linux-kernel - [PATCH RFC v3 09/15] md/raid10: convert read/write to use bio_submit_split

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Message-Id: <20250901033220.42982-10-yukuai1@huaweicloud.com>
Date: Mon,  1 Sep 2025 11:32:14 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: hch@...radead.org,
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	hare@...e.de,
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Cc: linux-block@...r.kernel.org,
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Subject: [PATCH RFC v3 09/15] md/raid10: convert read/write to use bio_submit_split_bioset()

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

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

Noted discard is not handled, because discard is only split for
unaligned head and tail, and this can be considered slow path, the
disorder here does not matter much.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid10.c | 42 +++++++++++++-----------------------------
 1 file changed, 13 insertions(+), 29 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index a775a1317635..69477be91b26 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1156,7 +1156,6 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
 	int slot = r10_bio->read_slot;
 	struct md_rdev *err_rdev = NULL;
 	gfp_t gfp = GFP_NOIO;
-	int error;
 
 	if (slot >= 0 && r10_bio->devs[slot].rdev) {
 		/*
@@ -1205,19 +1204,15 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
 				   rdev->bdev,
 				   (unsigned long long)r10_bio->sector);
 	if (max_sectors < bio_sectors(bio)) {
-		struct bio *split = bio_split(bio, max_sectors,
-					      gfp, &conf->bio_split);
-		if (IS_ERR(split)) {
-			error = PTR_ERR(split);
+		allow_barrier(conf);
+		bio = bio_submit_split_bioset(bio, max_sectors,
+					      &conf->bio_split);
+		wait_barrier(conf, false);
+		if (!bio) {
+			set_bit(R10BIO_Returned, &r10_bio->state);
 			goto err_handle;
 		}
 
-		bio_chain(split, bio);
-		trace_block_split(split, bio->bi_iter.bi_sector);
-		allow_barrier(conf);
-		submit_bio_noacct(bio);
-		wait_barrier(conf, false);
-		bio = split;
 		r10_bio->master_bio = bio;
 		r10_bio->sectors = max_sectors;
 	}
@@ -1245,8 +1240,6 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
 	return;
 err_handle:
 	atomic_dec(&rdev->nr_pending);
-	bio->bi_status = errno_to_blk_status(error);
-	set_bit(R10BIO_Uptodate, &r10_bio->state);
 	raid_end_bio_io(r10_bio);
 }
 
@@ -1355,7 +1348,6 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
 	int i, k;
 	sector_t sectors;
 	int max_sectors;
-	int error;
 
 	if ((mddev_is_clustered(mddev) &&
 	     mddev->cluster_ops->area_resyncing(mddev, WRITE,
@@ -1469,10 +1461,8 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
 				 * complexity of supporting that is not worth
 				 * the benefit.
 				 */
-				if (bio->bi_opf & REQ_ATOMIC) {
-					error = -EIO;
+				if (bio->bi_opf & REQ_ATOMIC)
 					goto err_handle;
-				}
 
 				good_sectors = first_bad - dev_sector;
 				if (good_sectors < max_sectors)
@@ -1493,19 +1483,15 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
 		r10_bio->sectors = max_sectors;
 
 	if (r10_bio->sectors < bio_sectors(bio)) {
-		struct bio *split = bio_split(bio, r10_bio->sectors,
-					      GFP_NOIO, &conf->bio_split);
-		if (IS_ERR(split)) {
-			error = PTR_ERR(split);
+		allow_barrier(conf);
+		bio = bio_submit_split_bioset(bio, r10_bio->sectors,
+					      &conf->bio_split);
+		wait_barrier(conf, false);
+		if (!bio) {
+			set_bit(R10BIO_Returned, &r10_bio->state);
 			goto err_handle;
 		}
 
-		bio_chain(split, bio);
-		trace_block_split(split, bio->bi_iter.bi_sector);
-		allow_barrier(conf);
-		submit_bio_noacct(bio);
-		wait_barrier(conf, false);
-		bio = split;
 		r10_bio->master_bio = bio;
 	}
 
@@ -1537,8 +1523,6 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
 		}
 	}
 
-	bio->bi_status = errno_to_blk_status(error);
-	set_bit(R10BIO_Uptodate, &r10_bio->state);
 	raid_end_bio_io(r10_bio);
 }
 
-- 
2.39.2