Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1085 insertions, 0 deletions

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
new file mode 100644
index 00000000000..02bc029d46f
--- /dev/null
+++ b/net/sunrpc/clnt.c
@@ -0,0 +1,1085 @@
+/*
+ *  linux/net/sunrpc/rpcclnt.c
+ *
+ *  This file contains the high-level RPC interface.
+ *  It is modeled as a finite state machine to support both synchronous
+ *  and asynchronous requests.
+ *
+ *  -	RPC header generation and argument serialization.
+ *  -	Credential refresh.
+ *  -	TCP connect handling.
+ *  -	Retry of operation when it is suspected the operation failed because
+ *	of uid squashing on the server, or when the credentials were stale
+ *	and need to be refreshed, or when a packet was damaged in transit.
+ *	This may be have to be moved to the VFS layer.
+ *
+ *  NB: BSD uses a more intelligent approach to guessing when a request
+ *  or reply has been lost by keeping the RTO estimate for each procedure.
+ *  We currently make do with a constant timeout value.
+ *
+ *  Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
+ *  Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <asm/system.h>
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/utsname.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+
+#include <linux/nfs.h>
+
+
+#define RPC_SLACK_SPACE		(1024)	/* total overkill */
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_CALL
+#endif
+
+static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
+
+
+static void	call_start(struct rpc_task *task);
+static void	call_reserve(struct rpc_task *task);
+static void	call_reserveresult(struct rpc_task *task);
+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_transmit(struct rpc_task *task);
+static void	call_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 int
+rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
+{
+	static uint32_t clntid;
+	int error;
+
+	if (dir_name == NULL)
+		return 0;
+	for (;;) {
+		snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
+				"%s/clnt%x", dir_name,
+				(unsigned int)clntid++);
+		clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
+		clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
+		if (!IS_ERR(clnt->cl_dentry))
+			return 0;
+		error = PTR_ERR(clnt->cl_dentry);
+		if (error != -EEXIST) {
+			printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
+					clnt->cl_pathname, error);
+			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_create_client(struct rpc_xprt *xprt, char *servname,
+		  struct rpc_program *program, u32 vers,
+		  rpc_authflavor_t flavor)
+{
+	struct rpc_version	*version;
+	struct rpc_clnt		*clnt = NULL;
+	int err;
+	int len;
+
+	dprintk("RPC: creating %s client for %s (xprt %p)\n",
+		program->name, servname, xprt);
+
+	err = -EINVAL;
+	if (!xprt)
+		goto out_err;
+	if (vers >= program->nrvers || !(version = program->version[vers]))
+		goto out_err;
+
+	err = -ENOMEM;
+	clnt = (struct rpc_clnt *) kmalloc(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)
+			clnt->cl_server = buf;
+		else
+			len = sizeof(clnt->cl_inline_name);
+	}
+	strlcpy(clnt->cl_server, servname, 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");
+
+	if (!clnt->cl_port)
+		clnt->cl_autobind = 1;
+
+	clnt->cl_rtt = &clnt->cl_rtt_default;
+	rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
+
+	err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
+	if (err < 0)
+		goto out_no_path;
+
+	err = -ENOMEM;
+	if (!rpcauth_create(flavor, clnt)) {
+		printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
+				flavor);
+		goto out_no_auth;
+	}
+
+	/* save the nodename */
+	clnt->cl_nodelen = strlen(system_utsname.nodename);
+	if (clnt->cl_nodelen > UNX_MAXNODENAME)
+		clnt->cl_nodelen = UNX_MAXNODENAME;
+	memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
+	return clnt;
+
+out_no_auth:
+	rpc_rmdir(clnt->cl_pathname);
+out_no_path:
+	if (clnt->cl_server != clnt->cl_inline_name)
+		kfree(clnt->cl_server);
+	kfree(clnt);
+out_err:
+	return ERR_PTR(err);
+}
+
+/*
+ * This function clones the RPC client structure. It allows us to share the
+ * same transport while varying parameters such as the authentication
+ * flavour.
