Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_UTSNAME_H
3#define _LINUX_UTSNAME_H
4
5
6#include <linux/sched.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 new_utsname name;
25 struct user_namespace *user_ns;
26 struct ucounts *ucounts;
27 struct ns_common ns;
28} __randomize_layout;
29extern struct uts_namespace init_uts_ns;
30
31#ifdef CONFIG_UTS_NS
32static inline void get_uts_ns(struct uts_namespace *ns)
33{
34 refcount_inc(&ns->ns.count);
35}
36
37extern struct uts_namespace *copy_utsname(unsigned long flags,
38 struct user_namespace *user_ns, struct uts_namespace *old_ns);
39extern void free_uts_ns(struct uts_namespace *ns);
40
41static inline void put_uts_ns(struct uts_namespace *ns)
42{
43 if (refcount_dec_and_test(&ns->ns.count))
44 free_uts_ns(ns);
45}
46
47void uts_ns_init(void);
48#else
49static inline void get_uts_ns(struct uts_namespace *ns)
50{
51}
52
53static inline void put_uts_ns(struct uts_namespace *ns)
54{
55}
56
57static inline struct uts_namespace *copy_utsname(unsigned long flags,
58 struct user_namespace *user_ns, struct uts_namespace *old_ns)
59{
60 if (flags & CLONE_NEWUTS)
61 return ERR_PTR(-EINVAL);
62
63 return old_ns;
64}
65
66static inline void uts_ns_init(void)
67{
68}
69#endif
70
71#ifdef CONFIG_PROC_SYSCTL
72extern void uts_proc_notify(enum uts_proc proc);
73#else
74static inline void uts_proc_notify(enum uts_proc proc)
75{
76}
77#endif
78
79static inline struct new_utsname *utsname(void)
80{
81 return ¤t->nsproxy->uts_ns->name;
82}
83
84static inline struct new_utsname *init_utsname(void)
85{
86 return &init_uts_ns.name;
87}
88
89extern struct rw_semaphore uts_sem;
90
91#endif /* _LINUX_UTSNAME_H */