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/ns_common.h> 9 #include <linux/err.h> 10 #include <uapi/linux/utsname.h> 11 12 enum uts_proc { 13 UTS_PROC_OSTYPE, 14 UTS_PROC_OSRELEASE, 15 UTS_PROC_VERSION, 16 UTS_PROC_HOSTNAME, 17 UTS_PROC_DOMAINNAME, 18 }; 19 20 struct user_namespace; 21 extern struct user_namespace init_user_ns; 22 23 struct uts_namespace { 24 struct kref kref; 25 struct new_utsname name; 26 struct user_namespace *user_ns; 27 struct ns_common ns; 28 }; 29 extern struct uts_namespace init_uts_ns; 30 31 #ifdef CONFIG_UTS_NS 32 static inline void get_uts_ns(struct uts_namespace *ns) 33 { 34 kref_get(&ns->kref); 35 } 36 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 kref *kref); 40 41 static inline void put_uts_ns(struct uts_namespace *ns) 42 { 43 kref_put(&ns->kref, free_uts_ns); 44 } 45 #else 46 static inline void get_uts_ns(struct uts_namespace *ns) 47 { 48 } 49 50 static inline void put_uts_ns(struct uts_namespace *ns) 51 { 52 } 53 54 static inline struct uts_namespace *copy_utsname(unsigned long flags, 55 struct user_namespace *user_ns, struct uts_namespace *old_ns) 56 { 57 if (flags & CLONE_NEWUTS) 58 return ERR_PTR(-EINVAL); 59 60 return old_ns; 61 } 62 #endif 63 64 #ifdef CONFIG_PROC_SYSCTL 65 extern void uts_proc_notify(enum uts_proc proc); 66 #else 67 static inline void uts_proc_notify(enum uts_proc proc) 68 { 69 } 70 #endif 71 72 static inline struct new_utsname *utsname(void) 73 { 74 return ¤t->nsproxy->uts_ns->name; 75 } 76 77 static inline struct new_utsname *init_utsname(void) 78 { 79 return &init_uts_ns.name; 80 } 81 82 extern struct rw_semaphore uts_sem; 83 84 #endif /* _LINUX_UTSNAME_H */ 85