linux-kernel - [PATCH RFC v2 10/10] md/raid0: convert raid0_make_request() to use bio_submit_split

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Message-Id: <20250828065733.556341-11-yukuai1@huaweicloud.com>
Date: Thu, 28 Aug 2025 14:57:33 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: axboe@...nel.dk,
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Subject: [PATCH RFC v2 10/10] md/raid0: convert raid0_make_request() to use bio_submit_split_bioset()

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

Currently, raid0_make_request() will remap the original bio to underlying
disks to prevent disordered IO. Now that bio_submit_split_bioset() will put
original bio to the head of current->bio_list, it's safe converting to use
this helper and bio will still be ordered.

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

CC: Jan Kara <jack@...e.cz>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid0.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 4dcc5133d679..8773f633299e 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -607,17 +607,9 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
 		 : sector_div(sector, chunk_sects));
 
 	if (sectors < bio_sectors(bio)) {
-		struct bio *split = bio_split(bio, sectors, GFP_NOIO,
-					      &mddev->bio_set);
-
-		if (IS_ERR(split)) {
-			bio->bi_status = errno_to_blk_status(PTR_ERR(split));
-			bio_endio(bio);
+		bio = bio_submit_split_bioset(bio, sectors, &mddev->bio_set);
+		if (!bio)
 			return true;
-		}
-		bio_chain(split, bio);
-		raid0_map_submit_bio(mddev, bio);
-		bio = split;
 	}
 
 	raid0_map_submit_bio(mddev, bio);
-- 
2.39.2