code: func diskSpecForCreate(dss *object.HostDatastoreSystem, name string) (*types.VmfsDatastoreCreateSpec, error) {
  	disk, err := availableScsiDisk(dss, name)
  	if err != nil {
  		return nil, err
  	}
  
  	ctx, cancel := context.WithTimeout(context.Background(), defaultAPITimeout)
  	defer cancel()
  	options, err := dss.QueryVmfsDatastoreCreateOptions(ctx, disk.DevicePath)
  	if err != nil {
  		return nil, fmt.Errorf("could not get disk creation options for %q: %s", name, err)
  	}
  	var option *types.VmfsDatastoreOption
  	for _, o := range options {
  		if _, ok := o.Info.(*types.VmfsDatastoreAllExtentOption); ok {
  			option = &o
  			break
  		}
  	}
  	if option == nil {
  		return nil, fmt.Errorf("device %q is not available as a new whole-disk device for datastore", name)
  	}
  	return option.Spec.(*types.VmfsDatastoreCreateSpec), nil
  }
docs: // diskSpecForCreate checks to make sure that a disk is available to be used to
  // create a VMFS datastore, specifically in its entirety, and returns a
  // respective VmfsDatastoreCreateSpec.