nvme ioctl refactor and generic per-namespace char device

[Keith Busch]

On Thu, Apr 08, 2021 at 02:08:29PM +0200, Christoph Hellwig wrote:
> Hi all,
> 
> this series picks up the generic per-namespace character device
> from Minwoo and Javier with a few small fixed, but rebases them on
> an ioctl refactoring I had pending, which cleans up a lot of the
> lower level code.

Patches 1-12 look good.

Reviewed-by: Keith Busch <kbusch at kernel.org>