projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] RPC: Make rpc_create_client() destroy the transport on failure.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sunrpc / clnt.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/net/sunrpc/rpcclnt.c
3 *
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>
30#include <linux/in.h>
31#include <linux/utsname.h>
32
33#include <linux/sunrpc/clnt.h>
34#include <linux/workqueue.h>
35#include <linux/sunrpc/rpc_pipe_fs.h>
36
37#include <linux/nfs.h>
38
39
40#define RPC_SLACK_SPACE (1024) /* total overkill */
41
42#ifdef RPC_DEBUG
43# define RPCDBG_FACILITY RPCDBG_CALL
44#endif
45
46static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
47
48
49static void call_start(struct rpc_task *task);
50static void call_reserve(struct rpc_task *task);
51static void call_reserveresult(struct rpc_task *task);
52static void call_allocate(struct rpc_task *task);
53static void call_encode(struct rpc_task *task);
54static void call_decode(struct rpc_task *task);
55static void call_bind(struct rpc_task *task);
56static 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{
70 static uint32_t clntid;
71 int error;
72
73 if (dir_name == NULL)
74 return 0;
75 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;
83 error = PTR_ERR(clnt->cl_dentry);
84 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 }
89 }
90}
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 *
100rpc_create_client(struct rpc_xprt *xprt, char *servname,
101 struct rpc_program *program, u32 vers,
102 rpc_authflavor_t flavor)
103{
104 struct rpc_version *version;
105 struct rpc_clnt *clnt = NULL;
106 int err;
107 int len;
108
109 dprintk("RPC: creating %s client for %s (xprt %p)\n",
110 program->name, servname, xprt);
111
112 err = -EINVAL;
113 if (!xprt)
114 goto out_err;
115 if (vers >= program->nrvers || !(version = program->version[vers]))
116 goto out_err;
117
118 err = -ENOMEM;
119 clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL);
120 if (!clnt)
121 goto out_err;
122 memset(clnt, 0, sizeof(*clnt));
123 atomic_set(&clnt->cl_users, 0);
124 atomic_set(&clnt->cl_count, 1);
125 clnt->cl_parent = clnt;
126
127 clnt->cl_server = clnt->cl_inline_name;
128 len = strlen(servname) + 1;
129 if (len > sizeof(clnt->cl_inline_name)) {
130 char *buf = kmalloc(len, GFP_KERNEL);
131 if (buf != 0)
132 clnt->cl_server = buf;
133 else
134 len = sizeof(clnt->cl_inline_name);
135 }
136 strlcpy(clnt->cl_server, servname, len);
137
138 clnt->cl_xprt = xprt;
139 clnt->cl_procinfo = version->procs;
140 clnt->cl_maxproc = version->nrprocs;
141 clnt->cl_protname = program->name;
142 clnt->cl_pmap = &clnt->cl_pmap_default;
143 clnt->cl_port = xprt->addr.sin_port;
144 clnt->cl_prog = program->number;
145 clnt->cl_vers = version->number;
146 clnt->cl_prot = xprt->prot;
147 clnt->cl_stats = program->stats;
148 rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
149
150 if (!clnt->cl_port)
151 clnt->cl_autobind = 1;
152
153 clnt->cl_rtt = &clnt->cl_rtt_default;
154 rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
155
156 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
157 if (err < 0)
158 goto out_no_path;
159
160 err = -ENOMEM;
161 if (!rpcauth_create(flavor, clnt)) {
162 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
163 flavor);
164 goto out_no_auth;
165 }
166
167 /* save the nodename */
168 clnt->cl_nodelen = strlen(system_utsname.nodename);
169 if (clnt->cl_nodelen > UNX_MAXNODENAME)
170 clnt->cl_nodelen = UNX_MAXNODENAME;
171 memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
172 return clnt;
173
174out_no_auth:
175 rpc_rmdir(clnt->cl_pathname);
176out_no_path:
177 if (clnt->cl_server != clnt->cl_inline_name)
178 kfree(clnt->cl_server);
179 kfree(clnt);
180out_err:
5b616f5d 181 xprt_destroy(xprt);
1da177e4
LT		 182 return ERR_PTR(err);
183}
184
185/*
186 * This function clones the RPC client structure. It allows us to share the
187 * same transport while varying parameters such as the authentication
188 * flavour.
