VDO_TREE_PAGE
if (!list_empty(&dirty_lists->eras[i][VDO_TREE_PAGE])) {
list_splice_tail_init(&dirty_lists->eras[i][VDO_TREE_PAGE],
&dirty_lists->expired[VDO_TREE_PAGE]);
expired = &zone->dirty_lists->expired[VDO_TREE_PAGE];
add_to_dirty_lists(zone, &tree_page->entry, VDO_TREE_PAGE,
INIT_LIST_HEAD(&zone->dirty_lists->expired[VDO_TREE_PAGE]);
INIT_LIST_HEAD(&zone->dirty_lists->eras[i][VDO_TREE_PAGE]);