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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 xprt_request_init(task);
1550 task->tk_action = call_refresh;
1551 return;
1552 }
1553
1554 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1555 __func__, status);
1556 rpc_exit(task, -EIO);
1557 return;
1558 }
1559
1560
1561
1562
1563
1564 if (task->tk_rqstp) {
1565 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1566 __func__, status);
1567 xprt_release(task);
1568 }
1569
1570 switch (status) {
1571 case -ENOMEM:
1572 rpc_delay(task, HZ >> 2);
1573
1574 case -EAGAIN:
1575 task->tk_action = call_retry_reserve;
1576 return;
1577 case -EIO:
1578 break;
1579 default:
1580 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1581 __func__, status);
1582 break;
1583 }
1584 rpc_exit(task, status);
1585}
1586
1587
1588
1589
1590static void
1591call_retry_reserve(struct rpc_task *task)
1592{
1593 dprint_status(task);
1594
1595 task->tk_status = 0;
1596 task->tk_action = call_reserveresult;
1597 xprt_retry_reserve(task);
1598}
1599
1600
1601
1602
1603static void
1604call_refresh(struct rpc_task *task)
1605{
1606 dprint_status(task);
1607
1608 task->tk_action = call_refreshresult;
1609 task->tk_status = 0;
1610 task->tk_client->cl_stats->rpcauthrefresh++;
1611 rpcauth_refreshcred(task);
1612}
1613
1614
1615
1616
1617static void
1618call_refreshresult(struct rpc_task *task)
1619{
1620 int status = task->tk_status;
1621
1622 dprint_status(task);
1623
1624 task->tk_status = 0;
1625 task->tk_action = call_refresh;
1626 switch (status) {
1627 case 0:
1628 if (rpcauth_uptodatecred(task)) {
1629 task->tk_action = call_allocate;
1630 return;
1631 }
1632
1633
1634
1635
1636 case -ETIMEDOUT:
1637 rpc_delay(task, 3*HZ);
1638
1639 case -EAGAIN:
1640 status = -EACCES;
1641
1642 case -EKEYEXPIRED:
1643 if (!task->tk_cred_retry)
1644 break;
1645 task->tk_cred_retry--;
1646 dprintk("RPC: %5u %s: retry refresh creds\n",
1647 task->tk_pid, __func__);
1648 return;
1649 }
1650 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1651 task->tk_pid, __func__, status);
1652 rpc_exit(task, status);
1653}
1654
1655
1656
1657
1658
1659static void
1660call_allocate(struct rpc_task *task)
1661{
1662 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1663 struct rpc_rqst *req = task->tk_rqstp;
1664 struct rpc_xprt *xprt = req->rq_xprt;
1665 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1666 int status;
1667
1668 dprint_status(task);
1669
1670 task->tk_status = 0;
1671 task->tk_action = call_bind;
1672
1673 if (req->rq_buffer)
1674 return;
1675
1676 if (proc->p_proc != 0) {
1677 BUG_ON(proc->p_arglen == 0);
1678 if (proc->p_decode != NULL)
1679 BUG_ON(proc->p_replen == 0);
1680 }
1681
1682
1683
1684
1685
1686
1687 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1688 req->rq_callsize <<= 2;
1689 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1690 req->rq_rcvsize <<= 2;
1691
1692 status = xprt->ops->buf_alloc(task);
1693 xprt_inject_disconnect(xprt);
1694 if (status == 0)
1695 return;
1696 if (status != -ENOMEM) {
1697 rpc_exit(task, status);
1698 return;
1699 }
1700
1701 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1702
1703 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1704 task->tk_action = call_allocate;
1705 rpc_delay(task, HZ>>4);
1706 return;
1707 }
1708
1709 rpc_exit(task, -ERESTARTSYS);
1710}
1711
1712static inline int
1713rpc_task_need_encode(struct rpc_task *task)
1714{
1715 return task->tk_rqstp->rq_snd_buf.len == 0;
1716}
1717
1718static inline void
1719rpc_task_force_reencode(struct rpc_task *task)
1720{
1721 task->tk_rqstp->rq_snd_buf.len = 0;
1722 task->tk_rqstp->rq_bytes_sent = 0;
1723}
1724
1725
1726
1727
1728static void
1729rpc_xdr_encode(struct rpc_task *task)
1730{
1731 struct rpc_rqst *req = task->tk_rqstp;
1732 kxdreproc_t encode;
1733 __be32 *p;
1734
1735 dprint_status(task);
1736
