projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'next/kvm' into mips-for-linux-next
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sunrpc / clnt.c
1 /*
2 * linux/net/sunrpc/clnt.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 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
17 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
18 */
19
20
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/kallsyms.h>
24 #include <linux/mm.h>
25 #include <linux/namei.h>
26 #include <linux/mount.h>
27 #include <linux/slab.h>
28 #include <linux/utsname.h>
29 #include <linux/workqueue.h>
30 #include <linux/in.h>
31 #include <linux/in6.h>
32 #include <linux/un.h>
33 #include <linux/rcupdate.h>
34
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/rpc_pipe_fs.h>
38 #include <linux/sunrpc/metrics.h>
39 #include <linux/sunrpc/bc_xprt.h>
40 #include <trace/events/sunrpc.h>
41
42 #include "sunrpc.h"
43 #include "netns.h"
44
45 #ifdef RPC_DEBUG
46 # define RPCDBG_FACILITY RPCDBG_CALL
47 #endif
48
49 #define dprint_status(t) \
50 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
51 __func__, t->tk_status)
52
53 /*
54 * All RPC clients are linked into this list
55 */
56
57 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
58
59
60 static void call_start(struct rpc_task *task);
61 static void call_reserve(struct rpc_task *task);
62 static void call_reserveresult(struct rpc_task *task);
63 static void call_allocate(struct rpc_task *task);
64 static void call_decode(struct rpc_task *task);
65 static void call_bind(struct rpc_task *task);
66 static void call_bind_status(struct rpc_task *task);
67 static void call_transmit(struct rpc_task *task);
68 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
69 static void call_bc_transmit(struct rpc_task *task);
70 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
71 static void call_status(struct rpc_task *task);
72 static void call_transmit_status(struct rpc_task *task);
73 static void call_refresh(struct rpc_task *task);
74 static void call_refreshresult(struct rpc_task *task);
75 static void call_timeout(struct rpc_task *task);
76 static void call_connect(struct rpc_task *task);
77 static void call_connect_status(struct rpc_task *task);
78
79 static __be32 *rpc_encode_header(struct rpc_task *task);
80 static __be32 *rpc_verify_header(struct rpc_task *task);
81 static int rpc_ping(struct rpc_clnt *clnt);
82
83 static void rpc_register_client(struct rpc_clnt *clnt)
84 {
85 struct net *net = rpc_net_ns(clnt);
86 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
87
88 spin_lock(&sn->rpc_client_lock);
89 list_add(&clnt->cl_clients, &sn->all_clients);
90 spin_unlock(&sn->rpc_client_lock);
91 }
92
93 static void rpc_unregister_client(struct rpc_clnt *clnt)
94 {
95 struct net *net = rpc_net_ns(clnt);
96 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
97
98 spin_lock(&sn->rpc_client_lock);
99 list_del(&clnt->cl_clients);
100 spin_unlock(&sn->rpc_client_lock);
101 }
102
103 static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
104 {
105 if (clnt->cl_dentry) {
106 if (clnt->cl_auth && clnt->cl_auth->au_ops->pipes_destroy)
107 clnt->cl_auth->au_ops->pipes_destroy(clnt->cl_auth);
108 rpc_remove_client_dir(clnt->cl_dentry);
109 }
110 clnt->cl_dentry = NULL;
111 }
112
113 static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
114 {
115 struct net *net = rpc_net_ns(clnt);
116 struct super_block *pipefs_sb;
117
118 pipefs_sb = rpc_get_sb_net(net);
119 if (pipefs_sb) {
120 __rpc_clnt_remove_pipedir(clnt);
121 rpc_put_sb_net(net);
122 }
123 }
124
125 static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
126 struct rpc_clnt *clnt,
127 const char *dir_name)
128 {
129 static uint32_t clntid;
130 char name[15];
131 struct qstr q = { .name = name };
132 struct dentry *dir, *dentry;
133 int error;
134
135 dir = rpc_d_lookup_sb(sb, dir_name);
136 if (dir == NULL) {
137 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
138 return dir;
139 }
140 for (;;) {
141 q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
142 name[sizeof(name) - 1] = '\0';
143 q.hash = full_name_hash(q.name, q.len);
144 dentry = rpc_create_client_dir(dir, &q, clnt);
145 if (!IS_ERR(dentry))
146 break;
147 error = PTR_ERR(dentry);
148 if (error != -EEXIST) {
149 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
150 " %s/%s, error %d\n",
151 dir_name, name, error);
152 break;
153 }
154 }
155 dput(dir);
156 return dentry;
157 }
158
159 static int
160 rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name)
161 {
162 struct net *net = rpc_net_ns(clnt);
163 struct super_block *pipefs_sb;
164 struct dentry *dentry;
165
166 clnt->cl_dentry = NULL;
167 if (dir_name == NULL)
168 return 0;
169 pipefs_sb = rpc_get_sb_net(net);
170 if (!pipefs_sb)
171 return 0;
172 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt, dir_name);
173 rpc_put_sb_net(net);
174 if (IS_ERR(dentry))
175 return PTR_ERR(dentry);
176 clnt->cl_dentry = dentry;
177 return 0;
178 }
179
180 static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
181 {
182 if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
183 ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
184 return 1;
185 return 0;
186 }
187
188 static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
189 struct super_block *sb)
190 {
191 struct dentry *dentry;
192 int err = 0;
193
194 switch (event) {
195 case RPC_PIPEFS_MOUNT:
196 dentry = rpc_setup_pipedir_sb(sb, clnt,
197 clnt->cl_program->pipe_dir_name);
198 if (!dentry)
199 return -ENOENT;
200 if (IS_ERR(dentry))
201 return PTR_ERR(dentry);
202 clnt->cl_dentry = dentry;
203 if (clnt->cl_auth->au_ops->pipes_create) {
204 err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth);
205 if (err)
206 __rpc_clnt_remove_pipedir(clnt);
207 }
208 break;
209 case RPC_PIPEFS_UMOUNT:
210 __rpc_clnt_remove_pipedir(clnt);
211 break;
212 default:
213 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
214 return -ENOTSUPP;
215 }
216 return err;
217 }
218
219 static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
220 struct super_block *sb)
221 {
222 int error = 0;
223
224 for (;; clnt = clnt->cl_parent) {
225 if (!rpc_clnt_skip_event(clnt, event))
226 error = __rpc_clnt_handle_event(clnt, event, sb);
227 if (error || clnt == clnt->cl_parent)
228 break;
229 }
230 return error;
231 }
232
233 static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
234 {
235 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
236 struct rpc_clnt *clnt;
237
238 spin_lock(&sn->rpc_client_lock);
239 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
240 if (clnt->cl_program->pipe_dir_name == NULL)
241 continue;
242 if (rpc_clnt_skip_event(clnt, event))
243 continue;
244 if (atomic_inc_not_zero(&clnt->cl_count) == 0)
245 continue;
246 spin_unlock(&sn->rpc_client_lock);
247 return clnt;
248 }
249 spin_unlock(&sn->rpc_client_lock);
250 return NULL;
251 }
252
253 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
254 void *ptr)
255 {
256 struct super_block *sb = ptr;
257 struct rpc_clnt *clnt;
258 int error = 0;
259
260 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
261 error = __rpc_pipefs_event(clnt, event, sb);
262 rpc_release_client(clnt);
263 if (error)
264 break;
265 }
266 return error;
267 }
268
269 static struct notifier_block rpc_clients_block = {
270 .notifier_call = rpc_pipefs_event,
271 .priority = SUNRPC_PIPEFS_RPC_PRIO,
272 };
273
274 int rpc_clients_notifier_register(void)
275 {
276 return rpc_pipefs_notifier_register(&rpc_clients_block);
277 }
278
279 void rpc_clients_notifier_unregister(void)
280 {
281 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
282 }
283
284 static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
285 {
286 clnt->cl_nodelen = strlen(nodename);
287 if (clnt->cl_nodelen > UNX_MAXNODENAME)
288 clnt->cl_nodelen = UNX_MAXNODENAME;
289 memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen);
290 }
291
292 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
293 {
294 const struct rpc_program *program = args->program;
295 const struct rpc_version *version;
296 struct rpc_clnt *clnt = NULL;
297 struct rpc_auth *auth;
298 int err;
299
300 /* sanity check the name before trying to print it */
301 dprintk("RPC: creating %s client for %s (xprt %p)\n",
302 program->name, args->servername, xprt);
303
304 err = rpciod_up();
305 if (err)
306 goto out_no_rpciod;
307
308 err = -EINVAL;
309 if (args->version >= program->nrvers)
310 goto out_err;
311 version = program->version[args->version];
312 if (version == NULL)
313 goto out_err;
314
315 err = -ENOMEM;
316 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
317 if (!clnt)
318 goto out_err;
319 clnt->cl_parent = clnt;
320
321 rcu_assign_pointer(clnt->cl_xprt, xprt);
322 clnt->cl_procinfo = version->procs;
323 clnt->cl_maxproc = version->nrprocs;
324 clnt->cl_protname = program->name;
325 clnt->cl_prog = args->prognumber ? : program->number;
326 clnt->cl_vers = version->number;
327 clnt->cl_stats = program->stats;
328 clnt->cl_metrics = rpc_alloc_iostats(clnt);
329 err = -ENOMEM;
330 if (clnt->cl_metrics == NULL)
331 goto out_no_stats;
332 clnt->cl_program = program;
333 INIT_LIST_HEAD(&clnt->cl_tasks);
334 spin_lock_init(&clnt->cl_lock);
335
336 if (!xprt_bound(xprt))
337 clnt->cl_autobind = 1;
338
339 clnt->cl_timeout = xprt->timeout;
340 if (args->timeout != NULL) {
341 memcpy(&clnt->cl_timeout_default, args->timeout,
342 sizeof(clnt->cl_timeout_default));
343 clnt->cl_timeout = &clnt->cl_timeout_default;
344 }
345
346 clnt->cl_rtt = &clnt->cl_rtt_default;
347 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
348 clnt->cl_principal = NULL;
349 if (args->client_name) {
350 clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
351 if (!clnt->cl_principal)
352 goto out_no_principal;
353 }
354
355 atomic_set(&clnt->cl_count, 1);
356
357 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
358 if (err < 0)
359 goto out_no_path;
360
361 auth = rpcauth_create(args->authflavor, clnt);
362 if (IS_ERR(auth)) {
363 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
364 args->authflavor);
365 err = PTR_ERR(auth);
366 goto out_no_auth;
367 }
368
369 /* save the nodename */
370 rpc_clnt_set_nodename(clnt, utsname()->nodename);
371 rpc_register_client(clnt);
372 return clnt;
373
374 out_no_auth:
375 rpc_clnt_remove_pipedir(clnt);
376 out_no_path:
377 kfree(clnt->cl_principal);
378 out_no_principal:
379 rpc_free_iostats(clnt->cl_metrics);
380 out_no_stats:
381 kfree(clnt);
382 out_err:
383 rpciod_down();
384 out_no_rpciod:
385 xprt_put(xprt);
386 return ERR_PTR(err);
387 }
388
389 /**
390 * rpc_create - create an RPC client and transport with one call
391 * @args: rpc_clnt create argument structure
392 *
393 * Creates and initializes an RPC transport and an RPC client.
394 *
395 * It can ping the server in order to determine if it is up, and to see if
396 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
397 * this behavior so asynchronous tasks can also use rpc_create.
398 */
399 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
400 {
401 struct rpc_xprt *xprt;
402 struct rpc_clnt *clnt;
403 struct xprt_create xprtargs = {
404 .net = args->net,
405 .ident = args->protocol,
406 .srcaddr = args->saddress,
407 .dstaddr = args->address,
408 .addrlen = args->addrsize,
409 .servername = args->servername,
410 .bc_xprt = args->bc_xprt,
411 };
412 char servername[48];
413
414 /*
415 * If the caller chooses not to specify a hostname, whip
416 * up a string representation of the passed-in address.
417 */
418 if (xprtargs.servername == NULL) {
419 struct sockaddr_un *sun =
420 (struct sockaddr_un *)args->address;
421 struct sockaddr_in *sin =
422 (struct sockaddr_in *)args->address;
423 struct sockaddr_in6 *sin6 =
424 (struct sockaddr_in6 *)args->address;
425
426 servername[0] = '\0';
427 switch (args->address->sa_family) {
428 case AF_LOCAL:
429 snprintf(servername, sizeof(servername), "%s",
430 sun->sun_path);
431 break;
432 case AF_INET:
433 snprintf(servername, sizeof(servername), "%pI4",
434 &sin->sin_addr.s_addr);
435 break;
436 case AF_INET6:
437 snprintf(servername, sizeof(servername), "%pI6",
438 &sin6->sin6_addr);
439 break;
440 default:
441 /* caller wants default server name, but
442 * address family isn't recognized. */
443 return ERR_PTR(-EINVAL);
444 }
445 xprtargs.servername = servername;
446 }
447
448 xprt = xprt_create_transport(&xprtargs);
449 if (IS_ERR(xprt))
450 return (struct rpc_clnt *)xprt;
451
452 /*
453 * By default, kernel RPC client connects from a reserved port.
454 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
455 * but it is always enabled for rpciod, which handles the connect
456 * operation.
457 */
458 xprt->resvport = 1;
459 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
460 xprt->resvport = 0;
461
462 clnt = rpc_new_client(args, xprt);
463 if (IS_ERR(clnt))
464 return clnt;
465
466 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
467 int err = rpc_ping(clnt);
468 if (err != 0) {
469 rpc_shutdown_client(clnt);
470 return ERR_PTR(err);
471 }
472 }
473
474 clnt->cl_softrtry = 1;
475 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
476 clnt->cl_softrtry = 0;
477
478 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
479 clnt->cl_autobind = 1;
480 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
481 clnt->cl_discrtry = 1;
482 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
483 clnt->cl_chatty = 1;
484
485 return clnt;
486 }
487 EXPORT_SYMBOL_GPL(rpc_create);
488
489 /*
490 * This function clones the RPC client structure. It allows us to share the
491 * same transport while varying parameters such as the authentication
492 * flavour.
493 */
494 static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
495 struct rpc_clnt *clnt)
496 {
497 struct rpc_xprt *xprt;
498 struct rpc_clnt *new;
499 int err;
500
501 err = -ENOMEM;
502 rcu_read_lock();
503 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
504 rcu_read_unlock();
505 if (xprt == NULL)
506 goto out_err;
507 args->servername = xprt->servername;
508
509 new = rpc_new_client(args, xprt);
510 if (IS_ERR(new)) {
511 err = PTR_ERR(new);
512 goto out_err;
513 }
514
515 atomic_inc(&clnt->cl_count);
516 new->cl_parent = clnt;
517
518 /* Turn off autobind on clones */
519 new->cl_autobind = 0;
520 new->cl_softrtry = clnt->cl_softrtry;
521 new->cl_discrtry = clnt->cl_discrtry;
522 new->cl_chatty = clnt->cl_chatty;
523 return new;
524
525 out_err:
526 dprintk("RPC: %s: returned error %d\n", __func__, err);
527 return ERR_PTR(err);
528 }
529
530 /**
531 * rpc_clone_client - Clone an RPC client structure
532 *
533 * @clnt: RPC client whose parameters are copied
534 *
535 * Returns a fresh RPC client or an ERR_PTR.
536 */
537 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
538 {
539 struct rpc_create_args args = {
540 .program = clnt->cl_program,
541 .prognumber = clnt->cl_prog,
542 .version = clnt->cl_vers,
543 .authflavor = clnt->cl_auth->au_flavor,
544 .client_name = clnt->cl_principal,
545 };
546 return __rpc_clone_client(&args, clnt);
547 }
548 EXPORT_SYMBOL_GPL(rpc_clone_client);
549
550 /**
551 * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth
552 *
553 * @clnt: RPC client whose parameters are copied
554 * @flavor: security flavor for new client
555 *
556 * Returns a fresh RPC client or an ERR_PTR.
557 */
558 struct rpc_clnt *
559 rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
560 {
561 struct rpc_create_args args = {
562 .program = clnt->cl_program,
563 .prognumber = clnt->cl_prog,
564 .version = clnt->cl_vers,
565 .authflavor = flavor,
566 .client_name = clnt->cl_principal,
567 };
568 return __rpc_clone_client(&args, clnt);
569 }
570 EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
571
572 /*
573 * Kill all tasks for the given client.
574 * XXX: kill their descendants as well?
575 */
576 void rpc_killall_tasks(struct rpc_clnt *clnt)
577 {
578 struct rpc_task *rovr;
579
580
581 if (list_empty(&clnt->cl_tasks))
582 return;
583 dprintk("RPC: killing all tasks for client %p\n", clnt);
584 /*
585 * Spin lock all_tasks to prevent changes...
