// this directory
	GetQuotaOnDir(path string) (QuotaID, error)

	// SetQuotaOnDir applies the specified quota ID to a directory.
	// Negative value for bytes means that a non-enforcing quota
	// should be applied (perhaps by setting a quota too large to
	// be hit)
	SetQuotaOnDir(path string, id QuotaID, bytes int64) error

	// QuotaIDIsInUse determines whether the quota ID is in use.

}

func clearApplier(path string) {
	dirApplierLock.Lock()
	defer dirApplierLock.Unlock()
	delete(dirApplierMap, path)
}

func setQuotaOnDir(path string, id common.QuotaID, bytes int64) error {
	return getApplier(path).SetQuotaOnDir(path, id, bytes)
}

func GetQuotaOnDir(m mount.Interface, path string) (common.QuotaID, error) {
	_, _, err := getFSInfo(m, path)
	if err != nil {

	if err != nil {
		return BadQuotaID, fmt.Errorf("unable to parse project ID from %s (%v)", match[1], err)
	}
	return QuotaID(projid), nil
}

// SetQuotaOnDir applies a quota to the specified directory under the specified mountpoint.
func (v linuxVolumeQuotaApplier) SetQuotaOnDir(path string, id QuotaID, bytes int64) error {
	if bytes < 0 || bytes > v.maxQuota {
		bytes = v.maxQuota
	}

	if strings.HasPrefix(mountpoint, "/quota2") {
		return testVolumeQuota{}
	}
	return nil
}

func (v testVolumeQuota) SetQuotaOnDir(dir string, id common.QuotaID, _ int64) error {
	odir, ok := testIDQuotaMap[id]
	if ok && dir != odir {
		return fmt.Errorf("ID %v is already in use", id)
	}
	oid, ok := testQuotaIDMap[dir]
	if ok && id != oid {