ID_BITMAP_NONE
if (mddev->bitmap_id == ID_BITMAP_NONE)
mddev->bitmap_id = ID_BITMAP_NONE;
if (id == ID_BITMAP_NONE) {
if (mddev->bitmap_id == ID_BITMAP_NONE)
if (mddev->bitmap_id == ID_BITMAP_NONE ||
mddev->bitmap_id = ID_BITMAP_NONE;