 * data,
-				     const yaffs_Spare * spare)
-{
-}
+	yaffs_spare_init(&spare);
 
-static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
-				    const yaffs_Spare * spare)
-{
-}
+	if (ext_tags->is_deleted)
+		spare.page_status = 0;
+	else {
+		tags.obj_id = ext_tags->obj_id;
+		tags.chunk_id = ext_tags->chunk_id;
 
-static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND)
-{
-	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
-
-	/* Mark the block for retirement */
-	yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
-	/* Delete the chunk */
-	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-}
-
-static int yaffs_VerifyCompare(const __u8 * d0, const __u8 * d1,
-			       const yaffs_Spare * s0, const yaffs_Spare * s1)
-{
-
-	if (memcmp(d0, d1, YAFFS_BYTES_PER_CHUNK) != 0 ||
-	    s0->tagByte0 != s1->tagByte0 ||
-	    s0->tagByte1 != s1->tagByte1 ||
-	    s0->tagByte2 != s1->tagByte2 ||
-	    s0->tagByte3 != s1->tagByte3 ||
-	    s0->tagByte4 != s1->tagByte4 ||
-	    s0->tagByte5 != s1->tagByte5 ||
-	    s0->tagByte6 != s1->tagByte6 ||
-	    s0->tagByte7 != s1->tagByte7 ||
-	    s0->ecc1[0] != s1->ecc1[0] ||
-	    s0->ecc1[1] != s1->ecc1[1] ||
-	    s0->ecc1[2] != s1->ecc1[2] ||
-	    s0->ecc2[0] != s1->ecc2[0] ||
-	    s0->ecc2[1] != s1->ecc2[1] || s0->ecc2[2] != s1->ecc2[2]) {
-		return 0;
-	}
+		tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1);
 
-	return 1;
-}
-#endif				/* NOTYET */
-
-int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device * dev,
-						    int chunkInNAND,
-						    const __u8 * data,
-						    const yaffs_ExtendedTags *
-						    eTags)
-{
-	yaffs_Spare spare;
-	yaffs_Tags tags;
-
-	yaffs_SpareInitialise(&spare);
+		if (dev->data_bytes_per_chunk >= 1024)
+			tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
+		else
+			tags.n_bytes_msb = 3;
 
-	if (eTags->chunkDeleted) {
-		spare.pageStatus = 0;
-	} else {
-		tags.objectId = eTags->objectId;
-		tags.chunkId = eTags->chunkId;
-		tags.byteCount = eTags->byteCount;
-		tags.serialNumber = eTags->serialNumber;
+		tags.serial_number = ext_tags->serial_number;
 
-		if (!dev->useNANDECC && data) {
-			yaffs_CalcECC(data, &spare);
-		}
-		yaffs_LoadTagsIntoSpare(&spare, &tags);
+		if (!dev->param.use_nand_ecc && data)
+			yaffs_calc_ecc(data, &spare);
 
+		yaffs_load_tags_to_spare(&spare, &tags);
 	}
-
-	return yaffs_WriteChunkToNAND(dev, chunkInNAND, data, &spare);
+	return yaffs_wr_nand(dev, nand_chunk, data, &spare);
 }
 
-int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device * dev,
-						     int chunkInNAND,
-						     __u8 * data,
-						     yaffs_ExtendedTags * eTags)
+int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 u8 *data, struct yaffs_ext_tags *ext_tags)
 {
-
-	yaffs_Spare spare;
-	yaffs_TagsUnion tags;
-	yaffs_ECCResult eccResult;
-
-	static yaffs_Spare spareFF;
+	struct yaffs_spare spare;
+	struct yaffs_tags tags;
+	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+	static struct yaffs_spare spare_ff;
 	static int init;
+	int deleted;
 
 	if (!init) {
-		memset(&spareFF, 0xFF, sizeof(spareFF));
+		memset(&spare_ff, 0xff, sizeof(spare_ff));
 		init = 1;
 	}
 
-	if (yaffs_ReadChunkFromNAND
-	    (dev, chunkInNAND, data, &spare, &eccResult, 1)) {
-		/* eTags may be NULL */
-		if (eTags) {
-
-			int deleted =
-			    (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
-
-			eTags->chunkDeleted = deleted;
-			eTags->eccResult = eccResult;
-			eTags->blockBad = 0;	/* We're reading it */
-			/* therefore it is not a bad block */
-			eTags->chunkUsed =
-			    (memcmp(&spareFF, &spare, sizeof(spareFF)) !=
-			     0) ? 1 : 0;
-
-			if (eTags->chunkUsed) {
-				yaffs_GetTagsFromSpare(dev, &spare, &tags);
-
-				eTags->objectId = tags.asTags.objectId;
-				eTags->chunkId = tags.asTags.chunkId;
-				eTags->byteCount = tags.asTags.byteCount;
-				eTags->serialNumber = tags.asTags.serialNumber;
-			}
-		}
+	if (!yaffs_rd_chunk_nand(dev, nand_chunk,
+					data, &spare, &ecc_result, 1))
+		return YAFFS_FAIL;
 
+	/* ext_tags may be NULL */
+	if (!ext_tags)
 		return YAFFS_OK;
-	} else {
-		return YAFFS_FAIL;
+
+	deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;
+
+	ext_tags->is_deleted = deleted;
+	ext_tags->ecc_result = ecc_result;
+	ext_tags->block_bad = 0;	/* We're reading it */
+	/* therefore it is not a bad block */
+	ext_tags->chunk_used =
+		memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0;
+
+	if (ext_tags->chunk_used) {
+		yaffs_get_tags_from_spare(dev, &spare, &tags);
+		ext_tags->obj_id = tags.obj_id;
+		ext_tags->chunk_id = tags.chunk_id;
+		ext_tags->n_bytes = tags.n_bytes_lsb;
+
+		if (dev->data_bytes_per_chunk >= 1024)
+			ext_tags->n_bytes |=
+				(((unsigned)tags.n_bytes_msb) << 10);
+
+		ext_tags->serial_number = tags.serial_number;
 	}
+
+	return YAFFS_OK;
 }
 
-int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev,
-					    int blockInNAND)
+int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
 {
+	struct yaffs_spare spare;
 
-	yaffs_Spare spare;
-
-	memset(&spare, 0xff, sizeof(yaffs_Spare));
+	memset(&spare, 0xff, sizeof(struct yaffs_spare));
 
-	spare.blockStatus = 'Y';
+	spare.block_status = 'Y';
 
-	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL,
-			       &spare);
-	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1,
-			       NULL, &spare);
+	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
+		      &spare);
+	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
+		      NULL, &spare);
 
 	return YAFFS_OK;
-
 }
 
-int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev,
-					  int blockNo, yaffs_BlockState *
-					  state,
-					  int *sequenceNumber)
+int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+				  int block_no,
+				  enum yaffs_block_state *state,
+				  u32 *seq_number)
 {
-
-	yaffs_Spare spare0, spare1;
-	static yaffs_Spare spareFF;
+	struct yaffs_spare spare0, spare1;
+	static struct yaffs_spare spare_ff;
 	static int init;
-	yaffs_ECCResult dummy;
+	enum yaffs_ecc_result dummy;
 
 	if (!init) {
-		memset(&spareFF, 0xFF, sizeof(spareFF));
+		memset(&spare_ff, 0xff, sizeof(spare_ff));
 		init = 1;
 	}
 
-	*sequenceNumber = 0;
+	*seq_number = 0;
 
-	yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock, NULL,
-				&spare0, &dummy, 1);
-	yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock + 1, NULL,
-				&spare1, &dummy, 1);
+	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, NULL,
+			    &spare0, &dummy, 1);
+	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
+			    NULL, &spare1, &dummy, 1);
 
-	if (yaffs_CountBits(spare0.blockStatus & spare1.blockStatus) < 7)
+	if (hweight8(spare0.block_status & spare1.block_status) < 7)
 		*state = YAFFS_BLOCK_STATE_DEAD;
-	else if (memcmp(&spareFF, &spare0, sizeof(spareFF)) == 0)
+	else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
 		*state = YAFFS_BLOCK_STATE_EMPTY;
 	else
-		*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
 
 	return YAFFS_OK;
 }
diff --git a/fs/yaffs2/yaffs_tagscompat.h b/fs/yaffs2/yaffs_tagscompat.h
index a61e3ba..b3c6655 100644
--- a/fs/yaffs2/yaffs_tagscompat.h
+++ b/fs/yaffs2/yaffs_tagscompat.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -17,24 +17,20 @@
 #define __YAFFS_TAGSCOMPAT_H__
 
 #include "yaffs_guts.h"
-int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device * dev,
-						    int chunkInNAND,
-						    const __u8 * data,
-						    const yaffs_ExtendedTags *
-						    tags);
-int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device * dev,
-						     int chunkInNAND,
-						     __u8 * data,
-						     yaffs_ExtendedTags *
-						     tags);
-int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev,
-					    int blockNo);
-int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev,
-					  int blockNo, yaffs_BlockState *
-					  state, int *sequenceNumber);
+int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 const u8 *data, const struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 u8 *data, struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no);
+int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+				  int block_no,
+				  enum yaffs_block_state *state,
+				  u32 *seq_number);
 
-void yaffs_CalcTagsECC(yaffs_Tags * tags);
-int yaffs_CheckECCOnTags(yaffs_Tags * tags);
-int yaffs_CountBits(__u8 byte);
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags);
+int yaffs_check_tags_ecc(struct yaffs_tags *tags);
+int yaffs_count_bits(u8 byte);
 
 #endif
diff --git a/fs/yaffs2/yaffs_tagsvalidity.c b/fs/yaffs2/yaffs_tagsvalidity.c
deleted file mode 100644
index f588d3a..0000000
--- a/fs/yaffs2/yaffs_tagsvalidity.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2007 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/* XXX U-BOOT XXX */
-#include <common.h>
-
-#include "yaffs_tagsvalidity.h"
-
-void yaffs_InitialiseTags(yaffs_ExtendedTags * tags)
-{
-	memset(tags, 0, sizeof(yaffs_ExtendedTags));
-	tags->validMarker0 = 0xAAAAAAAA;
-	tags->validMarker1 = 0x55555555;
-}
-
-int yaffs_ValidateTags(yaffs_ExtendedTags * tags)
-{
-	return (tags->validMarker0 == 0xAAAAAAAA &&
-		tags->validMarker1 == 0x55555555);
-
-}
diff --git a/fs/yaffs2/yaffs_trace.h b/fs/yaffs2/yaffs_trace.h
new file mode 100644
index 0000000..fd26054
--- /dev/null
+++ b/fs/yaffs2/yaffs_trace.h
@@ -0,0 +1,57 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YTRACE_H__
+#define __YTRACE_H__
+
+extern unsigned int yaffs_trace_mask;
+extern unsigned int yaffs_wr_attempts;
+
+/*
+ * Tracing flags.
+ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
+ */
+
+#define YAFFS_TRACE_OS			0x00000002
+#define YAFFS_TRACE_ALLOCATE		0x00000004
+#define YAFFS_TRACE_SCAN		0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
+#define YAFFS_TRACE_ERASE		0x00000020
+#define YAFFS_TRACE_GC			0x00000040
+#define YAFFS_TRACE_WRITE		0x00000080
+#define YAFFS_TRACE_TRACING		0x00000100
+#define YAFFS_TRACE_DELETION		0x00000200
+#define YAFFS_TRACE_BUFFERS		0x00000400
+#define YAFFS_TRACE_NANDACCESS		0x00000800
+#define YAFFS_TRACE_GC_DETAIL		0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
+#define YAFFS_TRACE_MTD			0x00004000
+#define YAFFS_TRACE_CHECKPOINT		0x00008000
+
+#define YAFFS_TRACE_VERIFY		0x00010000
+#define YAFFS_TRACE_VERIFY_NAND		0x00020000
+#define YAFFS_TRACE_VERIFY_FULL		0x00040000
+#define YAFFS_TRACE_VERIFY_ALL		0x000f0000
+
+#define YAFFS_TRACE_SYNC		0x00100000
+#define YAFFS_TRACE_BACKGROUND		0x00200000
+#define YAFFS_TRACE_LOCK		0x00400000
+#define YAFFS_TRACE_MOUNT		0x00800000
+
+#define YAFFS_TRACE_ERROR		0x40000000
+#define YAFFS_TRACE_BUG			0x80000000
+#define YAFFS_TRACE_ALWAYS		0xf0000000
+
+#endif
diff --git a/fs/yaffs2/yaffs_uboot_glue.c b/fs/yaffs2/yaffs_uboot_glue.c
new file mode 100644
index 0000000..e113e40
--- /dev/null
+++ b/fs/yaffs2/yaffs_uboot_glue.c
@@ -0,0 +1,464 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * yaffscfg.c  The configuration for the "direct" use of yaffs.
+ *
+ * This is set up for u-boot.
+ *
+ * This version now uses the ydevconfig mechanism to set up partitions.
+ */
+
+#include <common.h>
+
+#include <config.h>
+#include "nand.h"
+#include "yaffscfg.h"
+#include "yaffsfs.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif2.h"
+#if 0
+#include <errno.h>
+#else
+#include "malloc.h"
+#endif
+
+unsigned yaffs_trace_mask = 0x0; /* Disable logging */
+static int yaffs_errno;
+
+
+void yaffs_bug_fn(const char *fn, int n)
+{
+	printf("yaffs bug at %s:%d\n", fn, n);
+}
+
+void *yaffsfs_malloc(size_t x)
+{
+	return malloc(x);
+}
+
+void yaffsfs_free(void *x)
+{
+	free(x);
+}
+
+void yaffsfs_SetError(int err)
+{
+	yaffs_errno = err;
+}
+
+int yaffsfs_GetLastError(void)
+{
+	return yaffs_errno;
+}
+
+
+int yaffsfs_GetError(void)
+{
+	return yaffs_errno;
+}
+
+void yaffsfs_Lock(void)
+{
+}
+
+void yaffsfs_Unlock(void)
+{
+}
+
+__u32 yaffsfs_CurrentTime(void)
+{
+	return 0;
+}
+
+void *yaffs_malloc(size_t size)
+{
+	return malloc(size);
+}
+
+void yaffs_free(void *ptr)
+{
+	free(ptr);
+}
+
+void yaffsfs_LocalInitialisation(void)
+{
+	/* No locking used */
+}
+
+
+static const char *yaffs_file_type_str(struct yaffs_stat *stat)
+{
+	switch (stat->st_mode & S_IFMT) {
+	case S_IFREG: return "regular file";
+	case S_IFDIR: return "directory";
+	case S_IFLNK: return "symlink";
+	default: return "unknown";
+	}
+}
+
+static const char *yaffs_error_str(void)
+{
+	int error = yaffsfs_GetLastError();
+
+	if (error < 0)
+		error = -error;
+
+	switch (error) {
+	case EBUSY: return "Busy";
+	case ENODEV: return "No such device";
+	case EINVAL: return "Invalid parameter";
+	case ENFILE: return "Too many open files";
+	case EBADF:  return "Bad handle";
+	case EACCES: return "Wrong permissions";
+	case EXDEV:  return "Not on same device";
+	case ENOENT: return "No such entry";
+	case ENOSPC: return "Device full";
+	case EROFS:  return "Read only file system";
+	case ERANGE: return "Range error";
+	case ENOTEMPTY: return "Not empty";
+	case ENAMETOOLONG: return "Name too long";
+	case ENOMEM: return "Out of memory";
+	case EFAULT: return "Fault";
+	case EEXIST: return "Name exists";
+	case ENOTDIR: return "Not a directory";
+	case EISDIR: return "Not permitted on a directory";
+	case ELOOP:  return "Symlink loop";
+	case 0: return "No error";
+	default: return "Unknown error";
+	}
+}
+
+extern nand_info_t nand_info[];
+
+void cmd_yaffs_tracemask(unsigned set, unsigned mask)
+{
+	if (set)
+		yaffs_trace_mask = mask;
+
+	printf("yaffs trace mask: %08x\n", yaffs_trace_mask);
+}
+
+static int yaffs_regions_overlap(int a, int b, int x, int y)
+{
+	return	(a <= x && x <= b) ||
+		(a <= y && y <= b) ||
+		(x <= a && a <= y) ||
+		(x <= b && b <= y);
+}
+
+void cmd_yaffs_devconfig(char *_mp, int flash_dev,
+			int start_block, int end_block)
+{
+	struct mtd_info *mtd = NULL;
+	struct yaffs_dev *dev = NULL;
+	struct yaffs_dev *chk;
+	char *mp = NULL;
+	struct nand_chip *chip;
+
+	dev = calloc(1, sizeof(*dev));
+	mp = strdup(_mp);
+
+	mtd = &nand_info[flash_dev];
+
+	if (!dev || !mp) {
+		/* Alloc error */
+		printf("Failed to allocate memory\n");
+		goto err;
+	}
+
+	if (flash_dev >= CONFIG_SYS_MAX_NAND_DEVICE) {
+		printf("Flash device invalid\n");
+		goto err;
+	}
+
+	if (end_block == 0)
+		end_block = mtd->size / mtd->erasesize - 1;
+
+	if (end_block < start_block) {
+		printf("Bad start/end\n");
+		goto err;
+	}
+
+	chip =  mtd->priv;
+
+	/* Check for any conflicts */
+	yaffs_dev_rewind();
+	while (1) {
+		chk = yaffs_next_dev();
+		if (!chk)
+			break;
+		if (strcmp(chk->param.name, mp) == 0) {
+			printf("Mount point name already used\n");
+			goto err;
+		}
+		if (chk->driver_context == mtd &&
+			yaffs_regions_overlap(
+				chk->param.start_block, chk->param.end_block,
+				start_block, end_block)) {
+			printf("Region overlaps with partition %s\n",
+				chk->param.name);
+			goto err;
+		}
+
+	}
+
+	/* Seems sane, so configure */
+	memset(dev, 0, sizeof(*dev));
+	dev->param.name = mp;
+	dev->driver_context = mtd;
+	dev->param.start_block = start_block;
+	dev->param.end_block = end_block;
+	dev->param.chunks_per_block = mtd->erasesize / mtd->writesize;
+	dev->param.total_bytes_per_chunk = mtd->writesize;
+	dev->param.is_yaffs2 = 1;
+	dev->param.use_nand_ecc = 1;
+	dev->param.n_reserved_blocks = 5;
+	if (chip->ecc.layout->oobavail < sizeof(struct yaffs_packed_tags2))
+		dev->param.inband_tags = 1;
+	dev->param.n_caches = 10;
+	dev->param.write_chunk_tags_fn = nandmtd2_write_chunk_tags;
+	dev->param.read_chunk_tags_fn = nandmtd2_read_chunk_tags;
+	dev->param.erase_fn = nandmtd_EraseBlockInNAND;
+	dev->param.initialise_flash_fn = nandmtd_InitialiseNAND;
+	dev->param.bad_block_fn = nandmtd2_MarkNANDBlockBad;
+	dev->param.query_block_fn = nandmtd2_QueryNANDBlock;
+
+	yaffs_add_device(dev);
+
+	printf("Configures yaffs mount %s: dev %d start block %d, end block %d %s\n",
+		mp, flash_dev, start_block, end_block,
+		dev->param.inband_tags ? "using inband tags" : "");
+	return;
+
+err:
+	free(dev);
+	free(mp);
+}
+
+void cmd_yaffs_dev_ls(void)
+{
+	struct yaffs_dev *dev;
+	int flash_dev;
+	int free_space;
+
+	yaffs_dev_rewind();
+
+	while (1) {
+		dev = yaffs_next_dev();
+		if (!dev)
+			return;
+		flash_dev =
+			((unsigned) dev->driver_context - (unsigned) nand_info)/
+				sizeof(nand_info[0]);
+		printf("%-10s %5d 0x%05x 0x%05x %s",
+			dev->param.name, flash_dev,
+			dev->param.start_block, dev->param.end_block,
+			dev->param.inband_tags ? "using inband tags, " : "");
+
+		free_space = yaffs_freespace(dev->param.name);
+		if (free_space < 0)
+			printf("not mounted\n");
+		else
+			printf("free 0x%x\n", free_space);
+
+	}
+}
+
+void make_a_file(char *yaffsName, char bval, int sizeOfFile)
+{
+	int outh;
+	int i;
+	unsigned char buffer[100];
+
+	outh = yaffs_open(yaffsName,
+				O_CREAT | O_RDWR | O_TRUNC,
+				S_IREAD | S_IWRITE);
+	if (outh < 0) {
+		printf("Error opening file: %d. %s\n", outh, yaffs_error_str());
+		return;
+	}
+
+	memset(buffer, bval, 100);
+
+	do {
+		i = sizeOfFile;
+		if (i > 100)
+			i = 100;
+		sizeOfFile -= i;
+
+		yaffs_write(outh, buffer, i);
+
+	} while (sizeOfFile > 0);
+
+
+	yaffs_close(outh);
+}
+
+void read_a_file(char *fn)
+{
+	int h;
+	int i = 0;
+	unsigned char b;
+
+	h = yaffs_open(fn, O_RDWR, 0);
+	if (h < 0) {
+		printf("File not found\n");
+		return;
+	}
+
+	while (yaffs_read(h, &b, 1) > 0) {
+		printf("%02x ", b);
+		i++;
+		if (i > 32) {
+			printf("\n");
+			i = 0;;
+		}
+	}
+	printf("\n");
+	yaffs_close(h);
+}
+
+void cmd_yaffs_mount(char *mp)
+{
+	int retval = yaffs_mount(mp);
+	if (retval < 0)
+		printf("Error mounting %s, return value: %d, %s\n", mp,
+			yaffsfs_GetError(), yaffs_error_str());
+}
+
+
+void cmd_yaffs_umount(char *mp)
+{
+	if (yaffs_unmount(mp) == -1)
+		printf("Error umounting %s, return value: %d, %s\n", mp,
+			yaffsfs_GetError(), yaffs_error_str());
+}
+
+void cmd_yaffs_write_file(char *yaffsName, char bval, int sizeOfFile)
+{
+	make_a_file(yaffsName, bval, sizeOfFile);
+}
+
+
+void cmd_yaffs_read_file(char *fn)
+{
+	read_a_file(fn);
+}
+
+
+void cmd_yaffs_mread_file(char *fn, char *addr)
+{
+	int h;
+	struct yaffs_stat s;
+
+	yaffs_stat(fn, &s);
+
+	printf("Copy %s to 0x%p... ", fn, addr);
+	h = yaffs_open(fn, O_RDWR, 0);
+	if (h < 0) {
+		printf("File not found\n");
+		return;
+	}
+
+	yaffs_read(h, addr, (int)s.st_size);
+	printf("\t[DONE]\n");
+
+	yaffs_close(h);
+}
+
+
+void cmd_yaffs_mwrite_file(char *fn, char *addr, int size)
+{
+	int outh;
+
+	outh = yaffs_open(fn, O_CREAT | O_RDWR | O_TRUNC, S_IREAD | S_IWRITE);
+	if (outh < 0)
+		printf("Error opening file: %d, %s\n", outh, yaffs_error_str());
+
+	yaffs_write(outh, addr, size);
+
+	yaffs_close(outh);
+}
+
+
+void cmd_yaffs_ls(const char *mountpt, int longlist)
+{
+	int i;
+	yaffs_DIR *d;
+	struct yaffs_dirent *de;
+	struct yaffs_stat stat;
+	char tempstr[255];
+
+	d = yaffs_opendir(mountpt);
+
+	if (!d) {
+		printf("opendir failed, %s\n", yaffs_error_str());
+		return;
+	}
+
+	for (i = 0; (de = yaffs_readdir(d)) != NULL; i++) {
+		if (longlist) {
+			sprintf(tempstr, "%s/%s", mountpt, de->d_name);
+			yaffs_lstat(tempstr, &stat);
+			printf("%-25s\t%7ld",
+					de->d_name,
+					(long)stat.st_size);
+			printf(" %5d %s\n",
+					stat.st_ino,
+					yaffs_file_type_str(&stat));
+		} else {
+			printf("%s\n", de->d_name);
+		}
+	}
+
+	yaffs_closedir(d);
+}
+
+
+void cmd_yaffs_mkdir(const char *dir)
+{
+	int retval = yaffs_mkdir(dir, 0);
+
+	if (retval < 0)
+		printf("yaffs_mkdir returning error: %d, %s\n",
+			retval, yaffs_error_str());
+}
+
+void cmd_yaffs_rmdir(const char *dir)
+{
+	int retval = yaffs_rmdir(dir);
+
+	if (retval < 0)
+		printf("yaffs_rmdir returning error: %d, %s\n",
+			retval, yaffs_error_str());
+}
+
+void cmd_yaffs_rm(const char *path)
+{
+	int retval = yaffs_unlink(path);
+
+	if (retval < 0)
+		printf("yaffs_unlink returning error: %d, %s\n",
+			retval, yaffs_error_str());
+}
+
+void cmd_yaffs_mv(const char *oldPath, const char *newPath)
+{
+	int retval = yaffs_rename(newPath, oldPath);
+
+	if (retval < 0)
+		printf("yaffs_unlink returning error: %d, %s\n",
+			retval, yaffs_error_str());
+}
diff --git a/fs/yaffs2/yaffs_verify.c b/fs/yaffs2/yaffs_verify.c
new file mode 100644
index 0000000..db48e56
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.c
@@ -0,0 +1,529 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_verify.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+int yaffs_skip_verification(struct yaffs_dev *dev)
+{
+	dev = dev;
+	return !(yaffs_trace_mask &
+		 (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_full_verification(struct yaffs_dev *dev)
+{
+	dev = dev;
+	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
+{
+	dev = dev;
+	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+static const char * const block_state_name[] = {
+	"Unknown",
+	"Needs scan",
+	"Scanning",
+	"Empty",
+	"Allocating",
+	"Full",
+	"Dirty",
+	"Checkpoint",
+	"Collecting",
+	"Dead"
+};
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
+{
+	int actually_used;
+	int in_use;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Report illegal runtime states */
+	if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has undefined state %d",
+			n, bi->block_state);
+
+	switch (bi->block_state) {
+	case YAFFS_BLOCK_STATE_UNKNOWN:
+	case YAFFS_BLOCK_STATE_SCANNING:
+	case YAFFS_BLOCK_STATE_NEEDS_SCAN:
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has bad run-state %s",
+			n, block_state_name[bi->block_state]);
+	}
+
+	/* Check pages in use and soft deletions are legal */
+
+	actually_used = bi->pages_in_use - bi->soft_del_pages;
+
+	if (bi->pages_in_use < 0 ||
+	    bi->pages_in_use > dev->param.chunks_per_block ||
+	    bi->soft_del_pages < 0 ||
+	    bi->soft_del_pages > dev->param.chunks_per_block ||
+	    actually_used < 0 || actually_used > dev->param.chunks_per_block)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has illegal values pages_in_used %d soft_del_pages %d",
+			n, bi->pages_in_use, bi->soft_del_pages);
+
+	/* Check chunk bitmap legal */
+	in_use = yaffs_count_chunk_bits(dev, n);
+	if (in_use != bi->pages_in_use)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
+			n, bi->pages_in_use, in_use);
+}
+
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+				struct yaffs_block_info *bi, int n)
+{
+	yaffs_verify_blk(dev, bi, n);
+
+	/* After collection the block should be in the erased state */
+
+	if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
+	    bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Block %d is in state %d after gc, should be erased",
+			n, bi->block_state);
+	}
+}
+
+void yaffs_verify_blocks(struct yaffs_dev *dev)
+{
+	int i;
+	int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
+	int illegal_states = 0;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	memset(state_count, 0, sizeof(state_count));
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+		yaffs_verify_blk(dev, bi, i);
+
+		if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
+			state_count[bi->block_state]++;
+		else
+			illegal_states++;
+	}
+
+	yaffs_trace(YAFFS_TRACE_VERIFY,	"Block summary");
+
+	yaffs_trace(YAFFS_TRACE_VERIFY,
+		"%d blocks have illegal states",
+		illegal_states);
+	if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Too many allocating blocks");
+
+	for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"%s %d blocks",
+			block_state_name[i], state_count[i]);
+
+	if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Checkpoint block count wrong dev %d count %d",
+			dev->blocks_in_checkpt,
+			state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
+
+	if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Erased block count wrong dev %d count %d",
+			dev->n_erased_blocks,
+			state_count[YAFFS_BLOCK_STATE_EMPTY]);
+
+	if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Too many collecting blocks %d (max is 1)",
+			state_count[YAFFS_BLOCK_STATE_COLLECTING]);
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in
+ * which case those tests will not be performed.
+ */
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+		     struct yaffs_ext_tags *tags, int parent_check)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	if (!(tags && obj && oh)) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Verifying object header tags %p obj %p oh %p",
+			tags, obj, oh);
+		return;
+	}
+
+	if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+	    oh->type > YAFFS_OBJECT_TYPE_MAX)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header type is illegal value 0x%x",
+			tags->obj_id, oh->type);
+
+	if (tags->obj_id != obj->obj_id)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch obj_id %d",
+			tags->obj_id, obj->obj_id);
+
+	/*
+	 * Check that the object's parent ids match if parent_check requested.
+	 *
+	 * Tests do not apply to the root object.
+	 */
+
+	if (parent_check && tags->obj_id > 1 && !obj->parent)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch parent_id %d obj->parent is NULL",
+			tags->obj_id, oh->parent_obj_id);
+
+	if (parent_check && obj->parent &&
+	    oh->parent_obj_id != obj->parent->obj_id &&
+	    (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
+	     obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch parent_id %d parent_obj_id %d",
+			tags->obj_id, oh->parent_obj_id,
+			obj->parent->obj_id);
+
+	if (tags->obj_id > 1 && oh->name[0] == 0)	/* Null name */
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header name is NULL",
+			obj->obj_id);
+
+	if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff)	/* Junk name */
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header name is 0xff",
+			obj->obj_id);
+}
+
+void yaffs_verify_file(struct yaffs_obj *obj)
+{
+	u32 x;
+	int required_depth;
+	int actual_depth;
+	int last_chunk;
+	u32 offset_in_chunk;
+	u32 the_chunk;
+
+	u32 i;
+	struct yaffs_dev *dev;
+	struct yaffs_ext_tags tags;
+	struct yaffs_tnode *tn;
+	u32 obj_id;
+
+	if (!obj)
+		return;
+
+	if (yaffs_skip_verification(obj->my_dev))
+		return;
+
+	dev = obj->my_dev;
+	obj_id = obj->obj_id;
+
+
+	/* Check file size is consistent with tnode depth */
+	yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size,
+				&last_chunk, &offset_in_chunk);
+	last_chunk++;
+	x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
+	while (x > 0) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		required_depth++;
+	}
+
+	actual_depth = obj->variant.file_variant.top_level;
+
+	/* Check that the chunks in the tnode tree are all correct.
+	 * We do this by scanning through the tnode tree and
+	 * checking the tags for every chunk match.
+	 */
+
+	if (yaffs_skip_nand_verification(dev))
+		return;
+
+	for (i = 1; i <= last_chunk; i++) {
+		tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
+
+		if (!tn)
+			continue;
+
+		the_chunk = yaffs_get_group_base(dev, tn, i);
+		if (the_chunk > 0) {
+			yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+						 &tags);
+			if (tags.obj_id != obj_id || tags.chunk_id != i)
+				yaffs_trace(YAFFS_TRACE_VERIFY,
+					"Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
+					obj_id, i, the_chunk,
+					tags.obj_id, tags.chunk_id);
+		}
+	}
+}
+
+void yaffs_verify_link(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	/* Verify sane equivalent object */
+}
+
+void yaffs_verify_symlink(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	/* Verify symlink string */
+}
+
+void yaffs_verify_special(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+}
+
+void yaffs_verify_obj(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
+	u32 chunk_min;
+	u32 chunk_max;
+	u32 chunk_id_ok;
+	u32 chunk_in_range;
+	u32 chunk_wrongly_deleted;
+	u32 chunk_valid;
+
+	if (!obj)
+		return;
+
+	if (obj->being_created)
+		return;
+
+	dev = obj->my_dev;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Check sane object header chunk */
+
+	chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
+	chunk_max =
+	    (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
+
+	chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
+			  ((unsigned)(obj->hdr_chunk)) <= chunk_max);
+	chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
+	chunk_valid = chunk_in_range &&
+	    yaffs_check_chunk_bit(dev,
+				  obj->hdr_chunk / dev->param.chunks_per_block,
+				  obj->hdr_chunk % dev->param.chunks_per_block);
+	chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
+
+	if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has chunk_id %d %s %s",
+			obj->obj_id, obj->hdr_chunk,
+			chunk_id_ok ? "" : ",out of range",
+			chunk_wrongly_deleted ? ",marked as deleted" : "");
+
+	if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
+		struct yaffs_ext_tags tags;
+		struct yaffs_obj_hdr *oh;
+		u8 *buffer = yaffs_get_temp_buffer(dev);
+
+		oh = (struct yaffs_obj_hdr *)buffer;
+
+		yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
+
+		yaffs_verify_oh(obj, oh, &tags, 1);
+
+		yaffs_release_temp_buffer(dev, buffer);
+	}
+
+	/* Verify it has a parent */
+	if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has parent pointer %p which does not look like an object",
+			obj->obj_id, obj->parent);
+	}
+
+	/* Verify parent is a directory */
+	if (obj->parent &&
+	    obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d's parent is not a directory (type %d)",
+			obj->obj_id, obj->parent->variant_type);
+	}
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_verify_file(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_verify_symlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_verify_dir(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_verify_link(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_verify_special(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+	default:
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has illegaltype %d",
+		   obj->obj_id, obj->variant_type);
+		break;
+	}
+}
+
+void yaffs_verify_objects(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	int i;
+	struct list_head *lh;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Iterate through the objects in each hash entry */
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each(lh, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			yaffs_verify_obj(obj);
+		}
+	}
+}
+
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
+{
+	struct list_head *lh;
+	struct yaffs_obj *list_obj;
+	int count = 0;
+
+	if (!obj) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
+		BUG();
+		return;
+	}
+
+	if (yaffs_skip_verification(obj->my_dev))
+		return;
+
+	if (!obj->parent) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
+		BUG();
+		return;
+	}
+
+	if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
+		BUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	list_for_each(lh, &obj->parent->variant.dir_variant.children) {
+		list_obj = list_entry(lh, struct yaffs_obj, siblings);
+		yaffs_verify_obj(list_obj);
+		if (obj == list_obj)
+			count++;
+	}
+
+	if (count != 1) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Object in directory %d times",
+			count);
+		BUG();
+	}
+}
+
+void yaffs_verify_dir(struct yaffs_obj *directory)
+{
+	struct list_head *lh;
+	struct yaffs_obj *list_obj;
+
+	if (!directory) {
+		BUG();
+		return;
+	}
+
+	if (yaffs_skip_full_verification(directory->my_dev))
+		return;
+
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Directory has wrong type: %d",
+			directory->variant_type);
+		BUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	list_for_each(lh, &directory->variant.dir_variant.children) {
+		list_obj = list_entry(lh, struct yaffs_obj, siblings);
+		if (list_obj->parent != directory) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Object in directory list has wrong parent %p",
+				list_obj->parent);
+			BUG();
+		}
+		yaffs_verify_obj_in_dir(list_obj);
+	}
+}
+
+static int yaffs_free_verification_failures;
+
+void yaffs_verify_free_chunks(struct yaffs_dev *dev)
+{
+	int counted;
+	int difference;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	counted = yaffs_count_free_chunks(dev);
+
+	difference = dev->n_free_chunks - counted;
+
+	if (difference) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Freechunks verification failure %d %d %d",
+			dev->n_free_chunks, counted, difference);
+		yaffs_free_verification_failures++;
+	}
+}
+
+int yaffs_verify_file_sane(struct yaffs_obj *in)
+{
+	in = in;
+	return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_verify.h b/fs/yaffs2/yaffs_verify.h
new file mode 100644
index 0000000..4f4af8d
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.h
@@ -0,0 +1,43 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_VERIFY_H__
+#define __YAFFS_VERIFY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi,
+		      int n);
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+				struct yaffs_block_info *bi, int n);
+void yaffs_verify_blocks(struct yaffs_dev *dev);
+
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+		     struct yaffs_ext_tags *tags, int parent_check);
+void yaffs_verify_file(struct yaffs_obj *obj);
+void yaffs_verify_link(struct yaffs_obj *obj);
+void yaffs_verify_symlink(struct yaffs_obj *obj);
+void yaffs_verify_special(struct yaffs_obj *obj);
+void yaffs_verify_obj(struct yaffs_obj *obj);
+void yaffs_verify_objects(struct yaffs_dev *dev);
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj);
+void yaffs_verify_dir(struct yaffs_obj *directory);
+void yaffs_verify_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_verify_file_sane(struct yaffs_obj *obj);
+
+int yaffs_skip_verification(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffs_yaffs1.c b/fs/yaffs2/yaffs_yaffs1.c
new file mode 100644
index 0000000..d277e20
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.c
@@ -0,0 +1,422 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+#include "yaffs_attribs.h"
+
+int yaffs1_scan(struct yaffs_dev *dev)
+{
+	struct yaffs_ext_tags tags;
+	int blk;
+	int result;
+	int chunk;
+	int c;
+	int deleted;
+	enum yaffs_block_state state;
+	LIST_HEAD(hard_list);
+	struct yaffs_block_info *bi;
+	u32 seq_number;
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_obj *in;
+	struct yaffs_obj *parent;
+	int alloc_failed = 0;
+	struct yaffs_shadow_fixer *shadow_fixers = NULL;
+	u8 *chunk_data;
+
+	yaffs_trace(YAFFS_TRACE_SCAN,
+		"yaffs1_scan starts  intstartblk %d intendblk %d...",
+		dev->internal_start_block, dev->internal_end_block);
+
+	chunk_data = yaffs_get_temp_buffer(dev);
+
+	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->block_info;
+	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+	     blk++) {
+		yaffs_clear_chunk_bits(dev, blk);
+		bi->pages_in_use = 0;
+		bi->soft_del_pages = 0;
+
+		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+		bi->block_state = state;
+		bi->seq_number = seq_number;
+
+		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+			"Block scanning block %d state %d seq %d",
+			blk, state, seq_number);
+
+		if (state == YAFFS_BLOCK_STATE_DEAD) {
+			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+				"block %d is bad", blk);
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+			dev->n_erased_blocks++;
+			dev->n_free_chunks += dev->param.chunks_per_block;
+		}
+		bi++;
+	}
+
+	/* For each block.... */
+	for (blk = dev->internal_start_block;
+	     !alloc_failed && blk <= dev->internal_end_block; blk++) {
+
+		cond_resched();
+
+		bi = yaffs_get_block_info(dev, blk);
+		state = bi->block_state;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning.... */
+		for (c = 0;
+			!alloc_failed && c < dev->param.chunks_per_block &&
+			state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) {
+			/* Read the tags and decide what to do */
+			chunk = blk * dev->param.chunks_per_block + c;
+
+			result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
+							  &tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED ||
+			    tags.is_deleted) {
+				/* YAFFS1 only...
+				 * A deleted chunk
+				 */
+				deleted++;
+				dev->n_free_chunks++;
+			} else if (!tags.chunk_used) {
+				/* An unassigned chunk in the block
+				 * This means that either the block is empty or
+				 * this is the one being allocated from
+				 */
+
+				if (c == 0) {
+					/* We're looking at the first chunk in
+					 *the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->n_erased_blocks++;
+				} else {
+					/* this is the block being allocated */
+					yaffs_trace(YAFFS_TRACE_SCAN,
+						" Allocating from %d %d",
+						blk, c);
+					state = YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->alloc_block = blk;
+					dev->alloc_page = c;
+					dev->alloc_block_finder = blk;
+
+				}
+
+				dev->n_free_chunks +=
+				    (dev->param.chunks_per_block - c);
+			} else if (tags.chunk_id > 0) {
+				/* chunk_id > 0 so it is a data chunk... */
+				unsigned int endpos;
+
+				yaffs_set_chunk_bit(dev, blk, c);
+				bi->pages_in_use++;
+
+				in = yaffs_find_or_create_by_number(dev,
+							tags.obj_id,
+							YAFFS_OBJECT_TYPE_FILE);
+				/* PutChunkIntoFile checks for a clash
+				 * (two data chunks with the same chunk_id).
+				 */
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in) {
+					if (!yaffs_put_chunk_in_file
+					    (in, tags.chunk_id, chunk, 1))
+						alloc_failed = 1;
+				}
+
+				endpos =
+				    (tags.chunk_id - 1) *
+				    dev->data_bytes_per_chunk +
+				    tags.n_bytes;
+				if (in &&
+				    in->variant_type ==
+				     YAFFS_OBJECT_TYPE_FILE &&
+				    in->variant.file_variant.scanned_size <
+				      endpos) {
+					in->variant.file_variant.scanned_size =
+					    endpos;
+					if (!dev->param.use_header_file_size) {
+						in->variant.
+						    file_variant.file_size =
+						    in->variant.
+						    file_variant.scanned_size;
+					}
+
+				}
+			} else {
+				/* chunk_id == 0, so it is an ObjectHeader.
+				 * Make the object
+				 */
+				yaffs_set_chunk_bit(dev, blk, c);
+				bi->pages_in_use++;
+
+				result = yaffs_rd_chunk_tags_nand(dev, chunk,
+								  chunk_data,
+								  NULL);
+
+				oh = (struct yaffs_obj_hdr *)chunk_data;
+
+				in = yaffs_find_by_number(dev, tags.obj_id);
+				if (in && in->variant_type != oh->type) {
+					/* This should not happen, but somehow
+					 * Wev'e ended up with an obj_id that
+					 * has been reused but not yet deleted,
+					 * and worse still it has changed type.
+					 * Delete the old object.
+					 */
+
+					yaffs_del_obj(in);
+					in = NULL;
+				}
+
+				in = yaffs_find_or_create_by_number(dev,
+								tags.obj_id,
+								oh->type);
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in && oh->shadows_obj > 0) {
+
+					struct yaffs_shadow_fixer *fixer;
+					fixer =
+						kmalloc(sizeof
+						(struct yaffs_shadow_fixer),
+						GFP_NOFS);
+					if (fixer) {
+						fixer->next = shadow_fixers;
+						shadow_fixers = fixer;
+						fixer->obj_id = tags.obj_id;
+						fixer->shadowed_id =
+						    oh->shadows_obj;
+						yaffs_trace(YAFFS_TRACE_SCAN,
+							" Shadow fixer: %d shadows %d",
+							fixer->obj_id,
+							fixer->shadowed_id);
+
+					}
+
+				}
+
+				if (in && in->valid) {
+					/* We have already filled this one.
+					 * We have a duplicate and need to
+					 * resolve it. */
+
+					unsigned existing_serial = in->serial;
+					unsigned new_serial =
+					    tags.serial_number;
+
+					if (((existing_serial + 1) & 3) ==
+					    new_serial) {
+						/* Use new one - destroy the
+						 * exisiting one */
+						yaffs_chunk_del(dev,
+								in->hdr_chunk,
+								1, __LINE__);
+						in->valid = 0;
+					} else {
+						/* Use existing - destroy
+						 * this one. */
+						yaffs_chunk_del(dev, chunk, 1,
+								__LINE__);
+					}
+				}
+
+				if (in && !in->valid &&
+				    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+				     tags.obj_id ==
+				     YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle
+					 * with directory structure */
+					in->valid = 1;
+					in->variant_type = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+					yaffs_load_attribs(in, oh);
+					in->hdr_chunk = chunk;
+					in->serial = tags.serial_number;
+
+				} else if (in && !in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->variant_type = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+					yaffs_load_attribs(in, oh);
+					in->hdr_chunk = chunk;
+					in->serial = tags.serial_number;
+
+					yaffs_set_obj_name_from_oh(in, oh);
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					parent =
+					    yaffs_find_or_create_by_number
+					    (dev, oh->parent_obj_id,
+					     YAFFS_OBJECT_TYPE_DIRECTORY);
+					if (!parent)
+						alloc_failed = 1;
+					if (parent && parent->variant_type ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variant_type =
+						    YAFFS_OBJECT_TYPE_DIRECTORY;
+						INIT_LIST_HEAD(&parent->
+							variant.dir_variant.
+							children);
+					} else if (!parent ||
+						parent->variant_type !=
+						YAFFS_OBJECT_TYPE_DIRECTORY) {
+						/* Hoosterman, a problem....
+						 * We're trying to use a
+						 * non-directory as a directory
+						 */
+
+						yaffs_trace(YAFFS_TRACE_ERROR,
+							"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+							);
+						parent = dev->lost_n_found;
+					}
+
+					yaffs_add_obj_to_dir(parent, in);
+
+					switch (in->variant_type) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+						if (dev->param.
+						    use_header_file_size)
+							in->variant.
+							file_variant.file_size
+							= yaffs_oh_to_size(oh);
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						in->variant.
+						    hardlink_variant.equiv_id =
+						    oh->equiv_id;
+						list_add(&in->hard_links,
+								&hard_list);
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:
+						in->variant.symlink_variant.
+						    alias =
+						    yaffs_clone_str(oh->alias);
+						if (!in->variant.
+						    symlink_variant.alias)
+							alloc_failed = 1;
+						break;
+					}
+				}
+			}
+		}
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* If we got this far while scanning,
+			 * then the block is fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			/* If the block was partially allocated then
+			 * treat it as fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
+
+		bi->block_state = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state == YAFFS_BLOCK_STATE_FULL)
+			yaffs_block_became_dirty(dev, blk);
+	}
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add
+	 * these hardlinks.
+	 */
+
+	yaffs_link_fixup(dev, &hard_list);
+
+	/*
+	 * Fix up any shadowed objects.
+	 * There should not be more than one of these.
+	 */
+	{
+		struct yaffs_shadow_fixer *fixer;
+		struct yaffs_obj *obj;
+
+		while (shadow_fixers) {
+			fixer = shadow_fixers;
+			shadow_fixers = fixer->next;
+			/* Complete the rename transaction by deleting the
+			 * shadowed object then setting the object header
+			 to unshadowed.
+			 */
+			obj = yaffs_find_by_number(dev, fixer->shadowed_id);
+			if (obj)
+				yaffs_del_obj(obj);
+
+			obj = yaffs_find_by_number(dev, fixer->obj_id);
+
+			if (obj)
+				yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+			kfree(fixer);
+		}
+	}
+
+	yaffs_release_temp_buffer(dev, chunk_data);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
+
+	return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffsinterface.h b/fs/yaffs2/yaffs_yaffs1.h
index 810837a..97e2fdd 100644
--- a/fs/yaffs2/yaffsinterface.h
+++ b/fs/yaffs2/yaffs_yaffs1.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,9 +13,10 @@
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  */
 
