var MountParseRegexp = regexp.MustCompilePOSIX("^([^ ]*)[ \t]*([^ ]*)[ \t]*([^ ]*)") // Ignore options etc.

var MountsFile = "/proc/self/mounts"

type LinuxVolumeQuotaApplier interface {
	// GetQuotaOnDir gets the quota ID (if any) that applies to
	// 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.
	// Implementations should not check /etc/project or /etc/projid,
	// only whether their underlying mechanism already has the ID in
	// use.
	// Return value of false with no error means that the ID is not
	// in use; true means that it is already in use.  An error
	// return means that any quota ID will fail.
	QuotaIDIsInUse(id QuotaID) (bool, error)

	// GetConsumption returns the consumption (in bytes) of the
	// directory, determined by the implementation's quota-based
	// mechanism.  If it is unable to do so using that mechanism,
	// it should return an error and allow higher layers to
	// enumerate the directory.
	GetConsumption(path string, id QuotaID) (int64, error)

	// GetInodes returns the number of inodes used by the
	// directory, determined by the implementation's quota-based
	// mechanism.  If it is unable to do so using that mechanism,
	// it should return an error and allow higher layers to
	// enumerate the directory.
	GetInodes(path string, id QuotaID) (int64, error)
}

type LinuxVolumeQuotaProvider interface {
	// GetQuotaApplier retrieves an object that can apply
	// quotas (or nil if this provider cannot support quotas
	// on the device)
	GetQuotaApplier(mountpoint string, backingDev string) LinuxVolumeQuotaApplier
}

type QuotaID int32

const (
	// UnknownQuotaID -- cannot determine whether a quota is in force
	UnknownQuotaID QuotaID = -1
	// BadQuotaID -- Invalid quota
	BadQuotaID QuotaID = 0
)

var FirstQuota QuotaID = 1048577

type QuotaType int

const (
	// FSQuotaAccounting for quotas for accounting only
	FSQuotaAccounting QuotaType = 1 << iota
	// FSQuotaEnforcing for quotas for enforcement
	FSQuotaEnforcing QuotaType = 1 << iota
)

type VolumeProvider struct {
}