[PATCH v3 4/5] nvme: wire-up uring-cmd support for io-passthru on char-device.

[Christoph Hellwig]

On Tue, May 03, 2022 at 08:48:30PM +0200, Pankaj Raghav wrote:
> operation NVME_URING_CMD_IO. This operates on a new structure
> nvme_uring_cmd, which is similiar to struct nvme_passthru_cmd64 but
> without the embedded 8b result field. This is not needed since uring-cmd
> allows to return additional result to user-space via big-CQE.

So let's have a discussion for everyone on whether to reuse the existing
struct or not.

Pros for reusing:

 - any application that is passing around a nvme_passthru_cmd64 doesn't
   need to do special marshalling

Cons:

 - these fields are pointless

I'm fine going either way, we just need to think about the implications.

Otherwise this looks good:

Reviewed-by: Christoph Hellwig <hch at lst.de>