1 /* 2 * e2fsck.c - superblock checks 3 * 4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 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 12 #ifdef HAVE_ERRNO_H 13 #include <errno.h> 14 #endif 15 16 #ifndef EXT2_SKIP_UUID 17 #include "uuid/uuid.h" 18 #endif 19 #include "e2fsck.h" 20 #include "problem.h" 21 22 #define MIN_CHECK 1 23 #define MAX_CHECK 2 24 25 static void check_super_value(e2fsck_t ctx, const char *descr, 26 unsigned long value, int flags, 27 unsigned long min_val, unsigned long max_val) 28 { 29 struct problem_context pctx; 30 31 if (((flags & MIN_CHECK) && (value < min_val)) || 32 ((flags & MAX_CHECK) && (value > max_val))) { 33 clear_problem_context(&pctx); 34 pctx.num = value; 35 pctx.str = descr; 36 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); 37 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */ 38 } 39 } 40 41 /* 42 * helper function to release an inode 43 */ 44 struct process_block_struct { 45 e2fsck_t ctx; 46 char *buf; 47 struct problem_context *pctx; 48 int truncating; 49 int truncate_offset; 50 e2_blkcnt_t truncate_block; 51 int truncated_blocks; 52 int abort; 53 errcode_t errcode; 54 }; 55 56 static int release_inode_block(ext2_filsys fs, 57 blk_t *block_nr, 58 e2_blkcnt_t blockcnt, 59 blk_t ref_blk EXT2FS_ATTR((unused)), 60 int ref_offset EXT2FS_ATTR((unused)), 61 void *priv_data) 62 { 63 struct process_block_struct *pb; 64 e2fsck_t ctx; 65 struct problem_context *pctx; 66 blk_t blk = *block_nr; 67 int retval = 0; 68 69 pb = (struct process_block_struct *) priv_data; 70 ctx = pb->ctx; 71 pctx = pb->pctx; 72 73 pctx->blk = blk; 74 pctx->blkcount = blockcnt; 75 76 if (HOLE_BLKADDR(blk)) 77 return 0; 78 79 if ((blk < fs->super->s_first_data_block) || 80 (blk >= fs->super->s_blocks_count)) { 81 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx); 82 return_abort: 83 pb->abort = 1; 84 return BLOCK_ABORT; 85 } 86 87 if (!ext2fs_test_block_bitmap(fs->block_map, blk)) { 88 fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx); 89 goto return_abort; 90 } 91 92 /* 93 * If we are deleting an orphan, then we leave the fields alone. 94 * If we are truncating an orphan, then update the inode fields 95 * and clean up any partial block data. 96 */ 97 if (pb->truncating) { 98 /* 99 * We only remove indirect blocks if they are 100 * completely empty. 101 */ 102 if (blockcnt < 0) { 103 int i, limit; 104 blk_t *bp; 105 106 pb->errcode = io_channel_read_blk(fs->io, blk, 1, 107 pb->buf); 108 if (pb->errcode) 109 goto return_abort; 110 111 limit = fs->blocksize >> 2; 112 for (i = 0, bp = (blk_t *) pb->buf; 113 i < limit; i++, bp++) 114 if (*bp) 115 return 0; 116 } 117 /* 118 * We don't remove direct blocks until we've reached 119 * the truncation block. 120 */ 121 if (blockcnt >= 0 && blockcnt < pb->truncate_block) 122 return 0; 123 /* 124 * If part of the last block needs truncating, we do 125 * it here. 126 */ 127 if ((blockcnt == pb->truncate_block) && pb->truncate_offset) { 128 pb->errcode = io_channel_read_blk(fs->io, blk, 1, 129 pb->buf); 130 if (pb->errcode) 131 goto return_abort; 132 memset(pb->buf + pb->truncate_offset, 0, 133 fs->blocksize - pb->truncate_offset); 134 pb->errcode = io_channel_write_blk(fs->io, blk, 1, 135 pb->buf); 136 if (pb->errcode) 137 goto return_abort; 138 } 139 pb->truncated_blocks++; 140 *block_nr = 0; 141 retval |= BLOCK_CHANGED; 142 } 143 144 ext2fs_block_alloc_stats(fs, blk, -1); 145 return retval; 146 } 147 148 /* 149 * This function releases an inode. Returns 1 if an inconsistency was 150 * found. If the inode has a link count, then it is being truncated and 151 * not deleted. 