189 */
190struct rpc_clnt *
191rpc_clone_client(struct rpc_clnt *clnt)
192{
193 struct rpc_clnt *new;
194
195 new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
196 if (!new)
197 goto out_no_clnt;
198 memcpy(new, clnt, sizeof(*new));
199 atomic_set(&new->cl_count, 1);
200 atomic_set(&new->cl_users, 0);
201 new->cl_parent = clnt;
202 atomic_inc(&clnt->cl_count);
203 /* Duplicate portmapper */
204 rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
205 /* Turn off autobind on clones */
206 new->cl_autobind = 0;
207 new->cl_oneshot = 0;
208 new->cl_dead = 0;
209 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
210 if (new->cl_auth)
211 atomic_inc(&new->cl_auth->au_count);
212 return new;
213out_no_clnt:
214 printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
215 return ERR_PTR(-ENOMEM);
216}
217
218/*
219 * Properly shut down an RPC client, terminating all outstanding
220 * requests. Note that we must be certain that cl_oneshot and
221 * cl_dead are cleared, or else the client would be destroyed
222 * when the last task releases it.
223 */
224int
225rpc_shutdown_client(struct rpc_clnt *clnt)
226{
227 dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
228 clnt->cl_protname, clnt->cl_server,
229 atomic_read(&clnt->cl_users));
230
231 while (atomic_read(&clnt->cl_users) > 0) {
232 /* Don't let rpc_release_client destroy us */
233 clnt->cl_oneshot = 0;
234 clnt->cl_dead = 0;
235 rpc_killall_tasks(clnt);
236 sleep_on_timeout(&destroy_wait, 1*HZ);
237 }
238
239 if (atomic_read(&clnt->cl_users) < 0) {
240 printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
241 clnt, atomic_read(&clnt->cl_users));
242#ifdef RPC_DEBUG
243 rpc_show_tasks();
244#endif
245 BUG();
246 }
247
248 return rpc_destroy_client(clnt);
249}
250
251/*
252 * Delete an RPC client
253 */
254int
255rpc_destroy_client(struct rpc_clnt *clnt)
256{
257 if (!atomic_dec_and_test(&clnt->cl_count))
258 return 1;
259 BUG_ON(atomic_read(&clnt->cl_users) != 0);
260
261 dprintk("RPC: destroying %s client for %s\n",
262 clnt->cl_protname, clnt->cl_server);
263 if (clnt->cl_auth) {
264 rpcauth_destroy(clnt->cl_auth);
265 clnt->cl_auth = NULL;
266 }
267 if (clnt->cl_parent != clnt) {
268 rpc_destroy_client(clnt->cl_parent);
269 goto out_free;
270 }
271 if (clnt->cl_pathname[0])
272 rpc_rmdir(clnt->cl_pathname);
273 if (clnt->cl_xprt) {
274 xprt_destroy(clnt->cl_xprt);
275 clnt->cl_xprt = NULL;
276 }
277 if (clnt->cl_server != clnt->cl_inline_name)
278 kfree(clnt->cl_server);
279out_free:
280 kfree(clnt);
281 return 0;
282}
283
284/*
285 * Release an RPC client
286 */
287void
288rpc_release_client(struct rpc_clnt *clnt)
289{
290 dprintk("RPC: rpc_release_client(%p, %d)\n",
291 clnt, atomic_read(&clnt->cl_users));
292
293 if (!atomic_dec_and_test(&clnt->cl_users))
294 return;
295 wake_up(&destroy_wait);
296 if (clnt->cl_oneshot || clnt->cl_dead)
297 rpc_destroy_client(clnt);
298}
299
300/*
301 * Default callback for async RPC calls
302 */
303static void
304rpc_default_callback(struct rpc_task *task)
305{
306}
307
308/*
309 * Export the signal mask handling for aysnchronous code that
310 * sleeps on RPC calls
311 */
312
313void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
314{
315 unsigned long sigallow = sigmask(SIGKILL);
316 unsigned long irqflags;
317
318 /* Turn off various signals */
319 if (clnt->cl_intr) {
320 struct k_sigaction *action = current->sighand->action;
321 if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
322 sigallow |= sigmask(SIGINT);
323 if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
324 sigallow |= sigmask(SIGQUIT);
325 }
326 spin_lock_irqsave(&current->sighand->siglock, irqflags);
327 *oldset = current->blocked;
