/* * swapfs.c --- swap ext2 filesystem data structures * * Copyright (C) 1995, 1996, 2002 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Library * General Public License, version 2. * %End-Header% */ #include "config.h" #include #if HAVE_UNISTD_H #include #endif #include #include #include "ext2_fs.h" #include "ext2fs.h" #include "ext2fsP.h" #include void ext2fs_swap_super(struct ext2_super_block * sb) { int i; sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); sb->s_log_cluster_size = ext2fs_swab32(sb->s_log_cluster_size); sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); sb->s_clusters_per_group = ext2fs_swab32(sb->s_clusters_per_group); sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); sb->s_mtime = ext2fs_swab32(sb->s_mtime); sb->s_wtime = ext2fs_swab32(sb->s_wtime); sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); sb->s_magic = ext2fs_swab16(sb->s_magic); sb->s_state = ext2fs_swab16(sb->s_state); sb->s_errors = ext2fs_swab16(sb->s_errors); sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); /* sb->s_uuid is __u8 and does not need swabbing */ /* sb->s_volume_name is char and does not need swabbing */ /* sb->s_last_mounted is char and does not need swabbing */ sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); /* sb->s_prealloc_blocks is __u8 and does not need swabbing */ /* sb->s_prealloc_dir_blocks is __u8 and does not need swabbing */ sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); /* sb->s_journal_uuid is __u8 and does not need swabbing */ sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); for (i = 0; i < 4; i++) sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); /* sb->s_def_hash_version is __u8 and does not need swabbing */ /* sb->s_jnl_backup_type is __u8 and does not need swabbing */ sb->s_desc_size = ext2fs_swab16(sb->s_desc_size); sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); /* if journal backup is for a valid extent-based journal... */ if (ext2fs_extent_header_verify(sb->s_jnl_blocks, sizeof(sb->s_jnl_blocks)) == 0) { /* ... swap only the journal i_size and i_size_high, * and the extent data is not swapped on read */ i = 15; } else { /* direct/indirect journal: swap it all */ i = 0; } for (; i < 17; i++) sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi); sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi); sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi); sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize); sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize); sb->s_flags = ext2fs_swab32(sb->s_flags); sb->s_raid_stride = ext2fs_swab16(sb->s_raid_stride); sb->s_mmp_update_interval = ext2fs_swab16(sb->s_mmp_update_interval); sb->s_mmp_block = ext2fs_swab64(sb->s_mmp_block); sb->s_raid_stripe_width = ext2fs_swab32(sb->s_raid_stripe_width); /* sb->s_log_groups_per_flex is __u8 and does not need swabbing */ /* sb->s_checksum_type is __u8 and does not need swabbing */ /* sb->s_encryption_level is __u8 and does not need swabbing */ /* sb->s_reserved_pad is __u8 and does not need swabbing */ sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written); sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum); sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id); sb->s_snapshot_r_blocks_count = ext2fs_swab64(sb->s_snapshot_r_blocks_count); sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list); sb->s_error_count = ext2fs_swab32(sb->s_error_count); sb->s_first_error_time = ext2fs_swab32(sb->s_first_error_time); sb->s_first_error_ino = ext2fs_swab32(sb->s_first_error_ino); sb->s_first_error_block = ext2fs_swab64(sb->s_first_error_block); /* sb->s_first_error_func is __u8 and does not need swabbing */ sb->s_last_error_time = ext2fs_swab32(sb->s_last_error_time); sb->s_last_error_ino = ext2fs_swab32(sb->s_last_error_ino); sb->s_last_error_block = ext2fs_swab64(sb->s_last_error_block); /* sb->s_last_error_func is __u8 and does