X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fsunrpc%2Fclnt.c;h=13a3718e7cc9026dcc0c6e52e0a15cd9732b07ba;hb=0204774191d3e7bc69e3ae6bbf328b635607505a;hp=b36797ad8083166c2c0f966ed38f506468794f8d;hpb=5ee0ed7d3ab620a764740fb018f469d45f561931;p=safe%2Fjmp%2Flinux-2.6

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index b36797a..13a3718 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1,5 +1,5 @@
 /*
- *  linux/net/sunrpc/rpcclnt.c
+ *  linux/net/sunrpc/clnt.c
  *
  *  This file contains the high-level RPC interface.
  *  It is modeled as a finite state machine to support both synchronous
@@ -27,22 +27,30 @@
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/in.h>
+#include <linux/smp_lock.h>
 #include <linux/utsname.h>
+#include <linux/workqueue.h>
+#include <linux/in6.h>
 
 #include <linux/sunrpc/clnt.h>
-#include <linux/workqueue.h>
 #include <linux/sunrpc/rpc_pipe_fs.h>
-
-#include <linux/nfs.h>
+#include <linux/sunrpc/metrics.h>
 
 
-#define RPC_SLACK_SPACE		(1024)	/* total overkill */
-
 #ifdef RPC_DEBUG
 # define RPCDBG_FACILITY	RPCDBG_CALL
 #endif
 
+#define dprint_status(t)					\
+	dprintk("RPC: %5u %s (status %d)\n", t->tk_pid,		\
+			__func__, t->tk_status)
+
+/*
+ * All RPC clients are linked into this list
+ */
+static LIST_HEAD(all_clients);
+static DEFINE_SPINLOCK(rpc_client_lock);
+
 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
 
 
@@ -53,16 +61,33 @@ static void	call_allocate(struct rpc_task *task);
 static void	call_encode(struct rpc_task *task);
 static void	call_decode(struct rpc_task *task);
 static void	call_bind(struct rpc_task *task);
+static void	call_bind_status(struct rpc_task *task);
 static void	call_transmit(struct rpc_task *task);
 static void	call_status(struct rpc_task *task);
+static void	call_transmit_status(struct rpc_task *task);
 static void	call_refresh(struct rpc_task *task);
 static void	call_refreshresult(struct rpc_task *task);
 static void	call_timeout(struct rpc_task *task);
 static void	call_connect(struct rpc_task *task);
 static void	call_connect_status(struct rpc_task *task);
-static u32 *	call_header(struct rpc_task *task);
-static u32 *	call_verify(struct rpc_task *task);
+static __be32 *	call_header(struct rpc_task *task);
+static __be32 *	call_verify(struct rpc_task *task);
+
+static int	rpc_ping(struct rpc_clnt *clnt, int flags);
+
+static void rpc_register_client(struct rpc_clnt *clnt)
+{
+	spin_lock(&rpc_client_lock);
+	list_add(&clnt->cl_clients, &all_clients);
+	spin_unlock(&rpc_client_lock);
+}
 
+static void rpc_unregister_client(struct rpc_clnt *clnt)
+{
+	spin_lock(&rpc_client_lock);
+	list_del(&clnt->cl_clients);
+	spin_unlock(&rpc_client_lock);
+}
 
 static int
 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
@@ -70,8 +95,15 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
 	static uint32_t clntid;
 	int error;
 
+	clnt->cl_vfsmnt = ERR_PTR(-ENOENT);
+	clnt->cl_dentry = ERR_PTR(-ENOENT);
 	if (dir_name == NULL)
 		return 0;
+
+	clnt->cl_vfsmnt = rpc_get_mount();
+	if (IS_ERR(clnt->cl_vfsmnt))
+		return PTR_ERR(clnt->cl_vfsmnt);
+
 	for (;;) {
 		snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
 				"%s/clnt%x", dir_name,
@@ -84,133 +116,222 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
 		if (error != -EEXIST) {
 			printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
 					clnt->cl_pathname, error);
+			rpc_put_mount();
 			return error;
 		}
 	}
 }
 
-/*
- * Create an RPC client
- * FIXME: This should also take a flags argument (as in task->tk_flags).
- * It's called (among others) from pmap_create_client, which may in
- * turn be called by an async task. In this case, rpciod should not be
- * made to sleep too long.
- */
-struct rpc_clnt *
-rpc_new_client(struct rpc_xprt *xprt, char *servname,
-		  struct rpc_program *program, u32 vers,
-		  rpc_authflavor_t flavor)
+static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
 {
+	struct rpc_program	*program = args->program;
 	struct rpc_version	*version;
 	struct rpc_clnt		*clnt = NULL;
+	struct rpc_auth		*auth;
 	int err;
-	int len;
+	size_t len;
 
-	dprintk("RPC: creating %s client for %s (xprt %p)\n",
-		program->name, servname, xprt);
+	/* sanity check the name before trying to print it */
+	err = -EINVAL;
+	len = strlen(args->servername);
+	if (len > RPC_MAXNETNAMELEN)
+		goto out_no_rpciod;
+	len++;
 
+	dprintk("RPC:       creating %s client for %s (xprt %p)\n",
+			program->name, args->servername, xprt);
+
+	err = rpciod_up();
+	if (err)
+		goto out_no_rpciod;
 	err = -EINVAL;
 	if (!xprt)
+		goto out_no_xprt;
+
+	if (args->version >= program->nrvers)
 		goto out_err;
-	if (vers >= program->nrvers || !(version = program->version[vers]))
+	version = program->version[args->version];
+	if (version == NULL)
 		goto out_err;
 
 	err = -ENOMEM;
-	clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL);
+	clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
 	if (!clnt)
 		goto out_err;
-	memset(clnt, 0, sizeof(*clnt));
-	atomic_set(&clnt->cl_users, 0);
-	atomic_set(&clnt->cl_count, 1);
 	clnt->cl_parent = clnt;
 
 	clnt->cl_server = clnt->cl_inline_name;
-	len = strlen(servname) + 1;
 	if (len > sizeof(clnt->cl_inline_name)) {
 		char *buf = kmalloc(len, GFP_KERNEL);
-		if (buf != 0)
+		if (buf != NULL)
 			clnt->cl_server = buf;
 		else
 			len = sizeof(clnt->cl_inline_name);
 	}
-	strlcpy(clnt->cl_server, servname, len);
+	strlcpy(clnt->cl_server, args->servername, len);
 
 	clnt->cl_xprt     = xprt;
 	clnt->cl_procinfo = version->procs;
 	clnt->cl_maxproc  = version->nrprocs;
 	clnt->cl_protname = program->name;
-	clnt->cl_pmap	  = &clnt->cl_pmap_default;
-	clnt->cl_port     = xprt->addr.sin_port;
 	clnt->cl_prog     = program->number;
 	clnt->cl_vers     = version->number;
-	clnt->cl_prot     = xprt->prot;
 	clnt->cl_stats    = program->stats;
-	rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
+	clnt->cl_metrics  = rpc_alloc_iostats(clnt);
+	err = -ENOMEM;
+	if (clnt->cl_metrics == NULL)
+		goto out_no_stats;
+	clnt->cl_program  = program;
+	INIT_LIST_HEAD(&clnt->cl_tasks);
+	spin_lock_init(&clnt->cl_lock);
 
-	if (!clnt->cl_port)
+	if (!xprt_bound(clnt->cl_xprt))
 		clnt->cl_autobind = 1;
 
+	clnt->cl_timeout = xprt->timeout;
+	if (args->timeout != NULL) {
+		memcpy(&clnt->cl_timeout_default, args->timeout,
+				sizeof(clnt->cl_timeout_default));
+		clnt->cl_timeout = &clnt->cl_timeout_default;
+	}
+
 	clnt->cl_rtt = &clnt->cl_rtt_default;
-	rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
+	rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
+
+	kref_init(&clnt->cl_kref);
 
 	err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
 	if (err < 0)
 		goto out_no_path;
 
-	err = -ENOMEM;
-	if (!rpcauth_create(flavor, clnt)) {
+	auth = rpcauth_create(args->authflavor, clnt);
+	if (IS_ERR(auth)) {
 		printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
-				flavor);
+				args->authflavor);
+		err = PTR_ERR(auth);
 		goto out_no_auth;
 	}
 
 	/* save the nodename */
-	clnt->cl_nodelen = strlen(system_utsname.nodename);
+	clnt->cl_nodelen = strlen(utsname()->nodename);
 	if (clnt->cl_nodelen > UNX_MAXNODENAME)
 		clnt->cl_nodelen = UNX_MAXNODENAME;
-	memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
+	memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen);
+	rpc_register_client(clnt);
 	return clnt;
 
 out_no_auth:
-	rpc_rmdir(clnt->cl_pathname);
+	if (!IS_ERR(clnt->cl_dentry)) {
+		rpc_rmdir(clnt->cl_dentry);
+		rpc_put_mount();
+	}
 out_no_path:
+	rpc_free_iostats(clnt->cl_metrics);
+out_no_stats:
 	if (clnt->cl_server != clnt->cl_inline_name)
 		kfree(clnt->cl_server);
 	kfree(clnt);
 out_err:
-	xprt_destroy(xprt);
+	xprt_put(xprt);
+out_no_xprt:
+	rpciod_down();
+out_no_rpciod:
 	return ERR_PTR(err);
 }
 
-/**
- * Create an RPC client
- * @xprt - pointer to xprt struct
- * @servname - name of server
- * @info - rpc_program
- * @version - rpc_program version
- * @authflavor - rpc_auth flavour to use
+/*
+ * rpc_create - create an RPC client and transport with one call
+ * @args: rpc_clnt create argument structure
  *
- * Creates an RPC client structure, then pings the server in order to
- * determine if it is up, and if it supports this program and version.
+ * Creates and initializes an RPC transport and an RPC client.
  *
- * This function should never be called by asynchronous tasks such as
- * the portmapper.
+ * It can ping the server in order to determine if it is up, and to see if
+ * it supports this program and version.  RPC_CLNT_CREATE_NOPING disables
+ * this behavior so asynchronous tasks can also use rpc_create.
  */
-struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname,
-		struct rpc_program *info, u32 version, rpc_authflavor_t authflavor)
+struct rpc_clnt *rpc_create(struct rpc_create_args *args)
 {
+	struct rpc_xprt *xprt;
 	struct rpc_clnt *clnt;
-	int err;
-	
-	clnt = rpc_new_client(xprt, servname, info, version, authflavor);
+	struct xprt_create xprtargs = {
+		.ident = args->protocol,
+		.srcaddr = args->saddress,
+		.dstaddr = args->address,
+		.addrlen = args->addrsize,
+	};
+	char servername[48];
+
+	xprt = xprt_create_transport(&xprtargs);
+	if (IS_ERR(xprt))
+		return (struct rpc_clnt *)xprt;
+
+	/*
+	 * If the caller chooses not to specify a hostname, whip
+	 * up a string representation of the passed-in address.
+	 */
+	if (args->servername == NULL) {
+		servername[0] = '\0';
+		switch (args->address->sa_family) {
+		case AF_INET: {
+			struct sockaddr_in *sin =
+					(struct sockaddr_in *)args->address;
+			snprintf(servername, sizeof(servername), NIPQUAD_FMT,
+				 NIPQUAD(sin->sin_addr.s_addr));
+			break;
+		}
+		case AF_INET6: {
+			struct sockaddr_in6 *sin =
+					(struct sockaddr_in6 *)args->address;
+			snprintf(servername, sizeof(servername), NIP6_FMT,
+				 NIP6(sin->sin6_addr));
+			break;
+		}
+		default:
+			/* caller wants default server name, but
+			 * address family isn't recognized. */
+			return ERR_PTR(-EINVAL);
+		}
+		args->servername = servername;
+	}
+
+	xprt = xprt_create_transport(&xprtargs);
+	if (IS_ERR(xprt))
+		return (struct rpc_clnt *)xprt;
+
+	/*
+	 * By default, kernel RPC client connects from a reserved port.
+	 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
+	 * but it is always enabled for rpciod, which handles the connect
+	 * operation.
+	 */
+	xprt->resvport = 1;
+	if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
+		xprt->resvport = 0;
+
+	clnt = rpc_new_client(args, xprt);
 	if (IS_ERR(clnt))
 		return clnt;
-	err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR);
-	if (err == 0)
-		return clnt;
-	rpc_shutdown_client(clnt);
-	return ERR_PTR(err);
+
+	if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
+		int err = rpc_ping(clnt, RPC_TASK_SOFT);
+		if (err != 0) {
+			rpc_shutdown_client(clnt);
+			return ERR_PTR(err);
+		}
+	}
+
+	clnt->cl_softrtry = 1;
+	if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
+		clnt->cl_softrtry = 0;
+
+	if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
+		clnt->cl_autobind = 1;
+	if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
+		clnt->cl_discrtry = 1;
+
+	return clnt;
 }
+EXPORT_SYMBOL_GPL(rpc_create);
 
 /*
  * This function clones the RPC client structure. It allows us to share the
@@ -221,267 +342,317 @@ struct rpc_clnt *
 rpc_clone_client(struct rpc_clnt *clnt)
 {
 	struct rpc_clnt *new;
+	int err = -ENOMEM;
 
-	new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
+	new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
 	if (!new)
 		goto out_no_clnt;
-	memcpy(new, clnt, sizeof(*new));
-	atomic_set(&new->cl_count, 1);
-	atomic_set(&new->cl_users, 0);
 	new->cl_parent = clnt;
-	atomic_inc(&clnt->cl_count);
-	/* Duplicate portmapper */
-	rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
 	/* Turn off autobind on clones */
 	new->cl_autobind = 0;
-	new->cl_oneshot = 0;
-	new->cl_dead = 0;
-	rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
+	INIT_LIST_HEAD(&new->cl_tasks);
+	spin_lock_init(&new->cl_lock);
+	rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval);
+	new->cl_metrics = rpc_alloc_iostats(clnt);
+	if (new->cl_metrics == NULL)
+		goto out_no_stats;
+	kref_init(&new->cl_kref);
+	err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
+	if (err != 0)
+		goto out_no_path;
 	if (new->cl_auth)
 		atomic_inc(&new->cl_auth->au_count);
+	xprt_get(clnt->cl_xprt);
+	kref_get(&clnt->cl_kref);
+	rpc_register_client(new);
+	rpciod_up();
 	return new;
+out_no_path:
+	rpc_free_iostats(new->cl_metrics);
+out_no_stats:
+	kfree(new);
 out_no_clnt:
-	printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
-	return ERR_PTR(-ENOMEM);
+	dprintk("RPC:       %s: returned error %d\n", __func__, err);
+	return ERR_PTR(err);
 }
+EXPORT_SYMBOL_GPL(rpc_clone_client);
 
