zpool_refresh_stats
if (zpool_refresh_stats(zhp, &missing) != 0)
extern int zpool_refresh_stats(zpool_handle_t *, boolean_t *);
error = zpool_refresh_stats(zhp, &missing);
if (zpool_refresh_stats(zhp, &missing) != 0) {
if (zpool_refresh_stats(zhp, &missing) != 0) {