block dangerous passthrough operation

[Christoph Hellwig]

On Wed, Nov 16, 2022 at 06:55:02PM +0530, Kanchan Joshi wrote:
> Sorry to hear about the trouble, but I am confused how did this
> happen.
> The old code also did not allow fabrics command and any other
> admin command except id-ns variants. Yet this series had to
> explicitly disallow admin cmds such create/delete sq/cq and
> set-features.

This is not a regression in your code, sorry if I made that
impression.  This is a long-standing issue since these ioctls
were originally added.