diff options
author | Uma Shankar <uma.shankar@samsung.com> | 2012-05-25 21:21:44 +0530 |
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committer | Wolfgang Denk <wd@denx.de> | 2012-08-09 23:47:43 +0200 |
commit | a1596438a68921d2c9b1fdec70a720d38c85ca7d (patch) | |
tree | 41abe5c16734aae38d1ebd130103bc83d8d5180c /fs/ext4/ext4_common.c | |
parent | 4d3c95f5ea7c737a21cd6b9c59435ee693b3f127 (diff) |
ext4fs ls load support
Signed-off-by: Uma Shankar <uma.shankar@samsung.com>
Signed-off-by: Manjunatha C Achar <a.manjunatha@samsung.com>
Signed-off-by: Iqbal Shareef <iqbal.ams@samsung.com>
Signed-off-by: Hakgoo Lee <goodguy.lee@samsung.com>
Diffstat (limited to 'fs/ext4/ext4_common.c')
-rw-r--r-- | fs/ext4/ext4_common.c | 875 |
1 files changed, 875 insertions, 0 deletions
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c new file mode 100644 index 00000000000..2ddbb50e890 --- /dev/null +++ b/fs/ext4/ext4_common.c @@ -0,0 +1,875 @@ +/* + * (C) Copyright 2011 - 2012 Samsung Electronics + * EXT4 filesystem implementation in Uboot by + * Uma Shankar <uma.shankar@samsung.com> + * Manjunatha C Achar <a.manjunatha@samsung.com> + * + * ext4ls and ext4load : Based on ext2 ls load support in Uboot. + * + * (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 <ext_common.h> +#include <ext4fs.h> +#include <malloc.h> +#include <stddef.h> +#include <linux/stat.h> +#include <linux/time.h> +#include <asm/byteorder.h> +#include "ext4_common.h" + +struct ext2_data *ext4fs_root; +struct ext2fs_node *ext4fs_file; +uint32_t *ext4fs_indir1_block; +int ext4fs_indir1_size; +int ext4fs_indir1_blkno = -1; +uint32_t *ext4fs_indir2_block; +int ext4fs_indir2_size; +int ext4fs_indir2_blkno = -1; + +uint32_t *ext4fs_indir3_block; +int ext4fs_indir3_size; +int ext4fs_indir3_blkno = -1; +struct ext2_inode *g_parent_inode; +static int symlinknest; + +static struct ext4_extent_header *ext4fs_get_extent_block + (struct ext2_data *data, char *buf, + struct ext4_extent_header *ext_block, + uint32_t fileblock, int log2_blksz) +{ + struct ext4_extent_idx *index; + unsigned long long block; + struct ext_filesystem *fs = get_fs(); + int i; + + while (1) { + index = (struct ext4_extent_idx *)(ext_block + 1); + + if (le32_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) + return 0; + + if (ext_block->eh_depth == 0) + return ext_block; + i = -1; + do { + i++; + if (i >= le32_to_cpu(ext_block->eh_entries)) + break; + } while (fileblock > le32_to_cpu(index[i].ei_block)); + + if (--i < 0) + return 0; + + block = le32_to_cpu(index[i].ei_leaf_hi); + block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); + + if (ext4fs_devread(block << log2_blksz, 0, fs->blksz, buf)) + ext_block = (struct ext4_extent_header *)buf; + else + return 0; + } +} + +static int ext4fs_blockgroup + (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) +{ + long int blkno; + unsigned int blkoff, 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); + + debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", + group, blkno, blkoff); + + return ext4fs_devread(blkno << LOG2_EXT2_BLOCK_SIZE(data), + blkoff, sizeof(struct ext2_block_group), + (char *)blkgrp); +} + +int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) +{ + struct ext2_block_group blkgrp; + struct ext2_sblock *sblock = &data->sblock; + struct ext_filesystem *fs = get_fs(); + int inodes_per_block, status; + long int blkno; + unsigned int blkoff; + + /* It is easier to calculate if the first inode is 0. */ + ino--; + status = ext4fs_blockgroup(data, ino / __le32_to_cpu + (sblock->inodes_per_group), &blkgrp); + if (status == 0) + return 0; + + inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; + blkno = __le32_to_cpu(blkgrp.inode_table_id) + + (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; + blkoff = (ino % inodes_per_block) * fs->inodesz; + /* Read the inode. */ + status = ext4fs_devread(blkno << LOG2_EXT2_BLOCK_SIZE(data), blkoff, + sizeof(struct ext2_inode), (char *)inode); + if (status == 0) + return 0; + + return 1; +} + +long int read_allocated_block(struct ext2_inode *inode, int