fs/xfs/scrub/agheader.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_trans_resv.h"
  11 #include "xfs_mount.h"
  12 #include "xfs_btree.h"
  13 #include "xfs_sb.h"
  14 #include "xfs_alloc.h"
  15 #include "xfs_ialloc.h"
  16 #include "xfs_rmap.h"
  17 #include "xfs_ag.h"
  18 #include "scrub/scrub.h"
  19 #include "scrub/common.h"
  20
  21 /* Superblock */
  22
  23 /* Cross-reference with the other btrees. */
  24 STATIC void
  25 xchk_superblock_xref(
  26         struct xfs_scrub        *sc,
  27         struct xfs_buf          *bp)
  28 {
  29         struct xfs_mount        *mp = sc->mp;
  30         xfs_agnumber_t          agno = sc->sm->sm_agno;
  31         xfs_agblock_t           agbno;
  32         int                     error;
  33
  34         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
  35                 return;
  36
  37         agbno = XFS_SB_BLOCK(mp);
  38
  39         error = xchk_ag_init_existing(sc, agno, &sc->sa);
  40         if (!xchk_xref_process_error(sc, agno, agbno, &error))
  41                 return;
  42
  43         xchk_xref_is_used_space(sc, agbno, 1);
  44         xchk_xref_is_not_inode_chunk(sc, agbno, 1);
  45         xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_FS);
  46         xchk_xref_is_not_shared(sc, agbno, 1);
  47
  48         /* scrub teardown will take care of sc->sa for us */
  49 }
  50
  51 /*
  52  * Scrub the filesystem superblock.
  53  *
  54  * Note: We do /not/ attempt to check AG 0's superblock.  Mount is
  55  * responsible for validating all the geometry information in sb 0, so
  56  * if the filesystem is capable of initiating online scrub, then clearly
  57  * sb 0 is ok and we can use its information to check everything else.
  58  */
  59 int
  60 xchk_superblock(
  61         struct xfs_scrub        *sc)
  62 {
  63         struct xfs_mount        *mp = sc->mp;
  64         struct xfs_buf          *bp;
  65         struct xfs_dsb          *sb;
  66         struct xfs_perag        *pag;
  67         xfs_agnumber_t          agno;
  68         uint32_t                v2_ok;
  69         __be32                  features_mask;
  70         int                     error;
  71         __be16                  vernum_mask;
  72
  73         agno = sc->sm->sm_agno;
  74         if (agno == 0)
  75                 return 0;
  76
  77         /*
  78          * Grab an active reference to the perag structure.  If we can't get
  79          * it, we're racing with something that's tearing down the AG, so
  80          * signal that the AG no longer exists.
  81          */
  82         pag = xfs_perag_get(mp, agno);
  83         if (!pag)
  84                 return -ENOENT;
  85
  86         error = xfs_sb_read_secondary(mp, sc->tp, agno, &bp);
  87         /*
  88          * The superblock verifier can return several different error codes
  89          * if it thinks the superblock doesn't look right.  For a mount these
  90          * would all get bounced back to userspace, but if we're here then the
  91          * fs mounted successfully, which means that this secondary superblock
  92          * is simply incorrect.  Treat all these codes the same way we treat
  93          * any corruption.
  94          */
  95         switch (error) {
  96         case -EINVAL:   /* also -EWRONGFS */
  97         case -ENOSYS:
  98         case -EFBIG:
  99                 error = -EFSCORRUPTED;
 100                 fallthrough;
 101         default:
 102                 break;
 103         }
 104         if (!xchk_process_error(sc, agno, XFS_SB_BLOCK(mp), &error))
 105                 goto out_pag;
 106
 107         sb = bp->b_addr;
 108
 109         /*
 110          * Verify the geometries match.  Fields that are permanently
 111          * set by mkfs are checked; fields that can be updated later
 112          * (and are not propagated to backup superblocks) are preen
 113          * checked.
