zio_handle_device_injection
extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
error = zio_handle_device_injection(vd, NULL, ENXIO);
required = !!zio_handle_device_injection(vd, NULL, ECHILD);
zio->io_error = zio_handle_device_injection(vd,