super.c revision 624e4a6466dba9889f5f80dc168f2bb7c2a3f5d0
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 25static 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 */ 44struct 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 56static int release_inode_block(ext2_filsys fs, 57 blk64_t *block_nr, 58 e2_blkcnt_t blockcnt, 59 blk64_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 blk64_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 >= ext2fs_blocks_count(fs->super))) { 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_bitmap2(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_blk64(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_blk64(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_blk64(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_stats2(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 */ 153static 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 ((EXT2_I_SIZE(inode) + fs->blocksize - 1) / 174 fs->blocksize); 175 pb.truncate_offset = inode->i_size % fs->blocksize; 176 } else { 177 pb.truncating = 0; 178 pb.truncate_block = 0; 179 pb.truncate_offset = 0; 180 } 181 pb.truncated_blocks = 0; 182 retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE, 183 block_buf, release_inode_block, &pb); 184 if (retval) { 185 com_err("release_inode_blocks", retval, 186 _("while calling ext2fs_block_iterate for inode %d"), 187 ino); 188 return 1; 189 } 190 if (pb.abort) 191 return 1; 192 193 /* Refresh the inode since ext2fs_block_iterate may have changed it */ 194 e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks"); 195 196 if (pb.truncated_blocks) 197 ext2fs_iblk_sub_blocks(fs, inode, pb.truncated_blocks); 198 199 if (ext2fs_file_acl_block(inode)) { 200 retval = ext2fs_adjust_ea_refcount2(fs, ext2fs_file_acl_block(inode), 201 block_buf, -1, &count); 202 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) { 203 retval = 0; 204 count = 1; 205 } 206 if (retval) { 207 com_err("release_inode_blocks", retval, 208 _("while calling ext2fs_adjust_ea_refcount2 for inode %d"), 209 ino); 210 return 1; 211 } 212 if (count == 0) 213 ext2fs_block_alloc_stats2(fs, 214 ext2fs_file_acl_block(inode), 215 -1); 216 ext2fs_file_acl_block_set(inode, 0); 217 } 218 return 0; 219} 220 221/* 222 * This function releases all of the orphan inodes. It returns 1 if 223 * it hit some error, and 0 on success. 224 */ 225static int release_orphan_inodes(e2fsck_t ctx) 226{ 227 ext2_filsys fs = ctx->fs; 228 ext2_ino_t ino, next_ino; 229 struct ext2_inode inode; 230 struct problem_context pctx; 231 char *block_buf; 232 233 if ((ino = fs->super->s_last_orphan) == 0) 234 return 0; 235 236 /* 237 * Win or lose, we won't be using the head of the orphan inode 238 * list again. 239 */ 240 fs->super->s_last_orphan = 0; 241 ext2fs_mark_super_dirty(fs); 242 243 /* 244 * If the filesystem contains errors, don't run the orphan 245 * list, since the orphan list can't be trusted; and we're 246 * going to be running a full e2fsck run anyway... 247 */ 248 if (fs->super->s_state & EXT2_ERROR_FS) 249 return 0; 250 251 if ((ino < EXT2_FIRST_INODE(fs->super)) || 252 (ino > fs->super->s_inodes_count)) { 253 clear_problem_context(&pctx); 254 pctx.ino = ino; 255 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx); 256 return 1; 257 } 258 259 block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4, 260 "block iterate buffer"); 261 e2fsck_read_bitmaps(ctx); 262 263 while (ino) { 264 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes"); 265 clear_problem_context(&pctx); 266 pctx.ino = ino; 267 pctx.inode = &inode; 268 pctx.str = inode.i_links_count ? _("Truncating") : 269 _("Clearing"); 270 271 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx); 272 273 next_ino = inode.i_dtime; 274 if (next_ino && 275 ((next_ino < EXT2_FIRST_INODE(fs->super)) || 276 (next_ino > fs->super->s_inodes_count))) { 277 pctx.ino = next_ino; 278 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx); 279 goto