1 files changed, 115 insertions, 0 deletions

diff --git a/lib/kobject.c b/lib/kobject.c
index 8115eb1bbf4d..f07c57252e82 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -850,6 +850,121 @@ struct kset *kset_create_and_add(const char *name,
 }
 EXPORT_SYMBOL_GPL(kset_create_and_add);
 
+
+static DEFINE_SPINLOCK(kobj_ns_type_lock);
+static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
+
+int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
+{
+        enum kobj_ns_type type = ops->type;
+        int error;
+
+        spin_lock(&kobj_ns_type_lock);
+
+        error = -EINVAL;
+        if (type >= KOBJ_NS_TYPES)
+                goto out;
+
+        error = -EINVAL;
+        if (type <= KOBJ_NS_TYPE_NONE)
+                goto out;
+
+        error = -EBUSY;
+        if (kobj_ns_ops_tbl[type])
+                goto out;
+
+        error = 0;
+        kobj_ns_ops_tbl[type] = ops;
+
+out:
+        spin_unlock(&kobj_ns_type_lock);
+        return error;
+}
+
+int kobj_ns_type_registered(enum kobj_ns_type type)
+{
+        int registered = 0;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
+                registered = kobj_ns_ops_tbl[type] != NULL;
+        spin_unlock(&kobj_ns_type_lock);
+
+        return registered;
+}
+
+const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
+{
+        const struct kobj_ns_type_operations *ops = NULL;
+
+        if (parent && parent->ktype->child_ns_type)
+                ops = parent->ktype->child_ns_type(parent);
+
+        return ops;
+}
+
+const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
+{
+        return kobj_child_ns_ops(kobj->parent);
+}
+
+
+const void *kobj_ns_current(enum kobj_ns_type type)
+{
+        const void *ns = NULL;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+            kobj_ns_ops_tbl[type])
+                ns = kobj_ns_ops_tbl[type]->current_ns();
+        spin_unlock(&kobj_ns_type_lock);
+
+        return ns;
+}
+
+const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
+{
+        const void *ns = NULL;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+            kobj_ns_ops_tbl[type])
+                ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
+        spin_unlock(&kobj_ns_type_lock);
+
+        return ns;
+}
+
+const void *kobj_ns_initial(enum kobj_ns_type type)
+{
+        const void *ns = NULL;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+            kobj_ns_ops_tbl[type])
+                ns = kobj_ns_ops_tbl[type]->initial_ns();
+        spin_unlock(&kobj_ns_type_lock);
+
+        return ns;
+}
+
+/*
+ * kobj_ns_exit - invalidate a namespace tag
+ *
+ * @type: the namespace type (i.e. KOBJ_NS_TYPE_NET)
+ * @ns: the actual namespace being invalidated
+ *
+ * This is called when a tag is no longer valid.  For instance,
+ * when a network namespace exits, it uses this helper to
+ * make sure no sb's sysfs_info points to the now-invalidated
+ * netns.
+ */
+void kobj_ns_exit(enum kobj_ns_type type, const void *ns)
+{
+        sysfs_exit_ns(type, ns);
+}
+
+
 EXPORT_SYMBOL(kobject_get);
 EXPORT_SYMBOL(kobject_put);
 EXPORT_SYMBOL(kobject_del);