HAMMER_IOTYPE_DUMMY
case HAMMER_IOTYPE_DUMMY:
if (ionext && ionext->type == HAMMER_IOTYPE_DUMMY)
iotype = HAMMER_IOTYPE_DUMMY;
case HAMMER_IOTYPE_DUMMY:
case HAMMER_IOTYPE_DUMMY:
iodummy.type = HAMMER_IOTYPE_DUMMY;
if (io && io->type == HAMMER_IOTYPE_DUMMY)