return_abort; 280 } 281 282 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx)) 283 goto return_abort; 284 285 if (!inode.i_links_count) { 286 ext2fs_inode_alloc_stats2(fs, ino, -1, 287 LINUX_S_ISDIR(inode.i_mode)); 288 inode.i_dtime = ctx->now; 289 } else { 290 inode.i_dtime = 0; 291 } 292 e2fsck_write_inode(ctx, ino, &inode, "delete_file"); 293 ino = next_ino; 294 } 295 ext2fs_free_mem(&block_buf); 296 return 0; 297return_abort: 298 ext2fs_free_mem(&block_buf); 299 return 1; 300} 301 302/* 303 * Check the resize inode to make sure it is sane. We check both for 304 * the case where on-line resizing is not enabled (in which case the 305 * resize inode should be cleared) as well as the case where on-line 306 * resizing is enabled. 307 */ 308void check_resize_inode(e2fsck_t ctx) 309{ 310 ext2_filsys fs = ctx->fs; 311 struct ext2_inode inode; 312 struct problem_context pctx; 313 int i, gdt_off, ind_off; 314 dgrp_t j; 315 blk64_t blk, pblk, expect; 316 __u32 *dind_buf = 0, *ind_buf; 317 errcode_t retval; 318 319 clear_problem_context(&pctx); 320 321 /* 322 * If the resize inode feature isn't set, then 323 * s_reserved_gdt_blocks must be zero. 324 */ 325 if (!(fs->super->s_feature_compat & 326 EXT2_FEATURE_COMPAT_RESIZE_INODE)) { 327 if (fs->super->s_reserved_gdt_blocks) { 328 pctx.num = fs->super->s_reserved_gdt_blocks; 329 if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS, 330 &pctx)) { 331 fs->super->s_reserved_gdt_blocks = 0; 332 ext2fs_mark_super_dirty(fs); 333 } 334 } 335 } 336 337 /* Read the resize inode */ 338 pctx.ino = EXT2_RESIZE_INO; 339 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode); 340 if (retval) { 341 if (fs->super->s_feature_compat & 342 EXT2_FEATURE_COMPAT_RESIZE_INODE) 343 ctx->flags |= E2F_FLAG_RESIZE_INODE; 344 return; 345 } 346 347 /* 348 * If the resize inode feature isn't set, check to make sure 349 * the resize inode is cleared; then we're done. 350 */ 351 if (!(fs->super->s_feature_compat & 352 EXT2_FEATURE_COMPAT_RESIZE_INODE)) { 353 for (i=0; i < EXT2_N_BLOCKS; i++) { 354 if (inode.i_block[i]) 355 break; 356 } 357 if ((i < EXT2_N_BLOCKS) && 358 fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) { 359 memset(&inode, 0, sizeof(inode)); 360 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, 361 "clear_resize"); 362 } 363 return; 364 } 365 366 /* 367 * The resize inode feature is enabled; check to make sure the 368 * only block in use is the double indirect block 369 */ 370 blk = inode.i_block[EXT2_DIND_BLOCK]; 371 for (i=0; i < EXT2_N_BLOCKS; i++) { 372 if (i != EXT2_DIND_BLOCK && inode.i_block[i]) 373 break; 374 } 375 if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count || 376 !(inode.i_mode & LINUX_S_IFREG) || 377 (blk < fs->super->s_first_data_block || 378 blk >= ext2fs_blocks_count(fs->super))) { 379 resize_inode_invalid: 380 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) { 381 memset(&inode, 0, sizeof(inode)); 382 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, 383 "clear_resize"); 384 ctx->flags |= E2F_FLAG_RESIZE_INODE; 385 } 386 if (!(ctx->options & E2F_OPT_READONLY)) { 387 fs->super->s_state &= ~EXT2_VALID_FS; 388 ext2fs_mark_super_dirty(fs); 389 } 390 goto cleanup; 391 } 392 dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2, 393 "resize dind buffer"); 394 ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize); 395 396 retval = ext2fs_read_ind_block(fs, blk, dind_buf); 397 if (retval) 398 goto resize_inode_invalid; 399 400 gdt_off = fs->desc_blocks; 401 pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks; 402 if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0) 403 pblk++; /* Deal with 1024 blocksize bigalloc fs */ 404 for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4; 405 i++, gdt_off++, pblk++) { 406 gdt_off %= fs->blocksize/4; 407 if (dind_buf[gdt_off] != pblk) 408 goto resize_inode_invalid; 409 retval = ext2fs_read_ind_block(fs, pblk, ind_buf); 410 if (retval) 411 goto resize_inode_invalid; 412 ind_off = 0; 413 for (j = 1; j < fs->group_desc_count; j++) { 414 if (!ext2fs_bg_has_super(fs, j)) 415 continue; 416 expect = pblk + (j * fs->super->s_blocks_per_group); 417 if (ind_buf[ind_off] != expect) 418 goto resize_inode_invalid; 419 ind_off++; 420 } 421 } 422 423cleanup: 424 if (dind_buf) 425 ext2fs_free_mem(&dind_buf); 426 427 } 428 429/* 430 * This function checks the dirhash signed/unsigned hint if necessary. 