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8389f3ffa2
Don't bother looking for cross-referencing problems if the metadata is already corrupt or we've already found a cross-referencing problem. Since we added a helper function for flags testing, convert existing users to use it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
467 lines
14 KiB
C
467 lines
14 KiB
C
/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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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_defer.h"
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#include "xfs_btree.h"
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#include "xfs_bit.h"
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#include "xfs_log_format.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_inode.h"
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#include "xfs_icache.h"
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#include "xfs_itable.h"
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#include "xfs_alloc.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_ialloc.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_refcount.h"
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#include "xfs_refcount_btree.h"
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#include "xfs_rmap.h"
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#include "xfs_rmap_btree.h"
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#include "xfs_quota.h"
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#include "xfs_qm.h"
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#include "scrub/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/btree.h"
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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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/*
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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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xfs_scrub_probe(
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struct xfs_scrub_context *sc)
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{
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int error = 0;
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if (xfs_scrub_should_terminate(sc, &error))
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return error;
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return 0;
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}
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/* Scrub setup and teardown */
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/* Free all the resources and finish the transactions. */
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STATIC int
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xfs_scrub_teardown(
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struct xfs_scrub_context *sc,
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struct xfs_inode *ip_in,
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int error)
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{
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xfs_scrub_ag_free(sc, &sc->sa);
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if (sc->tp) {
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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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iput(VFS_I(sc->ip));
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sc->ip = NULL;
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}
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if (sc->has_quotaofflock)
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mutex_unlock(&sc->mp->m_quotainfo->qi_quotaofflock);
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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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/* Scrubbing dispatch. */
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static const struct xfs_scrub_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 = xfs_scrub_setup_fs,
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.scrub = xfs_scrub_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 = xfs_scrub_setup_fs,
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.scrub = xfs_scrub_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 = xfs_scrub_setup_fs,
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.scrub = xfs_scrub_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 = xfs_scrub_setup_fs,
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.scrub = xfs_scrub_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 = xfs_scrub_setup_fs,
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.scrub = xfs_scrub_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 = xfs_scrub_setup_ag_allocbt,
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.scrub = xfs_scrub_bnobt,
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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 = xfs_scrub_setup_ag_allocbt,
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.scrub = xfs_scrub_cntbt,
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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 = xfs_scrub_setup_ag_iallocbt,
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.scrub = xfs_scrub_inobt,
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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 = xfs_scrub_setup_ag_iallocbt,
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.scrub = xfs_scrub_finobt,
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.has = xfs_sb_version_hasfinobt,
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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 = xfs_scrub_setup_ag_rmapbt,
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.scrub = xfs_scrub_rmapbt,
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.has = xfs_sb_version_hasrmapbt,
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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 = xfs_scrub_setup_ag_refcountbt,
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.scrub = xfs_scrub_refcountbt,
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.has = xfs_sb_version_hasreflink,
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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 = xfs_scrub_setup_inode,
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.scrub = xfs_scrub_inode,
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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 = xfs_scrub_setup_inode_bmap,
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.scrub = xfs_scrub_bmap_data,
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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 = xfs_scrub_setup_inode_bmap,
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.scrub = xfs_scrub_bmap_attr,
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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 = xfs_scrub_setup_inode_bmap,
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.scrub = xfs_scrub_bmap_cow,
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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 = xfs_scrub_setup_directory,
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.scrub = xfs_scrub_directory,
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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 = xfs_scrub_setup_xattr,
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.scrub = xfs_scrub_xattr,
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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 = xfs_scrub_setup_symlink,
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.scrub = xfs_scrub_symlink,
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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 = xfs_scrub_setup_parent,
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.scrub = xfs_scrub_parent,
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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 = xfs_scrub_setup_rt,
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.scrub = xfs_scrub_rtbitmap,
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.has = xfs_sb_version_hasrealtime,
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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 = xfs_scrub_setup_rt,
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.scrub = xfs_scrub_rtsummary,
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.has = xfs_sb_version_hasrealtime,
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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 = xfs_scrub_setup_quota,
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.scrub = xfs_scrub_quota,
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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 = xfs_scrub_setup_quota,
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.scrub = xfs_scrub_quota,
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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 = xfs_scrub_setup_quota,
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.scrub = xfs_scrub_quota,
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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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xfs_scrub_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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"xfs_scrub_warning", 86400 * HZ, 1);
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ratelimit_set_flags(&scrub_warning, RATELIMIT_MSG_ON_RELEASE);
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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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static int
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xfs_scrub_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 xfs_scrub_meta_ops *ops;
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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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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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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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error = -EOPNOTSUPP;
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/*
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* We won't scrub any filesystem that doesn't have the ability
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* to record unwritten extents. The option was made default in
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* 2003, removed from mkfs in 2007, and cannot be disabled in
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* v5, so if we find a filesystem without this flag it's either
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* really old or totally unsupported. Avoid it either way.
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* We also don't support v1-v3 filesystems, which aren't
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* mountable.
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*/
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if (!xfs_sb_version_hasextflgbit(&mp->m_sb))
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goto out;
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/* We don't know how to repair anything yet. */
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if (sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR)
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goto out;
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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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/* 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_context sc;
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struct xfs_mount *mp = ip->i_mount;
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bool try_harder = false;
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int error = 0;
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BUILD_BUG_ON(sizeof(meta_scrub_ops) !=
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(sizeof(struct xfs_scrub_meta_ops) * XFS_SCRUB_TYPE_NR));
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trace_xfs_scrub_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 = xfs_scrub_validate_inputs(mp, sm);
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if (error)
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goto out;
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xfs_scrub_experimental_warning(mp);
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retry_op:
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/* Set up for the operation. */
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memset(&sc, 0, sizeof(sc));
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sc.mp = ip->i_mount;
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sc.sm = sm;
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sc.ops = &meta_scrub_ops[sm->sm_type];
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sc.try_harder = try_harder;
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sc.sa.agno = NULLAGNUMBER;
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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 (!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 = xfs_scrub_teardown(&sc, ip, 0);
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if (error)
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goto out;
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try_harder = true;
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goto retry_op;
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} else if (error)
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goto out_teardown;
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if (sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
|
|
XFS_SCRUB_OFLAG_XCORRUPT))
|
|
xfs_alert_ratelimited(mp, "Corruption detected during scrub.");
|
|
|
|
out_teardown:
|
|
error = xfs_scrub_teardown(&sc, ip, error);
|
|
out:
|
|
trace_xfs_scrub_done(ip, sm, error);
|
|
if (error == -EFSCORRUPTED || error == -EFSBADCRC) {
|
|
sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT;
|
|
error = 0;
|
|
}
|
|
return error;
|
|
}
|