1 /* 2 * swapfs.c --- swap ext2 filesystem data structures 3 * 4 * Copyright (C) 1995, 1996, 2002 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Library 8 * General Public License, version 2. 9 * %End-Header% 10 */ 11 12 #include "config.h" 13 #include <stdio.h> 14 #if HAVE_UNISTD_H 15 #include <unistd.h> 16 #endif 17 #include <string.h> 18 #include <time.h> 19 20 #include "ext2_fs.h" 21 #include "ext2fs.h" 22 #include "ext2fsP.h" 23 #include <ext2fs/ext2_ext_attr.h> 24 25 void ext2fs_swap_super(struct ext2_super_block * sb) 26 { 27 int i; 28 29 sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); 30 sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); 31 sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); 32 sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); 33 sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); 34 sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); 35 sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); 36 sb->s_log_cluster_size = ext2fs_swab32(sb->s_log_cluster_size); 37 sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); 38 sb->s_clusters_per_group = ext2fs_swab32(sb->s_clusters_per_group); 39 sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); 40 sb->s_mtime = ext2fs_swab32(sb->s_mtime); 41 sb->s_wtime = ext2fs_swab32(sb->s_wtime); 42 sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); 43 sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); 44 sb->s_magic = ext2fs_swab16(sb->s_magic); 45 sb->s_state = ext2fs_swab16(sb->s_state); 46 sb->s_errors = ext2fs_swab16(sb->s_errors); 47 sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); 48 sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); 49 sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); 50 sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); 51 sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); 52 sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); 53 sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); 54 sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); 55 sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); 56 sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); 57 sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); 58 sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); 59 sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); 60 /* sb->s_uuid is __u8 and does not need swabbing */ 61 /* sb->s_volume_name is char and does not need swabbing */ 62 /* sb->s_last_mounted is char and does not need swabbing */ 63 sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); 64 /* sb->s_prealloc_blocks is __u8 and does not need swabbing */ 65 /* sb->s_prealloc_dir_blocks is __u8 and does not need swabbing */ 66 sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); 67 /* sb->s_journal_uuid is __u8 and does not need swabbing */ 68 sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); 69 sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); 70 sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); 71 for (i = 0; i < 4; i++) 72 sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); 73 /* sb->s_def_hash_version is __u8 and does not need swabbing */ 74 /* sb->s_jnl_backup_type is __u8 and does not need swabbing */ 75 sb->s_desc_size = ext2fs_swab16(sb->s_desc_size); 76 sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); 77 sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); 78 sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); 79 /* if journal backup is for a valid extent-based journal... */ 80 if (ext2fs_extent_header_verify(sb->s_jnl_blocks, 81 sizeof(sb->s_jnl_blocks)) == 0) { 82 /* ... swap only the journal i_size and i_size_high, 83 * and the extent data is not swapped on read */ 84 i = 15; 85 } else { 86 /* direct/indirect journal: swap it all */ 87 i = 0; 88 } 89 for (; i < 17; i++) 90 sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); 91 sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi); 92 sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi); 93 sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi); 94 sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize); 95 sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize); 96 sb->s_flags = ext2fs_swab32(sb->s_flags); 97 sb->s_raid_stride = ext2fs_swab16(sb->s_raid_stride); 98 sb->s_mmp_update_interval = ext2fs_swab16(sb->s_mmp_update_interval); 99 sb->s_mmp_block = ext2fs_swab64(sb->s_mmp_block); 100 sb->s_raid_stripe_width = ext2fs_swab32(sb->s_raid_stripe_width); 101 /* sb->s_log_groups_per_flex is __u8 and does not need swabbing */ 102 /* sb->s_checksum_type is __u8 and does not need swabbing */ 103 /* sb->s_encryption_level is __u8 and does not need swabbing */ 104 /* sb->s_reserved_pad is __u8 and does not need swabbing */ 105 sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written); 106 sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum); 107 sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id); 108 sb->s_snapshot_r_blocks_count = 109 ext2fs_swab64(sb->s_snapshot_r_blocks_count); 110 sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list); 111 sb->s_error_count = ext2fs_swab32(sb->s_error_count); 112 sb->s_first_error_time = ext2fs_swab32(sb->s_first_error_time); 113 sb->s_first_error_ino = ext2fs_swab32(sb->s_first_error_ino); 114 sb->s_first_error_block = ext2fs_swab64(sb->s_first_error_block); 115 /* sb->s_first_error_func is __u8 and does not need swabbing */ 116 sb->s_last_error_time = ext2fs_swab32(sb->s_last_error_time); 117 sb->s_last_error_ino = ext2fs_swab32(sb->s_last_error_ino); 118 sb->s_last_error_block = ext2fs_swab64(sb->s_last_error_block); 119 /* sb->s_last_error_func is __u8 and does not need swabbing */ 120 /* sb->s_mount_opts is __u8 and does not need swabbing */ 121 sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum); 122 sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum); 123 sb->s_overhead_clusters = ext2fs_swab32(sb->s_overhead_clusters); 124 sb->s_backup_bgs[0] = ext2fs_swab32(sb->s_backup_bgs[0]); 125 sb->s_backup_bgs[1] = ext2fs_swab32(sb->s_backup_bgs[1]); 126 /* sb->s_encrypt_algos is __u8 and does not need swabbing */ 127 /* sb->s_encrypt_pw_salt is __u8 and does not need swabbing */ 128 sb->s_lpf_ino = ext2fs_swab32(sb->s_lpf_ino); 129 sb->s_prj_quota_inum = ext2fs_swab32(sb->s_prj_quota_inum); 130 sb->s_checksum_seed = ext2fs_swab32(sb->s_checksum_seed); 131 /* s_*_time_hi are __u8 and does not need swabbing */ 132 sb->s_encoding = ext2fs_swab16(sb->s_encoding); 133 sb->s_encoding_flags = ext2fs_swab16(sb->s_encoding_flags); 134 /* catch when new fields are used from s_reserved */ 135 EXT2FS_BUILD_BUG_ON(sizeof(sb->s_reserved) != 95 * sizeof(__le32)); 136 sb->s_checksum = ext2fs_swab32(sb->s_checksum); 137 } 138 139 void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp) 140 { 141 struct ext4_group_desc *gdp4 = (struct ext4_group_desc *)gdp; 142 143 /* Do the 32-bit parts first */ 144 gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); 145 gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); 146 gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); 147 gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); 148 gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); 149 gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); 150 gdp->bg_flags = ext2fs_swab16(gdp->bg_flags); 151 gdp->bg_exclude_bitmap_lo = ext2fs_swab32(gdp->bg_exclude_bitmap_lo); 152 gdp->bg_block_bitmap_csum_lo = 153 ext2fs_swab16(gdp->bg_block_bitmap_csum_lo); 154 gdp->bg_inode_bitmap_csum_lo = 155 ext2fs_swab16(gdp->bg_inode_bitmap_csum_lo); 156 gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused); 157 gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum); 158 /* If we're 32-bit, we're done */ 159 if (fs == NULL || EXT2_DESC_SIZE(fs->super) < EXT2_MIN_DESC_SIZE_64BIT) 160 return; 161 162 /* Swap the 64-bit parts */ 163 gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi); 164 gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi); 165 gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi); 166 gdp4->bg_free_blocks_count_hi = 167 ext2fs_swab16(gdp4->bg_free_blocks_count_hi); 168 gdp4->bg_free_inodes_count_hi = 169 ext2fs_swab16(gdp4->bg_free_inodes_count_hi); 170 gdp4->bg_used_dirs_count_hi = 171 ext2fs_swab16(gdp4->bg_used_dirs_count_hi); 172 gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi); 173 gdp4->bg_exclude_bitmap_hi = ext2fs_swab16(gdp4->bg_exclude_bitmap_hi); 174 gdp4->bg_block_bitmap_csum_hi = 175 ext2fs_swab16(gdp4->bg_block_bitmap_csum_hi); 176 gdp4->bg_inode_bitmap_csum_hi = 177 ext2fs_swab16(gdp4->bg_inode_bitmap_csum_hi); 178 EXT2FS_BUILD_BUG_ON(sizeof(gdp4->bg_reserved) != sizeof(__u32)); 179 } 180 181 void ext2fs_swap_group_desc(struct ext2_group_desc *gdp) 182 { 183 ext2fs_swap_group_desc2(0, gdp); 184 } 185 186 187 void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header, 188 struct ext2_ext_attr_header *from_header) 189 { 190 int n; 191 192 to_header->h_magic = ext2fs_swab32(from_header->h_magic); 193 to_header->h_blocks = ext2fs_swab32(from_header->h_blocks); 194 to_header->h_refcount = ext2fs_swab32(from_header->h_refcount); 195 to_header->h_hash = ext2fs_swab32(from_header->h_hash); 196 to_header->h_checksum = ext2fs_swab32(from_header->h_checksum); 197 for (n = 0; n < 3; n++) 198 to_header->h_reserved[n] = 199 ext2fs_swab32(from_header->h_reserved[n]); 200 } 201 202 void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry, 203 struct ext2_ext_attr_entry *from_entry) 204 { 205 to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs); 206 to_entry->e_value_inum = ext2fs_swab32(from_entry->e_value_inum); 207 to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size); 208 to_entry->e_hash = ext2fs_swab32(from_entry->e_hash); 209 } 210 211 void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header) 212 { 213 struct ext2_ext_attr_header *from_header = 214 (struct ext2_ext_attr_header *)from; 215 struct ext2_ext_attr_header *to_header = 216 (struct ext2_ext_attr_header *)to; 217 struct ext2_ext_attr_entry *from_entry, *to_entry; 218 char *from_end = (char *)from_header + bufsize; 219 220 if (to_header != from_header) 221 memcpy(to_header, from_header, bufsize); 222 223 if (has_header) { 224 ext2fs_swap_ext_attr_header(to_header, from_header); 225 226 from_entry = (struct ext2_ext_attr_entry *)(from_header+1); 227 to_entry = (struct ext2_ext_attr_entry *)(to_header+1); 228 } else { 229 from_entry = (struct ext2_ext_attr_entry *)from_header; 230 to_entry = (struct ext2_ext_attr_entry *)to_header; 231 } 232 233 while ((char *)from_entry < from_end && 234 (char *)EXT2_EXT_ATTR_NEXT(from_entry) <= from_end && 235 *(__u32 *)from_entry) { 236 ext2fs_swap_ext_attr_entry(to_entry, from_entry); 237 from_entry = EXT2_EXT_ATTR_NEXT(from_entry); 238 to_entry = EXT2_EXT_ATTR_NEXT(to_entry); 239 } 240 } 241 242 void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, 243 struct ext2_inode_large *f, int hostorder, 244 int bufsize) 245 { 246 unsigned i, extra_isize, attr_magic; 247 int has_extents, has_inline_data, islnk, fast_symlink; 248 unsigned int inode_size; 249 __u32 *eaf, *eat; 250 251 /* 252 * Note that t and f may point to the same address. That's why 253 * if (hostorder) condition is executed before swab calls and 254 * if (!hostorder) afterwards. 