blk-mq: blk_mq_tag_to_rq should handle flush request
flush request is special, which borrows the tag from the parent request. Hence blk_mq_tag_to_rq needs special handling to return the flush request from the tag. Signed-off-by: NShaohua Li <shli@fusionio.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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