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 int 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;
  41                 return 0;
  42         }
  43         return 1;
  44 }
  45
  46 static int check_super_value64(e2fsck_t ctx, const char *descr,
  47                                 __u64 value, int flags,
  48                                 __u64 min_val, __u64 max_val)
  49 {
  50         struct          problem_context pctx;
  51
  52         if ((flags & MIN_CHECK && value < min_val) ||
  53             (flags & MAX_CHECK && value > max_val) ||
  54             (flags & LOG2_CHECK && (value & (value - 1)) != 0)) {
  55                 clear_problem_context(&pctx);
  56                 pctx.num = value;
  57                 pctx.str = descr;
  58                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
  59                 ctx->flags |= E2F_FLAG_ABORT;
  60                 return 0;
  61         }
  62         return 1;
  63 }
  64
  65 /*
  66  * helper function to release an inode
  67  */
  68 struct process_block_struct {
  69         e2fsck_t        ctx;
  70         char            *buf;
  71         struct problem_context *pctx;
  72         int             truncating;
  73         int             truncate_offset;
  74         e2_blkcnt_t     truncate_block;
  75         int             truncated_blocks;
  76         int             abort;
  77         errcode_t       errcode;
  78         blk64_t last_cluster;
  79         struct ext2_inode_large *inode;
  80 };
  81
  82 static int release_inode_block(ext2_filsys fs,
  83                                blk64_t  *block_nr,
  84                                e2_blkcnt_t blockcnt,
  85                                blk64_t  ref_blk EXT2FS_ATTR((unused)),
  86                                int      ref_offset EXT2FS_ATTR((unused)),
  87                                void *priv_data)
  88 {
  89         struct process_block_struct *pb;
  90         e2fsck_t                ctx;
  91         struct problem_context  *pctx;
  92         blk64_t                 blk = *block_nr;
  93         blk64_t                 cluster = EXT2FS_B2C(fs, *block_nr);
  94         int                     retval = 0;
  95
  96         pb = (struct process_block_struct *) priv_data;
  97         ctx = pb->ctx;
  98         pctx = pb->pctx;
  99
 100         pctx->blk = blk;
 101         pctx->blkcount = blockcnt;
 102
 103         if (blk == 0)
 104                 return 0;
 105
 106         if (pb->last_cluster == cluster)
 107                 return 0;
 108
 109         pb->last_cluster = cluster;
 110
 111         if ((blk < fs->super->s_first_data_block) ||
 112             (blk >= ext2fs_blocks_count(fs->super))) {
 113                 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
 114         return_abort:
 115                 pb->abort = 1;
 116                 return BLOCK_ABORT;
 117         }
 118
 119         if (!ext2fs_test_block_bitmap2(fs->block_map, blk)) {
 120                 fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx);
 121                 goto return_abort;
 122         }
 123
 124         /*
 125          * If we are deleting an orphan, then we leave the fields alone.
 126          * If we are truncating an orphan, then update the inode fields
 127          * and clean up any partial block data.
 128          */
 129         if (pb->truncating) {
 130                 /*
 131                  * We only remove indirect blocks if they are
 132                  * completely empty.
 133                  */
 134                 if (blockcnt < 0) {
 135                         int     i, limit;
 136                         blk_t   *bp;
 137
 138                         pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
 139                                                         pb->buf);
 140                         if (pb->errcode)
 141                                 goto return_abort;
 142
 143                         limit = fs->blocksize >> 2;
 144                         for (i = 0, bp = (blk_t *) pb->buf;
 145                              i < limit;  i++, bp++)
 146                                 if (*bp)
 147                                         return 0;
 148                 }
 149                 /*
 150                  * We don't remove direct blocks until we've reached
 151                  * the truncation block.
 152                  */
 153                 if (blockcnt >= 0 && blockcnt < pb->truncate_block)
 154                         return 0;
 155                 /*
 156                  * If part of the last block needs truncating, we do
 157                  * it here.
 158                  */
 159                 if ((blockcnt == pb->truncate_block) && pb->truncate_offset) {
 160                         pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
 161                                                         pb->buf);
 162                         if (pb->errcode)
 163                                 goto return_abort;
 164                         memset(pb->buf + pb->truncate_offset, 0,
 165                                fs->blocksize - pb->truncate_offset);
 166                         pb->errcode = io_channel_write_blk64(fs->io, blk, 1,
 167                                                          pb->buf);
 168                         if (pb->errcode)
 169                                 goto return_abort;
 170                 }
 171                 pb->truncated_blocks++;
 172                 *block_nr = 0;
 173                 retval |= BLOCK_CHANGED;
 174         }
 175
 176         if (ctx->qctx)
 177                 quota_data_sub(ctx->qctx, pb->inode, 0, ctx->fs->blocksize);
 178         ext2fs_block_alloc_stats2(fs, blk, -1);
 179         ctx->free_blocks++;
 180         return retval;
 181 }
 182
 183 /*
 184  * This function releases an inode.  Returns 1 if an inconsistency was
 185  * found.  If the inode has a link count, then it is being truncated and
 186  * not deleted.
