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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 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 = strlcpy(clnt->cl_nodename,
290 nodename, sizeof(clnt->cl_nodename));
291}
292
293static int rpc_client_register(struct rpc_clnt *clnt,
294 rpc_authflavor_t pseudoflavor,
295 const char *client_name)
296{
297 struct rpc_auth_create_args auth_args = {
298 .pseudoflavor = pseudoflavor,
299 .target_name = client_name,
300 };
301 struct rpc_auth *auth;
302 struct net *net = rpc_net_ns(clnt);
303 struct super_block *pipefs_sb;
304 int err;
305
306 rpc_clnt_debugfs_register(clnt);
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 rpc_clnt_debugfs_unregister(clnt);
335 return err;
336}
337
338static DEFINE_IDA(rpc_clids);
339
340static int rpc_alloc_clid(struct rpc_clnt *clnt)
341{
342 int clid;
343
344 clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
345 if (clid < 0)
346 return clid;
347 clnt->cl_clid = clid;
348 return 0;
349}
350
351static void rpc_free_clid(struct rpc_clnt *clnt)
352{
353 ida_simple_remove(&rpc_clids, clnt->cl_clid);
354}
355
356static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
357 struct rpc_xprt *xprt,
358 struct rpc_clnt *parent)
359{
360 const struct rpc_program *program = args->program;
361 const struct rpc_version *version;
362 struct rpc_clnt *clnt = NULL;
363 const struct rpc_timeout *timeout;
364 const char *nodename = args->nodename;
365 int err;
366
367
368 dprintk("RPC: creating %s client for %s (xprt %p)\n",
369 program->name, args->servername, xprt);
370
371 err = rpciod_up();
372 if (err)
373 goto out_no_rpciod;
374
375 err = -EINVAL;
376 if (args->version >= program->nrvers)
377 goto out_err;
378 version = program->version[args->version];
379 if (version == NULL)
380 goto out_err;
381
382 err = -ENOMEM;
383 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
384 if (!clnt)
385 goto out_err;
386 clnt->cl_parent = parent ? : clnt;
387
388 err = rpc_alloc_clid(clnt);
389 if (err)
390 goto out_no_clid;
391
392 clnt->cl_procinfo = version->procs;
393 clnt->cl_maxproc = version->nrprocs;
394 clnt->cl_prog = args->prognumber ? : program->number;
395 clnt->cl_vers = version->number;
396 clnt->cl_stats = program->stats;
397 clnt->cl_metrics = rpc_alloc_iostats(clnt);
398 rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
399 err = -ENOMEM;
400 if (clnt->cl_metrics == NULL)
401 goto out_no_stats;
402 clnt->cl_program = program;
403 INIT_LIST_HEAD(&clnt->cl_tasks);
404 spin_lock_init(&clnt->cl_lock);
405
406 timeout = xprt->timeout;
407 if (args->timeout != NULL) {
408 memcpy(&clnt->cl_timeout_default, args->timeout,
409 sizeof(clnt->cl_timeout_default));
410 timeout = &clnt->cl_timeout_default;
411 }
412
413 rpc_clnt_set_transport(clnt, xprt, timeout);
414
415 clnt->cl_rtt = &clnt->cl_rtt_default;
416 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
417
418 atomic_set(&clnt->cl_count, 1);
419
420 if (nodename == NULL)
421 nodename = utsname()->nodename;
422
423 rpc_clnt_set_nodename(clnt, nodename);
424
425 err = rpc_client_register(clnt, args->authflavor, args->client_name);
426 if (err)
427 goto out_no_path;
428 if (parent)
429 atomic_inc(&parent->cl_count);
430 return clnt;
431
432out_no_path:
433 rpc_free_iostats(clnt->cl_metrics);
434out_no_stats:
435 rpc_free_clid(clnt);
436out_no_clid:
437 kfree(clnt);
438out_err:
439 rpciod_down();
440out_no_rpciod:
441 xprt_put(xprt);
442 return ERR_PTR(err);
443}
444
445struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
446 struct rpc_xprt *xprt)
447{
448 struct rpc_clnt *clnt = NULL;
