sysfs: Implement sysfs tagged directory support.

[firefly-linux-kernel-4.4.55.git] / lib / kobject.c

diff --git a/lib/kobject.c b/lib/kobject.c
index 8115eb1bbf4dc198cc5f9a725c40f4a6afd0e414..b2c6d1f56e657a4817ccd6c13b70ba90a4b994f0 100644 (file)
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -850,6 +850,110 @@ 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;
+}
+
+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);