ZIO_STAGE_DVA_THROTTLE
ZIO_STAGE_DVA_THROTTLE | \
ZIO_STAGE_DVA_THROTTLE | \
ASSERT(zio->io_stage == ZIO_STAGE_DVA_THROTTLE);
ASSERT(nio->io_stage == ZIO_STAGE_DVA_THROTTLE);
ASSERT3U(zio->io_stage, ==, ZIO_STAGE_DVA_THROTTLE);