Function newFlakeyDevice

tests/dmflakey/dmsetup.go:18–36

newFlakeyDevice creates flakey device. REF: https://docs.kernel.org/admin-guide/device-mapper/dm-flakey.html

(flakeyDevice, loopDevice string, interval time.Duration)

//
// REF: https://docs.kernel.org/admin-guide/device-mapper/dm-flakey.html
func newFlakeyDevice(flakeyDevice, loopDevice string, interval time.Duration) error {
	loopSize, err := getBlkSize(loopDevice)
	if err != nil {
		return fmt.Errorf("failed to get the size of the loop device %s: %w", loopDevice, err)
	}

	// The flakey device will be available in interval.Seconds().
	table := fmt.Sprintf("0 %d flakey %s 0 %d 0",
		loopSize, loopDevice, int(interval.Seconds()))

	args := []string{"create", flakeyDevice, "--table", table}

	output, err := exec.Command("dmsetup", args...).CombinedOutput()
	if err != nil {
		return fmt.Errorf("failed to create flakey device %s with table %s (out: %s): %w",
			flakeyDevice, table, string(output), err)
	}
	return nil
}

// reloadFlakeyDevice reloads the flakey device with feature table.
func reloadFlakeyDevice(flakeyDevice string, syncFS bool, table string) (retErr error) {