// Setup test environment.
	if err = xlStorage.MakeVol(t.Context(), "success-vol"); err != nil {
		t.Fatalf("Unable to create volume, %s", err)
	}

	// TestXLStorage failure cases.
	vol := slashpath.Join(path, "nonempty-vol")
	if err = os.Mkdir(vol, 0o777); err != nil {
		t.Fatalf("Unable to create directory, %s", err)
	}
	if err = os.WriteFile(slashpath.Join(vol, "test-file"), []byte{}, os.ModePerm); err != nil {

    while (values.hasNext()) {
      double value = values.next().doubleValue();
      count++;
      if (isFinite(value) && isFinite(mean)) {
        // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
        mean += (value - mean) / count;
      } else {
        mean = calculateNewMeanNonFinite(mean, value);
      }
    }
    return mean;
  }

  /**

func (client *storageRESTClient) StatVol(ctx context.Context, volume string) (vol VolInfo, err error) {
	v, err := storageStatVolRPC.Call(ctx, client.gridConn, grid.NewMSSWith(map[string]string{
		storageRESTDiskID: *client.diskID.Load(),
		storageRESTVolume: volume,
	}))
	if err != nil {
		return vol, toStorageErr(err)
	}
	vol = *v
	// Performs shallow copy, so we can reuse.
	storageStatVolRPC.PutResponse(v)

  /** Adds the given pair of values to the dataset. */
  public void add(double x, double y) {
    // We extend the recursive expression for the one-variable case at Art of Computer Programming
    // vol. 2, Knuth, 4.2.2, (16) to the two-variable case. We have two value series x_i and y_i.
    // We define the arithmetic means X_n = 1/n \sum_{i=1}^n x_i, and Y_n = 1/n \sum_{i=1}^n y_i.

        int di = 0;
        for (;;) {
            /* NTLM HTTP Authentication must be re-negotiated
             * with challenge from 'server' to access DFS vol. */
            dr.resolveHashes = auth.hashesExternal;
            dr.ttl = resp.referrals[di].ttl;
            dr.expiration = expiration;
            if (path.equals("")) {

type SRBucketDeleteOp string

const (
	// MarkDelete creates .minio.sys/buckets/.deleted/<bucket> vol entry to hold onto deleted bucket's state
	// until peers are synced in site replication setup.
	MarkDelete SRBucketDeleteOp = "MarkDelete"

	// Purge deletes the .minio.sys/buckets/.deleted/<bucket> vol entry
	Purge SRBucketDeleteOp = "Purge"
	// NoOp no action needed
	NoOp SRBucketDeleteOp = "NoOp"
)

		}
		volsInfo = append(volsInfo, VolInfo{
			Name: pathutil.Clean(entry),
		})
	}
	return volsInfo, nil
}

// StatVol - get volume info.
func (s *xlStorage) StatVol(ctx context.Context, volume string) (vol VolInfo, err error) {
	// Verify if volume is valid and it exists.
	volumeDir, err := s.getVolDir(volume)
	if err != nil {
		return VolInfo{}, err
	}

	// Stat a volume entry.
	var st os.FileInfo

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