[PATCH] md/raid5: split reshape bios before bitmap accounting

[Yu Kuai]

From: Yu Kuai <yukuai@xxxxxxx>

Use the shared mddev_bio_split_at_reshape_offset() helper so RAID5
submits only one-side bios to llbitmap during reshape.

Signed-off-by: Yu Kuai <yukuai@xxxxxxx>
---
 drivers/md/raid5.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 6786f30dc59b..dde10b5b0ff5 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6172,10 +6172,18 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
 		make_discard_request(mddev, bi);
 		md_write_end(mddev);
 		return true;
 	}
 
+	bi = mddev_bio_split_at_reshape_offset(mddev, bi, NULL,
+					       &conf->bio_split);
+	if (!bi) {
+		if (rw == WRITE)
+			md_write_end(mddev);
+		return true;
+	}
+
 	logical_sector = bi->bi_iter.bi_sector & ~((sector_t)RAID5_STRIPE_SECTORS(conf)-1);
 	bi->bi_next = NULL;
 
 	ctx = mempool_alloc(conf->ctx_pool, GFP_NOIO);
 	memset(ctx, 0, conf->ctx_size);
-- 
2.51.0