1 /* 2 * pass5.c --- check block and inode bitmaps against on-disk bitmaps 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 13 #include <stdint.h> 14 #include <sys/types.h> 15 #include <sys/stat.h> 16 #include <sys/ioctl.h> 17 #include <fcntl.h> 18 #include <errno.h> 19 20 #include "e2fsck.h" 21 #include "problem.h" 22 23 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 24 25 static void check_block_bitmaps(e2fsck_t ctx); 26 static void check_inode_bitmaps(e2fsck_t ctx); 27 static void check_inode_end(e2fsck_t ctx); 28 static void check_block_end(e2fsck_t ctx); 29 30 void e2fsck_pass5(e2fsck_t ctx) 31 { 32 #ifdef RESOURCE_TRACK 33 struct resource_track rtrack; 34 #endif 35 struct problem_context pctx; 36 37 #ifdef MTRACE 38 mtrace_print("Pass 5"); 39 #endif 40 41 init_resource_track(&rtrack, ctx->fs->io); 42 clear_problem_context(&pctx); 43 44 if (!(ctx->options & E2F_OPT_PREEN)) 45 fix_problem(ctx, PR_5_PASS_HEADER, &pctx); 46 47 if (ctx->progress) 48 if ((ctx->progress)(ctx, 5, 0, ctx->fs->group_desc_count*2)) 49 return; 50 51 e2fsck_read_bitmaps(ctx); 52 53 check_block_bitmaps(ctx); 54 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 55 return; 56 check_inode_bitmaps(ctx); 57 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 58 return; 59 check_inode_end(ctx); 60 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 61 return; 62 check_block_end(ctx); 63 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 64 return; 65 66 ext2fs_free_inode_bitmap(ctx->inode_used_map); 67 ctx->inode_used_map = 0; 68 ext2fs_free_inode_bitmap(ctx->inode_dir_map); 69 ctx->inode_dir_map = 0; 70 ext2fs_free_block_bitmap(ctx->block_found_map); 71 ctx->block_found_map = 0; 72 73 print_resource_track(ctx, _("Pass 5"), &rtrack, ctx->fs->io); 74 } 75 76 static void e2fsck_discard_blocks(e2fsck_t ctx, blk64_t start, 77 blk64_t count) 78 { 79 ext2_filsys fs = ctx->fs; 80 81 /* 82 * If the filesystem has changed it means that there was an corruption 83 * which should be repaired, but in some cases just one e2fsck run is 84 * not enough to fix the problem, hence it is not safe to run discard 85 * in this case. 86 */ 87 if (ext2fs_test_changed(fs)) 88 ctx->options &= ~E2F_OPT_DISCARD; 89 90 if ((ctx->options & E2F_OPT_DISCARD) && 91 (io_channel_discard(fs->io, start, count))) 92 ctx->options &= ~E2F_OPT_DISCARD; 93 } 94 95 /* 96 * This will try to discard number 'count' inodes starting at 97 * inode number 'start' within the 'group'. Note that 'start' 98 * is 1-based, it means that we need to adjust it by -1 in this 99 * function to compute right offset in the particular inode table. 100 */ 101 static void e2fsck_discard_inodes(e2fsck_t ctx, dgrp_t group, 102 ext2_ino_t start, int count) 103 { 104 ext2_filsys fs = ctx->fs; 105 blk64_t blk, num; 106 107 /* 108 * Sanity check for 'start' 109 */ 110 if ((start < 1) || (start > EXT2_INODES_PER_GROUP(fs->super))) { 111 printf("PROGRAMMING ERROR: Got start %d outside of group %d!" 112 " Disabling discard\n", 113 start, group); 114 ctx->options &= ~E2F_OPT_DISCARD; 115 } 116 117 /* 118 * Do not attempt to discard if E2F_OPT_DISCARD is not set. And also 119 * skip the discard on this group if discard does not zero data. 120 * The reason is that if the inode table is not zeroed discard would 121 * no help us since we need to zero it anyway, or if the inode table 122 * is zeroed then the read after discard would not be deterministic 123 * anyway and we would not be able to assume that this inode table 124 * was zeroed anymore so we would have to zero it again, which does 125 * not really make sense. 