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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 | |
11 | struct 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 | |
18 | struct bsd_acct_struct; |
19 | |
20 | struct 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 | |
43 | extern struct pid_namespace init_pid_ns; |
44 | |
45 | #define PIDNS_HASH_ADDING (1U << 31) |
46 | |
47 | #ifdef CONFIG_PID_NS |
48 | static 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 | |
55 | extern struct pid_namespace *copy_pid_ns(unsigned long flags, |
56 | struct user_namespace *user_ns, struct pid_namespace *ns); |
57 | extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); |
58 | extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); |
59 | extern void put_pid_ns(struct pid_namespace *ns); |
60 | |
61 | #else /* !CONFIG_PID_NS */ |
62 | #include <linux/err.h> |
63 | |
64 | static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) |
65 | { |
66 | return ns; |
67 | } |
68 | |
69 | static 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 | |
77 | static inline void put_pid_ns(struct pid_namespace *ns) |
78 | { |
79 | } |
80 | |
81 | static inline void zap_pid_ns_processes(struct pid_namespace *ns) |
82 | { |
83 | BUG(); |
84 | } |
85 | |
86 | static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) |
87 | { |
88 | return 0; |
89 | } |
90 | #endif /* CONFIG_PID_NS */ |
91 | |
92 | extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); |
93 | void pidhash_init(void); |
94 | void pidmap_init(void); |
95 | |
96 | #endif /* _LINUX_PID_NS_H */ |
97 |
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