not need swabbing */ /* sb->s_mount_opts is __u8 and does not need swabbing */ sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum); sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum); sb->s_overhead_clusters = ext2fs_swab32(sb->s_overhead_clusters); sb->s_backup_bgs[0] = ext2fs_swab32(sb->s_backup_bgs[0]); sb->s_backup_bgs[1] = ext2fs_swab32(sb->s_backup_bgs[1]); /* sb->s_encrypt_algos is __u8 and does not need swabbing */ /* sb->s_encrypt_pw_salt is __u8 and does not need swabbing */ sb->s_lpf_ino = ext2fs_swab32(sb->s_lpf_ino); sb->s_prj_quota_inum = ext2fs_swab32(sb->s_prj_quota_inum); sb->s_checksum_seed = ext2fs_swab32(sb->s_checksum_seed); /* s_*_time_hi are __u8 and does not need swabbing */ sb->s_encoding = ext2fs_swab16(sb->s_encoding); sb->s_encoding_flags = ext2fs_swab16(sb->s_encoding_flags); sb->s_orphan_file_inum = ext2fs_swab32(sb->s_orphan_file_inum); /* catch when new fields are used from s_reserved */ EXT2FS_BUILD_BUG_ON(sizeof(sb->s_reserved) != 94 * sizeof(__le32)); sb->s_checksum = ext2fs_swab32(sb->s_checksum); } void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp) { struct ext4_group_desc *gdp4 = (struct ext4_group_desc *)gdp; /* Do the 32-bit parts first */ gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); gdp->bg_flags = ext2fs_swab16(gdp->bg_flags); gdp->bg_exclude_bitmap_lo = ext2fs_swab32(gdp->bg_exclude_bitmap_lo); gdp->bg_block_bitmap_csum_lo = ext2fs_swab16(gdp->bg_block_bitmap_csum_lo); gdp->bg_inode_bitmap_csum_lo = ext2fs_swab16(gdp->bg_inode_bitmap_csum_lo); gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused); gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum); /* If we're 32-bit, we're done */ if (fs == NULL || EXT2_DESC_SIZE(fs->super) < EXT2_MIN_DESC_SIZE_64BIT) return; /* Swap the 64-bit parts */ gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi); gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi); gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi); gdp4->bg_free_blocks_count_hi = ext2fs_swab16(gdp4->bg_free_blocks_count_hi); gdp4->bg_free_inodes_count_hi = ext2fs_swab16(gdp4->bg_free_inodes_count_hi); gdp4->bg_used_dirs_count_hi = ext2fs_swab16(gdp4->bg_used_dirs_count_hi); gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi); gdp4->bg_exclude_bitmap_hi = ext2fs_swab16(gdp4->bg_exclude_bitmap_hi); gdp4->bg_block_bitmap_csum_hi = ext2fs_swab16(gdp4->bg_block_bitmap_csum_hi); gdp4->bg_inode_bitmap_csum_hi = ext2fs_swab16(gdp4->bg_inode_bitmap_csum_hi); EXT2FS_BUILD_BUG_ON(sizeof(gdp4->bg_reserved) != sizeof(__u32)); } void ext2fs_swap_group_desc(struct ext2_group_desc *gdp) { ext2fs_swap_group_desc2(0, gdp); } void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header, struct ext2_ext_attr_header *from_header) { int n; to_header->h_magic = ext2fs_swab32(from_header->h_magic); to_header->h_blocks = ext2fs_swab32(from_header->h_blocks); to_header->h_refcount = ext2fs_swab32(from_header->h_refcount); to_header->h_hash = ext2fs_swab32(from_header->h_hash); to_header->h_checksum = ext2fs_swab32(from_header->h_checksum); for (n = 0; n < 3; n++) to_header->h_reserved[n] = ext2fs_swab32(from_header->h_reserved[n]); } void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry, struct ext2_ext_attr_entry *from_entry) { to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs); to_entry->e_value_inum = ext2fs_swab32(from_entry->e_value_inum); to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size); to_entry->e_hash = ext2fs_swab32(from_entry->e_hash); } void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header) { struct ext2_ext_attr_header *from_header = (struct ext2_ext_attr_header *)from; struct ext2_ext_attr_header *to_header = (struct ext2_ext_attr_header *)to; struct ext2_ext_attr_entry *from_entry, *to_entry; char *from_end = (char *)from_header + bufsize; if (to_header != from_header) memcpy(to_header, from_header, bufsize); if (has_header) { ext2fs_swap_ext_attr_header(to_header, from_header); from_entry = (struct ext2_ext_attr_entry *)(from_header+1); to_entry = (struct ext2_ext_attr_entry *)(to_header+1); } else { from_entry = (struct ext2_ext_attr_entry *)from_header; to_entry = (struct ext2_ext_attr_entry *)to_header; } while ((char *)from_entry < from_end && (char *)EXT2_EXT_ATTR_NEXT(from_entry) <= from_end && *(__u32 *)from_entry) { ext2fs_swap_ext_attr_entry(to_entry, from_entry); from_entry = EXT2_EXT_ATTR_NEXT(from_entry); to_entry = EXT2_EXT_ATTR_NEXT(to_entry); } } void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, struct ext2_inode_large *f, int hostorder, int bufsize) { unsigned i, extra_isize, attr_magic; int has_extents = 0, has_inline_data = 0, islnk = 0, fast_symlink = 0; unsigned int inode_size; __u32 *eaf, *eat; /* * Note that t and f may point to the same address. That's why * if (hostorder) condition is executed before swab calls and * if (!hostorder) afterwards. */ if (hostorder) { islnk = LINUX_S_ISLNK(f->i_mode); fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(f)); has_extents = (f->i_flags & EXT4_EXTENTS_FL) != 0; has_inline_data = (f->i_flags & EXT4_INLINE_DATA_FL) != 0; } t->i_mode = ext2fs_swab16(f->i_mode); t->i_uid = ext2fs_swab16(f->i_uid); t->i_size = ext2fs_swab32(f->i_size); t->i_atime = ext2fs_swab32(f->i_atime); t->i_ctime = ext2fs_swab32(f->i_ctime); t->i_mtime = ext2fs_swab32(f->i_mtime); t->i_dtime = ext2fs_swab32(f->i_dtime); t->i_gid = ext2fs_swab16(f->i_gid); t->i_links_count = ext2fs_swab16(f->i_links_count); t->i_file_acl = ext2fs_swab32(f->i_file_acl); t->i_blocks = ext2fs_swab32(f->i_blocks); t->i_flags = ext2fs_swab32(f->i_flags); t->i_size_high = ext2fs_swab32(f->i_size_high); if (!hostorder) { islnk = LINUX_S_ISLNK(t->i_mode); fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(t)); has_extents = (t->i_flags & EXT4_EXTENTS_FL) != 0; has_inline_data = (t->i_flags & EXT4_INLINE_DATA_FL) != 0; } /* * Extent data and inline data are swapped on access, not here */ if (!has_extents && !has_inline_data && (!islnk || !fast_symlink)) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = ext2fs_swab32(f->i_block[i]); } else if (t != f) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = f->i_block[i]; } t->i_generation = ext2fs_swab32(f->i_generation); t->i_faddr = ext2fs_swab32(f->i_faddr); switch (fs->super->s_creator_os) { case EXT2_OS_LINUX: t->osd1.linux1.l_i_version = ext2fs_swab32(f->osd1.linux1.l_i_version); t->osd2.linux2.l_i_blocks_hi = ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi); t->osd2.linux2.l_i_file_acl_high = ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high); t->osd2.linux2.l_i_uid_high = ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); t->osd2.linux2.l_i_gid_high = ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); t->osd2.linux2.l_i_checksum_lo = ext2fs_swab16(f->osd2.linux2.l_i_checksum_lo); break; case EXT2_OS_HURD: t->osd1.hurd1.h_i_translator = ext2fs_swab32 (f->osd1.hurd1.h_i_translator); t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; t->osd2.hurd2.h_i_mode_high = ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); t->osd2.hurd2.h_i_uid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); t->osd2.hurd2.h_i_gid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); t->osd2.hurd2.h_i_author = ext2fs_swab32 (f->osd2.hurd2.h_i_author); break; default: break; } if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) return; /* no i_extra_isize field */ if (hostorder) extra_isize = f->i_extra_isize; t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); if (!hostorder) extra_isize = t->i_extra_isize; if (extra_isize > EXT2_INODE_SIZE(fs->super) - sizeof(struct ext2_inode)) { /* this is error case: i_extra_size is too large */ return; } if (extra_isize & 3) return; /* Illegal inode extra_isize */ inode_size = EXT2_GOOD_OLD_INODE_SIZE + extra_isize; if (inode_includes(inode_size, i_checksum_hi)) t->i_checksum_hi = ext2fs_swab16(f->i_checksum_hi); if (inode_includes(inode_size, i_ctime_extra)) t->i_ctime_extra = ext2fs_swab32(f->i_ctime_extra); if (inode_includes(inode_size, i_mtime_extra)) t->i_mtime_extra = ext2fs_swab32(f->i_mtime_extra); if (inode_includes(inode_size, i_atime_extra)) t->i_atime_extra = ext2fs_swab32(f->i_atime_extra); if (inode_includes(inode_size, i_crtime)) t->i_crtime = ext2fs_swab32(f->i_crtime); if (inode_includes(inode_size, i_crtime_extra)) t->i_crtime_extra = ext2fs_swab32(f->i_crtime_extra); if (inode_includes(inode_size, i_version_hi)) t->i_version_hi = ext2fs_swab32(f->i_version_hi); if (inode_includes(inode_size, i_projid)) t->i_projid = ext2fs_swab32(f->i_projid); /* catch new static fields added after i_projid */ EXT2FS_BUILD_BUG_ON(sizeof(struct ext2_inode_large) != 160); i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32); if (bufsize < (int) i) return; /* no space for EA magic */ eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + extra_isize); attr_magic = *eaf; if (!hostorder) attr_magic = ext2fs_swab32(attr_magic); if (attr_magic != EXT2_EXT_ATTR_MAGIC) return; /* it seems no magic here */ eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + extra_isize); *eat = ext2fs_swab32(*eaf); /* convert EA(s) */ ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), bufsize - sizeof(struct ext2_inode) - extra_isize - sizeof(__u32), 0); } void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t, struct ext2_inode *f, int hostorder) { ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t, (struct ext2_inode_large *) f, hostorder, sizeof(struct ext2_inode)); } void ext2fs_swap_mmp(struct mmp_struct *mmp) { mmp->mmp_magic = ext2fs_swab32(mmp->mmp_magic); mmp->mmp_seq = ext2fs_swab32(mmp->mmp_seq); mmp->mmp_time = ext2fs_swab64(mmp->mmp_time); mmp->mmp_check_interval = ext2fs_swab16(mmp->mmp_check_interval); mmp->mmp_checksum = ext2fs_swab32(mmp->mmp_checksum); } errcode_t ext2fs_dirent_swab_in(ext2_filsys fs, char *buf, int flags) { return ext2fs_dirent_swab_in2(fs, buf, fs->blocksize, flags); } errcode_t ext2fs_dirent_swab_in2(ext2_filsys fs, char *buf, size_t size, int flags) { errcode_t retval; char *p, *end; struct ext2_dir_entry *dirent; unsigned int name_len, rec_len, left; p = (char *) buf; end = (char *) buf + size; left = size; while (p < end-8) { dirent = (struct ext2_dir_entry *) p; dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); name_len = dirent->name_len; if (flags & EXT2_DIRBLOCK_V2_STRUCT) dirent->name_len = ext2fs_swab16(dirent->name_len); retval = ext2fs_get_rec_len(fs, dirent, &rec_len); if (retval) return retval; if ((rec_len < 8) || (rec_len % 4)) { rec_len = 8; if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT)) return EXT2_ET_DIR_CORRUPTED; } else if (((name_len & 0xFF) + 8) > rec_len) if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT)) return EXT2_ET_DIR_CORRUPTED; if (rec_len > left) if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT)) return EXT2_ET_DIR_CORRUPTED; left -= rec_len; p += rec_len; } return 0; } errcode_t ext2fs_dirent_swab_out(ext2_filsys fs, char *buf, int flags) { return ext2fs_dirent_swab_out2(fs, buf, fs->blocksize, flags); } errcode_t ext2fs_dirent_swab_out2(ext2_filsys fs, char *buf, size_t size, int flags) { errcode_t retval; char *p, *end; unsigned int rec_len; struct ext2_dir_entry *dirent; p = buf; end = buf + size; while (p < end) { dirent = (struct ext2_dir_entry *) p; retval = ext2fs_get_rec_len(fs, dirent, &rec_len); if (retval) return retval; if ((rec_len < 8) || (rec_len % 4)) { ext2fs_free_mem(&buf); return EXT2_ET_DIR_CORRUPTED; } p += rec_len; dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); if (rec_len > size) return EXT2_ET_DIR_CORRUPTED; size -= rec_len; if (flags & EXT2_DIRBLOCK_V2_STRUCT) dirent->name_len = ext2fs_swab16(dirent->name_len); } return 0; }