cciss: Add usage_count attribute to each logical drive in /sys
Add usage_count attribute to each logical drive at /sys/devices/<dev>/ccissX/cXdY/usage_count for controller X, logical drive Y. The usage count is the number of times the device has currently been opened. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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