ext2fs support added

3 files changed, 1194 insertions, 0 deletions

diff --git a/fs/ext2/Makefile b/fs/ext2/Makefile
new file mode 100644
index 0000000..3b19368
--- /dev/null
+++ b/fs/ext2/Makefile
@@ -0,0 +1,48 @@
+#
+# (C) Copyright 2003
+# Pavel Bartusek, Sysgo Real-Time Solutions AG, pba@sysgo.de
+#
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= libext2fs.a
+
+AOBJS	=
+COBJS	= ext2fs.o dev.o
+OBJS	= $(AOBJS) $(COBJS)
+
+#CPPFLAGS +=
+
+all:	$(LIB) $(AOBJS)
+
+$(LIB):	.depend $(OBJS)
+	$(AR) crv $@ $(OBJS)
+
+
+#########################################################################
+
+.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
+		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+
+sinclude .depend
+
+#########################################################################
diff --git a/fs/ext2/dev.c b/fs/ext2/dev.c
new file mode 100644
index 0000000..117a449
--- /dev/null
+++ b/fs/ext2/dev.c
@@ -0,0 +1,142 @@
+/*
+ * (C) Copyright 2004
+ *  esd gmbh <www.esd-electronics.com>
+ *  Reinhard Arlt <reinhard.arlt@esd-electronics.com>
+ *
+ *  based on code of fs/reiserfs/dev.c by
+ *
+ *  (C) Copyright 2003 - 2004
+ *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+#include <common.h>
+#if (CONFIG_COMMANDS & CFG_CMD_EXT2)
+
+#include <config.h>
+#include <ext2fs.h>
+
+static block_dev_desc_t *ext2fs_block_dev_desc;
+static disk_partition_t part_info;
+
+#undef DEBUG
+int ext2fs_set_blk_dev
+    (
+    block_dev_desc_t *rbdd, 
+    int               part
+    )
+    {
+    ext2fs_block_dev_desc = rbdd;
+
+    if (part == 0) 
+        {
+	/* disk doesn't use partition table */
+	part_info.start = 0;
+	part_info.size = rbdd->lba;
+	part_info.blksz = rbdd->blksz;
+	} 
+    else 
+        {
+	if (get_partition_info (ext2fs_block_dev_desc, part, &part_info)) 
+	    {
+	    return 0;
+	    }
+	}
+    return (part_info.size);
+    }
+
+
+int ext2fs_devread 
+    (
+    int   sector, 
+    int   byte_offset, 
+    int   byte_len, 
+    char *buf
+    )
+    {
+    char sec_buf[SECTOR_SIZE];
+    unsigned block_len;
+/*
+ *  Check partition boundaries
+ */
+    if ((sector < 0) || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= part_info.size)) 
+        {
+/*      errnum = ERR_OUTSIDE_PART; */
+	printf (" ** ext2fs_devread() read outside partition sector %d\n", sector);
+	return(0);
+	}
+
+/*
+ *  Get the read to the beginning of a partition.
+ */
+    sector += byte_offset >> SECTOR_BITS;
+    byte_offset &= SECTOR_SIZE - 1;
+
+#if defined(DEBUG)
+    printf (" <%d, %d, %d>\n", sector, byte_offset, byte_len);
+#endif
+
+    if (ext2fs_block_dev_desc == NULL)
+        {
+        printf("** Invalid Block Device Descriptor (NULL)\n");
+	return(0);
+	}
+
+    if (byte_offset != 0) 
+        {
+/*      read first part which isn't aligned with start of sector */
+	if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev, part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) 
+	    {
+	    printf (" ** ext2fs_devread() read error **\n");
+	    return(0);
+	    }
+	memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
+	buf+=min(SECTOR_SIZE-byte_offset, byte_len);
+	byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
+	sector++;
+	}
+
+/*  read sector aligned part */
+    block_len = byte_len & ~(SECTOR_SIZE-1);