126 */ 127 if (!(ctx->options & E2F_OPT_DISCARD) || 128 !io_channel_discard_zeroes_data(fs->io)) 129 return; 130 131 /* 132 * Start is inode number within the group which starts 133 * counting from 1, so we need to adjust it. 134 */ 135 start -= 1; 136 137 /* 138 * We can discard only blocks containing only unused 139 * inodes in the table. 140 */ 141 blk = DIV_ROUND_UP(start, 142 EXT2_INODES_PER_BLOCK(fs->super)); 143 count -= (blk * EXT2_INODES_PER_BLOCK(fs->super) - start); 144 blk += ext2fs_inode_table_loc(fs, group); 145 num = count / EXT2_INODES_PER_BLOCK(fs->super); 146 147 if (num > 0) 148 e2fsck_discard_blocks(ctx, blk, num); 149 } 150 151 #define NO_BLK ((blk64_t) -1) 152 153 static void print_bitmap_problem(e2fsck_t ctx, problem_t problem, 154 struct problem_context *pctx) 155 { 156 switch (problem) { 157 case PR_5_BLOCK_UNUSED: 158 if (pctx->blk == pctx->blk2) 159 pctx->blk2 = 0; 160 else 161 problem = PR_5_BLOCK_RANGE_UNUSED; 162 break; 163 case PR_5_BLOCK_USED: 164 if (pctx->blk == pctx->blk2) 165 pctx->blk2 = 0; 166 else 167 problem = PR_5_BLOCK_RANGE_USED; 168 break; 169 case PR_5_INODE_UNUSED: 170 if (pctx->ino == pctx->ino2) 171 pctx->ino2 = 0; 172 else 173 problem = PR_5_INODE_RANGE_UNUSED; 174 break; 175 case PR_5_INODE_USED: 176 if (pctx->ino == pctx->ino2) 177 pctx->ino2 = 0; 178 else 179 problem = PR_5_INODE_RANGE_USED; 180 break; 181 } 182 fix_problem(ctx, problem, pctx); 183 pctx->blk = pctx->blk2 = NO_BLK; 184 pctx->ino = pctx->ino2 = 0; 185 } 186 187 /* Just to be more succint */ 188 #define B2C(x) EXT2FS_B2C(fs, (x)) 189 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y)) 190 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y)) 191 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y)) 192 193 static void check_block_bitmaps(e2fsck_t ctx) 194 { 195 ext2_filsys fs = ctx->fs; 196 blk64_t i; 197 unsigned int *free_array; 198 dgrp_t g, group = 0; 199 unsigned int blocks = 0; 200 blk64_t free_blocks = 0; 201 blk64_t first_free = ext2fs_blocks_count(fs->super); 202 unsigned int group_free = 0; 203 int actual, bitmap; 204 struct problem_context pctx; 205 problem_t problem, save_problem; 206 int fixit, had_problem; 207 errcode_t retval; 208 int csum_flag; 209 int skip_group = 0; 210 int old_desc_blocks = 0; 211 int count = 0; 212 int cmp_block = 0; 213 int redo_flag = 0; 214 blk64_t super_blk, old_desc_blk, new_desc_blk; 215 char *actual_buf, *bitmap_buf; 216 217 actual_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize, 218 "actual bitmap buffer"); 219 bitmap_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize, 220 "bitmap block buffer"); 221 222 clear_problem_context(&pctx); 223 free_array = (unsigned int *) e2fsck_allocate_memory(ctx, 224 fs->group_desc_count * sizeof(unsigned int), "free block count array"); 225 226 if ((B2C(fs->super->s_first_data_block) < 227 ext2fs_get_block_bitmap_start2(ctx->block_found_map)) || 228 (B2C(ext2fs_blocks_count(fs->super)-1) > 229 ext2fs_get_block_bitmap_end2(ctx->block_found_map))) { 230 pctx.num = 1; 231 pctx.blk = B2C(fs->super->s_first_data_block); 232 pctx.blk2 = B2C(ext2fs_blocks_count(fs->super) - 1); 233 pctx.ino = ext2fs_get_block_bitmap_start2(ctx->block_found_map); 234 pctx.ino2 = ext2fs_get_block_bitmap_end2(ctx->block_found_map); 235 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx); 236 237 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 238 goto errout; 239 } 240 241 if ((B2C(fs->super->s_first_data_block) < 242 ext2fs_get_block_bitmap_start2(fs->block_map)) || 243 (B2C(ext2fs_blocks_count(fs->super)-1) > 244 ext2fs_get_block_bitmap_end2(fs->block_map))) { 245 pctx.num = 2; 246 pctx.blk = B2C(fs->super->s_first_data_block); 247 pctx.blk2 = B2C(ext2fs_blocks_count(fs->super) - 1); 248 pctx.ino = ext2fs_get_block_bitmap_start2(fs->block_map); 249 pctx.ino2 = ext2fs_get_block_bitmap_end2(fs->block_map); 250 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx); 251 252 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 253 goto errout; 254 } 255 256 csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 257 EXT4_FEATURE_RO_COMPAT_GDT_CSUM); 258 redo_counts: 259 had_problem = 0; 260 save_problem = 0; 261 pctx.blk = pctx.blk2 = NO_BLK; 262 if (csum_flag && 263 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) 264 skip_group++; 265 for (i = B2C(fs->super->s_first_data_block); 266 i < ext2fs_blocks_count(fs->super); 267 i += EXT2FS_CLUSTER_RATIO(fs)) { 268 int first_block_in_bg = (B2C(i) - 269 B2C(fs->super->s_first_data_block)) % 270 fs->super->s_clusters_per_group == 0; 271 int n, nbytes = fs->super->s_clusters_per_group / 8; 272 273 actual = ext2fs_fast_test_block_bitmap2(ctx->block_found_map, i); 274 275 /* 276 * Try to optimize pass5 by extracting a bitmap block 277 * as expected from what we have on disk, and then 278 * comparing the two. If they are identical, then 279 * update the free block counts and go on to the next 280 * block group. This is much faster than doing the 281 * individual bit-by-bit comparison. The one downside 282 * is that this doesn't work if we are asking e2fsck 283 * to do a discard operation. 284 */ 285 if (!first_block_in_bg || 286 (group == (int)fs->group_desc_count - 1) || 287 (ctx->options & E2F_OPT_DISCARD)) 288 goto no_optimize; 289 290 retval = ext2fs_get_block_bitmap_range2(ctx->block_found_map, 291 B2C(i), fs->super->s_clusters_per_group, 292 actual_buf); 293 if (retval) 294 goto no_optimize; 295 if (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)) 296 memset(bitmap_buf, 0, nbytes); 297 else { 298 retval = ext2fs_get_block_bitmap_range2(fs->block_map, 299 B2C(i), fs->super->s_clusters_per_group, 300 bitmap_buf); 301 if (retval) 302 goto no_optimize; 303 } 304 if (memcmp(actual_buf, bitmap_buf, nbytes) != 0) 305 goto no_optimize; 306 n = ext2fs_bitcount(actual_buf, nbytes); 307 group_free = fs->super->s_clusters_per_group - n; 308 free_blocks += group_free; 309 i += EXT2FS_C2B(fs, fs->super->s_clusters_per_group - 1); 310 goto next_group; 311 no_optimize: 312 313 if (skip_group) { 314 if (first_block_in_bg) { 315 super_blk = 0; 316 old_desc_blk = 0; 317 new_desc_blk = 0; 318 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, 319 &old_desc_blk, &new_desc_blk, 0); 320 321 if (fs->super->s_feature_incompat & 322 EXT2_FEATURE_INCOMPAT_META_BG) 323 old_desc_blocks = 