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From: Pavel Begunkov <asml.silence@gmail.com>
To: linux-block@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, Pavel Begunkov <asml.silence@gmail.com>
Subject: [PATCH 2/3] block: clean up blk_mq_submit_bio() merging
Date: Wed, 20 Oct 2021 20:00:49 +0100	[thread overview]
Message-ID: <daedc90d4029a5d1d73344771632b1faca3aaf81.1634755800.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1634755800.git.asml.silence@gmail.com>

Combine blk_mq_sched_bio_merge() and blk_attempt_plug_merge() under a
common if, so we don't check it twice.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 block/blk-mq-sched.c |  2 +-
 block/blk-mq-sched.h | 12 +-----------
 block/blk-mq.c       | 15 +++++++--------
 3 files changed, 9 insertions(+), 20 deletions(-)

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index e85b7556b096..5b259fdea794 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -361,7 +361,7 @@ void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx)
 	}
 }
 
-bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
+bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
 		unsigned int nr_segs)
 {
 	struct elevator_queue *e = q->elevator;
diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
index 98836106b25f..25d1034952b6 100644
--- a/block/blk-mq-sched.h
+++ b/block/blk-mq-sched.h
@@ -12,7 +12,7 @@ void blk_mq_sched_assign_ioc(struct request *rq);
 
 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
 		unsigned int nr_segs, struct request **merged_request);
-bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
+bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
 		unsigned int nr_segs);
 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
 				   struct list_head *free);
@@ -42,16 +42,6 @@ static inline bool bio_mergeable(struct bio *bio)
 	return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
 }
 
-static inline bool
-blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
-		unsigned int nr_segs)
-{
-	if (blk_queue_nomerges(q) || !bio_mergeable(bio))
-		return false;
-
-	return __blk_mq_sched_bio_merge(q, bio, nr_segs);
-}
-
 static inline bool
 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
 			 struct bio *bio)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index a71aeed7b987..f159d007a015 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2481,7 +2481,6 @@ void blk_mq_submit_bio(struct bio *bio)
 {
 	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
 	const int is_sync = op_is_sync(bio->bi_opf);
-	const int is_flush_fua = op_is_flush(bio->bi_opf);
 	struct request *rq;
 	struct blk_plug *plug;
 	bool same_queue_rq = false;
@@ -2495,12 +2494,12 @@ void blk_mq_submit_bio(struct bio *bio)
 	if (!bio_integrity_prep(bio))
 		goto queue_exit;
 
-	if (!is_flush_fua && !blk_queue_nomerges(q) &&
-	    blk_attempt_plug_merge(q, bio, nr_segs, &same_queue_rq))
-		goto queue_exit;
-
-	if (blk_mq_sched_bio_merge(q, bio, nr_segs))
-		goto queue_exit;
+	if (!blk_queue_nomerges(q) && bio_mergeable(bio)) {
+		if (blk_attempt_plug_merge(q, bio, nr_segs, &same_queue_rq))
+			goto queue_exit;
+		if (blk_mq_sched_bio_merge(q, bio, nr_segs))
+			goto queue_exit;
+	}
 
 	rq_qos_throttle(q, bio);
 
@@ -2543,7 +2542,7 @@ void blk_mq_submit_bio(struct bio *bio)
 		return;
 	}
 
-	if (is_flush_fua && blk_insert_flush(rq))
+	if (op_is_flush(bio->bi_opf) && blk_insert_flush(rq))
 		return;
 
 	if (plug && (q->nr_hw_queues == 1 ||
-- 
2.33.1


  parent reply	other threads:[~2021-10-20 19:01 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-20 19:00 [PATCH 0/3] random simple block cleanups Pavel Begunkov
2021-10-20 19:00 ` [PATCH 1/3] block: optimise boundary blkdev_read_iter's checks Pavel Begunkov
2021-10-20 19:00 ` Pavel Begunkov [this message]
2021-10-20 19:04   ` [PATCH 2/3] block: clean up blk_mq_submit_bio() merging Pavel Begunkov
2021-10-21  8:30   ` Christoph Hellwig
2021-10-21 13:32     ` Pavel Begunkov
2021-10-20 19:00 ` [PATCH 3/3] block: convert fops.c magic constants to SHIFT_SECTOR Pavel Begunkov
2021-10-21  8:31   ` Christoph Hellwig
2021-10-21 14:27 ` [PATCH 0/3] random simple block cleanups Jens Axboe

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