NFS: Micro-optimisation for nfs_wb_page()

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 966b8db99ac5..fab214a4bcb0 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1516,6 +1516,8 @@ int nfs_wb_page_priority(struct inode *inode, struct page *page, int how)
                 if (ret < 0)
                         goto out;
         }
+        if (!PagePrivate(page))
+                return 0;
         ret = nfs_sync_mapping_wait(page->mapping, &wbc, how);
         if (ret >= 0)
                 return 0;