IPC: make struct ipc_ids static in ipc_namespace
[linux-block.git] / ipc / namespace.c
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1/*
2 * linux/ipc/namespace.c
3 * Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.
4 */
5
6#include <linux/ipc.h>
7#include <linux/msg.h>
8#include <linux/ipc_namespace.h>
9#include <linux/rcupdate.h>
10#include <linux/nsproxy.h>
11#include <linux/slab.h>
12
13#include "util.h"
14
15static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
16{
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17 struct ipc_namespace *ns;
18
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19 ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
20 if (ns == NULL)
ed2ddbf8 21 return ERR_PTR(-ENOMEM);
ae5e1b22 22
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23 sem_init_ns(ns);
24 msg_init_ns(ns);
25 shm_init_ns(ns);
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26
27 kref_init(&ns->kref);
28 return ns;
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29}
30
31struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
32{
33 struct ipc_namespace *new_ns;
34
35 BUG_ON(!ns);
36 get_ipc_ns(ns);
37
38 if (!(flags & CLONE_NEWIPC))
39 return ns;
40
41 new_ns = clone_ipc_ns(ns);
42
43 put_ipc_ns(ns);
44 return new_ns;
45}
46
47void free_ipc_ns(struct kref *kref)
48{
49 struct ipc_namespace *ns;
50
51 ns = container_of(kref, struct ipc_namespace, kref);
52 sem_exit_ns(ns);
53 msg_exit_ns(ns);
54 shm_exit_ns(ns);
55 kfree(ns);
56}