From 7ee9c5620504906e98451dc9a1945b2b9e892cb8 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 5 Mar 2012 13:15:11 -0800 Subject: blkcg: let blkio_group point to blkio_cgroup directly Currently, blkg points to the associated blkcg via its css_id. This unnecessarily complicates dereferencing blkcg. Let blkg hold a reference to the associated blkcg and point directly to it and disable css_id on blkio_subsys. This change requires splitting blkiocg_destroy() into blkiocg_pre_destroy() and blkiocg_destroy() so that all blkg's can be destroyed and all the blkcg references held by them dropped during cgroup removal. Signed-off-by: Tejun Heo Cc: Vivek Goyal Signed-off-by: Jens Axboe --- block/blk-cgroup.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block/blk-cgroup.h') diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 7ebecf6ea8f..ca1fc637bd6 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -163,7 +163,7 @@ struct blkio_group { /* Pointer to the associated request_queue, RCU protected */ struct request_queue __rcu *q; struct hlist_node blkcg_node; - unsigned short blkcg_id; + struct blkio_cgroup *blkcg; /* Store cgroup path */ char path[128]; /* policy which owns this blk group */ -- cgit v1.2.3-18-g5258