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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/rcupdate.h>
29#include <linux/utsname.h>
30#include <linux/workqueue.h>
31#include <linux/in.h>
32#include <linux/in6.h>
33#include <linux/un.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#if IS_ENABLED(CONFIG_SUNRPC_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
55
56
57static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
58
59
60static void call_start(struct rpc_task *task);
61static void call_reserve(struct rpc_task *task);
62static void call_reserveresult(struct rpc_task *task);
63static void call_allocate(struct rpc_task *task);
64static void call_decode(struct rpc_task *task);
65static void call_bind(struct rpc_task *task);
66static void call_bind_status(struct rpc_task *task);
67static void call_transmit(struct rpc_task *task);
68#if defined(CONFIG_SUNRPC_BACKCHANNEL)
69static void call_bc_transmit(struct rpc_task *task);
70#endif
71static void call_status(struct rpc_task *task);
72static void call_transmit_status(struct rpc_task *task);
73static void call_refresh(struct rpc_task *task);
74static void call_refreshresult(struct rpc_task *task);
75static void call_timeout(struct rpc_task *task);
76static void call_connect(struct rpc_task *task);
77static void call_connect_status(struct rpc_task *task);
78
79static __be32 *rpc_encode_header(struct rpc_task *task);
80static __be32 *rpc_verify_header(struct rpc_task *task);
81static int rpc_ping(struct rpc_clnt *clnt);
82
83static 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
93static 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
103static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
104{
105 rpc_remove_client_dir(clnt);
106}
107
108static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
109{
110 struct net *net = rpc_net_ns(clnt);
111 struct super_block *pipefs_sb;
112
113 pipefs_sb = rpc_get_sb_net(net);
114 if (pipefs_sb) {
115 __rpc_clnt_remove_pipedir(clnt);
116 rpc_put_sb_net(net);
117 }
118}
119
120static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
121 struct rpc_clnt *clnt)
122{
123 static uint32_t clntid;
124 const char *dir_name = clnt->cl_program->pipe_dir_name;
125 char name[15];
126 struct dentry *dir, *dentry;
127
128 dir = rpc_d_lookup_sb(sb, dir_name);
129 if (dir == NULL) {
130 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
131 return dir;
132 }
133 for (;;) {
134 snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
135 name[sizeof(name) - 1] = '\0';
136 dentry = rpc_create_client_dir(dir, name, clnt);
137 if (!IS_ERR(dentry))
138 break;
139 if (dentry == ERR_PTR(-EEXIST))
140 continue;
141 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
142 " %s/%s, error %ld\n",
143 dir_name, name, PTR_ERR(dentry));
144 break;
145 }
146 dput(dir);
147 return dentry;
148}
149
150static int
151rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt)
152{
153 struct dentry *dentry;
154
155 if (clnt->cl_program->pipe_dir_name != NULL) {
156 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt);
157 if (IS_ERR(dentry))
158 return PTR_ERR(dentry);
159 }
160 return 0;
161}
162
163static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
164{
165 if (clnt->cl_program->pipe_dir_name == NULL)
166 return 1;
167
168 switch (event) {
169 case RPC_PIPEFS_MOUNT:
170 if (clnt->cl_pipedir_objects.pdh_dentry != NULL)
171 return 1;
172 if (atomic_read(&clnt->cl_count) == 0)
173 return 1;
174 break;
175 case RPC_PIPEFS_UMOUNT:
176 if (clnt->cl_pipedir_objects.pdh_dentry == NULL)
177 return 1;
178 break;
179 }
180 return 0;
181}
182
183static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
184 struct super_block *sb)
185{
186 struct dentry *dentry;
187
188 switch (event) {
189 case RPC_PIPEFS_MOUNT:
190 dentry = rpc_setup_pipedir_sb(sb, clnt);
191 if (!dentry)
192 return -ENOENT;
193 if (IS_ERR(dentry))
194 return PTR_ERR(dentry);
195 break;
196 case RPC_PIPEFS_UMOUNT:
197 __rpc_clnt_remove_pipedir(clnt);
198 break;
199 default:
200 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
201 return -ENOTSUPP;
202 }
203 return 0;
204}
205
206static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
207 struct super_block *sb)
208{
209 int error = 0;
210
211 for (;; clnt = clnt->cl_parent) {
212 if (!rpc_clnt_skip_event(clnt, event))
213 error = __rpc_clnt_handle_event(clnt, event, sb);
214 if (error || clnt == clnt->cl_parent)
215 break;
216 }
217 return error;
218}
219
220static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
221{
222 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
223 struct rpc_clnt *clnt;
224
225 spin_lock(&sn->rpc_client_lock);
226 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
227 if (rpc_clnt_skip_event(clnt, event))
228 continue;
229 spin_unlock(&sn->rpc_client_lock);
230 return clnt;
231 }
232 spin_unlock(&sn->rpc_client_lock);
233 return NULL;
234}
235
236static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
237 void *ptr)
238{
239 struct super_block *sb = ptr;
240 struct rpc_clnt *clnt;
241 int error = 0;
242
243 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
244 error = __rpc_pipefs_event(clnt, event, sb);
245 if (error)
246 break;
247 }
248 return error;
249}
250
251static struct notifier_block rpc_clients_block = {
252 .notifier_call = rpc_pipefs_event,
253 .priority = SUNRPC_PIPEFS_RPC_PRIO,
254};
255
256int rpc_clients_notifier_register(void)
257{
258 return rpc_pipefs_notifier_register(&rpc_clients_block);
259}
260
261void rpc_clients_notifier_unregister(void)
262{
263 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
264}
265
266static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
267 struct rpc_xprt *xprt,
268 const struct rpc_timeout *timeout)
269{
270 struct rpc_xprt *old;
271
272 spin_lock(&clnt->cl_lock);
273 old = rcu_dereference_protected(clnt->cl_xprt,
274 lockdep_is_held(&clnt->cl_lock));
275
276 if (!xprt_bound(xprt))
277 clnt->cl_autobind = 1;
278
279 clnt->cl_timeout = timeout;
280 rcu_assign_pointer(clnt->cl_xprt, xprt);
281 spin_unlock(&clnt->cl_lock);
282
283 return old;
284}
285
286static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
287{
288 clnt->cl_nodelen = strlcpy(clnt->cl_nodename,
289 nodename, sizeof(clnt->cl_nodename));
290}
291
292static int rpc_client_register(struct rpc_clnt *clnt,
293 rpc_authflavor_t pseudoflavor,
294 const char *client_name)
295{
296 struct rpc_auth_create_args auth_args = {
297 .pseudoflavor = pseudoflavor,
298 .target_name = client_name,
299 };
300 struct rpc_auth *auth;
301 struct net *net = rpc_net_ns(clnt);
302 struct super_block *pipefs_sb;
303 int err;
304
305 rpc_clnt_debugfs_register(clnt);
306
307 pipefs_sb = rpc_get_sb_net(net);
308 if (pipefs_sb) {
309 err = rpc_setup_pipedir(pipefs_sb, clnt);
310 if (err)
311 goto out;
312 }
313
314 rpc_register_client(clnt);
315 if (pipefs_sb)
316 rpc_put_sb_net(net);
317
318 auth = rpcauth_create(&auth_args, clnt);
319 if (IS_ERR(auth)) {
320 dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
321 pseudoflavor);
322 err = PTR_ERR(auth);
323 goto err_auth;
324 }
325 return 0;
326err_auth:
327 pipefs_sb = rpc_get_sb_net(net);
328 rpc_unregister_client(clnt);
329 __rpc_clnt_remove_pipedir(clnt);
330out:
331 if (pipefs_sb)
332 rpc_put_sb_net(net);
333 rpc_clnt_debugfs_unregister(clnt);
334 return err;
335}
336
337static DEFINE_IDA(rpc_clids);
338
339void rpc_cleanup_clids(void)
340{
341 ida_destroy(&rpc_clids);
342}
343
344static int rpc_alloc_clid(struct rpc_clnt *clnt)
345{
346 int clid;
347
348 clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
349 if (clid < 0)
350 return clid;
351 clnt->cl_clid = clid;
352 return 0;
353}
354
355static void rpc_free_clid(struct rpc_clnt *clnt)
356{
357 ida_simple_remove(&rpc_clids, clnt->cl_clid);
358}
359
360static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
361 struct rpc_xprt_switch *xps,
362 struct rpc_xprt *xprt,
363 struct rpc_clnt *parent)
364{
365 const struct rpc_program *program = args->program;
