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In a few patches, we'll add some online repair code that tries to massage the ondisk inode record just enough to get it to pass the inode verifiers so that we can continue with more file repairs. Part of that massaging can include zapping the ondisk forks to clear errors. After that point, the bmap fork repair functions will rebuild the zapped forks. Christoph asked for stronger protections against online repair zapping a fork to get the inode to load vs. other threads trying to access the partially repaired file. Do this by adding a special "[DA]FORK_ZAPPED" inode health flag whenever repair zaps a fork, and sprinkling checks for that flag into the various file operations for things that don't like handling an unexpected zero-extents fork. In practice xfs_scrub will scrub and fix the forks almost immediately after zapping them, so the window is very small. However, if a crash or unmount should occur, we can still detect these zapped inode forks by looking for a zero-extents fork when data was expected. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
400 lines
9.7 KiB
C
400 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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_log_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_inode.h"
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#include "xfs_trace.h"
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#include "xfs_health.h"
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#include "xfs_ag.h"
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/*
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* Warn about metadata corruption that we detected but haven't fixed, and
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* make sure we're not sitting on anything that would get in the way of
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* recovery.
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*/
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void
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xfs_health_unmount(
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struct xfs_mount *mp)
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{
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struct xfs_perag *pag;
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xfs_agnumber_t agno;
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unsigned int sick = 0;
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unsigned int checked = 0;
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bool warn = false;
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if (xfs_is_shutdown(mp))
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return;
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/* Measure AG corruption levels. */
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for_each_perag(mp, agno, pag) {
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xfs_ag_measure_sickness(pag, &sick, &checked);
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if (sick) {
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trace_xfs_ag_unfixed_corruption(mp, agno, sick);
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warn = true;
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}
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}
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/* Measure realtime volume corruption levels. */
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xfs_rt_measure_sickness(mp, &sick, &checked);
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if (sick) {
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trace_xfs_rt_unfixed_corruption(mp, sick);
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warn = true;
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}
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/*
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* Measure fs corruption and keep the sample around for the warning.
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* See the note below for why we exempt FS_COUNTERS.
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*/
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xfs_fs_measure_sickness(mp, &sick, &checked);
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if (sick & ~XFS_SICK_FS_COUNTERS) {
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trace_xfs_fs_unfixed_corruption(mp, sick);
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warn = true;
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}
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if (warn) {
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xfs_warn(mp,
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"Uncorrected metadata errors detected; please run xfs_repair.");
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/*
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* We discovered uncorrected metadata problems at some point
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* during this filesystem mount and have advised the
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* administrator to run repair once the unmount completes.
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*
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* However, we must be careful -- when FSCOUNTERS are flagged
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* unhealthy, the unmount procedure omits writing the clean
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* unmount record to the log so that the next mount will run
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* recovery and recompute the summary counters. In other
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* words, we leave a dirty log to get the counters fixed.
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*
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* Unfortunately, xfs_repair cannot recover dirty logs, so if
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* there were filesystem problems, FSCOUNTERS was flagged, and
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* the administrator takes our advice to run xfs_repair,
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* they'll have to zap the log before repairing structures.
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* We don't really want to encourage this, so we mark the
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* FSCOUNTERS healthy so that a subsequent repair run won't see
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* a dirty log.
