cgroup: introduce cgroup namespaces

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

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 2162dca..a20320c 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -17,6 +17,11 @@
 #include <linux/seq_file.h>
 #include <linux/kernfs.h>
 #include <linux/jump_label.h>
+#include <linux/nsproxy.h>
+#include <linux/types.h>
+#include <linux/ns_common.h>
+#include <linux/nsproxy.h>
+#include <linux/user_namespace.h>
 
 #include <linux/cgroup-defs.h>
 
@@ -611,4 +616,48 @@ static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
 
 #endif /* CONFIG_CGROUP_DATA */
 
+struct cgroup_namespace {
+       atomic_t                count;
+       struct ns_common        ns;
+       struct user_namespace   *user_ns;
+       struct css_set          *root_cset;
+};
+
+extern struct cgroup_namespace init_cgroup_ns;
+
+#ifdef CONFIG_CGROUPS
+
+void free_cgroup_ns(struct cgroup_namespace *ns);
+
+struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
+                                       struct user_namespace *user_ns,
+                                       struct cgroup_namespace *old_ns);
+
+char *cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
+                    struct cgroup_namespace *ns);
+
+#else /* !CONFIG_CGROUPS */
+
+static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
+static inline struct cgroup_namespace *
+copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
+              struct cgroup_namespace *old_ns)
+{
+       return old_ns;
+}
+
+#endif /* !CONFIG_CGROUPS */
+
+static inline void get_cgroup_ns(struct cgroup_namespace *ns)
+{
+       if (ns)
+               atomic_inc(&ns->count);
+}
+
+static inline void put_cgroup_ns(struct cgroup_namespace *ns)
+{
+       if (ns && atomic_dec_and_test(&ns->count))
+               free_cgroup_ns(ns);
+}
+
 #endif /* _LINUX_CGROUP_H */