[PATCH v5 25/29] md/raid10: split reshape bios before bitmap accounting

From: Yu Kuai <[email protected]>

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

Tested-by: Mykola Marzhan <[email protected]>
Signed-off-by: Yu Kuai <[email protected]>
---
 drivers/md/raid10.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index bac9edd28c97..562a325a7195 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1848,6 +1848,7 @@ static bool raid10_make_request(struct mddev *mddev, struct bio *bio)
 {
 	struct r10conf *conf = mddev->private;
 	sector_t chunk_mask = (conf->geo.chunk_mask & conf->prev.chunk_mask);
+	const int rw = bio_data_dir(bio);
 	int chunk_sects = chunk_mask + 1;
 	int sectors = bio_sectors(bio);
 
@@ -1873,6 +1874,15 @@ 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) {
+		if (rw == WRITE)
+			md_write_end(mddev);
+		return true;
+	}
+
 	if (!__make_request(mddev, bio, sectors))
 		md_write_end(mddev);
 
-- 
2.51.0