431 */ 432static void e2fsck_fix_dirhash_hint(e2fsck_t ctx) 433{ 434 struct ext2_super_block *sb = ctx->fs->super; 435 struct problem_context pctx; 436 char c; 437 438 if ((ctx->options & E2F_OPT_READONLY) || 439 !(sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) || 440 (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH))) 441 return; 442 443 c = (char) 255; 444 445 clear_problem_context(&pctx); 446 if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) { 447 if (((int) c) == -1) { 448 sb->s_flags |= EXT2_FLAGS_SIGNED_HASH; 449 } else { 450 sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH; 451 } 452 ext2fs_mark_super_dirty(ctx->fs); 453 } 454} 455 456 457void check_super_block(e2fsck_t ctx) 458{ 459 ext2_filsys fs = ctx->fs; 460 blk64_t first_block, last_block; 461 struct ext2_super_block *sb = fs->super; 462 problem_t problem; 463 blk64_t blocks_per_group = fs->super->s_blocks_per_group; 464 __u32 bpg_max, cpg_max; 465 int inodes_per_block; 466 int ipg_max; 467 int inode_size; 468 int accept_time_fudge; 469 int broken_system_clock; 470 dgrp_t i; 471 blk64_t should_be; 472 struct problem_context pctx; 473 blk64_t free_blocks = 0; 474 ino_t free_inodes = 0; 475 int csum_flag, clear_test_fs_flag; 476 477 inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super); 478 ipg_max = inodes_per_block * (blocks_per_group - 4); 479 if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb)) 480 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb); 481 cpg_max = 8 * EXT2_BLOCK_SIZE(sb); 482 if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb)) 483 cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb); 484 bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs); 485 if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb)) 486 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb); 487 488 ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx, 489 sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap"); 490 ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx, 491 sizeof(int) * fs->group_desc_count, "invalid_block_bitmap"); 492 ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx, 493 sizeof(int) * fs->group_desc_count, "invalid_inode_table"); 494 495 clear_problem_context(&pctx); 496 497 /* 498 * Verify the super block constants... 499 */ 500 check_super_value(ctx, "inodes_count", sb->s_inodes_count, 501 MIN_CHECK, 1, 0); 502 check_super_value(ctx, "blocks_count", ext2fs_blocks_count(sb), 503 MIN_CHECK, 1, 0); 504 check_super_value(ctx, "first_data_block", sb->s_first_data_block, 505 MAX_CHECK, 0, ext2fs_blocks_count(sb)); 506 check_super_value(ctx, "log_block_size", sb->s_log_block_size, 507 MIN_CHECK | MAX_CHECK, 0, 508 EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE); 509 check_super_value(ctx, "log_cluster_size", 510 sb->s_log_cluster_size, 511 MIN_CHECK | MAX_CHECK, sb->s_log_block_size, 512 (EXT2_MAX_CLUSTER_LOG_SIZE - 513 EXT2_MIN_CLUSTER_LOG_SIZE)); 514 check_super_value(ctx, "clusters_per_group", sb->s_clusters_per_group, 515 MIN_CHECK | MAX_CHECK, 8, cpg_max); 516 check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group, 517 MIN_CHECK | MAX_CHECK, 8, bpg_max); 518 check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group, 519 MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max); 520 check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb), 521 MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2); 522 check_super_value(ctx, "reserved_gdt_blocks", 523 sb->s_reserved_gdt_blocks, MAX_CHECK, 0, 524 fs->blocksize/4); 525 if (sb->s_rev_level > EXT2_GOOD_OLD_REV) 526 check_super_value(ctx, "first_ino", sb->s_first_ino, 527 MIN_CHECK | MAX_CHECK, 528 EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count); 529 inode_size = EXT2_INODE_SIZE(sb); 530 check_super_value(ctx, "inode_size", 531 inode_size, MIN_CHECK | MAX_CHECK, 532 EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize); 533 if (sb->s_blocks_per_group != (sb->s_clusters_per_group * 534 EXT2FS_CLUSTER_RATIO(fs))) { 535 pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs); 536 pctx.str = "block_size"; 537 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); 538 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */ 539 return; 540 } 541 if (inode_size & (inode_size - 1)) { 542 pctx.num = inode_size; 543 pctx.str = "inode_size"; 544 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); 545 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */ 546 return; 547 } 548 549 if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) && 550 (ctx->num_blocks < ext2fs_blocks_count(sb))) { 551 pctx.blk = ext2fs_blocks_count(sb); 552 pctx.blk2 = ctx->num_blocks; 553 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) { 554 ctx->flags |= E2F_FLAG_ABORT; 555 return; 556 } 557 } 558 559 should_be = (sb->s_log_block_size == 0 && 560 EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0; 561 if (sb->s_first_data_block != should_be) { 562 pctx.blk = sb->s_first_data_block; 563 pctx.blk2 = should_be; 564 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx); 565 ctx->flags |= E2F_FLAG_ABORT; 566 return; 567 } 568 569 should_be = sb->s_inodes_per_group * fs->group_desc_count; 570 if (sb->s_inodes_count != should_be) { 571 pctx.ino = sb->s_inodes_count; 572 pctx.ino2 = should_be; 573 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) { 574 sb->s_inodes_count = should_be; 575 ext2fs_mark_super_dirty(fs); 576 } 577 } 578 579 /* 580 * Verify the group descriptors.... 581 */ 582 first_block = sb->s_first_data_block; 583 last_block = ext2fs_blocks_count(sb)-1; 584 585 csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 586 EXT4_FEATURE_RO_COMPAT_GDT_CSUM); 587 for (i = 0; i < fs->group_desc_count; i++) { 588 pctx.group = i; 589 590 if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super, 591 EXT4_FEATURE_INCOMPAT_FLEX_BG)) { 592 first_block = ext2fs_group_first_block2(fs, i); 593 last_block = ext2fs_group_last_block2(fs, i); 594 } 595 596 if ((ext2fs_block_bitmap_loc(fs, i) < first_block) || 597 (ext2fs_block_bitmap_loc(fs, i) > last_block)) { 598 pctx.blk = ext2fs_block_bitmap_loc(fs, i); 599 if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx)) 600 ext2fs_block_bitmap_loc_set(fs, i, 0); 601 } 602 if (ext2fs_block_bitmap_loc(fs, i) == 0) { 603 ctx->invalid_block_bitmap_flag[i]++; 604 ctx->invalid_bitmaps++; 605 } 606 if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) || 607 (ext2fs_inode_bitmap_loc(fs, i) > last_block)) { 608 pctx.blk = ext2fs_inode_bitmap_loc(fs, i); 609 if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx)) 610 ext2fs_inode_bitmap_loc_set(fs, i, 0); 611 } 612 if (ext2fs_inode_bitmap_loc(fs, i) == 0) { 613 ctx->invalid_inode_bitmap_flag[i]++; 614 ctx->invalid_bitmaps++; 615 } 616 if ((ext2fs_inode_table_loc(fs, i) < first_block) || 617 ((ext2fs_inode_table_loc(fs, i) + 618 fs->inode_blocks_per_group - 1) > last_block)) { 619 pctx.blk = ext2fs_inode_table_loc(fs, i); 620 if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx)) 621 ext2fs_inode_table_loc_set(fs, i, 0); 622 } 623 if (ext2fs_inode_table_loc(fs, i) == 0) { 624 ctx->invalid_inode_table_flag[i]++; 625 ctx->invalid_bitmaps++; 626 } 627 free_blocks += ext2fs_bg_free_blocks_count(fs, i); 628 free_inodes += ext2fs_bg_free_inodes_count(fs, i); 629 630 if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) || 631 (ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) || 632 (ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group)) 633 ext2fs_unmark_valid(fs); 