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*/
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if (sick & XFS_SICK_FS_COUNTERS)
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xfs_fs_mark_healthy(mp, XFS_SICK_FS_COUNTERS);
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}
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}
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/* Mark unhealthy per-fs metadata. */
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void
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xfs_fs_mark_sick(
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struct xfs_mount *mp,
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unsigned int mask)
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{
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ASSERT(!(mask & ~XFS_SICK_FS_PRIMARY));
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trace_xfs_fs_mark_sick(mp, mask);
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spin_lock(&mp->m_sb_lock);
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mp->m_fs_sick |= mask;
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mp->m_fs_checked |= mask;
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spin_unlock(&mp->m_sb_lock);
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}
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/* Mark a per-fs metadata healed. */
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void
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xfs_fs_mark_healthy(
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struct xfs_mount *mp,
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unsigned int mask)
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{
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ASSERT(!(mask & ~XFS_SICK_FS_PRIMARY));
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trace_xfs_fs_mark_healthy(mp, mask);
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spin_lock(&mp->m_sb_lock);
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mp->m_fs_sick &= ~mask;
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mp->m_fs_checked |= mask;
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spin_unlock(&mp->m_sb_lock);
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}
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/* Sample which per-fs metadata are unhealthy. */
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void
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xfs_fs_measure_sickness(
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struct xfs_mount *mp,
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unsigned int *sick,
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unsigned int *checked)
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{
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spin_lock(&mp->m_sb_lock);
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*sick = mp->m_fs_sick;
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*checked = mp->m_fs_checked;
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spin_unlock(&mp->m_sb_lock);
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}
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/* Mark unhealthy realtime metadata. */
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void
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xfs_rt_mark_sick(
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struct xfs_mount *mp,
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unsigned int mask)
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{
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ASSERT(!(mask & ~XFS_SICK_RT_PRIMARY));
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trace_xfs_rt_mark_sick(mp, mask);
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spin_lock(&mp->m_sb_lock);
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mp->m_rt_sick |= mask;
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mp->m_rt_checked |= mask;
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spin_unlock(&mp->m_sb_lock);
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}
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/* Mark a realtime metadata healed. */
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void
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xfs_rt_mark_healthy(
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struct xfs_mount *mp,
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unsigned int mask)
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{
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ASSERT(!(mask & ~XFS_SICK_RT_PRIMARY));
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trace_xfs_rt_mark_healthy(mp, mask);
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spin_lock(&mp->m_sb_lock);
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mp->m_rt_sick &= ~mask;
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mp->m_rt_checked |= mask;
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spin_unlock(&mp->m_sb_lock);
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}
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/* Sample which realtime metadata are unhealthy. */
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void
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xfs_rt_measure_sickness(
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struct xfs_mount *mp,
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unsigned int *sick,
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unsigned int *checked)
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{
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spin_lock(&mp->m_sb_lock);
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*sick = mp->m_rt_sick;
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*checked = mp->m_rt_checked;
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spin_unlock(&mp->m_sb_lock);
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}
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/* Mark unhealthy per-ag metadata. */
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void
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xfs_ag_mark_sick(
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struct xfs_perag *pag,
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unsigned int mask)
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{
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ASSERT(!(mask & ~XFS_SICK_AG_PRIMARY));
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trace_xfs_ag_mark_sick(pag->pag_mount, pag->pag_agno, mask);
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spin_lock(&pag->pag_state_lock);
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pag->pag_sick |= mask;
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pag->pag_checked |= mask;
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spin_unlock(&pag->pag_state_lock);
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}
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/* Mark per-ag metadata ok. */
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void
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xfs_ag_mark_healthy(
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struct xfs_perag *pag,
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unsigned int mask)
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{
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ASSERT(!(mask & ~XFS_SICK_AG_PRIMARY));
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trace_xfs_ag_mark_healthy(pag->pag_mount, pag->pag_agno, mask);
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spin_lock(&pag->pag_state_lock);
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pag->pag_sick &= ~mask;
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pag->pag_checked |= mask;
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spin_unlock(&pag->pag_state_lock);
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}
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/* Sample which per-ag metadata are unhealthy. */
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void
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xfs_ag_measure_sickness(
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struct xfs_perag *pag,
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unsigned int *sick,
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unsigned int *checked)
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{
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spin_lock(&pag->pag_state_lock);
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*sick = pag->pag_sick;
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*checked = pag->pag_checked;
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spin_unlock(&pag->pag_state_lock);
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}
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/* Mark the unhealthy parts of an inode. */
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void
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xfs_inode_mark_sick(
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struct xfs_inode *ip,
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unsigned int mask)
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{
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ASSERT(!(mask & ~(XFS_SICK_INO_PRIMARY | XFS_SICK_INO_ZAPPED)));
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trace_xfs_inode_mark_sick(ip, mask);
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spin_lock(&ip->i_flags_lock);
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ip->i_sick |= mask;
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ip->i_checked |= mask;
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spin_unlock(&ip->i_flags_lock);
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/*
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* Keep this inode around so we don't lose the sickness report. Scrub
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* grabs inodes with DONTCACHE assuming that most inode are ok, which
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* is not the case here.