586 */
587 spin_lock(&clnt->cl_lock);
588 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
589 if (!RPC_IS_ACTIVATED(rovr))
590 continue;
591 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
592 rovr->tk_flags |= RPC_TASK_KILLED;
593 rpc_exit(rovr, -EIO);
594 if (RPC_IS_QUEUED(rovr))
595 rpc_wake_up_queued_task(rovr->tk_waitqueue,
596 rovr);
597 }
598 }
599 spin_unlock(&clnt->cl_lock);
600 }
601 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
602
603 /*
604 * Properly shut down an RPC client, terminating all outstanding
605 * requests.
606 */
607 void rpc_shutdown_client(struct rpc_clnt *clnt)
608 {
609 might_sleep();
610
611 dprintk_rcu("RPC: shutting down %s client for %s\n",
612 clnt->cl_protname,
613 rcu_dereference(clnt->cl_xprt)->servername);
614
615 while (!list_empty(&clnt->cl_tasks)) {
616 rpc_killall_tasks(clnt);
617 wait_event_timeout(destroy_wait,
618 list_empty(&clnt->cl_tasks), 1*HZ);
619 }
620
621 rpc_release_client(clnt);
622 }
623 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
624
625 /*
626 * Free an RPC client
627 */
628 static void
629 rpc_free_client(struct rpc_clnt *clnt)
630 {
631 dprintk_rcu("RPC: destroying %s client for %s\n",
632 clnt->cl_protname,
633 rcu_dereference(clnt->cl_xprt)->servername);
634 if (clnt->cl_parent != clnt)
635 rpc_release_client(clnt->cl_parent);
636 rpc_unregister_client(clnt);
637 rpc_clnt_remove_pipedir(clnt);
638 rpc_free_iostats(clnt->cl_metrics);
639 kfree(clnt->cl_principal);
640 clnt->cl_metrics = NULL;
641 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
642 rpciod_down();
643 kfree(clnt);
644 }
645
646 /*
647 * Free an RPC client
648 */
649 static void
650 rpc_free_auth(struct rpc_clnt *clnt)
651 {
652 if (clnt->cl_auth == NULL) {
653 rpc_free_client(clnt);
654 return;
655 }
656
657 /*
658 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
659 * release remaining GSS contexts. This mechanism ensures
660 * that it can do so safely.
661 */
662 atomic_inc(&clnt->cl_count);
663 rpcauth_release(clnt->cl_auth);
664 clnt->cl_auth = NULL;
665 if (atomic_dec_and_test(&clnt->cl_count))
666 rpc_free_client(clnt);
667 }
668
669 /*
670 * Release reference to the RPC client
671 */
672 void
673 rpc_release_client(struct rpc_clnt *clnt)
674 {
675 dprintk("RPC: rpc_release_client(%p)\n", clnt);
676
677 if (list_empty(&clnt->cl_tasks))
678 wake_up(&destroy_wait);
679 if (atomic_dec_and_test(&clnt->cl_count))
680 rpc_free_auth(clnt);
681 }
682
683 /**
684 * rpc_bind_new_program - bind a new RPC program to an existing client
685 * @old: old rpc_client
686 * @program: rpc program to set
687 * @vers: rpc program version
688 *
689 * Clones the rpc client and sets up a new RPC program. This is mainly
690 * of use for enabling different RPC programs to share the same transport.
691 * The Sun NFSv2/v3 ACL protocol can do this.
692 */
693 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
694 const struct rpc_program *program,
695 u32 vers)
696 {
697 struct rpc_create_args args = {
698 .program = program,
699 .prognumber = program->number,
700 .version = vers,
701 .authflavor = old->cl_auth->au_flavor,
702 .client_name = old->cl_principal,
703 };
704 struct rpc_clnt *clnt;
705 int err;
706
707 clnt = __rpc_clone_client(&args, old);
708 if (IS_ERR(clnt))
709 goto out;
710 err = rpc_ping(clnt);
711 if (err != 0) {
712 rpc_shutdown_client(clnt);
713 clnt = ERR_PTR(err);
714 }
715 out:
716 return clnt;
717 }
718 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
719
720 void rpc_task_release_client(struct rpc_task *task)
721 {
722 struct rpc_clnt *clnt = task->tk_client;
723
724 if (clnt != NULL) {
725 /* Remove from client task list */
726 spin_lock(&clnt->cl_lock);
727 list_del(&task->tk_task);
728 spin_unlock(&clnt->cl_lock);
729 task->tk_client = NULL;
730
731 rpc_release_client(clnt);
732 }
733 }
734
735 static
736 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
737 {
738 if (clnt != NULL) {
739 rpc_task_release_client(task);
740 task->tk_client = clnt;
741 atomic_inc(&clnt->cl_count);
742 if (clnt->cl_softrtry)
743 task->tk_flags |= RPC_TASK_SOFT;
744 if (sk_memalloc_socks()) {
745 struct rpc_xprt *xprt;
746
747 rcu_read_lock();
748 xprt = rcu_dereference(clnt->cl_xprt);
749 if (xprt->swapper)
750 task->tk_flags |= RPC_TASK_SWAPPER;
751 rcu_read_unlock();
752 }
753 /* Add to the client's list of all tasks */
754 spin_lock(&clnt->cl_lock);
755 list_add_tail(&task->tk_task, &clnt->cl_tasks);
756 spin_unlock(&clnt->cl_lock);
757 }
758 }
759
760 void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
761 {
762 rpc_task_release_client(task);
763 rpc_task_set_client(task, clnt);
764 }
765 EXPORT_SYMBOL_GPL(rpc_task_reset_client);
766
767
768 static void
769 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
770 {
771 if (msg != NULL) {
772 task->tk_msg.rpc_proc = msg->rpc_proc;
773 task->tk_msg.rpc_argp = msg->rpc_argp;
774 task->tk_msg.rpc_resp = msg->rpc_resp;
775 if (msg->rpc_cred != NULL)
776 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
777 }
778 }
779
780 /*
781 * Default callback for async RPC calls
782 */
783 static void
784 rpc_default_callback(struct rpc_task *task, void *data)
785 {
786 }
787
788 static const struct rpc_call_ops rpc_default_ops = {
789 .rpc_call_done = rpc_default_callback,
790 };
791
792 /**
793 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
794 * @task_setup_data: pointer to task initialisation data
795 */
796 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
797 {
798 struct rpc_task *task;
799
800 task = rpc_new_task(task_setup_data);
801 if (IS_ERR(task))
802 goto out;
803
804 rpc_task_set_client(task, task_setup_data->rpc_client);
805 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
806
807 if (task->tk_action == NULL)
808 rpc_call_start(task);
809
810 atomic_inc(&task->tk_count);
811 rpc_execute(task);
812 out:
813 return task;
814 }
815 EXPORT_SYMBOL_GPL(rpc_run_task);
816
817 /**
818 * rpc_call_sync - Perform a synchronous RPC call
819 * @clnt: pointer to RPC client
820 * @msg: RPC call parameters
821 * @flags: RPC call flags
822 */
823 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
824 {
825 struct rpc_task *task;
826 struct rpc_task_setup task_setup_data = {
827 .rpc_client = clnt,
828 .rpc_message = msg,
829 .callback_ops = &rpc_default_ops,
830 .flags = flags,
831 };
832 int status;
833
834 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
835 if (flags & RPC_TASK_ASYNC) {
836 rpc_release_calldata(task_setup_data.callback_ops,
837 task_setup_data.callback_data);
838 return -EINVAL;
839 }
840
841 task = rpc_run_task(&task_setup_data);
842 if (IS_ERR(task))
843 return PTR_ERR(task);
844 status = task->tk_status;
845 rpc_put_task(task);
846 return status;
847 }
848 EXPORT_SYMBOL_GPL(rpc_call_sync);
849
850 /**
851 * rpc_call_async - Perform an asynchronous RPC call
852 * @clnt: pointer to RPC client
853 * @msg: RPC call parameters
854 * @flags: RPC call flags
855 * @tk_ops: RPC call ops
856 * @data: user call data
857 */
858 int
859 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
860 const struct rpc_call_ops *tk_ops, void *data)
861 {
862 struct rpc_task *task;
863 struct rpc_task_setup task_setup_data = {
864 .rpc_client = clnt,
865 .rpc_message = msg,
866 .callback_ops = tk_ops,
867 .callback_data = data,
868 .flags = flags|RPC_TASK_ASYNC,
869 };
870
871 task = rpc_run_task(&task_setup_data);
872 if (IS_ERR(task))
873 return PTR_ERR(task);
874 rpc_put_task(task);
875 return 0;
876 }
877 EXPORT_SYMBOL_GPL(rpc_call_async);
878
879 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
880 /**
881 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
882 * rpc_execute against it
883 * @req: RPC request
884 * @tk_ops: RPC call ops
885 */
886 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
887 const struct rpc_call_ops *tk_ops)
888 {
889 struct rpc_task *task;
890 struct xdr_buf *xbufp = &req->rq_snd_buf;
891 struct rpc_task_setup task_setup_data = {
892 .callback_ops = tk_ops,
893 };
894
895 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
896 /*
897 * Create an rpc_task to send the data
898 */
899 task = rpc_new_task(&task_setup_data);
900 if (IS_ERR(task)) {
901 xprt_free_bc_request(req);
902 goto out;
903 }
904 task->tk_rqstp = req;
905
906 /*
907 * Set up the xdr_buf length.
908 * This also indicates that the buffer is XDR encoded already.
909 */
910 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
911 xbufp->tail[0].iov_len;
912
913 task->tk_action = call_bc_transmit;
914 atomic_inc(&task->tk_count);
915 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
916 rpc_execute(task);
917
918 out:
919 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
920 return task;
921 }
922 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
923
924 void
925 rpc_call_start(struct rpc_task *task)
926 {
927 task->tk_action = call_start;
928 }
929 EXPORT_SYMBOL_GPL(rpc_call_start);
930
931 /**
932 * rpc_peeraddr - extract remote peer address from clnt's xprt
933 * @clnt: RPC client structure
934 * @buf: target buffer
935 * @bufsize: length of target buffer
936 *
937 * Returns the number of bytes that are actually in the stored address.
938 */
939 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
940 {
941 size_t bytes;
942 struct rpc_xprt *xprt;
943
944 rcu_read_lock();
945 xprt = rcu_dereference(clnt->cl_xprt);
946
947 bytes = xprt->addrlen;
948 if (bytes > bufsize)
949 bytes = bufsize;
950 memcpy(buf, &xprt->addr, bytes);
951 rcu_read_unlock();
952
953 return bytes;
954 }
955 EXPORT_SYMBOL_GPL(rpc_peeraddr);
956
957 /**
958 * rpc_peeraddr2str - return remote peer address in printable format
959 * @clnt: RPC client structure
960 * @format: address format
961 *
962 * NB: the lifetime of the memory referenced by the returned pointer is
963 * the same as the rpc_xprt itself. As long as the caller uses this
964 * pointer, it must hold the RCU read lock.
965 */
966 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
967 enum rpc_display_format_t format)
968 {
969 struct rpc_xprt *xprt;
970
971 xprt = rcu_dereference(clnt->cl_xprt);
972
973 if (xprt->address_strings[format] != NULL)
974 return xprt->address_strings[format];
975 else
976 return "unprintable";
977 }
978 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
979
980 static const struct sockaddr_in rpc_inaddr_loopback = {
981 .sin_family = AF_INET,
982 .sin_addr.s_addr = htonl(INADDR_ANY),
983 };
984
985 static const struct sockaddr_in6 rpc_in6addr_loopback = {
986 .sin6_family = AF_INET6,
987 .sin6_addr = IN6ADDR_ANY_INIT,
988 };
989
990 /*
991 * Try a getsockname() on a connected datagram socket. Using a
992 * connected datagram socket prevents leaving a socket in TIME_WAIT.
993 * This conserves the ephemeral port number space.
994 *
995 * Returns zero and fills in "buf" if successful; otherwise, a
996 * negative errno is returned.
997 */
998 static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
999 struct sockaddr *buf, int buflen)
1000 {
1001 struct socket *sock;
1002 int err;
1003
1004 err = __sock_create(net, sap->sa_family,
1005 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1006 if (err < 0) {
1007 dprintk("RPC: can't create UDP socket (%d)\n", err);
1008 goto out;
1009 }
1010
1011 switch (sap->sa_family) {
1012 case AF_INET:
1013 err = kernel_bind(sock,
1014 (struct sockaddr *)&rpc_inaddr_loopback,
1015 sizeof(rpc_inaddr_loopback));
1016 break;
1017 case AF_INET6:
1018 err = kernel_bind(sock,
1019 (struct sockaddr *)&rpc_in6addr_loopback,
1020 sizeof(rpc_in6addr_loopback));
1021 break;
1022 default:
1023 err = -EAFNOSUPPORT;
1024 goto out;
1025 }
1026 if (err < 0) {
1027 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1028 goto out_release;
1029 }
1030
1031 err = kernel_connect(sock, sap, salen, 0);
1032 if (err < 0) {
1033 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1034 goto out_release;
1035 }
1036
1037 err = kernel_getsockname(sock, buf, &buflen);
1038 if (err < 0) {
1039 dprintk("RPC: getsockname failed (%d)\n", err);
1040 goto out_release;
1041 }
1042
1043 err = 0;
1044 if (buf->sa_family == AF_INET6) {
1045 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1046 sin6->sin6_scope_id = 0;
1047 }
1048 dprintk("RPC: %s succeeded\n", __func__);
1049
1050 out_release:
1051 sock_release(sock);
1052 out:
1053 return err;
1054 }
1055
1056 /*
1057 * Scraping a connected socket failed, so we don't have a useable
1058 * local address. Fallback: generate an address that will prevent
1059 * the server from calling us back.
1060 *
1061 * Returns zero and fills in "buf" if successful; otherwise, a
1062 * negative errno is returned.
1063 */
1064 static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1065 {
1066 switch (family) {
1067 case AF_INET:
1068 if (buflen < sizeof(rpc_inaddr_loopback))
1069 return -EINVAL;
1070 memcpy(buf, &rpc_inaddr_loopback,
1071 sizeof(rpc_inaddr_loopback));
1072 break;
1073 case AF_INET6:
1074 if (buflen < sizeof(rpc_in6addr_loopback))
1075 return -EINVAL;
1076 memcpy(buf, &rpc_in6addr_loopback,
1077 sizeof(rpc_in6addr_loopback));
1078 default:
1079 dprintk("RPC: %s: address family not supported\n",
1080 __func__);
1081 return -EAFNOSUPPORT;
1082 }
1083 dprintk("RPC: %s: succeeded\n", __func__);
1084 return 0;
1085 }
1086
1087 /**
1088 * rpc_localaddr - discover local endpoint address for an RPC client
1089 * @clnt: RPC client structure
1090 * @buf: target buffer
1091 * @buflen: size of target buffer, in bytes
1092 *
1093 * Returns zero and fills in "buf" and "buflen" if successful;
1094 * otherwise, a negative errno is returned.
1095 *
1096 * This works even if the underlying transport is not currently connected,
1097 * or if the upper layer never previously provided a source address.
1098 *
1099 * The result of this function call is transient: multiple calls in
1100 * succession may give different results, depending on how local
1101 * networking configuration changes over time.
1102 */
1103 int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1104 {
1105 struct sockaddr_storage address;
1106 struct sockaddr *sap = (struct sockaddr *)&address;
1107 struct rpc_xprt *xprt;
1108 struct net *net;
1109 size_t salen;
1110 int err;
1111
1112 rcu_read_lock();
1113 xprt = rcu_dereference(clnt->cl_xprt);
1114 salen = xprt->addrlen;
1115 memcpy(sap, &xprt->addr, salen);
1116 net = get_net(xprt->xprt_net);
1117 rcu_read_unlock();
1118
1119 rpc_set_port(sap, 0);
1120 err = rpc_sockname(net, sap, salen, buf, buflen);
1121 put_net(net);
1122 if (err != 0)
1123 /* Couldn't discover local address, return ANYADDR */
1124 return rpc_anyaddr(sap->sa_family, buf, buflen);
1125 return 0;
1126 }
1127 EXPORT_SYMBOL_GPL(rpc_localaddr);
1128
1129 void
1130 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1131 {
1132 struct rpc_xprt *xprt;
1133
1134 rcu_read_lock();
1135 xprt = rcu_dereference(clnt->cl_xprt);
1136 if (xprt->ops->set_buffer_size)
1137 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1138 rcu_read_unlock();
1139 }
1140 EXPORT_SYMBOL_GPL(rpc_setbufsize);
1141
1142 /**
1143 * rpc_protocol - Get transport protocol number for an RPC client
1144 * @clnt: RPC client to query
1145 *
1146 */
1147 int rpc_protocol(struct rpc_clnt *clnt)
1148 {
1149 int protocol;
1150
1151 rcu_read_lock();
1152 protocol = rcu_dereference(clnt->cl_xprt)->prot;
1153 rcu_read_unlock();
1154 return protocol;
1155 }
1156 EXPORT_SYMBOL_GPL(rpc_protocol);
1157
1158 /**
1159 * rpc_net_ns - Get the network namespace for this RPC client
1160 * @clnt: RPC client to query
1161 *
1162 */
1163 struct net *rpc_net_ns(struct rpc_clnt *clnt)
1164 {
1165 struct net *ret;
1166
1167 rcu_read_lock();
1168 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1169 rcu_read_unlock();
1170 return ret;
1171 }
1172 EXPORT_SYMBOL_GPL(rpc_net_ns);
1173
1174 /**
1175 * rpc_max_payload - Get maximum payload size for a transport, in bytes
1176 * @clnt: RPC client to query
1177 *
1178 * For stream transports, this is one RPC record fragment (see RFC
1179 * 1831), as we don't support multi-record requests yet. For datagram
1180 * transports, this is the size of an IP packet minus the IP, UDP, and
1181 * RPC header sizes.
1182 */
1183 size_t rpc_max_payload(struct rpc_clnt *clnt)
1184 {
1185 size_t ret;
1186
1187 rcu_read_lock();
1188 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1189 rcu_read_unlock();
1190 return ret;
1191 }
1192 EXPORT_SYMBOL_GPL(rpc_max_payload);
1193
1194 /**
1195 * rpc_get_timeout - Get timeout for transport in units of HZ
1196 * @clnt: RPC client to query
1197 */
1198 unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
1199 {
1200 unsigned long ret;
1201
1202 rcu_read_lock();
1203 ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval;
1204 rcu_read_unlock();
1205 return ret;
1206 }
1207 EXPORT_SYMBOL_GPL(rpc_get_timeout);
1208
1209 /**
1210 * rpc_force_rebind - force transport to check that remote port is unchanged
1211 * @clnt: client to rebind
1212 *
1213 */
1214 void rpc_force_rebind(struct rpc_clnt *clnt)
1215 {
1216 if (clnt->cl_autobind) {
1217 rcu_read_lock();
1218 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1219 rcu_read_unlock();
1220 }
1221 }
1222 EXPORT_SYMBOL_GPL(rpc_force_rebind);
1223
1224 /*
1225 * Restart an (async) RPC call from the call_prepare state.
1226 * Usually called from within the exit handler.
1227 */
1228 int
1229 rpc_restart_call_prepare(struct rpc_task *task)
1230 {
1231 if (RPC_ASSASSINATED(task))
1232 return 0;
1233 task->tk_action = call_start;
1234 if (task->tk_ops->rpc_call_prepare != NULL)
1235 task->tk_action = rpc_prepare_task;
1236 return 1;
1237 }
1238 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1239
1240 /*
1241 * Restart an (async) RPC call. Usually called from within the
1242 * exit handler.
1243 */
1244 int
1245 rpc_restart_call(struct rpc_task *task)
1246 {
1247 if (RPC_ASSASSINATED(task))
1248 return 0;
1249 task->tk_action = call_start;
1250 return 1;
1251 }
1252 EXPORT_SYMBOL_GPL(rpc_restart_call);
1253
1254 #ifdef RPC_DEBUG
1255 static const char *rpc_proc_name(const struct rpc_task *task)
1256 {
1257 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1258
1259 if (proc) {
1260 if (proc->p_name)
1261 return proc->p_name;
1262 else
1263 return "NULL";
1264 } else
1265 return "no proc";
1266 }
1267 #endif
1268
1269 /*
1270 * 0. Initial state
1271 *
1272 * Other FSM states can be visited zero or more times, but
1273 * this state is visited exactly once for each RPC.
1274 */
1275 static void
1276 call_start(struct rpc_task *task)
1277 {
1278 struct rpc_clnt *clnt = task->tk_client;
1279
1280 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1281 clnt->cl_protname, clnt->cl_vers,
1282 rpc_proc_name(task),
1283 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1284
1285 /* Increment call count */
1286 task->tk_msg.rpc_proc->p_count++;
1287 clnt->cl_stats->rpccnt++;
1288 task->tk_action = call_reserve;
1289 }
1290
1291 /*
1292 * 1. Reserve an RPC call slot
1293 */
1294 static void
1295 call_reserve(struct rpc_task *task)
1296 {
1297 dprint_status(task);
1298
1299 task->tk_status = 0;
1300 task->tk_action = call_reserveresult;
1301 xprt_reserve(task);
1302 }
1303
1304 /*
1305 * 1b. Grok the result of xprt_reserve()
1306 */
1307 static void
1308 call_reserveresult(struct rpc_task *task)
1309 {
1310 int status = task->tk_status;
1311
1312 dprint_status(task);
1313
1314 /*
1315 * After a call to xprt_reserve(), we must have either
1316 * a request slot or else an error status.
1317 */
1318 task->tk_status = 0;
1319 if (status >= 0) {
1320 if (task->tk_rqstp) {
1321 task->tk_action = call_refresh;
1322 return;
1323 }
1324
1325 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1326 __func__, status);
1327 rpc_exit(task, -EIO);
1328 return;
1329 }
1330
1331 /*
1332 * Even though there was an error, we may have acquired
1333 * a request slot somehow. Make sure not to leak it.
1334 */
1335 if (task->tk_rqstp) {
1336 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1337 __func__, status);
1338 xprt_release(task);
1339 }
1340
1341 switch (status) {
1342 case -ENOMEM:
1343 rpc_delay(task, HZ >> 2);
1344 case -EAGAIN: /* woken up; retry */
1345 task->tk_action = call_reserve;
1346 return;
1347 case -EIO: /* probably a shutdown */
1348 break;
1349 default:
1350 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1351 __func__, status);
1352 break;
1353 }
1354 rpc_exit(task, status);
1355 }
1356
1357 /*
1358 * 2. Bind and/or refresh the credentials
1359 */
1360 static void
1361 call_refresh(struct rpc_task *task)
1362 {
1363 dprint_status(task);
1364
1365 task->tk_action = call_refreshresult;
1366 task->tk_status = 0;
1367 task->tk_client->cl_stats->rpcauthrefresh++;
1368 rpcauth_refreshcred(task);
1369 }
1370
1371 /*
1372 * 2a. Process the results of a credential refresh
1373 */
1374 static void
1375 call_refreshresult(struct rpc_task *task)
1376 {
1377 int status = task->tk_status;
1378
1379 dprint_status(task);
1380
1381 task->tk_status = 0;
1382 task->tk_action = call_refresh;
1383 switch (status) {
1384 case 0:
1385 if (rpcauth_uptodatecred(task))
1386 task->tk_action = call_allocate;
1387 return;
1388 case -ETIMEDOUT:
1389 rpc_delay(task, 3*HZ);
1390 case -EKEYEXPIRED:
1391 case -EAGAIN:
1392 status = -EACCES;
1393 if (!task->tk_cred_retry)
1394 break;
1395 task->tk_cred_retry--;
1396 dprintk("RPC: %5u %s: retry refresh creds\n",
1397 task->tk_pid, __func__);
1398 return;
1399 }
1400 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1401 task->tk_pid, __func__, status);
1402 rpc_exit(task, status);
1403 }
1404
1405 /*
1406 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1407 * (Note: buffer memory is freed in xprt_release).
1408 */
1409 static void
1410 call_allocate(struct rpc_task *task)
1411 {
1412 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1413 struct rpc_rqst *req = task->tk_rqstp;
1414 struct rpc_xprt *xprt = req->rq_xprt;
1415 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1416
1417 dprint_status(task);
1418
1419 task->tk_status = 0;
1420 task->tk_action = call_bind;
1421
1422 if (req->rq_buffer)
1423 return;
1424
1425 if (proc->p_proc != 0) {
1426 BUG_ON(proc->p_arglen == 0);
1427 if (proc->p_decode != NULL)
1428 BUG_ON(proc->p_replen == 0);
1429 }
1430
1431 /*
1432 * Calculate the size (in quads) of the RPC call
1433 * and reply headers, and convert both values
1434 * to byte sizes.
