blob: 1101b0ce878f67973d5037f7b651cabf1fb8d28e (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
#ifndef _LINUX_USER_NAMESPACE_H
#define _LINUX_USER_NAMESPACE_H
#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <linux/sched.h>
#include <linux/err.h>
#define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8)
#define UIDHASH_SZ (1 << UIDHASH_BITS)
struct user_namespace {
struct kref kref;
struct list_head uidhash_table[UIDHASH_SZ];
struct user_struct *root_user;
};
extern struct user_namespace init_user_ns;
#ifdef CONFIG_USER_NS
static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
if (ns)
kref_get(&ns->kref);
return ns;
}
extern struct user_namespace *copy_user_ns(int flags,
struct user_namespace *old_ns);
extern void free_user_ns(struct kref *kref);
static inline void put_user_ns(struct user_namespace *ns)
{
if (ns)
kref_put(&ns->kref, free_user_ns);
}
#else
static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
return &init_user_ns;
}
static inline struct user_namespace *copy_user_ns(int flags,
struct user_namespace *old_ns)
{
if (flags & CLONE_NEWUSER)
return ERR_PTR(-EINVAL);
return old_ns;
}
static inline void put_user_ns(struct user_namespace *ns)
{
}
#endif
#endif /* _LINUX_USER_H */
|