+    if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev, 
+					  part_info.start+sector, 
+					  block_len/SECTOR_SIZE, 
+					  (unsigned long *)buf) != block_len/SECTOR_SIZE) 
+        {
+	printf (" ** ext2fs_devread() read error - block\n");
+	return(0);
+	}
+    buf+=block_len;
+    byte_len-=block_len;
+    sector+= block_len/SECTOR_SIZE;
+
+    if (byte_len != 0) 
+        {
+/*      read rest of data which are not in whole sector */
+	if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev,
+					      part_info.start+sector, 
+					      1, 
+					      (unsigned long *)sec_buf) != 1) 
+	    {
+	    printf (" ** ext2fs_devread() read error - last part\n");
+	    return(0);
+	    }
+	memcpy(buf, sec_buf, byte_len);
+	}
+    return(1);
+    }
+#endif /* CFG_CMD_EXT2FS */
diff --git a/fs/ext2/ext2fs.c b/fs/ext2/ext2fs.c
new file mode 100644
index 0000000..bae72a3
--- /dev/null
+++ b/fs/ext2/ext2fs.c
@@ -0,0 +1,1004 @@
+/*
+ * (C) Copyright 2004
+ *  esd gmbh <www.esd-electronics.com>
+ *  Reinhard Arlt <reinhard.arlt@esd-electronics.com>
+ *
+ *  based on code from grub2 fs/ext2.c and fs/fshelp.c by
+ *
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2003, 2004  Free Software Foundation, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <common.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_EXT2)
+#include <ext2fs.h>
+#include <malloc.h>
+#include <asm/byteorder.h>
+
+extern int ext2fs_devread (int sector, int byte_offset, int byte_len, char *buf);
+
+/* Magic value used to identify an ext2 filesystem.  */
+#define	EXT2_MAGIC		0xEF53
+/* Amount of indirect blocks in an inode.  */
+#define INDIRECT_BLOCKS		12
+/* Maximum lenght of a pathname.  */
+#define EXT2_PATH_MAX		4096
+/* Maximum nesting of symlinks, used to prevent a loop.  */
+#define	EXT2_MAX_SYMLINKCNT	8
+
+/* Filetype used in directory entry.  */
+#define	FILETYPE_UNKNOWN	0
+#define	FILETYPE_REG		1
+#define	FILETYPE_DIRECTORY	2
+#define	FILETYPE_SYMLINK	7
+
+/* Filetype information as used in inodes.  */
+#define FILETYPE_INO_MASK	0170000
+#define FILETYPE_INO_REG	0100000
+#define FILETYPE_INO_DIRECTORY	0040000
+#define FILETYPE_INO_SYMLINK	0120000
+
+/* Bits used as offset in sector */
+#define DISK_SECTOR_BITS        9
+
+/* Log2 size of ext2 block in 512 blocks.  */
+#define LOG2_EXT2_BLOCK_SIZE(data) (__le32_to_cpu (data->sblock.log2_block_size) + 1)
+
+/* Log2 size of ext2 block in bytes.  */
+#define LOG2_BLOCK_SIZE(data)	   (__le32_to_cpu (data->sblock.log2_block_size) + 10)
+
+/* The size of an ext2 block in bytes.  */
+#define EXT2_BLOCK_SIZE(data)	   (1 << LOG2_BLOCK_SIZE(data))
+
+/* The ext2 superblock.  */
+struct ext2_sblock
+{
+	uint32_t total_inodes;
+	uint32_t total_blocks;
+	uint32_t reserved_blocks;
+	uint32_t free_blocks;
+	uint32_t free_inodes;
+	uint32_t first_data_block;
+	uint32_t log2_block_size;
+	uint32_t log2_fragment_size;
+	uint32_t blocks_per_group;
+	uint32_t fragments_per_group;
+	uint32_t inodes_per_group;
+	uint32_t mtime;
+	uint32_t utime;
+	uint16_t mnt_count;
+	uint16_t max_mnt_count;
+	uint16_t magic;
+	uint16_t fs_state;
+	uint16_t error_handling;
+	uint16_t minor_revision_level;
+	uint32_t lastcheck;
+	uint32_t checkinterval;
+	uint32_t creator_os;
+	uint32_t revision_level;
+	uint16_t uid_reserved;
+	uint16_t gid_reserved;
+	uint32_t first_inode;
+	uint16_t inode_size;
+	uint16_t block_group_number;
+	uint32_t feature_compatibility;
+	uint32_t feature_incompat;
+	uint32_t feature_ro_compat;
+	uint32_t unique_id[4];
+	char volume_name[16];
+	char last_mounted_on[64];
+	uint32_t compression_info;
+};
+
+/* The ext2 blockgroup.  */
+struct ext2_block_group
+{
+	uint32_t block_id;
+	uint32_t inode_id;
+	uint32_t inode_table_id;
+	uint16_t free_blocks;
+	uint16_t free_inodes;
+	uint16_t pad;
+	uint32_t reserved[3];
+};
+
+/* The ext2 inode.  */
+struct ext2_inode
+{
+	uint16_t mode;
+	uint16_t uid;
+	uint32_t size;
+	uint32_t atime;
+	uint32_t ctime;
+	uint32_t mtime;
+	uint32_t dtime;
+	uint16_t gid;
+	uint16_t nlinks;
+	uint32_t blockcnt;  /* Blocks of 512 bytes!! */
+	uint32_t flags;
+	uint32_t osd1;
+	union
+        {
+		struct datablocks
+		{
+			uint32_t dir_blocks[INDIRECT_BLOCKS];
+			uint32_t indir_block;
+			uint32_t double_indir_block;
+			uint32_t tripple_indir_block;
+		} blocks;
+		char symlink[60];
+        } b;
+	uint32_t version;
+	uint32_t acl;
+	uint32_t dir_acl;
+	uint32_t fragment_addr;
+	uint32_t osd2[3];
+};
+
+/* The header of an ext2 directory entry.  */
+struct ext2_dirent
+{
+	uint32_t inode;
+	uint16_t direntlen;
+	uint8_t  namelen;
+	uint8_t  filetype;
+};
+
+struct ext2fs_node
+{
+	struct ext2_data *data;
+	struct ext2_inode inode;
+	int               ino;
+	int               inode_read;
+};
+
+/* Information about a "mounted" ext2 filesystem.  */
+struct ext2_data
+{
+	struct ext2_sblock sblock;
+	struct ext2_inode *inode;
+	struct ext2fs_node diropen;
+};
+
+
+typedef struct ext2fs_node *ext2fs_node_t;
+
+struct ext2_data *ext2fs_root  = NULL;
+ext2fs_node_t     ext2fs_file  = NULL;
+int               symlinknest  = 0;
+uint32_t         *indir1_block = NULL;
+int               indir1_size  = 0;
+int               indir1_blkno = -1;
+uint32_t         *indir2_block = NULL;
+int               indir2_size  = 0;
+int               indir2_blkno = -1;
+
+
+static int ext2fs_blockgroup
+(
+	struct ext2_data         *data,
+	int                      group,
+	struct ext2_block_group *blkgrp
+	)
+{
+#ifdef DEBUG
+	printf("ext2fs read blockgroup\n");
+#endif
+	return(ext2fs_devread (((__le32_to_cpu (data->sblock.first_data_block) + 1) << LOG2_EXT2_BLOCK_SIZE (data)),
+			       group * sizeof (struct ext2_block_group),
+			       sizeof (struct ext2_block_group),
+			       (char *) blkgrp));
+}
+
+
+static int ext2fs_read_inode
+(
+	struct ext2_data        *data,
+	int                      ino,
+	struct ext2_inode       *inode
+	)
+{
+	struct ext2_block_group  blkgrp;
+	struct ext2_sblock      *sblock = &data->sblock;
+	int                      inodes_per_block;
+	int                      status;
+
+	unsigned int             blkno;
+	unsigned int             blkoff;
+
+	/* It is easier to calculate if the first inode is 0.  */
+	ino--;
+#ifdef DEBUG
+	printf("ext2fs read inode %d\n", ino);
+#endif
+	status = ext2fs_blockgroup (data, ino / __le32_to_cpu(sblock->inodes_per_group), &blkgrp);
+	if (status == 0)
+        {
+		return(0);
+	}
+	inodes_per_block = EXT2_BLOCK_SIZE (data) / 128;
+	blkno =  (ino % __le32_to_cpu (sblock->inodes_per_group)) / inodes_per_block;
+	blkoff = (ino % __le32_to_cpu (sblock->inodes_per_group)) % inodes_per_block;
+#ifdef DEBUG
+	printf("ext2fs read inode blkno %d blkoff %d\n", blkno, blkoff);
+#endif
+	/* Read the inode.  */
+	status = ext2fs_devread(((__le32_to_cpu (blkgrp.inode_table_id) + blkno) << LOG2_EXT2_BLOCK_SIZE (data)),
+				sizeof (struct ext2_inode) * blkoff,
+				sizeof (struct ext2_inode),
+				(char *) inode);
+	if (status == 0)
+        {
+		return(0);
+	}
+	return(1);
+}
+
+
+void ext2fs_free_node
+(
+	ext2fs_node_t node,
+	ext2fs_node_t currroot
+	)
+{
+	if ((node != &ext2fs_root->diropen) && (node != currroot))
+        {
+		free (node);
+	}
+}
+
+
+static int ext2fs_read_block
+(
+	ext2fs_node_t node,
+	int           fileblock
+	)
+{
+	struct ext2_data  *data       = node->data;
+	struct ext2_inode *inode      = &node->inode;
+	int                blknr;
+	int                blksz      = EXT2_BLOCK_SIZE (data);
+	int                log2_blksz = LOG2_EXT2_BLOCK_SIZE (data);
+	int                status;
+
+	/* Direct blocks.  */
+	if (fileblock < INDIRECT_BLOCKS)
+        {
+		blknr = __le32_to_cpu (inode->b.blocks.dir_blocks[fileblock]);
+        }
+	/* Indirect.  */
+	else if (fileblock < (INDIRECT_BLOCKS + (blksz/4)))
+        {
+		if (indir1_block == NULL)
+		{
+			indir1_block = (uint32_t *) malloc(blksz);
+			if (indir1_block == NULL)
+			{
+				printf("** ext2fs read block (indir 1) malloc failed. **\n");
+				return(-1);
+			}
+			indir1_size  = blksz;
+			indir1_blkno = -1;
+		}
+		if (blksz != indir1_size)
+		{
+			free(indir1_block);
+			indir1_block = NULL;
+			indir1_size  = 0;
+			indir1_blkno = -1;
+			indir1_block = (uint32_t *) malloc(blksz);
+			if (indir1_block == NULL)
+			{
+				printf("** ext2fs read block (indir 1) malloc failed. **\n");
+				return(-1);
+			}
+			indir1_size  = blksz;
+		}
+		if ((__le32_to_cpu(inode->b.blocks.indir_block) << log2_blksz) != indir1_blkno)
+		{
+			status = ext2fs_devread (__le32_to_cpu(inode->b.blocks.indir_block) << log2_blksz, 0, blksz, (char *) indir1_block);
+			if (status == 0)
+			{
+				printf("** ext2fs read block (indir 1) failed. **\n");
+				return(0);
+			}
+			indir1_blkno = __le32_to_cpu(inode->b.blocks.indir_block) << log2_blksz;
+		}
+		blknr = __le32_to_cpu(indir1_block[fileblock - INDIRECT_BLOCKS]);
+	}
+	/* Double indirect.  */
+	else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * (blksz  / 4 + 1))))
+        {
+		unsigned int perblock = blksz / 4;
+		unsigned int rblock = fileblock - (INDIRECT_BLOCKS
+						   + blksz / 4);
+
+		if (indir1_block == NULL)
+		{
+			indir1_block = (uint32_t *) malloc(blksz);
+			if (indir1_block == NULL)
+			{
+				printf("** ext2fs read block (indir 2 1) malloc failed. **\n");
+				return(-1);
+			}
+			indir1_size  = blksz;
+			indir1_blkno = -1;
+		}
+		if (blksz != indir1_size)
+		{
+			free(indir1_block);
+			indir1_block = NULL;
+			indir1_size  = 0;
+			indir1_blkno = -1;
+			indir1_block = (uint32_t *) malloc(blksz);
+			if (indir1_block == NULL)
+			{
+				printf("** ext2fs read block (indir 2 1) malloc failed. **\n");
+				return(-1);
+			}
+			indir1_size  = blksz;
+		}
+		if ((__le32_to_cpu(inode->b.blocks.double_indir_block) << log2_blksz) != indir1_blkno)
+		{
+			status = ext2fs_devread (__le32_to_cpu(inode->b.blocks.double_indir_block) << log2_blksz, 0, blksz, (char *) indir1_block);
+			if (status == 0)
+			{
+				printf("** ext2fs read block (indir 2 1) failed. **\n");
+				return(-1);
+			}
+			indir1_blkno = __le32_to_cpu(inode->b.blocks.double_indir_block) << log2_blksz;
+		}
+
+		if (indir2_block == NULL)
+		{
+			indir2_block = (uint32_t *) malloc(blksz);
+			if (indir2_block == NULL)
+			{
+				printf("** ext2fs read block (indir 2 2) malloc failed. **\n");
+				return(-1);
+			}
+			indir2_size  = blksz;
+			indir2_blkno = -1;
+		}
+		if (blksz != indir2_size)
+		{
+			free(indir2_block);
+			indir2_block = NULL;
+			indir2_size  = 0;
+			indir2_blkno = -1;
+			indir2_block = (uint32_t *) malloc(blksz);
+			if (indir2_block == NULL)
+			{
+				printf("** ext2fs read block (indir 2 2) malloc failed. **\n");
+				return(-1);
+			}
+			indir2_size  = blksz;
+		}
+		if ((__le32_to_cpu(indir1_block[rblock / perblock]) << log2_blksz) != indir1_blkno)
+		{
+			status = ext2fs_devread(__le32_to_cpu(indir1_block[rblock / perblock]) << log2_blksz, 0, blksz, (char *) indir2_block);
+			if (status == 0)
+			{
+				printf("** ext2fs read block (indir 2 2) failed. **\n");
+				return(-1);
+			}
+			indir2_blkno = __le32_to_cpu(indir1_block[rblock / perblock]) << log2_blksz;
+		}
+		blknr = __le32_to_cpu(indir2_block[rblock % perblock]);
+	}
+	/* Tripple indirect.  */
+	else
+        {
+		printf("** ext2fs doesn't support tripple indirect blocks. **\n");
+		return(-1);
+        }
+#ifdef DEBUG
+	printf("ext2fs_read_block %08x\n", blknr);
+#endif
+	return(blknr);
+}
+
+
+int ext2fs_read_file
+(
+	ext2fs_node_t node,
+	int           pos,
+	unsigned int  len,
+	char         *buf
+	)
+{
+	int          i;
+	int          blockcnt;
+	int          log2blocksize = LOG2_EXT2_BLOCK_SIZE (node->data);
+	int          blocksize     = 1 << (log2blocksize + DISK_SECTOR_BITS);
+	unsigned int filesize      = node->inode.size;
+
+	/* Adjust len so it we can't read past the end of the file.  */
+	if (len > filesize)
+        {
+		len = filesize;
+	}
+	blockcnt = ((len + pos)  + blocksize - 1) / blocksize;
+
+	for (i = pos / blocksize; i < blockcnt; i++)
+        {
+		int blknr;
+		int blockoff = pos % blocksize;
+		int blockend = blocksize;
+
+		int skipfirst = 0;
+
+		blknr = ext2fs_read_block(node, i);
+		if (blknr < 0)
+		{
+			return(-1);
+		}
+		blknr = blknr << log2blocksize;
+
+		/* Last block.  */
+		if (i == blockcnt - 1)
+		{
+			blockend = (len + pos) % blocksize;
+
+			/* The last portion is exactly blocksize.  */
+			if (!blockend)
+			{
+				blockend = blocksize;
+			}
+		}
+
+		/* First block.  */
+		if (i == pos / blocksize)
+		{
+			skipfirst = blockoff;
+			blockend -= skipfirst;
+		}
+
+		/* If the block number is 0 this block is not stored on disk but
+		   is zero filled instead.  */
+		if (blknr)
+		{
+			int status;
+
+			status = ext2fs_devread (blknr, skipfirst, blockend, buf);
+			if (status == 0)
+			{
+				return(-1);
+			}
+		}
+		else
+		{
+			memset (buf, blocksize - skipfirst, 0);
+		}
+		buf += blocksize - skipfirst;
+        }
+	return(len);
+}
+
+
+static int ext2fs_iterate_dir
+(
+	ext2fs_node_t  dir,
+	char          *name,
+	ext2fs_node_t *fnode,
+	int           *ftype
+	)
+{
+	unsigned int fpos = 0;
+	int          status;
+	struct ext2fs_node *diro = (struct ext2fs_node *) dir;
+#ifdef DEBUG
+	if (name != NULL) printf("Iterate dir %s\n", name);
+#endif /* of DEBUG */
+	if (!diro->inode_read)
+        {
+		status = ext2fs_read_inode (diro->data, diro->ino, &diro->inode);
+		if (status == 0)
+		{
+			return(0);
+		}
+	}
+	/* Search the file.  */
+	while (fpos < __le32_to_cpu (diro->inode.size))
+        {
+		struct ext2_dirent dirent;
+
+		status = ext2fs_read_file (diro, fpos, sizeof (struct ext2_dirent), (char *) &dirent);
+		if (status < 1)
+		{
+			return(0);
+		}
+		if (dirent.namelen != 0)
+		{
+			char               filename[dirent.namelen + 1];
+			ext2fs_node_t      fdiro;
+			int                type = FILETYPE_UNKNOWN;
+
+			status = ext2fs_read_file (diro, fpos + sizeof (struct ext2_dirent), dirent.namelen, filename);
+			if (status < 1)
+			{
+				return(0);
+			}
+			fdiro = malloc (sizeof (struct ext2fs_node));
+			if (!fdiro)
+			{
+				return(0);
+			}
+
+			fdiro->data = diro->data;
+			fdiro->ino  =  __le32_to_cpu(dirent.inode);
+
+			filename[dirent.namelen] = '\0';
+
+			if (dirent.filetype != FILETYPE_UNKNOWN)
+			{
+				fdiro->inode_read = 0;
+
+				if (dirent.filetype == FILETYPE_DIRECTORY)
+				{
+					type = FILETYPE_DIRECTORY;
+				}
+				else if (dirent.filetype == FILETYPE_SYMLINK)
+				{
+					type = FILETYPE_SYMLINK;
+				}
+				else if (dirent.filetype == FILETYPE_REG)
+				{
+					type =  FILETYPE_REG;
+				}
+			}
+			else
+			{
+				/* The filetype can not be read from the dirent, get it from inode */
+
+				status = ext2fs_read_inode (diro->data, __le32_to_cpu (dirent.inode), &fdiro->inode);
+				if (status == 0)
+				{
+					free(fdiro);
+					return(0);
+				}
+				fdiro->inode_read = 1;
+
+				if ((__le16_to_cpu (fdiro->inode.mode) & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
+				{
+					type = FILETYPE_DIRECTORY;
+				}
+				else if ((__le16_to_cpu (fdiro->inode.mode) & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
+				{
+					type = FILETYPE_SYMLINK;
+				}
+				else if ((__le16_to_cpu (fdiro->inode.mode) & FILETYPE_INO_MASK) == FILETYPE_INO_REG)
+				{
+					type = FILETYPE_REG;
+				}
+			}
+#ifdef DEBUG
+			printf("iterate >%s<\n", filename);
+#endif /* of DEBUG */
+			if ((name != NULL) && (fnode != NULL) && (ftype != NULL))
+			{
+				if(strcmp(filename, name) == 0)
+				{
+					*ftype = type;
+					*fnode = fdiro;
+					return(1);
+				}
+			}
+			else
+			{
+				if (fdiro->inode_read == 0)
+				{
+					status = ext2fs_read_inode (diro->data, __le32_to_cpu (dirent.inode), &fdiro->inode);
+					if (status == 0)
+					{
+						free(fdiro);
+						return(0);
+					}
+					fdiro->inode_read = 1;
+				}
+				switch(type)
+				{
+				case FILETYPE_DIRECTORY:
+					printf("<DIR> ");
+					break;
+				case FILETYPE_SYMLINK:
+					printf("<SYM> ");
+					break;
+				case FILETYPE_REG:
+					printf("      ");
+					break;
+				default:
+					printf("<???> ");
+					break;
+				}
+				printf("%10d %s\n", __le32_to_cpu(fdiro->inode.size), filename);
+			}
+			free(fdiro);
+		}
+		fpos += __le16_to_cpu (dirent.direntlen);
+	}
+	return(0);
+}
+
+
+static char *ext2fs_read_symlink
+(
+	ext2fs_node_t node
+	)
+{
+	char               *symlink;
+	struct ext2fs_node *diro = node;
+	int                 status;
+
+	if (!diro->inode_read)
+        {
+		status = ext2fs_read_inode (diro->data, diro->ino, &diro->inode);
+		if (status == 0)
+		{
+			return(0);
+		}
+	}
+	symlink = malloc (__le32_to_cpu (diro->inode.size) + 1);
