vdev_raidz_exp2
rows[i][j] = vdev_raidz_exp2(rows[i][j], log);
invrows[i][j] = vdev_raidz_exp2(invrows[i][j], log);
vdev_raidz_exp2(rows[i][j], log);
vdev_raidz_exp2(invrows[i][j], log);