cpumask: make cpumask_of_cpu_map generic
[linux-2.6/mini2440.git] / net / sunrpc / clnt.c
blob76739e928d0da5ff99b748ac61538e2bfc03fbf4
1 /*
2 * linux/net/sunrpc/clnt.c
4 * This file contains the high-level RPC interface.
5 * It is modeled as a finite state machine to support both synchronous
6 * and asynchronous requests.
8 * - RPC header generation and argument serialization.
9 * - Credential refresh.
10 * - TCP connect handling.
11 * - Retry of operation when it is suspected the operation failed because
12 * of uid squashing on the server, or when the credentials were stale
13 * and need to be refreshed, or when a packet was damaged in transit.
14 * This may be have to be moved to the VFS layer.
16 * NB: BSD uses a more intelligent approach to guessing when a request
17 * or reply has been lost by keeping the RTO estimate for each procedure.
18 * We currently make do with a constant timeout value.
20 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
21 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
24 #include <asm/system.h>
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/kallsyms.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/smp_lock.h>
32 #include <linux/utsname.h>
33 #include <linux/workqueue.h>
34 #include <linux/in6.h>
36 #include <linux/sunrpc/clnt.h>
37 #include <linux/sunrpc/rpc_pipe_fs.h>
38 #include <linux/sunrpc/metrics.h>
41 #ifdef RPC_DEBUG
42 # define RPCDBG_FACILITY RPCDBG_CALL
43 #endif
45 #define dprint_status(t) \
46 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
47 __func__, t->tk_status)
50 * All RPC clients are linked into this list
52 static LIST_HEAD(all_clients);
53 static DEFINE_SPINLOCK(rpc_client_lock);
55 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
58 static void call_start(struct rpc_task *task);
59 static void call_reserve(struct rpc_task *task);
60 static void call_reserveresult(struct rpc_task *task);
61 static void call_allocate(struct rpc_task *task);
62 static void call_decode(struct rpc_task *task);
63 static void call_bind(struct rpc_task *task);
64 static void call_bind_status(struct rpc_task *task);
65 static void call_transmit(struct rpc_task *task);
66 static void call_status(struct rpc_task *task);
67 static void call_transmit_status(struct rpc_task *task);
68 static void call_refresh(struct rpc_task *task);
69 static void call_refreshresult(struct rpc_task *task);
70 static void call_timeout(struct rpc_task *task);
71 static void call_connect(struct rpc_task *task);
72 static void call_connect_status(struct rpc_task *task);
74 static __be32 *rpc_encode_header(struct rpc_task *task);
75 static __be32 *rpc_verify_header(struct rpc_task *task);
76 static int rpc_ping(struct rpc_clnt *clnt, int flags);
78 static void rpc_register_client(struct rpc_clnt *clnt)
80 spin_lock(&rpc_client_lock);
81 list_add(&clnt->cl_clients, &all_clients);
82 spin_unlock(&rpc_client_lock);
85 static void rpc_unregister_client(struct rpc_clnt *clnt)
87 spin_lock(&rpc_client_lock);
88 list_del(&clnt->cl_clients);
89 spin_unlock(&rpc_client_lock);
92 static int
93 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
95 static uint32_t clntid;
96 int error;
98 clnt->cl_vfsmnt = ERR_PTR(-ENOENT);
99 clnt->cl_dentry = ERR_PTR(-ENOENT);
100 if (dir_name == NULL)
101 return 0;
103 clnt->cl_vfsmnt = rpc_get_mount();
104 if (IS_ERR(clnt->cl_vfsmnt))
105 return PTR_ERR(clnt->cl_vfsmnt);
107 for (;;) {
108 snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
109 "%s/clnt%x", dir_name,
110 (unsigned int)clntid++);
111 clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
112 clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
113 if (!IS_ERR(clnt->cl_dentry))
114 return 0;
115 error = PTR_ERR(clnt->cl_dentry);
116 if (error != -EEXIST) {
117 printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
118 clnt->cl_pathname, error);
119 rpc_put_mount();
120 return error;
125 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
127 struct rpc_program *program = args->program;
128 struct rpc_version *version;
129 struct rpc_clnt *clnt = NULL;
130 struct rpc_auth *auth;
131 int err;
132 size_t len;
134 /* sanity check the name before trying to print it */
135 err = -EINVAL;
136 len = strlen(args->servername);
137 if (len > RPC_MAXNETNAMELEN)
138 goto out_no_rpciod;
139 len++;
141 dprintk("RPC: creating %s client for %s (xprt %p)\n",
142 program->name, args->servername, xprt);
144 err = rpciod_up();
145 if (err)
146 goto out_no_rpciod;
147 err = -EINVAL;
148 if (!xprt)
149 goto out_no_xprt;
151 if (args->version >= program->nrvers)
152 goto out_err;
153 version = program->version[args->version];
154 if (version == NULL)
155 goto out_err;
157 err = -ENOMEM;
158 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
159 if (!clnt)
160 goto out_err;
161 clnt->cl_parent = clnt;
163 clnt->cl_server = clnt->cl_inline_name;
164 if (len > sizeof(clnt->cl_inline_name)) {
165 char *buf = kmalloc(len, GFP_KERNEL);
166 if (buf != NULL)
167 clnt->cl_server = buf;
168 else
169 len = sizeof(clnt->cl_inline_name);
171 strlcpy(clnt->cl_server, args->servername, len);
173 clnt->cl_xprt = xprt;
174 clnt->cl_procinfo = version->procs;
175 clnt->cl_maxproc = version->nrprocs;
176 clnt->cl_protname = program->name;
177 clnt->cl_prog = program->number;
178 clnt->cl_vers = version->number;
179 clnt->cl_stats = program->stats;
180 clnt->cl_metrics = rpc_alloc_iostats(clnt);
181 err = -ENOMEM;
