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![Darrick J. Wong](/assets/img/avatar_default.png)
Prior to commit 40b52225e5
("xfs: remove support for disabling quota
accounting on a mounted file system"), we used the quotaoff mutex to
protect dquot operations against quotaoff trying to pull down dquots as
part of disabling quota.
Now that we only support turning off quota enforcement, the quotaoff
mutex only protects changes in m_qflags/sb_qflags. We don't need it to
protect dquots, which means we can remove it from setqlimits and the
dquot scrub code. While we're at it, fix the function that forces
quotacheck, since it should have been taking the quotaoff mutex.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
964 lines
28 KiB
C
964 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018 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_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_btree.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_alloc.h"
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#include "xfs_alloc_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_rmap.h"
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#include "xfs_rmap_btree.h"
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#include "xfs_refcount_btree.h"
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#include "xfs_extent_busy.h"
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#include "xfs_ag.h"
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#include "xfs_ag_resv.h"
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#include "xfs_quota.h"
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#include "xfs_qm.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/bitmap.h"
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/*
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* Attempt to repair some metadata, if the metadata is corrupt and userspace
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* told us to fix it. This function returns -EAGAIN to mean "re-run scrub",
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* and will set *fixed to true if it thinks it repaired anything.
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*/
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int
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xrep_attempt(
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struct xfs_scrub *sc)
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{
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int error = 0;
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trace_xrep_attempt(XFS_I(file_inode(sc->file)), sc->sm, error);
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xchk_ag_btcur_free(&sc->sa);
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/* Repair whatever's broken. */
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ASSERT(sc->ops->repair);
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error = sc->ops->repair(sc);
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trace_xrep_done(XFS_I(file_inode(sc->file)), sc->sm, error);
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switch (error) {
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case 0:
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/*
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* Repair succeeded. Commit the fixes and perform a second
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* scrub so that we can tell userspace if we fixed the problem.
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*/
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sc->sm->sm_flags &= ~XFS_SCRUB_FLAGS_OUT;
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sc->flags |= XREP_ALREADY_FIXED;
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return -EAGAIN;
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case -EDEADLOCK:
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case -EAGAIN:
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/* Tell the caller to try again having grabbed all the locks. */
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if (!(sc->flags & XCHK_TRY_HARDER)) {
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sc->flags |= XCHK_TRY_HARDER;
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return -EAGAIN;
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}
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/*
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* We tried harder but still couldn't grab all the resources
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* we needed to fix it. The corruption has not been fixed,
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* so report back to userspace.
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*/
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return -EFSCORRUPTED;
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default:
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return error;
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}
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}
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/*
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* Complain about unfixable problems in the filesystem. We don't log
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* corruptions when IFLAG_REPAIR wasn't set on the assumption that the driver
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* program is xfs_scrub, which will call back with IFLAG_REPAIR set if the
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* administrator isn't running xfs_scrub in no-repairs mode.
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*
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* Use this helper function because _ratelimited silently declares a static
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* structure to track rate limiting information.
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*/
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void
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xrep_failure(
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struct xfs_mount *mp)
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{
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xfs_alert_ratelimited(mp,
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"Corruption not fixed during online repair. Unmount and run xfs_repair.");
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}
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/*
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* Repair probe -- userspace uses this to probe if we're willing to repair a
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* given mountpoint.
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*/
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int
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xrep_probe(
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struct xfs_scrub *sc)
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{
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int error = 0;
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if (xchk_should_terminate(sc, &error))
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return error;
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return 0;
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}
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/*
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* Roll a transaction, keeping the AG headers locked and reinitializing
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* the btree cursors.
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*/
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int
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xrep_roll_ag_trans(
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struct xfs_scrub *sc)
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{
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int error;
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/* Keep the AG header buffers locked so we can keep going. */
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if (sc->sa.agi_bp)
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xfs_trans_bhold(sc->tp, sc->sa.agi_bp);
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if (sc->sa.agf_bp)
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xfs_trans_bhold(sc->tp, sc->sa.agf_bp);
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if (sc->sa.agfl_bp)
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xfs_trans_bhold(sc->tp, sc->sa.agfl_bp);
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/*
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* Roll the transaction. We still own the buffer and the buffer lock
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* regardless of whether or not the roll succeeds. If the roll fails,
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* the buffers will be released during teardown on our way out of the
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* kernel. If it succeeds, we join them to the new transaction and
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* move on.
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*/
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error = xfs_trans_roll(&sc->tp);
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if (error)
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return error;
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/* Join AG headers to the new transaction. */
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if (sc->sa.agi_bp)
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xfs_trans_bjoin(sc->tp, sc->sa.agi_bp);
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if (sc->sa.agf_bp)
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xfs_trans_bjoin(sc->tp, sc->sa.agf_bp);
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if (sc->sa.agfl_bp)
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xfs_trans_bjoin(sc->tp, sc->sa.agfl_bp);
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return 0;
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}
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/*
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* Does the given AG have enough space to rebuild a btree? Neither AG
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* reservation can be critical, and we must have enough space (factoring
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* in AG reservations) to construct a whole btree.
