Function FsError

fs/fserrors/error.go:344–349

FsError makes an error which can keep a record that it is already counted or not

(err error)

// FsError makes an error which can keep a record that it is already counted
// or not
func FsError(err error) error {
	if err == nil {
		err = errors.New("countable error")
	}
	return &wrappedCountableError{error: err}
}

// Cause is a souped up errors.Cause which can unwrap some standard
// library errors too.  It returns true if any of the intermediate