1 /* 2 * pass3.c -- pass #3 of e2fsck: Check for directory connectivity 3 * 4 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Public 8 * License. 9 * %End-Header% 10 * 11 * Pass #3 assures that all directories are connected to the 12 * filesystem tree, using the following algorithm: 13 * 14 * First, the root directory is checked to make sure it exists; if 15 * not, e2fsck will offer to create a new one. It is then marked as 16 * "done". 17 * 18 * Then, pass3 interates over all directory inodes; for each directory 19 * it attempts to trace up the filesystem tree, using dirinfo.parent 20 * until it reaches a directory which has been marked "done". If it 21 * can not do so, then the directory must be disconnected, and e2fsck 22 * will offer to reconnect it to /lost+found. While it is chasing 23 * parent pointers up the filesystem tree, if pass3 sees a directory 24 * twice, then it has detected a filesystem loop, and it will again 25 * offer to reconnect the directory to /lost+found in to break the 26 * filesystem loop. 27 * 28 * Pass 3 also contains the subroutine, e2fsck_reconnect_file() to 29 * reconnect inodes to /lost+found; this subroutine is also used by 30 * pass 4. e2fsck_reconnect_file() calls get_lost_and_found(), which 31 * is responsible for creating /lost+found if it does not exist. 32 * 33 * Pass 3 frees the following data structures: 34 * - The dirinfo directory information cache. 35 */ 36 37 #include "config.h" 38 #ifdef HAVE_ERRNO_H 39 #include <errno.h> 40 #endif 41 42 #include "e2fsck.h" 43 #include "problem.h" 44 45 static void check_root(e2fsck_t ctx); 46 static int check_directory(e2fsck_t ctx, ext2_ino_t ino, 47 struct problem_context *pctx); 48 static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent); 49 50 static ext2fs_inode_bitmap inode_loop_detect = 0; 51 static ext2fs_inode_bitmap inode_done_map = 0; 52 53 void e2fsck_pass3(e2fsck_t ctx) 54 { 55 ext2_filsys fs = ctx->fs; 56 struct dir_info_iter *iter = NULL; 57 #ifdef RESOURCE_TRACK 58 struct resource_track rtrack; 59 #endif 60 struct problem_context pctx; 61 struct dir_info *dir; 62 unsigned long maxdirs, count; 63 64 init_resource_track(&rtrack, ctx->fs->io); 65 clear_problem_context(&pctx); 66 67 #ifdef MTRACE 68 mtrace_print("Pass 3"); 69 #endif 70 71 if (!(ctx->options & E2F_OPT_PREEN)) 72 fix_problem(ctx, PR_3_PASS_HEADER, &pctx); 73 74 /* 75 * Allocate some bitmaps to do loop detection. 76 */ 77 pctx.errcode = e2fsck_allocate_inode_bitmap(fs, _("inode done bitmap"), 78 EXT2FS_BMAP64_AUTODIR, 79 "inode_done_map", &inode_done_map); 80 if (pctx.errcode) { 81 pctx.num = 2; 82 fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx); 83 ctx->flags |= E2F_FLAG_ABORT; 84 goto abort_exit; 85 } 86 print_resource_track(ctx, _("Peak memory"), &ctx->global_rtrack, NULL); 87 88 check_root(ctx); 89 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 90 goto abort_exit; 91 92 ext2fs_mark_inode_bitmap2(inode_done_map, EXT2_ROOT_INO); 93 94 maxdirs = e2fsck_get_num_dirinfo(ctx); 95 count = 1; 96 97 if (ctx->progress) 98 if ((ctx->progress)(ctx, 3, 0, maxdirs)) 99 goto abort_exit; 100 101 iter = e2fsck_dir_info_iter_begin(ctx); 102 while ((dir = e2fsck_dir_info_iter(ctx, iter)) != 0) { 103 if (ctx->flags & E2F_FLAG_SIGNAL_MASK || 104 ctx->flags & E2F_FLAG_RESTART) 105 goto abort_exit; 106 if (ctx->progress && (ctx->progress)(ctx, 3, count++, maxdirs)) 107 goto abort_exit; 108 if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dir->ino)) 109 if (check_directory(ctx, dir->ino, &pctx)) 110 goto abort_exit; 111 } 112 113 /* 114 * Force the creation of /lost+found if not present 115 */ 116 if ((ctx->options & E2F_OPT_READONLY) == 0) 117 e2fsck_get_lost_and_found(ctx, 1); 118 119 /* 120 * If there are any directories that need to be indexed or 121 * optimized, do it here. 122 */ 123 e2fsck_rehash_directories(ctx); 124 125 abort_exit: 126 if (iter) 127 e2fsck_dir_info_iter_end(ctx, iter); 128 e2fsck_free_dir_info(ctx); 129 if (inode_loop_detect) { 130 ext2fs_free_inode_bitmap(inode_loop_detect); 131 inode_loop_detect = 0; 132 } 133 if (inode_done_map) { 134 ext2fs_free_inode_bitmap(inode_done_map); 135 inode_done_map = 0; 136 } 137 138 if (ctx->lnf_repair_block) { 139 ext2fs_unmark_block_bitmap2(ctx->block_found_map, 140 ctx->lnf_repair_block); 141 ctx->lnf_repair_block = 0; 142 } 143 if (ctx->root_repair_block) { 144 ext2fs_unmark_block_bitmap2(ctx->block_found_map, 145 ctx->root_repair_block); 146 ctx->root_repair_block = 0; 147 } 148 149 print_resource_track(ctx, _("Pass 3"), &rtrack, ctx->fs->io); 150 } 151 152 /* 153 * This makes sure the root inode is present; if not, we ask if the 154 * user wants us to create it. Not creating it is a fatal error. 155 */ 156 static void check_root(e2fsck_t ctx) 157 { 158 ext2_filsys fs = ctx->fs; 159 blk64_t blk; 160 struct ext2_inode inode; 161 char * block; 162 struct problem_context pctx; 163 164 clear_problem_context(&pctx); 165 166 if (ext2fs_test_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO)) { 167 /* 168 * If the root inode is not a directory, die here. The 169 * user must have answered 'no' in pass1 when we 170 * offered to clear it. 171 */ 172 if (!(ext2fs_test_inode_bitmap2(ctx->inode_dir_map, 173 EXT2_ROOT_INO))) { 174 fix_problem(ctx, PR_3_ROOT_NOT_DIR_ABORT, &pctx); 175 ctx->flags |= E2F_FLAG_ABORT; 176 } 177 return; 178 } 179 180 if (!fix_problem(ctx, PR_3_NO_ROOT_INODE, &pctx)) { 181 fix_problem(ctx, PR_3_NO_ROOT_INODE_ABORT, &pctx); 182 ctx->flags |= E2F_FLAG_ABORT; 183 return; 184 } 185 186 e2fsck_read_bitmaps(ctx); 187 188 /* 189 * First, find a free block 190 */ 191 if (ctx->root_repair_block) { 192 blk = ctx->root_repair_block; 193 ctx->root_repair_block = 0; 194 goto skip_new_block; 195 } 196 pctx.errcode = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk); 197 if (pctx.errcode) { 198 pctx.str = "ext2fs_new_block"; 199 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); 200 ctx->flags |= E2F_FLAG_ABORT; 201 return; 202 } 203 ext2fs_mark_block_bitmap2(ctx->block_found_map, blk); 204 skip_new_block: 205 ext2fs_mark_block_bitmap2(fs->block_map, blk); 206 ext2fs_mark_bb_dirty(fs); 207 208 /* 209 * Set up the inode structure 210 */ 211 memset(&inode, 0, sizeof(inode)); 212 inode.i_mode = 040755; 213 inode.i_size = fs->blocksize; 214 inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now; 215 inode.i_links_count = 2; 216 ext2fs_iblk_set(fs, &inode, 1); 217 inode.i_block[0] = blk; 218 219 /* 220 * Write out the inode. 