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                                blk_t    *block_nr,
  58                                e2_blkcnt_t blockcnt,
  59                                blk_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         blk_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 >= fs->super->s_blocks_count)) {
  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_bitmap(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_blk(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_blk(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_blk(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_stats(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                         ((((long long)inode->i_size_high << 32) +
 174                           inode->i_size + 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_iterate2(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 (inode->i_file_acl) {
 201                 retval = ext2fs_adjust_ea_refcount(fs, inode->i_file_acl,
 202                                                    block_buf, -1, &count);
 203                 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
 204                         retval = 0;
 205                         count = 1;
 206                 }
 207                 if (retval) {
 208                         com_err("release_inode_blocks", retval,
 209                 _("while calling ext2fs_adjust_ea_refcount for inode %d"),
 210                                 ino);
 211                         return 1;
 212                 }
 213                 if (count == 0)
 214                         ext2fs_block_alloc_stats(fs, inode->i_file_acl, -1);
 215                 inode->i_file_acl = 0;
 216         }
 217         return 0;
 218 }
 219
 220 /*
 221  * This function releases all of the orphan inodes.  It returns 1 if
 222  * it hit some error, and 0 on success.
 223  */
 224 static int release_orphan_inodes(e2fsck_t ctx)
 225 {
 226         ext2_filsys fs = ctx->fs;
 227         ext2_ino_t      ino, next_ino;
 228         struct ext2_inode inode;
 229         struct problem_context pctx;
 230         char *block_buf;
 231
 232         if ((ino = fs->super->s_last_orphan) == 0)
 233                 return 0;
 234
 235         /*
 236          * Win or lose, we won't be using the head of the orphan inode
 237          * list again.
 238          */
 239         fs->super->s_last_orphan = 0;
 240         ext2fs_mark_super_dirty(fs);
 241
 242         /*
 243          * If the filesystem contains errors, don't run the orphan
 244          * list, since the orphan list can't be trusted; and we're
 245          * going to be running a full e2fsck run anyway...
 246          */
 247         if (fs->super->s_state & EXT2_ERROR_FS)
 248                 return 0;
 249
 250         if ((ino < EXT2_FIRST_INODE(fs->super)) ||
 251             (ino > fs->super->s_inodes_count)) {
 252                 clear_problem_context(&pctx);
 253                 pctx.ino = ino;
 254                 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
 255                 return 1;
 256         }
 257
 258         block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
 259                                                     "block iterate buffer");
 260         e2fsck_read_bitmaps(ctx);
 261
 262         while (ino) {
 263                 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
 264                 clear_problem_context(&pctx);
 265                 pctx.ino = ino;
 266                 pctx.inode = &inode;
 267                 pctx.str = inode.i_links_count ? _("Truncating") :
 268                         _("Clearing");
 269
 270                 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
 271
 272                 next_ino = inode.i_dtime;
 273                 if (next_ino &&
 274                     ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
 275                      (next_ino > fs->super->s_inodes_count))) {
 276                         pctx.ino = next_ino;
 277                         fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
 278                         goto return_abort;
 279                 }
 280
 281                 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
 282                         goto return_abort;
 283
 284                 if (!inode.i_links_count) {
 285                         ext2fs_inode_alloc_stats2(fs, ino, -1,
 286                                                   LINUX_S_ISDIR(inode.i_mode));
 287                         inode.i_dtime = ctx->now;
 288                 } else {
 289                         inode.i_dtime = 0;
 290                 }
 291                 e2fsck_write_inode(ctx, ino, &inode, "delete_file");
 292                 ino = next_ino;
 293         }
 294         ext2fs_free_mem(&block_buf);
 295         return 0;
 296 return_abort:
 297         ext2fs_free_mem(&block_buf);
 298         return 1;
 299 }
 300
 301 /*
 302  * Check the resize inode to make sure it is sane.  We check both for
 303  * the case where on-line resizing is not enabled (in which case the
 304  * resize inode should be cleared) as well as the case where on-line
 305  * resizing is enabled.
