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Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -08001#ifndef _LINUX_PID_NS_H
2#define _LINUX_PID_NS_H
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -07003
4#include <linux/sched.h>
5#include <linux/mm.h>
6#include <linux/threads.h>
Cedric Le Goater9a575a92006-12-08 02:37:59 -08007#include <linux/nsproxy.h>
8#include <linux/kref.h>
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -07009
10struct 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
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -080017struct pid_namespace {
Cedric Le Goater9a575a92006-12-08 02:37:59 -080018 struct kref kref;
19 struct pidmap pidmap[PIDMAP_ENTRIES];
20 int last_pid;
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080021 struct task_struct *child_reaper;
Pavel Emelianovbaf8f0f2007-10-18 23:39:48 -070022 struct kmem_cache *pid_cachep;
Pavel Emelyanovcaafa432008-04-30 00:54:31 -070023 unsigned int level;
Pavel Emelyanovfaacbfd2007-10-18 23:40:04 -070024 struct pid_namespace *parent;
Pavel Emelyanov07543f52007-10-18 23:40:08 -070025#ifdef CONFIG_PROC_FS
26 struct vfsmount *proc_mnt;
27#endif
Sukadev Bhattiprolu3fbc9642006-10-02 02:17:24 -070028};
29
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -080030extern struct pid_namespace init_pid_ns;
Sukadev Bhattiprolu3fbc9642006-10-02 02:17:24 -070031
Eric W. Biederman57d5f662007-11-14 17:00:13 -080032#ifdef CONFIG_PID_NS
Pavel Emelianova05f7b12007-10-18 23:39:47 -070033static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
Cedric Le Goater9a575a92006-12-08 02:37:59 -080034{
Pavel Emelyanovb461cc02007-10-18 23:40:09 -070035 if (ns != &init_pid_ns)
36 kref_get(&ns->kref);
Pavel Emelianova05f7b12007-10-18 23:39:47 -070037 return ns;
Cedric Le Goater9a575a92006-12-08 02:37:59 -080038}
39
Eric W. Biederman213dd262007-07-15 23:41:15 -070040extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
Cedric Le Goater9a575a92006-12-08 02:37:59 -080041extern void free_pid_ns(struct kref *kref);
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -080042extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
Cedric Le Goater9a575a92006-12-08 02:37:59 -080043
44static inline void put_pid_ns(struct pid_namespace *ns)
45{
Pavel Emelyanovb461cc02007-10-18 23:40:09 -070046 if (ns != &init_pid_ns)
47 kref_put(&ns->kref, free_pid_ns);
Cedric Le Goater9a575a92006-12-08 02:37:59 -080048}
49
Eric W. Biederman57d5f662007-11-14 17:00:13 -080050#else /* !CONFIG_PID_NS */
51#include <linux/err.h>
52
53static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
54{
55 return ns;
56}
57
58static inline struct pid_namespace *
59copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
60{
61 if (flags & CLONE_NEWPID)
62 ns = ERR_PTR(-EINVAL);
63 return ns;
64}
65
66static inline void put_pid_ns(struct pid_namespace *ns)
67{
68}
69
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -080070
71static inline void zap_pid_ns_processes(struct pid_namespace *ns)
72{
73 BUG();
74}
Eric W. Biederman57d5f662007-11-14 17:00:13 -080075#endif /* CONFIG_PID_NS */
76
Sukadev Bhattiprolu2894d6502007-10-18 23:39:49 -070077static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
78{
79 return tsk->nsproxy->pid_ns;
80}
81
Sukadev Bhattiprolu88f21d82007-10-18 23:39:50 -070082static inline struct task_struct *task_child_reaper(struct task_struct *tsk)
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080083{
Pavel Emelyanovb461cc02007-10-18 23:40:09 -070084 BUG_ON(tsk != current);
85 return tsk->nsproxy->pid_ns->child_reaper;
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080086}
87
Adrian Bunk3ae4eed2008-07-25 01:48:34 -070088void pidhash_init(void);
89void pidmap_init(void);
90
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -080091#endif /* _LINUX_PID_NS_H */