634 635 should_be = 0; 636 if (!ext2fs_group_desc_csum_verify(fs, i)) { 637 if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) { 638 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); 639 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT); 640 ext2fs_bg_itable_unused_set(fs, i, 0); 641 should_be = 1; 642 } 643 ext2fs_unmark_valid(fs); 644 } 645 646 if (!csum_flag && 647 (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) || 648 ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) || 649 ext2fs_bg_itable_unused(fs, i) != 0)) { 650 if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) { 651 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); 652 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT); 653 ext2fs_bg_itable_unused_set(fs, i, 0); 654 should_be = 1; 655 } 656 ext2fs_unmark_valid(fs); 657 } 658 659 if (i == fs->group_desc_count - 1 && 660 ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) { 661 if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) { 662 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); 663 should_be = 1; 664 } 665 ext2fs_unmark_valid(fs); 666 } 667 668 if (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) && 669 !ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT)) { 670 if (fix_problem(ctx, PR_0_BB_UNINIT_IB_INIT, &pctx)) { 671 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); 672 should_be = 1; 673 } 674 ext2fs_unmark_valid(fs); 675 } 676 677 if (csum_flag && 678 (ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) || 679 ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) { 680 pctx.blk = ext2fs_bg_itable_unused(fs, i); 681 if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) { 682 ext2fs_bg_itable_unused_set(fs, i, 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 /* If the user aborts e2fsck by typing ^C, stop right away */ 691 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 692 return; 693 } 694 695 ctx->free_blocks = EXT2FS_C2B(fs, free_blocks); 696 ctx->free_inodes = free_inodes; 697 698 if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) || 699 (sb->s_free_inodes_count > sb->s_inodes_count)) 700 ext2fs_unmark_valid(fs); 701 702 703 /* 704 * If we have invalid bitmaps, set the error state of the 705 * filesystem. 706 */ 707 if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) { 708 sb->s_state &= ~EXT2_VALID_FS; 709 ext2fs_mark_super_dirty(fs); 710 } 711 712 clear_problem_context(&pctx); 713 714#ifndef EXT2_SKIP_UUID 715 /* 716 * If the UUID field isn't assigned, assign it. 717 */ 718 if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) { 719 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) { 720 uuid_generate(sb->s_uuid); 721 ext2fs_mark_super_dirty(fs); 722 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 723 } 724 } 725#endif 726 727 /* 728 * Check to see if we should disable the test_fs flag 729 */ 730 profile_get_boolean(ctx->profile, "options", 731 "clear_test_fs_flag", 0, 1, 732 &clear_test_fs_flag); 733 if (!(ctx->options & E2F_OPT_READONLY) && 734 clear_test_fs_flag && 735 (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) && 736 (fs_proc_check("ext4") || check_for_modules("ext4"))) { 737 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) { 738 fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS; 739 ext2fs_mark_super_dirty(fs); 740 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 741 } 742 } 743 744 /* 745 * For the Hurd, check to see if the filetype option is set, 746 * since it doesn't support it. 747 */ 748 if (!(ctx->options & E2F_OPT_READONLY) && 749 fs->super->s_creator_os == EXT2_OS_HURD && 750 (fs->super->s_feature_incompat & 751 EXT2_FEATURE_INCOMPAT_FILETYPE)) { 752 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) { 753 fs->super->s_feature_incompat &= 754 ~EXT2_FEATURE_INCOMPAT_FILETYPE; 755 ext2fs_mark_super_dirty(fs); 756 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 757 } 758 } 759 760 /* 761 * If we have any of the compatibility flags set, we need to have a 762 * revision 1 filesystem. Most kernels will not check the flags on 763 * a rev 0 filesystem and we may have corruption issues because of 764 * the incompatible changes to the filesystem. 765 */ 766 if (!(ctx->options & E2F_OPT_READONLY) && 767 fs->super->s_rev_level == EXT2_GOOD_OLD_REV && 768 (fs->super->s_feature_compat || 769 fs->super->s_feature_ro_compat || 770 fs->super->s_feature_incompat) && 771 fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) { 772 ext2fs_update_dynamic_rev(fs); 773 ext2fs_mark_super_dirty(fs); 774 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 775 } 776 777 /* 778 * Clean up any orphan inodes, if present. 779 */ 780 if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) { 781 fs->super->s_state &= ~EXT2_VALID_FS; 782 ext2fs_mark_super_dirty(fs); 783 } 784 785 /* 786 * Unfortunately, due to Windows' unfortunate design decision 787 * to configure the hardware clock to tick localtime, instead 788 * of the more proper and less error-prone UTC time, many 789 * users end up in the situation where the system clock is 790 * incorrectly set at the time when e2fsck is run. 791 * 792 * Historically this was usually due to some distributions 793 * having buggy init scripts and/or installers that didn't 794 * correctly detect this case and take appropriate 795 * countermeasures. However, it's still possible, despite the 796 * best efforts of init script and installer authors to not be 797 * able to detect this misconfiguration, usually due to a 798 * buggy or misconfigured virtualization manager or the 799 * installer not having access to a network time server during 800 * the installation process. So by default, we allow the 801 * superblock times to be fudged by up to 24 hours. This can 802 * be disabled by setting options.accept_time_fudge to the 803 * boolean value of false in e2fsck.conf. We also support 804 * options.buggy_init_scripts for backwards compatibility. 805 */ 806 profile_get_boolean(ctx->profile, "options", "accept_time_fudge", 807 0, 1, &accept_time_fudge); 808 profile_get_boolean(ctx->profile, "options", "buggy_init_scripts", 809 0, accept_time_fudge, &accept_time_fudge); 810 ctx->time_fudge = accept_time_fudge ? 86400 : 0; 811 812 profile_get_boolean(ctx->profile, "options", "broken_system_clock", 813 0, 0, &broken_system_clock); 814 815 /* 816 * Check to see if the superblock last mount time or last 817 * write time is in the future. 818 */ 819 if (!broken_system_clock && 820 !(ctx->flags & E2F_FLAG_TIME_INSANE) && 821 fs->super->s_mtime > (__u32) ctx->now) { 822 pctx.num = fs->super->s_mtime; 823 problem = PR_0_FUTURE_SB_LAST_MOUNT; 824 if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge) 825 problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED; 826 if (fix_problem(ctx, problem, &pctx)) { 827 fs->super->s_mtime = ctx->now; 828 ext2fs_mark_super_dirty(fs); 829 } 830 } 831 if (!broken_system_clock && 832 !(ctx->flags & E2F_FLAG_TIME_INSANE) && 833 fs->super->s_wtime > (__u32) ctx->now) { 834 pctx.num = fs->super->s_wtime; 835 problem = PR_0_FUTURE_SB_LAST_WRITE; 836 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge) 837 problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED; 838 if (fix_problem(ctx, problem, &pctx)) { 839 fs->super->s_wtime = ctx->now; 840 ext2fs_mark_super_dirty(fs); 841 } 842 } 843 844 /* 845 * Move the ext3 journal file, if necessary. 846 */ 847 e2fsck_move_ext3_journal(ctx); 848 849 /* 850 * Fix journal hint, if necessary 851 */ 852 e2fsck_fix_ext3_journal_hint(ctx); 853 854 /* 855 * Add dirhash hint if necessary 856 */ 857 e2fsck_fix_dirhash_hint(ctx); 858 859 /* 860 * Hide quota inodes if necessary. 861 */ 862 e2fsck_hide_quota(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 891int check_backup_super_block(e2fsck_t ctx) 892{ 893 ext2_filsys fs = ctx->fs; 894 errcode_t retval; 895 dgrp_t g; 896 blk64_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