blob: 702ede309b067260130321a32f8e8c1779b529bf [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Chuck Lever55aa4f52005-08-11 16:25:47 -04002 * linux/net/sunrpc/clnt.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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.
7 *
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.
15 *
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.
19 *
20 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
21 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
22 */
23
24#include <asm/system.h>
25
26#include <linux/module.h>
27#include <linux/types.h>
28#include <linux/mm.h>
29#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/utsname.h>
31
32#include <linux/sunrpc/clnt.h>
33#include <linux/workqueue.h>
34#include <linux/sunrpc/rpc_pipe_fs.h>
35
36#include <linux/nfs.h>
37
38
39#define RPC_SLACK_SPACE (1024) /* total overkill */
40
41#ifdef RPC_DEBUG
42# define RPCDBG_FACILITY RPCDBG_CALL
43#endif
44
45static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
46
47
48static void call_start(struct rpc_task *task);
49static void call_reserve(struct rpc_task *task);
50static void call_reserveresult(struct rpc_task *task);
51static void call_allocate(struct rpc_task *task);
52static void call_encode(struct rpc_task *task);
53static void call_decode(struct rpc_task *task);
54static void call_bind(struct rpc_task *task);
Chuck Leverda351872005-08-11 16:25:11 -040055static void call_bind_status(struct rpc_task *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056static void call_transmit(struct rpc_task *task);
57static void call_status(struct rpc_task *task);
58static void call_refresh(struct rpc_task *task);
59static void call_refreshresult(struct rpc_task *task);
60static void call_timeout(struct rpc_task *task);
61static void call_connect(struct rpc_task *task);
62static void call_connect_status(struct rpc_task *task);
63static u32 * call_header(struct rpc_task *task);
64static u32 * call_verify(struct rpc_task *task);
65
66
67static int
68rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
69{
Trond Myklebustf1345852005-09-23 11:08:25 -040070 static uint32_t clntid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 int error;
72
73 if (dir_name == NULL)
74 return 0;
Trond Myklebustf1345852005-09-23 11:08:25 -040075 for (;;) {
76 snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
77 "%s/clnt%x", dir_name,
78 (unsigned int)clntid++);
79 clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
80 clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
81 if (!IS_ERR(clnt->cl_dentry))
82 return 0;
Christoph Hellwig278c9952005-07-24 23:53:01 +010083 error = PTR_ERR(clnt->cl_dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -040084 if (error != -EEXIST) {
85 printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
86 clnt->cl_pathname, error);
87 return error;
88 }
Christoph Hellwig278c9952005-07-24 23:53:01 +010089 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070090}
91
92/*
93 * Create an RPC client
94 * FIXME: This should also take a flags argument (as in task->tk_flags).
95 * It's called (among others) from pmap_create_client, which may in
96 * turn be called by an async task. In this case, rpciod should not be
97 * made to sleep too long.
98 */
99struct rpc_clnt *
Trond Myklebust5ee0ed72005-06-22 17:16:20 +0000100rpc_new_client(struct rpc_xprt *xprt, char *servname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 struct rpc_program *program, u32 vers,
102 rpc_authflavor_t flavor)
103{
104 struct rpc_version *version;
105 struct rpc_clnt *clnt = NULL;
J. Bruce Fields6a192752005-06-22 17:16:23 +0000106 struct rpc_auth *auth;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 int err;
108 int len;
109
110 dprintk("RPC: creating %s client for %s (xprt %p)\n",
111 program->name, servname, xprt);
112
113 err = -EINVAL;
114 if (!xprt)
115 goto out_err;
116 if (vers >= program->nrvers || !(version = program->version[vers]))
117 goto out_err;
118
119 err = -ENOMEM;
120 clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL);
121 if (!clnt)
122 goto out_err;
123 memset(clnt, 0, sizeof(*clnt));
124 atomic_set(&clnt->cl_users, 0);
125 atomic_set(&clnt->cl_count, 1);
126 clnt->cl_parent = clnt;
127
128 clnt->cl_server = clnt->cl_inline_name;
129 len = strlen(servname) + 1;
130 if (len > sizeof(clnt->cl_inline_name)) {
131 char *buf = kmalloc(len, GFP_KERNEL);
132 if (buf != 0)
133 clnt->cl_server = buf;
134 else
135 len = sizeof(clnt->cl_inline_name);
136 }
137 strlcpy(clnt->cl_server, servname, len);
138
139 clnt->cl_xprt = xprt;
140 clnt->cl_procinfo = version->procs;
141 clnt->cl_maxproc = version->nrprocs;
142 clnt->cl_protname = program->name;
143 clnt->cl_pmap = &clnt->cl_pmap_default;
144 clnt->cl_port = xprt->addr.sin_port;
145 clnt->cl_prog = program->number;
146 clnt->cl_vers = version->number;
147 clnt->cl_prot = xprt->prot;
148 clnt->cl_stats = program->stats;
149 rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
150
151 if (!clnt->cl_port)
152 clnt->cl_autobind = 1;
153
154 clnt->cl_rtt = &clnt->cl_rtt_default;
155 rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
156
157 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
158 if (err < 0)
159 goto out_no_path;
160
J. Bruce Fields6a192752005-06-22 17:16:23 +0000161 auth = rpcauth_create(flavor, clnt);
162 if (IS_ERR(auth)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
164 flavor);
J. Bruce Fields6a192752005-06-22 17:16:23 +0000165 err = PTR_ERR(auth);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 goto out_no_auth;
167 }
168
169 /* save the nodename */
170 clnt->cl_nodelen = strlen(system_utsname.nodename);
171 if (clnt->cl_nodelen > UNX_MAXNODENAME)
172 clnt->cl_nodelen = UNX_MAXNODENAME;
173 memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
174 return clnt;
175
176out_no_auth:
Trond Myklebustf1345852005-09-23 11:08:25 -0400177 rpc_rmdir(clnt->cl_pathname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178out_no_path:
179 if (clnt->cl_server != clnt->cl_inline_name)
180 kfree(clnt->cl_server);
181 kfree(clnt);
182out_err:
Trond Myklebust5b616f52005-06-22 17:16:20 +0000183 xprt_destroy(xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return ERR_PTR(err);
185}
186
Trond Myklebust5ee0ed72005-06-22 17:16:20 +0000187/**
188 * Create an RPC client
189 * @xprt - pointer to xprt struct
190 * @servname - name of server
191 * @info - rpc_program
192 * @version - rpc_program version
193 * @authflavor - rpc_auth flavour to use
194 *
195 * Creates an RPC client structure, then pings the server in order to
196 * determine if it is up, and if it supports this program and version.
197 *
198 * This function should never be called by asynchronous tasks such as
199 * the portmapper.
200 */
201struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname,
202 struct rpc_program *info, u32 version, rpc_authflavor_t authflavor)
203{
204 struct rpc_clnt *clnt;
205 int err;
206
207 clnt = rpc_new_client(xprt, servname, info, version, authflavor);
208 if (IS_ERR(clnt))
209 return clnt;
210 err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR);
211 if (err == 0)
212 return clnt;
213 rpc_shutdown_client(clnt);
214 return ERR_PTR(err);
215}
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217/*
218 * This function clones the RPC client structure. It allows us to share the
219 * same transport while varying parameters such as the authentication
220 * flavour.
221 */
222struct rpc_clnt *
223rpc_clone_client(struct rpc_clnt *clnt)
224{
225 struct rpc_clnt *new;
226
227 new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
228 if (!new)
229 goto out_no_clnt;
230 memcpy(new, clnt, sizeof(*new));
231 atomic_set(&new->cl_count, 1);
232 atomic_set(&new->cl_users, 0);
233 new->cl_parent = clnt;
234 atomic_inc(&clnt->cl_count);
235 /* Duplicate portmapper */
236 rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
237 /* Turn off autobind on clones */
238 new->cl_autobind = 0;
239 new->cl_oneshot = 0;
240 new->cl_dead = 0;
241 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
242 if (new->cl_auth)
243 atomic_inc(&new->cl_auth->au_count);
Andreas Gruenbacher007e2512005-06-22 17:16:23 +0000244 new->cl_pmap = &new->cl_pmap_default;
245 rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 return new;
247out_no_clnt:
248 printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
249 return ERR_PTR(-ENOMEM);
250}
251
252/*
253 * Properly shut down an RPC client, terminating all outstanding
254 * requests. Note that we must be certain that cl_oneshot and
255 * cl_dead are cleared, or else the client would be destroyed
256 * when the last task releases it.
257 */
258int
259rpc_shutdown_client(struct rpc_clnt *clnt)
260{
261 dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
262 clnt->cl_protname, clnt->cl_server,
263 atomic_read(&clnt->cl_users));
264
265 while (atomic_read(&clnt->cl_users) > 0) {
266 /* Don't let rpc_release_client destroy us */
267 clnt->cl_oneshot = 0;
268 clnt->cl_dead = 0;
269 rpc_killall_tasks(clnt);
270 sleep_on_timeout(&destroy_wait, 1*HZ);
271 }
272
273 if (atomic_read(&clnt->cl_users) < 0) {
274 printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
275 clnt, atomic_read(&clnt->cl_users));
276#ifdef RPC_DEBUG
277 rpc_show_tasks();
278#endif
279 BUG();
280 }
281
282 return rpc_destroy_client(clnt);
283}
284
285/*
286 * Delete an RPC client
287 */
288int
289rpc_destroy_client(struct rpc_clnt *clnt)
290{
291 if (!atomic_dec_and_test(&clnt->cl_count))
292 return 1;
293 BUG_ON(atomic_read(&clnt->cl_users) != 0);
294
295 dprintk("RPC: destroying %s client for %s\n",
296 clnt->cl_protname, clnt->cl_server);
297 if (clnt->cl_auth) {
298 rpcauth_destroy(clnt->cl_auth);
299 clnt->cl_auth = NULL;
300 }
301 if (clnt->cl_parent != clnt) {
302 rpc_destroy_client(clnt->cl_parent);
303 goto out_free;
304 }
Trond Myklebustf1345852005-09-23 11:08:25 -0400305 if (clnt->cl_pathname[0])
306 rpc_rmdir(clnt->cl_pathname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 if (clnt->cl_xprt) {
308 xprt_destroy(clnt->cl_xprt);
309 clnt->cl_xprt = NULL;
310 }
311 if (clnt->cl_server != clnt->cl_inline_name)
312 kfree(clnt->cl_server);
313out_free:
314 kfree(clnt);
315 return 0;
316}
317
318/*
319 * Release an RPC client
320 */
321void
322rpc_release_client(struct rpc_clnt *clnt)
323{
324 dprintk("RPC: rpc_release_client(%p, %d)\n",
325 clnt, atomic_read(&clnt->cl_users));
326
327 if (!atomic_dec_and_test(&clnt->cl_users))
328 return;
329 wake_up(&destroy_wait);
330 if (clnt->cl_oneshot || clnt->cl_dead)
331 rpc_destroy_client(clnt);
332}
333
Andreas Gruenbacher007e2512005-06-22 17:16:23 +0000334/**
335 * rpc_bind_new_program - bind a new RPC program to an existing client
336 * @old - old rpc_client
337 * @program - rpc program to set
338 * @vers - rpc program version
339 *
340 * Clones the rpc client and sets up a new RPC program. This is mainly
341 * of use for enabling different RPC programs to share the same transport.
342 * The Sun NFSv2/v3 ACL protocol can do this.
343 */
344struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
345 struct rpc_program *program,
346 int vers)
347{
348 struct rpc_clnt *clnt;
349 struct rpc_version *version;
350 int err;
351
352 BUG_ON(vers >= program->nrvers || !program->version[vers]);
353 version = program->version[vers];
354 clnt = rpc_clone_client(old);
355 if (IS_ERR(clnt))
356 goto out;
357 clnt->cl_procinfo = version->procs;
358 clnt->cl_maxproc = version->nrprocs;
359 clnt->cl_protname = program->name;
360 clnt->cl_prog = program->number;
361 clnt->cl_vers = version->number;
362 clnt->cl_stats = program->stats;
363 err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR);
364 if (err != 0) {
365 rpc_shutdown_client(clnt);
366 clnt = ERR_PTR(err);
367 }
368out:
369 return clnt;
370}
371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372/*
373 * Default callback for async RPC calls
374 */
375static void
376rpc_default_callback(struct rpc_task *task)
377{
378}
379
380/*
Trond Myklebust14b218a2005-06-22 17:16:28 +0000381 * Export the signal mask handling for synchronous code that
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 * sleeps on RPC calls
383 */
Trond Myklebust14b218a2005-06-22 17:16:28 +0000384#define RPC_INTR_SIGNALS (sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGKILL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Trond Myklebust14b218a2005-06-22 17:16:28 +0000386static void rpc_save_sigmask(sigset_t *oldset, int intr)
387{
388 unsigned long sigallow = 0;
389 sigset_t sigmask;
390
391 /* Block all signals except those listed in sigallow */
392 if (intr)
393 sigallow |= RPC_INTR_SIGNALS;
394 siginitsetinv(&sigmask, sigallow);
395 sigprocmask(SIG_BLOCK, &sigmask, oldset);
396}
397
398static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset)
399{
400 rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task));
401}
402
403static inline void rpc_restore_sigmask(sigset_t *oldset)
404{
405 sigprocmask(SIG_SETMASK, oldset, NULL);
406}
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
409{
Trond Myklebust14b218a2005-06-22 17:16:28 +0000410 rpc_save_sigmask(oldset, clnt->cl_intr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411}
412
413void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
414{
Trond Myklebust14b218a2005-06-22 17:16:28 +0000415 rpc_restore_sigmask(oldset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416}
417
418/*
419 * New rpc_call implementation
420 */
421int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
422{
423 struct rpc_task *task;
424 sigset_t oldset;
425 int status;
426
427 /* If this client is slain all further I/O fails */
428 if (clnt->cl_dead)
429 return -EIO;
430
431 BUG_ON(flags & RPC_TASK_ASYNC);
432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 status = -ENOMEM;
434 task = rpc_new_task(clnt, NULL, flags);
435 if (task == NULL)
436 goto out;
437
Trond Myklebust14b218a2005-06-22 17:16:28 +0000438 /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */
439 rpc_task_sigmask(task, &oldset);