255 */ 256 if (hostorder) { 257 islnk = LINUX_S_ISLNK(f->i_mode); 258 fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(f)); 259 has_extents = (f->i_flags & EXT4_EXTENTS_FL) != 0; 260 has_inline_data = (f->i_flags & EXT4_INLINE_DATA_FL) != 0; 261 } 262 263 t->i_mode = ext2fs_swab16(f->i_mode); 264 t->i_uid = ext2fs_swab16(f->i_uid); 265 t->i_size = ext2fs_swab32(f->i_size); 266 t->i_atime = ext2fs_swab32(f->i_atime); 267 t->i_ctime = ext2fs_swab32(f->i_ctime); 268 t->i_mtime = ext2fs_swab32(f->i_mtime); 269 t->i_dtime = ext2fs_swab32(f->i_dtime); 270 t->i_gid = ext2fs_swab16(f->i_gid); 271 t->i_links_count = ext2fs_swab16(f->i_links_count); 272 t->i_file_acl = ext2fs_swab32(f->i_file_acl); 273 t->i_blocks = ext2fs_swab32(f->i_blocks); 274 t->i_flags = ext2fs_swab32(f->i_flags); 275 t->i_size_high = ext2fs_swab32(f->i_size_high); 276 277 if (!hostorder) { 278 islnk = LINUX_S_ISLNK(t->i_mode); 279 fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(t)); 280 has_extents = (t->i_flags & EXT4_EXTENTS_FL) != 0; 281 has_inline_data = (t->i_flags & EXT4_INLINE_DATA_FL) != 0; 282 } 283 284 /* 285 * Extent data and inline data are swapped on access, not here 286 */ 287 if (!has_extents && !has_inline_data && (!islnk || !fast_symlink)) { 288 for (i = 0; i < EXT2_N_BLOCKS; i++) 289 t->i_block[i] = ext2fs_swab32(f->i_block[i]); 290 } else if (t != f) { 291 for (i = 0; i < EXT2_N_BLOCKS; i++) 292 t->i_block[i] = f->i_block[i]; 293 } 294 t->i_generation = ext2fs_swab32(f->i_generation); 295 t->i_faddr = ext2fs_swab32(f->i_faddr); 296 297 switch (fs->super->s_creator_os) { 298 case EXT2_OS_LINUX: 299 t->osd1.linux1.l_i_version = 300 ext2fs_swab32(f->osd1.linux1.l_i_version); 301 t->osd2.linux2.l_i_blocks_hi = 302 ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi); 303 t->osd2.linux2.l_i_file_acl_high = 304 ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high); 305 t->osd2.linux2.l_i_uid_high = 306 ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); 307 t->osd2.linux2.l_i_gid_high = 308 ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); 309 t->osd2.linux2.l_i_checksum_lo = 310 ext2fs_swab16(f->osd2.linux2.l_i_checksum_lo); 311 break; 312 case EXT2_OS_HURD: 313 t->osd1.hurd1.h_i_translator = 314 ext2fs_swab32 (f->osd1.hurd1.h_i_translator); 315 t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; 316 t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; 317 t->osd2.hurd2.h_i_mode_high = 318 ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); 319 t->osd2.hurd2.h_i_uid_high = 320 ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); 321 t->osd2.hurd2.h_i_gid_high = 322 ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); 323 t->osd2.hurd2.h_i_author = 324 ext2fs_swab32 (f->osd2.hurd2.h_i_author); 325 break; 326 default: 327 break; 328 } 329 330 if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) 331 return; /* no i_extra_isize field */ 332 333 if (hostorder) 334 extra_isize = f->i_extra_isize; 335 t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); 336 if (!hostorder) 337 extra_isize = t->i_extra_isize; 338 if (extra_isize > EXT2_INODE_SIZE(fs->super) - 339 sizeof(struct ext2_inode)) { 340 /* this is error case: i_extra_size is too large */ 341 return; 342 } 343 if (extra_isize & 3) 344 return; /* Illegal inode extra_isize */ 345 346 inode_size = EXT2_GOOD_OLD_INODE_SIZE + extra_isize; 347 if (inode_includes(inode_size, i_checksum_hi)) 348 t->i_checksum_hi = ext2fs_swab16(f->i_checksum_hi); 349 if (inode_includes(inode_size, i_ctime_extra)) 350 t->i_ctime_extra = ext2fs_swab32(f->i_ctime_extra); 351 if (inode_includes(inode_size, i_mtime_extra)) 352 t->i_mtime_extra = ext2fs_swab32(f->i_mtime_extra); 353 if (inode_includes(inode_size, i_atime_extra)) 354 t->i_atime_extra = ext2fs_swab32(f->i_atime_extra); 355 if (inode_includes(inode_size, i_crtime)) 356 t->i_crtime = ext2fs_swab32(f->i_crtime); 357 if (inode_includes(inode_size, i_crtime_extra)) 358 t->i_crtime_extra = ext2fs_swab32(f->i_crtime_extra); 359 if (inode_includes(inode_size, i_version_hi)) 360 t->i_version_hi = ext2fs_swab32(f->i_version_hi); 361 if (inode_includes(inode_size, i_projid)) 362 t->i_projid = ext2fs_swab32(f->i_projid); 363 /* catch new static fields added after i_projid */ 364 EXT2FS_BUILD_BUG_ON(sizeof(struct ext2_inode_large) != 160); 365 366 i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32); 367 if (bufsize < (int) i) 368 return; /* no space for EA magic */ 369 370 eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + 371 extra_isize); 372 373 attr_magic = *eaf; 374 if (!hostorder) 375 attr_magic = ext2fs_swab32(attr_magic); 376 377 if (attr_magic != EXT2_EXT_ATTR_MAGIC) 378 return; /* it seems no magic here */ 379 380 eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + 381 extra_isize); 382 *eat = ext2fs_swab32(*eaf); 383 384 /* convert EA(s) */ 385 ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), 386 bufsize - sizeof(struct ext2_inode) - 387 extra_isize - sizeof(__u32), 0); 388 389 } 390 391 void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t, 392 struct ext2_inode *f, int hostorder) 393 { 394 ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t, 395 (struct ext2_inode_large *) f, hostorder, 396 sizeof(struct ext2_inode)); 397 } 398 399 void ext2fs_swap_mmp(struct mmp_struct *mmp) 400 { 401 mmp->mmp_magic = ext2fs_swab32(mmp->mmp_magic); 402 mmp->mmp_seq = ext2fs_swab32(mmp->mmp_seq); 403 mmp->mmp_time = ext2fs_swab64(mmp->mmp_time); 404 mmp->mmp_check_interval = ext2fs_swab16(mmp->mmp_check_interval); 405 mmp->mmp_checksum = ext2fs_swab32(mmp->mmp_checksum); 406 } 407 408 errcode_t ext2fs_dirent_swab_in(ext2_filsys fs, char *buf, int flags) 409 { 410 return ext2fs_dirent_swab_in2(fs, buf, fs->blocksize, flags); 411 } 412 413 errcode_t ext2fs_dirent_swab_in2(ext2_filsys fs, char *buf, 414 size_t size, int flags) 415 { 416 errcode_t retval; 417 char *p, *end; 418 struct ext2_dir_entry *dirent; 419 unsigned int name_len, rec_len, left; 420 421 p = (char *) buf; 422 end = (char *) buf + size; 423 left = size; 424 while (p < end-8) { 425 dirent = (struct ext2_dir_entry *) p; 426 dirent->inode = ext2fs_swab32(dirent->inode); 427 dirent->rec_len = ext2fs_swab16(dirent->rec_len); 428 dirent->name_len = ext2fs_swab16(dirent->name_len); 429 name_len = dirent->name_len; 430 if (flags & EXT2_DIRBLOCK_V2_STRUCT) 431 dirent->name_len = ext2fs_swab16(dirent->name_len); 432 retval = ext2fs_get_rec_len(fs, dirent, &rec_len); 433 if (retval) 434 return retval; 435 if ((rec_len < 8) || (rec_len % 4)) { 436 rec_len = 8; 437 retval = EXT2_ET_DIR_CORRUPTED; 438 } else if (((name_len & 0xFF) + 8) > rec_len) 439 retval = EXT2_ET_DIR_CORRUPTED; 440 if (rec_len > left) 441 return EXT2_ET_DIR_CORRUPTED; 442 left -= rec_len; 443 p += rec_len; 444 } 445 446 return 0; 447 } 448 449 errcode_t ext2fs_dirent_swab_out(ext2_filsys fs, char *buf, int flags) 450 { 451 return ext2fs_dirent_swab_out2(fs, buf, fs->blocksize, flags); 452 } 453 454 errcode_t ext2fs_dirent_swab_out2(ext2_filsys fs, char *buf, 455 size_t size, int flags) 456 { 457 errcode_t retval; 458 char *p, *end; 459 unsigned int rec_len; 460 struct ext2_dir_entry *dirent; 461 462 p = buf; 463 end = buf + size; 464 while (p < end) { 465 dirent = (struct ext2_dir_entry *) p; 466 retval = ext2fs_get_rec_len(fs, dirent, &rec_len); 467 if (retval) 468 return retval; 469 if ((rec_len < 8) || 470 (rec_len % 4)) { 471 ext2fs_free_mem(&buf); 472 return EXT2_ET_DIR_CORRUPTED; 473 } 474 p += rec_len; 475 dirent->inode = ext2fs_swab32(dirent->inode); 476 dirent->rec_len = ext2fs_swab16(dirent->rec_len); 477 dirent->name_len = ext2fs_swab16(dirent->name_len); 478 if (rec_len > size) 479 return EXT2_ET_DIR_CORRUPTED; 480 size -= rec_len; 481 482 if (flags & EXT2_DIRBLOCK_V2_STRUCT) 483 dirent->name_len = ext2fs_swab16(dirent->name_len); 484 } 485 486 return 0; 487 }