366 const struct rpc_version *version;
367 struct rpc_clnt *clnt = NULL;
368 const struct rpc_timeout *timeout;
369 const char *nodename = args->nodename;
370 int err;
371
372
373 dprintk("RPC: creating %s client for %s (xprt %p)\n",
374 program->name, args->servername, xprt);
375
376 err = rpciod_up();
377 if (err)
378 goto out_no_rpciod;
379
380 err = -EINVAL;
381 if (args->version >= program->nrvers)
382 goto out_err;
383 version = program->version[args->version];
384 if (version == NULL)
385 goto out_err;
386
387 err = -ENOMEM;
388 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
389 if (!clnt)
390 goto out_err;
391 clnt->cl_parent = parent ? : clnt;
392
393 err = rpc_alloc_clid(clnt);
394 if (err)
395 goto out_no_clid;
396
397 clnt->cl_procinfo = version->procs;
398 clnt->cl_maxproc = version->nrprocs;
399 clnt->cl_prog = args->prognumber ? : program->number;
400 clnt->cl_vers = version->number;
401 clnt->cl_stats = program->stats;
402 clnt->cl_metrics = rpc_alloc_iostats(clnt);
403 rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
404 err = -ENOMEM;
405 if (clnt->cl_metrics == NULL)
406 goto out_no_stats;
407 clnt->cl_program = program;
408 INIT_LIST_HEAD(&clnt->cl_tasks);
409 spin_lock_init(&clnt->cl_lock);
410
411 timeout = xprt->timeout;
412 if (args->timeout != NULL) {
413 memcpy(&clnt->cl_timeout_default, args->timeout,
414 sizeof(clnt->cl_timeout_default));
415 timeout = &clnt->cl_timeout_default;
416 }
417
418 rpc_clnt_set_transport(clnt, xprt, timeout);
419 xprt_iter_init(&clnt->cl_xpi, xps);
420 xprt_switch_put(xps);
421
422 clnt->cl_rtt = &clnt->cl_rtt_default;
423 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
424
425 atomic_set(&clnt->cl_count, 1);
426
427 if (nodename == NULL)
428 nodename = utsname()->nodename;
429
430 rpc_clnt_set_nodename(clnt, nodename);
431
432 err = rpc_client_register(clnt, args->authflavor, args->client_name);
433 if (err)
434 goto out_no_path;
435 if (parent)
436 atomic_inc(&parent->cl_count);
437 return clnt;
438
439out_no_path:
440 rpc_free_iostats(clnt->cl_metrics);
441out_no_stats:
442 rpc_free_clid(clnt);
443out_no_clid:
444 kfree(clnt);
445out_err:
446 rpciod_down();
447out_no_rpciod:
448 xprt_switch_put(xps);
449 xprt_put(xprt);
450 return ERR_PTR(err);
451}
452
453static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
454 struct rpc_xprt *xprt)
455{
456 struct rpc_clnt *clnt = NULL;
457 struct rpc_xprt_switch *xps;
458
459 if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) {
460 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
461 xps = args->bc_xprt->xpt_bc_xps;
462 xprt_switch_get(xps);
463 } else {
464 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
465 if (xps == NULL) {
466 xprt_put(xprt);
467 return ERR_PTR(-ENOMEM);
468 }
469 if (xprt->bc_xprt) {
470 xprt_switch_get(xps);
471 xprt->bc_xprt->xpt_bc_xps = xps;
472 }
473 }
474 clnt = rpc_new_client(args, xps, xprt, NULL);
475 if (IS_ERR(clnt))
476 return clnt;
477
478 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
479 int err = rpc_ping(clnt);
480 if (err != 0) {
481 rpc_shutdown_client(clnt);
482 return ERR_PTR(err);
483 }
484 }
485
486 clnt->cl_softrtry = 1;
487 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
488 clnt->cl_softrtry = 0;
489
490 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
491 clnt->cl_autobind = 1;
492 if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
493 clnt->cl_noretranstimeo = 1;
494 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
495 clnt->cl_discrtry = 1;
496 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
497 clnt->cl_chatty = 1;
498
499 return clnt;
500}
501
502
503
504
505
506
507
508
509
510
511
512struct rpc_clnt *rpc_create(struct rpc_create_args *args)
513{
514 struct rpc_xprt *xprt;
515 struct xprt_create xprtargs = {
516 .net = args->net,
517 .ident = args->protocol,
518 .srcaddr = args->saddress,
519 .dstaddr = args->address,
520 .addrlen = args->addrsize,
521 .servername = args->servername,
522 .bc_xprt = args->bc_xprt,
523 };
524 char servername[48];
525
526 if (args->bc_xprt) {
527 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
528 xprt = args->bc_xprt->xpt_bc_xprt;
529 if (xprt) {
530 xprt_get(xprt);
531 return rpc_create_xprt(args, xprt);
532 }
533 }
534
535 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
536 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
537 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
538 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
539
540
541
542
543 if (xprtargs.servername == NULL) {
544 struct sockaddr_un *sun =
545 (struct sockaddr_un *)args->address;
546 struct sockaddr_in *sin =
547 (struct sockaddr_in *)args->address;
548 struct sockaddr_in6 *sin6 =
549 (struct sockaddr_in6 *)args->address;
550
551 servername[0] = '\0';
552 switch (args->address->sa_family) {
553 case AF_LOCAL:
554 snprintf(servername, sizeof(servername), "%s",
555 sun->sun_path);
556 break;
557 case AF_INET:
558 snprintf(servername, sizeof(servername), "%pI4",
559 &sin->sin_addr.s_addr);
560 break;
561 case AF_INET6:
562 snprintf(servername, sizeof(servername), "%pI6",
563 &sin6->sin6_addr);
564 break;
565 default:
566
567
568 return ERR_PTR(-EINVAL);
569 }
570 xprtargs.servername = servername;
571 }
572
573 xprt = xprt_create_transport(&xprtargs);
574 if (IS_ERR(xprt))
575 return (struct rpc_clnt *)xprt;
576
577
578
579
580
581
582
583 xprt->resvport = 1;
584 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
585 xprt->resvport = 0;
586
587 return rpc_create_xprt(args, xprt);
588}
589EXPORT_SYMBOL_GPL(rpc_create);
590
591
592
593
594
595
596static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
597 struct rpc_clnt *clnt)
598{
599 struct rpc_xprt_switch *xps;
600 struct rpc_xprt *xprt;
601 struct rpc_clnt *new;
602 int err;
603
604 err = -ENOMEM;
605 rcu_read_lock();
606 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
607 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
608 rcu_read_unlock();
609 if (xprt == NULL || xps == NULL) {
610 xprt_put(xprt);
611 xprt_switch_put(xps);
612 goto out_err;
613 }
614 args->servername = xprt->servername;
615 args->nodename = clnt->cl_nodename;
616
617 new = rpc_new_client(args, xps, xprt, clnt);
618 if (IS_ERR(new)) {
619 err = PTR_ERR(new);
620 goto out_err;
621 }
622
623
624 new->cl_autobind = 0;
625 new->cl_softrtry = clnt->cl_softrtry;
626 new->cl_noretranstimeo = clnt->cl_noretranstimeo;
627 new->cl_discrtry = clnt->cl_discrtry;
628 new->cl_chatty = clnt->cl_chatty;
629 return new;
630
631out_err:
632 dprintk("RPC: %s: returned error %d\n", __func__, err);
633 return ERR_PTR(err);
634}
635
636
637
638
639
640
641
642
643struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
644{
645 struct rpc_create_args args = {
646 .program = clnt->cl_program,
647 .prognumber = clnt->cl_prog,
648 .version = clnt->cl_vers,
649 .authflavor = clnt->cl_auth->au_flavor,
650 };
651 return __rpc_clone_client(&args, clnt);
652}
653EXPORT_SYMBOL_GPL(rpc_clone_client);
654
655
656
657
658
659
660
661
662
663struct rpc_clnt *
664rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
665{
666 struct rpc_create_args args = {
667 .program = clnt->cl_program,
668 .prognumber = clnt->cl_prog,
669 .version = clnt->cl_vers,
670 .authflavor = flavor,
671 };
672 return __rpc_clone_client(&args, clnt);
673}
674EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691int rpc_switch_client_transport(struct rpc_clnt *clnt,
692 struct xprt_create *args,
693 const struct rpc_timeout *timeout)
694{
695 const struct rpc_timeout *old_timeo;
696 rpc_authflavor_t pseudoflavor;
697 struct rpc_xprt_switch *xps, *oldxps;
698 struct rpc_xprt *xprt, *old;
699 struct rpc_clnt *parent;
700 int err;
701
702 xprt = xprt_create_transport(args);
703 if (IS_ERR(xprt)) {
704 dprintk("RPC: failed to create new xprt for clnt %p\n",
705 clnt);
706 return PTR_ERR(xprt);
707 }
708
709 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
710 if (xps == NULL) {
711 xprt_put(xprt);
712 return -ENOMEM;
713 }
714
