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blk-mq: rework I/O completions

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Rework I/O completions to work more like the old code path.  blk_mq_end_io
now stays out of the business of deferring completions to others CPUs
and calling blk_mark_rq_complete.  The latter is very important to allow
completing requests that have timed out and thus are already marked completed,
the former allows using the IPI callout even for driver specific completions
instead of having to reimplement them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2014-02-10 03:24:38 -08:00
committed by Jens Axboe
parent c4540a7d8c
commit 30a91cb4ef
4 changed files with 37 additions and 24 deletions
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4
include/linux/blk-mq.h
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@@ -86,6 +86,8 @@ struct blk_mq_ops {
*/
rq_timed_out_fn *timeout;
softirq_done_fn *complete;
/*
* Override for hctx allocations (should probably go)
*/
@@ -137,6 +139,8 @@ void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int);
void blk_mq_end_io(struct request *rq, int error);
void blk_mq_complete_request(struct request *rq);
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_stop_hw_queues(struct request_queue *q);