 187  */
 188 static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
 189                                 struct ext2_inode_large *inode, char *block_buf,
 190                                 struct problem_context *pctx)
 191 {
 192         struct process_block_struct     pb;
 193         ext2_filsys                     fs = ctx->fs;
 194         blk64_t                         blk;
 195         errcode_t                       retval;
 196         __u32                           count;
 197
 198         if (!ext2fs_inode_has_valid_blocks2(fs, EXT2_INODE(inode)))
 199                 return 0;
 200
 201         pb.buf = block_buf + 3 * ctx->fs->blocksize;
 202         pb.ctx = ctx;
 203         pb.abort = 0;
 204         pb.errcode = 0;
 205         pb.pctx = pctx;
 206         pb.last_cluster = 0;
 207         pb.inode = inode;
 208         if (inode->i_links_count) {
 209                 pb.truncating = 1;
 210                 pb.truncate_block = (e2_blkcnt_t)
 211                         ((EXT2_I_SIZE(inode) + fs->blocksize - 1) /
 212                          fs->blocksize);
 213                 pb.truncate_offset = inode->i_size % fs->blocksize;
 214         } else {
 215                 pb.truncating = 0;
 216                 pb.truncate_block = 0;
 217                 pb.truncate_offset = 0;
 218         }
 219         pb.truncated_blocks = 0;
 220         retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE,
 221                                       block_buf, release_inode_block, &pb);
 222         if (retval) {
 223                 com_err("release_inode_blocks", retval,
 224                         _("while calling ext2fs_block_iterate for inode %u"),
 225                         ino);
 226                 return 1;
 227         }
 228         if (pb.abort)
 229                 return 1;
 230
 231         /* Refresh the inode since ext2fs_block_iterate may have changed it */
 232         e2fsck_read_inode_full(ctx, ino, EXT2_INODE(inode), sizeof(*inode),
 233                         "release_inode_blocks");
 234
 235         if (pb.truncated_blocks)
 236                 ext2fs_iblk_sub_blocks(fs, EXT2_INODE(inode),
 237                                 pb.truncated_blocks);
 238
 239         blk = ext2fs_file_acl_block(fs, EXT2_INODE(inode));
 240         if (blk) {
 241                 retval = ext2fs_adjust_ea_refcount3(fs, blk, block_buf, -1,
 242                                 &count, ino);
 243                 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
 244                         retval = 0;
 245                         count = 1;
 246                 }
 247                 if (retval) {
 248                         com_err("release_inode_blocks", retval,
 249                 _("while calling ext2fs_adjust_ea_refcount2 for inode %u"),
 250                                 ino);
 251                         return 1;
 252                 }
 253                 if (count == 0) {
 254                         if (ctx->qctx)
 255                                 quota_data_sub(ctx->qctx, inode, 0,
 256                                                 ctx->fs->blocksize);
 257                         ext2fs_block_alloc_stats2(fs, blk, -1);
 258                         ctx->free_blocks++;
 259                 }
 260                 ext2fs_file_acl_block_set(fs, EXT2_INODE(inode), 0);
 261         }
 262         return 0;
 263 }
 264
 265 /* Load all quota data in preparation for orphan clearing. */
 266 static errcode_t e2fsck_read_all_quotas(e2fsck_t ctx)
 267 {
 268         ext2_ino_t qf_ino;
 269         enum quota_type qtype;
 270         errcode_t retval = 0;
 271
 272         if (!ext2fs_has_feature_quota(ctx->fs->super))
 273                 return retval;
 274
 275         retval = quota_init_context(&ctx->qctx, ctx->fs, 0);
 276         if (retval)
 277                 return retval;
 278
 279         for (qtype = 0 ; qtype < MAXQUOTAS; qtype++) {
 280                 qf_ino = *quota_sb_inump(ctx->fs->super, qtype);
 281                 if (qf_ino == 0)
 282                         continue;
 283
 284                 retval = quota_read_all_dquots(ctx->qctx, qf_ino, qtype,
 285                                                QREAD_USAGE | QREAD_LIMITS);
 286                 if (retval)
 287                         break;
 288         }
 289         if (retval)
 290                 quota_release_context(&ctx->qctx);
 291         return retval;
 292 }
 293
 294 /* Write all the quota info to disk. */
 295 static errcode_t e2fsck_write_all_quotas(e2fsck_t ctx)
 296 {
 297         struct problem_context pctx;
 298         enum quota_type qtype;
 299
 300         if (!ext2fs_has_feature_quota(ctx->fs->super))
 301                 return 0;
 302
 303         clear_problem_context(&pctx);
 304         for (qtype = 0 ; qtype < MAXQUOTAS; qtype++) {
 305                 pctx.num = qtype;
 306                 pctx.errcode = quota_write_inode(ctx->qctx, 1 << qtype);
 307                 if (pctx.errcode) {
 308                         fix_problem(ctx, PR_6_WRITE_QUOTAS, &pctx);
 309                         break;
 310                 }
 311         }
 312
 313         quota_release_context(&ctx->qctx);
 314         return pctx.errcode;
 315 }
 316
 317 /*
 318  * This function releases all of the orphan inodes.  It returns 1 if
 319  * it hit some error, and 0 on success.
 320  */
 321 static int release_orphan_inodes(e2fsck_t ctx)
 322 {
 323         ext2_filsys fs = ctx->fs;
 324         ext2_ino_t      ino, next_ino;
 325         struct ext2_inode_large inode;
 326         struct problem_context pctx;
 327         char *block_buf;
 328
 329         if ((ino = fs->super->s_last_orphan) == 0)
 330                 return 0;
 331
 332         clear_problem_context(&pctx);
 333         pctx.errcode = e2fsck_read_all_quotas(ctx);
 334         if (pctx.errcode) {
 335                 fix_problem(ctx, PR_0_QUOTA_INIT_CTX, &pctx);
 336                 return 1;
 337         }
 338
 339         /*
 340          * Win or lose, we won't be using the head of the orphan inode
 341          * list again.
 342          */
 343         fs->super->s_last_orphan = 0;
 344         ext2fs_mark_super_dirty(fs);
 345
 346         /*
 347          * If the filesystem contains errors, don't run the orphan
 348          * list, since the orphan list can't be trusted; and we're
 349          * going to be running a full e2fsck run anyway...
 350          */
 351         if (fs->super->s_state & EXT2_ERROR_FS) {
 352                 if (ctx->qctx)
 353                         quota_release_context(&ctx->qctx);
 354                 return 0;
 355         }
 356
 357         if ((ino < EXT2_FIRST_INODE(fs->super)) ||
 358             (ino > fs->super->s_inodes_count)) {
 359                 clear_problem_context(&pctx);
 360                 pctx.ino = ino;
 361                 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
 362                 goto err_qctx;
 363         }
 364
 365         block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
 366                                                     "block iterate buffer");
 367         e2fsck_read_bitmaps(ctx);
 368
 369         while (ino) {
 370                 e2fsck_read_inode_full(ctx, ino, EXT2_INODE(&inode),
 371                                 sizeof(inode), "release_orphan_inodes");
 372                 clear_problem_context(&pctx);
 373                 pctx.ino = ino;
 374                 pctx.inode = EXT2_INODE(&inode);
 375                 pctx.str = inode.i_links_count ? _("Truncating") :
 376                         _("Clearing");
 377
 378                 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
 379
 380                 next_ino = inode.i_dtime;
 381                 if (next_ino &&
 382                     ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
 383                      (next_ino > fs->super->s_inodes_count))) {
 384                         pctx.ino = next_ino;
 385                         fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
 386                         goto err_buf;
 387                 }
 388
 389                 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
 390                         goto err_buf;
 391
 392                 if (!inode.i_links_count) {
 393                         if (ctx->qctx)
 394                                 quota_data_inodes(ctx->qctx, &inode, ino, -1);
 395                         ext2fs_inode_alloc_stats2(fs, ino, -1,
 396                                                   LINUX_S_ISDIR(inode.i_mode));
 397                         ctx->free_inodes++;
 398                         inode.i_dtime = ctx->now;
 399                 } else {
 400                         inode.i_dtime = 0;
 401                 }
 402                 e2fsck_write_inode_full(ctx, ino, EXT2_INODE(&inode),
 403                                 sizeof(inode), "delete_file");
 404                 ino = next_ino;
 405         }
 406         ext2fs_free_mem(&block_buf);
 407         pctx.errcode = e2fsck_write_all_quotas(ctx);
 408         if (pctx.errcode)
 409                 goto err;
 410         return 0;
 411 err_buf:
 412         ext2fs_free_mem(&block_buf);
 413 err_qctx:
 414         if (ctx->qctx)
 415                 quota_release_context(&ctx->qctx);
 416 err:
 417         return 1;
 418 }
 419
 420 /*
 421  * Check the resize inode to make sure it is sane.  We check both for
 422  * the case where on-line resizing is not enabled (in which case the
 423  * resize inode should be cleared) as well as the case where on-line
 424  * resizing is enabled.
 425  */
 426 void check_resize_inode(e2fsck_t ctx)
 427 {
 428         ext2_filsys fs = ctx->fs;
 429         struct ext2_inode inode;
 430         struct problem_context  pctx;
 431         int             i, gdt_off, ind_off;
 432         dgrp_t          j;
 433         blk_t           blk, pblk;
 434         blk_t           expect; /* for resize inode, which is 32-bit only */
 435         __u32           *dind_buf = 0, *ind_buf;
 436         errcode_t       retval;
 437
 438         clear_problem_context(&pctx);
 439
 440         if (ext2fs_has_feature_resize_inode(fs->super) &&
 441             ext2fs_has_feature_meta_bg(fs->super) &&
 442             fix_problem(ctx, PR_0_DISABLE_RESIZE_INODE, &pctx)) {
 443                 ext2fs_clear_feature_resize_inode(fs->super);
 444                 fs->super->s_reserved_gdt_blocks = 0;
 445                 ext2fs_mark_super_dirty(fs);
 446         }
 447
 448         /*
 449          * If the resize inode feature isn't set, then
 450          * s_reserved_gdt_blocks must be zero.
 451          */
 452         if (!ext2fs_has_feature_resize_inode(fs->super)) {
 453                 if (fs->super->s_reserved_gdt_blocks) {
 454                         pctx.num = fs->super->s_reserved_gdt_blocks;
 455                         if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS,
 456                                         &pctx)) {
 457                                 fs->super->s_reserved_gdt_blocks = 0;
 458                                 ext2fs_mark_super_dirty(fs);
 459                         }
 460                 }
 461         }
 462
 463         /* Read the resize inode */
 464         pctx.ino = EXT2_RESIZE_INO;
 465         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
 466         if (retval) {
 467                 if (ext2fs_has_feature_resize_inode(fs->super))
 468                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 469                 return;
 470         }
 471
 472         /*
 473          * If the resize inode feature isn't set, check to make sure
 474          * the resize inode is cleared; then we're done.
