}
		return nil
	}
	if len(b) == 0 {
		internalLogIf(GlobalContext, fmt.Errorf("%s is empty", healingFile))
		// 'healing.bin' might be truncated
		return nil
	}
	h := newHealingTracker()
	_, err = h.UnmarshalMsg(b)
	internalLogIf(GlobalContext, err)
	return h
}

// checkODirectDiskSupport asks the disk to write some data
// with O_DIRECT support, return an error if any and return