REGION_SIZEDEF
if (infop->size > size && !F_ISSET(infop, REGION_SIZEDEF))
regflags = REGION_SIZEDEF;
dblp->reginfo.flags = REGION_SIZEDEF;
F_SET(&dbmp->reginfo, REGION_SIZEDEF);
tmgrp->reginfo.flags = dbenv->tx_max == 0 ? REGION_SIZEDEF : 0;