440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 rpc_call_setup(task, msg, 0);
442
443 /* Set up the call info struct and execute the task */
Trond Myklebust14b218a2005-06-22 17:16:28 +0000444 if (task->tk_status == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 status = rpc_execute(task);
Trond Myklebust14b218a2005-06-22 17:16:28 +0000446 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 status = task->tk_status;
448 rpc_release_task(task);
449 }
450
Trond Myklebust14b218a2005-06-22 17:16:28 +0000451 rpc_restore_sigmask(&oldset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return status;
454}
455
456/*
457 * New rpc_call implementation
458 */
459int
460rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
461 rpc_action callback, void *data)
462{
463 struct rpc_task *task;
464 sigset_t oldset;
465 int status;
466
467 /* If this client is slain all further I/O fails */
468 if (clnt->cl_dead)
469 return -EIO;
470
471 flags |= RPC_TASK_ASYNC;
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 /* Create/initialize a new RPC task */
474 if (!callback)
475 callback = rpc_default_callback;
476 status = -ENOMEM;
477 if (!(task = rpc_new_task(clnt, callback, flags)))
478 goto out;
479 task->tk_calldata = data;
480
Trond Myklebust14b218a2005-06-22 17:16:28 +0000481 /* Mask signals on GSS_AUTH upcalls */
482 rpc_task_sigmask(task, &oldset);
483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 rpc_call_setup(task, msg, 0);
485
486 /* Set up the call info struct and execute the task */
487 status = task->tk_status;
488 if (status == 0)
489 rpc_execute(task);
490 else
491 rpc_release_task(task);
492
Trond Myklebust14b218a2005-06-22 17:16:28 +0000493 rpc_restore_sigmask(&oldset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 return status;
496}
497
498
499void
500rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
501{
502 task->tk_msg = *msg;
503 task->tk_flags |= flags;
504 /* Bind the user cred */
505 if (task->tk_msg.rpc_cred != NULL)
506 rpcauth_holdcred(task);
507 else
508 rpcauth_bindcred(task);
509
510 if (task->tk_status == 0)
511 task->tk_action = call_start;
512 else
513 task->tk_action = NULL;
514}
515
516void
517rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
518{
519 struct rpc_xprt *xprt = clnt->cl_xprt;
Chuck Lever470056c2005-08-25 16:25:56 -0700520 if (xprt->ops->set_buffer_size)
521 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522}
523
524/*
525 * Return size of largest payload RPC client can support, in bytes
526 *
527 * For stream transports, this is one RPC record fragment (see RFC
528 * 1831), as we don't support multi-record requests yet. For datagram
529 * transports, this is the size of an IP packet minus the IP, UDP, and
530 * RPC header sizes.
531 */
532size_t rpc_max_payload(struct rpc_clnt *clnt)
533{
534 return clnt->cl_xprt->max_payload;
535}
536EXPORT_SYMBOL(rpc_max_payload);
537
538/*
539 * Restart an (async) RPC call. Usually called from within the
540 * exit handler.
541 */
542void
543rpc_restart_call(struct rpc_task *task)
544{
545 if (RPC_ASSASSINATED(task))
546 return;
547
548 task->tk_action = call_start;
549}
550
551/*
552 * 0. Initial state
553 *
554 * Other FSM states can be visited zero or more times, but
555 * this state is visited exactly once for each RPC.
556 */
557static void
558call_start(struct rpc_task *task)
559{
560 struct rpc_clnt *clnt = task->tk_client;
561
562 dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
563 clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
564 (RPC_IS_ASYNC(task) ? "async" : "sync"));
565
566 /* Increment call count */
567 task->tk_msg.rpc_proc->p_count++;
568 clnt->cl_stats->rpccnt++;
569 task->tk_action = call_reserve;
570}
571
572/*
573 * 1. Reserve an RPC call slot
574 */
575static void
576call_reserve(struct rpc_task *task)
577{
578 dprintk("RPC: %4d call_reserve\n", task->tk_pid);
579
580 if (!rpcauth_uptodatecred(task)) {
581 task->tk_action = call_refresh;
582 return;
583 }
584
585 task->tk_status = 0;
586 task->tk_action = call_reserveresult;
587 xprt_reserve(task);
588}
589
590/*
591 * 1b. Grok the result of xprt_reserve()
592 */
593static void
594call_reserveresult(struct rpc_task *task)
595{
596 int status = task->tk_status;
597
598 dprintk("RPC: %4d call_reserveresult (status %d)\n",
599 task->tk_pid, task->tk_status);
600
601 /*
602 * After a call to xprt_reserve(), we must have either
603 * a request slot or else an error status.
604 */
605 task->tk_status = 0;
606 if (status >= 0) {
607 if (task->tk_rqstp) {
608 task->tk_action = call_allocate;
609 return;
610 }
611
612 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
613 __FUNCTION__, status);
614 rpc_exit(task, -EIO);
615 return;
616 }
617
618 /*
619 * Even though there was an error, we may have acquired
620 * a request slot somehow. Make sure not to leak it.
621 */
622 if (task->tk_rqstp) {
623 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
624 __FUNCTION__, status);
625 xprt_release(task);
626 }
627
628 switch (status) {
629 case -EAGAIN: /* woken up; retry */
630 task->tk_action = call_reserve;
631 return;
632 case -EIO: /* probably a shutdown */
633 break;
634 default:
635 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
636 __FUNCTION__, status);
637 break;
638 }
639 rpc_exit(task, status);
640}
641
642/*
643 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
644 * (Note: buffer memory is freed in rpc_task_release).
