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Commit e8401073 authored by weiping zhang's avatar weiping zhang Committed by Jens Axboe
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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: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarweiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 88022d72

block/blk-cgroup.c

+5 −0
Original line number Diff line number Diff line
@@ -1419,6 +1419,11 @@ int blkcg_policy_register(struct blkcg_policy *pol) 
	if (i >= BLKCG_MAX_POLS)

		goto err_unlock;



	/* Make sure cpd/pd_alloc_fn and cpd/pd_free_fn in pairs */

	if ((!pol->cpd_alloc_fn ^ !pol->cpd_free_fn) ||

		(!pol->pd_alloc_fn ^ !pol->pd_free_fn))

		goto err_unlock;



	/* register @pol */

	pol->plid = i;

	blkcg_policy[pol->plid] = pol;