super.c revision 11d1116a7c0b833af317249d12025413fecbcd70
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#include "config.h" 13#ifdef HAVE_ERRNO_H 14#include <errno.h> 15#endif 16 17#ifndef EXT2_SKIP_UUID 18#include "uuid/uuid.h" 19#endif 20#include "e2fsck.h" 21#include "problem.h" 22 23#define MIN_CHECK 1 24#define MAX_CHECK 2 25#define LOG2_CHECK 4 26 27static void check_super_value(e2fsck_t ctx, const char *descr, 28 unsigned long value, int flags, 29 unsigned long min_val, unsigned long max_val) 30{ 31 struct problem_context pctx; 32 33 if (((flags & MIN_CHECK) && (value < min_val)) || 34 ((flags & MAX_CHECK) && (value > max_val)) || 35 ((flags & LOG2_CHECK) && (value & (value - 1) != 0))) { 36 clear_problem_context(&pctx); 37 pctx.num = value; 38 pctx.str = descr; 39 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); 40 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */ 41 } 42} 43 44/* 45 * helper function to release an inode 46 */ 47struct process_block_struct { 48 e2fsck_t ctx; 49 char *buf; 50 struct problem_context *pctx; 51 int truncating; 52 int truncate_offset; 53 e2_blkcnt_t truncate_block; 54 int truncated_blocks; 55 int abort; 56 errcode_t errcode; 57}; 58 59static int release_inode_block(ext2_filsys fs, 60 blk64_t *block_nr, 61 e2_blkcnt_t blockcnt, 62 blk64_t ref_blk EXT2FS_ATTR((unused)), 63 int ref_offset EXT2FS_ATTR((unused)), 64 void *priv_data) 65{ 66 struct process_block_struct *pb; 67 e2fsck_t ctx; 68 struct problem_context *pctx; 69 blk64_t blk = *block_nr; 70 int retval = 0; 71 72 pb = (struct process_block_struct *) priv_data; 73 ctx = pb->ctx; 74 pctx = pb->pctx; 75 76 pctx->blk = blk; 77 pctx->blkcount = blockcnt; 78 79 if (HOLE_BLKADDR(blk)) 80 return 0; 81 82 if ((blk < fs->super->s_first_data_block) || 83 (blk >= ext2fs_blocks_count(fs->super))) { 84 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx); 85 return_abort: 86 pb->abort = 1; 87 return BLOCK_ABORT; 88 } 89 90 if (!ext2fs_test_block_bitmap2(fs->block_map, blk)) { 91 fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx); 92 goto return_abort; 93 } 94 95 /* 96 * If we are deleting an orphan, then we leave the fields alone. 97 * If we are truncating an orphan, then update the inode fields 98 * and clean up any partial block data. 99 */ 100 if (pb->truncating) { 101 /* 102 * We only remove indirect blocks if they are 103 * completely empty. 104 */ 105 if (blockcnt < 0) { 106 int i, limit; 107 blk_t *bp; 108 109 pb->errcode = io_channel_read_blk64(fs->io, blk, 1, 110 pb->buf); 111 if (pb->errcode) 112 goto return_abort; 113 114 limit = fs->blocksize >> 2; 115 for (i = 0, bp = (blk_t *) pb->buf; 116 i < limit; i++, bp++) 117 if (*bp) 118 return 0; 119 } 120 /* 121 * We don't remove direct blocks until we've reached 122 * the truncation block. 123 */ 124 if (blockcnt >= 0 && blockcnt < pb->truncate_block) 125 return 0; 126 /* 127 * If part of the last block needs truncating, we do 128 * it here. 129 */ 130 if ((blockcnt == pb->truncate_block) && pb->truncate_offset) { 131 pb->errcode = io_channel_read_blk64(fs->io, blk, 1, 132 pb->buf); 133 if (pb->errcode) 134 goto return_abort; 135 memset(pb->buf + pb->truncate_offset, 0, 136 fs->blocksize - pb->truncate_offset); 137 pb->errcode = io_channel_write_blk64(fs->io, blk, 1, 138 pb->buf); 139 if (pb->errcode) 140 goto return_abort; 141 } 142 pb->truncated_blocks++; 143 *block_nr = 0; 144 retval |= BLOCK_CHANGED; 145 } 146 147 ext2fs_block_alloc_stats2(fs, blk, -1); 148 ctx->free_blocks++; 149 return retval; 150} 151 152/* 153 * This function releases an inode. Returns 1 if an inconsistency was 154 * found. If the inode has a link count, then it is being truncated and 155 * not deleted. 156 */ 157static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino, 158 struct ext2_inode *inode, char *block_buf, 159 struct problem_context *pctx) 160{ 161 struct process_block_struct pb; 162 ext2_filsys fs = ctx->fs; 163 errcode_t retval; 164 __u32 count; 165 166 if (!ext2fs_inode_has_valid_blocks2(fs, inode)) 167 return 0; 168 169 pb.buf = block_buf + 3 * ctx->fs->blocksize; 170 pb.ctx = ctx; 171 pb.abort = 0; 172 pb.errcode = 0; 173 pb.pctx = pctx; 174 if (inode->i_links_count) { 175 pb.truncating = 1; 176 pb.truncate_block = (e2_blkcnt_t) 177 ((EXT2_I_SIZE(inode) + fs->blocksize - 1) / 178 fs->blocksize); 179 pb.truncate_offset = inode->i_size % fs->blocksize; 180 } else { 181 pb.truncating = 0; 182 pb.truncate_block = 0; 183 pb.truncate_offset = 0; 184 } 185 pb.truncated_blocks = 0; 186 retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE, 187 block_buf, release_inode_block, &pb); 188 if (retval) { 189 com_err("release_inode_blocks", retval, 190 _("while calling ext2fs_block_iterate for inode %d"), 191 ino); 192 return 1; 193 } 194 if (pb.abort) 195 return 1; 196 197 /* Refresh the inode since ext2fs_block_iterate may have changed it */ 198 e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks"); 199 200 if (pb.truncated_blocks) 201 ext2fs_iblk_sub_blocks(fs, inode, pb.truncated_blocks); 202 203 if (ext2fs_file_acl_block(fs, inode)) { 204 retval = ext2fs_adjust_ea_refcount2(fs, 205 ext2fs_file_acl_block(fs, inode), 206 block_buf, -1, &count); 207 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) { 208 retval = 0; 209 count = 1; 210 } 211 if (retval) { 212 com_err("release_inode_blocks", retval, 213 _("while calling ext2fs_adjust_ea_refcount2 for inode %d"), 214 ino); 215 return 1; 216 } 217 if (count == 0) { 218 ext2fs_block_alloc_stats2(fs, 219 ext2fs_file_acl_block(fs, inode), -1); 220 ctx->free_blocks++; 221 } 222 ext2fs_file_acl_block_set(fs, inode, 0); 223 } 224 return 0; 225} 226 227/* 228 * This function releases all of the orphan inodes. It returns 1 if 229 * it hit some error, and 0 on success. 230 */ 231static int release_orphan_inodes(e2fsck_t ctx) 232{ 233 ext2_filsys fs = ctx->fs; 234 ext2_ino_t ino, next_ino; 235 struct ext2_inode inode; 236 struct problem_context pctx; 237 char *block_buf; 238 239 if ((ino = fs->super->s_last_orphan) == 0) 240 return 0; 241 242 /* 243 * Win or lose, we won't be using the head of the orphan inode 244 * list again. 245 */ 246 fs->super->s_last_orphan = 0; 247 ext2fs_mark_super_dirty(fs); 248 249 /* 250 * If the filesystem contains errors, don't run the orphan 251 * list, since the orphan list can't be trusted; and we're 252 * going to be running a full e2fsck run anyway... 253 */ 254 if (fs->super->s_state & EXT2_ERROR_FS) 255 return 0; 256 257 if ((ino < EXT2_FIRST_INODE(fs->super)) || 258 (ino > fs->super->s_inodes_count)) { 259 clear_problem_context(&pctx); 260 pctx.ino = ino; 261 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx); 262 return 1; 263 } 264 265 block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4, 266 "block iterate buffer"); 267 e2fsck_read_bitmaps(ctx); 268 269 while (ino) { 270 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes"); 271 clear_problem_context(&pctx); 272 pctx.ino = ino; 273 pctx.inode = &inode; 274 pctx.str = inode.i_links_count ? _("Truncating") : 275 _("Clearing"); 276 277 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx); 278 279 next_ino = inode.i_dtime; 280 if (next_ino && 281 ((next_ino < EXT2_FIRST_INODE(fs->super)) || 282 (next_ino > fs->super->s_inodes_count))) { 283 pctx.ino = next_ino; 284 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx); 285 goto return_abort; 286 } 287 288 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx)) 289 goto return_abort; 290 291 if (!inode.i_links_count) { 292 ext2fs_inode_alloc_stats2(fs, ino, -1, 293 LINUX_S_ISDIR(inode.i_mode)); 294 ctx->free_inodes++; 295 inode.i_dtime = ctx->now; 296 } else { 297 inode.i_dtime = 0; 298 } 299 e2fsck_write_inode(ctx, ino, &inode, "delete_file"); 300 ino = next_ino; 301 } 302 ext2fs_free_mem(&block_buf); 303 return 0; 304return_abort: 305 ext2fs_free_mem(&block_buf); 306 return 1; 307} 308 309/* 310 * Check the resize inode to make sure it is sane. We check both for 311 * the case where on-line resizing is not enabled (in which case the 312 * resize inode should be cleared) as well as the case where on-line 313 * resizing is enabled. 