[patch added to 3.12-stable] NFSv4: Ensure nfs_atomic_open set the dentry verifier on ENOENT

From: Trond Myklebust <redacted>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit 809fd143de8805970eec02c27c0bc2622a6ecbda upstream.

If the OPEN rpc call to the server fails with an ENOENT call, nfs_atomic_open
will create a negative dentry for that file, however it currently fails
to call nfs_set_verifier(), thus causing the dentry to be immediately
revalidated on the next call to nfs_lookup_revalidate() instead of following
the usual lookup caching rules.

Signed-off-by: Trond Myklebust <redacted>
Signed-off-by: Jiri Slaby <redacted>
---
 fs/nfs/dir.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index b9670301d7d3..24e6448b7c80 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c

@@ -1487,6 +1487,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 		switch (err) {
 		case -ENOENT:
 			d_add(dentry, NULL);
+			nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 			break;
 		case -EISDIR:
 		case -ENOTDIR:

-- 
2.11.0