char domainname[65];
};
-extern struct new_utsname system_utsname;
+#ifdef __KERNEL__
-extern struct rw_semaphore uts_sem;
+#include <linux/sched.h>
+#include <linux/kref.h>
+#include <linux/nsproxy.h>
+#include <asm/atomic.h>
+
+struct uts_namespace {
+ struct kref kref;
+ struct new_utsname name;
+};
+extern struct uts_namespace init_uts_ns;
+
+static inline void get_uts_ns(struct uts_namespace *ns)
+{
+ kref_get(&ns->kref);
+}
+
+#ifdef CONFIG_UTS_NS
+extern int unshare_utsname(unsigned long unshare_flags,
+ struct uts_namespace **new_uts);
+extern int copy_utsname(int flags, struct task_struct *tsk);
+extern void free_uts_ns(struct kref *kref);
+
+static inline void put_uts_ns(struct uts_namespace *ns)
+{
+ kref_put(&ns->kref, free_uts_ns);
+}
+#else
+static inline int unshare_utsname(unsigned long unshare_flags,
+ struct uts_namespace **new_uts)
+{
+ if (unshare_flags & CLONE_NEWUTS)
+ return -EINVAL;
+
+ return 0;
+}
+
+static inline int copy_utsname(int flags, struct task_struct *tsk)
+{
+ return 0;
+}
+static inline void put_uts_ns(struct uts_namespace *ns)
+{
+}
#endif
+
+static inline struct new_utsname *utsname(void)
+{
+ return ¤t->nsproxy->uts_ns->name;
+}
+
+static inline struct new_utsname *init_utsname(void)
+{
+ return &init_uts_ns.name;
+}
+
+extern struct rw_semaphore uts_sem;
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_UTSNAME_H */