182 if (clnt->cl_metrics == NULL)
183 goto out_no_stats;
184 clnt->cl_program = program;
185 INIT_LIST_HEAD(&clnt->cl_tasks);
186 spin_lock_init(&clnt->cl_lock);
188 if (!xprt_bound(clnt->cl_xprt))
189 clnt->cl_autobind = 1;
191 clnt->cl_timeout = xprt->timeout;
192 if (args->timeout != NULL) {
193 memcpy(&clnt->cl_timeout_default, args->timeout,
194 sizeof(clnt->cl_timeout_default));
195 clnt->cl_timeout = &clnt->cl_timeout_default;
198 clnt->cl_rtt = &clnt->cl_rtt_default;
199 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
201 kref_init(&clnt->cl_kref);
203 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
204 if (err < 0)
205 goto out_no_path;
207 auth = rpcauth_create(args->authflavor, clnt);
208 if (IS_ERR(auth)) {
209 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
210 args->authflavor);
211 err = PTR_ERR(auth);
212 goto out_no_auth;
215 /* save the nodename */
216 clnt->cl_nodelen = strlen(utsname()->nodename);
217 if (clnt->cl_nodelen > UNX_MAXNODENAME)
218 clnt->cl_nodelen = UNX_MAXNODENAME;
219 memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen);
220 rpc_register_client(clnt);
221 return clnt;
223 out_no_auth:
224 if (!IS_ERR(clnt->cl_dentry)) {
225 rpc_rmdir(clnt->cl_dentry);
226 rpc_put_mount();
228 out_no_path:
229 rpc_free_iostats(clnt->cl_metrics);
230 out_no_stats:
231 if (clnt->cl_server != clnt->cl_inline_name)
232 kfree(clnt->cl_server);
233 kfree(clnt);
234 out_err:
235 xprt_put(xprt);
236 out_no_xprt:
237 rpciod_down();
238 out_no_rpciod:
239 return ERR_PTR(err);
243 * rpc_create - create an RPC client and transport with one call
244 * @args: rpc_clnt create argument structure
246 * Creates and initializes an RPC transport and an RPC client.
248 * It can ping the server in order to determine if it is up, and to see if
249 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
250 * this behavior so asynchronous tasks can also use rpc_create.
252 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
254 struct rpc_xprt *xprt;
255 struct rpc_clnt *clnt;
256 struct xprt_create xprtargs = {
257 .ident = args->protocol,
258 .srcaddr = args->saddress,
259 .dstaddr = args->address,
260 .addrlen = args->addrsize,
262 char servername[48];
265 * If the caller chooses not to specify a hostname, whip
266 * up a string representation of the passed-in address.
268 if (args->servername == NULL) {
269 servername[0] = '\0';
270 switch (args->address->sa_family) {
271 case AF_INET: {
272 struct sockaddr_in *sin =
273 (struct sockaddr_in *)args->address;
274 snprintf(servername, sizeof(servername), NIPQUAD_FMT,
275 NIPQUAD(sin->sin_addr.s_addr));
276 break;
278 case AF_INET6: {
279 struct sockaddr_in6 *sin =
280 (struct sockaddr_in6 *)args->address;
281 snprintf(servername, sizeof(servername), NIP6_FMT,
282 NIP6(sin->sin6_addr));
283 break;
285 default:
286 /* caller wants default server name, but
287 * address family isn't recognized. */
288 return ERR_PTR(-EINVAL);
290 args->servername = servername;
293 xprt = xprt_create_transport(&xprtargs);
294 if (IS_ERR(xprt))
295 return (struct rpc_clnt *)xprt;
298 * By default, kernel RPC client connects from a reserved port.
299 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
300 * but it is always enabled for rpciod, which handles the connect
301 * operation.
303 xprt->resvport = 1;
304 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
305 xprt->resvport = 0;
307 clnt = rpc_new_client(args, xprt);
308 if (IS_ERR(clnt))
309 return clnt;
311 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
312 int err = rpc_ping(clnt, RPC_TASK_SOFT);
313 if (err != 0) {
314 rpc_shutdown_client(clnt);
315 return ERR_PTR(err);
319 clnt->cl_softrtry = 1;
320 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
321 clnt->cl_softrtry = 0;
323 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
324 clnt->cl_autobind = 1;
325 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
326 clnt->cl_discrtry = 1;
327 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
328 clnt->cl_chatty = 1;
330 return clnt;
332 EXPORT_SYMBOL_GPL(rpc_create);
335 * This function clones the RPC client structure. It allows us to share the
336 * same transport while varying parameters such as the authentication
337 * flavour.
339 struct rpc_clnt *
340 rpc_clone_client(struct rpc_clnt *clnt)
342 struct rpc_clnt *new;
343 int err = -ENOMEM;
345 new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
346 if (!new)
347 goto out_no_clnt;
348 new->cl_parent = clnt;
349 /* Turn off autobind on clones */
350 new->cl_autobind = 0;
351 INIT_LIST_HEAD(&new->cl_tasks);
352 spin_lock_init(&new->cl_lock);
353 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval);
354 new->cl_metrics = rpc_alloc_iostats(clnt);
355 if (new->cl_metrics == NULL)
356 goto out_no_stats;
357 kref_init(&new->cl_kref);
358 err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
359 if (err != 0)
360 goto out_no_path;
361 if (new->cl_auth)
362 atomic_inc(&new->cl_auth->au_count);
363 xprt_get(clnt->cl_xprt);
364 kref_get(&clnt->cl_kref);
365 rpc_register_client(new);
366 rpciod_up();
367 return new;
368 out_no_path:
369 rpc_free_iostats(new->cl_metrics);
370 out_no_stats:
371 kfree(new);
372 out_no_clnt:
373 dprintk("RPC: %s: returned error %d\n", __func__, err);
374 return ERR_PTR(err);
376 EXPORT_SYMBOL_GPL(rpc_clone_client);
379 * Properly shut down an RPC client, terminating all outstanding
380 * requests.