152 */ 153 static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino, 154 struct ext2_inode *inode, char *block_buf, 155 struct problem_context *pctx) 156 { 157 struct process_block_struct pb; 158 ext2_filsys fs = ctx->fs; 159 errcode_t retval; 160 __u32 count; 161 162 if (!ext2fs_inode_has_valid_blocks(inode)) 163 return 0; 164 165 pb.buf = block_buf + 3 * ctx->fs->blocksize; 166 pb.ctx = ctx; 167 pb.abort = 0; 168 pb.errcode = 0; 169 pb.pctx = pctx; 170 if (inode->i_links_count) { 171 pb.truncating = 1; 172 pb.truncate_block = (e2_blkcnt_t) 173 ((((long long)inode->i_size_high << 32) + 174 inode->i_size + fs->blocksize - 1) / 175 fs->blocksize); 176 pb.truncate_offset = inode->i_size % fs->blocksize; 177 } else { 178 pb.truncating = 0; 179 pb.truncate_block = 0; 180 pb.truncate_offset = 0; 181 } 182 pb.truncated_blocks = 0; 183 retval = ext2fs_block_iterate2(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE, 184 block_buf, release_inode_block, &pb); 185 if (retval) { 186 com_err("release_inode_blocks", retval, 187 _("while calling ext2fs_block_iterate for inode %d"), 188 ino); 189 return 1; 190 } 191 if (pb.abort) 192 return 1; 193 194 /* Refresh the inode since ext2fs_block_iterate may have changed it */ 195 e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks"); 196 197 if (pb.truncated_blocks) 198 ext2fs_iblk_sub_blocks(fs, inode, pb.truncated_blocks); 199 200 if (inode->i_file_acl) { 201 retval = ext2fs_adjust_ea_refcount(fs, inode->i_file_acl, 202 block_buf, -1, &count); 203 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) { 204 retval = 0; 205 count = 1; 206 } 207 if (retval) { 208 com_err("release_inode_blocks", retval, 209 _("while calling ext2fs_adjust_ea_refcount for inode %d"), 210 ino); 211 return 1; 212 } 213 if (count == 0) 214 ext2fs_block_alloc_stats(fs, inode->i_file_acl, -1); 215 inode->i_file_acl = 0; 216 } 217 return 0; 218 } 219 220 /* 221 * This function releases all of the orphan inodes. It returns 1 if 222 * it hit some error, and 0 on success. 223 */ 224 static int release_orphan_inodes(e2fsck_t ctx) 225 { 226 ext2_filsys fs = ctx->fs; 227 ext2_ino_t ino, next_ino; 228 struct ext2_inode inode; 229 struct problem_context pctx; 230 char *block_buf; 231 232 if ((ino = fs->super->s_last_orphan) == 0) 233 return 0; 234 235 /* 236 * Win or lose, we won't be using the head of the orphan inode 237 * list again. 238 */ 239 fs->super->s_last_orphan = 0; 240 ext2fs_mark_super_dirty(fs); 241 242 /* 243 * If the filesystem contains errors, don't run the orphan 244 * list, since the orphan list can't be trusted; and we're 245 * going to be running a full e2fsck run anyway... 246 */ 247 if (fs->super->s_state & EXT2_ERROR_FS) 248 return 0; 249 250 if ((ino < EXT2_FIRST_INODE(fs->super)) || 251 (ino > fs->super->s_inodes_count)) { 252 clear_problem_context(&pctx); 253 pctx.ino = ino; 254 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx); 255 return 1; 256 } 257 258 block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4, 259 "block iterate buffer"); 260 e2fsck_read_bitmaps(ctx); 261 262 while (ino) { 263 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes"); 264 clear_problem_context(&pctx); 265 pctx.ino = ino; 266 pctx.inode = &inode; 267 pctx.str = inode.i_links_count ? _("Truncating") : 268 _("Clearing"); 269 270 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx); 271 272 next_ino = inode.i_dtime; 273 if (next_ino && 274 ((next_ino < EXT2_FIRST_INODE(fs->super)) || 275 (next_ino > fs->super->s_inodes_count))) { 276 pctx.ino = next_ino; 277 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx); 278 goto return_abort; 279 } 280 281 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx)) 282 goto return_abort; 283 284 if (!inode.i_links_count) { 285 ext2fs_inode_alloc_stats2(fs, ino, -1, 