patch-2.1.32 linux/net/sunrpc/clnt.c

• Lines: 762
• Date: Thu Mar 20 08:09:20 1997
• Orig file: v2.1.31/linux/net/sunrpc/clnt.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/net/sunrpc/clnt.c linux/net/sunrpc/clnt.c
@@ -0,0 +1,761 @@
+/*
+ *  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 reconnect handling (when finished).
+ *  -	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 <linux/config.h>
+#include <linux/module.h>
+
+#include <asm/system.h>
+#include <asm/segment.h>
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/malloc.h>
+#include <linux/in.h>
+
+#include <linux/sunrpc/clnt.h>
+
+
+#define RPC_SLACK_SPACE		1024	/* total overkill */
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_CALL
+#endif
+
+static struct wait_queue *	destroy_wait = NULL;
+
+
+static void	call_bind(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_transmit(struct rpc_task *task);
+static void	call_receive(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_reconnect(struct rpc_task *task);
+static u32 *	call_header(struct rpc_task *task);
+static u32 *	call_verify(struct rpc_task *task);
+
+#define _S(nr)	(1 << ((nr) - 1))
+
+/*
+ * 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, int flavor)
+{
+	struct rpc_version	*version;
+	struct rpc_clnt		*clnt;
+
+	dprintk("RPC: creating %s client for %s (xprt %p)\n",
+			program->name, servname, xprt);
+
+	if (!xprt)
+		return NULL;
+	if (vers>= program->nrvers || !(version = program->version[vers]))
+		return NULL;
+
+	if (!(clnt = (struct rpc_clnt *) rpc_allocate(0, sizeof(*clnt)))) {
+		printk("RPC: out of memory in rpc_create_client\n");
+		return NULL;
+	}
+	memset(clnt, 0, sizeof(*clnt));
+
+	clnt->cl_xprt     = xprt;
+	clnt->cl_procinfo = version->procs;
+	clnt->cl_maxproc  = version->nrprocs;
+	clnt->cl_server   = servname;
+	clnt->cl_protname = program->name;
+	clnt->cl_port     = xprt->addr.sin_port;
+	clnt->cl_prog     = program->number;
+	clnt->cl_vers     = version->number;
+	clnt->cl_prot     = IPPROTO_UDP;
+	clnt->cl_stats    = program->stats;
+	clnt->cl_bindwait = RPC_INIT_WAITQ("bindwait");
+
+	if (!clnt->cl_port)
+		clnt->cl_autobind = 1;
+
+	if (!rpcauth_create(flavor, clnt)) {
+		printk("RPC: Couldn't create auth handle (flavor %d)\n",
+					flavor);
+		rpc_free(clnt);
+		return NULL;
+	}
+	return clnt;
+}
+
+/*
+ * Properly shut down an RPC client, terminating all outstanding
+ * requests.
+ */
+int
+rpc_shutdown_client(struct rpc_clnt *clnt)
+{
+	dprintk("RPC: shutting down %s client for %s\n",
+			clnt->cl_protname, clnt->cl_server);
+	while (clnt->cl_users) {
+		dprintk("sigmask %08lx\n", current->signal);
+		dprintk("users %d\n", clnt->cl_users);
+		clnt->cl_dead = 1;
+		rpc_killall_tasks(clnt);
+		sleep_on(&destroy_wait);
+	}
+	return rpc_destroy_client(clnt);
+}
+
+/*
+ * Delete an RPC client
+ */
+int
+rpc_destroy_client(struct rpc_clnt *clnt)
+{
+	dprintk("RPC: destroying %s client for %s\n",
+			clnt->cl_protname, clnt->cl_server);
+
+	rpcauth_destroy(clnt->cl_auth);
+	if (clnt->cl_xprt) {
+		xprt_destroy(clnt->cl_xprt);
+		clnt->cl_xprt = NULL;
+	}
+	rpc_free(clnt);
+	return 0;
+}
+
+/*
+ * Release an RPC client
+ */
+void
+rpc_release_client(struct rpc_clnt *clnt)
+{
+	dprintk("RPC:      rpc_release_client(%p, %d)\n",
+				clnt, clnt->cl_users);
+	if (--(clnt->cl_users) == 0) {
+		wake_up(&destroy_wait);
+		if (clnt->cl_oneshot || clnt->cl_dead)
+			rpc_destroy_client(clnt);
+	}
+	dprintk("RPC:      rpc_release_client done\n");
+}
+
+/*
+ * Default callback for async RPC calls
+ */
+static void
+rpc_default_callback(struct rpc_task *task)
+{
+	rpc_release_task(task);
+}
+
+/*
+ * New rpc_call implementation
+ */
+int
+rpc_do_call(struct rpc_clnt *clnt, u32 proc, void *argp, void *resp,
+				int flags, rpc_action func, void *data)
+{
+	struct rpc_task	my_task, *task = &my_task;
+	unsigned long	oldmask, sigallow = _S(SIGKILL);
+	int		async, status;
+
+	/* Turn off various signals */
+	if (clnt->cl_intr) {
+		struct sigaction *action = current->sig->action;
+		if (action[SIGINT-1].sa_handler == SIG_DFL)
+			sigallow |= _S(SIGINT);
+		if (action[SIGQUIT-1].sa_handler == SIG_DFL)
+			sigallow |= _S(SIGQUIT);
+	}
+	oldmask = current->blocked;
+	current->blocked |= ~sigallow;
+
+	/* Create/initialize a new RPC task */
+	if ((async = (flags & RPC_TASK_ASYNC)) != 0) {
+		if (!func)
+			func = rpc_default_callback;
+		if (!(task = rpc_new_task(clnt, func, flags))) {
+			current->blocked = oldmask;
+			return -ENOMEM;
+		}
+		task->tk_calldata = data;
+	} else {
+		rpc_init_task(task, clnt, NULL, flags);
+	}
+
+	/* Bind the user cred, set up the call info struct and
+	 * execute the task */
+	if (rpcauth_lookupcred(task) != NULL) {
+		rpc_call_setup(task, proc, argp, resp, 0);
+		rpc_execute(task);
+	} else
+		async = 0;
+
+	if (!async) {
+		status = task->tk_status;
+		rpc_release_task(task);
+	} else
+		status = 0;
+
+	current->blocked = oldmask;
+	return status;
+}
+
+
+void
+rpc_call_setup(struct rpc_task *task, u32 proc,
+				void *argp, void *resp, int flags)
+{
+	task->tk_action = call_bind;
+	task->tk_proc   = proc;
+	task->tk_argp   = argp;
+	task->tk_resp   = resp;
+	task->tk_flags |= flags;
+
+	/* Increment call count */
+	rpcproc_count(task->tk_client, proc)++;
+}
+
+/*
+ * Restart an (async) RPC call. Usually called from within the
+ * exit handler.
+ */
+void
+rpc_restart_call(struct rpc_task *task)
+{
+	if (task->tk_flags & RPC_TASK_KILLED) {
+		rpc_release_task(task);
+		return;
+	}
+	task->tk_action = call_bind;
+	rpcproc_count(task->tk_client, task->tk_proc)++;
+}
+
+/*
+ * 0.	Get the server port number if not yet set
+ */
+static void
+call_bind(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+
+	task->tk_action = call_reserve;
+	task->tk_status = 0;
+	if (!clnt->cl_port)
+		rpc_getport(task, clnt);
+}
+
+/*
+ * 1.	Reserve an RPC call slot
+ */
+static void
+call_reserve(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+
+	dprintk("RPC: %4d call_reserve\n", task->tk_pid);
+	if (!clnt->cl_port) {
+		printk(KERN_NOTICE "%s: couldn't bind to server %s - %s.\n",
+			clnt->cl_protname, clnt->cl_server,
+			clnt->cl_softrtry? "giving up" : "retrying");
+		if (!clnt->cl_softrtry) {
+			rpc_delay(task, 5*HZ);
+			return;
+		}
+		rpc_exit(task, -EIO);
+		return;
+	}
+	if (!rpcauth_uptodatecred(task)) {
+		task->tk_action = call_refresh;
+		return;
+	}
+	task->tk_action  = call_reserveresult;
