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ae5e1b22 PE |
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 | ||
15 | static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns) | |
16 | { | |
ae5e1b22 PE |
17 | struct ipc_namespace *ns; |
18 | ||
ae5e1b22 PE |
19 | ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL); |
20 | if (ns == NULL) | |
ed2ddbf8 | 21 | return ERR_PTR(-ENOMEM); |
ae5e1b22 | 22 | |
ed2ddbf8 PP |
23 | sem_init_ns(ns); |
24 | msg_init_ns(ns); | |
25 | shm_init_ns(ns); | |
ae5e1b22 PE |
26 | |
27 | kref_init(&ns->kref); | |
28 | return ns; | |
ae5e1b22 PE |
29 | } |
30 | ||
31 | struct 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 | ||
47 | void 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 | } |