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 "e2fsck.h"
  14 #include "problem.h"
  15
  16 static void check_block_bitmaps(e2fsck_t ctx);
  17 static void check_inode_bitmaps(e2fsck_t ctx);
  18 static void check_inode_end(e2fsck_t ctx);
  19 static void check_block_end(e2fsck_t ctx);
  20
  21 void e2fsck_pass5(e2fsck_t ctx)
  22 {
  23 #ifdef RESOURCE_TRACK
  24         struct resource_track   rtrack;
  25 #endif
  26         struct problem_context  pctx;
  27
  28 #ifdef MTRACE
  29         mtrace_print("Pass 5");
  30 #endif
  31
  32 #ifdef RESOURCE_TRACK
  33         init_resource_track(&rtrack);
  34 #endif
  35
  36         clear_problem_context(&pctx);
  37
  38         if (!(ctx->options & E2F_OPT_PREEN))
  39                 fix_problem(ctx, PR_5_PASS_HEADER, &pctx);
  40
  41         if (ctx->progress)
  42                 if ((ctx->progress)(ctx, 5, 0, ctx->fs->group_desc_count*2))
  43                         return;
  44
  45         e2fsck_read_bitmaps(ctx);
  46
  47         check_block_bitmaps(ctx);
  48         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  49                 return;
  50         check_inode_bitmaps(ctx);
  51         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  52                 return;
  53         check_inode_end(ctx);
  54         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  55                 return;
  56         check_block_end(ctx);
  57         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  58                 return;
  59
  60         ext2fs_free_inode_bitmap(ctx->inode_used_map);
  61         ctx->inode_used_map = 0;
  62         ext2fs_free_inode_bitmap(ctx->inode_dir_map);
  63         ctx->inode_dir_map = 0;
  64         ext2fs_free_block_bitmap(ctx->block_found_map);
  65         ctx->block_found_map = 0;
  66
  67 #ifdef RESOURCE_TRACK
  68         if (ctx->options & E2F_OPT_TIME2) {
  69                 e2fsck_clear_progbar(ctx);
  70                 print_resource_track("Pass 5", &rtrack);
  71         }
  72 #endif
  73 }
  74
  75 static void check_block_bitmaps(e2fsck_t ctx)
  76 {
  77         ext2_filsys fs = ctx->fs;
  78         blk_t   i;
  79         int     *free_array;
  80         int     group = 0;
  81         int     blocks = 0;
  82         int     free_blocks = 0;
  83         int     group_free = 0;
  84         int     actual, bitmap;
  85         struct problem_context  pctx;
  86         int     problem, fixit, had_problem;
  87         errcode_t       retval;
  88
  89         clear_problem_context(&pctx);
  90         free_array = (int *) e2fsck_allocate_memory(ctx,
  91             fs->group_desc_count * sizeof(int), "free block count array");
  92
  93         if ((fs->super->s_first_data_block <
  94              ext2fs_get_block_bitmap_start(ctx->block_found_map)) ||
  95             (fs->super->s_blocks_count-1 >
  96              ext2fs_get_block_bitmap_end(ctx->block_found_map))) {
  97                 pctx.num = 1;
  98                 pctx.blk = fs->super->s_first_data_block;
  99                 pctx.blk2 = fs->super->s_blocks_count -1;
 100                 pctx.ino = ext2fs_get_block_bitmap_start(ctx->block_found_map);
 101                 pctx.ino2 = ext2fs_get_block_bitmap_end(ctx->block_found_map);
 102                 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
 103
 104                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 105                 return;
 106         }
 107
 108         if ((fs->super->s_first_data_block <
 109              ext2fs_get_block_bitmap_start(fs->block_map)) ||
 110             (fs->super->s_blocks_count-1 >
 111              ext2fs_get_block_bitmap_end(fs->block_map))) {
 112                 pctx.num = 2;
 113                 pctx.blk = fs->super->s_first_data_block;
 114                 pctx.blk2 = fs->super->s_blocks_count -1;
 115                 pctx.ino = ext2fs_get_block_bitmap_start(fs->block_map);
 116                 pctx.ino2 = ext2fs_get_block_bitmap_end(fs->block_map);
 117                 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
 118
 119                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 120                 return;
 121         }
 122
 123 redo_counts:
 124         had_problem = 0;
 125         for (i = fs->super->s_first_data_block;
 126              i < fs->super->s_blocks_count;
 127              i++) {
 128                 actual = ext2fs_fast_test_block_bitmap(ctx->block_found_map, i);
 129                 bitmap = ext2fs_fast_test_block_bitmap(fs->block_map, i);
 130
 131                 if (actual == bitmap)
 132                         goto do_counts;
 133
 134                 if (!actual && bitmap) {
 135                         /*
 136                          * Block not used, but marked in use in the bitmap.
 137                          */
 138                         problem = PR_5_UNUSED_BLOCK;
 139                 } else {
 140                         /*
 141                          * Block used, but not marked in use in the bitmap.
 142                          */
 143                         problem = PR_5_BLOCK_USED;
 144                 }
 145                 pctx.blk = i;
 146                 fix_problem(ctx, problem, &pctx);
 147                 ctx->flags |= E2F_FLAG_PROG_SUPPRESS;
 148                 had_problem++;
 149
 150         do_counts:
 151                 if (!bitmap) {
 152                         group_free++;
 153                         free_blocks++;
 154                 }
 155                 blocks ++;
 156                 if ((blocks == fs->super->s_blocks_per_group) ||
 157                     (i == fs->super->s_blocks_count-1)) {
 158                         free_array[group] = group_free;
 159                         group ++;
 160                         blocks = 0;
 161                         group_free = 0;
 162                         if (ctx->progress)
 163                                 if ((ctx->progress)(ctx, 5, group,
 164                                                     fs->group_desc_count*2))
 165                                         return;
 166                 }
 167         }
 168         if (had_problem)
 169                 fixit = end_problem_latch(ctx,  PR_LATCH_BBITMAP);
 170         else
 171                 fixit = -1;
 172         ctx->flags &= ~E2F_FLAG_PROG_SUPPRESS;
 173
 174         if (fixit == 1) {
 175                 ext2fs_free_block_bitmap(fs->block_map);
 176                 retval = ext2fs_copy_bitmap(ctx->block_found_map,
 177                                                   &fs->block_map);
 178                 /* XXX check retval --- should never fail! */
 179                 ext2fs_set_bitmap_padding(fs->block_map);
 180                 ext2fs_mark_bb_dirty(fs);
 181
 182                 /* Redo the counts */
 183                 blocks = 0; free_blocks = 0; group_free = 0; group = 0;
 184                 memset(free_array, 0, fs->group_desc_count * sizeof(int));
 185                 goto redo_counts;
 186         } else if (fixit == 0)
 187                 ext2fs_unmark_valid(fs);
 188
 189         for (i = 0; i < fs->group_desc_count; i++) {
 190                 if (free_array[i] != fs->group_desc[i].bg_free_blocks_count) {
 191                         pctx.group = i;
 192                         pctx.blk = fs->group_desc[i].bg_free_blocks_count;
 193                         pctx.blk2 = free_array[i];
 194
 195                         if (fix_problem(ctx, PR_5_FREE_BLOCK_COUNT_GROUP,
 196                                         &pctx)) {
 197                                 fs->group_desc[i].bg_free_blocks_count =
 198                                         free_array[i];
 199                                 ext2fs_mark_super_dirty(fs);
 200                         } else
 201                                 ext2fs_unmark_valid(fs);
 202                 }
 203         }
 204         if (free_blocks != fs->super->s_free_blocks_count) {
 205                 pctx.group = 0;
 206                 pctx.blk = fs->super->s_free_blocks_count;
 207                 pctx.blk2 = free_blocks;
 208
 209                 if (fix_problem(ctx, PR_5_FREE_BLOCK_COUNT, &pctx)) {
 210                         fs->super->s_free_blocks_count = free_blocks;
 211                         ext2fs_mark_super_dirty(fs);
 212                 } else
 213                         ext2fs_unmark_valid(fs);
 214         }
 215         ext2fs_free_mem((void **) &free_array);
 216 }
 217
 218 static void check_inode_bitmaps(e2fsck_t ctx)
 219 {
 220         ext2_filsys fs = ctx->fs;
 221         ino_t   i;
 222         int     free_inodes = 0;
 223         int     group_free = 0;
 224         int     dirs_count = 0;
 225         int     group = 0;
 226         int     inodes = 0;
 227         int     *free_array;
 228         int     *dir_array;
 229         int     actual, bitmap;
 230         errcode_t       retval;
 231         struct problem_context  pctx;
 232         int     problem, fixit, had_problem;
 233
 234         clear_problem_context(&pctx);
 235         free_array = (int *) e2fsck_allocate_memory(ctx,
 236             fs->group_desc_count * sizeof(int), "free inode count array");
 237
 238         dir_array = (int *) e2fsck_allocate_memory(ctx,
 239            fs->group_desc_count * sizeof(int), "directory count array");
 240
 241         if ((1 < ext2fs_get_inode_bitmap_start(ctx->inode_used_map)) ||
 242             (fs->super->s_inodes_count >
 243              ext2fs_get_inode_bitmap_end(ctx->inode_used_map))) {
 244                 pctx.num = 3;
 245                 pctx.blk = 1;
 246                 pctx.blk2 = fs->super->s_inodes_count;
 247                 pctx.ino = ext2fs_get_inode_bitmap_start(ctx->inode_used_map);
 248                 pctx.ino2 = ext2fs_get_inode_bitmap_end(ctx->inode_used_map);
