Function vdev_rebuild_load

freebsd/contrib/openzfs/module/zfs/vdev_rebuild.c:689–730

* Load from disk the top-level vdev's rebuild information. */

 * Load from disk the top-level vdev's rebuild information.
 */
int
vdev_rebuild_load(vdev_t *vd)
{
	vdev_rebuild_t *vr = &vd->vdev_rebuild_config;
	vdev_rebuild_phys_t *vrp = &vr->vr_rebuild_phys;
	spa_t *spa = vd->vdev_spa;
	int err = 0;

	mutex_enter(&vd->vdev_rebuild_lock);
	vd->vdev_rebuilding = B_FALSE;

	if (!spa_feature_is_enabled(spa, SPA_FEATURE_DEVICE_REBUILD)) {
		bzero(vrp, sizeof (uint64_t) * REBUILD_PHYS_ENTRIES);
		mutex_exit(&vd->vdev_rebuild_lock);
		return (SET_ERROR(ENOTSUP));
	}

	ASSERT(vd->vdev_top == vd);

	err = zap_lookup(spa->spa_meta_objset, vd->vdev_top_zap,
	    VDEV_TOP_ZAP_VDEV_REBUILD_PHYS, sizeof (uint64_t),
	    REBUILD_PHYS_ENTRIES, vrp);

	/*
	 * A missing or damaged VDEV_TOP_ZAP_VDEV_REBUILD_PHYS should
	 * not prevent a pool from being imported.  Clear the rebuild
	 * status allowing a new resilver/rebuild to be started.
	 */
	if (err == ENOENT || err == EOVERFLOW || err == ECKSUM) {
		bzero(vrp, sizeof (uint64_t) * REBUILD_PHYS_ENTRIES);
	} else if (err) {
		mutex_exit(&vd->vdev_rebuild_lock);
		return (err);
	}

	vr->vr_prev_scan_time_ms = vrp->vrp_scan_time_ms;
	vr->vr_top_vdev = vd;

	mutex_exit(&vd->vdev_rebuild_lock);

	return (0);
}

/*
 * Each scan thread is responsible for rebuilding a top-level vdev.  The