orangefs: Implement inode_operations->permission().

Thus d_revalidate is not obliged to check on as much, which will
eventually lead the way to hammering the filesystem servers much less.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
diff --git a/fs/orangefs/symlink.c b/fs/orangefs/symlink.c
index 1b3ae63..2b8541a 100644
--- a/fs/orangefs/symlink.c
+++ b/fs/orangefs/symlink.c
@@ -28,4 +28,5 @@
 	.getattr = orangefs_getattr,
 	.listxattr = orangefs_listxattr,
 	.setxattr = generic_setxattr,
+	.permission = orangefs_permission,
 };