summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2013-08-08 20:11:22 -0400
committerTejun Heo <tj@kernel.org>2013-08-08 20:11:22 -0400
commit72c97e54e0f043d33b246d7460ae0a36c4b8c643 (patch)
tree6ab5c1866671d43451aa2a03a0d3e68fada2f291
parent3f79851831a135c5cebbcaa8cddb07d02870b069 (diff)
downloadop-kernel-dev-72c97e54e0f043d33b246d7460ae0a36c4b8c643.zip
op-kernel-dev-72c97e54e0f043d33b246d7460ae0a36c4b8c643.tar.gz
cgroup: add subsystem pointer to cgroup_subsys_state
Currently, given a cgroup_subsys_state, there's no way to find out which subsystem the css is for, which we'll need to convert the cgroup controller API to primarily use @css instead of @cgroup. This patch adds cgroup_subsys_state->ss which points to the subsystem the @css belongs to. While at it, remove the comment about accessing @css->cgroup to determine the hierarchy. cgroup core will provide API to traverse hierarchy of css'es and we don't want subsystems to directly walk cgroup hierarchies anymore. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
-rw-r--r--include/linux/cgroup.h9
-rw-r--r--kernel/cgroup.c1
2 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 552c5fe..821678a 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -66,13 +66,12 @@ enum cgroup_subsys_id {
/* Per-subsystem/per-cgroup state maintained by the system. */
struct cgroup_subsys_state {
- /*
- * The cgroup that this subsystem is attached to. Useful
- * for subsystems that want to know about the cgroup
- * hierarchy structure
- */
+ /* the cgroup that this css is attached to */
struct cgroup *cgroup;
+ /* the cgroup subsystem that this css is attached to */
+ struct cgroup_subsys *ss;
+
/* reference count - access via css_[try]get() and css_put() */
struct percpu_ref refcnt;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 0b3caa3..4234428 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4186,6 +4186,7 @@ static void init_cgroup_css(struct cgroup_subsys_state *css,
struct cgroup *cgrp)
{
css->cgroup = cgrp;
+ css->ss = ss;
css->flags = 0;
css->id = NULL;
if (cgrp == cgroup_dummy_top)
OpenPOWER on IntegriCloud