324 fs->super->s_first_meta_bg; 325 else 326 old_desc_blocks = fs->desc_blocks + 327 fs->super->s_reserved_gdt_blocks; 328 329 count = 0; 330 cmp_block = fs->super->s_clusters_per_group; 331 if (group == (int)fs->group_desc_count - 1) 332 cmp_block = EXT2FS_NUM_B2C(fs, 333 ext2fs_group_blocks_count(fs, group)); 334 } 335 336 bitmap = 0; 337 if (EQ_CLSTR(i, super_blk) || 338 (old_desc_blk && old_desc_blocks && 339 GE_CLSTR(i, old_desc_blk) && 340 LE_CLSTR(i, old_desc_blk + old_desc_blocks-1)) || 341 (new_desc_blk && EQ_CLSTR(i, new_desc_blk)) || 342 EQ_CLSTR(i, ext2fs_block_bitmap_loc(fs, group)) || 343 EQ_CLSTR(i, ext2fs_inode_bitmap_loc(fs, group)) || 344 (GE_CLSTR(i, ext2fs_inode_table_loc(fs, group)) && 345 LE_CLSTR(i, (ext2fs_inode_table_loc(fs, group) + 346 fs->inode_blocks_per_group - 1)))) { 347 bitmap = 1; 348 actual = (actual != 0); 349 count++; 350 cmp_block--; 351 } else if ((EXT2FS_B2C(fs, i) - count - 352 EXT2FS_B2C(fs, fs->super->s_first_data_block)) % 353 fs->super->s_clusters_per_group == 0) { 354 /* 355 * When the compare data blocks in block bitmap 356 * are 0, count the free block, 357 * skip the current block group. 358 */ 359 if (ext2fs_test_block_bitmap_range2( 360 ctx->block_found_map, 361 EXT2FS_B2C(fs, i), 362 cmp_block)) { 363 /* 364 * -1 means to skip the current block 365 * group. 366 */ 367 blocks = fs->super->s_clusters_per_group - 1; 368 group_free = cmp_block; 369 free_blocks += cmp_block; 370 /* 371 * The current block group's last block 372 * is set to i. 373 */ 374 i += EXT2FS_C2B(fs, cmp_block - 1); 375 bitmap = 1; 376 goto do_counts; 377 } 378 } 379 } else if (redo_flag) 380 bitmap = actual; 381 else 382 bitmap = ext2fs_fast_test_block_bitmap2(fs->block_map, i); 383 384 if (!actual == !bitmap) 385 goto do_counts; 386 387 if (!actual && bitmap) { 388 /* 389 * Block not used, but marked in use in the bitmap. 390 */ 391 problem = PR_5_BLOCK_UNUSED; 392 } else { 393 /* 394 * Block used, but not marked in use in the bitmap. 395 */ 396 problem = PR_5_BLOCK_USED; 397 398 if (skip_group) { 399 struct problem_context pctx2; 400 pctx2.blk = i; 401 pctx2.group = group; 402 if (fix_problem(ctx, PR_5_BLOCK_UNINIT,&pctx2)){ 403 ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT); 404 skip_group = 0; 405 } 406 } 407 } 408 if (pctx.blk == NO_BLK) { 409 pctx.blk = pctx.blk2 = i; 410 save_problem = problem; 411 } else { 412 if ((problem == save_problem) && 413 (pctx.blk2 == i - EXT2FS_CLUSTER_RATIO(fs))) 414 pctx.blk2 += EXT2FS_CLUSTER_RATIO(fs); 415 else { 416 print_bitmap_problem(ctx, save_problem, &pctx); 417 pctx.blk = pctx.blk2 = i; 418 save_problem = problem; 419 } 420 } 421 ctx->flags |= E2F_FLAG_PROG_SUPPRESS; 422 had_problem++; 423 424 /* 425 * If there a problem we should turn off the discard so we 426 * do not compromise the filesystem. 