NFS: Eliminate client_sys in favour of cl_rpcclient

Eliminate nfs_server::client_sys in favour of nfs_client::cl_rpcclient as we
only really need one per server that we're talking to since it doesn't have any
security on it.

The retransmission management variables are also moved to the common struct as
they're required to set up the cl_rpcclient connection.

The NFS2/3 client and client_acl connections are thenceforth derived by cloning
the cl_rpcclient connection and post-applying the authorisation flavour.

The code for setting up the initial common connection has been moved to
client.c as nfs_create_rpc_client().  All the NFS program definition tables are
also moved there as that's where they're now required rather than super.c.

Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 51 insertions, 171 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index e1e5eab..8558341 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -60,52 +60,6 @@
  */
 #define NFS_MAX_READAHEAD	(RPC_DEF_SLOT_TABLE - 1)
 
-/*
- * RPC cruft for NFS
- */
-static struct rpc_version * nfs_version[] = {
-	NULL,
-	NULL,
-	&nfs_version2,
-#if defined(CONFIG_NFS_V3)
-	&nfs_version3,
-#elif defined(CONFIG_NFS_V4)
-	NULL,
-#endif
-#if defined(CONFIG_NFS_V4)
-	&nfs_version4,
-#endif
-};
-
-static struct rpc_program nfs_program = {
-	.name			= "nfs",
-	.number			= NFS_PROGRAM,
-	.nrvers			= ARRAY_SIZE(nfs_version),
-	.version		= nfs_version,
-	.stats			= &nfs_rpcstat,
-	.pipe_dir_name		= "/nfs",
-};
-
-struct rpc_stat nfs_rpcstat = {
-	.program		= &nfs_program
-};
-
-
-#ifdef CONFIG_NFS_V3_ACL
-static struct rpc_stat		nfsacl_rpcstat = { &nfsacl_program };
-static struct rpc_version *	nfsacl_version[] = {
-	[3]			= &nfsacl_version3,
-};
-
-struct rpc_program		nfsacl_program = {
-	.name =			"nfsacl",
-	.number =		NFS_ACL_PROGRAM,
-	.nrvers =		ARRAY_SIZE(nfsacl_version),
-	.version =		nfsacl_version,
-	.stats =		&nfsacl_rpcstat,
-};
-#endif  /* CONFIG_NFS_V3_ACL */
-
 static void nfs_umount_begin(struct vfsmount *, int);
 static int  nfs_statfs(struct dentry *, struct kstatfs *);
 static int  nfs_show_options(struct seq_file *, struct vfsmount *);
@@ -376,8 +330,8 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 			proto = buf;
 	}
 	seq_printf(m, ",proto=%s", proto);
-	seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
-	seq_printf(m, ",retrans=%u", nfss->retrans_count);
+	seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
+	seq_printf(m, ",retrans=%u", clp->retrans_count);
 	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 }
 
@@ -622,49 +576,16 @@ out_no_root:
 }
 
 /*
- * Initialise the timeout values for a connection
- */
-static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
-{
-	to->to_initval = timeo * HZ / 10;
-	to->to_retries = retrans;
-	if (!to->to_retries)
-		to->to_retries = 2;
-
-	switch (proto) {
-	case IPPROTO_TCP:
-		if (!to->to_initval)
-			to->to_initval = 60 * HZ;
-		if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
-			to->to_initval = NFS_MAX_TCP_TIMEOUT;
-		to->to_increment = to->to_initval;
-		to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
-		to->to_exponential = 0;
-		break;
-	case IPPROTO_UDP:
-	default:
-		if (!to->to_initval)
-			to->to_initval = 11 * HZ / 10;
-		if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
-			to->to_initval = NFS_MAX_UDP_TIMEOUT;
-		to->to_maxval = NFS_MAX_UDP_TIMEOUT;
-		to->to_exponential = 1;
-		break;
-	}
-}
-
-/*
  * Create an RPC client handle.
  */
 static struct rpc_clnt *
 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
 {
 	struct nfs_client	*clp;
-	struct rpc_timeout	timeparms;
-	struct rpc_xprt		*xprt = NULL;
-	struct rpc_clnt		*clnt = NULL;
+	struct rpc_clnt		*clnt;
 	int			proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
 	int			nfsversion = 2;
+	int			err;
 
 #ifdef CONFIG_NFS_V3
 	if (server->flags & NFS_MOUNT_VER3)
@@ -677,52 +598,54 @@ nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
 		return ERR_PTR(PTR_ERR(clp));
 	}
 
-	nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
-
-	server->retrans_timeo = timeparms.to_initval;
-	server->retrans_count = timeparms.to_retries;
-
-	/* Check NFS protocol revision and initialize RPC op vector
-	 * and file handle pool. */
+	if (clp->cl_cons_state == NFS_CS_INITING) {
+		/* Check NFS protocol revision and initialize RPC op
+		 * vector and file handle pool. */
 #ifdef CONFIG_NFS_V3
-	if (nfsversion == 3) {
-		clp->rpc_ops = &nfs_v3_clientops;
-		server->caps |= NFS_CAP_READDIRPLUS;
-	} else {
-		clp->rpc_ops = &nfs_v2_clientops;
-	}
+		if (nfsversion == 3) {
+			clp->rpc_ops = &nfs_v3_clientops;
+			server->caps |= NFS_CAP_READDIRPLUS;
+		} else {
+			clp->rpc_ops = &nfs_v2_clientops;
+		}
 #else
-	clp->rpc_ops = &nfs_v2_clientops;
+		clp->rpc_ops = &nfs_v2_clientops;
 #endif
 
-	/* create transport and client */
-	xprt = xprt_create_proto(proto, &server->addr, &timeparms);
-	if (IS_ERR(xprt)) {
-		dprintk("%s: cannot create RPC transport. Error = %ld\n",
-				__FUNCTION__, PTR_ERR(xprt));
-		nfs_mark_client_ready(clp, PTR_ERR(xprt));
-		nfs_put_client(clp);
-		return (struct rpc_clnt *)xprt;
+		/* create transport and client */
+		err = nfs_create_rpc_client(clp, proto, data->timeo,
+					    data->retrans, RPC_AUTH_UNIX);
+		if (err < 0)
+			goto client_init_error;
+
+		nfs_mark_client_ready(clp, 0);
 	}
-	clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
-				 clp->cl_nfsversion, data->pseudoflavor);
+
+	/* create an nfs_server-specific client */
+	clnt = rpc_clone_client(clp->cl_rpcclient);
 	if (IS_ERR(clnt)) {
-		dprintk("%s: cannot create RPC client. Error = %ld\n",
-				__FUNCTION__, PTR_ERR(xprt));
-		goto out_fail;
+		dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
+		nfs_put_client(clp);
+		return ERR_PTR(PTR_ERR(clnt));
 	}
 
-	clnt->cl_intr     = 1;
-	clnt->cl_softrtry = 1;
+	if (data->pseudoflavor != clp->cl_rpcclient->cl_auth->au_flavor) {
+		struct rpc_auth *auth;
+
+		auth = rpcauth_create(data->pseudoflavor, server->client);
+		if (IS_ERR(auth)) {
+			dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
+			return ERR_PTR(PTR_ERR(auth));
+		}
+	}
 
-	nfs_mark_client_ready(clp, 0);
 	server->nfs_client = clp;
 	return clnt;
 
-out_fail:
-	nfs_mark_client_ready(clp, PTR_ERR(xprt));
+client_init_error:
+	nfs_mark_client_ready(clp, err);
 	nfs_put_client(clp);
-	return clnt;
+	return ERR_PTR(err);
 }
 
 /*
@@ -741,7 +664,7 @@ static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_cl
 	sb->s_blocksize_bits = data->sb->s_blocksize_bits;
 	sb->s_maxbytes = data->sb->s_maxbytes;
 
-	server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
+	server->client_acl = ERR_PTR(-EINVAL);
 	server->io_stats = nfs_alloc_iostats();
 	if (server->io_stats == NULL)
 		goto out;
@@ -750,11 +673,6 @@ static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_cl
 	if (IS_ERR((err = server->client)))
 		goto out;
 
-	if (!IS_ERR(parent->client_sys)) {
-		server->client_sys = rpc_clone_client(parent->client_sys);
-		if (IS_ERR((err = server->client_sys)))
-			goto out;
-	}
 	if (!IS_ERR(parent->client_acl)) {
 		server->client_acl = rpc_clone_client(parent->client_acl);
 		if (IS_ERR((err = server->client_acl)))
@@ -813,7 +731,7 @@ static int nfs_clone_generic_sb(struct nfs_clone_mount *data,
 		error = PTR_ERR(sb);
 		goto kill_rpciod;
 	}
-		
+
 	if (sb->s_root)
 		goto out_rpciod_down;
 
@@ -896,19 +814,6 @@ nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 		return PTR_ERR(server->client);
 
