e2fsck/pass5.c

   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 "config.h"
  14 #include <stdint.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/ioctl.h>
  18 #include <fcntl.h>
  19 #include <errno.h>
  20
  21 #include "e2fsck.h"
  22 #include "problem.h"
  23
  24 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  25
  26 static void check_block_bitmaps(e2fsck_t ctx);
  27 static void check_inode_bitmaps(e2fsck_t ctx);
  28 static void check_inode_end(e2fsck_t ctx);
  29 static void check_block_end(e2fsck_t ctx);
  30
  31 void e2fsck_pass5(e2fsck_t ctx)
  32 {
  33 #ifdef RESOURCE_TRACK
  34         struct resource_track   rtrack;
  35 #endif
  36         struct problem_context  pctx;
  37
  38 #ifdef MTRACE
  39         mtrace_print("Pass 5");
  40 #endif
  41
  42         init_resource_track(&rtrack, ctx->fs->io);
  43         clear_problem_context(&pctx);
  44
  45         if (!(ctx->options & E2F_OPT_PREEN))
  46                 fix_problem(ctx, PR_5_PASS_HEADER, &pctx);
  47
  48         if (ctx->progress)
  49                 if ((ctx->progress)(ctx, 5, 0, ctx->fs->group_desc_count*2))
  50                         return;
  51
  52         e2fsck_read_bitmaps(ctx);
  53
  54         check_block_bitmaps(ctx);
  55         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  56                 return;
  57         check_inode_bitmaps(ctx);
  58         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  59                 return;
  60         check_inode_end(ctx);
  61         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  62                 return;
  63         check_block_end(ctx);
  64         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  65                 return;
  66
  67         ext2fs_free_inode_bitmap(ctx->inode_used_map);
  68         ctx->inode_used_map = 0;
  69         ext2fs_free_inode_bitmap(ctx->inode_dir_map);
  70         ctx->inode_dir_map = 0;
  71         ext2fs_free_block_bitmap(ctx->block_found_map);
  72         ctx->block_found_map = 0;
  73
  74         print_resource_track(ctx, _("Pass 5"), &rtrack, ctx->fs->io);
  75 }
  76
  77 static void e2fsck_discard_blocks(e2fsck_t ctx, blk64_t start,
  78                                   blk64_t count)
  79 {
  80         ext2_filsys fs = ctx->fs;
  81
  82         /*
  83          * If the filesystem has changed it means that there was an corruption
  84          * which should be repaired, but in some cases just one e2fsck run is
  85          * not enough to fix the problem, hence it is not safe to run discard
  86          * in this case.
  87          */
  88         if (ext2fs_test_changed(fs))
  89                 ctx->options &= ~E2F_OPT_DISCARD;
  90
  91         if ((ctx->options & E2F_OPT_DISCARD) &&
  92             (io_channel_discard(fs->io, start, count)))
  93                 ctx->options &= ~E2F_OPT_DISCARD;
  94 }
  95
  96 /*
  97  * This will try to discard number 'count' inodes starting at
  98  * inode number 'start' within the 'group'. Note that 'start'
  99  * is 1-based, it means that we need to adjust it by -1 in this
 100  * function to compute right offset in the particular inode table.
 101  */
 102 static void e2fsck_discard_inodes(e2fsck_t ctx, dgrp_t group,
 103                                   ext2_ino_t start, int count)
 104 {
 105         ext2_filsys fs = ctx->fs;
 106         blk64_t blk, num;
 107
 108         /*
 109          * Sanity check for 'start'
 110          */
 111         if ((start < 1) || (start > EXT2_INODES_PER_GROUP(fs->super))) {
 112                 printf("PROGRAMMING ERROR: Got start %d outside of group %d!"
 113                        " Disabling discard\n",
 114                         start, group);
 115                 ctx->options &= ~E2F_OPT_DISCARD;
 116         }
 117
 118         /*
 119          * Do not attempt to discard if E2F_OPT_DISCARD is not set. And also
 120          * skip the discard on this group if discard does not zero data.
 121          * The reason is that if the inode table is not zeroed discard would
 122          * no help us since we need to zero it anyway, or if the inode table
 123          * is zeroed then the read after discard would not be deterministic
 124          * anyway and we would not be able to assume that this inode table
 125          * was zeroed anymore so we would have to zero it again, which does
 126          * not really make sense.
 127          */
 128         if (!(ctx->options & E2F_OPT_DISCARD) ||
 129             !io_channel_discard_zeroes_data(fs->io))
 130                 return;
 131
 132         /*
 133          * Start is inode number within the group which starts
 134          * counting from 1, so we need to adjust it.