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*/
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bool
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xrep_ag_has_space(
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struct xfs_perag *pag,
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xfs_extlen_t nr_blocks,
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enum xfs_ag_resv_type type)
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{
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return !xfs_ag_resv_critical(pag, XFS_AG_RESV_RMAPBT) &&
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!xfs_ag_resv_critical(pag, XFS_AG_RESV_METADATA) &&
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pag->pagf_freeblks > xfs_ag_resv_needed(pag, type) + nr_blocks;
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}
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/*
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* Figure out how many blocks to reserve for an AG repair. We calculate the
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* worst case estimate for the number of blocks we'd need to rebuild one of
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* any type of per-AG btree.
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*/
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xfs_extlen_t
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xrep_calc_ag_resblks(
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struct xfs_scrub *sc)
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{
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struct xfs_mount *mp = sc->mp;
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struct xfs_scrub_metadata *sm = sc->sm;
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struct xfs_perag *pag;
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struct xfs_buf *bp;
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xfs_agino_t icount = NULLAGINO;
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xfs_extlen_t aglen = NULLAGBLOCK;
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xfs_extlen_t usedlen;
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xfs_extlen_t freelen;
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xfs_extlen_t bnobt_sz;
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xfs_extlen_t inobt_sz;
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xfs_extlen_t rmapbt_sz;
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xfs_extlen_t refcbt_sz;
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int error;
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if (!(sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR))
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return 0;
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pag = xfs_perag_get(mp, sm->sm_agno);
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if (pag->pagi_init) {
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/* Use in-core icount if possible. */
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icount = pag->pagi_count;
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} else {
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/* Try to get the actual counters from disk. */
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error = xfs_ialloc_read_agi(mp, NULL, sm->sm_agno, &bp);
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if (!error) {
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icount = pag->pagi_count;
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xfs_buf_relse(bp);
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}
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}
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/* Now grab the block counters from the AGF. */
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error = xfs_alloc_read_agf(mp, NULL, sm->sm_agno, 0, &bp);
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if (error) {
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aglen = xfs_ag_block_count(mp, sm->sm_agno);
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freelen = aglen;
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usedlen = aglen;
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} else {
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struct xfs_agf *agf = bp->b_addr;
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aglen = be32_to_cpu(agf->agf_length);
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freelen = be32_to_cpu(agf->agf_freeblks);
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usedlen = aglen - freelen;
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xfs_buf_relse(bp);
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}
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xfs_perag_put(pag);
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/* If the icount is impossible, make some worst-case assumptions. */
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if (icount == NULLAGINO ||
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!xfs_verify_agino(mp, sm->sm_agno, icount)) {
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xfs_agino_t first, last;
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xfs_agino_range(mp, sm->sm_agno, &first, &last);
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icount = last - first + 1;
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}
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/* If the block counts are impossible, make worst-case assumptions. */
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if (aglen == NULLAGBLOCK ||
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aglen != xfs_ag_block_count(mp, sm->sm_agno) ||
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freelen >= aglen) {
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aglen = xfs_ag_block_count(mp, sm->sm_agno);
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freelen = aglen;
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usedlen = aglen;
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}
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trace_xrep_calc_ag_resblks(mp, sm->sm_agno, icount, aglen,
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freelen, usedlen);
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/*
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* Figure out how many blocks we'd need worst case to rebuild
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* each type of btree. Note that we can only rebuild the
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* bnobt/cntbt or inobt/finobt as pairs.
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*/
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bnobt_sz = 2 * xfs_allocbt_calc_size(mp, freelen);
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if (xfs_has_sparseinodes(mp))
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inobt_sz = xfs_iallocbt_calc_size(mp, icount /
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XFS_INODES_PER_HOLEMASK_BIT);
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else
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inobt_sz = xfs_iallocbt_calc_size(mp, icount /
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XFS_INODES_PER_CHUNK);
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if (xfs_has_finobt(mp))
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inobt_sz *= 2;
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if (xfs_has_reflink(mp))
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refcbt_sz = xfs_refcountbt_calc_size(mp, usedlen);
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else
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refcbt_sz = 0;
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if (xfs_has_rmapbt(mp)) {
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/*
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* Guess how many blocks we need to rebuild the rmapbt.
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* For non-reflink filesystems we can't have more records than
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* used blocks. However, with reflink it's possible to have
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* more than one rmap record per AG block. We don't know how
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* many rmaps there could be in the AG, so we start off with
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* what we hope is an generous over-estimation.
