if !dstOpts.NoAuditLog {
		auditObjectErasureSet(ctx, "CopyObject", 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
		}

		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 {

		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.readAllDataWithDMTime(ctx, req.Bucket, volumeDir, fullPath)
			}
			return err
		}); err != nil {