fileblock) +{ + long int blknr; + int blksz; + int log2_blksz; + int status; + long int rblock; + long int perblock_parent; + long int perblock_child; + unsigned long long start; + /* get the blocksize of the filesystem */ + blksz = EXT2_BLOCK_SIZE(ext4fs_root); + log2_blksz = LOG2_EXT2_BLOCK_SIZE(ext4fs_root); + if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { + char *buf = zalloc(blksz); + if (!buf) + return -ENOMEM; + struct ext4_extent_header *ext_block; + struct ext4_extent *extent; + int i = -1; + ext_block = ext4fs_get_extent_block(ext4fs_root, buf, + (struct ext4_extent_header + *)inode->b. + blocks.dir_blocks, + fileblock, log2_blksz); + if (!ext_block) { + printf("invalid extent block\n"); + free(buf); + return -EINVAL; + } + + extent = (struct ext4_extent *)(ext_block + 1); + + do { + i++; + if (i >= le32_to_cpu(ext_block->eh_entries)) + break; + } while (fileblock >= le32_to_cpu(extent[i].ee_block)); + if (--i >= 0) { + fileblock -= le32_to_cpu(extent[i].ee_block); + if (fileblock >= le32_to_cpu(extent[i].ee_len)) { + free(buf); + return 0; + } + + start = le32_to_cpu(extent[i].ee_start_hi); + start = (start << 32) + + le32_to_cpu(extent[i].ee_start_lo); + free(buf); + return fileblock + start; + } + + printf("Extent Error\n"); + free(buf); + return -1; + } + + /* 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 (ext4fs_indir1_block == NULL) { + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** SI ext2fs read block (indir 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + ext4fs_indir1_blkno = -1; + } + if (blksz != ext4fs_indir1_size) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** SI ext2fs read block (indir 1):" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + } + if ((__le32_to_cpu(inode->b.blocks.indir_block) << + log2_blksz) != ext4fs_indir1_blkno) { + status = + ext4fs_devread(__le32_to_cpu + (inode->b.blocks. + indir_block) << log2_blksz, 0, + blksz, (char *)ext4fs_indir1_block); + if (status == 0) { + printf("** SI ext2fs read block (indir 1)" + "failed. **\n"); + return 0; + } + ext4fs_indir1_blkno = + __le32_to_cpu(inode->b.blocks. + indir_block) << log2_blksz; + } + blknr = __le32_to_cpu(ext4fs_indir1_block + [fileblock - INDIRECT_BLOCKS]); + } + /* Double indirect. */ + else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * + (blksz / 4 + 1)))) { + + long int perblock = blksz / 4; + long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); + + if (ext4fs_indir1_block == NULL) { + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** DI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + ext4fs_indir1_blkno = -1; + } + if (blksz != ext4fs_indir1_size) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** DI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + } + if ((__le32_to_cpu(inode->b.blocks.double_indir_block) << + log2_blksz) != ext4fs_indir1_blkno) { + status = + ext4fs_devread(__le32_to_cpu + (inode->b.blocks. + double_indir_block) << log2_blksz, + 0, blksz, + (char *)ext4fs_indir1_block); + if (status == 0) { + printf("** DI ext2fs read block (indir 2 1)" + "failed. **\n"); + return -1; + } + ext4fs_indir1_blkno = + __le32_to_cpu(inode->b.blocks.double_indir_block) << + log2_blksz; + } + + if (ext4fs_indir2_block == NULL) { + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** DI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + ext4fs_indir2_blkno = -1; + } + if (blksz != ext4fs_indir2_size) { + free(ext4fs_indir2_block); + ext4fs_indir2_block = NULL; + ext4fs_indir2_size = 0; + ext4fs_indir2_blkno = -1; + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** DI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + } + if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << + log2_blksz) != ext4fs_indir2_blkno) { + status = ext4fs_devread(__le32_to_cpu + (ext4fs_indir1_block + [rblock / + perblock]) << log2_blksz, 0, + blksz, + (char *)ext4fs_indir2_block); + if (status == 0) { + printf("** DI ext2fs read block (indir 2 2)" + "failed. **\n"); + return -1; + } + ext4fs_indir2_blkno = + __le32_to_cpu(ext4fs_indir1_block[rblock + / + perblock]) << + log2_blksz; + } + blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); + } + /* Tripple indirect. */ + else { + rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + + (blksz / 4 * blksz / 4)); + perblock_child = blksz / 4; + perblock_parent = ((blksz / 4) * (blksz / 4)); + + if (ext4fs_indir1_block == NULL) { + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** TI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + ext4fs_indir1_blkno = -1; + } + if (blksz != ext4fs_indir1_size) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** TI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + } + if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) << + log2_blksz) != ext4fs_indir1_blkno) { + status = ext4fs_devread + (__le32_to_cpu(inode->b.blocks.triple_indir_block) + << log2_blksz, 0, blksz, + (char *)ext4fs_indir1_block); + if (status == 0) { + printf("** TI ext2fs read block (indir 2 1)" + "failed. **\n"); + return -1; + } + ext4fs_indir1_blkno = + __le32_to_cpu(inode->b.blocks.triple_indir_block) << + log2_blksz; + } + + if (ext4fs_indir2_block == NULL) { + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + ext4fs_indir2_blkno = -1; + } + if (blksz != ext4fs_indir2_size) { + free(ext4fs_indir2_block); + ext4fs_indir2_block = NULL; + ext4fs_indir2_size = 0; + ext4fs_indir2_blkno = -1; + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + } + if ((__le32_to_cpu(ext4fs_indir1_block[rblock / + perblock_parent]) << + log2_blksz) + != ext4fs_indir2_blkno) { + status = ext4fs_devread(__le32_to_cpu + (ext4fs_indir1_block + [rblock / + perblock_parent]) << + log2_blksz, 0, blksz, + (char *)ext4fs_indir2_block); + if (status == 0) { + printf("** TI ext2fs read block (indir 2 2)" + "failed. **\n"); + return -1; + } + ext4fs_indir2_blkno = + __le32_to_cpu(ext4fs_indir1_block[rblock / + perblock_parent]) + << log2_blksz; + } + + if (ext4fs_indir3_block == NULL) { + ext4fs_indir3_block = zalloc(blksz); + if (ext4fs_indir3_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir3_size = blksz; + ext4fs_indir3_blkno = -1; + } + if (blksz != ext4fs_indir3_size) { + free(ext4fs_indir3_block); + ext4fs_indir3_block = NULL; + ext4fs_indir3_size = 0; + ext4fs_indir3_blkno = -1; + ext4fs_indir3_block = zalloc(blksz); + if (ext4fs_indir3_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir3_size = blksz; + } + if ((__le32_to_cpu(ext4fs_indir2_block[rblock + / + perblock_child]) << + log2_blksz) != ext4fs_indir3_blkno) { + status = + ext4fs_devread(__le32_to_cpu + (ext4fs_indir2_block + [(rblock / perblock_child) + % (blksz / 4)]) << log2_blksz, 0, + blksz, (char *)ext4fs_indir3_block); + if (status == 0) { + printf("** TI ext2fs read block (indir 2 2)" + "failed. **\n"); + return -1; + } + ext4fs_indir3_blkno = + __le32_to_cpu(ext4fs_indir2_block[(rblock / + perblock_child) % + (blksz / + 4)]) << + log2_blksz; + } + + blknr = __le32_to_cpu(ext4fs_indir3_block + [rblock % perblock_child]); + } + debug("ext4fs_read_block %ld\n", blknr); + + return blknr; +} + +void ext4fs_close(void) +{ + if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { + ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); + ext4fs_file = NULL; + } + if (ext4fs_root != NULL) { + free(ext4fs_root); + ext4fs_root = NULL; + } + if (ext4fs_indir1_block != NULL) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + } + if (ext4fs_indir2_block != NULL) { + free(ext4fs_indir2_block); + ext4fs_indir2_block = NULL; + ext4fs_indir2_size = 0; + ext4fs_indir2_blkno = -1; + } + if (ext4fs_indir3_block != NULL) { + free(ext4fs_indir3_block); + ext4fs_indir3_block = NULL; + ext4fs_indir3_size = 0; + ext4fs_indir3_blkno = -1; + } +} + +int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, + struct ext2fs_node **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 = ext4fs_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 = ext4fs_read_file(diro, fpos, + sizeof(struct ext2_dirent), + (char *) &dirent); + if (status < 1) + return 0; + + if (dirent.namelen != 0) { + char filename[dirent.namelen + 