1737 xdr_buf_init(&req->rq_snd_buf,
1738 req->rq_buffer,
1739 req->rq_callsize);
1740 xdr_buf_init(&req->rq_rcv_buf,
1741 req->rq_rbuffer,
1742 req->rq_rcvsize);
1743
1744 p = rpc_encode_header(task);
1745 if (p == NULL) {
1746 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1747 rpc_exit(task, -EIO);
1748 return;
1749 }
1750
1751 encode = task->tk_msg.rpc_proc->p_encode;
1752 if (encode == NULL)
1753 return;
1754
1755 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1756 task->tk_msg.rpc_argp);
1757}
1758
1759
1760
1761
1762static void
1763call_bind(struct rpc_task *task)
1764{
1765 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1766
1767 dprint_status(task);
1768
1769 task->tk_action = call_connect;
1770 if (!xprt_bound(xprt)) {
1771 task->tk_action = call_bind_status;
1772 task->tk_timeout = xprt->bind_timeout;
1773 xprt->ops->rpcbind(task);
1774 }
1775}
1776
1777
1778
1779
1780static void
1781call_bind_status(struct rpc_task *task)
1782{
1783 int status = -EIO;
1784
1785 if (task->tk_status >= 0) {
1786 dprint_status(task);
1787 task->tk_status = 0;
1788 task->tk_action = call_connect;
1789 return;
1790 }
1791
1792 trace_rpc_bind_status(task);
1793 switch (task->tk_status) {
1794 case -ENOMEM:
1795 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1796 rpc_delay(task, HZ >> 2);
1797 goto retry_timeout;
1798 case -EACCES:
1799 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1800 "unavailable\n", task->tk_pid);
1801
1802 if (task->tk_msg.rpc_proc->p_proc == 0) {
1803 status = -EOPNOTSUPP;
1804 break;
1805 }
1806 if (task->tk_rebind_retry == 0)
1807 break;
1808 task->tk_rebind_retry--;
1809 rpc_delay(task, 3*HZ);
1810 goto retry_timeout;
1811 case -ETIMEDOUT:
1812 dprintk("RPC: %5u rpcbind request timed out\n",
1813 task->tk_pid);
1814 goto retry_timeout;
1815 case -EPFNOSUPPORT:
1816
1817 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1818 task->tk_pid);
1819 break;
1820 case -EPROTONOSUPPORT:
1821 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1822 task->tk_pid);
1823 goto retry_timeout;
1824 case -ECONNREFUSED:
1825 case -ECONNRESET:
1826 case -ECONNABORTED:
1827 case -ENOTCONN:
1828 case -EHOSTDOWN:
1829 case -ENETDOWN:
1830 case -EHOSTUNREACH:
1831 case -ENETUNREACH:
1832 case -ENOBUFS:
1833 case -EPIPE:
1834 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1835 task->tk_pid, task->tk_status);
1836 if (!RPC_IS_SOFTCONN(task)) {
1837 rpc_delay(task, 5*HZ);
1838 goto retry_timeout;
1839 }
1840 status = task->tk_status;
1841 break;
1842 default:
1843 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1844 task->tk_pid, -task->tk_status);
1845 }
1846
1847 rpc_exit(task, status);
1848 return;
1849
1850retry_timeout:
1851 task->tk_status = 0;
1852 task->tk_action = call_timeout;
1853}
1854
1855
1856
1857
1858static void
1859call_connect(struct rpc_task *task)
1860{
1861 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1862
1863 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1864 task->tk_pid, xprt,
1865 (xprt_connected(xprt) ? "is" : "is not"));
1866
1867 task->tk_action = call_transmit;
1868 if (!xprt_connected(xprt)) {
1869 task->tk_action = call_connect_status;
1870 if (task->tk_status < 0)
1871 return;
1872 if (task->tk_flags & RPC_TASK_NOCONNECT) {
1873 rpc_exit(task, -ENOTCONN);
1874 return;
1875 }
1876 xprt_connect(task);
1877 }
1878}
1879
1880
1881
1882
1883static void
1884call_connect_status(struct rpc_task *task)
1885{
1886 struct rpc_clnt *clnt = task->tk_client;
1887 int status = task->tk_status;
1888
1889 dprint_status(task);
1890
1891 trace_rpc_connect_status(task);
1892 task->tk_status = 0;
1893 switch (status) {
1894 case -ECONNREFUSED:
1895
1896 if (RPC_IS_SOFTCONN(task))
1897 break;
1898 if (clnt->cl_autobind) {
1899 rpc_force_rebind(clnt);
1900 task->tk_action = call_bind;
1901 return;
1902 }
1903
1904 case -ECONNRESET:
1905 case -ECONNABORTED:
1906 case -ENETDOWN:
1907 case -ENETUNREACH:
1908 case -EHOSTUNREACH:
1909 case -EADDRINUSE:
1910 case -ENOBUFS:
1911 case -EPIPE:
1912 xprt_conditional_disconnect(task->tk_rqstp->rq_xprt,
1913 task->tk_rqstp->rq_connect_cookie);
1914 if (RPC_IS_SOFTCONN(task))
1915 break;
1916
1917 rpc_delay(task, 3*HZ);
1918
1919 case -EAGAIN:
1920
1921 case -ETIMEDOUT:
1922 task->tk_action = call_timeout;
1923 return;
1924 case 0:
1925 clnt->cl_stats->netreconn++;
1926 task->tk_action = call_transmit;
1927 return;
1928 }
1929 rpc_exit(task, status);
1930}
1931
1932
1933
1934
1935static void
1936call_transmit(struct rpc_task *task)
1937{
1938 int is_retrans = RPC_WAS_SENT(task);
1939
1940 dprint_status(task);
1941
1942 task->tk_action = call_status;
1943 if (task->tk_status < 0)
1944 return;
1945 if (!xprt_prepare_transmit(task))
1946 return;
1947 task->tk_action = call_transmit_status;
1948
1949 if (rpc_task_need_encode(task)) {
1950 rpc_xdr_encode(task);
1951
1952 if (task->tk_status != 0) {
1953
1954 if (task->tk_status == -EAGAIN)
1955 rpc_delay(task, HZ >> 4);
1956 else
1957 rpc_exit(task, task->tk_status);
1958 return;
1959 }
1960 }
1961 xprt_transmit(task);
1962 if (task->tk_status < 0)
1963 return;
1964 if (is_retrans)
1965 task->tk_client->cl_stats->rpcretrans++;
1966
1967
1968
1969
1970 call_transmit_status(task);
1971 if (rpc_reply_expected(task))
1972 return;
1973 task->tk_action = rpc_exit_task;
1974 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1975}
1976
1977
1978
1979
1980static void
1981call_transmit_status(struct rpc_task *task)
1982{
1983 task->tk_action = call_status;
1984
1985
1986
1987
1988
1989 if (task->tk_status == 0) {
1990 xprt_end_transmit(task);
1991 rpc_task_force_reencode(task);
1992 return;
1993 }
1994
1995 switch (task->tk_status) {
1996 case -EAGAIN:
1997 case -ENOBUFS:
1998 break;
1999 default:
2000 dprint_status(task);
2001 xprt_end_transmit(task);
2002 rpc_task_force_reencode(task);
2003 break;
2004
2005
2006
2007
2008
2009
2010 case -ECONNREFUSED:
2011 case -EHOSTDOWN:
2012 case -ENETDOWN:
2013 case -EHOSTUNREACH:
2014 case -ENETUNREACH:
2015 case -EPERM:
2016 if (RPC_IS_SOFTCONN(task)) {
2017 xprt_end_transmit(task);
2018 if (!task->tk_msg.rpc_proc->p_proc)
2019 trace_xprt_ping(task->tk_xprt,
2020 task->tk_status);
2021 rpc_exit(task, task->tk_status);
2022 break;
2023 }
2024
2025 case -ECONNRESET:
2026 case -ECONNABORTED:
2027 case -EADDRINUSE:
2028 case -ENOTCONN:
2029 case -EPIPE:
2030 rpc_task_force_reencode(task);
2031 }
2032}
2033
2034#if defined(CONFIG_SUNRPC_BACKCHANNEL)
2035
2036
2037
2038
2039static void
2040call_bc_transmit(struct rpc_task *task)
2041{
2042 struct rpc_rqst *req = task->tk_rqstp;
2043
2044 if (!xprt_prepare_transmit(task))
2045 goto out_retry;
2046
2047 if (task->tk_status < 0) {
2048 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2049 "error: %d\n", task->tk_status);
2050 goto out_done;
2051 }
2052 if (req->rq_connect_cookie != req->rq_xprt->connect_cookie)
2053 req->rq_bytes_sent = 0;
2054
2055 xprt_transmit(task);
2056
2057 if (task->tk_status == -EAGAIN)
2058 goto out_nospace;
2059
2060 xprt_end_transmit(task);
2061 dprint_status(task);
2062 switch (task->tk_status) {
2063 case 0:
2064
2065 case -ENETDOWN:
2066 case -EHOSTDOWN:
2067 case -EHOSTUNREACH:
2068 case -ENETUNREACH:
2069 case -ECONNRESET:
2070 case -ECONNREFUSED:
2071 case -EADDRINUSE:
2072 case -ENOTCONN:
2073 case -EPIPE:
2074 break;
2075 case -ETIMEDOUT:
2076
2077
2078
2079
2080
2081
2082
2083 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2084 "error: %d\n", task->tk_status);
2085 xprt_conditional_disconnect(req->rq_xprt,
2086 req->rq_connect_cookie);
2087 break;
2088 default:
2089
2090
2091
2092
2093 WARN_ON_ONCE(task->tk_status == -EAGAIN);
2094 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2095 "error: %d\n", task->tk_status);
2096 break;
2097 }
2098 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
