int nfs4_update_server(struct nfs_server *server, const char *hostname,
		       struct sockaddr *sap, size_t salen, struct net *net)
{
	struct nfs_client *clp = server->nfs_client;
	struct rpc_clnt *clnt = server->client;
	struct xprt_create xargs = {
		.ident		= clp->cl_proto,
		.net		= net,
		.dstaddr	= sap,
		.addrlen	= salen,
		.servername	= hostname,
	};
	char buf[INET6_ADDRSTRLEN + 1];
	struct sockaddr_storage address;
	struct sockaddr *localaddr = (struct sockaddr *)&address;
	int error;

	error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
	if (error != 0)
		return error;

	error = rpc_localaddr(clnt, localaddr, sizeof(address));
	if (error != 0)
		return error;

	if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
		return -EAFNOSUPPORT;

	nfs_server_remove_lists(server);
	set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
	error = nfs4_set_client(server, hostname, sap, salen, buf,
				clp->cl_proto, clnt->cl_timeout,
				clp->cl_minorversion,
				clp->cl_nconnect, net);
	clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
	if (error != 0) {
		nfs_server_insert_lists(server);
		return error;
	}
	nfs_put_client(clp);

	if (server->nfs_client->cl_hostname == NULL)
		server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
	nfs_server_insert_lists(server);

	return nfs_probe_destination(server);
}
int nfs4_update_server(struct nfs_server *server, const char *hostname,
		       struct sockaddr *sap, size_t salen, struct net *net)
{
	struct nfs_client *clp = server->nfs_client;
	struct rpc_clnt *clnt = server->client;
	struct xprt_create xargs = {
		.ident		= clp->cl_proto,
		.net		= net,
		.dstaddr	= sap,
		.addrlen	= salen,
		.servername	= hostname,
	};
	char buf[INET6_ADDRSTRLEN + 1];
	struct sockaddr_storage address;
	struct sockaddr *localaddr = (struct sockaddr *)&address;
	int error;

	error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
	if (error != 0)
		return error;

	error = rpc_localaddr(clnt, localaddr, sizeof(address));
	if (error != 0)
		return error;

	if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
		return -EAFNOSUPPORT;

	nfs_server_remove_lists(server);
	set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
	error = nfs4_set_client(server, hostname, sap, salen, buf,
				clp->cl_proto, clnt->cl_timeout,
				clp->cl_minorversion,
				clp->cl_nconnect, net);
	clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
	if (error != 0) {
		nfs_server_insert_lists(server);
		return error;
	}
	nfs_put_client(clp);

	if (server->nfs_client->cl_hostname == NULL)
		server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
	nfs_server_insert_lists(server);

	return nfs_probe_destination(server);
}