From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Thu, 23 Oct 2014 16:33:14 +0000 (+0300)
Subject: NFSv4: Ensure nfs_atomic_open set the dentry verifier on ENOENT
X-Git-Tag: v3.10.107~165
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da39d112afd21b10d71dc09c6a4dd4dfd1f96dfe;p=thirdparty%2Fkernel%2Fstable.git

NFSv4: Ensure nfs_atomic_open set the dentry verifier on ENOENT

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@primarydata.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e093e73178b71..48038e7adb1ef 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));
 			break;
 		case -EISDIR:
 		case -ENOTDIR: