emul64_overlap
*overlap = emul64_overlap(&cur->emul64_blocked, sb, blkcnt);
if (emul64_overlap(range, blk->bl_blkno, (size_t)1) != O_NONE) {
rv = emul64_overlap(&nw->emul64_blocked, blkno, (size_t)count);
extern emul64_rng_overlap_t emul64_overlap(emul64_range_t *,