 114          */
 115         if (sb->sb_blocksize != cpu_to_be32(mp->m_sb.sb_blocksize))
 116                 xchk_block_set_corrupt(sc, bp);
 117
 118         if (sb->sb_dblocks != cpu_to_be64(mp->m_sb.sb_dblocks))
 119                 xchk_block_set_corrupt(sc, bp);
 120
 121         if (sb->sb_rblocks != cpu_to_be64(mp->m_sb.sb_rblocks))
 122                 xchk_block_set_corrupt(sc, bp);
 123
 124         if (sb->sb_rextents != cpu_to_be64(mp->m_sb.sb_rextents))
 125                 xchk_block_set_corrupt(sc, bp);
 126
 127         if (!uuid_equal(&sb->sb_uuid, &mp->m_sb.sb_uuid))
 128                 xchk_block_set_preen(sc, bp);
 129
 130         if (sb->sb_logstart != cpu_to_be64(mp->m_sb.sb_logstart))
 131                 xchk_block_set_corrupt(sc, bp);
 132
 133         if (sb->sb_rootino != cpu_to_be64(mp->m_sb.sb_rootino))
 134                 xchk_block_set_preen(sc, bp);
 135
 136         if (sb->sb_rbmino != cpu_to_be64(mp->m_sb.sb_rbmino))
 137                 xchk_block_set_preen(sc, bp);
 138
 139         if (sb->sb_rsumino != cpu_to_be64(mp->m_sb.sb_rsumino))
 140                 xchk_block_set_preen(sc, bp);
 141
 142         if (sb->sb_rextsize != cpu_to_be32(mp->m_sb.sb_rextsize))
 143                 xchk_block_set_corrupt(sc, bp);
 144
 145         if (sb->sb_agblocks != cpu_to_be32(mp->m_sb.sb_agblocks))
 146                 xchk_block_set_corrupt(sc, bp);
 147
 148         if (sb->sb_agcount != cpu_to_be32(mp->m_sb.sb_agcount))
 149                 xchk_block_set_corrupt(sc, bp);
 150
 151         if (sb->sb_rbmblocks != cpu_to_be32(mp->m_sb.sb_rbmblocks))
 152                 xchk_block_set_corrupt(sc, bp);
 153
 154         if (sb->sb_logblocks != cpu_to_be32(mp->m_sb.sb_logblocks))
 155                 xchk_block_set_corrupt(sc, bp);
 156
 157         /* Check sb_versionnum bits that are set at mkfs time. */
 158         vernum_mask = cpu_to_be16(~XFS_SB_VERSION_OKBITS |
 159                                   XFS_SB_VERSION_NUMBITS |
 160                                   XFS_SB_VERSION_ALIGNBIT |
 161                                   XFS_SB_VERSION_DALIGNBIT |
 162                                   XFS_SB_VERSION_SHAREDBIT |
 163                                   XFS_SB_VERSION_LOGV2BIT |
 164                                   XFS_SB_VERSION_SECTORBIT |
 165                                   XFS_SB_VERSION_EXTFLGBIT |
 166                                   XFS_SB_VERSION_DIRV2BIT);
 167         if ((sb->sb_versionnum & vernum_mask) !=
 168             (cpu_to_be16(mp->m_sb.sb_versionnum) & vernum_mask))
 169                 xchk_block_set_corrupt(sc, bp);
 170
 171         /* Check sb_versionnum bits that can be set after mkfs time. */
 172         vernum_mask = cpu_to_be16(XFS_SB_VERSION_ATTRBIT |
 173                                   XFS_SB_VERSION_NLINKBIT |
 174                                   XFS_SB_VERSION_QUOTABIT);
 175         if ((sb->sb_versionnum & vernum_mask) !=
 176             (cpu_to_be16(mp->m_sb.sb_versionnum) & vernum_mask))
 177                 xchk_block_set_preen(sc, bp);
 178
 179         if (sb->sb_sectsize != cpu_to_be16(mp->m_sb.sb_sectsize))
 180                 xchk_block_set_corrupt(sc, bp);
 181
 182         if (sb->sb_inodesize != cpu_to_be16(mp->m_sb.sb_inodesize))
 183                 xchk_block_set_corrupt(sc, bp);
 184
 185         if (sb->sb_inopblock != cpu_to_be16(mp->m_sb.sb_inopblock))
 186                 xchk_block_set_corrupt(sc, bp);
 187
 188         if (memcmp(sb->sb_fname, mp->m_sb.sb_fname, sizeof(sb->sb_fname)))
 189                 xchk_block_set_preen(sc, bp);
 190
 191         if (sb->sb_blocklog != mp->m_sb.sb_blocklog)
 192                 xchk_block_set_corrupt(sc, bp);
 193
 194         if (sb->sb_sectlog != mp->m_sb.sb_sectlog)
 195                 xchk_block_set_corrupt(sc, bp);
 196
 197         if (sb->sb_inodelog != mp->m_sb.sb_inodelog)
 198                 xchk_block_set_corrupt(sc, bp);
 199
 200         if (sb->sb_inopblog != mp->m_sb.sb_inopblog)
 201                 xchk_block_set_corrupt(sc, bp);
 202
 203         if (sb->sb_agblklog != mp->m_sb.sb_agblklog)
 204                 xchk_block_set_corrupt(sc, bp);
 205
 206         if (sb->sb_rextslog != mp->m_sb.sb_rextslog)
 207                 xchk_block_set_corrupt(sc, bp);
 208
 209         if (sb->sb_imax_pct != mp->m_sb.sb_imax_pct)
 210                 xchk_block_set_preen(sc, bp);
 211
 212         /*
 213          * Skip the summary counters since we track them in memory anyway.
