dm: convert to blk_alloc_disk/blk_cleanup_disk
Convert the dm driver to use the blk_alloc_disk and blk_cleanup_disk helpers to simplify gendisk and request_queue allocation. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Link: https://lore.kernel.org/r/20210521055116.1053587-14-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>
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