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

[Keith Busch]

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.