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block: add completion handler for fast path 

The batched completions only deal with non-partial requests anyway,
and it doesn't deal with any requests that have errors. Add a completion
handler that assumes it's a full request and that it's all being ended
successfully.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-12-01 15:01:51 -07:00
parent 68497092bd
commit 5581a5ddfe
1 changed files with 42 additions and 1 deletions
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43
block/blk-mq.c
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@ -709,6 +709,47 @@ static void blk_print_req_error(struct request *req, blk_status_t status)
IOPRIO_PRIO_CLASS(req->ioprio));
}
/*
* Fully end IO on a request. Does not support partial completions, or
* errors.
*/
static void blk_complete_request(struct request *req)
{
const bool is_flush = (req->rq_flags & RQF_FLUSH_SEQ) != 0;
int total_bytes = blk_rq_bytes(req);
struct bio *bio = req->bio;
trace_block_rq_complete(req, BLK_STS_OK, total_bytes);
if (!bio)
return;
#ifdef CONFIG_BLK_DEV_INTEGRITY
if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ)
req->q->integrity.profile->complete_fn(req, total_bytes);
#endif
blk_account_io_completion(req, total_bytes);
do {
struct bio *next = bio->bi_next;
/* Completion has already been traced */
bio_clear_flag(bio, BIO_TRACE_COMPLETION);
if (!is_flush)
bio_endio(bio);
bio = next;
} while (bio);
/*
* Reset counters so that the request stacking driver
* can find how many bytes remain in the request
* later.
*/
req->bio = NULL;
req->__data_len = 0;
}
/**
* blk_update_request - Complete multiple bytes without completing the request
* @req: the request being processed
@ -922,7 +963,7 @@ void blk_mq_end_request_batch(struct io_comp_batch *iob)
prefetch(rq->bio);
prefetch(rq->rq_next);
blk_update_request(rq, BLK_STS_OK, blk_rq_bytes(rq));
blk_complete_request(rq);
if (iob->need_ts)
__blk_mq_end_request_acct(rq, now);