diff --git a/kernel/pid.c b/kernel/pid.c
index 6eb1484..a2b4cbb 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -71,6 +71,7 @@
 	.level = 0,
 	.child_reaper = &init_task,
 };
+EXPORT_SYMBOL_GPL(init_pid_ns);
 
 int is_global_init(struct task_struct *tsk)
 {
@@ -210,7 +211,8 @@
 	unsigned long flags;
 
 	spin_lock_irqsave(&pidmap_lock, flags);
-	hlist_del_rcu(&pid->pid_chain);
+	for (i = 0; i <= pid->level; i++)
+		hlist_del_rcu(&pid->numbers[i].pid_chain);
 	spin_unlock_irqrestore(&pidmap_lock, flags);
 
 	for (i = 0; i <= pid->level; i++)
@@ -225,6 +227,7 @@
 	enum pid_type type;
 	int i, nr;
 	struct pid_namespace *tmp;
+	struct upid *upid;
 
 	pid = kmem_cache_alloc(ns->pid_cachep, GFP_KERNEL);
 	if (!pid)
@@ -251,7 +254,11 @@
 		INIT_HLIST_HEAD(&pid->tasks[type]);
 
 	spin_lock_irq(&pidmap_lock);
-	hlist_add_head_rcu(&pid->pid_chain, &pid_hash[pid_hashfn(pid->nr, ns)]);
+	for (i = ns->level; i >= 0; i--) {
+		upid = &pid->numbers[i];
+		hlist_add_head_rcu(&upid->pid_chain,
+				&pid_hash[pid_hashfn(upid->nr, upid->ns)]);
+	}
 	spin_unlock_irq(&pidmap_lock);
 
 out:
@@ -266,19 +273,20 @@
 	goto out;
 }
 
-struct pid * fastcall find_pid(int nr)
+struct pid * fastcall find_pid_ns(int nr, struct pid_namespace *ns)
 {
 	struct hlist_node *elem;
-	struct pid *pid;
+	struct upid *pnr;
 
-	hlist_for_each_entry_rcu(pid, elem,
-			&pid_hash[pid_hashfn(nr, &init_pid_ns)], pid_chain) {
-		if (pid->nr == nr)
-			return pid;
-	}
+	hlist_for_each_entry_rcu(pnr, elem,
+			&pid_hash[pid_hashfn(nr, ns)], pid_chain)
+		if (pnr->nr == nr && pnr->ns == ns)
+			return container_of(pnr, struct pid,
+					numbers[ns->level]);
+
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(find_pid);
+EXPORT_SYMBOL_GPL(find_pid_ns);
 
 /*
  * attach_pid() must be called with the tasklist_lock write-held.
@@ -338,12 +346,13 @@
 /*
  * Must be called under rcu_read_lock() or with tasklist_lock read-held.
  */
-struct task_struct *find_task_by_pid_type(int type, int nr)
+struct task_struct *find_task_by_pid_type_ns(int type, int nr,
+		struct pid_namespace *ns)
 {
-	return pid_task(find_pid(nr), type);
+	return pid_task(find_pid_ns(nr, ns), type);
 }
 
-EXPORT_SYMBOL(find_task_by_pid_type);
+EXPORT_SYMBOL(find_task_by_pid_type_ns);
 
 struct pid *get_task_pid(struct task_struct *task, enum pid_type type)
 {
@@ -370,7 +379,7 @@
 	struct pid *pid;
 
 	rcu_read_lock();
-	pid = get_pid(find_pid(nr));
+	pid = get_pid(find_vpid(nr));
 	rcu_read_unlock();
 
 	return pid;
@@ -394,15 +403,15 @@
  *
  * If there is a pid at nr this function is exactly the same as find_pid.
  */
-struct pid *find_ge_pid(int nr)
+struct pid *find_ge_pid(int nr, struct pid_namespace *ns)
 {
 	struct pid *pid;
 
 	do {
-		pid = find_pid(nr);
+		pid = find_pid_ns(nr, ns);
 		if (pid)
 			break;
-		nr = next_pidmap(task_active_pid_ns(current), nr);
+		nr = next_pidmap(ns, nr);
 	} while (nr > 0);
 
 	return pid;