[PATCH 4/6] block: introduce IOCTL to report dev properties

[Javier González]

> On 26 Jun 2020, at 17.52, Keith Busch <kbusch at kernel.org> wrote:
> 
> On Fri, Jun 26, 2020 at 08:28:28AM +0200, Javier González wrote:
>>> On 26.06.2020 05:25, Keith Busch wrote:
>>> On Thu, Jun 25, 2020 at 09:42:48PM +0200, Javier González wrote:
>>>> We can use nvme passthru, but this bypasses the zoned block abstraction.
>>>> Why not representing ZNS features in the standard zoned block API?
>>> 
>>> This looks too nvme zns specific to want the block layer in the middle.
>>> Just use the driver's passthrough interface.
>> 
>> Ok. Is it OK with you to expose them in sysfs as Damien suggested?
> 
> sysfs sounds fine to me for some attributes (ex: mar/mor), but I don't
> think every zns property warrants exposing through this interface. I
> just don't want to corner driver maintenance into chasing every spec
> field. If applications really want every last detail, they can get it
> directly from the device without any kernel dependencies.

Ok. Think Niklas sent a patch with mar/mor already. Will check which ones we depend on in user space.