[PATCH 03/11] xfs: refactor default quota grace period setting code

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Refactor the code that sets the default quota grace period into a helper
function so that we can override the ondisk behavior later.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_format.h |   13 +++++++++++++
 fs/xfs/xfs_dquot.c         |    9 +++++++++
 fs/xfs/xfs_dquot.h         |    1 +
 fs/xfs/xfs_ondisk.h        |    2 ++
 fs/xfs/xfs_qm_syscalls.c   |    4 ++--
 5 files changed, 27 insertions(+), 2 deletions(-)


diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index ef36978239ac..e9e6248b35be 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1205,6 +1205,11 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
  * time zero is the Unix epoch, Jan  1 00:00:01 UTC 1970.  An expiration value
  * of zero means that the quota limit has not been reached, and therefore no
  * expiration has been set.
+ *
+ * The grace period for each quota type is stored in the root dquot (id = 0)
+ * and is applied to a non-root dquot when it exceeds the soft or hard limits.
+ * The length of quota grace periods are unsigned 32-bit quantities measured in
+ * units of seconds.  A value of zero means to use the default period.
  */
 
 /*
@@ -1219,6 +1224,14 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
  */
 #define XFS_DQ_TIMEOUT_MAX	((int64_t)U32_MAX)
 
+/*
+ * Default quota grace periods, ranging from zero (use the compiled defaults)
+ * to ~136 years.  These are applied to a non-root dquot that has exceeded
+ * either limit.
+ */
+#define XFS_DQ_GRACE_MIN	((int64_t)0)
+#define XFS_DQ_GRACE_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
diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 2425b1c30d11..ed3fa6ada0d3 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -98,6 +98,15 @@ xfs_qm_adjust_dqlimits(
 		xfs_dquot_set_prealloc_limits(dq);
 }
 
+/* Set the length of the default grace period. */
+void
+xfs_dquot_set_grace_period(
+	time64_t		*timer,
+	time64_t		value)
+{
+	*timer = clamp_t(time64_t, value, XFS_DQ_GRACE_MIN, XFS_DQ_GRACE_MAX);
+}
+
 /* Set the expiration time of a quota's grace period. */
 void
 xfs_dquot_set_timeout(
diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h
index 11bd0ee9b0fa..0ba4d91c3a11 100644
--- a/fs/xfs/xfs_dquot.h
+++ b/fs/xfs/xfs_dquot.h
@@ -237,6 +237,7 @@ 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);
 
+void xfs_dquot_set_grace_period(time64_t *timer, time64_t limit);
 void xfs_dquot_set_timeout(time64_t *timer, time64_t limit);
 
 #endif /* __XFS_DQUOT_H__ */
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index 38ccffcf3336..498e9063c605 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -27,6 +27,8 @@ xfs_check_limits(void)
 	XFS_CHECK_VALUE(XFS_INO_TIME_MAX,			2147483647LL);
 	XFS_CHECK_VALUE(XFS_DQ_TIMEOUT_MIN,			1LL);
 	XFS_CHECK_VALUE(XFS_DQ_TIMEOUT_MAX,			4294967295LL);
+	XFS_CHECK_VALUE(XFS_DQ_GRACE_MIN,			0LL);
+	XFS_CHECK_VALUE(XFS_DQ_GRACE_MAX,			4294967295LL);
 }
 
 static inline void __init
diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index b16d533a6feb..95b0c25b9969 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -485,8 +485,8 @@ xfs_setqlim_timer(
 {
 	if (qlim) {
 		/* Set the length of the default grace period. */
-		res->timer = timer;
-		qlim->time = timer;
+		xfs_dquot_set_grace_period(&res->timer, timer);
+		qlim->time = res->timer;
 	} else {
 		/* Set the grace period expiration on a quota. */
 		xfs_dquot_set_timeout(&res->timer, timer);