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