_tl_restart
_tl_restart(connection, what);
_tl_restart(connection, CONNECTION_LOST_WHILE_PENDING);
extern void _tl_restart(struct drbd_connection *connection, enum drbd_req_event what);
_tl_restart(connection, what);
_tl_restart(connection, RESEND);
_tl_restart(connection, CONNECTION_LOST_WHILE_PENDING);