HAMMER_RESF_LAYER2FREE
resv->flags &= ~HAMMER_RESF_LAYER2FREE;
resv->flags &= ~HAMMER_RESF_LAYER2FREE;
resx->flags |= HAMMER_RESF_LAYER2FREE;
if (resv->refs == 1 && (resv->flags & HAMMER_RESF_LAYER2FREE)) {
resv->flags |= HAMMER_RESF_LAYER2FREE;
resv->flags |= HAMMER_RESF_LAYER2FREE;