-#ifndef __YAFFSINTERFACE_H__
-#define __YAFFSINTERFACE_H__
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
 
-int yaffs_Initialise(unsigned nBlocks);
+#include "yaffs_guts.h"
+int yaffs1_scan(struct yaffs_dev *dev);
 
 #endif
diff --git a/fs/yaffs2/yaffs_yaffs2.c b/fs/yaffs2/yaffs_yaffs2.c
new file mode 100644
index 0000000..f1dc972
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.c
@@ -0,0 +1,1532 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+#include "yaffs_attribs.h"
+#include "yaffs_summary.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+
+/* yaffs_calc_oldest_dirty_seq()
+ * yaffs2_find_oldest_dirty_seq()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+	int i;
+	unsigned seq;
+	unsigned block_no = 0;
+	struct yaffs_block_info *b;
+
+	if (!dev->param.is_yaffs2)
+		return;
+
+	/* Find the oldest dirty sequence number. */
+	seq = dev->seq_number + 1;
+	b = dev->block_info;
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
+		    (b->pages_in_use - b->soft_del_pages) <
+		    dev->param.chunks_per_block &&
+		    b->seq_number < seq) {
+			seq = b->seq_number;
+			block_no = i;
+		}
+		b++;
+	}
+
+	if (block_no) {
+		dev->oldest_dirty_seq = seq;
+		dev->oldest_dirty_block = block_no;
+	}
+}
+
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!dev->oldest_dirty_seq)
+		yaffs_calc_oldest_dirty_seq(dev);
+}
+
+/*
+ * yaffs_clear_oldest_dirty_seq()
+ * Called when a block is erased or marked bad. (ie. when its seq_number
+ * becomes invalid). If the value matches the oldest then we clear
+ * dev->oldest_dirty_seq to force its recomputation.
+ */
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+				   struct yaffs_block_info *bi)
+{
+
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
+		dev->oldest_dirty_seq = 0;
+		dev->oldest_dirty_block = 0;
+	}
+}
+
+/*
+ * yaffs2_update_oldest_dirty_seq()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldest_dirty_seq is actually being tracked.
+ */
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+				    struct yaffs_block_info *bi)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (dev->oldest_dirty_seq) {
+		if (dev->oldest_dirty_seq > bi->seq_number) {
+			dev->oldest_dirty_seq = bi->seq_number;
+			dev->oldest_dirty_block = block_no;
+		}
+	}
+}
+
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
+{
+
+	if (!dev->param.is_yaffs2)
+		return 1;	/* disqualification only applies to yaffs2. */
+
+	if (!bi->has_shrink_hdr)
+		return 1;	/* can gc */
+
+	yaffs2_find_oldest_dirty_seq(dev);
+
+	/* Can't do gc of this block if there are any blocks older than this
+	 * one that have discarded pages.
+	 */
+	return (bi->seq_number <= dev->oldest_dirty_seq);
+}
+
+/*
+ * yaffs2_find_refresh_block()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev)
+{
+	u32 b;
+	u32 oldest = 0;
+	u32 oldest_seq = 0;
+	struct yaffs_block_info *bi;
+
+	if (!dev->param.is_yaffs2)
+		return oldest;
+
+	/*
+	 * If refresh period < 10 then refreshing is disabled.
+	 */
+	if (dev->param.refresh_period < 10)
+		return oldest;
+
+	/*
+	 * Fix broken values.
+	 */
+	if (dev->refresh_skip > dev->param.refresh_period)
+		dev->refresh_skip = dev->param.refresh_period;
+
+	if (dev->refresh_skip > 0)
+		return oldest;
+
+	/*
+	 * Refresh skip is now zero.
+	 * We'll do a refresh this time around....
+	 * Update the refresh skip and find the oldest block.
+	 */
+	dev->refresh_skip = dev->param.refresh_period;
+	dev->refresh_count++;
+	bi = dev->block_info;
+	for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+
+			if (oldest < 1 || bi->seq_number < oldest_seq) {
+				oldest = b;
+				oldest_seq = bi->seq_number;
+			}
+		}
+		bi++;
+	}
+
+	if (oldest > 0) {
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC refresh count %d selected block %d with seq_number %d",
+			dev->refresh_count, oldest, oldest_seq);
+	}
+
+	return oldest;
+}
+
+int yaffs2_checkpt_required(struct yaffs_dev *dev)
+{
+	int nblocks;
+
+	if (!dev->param.is_yaffs2)
+		return 0;
+
+	nblocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+	return !dev->param.skip_checkpt_wr &&
+	    !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
+{
+	int retval;
+	int n_bytes = 0;
+	int n_blocks;
+	int dev_blocks;
+
+	if (!dev->param.is_yaffs2)
+		return 0;
+
+	if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
+		/* Not a valid value so recalculate */
+		dev_blocks = dev->param.end_block - dev->param.start_block + 1;
+		n_bytes += sizeof(struct yaffs_checkpt_validity);
+		n_bytes += sizeof(struct yaffs_checkpt_dev);
+		n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
+		n_bytes += dev_blocks * dev->chunk_bit_stride;
+		n_bytes +=
+		    (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) *
+		    dev->n_obj;
+		n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes;
+		n_bytes += sizeof(struct yaffs_checkpt_validity);
+		n_bytes += sizeof(u32);	/* checksum */
+
+		/* Round up and add 2 blocks to allow for some bad blocks,
+		 * so add 3 */
+
+		n_blocks =
+		    (n_bytes /
+		     (dev->data_bytes_per_chunk *
+		      dev->param.chunks_per_block)) + 3;
+
+		dev->checkpoint_blocks_required = n_blocks;
+	}
+
+	retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
+	if (retval < 0)
+		retval = 0;
+	return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+	struct yaffs_checkpt_validity cp;
+
+	memset(&cp, 0, sizeof(cp));
+
+	cp.struct_type = sizeof(cp);
+	cp.magic = YAFFS_MAGIC;
+	cp.version = YAFFS_CHECKPOINT_VERSION;
+	cp.head = (head) ? 1 : 0;
+
+	return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+	struct yaffs_checkpt_validity cp;
+	int ok;
+
+	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	if (ok)
+		ok = (cp.struct_type == sizeof(cp)) &&
+		    (cp.magic == YAFFS_MAGIC) &&
+		    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+		    (cp.head == ((head) ? 1 : 0));
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
+				      struct yaffs_dev *dev)
+{
+	cp->n_erased_blocks = dev->n_erased_blocks;
+	cp->alloc_block = dev->alloc_block;
+	cp->alloc_page = dev->alloc_page;
+	cp->n_free_chunks = dev->n_free_chunks;
+
+	cp->n_deleted_files = dev->n_deleted_files;
+	cp->n_unlinked_files = dev->n_unlinked_files;
+	cp->n_bg_deletions = dev->n_bg_deletions;
+	cp->seq_number = dev->seq_number;
+
+}
+
+static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
+				     struct yaffs_checkpt_dev *cp)
+{
+	dev->n_erased_blocks = cp->n_erased_blocks;
+	dev->alloc_block = cp->alloc_block;
+	dev->alloc_page = cp->alloc_page;
+	dev->n_free_chunks = cp->n_free_chunks;
+
+	dev->n_deleted_files = cp->n_deleted_files;
+	dev->n_unlinked_files = cp->n_unlinked_files;
+	dev->n_bg_deletions = cp->n_bg_deletions;
+	dev->seq_number = cp->seq_number;
+}
+
+static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_dev cp;
+	u32 n_bytes;
+	u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+	int ok;
+
+	/* Write device runtime values */
+	yaffs2_dev_to_checkpt_dev(&cp, dev);
+	cp.struct_type = sizeof(cp);
+
+	ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (!ok)
+		return 0;
+
+	/* Write block info */
+	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+	ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes);
+	if (!ok)
+		return 0;
+
+	/* Write chunk bits */
+	n_bytes = n_blocks * dev->chunk_bit_stride;
+	ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == n_bytes);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_dev cp;
+	u32 n_bytes;
+	u32 n_blocks =
+	    (dev->internal_end_block - dev->internal_start_block + 1);
+	int ok;
+
+	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (!ok)
+		return 0;
+
+	if (cp.struct_type != sizeof(cp))
+		return 0;
+
+	yaffs_checkpt_dev_to_dev(dev, &cp);
+
+	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+
+	ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes);
+
+	if (!ok)
+		return 0;
+
+	n_bytes = n_blocks * dev->chunk_bit_stride;
+
+	ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes);
+
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
+				   struct yaffs_obj *obj)
+{
+	cp->obj_id = obj->obj_id;
+	cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
+	cp->hdr_chunk = obj->hdr_chunk;
+	cp->variant_type = obj->variant_type;
+	cp->deleted = obj->deleted;
+	cp->soft_del = obj->soft_del;
+	cp->unlinked = obj->unlinked;
+	cp->fake = obj->fake;
+	cp->rename_allowed = obj->rename_allowed;
+	cp->unlink_allowed = obj->unlink_allowed;
+	cp->serial = obj->serial;
+	cp->n_data_chunks = obj->n_data_chunks;
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
+	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+		cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
+}
+
+static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
+				     struct yaffs_checkpt_obj *cp)
+{
+	struct yaffs_obj *parent;
+
+	if (obj->variant_type != cp->variant_type) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Checkpoint read object %d type %d chunk %d does not match existing object type %d",
+			cp->obj_id, cp->variant_type, cp->hdr_chunk,
+			obj->variant_type);
+		return 0;
+	}
+
+	obj->obj_id = cp->obj_id;
+
+	if (cp->parent_id)
+		parent = yaffs_find_or_create_by_number(obj->my_dev,
+						cp->parent_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+	else
+		parent = NULL;
+
+	if (parent) {
+		if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
+				cp->obj_id, cp->parent_id,
+				cp->variant_type, cp->hdr_chunk,
+				parent->variant_type);
+			return 0;
+		}
+		yaffs_add_obj_to_dir(parent, obj);
+	}
+
+	obj->hdr_chunk = cp->hdr_chunk;
+	obj->variant_type = cp->variant_type;
+	obj->deleted = cp->deleted;
+	obj->soft_del = cp->soft_del;
+	obj->unlinked = cp->unlinked;
+	obj->fake = cp->fake;
+	obj->rename_allowed = cp->rename_allowed;
+	obj->unlink_allowed = cp->unlink_allowed;
+	obj->serial = cp->serial;
+	obj->n_data_chunks = cp->n_data_chunks;
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
+	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+		obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
+
+	if (obj->hdr_chunk > 0)
+		obj->lazy_loaded = 1;
+	return 1;
+}
+
+static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
+				       struct yaffs_tnode *tn, u32 level,
+				       int chunk_offset)
+{
+	int i;
+	struct yaffs_dev *dev = in->my_dev;
+	int ok = 1;
+	u32 base_offset;
+
+	if (!tn)
+		return 1;
+
+	if (level > 0) {
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+			if (!tn->internal[i])
+				continue;
+			ok = yaffs2_checkpt_tnode_worker(in,
+				 tn->internal[i],
+				 level - 1,
+				 (chunk_offset <<
+				  YAFFS_TNODES_INTERNAL_BITS) + i);
+		}
+		return ok;
+	}
+
+	/* Level 0 tnode */
+	base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
+	ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
+			sizeof(base_offset));
+	if (ok)
+		ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
+			dev->tnode_size);
+
+	return ok;
+}
+
+static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
+{
+	u32 end_marker = ~0;
+	int ok = 1;
+
+	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return ok;
+
+	ok = yaffs2_checkpt_tnode_worker(obj,
+					 obj->variant.file_variant.top,
+					 obj->variant.file_variant.
+					 top_level, 0);
+	if (ok)
+		ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker,
+				sizeof(end_marker)) == sizeof(end_marker));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
+{
+	u32 base_chunk;
+	int ok = 1;
+	struct yaffs_dev *dev = obj->my_dev;
+	struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
+	struct yaffs_tnode *tn;
+	int nread = 0;
+
+	ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
+	      sizeof(base_chunk));
+
+	while (ok && (~base_chunk)) {
+		nread++;
+		/* Read level 0 tnode */
+
+		tn = yaffs_get_tnode(dev);
+		if (tn)
+			ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
+				dev->tnode_size);
+		else
+			ok = 0;
+
+		if (tn && ok)
+			ok = yaffs_add_find_tnode_0(dev,
+						    file_stuct_ptr,
+						    base_chunk, tn) ? 1 : 0;
+
+		if (ok)
+			ok = (yaffs2_checkpt_rd
+			      (dev, &base_chunk,
+			       sizeof(base_chunk)) == sizeof(base_chunk));
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"Checkpoint read tnodes %d records, last %d. ok %d",
+		nread, base_chunk, ok);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_checkpt_obj cp;
+	int i;
+	int ok = 1;
+	struct list_head *lh;
+
+	/* Iterate through the objects in each hash entry,
+	 * dumping them to the checkpointing stream.
+	 */
+
+	for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each(lh, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			if (!obj->defered_free) {
+				yaffs2_obj_checkpt_obj(&cp, obj);
+				cp.struct_type = sizeof(cp);
+
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+					"Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
+					cp.obj_id, cp.parent_id,
+					cp.variant_type, cp.hdr_chunk, obj);
+
+				ok = (yaffs2_checkpt_wr(dev, &cp,
+						sizeof(cp)) == sizeof(cp));
+
+				if (ok &&
+					obj->variant_type ==
+					YAFFS_OBJECT_TYPE_FILE)
+					ok = yaffs2_wr_checkpt_tnodes(obj);
+			}
+		}
+	}
+
+	/* Dump end of list */
+	memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj));
+	cp.struct_type = sizeof(cp);
+
+	if (ok)
+		ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_checkpt_obj cp;
+	int ok = 1;
+	int done = 0;
+	LIST_HEAD(hard_list);
+
+
+	while (ok && !done) {
+		ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+		if (cp.struct_type != sizeof(cp)) {
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"struct size %d instead of %d ok %d",
+				cp.struct_type, (int)sizeof(cp), ok);
+			ok = 0;
+		}
+
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"Checkpoint read object %d parent %d type %d chunk %d ",
+			cp.obj_id, cp.parent_id, cp.variant_type,
+			cp.hdr_chunk);
+
+		if (ok && cp.obj_id == ~0) {
+			done = 1;
+		} else if (ok) {
+			obj =
+			    yaffs_find_or_create_by_number(dev, cp.obj_id,
+							   cp.variant_type);
+			if (obj) {
+				ok = yaffs2_checkpt_obj_to_obj(obj, &cp);
+				if (!ok)
+					break;
+				if (obj->variant_type ==
+					YAFFS_OBJECT_TYPE_FILE) {
+					ok = yaffs2_rd_checkpt_tnodes(obj);
+				} else if (obj->variant_type ==
+					YAFFS_OBJECT_TYPE_HARDLINK) {
+					list_add(&obj->hard_links, &hard_list);
+				}
+			} else {
+				ok = 0;
+			}
+		}
+	}
+
+	if (ok)
+		yaffs_link_fixup(dev, &hard_list);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
+{
+	u32 checkpt_sum;
+	int ok;
+
+	yaffs2_get_checkpt_sum(dev, &checkpt_sum);
+
+	ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
+		sizeof(checkpt_sum));
+
+	if (!ok)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
+{
+	u32 checkpt_sum0;
+	u32 checkpt_sum1;
+	int ok;
+
+	yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
+
+	ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
+		sizeof(checkpt_sum1));
+
+	if (!ok)
+		return 0;
+
+	if (checkpt_sum0 != checkpt_sum1)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
+{
+	int ok = 1;
+
+	if (!yaffs2_checkpt_required(dev)) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"skipping checkpoint write");
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_checkpt_open(dev, 1);
+
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint validity");
+		ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint device");
+		ok = yaffs2_wr_checkpt_dev(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint objects");
+		ok = yaffs2_wr_checkpt_objs(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint validity");
+		ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
+	}
+
+	if (ok)
+		ok = yaffs2_wr_checkpt_sum(dev);
+
+	if (!yaffs_checkpt_close(dev))
+		ok = 0;
+
+	if (ok)
+		dev->is_checkpointed = 1;
+	else
+		dev->is_checkpointed = 0;
+
+	return dev->is_checkpointed;
+}
+
+static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
+{
+	int ok = 1;
+
+	if (!dev->param.is_yaffs2)
+		ok = 0;
+
+	if (ok && dev->param.skip_checkpt_rd) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"skipping checkpoint read");
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_checkpt_open(dev, 0); /* open for read */
+
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint validity");
+		ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint device");
+		ok = yaffs2_rd_checkpt_dev(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint objects");
+		ok = yaffs2_rd_checkpt_objs(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint validity");
+		ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
+	}
+
+	if (ok) {
+		ok = yaffs2_rd_checkpt_sum(dev);
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint checksum %d", ok);
+	}
+
+	if (!yaffs_checkpt_close(dev))
+		ok = 0;
+
+	if (ok)
+		dev->is_checkpointed = 1;
+	else
+		dev->is_checkpointed = 0;
+
+	return ok ? 1 : 0;
+}
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
+{
+	if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
+		dev->is_checkpointed = 0;
+		yaffs2_checkpt_invalidate_stream(dev);
+	}
+	if (dev->param.sb_dirty_fn)
+		dev->param.sb_dirty_fn(dev);
+}
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev)
+{
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"save entry: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	yaffs_verify_objects(dev);
+	yaffs_verify_blocks(dev);
+	yaffs_verify_free_chunks(dev);
+
+	if (!dev->is_checkpointed) {
+		yaffs2_checkpt_invalidate(dev);
+		yaffs2_wr_checkpt_data(dev);
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
+		"save exit: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	return dev->is_checkpointed;
+}
+
+int yaffs2_checkpt_restore(struct yaffs_dev *dev)
+{
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"restore entry: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	retval = yaffs2_rd_checkpt_data(dev);
+
+	if (dev->is_checkpointed) {
+		yaffs_verify_objects(dev);
+		yaffs_verify_blocks(dev);
+		yaffs_verify_free_chunks(dev);
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"restore exit: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	return retval;
+}
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
+{
+	/* if new_size > old_file_size.
+	 * We're going to be writing a hole.
+	 * If the hole is small then write zeros otherwise write a start
+	 * of hole marker.
+	 */
+	loff_t old_file_size;
+	loff_t increase;
+	int small_hole;
+	int result = YAFFS_OK;
+	struct yaffs_dev *dev = NULL;
+	u8 *local_buffer = NULL;
+	int small_increase_ok = 0;
+
+	if (!obj)
+		return YAFFS_FAIL;
+
+	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	dev = obj->my_dev;
+
+	/* Bail out if not yaffs2 mode */
+	if (!dev->param.is_yaffs2)
+		return YAFFS_OK;
+
+	old_file_size = obj->variant.file_variant.file_size;
+
+	if (new_size <= old_file_size)
+		return YAFFS_OK;
+
+	increase = new_size - old_file_size;
+
+	if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
+	    yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+		small_hole = 1;
+	else
+		small_hole = 0;
+
+	if (small_hole)
+		local_buffer = yaffs_get_temp_buffer(dev);
+
+	if (local_buffer) {
+		/* fill hole with zero bytes */
+		loff_t pos = old_file_size;
+		int this_write;
+		int written;
+		memset(local_buffer, 0, dev->data_bytes_per_chunk);
+		small_increase_ok = 1;
+
+		while (increase > 0 && small_increase_ok) {
+			this_write = increase;
+			if (this_write > dev->data_bytes_per_chunk)
+				this_write = dev->data_bytes_per_chunk;
+			written =
+			    yaffs_do_file_wr(obj, local_buffer, pos, this_write,
+					     0);
+			if (written == this_write) {
+				pos += this_write;
+				increase -= this_write;
+			} else {
+				small_increase_ok = 0;
+			}
+		}
+
+		yaffs_release_temp_buffer(dev, local_buffer);
+
+		/* If out of space then reverse any chunks we've added */
+		if (!small_increase_ok)
+			yaffs_resize_file_down(obj, old_file_size);
+	}
+
+	if (!small_increase_ok &&
+	    obj->parent &&
+	    obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+	    obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
+		/* Write a hole start header with the old file size */
+		yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
+	}
+
+	return result;
+}
+
+struct yaffs_block_index {
+	int seq;
+	int block;
+};
+
+static int yaffs2_ybicmp(const void *a, const void *b)
+{
+	int aseq = ((struct yaffs_block_index *)a)->seq;
+	int bseq = ((struct yaffs_block_index *)b)->seq;
+	int ablock = ((struct yaffs_block_index *)a)->block;
+	int bblock = ((struct yaffs_block_index *)b)->block;
+
+	if (aseq == bseq)
+		return ablock - bblock;
+
+	return aseq - bseq;
+}
+
+static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
+		struct yaffs_block_info *bi,
+		int blk, int chunk_in_block,
+		int *found_chunks,
+		u8 *chunk_data,
+		struct list_head *hard_list,
+		int summary_available)
+{
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_obj *in;
+	struct yaffs_obj *parent;
+	int equiv_id;
+	loff_t file_size;
+	int is_shrink;
+	int is_unlinked;
+	struct yaffs_ext_tags tags;
+	int result;
+	int alloc_failed = 0;
+	int chunk = blk * dev->param.chunks_per_block + chunk_in_block;
+	struct yaffs_file_var *file_var;
+	struct yaffs_hardlink_var *hl_var;
+	struct yaffs_symlink_var *sl_var;
+
+	if (summary_available) {
+		result = yaffs_summary_fetch(dev, &tags, chunk_in_block);
+		tags.seq_number = bi->seq_number;
+	}
+
+	if (!summary_available || tags.obj_id == 0) {
+		result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
+		dev->tags_used++;
+	} else {
+		dev->summary_used++;
+	}
+
+	/* Let's have a good look at this chunk... */
+
+	if (!tags.chunk_used) {
+		/* An unassigned chunk in the block.
+		 * If there are used chunks after this one, then
+		 * it is a chunk that was skipped due to failing
+		 * the erased check. Just skip it so that it can
+		 * be deleted.
+		 * But, more typically, We get here when this is
+		 * an unallocated chunk and his means that
+		 * either the block is empty or this is the one
+		 * being allocated from
+		 */
+
+		if (*found_chunks) {
+			/* This is a chunk that was skipped due
+			 * to failing the erased check */
+		} else if (chunk_in_block == 0) {
+			/* We're looking at the first chunk in
+			 * the block so the block is unused */
+			bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+			dev->n_erased_blocks++;
+		} else {
+			if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+			    bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+				if (dev->seq_number == bi->seq_number) {
+					/* Allocating from this block*/
+					yaffs_trace(YAFFS_TRACE_SCAN,
+					    " Allocating from %d %d",
+					    blk, chunk_in_block);
+
+					bi->block_state =
+						YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->alloc_block = blk;
+					dev->alloc_page = chunk_in_block;
+					dev->alloc_block_finder = blk;
+				} else {
+					/* This is a partially written block
+					 * that is not the current
+					 * allocation block.
+					 */
+					yaffs_trace(YAFFS_TRACE_SCAN,
+						"Partially written block %d detected. gc will fix this.",
+						blk);
+				}
+			}
+		}
+
+		dev->n_free_chunks++;
+
+	} else if (tags.ecc_result ==
+		YAFFS_ECC_RESULT_UNFIXED) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			" Unfixed ECC in chunk(%d:%d), chunk ignored",
+			blk, chunk_in_block);
+			dev->n_free_chunks++;
+	} else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
+		   tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
+		   tags.obj_id == YAFFS_OBJECTID_SUMMARY ||
+		   (tags.chunk_id > 0 &&
+		     tags.n_bytes > dev->data_bytes_per_chunk) ||
