HAMMER_IOTYPE_META_BUFFER
if (io->type == HAMMER_IOTYPE_META_BUFFER) {
case HAMMER_IOTYPE_META_BUFFER:
iotype = HAMMER_IOTYPE_META_BUFFER;
io->type == HAMMER_IOTYPE_META_BUFFER) {
case HAMMER_IOTYPE_META_BUFFER:
case HAMMER_IOTYPE_META_BUFFER: