e2fsck/super.c

   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
  25 static 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  */
  44 struct 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
  56 static 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  */
 153 static 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  */
 225 static 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;
 297 return_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  */
 308 void 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
 423 cleanup:
 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  */
 432 static 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
 457 void 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
 891 int 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 }