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blk-mq: blk-mq: provide forced completion method 

Drivers may need to bypass error injection for error recovery. Rename
__blk_mq_complete_request() to blk_mq_force_complete_rq() and export
that function so drivers may skip potential fake timeouts after they've
reclaimed lost requests.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2020-05-29 07:51:59 -07:00 committed by Jens Axboe
parent dc35ada425
commit 7b11eab041
2 changed files with 14 additions and 2 deletions
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15
block/blk-mq.c
View File

@ -556,7 +556,17 @@ static void __blk_mq_complete_request_remote(void *data)
q->mq_ops->complete(rq);
}
static void __blk_mq_complete_request(struct request *rq)
/**
* blk_mq_force_complete_rq() - Force complete the request, bypassing any error
* injection that could drop the completion.
* @rq: Request to be force completed
*
* Drivers should use blk_mq_complete_request() to complete requests in their
* normal IO path. For timeout error recovery, drivers may call this forced
* completion routine after they've reclaimed timed out requests to bypass
* potentially subsequent fake timeouts.
*/
void blk_mq_force_complete_rq(struct request *rq)
{
struct blk_mq_ctx *ctx = rq->mq_ctx;
struct request_queue *q = rq->q;
@ -602,6 +612,7 @@ static void __blk_mq_complete_request(struct request *rq)
}
put_cpu();
}
EXPORT_SYMBOL_GPL(blk_mq_force_complete_rq);
static void hctx_unlock(struct blk_mq_hw_ctx *hctx, int srcu_idx)
__releases(hctx->srcu)
@ -635,7 +646,7 @@ bool blk_mq_complete_request(struct request *rq)
{
if (unlikely(blk_should_fake_timeout(rq->q)))
return false;
__blk_mq_complete_request(rq);
blk_mq_force_complete_rq(rq);
return true;
}
EXPORT_SYMBOL(blk_mq_complete_request);

1
include/linux/blk-mq.h
View File

@ -494,6 +494,7 @@ void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
void blk_mq_kick_requeue_list(struct request_queue *q);
void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
bool blk_mq_complete_request(struct request *rq);
void blk_mq_force_complete_rq(struct request *rq);
bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
struct bio *bio, unsigned int nr_segs);
bool blk_mq_queue_stopped(struct request_queue *q);