Function vdev_load

freebsd/contrib/openzfs/module/zfs/vdev.c:3259–3407

}

int
vdev_load(vdev_t *vd)
{
	int error = 0;

	/*
	 * Recursively load all children.
	 */
	for (int c = 0; c < vd->vdev_children; c++) {
		error = vdev_load(vd->vdev_child[c]);
		if (error != 0) {
			return (error);
		}
	}

	vdev_set_deflate_ratio(vd);

	/*
	 * On spa_load path, grab the allocation bias from our zap
	 */
	if (vd == vd->vdev_top && vd->vdev_top_zap != 0) {
		spa_t *spa = vd->vdev_spa;
		char bias_str[64];

		error = zap_lookup(spa->spa_meta_objset, vd->vdev_top_zap,
		    VDEV_TOP_ZAP_ALLOCATION_BIAS, 1, sizeof (bias_str),
		    bias_str);
		if (error == 0) {
			ASSERT(vd->vdev_alloc_bias == VDEV_BIAS_NONE);
			vd->vdev_alloc_bias = vdev_derive_alloc_bias(bias_str);
		} else if (error != ENOENT) {
			vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
			    VDEV_AUX_CORRUPT_DATA);
			vdev_dbgmsg(vd, "vdev_load: zap_lookup(top_zap=%llu) "
			    "failed [error=%d]", vd->vdev_top_zap, error);
			return (error);
		}
	}

	/*
	 * Load any rebuild state from the top-level vdev zap.
	 */
	if (vd == vd->vdev_top && vd->vdev_top_zap != 0) {
		error = vdev_rebuild_load(vd);
		if (error && error != ENOTSUP) {
			vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
			    VDEV_AUX_CORRUPT_DATA);
			vdev_dbgmsg(vd, "vdev_load: vdev_rebuild_load "
			    "failed [error=%d]", error);
			return (error);
		}
	}

	/*
	 * If this is a top-level vdev, initialize its metaslabs.
	 */
	if (vd == vd->vdev_top && vdev_is_concrete(vd)) {
		vdev_metaslab_group_create(vd);