clone_bio
struct bio *clone_bio;
clone_bio = bio_alloc_clone(dc->bdev, orig_bio, GFP_NOIO,
ddip = container_of(clone_bio, struct detached_dev_io_private, bio);
clone_bio->bi_end_io = detached_dev_end_io;
clone_bio->bi_private = dc;
submit_bio_noacct(clone_bio);
struct bio *clone = clone_bio(ti, fc, bio);