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block: add support for blk_mq_end_request_batch()

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Instead of calling blk_mq_end_request() on a single request, add a helper
that takes the new struct io_comp_batch and completes any request stored
in there.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2021-10-08 05:50:46 -06:00
parent 1aec5e4a29
commit f794f3351f
4 changed files with 100 additions and 20 deletions
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29
include/linux/blk-mq.h
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@@ -728,6 +728,35 @@ static inline void blk_mq_set_request_complete(struct request *rq)
void blk_mq_start_request(struct request *rq);
void blk_mq_end_request(struct request *rq, blk_status_t error);
void __blk_mq_end_request(struct request *rq, blk_status_t error);
void blk_mq_end_request_batch(struct io_comp_batch *ib);
/*
* Only need start/end time stamping if we have iostat or
* blk stats enabled, or using an IO scheduler.
*/
static inline bool blk_mq_need_time_stamp(struct request *rq)
{
return (rq->rq_flags & (RQF_IO_STAT | RQF_STATS | RQF_ELV));
}
/*
* Batched completions only work when there is no I/O error and no special
* ->end_io handler.
*/
static inline bool blk_mq_add_to_batch(struct request *req,
struct io_comp_batch *iob, int ioerror,
void (*complete)(struct io_comp_batch *))
{
if (!iob || (req->rq_flags & RQF_ELV) || req->end_io || ioerror)
return false;
if (!iob->complete)
iob->complete = complete;
else if (iob->complete != complete)
return false;
iob->need_ts |= blk_mq_need_time_stamp(req);
rq_list_add(&iob->req_list, req);
return true;
}
void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
void blk_mq_kick_requeue_list(struct request_queue *q);