diff options
| author | Tejun Heo <tj@kernel.org> | 2013-08-08 20:11:22 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-08-08 20:11:22 -0400 |
| commit | 72c97e54e0f043d33b246d7460ae0a36c4b8c643 (patch) | |
| tree | 6ab5c1866671d43451aa2a03a0d3e68fada2f291 | |
| parent | 3f79851831a135c5cebbcaa8cddb07d02870b069 (diff) | |
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.h | 9 | ||||
| -rw-r--r-- | kernel/cgroup.c | 1 |
2 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 552c5feef733..821678aae4db 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 0b3caa3220cb..4234428f1014 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) |