vircgroup: extract virCgroupV1HasEmptyTasks

Reviewed-by: NFabiano Fidêncio <fidencio@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/util/vircgroup.c

@@ -3461,18 +3461,7 @@ virCgroupSupportsCpuBW(virCgroupPtr cgroup)
 int
 virCgroupHasEmptyTasks(virCgroupPtr cgroup, int controller)
 {
-    int ret = -1;
-    VIR_AUTOFREE(char *) content = NULL;
-
-    if (!cgroup)
-        return -1;
-
-    ret = virCgroupGetValueStr(cgroup, controller, "tasks", &content);
-
-    if (ret == 0 && content[0] == '\0')
-        ret = 1;
-
-    return ret;
+    return cgroup->backend->hasEmptyTasks(cgroup, controller);
 }
 
 bool

src/util/vircgroupbackend.h

@@ -122,6 +122,10 @@ typedef int
                       pid_t pid,
                       unsigned int flags);
 
+typedef int
+(*virCgroupHasEmptyTasksCB)(virCgroupPtr cgroup,
+                            int controller);
+
 struct _virCgroupBackend {
     virCgroupBackendType type;
 
@@ -141,6 +145,7 @@ struct _virCgroupBackend {
     virCgroupMakeGroupCB makeGroup;
     virCgroupRemoveCB remove;
     virCgroupAddTaskCB addTask;
+    virCgroupHasEmptyTasksCB hasEmptyTasks;
 };
 typedef struct _virCgroupBackend virCgroupBackend;
 typedef virCgroupBackend *virCgroupBackendPtr;

src/util/vircgroupv1.c

@@ -735,6 +735,25 @@ virCgroupV1AddTask(virCgroupPtr group,
 }
 
 
+static int
+virCgroupV1HasEmptyTasks(virCgroupPtr cgroup,
+                         int controller)
+{
+    int ret = -1;
+    VIR_AUTOFREE(char *) content = NULL;
+
+    if (!cgroup)
+        return -1;
+
+    ret = virCgroupGetValueStr(cgroup, controller, "tasks", &content);
+
+    if (ret == 0 && content[0] == '\0')
+        ret = 1;
+
+    return ret;
+}
+
+
 virCgroupBackend virCgroupV1Backend = {
     .type = VIR_CGROUP_BACKEND_TYPE_V1,
 
@@ -753,6 +772,7 @@ virCgroupBackend virCgroupV1Backend = {
     .makeGroup = virCgroupV1MakeGroup,
     .remove = virCgroupV1Remove,
     .addTask = virCgroupV1AddTask,
+    .hasEmptyTasks = virCgroupV1HasEmptyTasks,
 };