spa_l2cache_exists
if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
spa_l2cache_exists(vd->vdev_guid, NULL)))
!spa_l2cache_exists(device_guid, NULL))
if (spa_l2cache_exists(device_guid, NULL))