328 siginitsetinv(&current->blocked, sigallow & ~oldset->sig[0]);
329 recalc_sigpending();
330 spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
331}
332
333void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
334{
335 unsigned long irqflags;
336
337 spin_lock_irqsave(&current->sighand->siglock, irqflags);
338 current->blocked = *oldset;
339 recalc_sigpending();
340 spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
341}
342
343/*
344 * New rpc_call implementation
345 */
346int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
347{
348 struct rpc_task *task;
349 sigset_t oldset;
350 int status;
351
352 /* If this client is slain all further I/O fails */
353 if (clnt->cl_dead)
354 return -EIO;
355
356 BUG_ON(flags & RPC_TASK_ASYNC);
357
358 rpc_clnt_sigmask(clnt, &oldset);
359
360 status = -ENOMEM;
361 task = rpc_new_task(clnt, NULL, flags);
362 if (task == NULL)
363 goto out;
364
365 rpc_call_setup(task, msg, 0);
366
367 /* Set up the call info struct and execute the task */
368 if (task->tk_status == 0)
369 status = rpc_execute(task);
370 else {
371 status = task->tk_status;
372 rpc_release_task(task);
373 }
374
375out:
376 rpc_clnt_sigunmask(clnt, &oldset);
377
378 return status;
379}
380
381/*
382 * New rpc_call implementation
383 */
384int
385rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
386 rpc_action callback, void *data)
387{
388 struct rpc_task *task;
389 sigset_t oldset;
390 int status;
391
392 /* If this client is slain all further I/O fails */
393 if (clnt->cl_dead)
394 return -EIO;
395
396 flags |= RPC_TASK_ASYNC;
397
398 rpc_clnt_sigmask(clnt, &oldset);
399
400 /* Create/initialize a new RPC task */
401 if (!callback)
402 callback = rpc_default_callback;
403 status = -ENOMEM;
404 if (!(task = rpc_new_task(clnt, callback, flags)))
405 goto out;
406 task->tk_calldata = data;
407
408 rpc_call_setup(task, msg, 0);
409
410 /* Set up the call info struct and execute the task */
411 status = task->tk_status;
412 if (status == 0)
413 rpc_execute(task);
414 else
415 rpc_release_task(task);
416
417out:
418 rpc_clnt_sigunmask(clnt, &oldset);
419
420 return status;
421}
422
423
424void
425rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
426{
427 task->tk_msg = *msg;
428 task->tk_flags |= flags;
429 /* Bind the user cred */
430 if (task->tk_msg.rpc_cred != NULL)
431 rpcauth_holdcred(task);
432 else
433 rpcauth_bindcred(task);
434
435 if (task->tk_status == 0)
436 task->tk_action = call_start;
437 else
438 task->tk_action = NULL;
439}
440
441void
442rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
443{
444 struct rpc_xprt *xprt = clnt->cl_xprt;
445
446 xprt->sndsize = 0;
447 if (sndsize)
448 xprt->sndsize = sndsize + RPC_SLACK_SPACE;
449 xprt->rcvsize = 0;
450 if (rcvsize)
451 xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
452 if (xprt_connected(xprt))
453 xprt_sock_setbufsize(xprt);
454}
455
456/*
457 * Return size of largest payload RPC client can support, in bytes
458 *
459 * For stream transports, this is one RPC record fragment (see RFC
460 * 1831), as we don't support multi-record requests yet. For datagram
461 * transports, this is the size of an IP packet minus the IP, UDP, and
462 * RPC header sizes.
463 */
464size_t rpc_max_payload(struct rpc_clnt *clnt)
465{
466 return clnt->cl_xprt->max_payload;
467}
468EXPORT_SYMBOL(rpc_max_payload);
469
470/*
471 * Restart an (async) RPC call. Usually called from within the
472 * exit handler.
473 */
474void
475rpc_restart_call(struct rpc_task *task)
476{
477 if (RPC_ASSASSINATED(task))
478 return;
479
480 task->tk_action = call_start;
481}
482
483/*
484 * 0. Initial state
485 *
486 * Other FSM states can be visited zero or more times, but
487 * this state is visited exactly once for each RPC.
