var (
		uv   uuid.UUID
		ddir uuid.UUID
		err  error
	)
	if versionID == nullVersionID {
		versionID = ""
	}
	if versionID != "" {
		uv, err = uuid.Parse(versionID)
		if err != nil {
			return 0
		}
	}
	ddir, err = uuid.Parse(dataDir)
	if err != nil {
		return 0
	}
	return x.SharedDataDirCount(uv, ddir)
}

				if err != nil {
					err = msgp.WrapError(err, "ObjectV2")
					return
				}
				z.ObjectV2 = nil
			} else {
				if z.ObjectV2 == nil {
					z.ObjectV2 = new(struct {
						DataDir [16]byte `msg:"DDir"`
					})
				}
				var zb0002 uint32
				zb0002, err = dc.ReadMapHeader()
				if err != nil {
					err = msgp.WrapError(err, "ObjectV2")
					return
				}
				for zb0002 > 0 {
					zb0002--