@@ -12,11 +12,11 @@ import (

 	"path/filepath"

 	"strconv"

 	"strings"

-	"syscall"

 	"sync"

+	"syscall"

 )

-const (

+var (

 	defaultDataLoopbackSize     int64  = 100 * 1024 * 1024 * 1024

 	defaultMetaDataLoopbackSize int64  = 2 * 1024 * 1024 * 1024

 	defaultBaseFsSize           uint64 = 10 * 1024 * 1024 * 1024

@@ -47,6 +47,30 @@ type DeviceSetDM struct {

 	activeMounts     map[string]int

 }

+func init() {

+	var err error

+

+	rawMetaSize := os.Getenv("DOCKER_LOOPBACK_META_SIZE")

+	rawDataSize := os.Getenv("DOCKER_LOOPBACK_DATA_SIZE")

+	rawBaseFSSize := os.Getenv("DOCKER_BASE_FS_SIZE")

+

+	if rawMetaSize != "" {

+		if defaultMetaDataLoopbackSize, err = strconv.ParseInt(rawMetaSize, 0, 0); err != nil {

+			panic(err)

+		}

+	}

+	if rawDataSize != "" {

+		if defaultDataLoopbackSize, err = strconv.ParseInt(rawDataSize, 0, 0); err != nil {

+			panic(err)

+		}

+	}

+	if rawBaseFSSize != "" {

+		if defaultBaseFsSize, err = strconv.ParseUint(rawBaseFSSize, 0, 0); err != nil {

+			panic(err)

+		}

+	}

+}

+

 func getDevName(name string) string {

 	return "/dev/mapper/" + name

 }

@@ -317,7 +341,7 @@ func setCloseOnExec(name string) {

 	if fileInfos != nil {

 		for _, i := range fileInfos {

 			link, _ := os.Readlink(filepath.Join("/proc/self/fd", i.Name()))

-			if link ==  name {

+			if link == name {

 				fd, err := strconv.Atoi(i.Name())

 				if err == nil {

 					syscall.CloseOnExec(fd)

@@ -327,7 +351,7 @@ func setCloseOnExec(name string) {

 	}

 }

-func (devices *DeviceSetDM) log(level int, file string, line int, dmError int, message string)  {

+func (devices *DeviceSetDM) log(level int, file string, line int, dmError int, message string) {

 	if level >= 7 {

 		return // Ignore _LOG_DEBUG

 	}

@@ -335,7 +359,6 @@ func (devices *DeviceSetDM) log(level int, file string, line int, dmError int, m

 	utils.Debugf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)

 }

-

 func (devices *DeviceSetDM) initDevmapper() error {

 	logInit(devices)

@@ -495,7 +518,6 @@ func (devices *DeviceSetDM) RemoveDevice(hash string) error {

 		return err

 	}

-

 	return devices.removeDevice(hash)

 }

@@ -530,10 +552,9 @@ func (devices *DeviceSetDM) DeactivateDevice(hash string) error {

 	}

 	utils.Debugf("DeactivateDevice %s", hash)

-	return devices.deactivateDevice(hash);

+	return devices.deactivateDevice(hash)

 }

-

 func (devices *DeviceSetDM) Shutdown() error {

 	devices.Lock()

 	defer devices.Unlock()