+	if (!symlink)
+        {
+		return(0);
+	}
+	/* If the filesize of the symlink is bigger than
+	   60 the symlink is stored in a separate block,
+	   otherwise it is stored in the inode.  */
+	if (__le32_to_cpu (diro->inode.size) <= 60)
+        {
+		strncpy (symlink, diro->inode.b.symlink, __le32_to_cpu (diro->inode.size));
+	}
+	else
+        {
+		status = ext2fs_read_file (diro, 0, __le32_to_cpu (diro->inode.size), symlink);
+		if (status == 0)
+		{
+			free (symlink);
+			return(0);
+		}
+	}
+	symlink[__le32_to_cpu (diro->inode.size)] = '\0';
+	return(symlink);
+}
+
+
+int ext2fs_find_file1
+(
+	const char    *currpath,
+	ext2fs_node_t  currroot,
+	ext2fs_node_t *currfound,
+	int           *foundtype
+	)
+{
+	char           fpath[strlen (currpath) + 1];
+	char          *name = fpath;
+	char          *next;
+	int            status;
+	int            type     = FILETYPE_DIRECTORY;
+	ext2fs_node_t  currnode = currroot;
+	ext2fs_node_t  oldnode  = currroot;
+
+	strncpy (fpath, currpath, strlen (currpath) + 1);
+
+	/* Remove all leading slashes.  */
+	while (*name == '/')
+        {
+		name++;
+        }
+	if (!*name)
+	{
+		*currfound = currnode;
+		return(1);
+	}
+
+	for (;;)
+	{
+		int found;
+
+		/* Extract the actual part from the pathname.  */
+		next = strchr (name, '/');
+		if (next)
+		{
+			/* Remove all leading slashes.  */
+			while (*next == '/')
+			{
+				*(next++) = '\0';
+			}
+		}
+
+		/* At this point it is expected that the current node is a directory, check if this is true.  */
+		if (type != FILETYPE_DIRECTORY)
+		{
+			ext2fs_free_node (currnode, currroot);
+			return(0);
+		}
+
+		oldnode = currnode;
+
+		/* Iterate over the directory.  */
+		found = ext2fs_iterate_dir (currnode, name, &currnode, &type);
+		if (found == 0)
+		{
+			return(0);
+		}
+		if (found == -1)
+		{
+			break;
+		}
+
+		/* Read in the symlink and follow it.  */
+		if (type == FILETYPE_SYMLINK)
+		{
+			char *symlink;
+
+			/* Test if the symlink does not loop.  */
+			if (++symlinknest == 8)
+			{
+				ext2fs_free_node (currnode, currroot);
+				ext2fs_free_node (oldnode,  currroot);
+				return(0);
+			}
+
+			symlink = ext2fs_read_symlink (currnode);
+			ext2fs_free_node (currnode, currroot);
+
+			if (!symlink)
+			{
+				ext2fs_free_node (oldnode, currroot);
+				return(0);
+			}
+#ifdef DEBUG
+			printf("Got symlink >%s<\n",symlink);
+#endif /* of DEBUG */
+			/* The symlink is an absolute path, go back to the root inode.  */
+			if (symlink[0] == '/')
+			{
+				ext2fs_free_node (oldnode, currroot);
+				oldnode = &ext2fs_root->diropen;
+			}
+
+			/* Lookup the node the symlink points to.  */
+			status = ext2fs_find_file1 (symlink, oldnode, &currnode, &type);
+
+			free (symlink);
+
+			if (status == 0)
+			{
+				ext2fs_free_node (oldnode, currroot);
+				return(0);
+			}
+		}
+
+		ext2fs_free_node (oldnode, currroot);
+
+		/* Found the node!  */
+		if (!next || *next == '\0')
+		{
+			*currfound = currnode;
+			*foundtype = type;
+			return(1);
+		}
+		name = next;
+	}
+	return(-1);
+}
+
+
+int ext2fs_find_file
+(
+	const char    *path,
+	ext2fs_node_t  rootnode,
+	ext2fs_node_t *foundnode,
+	int            expecttype
+	)
+{
+	int status;
+	int foundtype = FILETYPE_DIRECTORY;
+
+
+	symlinknest = 0;
+	if (!path || path[0] != '/')