488 */
489static void
490call_start(struct rpc_task *task)
491{
492 struct rpc_clnt *clnt = task->tk_client;
493
494 dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
495 clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
496 (RPC_IS_ASYNC(task) ? "async" : "sync"));
497
498 /* Increment call count */
499 task->tk_msg.rpc_proc->p_count++;
500 clnt->cl_stats->rpccnt++;
501 task->tk_action = call_reserve;
502}
503
504/*
505 * 1. Reserve an RPC call slot
506 */
507static void
508call_reserve(struct rpc_task *task)
509{
510 dprintk("RPC: %4d call_reserve\n", task->tk_pid);
511
512 if (!rpcauth_uptodatecred(task)) {
513 task->tk_action = call_refresh;
514 return;
515 }
516
517 task->tk_status = 0;
518 task->tk_action = call_reserveresult;
519 xprt_reserve(task);
520}
521
522/*
523 * 1b. Grok the result of xprt_reserve()
524 */
525static void
526call_reserveresult(struct rpc_task *task)
527{
528 int status = task->tk_status;
529
530 dprintk("RPC: %4d call_reserveresult (status %d)\n",
531 task->tk_pid, task->tk_status);
532
533 /*
534 * After a call to xprt_reserve(), we must have either
535 * a request slot or else an error status.
536 */
537 task->tk_status = 0;
538 if (status >= 0) {
539 if (task->tk_rqstp) {
540 task->tk_action = call_allocate;
541 return;
542 }
543
544 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
545 __FUNCTION__, status);
546 rpc_exit(task, -EIO);
547 return;
548 }
549
550 /*
551 * Even though there was an error, we may have acquired
552 * a request slot somehow. Make sure not to leak it.
553 */
554 if (task->tk_rqstp) {
555 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
556 __FUNCTION__, status);
557 xprt_release(task);
558 }
559
560 switch (status) {
561 case -EAGAIN: /* woken up; retry */
562 task->tk_action = call_reserve;
563 return;
564 case -EIO: /* probably a shutdown */
565 break;
566 default:
567 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
568 __FUNCTION__, status);
569 break;
570 }
571 rpc_exit(task, status);
572}
573
574/*
575 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
576 * (Note: buffer memory is freed in rpc_task_release).
577 */
578static void
579call_allocate(struct rpc_task *task)
580{
581 unsigned int bufsiz;
582
583 dprintk("RPC: %4d call_allocate (status %d)\n",
584 task->tk_pid, task->tk_status);
585 task->tk_action = call_bind;
586 if (task->tk_buffer)
587 return;
588
589 /* FIXME: compute buffer requirements more exactly using
590 * auth->au_wslack */
591 bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
592
593 if (rpc_malloc(task, bufsiz << 1) != NULL)
594 return;
595 printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
596
597 if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
598 xprt_release(task);
599 task->tk_action = call_reserve;
600 rpc_delay(task, HZ>>4);
601 return;
602 }
603
604 rpc_exit(task, -ERESTARTSYS);
605}
606
607/*
608 * 3. Encode arguments of an RPC call
609 */
610static void
611call_encode(struct rpc_task *task)
612{
613 struct rpc_clnt *clnt = task->tk_client;
614 struct rpc_rqst *req = task->tk_rqstp;
615 struct xdr_buf *sndbuf = &req->rq_snd_buf;
616 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
617 unsigned int bufsiz;
618 kxdrproc_t encode;
619 int status;
620 u32 *p;
621
622 dprintk("RPC: %4d call_encode (status %d)\n",
623 task->tk_pid, task->tk_status);
624
625 /* Default buffer setup */
626 bufsiz = task->tk_bufsize >> 1;
627 sndbuf->head[0].iov_base = (void *)task->tk_buffer;
628 sndbuf->head[0].iov_len = bufsiz;
629 sndbuf->tail[0].iov_len = 0;
630 sndbuf->page_len = 0;
631 sndbuf->len = 0;
632 sndbuf->buflen = bufsiz;
633 rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
634 rcvbuf->head[0].iov_len = bufsiz;
635 rcvbuf->tail[0].iov_len = 0;
636 rcvbuf->page_len = 0;
637 rcvbuf->len = 0;
638 rcvbuf->buflen = bufsiz;
639
640 /* Encode header and provided arguments */
641 encode = task->tk_msg.rpc_proc->p_encode;
642 if (!(p = call_header(task))) {
643 printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
644 rpc_exit(task, -EIO);
645 return;
646 }
647 if (encode && (status = rpcauth_wrap_req(task, encode, req, p,
648 task->tk_msg.rpc_argp)) < 0) {
649 printk(KERN_WARNING "%s: can't encode arguments: %d\n",
650 clnt->cl_protname, -status);
651 rpc_exit(task, status);
652 }
653}
654
655/*
656 * 4. Get the server port number if not yet set
657 */
658static void
659call_bind(struct rpc_task *task)
660{
661 struct rpc_clnt *clnt = task->tk_client;
662 struct rpc_xprt *xprt = clnt->cl_xprt;
663
664 dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
665 xprt, (xprt_connected(xprt) ? "is" : "is not"));
666
667 task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
668
669 if (!clnt->cl_port) {
670 task->tk_action = call_connect;
671 task->tk_timeout = RPC_CONNECT_TIMEOUT;
672 rpc_getport(task, clnt);
673 }
674}
675
676/*
677 * 4a. Connect to the RPC server (TCP case)
678 */
679static void
680call_connect(struct rpc_task *task)
681{
682 struct rpc_clnt *clnt = task->tk_client;
683
684 dprintk("RPC: %4d call_connect status %d\n",
685 task->tk_pid, task->tk_status);
686
687 if (xprt_connected(clnt->cl_xprt)) {
688 task->tk_action = call_transmit;
689 return;
690 }
691 task->tk_action = call_connect_status;
692 if (task->tk_status < 0)
693 return;
694 xprt_connect(task);
695}
696
697/*
698 * 4b. Sort out connect result
699 */
700static void
701call_connect_status(struct rpc_task *task)
702{
703 struct rpc_clnt *clnt = task->tk_client;
704 int status = task->tk_status;
705
706 task->tk_status = 0;
707 if (status >= 0) {
708 clnt->cl_stats->netreconn++;
709 task->tk_action = call_transmit;
710 return;
711 }
712
713 /* Something failed: we may have to rebind */
714 if (clnt->cl_autobind)
715 clnt->cl_port = 0;
716 switch (status) {
717 case -ENOTCONN:
718 case -ETIMEDOUT:
719 case -EAGAIN:
720 task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
721 break;
722 default:
723 rpc_exit(task, -EIO);
724 }
725}
726
727/*
728 * 5. Transmit the RPC request, and wait for reply
729 */
730static void
731call_transmit(struct rpc_task *task)
732{
733 dprintk("RPC: %4d call_transmit (status %d)\n",
734 task->tk_pid, task->tk_status);
735
736 task->tk_action = call_status;
737 if (task->tk_status < 0)
738 return;
739 task->tk_status = xprt_prepare_transmit(task);
740 if (task->tk_status != 0)
741 return;
742 /* Encode here so that rpcsec_gss can use correct sequence number. */
743 if (!task->tk_rqstp->rq_bytes_sent)
744 call_encode(task);
745 if (task->tk_status < 0)
746 return;
747 xprt_transmit(task);
748 if (task->tk_status < 0)
749 return;
750 if (!task->tk_msg.rpc_proc->p_decode) {
751 task->tk_action = NULL;
752 rpc_wake_up_task(task);
753 }
754}
755
756/*
757 * 6. Sort out the RPC call status
758 */
759static void
760call_status(struct rpc_task *task)
761{
762 struct rpc_clnt *clnt = task->tk_client;
763 struct rpc_rqst *req = task->tk_rqstp;
764 int status;
765
766 if (req->rq_received > 0 && !req->rq_bytes_sent)
767 task->tk_status = req->rq_received;
768
769 dprintk("RPC: %4d call_status (status %d)\n",
770 task->tk_pid, task->tk_status);
771
772 status = task->tk_status;
773 if (status >= 0) {
774 task->tk_action = call_decode;
775 return;
776 }
777
778 task->tk_status = 0;
779 switch(status) {
780 case -ETIMEDOUT:
781 task->tk_action = call_timeout;
782 break;
783 case -ECONNREFUSED:
784 case -ENOTCONN:
785 req->rq_bytes_sent = 0;
786 if (clnt->cl_autobind)
787 clnt->cl_port = 0;
788 task->tk_action = call_bind;
789 break;
790 case -EAGAIN:
791 task->tk_action = call_transmit;
792 break;
793 case -EIO:
794 /* shutdown or soft timeout */
795 rpc_exit(task, status);
796 break;
797 default:
798 if (clnt->cl_chatty)
799 printk("%s: RPC call returned error %d\n",
800 clnt->cl_protname, -status);
801 rpc_exit(task, status);
802 break;
803 }
804}
805
806/*
807 * 6a. Handle RPC timeout
808 * We do not release the request slot, so we keep using the
809 * same XID for all retransmits.