+		   tags.seq_number != bi->seq_number) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored",
+			blk, chunk_in_block, tags.obj_id,
+			tags.chunk_id, tags.n_bytes);
+		dev->n_free_chunks++;
+	} else if (tags.chunk_id > 0) {
+		/* chunk_id > 0 so it is a data chunk... */
+		loff_t endpos;
+		loff_t chunk_base = (tags.chunk_id - 1) *
+					dev->data_bytes_per_chunk;
+
+		*found_chunks = 1;
+
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+
+		in = yaffs_find_or_create_by_number(dev,
+					tags.obj_id,
+					YAFFS_OBJECT_TYPE_FILE);
+		if (!in)
+			/* Out of memory */
+			alloc_failed = 1;
+
+		if (in &&
+		    in->variant_type == YAFFS_OBJECT_TYPE_FILE &&
+		    chunk_base < in->variant.file_variant.shrink_size) {
+			/* This has not been invalidated by
+			 * a resize */
+			if (!yaffs_put_chunk_in_file(in, tags.chunk_id,
+								chunk, -1))
+				alloc_failed = 1;
+
+			/* File size is calculated by looking at
+			 * the data chunks if we have not
+			 * seen an object header yet.
+			 * Stop this practice once we find an
+			 * object header.
+			 */
+			endpos = chunk_base + tags.n_bytes;
+
+			if (!in->valid &&
+			    in->variant.file_variant.scanned_size < endpos) {
+				in->variant.file_variant.
+				    scanned_size = endpos;
+				in->variant.file_variant.
+				    file_size = endpos;
+			}
+		} else if (in) {
+			/* This chunk has been invalidated by a
+			 * resize, or a past file deletion
+			 * so delete the chunk*/
+			yaffs_chunk_del(dev, chunk, 1, __LINE__);
+		}
+	} else {
+		/* chunk_id == 0, so it is an ObjectHeader.
+		 * Thus, we read in the object header and make
+		 * the object
+		 */
+		*found_chunks = 1;
+
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+
+		oh = NULL;
+		in = NULL;
+
+		if (tags.extra_available) {
+			in = yaffs_find_or_create_by_number(dev,
+					tags.obj_id,
+					tags.extra_obj_type);
+			if (!in)
+				alloc_failed = 1;
+		}
+
+		if (!in ||
+		    (!in->valid && dev->param.disable_lazy_load) ||
+		    tags.extra_shadows ||
+		    (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+				 tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND))) {
+
+			/* If we don't have  valid info then we
+			 * need to read the chunk
+			 * TODO In future we can probably defer
+			 * reading the chunk and living with
+			 * invalid data until needed.
+			 */
+
+			result = yaffs_rd_chunk_tags_nand(dev,
+						  chunk,
+						  chunk_data,
+						  NULL);
+
+			oh = (struct yaffs_obj_hdr *)chunk_data;
+
+			if (dev->param.inband_tags) {
+				/* Fix up the header if they got
+				 * corrupted by inband tags */
+				oh->shadows_obj =
+				    oh->inband_shadowed_obj_id;
+				oh->is_shrink =
+				    oh->inband_is_shrink;
+			}
+
+			if (!in) {
+				in = yaffs_find_or_create_by_number(dev,
+							tags.obj_id, oh->type);
+				if (!in)
+					alloc_failed = 1;
+			}
+		}
+
+		if (!in) {
+			/* TODO Hoosterman we have a problem! */
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy: Could not make object for object  %d at chunk %d during scan",
+				tags.obj_id, chunk);
+			return YAFFS_FAIL;
+		}
+
+		if (in->valid) {
+			/* We have already filled this one.
+			 * We have a duplicate that will be
+			 * discarded, but we first have to suck
+			 * out resize info if it is a file.
+			 */
+			if ((in->variant_type == YAFFS_OBJECT_TYPE_FILE) &&
+				((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
+				 (tags.extra_available &&
+				  tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+				)) {
+				loff_t this_size = (oh) ?
+					yaffs_oh_to_size(oh) :
+					tags.extra_file_size;
+				u32 parent_obj_id = (oh) ?
+					oh->parent_obj_id :
+					tags.extra_parent_id;
+
+				is_shrink = (oh) ?
+					oh->is_shrink :
+					tags.extra_is_shrink;
+
+				/* If it is deleted (unlinked
+				 * at start also means deleted)
+				 * we treat the file size as
+				 * being zeroed at this point.
+				 */
+				if (parent_obj_id == YAFFS_OBJECTID_DELETED ||
+				    parent_obj_id == YAFFS_OBJECTID_UNLINKED) {
+					this_size = 0;
+					is_shrink = 1;
+				}
+
+				if (is_shrink &&
+				    in->variant.file_variant.shrink_size >
+				    this_size)
+					in->variant.file_variant.shrink_size =
+					this_size;
+
+				if (is_shrink)
+					bi->has_shrink_hdr = 1;
+			}
+			/* Use existing - destroy this one. */
+			yaffs_chunk_del(dev, chunk, 1, __LINE__);
+		}
+
+		if (!in->valid && in->variant_type !=
+		    (oh ? oh->type : tags.extra_obj_type))
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy: Bad object type, %d != %d, for object %d at chunk %d during scan",
+				oh ? oh->type : tags.extra_obj_type,
+				in->variant_type, tags.obj_id,
+				chunk);
+
+		if (!in->valid &&
+		    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+		     tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) {
+			/* We only load some info, don't fiddle
+			 * with directory structure */
+			in->valid = 1;
+
+			if (oh) {
+				in->yst_mode = oh->yst_mode;
+				yaffs_load_attribs(in, oh);
+				in->lazy_loaded = 0;
+			} else {
+				in->lazy_loaded = 1;
+			}
+			in->hdr_chunk = chunk;
+
+		} else if (!in->valid) {
+			/* we need to load this info */
+			in->valid = 1;
+			in->hdr_chunk = chunk;
+			if (oh) {
+				in->variant_type = oh->type;
+				in->yst_mode = oh->yst_mode;
+				yaffs_load_attribs(in, oh);
+
+				if (oh->shadows_obj > 0)
+					yaffs_handle_shadowed_obj(dev,
+					     oh->shadows_obj, 1);
+
+				yaffs_set_obj_name_from_oh(in, oh);
+				parent = yaffs_find_or_create_by_number(dev,
+						oh->parent_obj_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+				file_size = yaffs_oh_to_size(oh);
+				is_shrink = oh->is_shrink;
+				equiv_id = oh->equiv_id;
+			} else {
+				in->variant_type = tags.extra_obj_type;
+				parent = yaffs_find_or_create_by_number(dev,
+						tags.extra_parent_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+				file_size = tags.extra_file_size;
+				is_shrink = tags.extra_is_shrink;
+				equiv_id = tags.extra_equiv_id;
+				in->lazy_loaded = 1;
+			}
+			in->dirty = 0;
+
+			if (!parent)
+				alloc_failed = 1;
+
+			/* directory stuff...
+			 * hook up to parent
+			 */
+
+			if (parent &&
+			    parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) {
+				/* Set up as a directory */
+				parent->variant_type =
+					YAFFS_OBJECT_TYPE_DIRECTORY;
+				INIT_LIST_HEAD(&parent->
+						variant.dir_variant.children);
+			} else if (!parent ||
+				   parent->variant_type !=
+					YAFFS_OBJECT_TYPE_DIRECTORY) {
+				/* Hoosterman, another problem....
+				 * Trying to use a non-directory as a directory
+				 */
+
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+					);
+				parent = dev->lost_n_found;
+			}
+			yaffs_add_obj_to_dir(parent, in);
+
+			is_unlinked = (parent == dev->del_dir) ||
+					(parent == dev->unlinked_dir);
+
+			if (is_shrink)
+				/* Mark the block */
+				bi->has_shrink_hdr = 1;
+
+			/* Note re hardlinks.
+			 * Since we might scan a hardlink before its equivalent
+			 * object is scanned we put them all in a list.
+			 * After scanning is complete, we should have all the
+			 * objects, so we run through this list and fix up all
+			 * the chains.
+			 */
+
+			switch (in->variant_type) {
+			case YAFFS_OBJECT_TYPE_UNKNOWN:
+				/* Todo got a problem */
+				break;
+			case YAFFS_OBJECT_TYPE_FILE:
+				file_var = &in->variant.file_variant;
+				if (file_var->scanned_size < file_size) {
+					/* This covers the case where the file
+					 * size is greater than the data held.
+					 * This will happen if the file is
+					 * resized to be larger than its
+					 * current data extents.
+					 */
+					file_var->file_size = file_size;
+					file_var->scanned_size = file_size;
+				}
+
+				if (file_var->shrink_size > file_size)
+					file_var->shrink_size = file_size;
+
+				break;
+			case YAFFS_OBJECT_TYPE_HARDLINK:
+				hl_var = &in->variant.hardlink_variant;
+				if (!is_unlinked) {
+					hl_var->equiv_id = equiv_id;
+					list_add(&in->hard_links, hard_list);
+				}
+				break;
+			case YAFFS_OBJECT_TYPE_DIRECTORY:
+				/* Do nothing */
+				break;
+			case YAFFS_OBJECT_TYPE_SPECIAL:
+				/* Do nothing */
+				break;
+			case YAFFS_OBJECT_TYPE_SYMLINK:
+				sl_var = &in->variant.symlink_variant;
+				if (oh) {
+					sl_var->alias =
+					    yaffs_clone_str(oh->alias);
+					if (!sl_var->alias)
+						alloc_failed = 1;
+				}
+				break;
+			}
+		}
+	}
+	return alloc_failed ? YAFFS_FAIL : YAFFS_OK;
+}
+
+int yaffs2_scan_backwards(struct yaffs_dev *dev)
+{
+	int blk;
+	int block_iter;
+	int start_iter;
+	int end_iter;
+	int n_to_scan = 0;
+	enum yaffs_block_state state;
+	int c;
+	int deleted;
+	LIST_HEAD(hard_list);
+	struct yaffs_block_info *bi;
+	u32 seq_number;
+	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+	u8 *chunk_data;
+	int found_chunks;
+	int alloc_failed = 0;
+	struct yaffs_block_index *block_index = NULL;
+	int alt_block_index = 0;
+	int summary_available;
+
+	yaffs_trace(YAFFS_TRACE_SCAN,
+		"yaffs2_scan_backwards starts  intstartblk %d intendblk %d...",
+		dev->internal_start_block, dev->internal_end_block);
+
+	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	block_index =
+		kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS);
+
+	if (!block_index) {
+		block_index =
+		    vmalloc(n_blocks * sizeof(struct yaffs_block_index));
+		alt_block_index = 1;
+	}
+
+	if (!block_index) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"yaffs2_scan_backwards() could not allocate block index!"
+			);
+		return YAFFS_FAIL;
+	}
+
+	dev->blocks_in_checkpt = 0;
+
+	chunk_data = yaffs_get_temp_buffer(dev);
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->block_info;
+	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+	     blk++) {
+		yaffs_clear_chunk_bits(dev, blk);
+		bi->pages_in_use = 0;
+		bi->soft_del_pages = 0;
+
+		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+		bi->block_state = state;
+		bi->seq_number = seq_number;
+
+		if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+			bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+
+		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+			"Block scanning block %d state %d seq %d",
+			blk, bi->block_state, seq_number);
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			dev->blocks_in_checkpt++;
+
+		} else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) {
+			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+				"block %d is bad", blk);
+		} else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+			dev->n_erased_blocks++;
+			dev->n_free_chunks += dev->param.chunks_per_block;
+		} else if (bi->block_state ==
+				YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* Determine the highest sequence number */
+			if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+				block_index[n_to_scan].seq = seq_number;
+				block_index[n_to_scan].block = blk;
+				n_to_scan++;
+				if (seq_number >= dev->seq_number)
+					dev->seq_number = seq_number;
+			} else {
+				/* TODO: Nasty sequence number! */
+				yaffs_trace(YAFFS_TRACE_SCAN,
+					"Block scanning block %d has bad sequence number %d",
+					blk, seq_number);
+			}
+		}
+		bi++;
+	}
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "%d blocks to be sorted...", n_to_scan);
+
+	cond_resched();
+
+	/* Sort the blocks by sequence number */
+	sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
+		   yaffs2_ybicmp, NULL);
+
+	cond_resched();
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "...done");
+
+	/* Now scan the blocks looking at the data. */
+	start_iter = 0;
+	end_iter = n_to_scan - 1;
+	yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan);
+
+	/* For each block.... backwards */
+	for (block_iter = end_iter;
+	     !alloc_failed && block_iter >= start_iter;
+	     block_iter--) {
+		/* Cooperative multitasking! This loop can run for so
+		   long that watchdog timers expire. */
+		cond_resched();
+
+		/* get the block to scan in the correct order */
+		blk = block_index[block_iter].block;
+		bi = yaffs_get_block_info(dev, blk);
+		deleted = 0;
+
+		summary_available = yaffs_summary_read(dev, dev->sum_tags, blk);
+
+		/* For each chunk in each block that needs scanning.... */
+		found_chunks = 0;
+		if (summary_available)
+			c = dev->chunks_per_summary - 1;
+		else
+			c = dev->param.chunks_per_block - 1;
+
+		for (/* c is already initialised */;
+		     !alloc_failed && c >= 0 &&
+		     (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+		      bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING);
+		      c--) {
+			/* Scan backwards...
+			 * Read the tags and decide what to do
+			 */
+			if (yaffs2_scan_chunk(dev, bi, blk, c,
+					&found_chunks, chunk_data,
+					&hard_list, summary_available) ==
+					YAFFS_FAIL)
+				alloc_failed = 1;
+		}
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* If we got this far while scanning, then the block
+			 * is fully allocated. */
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		/* Now let's see if it was dirty */
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_block_became_dirty(dev, blk);
+		}
+	}
+
+	yaffs_skip_rest_of_block(dev);
+
+	if (alt_block_index)
+		vfree(block_index);
+	else
+		kfree(block_index);
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We have scanned all the objects, now it's time to add these
+	 * hardlinks.
+	 */
+	yaffs_link_fixup(dev, &hard_list);
+
+	yaffs_release_temp_buffer(dev, chunk_data);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends");
+
+	return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_yaffs2.h b/fs/yaffs2/yaffs_yaffs2.h
new file mode 100644
index 0000000..2363bfd
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.h
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+				   struct yaffs_block_info *bi);
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+				    struct yaffs_block_info *bi);
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi);
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev);
+int yaffs2_checkpt_required(struct yaffs_dev *dev);
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev);
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev);
+int yaffs2_checkpt_save(struct yaffs_dev *dev);
+int yaffs2_checkpt_restore(struct yaffs_dev *dev);
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size);
+int yaffs2_scan_backwards(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffscfg.c b/fs/yaffs2/yaffscfg.c
deleted file mode 100644
index 01399ea..0000000
--- a/fs/yaffs2/yaffscfg.c
+++ /dev/null
@@ -1,420 +0,0 @@
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2007 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- * yaffscfg.c  The configuration for the "direct" use of yaffs.
- *
- * This file is intended to be modified to your requirements.
- * There is no need to redistribute this file.
- */
-
-/* XXX U-BOOT XXX */
-#include <common.h>
-
-#include <config.h>
-#include "nand.h"
-#include "yaffscfg.h"
-#include "yaffsfs.h"
-#include "yaffs_packedtags2.h"
-#include "yaffs_mtdif.h"
-#include "yaffs_mtdif2.h"
-#if 0
-#include <errno.h>
-#else
-#include "malloc.h"
-#endif
-
-unsigned yaffs_traceMask = 0x0; /* Disable logging */
-static int yaffs_errno = 0;
-
-void yaffsfs_SetError(int err)
-{
-	//Do whatever to set error
-	yaffs_errno = err;
-}
-
-int yaffsfs_GetError(void)
-{
-	return yaffs_errno;
-}
-
-void yaffsfs_Lock(void)
-{
-}
-
-void yaffsfs_Unlock(void)
-{
-}
-
-__u32 yaffsfs_CurrentTime(void)
-{
-	return 0;
-}
-
-void *yaffs_malloc(size_t size)
-{
-	return malloc(size);
-}
-
-void yaffs_free(void *ptr)
-{
-	free(ptr);
-}
-
-void yaffsfs_LocalInitialisation(void)
-{
-	// Define locking semaphore.
-}
-
-// Configuration for:
-// /ram  2MB ramdisk
-// /boot 2MB boot disk (flash)
-// /flash 14MB flash disk (flash)
-// NB Though /boot and /flash occupy the same physical device they
-// are still disticnt "yaffs_Devices. You may think of these as "partitions"
-// using non-overlapping areas in the same device.
-//
-
-#include "yaffs_ramdisk.h"
-#include "yaffs_flashif.h"
-
-static int isMounted = 0;
-#define MOUNT_POINT "/flash"
-extern nand_info_t nand_info[];
-
-/* XXX U-BOOT XXX */
-#if 0
-static yaffs_Device ramDev;
-static yaffs_Device bootDev;
-static yaffs_Device flashDev;
-#endif
-
-static yaffsfs_DeviceConfiguration yaffsfs_config[] = {
-/* XXX U-BOOT XXX */
-#if 0
-	{ "/ram", &ramDev},
-	{ "/boot", &bootDev},
-	{ "/flash", &flashDev},
-#else
-	{ MOUNT_POINT, 0},
-#endif
-	{(void *)0,(void *)0}
-};
-
-
-int yaffs_StartUp(void)
-{
-	struct mtd_info *mtd = &nand_info[0];
-	int yaffsVersion = 2;
-	int nBlocks;
-
-	yaffs_Device *flashDev = calloc(1, sizeof(yaffs_Device));
-	yaffsfs_config[0].dev = flashDev;
-
-	/* store the mtd device for later use */
-	flashDev->genericDevice = mtd;
-
-	// Stuff to configure YAFFS
-	// Stuff to initialise anything special (eg lock semaphore).
-	yaffsfs_LocalInitialisation();
-
-	// Set up devices
-
-/* XXX U-BOOT XXX */
-#if 0
-	// /ram
-	ramDev.nBytesPerChunk = 512;
-	ramDev.nChunksPerBlock = 32;
-	ramDev.nReservedBlocks = 2; // Set this smaller for RAM
-	ramDev.startBlock = 1; // Can't use block 0
-	ramDev.endBlock = 127; // Last block in 2MB.
-	ramDev.useNANDECC = 1;
-	ramDev.nShortOpCaches = 0;	// Disable caching on this device.
-	ramDev.genericDevice = (void *) 0;	// Used to identify the device in fstat.
-	ramDev.writeChunkWithTagsToNAND = yramdisk_WriteChunkWithTagsToNAND;
-	ramDev.readChunkWithTagsFromNAND = yramdisk_ReadChunkWithTagsFromNAND;
-	ramDev.eraseBlockInNAND = yramdisk_EraseBlockInNAND;
-	ramDev.initialiseNAND = yramdisk_InitialiseNAND;
-
-	// /boot
-	bootDev.nBytesPerChunk = 612;
-	bootDev.nChunksPerBlock = 32;
-	bootDev.nReservedBlocks = 5;
-	bootDev.startBlock = 1; // Can't use block 0
-	bootDev.endBlock = 127; // Last block in 2MB.
-	bootDev.useNANDECC = 0; // use YAFFS's ECC
-	bootDev.nShortOpCaches = 10; // Use caches
-	bootDev.genericDevice = (void *) 1;	// Used to identify the device in fstat.
-	bootDev.writeChunkToNAND = yflash_WriteChunkToNAND;
-	bootDev.readChunkFromNAND = yflash_ReadChunkFromNAND;
-	bootDev.eraseBlockInNAND = yflash_EraseBlockInNAND;
-	bootDev.initialiseNAND = yflash_InitialiseNAND;
-#endif
-
-		// /flash
-	flashDev->nReservedBlocks = 5;
-//  flashDev->nShortOpCaches = (options.no_cache) ? 0 : 10;
-	flashDev->nShortOpCaches = 10; // Use caches
-	flashDev->useNANDECC = 0; // do not use YAFFS's ECC
-
-	if (yaffsVersion == 2)
-	{
-		flashDev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
-		flashDev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
-		flashDev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
-		flashDev->queryNANDBlock = nandmtd2_QueryNANDBlock;
-		flashDev->spareBuffer = YMALLOC(mtd->oobsize);
-		flashDev->isYaffs2 = 1;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-		flashDev->nDataBytesPerChunk = mtd->writesize;
-		flashDev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
-#else
-		flashDev->nDataBytesPerChunk = mtd->oobblock;
-		flashDev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
-#endif
-		nBlocks = mtd->size / mtd->erasesize;
-
-		flashDev->nCheckpointReservedBlocks = 10;
-		flashDev->startBlock = 0;
-		flashDev->endBlock = nBlocks - 1;
-	}
-	else
-	{
-		flashDev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
-		flashDev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
-		flashDev->isYaffs2 = 0;
-		nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
-		flashDev->startBlock = 320;
-		flashDev->endBlock = nBlocks - 1;
-		flashDev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
-		flashDev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
-	}
-
-	/* ... and common functions */
-	flashDev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
-	flashDev->initialiseNAND = nandmtd_InitialiseNAND;
-
-	yaffs_initialise(yaffsfs_config);
-
-	return 0;
-}
-
-
-void make_a_file(char *yaffsName,char bval,int sizeOfFile)
-{
-	int outh;
-	int i;
-	unsigned char buffer[100];
-
-	outh = yaffs_open(yaffsName, O_CREAT | O_RDWR | O_TRUNC, S_IREAD | S_IWRITE);
-	if (outh < 0)
-	{
-		printf("Error opening file: %d\n", outh);
-		return;
-	}
-
-	memset(buffer,bval,100);
-
-	do{
-		i = sizeOfFile;
-		if(i > 100) i = 100;
-		sizeOfFile -= i;
-
-		yaffs_write(outh,buffer,i);
-
-	} while (sizeOfFile > 0);
-
-
-	yaffs_close(outh);
-}
-
-void read_a_file(char *fn)
-{
-	int h;
-	int i = 0;
-	unsigned char b;
-
-	h = yaffs_open(fn, O_RDWR,0);
-	if(h<0)
-	{
-		printf("File not found\n");
-		return;
-	}
-
-	while(yaffs_read(h,&b,1)> 0)
-	{
-		printf("%02x ",b);
-		i++;
-		if(i > 32)
-		{
-		   printf("\n");
-		   i = 0;;
-		 }
-	}
-	printf("\n");
-	yaffs_close(h);
-}
-
-void cmd_yaffs_mount(char *mp)
-{
-	yaffs_StartUp();
-	int retval = yaffs_mount(mp);
-	if( retval != -1)
-		isMounted = 1;
-	else
-		printf("Error mounting %s, return value: %d\n", mp, yaffsfs_GetError());
-}
-
-static void checkMount(void)
-{
-	if( !isMounted )
-	{
-		cmd_yaffs_mount(MOUNT_POINT);
-	}
-}
-
-void cmd_yaffs_umount(char *mp)
-{
-	checkMount();
-	if( yaffs_unmount(mp) == -1)
-		printf("Error umounting %s, return value: %d\n", mp, yaffsfs_GetError());
-}
-
-void cmd_yaffs_write_file(char *yaffsName,char bval,int sizeOfFile)
-{
-	checkMount();
-	make_a_file(yaffsName,bval,sizeOfFile);
-}
-
-
-void cmd_yaffs_read_file(char *fn)
-{
-	checkMount();
-	read_a_file(fn);
-}
-
-
-void cmd_yaffs_mread_file(char *fn, char *addr)
-{
-	int h;
-	struct yaffs_stat s;
-
-	checkMount();
-
-	yaffs_stat(fn,&s);
-
-	printf ("Copy %s to 0x%p... ", fn, addr);
-	h = yaffs_open(fn, O_RDWR,0);
-	if(h<0)
-	{
-		printf("File not found\n");
-		return;
-	}
-
-	yaffs_read(h,addr,(int)s.st_size);
-	printf("\t[DONE]\n");
-
-	yaffs_close(h);
-}
-
-
-void cmd_yaffs_mwrite_file(char *fn, char *addr, int size)
-{
-	int outh;
-
-	checkMount();
-	outh = yaffs_open(fn, O_CREAT | O_RDWR | O_TRUNC, S_IREAD | S_IWRITE);
-	if (outh < 0)
-	{
-		printf("Error opening file: %d\n", outh);
-	}
-
-	yaffs_write(outh,addr,size);
-
-	yaffs_close(outh);
-}
-
-
-void cmd_yaffs_ls(const char *mountpt, int longlist)
-{
-	int i;
-	yaffs_DIR *d;
-	yaffs_dirent *de;
-	struct yaffs_stat stat;
-	char tempstr[255];
-
-	checkMount();
-	d = yaffs_opendir(mountpt);
-
-	if(!d)
-	{
-		printf("opendir failed\n");
-	}
-	else
-	{
-		for(i = 0; (de = yaffs_readdir(d)) != NULL; i++)
-		{
-			if (longlist)
-			{
-				sprintf(tempstr, "%s/%s", mountpt, de->d_name);
-				yaffs_stat(tempstr, &stat);
-				printf("%-25s\t%7ld\n",de->d_name, stat.st_size);
-			}
-			else
-			{
-				printf("%s\n",de->d_name);
-			}
-		}
-	}
-}
-
-
-void cmd_yaffs_mkdir(const char *dir)
-{
-	checkMount();
-
-	int retval = yaffs_mkdir(dir, 0);
-
-	if ( retval < 0)
-		printf("yaffs_mkdir returning error: %d\n", retval);
-}
-
-void cmd_yaffs_rmdir(const char *dir)
-{
-	checkMount();
-
-	int retval = yaffs_rmdir(dir);
-
-	if ( retval < 0)
-		printf("yaffs_rmdir returning error: %d\n", retval);
-}
-
-void cmd_yaffs_rm(const char *path)
-{
-	checkMount();
-
-	int retval = yaffs_unlink(path);
-
-	if ( retval < 0)
-		printf("yaffs_unlink returning error: %d\n", retval);
-}
-
-void cmd_yaffs_mv(const char *oldPath, const char *newPath)
-{
-	checkMount();
-
-	int retval = yaffs_rename(newPath, oldPath);
-
-	if ( retval < 0)
-		printf("yaffs_unlink returning error: %d\n", retval);
-}
diff --git a/fs/yaffs2/yaffscfg.h b/fs/yaffs2/yaffscfg.h
index 3503dc8..718504e 100644
--- a/fs/yaffs2/yaffscfg.h
+++ b/fs/yaffs2/yaffscfg.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -23,23 +23,16 @@
 #define __YAFFSCFG_H__
 
