queue_atomic_write_unit_min_bytes
queue_atomic_write_unit_min_bytes(bd_queue),
if (bio->bi_iter.bi_size % queue_atomic_write_unit_min_bytes(q))
queue_atomic_write_unit_min_bytes(q) / block_size;
return queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev));