[libvirt PATCH 06/25] vircgroupv2: detect controllers enabled in parent cgroup

[Pavel Hrdina]

With cgroups v2 working with controllers is a bit more complicated then
with cgroups v1 where the controller had to be mounted.

There are two files, cgroups.controllers and cgroup.subtree_control.
The file cgroup.controllers lists all controllers enabled in the current
cgroup and cgroups.subtree_control, as the name suggest, controls which
controllers are enabled for a subtree of cgroups.

Now the issue here is that the current code doesn't make any difference
if the @parent variable is NULL or not because ../cgroup.subtree_control
will list the same controllers as ./cgroup.controllers.

The whole point of the @parent variable is when we are building the
cgroup topology ourselves without systemd help we need to detect which
controllers are enabled in the parent cgroup in order to enable them for
the current cgroup as well and for that we need to check
cgroup.controllers of the parent group.

Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
 src/util/vircgroupv2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
index fb97b7fd2a..530e5d2ce9 100644
--- a/src/util/vircgroupv2.c
+++ b/src/util/vircgroupv2.c
@@ -255,7 +255,7 @@ virCgroupV2ParseControllersFile(virCgroupPtr group,
     char **tmp;
 
     if (parent) {
-        contFile = g_strdup_printf("%s%s/cgroup.subtree_control",
+        contFile = g_strdup_printf("%s%s/cgroup.controllers",
                                    parent->unified.mountPoint,
                                    NULLSTR_EMPTY(parent->unified.placement));
     } else {
-- 
2.26.2