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