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576 lines
17 KiB
576 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2017 Oracle. All Rights Reserved. |
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* Author: Darrick J. Wong <[email protected]> |
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*/ |
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#include "xfs.h" |
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#include "xfs_fs.h" |
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#include "xfs_shared.h" |
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#include "xfs_format.h" |
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#include "xfs_trans_resv.h" |
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#include "xfs_mount.h" |
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#include "xfs_log_format.h" |
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#include "xfs_trans.h" |
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#include "xfs_inode.h" |
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#include "xfs_quota.h" |
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#include "xfs_qm.h" |
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#include "xfs_errortag.h" |
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#include "xfs_error.h" |
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#include "xfs_scrub.h" |
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#include "scrub/scrub.h" |
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#include "scrub/common.h" |
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#include "scrub/trace.h" |
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#include "scrub/repair.h" |
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#include "scrub/health.h" |
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|
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/* |
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* Online Scrub and Repair |
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* |
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* Traditionally, XFS (the kernel driver) did not know how to check or |
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* repair on-disk data structures. That task was left to the xfs_check |
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* and xfs_repair tools, both of which require taking the filesystem |
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* offline for a thorough but time consuming examination. Online |
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* scrub & repair, on the other hand, enables us to check the metadata |
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* for obvious errors while carefully stepping around the filesystem's |
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* ongoing operations, locking rules, etc. |
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* |
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* Given that most XFS metadata consist of records stored in a btree, |
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* most of the checking functions iterate the btree blocks themselves |
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* looking for irregularities. When a record block is encountered, each |
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* record can be checked for obviously bad values. Record values can |
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* also be cross-referenced against other btrees to look for potential |
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* misunderstandings between pieces of metadata. |
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* |
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* It is expected that the checkers responsible for per-AG metadata |
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* structures will lock the AG headers (AGI, AGF, AGFL), iterate the |
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* metadata structure, and perform any relevant cross-referencing before |
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* unlocking the AG and returning the results to userspace. These |
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* scrubbers must not keep an AG locked for too long to avoid tying up |
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* the block and inode allocators. |
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* |
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* Block maps and b-trees rooted in an inode present a special challenge |
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* because they can involve extents from any AG. The general scrubber |
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* structure of lock -> check -> xref -> unlock still holds, but AG |
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* locking order rules /must/ be obeyed to avoid deadlocks. The |
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* ordering rule, of course, is that we must lock in increasing AG |
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* order. Helper functions are provided to track which AG headers we've |
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* already locked. If we detect an imminent locking order violation, we |
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* can signal a potential deadlock, in which case the scrubber can jump |
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* out to the top level, lock all the AGs in order, and retry the scrub. |
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* |
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* For file data (directories, extended attributes, symlinks) scrub, we |
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* can simply lock the inode and walk the data. For btree data |
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* (directories and attributes) we follow the same btree-scrubbing |
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* strategy outlined previously to check the records. |
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* |
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* We use a bit of trickery with transactions to avoid buffer deadlocks |
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* if there is a cycle in the metadata. The basic problem is that |
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* travelling down a btree involves locking the current buffer at each |
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* tree level. If a pointer should somehow point back to a buffer that |
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* we've already examined, we will deadlock due to the second buffer |
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* locking attempt. Note however that grabbing a buffer in transaction |
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* context links the locked buffer to the transaction. If we try to |
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* re-grab the buffer in the context of the same transaction, we avoid |
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* the second lock attempt and continue. Between the verifier and the |
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* scrubber, something will notice that something is amiss and report |
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* the corruption. Therefore, each scrubber will allocate an empty |
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* transaction, attach buffers to it, and cancel the transaction at the |
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* end of the scrub run. Cancelling a non-dirty transaction simply |
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* unlocks the buffers. |
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* |
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* There are four pieces of data that scrub can communicate to |
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* userspace. The first is the error code (errno), which can be used to |
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* communicate operational errors in performing the scrub. There are |
