1 #ifndef _LINUX_USER_NAMESPACE_H
2 #define _LINUX_USER_NAMESPACE_H
4 #include <linux/kref.h>
5 #include <linux/nsproxy.h>
6 #include <linux/sched.h>
9 #define UID_GID_MAP_MAX_EXTENTS 5
11 struct uid_gid_map
{ /* 64 bytes -- 1 cache line */
13 struct uid_gid_extent
{
17 } extent
[UID_GID_MAP_MAX_EXTENTS
];
20 struct user_namespace
{
21 struct uid_gid_map uid_map
;
22 struct uid_gid_map gid_map
;
23 struct uid_gid_map projid_map
;
25 struct user_namespace
*parent
;
29 unsigned int proc_inum
;
34 extern struct user_namespace init_user_ns
;
38 static inline struct user_namespace
*get_user_ns(struct user_namespace
*ns
)
41 atomic_inc(&ns
->count
);
45 extern int create_user_ns(struct cred
*new);
46 extern int unshare_userns(unsigned long unshare_flags
, struct cred
**new_cred
);
47 extern void free_user_ns(struct user_namespace
*ns
);
49 static inline void put_user_ns(struct user_namespace
*ns
)
51 if (ns
&& atomic_dec_and_test(&ns
->count
))
55 struct seq_operations
;
56 extern struct seq_operations proc_uid_seq_operations
;
57 extern struct seq_operations proc_gid_seq_operations
;
58 extern struct seq_operations proc_projid_seq_operations
;
59 extern ssize_t
proc_uid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
60 extern ssize_t
proc_gid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
61 extern ssize_t
proc_projid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
64 static inline struct user_namespace
*get_user_ns(struct user_namespace
*ns
)
69 static inline int create_user_ns(struct cred
*new)
74 static inline int unshare_userns(unsigned long unshare_flags
,
75 struct cred
**new_cred
)
77 if (unshare_flags
& CLONE_NEWUSER
)
82 static inline void put_user_ns(struct user_namespace
*ns
)
88 void update_mnt_policy(struct user_namespace
*userns
);
90 #endif /* _LINUX_USER_H */