 135          */
 136         start -= 1;
 137
 138         /*
 139          * We can discard only blocks containing only unused
 140          * inodes in the table.
 141          */
 142         blk = DIV_ROUND_UP(start,
 143                 EXT2_INODES_PER_BLOCK(fs->super));
 144         count -= (blk * EXT2_INODES_PER_BLOCK(fs->super) - start);
 145         blk += ext2fs_inode_table_loc(fs, group);
 146         num = count / EXT2_INODES_PER_BLOCK(fs->super);
 147
 148         if (num > 0)
 149                 e2fsck_discard_blocks(ctx, blk, num);
 150 }
 151
 152 #define NO_BLK ((blk64_t) -1)
 153
 154 static void print_bitmap_problem(e2fsck_t ctx, int problem,
 155                             struct problem_context *pctx)
 156 {
 157         switch (problem) {
 158         case PR_5_BLOCK_UNUSED:
 159                 if (pctx->blk == pctx->blk2)
 160                         pctx->blk2 = 0;
 161                 else
 162                         problem = PR_5_BLOCK_RANGE_UNUSED;
 163                 break;
 164         case PR_5_BLOCK_USED:
 165                 if (pctx->blk == pctx->blk2)
 166                         pctx->blk2 = 0;
 167                 else
 168                         problem = PR_5_BLOCK_RANGE_USED;
 169                 break;
 170         case PR_5_INODE_UNUSED:
 171                 if (pctx->ino == pctx->ino2)
 172                         pctx->ino2 = 0;
 173                 else
 174                         problem = PR_5_INODE_RANGE_UNUSED;
 175                 break;
 176         case PR_5_INODE_USED:
 177                 if (pctx->ino == pctx->ino2)
 178                         pctx->ino2 = 0;
 179                 else
 180                         problem = PR_5_INODE_RANGE_USED;
 181                 break;
 182         }
 183         fix_problem(ctx, problem, pctx);
 184         pctx->blk = pctx->blk2 = NO_BLK;
 185         pctx->ino = pctx->ino2 = 0;
 186 }
 187
 188 /* Just to be more succint */
 189 #define B2C(x)  EXT2FS_B2C(fs, (x))
 190 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
 191 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
 192 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
 193
 194 static void check_block_bitmaps(e2fsck_t ctx)
 195 {
 196         ext2_filsys fs = ctx->fs;
 197         blk64_t i;
 198         unsigned int    *free_array;
 199         int     group = 0;
 200         unsigned int    blocks = 0;
 201         blk64_t free_blocks = 0;
 202         blk64_t first_free = ext2fs_blocks_count(fs->super);
 203         unsigned int    group_free = 0;
 204         int     actual, bitmap;
 205         struct problem_context  pctx;
 206         int     problem, save_problem, 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 += 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-1))
 414                                 pctx.blk2++;
 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 (i = 0; i < fs->group_desc_count; i++) {
 501                 if (free_array[i] != ext2fs_bg_free_blocks_count(fs, i)) {
 502                         pctx.group = i;
 503                         pctx.blk = ext2fs_bg_free_blocks_count(fs, i);
 504                         pctx.blk2 = free_array[i];
 505
 506                         if (fix_problem(ctx, PR_5_FREE_BLOCK_COUNT_GROUP,
 507                                         &pctx)) {
 508                                 ext2fs_bg_free_blocks_count_set(fs, i, free_array[i]);
 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         int             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         int             problem, save_problem, fixit, had_problem;
 546         int             csum_flag;
 547         int             skip_group = 0;
 548         int             redo_flag = 0;
 549         ext2_ino_t              first_free = fs->super->s_inodes_per_group + 1;
 550
 551         clear_problem_context(&pctx);
 552         free_array = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
 553             fs->group_desc_count * sizeof(ext2_ino_t), "free inode count array");
 554
 555         dir_array = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
 556            fs->group_desc_count * sizeof(ext2_ino_t), "directory count array");
 557
 558         if ((1 < ext2fs_get_inode_bitmap_start2(ctx->inode_used_map)) ||
 559             (fs->super->s_inodes_count >
 560              ext2fs_get_inode_bitmap_end2(ctx->inode_used_map))) {
 561                 pctx.num = 3;
 562                 pctx.blk = 1;
 563                 pctx.blk2 = fs->super->s_inodes_count;
 564                 pctx.ino = ext2fs_get_inode_bitmap_start2(ctx->inode_used_map);
 565                 pctx.ino2 = ext2fs_get_inode_bitmap_end2(ctx->inode_used_map);
 566                 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
 567
 568                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 569                 goto errout;
 570         }
 571         if ((1 < ext2fs_get_inode_bitmap_start2(fs->inode_map)) ||
 572             (fs->super->s_inodes_count >
