[PATCH 3.10 106/268] NFSv4: Ensure nfs_atomic_open set the dentry verifier on ENOENT

From: Willy Tarreau
Date: Mon Jun 19 2017 - 15:34:49 EST

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

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.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
fs/nfs/dir.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e093e73..48038e7 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1435,6 +1435,7 @@ 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));
case -EISDIR:
case -ENOTDIR: