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1	/ SPDX-License-Identifier: GPL-2.0 /
2	#ifndef _LINUX_UTS_NAMESPACE_H
3	#define _LINUX_UTS_NAMESPACE_H
4
5	#include <linux/ns_common.h>
6	#include <uapi/linux/utsname.h>
7
8	struct user_namespace;
9	extern struct user_namespace init_user_ns;
10
11	struct uts_namespace {
12	struct new_utsname name;
13	struct user_namespace *user_ns;
14	struct ucounts *ucounts;
15	struct ns_common ns;
16	} __randomize_layout;
17
18	extern struct uts_namespace init_uts_ns;
19
20	#ifdef CONFIG_UTS_NS
21	static inline struct uts_namespace to_uts_ns(struct* ns_common *ns)
22	{
23	return container_of(ns, struct uts_namespace, ns);
24	}
25
26	static inline void get_uts_ns(struct uts_namespace *ns)
27	{
28	ns_ref_inc(ns);
29	}
30
31	extern struct uts_namespace *copy_utsname(u64 flags,
32	struct user_namespace user_ns, struct* uts_namespace *old_ns);
33	extern void free_uts_ns(struct uts_namespace *ns);
34
35	static inline void put_uts_ns(struct uts_namespace *ns)
36	{
37	if (ns_ref_put(ns))
38	free_uts_ns(ns);
39	}
40
41	void uts_ns_init(void);
42	#else
43	static inline void get_uts_ns(struct uts_namespace *ns)
44	{
45	}
46
47	static inline void put_uts_ns(struct uts_namespace *ns)
48	{
49	}
50
51	static inline struct uts_namespace *copy_utsname(u64 flags,
52	struct user_namespace user_ns, struct* uts_namespace *old_ns)
53	{
54	if (flags & CLONE_NEWUTS)
55	return ERR_PTR(-EINVAL);
56
57	return old_ns;
58	}
59
60	static inline void uts_ns_init(void)
61	{
62	}
63	#endif
64
65	#endif /* _LINUX_UTS_NAMESPACE_H */
66

uts_namespace.h