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