[PATCH v4 4/5] nvme: wire-up uring-cmd support for io-passthru on char-device.

[Christoph Hellwig]

Sorry a few ints while looking overthis again:

> +static void nvme_end_async_pt(struct request *req, blk_status_t err)

The naming here is a bit silly and doesn't match what we use elsewhere
in the code.  I'd suggest nvme_uring_cmd_end_io instead.
> +{
> +	struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
> +
> +	/* to free bio on completion, as req->bio will be null at that time */
> +	pdu->bio = rq->bio;
> +	pdu->meta = nvme_meta_from_bio(rq->bio);
> +	pdu->meta_buffer = meta_buffer;
> +	pdu->meta_len = meta_len;
> +	rq->end_io_data = ioucmd;
> +}

And this really should be folded into the only caller.