block dangerous passthrough operation

[Kanchan Joshi]

On Wed, Nov 16, 2022 at 02:38:39PM +0100, Christoph Hellwig wrote:
>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.

I see, good to know. I am still missing something.
This series is on top of nvme-6.2, since nvme_cmd_allowed did not exist
earlier.
In that case having this series or not having - gives the same effect,
no?