314 */ 315void check_resize_inode(e2fsck_t ctx) 316{ 317 ext2_filsys fs = ctx->fs; 318 struct ext2_inode inode; 319 struct problem_context pctx; 320 int i, gdt_off, ind_off; 321 dgrp_t j; 322 blk_t blk, pblk; 323 blk_t expect; /* for resize inode, which is 32-bit only */ 324 __u32 *dind_buf = 0, *ind_buf; 325 errcode_t retval; 326 327 clear_problem_context(&pctx); 328 329 /* 330 * If the resize inode feature isn't set, then 331 * s_reserved_gdt_blocks must be zero. 332 */ 333 if (!(fs->super->s_feature_compat & 334 EXT2_FEATURE_COMPAT_RESIZE_INODE)) { 335 if (fs->super->s_reserved_gdt_blocks) { 336 pctx.num = fs->super->s_reserved_gdt_blocks; 337 if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS, 338 &pctx)) { 339 fs->super->s_reserved_gdt_blocks = 0; 340 ext2fs_mark_super_dirty(fs); 341 } 342 } 343 } 344 345 /* Read the resize inode */ 346 pctx.ino = EXT2_RESIZE_INO; 347 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode); 348 if (retval) { 349 if (fs->super->s_feature_compat & 350 EXT2_FEATURE_COMPAT_RESIZE_INODE) 351 ctx->flags |= E2F_FLAG_RESIZE_INODE; 352 return; 353 } 354 355 /* 356 * If the resize inode feature isn't set, check to make sure 357 * the resize inode is cleared; then we're done. 358 */ 359 if (!(fs->super->s_feature_compat & 360 EXT2_FEATURE_COMPAT_RESIZE_INODE)) { 361 for (i=0; i < EXT2_N_BLOCKS; i++) { 362 if (inode.i_block[i]) 363 break; 364 } 365 if ((i < EXT2_N_BLOCKS) && 366 fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) { 367 memset(&inode, 0, sizeof(inode)); 368 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, 369 "clear_resize"); 370 } 371 return; 372 } 373 374 /* 375 * The resize inode feature is enabled; check to make sure the 376 * only block in use is the double indirect block 377 */ 378 blk = inode.i_block[EXT2_DIND_BLOCK]; 379 for (i=0; i < EXT2_N_BLOCKS; i++) { 380 if (i != EXT2_DIND_BLOCK && inode.i_block[i]) 381 break; 382 } 383 if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count || 384 !(inode.i_mode & LINUX_S_IFREG) || 385 (blk < fs->super->s_first_data_block || 386 blk >= ext2fs_blocks_count(fs->super))) { 387 resize_inode_invalid: 388 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) { 389 memset(&inode, 0, sizeof(inode)); 390 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, 391 "clear_resize"); 392 ctx->flags |= E2F_FLAG_RESIZE_INODE; 393 } 394 if (!(ctx->options & E2F_OPT_READONLY)) { 395 fs->super->s_state &= ~EXT2_VALID_FS; 396 ext2fs_mark_super_dirty(fs); 397 } 398 goto cleanup; 399 } 400 dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2, 401 "resize dind buffer"); 402 ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize); 403 404 retval = ext2fs_read_ind_block(fs, blk, dind_buf); 405 if (retval) 406 goto resize_inode_invalid; 407 408 gdt_off = fs->desc_blocks; 409 pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks; 410 if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0) 411 pblk++; /* Deal with 1024 blocksize bigalloc fs */ 412 for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4; 413 i++, gdt_off++, pblk++) { 414 gdt_off %= fs->blocksize/4; 415 if (dind_buf[gdt_off] != pblk) 416 goto resize_inode_invalid; 417 retval = ext2fs_read_ind_block(fs, pblk, ind_buf); 418 if (retval) 419 goto resize_inode_invalid; 420 ind_off = 0; 421 for (j = 1; j < fs->group_desc_count; j++) { 422 if (!ext2fs_bg_has_super(fs, j)) 423 continue; 424 expect = pblk + (j * fs->super->s_blocks_per_group); 425 if (ind_buf[ind_off] != expect) 426 goto resize_inode_invalid; 427 ind_off++; 428 } 429 } 430 431cleanup: 432 if (dind_buf) 433 ext2fs_free_mem(&dind_buf); 434 435 } 436 437/* 438 * This function checks the dirhash signed/unsigned hint if necessary. 439 */ 440static void e2fsck_fix_dirhash_hint(e2fsck_t ctx) 441{ 442 struct ext2_super_block *sb = ctx->fs->super; 443 struct problem_context pctx; 444 char c; 445 446 if ((ctx->options & E2F_OPT_READONLY) || 447 !(sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) || 448 (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH))) 449 return; 450 451 c = (char) 255; 452 453 clear_problem_context(&pctx); 454 if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) { 455 if (((int) c) == -1) { 456 sb->s_flags |= EXT2_FLAGS_SIGNED_HASH; 457 } else { 458 sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH; 459 } 460 ext2fs_mark_super_dirty(ctx->fs); 461 } 462} 463 464 465void check_super_block(e2fsck_t ctx) 466{ 467 ext2_filsys fs = ctx->fs; 468 blk64_t first_block, last_block; 469 struct ext2_super_block *sb = fs->super; 470 unsigned int ipg_max; 471 problem_t problem; 472 blk64_t blocks_per_group = fs->super->s_blocks_per_group; 473 __u32 bpg_max, cpg_max; 474 int inodes_per_block; 475 int inode_size; 476 int accept_time_fudge; 477 int broken_system_clock; 478 dgrp_t i; 479 blk64_t should_be; 480 struct problem_context pctx; 481 blk64_t free_blocks = 0; 482 ino_t free_inodes = 0; 483 int csum_flag, clear_test_fs_flag; 484 485 inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super); 486 ipg_max = inodes_per_block * (blocks_per_group - 4); 487 if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb)) 488 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb); 489 cpg_max = 8 * EXT2_BLOCK_SIZE(sb); 490 if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb)) 491 cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb); 492 bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs); 493 if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb)) 494 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb); 495 496 ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx, 497 sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap"); 498 ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx, 499 sizeof(int) * fs->group_desc_count, "invalid_block_bitmap"); 500 ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx, 501 sizeof(int) * fs->group_desc_count, "invalid_inode_table"); 502 503 clear_problem_context(&pctx); 504 505 /* 506 * Verify the super block constants... 507 */ 508 check_super_value(ctx, "inodes_count", sb->s_inodes_count, 509 MIN_CHECK, 1, 0); 510 check_super_value(ctx, "blocks_count", ext2fs_blocks_count(sb), 511 MIN_CHECK, 1, 0); 512 check_super_value(ctx, "first_data_block", sb->s_first_data_block, 513 MAX_CHECK, 0, ext2fs_blocks_count(sb)); 514 check_super_value(ctx, "log_block_size", sb->s_log_block_size, 515 MIN_CHECK | MAX_CHECK, 0, 516 EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE); 517 check_super_value(ctx, "log_cluster_size", 518 sb->s_log_cluster_size, 519 MIN_CHECK | MAX_CHECK, sb->s_log_block_size, 520 (EXT2_MAX_CLUSTER_LOG_SIZE - 521 EXT2_MIN_CLUSTER_LOG_SIZE)); 522 check_super_value(ctx, "clusters_per_group", sb->s_clusters_per_group, 523 MIN_CHECK | MAX_CHECK, 8, cpg_max); 524 check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group, 525 MIN_CHECK | MAX_CHECK, 8, bpg_max); 526 check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group, 527 MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max); 528 check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb), 529 MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2); 530 check_super_value(ctx, "reserved_gdt_blocks", 531 sb->s_reserved_gdt_blocks, MAX_CHECK, 0, 532 fs->blocksize / sizeof(__u32)); 533 check_super_value(ctx, "desc_size", 534 sb->s_desc_size, MAX_CHECK | LOG2_CHECK, 0, 535 EXT2_MAX_DESC_SIZE); 536 if (sb->s_rev_level > EXT2_GOOD_OLD_REV) 537 check_super_value(ctx, "first_ino", sb->s_first_ino, 538 MIN_CHECK | MAX_CHECK, 539 EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count); 540 inode_size = EXT2_INODE_SIZE(sb); 541 check_super_value(ctx, "inode_size", 542 inode_size, MIN_CHECK | MAX_CHECK | LOG2_CHECK, 543 EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize); 544 if (sb->s_blocks_per_group != (sb->s_clusters_per_group * 545 EXT2FS_CLUSTER_RATIO(fs))) { 546 pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs); 547 pctx.str = "block_size"; 548 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); 549 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */ 550 return; 551 } 552 553 if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) && 554 (ctx->num_blocks < ext2fs_blocks_count(sb))) { 555 pctx.blk = ext2fs_blocks_count(sb); 556 pctx.blk2 = ctx->num_blocks; 557 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) { 558 ctx->flags |= E2F_FLAG_ABORT; 559 return; 560 } 561 } 562 563 should_be = (sb->s_log_block_size == 0 && 564 EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0; 565 if (sb->s_first_data_block != should_be) { 566 pctx.blk = sb->s_first_data_block; 567 pctx.blk2 = should_be; 568 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx); 569 ctx->flags |= E2F_FLAG_ABORT; 570 return; 571 } 572 573 should_be = sb->s_inodes_per_group * fs->group_desc_count; 574 if (sb->s_inodes_count != should_be) { 575 pctx.ino = sb->s_inodes_count; 576 pctx.ino2 = should_be; 577 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) { 578 sb->s_inodes_count = should_be; 579 ext2fs_mark_super_dirty(fs); 580 } 581 } 582 583 /* Is 64bit set and extents unset? */ 584 if (EXT2_HAS_INCOMPAT_FEATURE(fs->super, 585 EXT4_FEATURE_INCOMPAT_64BIT) && 586 !EXT2_HAS_INCOMPAT_FEATURE(fs->super, 587 EXT3_FEATURE_INCOMPAT_EXTENTS) && 588 fix_problem(ctx, PR_0_64BIT_WITHOUT_EXTENTS, &pctx)) { 589 fs->super->s_feature_incompat |= 590 EXT3_FEATURE_INCOMPAT_EXTENTS; 591 ext2fs_mark_super_dirty(fs); 592 } 593 594 /* 595 * Verify the group descriptors.... 596 */ 597 first_block = sb->s_first_data_block; 598 last_block = ext2fs_blocks_count(sb)-1; 599 600 csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 601 EXT4_FEATURE_RO_COMPAT_GDT_CSUM); 602 for (i = 0; i < fs->group_desc_count; i++) { 603 pctx.group = i; 604 605 if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super, 606 EXT4_FEATURE_INCOMPAT_FLEX_BG)) { 607 first_block = ext2fs_group_first_block2(fs, i); 608 last_block = ext2fs_group_last_block2(fs, i); 609 } 610 611 if ((ext2fs_block_bitmap_loc(fs, i) < first_block) || 612 (ext2fs_block_bitmap_loc(fs, i) > last_block)) { 613 pctx.blk = ext2fs_block_bitmap_loc(fs, i); 614 if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx)) 615 ext2fs_block_bitmap_loc_set(fs, i, 0); 616 } 617 if (ext2fs_block_bitmap_loc(fs, i) == 0) { 618 ctx->invalid_block_bitmap_flag[i]++; 619 ctx->invalid_bitmaps++; 620 } 621 if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) || 622 (ext2fs_inode_bitmap_loc(fs, i) > last_block)) { 623 pctx.blk = ext2fs_inode_bitmap_loc(fs, i); 624 if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx)) 625 ext2fs_inode_bitmap_loc_set(fs, i, 0); 626 } 627 if (ext2fs_inode_bitmap_loc(fs, i) == 0) { 628 ctx->invalid_inode_bitmap_flag[i]++; 629 ctx->invalid_bitmaps++; 630 } 631 if ((ext2fs_inode_table_loc(fs, i) < first_block) || 632 ((ext2fs_inode_table_loc(fs, i) + 633 fs->inode_blocks_per_group - 1) > last_block)) { 634 pctx.blk = ext2fs_inode_table_loc(fs, i); 635 if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx)) 