+	task->tk_timeout = clnt->cl_timeout.to_resrvval;
+	task->tk_status  = 0;
+	clnt->cl_stats->rpccnt++;
+	xprt_reserve(task);
+}
+
+/*
+ * 1b.	Grok the result of xprt_reserve()
+ */
+static void
+call_reserveresult(struct rpc_task *task)
+{
+	dprintk("RPC: %4d call_reserveresult (status %d)\n",
+				task->tk_pid, task->tk_status);
+
+	if (task->tk_status >= 0) {
+		task->tk_action = call_allocate;
+	} else if (task->tk_status == -EAGAIN) {
+		task->tk_timeout = task->tk_client->cl_timeout.to_resrvval;
+		task->tk_status = 0;
+		xprt_reserve(task);
+		return;
+	} else if (task->tk_status == -ETIMEDOUT) {
+		task->tk_action = call_timeout;
+	} else {
+		task->tk_action = NULL;
+	}
+	if (!task->tk_rqstp)
+		rpc_exit(task, -EIO);
+}
+
+/*
+ * 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)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+	unsigned int	bufsiz;
+
+	dprintk("RPC: %4d call_allocate (status %d)\n", 
+				task->tk_pid, task->tk_status);
+	task->tk_action = call_encode;
+	if (task->tk_buffer)
+		return;
+
+	/* FIXME: compute buffer requirements more exactly using
+	 * auth->au_wslack */
+	bufsiz = rpcproc_bufsiz(clnt, task->tk_proc) + RPC_SLACK_SPACE;
+
+	if ((task->tk_buffer = rpc_malloc(task, bufsiz)) != NULL)
+		return;
+
+	if (!signalled()) {
+		xprt_release(task);
+		task->tk_action = call_reserve;
+		rpc_delay(task, HZ);
+		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;
+	unsigned int	bufsiz;
+	kxdrproc_t	encode;
+	int		status;
+	u32		*p;
+
+	dprintk("RPC: %4d call_encode (status %d)\n", 
+				task->tk_pid, task->tk_status);
+
+	task->tk_action = call_transmit;
+
+	/* Default buffer setup */
+	bufsiz = rpcproc_bufsiz(clnt, task->tk_proc)+RPC_SLACK_SPACE;
+	req->rq_svec[0].iov_base = task->tk_buffer;
+	req->rq_svec[0].iov_len  = bufsiz;
+	req->rq_slen		 = 0;
+	req->rq_snr		 = 1;
+	req->rq_rvec[0].iov_base = task->tk_buffer;
+	req->rq_rvec[0].iov_len  = bufsiz;
+	req->rq_rlen		 = bufsiz;
+	req->rq_rnr		 = 1;
+
+	if (task->tk_proc > clnt->cl_maxproc) {
+		printk(KERN_WARNING "%s (vers %d): bad procedure number %d\n",
+			clnt->cl_protname, clnt->cl_vers, task->tk_proc);
+		rpc_exit(task, -EIO);
+		return;
+	}
+
+	/* Encode header and provided arguments */
+	encode = rpcproc_encode(clnt, task->tk_proc);
+	if (!(p = call_header(task))) {
+		rpc_exit(task, -EIO);
+	} else
+	if ((status = encode(req, p, task->tk_argp)) < 0) {
+		printk(KERN_WARNING "%s: can't encode arguments: %d\n",
+				clnt->cl_protname, -status);
+		rpc_exit(task, status);
+	}
+}
+
+/*
+ * 4.	Transmit the RPC request
+ */
+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_receive;
+	task->tk_status = 0;
+	xprt_transmit(task);
+}
+
+/*
+ * 5.	Wait for the RPC reply
+ */
+static void
+call_receive(struct rpc_task *task)
+{
+	dprintk("RPC: %4d call_receive (status %d)\n", 
+				task->tk_pid, task->tk_status);
+
+	/* In case of error, evaluate status */
+	if (task->tk_status < 0) {
+		task->tk_action = call_status;
+		return;
+	}
+
+	/* If we have no decode function, this means we're performing
+	 * a void call (a la lockd message passing). */
+	if (!rpcproc_decode(task->tk_client, task->tk_proc)) {
+		rpc_remove_wait_queue(task); /* remove from xprt_pending */
