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/workqueue.h>
8#include <linux/threads.h>
9#include <linux/nsproxy.h>
10#include <linux/kref.h>
11
12struct pidmap {
13 atomic_t nr_free;
14 void *page;
15};
16
17#define BITS_PER_PAGE (PAGE_SIZE * 8)
18#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
19#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
20
21struct bsd_acct_struct;
22
23struct pid_namespace {
24 struct kref kref;
25 struct pidmap pidmap[PIDMAP_ENTRIES];
26 int last_pid;
27 unsigned int nr_hashed;
28 struct task_struct *child_reaper;
29 struct kmem_cache *pid_cachep;
30 unsigned int level;
31 struct pid_namespace *parent;
32#ifdef CONFIG_PROC_FS
33 struct vfsmount *proc_mnt;
34 struct dentry *proc_self;
35#endif
36#ifdef CONFIG_BSD_PROCESS_ACCT
37 struct bsd_acct_struct *bacct;
38#endif
39 struct user_namespace *user_ns;
40 struct work_struct proc_work;
41 kgid_t pid_gid;
42 int hide_pid;
43 int reboot; /* group exit code if this pidns was rebooted */
44 unsigned int proc_inum;
45};
46
47extern struct pid_namespace init_pid_ns;
48
49#define PIDNS_HASH_ADDING (1U << 31)
50
51#ifdef CONFIG_PID_NS
52static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
53{
54 if (ns != &init_pid_ns)
55 kref_get(&ns->kref);
56 return ns;
57}
58
59extern struct pid_namespace *copy_pid_ns(unsigned long flags,
60 struct user_namespace *user_ns, struct pid_namespace *ns);
61extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
62extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
63extern void put_pid_ns(struct pid_namespace *ns);
64
65#else /* !CONFIG_PID_NS */
66#include <linux/err.h>
67
68static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
69{
70 return ns;
71}
72
73static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
74 struct user_namespace *user_ns, struct pid_namespace *ns)
75{
76 if (flags & CLONE_NEWPID)
77 ns = ERR_PTR(-EINVAL);
78 return ns;
79}
80
81static inline void put_pid_ns(struct pid_namespace *ns)
82{
83}
84
85static inline void zap_pid_ns_processes(struct pid_namespace *ns)
86{
87 BUG();
88}
89
90static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
91{
92 return 0;
93}
94#endif /* CONFIG_PID_NS */
95
96extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
97void pidhash_init(void);
98void pidmap_init(void);
99
100#endif /* _LINUX_PID_NS_H */