diff options
| author | Li Zefan <lizefan@huawei.com> | 2013-04-09 04:00:38 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-04-10 20:07:08 +0200 |
| commit | 78574cf981cd3d9ae9f6adbd466a772310ec24ff (patch) | |
| tree | 50e9da6e2e201663a22e02240d927592e893780d /include | |
| parent | cgroup: make sure parent won't be destroyed before its children (diff) | |
| download | linux-78574cf981cd3d9ae9f6adbd466a772310ec24ff.tar.xz linux-78574cf981cd3d9ae9f6adbd466a772310ec24ff.zip | |
cgroup: implement cgroup_is_descendant()
A couple controllers want to determine whether two cgroups are in
ancestor/descendant relationship. As it's more likely that the
descendant is the primary subject of interest and there are other
operations focusing on the descendants, let's ask is_descendent rather
than is_ancestor.
Implementation is trivial as the previous patch guarantees that all
ancestors of a cgroup stay accessible as long as the cgroup is
accessible.
tj: Removed depth optimization, renamed from cgroup_is_ancestor(),
rewrote descriptions.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cgroup.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 92acf8601ae0..a2b9d4b13369 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -439,6 +439,7 @@ int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts); int cgroup_rm_cftypes(struct cgroup_subsys *ss, struct cftype *cfts); int cgroup_is_removed(const struct cgroup *cgrp); +bool cgroup_is_descendant(struct cgroup *cgrp, struct cgroup *ancestor); int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen); |