715 pseudoflavor = clnt->cl_auth->au_flavor;
716
717 old_timeo = clnt->cl_timeout;
718 old = rpc_clnt_set_transport(clnt, xprt, timeout);
719 oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps);
720
721 rpc_unregister_client(clnt);
722 __rpc_clnt_remove_pipedir(clnt);
723 rpc_clnt_debugfs_unregister(clnt);
724
725
726
727
728
729
730 parent = clnt->cl_parent;
731 clnt->cl_parent = clnt;
732
733
734
735
736
737
738 err = rpc_client_register(clnt, pseudoflavor, NULL);
739 if (err)
740 goto out_revert;
741
742 synchronize_rcu();
743 if (parent != clnt)
744 rpc_release_client(parent);
745 xprt_switch_put(oldxps);
746 xprt_put(old);
747 dprintk("RPC: replaced xprt for clnt %p\n", clnt);
748 return 0;
749
750out_revert:
751 xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps);
752 rpc_clnt_set_transport(clnt, old, old_timeo);
753 clnt->cl_parent = parent;
754 rpc_client_register(clnt, pseudoflavor, NULL);
755 xprt_switch_put(xps);
756 xprt_put(xprt);
757 dprintk("RPC: failed to switch xprt for clnt %p\n", clnt);
758 return err;
759}
760EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
761
762static
763int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi)
764{
765 struct rpc_xprt_switch *xps;
766
767 rcu_read_lock();
768 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
769 rcu_read_unlock();
770 if (xps == NULL)
771 return -EAGAIN;
772 xprt_iter_init_listall(xpi, xps);
773 xprt_switch_put(xps);
774 return 0;
775}
776
777
778
779
780
781
782
783
784
785
786
787
788int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
789 int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
790 void *data)
791{
792 struct rpc_xprt_iter xpi;
793 int ret;
794
795 ret = rpc_clnt_xprt_iter_init(clnt, &xpi);
796 if (ret)
797 return ret;
798 for (;;) {
799 struct rpc_xprt *xprt = xprt_iter_get_next(&xpi);
800
801 if (!xprt)
802 break;
803 ret = fn(clnt, xprt, data);
804 xprt_put(xprt);
805 if (ret < 0)
806 break;
807 }
808 xprt_iter_destroy(&xpi);
809 return ret;
810}
811EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt);
812
813
814
815
816
817void rpc_killall_tasks(struct rpc_clnt *clnt)
818{
819 struct rpc_task *rovr;
820
821
822 if (list_empty(&clnt->cl_tasks))
823 return;
824 dprintk("RPC: killing all tasks for client %p\n", clnt);
825
826
827
828 spin_lock(&clnt->cl_lock);
829 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
830 if (!RPC_IS_ACTIVATED(rovr))
831 continue;
832 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
833 rovr->tk_flags |= RPC_TASK_KILLED;
834 rpc_exit(rovr, -EIO);
835 if (RPC_IS_QUEUED(rovr))
836 rpc_wake_up_queued_task(rovr->tk_waitqueue,
837 rovr);
838 }
839 }
840 spin_unlock(&clnt->cl_lock);
841}
842EXPORT_SYMBOL_GPL(rpc_killall_tasks);
843
844
845
846
847
848void rpc_shutdown_client(struct rpc_clnt *clnt)
849{
850 might_sleep();
851
852 dprintk_rcu("RPC: shutting down %s client for %s\n",
853 clnt->cl_program->name,
854 rcu_dereference(clnt->cl_xprt)->servername);
855
856 while (!list_empty(&clnt->cl_tasks)) {
857 rpc_killall_tasks(clnt);
858 wait_event_timeout(destroy_wait,
859 list_empty(&clnt->cl_tasks), 1*HZ);
860 }
861
862 rpc_release_client(clnt);
863}
864EXPORT_SYMBOL_GPL(rpc_shutdown_client);
865
866
867
868
869static struct rpc_clnt *
870rpc_free_client(struct rpc_clnt *clnt)
871{
872 struct rpc_clnt *parent = NULL;
873
874 dprintk_rcu("RPC: destroying %s client for %s\n",
875 clnt->cl_program->name,
876 rcu_dereference(clnt->cl_xprt)->servername);
877 if (clnt->cl_parent != clnt)
878 parent = clnt->cl_parent;
879 rpc_clnt_debugfs_unregister(clnt);
880 rpc_clnt_remove_pipedir(clnt);
881 rpc_unregister_client(clnt);
882 rpc_free_iostats(clnt->cl_metrics);
883 clnt->cl_metrics = NULL;
884 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
885 xprt_iter_destroy(&clnt->cl_xpi);
886 rpciod_down();
887 rpc_free_clid(clnt);
888 kfree(clnt);
889 return parent;
890}
891
892
893
894
895static struct rpc_clnt *
896rpc_free_auth(struct rpc_clnt *clnt)
897{
898 if (clnt->cl_auth == NULL)
899 return rpc_free_client(clnt);
900
901
902
903
904
905
906 atomic_inc(&clnt->cl_count);
907 rpcauth_release(clnt->cl_auth);
908 clnt->cl_auth = NULL;
909 if (atomic_dec_and_test(&clnt->cl_count))
910 return rpc_free_client(clnt);
911 return NULL;
912}
913
914
915
916
917void
918rpc_release_client(struct rpc_clnt *clnt)
919{
920 dprintk("RPC: rpc_release_client(%p)\n", clnt);
921
922 do {
923 if (list_empty(&clnt->cl_tasks))
924 wake_up(&destroy_wait);
925 if (!atomic_dec_and_test(&clnt->cl_count))
926 break;
927 clnt = rpc_free_auth(clnt);
928 } while (clnt != NULL);
929}
930EXPORT_SYMBOL_GPL(rpc_release_client);
931
932
933
934
935
936
937
938
939
940
941
942struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
943 const struct rpc_program *program,
944 u32 vers)
945{
946 struct rpc_create_args args = {
947 .program = program,
948 .prognumber = program->number,
949 .version = vers,
950 .authflavor = old->cl_auth->au_flavor,
951 };
952 struct rpc_clnt *clnt;
953 int err;
954
955 clnt = __rpc_clone_client(&args, old);
956 if (IS_ERR(clnt))
957 goto out;
958 err = rpc_ping(clnt);
959 if (err != 0) {
960 rpc_shutdown_client(clnt);
961 clnt = ERR_PTR(err);
962 }
963out:
964 return clnt;
965}
966EXPORT_SYMBOL_GPL(rpc_bind_new_program);
967
968void rpc_task_release_client(struct rpc_task *task)
969{
970 struct rpc_clnt *clnt = task->tk_client;
971 struct rpc_xprt *xprt = task->tk_xprt;
972
973 if (clnt != NULL) {
974
975 spin_lock(&clnt->cl_lock);
976 list_del(&task->tk_task);
977 spin_unlock(&clnt->cl_lock);
978 task->tk_client = NULL;
979
980 rpc_release_client(clnt);
981 }
982
983 if (xprt != NULL) {
984 task->tk_xprt = NULL;
985
986 xprt_put(xprt);
987 }
988}
989
990static
991void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
992{
993
994 if (clnt != NULL) {
995 if (task->tk_xprt == NULL)
996 task->tk_xprt = xprt_iter_get_next(&clnt->cl_xpi);
997 task->tk_client = clnt;
998 atomic_inc(&clnt->cl_count);
999 if (clnt->cl_softrtry)
1000 task->tk_flags |= RPC_TASK_SOFT;
1001 if (clnt->cl_noretranstimeo)
1002 task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
1003 if (atomic_read(&clnt->cl_swapper))
1004 task->tk_flags |= RPC_TASK_SWAPPER;
1005
1006 spin_lock(&clnt->cl_lock);
1007 list_add_tail(&task->tk_task, &clnt->cl_tasks);
1008 spin_unlock(&clnt->cl_lock);
1009 }
1010}
1011
1012static void
1013rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
1014{
1015 if (msg != NULL) {
1016 task->tk_msg.rpc_proc = msg->rpc_proc;
1017 task->tk_msg.rpc_argp = msg->rpc_argp;
1018 task->tk_msg.rpc_resp = msg->rpc_resp;
1019 if (msg->rpc_cred != NULL)
1020 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
1021 }
1022}
1023
1024
1025
1026
1027static void
1028rpc_default_callback(struct rpc_task *task, void *data)
1029{
1030}
1031
1032static const struct rpc_call_ops rpc_default_ops = {
1033 .rpc_call_done = rpc_default_callback,
1034};
1035
1036
1037
1038
1039
1040struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
1041{
1042 struct rpc_task *task;
1043
1044 task = rpc_new_task(task_setup_data);
1045
1046 rpc_task_set_client(task, task_setup_data->rpc_client);
1047 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
1048
1049 if (task->tk_action == NULL)
1050 rpc_call_start(task);
1051
1052 atomic_inc(&task->tk_count);
1053 rpc_execute(task);
1054 return task;
1055}
1056EXPORT_SYMBOL_GPL(rpc_run_task);
1057
1058
1059
1060
1061
1062
1063
1064int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
1065{
1066 struct rpc_task *task;
1067 struct rpc_task_setup task_setup_data = {
1068 .rpc_client = clnt,
1069 .rpc_message = msg,
1070 .callback_ops = &rpc_default_ops,
1071 .flags = flags,
1072 };
1073 int status;
1074
1075 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
1076 if (flags & RPC_TASK_ASYNC) {
1077 rpc_release_calldata(task_setup_data.callback_ops,
1078 task_setup_data.callback_data);
1079 return -EINVAL;
1080 }
1081
1082 task = rpc_run_task(&task_setup_data);
1083 if (IS_ERR(task))
1084 return PTR_ERR(task);
1085 status = task->tk_status;
1086 rpc_put_task(task);
1087 return status;
1088}
1089EXPORT_SYMBOL_GPL(rpc_call_sync);
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099int
1100rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
1101 const struct rpc_call_ops *tk_ops, void *data)
1102{
1103 struct rpc_task *task;
1104 struct rpc_task_setup task_setup_data = {
1105 .rpc_client = clnt,
1106 .rpc_message = msg,
1107 .callback_ops = tk_ops,
1108 .callback_data = data,
1109 .flags = flags|RPC_TASK_ASYNC,
1110 };
1111
1112 task = rpc_run_task(&task_setup_data);
1113 if (IS_ERR(task))
1114 return PTR_ERR(task);
1115 rpc_put_task(task);
1116 return 0;
1117}
1118EXPORT_SYMBOL_GPL(rpc_call_async);
1119
1120#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1121
1122
1123
1124
1125
1126struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
1127{
1128 struct rpc_task *task;
1129 struct xdr_buf *xbufp = &req->rq_snd_buf;
1130 struct rpc_task_setup task_setup_data = {
1131 .callback_ops = &rpc_default_ops,
1132 .flags = RPC_TASK_SOFTCONN,
1133 };
1134
1135 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
1136
1137
1138
1139 task = rpc_new_task(&task_setup_data);
1140 task->tk_rqstp = req;
1141
1142
1143
1144
1145
1146 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
1147 xbufp->tail[0].iov_len;
1148
1149 task->tk_action = call_bc_transmit;
1150 atomic_inc(&task->tk_count);
1151 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
1152 rpc_execute(task);
1153
1154 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
1155 return task;
1156}
1157#endif
1158
1159void
1160rpc_call_start(struct rpc_task *task)
1161{
1162 task->tk_action = call_start;
1163}
1164EXPORT_SYMBOL_GPL(rpc_call_start);
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
1175{
1176 size_t bytes;
1177 struct rpc_xprt *xprt;
1178
1179 rcu_read_lock();
1180 xprt = rcu_dereference(clnt->cl_xprt);
1181
1182 bytes = xprt->addrlen;
1183 if (bytes > bufsize)
1184 bytes = bufsize;
1185 memcpy(buf, &xprt->addr, bytes);
1186 rcu_read_unlock();
1187
1188 return bytes;
1189}
1190EXPORT_SYMBOL_GPL(rpc_peeraddr);
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
1202 enum rpc_display_format_t format)
1203{
1204 struct rpc_xprt *xprt;
1205
1206 xprt = rcu_dereference(clnt->cl_xprt);
1207
1208 if (xprt->address_strings[format] != NULL)
1209 return xprt->address_strings[format];
1210 else
1211 return "unprintable";
1212}
1213EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
1214
1215static const struct sockaddr_in rpc_inaddr_loopback = {
1216 .sin_family = AF_INET,
1217 .sin_addr.s_addr = htonl(INADDR_ANY),
1218};
1219
1220static const struct sockaddr_in6 rpc_in6addr_loopback = {
1221 .sin6_family = AF_INET6,
1222 .sin6_addr = IN6ADDR_ANY_INIT,
1223};
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1234 struct sockaddr *buf)
1235{
1236 struct socket *sock;
1237 int err;
1238
1239 err = __sock_create(net, sap->sa_family,
1240 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1241 if (err < 0) {
1242 dprintk("RPC: can't create UDP socket (%d)\n", err);
1243 goto out;
1244 }
1245
1246 switch (sap->sa_family) {
1247 case AF_INET:
1248 err = kernel_bind(sock,
1249 (struct sockaddr *)&rpc_inaddr_loopback,
1250 sizeof(rpc_inaddr_loopback));
1251 break;
1252 case AF_INET6:
1253 err = kernel_bind(sock,
1254 (struct sockaddr *)&rpc_in6addr_loopback,
1255 sizeof(rpc_in6addr_loopback));
1256 break;
1257 default:
1258 err = -EAFNOSUPPORT;
1259 goto out;
1260 }
1261 if (err < 0) {
1262 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1263 goto out_release;
1264 }
1265
1266 err = kernel_connect(sock, sap, salen, 0);
1267 if (err < 0) {
1268 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1269 goto out_release;
1270 }
1271
1272 err = kernel_getsockname(sock, buf);
1273 if (err < 0) {
1274 dprintk("RPC: getsockname failed (%d)\n", err);
1275 goto out_release;
1276 }
1277
1278 err = 0;
1279 if (buf->sa_family == AF_INET6) {
1280 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1281 sin6->sin6_scope_id = 0;
1282 }
1283 dprintk("RPC: %s succeeded\n", __func__);
1284
1285out_release:
1286 sock_release(sock);
1287out:
1288 return err;
1289}
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1300{
1301 switch (family) {
1302 case AF_INET:
1303 if (buflen < sizeof(rpc_inaddr_loopback))
1304 return -EINVAL;
1305 memcpy(buf, &rpc_inaddr_loopback,
1306 sizeof(rpc_inaddr_loopback));
1307 break;
1308 case AF_INET6:
1309 if (buflen < sizeof(rpc_in6addr_loopback))
1310 return -EINVAL;
1311 memcpy(buf, &rpc_in6addr_loopback,
1312 sizeof(rpc_in6addr_loopback));
1313 break;
1314 default:
1315 dprintk("RPC: %s: address family not supported\n",
1316 __func__);
1317 return -EAFNOSUPPORT;
1318 }
1319 dprintk("RPC: %s: succeeded\n", __func__);
1320 return 0;
1321}
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1340{
1341 struct sockaddr_storage address;
1342 struct sockaddr *sap = (struct sockaddr *)&address;
1343 struct rpc_xprt *xprt;
1344 struct net *net;
1345 size_t salen;
1346 int err;
1347
1348 rcu_read_lock();
1349 xprt = rcu_dereference(clnt->cl_xprt);
1350 salen = xprt->addrlen;
1351 memcpy(sap, &xprt->addr, salen);
1352 net = get_net(xprt->xprt_net);
1353 rcu_read_unlock();
1354
1355 rpc_set_port(sap, 0);
1356 err = rpc_sockname(net, sap, salen, buf);
1357 put_net(net);
1358 if (err != 0)
1359
1360 return rpc_anyaddr(sap->sa_family, buf, buflen);
1361 return 0;
1362}
1363EXPORT_SYMBOL_GPL(rpc_localaddr);
1364
1365void
1366rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1367{
1368 struct rpc_xprt *xprt;
1369
1370 rcu_read_lock();
1371 xprt = rcu_dereference(clnt->cl_xprt);
1372 if (xprt->ops->set_buffer_size)
1373 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1374 rcu_read_unlock();
1375}
1376EXPORT_SYMBOL_GPL(rpc_setbufsize);
1377
1378
1379
1380
1381
1382
1383struct net *rpc_net_ns(struct rpc_clnt *clnt)
1384{
1385 struct net *ret;
1386
1387 rcu_read_lock();
1388 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1389 rcu_read_unlock();
1390 return ret;
1391}
1392EXPORT_SYMBOL_GPL(rpc_net_ns);
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403size_t rpc_max_payload(struct rpc_clnt *clnt)
1404{
1405 size_t ret;
1406
1407 rcu_read_lock();
1408 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1409 rcu_read_unlock();
1410 return ret;
1411}
1412EXPORT_SYMBOL_GPL(rpc_max_payload);
1413
1414
1415
1416
1417
1418size_t rpc_max_bc_payload(struct rpc_clnt *clnt)
1419{
1420 struct rpc_xprt *xprt;
1421 size_t ret;
1422
1423 rcu_read_lock();
1424 xprt = rcu_dereference(clnt->cl_xprt);
1425 ret = xprt->ops->bc_maxpayload(xprt);
1426 rcu_read_unlock();
1427 return ret;
1428}
1429EXPORT_SYMBOL_GPL(rpc_max_bc_payload);
1430
1431
1432
1433
1434
1435
1436void rpc_force_rebind(struct rpc_clnt *clnt)
1437{
1438 if (clnt->cl_autobind) {
1439 rcu_read_lock();
1440 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1441 rcu_read_unlock();
1442 }
1443}
1444EXPORT_SYMBOL_GPL(rpc_force_rebind);
1445
1446
1447
1448
1449
1450int
1451rpc_restart_call_prepare(struct rpc_task *task)
1452{
1453 if (RPC_ASSASSINATED(task))
1454 return 0;
1455 task->tk_action = call_start;
1456 task->tk_status = 0;
1457 if (task->tk_ops->rpc_call_prepare != NULL)
1458 task->tk_action = rpc_prepare_task;
1459 return 1;
1460}
1461EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1462
1463
1464
1465
1466
1467int
1468rpc_restart_call(struct rpc_task *task)
1469{
1470 if (RPC_ASSASSINATED(task))
1471 return 0;
1472 task->tk_action = call_start;
1473 task->tk_status = 0;
1474 return 1;
1475}
1476EXPORT_SYMBOL_GPL(rpc_restart_call);
1477
1478const char
1479*rpc_proc_name(const struct rpc_task *task)
1480{
1481 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1482
1483 if (proc) {
1484 if (proc->p_name)
1485 return proc->p_name;
1486 else
1487 return "NULL";
1488 } else
1489 return "no proc";
1490}
1491
1492
1493
1494
1495
1496
1497
1498static void
1499call_start(struct rpc_task *task)
1500{
1501 struct rpc_clnt *clnt = task->tk_client;
