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cgroups: net_cls as module 

Allows the net_cls cgroup subsystem to be compiled as a module

This patch modifies net/sched/cls_cgroup.c to allow the net_cls subsystem
to be optionally compiled as a module instead of builtin.  The
cgroup_subsys struct is moved around a bit to allow the subsys_id to be
either declared as a compile-time constant by the cgroup_subsys.h include
in cgroup.h, or, if it's a module, initialized within the struct by
cgroup_load_subsys.

Signed-off-by: Ben Blum <bblum@andrew.cmu.edu>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Blum 2010-03-23 05:24:03 +00:00 committed by David S. Miller
parent 688328c7ec
commit 8e039d84b3
2 changed files with 31 additions and 10 deletions
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5
net/sched/Kconfig
View File

@ -328,13 +328,16 @@ config NET_CLS_FLOW
module will be called cls_flow.
config NET_CLS_CGROUP
bool "Control Group Classifier"
tristate "Control Group Classifier"
select NET_CLS
depends on CGROUPS
---help---
Say Y here if you want to classify packets based on the control
cgroup of their process.
To compile this code as a module, choose M here: the
module will be called cls_cgroup.
config NET_EMATCH
bool "Extended Matches"
select NET_CLS

36
net/sched/cls_cgroup.c
View File

@ -24,6 +24,25 @@ struct cgroup_cls_state
u32 classid;
};
static struct cgroup_subsys_state *cgrp_create(struct cgroup_subsys *ss,
struct cgroup *cgrp);
static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp);
static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp);
struct cgroup_subsys net_cls_subsys = {
.name = "net_cls",
.create = cgrp_create,
.destroy = cgrp_destroy,
.populate = cgrp_populate,
#ifdef CONFIG_NET_CLS_CGROUP
.subsys_id = net_cls_subsys_id,
#else
#define net_cls_subsys_id net_cls_subsys.subsys_id
#endif
.module = THIS_MODULE,
};
static inline struct cgroup_cls_state *cgrp_cls_state(struct cgroup *cgrp)
{
return container_of(cgroup_subsys_state(cgrp, net_cls_subsys_id),
@ -79,14 +98,6 @@ static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files));
}
struct cgroup_subsys net_cls_subsys = {
.name = "net_cls",
.create = cgrp_create,
.destroy = cgrp_destroy,
.populate = cgrp_populate,
.subsys_id = net_cls_subsys_id,
};
struct cls_cgroup_head
{
u32 handle;
@ -277,12 +288,19 @@ static struct tcf_proto_ops cls_cgroup_ops __read_mostly = {
static int __init init_cgroup_cls(void)
{
return register_tcf_proto_ops(&cls_cgroup_ops);
int ret = register_tcf_proto_ops(&cls_cgroup_ops);
if (ret)
return ret;
ret = cgroup_load_subsys(&net_cls_subsys);
if (ret)
unregister_tcf_proto_ops(&cls_cgroup_ops);
return ret;
}
static void __exit exit_cgroup_cls(void)
{
unregister_tcf_proto_ops(&cls_cgroup_ops);
cgroup_unload_subsys(&net_cls_subsys);
}
module_init(init_cgroup_cls);