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 #define LOG2_CHECK 4
  26
  27 static void check_super_value(e2fsck_t ctx, const char *descr,
  28                               unsigned long value, int flags,
  29                               unsigned long min_val, unsigned long max_val)
  30 {
  31         struct          problem_context pctx;
  32
  33         if ((flags & MIN_CHECK && value < min_val) ||
  34             (flags & MAX_CHECK && value > max_val) ||
  35             (flags & LOG2_CHECK && (value & (value - 1)) != 0)) {
  36                 clear_problem_context(&pctx);
  37                 pctx.num = value;
  38                 pctx.str = descr;
  39                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
  40                 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
  41         }
  42 }
  43
  44 static void check_super_value64(e2fsck_t ctx, const char *descr,
  45                                 __u64 value, int flags,
  46                                 __u64 min_val, __u64 max_val)
  47 {
  48         struct          problem_context pctx;
  49
  50         if ((flags & MIN_CHECK && value < min_val) ||
  51             (flags & MAX_CHECK && value > max_val) ||
  52             (flags & LOG2_CHECK && (value & (value - 1)) != 0)) {
  53                 clear_problem_context(&pctx);
  54                 pctx.num = value;
  55                 pctx.str = descr;
  56                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
  57                 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
  58         }
  59 }
  60
  61 /*
  62  * helper function to release an inode
  63  */
  64 struct process_block_struct {
  65         e2fsck_t        ctx;
  66         char            *buf;
  67         struct problem_context *pctx;
  68         int             truncating;
  69         int             truncate_offset;
  70         e2_blkcnt_t     truncate_block;
  71         int             truncated_blocks;
  72         int             abort;
  73         errcode_t       errcode;
  74         blk64_t last_cluster;
  75 };
  76
  77 static int release_inode_block(ext2_filsys fs,
  78                                blk64_t  *block_nr,
  79                                e2_blkcnt_t blockcnt,
  80                                blk64_t  ref_blk EXT2FS_ATTR((unused)),
  81                                int      ref_offset EXT2FS_ATTR((unused)),
  82                                void *priv_data)
  83 {
  84         struct process_block_struct *pb;
  85         e2fsck_t                ctx;
  86         struct problem_context  *pctx;
  87         blk64_t                 blk = *block_nr;
  88         blk64_t                 cluster = EXT2FS_B2C(fs, *block_nr);
  89         int                     retval = 0;
  90
  91         pb = (struct process_block_struct *) priv_data;
  92         ctx = pb->ctx;
  93         pctx = pb->pctx;
  94
  95         pctx->blk = blk;
  96         pctx->blkcount = blockcnt;
  97
  98         if (blk == 0)
  99                 return 0;
 100
 101         if (pb->last_cluster == cluster)
 102                 return 0;
 103
 104         pb->last_cluster = cluster;
 105
 106         if ((blk < fs->super->s_first_data_block) ||
 107             (blk >= ext2fs_blocks_count(fs->super))) {
 108                 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
 109         return_abort:
 110                 pb->abort = 1;
 111                 return BLOCK_ABORT;
 112         }
 113
 114         if (!ext2fs_test_block_bitmap2(fs->block_map, blk)) {
 115                 fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx);
 116                 goto return_abort;
 117         }
 118
 119         /*
 120          * If we are deleting an orphan, then we leave the fields alone.
 121          * If we are truncating an orphan, then update the inode fields
 122          * and clean up any partial block data.
 123          */
 124         if (pb->truncating) {
 125                 /*
 126                  * We only remove indirect blocks if they are
 127                  * completely empty.
 128                  */
 129                 if (blockcnt < 0) {
 130                         int     i, limit;
 131                         blk_t   *bp;
 132
 133                         pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
 134                                                         pb->buf);
 135                         if (pb->errcode)
 136                                 goto return_abort;
 137
 138                         limit = fs->blocksize >> 2;
 139                         for (i = 0, bp = (blk_t *) pb->buf;
 140                              i < limit;  i++, bp++)
 141                                 if (*bp)
 142                                         return 0;
 143                 }
 144                 /*
 145                  * We don't remove direct blocks until we've reached
 146                  * the truncation block.
 147                  */
 148                 if (blockcnt >= 0 && blockcnt < pb->truncate_block)
 149                         return 0;
 150                 /*
 151                  * If part of the last block needs truncating, we do
 152                  * it here.
 153                  */
 154                 if ((blockcnt == pb->truncate_block) && pb->truncate_offset) {
 155                         pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
 156                                                         pb->buf);
 157                         if (pb->errcode)
 158                                 goto return_abort;
 159                         memset(pb->buf + pb->truncate_offset, 0,
 160                                fs->blocksize - pb->truncate_offset);
 161                         pb->errcode = io_channel_write_blk64(fs->io, blk, 1,
 162                                                          pb->buf);
 163                         if (pb->errcode)
 164                                 goto return_abort;
 165                 }
 166                 pb->truncated_blocks++;
 167                 *block_nr = 0;
 168                 retval |= BLOCK_CHANGED;
 169         }
 170
 171         ext2fs_block_alloc_stats2(fs, blk, -1);
 172         ctx->free_blocks++;
 173         return retval;
 174 }
 175
 176 /*
 177  * This function releases an inode.  Returns 1 if an inconsistency was
 178  * found.  If the inode has a link count, then it is being truncated and
 179  * not deleted.
