NFSv4: Create NFSv4 transport and client

Move existing code into a separate function so that it can be also used by
referral code.
Signed-off-by: Manoj Naik <manoj@almaden.ibm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/inode.c

@@ -2027,62 +2027,24 @@ static void nfs4_clear_inode(struct inode *inode)
 }
 
 
-static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
+static struct rpc_clnt *nfs4_create_client(struct nfs_server *server,
+	struct rpc_timeout *timeparms, int proto, rpc_authflavor_t flavor)
 {
-	struct nfs_server *server;
-	struct nfs4_client *clp = NULL;
+	struct nfs4_client *clp;
 	struct rpc_xprt *xprt = NULL;
 	struct rpc_clnt *clnt = NULL;
-	struct rpc_timeout timeparms;
-	rpc_authflavor_t authflavour;
 	int err = -EIO;
 
-	sb->s_blocksize_bits = 0;
-	sb->s_blocksize = 0;
-	server = NFS_SB(sb);
-	if (data->rsize != 0)
-		server->rsize = nfs_block_size(data->rsize, NULL);
-	if (data->wsize != 0)
-		server->wsize = nfs_block_size(data->wsize, NULL);
-	server->flags = data->flags & NFS_MOUNT_FLAGMASK;
-	server->caps = NFS_CAP_ATOMIC_OPEN;
-
-	server->acregmin = data->acregmin*HZ;
-	server->acregmax = data->acregmax*HZ;
-	server->acdirmin = data->acdirmin*HZ;
-	server->acdirmax = data->acdirmax*HZ;
-
-	server->rpc_ops = &nfs_v4_clientops;
-
-	nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
-
-	server->retrans_timeo = timeparms.to_initval;
-	server->retrans_count = timeparms.to_retries;
-
 	clp = nfs4_get_client(&server->addr.sin_addr);
 	if (!clp) {
 		dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
-		return -EIO;
+		return ERR_PTR(err);
 	}
 
 	/* Now create transport and client */
-	authflavour = RPC_AUTH_UNIX;
-	if (data->auth_flavourlen != 0) {
-		if (data->auth_flavourlen != 1) {
-			dprintk("%s: Invalid number of RPC auth flavours %d.\n",
-					__FUNCTION__, data->auth_flavourlen);
-			err = -EINVAL;
-			goto out_fail;
-		}
-		if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
-			err = -EFAULT;
-			goto out_fail;
-		}
-	}
-
 	down_write(&clp->cl_sem);
 	if (IS_ERR(clp->cl_rpcclient)) {
-		xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
+		xprt = xprt_create_proto(proto, &server->addr, timeparms);
 		if (IS_ERR(xprt)) {
 			up_write(&clp->cl_sem);
 			err = PTR_ERR(xprt);
@@ -2091,7 +2053,7 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 			goto out_fail;
 		}
 		clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
-				server->rpc_ops->version, authflavour);
+				server->rpc_ops->version, flavor);
 		if (IS_ERR(clnt)) {
 			up_write(&clp->cl_sem);
 			err = PTR_ERR(clnt);
@@ -2108,43 +2070,96 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 	list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
 	clnt = rpc_clone_client(clp->cl_rpcclient);
 	if (!IS_ERR(clnt))
-			server->nfs4_state = clp;
+		server->nfs4_state = clp;
 	up_write(&clp->cl_sem);
 	clp = NULL;
 
 	if (IS_ERR(clnt)) {
-		err = PTR_ERR(clnt);
 		dprintk("%s: cannot create RPC client. Error = %d\n",
 				__FUNCTION__, err);
-		return err;
+		return clnt;
 	}
 
-	server->client    = clnt;
-
 	if (server->nfs4_state->cl_idmap == NULL) {
 		dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 	}
 
-	if (clnt->cl_auth->au_flavor != authflavour) {
+	if (clnt->cl_auth->au_flavor != flavor) {
 		struct rpc_auth *auth;
 
-		auth = rpcauth_create(authflavour, clnt);
+		auth = rpcauth_create(flavor, clnt);
 		if (IS_ERR(auth)) {
 			dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
-			return PTR_ERR(auth);
+			return (struct rpc_clnt *)auth;
+		}
+	}
+	return clnt;
+
+ out_fail:
+	if (clp)
+		nfs4_put_client(clp);
+	return ERR_PTR(err);
+}
+
+static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
+{
+	struct nfs_server *server;
+	struct rpc_timeout timeparms;
+	rpc_authflavor_t authflavour;
+	int err = -EIO;
+
+	sb->s_blocksize_bits = 0;
+	sb->s_blocksize = 0;
+	server = NFS_SB(sb);
+	if (data->rsize != 0)
+		server->rsize = nfs_block_size(data->rsize, NULL);
+	if (data->wsize != 0)
+		server->wsize = nfs_block_size(data->wsize, NULL);
+	server->flags = data->flags & NFS_MOUNT_FLAGMASK;
+	server->caps = NFS_CAP_ATOMIC_OPEN;
+
+	server->acregmin = data->acregmin*HZ;
+	server->acregmax = data->acregmax*HZ;
+	server->acdirmin = data->acdirmin*HZ;
+	server->acdirmax = data->acdirmax*HZ;
+
+	server->rpc_ops = &nfs_v4_clientops;
+
+	nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
+
+	server->retrans_timeo = timeparms.to_initval;
+	server->retrans_count = timeparms.to_retries;
+
+	/* Now create transport and client */
+	authflavour = RPC_AUTH_UNIX;
+	if (data->auth_flavourlen != 0) {
+		if (data->auth_flavourlen != 1) {
+			dprintk("%s: Invalid number of RPC auth flavours %d.\n",
+					__FUNCTION__, data->auth_flavourlen);
+			err = -EINVAL;
+			goto out_fail;
+		}
+		if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
+			err = -EFAULT;
+			goto out_fail;
 		}
 	}
 
+	server->client = nfs4_create_client(server, &timeparms, data->proto, authflavour);
+	if (IS_ERR(server->client)) {
+		err = PTR_ERR(server->client);
+			dprintk("%s: cannot create RPC client. Error = %d\n",
+					__FUNCTION__, err);
+			goto out_fail;
+	}
+
 	sb->s_time_gran = 1;
 
 	sb->s_op = &nfs4_sops;
 	err = nfs_sb_init(sb, authflavour);
-	if (err == 0)
-		return 0;
-out_fail:
-	if (clp)
-		nfs4_put_client(clp);
+
+ out_fail:
 	return err;
 }