projects/linux·blob v4.12 · refs

85 lines · 1.7 KiB

1#ifndef _LINUX_UTSNAME_H
2#define _LINUX_UTSNAME_H
3
4
5#include <linux/sched.h>
6#include <linux/kref.h>
7#include <linux/nsproxy.h>
8#include <linux/ns_common.h>
9#include <linux/err.h>
10#include <uapi/linux/utsname.h>
11
12enum uts_proc {
13 UTS_PROC_OSTYPE,
14 UTS_PROC_OSRELEASE,
15 UTS_PROC_VERSION,
16 UTS_PROC_HOSTNAME,
17 UTS_PROC_DOMAINNAME,
18};
19
20struct user_namespace;
21extern struct user_namespace init_user_ns;
22
23struct uts_namespace {
24 struct kref kref;
25 struct new_utsname name;
26 struct user_namespace *user_ns;
27 struct ucounts *ucounts;
28 struct ns_common ns;
29};
30extern struct uts_namespace init_uts_ns;
31
32#ifdef CONFIG_UTS_NS
33static inline void get_uts_ns(struct uts_namespace *ns)
34{
35 kref_get(&ns->kref);
36}
37
38extern struct uts_namespace *copy_utsname(unsigned long flags,
39 struct user_namespace *user_ns, struct uts_namespace *old_ns);
40extern void free_uts_ns(struct kref *kref);
41
42static inline void put_uts_ns(struct uts_namespace *ns)
43{
44 kref_put(&ns->kref, free_uts_ns);
45}
46#else
47static inline void get_uts_ns(struct uts_namespace *ns)
48{
49}
50
51static inline void put_uts_ns(struct uts_namespace *ns)
52{
53}
54
55static inline struct uts_namespace *copy_utsname(unsigned long flags,
56 struct user_namespace *user_ns, struct uts_namespace *old_ns)
57{
58 if (flags & CLONE_NEWUTS)
59 return ERR_PTR(-EINVAL);
60
61 return old_ns;
62}
63#endif
64
65#ifdef CONFIG_PROC_SYSCTL
66extern void uts_proc_notify(enum uts_proc proc);
67#else
68static inline void uts_proc_notify(enum uts_proc proc)
69{
70}
71#endif
72
73static inline struct new_utsname *utsname(void)
74{
75 return &current->nsproxy->uts_ns->name;
76}
77
78static inline struct new_utsname *init_utsname(void)
79{
80 return &init_uts_ns.name;
81}
82
83extern struct rw_semaphore uts_sem;
84
85#endif /* _LINUX_UTSNAME_H */