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gerrit-public.fairphone.software / kernel / msm-4.9 / 71b3346d182355f19509fadb8fe45114a35cc499 / . / include / linux / user_namespace.h
blob: 315bcd375224869a0e54cbaab27274588452d4d3 [file] [log] [blame]
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]1#ifndef _LINUX_USER_NAMESPACE_H
2#define _LINUX_USER_NAMESPACE_H
3
4#include <linux/kref.h>
5#include <linux/nsproxy.h>
6#include <linux/sched.h>
Serge E. Hallyn77ec7392007-07-15 23:41:01 -0700[diff] [blame]7#include <linux/err.h>
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]8
9#define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8)
10#define UIDHASH_SZ (1 << UIDHASH_BITS)
11
12struct user_namespace {
13 struct kref kref;
Pavel Emelyanov735de222007-09-18 22:46:44 -0700[diff] [blame]14 struct hlist_head uidhash_table[UIDHASH_SZ];
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]15 struct user_struct *creator;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]16};
17
18extern struct user_namespace init_user_ns;
19
20#ifdef CONFIG_USER_NS
21
22static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
23{
24 if (ns)
25 kref_get(&ns->kref);
26 return ns;
27}
28
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]29extern int create_user_ns(struct cred *new);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]30extern void free_user_ns(struct kref *kref);
31
32static inline void put_user_ns(struct user_namespace *ns)
33{
34 if (ns)
35 kref_put(&ns->kref, free_user_ns);
36}
37
38#else
39
40static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
41{
42 return &init_user_ns;
43}
44
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]45static inline int create_user_ns(struct cred *new)
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]46{
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]47 return -EINVAL;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]48}
49
50static inline void put_user_ns(struct user_namespace *ns)
51{
52}
53
54#endif
55
56#endif /* _LINUX_USER_H */