Linux Kernel  3.7.1
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user_namespace.h
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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 UID_GID_MAP_MAX_EXTENTS 5
10 
11 struct uid_gid_map { /* 64 bytes -- 1 cache line */
13  struct uid_gid_extent {
18 };
19 
24  struct kref kref;
28 };
29 
30 extern struct user_namespace init_user_ns;
31 
32 #ifdef CONFIG_USER_NS
33 
34 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
35 {
36  if (ns)
37  kref_get(&ns->kref);
38  return ns;
39 }
40 
41 extern int create_user_ns(struct cred *new);
42 extern void free_user_ns(struct kref *kref);
43 
44 static inline void put_user_ns(struct user_namespace *ns)
45 {
46  if (ns)
47  kref_put(&ns->kref, free_user_ns);
48 }
49 
50 struct seq_operations;
54 extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
55 extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
56 extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
57 #else
58 
59 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
60 {
61  return &init_user_ns;
62 }
63 
64 static inline int create_user_ns(struct cred *new)
65 {
66  return -EINVAL;
67 }
68 
69 static inline void put_user_ns(struct user_namespace *ns)
70 {
71 }
72 
73 #endif
74 
75 #endif /* _LINUX_USER_H */