Kay Sievers wrote:
>>
>>  Probably something like /sys/class/block/MAJ:MIN
>
> "Devices directories" are not supposed to contain duplicate entries.
> It would slow-down, or may even break things.
>
>> or /sys/class/devnums/bMAJ:MIN?
>
> These are no devices belonging to the class "devnums", so it may
> confuse things which crawl these directories to get "all devices".
> Current coldplug-like setups will likely add duplicate devices with
> the wrong subsystem. There are also bus-devices with have a dev_t, and
> that will make them show up in /sys/class, which might confuse some
> tools too.
>
> I guess we will need to find some other solution as a /sys/class/ for
> that. And we must prefix the links with 'c' and 'b' because dev_t is
> not unique across char and block devices.
>

It doesn't really seem to be to belong under class at all.  I would
suggest /sys/dev/char/ and /sys/dev/block/, for char and block respectively.

-hpa

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