1502 int idx = task->tk_msg.rpc_proc->p_statidx;
1503
1504 trace_rpc_request(task);
1505 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1506 clnt->cl_program->name, clnt->cl_vers,
1507 rpc_proc_name(task),
1508 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1509
1510
1511 if (clnt->cl_program->version[clnt->cl_vers])
1512 clnt->cl_program->version[clnt->cl_vers]->counts[idx]++;
1513 clnt->cl_stats->rpccnt++;
1514 task->tk_action = call_reserve;
1515}
1516
1517
1518
1519
1520static void
1521call_reserve(struct rpc_task *task)
1522{
1523 dprint_status(task);
1524
1525 task->tk_status = 0;
1526 task->tk_action = call_reserveresult;
1527 xprt_reserve(task);
1528}
1529
1530static void call_retry_reserve(struct rpc_task *task);
1531
1532
1533
1534
1535static void
1536call_reserveresult(struct rpc_task *task)
1537{
1538 int status = task->tk_status;
1539
1540 dprint_status(task);
1541
1542
1543
1544
1545
1546 task->tk_status = 0;
1547 if (status >= 0) {
1548 if (task->tk_rqstp) {
1549 task->tk_action = call_refresh;
1550 return;
1551 }
1552
1553 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1554 __func__, status);
1555 rpc_exit(task, -EIO);
1556 return;
1557 }
1558
1559
1560
1561
1562
1563 if (task->tk_rqstp) {
1564 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1565 __func__, status);
1566 xprt_release(task);
1567 }
1568
1569 switch (status) {
1570 case -ENOMEM:
1571 rpc_delay(task, HZ >> 2);
1572
1573 case -EAGAIN:
1574 task->tk_action = call_retry_reserve;
1575 return;
1576 case -EIO:
1577 break;
1578 default:
1579 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1580 __func__, status);
1581 break;
1582 }
1583 rpc_exit(task, status);
1584}
1585
1586
1587
1588
1589static void
1590call_retry_reserve(struct rpc_task *task)
1591{
1592 dprint_status(task);
1593
1594 task->tk_status = 0;
1595 task->tk_action = call_reserveresult;
1596 xprt_retry_reserve(task);
1597}
1598
1599
1600
1601
1602static void
1603call_refresh(struct rpc_task *task)
1604{
1605 dprint_status(task);
1606
1607 task->tk_action = call_refreshresult;
1608 task->tk_status = 0;
1609 task->tk_client->cl_stats->rpcauthrefresh++;
1610 rpcauth_refreshcred(task);
1611}
1612
1613
1614
1615
1616static void
1617call_refreshresult(struct rpc_task *task)
1618{
1619 int status = task->tk_status;
1620
1621 dprint_status(task);
1622
1623 task->tk_status = 0;
1624 task->tk_action = call_refresh;
1625 switch (status) {
1626 case 0:
1627 if (rpcauth_uptodatecred(task)) {
1628 task->tk_action = call_allocate;
1629 return;
1630 }
1631
1632
1633
1634
1635 case -ETIMEDOUT:
1636 rpc_delay(task, 3*HZ);
1637
1638 case -EAGAIN:
1639 status = -EACCES;
1640
1641 case -EKEYEXPIRED:
1642 if (!task->tk_cred_retry)
1643 break;
1644 task->tk_cred_retry--;
1645 dprintk("RPC: %5u %s: retry refresh creds\n",
1646 task->tk_pid, __func__);
1647 return;
1648 }
1649 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1650 task->tk_pid, __func__, status);
1651 rpc_exit(task, status);
1652}
1653
1654
1655
1656
1657
1658static void
1659call_allocate(struct rpc_task *task)
1660{
1661 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1662 struct rpc_rqst *req = task->tk_rqstp;
1663 struct rpc_xprt *xprt = req->rq_xprt;
1664 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1665 int status;
1666
1667 dprint_status(task);
1668
1669 task->tk_status = 0;
1670 task->tk_action = call_bind;
1671
1672 if (req->rq_buffer)
1673 return;
1674
1675 if (proc->p_proc != 0) {
1676 BUG_ON(proc->p_arglen == 0);
1677 if (proc->p_decode != NULL)
1678 BUG_ON(proc->p_replen == 0);
1679 }
1680
1681
1682
1683
1684
1685
1686 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1687 req->rq_callsize <<= 2;
1688 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1689 req->rq_rcvsize <<= 2;
1690
1691 status = xprt->ops->buf_alloc(task);
1692 xprt_inject_disconnect(xprt);
1693 if (status == 0)
1694 return;
1695 if (status != -ENOMEM) {
1696 rpc_exit(task, status);
1697 return;
1698 }
1699
1700 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1701
1702 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1703 task->tk_action = call_allocate;
1704 rpc_delay(task, HZ>>4);
1705 return;
1706 }
1707
1708 rpc_exit(task, -ERESTARTSYS);
1709}
1710
1711static inline int
1712rpc_task_need_encode(struct rpc_task *task)
1713{
1714 return task->tk_rqstp->rq_snd_buf.len == 0;
1715}
1716
1717static inline void
1718rpc_task_force_reencode(struct rpc_task *task)
1719{
1720 task->tk_rqstp->rq_snd_buf.len = 0;
1721 task->tk_rqstp->rq_bytes_sent = 0;
1722}
1723
1724
1725
1726
1727static void
1728rpc_xdr_encode(struct rpc_task *task)
1729{
1730 struct rpc_rqst *req = task->tk_rqstp;
1731 kxdreproc_t encode;
1732 __be32 *p;
1733
1734 dprint_status(task);
1735
1736 xdr_buf_init(&req->rq_snd_buf,
1737 req->rq_buffer,
1738 req->rq_callsize);
1739 xdr_buf_init(&req->rq_rcv_buf,
1740 req->rq_rbuffer,
1741 req->rq_rcvsize);
1742
1743 p = rpc_encode_header(task);
1744 if (p == NULL) {
1745 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1746 rpc_exit(task, -EIO);
1747 return;
1748 }
1749
1750 encode = task->tk_msg.rpc_proc->p_encode;
1751 if (encode == NULL)
1752 return;
1753
1754 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1755 task->tk_msg.rpc_argp);
1756}
1757
1758
1759
1760
1761static void
1762call_bind(struct rpc_task *task)
1763{
1764 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1765
1766 dprint_status(task);
1767
1768 task->tk_action = call_connect;
1769 if (!xprt_bound(xprt)) {
1770 task->tk_action = call_bind_status;
1771 task->tk_timeout = xprt->bind_timeout;
1772 xprt->ops->rpcbind(task);
1773 }
1774}
1775
1776
1777
1778
1779static void
1780call_bind_status(struct rpc_task *task)
1781{
1782 int status = -EIO;
1783
1784 if (task->tk_status >= 0) {
1785 dprint_status(task);
1786 task->tk_status = 0;
1787 task->tk_action = call_connect;
1788 return;
1789 }
1790
1791 trace_rpc_bind_status(task);
1792 switch (task->tk_status) {
1793 case -ENOMEM:
1794 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1795 rpc_delay(task, HZ >> 2);
1796 goto retry_timeout;
1797 case -EACCES:
1798 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1799 "unavailable\n", task->tk_pid);
1800
1801 if (task->tk_msg.rpc_proc->p_proc == 0) {
1802 status = -EOPNOTSUPP;
1803 break;
1804 }
1805 if (task->tk_rebind_retry == 0)
1806 break;
1807 task->tk_rebind_retry--;
1808 rpc_delay(task, 3*HZ);
1809 goto retry_timeout;
1810 case -ETIMEDOUT:
1811 dprintk("RPC: %5u rpcbind request timed out\n",
1812 task->tk_pid);
1813 goto retry_timeout;
1814 case -EPFNOSUPPORT:
1815
1816 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1817 task->tk_pid);
1818 break;
1819 case -EPROTONOSUPPORT:
1820 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1821 task->tk_pid);
1822 goto retry_timeout;
1823 case -ECONNREFUSED:
1824 case -ECONNRESET:
1825 case -ECONNABORTED:
1826 case -ENOTCONN:
1827 case -EHOSTDOWN:
1828 case -ENETDOWN:
1829 case -EHOSTUNREACH:
1830 case -ENETUNREACH:
1831 case -ENOBUFS:
1832 case -EPIPE:
1833 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1834 task->tk_pid, task->tk_status);
1835 if (!RPC_IS_SOFTCONN(task)) {
1836 rpc_delay(task, 5*HZ);
1837 goto retry_timeout;
1838 }
1839 status = task->tk_status;
1840 break;
1841 default:
1842 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1843 task->tk_pid, -task->tk_status);
1844 }
1845
1846 rpc_exit(task, status);
1847 return;
1848
1849retry_timeout:
1850 task->tk_status = 0;
1851 task->tk_action = call_timeout;
1852}
1853
1854
1855
1856
1857static void
1858call_connect(struct rpc_task *task)
1859{
1860 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1861
1862 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1863 task->tk_pid, xprt,
1864 (xprt_connected(xprt) ? "is" : "is not"));
1865
1866 task->tk_action = call_transmit;
1867 if (!xprt_connected(xprt)) {
1868 task->tk_action = call_connect_status;
1869 if (task->tk_status < 0)
1870 return;
1871 if (task->tk_flags & RPC_TASK_NOCONNECT) {
1872 rpc_exit(task, -ENOTCONN);
1873 return;
1874 }
1875 xprt_connect(task);
1876 }
1877}
1878
1879
1880
1881
1882static void
1883call_connect_status(struct rpc_task *task)
1884{
1885 struct rpc_clnt *clnt = task->tk_client;
1886 int status = task->tk_status;
1887
1888 dprint_status(task);
1889
1890 trace_rpc_connect_status(task);
1891 task->tk_status = 0;
1892 switch (status) {
1893 case -ECONNREFUSED:
1894
1895 if (RPC_IS_SOFTCONN(task))
1896 break;
1897 if (clnt->cl_autobind) {
1898 rpc_force_rebind(clnt);
1899 task->tk_action = call_bind;
1900 return;
1901 }
1902
1903 case -ECONNRESET:
1904 case -ECONNABORTED:
1905 case -ENETDOWN:
1906 case -ENETUNREACH:
1907 case -EHOSTUNREACH:
1908 case -EADDRINUSE:
1909 case -ENOBUFS:
1910 case -EPIPE:
1911 xprt_conditional_disconnect(task->tk_rqstp->rq_xprt,
1912 task->tk_rqstp->rq_connect_cookie);
1913 if (RPC_IS_SOFTCONN(task))
1914 break;
1915
1916 rpc_delay(task, 3*HZ);
1917
1918 case -EAGAIN:
1919
1920 case -ETIMEDOUT:
1921 task->tk_action = call_timeout;
1922 return;
1923 case 0:
1924 clnt->cl_stats->netreconn++;
1925 task->tk_action = call_transmit;
1926 return;
1927 }
1928 rpc_exit(task, status);
1929}
1930
1931
1932
1933
1934static void
1935call_transmit(struct rpc_task *task)
1936{
1937 int is_retrans = RPC_WAS_SENT(task);
1938
1939 dprint_status(task);
1940
1941 task->tk_action = call_status;
1942 if (task->tk_status < 0)
1943 return;
1944 if (!xprt_prepare_transmit(task))
1945 return;
1946 task->tk_action = call_transmit_status;
1947
1948 if (rpc_task_need_encode(task)) {
1949 rpc_xdr_encode(task);
1950
1951 if (task->tk_status != 0) {
1952
1953 if (task->tk_status == -EAGAIN)
1954 rpc_delay(task, HZ >> 4);
1955 else
1956 rpc_exit(task, task->tk_status);
1957 return;
1958 }
1959 }
1960 xprt_transmit(task);
1961 if (task->tk_status < 0)
1962 return;
1963 if (is_retrans)
1964 task->tk_client->cl_stats->rpcretrans++;
1965
1966
1967
1968
1969 call_transmit_status(task);
1970 if (rpc_reply_expected(task))
1971 return;
1972 task->tk_action = rpc_exit_task;
1973 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1974}
1975
1976
1977
1978
1979static void
1980call_transmit_status(struct rpc_task *task)
1981{
1982 task->tk_action = call_status;
1983
1984
1985
1986
1987
1988 if (task->tk_status == 0) {
1989 xprt_end_transmit(task);
1990 rpc_task_force_reencode(task);
1991 return;
1992 }
1993
1994 switch (task->tk_status) {
1995 case -EAGAIN:
1996 case -ENOBUFS:
1997 break;
1998 default:
1999 dprint_status(task);
2000 xprt_end_transmit(task);
2001 rpc_task_force_reencode(task);
2002 break;
2003
2004
2005
2006
2007
2008
2009 case -ECONNREFUSED:
2010 case -EHOSTDOWN:
2011 case -ENETDOWN:
2012 case -EHOSTUNREACH:
2013 case -ENETUNREACH:
2014 case -EPERM:
2015 if (RPC_IS_SOFTCONN(task)) {
2016 xprt_end_transmit(task);
2017 if (!task->tk_msg.rpc_proc->p_proc)
2018 trace_xprt_ping(task->tk_xprt,
2019 task->tk_status);
2020 rpc_exit(task, task->tk_status);
2021 break;
2022 }
2023
2024 case -ECONNRESET:
2025 case -ECONNABORTED:
2026 case -EADDRINUSE:
2027 case -ENOTCONN:
2028 case -EPIPE:
2029 rpc_task_force_reencode(task);
2030 }
2031}
2032
2033#if defined(CONFIG_SUNRPC_BACKCHANNEL)
2034
2035
2036
2037
2038static void
2039call_bc_transmit(struct rpc_task *task)
2040{
2041 struct rpc_rqst *req = task->tk_rqstp;
2042
2043 if (!xprt_prepare_transmit(task))
2044 goto out_retry;
2045
2046 if (task->tk_status < 0) {
2047 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2048 "error: %d\n", task->tk_status);
2049 goto out_done;
2050 }
2051 if (req->rq_connect_cookie != req->rq_xprt->connect_cookie)
2052 req->rq_bytes_sent = 0;
2053
2054 xprt_transmit(task);
2055
2056 if (task->tk_status == -EAGAIN)
2057 goto out_nospace;
2058
2059 xprt_end_transmit(task);
2060 dprint_status(task);
2061 switch (task->tk_status) {
2062 case 0:
2063
2064 case -ENETDOWN:
2065 case -EHOSTDOWN:
2066 case -EHOSTUNREACH:
2067 case -ENETUNREACH:
2068 case -ECONNRESET:
2069 case -ECONNREFUSED:
2070 case -EADDRINUSE:
2071 case -ENOTCONN:
2072 case -EPIPE:
2073 break;
2074 case -ETIMEDOUT:
2075
2076
2077
2078
2079
2080
2081
2082 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2083 "error: %d\n", task->tk_status);
2084 xprt_conditional_disconnect(req->rq_xprt,
2085 req->rq_connect_cookie);
2086 break;
2087 default:
2088
2089
2090
2091
2092 WARN_ON_ONCE(task->tk_status == -EAGAIN);
2093 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2094 "error: %d\n", task->tk_status);
2095 break;
2096 }
2097 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
2098out_done:
2099 task->tk_action = rpc_exit_task;
2100 return;
2101out_nospace:
2102 req->rq_connect_cookie = req->rq_xprt->connect_cookie;
2103out_retry:
2104 task->tk_status = 0;
2105}
2106#endif
2107
2108
2109
2110
2111static void
2112call_status(struct rpc_task *task)
2113{
2114 struct rpc_clnt *clnt = task->tk_client;
2115 struct rpc_rqst *req = task->tk_rqstp;
2116 int status;
2117
2118 if (!task->tk_msg.rpc_proc->p_proc)
2119 trace_xprt_ping(task->tk_xprt, task->tk_status);
2120
2121 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
2122 task->tk_status = req->rq_reply_bytes_recvd;
2123
2124 dprint_status(task);
2125
2126 status = task->tk_status;
2127 if (status >= 0) {
2128 task->tk_action = call_decode;
2129 return;
2130 }
2131
2132 trace_rpc_call_status(task);
2133 task->tk_status = 0;
2134 switch(status) {
2135 case -EHOSTDOWN:
2136 case -ENETDOWN:
2137 case -EHOSTUNREACH:
2138 case -ENETUNREACH:
2139 case -EPERM:
2140 if (RPC_IS_SOFTCONN(task)) {
2141 rpc_exit(task, status);
2142 break;
2143 }
2144
2145
2146
2147
2148 rpc_delay(task, 3*HZ);
2149
2150 case -ETIMEDOUT:
2151 task->tk_action = call_timeout;
2152 break;
2153 case -ECONNREFUSED:
2154 case -ECONNRESET:
2155 case -ECONNABORTED:
2156 rpc_force_rebind(clnt);
2157
2158 case -EADDRINUSE:
2159 rpc_delay(task, 3*HZ);
2160
2161 case -EPIPE:
2162 case -ENOTCONN:
2163 task->tk_action = call_bind;
2164 break;
2165 case -ENOBUFS:
2166 rpc_delay(task, HZ>>2);
2167
2168 case -EAGAIN:
2169 task->tk_action = call_transmit;
2170 break;
2171 case -EIO:
2172
2173 rpc_exit(task, status);
2174 break;
2175 default:
2176 if (clnt->cl_chatty)
2177 printk("%s: RPC call returned error %d\n",
2178 clnt->cl_program->name, -status);
2179 rpc_exit(task, status);
2180 }
2181}
2182
2183
2184
2185
2186
2187
2188static void
2189call_timeout(struct rpc_task *task)
2190{
2191 struct rpc_clnt *clnt = task->tk_client;
2192
2193 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
2194 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
2195 goto retry;
2196 }
2197
2198 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
2199 task->tk_timeouts++;
2200
2201 if (RPC_IS_SOFTCONN(task)) {
2202 rpc_exit(task, -ETIMEDOUT);
2203 return;
2204 }
2205 if (RPC_IS_SOFT(task)) {
2206 if (clnt->cl_chatty) {
2207 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
2208 clnt->cl_program->name,
2209 task->tk_xprt->servername);
2210 }
2211 if (task->tk_flags & RPC_TASK_TIMEOUT)
2212 rpc_exit(task, -ETIMEDOUT);
2213 else
2214 rpc_exit(task, -EIO);
2215 return;
2216 }
2217
2218 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
2219 task->tk_flags |= RPC_CALL_MAJORSEEN;
2220 if (clnt->cl_chatty) {
2221 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
2222 clnt->cl_program->name,
2223 task->tk_xprt->servername);
2224 }
2225 }
2226 rpc_force_rebind(clnt);
2227
2228
2229
2230
2231 rpcauth_invalcred(task);
2232
2233retry:
2234 task->tk_action = call_bind;
2235 task->tk_status = 0;
2236}
2237
2238
2239
2240
2241static void
2242call_decode(struct rpc_task *task)
2243{
2244 struct rpc_clnt *clnt = task->tk_client;
2245 struct rpc_rqst *req = task->tk_rqstp;
2246 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
2247 __be32 *p;
2248
2249 dprint_status(task);
2250
2251 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
2252 if (clnt->cl_chatty) {
2253 printk(KERN_NOTICE "%s: server %s OK\n",
2254 clnt->cl_program->name,
2255 task->tk_xprt->servername);
2256 }
