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