 
-#include "devextras.h"
+#include "yportenv.h"
 
-#define YAFFSFS_N_HANDLES 200
+#define YAFFSFS_N_HANDLES	100
+#define YAFFSFS_N_DSC		20
 
 
-typedef struct {
-	const char *prefix;
-	struct yaffs_DeviceStruct *dev;
-} yaffsfs_DeviceConfiguration;
+struct yaffsfs_DeviceConfiguration {
+	const YCHAR *prefix;
+	struct yaffs_dev *dev;
+};
 
 
-void yaffsfs_Lock(void);
-void yaffsfs_Unlock(void);
-
-__u32 yaffsfs_CurrentTime(void);
-
-void yaffsfs_SetError(int err);
-int yaffsfs_GetError(void);
-
 #endif
diff --git a/fs/yaffs2/yaffsfs.c b/fs/yaffs2/yaffsfs.c
index 111cb34..9f1397b 100644
--- a/fs/yaffs2/yaffsfs.c
+++ b/fs/yaffs2/yaffsfs.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,19 +11,13 @@
  * published by the Free Software Foundation.
  */
 
-/* XXX U-BOOT XXX */
-#include <common.h>
-#include <malloc.h>
-
 #include "yaffsfs.h"
 #include "yaffs_guts.h"
 #include "yaffscfg.h"
 #include "yportenv.h"
+#include "yaffs_trace.h"
 
-/* XXX U-BOOT XXX */
-#if 0
-#include <string.h> // for memset
-#endif
+#include "string.h"
 
 #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
 
@@ -31,452 +25,968 @@
 #define NULL ((void *)0)
 #endif
 
+/* YAFFSFS_RW_SIZE must be a power of 2 */
+#define YAFFSFS_RW_SHIFT (13)
+#define YAFFSFS_RW_SIZE  (1<<YAFFSFS_RW_SHIFT)
 
-const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.18 2007/07/18 19:40:38 charles Exp $";
-
-// configurationList is the list of devices that are supported
-static yaffsfs_DeviceConfiguration *yaffsfs_configurationList;
+/* Some forward references */
+static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory,
+					    const YCHAR *path,
+					    int symDepth, int getEquiv,
+					    struct yaffs_obj **dirOut,
+					    int *notDir, int *loop);
 
+static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
 
-/* Some forward references */
-static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth);
-static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj);
+unsigned int yaffs_wr_attempts;
 
+/*
+ * Handle management.
+ * There are open inodes in struct yaffsfs_Inode.
+ * There are open file descriptors in yaffsfs_FileDes.
+ * There are open handles in yaffsfs_FileDes.
+ *
+ * Things are structured this way to be like the Linux VFS model
+ * so that interactions with the yaffs guts calls are similar.
+ * That means more common code paths and less special code.
+ * That means better testing etc.
+ *
+ * We have 3 layers because:
+ * A handle is different than an fd because you can use dup()
+ * to create a new handle that accesses the *same* fd. The two
+ * handles will use the same offset (part of the fd). We only close
+ * down the fd when there are no more handles accessing it.
+ *
+ * More than one fd can currently access one file, but each fd
+ * has its own permsiions and offset.
+ */
 
-// Handle management.
-//
+struct yaffsfs_Inode {
+	int count;		/* Number of handles accessing this inode */
+	struct yaffs_obj *iObj;
+};
+
+struct yaffsfs_FileDes {
+	u8 reading:1;
+	u8 writing:1;
+	u8 append:1;
+	u8 shareRead:1;
+	u8 shareWrite:1;
+	int inodeId:12;		/* Index to corresponding yaffsfs_Inode */
+	int handleCount:10;	/* Number of handles for this fd */
+	loff_t position;	/* current position in file */
+};
+
+struct yaffsfs_Handle {
+	short int fdId;
+	short int useCount;
+};
+
+
+struct yaffsfs_DirSearchContxt {
+	struct yaffs_dirent de;	/* directory entry */
+	YCHAR name[NAME_MAX + 1];	/* name of directory being searched */
+	struct yaffs_obj *dirObj;	/* ptr to directory being searched */
+	struct yaffs_obj *nextReturn;	/* obj  returned by next readddir */
+	struct list_head others;
+	int offset:20;
+	unsigned inUse:1;
+};
 
+static struct yaffsfs_DirSearchContxt yaffsfs_dsc[YAFFSFS_N_DSC];
+static struct yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
+static struct yaffsfs_FileDes yaffsfs_fd[YAFFSFS_N_HANDLES];
+static struct yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
 
-unsigned int yaffs_wr_attempts;
+static int yaffsfs_handlesInitialised;
 
-typedef struct
+unsigned yaffs_set_trace(unsigned tm)
 {
-	__u8  inUse:1;		// this handle is in use
-	__u8  readOnly:1;	// this handle is read only
-	__u8  append:1;		// append only
-	__u8  exclusive:1;	// exclusive
-	__u32 position;		// current position in file
-	yaffs_Object *obj;	// the object
-}yaffsfs_Handle;
+	yaffs_trace_mask = tm;
+	return yaffs_trace_mask;
+}
 
+unsigned yaffs_get_trace(void)
+{
+	return yaffs_trace_mask;
+}
 
-static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
+/*
+ * yaffsfs_InitHandle
+ * Inilitalise handle management on start-up.
+ */
 
-// yaffsfs_InitHandle
-/// Inilitalise handles on start-up.
-//
-static int yaffsfs_InitHandles(void)
+static void yaffsfs_InitHandles(void)
 {
 	int i;
-	for(i = 0; i < YAFFSFS_N_HANDLES; i++)
-	{
-		yaffsfs_handle[i].inUse = 0;
-		yaffsfs_handle[i].obj = NULL;
-	}
-	return 0;
+	if (yaffsfs_handlesInitialised)
+		return;
+
+	memset(yaffsfs_inode, 0, sizeof(yaffsfs_inode));
+	memset(yaffsfs_fd, 0, sizeof(yaffsfs_fd));
+	memset(yaffsfs_handle, 0, sizeof(yaffsfs_handle));
+	memset(yaffsfs_dsc, 0, sizeof(yaffsfs_dsc));
+
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++)
+		yaffsfs_fd[i].inodeId = -1;
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++)
+		yaffsfs_handle[i].fdId = -1;
 }
 
-yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
+static struct yaffsfs_Handle *yaffsfs_HandleToPointer(int h)
 {
-	if(h < 0 || h >= YAFFSFS_N_HANDLES)
-	{
-		return NULL;
-	}
+	if (h >= 0 && h < YAFFSFS_N_HANDLES)
+		return &yaffsfs_handle[h];
+	return NULL;
+}
+
+static struct yaffsfs_FileDes *yaffsfs_HandleToFileDes(int handle)
+{
+	struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
+
+	if (h && h->useCount > 0 && h->fdId >= 0 && h->fdId < YAFFSFS_N_HANDLES)
+		return &yaffsfs_fd[h->fdId];
 
-	return &yaffsfs_handle[h];
+	return NULL;
 }
 
-yaffs_Object *yaffsfs_GetHandleObject(int handle)
+static struct yaffsfs_Inode *yaffsfs_HandleToInode(int handle)
 {
-	yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
+	struct yaffsfs_FileDes *fd = yaffsfs_HandleToFileDes(handle);
 
-	if(h && h->inUse)
-	{
-		return h->obj;
-	}
+	if (fd && fd->handleCount > 0 &&
+	    fd->inodeId >= 0 && fd->inodeId < YAFFSFS_N_HANDLES)
+		return &yaffsfs_inode[fd->inodeId];
 
 	return NULL;
 }
 
+static struct yaffs_obj *yaffsfs_HandleToObject(int handle)
+{
+	struct yaffsfs_Inode *in = yaffsfs_HandleToInode(handle);
+
+	if (in)
+		return in->iObj;
+
+	return NULL;
+}
+
+/*
+ * yaffsfs_FindInodeIdForObject
+ * Find the inode entry for an object, if it exists.
+ */
 
-//yaffsfs_GetHandle
-// Grab a handle (when opening a file)
-//
+static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
+{
+	int i;
+	int ret = -1;
+
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	/* Look for it in open inode table */
+	for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
+		if (yaffsfs_inode[i].iObj == obj)
+			ret = i;
+	}
+	return ret;
+}
 
-static int yaffsfs_GetHandle(void)
+/*
+ * yaffsfs_GetInodeIdForObject
+ * Grab an inode entry when opening a new inode.
+ */
+static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
 {
 	int i;
-	yaffsfs_Handle *h;
-
-	for(i = 0; i < YAFFSFS_N_HANDLES; i++)
-	{
-		h = yaffsfs_GetHandlePointer(i);
-		if(!h)
-		{
-			// todo bug: should never happen
+	int ret;
+	struct yaffsfs_Inode *in = NULL;
+
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	ret = yaffsfs_FindInodeIdForObject(obj);
+
+	for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
+		if (!yaffsfs_inode[i].iObj)
+			ret = i;
+	}
+
+	if (ret >= 0) {
+		in = &yaffsfs_inode[ret];
+		if (!in->iObj)
+			in->count = 0;
+		in->iObj = obj;
+		in->count++;
+	}
+
+	return ret;
+}
+
+static int yaffsfs_CountHandles(struct yaffs_obj *obj)
+{
+	int i = yaffsfs_FindInodeIdForObject(obj);
+
+	if (i >= 0)
+		return yaffsfs_inode[i].count;
+	else
+		return 0;
+}
+
+static void yaffsfs_ReleaseInode(struct yaffsfs_Inode *in)
+{
+	struct yaffs_obj *obj;
+
+	obj = in->iObj;
+
+	if (obj->unlinked)
+		yaffs_del_obj(obj);
+
+	obj->my_inode = NULL;
+	in->iObj = NULL;
+
+}
+
+static void yaffsfs_PutInode(int inodeId)
+{
+	if (inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES) {
+		struct yaffsfs_Inode *in = &yaffsfs_inode[inodeId];
+		in->count--;
+		if (in->count <= 0) {
+			yaffsfs_ReleaseInode(in);
+			in->count = 0;
 		}
-		if(!h->inUse)
-		{
-			memset(h,0,sizeof(yaffsfs_Handle));
-			h->inUse=1;
+	}
+}
+
+static int yaffsfs_NewHandle(struct yaffsfs_Handle **hptr)
+{
+	int i;
+	struct yaffsfs_Handle *h;
+
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		h = &yaffsfs_handle[i];
+		if (h->useCount < 1) {
+			memset(h, 0, sizeof(struct yaffsfs_Handle));
+			h->fdId = -1;
+			h->useCount = 1;
+			if (hptr)
+				*hptr = h;
 			return i;
 		}
 	}
 	return -1;
 }
 
-// yaffs_PutHandle
-// Let go of a handle (when closing a file)
-//
-static int yaffsfs_PutHandle(int handle)
+static int yaffsfs_NewHandleAndFileDes(void)
 {
-	yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
+	int i;
+	struct yaffsfs_FileDes *fd;
+	struct yaffsfs_Handle *h = NULL;
+	int handle = yaffsfs_NewHandle(&h);
+
+	if (handle < 0)
+		return -1;
+
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		fd = &yaffsfs_fd[i];
+		if (fd->handleCount < 1) {
+			memset(fd, 0, sizeof(struct yaffsfs_FileDes));
+			fd->inodeId = -1;
+			fd->handleCount = 1;
+			h->fdId = i;
+			return handle;
+		}
+	}
+
+	/* Dump the handle because we could not get a fd */
+	h->useCount = 0;
+	return -1;
+}
+
+/*
+ * yaffs_get_handle
+ * Increase use of handle when reading/writing a file
+ * Also gets the file descriptor.
+ */
+
+static int yaffsfs_GetHandle(int handle)
+{
+	struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
+
+	if (h && h->useCount > 0) {
+		h->useCount++;
+		return 0;
+	}
+	return -1;
+}
+
+/*
+ * yaffs_put_handle
+ * Let go of a handle when closing a file or aborting an open or
+ * ending a read or write.
+ */
 
-	if(h)
-	{
-		h->inUse = 0;
-		h->obj = NULL;
+static int yaffsfs_PutFileDes(int fdId)
+{
+	struct yaffsfs_FileDes *fd;
+
+	if (fdId >= 0 && fdId < YAFFSFS_N_HANDLES) {
+		fd = &yaffsfs_fd[fdId];
+		fd->handleCount--;
+		if (fd->handleCount < 1) {
+			if (fd->inodeId >= 0) {
+				yaffsfs_PutInode(fd->inodeId);
+				fd->inodeId = -1;
+			}
+		}
 	}
 	return 0;
 }
 
+static int yaffsfs_PutHandle(int handle)
+{
+	struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
 
+	if (h && h->useCount > 0) {
+		h->useCount--;
+		if (h->useCount < 1) {
+			yaffsfs_PutFileDes(h->fdId);
+			h->fdId = -1;
+		}
+	}
 
-// Stuff to search for a directory from a path
+	return 0;
+}
 
+static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
+{
+	struct yaffsfs_FileDes *fd;
+	struct yaffsfs_Handle *h;
+	struct yaffs_obj *obj;
+	int i;
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		h = yaffsfs_HandleToPointer(i);
+		fd = yaffsfs_HandleToFileDes(i);
+		obj = yaffsfs_HandleToObject(i);
+		if (h && h->useCount > 0) {
+			h->useCount = 0;
+			h->fdId = 0;
+		}
+		if (fd && fd->handleCount > 0 && obj && obj->my_dev == dev) {
+			fd->handleCount = 0;
+			yaffsfs_PutInode(fd->inodeId);
+			fd->inodeId = -1;
+		}
+	}
+}
 
-int yaffsfs_Match(char a, char b)
+/*
+ *  Stuff to handle names.
+ */
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+
+static int yaffs_toupper(YCHAR a)
+{
+	if (a >= 'a' && a <= 'z')
+		return (a - 'a') + 'A';
+	else
+		return a;
+}
+
+int yaffsfs_Match(YCHAR a, YCHAR b)
+{
+	return (yaffs_toupper(a) == yaffs_toupper(b));
+}
+#else
+int yaffsfs_Match(YCHAR a, YCHAR b)
 {
-	// case sensitive
+	/* case sensitive */
 	return (a == b);
 }
+#endif
+
+int yaffsfs_IsPathDivider(YCHAR ch)
+{
+	const YCHAR *str = YAFFS_PATH_DIVIDERS;
+
+	while (*str) {
+		if (*str == ch)
+			return 1;
+		str++;
+	}
+
+	return 0;
+}
+
+int yaffsfs_CheckNameLength(const char *name)
+{
+	int retVal = 0;
+
+	int nameLength = yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH + 1);
+
+	if (nameLength == 0) {
+		yaffsfs_SetError(-ENOENT);
+		retVal = -1;
+	} else if (nameLength > YAFFS_MAX_NAME_LENGTH) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		retVal = -1;
+	}
+
+	return retVal;
+}
+
+static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
+{
+	YCHAR *alt_path = NULL;
+	int path_length;
+	int i;
+
+	/*
+	 * We don't have a definition for max path length.
+	 * We will use 3 * max name length instead.
+	 */
+	*ret_path = NULL;
+	path_length = yaffs_strnlen(path, (YAFFS_MAX_NAME_LENGTH + 1) * 3 + 1);
+
+	/* If the last character is a path divider, then we need to
+	 * trim it back so that the name look-up works properly.
+	 * eg. /foo/new_dir/ -> /foo/newdir
+	 * Curveball: Need to handle multiple path dividers:
+	 * eg. /foof/sdfse///// -> /foo/sdfse
+	 */
+	if (path_length > 0 && yaffsfs_IsPathDivider(path[path_length - 1])) {
+		alt_path = kmalloc(path_length + 1, 0);
+		if (!alt_path)
+			return -1;
+		yaffs_strcpy(alt_path, path);
+		for (i = path_length - 1;
+		     i >= 0 && yaffsfs_IsPathDivider(alt_path[i]); i--)
+			alt_path[i] = (YCHAR) 0;
+	}
+	*ret_path = alt_path;
+	return 0;
+}
+
+LIST_HEAD(yaffsfs_deviceList);
 
-// yaffsfs_FindDevice
-// yaffsfs_FindRoot
-// Scan the configuration list to find the root.
-// Curveballs: Should match paths that end in '/' too
-// Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
-static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath)
+/*
+ * yaffsfs_FindDevice
+ * yaffsfs_FindRoot
+ * Scan the configuration list to find the device
+ * Curveballs: Should match paths that end in '/' too
+ * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
+ */
+static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path,
+					    YCHAR **restOfPath)
 {
-	yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
-	const char *leftOver;
-	const char *p;
-	yaffs_Device *retval = NULL;
+	struct list_head *cfg;
+	const YCHAR *leftOver;
+	const YCHAR *p;
+	struct yaffs_dev *retval = NULL;
+	struct yaffs_dev *dev = NULL;
 	int thisMatchLength;
 	int longestMatch = -1;
+	int matching;
 
