if err := d.calcError(); err != nil {
		return err
	}
	return d.disk.MakeVol(ctx, volume)
}

func (d *naughtyDisk) ListVols(ctx context.Context) (vols []VolInfo, err error) {
	if err := d.calcError(); err != nil {
		return nil, err
	}
	return d.disk.ListVols(ctx)
}

func (d *naughtyDisk) StatVol(ctx context.Context, volume string) (vol VolInfo, err error) {
	if err := d.calcError(); err != nil {

	// Volume operations.
	MakeVol(ctx context.Context, volume string) (err error)
	MakeVolBulk(ctx context.Context, volumes ...string) (err error)
	ListVols(ctx context.Context) (vols []VolInfo, err error)
	StatVol(ctx context.Context, volume string) (vol VolInfo, err error)
	DeleteVol(ctx context.Context, volume string, forceDelete bool) (err error)