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/mm.h>
6#include <linux/threads.h>
7#include <linux/nsproxy.h>
8#include <linux/kref.h>
9
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
17struct bsd_acct_struct;
18
19struct 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
35extern struct pid_namespace init_pid_ns;
36
37#ifdef CONFIG_PID_NS
38static 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
45extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
46extern void free_pid_ns(struct kref *kref);
47extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
48
49static 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
58static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
59{
60 return ns;
61}
62
63static inline struct pid_namespace *
64copy_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
71static inline void put_pid_ns(struct pid_namespace *ns)
72{
73}
74
75
76static inline void zap_pid_ns_processes(struct pid_namespace *ns)
77{
78 BUG();
79}
80#endif /* CONFIG_PID_NS */
81
82extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
83void pidhash_init(void);
84void pidmap_init(void);
85
86#endif /* _LINUX_PID_NS_H */