NFSv4: Force a post-op attribute update when holding a delegation

If the ctime or mtime or change attribute have changed because
of an operation we initiated, we should make sure that we force
an attribute update. However we do not want to mark the page cache
for revalidation.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org # v4.0+

fs/nfs/inode.c

@@ -1477,6 +1477,13 @@ static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr
 {
 	unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 
+	/*
+	 * Don't revalidate the pagecache if we hold a delegation, but do
+	 * force an attribute update
+	 */
+	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
+		invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_FORCED;
+
 	if (S_ISDIR(inode->i_mode))
 		invalid |= NFS_INO_INVALID_DATA;
 	nfs_set_cache_invalid(inode, invalid);