blkcg: blk-iocost: predeclare used structs
Fixes: 7caa4715 ("blkcg: implement blk-iocost") Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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