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* also three flags that can be set in the scrub context. If the data |
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* structure itself is corrupt, the CORRUPT flag will be set. If |
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* the metadata is correct but otherwise suboptimal, the PREEN flag |
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* will be set. |
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* |
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* We perform secondary validation of filesystem metadata by |
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* cross-referencing every record with all other available metadata. |
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* For example, for block mapping extents, we verify that there are no |
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* records in the free space and inode btrees corresponding to that |
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* space extent and that there is a corresponding entry in the reverse |
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* mapping btree. Inconsistent metadata is noted by setting the |
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* XCORRUPT flag; btree query function errors are noted by setting the |
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* XFAIL flag and deleting the cursor to prevent further attempts to |
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* cross-reference with a defective btree. |
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* |
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* If a piece of metadata proves corrupt or suboptimal, the userspace |
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* program can ask the kernel to apply some tender loving care (TLC) to |
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* the metadata object by setting the REPAIR flag and re-calling the |
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* scrub ioctl. "Corruption" is defined by metadata violating the |
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* on-disk specification; operations cannot continue if the violation is |
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* left untreated. It is possible for XFS to continue if an object is |
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* "suboptimal", however performance may be degraded. Repairs are |
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* usually performed by rebuilding the metadata entirely out of |
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* redundant metadata. Optimizing, on the other hand, can sometimes be |
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* done without rebuilding entire structures. |
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* |
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* Generally speaking, the repair code has the following code structure: |
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* Lock -> scrub -> repair -> commit -> re-lock -> re-scrub -> unlock. |
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* The first check helps us figure out if we need to rebuild or simply |
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* optimize the structure so that the rebuild knows what to do. The |
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* second check evaluates the completeness of the repair; that is what |
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* is reported to userspace. |
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* |
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* A quick note on symbol prefixes: |
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* - "xfs_" are general XFS symbols. |
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* - "xchk_" are symbols related to metadata checking. |
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* - "xrep_" are symbols related to metadata repair. |
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* - "xfs_scrub_" are symbols that tie online fsck to the rest of XFS. |
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*/ |
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|
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/* |
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* Scrub probe -- userspace uses this to probe if we're willing to scrub |
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* or repair a given mountpoint. This will be used by xfs_scrub to |
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* probe the kernel's abilities to scrub (and repair) the metadata. We |
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* do this by validating the ioctl inputs from userspace, preparing the |
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* filesystem for a scrub (or a repair) operation, and immediately |
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* returning to userspace. Userspace can use the returned errno and |
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* structure state to decide (in broad terms) if scrub/repair are |
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* supported by the running kernel. |
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*/ |
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static int |
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xchk_probe( |
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struct xfs_scrub *sc) |
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{ |
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int error = 0; |
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|
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if (xchk_should_terminate(sc, &error)) |
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return error; |
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|
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return 0; |
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} |
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|
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/* Scrub setup and teardown */ |
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|
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/* Free all the resources and finish the transactions. */ |
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STATIC int |
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xchk_teardown( |
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struct xfs_scrub *sc, |
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struct xfs_inode *ip_in, |
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int error) |
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{ |
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xchk_ag_free(sc, &sc->sa); |
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if (sc->tp) { |
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if (error == 0 && (sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR)) |
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error = xfs_trans_commit(sc->tp); |
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else |
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xfs_trans_cancel(sc->tp); |
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sc->tp = NULL; |
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} |
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if (sc->ip) { |
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if (sc->ilock_flags) |
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xfs_iunlock(sc->ip, sc->ilock_flags); |
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if (sc->ip != ip_in && |
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!xfs_internal_inum(sc->mp, sc->ip->i_ino)) |
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xfs_irele(sc->ip); |
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sc->ip = NULL; |
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} |
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sb_end_write(sc->mp->m_super); |
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if (sc->flags & XCHK_REAPING_DISABLED) |
