fs/xfs/scrub/scrub.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_log_format.h"
  13 #include "xfs_trans.h"
  14 #include "xfs_inode.h"
  15 #include "xfs_quota.h"
  16 #include "xfs_qm.h"
  17 #include "xfs_errortag.h"
  18 #include "xfs_error.h"
  19 #include "xfs_scrub.h"
  20 #include "scrub/scrub.h"
  21 #include "scrub/common.h"
  22 #include "scrub/trace.h"
  23 #include "scrub/repair.h"
  24 #include "scrub/health.h"
  25
  26 /*
  27  * Online Scrub and Repair
  28  *
  29  * Traditionally, XFS (the kernel driver) did not know how to check or
  30  * repair on-disk data structures.  That task was left to the xfs_check
  31  * and xfs_repair tools, both of which require taking the filesystem
  32  * offline for a thorough but time consuming examination.  Online
  33  * scrub & repair, on the other hand, enables us to check the metadata
  34  * for obvious errors while carefully stepping around the filesystem's
  35  * ongoing operations, locking rules, etc.
  36  *
  37  * Given that most XFS metadata consist of records stored in a btree,
  38  * most of the checking functions iterate the btree blocks themselves
  39  * looking for irregularities.  When a record block is encountered, each
  40  * record can be checked for obviously bad values.  Record values can
  41  * also be cross-referenced against other btrees to look for potential
  42  * misunderstandings between pieces of metadata.
  43  *
  44  * It is expected that the checkers responsible for per-AG metadata
  45  * structures will lock the AG headers (AGI, AGF, AGFL), iterate the
  46  * metadata structure, and perform any relevant cross-referencing before
  47  * unlocking the AG and returning the results to userspace.  These
  48  * scrubbers must not keep an AG locked for too long to avoid tying up
  49  * the block and inode allocators.
  50  *
  51  * Block maps and b-trees rooted in an inode present a special challenge
  52  * because they can involve extents from any AG.  The general scrubber
  53  * structure of lock -> check -> xref -> unlock still holds, but AG
  54  * locking order rules /must/ be obeyed to avoid deadlocks.  The
  55  * ordering rule, of course, is that we must lock in increasing AG
  56  * order.  Helper functions are provided to track which AG headers we've
  57  * already locked.  If we detect an imminent locking order violation, we
  58  * can signal a potential deadlock, in which case the scrubber can jump
  59  * out to the top level, lock all the AGs in order, and retry the scrub.
  60  *
  61  * For file data (directories, extended attributes, symlinks) scrub, we
  62  * can simply lock the inode and walk the data.  For btree data
  63  * (directories and attributes) we follow the same btree-scrubbing
  64  * strategy outlined previously to check the records.
  65  *
  66  * We use a bit of trickery with transactions to avoid buffer deadlocks
  67  * if there is a cycle in the metadata.  The basic problem is that
  68  * travelling down a btree involves locking the current buffer at each
  69  * tree level.  If a pointer should somehow point back to a buffer that
  70  * we've already examined, we will deadlock due to the second buffer
  71  * locking attempt.  Note however that grabbing a buffer in transaction
  72  * context links the locked buffer to the transaction.  If we try to
  73  * re-grab the buffer in the context of the same transaction, we avoid
  74  * the second lock attempt and continue.  Between the verifier and the
  75  * scrubber, something will notice that something is amiss and report
  76  * the corruption.  Therefore, each scrubber will allocate an empty
  77  * transaction, attach buffers to it, and cancel the transaction at the
  78  * end of the scrub run.  Cancelling a non-dirty transaction simply
  79  * unlocks the buffers.
  80  *
  81  * There are four pieces of data that scrub can communicate to
  82  * userspace.  The first is the error code (errno), which can be used to
  83  * communicate operational errors in performing the scrub.  There are
  84  * also three flags that can be set in the scrub context.  If the data
  85  * structure itself is corrupt, the CORRUPT flag will be set.  If
  86  * the metadata is correct but otherwise suboptimal, the PREEN flag
  87  * will be set.
  88  *
  89  * We perform secondary validation of filesystem metadata by
  90  * cross-referencing every record with all other available metadata.
