コード例 #1
0
int blk_register_queue(struct gendisk *disk)
{
	int ret;
	struct device *dev = disk_to_dev(disk);
	struct request_queue *q = disk->queue;

	if (WARN_ON(!q))
		return -ENXIO;

	ret = blk_trace_init_sysfs(dev);
	if (ret)
		return ret;

	ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
	if (ret < 0) {
		blk_trace_remove_sysfs(dev);
		return ret;
	}

	kobject_uevent(&q->kobj, KOBJ_ADD);

	if (!q->request_fn)
		return 0;

	ret = elv_register_queue(q);
	if (ret) {
		kobject_uevent(&q->kobj, KOBJ_REMOVE);
		kobject_del(&q->kobj);
		blk_trace_remove_sysfs(dev);
		kobject_put(&dev->kobj);
		return ret;
	}

	return 0;
}
コード例 #2
0
ファイル: blk-sysfs.c プロジェクト: OneDonkeyKong/linux
int blk_register_queue(struct gendisk *disk)
{
	add_my_disk(disk);
	int ret;
	struct device *dev = disk_to_dev(disk);
	struct request_queue *q = disk->queue;

	if (WARN_ON(!q))
		return -ENXIO;

	/*
	 * SCSI probing may synchronously create and destroy a lot of
	 * request_queues for non-existent devices.  Shutting down a fully
	 * functional queue takes measureable wallclock time as RCU grace
	 * periods are involved.  To avoid excessive latency in these
	 * cases, a request_queue starts out in a degraded mode which is
	 * faster to shut down and is made fully functional here as
	 * request_queues for non-existent devices never get registered.
	 */
	if (!blk_queue_init_done(q)) {
		queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);
		blk_queue_bypass_end(q);
		if (q->mq_ops)
			blk_mq_finish_init(q);
	}

	ret = blk_trace_init_sysfs(dev);
	if (ret)
		return ret;

	ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
	if (ret < 0) {
		blk_trace_remove_sysfs(dev);
		return ret;
	}

	kobject_uevent(&q->kobj, KOBJ_ADD);

	if (q->mq_ops)
		blk_mq_register_disk(disk);

	if (!q->request_fn)
		return 0;

	ret = elv_register_queue(q);
	if (ret) {
		kobject_uevent(&q->kobj, KOBJ_REMOVE);
		kobject_del(&q->kobj);
		blk_trace_remove_sysfs(dev);
		kobject_put(&dev->kobj);
		return ret;
	}

	return 0;
}
コード例 #3
0
ファイル: blk-sysfs.c プロジェクト: gmujica/ubuntu-fixes
int blk_register_queue(struct gendisk *disk)
{
    int ret;
    struct device *dev = disk_to_dev(disk);
    struct request_queue *q = disk->queue;

    if (WARN_ON(!q))
        return -ENXIO;

    /*
     * Initialization must be complete by now.  Finish the initial
     * bypass from queue allocation.
     */
    blk_queue_bypass_end(q);
    queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);

    ret = blk_trace_init_sysfs(dev);
    if (ret)
        return ret;

    ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
    if (ret < 0) {
        blk_trace_remove_sysfs(dev);
        return ret;
    }

    kobject_uevent(&q->kobj, KOBJ_ADD);

    if (q->mq_ops)
        blk_mq_register_disk(disk);

    if (!q->request_fn)
        return 0;

    ret = elv_register_queue(q);
    if (ret) {
        kobject_uevent(&q->kobj, KOBJ_REMOVE);
        kobject_del(&q->kobj);
        blk_trace_remove_sysfs(dev);
        kobject_put(&dev->kobj);
        return ret;
    }

    return 0;
}
コード例 #4
0
void blk_unregister_queue(struct gendisk *disk)
{
	struct request_queue *q = disk->queue;

	if (WARN_ON(!q))
		return;

	if (q->request_fn)
		elv_unregister_queue(q);

	kobject_uevent(&q->kobj, KOBJ_REMOVE);
	kobject_del(&q->kobj);
	blk_trace_remove_sysfs(disk_to_dev(disk));
	kobject_put(&disk_to_dev(disk)->kobj);
}
コード例 #5
0
void blk_unregister_queue(struct gendisk *disk)
{
	struct request_queue *q = disk->queue;

	if (WARN_ON(!q))
		return;

	queue_flag_clear_unlocked(QUEUE_FLAG_REGISTERED, q);

	wbt_exit(q);


	if (q->mq_ops)
		blk_mq_unregister_dev(disk_to_dev(disk), q);

	if (q->request_fn || (q->mq_ops && q->elevator))
		elv_unregister_queue(q);

	kobject_uevent(&q->kobj, KOBJ_REMOVE);
	kobject_del(&q->kobj);
	blk_trace_remove_sysfs(disk_to_dev(disk));
	kobject_put(&disk_to_dev(disk)->kobj);
}
コード例 #6
0
int blk_register_queue(struct gendisk *disk)
{
	int ret;
	struct device *dev = disk_to_dev(disk);
	struct request_queue *q = disk->queue;

	if (WARN_ON(!q))
		return -ENXIO;

	WARN_ONCE(test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags),
		  "%s is registering an already registered queue\n",
		  kobject_name(&dev->kobj));
	queue_flag_set_unlocked(QUEUE_FLAG_REGISTERED, q);

	/*
	 * SCSI probing may synchronously create and destroy a lot of
	 * request_queues for non-existent devices.  Shutting down a fully
	 * functional queue takes measureable wallclock time as RCU grace
	 * periods are involved.  To avoid excessive latency in these
	 * cases, a request_queue starts out in a degraded mode which is
	 * faster to shut down and is made fully functional here as
	 * request_queues for non-existent devices never get registered.
	 */
	if (!blk_queue_init_done(q)) {
		queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);
		percpu_ref_switch_to_percpu(&q->q_usage_counter);
		blk_queue_bypass_end(q);
	}

	ret = blk_trace_init_sysfs(dev);
	if (ret)
		return ret;

	/* Prevent changes through sysfs until registration is completed. */
	mutex_lock(&q->sysfs_lock);

	ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
	if (ret < 0) {
		blk_trace_remove_sysfs(dev);
		goto unlock;
	}

	if (q->mq_ops) {
		__blk_mq_register_dev(dev, q);
		blk_mq_debugfs_register(q);
	}

	kobject_uevent(&q->kobj, KOBJ_ADD);

	wbt_enable_default(q);

	blk_throtl_register_queue(q);

	if (q->request_fn || (q->mq_ops && q->elevator)) {
		ret = elv_register_queue(q);
		if (ret) {
			kobject_uevent(&q->kobj, KOBJ_REMOVE);
			kobject_del(&q->kobj);
			blk_trace_remove_sysfs(dev);
			kobject_put(&dev->kobj);
			goto unlock;
		}
	}
	ret = 0;
unlock:
	mutex_unlock(&q->sysfs_lock);
	return ret;
}