NFSv4: Don't attempt an atomic open if the file is a mountpoint

Fix https://bugzilla.kernel.org/show_bug.cgi?id=15789

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

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index be46f26c9a5616cc2181fa98b9d9b7157a2cd7ce..fbb4cf79a20ecc904157dee393f487d4fd2fc0ba 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1050,7 +1050,7 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
        struct inode *dir;
        int openflags, ret = 0;
 
-       if (!is_atomic_open(nd))
+       if (!is_atomic_open(nd) || d_mountpoint(dentry))
                goto no_open;
        parent = dget_parent(dentry);
        dir = parent->d_inode;