case osIsPermission(err):
			return nil, errDiskAccessDenied
		case isSysErrIO(err):
			return nil, errFaultyDisk
		case isSysErrNotDir(err):
			return nil, errDiskNotDir
		case os.IsNotExist(err):
			return nil, errDiskNotFound
		}
	}

	return w, nil
}

func (s *xlStorage) openFileSync(filePath string, mode int, skipParent string) (f *os.File, err error) {