221 */ 222 pctx.errcode = ext2fs_write_new_inode(fs, EXT2_ROOT_INO, &inode); 223 if (pctx.errcode) { 224 pctx.str = "ext2fs_write_inode"; 225 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); 226 ctx->flags |= E2F_FLAG_ABORT; 227 return; 228 } 229 230 /* 231 * Now let's create the actual data block for the inode. 232 * Due to metadata_csum, we must write the dir blocks AFTER 233 * the inode has been written to disk! 234 */ 235 pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, 236 &block); 237 if (pctx.errcode) { 238 pctx.str = "ext2fs_new_dir_block"; 239 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); 240 ctx->flags |= E2F_FLAG_ABORT; 241 return; 242 } 243 244 pctx.errcode = ext2fs_write_dir_block4(fs, blk, block, 0, 245 EXT2_ROOT_INO); 246 ext2fs_free_mem(&block); 247 if (pctx.errcode) { 248 pctx.str = "ext2fs_write_dir_block4"; 249 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); 250 ctx->flags |= E2F_FLAG_ABORT; 251 return; 252 } 253 254 /* 255 * Miscellaneous bookkeeping... 256 */ 257 e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO); 258 ext2fs_icount_store(ctx->inode_count, EXT2_ROOT_INO, 2); 259 ext2fs_icount_store(ctx->inode_link_info, EXT2_ROOT_INO, 2); 260 261 ext2fs_mark_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO); 262 ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, EXT2_ROOT_INO); 263 ext2fs_mark_inode_bitmap2(fs->inode_map, EXT2_ROOT_INO); 264 ext2fs_mark_ib_dirty(fs); 265 } 266 267 /* 268 * This subroutine is responsible for making sure that a particular 269 * directory is connected to the root; if it isn't we trace it up as 270 * far as we can go, and then offer to connect the resulting parent to 271 * the lost+found. We have to do loop detection; if we ever discover 272 * a loop, we treat that as a disconnected directory and offer to 273 * reparent it to lost+found. 274 * 275 * However, loop detection is expensive, because for very large 276 * filesystems, the inode_loop_detect bitmap is huge, and clearing it 277 * is non-trivial. Loops in filesystems are also a rare error case, 278 * and we shouldn't optimize for error cases. So we try two passes of 279 * the algorithm. The first time, we ignore loop detection and merely 280 * increment a counter; if the counter exceeds some extreme threshold, 281 * then we try again with the loop detection bitmap enabled. 282 */ 283 static int check_directory(e2fsck_t ctx, ext2_ino_t dir, 284 struct problem_context *pctx) 285 { 286 ext2_filsys fs = ctx->fs; 287 ext2_ino_t ino = dir, parent; 288 int loop_pass = 0, parent_count = 0; 289 290 while (1) { 291 /* 292 * Mark this inode as being "done"; by the time we 293 * return from this function, the inode we either be 294 * verified as being connected to the directory tree, 295 * or we will have offered to reconnect this to 296 * lost+found. 297 * 298 * If it was marked done already, then we've reached a 299 * parent we've already checked. 