block: add queue_to_disk() to get gendisk from request_queue

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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 c4a59c4e5d ("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.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

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Jeffle Xu 2021-04-01 10:19:25 +08:00 • committed by Jens Axboe

parent cbb749cf37

commit 907d523100

2 changed files with 5 additions and 3 deletions

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2

include/linux/blkdev.h

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6

include/trace/events/kyber.h

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