 180  */
 181 static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
 182                                 struct ext2_inode *inode, char *block_buf,
 183                                 struct problem_context *pctx)
 184 {
 185         struct process_block_struct     pb;
 186         ext2_filsys                     fs = ctx->fs;
 187         errcode_t                       retval;
 188         __u32                           count;
 189
 190         if (!ext2fs_inode_has_valid_blocks2(fs, inode))
 191                 return 0;
 192
 193         pb.buf = block_buf + 3 * ctx->fs->blocksize;
 194         pb.ctx = ctx;
 195         pb.abort = 0;
 196         pb.errcode = 0;
 197         pb.pctx = pctx;
 198         pb.last_cluster = 0;
 199         if (inode->i_links_count) {
 200                 pb.truncating = 1;
 201                 pb.truncate_block = (e2_blkcnt_t)
 202                         ((EXT2_I_SIZE(inode) + fs->blocksize - 1) /
 203                          fs->blocksize);
 204                 pb.truncate_offset = inode->i_size % fs->blocksize;
 205         } else {
 206                 pb.truncating = 0;
 207                 pb.truncate_block = 0;
 208                 pb.truncate_offset = 0;
 209         }
 210         pb.truncated_blocks = 0;
 211         retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE,
 212                                       block_buf, release_inode_block, &pb);
 213         if (retval) {
 214                 com_err("release_inode_blocks", retval,
 215                         _("while calling ext2fs_block_iterate for inode %u"),
 216                         ino);
 217                 return 1;
 218         }
 219         if (pb.abort)
 220                 return 1;
 221
 222         /* Refresh the inode since ext2fs_block_iterate may have changed it */
 223         e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks");
 224
 225         if (pb.truncated_blocks)
 226                 ext2fs_iblk_sub_blocks(fs, inode, pb.truncated_blocks);
 227
 228         if (ext2fs_file_acl_block(fs, inode)) {
 229                 retval = ext2fs_adjust_ea_refcount3(fs,
 230                                 ext2fs_file_acl_block(fs, inode),
 231                                 block_buf, -1, &count, ino);
 232                 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
 233                         retval = 0;
 234                         count = 1;
 235                 }
 236                 if (retval) {
 237                         com_err("release_inode_blocks", retval,
 238                 _("while calling ext2fs_adjust_ea_refcount2 for inode %u"),
 239                                 ino);
 240                         return 1;
 241                 }
 242                 if (count == 0) {
 243                         ext2fs_block_alloc_stats2(fs,
 244                                         ext2fs_file_acl_block(fs, inode), -1);
 245                         ctx->free_blocks++;
 246                 }
 247                 ext2fs_file_acl_block_set(fs, inode, 0);
 248         }
 249         return 0;
 250 }
 251
 252 /*
 253  * This function releases all of the orphan inodes.  It returns 1 if
 254  * it hit some error, and 0 on success.
 255  */
 256 static int release_orphan_inodes(e2fsck_t ctx)
 257 {
 258         ext2_filsys fs = ctx->fs;
 259         ext2_ino_t      ino, next_ino;
 260         struct ext2_inode inode;
 261         struct problem_context pctx;
 262         char *block_buf;
 263
 264         if ((ino = fs->super->s_last_orphan) == 0)
 265                 return 0;
 266
 267         /*
 268          * Win or lose, we won't be using the head of the orphan inode
 269          * list again.
 270          */
 271         fs->super->s_last_orphan = 0;
 272         ext2fs_mark_super_dirty(fs);
 273
 274         /*
 275          * If the filesystem contains errors, don't run the orphan
 276          * list, since the orphan list can't be trusted; and we're
 277          * going to be running a full e2fsck run anyway...
 278          */
 279         if (fs->super->s_state & EXT2_ERROR_FS)
 280                 return 0;
 281
 282         if ((ino < EXT2_FIRST_INODE(fs->super)) ||
 283             (ino > fs->super->s_inodes_count)) {
 284                 clear_problem_context(&pctx);
 285                 pctx.ino = ino;
 286                 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
 287                 return 1;
 288         }
 289
 290         block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
 291                                                     "block iterate buffer");
 292         e2fsck_read_bitmaps(ctx);
 293
 294         while (ino) {
 295                 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
 296                 clear_problem_context(&pctx);
 297                 pctx.ino = ino;
 298                 pctx.inode = &inode;
 299                 pctx.str = inode.i_links_count ? _("Truncating") :
 300                         _("Clearing");
 301
 302                 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
 303
 304                 next_ino = inode.i_dtime;
 305                 if (next_ino &&
 306                     ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
 307                      (next_ino > fs->super->s_inodes_count))) {
 308                         pctx.ino = next_ino;
 309                         fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
 310                         goto return_abort;
 311                 }
 312
 313                 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
 314                         goto return_abort;
 315
 316                 if (!inode.i_links_count) {
 317                         ext2fs_inode_alloc_stats2(fs, ino, -1,
 318                                                   LINUX_S_ISDIR(inode.i_mode));
 319                         ctx->free_inodes++;
 320                         inode.i_dtime = ctx->now;
 321                 } else {
 322                         inode.i_dtime = 0;
 323                 }
 324                 e2fsck_write_inode(ctx, ino, &inode, "delete_file");
 325                 ino = next_ino;
 326         }
 327         ext2fs_free_mem(&block_buf);
 328         return 0;
 329 return_abort:
 330         ext2fs_free_mem(&block_buf);
 331         return 1;
 332 }
 333
 334 /*
 335  * Check the resize inode to make sure it is sane.  We check both for
 336  * the case where on-line resizing is not enabled (in which case the
 337  * resize inode should be cleared) as well as the case where on-line
 338  * resizing is enabled.
 339  */
 340 void check_resize_inode(e2fsck_t ctx)
 341 {
 342         ext2_filsys fs = ctx->fs;
 343         struct ext2_inode inode;
 344         struct problem_context  pctx;
 345         int             i, gdt_off, ind_off;
 346         dgrp_t          j;
 347         blk_t           blk, pblk;
 348         blk_t           expect; /* for resize inode, which is 32-bit only */
 349         __u32           *dind_buf = 0, *ind_buf;
 350         errcode_t       retval;
 351
 352         clear_problem_context(&pctx);
 353
 354         /*
 355          * If the resize inode feature isn't set, then
 356          * s_reserved_gdt_blocks must be zero.
 357          */
 358         if (!ext2fs_has_feature_resize_inode(fs->super)) {
 359                 if (fs->super->s_reserved_gdt_blocks) {
 360                         pctx.num = fs->super->s_reserved_gdt_blocks;
 361                         if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS,
 362                                         &pctx)) {
 363                                 fs->super->s_reserved_gdt_blocks = 0;
 364                                 ext2fs_mark_super_dirty(fs);
 365                         }
 366                 }
 367         }
 368
 369         /* Read the resize inode */
 370         pctx.ino = EXT2_RESIZE_INO;
 371         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
 372         if (retval) {
 373                 if (ext2fs_has_feature_resize_inode(fs->super))
 374                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 375                 return;
 376         }
 377
 378         /*
 379          * If the resize inode feature isn't set, check to make sure
 380          * the resize inode is cleared; then we're done.
 381          */
 382         if (!ext2fs_has_feature_resize_inode(fs->super)) {
 383                 for (i=0; i < EXT2_N_BLOCKS; i++) {
 384                         if (inode.i_block[i])
 385                                 break;
 386                 }
 387                 if ((i < EXT2_N_BLOCKS) &&
 388                     fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) {
 389                         memset(&inode, 0, sizeof(inode));
 390                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 391                                            "clear_resize");
 392                 }
 393                 return;
 394         }
 395
 396         /*
 397          * The resize inode feature is enabled; check to make sure the
 398          * only block in use is the double indirect block
 399          */
 400         blk = inode.i_block[EXT2_DIND_BLOCK];
 401         for (i=0; i < EXT2_N_BLOCKS; i++) {
 402                 if (i != EXT2_DIND_BLOCK && inode.i_block[i])
 403                         break;
 404         }
 405         if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count ||
 406             !(inode.i_mode & LINUX_S_IFREG) ||
 407             (blk < fs->super->s_first_data_block ||
 408              blk >= ext2fs_blocks_count(fs->super))) {
 409         resize_inode_invalid:
 410                 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) {
 411                         memset(&inode, 0, sizeof(inode));
 412                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 413                                            "clear_resize");
 414                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 415                 }
 416                 if (!(ctx->options & E2F_OPT_READONLY)) {
 417                         fs->super->s_state &= ~EXT2_VALID_FS;
 418                         ext2fs_mark_super_dirty(fs);
 419                 }
 420                 goto cleanup;
 421         }
 422         dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2,
 423                                                     "resize dind buffer");
 424         ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize);
 425
 426         retval = ext2fs_read_ind_block(fs, blk, dind_buf);
 427         if (retval)
 428                 goto resize_inode_invalid;
 429
 430         gdt_off = fs->desc_blocks;
 431         pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks;
 432         if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0)
 433                 pblk++; /* Deal with 1024 blocksize bigalloc fs */
 434         for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4;
 435              i++, gdt_off++, pblk++) {
 436                 gdt_off %= fs->blocksize/4;
 437                 if (dind_buf[gdt_off] != pblk)
 438                         goto resize_inode_invalid;
 439                 retval = ext2fs_read_ind_block(fs, pblk, ind_buf);
 440                 if (retval)
 441                         goto resize_inode_invalid;
 442                 ind_off = 0;
 443                 for (j = 1; j < fs->group_desc_count; j++) {
 444                         if (!ext2fs_bg_has_super(fs, j))
 445                                 continue;
 446                         expect = pblk + EXT2_GROUPS_TO_BLOCKS(fs->super, j);
 447                         if (ind_buf[ind_off] != expect)
 448                                 goto resize_inode_invalid;
 449                         ind_off++;
 450                 }
 451         }
 452
 453 cleanup:
 454         if (dind_buf)
 455                 ext2fs_free_mem(&dind_buf);
 456
 457  }
 458
 459 /*
 460  * This function checks the dirhash signed/unsigned hint if necessary.
 461  */
 462 static void e2fsck_fix_dirhash_hint(e2fsck_t ctx)
 463 {
 464         struct ext2_super_block *sb = ctx->fs->super;
 465         struct problem_context pctx;
 466         char    c;
 467
 468         if ((ctx->options & E2F_OPT_READONLY) ||
 469             !ext2fs_has_feature_dir_index(sb) ||
 470             (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH)))
 471                 return;
 472
 473         c = (char) 255;
 474
 475         clear_problem_context(&pctx);
 476         if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) {
 477                 if (((int) c) == -1) {
 478                         sb->s_flags |= EXT2_FLAGS_SIGNED_HASH;
 479                 } else {
 480                         sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
 481                 }
 482                 ext2fs_mark_super_dirty(ctx->fs);
 483         }
 484 }
 485
 486
 487 void check_super_block(e2fsck_t ctx)
 488 {
 489         ext2_filsys fs = ctx->fs;
 490         blk64_t first_block, last_block;
 491         struct ext2_super_block *sb = fs->super;
 492         unsigned int    ipg_max;
 493         problem_t       problem;
 494         blk64_t blocks_per_group = fs->super->s_blocks_per_group;
 495         __u32   bpg_max, cpg_max;
 496         __u64   blks_max;
 497         int     inodes_per_block;
 498         int     inode_size;
 499         int     accept_time_fudge;
 500         int     broken_system_clock;
 501         dgrp_t  i;
 502         blk64_t should_be;
 503         struct problem_context  pctx;
 504         blk64_t free_blocks = 0;
 505         ino_t   free_inodes = 0;
 506         int     csum_flag, clear_test_fs_flag;
 507
 508         inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
 509         ipg_max = inodes_per_block * (blocks_per_group - 4);
 510         if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
 511                 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
 512         cpg_max = 8 * EXT2_BLOCK_SIZE(sb);
 513         if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb))
 514                 cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb);
 515         bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs);
 516         if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
 517                 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);
 518
 519         ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 520                  sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
 521         ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 522                  sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
 523         ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
 524                 sizeof(int) * fs->group_desc_count, "invalid_inode_table");
 525
 526         blks_max = (1ULL << 32) * EXT2_MAX_BLOCKS_PER_GROUP(fs->super);
 527         if (ext2fs_has_feature_64bit(fs->super)) {
 528                 if (blks_max > ((1ULL << 48) - 1))
 529                         blks_max = (1ULL << 48) - 1;
 530         } else {
 531                 if (blks_max > ((1ULL << 32) - 1))
 532                         blks_max = (1ULL << 32) - 1;
 533         }
 534
 535         clear_problem_context(&pctx);
 536
 537         /*
 538          * Verify the super block constants...
 539          */
 540         check_super_value(ctx, "inodes_count", sb->s_inodes_count,
 541                           MIN_CHECK, 1, 0);
 542         check_super_value64(ctx, "blocks_count", ext2fs_blocks_count(sb),
 543                             MIN_CHECK | MAX_CHECK, 1, blks_max);
 544         check_super_value(ctx, "first_data_block", sb->s_first_data_block,
 545                           MAX_CHECK, 0, ext2fs_blocks_count(sb));
 546         check_super_value(ctx, "log_block_size", sb->s_log_block_size,
 547                           MIN_CHECK | MAX_CHECK, 0,
 548                           EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE);
 549         check_super_value(ctx, "log_cluster_size",
 550                           sb->s_log_cluster_size,
 551                           MIN_CHECK | MAX_CHECK, sb->s_log_block_size,
 552                           (EXT2_MAX_CLUSTER_LOG_SIZE -
 553                            EXT2_MIN_CLUSTER_LOG_SIZE));
 554         check_super_value(ctx, "clusters_per_group", sb->s_clusters_per_group,
 555                           MIN_CHECK | MAX_CHECK, 8, cpg_max);
 556         check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
 557                           MIN_CHECK | MAX_CHECK, 8, bpg_max);
 558         check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
 559                           MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max);
 560         check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb),
 561                           MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2);
 562         check_super_value(ctx, "reserved_gdt_blocks",
 563                           sb->s_reserved_gdt_blocks, MAX_CHECK, 0,
 564                           fs->blocksize / sizeof(__u32));
 565         check_super_value(ctx, "desc_size",
 566                           sb->s_desc_size, MAX_CHECK | LOG2_CHECK, 0,
 567                           EXT2_MAX_DESC_SIZE);
 568         if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
 569                 check_super_value(ctx, "first_ino", sb->s_first_ino,
 570                                   MIN_CHECK | MAX_CHECK,
 571                                   EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count);
 572         inode_size = EXT2_INODE_SIZE(sb);
 573         check_super_value(ctx, "inode_size",
 574                           inode_size, MIN_CHECK | MAX_CHECK | LOG2_CHECK,