 475          */
 476         if (!ext2fs_has_feature_resize_inode(fs->super)) {
 477                 for (i=0; i < EXT2_N_BLOCKS; i++) {
 478                         if (inode.i_block[i])
 479                                 break;
 480                 }
 481                 if ((i < EXT2_N_BLOCKS) &&
 482                     fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) {
 483                         memset(&inode, 0, sizeof(inode));
 484                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 485                                            "clear_resize");
 486                 }
 487                 return;
 488         }
 489
 490         /*
 491          * The resize inode feature is enabled; check to make sure the
 492          * only block in use is the double indirect block
 493          */
 494         blk = inode.i_block[EXT2_DIND_BLOCK];
 495         for (i=0; i < EXT2_N_BLOCKS; i++) {
 496                 if (i != EXT2_DIND_BLOCK && inode.i_block[i])
 497                         break;
 498         }
 499         if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count ||
 500             !(inode.i_mode & LINUX_S_IFREG) ||
 501             (blk < fs->super->s_first_data_block ||
 502              blk >= ext2fs_blocks_count(fs->super))) {
 503         resize_inode_invalid:
 504                 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) {
 505                         memset(&inode, 0, sizeof(inode));
 506                         e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
 507                                            "clear_resize");
 508                         ctx->flags |= E2F_FLAG_RESIZE_INODE;
 509                 }
 510                 if (!(ctx->options & E2F_OPT_READONLY)) {
 511                         fs->super->s_state &= ~EXT2_VALID_FS;
 512                         ext2fs_mark_super_dirty(fs);
 513                 }
 514                 goto cleanup;
 515         }
 516         dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2,
 517                                                     "resize dind buffer");
 518         ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize);
 519
 520         retval = ext2fs_read_ind_block(fs, blk, dind_buf);
 521         if (retval)
 522                 goto resize_inode_invalid;
 523
 524         gdt_off = fs->desc_blocks;
 525         pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks;
 526         if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0)
 527                 pblk++; /* Deal with 1024 blocksize bigalloc fs */
 528         for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4;
 529              i++, gdt_off++, pblk++) {
 530                 gdt_off %= fs->blocksize/4;
 531                 if (dind_buf[gdt_off] != pblk)
 532                         goto resize_inode_invalid;
 533                 retval = ext2fs_read_ind_block(fs, pblk, ind_buf);
 534                 if (retval)
 535                         goto resize_inode_invalid;
 536                 ind_off = 0;
 537                 for (j = 1; j < fs->group_desc_count; j++) {
 538                         if (!ext2fs_bg_has_super(fs, j))
 539                                 continue;
 540                         expect = pblk + EXT2_GROUPS_TO_BLOCKS(fs->super, j);
 541                         if (ind_buf[ind_off] != expect)
 542                                 goto resize_inode_invalid;
 543                         ind_off++;
 544                 }
 545         }
 546
 547 cleanup:
 548         if (dind_buf)
 549                 ext2fs_free_mem(&dind_buf);
 550
 551  }
 552
 553 /*
 554  * This function checks the dirhash signed/unsigned hint if necessary.
 555  */
 556 static void e2fsck_fix_dirhash_hint(e2fsck_t ctx)
 557 {
 558         struct ext2_super_block *sb = ctx->fs->super;
 559         struct problem_context pctx;
 560         char    c;
 561
 562         if ((ctx->options & E2F_OPT_READONLY) ||
 563             !ext2fs_has_feature_dir_index(sb) ||
 564             (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH)))
 565                 return;
 566
 567         c = (char) 255;
 568
 569         clear_problem_context(&pctx);
 570         if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) {
 571                 if (((int) c) == -1) {
 572                         sb->s_flags |= EXT2_FLAGS_SIGNED_HASH;
 573                 } else {
 574                         sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
 575                 }
 576                 ext2fs_mark_super_dirty(ctx->fs);
 577         }
 578 }
 579
 580
 581 void check_super_block(e2fsck_t ctx)
 582 {
 583         ext2_filsys fs = ctx->fs;
 584         blk64_t first_block, last_block;
 585         struct ext2_super_block *sb = fs->super;
 586         unsigned int    ipg_max;
 587         problem_t       problem;
 588         blk64_t blocks_per_group = fs->super->s_blocks_per_group;
 589         __u32   bpg_max, cpg_max;
 590         __u64   blks_max;
 591         int     inodes_per_block;
 592         int     inode_size;
 593         int     accept_time_fudge;
 594         int     broken_system_clock;
 595         dgrp_t  i;
 596         blk64_t should_be;
 597         struct problem_context  pctx;
 598         blk64_t free_blocks = 0;
 599         ext2_ino_t free_inodes = 0;
 600         int     csum_flag, clear_test_fs_flag;
 601
 602         inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
 603         ipg_max = inodes_per_block * (blocks_per_group - 4);
 604         if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
 605                 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
 606         cpg_max = 8 * EXT2_BLOCK_SIZE(sb);
 607         if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb))
 608                 cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb);
 609         bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs);
 610         if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
 611                 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);
 612
 613         ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 614                  sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
 615         ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
 616                  sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
 617         ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
 618                 sizeof(int) * fs->group_desc_count, "invalid_inode_table");
 619
 620         blks_max = (1ULL << 32) * EXT2_MAX_BLOCKS_PER_GROUP(fs->super);
 621         if (ext2fs_has_feature_64bit(fs->super)) {
 622                 if (blks_max > ((1ULL << 48) - 1))
 623                         blks_max = (1ULL << 48) - 1;
 624         } else {
 625                 if (blks_max > ((1ULL << 32) - 1))
 626                         blks_max = (1ULL << 32) - 1;
 627         }
 628
 629         clear_problem_context(&pctx);
 630
 631         /*
 632          * Verify the super block constants...
