1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2017-2023 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <djwong@kernel.org> 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_scrub.h" 18#include "xfs_buf_mem.h" 19#include "xfs_rmap.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#include "scrub/stats.h" 26#include "scrub/xfile.h" 27 28/* 29 * Online Scrub and Repair 30 * 31 * Traditionally, XFS (the kernel driver) did not know how to check or 32 * repair on-disk data structures. That task was left to the xfs_check 33 * and xfs_repair tools, both of which require taking the filesystem 34 * offline for a thorough but time consuming examination. Online 35 * scrub & repair, on the other hand, enables us to check the metadata 36 * for obvious errors while carefully stepping around the filesystem's 37 * ongoing operations, locking rules, etc. 38 * 39 * Given that most XFS metadata consist of records stored in a btree, 40 * most of the checking functions iterate the btree blocks themselves 41 * looking for irregularities. When a record block is encountered, each 42 * record can be checked for obviously bad values. Record values can 43 * also be cross-referenced against other btrees to look for potential 44 * misunderstandings between pieces of metadata. 45 * 46 * It is expected that the checkers responsible for per-AG metadata 47 * structures will lock the AG headers (AGI, AGF, AGFL), iterate the 48 * metadata structure, and perform any relevant cross-referencing before 49 * unlocking the AG and returning the results to userspace. These 50 * scrubbers must not keep an AG locked for too long to avoid tying up 51 * the block and inode allocators. 52 * 53 * Block maps and b-trees rooted in an inode present a special challenge 54 * because they can involve extents from any AG. The general scrubber 55 * structure of lock -> check -> xref -> unlock still holds, but AG 56 * locking order rules /must/ be obeyed to avoid deadlocks. The 57 * ordering rule, of course, is that we must lock in increasing AG 58 * order. Helper functions are provided to track which AG headers we've 59 * already locked. If we detect an imminent locking order violation, we 60 * can signal a potential deadlock, in which case the scrubber can jump 61 * out to the top level, lock all the AGs in order, and retry the scrub. 62 * 63 * For file data (directories, extended attributes, symlinks) scrub, we 64 * can simply lock the inode and walk the data. For btree data 65 * (directories and attributes) we follow the same btree-scrubbing 66 * strategy outlined previously to check the records. 67 * 68 * We use a bit of trickery with transactions to avoid buffer deadlocks 69 * if there is a cycle in the metadata. The basic problem is that 70 * travelling down a btree involves locking the current buffer at each 71 * tree level. If a pointer should somehow point back to a buffer that 72 * we've already examined, we will deadlock due to the second buffer 73 * locking attempt. Note however that grabbing a buffer in transaction 74 * context links the locked buffer to the transaction. If we try to 75 * re-grab the buffer in the context of the same transaction, we avoid 76 * the second lock attempt and continue. Between the verifier and the 77 * scrubber, something will notice that something is amiss and report 78 * the corruption. Therefore, each scrubber will allocate an empty 79 * transaction, attach buffers to it, and cancel the transaction at the 80 * end of the scrub run. Cancelling a non-dirty transaction simply 81 * unlocks the buffers. 82 * 83 * There are four pieces of data that scrub can communicate to 84 * userspace. The first is the error code (errno), which can be used to 85 * communicate operational errors in performing the scrub. There are 86 * also three flags that can be set in the scrub context. If the data 87 * structure itself is corrupt, the CORRUPT flag will be set. If 88 * the metadata is correct but otherwise suboptimal, the PREEN flag 89 * will be set. 90 * 91 * We perform secondary validation of filesystem metadata by 92 * cross-referencing every record with all other available metadata. 93 * For example, for block mapping extents, we verify that there are no 94 * records in the free space and inode btrees corresponding to that 95 * space extent and that there is a corresponding entry in the reverse 96 * mapping btree. Inconsistent metadata is noted by setting the 97 * XCORRUPT flag; btree query function errors are noted by setting the 98 * XFAIL flag and deleting the cursor to prevent further attempts to 99 * cross-reference with a defective btree. 100 * 101 * If a piece of metadata proves corrupt or suboptimal, the userspace 102 * program can ask the kernel to apply some tender loving care (TLC) to 103 * the metadata object by setting the REPAIR flag and re-calling the 104 * scrub ioctl. "Corruption" is defined by metadata violating the 105 * on-disk specification; operations cannot continue if the violation is 106 * left untreated. It is possible for XFS to continue if an object is 107 * "suboptimal", however performance may be degraded. Repairs are 108 * usually performed by rebuilding the metadata entirely out of 109 * redundant metadata. Optimizing, on the other hand, can sometimes be 110 * done without rebuilding entire structures. 111 * 112 * Generally speaking, the repair code has the following code structure: 113 * Lock -> scrub -> repair -> commit -> re-lock -> re-scrub -> unlock. 114 * The first check helps us figure out if we need to rebuild or simply 115 * optimize the structure so that the rebuild knows what to do. The 116 * second check evaluates the completeness of the repair; that is what 117 * is reported to userspace. 118 * 119 * A quick note on symbol prefixes: 120 * - "xfs_" are general XFS symbols. 121 * - "xchk_" are symbols related to metadata checking. 122 * - "xrep_" are symbols related to metadata repair. 123 * - "xfs_scrub_" are symbols that tie online fsck to the rest of XFS. 124 */ 125 126/* 127 * Scrub probe -- userspace uses this to probe if we're willing to scrub 128 * or repair a given mountpoint. This will be used by xfs_scrub to 129 * probe the kernel's abilities to scrub (and repair) the metadata. We 130 * do this by validating the ioctl inputs from userspace, preparing the 131 * filesystem for a scrub (or a repair) operation, and immediately 132 * returning to userspace. Userspace can use the returned errno and 133 * structure state to decide (in broad terms) if scrub/repair are 134 * supported by the running kernel. 135 */ 136static int 137xchk_probe( 138 struct xfs_scrub *sc) 139{ 140 int error = 0; 141 142 if (xchk_should_terminate(sc, &error)) 143 return error; 144 145 return 0; 146} 147 148/* Scrub setup and teardown */ 149 150static inline void 151xchk_fsgates_disable( 152 struct xfs_scrub *sc) 153{ 154 if (!