 /*
  * Properly shut down an RPC client, terminating all outstanding
- * requests. Note that we must be certain that cl_oneshot and
- * cl_dead are cleared, or else the client would be destroyed
- * when the last task releases it.
+ * requests.
  */
-int
-rpc_shutdown_client(struct rpc_clnt *clnt)
+void rpc_shutdown_client(struct rpc_clnt *clnt)
 {
-	dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
-			clnt->cl_protname, clnt->cl_server,
-			atomic_read(&clnt->cl_users));
-
-	while (atomic_read(&clnt->cl_users) > 0) {
-		/* Don't let rpc_release_client destroy us */
-		clnt->cl_oneshot = 0;
-		clnt->cl_dead = 0;
-		rpc_killall_tasks(clnt);
-		sleep_on_timeout(&destroy_wait, 1*HZ);
-	}
+	dprintk("RPC:       shutting down %s client for %s\n",
+			clnt->cl_protname, clnt->cl_server);
 
-	if (atomic_read(&clnt->cl_users) < 0) {
-		printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
-				clnt, atomic_read(&clnt->cl_users));
-#ifdef RPC_DEBUG
-		rpc_show_tasks();
-#endif
-		BUG();
+	while (!list_empty(&clnt->cl_tasks)) {
+		rpc_killall_tasks(clnt);
+		wait_event_timeout(destroy_wait,
+			list_empty(&clnt->cl_tasks), 1*HZ);
 	}
 
-	return rpc_destroy_client(clnt);
+	rpc_release_client(clnt);
 }
+EXPORT_SYMBOL_GPL(rpc_shutdown_client);
 
 /*
- * Delete an RPC client
+ * Free an RPC client
  */
-int
-rpc_destroy_client(struct rpc_clnt *clnt)
+static void
+rpc_free_client(struct kref *kref)
 {
-	if (!atomic_dec_and_test(&clnt->cl_count))
-		return 1;
-	BUG_ON(atomic_read(&clnt->cl_users) != 0);
+	struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
 
-	dprintk("RPC: destroying %s client for %s\n",
+	dprintk("RPC:       destroying %s client for %s\n",
 			clnt->cl_protname, clnt->cl_server);
-	if (clnt->cl_auth) {
-		rpcauth_destroy(clnt->cl_auth);
-		clnt->cl_auth = NULL;
+	if (!IS_ERR(clnt->cl_dentry)) {
+		rpc_rmdir(clnt->cl_dentry);
+		rpc_put_mount();
 	}
 	if (clnt->cl_parent != clnt) {
-		rpc_destroy_client(clnt->cl_parent);
+		rpc_release_client(clnt->cl_parent);
 		goto out_free;
 	}
-	if (clnt->cl_pathname[0])
-		rpc_rmdir(clnt->cl_pathname);
-	if (clnt->cl_xprt) {
-		xprt_destroy(clnt->cl_xprt);
-		clnt->cl_xprt = NULL;
-	}
 	if (clnt->cl_server != clnt->cl_inline_name)
 		kfree(clnt->cl_server);
 out_free:
+	rpc_unregister_client(clnt);
+	rpc_free_iostats(clnt->cl_metrics);
+	clnt->cl_metrics = NULL;
+	xprt_put(clnt->cl_xprt);
+	rpciod_down();
 	kfree(clnt);
-	return 0;
 }
 
 /*
- * Release an RPC client
+ * Free an RPC client
  */
-void
-rpc_release_client(struct rpc_clnt *clnt)
+static void
+rpc_free_auth(struct kref *kref)
 {
-	dprintk("RPC:      rpc_release_client(%p, %d)\n",
-				clnt, atomic_read(&clnt->cl_users));
+	struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
 
-	if (!atomic_dec_and_test(&clnt->cl_users))
+	if (clnt->cl_auth == NULL) {
+		rpc_free_client(kref);
 		return;
-	wake_up(&destroy_wait);
-	if (clnt->cl_oneshot || clnt->cl_dead)
-		rpc_destroy_client(clnt);
+	}
+
+	/*
+	 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
+	 *       release remaining GSS contexts. This mechanism ensures
+	 *       that it can do so safely.
+	 */
+	kref_init(kref);
+	rpcauth_release(clnt->cl_auth);
+	clnt->cl_auth = NULL;
+	kref_put(kref, rpc_free_client);
 }
 
 /*
- * Default callback for async RPC calls
+ * Release reference to the RPC client
  */
-static void
-rpc_default_callback(struct rpc_task *task)
+void
+rpc_release_client(struct rpc_clnt *clnt)
 {
+	dprintk("RPC:       rpc_release_client(%p)\n", clnt);
+
+	if (list_empty(&clnt->cl_tasks))
+		wake_up(&destroy_wait);
+	kref_put(&clnt->cl_kref, rpc_free_auth);
 }
 
-/*
- *	Export the signal mask handling for aysnchronous code that
- *	sleeps on RPC calls
+/**
+ * rpc_bind_new_program - bind a new RPC program to an existing client
+ * @old: old rpc_client
+ * @program: rpc program to set
+ * @vers: rpc program version
+ *
+ * Clones the rpc client and sets up a new RPC program. This is mainly
+ * of use for enabling different RPC programs to share the same transport.
+ * The Sun NFSv2/v3 ACL protocol can do this.
  */
- 
-void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
+struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
+				      struct rpc_program *program,
+				      u32 vers)
 {
-	unsigned long	sigallow = sigmask(SIGKILL);
-	unsigned long	irqflags;
-	
-	/* Turn off various signals */
-	if (clnt->cl_intr) {
-		struct k_sigaction *action = current->sighand->action;
-		if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
-			sigallow |= sigmask(SIGINT);
-		if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
-			sigallow |= sigmask(SIGQUIT);
-	}
-	spin_lock_irqsave(&current->sighand->siglock, irqflags);
-	*oldset = current->blocked;
-	siginitsetinv(&current->blocked, sigallow & ~oldset->sig[0]);
-	recalc_sigpending();
-	spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
-}
+	struct rpc_clnt *clnt;
+	struct rpc_version *version;
+	int err;
 
-void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
-{
-	unsigned long	irqflags;
-	
-	spin_lock_irqsave(&current->sighand->siglock, irqflags);
-	current->blocked = *oldset;
-	recalc_sigpending();
-	spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
+	BUG_ON(vers >= program->nrvers || !program->version[vers]);
+	version = program->version[vers];
+	clnt = rpc_clone_client(old);
+	if (IS_ERR(clnt))
+		goto out;
+	clnt->cl_procinfo = version->procs;
+	clnt->cl_maxproc  = version->nrprocs;
+	clnt->cl_protname = program->name;
+	clnt->cl_prog     = program->number;
+	clnt->cl_vers     = version->number;
+	clnt->cl_stats    = program->stats;
+	err = rpc_ping(clnt, RPC_TASK_SOFT);
+	if (err != 0) {
+		rpc_shutdown_client(clnt);
+		clnt = ERR_PTR(err);
+	}
+out:
+	return clnt;
 }
+EXPORT_SYMBOL_GPL(rpc_bind_new_program);
 
 /*
- * New rpc_call implementation
+ * Default callback for async RPC calls
  */
-int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
+static void
+rpc_default_callback(struct rpc_task *task, void *data)
 {
-	struct rpc_task	*task;
-	sigset_t	oldset;
-	int		status;
-
-	/* If this client is slain all further I/O fails */
-	if (clnt->cl_dead) 
-		return -EIO;
+}
 
-	BUG_ON(flags & RPC_TASK_ASYNC);
+static const struct rpc_call_ops rpc_default_ops = {
+	.rpc_call_done = rpc_default_callback,
+};
 
-	rpc_clnt_sigmask(clnt, &oldset);		
+/**
+ * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
+ * @task_setup_data: pointer to task initialisation data
+ */
+struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
+{
+	struct rpc_task *task, *ret;
 
-	status = -ENOMEM;
-	task = rpc_new_task(clnt, NULL, flags);
-	if (task == NULL)
+	task = rpc_new_task(task_setup_data);
+	if (task == NULL) {
+		rpc_release_calldata(task_setup_data->callback_ops,
+				task_setup_data->callback_data);
+		ret = ERR_PTR(-ENOMEM);
 		goto out;
-
-	rpc_call_setup(task, msg, 0);
-
-	/* Set up the call info struct and execute the task */
-	if (task->tk_status == 0)
-		status = rpc_execute(task);
-	else {
-		status = task->tk_status;
-		rpc_release_task(task);
 	}
 
+	if (task->tk_status != 0) {
+		ret = ERR_PTR(task->tk_status);
+		rpc_put_task(task);
+		goto out;
+	}
+	atomic_inc(&task->tk_count);
+	rpc_execute(task);
+	ret = task;
 out:
-	rpc_clnt_sigunmask(clnt, &oldset);		
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpc_run_task);
 
+/**
+ * rpc_call_sync - Perform a synchronous RPC call
+ * @clnt: pointer to RPC client
+ * @msg: RPC call parameters
+ * @flags: RPC call flags
+ */
+int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
+{
+	struct rpc_task	*task;
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_message = msg,
+		.callback_ops = &rpc_default_ops,
+		.flags = flags,
+	};
+	int status;
+
+	BUG_ON(flags & RPC_TASK_ASYNC);
+
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = task->tk_status;
+	rpc_put_task(task);
 	return status;
 }
+EXPORT_SYMBOL_GPL(rpc_call_sync);
 
-/*
- * New rpc_call implementation
+/**
+ * rpc_call_async - Perform an asynchronous RPC call
+ * @clnt: pointer to RPC client
+ * @msg: RPC call parameters
+ * @flags: RPC call flags
+ * @tk_ops: RPC call ops
+ * @data: user call data
  */
 int
 rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
-	       rpc_action callback, void *data)
+	       const struct rpc_call_ops *tk_ops, void *data)
 {
 	struct rpc_task	*task;
-	sigset_t	oldset;
-	int		status;
-
-	/* If this client is slain all further I/O fails */
-	if (clnt->cl_dead) 
-		return -EIO;
-
-	flags |= RPC_TASK_ASYNC;
-
-	rpc_clnt_sigmask(clnt, &oldset);		
-
-	/* Create/initialize a new RPC task */
-	if (!callback)
-		callback = rpc_default_callback;
-	status = -ENOMEM;
-	if (!(task = rpc_new_task(clnt, callback, flags)))
-		goto out;
-	task->tk_calldata = data;
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_message = msg,
+		.callback_ops = tk_ops,
+		.callback_data = data,
+		.flags = flags|RPC_TASK_ASYNC,
+	};
 
-	rpc_call_setup(task, msg, 0);
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	rpc_put_task(task);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rpc_call_async);
 
-	/* Set up the call info struct and execute the task */
-	status = task->tk_status;
-	if (status == 0)
-		rpc_execute(task);
-	else
-		rpc_release_task(task);
+void
+rpc_call_start(struct rpc_task *task)
+{
+	task->tk_action = call_start;
+}
+EXPORT_SYMBOL_GPL(rpc_call_start);
 
-out:
-	rpc_clnt_sigunmask(clnt, &oldset);		
+/**
+ * rpc_peeraddr - extract remote peer address from clnt's xprt
+ * @clnt: RPC client structure
+ * @buf: target buffer
+ * @bufsize: length of target buffer
+ *
+ * Returns the number of bytes that are actually in the stored address.
+ */
+size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
+{
+	size_t bytes;
+	struct rpc_xprt *xprt = clnt->cl_xprt;
 
-	return status;
+	bytes = sizeof(xprt->addr);
+	if (bytes > bufsize)
+		bytes = bufsize;
+	memcpy(buf, &clnt->cl_xprt->addr, bytes);
+	return xprt->addrlen;
 }
+EXPORT_SYMBOL_GPL(rpc_peeraddr);
 
-
-void
-rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
+/**
+ * rpc_peeraddr2str - return remote peer address in printable format
+ * @clnt: RPC client structure
+ * @format: address format
+ *
+ */
+const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
+			     enum rpc_display_format_t format)
 {
-	task->tk_msg   = *msg;
-	task->tk_flags |= flags;
-	/* Bind the user cred */
-	if (task->tk_msg.rpc_cred != NULL)
-		rpcauth_holdcred(task);
-	else
-		rpcauth_bindcred(task);
+	struct rpc_xprt *xprt = clnt->cl_xprt;
 
-	if (task->tk_status == 0)
-		task->tk_action = call_start;
+	if (xprt->address_strings[format] != NULL)
+		return xprt->address_strings[format];
 	else
-		task->tk_action = NULL;
+		return "unprintable";
 }
+EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
 
 void
 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
 {
 	struct rpc_xprt *xprt = clnt->cl_xprt;
-
-	xprt->sndsize = 0;
-	if (sndsize)
-		xprt->sndsize = sndsize + RPC_SLACK_SPACE;
-	xprt->rcvsize = 0;
-	if (rcvsize)
-		xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
-	if (xprt_connected(xprt))
-		xprt_sock_setbufsize(xprt);
+	if (xprt->ops->set_buffer_size)
+		xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
 }
+EXPORT_SYMBOL_GPL(rpc_setbufsize);
 
 /*
  * Return size of largest payload RPC client can support, in bytes
@@ -495,7 +666,19 @@ size_t rpc_max_payload(struct rpc_clnt *clnt)
 {
 	return clnt->cl_xprt->max_payload;
 }
-EXPORT_SYMBOL(rpc_max_payload);
+EXPORT_SYMBOL_GPL(rpc_max_payload);
+
+/**
+ * rpc_force_rebind - force transport to check that remote port is unchanged
+ * @clnt: client to rebind
+ *
+ */
+void rpc_force_rebind(struct rpc_clnt *clnt)
+{
+	if (clnt->cl_autobind)
+		xprt_clear_bound(clnt->cl_xprt);
+}
+EXPORT_SYMBOL_GPL(rpc_force_rebind);
 
 /*
  * Restart an (async) RPC call. Usually called from within the
@@ -509,6 +692,7 @@ rpc_restart_call(struct rpc_task *task)
 
 	task->tk_action = call_start;
 }
+EXPORT_SYMBOL_GPL(rpc_restart_call);
 
 /*
  * 0.  Initial state
@@ -521,9 +705,10 @@ call_start(struct rpc_task *task)
 {
 	struct rpc_clnt	*clnt = task->tk_client;
 
-	dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
-		clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
-		(RPC_IS_ASYNC(task) ? "async" : "sync"));
+	dprintk("RPC: %5u call_start %s%d proc %d (%s)\n", task->tk_pid,
+			clnt->cl_protname, clnt->cl_vers,
+			task->tk_msg.rpc_proc->p_proc,
+			(RPC_IS_ASYNC(task) ? "async" : "sync"));
 
 	/* Increment call count */
 	task->tk_msg.rpc_proc->p_count++;
@@ -537,7 +722,7 @@ call_start(struct rpc_task *task)
 static void
 call_reserve(struct rpc_task *task)
 {
-	dprintk("RPC: %4d call_reserve\n", task->tk_pid);
+	dprint_status(task);
 
 	if (!rpcauth_uptodatecred(task)) {
 		task->tk_action = call_refresh;
@@ -557,8 +742,7 @@ call_reserveresult(struct rpc_task *task)
 {
 	int status = task->tk_status;
 
-	dprintk("RPC: %4d call_reserveresult (status %d)\n",
-				task->tk_pid, task->tk_status);
+	dprint_status(task);
 
 	/*
 	 * After a call to xprt_reserve(), we must have either
@@ -572,7 +756,7 @@ call_reserveresult(struct rpc_task *task)
 		}
 
 		printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
-				__FUNCTION__, status);
+				__func__, status);
 		rpc_exit(task, -EIO);
 		return;
 	}
@@ -583,7 +767,7 @@ call_reserveresult(struct rpc_task *task)
 	 */
 	if (task->tk_rqstp) {
 		printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
-				__FUNCTION__, status);
+				__func__, status);
 		xprt_release(task);
 	}
 
@@ -595,7 +779,7 @@ call_reserveresult(struct rpc_task *task)
 		break;
 	default:
 		printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
-				__FUNCTION__, status);
+				__func__, status);
 		break;
 	}
 	rpc_exit(task, status);
@@ -603,30 +787,49 @@ call_reserveresult(struct rpc_task *task)
 
 /*
  * 2.	Allocate the buffer. For details, see sched.c:rpc_malloc.
- *	(Note: buffer memory is freed in rpc_task_release).
+ *	(Note: buffer memory is freed in xprt_release).
  */
 static void
 call_allocate(struct rpc_task *task)
 {
-	unsigned int	bufsiz;
+	unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack;
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = task->tk_xprt;
+	struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
+
+	dprint_status(task);
 
-	dprintk("RPC: %4d call_allocate (status %d)\n", 
-				task->tk_pid, task->tk_status);
+	task->tk_status = 0;
 	task->tk_action = call_bind;
-	if (task->tk_buffer)
+
+	if (req->rq_buffer)
 		return;
 
-	/* FIXME: compute buffer requirements more exactly using
-	 * auth->au_wslack */
-	bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
+	if (proc->p_proc != 0) {
+		BUG_ON(proc->p_arglen == 0);
+		if (proc->p_decode != NULL)
+			BUG_ON(proc->p_replen == 0);
+	}
 
-	if (rpc_malloc(task, bufsiz << 1) != NULL)
+	/*
+	 * Calculate the size (in quads) of the RPC call
+	 * and reply headers, and convert both values
+	 * to byte sizes.
+	 */
+	req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
+	req->rq_callsize <<= 2;
+	req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
+	req->rq_rcvsize <<= 2;
+
+	req->rq_buffer = xprt->ops->buf_alloc(task,
+					req->rq_callsize + req->rq_rcvsize);
+	if (req->rq_buffer != NULL)
 		return;
-	printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); 
 
-	if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
-		xprt_release(task);
-		task->tk_action = call_reserve;
+	dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
+
+	if (RPC_IS_ASYNC(task) || !signalled()) {
+		task->tk_action = call_allocate;
 		rpc_delay(task, HZ>>4);
 		return;
 	}
@@ -634,38 +837,48 @@ call_allocate(struct rpc_task *task)
 	rpc_exit(task, -ERESTARTSYS);
 }
 
+static inline int
+rpc_task_need_encode(struct rpc_task *task)
+{
+	return task->tk_rqstp->rq_snd_buf.len == 0;
+}
+
+static inline void
+rpc_task_force_reencode(struct rpc_task *task)
+{
+	task->tk_rqstp->rq_snd_buf.len = 0;
+}
+
+static inline void
+rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
+{
+	buf->head[0].iov_base = start;
+	buf->head[0].iov_len = len;
+	buf->tail[0].iov_len = 0;
+	buf->page_len = 0;
+	buf->flags = 0;
+	buf->len = 0;
+	buf->buflen = len;
+}
+
 /*
  * 3.	Encode arguments of an RPC call
  */
 static void
 call_encode(struct rpc_task *task)
 {
-	struct rpc_clnt	*clnt = task->tk_client;
 	struct rpc_rqst	*req = task->tk_rqstp;
-	struct xdr_buf *sndbuf = &req->rq_snd_buf;
-	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
-	unsigned int	bufsiz;
 	kxdrproc_t	encode;
-	int		status;
-	u32		*p;
-
-	dprintk("RPC: %4d call_encode (status %d)\n", 
-				task->tk_pid, task->tk_status);
-
-	/* Default buffer setup */
-	bufsiz = task->tk_bufsize >> 1;
-	sndbuf->head[0].iov_base = (void *)task->tk_buffer;
-	sndbuf->head[0].iov_len  = bufsiz;
-	sndbuf->tail[0].iov_len  = 0;
-	sndbuf->page_len	 = 0;
-	sndbuf->len		 = 0;
-	sndbuf->buflen		 = bufsiz;
-	rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
-	rcvbuf->head[0].iov_len  = bufsiz;
-	rcvbuf->tail[0].iov_len  = 0;
-	rcvbuf->page_len	 = 0;
-	rcvbuf->len		 = 0;
-	rcvbuf->buflen		 = bufsiz;
+	__be32		*p;
+
+	dprint_status(task);
+
+	rpc_xdr_buf_init(&req->rq_snd_buf,
+			 req->rq_buffer,
+			 req->rq_callsize);
+	rpc_xdr_buf_init(&req->rq_rcv_buf,
+			 (char *)req->rq_buffer + req->rq_callsize,
+			 req->rq_rcvsize);
 
 	/* Encode header and provided arguments */
 	encode = task->tk_msg.rpc_proc->p_encode;
@@ -674,11 +887,15 @@ call_encode(struct rpc_task *task)
 		rpc_exit(task, -EIO);
 		return;
 	}
-	if (encode && (status = rpcauth_wrap_req(task, encode, req, p,
-						 task->tk_msg.rpc_argp)) < 0) {
-		printk(KERN_WARNING "%s: can't encode arguments: %d\n",
-				clnt->cl_protname, -status);
-		rpc_exit(task, status);
+	if (encode == NULL)
+		return;
+
+	task->tk_status = rpcauth_wrap_req(task, encode, req, p,
+			task->tk_msg.rpc_argp);
+	if (task->tk_status == -ENOMEM) {
+		/* XXX: Is this sane? */
+		rpc_delay(task, 3*HZ);
+		task->tk_status = -EAGAIN;
 	}
 }
 
@@ -688,44 +905,100 @@ call_encode(struct rpc_task *task)
 static void
 call_bind(struct rpc_task *task)
 {
-	struct rpc_clnt	*clnt = task->tk_client;
-	struct rpc_xprt *xprt = clnt->cl_xprt;
+	struct rpc_xprt *xprt = task->tk_xprt;
 
-	dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
-			xprt, (xprt_connected(xprt) ? "is" : "is not"));
+	dprint_status(task);
 
-	task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
+	task->tk_action = call_connect;
+	if (!xprt_bound(xprt)) {
+		task->tk_action = call_bind_status;
+		task->tk_timeout = xprt->bind_timeout;
+		xprt->ops->rpcbind(task);
+	}
+}
 
-	if (!clnt->cl_port) {
+/*
+ * 4a.	Sort out bind result
+ */
+static void
+call_bind_status(struct rpc_task *task)
+{
+	int status = -EIO;
+
+	if (task->tk_status >= 0) {
+		dprint_status(task);
+		task->tk_status = 0;
 		task->tk_action = call_connect;
-		task->tk_timeout = RPC_CONNECT_TIMEOUT;
-		rpc_getport(task, clnt);
+		return;
+	}
+
+	switch (task->tk_status) {
+	case -EAGAIN:
+		dprintk("RPC: %5u rpcbind waiting for another request "
+				"to finish\n", task->tk_pid);
+		/* avoid busy-waiting here -- could be a network outage. */
+		rpc_delay(task, 5*HZ);
+		goto retry_timeout;
+	case -EACCES:
+		dprintk("RPC: %5u remote rpcbind: RPC program/version "
+				"unavailable\n", task->tk_pid);
+		/* fail immediately if this is an RPC ping */
+		if (task->tk_msg.rpc_proc->p_proc == 0) {
+			status = -EOPNOTSUPP;
+			break;
+		}
+		rpc_delay(task, 3*HZ);
+		goto retry_timeout;
+	case -ETIMEDOUT:
+		dprintk("RPC: %5u rpcbind request timed out\n",
+				task->tk_pid);
+		goto retry_timeout;
+	case -EPFNOSUPPORT:
+		/* server doesn't support any rpcbind version we know of */
+		dprintk("RPC: %5u remote rpcbind service unavailable\n",
+				task->tk_pid);
+		break;
+	case -EPROTONOSUPPORT:
+		dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
+				task->tk_pid);
+		task->tk_status = 0;
+		task->tk_action = call_bind;
+		return;
+	default:
+		dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
+				task->tk_pid, -task->tk_status);
 	}
+
+	rpc_exit(task, status);
+	return;
+
+retry_timeout:
+	task->tk_action = call_timeout;
 }
 
 /*
- * 4a.	Connect to the RPC server (TCP case)
+ * 4b.	Connect to the RPC server
  */
 static void
 call_connect(struct rpc_task *task)
 {
-	struct rpc_clnt *clnt = task->tk_client;
+	struct rpc_xprt *xprt = task->tk_xprt;
 
-	dprintk("RPC: %4d call_connect status %d\n",
-				task->tk_pid, task->tk_status);
+	dprintk("RPC: %5u call_connect xprt %p %s connected\n",
+			task->tk_pid, xprt,
+			(xprt_connected(xprt) ? "is" : "is not"));
 
-	if (xprt_connected(clnt->cl_xprt)) {
-		task->tk_action = call_transmit;
-		return;
+	task->tk_action = call_transmit;
+	if (!xprt_connected(xprt)) {
+		task->tk_action = call_connect_status;
+		if (task->tk_status < 0)
+			return;
+		xprt_connect(task);
 	}
-	task->tk_action = call_connect_status;
-	if (task->tk_status < 0)
-		return;
-	xprt_connect(task);
 }
 
 /*
- * 4b. Sort out connect result
+ * 4c.	Sort out connect result
  */
 static void
 call_connect_status(struct rpc_task *task)
@@ -733,6 +1006,8 @@ call_connect_status(struct rpc_task *task)
 	struct rpc_clnt *clnt = task->tk_client;
 	int status = task->tk_status;
 
+	dprint_status(task);
+
 	task->tk_status = 0;
 	if (status >= 0) {
 		clnt->cl_stats->netreconn++;
@@ -740,18 +1015,21 @@ call_connect_status(struct rpc_task *task)
 		return;
 	}
 
-	/* Something failed: we may have to rebind */
-	if (clnt->cl_autobind)
-		clnt->cl_port = 0;
+	/* Something failed: remote service port may have changed */
+	rpc_force_rebind(clnt);
+
 	switch (status) {
 	case -ENOTCONN:
-	case -ETIMEDOUT:
 	case -EAGAIN:
-		task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
-		break;
-	default:
-		rpc_exit(task, -EIO);
+		task->tk_action = call_bind;
+		if (!RPC_IS_SOFT(task))
+			return;
+		/* if soft mounted, test if we've timed out */
+	case -ETIMEDOUT:
+		task->tk_action = call_timeout;
+		return;
 	}
+	rpc_exit(task, -EIO);
 }
 
 /*
@@ -760,8 +1038,7 @@ call_connect_status(struct rpc_task *task)
 static void
 call_transmit(struct rpc_task *task)
 {
-	dprintk("RPC: %4d call_transmit (status %d)\n", 
-				task->tk_pid, task->tk_status);
+	dprint_status(task);
 
 	task->tk_action = call_status;
 	if (task->tk_status < 0)
@@ -769,18 +1046,44 @@ call_transmit(struct rpc_task *task)
 	task->tk_status = xprt_prepare_transmit(task);
 	if (task->tk_status != 0)
 		return;
+	task->tk_action = call_transmit_status;
 	/* Encode here so that rpcsec_gss can use correct sequence number. */
-	if (!task->tk_rqstp->rq_bytes_sent)
+	if (rpc_task_need_encode(task)) {
+		BUG_ON(task->tk_rqstp->rq_bytes_sent != 0);
 		call_encode(task);
-	if (task->tk_status < 0)
-		return;
+		/* Did the encode result in an error condition? */
+		if (task->tk_status != 0)
+			return;
+	}
 	xprt_transmit(task);
 	if (task->tk_status < 0)
 		return;
-	if (!task->tk_msg.rpc_proc->p_decode) {
-		task->tk_action = NULL;
-		rpc_wake_up_task(task);
-	}
+	/*
+	 * On success, ensure that we call xprt_end_transmit() before sleeping
+	 * in order to allow access to the socket to other RPC requests.
+	 */
+	call_transmit_status(task);
+	if (task->tk_msg.rpc_proc->p_decode != NULL)
+		return;
+	task->tk_action = rpc_exit_task;
+	rpc_wake_up_task(task);
+}
+
+/*
+ * 5a.	Handle cleanup after a transmission
+ */
+static void
+call_transmit_status(struct rpc_task *task)
+{
+	task->tk_action = call_status;
+	/*
+	 * Special case: if we've been waiting on the socket's write_space()
+	 * callback, then don't call xprt_end_transmit().
+	 */
+	if (task->tk_status == -EAGAIN)
+		return;
+	xprt_end_transmit(task);
+	rpc_task_force_reencode(task);
 }
 
 /*
@@ -796,8 +1099,7 @@ call_status(struct rpc_task *task)
 	if (req->rq_received > 0 && !req->rq_bytes_sent)
 		task->tk_status = req->rq_received;
 
-	dprintk("RPC: %4d call_status (status %d)\n", 
-				task->tk_pid, task->tk_status);
+	dprint_status(task);
 
 	status = task->tk_status;
 	if (status >= 0) {
@@ -807,14 +1109,22 @@ call_status(struct rpc_task *task)
 
 	task->tk_status = 0;
 	switch(status) {
+	case -EHOSTDOWN:
+	case -EHOSTUNREACH:
+	case -ENETUNREACH:
+		/*
+		 * Delay any retries for 3 seconds, then handle as if it
+		 * were a timeout.
+		 */
+		rpc_delay(task, 3*HZ);
 	case -ETIMEDOUT:
 		task->tk_action = call_timeout;
+		if (task->tk_client->cl_discrtry)
+			xprt_force_disconnect(task->tk_xprt);
 		break;
 	case -ECONNREFUSED:
 	case -ENOTCONN:
-		req->rq_bytes_sent = 0;
-		if (clnt->cl_autobind)
-			clnt->cl_port = 0;
+		rpc_force_rebind(clnt);
 		task->tk_action = call_bind;
 		break;
 	case -EAGAIN:
@@ -825,11 +1135,9 @@ call_status(struct rpc_task *task)
 		rpc_exit(task, status);
 		break;
 	default:
-		if (clnt->cl_chatty)
-			printk("%s: RPC call returned error %d\n",
+		printk("%s: RPC call returned error %d\n",
 			       clnt->cl_protname, -status);
 		rpc_exit(task, status);
-		break;
 	}
 }
 
