[PATCH 1/7] netcls_cgroup: move config inheritance to ->css_online() and remove .broken_hierarchy marking

Tejun Heo
2012-11-20T08:30:28Z

It turns out that we'll have to live with attributes which are
inherited at cgroup creation time but not affected by further updates
to the parent afterwards - such attributes are already in wide use
e.g. for cpuset.

So, there's nothing to do for netcls_cgroup for hierarchy support.
Its current behavior - inherit only during creation - is good enough.

Move config inheriting from ->css_alloc() to ->css_online() for
consistency, which doesn't change behavior at all, and remove
.broken_hierarchy marking.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
net/sched/cls_cgroup.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 8cdc18e..31f06b6 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -41,11 +41,15 @@ static struct cgroup_subsys_state *cgrp_css_alloc(struct cgroup *cgrp)
cs = kzalloc(sizeof(*cs), GFP_KERNEL);
if (!cs)
return ERR_PTR(-ENOMEM);
+ return &cs->css;
+}

+static int cgrp_css_online(struct cgroup *cgrp)
+{
if (cgrp->parent)
- cs->classid = cgrp_cls_state(cgrp->parent)->classid;
-
- return &cs->css;
+ cgrp_cls_state(cgrp)->classid =
+ cgrp_cls_state(cgrp->parent)->classid;
+ return 0;
}

static void cgrp_css_free(struct cgroup *cgrp)
@@ -76,19 +80,11 @@ static struct cftype ss_files[] = {
struct cgroup_subsys net_cls_subsys = {
.name = "net_cls",
.css_alloc = cgrp_css_alloc,
+ .css_online = cgrp_css_online,
.css_free = cgrp_css_free,
.subsys_id = net_cls_subsys_id,
.base_cftypes = ss_files,
.module = THIS_MODULE,
-
- /*
- * While net_cls cgroup has the rudimentary hierarchy support of
- * inheriting the parent's classid on cgroup creation, it doesn't
- * properly propagates config changes in ancestors to their
- * descendents. A child should follow the parent's configuration
- * but be allowed to override it. Fix it and remove the following.
- */
- .broken_hierarchy = true,
};

struct cls_cgroup_head {
--
1.7.11.7