Linux Kernel  3.7.1
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pid_namespace.h
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1 #ifndef _LINUX_PID_NS_H
2 #define _LINUX_PID_NS_H
3 
4 #include <linux/sched.h>
5 #include <linux/bug.h>
6 #include <linux/mm.h>
7 #include <linux/threads.h>
8 #include <linux/nsproxy.h>
9 #include <linux/kref.h>
10 
11 struct pidmap {
13  void *page;
14 };
15 
16 #define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
17 
18 struct bsd_acct_struct;
19 
20 struct pid_namespace {
21  struct kref kref;
23  int last_pid;
26  unsigned int level;
28 #ifdef CONFIG_PROC_FS
29  struct vfsmount *proc_mnt;
30 #endif
31 #ifdef CONFIG_BSD_PROCESS_ACCT
32  struct bsd_acct_struct *bacct;
33 #endif
35  int hide_pid;
36  int reboot; /* group exit code if this pidns was rebooted */
37 };
38 
39 extern struct pid_namespace init_pid_ns;
40 
41 #ifdef CONFIG_PID_NS
42 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
43 {
44  if (ns != &init_pid_ns)
45  kref_get(&ns->kref);
46  return ns;
47 }
48 
49 extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
50 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
51 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
52 extern void put_pid_ns(struct pid_namespace *ns);
53 
54 #else /* !CONFIG_PID_NS */
55 #include <linux/err.h>
56 
57 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
58 {
59  return ns;
60 }
61 
62 static inline struct pid_namespace *
63 copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
64 {
65  if (flags & CLONE_NEWPID)
66  ns = ERR_PTR(-EINVAL);
67  return ns;
68 }
69 
70 static inline void put_pid_ns(struct pid_namespace *ns)
71 {
72 }
73 
74 static inline void zap_pid_ns_processes(struct pid_namespace *ns)
75 {
76  BUG();
77 }
78 
79 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
80 {
81  return 0;
82 }
83 #endif /* CONFIG_PID_NS */
84 
85 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
86 void pidhash_init(void);
87 void pidmap_init(void);
88 
89 #endif /* _LINUX_PID_NS_H */