block dangerous passthrough operation

[Christoph Hellwig]

On Wed, Nov 16, 2022 at 08:49:42PM -0700, Jens Axboe wrote:
> Honestly, I think this is a mess, and it's exactly why I didn't like
> going down this path to begin with. I'm assuming that last 'now' above
> should be a 'not'? This approach is not going to be maintainable.

What else can be we?  Allow people to put the driver into all kinds of
weird states without us even knowing and just deal with it?

And yes, it is a mess but so is the complete lack of layering in
NVMe (and a lot else..).