1 #ifndef __IPC_NAMESPACE_H__
2 #define __IPC_NAMESPACE_H__
3
4 #include <linux/err.h>
5 #include <linux/idr.h>
6 #include <linux/rwsem.h>
7
8 struct ipc_ids {
9 int in_use;
10 unsigned short seq;
11 unsigned short seq_max;
12 struct rw_semaphore rw_mutex;
13 struct idr ipcs_idr;
14 };
15
16 struct ipc_namespace {
17 struct kref kref;
18 struct ipc_ids ids[3];
19
20 int sem_ctls[4];
21 int used_sems;
22
23 int msg_ctlmax;
24 int msg_ctlmnb;
25 int msg_ctlmni;
26 atomic_t msg_bytes;
27 atomic_t msg_hdrs;
28
29 size_t shm_ctlmax;
30 size_t shm_ctlall;
31 int shm_ctlmni;
32 int shm_tot;
33 };
34
35 extern struct ipc_namespace init_ipc_ns;
36
37 #ifdef CONFIG_SYSVIPC
38 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
39 #else
40 #define INIT_IPC_NS(ns)
41 #endif
42
43 #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
44 extern void free_ipc_ns(struct kref *kref);
45 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
46 struct ipc_namespace *ns);
47 extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
48 void (*free)(struct ipc_namespace *,
49 struct kern_ipc_perm *));
50
51 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
52 {
53 if (ns)
54 kref_get(&ns->kref);
55 return ns;
56 }
57
58 static inline void put_ipc_ns(struct ipc_namespace *ns)
59 {
60 kref_put(&ns->kref, free_ipc_ns);
61 }
62 #else
63 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
64 struct ipc_namespace *ns)
65 {
66 if (flags & CLONE_NEWIPC)
67 return ERR_PTR(-EINVAL);
68
69 return ns;
70 }
71
72 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
73 {
74 return ns;
75 }
76
77 static inline void put_ipc_ns(struct ipc_namespace *ns)
78 {
79 }
80 #endif
81 #endif
82
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