kro_mappings
md->kro_mappings++;
md->kro_mappings--;
md->kro_mappings--;
md->kro_mappings++;
if (md->kro_mappings || md->krw_mappings > 1)
ro_mappings = md->uro_mappings + md->kro_mappings;
md->kro_mappings++;
md->kro_mappings--;
KASSERT(md->kro_mappings == 0);
KASSERT(omd->kro_mappings == 0);
md->krw_mappings, md->kro_mappings,