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*/
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if (xfs_has_reflink(mp))
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rmapbt_sz = xfs_rmapbt_calc_size(mp,
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(unsigned long long)aglen * 2);
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else
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rmapbt_sz = xfs_rmapbt_calc_size(mp, usedlen);
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} else {
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rmapbt_sz = 0;
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}
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trace_xrep_calc_ag_resblks_btsize(mp, sm->sm_agno, bnobt_sz,
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inobt_sz, rmapbt_sz, refcbt_sz);
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return max(max(bnobt_sz, inobt_sz), max(rmapbt_sz, refcbt_sz));
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}
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/* Allocate a block in an AG. */
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int
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xrep_alloc_ag_block(
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struct xfs_scrub *sc,
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const struct xfs_owner_info *oinfo,
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xfs_fsblock_t *fsbno,
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enum xfs_ag_resv_type resv)
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{
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struct xfs_alloc_arg args = {0};
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xfs_agblock_t bno;
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int error;
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switch (resv) {
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case XFS_AG_RESV_AGFL:
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case XFS_AG_RESV_RMAPBT:
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error = xfs_alloc_get_freelist(sc->tp, sc->sa.agf_bp, &bno, 1);
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if (error)
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return error;
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if (bno == NULLAGBLOCK)
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return -ENOSPC;
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xfs_extent_busy_reuse(sc->mp, sc->sa.pag, bno,
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1, false);
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*fsbno = XFS_AGB_TO_FSB(sc->mp, sc->sa.pag->pag_agno, bno);
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if (resv == XFS_AG_RESV_RMAPBT)
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xfs_ag_resv_rmapbt_alloc(sc->mp, sc->sa.pag->pag_agno);
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return 0;
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default:
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break;
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}
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args.tp = sc->tp;
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args.mp = sc->mp;
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args.oinfo = *oinfo;
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args.fsbno = XFS_AGB_TO_FSB(args.mp, sc->sa.pag->pag_agno, 0);
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args.minlen = 1;
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args.maxlen = 1;
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args.prod = 1;
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args.type = XFS_ALLOCTYPE_THIS_AG;
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args.resv = resv;
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error = xfs_alloc_vextent(&args);
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if (error)
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return error;
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if (args.fsbno == NULLFSBLOCK)
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return -ENOSPC;
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ASSERT(args.len == 1);
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*fsbno = args.fsbno;
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return 0;
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}
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/* Initialize a new AG btree root block with zero entries. */
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int
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xrep_init_btblock(
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struct xfs_scrub *sc,
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xfs_fsblock_t fsb,
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struct xfs_buf **bpp,
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xfs_btnum_t btnum,
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const struct xfs_buf_ops *ops)
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{
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struct xfs_trans *tp = sc->tp;
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struct xfs_mount *mp = sc->mp;
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struct xfs_buf *bp;
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int error;
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trace_xrep_init_btblock(mp, XFS_FSB_TO_AGNO(mp, fsb),
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XFS_FSB_TO_AGBNO(mp, fsb), btnum);
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ASSERT(XFS_FSB_TO_AGNO(mp, fsb) == sc->sa.pag->pag_agno);
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error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
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XFS_FSB_TO_DADDR(mp, fsb), XFS_FSB_TO_BB(mp, 1), 0,
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&bp);
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if (error)
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return error;
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xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
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xfs_btree_init_block(mp, bp, btnum, 0, 0, sc->sa.pag->pag_agno);
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xfs_trans_buf_set_type(tp, bp, XFS_BLFT_BTREE_BUF);
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xfs_trans_log_buf(tp, bp, 0, BBTOB(bp->b_length) - 1);
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bp->b_ops = ops;
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*bpp = bp;
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return 0;
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}
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/*
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* Reconstructing per-AG Btrees
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*
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* When a space btree is corrupt, we don't bother trying to fix it. Instead,
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* we scan secondary space metadata to derive the records that should be in
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* the damaged btree, initialize a fresh btree root, and insert the records.
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* Note that for rebuilding the rmapbt we scan all the primary data to
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* generate the new records.
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*
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* However, that leaves the matter of removing all the metadata describing the
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* old broken structure. For primary metadata we use the rmap data to collect
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* every extent with a matching rmap owner (bitmap); we then iterate all other
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* metadata structures with the same rmap owner to collect the extents that
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* cannot be removed (sublist). We then subtract sublist from bitmap to
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* derive the blocks that were used by the old btree. These blocks can be
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* reaped.
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*
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* For rmapbt reconstructions we must use different tactics for extent
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* collection. First we iterate all primary metadata (this excludes the old
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* rmapbt, obviously) to generate new rmap records. The gaps in the rmap
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* records are collected as bitmap. The bnobt records are collected as
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* sublist. As with the other btrees we subtract sublist from bitmap, and the
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* result (since the rmapbt lives in the free space) are the blocks from the
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* old rmapbt.