 214          * sb_icount, sb_ifree, sb_fdblocks, sb_frexents
 215          */
 216
 217         if (sb->sb_uquotino != cpu_to_be64(mp->m_sb.sb_uquotino))
 218                 xchk_block_set_preen(sc, bp);
 219
 220         if (sb->sb_gquotino != cpu_to_be64(mp->m_sb.sb_gquotino))
 221                 xchk_block_set_preen(sc, bp);
 222
 223         /*
 224          * Skip the quota flags since repair will force quotacheck.
 225          * sb_qflags
 226          */
 227
 228         if (sb->sb_flags != mp->m_sb.sb_flags)
 229                 xchk_block_set_corrupt(sc, bp);
 230
 231         if (sb->sb_shared_vn != mp->m_sb.sb_shared_vn)
 232                 xchk_block_set_corrupt(sc, bp);
 233
 234         if (sb->sb_inoalignmt != cpu_to_be32(mp->m_sb.sb_inoalignmt))
 235                 xchk_block_set_corrupt(sc, bp);
 236
 237         if (sb->sb_unit != cpu_to_be32(mp->m_sb.sb_unit))
 238                 xchk_block_set_preen(sc, bp);
 239
 240         if (sb->sb_width != cpu_to_be32(mp->m_sb.sb_width))
 241                 xchk_block_set_preen(sc, bp);
 242
 243         if (sb->sb_dirblklog != mp->m_sb.sb_dirblklog)
 244                 xchk_block_set_corrupt(sc, bp);
 245
 246         if (sb->sb_logsectlog != mp->m_sb.sb_logsectlog)
 247                 xchk_block_set_corrupt(sc, bp);
 248
 249         if (sb->sb_logsectsize != cpu_to_be16(mp->m_sb.sb_logsectsize))
 250                 xchk_block_set_corrupt(sc, bp);
 251
 252         if (sb->sb_logsunit != cpu_to_be32(mp->m_sb.sb_logsunit))
 253                 xchk_block_set_corrupt(sc, bp);
 254
 255         /* Do we see any invalid bits in sb_features2? */
 256         if (!xfs_sb_version_hasmorebits(&mp->m_sb)) {
 257                 if (sb->sb_features2 != 0)
 258                         xchk_block_set_corrupt(sc, bp);
 259         } else {
 260                 v2_ok = XFS_SB_VERSION2_OKBITS;
 261                 if (xfs_sb_is_v5(&mp->m_sb))
 262                         v2_ok |= XFS_SB_VERSION2_CRCBIT;
 263
 264                 if (!!(sb->sb_features2 & cpu_to_be32(~v2_ok)))
 265                         xchk_block_set_corrupt(sc, bp);
 266
 267                 if (sb->sb_features2 != sb->sb_bad_features2)
 268                         xchk_block_set_preen(sc, bp);
 269         }
 270
 271         /* Check sb_features2 flags that are set at mkfs time. */
 272         features_mask = cpu_to_be32(XFS_SB_VERSION2_LAZYSBCOUNTBIT |
 273                                     XFS_SB_VERSION2_PROJID32BIT |
 274                                     XFS_SB_VERSION2_CRCBIT |
 275                                     XFS_SB_VERSION2_FTYPE);
 276         if ((sb->sb_features2 & features_mask) !=
 277             (cpu_to_be32(mp->m_sb.sb_features2) & features_mask))
 278                 xchk_block_set_corrupt(sc, bp);
 279
 280         /* Check sb_features2 flags that can be set after mkfs time. */
 281         features_mask = cpu_to_be32(XFS_SB_VERSION2_ATTR2BIT);
 282         if ((sb->sb_features2 & features_mask) !=
 283             (cpu_to_be32(mp->m_sb.sb_features2) & features_mask))
 284                 xchk_block_set_preen(sc, bp);
 285
 286         if (!xfs_has_crc(mp)) {
 287                 /* all v5 fields must be zero */
 288                 if (memchr_inv(&sb->sb_features_compat, 0,
 289                                 sizeof(struct xfs_dsb) -
 290                                 offsetof(struct xfs_dsb, sb_features_compat)))
 291                         xchk_block_set_corrupt(sc, bp);
 292         } else {
 293                 /* compat features must match */
 294                 if (sb->sb_features_compat !=
 295                                 cpu_to_be32(mp->m_sb.sb_features_compat))
 296                         xchk_block_set_corrupt(sc, bp);
 297
 298                 /* ro compat features must match */
 299                 if (sb->sb_features_ro_compat !=
 300                                 cpu_to_be32(mp->m_sb.sb_features_ro_compat))
 301                         xchk_block_set_corrupt(sc, bp);
 302
 303                 /*
 304                  * NEEDSREPAIR is ignored on a secondary super, so we should
 305                  * clear it when we find it, though it's not a corruption.