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*/
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spin_lock(&VFS_I(ip)->i_lock);
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VFS_I(ip)->i_state &= ~I_DONTCACHE;
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spin_unlock(&VFS_I(ip)->i_lock);
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}
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/* Mark parts of an inode healed. */
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void
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xfs_inode_mark_healthy(
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struct xfs_inode *ip,
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unsigned int mask)
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{
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ASSERT(!(mask & ~(XFS_SICK_INO_PRIMARY | XFS_SICK_INO_ZAPPED)));
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trace_xfs_inode_mark_healthy(ip, mask);
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spin_lock(&ip->i_flags_lock);
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ip->i_sick &= ~mask;
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ip->i_checked |= mask;
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spin_unlock(&ip->i_flags_lock);
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}
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/* Sample which parts of an inode are unhealthy. */
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void
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xfs_inode_measure_sickness(
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struct xfs_inode *ip,
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unsigned int *sick,
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unsigned int *checked)
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{
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spin_lock(&ip->i_flags_lock);
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*sick = ip->i_sick;
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*checked = ip->i_checked;
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spin_unlock(&ip->i_flags_lock);
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}
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/* Mappings between internal sick masks and ioctl sick masks. */
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struct ioctl_sick_map {
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unsigned int sick_mask;
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unsigned int ioctl_mask;
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};
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static const struct ioctl_sick_map fs_map[] = {
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{ XFS_SICK_FS_COUNTERS, XFS_FSOP_GEOM_SICK_COUNTERS},
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{ XFS_SICK_FS_UQUOTA, XFS_FSOP_GEOM_SICK_UQUOTA },
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{ XFS_SICK_FS_GQUOTA, XFS_FSOP_GEOM_SICK_GQUOTA },
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{ XFS_SICK_FS_PQUOTA, XFS_FSOP_GEOM_SICK_PQUOTA },
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{ 0, 0 },
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};
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static const struct ioctl_sick_map rt_map[] = {
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{ XFS_SICK_RT_BITMAP, XFS_FSOP_GEOM_SICK_RT_BITMAP },
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{ XFS_SICK_RT_SUMMARY, XFS_FSOP_GEOM_SICK_RT_SUMMARY },
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{ 0, 0 },
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};
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static inline void
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xfgeo_health_tick(
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struct xfs_fsop_geom *geo,
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unsigned int sick,
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unsigned int checked,
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const struct ioctl_sick_map *m)
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{
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if (checked & m->sick_mask)
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geo->checked |= m->ioctl_mask;
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if (sick & m->sick_mask)
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geo->sick |= m->ioctl_mask;
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}
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/* Fill out fs geometry health info. */
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void
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xfs_fsop_geom_health(
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struct xfs_mount *mp,
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struct xfs_fsop_geom *geo)
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{
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const struct ioctl_sick_map *m;
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unsigned int sick;
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unsigned int checked;
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geo->sick = 0;
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geo->checked = 0;
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xfs_fs_measure_sickness(mp, &sick, &checked);
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for (m = fs_map; m->sick_mask; m++)
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xfgeo_health_tick(geo, sick, checked, m);
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xfs_rt_measure_sickness(mp, &sick, &checked);
