NFS: Try to commit unstable writes in nfs_release_page()

If someone calls nfs_release_page(), we presumably already know that the
page is clean, however it may be holding an unstable write.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 6b891328f332..63f2071d6445 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -486,6 +486,8 @@ static int nfs_release_page(struct page *page, gfp_t gfp)
 {
         dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
 
+        if (gfp & __GFP_WAIT)
+                nfs_wb_page(page->mapping->host, page);
         /* If PagePrivate() is set, then the page is not freeable */
         if (PagePrivate(page))
                 return 0;