Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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 struct work_struct destroyer;
17};
18
19extern struct user_namespace init_user_ns;
20
21#ifdef CONFIG_USER_NS
22
23static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
24{
25 if (ns)
26 kref_get(&ns->kref);
27 return ns;
28}
29
30extern int create_user_ns(struct cred *new);
31extern void free_user_ns(struct kref *kref);
32
33static inline void put_user_ns(struct user_namespace *ns)
34{
35 if (ns)
36 kref_put(&ns->kref, free_user_ns);
37}
38
39#else
40
41static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
42{
43 return &init_user_ns;
44}
45
46static inline int create_user_ns(struct cred *new)
47{
48 return -EINVAL;
49}
50
51static inline void put_user_ns(struct user_namespace *ns)
52{
53}
54
55#endif
56
57#endif /* _LINUX_USER_H */