Commit e8401073 authored by weiping zhang's avatar weiping zhang Committed by Jens Axboe

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: 's avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: 's avatarweiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: 's avatarJens Axboe <axboe@kernel.dk>
parent 88022d72
......@@ -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;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment