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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#ifdef RPC_DEBUG
46# define RPCDBG_FACILITY RPCDBG_CALL
47#endif
48
49#define dprint_status(t) \
50 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
51 __func__, t->tk_status)
52
53
54
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 int err = 0;
188
189 switch (event) {
190 case RPC_PIPEFS_MOUNT:
191 dentry = rpc_setup_pipedir_sb(sb, clnt);
192 if (!dentry)
193 return -ENOENT;
194 if (IS_ERR(dentry))
195 return PTR_ERR(dentry);
196 break;
197 case RPC_PIPEFS_UMOUNT:
198 __rpc_clnt_remove_pipedir(clnt);
199 break;
200 default:
201 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
202 return -ENOTSUPP;
203 }
204 return err;
205}
206
207static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
208 struct super_block *sb)
209{
210 int error = 0;
211
212 for (;; clnt = clnt->cl_parent) {
213 if (!rpc_clnt_skip_event(clnt, event))
214 error = __rpc_clnt_handle_event(clnt, event, sb);
215 if (error || clnt == clnt->cl_parent)
216 break;
217 }
218 return error;
219}
220
221static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
222{
223 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
224 struct rpc_clnt *clnt;
225
226 spin_lock(&sn->rpc_client_lock);
227 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
228 if (rpc_clnt_skip_event(clnt, event))
229 continue;
230 spin_unlock(&sn->rpc_client_lock);
231 return clnt;
232 }
233 spin_unlock(&sn->rpc_client_lock);
234 return NULL;
235}
236
237static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
238 void *ptr)
239{
240 struct super_block *sb = ptr;
241 struct rpc_clnt *clnt;
242 int error = 0;
243
244 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
245 error = __rpc_pipefs_event(clnt, event, sb);
246 if (error)
247 break;
248 }
249 return error;
250}
251
252static struct notifier_block rpc_clients_block = {
253 .notifier_call = rpc_pipefs_event,
254 .priority = SUNRPC_PIPEFS_RPC_PRIO,
255};
256
257int rpc_clients_notifier_register(void)
258{
259 return rpc_pipefs_notifier_register(&rpc_clients_block);
260}
261
262void rpc_clients_notifier_unregister(void)
263{
264 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
265}
266
267static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
268 struct rpc_xprt *xprt,
269 const struct rpc_timeout *timeout)
270{
271 struct rpc_xprt *old;
272
273 spin_lock(&clnt->cl_lock);
274 old = rcu_dereference_protected(clnt->cl_xprt,
275 lockdep_is_held(&clnt->cl_lock));
276
277 if (!xprt_bound(xprt))
278 clnt->cl_autobind = 1;
279
280 clnt->cl_timeout = timeout;
281 rcu_assign_pointer(clnt->cl_xprt, xprt);
282 spin_unlock(&clnt->cl_lock);
283
284 return old;
285}
286
287static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
288{
289 clnt->cl_nodelen = strlen(nodename);
290 if (clnt->cl_nodelen > UNX_MAXNODENAME)
291 clnt->cl_nodelen = UNX_MAXNODENAME;
292 memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen);
293}
294
295static int rpc_client_register(struct rpc_clnt *clnt,
296 rpc_authflavor_t pseudoflavor,
297 const char *client_name)
298{
299 struct rpc_auth_create_args auth_args = {
300 .pseudoflavor = pseudoflavor,
301 .target_name = client_name,
302 };
303 struct rpc_auth *auth;
304 struct net *net = rpc_net_ns(clnt);
305 struct super_block *pipefs_sb;
306 int err;
307
308 pipefs_sb = rpc_get_sb_net(net);
309 if (pipefs_sb) {
310 err = rpc_setup_pipedir(pipefs_sb, clnt);
311 if (err)
312 goto out;
313 }
314
315 rpc_register_client(clnt);
316 if (pipefs_sb)
317 rpc_put_sb_net(net);
318
319 auth = rpcauth_create(&auth_args, clnt);
320 if (IS_ERR(auth)) {
321 dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
322 pseudoflavor);
323 err = PTR_ERR(auth);
324 goto err_auth;
325 }
326 return 0;
327err_auth:
328 pipefs_sb = rpc_get_sb_net(net);
329 rpc_unregister_client(clnt);
330 __rpc_clnt_remove_pipedir(clnt);
331out:
332 if (pipefs_sb)
333 rpc_put_sb_net(net);
334 return err;
335}
336
337static DEFINE_IDA(rpc_clids);
338
339static int rpc_alloc_clid(struct rpc_clnt *clnt)
340{
341 int clid;
342
343 clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
344 if (clid < 0)
345 return clid;
346 clnt->cl_clid = clid;
347 return 0;
348}
349
350static void rpc_free_clid(struct rpc_clnt *clnt)
351{
352 ida_simple_remove(&rpc_clids, clnt->cl_clid);
353}
354
355static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
356 struct rpc_xprt *xprt,
357 struct rpc_clnt *parent)
358{
359 const struct rpc_program *program = args->program;
360 const struct rpc_version *version;
361 struct rpc_clnt *clnt = NULL;
362 const struct rpc_timeout *timeout;
363 int err;
364
365
366 dprintk("RPC: creating %s client for %s (xprt %p)\n",
367 program->name, args->servername, xprt);
368
369 err = rpciod_up();
370 if (err)
371 goto out_no_rpciod;
372
373 err = -EINVAL;
374 if (args->version >= program->nrvers)
375 goto out_err;
376 version = program->version[args->version];
377 if (version == NULL)
378 goto out_err;
379
380 err = -ENOMEM;
381 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
382 if (!clnt)
383 goto out_err;
384 clnt->cl_parent = parent ? : clnt;
385
386 err = rpc_alloc_clid(clnt);
387 if (err)
388 goto out_no_clid;
389
390 clnt->cl_procinfo = version->procs;
391 clnt->cl_maxproc = version->nrprocs;
392 clnt->cl_prog = args->prognumber ? : program->number;
393 clnt->cl_vers = version->number;
394 clnt->cl_stats = program->stats;
395 clnt->cl_metrics = rpc_alloc_iostats(clnt);
396 rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
397 err = -ENOMEM;
398 if (clnt->cl_metrics == NULL)
399 goto out_no_stats;
400 clnt->cl_program = program;
401 INIT_LIST_HEAD(&clnt->cl_tasks);
402 spin_lock_init(&clnt->cl_lock);
403
404 timeout = xprt->timeout;
405 if (args->timeout != NULL) {
406 memcpy(&clnt->cl_timeout_default, args->timeout,
407 sizeof(clnt->cl_timeout_default));
408 timeout = &clnt->cl_timeout_default;
409 }
410
411 rpc_clnt_set_transport(clnt, xprt, timeout);
412
413 clnt->cl_rtt = &clnt->cl_rtt_default;
414 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
415
416 atomic_set(&clnt->cl_count, 1);
417
418
419 rpc_clnt_set_nodename(clnt, utsname()->nodename);
420
421 err = rpc_client_register(clnt, args->authflavor, args->client_name);
422 if (err)
423 goto out_no_path;
424 if (parent)
425 atomic_inc(&parent->cl_count);
426 return clnt;
427
428out_no_path:
429 rpc_free_iostats(clnt->cl_metrics);
430out_no_stats:
431 rpc_free_clid(clnt);
432out_no_clid:
433 kfree(clnt);
434out_err:
435 rpciod_down();
436out_no_rpciod:
437 xprt_put(xprt);
438 return ERR_PTR(err);
439}
440
441struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
442 struct rpc_xprt *xprt)
443{
444 struct rpc_clnt *clnt = NULL;
445
446 clnt = rpc_new_client(args, xprt, NULL);
447 if (IS_ERR(clnt))
448 return clnt;
449
450 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
451 int err = rpc_ping(clnt);
452 if (err != 0) {
453 rpc_shutdown_client(clnt);
454 return ERR_PTR(err);
455 }
456 }
457
458 clnt->cl_softrtry = 1;
459 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
460 clnt->cl_softrtry = 0;
461
462 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
463 clnt->cl_autobind = 1;
464 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
465 clnt->cl_discrtry = 1;
466 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
467 clnt->cl_chatty = 1;
468
469 return clnt;
470}
471EXPORT_SYMBOL_GPL(rpc_create_xprt);
472
473
474
475
476
477
478
479
480
481
482
483struct rpc_clnt *rpc_create(struct rpc_create_args *args)
484{
485 struct rpc_xprt *xprt;
486 struct xprt_create xprtargs = {
487 .net = args->net,
488 .ident = args->protocol,
489 .srcaddr = args->saddress,
490 .dstaddr = args->address,
491 .addrlen = args->addrsize,
492 .servername = args->servername,
493 .bc_xprt = args->bc_xprt,
494 };
495 char servername[48];
496
497 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
498 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
499 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
500 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
501
502
503
504
505 if (xprtargs.servername == NULL) {
506 struct sockaddr_un *sun =
507 (struct sockaddr_un *)args->address;
508 struct sockaddr_in *sin =
509 (struct sockaddr_in *)args->address;
510 struct sockaddr_in6 *sin6 =
511 (struct sockaddr_in6 *)args->address;
512
513 servername[0] = '\0';
514 switch (args->address->sa_family) {
515 case AF_LOCAL:
516 snprintf(servername, sizeof(servername), "%s",
517 sun->sun_path);
518 break;
519 case AF_INET:
520 snprintf(servername, sizeof(servername), "%pI4",
521 &sin->sin_addr.s_addr);
522 break;
523 case AF_INET6:
524 snprintf(servername, sizeof(servername), "%pI6",
525 &sin6->sin6_addr);
526 break;
527 default:
528
529
530 return ERR_PTR(-EINVAL);
531 }
532 xprtargs.servername = servername;
533 }
534
535 xprt = xprt_create_transport(&xprtargs);
536 if (IS_ERR(xprt))
537 return (struct rpc_clnt *)xprt;
538
539
540
541
542
543
544
545 xprt->resvport = 1;
546 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
547 xprt->resvport = 0;
548
549 return rpc_create_xprt(args, xprt);
550}
551EXPORT_SYMBOL_GPL(rpc_create);
552
553
554
555
556
557
558static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
559 struct rpc_clnt *clnt)
560{
561 struct rpc_xprt *xprt;
562 struct rpc_clnt *new;
563 int err;
564
565 err = -ENOMEM;
566 rcu_read_lock();
567 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
568 rcu_read_unlock();
569 if (xprt == NULL)
570 goto out_err;
571 args->servername = xprt->servername;
572
573 new = rpc_new_client(args, xprt, clnt);
574 if (IS_ERR(new)) {
575 err = PTR_ERR(new);
576 goto out_err;
577 }
578
579
580 new->cl_autobind = 0;
581 new->cl_softrtry = clnt->cl_softrtry;
582 new->cl_discrtry = clnt->cl_discrtry;
583 new->cl_chatty = clnt->cl_chatty;
584 return new;
585
586out_err:
587 dprintk("RPC: %s: returned error %d\n", __func__, err);
588 return ERR_PTR(err);
589}
590
591
592
593
594
595
596
597
598struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
599{
600 struct rpc_create_args args = {
601 .program = clnt->cl_program,
602 .prognumber = clnt->cl_prog,
603 .version = clnt->cl_vers,
604 .authflavor = clnt->cl_auth->au_flavor,
605 };
606 return __rpc_clone_client(&args, clnt);
607}
608EXPORT_SYMBOL_GPL(rpc_clone_client);
609
610
611
612
613
614
615
616
617
618struct rpc_clnt *
619rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
620{
621 struct rpc_create_args args = {
622 .program = clnt->cl_program,
623 .prognumber = clnt->cl_prog,
624 .version = clnt->cl_vers,
625 .authflavor = flavor,
626 };
627 return __rpc_clone_client(&args, clnt);
628}
629EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646int rpc_switch_client_transport(struct rpc_clnt *clnt,
647 struct xprt_create *args,
648 const struct rpc_timeout *timeout)
649{
650 const struct rpc_timeout *old_timeo;
651 rpc_authflavor_t pseudoflavor;
652 struct rpc_xprt *xprt, *old;
653 struct rpc_clnt *parent;
654 int err;
655
656 xprt = xprt_create_transport(args);
657 if (IS_ERR(xprt)) {
658 dprintk("RPC: failed to create new xprt for clnt %p\n",
659 clnt);
660 return PTR_ERR(xprt);
661 }
662
663 pseudoflavor = clnt->cl_auth->au_flavor;
664
665 old_timeo = clnt->cl_timeout;
666 old = rpc_clnt_set_transport(clnt, xprt, timeout);
667
668 rpc_unregister_client(clnt);
669 __rpc_clnt_remove_pipedir(clnt);
670
671
672
673
674
675
676 parent = clnt->cl_parent;
677 clnt->cl_parent = clnt;
678
679
680
681
682
683
684 err = rpc_client_register(clnt, pseudoflavor, NULL);
685 if (err)
686 goto out_revert;
687
688 synchronize_rcu();
689 if (parent != clnt)
690 rpc_release_client(parent);
691 xprt_put(old);
692 dprintk("RPC: replaced xprt for clnt %p\n", clnt);
693 return 0;
694
695out_revert:
696 rpc_clnt_set_transport(clnt, old, old_timeo);
697 clnt->cl_parent = parent;
698 rpc_client_register(clnt, pseudoflavor, NULL);
699 xprt_put(xprt);
700 dprintk("RPC: failed to switch xprt for clnt %p\n", clnt);
701 return err;
702}
703EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
704
705
706
707
708
709void rpc_killall_tasks(struct rpc_clnt *clnt)
710{
711 struct rpc_task *rovr;
712
713
714 if (list_empty(&clnt->cl_tasks))
715 return;
716 dprintk("RPC: killing all tasks for client %p\n", clnt);
717
718
719
720 spin_lock(&clnt->cl_lock);
721 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
722 if (!RPC_IS_ACTIVATED(rovr))
723 continue;
724 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
725 rovr->tk_flags |= RPC_TASK_KILLED;
726 rpc_exit(rovr, -EIO);
727 if (RPC_IS_QUEUED(rovr))
728 rpc_wake_up_queued_task(rovr->tk_waitqueue,
729 rovr);
730 }
731 }
732 spin_unlock(&clnt->cl_lock);
733}
734EXPORT_SYMBOL_GPL(rpc_killall_tasks);
735
736
737
738
739
740void rpc_shutdown_client(struct rpc_clnt *clnt)
741{
742 might_sleep();
743
744 dprintk_rcu("RPC: shutting down %s client for %s\n",
745 clnt->cl_program->name,
746 rcu_dereference(clnt->cl_xprt)->servername);
747
748 while (!list_empty(&clnt->cl_tasks)) {
749 rpc_killall_tasks(clnt);
750 wait_event_timeout(destroy_wait,
751 list_empty(&clnt->cl_tasks), 1*HZ);
752 }
753
754 rpc_release_client(clnt);
755}
756EXPORT_SYMBOL_GPL(rpc_shutdown_client);
757
758
759
760
761static struct rpc_clnt *
762rpc_free_client(struct rpc_clnt *clnt)
763{
764 struct rpc_clnt *parent = NULL;
765
766 dprintk_rcu("RPC: destroying %s client for %s\n",
767 clnt->cl_program->name,
768 rcu_dereference(clnt->cl_xprt)->servername);
769 if (clnt->cl_parent != clnt)
770 parent = clnt->cl_parent;
771 rpc_clnt_remove_pipedir(clnt);
772 rpc_unregister_client(clnt);
773 rpc_free_iostats(clnt->cl_metrics);
774 clnt->cl_metrics = NULL;
775 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
776 rpciod_down();
777 rpc_free_clid(clnt);
778 kfree(clnt);
779 return parent;
780}
781
782
783
784
785static struct rpc_clnt *
786rpc_free_auth(struct rpc_clnt *clnt)
787{
788 if (clnt->cl_auth == NULL)
789 return rpc_free_client(clnt);
790
791
792
793
794
795
796 atomic_inc(&clnt->cl_count);
797 rpcauth_release(clnt->cl_auth);
798 clnt->cl_auth = NULL;
799 if (atomic_dec_and_test(&clnt->cl_count))
800 return rpc_free_client(clnt);
801 return NULL;
802}
803
804
805
806
807void
808rpc_release_client(struct rpc_clnt *clnt)
809{
810 dprintk("RPC: rpc_release_client(%p)\n", clnt);
811
812 do {
813 if (list_empty(&clnt->cl_tasks))
814 wake_up(&destroy_wait);
815 if (!atomic_dec_and_test(&clnt->cl_count))
816 break;
817 clnt = rpc_free_auth(clnt);
818 } while (clnt != NULL);
819}
820EXPORT_SYMBOL_GPL(rpc_release_client);
821
822
823
824
825
826
827
828
829
830
831
832struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
833 const struct rpc_program *program,
834 u32 vers)
835{
836 struct rpc_create_args args = {
837 .program = program,
838 .prognumber = program->number,
839 .version = vers,
840 .authflavor = old->cl_auth->au_flavor,
841 };
842 struct rpc_clnt *clnt;
843 int err;
844
845 clnt = __rpc_clone_client(&args, old);
846 if (IS_ERR(clnt))
847 goto out;
848 err = rpc_ping(clnt);
849 if (err != 0) {
850 rpc_shutdown_client(clnt);
851 clnt = ERR_PTR(err);
852 }
853out:
854 return clnt;
855}
856EXPORT_SYMBOL_GPL(rpc_bind_new_program);
857
858void rpc_task_release_client(struct rpc_task *task)
859{
860 struct rpc_clnt *clnt = task->tk_client;
861
862 if (clnt != NULL) {
863
864 spin_lock(&clnt->cl_lock);
865 list_del(&task->tk_task);
866 spin_unlock(&clnt->cl_lock);
867 task->tk_client = NULL;
868
869 rpc_release_client(clnt);
870 }
871}
872
873static
874void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
875{
876 if (clnt != NULL) {
877 rpc_task_release_client(task);
878 task->tk_client = clnt;
879 atomic_inc(&clnt->cl_count);
880 if (clnt->cl_softrtry)
881 task->tk_flags |= RPC_TASK_SOFT;
882 if (clnt->cl_noretranstimeo)
883 task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
884 if (sk_memalloc_socks()) {
885 struct rpc_xprt *xprt;
886
887 rcu_read_lock();
888 xprt = rcu_dereference(clnt->cl_xprt);
889 if (xprt->swapper)
890 task->tk_flags |= RPC_TASK_SWAPPER;
891 rcu_read_unlock();
892 }
893
894 spin_lock(&clnt->cl_lock);
895 list_add_tail(&task->tk_task, &clnt->cl_tasks);
896 spin_unlock(&clnt->cl_lock);
897 }
898}
899
900void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
901{
902 rpc_task_release_client(task);
903 rpc_task_set_client(task, clnt);
904}
905EXPORT_SYMBOL_GPL(rpc_task_reset_client);
906
907
908static void
909rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
910{
911 if (msg != NULL) {
912 task->tk_msg.rpc_proc = msg->rpc_proc;
913 task->tk_msg.rpc_argp = msg->rpc_argp;
914 task->tk_msg.rpc_resp = msg->rpc_resp;
915 if (msg->rpc_cred != NULL)
916 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
917 }
918}
919
920
921
922
923static void
924rpc_default_callback(struct rpc_task *task, void *data)
925{
926}
927
928static const struct rpc_call_ops rpc_default_ops = {
929 .rpc_call_done = rpc_default_callback,
930};
931
932
933
934
935
936struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
937{
938 struct rpc_task *task;
939
940 task = rpc_new_task(task_setup_data);
941 if (IS_ERR(task))
942 goto out;
943
944 rpc_task_set_client(task, task_setup_data->rpc_client);
945 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
946
947 if (task->tk_action == NULL)
948 rpc_call_start(task);
949
950 atomic_inc(&task->tk_count);
951 rpc_execute(task);
952out:
953 return task;
954}
955EXPORT_SYMBOL_GPL(rpc_run_task);
956
957
958
959
960
961
962
963int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
964{
965 struct rpc_task *task;
966 struct rpc_task_setup task_setup_data = {
967 .rpc_client = clnt,
968 .rpc_message = msg,
969 .callback_ops = &rpc_default_ops,
970 .flags = flags,
971 };
972 int status;
973
974 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
975 if (flags & RPC_TASK_ASYNC) {
976 rpc_release_calldata(task_setup_data.callback_ops,
977 task_setup_data.callback_data);
978 return -EINVAL;
979 }
980
981 task = rpc_run_task(&task_setup_data);
982 if (IS_ERR(task))
983 return PTR_ERR(task);
984 status = task->tk_status;
985 rpc_put_task(task);
986 return status;
987}
988EXPORT_SYMBOL_GPL(rpc_call_sync);
989
990
991
992
993
994
995
996
997
998int
999rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
1000 const struct rpc_call_ops *tk_ops, void *data)
1001{
1002 struct rpc_task *task;
1003 struct rpc_task_setup task_setup_data = {
1004 .rpc_client = clnt,
1005 .rpc_message = msg,
1006 .callback_ops = tk_ops,
1007 .callback_data = data,
1008 .flags = flags|RPC_TASK_ASYNC,
1009 };
1010
1011 task = rpc_run_task(&task_setup_data);
1012 if (IS_ERR(task))
1013 return PTR_ERR(task);
1014 rpc_put_task(task);
1015 return 0;
1016}
1017EXPORT_SYMBOL_GPL(rpc_call_async);
1018
1019#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1020
1021
1022
1023
1024
1025
1026struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
1027 const struct rpc_call_ops *tk_ops)
1028{
1029 struct rpc_task *task;
1030 struct xdr_buf *xbufp = &req->rq_snd_buf;
1031 struct rpc_task_setup task_setup_data = {
1032 .callback_ops = tk_ops,
1033 };
1034
1035 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
1036
1037
1038
1039 task = rpc_new_task(&task_setup_data);
1040 if (IS_ERR(task)) {
1041 xprt_free_bc_request(req);
1042 goto out;
1043 }
1044 task->tk_rqstp = req;
1045
1046
1047
1048
1049
1050 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
1051 xbufp->tail[0].iov_len;
1052
1053 task->tk_action = call_bc_transmit;
1054 atomic_inc(&task->tk_count);
1055 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
1056 rpc_execute(task);
1057
1058out:
1059 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
1060 return task;
1061}
1062#endif
1063
1064void
1065rpc_call_start(struct rpc_task *task)
1066{
1067 task->tk_action = call_start;
1068}
1069EXPORT_SYMBOL_GPL(rpc_call_start);
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
1080{
1081 size_t bytes;
1082 struct rpc_xprt *xprt;
1083
1084 rcu_read_lock();
1085 xprt = rcu_dereference(clnt->cl_xprt);
1086
1087 bytes = xprt->addrlen;
1088 if (bytes > bufsize)
1089 bytes = bufsize;
1090 memcpy(buf, &xprt->addr, bytes);
1091 rcu_read_unlock();
1092
1093 return bytes;
1094}
1095EXPORT_SYMBOL_GPL(rpc_peeraddr);
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
1107 enum rpc_display_format_t format)
1108{
1109 struct rpc_xprt *xprt;
1110
1111 xprt = rcu_dereference(clnt->cl_xprt);
1112
1113 if (xprt->address_strings[format] != NULL)
1114 return xprt->address_strings[format];
1115 else
1116 return "unprintable";
1117}
1118EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
1119
1120static const struct sockaddr_in rpc_inaddr_loopback = {
1121 .sin_family = AF_INET,
1122 .sin_addr.s_addr = htonl(INADDR_ANY),
1123};
1124
1125static const struct sockaddr_in6 rpc_in6addr_loopback = {
1126 .sin6_family = AF_INET6,
1127 .sin6_addr = IN6ADDR_ANY_INIT,
1128};
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1139 struct sockaddr *buf, int buflen)
1140{
1141 struct socket *sock;
1142 int err;
1143
1144 err = __sock_create(net, sap->sa_family,
1145 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1146 if (err < 0) {
1147 dprintk("RPC: can't create UDP socket (%d)\n", err);
1148 goto out;
1149 }
1150
1151 switch (sap->sa_family) {
1152 case AF_INET:
1153 err = kernel_bind(sock,
1154 (struct sockaddr *)&rpc_inaddr_loopback,
1155 sizeof(rpc_inaddr_loopback));
1156 break;
1157 case AF_INET6:
1158 err = kernel_bind(sock,
1159 (struct sockaddr *)&rpc_in6addr_loopback,
1160 sizeof(rpc_in6addr_loopback));
1161 break;
1162 default:
1163 err = -EAFNOSUPPORT;
1164 goto out;
1165 }
1166 if (err < 0) {
1167 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1168 goto out_release;
1169 }
1170
1171 err = kernel_connect(sock, sap, salen, 0);
1172 if (err < 0) {
1173 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1174 goto out_release;
1175 }
1176
1177 err = kernel_getsockname(sock, buf, &buflen);
1178 if (err < 0) {
1179 dprintk("RPC: getsockname failed (%d)\n", err);
1180 goto out_release;
1181 }
1182
1183 err = 0;
1184 if (buf->sa_family == AF_INET6) {
1185 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1186 sin6->sin6_scope_id = 0;
1187 }
1188 dprintk("RPC: %s succeeded\n", __func__);
1189
1190out_release:
1191 sock_release(sock);
1192out:
1193 return err;
1194}
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1205{
1206 switch (family) {
1207 case AF_INET:
1208 if (buflen < sizeof(rpc_inaddr_loopback))
1209 return -EINVAL;
1210 memcpy(buf, &rpc_inaddr_loopback,
1211 sizeof(rpc_inaddr_loopback));
1212 break;
1213 case AF_INET6:
1214 if (buflen < sizeof(rpc_in6addr_loopback))
1215 return -EINVAL;
1216 memcpy(buf, &rpc_in6addr_loopback,
1217 sizeof(rpc_in6addr_loopback));
1218 default:
1219 dprintk("RPC: %s: address family not supported\n",
1220 __func__);
1221 return -EAFNOSUPPORT;
1222 }
1223 dprintk("RPC: %s: succeeded\n", __func__);
1224 return 0;
1225}
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1244{
1245 struct sockaddr_storage address;
1246 struct sockaddr *sap = (struct sockaddr *)&address;
1247 struct rpc_xprt *xprt;
1248 struct net *net;
1249 size_t salen;
1250 int err;
1251
1252 rcu_read_lock();
1253 xprt = rcu_dereference(clnt->cl_xprt);
1254 salen = xprt->addrlen;
1255 memcpy(sap, &xprt->addr, salen);
1256 net = get_net(xprt->xprt_net);
1257 rcu_read_unlock();
1258
1259 rpc_set_port(sap, 0);
1260 err = rpc_sockname(net, sap, salen, buf, buflen);
1261 put_net(net);
1262 if (err != 0)
1263
1264 return rpc_anyaddr(sap->sa_family, buf, buflen);
1265 return 0;
1266}
1267EXPORT_SYMBOL_GPL(rpc_localaddr);
1268
1269void
1270rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1271{
1272 struct rpc_xprt *xprt;
1273
1274 rcu_read_lock();
1275 xprt = rcu_dereference(clnt->cl_xprt);
1276 if (xprt->ops->set_buffer_size)
1277 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1278 rcu_read_unlock();
1279}
1280EXPORT_SYMBOL_GPL(rpc_setbufsize);
1281
1282
1283
1284
1285
1286
1287int rpc_protocol(struct rpc_clnt *clnt)
1288{
1289 int protocol;
1290
1291 rcu_read_lock();
1292 protocol = rcu_dereference(clnt->cl_xprt)->prot;
1293 rcu_read_unlock();
1294 return protocol;
1295}
1296EXPORT_SYMBOL_GPL(rpc_protocol);
1297
1298
1299
1300
1301
1302
1303struct net *rpc_net_ns(struct rpc_clnt *clnt)
1304{
1305 struct net *ret;
1306
1307 rcu_read_lock();
1308 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1309 rcu_read_unlock();
1310 return ret;
1311}
1312EXPORT_SYMBOL_GPL(rpc_net_ns);
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323size_t rpc_max_payload(struct rpc_clnt *clnt)
1324{
1325 size_t ret;
1326
1327 rcu_read_lock();
1328 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1329 rcu_read_unlock();
1330 return ret;
1331}
1332EXPORT_SYMBOL_GPL(rpc_max_payload);
1333
1334
1335
1336
1337
1338unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
1339{
1340 unsigned long ret;
1341
1342 rcu_read_lock();
1343 ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval;
1344 rcu_read_unlock();
1345 return ret;
1346}
1347EXPORT_SYMBOL_GPL(rpc_get_timeout);
1348
1349
1350
1351
1352
1353
1354void rpc_force_rebind(struct rpc_clnt *clnt)
1355{
1356 if (clnt->cl_autobind) {
1357 rcu_read_lock();
1358 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1359 rcu_read_unlock();
1360 }
1361}
1362EXPORT_SYMBOL_GPL(rpc_force_rebind);
1363
1364
1365
1366
1367
1368int
1369rpc_restart_call_prepare(struct rpc_task *task)
1370{
1371 if (RPC_ASSASSINATED(task))
1372 return 0;
1373 task->tk_action = call_start;
1374 task->tk_status = 0;
1375 if (task->tk_ops->rpc_call_prepare != NULL)
1376 task->tk_action = rpc_prepare_task;
1377 return 1;
1378}
1379EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1380
1381
1382
1383
1384
1385int
1386rpc_restart_call(struct rpc_task *task)
1387{
1388 if (RPC_ASSASSINATED(task))
1389 return 0;
1390 task->tk_action = call_start;
1391 task->tk_status = 0;
1392 return 1;
1393}
1394EXPORT_SYMBOL_GPL(rpc_restart_call);
1395
1396#ifdef RPC_DEBUG
1397static const char *rpc_proc_name(const struct rpc_task *task)
1398{
1399 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1400
1401 if (proc) {
1402 if (proc->p_name)
1403 return proc->p_name;
1404 else
1405 return "NULL";
1406 } else
1407 return "no proc";
1408}
1409#endif
1410
1411
1412
1413
1414
1415
1416
1417static void
1418call_start(struct rpc_task *task)
1419{
1420 struct rpc_clnt *clnt = task->tk_client;
1421
1422 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1423 clnt->cl_program->name, clnt->cl_vers,
1424 rpc_proc_name(task),
1425 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1426
1427
1428 task->tk_msg.rpc_proc->p_count++;
1429 clnt->cl_stats->rpccnt++;
1430 task->tk_action = call_reserve;
1431}
1432
1433
1434
1435
1436static void
1437call_reserve(struct rpc_task *task)
1438{
1439 dprint_status(task);
1440
1441 task->tk_status = 0;
1442 task->tk_action = call_reserveresult;
1443 xprt_reserve(task);
1444}
1445
1446static void call_retry_reserve(struct rpc_task *task);
1447
1448
1449
1450
1451static void
1452call_reserveresult(struct rpc_task *task)
1453{
1454 int status = task->tk_status;
1455
1456 dprint_status(task);
1457
1458
1459
1460
1461
1462 task->tk_status = 0;
1463 if (status >= 0) {
1464 if (task->tk_rqstp) {
1465 task->tk_action = call_refresh;
1466 return;
1467 }
1468
1469 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1470 __func__, status);
1471 rpc_exit(task, -EIO);
1472 return;
1473 }
1474
1475
1476
1477
1478
1479 if (task->tk_rqstp) {
1480 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1481 __func__, status);
1482 xprt_release(task);
1483 }
1484
1485 switch (status) {
1486 case -ENOMEM:
1487 rpc_delay(task, HZ >> 2);
1488 case -EAGAIN:
1489 task->tk_action = call_retry_reserve;
1490 return;
1491 case -EIO:
1492 break;
1493 default:
1494 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1495 __func__, status);
1496 break;
1497 }
1498 rpc_exit(task, status);
1499}
1500
1501
1502
1503
1504static void
1505call_retry_reserve(struct rpc_task *task)
1506{
1507 dprint_status(task);
1508
1509 task->tk_status = 0;
1510 task->tk_action = call_reserveresult;
1511 xprt_retry_reserve(task);
1512}
1513
1514
1515
1516
1517static void
1518call_refresh(struct rpc_task *task)
1519{
1520 dprint_status(task);
1521
1522 task->tk_action = call_refreshresult;
1523 task->tk_status = 0;
1524 task->tk_client->cl_stats->rpcauthrefresh++;
1525 rpcauth_refreshcred(task);
1526}
1527
1528
1529
1530
1531static void
1532call_refreshresult(struct rpc_task *task)
1533{
1534 int status = task->tk_status;
1535
1536 dprint_status(task);
1537
1538 task->tk_status = 0;
1539 task->tk_action = call_refresh;
1540 switch (status) {
1541 case 0:
1542 if (rpcauth_uptodatecred(task)) {
1543 task->tk_action = call_allocate;
1544 return;
1545 }
1546
1547
1548
1549 case -ETIMEDOUT:
1550 rpc_delay(task, 3*HZ);
1551 case -EAGAIN:
1552 status = -EACCES;
1553 case -EKEYEXPIRED:
1554 if (!task->tk_cred_retry)
1555 break;
1556 task->tk_cred_retry--;
1557 dprintk("RPC: %5u %s: retry refresh creds\n",
1558 task->tk_pid, __func__);
1559 return;
1560 }
1561 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1562 task->tk_pid, __func__, status);
1563 rpc_exit(task, status);
1564}
1565
1566
1567
1568
1569
1570static void
1571call_allocate(struct rpc_task *task)
1572{
1573 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1574 struct rpc_rqst *req = task->tk_rqstp;
1575 struct rpc_xprt *xprt = req->rq_xprt;
1576 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1577
1578 dprint_status(task);
1579
1580 task->tk_status = 0;
1581 task->tk_action = call_bind;
1582
1583 if (req->rq_buffer)
1584 return;
1585
1586 if (proc->p_proc != 0) {
1587 BUG_ON(proc->p_arglen == 0);
1588 if (proc->p_decode != NULL)
1589 BUG_ON(proc->p_replen == 0);
1590 }
1591
1592
1593
1594
1595
1596
1597 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1598 req->rq_callsize <<= 2;
1599 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1600 req->rq_rcvsize <<= 2;
1601
1602 req->rq_buffer = xprt->ops->buf_alloc(task,
1603 req->rq_callsize + req->rq_rcvsize);
1604 if (req->rq_buffer != NULL)
1605 return;
1606
1607 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1608
1609 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1610 task->tk_action = call_allocate;
1611 rpc_delay(task, HZ>>4);
1612 return;
1613 }
1614
1615 rpc_exit(task, -ERESTARTSYS);
1616}
1617
1618static inline int
1619rpc_task_need_encode(struct rpc_task *task)
1620{
1621 return task->tk_rqstp->rq_snd_buf.len == 0;
1622}
1623
1624static inline void
1625rpc_task_force_reencode(struct rpc_task *task)
1626{
1627 task->tk_rqstp->rq_snd_buf.len = 0;
1628 task->tk_rqstp->rq_bytes_sent = 0;
1629}
1630
1631static inline void
1632rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1633{
1634 buf->head[0].iov_base = start;
1635 buf->head[0].iov_len = len;
1636 buf->tail[0].iov_len = 0;
1637 buf->page_len = 0;
1638 buf->flags = 0;
1639 buf->len = 0;
1640 buf->buflen = len;
1641}
1642
1643
1644
1645
1646static void
1647rpc_xdr_encode(struct rpc_task *task)
1648{
1649 struct rpc_rqst *req = task->tk_rqstp;
1650 kxdreproc_t encode;
1651 __be32 *p;
1652
1653 dprint_status(task);
1654
1655 rpc_xdr_buf_init(&req->rq_snd_buf,
1656 req->rq_buffer,
1657 req->rq_callsize);
1658 rpc_xdr_buf_init(&req->rq_rcv_buf,
1659 (char *)req->rq_buffer + req->rq_callsize,
1660 req->rq_rcvsize);
1661
1662 p = rpc_encode_header(task);
1663 if (p == NULL) {
1664 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1665 rpc_exit(task, -EIO);
1666 return;
1667 }
1668
1669 encode = task->tk_msg.rpc_proc->p_encode;
1670 if (encode == NULL)
1671 return;
1672
1673 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1674 task->tk_msg.rpc_argp);
1675}
1676
1677
1678
1679
1680static void
1681call_bind(struct rpc_task *task)
1682{
1683 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1684
1685 dprint_status(task);
1686
1687 task->tk_action = call_connect;
1688 if (!xprt_bound(xprt)) {
1689 task->tk_action = call_bind_status;
1690 task->tk_timeout = xprt->bind_timeout;
1691 xprt->ops->rpcbind(task);
1692 }
1693}
1694
1695
1696
1697
1698static void
1699call_bind_status(struct rpc_task *task)
1700{
1701 int status = -EIO;
1702
1703 if (task->tk_status >= 0) {
1704 dprint_status(task);
1705 task->tk_status = 0;
1706 task->tk_action = call_connect;
1707 return;
1708 }
1709
1710 trace_rpc_bind_status(task);
1711 switch (task->tk_status) {
1712 case -ENOMEM:
1713 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1714 rpc_delay(task, HZ >> 2);
1715 goto retry_timeout;
1716 case -EACCES:
1717 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1718 "unavailable\n", task->tk_pid);
1719
1720 if (task->tk_msg.rpc_proc->p_proc == 0) {
1721 status = -EOPNOTSUPP;
1722 break;
1723 }
1724 if (task->tk_rebind_retry == 0)
1725 break;
1726 task->tk_rebind_retry--;
1727 rpc_delay(task, 3*HZ);
1728 goto retry_timeout;
1729 case -ETIMEDOUT:
1730 dprintk("RPC: %5u rpcbind request timed out\n",
1731 task->tk_pid);
1732 goto retry_timeout;
1733 case -EPFNOSUPPORT:
1734
1735 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1736 task->tk_pid);
1737 break;
1738 case -EPROTONOSUPPORT:
1739 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1740 task->tk_pid);
1741 goto retry_timeout;
1742 case -ECONNREFUSED:
1743 case -ECONNRESET:
1744 case -ECONNABORTED:
1745 case -ENOTCONN:
1746 case -EHOSTDOWN:
1747 case -EHOSTUNREACH:
1748 case -ENETUNREACH:
1749 case -EPIPE:
1750 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1751 task->tk_pid, task->tk_status);
1752 if (!RPC_IS_SOFTCONN(task)) {
1753 rpc_delay(task, 5*HZ);
1754 goto retry_timeout;
1755 }
1756 status = task->tk_status;
1757 break;
1758 default:
1759 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1760 task->tk_pid, -task->tk_status);
1761 }
1762
1763 rpc_exit(task, status);
1764 return;
1765
1766retry_timeout:
1767 task->tk_status = 0;
1768 task->tk_action = call_timeout;
1769}
1770
1771
1772
1773
1774static void
1775call_connect(struct rpc_task *task)
1776{
1777 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1778
1779 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1780 task->tk_pid, xprt,
1781 (xprt_connected(xprt) ? "is" : "is not"));
1782
1783 task->tk_action = call_transmit;
1784 if (!xprt_connected(xprt)) {
1785 task->tk_action = call_connect_status;
1786 if (task->tk_status < 0)
1787 return;
1788 if (task->tk_flags & RPC_TASK_NOCONNECT) {
1789 rpc_exit(task, -ENOTCONN);
1790 return;
1791 }
1792 xprt_connect(task);
1793 }
1794}
1795
1796
1797
1798
1799static void
1800call_connect_status(struct rpc_task *task)
1801{
1802 struct rpc_clnt *clnt = task->tk_client;
1803 int status = task->tk_status;
1804
1805 dprint_status(task);
1806
1807 trace_rpc_connect_status(task, status);
1808 task->tk_status = 0;
1809 switch (status) {
1810 case -ECONNREFUSED:
1811 case -ECONNRESET:
1812 case -ECONNABORTED:
1813 case -ENETUNREACH:
1814 case -EHOSTUNREACH:
1815 if (RPC_IS_SOFTCONN(task))
1816 break;
1817
1818 rpc_delay(task, 3*HZ);
1819 case -EAGAIN:
1820
1821 case -ETIMEDOUT:
1822 task->tk_action = call_timeout;
1823 return;
1824 case 0:
1825 clnt->cl_stats->netreconn++;
1826 task->tk_action = call_transmit;
1827 return;
1828 }
1829 rpc_exit(task, status);
1830}
1831
1832
1833
1834
1835static void
1836call_transmit(struct rpc_task *task)
1837{
1838 int is_retrans = RPC_WAS_SENT(task);
1839
1840 dprint_status(task);
1841
1842 task->tk_action = call_status;
1843 if (task->tk_status < 0)
1844 return;
1845 if (!xprt_prepare_transmit(task))
1846 return;
1847 task->tk_action = call_transmit_status;
1848
1849 if (rpc_task_need_encode(task)) {
1850 rpc_xdr_encode(task);
1851
1852 if (task->tk_status != 0) {
1853
1854 if (task->tk_status == -EAGAIN)
1855 rpc_delay(task, HZ >> 4);
1856 else
1857 rpc_exit(task, task->tk_status);
1858 return;
1859 }
1860 }
1861 xprt_transmit(task);
1862 if (task->tk_status < 0)
1863 return;
1864 if (is_retrans)
1865 task->tk_client->cl_stats->rpcretrans++;
1866
1867
1868
1869
1870 call_transmit_status(task);
1871 if (rpc_reply_expected(task))
1872 return;
1873 task->tk_action = rpc_exit_task;
1874 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1875}
1876
1877
1878
1879
1880static void
1881call_transmit_status(struct rpc_task *task)
1882{
1883 task->tk_action = call_status;
1884
1885
1886
1887
1888
1889 if (task->tk_status == 0) {
1890 xprt_end_transmit(task);
1891 rpc_task_force_reencode(task);
1892 return;
1893 }
1894
1895 switch (task->tk_status) {
1896 case -EAGAIN:
1897 break;
1898 default:
1899 dprint_status(task);
1900 xprt_end_transmit(task);
1901 rpc_task_force_reencode(task);
1902 break;
1903
1904
1905
1906
1907
1908
1909 case -ECONNREFUSED:
1910 case -EHOSTDOWN:
1911 case -EHOSTUNREACH:
1912 case -ENETUNREACH:
1913 if (RPC_IS_SOFTCONN(task)) {
1914 xprt_end_transmit(task);
1915 rpc_exit(task, task->tk_status);
1916 break;
1917 }
1918 case -ECONNRESET:
1919 case -ECONNABORTED:
1920 case -ENOTCONN:
1921 case -EPIPE:
1922 rpc_task_force_reencode(task);
1923 }
1924}
1925
1926#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1927
1928
1929
1930
1931static void
1932call_bc_transmit(struct rpc_task *task)
1933{
1934 struct rpc_rqst *req = task->tk_rqstp;
1935
1936 if (!xprt_prepare_transmit(task)) {
1937
1938
1939
1940
1941 task->tk_status = 0;
1942 task->tk_action = call_bc_transmit;
1943 return;
1944 }
1945
1946 task->tk_action = rpc_exit_task;
1947 if (task->tk_status < 0) {
1948 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1949 "error: %d\n", task->tk_status);
1950 return;
1951 }
1952
1953 xprt_transmit(task);
1954 xprt_end_transmit(task);
1955 dprint_status(task);
1956 switch (task->tk_status) {
1957 case 0:
1958
1959 break;
1960 case -EHOSTDOWN:
1961 case -EHOSTUNREACH:
1962 case -ENETUNREACH:
1963 case -ETIMEDOUT:
1964
1965
1966
1967
1968
1969
1970
1971 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1972 "error: %d\n", task->tk_status);
1973 xprt_conditional_disconnect(req->rq_xprt,
1974 req->rq_connect_cookie);
1975 break;
1976 default:
1977
1978
1979
1980
1981 WARN_ON_ONCE(task->tk_status == -EAGAIN);
1982 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1983 "error: %d\n", task->tk_status);
1984 break;
1985 }
1986 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1987}
1988#endif
1989
1990
1991
1992
1993static void
1994call_status(struct rpc_task *task)
1995{
1996 struct rpc_clnt *clnt = task->tk_client;
1997 struct rpc_rqst *req = task->tk_rqstp;
1998 int status;
1999
2000 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
2001 task->tk_status = req->rq_reply_bytes_recvd;
2002
2003 dprint_status(task);
2004
2005 status = task->tk_status;
2006 if (status >= 0) {
2007 task->tk_action = call_decode;
2008 return;
2009 }
2010
2011 trace_rpc_call_status(task);
2012 task->tk_status = 0;
2013 switch(status) {
2014 case -EHOSTDOWN:
2015 case -EHOSTUNREACH:
2016 case -ENETUNREACH:
2017 if (RPC_IS_SOFTCONN(task)) {
2018 rpc_exit(task, status);
2019 break;
2020 }
2021
2022
2023
2024
2025 rpc_delay(task, 3*HZ);
2026 case -ETIMEDOUT:
2027 task->tk_action = call_timeout;
2028 if (!(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT)
2029 && task->tk_client->cl_discrtry)
2030 xprt_conditional_disconnect(req->rq_xprt,
2031 req->rq_connect_cookie);
2032 break;
2033 case -ECONNREFUSED:
2034 case -ECONNRESET:
2035 case -ECONNABORTED:
2036 rpc_force_rebind(clnt);
2037 rpc_delay(task, 3*HZ);
2038 case -EPIPE:
2039 case -ENOTCONN:
2040 task->tk_action = call_bind;
2041 break;
2042 case -EAGAIN:
2043 task->tk_action = call_transmit;
2044 break;
2045 case -EIO:
2046
2047 rpc_exit(task, status);
2048 break;
2049 default:
2050 if (clnt->cl_chatty)
2051 printk("%s: RPC call returned error %d\n",
2052 clnt->cl_program->name, -status);
2053 rpc_exit(task, status);
2054 }
2055}
2056
2057
2058
2059
2060
2061
2062static void
2063call_timeout(struct rpc_task *task)
2064{
2065 struct rpc_clnt *clnt = task->tk_client;
2066
2067 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
2068 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
2069 goto retry;
2070 }
2071
2072 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
2073 task->tk_timeouts++;
2074
2075 if (RPC_IS_SOFTCONN(task)) {
2076 rpc_exit(task, -ETIMEDOUT);
2077 return;
2078 }
2079 if (RPC_IS_SOFT(task)) {
2080 if (clnt->cl_chatty) {
2081 rcu_read_lock();
2082 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
2083 clnt->cl_program->name,
2084 rcu_dereference(clnt->cl_xprt)->servername);
2085 rcu_read_unlock();
2086 }
2087 if (task->tk_flags & RPC_TASK_TIMEOUT)
2088 rpc_exit(task, -ETIMEDOUT);
2089 else
2090 rpc_exit(task, -EIO);
2091 return;
2092 }
2093
2094 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
2095 task->tk_flags |= RPC_CALL_MAJORSEEN;
2096 if (clnt->cl_chatty) {
2097 rcu_read_lock();
2098 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
2099 clnt->cl_program->name,
2100 rcu_dereference(clnt->cl_xprt)->servername);
2101 rcu_read_unlock();
2102 }
2103 }
2104 rpc_force_rebind(clnt);
2105
2106
2107
2108
2109 rpcauth_invalcred(task);
2110
2111retry:
2112 task->tk_action = call_bind;
2113 task->tk_status = 0;
2114}
2115
2116
2117
2118
2119static void
2120call_decode(struct rpc_task *task)
2121{
2122 struct rpc_clnt *clnt = task->tk_client;
2123 struct rpc_rqst *req = task->tk_rqstp;
2124 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
2125 __be32 *p;
2126
2127 dprint_status(task);
2128
2129 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
2130 if (clnt->cl_chatty) {
2131 rcu_read_lock();
2132 printk(KERN_NOTICE "%s: server %s OK\n",
2133 clnt->cl_program->name,
2134 rcu_dereference(clnt->cl_xprt)->servername);
2135 rcu_read_unlock();
2136 }
2137 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
2138 }
2139
2140
2141
2142
2143
2144 smp_rmb();
2145 req->rq_rcv_buf.len = req->rq_private_buf.len;
2146
2147
2148 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2149 sizeof(req->rq_rcv_buf)) != 0);
2150
2151 if (req->rq_rcv_buf.len < 12) {
2152 if (!RPC_IS_SOFT(task)) {
2153 task->tk_action = call_bind;
2154 goto out_retry;
2155 }
2156 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
2157 clnt->cl_program->name, task->tk_status);
2158 task->tk_action = call_timeout;
2159 goto out_retry;
2160 }
2161
2162 p = rpc_verify_header(task);
2163 if (IS_ERR(p)) {
2164 if (p == ERR_PTR(-EAGAIN))
2165 goto out_retry;
2166 return;
2167 }
2168
2169 task->tk_action = rpc_exit_task;
2170
2171 if (decode) {
2172 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
2173 task->tk_msg.rpc_resp);
2174 }
2175 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
2176 task->tk_status);
2177 return;
2178out_retry:
2179 task->tk_status = 0;
2180
2181 if (task->tk_rqstp == req) {
2182 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
2183 if (task->tk_client->cl_discrtry)
2184 xprt_conditional_disconnect(req->rq_xprt,
2185 req->rq_connect_cookie);
2186 }
2187}
2188
2189static __be32 *
2190rpc_encode_header(struct rpc_task *task)
2191{
2192 struct rpc_clnt *clnt = task->tk_client;
2193 struct rpc_rqst *req = task->tk_rqstp;
2194 __be32 *p = req->rq_svec[0].iov_base;
2195
2196
2197
2198 p = xprt_skip_transport_header(req->rq_xprt, p);
2199 *p++ = req->rq_xid;
2200 *p++ = htonl(RPC_CALL);
2201 *p++ = htonl(RPC_VERSION);
2202 *p++ = htonl(clnt->cl_prog);
2203 *p++ = htonl(clnt->cl_vers);
2204 *p++ = htonl(task->tk_msg.rpc_proc->p_proc);
2205 p = rpcauth_marshcred(task, p);
2206 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2207 return p;
2208}
2209
2210static __be32 *
2211rpc_verify_header(struct rpc_task *task)
2212{
2213 struct rpc_clnt *clnt = task->tk_client;
2214 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2215 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2216 __be32 *p = iov->iov_base;
2217 u32 n;
2218 int error = -EACCES;
2219
2220 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2221
2222
2223
2224
2225
2226 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2227 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2228 task->tk_rqstp->rq_rcv_buf.len);
2229 error = -EIO;
