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 {
17 struct ipc_namespace *ns;
18
19 ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
20 if (ns == NULL)
21 return ERR_PTR(-ENOMEM);
22
23 sem_init_ns(ns);
24 msg_init_ns(ns);
25 shm_init_ns(ns);
26
27 kref_init(&ns->kref);
28 return ns;
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 /*
48 * free_ipcs - free all ipcs of one type
49 * @ns: the namespace to remove the ipcs from
50 * @ids: the table of ipcs to free
51 * @free: the function called to free each individual ipc
52 *
53 * Called for each kind of ipc when an ipc_namespace exits.
54 */
55 void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
56 void (*free)(struct ipc_namespace *, struct kern_ipc_perm *))
57 {
58 struct kern_ipc_perm *perm;
59 int next_id;
60 int total, in_use;
61
62 down_write(&ids->rw_mutex);
63
64 in_use = ids->in_use;
65
66 for (total = 0, next_id = 0; total < in_use; next_id++) {
67 perm = idr_find(&ids->ipcs_idr, next_id);
68 if (perm == NULL)
69 continue;
70 ipc_lock_by_ptr(perm);
71 free(ns, perm);
72 total++;
73 }
74 up_write(&ids->rw_mutex);
75 }
76
77 void free_ipc_ns(struct kref *kref)
78 {
79 struct ipc_namespace *ns;
80
81 ns = container_of(kref, struct ipc_namespace, kref);
82 sem_exit_ns(ns);
83 msg_exit_ns(ns);
84 shm_exit_ns(ns);
85 kfree(ns);
86 }
87
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