for i := 0; i < n-1; i++ {
		j = i + rand.Intn(n-i)
		s[i], s[j] = s[j], s[i]
	}
	return s
}

func TestToErrIsNil(t *testing.T) {
	if toObjectErr(nil) != nil {
		t.Errorf("Test expected to return nil, failed instead got a non-nil value %s", toObjectErr(nil))
	}
	if toStorageErr(nil) != nil {
		t.Errorf("Test expected to return nil, failed instead got a non-nil value %s", toStorageErr(nil))
	}

		r.Close()
		return err != nil, nil
	}

	// Caches are read+written without locks,
	retries := 0
	for retries < 5 {
		retry, err := load(name, time.Minute)
		if err != nil {
			return toObjectErr(err, dataUsageBucket, name)
		}
		if !retry {
			break
		}
		retry, err = load(name+".bkp", 30*time.Second)
		if err == nil && !retry {
			// Only return when we have valid data from the backup
			break

	if globalDNSConfig == nil {
		return false
	}
	if globalBucketFederation {
		_, err := objAPI.GetBucketInfo(ctx, bucket, BucketOptions{})
		return err == toObjectErr(errVolumeNotFound, bucket)
	}
	return false
}

// CopyObjectHandler - Copy Object
// ----------
// This implementation of the PUT operation adds an object to a bucket