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xchk_start_reaping(sc); |
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if (sc->flags & XCHK_HAS_QUOTAOFFLOCK) { |
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mutex_unlock(&sc->mp->m_quotainfo->qi_quotaofflock); |
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sc->flags &= ~XCHK_HAS_QUOTAOFFLOCK; |
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} |
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if (sc->buf) { |
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kmem_free(sc->buf); |
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sc->buf = NULL; |
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} |
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return error; |
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} |
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|
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/* Scrubbing dispatch. */ |
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|
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static const struct xchk_meta_ops meta_scrub_ops[] = { |
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[XFS_SCRUB_TYPE_PROBE] = { /* ioctl presence test */ |
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.type = ST_NONE, |
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.setup = xchk_setup_fs, |
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.scrub = xchk_probe, |
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.repair = xrep_probe, |
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}, |
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[XFS_SCRUB_TYPE_SB] = { /* superblock */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_fs, |
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.scrub = xchk_superblock, |
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.repair = xrep_superblock, |
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}, |
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[XFS_SCRUB_TYPE_AGF] = { /* agf */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_fs, |
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.scrub = xchk_agf, |
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.repair = xrep_agf, |
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}, |
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[XFS_SCRUB_TYPE_AGFL]= { /* agfl */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_fs, |
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.scrub = xchk_agfl, |
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.repair = xrep_agfl, |
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}, |
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[XFS_SCRUB_TYPE_AGI] = { /* agi */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_fs, |
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.scrub = xchk_agi, |
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.repair = xrep_agi, |
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}, |
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[XFS_SCRUB_TYPE_BNOBT] = { /* bnobt */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_ag_allocbt, |
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.scrub = xchk_bnobt, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_CNTBT] = { /* cntbt */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_ag_allocbt, |
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.scrub = xchk_cntbt, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_INOBT] = { /* inobt */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_ag_iallocbt, |
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.scrub = xchk_inobt, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_FINOBT] = { /* finobt */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_ag_iallocbt, |
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.scrub = xchk_finobt, |
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.has = xfs_sb_version_hasfinobt, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_RMAPBT] = { /* rmapbt */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_ag_rmapbt, |
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.scrub = xchk_rmapbt, |
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.has = xfs_sb_version_hasrmapbt, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_REFCNTBT] = { /* refcountbt */ |
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.type = ST_PERAG, |
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.setup = xchk_setup_ag_refcountbt, |
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.scrub = xchk_refcountbt, |
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.has = xfs_sb_version_hasreflink, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_INODE] = { /* inode record */ |
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.type = ST_INODE, |
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.setup = xchk_setup_inode, |
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.scrub = xchk_inode, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_BMBTD] = { /* inode data fork */ |
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.type = ST_INODE, |
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.setup = xchk_setup_inode_bmap, |
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.scrub = xchk_bmap_data, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_BMBTA] = { /* inode attr fork */ |
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.type = ST_INODE, |
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.setup = xchk_setup_inode_bmap, |
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.scrub = xchk_bmap_attr, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_BMBTC] = { /* inode CoW fork */ |
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.type = ST_INODE, |
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.setup = xchk_setup_inode_bmap, |
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.scrub = xchk_bmap_cow, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_DIR] = { /* directory */ |
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.type = ST_INODE, |
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.setup = xchk_setup_directory, |
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.scrub = xchk_directory, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_XATTR] = { /* extended attributes */ |
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.type = ST_INODE, |
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.setup = xchk_setup_xattr, |
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.scrub = xchk_xattr, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_SYMLINK] = { /* symbolic link */ |
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.type = ST_INODE, |
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.setup = xchk_setup_symlink, |
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.scrub = xchk_symlink, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_PARENT] = { /* parent pointers */ |
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.type = ST_INODE, |
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.setup = xchk_setup_parent, |
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.scrub = xchk_parent, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_RTBITMAP] = { /* realtime bitmap */ |
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.type = ST_FS, |
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.setup = xchk_setup_rt, |
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.scrub = xchk_rtbitmap, |
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.has = xfs_sb_version_hasrealtime, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_RTSUM] = { /* realtime summary */ |
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.type = ST_FS, |
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.setup = xchk_setup_rt, |
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.scrub = xchk_rtsummary, |
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.has = xfs_sb_version_hasrealtime, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_UQUOTA] = { /* user quota */ |
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.type = ST_FS, |
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.setup = xchk_setup_quota, |
