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