Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
11struct pidmap {
12 atomic_t nr_free;
13 void *page;
14};
15
16#define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
17
18struct bsd_acct_struct;
19
20struct pid_namespace {
21 struct kref kref;
22 struct pidmap pidmap[PIDMAP_ENTRIES];
23 int last_pid;
24 struct task_struct *child_reaper;
25 struct kmem_cache *pid_cachep;
26 unsigned int level;
27 struct pid_namespace *parent;
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
34 kgid_t pid_gid;
35 int hide_pid;
36 int reboot; /* group exit code if this pidns was rebooted */
37};
38
39extern struct pid_namespace init_pid_ns;
40
41#ifdef CONFIG_PID_NS
42static 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
49extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
50extern void free_pid_ns(struct kref *kref);
51extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
52extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
53
54static inline void put_pid_ns(struct pid_namespace *ns)
55{
56 if (ns != &init_pid_ns)
57 kref_put(&ns->kref, free_pid_ns);
58}
59
60#else /* !CONFIG_PID_NS */
61#include <linux/err.h>
62
63static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
64{
65 return ns;
66}
67
68static inline struct pid_namespace *
69copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
70{
71 if (flags & CLONE_NEWPID)
72 ns = ERR_PTR(-EINVAL);
73 return ns;
74}
75
76static inline void put_pid_ns(struct pid_namespace *ns)
77{
78}
79
80static inline void zap_pid_ns_processes(struct pid_namespace *ns)
81{
82 BUG();
83}
84
85static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
86{
87 return 0;
88}
89#endif /* CONFIG_PID_NS */
90
91extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
92void pidhash_init(void);
93void pidmap_init(void);
94
95#endif /* _LINUX_PID_NS_H */