 306                  */
 307                 features_mask = cpu_to_be32(XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR);
 308                 if ((cpu_to_be32(mp->m_sb.sb_features_incompat) ^
 309                                 sb->sb_features_incompat) & features_mask)
 310                         xchk_block_set_preen(sc, bp);
 311
 312                 /* all other incompat features must match */
 313                 if ((cpu_to_be32(mp->m_sb.sb_features_incompat) ^
 314                                 sb->sb_features_incompat) & ~features_mask)
 315                         xchk_block_set_corrupt(sc, bp);
 316
 317                 /*
 318                  * log incompat features protect newer log record types from
 319                  * older log recovery code.  Log recovery doesn't check the
 320                  * secondary supers, so we can clear these if needed.
 321                  */
 322                 if (sb->sb_features_log_incompat)
 323                         xchk_block_set_preen(sc, bp);
 324
 325                 /* Don't care about sb_crc */
 326
 327                 if (sb->sb_spino_align != cpu_to_be32(mp->m_sb.sb_spino_align))
 328                         xchk_block_set_corrupt(sc, bp);
 329
 330                 if (sb->sb_pquotino != cpu_to_be64(mp->m_sb.sb_pquotino))
 331                         xchk_block_set_preen(sc, bp);
 332
 333                 /* Don't care about sb_lsn */
 334         }
 335
 336         if (xfs_has_metauuid(mp)) {
 337                 /* The metadata UUID must be the same for all supers */
 338                 if (!uuid_equal(&sb->sb_meta_uuid, &mp->m_sb.sb_meta_uuid))
 339                         xchk_block_set_corrupt(sc, bp);
 340         }
 341
 342         /* Everything else must be zero. */
 343         if (memchr_inv(sb + 1, 0,
 344                         BBTOB(bp->b_length) - sizeof(struct xfs_dsb)))
 345                 xchk_block_set_corrupt(sc, bp);
 346
 347         xchk_superblock_xref(sc, bp);
 348 out_pag:
 349         xfs_perag_put(pag);
 350         return error;
 351 }
 352
 353 /* AGF */
 354
 355 /* Tally freespace record lengths. */
 356 STATIC int
 357 xchk_agf_record_bno_lengths(
 358         struct xfs_btree_cur            *cur,
 359         const struct xfs_alloc_rec_incore *rec,
 360         void                            *priv)
 361 {
 362         xfs_extlen_t                    *blocks = priv;
 363
 364         (*blocks) += rec->ar_blockcount;
 365         return 0;
 366 }
 367
 368 /* Check agf_freeblks */
 369 static inline void
 370 xchk_agf_xref_freeblks(
 371         struct xfs_scrub        *sc)
 372 {
 373         struct xfs_agf          *agf = sc->sa.agf_bp->b_addr;
 374         xfs_extlen_t            blocks = 0;
 375         int                     error;
 376
 377         if (!sc->sa.bno_cur)
 378                 return;
 379
 380         error = xfs_alloc_query_all(sc->sa.bno_cur,
 381                         xchk_agf_record_bno_lengths, &blocks);
 382         if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
 383                 return;
 384         if (blocks != be32_to_cpu(agf->agf_freeblks))
 385                 xchk_block_xref_set_corrupt(sc, sc->sa.agf_bp);
 386 }
 387
 388 /* Cross reference the AGF with the cntbt (freespace by length btree) */
 389 static inline void
 390 xchk_agf_xref_cntbt(
 391         struct xfs_scrub        *sc)
 392 {
 393         struct xfs_agf          *agf = sc->sa.agf_bp->b_addr;
 394         xfs_agblock_t           agbno;
 395         xfs_extlen_t            blocks;
 396         int                     have;
 397         int                     error;
 398
 399         if (!sc->sa.cnt_cur)
 400                 return;
 401
 402         /* Any freespace at all? */
 403         error = xfs_alloc_lookup_le(sc->sa.cnt_cur, 0, -1U, &have);
 404         if (!xchk_should_check_xref(sc, &error, &sc->sa.cnt_cur))
 405                 return;
 406         if (!have) {
 407                 if (agf->agf_freeblks != cpu_to_be32(0))
 408                         xchk_block_xref_set_corrupt(sc, sc->sa.agf_bp);
 409                 return;
 410         }
 411
 412         /* Check agf_longest */
 413         error = xfs_alloc_get_rec(sc->sa.cnt_cur, &agbno, &blocks, &have);
 414         if (!xchk_should_check_xref(sc, &error, &sc->sa.cnt_cur))
 415                 return;
 416         if (!have || blocks != be32_to_cpu(agf->agf_longest))
 417                 xchk_block_xref_set_corrupt(sc, sc->sa.agf_bp);
 418 }
 419
 420 /* Check the btree block counts in the AGF against the btrees. */
 421 STATIC void
 422 xchk_agf_xref_btreeblks(
 423         struct xfs_scrub        *sc)
 424 {
 425         struct xfs_agf          *agf = sc->sa.agf_bp->b_addr;
 426         struct xfs_mount        *mp = sc->mp;
 427         xfs_agblock_t           blocks;
 428         xfs_agblock_t           btreeblks;
 429         int                     error;
 430
 431         /* agf_btreeblks didn't exist before lazysbcount */
 432         if (!xfs_has_lazysbcount(sc->mp))
 433                 return;
 434
 435         /* Check agf_rmap_blocks; set up for agf_btreeblks check */
 436         if (sc->sa.rmap_cur) {
 437                 error = xfs_btree_count_blocks(sc->sa.rmap_cur, &blocks);
 438                 if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
 439                         return;
 440                 btreeblks = blocks - 1;
 441                 if (blocks != be32_to_cpu(agf->agf_rmap_blocks))
 442                         xchk_block_xref_set_corrupt(sc, sc->sa.agf_bp);
 443         } else {
 444                 btreeblks = 0;
 445         }
 446
 447         /*
 448          * No rmap cursor; we can't xref if we have the rmapbt feature.