2099out_done:
2100 task->tk_action = rpc_exit_task;
2101 return;
2102out_nospace:
2103 req->rq_connect_cookie = req->rq_xprt->connect_cookie;
2104out_retry:
2105 task->tk_status = 0;
2106}
2107#endif
2108
2109
2110
2111
2112static void
2113call_status(struct rpc_task *task)
2114{
2115 struct rpc_clnt *clnt = task->tk_client;
2116 struct rpc_rqst *req = task->tk_rqstp;
2117 int status;
2118
2119 if (!task->tk_msg.rpc_proc->p_proc)
2120 trace_xprt_ping(task->tk_xprt, task->tk_status);
2121
2122 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
2123 task->tk_status = req->rq_reply_bytes_recvd;
2124
2125 dprint_status(task);
2126
2127 status = task->tk_status;
2128 if (status >= 0) {
2129 task->tk_action = call_decode;
2130 return;
2131 }
2132
2133 trace_rpc_call_status(task);
2134 task->tk_status = 0;
2135 switch(status) {
2136 case -EHOSTDOWN:
2137 case -ENETDOWN:
2138 case -EHOSTUNREACH:
2139 case -ENETUNREACH:
2140 case -EPERM:
2141 if (RPC_IS_SOFTCONN(task)) {
2142 rpc_exit(task, status);
2143 break;
2144 }
2145
2146
2147
2148
2149 rpc_delay(task, 3*HZ);
2150
2151 case -ETIMEDOUT:
2152 task->tk_action = call_timeout;
2153 break;
2154 case -ECONNREFUSED:
2155 case -ECONNRESET:
2156 case -ECONNABORTED:
2157 rpc_force_rebind(clnt);
2158
2159 case -EADDRINUSE:
2160 rpc_delay(task, 3*HZ);
2161
2162 case -EPIPE:
2163 case -ENOTCONN:
2164 task->tk_action = call_bind;
2165 break;
2166 case -ENOBUFS:
2167 rpc_delay(task, HZ>>2);
2168
2169 case -EAGAIN:
2170 task->tk_action = call_transmit;
2171 break;
2172 case -EIO:
2173
2174 rpc_exit(task, status);
2175 break;
2176 default:
2177 if (clnt->cl_chatty)
2178 printk("%s: RPC call returned error %d\n",
2179 clnt->cl_program->name, -status);
2180 rpc_exit(task, status);
2181 }
2182}
2183
2184
2185
2186
2187
2188
2189static void
2190call_timeout(struct rpc_task *task)
2191{
2192 struct rpc_clnt *clnt = task->tk_client;
2193
2194 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
2195 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
2196 goto retry;
2197 }
2198
2199 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
2200 task->tk_timeouts++;
2201
2202 if (RPC_IS_SOFTCONN(task)) {
2203 rpc_exit(task, -ETIMEDOUT);
2204 return;
2205 }
2206 if (RPC_IS_SOFT(task)) {
2207 if (clnt->cl_chatty) {
2208 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
2209 clnt->cl_program->name,
2210 task->tk_xprt->servername);
2211 }
2212 if (task->tk_flags & RPC_TASK_TIMEOUT)
2213 rpc_exit(task, -ETIMEDOUT);
2214 else
2215 rpc_exit(task, -EIO);
2216 return;
2217 }
2218
2219 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
2220 task->tk_flags |= RPC_CALL_MAJORSEEN;
2221 if (clnt->cl_chatty) {
2222 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
2223 clnt->cl_program->name,
2224 task->tk_xprt->servername);
2225 }
2226 }
2227 rpc_force_rebind(clnt);
2228
2229
2230
2231
2232 rpcauth_invalcred(task);
2233
2234retry:
2235 task->tk_action = call_bind;
2236 task->tk_status = 0;
2237}
2238
2239
2240
2241
2242static void
2243call_decode(struct rpc_task *task)
2244{
2245 struct rpc_clnt *clnt = task->tk_client;
2246 struct rpc_rqst *req = task->tk_rqstp;
2247 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
2248 __be32 *p;
2249
2250 dprint_status(task);
2251
2252 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
2253 if (clnt->cl_chatty) {
2254 printk(KERN_NOTICE "%s: server %s OK\n",
2255 clnt->cl_program->name,
2256 task->tk_xprt->servername);
2257 }
2258 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
2259 }
2260
2261
2262
2263
2264
2265 smp_rmb();
2266 req->rq_rcv_buf.len = req->rq_private_buf.len;
2267
2268
2269 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2270 sizeof(req->rq_rcv_buf)) != 0);
2271
2272 if (req->rq_rcv_buf.len < 12) {
2273 if (!RPC_IS_SOFT(task)) {
2274 task->tk_action = call_bind;
2275 goto out_retry;
2276 }
2277 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
2278 clnt->cl_program->name, task->tk_status);
2279 task->tk_action = call_timeout;
2280 goto out_retry;
2281 }
2282
2283 p = rpc_verify_header(task);
2284 if (IS_ERR(p)) {
2285 if (p == ERR_PTR(-EAGAIN))
2286 goto out_retry;
2287 return;
2288 }
2289
2290 task->tk_action = rpc_exit_task;
2291
2292 if (decode) {
2293 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
2294 task->tk_msg.rpc_resp);
2295 }
2296 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
2297 task->tk_status);
2298 return;
2299out_retry:
2300 task->tk_status = 0;
2301
2302 if (task->tk_rqstp == req) {
2303 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
2304 if (task->tk_client->cl_discrtry)
2305 xprt_conditional_disconnect(req->rq_xprt,
2306 req->rq_connect_cookie);
2307 }
2308}
2309
2310static __be32 *
2311rpc_encode_header(struct rpc_task *task)
2312{
2313 struct rpc_clnt *clnt = task->tk_client;
2314 struct rpc_rqst *req = task->tk_rqstp;
2315 __be32 *p = req->rq_svec[0].iov_base;
2316
2317
2318
2319 p = xprt_skip_transport_header(req->rq_xprt, p);
2320 *p++ = req->rq_xid;
2321 *p++ = htonl(RPC_CALL);
2322 *p++ = htonl(RPC_VERSION);
2323 *p++ = htonl(clnt->cl_prog);
2324 *p++ = htonl(clnt->cl_vers);
2325 *p++ = htonl(task->tk_msg.rpc_proc->p_proc);
2326 p = rpcauth_marshcred(task, p);
2327 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2328 return p;
2329}
2330
2331static __be32 *
2332rpc_verify_header(struct rpc_task *task)
2333{
2334 struct rpc_clnt *clnt = task->tk_client;
2335 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2336 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2337 __be32 *p = iov->iov_base;
2338 u32 n;
2339 int error = -EACCES;
2340
2341 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2342
2343
2344
2345
2346
2347 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2348 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2349 task->tk_rqstp->rq_rcv_buf.len);
2350 error = -EIO;
2351 goto out_err;
2352 }
2353 if ((len -= 3) < 0)
2354 goto out_overflow;
2355
2356 p += 1;
2357 if ((n = ntohl(*p++)) != RPC_REPLY) {
2358 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2359 task->tk_pid, __func__, n);
2360 error = -EIO;
2361 goto out_garbage;
2362 }
2363
2364 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2365 if (--len < 0)
2366 goto out_overflow;
2367 switch ((n = ntohl(*p++))) {
2368 case RPC_AUTH_ERROR:
2369 break;
2370 case RPC_MISMATCH:
2371 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2372 task->tk_pid, __func__);
2373 error = -EPROTONOSUPPORT;
2374 goto out_err;
2375 default:
2376 dprintk("RPC: %5u %s: RPC call rejected, "
2377 "unknown error: %x\n",
2378 task->tk_pid, __func__, n);
2379 error = -EIO;
2380 goto out_err;
2381 }
2382 if (--len < 0)
2383 goto out_overflow;
2384 switch ((n = ntohl(*p++))) {
2385 case RPC_AUTH_REJECTEDCRED:
2386 case RPC_AUTH_REJECTEDVERF:
2387 case RPCSEC_GSS_CREDPROBLEM:
2388 case RPCSEC_GSS_CTXPROBLEM:
2389 if (!task->tk_cred_retry)
2390 break;
2391 task->tk_cred_retry--;
2392 dprintk("RPC: %5u %s: retry stale creds\n",
2393 task->tk_pid, __func__);
2394 rpcauth_invalcred(task);
2395
2396 xprt_release(task);
2397 task->tk_action = call_reserve;
2398 goto out_retry;
2399 case RPC_AUTH_BADCRED:
2400 case RPC_AUTH_BADVERF:
2401
2402 if (!task->tk_garb_retry)
2403 break;
2404 task->tk_garb_retry--;
2405 dprintk("RPC: %5u %s: retry garbled creds\n",
2406 task->tk_pid, __func__);
2407 task->tk_action = call_bind;
2408 goto out_retry;
2409 case RPC_AUTH_TOOWEAK:
2410 printk(KERN_NOTICE "RPC: server %s requires stronger "
2411 "authentication.\n",
2412 task->tk_xprt->servername);
2413 break;
2414 default:
2415 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2416 task->tk_pid, __func__, n);
2417 error = -EIO;
2418 }
2419 dprintk("RPC: %5u %s: call rejected %d\n",
2420 task->tk_pid, __func__, n);
2421 goto out_err;
2422 }
2423 p = rpcauth_checkverf(task, p);
