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 pid_namespace {
18 struct kref kref;
19 struct pidmap pidmap[PIDMAP_ENTRIES];
20 int last_pid;
21 struct task_struct *child_reaper;
22 struct kmem_cache *pid_cachep;
23 unsigned int level;
24 struct pid_namespace *parent;
25#ifdef CONFIG_PROC_FS
26 struct vfsmount *proc_mnt;
27#endif
28};
29
30extern struct pid_namespace init_pid_ns;
31
32#ifdef CONFIG_PID_NS
33static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
34{
35 if (ns != &init_pid_ns)
36 kref_get(&ns->kref);
37 return ns;
38}
39
40extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
41extern void free_pid_ns(struct kref *kref);
42extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
43
44static inline void put_pid_ns(struct pid_namespace *ns)
45{
46 if (ns != &init_pid_ns)
47 kref_put(&ns->kref, free_pid_ns);
48}
49
50#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
70
71static inline void zap_pid_ns_processes(struct pid_namespace *ns)
72{
73 BUG();
74}
75#endif /* CONFIG_PID_NS */
76
77static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
78{
79 return tsk->nsproxy->pid_ns;
80}
81
82static inline struct task_struct *task_child_reaper(struct task_struct *tsk)
83{
84 BUG_ON(tsk != current);
85 return tsk->nsproxy->pid_ns->child_reaper;
86}
87
88#endif /* _LINUX_PID_NS_H */