spa_scan
error = spa_scan(spa, POOL_SCAN_SCRUB);
(void) spa_scan(spa, POOL_SCAN_SCRUB);
(void) spa_scan(spa, POOL_SCAN_SCRUB);
(void) spa_scan(spa, POOL_SCAN_SCRUB);
extern int spa_scan(spa_t *spa, pool_scan_func_t func);
error = spa_scan(spa, zc->zc_cookie);