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;
31 /* Register of per-UID persistent keyrings for this namespace */
32 #ifdef CONFIG_PERSISTENT_KEYRINGS
33 struct key *persistent_keyring_register;
34 struct rw_semaphore persistent_keyring_register_sem;
38 extern struct user_namespace init_user_ns;
42 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
45 atomic_inc(&ns->count);
49 extern int create_user_ns(struct cred *new);
50 extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
51 extern void free_user_ns(struct user_namespace *ns);
53 static inline void put_user_ns(struct user_namespace *ns)
55 if (ns && atomic_dec_and_test(&ns->count))
59 struct seq_operations;
60 extern struct seq_operations proc_uid_seq_operations;
61 extern struct seq_operations proc_gid_seq_operations;
62 extern struct seq_operations proc_projid_seq_operations;
63 extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
64 extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
65 extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
68 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
73 static inline int create_user_ns(struct cred *new)
78 static inline int unshare_userns(unsigned long unshare_flags,
79 struct cred **new_cred)
81 if (unshare_flags & CLONE_NEWUSER)
86 static inline void put_user_ns(struct user_namespace *ns)
92 #endif /* _LINUX_USER_H */