+        {
+		return(0);
+	}
+
+	status = ext2fs_find_file1(path, rootnode, foundnode, &foundtype);
+	if (status == 0)
+        {
+		return(0);
+	}
+	/* Check if the node that was found was of the expected type.  */
+	if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
+        {
+		return(0);
+	}
+	else if ((expecttype == FILETYPE_DIRECTORY) && (foundtype != expecttype))
+        {
+		return(0);
+	}
+	return(1);
+}
+
+
+int ext2fs_ls
+(
+	char *dirname
+	)
+{
+	ext2fs_node_t dirnode;
+	int           status;
+
+	if (ext2fs_root == NULL)
+        {
+		return(0);
+	}
+
+	status = ext2fs_find_file(dirname, &ext2fs_root->diropen, &dirnode, FILETYPE_DIRECTORY);
+	if (status != 1)
+        {
+		printf("** Can not find directory. **\n");
+		return(1);
+        }
+	ext2fs_iterate_dir(dirnode, NULL, NULL, NULL);
+	ext2fs_free_node(dirnode, &ext2fs_root->diropen);
+	return(0);
+}
+
+
+int ext2fs_open
+(
+	char *filename
+	)
+{
+	ext2fs_node_t  fdiro = NULL;
+	int            status;
+	int            len;
+
+	if (ext2fs_root == NULL)
+        {
+		return(0);
+	}
+	ext2fs_file = NULL;
+	status      = ext2fs_find_file (filename, &ext2fs_root->diropen, &fdiro, FILETYPE_REG);
+	if (status == 0)
+        {
+		goto fail;
+	}
+	if (!fdiro->inode_read)
+        {
+		status = ext2fs_read_inode (fdiro->data, fdiro->ino, &fdiro->inode);
+		if (status == 0)
+		{
+			goto fail;
+		}
+	}
+	len = __le32_to_cpu (fdiro->inode.size);
+	ext2fs_file = fdiro;
+	return(len);
+
+ fail:
+	ext2fs_free_node(fdiro, &ext2fs_root->diropen);
+	return(0);
+}
+
+
+int ext2fs_close
+(
+	void
+	)
+{
+	if ((ext2fs_file != NULL) && (ext2fs_root != NULL))
+        {
+		ext2fs_free_node(ext2fs_file, &ext2fs_root->diropen);
+		ext2fs_file = NULL;
+	}
+	if (ext2fs_root != NULL)
+	{
+		free(ext2fs_root);
+		ext2fs_root  = NULL;
+	}
+	if (indir1_block != NULL)
+        {
+		free(indir1_block);
+		indir1_block =  NULL;
+		indir1_size  =  0;
+		indir1_blkno =  -1;
+	}
+	if (indir2_block != NULL)
+        {
+		free(indir2_block);
+		indir2_block =  NULL;
+		indir2_size  =  0;
+		indir2_blkno =  -1;
+	}
+	return(0);
+}
+
+
+int ext2fs_read
+(
+	char     *buf,
+	unsigned  len
+	)
+{
+	int status;
+
+	if (ext2fs_root == NULL)
+        {
+		return(0);
+	}
+
+	if (ext2fs_file == NULL)
+        {
+		return(0);
+	}
+
+	status = ext2fs_read_file(ext2fs_file, 0, len, buf);
+	return(status);
+}
+
+
+int ext2fs_mount
+(
+	unsigned part_length
+	)
+{
+	struct ext2_data *data;
+	int               status;
+
+	data = malloc (sizeof (struct ext2_data));
+	if (!data)
+        {
+		return(0);
+	}
+	/* Read the superblock.  */
+	status = ext2fs_devread (1 * 2, 0, sizeof (struct ext2_sblock), (char *) &data->sblock);
+	if (status == 0)
+        {
+		goto fail;
+	}
+	/* Make sure this is an ext2 filesystem.  */
+	if (__le16_to_cpu (data->sblock.magic) != EXT2_MAGIC)
+        {
+		goto fail;
+	}
+	data->diropen.data       =  data;
+	data->diropen.ino        =  2;
+	data->diropen.inode_read =  1;
+	data->inode              = &data->diropen.inode;
+
+	status = ext2fs_read_inode (data, 2, data->inode);
+	if (status == 0)
+        {
+		goto fail;
+	}
+
+	ext2fs_root = data;
+
+	return(1);
+
+ fail:
+	printf("Failed to mount ext2 filesystem...\n");
+	free(data);
+	ext2fs_root = NULL;
+	return(0);
+}
+
+#endif /* CFG_CMD_EXT2FS */