From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Thu, 22 Apr 2010 19:35:55 +0000 (-0400)
Subject: NFSv4: Don't attempt an atomic open if the file is a mountpoint
X-Git-Tag: firefly_0821_release~9833^2~2253^2~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1f063d2cdf332a8a5722006b1345d15d16007c6e;p=firefly-linux-kernel-4.4.55.git

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 be46f26c9a56..fbb4cf79a20e 100644
--- 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;