Use the shared mddev_bio_split_at_reshape_offset() helper so RAID10
submits only one-side bios to llbitmap during reshape.

Signed-off-by: Yu Kuai <yukuai@fnnas.com>
---
 drivers/md/raid10.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 13e31d01ed0f..b54cb1828a48 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1891,6 +1891,12 @@ static bool raid10_make_request(struct mddev *mddev, struct bio *bio)
 		sectors = chunk_sects -
 			(bio->bi_iter.bi_sector &
 			 (chunk_sects - 1));
+
+	bio = mddev_bio_split_at_reshape_offset(mddev, bio, &sectors,
+						&conf->bio_split);
+	if (!bio)
+		return true;
+
 	__make_request(mddev, bio, sectors);
 
 	/* In case raid10d snuck in to freeze_array */
@@ -4264,7 +4270,6 @@ static int raid10_check_reshape(struct mddev *mddev)
 	    mddev->new_chunk_sectors &&
 	    mddev->new_chunk_sectors < mddev->chunk_sectors)
 		return -EOPNOTSUPP;
-
 	if (setup_geo(&geo, mddev, geo_start) != conf->copies)
 		/* mustn't change number of copies */
 		return -EINVAL;
-- 
2.51.0