linux-kernel - [PATCH RFC 5/7] md/raid5: convert to use bio_submit

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Message-Id: <20250825093700.3731633-6-yukuai1@huaweicloud.com>
Date: Mon, 25 Aug 2025 17:36:58 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: hch@...radead.org,
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Cc: linux-block@...r.kernel.org,
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Subject: [PATCH RFC 5/7] md/raid5: convert to use bio_submit_split()

From: Yu Kuai <yukuai3@...wei.com>

On the one hand unify bio split code, prepare to fix disordered split
IO; On the other hand fix missing blkcg_bio_issue_init() and
trace_block_split() for split IO.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid5.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 023649fe2476..9ae749e66e9d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5468,17 +5468,19 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
 
 static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio)
 {
-	struct bio *split;
 	sector_t sector = raid_bio->bi_iter.bi_sector;
 	unsigned chunk_sects = mddev->chunk_sectors;
 	unsigned sectors = chunk_sects - (sector & (chunk_sects-1));
 
 	if (sectors < bio_sectors(raid_bio)) {
 		struct r5conf *conf = mddev->private;
-		split = bio_split(raid_bio, sectors, GFP_NOIO, &conf->bio_split);
-		bio_chain(split, raid_bio);
-		submit_bio_noacct(raid_bio);
-		raid_bio = split;
+
+		raid_bio = bio_submit_split(raid_bio, sectors,
+					    &conf->bio_split);
+		if (!raid_bio)
+			return NULL;
+
+		raid_bio->bi_opf &= ~REQ_NOMERGE;
 	}
 
 	if (!raid5_read_one_chunk(mddev, raid_bio))
-- 
2.39.2