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 #include "config.h"
  13 #ifdef HAVE_ERRNO_H
  14 #include <errno.h>
  15 #endif
  16
  17 #ifndef EXT2_SKIP_UUID
  18 #include "uuid/uuid.h"
  19 #endif
  20 #include "e2fsck.h"
  21 #include "problem.h"
  22
  23 #define MIN_CHECK 1
  24 #define MAX_CHECK 2
  25
  26 static void check_super_value(e2fsck_t ctx, const char *descr,
  27                               unsigned long value, int flags,
  28                               unsigned long min_val, unsigned long max_val)
  29 {
  30         struct          problem_context pctx;
  31
  32         if (((flags & MIN_CHECK) && (value < min_val)) ||
  33             ((flags & MAX_CHECK) && (value > max_val))) {
  34                 clear_problem_context(&pctx);
  35                 pctx.num = value;
  36                 pctx.str = descr;
  37                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
  38                 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
  39         }
  40 }
  41
  42 /*
  43  * helper function to release an inode
  44  */
  45 struct process_block_struct {
  46         e2fsck_t        ctx;
  47         char            *buf;
  48         struct problem_context *pctx;
  49         int             truncating;
  50         int             truncate_offset;
  51         e2_blkcnt_t     truncate_block;
  52         int             truncated_blocks;
  53         int             abort;
  54         errcode_t       errcode;
  55 };
  56
  57 static int release_inode_block(ext2_filsys fs,
  58                                blk64_t  *block_nr,
  59                                e2_blkcnt_t blockcnt,
  60                                blk64_t  ref_blk EXT2FS_ATTR((unused)),
  61                                int      ref_offset EXT2FS_ATTR((unused)),
  62                                void *priv_data)
  63 {
  64         struct process_block_struct *pb;
  65         e2fsck_t                ctx;
  66         struct problem_context  *pctx;
  67         blk64_t                 blk = *block_nr;
  68         int                     retval = 0;
  69
  70         pb = (struct process_block_struct *) priv_data;
  71         ctx = pb->ctx;
  72         pctx = pb->pctx;
  73
  74         pctx->blk = blk;
  75         pctx->blkcount = blockcnt;
  76
  77         if (HOLE_BLKADDR(blk))
  78                 return 0;
  79
  80         if ((blk < fs->super->s_first_data_block) ||
  81             (blk >= ext2fs_blocks_count(fs->super))) {
  82                 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
  83         return_abort:
  84                 pb->abort = 1;
  85                 return BLOCK_ABORT;
  86         }
  87
  88         if (!ext2fs_test_block_bitmap2(fs->block_map, blk)) {
  89                 fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx);
  90                 goto return_abort;
  91         }
  92
  93         /*
  94          * If we are deleting an orphan, then we leave the fields alone.
  95          * If we are truncating an orphan, then update the inode fields
  96          * and clean up any partial block data.
  97          */
  98         if (pb->truncating) {
  99                 /*
 100                  * We only remove indirect blocks if they are
 101                  * completely empty.
 102                  */
 103                 if (blockcnt < 0) {
 104                         int     i, limit;
 105                         blk_t   *bp;
 106
 107                         pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
 108                                                         pb->buf);
 109                         if (pb->errcode)
 110                                 goto return_abort;
 111
 112                         limit = fs->blocksize >> 2;
 113                         for (i = 0, bp = (blk_t *) pb->buf;
 114                              i < limit;  i++, bp++)
 115                                 if (*bp)
 116                                         return 0;
 117                 }
 118                 /*
 119                  * We don't remove direct blocks until we've reached
 120                  * the truncation block.
 121                  */
 122                 if (blockcnt >= 0 && blockcnt < pb->truncate_block)
 123                         return 0;
 124                 /*
 125                  * If part of the last block needs truncating, we do
 126                  * it here.
 127                  */
 128                 if ((blockcnt == pb->truncate_block) && pb->truncate_offset) {
 129                         pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
 130                                                         pb->buf);
 131                         if (pb->errcode)
 132                                 goto return_abort;
 133                         memset(pb->buf + pb->truncate_offset, 0,
 134                                fs->blocksize - pb->truncate_offset);
 135                         pb->errcode = io_channel_write_blk64(fs->io, blk, 1,
 136                                                          pb->buf);
 137                         if (pb->errcode)
 138                                 goto return_abort;
 139                 }
 140                 pb->truncated_blocks++;
 141                 *block_nr = 0;
 142                 retval |= BLOCK_CHANGED;
 143         }
 144
 145         ext2fs_block_alloc_stats2(fs, blk, -1);
 146         return retval;
 147 }
 148
 149 /*
 150  * This function releases an inode.  Returns 1 if an inconsistency was
 151  * found.  If the inode has a link count, then it is being truncated and
 152  * not deleted.
 153  */
 154 static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
 155                                 struct ext2_inode *inode, char *block_buf,
 156                                 struct problem_context *pctx)
 157 {
 158         struct process_block_struct     pb;
 159         ext2_filsys                     fs = ctx->fs;
 160         errcode_t                       retval;
 161         __u32                           count;
 162
 163         if (!ext2fs_inode_has_valid_blocks2(fs, inode))
 164                 return 0;
 165
 166         pb.buf = block_buf + 3 * ctx->fs->blocksize;
 167         pb.ctx = ctx;
 168         pb.abort = 0;
 169         pb.errcode = 0;
 170         pb.pctx = pctx;
 171         if (inode->i_links_count) {
 172                 pb.truncating = 1;
 173                 pb.truncate_block = (e2_blkcnt_t)
 174                         ((EXT2_I_SIZE(inode) + fs->blocksize - 1) /
 175                          fs->blocksize);
 176                 pb.truncate_offset = inode->i_size % fs->blocksize;
 177         } else {
 178                 pb.truncating = 0;
 179                 pb.truncate_block = 0;
 180                 pb.truncate_offset = 0;
 181         }
 182         pb.truncated_blocks = 0;
 183         retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE,
 184                                       block_buf, release_inode_block, &pb);
 185         if (retval) {
 186                 com_err("release_inode_blocks", retval,
 187                         _("while calling ext2fs_block_iterate for inode %d"),
 188                         ino);
 189                 return 1;
 190         }
 191         if (pb.abort)
 192                 return 1;
 193
 194         /* Refresh the inode since ext2fs_block_iterate may have changed it */
 195         e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks");
 196
 197         if (pb.truncated_blocks)
 198                 ext2fs_iblk_sub_blocks(fs, inode, pb.truncated_blocks);
 199
 200         if (ext2fs_file_acl_block(fs, inode)) {
 201                 retval = ext2fs_adjust_ea_refcount2(fs,
 202                                         ext2fs_file_acl_block(fs, inode),
 203                                         block_buf, -1, &count);
 204                 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
 205                         retval = 0;
 206                         count = 1;
 207                 }
 208                 if (retval) {
 209                         com_err("release_inode_blocks", retval,
 210                 _("while calling ext2fs_adjust_ea_refcount2 for inode %d"),
 211                                 ino);
 212                         return 1;
 213                 }
 214                 if (count == 0)
 215                         ext2fs_block_alloc_stats2(fs,
 216                                         ext2fs_file_acl_block(fs, inode), -1);
 217                 ext2fs_file_acl_block_set(fs, inode, 0);
 218         }
 219         return 0;
 220 }
 221
 222 /*
 223  * This function releases all of the orphan inodes.  It returns 1 if
 224  * it hit some error, and 0 on success.
 225  */
 226 static int release_orphan_inodes(e2fsck_t ctx)
 227 {
 228         ext2_filsys fs = ctx->fs;
 229         ext2_ino_t      ino, next_ino;
 230         struct ext2_inode inode;
 231         struct problem_context pctx;
 232         char *block_buf;
 233
 234         if ((ino = fs->super->s_last_orphan) == 0)
 235                 return 0;
 236
 237         /*
 238          * Win or lose, we won't be using the head of the orphan inode
 239          * list again.
 240          */
 241         fs->super->s_last_orphan = 0;
 242         ext2fs_mark_super_dirty(fs);
 243
 244         /*
 245          * If the filesystem contains errors, don't run the orphan
 246          * list, since the orphan list can't be trusted; and we're
 247          * going to be running a full e2fsck run anyway...