 449          * We also can't do it if we're missing the free space btree cursors.
 450          */
 451         if ((xfs_has_rmapbt(mp) && !sc->sa.rmap_cur) ||
 452             !sc->sa.bno_cur || !sc->sa.cnt_cur)
 453                 return;
 454
 455         /* Check agf_btreeblks */
 456         error = xfs_btree_count_blocks(sc->sa.bno_cur, &blocks);
 457         if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
 458                 return;
 459         btreeblks += blocks - 1;
 460
 461         error = xfs_btree_count_blocks(sc->sa.cnt_cur, &blocks);
 462         if (!xchk_should_check_xref(sc, &error, &sc->sa.cnt_cur))
 463                 return;
 464         btreeblks += blocks - 1;
 465
 466         if (btreeblks != be32_to_cpu(agf->agf_btreeblks))
 467                 xchk_block_xref_set_corrupt(sc, sc->sa.agf_bp);
 468 }
 469
 470 /* Check agf_refcount_blocks against tree size */
 471 static inline void
 472 xchk_agf_xref_refcblks(
 473         struct xfs_scrub        *sc)
 474 {
 475         struct xfs_agf          *agf = sc->sa.agf_bp->b_addr;
 476         xfs_agblock_t           blocks;
 477         int                     error;
 478
 479         if (!sc->sa.refc_cur)
 480                 return;
 481
 482         error = xfs_btree_count_blocks(sc->sa.refc_cur, &blocks);
 483         if (!xchk_should_check_xref(sc, &error, &sc->sa.refc_cur))
 484                 return;
 485         if (blocks != be32_to_cpu(agf->agf_refcount_blocks))
 486                 xchk_block_xref_set_corrupt(sc, sc->sa.agf_bp);
 487 }
 488
 489 /* Cross-reference with the other btrees. */
 490 STATIC void
 491 xchk_agf_xref(
 492         struct xfs_scrub        *sc)
 493 {
 494         struct xfs_mount        *mp = sc->mp;
 495         xfs_agblock_t           agbno;
 496
 497         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 498                 return;
 499
 500         agbno = XFS_AGF_BLOCK(mp);
 501
 502         xchk_ag_btcur_init(sc, &sc->sa);
 503
 504         xchk_xref_is_used_space(sc, agbno, 1);
 505         xchk_agf_xref_freeblks(sc);
 506         xchk_agf_xref_cntbt(sc);
 507         xchk_xref_is_not_inode_chunk(sc, agbno, 1);
 508         xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_FS);
 509         xchk_agf_xref_btreeblks(sc);
 510         xchk_xref_is_not_shared(sc, agbno, 1);
 511         xchk_agf_xref_refcblks(sc);
 512
 513         /* scrub teardown will take care of sc->sa for us */
 514 }
 515
 516 /* Scrub the AGF. */
 517 int
 518 xchk_agf(
 519         struct xfs_scrub        *sc)
 520 {
 521         struct xfs_mount        *mp = sc->mp;
 522         struct xfs_agf          *agf;
 523         struct xfs_perag        *pag;
 524         xfs_agnumber_t          agno = sc->sm->sm_agno;
 525         xfs_agblock_t           agbno;
 526         xfs_agblock_t           eoag;
 527         xfs_agblock_t           agfl_first;
 528         xfs_agblock_t           agfl_last;
 529         xfs_agblock_t           agfl_count;
 530         xfs_agblock_t           fl_count;
 531         int                     level;
 532         int                     error = 0;
 533
 534         error = xchk_ag_read_headers(sc, agno, &sc->sa);
 535         if (!xchk_process_error(sc, agno, XFS_AGF_BLOCK(sc->mp), &error))
 536                 goto out;
 537         xchk_buffer_recheck(sc, sc->sa.agf_bp);
 538
 539         agf = sc->sa.agf_bp->b_addr;
 540         pag = sc->sa.pag;
 541
 542         /* Check the AG length */
 543         eoag = be32_to_cpu(agf->agf_length);
 544         if (eoag != pag->block_count)
 545                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 546
 547         /* Check the AGF btree roots and levels */
 548         agbno = be32_to_cpu(agf->agf_roots[XFS_BTNUM_BNO]);
 549         if (!xfs_verify_agbno(pag, agbno))
 550                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 551
 552         agbno = be32_to_cpu(agf->agf_roots[XFS_BTNUM_CNT]);
 553         if (!xfs_verify_agbno(pag, agbno))
 554                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 555
 556         level = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]);
 557         if (level <= 0 || level > mp->m_alloc_maxlevels)
 558                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 559
 560         level = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
 561         if (level <= 0 || level > mp->m_alloc_maxlevels)
 562                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 563
 564         if (xfs_has_rmapbt(mp)) {
 565                 agbno = be32_to_cpu(agf->agf_roots[XFS_BTNUM_RMAP]);
 566                 if (!xfs_verify_agbno(pag, agbno))