 306  */
 307 void check_resize_inode(e2fsck_t ctx)
 308 {
 309         ext2_filsys fs = ctx->fs;
 310         struct ext2_inode inode;
 311         struct problem_context  pctx;
 312         int             i, gdt_off, ind_off;
 313         dgrp_t          j;
 314         blk_t           blk, pblk, expect;
 315         __u32           *dind_buf = 0, *ind_buf;
 316         errcode_t       retval;
 317
 318         clear_problem_context(&pctx);
 319
 320         /*
 321          * If the resize inode feature isn't set, then
 322          * s_reserved_gdt_blocks must be zero.
 323          */
 324         if (!(fs->super->s_feature_compat &
 325               EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
 326                 if (fs->super->s_reserved_gdt_blocks) {
 327                         pctx.num = fs->super->s_reserved_gdt_blocks;
 328                         if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS,
 329                                         &pctx)) {
 330                                 fs->super->s_reserved_gdt_blocks = 0;
 331                                 ext2fs_mark_super_dirty(fs);
 332                         }
 333                 }
 334         }
 335
 336         /* Read the resize inode */
 337         pctx.ino = EXT2_RESIZE_INO;
 338         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
 339         if (retval) {
 340                 if (fs->super->s_feature_compat &
 341                     EXT2_FEATURE_COMPAT_RESIZE_INODE)
 342                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 343                 return;
 344         }
 345
 346         /*
 347          * If the resize inode feature isn't set, check to make sure
 348          * the resize inode is cleared; then we're done.
 349          */
 350         if (!(fs->super->s_feature_compat &
 351               EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
 352                 for (i=0; i < EXT2_N_BLOCKS; i++) {
 353                         if (inode.i_block[i])
 354                                 break;
 355                 }
 356                 if ((i < EXT2_N_BLOCKS) &&
 357                     fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) {
 358                         memset(&inode, 0, sizeof(inode));
 359                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 360                                            "clear_resize");
 361                 }
 362                 return;
 363         }
 364
 365         /*
 366          * The resize inode feature is enabled; check to make sure the
 367          * only block in use is the double indirect block
 368          */
 369         blk = inode.i_block[EXT2_DIND_BLOCK];
 370         for (i=0; i < EXT2_N_BLOCKS; i++) {
 371                 if (i != EXT2_DIND_BLOCK && inode.i_block[i])
 372                         break;
 373         }
 374         if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count ||
 375             !(inode.i_mode & LINUX_S_IFREG) ||
 376             (blk < fs->super->s_first_data_block ||
 377              blk >= fs->super->s_blocks_count)) {
 378         resize_inode_invalid:
 379                 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) {
 380                         memset(&inode, 0, sizeof(inode));
 381                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 382                                            "clear_resize");
 383                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 384                 }
 385                 if (!(ctx->options & E2F_OPT_READONLY)) {
 386                         fs->super->s_state &= ~EXT2_VALID_FS;
 387                         ext2fs_mark_super_dirty(fs);
 388                 }
 389                 goto cleanup;
 390         }
 391         dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2,
 392                                                     "resize dind buffer");
 393         ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize);
 394
 395         retval = ext2fs_read_ind_block(fs, blk, dind_buf);
 396         if (retval)
 397                 goto resize_inode_invalid;
 398
 399         gdt_off = fs->desc_blocks;
 400         pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks;
 401         for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4;
 402              i++, gdt_off++, pblk++) {
 403                 gdt_off %= fs->blocksize/4;
 404                 if (dind_buf[gdt_off] != pblk)
 405                         goto resize_inode_invalid;
 406                 retval = ext2fs_read_ind_block(fs, pblk, ind_buf);
 407                 if (retval)
 408                         goto resize_inode_invalid;
 409                 ind_off = 0;
 410                 for (j = 1; j < fs->group_desc_count; j++) {
 411                         if (!ext2fs_bg_has_super(fs, j))
 412                                 continue;
 413                         expect = pblk + (j * fs->super->s_blocks_per_group);
 414                         if (ind_buf[ind_off] != expect)
 415                                 goto resize_inode_invalid;
 416                         ind_off++;
 417                 }
 418         }
 419
 420 cleanup:
 421         if (dind_buf)
 422                 ext2fs_free_mem(&dind_buf);
 423
 424  }
 425
 426 /*
 427  * This function checks the dirhash signed/unsigned hint if necessary.