 633          */
 634         if (!check_super_value(ctx, "inodes_count", sb->s_inodes_count,
 635                                MIN_CHECK, 1, 0))
 636                 return;
 637         if (!check_super_value64(ctx, "blocks_count", ext2fs_blocks_count(sb),
 638                                  MIN_CHECK | MAX_CHECK, 1, blks_max))
 639                 return;
 640         if (!check_super_value(ctx, "first_data_block", sb->s_first_data_block,
 641                                MAX_CHECK, 0, ext2fs_blocks_count(sb)))
 642                 return;
 643         if (!check_super_value(ctx, "log_block_size", sb->s_log_block_size,
 644                                MIN_CHECK | MAX_CHECK, 0,
 645                                EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE))
 646                 return;
 647         if (!check_super_value(ctx, "log_cluster_size",
 648                                sb->s_log_cluster_size,
 649                                MIN_CHECK | MAX_CHECK, sb->s_log_block_size,
 650                                (EXT2_MAX_CLUSTER_LOG_SIZE -
 651                                 EXT2_MIN_CLUSTER_LOG_SIZE)))
 652                 return;
 653         if (!check_super_value(ctx, "clusters_per_group",
 654                                sb->s_clusters_per_group,
 655                                MIN_CHECK | MAX_CHECK, 8, cpg_max))
 656                 return;
 657         if (!check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
 658                                MIN_CHECK | MAX_CHECK, 8, bpg_max))
 659                 return;
 660         if (!check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
 661                                MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max))
 662                 return;
 663         if (!check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb),
 664                                MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2))
 665                 return;
 666         if (!check_super_value(ctx, "reserved_gdt_blocks",
 667                                sb->s_reserved_gdt_blocks, MAX_CHECK, 0,
 668                                fs->blocksize / sizeof(__u32)))
 669                 return;
 670         if (!check_super_value(ctx, "desc_size",
 671                                sb->s_desc_size, MAX_CHECK | LOG2_CHECK, 0,
 672                                EXT2_MAX_DESC_SIZE))
 673                 return;
 674
 675         should_be = (__u64)sb->s_inodes_per_group * fs->group_desc_count;
 676         if (should_be > ~0U) {
 677                 pctx.num = should_be;
 678                 fix_problem(ctx, PR_0_INODE_COUNT_BIG, &pctx);
 679                 ctx->flags |= E2F_FLAG_ABORT;
 680                 return;
 681         }
 682         if (sb->s_inodes_count != should_be) {
 683                 pctx.ino = sb->s_inodes_count;
 684                 pctx.ino2 = should_be;
 685                 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
 686                         sb->s_inodes_count = should_be;
 687                         ext2fs_mark_super_dirty(fs);
 688                 } else {
 689                         pctx.num = sb->s_inodes_count;
 690                         pctx.str = "inodes_count";
 691                         fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
 692                         ctx->flags |= E2F_FLAG_ABORT;
 693                         return;
 694                 }
 695         }
 696         if (sb->s_rev_level > EXT2_GOOD_OLD_REV &&
 697             !check_super_value(ctx, "first_ino", sb->s_first_ino,
 698                                MIN_CHECK | MAX_CHECK,
 699                                EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count))
 700                 return;
 701         inode_size = EXT2_INODE_SIZE(sb);
 702         if (!check_super_value(ctx, "inode_size",
 703                                inode_size, MIN_CHECK | MAX_CHECK | LOG2_CHECK,
 704                                EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize))
 705                 return;
 706         if (sb->s_blocks_per_group != (sb->s_clusters_per_group *
 707                                        EXT2FS_CLUSTER_RATIO(fs))) {
 708                 pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs);
 709                 pctx.str = "block_size";
 710                 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
 711                 ctx->flags |= E2F_FLAG_ABORT;
 712                 return;
 713         }
 714
 715         if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) &&
 716             (ctx->num_blocks < ext2fs_blocks_count(sb))) {
 717                 pctx.blk = ext2fs_blocks_count(sb);
 718                 pctx.blk2 = ctx->num_blocks;
 719                 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
 720                         ctx->flags |= E2F_FLAG_ABORT;
 721                         return;
 722                 }
 723         }
 724
 725         should_be = (sb->s_log_block_size == 0 &&
 726                      EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0;
 727         if (sb->s_first_data_block != should_be) {
 728                 pctx.blk = sb->s_first_data_block;
 729                 pctx.blk2 = should_be;
 730                 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
 731                 ctx->flags |= E2F_FLAG_ABORT;
 732                 return;
 733         }
 734
 735         if (EXT2_INODE_SIZE(sb) > EXT2_GOOD_OLD_INODE_SIZE) {
 736                 unsigned min =
 737                         sizeof(((struct ext2_inode_large *) 0)->i_extra_isize) +
 738                         sizeof(((struct ext2_inode_large *) 0)->i_checksum_hi);
 739                 unsigned max = EXT2_INODE_SIZE(sb) - EXT2_GOOD_OLD_INODE_SIZE;
 740                 pctx.num = sb->s_min_extra_isize;
 741                 if (sb->s_min_extra_isize &&
 742                     (sb->s_min_extra_isize < min ||
 743                      sb->s_min_extra_isize > max ||
 744                      sb->s_min_extra_isize & 3) &&
 745                     fix_problem(ctx, PR_0_BAD_MIN_EXTRA_ISIZE, &pctx)) {
 746                         sb->s_min_extra_isize =
 747                                 (sizeof(struct ext2_inode_large) -
 748                                  EXT2_GOOD_OLD_INODE_SIZE);
 749                         ext2fs_mark_super_dirty(fs);
 750                 }
 751                 pctx.num = sb->s_want_extra_isize;
 752                 if (sb->s_want_extra_isize &&
 753                     (sb->s_want_extra_isize < min ||
 754                      sb->s_want_extra_isize > max ||
 755                      sb->s_want_extra_isize & 3) &&
 756                     fix_problem(ctx, PR_0_BAD_WANT_EXTRA_ISIZE, &pctx)) {
 757                         sb->s_want_extra_isize =
 758                                 (sizeof(struct ext2_inode_large) -
 759                                  EXT2_GOOD_OLD_INODE_SIZE);
 760                         ext2fs_mark_super_dirty(fs);
 761                 }
 762         }
 763
 764         /* Are metadata_csum and uninit_bg both set? */
 765         if (ext2fs_has_feature_metadata_csum(fs->super) &&
 766             ext2fs_has_feature_gdt_csum(fs->super) &&
 767             fix_problem(ctx, PR_0_META_AND_GDT_CSUM_SET, &pctx)) {
 768                 ext2fs_clear_feature_gdt_csum(fs->super);
 769                 ext2fs_mark_super_dirty(fs);
 770                 for (i = 0; i < fs->group_desc_count; i++)
 771                         ext2fs_group_desc_csum_set(fs, i);
 772         }
 773
 774         /* We can't have ^metadata_csum,metadata_csum_seed */
 775         if (!ext2fs_has_feature_metadata_csum(fs->super) &&
 776             ext2fs_has_feature_csum_seed(fs->super) &&
 777             fix_problem(ctx, PR_0_CSUM_SEED_WITHOUT_META_CSUM, &pctx)) {
 778                 ext2fs_clear_feature_csum_seed(fs->super);
 779                 fs->super->s_checksum_seed = 0;
 780                 ext2fs_mark_super_dirty(fs);
 781         }
 782
 783         /* Is 64bit set and extents unset? */
 784         if (ext2fs_has_feature_64bit(fs->super) &&
 785             !ext2fs_has_feature_extents(fs->super) &&
 786             fix_problem(ctx, PR_0_64BIT_WITHOUT_EXTENTS, &pctx)) {
 787                 ext2fs_set_feature_extents(fs->super);
 788                 ext2fs_mark_super_dirty(fs);
 789         }
 790
 791         /* Did user ask us to convert files to extents? */
 792         if (ctx->options & E2F_OPT_CONVERT_BMAP) {
 793                 ext2fs_set_feature_extents(fs->super);
 794                 ext2fs_mark_super_dirty(fs);
 795         }
 796
 797         if (ext2fs_has_feature_meta_bg(fs->super) &&
 798             (fs->super->s_first_meta_bg > fs->desc_blocks)) {
 799                 pctx.group = fs->desc_blocks;
 800                 pctx.num = fs->super->s_first_meta_bg;
 801                 if (fix_problem(ctx, PR_0_FIRST_META_BG_TOO_BIG, &pctx)) {
 802                         ext2fs_clear_feature_meta_bg(fs->super);
 803                         fs->super->s_first_meta_bg = 0;
 804                         ext2fs_mark_super_dirty(fs);
 805                 }
 806         }
 807
 808         /*
 809          * Verify the group descriptors....
 810          */
 811         first_block = sb->s_first_data_block;
 812         last_block = ext2fs_blocks_count(sb)-1;
 813
 814         csum_flag = ext2fs_has_group_desc_csum(fs);
 815         for (i = 0; i < fs->group_desc_count; i++) {
 816                 pctx.group = i;
 817
 818                 if (!ext2fs_has_feature_flex_bg(fs->super)) {
 819                         first_block = ext2fs_group_first_block2(fs, i);
 820                         last_block = ext2fs_group_last_block2(fs, i);
 821                 }
 822
 823                 if ((ext2fs_block_bitmap_loc(fs, i) < first_block) ||
 824                     (ext2fs_block_bitmap_loc(fs, i) > last_block)) {
 825                         pctx.blk = ext2fs_block_bitmap_loc(fs, i);
 826                         if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
 827                                 ext2fs_block_bitmap_loc_set(fs, i, 0);
 828                 }
 829                 if (ext2fs_block_bitmap_loc(fs, i) == 0) {
 830                         ctx->invalid_block_bitmap_flag[i]++;
 831                         ctx->invalid_bitmaps++;
 832                 }
 833                 if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) ||
 834                     (ext2fs_inode_bitmap_loc(fs, i) > last_block)) {
 835                         pctx.blk = ext2fs_inode_bitmap_loc(fs, i);
 836                         if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
 837                                 ext2fs_inode_bitmap_loc_set(fs, i, 0);
 838                 }
 839                 if (ext2fs_inode_bitmap_loc(fs, i) == 0) {
 840                         ctx->invalid_inode_bitmap_flag[i]++;
 841                         ctx->invalid_bitmaps++;
 842                 }
 843                 if ((ext2fs_inode_table_loc(fs, i) < first_block) ||
 844                     ((ext2fs_inode_table_loc(fs, i) +
 845                       fs->inode_blocks_per_group - 1) > last_block)) {
 846                         pctx.blk = ext2fs_inode_table_loc(fs, i);
 847                         if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
 848                                 ext2fs_inode_table_loc_set(fs, i, 0);
 849                 }
 850                 if (ext2fs_inode_table_loc(fs, i) == 0) {
 851                         ctx->invalid_inode_table_flag[i]++;
 852                         ctx->invalid_bitmaps++;
 853                 }
 854                 free_blocks += ext2fs_bg_free_blocks_count(fs, i);
 855                 free_inodes += ext2fs_bg_free_inodes_count(fs, i);
 856
 857                 if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) ||
 858                     (ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) ||
 859                     (ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group))
 860                         ext2fs_unmark_valid(fs);
 861
 862                 should_be = 0;
 863                 if (!ext2fs_group_desc_csum_verify(fs, i)) {
 864                         pctx.csum1 = ext2fs_bg_checksum(fs, i);
 865                         pctx.csum2 = ext2fs_group_desc_csum(fs, i);
 866                         if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) {
 867                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 868                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
 869                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 870                                 should_be = 1;
 871                         }
 872                         ext2fs_unmark_valid(fs);
 873                 }
 874
 875                 if (!csum_flag &&
 876                     (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) ||
 877                      ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) ||
 878                      ext2fs_bg_itable_unused(fs, i) != 0)) {
 879                         if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) {
 880                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 881                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
 882                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 883                                 should_be = 1;
 884                         }
 885                         ext2fs_unmark_valid(fs);
 886                 }
 887
 888                 if (i == fs->group_desc_count - 1 &&
 889                     ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) {
 890                         if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) {
 891                                 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
 892                                 should_be = 1;
 893                         }
 894                         ext2fs_unmark_valid(fs);
 895                 }
 896
 897                 if (csum_flag &&
 898                     (ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) ||
 899                      ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) {
 900                         pctx.blk = ext2fs_bg_itable_unused(fs, i);
 901                         if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) {
 902                                 ext2fs_bg_itable_unused_set(fs, i, 0);
 903                                 should_be = 1;
 904                         }
 905                         ext2fs_unmark_valid(fs);
 906                 }
 907
 908                 if (should_be)
 909                         ext2fs_group_desc_csum_set(fs, i);
 910                 /* If the user aborts e2fsck by typing ^C, stop right away */
 911                 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 912                         return;
 913         }
 914
 915         ctx->free_blocks = EXT2FS_C2B(fs, free_blocks);
 916         ctx->free_inodes = free_inodes;
 917
 918         if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) ||
 919             (sb->s_free_inodes_count > sb->s_inodes_count))
 920                 ext2fs_unmark_valid(fs);
 921
 922
 923         /*
 924          * If we have invalid bitmaps, set the error state of the
 925          * filesystem.