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*
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* Disposal of Blocks from Old per-AG Btrees
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*
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* Now that we've constructed a new btree to replace the damaged one, we want
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* to dispose of the blocks that (we think) the old btree was using.
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* Previously, we used the rmapbt to collect the extents (bitmap) with the
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* rmap owner corresponding to the tree we rebuilt, collected extents for any
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* blocks with the same rmap owner that are owned by another data structure
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* (sublist), and subtracted sublist from bitmap. In theory the extents
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* remaining in bitmap are the old btree's blocks.
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*
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* Unfortunately, it's possible that the btree was crosslinked with other
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* blocks on disk. The rmap data can tell us if there are multiple owners, so
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* if the rmapbt says there is an owner of this block other than @oinfo, then
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* the block is crosslinked. Remove the reverse mapping and continue.
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*
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* If there is one rmap record, we can free the block, which removes the
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* reverse mapping but doesn't add the block to the free space. Our repair
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* strategy is to hope the other metadata objects crosslinked on this block
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* will be rebuilt (atop different blocks), thereby removing all the cross
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* links.
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*
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* If there are no rmap records at all, we also free the block. If the btree
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* being rebuilt lives in the free space (bnobt/cntbt/rmapbt) then there isn't
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* supposed to be a rmap record and everything is ok. For other btrees there
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* had to have been an rmap entry for the block to have ended up on @bitmap,
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* so if it's gone now there's something wrong and the fs will shut down.
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*
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* Note: If there are multiple rmap records with only the same rmap owner as
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* the btree we're trying to rebuild and the block is indeed owned by another
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* data structure with the same rmap owner, then the block will be in sublist
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* and therefore doesn't need disposal. If there are multiple rmap records
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* with only the same rmap owner but the block is not owned by something with
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* the same rmap owner, the block will be freed.
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*
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* The caller is responsible for locking the AG headers for the entire rebuild
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* operation so that nothing else can sneak in and change the AG state while
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* we're not looking. We also assume that the caller already invalidated any
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* buffers associated with @bitmap.
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*/
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/*
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* Invalidate buffers for per-AG btree blocks we're dumping. This function
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* is not intended for use with file data repairs; we have bunmapi for that.
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*/
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int
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xrep_invalidate_blocks(
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struct xfs_scrub *sc,
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struct xbitmap *bitmap)
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{
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struct xbitmap_range *bmr;
|
|
struct xbitmap_range *n;
|
|
struct xfs_buf *bp;
|
|
xfs_fsblock_t fsbno;
|
|
|
|
/*
|
|
* For each block in each extent, see if there's an incore buffer for
|
|
* exactly that block; if so, invalidate it. The buffer cache only
|
|
* lets us look for one buffer at a time, so we have to look one block
|
|
* at a time. Avoid invalidating AG headers and post-EOFS blocks
|
|
* because we never own those; and if we can't TRYLOCK the buffer we
|
|
* assume it's owned by someone else.
|
|
*/
|
|
for_each_xbitmap_block(fsbno, bmr, n, bitmap) {
|
|
/* Skip AG headers and post-EOFS blocks */
|
|
if (!xfs_verify_fsbno(sc->mp, fsbno))
|
|
continue;
|
|
bp = xfs_buf_incore(sc->mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(sc->mp, fsbno),
|
|
XFS_FSB_TO_BB(sc->mp, 1), XBF_TRYLOCK);
|
|
if (bp) {
|
|
xfs_trans_bjoin(sc->tp, bp);
|
|
xfs_trans_binval(sc->tp, bp);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Ensure the freelist is the correct size. */
|
|
int
|
|
xrep_fix_freelist(
|
|
struct xfs_scrub *sc,
|
|
bool can_shrink)
|
|
{
|
|
struct xfs_alloc_arg args = {0};
|
|
|
|
args.mp = sc->mp;
|
|
args.tp = sc->tp;
|
|
args.agno = sc->sa.pag->pag_agno;
|
|
args.alignment = 1;
|
|
args.pag = sc->sa.pag;
|
|
|
|
return xfs_alloc_fix_freelist(&args,
|
|
can_shrink ? 0 : XFS_ALLOC_FLAG_NOSHRINK);
|
|
}
|
|
|
|
/*
|
|
* Put a block back on the AGFL.
|
|
*/
|
|
STATIC int
|
|
xrep_put_freelist(
|
|
struct xfs_scrub *sc,
|
|
xfs_agblock_t agbno)
|
|
{
|
|
int error;
|
|
|
|
/* Make sure there's space on the freelist. */
|
|
error = xrep_fix_freelist(sc, true);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Since we're "freeing" a lost block onto the AGFL, we have to
|
|
* create an rmap for the block prior to merging it or else other
|
|
* parts will break.