 428  */
 429 static void e2fsck_fix_dirhash_hint(e2fsck_t ctx)
 430 {
 431         struct ext2_super_block *sb = ctx->fs->super;
 432         struct problem_context pctx;
 433         char    c;
 434
 435         if ((ctx->options & E2F_OPT_READONLY) ||
 436             !(sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) ||
 437             (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH)))
 438                 return;
 439
 440         c = (char) 255;
 441
 442         clear_problem_context(&pctx);
 443         if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) {
 444                 if (((int) c) == -1) {
 445                         sb->s_flags |= EXT2_FLAGS_SIGNED_HASH;
 446                 } else {
 447                         sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
 448                 }
 449                 ext2fs_mark_super_dirty(ctx->fs);
 450         }
 451 }
 452
 453
 454 void check_super_block(e2fsck_t ctx)
 455 {
 456         ext2_filsys fs = ctx->fs;
 457         blk_t   first_block, last_block;
 458         struct ext2_super_block *sb = fs->super;
 459         struct ext2_group_desc *gd;
 460         problem_t       problem;
 461         blk_t   blocks_per_group = fs->super->s_blocks_per_group;
 462         blk_t   bpg_max;
 463         int     inodes_per_block;
 464         int     ipg_max;
 465         int     inode_size;
 466         int     buggy_init_scripts;
 467         dgrp_t  i;
 468         blk_t   should_be;
 469         struct problem_context  pctx;
 470         blk_t   free_blocks = 0;
 471         ino_t   free_inodes = 0;
 472         int     csum_flag, clear_test_fs_flag;
 473
 474         inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
 475         ipg_max = inodes_per_block * (blocks_per_group - 4);
 476         if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
 477                 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
 478         bpg_max = 8 * EXT2_BLOCK_SIZE(sb);
 479         if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
 480                 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);
 481
 482         ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 483                  sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
 484         ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 485                  sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
 486         ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
 487                 sizeof(int) * fs->group_desc_count, "invalid_inode_table");
 488
 489         clear_problem_context(&pctx);
 490
 491         /*
 492          * Verify the super block constants...
 493          */
 494         check_super_value(ctx, "inodes_count", sb->s_inodes_count,
 495                           MIN_CHECK, 1, 0);
 496         check_super_value(ctx, "blocks_count", sb->s_blocks_count,
 497                           MIN_CHECK, 1, 0);
 498         check_super_value(ctx, "first_data_block", sb->s_first_data_block,
 499                           MAX_CHECK, 0, sb->s_blocks_count);
 500         check_super_value(ctx, "log_block_size", sb->s_log_block_size,
 501                           MIN_CHECK | MAX_CHECK, 0,
 502                           EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE);
 503         check_super_value(ctx, "log_frag_size", sb->s_log_frag_size,
 504                           MIN_CHECK | MAX_CHECK, 0, sb->s_log_block_size);
 505         check_super_value(ctx, "frags_per_group", sb->s_frags_per_group,
 506                           MIN_CHECK | MAX_CHECK, sb->s_blocks_per_group,
 507                           bpg_max);
 508         check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
 509                           MIN_CHECK | MAX_CHECK, 8, bpg_max);
 510         check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
 511                           MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max);
 512         check_super_value(ctx, "r_blocks_count", sb->s_r_blocks_count,
 513                           MAX_CHECK, 0, sb->s_blocks_count / 2);
 514         check_super_value(ctx, "reserved_gdt_blocks",
 515                           sb->s_reserved_gdt_blocks, MAX_CHECK, 0,
 516                           fs->blocksize/4);
 517         if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
 518                 check_super_value(ctx, "first_ino", sb->s_first_ino,
 519                                   MIN_CHECK | MAX_CHECK,
 520                                   EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count);
 521         inode_size = EXT2_INODE_SIZE(sb);
 522         check_super_value(ctx, "inode_size",
 523                           inode_size, MIN_CHECK | MAX_CHECK,
 524                           EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize);
 525         if (inode_size & (inode_size - 1)) {
 526                 pctx.num = inode_size;
 527                 pctx.str = "inode_size";
 528                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
 529                 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
 530                 return;
 531         }
 532
 533         if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) &&
 534             (ctx->num_blocks < sb->s_blocks_count)) {
 535                 pctx.blk = sb->s_blocks_count;
 536                 pctx.blk2 = ctx->num_blocks;
 537                 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
 538                         ctx->flags |= E2F_FLAG_ABORT;
 539                         return;
 540                 }
 541         }
 542
 543         if (sb->s_log_block_size != (__u32) sb->s_log_frag_size) {
 544                 pctx.blk = EXT2_BLOCK_SIZE(sb);
 545                 pctx.blk2 = EXT2_FRAG_SIZE(sb);
 546                 fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx);
 547                 ctx->flags |= E2F_FLAG_ABORT;
 548                 return;
 549         }
 550
 551         should_be = sb->s_frags_per_group >>
 552                 (sb->s_log_block_size - sb->s_log_frag_size);
 553         if (sb->s_blocks_per_group != should_be) {
 554                 pctx.blk = sb->s_blocks_per_group;
 555                 pctx.blk2 = should_be;
 556                 fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx);
 557                 ctx->flags |= E2F_FLAG_ABORT;
 558                 return;
 559         }
 560
 561         should_be = (sb->s_log_block_size == 0) ? 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 = sb->s_blocks_count-1;
 585
 586         csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 587                                                EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
 588         for (i = 0, gd=fs->group_desc; i < fs->group_desc_count; i++, gd++) {
 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_block(fs, i);
 594                         last_block = ext2fs_group_last_block(fs, i);
 595                 }
 596
 597                 if ((gd->bg_block_bitmap < first_block) ||
 598                     (gd->bg_block_bitmap > last_block)) {
 599                         pctx.blk = gd->bg_block_bitmap;
 600                         if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
 601                                 gd->bg_block_bitmap = 0;
 602                 }
 603                 if (gd->bg_block_bitmap == 0) {
 604                         ctx->invalid_block_bitmap_flag[i]++;
 605                         ctx->invalid_bitmaps++;
 606                 }
 607                 if ((gd->bg_inode_bitmap < first_block) ||
 608                     (gd->bg_inode_bitmap > last_block)) {
 609                         pctx.blk = gd->bg_inode_bitmap;
 610                         if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
 611                                 gd->bg_inode_bitmap = 0;
 612                 }
 613                 if (gd->bg_inode_bitmap == 0) {
 614                         ctx->invalid_inode_bitmap_flag[i]++;
 615                         ctx->invalid_bitmaps++;
 616                 }
 617                 if ((gd->bg_inode_table < first_block) ||
 618                     ((gd->bg_inode_table +
 619                       fs->inode_blocks_per_group - 1) > last_block)) {
 620                         pctx.blk = gd->bg_inode_table;
 621                         if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
 622                                 gd->bg_inode_table = 0;
 623                 }
 624                 if (gd->bg_inode_table == 0) {
 625                         ctx->invalid_inode_table_flag[i]++;
 626                         ctx->invalid_bitmaps++;
