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-rw-r--r--fs/ext2/ext2fs.c919
1 files changed, 0 insertions, 919 deletions
diff --git a/fs/ext2/ext2fs.c b/fs/ext2/ext2fs.c
deleted file mode 100644
index 418404e..0000000
--- a/fs/ext2/ext2fs.c
+++ /dev/null
@@ -1,919 +0,0 @@
-/*
- * (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>
-#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 used_dir_cnt;
- 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 unsigned int inode_size;
-
-
-static int ext2fs_blockgroup
- (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) {
- unsigned int blkno;
- unsigned int blkoff;
- unsigned int desc_per_blk;
-
- desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
-
- blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
- group / desc_per_blk;
- blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
-#ifdef DEBUG
- printf ("ext2fs read %d group descriptor (blkno %d blkoff %d)\n",
- group, blkno, blkoff);
-#endif
- return (ext2fs_devread (blkno << LOG2_EXT2_BLOCK_SIZE(data),
- blkoff, 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;
-
-#ifdef DEBUG
- printf ("ext2fs read inode %d, inode_size %d\n", ino, inode_size);
-#endif
- /* It is easier to calculate if the first inode is 0. */
- ino--;
- 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) / inode_size;
-
- blkno = __le32_to_cpu (blkgrp.inode_table_id) +
- (ino % __le32_to_cpu (sblock->inodes_per_group))
- / inodes_per_block;
- blkoff = (ino % inodes_per_block) * inode_size;
-#ifdef DEBUG
- printf ("ext2fs read inode blkno %d blkoff %d\n", blkno, blkoff);
-#endif
- /* Read the inode. */
- status = ext2fs_devread (blkno << LOG2_EXT2_BLOCK_SIZE (data), 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 *) memalign(ARCH_DMA_MINALIGN,
- 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 *) memalign(ARCH_DMA_MINALIGN,
- 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 *) memalign(ARCH_DMA_MINALIGN,
- 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 *) memalign(ARCH_DMA_MINALIGN,
- 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 *) memalign(ARCH_DMA_MINALIGN,
- 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 *) memalign(ARCH_DMA_MINALIGN,
- 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) != indir2_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 = __le32_to_cpu(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);
- }
-
- /* 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;
- }
-
- /* grab middle blocks in one go */
- if (i != pos / blocksize && i < blockcnt - 1 && blockcnt > 3) {
- int oldblk = blknr;
- int blocknxt = ext2fs_read_block(node, i + 1);
- while (i < blockcnt - 1) {
- if (blocknxt == (oldblk + 1)) {
- oldblk = blocknxt;
- i++;
- } else {
- blocknxt = ext2fs_read_block(node, i);
- break;
- }
- blocknxt = ext2fs_read_block(node, i);
- }
-
- if (oldblk == blknr)
- blockend = blocksize;
- else
- blockend = (1 + blocknxt - blknr) * blocksize;
- }
-
- blknr = blknr << log2blocksize;
-
- /* 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, 0, blocksize - skipfirst);
- }
- buf += blockend - 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) {
- 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 (const 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 (const char *filename) {
- ext2fs_node_t fdiro = NULL;
- int status;
- int len;
-
- if (ext2fs_root == NULL) {
- return (-1);
- }
- 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 (-1);
-}
-
-
-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;
- }
- if (__le32_to_cpu(data->sblock.revision_level == 0)) {
- inode_size = 128;
- } else {
- inode_size = __le16_to_cpu(data->sblock.inode_size);
- }
-#ifdef DEBUG
- printf("EXT2 rev %d, inode_size %d\n",
- __le32_to_cpu(data->sblock.revision_level), inode_size);
-#endif
- 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);
-}
generated by cgit v1.1 at 2024-11-23 05:46:17 +0000