+ */
+struct rpc_clnt *
+rpc_clone_client(struct rpc_clnt *clnt)
+{
+	struct rpc_clnt *new;
+
+	new = (struct rpc_clnt *)kmalloc(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);
+	if (new->cl_auth)
+		atomic_inc(&new->cl_auth->au_count);
+	return new;
+out_no_clnt:
+	printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
+	return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * 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.
+ */
+int
+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);
+	}
+
+	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();
+	}
+
+	return rpc_destroy_client(clnt);
+}
+
+/*
+ * Delete an RPC client
+ */
+int
+rpc_destroy_client(struct rpc_clnt *clnt)
+{
+	if (!atomic_dec_and_test(&clnt->cl_count))
+		return 1;
+	BUG_ON(atomic_read(&clnt->cl_users) != 0);
+
+	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 (clnt->cl_parent != clnt) {
+		rpc_destroy_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:
+	kfree(clnt);
+	return 0;
+}
+
+/*
+ * Release an RPC client
+ */
+void
+rpc_release_client(struct rpc_clnt *clnt)
+{
+	dprintk("RPC:      rpc_release_client(%p, %d)\n",
+				clnt, atomic_read(&clnt->cl_users));
+
+	if (!atomic_dec_and_test(&clnt->cl_users))
+		return;
+	wake_up(&destroy_wait);
+	if (clnt->cl_oneshot || clnt->cl_dead)
+		rpc_destroy_client(clnt);
+}
+
+/*
+ * Default callback for async RPC calls
+ */
+static void
+rpc_default_callback(struct rpc_task *task)
+{
+}
+
+/*
+ *	Export the signal mask handling for aysnchronous code that
+ *	sleeps on RPC calls
+ */
+ 
+void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
+{
+	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);
+}
+
+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);
+}
+
+/*
+ * New rpc_call implementation
+ */
+int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
+{
+	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);
+
+	rpc_clnt_sigmask(clnt, &oldset);		
+
+	status = -ENOMEM;
+	task = rpc_new_task(clnt, NULL, flags);
+	if (task == NULL)
+		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);
+	}
+
+out:
+	rpc_clnt_sigunmask(clnt, &oldset);		
+
+	return status;
+}
+
+/*
+ * New rpc_call implementation
+ */
+int
+rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
+	       rpc_action callback, 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;
+
+	rpc_call_setup(task, msg, 0);
+
+	/* 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);
+
+out:
+	rpc_clnt_sigunmask(clnt, &oldset);		
+
+	return status;
+}
+
+
+void
+rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
+{
+	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);
+
+	if (task->tk_status == 0)
+		task->tk_action = call_start;
+	else
+		task->tk_action = NULL;
+}
+
+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);
+}
+
+/*
+ * Return size of largest payload RPC client can support, in bytes
+ *
+ * For stream transports, this is one RPC record fragment (see RFC
+ * 1831), as we don't support multi-record requests yet.  For datagram
+ * transports, this is the size of an IP packet minus the IP, UDP, and
+ * RPC header sizes.
+ */
+size_t rpc_max_payload(struct rpc_clnt *clnt)
+{
+	return clnt->cl_xprt->max_payload;
+}
+EXPORT_SYMBOL(rpc_max_payload);
+
+/*
+ * Restart an (async) RPC call. Usually called from within the
+ * exit handler.
+ */
+void
+rpc_restart_call(struct rpc_task *task)
+{
+	if (RPC_ASSASSINATED(task))
+		return;
+
+	task->tk_action = call_start;
+}
+
+/*
+ * 0.  Initial state
+ *
+ *     Other FSM states can be visited zero or more times, but
+ *     this state is visited exactly once for each RPC.