382 void rpc_shutdown_client(struct rpc_clnt *clnt)
384 dprintk("RPC: shutting down %s client for %s\n",
385 clnt->cl_protname, clnt->cl_server);
387 while (!list_empty(&clnt->cl_tasks)) {
388 rpc_killall_tasks(clnt);
389 wait_event_timeout(destroy_wait,
390 list_empty(&clnt->cl_tasks), 1*HZ);
393 rpc_release_client(clnt);
395 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
398 * Free an RPC client
400 static void
401 rpc_free_client(struct kref *kref)
403 struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
405 dprintk("RPC: destroying %s client for %s\n",
406 clnt->cl_protname, clnt->cl_server);
407 if (!IS_ERR(clnt->cl_dentry)) {
408 rpc_rmdir(clnt->cl_dentry);
409 rpc_put_mount();
411 if (clnt->cl_parent != clnt) {
412 rpc_release_client(clnt->cl_parent);
413 goto out_free;
415 if (clnt->cl_server != clnt->cl_inline_name)
416 kfree(clnt->cl_server);
417 out_free:
418 rpc_unregister_client(clnt);
419 rpc_free_iostats(clnt->cl_metrics);
420 clnt->cl_metrics = NULL;
421 xprt_put(clnt->cl_xprt);
422 rpciod_down();
423 kfree(clnt);
427 * Free an RPC client
429 static void
430 rpc_free_auth(struct kref *kref)
432 struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
434 if (clnt->cl_auth == NULL) {
435 rpc_free_client(kref);
436 return;
440 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
441 * release remaining GSS contexts. This mechanism ensures
442 * that it can do so safely.
444 kref_init(kref);
445 rpcauth_release(clnt->cl_auth);
446 clnt->cl_auth = NULL;
447 kref_put(kref, rpc_free_client);
451 * Release reference to the RPC client
453 void
454 rpc_release_client(struct rpc_clnt *clnt)
456 dprintk("RPC: rpc_release_client(%p)\n", clnt);
458 if (list_empty(&clnt->cl_tasks))
459 wake_up(&destroy_wait);
460 kref_put(&clnt->cl_kref, rpc_free_auth);
464 * rpc_bind_new_program - bind a new RPC program to an existing client
465 * @old: old rpc_client
466 * @program: rpc program to set
467 * @vers: rpc program version
469 * Clones the rpc client and sets up a new RPC program. This is mainly
470 * of use for enabling different RPC programs to share the same transport.
471 * The Sun NFSv2/v3 ACL protocol can do this.
473 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
474 struct rpc_program *program,
475 u32 vers)
477 struct rpc_clnt *clnt;
478 struct rpc_version *version;
479 int err;
481 BUG_ON(vers >= program->nrvers || !program->version[vers]);
482 version = program->version[vers];
483 clnt = rpc_clone_client(old);
484 if (IS_ERR(clnt))
485 goto out;
486 clnt->cl_procinfo = version->procs;
487 clnt->cl_maxproc = version->nrprocs;
488 clnt->cl_protname = program->name;
489 clnt->cl_prog = program->number;
490 clnt->cl_vers = version->number;
491 clnt->cl_stats = program->stats;
492 err = rpc_ping(clnt, RPC_TASK_SOFT);
493 if (err != 0) {
494 rpc_shutdown_client(clnt);
495 clnt = ERR_PTR(err);
497 out:
498 return clnt;
500 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
503 * Default callback for async RPC calls
505 static void
506 rpc_default_callback(struct rpc_task *task, void *data)
510 static const struct rpc_call_ops rpc_default_ops = {
511 .rpc_call_done = rpc_default_callback,
515 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
516 * @task_setup_data: pointer to task initialisation data
518 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
520 struct rpc_task *task, *ret;
522 task = rpc_new_task(task_setup_data);
523 if (task == NULL) {
524 rpc_release_calldata(task_setup_data->callback_ops,
525 task_setup_data->callback_data);
526 ret = ERR_PTR(-ENOMEM);
527 goto out;
530 if (task->tk_status != 0) {
531 ret = ERR_PTR(task->tk_status);
532 rpc_put_task(task);
533 goto out;
535 atomic_inc(&task->tk_count);
536 rpc_execute(task);
537 ret = task;
538 out:
539 return ret;
541 EXPORT_SYMBOL_GPL(rpc_run_task);
544 * rpc_call_sync - Perform a synchronous RPC call
545 * @clnt: pointer to RPC client
546 * @msg: RPC call parameters
547 * @flags: RPC call flags
549 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
551 struct rpc_task *task;
552 struct rpc_task_setup task_setup_data = {
553 .rpc_client = clnt,
554 .rpc_message = msg,
555 .callback_ops = &rpc_default_ops,
556 .flags = flags,
558 int status;
560 BUG_ON(flags & RPC_TASK_ASYNC);
562 task = rpc_run_task(&task_setup_data);
563 if (IS_ERR(task))
564 return PTR_ERR(task);
565 status = task->tk_status;
566 rpc_put_task(task);
567 return status;
569 EXPORT_SYMBOL_GPL(rpc_call_sync);
572 * rpc_call_async - Perform an asynchronous RPC call
573 * @clnt: pointer to RPC client
574 * @msg: RPC call parameters
575 * @flags: RPC call flags
576 * @tk_ops: RPC call ops
577 * @data: user call data
580 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
581 const struct rpc_call_ops *tk_ops, void *data)
583 struct rpc_task *task;
584 struct rpc_task_setup task_setup_data = {
585 .rpc_client = clnt,
586 .rpc_message = msg,
587 .callback_ops = tk_ops,
588 .callback_data = data,
589 .flags = flags|RPC_TASK_ASYNC,
592 task = rpc_run_task(&task_setup_data);
593 if (IS_ERR(task))
594 return PTR_ERR(task);
595 rpc_put_task(task);
596 return 0;
598 EXPORT_SYMBOL_GPL(rpc_call_async);
600 void
601 rpc_call_start(struct rpc_task *task)
603 task->tk_action = call_start;
605 EXPORT_SYMBOL_GPL(rpc_call_start);
608 * rpc_peeraddr - extract remote peer address from clnt's xprt
609 * @clnt: RPC client structure
610 * @buf: target buffer
611 * @bufsize: length of target buffer
613 * Returns the number of bytes that are actually in the stored address.