 248          */
 249         if (fs->super->s_state & EXT2_ERROR_FS)
 250                 return 0;
 251
 252         if ((ino < EXT2_FIRST_INODE(fs->super)) ||
 253             (ino > fs->super->s_inodes_count)) {
 254                 clear_problem_context(&pctx);
 255                 pctx.ino = ino;
 256                 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
 257                 return 1;
 258         }
 259
 260         block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
 261                                                     "block iterate buffer");
 262         e2fsck_read_bitmaps(ctx);
 263
 264         while (ino) {
 265                 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
 266                 clear_problem_context(&pctx);
 267                 pctx.ino = ino;
 268                 pctx.inode = &inode;
 269                 pctx.str = inode.i_links_count ? _("Truncating") :
 270                         _("Clearing");
 271
 272                 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
 273
 274                 next_ino = inode.i_dtime;
 275                 if (next_ino &&
 276                     ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
 277                      (next_ino > fs->super->s_inodes_count))) {
 278                         pctx.ino = next_ino;
 279                         fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
 280                         goto return_abort;
 281                 }
 282
 283                 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
 284                         goto return_abort;
 285
 286                 if (!inode.i_links_count) {
 287                         ext2fs_inode_alloc_stats2(fs, ino, -1,
 288                                                   LINUX_S_ISDIR(inode.i_mode));
 289                         inode.i_dtime = ctx->now;
 290                 } else {
 291                         inode.i_dtime = 0;
 292                 }
 293                 e2fsck_write_inode(ctx, ino, &inode, "delete_file");
 294                 ino = next_ino;
 295         }
 296         ext2fs_free_mem(&block_buf);
 297         return 0;
 298 return_abort:
 299         ext2fs_free_mem(&block_buf);
 300         return 1;
 301 }
 302
 303 /*
 304  * Check the resize inode to make sure it is sane.  We check both for
 305  * the case where on-line resizing is not enabled (in which case the
 306  * resize inode should be cleared) as well as the case where on-line
 307  * resizing is enabled.
 308  */
 309 void check_resize_inode(e2fsck_t ctx)
 310 {
 311         ext2_filsys fs = ctx->fs;
 312         struct ext2_inode inode;
 313         struct problem_context  pctx;
 314         int             i, gdt_off, ind_off;
 315         dgrp_t          j;
 316         blk64_t         blk, pblk, expect;
 317         __u32           *dind_buf = 0, *ind_buf;
 318         errcode_t       retval;
 319
 320         clear_problem_context(&pctx);
 321
 322         /*
 323          * If the resize inode feature isn't set, then
 324          * s_reserved_gdt_blocks must be zero.
 325          */
 326         if (!(fs->super->s_feature_compat &
 327               EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
 328                 if (fs->super->s_reserved_gdt_blocks) {
 329                         pctx.num = fs->super->s_reserved_gdt_blocks;
 330                         if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS,
 331                                         &pctx)) {
 332                                 fs->super->s_reserved_gdt_blocks = 0;
 333                                 ext2fs_mark_super_dirty(fs);
 334                         }
 335                 }
 336         }
 337
 338         /* Read the resize inode */
 339         pctx.ino = EXT2_RESIZE_INO;
 340         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
 341         if (retval) {
 342                 if (fs->super->s_feature_compat &
 343                     EXT2_FEATURE_COMPAT_RESIZE_INODE)
 344                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 345                 return;
 346         }
 347
 348         /*
 349          * If the resize inode feature isn't set, check to make sure
 350          * the resize inode is cleared; then we're done.
 351          */
 352         if (!(fs->super->s_feature_compat &
 353               EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
 354                 for (i=0; i < EXT2_N_BLOCKS; i++) {
 355                         if (inode.i_block[i])
 356                                 break;
 357                 }
 358                 if ((i < EXT2_N_BLOCKS) &&
 359                     fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) {
 360                         memset(&inode, 0, sizeof(inode));
 361                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 362                                            "clear_resize");
 363                 }
 364                 return;
 365         }
 366
 367         /*
 368          * The resize inode feature is enabled; check to make sure the
 369          * only block in use is the double indirect block
 370          */
 371         blk = inode.i_block[EXT2_DIND_BLOCK];
 372         for (i=0; i < EXT2_N_BLOCKS; i++) {
 373                 if (i != EXT2_DIND_BLOCK && inode.i_block[i])
 374                         break;
 375         }
 376         if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count ||
 377             !(inode.i_mode & LINUX_S_IFREG) ||
 378             (blk < fs->super->s_first_data_block ||
 379              blk >= ext2fs_blocks_count(fs->super))) {
 380         resize_inode_invalid:
 381                 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) {
 382                         memset(&inode, 0, sizeof(inode));
 383                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 384                                            "clear_resize");
 385                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 386                 }
 387                 if (!(ctx->options & E2F_OPT_READONLY)) {
 388                         fs->super->s_state &= ~EXT2_VALID_FS;
 389                         ext2fs_mark_super_dirty(fs);
 390                 }
 391                 goto cleanup;
 392         }
 393         dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2,
 394                                                     "resize dind buffer");
 395         ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize);
 396
 397         retval = ext2fs_read_ind_block(fs, blk, dind_buf);
 398         if (retval)
 399                 goto resize_inode_invalid;
 400
 401         gdt_off = fs->desc_blocks;
 402         pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks;
 403         if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0)
 404                 pblk++; /* Deal with 1024 blocksize bigalloc fs */
 405         for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4;
 406              i++, gdt_off++, pblk++) {
 407                 gdt_off %= fs->blocksize/4;
 408                 if (dind_buf[gdt_off] != pblk)
 409                         goto resize_inode_invalid;
 410                 retval = ext2fs_read_ind_block(fs, pblk, ind_buf);
 411                 if (retval)
 412                         goto resize_inode_invalid;
 413                 ind_off = 0;
 414                 for (j = 1; j < fs->group_desc_count; j++) {
 415                         if (!ext2fs_bg_has_super(fs, j))
 416                                 continue;
 417                         expect = pblk + (j * fs->super->s_blocks_per_group);
 418                         if (ind_buf[ind_off] != expect)
 419                                 goto resize_inode_invalid;
 420                         ind_off++;
 421                 }
 422         }
 423
 424 cleanup:
 425         if (dind_buf)
 426                 ext2fs_free_mem(&dind_buf);
 427
 428  }
 429
 430 /*
 431  * This function checks the dirhash signed/unsigned hint if necessary.
 432  */
 433 static void e2fsck_fix_dirhash_hint(e2fsck_t ctx)
 434 {
 435         struct ext2_super_block *sb = ctx->fs->super;
 436         struct problem_context pctx;
 437         char    c;
 438
 439         if ((ctx->options & E2F_OPT_READONLY) ||
 440             !(sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) ||
 441             (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH)))
 442                 return;
 443
 444         c = (char) 255;
 445
 446         clear_problem_context(&pctx);
 447         if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) {
 448                 if (((int) c) == -1) {
 449                         sb->s_flags |= EXT2_FLAGS_SIGNED_HASH;
 450                 } else {
 451                         sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
 452                 }
 453                 ext2fs_mark_super_dirty(ctx->fs);
 454         }
 455 }
 456
 457
 458 void check_super_block(e2fsck_t ctx)
 459 {
 460         ext2_filsys fs = ctx->fs;
 461         blk64_t first_block, last_block;
 462         struct ext2_super_block *sb = fs->super;
 463         problem_t       problem;
 464         blk64_t blocks_per_group = fs->super->s_blocks_per_group;
 465         __u32   bpg_max, cpg_max;
 466         int     inodes_per_block;
 467         int     ipg_max;
 468         int     inode_size;
 469         int     accept_time_fudge;
 470         int     broken_system_clock;
 471         dgrp_t  i;
 472         blk64_t should_be;
 473         struct problem_context  pctx;
 474         blk64_t free_blocks = 0;
 475         ino_t   free_inodes = 0;
 476         int     csum_flag, clear_test_fs_flag;
 477
 478         inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
 479         ipg_max = inodes_per_block * (blocks_per_group - 4);
 480         if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
 481                 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
 482         cpg_max = 8 * EXT2_BLOCK_SIZE(sb);
 483         if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb))
 484                 cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb);
 485         bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs);
 486         if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
 487                 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);
 488
 489         ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 490                  sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
 491         ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 492                  sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
 493         ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
 494                 sizeof(int) * fs->group_desc_count, "invalid_inode_table");
 495
 496         clear_problem_context(&pctx);
 497
 498         /*
 499          * Verify the super block constants...