427 */ 428 ctx->options &= ~E2F_OPT_DISCARD; 429 430 do_counts: 431 if (!bitmap) { 432 group_free++; 433 free_blocks++; 434 if (first_free > i) 435 first_free = i; 436 } else if (i > first_free) { 437 e2fsck_discard_blocks(ctx, first_free, 438 (i - first_free)); 439 first_free = ext2fs_blocks_count(fs->super); 440 } 441 blocks ++; 442 if ((blocks == fs->super->s_clusters_per_group) || 443 (EXT2FS_B2C(fs, i) == 444 EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1))) { 445 /* 446 * If the last block of this group is free, then we can 447 * discard it as well. 448 */ 449 if (!bitmap && i >= first_free) 450 e2fsck_discard_blocks(ctx, first_free, 451 (i - first_free) + 1); 452 next_group: 453 first_free = ext2fs_blocks_count(fs->super); 454 455 free_array[group] = group_free; 456 group ++; 457 blocks = 0; 458 group_free = 0; 459 skip_group = 0; 460 if (ctx->progress) 461 if ((ctx->progress)(ctx, 5, group, 462 fs->group_desc_count*2)) 463 goto errout; 464 if (csum_flag && 465 (i != ext2fs_blocks_count(fs->super)-1) && 466 ext2fs_bg_flags_test(fs, group, 467 EXT2_BG_BLOCK_UNINIT)) 468 skip_group++; 469 } 470 } 471 if (pctx.blk != NO_BLK) 472 print_bitmap_problem(ctx, save_problem, &pctx); 473 if (had_problem) 474 fixit = end_problem_latch(ctx, PR_LATCH_BBITMAP); 475 else 476 fixit = -1; 477 ctx->flags &= ~E2F_FLAG_PROG_SUPPRESS; 478 479 if (fixit == 1) { 480 ext2fs_free_block_bitmap(fs->block_map); 481 retval = ext2fs_copy_bitmap(ctx->block_found_map, 482 &fs->block_map); 483 if (retval) { 484 clear_problem_context(&pctx); 485 fix_problem(ctx, PR_5_COPY_BBITMAP_ERROR, &pctx); 486 ctx->flags |= E2F_FLAG_ABORT; 487 goto errout; 488 } 489 ext2fs_set_bitmap_padding(fs->block_map); 490 ext2fs_mark_bb_dirty(fs); 491 492 /* Redo the counts */ 493 blocks = 0; free_blocks = 0; group_free = 0; group = 0; 494 memset(free_array, 0, fs->group_desc_count * sizeof(int)); 495 redo_flag++; 496 goto redo_counts; 497 } else if (fixit == 0) 498 ext2fs_unmark_valid(fs); 499 500 for (g = 0; g < fs->group_desc_count; g++) { 501 if (free_array[g] != ext2fs_bg_free_blocks_count(fs, g)) { 502 pctx.group = g; 503 pctx.blk = ext2fs_bg_free_blocks_count(fs, g); 504 pctx.blk2 = free_array[g]; 505 506 if (fix_problem(ctx, PR_5_FREE_BLOCK_COUNT_GROUP, 507 &pctx)) { 508 ext2fs_bg_free_blocks_count_set(fs, g, free_array[g]); 509 ext2fs_mark_super_dirty(fs); 510 } else 511 ext2fs_unmark_valid(fs); 512 } 513 } 514 free_blocks = EXT2FS_C2B(fs, free_blocks); 515 if (free_blocks != ext2fs_free_blocks_count(fs->super)) { 516 pctx.group = 0; 517 pctx.blk = ext2fs_free_blocks_count(fs->super); 518 pctx.blk2 = free_blocks; 519 520 if (fix_problem(ctx, PR_5_FREE_BLOCK_COUNT, &pctx)) { 521 ext2fs_free_blocks_count_set(fs->super, free_blocks); 522 ext2fs_mark_super_dirty(fs); 523 } 524 } 525 errout: 526 ext2fs_free_mem(&free_array); 527 ext2fs_free_mem(&actual_buf); 528 ext2fs_free_mem(&bitmap_buf); 529 } 530 531 static void check_inode_bitmaps(e2fsck_t ctx) 532 { 533 ext2_filsys fs = ctx->fs; 534 ext2_ino_t i; 535 unsigned int free_inodes = 0; 536 int group_free = 0; 537 int dirs_count = 0; 538 dgrp_t group = 0; 539 unsigned int inodes = 0; 540 ext2_ino_t *free_array; 541 ext2_ino_t *dir_array; 542 int actual, bitmap; 543 errcode_t retval; 544 struct problem_context pctx; 545 problem_t problem, save_problem; 546 int fixit, had_problem; 547 int csum_flag; 548 int skip_group = 0; 549 int redo_flag = 0; 550 ext2_ino_t first_free = fs->super->s_inodes_per_group + 1; 551 552 clear_problem_context(&pctx); 553 free_array = (ext2_ino_t *) e2fsck_allocate_memory(ctx, 554 fs->group_desc_count * sizeof(ext2_ino_t), "free inode count array"); 555 556 dir_array = (ext2_ino_t *) e2fsck_allocate_memory(ctx, 557 fs->group_desc_count * sizeof(ext2_ino_t), "directory count array"); 558 559 if ((1 < ext2fs_get_inode_bitmap_start2(ctx->inode_used_map)) || 560 (fs->super->s_inodes_count > 561 ext2fs_get_inode_bitmap_end2(ctx->inode_used_map))) { 562 pctx.num = 3; 563 pctx.blk = 1; 564 pctx.blk2 = fs->super->s_inodes_count; 565 pctx.ino = ext2fs_get_inode_bitmap_start2(ctx->inode_used_map); 566 pctx.ino2 = ext2fs_get_inode_bitmap_end2(ctx->inode_used_map); 567 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx); 568 569 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 570 goto errout; 571 } 572 if ((1 < ext2fs_get_inode_bitmap_start2(fs->inode_map)) || 573 (fs->super->s_inodes_count > 574 ext2fs_get_inode_bitmap_end2(fs->inode_map))) { 575 pctx.num = 4; 576 pctx.blk = 1; 577 pctx.blk2 = fs->super->s_inodes_count; 578 pctx.ino = ext2fs_get_inode_bitmap_start2(fs->inode_map); 579 pctx.ino2 = ext2fs_get_inode_bitmap_end2(fs->inode_map); 580 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx); 581 582 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 583 goto errout; 584 } 585 586 csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 587 EXT4_FEATURE_RO_COMPAT_GDT_CSUM); 588 redo_counts: 589 had_problem = 0; 590 save_problem = 0; 591 pctx.ino = pctx.ino2 = 0; 592 if (csum_flag && 593 (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT))) 594 skip_group++; 595 596 /* Protect loop from wrap-around if inodes_count is maxed */ 597 for (i = 1; i <= fs->super->s_inodes_count && i > 0; i++) { 598 bitmap = 0; 599 if (skip_group && 600 i % fs->super->s_inodes_per_group == 1) { 601 /* 602 * Current inode is the first inode 603 * in the current block group. 604 */ 605 if (ext2fs_test_inode_bitmap_range( 606 ctx->inode_used_map, i, 607 fs->super->s_inodes_per_group)) { 608 /* 609 * When the compared inodes in inodes bitmap 610 * are 0, count the free inode, 611 * skip the current block group. 612 */ 613 first_free = 1; 614 inodes = fs->super->s_inodes_per_group - 1; 615 group_free = inodes; 616 free_inodes += inodes; 617 i += inodes; 618 skip_group = 0; 619 goto do_counts; 620 } 621 } 622 623 actual = ext2fs_fast_test_inode_bitmap2(ctx->inode_used_map, i); 624 if (redo_flag) 625 bitmap = actual; 626 else if (!skip_group) 627 bitmap = ext2fs_fast_test_inode_bitmap2(fs->inode_map, i); 628 if (!actual == !bitmap) 629 goto do_counts; 630 631 if (!actual && bitmap) { 632 /* 633 * Inode wasn't used, but marked in bitmap 634 */ 635 problem = PR_5_INODE_UNUSED; 636 } else /* if (actual && !bitmap) */ { 637 /* 638 * Inode used, but not in bitmap 639 */ 640 problem = PR_5_INODE_USED; 641 642 /* We should never hit this, because it means that 643 * inodes were marked in use that weren't noticed 644 * in pass1 or pass 2. It is easier to fix the problem 645 * than to kill e2fsck and leave the user stuck. */ 646 if (skip_group) { 647 struct problem_context pctx2; 648 pctx2.blk = i; 649 pctx2.group = group; 650 if (fix_problem(ctx, PR_5_INODE_UNINIT,&pctx2)){ 651 ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT); 652 skip_group = 0; 653 } 654 } 655 } 656 if (pctx.ino == 0) { 657 pctx.ino = pctx.ino2 = i; 658 save_problem = problem; 659 } else { 660 if ((problem == save_problem) && 661 (pctx.ino2 == i-1)) 662 pctx.ino2++; 663 else { 664 print_bitmap_problem(ctx, save_problem, &pctx); 665 pctx.ino = pctx.ino2 = i; 666 save_problem = problem; 667 } 668 } 669 ctx->flags |= E2F_FLAG_PROG_SUPPRESS; 670 had_problem++; 671 /* 672 * If there a problem we should turn off the discard so we 673 * do not compromise the filesystem. 