615 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
617 size_t bytes;
618 struct rpc_xprt *xprt = clnt->cl_xprt;
620 bytes = sizeof(xprt->addr);
621 if (bytes > bufsize)
622 bytes = bufsize;
623 memcpy(buf, &clnt->cl_xprt->addr, bytes);
624 return xprt->addrlen;
626 EXPORT_SYMBOL_GPL(rpc_peeraddr);
629 * rpc_peeraddr2str - return remote peer address in printable format
630 * @clnt: RPC client structure
631 * @format: address format
634 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
635 enum rpc_display_format_t format)
637 struct rpc_xprt *xprt = clnt->cl_xprt;
639 if (xprt->address_strings[format] != NULL)
640 return xprt->address_strings[format];
641 else
642 return "unprintable";
644 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
646 void
647 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
649 struct rpc_xprt *xprt = clnt->cl_xprt;
650 if (xprt->ops->set_buffer_size)
651 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
653 EXPORT_SYMBOL_GPL(rpc_setbufsize);
656 * Return size of largest payload RPC client can support, in bytes
658 * For stream transports, this is one RPC record fragment (see RFC
659 * 1831), as we don't support multi-record requests yet. For datagram
660 * transports, this is the size of an IP packet minus the IP, UDP, and
661 * RPC header sizes.
663 size_t rpc_max_payload(struct rpc_clnt *clnt)
665 return clnt->cl_xprt->max_payload;
667 EXPORT_SYMBOL_GPL(rpc_max_payload);
670 * rpc_force_rebind - force transport to check that remote port is unchanged
671 * @clnt: client to rebind
674 void rpc_force_rebind(struct rpc_clnt *clnt)
676 if (clnt->cl_autobind)
677 xprt_clear_bound(clnt->cl_xprt);
679 EXPORT_SYMBOL_GPL(rpc_force_rebind);
682 * Restart an (async) RPC call. Usually called from within the
683 * exit handler.
685 void
686 rpc_restart_call(struct rpc_task *task)
688 if (RPC_ASSASSINATED(task))
689 return;
691 task->tk_action = call_start;
693 EXPORT_SYMBOL_GPL(rpc_restart_call);
695 #ifdef RPC_DEBUG
696 static const char *rpc_proc_name(const struct rpc_task *task)
698 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
700 if (proc) {
701 if (proc->p_name)
702 return proc->p_name;
703 else
704 return "NULL";
705 } else
706 return "no proc";
708 #endif
711 * 0. Initial state
713 * Other FSM states can be visited zero or more times, but
714 * this state is visited exactly once for each RPC.
716 static void
717 call_start(struct rpc_task *task)
719 struct rpc_clnt *clnt = task->tk_client;
721 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
722 clnt->cl_protname, clnt->cl_vers,
723 rpc_proc_name(task),
724 (RPC_IS_ASYNC(task) ? "async" : "sync"));
726 /* Increment call count */
727 task->tk_msg.rpc_proc->p_count++;
728 clnt->cl_stats->rpccnt++;
729 task->tk_action = call_reserve;
733 * 1. Reserve an RPC call slot
735 static void
736 call_reserve(struct rpc_task *task)
738 dprint_status(task);
740 if (!rpcauth_uptodatecred(task)) {
741 task->tk_action = call_refresh;
742 return;
745 task->tk_status = 0;
746 task->tk_action = call_reserveresult;
747 xprt_reserve(task);
751 * 1b. Grok the result of xprt_reserve()
753 static void
754 call_reserveresult(struct rpc_task *task)
756 int status = task->tk_status;
758 dprint_status(task);
761 * After a call to xprt_reserve(), we must have either
762 * a request slot or else an error status.
764 task->tk_status = 0;
765 if (status >= 0) {
766 if (task->tk_rqstp) {
767 task->tk_action = call_allocate;
768 return;
771 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
772 __func__, status);
773 rpc_exit(task, -EIO);
774 return;
778 * Even though there was an error, we may have acquired
779 * a request slot somehow. Make sure not to leak it.
781 if (task->tk_rqstp) {
782 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
783 __func__, status);
784 xprt_release(task);
787 switch (status) {
788 case -EAGAIN: /* woken up; retry */
789 task->tk_action = call_reserve;
790 return;
791 case -EIO: /* probably a shutdown */
792 break;
793 default:
794 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
795 __func__, status);
796 break;
798 rpc_exit(task, status);
802 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
803 * (Note: buffer memory is freed in xprt_release).
