kobj: Add basic infrastructure for dealing with namespaces.
Move complete knowledge of namespaces into the kobject layer
so we can use that information when reporting kobjects to
userspace.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/lib/kobject.c b/lib/kobject.c
index 8115eb1..bbb2bb4 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -850,6 +850,109 @@
}
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;
+}
+
+void kobj_ns_exit(enum kobj_ns_type type, const void *ns)
+{
+}
+
+
EXPORT_SYMBOL(kobject_get);
EXPORT_SYMBOL(kobject_put);
EXPORT_SYMBOL(kobject_del);