On 9/4/21 1:29 AM, Pavel Machek wrote:

quoted

+What:		/sys/class/leds/<led>/add_blkdev
+Date:		September 2021
+Contact:	Ian Pilcher [off-list ref]
+Description:
+		Associate a block device with this LED by writing its kernel
+		name (as shown in /sys/block) to this attribute.  Multiple
+		device names may be written at once, separated by whitespace.

This is seriously strange interface.

It's the netdev-like interface that Marek described in an earlier note
(adapted for the fact that the trigger supports many-to-many
relationships).

If you have directory with symlinks, why not use symlink() syscall
instead of add_blkdev, and unlink() syscall instead of delete_blkdev?

I'd actually had that thought as well, but I didn't see any obvious way
to do that in sysfs when I looked.  If you know how to do it or know of
an example, please let me know.

If using symlink()/unlink() isn't an option, do you have a suggestion
for a less seriously strange interface?

Thanks!

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