805 static void
806 call_allocate(struct rpc_task *task)
808 unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack;
809 struct rpc_rqst *req = task->tk_rqstp;
810 struct rpc_xprt *xprt = task->tk_xprt;
811 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
813 dprint_status(task);
815 task->tk_status = 0;
816 task->tk_action = call_bind;
818 if (req->rq_buffer)
819 return;
821 if (proc->p_proc != 0) {
822 BUG_ON(proc->p_arglen == 0);
823 if (proc->p_decode != NULL)
824 BUG_ON(proc->p_replen == 0);
828 * Calculate the size (in quads) of the RPC call
829 * and reply headers, and convert both values
830 * to byte sizes.
832 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
833 req->rq_callsize <<= 2;
834 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
835 req->rq_rcvsize <<= 2;
837 req->rq_buffer = xprt->ops->buf_alloc(task,
838 req->rq_callsize + req->rq_rcvsize);
839 if (req->rq_buffer != NULL)
840 return;
842 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
844 if (RPC_IS_ASYNC(task) || !signalled()) {
845 task->tk_action = call_allocate;
846 rpc_delay(task, HZ>>4);
847 return;
850 rpc_exit(task, -ERESTARTSYS);
853 static inline int
854 rpc_task_need_encode(struct rpc_task *task)
856 return task->tk_rqstp->rq_snd_buf.len == 0;
859 static inline void
860 rpc_task_force_reencode(struct rpc_task *task)
862 task->tk_rqstp->rq_snd_buf.len = 0;
865 static inline void
866 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
868 buf->head[0].iov_base = start;
869 buf->head[0].iov_len = len;
870 buf->tail[0].iov_len = 0;
871 buf->page_len = 0;
872 buf->flags = 0;
873 buf->len = 0;
874 buf->buflen = len;
878 * 3. Encode arguments of an RPC call
880 static void
881 rpc_xdr_encode(struct rpc_task *task)
883 struct rpc_rqst *req = task->tk_rqstp;
884 kxdrproc_t encode;
885 __be32 *p;
887 dprint_status(task);
889 rpc_xdr_buf_init(&req->rq_snd_buf,
890 req->rq_buffer,
891 req->rq_callsize);
892 rpc_xdr_buf_init(&req->rq_rcv_buf,
893 (char *)req->rq_buffer + req->rq_callsize,
894 req->rq_rcvsize);
896 p = rpc_encode_header(task);
897 if (p == NULL) {
898 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
899 rpc_exit(task, -EIO);
900 return;
903 encode = task->tk_msg.rpc_proc->p_encode;
904 if (encode == NULL)
905 return;
907 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
908 task->tk_msg.rpc_argp);
912 * 4. Get the server port number if not yet set
914 static void
915 call_bind(struct rpc_task *task)
917 struct rpc_xprt *xprt = task->tk_xprt;
919 dprint_status(task);
921 task->tk_action = call_connect;
922 if (!xprt_bound(xprt)) {
923 task->tk_action = call_bind_status;
924 task->tk_timeout = xprt->bind_timeout;
925 xprt->ops->rpcbind(task);
930 * 4a. Sort out bind result
932 static void
933 call_bind_status(struct rpc_task *task)
935 int status = -EIO;
937 if (task->tk_status >= 0) {
938 dprint_status(task);
939 task->tk_status = 0;
940 task->tk_action = call_connect;
941 return;
944 switch (task->tk_status) {
945 case -ENOMEM:
946 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
947 rpc_delay(task, HZ >> 2);
948 goto retry_timeout;
949 case -EACCES:
950 dprintk("RPC: %5u remote rpcbind: RPC program/version "
951 "unavailable\n", task->tk_pid);
952 /* fail immediately if this is an RPC ping */
953 if (task->tk_msg.rpc_proc->p_proc == 0) {
954 status = -EOPNOTSUPP;
955 break;
957 rpc_delay(task, 3*HZ);
958 goto retry_timeout;
959 case -ETIMEDOUT:
960 dprintk("RPC: %5u rpcbind request timed out\n",
961 task->tk_pid);
962 goto retry_timeout;
963 case -EPFNOSUPPORT:
964 /* server doesn't support any rpcbind version we know of */
965 dprintk("RPC: %5u remote rpcbind service unavailable\n",
966 task->tk_pid);
967 break;
968 case -EPROTONOSUPPORT:
969 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
970 task->tk_pid);
971 task->tk_status = 0;
972 task->tk_action = call_bind;
973 return;
974 default:
975 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
976 task->tk_pid, -task->tk_status);
979 rpc_exit(task, status);
980 return;
982 retry_timeout:
983 task->tk_action = call_timeout;
987 * 4b. Connect to the RPC server
989 static void
990 call_connect(struct rpc_task *task)
992 struct rpc_xprt *xprt = task->tk_xprt;
994 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
995 task->tk_pid, xprt,
996 (xprt_connected(xprt) ? "is" : "is not"));
998 task->tk_action = call_transmit;
999 if (!xprt_connected(xprt)) {
1000 task->tk_action = call_connect_status;
1001 if (task->tk_status < 0)
1002 return;
1003 xprt_connect(task);
1008 * 4c. Sort out connect result
1010 static void
1011 call_connect_status(struct rpc_task *task)
1013 struct rpc_clnt *clnt = task->tk_client;
1014 int status = task->tk_status;
1016 dprint_status(task);
1018 task->tk_status = 0;
1019 if (status >= 0) {
1020 clnt->cl_stats->netreconn++;
1021 task->tk_action = call_transmit;
1022 return;
1025 /* Something failed: remote service port may have changed */
1026 rpc_force_rebind(clnt);
1028 switch (status) {
1029 case -ENOTCONN:
1030 case -EAGAIN:
1031 task->tk_action = call_bind;
1032 if (!RPC_IS_SOFT(task))
1033 return;
1034 /* if soft mounted, test if we've timed out */
1035 case -ETIMEDOUT:
1036 task->tk_action = call_timeout;
1037 return;
1039 rpc_exit(task, -EIO);
1043 * 5. Transmit the RPC request, and wait for reply
1045 static void
1046 call_transmit(struct rpc_task *task)
1048 dprint_status(task);
1050 task->tk_action = call_status;
1051 if (task->tk_status < 0)
1052 return;
1053 task->tk_status = xprt_prepare_transmit(task);
1054 if (task->tk_status != 0)
1055 return;
1056 task->tk_action = call_transmit_status;
1057 /* Encode here so that rpcsec_gss can use correct sequence number. */
1058 if (rpc_task_need_encode(task)) {
1059 BUG_ON(task->tk_rqstp->rq_bytes_sent != 0);
1060 rpc_xdr_encode(task);
1061 /* Did the encode result in an error condition? */
1062 if (task->tk_status != 0) {
1063 /* Was the error nonfatal? */
1064 if (task->tk_status == -EAGAIN)
1065 rpc_delay(task, HZ >> 4);
1066 else
1067 rpc_exit(task, task->tk_status);
1068 return;
1071 xprt_transmit(task);
1072 if (task->tk_status < 0)
1073 return;
1075 * On success, ensure that we call xprt_end_transmit() before sleeping
1076 * in order to allow access to the socket to other RPC requests.
