cgroup: implement CFTYPE_ONLY_ON_DFL
This cftype flag makes the file only appear on the default hierarchy.
This will later be used for cgroup.controllers file.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 7e9fa50..43d1ed3 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -384,6 +384,7 @@
CFTYPE_NOT_ON_ROOT = (1 << 1), /* don't create on root cgrp */
CFTYPE_INSANE = (1 << 2), /* don't create if sane_behavior */
CFTYPE_NO_PREFIX = (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */
+ CFTYPE_ONLY_ON_DFL = (1 << 4), /* only on default hierarchy */
};
#define MAX_CFTYPE_NAME 64