diff options
| author | Xiao Ni <xni@redhat.com> | 2023-02-09 11:19:30 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-02-09 08:11:25 -0700 |
| commit | 23f3e3272e7a4d9fb870485cd6df1e4f9539282c (patch) | |
| tree | 4db43c1367b06fd524083a2a7539d0397ed44fac /block | |
| parent | dcb52201435197c56154ff7c8cb139284d254bda (diff) | |
block: Merge bio before checking ->cached_rq
It checks if plug->cached_rq is empty before merging bio. But the merge action
doesn't have relationship with plug->cached_rq, it trys to merge bio with
requests within plug->mq_list. Now it checks if ->cached_rq is empty before
merging bio. If it's empty, it will miss the merge chances. So move the merge
function before checking ->cached_rq.
Signed-off-by: Xiao Ni <xni@redhat.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230209031930.27354-1-xni@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 89b4dd81ae17..08093d4348dd 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2879,15 +2879,16 @@ static inline struct request *blk_mq_get_cached_request(struct request_queue *q, if (!plug) return NULL; - rq = rq_list_peek(&plug->cached_rq); - if (!rq || rq->q != q) - return NULL; if (blk_mq_attempt_bio_merge(q, *bio, nsegs)) { *bio = NULL; return NULL; } + rq = rq_list_peek(&plug->cached_rq); + if (!rq || rq->q != q) + return NULL; + type = blk_mq_get_hctx_type((*bio)->bi_opf); hctx_type = rq->mq_hctx->type; if (type != hctx_type && |