 573              ext2fs_get_inode_bitmap_end2(fs->inode_map))) {
 574                 pctx.num = 4;
 575                 pctx.blk = 1;
 576                 pctx.blk2 = fs->super->s_inodes_count;
 577                 pctx.ino = ext2fs_get_inode_bitmap_start2(fs->inode_map);
 578                 pctx.ino2 = ext2fs_get_inode_bitmap_end2(fs->inode_map);
 579                 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
 580
 581                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 582                 goto errout;
 583         }
 584
 585         csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 586                                                EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
 587 redo_counts:
 588         had_problem = 0;
 589         save_problem = 0;
 590         pctx.ino = pctx.ino2 = 0;
 591         if (csum_flag &&
 592             (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)))
 593                 skip_group++;
 594
 595         /* Protect loop from wrap-around if inodes_count is maxed */
 596         for (i = 1; i <= fs->super->s_inodes_count && i > 0; i++) {
 597                 bitmap = 0;
 598                 if (skip_group &&
 599                     i % fs->super->s_inodes_per_group == 1) {
 600                         /*
 601                          * Current inode is the first inode
 602                          * in the current block group.
 603                          */
 604                         if (ext2fs_test_inode_bitmap_range(
 605                                     ctx->inode_used_map, i,
 606                                     fs->super->s_inodes_per_group)) {
 607                                 /*
 608                                  * When the compared inodes in inodes bitmap
 609                                  * are 0, count the free inode,
 610                                  * skip the current block group.
 611                                  */
 612                                 first_free = 1;
 613                                 inodes = fs->super->s_inodes_per_group - 1;
 614                                 group_free = inodes;
 615                                 free_inodes += inodes;
 616                                 i += inodes;
 617                                 skip_group = 0;
 618                                 goto do_counts;
 619                         }
 620                 }
 621
 622                 actual = ext2fs_fast_test_inode_bitmap2(ctx->inode_used_map, i);
 623                 if (redo_flag)
 624                         bitmap = actual;
 625                 else if (!skip_group)
 626                         bitmap = ext2fs_fast_test_inode_bitmap2(fs->inode_map, i);
 627                 if (!actual == !bitmap)
 628                         goto do_counts;
 629
 630                 if (!actual && bitmap) {
 631                         /*
 632                          * Inode wasn't used, but marked in bitmap
 633                          */
 634                         problem = PR_5_INODE_UNUSED;
 635                 } else /* if (actual && !bitmap) */ {
 636                         /*
 637                          * Inode used, but not in bitmap
 638                          */
 639                         problem = PR_5_INODE_USED;
 640
 641                         /* We should never hit this, because it means that
 642                          * inodes were marked in use that weren't noticed
 643                          * in pass1 or pass 2. It is easier to fix the problem
 644                          * than to kill e2fsck and leave the user stuck. */
 645                         if (skip_group) {
 646                                 struct problem_context pctx2;
 647                                 pctx2.blk = i;
 648                                 pctx2.group = group;
 649                                 if (fix_problem(ctx, PR_5_INODE_UNINIT,&pctx2)){
 650                                         ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
 651                                         skip_group = 0;
 652                                 }
 653                         }
 654                 }
 655                 if (pctx.ino == 0) {
 656                         pctx.ino = pctx.ino2 = i;
 657                         save_problem = problem;
 658                 } else {
 659                         if ((problem == save_problem) &&
 660                             (pctx.ino2 == i-1))
 661                                 pctx.ino2++;
 662                         else {
 663                                 print_bitmap_problem(ctx, save_problem, &pctx);
 664                                 pctx.ino = pctx.ino2 = i;
 665                                 save_problem = problem;
 666                         }
 667                 }
 668                 ctx->flags |= E2F_FLAG_PROG_SUPPRESS;
 669                 had_problem++;
 670                 /*
 671                  * If there a problem we should turn off the discard so we
 672                  * do not compromise the filesystem.