 567                         xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 568
 569                 level = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]);
 570                 if (level <= 0 || level > mp->m_rmap_maxlevels)
 571                         xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 572         }
 573
 574         if (xfs_has_reflink(mp)) {
 575                 agbno = be32_to_cpu(agf->agf_refcount_root);
 576                 if (!xfs_verify_agbno(pag, agbno))
 577                         xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 578
 579                 level = be32_to_cpu(agf->agf_refcount_level);
 580                 if (level <= 0 || level > mp->m_refc_maxlevels)
 581                         xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 582         }
 583
 584         /* Check the AGFL counters */
 585         agfl_first = be32_to_cpu(agf->agf_flfirst);
 586         agfl_last = be32_to_cpu(agf->agf_fllast);
 587         agfl_count = be32_to_cpu(agf->agf_flcount);
 588         if (agfl_last > agfl_first)
 589                 fl_count = agfl_last - agfl_first + 1;
 590         else
 591                 fl_count = xfs_agfl_size(mp) - agfl_first + agfl_last + 1;
 592         if (agfl_count != 0 && fl_count != agfl_count)
 593                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 594
 595         /* Do the incore counters match? */
 596         if (pag->pagf_freeblks != be32_to_cpu(agf->agf_freeblks))
 597                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 598         if (pag->pagf_flcount != be32_to_cpu(agf->agf_flcount))
 599                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 600         if (xfs_has_lazysbcount(sc->mp) &&
 601             pag->pagf_btreeblks != be32_to_cpu(agf->agf_btreeblks))
 602                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 603
 604         xchk_agf_xref(sc);
 605 out:
 606         return error;
 607 }
 608
 609 /* AGFL */
 610
 611 struct xchk_agfl_info {
 612         unsigned int            sz_entries;
 613         unsigned int            nr_entries;
 614         xfs_agblock_t           *entries;
 615         struct xfs_scrub        *sc;
 616 };
 617
 618 /* Cross-reference with the other btrees. */
 619 STATIC void
 620 xchk_agfl_block_xref(
 621         struct xfs_scrub        *sc,
 622         xfs_agblock_t           agbno)
 623 {
 624         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 625                 return;
 626
 627         xchk_xref_is_used_space(sc, agbno, 1);
 628         xchk_xref_is_not_inode_chunk(sc, agbno, 1);
 629         xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_AG);
 630         xchk_xref_is_not_shared(sc, agbno, 1);
 631 }
 632
 633 /* Scrub an AGFL block. */
 634 STATIC int
 635 xchk_agfl_block(
 636         struct xfs_mount        *mp,
 637         xfs_agblock_t           agbno,
 638         void                    *priv)
 639 {
 640         struct xchk_agfl_info   *sai = priv;
 641         struct xfs_scrub        *sc = sai->sc;
 642
 643         if (xfs_verify_agbno(sc->sa.pag, agbno) &&
 644             sai->nr_entries < sai->sz_entries)
 645                 sai->entries[sai->nr_entries++] = agbno;
 646         else
 647                 xchk_block_set_corrupt(sc, sc->sa.agfl_bp);
 648
 649         xchk_agfl_block_xref(sc, agbno);
 650
 651         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 652                 return -ECANCELED;
 653
 654         return 0;
 655 }
 656
 657 static int
 658 xchk_agblock_cmp(
 659         const void              *pa,
 660         const void              *pb)
 661 {
 662         const xfs_agblock_t     *a = pa;
 663         const xfs_agblock_t     *b = pb;
 664
 665         return (int)*a - (int)*b;
 666 }
 667
 668 /* Cross-reference with the other btrees. */
 669 STATIC void
 670 xchk_agfl_xref(
 671         struct xfs_scrub        *sc)
 672 {
 673         struct xfs_mount        *mp = sc->mp;
 674         xfs_agblock_t           agbno;
 675
 676         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 677                 return;
 678
 679         agbno = XFS_AGFL_BLOCK(mp);
 680
 681         xchk_ag_btcur_init(sc, &sc->sa);
 682
 683         xchk_xref_is_used_space(sc, agbno, 1);
 684         xchk_xref_is_not_inode_chunk(sc, agbno, 1);
 685         xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_FS);
 686         xchk_xref_is_not_shared(sc, agbno, 1);
 687
 688         /*
 689          * Scrub teardown will take care of sc->sa for us.  Leave sc->sa
 690          * active so that the agfl block xref can use it too.
