1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_CGROUP_NAMESPACE_H
3 #define _LINUX_CGROUP_NAMESPACE_H
4
5 #include <linux/ns_common.h>
6
7 struct cgroup_namespace {
8 struct ns_common ns;
9 struct user_namespace *user_ns;
10 struct ucounts *ucounts;
11 struct css_set *root_cset;
12 };
13
14 extern struct cgroup_namespace init_cgroup_ns;
15
16 #ifdef CONFIG_CGROUPS
17
to_cg_ns(struct ns_common * ns)18 static inline struct cgroup_namespace *to_cg_ns(struct ns_common *ns)
19 {
20 return container_of(ns, struct cgroup_namespace, ns);
21 }
22
23 void free_cgroup_ns(struct cgroup_namespace *ns);
24
25 struct cgroup_namespace *copy_cgroup_ns(u64 flags,
26 struct user_namespace *user_ns,
27 struct cgroup_namespace *old_ns);
28
29 int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
30 struct cgroup_namespace *ns);
31
get_cgroup_ns(struct cgroup_namespace * ns)32 static inline void get_cgroup_ns(struct cgroup_namespace *ns)
33 {
34 ns_ref_inc(ns);
35 }
36
put_cgroup_ns(struct cgroup_namespace * ns)37 static inline void put_cgroup_ns(struct cgroup_namespace *ns)
38 {
39 if (ns_ref_put(ns))
40 free_cgroup_ns(ns);
41 }
42
43 #else /* !CONFIG_CGROUPS */
44
free_cgroup_ns(struct cgroup_namespace * ns)45 static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
46 static inline struct cgroup_namespace *
copy_cgroup_ns(u64 flags,struct user_namespace * user_ns,struct cgroup_namespace * old_ns)47 copy_cgroup_ns(u64 flags, struct user_namespace *user_ns,
48 struct cgroup_namespace *old_ns)
49 {
50 return old_ns;
51 }
52
get_cgroup_ns(struct cgroup_namespace * ns)53 static inline void get_cgroup_ns(struct cgroup_namespace *ns) { }
put_cgroup_ns(struct cgroup_namespace * ns)54 static inline void put_cgroup_ns(struct cgroup_namespace *ns) { }
55
56 #endif /* !CONFIG_CGROUPS */
57
58 #endif /* _LINUX_CGROUP_NAMESPACE_H */
59