On Thu, May 11, 2023 at 09:45:06AM +0800, Yu Kuai wrote: > From: Yu Kuai <yukuai3@xxxxxxxxxx> > > Because rq_qos only make sense for rq based device. Instead of fail > from sysfs configuration, make wbt sysfs dentry invisible directly. This looks ok, bt I would be better to just have a separate attr group just for blk-mq based devices?