2424 if (IS_ERR(p)) {
2425 error = PTR_ERR(p);
2426 dprintk("RPC: %5u %s: auth check failed with %d\n",
2427 task->tk_pid, __func__, error);
2428 goto out_garbage;
2429 }
2430 len = p - (__be32 *)iov->iov_base - 1;
2431 if (len < 0)
2432 goto out_overflow;
2433 switch ((n = ntohl(*p++))) {
2434 case RPC_SUCCESS:
2435 return p;
2436 case RPC_PROG_UNAVAIL:
2437 dprintk("RPC: %5u %s: program %u is unsupported "
2438 "by server %s\n", task->tk_pid, __func__,
2439 (unsigned int)clnt->cl_prog,
2440 task->tk_xprt->servername);
2441 error = -EPFNOSUPPORT;
2442 goto out_err;
2443 case RPC_PROG_MISMATCH:
2444 dprintk("RPC: %5u %s: program %u, version %u unsupported "
2445 "by server %s\n", task->tk_pid, __func__,
2446 (unsigned int)clnt->cl_prog,
2447 (unsigned int)clnt->cl_vers,
2448 task->tk_xprt->servername);
2449 error = -EPROTONOSUPPORT;
2450 goto out_err;
2451 case RPC_PROC_UNAVAIL:
2452 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
2453 "version %u on server %s\n",
2454 task->tk_pid, __func__,
2455 rpc_proc_name(task),
2456 clnt->cl_prog, clnt->cl_vers,
2457 task->tk_xprt->servername);
2458 error = -EOPNOTSUPP;
2459 goto out_err;
2460 case RPC_GARBAGE_ARGS:
2461 dprintk("RPC: %5u %s: server saw garbage\n",
2462 task->tk_pid, __func__);
2463 break;
2464 default:
2465 dprintk("RPC: %5u %s: server accept status: %x\n",
2466 task->tk_pid, __func__, n);
2467
2468 }
2469
2470out_garbage:
2471 clnt->cl_stats->rpcgarbage++;
2472 if (task->tk_garb_retry) {
2473 task->tk_garb_retry--;
2474 dprintk("RPC: %5u %s: retrying\n",
2475 task->tk_pid, __func__);
2476 task->tk_action = call_bind;
2477out_retry:
2478 return ERR_PTR(-EAGAIN);
2479 }
2480out_err:
2481 rpc_exit(task, error);
2482 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2483 __func__, error);
2484 return ERR_PTR(error);
2485out_overflow:
2486 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2487 __func__);
2488 goto out_garbage;
2489}
2490
2491static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2492 const void *obj)
2493{
2494}
2495
2496static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2497 void *obj)
2498{
2499 return 0;
2500}
2501
2502static const struct rpc_procinfo rpcproc_null = {
2503 .p_encode = rpcproc_encode_null,
2504 .p_decode = rpcproc_decode_null,
2505};
2506
2507static int rpc_ping(struct rpc_clnt *clnt)
2508{
2509 struct rpc_message msg = {
2510 .rpc_proc = &rpcproc_null,
2511 };
2512 int err;
2513 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2514 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2515 put_rpccred(msg.rpc_cred);
2516 return err;
2517}
2518
2519static
2520struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt,
2521 struct rpc_xprt *xprt, struct rpc_cred *cred, int flags,
2522 const struct rpc_call_ops *ops, void *data)
2523{
2524 struct rpc_message msg = {
2525 .rpc_proc = &rpcproc_null,
2526 .rpc_cred = cred,
2527 };
2528 struct rpc_task_setup task_setup_data = {
2529 .rpc_client = clnt,
2530 .rpc_xprt = xprt,
2531 .rpc_message = &msg,
2532 .callback_ops = (ops != NULL) ? ops : &rpc_default_ops,
2533 .callback_data = data,
2534 .flags = flags,
2535 };
2536
2537 return rpc_run_task(&task_setup_data);
2538}
2539
2540struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2541{
2542 return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL);
2543}
2544EXPORT_SYMBOL_GPL(rpc_call_null);
2545
2546struct rpc_cb_add_xprt_calldata {
2547 struct rpc_xprt_switch *xps;
2548 struct rpc_xprt *xprt;
2549};
2550
2551static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata)
2552{
2553 struct rpc_cb_add_xprt_calldata *data = calldata;
2554
2555 if (task->tk_status == 0)
2556 rpc_xprt_switch_add_xprt(data->xps, data->xprt);
2557}
2558
2559static void rpc_cb_add_xprt_release(void *calldata)
2560{
2561 struct rpc_cb_add_xprt_calldata *data = calldata;
2562
2563 xprt_put(data->xprt);
2564 xprt_switch_put(data->xps);
