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 struct rcu_head rcu;
27 int last_pid;
28 unsigned int nr_hashed;
29 struct task_struct *child_reaper;
30 struct kmem_cache *pid_cachep;
31 unsigned int level;
32 struct pid_namespace *parent;
33#ifdef CONFIG_PROC_FS
34 struct vfsmount *proc_mnt;
35 struct dentry *proc_self;
36 struct dentry *proc_thread_self;
37#endif
38#ifdef CONFIG_BSD_PROCESS_ACCT
39 struct bsd_acct_struct *bacct;
40#endif
41 struct user_namespace *user_ns;
42 struct work_struct proc_work;
43 kgid_t pid_gid;
44 int hide_pid;
45 int reboot; /* group exit code if this pidns was rebooted */
46 unsigned int proc_inum;
47};
48
49extern struct pid_namespace init_pid_ns;
50
51#define PIDNS_HASH_ADDING (1U << 31)
52
53#ifdef CONFIG_PID_NS
54static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
55{
56 if (ns != &init_pid_ns)
57 kref_get(&ns->kref);
58 return ns;
59}
60
61extern struct pid_namespace *copy_pid_ns(unsigned long flags,
62 struct user_namespace *user_ns, struct pid_namespace *ns);
63extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
64extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
65extern void put_pid_ns(struct pid_namespace *ns);
66
67#else /* !CONFIG_PID_NS */
68#include <linux/err.h>
69
70static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
71{
72 return ns;
73}
74
75static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
76 struct user_namespace *user_ns, struct pid_namespace *ns)
77{
78 if (flags & CLONE_NEWPID)
79 ns = ERR_PTR(-EINVAL);
80 return ns;
81}
82
83static inline void put_pid_ns(struct pid_namespace *ns)
84{
85}
86
87static inline void zap_pid_ns_processes(struct pid_namespace *ns)
88{
89 BUG();
90}
91
92static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
93{
94 return 0;
95}
96#endif /* CONFIG_PID_NS */
97
98extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
99void pidhash_init(void);
100void pidmap_init(void);
101
102#endif /* _LINUX_PID_NS_H */