@@ -844,26 +1152,26 @@ call_timeout(struct rpc_task *task)
 	struct rpc_clnt	*clnt = task->tk_client;
 
 	if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
-		dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
+		dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
 		goto retry;
 	}
 
-	dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
+	dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
+	task->tk_timeouts++;
+
 	if (RPC_IS_SOFT(task)) {
-		if (clnt->cl_chatty)
-			printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
+		printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
 				clnt->cl_protname, clnt->cl_server);
 		rpc_exit(task, -EIO);
 		return;
 	}
 
-	if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
+	if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
 		task->tk_flags |= RPC_CALL_MAJORSEEN;
 		printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
 			clnt->cl_protname, clnt->cl_server);
 	}
-	if (clnt->cl_autobind)
-		clnt->cl_port = 0;
+	rpc_force_rebind(clnt);
 
 retry:
 	clnt->cl_stats->rpcretrans++;
@@ -880,12 +1188,12 @@ call_decode(struct rpc_task *task)
 	struct rpc_clnt	*clnt = task->tk_client;
 	struct rpc_rqst	*req = task->tk_rqstp;
 	kxdrproc_t	decode = task->tk_msg.rpc_proc->p_decode;
-	u32		*p;
+	__be32		*p;
 
-	dprintk("RPC: %4d call_decode (status %d)\n", 
-				task->tk_pid, task->tk_status);
+	dprintk("RPC: %5u call_decode (status %d)\n",
+			task->tk_pid, task->tk_status);
 
-	if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
+	if (task->tk_flags & RPC_CALL_MAJORSEEN) {
 		printk(KERN_NOTICE "%s: server %s OK\n",
 			clnt->cl_protname, clnt->cl_server);
 		task->tk_flags &= ~RPC_CALL_MAJORSEEN;
@@ -897,12 +1205,17 @@ call_decode(struct rpc_task *task)
 			clnt->cl_stats->rpcretrans++;
 			goto out_retry;
 		}
-		printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
-			clnt->cl_protname, task->tk_status);
-		rpc_exit(task, -EIO);
-		return;
+		dprintk("RPC:       %s: too small RPC reply size (%d bytes)\n",
+				clnt->cl_protname, task->tk_status);
+		task->tk_action = call_timeout;
+		goto out_retry;
 	}
 
+	/*
+	 * Ensure that we see all writes made by xprt_complete_rqst()
+	 * before it changed req->rq_received.
+	 */
+	smp_rmb();
 	req->rq_rcv_buf.len = req->rq_private_buf.len;
 
 	/* Check that the softirq receive buffer is valid */
@@ -910,23 +1223,27 @@ call_decode(struct rpc_task *task)
 				sizeof(req->rq_rcv_buf)) != 0);
 
 	/* Verify the RPC header */
-	if (!(p = call_verify(task))) {
-		if (task->tk_action == NULL)
-			return;
-		goto out_retry;
+	p = call_verify(task);
+	if (IS_ERR(p)) {
+		if (p == ERR_PTR(-EAGAIN))
+			goto out_retry;
+		return;
 	}
 
-	task->tk_action = NULL;
+	task->tk_action = rpc_exit_task;
 
-	if (decode)
+	if (decode) {
 		task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
 						      task->tk_msg.rpc_resp);
-	dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
-					task->tk_status);
+	}
+	dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
+			task->tk_status);
 	return;
 out_retry:
 	req->rq_received = req->rq_private_buf.len = 0;
 	task->tk_status = 0;
+	if (task->tk_client->cl_discrtry)
+		xprt_force_disconnect(task->tk_xprt);
 }
 
 /*
@@ -935,9 +1252,8 @@ out_retry:
 static void
 call_refresh(struct rpc_task *task)
 {
-	dprintk("RPC: %4d call_refresh\n", task->tk_pid);
+	dprint_status(task);
 
-	xprt_release(task);	/* Must do to obtain new XID */
 	task->tk_action = call_refreshresult;
 	task->tk_status = 0;
 	task->tk_client->cl_stats->rpcauthrefresh++;
@@ -951,8 +1267,8 @@ static void
 call_refreshresult(struct rpc_task *task)
 {
 	int status = task->tk_status;
-	dprintk("RPC: %4d call_refreshresult (status %d)\n", 
-				task->tk_pid, task->tk_status);
+
+	dprint_status(task);
 
 	task->tk_status = 0;
 	task->tk_action = call_reserve;
@@ -971,17 +1287,16 @@ call_refreshresult(struct rpc_task *task)
 /*
  * Call header serialization
  */
-static u32 *
+static __be32 *
 call_header(struct rpc_task *task)
 {
 	struct rpc_clnt *clnt = task->tk_client;
-	struct rpc_xprt *xprt = clnt->cl_xprt;
 	struct rpc_rqst	*req = task->tk_rqstp;
-	u32		*p = req->rq_svec[0].iov_base;
+	__be32		*p = req->rq_svec[0].iov_base;
 
 	/* FIXME: check buffer size? */
-	if (xprt->stream)
-		*p++ = 0;		/* fill in later */
+
+	p = xprt_skip_transport_header(task->tk_xprt, p);
 	*p++ = req->rq_xid;		/* XID */
 	*p++ = htonl(RPC_CALL);		/* CALL */
 	*p++ = htonl(RPC_VERSION);	/* RPC version */
@@ -996,21 +1311,34 @@ call_header(struct rpc_task *task)
 /*
  * Reply header verification
  */
-static u32 *
+static __be32 *
 call_verify(struct rpc_task *task)
 {
 	struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
 	int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
-	u32	*p = iov->iov_base, n;
+	__be32	*p = iov->iov_base;
+	u32 n;
 	int error = -EACCES;
 
+	if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
+		/* RFC-1014 says that the representation of XDR data must be a
+		 * multiple of four bytes
+		 * - if it isn't pointer subtraction in the NFS client may give
+		 *   undefined results
+		 */
+		dprintk("RPC: %5u %s: XDR representation not a multiple of"
+		       " 4 bytes: 0x%x\n", task->tk_pid, __func__,
+		       task->tk_rqstp->rq_rcv_buf.len);
+		goto out_eio;
+	}
 	if ((len -= 3) < 0)
 		goto out_overflow;
 	p += 1;	/* skip XID */
 
