zap_leaf_phys_t
zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
zap_leaf_phys_t *l_phys;
zap_leaf_phys_t *leaf;
l.l_phys = (zap_leaf_phys_t *)(leafblks + li * blksz);
l.l_phys = (zap_leaf_phys_t *)(leafblks + li * blksz);