Comment # 1 on bug 1216717 from Martin Wilck

Thanks for the report.

The sysfs attributes "nr_requests", "scheduler", "rq_affinity", "io_timeout",
and "wb_lat_usec" are only relevant for request-based queues and have been made
invisible with kernel commit 6d85ebf95c44 ("blk-sysfs: add a new attr_group for
blk_mq") in kernel v6.5-rc1 and newer.