 627                 }
 628                 free_blocks += gd->bg_free_blocks_count;
 629                 free_inodes += gd->bg_free_inodes_count;
 630
 631                 if ((gd->bg_free_blocks_count > sb->s_blocks_per_group) ||
 632                     (gd->bg_free_inodes_count > sb->s_inodes_per_group) ||
 633                     (gd->bg_used_dirs_count > 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                                 gd->bg_flags &= ~(EXT2_BG_BLOCK_UNINIT |
 640                                                   EXT2_BG_INODE_UNINIT);
 641                                 gd->bg_itable_unused = 0;
 642                                 should_be = 1;
 643                         }
 644                         ext2fs_unmark_valid(fs);
 645                 }
 646
 647                 if (!csum_flag &&
 648                     (gd->bg_flags &(EXT2_BG_BLOCK_UNINIT|EXT2_BG_INODE_UNINIT)||
 649                      gd->bg_itable_unused != 0)){
 650                         if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) {
 651                                 gd->bg_flags &= ~(EXT2_BG_BLOCK_UNINIT |
 652                                                   EXT2_BG_INODE_UNINIT);
 653                                 gd->bg_itable_unused = 0;
 654                                 should_be = 1;
 655                         }
 656                         ext2fs_unmark_valid(fs);
 657                 }
 658
 659                 if (i == fs->group_desc_count - 1 &&
 660                     gd->bg_flags & EXT2_BG_BLOCK_UNINIT) {
 661                         if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) {
 662                                 gd->bg_flags &= ~EXT2_BG_BLOCK_UNINIT;
 663                                 should_be = 1;
 664                         }
 665                         ext2fs_unmark_valid(fs);
 666                 }
 667
 668                 if (gd->bg_flags & EXT2_BG_BLOCK_UNINIT &&
 669                     !(gd->bg_flags & EXT2_BG_INODE_UNINIT)) {
 670                         if (fix_problem(ctx, PR_0_BB_UNINIT_IB_INIT, &pctx)) {
 671                                 gd->bg_flags &= ~EXT2_BG_BLOCK_UNINIT;
 672                                 should_be = 1;
 673                         }
 674                         ext2fs_unmark_valid(fs);
 675                 }
 676
 677                 if (csum_flag &&
 678                     (gd->bg_itable_unused > gd->bg_free_inodes_count ||
 679                      gd->bg_itable_unused > sb->s_inodes_per_group)) {
 680                         pctx.blk = gd->bg_itable_unused;
 681                         if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) {
 682                                 gd->bg_itable_unused = 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         }
 691
 692         /*
 693          * Update the global counts from the block group counts.  This
 694          * is needed for an experimental patch which eliminates
 695          * locking the entire filesystem when allocating blocks or
 696          * inodes; if the filesystem is not unmounted cleanly, the
 697          * global counts may not be accurate.
 698          */
 699         if ((free_blocks != sb->s_free_blocks_count) ||
 700             (free_inodes != sb->s_free_inodes_count)) {
 701                 if (ctx->options & E2F_OPT_READONLY)
 702                         ext2fs_unmark_valid(fs);
 703                 else {
 704                         sb->s_free_blocks_count = free_blocks;
 705                         sb->s_free_inodes_count = free_inodes;
 706                         ext2fs_mark_super_dirty(fs);
 707                 }
 708         }
 709
 710         if ((sb->s_free_blocks_count > sb->s_blocks_count) ||
 711             (sb->s_free_inodes_count > sb->s_inodes_count))
 712                 ext2fs_unmark_valid(fs);
 713
 714
 715         /*
 716          * If we have invalid bitmaps, set the error state of the
 717          * filesystem.
 718          */
 719         if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
 720                 sb->s_state &= ~EXT2_VALID_FS;
 721                 ext2fs_mark_super_dirty(fs);
 722         }
 723
 724         clear_problem_context(&pctx);
 725
 726 #ifndef EXT2_SKIP_UUID
 727         /*
 728          * If the UUID field isn't assigned, assign it.
