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Diffstat (limited to 'include/jffs2/jffs2.h')
| -rw-r--r-- | include/jffs2/jffs2.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/include/jffs2/jffs2.h b/include/jffs2/jffs2.h new file mode 100644 index 0000000..9098690 --- /dev/null +++ b/include/jffs2/jffs2.h @@ -0,0 +1,208 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright (C) 2001 Red Hat, Inc. + * + * Created by David Woodhouse <dwmw2@cambridge.redhat.com> + * + * The original JFFS, from which the design for JFFS2 was derived, + * was designed and implemented by Axis Communications AB. + * + * The contents of this file are subject to the Red Hat eCos Public + * License Version 1.1 (the "Licence"); you may not use this file + * except in compliance with the Licence. You may obtain a copy of + * the Licence at http://www.redhat.com/ + * + * Software distributed under the Licence is distributed on an "AS IS" + * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. + * See the Licence for the specific language governing rights and + * limitations under the Licence. + * + * The Original Code is JFFS2 - Journalling Flash File System, version 2 + * + * Alternatively, the contents of this file may be used under the + * terms of the GNU General Public License version 2 (the "GPL"), in + * which case the provisions of the GPL are applicable instead of the + * above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the RHEPL, indicate your decision by + * deleting the provisions above and replace them with the notice and + * other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file + * under either the RHEPL or the GPL. + * + * $Id: jffs2.h,v 1.2 2002/01/17 00:53:20 nyet Exp $ + * + */ + +#ifndef __LINUX_JFFS2_H__ +#define __LINUX_JFFS2_H__ + +#include <asm/types.h> +#include <jffs2/load_kernel.h> + +#define JFFS2_SUPER_MAGIC 0x72b6 + +/* Values we may expect to find in the 'magic' field */ +#define JFFS2_OLD_MAGIC_BITMASK 0x1984 +#define JFFS2_MAGIC_BITMASK 0x1985 +#define KSAMTIB_CIGAM_2SFFJ 0x5981 /* For detecting wrong-endian fs */ +#define JFFS2_EMPTY_BITMASK 0xffff +#define JFFS2_DIRTY_BITMASK 0x0000 + +/* We only allow a single char for length, and 0xFF is empty flash so + we don't want it confused with a real length. Hence max 254. +*/ +#define JFFS2_MAX_NAME_LEN 254 + +/* How small can we sensibly write nodes? */ +#define JFFS2_MIN_DATA_LEN 128 + +#define JFFS2_COMPR_NONE 0x00 +#define JFFS2_COMPR_ZERO 0x01 +#define JFFS2_COMPR_RTIME 0x02 +#define JFFS2_COMPR_RUBINMIPS 0x03 +#define JFFS2_COMPR_COPY 0x04 +#define JFFS2_COMPR_DYNRUBIN 0x05 +#define JFFS2_COMPR_ZLIB 0x06 +#define JFFS2_NUM_COMPR 7 + +/* Compatibility flags. */ +#define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ +#define JFFS2_NODE_ACCURATE 0x2000 +/* INCOMPAT: Fail to mount the filesystem */ +#define JFFS2_FEATURE_INCOMPAT 0xc000 +/* ROCOMPAT: Mount read-only */ +#define JFFS2_FEATURE_ROCOMPAT 0x8000 +/* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ +#define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 +/* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ +#define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 + +#define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) +#define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2) +#define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) + +/* Maybe later... */ +/*#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) */ +/*#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4) */ + +/* Same as the non_ECC versions, but with extra space for real + * ECC instead of just the checksum. For use on NAND flash + */ +/*#define JFFS2_NODETYPE_DIRENT_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 5) */ +/*#define JFFS2_NODETYPE_INODE_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 6) */ + +#define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at + mount time, don't wait for it to + happen later */ +#define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific + compression type */ + + +struct jffs2_unknown_node +{ + /* All start like this */ + __u16 magic; + __u16 nodetype; + __u32 totlen; /* So we can skip over nodes we don't grok */ + __u32 hdr_crc; +} __attribute__((packed)); + +struct jffs2_raw_dirent +{ + __u16 magic; + __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */ + __u32 totlen; + __u32 hdr_crc; + __u32 pino; + __u32 version; + __u32 ino; /* == zero for unlink */ + __u32 mctime; + __u8 nsize; + __u8 type; + __u8 unused[2]; + __u32 node_crc; + __u32 name_crc; + __u8 name[0]; +} __attribute__((packed)); + +/* The JFFS2 raw inode structure: Used for storage on physical media. */ +/* The uid, gid, atime, mtime and ctime members could be longer, but + are left like this for space efficiency. If and when people decide + they really need them extended, it's simple enough to add support for + a new type of raw node. +*/ +struct jffs2_raw_inode +{ + __u16 magic; /* A constant magic number. */ + __u16 nodetype; /* == JFFS_NODETYPE_INODE */ + __u32 totlen; /* Total length of this node (inc data, etc.) */ + __u32 hdr_crc; + __u32 ino; /* Inode number. */ + __u32 version; /* Version number. */ + __u32 mode; /* The file's type or mode. */ + __u16 uid; /* The file's owner. */ + __u16 gid; /* The file's group. */ + __u32 isize; /* Total resultant size of this inode (used for truncations) */ + __u32 atime; /* Last access time. */ + __u32 mtime; /* Last modification time. */ + __u32 ctime; /* Change time. */ + __u32 offset; /* Where to begin to write. */ + __u32 csize; /* (Compressed) data size */ + __u32 dsize; /* Size of the node's data. (after decompression) */ + __u8 compr; /* Compression algorithm used */ + __u8 usercompr; /* Compression algorithm requested by the user */ + __u16 flags; /* See JFFS2_INO_FLAG_* */ + __u32 data_crc; /* CRC for the (compressed) data. */ + __u32 node_crc; /* CRC for the raw inode (excluding data) */ +/* __u8 data[dsize]; */ +} __attribute__((packed)); + +union jffs2_node_union { + struct jffs2_raw_inode i; + struct jffs2_raw_dirent d; + struct jffs2_unknown_node u; +} __attribute__((packed)); + +enum + { + DT_UNKNOWN = 0, +# define DT_UNKNOWN DT_UNKNOWN + DT_FIFO = 1, +# define DT_FIFO DT_FIFO + DT_CHR = 2, +# define DT_CHR DT_CHR + DT_DIR = 4, +# define DT_DIR DT_DIR + DT_BLK = 6, +# define DT_BLK DT_BLK + DT_REG = 8, +# define DT_REG DT_REG + DT_LNK = 10, +# define DT_LNK DT_LNK + DT_SOCK = 12, +# define DT_SOCK DT_SOCK + DT_WHT = 14 +# define DT_WHT DT_WHT + }; + + +u32 jffs2_1pass_ls(struct part_info *part,const char *fname); +u32 jffs2_1pass_load(char *dest, struct part_info *part,const char *fname); +u32 jffs2_1pass_info(struct part_info *part); + +void rtime_decompress(unsigned char *data_in, unsigned char *cpage_out, u32 + srclen, u32 destlen); +void rubin_do_decompress(unsigned char *bits, unsigned char *in, unsigned char + *page_out, __u32 destlen); +void dynrubin_decompress(unsigned char *data_in, unsigned char *cpage_out, + unsigned long sourcelen, unsigned long dstlen); +long zlib_decompress(unsigned char *data_in, unsigned char *cpage_out, + __u32 srclen, __u32 destlen); + + + + + +#endif /* __LINUX_JFFS2_H__ */ |