645 */
646static void
647call_allocate(struct rpc_task *task)
648{
649 unsigned int bufsiz;
650
651 dprintk("RPC: %4d call_allocate (status %d)\n",
652 task->tk_pid, task->tk_status);
653 task->tk_action = call_bind;
654 if (task->tk_buffer)
655 return;
656
657 /* FIXME: compute buffer requirements more exactly using
658 * auth->au_wslack */
659 bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
660
661 if (rpc_malloc(task, bufsiz << 1) != NULL)
662 return;
663 printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
664
Trond Myklebust14b218a2005-06-22 17:16:28 +0000665 if (RPC_IS_ASYNC(task) || !signalled()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 xprt_release(task);
667 task->tk_action = call_reserve;
668 rpc_delay(task, HZ>>4);
669 return;
670 }
671
672 rpc_exit(task, -ERESTARTSYS);
673}
674
675/*
676 * 3. Encode arguments of an RPC call
677 */
678static void
679call_encode(struct rpc_task *task)
680{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 struct rpc_rqst *req = task->tk_rqstp;
682 struct xdr_buf *sndbuf = &req->rq_snd_buf;
683 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
684 unsigned int bufsiz;
685 kxdrproc_t encode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 u32 *p;
687
688 dprintk("RPC: %4d call_encode (status %d)\n",
689 task->tk_pid, task->tk_status);
690
691 /* Default buffer setup */
692 bufsiz = task->tk_bufsize >> 1;
693 sndbuf->head[0].iov_base = (void *)task->tk_buffer;
694 sndbuf->head[0].iov_len = bufsiz;
695 sndbuf->tail[0].iov_len = 0;
696 sndbuf->page_len = 0;
697 sndbuf->len = 0;
698 sndbuf->buflen = bufsiz;
699 rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
700 rcvbuf->head[0].iov_len = bufsiz;
701 rcvbuf->tail[0].iov_len = 0;
702 rcvbuf->page_len = 0;
703 rcvbuf->len = 0;
704 rcvbuf->buflen = bufsiz;
705
706 /* Encode header and provided arguments */
707 encode = task->tk_msg.rpc_proc->p_encode;
708 if (!(p = call_header(task))) {
709 printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
710 rpc_exit(task, -EIO);
711 return;
712 }
J. Bruce Fieldsf3680312005-10-13 16:54:48 -0400713 if (encode == NULL)
714 return;
715
716 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
717 task->tk_msg.rpc_argp);
718 if (task->tk_status == -ENOMEM) {
719 /* XXX: Is this sane? */
720 rpc_delay(task, 3*HZ);
721 task->tk_status = -EAGAIN;
722 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723}
724
725/*
726 * 4. Get the server port number if not yet set
727 */
728static void
729call_bind(struct rpc_task *task)
730{
731 struct rpc_clnt *clnt = task->tk_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Chuck Leverda351872005-08-11 16:25:11 -0400733 dprintk("RPC: %4d call_bind (status %d)\n",
734 task->tk_pid, task->tk_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Chuck Leverda351872005-08-11 16:25:11 -0400736 task->tk_action = call_connect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (!clnt->cl_port) {
Chuck Leverda351872005-08-11 16:25:11 -0400738 task->tk_action = call_bind_status;
Chuck Lever03bf4b72005-08-25 16:25:55 -0700739 task->tk_timeout = task->tk_xprt->bind_timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 rpc_getport(task, clnt);
741 }
742}
743
744/*
Chuck Leverda351872005-08-11 16:25:11 -0400745 * 4a. Sort out bind result
746 */
747static void
748call_bind_status(struct rpc_task *task)
749{
750 int status = -EACCES;
751
752 if (task->tk_status >= 0) {
753 dprintk("RPC: %4d call_bind_status (status %d)\n",
754 task->tk_pid, task->tk_status);
755 task->tk_status = 0;
756 task->tk_action = call_connect;
757 return;
758 }
759
760 switch (task->tk_status) {
761 case -EACCES:
762 dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n",
763 task->tk_pid);
Chuck Leverea635a52005-10-06 23:12:58 -0400764 rpc_delay(task, 3*HZ);
765 goto retry_bind;
Chuck Leverda351872005-08-11 16:25:11 -0400766 case -ETIMEDOUT:
767 dprintk("RPC: %4d rpcbind request timed out\n",
768 task->tk_pid);
769 if (RPC_IS_SOFT(task)) {
770 status = -EIO;
771 break;
772 }
773 goto retry_bind;
774 case -EPFNOSUPPORT:
775 dprintk("RPC: %4d remote rpcbind service unavailable\n",
776 task->tk_pid);
777 break;
778 case -EPROTONOSUPPORT:
779 dprintk("RPC: %4d remote rpcbind version 2 unavailable\n",
780 task->tk_pid);
781 break;
782 default:
783 dprintk("RPC: %4d unrecognized rpcbind error (%d)\n",
784 task->tk_pid, -task->tk_status);
785 status = -EIO;
786 break;
787 }
788
789 rpc_exit(task, status);
790 return;
791
792retry_bind:
793 task->tk_status = 0;
794 task->tk_action = call_bind;
795 return;
796}