  91  * For example, for block mapping extents, we verify that there are no
  92  * records in the free space and inode btrees corresponding to that
  93  * space extent and that there is a corresponding entry in the reverse
  94  * mapping btree.  Inconsistent metadata is noted by setting the
  95  * XCORRUPT flag; btree query function errors are noted by setting the
  96  * XFAIL flag and deleting the cursor to prevent further attempts to
  97  * cross-reference with a defective btree.
  98  *
  99  * If a piece of metadata proves corrupt or suboptimal, the userspace
 100  * program can ask the kernel to apply some tender loving care (TLC) to
 101  * the metadata object by setting the REPAIR flag and re-calling the
 102  * scrub ioctl.  "Corruption" is defined by metadata violating the
 103  * on-disk specification; operations cannot continue if the violation is
 104  * left untreated.  It is possible for XFS to continue if an object is
 105  * "suboptimal", however performance may be degraded.  Repairs are
 106  * usually performed by rebuilding the metadata entirely out of
 107  * redundant metadata.  Optimizing, on the other hand, can sometimes be
 108  * done without rebuilding entire structures.
 109  *
 110  * Generally speaking, the repair code has the following code structure:
 111  * Lock -> scrub -> repair -> commit -> re-lock -> re-scrub -> unlock.
 112  * The first check helps us figure out if we need to rebuild or simply
 113  * optimize the structure so that the rebuild knows what to do.  The
 114  * second check evaluates the completeness of the repair; that is what
 115  * is reported to userspace.
 116  *
 117  * A quick note on symbol prefixes:
 118  * - "xfs_" are general XFS symbols.
 119  * - "xchk_" are symbols related to metadata checking.
 120  * - "xrep_" are symbols related to metadata repair.
 121  * - "xfs_scrub_" are symbols that tie online fsck to the rest of XFS.
 122  */
 123
 124 /*
 125  * Scrub probe -- userspace uses this to probe if we're willing to scrub
 126  * or repair a given mountpoint.  This will be used by xfs_scrub to
 127  * probe the kernel's abilities to scrub (and repair) the metadata.  We
 128  * do this by validating the ioctl inputs from userspace, preparing the
 129  * filesystem for a scrub (or a repair) operation, and immediately
 130  * returning to userspace.  Userspace can use the returned errno and
 131  * structure state to decide (in broad terms) if scrub/repair are
 132  * supported by the running kernel.
 133  */
 134 static int
 135 xchk_probe(
 136         struct xfs_scrub        *sc)
 137 {
 138         int                     error = 0;
 139
 140         if (xchk_should_terminate(sc, &error))
 141                 return error;
 142
 143         return 0;
 144 }
 145
 146 /* Scrub setup and teardown */
 147
 148 /* Free all the resources and finish the transactions. */
 149 STATIC int
 150 xchk_teardown(
 151         struct xfs_scrub        *sc,
 152         struct xfs_inode        *ip_in,
 153         int                     error)
 154 {
 155         xchk_ag_free(sc, &sc->sa);
 156         if (sc->tp) {
 157                 if (error == 0 && (sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR))
 158                         error = xfs_trans_commit(sc->tp);
 159                 else
 160                         xfs_trans_cancel(sc->tp);
 161                 sc->tp = NULL;
 162         }
 163         if (sc->ip) {
 164                 if (sc->ilock_flags)
 165                         xfs_iunlock(sc->ip, sc->ilock_flags);
 166                 if (sc->ip != ip_in &&
 167                     !xfs_internal_inum(sc->mp, sc->ip->i_ino))
 168                         xfs_irele(sc->ip);
 169                 sc->ip = NULL;
 170         }
 171         sb_end_write(sc->mp->m_super);
