From 9eb47c26f09e27506d343ef52e634b2a50ee21ef Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Sun, 22 Jan 2012 21:26:00 -0800
Subject: sysctl: Add a root pointer to ctl_table_set

Add a ctl_table_root pointer to ctl_table set so it is easy to
go from a ctl_table_set to a ctl_table_root.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index d9c3ae6..65c13dd 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -45,6 +45,7 @@ static struct ctl_table_header root_table_header = {
 static struct ctl_table_root sysctl_table_root = {
 	.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 	.default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
+	.default_set.root = &sysctl_table_root,
 };
 
 static DEFINE_SPINLOCK(sysctl_lock);
@@ -1348,9 +1349,11 @@ void unregister_sysctl_table(struct ctl_table_header * header)
 EXPORT_SYMBOL(unregister_sysctl_table);
 
 void setup_sysctl_set(struct ctl_table_set *p,
+	struct ctl_table_root *root,
 	int (*is_seen)(struct ctl_table_set *))
 {
 	INIT_LIST_HEAD(&p->list);
+	p->root = root;
 	p->is_seen = is_seen;
 }
 
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index e40b8f6..e73ba33 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1047,6 +1047,7 @@ struct ctl_table_header
 
 struct ctl_table_set {
 	struct list_head list;
+	struct ctl_table_root *root;
 	int (*is_seen)(struct ctl_table_set *);
 };
 
@@ -1069,6 +1070,7 @@ struct ctl_path {
 void proc_sys_poll_notify(struct ctl_table_poll *poll);
 
 extern void setup_sysctl_set(struct ctl_table_set *p,
+	struct ctl_table_root *root,
 	int (*is_seen)(struct ctl_table_set *));
 extern void retire_sysctl_set(struct ctl_table_set *set);
 
@@ -1103,6 +1105,7 @@ static inline void unregister_sysctl_table(struct ctl_table_header * table)
 }
 
 static inline void setup_sysctl_set(struct ctl_table_set *p,
+	struct ctl_table_root *root,
 	int (*is_seen)(struct ctl_table_set *))
 {
 }
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 07c6b87..e998c64 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -74,8 +74,7 @@ static struct ctl_table_root net_sysctl_ro_root = {
 
 static int __net_init sysctl_net_init(struct net *net)
 {
-	setup_sysctl_set(&net->sysctls,
-			 is_seen);
+	setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
 	return 0;
 }
 
@@ -95,7 +94,7 @@ static __init int net_sysctl_init(void)
 	ret = register_pernet_subsys(&sysctl_pernet_ops);
 	if (ret)
 		goto out;
-	setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL);
+	setup_sysctl_set(&net_sysctl_ro_root.default_set, &net_sysctl_ro_root, NULL);
 	register_sysctl_root(&net_sysctl_ro_root);
 	register_sysctl_root(&net_sysctl_root);
 out:
-- 
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