dbFindLeaf
rc = dbFindLeaf((dmtree_t *) dcp, l2nb, &leafidx, true);
if (dbFindLeaf((dmtree_t *) &dp->tree, l2nb, &leafidx, false))
static int dbFindLeaf(dmtree_t *tp, int l2nb, int *leafidx, bool is_ctl);