+ */
+static void
+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"));
+
+	/* Increment call count */
+	task->tk_msg.rpc_proc->p_count++;
+	clnt->cl_stats->rpccnt++;
+	task->tk_action = call_reserve;
+}
+
+/*
+ * 1.	Reserve an RPC call slot
+ */
+static void
+call_reserve(struct rpc_task *task)
+{
+	dprintk("RPC: %4d call_reserve\n", task->tk_pid);
+
+	if (!rpcauth_uptodatecred(task)) {
+		task->tk_action = call_refresh;
+		return;
+	}
+
+	task->tk_status  = 0;
+	task->tk_action  = call_reserveresult;
+	xprt_reserve(task);
+}
+
+/*
+ * 1b.	Grok the result of xprt_reserve()
+ */
+static void
+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);
+
+	/*
+	 * After a call to xprt_reserve(), we must have either
+	 * a request slot or else an error status.
+	 */
+	task->tk_status = 0;
+	if (status >= 0) {
+		if (task->tk_rqstp) {
+			task->tk_action = call_allocate;
+			return;
+		}
+
+		printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
+				__FUNCTION__, status);
+		rpc_exit(task, -EIO);
+		return;
+	}
+
+	/*
+	 * Even though there was an error, we may have acquired
+	 * a request slot somehow.  Make sure not to leak it.
+	 */
+	if (task->tk_rqstp) {
+		printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
+				__FUNCTION__, status);
+		xprt_release(task);
+	}
+
+	switch (status) {
+	case -EAGAIN:	/* woken up; retry */
+		task->tk_action = call_reserve;
+		return;
+	case -EIO:	/* probably a shutdown */
+		break;
+	default:
+		printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
+				__FUNCTION__, status);
+		break;
+	}
+	rpc_exit(task, status);
+}
+
+/*
+ * 2.	Allocate the buffer. For details, see sched.c:rpc_malloc.
+ *	(Note: buffer memory is freed in rpc_task_release).
+ */
+static void
+call_allocate(struct rpc_task *task)
+{
+	unsigned int	bufsiz;
+
+	dprintk("RPC: %4d call_allocate (status %d)\n", 
+				task->tk_pid, task->tk_status);
+	task->tk_action = call_bind;
+	if (task->tk_buffer)
+		return;
+
+	/* FIXME: compute buffer requirements more exactly using
+	 * auth->au_wslack */
+	bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
+
+	if (rpc_malloc(task, bufsiz << 1) != 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;
+		rpc_delay(task, HZ>>4);
+		return;
+	}
+
+	rpc_exit(task, -ERESTARTSYS);
+}
+
+/*
+ * 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;
+
+	/* Encode header and provided arguments */
+	encode = task->tk_msg.rpc_proc->p_encode;
+	if (!(p = call_header(task))) {
+		printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
+		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);
+	}
+}
+
+/*
+ * 4.	Get the server port number if not yet set
+ */
+static void
+call_bind(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+	struct rpc_xprt *xprt = clnt->cl_xprt;
+
+	dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
+			xprt, (xprt_connected(xprt) ? "is" : "is not"));
+
+	task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
+
+	if (!clnt->cl_port) {
+		task->tk_action = call_connect;
+		task->tk_timeout = RPC_CONNECT_TIMEOUT;
+		rpc_getport(task, clnt);
+	}
+}
+
+/*
+ * 4a.	Connect to the RPC server (TCP case)
+ */
+static void
+call_connect(struct rpc_task *task)
+{
+	struct rpc_clnt *clnt = task->tk_client;
+
+	dprintk("RPC: %4d call_connect status %d\n",
+				task->tk_pid, task->tk_status);
+
+	if (xprt_connected(clnt->cl_xprt)) {
+		task->tk_action = call_transmit;
+		return;
+	}
+	task->tk_action = call_connect_status;
+	if (task->tk_status < 0)
+		return;
+	xprt_connect(task);
+}
+
+/*
+ * 4b. Sort out connect result
+ */
+static void
+call_connect_status(struct rpc_task *task)
+{
+	struct rpc_clnt *clnt = task->tk_client;