 	/* RFC 2623, sec 2.3.2 */
-	if (authflavor != RPC_AUTH_UNIX) {
-		struct rpc_auth *auth;
-
-		server->client_sys = rpc_clone_client(server->client);
-		if (IS_ERR(server->client_sys))
-			return PTR_ERR(server->client_sys);
-		auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
-		if (IS_ERR(auth))
-			return PTR_ERR(auth);
-	} else {
-		atomic_inc(&server->client->cl_count);
-		server->client_sys = server->client;
-	}
 	if (server->flags & NFS_MOUNT_VER3) {
 #ifdef CONFIG_NFS_V3_ACL
 		if (!(server->flags & NFS_MOUNT_NOACL)) {
@@ -1012,7 +917,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
 		goto out_err_noserver;
 	/* Zero out the NFS state stuff */
 	init_nfsv4_state(server);
-	server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
+	server->client = server->client_acl = ERR_PTR(-EINVAL);
 
 	root = &server->fh;
 	if (data->flags & NFS_MOUNT_VER3)
@@ -1083,8 +988,6 @@ static void nfs_kill_super(struct super_block *s)
 
 	if (!IS_ERR(server->client))
 		rpc_shutdown_client(server->client);
-	if (!IS_ERR(server->client_sys))
-		rpc_shutdown_client(server->client_sys);
 	if (!IS_ERR(server->client_acl))
 		rpc_shutdown_client(server->client_acl);
 
@@ -1121,10 +1024,9 @@ static int nfs_clone_nfs_sb(struct file_system_type *fs_type,
 
 #ifdef CONFIG_NFS_V4
 static struct rpc_clnt *nfs4_create_client(struct nfs_server *server,
-	struct rpc_timeout *timeparms, int proto, rpc_authflavor_t flavor)
+	int timeo, int retrans, int proto, rpc_authflavor_t flavor)
 {
 	struct nfs_client *clp;
-	struct rpc_xprt *xprt = NULL;
 	struct rpc_clnt *clnt = NULL;
 	int err = -EIO;
 
@@ -1138,26 +1040,10 @@ static struct rpc_clnt *nfs4_create_client(struct nfs_server *server,
 	if (clp->cl_cons_state == NFS_CS_INITING) {
 		clp->rpc_ops = &nfs_v4_clientops;
 
-		xprt = xprt_create_proto(proto, &server->addr, timeparms);
-		if (IS_ERR(xprt)) {
-			err = PTR_ERR(xprt);
-			dprintk("%s: cannot create RPC transport. Error = %d\n",
-					__FUNCTION__, err);
+		err = nfs_create_rpc_client(clp, proto, timeo, retrans, flavor);
+		if (err < 0)
 			goto client_init_error;
-		}
-		/* Bind to a reserved port! */
-		xprt->resvport = 1;
-		clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
-				clp->cl_nfsversion, flavor);
-		if (IS_ERR(clnt)) {
-			err = PTR_ERR(clnt);
-			dprintk("%s: cannot create RPC client. Error = %d\n",
-					__FUNCTION__, err);
-			goto client_init_error;
-		}
-		clnt->cl_intr     = 1;
-		clnt->cl_softrtry = 1;
-		clp->cl_rpcclient = clnt;
+
 		memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
 		err = nfs_idmap_new(clp);
 		if (err < 0) {
@@ -1205,7 +1091,6 @@ client_init_error:
 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;
 
@@ -1224,11 +1109,6 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 	server->acdirmin = data->acdirmin*HZ;
 	server->acdirmax = data->acdirmax*HZ;
 
-	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) {
@@ -1244,7 +1124,8 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 		}
 	}
 
-	server->client = nfs4_create_client(server, &timeparms, data->proto, authflavour);
+	server->client = nfs4_create_client(server, data->timeo, data->retrans,
+					    data->proto, authflavour);
 	if (IS_ERR(server->client)) {
 		err = PTR_ERR(server->client);
 			dprintk("%s: cannot create RPC client. Error = %d\n",
@@ -1318,7 +1199,7 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
 		return -ENOMEM;
 	/* Zero out the NFS state stuff */
 	init_nfsv4_state(server);
-	server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
+	server->client = server->client_acl = ERR_PTR(-EINVAL);
 
 	p = nfs_copy_user_string(NULL, &data->hostname, 256);
 	if (IS_ERR(p))
@@ -1489,7 +1370,6 @@ err:
 static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nfs_clone_mount *data)
 {
 	struct nfs_server *server = NFS_SB(sb);
-	struct rpc_timeout timeparms;
 	int proto, timeo, retrans;
 	void *err;
 
@@ -1498,11 +1378,11 @@ static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nf
 	   set the timeouts and retries to low values */
 	timeo = 2;
 	retrans = 1;
-	nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
 
 	nfs_put_client(server->nfs_client);
 	server->nfs_client = NULL;
-	server->client = nfs4_create_client(server, &timeparms, proto, data->authflavor);
+	server->client = nfs4_create_client(server, timeo, retrans, proto,
+					    data->authflavor);
 	if (IS_ERR((err = server->client)))
 		goto out_err;