block: introduce bdev_dma_alignment helper
Preparing for upcoming dma_alignment users that have a block_device, but don't need the request_queue. Signed-off-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220610195830.3574005-5-kbusch@fb.comSigned-off-by: Jens Axboe <axboe@kernel.dk>
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