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| author | weiping zhang <zhangweiping@didichuxing.com> | 2017-10-17 23:56:21 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-11-04 12:31:15 -0600 |
| commit | e84010732225c4c7c3464ee1169d395751c3adfa (patch) | |
| tree | e2d58f0a0f73d03edaa383e6fba1b2a9f15cd134 | |
| parent | 88022d7201e96b43f1754b0358fc6bcd8dbdcde1 (diff) | |
| download | linux-e84010732225c4c7c3464ee1169d395751c3adfa.tar.gz linux-e84010732225c4c7c3464ee1169d395751c3adfa.tar.bz2 linux-e84010732225c4c7c3464ee1169d395751c3adfa.zip | |
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>
| -rw-r--r-- | block/blk-cgroup.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index e7ec676043b1..4117524ca45b 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -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; |