 575                           EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize);
 576         if (sb->s_blocks_per_group != (sb->s_clusters_per_group *
 577                                        EXT2FS_CLUSTER_RATIO(fs))) {
 578                 pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs);
 579                 pctx.str = "block_size";
 580                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
 581                 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
 582                 return;
 583         }
 584
 585         if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) &&
 586             (ctx->num_blocks < ext2fs_blocks_count(sb))) {
 587                 pctx.blk = ext2fs_blocks_count(sb);
 588                 pctx.blk2 = ctx->num_blocks;
 589                 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
 590                         ctx->flags |= E2F_FLAG_ABORT;
 591                         return;
 592                 }
 593         }
 594
 595         should_be = (sb->s_log_block_size == 0 &&
 596                      EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0;
 597         if (sb->s_first_data_block != should_be) {
 598                 pctx.blk = sb->s_first_data_block;
 599                 pctx.blk2 = should_be;
 600                 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
 601                 ctx->flags |= E2F_FLAG_ABORT;
 602                 return;
 603         }
 604
 605         should_be = (blk64_t)sb->s_inodes_per_group * fs->group_desc_count;
 606         if (should_be > UINT_MAX)
 607                 should_be = UINT_MAX;
 608         if (sb->s_inodes_count != should_be) {
 609                 pctx.ino = sb->s_inodes_count;
 610                 pctx.ino2 = should_be;
 611                 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
 612                         sb->s_inodes_count = should_be;
 613                         ext2fs_mark_super_dirty(fs);
 614                 }
 615         }
 616         if (EXT2_INODE_SIZE(sb) > EXT2_GOOD_OLD_INODE_SIZE) {
 617                 unsigned min =
 618                         sizeof(((struct ext2_inode_large *) 0)->i_extra_isize) +
 619                         sizeof(((struct ext2_inode_large *) 0)->i_checksum_hi);
 620                 unsigned max = EXT2_INODE_SIZE(sb) - EXT2_GOOD_OLD_INODE_SIZE;
 621                 pctx.num = sb->s_min_extra_isize;
 622                 if (sb->s_min_extra_isize &&
 623                     (sb->s_min_extra_isize < min ||
 624                      sb->s_min_extra_isize > max ||
 625                      sb->s_min_extra_isize & 3) &&
 626                     fix_problem(ctx, PR_0_BAD_MIN_EXTRA_ISIZE, &pctx)) {
 627                         sb->s_min_extra_isize =
 628                                 (sizeof(struct ext2_inode_large) -
 629                                  EXT2_GOOD_OLD_INODE_SIZE);
 630                         ext2fs_mark_super_dirty(fs);
 631                 }
 632                 pctx.num = sb->s_want_extra_isize;
 633                 if (sb->s_want_extra_isize &&
 634                     (sb->s_want_extra_isize < min ||
 635                      sb->s_want_extra_isize > max ||
 636                      sb->s_want_extra_isize & 3) &&
 637                     fix_problem(ctx, PR_0_BAD_WANT_EXTRA_ISIZE, &pctx)) {
 638                         sb->s_want_extra_isize =
 639                                 (sizeof(struct ext2_inode_large) -
 640                                  EXT2_GOOD_OLD_INODE_SIZE);
 641                         ext2fs_mark_super_dirty(fs);
 642                 }
 643         }
 644
 645         /* Are metadata_csum and uninit_bg both set? */
 646         if (ext2fs_has_feature_metadata_csum(fs->super) &&
 647             ext2fs_has_feature_gdt_csum(fs->super) &&
 648             fix_problem(ctx, PR_0_META_AND_GDT_CSUM_SET, &pctx)) {
 649                 ext2fs_clear_feature_gdt_csum(fs->super);
 650                 ext2fs_mark_super_dirty(fs);
 651                 for (i = 0; i < fs->group_desc_count; i++)
 652                         ext2fs_group_desc_csum_set(fs, i);
 653         }
 654
 655         /* We can't have ^metadata_csum,metadata_csum_seed */
 656         if (!ext2fs_has_feature_metadata_csum(fs->super) &&
 657             ext2fs_has_feature_csum_seed(fs->super) &&
 658             fix_problem(ctx, PR_0_CSUM_SEED_WITHOUT_META_CSUM, &pctx)) {
 659                 ext2fs_clear_feature_csum_seed(fs->super);
 660                 fs->super->s_checksum_seed = 0;
 661                 ext2fs_mark_super_dirty(fs);
 662         }
 663
 664         /* Is 64bit set and extents unset? */
 665         if (ext2fs_has_feature_64bit(fs->super) &&
 666             !ext2fs_has_feature_extents(fs->super) &&
 667             fix_problem(ctx, PR_0_64BIT_WITHOUT_EXTENTS, &pctx)) {
 668                 ext2fs_set_feature_extents(fs->super);
 669                 ext2fs_mark_super_dirty(fs);
 670         }
 671
 672         /* Did user ask us to convert files to extents? */
 673         if (ctx->options & E2F_OPT_CONVERT_BMAP) {
 674                 ext2fs_set_feature_extents(fs->super);
 675                 ext2fs_mark_super_dirty(fs);
 676         }
 677
 678         if (ext2fs_has_feature_meta_bg(fs->super) &&
 679             (fs->super->s_first_meta_bg > fs->desc_blocks)) {
 680                 pctx.group = fs->desc_blocks;
 681                 pctx.num = fs->super->s_first_meta_bg;
 682                 if (fix_problem(ctx, PR_0_FIRST_META_BG_TOO_BIG, &pctx)) {
 683                         ext2fs_clear_feature_meta_bg(fs->super);
 684                         fs->super->s_first_meta_bg = 0;
 685                         ext2fs_mark_super_dirty(fs);
 686                 }
 687         }
 688
 689         /*
 690          * Verify the group descriptors....
 691          */
 692         first_block = sb->s_first_data_block;
 693         last_block = ext2fs_blocks_count(sb)-1;
 694
 695         csum_flag = ext2fs_has_group_desc_csum(fs);
 696         for (i = 0; i < fs->group_desc_count; i++) {
 697                 pctx.group = i;
 698
 699                 if (!ext2fs_has_feature_flex_bg(fs->super)) {
 700                         first_block = ext2fs_group_first_block2(fs, i);
 701                         last_block = ext2fs_group_last_block2(fs, i);
 702                 }
 703
 704                 if ((ext2fs_block_bitmap_loc(fs, i) < first_block) ||
 705                     (ext2fs_block_bitmap_loc(fs, i) > last_block)) {
 706                         pctx.blk = ext2fs_block_bitmap_loc(fs, i);
 707                         if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
 708                                 ext2fs_block_bitmap_loc_set(fs, i, 0);
 709                 }
 710                 if (ext2fs_block_bitmap_loc(fs, i) == 0) {
 711                         ctx->invalid_block_bitmap_flag[i]++;
 712                         ctx->invalid_bitmaps++;
 713                 }
 714                 if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) ||
 715                     (ext2fs_inode_bitmap_loc(fs, i) > last_block)) {
 716                         pctx.blk = ext2fs_inode_bitmap_loc(fs, i);
 717                         if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
 718                                 ext2fs_inode_bitmap_loc_set(fs, i, 0);
 719                 }
 720                 if (ext2fs_inode_bitmap_loc(fs, i) == 0) {
 721                         ctx->invalid_inode_bitmap_flag[i]++;
 722                         ctx->invalid_bitmaps++;
 723                 }
 724                 if ((ext2fs_inode_table_loc(fs, i) < first_block) ||
 725                     ((ext2fs_inode_table_loc(fs, i) +
 726                       fs->inode_blocks_per_group - 1) > last_block)) {
 727                         pctx.blk = ext2fs_inode_table_loc(fs, i);
 728                         if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
 729                                 ext2fs_inode_table_loc_set(fs, i, 0);
 730                 }
 731                 if (ext2fs_inode_table_loc(fs, i) == 0) {
 732                         ctx->invalid_inode_table_flag[i]++;
 733                         ctx->invalid_bitmaps++;
 734                 }
 735                 free_blocks += ext2fs_bg_free_blocks_count(fs, i);
 736                 free_inodes += ext2fs_bg_free_inodes_count(fs, i);
 737
 738                 if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) ||
 739                     (ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) ||
 740                     (ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group))
 741                         ext2fs_unmark_valid(fs);
 742
 743                 should_be = 0;
 744                 if (!ext2fs_group_desc_csum_verify(fs, i)) {
 745                         pctx.csum1 = ext2fs_bg_checksum(fs, i);
 746                         pctx.csum2 = ext2fs_group_desc_csum(fs, i);
 747                         if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) {
 748                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 749                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
 750                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 751                                 should_be = 1;
 752                         }
 753                         ext2fs_unmark_valid(fs);
 754                 }
 755
 756                 if (!csum_flag &&
 757                     (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) ||
 758                      ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) ||
 759                      ext2fs_bg_itable_unused(fs, i) != 0)) {
 760                         if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) {
 761                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 762                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
 763                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 764                                 should_be = 1;
 765                         }
 766                         ext2fs_unmark_valid(fs);
 767                 }
 768
 769                 if (i == fs->group_desc_count - 1 &&
 770                     ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) {
 771                         if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) {
 772                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 773                                 should_be = 1;
 774                         }
 775                         ext2fs_unmark_valid(fs);
 776                 }
 777
 778                 if (csum_flag &&
 779                     (ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) ||
 780                      ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) {
 781                         pctx.blk = ext2fs_bg_itable_unused(fs, i);
 782                         if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) {
 783                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 784                                 should_be = 1;
 785                         }
 786                         ext2fs_unmark_valid(fs);
 787                 }
 788
 789                 if (should_be)
 790                         ext2fs_group_desc_csum_set(fs, i);
 791                 /* If the user aborts e2fsck by typing ^C, stop right away */
 792                 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 793                         return;
 794         }
 795
 796         ctx->free_blocks = EXT2FS_C2B(fs, free_blocks);
 797         ctx->free_inodes = free_inodes;
 798
 799         if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) ||
 800             (sb->s_free_inodes_count > sb->s_inodes_count))
 801                 ext2fs_unmark_valid(fs);
 802
 803
 804         /*
 805          * If we have invalid bitmaps, set the error state of the
 806          * filesystem.