300 */ 301 if (ext2fs_mark_inode_bitmap2(inode_done_map, ino)) 302 break; 303 304 if (e2fsck_dir_info_get_parent(ctx, ino, &parent)) { 305 fix_problem(ctx, PR_3_NO_DIRINFO, pctx); 306 return 0; 307 } 308 309 /* 310 * If this directory doesn't have a parent, or we've 311 * seen the parent once already, then offer to 312 * reparent it to lost+found 313 */ 314 if (!parent || 315 (loop_pass && 316 (ext2fs_test_inode_bitmap2(inode_loop_detect, 317 parent)))) { 318 pctx->ino = ino; 319 if (fix_problem(ctx, PR_3_UNCONNECTED_DIR, pctx)) { 320 if (e2fsck_reconnect_file(ctx, pctx->ino)) 321 ext2fs_unmark_valid(fs); 322 else { 323 fix_dotdot(ctx, pctx->ino, 324 ctx->lost_and_found); 325 parent = ctx->lost_and_found; 326 } 327 } 328 break; 329 } 330 ino = parent; 331 if (loop_pass) { 332 ext2fs_mark_inode_bitmap2(inode_loop_detect, ino); 333 } else if (parent_count++ > 2048) { 334 /* 335 * If we've run into a path depth that's 336 * greater than 2048, try again with the inode 337 * loop bitmap turned on and start from the 338 * top. 339 */ 340 loop_pass = 1; 341 if (inode_loop_detect) 342 ext2fs_clear_inode_bitmap(inode_loop_detect); 343 else { 344 pctx->errcode = e2fsck_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), EXT2FS_BMAP64_AUTODIR, "inode_loop_detect", &inode_loop_detect); 345 if (pctx->errcode) { 346 pctx->num = 1; 347 fix_problem(ctx, 348 PR_3_ALLOCATE_IBITMAP_ERROR, pctx); 349 ctx->flags |= E2F_FLAG_ABORT; 350 return -1; 351 } 352 } 353 ino = dir; 354 } 355 } 356 357 /* 358 * Make sure that .. and the parent directory are the same; 359 * offer to fix it if not. 360 */ 361 pctx->ino = dir; 362 if (e2fsck_dir_info_get_dotdot(ctx, dir, &pctx->ino2) || 363 e2fsck_dir_info_get_parent(ctx, dir, &pctx->dir)) { 364 fix_problem(ctx, PR_3_NO_DIRINFO, pctx); 365 return 0; 366 } 367 if (pctx->ino2 != pctx->dir) { 368 if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx)) 369 fix_dotdot(ctx, dir, pctx->dir); 370 } 371 return 0; 372 } 373 374 /* 375 * This routine gets the lost_and_found inode, making it a directory 376 * if necessary 377 */ 378 ext2_ino_t e2fsck_get_lost_and_found(e2fsck_t ctx, int fix) 379 { 380 ext2_filsys fs = ctx->fs; 381 ext2_ino_t ino; 382 blk64_t blk; 383 errcode_t retval; 384 struct ext2_inode_large inode; 385 char * block; 386 static const char name[] = "lost+found"; 387 struct problem_context pctx; 388 int will_rehash, flags; 389 390 if (ctx->lost_and_found) 391 return ctx->lost_and_found; 392 393 clear_problem_context(&pctx); 394 395 will_rehash = e2fsck_dir_will_be_rehashed(ctx, EXT2_ROOT_INO); 396 if (will_rehash) { 397 flags = ctx->fs->flags; 398 ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS; 399 } 400 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name, 401 sizeof(name)-1, 0, &ino); 402 if (will_rehash) 403 ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) | 404 (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS); 405 if (retval && !fix) 406 return 0; 407 if (!retval) { 408 /* Lost+found shouldn't have inline data */ 409 retval = ext2fs_read_inode_full(fs, ino, EXT2_INODE(&inode), 410 sizeof(inode)); 411 if (fix && retval) 412 return 0; 413 414 if (fix && (inode.i_flags & EXT4_INLINE_DATA_FL)) { 415 if (!fix_problem(ctx, PR_3_LPF_INLINE_DATA, &pctx)) 416 return 0; 417 goto unlink; 418 } 419 420 if (fix && (inode.i_flags & EXT4_ENCRYPT_FL)) { 421 if (!fix_problem(ctx, PR_3_LPF_ENCRYPTED, &pctx)) 422 return 0; 423 goto unlink; 424 } 425 426 if (ext2fs_check_directory(fs, ino) == 0) { 427 ctx->lost_and_found = ino; 428 return ino; 429 } 430 431 /* Lost+found isn't a directory! */ 432 if (!fix) 433 return 0; 434 pctx.ino = ino; 435 if (!fix_problem(ctx, PR_3_LPF_NOTDIR, &pctx)) 436 return 0; 437 438 unlink: 439 /* OK, unlink the old /lost+found file. */ 440 pctx.errcode = ext2fs_unlink(fs, EXT2_ROOT_INO, name, ino, 0); 441 if (pctx.errcode) { 442 pctx.str = "ext2fs_unlink"; 443 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); 444 return 0; 445 } 446 (void) e2fsck_dir_info_set_parent(ctx, ino, 0); 447 e2fsck_adjust_inode_count(ctx, ino, -1); 448 /* 449 * If the old lost+found was a directory, we've just 450 * disconnected it from the directory tree, which 451 * means we need to restart the directory tree scan. 452 * The simplest way to do this is restart the whole 453 * e2fsck operation. 454 */ 455 if (LINUX_S_ISDIR(inode.i_mode)) 456 ctx->flags |= E2F_FLAG_RESTART; 457 } else if (retval != EXT2_ET_FILE_NOT_FOUND) { 458 pctx.errcode = retval; 459 fix_problem(ctx, PR_3_ERR_FIND_LPF, &pctx); 460 } 461 if (!fix_problem(ctx, PR_3_NO_LF_DIR, 0)) 462 return 0; 463 464 /* 465 * Read the inode and block bitmaps in; we'll be messing with 466 * them. 467 */ 468 e2fsck_read_bitmaps(ctx); 469 470 /* 471 * First, find a free block 472 */ 473 if (ctx->lnf_repair_block) { 474 blk = ctx->lnf_repair_block; 475 ctx->lnf_repair_block = 0; 476 goto skip_new_block; 477 } 478 retval = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk); 479 if (retval == EXT2_ET_BLOCK_ALLOC_FAIL && 480 fix_problem(ctx, PR_3_LPF_NO_SPACE, &pctx)) { 481 fix_problem(ctx, PR_3_NO_SPACE_TO_RECOVER, &pctx); 482 ctx->lost_and_found = EXT2_ROOT_INO; 483 return 0; 484 } 485 if (retval) { 486 pctx.errcode = retval; 487 fix_problem(ctx, PR_3_ERR_LPF_NEW_BLOCK, &pctx); 488 return 0; 489 } 490 ext2fs_mark_block_bitmap2(ctx->block_found_map, blk); 491 skip_new_block: 492 ext2fs_block_alloc_stats2(fs, blk, +1); 493 494 /* 495 * Next find a free inode. 496 */ 497 retval = ext2fs_new_inode(fs, EXT2_ROOT_INO, 040700, 498 ctx->inode_used_map, &ino); 499 if (retval == EXT2_ET_INODE_ALLOC_FAIL && 500 fix_problem(ctx, PR_3_LPF_NO_SPACE, &pctx)) { 501 fix_problem(ctx, PR_3_NO_SPACE_TO_RECOVER, &pctx); 502 ctx->lost_and_found = EXT2_ROOT_INO; 503 return 0; 504 } 505 if (retval) { 506 pctx.errcode = retval; 507 fix_problem(ctx, PR_3_ERR_LPF_NEW_INODE, &pctx); 508 return 0; 509 } 510 ext2fs_mark_inode_bitmap2(ctx->inode_used_map, ino); 511 ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, ino); 512 ext2fs_inode_alloc_stats2(fs, ino, +1, 1); 513 514 /* 515 * Set up the inode structure 516 */ 517 memset(&inode, 0, sizeof(inode)); 518 inode.i_mode = 040700; 519 inode.i_size = fs->blocksize; 520 inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now; 521 inode.i_links_count = 2; 522 ext2fs_iblk_set(fs, EXT2_INODE(&inode), 1); 523 inode.i_block[0] = blk; 524 525 /* 526 * Next, write out the inode. 527 */ 528 pctx.errcode = ext2fs_write_new_inode(fs, ino, EXT2_INODE(&inode)); 529 if (pctx.errcode) { 530 pctx.str = "ext2fs_write_inode"; 531 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); 532 return 0; 533 } 534 535 /* 536 * Now let's create the actual data block for the inode. 