On Mon, Jan 25 2021 at  7:13am -0500,
Jeffle Xu [off-list ref] wrote:

Sometimes we need to get the corresponding gendisk from request_queue.

It is preferred that block drivers store private data in
gendisk->private_data rather than request_queue->queuedata, e.g. see:
commit c4a59c4e5db3 ("dm: stop using ->queuedata").

So if only request_queue is given, we need to get its corresponding
gendisk to get the private data stored in that gendisk.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Review-by: Mike Snitzer [off-list ref]

^typo

Reviewed-by: Mike Snitzer <redacted>