// 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.
	// Implementations should not check /etc/project or /etc/projid,
	// only whether their underlying mechanism already has the ID in
	// use.

func (v linuxVolumeQuotaApplier) GetInodes(_ string, id QuotaID) (int64, error) {
	return getQuantity(v.mountpoint, id, "-i", 1, v.allowEmptyOutput)
}

// QuotaIDIsInUse checks whether the specified quota ID is in use on the specified
// filesystem
func (v linuxVolumeQuotaApplier) QuotaIDIsInUse(id QuotaID) (bool, error) {
	bytes, err := v.GetConsumption(v.mountpoint, id)
	if err != nil {
		return false, err
	}
	if bytes > 0 {