537 * Due to metadata_csum, the directory block MUST be written 538 * after the inode is written to disk! 539 */ 540 retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block); 541 if (retval) { 542 pctx.errcode = retval; 543 fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx); 544 return 0; 545 } 546 547 retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino); 548 ext2fs_free_mem(&block); 549 if (retval) { 550 pctx.errcode = retval; 551 fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx); 552 return 0; 553 } 554 555 /* 556 * Finally, create the directory link 557 */ 558 pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, EXT2_FT_DIR); 559 if (pctx.errcode == EXT2_ET_DIR_NO_SPACE) { 560 pctx.errcode = ext2fs_expand_dir(fs, EXT2_ROOT_INO); 561 if (pctx.errcode) 562 goto link_error; 563 pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, 564 EXT2_FT_DIR); 565 } 566 if (pctx.errcode) { 567 link_error: 568 pctx.str = "ext2fs_link"; 569 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); 570 return 0; 571 } 572 573 /* 574 * Miscellaneous bookkeeping that needs to be kept straight. 575 */ 576 e2fsck_add_dir_info(ctx, ino, EXT2_ROOT_INO); 577 e2fsck_adjust_inode_count(ctx, EXT2_ROOT_INO, 1); 578 ext2fs_icount_store(ctx->inode_count, ino, 2); 579 ext2fs_icount_store(ctx->inode_link_info, ino, 2); 580 ctx->lost_and_found = ino; 581 quota_data_add(ctx->qctx, &inode, ino, fs->blocksize); 582 quota_data_inodes(ctx->qctx, &inode, ino, +1); 583 #if 0 584 printf("/lost+found created; inode #%lu\n", ino); 585 #endif 586 return ino; 587 } 588 589 /* 590 * This routine will connect a file to lost+found 591 */ 592 int e2fsck_reconnect_file(e2fsck_t ctx, ext2_ino_t ino) 593 { 594 ext2_filsys fs = ctx->fs; 595 errcode_t retval; 596 char name[80]; 597 struct problem_context pctx; 598 struct ext2_inode inode; 599 int file_type = 0; 600 601 clear_problem_context(&pctx); 602 pctx.ino = ino; 603 604 if (!ctx->bad_lost_and_found && !ctx->lost_and_found) { 605 if (e2fsck_get_lost_and_found(ctx, 1) == 0) 606 ctx->bad_lost_and_found++; 607 } 608 if (ctx->bad_lost_and_found) { 609 fix_problem(ctx, PR_3_NO_LPF, &pctx); 610 return 1; 611 } 612 613 sprintf(name, "#%u", ino); 614 if (ext2fs_read_inode(fs, ino, &inode) == 0) 615 file_type = ext2_file_type(inode.i_mode); 616 retval = ext2fs_link(fs, ctx->lost_and_found, name, ino, file_type); 617 if (retval == EXT2_ET_DIR_NO_SPACE) { 618 if (!fix_problem(ctx, PR_3_EXPAND_LF_DIR, &pctx)) 619 return 1; 620 retval = e2fsck_expand_directory(ctx, ctx->lost_and_found, 621 1, 0); 622 if (retval) { 623 pctx.errcode = retval; 624 fix_problem(ctx, PR_3_CANT_EXPAND_LPF, &pctx); 625 return 1; 626 } 627 retval = ext2fs_link(fs, ctx->lost_and_found, name, 628 ino, file_type); 629 } 630 if (retval) { 631 pctx.errcode = retval; 632 fix_problem(ctx, PR_3_CANT_RECONNECT, &pctx); 633 return 1; 634 } 635 e2fsck_adjust_inode_count(ctx, ino, 1); 636 637 return 0; 638 } 639 640 /* 641 * Utility routine to adjust the inode counts on an inode. 