-	// Check all configs, choose the one that:
-	// 1) Actually matches a prefix (ie /a amd /abc will not match
-	// 2) Matches the longest.
-	while(cfg && cfg->prefix && cfg->dev)
-	{
+	/*
+	 * Check all configs, choose the one that:
+	 * 1) Actually matches a prefix (ie /a amd /abc will not match
+	 * 2) Matches the longest.
+	 */
+	list_for_each(cfg, &yaffsfs_deviceList) {
+		dev = list_entry(cfg, struct yaffs_dev, dev_list);
 		leftOver = path;
-		p = cfg->prefix;
+		p = dev->param.name;
 		thisMatchLength = 0;
+		matching = 1;
+
+		while (matching && *p && *leftOver) {
+			/* Skip over any /s */
+			while (yaffsfs_IsPathDivider(*p))
+				p++;
+
+			/* Skip over any /s */
+			while (yaffsfs_IsPathDivider(*leftOver))
+				leftOver++;
+
+			/* Now match the text part */
+			while (matching &&
+			       *p && !yaffsfs_IsPathDivider(*p) &&
+			       *leftOver && !yaffsfs_IsPathDivider(*leftOver)) {
+				if (yaffsfs_Match(*p, *leftOver)) {
+					p++;
+					leftOver++;
+					thisMatchLength++;
+				} else {
+					matching = 0;
+				}
+			}
+		}
 
-		while(*p &&  //unmatched part of prefix
-		      strcmp(p,"/") && // the rest of the prefix is not / (to catch / at end)
-		      *leftOver &&
-		      yaffsfs_Match(*p,*leftOver))
-		{
-			p++;
+		/* Skip over any /s in leftOver */
+		while (yaffsfs_IsPathDivider(*leftOver))
 			leftOver++;
-			thisMatchLength++;
-		}
-		if((!*p || strcmp(p,"/") == 0) &&      // end of prefix
-		   (!*leftOver || *leftOver == '/') && // no more in this path name part
-		   (thisMatchLength > longestMatch))
-		{
-			// Matched prefix
-			*restOfPath = (char *)leftOver;
-			retval = cfg->dev;
+
+		/*Skip over any /s in p */
+		while (yaffsfs_IsPathDivider(*p))
+			p++;
+
+		/* p should now be at the end of the string if fully matched */
+		if (*p)
+			matching = 0;
+
+		if (matching && (thisMatchLength > longestMatch)) {
+			/* Matched prefix */
+			*restOfPath = (YCHAR *) leftOver;
+			retval = dev;
 			longestMatch = thisMatchLength;
 		}
-		cfg++;
+
 	}
 	return retval;
 }
 
-static yaffs_Object *yaffsfs_FindRoot(const char *path, char **restOfPath)
+static int yaffsfs_CheckPath(const YCHAR *path)
 {
+	int n = 0;
+	int divs = 0;
 
-	yaffs_Device *dev;
-
-	dev= yaffsfs_FindDevice(path,restOfPath);
-	if(dev && dev->isMounted)
-	{
-		return dev->rootDir;
+	while (*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100) {
+		if (yaffsfs_IsPathDivider(*path)) {
+			n = 0;
+			divs++;
+		} else
+			n++;
+		path++;
 	}
+
+	return (*path) ? -1 : 0;
+}
+
+/* FindMountPoint only returns a dev entry if the path is a mount point */
+static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
+{
+	struct yaffs_dev *dev;
+	YCHAR *restOfPath = NULL;
+
+	dev = yaffsfs_FindDevice(path, &restOfPath);
+	if (dev && restOfPath && *restOfPath)
+		dev = NULL;
+	return dev;
+}
+
+static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path,
+					  YCHAR **restOfPath)
+{
+	struct yaffs_dev *dev;
+
+	dev = yaffsfs_FindDevice(path, restOfPath);
+	if (dev && dev->is_mounted)
+		return dev->root_dir;
+
 	return NULL;
 }
 
-static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
+static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
+					    int symDepth, int *loop)
 {
 
-	while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
-	{
-		char *alias = obj->variant.symLinkVariant.alias;
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
 
-		if(*alias == '/')
-		{
-			// Starts with a /, need to scan from root up
-			obj = yaffsfs_FindObject(NULL,alias,symDepth++);
-		}
+	while (obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		YCHAR *alias = obj->variant.symlink_variant.alias;
+
+		if (yaffsfs_IsPathDivider(*alias))
+			/* Starts with a /, need to scan from root up */
+			obj = yaffsfs_FindObject(NULL, alias, symDepth++,
+						 1, NULL, NULL, loop);
 		else
-		{
-			// Relative to here, so use the parent of the symlink as a start
-			obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
-		}
+			/*
+			 * Relative to here so use the parent of the
+			 * symlink as a start
+			 */
+			obj = yaffsfs_FindObject(obj->parent, alias, symDepth++,
+						 1, NULL, NULL, loop);
 	}
 	return obj;
 }
 
-
-// yaffsfs_FindDirectory
-// Parse a path to determine the directory and the name within the directory.
-//
-// eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
-static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,const char *path,char **name,int symDepth)
+/*
+ * yaffsfs_FindDirectory
+ * Parse a path to determine the directory and the name within the directory.
+ *
+ * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
+ */
+static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
+						 const YCHAR *path,
+						 YCHAR **name, int symDepth,
+						 int *notDir, int *loop)
 {
-	yaffs_Object *dir;
-	char *restOfPath;
-	char str[YAFFS_MAX_NAME_LENGTH+1];
+	struct yaffs_obj *dir;
+	YCHAR *restOfPath;
+	YCHAR str[YAFFS_MAX_NAME_LENGTH + 1];
 	int i;
 
-	if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
-	{
+	if (symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES) {
+		if (loop)
+			*loop = 1;
 		return NULL;
 	}
 
-	if(startDir)
-	{
+	if (startDir) {
 		dir = startDir;
-		restOfPath = (char *)path;
-	}
-	else
-	{
-		dir = yaffsfs_FindRoot(path,&restOfPath);
-	}
-
-	while(dir)
-	{
-		// parse off /.
-		// curve ball: also throw away surplus '/'
-		// eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
-		while(*restOfPath == '/')
-		{
-			restOfPath++; // get rid of '/'
-		}
+		restOfPath = (YCHAR *) path;
+	} else
+		dir = yaffsfs_FindRoot(path, &restOfPath);
+
+	while (dir) {
+		/*
+		 * parse off /.
+		 * curve ball: also throw away surplus '/'
+		 * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
+		 */
+		while (yaffsfs_IsPathDivider(*restOfPath))
+			restOfPath++;	/* get rid of '/' */
 
 		*name = restOfPath;
 		i = 0;
 
-		while(*restOfPath && *restOfPath != '/')
-		{
-			if (i < YAFFS_MAX_NAME_LENGTH)
-			{
+		while (*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)) {
+			if (i < YAFFS_MAX_NAME_LENGTH) {
 				str[i] = *restOfPath;
-				str[i+1] = '\0';
+				str[i + 1] = '\0';
 				i++;
 			}
 			restOfPath++;
 		}
 
-		if(!*restOfPath)
-		{
-			// got to the end of the string
+		if (!*restOfPath)
+			/* got to the end of the string */
 			return dir;
-		}
-		else
-		{
-			if(strcmp(str,".") == 0)
-			{
-				// Do nothing
-			}
-			else if(strcmp(str,"..") == 0)
-			{
+		else {
+			if (yaffs_strcmp(str, _Y(".")) == 0) {
+				/* Do nothing */
+			} else if (yaffs_strcmp(str, _Y("..")) == 0) {
 				dir = dir->parent;
-			}
-			else
-			{
-				dir = yaffs_FindObjectByName(dir,str);
-
-				while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
-				{
+			} else {
+				dir = yaffs_find_by_name(dir, str);
 
-					dir = yaffsfs_FollowLink(dir,symDepth);
+				dir = yaffsfs_FollowLink(dir, symDepth, loop);
 
-				}
-
-				if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-				{
+				if (dir && dir->variant_type !=
+				    YAFFS_OBJECT_TYPE_DIRECTORY) {
+					if (notDir)
+						*notDir = 1;
 					dir = NULL;
 				}
+
 			}
 		}
 	}
-	// directory did not exist.
+	/* directory did not exist. */
 	return NULL;
 }
 
-static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,const char *path,char **name,int symDepth)
+static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
+					       const YCHAR *path,
+					       YCHAR **name,
+					       int symDepth,
+					       int *notDir, int *loop)
 {
-	return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
+	return yaffsfs_DoFindDirectory(relDir, path, name, symDepth, notDir,
+						loop);
 }
 
-// yaffsfs_FindObject turns a path for an existing object into the object
-//
-static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path,int symDepth)
+/*
+ * yaffsfs_FindObject turns a path for an existing object into the object
+ */
+static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relDir,
+					    const YCHAR *path, int symDepth,
+					    int getEquiv,
+					    struct yaffs_obj **dirOut,
+					    int *notDir, int *loop)
 {
-	yaffs_Object *dir;
-	char *name;
+	struct yaffs_obj *dir;
+	struct yaffs_obj *obj;
+	YCHAR *name;
+
+	dir =
+	    yaffsfs_FindDirectory(relDir, path, &name, symDepth, notDir, loop);
+
+	if (dirOut)
+		*dirOut = dir;
+
+	if (dir && *name)
+		obj = yaffs_find_by_name(dir, name);
+	else
+		obj = dir;
+
+	if (getEquiv)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	return obj;
+}
+
+/*************************************************************************
+ *	Start of yaffsfs visible functions.
+ *************************************************************************/
 
-	dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
+int yaffs_dup(int handle)
+{
+	int newHandleNumber = -1;
+	struct yaffsfs_FileDes *existingFD = NULL;
+	struct yaffsfs_Handle *existingHandle = NULL;
+	struct yaffsfs_Handle *newHandle = NULL;
 
-	if(dir && *name)
-	{
-		return yaffs_FindObjectByName(dir,name);
+	yaffsfs_Lock();
+	existingHandle = yaffsfs_HandleToPointer(handle);
+	existingFD = yaffsfs_HandleToFileDes(handle);
+	if (existingFD)
+		newHandleNumber = yaffsfs_NewHandle(&newHandle);
+	if (newHandle) {
+		newHandle->fdId = existingHandle->fdId;
+		existingFD->handleCount++;
 	}
 
-	return dir;
+	yaffsfs_Unlock();
+
+	if (!existingFD)
+		yaffsfs_SetError(-EBADF);
+	else if (!newHandle)
+		yaffsfs_SetError(-ENOMEM);
+
+	return newHandleNumber;
+
 }
 
+static int yaffsfs_TooManyObjects(struct yaffs_dev *dev)
+{
+	int current_objects = dev->n_obj - dev->n_deleted_files;
 
+	if (dev->param.max_objects && current_objects > dev->param.max_objects)
+		return 1;
+	else
+		return 0;
+}
 
-int yaffs_open(const char *path, int oflag, int mode)
+int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
 {
-	yaffs_Object *obj = NULL;
-	yaffs_Object *dir = NULL;
-	char *name;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	YCHAR *name;
 	int handle = -1;
-	yaffsfs_Handle *h = NULL;
-	int alreadyOpen = 0;
-	int alreadyExclusive = 0;
+	struct yaffsfs_FileDes *fd = NULL;
 	int openDenied = 0;
 	int symDepth = 0;
 	int errorReported = 0;
+	int rwflags = oflag & (O_RDWR | O_RDONLY | O_WRONLY);
+	u8 shareRead = (sharing & YAFFS_SHARE_READ) ? 1 : 0;
+	u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
+	u8 sharedReadAllowed;
+	u8 sharedWriteAllowed;
+	u8 alreadyReading;
+	u8 alreadyWriting;
+	u8 readRequested;
+	u8 writeRequested;
+	int notDir = 0;
+	int loop = 0;
 
-	int i;
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	/* O_EXCL only has meaning if O_CREAT is specified */
+	if (!(oflag & O_CREAT))
+		oflag &= ~(O_EXCL);
+
+	/* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
+	if ((oflag & O_CREAT) & (oflag & O_EXCL))
+		oflag &= ~(O_TRUNC);
 
+	/* Todo: Are there any more flag combos to sanitise ? */
 
-	// todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR
+	/* Figure out if reading or writing is requested */
 
+	readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
+	writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
 
 	yaffsfs_Lock();
 
-	handle = yaffsfs_GetHandle();
+	handle = yaffsfs_NewHandleAndFileDes();
 
-	if(handle >= 0)
-	{
+	if (handle < 0) {
+		yaffsfs_SetError(-ENFILE);
+		errorReported = 1;
+	} else {
 
-		h = yaffsfs_GetHandlePointer(handle);
+		fd = yaffsfs_HandleToFileDes(handle);
 
+		/* try to find the exisiting object */
+		obj = yaffsfs_FindObject(NULL, path, 0, 1, NULL, NULL, NULL);
 
-		// try to find the exisiting object
-		obj = yaffsfs_FindObject(NULL,path,0);
+		obj = yaffsfs_FollowLink(obj, symDepth++, &loop);
 
-		if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
-		{
+		if (obj &&
+		    obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
+		    obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+			obj = NULL;
 
-			obj = yaffsfs_FollowLink(obj,symDepth++);
-		}
+		if (obj) {
 
-		if(obj)
-		{
-			// Check if the object is already in use
-			alreadyOpen = alreadyExclusive = 0;
-
-			for(i = 0; i <= YAFFSFS_N_HANDLES; i++)
-			{
-
-				if(i != handle &&
-				   yaffsfs_handle[i].inUse &&
-				    obj == yaffsfs_handle[i].obj)
-				 {
-				 	alreadyOpen = 1;
-					if(yaffsfs_handle[i].exclusive)
-					{
-						alreadyExclusive = 1;
-					}
-				 }
-			}
+			/* The file already exists or it might be a directory */
 
-			if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive)
-			{
+			/* A directory can't be opened as a file */
+			if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
 				openDenied = 1;
+				yaffsfs_SetError(-EISDIR);
+				errorReported = 1;
 			}
 
-			// Open should fail if O_CREAT and O_EXCL are specified
-			if((oflag & O_EXCL) && (oflag & O_CREAT))
-			{
+			/* Open should fail if O_CREAT and O_EXCL are specified
+			 * for a file that exists.
+			 */
+			if (!errorReported &&
+			    (oflag & O_EXCL) && (oflag & O_CREAT)) {
 				openDenied = 1;
 				yaffsfs_SetError(-EEXIST);
 				errorReported = 1;
 			}
 
-			// Check file permissions
-			if( (oflag & (O_RDWR | O_WRONLY)) == 0 &&     // ie O_RDONLY
-			   !(obj->yst_mode & S_IREAD))
-			{
+			/* Check file permissions */
+			if (readRequested && !(obj->yst_mode & S_IREAD))
 				openDenied = 1;
-			}
 
-			if( (oflag & O_RDWR) &&
-			   !(obj->yst_mode & S_IREAD))
-			{
+			if (writeRequested && !(obj->yst_mode & S_IWRITE))
 				openDenied = 1;
-			}
 
-			if( (oflag & (O_RDWR | O_WRONLY)) &&
-			   !(obj->yst_mode & S_IWRITE))
-			{
+			if (!errorReported && writeRequested &&
+			    obj->my_dev->read_only) {
 				openDenied = 1;
+				yaffsfs_SetError(-EROFS);
+				errorReported = 1;
 			}
 
-		}
+			if (openDenied && !errorReported) {
+				yaffsfs_SetError(-EACCES);
+				errorReported = 1;
+			}
+
+			/* Check sharing of an existing object. */
+			if (!openDenied) {
+				struct yaffsfs_FileDes *fdx;
+				int i;
+
+				sharedReadAllowed = 1;
+				sharedWriteAllowed = 1;
+				alreadyReading = 0;
+				alreadyWriting = 0;
+				for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+					fdx = &yaffsfs_fd[i];
+					if (fdx->handleCount > 0 &&
+					    fdx->inodeId >= 0 &&
+					    yaffsfs_inode[fdx->inodeId].iObj
+					    == obj) {
+						if (!fdx->shareRead)
+							sharedReadAllowed = 0;
+						if (!fdx->shareWrite)
+							sharedWriteAllowed = 0;
+						if (fdx->reading)
+							alreadyReading = 1;
+						if (fdx->writing)
+							alreadyWriting = 1;
+					}
+				}
 
-		else if((oflag & O_CREAT))
-		{
-			// Let's see if we can create this file
-			dir = yaffsfs_FindDirectory(NULL,path,&name,0);
-			if(dir)
-			{
-				obj = yaffs_MknodFile(dir,name,mode,0,0);
+				if ((!sharedReadAllowed && readRequested) ||
+				    (!shareRead && alreadyReading) ||
+				    (!sharedWriteAllowed && writeRequested) ||
+				    (!shareWrite && alreadyWriting)) {
+					openDenied = 1;
+					yaffsfs_SetError(-EBUSY);
+					errorReported = 1;
+				}
 			}
-			else
-			{
+
+		}
+
+		/* If we could not open an existing object, then let's see if
+		 * the directory exists. If not, error.
+		 */
+		if (!obj && !errorReported) {
+			dir = yaffsfs_FindDirectory(NULL, path, &name, 0,
+						    &notDir, &loop);
+			if (!dir && notDir) {
 				yaffsfs_SetError(-ENOTDIR);
+				errorReported = 1;
+			} else if (loop) {
+				yaffsfs_SetError(-ELOOP);
+				errorReported = 1;
+			} else if (!dir) {
+				yaffsfs_SetError(-ENOENT);
+				errorReported = 1;
 			}
 		}
 
-		if(obj && !openDenied)
-		{
-			h->obj = obj;
-			h->inUse = 1;
-	    	h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
-			h->append =  (oflag & O_APPEND) ? 1 : 0;
-			h->exclusive = (oflag & O_EXCL) ? 1 : 0;
-			h->position = 0;
-
-			obj->inUse++;
-			if((oflag & O_TRUNC) && !h->readOnly)
-			{
-				//todo truncate
-				yaffs_ResizeFile(obj,0);
+		if (!obj && dir && !errorReported && (oflag & O_CREAT)) {
+			/* Let's see if we can create this file */
+			if (dir->my_dev->read_only) {
+				yaffsfs_SetError(-EROFS);
+				errorReported = 1;
+			} else if (yaffsfs_TooManyObjects(dir->my_dev)) {
+				yaffsfs_SetError(-ENFILE);
+				errorReported = 1;
+			} else
+				obj = yaffs_create_file(dir, name, mode, 0, 0);
+
+			if (!obj && !errorReported) {
+				yaffsfs_SetError(-ENOSPC);
+				errorReported = 1;
 			}
+		}
 
+		if (!obj && dir && !errorReported && !(oflag & O_CREAT)) {
+			yaffsfs_SetError(-ENOENT);
+			errorReported = 1;
 		}
-		else
-		{
-			yaffsfs_PutHandle(handle);
-			if(!errorReported)
-			{
-				yaffsfs_SetError(-EACCESS);
-				errorReported = 1;
+
+		if (obj && !openDenied) {
+			int inodeId = yaffsfs_GetInodeIdForObject(obj);
+
+			if (inodeId < 0) {
+				/*
+				 * Todo: Fix any problem if inodes run out,
+				 * That can't happen if the number of inode
+				 * items >= number of handles.
+				 */
 			}
+
+			fd->inodeId = inodeId;
+			fd->reading = readRequested;
+			fd->writing = writeRequested;
+			fd->append = (oflag & O_APPEND) ? 1 : 0;
+			fd->position = 0;
+			fd->shareRead = shareRead;
+			fd->shareWrite = shareWrite;
+
+			/* Hook inode to object */
+			obj->my_inode = (void *)&yaffsfs_inode[inodeId];
+
+			if ((oflag & O_TRUNC) && fd->writing)
+				yaffs_resize_file(obj, 0);
+		} else {
+			yaffsfs_PutHandle(handle);
+			if (!errorReported)
+				yaffsfs_SetError(0);	/* Problem */
 			handle = -1;
 		}
-
 	}
 
 	yaffsfs_Unlock();
@@ -484,32 +994,68 @@ int yaffs_open(const char *path, int oflag, int mode)
 	return handle;
 }
 
-int yaffs_close(int fd)
+int yaffs_open(const YCHAR *path, int oflag, int mode)
 {
-	yaffsfs_Handle *h = NULL;
-	int retVal = 0;
+	return yaffs_open_sharing(path, oflag, mode,
+				  YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
+}
+
+int yaffs_Dofsync(int handle, int datasync)
+{
+	int retVal = -1;
+	struct yaffs_obj *obj;
 
 	yaffsfs_Lock();
 
-	h = yaffsfs_GetHandlePointer(fd);
+	obj = yaffsfs_HandleToObject(handle);
 
-	if(h && h->inUse)
-	{
-		// clean up
-		yaffs_FlushFile(h->obj,1);
-		h->obj->inUse--;
-		if(h->obj->inUse <= 0 && h->obj->unlinked)
-		{
-			yaffs_DeleteFile(h->obj);
-		}
-		yaffsfs_PutHandle(fd);
+	if (!obj)
+		yaffsfs_SetError(-EBADF);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else {
+		yaffs_flush_file(obj, 1, datasync);
 		retVal = 0;
 	}
-	else
-	{
-		// bad handle
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+int yaffs_fsync(int handle)
+{
+	return yaffs_Dofsync(handle, 0);
+}
+
+int yaffs_flush(int handle)
+{
+	return yaffs_fsync(handle);
+}
+
+int yaffs_fdatasync(int handle)
+{
+	return yaffs_Dofsync(handle, 1);
+}
+
+int yaffs_close(int handle)
+{
+	struct yaffsfs_Handle *h = NULL;
+	struct yaffs_obj *obj = NULL;
+	int retVal = -1;
+
+	yaffsfs_Lock();
+
+	h = yaffsfs_HandleToPointer(handle);
+	obj = yaffsfs_HandleToObject(handle);
+
+	if (!h || !obj)
 		yaffsfs_SetError(-EBADF);
-		retVal = -1;
+	else {
+		/* clean up */
+		yaffs_flush_file(obj, 1, 0);
+		yaffsfs_PutHandle(handle);
+		retVal = 0;
 	}
 
 	yaffsfs_Unlock();
@@ -517,378 +1063,774 @@ int yaffs_close(int fd)
 	return retVal;
 }
 
-int yaffs_read(int fd, void *buf, unsigned int nbyte)
+int yaffsfs_do_read(int handle, void *vbuf, unsigned int nbyte,
+		    int isPread, loff_t offset)
 {
-	yaffsfs_Handle *h = NULL;
-	yaffs_Object *obj = NULL;
-	int pos = 0;
-	int nRead = -1;
-	int maxRead;
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
+	loff_t pos = 0;
+	loff_t startPos = 0;
+	loff_t endPos = 0;
+	int nRead = 0;
+	int nToRead = 0;
+	int totalRead = 0;
+	loff_t maxRead;
+	u8 *buf = (u8 *) vbuf;
+
+	if (!vbuf) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
 	yaffsfs_Lock();
-	h = yaffsfs_GetHandlePointer(fd);
-	obj = yaffsfs_GetHandleObject(fd);
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
 
-	if(!h || !obj)
-	{
-		// bad handle
+	if (!fd || !obj) {
+		/* bad handle */
 		yaffsfs_SetError(-EBADF);
-	}
-	else if( h && obj)
-	{
-		pos=  h->position;
-		if(yaffs_GetObjectFileLength(obj) > pos)
-		{
-			maxRead = yaffs_GetObjectFileLength(obj) - pos;
-		}
+		totalRead = -1;
+	} else if (!fd->reading) {
+		/* Not a reading handle */
+		yaffsfs_SetError(-EINVAL);
+		totalRead = -1;
+	} else if (nbyte > YAFFS_MAX_FILE_SIZE) {
+		yaffsfs_SetError(-EINVAL);
+		totalRead = -1;
+	} else {
+		if (isPread)
+			startPos = offset;
+		else
+			startPos = fd->position;
+
+		pos = startPos;
+
+		if (yaffs_get_obj_length(obj) > pos)
+			maxRead = yaffs_get_obj_length(obj) - pos;
 		else
-		{
 			maxRead = 0;
-		}
 
-		if(nbyte > maxRead)
-		{
+		if (nbyte > maxRead)
 			nbyte = maxRead;
+
+		yaffsfs_GetHandle(handle);
+
+		endPos = pos + nbyte;
+
+		if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
+		    nbyte > YAFFS_MAX_FILE_SIZE ||
+		    endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE) {
+			totalRead = -1;
+			nbyte = 0;
 		}
 
+		while (nbyte > 0) {
+			nToRead = YAFFSFS_RW_SIZE -
+			    (pos & (YAFFSFS_RW_SIZE - 1));
+			if (nToRead > nbyte)
+				nToRead = nbyte;
+
+			/* Tricky bit...
+			 * Need to reverify object in case the device was
+			 * unmounted in another thread.
+			 */
+			obj = yaffsfs_HandleToObject(handle);
+			if (!obj)
+				nRead = 0;
+			else
+				nRead = yaffs_file_rd(obj, buf, pos, nToRead);
 
-		if(nbyte > 0)
-		{
-			nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
-			if(nRead >= 0)
-			{
-				h->position = pos + nRead;
+			if (nRead > 0) {
+				totalRead += nRead;
+				pos += nRead;
+				buf += nRead;
 			}
+
+			if (nRead == nToRead)
+				nbyte -= nRead;
 			else
-			{
-				//todo error
+				nbyte = 0;	/* no more to read */
+
+			if (nbyte > 0) {
+				yaffsfs_Unlock();
+				yaffsfs_Lock();
 			}
+
 		}
-		else
-		{
-			nRead = 0;
+
+		yaffsfs_PutHandle(handle);
+
+		if (!isPread) {
+			if (totalRead >= 0)
+				fd->position = startPos + totalRead;
+			else
+				yaffsfs_SetError(-EINVAL);
 		}
 
 	}
 
 	yaffsfs_Unlock();
 
+	return (totalRead >= 0) ? totalRead : -1;
 
-	return (nRead >= 0) ? nRead : -1;
+}
 
+int yaffs_read(int handle, void *buf, unsigned int nbyte)
+{
+	return yaffsfs_do_read(handle, buf, nbyte, 0, 0);
 }
 
-int yaffs_write(int fd, const void *buf, unsigned int nbyte)
+int yaffs_pread(int handle, void *buf, unsigned int nbyte, loff_t offset)
 {
-	yaffsfs_Handle *h = NULL;
-	yaffs_Object *obj = NULL;
-	int pos = 0;
-	int nWritten = -1;
-	int writeThrough = 0;
+	return yaffsfs_do_read(handle, buf, nbyte, 1, offset);
+}
+
+int yaffsfs_do_write(int handle, const void *vbuf, unsigned int nbyte,
+		     int isPwrite, loff_t offset)
+{
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
+	loff_t pos = 0;
+	loff_t startPos = 0;
+	loff_t endPos;
+	int nWritten = 0;
+	int totalWritten = 0;
+	int write_trhrough = 0;
+	int nToWrite = 0;
+	const u8 *buf = (const u8 *)vbuf;
+
+	if (!vbuf) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
 	yaffsfs_Lock();
-	h = yaffsfs_GetHandlePointer(fd);
-	obj = yaffsfs_GetHandleObject(fd);
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
 
-	if(!h || !obj)
-	{
-		// bad handle
+	if (!fd || !obj) {
+		/* bad handle */
 		yaffsfs_SetError(-EBADF);
-	}
-	else if( h && obj && h->readOnly)
-	{
-		// todo error
-	}
-	else if( h && obj)
-	{
-		if(h->append)
-		{
-			pos =  yaffs_GetObjectFileLength(obj);
-		}
+		totalWritten = -1;
+	} else if (!fd->writing) {
+		yaffsfs_SetError(-EINVAL);
+		totalWritten = -1;
+	} else if (obj->my_dev->read_only) {
+		yaffsfs_SetError(-EROFS);
+		totalWritten = -1;
+	} else {
+		if (fd->append)
+			startPos = yaffs_get_obj_length(obj);
+		else if (isPwrite)
+			startPos = offset;
 		else
-		{
-			pos = h->position;
-		}
+			startPos = fd->position;
 