1078 call_transmit_status(task);
1079 if (task->tk_msg.rpc_proc->p_decode != NULL)
1080 return;
1081 task->tk_action = rpc_exit_task;
1082 rpc_wake_up_queued_task(&task->tk_xprt->pending, task);
1086 * 5a. Handle cleanup after a transmission
1088 static void
1089 call_transmit_status(struct rpc_task *task)
1091 task->tk_action = call_status;
1093 * Special case: if we've been waiting on the socket's write_space()
1094 * callback, then don't call xprt_end_transmit().
1096 if (task->tk_status == -EAGAIN)
1097 return;
1098 xprt_end_transmit(task);
1099 rpc_task_force_reencode(task);
1103 * 6. Sort out the RPC call status
1105 static void
1106 call_status(struct rpc_task *task)
1108 struct rpc_clnt *clnt = task->tk_client;
1109 struct rpc_rqst *req = task->tk_rqstp;
1110 int status;
1112 if (req->rq_received > 0 && !req->rq_bytes_sent)
1113 task->tk_status = req->rq_received;
1115 dprint_status(task);
1117 status = task->tk_status;
1118 if (status >= 0) {
1119 task->tk_action = call_decode;
1120 return;
1123 task->tk_status = 0;
1124 switch(status) {
1125 case -EHOSTDOWN:
1126 case -EHOSTUNREACH:
1127 case -ENETUNREACH:
1129 * Delay any retries for 3 seconds, then handle as if it
1130 * were a timeout.
1132 rpc_delay(task, 3*HZ);
1133 case -ETIMEDOUT:
1134 task->tk_action = call_timeout;
1135 if (task->tk_client->cl_discrtry)
1136 xprt_conditional_disconnect(task->tk_xprt,
1137 req->rq_connect_cookie);
1138 break;
1139 case -ECONNREFUSED:
1140 case -ENOTCONN:
1141 rpc_force_rebind(clnt);
1142 task->tk_action = call_bind;
1143 break;
1144 case -EAGAIN:
1145 task->tk_action = call_transmit;
1146 break;
1147 case -EIO:
1148 /* shutdown or soft timeout */
1149 rpc_exit(task, status);
1150 break;
1151 default:
1152 if (clnt->cl_chatty)
1153 printk("%s: RPC call returned error %d\n",
1154 clnt->cl_protname, -status);
1155 rpc_exit(task, status);
1160 * 6a. Handle RPC timeout
1161 * We do not release the request slot, so we keep using the
1162 * same XID for all retransmits.
1164 static void
1165 call_timeout(struct rpc_task *task)
1167 struct rpc_clnt *clnt = task->tk_client;
1169 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1170 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1171 goto retry;
1174 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1175 task->tk_timeouts++;
1177 if (RPC_IS_SOFT(task)) {
1178 if (clnt->cl_chatty)
1179 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1180 clnt->cl_protname, clnt->cl_server);
1181 rpc_exit(task, -EIO);
1182 return;
1185 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1186 task->tk_flags |= RPC_CALL_MAJORSEEN;
1187 if (clnt->cl_chatty)
1188 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1189 clnt->cl_protname, clnt->cl_server);
1191 rpc_force_rebind(clnt);
1193 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1194 * event? RFC2203 requires the server to drop all such requests.
1196 rpcauth_invalcred(task);
1198 retry:
1199 clnt->cl_stats->rpcretrans++;
1200 task->tk_action = call_bind;
1201 task->tk_status = 0;
1205 * 7. Decode the RPC reply
1207 static void
1208 call_decode(struct rpc_task *task)
1210 struct rpc_clnt *clnt = task->tk_client;
1211 struct rpc_rqst *req = task->tk_rqstp;
1212 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
1213 __be32 *p;
1215 dprintk("RPC: %5u call_decode (status %d)\n",
1216 task->tk_pid, task->tk_status);
1218 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1219 if (clnt->cl_chatty)
1220 printk(KERN_NOTICE "%s: server %s OK\n",
1221 clnt->cl_protname, clnt->cl_server);
1222 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1226 * Ensure that we see all writes made by xprt_complete_rqst()
1227 * before it changed req->rq_received.
