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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/mm.h>
6 #include <linux/threads.h>
7 #include <linux/nsproxy.h>
8 #include <linux/kref.h>
9 
10 struct pidmap {
11        atomic_t nr_free;
12        void *page;
13 };
14 
15 #define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
16 
17 struct bsd_acct_struct;
18 
19 struct pid_namespace {
20 	struct kref kref;
21 	struct pidmap pidmap[PIDMAP_ENTRIES];
22 	int last_pid;
23 	struct task_struct *child_reaper;
24 	struct kmem_cache *pid_cachep;
25 	unsigned int level;
26 	struct pid_namespace *parent;
27 #ifdef CONFIG_PROC_FS
28 	struct vfsmount *proc_mnt;
29 #endif
30 #ifdef CONFIG_BSD_PROCESS_ACCT
31 	struct bsd_acct_struct *bacct;
32 #endif
33 };
34 
35 extern struct pid_namespace init_pid_ns;
36 
37 #ifdef CONFIG_PID_NS
get_pid_ns(struct pid_namespace * ns)38 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
39 {
40 	if (ns != &init_pid_ns)
41 		kref_get(&ns->kref);
42 	return ns;
43 }
44 
45 extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
46 extern void free_pid_ns(struct kref *kref);
47 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
48 
put_pid_ns(struct pid_namespace * ns)49 static inline void put_pid_ns(struct pid_namespace *ns)
50 {
51 	if (ns != &init_pid_ns)
52 		kref_put(&ns->kref, free_pid_ns);
53 }
54 
55 #else /* !CONFIG_PID_NS */
56 #include <linux/err.h>
57 
get_pid_ns(struct pid_namespace * ns)58 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
59 {
60 	return ns;
61 }
62 
63 static inline struct pid_namespace *
copy_pid_ns(unsigned long flags,struct pid_namespace * ns)64 copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
65 {
66 	if (flags & CLONE_NEWPID)
67 		ns = ERR_PTR(-EINVAL);
68 	return ns;
69 }
70 
put_pid_ns(struct pid_namespace * ns)71 static inline void put_pid_ns(struct pid_namespace *ns)
72 {
73 }
74 
75 
zap_pid_ns_processes(struct pid_namespace * ns)76 static inline void zap_pid_ns_processes(struct pid_namespace *ns)
77 {
78 	BUG();
79 }
80 #endif /* CONFIG_PID_NS */
81 
82 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
83 void pidhash_init(void);
84 void pidmap_init(void);
85 
86 #endif /* _LINUX_PID_NS_H */
87