[PATCH] md/raid10: split reshape bios before bitmap accounting

[Yu Kuai <yukuai@kernel.org>]

From: Yu Kuai <yukuai@fygo.io>

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@fygo.io>
---
 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 40000b867136..cd35d183877c 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1898,10 +1898,16 @@ static bool raid10_make_request(struct mddev *mddev, struct bio *bio)
 			 || conf->prev.near_copies <
 			 conf->prev.raid_disks)))
 		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 */
 	wake_up_barrier(conf);
 	return true;
@@ -4273,11 +4279,10 @@ static int raid10_check_reshape(struct mddev *mddev)
 		return -EINVAL;
 	if (mddev->bitmap_id == ID_LLBITMAP &&
 	    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;
 	if (geo.far_copies > 1 && !geo.far_offset)
 		/* Cannot switch to 'far' mode */
-- 
2.51.0