HAMMER_IOC_MIRROR_SIGNATURE
if (pickup->signature != HAMMER_IOC_MIRROR_SIGNATURE) {
if (mrechd.signature != HAMMER_IOC_MIRROR_SIGNATURE) {
mrec->head.signature = HAMMER_IOC_MIRROR_SIGNATURE;
mrec.head.signature = HAMMER_IOC_MIRROR_SIGNATURE;
mrec.head.signature = HAMMER_IOC_MIRROR_SIGNATURE;
mrec.head.signature = HAMMER_IOC_MIRROR_SIGNATURE;
if (mrec.head.signature != HAMMER_IOC_MIRROR_SIGNATURE) {