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>

3 files changed, 8 insertions, 3 deletions

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index d9c3ae6afe4c..65c13dddceae 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 e40b8f6e5d0e..e73ba33cbf08 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 07c6b879c8b2..e998c6448046 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: