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Commit 0fc09f92 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

blk-mq: export setting request completion state 



This is preparing for drivers that want to directly alter the state of
their requests. No functional change here.

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 8f3ea359

block/blk-mq.c

+1 −3
Original line number Diff line number Diff line
@@ -558,10 +558,8 @@ static void __blk_mq_complete_request(struct request *rq) 
	bool shared = false;

	int cpu;



	if (cmpxchg(&rq->state, MQ_RQ_IN_FLIGHT, MQ_RQ_COMPLETE) !=

			MQ_RQ_IN_FLIGHT)

	if (!blk_mq_mark_complete(rq))

		return;



	if (rq->internal_tag != -1)

		blk_mq_sched_completed_request(rq);

include/linux/blk-mq.h

+14 −0
Original line number Diff line number Diff line
@@ -287,6 +287,20 @@ void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); 


void blk_mq_quiesce_queue_nowait(struct request_queue *q);



/**

 * blk_mq_mark_complete() - Set request state to complete

 * @rq: request to set to complete state

 *

 * Returns true if request state was successfully set to complete. If

 * successful, the caller is responsibile for seeing this request is ended, as

 * blk_mq_complete_request will not work again.

 */

static inline bool blk_mq_mark_complete(struct request *rq)

{

	return cmpxchg(&rq->state, MQ_RQ_IN_FLIGHT, MQ_RQ_COMPLETE) ==

			MQ_RQ_IN_FLIGHT;

}



/*

 * Driver command data is immediately after the request. So subtract request

 * size to get back to the original request, add request size to get the PDU.