void md_write_start(mddev_t *mddev)
int md_write_start(mddev_t *mddev, struct bio *bi)
void md_write_start(mddev_t *mddev){	if (!atomic_read(&mddev->writes_pending)) {		mddev_lock_uninterruptible(mddev);		if (mddev->in_sync) {			mddev->in_sync = 0; 			del_timer(&mddev->safemode_timer);			md_update_sb(mddev);		}		atomic_inc(&mddev->writes_pending);		mddev_unlock(mddev);	} else		atomic_inc(&mddev->writes_pending);}