286 LINUX_S_ISDIR(inode.i_mode)); 287 inode.i_dtime = ctx->now; 288 } else { 289 inode.i_dtime = 0; 290 } 291 e2fsck_write_inode(ctx, ino, &inode, "delete_file"); 292 ino = next_ino; 293 } 294 ext2fs_free_mem(&block_buf); 295 return 0; 296 return_abort: 297 ext2fs_free_mem(&block_buf); 298 return 1; 299 } 300 301 /* 302 * Check the resize inode to make sure it is sane. We check both for 303 * the case where on-line resizing is not enabled (in which case the 304 * resize inode should be cleared) as well as the case where on-line 305 * resizing is enabled. 306 */ 307 void check_resize_inode(e2fsck_t ctx) 308 { 309 ext2_filsys fs = ctx->fs; 310 struct ext2_inode inode; 311 struct problem_context pctx; 312 int i, gdt_off, ind_off; 313 dgrp_t j; 314 blk_t blk, pblk, expect; 315 __u32 *dind_buf = 0, *ind_buf; 316 errcode_t retval; 317 318 clear_problem_context(&pctx); 319 320 /* 321 * If the resize inode feature isn't set, then 322 * s_reserved_gdt_blocks must be zero. 323 */ 324 if (!(fs->super->s_feature_compat & 325 EXT2_FEATURE_COMPAT_RESIZE_INODE)) { 326 if (fs->super->s_reserved_gdt_blocks) { 327 pctx.num = fs->super->s_reserved_gdt_blocks; 328 if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS, 329 &pctx)) { 330 fs->super->s_reserved_gdt_blocks = 0; 331 ext2fs_mark_super_dirty(fs); 332 } 333 } 334 } 335 336 /* Read the resize inode */ 337 pctx.ino = EXT2_RESIZE_INO; 338 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode); 339 if (retval) { 340 if (fs->super->s_feature_compat & 341 EXT2_FEATURE_COMPAT_RESIZE_INODE) 342 ctx->flags |= E2F_FLAG_RESIZE_INODE; 343 return; 344 } 345 346 /* 347 * If the resize inode feature isn't set, check to make sure 348 * the resize inode is cleared; then we're done. 349 */ 350 if (!(fs->super->s_feature_compat & 351 EXT2_FEATURE_COMPAT_RESIZE_INODE)) { 352 for (i=0; i < EXT2_N_BLOCKS; i++) { 353 if (inode.i_block[i]) 354 break; 355 } 356 if ((i < EXT2_N_BLOCKS) && 357 fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) { 358 memset(&inode, 0, sizeof(inode)); 359 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, 360 "clear_resize"); 361 } 362 return; 363 } 364 365 /* 366 * The resize inode feature is enabled; check to make sure the 367 * only block in use is the double indirect block 368 */ 369 blk = inode.i_block[EXT2_DIND_BLOCK]; 370 for (i=0; i < EXT2_N_BLOCKS; i++) { 371 if (i != EXT2_DIND_BLOCK && inode.i_block[i]) 372 break; 373 } 374 if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count || 375 !(inode.i_mode & LINUX_S_IFREG) || 376 (blk < fs->super->s_first_data_block || 377 blk >= fs->super->s_blocks_count)) { 378 resize_inode_invalid: 379 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) { 380 memset(&inode, 0, sizeof(inode)); 381 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, 382 "clear_resize"); 383 ctx->flags |= E2F_FLAG_RESIZE_INODE; 384 } 385 if (!(ctx->options & E2F_OPT_READONLY)) { 386 fs->super->s_state &= ~EXT2_VALID_FS; 387 ext2fs_mark_super_dirty(fs); 388 } 389 goto cleanup; 390 } 391 dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2, 392 "resize dind buffer"); 393 ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize); 394 395 retval = ext2fs_read_ind_block(fs, blk, dind_buf); 396 if (retval) 397 goto resize_inode_invalid; 398 399 gdt_off = fs->desc_blocks; 400 pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks; 401 for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4; 402 i++, gdt_off++, pblk++) { 403 gdt_off %= fs->blocksize/4; 404 if (dind_buf[gdt_off] != pblk) 405 goto resize_inode_invalid; 406 retval = ext2fs_read_ind_block(fs, pblk, ind_buf); 407 if (retval) 408 goto resize_inode_invalid; 409 ind_off = 0; 410 for (j = 1; j < fs->group_desc_count; j++) { 411 if (!ext2fs_bg_has_super(fs, j)) 412 continue; 413 expect = pblk + (j * fs->super->s_blocks_per_group); 414 if (ind_buf[ind_off] != expect) 415 goto resize_inode_invalid; 416 ind_off++; 417 } 418 } 419 420 cleanup: 421 if (dind_buf) 422 ext2fs_free_mem(&dind_buf); 423 424 } 425 426 /* 427 * This function checks the dirhash signed/unsigned hint if necessary. 