kernel: add a helper to get an owning user namespace for a namespace

[cascardo/linux.git] / include / linux / user_namespace.h

diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 9217169..190cf07 100644 (file)
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -73,6 +73,8 @@ extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t,
 extern int proc_setgroups_show(struct seq_file *m, void *v);
 extern bool userns_may_setgroups(const struct user_namespace *ns);
 extern bool current_in_userns(const struct user_namespace *target_ns);
+
+struct ns_common *ns_get_owner(struct ns_common *ns);
 #else
 
 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
@@ -106,6 +108,11 @@ static inline bool current_in_userns(const struct user_namespace *target_ns)
 {
        return true;
 }
+
+static inline struct ns_common *ns_get_owner(struct ns_common *ns)
+{
+       return ERR_PTR(-EPERM);
+}
 #endif
 
 #endif /* _LINUX_USER_H */