Function vdev_draid_readable

freebsd/contrib/openzfs/module/zfs/vdev_draid.c:1514–1540

* Determine if the vdev is readable at the given offset. */

 * Determine if the vdev is readable at the given offset.
 */
boolean_t
vdev_draid_readable(vdev_t *vd, uint64_t physical_offset)
{
	if (vd->vdev_ops == &vdev_draid_spare_ops) {
		vd = vdev_draid_spare_get_child(vd, physical_offset);
		if (vd == NULL)
			return (B_FALSE);
	}

	if (vd->vdev_ops == &vdev_spare_ops ||
	    vd->vdev_ops == &vdev_replacing_ops) {

		for (int c = 0; c < vd->vdev_children; c++) {
			vdev_t *cvd = vd->vdev_child[c];

			if (!vdev_readable(cvd))
				continue;

			if (vdev_draid_readable(cvd, physical_offset))
				return (B_TRUE);
		}

		return (B_FALSE);
	}

	return (vdev_readable(vd));
}

/*
 * Returns the first distributed spare found under the provided vdev tree.