tree 1838b5081b2ecf1bc04f215fb3468ff43d4af4cf
parent d54f19153b3101c3cf53e331ce314d24c7aab001
author Tejun Heo <tj@kernel.org> 1353122623 -0800
committer Tejun Heo <tj@kernel.org> 1353122623 -0800

netcls_cgroup: implement proper hierarchy support

netcls_cgroup implemented rather weird hierarchy behavior.  A new
cgroup would inherit configuration from its parent but once created it
operates independently from its parent - updates to a parent doesn't
affect its children.

Proper hierarchy behavior can easily be implemented using cgroup
descendant iterator and the is_local flag.  Writing a positive value
to "net_cls.classid" updates the cgroup's classid and propagates the
classid downwards.  Writing a negative value removes the local config
and makes it inherit the parent's classid, and the inherited classid
is propagated downwards.

This makes netcls_cgroup properly hierarchical and behave the same way
as netprio_cgroup.

Signed-off-by: Tejun Heo <tj@kernel.org>