|
|
*/
|
|
error = xfs_rmap_alloc(sc->tp, sc->sa.agf_bp, sc->sa.pag, agbno, 1,
|
|
&XFS_RMAP_OINFO_AG);
|
|
if (error)
|
|
return error;
|
|
|
|
/* Put the block on the AGFL. */
|
|
error = xfs_alloc_put_freelist(sc->tp, sc->sa.agf_bp, sc->sa.agfl_bp,
|
|
agbno, 0);
|
|
if (error)
|
|
return error;
|
|
xfs_extent_busy_insert(sc->tp, sc->sa.pag, agbno, 1,
|
|
XFS_EXTENT_BUSY_SKIP_DISCARD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Dispose of a single block. */
|
|
STATIC int
|
|
xrep_reap_block(
|
|
struct xfs_scrub *sc,
|
|
xfs_fsblock_t fsbno,
|
|
const struct xfs_owner_info *oinfo,
|
|
enum xfs_ag_resv_type resv)
|
|
{
|
|
struct xfs_btree_cur *cur;
|
|
struct xfs_buf *agf_bp = NULL;
|
|
xfs_agnumber_t agno;
|
|
xfs_agblock_t agbno;
|
|
bool has_other_rmap;
|
|
int error;
|
|
|
|
agno = XFS_FSB_TO_AGNO(sc->mp, fsbno);
|
|
agbno = XFS_FSB_TO_AGBNO(sc->mp, fsbno);
|
|
|
|
/*
|
|
* If we are repairing per-inode metadata, we need to read in the AGF
|
|
* buffer. Otherwise, we're repairing a per-AG structure, so reuse
|
|
* the AGF buffer that the setup functions already grabbed.
|
|
*/
|
|
if (sc->ip) {
|
|
error = xfs_alloc_read_agf(sc->mp, sc->tp, agno, 0, &agf_bp);
|
|
if (error)
|
|
return error;
|
|
} else {
|
|
agf_bp = sc->sa.agf_bp;
|
|
}
|
|
cur = xfs_rmapbt_init_cursor(sc->mp, sc->tp, agf_bp, sc->sa.pag);
|
|
|
|
/* Can we find any other rmappings? */
|
|
error = xfs_rmap_has_other_keys(cur, agbno, 1, oinfo, &has_other_rmap);
|
|
xfs_btree_del_cursor(cur, error);
|
|
if (error)
|
|
goto out_free;
|
|
|
|
/*
|
|
* If there are other rmappings, this block is cross linked and must
|
|
* not be freed. Remove the reverse mapping and move on. Otherwise,
|
|
* we were the only owner of the block, so free the extent, which will
|
|
* also remove the rmap.
|
|
*
|
|
* XXX: XFS doesn't support detecting the case where a single block
|
|
* metadata structure is crosslinked with a multi-block structure
|
|
* because the buffer cache doesn't detect aliasing problems, so we
|
|
* can't fix 100% of crosslinking problems (yet). The verifiers will
|
|
* blow on writeout, the filesystem will shut down, and the admin gets
|
|
* to run xfs_repair.
|
|
*/
|
|
if (has_other_rmap)
|
|
error = xfs_rmap_free(sc->tp, agf_bp, sc->sa.pag, agbno,
|
|
1, oinfo);
|
|
else if (resv == XFS_AG_RESV_AGFL)
|
|
error = xrep_put_freelist(sc, agbno);
|
|
else
|
|
error = xfs_free_extent(sc->tp, fsbno, 1, oinfo, resv);
|
|
if (agf_bp != sc->sa.agf_bp)
|
|
xfs_trans_brelse(sc->tp, agf_bp);
|
|
if (error)
|
|
return error;
|
|
|
|
if (sc->ip)
|
|
return xfs_trans_roll_inode(&sc->tp, sc->ip);
|
|
return xrep_roll_ag_trans(sc);
|
|
|
|
out_free:
|
|
if (agf_bp != sc->sa.agf_bp)
|
|
xfs_trans_brelse(sc->tp, agf_bp);
|
|
return error;
|
|
}
|
|
|
|
/* Dispose of every block of every extent in the bitmap. */
|
|
int
|
|
xrep_reap_extents(
|
|
struct xfs_scrub *sc,
|
|
struct xbitmap *bitmap,
|
|
const struct xfs_owner_info *oinfo,
|
|
enum xfs_ag_resv_type type)
|
|
{
|
|
struct xbitmap_range *bmr;
|
|
struct xbitmap_range *n;
|
|
xfs_fsblock_t fsbno;
|
|
int error = 0;
|
|
|
|
ASSERT(xfs_has_rmapbt(sc->mp));
|
|
|
|
for_each_xbitmap_block(fsbno, bmr, n, bitmap) {
|
|
ASSERT(sc->ip != NULL ||
|
|
XFS_FSB_TO_AGNO(sc->mp, fsbno) == sc->sa.pag->pag_agno);
|
|
trace_xrep_dispose_btree_extent(sc->mp,
|
|
XFS_FSB_TO_AGNO(sc->mp, fsbno),
|
|
XFS_FSB_TO_AGBNO(sc->mp, fsbno), 1);
|
|
|
|
error = xrep_reap_block(sc, fsbno, oinfo, type);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Finding per-AG Btree Roots for AGF/AGI Reconstruction
|
|
*
|
|
* If the AGF or AGI become slightly corrupted, it may be necessary to rebuild
|
|
* the AG headers by using the rmap data to rummage through the AG looking for
|
|
* btree roots. This is not guaranteed to work if the AG is heavily damaged
|
|
* or the rmap data are corrupt.
