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blk-mq: export setting request completion state

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

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2018-07-23 08:37:50 -06:00 committed by Jens Axboe
parent 8f3ea35929
commit 0fc09f9209
2 changed files with 15 additions and 3 deletions
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4
block/blk-mq.c
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@ -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);

14
include/linux/blk-mq.h
View File

@ -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.