 673                  */
 674                 ctx->options &= ~E2F_OPT_DISCARD;
 675
 676 do_counts:
 677                 inodes++;
 678                 if (bitmap) {
 679                         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i))
 680                                 dirs_count++;
 681                         if (inodes > first_free) {
 682                                 e2fsck_discard_inodes(ctx, group, first_free,
 683                                                       inodes - first_free);
 684                                 first_free = fs->super->s_inodes_per_group + 1;
 685                         }
 686                 } else {
 687                         group_free++;
 688                         free_inodes++;
 689                         if (first_free > inodes)
 690                                 first_free = inodes;
 691                 }
 692
 693                 if ((inodes == fs->super->s_inodes_per_group) ||
 694                     (i == fs->super->s_inodes_count)) {
 695                         /*
 696                          * If the last inode is free, we can discard it as well.
 697                          */
 698                         if (!bitmap && inodes >= first_free)
 699                                 e2fsck_discard_inodes(ctx, group, first_free,
 700                                                       inodes - first_free + 1);
 701                         /*
 702                          * If discard zeroes data and the group inode table
 703                          * was not zeroed yet, set itable as zeroed
 704                          */
 705                         if ((ctx->options & E2F_OPT_DISCARD) &&
 706                             io_channel_discard_zeroes_data(fs->io) &&
 707                             !(ext2fs_bg_flags_test(fs, group,
 708                                                    EXT2_BG_INODE_ZEROED))) {
 709                                 ext2fs_bg_flags_set(fs, group,
 710                                                     EXT2_BG_INODE_ZEROED);
 711                                 ext2fs_group_desc_csum_set(fs, group);
 712                         }
 713
 714                         first_free = fs->super->s_inodes_per_group + 1;
 715                         free_array[group] = group_free;
 716                         dir_array[group] = dirs_count;
 717                         group ++;
 718                         inodes = 0;
 719                         skip_group = 0;
 720                         group_free = 0;
 721                         dirs_count = 0;
 722                         if (ctx->progress)
 723                                 if ((ctx->progress)(ctx, 5,
 724                                             group + fs->group_desc_count,
 725                                             fs->group_desc_count*2))
 726                                         goto errout;
 727                         if (csum_flag &&
 728                             (i != fs->super->s_inodes_count) &&
 729                             (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)
 730                              ))
 731                                 skip_group++;
 732                 }
 733         }
 734         if (pctx.ino)
 735                 print_bitmap_problem(ctx, save_problem, &pctx);
 736
 737         if (had_problem)
 738                 fixit = end_problem_latch(ctx, PR_LATCH_IBITMAP);
 739         else
 740                 fixit = -1;
 741         ctx->flags &= ~E2F_FLAG_PROG_SUPPRESS;
 742
 743         if (fixit == 1) {
 744                 ext2fs_free_inode_bitmap(fs->inode_map);
 745                 retval = ext2fs_copy_bitmap(ctx->inode_used_map,
 746                                                   &fs->inode_map);
 747                 if (retval) {
 748                         clear_problem_context(&pctx);
 749                         fix_problem(ctx, PR_5_COPY_IBITMAP_ERROR, &pctx);
 750                         ctx->flags |= E2F_FLAG_ABORT;
 751                         goto errout;
 752                 }
 753                 ext2fs_set_bitmap_padding(fs->inode_map);
 754                 ext2fs_mark_ib_dirty(fs);
 755
 756                 /* redo counts */
 757                 inodes = 0; free_inodes = 0; group_free = 0;
 758                 dirs_count = 0; group = 0;
 759                 memset(free_array, 0, fs->group_desc_count * sizeof(int));
 760                 memset(dir_array, 0, fs->group_desc_count * sizeof(int));
 761                 redo_flag++;
 762                 goto redo_counts;
 763         } else if (fixit == 0)
 764                 ext2fs_unmark_valid(fs);
 765
 766         for (i = 0; i < fs->group_desc_count; i++) {
 767                 if (free_array[i] != ext2fs_bg_free_inodes_count(fs, i)) {
 768                         pctx.group = i;
 769                         pctx.ino = ext2fs_bg_free_inodes_count(fs, i);
 770                         pctx.ino2 = free_array[i];
 771                         if (fix_problem(ctx, PR_5_FREE_INODE_COUNT_GROUP,
 772                                         &pctx)) {
 773                                 ext2fs_bg_free_inodes_count_set(fs, i, free_array[i]);
 774                                 ext2fs_mark_super_dirty(fs);
 775                         } else
 776                                 ext2fs_unmark_valid(fs);
 777                 }
 778                 if (dir_array[i] != ext2fs_bg_used_dirs_count(fs, i)) {
 779                         pctx.group = i;
 780                         pctx.ino = ext2fs_bg_used_dirs_count(fs, i);
 781                         pctx.ino2 = dir_array[i];
 782
 783                         if (fix_problem(ctx, PR_5_FREE_DIR_COUNT_GROUP,
 784                                         &pctx)) {
 785                                 ext2fs_bg_used_dirs_count_set(fs, i, dir_array[i]);
 786                                 ext2fs_mark_super_dirty(fs);
 787                         } else
 788                                 ext2fs_unmark_valid(fs);
 789                 }
 790         }
 791         if (free_inodes != fs->super->s_free_inodes_count) {
 792                 pctx.group = -1;
 793                 pctx.ino = fs->super->s_free_inodes_count;
 794                 pctx.ino2 = free_inodes;
 795
 796                 if (fix_problem(ctx, PR_5_FREE_INODE_COUNT, &pctx)) {
 797                         fs->super->s_free_inodes_count = free_inodes;
 798                         ext2fs_mark_super_dirty(fs);
 799                 }
 800         }
 801 errout:
 802         ext2fs_free_mem(&free_array);
 803         ext2fs_free_mem(&dir_array);
 804 }
 805
 806 static void check_inode_end(e2fsck_t ctx)
 807 {
 808         ext2_filsys fs = ctx->fs;
 809         ext2_ino_t      end, save_inodes_count, i;
 810         struct problem_context  pctx;
 811
 812         clear_problem_context(&pctx);
 813
 814         end = EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count;
 815         pctx.errcode = ext2fs_fudge_inode_bitmap_end(fs->inode_map, end,
 816                                                      &save_inodes_count);
 817         if (pctx.errcode) {
 818                 pctx.num = 1;
 819                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 820                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 821                 return;
 822         }
 823         if (save_inodes_count == end)
 824                 return;
 825
 826         /* protect loop from wrap-around if end is maxed */
 827         for (i = save_inodes_count + 1; i <= end && i > save_inodes_count; i++) {
 828                 if (!ext2fs_test_inode_bitmap(fs->inode_map, i)) {
 829                         if (fix_problem(ctx, PR_5_INODE_BMAP_PADDING, &pctx)) {
 830                                 for (; i <= end; i++)
 831                                         ext2fs_mark_inode_bitmap(fs->inode_map,
 832                                                                  i);
 833                                 ext2fs_mark_ib_dirty(fs);
 834                         } else
 835                                 ext2fs_unmark_valid(fs);
 836                         break;
 837                 }
 838         }
 839
 840         pctx.errcode = ext2fs_fudge_inode_bitmap_end(fs->inode_map,
 841                                                      save_inodes_count, 0);
 842         if (pctx.errcode) {
 843                 pctx.num = 2;
 844                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 845                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 846                 return;
 847         }
 848 }
 849
 850 static void check_block_end(e2fsck_t ctx)
 851 {
 852         ext2_filsys fs = ctx->fs;
 853         blk64_t end, save_blocks_count, i;
 854         struct problem_context  pctx;
 855
 856         clear_problem_context(&pctx);
 857
 858         end = ext2fs_get_block_bitmap_start2(fs->block_map) +
 859                 ((blk64_t)EXT2_CLUSTERS_PER_GROUP(fs->super) * fs->group_desc_count) - 1;
 860         pctx.errcode = ext2fs_fudge_block_bitmap_end2(fs->block_map, end,
 861                                                      &save_blocks_count);
 862         if (pctx.errcode) {
 863                 pctx.num = 3;
 864                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 865                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 866                 return;
 867         }
 868         if (save_blocks_count == end)
 869                 return;
 870
 871         /* Protect loop from wrap-around if end is maxed */
 872         for (i = save_blocks_count + 1; i <= end && i > save_blocks_count; i++) {
 873                 if (!ext2fs_test_block_bitmap2(fs->block_map,
 874                                                EXT2FS_C2B(fs, i))) {
 875                         if (fix_problem(ctx, PR_5_BLOCK_BMAP_PADDING, &pctx)) {
 876                                 for (; i <= end; i++)
 877                                         ext2fs_mark_block_bitmap2(fs->block_map,
 878                                                         EXT2FS_C2B(fs, i));
 879                                 ext2fs_mark_bb_dirty(fs);
 880                         } else
 881                                 ext2fs_unmark_valid(fs);
 882                         break;
 883                 }
 884         }
 885
 886         pctx.errcode = ext2fs_fudge_block_bitmap_end2(fs->block_map,
 887                                                      save_blocks_count, 0);
 888         if (pctx.errcode) {
 889                 pctx.num = 4;
 890                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 891                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 892                 return;
 893         }
 894 }
 895
 896
 897