|
|
*
|
|
* Callers of xrep_find_ag_btree_roots must lock the AGF and AGFL
|
|
* buffers if the AGF is being rebuilt; or the AGF and AGI buffers if the
|
|
* AGI is being rebuilt. It must maintain these locks until it's safe for
|
|
* other threads to change the btrees' shapes. The caller provides
|
|
* information about the btrees to look for by passing in an array of
|
|
* xrep_find_ag_btree with the (rmap owner, buf_ops, magic) fields set.
|
|
* The (root, height) fields will be set on return if anything is found. The
|
|
* last element of the array should have a NULL buf_ops to mark the end of the
|
|
* array.
|
|
*
|
|
* For every rmapbt record matching any of the rmap owners in btree_info,
|
|
* read each block referenced by the rmap record. If the block is a btree
|
|
* block from this filesystem matching any of the magic numbers and has a
|
|
* level higher than what we've already seen, remember the block and the
|
|
* height of the tree required to have such a block. When the call completes,
|
|
* we return the highest block we've found for each btree description; those
|
|
* should be the roots.
|
|
*/
|
|
|
|
struct xrep_findroot {
|
|
struct xfs_scrub *sc;
|
|
struct xfs_buf *agfl_bp;
|
|
struct xfs_agf *agf;
|
|
struct xrep_find_ag_btree *btree_info;
|
|
};
|
|
|
|
/* See if our block is in the AGFL. */
|
|
STATIC int
|
|
xrep_findroot_agfl_walk(
|
|
struct xfs_mount *mp,
|
|
xfs_agblock_t bno,
|
|
void *priv)
|
|
{
|
|
xfs_agblock_t *agbno = priv;
|
|
|
|
return (*agbno == bno) ? -ECANCELED : 0;
|
|
}
|
|
|
|
/* Does this block match the btree information passed in? */
|
|
STATIC int
|
|
xrep_findroot_block(
|
|
struct xrep_findroot *ri,
|
|
struct xrep_find_ag_btree *fab,
|
|
uint64_t owner,
|
|
xfs_agblock_t agbno,
|
|
bool *done_with_block)
|
|
{
|
|
struct xfs_mount *mp = ri->sc->mp;
|
|
struct xfs_buf *bp;
|
|
struct xfs_btree_block *btblock;
|
|
xfs_daddr_t daddr;
|
|
int block_level;
|
|
int error = 0;
|
|
|
|
daddr = XFS_AGB_TO_DADDR(mp, ri->sc->sa.pag->pag_agno, agbno);
|
|
|
|
/*
|
|
* Blocks in the AGFL have stale contents that might just happen to
|
|
* have a matching magic and uuid. We don't want to pull these blocks
|
|
* in as part of a tree root, so we have to filter out the AGFL stuff
|
|
* here. If the AGFL looks insane we'll just refuse to repair.
|
|
*/
|
|
if (owner == XFS_RMAP_OWN_AG) {
|
|
error = xfs_agfl_walk(mp, ri->agf, ri->agfl_bp,
|
|
xrep_findroot_agfl_walk, &agbno);
|
|
if (error == -ECANCELED)
|
|
return 0;
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Read the buffer into memory so that we can see if it's a match for
|
|
* our btree type. We have no clue if it is beforehand, and we want to
|
|
* avoid xfs_trans_read_buf's behavior of dumping the DONE state (which
|
|
* will cause needless disk reads in subsequent calls to this function)
|
|
* and logging metadata verifier failures.
|
|
*
|
|
* Therefore, pass in NULL buffer ops. If the buffer was already in
|
|
* memory from some other caller it will already have b_ops assigned.
|
|
* If it was in memory from a previous unsuccessful findroot_block
|
|
* call, the buffer won't have b_ops but it should be clean and ready
|
|
* for us to try to verify if the read call succeeds. The same applies
|
|
* if the buffer wasn't in memory at all.
