| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _LINUX_UTS_NAMESPACE_H |
| 3 | #define _LINUX_UTS_NAMESPACE_H |
| 4 | |
| 5 | #include <linux/ns_common.h> |
| 6 | #include <uapi/linux/utsname.h> |
| 7 | |
| 8 | struct user_namespace; |
| 9 | extern struct user_namespace init_user_ns; |
| 10 | |
| 11 | struct uts_namespace { |
| 12 | struct new_utsname name; |
| 13 | struct user_namespace *user_ns; |
| 14 | struct ucounts *ucounts; |
| 15 | struct ns_common ns; |
| 16 | } __randomize_layout; |
| 17 | |
| 18 | extern struct uts_namespace init_uts_ns; |
| 19 | |
| 20 | #ifdef CONFIG_UTS_NS |
| 21 | static inline struct uts_namespace *to_uts_ns(struct ns_common *ns) |
| 22 | { |
| 23 | return container_of(ns, struct uts_namespace, ns); |
| 24 | } |
| 25 | |
| 26 | static inline void get_uts_ns(struct uts_namespace *ns) |
| 27 | { |
| 28 | ns_ref_inc(ns); |
| 29 | } |
| 30 | |
| 31 | extern struct uts_namespace *copy_utsname(u64 flags, |
| 32 | struct user_namespace *user_ns, struct uts_namespace *old_ns); |
| 33 | extern void free_uts_ns(struct uts_namespace *ns); |
| 34 | |
| 35 | static inline void put_uts_ns(struct uts_namespace *ns) |
| 36 | { |
| 37 | if (ns_ref_put(ns)) |
| 38 | free_uts_ns(ns); |
| 39 | } |
| 40 | |
| 41 | void uts_ns_init(void); |
| 42 | #else |
| 43 | static inline void get_uts_ns(struct uts_namespace *ns) |
| 44 | { |
| 45 | } |
| 46 | |
| 47 | static inline void put_uts_ns(struct uts_namespace *ns) |
| 48 | { |
| 49 | } |
| 50 | |
| 51 | static inline struct uts_namespace *copy_utsname(u64 flags, |
| 52 | struct user_namespace *user_ns, struct uts_namespace *old_ns) |
| 53 | { |
| 54 | if (flags & CLONE_NEWUTS) |
| 55 | return ERR_PTR(-EINVAL); |
| 56 | |
| 57 | return old_ns; |
| 58 | } |
| 59 | |
| 60 | static inline void uts_ns_init(void) |
| 61 | { |
| 62 | } |
| 63 | #endif |
| 64 | |
| 65 | #endif /* _LINUX_UTS_NAMESPACE_H */ |
| 66 |