642 */ 643 errcode_t e2fsck_adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj) 644 { 645 ext2_filsys fs = ctx->fs; 646 errcode_t retval; 647 struct ext2_inode inode; 648 649 if (!ino) 650 return 0; 651 652 retval = ext2fs_read_inode(fs, ino, &inode); 653 if (retval) 654 return retval; 655 656 #if 0 657 printf("Adjusting link count for inode %lu by %d (from %d)\n", ino, adj, 658 inode.i_links_count); 659 #endif 660 661 if (adj == 1) { 662 ext2fs_icount_increment(ctx->inode_count, ino, 0); 663 if (inode.i_links_count == (__u16) ~0) 664 return 0; 665 ext2fs_icount_increment(ctx->inode_link_info, ino, 0); 666 inode.i_links_count++; 667 } else if (adj == -1) { 668 ext2fs_icount_decrement(ctx->inode_count, ino, 0); 669 if (inode.i_links_count == 0) 670 return 0; 671 ext2fs_icount_decrement(ctx->inode_link_info, ino, 0); 672 inode.i_links_count--; 673 } 674 675 retval = ext2fs_write_inode(fs, ino, &inode); 676 if (retval) 677 return retval; 678 679 return 0; 680 } 681 682 /* 683 * Fix parent --- this routine fixes up the parent of a directory. 684 */ 685 struct fix_dotdot_struct { 686 ext2_filsys fs; 687 ext2_ino_t parent; 688 int done; 689 e2fsck_t ctx; 690 }; 691 692 static int fix_dotdot_proc(struct ext2_dir_entry *dirent, 693 int offset EXT2FS_ATTR((unused)), 694 int blocksize EXT2FS_ATTR((unused)), 695 char *buf EXT2FS_ATTR((unused)), 696 void *priv_data) 697 { 698 struct fix_dotdot_struct *fp = (struct fix_dotdot_struct *) priv_data; 699 errcode_t retval; 700 struct problem_context pctx; 701 702 if (ext2fs_dirent_name_len(dirent) != 2) 703 return 0; 704 if (strncmp(dirent->name, "..", 2)) 705 return 0; 706 707 clear_problem_context(&pctx); 708 709 retval = e2fsck_adjust_inode_count(fp->ctx, dirent->inode, -1); 710 if (retval) { 711 pctx.errcode = retval; 712 fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); 713 } 714 retval = e2fsck_adjust_inode_count(fp->ctx, fp->parent, 1); 715 if (retval) { 716 pctx.errcode = retval; 717 fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); 718 } 719 dirent->inode = fp->parent; 720 if (ext2fs_has_feature_filetype(fp->ctx->fs->super)) 721 ext2fs_dirent_set_file_type(dirent, EXT2_FT_DIR); 722 else 723 ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN); 724 725 fp->done++; 726 return DIRENT_ABORT | DIRENT_CHANGED; 727 } 728 729 static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent) 730 { 731 ext2_filsys fs = ctx->fs; 732 errcode_t retval; 733 struct fix_dotdot_struct fp; 734 struct problem_context pctx; 735 int flags, will_rehash; 736 737 fp.fs = fs; 738 fp.parent = parent; 739 fp.done = 0; 740 fp.ctx = ctx; 741 742 #if 0 743 printf("Fixing '..' of inode %lu to be %lu...\n", ino, parent); 744 #endif 745 746 clear_problem_context(&pctx); 747 pctx.ino = ino; 748 will_rehash = e2fsck_dir_will_be_rehashed(ctx, ino); 749 if (will_rehash) { 750 flags = ctx->fs->flags; 751 ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS; 752 } 753 retval = ext2fs_dir_iterate(fs, ino, DIRENT_FLAG_INCLUDE_EMPTY, 754 0, fix_dotdot_proc, &fp); 755 if (will_rehash) 756 ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) | 757 (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS); 758 if (retval || !fp.done) { 759 pctx.errcode = retval; 760 fix_problem(ctx, retval ? PR_3_FIX_PARENT_ERR : 761 PR_3_FIX_PARENT_NOFIND, &pctx); 762 ext2fs_unmark_valid(fs); 763 } 764 (void) e2fsck_dir_info_set_dotdot(ctx, ino, parent); 765 if (e2fsck_dir_info_set_parent(ctx, ino, ctx->lost_and_found)) 766 fix_problem(ctx, PR_3_NO_DIRINFO, &pctx); 767 768 return; 769 } 770 771 /* 772 * These routines are responsible for expanding a /lost+found if it is 773 * too small. 