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authorTejun Heo <tj@kernel.org>2015-11-20 23:55:52 +0300
committerTejun Heo <tj@kernel.org>2015-11-20 23:55:52 +0300
commit16af439645455fbf36984ca5e72f31073ee19ab7 (patch)
treec63b8ea7f219c1c9c2d0508ceb5f8abc78f231a4 /include/linux/cgroup.h
parentbd96f76a2454c6b97d70945902e30b4c31510678 (diff)
downloadlinux-16af439645455fbf36984ca5e72f31073ee19ab7.tar.xz
cgroup: implement cgroup_get_from_path() and expose cgroup_put()
Implement cgroup_get_from_path() using kernfs_walk_and_get() which obtains a default hierarchy cgroup from its path. This will be used to allow cgroup path based matching from outside cgroup proper - e.g. networking and perf. v2: Add EXPORT_SYMBOL_GPL(cgroup_get_from_path). Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index b5ee2c4210f9..4c3ffab81ba7 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -81,6 +81,8 @@ struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,
struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
struct cgroup_subsys *ss);
+struct cgroup *cgroup_get_from_path(const char *path);
+
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
@@ -351,6 +353,11 @@ static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
percpu_ref_put_many(&css->refcnt, n);
}
+static inline void cgroup_put(struct cgroup *cgrp)
+{
+ css_put(&cgrp->self);
+}
+
/**
* task_css_set_check - obtain a task's css_set with extra access conditions
* @task: the task to obtain css_set for