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-rw-r--r--u-boot/fs/ext2/ext2fs.c891
1 files changed, 891 insertions, 0 deletions
diff --git a/u-boot/fs/ext2/ext2fs.c b/u-boot/fs/ext2/ext2fs.c
new file mode 100644
index 0000000..e119e13
--- /dev/null
+++ b/u-boot/fs/ext2/ext2fs.c
@@ -0,0 +1,891 @@
+/*
+ * (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 *) 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) != 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);
+ }
+ 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, 0, blocksize - skipfirst);
+ }
+ 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) {
+ 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 2024-05-23 02:57:33 +0000