Function ztest_fzap

freebsd/contrib/openzfs/cmd/ztest/ztest.c:5267–5309

* Test case to test the upgrading of a microzap to fatzap. */

 * Test case to test the upgrading of a microzap to fatzap.
 */
void
ztest_fzap(ztest_ds_t *zd, uint64_t id)
{
	objset_t *os = zd->zd_os;
	ztest_od_t *od;
	uint64_t object, txg;
	int i;

	od = umem_alloc(sizeof (ztest_od_t), UMEM_NOFAIL);
	ztest_od_init(od, id, FTAG, 0, DMU_OT_ZAP_OTHER, 0, 0, 0);

	if (ztest_object_init(zd, od, sizeof (ztest_od_t),
	    !ztest_random(2)) != 0)
		goto out;
	object = od->od_object;

	/*
	 * Add entries to this ZAP and make sure it spills over
	 * and gets upgraded to a fatzap. Also, since we are adding
	 * 2050 entries we should see ptrtbl growth and leaf-block split.
	 */
	for (i = 0; i < 2050; i++) {
		char name[ZFS_MAX_DATASET_NAME_LEN];
		uint64_t value = i;
		dmu_tx_t *tx;
		int error;

		(void) snprintf(name, sizeof (name), "fzap-%llu-%llu",
		    (u_longlong_t)id, (u_longlong_t)value);

		tx = dmu_tx_create(os);
		dmu_tx_hold_zap(tx, object, B_TRUE, name);
		txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
		if (txg == 0)
			goto out;
		error = zap_add(os, object, name, sizeof (uint64_t), 1,
		    &value, tx);
		ASSERT(error == 0 || error == EEXIST);
		dmu_tx_commit(tx);
	}
out:
	umem_free(od, sizeof (ztest_od_t));
}

/* ARGSUSED */
void