ExpETag:    "<nil>",
						GotETag:    err.Error(),
					}
				}
			}
			checksumCombined = append(checksumCombined, cs.Raw...)
		}

		// All parts except the last part has to be at least 5MB.
		if (i < len(parts)-1) && !isMinAllowedPartSize(currentFI.Parts[partIdx].ActualSize) {
			return oi, PartTooSmall{
				PartNumber: part.PartNumber,
				PartSize:   expPart.ActualSize,

	for i := range onlineMeta {
		// verify metadata is valid, it has similar erasure info
		// as well as common modtime, if modtime is not possible
		// verify if it has common "etag" at least.
		if onlineMeta[i].IsValid() && onlineMeta[i].Erasure.Equal(fi.Erasure) {
			ok := onlineMeta[i].ModTime.Equal(modTime)
			if modTime.IsZero() || modTime.Equal(timeSentinel) {