block: remove q->prepare_flush_fn completely
This removes q->prepare_flush_fn completely (changes the blk_queue_ordered API). Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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