 691          */
 692 }
 693
 694 /* Scrub the AGFL. */
 695 int
 696 xchk_agfl(
 697         struct xfs_scrub        *sc)
 698 {
 699         struct xchk_agfl_info   sai;
 700         struct xfs_agf          *agf;
 701         xfs_agnumber_t          agno = sc->sm->sm_agno;
 702         unsigned int            agflcount;
 703         unsigned int            i;
 704         int                     error;
 705
 706         error = xchk_ag_read_headers(sc, agno, &sc->sa);
 707         if (!xchk_process_error(sc, agno, XFS_AGFL_BLOCK(sc->mp), &error))
 708                 goto out;
 709         if (!sc->sa.agf_bp)
 710                 return -EFSCORRUPTED;
 711         xchk_buffer_recheck(sc, sc->sa.agfl_bp);
 712
 713         xchk_agfl_xref(sc);
 714
 715         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 716                 goto out;
 717
 718         /* Allocate buffer to ensure uniqueness of AGFL entries. */
 719         agf = sc->sa.agf_bp->b_addr;
 720         agflcount = be32_to_cpu(agf->agf_flcount);
 721         if (agflcount > xfs_agfl_size(sc->mp)) {
 722                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 723                 goto out;
 724         }
 725         memset(&sai, 0, sizeof(sai));
 726         sai.sc = sc;
 727         sai.sz_entries = agflcount;
 728         sai.entries = kmem_zalloc(sizeof(xfs_agblock_t) * agflcount,
 729                         KM_MAYFAIL);
 730         if (!sai.entries) {
 731                 error = -ENOMEM;
 732                 goto out;
 733         }
 734
 735         /* Check the blocks in the AGFL. */
 736         error = xfs_agfl_walk(sc->mp, sc->sa.agf_bp->b_addr,
 737                         sc->sa.agfl_bp, xchk_agfl_block, &sai);
 738         if (error == -ECANCELED) {
 739                 error = 0;
 740                 goto out_free;
 741         }
 742         if (error)
 743                 goto out_free;
 744
 745         if (agflcount != sai.nr_entries) {
 746                 xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 747                 goto out_free;
 748         }
 749
 750         /* Sort entries, check for duplicates. */
 751         sort(sai.entries, sai.nr_entries, sizeof(sai.entries[0]),
 752                         xchk_agblock_cmp, NULL);
 753         for (i = 1; i < sai.nr_entries; i++) {
 754                 if (sai.entries[i] == sai.entries[i - 1]) {
 755                         xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 756                         break;
 757                 }
 758         }
 759
 760 out_free:
 761         kmem_free(sai.entries);
 762 out:
 763         return error;
 764 }
 765
 766 /* AGI */
 767
 768 /* Check agi_count/agi_freecount */
 769 static inline void
 770 xchk_agi_xref_icounts(
 771         struct xfs_scrub        *sc)
 772 {
 773         struct xfs_agi          *agi = sc->sa.agi_bp->b_addr;
 774         xfs_agino_t             icount;
 775         xfs_agino_t             freecount;
 776         int                     error;
 777
 778         if (!sc->sa.ino_cur)
 779                 return;
 780
 781         error = xfs_ialloc_count_inodes(sc->sa.ino_cur, &icount, &freecount);
 782         if (!xchk_should_check_xref(sc, &error, &sc->sa.ino_cur))
 783                 return;
 784         if (be32_to_cpu(agi->agi_count) != icount ||
 785             be32_to_cpu(agi->agi_freecount) != freecount)
 786                 xchk_block_xref_set_corrupt(sc, sc->sa.agi_bp);
 787 }
 788
 789 /* Check agi_[fi]blocks against tree size */
 790 static inline void
 791 xchk_agi_xref_fiblocks(
 792         struct xfs_scrub        *sc)
 793 {
 794         struct xfs_agi          *agi = sc->sa.agi_bp->b_addr;
 795         xfs_agblock_t           blocks;
 796         int                     error = 0;
 797
 798         if (!xfs_has_inobtcounts(sc->mp))
 799                 return;
 800
 801         if (sc->sa.ino_cur) {
 802                 error = xfs_btree_count_blocks(sc->sa.ino_cur, &blocks);
 803                 if (!xchk_should_check_xref(sc, &error, &sc->sa.ino_cur))
 804                         return;
 805                 if (blocks != be32_to_cpu(agi->agi_iblocks))
 806                         xchk_block_xref_set_corrupt(sc, sc->sa.agi_bp);
 807         }
 808
 809         if (sc->sa.fino_cur) {
 810                 error = xfs_btree_count_blocks(sc->sa.fino_cur, &blocks);
 811                 if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur))
 812                         return;
 813                 if (blocks != be32_to_cpu(agi->agi_fblocks))
 814                         xchk_block_xref_set_corrupt(sc, sc->sa.agi_bp);
 815         }
 816 }