 500          */
 501         check_super_value(ctx, "inodes_count", sb->s_inodes_count,
 502                           MIN_CHECK, 1, 0);
 503         check_super_value(ctx, "blocks_count", ext2fs_blocks_count(sb),
 504                           MIN_CHECK, 1, 0);
 505         check_super_value(ctx, "first_data_block", sb->s_first_data_block,
 506                           MAX_CHECK, 0, ext2fs_blocks_count(sb));
 507         check_super_value(ctx, "log_block_size", sb->s_log_block_size,
 508                           MIN_CHECK | MAX_CHECK, 0,
 509                           EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE);
 510         check_super_value(ctx, "log_cluster_size",
 511                           sb->s_log_cluster_size,
 512                           MIN_CHECK | MAX_CHECK, sb->s_log_block_size,
 513                           (EXT2_MAX_CLUSTER_LOG_SIZE -
 514                            EXT2_MIN_CLUSTER_LOG_SIZE));
 515         check_super_value(ctx, "clusters_per_group", sb->s_clusters_per_group,
 516                           MIN_CHECK | MAX_CHECK, 8, cpg_max);
 517         check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
 518                           MIN_CHECK | MAX_CHECK, 8, bpg_max);
 519         check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
 520                           MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max);
 521         check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb),
 522                           MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2);
 523         check_super_value(ctx, "reserved_gdt_blocks",
 524                           sb->s_reserved_gdt_blocks, MAX_CHECK, 0,
 525                           fs->blocksize/4);
 526         if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
 527                 check_super_value(ctx, "first_ino", sb->s_first_ino,
 528                                   MIN_CHECK | MAX_CHECK,
 529                                   EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count);
 530         inode_size = EXT2_INODE_SIZE(sb);
 531         check_super_value(ctx, "inode_size",
 532                           inode_size, MIN_CHECK | MAX_CHECK,
 533                           EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize);
 534         if (sb->s_blocks_per_group != (sb->s_clusters_per_group *
 535                                        EXT2FS_CLUSTER_RATIO(fs))) {
 536                 pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs);
 537                 pctx.str = "block_size";
 538                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
 539                 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
 540                 return;
 541         }
 542         if (inode_size & (inode_size - 1)) {
 543                 pctx.num = inode_size;
 544                 pctx.str = "inode_size";
 545                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
 546                 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
 547                 return;
 548         }
 549
 550         if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) &&
 551             (ctx->num_blocks < ext2fs_blocks_count(sb))) {
 552                 pctx.blk = ext2fs_blocks_count(sb);
 553                 pctx.blk2 = ctx->num_blocks;
 554                 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
 555                         ctx->flags |= E2F_FLAG_ABORT;
 556                         return;
 557                 }
 558         }
 559
 560         should_be = (sb->s_log_block_size == 0 &&
 561                      EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0;
 562         if (sb->s_first_data_block != should_be) {
 563                 pctx.blk = sb->s_first_data_block;
 564                 pctx.blk2 = should_be;
 565                 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
 566                 ctx->flags |= E2F_FLAG_ABORT;
 567                 return;
 568         }
 569
 570         should_be = sb->s_inodes_per_group * fs->group_desc_count;
 571         if (sb->s_inodes_count != should_be) {
 572                 pctx.ino = sb->s_inodes_count;
 573                 pctx.ino2 = should_be;
 574                 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
 575                         sb->s_inodes_count = should_be;
 576                         ext2fs_mark_super_dirty(fs);
 577                 }
 578         }
 579
 580         /*
 581          * Verify the group descriptors....
