umount_tree(root, &umount_list);
umount_tree(root, 0, &umount_list);
void __put_namespace(struct namespace *namespace){	struct vfsmount *root = namespace->root;	LIST_HEAD(umount_list);	namespace->root = NULL;	spin_unlock(&vfsmount_lock);	down_write(&namespace_sem);	spin_lock(&vfsmount_lock);	umount_tree(root, &umount_list);	spin_unlock(&vfsmount_lock);	up_write(&namespace_sem);	release_mounts(&umount_list);	kfree(namespace);}