-		nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte,writeThrough);
+		yaffsfs_GetHandle(handle);
+		pos = startPos;
+		endPos = pos + nbyte;
 
-		if(nWritten >= 0)
-		{
-			h->position = pos + nWritten;
+		if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
+		    nbyte > YAFFS_MAX_FILE_SIZE ||
+		    endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE) {
+			totalWritten = -1;
+			nbyte = 0;
 		}
-		else
-		{
-			//todo error
+
+		while (nbyte > 0) {
+
+			nToWrite = YAFFSFS_RW_SIZE -
+			    (pos & (YAFFSFS_RW_SIZE - 1));
+			if (nToWrite > nbyte)
+				nToWrite = nbyte;
+
+			/* Tricky bit...
+			 * Need to reverify object in case the device was
+			 * remounted or unmounted in another thread.
+			 */
+			obj = yaffsfs_HandleToObject(handle);
+			if (!obj || obj->my_dev->read_only)
+				nWritten = 0;
+			else
+				nWritten =
+				    yaffs_wr_file(obj, buf, pos, nToWrite,
+						  write_trhrough);
+			if (nWritten > 0) {
+				totalWritten += nWritten;
+				pos += nWritten;
+				buf += nWritten;
+			}
+
+			if (nWritten == nToWrite)
+				nbyte -= nToWrite;
+			else
+				nbyte = 0;
+
+			if (nWritten < 1 && totalWritten < 1) {
+				yaffsfs_SetError(-ENOSPC);
+				totalWritten = -1;
+			}
+
+			if (nbyte > 0) {
+				yaffsfs_Unlock();
+				yaffsfs_Lock();
+			}
 		}
 
+		yaffsfs_PutHandle(handle);
+
+		if (!isPwrite) {
+			if (totalWritten > 0)
+				fd->position = startPos + totalWritten;
+			else
+				yaffsfs_SetError(-EINVAL);
+		}
 	}
 
 	yaffsfs_Unlock();
 
+	return (totalWritten >= 0) ? totalWritten : -1;
+}
+
+int yaffs_write(int fd, const void *buf, unsigned int nbyte)
+{
+	return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
+}
+
+int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, loff_t offset)
+{
+	return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
+}
+
+int yaffs_truncate(const YCHAR *path, loff_t new_size)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int result = YAFFS_FAIL;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
 
-	return (nWritten >= 0) ? nWritten : -1;
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+	obj = yaffsfs_FollowLink(obj, 0, &loop);
 
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		yaffsfs_SetError(-EISDIR);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
+		yaffsfs_SetError(-EINVAL);
+	else
+		result = yaffs_resize_file(obj, new_size);
+
+	yaffsfs_Unlock();
+
+	return (result) ? 0 : -1;
 }
 
-int yaffs_truncate(int fd, off_t newSize)
+int yaffs_ftruncate(int handle, loff_t new_size)
 {
-	yaffsfs_Handle *h = NULL;
-	yaffs_Object *obj = NULL;
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
 	int result = 0;
 
 	yaffsfs_Lock();
-	h = yaffsfs_GetHandlePointer(fd);
-	obj = yaffsfs_GetHandleObject(fd);
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
 
-	if(!h || !obj)
-	{
-		// bad handle
+	if (!fd || !obj)
+		/* bad handle */
 		yaffsfs_SetError(-EBADF);
-	}
+	else if (!fd->writing)
+		yaffsfs_SetError(-EINVAL);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
+		yaffsfs_SetError(-EINVAL);
 	else
-	{
-		// resize the file
-		result = yaffs_ResizeFile(obj,newSize);
-	}
+		/* resize the file */
+		result = yaffs_resize_file(obj, new_size);
 	yaffsfs_Unlock();
 
-
 	return (result) ? 0 : -1;
 
 }
 
-off_t yaffs_lseek(int fd, off_t offset, int whence)
+loff_t yaffs_lseek(int handle, loff_t offset, int whence)
 {
-	yaffsfs_Handle *h = NULL;
-	yaffs_Object *obj = NULL;
-	int pos = -1;
-	int fSize = -1;
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
+	loff_t pos = -1;
+	loff_t fSize = -1;
 
 	yaffsfs_Lock();
-	h = yaffsfs_GetHandlePointer(fd);
-	obj = yaffsfs_GetHandleObject(fd);
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
 
-	if(!h || !obj)
-	{
-		// bad handle
+	if (!fd || !obj)
 		yaffsfs_SetError(-EBADF);
-	}
-	else if(whence == SEEK_SET)
-	{
-		if(offset >= 0)
-		{
-			pos = offset;
-		}
-	}
-	else if(whence == SEEK_CUR)
-	{
-		if( (h->position + offset) >= 0)
-		{
-			pos = (h->position + offset);
-		}
-	}
-	else if(whence == SEEK_END)
-	{
-		fSize = yaffs_GetObjectFileLength(obj);
-		if(fSize >= 0 && (fSize + offset) >= 0)
-		{
-			pos = fSize + offset;
+	else if (offset > YAFFS_MAX_FILE_SIZE)
+		yaffsfs_SetError(-EINVAL);
+	else {
+		if (whence == SEEK_SET) {
+			if (offset >= 0)
+				pos = offset;
+		} else if (whence == SEEK_CUR) {
+			if ((fd->position + offset) >= 0)
+				pos = (fd->position + offset);
+		} else if (whence == SEEK_END) {
+			fSize = yaffs_get_obj_length(obj);
+			if (fSize >= 0 && (fSize + offset) >= 0)
+				pos = fSize + offset;
 		}
-	}
 
-	if(pos >= 0)
-	{
-		h->position = pos;
-	}
-	else
-	{
-		// todo error
+		if (pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
+			fd->position = pos;
+		else {
+			yaffsfs_SetError(-EINVAL);
+			pos = -1;
+		}
 	}
 
-
 	yaffsfs_Unlock();
 
 	return pos;
 }
 
-
-int yaffsfs_DoUnlink(const char *path,int isDirectory)
+int yaffsfs_DoUnlink(const YCHAR *path, int isDirectory)
 {
-	yaffs_Object *dir = NULL;
-	yaffs_Object *obj = NULL;
-	char *name;
+	struct yaffs_obj *dir = NULL;
+	struct yaffs_obj *obj = NULL;
+	YCHAR *name;
 	int result = YAFFS_FAIL;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
 
 	yaffsfs_Lock();
 
-	obj = yaffsfs_FindObject(NULL,path,0);
-	dir = yaffsfs_FindDirectory(NULL,path,&name,0);
-	if(!dir)
-	{
+	obj = yaffsfs_FindObject(NULL, path, 0, 0, NULL, NULL, NULL);
+	dir = yaffsfs_FindDirectory(NULL, path, &name, 0, &notDir, &loop);
+
+	if (!dir && notDir)
 		yaffsfs_SetError(-ENOTDIR);
-	}
-	else if(!obj)
-	{
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir)
 		yaffsfs_SetError(-ENOENT);
-	}
-	else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
-	{
+	else if (yaffs_strncmp(name, _Y("."), 2) == 0)
+		yaffsfs_SetError(-EINVAL);
+	else if (!obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (!isDirectory &&
+		 obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
 		yaffsfs_SetError(-EISDIR);
-	}
-	else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-	{
+	else if (isDirectory &&
+		 obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
 		yaffsfs_SetError(-ENOTDIR);
-	}
-	else
-	{
-		result = yaffs_Unlink(dir,name);
+	else if (isDirectory && obj == obj->my_dev->root_dir)
+		yaffsfs_SetError(-EBUSY);	/* Can't rmdir a root */
+	else {
+		result = yaffs_unlinker(dir, name);
 
-		if(result == YAFFS_FAIL && isDirectory)
-		{
+		if (result == YAFFS_FAIL && isDirectory)
 			yaffsfs_SetError(-ENOTEMPTY);
-		}
 	}
 
 	yaffsfs_Unlock();
 
-	// todo error
-
 	return (result == YAFFS_FAIL) ? -1 : 0;
 }
-int yaffs_rmdir(const char *path)
-{
-	return yaffsfs_DoUnlink(path,1);
-}
 
-int yaffs_unlink(const char *path)
+int yaffs_unlink(const YCHAR *path)
 {
-	return yaffsfs_DoUnlink(path,0);
+	return yaffsfs_DoUnlink(path, 0);
 }
 
-int yaffs_rename(const char *oldPath, const char *newPath)
+int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
 {
-	yaffs_Object *olddir = NULL;
-	yaffs_Object *newdir = NULL;
-	yaffs_Object *obj = NULL;
-	char *oldname;
-	char *newname;
-	int result= YAFFS_FAIL;
-	int renameAllowed = 1;
+	struct yaffs_obj *olddir = NULL;
+	struct yaffs_obj *newdir = NULL;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *newobj = NULL;
+	YCHAR *oldname;
+	YCHAR *newname;
+	int result = YAFFS_FAIL;
+	int rename_allowed = 1;
+	int notOldDir = 0;
+	int notNewDir = 0;
+	int oldLoop = 0;
+	int newLoop = 0;
 
-	yaffsfs_Lock();
+	YCHAR *alt_newpath = NULL;
 
-	olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
-	newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
-	obj = yaffsfs_FindObject(NULL,oldPath,0);
+	if (!oldPath || !newPath) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
-	if(!olddir || !newdir || !obj)
-	{
-		// bad file
-		yaffsfs_SetError(-EBADF);
-		renameAllowed = 0;
+	if (yaffsfs_CheckPath(oldPath) < 0 || yaffsfs_CheckPath(newPath) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
 	}
-	else if(olddir->myDev != newdir->myDev)
-	{
-		// oops must be on same device
-		// todo error
-		yaffsfs_SetError(-EXDEV);
-		renameAllowed = 0;
+
+	if (yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0) {
+		yaffsfs_SetError(-ENOMEM);
+		return -1;
 	}
-	else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
-	{
-		// It is a directory, check that it is not being renamed to
-		// being its own decendent.
-		// Do this by tracing from the new directory back to the root, checking for obj
+	if (alt_newpath)
+		newPath = alt_newpath;
 
-		yaffs_Object *xx = newdir;
+	yaffsfs_Lock();
 
-		while( renameAllowed && xx)
-		{
-			if(xx == obj)
-			{
-				renameAllowed = 0;
-			}
+	olddir = yaffsfs_FindDirectory(NULL, oldPath, &oldname, 0,
+				       &notOldDir, &oldLoop);
+	newdir = yaffsfs_FindDirectory(NULL, newPath, &newname, 0,
+				       &notNewDir, &newLoop);
+	obj = yaffsfs_FindObject(NULL, oldPath, 0, 0, NULL, NULL, NULL);
+	newobj = yaffsfs_FindObject(NULL, newPath, 0, 0, NULL, NULL, NULL);
+
+	/* If the object being renamed is a directory and the
+	 * path ended with a "/" then the olddir == obj.
+	 * We pass through NULL for the old name to tell the lower layers
+	 * to use olddir as the object.
+	 */
+
+	if (olddir == obj)
+		oldname = NULL;
+
+	if ((!olddir && notOldDir) || (!newdir && notNewDir)) {
+		yaffsfs_SetError(-ENOTDIR);
+		rename_allowed = 0;
+	} else if (oldLoop || newLoop) {
+		yaffsfs_SetError(-ELOOP);
+		rename_allowed = 0;
+	} else if (olddir && oldname &&
+			yaffs_strncmp(oldname, _Y("."), 2) == 0) {
+		yaffsfs_SetError(-EINVAL);
+		rename_allowed = 0;
+	} else if (!olddir || !newdir || !obj) {
+		yaffsfs_SetError(-ENOENT);
+		rename_allowed = 0;
+	} else if (obj->my_dev->read_only) {
+		yaffsfs_SetError(-EROFS);
+		rename_allowed = 0;
+	} else if (yaffs_is_non_empty_dir(newobj)) {
+		yaffsfs_SetError(-ENOTEMPTY);
+		rename_allowed = 0;
+	} else if (olddir->my_dev != newdir->my_dev) {
+		/* Rename must be on same device */
+		yaffsfs_SetError(-EXDEV);
+		rename_allowed = 0;
+	} else if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+		/*
+		 * It is a directory, check that it is not being renamed to
+		 * being its own decendent.
+		 * Do this by tracing from the new directory back to the root,
+		 * checking for obj
+		 */
+
+		struct yaffs_obj *xx = newdir;
+
+		while (rename_allowed && xx) {
+			if (xx == obj)
+				rename_allowed = 0;
 			xx = xx->parent;
 		}
-		if(!renameAllowed) yaffsfs_SetError(-EACCESS);
+		if (!rename_allowed)
+			yaffsfs_SetError(-EINVAL);
 	}
 
-	if(renameAllowed)
-	{
-		result = yaffs_RenameObject(olddir,oldname,newdir,newname);
-	}
+	if (rename_allowed)
+		result = yaffs_rename_obj(olddir, oldname, newdir, newname);
 
 	yaffsfs_Unlock();
 
+	kfree(alt_newpath);
+
 	return (result == YAFFS_FAIL) ? -1 : 0;
 }
 
-
-static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
+static int yaffsfs_DoStat(struct yaffs_obj *obj, struct yaffs_stat *buf)
 {
 	int retVal = -1;
 
-	if(obj)
-	{
-		obj = yaffs_GetEquivalentObject(obj);
-	}
+	obj = yaffs_get_equivalent_obj(obj);
 
-	if(obj && buf)
-	{
-    	buf->st_dev = (int)obj->myDev->genericDevice;
-    	buf->st_ino = obj->objectId;
-    	buf->st_mode = obj->yst_mode & ~S_IFMT; // clear out file type bits
+	if (obj && buf) {
+		buf->st_dev = (int)obj->my_dev->os_context;
+		buf->st_ino = obj->obj_id;
+		buf->st_mode = obj->yst_mode & ~S_IFMT;
 
-		if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
-		{
+		if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
 			buf->st_mode |= S_IFDIR;
-		}
-		else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
-		{
+		else if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
 			buf->st_mode |= S_IFLNK;
-		}
-		else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-		{
+		else if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
 			buf->st_mode |= S_IFREG;
-		}
 
-    	buf->st_nlink = yaffs_GetObjectLinkCount(obj);
-    	buf->st_uid = 0;
-    	buf->st_gid = 0;;
-    	buf->st_rdev = obj->yst_rdev;
-    	buf->st_size = yaffs_GetObjectFileLength(obj);
-		buf->st_blksize = obj->myDev->nDataBytesPerChunk;
-    	buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
-    	buf->yst_atime = obj->yst_atime;
-    	buf->yst_ctime = obj->yst_ctime;
-    	buf->yst_mtime = obj->yst_mtime;
+		buf->st_nlink = yaffs_get_obj_link_count(obj);
+		buf->st_uid = 0;
+		buf->st_gid = 0;
+		buf->st_rdev = obj->yst_rdev;
+		buf->st_size = yaffs_get_obj_length(obj);
+		buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
+		buf->st_blocks = (buf->st_size + buf->st_blksize - 1) /
+		    buf->st_blksize;
+#if CONFIG_YAFFS_WINCE
+		buf->yst_wince_atime[0] = obj->win_atime[0];
+		buf->yst_wince_atime[1] = obj->win_atime[1];
+		buf->yst_wince_ctime[0] = obj->win_ctime[0];
+		buf->yst_wince_ctime[1] = obj->win_ctime[1];
+		buf->yst_wince_mtime[0] = obj->win_mtime[0];
+		buf->yst_wince_mtime[1] = obj->win_mtime[1];
+#else
+		buf->yst_atime = obj->yst_atime;
+		buf->yst_ctime = obj->yst_ctime;
+		buf->yst_mtime = obj->yst_mtime;
+#endif
 		retVal = 0;
 	}
 	return retVal;
 }
 
-static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
+static int yaffsfs_DoStatOrLStat(const YCHAR *path,
+				 struct yaffs_stat *buf, int doLStat)
 {
-	yaffs_Object *obj;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!path || !buf) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+
+	if (!doLStat && obj)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else
+		retVal = yaffsfs_DoStat(obj, buf);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat(path, buf, 0);
+}
+
+int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat(path, buf, 1);
+}
+
+int yaffs_fstat(int fd, struct yaffs_stat *buf)
+{
+	struct yaffs_obj *obj;
 
 	int retVal = -1;
 
+	if (!buf) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
 	yaffsfs_Lock();
-	obj = yaffsfs_FindObject(NULL,path,0);
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj)
+		retVal = yaffsfs_DoStat(obj, buf);
+	else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffsfs_DoUtime(struct yaffs_obj *obj,
+			   const struct yaffs_utimbuf *buf)
+{
+	int retVal = -1;
+	int result;
+
+	struct yaffs_utimbuf local;
+
+	obj = yaffs_get_equivalent_obj(obj);
+
+	if (obj && obj->my_dev->read_only) {
+		yaffsfs_SetError(-EROFS);
+		return -1;
+	}
+
+	if (!buf) {
+		local.actime = Y_CURRENT_TIME;
+		local.modtime = local.actime;
+		buf = &local;
+	}
 
-	if(!doLStat && obj)
-	{
-		obj = yaffsfs_FollowLink(obj,0);
+	if (obj) {
+		obj->yst_atime = buf->actime;
+		obj->yst_mtime = buf->modtime;
+		obj->dirty = 1;
+		result = yaffs_flush_file(obj, 0, 0);
+		retVal = result == YAFFS_OK ? 0 : -1;
+	}
+
+	return retVal;
+}
+
+int yaffs_utime(const YCHAR *path, const struct yaffs_utimbuf *buf)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
 	}
 
-	if(obj)
-	{
-		retVal = yaffsfs_DoStat(obj,buf);
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
 	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
 	else
-	{
-		// todo error not found
+		retVal = yaffsfs_DoUtime(obj, buf);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_futime(int fd, const struct yaffs_utimbuf *buf)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj)
+		retVal = yaffsfs_DoUtime(obj, buf);
+	else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+#ifndef CONFIG_YAFFS_WINCE
+/* xattrib functions */
+
+static int yaffs_do_setxattr(const YCHAR *path, const char *name,
+			     const void *data, int size, int flags, int follow)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_obj *dir;
+	int notDir = 0;
+	int loop = 0;
+
+	int retVal = -1;
+
+	if (!path || !name || !data) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
 		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_set_xattrib(obj, name, data, size, flags);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
 	}
 
 	yaffsfs_Unlock();
@@ -897,33 +1839,41 @@ static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int do
 
 }
 
-int yaffs_stat(const char *path, struct yaffs_stat *buf)
+int yaffs_setxattr(const YCHAR *path, const char *name,
+		   const void *data, int size, int flags)
 {
-	return yaffsfs_DoStatOrLStat(path,buf,0);
+	return yaffs_do_setxattr(path, name, data, size, flags, 1);
 }
 
-int yaffs_lstat(const char *path, struct yaffs_stat *buf)
+int yaffs_lsetxattr(const YCHAR *path, const char *name,
+		    const void *data, int size, int flags)
 {
-	return yaffsfs_DoStatOrLStat(path,buf,1);
+	return yaffs_do_setxattr(path, name, data, size, flags, 0);
 }
 
-int yaffs_fstat(int fd, struct yaffs_stat *buf)
+int yaffs_fsetxattr(int fd, const char *name,
+		    const void *data, int size, int flags)
 {
-	yaffs_Object *obj;
+	struct yaffs_obj *obj;
 
 	int retVal = -1;
 
+	if (!name || !data) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
 	yaffsfs_Lock();
-	obj = yaffsfs_GetHandleObject(fd);
+	obj = yaffsfs_HandleToObject(fd);
 
-	if(obj)
-	{
-		retVal = yaffsfs_DoStat(obj,buf);
-	}
-	else
-	{
-		// bad handle
+	if (!obj)
 		yaffsfs_SetError(-EBADF);
+	else {
+		retVal = yaffs_set_xattrib(obj, name, data, size, flags);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
 	}
 
 	yaffsfs_Unlock();
@@ -931,43 +1881,128 @@ int yaffs_fstat(int fd, struct yaffs_stat *buf)
 	return retVal;
 }
 
-static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
+static int yaffs_do_getxattr(const YCHAR *path, const char *name,
+			     void *data, int size, int follow)
 {
-	int result = YAFFS_FAIL;
+	struct yaffs_obj *obj;
+	struct yaffs_obj *dir;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
 
-	if(obj)
-	{
-		obj = yaffs_GetEquivalentObject(obj);
+	if (!path || !name || !data) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
 	}
 
-	if(obj)
-	{
-		obj->yst_mode = mode;
-		obj->dirty = 1;
-		result = yaffs_FlushFile(obj,0);
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
 	}
 
-	return result == YAFFS_OK ? 0 : -1;
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_get_xattrib(obj, name, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	}
+	yaffsfs_Unlock();
+
+	return retVal;
+
 }
 
+int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
+{
+	return yaffs_do_getxattr(path, name, data, size, 1);
+}
 
-int yaffs_chmod(const char *path, mode_t mode)
+int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
 {
-	yaffs_Object *obj;
+	return yaffs_do_getxattr(path, name, data, size, 0);
+}
+
+int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
+{
+	struct yaffs_obj *obj;
 
 	int retVal = -1;
 
+	if (!name || !data) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
 	yaffsfs_Lock();
-	obj = yaffsfs_FindObject(NULL,path,0);
+	obj = yaffsfs_HandleToObject(fd);
 
-	if(obj)
-	{
-		retVal = yaffsfs_DoChMod(obj,mode);
+	if (obj) {
+		retVal = yaffs_get_xattrib(obj, name, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	} else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffs_do_listxattr(const YCHAR *path, char *data,
+			      int size, int follow)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!path || !data) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
 	}
-	else
-	{
-		// todo error not found
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
 		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_list_xattrib(obj, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
 	}
 
 	yaffsfs_Unlock();
@@ -976,317 +2011,906 @@ int yaffs_chmod(const char *path, mode_t mode)
 
 }
 
+int yaffs_listxattr(const YCHAR *path, char *data, int size)
+{
+	return yaffs_do_listxattr(path, data, size, 1);
+}
 
-int yaffs_fchmod(int fd, mode_t mode)
+int yaffs_llistxattr(const YCHAR *path, char *data, int size)
 {
-	yaffs_Object *obj;
+	return yaffs_do_listxattr(path, data, size, 0);
+}
+
+int yaffs_flistxattr(int fd, char *data, int size)
+{
+	struct yaffs_obj *obj;
 
 	int retVal = -1;
 
+	if (!data) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
 	yaffsfs_Lock();
-	obj = yaffsfs_GetHandleObject(fd);
+	obj = yaffsfs_HandleToObject(fd);
 
-	if(obj)
-	{
-		retVal = yaffsfs_DoChMod(obj,mode);
-	}
-	else
-	{
-		// bad handle
+	if (obj) {
+		retVal = yaffs_list_xattrib(obj, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	} else
+		/* bad handle */
 		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffs_do_removexattr(const YCHAR *path, const char *name,
+				int follow)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int notDir = 0;
+	int loop = 0;
+	int retVal = -1;
+
+	if (!path || !name) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_remove_xattrib(obj, name);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_removexattr(const YCHAR *path, const char *name)
+{
+	return yaffs_do_removexattr(path, name, 1);
+}
+
+int yaffs_lremovexattr(const YCHAR *path, const char *name)
+{
+	return yaffs_do_removexattr(path, name, 0);
+}
+
+int yaffs_fremovexattr(int fd, const char *name)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	if (!name) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
 	}
 
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
+		retVal = yaffs_remove_xattrib(obj, name);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	} else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
 	yaffsfs_Unlock();
 
 	return retVal;
 }
+#endif
+
+#ifdef CONFIG_YAFFS_WINCE
+int yaffs_get_wince_times(int fd, unsigned *wctime,
+			  unsigned *watime, unsigned *wmtime)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
 
+		if (wctime) {
+			wctime[0] = obj->win_ctime[0];
+			wctime[1] = obj->win_ctime[1];
+		}
+		if (watime) {
+			watime[0] = obj->win_atime[0];
+			watime[1] = obj->win_atime[1];
+		}
+		if (wmtime) {
+			wmtime[0] = obj->win_mtime[0];
+			wmtime[1] = obj->win_mtime[1];
+		}
+
+		retVal = 0;
+	} else
+		/*  bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
 
-int yaffs_mkdir(const char *path, mode_t mode)
+	return retVal;
+}
+
+int yaffs_set_wince_times(int fd,
+			  const unsigned *wctime,
+			  const unsigned *watime, const unsigned *wmtime)
 {
-	yaffs_Object *parent = NULL;
-	yaffs_Object *dir = NULL;
-	char *name;
-	int retVal= -1;
+	struct yaffs_obj *obj;
+	int result;
+	int retVal = -1;
 
 	yaffsfs_Lock();
-	parent = yaffsfs_FindDirectory(NULL,path,&name,0);
-	if(parent)
-		dir = yaffs_MknodDirectory(parent,name,mode,0,0);
-	if(dir)
-	{
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
+
+		if (wctime) {
+			obj->win_ctime[0] = wctime[0];
+			obj->win_ctime[1] = wctime[1];
+		}
+		if (watime) {
+			obj->win_atime[0] = watime[0];
+			obj->win_atime[1] = watime[1];
+		}
+		if (wmtime) {
+			obj->win_mtime[0] = wmtime[0];
+			obj->win_mtime[1] = wmtime[1];
+		}
+
+		obj->dirty = 1;
+		result = yaffs_flush_file(obj, 0, 0);
 		retVal = 0;
+	} else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+#endif
+
+static int yaffsfs_DoChMod(struct yaffs_obj *obj, mode_t mode)
+{
+	int result = -1;
+
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	if (obj) {
+		obj->yst_mode = mode;
+		obj->dirty = 1;
+		result = yaffs_flush_file(obj, 0, 0);
+	}
+
+	return result == YAFFS_OK ? 0 : -1;
+}
+
+int yaffs_access(const YCHAR *path, int amode)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int notDir = 0;
+	int loop = 0;
+	int retval = -1;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
 	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (amode & ~(R_OK | W_OK | X_OK)) {
+		yaffsfs_SetError(-EINVAL);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+	obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if ((amode & W_OK) && obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else {
+		int access_ok = 1;
+
+		if ((amode & R_OK) && !(obj->yst_mode & S_IREAD))
+			access_ok = 0;
+		if ((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
+			access_ok = 0;
+		if ((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
+			access_ok = 0;
+
+		if (!access_ok)
+			yaffsfs_SetError(-EACCES);
+		else
+			retval = 0;
+	}
+
+	yaffsfs_Unlock();
+
+	return retval;
+
+}
+
+int yaffs_chmod(const YCHAR *path, mode_t mode)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (mode & ~(0777)) {
+		yaffsfs_SetError(-EINVAL);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
+	obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
 	else
-	{
-		yaffsfs_SetError(-ENOSPC); // just assume no space for now
-		retVal = -1;
+		retVal = yaffsfs_DoChMod(obj, mode);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_fchmod(int fd, mode_t mode)
+{
+	struct yaffs_obj *obj;
+	int retVal = -1;
+
+	if (mode & ~(0777)) {
+		yaffsfs_SetError(-EINVAL);
+		return -1;
 	}
 
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (!obj)
+		yaffsfs_SetError(-EBADF);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else
+		retVal = yaffsfs_DoChMod(obj, mode);
+
 	yaffsfs_Unlock();
 
 	return retVal;
 }
 
-int yaffs_mount(const char *path)
+int yaffs_mkdir(const YCHAR *path, mode_t mode)
 {
-	int retVal=-1;
-	int result=YAFFS_FAIL;
-	yaffs_Device *dev=NULL;
-	char *dummy;
+	struct yaffs_obj *parent = NULL;
+	struct yaffs_obj *dir = NULL;
+	YCHAR *name;
+	YCHAR *alt_path = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
 
-	T(YAFFS_TRACE_ALWAYS,("yaffs: Mounting %s\n",path));
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
+		yaffsfs_SetError(-ENOMEM);
+		return -1;
+	}
+	if (alt_path)
+		path = alt_path;
 
 	yaffsfs_Lock();
-	dev = yaffsfs_FindDevice(path,&dummy);
-	if(dev)
-	{
-		if(!dev->isMounted)
-		{
-			result = yaffs_GutsInitialise(dev);
-			if(result == YAFFS_FAIL)
-			{
-				// todo error - mount failed
-				yaffsfs_SetError(-ENOMEM);
+	parent = yaffsfs_FindDirectory(NULL, path, &name, 0, &notDir, &loop);
+	if (!parent && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!parent)
+		yaffsfs_SetError(-ENOENT);
+	else if (yaffsfs_TooManyObjects(parent->my_dev))
+		yaffsfs_SetError(-ENFILE);
+	else if (yaffs_strnlen(name, 5) == 0) {
+		/* Trying to make the root itself */
+		yaffsfs_SetError(-EEXIST);
+	} else if (parent->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else {
+		dir = yaffs_create_dir(parent, name, mode, 0, 0);
+		if (dir)
+			retVal = 0;
+		else if (yaffs_find_by_name(parent, name))
+			yaffsfs_SetError(-EEXIST);	/* name exists */
+		else
+			yaffsfs_SetError(-ENOSPC);	/* assume no space */
+	}
+
+	yaffsfs_Unlock();
+
+	kfree(alt_path);
+
+	return retVal;
+}
+
+int yaffs_rmdir(const YCHAR *path)
+{
+	int result;
+	YCHAR *alt_path;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
+		yaffsfs_SetError(-ENOMEM);
+		return -1;
+	}
+	if (alt_path)
+		path = alt_path;
+	result = yaffsfs_DoUnlink(path, 1);
+
+	kfree(alt_path);
+
+	return result;
+}
+
+void *yaffs_getdev(const YCHAR *path)
+{
+	struct yaffs_dev *dev = NULL;
+	YCHAR *dummy;
+	dev = yaffsfs_FindDevice(path, &dummy);
+	return (void *)dev;
+}
+
+int yaffs_mount_common(const YCHAR *path, int read_only, int skip_checkpt)
+{
+	int retVal = -1;
+	int result = YAFFS_FAIL;
+	struct yaffs_dev *dev = NULL;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffs_trace(YAFFS_TRACE_MOUNT, "yaffs: Mounting %s", path);
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	yaffsfs_InitHandles();
+
+	dev = yaffsfs_FindMountPoint(path);
+	if (dev) {
+		if (!dev->is_mounted) {
+			dev->read_only = read_only ? 1 : 0;
+			if (skip_checkpt) {
+				u8 skip = dev->param.skip_checkpt_rd;
+				dev->param.skip_checkpt_rd = 1;
+				result = yaffs_guts_initialise(dev);
+				dev->param.skip_checkpt_rd = skip;
+			} else {
+				result = yaffs_guts_initialise(dev);
 			}
+
+			if (result == YAFFS_FAIL)
+				yaffsfs_SetError(-ENOMEM);
 			retVal = result ? 0 : -1;
 
-		}
-		else
-		{
-			//todo error - already mounted.
+		} else
 			yaffsfs_SetError(-EBUSY);
-		}
-	}
-	else
-	{
-		// todo error - no device
+	} else
 		yaffsfs_SetError(-ENODEV);
-	}
+
 	yaffsfs_Unlock();
 	return retVal;
 
 }
 
-int yaffs_unmount(const char *path)
+int yaffs_mount2(const YCHAR *path, int readonly)
 {
-	int retVal=-1;
-	yaffs_Device *dev=NULL;
-	char *dummy;
+	return yaffs_mount_common(path, readonly, 0);
+}
+
+int yaffs_mount(const YCHAR *path)
+{
+	return yaffs_mount_common(path, 0, 0);
+}
+
+int yaffs_sync(const YCHAR *path)
+{
+	int retVal = -1;
+	struct yaffs_dev *dev = NULL;
+	YCHAR *dummy;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
 
 	yaffsfs_Lock();
-	dev = yaffsfs_FindDevice(path,&dummy);
-	if(dev)
-	{
-		if(dev->isMounted)
-		{
-			int i;
-			int inUse;
+	dev = yaffsfs_FindDevice(path, &dummy);
+	if (dev) {
+		if (!dev->is_mounted)
+			yaffsfs_SetError(-EINVAL);
+		else if (dev->read_only)
+			yaffsfs_SetError(-EROFS);
+		else {
 
-			yaffs_FlushEntireDeviceCache(dev);
-			yaffs_CheckpointSave(dev);
+			yaffs_flush_whole_cache(dev);
+			yaffs_checkpoint_save(dev);
+			retVal = 0;
 
-			for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
-			{
-				if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
-				{
-					inUse = 1; // the device is in use, can't unmount
-				}
-			}
+		}
+	} else
+		yaffsfs_SetError(-ENODEV);
 
-			if(!inUse)
-			{
-				yaffs_Deinitialise(dev);
+	yaffsfs_Unlock();
+	return retVal;
+}
+
+static int yaffsfs_IsDevBusy(struct yaffs_dev *dev)
+{
+	int i;
+	struct yaffs_obj *obj;
 
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		obj = yaffsfs_HandleToObject(i);
+		if (obj && obj->my_dev == dev)
+			return 1;
+	}
+	return 0;
+}
+
+int yaffs_remount(const YCHAR *path, int force, int read_only)
+{
+	int retVal = -1;
+	struct yaffs_dev *dev = NULL;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	dev = yaffsfs_FindMountPoint(path);
+	if (dev) {
+		if (dev->is_mounted) {
+			yaffs_flush_whole_cache(dev);
+
+			if (force || !yaffsfs_IsDevBusy(dev)) {
+				if (read_only)
+					yaffs_checkpoint_save(dev);
+				dev->read_only = read_only ? 1 : 0;
 				retVal = 0;
-			}
-			else
-			{
-				// todo error can't unmount as files are open
+			} else
 				yaffsfs_SetError(-EBUSY);
-			}
 
-		}
-		else
-		{
-			//todo error - not mounted.
+		} else
 			yaffsfs_SetError(-EINVAL);
 
-		}
-	}
-	else
-	{
-		// todo error - no device
+	} else
 		yaffsfs_SetError(-ENODEV);
-	}
+
 	yaffsfs_Unlock();
 	return retVal;
 
 }
 
-loff_t yaffs_freespace(const char *path)
+int yaffs_unmount2(const YCHAR *path, int force)
 {
-	loff_t retVal=-1;
-	yaffs_Device *dev=NULL;
-	char *dummy;
+	int retVal = -1;
+	struct yaffs_dev *dev = NULL;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
 
 	yaffsfs_Lock();
-	dev = yaffsfs_FindDevice(path,&dummy);
-	if(dev  && dev->isMounted)
-	{
-		retVal = yaffs_GetNumberOfFreeChunks(dev);
-		retVal *= dev->nDataBytesPerChunk;
+	dev = yaffsfs_FindMountPoint(path);
+	if (dev) {
+		if (dev->is_mounted) {
+			int inUse;
+			yaffs_flush_whole_cache(dev);
+			yaffs_checkpoint_save(dev);
+			inUse = yaffsfs_IsDevBusy(dev);
+			if (!inUse || force) {
+				if (inUse)
+					yaffsfs_BreakDeviceHandles(dev);
+				yaffs_deinitialise(dev);
+
+				retVal = 0;
+			} else
+				yaffsfs_SetError(-EBUSY);
+
+		} else
+			yaffsfs_SetError(-EINVAL);
+
+	} else
+		yaffsfs_SetError(-ENODEV);
+
+	yaffsfs_Unlock();
+	return retVal;
+
+}
+
+int yaffs_unmount(const YCHAR *path)
+{
+	return yaffs_unmount2(path, 0);
+}
+
+loff_t yaffs_freespace(const YCHAR *path)
+{
+	loff_t retVal = -1;
+	struct yaffs_dev *dev = NULL;
+	YCHAR *dummy;
 
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
 	}
-	else
-	{
-		yaffsfs_SetError(-EINVAL);
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
 	}
 
+	yaffsfs_Lock();
+	dev = yaffsfs_FindDevice(path, &dummy);
+	if (dev && dev->is_mounted) {
+		retVal = yaffs_get_n_free_chunks(dev);
+		retVal *= dev->data_bytes_per_chunk;
+
+	} else
+		yaffsfs_SetError(-EINVAL);
+
 	yaffsfs_Unlock();
 	return retVal;
 }
 
+loff_t yaffs_totalspace(const YCHAR *path)
+{
+	loff_t retVal = -1;
+	struct yaffs_dev *dev = NULL;
+	YCHAR *dummy;
 
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
-void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
-{
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
 
-	yaffsfs_DeviceConfiguration *cfg;
+	yaffsfs_Lock();
+	dev = yaffsfs_FindDevice(path, &dummy);
+	if (dev && dev->is_mounted) {
+		retVal = (dev->param.end_block - dev->param.start_block + 1) -
+		    dev->param.n_reserved_blocks;
+		retVal *= dev->param.chunks_per_block;
+		retVal *= dev->data_bytes_per_chunk;
+
+	} else
+		yaffsfs_SetError(-EINVAL);
+
+	yaffsfs_Unlock();
+	return retVal;
+}
 
-	yaffsfs_configurationList = cfgList;
+int yaffs_inodecount(const YCHAR *path)
+{
+	loff_t retVal = -1;
+	struct yaffs_dev *dev = NULL;
+	YCHAR *dummy;
 
-	yaffsfs_InitHandles();
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
-	cfg = yaffsfs_configurationList;
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
 
-	while(cfg && cfg->prefix && cfg->dev)
-	{
-		cfg->dev->isMounted = 0;
-		cfg->dev->removeObjectCallback = yaffsfs_RemoveObjectCallback;
-		cfg++;
+	yaffsfs_Lock();
+	dev = yaffsfs_FindDevice(path, &dummy);
+	if (dev && dev->is_mounted) {
+		int n_obj = dev->n_obj;
+		if (n_obj > dev->n_hardlinks)
+			retVal = n_obj - dev->n_hardlinks;
 	}
+
+	if (retVal < 0)
+		yaffsfs_SetError(-EINVAL);
+
+	yaffsfs_Unlock();
+	return retVal;
 }
 
+void yaffs_add_device(struct yaffs_dev *dev)
+{
+	struct list_head *cfg;
+	/* First check that the device is not in the list. */
+
+	list_for_each(cfg, &yaffsfs_deviceList) {
+		if (dev == list_entry(cfg, struct yaffs_dev, dev_list))
+			return;
+	}
+
+	dev->is_mounted = 0;
+	dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
 
-//
-// Directory search stuff.
+	if (!dev->dev_list.next)
+		INIT_LIST_HEAD(&dev->dev_list);
 
-//
-// Directory search context
-//
-// NB this is an opaque structure.
+	list_add(&dev->dev_list, &yaffsfs_deviceList);
+}
+
+void yaffs_remove_device(struct yaffs_dev *dev)
+{
+	list_del_init(&dev->dev_list);
+}
 
+/* Functions to iterate through devices. NB Use with extreme care! */
 
-typedef struct
+static struct list_head *dev_iterator;
+void yaffs_dev_rewind(void)
 {
-	__u32 magic;
-	yaffs_dirent de;		/* directory entry being used by this dsc */
-	char name[NAME_MAX+1];		/* name of directory being searched */
-	yaffs_Object *dirObj;		/* ptr to directory being searched */
-	yaffs_Object *nextReturn;	/* obj to be returned by next readddir */
-	int offset;
-	struct list_head others;
-} yaffsfs_DirectorySearchContext;
+	dev_iterator = yaffsfs_deviceList.next;
+}
+
+struct yaffs_dev *yaffs_next_dev(void)
+{
+	struct yaffs_dev *retval;
 
+	if (!dev_iterator)
+		return NULL;
+	if (dev_iterator == &yaffsfs_deviceList)
+		return NULL;
+
+	retval = list_entry(dev_iterator, struct yaffs_dev, dev_list);
+	dev_iterator = dev_iterator->next;
+	return retval;
+}
 
+/* Directory search stuff. */
 
 static struct list_head search_contexts;
 
-
-static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
+static void yaffsfs_SetDirRewound(struct yaffsfs_DirSearchContxt *dsc)
 {
-	if(dsc &&
-	   dsc->dirObj &&
-	   dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
+	if (dsc &&
+	    dsc->dirObj &&
+	    dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
 
-	   dsc->offset = 0;
+		dsc->offset = 0;
 
-	   if( list_empty(&dsc->dirObj->variant.directoryVariant.children)){
-	   	dsc->nextReturn = NULL;
-	   } else {
-	      	dsc->nextReturn = list_entry(dsc->dirObj->variant.directoryVariant.children.next,
-						yaffs_Object,siblings);
-	   }
+		if (list_empty(&dsc->dirObj->variant.dir_variant.children))
+			dsc->nextReturn = NULL;
+		else
+			dsc->nextReturn =
+			    list_entry(dsc->dirObj->variant.dir_variant.
+				       children.next, struct yaffs_obj,
+				       siblings);
 	} else {
 		/* Hey someone isn't playing nice! */
 	}
 }
 
-static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
+static void yaffsfs_DirAdvance(struct yaffsfs_DirSearchContxt *dsc)
 {
-	if(dsc &&
-	   dsc->dirObj &&
-	   dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
-
-	   if( dsc->nextReturn == NULL ||
-	       list_empty(&dsc->dirObj->variant.directoryVariant.children)){
-	   	dsc->nextReturn = NULL;
-	   } else {
-		   struct list_head *next = dsc->nextReturn->siblings.next;
-
-		   if( next == &dsc->dirObj->variant.directoryVariant.children)
-	   		dsc->nextReturn = NULL; /* end of list */
-	   	   else
-		   	dsc->nextReturn = list_entry(next,yaffs_Object,siblings);
-	   }
+	if (dsc &&
+	    dsc->dirObj &&
+	    dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+
+		if (dsc->nextReturn == NULL ||
+		    list_empty(&dsc->dirObj->variant.dir_variant.children))
+			dsc->nextReturn = NULL;
+		else {
+			struct list_head *next = dsc->nextReturn->siblings.next;
+
+			if (next == &dsc->dirObj->variant.dir_variant.children)
+				dsc->nextReturn = NULL;	/* end of list */
+			else
+				dsc->nextReturn = list_entry(next,
+							     struct yaffs_obj,
+							     siblings);
+		}
 	} else {
 		/* Hey someone isn't playing nice! */
 	}
 }
 
-static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj)
+static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
 {
 
 	struct list_head *i;
-	yaffsfs_DirectorySearchContext *dsc;
+	struct yaffsfs_DirSearchContxt *dsc;
 
 	/* if search contexts not initilised then skip */
-	if(!search_contexts.next)
+	if (!search_contexts.next)
 		return;
 
-	/* Iteratethrough the directory search contexts.
+	/* Iterate through the directory search contexts.
 	 * If any are the one being removed, then advance the dsc to
 	 * the next one to prevent a hanging ptr.
 	 */
-	 list_for_each(i, &search_contexts) {
+	list_for_each(i, &search_contexts) {
 		if (i) {
-			dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
-			if(dsc->nextReturn == obj)
+			dsc = list_entry(i, struct yaffsfs_DirSearchContxt,
+					 others);
+			if (dsc->nextReturn == obj)
 				yaffsfs_DirAdvance(dsc);
 		}
 	}
 
 }
 
-yaffs_DIR *yaffs_opendir(const char *dirname)
+yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
 {
 	yaffs_DIR *dir = NULL;
- 	yaffs_Object *obj = NULL;
-	yaffsfs_DirectorySearchContext *dsc = NULL;
+	struct yaffs_obj *obj = NULL;
+	struct yaffsfs_DirSearchContxt *dsc = NULL;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!dirname) {
+		yaffsfs_SetError(-EFAULT);
+		return NULL;
+	}
+
+	if (yaffsfs_CheckPath(dirname) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return NULL;
+	}
 
 	yaffsfs_Lock();
 
-	obj = yaffsfs_FindObject(NULL,dirname,0);
+	obj = yaffsfs_FindObject(NULL, dirname, 0, 1, NULL, &notDir, &loop);
+
+	if (!obj && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		yaffsfs_SetError(-ENOTDIR);
+	else {
+		int i;
+
+		for (i = 0, dsc = NULL; i < YAFFSFS_N_DSC && !dsc; i++) {
+			if (!yaffsfs_dsc[i].inUse)
+				dsc = &yaffsfs_dsc[i];
+		}
 
-	if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
-	{
+		dir = (yaffs_DIR *) dsc;
 
-		dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
-		dir = (yaffs_DIR *)dsc;
-		if(dsc)
-		{
-			memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
-			dsc->magic = YAFFS_MAGIC;
+		if (dsc) {
+			memset(dsc, 0, sizeof(struct yaffsfs_DirSearchContxt));
+			dsc->inUse = 1;
 			dsc->dirObj = obj;
-			strncpy(dsc->name,dirname,NAME_MAX);
+			yaffs_strncpy(dsc->name, dirname, NAME_MAX);
 			INIT_LIST_HEAD(&dsc->others);
 
-			if(!search_contexts.next)
+			if (!search_contexts.next)
 				INIT_LIST_HEAD(&search_contexts);
 
-			list_add(&dsc->others,&search_contexts);
-			yaffsfs_SetDirRewound(dsc);		}
+			list_add(&dsc->others, &search_contexts);
+			yaffsfs_SetDirRewound(dsc);
+		}
 
 	}
 
@@ -1295,35 +2919,34 @@ yaffs_DIR *yaffs_opendir(const char *dirname)
 	return dir;
 }
 
-struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
+struct yaffs_dirent *yaffs_readdir(yaffs_DIR * dirp)
 {
-	yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
+	struct yaffsfs_DirSearchContxt *dsc;
 	struct yaffs_dirent *retVal = NULL;
 
+	dsc = (struct yaffsfs_DirSearchContxt *) dirp;
 	yaffsfs_Lock();
 
-	if(dsc && dsc->magic == YAFFS_MAGIC){
+	if (dsc && dsc->inUse) {
 		yaffsfs_SetError(0);
-		if(dsc->nextReturn){
-			dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId;
+		if (dsc->nextReturn) {
+			dsc->de.d_ino =
+			    yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id;
 			dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
 			dsc->de.d_off = dsc->offset++;
-			yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
-			if(strlen(dsc->de.d_name) == 0)
-			{
-				// this should not happen!
-				strcpy(dsc->de.d_name,"zz");
+			yaffs_get_obj_name(dsc->nextReturn,
+					   dsc->de.d_name, NAME_MAX);
+			if (yaffs_strnlen(dsc->de.d_name, NAME_MAX + 1) == 0) {
+				/* this should not happen! */
+				yaffs_strcpy(dsc->de.d_name, _Y("zz"));
 			}
 			dsc->de.d_reclen = sizeof(struct yaffs_dirent);
 			retVal = &dsc->de;
 			yaffsfs_DirAdvance(dsc);
 		} else
 			retVal = NULL;
-	}
-	else
-	{
+	} else
 		yaffsfs_SetError(-EBADF);
-	}
 
 	yaffsfs_Unlock();
 
@@ -1331,10 +2954,11 @@ struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
 
 }
 
-
 void yaffs_rewinddir(yaffs_DIR *dirp)
 {
-	yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
+	struct yaffsfs_DirSearchContxt *dsc;
+
+	dsc = (struct yaffsfs_DirSearchContxt *) dirp;
 
 	yaffsfs_Lock();
 
@@ -1343,41 +2967,67 @@ void yaffs_rewinddir(yaffs_DIR *dirp)
 	yaffsfs_Unlock();
 }
 
-
 int yaffs_closedir(yaffs_DIR *dirp)
 {
-	yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
+	struct yaffsfs_DirSearchContxt *dsc;
+
+	dsc = (struct yaffsfs_DirSearchContxt *) dirp;
+
+	if (!dsc) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
 	yaffsfs_Lock();
-	dsc->magic = 0;
-	list_del(&dsc->others); /* unhook from list */
-	YFREE(dsc);
+	dsc->inUse = 0;
+	list_del(&dsc->others);	/* unhook from list */
 	yaffsfs_Unlock();
 	return 0;
 }
 
-// end of directory stuff
-
+/* End of directory stuff */
 
-int yaffs_symlink(const char *oldpath, const char *newpath)
+int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
 {
-	yaffs_Object *parent = NULL;
-	yaffs_Object *obj;
-	char *name;
-	int retVal= -1;
-	int mode = 0; // ignore for now
+	struct yaffs_obj *parent = NULL;
+	struct yaffs_obj *obj;
+	YCHAR *name;
+	int retVal = -1;
+	int mode = 0;		/* ignore for now */
+	int notDir = 0;
+	int loop = 0;
 
-	yaffsfs_Lock();
-	parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
-	obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
-	if(obj)
-	{
-		retVal = 0;
+	if (!oldpath || !newpath) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
 	}
-	else
-	{
-		yaffsfs_SetError(-ENOSPC); // just assume no space for now
-		retVal = -1;
+
+	if (yaffsfs_CheckPath(newpath) < 0 || yaffsfs_CheckPath(oldpath) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	parent = yaffsfs_FindDirectory(NULL, newpath, &name, 0, &notDir, &loop);
+	if (!parent && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!parent || yaffs_strnlen(name, 5) < 1)
+		yaffsfs_SetError(-ENOENT);
+	else if (yaffsfs_TooManyObjects(parent->my_dev))
+		yaffsfs_SetError(-ENFILE);
+	else if (parent->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (parent) {
+		obj = yaffs_create_symlink(parent, name, mode, 0, 0, oldpath);
+		if (obj)
+			retVal = 0;
+		else if (yaffsfs_FindObject
+			 (NULL, newpath, 0, 0, NULL, NULL, NULL))
+			yaffsfs_SetError(-EEXIST);
+		else
+			yaffsfs_SetError(-ENOSPC);
 	}
 
 	yaffsfs_Unlock();
@@ -1386,90 +3036,98 @@ int yaffs_symlink(const char *oldpath, const char *newpath)
 
 }
 
-int yaffs_readlink(const char *path, char *buf, int bufsiz)
+int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
 {
-	yaffs_Object *obj = NULL;
-	int retVal;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
 
+	if (!path || !buf) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
 	yaffsfs_Lock();
 
-	obj = yaffsfs_FindObject(NULL,path,0);
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
 
-	if(!obj)
-	{
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
 		yaffsfs_SetError(-ENOENT);
-		retVal = -1;
-	}
-	else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
-	{
+	else if (obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK)
 		yaffsfs_SetError(-EINVAL);
-		retVal = -1;
-	}
-	else
-	{
-		char *alias = obj->variant.symLinkVariant.alias;
-		memset(buf,0,bufsiz);
-		strncpy(buf,alias,bufsiz - 1);
+	else {
+		YCHAR *alias = obj->variant.symlink_variant.alias;
+		memset(buf, 0, bufsiz);
+		yaffs_strncpy(buf, alias, bufsiz - 1);
 		retVal = 0;
 	}
 	yaffsfs_Unlock();
 	return retVal;
 }
 
-int yaffs_link(const char *oldpath, const char *newpath)
+int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath)
 {
-	// Creates a link called newpath to existing oldpath
-	yaffs_Object *obj = NULL;
-	yaffs_Object *target = NULL;
-	int retVal = 0;
+	/* Creates a link called newpath to existing oldpath */
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *lnk = NULL;
+	struct yaffs_obj *obj_dir = NULL;
+	struct yaffs_obj *lnk_dir = NULL;
+	int retVal = -1;
+	int notDirObj = 0;
+	int notDirLnk = 0;
+	int objLoop = 0;
+	int lnkLoop = 0;
+	YCHAR *newname;
+
+	if (!oldpath || !linkpath) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
+	if (yaffsfs_CheckPath(linkpath) < 0 || yaffsfs_CheckPath(oldpath) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
 
 	yaffsfs_Lock();
 
-	obj = yaffsfs_FindObject(NULL,oldpath,0);
-	target = yaffsfs_FindObject(NULL,newpath,0);
+	obj = yaffsfs_FindObject(NULL, oldpath, 0, 1,
+				 &obj_dir, &notDirObj, &objLoop);
+	lnk = yaffsfs_FindObject(NULL, linkpath, 0, 0, NULL, NULL, NULL);
+	lnk_dir = yaffsfs_FindDirectory(NULL, linkpath, &newname,
+					0, &notDirLnk, &lnkLoop);
 
-	if(!obj)
-	{
+	if ((!obj_dir && notDirObj) || (!lnk_dir && notDirLnk))
+		yaffsfs_SetError(-ENOTDIR);
+	else if (objLoop || lnkLoop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!obj_dir || !lnk_dir || !obj)
 		yaffsfs_SetError(-ENOENT);
-		retVal = -1;
-	}
-	else if(target)
-	{
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (yaffsfs_TooManyObjects(obj->my_dev))
+		yaffsfs_SetError(-ENFILE);
+	else if (lnk)
 		yaffsfs_SetError(-EEXIST);
-		retVal = -1;
-	}
-	else
-	{
-		yaffs_Object *newdir = NULL;
-		yaffs_Object *link = NULL;
-
-		char *newname;
-
-		newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0);
+	else if (lnk_dir->my_dev != obj->my_dev)
+		yaffsfs_SetError(-EXDEV);
+	else {
+		retVal = yaffsfs_CheckNameLength(newname);
 
-		if(!newdir)
-		{
-			yaffsfs_SetError(-ENOTDIR);
-			retVal = -1;
-		}
-		else if(newdir->myDev != obj->myDev)
-		{
-			yaffsfs_SetError(-EXDEV);
-			retVal = -1;
-		}
-		if(newdir && strlen(newname) > 0)
-		{
-			link = yaffs_Link(newdir,newname,obj);
-			if(link)
+		if (retVal == 0) {
+			lnk = yaffs_link_obj(lnk_dir, newname, obj);
+			if (lnk)
 				retVal = 0;
-			else
-			{
+			else {
 				yaffsfs_SetError(-ENOSPC);
 				retVal = -1;
 			}
-
 		}
 	}
 	yaffsfs_Unlock();
@@ -1477,34 +3135,84 @@ int yaffs_link(const char *oldpath, const char *newpath)
 	return retVal;
 }
 
-int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
+int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
+{
+	pathname = pathname;
+	mode = mode;
+	dev = dev;
+
+	yaffsfs_SetError(-EINVAL);
+	return -1;
+}
+
+/*
+ * D E B U G   F U N C T I O N S
+ */
 
-int yaffs_DumpDevStruct(const char *path)
+/*
+ * yaffs_n_handles()
+ * Returns number of handles attached to the object
+ */
+int yaffs_n_handles(const YCHAR *path)
 {
-	char *rest;
+	struct yaffs_obj *obj;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
 
-	yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
 
-	if(obj)
-	{
-		yaffs_Device *dev = obj->myDev;
+	obj = yaffsfs_FindObject(NULL, path, 0, 1, NULL, NULL, NULL);
+
+	if (obj)
+		return yaffsfs_CountHandles(obj);
+	else
+		return -1;
+}
+
+int yaffs_get_error(void)
+{
+	return yaffsfs_GetLastError();
+}
+
+int yaffs_set_error(int error)
+{
+	yaffsfs_SetError(error);
+	return 0;
+}
+
+int yaffs_dump_dev(const YCHAR *path)
+{
+#if 1
+	path = path;
+#else
+	YCHAR *rest;
+
+	struct yaffs_obj *obj = yaffsfs_FindRoot(path, &rest);
+
+	if (obj) {
+		struct yaffs_dev *dev = obj->my_dev;
 
 		printf("\n"
-			   "nPageWrites.......... %d\n"
-			   "nPageReads........... %d\n"
-			   "nBlockErasures....... %d\n"
-			   "nGCCopies............ %d\n"
-			   "garbageCollections... %d\n"
-			   "passiveGarbageColl'ns %d\n"
-			   "\n",
-				dev->nPageWrites,
-				dev->nPageReads,
-				dev->nBlockErasures,
-				dev->nGCCopies,
-				dev->garbageCollections,
-				dev->passiveGarbageCollections
-		);
+		       "n_page_writes.......... %d\n"
+		       "n_page_reads........... %d\n"
+		       "n_erasures....... %d\n"
+		       "n_gc_copies............ %d\n"
+		       "garbageCollections... %d\n"
+		       "passiveGarbageColl'ns %d\n"
+		       "\n",
+		       dev->n_page_writes,
+		       dev->n_page_reads,
+		       dev->n_erasures,
+		       dev->n_gc_copies,
+		       dev->garbageCollections, dev->passiveGarbageCollections);
 
 	}
+#endif
 	return 0;
 }
diff --git a/fs/yaffs2/yaffsfs.h b/fs/yaffs2/yaffsfs.h
index 95e7a91..f2c7666 100644
--- a/fs/yaffs2/yaffsfs.h
+++ b/fs/yaffs2/yaffsfs.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -26,206 +26,184 @@
 #include "yportenv.h"
 
 
-//typedef long off_t;
-//typedef long dev_t;
-//typedef unsigned long mode_t;
-
-
 #ifndef NAME_MAX
 #define NAME_MAX	256
 #endif
 
-#ifndef O_RDONLY
-#define O_RDONLY	00
-#endif
-
-#ifndef O_WRONLY
-#define O_WRONLY	01
-#endif
-
-#ifndef O_RDWR
-#define O_RDWR		02
-#endif
+#define YAFFS_MAX_FILE_SIZE (0x800000000LL - 1)
 
-#ifndef O_CREAT
-#define O_CREAT 	0100
-#endif
 
-#ifndef O_EXCL
-#define O_EXCL		0200
-#endif
-
-#ifndef O_TRUNC
-#define O_TRUNC		01000
-#endif
+struct yaffs_dirent {
+	long d_ino;			/* inode number */
+	off_t d_off;			/* offset to this dirent */
+	unsigned short d_reclen;	/* length of this dirent */
+	YUCHAR d_type;			/* type of this record */
+	YCHAR d_name[NAME_MAX+1];	/* file name (null-terminated) */
+	unsigned d_dont_use;		/* debug: not for public consumption */
+};
 
-#ifndef O_APPEND
-#define O_APPEND	02000
+typedef struct opaque_structure yaffs_DIR;
+
+
+
+struct yaffs_stat {
+	int		st_dev;		/* device */
+	int		st_ino;		/* inode */
+	unsigned	st_mode;	/* protection */
+	int		st_nlink;	/* number of hard links */
+	int		st_uid;		/* user ID of owner */
+	int		st_gid;		/* group ID of owner */
+	unsigned	st_rdev;	/* device type (if inode device) */
+	loff_t		st_size;	/* total size, in bytes */
+	unsigned long	st_blksize;	/* blocksize for filesystem I/O */
+	unsigned long	st_blocks;	/* number of blocks allocated */
+#ifdef CONFIG_YAFFS_WINCE
+	/* Special 64-bit times for WinCE */
+	unsigned long	yst_wince_atime[2];
+	unsigned long	yst_wince_mtime[2];
+	unsigned long	yst_wince_ctime[2];
+#else
+	unsigned long	yst_atime;	/* time of last access */
+	unsigned long	yst_mtime;	/* time of last modification */
+	unsigned long	yst_ctime;	/* time of last change */
 #endif
+};
 
-#ifndef SEEK_SET
-#define SEEK_SET	0
-#endif
 
-#ifndef SEEK_CUR
-#define SEEK_CUR	1
-#endif
+struct yaffs_utimbuf {
+	unsigned long actime;
+	unsigned long modtime;
+};
 
-#ifndef SEEK_END
-#define SEEK_END	2
-#endif
 
-#ifndef EBUSY
-#define EBUSY	16
-#endif
+int yaffs_open(const YCHAR *path, int oflag, int mode) ;
 
-#ifndef ENODEV
-#define ENODEV	19
-#endif
-
-#ifndef EINVAL
-#define EINVAL	22
-#endif
+int yaffs_close(int fd) ;
+int yaffs_fsync(int fd) ;
+int yaffs_fdatasync(int fd) ;
+int yaffs_flush(int fd) ; /* same as yaffs_fsync() */
 
-#ifndef EBADF
-#define EBADF	9
-#endif
+int yaffs_access(const YCHAR *path, int amode);
 
-#ifndef EACCESS
-#define EACCESS	13
-#endif
+int yaffs_dup(int fd);
 
-#ifndef EXDEV
-#define EXDEV	18
-#endif
+int yaffs_read(int fd, void *buf, unsigned int nbyte) ;
+int yaffs_write(int fd, const void *buf, unsigned int nbyte) ;
 
-#ifndef ENOENT
-#define ENOENT	2
-#endif
+int yaffs_pread(int fd, void *buf, unsigned int nbyte, loff_t offset);
+int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, loff_t offset);
 
-#ifndef ENOSPC
-#define ENOSPC	28
-#endif
+loff_t yaffs_lseek(int fd, loff_t offset, int whence) ;
 
-#ifndef ENOTEMPTY
-#define ENOTEMPTY 39
-#endif
+int yaffs_truncate(const YCHAR *path, loff_t new_size);
+int yaffs_ftruncate(int fd, loff_t new_size);
 
-#ifndef ENOMEM
-#define ENOMEM 12
-#endif
+int yaffs_unlink(const YCHAR *path) ;
+int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath) ;
 
-#ifndef EEXIST
-#define EEXIST 17
-#endif
+int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf) ;
+int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf) ;
+int yaffs_fstat(int fd, struct yaffs_stat *buf) ;
 
-#ifndef ENOTDIR
-#define ENOTDIR 20
-#endif
+int yaffs_utime(const YCHAR *path, const struct yaffs_utimbuf *buf);
+int yaffs_futime(int fd, const struct yaffs_utimbuf *buf);
 
-#ifndef EISDIR
-#define EISDIR 21
-#endif
 
+int yaffs_setxattr(const char *path, const char *name,
+			const void *data, int size, int flags);
+int yaffs_lsetxattr(const char *path, const char *name,
+			const void *data, int size, int flags);
+int yaffs_fsetxattr(int fd, const char *name,
+			const void *data, int size, int flags);
 
-// Mode flags
+int yaffs_getxattr(const char *path, const char *name,
+			void *data, int size);
+int yaffs_lgetxattr(const char *path, const char *name,
+			void *data, int size);
+int yaffs_fgetxattr(int fd, const char *name,
+			void *data, int size);
 
-#ifndef S_IFMT
-#define S_IFMT		0170000
-#endif
+int yaffs_removexattr(const char *path, const char *name);
+int yaffs_lremovexattr(const char *path, const char *name);
+int yaffs_fremovexattr(int fd, const char *name);
 
-#ifndef S_IFLNK
-#define S_IFLNK		0120000
-#endif
+int yaffs_listxattr(const char *path, char *list, int size);
+int yaffs_llistxattr(const char *path, char *list, int size);
+int yaffs_flistxattr(int fd, char *list, int size);
 
-#ifndef S_IFDIR
-#define S_IFDIR		0040000
-#endif
 
-#ifndef S_IFREG
-#define S_IFREG		0100000
-#endif
+#ifdef CONFIG_YAFFS_WINCE
 
-#ifndef S_IREAD
-#define S_IREAD		0000400
-#endif
+int yaffs_set_wince_times(int fd,
+			const unsigned *wctime,
+			const unsigned *watime,
+			const unsigned *wmtime);
+int yaffs_get_wince_times(int fd,
+			unsigned *wctime,
+			unsigned *watime,
+			unsigned *wmtime);
 
-#ifndef S_IWRITE
-#define	S_IWRITE	0000200
 #endif
 
+int yaffs_chmod(const YCHAR *path, mode_t mode);
+int yaffs_fchmod(int fd, mode_t mode);
 
+int yaffs_mkdir(const YCHAR *path, mode_t mode) ;
+int yaffs_rmdir(const YCHAR *path) ;
 
+yaffs_DIR *yaffs_opendir(const YCHAR *dirname) ;
+struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp) ;
+void yaffs_rewinddir(yaffs_DIR *dirp) ;
+int yaffs_closedir(yaffs_DIR *dirp) ;
 
-struct yaffs_dirent{
-    long d_ino;                 /* inode number */
-    off_t d_off;                /* offset to this dirent */
-    unsigned short d_reclen;    /* length of this d_name */
-    char d_name [NAME_MAX+1];   /* file name (null-terminated) */
-    unsigned d_dont_use;	/* debug pointer, not for public consumption */
-};
-
-typedef struct yaffs_dirent yaffs_dirent;
-
-
-typedef struct __opaque yaffs_DIR;
-
+int yaffs_mount(const YCHAR *path) ;
+int yaffs_mount2(const YCHAR *path, int read_only);
+int yaffs_mount_common(const YCHAR *path, int read_only, int skip_checkpt);
 
+int yaffs_unmount(const YCHAR *path) ;
+int yaffs_unmount2(const YCHAR *path, int force);
+int yaffs_remount(const YCHAR *path, int force, int read_only);
 
-struct yaffs_stat{
-    int		      st_dev;      /* device */
-    int           st_ino;      /* inode */
-    mode_t        st_mode;     /* protection */
-    int           st_nlink;    /* number of hard links */
-    int           st_uid;      /* user ID of owner */
-    int           st_gid;      /* group ID of owner */
-    unsigned      st_rdev;     /* device type (if inode device) */
-    off_t         st_size;     /* total size, in bytes */
-    unsigned long st_blksize;  /* blocksize for filesystem I/O */
-    unsigned long st_blocks;   /* number of blocks allocated */
-    unsigned long yst_atime;    /* time of last access */
-    unsigned long yst_mtime;    /* time of last modification */
-    unsigned long yst_ctime;    /* time of last change */
-};
 
-int yaffs_open(const char *path, int oflag, int mode) ;
-int yaffs_read(int fd, void *buf, unsigned int nbyte) ;
-int yaffs_write(int fd, const void *buf, unsigned int nbyte) ;
-int yaffs_close(int fd) ;
-off_t yaffs_lseek(int fd, off_t offset, int whence) ;
-int yaffs_truncate(int fd, off_t newSize);
+int yaffs_sync(const YCHAR *path) ;
 
-int yaffs_unlink(const char *path) ;
-int yaffs_rename(const char *oldPath, const char *newPath) ;
+int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath);
+int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz);
 
-int yaffs_stat(const char *path, struct yaffs_stat *buf) ;
-int yaffs_lstat(const char *path, struct yaffs_stat *buf) ;
-int yaffs_fstat(int fd, struct yaffs_stat *buf) ;
+int yaffs_link(const YCHAR *oldpath, const YCHAR *newpath);
+int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev);
 
-int yaffs_chmod(const char *path, mode_t mode);
-int yaffs_fchmod(int fd, mode_t mode);
+loff_t yaffs_freespace(const YCHAR *path);
+loff_t yaffs_totalspace(const YCHAR *path);
 
-int yaffs_mkdir(const char *path, mode_t mode) ;
-int yaffs_rmdir(const char *path) ;
+int yaffs_inodecount(const YCHAR *path);
 
-yaffs_DIR *yaffs_opendir(const char *dirname) ;
-struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp) ;
-void yaffs_rewinddir(yaffs_DIR *dirp) ;
-int yaffs_closedir(yaffs_DIR *dirp) ;
+int yaffs_n_handles(const YCHAR *path);
 
-int yaffs_mount(const char *path) ;
-int yaffs_unmount(const char *path) ;
+#define YAFFS_SHARE_READ  1
+#define YAFFS_SHARE_WRITE 2
+int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int shareMode);
 
-int yaffs_symlink(const char *oldpath, const char *newpath);
-int yaffs_readlink(const char *path, char *buf, int bufsiz);
+struct yaffs_dev;
+void yaffs_add_device(struct yaffs_dev *dev);
 
-int yaffs_link(const char *oldpath, const char *newpath);
-int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
+int yaffs_start_up(void);
+int yaffsfs_GetLastError(void);
 
-loff_t yaffs_freespace(const char *path);
+/* Functions to iterate through devices. NB Use with extreme care! */
+void yaffs_dev_rewind(void);
+struct yaffs_dev *yaffs_next_dev(void);
 
-void yaffs_initialise(yaffsfs_DeviceConfiguration *configList);
+/* Function to get the last error */
+int yaffs_get_error(void);
+const char *yaffs_error_to_str(int err);
 
-int yaffs_StartUp(void);
+/* Function only for debugging */
+void *yaffs_getdev(const YCHAR *path);
+int yaffs_dump_dev(const YCHAR *path);
+int yaffs_set_error(int error);
 
+/* Trace control functions */
+unsigned  yaffs_set_trace(unsigned tm);
+unsigned  yaffs_get_trace(void);
 #endif
diff --git a/fs/yaffs2/ydirectenv.h b/fs/yaffs2/ydirectenv.h
index b555810..df0b8fb 100644
--- a/fs/yaffs2/ydirectenv.h
+++ b/fs/yaffs2/ydirectenv.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -20,73 +20,75 @@
 #ifndef __YDIRECTENV_H__
 #define __YDIRECTENV_H__
 
-/* Direct interface */
-
-#include "devextras.h"
-
-/* XXX U-BOOT XXX */
-#if 0
 #include "stdlib.h"
 #include "stdio.h"
 #include "string.h"
-#include "assert.h"
-#endif
-#include "yaffs_malloc.h"
+#include "yaffs_osglue.h"
+#include "yaffs_hweight.h"
+
+void yaffs_bug_fn(const char *file_name, int line_no);
+
+#define BUG() do { yaffs_bug_fn(__FILE__, __LINE__); } while (0)
 
-/* XXX U-BOOT XXX */
-#if 0
-#define YBUG() assert(1)
-#endif
 
 #define YCHAR char
 #define YUCHAR unsigned char
 #define _Y(x) x
-#define yaffs_strcpy(a,b)    strcpy(a,b)
-#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
-#define yaffs_strncmp(a,b,c) strncmp(a,b,c)
-#define yaffs_strlen(s)	     strlen(s)
-#define yaffs_sprintf	     sprintf
-#define yaffs_toupper(a)     toupper(a)
-
-#ifdef NO_Y_INLINE
-#define Y_INLINE
+
+#define yaffs_strcat(a, b)	strcat(a, b)
+#define yaffs_strcpy(a, b)	strcpy(a, b)
+#define yaffs_strncpy(a, b, c)	strncpy(a, b, c)
+#define yaffs_strnlen(s, m)	strnlen(s, m)
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+#define yaffs_strcmp(a, b)	strcasecmp(a, b)
+#define yaffs_strncmp(a, b, c)	strncasecmp(a, b, c)
 #else
-#define Y_INLINE inline
+#define yaffs_strcmp(a, b)	strcmp(a, b)
+#define yaffs_strncmp(a, b, c)	strncmp(a, b, c)
 #endif
 
-#define YMALLOC(x) yaffs_malloc(x)
-#define YFREE(x)   free(x)
-#define YMALLOC_ALT(x) yaffs_malloc(x)
-#define YFREE_ALT(x)   free(x)
+#define hweight8(x)	yaffs_hweight8(x)
+#define hweight32(x)	yaffs_hweight32(x)
 
-#define YMALLOC_DMA(x) yaffs_malloc(x)
+void yaffs_qsort(void *aa, size_t n, size_t es,
+		int (*cmp)(const void *, const void *));
 
-#define YYIELD()  do {} while(0)
+#define sort(base, n, sz, cmp_fn, swp) yaffs_qsort(base, n, sz, cmp_fn)
 
+#define YAFFS_PATH_DIVIDERS  "/"
 
+#ifdef NO_inline
+#define inline
+#else
+#define inline __inline__
+#endif
 
-//#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s))
-//#define YALERT(s) YINFO(s)
+#define kmalloc(x, flags) yaffsfs_malloc(x)
+#define kfree(x)   yaffsfs_free(x)
+#define vmalloc(x) yaffsfs_malloc(x)
+#define vfree(x) yaffsfs_free(x)
 
+#define cond_resched()  do {} while (0)
 
-#define TENDSTR "\n"
-#define TSTR(x) x
-#define TOUT(p) printf p
+#define yaffs_trace(msk, fmt, ...) do { \
+	if (yaffs_trace_mask & (msk)) \
+		printf("yaffs: " fmt "\n", ##__VA_ARGS__); \
+} while (0)
 
 
 #define YAFFS_LOSTNFOUND_NAME		"lost+found"
 #define YAFFS_LOSTNFOUND_PREFIX		"obj"
-//#define YPRINTF(x) printf x
 
 #include "yaffscfg.h"
 
 #define Y_CURRENT_TIME yaffsfs_CurrentTime()
 #define Y_TIME_CONVERT(x) x
 
-#define YAFFS_ROOT_MODE				0666
+#define YAFFS_ROOT_MODE			0666
 #define YAFFS_LOSTNFOUND_MODE		0666
 
-#define yaffs_SumCompare(x,y) ((x) == (y))
-#define yaffs_strcmp(a,b) strcmp(a,b)
+#include "yaffs_list.h"
+
+#include "yaffsfs.h"
 
 #endif
diff --git a/fs/yaffs2/yportenv.h b/fs/yaffs2/yportenv.h
index bbab14d..b47a4d6 100644
--- a/fs/yaffs2/yportenv.h
+++ b/fs/yaffs2/yportenv.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -17,82 +17,62 @@
 #ifndef __YPORTENV_H__
 #define __YPORTENV_H__
 
-/* XXX U-BOOT XXX */
-#ifndef CONFIG_YAFFS_DIRECT
-#define CONFIG_YAFFS_DIRECT
+
+/* Definition of types */
+#ifdef CONFIG_YAFFS_DEFINES_TYPES
+typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned u32;
 #endif
 
-#if defined CONFIG_YAFFS_WINCE
 
-#include "ywinceenv.h"
+#ifdef CONFIG_YAFFS_PROVIDE_DEFS
+/* File types */
+
+
+#define DT_UNKNOWN	0
+#define DT_FIFO		1
+#define DT_CHR		2
+#define DT_DIR		4
+#define DT_BLK		6
+#define DT_REG		8
+#define DT_LNK		10
+#define DT_SOCK		12
+#define DT_WHT		14
+
+
+/*
+ * Attribute flags.
+ * These are or-ed together to select what has been changed.
+ */
+#define ATTR_MODE	1
+#define ATTR_UID	2
+#define ATTR_GID	4
+#define ATTR_SIZE	8
+#define ATTR_ATIME	16
+#define ATTR_MTIME	32
+#define ATTR_CTIME	64
+
+struct iattr {
+	unsigned int ia_valid;
+	unsigned ia_mode;
+	unsigned ia_uid;
+	unsigned ia_gid;
+	unsigned ia_size;
+	unsigned ia_atime;
+	unsigned ia_mtime;
+	unsigned ia_ctime;
+	unsigned int ia_attr_flags;
+};
 
-/* XXX U-BOOT XXX */
-#elif  0 /* defined __KERNEL__ */
-
-#include "moduleconfig.h"
-
-/* Linux kernel */
-#include <linux/version.h>
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
-#include <linux/config.h>
-#endif
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-
-#define YCHAR char
-#define YUCHAR unsigned char
-#define _Y(x)     x
-#define yaffs_strcpy(a,b)    strcpy(a,b)
-#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
-#define yaffs_strncmp(a,b,c) strncmp(a,b,c)
-#define yaffs_strlen(s)	     strlen(s)
-#define yaffs_sprintf	     sprintf
-#define yaffs_toupper(a)     toupper(a)
-
-#define Y_INLINE inline
-
-#define YAFFS_LOSTNFOUND_NAME		"lost+found"
-#define YAFFS_LOSTNFOUND_PREFIX		"obj"
-
-/* #define YPRINTF(x) printk x */
-#define YMALLOC(x) kmalloc(x,GFP_KERNEL)
-#define YFREE(x)   kfree(x)
-#define YMALLOC_ALT(x) vmalloc(x)
-#define YFREE_ALT(x)   vfree(x)
-#define YMALLOC_DMA(x) YMALLOC(x)
-
-// KR - added for use in scan so processes aren't blocked indefinitely.
-#define YYIELD() schedule()
-
-#define YAFFS_ROOT_MODE			0666
-#define YAFFS_LOSTNFOUND_MODE		0666
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
-#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
-#define Y_TIME_CONVERT(x) (x).tv_sec
-#else
-#define Y_CURRENT_TIME CURRENT_TIME
-#define Y_TIME_CONVERT(x) (x)
 #endif
 
-#define yaffs_SumCompare(x,y) ((x) == (y))
-#define yaffs_strcmp(a,b) strcmp(a,b)
 
-#define TENDSTR "\n"
-#define TSTR(x) KERN_WARNING x
-#define TOUT(p) printk p
 
-#define yaffs_trace(mask, fmt, args...) \
-	do { if ((mask) & (yaffs_traceMask|YAFFS_TRACE_ERROR)) \
-		printk(KERN_WARNING "yaffs: " fmt, ## args); \
-	} while (0)
+#if defined CONFIG_YAFFS_WINCE
+
+#include "ywinceenv.h"
 
-#define compile_time_assertion(assertion) \
-	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
 
 #elif defined CONFIG_YAFFS_DIRECT
 
@@ -101,93 +81,228 @@
 
 #elif defined CONFIG_YAFFS_UTIL
 
-/* Stuff for YAFFS utilities */
+#include "yutilsenv.h"
 
-#include "stdlib.h"
-#include "stdio.h"
-#include "string.h"
+#else
+/* Should have specified a configuration type */
+#error Unknown configuration
 
-#include "devextras.h"
+#endif
 
-#define YMALLOC(x) malloc(x)
-#define YFREE(x)   free(x)
-#define YMALLOC_ALT(x) malloc(x)
-#define YFREE_ALT(x) free(x)
+#if defined(CONFIG_YAFFS_DIRECT) || defined(CONFIG_YAFFS_WINCE)
 
-#define YCHAR char
-#define YUCHAR unsigned char
-#define _Y(x)     x
-#define yaffs_strcpy(a,b)    strcpy(a,b)
-#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
-#define yaffs_strlen(s)	     strlen(s)
-#define yaffs_sprintf	     sprintf
-#define yaffs_toupper(a)     toupper(a)
+#ifdef CONFIG_YAFFSFS_PROVIDE_VALUES
 
-#define Y_INLINE inline
+#ifndef O_RDONLY
+#define O_RDONLY	00
+#endif
 
-/* #define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) */
-/* #define YALERT(s) YINFO(s) */
+#ifndef O_WRONLY
+#define O_WRONLY	01
+#endif
 
-#define TENDSTR "\n"
-#define TSTR(x) x
-#define TOUT(p) printf p
+#ifndef O_RDWR
+#define O_RDWR		02
+#endif
 
-#define YAFFS_LOSTNFOUND_NAME		"lost+found"
-#define YAFFS_LOSTNFOUND_PREFIX		"obj"
-/* #define YPRINTF(x) printf x */
+#ifndef O_CREAT
+#define O_CREAT		0100
+#endif
 
-#define YAFFS_ROOT_MODE				0666
-#define YAFFS_LOSTNFOUND_MODE		0666
+#ifndef O_EXCL
+#define O_EXCL		0200
+#endif
 
-#define yaffs_SumCompare(x,y) ((x) == (y))
-#define yaffs_strcmp(a,b) strcmp(a,b)
+#ifndef O_TRUNC
+#define O_TRUNC		01000
+#endif
 
-#else
-/* Should have specified a configuration type */
-#error Unknown configuration
+#ifndef O_APPEND
+#define O_APPEND	02000
+#endif
 
+#ifndef SEEK_SET
+#define SEEK_SET	0
 #endif
 
-/* see yaffs_fs.c */
-extern unsigned int yaffs_traceMask;
-extern unsigned int yaffs_wr_attempts;
+#ifndef SEEK_CUR
+#define SEEK_CUR	1
+#endif
 
-/*
- * Tracing flags.
- * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
- */
+#ifndef SEEK_END
+#define SEEK_END	2
+#endif
+
+#ifndef EBUSY
+#define EBUSY	16
+#endif
+
+#ifndef ENODEV
+#define ENODEV	19
+#endif
+
+#ifndef EINVAL
+#define EINVAL	22
+#endif
+
+#ifndef ENFILE
+#define ENFILE	23
+#endif
+
+#ifndef EBADF
+#define EBADF	9
+#endif
+
+#ifndef EACCES
+#define EACCES	13
+#endif
+
+#ifndef EXDEV
+#define EXDEV	18
+#endif
+
+#ifndef ENOENT
+#define ENOENT	2
+#endif
+
+#ifndef ENOSPC
+#define ENOSPC	28
+#endif
+
+#ifndef EROFS
+#define EROFS	30
+#endif
+
+#ifndef ERANGE
+#define ERANGE 34
+#endif
+
+#ifndef ENODATA
+#define ENODATA 61
+#endif
+
+#ifndef ENOTEMPTY
+#define ENOTEMPTY 39
+#endif
+
+#ifndef ENAMETOOLONG
+#define ENAMETOOLONG 36
+#endif
+
+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+#ifndef EFAULT
+#define EFAULT 14
+#endif
+
+#ifndef EEXIST
+#define EEXIST 17
+#endif
+
+#ifndef ENOTDIR
+#define ENOTDIR 20
+#endif
+
+#ifndef EISDIR
+#define EISDIR 21
+#endif
+
+#ifndef ELOOP
+#define ELOOP	40
+#endif
+
+
+/* Mode flags */
+
+#ifndef S_IFMT
+#define S_IFMT		0170000
+#endif
+
+#ifndef S_IFSOCK
+#define S_IFSOCK	0140000
+#endif
+
+#ifndef S_IFIFO
+#define S_IFIFO		0010000
+#endif
+
+#ifndef S_IFCHR
+#define S_IFCHR		0020000
+#endif
+
+#ifndef S_IFBLK
+#define S_IFBLK		0060000
+#endif
+
+#ifndef S_IFLNK
+#define S_IFLNK		0120000
+#endif
+
+#ifndef S_IFDIR
+#define S_IFDIR		0040000
+#endif
+
+#ifndef S_IFREG
+#define S_IFREG		0100000
+#endif
+
+#define S_ISSOCK(m)	(((m) & S_IFMT) == S_IFSOCK)
+#define S_ISLNK(m)	(((m) & S_IFMT) == S_IFLNK)
+#define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)
+#define S_ISREG(m)	(((m) & S_IFMT) == S_IFREG)
+#define S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)
+#define S_ISCHR(m)	(((m) & S_IFMT) == S_IFCHR)
+#define S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)
+
+
+#ifndef S_IREAD
+#define S_IREAD		0000400
+#endif
+
+#ifndef S_IWRITE
+#define	S_IWRITE	0000200
+#endif
+
+#ifndef S_IEXEC
+#define	S_IEXEC	0000100
+#endif
+
+#ifndef XATTR_CREATE
+#define XATTR_CREATE 1
+#endif
+
+#ifndef XATTR_REPLACE
+#define XATTR_REPLACE 2
+#endif
+
+#ifndef R_OK
+#define R_OK	4
+#define W_OK	2
+#define X_OK	1
+#define F_OK	0
+#endif
+
+#else
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#endif
+
+#endif
+
+#ifndef Y_DUMP_STACK
+#define Y_DUMP_STACK() do { } while (0)
+#endif
 
-#define YAFFS_TRACE_OS			0x00000002
-#define YAFFS_TRACE_ALLOCATE		0x00000004
-#define YAFFS_TRACE_SCAN		0x00000008
-#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
-#define YAFFS_TRACE_ERASE		0x00000020
-#define YAFFS_TRACE_GC			0x00000040
-#define YAFFS_TRACE_WRITE		0x00000080
-#define YAFFS_TRACE_TRACING		0x00000100
-#define YAFFS_TRACE_DELETION		0x00000200
-#define YAFFS_TRACE_BUFFERS		0x00000400
-#define YAFFS_TRACE_NANDACCESS		0x00000800
-#define YAFFS_TRACE_GC_DETAIL		0x00001000
-#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
-#define YAFFS_TRACE_MTD			0x00004000
-#define YAFFS_TRACE_CHECKPOINT		0x00008000
-
-#define YAFFS_TRACE_VERIFY		0x00010000
-#define YAFFS_TRACE_VERIFY_NAND		0x00020000
-#define YAFFS_TRACE_VERIFY_FULL		0x00040000
-#define YAFFS_TRACE_VERIFY_ALL		0x000F0000
-
-
-#define YAFFS_TRACE_ERROR		0x40000000
-#define YAFFS_TRACE_BUG			0x80000000
-#define YAFFS_TRACE_ALWAYS		0xF0000000
-
-
-#define T(mask,p) do{ if((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p);} while(0)
-
-#ifndef CONFIG_YAFFS_WINCE
-#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),__LINE__))
+#ifndef BUG
+#define BUG() do {\
+	yaffs_trace(YAFFS_TRACE_BUG,\
+		"==>> yaffs bug: " __FILE__ " %d",\
+		__LINE__);\
+	Y_DUMP_STACK();\
+} while (0)
 #endif
 
 #endif