2565 kfree(data);
2566}
2567
2568static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = {
2569 .rpc_call_done = rpc_cb_add_xprt_done,
2570 .rpc_release = rpc_cb_add_xprt_release,
2571};
2572
2573
2574
2575
2576
2577
2578
2579
2580int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
2581 struct rpc_xprt_switch *xps, struct rpc_xprt *xprt,
2582 void *dummy)
2583{
2584 struct rpc_cb_add_xprt_calldata *data;
2585 struct rpc_cred *cred;
2586 struct rpc_task *task;
2587
2588 data = kmalloc(sizeof(*data), GFP_NOFS);
2589 if (!data)
2590 return -ENOMEM;
2591 data->xps = xprt_switch_get(xps);
2592 data->xprt = xprt_get(xprt);
2593
2594 cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2595 task = rpc_call_null_helper(clnt, xprt, cred,
2596 RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC,
2597 &rpc_cb_add_xprt_call_ops, data);
2598 put_rpccred(cred);
2599 if (IS_ERR(task))
2600 return PTR_ERR(task);
2601 rpc_put_task(task);
2602 return 1;
2603}
2604EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt);
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt,
2625 struct rpc_xprt_switch *xps,
2626 struct rpc_xprt *xprt,
2627 void *data)
2628{
2629 struct rpc_cred *cred;
2630 struct rpc_task *task;
2631 struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data;
2632 int status = -EADDRINUSE;
2633
2634 xprt = xprt_get(xprt);
2635 xprt_switch_get(xps);
2636
2637 if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr))
2638 goto out_err;
2639
2640
2641 cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2642 task = rpc_call_null_helper(clnt, xprt, cred,
2643 RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
2644 NULL, NULL);
2645 put_rpccred(cred);
2646 if (IS_ERR(task)) {
2647 status = PTR_ERR(task);
2648 goto out_err;
2649 }
2650 status = task->tk_status;
2651 rpc_put_task(task);
2652
2653 if (status < 0)
2654 goto out_err;
2655
2656
2657 xtest->add_xprt_test(clnt, xprt, xtest->data);
2658
2659
2660 return 1;
2661out_err:
2662 xprt_put(xprt);
2663 xprt_switch_put(xps);
2664 pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n",
2665 status, xprt->address_strings[RPC_DISPLAY_ADDR]);
2666 return status;
2667}
2668EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt);
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
2684 struct xprt_create *xprtargs,
2685 int (*setup)(struct rpc_clnt *,
2686 struct rpc_xprt_switch *,
2687 struct rpc_xprt *,
2688 void *),
2689 void *data)
2690{
2691 struct rpc_xprt_switch *xps;
2692 struct rpc_xprt *xprt;
2693 unsigned long connect_timeout;
2694 unsigned long reconnect_timeout;
2695 unsigned char resvport;
2696 int ret = 0;
2697
2698 rcu_read_lock();
2699 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2700 xprt = xprt_iter_xprt(&clnt->cl_xpi);
2701 if (xps == NULL || xprt == NULL) {
2702 rcu_read_unlock();
2703 return -EAGAIN;
2704 }
2705 resvport = xprt->resvport;
2706 connect_timeout = xprt->connect_timeout;
2707 reconnect_timeout = xprt->max_reconnect_timeout;
2708 rcu_read_unlock();
2709
2710 xprt = xprt_create_transport(xprtargs);
2711 if (IS_ERR(xprt)) {
2712 ret = PTR_ERR(xprt);
2713 goto out_put_switch;
2714 }
2715 xprt->resvport = resvport;
2716 if (xprt->ops->set_connect_timeout != NULL)
2717 xprt->ops->set_connect_timeout(xprt,
2718 connect_timeout,
2719 reconnect_timeout);
2720
2721 rpc_xprt_switch_set_roundrobin(xps);
2722 if (setup) {
2723 ret = setup(clnt, xps, xprt, data);
2724 if (ret != 0)
2725 goto out_put_xprt;
2726 }
2727 rpc_xprt_switch_add_xprt(xps, xprt);
2728out_put_xprt:
2729 xprt_put(xprt);
2730out_put_switch:
2731 xprt_switch_put(xps);
2732 return ret;
2733}
2734EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt);
2735
2736struct connect_timeout_data {
2737 unsigned long connect_timeout;
2738 unsigned long reconnect_timeout;
2739};
2740
2741static int
2742rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt,