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for (m = rt_map; m->sick_mask; m++)
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xfgeo_health_tick(geo, sick, checked, m);
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}
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static const struct ioctl_sick_map ag_map[] = {
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{ XFS_SICK_AG_SB, XFS_AG_GEOM_SICK_SB },
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{ XFS_SICK_AG_AGF, XFS_AG_GEOM_SICK_AGF },
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{ XFS_SICK_AG_AGFL, XFS_AG_GEOM_SICK_AGFL },
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{ XFS_SICK_AG_AGI, XFS_AG_GEOM_SICK_AGI },
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{ XFS_SICK_AG_BNOBT, XFS_AG_GEOM_SICK_BNOBT },
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{ XFS_SICK_AG_CNTBT, XFS_AG_GEOM_SICK_CNTBT },
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{ XFS_SICK_AG_INOBT, XFS_AG_GEOM_SICK_INOBT },
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{ XFS_SICK_AG_FINOBT, XFS_AG_GEOM_SICK_FINOBT },
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{ XFS_SICK_AG_RMAPBT, XFS_AG_GEOM_SICK_RMAPBT },
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{ XFS_SICK_AG_REFCNTBT, XFS_AG_GEOM_SICK_REFCNTBT },
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{ 0, 0 },
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};
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/* Fill out ag geometry health info. */
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void
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xfs_ag_geom_health(
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struct xfs_perag *pag,
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struct xfs_ag_geometry *ageo)
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{
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const struct ioctl_sick_map *m;
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unsigned int sick;
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unsigned int checked;
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ageo->ag_sick = 0;
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ageo->ag_checked = 0;
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xfs_ag_measure_sickness(pag, &sick, &checked);
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for (m = ag_map; m->sick_mask; m++) {
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if (checked & m->sick_mask)
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ageo->ag_checked |= m->ioctl_mask;
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if (sick & m->sick_mask)
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ageo->ag_sick |= m->ioctl_mask;
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}
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}
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static const struct ioctl_sick_map ino_map[] = {
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{ XFS_SICK_INO_CORE, XFS_BS_SICK_INODE },
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{ XFS_SICK_INO_BMBTD, XFS_BS_SICK_BMBTD },
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{ XFS_SICK_INO_BMBTA, XFS_BS_SICK_BMBTA },
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{ XFS_SICK_INO_BMBTC, XFS_BS_SICK_BMBTC },
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{ XFS_SICK_INO_DIR, XFS_BS_SICK_DIR },
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{ XFS_SICK_INO_XATTR, XFS_BS_SICK_XATTR },
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{ XFS_SICK_INO_SYMLINK, XFS_BS_SICK_SYMLINK },
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{ XFS_SICK_INO_PARENT, XFS_BS_SICK_PARENT },
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{ XFS_SICK_INO_BMBTD_ZAPPED, XFS_BS_SICK_BMBTD },
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{ XFS_SICK_INO_BMBTA_ZAPPED, XFS_BS_SICK_BMBTA },
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{ XFS_SICK_INO_DIR_ZAPPED, XFS_BS_SICK_DIR },
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{ XFS_SICK_INO_SYMLINK_ZAPPED, XFS_BS_SICK_SYMLINK },
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{ 0, 0 },
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};
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/* Fill out bulkstat health info. */
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void
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xfs_bulkstat_health(
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struct xfs_inode *ip,
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struct xfs_bulkstat *bs)
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{
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const struct ioctl_sick_map *m;
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unsigned int sick;
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unsigned int checked;
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bs->bs_sick = 0;
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bs->bs_checked = 0;
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xfs_inode_measure_sickness(ip, &sick, &checked);
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for (m = ino_map; m->sick_mask; m++) {
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if (checked & m->sick_mask)
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bs->bs_checked |= m->ioctl_mask;
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if (sick & m->sick_mask)
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bs->bs_sick |= m->ioctl_mask;
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}
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}
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