774 */ 775 776 struct expand_dir_struct { 777 blk64_t num; 778 e2_blkcnt_t guaranteed_size; 779 blk64_t newblocks; 780 blk64_t last_block; 781 errcode_t err; 782 e2fsck_t ctx; 783 ext2_ino_t dir; 784 }; 785 786 static int expand_dir_proc(ext2_filsys fs, 787 blk64_t *blocknr, 788 e2_blkcnt_t blockcnt, 789 blk64_t ref_block EXT2FS_ATTR((unused)), 790 int ref_offset EXT2FS_ATTR((unused)), 791 void *priv_data) 792 { 793 struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data; 794 blk64_t new_blk; 795 static blk64_t last_blk = 0; 796 char *block; 797 errcode_t retval; 798 e2fsck_t ctx; 799 800 ctx = es->ctx; 801 802 if (es->guaranteed_size && blockcnt >= es->guaranteed_size) 803 return BLOCK_ABORT; 804 805 if (blockcnt > 0) 806 es->last_block = blockcnt; 807 if (*blocknr) { 808 last_blk = *blocknr; 809 return 0; 810 } 811 812 if (blockcnt && 813 (EXT2FS_B2C(fs, last_blk) == EXT2FS_B2C(fs, last_blk + 1))) 814 new_blk = last_blk + 1; 815 else { 816 last_blk &= ~EXT2FS_CLUSTER_MASK(fs); 817 retval = ext2fs_new_block2(fs, last_blk, ctx->block_found_map, 818 &new_blk); 819 if (retval) { 820 es->err = retval; 821 return BLOCK_ABORT; 822 } 823 es->newblocks++; 824 ext2fs_block_alloc_stats2(fs, new_blk, +1); 825 } 826 last_blk = new_blk; 827 828 if (blockcnt > 0) { 829 retval = ext2fs_new_dir_block(fs, 0, 0, &block); 830 if (retval) { 831 es->err = retval; 832 return BLOCK_ABORT; 833 } 834 es->num--; 835 retval = ext2fs_write_dir_block4(fs, new_blk, block, 0, 836 es->dir); 837 ext2fs_free_mem(&block); 838 } else 839 retval = ext2fs_zero_blocks2(fs, new_blk, 1, NULL, NULL); 840 if (retval) { 841 es->err = retval; 842 return BLOCK_ABORT; 843 } 844 *blocknr = new_blk; 845 ext2fs_mark_block_bitmap2(ctx->block_found_map, new_blk); 846 847 if (es->num == 0) 848 return (BLOCK_CHANGED | BLOCK_ABORT); 849 else 850 return BLOCK_CHANGED; 851 } 852 853 errcode_t e2fsck_expand_directory(e2fsck_t ctx, ext2_ino_t dir, 854 int num, int guaranteed_size) 855 { 856 ext2_filsys fs = ctx->fs; 857 errcode_t retval; 858 struct expand_dir_struct es; 859 struct ext2_inode_large inode; 860 blk64_t sz; 861 862 if (!(fs->flags & EXT2_FLAG_RW)) 863 return EXT2_ET_RO_FILSYS; 864 865 /* 866 * Read the inode and block bitmaps in; we'll be messing with 867 * them. 868 */ 869 e2fsck_read_bitmaps(ctx); 870 871 retval = ext2fs_check_directory(fs, dir); 872 if (retval) 873 return retval; 874 875 es.num = num; 876 es.guaranteed_size = guaranteed_size; 877 es.last_block = 0; 878 es.err = 0; 879 es.newblocks = 0; 880 es.ctx = ctx; 881 es.dir = dir; 882 883 retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND, 884 0, expand_dir_proc, &es); 885 886 if (es.err) 887 return es.err; 888 889 /* 890 * Update the size and block count fields in the inode. 891 */ 892 retval = ext2fs_read_inode_full(fs, dir, 893 EXT2_INODE(&inode), sizeof(inode)); 894 if (retval) 895 return retval; 896 897 sz = (es.last_block + 1) * fs->blocksize; 898 retval = ext2fs_inode_size_set(fs, EXT2_INODE(&inode), sz); 899 if (retval) 900 return retval; 901 ext2fs_iblk_add_blocks(fs, EXT2_INODE(&inode), es.newblocks); 902 quota_data_add(ctx->qctx, &inode, dir, es.newblocks * fs->blocksize); 903 904 e2fsck_write_inode_full(ctx, dir, EXT2_INODE(&inode), 905 sizeof(inode), "expand_directory"); 906 907 return 0; 908 } 909 910