1]; + struct ext2fs_node *fdiro; + int type = FILETYPE_UNKNOWN; + + status = ext4fs_read_file(diro, + fpos + + sizeof(struct ext2_dirent), + dirent.namelen, filename); + if (status < 1) + return 0; + + fdiro = zalloc(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 { + status = ext4fs_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 = ext4fs_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 *ext4fs_read_symlink(struct ext2fs_node *node) +{ + char *symlink; + struct ext2fs_node *diro = node; + int status; + + if (!diro->inode_read) { + status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); + if (status == 0) + return 0; + } + symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1); + if (!symlink) + return 0; + + if (__le32_to_cpu(diro->inode.size) <= 60) { + strncpy(symlink, diro->inode.b.symlink, + __le32_to_cpu(diro->inode.size)); + } else { + status = ext4fs_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; +} + +static int ext4fs_find_file1(const char *currpath, + struct ext2fs_node *currroot, + struct ext2fs_node **currfound, int *foundtype) +{ + char fpath[strlen(currpath) + 1]; + char *name = fpath; + char *next; + int status; + int type = FILETYPE_DIRECTORY; + struct ext2fs_node *currnode = currroot; + struct ext2fs_node *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'; + } + + if (type != FILETYPE_DIRECTORY) { + ext4fs_free_node(currnode, currroot); + return 0; + } + + oldnode = currnode; + + /* Iterate over the directory. */ + found = ext4fs_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) { + ext4fs_free_node(currnode, currroot); + ext4fs_free_node(oldnode, currroot); + return 0; + } + + symlink = ext4fs_read_symlink(currnode); + ext4fs_free_node(currnode, currroot); + + if (!symlink) { + ext4fs_free_node(oldnode, currroot); + return 0; + } + + debug("Got symlink >%s<\n", symlink); + + if (symlink[0] == '/') { + ext4fs_free_node(oldnode, currroot); + oldnode = &ext4fs_root->diropen; + } + + /* Lookup the node the symlink points to. */ + status = ext4fs_find_file1(symlink, oldnode, + &currnode, &type); + + free(symlink); + + if (status == 0) { + ext4fs_free_node(oldnode, currroot); + return 0; + } + } + + ext4fs_free_node(oldnode, currroot); + + /* Found the node! */ + if (!next || *next == '\0') { + *currfound = currnode; + *foundtype = type; + return 1; + } + name = next; + } + return -1; +} + +int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, + struct ext2fs_node **foundnode, int expecttype) +{ + int status; + int foundtype = FILETYPE_DIRECTORY; + + symlinknest = 0; + if (!path) + return 0; + + status = ext4fs_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 ext4fs_open(const char *filename) +{ + struct ext2fs_node *fdiro = NULL; + int status; + int len; + + if (ext4fs_root == NULL) + return -1; + + ext4fs_file = NULL; + status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, + FILETYPE_REG); + if (status == 0) + goto fail; + + if (!fdiro->inode_read) { + status = ext4fs_read_inode(fdiro->data, fdiro->ino, + &fdiro->inode); + if (status == 0) + goto fail; + } + len = __le32_to_cpu(fdiro->inode.size); + ext4fs_file = fdiro; + + return len; +fail: + ext4fs_free_node(fdiro, &ext4fs_root->diropen); + + return -1; +} + +int ext4fs_mount(unsigned part_length) +{ + struct ext2_data *data; + int status; + struct ext_filesystem *fs = get_fs(); + data = zalloc(sizeof(struct ext2_data)); + if (!data) + return 0; + + /* Read the superblock. */ + status = ext4fs_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)) + fs->inodesz = 128; + else + fs->inodesz = __le16_to_cpu(data->sblock.inode_size); + + debug("EXT2 rev %d, inode_size %d\n", + __le32_to_cpu(data->sblock.revision_level), fs->inodesz); + + data->diropen.data = data; + data->diropen.ino = 2; + data->diropen.inode_read = 1; + data->inode = &data->diropen.inode; + + status = ext4fs_read_inode(data, 2, data->inode); + if (status == 0) + goto fail; + + ext4fs_root = data; + + return 1; +fail: + printf("Failed to mount ext2 filesystem...\n"); + free(data); + ext4fs_root = NULL; + + return 0; +} |