 172         if (sc->flags & XCHK_REAPING_DISABLED)
 173                 xchk_start_reaping(sc);
 174         if (sc->flags & XCHK_HAS_QUOTAOFFLOCK) {
 175                 mutex_unlock(&sc->mp->m_quotainfo->qi_quotaofflock);
 176                 sc->flags &= ~XCHK_HAS_QUOTAOFFLOCK;
 177         }
 178         if (sc->buf) {
 179                 kmem_free(sc->buf);
 180                 sc->buf = NULL;
 181         }
 182         return error;
 183 }
 184
 185 /* Scrubbing dispatch. */
 186
 187 static const struct xchk_meta_ops meta_scrub_ops[] = {
 188         [XFS_SCRUB_TYPE_PROBE] = {      /* ioctl presence test */
 189                 .type   = ST_NONE,
 190                 .setup  = xchk_setup_fs,
 191                 .scrub  = xchk_probe,
 192                 .repair = xrep_probe,
 193         },
 194         [XFS_SCRUB_TYPE_SB] = {         /* superblock */
 195                 .type   = ST_PERAG,
 196                 .setup  = xchk_setup_fs,
 197                 .scrub  = xchk_superblock,
 198                 .repair = xrep_superblock,
 199         },
 200         [XFS_SCRUB_TYPE_AGF] = {        /* agf */
 201                 .type   = ST_PERAG,
 202                 .setup  = xchk_setup_fs,
 203                 .scrub  = xchk_agf,
 204                 .repair = xrep_agf,
 205         },
 206         [XFS_SCRUB_TYPE_AGFL]= {        /* agfl */
 207                 .type   = ST_PERAG,
 208                 .setup  = xchk_setup_fs,
 209                 .scrub  = xchk_agfl,
 210                 .repair = xrep_agfl,
 211         },
 212         [XFS_SCRUB_TYPE_AGI] = {        /* agi */
 213                 .type   = ST_PERAG,
 214                 .setup  = xchk_setup_fs,
 215                 .scrub  = xchk_agi,
 216                 .repair = xrep_agi,
 217         },
 218         [XFS_SCRUB_TYPE_BNOBT] = {      /* bnobt */
 219                 .type   = ST_PERAG,
 220                 .setup  = xchk_setup_ag_allocbt,
 221                 .scrub  = xchk_bnobt,
 222                 .repair = xrep_notsupported,
 223         },
 224         [XFS_SCRUB_TYPE_CNTBT] = {      /* cntbt */
 225                 .type   = ST_PERAG,
 226                 .setup  = xchk_setup_ag_allocbt,
 227                 .scrub  = xchk_cntbt,
 228                 .repair = xrep_notsupported,
 229         },
 230         [XFS_SCRUB_TYPE_INOBT] = {      /* inobt */
 231                 .type   = ST_PERAG,
 232                 .setup  = xchk_setup_ag_iallocbt,
 233                 .scrub  = xchk_inobt,
 234                 .repair = xrep_notsupported,
 235         },
 236         [XFS_SCRUB_TYPE_FINOBT] = {     /* finobt */
 237                 .type   = ST_PERAG,
 238                 .setup  = xchk_setup_ag_iallocbt,
 239                 .scrub  = xchk_finobt,
 240                 .has    = xfs_sb_version_hasfinobt,
 241                 .repair = xrep_notsupported,
 242         },
 243         [XFS_SCRUB_TYPE_RMAPBT] = {     /* rmapbt */
 244                 .type   = ST_PERAG,
 245                 .setup  = xchk_setup_ag_rmapbt,
 246                 .scrub  = xchk_rmapbt,
 247                 .has    = xfs_sb_version_hasrmapbt,
 248                 .repair = xrep_notsupported,
 249         },
 250         [XFS_SCRUB_TYPE_REFCNTBT] = {   /* refcountbt */
 251                 .type   = ST_PERAG,
 252                 .setup  = xchk_setup_ag_refcountbt,
 253                 .scrub  = xchk_refcountbt,
 254                 .has    = xfs_sb_version_hasreflink,
 255                 .repair = xrep_notsupported,
 256         },
 257         [XFS_SCRUB_TYPE_INODE] = {      /* inode record */
 258                 .type   = ST_INODE,
 259                 .setup  = xchk_setup_inode,
 260                 .scrub  = xchk_inode,
 261                 .repair = xrep_notsupported,
 262         },
