ztest_write
(void) ztest_write(zd, object, offset, sizeof (wbt), &wbt);
(void) ztest_write(zd, object, offset, blocksize, data);
(void) ztest_write(zd, object, offset, blocksize, data);
(void) ztest_write(zd, object, offset, blocksize, data);
if (ztest_write(zd, od[0].od_object, randoff, blocksize,