Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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#include <linux/ns_common.h>
12
13struct pidmap {
14 atomic_t nr_free;
15 void *page;
16};
17
18#define BITS_PER_PAGE (PAGE_SIZE * 8)
19#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
20#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
21
22struct fs_pin;
23
24enum { /* definitions for pid_namespace's hide_pid field */
25 HIDEPID_OFF = 0,
26 HIDEPID_NO_ACCESS = 1,
27 HIDEPID_INVISIBLE = 2,
28};
29
30struct pid_namespace {
31 struct kref kref;
32 struct pidmap pidmap[PIDMAP_ENTRIES];
33 struct rcu_head rcu;
34 int last_pid;
35 unsigned int nr_hashed;
36 struct task_struct *child_reaper;
37 struct kmem_cache *pid_cachep;
38 unsigned int level;
39 struct pid_namespace *parent;
40#ifdef CONFIG_PROC_FS
41 struct vfsmount *proc_mnt;
42 struct dentry *proc_self;
43 struct dentry *proc_thread_self;
44#endif
45#ifdef CONFIG_BSD_PROCESS_ACCT
46 struct fs_pin *bacct;
47#endif
48 struct user_namespace *user_ns;
49 struct ucounts *ucounts;
50 struct work_struct proc_work;
51 kgid_t pid_gid;
52 int hide_pid;
53 int reboot; /* group exit code if this pidns was rebooted */
54 struct ns_common ns;
55} __randomize_layout;
56
57extern struct pid_namespace init_pid_ns;
58
59#define PIDNS_HASH_ADDING (1U << 31)
60
61#ifdef CONFIG_PID_NS
62static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
63{
64 if (ns != &init_pid_ns)
65 kref_get(&ns->kref);
66 return ns;
67}
68
69extern struct pid_namespace *copy_pid_ns(unsigned long flags,
70 struct user_namespace *user_ns, struct pid_namespace *ns);
71extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
72extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
73extern void put_pid_ns(struct pid_namespace *ns);
74
75#else /* !CONFIG_PID_NS */
76#include <linux/err.h>
77
78static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
79{
80 return ns;
81}
82
83static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
84 struct user_namespace *user_ns, struct pid_namespace *ns)
85{
86 if (flags & CLONE_NEWPID)
87 ns = ERR_PTR(-EINVAL);
88 return ns;
89}
90
91static inline void put_pid_ns(struct pid_namespace *ns)
92{
93}
94
95static inline void zap_pid_ns_processes(struct pid_namespace *ns)
96{
97 BUG();
98}
99
100static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
101{
102 return 0;
103}
104#endif /* CONFIG_PID_NS */
105
106extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
107void pidhash_init(void);
108void pidmap_init(void);
109
110#endif /* _LINUX_PID_NS_H */