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Commit 9ba20527 authored by Jens Axboe's avatar Jens Axboe
Browse files

blk-mq: provide mq_ops->busy() hook 



We'll hook into this from blk_lld_busy(), allowing blk-mq to also
return whether or not a given queue currently has requests in
progress.

Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Tested-by: default avatarMing Lei <ming.lei@redhat.com>
Reviewed-by: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent ba7b4434

block/blk-core.c

+2 −0
Original line number Diff line number Diff line
@@ -3431,6 +3431,8 @@ int blk_lld_busy(struct request_queue *q) 
{

	if (q->lld_busy_fn)

		return q->lld_busy_fn(q);

	if (q->mq_ops && q->mq_ops->busy)

		return q->mq_ops->busy(q);



	return 0;

}

include/linux/blk-mq.h

+6 −0
Original line number Diff line number Diff line
@@ -114,6 +114,7 @@ typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *, 
typedef void (busy_tag_iter_fn)(struct request *, void *, bool);

typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);

typedef int (map_queues_fn)(struct blk_mq_tag_set *set);

typedef bool (busy_fn)(struct request_queue *);





struct blk_mq_ops {
@@ -165,6 +166,11 @@ struct blk_mq_ops { 
	/* Called from inside blk_get_request() */

	void (*initialize_rq_fn)(struct request *rq);



	/*

	 * If set, returns whether or not this queue currently is busy

	 */

	busy_fn			*busy;



	map_queues_fn		*map_queues;



#ifdef CONFIG_BLK_DEBUG_FS