If we don't end up doing the checks in the block layer:
> + /*
> + * Ensure that nothing has been sent which cannot be executed
> + * atomically.
> + */
> + if (req->cmd_flags & REQ_ATOMIC) {
> + struct nvme_ns_head *head = ns->head;
> + u32 boundary_bytes = head->atomic_boundary;
... please split the checks into a helper. And merge them into the
previous patch.