2257 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
2258 }
2259
2260
2261
2262
2263
2264 smp_rmb();
2265 req->rq_rcv_buf.len = req->rq_private_buf.len;
2266
2267
2268 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2269 sizeof(req->rq_rcv_buf)) != 0);
2270
2271 if (req->rq_rcv_buf.len < 12) {
2272 if (!RPC_IS_SOFT(task)) {
2273 task->tk_action = call_bind;
2274 goto out_retry;
2275 }
2276 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
2277 clnt->cl_program->name, task->tk_status);
2278 task->tk_action = call_timeout;
2279 goto out_retry;
2280 }
2281
2282 p = rpc_verify_header(task);
2283 if (IS_ERR(p)) {
2284 if (p == ERR_PTR(-EAGAIN))
2285 goto out_retry;
2286 return;
2287 }
2288
2289 task->tk_action = rpc_exit_task;
2290
2291 if (decode) {
2292 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
2293 task->tk_msg.rpc_resp);
2294 }
2295 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
2296 task->tk_status);
2297 return;
2298out_retry:
2299 task->tk_status = 0;
2300
2301 if (task->tk_rqstp == req) {
2302 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
2303 if (task->tk_client->cl_discrtry)
2304 xprt_conditional_disconnect(req->rq_xprt,
2305 req->rq_connect_cookie);
2306 }
2307}
2308
2309static __be32 *
2310rpc_encode_header(struct rpc_task *task)
2311{
2312 struct rpc_clnt *clnt = task->tk_client;
2313 struct rpc_rqst *req = task->tk_rqstp;
2314 __be32 *p = req->rq_svec[0].iov_base;
2315
2316
2317
2318 p = xprt_skip_transport_header(req->rq_xprt, p);
2319 *p++ = req->rq_xid;
2320 *p++ = htonl(RPC_CALL);
2321 *p++ = htonl(RPC_VERSION);
2322 *p++ = htonl(clnt->cl_prog);
2323 *p++ = htonl(clnt->cl_vers);
2324 *p++ = htonl(task->tk_msg.rpc_proc->p_proc);
2325 p = rpcauth_marshcred(task, p);
2326 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2327 return p;
2328}
2329
2330static __be32 *
2331rpc_verify_header(struct rpc_task *task)
2332{
2333 struct rpc_clnt *clnt = task->tk_client;
2334 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2335 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2336 __be32 *p = iov->iov_base;
2337 u32 n;
2338 int error = -EACCES;
2339
2340 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2341
2342
2343
2344
2345
2346 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2347 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2348 task->tk_rqstp->rq_rcv_buf.len);
2349 error = -EIO;
2350 goto out_err;
2351 }
2352 if ((len -= 3) < 0)
2353 goto out_overflow;
2354
2355 p += 1;
2356 if ((n = ntohl(*p++)) != RPC_REPLY) {
2357 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2358 task->tk_pid, __func__, n);
2359 error = -EIO;
2360 goto out_garbage;
2361 }
2362
2363 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2364 if (--len < 0)
2365 goto out_overflow;
2366 switch ((n = ntohl(*p++))) {
2367 case RPC_AUTH_ERROR:
2368 break;
2369 case RPC_MISMATCH:
2370 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2371 task->tk_pid, __func__);
2372 error = -EPROTONOSUPPORT;
2373 goto out_err;
2374 default:
2375 dprintk("RPC: %5u %s: RPC call rejected, "
2376 "unknown error: %x\n",
2377 task->tk_pid, __func__, n);
2378 error = -EIO;
2379 goto out_err;
2380 }
2381 if (--len < 0)
2382 goto out_overflow;
2383 switch ((n = ntohl(*p++))) {
2384 case RPC_AUTH_REJECTEDCRED:
2385 case RPC_AUTH_REJECTEDVERF:
2386 case RPCSEC_GSS_CREDPROBLEM:
2387 case RPCSEC_GSS_CTXPROBLEM:
2388 if (!task->tk_cred_retry)
2389 break;
2390 task->tk_cred_retry--;
2391 dprintk("RPC: %5u %s: retry stale creds\n",
2392 task->tk_pid, __func__);
2393 rpcauth_invalcred(task);
2394
2395 xprt_release(task);
2396 task->tk_action = call_reserve;
2397 goto out_retry;
2398 case RPC_AUTH_BADCRED:
2399 case RPC_AUTH_BADVERF:
2400
2401 if (!task->tk_garb_retry)
2402 break;
2403 task->tk_garb_retry--;
2404 dprintk("RPC: %5u %s: retry garbled creds\n",
2405 task->tk_pid, __func__);
2406 task->tk_action = call_bind;
2407 goto out_retry;
2408 case RPC_AUTH_TOOWEAK:
2409 printk(KERN_NOTICE "RPC: server %s requires stronger "
2410 "authentication.\n",
2411 task->tk_xprt->servername);
2412 break;
2413 default:
2414 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2415 task->tk_pid, __func__, n);
2416 error = -EIO;
2417 }
2418 dprintk("RPC: %5u %s: call rejected %d\n",
2419 task->tk_pid, __func__, n);
2420 goto out_err;
2421 }
2422 p = rpcauth_checkverf(task, p);
2423 if (IS_ERR(p)) {
2424 error = PTR_ERR(p);
2425 dprintk("RPC: %5u %s: auth check failed with %d\n",
2426 task->tk_pid, __func__, error);
2427 goto out_garbage;
2428 }
2429 len = p - (__be32 *)iov->iov_base - 1;
2430 if (len < 0)
2431 goto out_overflow;
2432 switch ((n = ntohl(*p++))) {
2433 case RPC_SUCCESS:
2434 return p;
2435 case RPC_PROG_UNAVAIL:
2436 dprintk("RPC: %5u %s: program %u is unsupported "
2437 "by server %s\n", task->tk_pid, __func__,
2438 (unsigned int)clnt->cl_prog,
2439 task->tk_xprt->servername);
2440 error = -EPFNOSUPPORT;
2441 goto out_err;
2442 case RPC_PROG_MISMATCH:
2443 dprintk("RPC: %5u %s: program %u, version %u unsupported "
2444 "by server %s\n", task->tk_pid, __func__,
2445 (unsigned int)clnt->cl_prog,
2446 (unsigned int)clnt->cl_vers,
2447 task->tk_xprt->servername);
2448 error = -EPROTONOSUPPORT;
2449 goto out_err;
2450 case RPC_PROC_UNAVAIL:
2451 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
2452 "version %u on server %s\n",
2453 task->tk_pid, __func__,
2454 rpc_proc_name(task),
2455 clnt->cl_prog, clnt->cl_vers,
2456 task->tk_xprt->servername);
2457 error = -EOPNOTSUPP;
2458 goto out_err;
2459 case RPC_GARBAGE_ARGS:
2460 dprintk("RPC: %5u %s: server saw garbage\n",
2461 task->tk_pid, __func__);
2462 break;
2463 default:
2464 dprintk("RPC: %5u %s: server accept status: %x\n",
2465 task->tk_pid, __func__, n);
2466
2467 }
2468
2469out_garbage:
2470 clnt->cl_stats->rpcgarbage++;
2471 if (task->tk_garb_retry) {
2472 task->tk_garb_retry--;
2473 dprintk("RPC: %5u %s: retrying\n",
2474 task->tk_pid, __func__);
2475 task->tk_action = call_bind;
2476out_retry:
2477 return ERR_PTR(-EAGAIN);
2478 }
2479out_err:
2480 rpc_exit(task, error);
2481 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2482 __func__, error);
2483 return ERR_PTR(error);
2484out_overflow:
2485 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2486 __func__);
2487 goto out_garbage;
2488}
2489
2490static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2491 const void *obj)
2492{
2493}
2494
2495static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2496 void *obj)
2497{
2498 return 0;
2499}
2500
2501static const struct rpc_procinfo rpcproc_null = {
2502 .p_encode = rpcproc_encode_null,
2503 .p_decode = rpcproc_decode_null,
2504};
2505
2506static int rpc_ping(struct rpc_clnt *clnt)
2507{
2508 struct rpc_message msg = {
2509 .rpc_proc = &rpcproc_null,
2510 };
2511 int err;
2512 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2513 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2514 put_rpccred(msg.rpc_cred);
2515 return err;
2516}
2517
2518static
2519struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt,
2520 struct rpc_xprt *xprt, struct rpc_cred *cred, int flags,
2521 const struct rpc_call_ops *ops, void *data)
2522{
2523 struct rpc_message msg = {
2524 .rpc_proc = &rpcproc_null,
2525 .rpc_cred = cred,
2526 };
2527 struct rpc_task_setup task_setup_data = {
2528 .rpc_client = clnt,
2529 .rpc_xprt = xprt,
2530 .rpc_message = &msg,
2531 .callback_ops = (ops != NULL) ? ops : &rpc_default_ops,
2532 .callback_data = data,
2533 .flags = flags,
2534 };
2535
2536 return rpc_run_task(&task_setup_data);
2537}
2538
2539struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2540{
2541 return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL);
2542}
2543EXPORT_SYMBOL_GPL(rpc_call_null);
2544
2545struct rpc_cb_add_xprt_calldata {
2546 struct rpc_xprt_switch *xps;
2547 struct rpc_xprt *xprt;
2548};
2549
2550static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata)
2551{
2552 struct rpc_cb_add_xprt_calldata *data = calldata;
2553
2554 if (task->tk_status == 0)
2555 rpc_xprt_switch_add_xprt(data->xps, data->xprt);
2556}
2557
2558static void rpc_cb_add_xprt_release(void *calldata)
2559{
2560 struct rpc_cb_add_xprt_calldata *data = calldata;
2561
2562 xprt_put(data->xprt);
2563 xprt_switch_put(data->xps);
2564 kfree(data);
2565}
2566
2567static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = {
2568 .rpc_call_done = rpc_cb_add_xprt_done,
2569 .rpc_release = rpc_cb_add_xprt_release,
2570};
2571
2572
2573
2574
2575
2576
2577
2578
2579int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
2580 struct rpc_xprt_switch *xps, struct rpc_xprt *xprt,
2581 void *dummy)
2582{
2583 struct rpc_cb_add_xprt_calldata *data;
2584 struct rpc_cred *cred;
2585 struct rpc_task *task;
2586
2587 data = kmalloc(sizeof(*data), GFP_NOFS);
2588 if (!data)
2589 return -ENOMEM;
2590 data->xps = xprt_switch_get(xps);
2591 data->xprt = xprt_get(xprt);
2592
2593 cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2594 task = rpc_call_null_helper(clnt, xprt, cred,
2595 RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC,
2596 &rpc_cb_add_xprt_call_ops, data);
2597 put_rpccred(cred);
2598 if (IS_ERR(task))
2599 return PTR_ERR(task);
2600 rpc_put_task(task);
2601 return 1;
2602}
2603EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt);
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt,
2624 struct rpc_xprt_switch *xps,
2625 struct rpc_xprt *xprt,
2626 void *data)
2627{
2628 struct rpc_cred *cred;
2629 struct rpc_task *task;
2630 struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data;
2631 int status = -EADDRINUSE;
2632
2633 xprt = xprt_get(xprt);
2634 xprt_switch_get(xps);
2635
2636 if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr))
2637 goto out_err;
2638
2639
2640 cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2641 task = rpc_call_null_helper(clnt, xprt, cred,
2642 RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
2643 NULL, NULL);
2644 put_rpccred(cred);
2645 if (IS_ERR(task)) {
2646 status = PTR_ERR(task);
2647 goto out_err;
2648 }
2649 status = task->tk_status;
2650 rpc_put_task(task);
2651
2652 if (status < 0)
2653 goto out_err;
2654
2655
2656 xtest->add_xprt_test(clnt, xprt, xtest->data);
2657
2658
2659 return 1;
2660out_err:
2661 xprt_put(xprt);
2662 xprt_switch_put(xps);
2663 pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n",
2664 status, xprt->address_strings[RPC_DISPLAY_ADDR]);
2665 return status;
2666}
2667EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt);
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
2683 struct xprt_create *xprtargs,
2684 int (*setup)(struct rpc_clnt *,
2685 struct rpc_xprt_switch *,
2686 struct rpc_xprt *,
2687 void *),
2688 void *data)
2689{
2690 struct rpc_xprt_switch *xps;
2691 struct rpc_xprt *xprt;
2692 unsigned long connect_timeout;
2693 unsigned long reconnect_timeout;
2694 unsigned char resvport;
2695 int ret = 0;
2696
2697 rcu_read_lock();
2698 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2699 xprt = xprt_iter_xprt(&clnt->cl_xpi);
2700 if (xps == NULL || xprt == NULL) {
2701 rcu_read_unlock();
2702 return -EAGAIN;
2703 }
2704 resvport = xprt->resvport;
2705 connect_timeout = xprt->connect_timeout;
2706 reconnect_timeout = xprt->max_reconnect_timeout;
2707 rcu_read_unlock();
2708
2709 xprt = xprt_create_transport(xprtargs);
2710 if (IS_ERR(xprt)) {
2711 ret = PTR_ERR(xprt);
2712 goto out_put_switch;
2713 }
2714 xprt->resvport = resvport;
2715 if (xprt->ops->set_connect_timeout != NULL)
2716 xprt->ops->set_connect_timeout(xprt,
2717 connect_timeout,
2718 reconnect_timeout);
2719
2720 rpc_xprt_switch_set_roundrobin(xps);
2721 if (setup) {
2722 ret = setup(clnt, xps, xprt, data);
2723 if (ret != 0)
2724 goto out_put_xprt;
2725 }
2726 rpc_xprt_switch_add_xprt(xps, xprt);
2727out_put_xprt:
2728 xprt_put(xprt);
2729out_put_switch:
2730 xprt_switch_put(xps);
2731 return ret;
2732}
2733EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt);
2734
2735struct connect_timeout_data {
2736 unsigned long connect_timeout;
2737 unsigned long reconnect_timeout;
2738};
2739
2740static int
2741rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt,
2742 struct rpc_xprt *xprt,
2743 void *data)
2744{
2745 struct connect_timeout_data *timeo = data;
2746
2747 if (xprt->ops->set_connect_timeout)
2748 xprt->ops->set_connect_timeout(xprt,
2749 timeo->connect_timeout,
2750 timeo->reconnect_timeout);
2751 return 0;
2752}
2753
2754void
2755rpc_set_connect_timeout(struct rpc_clnt *clnt,
2756 unsigned long connect_timeout,
2757 unsigned long reconnect_timeout)
2758{
2759 struct connect_timeout_data timeout = {
2760 .connect_timeout = connect_timeout,
2761 .reconnect_timeout = reconnect_timeout,
2762 };
2763 rpc_clnt_iterate_for_each_xprt(clnt,
2764 rpc_xprt_set_connect_timeout,
2765 &timeout);
2766}
2767EXPORT_SYMBOL_GPL(rpc_set_connect_timeout);
2768
2769void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt)
2770{
2771 rcu_read_lock();
2772 xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2773 rcu_read_unlock();
2774}
2775EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put);
2776
2777void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
2778{
2779 rcu_read_lock();
2780 rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch),
2781 xprt);
2782 rcu_read_unlock();
2783}
2784EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt);
2785
2786bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
2787 const struct sockaddr *sap)
2788{
2789 struct rpc_xprt_switch *xps;
2790 bool ret;
2791
2792 rcu_read_lock();
2793 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
2794 ret = rpc_xprt_switch_has_addr(xps, sap);
2795 rcu_read_unlock();
2796 return ret;
2797}
2798EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr);
2799
2800#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2801static void rpc_show_header(void)
2802{
2803 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2804 "-timeout ---ops--\n");
2805}
2806
2807static void rpc_show_task(const struct rpc_clnt *clnt,
2808 const struct rpc_task *task)
2809{
2810 const char *rpc_waitq = "none";
2811
2812 if (RPC_IS_QUEUED(task))
2813 rpc_waitq = rpc_qname(task->tk_waitqueue);
2814
2815 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2816 task->tk_pid, task->tk_flags, task->tk_status,
2817 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2818 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
2819 task->tk_action, rpc_waitq);
2820}
2821
2822void rpc_show_tasks(struct net *net)
2823{
2824 struct rpc_clnt *clnt;
2825 struct rpc_task *task;
2826 int header = 0;
2827 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2828
2829 spin_lock(&sn->rpc_client_lock);
2830 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2831 spin_lock(&clnt->cl_lock);
2832 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2833 if (!header) {
2834 rpc_show_header();
2835 header++;
2836 }
2837 rpc_show_task(clnt, task);
2838 }
2839 spin_unlock(&clnt->cl_lock);
2840 }
2841 spin_unlock(&sn->rpc_client_lock);
2842}
2843#endif
2844
2845#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2846static int
2847rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt,
2848 struct rpc_xprt *xprt,
2849 void *dummy)
2850{
2851 return xprt_enable_swap(xprt);
2852}
2853
2854int
2855rpc_clnt_swap_activate(struct rpc_clnt *clnt)
2856{
2857 if (atomic_inc_return(&clnt->cl_swapper) == 1)
2858 return rpc_clnt_iterate_for_each_xprt(clnt,
2859 rpc_clnt_swap_activate_callback, NULL);
2860 return 0;
2861}
2862EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
2863
2864static int
2865rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt,
2866 struct rpc_xprt *xprt,
2867 void *dummy)
2868{
2869 xprt_disable_swap(xprt);
2870 return 0;
2871}
2872
2873void
2874rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
2875{
2876 if (atomic_dec_if_positive(&clnt->cl_swapper) == 0)
2877 rpc_clnt_iterate_for_each_xprt(clnt,
2878 rpc_clnt_swap_deactivate_callback, NULL);
2879}
2880EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
2881#endif
2882