@@ -88,6 +88,10 @@ func (devices *DeviceSetDM) hasImage(name string) bool {

 	return err == nil

 }

+// ensureImage creates a sparse file of <size> bytes at the path

+// <root>/devicemapper/<name>.

+// If the file already exists, it does nothing.

+// Either way it returns the full path.

 func (devices *DeviceSetDM) ensureImage(name string, size int64) (string, error) {

 	dirname := devices.loopbackDir()

 	filename := path.Join(dirname, name)

@@ -18,6 +18,7 @@ package devmapper

 #define LOOP_CTL_GET_FREE       0x4C82

 #endif

+// FIXME: this could easily be rewritten in go

 char*			attach_loop_device(const char *filename, int *loop_fd_out)

 {

   struct loop_info64	loopinfo = {0};

@@ -441,6 +442,7 @@ func free(p *C.char) {

 	C.free(unsafe.Pointer(p))

 }

+// This is the programmatic example of "dmsetup create"

 func createPool(poolName string, dataFile *os.File, metadataFile *os.File) error {

 	task, err := createTask(DeviceCreate, poolName)

 	if task == nil {