@@ -17,6 +17,7 @@ import (

 	"syscall"

 	"time"

+	"github.com/dotcloud/docker/daemon/graphdriver"

 	"github.com/dotcloud/docker/pkg/label"

 	"github.com/dotcloud/docker/utils"

 )

@@ -506,6 +507,12 @@ func (devices *DeviceSet) ResizePool(size int64) error {

 func (devices *DeviceSet) initDevmapper(doInit bool) error {

 	logInit(devices)

+	_, err := getDriverVersion()

+	if err != nil {

+		// Can't even get driver version, assume not supported

+		return graphdriver.ErrNotSupported

+	}

+

 	if err := os.MkdirAll(devices.metadataDir(), 0700); err != nil && !os.IsExist(err) {

 		return err

 	}

@@ -52,6 +52,7 @@ var (

 	ErrTaskAddTarget          = errors.New("dm_task_add_target failed")

 	ErrTaskSetSector          = errors.New("dm_task_set_sector failed")

 	ErrTaskGetInfo            = errors.New("dm_task_get_info failed")

+	ErrTaskGetDriverVersion   = errors.New("dm_task_get_driver_version failed")

 	ErrTaskSetCookie          = errors.New("dm_task_set_cookie failed")

 	ErrNilCookie              = errors.New("cookie ptr can't be nil")

 	ErrAttachLoopbackDevice   = errors.New("loopback mounting failed")

@@ -178,6 +179,14 @@ func (t *Task) GetInfo() (*Info, error) {

 	return info, nil

 }

+func (t *Task) GetDriverVersion() (string, error) {

+	res := DmTaskGetDriverVersion(t.unmanaged)

+	if res == "" {

+		return "", ErrTaskGetDriverVersion

+	}

+	return res, nil

+}

+

 func (t *Task) GetNextTarget(next uintptr) (nextPtr uintptr, start uint64,

 	length uint64, targetType string, params string) {

@@ -394,6 +403,17 @@ func getInfo(name string) (*Info, error) {

 	return task.GetInfo()

 }

+func getDriverVersion() (string, error) {

+	task := TaskCreate(DeviceVersion)

+	if task == nil {

+		return "", fmt.Errorf("Can't create DeviceVersion task")

+	}

+	if err := task.Run(); err != nil {

+		return "", err

+	}

+	return task.GetDriverVersion()

+}

+

 func getStatus(name string) (uint64, uint64, string, string, error) {

 	task, err := createTask(DeviceStatus, name)

 	if task == nil {

@@ -85,23 +85,24 @@ const (

 )

 var (

-	DmGetLibraryVersion = dmGetLibraryVersionFct

-	DmGetNextTarget     = dmGetNextTargetFct

-	DmLogInitVerbose    = dmLogInitVerboseFct

-	DmSetDevDir         = dmSetDevDirFct

-	DmTaskAddTarget     = dmTaskAddTargetFct

-	DmTaskCreate        = dmTaskCreateFct

-	DmTaskDestroy       = dmTaskDestroyFct

-	DmTaskGetInfo       = dmTaskGetInfoFct

-	DmTaskRun           = dmTaskRunFct

-	DmTaskSetAddNode    = dmTaskSetAddNodeFct

-	DmTaskSetCookie     = dmTaskSetCookieFct

-	DmTaskSetMessage    = dmTaskSetMessageFct

-	DmTaskSetName       = dmTaskSetNameFct

-	DmTaskSetRo         = dmTaskSetRoFct

-	DmTaskSetSector     = dmTaskSetSectorFct

-	DmUdevWait          = dmUdevWaitFct

-	LogWithErrnoInit    = logWithErrnoInitFct

+	DmGetLibraryVersion    = dmGetLibraryVersionFct

+	DmGetNextTarget        = dmGetNextTargetFct

+	DmLogInitVerbose       = dmLogInitVerboseFct

+	DmSetDevDir            = dmSetDevDirFct

+	DmTaskAddTarget        = dmTaskAddTargetFct

+	DmTaskCreate           = dmTaskCreateFct

+	DmTaskDestroy          = dmTaskDestroyFct

+	DmTaskGetInfo          = dmTaskGetInfoFct

+	DmTaskGetDriverVersion = dmTaskGetDriverVersionFct

+	DmTaskRun              = dmTaskRunFct

+	DmTaskSetAddNode       = dmTaskSetAddNodeFct

+	DmTaskSetCookie        = dmTaskSetCookieFct

+	DmTaskSetMessage       = dmTaskSetMessageFct

+	DmTaskSetName          = dmTaskSetNameFct

+	DmTaskSetRo            = dmTaskSetRoFct

+	DmTaskSetSector        = dmTaskSetSectorFct

+	DmUdevWait             = dmUdevWaitFct

+	LogWithErrnoInit       = logWithErrnoInitFct

 )

 func free(p *C.char) {

@@ -184,6 +185,16 @@ func dmTaskGetInfoFct(task *CDmTask, info *Info) int {

 	return int(C.dm_task_get_info((*C.struct_dm_task)(task), &Cinfo))

 }

+func dmTaskGetDriverVersionFct(task *CDmTask) string {

+	buffer := C.malloc(128)

+	defer C.free(buffer)

+	res := C.dm_task_get_driver_version((*C.struct_dm_task)(task), (*C.char)(buffer), 128)

+	if res == 0 {

+		return ""

+	}

+	return C.GoString((*C.char)(buffer))

+}

+

 func dmGetNextTargetFct(task *CDmTask, next uintptr, start, length *uint64, target, params *string) uintptr {

 	var (

 		Cstart, Clength      C.uint64_t