Commit 4d559a3b introduced heavy prealloc. squashing to catch the case
of requesting too large a prealloc on smaller filesystems, leading to
repeated flush and retry cycles that occur on ENOSPC. Now that we issue
eofblocks scans on EDQUOT/ENOSPC (with a selective flush in the case of
project quotas), squash the prealloc against the minimum available free
space across all applicable quotas as well to avoid a similar problem of
repeated eofblocks scans.
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
fs/xfs/xfs_iomap.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 22d1cbe..934983a 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -401,7 +401,8 @@ xfs_quota_calc_throttle(
struct xfs_inode *ip,
int type,
xfs_fsblock_t *qblocks,
- int *qshift)
+ int *qshift,
+ int64_t *qfreesp)
{
int64_t freesp;
int shift = 0;
@@ -410,6 +411,7 @@ xfs_quota_calc_throttle(
/* over hi wmark, squash the prealloc completely */
if (dq->q_res_bcount >= dq->q_prealloc_hi_wmark) {
*qblocks = 0;
+ *qfreesp = 0;
return;
}
@@ -422,6 +424,9 @@ xfs_quota_calc_throttle(
shift += 2;
}
+ if (freesp < *qfreesp)
+ *qfreesp = freesp;
+
/* only overwrite the throttle values if we are more aggressive */
if ((freesp >> shift) < (*qblocks >> *qshift)) {
*qblocks = freesp;
@@ -480,15 +485,18 @@ xfs_iomap_prealloc_size(
}
/*
- * Check each quota to cap the prealloc size and provide a shift
- * value to throttle with.
+ * Check each quota to cap the prealloc size, provide a shift value to
+ * throttle with and adjust amount of available space.
*/
if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks))
- xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift);
+ xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift,
+ &freesp);
if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks))
- xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift);
+ xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift,
+ &freesp);
if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks))
- xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift);
+ xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift,
+ &freesp);
/*
* The final prealloc size is set to the minimum of free space available
--
1.8.3.1
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