From: Li Zefan <lizefan@huawei.com>
To: Tejun Heo <tj@kernel.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>,
LKML <linux-kernel@vger.kernel.org>,
Cgroups <cgroups@vger.kernel.org>
Subject: [PATCH 2/3] cgroup: add cgroup_name() API
Date: Mon, 25 Feb 2013 14:17:49 +0800 [thread overview]
Message-ID: <512B020D.9040504@huawei.com> (raw)
In-Reply-To: <512B01FA.5020506@huawei.com>
cgroup_name() returns the name of a cgroup and it must be called with
rcu_read_lock() held.
This will be used by cpuset.
Signed-off-by: Li Zefan <lizefan@huawei.com>
---
include/linux/cgroup.h | 1 +
kernel/cgroup.c | 14 ++++++++++++++
2 files changed, 15 insertions(+)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 7f21bad..70676eb 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -426,6 +426,7 @@ int cgroup_rm_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_is_removed(const struct cgroup *cgrp);
+char *cgroup_name(const struct cgroup *cgrp);
int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
int cgroup_task_count(const struct cgroup *cgrp);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index eb3c280..abbb097 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1778,6 +1778,20 @@ static struct file_system_type cgroup_fs_type = {
static struct kobject *cgroup_kobj;
/**
+ * cgroup_name - get the name of a cgroup
+ * @cgrp: the cgroup in question
+ *
+ * Must be called with rcu_read_lock() held.
+ */
+char *cgroup_name(const struct cgroup *cgrp)
+{
+ if (!cgrp->parent)
+ return "/";
+ else
+ return rcu_dereference(cgrp->name)->name;
+}
+
+/**
* cgroup_path - generate the path of a cgroup
* @cgrp: the cgroup in question
* @buf: the buffer to write the path into
--
1.8.0.2
next prev parent reply other threads:[~2013-02-25 6:18 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-25 6:17 [PATCH v3 1/3] cgroup: fix cgroup_path() vs rename() race Li Zefan
2013-02-25 6:17 ` Li Zefan [this message]
2013-02-26 2:27 ` [PATCH 2/3] cgroup: add cgroup_name() API Tejun Heo
2013-02-26 10:25 ` Li Zefan
2013-02-26 13:26 ` Tejun Heo
2013-02-27 10:49 ` Li Zefan
2013-02-27 13:23 ` Tejun Heo
2013-02-28 6:53 ` Li Zefan
2013-02-28 14:49 ` Tejun Heo
2013-03-01 6:36 ` Li Zefan
2013-03-01 20:39 ` Al Viro
2013-03-01 20:45 ` Tejun Heo
2013-03-04 3:02 ` Li Zefan
2013-03-04 17:38 ` Tejun Heo
2013-02-25 6:18 ` [PATCH 3/3] cpuset: use cgroup_name() in cpuset_print_task_mems_allowed() Li Zefan
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