[PATCH -mm v2 3/7] cgroup: release css->id after css_free
From: Vladimir Davydov <hidden>
Date: 2015-01-19 11:24:04
Also in:
linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
Currently, we release css->id in css_release_work_fn, right before calling css_free callback, so that when css_free is called, the id may have already been reused for a new cgroup. I am going to use css->id to create unique names for per memcg kmem caches. Since kmem caches are destroyed only on css_free, I need css->id to be freed after css_free was called to avoid name clashes. This patch therefore moves css->id removal to css_free_work_fn. To prevent css_from_id from returning a pointer to a stale css, it makes css_release_work_fn replace the css ptr at css_idr:css->id with NULL. Signed-off-by: Vladimir Davydov <redacted> --- kernel/cgroup.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 6ffd3ae52bf8..7bd3e0f0f341 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c@@ -4373,16 +4373,20 @@ static void css_free_work_fn(struct work_struct *work) { struct cgroup_subsys_state *css = container_of(work, struct cgroup_subsys_state, destroy_work); + struct cgroup_subsys *ss = css->ss; struct cgroup *cgrp = css->cgroup; percpu_ref_exit(&css->refcnt); - if (css->ss) { + if (ss) { /* css free path */ + int id = css->id; + if (css->parent) css_put(css->parent); - css->ss->css_free(css); + ss->css_free(css); + cgroup_idr_remove(&ss->css_idr, id); cgroup_put(cgrp); } else { /* cgroup free path */
@@ -4434,7 +4438,7 @@ static void css_release_work_fn(struct work_struct *work) if (ss) { /* css release path */ - cgroup_idr_remove(&ss->css_idr, css->id); + cgroup_idr_replace(&ss->css_idr, NULL, css->id); if (ss->css_released) ss->css_released(css); } else {
--
1.7.10.4
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