636 ext2fs_inode_table_loc_set(fs, i, 0); 637 } 638 if (ext2fs_inode_table_loc(fs, i) == 0) { 639 ctx->invalid_inode_table_flag[i]++; 640 ctx->invalid_bitmaps++; 641 } 642 free_blocks += ext2fs_bg_free_blocks_count(fs, i); 643 free_inodes += ext2fs_bg_free_inodes_count(fs, i); 644 645 if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) || 646 (ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) || 647 (ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group)) 648 ext2fs_unmark_valid(fs); 649 650 should_be = 0; 651 if (!ext2fs_group_desc_csum_verify(fs, i)) { 652 pctx.csum1 = ext2fs_bg_checksum(fs, i); 653 pctx.csum2 = ext2fs_group_desc_csum(fs, i); 654 if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) { 655 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); 656 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT); 657 ext2fs_bg_itable_unused_set(fs, i, 0); 658 should_be = 1; 659 } 660 ext2fs_unmark_valid(fs); 661 } 662 663 if (!csum_flag && 664 (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) || 665 ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) || 666 ext2fs_bg_itable_unused(fs, i) != 0)) { 667 if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) { 668 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); 669 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT); 670 ext2fs_bg_itable_unused_set(fs, i, 0); 671 should_be = 1; 672 } 673 ext2fs_unmark_valid(fs); 674 } 675 676 if (i == fs->group_desc_count - 1 && 677 ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) { 678 if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) { 679 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); 680 should_be = 1; 681 } 682 ext2fs_unmark_valid(fs); 683 } 684 685 if (csum_flag && 686 (ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) || 687 ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) { 688 pctx.blk = ext2fs_bg_itable_unused(fs, i); 689 if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) { 690 ext2fs_bg_itable_unused_set(fs, i, 0); 691 should_be = 1; 692 } 693 ext2fs_unmark_valid(fs); 694 } 695 696 if (should_be) 697 ext2fs_group_desc_csum_set(fs, i); 698 /* If the user aborts e2fsck by typing ^C, stop right away */ 699 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 700 return; 701 } 702 703 ctx->free_blocks = EXT2FS_C2B(fs, free_blocks); 704 ctx->free_inodes = free_inodes; 705 706 if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) || 707 (sb->s_free_inodes_count > sb->s_inodes_count)) 708 ext2fs_unmark_valid(fs); 709 710 711 /* 712 * If we have invalid bitmaps, set the error state of the 713 * filesystem. 714 */ 715 if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) { 716 sb->s_state &= ~EXT2_VALID_FS; 717 ext2fs_mark_super_dirty(fs); 718 } 719 720 clear_problem_context(&pctx); 721 722#ifndef EXT2_SKIP_UUID 723 /* 724 * If the UUID field isn't assigned, assign it. 725 */ 726 if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) { 727 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) { 728 uuid_generate(sb->s_uuid); 729 fs->flags |= EXT2_FLAG_DIRTY; 730 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 731 } 732 } 733#endif 734 735 /* 736 * Check to see if we should disable the test_fs flag 737 */ 738 profile_get_boolean(ctx->profile, "options", 739 "clear_test_fs_flag", 0, 1, 740 &clear_test_fs_flag); 741 if (!(ctx->options & E2F_OPT_READONLY) && 742 clear_test_fs_flag && 743 (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) && 744 (fs_proc_check("ext4") || check_for_modules("ext4"))) { 745 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) { 746 fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS; 747 fs->flags |= EXT2_FLAG_DIRTY; 748 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 749 } 750 } 751 752 /* 753 * For the Hurd, check to see if the filetype option is set, 754 * since it doesn't support it. 755 */ 756 if (!