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