NFS: Clean up the logic that handles recovery from a failed mount

   request. Get rid of nfs_put_super.
Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@fys.uio.no>

fs/nfs/inode.c

@@ -57,7 +57,6 @@ static struct inode *nfs_alloc_inode(struct super_block *sb);
 static void nfs_destroy_inode(struct inode *);
 static void nfs_write_inode(struct inode *,int);
 static void nfs_delete_inode(struct inode *);
-static void nfs_put_super(struct super_block *);
 static void nfs_clear_inode(struct inode *);
 static void nfs_umount_begin(struct super_block *);
 static int  nfs_statfs(struct super_block *, struct kstatfs *);
@@ -68,7 +67,6 @@ static struct super_operations nfs_sops = {
 	.destroy_inode	= nfs_destroy_inode,
 	.write_inode	= nfs_write_inode,
 	.delete_inode	= nfs_delete_inode,
-	.put_super	= nfs_put_super,
 	.statfs		= nfs_statfs,
 	.clear_inode	= nfs_clear_inode,
 	.umount_begin	= nfs_umount_begin,
@@ -151,27 +149,6 @@ nfs_clear_inode(struct inode *inode)
 	BUG_ON(atomic_read(&nfsi->data_updates) != 0);
 }
 
-void
-nfs_put_super(struct super_block *sb)
-{
-	struct nfs_server *server = NFS_SB(sb);
-
-	nfs4_renewd_prepare_shutdown(server);
-
-	if (server->client != NULL)
-		rpc_shutdown_client(server->client);
-	if (server->client_sys != NULL)
-		rpc_shutdown_client(server->client_sys);
-
-	if (!(server->flags & NFS_MOUNT_NONLM))
-		lockd_down();	/* release rpc.lockd */
-	rpciod_down();		/* release rpciod */
-
-	destroy_nfsv4_state(server);
-
-	kfree(server->hostname);
-}
-
 void
 nfs_umount_begin(struct super_block *sb)
 {
@@ -405,7 +382,6 @@ static int
 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 {
 	struct nfs_server	*server;
-	int			err = -EIO;
 	rpc_authflavor_t	authflavor;
 
 	server           = NFS_SB(sb);
@@ -424,10 +400,14 @@ nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 	server->acdirmin = data->acdirmin*HZ;
 	server->acdirmax = data->acdirmax*HZ;
 
+	/* Start lockd here, before we might error out */
+	if (!(server->flags & NFS_MOUNT_NONLM))
+		lockd_up();
+
 	server->namelen  = data->namlen;
 	server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
 	if (!server->hostname)
-		goto out_fail;
+		return -ENOMEM;
 	strcpy(server->hostname, data->hostname);
 
 	/* Check NFS protocol revision and initialize RPC op vector
@@ -438,11 +418,11 @@ nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 		server->caps |= NFS_CAP_READDIRPLUS;
 		if (data->version < 4) {
 			printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n");
-			goto out_fail;
+			return -EIO;
 		}
 #else
 		printk(KERN_NOTICE "NFS: NFSv3 not supported.\n");
-		goto out_fail;
+		return -EIO;
 #endif
 	} else {
 		server->rpc_ops = &nfs_v2_clientops;
@@ -457,30 +437,19 @@ nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 	/* Create RPC client handles */
 	server->client = nfs_create_client(server, data);
 	if (IS_ERR(server->client))
-		goto out_fail;
+		return PTR_ERR(server->client);
 	/* RFC 2623, sec 2.3.2 */
 	if (authflavor != RPC_AUTH_UNIX) {
 		server->client_sys = rpc_clone_client(server->client);
-		if (server->client_sys == NULL)
-			goto out_shutdown;
+		if (IS_ERR(server->client_sys))
+			return PTR_ERR(server->client_sys);
 		if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys))
-			goto out_shutdown;
+			return -ENOMEM;
 	} else {
 		atomic_inc(&server->client->cl_count);
 		server->client_sys = server->client;
 	}
 
-	/* Fire up rpciod if not yet running */
-	if (rpciod_up() != 0) {
-		printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
-		goto out_shutdown;
-	}
-
-	sb->s_op = &nfs_sops;
-	err = nfs_sb_init(sb, authflavor);
-	if (err != 0)
-		goto out_noinit;
-
 	if (server->flags & NFS_MOUNT_VER3) {
 		if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
 			server->namelen = NFS3_MAXNAMLEN;
@@ -489,21 +458,8 @@ nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 			server->namelen = NFS2_MAXNAMLEN;
 	}
 
-	/* Check whether to start the lockd process */
-	if (!(server->flags & NFS_MOUNT_NONLM))
-		lockd_up();
-	return 0;
-out_noinit:
-	rpciod_down();
-out_shutdown:
-	if (server->client)
-		rpc_shutdown_client(server->client);
-	if (server->client_sys)
-		rpc_shutdown_client(server->client_sys);
-out_fail:
-	if (server->hostname)
-		kfree(server->hostname);
-	return err;
+	sb->s_op = &nfs_sops;
+	return nfs_sb_init(sb, authflavor);
 }
 
 static int
@@ -1373,6 +1329,13 @@ static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
 
 	s->s_flags = flags;
 
+	/* Fire up rpciod if not yet running */
+	if (rpciod_up() != 0) {
+		printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
+		kfree(server);
+		return ERR_PTR(-EIO);
+	}
+
 	error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
 	if (error) {
 		up_write(&s->s_umount);
@@ -1386,7 +1349,25 @@ static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
 static void nfs_kill_super(struct super_block *s)
 {
 	struct nfs_server *server = NFS_SB(s);
+
 	kill_anon_super(s);
+
+	nfs4_renewd_prepare_shutdown(server);
+
+	if (server->client != NULL && !IS_ERR(server->client))
+		rpc_shutdown_client(server->client);
+	if (server->client_sys != NULL && !IS_ERR(server->client_sys))
+		rpc_shutdown_client(server->client_sys);
+
+	if (!(server->flags & NFS_MOUNT_NONLM))
+		lockd_down();	/* release rpc.lockd */
+
+	rpciod_down();		/* release rpciod */
+
+	destroy_nfsv4_state(server);
+
+	if (server->hostname != NULL)
+		kfree(server->hostname);
 	kfree(server);
 }
 
@@ -1407,7 +1388,6 @@ static struct super_operations nfs4_sops = {
 	.destroy_inode	= nfs_destroy_inode,
 	.write_inode	= nfs_write_inode,
 	.delete_inode	= nfs_delete_inode,
-	.put_super	= nfs_put_super,
 	.statfs		= nfs_statfs,
 	.clear_inode	= nfs4_clear_inode,
 	.umount_begin	= nfs_umount_begin,
@@ -1498,7 +1478,7 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 	clp = nfs4_get_client(&server->addr.sin_addr);
 	if (!clp) {
 		printk(KERN_WARNING "NFS: failed to create NFS4 client.\n");
-		goto out_fail;
+		return -EIO;
 	}
 
 	/* Now create transport and client */
@@ -1547,45 +1527,29 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 
 	if (IS_ERR(clnt)) {
 		printk(KERN_WARNING "NFS: cannot create RPC client.\n");
-		err = PTR_ERR(clnt);
-		goto out_remove_list;
+		return PTR_ERR(clnt);
 	}
 
 	clnt->cl_intr     = (server->flags & NFS4_MOUNT_INTR) ? 1 : 0;
 	clnt->cl_softrtry = (server->flags & NFS4_MOUNT_SOFT) ? 1 : 0;
 	server->client    = clnt;
 
-	err = -ENOMEM;
 	if (server->nfs4_state->cl_idmap == NULL) {
 		printk(KERN_WARNING "NFS: failed to create idmapper.\n");
-		goto out_shutdown;
+		return -ENOMEM;
 	}
 
 	if (clnt->cl_auth->au_flavor != authflavour) {
 		if (rpcauth_create(authflavour, clnt) == NULL) {
 			printk(KERN_WARNING "NFS: couldn't create credcache!\n");
-			goto out_shutdown;
+			return -ENOMEM;
 		}
 	}
 
-	/* Fire up rpciod if not yet running */
-	if (rpciod_up() != 0) {
-		printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
-		goto out_shutdown;
-	}
-
 	sb->s_op = &nfs4_sops;
 	err = nfs_sb_init(sb, authflavour);
 	if (err == 0)
 		return 0;
-	rpciod_down();
-out_shutdown:
-	rpc_shutdown_client(server->client);
-out_remove_list:
-	down_write(&server->nfs4_state->cl_sem);
-	list_del_init(&server->nfs4_siblings);
-	up_write(&server->nfs4_state->cl_sem);
-	destroy_nfsv4_state(server);
 out_fail:
 	if (clp)
 		nfs4_put_client(clp);
@@ -1691,6 +1655,13 @@ static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
 
 	s->s_flags = flags;
 
+	/* Fire up rpciod if not yet running */
+	if (rpciod_up() != 0) {
+		printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
+		s = ERR_PTR(-EIO);
+		goto out_free;
+	}
+
 	error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
 	if (error) {
 		up_write(&s->s_umount);