428 */ 429 static void e2fsck_fix_dirhash_hint(e2fsck_t ctx) 430 { 431 struct ext2_super_block *sb = ctx->fs->super; 432 struct problem_context pctx; 433 char c; 434 435 if ((ctx->options & E2F_OPT_READONLY) || 436 !(sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) || 437 (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH))) 438 return; 439 440 c = (char) 255; 441 442 clear_problem_context(&pctx); 443 if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) { 444 if (((int) c) == -1) { 445 sb->s_flags |= EXT2_FLAGS_SIGNED_HASH; 446 } else { 447 sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH; 448 } 449 ext2fs_mark_super_dirty(ctx->fs); 450 } 451 } 452 453 454 void check_super_block(e2fsck_t ctx) 455 { 456 ext2_filsys fs = ctx->fs; 457 blk_t first_block, last_block; 458 struct ext2_super_block *sb = fs->super; 459 struct ext2_group_desc *gd; 460 problem_t problem; 461 blk_t blocks_per_group = fs->super->s_blocks_per_group; 462 blk_t bpg_max; 463 int inodes_per_block; 464 int ipg_max; 465 int inode_size; 466 int accept_time_fudge; 467 dgrp_t i; 468 blk_t should_be; 469 struct problem_context pctx; 470 blk_t free_blocks = 0; 471 ino_t free_inodes = 0; 472 int csum_flag, clear_test_fs_flag; 473 474 inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super); 475 ipg_max = inodes_per_block * (blocks_per_group - 4); 476 if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb)) 477 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb); 478 bpg_max = 8 * EXT2_BLOCK_SIZE(sb); 479 if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb)) 480 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb); 481 482 ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx, 483 sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap"); 484 ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx, 485 sizeof(int) * fs->group_desc_count, "invalid_block_bitmap"); 486 ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx, 487 sizeof(int) * fs->group_desc_count, "invalid_inode_table"); 488 489 clear_problem_context(&pctx); 490 491 /* 492 * Verify the super block constants... 493 */ 494 check_super_value(ctx, "inodes_count", sb->s_inodes_count, 495 MIN_CHECK, 1, 0); 496 check_super_value(ctx, "blocks_count", sb->s_blocks_count, 497 MIN_CHECK, 1, 0); 498 check_super_value(ctx, "first_data_block", sb->s_first_data_block, 499 MAX_CHECK, 0, sb->s_blocks_count); 500 check_super_value(ctx, "log_block_size", sb->s_log_block_size, 501 MIN_CHECK | MAX_CHECK, 0, 502 EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE); 503 check_super_value(ctx, "log_frag_size", sb->s_log_frag_size, 504 MIN_CHECK | MAX_CHECK, 0, sb->s_log_block_size); 505 check_super_value(ctx, "frags_per_group", sb->s_frags_per_group, 506 MIN_CHECK | MAX_CHECK, sb->s_blocks_per_group, 507 bpg_max); 508 check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group, 509 MIN_CHECK | MAX_CHECK, 8, bpg_max); 510 check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group, 511 MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max); 512 check_super_value(ctx, "r_blocks_count", sb->s_r_blocks_count, 513 MAX_CHECK, 0, sb->s_blocks_count / 2); 514 check_super_value(ctx, "reserved_gdt_blocks", 515 sb->s_reserved_gdt_blocks, MAX_CHECK, 0, 516 fs->blocksize/4); 517 if (sb->s_rev_level > EXT2_GOOD_OLD_REV) 518 