Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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#include <linux/notifier.h>
8#include <linux/nsproxy.h>
9
10/*
11 * ipc namespace events
12 */
13#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
14#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
15#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
16
17#define IPCNS_CALLBACK_PRI 0
18
19struct user_namespace;
20
21struct ipc_ids {
22 int in_use;
23 unsigned short seq;
24 unsigned short seq_max;
25 struct rw_semaphore rw_mutex;
26 struct idr ipcs_idr;
27};
28
29struct ipc_namespace {
30 atomic_t count;
31 struct ipc_ids ids[3];
32
33 int sem_ctls[4];
34 int used_sems;
35
36 int msg_ctlmax;
37 int msg_ctlmnb;
38 int msg_ctlmni;
39 atomic_t msg_bytes;
40 atomic_t msg_hdrs;
41 int auto_msgmni;
42
43 size_t shm_ctlmax;
44 size_t shm_ctlall;
45 int shm_ctlmni;
46 int shm_tot;
47
48 struct notifier_block ipcns_nb;
49
50 /* The kern_mount of the mqueuefs sb. We take a ref on it */
51 struct vfsmount *mq_mnt;
52
53 /* # queues in this ns, protected by mq_lock */
54 unsigned int mq_queues_count;
55
56 /* next fields are set through sysctl */
57 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
58 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
59 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
60
61 /* user_ns which owns the ipc ns */
62 struct user_namespace *user_ns;
63};
64
65extern struct ipc_namespace init_ipc_ns;
66extern atomic_t nr_ipc_ns;
67
68extern spinlock_t mq_lock;
69
70#ifdef CONFIG_SYSVIPC
71extern int register_ipcns_notifier(struct ipc_namespace *);
72extern int cond_register_ipcns_notifier(struct ipc_namespace *);
73extern void unregister_ipcns_notifier(struct ipc_namespace *);
74extern int ipcns_notify(unsigned long);
75#else /* CONFIG_SYSVIPC */
76static inline int register_ipcns_notifier(struct ipc_namespace *ns)
77{ return 0; }
78static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
79{ return 0; }
80static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
81static inline int ipcns_notify(unsigned long l) { return 0; }
82#endif /* CONFIG_SYSVIPC */
83
84#ifdef CONFIG_POSIX_MQUEUE
85extern int mq_init_ns(struct ipc_namespace *ns);
86/* default values */
87#define DFLT_QUEUESMAX 256 /* max number of message queues */
88#define DFLT_MSGMAX 10 /* max number of messages in each queue */
89#define HARD_MSGMAX (32768*sizeof(void *)/4)
90#define DFLT_MSGSIZEMAX 8192 /* max message size */
91#else
92static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
93#endif
94
95#if defined(CONFIG_IPC_NS)
96extern struct ipc_namespace *copy_ipcs(unsigned long flags,
97 struct task_struct *tsk);
98static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
99{
100 if (ns)
101 atomic_inc(&ns->count);
102 return ns;
103}
104
105extern void put_ipc_ns(struct ipc_namespace *ns);
106#else
107static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
108 struct task_struct *tsk)
109{
110 if (flags & CLONE_NEWIPC)
111 return ERR_PTR(-EINVAL);
112
113 return tsk->nsproxy->ipc_ns;
114}
115
116static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
117{
118 return ns;
119}
120
121static inline void put_ipc_ns(struct ipc_namespace *ns)
122{
123}
124#endif
125
126#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
127
128struct ctl_table_header;
129extern struct ctl_table_header *mq_register_sysctl_table(void);
130
131#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
132
133static inline struct ctl_table_header *mq_register_sysctl_table(void)
134{
135 return NULL;
136}
137
138#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
139#endif