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blkcg: implement all_blkcgs list

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Add all_blkcgs list goes through blkcg->all_blkcgs_node and is
protected by blkcg_pol_mutex.  This will be used to fix
blkcg_policy_data allocation bug.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Arianna Avanzini <avanzini.arianna@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo
2015-07-09 16:39:49 -04:00
committed by Jens Axboe
parent 144232b342
commit 7876f930d0
2 changed files with 13 additions and 5 deletions
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include/linux/blk-cgroup.h
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@@ -47,6 +47,7 @@ struct blkcg {
struct blkcg_policy_data *pd[BLKCG_MAX_POLS];
struct list_head all_blkcgs_node;
#ifdef CONFIG_CGROUP_WRITEBACK
struct list_head cgwb_list;
#endif