vfs: add note about i_op->rename changes to porting

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

Documentation/filesystems/porting

diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index b1bd05e..1ab28d9 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -592,3 +592,7 @@
 	work just as well; if it's something more complicated, use dentry->d_parent.
 	Just be careful not to assume that fetching it more than once will yield
 	the same value - in RCU mode it could change under you.
+--
+[mandatory]
+	->rename() has an added flags argument.  Any flags not handled by the
+        filesystem should result in EINVAL being returned.