blob: 07baa38bce3708b52921b2baccd45f095dc753df [file] [log] [blame]
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -08001#ifndef __IPC_NAMESPACE_H__
2#define __IPC_NAMESPACE_H__
3
4#include <linux/err.h>
Pierre Peiffered2ddbf2008-02-08 04:18:57 -08005#include <linux/idr.h>
6#include <linux/rwsem.h>
Nadia Derbeyb6b337a2008-04-29 01:00:42 -07007#include <linux/notifier.h>
Nadia Derbeyb6b337a2008-04-29 01:00:42 -07008
9/*
10 * ipc namespace events
11 */
12#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
Nadia Derbeye2c284d2008-04-29 01:00:44 -070013#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
14#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070015
16#define IPCNS_CALLBACK_PRI 0
17
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080018
Pierre Peiffered2ddbf2008-02-08 04:18:57 -080019struct ipc_ids {
20 int in_use;
21 unsigned short seq;
22 unsigned short seq_max;
23 struct rw_semaphore rw_mutex;
24 struct idr ipcs_idr;
25};
26
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080027struct ipc_namespace {
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070028 atomic_t count;
Pierre Peiffered2ddbf2008-02-08 04:18:57 -080029 struct ipc_ids ids[3];
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080030
31 int sem_ctls[4];
32 int used_sems;
33
34 int msg_ctlmax;
35 int msg_ctlmnb;
36 int msg_ctlmni;
37 atomic_t msg_bytes;
38 atomic_t msg_hdrs;
Nadia Derbey9eefe522008-07-25 01:48:08 -070039 int auto_msgmni;
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080040
41 size_t shm_ctlmax;
42 size_t shm_ctlall;
43 int shm_ctlmni;
44 int shm_tot;
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070045
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070046 struct notifier_block ipcns_nb;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070047
48 /* The kern_mount of the mqueuefs sb. We take a ref on it */
49 struct vfsmount *mq_mnt;
50
51 /* # queues in this ns, protected by mq_lock */
52 unsigned int mq_queues_count;
53
54 /* next fields are set through sysctl */
55 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
56 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
57 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
58
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080059};
60
61extern struct ipc_namespace init_ipc_ns;
Nadia Derbey4d89dc62008-04-29 01:00:40 -070062extern atomic_t nr_ipc_ns;
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080063
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070064extern spinlock_t mq_lock;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070065#if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080066#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070067#else
68#define INIT_IPC_NS(ns)
69#endif
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070070
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070071#ifdef CONFIG_SYSVIPC
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070072extern int register_ipcns_notifier(struct ipc_namespace *);
Nadia Derbey6546bc42008-04-29 01:00:45 -070073extern int cond_register_ipcns_notifier(struct ipc_namespace *);
Nadia Derbey9eefe522008-07-25 01:48:08 -070074extern void unregister_ipcns_notifier(struct ipc_namespace *);
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070075extern int ipcns_notify(unsigned long);
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070076#else /* CONFIG_SYSVIPC */
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070077static inline int register_ipcns_notifier(struct ipc_namespace *ns)
78{ return 0; }
79static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
80{ return 0; }
81static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
82static inline int ipcns_notify(unsigned long l) { return 0; }
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070083#endif /* CONFIG_SYSVIPC */
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080084
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070085#ifdef CONFIG_POSIX_MQUEUE
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070086extern int mq_init_ns(struct ipc_namespace *ns);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070087/* default values */
88#define DFLT_QUEUESMAX 256 /* max number of message queues */
89#define DFLT_MSGMAX 10 /* max number of messages in each queue */
Amerigo Wang9cf18e12009-12-15 16:47:36 -080090#define HARD_MSGMAX (32768*sizeof(void *)/4)
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070091#define DFLT_MSGSIZEMAX 8192 /* max message size */
92#else
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070093static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070094#endif
95
96#if defined(CONFIG_IPC_NS)
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080097extern struct ipc_namespace *copy_ipcs(unsigned long flags,
Pierre Peiffer01b8b072008-02-08 04:18:57 -080098 struct ipc_namespace *ns);
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080099static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
100{
101 if (ns)
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700102 atomic_inc(&ns->count);
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800103 return ns;
104}
105
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700106extern void put_ipc_ns(struct ipc_namespace *ns);
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800107#else
108static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
109 struct ipc_namespace *ns)
110{
111 if (flags & CLONE_NEWIPC)
112 return ERR_PTR(-EINVAL);
113
114 return ns;
115}
116
117static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
118{
119 return ns;
120}
121
122static inline void put_ipc_ns(struct ipc_namespace *ns)
123{
124}
125#endif
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -0700126
127#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
128
129struct ctl_table_header;
130extern struct ctl_table_header *mq_register_sysctl_table(void);
131
132#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
133
134static inline struct ctl_table_header *mq_register_sysctl_table(void)
135{
136 return NULL;
137}
138
139#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800140#endif