/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef _LINUX_UTSNAME_H
  #define _LINUX_UTSNAME_H

  
  #include <linux/sched.h>
  #include <linux/kref.h>
  #include <linux/nsproxy.h>

  #include <linux/ns_common.h>

  #include <linux/err.h>

  #include <uapi/linux/utsname.h>

  enum uts_proc {
  	UTS_PROC_OSTYPE,
  	UTS_PROC_OSRELEASE,
  	UTS_PROC_VERSION,
  	UTS_PROC_HOSTNAME,
  	UTS_PROC_DOMAINNAME,
  };

  struct user_namespace;
  extern struct user_namespace init_user_ns;

  struct uts_namespace {
  	struct kref kref;
  	struct new_utsname name;

  	struct user_namespace *user_ns;

  	struct ucounts *ucounts;

  	struct ns_common ns;

  } __randomize_layout;

  extern struct uts_namespace init_uts_ns;

  #ifdef CONFIG_UTS_NS

  static inline void get_uts_ns(struct uts_namespace *ns)
  {
  	kref_get(&ns->kref);
  }

  extern struct uts_namespace *copy_utsname(unsigned long flags,

  	struct user_namespace *user_ns, struct uts_namespace *old_ns);

  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 void get_uts_ns(struct uts_namespace *ns)
  {
  }
  
  static inline void put_uts_ns(struct uts_namespace *ns)
  {
  }
  
  static inline struct uts_namespace *copy_utsname(unsigned long flags,

  	struct user_namespace *user_ns, struct uts_namespace *old_ns)

  {
  	if (flags & CLONE_NEWUTS)
  		return ERR_PTR(-EINVAL);

  	return old_ns;

  }
  #endif

  #ifdef CONFIG_PROC_SYSCTL
  extern void uts_proc_notify(enum uts_proc proc);
  #else
  static inline void uts_proc_notify(enum uts_proc proc)
  {
  }
  #endif

  static inline struct new_utsname *utsname(void)
  {

  	return &current->nsproxy->uts_ns->name;

  }
  
  static inline struct new_utsname *init_utsname(void)
  {

  	return &init_uts_ns.name;

  }

  extern struct rw_semaphore uts_sem;

  #endif /* _LINUX_UTSNAME_H */