func (o *snapshotter) Update(ctx context.Context, info snapshots.Info, fieldpaths ...string) (snapshots.Info, error) {
 	ctx, t, err := o.ms.TransactionContext(ctx, true)
 	if err != nil {
 		return snapshots.Info{}, err
 	}

 	rollback := true
 	defer func() {
 		if rollback {
 			if rerr := t.Rollback(); rerr != nil {
 				log.G(ctx).WithError(rerr).Warn("failed to rollback transaction")
 			}
 		}
 	}()

 	info, err = storage.UpdateInfo(ctx, info, fieldpaths...)
 	if err != nil {
 		return snapshots.Info{}, err
 	}

 	if o.upperdirLabel {
 		id, _, _, err := storage.GetInfo(ctx, info.Name)
 		if err != nil {
 			return snapshots.Info{}, err
 		}
 		if info.Labels == nil {
 			info.Labels = make(map[string]string)
 		}
 		info.Labels[upperdirKey] = o.upperPath(id)
 	}

 	rollback = false
 	if err := t.Commit(); err != nil {
 		return snapshots.Info{}, err
 	}

 	return info, nil
 }

func (o *snapshotter) Update(ctx context.Context, info snapshots.Info, fieldpaths ...string) (newInfo snapshots.Info, err error) {
	err = o.ms.WithTransaction(ctx, true, func(ctx context.Context) error {
		newInfo, err = storage.UpdateInfo(ctx, info, fieldpaths...)
		if err != nil {
			return err
		}

		if o.upperdirLabel {
			id, _, _, err := storage.GetInfo(ctx, newInfo.Name)
			if err != nil {
				return err
			}
			if newInfo.Labels == nil {
				newInfo.Labels = make(map[string]string)
			}
			newInfo.Labels[upperdirKey] = o.upperPath(id)
		}
		return nil
	})
	return newInfo, err
}