674 */ 675 ctx->options &= ~E2F_OPT_DISCARD; 676 677 do_counts: 678 inodes++; 679 if (bitmap) { 680 if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i)) 681 dirs_count++; 682 if (inodes > first_free) { 683 e2fsck_discard_inodes(ctx, group, first_free, 684 inodes - first_free); 685 first_free = fs->super->s_inodes_per_group + 1; 686 } 687 } else { 688 group_free++; 689 free_inodes++; 690 if (first_free > inodes) 691 first_free = inodes; 692 } 693 694 if ((inodes == fs->super->s_inodes_per_group) || 695 (i == fs->super->s_inodes_count)) { 696 /* 697 * If the last inode is free, we can discard it as well. 698 */ 699 if (!bitmap && inodes >= first_free) 700 e2fsck_discard_inodes(ctx, group, first_free, 701 inodes - first_free + 1); 702 /* 703 * If discard zeroes data and the group inode table 704 * was not zeroed yet, set itable as zeroed 705 */ 706 if ((ctx->options & E2F_OPT_DISCARD) && 707 io_channel_discard_zeroes_data(fs->io) && 708 !(ext2fs_bg_flags_test(fs, group, 709 EXT2_BG_INODE_ZEROED))) { 710 ext2fs_bg_flags_set(fs, group, 711 EXT2_BG_INODE_ZEROED); 712 ext2fs_group_desc_csum_set(fs, group); 713 } 714 715 first_free = fs->super->s_inodes_per_group + 1; 716 free_array[group] = group_free; 717 dir_array[group] = dirs_count; 718 group ++; 719 inodes = 0; 720 skip_group = 0; 721 group_free = 0; 722 dirs_count = 0; 723 if (ctx->progress) 724 if ((ctx->progress)(ctx, 5, 725 group + fs->group_desc_count, 726 fs->group_desc_count*2)) 727 goto errout; 728 if (csum_flag && 729 (i != fs->super->s_inodes_count) && 730 (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT) 731 )) 732 skip_group++; 733 } 734 } 735 if (pctx.ino) 736 print_bitmap_problem(ctx, save_problem, &pctx); 737 738 if (had_problem) 739 fixit = end_problem_latch(ctx, PR_LATCH_IBITMAP); 740 else 741 fixit = -1; 742 ctx->flags &= ~E2F_FLAG_PROG_SUPPRESS; 743 744 if (fixit == 1) { 745 ext2fs_free_inode_bitmap(fs->inode_map); 746 retval = ext2fs_copy_bitmap(ctx->inode_used_map, 747 &fs->inode_map); 748 if (retval) { 749 clear_problem_context(&pctx); 750 fix_problem(ctx, PR_5_COPY_IBITMAP_ERROR, &pctx); 751 ctx->flags |= E2F_FLAG_ABORT; 752 goto errout; 753 } 754 ext2fs_set_bitmap_padding(fs->inode_map); 755 ext2fs_mark_ib_dirty(fs); 756 757 /* redo counts */ 758 inodes = 0; free_inodes = 0; group_free = 0; 759 dirs_count = 0; group = 0; 760 memset(free_array, 0, fs->group_desc_count * sizeof(int)); 761 memset(dir_array, 0, fs->group_desc_count * sizeof(int)); 762 redo_flag++; 763 goto redo_counts; 764 } else if (fixit == 0) 765 ext2fs_unmark_valid(fs); 766 767 for (i = 0; i < fs->group_desc_count; i++) { 768 if (free_array[i] != ext2fs_bg_free_inodes_count(fs, i)) { 769 pctx.group = i; 770 pctx.ino = ext2fs_bg_free_inodes_count(fs, i); 771 pctx.ino2 = free_array[i]; 772 if (fix_problem(ctx, PR_5_FREE_INODE_COUNT_GROUP, 773 &pctx)) { 774 ext2fs_bg_free_inodes_count_set(fs, i, free_array[i]); 775 ext2fs_mark_super_dirty(fs); 776 } else 777 ext2fs_unmark_valid(fs); 778 } 779 if (dir_array[i] != ext2fs_bg_used_dirs_count(fs, i)) { 780 pctx.group = i; 781 pctx.ino = ext2fs_bg_used_dirs_count(fs, i); 782 pctx.ino2 = dir_array[i]; 