check_super_value(ctx, "first_ino", sb->s_first_ino, 519 MIN_CHECK | MAX_CHECK, 520 EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count); 521 inode_size = EXT2_INODE_SIZE(sb); 522 check_super_value(ctx, "inode_size", 523 inode_size, MIN_CHECK | MAX_CHECK, 524 EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize); 525 if (inode_size & (inode_size - 1)) { 526 pctx.num = inode_size; 527 pctx.str = "inode_size"; 528 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); 529 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */ 530 return; 531 } 532 533 if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) && 534 (ctx->num_blocks < sb->s_blocks_count)) { 535 pctx.blk = sb->s_blocks_count; 536 pctx.blk2 = ctx->num_blocks; 537 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) { 538 ctx->flags |= E2F_FLAG_ABORT; 539 return; 540 } 541 } 542 543 if (sb->s_log_block_size != (__u32) sb->s_log_frag_size) { 544 pctx.blk = EXT2_BLOCK_SIZE(sb); 545 pctx.blk2 = EXT2_FRAG_SIZE(sb); 546 fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx); 547 ctx->flags |= E2F_FLAG_ABORT; 548 return; 549 } 550 551 should_be = sb->s_frags_per_group >> 552 (sb->s_log_block_size - sb->s_log_frag_size); 553 if (sb->s_blocks_per_group != should_be) { 554 pctx.blk = sb->s_blocks_per_group; 555 pctx.blk2 = should_be; 556 fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx); 557 ctx->flags |= E2F_FLAG_ABORT; 558 return; 559 } 560 561 should_be = (sb->s_log_block_size == 0) ? 1 : 0; 562 if (sb->s_first_data_block != should_be) { 563 pctx.blk = sb->s_first_data_block; 564 pctx.blk2 = should_be; 565 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx); 566 ctx->flags |= E2F_FLAG_ABORT; 567 return; 568 } 569 570 should_be = sb->s_inodes_per_group * fs->group_desc_count; 571 if (sb->s_inodes_count != should_be) { 572 pctx.ino = sb->s_inodes_count; 573 pctx.ino2 = should_be; 574 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) { 575 sb->s_inodes_count = should_be; 576 ext2fs_mark_super_dirty(fs); 577 } 578 } 579 580 /* 581 * Verify the group descriptors.... 582 */ 583 first_block = sb->s_first_data_block; 584 last_block = sb->s_blocks_count-1; 585 586 csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 587 EXT4_FEATURE_RO_COMPAT_GDT_CSUM); 588 for (i = 0, gd=fs->group_desc; i < fs->group_desc_count; i++, gd++) { 589 pctx.group = i; 590 591 if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super, 592 EXT4_FEATURE_INCOMPAT_FLEX_BG)) { 593 first_block = ext2fs_group_first_block(fs, i); 594 last_block = ext2fs_group_last_block(fs, i); 595 } 596 597 if ((gd->bg_block_bitmap < first_block) || 598 (gd->bg_block_bitmap > last_block)) { 599 pctx.blk = gd->bg_block_bitmap; 600 if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx)) 601 gd->bg_block_bitmap = 0; 602 } 603 if (gd->bg_block_bitmap == 0) { 604 ctx->invalid_block_bitmap_flag[i]++; 605 ctx->invalid_bitmaps++; 606 } 607 if ((gd->bg_inode_bitmap < first_block) || 608 (gd->bg_inode_bitmap > last_block)) { 609 pctx.blk = gd->bg_inode_bitmap; 610 if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx)) 611 gd->bg_inode_bitmap = 0; 612 } 613 if (gd->bg_inode_bitmap == 0) { 614 ctx->invalid_inode_bitmap_flag[i]++; 615 ctx->invalid_bitmaps++; 616 } 617 if ((gd->bg_inode_table < first_block) || 618 ((gd->bg_inode_table + 619 fs->inode_blocks_per_group - 1) > last_block)) { 620 pctx.blk = gd->bg_inode_table; 621 if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx)) 622 gd->bg_inode_table = 0; 623 } 624 if (gd->bg_inode_table == 0) { 625 ctx->invalid_inode_table_flag[i]++; 626 ctx->invalid_bitmaps++; 627 } 628 free_blocks += gd->bg_free_blocks_count; 629 free_inodes += gd->bg_free_inodes_count; 630 631 if ((gd->bg_free_blocks_count > sb->s_blocks_per_group) || 632 (gd->bg_free_inodes_count > sb->s_inodes_per_group) || 633 (gd->bg_used_dirs_count > sb->s_inodes_per_group)) 634 ext2fs_unmark_valid(fs); 635 636 should_be = 0; 637 if (!ext2fs_group_desc_csum_verify(fs, i)) { 638 if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) { 639 gd->bg_flags &= ~(EXT2_BG_BLOCK_UNINIT | 640 EXT2_BG_INODE_UNINIT); 641 gd->bg_itable_unused = 0; 642 should_be = 1; 643 } 644 ext2fs_unmark_valid(fs); 645 } 646 647 if (!csum_flag && 648 (gd->bg_flags &(EXT2_BG_BLOCK_UNINIT|EXT2_BG_INODE_UNINIT)|| 649 gd->bg_itable_unused != 0)){ 650 if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) { 651 gd->bg_flags &= ~(EXT2_BG_BLOCK_UNINIT | 652 EXT2_BG_INODE_UNINIT); 653 gd->bg_itable_unused = 0; 654 should_be = 1; 655 } 656 ext2fs_unmark_valid(fs); 657 } 658 659 if (i == fs->group_desc_count - 1 && 660 gd->bg_flags & EXT2_BG_BLOCK_UNINIT) { 661 if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) { 662 gd->bg_flags &= ~EXT2_BG_BLOCK_UNINIT; 663 should_be = 1; 664 } 665 ext2fs_unmark_valid(fs); 666 } 667 668 if (gd->bg_flags & EXT2_BG_BLOCK_UNINIT && 669 !(gd->bg_flags & EXT2_BG_INODE_UNINIT)) { 670 if (fix_problem(ctx, PR_0_BB_UNINIT_IB_INIT, &pctx)) { 671 gd->bg_flags &= ~EXT2_BG_BLOCK_UNINIT; 672 should_be = 1; 673 } 674 ext2fs_unmark_valid(fs); 675 } 676 677 if (csum_flag && 678 (gd->bg_itable_unused > gd->bg_free_inodes_count || 679 gd->bg_itable_unused > sb->s_inodes_per_group)) { 680 pctx.blk = gd->bg_itable_unused; 681 if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) { 682 gd->bg_itable_unused = 0; 683 should_be = 1; 684 } 685 ext2fs_unmark_valid(fs); 686 } 687 688 if (should_be) 689 ext2fs_group_desc_csum_set(fs, i); 690 } 691 692 /* 693 * Update the global counts from the block group counts. This 694 * is needed for an experimental patch which eliminates 695 * locking the entire filesystem when allocating blocks or 696 * inodes; if the filesystem is not unmounted cleanly, the 697 * global counts may not be accurate. 698 */ 699 if ((free_blocks != sb->s_free_blocks_count) || 700 (free_inodes != sb->s_free_inodes_count)) { 701 if (ctx->options & E2F_OPT_READONLY) 702 ext2fs_unmark_valid(fs); 703 else { 704 sb->s_free_blocks_count = free_blocks; 705 sb->s_free_inodes_count = free_inodes; 706 ext2fs_mark_super_dirty(fs); 707 } 708 } 709 710 if ((sb->s_free_blocks_count > sb->s_blocks_count) || 711 (sb->s_free_inodes_count > sb->s_inodes_count)) 712 ext2fs_unmark_valid(fs); 713 714 715 /* 716 * If we have invalid bitmaps, set the error state of the 717 * filesystem. 718 */ 719 if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) { 720 sb->s_state &= ~EXT2_VALID_FS; 721 ext2fs_mark_super_dirty(fs); 722 } 723 724 clear_problem_context(&pctx); 725 726 #ifndef EXT2_SKIP_UUID 727 /* 728 * If the UUID field isn't assigned, assign it. 729 */ 730 if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) { 731 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) { 732 uuid_generate(sb->s_uuid); 733 ext2fs_mark_super_dirty(fs); 734 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 735 } 736 } 737 #endif 738 739 /* 740 * Check to see if we should disable the test_fs flag 741 */ 742 profile_get_boolean(ctx->profile, "options", 743 "clear_test_fs_flag", 0, 1, 744 &clear_test_fs_flag); 745 if (!(ctx->options & E2F_OPT_READONLY) && 746 clear_test_fs_flag && 747 (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) && 748 (fs_proc_check("ext4") || check_for_modules("ext4"))) { 749 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) { 750 fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS; 751 ext2fs_mark_super_dirty(fs); 752 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 753 } 754 } 755 756 /* 757 * For the Hurd, check to see if the filetype option is set, 758 * since it doesn't support it. 759 */ 760 if (!(ctx->options & E2F_OPT_READONLY) && 761 fs->super->s_creator_os == EXT2_OS_HURD && 762 (fs->super->s_feature_incompat & 763 EXT2_FEATURE_INCOMPAT_FILETYPE)) { 764 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) { 765 fs->super->s_feature_incompat &= 766 ~EXT2_FEATURE_INCOMPAT_FILETYPE; 767 ext2fs_mark_super_dirty(fs); 768 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 769 } 770 } 771 772 /* 773 * If we have any of the compatibility flags set, we need to have a 774 * revision 1 filesystem. Most kernels will not check the flags on 775 * a rev 0 filesystem and we may have corruption issues because of 776 * the incompatible changes to the filesystem. 777 */ 778 if (!(ctx->options & E2F_OPT_READONLY) && 779 fs->super->s_rev_level == EXT2_GOOD_OLD_REV && 780 (fs->super->s_feature_compat || 781 fs->super->s_feature_ro_compat || 782 fs->super->s_feature_incompat) && 783 fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) { 784 ext2fs_update_dynamic_rev(fs); 785 ext2fs_mark_super_dirty(fs); 786 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 787 } 788 789 /* 790 * Clean up any orphan inodes, if present. 791 */ 792 if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) { 793 fs->super->s_state &= ~EXT2_VALID_FS; 794 ext2fs_mark_super_dirty(fs); 795 } 796 797 /* 798 * Unfortunately, due to Windows' unfortunate design decision 799 * to configure the hardware clock to tick localtime, instead 800 * of the more proper and less error-prone UTC time, many 801 * users end up in the situation where the system clock is 802 * incorrectly set at the time when e2fsck is run. 803 * 804 * Historically this was usually due to some distributions 805 * having buggy init scripts and/or installers that didn't 806 * correctly detect this case and take appropriate 807 * countermeasures. However, it's still possible, despite the 808 * best efforts of init script and installer authors to not be 809 * able to detect this misconfiguration, usually due to a 810 * buggy or misconfigured virtualization manager or the 811 * installer not having access to a network time server during 812 * the installation process. So by default, we allow the 813 * superblock times to be fudged by up to 24 hours. This can 814 * be disabled by setting options.accept_time_fudge to the 815 * boolean value of false in e2fsck.conf. We also support 816 * options.buggy_init_scripts for backwards compatibility. 817 */ 818 profile_get_boolean(ctx->profile, "options", "accept_time_fudge", 819 0, 1, &accept_time_fudge); 820 profile_get_boolean(ctx->profile, "options", "buggy_init_scripts", 821 0, accept_time_fudge, &accept_time_fudge); 822 ctx->time_fudge = accept_time_fudge ? 86400 : 0; 823 824 /* 825 * Check to see if the superblock last mount time or last 826 * write time is in the future. 827 */ 828 if (fs->super->s_mtime > (__u32) ctx->now) { 829 pctx.num = fs->super->s_mtime; 830 problem = PR_0_FUTURE_SB_LAST_MOUNT; 831 if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge) 832 problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED; 833 if (fix_problem(ctx, problem, &pctx)) { 834 fs->super->s_mtime = ctx->now; 835 ext2fs_mark_super_dirty(fs); 836 } 837 } 838 if (fs->super->s_wtime > (__u32) ctx->now) { 839 pctx.num = fs->super->s_wtime; 840 problem = PR_0_FUTURE_SB_LAST_WRITE; 841 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge) 842 problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED; 843 if (fix_problem(ctx, problem, &pctx)) { 844 fs->super->s_wtime = ctx->now; 845 ext2fs_mark_super_dirty(fs); 846 } 847 } 848 849 /* 850 * Move the ext3 journal file, if necessary. 