xfs: refactor quota expiration timer modification

Define explicit limits on the range of quota grace period expiration
timeouts and refactor the code that modifies the timeouts into helpers
that clamp the values appropriately.  Note that we'll refactor the
default grace period timer separately.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

6 files changed, 61 insertions, 9 deletions

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index e57360a8fd16..cb316053d3db 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1200,6 +1200,30 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
 #define XFS_DQTYPE_ANY		(XFS_DQTYPE_REC_MASK)
 
 /*
+ * XFS Quota Timers
+ * ================
+ *
+ * Traditional quota grace period expiration timers are an unsigned 32-bit
+ * seconds counter; time zero is the Unix epoch, Jan  1 00:00:01 UTC 1970.
+ * Note that an expiration value of zero means that the quota limit has not
+ * been reached, and therefore no expiration has been set.  Therefore, the
+ * ondisk min and max defined here can be used directly to constrain the incore
+ * quota expiration timestamps on a Unix system.
+ */
+
+/*
+ * Smallest possible ondisk quota expiration value with traditional timestamps.
+ * This corresponds exactly with the incore expiration Jan  1 00:00:01 UTC 1970.
+ */
+#define XFS_DQ_LEGACY_EXPIRY_MIN	((int64_t)1)
+
+/*
+ * Largest possible ondisk quota expiration value with traditional timestamps.
+ * This corresponds exactly with the incore expiration Feb  7 06:28:15 UTC 2106.
+ */
+#define XFS_DQ_LEGACY_EXPIRY_MAX	((int64_t)U32_MAX)
+
+/*
  * This is the main portion of the on-disk representation of quota information
  * for a user.  We pad this with some more expansion room to construct the on
  * disk structure.
diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 0dcd912befb1..efe8a71998fc 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -98,12 +98,25 @@ xfs_qm_adjust_dqlimits(
 		xfs_dquot_set_prealloc_limits(dq);
 }
 
+/* Set the expiration time of a quota's grace period. */
+time64_t
+xfs_dquot_set_timeout(
+	struct xfs_mount	*mp,
+	time64_t		timeout)
+{
+	struct xfs_quotainfo	*qi = mp->m_quotainfo;
+
+	return clamp_t(time64_t, timeout, qi->qi_expiry_min,
+					  qi->qi_expiry_max);
+}
+
 /*
  * Determine if this quota counter is over either limit and set the quota
  * timers as appropriate.
  */
 static inline void
 xfs_qm_adjust_res_timer(
+	struct xfs_mount	*mp,
 	struct xfs_dquot_res	*res,
 	struct xfs_quota_limits	*qlim)
 {
@@ -112,7 +125,8 @@ xfs_qm_adjust_res_timer(
 	if ((res->softlimit && res->count > res->softlimit) ||
 	    (res->hardlimit && res->count > res->hardlimit)) {
 		if (res->timer == 0)
-			res->timer = ktime_get_real_seconds() + qlim->time;
+			res->timer = xfs_dquot_set_timeout(mp,
+					ktime_get_real_seconds() + qlim->time);
 	} else {
 		if (res->timer == 0)
 			res->warnings = 0;
@@ -145,9 +159,9 @@ xfs_qm_adjust_dqtimers(
 	ASSERT(dq->q_id);
 	defq = xfs_get_defquota(qi, xfs_dquot_type(dq));
 
-	xfs_qm_adjust_res_timer(&dq->q_blk, &defq->blk);
-	xfs_qm_adjust_res_timer(&dq->q_ino, &defq->ino);
-	xfs_qm_adjust_res_timer(&dq->q_rtb, &defq->rtb);
+	xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_blk, &defq->blk);
+	xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_ino, &defq->ino);
+	xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_rtb, &defq->rtb);
 }
 
 /*
diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h
index 282a65da93c7..0e449101c861 100644
--- a/fs/xfs/xfs_dquot.h
+++ b/fs/xfs/xfs_dquot.h
@@ -237,4 +237,6 @@ typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq,
 int xfs_qm_dqiterate(struct xfs_mount *mp, xfs_dqtype_t type,
 		xfs_qm_dqiterate_fn iter_fn, void *priv);
 
+time64_t xfs_dquot_set_timeout(struct xfs_mount *mp, time64_t timeout);
+
 #endif /* __XFS_DQUOT_H__ */
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index be67570badf8..b83a12ecfc35 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -661,6 +661,8 @@ xfs_qm_init_quotainfo(
 	/* Precalc some constants */
 	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 	qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
+	qinf->qi_expiry_min = XFS_DQ_LEGACY_EXPIRY_MIN;
+	qinf->qi_expiry_max = XFS_DQ_LEGACY_EXPIRY_MAX;
 
 	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 
diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index 9c078c35d924..e3dabab44097 100644
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h
@@ -65,6 +65,10 @@ struct xfs_quotainfo {
 	struct xfs_def_quota	qi_grp_default;
 	struct xfs_def_quota	qi_prj_default;
 	struct shrinker		qi_shrinker;
+
+	/* Minimum and maximum quota expiration timestamp values. */
+	time64_t		qi_expiry_min;
+	time64_t		qi_expiry_max;
 };
 
 static inline struct radix_tree_root *
diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index 1c542b4a5220..750f775ae915 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -479,13 +479,19 @@ xfs_setqlim_warns(
 
 static inline void
 xfs_setqlim_timer(
+	struct xfs_mount	*mp,
 	struct xfs_dquot_res	*res,
 	struct xfs_quota_limits	*qlim,
 	s64			timer)
 {
-	res->timer = timer;
-	if (qlim)
+	if (qlim) {
+		/* Set the length of the default grace period. */
+		res->timer = timer;
 		qlim->time = timer;
+	} else {
+		/* Set the grace period expiration on a quota. */
+		res->timer = xfs_dquot_set_timeout(mp, timer);
+	}
 }
 
 /*
@@ -574,7 +580,7 @@ xfs_qm_scall_setqlim(
 	if (newlim->d_fieldmask & QC_SPC_WARNS)
 		xfs_setqlim_warns(res, qlim, newlim->d_spc_warns);
 	if (newlim->d_fieldmask & QC_SPC_TIMER)
-		xfs_setqlim_timer(res, qlim, newlim->d_spc_timer);
+		xfs_setqlim_timer(mp, res, qlim, newlim->d_spc_timer);
 
 	/* Blocks on the realtime device. */
 	hard = (newlim->d_fieldmask & QC_RT_SPC_HARD) ?
@@ -590,7 +596,7 @@ xfs_qm_scall_setqlim(
 	if (newlim->d_fieldmask & QC_RT_SPC_WARNS)
 		xfs_setqlim_warns(res, qlim, newlim->d_rt_spc_warns);
 	if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
-		xfs_setqlim_timer(res, qlim, newlim->d_rt_spc_timer);
+		xfs_setqlim_timer(mp, res, qlim, newlim->d_rt_spc_timer);
 
 	/* Inodes */
 	hard = (newlim->d_fieldmask & QC_INO_HARD) ?
@@ -606,7 +612,7 @@ xfs_qm_scall_setqlim(
 	if (newlim->d_fieldmask & QC_INO_WARNS)
 		xfs_setqlim_warns(res, qlim, newlim->d_ino_warns);
 	if (newlim->d_fieldmask & QC_INO_TIMER)
-		xfs_setqlim_timer(res, qlim, newlim->d_ino_timer);
+		xfs_setqlim_timer(mp, res, qlim, newlim->d_ino_timer);
 
 	if (id != 0) {
 		/*