(sc->flags & XCHK_FSGATES_ALL)) 155 return; 156 157 trace_xchk_fsgates_disable(sc, sc->flags & XCHK_FSGATES_ALL); 158 159 if (sc->flags & XCHK_FSGATES_DRAIN) 160 xfs_drain_wait_disable(); 161 162 if (sc->flags & XCHK_FSGATES_QUOTA) 163 xfs_dqtrx_hook_disable(); 164 165 if (sc->flags & XCHK_FSGATES_DIRENTS) 166 xfs_dir_hook_disable(); 167 168 if (sc->flags & XCHK_FSGATES_RMAP) 169 xfs_rmap_hook_disable(); 170 171 sc->flags &= ~XCHK_FSGATES_ALL; 172} 173 174/* Free all the resources and finish the transactions. */ 175STATIC int 176xchk_teardown( 177 struct xfs_scrub *sc, 178 int error) 179{ 180 xchk_ag_free(sc, &sc->sa); 181 if (sc->tp) { 182 if (error == 0 && (sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR)) 183 error = xfs_trans_commit(sc->tp); 184 else 185 xfs_trans_cancel(sc->tp); 186 sc->tp = NULL; 187 } 188 if (sc->ip) { 189 if (sc->ilock_flags) 190 xchk_iunlock(sc, sc->ilock_flags); 191 xchk_irele(sc, sc->ip); 192 sc->ip = NULL; 193 } 194 if (sc->flags & XCHK_HAVE_FREEZE_PROT) { 195 sc->flags &= ~XCHK_HAVE_FREEZE_PROT; 196 mnt_drop_write_file(sc->file); 197 } 198 if (sc->xmbtp) { 199 xmbuf_free(sc->xmbtp); 200 sc->xmbtp = NULL; 201 } 202 if (sc->xfile) { 203 xfile_destroy(sc->xfile); 204 sc->xfile = NULL; 205 } 206 if (sc->buf) { 207 if (sc->buf_cleanup) 208 sc->buf_cleanup(sc->buf); 209 kvfree(sc->buf); 210 sc->buf_cleanup = NULL; 211 sc->buf = NULL; 212 } 213 214 xchk_fsgates_disable(sc); 215 return error; 216} 217 218/* Scrubbing dispatch. */ 219 220static const struct xchk_meta_ops meta_scrub_ops[] = { 221 [XFS_SCRUB_TYPE_PROBE] = { /* ioctl presence test */ 222 .type = ST_NONE, 223 .setup = xchk_setup_fs, 224 .scrub = xchk_probe, 225 .repair = xrep_probe, 226 }, 227 [XFS_SCRUB_TYPE_SB] = { /* superblock */ 228 .type = ST_PERAG, 229 .setup = xchk_setup_agheader, 230 .scrub = xchk_superblock, 231 .repair = xrep_superblock, 232 }, 233 [XFS_SCRUB_TYPE_AGF] = { /* agf */ 234 .type = ST_PERAG, 235 .setup = xchk_setup_agheader, 236 .scrub = xchk_agf, 237 .repair = xrep_agf, 238 }, 239 [XFS_SCRUB_TYPE_AGFL]= { /* agfl */ 240 .type = ST_PERAG, 241 .setup = xchk_setup_agheader, 242 .scrub = xchk_agfl, 243 .repair = xrep_agfl, 244 }, 245 [XFS_SCRUB_TYPE_AGI] = { /* agi */ 246 .type = ST_PERAG, 247 .setup = xchk_setup_agheader, 248 .scrub = xchk_agi, 249 .repair = xrep_agi, 250 }, 251 [XFS_SCRUB_TYPE_BNOBT] = { /* bnobt */ 252 .type = ST_PERAG, 253 .setup = xchk_setup_ag_allocbt, 254 .scrub = xchk_allocbt, 255 .repair = xrep_allocbt, 256 .repair_eval = xrep_revalidate_allocbt, 257 }, 258 [XFS_SCRUB_TYPE_CNTBT] = { /* cntbt */ 259 .type = ST_PERAG, 260 .setup = xchk_setup_ag_allocbt, 261 .scrub = xchk_allocbt, 262 .repair = xrep_allocbt, 263 .repair_eval = xrep_revalidate_allocbt, 264 }, 265 [XFS_SCRUB_TYPE_INOBT] = { /* inobt */ 266 .type = ST_PERAG, 267 .setup = xchk_setup_ag_iallocbt, 268 .scrub = xchk_iallocbt, 269 .repair = xrep_iallocbt, 270 .repair_eval = xrep_revalidate_iallocbt, 271 }, 272 [XFS_SCRUB_TYPE_FINOBT] = { /* finobt */ 273 .type = ST_PERAG, 274 .setup = xchk_setup_ag_iallocbt, 275 .scrub = xchk_iallocbt, 276 .has = xfs_has_finobt, 277 .repair = xrep_iallocbt, 278 .repair_eval = xrep_revalidate_iallocbt, 279 }, 280 [XFS_SCRUB_TYPE_RMAPBT] = { /* rmapbt */ 281 .type = ST_PERAG, 282 .setup = xchk_setup_ag_rmapbt, 283 .scrub = xchk_rmapbt, 284 .has = xfs_has_rmapbt, 285 .repair = xrep_rmapbt, 286 }, 287 [XFS_SCRUB_TYPE_REFCNTBT] = { /* refcountbt */ 288 .type = ST_PERAG, 289 .setup = xchk_setup_ag_refcountbt, 290 .scrub = xchk_refcountbt, 291 .has = xfs_has_reflink, 292 .repair = xrep_refcountbt, 293 }, 294 [XFS_SCRUB_TYPE_INODE] = { /* inode record */ 295 .type = ST_INODE, 296 .setup = xchk_setup_inode, 297 .scrub = xchk_inode, 298 .repair = xrep_inode, 299 }, 300 [XFS_SCRUB_TYPE_BMBTD] = { /* inode data fork */ 301 .type = ST_INODE, 302 .setup = xchk_setup_inode_bmap, 303 .scrub = xchk_bmap_data, 304 .repair = xrep_bmap_data, 305 }, 306 [XFS_SCRUB_TYPE_BMBTA] = { /* inode attr fork */ 307 .type = ST_INODE, 308 .setup = xchk_setup_inode_bmap, 309 .scrub = xchk_bmap_attr, 310 .repair = xrep_bmap_attr, 311 }, 312 [XFS_SCRUB_TYPE_BMBTC] = { /* inode CoW fork */ 313 .type = ST_INODE, 314 .setup = xchk_setup_inode_bmap, 315 .scrub = xchk_bmap_cow, 316 .repair = xrep_bmap_cow, 317 }, 318 [XFS_SCRUB_TYPE_DIR] = { /* directory */ 319 .type = ST_INODE, 320 .setup = xchk_setup_directory, 321 .scrub = xchk_directory, 322 .repair = xrep_notsupported, 323 }, 324 [XFS_SCRUB_TYPE_XATTR] = { /* extended attributes */ 325 .type = ST_INODE, 326 .setup = xchk_setup_xattr, 327 .scrub = xchk_xattr, 328 .repair = xrep_notsupported, 329 }, 330 [XFS_SCRUB_TYPE_SYMLINK] = { /* symbolic link */ 331 .type = ST_INODE, 332 .setup = xchk_setup_symlink, 333 .scrub = xchk_symlink, 334 .repair = xrep_notsupported, 335 }, 336 [XFS_SCRUB_TYPE_PARENT] = { /* parent pointers */ 337 .type = ST_INODE, 338 .setup = xchk_setup_parent, 339 .scrub = xchk_parent, 340 .repair = xrep_notsupported, 341 }, 342 [XFS_SCRUB_TYPE_RTBITMAP] = { /* realtime bitmap */ 343 .type = ST_FS, 344 .setup = xchk_setup_rtbitmap, 345 .scrub = xchk_rtbitmap, 346 .repair = xrep_rtbitmap, 347 }, 348 [XFS_SCRUB_TYPE_RTSUM] = { /* realtime summary */ 349 .type = ST_FS, 350 .setup = xchk_setup_rtsummary, 351 .scrub = xchk_rtsummary, 352 .repair = xrep_notsupported, 353 }, 354 [XFS_SCRUB_TYPE_UQUOTA] = { /* user quota */ 355 .type = ST_FS, 356 .setup = xchk_setup_quota, 357 .scrub = xchk_quota, 358 .repair = xrep_quota, 359 }, 360 [XFS_SCRUB_TYPE_GQUOTA] = { /* group quota */ 361 .type = ST_FS, 362 .setup = xchk_setup_quota, 363 .scrub = xchk_quota, 364 .repair = xrep_quota, 365 }, 366 [XFS_SCRUB_TYPE_PQUOTA] = { /* project quota */ 367 .type = ST_FS, 368 .setup = xchk_setup_quota, 369 .scrub = xchk_quota, 370 .repair = xrep_quota, 371 }, 372 [XFS_SCRUB_TYPE_FSCOUNTERS] = { /* fs summary counters */ 373 .type = ST_FS, 374 .setup = xchk_setup_fscounters, 375 .scrub = xchk_fscounters, 376 .repair = xrep_fscounters, 377 }, 378 [XFS_SCRUB_TYPE_QUOTACHECK] = { /* quota counters */ 379 .type = ST_FS, 380 .setup = xchk_setup_quotacheck, 381 .scrub = xchk_quotacheck, 382 .repair = xrep_quotacheck, 383 }, 384 [XFS_SCRUB_TYPE_NLINKS] = { /* inode link counts */ 385 .type = ST_FS, 386 .setup = xchk_setup_nlinks, 387 .scrub = xchk_nlinks, 388 .repair = xrep_nlinks, 389 }, 390 [XFS_SCRUB_TYPE_HEALTHY] = { /* fs healthy; clean all reminders */ 391 .type = ST_FS, 392 .setup = xchk_setup_fs, 393 .scrub = xchk_health_record, 394 .repair = xrep_notsupported, 395 }, 396}; 397 398static int 399xchk_validate_inputs( 400 struct xfs_mount *mp, 401 struct xfs_scrub_metadata *sm) 402{ 403 int error; 404 const struct xchk_meta_ops *ops; 405 406 error = -EINVAL; 407 /* Check our inputs. */ 408 sm->sm_flags &= ~XFS_SCRUB_FLAGS_OUT; 409 if (sm->sm_flags & ~XFS_SCRUB_FLAGS_IN) 410 goto out; 411 /* sm_reserved[] must be zero */ 412 if (memchr_inv(sm->sm_reserved, 0, sizeof(sm->sm_reserved))) 413 goto out; 414 415 error = -ENOENT; 416 /* Do we know about this type of metadata? */ 417 if (sm->sm_type >= XFS_SCRUB_TYPE_NR) 418 goto out; 419 ops = &meta_scrub_ops[sm->sm_type]; 420 if (ops->setup == NULL || ops->scrub == NULL) 421 goto out; 422 /* Does this fs even support this type of metadata? */ 423 if (ops->has && !ops->has(mp)) 424 goto out; 425 426 error = -EINVAL; 427 /* restricting fields must be appropriate for type */ 428 switch (ops->type) { 429 case ST_NONE: 430 case ST_FS: 431 if (sm->sm_ino || sm->sm_gen || sm->sm_agno) 432 goto out; 433 break; 434 case ST_PERAG: 435 if (sm->sm_ino || sm->sm_gen || 436 sm->sm_agno >= mp->m_sb.sb_agcount) 437 goto out; 438 break; 439 case ST_INODE: 440 if (sm->sm_agno || (sm->sm_gen && !sm->sm_ino)) 441 goto out; 442 break; 443 default: 444 goto out; 445 } 446 447 /* No rebuild without repair. */ 448 if ((sm->sm_flags & XFS_SCRUB_IFLAG_FORCE_REBUILD) && 449 !(sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR)) 450 return -EINVAL; 451 452 /* 453 * We only want to repair read-write v5+ filesystems. Defer the check 454 * for ops->repair until after our scrub confirms that we need to 455 * perform repairs so that we avoid failing due to not supporting 456 * repairing an object that doesn't need repairs. 457 */ 458 if (sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) { 459 error = -EOPNOTSUPP; 460 if (!xfs_has_crc(mp)) 461 goto out; 462 463 error = -EROFS; 464 if (xfs_is_readonly(mp)) 465 goto out; 466 } 467 468 error = 0; 469out: 470 return error; 471} 472 473#ifdef CONFIG_XFS_ONLINE_REPAIR 474static inline void xchk_postmortem(struct xfs_scrub *sc) 475{ 476 /* 477 * Userspace asked us to repair something, we repaired it, rescanned 478 * it, and the rescan says it's still broken. Scream about this in 479 * the system logs. 480 */ 481 if ((sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) && 482 (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT | 483 XFS_SCRUB_OFLAG_XCORRUPT))) 484 xrep_failure(sc->mp); 485} 486#else 487static inline void xchk_postmortem(struct xfs_scrub *sc) 488{ 489 /* 490 * Userspace asked us to scrub something, it's broken, and we have no 491 * way of fixing it. Scream in the logs. 492 */ 493 if (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT | 494 XFS_SCRUB_OFLAG_XCORRUPT)) 495 xfs_alert_ratelimited(sc->mp, 496 "Corruption detected during scrub."); 497} 498#endif /* CONFIG_XFS_ONLINE_REPAIR */ 499 500/* Dispatch metadata scrubbing. */ 501int 502xfs_scrub_metadata( 503 struct file *file, 504 struct xfs_scrub_metadata *sm) 505{ 506 struct xchk_stats_run run = { }; 507 struct xfs_scrub *sc; 508 struct xfs_mount *mp = XFS_I(file_inode(file))->i_mount; 509 u64 check_start; 510 int error = 0; 511 512 BUILD_BUG_ON(sizeof(meta_scrub_ops) != 513 (sizeof(struct xchk_meta_ops) * XFS_SCRUB_TYPE_NR)); 514 515 trace_xchk_start(XFS_I(file_inode(file)), sm, error); 516 517 /* Forbidden if we are shut down or mounted norecovery. */ 518 error = -ESHUTDOWN; 519 if (xfs_is_shutdown(mp)) 520 goto out; 521 error = -ENOTRECOVERABLE; 522 if (xfs_has_norecovery(mp)) 523 goto out; 524 525 error = xchk_validate_inputs(mp, sm); 526 if (error) 527 goto out; 528 529 xfs_warn_mount(mp, XFS_OPSTATE_WARNED_SCRUB, 530 "EXPERIMENTAL online scrub feature in use. Use at your own risk!"); 531 532 sc = kzalloc(sizeof(struct xfs_scrub), XCHK_GFP_FLAGS); 533 if (!sc) { 534 error = -ENOMEM; 535 goto out; 536 } 537 538 sc->mp = mp; 539 sc->file = file; 540 sc->sm = sm; 541 sc->ops = &meta_scrub_ops[sm->sm_type]; 542 sc->sick_mask = xchk_health_mask_for_scrub_type(sm->sm_type); 543retry_op: 544 /* 545 * When repairs are allowed, prevent freezing or readonly remount while 546 * scrub is running with a real transaction. 547 */ 548 if (sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) { 549 error = mnt_want_write_file(sc->file); 550 if (error) 551 goto out_sc; 552 553 sc->flags |= XCHK_HAVE_FREEZE_PROT; 554 } 555 556 /* Set up for the operation. */ 557 error = sc->ops->setup(sc); 558 if (error == -EDEADLOCK && !(sc->flags & XCHK_TRY_HARDER)) 559 goto try_harder; 560 if (error == -ECHRNG && !(sc->flags & XCHK_NEED_DRAIN)) 561 goto need_drain; 562 if (error) 563 goto out_teardown; 564 565 /* Scrub for errors. */ 566 check_start = xchk_stats_now(); 567 if ((sc->flags & XREP_ALREADY_FIXED) && sc->ops->repair_eval != NULL) 568 error = sc->ops->repair_eval(sc); 569 else 570 error = sc->ops->scrub(sc); 571 run.scrub_ns += xchk_stats_elapsed_ns(check_start); 572 if (error == -EDEADLOCK && !(sc->flags & XCHK_TRY_HARDER)) 573 goto try_harder; 574 if (error == -ECHRNG && !(sc->flags & XCHK_NEED_DRAIN)) 575 goto need_drain; 576 if (error || (sm->sm_flags & XFS_SCRUB_OFLAG_INCOMPLETE)) 577 goto out_teardown; 578 579 xchk_update_health(sc); 580 581 if (xchk_could_repair(sc)) { 582 /* 583 * If userspace asked for a repair but it wasn't necessary, 584 * report that back to userspace. 585 */ 586 if (!xrep_will_attempt(sc)) { 587 sc->sm->sm_flags |= XFS_SCRUB_OFLAG_NO_REPAIR_NEEDED; 588 goto out_nofix; 589 } 590 591 /* 592 * If it's broken, userspace wants us to fix it, and we haven't 593 * already tried to fix it, then attempt a repair. 594 */ 595 error = xrep_attempt(sc, &run); 596 if (error == -EAGAIN) { 597 /* 598 * Either the repair function succeeded or it couldn't 599 * get all the resources it needs; either way, we go 600 * back to the beginning and call the scrub function. 601 */ 602 error = xchk_teardown(sc, 0); 603 if (error) { 604 xrep_failure(mp); 605 goto out_sc; 606 } 607 goto retry_op; 608 } 609 } 610 611out_nofix: 612 xchk_postmortem(sc); 613out_teardown: 614 error = xchk_teardown(sc, error); 615out_sc: 616 if (error != -ENOENT) 617 xchk_stats_merge(mp, sm, &run); 618 kfree(sc); 619out: 620 trace_xchk_done(XFS_I(file_inode(file)), sm, error); 621 if (error == -EFSCORRUPTED || error == -EFSBADCRC) { 622 sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT; 623 error = 0; 624 } 625 return error; 626need_drain: 627 error = xchk_teardown(sc, 0); 628 if (error) 629 goto out_sc; 630 sc->flags |= XCHK_NEED_DRAIN; 631 run.retries++; 632 goto retry_op; 633try_harder: 634 /* 635 * Scrubbers return -EDEADLOCK to mean 'try harder'. Tear down 636 * everything we hold, then set up again with preparation for 637 * worst-case scenarios. 638 */ 639 error = xchk_teardown(sc, 0); 640 if (error) 641 goto out_sc; 642 sc->flags |= XCHK_TRY_HARDER; 643 run.retries++; 644 goto retry_op; 645} 646