[PATCH 21/26] xfs: refactor xfs_qm_scall_setqlim

Darrick J. Wong
2020-07-15T01:55:02Z

Now that we can pass around quota resource and limit structures, clean
up the open-coded field setting in xfs_qm_scall_setqlim.

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: Chandan Babu R <chandanrlinux@gmail.com>
---
fs/xfs/xfs_qm_syscalls.c | 164 ++++++++++++++++++++++++++--------------------
1 file changed, 93 insertions(+), 71 deletions(-)

diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index aea4be4da424..4f06d2dc18d0 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -436,6 +436,58 @@ xfs_qm_scall_quotaon(
#define XFS_QC_MASK \
(QC_LIMIT_MASK | QC_TIMER_MASK | QC_WARNS_MASK)

+/*
+ * Adjust limits of this quota, and the defaults if passed in. Returns true
+ * if the new limits made sense and were applied, false otherwise.
+ */
+static inline bool
+xfs_setqlim_limits(
+ struct xfs_mount *mp,
+ struct xfs_dquot_res *res,
+ struct xfs_quota_limits *qlim,
+ xfs_qcnt_t hard,
+ xfs_qcnt_t soft,
+ const char *tag)
+{
+ /* The hard limit can't be less than the soft limit. */
+ if (hard != 0 && hard < soft) {
+ xfs_debug(mp, "%shard %lld < %ssoft %lld", tag, hard, tag,
+ soft);
+ return false;
+ }
+
+ res->hardlimit = hard;
+ res->softlimit = soft;
+ if (qlim) {
+ qlim->hard = hard;
+ qlim->soft = soft;
+ }
+
+ return true;
+}
+
+static inline void
+xfs_setqlim_warns(
+ struct xfs_dquot_res *res,
+ struct xfs_quota_limits *qlim,
+ int warns)
+{
+ res->warnings = warns;
+ if (qlim)
+ qlim->warn = warns;
+}
+
+static inline void
+xfs_setqlim_timer(
+ struct xfs_dquot_res *res,
+ struct xfs_quota_limits *qlim,
+ s64 timer)
+{
+ res->timer = timer;
+ if (qlim)
+ qlim->time = timer;
+}
+
/*
* Adjust quota limits, and start/stop timers accordingly.
*/
@@ -450,6 +502,8 @@ xfs_qm_scall_setqlim(
struct xfs_dquot *dqp;
struct xfs_trans *tp;
struct xfs_def_quota *defq;
+ struct xfs_dquot_res *res;
+ struct xfs_quota_limits *qlim;
int error;
xfs_qcnt_t hard, soft;

@@ -489,102 +543,70 @@ xfs_qm_scall_setqlim(
xfs_trans_dqjoin(tp, dqp);

/*
+ * Update quota limits, warnings, and timers, and the defaults
+ * if we're touching id == 0.
+ *
* Make sure that hardlimits are >= soft limits before changing.
+ *
+ * Update warnings counter(s) if requested.
+ *
+ * Timelimits for the super user set the relative time the other users
+ * can be over quota for this file system. If it is zero a default is
+ * used. Ditto for the default soft and hard limit values (already
+ * done, above), and for warnings.
+ *
+ * For other IDs, userspace can bump out the grace period if over
+ * the soft limit.
*/
+
+ /* Blocks on the data device. */
hard = (newlim->d_fieldmask & QC_SPC_HARD) ?
(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_hardlimit) :
dqp->q_blk.hardlimit;
soft = (newlim->d_fieldmask & QC_SPC_SOFT) ?
(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_softlimit) :
dqp->q_blk.softlimit;
- if (hard == 0 || hard >= soft) {
- dqp->q_blk.hardlimit = hard;
- dqp->q_blk.softlimit = soft;
+ res = &dqp->q_blk;
+ qlim = id == 0 ? &defq->blk : NULL;
+
+ if (xfs_setqlim_limits(mp, res, qlim, hard, soft, "blk"))
xfs_dquot_set_prealloc_limits(dqp);
- if (id == 0) {
- defq->blk.hard = hard;
- defq->blk.soft = soft;
- }
- } else {
- xfs_debug(mp, "blkhard %Ld < blksoft %Ld", hard, soft);
- }
+ 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);
+
+ /* Blocks on the realtime device. */
hard = (newlim->d_fieldmask & QC_RT_SPC_HARD) ?
(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_hardlimit) :
dqp->q_rtb.hardlimit;
soft = (newlim->d_fieldmask & QC_RT_SPC_SOFT) ?
(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_softlimit) :
dqp->q_rtb.softlimit;
- if (hard == 0 || hard >= soft) {
- dqp->q_rtb.hardlimit = hard;
- dqp->q_rtb.softlimit = soft;
- if (id == 0) {
- defq->rtb.hard = hard;
- defq->rtb.soft = soft;
- }
- } else {
- xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld", hard, soft);
- }
+ res = &dqp->q_rtb;
+ qlim = id == 0 ? &defq->rtb : NULL;

+ xfs_setqlim_limits(mp, res, qlim, hard, soft, "rtb");
+ 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);
+
+ /* Inodes */
hard = (newlim->d_fieldmask & QC_INO_HARD) ?
(xfs_qcnt_t) newlim->d_ino_hardlimit :
dqp->q_ino.hardlimit;
soft = (newlim->d_fieldmask & QC_INO_SOFT) ?
(xfs_qcnt_t) newlim->d_ino_softlimit :
dqp->q_ino.softlimit;
- if (hard == 0 || hard >= soft) {
- dqp->q_ino.hardlimit = hard;
- dqp->q_ino.softlimit = soft;
- if (id == 0) {
- defq->ino.hard = hard;
- defq->ino.soft = soft;
- }
- } else {
- xfs_debug(mp, "ihard %Ld < isoft %Ld", hard, soft);
- }
+ res = &dqp->q_ino;
+ qlim = id == 0 ? &defq->ino : NULL;

- /*
- * Update warnings counter(s) if requested
- */
- if (newlim->d_fieldmask & QC_SPC_WARNS)
- dqp->q_blk.warnings = newlim->d_spc_warns;
+ xfs_setqlim_limits(mp, res, qlim, hard, soft, "ino");
if (newlim->d_fieldmask & QC_INO_WARNS)
- dqp->q_ino.warnings = newlim->d_ino_warns;
- if (newlim->d_fieldmask & QC_RT_SPC_WARNS)
- dqp->q_rtb.warnings = newlim->d_rt_spc_warns;
-
- if (id == 0) {
- if (newlim->d_fieldmask & QC_SPC_WARNS)
- defq->blk.warn = newlim->d_spc_warns;
- if (newlim->d_fieldmask & QC_INO_WARNS)
- defq->ino.warn = newlim->d_ino_warns;
- if (newlim->d_fieldmask & QC_RT_SPC_WARNS)
- defq->rtb.warn = newlim->d_rt_spc_warns;
- }
-
- /*
- * Timelimits for the super user set the relative time the other users
- * can be over quota for this file system. If it is zero a default is
- * used. Ditto for the default soft and hard limit values (already
- * done, above), and for warnings.
- *
- * For other IDs, userspace can bump out the grace period if over
- * the soft limit.
- */
- if (newlim->d_fieldmask & QC_SPC_TIMER)
- dqp->q_blk.timer = newlim->d_spc_timer;
+ xfs_setqlim_warns(res, qlim, newlim->d_ino_warns);
if (newlim->d_fieldmask & QC_INO_TIMER)
- dqp->q_ino.timer = newlim->d_ino_timer;
- if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
- dqp->q_rtb.timer = newlim->d_rt_spc_timer;
-
- if (id == 0) {
- if (newlim->d_fieldmask & QC_SPC_TIMER)
- defq->blk.time = newlim->d_spc_timer;
- if (newlim->d_fieldmask & QC_INO_TIMER)
- defq->ino.time = newlim->d_ino_timer;
- if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
- defq->rtb.time = newlim->d_rt_spc_timer;
- }
+ xfs_setqlim_timer(res, qlim, newlim->d_ino_timer);

if (id != 0) {
/*