 582          */
 583         first_block = sb->s_first_data_block;
 584         last_block = ext2fs_blocks_count(sb)-1;
 585
 586         csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 587                                                EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
 588         for (i = 0; i < fs->group_desc_count; i++) {
 589                 pctx.group = i;
 590
 591                 if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super,
 592                                                EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
 593                         first_block = ext2fs_group_first_block2(fs, i);
 594                         last_block = ext2fs_group_last_block2(fs, i);
 595                 }
 596
 597                 if ((ext2fs_block_bitmap_loc(fs, i) < first_block) ||
 598                     (ext2fs_block_bitmap_loc(fs, i) > last_block)) {
 599                         pctx.blk = ext2fs_block_bitmap_loc(fs, i);
 600                         if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
 601                                 ext2fs_block_bitmap_loc_set(fs, i, 0);
 602                 }
 603                 if (ext2fs_block_bitmap_loc(fs, i) == 0) {
 604                         ctx->invalid_block_bitmap_flag[i]++;
 605                         ctx->invalid_bitmaps++;
 606                 }
 607                 if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) ||
 608                     (ext2fs_inode_bitmap_loc(fs, i) > last_block)) {
 609                         pctx.blk = ext2fs_inode_bitmap_loc(fs, i);
 610                         if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
 611                                 ext2fs_inode_bitmap_loc_set(fs, i, 0);
 612                 }
 613                 if (ext2fs_inode_bitmap_loc(fs, i) == 0) {
 614                         ctx->invalid_inode_bitmap_flag[i]++;
 615                         ctx->invalid_bitmaps++;
 616                 }
 617                 if ((ext2fs_inode_table_loc(fs, i) < first_block) ||
 618                     ((ext2fs_inode_table_loc(fs, i) +
 619                       fs->inode_blocks_per_group - 1) > last_block)) {
 620                         pctx.blk = ext2fs_inode_table_loc(fs, i);
 621                         if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
 622                                 ext2fs_inode_table_loc_set(fs, i, 0);
 623                 }
 624                 if (ext2fs_inode_table_loc(fs, i) == 0) {
 625                         ctx->invalid_inode_table_flag[i]++;
 626                         ctx->invalid_bitmaps++;
 627                 }
 628                 free_blocks += ext2fs_bg_free_blocks_count(fs, i);
 629                 free_inodes += ext2fs_bg_free_inodes_count(fs, i);
 630
 631                 if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) ||
 632                     (ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) ||
 633                     (ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group))
 634                         ext2fs_unmark_valid(fs);
 635
 636                 should_be = 0;
 637                 if (!ext2fs_group_desc_csum_verify(fs, i)) {
 638                         if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) {
 639                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 640                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
 641                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 642                                 should_be = 1;
 643                         }
 644                         ext2fs_unmark_valid(fs);
 645                 }
 646
 647                 if (!csum_flag &&
 648                     (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) ||
 649                      ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) ||
 650                      ext2fs_bg_itable_unused(fs, i) != 0)) {
 651                         if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) {
 652                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 653                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
 654                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 655                                 should_be = 1;
 656                         }
 657                         ext2fs_unmark_valid(fs);
 658                 }
 659
 660                 if (i == fs->group_desc_count - 1 &&
 661                     ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) {
 662                         if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) {
 663                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 664                                 should_be = 1;
 665                         }
 666                         ext2fs_unmark_valid(fs);
 667                 }
 668
 669                 if (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) &&
 670                     !ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT)) {
 671                         if (fix_problem(ctx, PR_0_BB_UNINIT_IB_INIT, &pctx)) {
 672                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 673                                 should_be = 1;
 674                         }
 675                         ext2fs_unmark_valid(fs);
 676                 }
 677
 678                 if (csum_flag &&
 679                     (ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) ||
 680                      ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) {
 681                         pctx.blk = ext2fs_bg_itable_unused(fs, i);
 682                         if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) {
 683                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 684                                 should_be = 1;
 685                         }
 686                         ext2fs_unmark_valid(fs);
 687                 }
 688
 689                 if (should_be)
 690                         ext2fs_group_desc_csum_set(fs, i);
 691                 /* If the user aborts e2fsck by typing ^C, stop right away */
 692                 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 693                         return;
 694         }
 695
 696         ctx->free_blocks = EXT2FS_C2B(fs, free_blocks);
 697         ctx->free_inodes = free_inodes;
 698
 699         if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) ||
 700             (sb->s_free_inodes_count > sb->s_inodes_count))
 701                 ext2fs_unmark_valid(fs);
 702
 703
 704         /*
 705          * If we have invalid bitmaps, set the error state of the
 706          * filesystem.
 707          */
 708         if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
 709                 sb->s_state &= ~EXT2_VALID_FS;
 710                 ext2fs_mark_super_dirty(fs);
 711         }
 712
 713         clear_problem_context(&pctx);
 714
 715 #ifndef EXT2_SKIP_UUID
 716         /*
 717          * If the UUID field isn't assigned, assign it.
 718          */
 719         if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) {
 720                 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
 721                         uuid_generate(sb->s_uuid);
 722                         fs->flags |= EXT2_FLAG_DIRTY;
 723                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 724                 }
 725         }
 726 #endif
 727
 728         /*
 729          * Check to see if we should disable the test_fs flag
 730          */
 731         profile_get_boolean(ctx->profile, "options",
 732                             "clear_test_fs_flag", 0, 1,
 733                             &clear_test_fs_flag);
 734         if (!(ctx->options & E2F_OPT_READONLY) &&
 735             clear_test_fs_flag &&
 736             (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) &&
 737             (fs_proc_check("ext4") || check_for_modules("ext4"))) {
 738                 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) {
 739                         fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS;
 740                         fs->flags |= EXT2_FLAG_DIRTY;
 741                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 742                 }
 743         }
 744
 745         /*
 746          * For the Hurd, check to see if the filetype option is set,
 747          * since it doesn't support it.
 748          */
 749         if (!(ctx->options & E2F_OPT_READONLY) &&
 750             fs->super->s_creator_os == EXT2_OS_HURD &&
 751             (fs->super->s_feature_incompat &
 752              EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 753                 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
 754                         fs->super->s_feature_incompat &=
 755                                 ~EXT2_FEATURE_INCOMPAT_FILETYPE;
 756                         ext2fs_mark_super_dirty(fs);
 757                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 758                 }
 759         }
 760
 761         /*
 762          * If we have any of the compatibility flags set, we need to have a
 763          * revision 1 filesystem.  Most kernels will not check the flags on
 764          * a rev 0 filesystem and we may have corruption issues because of
 765          * the incompatible changes to the filesystem.
 766          */
 767         if (!(ctx->options & E2F_OPT_READONLY) &&
 768             fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
 769             (fs->super->s_feature_compat ||
 770              fs->super->s_feature_ro_compat ||
 771              fs->super->s_feature_incompat) &&
 772             fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
 773                 ext2fs_update_dynamic_rev(fs);
 774                 ext2fs_mark_super_dirty(fs);
 775                 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 776         }
 777
 778         /*
 779          * Clean up any orphan inodes, if present.
 780          */
 781         if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
 782                 fs->super->s_state &= ~EXT2_VALID_FS;
 783                 ext2fs_mark_super_dirty(fs);
 784         }
 785
 786         /*
 787          * Unfortunately, due to Windows' unfortunate design decision
 788          * to configure the hardware clock to tick localtime, instead
 789          * of the more proper and less error-prone UTC time, many
 790          * users end up in the situation where the system clock is
 791          * incorrectly set at the time when e2fsck is run.
 792          *
 793          * Historically this was usually due to some distributions
 794          * having buggy init scripts and/or installers that didn't
 795          * correctly detect this case and take appropriate
 796          * countermeasures.  However, it's still possible, despite the
 797          * best efforts of init script and installer authors to not be
 798          * able to detect this misconfiguration, usually due to a
 799          * buggy or misconfigured virtualization manager or the
 800          * installer not having access to a network time server during
 801          * the installation process.  So by default, we allow the
 802          * superblock times to be fudged by up to 24 hours.  This can
 803          * be disabled by setting options.accept_time_fudge to the
 804          * boolean value of false in e2fsck.conf.  We also support
 805          * options.buggy_init_scripts for backwards compatibility.
 806          */
 807         profile_get_boolean(ctx->profile, "options", "accept_time_fudge",
 808                             0, 1, &accept_time_fudge);
 809         profile_get_boolean(ctx->profile, "options", "buggy_init_scripts",
 810                             0, accept_time_fudge, &accept_time_fudge);
 811         ctx->time_fudge = accept_time_fudge ? 86400 : 0;
 812
 813         profile_get_boolean(ctx->profile, "options", "broken_system_clock",
 814                             0, 0, &broken_system_clock);
 815
 816         /*
 817          * Check to see if the superblock last mount time or last
 818          * write time is in the future.
 819          */
 820         if (!broken_system_clock &&
 821             !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
 822             fs->super->s_mtime > (__u32) ctx->now) {
 823                 pctx.num = fs->super->s_mtime;
 824                 problem = PR_0_FUTURE_SB_LAST_MOUNT;
 825                 if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge)
 826                         problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED;
 827                 if (fix_problem(ctx, problem, &pctx)) {
 828                         fs->super->s_mtime = ctx->now;
 829                         fs->flags |= EXT2_FLAG_DIRTY;
 830                 }
 831         }
 832         if (!broken_system_clock &&
 833             !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
 834             fs->super->s_wtime > (__u32) ctx->now) {
 835                 pctx.num = fs->super->s_wtime;
 836                 problem = PR_0_FUTURE_SB_LAST_WRITE;
 837                 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge)
 838                         problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED;
 839                 if (fix_problem(ctx, problem, &pctx)) {
 840                         fs->super->s_wtime = ctx->now;
 841                         fs->flags |= EXT2_FLAG_DIRTY;
 842                 }
 843         }
 844
 845         /*
 846          * Move the ext3 journal file, if necessary.