 263         [XFS_SCRUB_TYPE_BMBTD] = {      /* inode data fork */
 264                 .type   = ST_INODE,
 265                 .setup  = xchk_setup_inode_bmap,
 266                 .scrub  = xchk_bmap_data,
 267                 .repair = xrep_notsupported,
 268         },
 269         [XFS_SCRUB_TYPE_BMBTA] = {      /* inode attr fork */
 270                 .type   = ST_INODE,
 271                 .setup  = xchk_setup_inode_bmap,
 272                 .scrub  = xchk_bmap_attr,
 273                 .repair = xrep_notsupported,
 274         },
 275         [XFS_SCRUB_TYPE_BMBTC] = {      /* inode CoW fork */
 276                 .type   = ST_INODE,
 277                 .setup  = xchk_setup_inode_bmap,
 278                 .scrub  = xchk_bmap_cow,
 279                 .repair = xrep_notsupported,
 280         },
 281         [XFS_SCRUB_TYPE_DIR] = {        /* directory */
 282                 .type   = ST_INODE,
 283                 .setup  = xchk_setup_directory,
 284                 .scrub  = xchk_directory,
 285                 .repair = xrep_notsupported,
 286         },
 287         [XFS_SCRUB_TYPE_XATTR] = {      /* extended attributes */
 288                 .type   = ST_INODE,
 289                 .setup  = xchk_setup_xattr,
 290                 .scrub  = xchk_xattr,
 291                 .repair = xrep_notsupported,
 292         },
 293         [XFS_SCRUB_TYPE_SYMLINK] = {    /* symbolic link */
 294                 .type   = ST_INODE,
 295                 .setup  = xchk_setup_symlink,
 296                 .scrub  = xchk_symlink,
 297                 .repair = xrep_notsupported,
 298         },
 299         [XFS_SCRUB_TYPE_PARENT] = {     /* parent pointers */
 300                 .type   = ST_INODE,
 301                 .setup  = xchk_setup_parent,
 302                 .scrub  = xchk_parent,
 303                 .repair = xrep_notsupported,
 304         },
 305         [XFS_SCRUB_TYPE_RTBITMAP] = {   /* realtime bitmap */
 306                 .type   = ST_FS,
 307                 .setup  = xchk_setup_rt,
 308                 .scrub  = xchk_rtbitmap,
 309                 .has    = xfs_sb_version_hasrealtime,
 310                 .repair = xrep_notsupported,
 311         },
 312         [XFS_SCRUB_TYPE_RTSUM] = {      /* realtime summary */
 313                 .type   = ST_FS,
 314                 .setup  = xchk_setup_rt,
 315                 .scrub  = xchk_rtsummary,
 316                 .has    = xfs_sb_version_hasrealtime,
 317                 .repair = xrep_notsupported,
 318         },
 319         [XFS_SCRUB_TYPE_UQUOTA] = {     /* user quota */
 320                 .type   = ST_FS,
 321                 .setup  = xchk_setup_quota,
 322                 .scrub  = xchk_quota,
 323                 .repair = xrep_notsupported,
 324         },
 325         [XFS_SCRUB_TYPE_GQUOTA] = {     /* group quota */
 326                 .type   = ST_FS,
 327                 .setup  = xchk_setup_quota,
 328                 .scrub  = xchk_quota,
 329                 .repair = xrep_notsupported,
 330         },
 331         [XFS_SCRUB_TYPE_PQUOTA] = {     /* project quota */
 332                 .type   = ST_FS,
 333                 .setup  = xchk_setup_quota,
 334                 .scrub  = xchk_quota,
 335                 .repair = xrep_notsupported,
 336         },
 337         [XFS_SCRUB_TYPE_FSCOUNTERS] = { /* fs summary counters */
 338                 .type   = ST_FS,
 339                 .setup  = xchk_setup_fscounters,
 340                 .scrub  = xchk_fscounters,
 341                 .repair = xrep_notsupported,
 342         },
 343 };
 344
 345 /* This isn't a stable feature, warn once per day. */
 346 static inline void
 347 xchk_experimental_warning(
 348         struct xfs_mount        *mp)
 349 {
