tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
7#include <linux/err.h>
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;
14 struct hlist_head uidhash_table[UIDHASH_SZ];
15 struct user_struct *creator;
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
29extern int create_user_ns(struct cred *new);
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
45static inline int create_user_ns(struct cred *new)
46{
47 return -EINVAL;
48}
49
50static inline void put_user_ns(struct user_namespace *ns)
51{
52}
53
54#endif
55
56#endif /* _LINUX_USER_H */