vircgroup: Ensure /machine group is associated with its parent

Call first virCgroupNew on the parent group virCgroupNewPartition if
it is available on before the creation of the child group.  This
ensures that the creation of a first level group on the unified
architecture, as the check at virCgroupV2ParseControllersFile as the
parent file is there.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1760233
Signed-off-by: Miguel Ángel Arruga Vivas <rosen644835@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 77ffc97003a3afe56aa0f0ddadea9c3393a0dbd1..a70ffdf748008d9d3d48ee408637682f10e16d18 100644 (file)
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -847,9 +847,6 @@ virCgroupNewPartition(const char *path,
     if (virCgroupSetPartitionSuffix(path, &newPath) < 0)
         goto cleanup;
 
-    if (virCgroupNew(-1, newPath, NULL, controllers, group) < 0)
-        goto cleanup;
-
     if (STRNEQ(newPath, "/")) {
         char *tmp;
         parentPath = g_strdup(newPath);
@@ -860,7 +857,12 @@ virCgroupNewPartition(const char *path,
 
         if (virCgroupNew(-1, parentPath, NULL, controllers, &parent) < 0)
             goto cleanup;
+    }
 
+    if (virCgroupNew(-1, newPath, parent, controllers, group) < 0)
+        goto cleanup;
+
+    if (parent) {
         if (virCgroupMakeGroup(parent, *group, create, VIR_CGROUP_NONE) < 0)
             goto cleanup;
     }