diff options
Diffstat (limited to 'e2fslib/openfs.c')
| -rw-r--r-- | e2fslib/openfs.c | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/e2fslib/openfs.c b/e2fslib/openfs.c deleted file mode 100644 index 042e25a..0000000 --- a/e2fslib/openfs.c +++ /dev/null @@ -1,240 +0,0 @@ -/* - * openfs.c --- open an ext2 filesystem - * - * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. - * - * %Begin-Header% - * This file may be redistributed under the terms of the GNU Public - * License. - * %End-Header% - */ - -#include <stdio.h> -#include <string.h> -#if HAVE_UNISTD_H -#include <unistd.h> -#endif -#include <fcntl.h> -#include <time.h> -#if HAVE_SYS_STAT_H -#include <sys/stat.h> -#endif -#if HAVE_SYS_TYPES_H -#include <sys/types.h> -#endif - -#include "ext2_fs.h" -#include "ext2fs.h" -#include "e2image.h" - -/* - * Note: if superblock is non-zero, block-size must also be non-zero. - * Superblock and block_size can be zero to use the default size. - * - * Valid flags for ext2fs_open() - * - * EXT2_FLAG_RW - Open the filesystem for read/write. - * EXT2_FLAG_FORCE - Open the filesystem even if some of the - * features aren't supported. - * EXT2_FLAG_JOURNAL_DEV_OK - Open an ext3 journal device - */ -errcode_t ext2fs_open(const char *name, int flags, int superblock, - int block_size, io_manager manager, ext2_filsys *ret_fs) -{ - ext2_filsys fs; - errcode_t retval; - int i, j, groups_per_block; - blk_t group_block; - char *dest; - struct ext2_group_desc *gdp; - - EXT2_CHECK_MAGIC(manager, EXT2_ET_MAGIC_IO_MANAGER); - - retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), - (void **) &fs); - if (retval) - return retval; - - memset(fs, 0, sizeof(struct struct_ext2_filsys)); - fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS; - fs->flags = flags; - retval = manager->open(name, (flags & EXT2_FLAG_RW) ? IO_FLAG_RW : 0, - &fs->io); - if (retval) - goto cleanup; - fs->io->app_data = fs; - retval = ext2fs_get_mem(strlen(name)+1, (void **) &fs->device_name); - if (retval) - goto cleanup; - strcpy(fs->device_name, name); - retval = ext2fs_get_mem(SUPERBLOCK_SIZE, (void **) &fs->super); - if (retval) - goto cleanup; - if (flags & EXT2_FLAG_IMAGE_FILE) { - retval = ext2fs_get_mem(sizeof(struct ext2_image_hdr), - (void **) &fs->image_header); - if (retval) - goto cleanup; - retval = io_channel_read_blk(fs->io, 0, - -sizeof(struct ext2_image_hdr), - fs->image_header); - if (retval) - goto cleanup; - if (fs->image_header->magic_number != EXT2_ET_MAGIC_E2IMAGE) - return EXT2_ET_MAGIC_E2IMAGE; - superblock = 1; - block_size = fs->image_header->fs_blocksize; - } - - /* - * If the user specifies a specific block # for the - * superblock, then he/she must also specify the block size! - * Otherwise, read the master superblock located at offset - * SUPERBLOCK_OFFSET from the start of the partition. - * - * Note: we only save a backup copy of the superblock if we - * are reading the superblock from the primary superblock location. - */ - if (superblock) { - if (!block_size) { - retval = EXT2_ET_INVALID_ARGUMENT; - goto cleanup; - } - io_channel_set_blksize(fs->io, block_size); - group_block = superblock + 1; - fs->orig_super = 0; - } else { - io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET); - superblock = 1; - group_block = 0; - retval = ext2fs_get_mem(SUPERBLOCK_SIZE, - (void **) &fs->orig_super); - if (retval) - goto cleanup; - } - retval = io_channel_read_blk(fs->io, superblock, -SUPERBLOCK_SIZE, - fs->super); - if (retval) - goto cleanup; - if (fs->orig_super) - memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE); - -#ifdef EXT2FS_ENABLE_SWAPFS - if ((fs->super->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) || - (fs->flags & EXT2_FLAG_SWAP_BYTES)) { - fs->flags |= EXT2_FLAG_SWAP_BYTES; - - ext2fs_swap_super(fs->super); - } -#endif - - if (fs->super->s_magic != EXT2_SUPER_MAGIC) { - printf("%x, %x\n",fs->super->s_magic, EXT2_SUPER_MAGIC); - retval = EXT2_ET_BAD_MAGIC; - goto cleanup; - } - if (fs->super->s_rev_level > EXT2_LIB_CURRENT_REV) { - retval = EXT2_ET_REV_TOO_HIGH; - goto cleanup; - } - - /* - * Check for feature set incompatibility - */ - if (!(flags & EXT2_FLAG_FORCE)) { - if (fs->super->s_feature_incompat & - ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) { - retval = EXT2_ET_UNSUPP_FEATURE; - goto cleanup; - } - if ((flags & EXT2_FLAG_RW) && - (fs->super->s_feature_ro_compat & - ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)) { - retval = EXT2_ET_RO_UNSUPP_FEATURE; - goto cleanup; - } - if (!(flags & EXT2_FLAG_JOURNAL_DEV_OK) && - (fs->super->s_feature_incompat & - EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { - retval = EXT2_ET_UNSUPP_FEATURE; - goto cleanup; - } - } - - fs->blocksize = EXT2_BLOCK_SIZE(fs->super); - if (fs->blocksize == 0) { - retval = EXT2_ET_CORRUPT_SUPERBLOCK; - goto cleanup; - } - fs->fragsize = EXT2_FRAG_SIZE(fs->super); - fs->inode_blocks_per_group = ((fs->super->s_inodes_per_group * - EXT2_INODE_SIZE(fs->super) + - EXT2_BLOCK_SIZE(fs->super) - 1) / - EXT2_BLOCK_SIZE(fs->super)); - if (block_size) { - if (block_size != fs->blocksize) { - retval = EXT2_ET_UNEXPECTED_BLOCK_SIZE; - goto cleanup; - } - } - /* - * Set the blocksize to the filesystem's blocksize. - */ - io_channel_set_blksize(fs->io, fs->blocksize); - - /* - * If this is an external journal device, don't try to read - * the group descriptors, because they're not there. - */ - if (fs->super->s_feature_incompat & - EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { - fs->group_desc_count = 0; - *ret_fs = fs; - return 0; - } - - /* - * Read group descriptors - */ - if ((EXT2_BLOCKS_PER_GROUP(fs->super)) == 0) { - retval = EXT2_ET_CORRUPT_SUPERBLOCK; - goto cleanup; - } - fs->group_desc_count = (fs->super->s_blocks_count - - fs->super->s_first_data_block + - EXT2_BLOCKS_PER_GROUP(fs->super) - 1) - / EXT2_BLOCKS_PER_GROUP(fs->super); - fs->desc_blocks = (fs->group_desc_count + - EXT2_DESC_PER_BLOCK(fs->super) - 1) - / EXT2_DESC_PER_BLOCK(fs->super); - retval = ext2fs_get_mem(fs->desc_blocks * fs->blocksize, - (void **) &fs->group_desc); - if (retval) - goto cleanup; - if (!group_block) - group_block = fs->super->s_first_data_block + 1; - dest = (char *) fs->group_desc; - for (i=0 ; i < fs->desc_blocks; i++) { - retval = io_channel_read_blk(fs->io, group_block, 1, dest); - if (retval) - goto cleanup; - group_block++; -#ifdef EXT2FS_ENABLE_SWAPFS - if (fs->flags & EXT2_FLAG_SWAP_BYTES) { - gdp = (struct ext2_group_desc *) dest; - groups_per_block = fs->blocksize / - sizeof(struct ext2_group_desc); - for (j=0; j < groups_per_block; j++) - ext2fs_swap_group_desc(gdp++); - } -#endif - dest += fs->blocksize; - } - - *ret_fs = fs; - return 0; -cleanup: - ext2fs_free(fs); - return retval; -} - |