 249                 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
 250
 251                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 252                 return;
 253         }
 254         if ((1 < ext2fs_get_inode_bitmap_start(fs->inode_map)) ||
 255             (fs->super->s_inodes_count >
 256              ext2fs_get_inode_bitmap_end(fs->inode_map))) {
 257                 pctx.num = 4;
 258                 pctx.blk = 1;
 259                 pctx.blk2 = fs->super->s_inodes_count;
 260                 pctx.ino = ext2fs_get_inode_bitmap_start(fs->inode_map);
 261                 pctx.ino2 = ext2fs_get_inode_bitmap_end(fs->inode_map);
 262                 fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);
 263
 264                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 265                 return;
 266         }
 267
 268 redo_counts:
 269         had_problem = 0;
 270         for (i = 1; i <= fs->super->s_inodes_count; i++) {
 271                 actual = ext2fs_fast_test_inode_bitmap(ctx->inode_used_map, i);
 272                 bitmap = ext2fs_fast_test_inode_bitmap(fs->inode_map, i);
 273
 274                 if (actual == bitmap)
 275                         goto do_counts;
 276
 277                 if (!actual && bitmap) {
 278                         /*
 279                          * Inode wasn't used, but marked in bitmap
 280                          */
 281                         problem = PR_5_UNUSED_INODE;
 282                 } else /* if (actual && !bitmap) */ {
 283                         /*
 284                          * Inode used, but not in bitmap
 285                          */
 286                         problem = PR_5_INODE_USED;
 287                 }
 288                 pctx.ino = i;
 289                 fix_problem(ctx, problem, &pctx);
 290                 ctx->flags |= E2F_FLAG_PROG_SUPPRESS;
 291                 had_problem++;
 292
 293 do_counts:
 294                 if (!bitmap) {
 295                         group_free++;
 296                         free_inodes++;
 297                 } else {
 298                         if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, i))
 299                                 dirs_count++;
 300                 }
 301                 inodes++;
 302                 if ((inodes == fs->super->s_inodes_per_group) ||
 303                     (i == fs->super->s_inodes_count)) {
 304                         free_array[group] = group_free;
 305                         dir_array[group] = dirs_count;
 306                         group ++;
 307                         inodes = 0;
 308                         group_free = 0;
 309                         dirs_count = 0;
 310                         if (ctx->progress)
 311                                 if ((ctx->progress)(ctx, 5,
 312                                             group + fs->group_desc_count,
 313                                             fs->group_desc_count*2))
 314                                         return;
 315                 }
 316         }
 317         if (had_problem)
 318                 fixit = end_problem_latch(ctx, PR_LATCH_IBITMAP);
 319         else
 320                 fixit = -1;
 321         ctx->flags &= ~E2F_FLAG_PROG_SUPPRESS;
 322
 323         if (fixit == 1) {
 324                 ext2fs_free_inode_bitmap(fs->inode_map);
 325                 retval = ext2fs_copy_bitmap(ctx->inode_used_map,
 326                                                   &fs->inode_map);
 327                 /* XXX check retval --- should never fail! */
 328                 ext2fs_set_bitmap_padding(fs->inode_map);
 329                 ext2fs_mark_ib_dirty(fs);
 330
 331                 /* redo counts */
 332                 inodes = 0; free_inodes = 0; group_free = 0;
 333                 dirs_count = 0; group = 0;
 334                 memset(free_array, 0, fs->group_desc_count * sizeof(int));
 335                 memset(dir_array, 0, fs->group_desc_count * sizeof(int));
 336                 goto redo_counts;
 337         } else if (fixit == 0)
 338                 ext2fs_unmark_valid(fs);
 339
 340         for (i = 0; i < fs->group_desc_count; i++) {
 341                 if (free_array[i] != fs->group_desc[i].bg_free_inodes_count) {
 342                         pctx.group = i;
 343                         pctx.ino = fs->group_desc[i].bg_free_inodes_count;
 344                         pctx.ino2 = free_array[i];
 345                         if (fix_problem(ctx, PR_5_FREE_INODE_COUNT_GROUP,
 346                                         &pctx)) {
 347                                 fs->group_desc[i].bg_free_inodes_count =
 348                                         free_array[i];
 349                                 ext2fs_mark_super_dirty(fs);
 350                         } else
 351                                 ext2fs_unmark_valid(fs);
 352                 }
 353                 if (dir_array[i] != fs->group_desc[i].bg_used_dirs_count) {
 354                         pctx.group = i;
 355                         pctx.ino = fs->group_desc[i].bg_used_dirs_count;