 729          */
 730         if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) {
 731                 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
 732                         uuid_generate(sb->s_uuid);
 733                         ext2fs_mark_super_dirty(fs);
 734                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 735                 }
 736         }
 737 #endif
 738
 739         /*
 740          * Check to see if we should disable the test_fs flag
 741          */
 742         profile_get_boolean(ctx->profile, "options",
 743                             "clear_test_fs_flag", 0, 1,
 744                             &clear_test_fs_flag);
 745         if (!(ctx->options & E2F_OPT_READONLY) &&
 746             clear_test_fs_flag &&
 747             (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) &&
 748             (fs_proc_check("ext4") || check_for_modules("ext4"))) {
 749                 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) {
 750                         fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS;
 751                         ext2fs_mark_super_dirty(fs);
 752                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 753                 }
 754         }
 755
 756         /*
 757          * For the Hurd, check to see if the filetype option is set,
 758          * since it doesn't support it.
 759          */
 760         if (!(ctx->options & E2F_OPT_READONLY) &&
 761             fs->super->s_creator_os == EXT2_OS_HURD &&
 762             (fs->super->s_feature_incompat &
 763              EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 764                 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
 765                         fs->super->s_feature_incompat &=
 766                                 ~EXT2_FEATURE_INCOMPAT_FILETYPE;
 767                         ext2fs_mark_super_dirty(fs);
 768                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 769                 }
 770         }
 771
 772         /*
 773          * If we have any of the compatibility flags set, we need to have a
 774          * revision 1 filesystem.  Most kernels will not check the flags on
 775          * a rev 0 filesystem and we may have corruption issues because of
 776          * the incompatible changes to the filesystem.
 777          */
 778         if (!(ctx->options & E2F_OPT_READONLY) &&
 779             fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
 780             (fs->super->s_feature_compat ||
 781              fs->super->s_feature_ro_compat ||
 782              fs->super->s_feature_incompat) &&
 783             fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
 784                 ext2fs_update_dynamic_rev(fs);
 785                 ext2fs_mark_super_dirty(fs);
 786                 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 787         }
 788
 789         /*
 790          * Clean up any orphan inodes, if present.
 791          */
 792         if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
 793                 fs->super->s_state &= ~EXT2_VALID_FS;
 794                 ext2fs_mark_super_dirty(fs);
 795         }
 796
 797         /*
 798          * Some buggy distributions (such as Ubuntu) have init scripts
 799          * and/or installers which fail to correctly set the system
 800          * clock before running e2fsck and/or formatting the
 801          * filesystem initially.  Normally this happens because the
 802          * hardware clock is ticking localtime, instead of the more
 803          * proper and less error-prone UTC time.  So while the kernel
 804          * is booting, the system time (which in Linux systems always
 805          * ticks in UTC time) is set from the hardware clock, but
 806          * since the hardware clock is ticking localtime, the system
 807          * time is incorrect.  Unfortunately, some buggy distributions
 808          * do not correct this before running e2fsck.  If this option
 809          * is set to a boolean value of true, we attempt to work
 810          * around this situation by allowing the superblock last write
 811          * time, last mount time, and last check time to be in the
 812          * future by up to 24 hours.
 813          */
 814         profile_get_boolean(ctx->profile, "options", "buggy_init_scripts",
 815                             0, 0, &buggy_init_scripts);
 816         ctx->time_fudge = buggy_init_scripts ? 86400 : 0;
 817
 818         /*
 819          * Check to see if the superblock last mount time or last
 820          * write time is in the future.
 821          */
 822         if (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                         ext2fs_mark_super_dirty(fs);
 830                 }
 831         }
 832         if (fs->super->s_wtime > (__u32) ctx->now) {
 833                 pctx.num = fs->super->s_wtime;
 834                 problem = PR_0_FUTURE_SB_LAST_MOUNT;
 835                 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge)
 836                         problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED;
 837                 if (fix_problem(ctx, problem, &pctx)) {
 838                         fs->super->s_wtime = ctx->now;
 839                         ext2fs_mark_super_dirty(fs);
 840                 }
 841         }
 842
 843         /*
 844          * Move the ext3 journal file, if necessary.
