blkcg: add sanity check for blkcg policy operations
blkcg policy should keep cpd/pd's alloc_fn and free_fn in pairs, otherwise policy would register fail. Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: weiping zhang <zhangweiping@didichuxing.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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