static int nfs4_match_client(struct nfs_client  *pos,  struct nfs_client *new,
			     struct nfs_client **prev, struct nfs_net *nn)
{
	int status;

	if (pos->rpc_ops != new->rpc_ops)
		return 1;

	if (pos->cl_minorversion != new->cl_minorversion)
		return 1;

	/* If "pos" isn't marked ready, we can't trust the
	 * remaining fields in "pos", especially the client
	 * ID and serverowner fields.  Wait for CREATE_SESSION
	 * to finish. */
	if (pos->cl_cons_state > NFS_CS_READY) {
		refcount_inc(&pos->cl_count);
		spin_unlock(&nn->nfs_client_lock);

		nfs_put_client(*prev);
		*prev = pos;

		status = nfs_wait_client_init_complete(pos);
		spin_lock(&nn->nfs_client_lock);

		if (status < 0)
			return status;
	}

	if (pos->cl_cons_state != NFS_CS_READY)
		return 1;

	if (pos->cl_clientid != new->cl_clientid)
		return 1;

	/* NFSv4.1 always uses the uniform string, however someone
	 * might switch the uniquifier string on us.
	 */
	if (!nfs4_match_client_owner_id(pos, new))
		return 1;

	return 0;
}
static int nfs4_match_client(struct nfs_client  *pos,  struct nfs_client *new,
			     struct nfs_client **prev, struct nfs_net *nn)
{
	int status;

	if (pos->rpc_ops != new->rpc_ops)
		return 1;

	if (pos->cl_minorversion != new->cl_minorversion)
		return 1;

	 
	if (pos->cl_cons_state > NFS_CS_READY) {
		refcount_inc(&pos->cl_count);
		spin_unlock(&nn->nfs_client_lock);

		nfs_put_client(*prev);
		*prev = pos;

		status = nfs_wait_client_init_complete(pos);
		spin_lock(&nn->nfs_client_lock);

		if (status < 0)
			return status;
	}

	if (pos->cl_cons_state != NFS_CS_READY)
		return 1;

	if (pos->cl_clientid != new->cl_clientid)
		return 1;

	 
	if (!nfs4_match_client_owner_id(pos, new))
		return 1;

	return 0;
}