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 }; 27 extern struct uts_namespace init_uts_ns; 28 29 #ifdef CONFIG_UTS_NS 30 static inline void get_uts_ns(struct uts_namespace *ns) 31 { 32 kref_get(&ns->kref); 33 } 34 35 extern struct uts_namespace *copy_utsname(unsigned long flags, 36 struct task_struct *tsk); 37 extern void free_uts_ns(struct kref *kref); 38 39 static inline void put_uts_ns(struct uts_namespace *ns) 40 { 41 kref_put(&ns->kref, free_uts_ns); 42 } 43 #else 44 static inline void get_uts_ns(struct uts_namespace *ns) 45 { 46 } 47 48 static inline void put_uts_ns(struct uts_namespace *ns) 49 { 50 } 51 52 static inline struct uts_namespace *copy_utsname(unsigned long flags, 53 struct task_struct *tsk) 54 { 55 if (flags & CLONE_NEWUTS) 56 return ERR_PTR(-EINVAL); 57 58 return tsk->nsproxy->uts_ns; 59 } 60 #endif 61 62 #ifdef CONFIG_PROC_SYSCTL 63 extern void uts_proc_notify(enum uts_proc proc); 64 #else 65 static inline void uts_proc_notify(enum uts_proc proc) 66 { 67 } 68 #endif 69 70 static inline struct new_utsname *utsname(void) 71 { 72 return ¤t->nsproxy->uts_ns->name; 73 } 74 75 static inline struct new_utsname *init_utsname(void) 76 { 77 return &init_uts_ns.name; 78 } 79 80 extern struct rw_semaphore uts_sem; 81 82 #endif /* _LINUX_UTSNAME_H */ 83