xfs: repair dquots based on live quotacheck resultsrepair-quota_2021-08-25

Use the shadow quota counters that live quotacheck creates to reset the
incore dquot counters.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

5 files changed, 257 insertions, 1 deletions

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 81ae812a6831..c6252ac30e0b 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -182,6 +182,7 @@ xfs-y				+= $(addprefix scrub/, \
 
 xfs-$(CONFIG_XFS_QUOTA)		+= $(addprefix scrub/, \
 				   quota_repair.o \
+				   quotacheck_repair.o \
 				   )
 
 endif
diff --git a/fs/xfs/scrub/quotacheck_repair.c b/fs/xfs/scrub/quotacheck_repair.c
new file mode 100644
index 000000000000..5b888bdf557d
--- /dev/null
+++ b/fs/xfs/scrub/quotacheck_repair.c
@@ -0,0 +1,251 @@
+// 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;
+}
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index 373473aea018..a0958ca608d5 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -88,8 +88,10 @@ int xrep_symlink(struct xfs_scrub *sc);
 
 #ifdef CONFIG_XFS_QUOTA
 int xrep_quota(struct xfs_scrub *sc);
+int xrep_quotacheck(struct xfs_scrub *sc);
 #else
 # define xrep_quota			xrep_notsupported
+# define xrep_quotacheck		xrep_notsupported
 #endif /* CONFIG_XFS_QUOTA */
 
 struct xrep_newbt_resv {
@@ -194,6 +196,7 @@ xrep_reset_perag_resv(
 #define xrep_bmap_attr			xrep_notsupported
 #define xrep_symlink			xrep_notsupported
 #define xrep_quota			xrep_notsupported
+#define xrep_quotacheck			xrep_notsupported
 
 #endif /* CONFIG_XFS_ONLINE_REPAIR */
 
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index b48a3aae7e47..0f89fb3c7d19 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -356,7 +356,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
 		.type	= ST_FS,
 		.setup	= xchk_setup_quotacheck,
 		.scrub	= xchk_quotacheck,
-		.repair	= xrep_notsupported,
+		.repair	= xrep_quotacheck,
 	},
 };
 
diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h
index bf279d48aa19..a352f8ea7b00 100644
--- a/fs/xfs/scrub/trace.h
+++ b/fs/xfs/scrub/trace.h
@@ -1366,6 +1366,7 @@ DEFINE_EVENT(xrep_dquot_class, name, \
 	TP_ARGS(mp, type, id))
 DEFINE_XREP_DQUOT_EVENT(xrep_dquot_item);
 DEFINE_XREP_DQUOT_EVENT(xrep_disk_dquot);
+DEFINE_XREP_DQUOT_EVENT(xrep_quotacheck_dquot);
 
 #endif /* IS_ENABLED(CONFIG_XFS_ONLINE_REPAIR) */