bio_crypt_dun_is_contiguous
return !bc1 || bio_crypt_dun_is_contiguous(bc1, bc1_bytes, bc2->bc_dun);
return bio_crypt_dun_is_contiguous(bc, bio->bi_iter.bi_size, next_dun);
bool bio_crypt_dun_is_contiguous(const struct bio_crypt_ctx *bc,