(ctx->options & E2F_OPT_READONLY) && 757 fs->super->s_creator_os == EXT2_OS_HURD && 758 (fs->super->s_feature_incompat & 759 EXT2_FEATURE_INCOMPAT_FILETYPE)) { 760 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) { 761 fs->super->s_feature_incompat &= 762 ~EXT2_FEATURE_INCOMPAT_FILETYPE; 763 ext2fs_mark_super_dirty(fs); 764 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 765 } 766 } 767 768 /* 769 * If we have any of the compatibility flags set, we need to have a 770 * revision 1 filesystem. Most kernels will not check the flags on 771 * a rev 0 filesystem and we may have corruption issues because of 772 * the incompatible changes to the filesystem. 773 */ 774 if (!(ctx->options & E2F_OPT_READONLY) && 775 fs->super->s_rev_level == EXT2_GOOD_OLD_REV && 776 (fs->super->s_feature_compat || 777 fs->super->s_feature_ro_compat || 778 fs->super->s_feature_incompat) && 779 fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) { 780 ext2fs_update_dynamic_rev(fs); 781 ext2fs_mark_super_dirty(fs); 782 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 783 } 784 785 /* 786 * Clean up any orphan inodes, if present. 787 */ 788 if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) { 789 fs->super->s_state &= ~EXT2_VALID_FS; 790 ext2fs_mark_super_dirty(fs); 791 } 792 793 /* 794 * Unfortunately, due to Windows' unfortunate design decision 795 * to configure the hardware clock to tick localtime, instead 796 * of the more proper and less error-prone UTC time, many 797 * users end up in the situation where the system clock is 798 * incorrectly set at the time when e2fsck is run. 799 * 800 * Historically this was usually due to some distributions 801 * having buggy init scripts and/or installers that didn't 802 * correctly detect this case and take appropriate 803 * countermeasures. However, it's still possible, despite the 804 * best efforts of init script and installer authors to not be 805 * able to detect this misconfiguration, usually due to a 806 * buggy or misconfigured virtualization manager or the 807 * installer not having access to a network time server during 808 * the installation process. So by default, we allow the 809 * superblock times to be fudged by up to 24 hours. This can 810 * be disabled by setting options.accept_time_fudge to the 811 * boolean value of false in e2fsck.conf. We also support 812 * options.buggy_init_scripts for backwards compatibility. 813 */ 814 profile_get_boolean(ctx->profile, "options", "accept_time_fudge", 815 0, 1, &accept_time_fudge); 816 profile_get_boolean(ctx->profile, "options", "buggy_init_scripts", 817 0, accept_time_fudge, &accept_time_fudge); 818 ctx->time_fudge = accept_time_fudge ? 86400 : 0; 819 820 profile_get_boolean(ctx->profile, "options", "broken_system_clock", 821 0, 0, &broken_system_clock); 822 823 /* 824 * Check to see if the superblock last mount time or last 825 * write time is in the future. 826 */ 827 if (!broken_system_clock && 828 !(ctx->flags & E2F_FLAG_TIME_INSANE) && 829 fs->super->s_mtime > (__u32) ctx->now) { 830 pctx.num = fs->super->s_mtime; 831 problem = PR_0_FUTURE_SB_LAST_MOUNT; 832 if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge) 833 problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED; 834 if (fix_problem(ctx, problem, &pctx)) { 835 fs->super->s_mtime = ctx->now; 836 fs->flags |= EXT2_FLAG_DIRTY; 837 } 838 } 839 if (!broken_system_clock && 840 !(ctx->flags & E2F_FLAG_TIME_INSANE) && 841 fs->super->s_wtime > (__u32) ctx->now) { 842 pctx.num = fs->super->s_wtime; 843 problem = PR_0_FUTURE_SB_LAST_WRITE; 844 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge) 845 problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED; 846 if (fix_problem(ctx, problem, &pctx)) { 847 fs->super->s_wtime = ctx->now; 848 fs->flags |= EXT2_FLAG_DIRTY; 849 } 850 } 851 852 /* 853 * Move the ext3 journal file, if necessary. 