 926          */
 927         if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
 928                 sb->s_state &= ~EXT2_VALID_FS;
 929                 ext2fs_mark_super_dirty(fs);
 930         }
 931
 932         clear_problem_context(&pctx);
 933
 934 #ifndef EXT2_SKIP_UUID
 935         /*
 936          * If the UUID field isn't assigned, assign it.
 937          * Skip if checksums are enabled and the filesystem is mounted,
 938          * if the id changes under the kernel remounting rw may fail.
 939          */
 940         if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid) &&
 941             !ext2fs_has_feature_metadata_csum(ctx->fs->super) &&
 942             (!csum_flag || !(ctx->mount_flags & EXT2_MF_MOUNTED))) {
 943                 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
 944                         uuid_generate(sb->s_uuid);
 945                         ext2fs_init_csum_seed(fs);
 946                         fs->flags |= EXT2_FLAG_DIRTY;
 947                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 948                 }
 949         }
 950 #endif
 951
 952         /*
 953          * Check to see if we should disable the test_fs flag
 954          */
 955         profile_get_boolean(ctx->profile, "options",
 956                             "clear_test_fs_flag", 0, 1,
 957                             &clear_test_fs_flag);
 958         if (!(ctx->options & E2F_OPT_READONLY) &&
 959             clear_test_fs_flag &&
 960             (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) &&
 961             (fs_proc_check("ext4") || check_for_modules("ext4"))) {
 962                 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) {
 963                         fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS;
 964                         fs->flags |= EXT2_FLAG_DIRTY;
 965                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 966                 }
 967         }
 968
 969         /*
 970          * For the Hurd, check to see if the filetype option is set,
 971          * since it doesn't support it.
 972          */
 973         if (!(ctx->options & E2F_OPT_READONLY) &&
 974             fs->super->s_creator_os == EXT2_OS_HURD &&
 975             ext2fs_has_feature_filetype(fs->super)) {
 976                 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
 977                         ext2fs_clear_feature_filetype(fs->super);
 978                         ext2fs_mark_super_dirty(fs);
 979                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 980                 }
 981         }
 982
 983         /*
 984          * If we have any of the compatibility flags set, we need to have a
 985          * revision 1 filesystem.  Most kernels will not check the flags on
 986          * a rev 0 filesystem and we may have corruption issues because of
 987          * the incompatible changes to the filesystem.
 988          */
 989         if (!(ctx->options & E2F_OPT_READONLY) &&
 990             fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
 991             (fs->super->s_feature_compat ||
 992              fs->super->s_feature_ro_compat ||
 993              fs->super->s_feature_incompat) &&
 994             fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
 995                 ext2fs_update_dynamic_rev(fs);
 996                 ext2fs_mark_super_dirty(fs);
 997                 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 998         }
 999
1000         /*
1001          * Clean up any orphan inodes, if present.
1002          */
1003         if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
1004                 fs->super->s_state &= ~EXT2_VALID_FS;
1005                 ext2fs_mark_super_dirty(fs);
1006         }
1007
1008         /*
1009          * Unfortunately, due to Windows' unfortunate design decision
1010          * to configure the hardware clock to tick localtime, instead
1011          * of the more proper and less error-prone UTC time, many
1012          * users end up in the situation where the system clock is
1013          * incorrectly set at the time when e2fsck is run.
1014          *
1015          * Historically this was usually due to some distributions
1016          * having buggy init scripts and/or installers that didn't
1017          * correctly detect this case and take appropriate
1018          * countermeasures.  However, it's still possible, despite the
1019          * best efforts of init script and installer authors to not be
1020          * able to detect this misconfiguration, usually due to a
1021          * buggy or misconfigured virtualization manager or the
1022          * installer not having access to a network time server during
1023          * the installation process.  So by default, we allow the
1024          * superblock times to be fudged by up to 24 hours.  This can
1025          * be disabled by setting options.accept_time_fudge to the
1026          * boolean value of false in e2fsck.conf.  We also support
1027          * options.buggy_init_scripts for backwards compatibility.
1028          */
1029         profile_get_boolean(ctx->profile, "options", "accept_time_fudge",
1030                             0, 1, &accept_time_fudge);
1031         profile_get_boolean(ctx->profile, "options", "buggy_init_scripts",
1032                             0, accept_time_fudge, &accept_time_fudge);
1033         ctx->time_fudge = accept_time_fudge ? 86400 : 0;
1034
1035         profile_get_boolean(ctx->profile, "options", "broken_system_clock",
1036                             0, 0, &broken_system_clock);
1037
1038         /*
1039          * Check to see if the superblock last mount time or last
1040          * write time is in the future.