851 */ 852 e2fsck_move_ext3_journal(ctx); 853 854 /* 855 * Fix journal hint, if necessary 856 */ 857 e2fsck_fix_ext3_journal_hint(ctx); 858 859 /* 860 * Add dirhash hint if necessary 861 */ 862 e2fsck_fix_dirhash_hint(ctx); 863 864 return; 865 } 866 867 /* 868 * Check to see if we should backup the master sb to the backup super 869 * blocks. Returns non-zero if the sb should be backed up. 870 */ 871 872 /* 873 * A few flags are set on the fly by the kernel, but only in the 874 * primary superblock. This is actually a bad thing, and we should 875 * try to discourage it in the future. In particular, for the newer 876 * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and 877 * EXT3_FEATURE_INCOMPAT_EXTENTS. So some of these may go away in the 878 * future. EXT3_FEATURE_INCOMPAT_RECOVER may also get set when 879 * copying the primary superblock during online resize. 880 * 881 * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but 882 * unfortunately, we shouldn't ignore it since if it's not set in the 883 * backup, the extended attributes in the filesystem will be stripped 884 * away. 885 */ 886 #define FEATURE_RO_COMPAT_IGNORE (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 887 EXT4_FEATURE_RO_COMPAT_DIR_NLINK) 888 #define FEATURE_INCOMPAT_IGNORE (EXT3_FEATURE_INCOMPAT_EXTENTS| \ 889 EXT3_FEATURE_INCOMPAT_RECOVER) 890 891 int check_backup_super_block(e2fsck_t ctx) 892 { 893 ext2_filsys fs = ctx->fs; 894 errcode_t retval; 895 dgrp_t g; 896 blk_t sb; 897 int ret = 0; 898 char buf[SUPERBLOCK_SIZE]; 899 struct ext2_super_block *backup_sb; 900 901 /* 902 * If we are already writing out the backup blocks, then we 903 * don't need to test. Also, if the filesystem is invalid, or 904 * the check was aborted or cancelled, we also don't want to 905 * do the backup. If the filesystem was opened read-only then 906 * we can't do the backup. 907 */ 908 if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) || 909 !ext2fs_test_valid(fs) || 910 (fs->super->s_state & EXT2_ERROR_FS) || 911 (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) || 912 (ctx->options & E2F_OPT_READONLY)) 913 return 0; 914 915 for (g = 1; g < fs->group_desc_count; g++) { 916 if (!ext2fs_bg_has_super(fs, g)) 917 continue; 918 919 sb = fs->super->s_first_data_block + 920 (g * fs->super->s_blocks_per_group); 921 922 retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE, 923 buf); 924 if (retval) 925 continue; 926 backup_sb = (struct ext2_super_block *) buf; 927 #ifdef WORDS_BIGENDIAN 928 ext2fs_swap_super(backup_sb); 929 #endif 930 if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) || 931 (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) || 932 ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) > 933 EXT2_MAX_BLOCK_LOG_SIZE) || 934 (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE)) 935 continue; 936 937 #define SUPER_INCOMPAT_DIFFERENT(x) \ 938 ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) != \ 939 (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE)) 940 #define SUPER_RO_COMPAT_DIFFERENT(x) \ 941 ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) != \ 942 (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE)) 943 #define SUPER_DIFFERENT(x) \ 944 (fs->super->x != backup_sb->x) 945 946 if (SUPER_DIFFERENT(s_feature_compat) || 947 SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) || 948 SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) || 949 SUPER_DIFFERENT(s_blocks_count) || 950 SUPER_DIFFERENT(s_inodes_count) || 951 memcmp(fs->super->s_uuid, backup_sb->s_uuid, 952 sizeof(fs->super->s_uuid))) 953 ret = 1; 954 break; 955 } 956 return ret; 957 } 958
