ztest_shared_ds_t
ztest_zd_init(ztest_ds_t *zd, ztest_shared_ds_t *szd, objset_t *os)
static ztest_shared_ds_t *ztest_shared_ds;
ztest_shared_ds_t *zd_shared;
hdr->zh_ds_size = sizeof (ztest_shared_ds_t);