854 */ 855 e2fsck_move_ext3_journal(ctx); 856 857 /* 858 * Fix journal hint, if necessary 859 */ 860 e2fsck_fix_ext3_journal_hint(ctx); 861 862 /* 863 * Add dirhash hint if necessary 864 */ 865 e2fsck_fix_dirhash_hint(ctx); 866 867 /* 868 * Hide quota inodes if necessary. 869 */ 870 e2fsck_hide_quota(ctx); 871 872 return; 873} 874 875/* 876 * Check to see if we should backup the master sb to the backup super 877 * blocks. Returns non-zero if the sb should be backed up. 878 */ 879 880/* 881 * A few flags are set on the fly by the kernel, but only in the 882 * primary superblock. This is actually a bad thing, and we should 883 * try to discourage it in the future. In particular, for the newer 884 * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and 885 * EXT3_FEATURE_INCOMPAT_EXTENTS. So some of these may go away in the 886 * future. EXT3_FEATURE_INCOMPAT_RECOVER may also get set when 887 * copying the primary superblock during online resize. 888 * 889 * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but 890 * unfortunately, we shouldn't ignore it since if it's not set in the 891 * backup, the extended attributes in the filesystem will be stripped 892 * away. 893 */ 894#define FEATURE_RO_COMPAT_IGNORE (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 895 EXT4_FEATURE_RO_COMPAT_DIR_NLINK) 896#define FEATURE_INCOMPAT_IGNORE (EXT3_FEATURE_INCOMPAT_EXTENTS| \ 897 EXT3_FEATURE_INCOMPAT_RECOVER) 898 899int check_backup_super_block(e2fsck_t ctx) 900{ 901 ext2_filsys fs = ctx->fs; 902 errcode_t retval; 903 dgrp_t g; 904 blk64_t sb; 905 int ret = 0; 906 char buf[SUPERBLOCK_SIZE]; 907 struct ext2_super_block *backup_sb; 908 909 /* 910 * If we are already writing out the backup blocks, then we 911 * don't need to test. Also, if the filesystem is invalid, or 912 * the check was aborted or cancelled, we also don't want to 913 * do the backup. If the filesystem was opened read-only then 914 * we can't do the backup. 915 */ 916 if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) || 917 !ext2fs_test_valid(fs) || 918 (fs->super->s_state & EXT2_ERROR_FS) || 919 (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) || 920 (ctx->options & E2F_OPT_READONLY)) 921 return 0; 922 923 for (g = 1; g < fs->group_desc_count; g++) { 924 if (!ext2fs_bg_has_super(fs, g)) 925 continue; 926 927 sb = ext2fs_group_first_block2(fs, g); 928 929 retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE, 930 buf); 931 if (retval) 932 continue; 933 backup_sb = (struct ext2_super_block *) buf; 934#ifdef WORDS_BIGENDIAN 935 ext2fs_swap_super(backup_sb); 936#endif 937 if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) || 938 (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) || 939 ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) > 940 EXT2_MAX_BLOCK_LOG_SIZE) || 941 (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE)) 942 continue; 943 944#define SUPER_INCOMPAT_DIFFERENT(x) \ 945 ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) != \ 946 (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE)) 947#define SUPER_RO_COMPAT_DIFFERENT(x) \ 948 ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) != \ 949 (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE)) 950#define SUPER_DIFFERENT(x) \ 951 (fs->super->x != backup_sb->x) 952 953 if (SUPER_DIFFERENT(s_feature_compat) || 954 SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) || 955 SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) || 956 SUPER_DIFFERENT(s_blocks_count) || 957 SUPER_DIFFERENT(s_blocks_count_hi) || 958 SUPER_DIFFERENT(s_inodes_count) || 959 memcmp(fs->super->s_uuid, backup_sb->s_uuid, 960 sizeof(fs->super->s_uuid))) 961 ret = 1; 962 break; 963 } 964 return ret; 965} 966