[RFC 3/3] nvme: create special request queue for cdev

[Christoph Hellwig]

On Mon, May 01, 2023 at 08:33:06AM -0700, Keith Busch wrote:
> From: Keith Busch <kbusch at kernel.org>
> 
> The cdev only services passthrough commands which don't merge, track
> stats, or need accounting. Give it a special request queue with all
> these options cleared so that we're not adding overhead for it.

Why can't we always skip these for passthrough commands on any queue
with a little bit of core code?