 845          */
 846         e2fsck_move_ext3_journal(ctx);
 847
 848         /*
 849          * Fix journal hint, if necessary
 850          */
 851         e2fsck_fix_ext3_journal_hint(ctx);
 852
 853         /*
 854          * Add dirhash hint if necessary
 855          */
 856         e2fsck_fix_dirhash_hint(ctx);
 857
 858         return;
 859 }
 860
 861 /*
 862  * Check to see if we should backup the master sb to the backup super
 863  * blocks.  Returns non-zero if the sb should be backed up.
 864  */
 865
 866 /*
 867  * A few flags are set on the fly by the kernel, but only in the
 868  * primary superblock.  This is actually a bad thing, and we should
 869  * try to discourage it in the future.  In particular, for the newer
 870  * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and
 871  * EXT3_FEATURE_INCOMPAT_EXTENTS.  So some of these may go away in the
 872  * future.  EXT3_FEATURE_INCOMPAT_RECOVER may also get set when
 873  * copying the primary superblock during online resize.
 874  *
 875  * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but
 876  * unfortunately, we shouldn't ignore it since if it's not set in the
 877  * backup, the extended attributes in the filesystem will be stripped
 878  * away.
 879  */
 880 #define FEATURE_RO_COMPAT_IGNORE        (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 881                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
 882 #define FEATURE_INCOMPAT_IGNORE         (EXT3_FEATURE_INCOMPAT_EXTENTS| \
 883                                          EXT3_FEATURE_INCOMPAT_RECOVER)
 884
 885 int check_backup_super_block(e2fsck_t ctx)
 886 {
 887         ext2_filsys     fs = ctx->fs;
 888         errcode_t       retval;
 889         dgrp_t          g;
 890         blk_t           sb;
 891         int             ret = 0;
 892         char            buf[SUPERBLOCK_SIZE];
 893         struct ext2_super_block *backup_sb;
 894
 895         /*
 896          * If we are already writing out the backup blocks, then we
 897          * don't need to test.  Also, if the filesystem is invalid, or
 898          * the check was aborted or cancelled, we also don't want to
 899          * do the backup.  If the filesystem was opened read-only then
 900          * we can't do the backup.
 901          */
 902         if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) ||
 903             !ext2fs_test_valid(fs) ||
 904             (fs->super->s_state & EXT2_ERROR_FS) ||
 905             (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) ||
 906             (ctx->options & E2F_OPT_READONLY))
 907                 return 0;
 908
 909         for (g = 1; g < fs->group_desc_count; g++) {
 910                 if (!ext2fs_bg_has_super(fs, g))
 911                         continue;
 912
 913                 sb = fs->super->s_first_data_block +
 914                         (g * fs->super->s_blocks_per_group);
 915
 916                 retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE,
 917                                              buf);
 918                 if (retval)
 919                         continue;
 920                 backup_sb = (struct ext2_super_block *) buf;
 921 #ifdef WORDS_BIGENDIAN
 922                 ext2fs_swap_super(backup_sb);
 923 #endif
 924                 if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) ||
 925                     (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) ||
 926                     ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
 927                      EXT2_MAX_BLOCK_LOG_SIZE) ||
 928                     (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE))
 929                         continue;
 930
 931 #define SUPER_INCOMPAT_DIFFERENT(x)     \
 932         ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) !=   \
 933          (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE))
 934 #define SUPER_RO_COMPAT_DIFFERENT(x)    \
 935         ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) !=  \
 936          (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE))
 937 #define SUPER_DIFFERENT(x)              \
 938         (fs->super->x != backup_sb->x)
 939
 940                 if (SUPER_DIFFERENT(s_feature_compat) ||
 941                     SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
 942                     SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
 943                     SUPER_DIFFERENT(s_blocks_count) ||
 944                     SUPER_DIFFERENT(s_inodes_count) ||
 945                     memcmp(fs->super->s_uuid, backup_sb->s_uuid,
 946                            sizeof(fs->super->s_uuid)))
 947                         ret = 1;
 948                 break;
 949         }
 950         return ret;
 951 }