@@ -4,12 +4,12 @@ package overlay

 import (

 	"fmt"

-	"io"

 	"os"

 	"path/filepath"

 	"syscall"

 	"time"

+	"github.com/docker/docker/pkg/pools"

 	"github.com/docker/docker/pkg/system"

 )

@@ -32,7 +32,7 @@ func copyRegular(srcPath, dstPath string, mode os.FileMode) error {

 	}

 	defer dstFile.Close()

-	_, err = io.Copy(dstFile, srcFile)

+	_, err = pools.Copy(dstFile, srcFile)

 	return err

 }