From 024f9320b3288f7994e22adf272222ef23f69e61 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Fri, 9 Nov 2012 09:12:29 -0800
Subject: [PATCH] --- yaml --- r: 339322 b: refs/heads/master c:
 a8638030f668884720b8f4456448d0ce33952b05 h: refs/heads/master v: v3

---
 [refs]                       |  2 +-
 trunk/include/linux/cgroup.h |  1 +
 trunk/kernel/cgroup.c        | 15 +++++++++++++--
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index fe146836f412..47a220fe8dae 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 316eb661f125397d46f16f94e3c81ad3dc4c1233
+refs/heads/master: a8638030f668884720b8f4456448d0ce33952b05
diff --git a/trunk/include/linux/cgroup.h b/trunk/include/linux/cgroup.h
index fe876a77031a..b4421221111d 100644
--- a/trunk/include/linux/cgroup.h
+++ b/trunk/include/linux/cgroup.h
@@ -438,6 +438,7 @@ int cgroup_taskset_size(struct cgroup_taskset *tset);
 
 struct cgroup_subsys {
 	struct cgroup_subsys_state *(*create)(struct cgroup *cgrp);
+	void (*post_create)(struct cgroup *cgrp);
 	void (*pre_destroy)(struct cgroup *cgrp);
 	void (*destroy)(struct cgroup *cgrp);
 	int (*can_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
diff --git a/trunk/kernel/cgroup.c b/trunk/kernel/cgroup.c
index 998ab5957c6a..26f2edbaf4f5 100644
--- a/trunk/kernel/cgroup.c
+++ b/trunk/kernel/cgroup.c
@@ -4059,10 +4059,15 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 	if (err < 0)
 		goto err_remove;
 
-	/* each css holds a ref to the cgroup's dentry */
-	for_each_subsys(root, ss)
+	for_each_subsys(root, ss) {
+		/* each css holds a ref to the cgroup's dentry */
 		dget(dentry);
 
+		/* creation succeeded, notify subsystems */
+		if (ss->post_create)
+			ss->post_create(cgrp);
+	}
+
 	/* The cgroup directory was pre-locked for us */
 	BUG_ON(!mutex_is_locked(&cgrp->dentry->d_inode->i_mutex));
 
@@ -4280,6 +4285,9 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
 
 	ss->active = 1;
 
+	if (ss->post_create)
+		ss->post_create(&ss->root->top_cgroup);
+
 	/* this function shouldn't be used with modular subsystems, since they
 	 * need to register a subsys_id, among other things */
 	BUG_ON(ss->module);
@@ -4389,6 +4397,9 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
 
 	ss->active = 1;
 
+	if (ss->post_create)
+		ss->post_create(&ss->root->top_cgroup);
+
 	/* success! */
 	mutex_unlock(&cgroup_mutex);
 	return 0;