[PATCH RFC 6/7] md/md-linear: convert to use bio_submit_split()

[Yu Kuai <yukuai1@huaweicloud.com>]

From: Yu Kuai <yukuai3@huawei.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@huawei.com>
---
 drivers/md/md-linear.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c
index 5d9b08115375..61375c61e4aa 100644
--- a/drivers/md/md-linear.c
+++ b/drivers/md/md-linear.c
@@ -256,18 +256,10 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio)
 
 	if (unlikely(bio_end_sector(bio) > end_sector)) {
 		/* This bio crosses a device boundary, so we have to split it */
-		struct bio *split = bio_split(bio, end_sector - bio_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(bio, end_sector - bio_sector,
+				       &mddev->bio_set);
+		if (!bio)
 			return true;
-		}
-
-		bio_chain(split, bio);
-		submit_bio_noacct(bio);
-		bio = split;
 	}
 
 	md_account_bio(mddev, &bio);
-- 
2.39.2