 847          */
 848         e2fsck_move_ext3_journal(ctx);
 849
 850         /*
 851          * Fix journal hint, if necessary
 852          */
 853         e2fsck_fix_ext3_journal_hint(ctx);
 854
 855         /*
 856          * Add dirhash hint if necessary
 857          */
 858         e2fsck_fix_dirhash_hint(ctx);
 859
 860         /*
 861          * Hide quota inodes if necessary.
 862          */
 863         e2fsck_hide_quota(ctx);
 864
 865         return;
 866 }
 867
 868 /*
 869  * Check to see if we should backup the master sb to the backup super
 870  * blocks.  Returns non-zero if the sb should be backed up.
 871  */
 872
 873 /*
 874  * A few flags are set on the fly by the kernel, but only in the
 875  * primary superblock.  This is actually a bad thing, and we should
 876  * try to discourage it in the future.  In particular, for the newer
 877  * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and
 878  * EXT3_FEATURE_INCOMPAT_EXTENTS.  So some of these may go away in the
 879  * future.  EXT3_FEATURE_INCOMPAT_RECOVER may also get set when
 880  * copying the primary superblock during online resize.
 881  *
 882  * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but
 883  * unfortunately, we shouldn't ignore it since if it's not set in the
 884  * backup, the extended attributes in the filesystem will be stripped
 885  * away.
 886  */
 887 #define FEATURE_RO_COMPAT_IGNORE        (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 888                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
 889 #define FEATURE_INCOMPAT_IGNORE         (EXT3_FEATURE_INCOMPAT_EXTENTS| \
 890                                          EXT3_FEATURE_INCOMPAT_RECOVER)
 891
 892 int check_backup_super_block(e2fsck_t ctx)
 893 {
 894         ext2_filsys     fs = ctx->fs;
 895         errcode_t       retval;
 896         dgrp_t          g;
 897         blk64_t         sb;
 898         int             ret = 0;
 899         char            buf[SUPERBLOCK_SIZE];
 900         struct ext2_super_block *backup_sb;
 901
 902         /*
 903          * If we are already writing out the backup blocks, then we
 904          * don't need to test.  Also, if the filesystem is invalid, or
 905          * the check was aborted or cancelled, we also don't want to
 906          * do the backup.  If the filesystem was opened read-only then
 907          * we can't do the backup.
 908          */
 909         if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) ||
 910             !ext2fs_test_valid(fs) ||
 911             (fs->super->s_state & EXT2_ERROR_FS) ||
 912             (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) ||
 913             (ctx->options & E2F_OPT_READONLY))
 914                 return 0;
 915
 916         for (g = 1; g < fs->group_desc_count; g++) {
 917                 if (!ext2fs_bg_has_super(fs, g))
 918                         continue;
 919
 920                 sb = fs->super->s_first_data_block +
 921                         (g * fs->super->s_blocks_per_group);
 922
 923                 retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE,
 924                                              buf);
 925                 if (retval)
 926                         continue;
 927                 backup_sb = (struct ext2_super_block *) buf;
 928 #ifdef WORDS_BIGENDIAN
 929                 ext2fs_swap_super(backup_sb);
 930 #endif
 931                 if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) ||
 932                     (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) ||
 933                     ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
 934                      EXT2_MAX_BLOCK_LOG_SIZE) ||
 935                     (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE))
 936                         continue;
 937
 938 #define SUPER_INCOMPAT_DIFFERENT(x)     \
 939         ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) !=   \
 940          (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE))
 941 #define SUPER_RO_COMPAT_DIFFERENT(x)    \
 942         ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) !=  \
 943          (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE))
 944 #define SUPER_DIFFERENT(x)              \
 945         (fs->super->x != backup_sb->x)
 946
 947                 if (SUPER_DIFFERENT(s_feature_compat) ||
 948                     SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
 949                     SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
 950                     SUPER_DIFFERENT(s_blocks_count) ||
 951                     SUPER_DIFFERENT(s_inodes_count) ||
 952                     memcmp(fs->super->s_uuid, backup_sb->s_uuid,
 953                            sizeof(fs->super->s_uuid)))
 954                         ret = 1;
 955                 break;
 956         }
 957         return ret;
 958 }