+		task->tk_action = NULL;
+		return;
+	}
+
+	task->tk_action = call_status;
+	xprt_receive(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;
+	int		status = task->tk_status;
+
+	dprintk("RPC: %4d call_status (status %d)\n", 
+				task->tk_pid, task->tk_status);
+
+	if (status >= 0) {
+		task->tk_action = call_decode;
+	} else if (status == -ETIMEDOUT) {
+		task->tk_action = call_timeout;
+	} else if (status == -EAGAIN) {
+		if (!(req = task->tk_rqstp))
+			task->tk_action = call_reserve;
+		else if (!task->tk_buffer)
+			task->tk_action = call_allocate;
+		else if (req->rq_damaged)
+			task->tk_action = call_encode;
+		else
+			task->tk_action = call_transmit;
+	} else if (status == -ENOTCONN) {
+		task->tk_action = call_reconnect;
+	} else if (status == -ECONNREFUSED && clnt->cl_autobind) {
+		task->tk_action = call_bind;
+		clnt->cl_port = 0;
+	} else {
+		if (clnt->cl_chatty)
+			printk("%s: RPC call returned error %d\n",
+				clnt->cl_protname, -status);
+		task->tk_action = NULL;
+		return;
+	}
+}
+
+/*
+ * 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;
+	struct rpc_rqst	*req = task->tk_rqstp;
+
+	if (req) {
+		struct rpc_timeout *to = &req->rq_timeout;
+
+		if (xprt_adjust_timeout(to)) {
+			dprintk("RPC: %4d call_timeout (minor timeo)\n",
+				task->tk_pid);
+			goto minor_timeout;
+		}
+		if ((to->to_initval <<= 1) > to->to_maxval)
+			to->to_initval = to->to_maxval;
+	}
+
+	dprintk("RPC: %4d call_timeout (major timeo)\n", task->tk_pid);
+	if (clnt->cl_softrtry) {
+		if (clnt->cl_chatty && !task->tk_exit)
+			printk("%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)) {
+		printk("%s: server %s not responding, still trying\n",
+			clnt->cl_protname, clnt->cl_server);
+		task->tk_flags |= RPC_CALL_MAJORSEEN;
+	}
+	if (clnt->cl_autobind)
+		clnt->cl_port = 0;
+
+minor_timeout:
+	if (!clnt->cl_port) {
+		task->tk_action = call_bind;
+	} else if (!req) {
+		task->tk_action = call_reserve;
+	} else if (req->rq_damaged) {
+		task->tk_action = call_encode;
+		clnt->cl_stats->rpcretrans++;
+	} else {
+		task->tk_action = call_transmit;
+		clnt->cl_stats->rpcretrans++;
+	}
+	task->tk_status = 0;
+}
+
+/*
+ * 6b.	Reconnect to the RPC server (TCP case)
+ */
+static void
+call_reconnect(struct rpc_task *task)
+{
+	dprintk("RPC: %4d call_reconnect status %d\n",
+				task->tk_pid, task->tk_status);
+	if (task->tk_status == 0) {
+		task->tk_action = call_status;
+		task->tk_status = -EAGAIN;
+		return;
+	}
+	task->tk_client->cl_stats->netreconn++;
+	xprt_reconnect(task);
+}
+
+/*
+ * 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 = rpcproc_decode(clnt, task->tk_proc);
+	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("%s: server %s OK\n",
+			clnt->cl_protname, clnt->cl_server);
+		task->tk_flags &= ~RPC_CALL_MAJORSEEN;
+	}
+
+	if (task->tk_status < 12) {
+		printk("%s: too small RPC reply size (%d bytes)\n",
+			clnt->cl_protname, task->tk_status);
+		rpc_exit(task, -EIO);
+		return;
+	}
+
+	/* Verify the RPC header */
+	if (!(p = call_verify(task)))
+		return;
+
+	/*
+	 * The following is an NFS-specific hack to cater for setuid
+	 * processes whose uid is mapped to nobody on the server.
+	 */
+	if (task->tk_client->cl_prog == 100003 && ntohl(*p) == NFSERR_PERM) {
+		if (RPC_IS_SETUID(task) && (task->tk_suid_retry)--) {
+			dprintk("RPC: %4d retry squashed uid\n", task->tk_pid);
+			task->tk_flags ^= RPC_CALL_REALUID;
+			task->tk_action = call_encode;
+			return;
+		}
+	}
+
+	task->tk_action = NULL;
+	task->tk_status = decode(req, p, task->tk_resp);
+	dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
+					task->tk_status);
+}
+
+/*
+ * 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)
+{
+	dprintk("RPC: %4d call_refreshresult (status %d)\n", 
+				task->tk_pid, task->tk_status);
+
+	if (task->tk_status < 0) {
+		task->tk_status = -EACCES;
+		task->tk_action = NULL;
+	} else
+		task->tk_action = call_reserve;
+}
+
+/*
+ * 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;
+	u32		*p = task->tk_buffer;
+
+	/* FIXME: check buffer size? */
+	if (xprt->stream)
+		*p++ = 0;		/* fill in later */
+	*p++ = task->tk_rqstp->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_proc);	/* procedure */
+	return rpcauth_marshcred(task, p);
+}
+
+/*
+ * Reply header verification
+ */
+static u32 *
+call_verify(struct rpc_task *task)
+{
+	u32	*p = task->tk_buffer, n;
+
+	p += 1;	/* skip XID */
+
+	if ((n = ntohl(*p++)) != RPC_REPLY) {
+		printk("call_verify: not an RPC reply: %x\n", n);
+		goto garbage;
+	}
+	if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
+		int	error = -EACCES;
+
+		if ((n = ntohl(*p++)) != RPC_AUTH_ERROR) {
+			printk("call_verify: RPC call rejected: %x\n", n);
+		} else
+		switch ((n = ntohl(*p++))) {
+		case RPC_AUTH_REJECTEDCRED:
+		case RPC_AUTH_REJECTEDVERF:
+			if (!task->tk_cred_retry--)
+				break;
+			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;
+			dprintk("RPC: %4d call_verify: retry garbled creds\n",
+							task->tk_pid);
+			task->tk_action = call_encode;
+			return NULL;
+		case RPC_AUTH_TOOWEAK:
+			printk("call_verify: server requires stronger "
+			       "authentication.\n");
+		default:
+			printk("call_verify: unknown auth error: %x\n", n);
+			error = -EIO;
+		}
+		dprintk("RPC: %4d call_verify: call rejected %d\n",
+						task->tk_pid, n);
+		rpc_exit(task, error);
+		return NULL;
+	}
+	if (!(p = rpcauth_checkverf(task, p)))
+		goto garbage;		/* bad verifier, retry */
+	switch ((n = ntohl(*p++))) {
+	case RPC_SUCCESS:
+		return p;
+	case RPC_GARBAGE_ARGS:
+		break;			/* retry */
+	default:
+		printk("call_verify: server accept status: %x\n", n);
+		/* Also retry */
+	}
+
+garbage:
+	dprintk("RPC: %4d call_verify: server saw garbage\n", task->tk_pid);
+	task->tk_client->cl_stats->rpcgarbage++;
+	if (0 && task->tk_garb_retry--) {
+		task->tk_action = call_encode;
+		return NULL;
+	}
+	rpc_exit(task, -EIO);
+	return NULL;
+}
+
+#ifdef MODULE
+int
+init_module(void)
+{
+#ifdef RPC_DEBUG
+	rpc_register_sysctl();
+#endif
+	rpcstat_init();
+	return 0;
+}
+
+void
+cleanup_module(void)
+{
+#ifdef RPC_DEBUG
+	rpc_unregister_sysctl();
+#endif
+	rpcstat_exit();
+}
+#endif