810 */
811static void
812call_timeout(struct rpc_task *task)
813{
814 struct rpc_clnt *clnt = task->tk_client;
815
816 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
817 dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
818 goto retry;
819 }
820
821 dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
822 if (RPC_IS_SOFT(task)) {
823 if (clnt->cl_chatty)
824 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
825 clnt->cl_protname, clnt->cl_server);
826 rpc_exit(task, -EIO);
827 return;
828 }
829
830 if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
831 task->tk_flags |= RPC_CALL_MAJORSEEN;
832 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
833 clnt->cl_protname, clnt->cl_server);
834 }
835 if (clnt->cl_autobind)
836 clnt->cl_port = 0;
837
838retry:
839 clnt->cl_stats->rpcretrans++;
840 task->tk_action = call_bind;
841 task->tk_status = 0;
842}
843
844/*
845 * 7. Decode the RPC reply
846 */
847static void
848call_decode(struct rpc_task *task)
849{
850 struct rpc_clnt *clnt = task->tk_client;
851 struct rpc_rqst *req = task->tk_rqstp;
852 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
853 u32 *p;
854
855 dprintk("RPC: %4d call_decode (status %d)\n",
856 task->tk_pid, task->tk_status);
857
858 if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
859 printk(KERN_NOTICE "%s: server %s OK\n",
860 clnt->cl_protname, clnt->cl_server);
861 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
862 }
863
864 if (task->tk_status < 12) {
865 if (!RPC_IS_SOFT(task)) {
866 task->tk_action = call_bind;
867 clnt->cl_stats->rpcretrans++;
868 goto out_retry;
869 }
870 printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
871 clnt->cl_protname, task->tk_status);
872 rpc_exit(task, -EIO);
873 return;
874 }
875
876 req->rq_rcv_buf.len = req->rq_private_buf.len;
877
878 /* Check that the softirq receive buffer is valid */
879 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
880 sizeof(req->rq_rcv_buf)) != 0);
881
882 /* Verify the RPC header */
883 if (!(p = call_verify(task))) {
884 if (task->tk_action == NULL)
885 return;
886 goto out_retry;
887 }
888
889 task->tk_action = NULL;
890
891 if (decode)
892 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
893 task->tk_msg.rpc_resp);
894 dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
895 task->tk_status);
896 return;
897out_retry:
898 req->rq_received = req->rq_private_buf.len = 0;
899 task->tk_status = 0;
900}
901
902/*
903 * 8. Refresh the credentials if rejected by the server
904 */
905static void
906call_refresh(struct rpc_task *task)
907{
908 dprintk("RPC: %4d call_refresh\n", task->tk_pid);
909
910 xprt_release(task); /* Must do to obtain new XID */
911 task->tk_action = call_refreshresult;
912 task->tk_status = 0;
913 task->tk_client->cl_stats->rpcauthrefresh++;
914 rpcauth_refreshcred(task);
915}
916
917/*
918 * 8a. Process the results of a credential refresh
919 */
920static void
921call_refreshresult(struct rpc_task *task)
922{
923 int status = task->tk_status;
924 dprintk("RPC: %4d call_refreshresult (status %d)\n",
925 task->tk_pid, task->tk_status);
926
927 task->tk_status = 0;
928 task->tk_action = call_reserve;
929 if (status >= 0 && rpcauth_uptodatecred(task))
930 return;
931 if (status == -EACCES) {
932 rpc_exit(task, -EACCES);
933 return;
934 }
935 task->tk_action = call_refresh;
936 if (status != -ETIMEDOUT)
937 rpc_delay(task, 3*HZ);
938 return;
939}
940
941/*
942 * Call header serialization
943 */
944static u32 *
945call_header(struct rpc_task *task)
946{
947 struct rpc_clnt *clnt = task->tk_client;
948 struct rpc_xprt *xprt = clnt->cl_xprt;
949 struct rpc_rqst *req = task->tk_rqstp;
950 u32 *p = req->rq_svec[0].iov_base;
951
952 /* FIXME: check buffer size? */
953 if (xprt->stream)
954 *p++ = 0; /* fill in later */
955 *p++ = req->rq_xid; /* XID */
956 *p++ = htonl(RPC_CALL); /* CALL */
957 *p++ = htonl(RPC_VERSION); /* RPC version */
958 *p++ = htonl(clnt->cl_prog); /* program number */
959 *p++ = htonl(clnt->cl_vers); /* program version */
960 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
334ccfd5
TM		 961 p = rpcauth_marshcred(task, p);
962 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
963 return p;
1da177e4
LT		 964}
965
966/*
967 * Reply header verification
968 */
969static u32 *
970call_verify(struct rpc_task *task)
971{
972 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
973 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
974 u32 *p = iov->iov_base, n;
975 int error = -EACCES;
976
977 if ((len -= 3) < 0)
978 goto out_overflow;
979 p += 1; /* skip XID */
980
981 if ((n = ntohl(*p++)) != RPC_REPLY) {
982 printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
983 goto out_retry;
984 }
985 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
986 if (--len < 0)
987 goto out_overflow;
988 switch ((n = ntohl(*p++))) {
989 case RPC_AUTH_ERROR:
990 break;
991 case RPC_MISMATCH:
992 printk(KERN_WARNING "%s: RPC call version mismatch!\n", __FUNCTION__);
993 goto out_eio;
994 default:
995 printk(KERN_WARNING "%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n);
996 goto out_eio;
997 }
998 if (--len < 0)
999 goto out_overflow;
1000 switch ((n = ntohl(*p++))) {
1001 case RPC_AUTH_REJECTEDCRED:
1002 case RPC_AUTH_REJECTEDVERF:
1003 case RPCSEC_GSS_CREDPROBLEM:
1004 case RPCSEC_GSS_CTXPROBLEM:
1005 if (!task->tk_cred_retry)
1006 break;
1007 task->tk_cred_retry--;
1008 dprintk("RPC: %4d call_verify: retry stale creds\n",
1009 task->tk_pid);
1010 rpcauth_invalcred(task);
1011 task->tk_action = call_refresh;
1012 return NULL;
1013 case RPC_AUTH_BADCRED:
1014 case RPC_AUTH_BADVERF:
1015 /* possibly garbled cred/verf? */
1016 if (!task->tk_garb_retry)
1017 break;
1018 task->tk_garb_retry--;
1019 dprintk("RPC: %4d call_verify: retry garbled creds\n",
1020 task->tk_pid);
1021 task->tk_action = call_bind;
1022 return NULL;
1023 case RPC_AUTH_TOOWEAK:
1024 printk(KERN_NOTICE "call_verify: server requires stronger "
1025 "authentication.\n");
1026 break;
1027 default:
1028 printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
1029 error = -EIO;
1030 }
1031 dprintk("RPC: %4d call_verify: call rejected %d\n",
1032 task->tk_pid, n);
1033 goto out_err;
1034 }
1035 if (!(p = rpcauth_checkverf(task, p))) {
1036 printk(KERN_WARNING "call_verify: auth check failed\n");
1037 goto out_retry; /* bad verifier, retry */
1038 }
1039 len = p - (u32 *)iov->iov_base - 1;
1040 if (len < 0)
1041 goto out_overflow;
1042 switch ((n = ntohl(*p++))) {
1043 case RPC_SUCCESS:
1044 return p;
1045 case RPC_PROG_UNAVAIL:
1046 printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
1047 (unsigned int)task->tk_client->cl_prog,
1048 task->tk_client->cl_server);
1049 goto out_eio;
1050 case RPC_PROG_MISMATCH:
1051 printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
1052 (unsigned int)task->tk_client->cl_prog,
1053 (unsigned int)task->tk_client->cl_vers,
1054 task->tk_client->cl_server);
1055 goto out_eio;
1056 case RPC_PROC_UNAVAIL:
1057 printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
1058 task->tk_msg.rpc_proc,
1059 task->tk_client->cl_prog,
1060 task->tk_client->cl_vers,
1061 task->tk_client->cl_server);
1062 goto out_eio;
1063 case RPC_GARBAGE_ARGS:
1064 dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__);
1065 break; /* retry */
1066 default:
1067 printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
1068 /* Also retry */
1069 }
1070
1071out_retry:
1072 task->tk_client->cl_stats->rpcgarbage++;
1073 if (task->tk_garb_retry) {
1074 task->tk_garb_retry--;
1075 dprintk(KERN_WARNING "RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid);
1076 task->tk_action = call_bind;
1077 return NULL;
1078 }
1079 printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
1080out_eio:
1081 error = -EIO;
1082out_err:
1083 rpc_exit(task, error);
1084 return NULL;
1085out_overflow:
1086 printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);
1087 goto out_retry;
1088}
kernel source for telekom puls (alcatel/mediatek)