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.scrub = xchk_quota, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_GQUOTA] = { /* group quota */ |
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.type = ST_FS, |
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.setup = xchk_setup_quota, |
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.scrub = xchk_quota, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_PQUOTA] = { /* project quota */ |
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.type = ST_FS, |
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.setup = xchk_setup_quota, |
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.scrub = xchk_quota, |
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.repair = xrep_notsupported, |
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}, |
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[XFS_SCRUB_TYPE_FSCOUNTERS] = { /* fs summary counters */ |
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.type = ST_FS, |
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.setup = xchk_setup_fscounters, |
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.scrub = xchk_fscounters, |
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.repair = xrep_notsupported, |
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}, |
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}; |
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|
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/* This isn't a stable feature, warn once per day. */ |
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static inline void |
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xchk_experimental_warning( |
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struct xfs_mount *mp) |
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{ |
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static struct ratelimit_state scrub_warning = RATELIMIT_STATE_INIT( |
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"xchk_warning", 86400 * HZ, 1); |
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ratelimit_set_flags(&scrub_warning, RATELIMIT_MSG_ON_RELEASE); |
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|
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if (__ratelimit(&scrub_warning)) |
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xfs_alert(mp, |
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"EXPERIMENTAL online scrub feature in use. Use at your own risk!"); |
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} |
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|
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static int |
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xchk_validate_inputs( |
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struct xfs_mount *mp, |
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struct xfs_scrub_metadata *sm) |
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{ |
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int error; |
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const struct xchk_meta_ops *ops; |
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|
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error = -EINVAL; |
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/* Check our inputs. */ |
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sm->sm_flags &= ~XFS_SCRUB_FLAGS_OUT; |
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if (sm->sm_flags & ~XFS_SCRUB_FLAGS_IN) |
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goto out; |
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/* sm_reserved[] must be zero */ |
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if (memchr_inv(sm->sm_reserved, 0, sizeof(sm->sm_reserved))) |
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goto out; |
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|
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error = -ENOENT; |
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/* Do we know about this type of metadata? */ |
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if (sm->sm_type >= XFS_SCRUB_TYPE_NR) |
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goto out; |
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ops = &meta_scrub_ops[sm->sm_type]; |
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if (ops->setup == NULL || ops->scrub == NULL) |
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goto out; |
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/* Does this fs even support this type of metadata? */ |
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if (ops->has && !ops->has(&mp->m_sb)) |
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goto out; |
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|
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error = -EINVAL; |
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/* restricting fields must be appropriate for type */ |
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switch (ops->type) { |
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case ST_NONE: |
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case ST_FS: |
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if (sm->sm_ino || sm->sm_gen || sm->sm_agno) |
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goto out; |
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break; |
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case ST_PERAG: |
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if (sm->sm_ino || sm->sm_gen || |
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sm->sm_agno >= mp->m_sb.sb_agcount) |
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goto out; |
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break; |
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case ST_INODE: |
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if (sm->sm_agno || (sm->sm_gen && !sm->sm_ino)) |
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goto out; |
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break; |
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default: |
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goto out; |
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} |
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|
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/* |
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* We only want to repair read-write v5+ filesystems. Defer the check |
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* for ops->repair until after our scrub confirms that we need to |
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* perform repairs so that we avoid failing due to not supporting |
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* repairing an object that doesn't need repairs. |
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*/ |
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if (sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) { |
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error = -EOPNOTSUPP; |
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if (!xfs_sb_version_hascrc(&mp->m_sb)) |
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goto out; |
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|
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error = -EROFS; |
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if (mp->m_flags & XFS_MOUNT_RDONLY) |
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goto out; |
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} |
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|
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error = 0; |
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out: |
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return error; |
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} |
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|
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#ifdef CONFIG_XFS_ONLINE_REPAIR |
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static inline void xchk_postmortem(struct xfs_scrub *sc) |
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{ |
