static size_t reencrypt_buffer_length(struct luks2_reencrypt *rh)
{
	if (rh->data_shift)
		return rh->data_shift;
	return rh->length;
}
static size_t reencrypt_buffer_length(struct luks2_reencrypt *rh)
{
	if (rh->data_shift)
		return rh->data_shift;
	return rh->length;
}