Parts:                      o.Parts,
		Writer:                     o.Writer,
		Reader:                     o.Reader,
		PutObjReader:               o.PutObjReader,
		metadataOnly:               o.metadataOnly,
		versionOnly:                o.versionOnly,
		keyRotation:                o.keyRotation,
		AccTime:                    o.AccTime,
		Legacy:                     o.Legacy,

	// this changes for encryption which can be observed below.
	if cpSrcDstSame {
		srcInfo.metadataOnly = true
	}

	var chStorageClass bool
	if dstSc != "" && dstSc != srcInfo.StorageClass {
		chStorageClass = true
		srcInfo.metadataOnly = false
	} // no changes in storage-class expected so its a metadataonly operation.

	var reader io.Reader = gr

		case "MaxSize":
			z.MaxSize, err = dc.ReadInt64()
			if err != nil {
				err = msgp.WrapError(err, "MaxSize")
				return
			}
		case "MetadataOnly":
			z.MetadataOnly, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "MetadataOnly")
				return
			}
		case "AbortOn404":
			z.AbortOn404, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "AbortOn404")

	req := ReadMultipleReq{
		Bucket:       minioMetaMultipartBucket,
		Prefix:       partPath,
		MaxSize:      1 << 20, // Each part should realistically not be > 1MiB.
		MaxResults:   maxParts + 1,
		MetadataOnly: true,
	}

	start := partNumberMarker + 1
	end := start + maxParts

	// Parts are 1 based, so index 0 is part one, etc.
	for i := start; i <= end; i++ {

	}
	if err = rotateKey(ctx, []byte{}, newKeyID, []byte{}, r.Bucket, oi.Name, encMetadata, newKeyContext); err != nil {
		return err
	}

	// Since we are rotating the keys, make sure to update the metadata.
	oi.metadataOnly = true
	oi.keyRotation = true
	for k, v := range encMetadata {
		oi.UserDefined[k] = v
	}
	if _, err := api.CopyObject(ctx, r.Bucket, oi.Name, r.Bucket, oi.Name, oi, ObjectOptions{
		VersionID: oi.VersionID,

	Prefix       string   // Shared prefix of all files. Can be empty. Will be joined to filename without modification.
	Files        []string // Individual files to read.
	MaxSize      int64    // Return error if size is exceed.
	MetadataOnly bool     // Read as XL meta and truncate data.
	AbortOn404   bool     // Stop reading after first file not found.
	MaxResults   int      // Stop after this many successful results. <= 0 means all.
}

	srcSet := s.getHashedSet(srcObject)
	dstSet := s.getHashedSet(dstObject)

	cpSrcDstSame := srcSet == dstSet
	// Check if this request is only metadata update.
	if cpSrcDstSame && srcInfo.metadataOnly {
		// Version ID is set for the destination and source == destination version ID.
		// perform an in-place update.
		if dstOpts.VersionID != "" && srcOpts.VersionID == dstOpts.VersionID {

	if !dstOpts.NoAuditLog {
		auditObjectErasureSet(ctx, dstObject, &er)
	}

	// This call shouldn't be used for anything other than metadata updates or adding self referential versions.
	if !srcInfo.metadataOnly {
		return oi, NotImplemented{}
	}

	if !dstOpts.NoLock {
		lk := er.NewNSLock(dstBucket, dstObject)
		lkctx, err := lk.GetLock(ctx, globalOperationTimeout)
		if err != nil {
			return oi, err
		}

		}
		var data []byte
		var mt time.Time
		fullPath := pathJoin(volumeDir, req.Prefix, f)
		w := xioutil.NewDeadlineWorker(globalDriveConfig.GetMaxTimeout())
		if err := w.Run(func() (err error) {
			if req.MetadataOnly {
				data, mt, err = s.readMetadataWithDMTime(ctx, fullPath)
			} else {
				data, mt, err = s.readAllData(ctx, req.Bucket, volumeDir, fullPath, true)
			}
			return err
		}); err != nil {

		dstOpts.NoLock = true
	}

	poolIdx, err := z.getPoolIdxNoLock(ctx, dstBucket, dstObject, srcInfo.Size)
	if err != nil {
		return objInfo, err
	}

	if cpSrcDstSame && srcInfo.metadataOnly {
		// Version ID is set for the destination and source == destination version ID.
		if dstOpts.VersionID != "" && srcOpts.VersionID == dstOpts.VersionID {