vdo_enqueue_completion
vdo_enqueue_completion(completion, VDO_WORK_Q_DEFAULT_PRIORITY);
vdo_enqueue_completion(completion, priority);
void vdo_enqueue_completion(struct vdo_completion *completion,
vdo_enqueue_completion(completion, VDO_DEFAULT_Q_MAP_BIO_PRIORITY);
vdo_enqueue_completion(completion, VDO_DEFAULT_Q_FLUSH_PRIORITY);
vdo_enqueue_completion(completion, BIO_Q_FLUSH_PRIORITY);
vdo_enqueue_completion(&vio->completion, VDO_WORK_Q_DEFAULT_PRIORITY);