1229 smp_rmb();
1230 req->rq_rcv_buf.len = req->rq_private_buf.len;
1232 /* Check that the softirq receive buffer is valid */
1233 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1234 sizeof(req->rq_rcv_buf)) != 0);
1236 if (req->rq_rcv_buf.len < 12) {
1237 if (!RPC_IS_SOFT(task)) {
1238 task->tk_action = call_bind;
1239 clnt->cl_stats->rpcretrans++;
1240 goto out_retry;
1242 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1243 clnt->cl_protname, task->tk_status);
1244 task->tk_action = call_timeout;
1245 goto out_retry;
1248 p = rpc_verify_header(task);
1249 if (IS_ERR(p)) {
1250 if (p == ERR_PTR(-EAGAIN))
1251 goto out_retry;
1252 return;
1255 task->tk_action = rpc_exit_task;
1257 if (decode) {
1258 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1259 task->tk_msg.rpc_resp);
1261 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
1262 task->tk_status);
1263 return;
1264 out_retry:
1265 task->tk_status = 0;
1266 /* Note: rpc_verify_header() may have freed the RPC slot */
1267 if (task->tk_rqstp == req) {
1268 req->rq_received = req->rq_rcv_buf.len = 0;
1269 if (task->tk_client->cl_discrtry)
1270 xprt_conditional_disconnect(task->tk_xprt,
1271 req->rq_connect_cookie);
1276 * 8. Refresh the credentials if rejected by the server
1278 static void
1279 call_refresh(struct rpc_task *task)
1281 dprint_status(task);
1283 task->tk_action = call_refreshresult;
1284 task->tk_status = 0;
1285 task->tk_client->cl_stats->rpcauthrefresh++;
1286 rpcauth_refreshcred(task);
1290 * 8a. Process the results of a credential refresh
1292 static void
1293 call_refreshresult(struct rpc_task *task)
1295 int status = task->tk_status;
1297 dprint_status(task);
1299 task->tk_status = 0;
1300 task->tk_action = call_reserve;
1301 if (status >= 0 && rpcauth_uptodatecred(task))
1302 return;
1303 if (status == -EACCES) {
1304 rpc_exit(task, -EACCES);
1305 return;
1307 task->tk_action = call_refresh;
1308 if (status != -ETIMEDOUT)
1309 rpc_delay(task, 3*HZ);
1310 return;
1313 static __be32 *
1314 rpc_encode_header(struct rpc_task *task)
1316 struct rpc_clnt *clnt = task->tk_client;
1317 struct rpc_rqst *req = task->tk_rqstp;
1318 __be32 *p = req->rq_svec[0].iov_base;
1320 /* FIXME: check buffer size? */
1322 p = xprt_skip_transport_header(task->tk_xprt, p);
1323 *p++ = req->rq_xid; /* XID */
1324 *p++ = htonl(RPC_CALL); /* CALL */
1325 *p++ = htonl(RPC_VERSION); /* RPC version */
1326 *p++ = htonl(clnt->cl_prog); /* program number */
1327 *p++ = htonl(clnt->cl_vers); /* program version */
1328 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
1329 p = rpcauth_marshcred(task, p);
1330 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
1331 return p;
1334 static __be32 *
1335 rpc_verify_header(struct rpc_task *task)
1337 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
1338 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
1339 __be32 *p = iov->iov_base;
1340 u32 n;
1341 int error = -EACCES;
1343 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
1344 /* RFC-1014 says that the representation of XDR data must be a
1345 * multiple of four bytes
1346 * - if it isn't pointer subtraction in the NFS client may give
1347 * undefined results
1349 dprintk("RPC: %5u %s: XDR representation not a multiple of"
1350 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
1351 task->tk_rqstp->rq_rcv_buf.len);
1352 goto out_eio;
1354 if ((len -= 3) < 0)
1355 goto out_overflow;
1356 p += 1; /* skip XID */
1358 if ((n = ntohl(*p++)) != RPC_REPLY) {
1359 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
1360 task->tk_pid, __func__, n);
1361 goto out_garbage;
1363 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
1364 if (--len < 0)
1365 goto out_overflow;
1366 switch ((n = ntohl(*p++))) {
1367 case RPC_AUTH_ERROR:
1368 break;
1369 case RPC_MISMATCH:
1370 dprintk("RPC: %5u %s: RPC call version "
1371 "mismatch!\n",
1372 task->tk_pid, __func__);
1373 error = -EPROTONOSUPPORT;
1374 goto out_err;
1375 default:
1376 dprintk("RPC: %5u %s: RPC call rejected, "
1377 "unknown error: %x\n",
1378 task->tk_pid, __func__, n);
1379 goto out_eio;
1381 if (--len < 0)
1382 goto out_overflow;
1383 switch ((n = ntohl(*p++))) {
1384 case RPC_AUTH_REJECTEDCRED:
1385 case RPC_AUTH_REJECTEDVERF:
1386 case RPCSEC_GSS_CREDPROBLEM:
1387 case RPCSEC_GSS_CTXPROBLEM:
1388 if (!task->tk_cred_retry)
1389 break;
1390 task->tk_cred_retry--;
1391 dprintk("RPC: %5u %s: retry stale creds\n",
1392 task->tk_pid, __func__);
1393 rpcauth_invalcred(task);
1394 /* Ensure we obtain a new XID! */
1395 xprt_release(task);
1396 task->tk_action = call_refresh;
1397 goto out_retry;
1398 case RPC_AUTH_BADCRED:
1399 case RPC_AUTH_BADVERF:
1400 /* possibly garbled cred/verf? */
1401 if (!task->tk_garb_retry)
1402 break;
1403 task->tk_garb_retry--;
1404 dprintk("RPC: %5u %s: retry garbled creds\n",