2230 goto out_err;
2231 }
2232 if ((len -= 3) < 0)
2233 goto out_overflow;
2234
2235 p += 1;
2236 if ((n = ntohl(*p++)) != RPC_REPLY) {
2237 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2238 task->tk_pid, __func__, n);
2239 error = -EIO;
2240 goto out_garbage;
2241 }
2242
2243 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2244 if (--len < 0)
2245 goto out_overflow;
2246 switch ((n = ntohl(*p++))) {
2247 case RPC_AUTH_ERROR:
2248 break;
2249 case RPC_MISMATCH:
2250 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2251 task->tk_pid, __func__);
2252 error = -EPROTONOSUPPORT;
2253 goto out_err;
2254 default:
2255 dprintk("RPC: %5u %s: RPC call rejected, "
2256 "unknown error: %x\n",
2257 task->tk_pid, __func__, n);
2258 error = -EIO;
2259 goto out_err;
2260 }
2261 if (--len < 0)
2262 goto out_overflow;
2263 switch ((n = ntohl(*p++))) {
2264 case RPC_AUTH_REJECTEDCRED:
2265 case RPC_AUTH_REJECTEDVERF:
2266 case RPCSEC_GSS_CREDPROBLEM:
2267 case RPCSEC_GSS_CTXPROBLEM:
2268 if (!task->tk_cred_retry)
2269 break;
2270 task->tk_cred_retry--;
2271 dprintk("RPC: %5u %s: retry stale creds\n",
2272 task->tk_pid, __func__);
2273 rpcauth_invalcred(task);
2274
2275 xprt_release(task);
2276 task->tk_action = call_reserve;
2277 goto out_retry;
2278 case RPC_AUTH_BADCRED:
2279 case RPC_AUTH_BADVERF:
2280
2281 if (!task->tk_garb_retry)
2282 break;
2283 task->tk_garb_retry--;
2284 dprintk("RPC: %5u %s: retry garbled creds\n",
2285 task->tk_pid, __func__);
2286 task->tk_action = call_bind;
2287 goto out_retry;
2288 case RPC_AUTH_TOOWEAK:
2289 rcu_read_lock();
2290 printk(KERN_NOTICE "RPC: server %s requires stronger "
2291 "authentication.\n",
2292 rcu_dereference(clnt->cl_xprt)->servername);
2293 rcu_read_unlock();
2294 break;
2295 default:
2296 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2297 task->tk_pid, __func__, n);
2298 error = -EIO;
2299 }
2300 dprintk("RPC: %5u %s: call rejected %d\n",
2301 task->tk_pid, __func__, n);
2302 goto out_err;
2303 }
2304 p = rpcauth_checkverf(task, p);
2305 if (IS_ERR(p)) {
2306 error = PTR_ERR(p);
2307 dprintk("RPC: %5u %s: auth check failed with %d\n",
2308 task->tk_pid, __func__, error);
2309 goto out_garbage;
2310 }
2311 len = p - (__be32 *)iov->iov_base - 1;
2312 if (len < 0)
2313 goto out_overflow;
2314 switch ((n = ntohl(*p++))) {
2315 case RPC_SUCCESS:
2316 return p;
2317 case RPC_PROG_UNAVAIL:
2318 dprintk_rcu("RPC: %5u %s: program %u is unsupported "
2319 "by server %s\n", task->tk_pid, __func__,
2320 (unsigned int)clnt->cl_prog,
2321 rcu_dereference(clnt->cl_xprt)->servername);
2322 error = -EPFNOSUPPORT;
2323 goto out_err;
2324 case RPC_PROG_MISMATCH:
2325 dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
2326 "by server %s\n", task->tk_pid, __func__,
2327 (unsigned int)clnt->cl_prog,
2328 (unsigned int)clnt->cl_vers,
2329 rcu_dereference(clnt->cl_xprt)->servername);
2330 error = -EPROTONOSUPPORT;
2331 goto out_err;
2332 case RPC_PROC_UNAVAIL:
2333 dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
2334 "version %u on server %s\n",
2335 task->tk_pid, __func__,
2336 rpc_proc_name(task),
2337 clnt->cl_prog, clnt->cl_vers,
2338 rcu_dereference(clnt->cl_xprt)->servername);
2339 error = -EOPNOTSUPP;
2340 goto out_err;
2341 case RPC_GARBAGE_ARGS:
2342 dprintk("RPC: %5u %s: server saw garbage\n",
2343 task->tk_pid, __func__);
2344 break;
2345 default:
2346 dprintk("RPC: %5u %s: server accept status: %x\n",
2347 task->tk_pid, __func__, n);
2348
2349 }
2350
2351out_garbage:
2352 clnt->cl_stats->rpcgarbage++;
2353 if (task->tk_garb_retry) {
2354 task->tk_garb_retry--;
2355 dprintk("RPC: %5u %s: retrying\n",
2356 task->tk_pid, __func__);
2357 task->tk_action = call_bind;
2358out_retry:
2359 return ERR_PTR(-EAGAIN);
2360 }
2361out_err:
2362 rpc_exit(task, error);
2363 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2364 __func__, error);
2365 return ERR_PTR(error);
2366out_overflow:
2367 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2368 __func__);
2369 goto out_garbage;
2370}
2371
2372static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2373{
2374}
2375
2376static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2377{
2378 return 0;
2379}
2380
2381static struct rpc_procinfo rpcproc_null = {
2382 .p_encode = rpcproc_encode_null,
2383 .p_decode = rpcproc_decode_null,
2384};
2385
2386static int rpc_ping(struct rpc_clnt *clnt)
2387{
2388 struct rpc_message msg = {
2389 .rpc_proc = &rpcproc_null,
2390 };
2391 int err;
2392 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2393 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2394 put_rpccred(msg.rpc_cred);
2395 return err;
2396}
2397
2398struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2399{
2400 struct rpc_message msg = {
2401 .rpc_proc = &rpcproc_null,
2402 .rpc_cred = cred,
2403 };
2404 struct rpc_task_setup task_setup_data = {
2405 .rpc_client = clnt,
2406 .rpc_message = &msg,
2407 .callback_ops = &rpc_default_ops,
2408 .flags = flags,
2409 };
2410 return rpc_run_task(&task_setup_data);
2411}
2412EXPORT_SYMBOL_GPL(rpc_call_null);
2413
2414#ifdef RPC_DEBUG
2415static void rpc_show_header(void)
2416{
2417 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2418 "-timeout ---ops--\n");
2419}
2420
2421static void rpc_show_task(const struct rpc_clnt *clnt,
2422 const struct rpc_task *task)
2423{
2424 const char *rpc_waitq = "none";
2425
2426 if (RPC_IS_QUEUED(task))
2427 rpc_waitq = rpc_qname(task->tk_waitqueue);
2428
2429 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2430 task->tk_pid, task->tk_flags, task->tk_status,
2431 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2432 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
2433 task->tk_action, rpc_waitq);
2434}
2435
2436void rpc_show_tasks(struct net *net)
2437{
2438 struct rpc_clnt *clnt;
2439 struct rpc_task *task;
2440 int header = 0;
2441 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2442
2443 spin_lock(&sn->rpc_client_lock);
2444 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2445 spin_lock(&clnt->cl_lock);
2446 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2447 if (!header) {
2448 rpc_show_header();
2449 header++;
2450 }
2451 rpc_show_task(clnt, task);
2452 }
2453 spin_unlock(&clnt->cl_lock);
2454 }
2455 spin_unlock(&sn->rpc_client_lock);
2456}
2457#endif
2458