 350         static struct ratelimit_state scrub_warning = RATELIMIT_STATE_INIT(
 351                         "xchk_warning", 86400 * HZ, 1);
 352         ratelimit_set_flags(&scrub_warning, RATELIMIT_MSG_ON_RELEASE);
 353
 354         if (__ratelimit(&scrub_warning))
 355                 xfs_alert(mp,
 356 "EXPERIMENTAL online scrub feature in use. Use at your own risk!");
 357 }
 358
 359 static int
 360 xchk_validate_inputs(
 361         struct xfs_mount                *mp,
 362         struct xfs_scrub_metadata       *sm)
 363 {
 364         int                             error;
 365         const struct xchk_meta_ops      *ops;
 366
 367         error = -EINVAL;
 368         /* Check our inputs. */
 369         sm->sm_flags &= ~XFS_SCRUB_FLAGS_OUT;
 370         if (sm->sm_flags & ~XFS_SCRUB_FLAGS_IN)
 371                 goto out;
 372         /* sm_reserved[] must be zero */
 373         if (memchr_inv(sm->sm_reserved, 0, sizeof(sm->sm_reserved)))
 374                 goto out;
 375
 376         error = -ENOENT;
 377         /* Do we know about this type of metadata? */
 378         if (sm->sm_type >= XFS_SCRUB_TYPE_NR)
 379                 goto out;
 380         ops = &meta_scrub_ops[sm->sm_type];
 381         if (ops->setup == NULL || ops->scrub == NULL)
 382                 goto out;
 383         /* Does this fs even support this type of metadata? */
 384         if (ops->has && !ops->has(&mp->m_sb))
 385                 goto out;
 386
 387         error = -EINVAL;
 388         /* restricting fields must be appropriate for type */
 389         switch (ops->type) {
 390         case ST_NONE:
 391         case ST_FS:
 392                 if (sm->sm_ino || sm->sm_gen || sm->sm_agno)
 393                         goto out;
 394                 break;
 395         case ST_PERAG:
 396                 if (sm->sm_ino || sm->sm_gen ||
 397                     sm->sm_agno >= mp->m_sb.sb_agcount)
 398                         goto out;
 399                 break;
 400         case ST_INODE:
 401                 if (sm->sm_agno || (sm->sm_gen && !sm->sm_ino))
 402                         goto out;
 403                 break;
 404         default:
 405                 goto out;
 406         }
 407
 408         /*
 409          * We only want to repair read-write v5+ filesystems.  Defer the check
 410          * for ops->repair until after our scrub confirms that we need to
 411          * perform repairs so that we avoid failing due to not supporting
 412          * repairing an object that doesn't need repairs.
 413          */
 414         if (sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) {
 415                 error = -EOPNOTSUPP;
 416                 if (!xfs_sb_version_hascrc(&mp->m_sb))
 417                         goto out;
 418
 419                 error = -EROFS;
 420                 if (mp->m_flags & XFS_MOUNT_RDONLY)
 421                         goto out;
 422         }
 423
 424         error = 0;
 425 out:
 426         return error;
 427 }
 428
 429 #ifdef CONFIG_XFS_ONLINE_REPAIR
 430 static inline void xchk_postmortem(struct xfs_scrub *sc)
 431 {
 432         /*
 433          * Userspace asked us to repair something, we repaired it, rescanned
 434          * it, and the rescan says it's still broken.  Scream about this in
 435          * the system logs.
 436          */
 437         if ((sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) &&
 438             (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
 439                                  XFS_SCRUB_OFLAG_XCORRUPT)))
 440                 xrep_failure(sc->mp);
 441 }
 442 #else
 443 static inline void xchk_postmortem(struct xfs_scrub *sc)
 444 {
 445         /*
 446          * Userspace asked us to scrub something, it's broken, and we have no
 447          * way of fixing it.  Scream in the logs.
 448          */
 449         if (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
 450                                 XFS_SCRUB_OFLAG_XCORRUPT))
 451                 xfs_alert_ratelimited(sc->mp,
 452                                 "Corruption detected during scrub.");
 453 }
 454 #endif /* CONFIG_XFS_ONLINE_REPAIR */
 455
 456 /* Dispatch metadata scrubbing. */
 457 int
 458 xfs_scrub_metadata(
 459         struct xfs_inode                *ip,
 460         struct xfs_scrub_metadata       *sm)
 461 {
 462         struct xfs_scrub                sc = {
 463                 .mp                     = ip->i_mount,
 464                 .sm                     = sm,
 465                 .sa                     = {
 466                         .agno           = NULLAGNUMBER,
 467                 },
 468         };
 469         struct xfs_mount                *mp = ip->i_mount;
 470         int                             error = 0;
 471
 472         BUILD_BUG_ON(sizeof(meta_scrub_ops) !=
 473                 (sizeof(struct xchk_meta_ops) * XFS_SCRUB_TYPE_NR));
 474
 475         trace_xchk_start(ip, sm, error);
 476
 477         /* Forbidden if we are shut down or mounted norecovery. */
 478         error = -ESHUTDOWN;
 479         if (XFS_FORCED_SHUTDOWN(mp))
 480                 goto out;
 481         error = -ENOTRECOVERABLE;
 482         if (mp->m_flags & XFS_MOUNT_NORECOVERY)
 483                 goto out;
 484
 485         error = xchk_validate_inputs(mp, sm);
 486         if (error)
 487                 goto out;
 488
 489         xchk_experimental_warning(mp);
 490
 491         sc.ops = &meta_scrub_ops[sm->sm_type];
 492         sc.sick_mask = xchk_health_mask_for_scrub_type(sm->sm_type);
 493 retry_op:
 494         /*
 495          * If freeze runs concurrently with a scrub, the freeze can be delayed
 496          * indefinitely as we walk the filesystem and iterate over metadata
 497          * buffers.  Freeze quiesces the log (which waits for the buffer LRU to
 498          * be emptied) and that won't happen while checking is running.
 499          */
 500         sb_start_write(mp->m_super);
 501
 502         /* Set up for the operation. */
 503         error = sc.ops->setup(&sc, ip);
 504         if (error)
 505                 goto out_teardown;
 506
 507         /* Scrub for errors. */
 508         error = sc.ops->scrub(&sc);
 509         if (!(sc.flags & XCHK_TRY_HARDER) && error == -EDEADLOCK) {
 510                 /*
 511                  * Scrubbers return -EDEADLOCK to mean 'try harder'.
 512                  * Tear down everything we hold, then set up again with
 513                  * preparation for worst-case scenarios.
 514                  */
 515                 error = xchk_teardown(&sc, ip, 0);
 516                 if (error)
 517                         goto out;
 518                 sc.flags |= XCHK_TRY_HARDER;
 519                 goto retry_op;
 520         } else if (error)
 521                 goto out_teardown;
 522
 523         xchk_update_health(&sc);
 524
 525         if ((sc.sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) &&
 526             !(sc.flags & XREP_ALREADY_FIXED)) {
 527                 bool needs_fix;
 528
 529                 /* Let debug users force us into the repair routines. */
 530                 if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_FORCE_SCRUB_REPAIR))
 531                         sc.sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT;
 532
 533                 needs_fix = (sc.sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
 534                                                 XFS_SCRUB_OFLAG_XCORRUPT |
 535                                                 XFS_SCRUB_OFLAG_PREEN));
 536                 /*
 537                  * If userspace asked for a repair but it wasn't necessary,
 538                  * report that back to userspace.
 539                  */
 540                 if (!needs_fix) {
 541                         sc.sm->sm_flags |= XFS_SCRUB_OFLAG_NO_REPAIR_NEEDED;
 542                         goto out_nofix;
 543                 }
 544
 545                 /*
 546                  * If it's broken, userspace wants us to fix it, and we haven't
 547                  * already tried to fix it, then attempt a repair.
 548                  */
 549                 error = xrep_attempt(ip, &sc);
 550                 if (error == -EAGAIN) {
 551                         /*
 552                          * Either the repair function succeeded or it couldn't
 553                          * get all the resources it needs; either way, we go
 554                          * back to the beginning and call the scrub function.
 555                          */
 556                         error = xchk_teardown(&sc, ip, 0);
 557                         if (error) {
 558                                 xrep_failure(mp);
 559                                 goto out;
 560                         }
 561                         goto retry_op;
 562                 }
 563         }
 564
 565 out_nofix:
 566         xchk_postmortem(&sc);
 567 out_teardown:
 568         error = xchk_teardown(&sc, ip, error);
 569 out:
 570         trace_xchk_done(ip, sm, error);
 571         if (error == -EFSCORRUPTED || error == -EFSBADCRC) {
 572                 sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT;
 573                 error = 0;
 574         }
 575         return error;
 576 }