summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_dquot.c
diff options
context:
space:
mode:
authorBrian Foster <bfoster@redhat.com>2013-03-18 18:51:46 +0400
committerBen Myers <bpm@sgi.com>2013-03-23 01:06:30 +0400
commitb136645116e5471cf0b037a1759dc83620236631 (patch)
tree9b9bfaa822d88585f4fa670a10b8f54a09584372 /fs/xfs/xfs_dquot.c
parent4b6eae2e6ac8a6671839ccaea1c2e3dd5684f5df (diff)
downloadlinux-b136645116e5471cf0b037a1759dc83620236631.tar.xz
xfs: xfs_dquot prealloc throttling watermarks and low free space
Enable tracking of high and low watermarks for preallocation throttling of files under quota restrictions. These values are calculated when the quota limit is read from disk or modified and cached for later use by the throttling algorithm. The high watermark specifies when preallocation is disabled, the low watermark specifies when throttling is enabled and the low free space data structure contains precalculated low free space limits to serve as input to determine the level of throttling required. Note that the low free space data structure is based on the existing global low free space data structure with the exception of using three stages (5%, 3% and 1%) rather than five to reduce the impact of xfs_dquot memory overhead. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_dquot.c')
-rw-r--r--fs/xfs/xfs_dquot.c41
1 files changed, 39 insertions, 2 deletions
diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 9c5869e60f97..45bb08f6ba17 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -90,13 +90,18 @@ xfs_qm_adjust_dqlimits(
{
struct xfs_quotainfo *q = mp->m_quotainfo;
struct xfs_disk_dquot *d = &dq->q_core;
+ int prealloc = 0;
ASSERT(d->d_id);
- if (q->qi_bsoftlimit && !d->d_blk_softlimit)
+ if (q->qi_bsoftlimit && !d->d_blk_softlimit) {
d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
- if (q->qi_bhardlimit && !d->d_blk_hardlimit)
+ prealloc = 1;
+ }
+ if (q->qi_bhardlimit && !d->d_blk_hardlimit) {
d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
+ prealloc = 1;
+ }
if (q->qi_isoftlimit && !d->d_ino_softlimit)
d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
if (q->qi_ihardlimit && !d->d_ino_hardlimit)
@@ -105,6 +110,9 @@ xfs_qm_adjust_dqlimits(
d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
+
+ if (prealloc)
+ xfs_dquot_set_prealloc_limits(dq);
}
/*
@@ -249,6 +257,32 @@ xfs_qm_init_dquot_blk(
xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
}
+/*
+ * Initialize the dynamic speculative preallocation thresholds. The lo/hi
+ * watermarks correspond to the soft and hard limits by default. If a soft limit
+ * is not specified, we use 95% of the hard limit.
+ */
+void
+xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
+{
+ __uint64_t space;
+
+ dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
+ dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit);
+ if (!dqp->q_prealloc_lo_wmark) {
+ dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
+ do_div(dqp->q_prealloc_lo_wmark, 100);
+ dqp->q_prealloc_lo_wmark *= 95;
+ }
+
+ space = dqp->q_prealloc_hi_wmark;
+
+ do_div(space, 100);
+ dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
+ dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
+ dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
+}
+
static void
xfs_dquot_buf_verify(
struct xfs_buf *bp)
@@ -649,6 +683,9 @@ xfs_qm_dqread(
dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
+ /* initialize the dquot speculative prealloc thresholds */
+ xfs_dquot_set_prealloc_limits(dqp);
+
/* Mark the buf so that this will stay incore a little longer */
xfs_buf_set_ref(bp, XFS_DQUOT_REF);