1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index d053098c6a91..699b5be68d31 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -458,7 +458,7 @@ static void map_region(struct dm_io_region *io, struct mirror *m,
 {
         io->bdev = m->dev->bdev;
         io->sector = map_sector(m, bio);
-        io->count = bio->bi_size >> 9;
+        io->count = bio_sectors(bio);
 }
 
 static void hold_bio(struct mirror_set *ms, struct bio *bio)