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authorTejun Heo <tj@kernel.org>2014-11-18 10:49:52 +0300
committerTejun Heo <tj@kernel.org>2014-11-18 10:49:52 +0300
commiteeecbd1971517103e06f11750dd1a9a1dc37e4e6 (patch)
treeace58390ca7f2e7f7530a8a8b23d9449a00ae3be /include/linux/cgroup.h
parent56c807ba4e91f0980567b6a69de239677879b17f (diff)
downloadlinux-eeecbd1971517103e06f11750dd1a9a1dc37e4e6.tar.xz
cgroup: implement cgroup_get_e_css()
Implement cgroup_get_e_css() which finds and gets the effective css for the specified cgroup and subsystem combination. This function always returns a valid pinned css. This will be used by cgroup writeback support. While at it, add comment to cgroup_e_css() to explain why that function is different from cgroup_get_e_css() and has to test cgrp->child_subsys_mask instead of cgroup_css(cgrp, ss). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Zefan Li <lizefan@huawei.com>
Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 3a04aeb8b5a1..9fd99f5e699f 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -910,6 +910,8 @@ void css_task_iter_end(struct css_task_iter *it);
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
+struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,
+ struct cgroup_subsys *ss);
struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
struct cgroup_subsys *ss);