@@ -1,21 +1,22 @@

 package zfs

 import (

-	"fmt"

-

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

 	"github.com/sirupsen/logrus"

-	"golang.org/x/sys/unix"

 )

-func checkRootdirFs(rootdir string) error {

-	var buf unix.Statfs_t

-	if err := unix.Statfs(rootdir, &buf); err != nil {

-		return fmt.Errorf("Failed to access '%s': %s", rootdir, err)

+func checkRootdirFs(rootDir string) error {

+	fsMagic, err := graphdriver.GetFSMagic(rootDir)

+	if err != nil {

+		return err

+	}

+	backingFS := "unknown"

+	if fsName, ok := graphdriver.FsNames[fsMagic]; ok {

+		backingFS = fsName

 	}

-	if graphdriver.FsMagic(buf.Type) != graphdriver.FsMagicZfs {

-		logrus.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir)

+	if fsMagic != graphdriver.FsMagicZfs {

+		logrus.WithField("root", rootDir).WithField("backingFS", backingFS).WithField("driver", "zfs").Error("No zfs dataset found for root")

 		return graphdriver.ErrPrerequisites

 	}