797
798/*
799 * 4b. Connect to the RPC server
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 */
801static void
802call_connect(struct rpc_task *task)
803{
Chuck Leverda351872005-08-11 16:25:11 -0400804 struct rpc_xprt *xprt = task->tk_xprt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Chuck Leverda351872005-08-11 16:25:11 -0400806 dprintk("RPC: %4d call_connect xprt %p %s connected\n",
807 task->tk_pid, xprt,
808 (xprt_connected(xprt) ? "is" : "is not"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Chuck Leverda351872005-08-11 16:25:11 -0400810 task->tk_action = call_transmit;
811 if (!xprt_connected(xprt)) {
812 task->tk_action = call_connect_status;
813 if (task->tk_status < 0)
814 return;
815 xprt_connect(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817}
818
819/*
Chuck Leverda351872005-08-11 16:25:11 -0400820 * 4c. Sort out connect result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 */
822static void
823call_connect_status(struct rpc_task *task)
824{
825 struct rpc_clnt *clnt = task->tk_client;
826 int status = task->tk_status;
827
Chuck Leverda351872005-08-11 16:25:11 -0400828 dprintk("RPC: %5u call_connect_status (status %d)\n",
829 task->tk_pid, task->tk_status);
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 task->tk_status = 0;
832 if (status >= 0) {
833 clnt->cl_stats->netreconn++;
834 task->tk_action = call_transmit;
835 return;
836 }
837
Chuck Leverda351872005-08-11 16:25:11 -0400838 /* Something failed: remote service port may have changed */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 if (clnt->cl_autobind)
840 clnt->cl_port = 0;
Chuck Leverda351872005-08-11 16:25:11 -0400841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 switch (status) {
843 case -ENOTCONN:
844 case -ETIMEDOUT:
845 case -EAGAIN:
Chuck Leverda351872005-08-11 16:25:11 -0400846 task->tk_action = call_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 break;
848 default:
849 rpc_exit(task, -EIO);
Chuck Leverda351872005-08-11 16:25:11 -0400850 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 }
852}
853
854/*
855 * 5. Transmit the RPC request, and wait for reply
856 */
857static void
858call_transmit(struct rpc_task *task)
859{
860 dprintk("RPC: %4d call_transmit (status %d)\n",
861 task->tk_pid, task->tk_status);
862
863 task->tk_action = call_status;
864 if (task->tk_status < 0)
865 return;
866 task->tk_status = xprt_prepare_transmit(task);
867 if (task->tk_status != 0)
868 return;
869 /* Encode here so that rpcsec_gss can use correct sequence number. */
Trond Myklebust5e5ce5b2005-10-18 14:20:11 -0700870 if (task->tk_rqstp->rq_bytes_sent == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 call_encode(task);
Trond Myklebust5e5ce5b2005-10-18 14:20:11 -0700872 /* Did the encode result in an error condition? */
873 if (task->tk_status != 0)
874 goto out_nosend;
875 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 xprt_transmit(task);
877 if (task->tk_status < 0)
878 return;
879 if (!task->tk_msg.rpc_proc->p_decode) {
880 task->tk_action = NULL;
881 rpc_wake_up_task(task);
882 }
Trond Myklebust5e5ce5b2005-10-18 14:20:11 -0700883 return;
884out_nosend:
885 /* release socket write lock before attempting to handle error */
886 xprt_abort_transmit(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
889/*
890 * 6. Sort out the RPC call status
891 */
892static void
893call_status(struct rpc_task *task)
894{
895 struct rpc_clnt *clnt = task->tk_client;
896 struct rpc_rqst *req = task->tk_rqstp;
897 int status;
898
899 if (req->rq_received > 0 && !req->rq_bytes_sent)
900 task->tk_status = req->rq_received;
901
902 dprintk("RPC: %4d call_status (status %d)\n",
903 task->tk_pid, task->tk_status);
904
905 status = task->tk_status;
906 if (status >= 0) {
907 task->tk_action = call_decode;
908 return;
909 }
910
911 task->tk_status = 0;
912 switch(status) {
913 case -ETIMEDOUT:
914 task->tk_action = call_timeout;
915 break;
916 case -ECONNREFUSED:
917 case -ENOTCONN:
918 req->rq_bytes_sent = 0;
919 if (clnt->cl_autobind)
920 clnt->cl_port = 0;
921 task->tk_action = call_bind;
922 break;
923 case -EAGAIN:
924 task->tk_action = call_transmit;
925 break;
926 case -EIO:
927 /* shutdown or soft timeout */
928 rpc_exit(task, status);
929 break;
930 default:
931 if (clnt->cl_chatty)
932 printk("%s: RPC call returned error %d\n",
933 clnt->cl_protname, -status);
934 rpc_exit(task, status);
935 break;
936 }
937}
938
939/*
940 * 6a. Handle RPC timeout
941 * We do not release the request slot, so we keep using the
942 * same XID for all retransmits.
943 */
944static void
945call_timeout(struct rpc_task *task)
946{
947 struct rpc_clnt *clnt = task->tk_client;
948
949 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
950 dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
951 goto retry;
952 }
953
954 dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
955 if (RPC_IS_SOFT(task)) {
956 if (clnt->cl_chatty)
957 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
958 clnt->cl_protname, clnt->cl_server);
959 rpc_exit(task, -EIO);
960 return;
961 }
962
963 if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
964 task->tk_flags |= RPC_CALL_MAJORSEEN;
965 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
966 clnt->cl_protname, clnt->cl_server);
967 }
968 if (clnt->cl_autobind)
969 clnt->cl_port = 0;
970
971retry:
972 clnt->cl_stats->rpcretrans++;
973 task->tk_action = call_bind;
974 task->tk_status = 0;
975}
976
977/*
978 * 7. Decode the RPC reply
979 */
980static void
981call_decode(struct rpc_task *task)
982{
983 struct rpc_clnt *clnt = task->tk_client;
984 struct rpc_rqst *req = task->tk_rqstp;
985 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
986 u32 *p;
987
988 dprintk("RPC: %4d call_decode (status %d)\n",
989 task->tk_pid, task->tk_status);
990
991 if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
992 printk(KERN_NOTICE "%s: server %s OK\n",
993 clnt->cl_protname, clnt->cl_server);
994 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
995 }
996
997 if (task->tk_status < 12) {
998 if (!RPC_IS_SOFT(task)) {
999 task->tk_action = call_bind;
1000 clnt->cl_stats->rpcretrans++;
1001 goto out_retry;
1002 }
1003 printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
1004 clnt->cl_protname, task->tk_status);
1005 rpc_exit(task, -EIO);
1006 return;
1007 }
1008
1009 req->rq_rcv_buf.len = req->rq_private_buf.len;
1010
1011 /* Check that the softirq receive buffer is valid */
1012 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1013 sizeof(req->rq_rcv_buf)) != 0);
1014
1015 /* Verify the RPC header */
1016 if (!(p = call_verify(task))) {
1017 if (task->tk_action == NULL)
1018 return;
1019 goto out_retry;
1020 }
1021
1022 task->tk_action = NULL;
1023
1024 if (decode)
1025 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1026 task->tk_msg.rpc_resp);
1027 dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
1028 task->tk_status);
1029 return;
1030out_retry:
1031 req->rq_received = req->rq_private_buf.len = 0;
1032 task->tk_status = 0;
1033}
1034
1035/*
1036 * 8. Refresh the credentials if rejected by the server
1037 */
1038static void
1039call_refresh(struct rpc_task *task)
1040{
1041 dprintk("RPC: %4d call_refresh\n", task->tk_pid);
1042
1043 xprt_release(task); /* Must do to obtain new XID */
1044 task->tk_action = call_refreshresult;
1045 task->tk_status = 0;
1046 task->tk_client->cl_stats->rpcauthrefresh++;
1047 rpcauth_refreshcred(task);
1048}
1049
1050/*
1051 * 8a. Process the results of a credential refresh
1052 */
1053static void
1054call_refreshresult(struct rpc_task *task)
1055{
1056 int status = task->tk_status;
1057 dprintk("RPC: %4d call_refreshresult (status %d)\n",
1058 task->tk_pid, task->tk_status);
1059
1060 task->tk_status = 0;
1061 task->tk_action = call_reserve;
1062 if (status >= 0 && rpcauth_uptodatecred(task))
1063 return;
1064 if (status == -EACCES) {
1065 rpc_exit(task, -EACCES);
1066 return;
1067 }
1068 task->tk_action = call_refresh;
1069 if (status != -ETIMEDOUT)
1070 rpc_delay(task, 3*HZ);
1071 return;
1072}
1073
1074/*
1075 * Call header serialization
1076 */
1077static u32 *
1078call_header(struct rpc_task *task)
1079{
1080 struct rpc_clnt *clnt = task->tk_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 struct rpc_rqst *req = task->tk_rqstp;
1082 u32 *p = req->rq_svec[0].iov_base;
1083
1084 /* FIXME: check buffer size? */
Chuck Lever808012f2005-08-25 16:25:49 -07001085
1086 p = xprt_skip_transport_header(task->tk_xprt, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 *p++ = req->rq_xid; /* XID */
1088 *p++ = htonl(RPC_CALL); /* CALL */
1089 *p++ = htonl(RPC_VERSION); /* RPC version */
1090 *p++ = htonl(clnt->cl_prog); /* program number */
1091 *p++ = htonl(clnt->cl_vers); /* program version */
1092 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
Trond Myklebust334ccfd2005-06-22 17:16:19 +00001093 p = rpcauth_marshcred(task, p);
1094 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
1095 return p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096}
1097
1098/*
1099 * Reply header verification
1100 */
1101static u32 *
1102call_verify(struct rpc_task *task)
1103{
1104 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
1105 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
1106 u32 *p = iov->iov_base, n;
1107 int error = -EACCES;
1108
1109 if ((len -= 3) < 0)
1110 goto out_overflow;