1435 */
1436 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1437 req->rq_callsize <<= 2;
1438 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1439 req->rq_rcvsize <<= 2;
1440
1441 req->rq_buffer = xprt->ops->buf_alloc(task,
1442 req->rq_callsize + req->rq_rcvsize);
1443 if (req->rq_buffer != NULL)
1444 return;
1445
1446 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1447
1448 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1449 task->tk_action = call_allocate;
1450 rpc_delay(task, HZ>>4);
1451 return;
1452 }
1453
1454 rpc_exit(task, -ERESTARTSYS);
1455 }
1456
1457 static inline int
1458 rpc_task_need_encode(struct rpc_task *task)
1459 {
1460 return task->tk_rqstp->rq_snd_buf.len == 0;
1461 }
1462
1463 static inline void
1464 rpc_task_force_reencode(struct rpc_task *task)
1465 {
1466 task->tk_rqstp->rq_snd_buf.len = 0;
1467 task->tk_rqstp->rq_bytes_sent = 0;
1468 }
1469
1470 static inline void
1471 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1472 {
1473 buf->head[0].iov_base = start;
1474 buf->head[0].iov_len = len;
1475 buf->tail[0].iov_len = 0;
1476 buf->page_len = 0;
1477 buf->flags = 0;
1478 buf->len = 0;
1479 buf->buflen = len;
1480 }
1481
1482 /*
1483 * 3. Encode arguments of an RPC call
1484 */
1485 static void
1486 rpc_xdr_encode(struct rpc_task *task)
1487 {
1488 struct rpc_rqst *req = task->tk_rqstp;
1489 kxdreproc_t encode;
1490 __be32 *p;
1491
1492 dprint_status(task);
1493
1494 rpc_xdr_buf_init(&req->rq_snd_buf,
1495 req->rq_buffer,
1496 req->rq_callsize);
1497 rpc_xdr_buf_init(&req->rq_rcv_buf,
1498 (char *)req->rq_buffer + req->rq_callsize,
1499 req->rq_rcvsize);
1500
1501 p = rpc_encode_header(task);
1502 if (p == NULL) {
1503 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1504 rpc_exit(task, -EIO);
1505 return;
1506 }
1507
1508 encode = task->tk_msg.rpc_proc->p_encode;
1509 if (encode == NULL)
1510 return;
1511
1512 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1513 task->tk_msg.rpc_argp);
1514 }
1515
1516 /*
1517 * 4. Get the server port number if not yet set
1518 */
1519 static void
1520 call_bind(struct rpc_task *task)
1521 {
1522 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1523
1524 dprint_status(task);
1525
1526 task->tk_action = call_connect;
1527 if (!xprt_bound(xprt)) {
1528 task->tk_action = call_bind_status;
1529 task->tk_timeout = xprt->bind_timeout;
1530 xprt->ops->rpcbind(task);
1531 }
1532 }
1533
1534 /*
1535 * 4a. Sort out bind result
1536 */
1537 static void
1538 call_bind_status(struct rpc_task *task)
1539 {
1540 int status = -EIO;
1541
1542 if (task->tk_status >= 0) {
1543 dprint_status(task);
1544 task->tk_status = 0;
1545 task->tk_action = call_connect;
1546 return;
1547 }
1548
1549 trace_rpc_bind_status(task);
1550 switch (task->tk_status) {
1551 case -ENOMEM:
1552 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1553 rpc_delay(task, HZ >> 2);
1554 goto retry_timeout;
1555 case -EACCES:
1556 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1557 "unavailable\n", task->tk_pid);
1558 /* fail immediately if this is an RPC ping */
1559 if (task->tk_msg.rpc_proc->p_proc == 0) {
1560 status = -EOPNOTSUPP;
1561 break;
1562 }
1563 if (task->tk_rebind_retry == 0)
1564 break;
1565 task->tk_rebind_retry--;
1566 rpc_delay(task, 3*HZ);
1567 goto retry_timeout;
1568 case -ETIMEDOUT:
1569 dprintk("RPC: %5u rpcbind request timed out\n",
1570 task->tk_pid);
1571 goto retry_timeout;
1572 case -EPFNOSUPPORT:
1573 /* server doesn't support any rpcbind version we know of */
1574 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1575 task->tk_pid);
1576 break;
1577 case -EPROTONOSUPPORT:
1578 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1579 task->tk_pid);
1580 task->tk_status = 0;
1581 task->tk_action = call_bind;
1582 return;
1583 case -ECONNREFUSED: /* connection problems */
1584 case -ECONNRESET:
1585 case -ENOTCONN:
1586 case -EHOSTDOWN:
1587 case -EHOSTUNREACH:
1588 case -ENETUNREACH:
1589 case -EPIPE:
1590 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1591 task->tk_pid, task->tk_status);
1592 if (!RPC_IS_SOFTCONN(task)) {
1593 rpc_delay(task, 5*HZ);
1594 goto retry_timeout;
1595 }
1596 status = task->tk_status;
1597 break;
1598 default:
1599 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1600 task->tk_pid, -task->tk_status);
1601 }
1602
1603 rpc_exit(task, status);
1604 return;
1605
1606 retry_timeout:
1607 task->tk_action = call_timeout;
1608 }
1609
1610 /*
1611 * 4b. Connect to the RPC server
1612 */
1613 static void
1614 call_connect(struct rpc_task *task)
1615 {
1616 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1617
1618 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1619 task->tk_pid, xprt,
1620 (xprt_connected(xprt) ? "is" : "is not"));
1621
1622 task->tk_action = call_transmit;
1623 if (!xprt_connected(xprt)) {
1624 task->tk_action = call_connect_status;
1625 if (task->tk_status < 0)
1626 return;
1627 xprt_connect(task);
1628 }
1629 }
1630
1631 /*
1632 * 4c. Sort out connect result
1633 */
1634 static void
1635 call_connect_status(struct rpc_task *task)
1636 {
1637 struct rpc_clnt *clnt = task->tk_client;
1638 int status = task->tk_status;
1639
1640 dprint_status(task);
1641
1642 task->tk_status = 0;
1643 if (status >= 0 || status == -EAGAIN) {
1644 clnt->cl_stats->netreconn++;
1645 task->tk_action = call_transmit;
1646 return;
1647 }
1648
1649 trace_rpc_connect_status(task, status);
1650 switch (status) {
1651 /* if soft mounted, test if we've timed out */
1652 case -ETIMEDOUT:
1653 task->tk_action = call_timeout;
1654 break;
1655 default:
1656 rpc_exit(task, -EIO);
1657 }
1658 }
1659
1660 /*
1661 * 5. Transmit the RPC request, and wait for reply
1662 */
1663 static void
1664 call_transmit(struct rpc_task *task)
1665 {
1666 dprint_status(task);
1667
1668 task->tk_action = call_status;
1669 if (task->tk_status < 0)
1670 return;
1671 task->tk_status = xprt_prepare_transmit(task);
1672 if (task->tk_status != 0)
1673 return;
1674 task->tk_action = call_transmit_status;
1675 /* Encode here so that rpcsec_gss can use correct sequence number. */
1676 if (rpc_task_need_encode(task)) {
1677 rpc_xdr_encode(task);
1678 /* Did the encode result in an error condition? */
1679 if (task->tk_status != 0) {
1680 /* Was the error nonfatal? */
1681 if (task->tk_status == -EAGAIN)
1682 rpc_delay(task, HZ >> 4);
1683 else
1684 rpc_exit(task, task->tk_status);
1685 return;
1686 }
1687 }
1688 xprt_transmit(task);
1689 if (task->tk_status < 0)
1690 return;
1691 /*
1692 * On success, ensure that we call xprt_end_transmit() before sleeping
1693 * in order to allow access to the socket to other RPC requests.
1694 */
1695 call_transmit_status(task);
1696 if (rpc_reply_expected(task))
1697 return;
1698 task->tk_action = rpc_exit_task;
1699 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1700 }
1701
1702 /*
1703 * 5a. Handle cleanup after a transmission
1704 */
1705 static void
1706 call_transmit_status(struct rpc_task *task)
1707 {
1708 task->tk_action = call_status;
1709
1710 /*
1711 * Common case: success. Force the compiler to put this
1712 * test first.
1713 */
1714 if (task->tk_status == 0) {
1715 xprt_end_transmit(task);
1716 rpc_task_force_reencode(task);
1717 return;
1718 }
1719
1720 switch (task->tk_status) {
1721 case -EAGAIN:
1722 break;
1723 default:
1724 dprint_status(task);
1725 xprt_end_transmit(task);
1726 rpc_task_force_reencode(task);
1727 break;
1728 /*
1729 * Special cases: if we've been waiting on the
1730 * socket's write_space() callback, or if the
1731 * socket just returned a connection error,
1732 * then hold onto the transport lock.
1733 */
1734 case -ECONNREFUSED:
1735 case -EHOSTDOWN:
1736 case -EHOSTUNREACH:
1737 case -ENETUNREACH:
1738 if (RPC_IS_SOFTCONN(task)) {
1739 xprt_end_transmit(task);
1740 rpc_exit(task, task->tk_status);
1741 break;
1742 }
1743 case -ECONNRESET:
1744 case -ENOTCONN:
1745 case -EPIPE:
1746 rpc_task_force_reencode(task);
1747 }
1748 }
1749
1750 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1751 /*
1752 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1753 * addition, disconnect on connectivity errors.