1041          */
1042         if (((ctx->options & E2F_OPT_FORCE) || fs->super->s_checkinterval) &&
1043             !broken_system_clock && !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
1044             (fs->super->s_mtime > (__u32) ctx->now)) {
1045                 pctx.num = fs->super->s_mtime;
1046                 problem = PR_0_FUTURE_SB_LAST_MOUNT;
1047                 if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge)
1048                         problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED;
1049                 if (fix_problem(ctx, problem, &pctx)) {
1050                         fs->super->s_mtime = ctx->now;
1051                         fs->flags |= EXT2_FLAG_DIRTY;
1052                 }
1053         }
1054         if (((ctx->options & E2F_OPT_FORCE) || fs->super->s_checkinterval) &&
1055             !broken_system_clock && !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
1056             (fs->super->s_wtime > (__u32) ctx->now)) {
1057                 pctx.num = fs->super->s_wtime;
1058                 problem = PR_0_FUTURE_SB_LAST_WRITE;
1059                 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge)
1060                         problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED;
1061                 if (fix_problem(ctx, problem, &pctx)) {
1062                         fs->super->s_wtime = ctx->now;
1063                         fs->flags |= EXT2_FLAG_DIRTY;
1064                 }
1065         }
1066
1067         e2fsck_validate_quota_inodes(ctx);
1068
1069         /*
1070          * Move the ext3 journal file, if necessary.
1071          */
1072         e2fsck_move_ext3_journal(ctx);
1073
1074         /*
1075          * Fix journal hint, if necessary
1076          */
1077         e2fsck_fix_ext3_journal_hint(ctx);
1078
1079         /*
1080          * Add dirhash hint if necessary
1081          */
1082         e2fsck_fix_dirhash_hint(ctx);
1083
1084         /*
1085          * Hide quota inodes if necessary.
1086          */
1087         e2fsck_hide_quota(ctx);
1088
1089         return;
1090 }
1091
1092 /*
1093  * Check to see if we should backup the master sb to the backup super
1094  * blocks.  Returns non-zero if the sb should be backed up.
1095  */
1096
1097 /*
1098  * A few flags are set on the fly by the kernel, but only in the
1099  * primary superblock.  This is actually a bad thing, and we should
1100  * try to discourage it in the future.  In particular, for the newer
1101  * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and
1102  * EXT3_FEATURE_INCOMPAT_EXTENTS.  So some of these may go away in the
1103  * future.  EXT3_FEATURE_INCOMPAT_RECOVER may also get set when
1104  * copying the primary superblock during online resize.
1105  *
1106  * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but
1107  * unfortunately, we shouldn't ignore it since if it's not set in the
1108  * backup, the extended attributes in the filesystem will be stripped
1109  * away.
1110  */
1111 #define FEATURE_RO_COMPAT_IGNORE        (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
1112                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
1113 #define FEATURE_INCOMPAT_IGNORE         (EXT3_FEATURE_INCOMPAT_EXTENTS| \
1114                                          EXT3_FEATURE_INCOMPAT_RECOVER)
1115
1116 int check_backup_super_block(e2fsck_t ctx)
1117 {
1118         ext2_filsys     fs = ctx->fs;
1119         errcode_t       retval;
1120         dgrp_t          g;
1121         blk64_t         sb;
1122         int             ret = 0;
1123         char            buf[SUPERBLOCK_SIZE];
1124         struct ext2_super_block *backup_sb;
1125
1126         /*
1127          * If we are already writing out the backup blocks, then we
1128          * don't need to test.  Also, if the filesystem is invalid, or
1129          * the check was aborted or cancelled, we also don't want to
1130          * do the backup.  If the filesystem was opened read-only then
1131          * we can't do the backup.
1132          */
1133         if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) ||
1134             !ext2fs_test_valid(fs) ||
1135             (fs->super->s_state & EXT2_ERROR_FS) ||
1136             (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) ||
1137             (ctx->options & E2F_OPT_READONLY))
1138                 return 0;
1139
1140         for (g = 1; g < fs->group_desc_count; g++) {
1141                 if (!ext2fs_bg_has_super(fs, g))
1142                         continue;
1143
1144                 sb = ext2fs_group_first_block2(fs, g);
1145
1146                 retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE,
1147                                              buf);
1148                 if (retval)
1149                         continue;
1150                 backup_sb = (struct ext2_super_block *) buf;
1151 #ifdef WORDS_BIGENDIAN
1152                 ext2fs_swap_super(backup_sb);
1153 #endif
1154                 if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) ||
1155                     (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) ||
1156                     ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
1157                      EXT2_MAX_BLOCK_LOG_SIZE) ||
1158                     (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE))
1159                         continue;
1160
1161 #define SUPER_INCOMPAT_DIFFERENT(x)     \
1162         ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) !=   \
1163          (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE))
1164 #define SUPER_RO_COMPAT_DIFFERENT(x)    \
1165         ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) !=  \
1166          (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE))
1167 #define SUPER_DIFFERENT(x)              \
1168         (fs->super->x != backup_sb->x)
1169
1170                 if (SUPER_DIFFERENT(s_feature_compat) ||
1171                     SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
1172                     SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
1173                     SUPER_DIFFERENT(s_blocks_count) ||
1174                     SUPER_DIFFERENT(s_blocks_count_hi) ||
1175                     SUPER_DIFFERENT(s_inodes_count) ||
1176                     memcmp(fs->super->s_uuid, backup_sb->s_uuid,
1177                            sizeof(fs->super->s_uuid)))
1178                         ret = 1;
1179                 break;
1180         }
1181         return ret;
1182 }