Esempio n. 1
0
/**
 * blk_release_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging to the request queue to be released
 *
 * Description:
 *     blk_release_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Note:
 *     The low level driver must have finished any outstanding requests first
 *     via blk_cleanup_queue().
 **/
static void blk_release_queue(struct kobject *kobj)
{
    struct request_queue *q =
        container_of(kobj, struct request_queue, kobj);

    blkcg_exit_queue(q);

    if (q->elevator) {
        spin_lock_irq(q->queue_lock);
        ioc_clear_queue(q);
        spin_unlock_irq(q->queue_lock);
        elevator_exit(q->elevator);
    }

    blk_exit_rl(&q->root_rl);

    if (q->queue_tags)
        __blk_queue_free_tags(q);

    kfree(q->flush_rq);

    blk_trace_shutdown(q);

    bdi_destroy(&q->backing_dev_info);

    ida_simple_remove(&blk_queue_ida, q->id);
    call_rcu(&q->rcu_head, blk_free_queue_rcu);
}
Esempio n. 2
0
/**
 * blk_release_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging to the request queue to be released
 *
 * Description:
 *     blk_release_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Note:
 *     The low level driver must have finished any outstanding requests first
 *     via blk_cleanup_queue().
 **/
static void blk_release_queue(struct kobject *kobj)
{
	struct request_queue *q =
		container_of(kobj, struct request_queue, kobj);

	blkcg_exit_queue(q);

	if (q->elevator) {
		spin_lock_irq(q->queue_lock);
		ioc_clear_queue(q);
		spin_unlock_irq(q->queue_lock);
		elevator_exit(q->elevator);
	}

	blk_exit_rl(&q->root_rl);

	if (q->queue_tags)
		__blk_queue_free_tags(q);

	if (!q->mq_ops)
		blk_free_flush_queue(q->fq);
	else
		blk_mq_release(q);

	blk_trace_shutdown(q);

	if (q->bio_split)
		bioset_free(q->bio_split);

	ida_simple_remove(&blk_queue_ida, q->id);
	call_rcu(&q->rcu_head, blk_free_queue_rcu);
}
Esempio n. 3
0
/**
 * blk_release_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging to the request queue to be released
 *
 * Description:
 *     blk_release_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Note:
 *     The low level driver must have finished any outstanding requests first
 *     via blk_cleanup_queue().
 **/
static void blk_release_queue(struct kobject *kobj)
{
	struct request_queue *q =
		container_of(kobj, struct request_queue, kobj);

	if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags))
		blk_stat_remove_callback(q, q->poll_cb);
	blk_stat_free_callback(q->poll_cb);
	bdi_put(q->backing_dev_info);
	blkcg_exit_queue(q);

	if (q->elevator) {
		ioc_clear_queue(q);
		elevator_exit(q, q->elevator);
	}

	blk_free_queue_stats(q->stats);

	blk_exit_rl(&q->root_rl);

	if (q->queue_tags)
		__blk_queue_free_tags(q);

	if (!q->mq_ops) {
		if (q->exit_rq_fn)
			q->exit_rq_fn(q, q->fq->flush_rq);
		blk_free_flush_queue(q->fq);
	} else {
		blk_mq_release(q);
	}

	blk_trace_shutdown(q);

	if (q->mq_ops)
		blk_mq_debugfs_unregister(q);

	if (q->bio_split)
		bioset_free(q->bio_split);

	ida_simple_remove(&blk_queue_ida, q->id);
	call_rcu(&q->rcu_head, blk_free_queue_rcu);
}
Esempio n. 4
0
/**
 * blk_cleanup_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging of the request queue to be released
 *
 * Description:
 *     blk_cleanup_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Caveat:
 *     Hopefully the low level driver will have finished any
 *     outstanding requests first...
 **/
static void blk_release_queue(struct kobject *kobj)
{
	struct request_queue *q =
		container_of(kobj, struct request_queue, kobj);

	blk_sync_queue(q);

	if (q->elevator)
		elevator_exit(q->elevator);

	blk_throtl_exit(q);

	blk_exit_rl(&q->root_rl);

	if (q->queue_tags)
		__blk_queue_free_tags(q);

	blk_throtl_release(q);
	blk_trace_shutdown(q);

	bdi_destroy(&q->backing_dev_info);
	kmem_cache_free(blk_requestq_cachep, q);
}