 	if ((n = ntohl(*p++)) != RPC_REPLY) {
-		printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
-		goto out_retry;
+		dprintk("RPC: %5u %s: not an RPC reply: %x\n",
+				task->tk_pid, __func__, n);
+		goto out_garbage;
 	}
 	if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
 		if (--len < 0)
@@ -1019,10 +1347,15 @@ call_verify(struct rpc_task *task)
 			case RPC_AUTH_ERROR:
 				break;
 			case RPC_MISMATCH:
-				printk(KERN_WARNING "%s: RPC call version mismatch!\n", __FUNCTION__);
-				goto out_eio;
+				dprintk("RPC: %5u %s: RPC call version "
+						"mismatch!\n",
+						task->tk_pid, __func__);
+				error = -EPROTONOSUPPORT;
+				goto out_err;
 			default:
-				printk(KERN_WARNING "%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n);
+				dprintk("RPC: %5u %s: RPC call rejected, "
+						"unknown error: %x\n",
+						task->tk_pid, __func__, n);
 				goto out_eio;
 		}
 		if (--len < 0)
@@ -1035,94 +1368,111 @@ call_verify(struct rpc_task *task)
 			if (!task->tk_cred_retry)
 				break;
 			task->tk_cred_retry--;
-			dprintk("RPC: %4d call_verify: retry stale creds\n",
-							task->tk_pid);
+			dprintk("RPC: %5u %s: retry stale creds\n",
+					task->tk_pid, __func__);
 			rpcauth_invalcred(task);
+			/* Ensure we obtain a new XID! */
+			xprt_release(task);
 			task->tk_action = call_refresh;
-			return NULL;
+			goto out_retry;
 		case RPC_AUTH_BADCRED:
 		case RPC_AUTH_BADVERF:
 			/* possibly garbled cred/verf? */
 			if (!task->tk_garb_retry)
 				break;
 			task->tk_garb_retry--;
-			dprintk("RPC: %4d call_verify: retry garbled creds\n",
-							task->tk_pid);
+			dprintk("RPC: %5u %s: retry garbled creds\n",
+					task->tk_pid, __func__);
 			task->tk_action = call_bind;
-			return NULL;
+			goto out_retry;
 		case RPC_AUTH_TOOWEAK:
-			printk(KERN_NOTICE "call_verify: server requires stronger "
-			       "authentication.\n");
+			printk(KERN_NOTICE "call_verify: server %s requires stronger "
+			       "authentication.\n", task->tk_client->cl_server);
 			break;
 		default:
-			printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
+			dprintk("RPC: %5u %s: unknown auth error: %x\n",
+					task->tk_pid, __func__, n);
 			error = -EIO;
 		}
-		dprintk("RPC: %4d call_verify: call rejected %d\n",
-						task->tk_pid, n);
+		dprintk("RPC: %5u %s: call rejected %d\n",
+				task->tk_pid, __func__, n);
 		goto out_err;
 	}
 	if (!(p = rpcauth_checkverf(task, p))) {
-		printk(KERN_WARNING "call_verify: auth check failed\n");
-		goto out_retry;		/* bad verifier, retry */
+		dprintk("RPC: %5u %s: auth check failed\n",
+				task->tk_pid, __func__);
+		goto out_garbage;		/* bad verifier, retry */
 	}
-	len = p - (u32 *)iov->iov_base - 1;
+	len = p - (__be32 *)iov->iov_base - 1;
 	if (len < 0)
 		goto out_overflow;
 	switch ((n = ntohl(*p++))) {
 	case RPC_SUCCESS:
 		return p;
 	case RPC_PROG_UNAVAIL:
-		printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
+		dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
+				task->tk_pid, __func__,
 				(unsigned int)task->tk_client->cl_prog,
 				task->tk_client->cl_server);
-		goto out_eio;
+		error = -EPFNOSUPPORT;
+		goto out_err;
 	case RPC_PROG_MISMATCH:
-		printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
+		dprintk("RPC: %5u %s: program %u, version %u unsupported by "
+				"server %s\n", task->tk_pid, __func__,
 				(unsigned int)task->tk_client->cl_prog,
 				(unsigned int)task->tk_client->cl_vers,
 				task->tk_client->cl_server);
-		goto out_eio;
+		error = -EPROTONOSUPPORT;
+		goto out_err;
 	case RPC_PROC_UNAVAIL:
-		printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
+		dprintk("RPC: %5u %s: proc %p unsupported by program %u, "
+				"version %u on server %s\n",
+				task->tk_pid, __func__,
 				task->tk_msg.rpc_proc,
 				task->tk_client->cl_prog,
 				task->tk_client->cl_vers,
 				task->tk_client->cl_server);
-		goto out_eio;
+		error = -EOPNOTSUPP;
+		goto out_err;
 	case RPC_GARBAGE_ARGS:
-		dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__);
+		dprintk("RPC: %5u %s: server saw garbage\n",
+				task->tk_pid, __func__);
 		break;			/* retry */
 	default:
-		printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
+		dprintk("RPC: %5u %s: server accept status: %x\n",
+				task->tk_pid, __func__, n);
 		/* Also retry */
 	}
 
-out_retry:
+out_garbage:
 	task->tk_client->cl_stats->rpcgarbage++;
 	if (task->tk_garb_retry) {
 		task->tk_garb_retry--;
-		dprintk(KERN_WARNING "RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid);
+		dprintk("RPC: %5u %s: retrying\n",
+				task->tk_pid, __func__);
 		task->tk_action = call_bind;
-		return NULL;
+out_retry:
+		return ERR_PTR(-EAGAIN);
 	}
-	printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
 out_eio:
 	error = -EIO;
 out_err:
 	rpc_exit(task, error);
-	return NULL;
+	dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
+			__func__, error);
+	return ERR_PTR(error);
 out_overflow:
-	printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);
-	goto out_retry;
+	dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
+			__func__);
+	goto out_garbage;
 }
 
-static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj)
+static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj)
 {
 	return 0;
 }
 
-static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj)
+static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj)
 {
 	return 0;
 }
@@ -1132,7 +1482,7 @@ static struct rpc_procinfo rpcproc_null = {
 	.p_decode = rpcproc_decode_null,
 };
 
-int rpc_ping(struct rpc_clnt *clnt, int flags)
+static int rpc_ping(struct rpc_clnt *clnt, int flags)
 {
 	struct rpc_message msg = {
 		.rpc_proc = &rpcproc_null,
@@ -1143,3 +1493,62 @@ int rpc_ping(struct rpc_clnt *clnt, int flags)
 	put_rpccred(msg.rpc_cred);
 	return err;
 }
+
+struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &rpcproc_null,
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_message = &msg,
+		.callback_ops = &rpc_default_ops,
+		.flags = flags,
+	};
+	return rpc_run_task(&task_setup_data);
+}
+EXPORT_SYMBOL_GPL(rpc_call_null);
+
+#ifdef RPC_DEBUG
+void rpc_show_tasks(void)
+{
+	struct rpc_clnt *clnt;
+	struct rpc_task *t;
+
+	spin_lock(&rpc_client_lock);
+	if (list_empty(&all_clients))
+		goto out;
+	printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout "
+		"-rpcwait -action- ---ops--\n");
+	list_for_each_entry(clnt, &all_clients, cl_clients) {
+		if (list_empty(&clnt->cl_tasks))
+			continue;
+		spin_lock(&clnt->cl_lock);
+		list_for_each_entry(t, &clnt->cl_tasks, tk_task) {
+			const char *rpc_waitq = "none";
+			int proc;
+
+			if (t->tk_msg.rpc_proc)
+				proc = t->tk_msg.rpc_proc->p_proc;
+			else
+				proc = -1;
+
+			if (RPC_IS_QUEUED(t))
+				rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq);
+
+			printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n",
+				t->tk_pid, proc,
+				t->tk_flags, t->tk_status,
+				t->tk_client,
+				(t->tk_client ? t->tk_client->cl_prog : 0),
+				t->tk_rqstp, t->tk_timeout,
+				rpc_waitq,
+				t->tk_action, t->tk_ops);
+		}
+		spin_unlock(&clnt->cl_lock);
+	}
+out:
+	spin_unlock(&rpc_client_lock);
+}
+#endif