 356                         pctx.ino2 = dir_array[i];
 357
 358                         if (fix_problem(ctx, PR_5_FREE_DIR_COUNT_GROUP,
 359                                         &pctx)) {
 360                                 fs->group_desc[i].bg_used_dirs_count =
 361                                         dir_array[i];
 362                                 ext2fs_mark_super_dirty(fs);
 363                         } else
 364                                 ext2fs_unmark_valid(fs);
 365                 }
 366         }
 367         if (free_inodes != fs->super->s_free_inodes_count) {
 368                 pctx.group = -1;
 369                 pctx.ino = fs->super->s_free_inodes_count;
 370                 pctx.ino2 = free_inodes;
 371
 372                 if (fix_problem(ctx, PR_5_FREE_INODE_COUNT, &pctx)) {
 373                         fs->super->s_free_inodes_count = free_inodes;
 374                         ext2fs_mark_super_dirty(fs);
 375                 } else
 376                         ext2fs_unmark_valid(fs);
 377         }
 378         ext2fs_free_mem((void **) &free_array);
 379         ext2fs_free_mem((void **) &dir_array);
 380 }
 381
 382 static void check_inode_end(e2fsck_t ctx)
 383 {
 384         ext2_filsys fs = ctx->fs;
 385         ino_t   end, save_inodes_count, i;
 386         struct problem_context  pctx;
 387
 388         clear_problem_context(&pctx);
 389
 390         end = EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count;
 391         pctx.errcode = ext2fs_fudge_inode_bitmap_end(fs->inode_map, end,
 392                                                      &save_inodes_count);
 393         if (pctx.errcode) {
 394                 pctx.num = 1;
 395                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 396                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 397                 return;
 398         }
 399         if (save_inodes_count == end)
 400                 return;
 401
 402         for (i = save_inodes_count + 1; i <= end; i++) {
 403                 if (!ext2fs_test_inode_bitmap(fs->inode_map, i)) {
 404                         if (fix_problem(ctx, PR_5_INODE_BMAP_PADDING, &pctx)) {
 405                                 for (i = save_inodes_count + 1; i <= end; i++)
 406                                         ext2fs_mark_inode_bitmap(fs->inode_map,
 407                                                                  i);
 408                                 ext2fs_mark_ib_dirty(fs);
 409                         } else
 410                                 ext2fs_unmark_valid(fs);
 411                         break;
 412                 }
 413         }
 414
 415         pctx.errcode = ext2fs_fudge_inode_bitmap_end(fs->inode_map,
 416                                                      save_inodes_count, 0);
 417         if (pctx.errcode) {
 418                 pctx.num = 2;
 419                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 420                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 421                 return;
 422         }
 423 }
 424
 425 static void check_block_end(e2fsck_t ctx)
 426 {
 427         ext2_filsys fs = ctx->fs;
 428         blk_t   end, save_blocks_count, i;
 429         struct problem_context  pctx;
 430
 431         clear_problem_context(&pctx);
 432
 433         end = fs->block_map->start +
 434                 (EXT2_BLOCKS_PER_GROUP(fs->super) * fs->group_desc_count) - 1;
 435         pctx.errcode = ext2fs_fudge_block_bitmap_end(fs->block_map, end,
 436                                                      &save_blocks_count);
 437         if (pctx.errcode) {
 438                 pctx.num = 3;
 439                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 440                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 441                 return;
 442         }
 443         if (save_blocks_count == end)
 444                 return;
 445
 446         for (i = save_blocks_count + 1; i <= end; i++) {
 447                 if (!ext2fs_test_block_bitmap(fs->block_map, i)) {
 448                         if (fix_problem(ctx, PR_5_BLOCK_BMAP_PADDING, &pctx)) {
 449                                 for (i = save_blocks_count + 1; i <= end; i++)
 450                                         ext2fs_mark_block_bitmap(fs->block_map,
 451                                                                  i);
 452                                 ext2fs_mark_bb_dirty(fs);
 453                         } else
 454                                 ext2fs_unmark_valid(fs);
 455                         break;
 456                 }
 457         }
 458
 459         pctx.errcode = ext2fs_fudge_block_bitmap_end(fs->block_map,
 460                                                      save_blocks_count, 0);
 461         if (pctx.errcode) {
 462                 pctx.num = 4;
 463                 fix_problem(ctx, PR_5_FUDGE_BITMAP_ERROR, &pctx);
 464                 ctx->flags |= E2F_FLAG_ABORT; /* fatal */
 465                 return;
 466         }
 467 }
 468
 469
 470