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#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
24struct pid_namespace {
25 struct kref kref;
26 struct pidmap pidmap[PIDMAP_ENTRIES];
27 struct rcu_head rcu;
28 int last_pid;
29 unsigned int nr_hashed;
30 struct task_struct *child_reaper;
31 struct kmem_cache *pid_cachep;
32 unsigned int level;
33 struct pid_namespace *parent;
34#ifdef CONFIG_PROC_FS
35 struct vfsmount *proc_mnt;
36 struct dentry *proc_self;
37 struct dentry *proc_thread_self;
38#endif
39#ifdef CONFIG_BSD_PROCESS_ACCT
40 struct fs_pin *bacct;
41#endif
42 struct user_namespace *user_ns;
43 struct ucounts *ucounts;
44 struct work_struct proc_work;
45 kgid_t pid_gid;
46 int hide_pid;
47 int reboot; /* group exit code if this pidns was rebooted */
48 struct ns_common ns;
49};
50
51extern struct pid_namespace init_pid_ns;
52
53#define PIDNS_HASH_ADDING (1U << 31)
54
55#ifdef CONFIG_PID_NS
56static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
57{
58 if (ns != &init_pid_ns)
59 kref_get(&ns->kref);
60 return ns;
61}
62
63extern struct pid_namespace *copy_pid_ns(unsigned long flags,
64 struct user_namespace *user_ns, struct pid_namespace *ns);
65extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
66extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
67extern void put_pid_ns(struct pid_namespace *ns);
68
69#else /* !CONFIG_PID_NS */
70#include <linux/err.h>
71
72static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
73{
74 return ns;
75}
76
77static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
78 struct user_namespace *user_ns, struct pid_namespace *ns)
79{
80 if (flags & CLONE_NEWPID)
81 ns = ERR_PTR(-EINVAL);
82 return ns;
83}
84
85static inline void put_pid_ns(struct pid_namespace *ns)
86{
87}
88
89static inline void zap_pid_ns_processes(struct pid_namespace *ns)
90{
91 BUG();
92}
93
94static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
95{
96 return 0;
97}
98#endif /* CONFIG_PID_NS */
99
100extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
101void pidhash_init(void);
102void pidmap_init(void);
103
104#endif /* _LINUX_PID_NS_H */