Cache user_ns in struct cred
[linux-2.6.git] / include / linux / cred.h
index 9aeeb0b..be16b61 100644 (file)
@@ -146,6 +146,7 @@ struct cred {
        void            *security;      /* subjective LSM security */
 #endif
        struct user_struct *user;       /* real user ID subscription */
+       struct user_namespace *user_ns; /* cached user->user_ns */
        struct group_info *group_info;  /* supplementary groups for euid/fsgid */
        struct rcu_head rcu;            /* RCU deletion hook */
 };
@@ -354,10 +355,15 @@ static inline void put_cred(const struct cred *_cred)
 #define current_fsgid()        (current_cred_xxx(fsgid))
 #define current_cap()          (current_cred_xxx(cap_effective))
 #define current_user()         (current_cred_xxx(user))
-#define _current_user_ns()     (current_cred_xxx(user)->user_ns)
 #define current_security()     (current_cred_xxx(security))
 
-extern struct user_namespace *current_user_ns(void);
+#ifdef CONFIG_USER_NS
+#define current_user_ns() (current_cred_xxx(user_ns))
+#else
+extern struct user_namespace init_user_ns;
+#define current_user_ns() (&init_user_ns)
+#endif
+
 
 #define current_uid_gid(_uid, _gid)            \
 do {                                           \