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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2020-2024 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_inode.h"
#include "xfs_quota.h"
#include "xfs_qm.h"
#include "xfs_icache.h"
#include "xfs_bmap_util.h"
#include "xfs_iwalk.h"
#include "xfs_ialloc.h"
#include "xfs_sb.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/repair.h"
#include "scrub/xfile.h"
#include "scrub/xfarray.h"
#include "scrub/iscan.h"
#include "scrub/quota.h"
#include "scrub/quotacheck.h"
#include "scrub/trace.h"
/*
* Live Quotacheck Repair
* ======================
*
* Use the live quota counter information that we collected to replace the
* counter values in the incore dquots. A scrub->repair cycle should have left
* the live data and hooks active, so this is safe so long as we make sure the
* dquot is locked.
*/
/* Commit new counters to a dquot. */
static int
xqcheck_commit_dquot(
struct xqcheck *xqc,
xfs_dqtype_t dqtype,
struct xfs_dquot *dq)
{
struct xqcheck_dquot xcdq;
struct xfarray *counts = xqcheck_counters_for(xqc, dqtype);
int64_t delta;
bool dirty = false;
int error = 0;
/* Unlock the dquot just long enough to allocate a transaction. */
xfs_dqunlock(dq);
error = xchk_trans_alloc(xqc->sc, 0);
xfs_dqlock(dq);
if (error)
return error;
xfs_trans_dqjoin(xqc->sc->tp, dq);
if (xchk_iscan_aborted(&xqc->iscan)) {
error = -ECANCELED;
goto out_cancel;
}
mutex_lock(&xqc->lock);
error = xfarray_load_sparse(counts, dq->q_id, &xcdq);
if (error)
goto out_unlock;
/* Adjust counters as needed. */
delta = (int64_t)xcdq.icount - dq->q_ino.count;
if (delta) {
dq->q_ino.reserved += delta;
dq->q_ino.count += delta;
dirty = true;
}
delta = (int64_t)xcdq.bcount - dq->q_blk.count;
if (delta) {
dq->q_blk.reserved += delta;
dq->q_blk.count += delta;
dirty = true;
}
delta = (int64_t)xcdq.rtbcount - dq->q_rtb.count;
if (delta) {
dq->q_rtb.reserved += delta;
dq->q_rtb.count += delta;
dirty = true;
}
xcdq.flags |= (XQCHECK_DQUOT_REPAIR_SCANNED | XQCHECK_DQUOT_WRITTEN);
error = xfarray_store(counts, dq->q_id, &xcdq);
if (error == -EFBIG) {
/*
* EFBIG means we tried to store data at too high a byte offset
* in the sparse array. IOWs, we cannot complete the repair
* and must cancel the whole operation. This should never
* happen, but we need to catch it anyway.
*/
error = -ECANCELED;
}
mutex_unlock(&xqc->lock);
if (error || !dirty)
goto out_cancel;
trace_xrep_quotacheck_dquot(xqc->sc->mp, dq->q_type, dq->q_id);
/* Commit the dirty dquot to disk. */
dq->q_flags |= XFS_DQFLAG_DIRTY;
if (dq->q_id)
xfs_qm_adjust_dqtimers(dq);
xfs_trans_log_dquot(xqc->sc->tp, dq);
/*
* Transaction commit unlocks the dquot, so we must re-lock it so that
* the caller can put the reference (which apparently requires a locked
* dquot).
*/
error = xrep_trans_commit(xqc->sc);
xfs_dqlock(dq);
return error;
out_unlock:
mutex_unlock(&xqc->lock);
out_cancel:
xchk_trans_cancel(xqc->sc);
/* Re-lock the dquot so the caller can put the reference. */
xfs_dqlock(dq);
return error;
}
/* Commit new quota counters for a particular quota type. */
STATIC int
xqcheck_commit_dqtype(
struct xqcheck *xqc,
unsigned int dqtype)
{
struct xchk_dqiter cursor = { };
struct xqcheck_dquot xcdq;
struct xfs_scrub *sc = xqc->sc;
struct xfs_mount *mp = sc->mp;
struct xfarray *counts = xqcheck_counters_for(xqc, dqtype);
struct xfs_dquot *dq;
xfarray_idx_t cur = XFARRAY_CURSOR_INIT;
int error;
/*
* Update the counters of every dquot that the quota file knows about.
*/
xchk_dqiter_init(&cursor, sc, dqtype);
while ((error = xchk_dquot_iter(&cursor, &dq)) == 1) {
error = xqcheck_commit_dquot(xqc, dqtype, dq);
xfs_qm_dqput(dq);
if (error)
break;
}
if (error)
return error;
/*
* Make a second pass to deal with the dquots that we know about but
* the quota file previously did not know about.
*/
mutex_lock(&xqc->lock);
while ((error = xfarray_iter(counts, &cur, &xcdq)) == 1) {
xfs_dqid_t id = cur - 1;
if (xcdq.flags & XQCHECK_DQUOT_REPAIR_SCANNED)
continue;
mutex_unlock(&xqc->lock);
/*
* Grab the dquot, allowing for dquot block allocation in a
* separate transaction. We committed the scrub transaction
* in a previous step, so we will not be creating nested
* transactions here.
*/
error = xfs_qm_dqget(mp, id, dqtype, true, &dq);
if (error)
return error;
error = xqcheck_commit_dquot(xqc, dqtype, dq);
xfs_qm_dqput(dq);
if (error)
return error;
mutex_lock(&xqc->lock);
}
mutex_unlock(&xqc->lock);
return error;
}
/* Figure out quota CHKD flags for the running quota types. */
static inline unsigned int
xqcheck_chkd_flags(
struct xfs_mount *mp)
{
unsigned int ret = 0;
if (XFS_IS_UQUOTA_ON(mp))
ret |= XFS_UQUOTA_CHKD;
if (XFS_IS_GQUOTA_ON(mp))
ret |= XFS_GQUOTA_CHKD;
if (XFS_IS_PQUOTA_ON(mp))
ret |= XFS_PQUOTA_CHKD;
return ret;
}
/* Commit the new dquot counters. */
int
xrep_quotacheck(
struct xfs_scrub *sc)
{
struct xqcheck *xqc = sc->buf;
unsigned int qflags = xqcheck_chkd_flags(sc->mp);
int error;
/*
* Clear the CHKD flag for the running quota types and commit the scrub
* transaction so that we can allocate new quota block mappings if we
* have to. If we crash after this point, the sb still has the CHKD
* flags cleared, so mount quotacheck will fix all of this up.
*/
xrep_update_qflags(sc, qflags, 0);
error = xrep_trans_commit(sc);
if (error)
return error;
/* Commit the new counters to the dquots. */
if (xqc->ucounts) {
error = xqcheck_commit_dqtype(xqc, XFS_DQTYPE_USER);
if (error)
return error;
}
if (xqc->gcounts) {
error = xqcheck_commit_dqtype(xqc, XFS_DQTYPE_GROUP);
if (error)
return error;
}
if (xqc->pcounts) {
error = xqcheck_commit_dqtype(xqc, XFS_DQTYPE_PROJ);
if (error)
return error;
}
/* Set the CHKD flags now that we've fixed quota counts. */
error = xchk_trans_alloc(sc, 0);
if (error)
return error;
xrep_update_qflags(sc, 0, qflags);
return xrep_trans_commit(sc);
}
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