 807          */
 808         if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
 809                 sb->s_state &= ~EXT2_VALID_FS;
 810                 ext2fs_mark_super_dirty(fs);
 811         }
 812
 813         clear_problem_context(&pctx);
 814
 815 #ifndef EXT2_SKIP_UUID
 816         /*
 817          * If the UUID field isn't assigned, assign it.
 818          * Skip if checksums are enabled and the filesystem is mounted,
 819          * if the id changes under the kernel remounting rw may fail.
 820          */
 821         if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid) &&
 822             !ext2fs_has_feature_metadata_csum(ctx->fs->super) &&
 823             (!csum_flag || !(ctx->mount_flags & EXT2_MF_MOUNTED))) {
 824                 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
 825                         uuid_generate(sb->s_uuid);
 826                         ext2fs_init_csum_seed(fs);
 827                         fs->flags |= EXT2_FLAG_DIRTY;
 828                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 829                 }
 830         }
 831 #endif
 832
 833         /*
 834          * Check to see if we should disable the test_fs flag
 835          */
 836         profile_get_boolean(ctx->profile, "options",
 837                             "clear_test_fs_flag", 0, 1,
 838                             &clear_test_fs_flag);
 839         if (!(ctx->options & E2F_OPT_READONLY) &&
 840             clear_test_fs_flag &&
 841             (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) &&
 842             (fs_proc_check("ext4") || check_for_modules("ext4"))) {
 843                 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) {
 844                         fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS;
 845                         fs->flags |= EXT2_FLAG_DIRTY;
 846                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 847                 }
 848         }
 849
 850         /*
 851          * For the Hurd, check to see if the filetype option is set,
 852          * since it doesn't support it.
 853          */
 854         if (!(ctx->options & E2F_OPT_READONLY) &&
 855             fs->super->s_creator_os == EXT2_OS_HURD &&
 856             ext2fs_has_feature_filetype(fs->super)) {
 857                 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
 858                         ext2fs_clear_feature_filetype(fs->super);
 859                         ext2fs_mark_super_dirty(fs);
 860                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 861                 }
 862         }
 863
 864         /*
 865          * If we have any of the compatibility flags set, we need to have a
 866          * revision 1 filesystem.  Most kernels will not check the flags on
 867          * a rev 0 filesystem and we may have corruption issues because of
 868          * the incompatible changes to the filesystem.
 869          */
 870         if (!(ctx->options & E2F_OPT_READONLY) &&
 871             fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
 872             (fs->super->s_feature_compat ||
 873              fs->super->s_feature_ro_compat ||
 874              fs->super->s_feature_incompat) &&
 875             fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
 876                 ext2fs_update_dynamic_rev(fs);
 877                 ext2fs_mark_super_dirty(fs);
 878                 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 879         }
 880
 881         /*
 882          * Clean up any orphan inodes, if present.
 883          */
 884         if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
 885                 fs->super->s_state &= ~EXT2_VALID_FS;
 886                 ext2fs_mark_super_dirty(fs);
 887         }
 888
 889         /*
 890          * Unfortunately, due to Windows' unfortunate design decision
 891          * to configure the hardware clock to tick localtime, instead
 892          * of the more proper and less error-prone UTC time, many
 893          * users end up in the situation where the system clock is
 894          * incorrectly set at the time when e2fsck is run.
 895          *
 896          * Historically this was usually due to some distributions
 897          * having buggy init scripts and/or installers that didn't
 898          * correctly detect this case and take appropriate
 899          * countermeasures.  However, it's still possible, despite the
 900          * best efforts of init script and installer authors to not be
 901          * able to detect this misconfiguration, usually due to a
 902          * buggy or misconfigured virtualization manager or the
 903          * installer not having access to a network time server during
 904          * the installation process.  So by default, we allow the
 905          * superblock times to be fudged by up to 24 hours.  This can
 906          * be disabled by setting options.accept_time_fudge to the
 907          * boolean value of false in e2fsck.conf.  We also support
 908          * options.buggy_init_scripts for backwards compatibility.
 909          */
 910         profile_get_boolean(ctx->profile, "options", "accept_time_fudge",
 911                             0, 1, &accept_time_fudge);
 912         profile_get_boolean(ctx->profile, "options", "buggy_init_scripts",
 913                             0, accept_time_fudge, &accept_time_fudge);
 914         ctx->time_fudge = accept_time_fudge ? 86400 : 0;
 915
 916         profile_get_boolean(ctx->profile, "options", "broken_system_clock",
 917                             0, 0, &broken_system_clock);
 918
 919         /*
 920          * Check to see if the superblock last mount time or last
 921          * write time is in the future.
