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 gid_t pid_gid;
34 int hide_pid;
35};
36
37extern struct pid_namespace init_pid_ns;
38
39#ifdef CONFIG_PID_NS
40static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
41{
42 if (ns != &init_pid_ns)
43 kref_get(&ns->kref);
44 return ns;
45}
46
47extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
48extern void free_pid_ns(struct kref *kref);
49extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
50
51static inline void put_pid_ns(struct pid_namespace *ns)
52{
53 if (ns != &init_pid_ns)
54 kref_put(&ns->kref, free_pid_ns);
55}
56
57#else /* !CONFIG_PID_NS */
58#include <linux/err.h>
59
60static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
61{
62 return ns;
63}
64
65static inline struct pid_namespace *
66copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
67{
68 if (flags & CLONE_NEWPID)
69 ns = ERR_PTR(-EINVAL);
70 return ns;
71}
72
73static inline void put_pid_ns(struct pid_namespace *ns)
74{
75}
76
77
78static inline void zap_pid_ns_processes(struct pid_namespace *ns)
79{
80 BUG();
81}
82#endif /* CONFIG_PID_NS */
83
84extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
85void pidhash_init(void);
86void pidmap_init(void);
87
88#endif /* _LINUX_PID_NS_H */