On 9/9/21 9:17 PM, Marek Behún wrote:

So your code allows me to use a partition block device (like sda2) to
register with the blkdev LED trigger, but when I do this, the code will
disregard that I just want the LED to blink on activity on that one
partition. Instead you will blink for whole sda, since you are looking
at stats of only part0.

Am I right?

You can't add partitions, only whole devices.

# echo vda2 > link_device
-bash: echo: write error: No such device

static int blkdev_match_name(struct device *const dev, const void *const 
name)
{
	return dev->type == &disk_type
			&& sysfs_streq(dev_to_disk(dev)->disk_name, name);
}

Partitions fail the dev->type == &disk_type check.

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