783 784 if (fix_problem(ctx, PR_5_FREE_DIR_COUNT_GROUP, 785 &pctx)) { 786 ext2fs_bg_used_dirs_count_set(fs, i, dir_array[i]); 787 ext2fs_mark_super_dirty(fs); 788 } else 789 ext2fs_unmark_valid(fs); 790 } 791 } 792 if (free_inodes != fs->super->s_free_inodes_count) { 793 pctx.group = -1; 794 pctx.ino = fs->super->s_free_inodes_count; 795 pctx.ino2 = free_inodes; 796 797 if (fix_problem(ctx, PR_5_FREE_INODE_COUNT, &pctx)) { 798 fs->super->s_free_inodes_count = free_inodes; 799 ext2fs_mark_super_dirty(fs); 800 } 801 } 802 errout: 803 ext2fs_free_mem(&free_array); 804 ext2fs_free_mem(&dir_array); 805 } 806 807 static void check_inode_end(e2fsck_t ctx) 808 { 809 ext2_filsys fs = ctx->fs; 810 ext2_ino_t end, save_inodes_count, i; 811 struct problem_context pctx; 812 813 clear_problem_context(&pctx); 814 815 end = EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count; 816 pctx.errcode = ext2fs_fudge_inode_bitmap_end(fs->inode_map, end, 817 &save_inodes_count); 818 if (pctx.errcode) { 819 pctx.num = 1; 820 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx); 821 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 822 return; 823 } 824 if (save_inodes_count == end) 825 return; 826 827 /* protect loop from wrap-around if end is maxed */ 828 for (i = save_inodes_count + 1; i <= end && i > save_inodes_count; i++) { 829 if (!ext2fs_test_inode_bitmap(fs->inode_map, i)) { 830 if (fix_problem(ctx, PR_5_INODE_BMAP_PADDING, &pctx)) { 831 for (; i <= end; i++) 832 ext2fs_mark_inode_bitmap(fs->inode_map, 833 i); 834 ext2fs_mark_ib_dirty(fs); 835 } else 836 ext2fs_unmark_valid(fs); 837 break; 838 } 839 } 840 841 pctx.errcode = ext2fs_fudge_inode_bitmap_end(fs->inode_map, 842 save_inodes_count, 0); 843 if (pctx.errcode) { 844 pctx.num = 2; 845 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx); 846 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 847 return; 848 } 849 } 850 851 static void check_block_end(e2fsck_t ctx) 852 { 853 ext2_filsys fs = ctx->fs; 854 blk64_t end, save_blocks_count, i; 855 struct problem_context pctx; 856 857 clear_problem_context(&pctx); 858 859 end = ext2fs_get_block_bitmap_start2(fs->block_map) + 860 ((blk64_t)EXT2_CLUSTERS_PER_GROUP(fs->super) * fs->group_desc_count) - 1; 861 pctx.errcode = ext2fs_fudge_block_bitmap_end2(fs->block_map, end, 862 &save_blocks_count); 863 if (pctx.errcode) { 864 pctx.num = 3; 865 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx); 866 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 867 return; 868 } 869 if (save_blocks_count == end) 870 return; 871 872 /* Protect loop from wrap-around if end is maxed */ 873 for (i = save_blocks_count + 1; i <= end && i > save_blocks_count; i++) { 874 if (!ext2fs_test_block_bitmap2(fs->block_map, 875 EXT2FS_C2B(fs, i))) { 876 if (fix_problem(ctx, PR_5_BLOCK_BMAP_PADDING, &pctx)) { 877 for (; i <= end; i++) 878 ext2fs_mark_block_bitmap2(fs->block_map, 879 EXT2FS_C2B(fs, i)); 880 ext2fs_mark_bb_dirty(fs); 881 } else 882 ext2fs_unmark_valid(fs); 883 break; 884 } 885 } 886 887 pctx.errcode = ext2fs_fudge_block_bitmap_end2(fs->block_map, 888 save_blocks_count, 0); 889 if (pctx.errcode) { 890 pctx.num = 4; 891 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx); 892 ctx->flags |= E2F_FLAG_ABORT; /* fatal */ 893 return; 894 } 895 } 896 897 898 899
