1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_UTSNAME_H
3 #define _LINUX_UTSNAME_H
6 #include <linux/sched.h>
7 #include <linux/nsproxy.h>
8 #include <linux/ns_common.h>
10 #include <uapi/linux/utsname.h>
20 struct user_namespace
;
21 extern struct user_namespace init_user_ns
;
23 struct uts_namespace
{
24 struct new_utsname name
;
25 struct user_namespace
*user_ns
;
26 struct ucounts
*ucounts
;
29 extern struct uts_namespace init_uts_ns
;
32 static inline void get_uts_ns(struct uts_namespace
*ns
)
34 refcount_inc(&ns
->ns
.count
);
37 extern struct uts_namespace
*copy_utsname(unsigned long flags
,
38 struct user_namespace
*user_ns
, struct uts_namespace
*old_ns
);
39 extern void free_uts_ns(struct uts_namespace
*ns
);
41 static inline void put_uts_ns(struct uts_namespace
*ns
)
43 if (refcount_dec_and_test(&ns
->ns
.count
))
47 void uts_ns_init(void);
49 static inline void get_uts_ns(struct uts_namespace
*ns
)
53 static inline void put_uts_ns(struct uts_namespace
*ns
)
57 static inline struct uts_namespace
*copy_utsname(unsigned long flags
,
58 struct user_namespace
*user_ns
, struct uts_namespace
*old_ns
)
60 if (flags
& CLONE_NEWUTS
)
61 return ERR_PTR(-EINVAL
);
66 static inline void uts_ns_init(void)
71 #ifdef CONFIG_PROC_SYSCTL
72 extern void uts_proc_notify(enum uts_proc proc
);
74 static inline void uts_proc_notify(enum uts_proc proc
)
79 static inline struct new_utsname
*utsname(void)
81 return ¤t
->nsproxy
->uts_ns
->name
;
84 static inline struct new_utsname
*init_utsname(void)
86 return &init_uts_ns
.name
;
89 extern struct rw_semaphore uts_sem
;
91 #endif /* _LINUX_UTSNAME_H */