1111 p += 1; /* skip XID */
1112
1113 if ((n = ntohl(*p++)) != RPC_REPLY) {
1114 printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
1115 goto out_retry;
1116 }
1117 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
1118 if (--len < 0)
1119 goto out_overflow;
1120 switch ((n = ntohl(*p++))) {
1121 case RPC_AUTH_ERROR:
1122 break;
1123 case RPC_MISMATCH:
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001124 dprintk("%s: RPC call version mismatch!\n", __FUNCTION__);
1125 error = -EPROTONOSUPPORT;
1126 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 default:
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001128 dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 goto out_eio;
1130 }
1131 if (--len < 0)
1132 goto out_overflow;
1133 switch ((n = ntohl(*p++))) {
1134 case RPC_AUTH_REJECTEDCRED:
1135 case RPC_AUTH_REJECTEDVERF:
1136 case RPCSEC_GSS_CREDPROBLEM:
1137 case RPCSEC_GSS_CTXPROBLEM:
1138 if (!task->tk_cred_retry)
1139 break;
1140 task->tk_cred_retry--;
1141 dprintk("RPC: %4d call_verify: retry stale creds\n",
1142 task->tk_pid);
1143 rpcauth_invalcred(task);
1144 task->tk_action = call_refresh;
1145 return NULL;
1146 case RPC_AUTH_BADCRED:
1147 case RPC_AUTH_BADVERF:
1148 /* possibly garbled cred/verf? */
1149 if (!task->tk_garb_retry)
1150 break;
1151 task->tk_garb_retry--;
1152 dprintk("RPC: %4d call_verify: retry garbled creds\n",
1153 task->tk_pid);
1154 task->tk_action = call_bind;
1155 return NULL;
1156 case RPC_AUTH_TOOWEAK:
1157 printk(KERN_NOTICE "call_verify: server requires stronger "
1158 "authentication.\n");
1159 break;
1160 default:
1161 printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
1162 error = -EIO;
1163 }
1164 dprintk("RPC: %4d call_verify: call rejected %d\n",
1165 task->tk_pid, n);
1166 goto out_err;
1167 }
1168 if (!(p = rpcauth_checkverf(task, p))) {
1169 printk(KERN_WARNING "call_verify: auth check failed\n");
1170 goto out_retry; /* bad verifier, retry */
1171 }
1172 len = p - (u32 *)iov->iov_base - 1;
1173 if (len < 0)
1174 goto out_overflow;
1175 switch ((n = ntohl(*p++))) {
1176 case RPC_SUCCESS:
1177 return p;
1178 case RPC_PROG_UNAVAIL:
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001179 dprintk("RPC: call_verify: program %u is unsupported by server %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 (unsigned int)task->tk_client->cl_prog,
1181 task->tk_client->cl_server);
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001182 error = -EPFNOSUPPORT;
1183 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 case RPC_PROG_MISMATCH:
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001185 dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 (unsigned int)task->tk_client->cl_prog,
1187 (unsigned int)task->tk_client->cl_vers,
1188 task->tk_client->cl_server);
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001189 error = -EPROTONOSUPPORT;
1190 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 case RPC_PROC_UNAVAIL:
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001192 dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 task->tk_msg.rpc_proc,
1194 task->tk_client->cl_prog,
1195 task->tk_client->cl_vers,
1196 task->tk_client->cl_server);
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001197 error = -EOPNOTSUPP;
1198 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 case RPC_GARBAGE_ARGS:
1200 dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__);
1201 break; /* retry */
1202 default:
1203 printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
1204 /* Also retry */
1205 }
1206
1207out_retry:
1208 task->tk_client->cl_stats->rpcgarbage++;
1209 if (task->tk_garb_retry) {
1210 task->tk_garb_retry--;
Andreas Gruenbachercdf47702005-06-22 17:16:23 +00001211 dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 task->tk_action = call_bind;
1213 return NULL;
1214 }
1215 printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
1216out_eio:
1217 error = -EIO;
1218out_err:
1219 rpc_exit(task, error);
1220 return NULL;
1221out_overflow:
1222 printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);
1223 goto out_retry;
1224}
Trond Myklebust5ee0ed72005-06-22 17:16:20 +00001225
1226static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj)
1227{
1228 return 0;
1229}
1230
1231static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj)
1232{
1233 return 0;
1234}
1235
1236static struct rpc_procinfo rpcproc_null = {
1237 .p_encode = rpcproc_encode_null,
1238 .p_decode = rpcproc_decode_null,
1239};
1240
1241int rpc_ping(struct rpc_clnt *clnt, int flags)
1242{
1243 struct rpc_message msg = {
1244 .rpc_proc = &rpcproc_null,
1245 };
1246 int err;
1247 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
1248 err = rpc_call_sync(clnt, &msg, flags);
1249 put_rpccred(msg.rpc_cred);
1250 return err;
1251}