xfs: flush delayed allcoation blocks on ENOSPC in create

If we are creating lots of small files, we can fail to get
a reservation for inode create earlier than we should due to
EOF preallocation done during delayed allocation reservation.
Hence on the first reservation ENOSPC failure flush all the
delayed allocation blocks out of the system and retry.

This fixes the last commonly triggered spurious ENOSPC issue
that has been reported.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 7394c7af5de5..19cf90a9c762 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -1457,6 +1457,13 @@ xfs_create(
         error = xfs_trans_reserve(tp, resblks, log_res, 0,
                         XFS_TRANS_PERM_LOG_RES, log_count);
         if (error == ENOSPC) {
+                /* flush outstanding delalloc blocks and retry */
+                xfs_flush_inodes(dp);
+                error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0,
+                        XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
+        }
+        if (error == ENOSPC) {
+                /* No space at all so try a "no-allocation" reservation */
                 resblks = 0;
                 error = xfs_trans_reserve(tp, 0, log_res, 0,
                                 XFS_TRANS_PERM_LOG_RES, log_count);