Function vdev_draid_partial

freebsd/contrib/openzfs/module/zfs/vdev_draid.c:1457–1509

* Returns true if the txg is only partially replicated on the leaf vdevs. */

 * Returns true if the txg is only partially replicated on the leaf vdevs.
 */
static boolean_t
vdev_draid_partial(vdev_t *vd, uint64_t physical_offset, uint64_t txg,
    uint64_t size)
{
	if (vd->vdev_ops == &vdev_spare_ops ||
	    vd->vdev_ops == &vdev_replacing_ops) {
		/*
		 * Check all of the readable children, if any child is
		 * missing the txg range then it is partially replicated.
		 */
		for (int c = 0; c < vd->vdev_children; c++) {
			vdev_t *cvd = vd->vdev_child[c];

			if (!vdev_readable(cvd))
				continue;

			if (vdev_draid_partial(cvd, physical_offset, txg, size))
				return (B_TRUE);
		}

		return (B_FALSE);
	}

	if (vd->vdev_ops == &vdev_draid_spare_ops) {
		/*
		 * When sequentially resilvering we don't have a proper
		 * txg range so instead we must presume all txgs are
		 * missing on this vdev until the resilver completes.
		 */
		if (vd->vdev_rebuild_txg != 0)
			return (B_TRUE);

		/*
		 * DTL_MISSING is set for all prior txgs when a resilver
		 * is started in spa_vdev_attach().
		 */
		if (vdev_dtl_contains(vd, DTL_MISSING, txg, size))
			return (B_TRUE);

		/*
		 * Consult the DTL on the relevant vdev. Either a vdev
		 * leaf or spare/replace mirror child may be returned so
		 * we must recursively call vdev_draid_missing_impl().
		 */
		vd = vdev_draid_spare_get_child(vd, physical_offset);
		if (vd == NULL)
			return (B_TRUE);

		return (vdev_draid_partial(vd, physical_offset, txg, size));
	}

	return (vdev_dtl_contains(vd, DTL_MISSING, txg, size));
}

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