1754 */
1755 static void
1756 call_bc_transmit(struct rpc_task *task)
1757 {
1758 struct rpc_rqst *req = task->tk_rqstp;
1759
1760 task->tk_status = xprt_prepare_transmit(task);
1761 if (task->tk_status == -EAGAIN) {
1762 /*
1763 * Could not reserve the transport. Try again after the
1764 * transport is released.
1765 */
1766 task->tk_status = 0;
1767 task->tk_action = call_bc_transmit;
1768 return;
1769 }
1770
1771 task->tk_action = rpc_exit_task;
1772 if (task->tk_status < 0) {
1773 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1774 "error: %d\n", task->tk_status);
1775 return;
1776 }
1777
1778 xprt_transmit(task);
1779 xprt_end_transmit(task);
1780 dprint_status(task);
1781 switch (task->tk_status) {
1782 case 0:
1783 /* Success */
1784 break;
1785 case -EHOSTDOWN:
1786 case -EHOSTUNREACH:
1787 case -ENETUNREACH:
1788 case -ETIMEDOUT:
1789 /*
1790 * Problem reaching the server. Disconnect and let the
1791 * forechannel reestablish the connection. The server will
1792 * have to retransmit the backchannel request and we'll
1793 * reprocess it. Since these ops are idempotent, there's no
1794 * need to cache our reply at this time.
1795 */
1796 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1797 "error: %d\n", task->tk_status);
1798 xprt_conditional_disconnect(req->rq_xprt,
1799 req->rq_connect_cookie);
1800 break;
1801 default:
1802 /*
1803 * We were unable to reply and will have to drop the
1804 * request. The server should reconnect and retransmit.
1805 */
1806 WARN_ON_ONCE(task->tk_status == -EAGAIN);
1807 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1808 "error: %d\n", task->tk_status);
1809 break;
1810 }
1811 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1812 }
1813 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1814
1815 /*
1816 * 6. Sort out the RPC call status
1817 */
1818 static void
1819 call_status(struct rpc_task *task)
1820 {
1821 struct rpc_clnt *clnt = task->tk_client;
1822 struct rpc_rqst *req = task->tk_rqstp;
1823 int status;
1824
1825 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
1826 task->tk_status = req->rq_reply_bytes_recvd;
1827
1828 dprint_status(task);
1829
1830 status = task->tk_status;
1831 if (status >= 0) {
1832 task->tk_action = call_decode;
1833 return;
1834 }
1835
1836 trace_rpc_call_status(task);
1837 task->tk_status = 0;
1838 switch(status) {
1839 case -EHOSTDOWN:
1840 case -EHOSTUNREACH:
1841 case -ENETUNREACH:
1842 /*
1843 * Delay any retries for 3 seconds, then handle as if it
1844 * were a timeout.
1845 */
1846 rpc_delay(task, 3*HZ);
1847 case -ETIMEDOUT:
1848 task->tk_action = call_timeout;
1849 if (task->tk_client->cl_discrtry)
1850 xprt_conditional_disconnect(req->rq_xprt,
1851 req->rq_connect_cookie);
1852 break;
1853 case -ECONNRESET:
1854 case -ECONNREFUSED:
1855 rpc_force_rebind(clnt);
1856 rpc_delay(task, 3*HZ);
1857 case -EPIPE:
1858 case -ENOTCONN:
1859 task->tk_action = call_bind;
1860 break;
1861 case -EAGAIN:
1862 task->tk_action = call_transmit;
1863 break;
1864 case -EIO:
1865 /* shutdown or soft timeout */
1866 rpc_exit(task, status);
1867 break;
1868 default:
1869 if (clnt->cl_chatty)
1870 printk("%s: RPC call returned error %d\n",
1871 clnt->cl_protname, -status);
1872 rpc_exit(task, status);
1873 }
1874 }
1875
1876 /*
1877 * 6a. Handle RPC timeout
1878 * We do not release the request slot, so we keep using the
1879 * same XID for all retransmits.
1880 */
1881 static void
1882 call_timeout(struct rpc_task *task)
1883 {
1884 struct rpc_clnt *clnt = task->tk_client;
1885
1886 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1887 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1888 goto retry;
1889 }
1890
1891 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1892 task->tk_timeouts++;
1893
1894 if (RPC_IS_SOFTCONN(task)) {
1895 rpc_exit(task, -ETIMEDOUT);
1896 return;
1897 }
1898 if (RPC_IS_SOFT(task)) {
1899 if (clnt->cl_chatty) {
1900 rcu_read_lock();
1901 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1902 clnt->cl_protname,
1903 rcu_dereference(clnt->cl_xprt)->servername);
1904 rcu_read_unlock();
1905 }
1906 if (task->tk_flags & RPC_TASK_TIMEOUT)
1907 rpc_exit(task, -ETIMEDOUT);
1908 else
1909 rpc_exit(task, -EIO);
1910 return;
1911 }
1912
1913 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1914 task->tk_flags |= RPC_CALL_MAJORSEEN;
1915 if (clnt->cl_chatty) {
1916 rcu_read_lock();
1917 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1918 clnt->cl_protname,
1919 rcu_dereference(clnt->cl_xprt)->servername);
1920 rcu_read_unlock();
1921 }
1922 }
1923 rpc_force_rebind(clnt);
1924 /*
1925 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1926 * event? RFC2203 requires the server to drop all such requests.
1927 */
1928 rpcauth_invalcred(task);
1929
1930 retry:
1931 clnt->cl_stats->rpcretrans++;
1932 task->tk_action = call_bind;
1933 task->tk_status = 0;
1934 }
1935
1936 /*
1937 * 7. Decode the RPC reply
1938 */
1939 static void
1940 call_decode(struct rpc_task *task)
1941 {
1942 struct rpc_clnt *clnt = task->tk_client;
1943 struct rpc_rqst *req = task->tk_rqstp;
1944 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
1945 __be32 *p;
1946
1947 dprint_status(task);
1948
1949 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1950 if (clnt->cl_chatty) {
1951 rcu_read_lock();
1952 printk(KERN_NOTICE "%s: server %s OK\n",
1953 clnt->cl_protname,
1954 rcu_dereference(clnt->cl_xprt)->servername);
1955 rcu_read_unlock();
1956 }
1957 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1958 }
1959
1960 /*
1961 * Ensure that we see all writes made by xprt_complete_rqst()
1962 * before it changed req->rq_reply_bytes_recvd.
1963 */
1964 smp_rmb();
1965 req->rq_rcv_buf.len = req->rq_private_buf.len;
1966
1967 /* Check that the softirq receive buffer is valid */
1968 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1969 sizeof(req->rq_rcv_buf)) != 0);
1970
1971 if (req->rq_rcv_buf.len < 12) {
1972 if (!RPC_IS_SOFT(task)) {
1973 task->tk_action = call_bind;
1974 clnt->cl_stats->rpcretrans++;
1975 goto out_retry;
1976 }
1977 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1978 clnt->cl_protname, task->tk_status);
1979 task->tk_action = call_timeout;
1980 goto out_retry;
1981 }
1982
1983 p = rpc_verify_header(task);
1984 if (IS_ERR(p)) {
1985 if (p == ERR_PTR(-EAGAIN))
1986 goto out_retry;
1987 return;
1988 }
1989
1990 task->tk_action = rpc_exit_task;
1991
1992 if (decode) {
1993 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1994 task->tk_msg.rpc_resp);
1995 }
1996 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
1997 task->tk_status);
1998 return;
1999 out_retry:
2000 task->tk_status = 0;
2001 /* Note: rpc_verify_header() may have freed the RPC slot */
2002 if (task->tk_rqstp == req) {
2003 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
2004 if (task->tk_client->cl_discrtry)
2005 xprt_conditional_disconnect(req->rq_xprt,
2006 req->rq_connect_cookie);
2007 }
2008 }
2009
2010 static __be32 *
2011 rpc_encode_header(struct rpc_task *task)
2012 {
2013 struct rpc_clnt *clnt = task->tk_client;
2014 struct rpc_rqst *req = task->tk_rqstp;
2015 __be32 *p = req->rq_svec[0].iov_base;
2016
2017 /* FIXME: check buffer size? */
2018
2019 p = xprt_skip_transport_header(req->rq_xprt, p);
2020 *p++ = req->rq_xid; /* XID */
2021 *p++ = htonl(RPC_CALL); /* CALL */
2022 *p++ = htonl(RPC_VERSION); /* RPC version */
2023 *p++ = htonl(clnt->cl_prog); /* program number */
2024 *p++ = htonl(clnt->cl_vers); /* program version */
2025 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
2026 p = rpcauth_marshcred(task, p);
2027 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2028 return p;
2029 }
2030
2031 static __be32 *
2032 rpc_verify_header(struct rpc_task *task)
2033 {
2034 struct rpc_clnt *clnt = task->tk_client;
2035 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2036 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2037 __be32 *p = iov->iov_base;
2038 u32 n;
2039 int error = -EACCES;
2040
2041 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2042 /* RFC-1014 says that the representation of XDR data must be a
2043 * multiple of four bytes
2044 * - if it isn't pointer subtraction in the NFS client may give
2045 * undefined results
2046 */
2047 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2048 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2049 task->tk_rqstp->rq_rcv_buf.len);
2050 goto out_eio;
2051 }
2052 if ((len -= 3) < 0)
2053 goto out_overflow;
2054
2055 p += 1; /* skip XID */
2056 if ((n = ntohl(*p++)) != RPC_REPLY) {
2057 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2058 task->tk_pid, __func__, n);
2059 goto out_garbage;
2060 }
2061
2062 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2063 if (--len < 0)
2064 goto out_overflow;
2065 switch ((n = ntohl(*p++))) {
2066 case RPC_AUTH_ERROR:
2067 break;
2068 case RPC_MISMATCH:
2069 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2070 task->tk_pid, __func__);
2071 error = -EPROTONOSUPPORT;
2072 goto out_err;
2073 default:
2074 dprintk("RPC: %5u %s: RPC call rejected, "
2075 "unknown error: %x\n",
2076 task->tk_pid, __func__, n);
2077 goto out_eio;
2078 }
2079 if (--len < 0)
2080 goto out_overflow;
2081 switch ((n = ntohl(*p++))) {
2082 case RPC_AUTH_REJECTEDCRED:
2083 case RPC_AUTH_REJECTEDVERF:
2084 case RPCSEC_GSS_CREDPROBLEM:
2085 case RPCSEC_GSS_CTXPROBLEM:
2086 if (!task->tk_cred_retry)
2087 break;
2088 task->tk_cred_retry--;
2089 dprintk("RPC: %5u %s: retry stale creds\n",
2090 task->tk_pid, __func__);
2091 rpcauth_invalcred(task);
2092 /* Ensure we obtain a new XID! */
2093 xprt_release(task);
2094 task->tk_action = call_reserve;
2095 goto out_retry;
2096 case RPC_AUTH_BADCRED:
2097 case RPC_AUTH_BADVERF:
2098 /* possibly garbled cred/verf? */
2099 if (!task->tk_garb_retry)
2100 break;
2101 task->tk_garb_retry--;
2102 dprintk("RPC: %5u %s: retry garbled creds\n",
2103 task->tk_pid, __func__);
2104 task->tk_action = call_bind;
2105 goto out_retry;
2106 case RPC_AUTH_TOOWEAK:
2107 rcu_read_lock();
2108 printk(KERN_NOTICE "RPC: server %s requires stronger "
2109 "authentication.\n",
2110 rcu_dereference(clnt->cl_xprt)->servername);
2111 rcu_read_unlock();
2112 break;
2113 default:
2114 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2115 task->tk_pid, __func__, n);
2116 error = -EIO;
2117 }
2118 dprintk("RPC: %5u %s: call rejected %d\n",
2119 task->tk_pid, __func__, n);
2120 goto out_err;
2121 }
2122 if (!(p = rpcauth_checkverf(task, p))) {
2123 dprintk("RPC: %5u %s: auth check failed\n",
2124 task->tk_pid, __func__);
2125 goto out_garbage; /* bad verifier, retry */
2126 }
2127 len = p - (__be32 *)iov->iov_base - 1;
2128 if (len < 0)
2129 goto out_overflow;
2130 switch ((n = ntohl(*p++))) {
2131 case RPC_SUCCESS:
2132 return p;
2133 case RPC_PROG_UNAVAIL:
2134 dprintk_rcu("RPC: %5u %s: program %u is unsupported "
2135 "by server %s\n", task->tk_pid, __func__,
2136 (unsigned int)clnt->cl_prog,
2137 rcu_dereference(clnt->cl_xprt)->servername);
2138 error = -EPFNOSUPPORT;
2139 goto out_err;
2140 case RPC_PROG_MISMATCH:
2141 dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
2142 "by server %s\n", task->tk_pid, __func__,
2143 (unsigned int)clnt->cl_prog,
2144 (unsigned int)clnt->cl_vers,
2145 rcu_dereference(clnt->cl_xprt)->servername);
2146 error = -EPROTONOSUPPORT;
2147 goto out_err;
2148 case RPC_PROC_UNAVAIL:
2149 dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
2150 "version %u on server %s\n",
2151 task->tk_pid, __func__,
2152 rpc_proc_name(task),
2153 clnt->cl_prog, clnt->cl_vers,
2154 rcu_dereference(clnt->cl_xprt)->servername);
2155 error = -EOPNOTSUPP;
2156 goto out_err;
2157 case RPC_GARBAGE_ARGS:
2158 dprintk("RPC: %5u %s: server saw garbage\n",
2159 task->tk_pid, __func__);
2160 break; /* retry */
2161 default:
2162 dprintk("RPC: %5u %s: server accept status: %x\n",
2163 task->tk_pid, __func__, n);
2164 /* Also retry */
2165 }
2166
2167 out_garbage:
2168 clnt->cl_stats->rpcgarbage++;
2169 if (task->tk_garb_retry) {
2170 task->tk_garb_retry--;
2171 dprintk("RPC: %5u %s: retrying\n",
2172 task->tk_pid, __func__);
2173 task->tk_action = call_bind;
2174 out_retry:
2175 return ERR_PTR(-EAGAIN);
2176 }
2177 out_eio:
2178 error = -EIO;
2179 out_err:
2180 rpc_exit(task, error);
2181 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2182 __func__, error);
2183 return ERR_PTR(error);
2184 out_overflow:
2185 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2186 __func__);
2187 goto out_garbage;
2188 }
2189
2190 static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2191 {
2192 }
2193
2194 static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2195 {
2196 return 0;
2197 }
2198
2199 static struct rpc_procinfo rpcproc_null = {
2200 .p_encode = rpcproc_encode_null,
2201 .p_decode = rpcproc_decode_null,
2202 };
2203
2204 static int rpc_ping(struct rpc_clnt *clnt)
2205 {
2206 struct rpc_message msg = {
2207 .rpc_proc = &rpcproc_null,
2208 };
2209 int err;
2210 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2211 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2212 put_rpccred(msg.rpc_cred);
2213 return err;
2214 }
2215
2216 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2217 {
2218 struct rpc_message msg = {
2219 .rpc_proc = &rpcproc_null,
2220 .rpc_cred = cred,
2221 };
2222 struct rpc_task_setup task_setup_data = {
2223 .rpc_client = clnt,
2224 .rpc_message = &msg,
2225 .callback_ops = &rpc_default_ops,
2226 .flags = flags,
2227 };
2228 return rpc_run_task(&task_setup_data);
2229 }
2230 EXPORT_SYMBOL_GPL(rpc_call_null);
2231
2232 #ifdef RPC_DEBUG
2233 static void rpc_show_header(void)
2234 {
2235 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2236 "-timeout ---ops--\n");
2237 }
2238
2239 static void rpc_show_task(const struct rpc_clnt *clnt,
2240 const struct rpc_task *task)
2241 {
2242 const char *rpc_waitq = "none";
2243
2244 if (RPC_IS_QUEUED(task))
2245 rpc_waitq = rpc_qname(task->tk_waitqueue);
2246
2247 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2248 task->tk_pid, task->tk_flags, task->tk_status,
2249 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2250 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
2251 task->tk_action, rpc_waitq);
2252 }
2253
2254 void rpc_show_tasks(struct net *net)
2255 {
2256 struct rpc_clnt *clnt;
2257 struct rpc_task *task;
2258 int header = 0;
2259 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2260
2261 spin_lock(&sn->rpc_client_lock);
2262 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2263 spin_lock(&clnt->cl_lock);
2264 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2265 if (!header) {
2266 rpc_show_header();
2267 header++;
2268 }
2269 rpc_show_task(clnt, task);
2270 }
2271 spin_unlock(&clnt->cl_lock);
2272 }
2273 spin_unlock(&sn->rpc_client_lock);
2274 }
2275 #endif
kernel source for telekom puls (alcatel/mediatek)