[PATCH 3.12 195/235] NFSv4: Ensure nfs_atomic_open set the dentry verifier on ENOENT

[Jiri Slaby]

From: Trond Myklebust <trond.mykleb...@primarydata.com>

3.12-stable review patch.  If anyone has any objections, please let me 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 <trond.mykleb...@primarydata.com>
Signed-off-by: Jiri Slaby <jsl...@suse.cz>
---
 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