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authorGrzegorz Nosek <root@localdomain.pl>2009-04-02 16:57:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:04:53 -0700
commit313e924c0852943e67335fad9d2608701f0dfe8e (patch)
treefa4c3f65a7ed6edea52ae78b012138ebab1420c3 /include/linux
parentd20a390a0ee2bf2f692c539c6ce1c829e1080bb5 (diff)
cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups
The ns_proxy cgroup allows moving processes to child cgroups only one level deep at a time. This commit relaxes this restriction and makes it possible to attach tasks directly to grandchild cgroups, e.g.: ($pid is in the root cgroup) echo $pid > /cgroup/CG1/CG2/tasks Previously this operation would fail with -EPERM and would have to be performed as two steps: echo $pid > /cgroup/CG1/tasks echo $pid > /cgroup/CG1/CG2/tasks Also, the target cgroup no longer needs to be empty to move a task there. Signed-off-by: Grzegorz Nosek <root@localdomain.pl> Acked-by: Serge Hallyn <serue@us.ibm.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/cgroup.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index bb8feb9fecc..788c4964c14 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -348,8 +348,8 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
int cgroup_task_count(const struct cgroup *cgrp);
-/* Return true if the cgroup is a descendant of the current cgroup */
-int cgroup_is_descendant(const struct cgroup *cgrp);
+/* Return true if cgrp is a descendant of the task's cgroup */
+int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task);
/* Control Group subsystem type. See Documentation/cgroups.txt for details */