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/workqueue.h>
8#include <linux/threads.h>
9#include <linux/nsproxy.h>
10#include <linux/kref.h>
11#include <linux/ns_common.h>
12
13struct pidmap {
14       atomic_t nr_free;
15       void *page;
16};
17
18#define BITS_PER_PAGE		(PAGE_SIZE * 8)
19#define BITS_PER_PAGE_MASK	(BITS_PER_PAGE-1)
20#define PIDMAP_ENTRIES		((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
21
22struct fs_pin;
23
24struct pid_namespace {
25	struct kref kref;
26	struct pidmap pidmap[PIDMAP_ENTRIES];
27	struct rcu_head rcu;
28	int last_pid;
29	unsigned int nr_hashed;
30	struct task_struct *child_reaper;
31	struct kmem_cache *pid_cachep;
32	unsigned int level;
33	struct pid_namespace *parent;
34#ifdef CONFIG_PROC_FS
35	struct vfsmount *proc_mnt;
36	struct dentry *proc_self;
37	struct dentry *proc_thread_self;
38#endif
39#ifdef CONFIG_BSD_PROCESS_ACCT
40	struct fs_pin *bacct;
41#endif
42	struct user_namespace *user_ns;
43	struct work_struct proc_work;
44	kgid_t pid_gid;
45	int hide_pid;
46	int reboot;	/* group exit code if this pidns was rebooted */
47	struct ns_common ns;
48};
49
50extern struct pid_namespace init_pid_ns;
51
52#define PIDNS_HASH_ADDING (1U << 31)
53
54#ifdef CONFIG_PID_NS
55static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
56{
57	if (ns != &init_pid_ns)
58		kref_get(&ns->kref);
59	return ns;
60}
61
62extern struct pid_namespace *copy_pid_ns(unsigned long flags,
63	struct user_namespace *user_ns, struct pid_namespace *ns);
64extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
65extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
66extern void put_pid_ns(struct pid_namespace *ns);
67
68#else /* !CONFIG_PID_NS */
69#include <linux/err.h>
70
71static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
72{
73	return ns;
74}
75
76static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
77	struct user_namespace *user_ns, struct pid_namespace *ns)
78{
79	if (flags & CLONE_NEWPID)
80		ns = ERR_PTR(-EINVAL);
81	return ns;
82}
83
84static inline void put_pid_ns(struct pid_namespace *ns)
85{
86}
87
88static inline void zap_pid_ns_processes(struct pid_namespace *ns)
89{
90	BUG();
91}
92
93static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
94{
95	return 0;
96}
97#endif /* CONFIG_PID_NS */
98
99extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
100void pidhash_init(void);
101void pidmap_init(void);
102
103#endif /* _LINUX_PID_NS_H */
104