if r.Method != http.MethodPut {
		return false
	}
	// If the object doesn't have a modtime (IsZero), or the modtime
	// is obviously garbage (Unix time == 0), then ignore modtimes
	// and don't process the If-Modified-Since header.
	if objInfo.ModTime.IsZero() || objInfo.ModTime.Equal(time.Unix(0, 0)) {
		return false
	}

	// Headers to be set of object content is not going to be written to the client.

	// Reduce list of UUIDs to a single common value.
	modTime = commonTime(modTimes, quorum)

	if modTime.IsZero() || modTime.Equal(timeSentinel) {
		etags := listObjectETags(partsMetadata, errs, quorum)

		etag = commonETag(etags, quorum)

		if etag != "" { // allow this fallback only if a non-empty etag is found.
			for index, e := range etags {

					VersionID: [16]byte{},
					ModTime:   baseTime.Add(60 * time.Minute).UnixNano(),
					Signature: [4]byte{5, 1, 1, 1},
					Type:      ObjectType,
					Flags:     0,
				}},
			},
		},
		// Zero version, modtime newer..
		6: {
			versions: []xlMetaV2ShallowVersion{
				{header: xlMetaV2VersionHeader{
					VersionID: [16]byte{},
					ModTime:   baseTime.Add(90 * time.Minute).UnixNano(),

			if modTime.IsZero() {
				wait := deleteMultipartCleanupSleeper.Timer(ctx)
				fi, err := disk.ReadVersion(ctx, "", minioMetaMultipartBucket, uploadIDPath, "", ReadOptions{})
				if err != nil {
					return nil
				}
				modTime = fi.ModTime
				wait()
			}
			if time.Since(modTime) < globalAPIConfig.getStaleUploadsExpiry() {
				return nil
			}

	}
	xl := xlMetaV2{}
	var versions []FileInfo
	var allVersionIDs, freeVersionIDs []string
	for i := range 5 {
		fi := basefi
		fi.VersionID = mustGetUUID()
		fi.DataDir = mustGetUUID()
		fi.ModTime = basefi.ModTime.Add(time.Duration(i) * time.Second)
		if err := xl.AddVersion(fi); err != nil {
			t.Fatalf("%d: Failed to add version %v", i+1, err)
		}

		if i > 3 {
			// Simulate transition of a version

// Returns false on ties.
func (x xlMetaV2VersionHeader) sortsBefore(o xlMetaV2VersionHeader) bool {
	if x == o {
		return false
	}
	// Prefer newest modtime.
	if x.ModTime != o.ModTime {
		return x.ModTime > o.ModTime
	}

	// The following doesn't make too much sense, but we want sort to be consistent nonetheless.
	// Prefer lower types
	if x.Type != o.Type {
		return x.Type < o.Type
	}

	modTime := commonTime(modTimes, expectedRQuorum)

	if modTime.IsZero() || modTime.Equal(timeSentinel) {
		return FileInfo{}, errErasureReadQuorum
	}

	// Iterate through all the modTimes and count the FileInfo(s) with latest time.
	for index, t := range modTimes {
		if partsMetadata[index].IsValid() && t.Equal(modTime) {
			latestFileInfo = partsMetadata[index]
			count++
		}

	}{
		{
			fis:            getNFInfo(16, 16, 1603863445, "36a21454-a2ca-11eb-bbaa-93a81c686f21", nil, nil),
			modTime:        time.Unix(1603863445, 0),
			expectedErr:    nil,
			expectedQuorum: 8,
		},
		{
			fis:            getNFInfo(16, 7, 1603863445, "36a21454-a2ca-11eb-bbaa-93a81c686f21", nil, nil),
			modTime:        time.Unix(1603863445, 0),
			expectedErr:    InsufficientReadQuorum{},
			expectedQuorum: 8,
		},
		{

	/*
		objInfos:
		version stack for obj-1
		v5 uuid-5 modTime
		v4 uuid-4 modTime -1m
		v3 uuid-3 modTime -2m
		v2 uuid-2 modTime -3m
		v1 uuid-1 modTime -4m
	*/
	for i := range 5 {
		fivs[i] = FileInfo{
			Volume:      bucket,
			Name:        obj,
			VersionID:   uuids[i].String(),
			IsLatest:    i == 0,
			ModTime:     modTime.Add(-1 * time.Duration(i) * time.Minute),
			Size:        1 << 10,

}

// StatInfo - carries stat information of the object.
type StatInfo struct {
	Size    int64     `json:"size"`    // Size of the object `xl.meta`.
	ModTime time.Time `json:"modTime"` // ModTime of the object `xl.meta`.
	Name    string    `json:"name"`
	Dir     bool      `json:"dir"`
	Mode    uint32    `json:"mode"`
}

// ErasureInfo holds erasure coding and bitrot related information.