|
|
*
|
|
* Note: If we never match a btree type with this buffer, it will be
|
|
* left in memory with NULL b_ops. This shouldn't be a problem unless
|
|
* the buffer gets written.
|
|
*/
|
|
error = xfs_trans_read_buf(mp, ri->sc->tp, mp->m_ddev_targp, daddr,
|
|
mp->m_bsize, 0, &bp, NULL);
|
|
if (error)
|
|
return error;
|
|
|
|
/* Ensure the block magic matches the btree type we're looking for. */
|
|
btblock = XFS_BUF_TO_BLOCK(bp);
|
|
ASSERT(fab->buf_ops->magic[1] != 0);
|
|
if (btblock->bb_magic != fab->buf_ops->magic[1])
|
|
goto out;
|
|
|
|
/*
|
|
* If the buffer already has ops applied and they're not the ones for
|
|
* this btree type, we know this block doesn't match the btree and we
|
|
* can bail out.
|
|
*
|
|
* If the buffer ops match ours, someone else has already validated
|
|
* the block for us, so we can move on to checking if this is a root
|
|
* block candidate.
|
|
*
|
|
* If the buffer does not have ops, nobody has successfully validated
|
|
* the contents and the buffer cannot be dirty. If the magic, uuid,
|
|
* and structure match this btree type then we'll move on to checking
|
|
* if it's a root block candidate. If there is no match, bail out.
|
|
*/
|
|
if (bp->b_ops) {
|
|
if (bp->b_ops != fab->buf_ops)
|
|
goto out;
|
|
} else {
|
|
ASSERT(!xfs_trans_buf_is_dirty(bp));
|
|
if (!uuid_equal(&btblock->bb_u.s.bb_uuid,
|
|
&mp->m_sb.sb_meta_uuid))
|
|
goto out;
|
|
/*
|
|
* Read verifiers can reference b_ops, so we set the pointer
|
|
* here. If the verifier fails we'll reset the buffer state
|
|
* to what it was before we touched the buffer.
|
|
*/
|
|
bp->b_ops = fab->buf_ops;
|
|
fab->buf_ops->verify_read(bp);
|
|
if (bp->b_error) {
|
|
bp->b_ops = NULL;
|
|
bp->b_error = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Some read verifiers will (re)set b_ops, so we must be
|
|
* careful not to change b_ops after running the verifier.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* This block passes the magic/uuid and verifier tests for this btree
|
|
* type. We don't need the caller to try the other tree types.
|
|
*/
|
|
*done_with_block = true;
|
|
|
|
/*
|
|
* Compare this btree block's level to the height of the current
|
|
* candidate root block.
|
|
*
|
|
* If the level matches the root we found previously, throw away both
|
|
* blocks because there can't be two candidate roots.
|
|
*
|
|
* If level is lower in the tree than the root we found previously,
|
|
* ignore this block.
|
|
*/
|
|
block_level = xfs_btree_get_level(btblock);
|
|
if (block_level + 1 == fab->height) {
|
|
fab->root = NULLAGBLOCK;
|
|
goto out;
|
|
} else if (block_level < fab->height) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* This is the highest block in the tree that we've found so far.
|
|
* Update the btree height to reflect what we've learned from this
|
|
* block.
|
|
*/
|
|
fab->height = block_level + 1;
|
|
|
|
/*
|
|
* If this block doesn't have sibling pointers, then it's the new root
|
|
* block candidate. Otherwise, the root will be found farther up the
|
|
* tree.
|
|
*/
|
|
if (btblock->bb_u.s.bb_leftsib == cpu_to_be32(NULLAGBLOCK) &&
|
|
btblock->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK))
|
|
fab->root = agbno;
|
|
else
|
|
fab->root = NULLAGBLOCK;
|
|
|
|
trace_xrep_findroot_block(mp, ri->sc->sa.pag->pag_agno, agbno,
|
|
be32_to_cpu(btblock->bb_magic), fab->height - 1);
|
|
out:
|
|
xfs_trans_brelse(ri->sc->tp, bp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Do any of the blocks in this rmap record match one of the btrees we're
|
|
* looking for?
|
|
*/
|
|
STATIC int
|
|
xrep_findroot_rmap(
|
|
struct xfs_btree_cur *cur,
|
|
const struct xfs_rmap_irec *rec,
|
|
void *priv)
|
|
{
|
|
struct xrep_findroot *ri = priv;
|
|
struct xrep_find_ag_btree *fab;
|
|
xfs_agblock_t b;
|
|
bool done;
|
|
int error = 0;
|
|
|
|
/* Ignore anything that isn't AG metadata. */
|
|
if (!XFS_RMAP_NON_INODE_OWNER(rec->rm_owner))
|
|
return 0;
|
|
|
|
/* Otherwise scan each block + btree type. */
|
|
for (b = 0; b < rec->rm_blockcount; b++) {
|
|
done = false;
|
|
for (fab = ri->btree_info; fab->buf_ops; fab++) {
|
|
if (rec->rm_owner != fab->rmap_owner)
|
|
continue;
|
|
error = xrep_findroot_block(ri, fab,
|
|
rec->rm_owner, rec->rm_startblock + b,
|
|
&done);
|
|
if (error)
|
|
return error;
|
|
if (done)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Find the roots of the per-AG btrees described in btree_info. */
|
|
int
|
|
xrep_find_ag_btree_roots(
|
|
struct xfs_scrub *sc,
|
|
struct xfs_buf *agf_bp,
|
|
struct xrep_find_ag_btree *btree_info,
|
|
struct xfs_buf *agfl_bp)
|
|
{
|
|
struct xfs_mount *mp = sc->mp;
|
|
struct xrep_findroot ri;
|
|
struct xrep_find_ag_btree *fab;
|
|
struct xfs_btree_cur *cur;
|
|
int error;
|
|
|
|
ASSERT(xfs_buf_islocked(agf_bp));
|
|
ASSERT(agfl_bp == NULL || xfs_buf_islocked(agfl_bp));
|
|
|
|
ri.sc = sc;
|
|
ri.btree_info = btree_info;
|
|
ri.agf = agf_bp->b_addr;
|
|
ri.agfl_bp = agfl_bp;
|
|
for (fab = btree_info; fab->buf_ops; fab++) {
|
|
ASSERT(agfl_bp || fab->rmap_owner != XFS_RMAP_OWN_AG);
|
|
ASSERT(XFS_RMAP_NON_INODE_OWNER(fab->rmap_owner));
|
|
fab->root = NULLAGBLOCK;
|
|
fab->height = 0;
|
|
}
|
|
|
|
cur = xfs_rmapbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.pag);
|
|
error = xfs_rmap_query_all(cur, xrep_findroot_rmap, &ri);
|
|
xfs_btree_del_cursor(cur, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
/* Force a quotacheck the next time we mount. */
|
|
void
|
|
xrep_force_quotacheck(
|
|
struct xfs_scrub *sc,
|
|
xfs_dqtype_t type)
|
|
{
|
|
uint flag;
|
|
|
|
flag = xfs_quota_chkd_flag(type);
|
|
if (!(flag & sc->mp->m_qflags))
|
|
return;
|
|
|
|
mutex_lock(&sc->mp->m_quotainfo->qi_quotaofflock);
|
|
sc->mp->m_qflags &= ~flag;
|
|
spin_lock(&sc->mp->m_sb_lock);
|
|
sc->mp->m_sb.sb_qflags &= ~flag;
|
|
spin_unlock(&sc->mp->m_sb_lock);
|
|
xfs_log_sb(sc->tp);
|
|
mutex_unlock(&sc->mp->m_quotainfo->qi_quotaofflock);
|
|
}
|
|
|
|
/*
|
|
* Attach dquots to this inode, or schedule quotacheck to fix them.
|
|
*
|
|
* This function ensures that the appropriate dquots are attached to an inode.
|
|
* We cannot allow the dquot code to allocate an on-disk dquot block here
|
|
* because we're already in transaction context with the inode locked. The
|
|
* on-disk dquot should already exist anyway. If the quota code signals
|
|
* corruption or missing quota information, schedule quotacheck, which will
|
|
* repair corruptions in the quota metadata.
|
|
*/
|
|
int
|
|
xrep_ino_dqattach(
|
|
struct xfs_scrub *sc)
|
|
{
|
|
int error;
|
|
|
|
error = xfs_qm_dqattach_locked(sc->ip, false);
|
|
switch (error) {
|
|
case -EFSBADCRC:
|
|
case -EFSCORRUPTED:
|
|
case -ENOENT:
|
|
xfs_err_ratelimited(sc->mp,
|
|
"inode %llu repair encountered quota error %d, quotacheck forced.",
|
|
(unsigned long long)sc->ip->i_ino, error);
|
|
if (XFS_IS_UQUOTA_ON(sc->mp) && !sc->ip->i_udquot)
|
|
xrep_force_quotacheck(sc, XFS_DQTYPE_USER);
|
|
if (XFS_IS_GQUOTA_ON(sc->mp) && !sc->ip->i_gdquot)
|
|
xrep_force_quotacheck(sc, XFS_DQTYPE_GROUP);
|
|
if (XFS_IS_PQUOTA_ON(sc->mp) && !sc->ip->i_pdquot)
|
|
xrep_force_quotacheck(sc, XFS_DQTYPE_PROJ);
|
|
fallthrough;
|
|
case -ESRCH:
|
|
error = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
}
|