Hi!

> +++ b/Documentation/ABI/testing/sysfs-block
> @@ -316,3 +316,19 @@ Description:
>  		does not complete in this time then the block driver timeout
>  		handler is invoked. That timeout handler can decide to retry
>  		the request, to fail it or to start a device recovery strategy.
> +
> +What:		/sys/block/<disk>/led
> +Date:		August 2021
> +Contact:	Ian Pilcher <arequipeno@gmail.com>
> +Description:
> +		Set the LED associated with this block device (or show available
> +		LEDs and the currently selected LED, if any).
> +
> +		Reading the attribute will display the available LEDs (LEDs that
> +		are associated with the blkdev LED trigger).  The currently
> +		selected LED is enclosed in square brackets.  To clear the
> +		device's LED association write 'none' (without the quotes) or
> +		an empty string/line to the attribute.
> +
> +		See Documentation/ABI/testing/sysfs-class-led-trigger-blkdev and
> +		Documentation/block/blk-ledtrig.rst.)

I have to agree with Marek / Pali -- this is very strange interface.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek