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Commit 29ece8b4 authored by Yufen Yu's avatar Yufen Yu Committed by Jens Axboe
Browse files

block: add BLK_MQ_POLL_CLASSIC for hybrid poll and return EINVAL for unexpected value 



For q->poll_nsec == -1, means doing classic poll, not hybrid poll.
We introduce a new flag BLK_MQ_POLL_CLASSIC to replace -1, which
may make code much easier to read.

Additionally, since val is an int obtained with kstrtoint(), val can be
a negative value other than -1, so return -EINVAL for that case.

Thanks to Damien Le Moal for some good suggestion.

Reviewed-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarYufen Yu <yuyufen@huawei.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 9496c015

block/blk-mq.c

+2 −2
Original line number Diff line number Diff line
@@ -2856,7 +2856,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, 
	/*

	 * Default to classic polling

	 */

	q->poll_nsec = -1;

	q->poll_nsec = BLK_MQ_POLL_CLASSIC;



	blk_mq_init_cpu_queues(q, set->nr_hw_queues);

	blk_mq_add_queue_tag_set(set, q);
@@ -3391,7 +3391,7 @@ static bool blk_mq_poll_hybrid(struct request_queue *q, 
{

	struct request *rq;



	if (q->poll_nsec == -1)

	if (q->poll_nsec == BLK_MQ_POLL_CLASSIC)

		return false;



	if (!blk_qc_t_is_internal(cookie))

block/blk-sysfs.c

+7 −5
Original line number Diff line number Diff line
@@ -360,8 +360,8 @@ static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) 
{

	int val;



	if (q->poll_nsec == -1)

		val = -1;

	if (q->poll_nsec == BLK_MQ_POLL_CLASSIC)

		val = BLK_MQ_POLL_CLASSIC;

	else

		val = q->poll_nsec / 1000;
@@ -380,10 +380,12 @@ static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, 
	if (err < 0)

		return err;



	if (val == -1)

		q->poll_nsec = -1;

	else

	if (val == BLK_MQ_POLL_CLASSIC)

		q->poll_nsec = BLK_MQ_POLL_CLASSIC;

	else if (val >= 0)

		q->poll_nsec = val * 1000;

	else

		return -EINVAL;



	return count;

}

include/linux/blkdev.h

+3 −0
Original line number Diff line number Diff line
@@ -50,6 +50,9 @@ struct blk_stat_callback; 
/* Must be consistent with blk_mq_poll_stats_bkt() */

#define BLK_MQ_POLL_STATS_BKTS 16



/* Doing classic polling */

#define BLK_MQ_POLL_CLASSIC -1



/*

 * Maximum number of blkcg policies allowed to be registered concurrently.

 * Defined here to simplify include dependency.