+	int status = task->tk_status;
+
+	task->tk_status = 0;
+	if (status >= 0) {
+		clnt->cl_stats->netreconn++;
+		task->tk_action = call_transmit;
+		return;
+	}
+
+	/* Something failed: we may have to rebind */
+	if (clnt->cl_autobind)
+		clnt->cl_port = 0;
+	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);
+	}
+}
+
+/*
+ * 5.	Transmit the RPC request, and wait for reply
+ */
+static void
+call_transmit(struct rpc_task *task)
+{
+	dprintk("RPC: %4d call_transmit (status %d)\n", 
+				task->tk_pid, task->tk_status);
+
+	task->tk_action = call_status;
+	if (task->tk_status < 0)
+		return;
+	task->tk_status = xprt_prepare_transmit(task);
+	if (task->tk_status != 0)
+		return;
+	/* Encode here so that rpcsec_gss can use correct sequence number. */
+	if (!task->tk_rqstp->rq_bytes_sent)
+		call_encode(task);
+	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);
+	}
+}
+
+/*
+ * 6.	Sort out the RPC call status
+ */
+static void
+call_status(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+	struct rpc_rqst	*req = task->tk_rqstp;
+	int		status;
+
+	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);
+
+	status = task->tk_status;
+	if (status >= 0) {
+		task->tk_action = call_decode;
+		return;
+	}
+
+	task->tk_status = 0;
+	switch(status) {
+	case -ETIMEDOUT:
+		task->tk_action = call_timeout;
+		break;
+	case -ECONNREFUSED:
+	case -ENOTCONN:
+		req->rq_bytes_sent = 0;
+		if (clnt->cl_autobind)
+			clnt->cl_port = 0;
+		task->tk_action = call_bind;
+		break;
+	case -EAGAIN:
+		task->tk_action = call_transmit;
+		break;
+	case -EIO:
+		/* shutdown or soft timeout */
+		rpc_exit(task, status);
+		break;
+	default:
+		if (clnt->cl_chatty)
+			printk("%s: RPC call returned error %d\n",
+			       clnt->cl_protname, -status);
+		rpc_exit(task, status);
+		break;
+	}
+}
+
+/*
+ * 6a.	Handle RPC timeout
+ * 	We do not release the request slot, so we keep using the
+ *	same XID for all retransmits.
+ */
+static void
+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);
+		goto retry;
+	}
+
+	dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
+	if (RPC_IS_SOFT(task)) {
+		if (clnt->cl_chatty)
+			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)) {
+		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;
+
+retry:
+	clnt->cl_stats->rpcretrans++;
+	task->tk_action = call_bind;
+	task->tk_status = 0;
+}
+
+/*
+ * 7.	Decode the RPC reply
+ */
+static void
+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;
+
+	dprintk("RPC: %4d call_decode (status %d)\n", 
+				task->tk_pid, task->tk_status);
+
+	if (clnt->cl_chatty && (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;
+	}
+
+	if (task->tk_status < 12) {
+		if (!RPC_IS_SOFT(task)) {
+			task->tk_action = call_bind;
+			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;
+	}
+
+	req->rq_rcv_buf.len = req->rq_private_buf.len;
+
+	/* Check that the softirq receive buffer is valid */
+	WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
+				sizeof(req->rq_rcv_buf)) != 0);
+
+	/* Verify the RPC header */
+	if (!(p = call_verify(task))) {
+		if (task->tk_action == NULL)
+			return;
+		goto out_retry;
+	}
+
+	task->tk_action = NULL;
+
+	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);
+	return;
+out_retry:
+	req->rq_received = req->rq_private_buf.len = 0;
+	task->tk_status = 0;
+}
+
+/*
+ * 8.	Refresh the credentials if rejected by the server
+ */
+static void
+call_refresh(struct rpc_task *task)
+{
+	dprintk("RPC: %4d call_refresh\n", task->tk_pid);
+
+	xprt_release(task);	/* Must do to obtain new XID */
+	task->tk_action = call_refreshresult;
+	task->tk_status = 0;
+	task->tk_client->cl_stats->rpcauthrefresh++;
+	rpcauth_refreshcred(task);
+}
+
+/*
+ * 8a.	Process the results of a credential refresh
+ */
+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);
+
+	task->tk_status = 0;
+	task->tk_action = call_reserve;
+	if (status >= 0 && rpcauth_uptodatecred(task))
+		return;
+	if (status == -EACCES) {
+		rpc_exit(task, -EACCES);
+		return;
+	}
+	task->tk_action = call_refresh;
+	if (status != -ETIMEDOUT)
+		rpc_delay(task, 3*HZ);
+	return;
+}
+
+/*
+ * Call header serialization
+ */
+static u32 *
+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;
+
+	/* FIXME: check buffer size? */
+	if (xprt->stream)
+		*p++ = 0;		/* fill in later */
+	*p++ = req->rq_xid;		/* XID */
+	*p++ = htonl(RPC_CALL);		/* CALL */
+	*p++ = htonl(RPC_VERSION);	/* RPC version */
+	*p++ = htonl(clnt->cl_prog);	/* program number */
+	*p++ = htonl(clnt->cl_vers);	/* program version */
+	*p++ = htonl(task->tk_msg.rpc_proc->p_proc);	/* procedure */
+	return rpcauth_marshcred(task, p);
+}
+
+/*
+ * Reply header verification
+ */
+static u32 *
+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;
+	int error = -EACCES;
+
+	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;
+	}
+	if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
+		if (--len < 0)
+			goto out_overflow;
+		switch ((n = ntohl(*p++))) {
+			case RPC_AUTH_ERROR:
+				break;
+			case RPC_MISMATCH:
+				printk(KERN_WARNING "%s: RPC call version mismatch!\n", __FUNCTION__);
+				goto out_eio;
+			default:
+				printk(KERN_WARNING "%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n);
+				goto out_eio;
+		}
+		if (--len < 0)
+			goto out_overflow;
+		switch ((n = ntohl(*p++))) {
+		case RPC_AUTH_REJECTEDCRED:
+		case RPC_AUTH_REJECTEDVERF:
+		case RPCSEC_GSS_CREDPROBLEM:
+		case RPCSEC_GSS_CTXPROBLEM:
+			if (!task->tk_cred_retry)
+				break;
+			task->tk_cred_retry--;
+			dprintk("RPC: %4d call_verify: retry stale creds\n",
+							task->tk_pid);
+			rpcauth_invalcred(task);
+			task->tk_action = call_refresh;
+			return NULL;
+		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);
+			task->tk_action = call_bind;
+			return NULL;
+		case RPC_AUTH_TOOWEAK:
+			printk(KERN_NOTICE "call_verify: server requires stronger "
+			       "authentication.\n");
+			break;
+		default:
+			printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
+			error = -EIO;
+		}
+		dprintk("RPC: %4d call_verify: call rejected %d\n",
+						task->tk_pid, 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 */
+	}
+	len = p - (u32 *)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",
+				(unsigned int)task->tk_client->cl_prog,
+				task->tk_client->cl_server);
+		goto out_eio;
+	case RPC_PROG_MISMATCH:
+		printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
+				(unsigned int)task->tk_client->cl_prog,
+				(unsigned int)task->tk_client->cl_vers,
+				task->tk_client->cl_server);
+		goto out_eio;
+	case RPC_PROC_UNAVAIL:
+		printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
+				task->tk_msg.rpc_proc,
+				task->tk_client->cl_prog,
+				task->tk_client->cl_vers,
+				task->tk_client->cl_server);
+		goto out_eio;
+	case RPC_GARBAGE_ARGS:
+		dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__);
+		break;			/* retry */
+	default:
+		printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
+		/* Also retry */
+	}
+
+out_retry:
+	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);
+		task->tk_action = call_bind;
+		return NULL;
+	}
+	printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
+out_eio:
+	error = -EIO;
+out_err:
+	rpc_exit(task, error);
+	return NULL;
+out_overflow:
+	printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);
+	goto out_retry;
+}