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

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

diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index b1bd05ea66b2d42fae1fcc34d5ddb91ead15eed5..1ab28d9b612ac60d2b846c2bfd329ce2416dacf8 100644 (file)
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -592,3 +592,7 @@ in your dentry operations instead.
        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.