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/* |
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* Userspace asked us to repair something, we repaired it, rescanned |
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* it, and the rescan says it's still broken. Scream about this in |
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* the system logs. |
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*/ |
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if ((sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) && |
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(sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT | |
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XFS_SCRUB_OFLAG_XCORRUPT))) |
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xrep_failure(sc->mp); |
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} |
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#else |
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static inline void xchk_postmortem(struct xfs_scrub *sc) |
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{ |
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/* |
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* Userspace asked us to scrub something, it's broken, and we have no |
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* way of fixing it. Scream in the logs. |
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*/ |
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if (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT | |
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XFS_SCRUB_OFLAG_XCORRUPT)) |
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xfs_alert_ratelimited(sc->mp, |
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"Corruption detected during scrub."); |
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} |
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#endif /* CONFIG_XFS_ONLINE_REPAIR */ |
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|
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/* Dispatch metadata scrubbing. */ |
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int |
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xfs_scrub_metadata( |
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struct xfs_inode *ip, |
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struct xfs_scrub_metadata *sm) |
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{ |
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struct xfs_scrub sc = { |
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.mp = ip->i_mount, |
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.sm = sm, |
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.sa = { |
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.agno = NULLAGNUMBER, |
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}, |
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}; |
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struct xfs_mount *mp = ip->i_mount; |
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int error = 0; |
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|
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BUILD_BUG_ON(sizeof(meta_scrub_ops) != |
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(sizeof(struct xchk_meta_ops) * XFS_SCRUB_TYPE_NR)); |
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|
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trace_xchk_start(ip, sm, error); |
|
|
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/* Forbidden if we are shut down or mounted norecovery. */ |
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error = -ESHUTDOWN; |
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if (XFS_FORCED_SHUTDOWN(mp)) |
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goto out; |
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error = -ENOTRECOVERABLE; |
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if (mp->m_flags & XFS_MOUNT_NORECOVERY) |
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goto out; |
|
|
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error = xchk_validate_inputs(mp, sm); |
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if (error) |
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goto out; |
|
|
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xchk_experimental_warning(mp); |
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|
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sc.ops = &meta_scrub_ops[sm->sm_type]; |
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sc.sick_mask = xchk_health_mask_for_scrub_type(sm->sm_type); |
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retry_op: |
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/* |
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* If freeze runs concurrently with a scrub, the freeze can be delayed |
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* indefinitely as we walk the filesystem and iterate over metadata |
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* buffers. Freeze quiesces the log (which waits for the buffer LRU to |
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* be emptied) and that won't happen while checking is running. |
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*/ |
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sb_start_write(mp->m_super); |
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|
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/* Set up for the operation. */ |
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error = sc.ops->setup(&sc, ip); |
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if (error) |
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goto out_teardown; |
|
|
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/* Scrub for errors. */ |
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error = sc.ops->scrub(&sc); |
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if (!(sc.flags & XCHK_TRY_HARDER) && error == -EDEADLOCK) { |
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/* |
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* Scrubbers return -EDEADLOCK to mean 'try harder'. |
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* Tear down everything we hold, then set up again with |
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* preparation for worst-case scenarios. |
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*/ |
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error = xchk_teardown(&sc, ip, 0); |
|
if (error) |
|
goto out; |
|
sc.flags |= XCHK_TRY_HARDER; |
|
goto retry_op; |
|
} else if (error) |
|
goto out_teardown; |
|
|
|
xchk_update_health(&sc); |
|
|
|
if ((sc.sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) && |
|
!(sc.flags & XREP_ALREADY_FIXED)) { |
|
bool needs_fix; |
|
|
|
/* Let debug users force us into the repair routines. */ |
|
if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_FORCE_SCRUB_REPAIR)) |
|
sc.sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT; |
|
|
|
needs_fix = (sc.sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT | |
|
XFS_SCRUB_OFLAG_XCORRUPT | |
|
XFS_SCRUB_OFLAG_PREEN)); |
|
/* |
|
* If userspace asked for a repair but it wasn't necessary, |
|
* report that back to userspace. |
|
*/ |
|
if (!needs_fix) { |
|
sc.sm->sm_flags |= XFS_SCRUB_OFLAG_NO_REPAIR_NEEDED; |
|
goto out_nofix; |
|
} |
|
|
|
/* |
|
* If it's broken, userspace wants us to fix it, and we haven't |
|
* already tried to fix it, then attempt a repair. |
|
*/ |
|
error = xrep_attempt(ip, &sc); |
|
if (error == -EAGAIN) { |
|
/* |
|
* Either the repair function succeeded or it couldn't |
|
* get all the resources it needs; either way, we go |
|
* back to the beginning and call the scrub function. |
|
*/ |
|
error = xchk_teardown(&sc, ip, 0); |
|
if (error) { |
|
xrep_failure(mp); |
|
goto out; |
|
} |
|
goto retry_op; |
|
} |
|
} |
|
|
|
out_nofix: |
|
xchk_postmortem(&sc); |
|
out_teardown: |
|
error = xchk_teardown(&sc, ip, error); |
|
out: |
|
trace_xchk_done(ip, sm, error); |
|
if (error == -EFSCORRUPTED || error == -EFSBADCRC) { |
|
sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT; |
|
error = 0; |
|
} |
|
return error; |
|
}
|
|
|