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/* 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); } void uts_ns_init(void); #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; } static inline void uts_ns_init(void) { } #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 ¤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 /* _LINUX_UTSNAME_H */