NFS: Do cleanup before resetting pageio read/write to mds

There is a reference leak of layout segment after resetting
pageio read/write to mds.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Cc: stable@vger.kernel.org # v4.0+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 388f48079c43..72624dc4a623 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1351,6 +1351,9 @@ void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
 {
         struct nfs_pgio_mirror *mirror;
 
+        if (pgio->pg_ops && pgio->pg_ops->pg_cleanup)
+                pgio->pg_ops->pg_cleanup(pgio);
+
         pgio->pg_ops = &nfs_pgio_rw_ops;
 
         nfs_pageio_stop_mirroring(pgio);