2743 struct rpc_xprt *xprt,
2744 void *data)
2745{
2746 struct connect_timeout_data *timeo = data;
2747
2748 if (xprt->ops->set_connect_timeout)
2749 xprt->ops->set_connect_timeout(xprt,
2750 timeo->connect_timeout,
2751 timeo->reconnect_timeout);
2752 return 0;
2753}
2754
2755void
2756rpc_set_connect_timeout(struct rpc_clnt *clnt,
2757 unsigned long connect_timeout,
2758 unsigned long reconnect_timeout)
2759{
2760 struct connect_timeout_data timeout = {
2761 .connect_timeout = connect_timeout,
2762 .reconnect_timeout = reconnect_timeout,
2763 };
2764 rpc_clnt_iterate_for_each_xprt(clnt,
2765 rpc_xprt_set_connect_timeout,
2766 &timeout);
2767}
2768EXPORT_SYMBOL_GPL(rpc_set_connect_timeout);
2769
2770void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt)
2771{
2772 rcu_read_lock();
2773 xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2774 rcu_read_unlock();
2775}
2776EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put);
2777
2778void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
2779{
2780 rcu_read_lock();
2781 rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch),
2782 xprt);
2783 rcu_read_unlock();
2784}
2785EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt);
2786
2787bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
2788 const struct sockaddr *sap)
2789{
2790 struct rpc_xprt_switch *xps;
2791 bool ret;
2792
2793 rcu_read_lock();
2794 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
2795 ret = rpc_xprt_switch_has_addr(xps, sap);
2796 rcu_read_unlock();
2797 return ret;
2798}
2799EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr);
2800
2801#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2802static void rpc_show_header(void)
2803{
2804 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2805 "-timeout ---ops--\n");
2806}
2807
2808static void rpc_show_task(const struct rpc_clnt *clnt,
2809 const struct rpc_task *task)
2810{
2811 const char *rpc_waitq = "none";
2812
2813 if (RPC_IS_QUEUED(task))
2814 rpc_waitq = rpc_qname(task->tk_waitqueue);
2815
2816 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2817 task->tk_pid, task->tk_flags, task->tk_status,
2818 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2819 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
2820 task->tk_action, rpc_waitq);
2821}
2822
2823void rpc_show_tasks(struct net *net)
2824{
2825 struct rpc_clnt *clnt;
2826 struct rpc_task *task;
2827 int header = 0;
2828 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2829
2830 spin_lock(&sn->rpc_client_lock);
2831 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2832 spin_lock(&clnt->cl_lock);
2833 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2834 if (!header) {
2835 rpc_show_header();
2836 header++;
2837 }
2838 rpc_show_task(clnt, task);
2839 }
2840 spin_unlock(&clnt->cl_lock);
2841 }
2842 spin_unlock(&sn->rpc_client_lock);
2843}
2844#endif
2845
2846#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2847static int
2848rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt,
2849 struct rpc_xprt *xprt,
2850 void *dummy)
2851{
2852 return xprt_enable_swap(xprt);
2853}
2854
2855int
2856rpc_clnt_swap_activate(struct rpc_clnt *clnt)
2857{
2858 if (atomic_inc_return(&clnt->cl_swapper) == 1)
2859 return rpc_clnt_iterate_for_each_xprt(clnt,
2860 rpc_clnt_swap_activate_callback, NULL);
2861 return 0;
2862}
2863EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
2864
2865static int
2866rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt,
2867 struct rpc_xprt *xprt,
2868 void *dummy)
2869{
2870 xprt_disable_swap(xprt);
2871 return 0;
2872}
2873
2874void
2875rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
2876{
2877 if (atomic_dec_if_positive(&clnt->cl_swapper) == 0)
2878 rpc_clnt_iterate_for_each_xprt(clnt,
2879 rpc_clnt_swap_deactivate_callback, NULL);
2880}
2881EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
2882#endif
2883