zfs_spa_version
if (zfs_spa_version(zhp, &spa_version) < 0)
if (zfs_spa_version(zhp, &pool_version) != 0) {
extern int zfs_spa_version(zfs_handle_t *, int *);
if (zfs_spa_version(zhp, &spa_version) < 0)
VERIFY(zfs_spa_version(zhp, &spa_version) == 0);
zfs_spa_version(zhp, &spa_version) == 0 &&
zfs_spa_version(zhp, &spa_version) == 0 &&