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Message-Id: <20250901033220.42982-7-yukuai1@huaweicloud.com>
Date: Mon,  1 Sep 2025 11:32:11 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: hch@...radead.org,
	colyli@...nel.org,
	hare@...e.de,
	dlemoal@...nel.org,
	tieren@...as.com,
	axboe@...nel.dk,
	tj@...nel.org,
	josef@...icpanda.com,
	song@...nel.org,
	kmo@...erainc.com,
	satyat@...gle.com,
	ebiggers@...gle.com,
	neil@...wn.name,
	akpm@...ux-foundation.org
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org,
	linux-raid@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: [PATCH RFC v3 06/15] md/raid0: convert raid0_handle_discard() to use bio_submit_split_bioset()

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

Unify bio split code, and prepare to fix disordered split IO

Noted commit 319ff40a5427 ("md/raid0: Fix performance regression for large
sequential writes") already fix disordered split IO by converting bio to
underlying disks before submit_bio_noacct(), with the respect
md_submit_bio() already split by sectors, and raid0_make_request() will
split at most once for unaligned IO. This is a bit hacky and we'll convert
this to solution in general later.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid0.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 1ba7d0c090f7..99f7839b4e96 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -463,23 +463,16 @@ static void raid0_handle_discard(struct mddev *mddev, struct bio *bio)
 	zone = find_zone(conf, &start);
 
 	if (bio_end_sector(bio) > zone->zone_end) {
-		struct bio *split = bio_split(bio,
-			zone->zone_end - bio->bi_iter.bi_sector, 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, zone->zone_end - bio->bi_iter.bi_sector,
+				&mddev->bio_set);
+		if (!bio)
 			return;
-		}
 
-		bio_chain(split, bio);
-		trace_block_split(split, bio->bi_iter.bi_sector);
-		submit_bio_noacct(bio);
-		bio = split;
 		end = zone->zone_end;
-	} else
+	} else {
 		end = bio_end_sector(bio);
+	}
 
 	orig_end = end;
 	if (zone != conf->strip_zone)
-- 
2.39.2


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