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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2021 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/array.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 xfs_dquot *dqp,
xfs_dqtype_t dqtype,
void *priv)
{
struct xqcheck_dquot xcdq;
struct xqcheck *xqc = priv;
struct xfbma *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(dqp);
error = xchk_trans_alloc(xqc->sc, 0);
xfs_dqlock(dqp);
if (error)
return error;
xfs_trans_dqjoin(xqc->sc->tp, dqp);
mutex_lock(&xqc->lock);
if (xqc->hook_dead) {
mutex_unlock(&xqc->lock);
xfs_trans_cancel(xqc->sc->tp);
error = -ECANCELED;
goto out;
}
error = xqcheck_get_shadow_dquot(counts, dqp->q_id, &xcdq);
if (error) {
mutex_unlock(&xqc->lock);
xfs_trans_cancel(xqc->sc->tp);
goto out;
}
/* Adjust counters as needed. */
delta = (int64_t)xcdq.icount - dqp->q_ino.count;
if (delta) {
dqp->q_ino.reserved += delta;
dqp->q_ino.count += delta;
dirty = true;
}
delta = (int64_t)xcdq.bcount - dqp->q_blk.count;
if (delta) {
dqp->q_blk.reserved += delta;
dqp->q_blk.count += delta;
dirty = true;
}
delta = (int64_t)xcdq.rtbcount - dqp->q_rtb.count;
if (delta) {
dqp->q_rtb.reserved += delta;
dqp->q_rtb.count += delta;
dirty = true;
}
mutex_unlock(&xqc->lock);
if (!dirty) {
xfs_trans_cancel(xqc->sc->tp);
goto out;
}
trace_xrep_quotacheck_dquot(xqc->sc->mp, dqp->q_type, dqp->q_id);
/* Commit the dirty dquot to disk. */
dqp->q_flags |= XFS_DQFLAG_DIRTY;
if (dqp->q_id)
xfs_qm_adjust_dqtimers(dqp);
xfs_trans_log_dquot(xqc->sc->tp, dqp);
error = xfs_trans_commit(xqc->sc->tp);
out:
xqc->sc->tp = NULL;
/*
* Transaction commit unlocks the dquot, so we must re-lock it so that
* the caller can put the reference (which apparently requires a locked
* dq...)
*/
xfs_dqlock(dqp);
return error;
}
/* Commit new quota counters for a particular quota type. */
STATIC int
xqcheck_commit_dqtype(
struct xqcheck *xqc,
unsigned int dqtype)
{
struct xqcheck_dquot xcdq;
struct xfs_scrub *sc = xqc->sc;
struct xfs_mount *mp = sc->mp;
struct xfbma *counts = xqcheck_counters_for(xqc, dqtype);
struct xfs_dquot *dqp;
uint64_t nr = 0;
int error;
/*
* Update the counters of every dquot that the quota file knows about.
*/
error = xfs_qm_dqiterate(mp, dqtype, xqcheck_commit_dquot, xqc);
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 = xfbma_iter_get(counts, &nr, &xcdq))) {
xfs_dqid_t id = nr - 1;
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, &dqp);
if (error)
return error;
error = xqcheck_commit_dquot(dqp, dqtype, xqc);
xfs_qm_dqput(dqp);
if (error)
return error;
mutex_lock(&xqc->lock);
}
mutex_unlock(&xqc->lock);
/* ENODATA means we hit the end of the array. */
if (error == -ENODATA)
return 0;
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 this quota type 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.
*/
spin_lock(&sc->mp->m_sb_lock);
sc->mp->m_qflags &= ~qflags;
sc->mp->m_sb.sb_qflags &= ~qflags;
spin_unlock(&sc->mp->m_sb_lock);
xfs_log_sb(sc->tp);
error = xfs_trans_commit(sc->tp);
sc->tp = NULL;
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;
}
/* Reinstate CHKD flags. */
error = xchk_trans_alloc(sc, 0);
if (error)
return error;
spin_lock(&sc->mp->m_sb_lock);
sc->mp->m_qflags |= qflags;
sc->mp->m_sb.sb_qflags |= qflags;
spin_unlock(&sc->mp->m_sb_lock);
xfs_log_sb(sc->tp);
return 0;
}
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