drbd_rs_should_slow_down
bool throttle = drbd_rs_should_slow_down(peer_device, sector, true);
extern bool drbd_rs_should_slow_down(struct drbd_peer_device *peer_device, sector_t sector,
update_receiver_timing_details(connection, drbd_rs_should_slow_down);
&& drbd_rs_should_slow_down(peer_device, sector, false))