fanotify: record old and new parent and name in FAN_RENAME event

In the special case of FAN_RENAME event, we record both the old
and new parent and name.

Link: https://lore.kernel.org/r/20211129201537.1932819-9-amir73il@gmail.com


Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>