1405 task->tk_pid, __func__);
1406 task->tk_action = call_bind;
1407 goto out_retry;
1408 case RPC_AUTH_TOOWEAK:
1409 printk(KERN_NOTICE "RPC: server %s requires stronger "
1410 "authentication.\n", task->tk_client->cl_server);
1411 break;
1412 default:
1413 dprintk("RPC: %5u %s: unknown auth error: %x\n",
1414 task->tk_pid, __func__, n);
1415 error = -EIO;
1417 dprintk("RPC: %5u %s: call rejected %d\n",
1418 task->tk_pid, __func__, n);
1419 goto out_err;
1421 if (!(p = rpcauth_checkverf(task, p))) {
1422 dprintk("RPC: %5u %s: auth check failed\n",
1423 task->tk_pid, __func__);
1424 goto out_garbage; /* bad verifier, retry */
1426 len = p - (__be32 *)iov->iov_base - 1;
1427 if (len < 0)
1428 goto out_overflow;
1429 switch ((n = ntohl(*p++))) {
1430 case RPC_SUCCESS:
1431 return p;
1432 case RPC_PROG_UNAVAIL:
1433 dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
1434 task->tk_pid, __func__,
1435 (unsigned int)task->tk_client->cl_prog,
1436 task->tk_client->cl_server);
1437 error = -EPFNOSUPPORT;
1438 goto out_err;
1439 case RPC_PROG_MISMATCH:
1440 dprintk("RPC: %5u %s: program %u, version %u unsupported by "
1441 "server %s\n", task->tk_pid, __func__,
1442 (unsigned int)task->tk_client->cl_prog,
1443 (unsigned int)task->tk_client->cl_vers,
1444 task->tk_client->cl_server);
1445 error = -EPROTONOSUPPORT;
1446 goto out_err;
1447 case RPC_PROC_UNAVAIL:
1448 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
1449 "version %u on server %s\n",
1450 task->tk_pid, __func__,
1451 rpc_proc_name(task),
1452 task->tk_client->cl_prog,
1453 task->tk_client->cl_vers,
1454 task->tk_client->cl_server);
1455 error = -EOPNOTSUPP;
1456 goto out_err;
1457 case RPC_GARBAGE_ARGS:
1458 dprintk("RPC: %5u %s: server saw garbage\n",
1459 task->tk_pid, __func__);
1460 break; /* retry */
1461 default:
1462 dprintk("RPC: %5u %s: server accept status: %x\n",
1463 task->tk_pid, __func__, n);
1464 /* Also retry */
1467 out_garbage:
1468 task->tk_client->cl_stats->rpcgarbage++;
1469 if (task->tk_garb_retry) {
1470 task->tk_garb_retry--;
1471 dprintk("RPC: %5u %s: retrying\n",
1472 task->tk_pid, __func__);
1473 task->tk_action = call_bind;
1474 out_retry:
1475 return ERR_PTR(-EAGAIN);
1477 out_eio:
1478 error = -EIO;
1479 out_err:
1480 rpc_exit(task, error);
1481 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
1482 __func__, error);
1483 return ERR_PTR(error);
1484 out_overflow:
1485 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
1486 __func__);
1487 goto out_garbage;
1490 static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj)
1492 return 0;
1495 static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj)
1497 return 0;
1500 static struct rpc_procinfo rpcproc_null = {
1501 .p_encode = rpcproc_encode_null,
1502 .p_decode = rpcproc_decode_null,
1505 static int rpc_ping(struct rpc_clnt *clnt, int flags)
1507 struct rpc_message msg = {
1508 .rpc_proc = &rpcproc_null,
1510 int err;
1511 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
1512 err = rpc_call_sync(clnt, &msg, flags);
1513 put_rpccred(msg.rpc_cred);
1514 return err;
1517 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
1519 struct rpc_message msg = {
1520 .rpc_proc = &rpcproc_null,
1521 .rpc_cred = cred,
1523 struct rpc_task_setup task_setup_data = {
1524 .rpc_client = clnt,
1525 .rpc_message = &msg,
1526 .callback_ops = &rpc_default_ops,
1527 .flags = flags,
1529 return rpc_run_task(&task_setup_data);
1531 EXPORT_SYMBOL_GPL(rpc_call_null);
1533 #ifdef RPC_DEBUG
1534 static void rpc_show_header(void)
1536 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
1537 "-timeout ---ops--\n");
1540 static void rpc_show_task(const struct rpc_clnt *clnt,
1541 const struct rpc_task *task)
1543 const char *rpc_waitq = "none";
1544 char *p, action[KSYM_SYMBOL_LEN];
1546 if (RPC_IS_QUEUED(task))
1547 rpc_waitq = rpc_qname(task->tk_waitqueue);
1549 /* map tk_action pointer to a function name; then trim off
1550 * the "+0x0 [sunrpc]" */
1551 sprint_symbol(action, (unsigned long)task->tk_action);
1552 p = strchr(action, '+');
1553 if (p)
1554 *p = '\0';
1556 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n",
1557 task->tk_pid, task->tk_flags, task->tk_status,
1558 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
1559 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
1560 action, rpc_waitq);
1563 void rpc_show_tasks(void)
1565 struct rpc_clnt *clnt;
1566 struct rpc_task *task;
1567 int header = 0;
1569 spin_lock(&rpc_client_lock);
1570 list_for_each_entry(clnt, &all_clients, cl_clients) {
1571 spin_lock(&clnt->cl_lock);
1572 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
1573 if (!header) {
1574 rpc_show_header();
1575 header++;
1577 rpc_show_task(clnt, task);
1579 spin_unlock(&clnt->cl_lock);
1581 spin_unlock(&rpc_client_lock);
1583 #endif