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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 |
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 | |
40 | static inline void put_uts_ns(struct uts_namespace *ns) |
41 | { |
42 | kref_put(&ns->kref, free_uts_ns); |
43 | } |
44 | #else |
45 | static inline void get_uts_ns(struct uts_namespace *ns) |
46 | { |
47 | } |
48 | |
49 | static inline void put_uts_ns(struct uts_namespace *ns) |
50 | { |
51 | } |
52 | |
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 |
66 | static inline void uts_proc_notify(enum uts_proc proc) |
67 | { |
68 | } |
69 | #endif |
70 | |
71 | static inline struct new_utsname *utsname(void) |
72 | { |
73 | return ¤t->nsproxy->uts_ns->name; |
74 | } |
75 | |
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 |
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