 922          */
 923         if (!broken_system_clock &&
 924             !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
 925             fs->super->s_mtime > (__u32) ctx->now) {
 926                 pctx.num = fs->super->s_mtime;
 927                 problem = PR_0_FUTURE_SB_LAST_MOUNT;
 928                 if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge)
 929                         problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED;
 930                 if (fix_problem(ctx, problem, &pctx)) {
 931                         fs->super->s_mtime = ctx->now;
 932                         fs->flags |= EXT2_FLAG_DIRTY;
 933                 }
 934         }
 935         if (!broken_system_clock &&
 936             !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
 937             fs->super->s_wtime > (__u32) ctx->now) {
 938                 pctx.num = fs->super->s_wtime;
 939                 problem = PR_0_FUTURE_SB_LAST_WRITE;
 940                 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge)
 941                         problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED;
 942                 if (fix_problem(ctx, problem, &pctx)) {
 943                         fs->super->s_wtime = ctx->now;
 944                         fs->flags |= EXT2_FLAG_DIRTY;
 945                 }
 946         }
 947
 948         e2fsck_validate_quota_inodes(ctx);
 949
 950         /*
 951          * Move the ext3 journal file, if necessary.
 952          */
 953         e2fsck_move_ext3_journal(ctx);
 954
 955         /*
 956          * Fix journal hint, if necessary
 957          */
 958         e2fsck_fix_ext3_journal_hint(ctx);
 959
 960         /*
 961          * Add dirhash hint if necessary
 962          */
 963         e2fsck_fix_dirhash_hint(ctx);
 964
 965         /*
 966          * Hide quota inodes if necessary.
 967          */
 968         e2fsck_hide_quota(ctx);
 969
 970         return;
 971 }
 972
 973 /*
 974  * Check to see if we should backup the master sb to the backup super
 975  * blocks.  Returns non-zero if the sb should be backed up.
 976  */
 977
 978 /*
 979  * A few flags are set on the fly by the kernel, but only in the
 980  * primary superblock.  This is actually a bad thing, and we should
 981  * try to discourage it in the future.  In particular, for the newer
 982  * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and
 983  * EXT3_FEATURE_INCOMPAT_EXTENTS.  So some of these may go away in the
 984  * future.  EXT3_FEATURE_INCOMPAT_RECOVER may also get set when
 985  * copying the primary superblock during online resize.
 986  *
 987  * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but
 988  * unfortunately, we shouldn't ignore it since if it's not set in the
 989  * backup, the extended attributes in the filesystem will be stripped
 990  * away.
 991  */
 992 #define FEATURE_RO_COMPAT_IGNORE        (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 993                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
 994 #define FEATURE_INCOMPAT_IGNORE         (EXT3_FEATURE_INCOMPAT_EXTENTS| \
 995                                          EXT3_FEATURE_INCOMPAT_RECOVER)
 996
 997 int check_backup_super_block(e2fsck_t ctx)
 998 {
 999         ext2_filsys     fs = ctx->fs;
1000         errcode_t       retval;
1001         dgrp_t          g;
1002         blk64_t         sb;
1003         int             ret = 0;
1004         char            buf[SUPERBLOCK_SIZE];
1005         struct ext2_super_block *backup_sb;
1006
1007         /*
1008          * If we are already writing out the backup blocks, then we
1009          * don't need to test.  Also, if the filesystem is invalid, or
1010          * the check was aborted or cancelled, we also don't want to
1011          * do the backup.  If the filesystem was opened read-only then
1012          * we can't do the backup.
1013          */
1014         if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) ||
1015             !ext2fs_test_valid(fs) ||
1016             (fs->super->s_state & EXT2_ERROR_FS) ||
1017             (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) ||
1018             (ctx->options & E2F_OPT_READONLY))
1019                 return 0;
1020
1021         for (g = 1; g < fs->group_desc_count; g++) {
1022                 if (!ext2fs_bg_has_super(fs, g))
1023                         continue;
1024
1025                 sb = ext2fs_group_first_block2(fs, g);
1026
1027                 retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE,
1028                                              buf);
1029                 if (retval)
1030                         continue;
1031                 backup_sb = (struct ext2_super_block *) buf;
1032 #ifdef WORDS_BIGENDIAN
1033                 ext2fs_swap_super(backup_sb);
1034 #endif
1035                 if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) ||
1036                     (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) ||
1037                     ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
1038                      EXT2_MAX_BLOCK_LOG_SIZE) ||
1039                     (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE))
1040                         continue;
1041
1042 #define SUPER_INCOMPAT_DIFFERENT(x)     \
1043         ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) !=   \
1044          (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE))
1045 #define SUPER_RO_COMPAT_DIFFERENT(x)    \
1046         ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) !=  \
1047          (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE))
1048 #define SUPER_DIFFERENT(x)              \
1049         (fs->super->x != backup_sb->x)
1050
1051                 if (SUPER_DIFFERENT(s_feature_compat) ||
1052                     SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
1053                     SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
1054                     SUPER_DIFFERENT(s_blocks_count) ||
1055                     SUPER_DIFFERENT(s_blocks_count_hi) ||
1056                     SUPER_DIFFERENT(s_inodes_count) ||
1057                     memcmp(fs->super->s_uuid, backup_sb->s_uuid,
1058                            sizeof(fs->super->s_uuid)))
1059                         ret = 1;
1060                 break;
1061         }
1062         return ret;
1063 }