[RFC 3/3] nvme : Add ioctl to query nvme attributes

[Keith Busch]

On Fri, Oct 28, 2022 at 12:38:27PM +0200, Joel Granados wrote:
> 3. And the variables that are not in struct nvme_ctrl. Here, we have not
>    option but to make an IO.

You do have another option: we have historically added new fields to
nvme_ctrl to cache parameters that are repeatedly referenced in other
contexts, and this usage appears to qualify.