 817
 818 /* Cross-reference with the other btrees. */
 819 STATIC void
 820 xchk_agi_xref(
 821         struct xfs_scrub        *sc)
 822 {
 823         struct xfs_mount        *mp = sc->mp;
 824         xfs_agblock_t           agbno;
 825
 826         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 827                 return;
 828
 829         agbno = XFS_AGI_BLOCK(mp);
 830
 831         xchk_ag_btcur_init(sc, &sc->sa);
 832
 833         xchk_xref_is_used_space(sc, agbno, 1);
 834         xchk_xref_is_not_inode_chunk(sc, agbno, 1);
 835         xchk_agi_xref_icounts(sc);
 836         xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_FS);
 837         xchk_xref_is_not_shared(sc, agbno, 1);
 838         xchk_agi_xref_fiblocks(sc);
 839
 840         /* scrub teardown will take care of sc->sa for us */
 841 }
 842
 843 /* Scrub the AGI. */
 844 int
 845 xchk_agi(
 846         struct xfs_scrub        *sc)
 847 {
 848         struct xfs_mount        *mp = sc->mp;
 849         struct xfs_agi          *agi;
 850         struct xfs_perag        *pag;
 851         struct xfs_ino_geometry *igeo = M_IGEO(sc->mp);
 852         xfs_agnumber_t          agno = sc->sm->sm_agno;
 853         xfs_agblock_t           agbno;
 854         xfs_agblock_t           eoag;
 855         xfs_agino_t             agino;
 856         xfs_agino_t             first_agino;
 857         xfs_agino_t             last_agino;
 858         xfs_agino_t             icount;
 859         int                     i;
 860         int                     level;
 861         int                     error = 0;
 862
 863         error = xchk_ag_read_headers(sc, agno, &sc->sa);
 864         if (!xchk_process_error(sc, agno, XFS_AGI_BLOCK(sc->mp), &error))
 865                 goto out;
 866         xchk_buffer_recheck(sc, sc->sa.agi_bp);
 867
 868         agi = sc->sa.agi_bp->b_addr;
 869         pag = sc->sa.pag;
 870
 871         /* Check the AG length */
 872         eoag = be32_to_cpu(agi->agi_length);
 873         if (eoag != pag->block_count)
 874                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 875
 876         /* Check btree roots and levels */
 877         agbno = be32_to_cpu(agi->agi_root);
 878         if (!xfs_verify_agbno(pag, agbno))
 879                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 880
 881         level = be32_to_cpu(agi->agi_level);
 882         if (level <= 0 || level > igeo->inobt_maxlevels)
 883                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 884
 885         if (xfs_has_finobt(mp)) {
 886                 agbno = be32_to_cpu(agi->agi_free_root);
 887                 if (!xfs_verify_agbno(pag, agbno))
 888                         xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 889
 890                 level = be32_to_cpu(agi->agi_free_level);
 891                 if (level <= 0 || level > igeo->inobt_maxlevels)
 892                         xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 893         }
 894
 895         /* Check inode counters */
 896         xfs_agino_range(mp, agno, &first_agino, &last_agino);
 897         icount = be32_to_cpu(agi->agi_count);
 898         if (icount > last_agino - first_agino + 1 ||
 899             icount < be32_to_cpu(agi->agi_freecount))
 900                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 901
 902         /* Check inode pointers */
 903         agino = be32_to_cpu(agi->agi_newino);
 904         if (!xfs_verify_agino_or_null(pag, agino))
 905                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 906
 907         agino = be32_to_cpu(agi->agi_dirino);
 908         if (!xfs_verify_agino_or_null(pag, agino))
 909                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 910
 911         /* Check unlinked inode buckets */
 912         for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++) {
 913                 agino = be32_to_cpu(agi->agi_unlinked[i]);
 914                 if (!xfs_verify_agino_or_null(pag, agino))
 915                         xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 916         }
 917
 918         if (agi->agi_pad32 != cpu_to_be32(0))
 919                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 920
 921         /* Do the incore counters match? */
 922         if (pag->pagi_count != be32_to_cpu(agi->agi_count))
 923                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 924         if (pag->pagi_freecount != be32_to_cpu(agi->agi_freecount))
 925                 xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 926
 927         xchk_agi_xref(sc);
 928 out:
 929         return error;
 930 }