449
450 clnt = rpc_new_client(args, xprt, NULL);
451 if (IS_ERR(clnt))
452 return clnt;
453
454 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
455 int err = rpc_ping(clnt);
456 if (err != 0) {
457 rpc_shutdown_client(clnt);
458 return ERR_PTR(err);
459 }
460 }
461
462 clnt->cl_softrtry = 1;
463 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
464 clnt->cl_softrtry = 0;
465
466 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
467 clnt->cl_autobind = 1;
468 if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
469 clnt->cl_noretranstimeo = 1;
470 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
471 clnt->cl_discrtry = 1;
472 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
473 clnt->cl_chatty = 1;
474
475 return clnt;
476}
477EXPORT_SYMBOL_GPL(rpc_create_xprt);
478
479
480
481
482
483
484
485
486
487
488
489struct rpc_clnt *rpc_create(struct rpc_create_args *args)
490{
491 struct rpc_xprt *xprt;
492 struct xprt_create xprtargs = {
493 .net = args->net,
494 .ident = args->protocol,
495 .srcaddr = args->saddress,
496 .dstaddr = args->address,
497 .addrlen = args->addrsize,
498 .servername = args->servername,
499 .bc_xprt = args->bc_xprt,
500 };
501 char servername[48];
502
503 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
504 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
505 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
506 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
507
508
509
510
511 if (xprtargs.servername == NULL) {
512 struct sockaddr_un *sun =
513 (struct sockaddr_un *)args->address;
514 struct sockaddr_in *sin =
515 (struct sockaddr_in *)args->address;
516 struct sockaddr_in6 *sin6 =
517 (struct sockaddr_in6 *)args->address;
518
519 servername[0] = '\0';
520 switch (args->address->sa_family) {
521 case AF_LOCAL:
522 snprintf(servername, sizeof(servername), "%s",
523 sun->sun_path);
524 break;
525 case AF_INET:
526 snprintf(servername, sizeof(servername), "%pI4",
527 &sin->sin_addr.s_addr);
528 break;
529 case AF_INET6:
530 snprintf(servername, sizeof(servername), "%pI6",
531 &sin6->sin6_addr);
532 break;
533 default:
534
535
536 return ERR_PTR(-EINVAL);
537 }
538 xprtargs.servername = servername;
539 }
540
541 xprt = xprt_create_transport(&xprtargs);
542 if (IS_ERR(xprt))
543 return (struct rpc_clnt *)xprt;
544
545
546
547
548
549
550
551 xprt->resvport = 1;
552 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
553 xprt->resvport = 0;
554
555 return rpc_create_xprt(args, xprt);
556}
557EXPORT_SYMBOL_GPL(rpc_create);
558
559
560
561
562
563
564static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
565 struct rpc_clnt *clnt)
566{
567 struct rpc_xprt *xprt;
568 struct rpc_clnt *new;
569 int err;
570
571 err = -ENOMEM;
572 rcu_read_lock();
573 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
574 rcu_read_unlock();
575 if (xprt == NULL)
576 goto out_err;
577 args->servername = xprt->servername;
578 args->nodename = clnt->cl_nodename;
579
580 new = rpc_new_client(args, xprt, clnt);
581 if (IS_ERR(new)) {
582 err = PTR_ERR(new);
583 goto out_err;
584 }
585
586
587 new->cl_autobind = 0;
588 new->cl_softrtry = clnt->cl_softrtry;
589 new->cl_noretranstimeo = clnt->cl_noretranstimeo;
590 new->cl_discrtry = clnt->cl_discrtry;
591 new->cl_chatty = clnt->cl_chatty;
592 return new;
593
594out_err:
595 dprintk("RPC: %s: returned error %d\n", __func__, err);
596 return ERR_PTR(err);
597}
598
599
600
601
602
603
604
605
606struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
607{
608 struct rpc_create_args args = {
609 .program = clnt->cl_program,
610 .prognumber = clnt->cl_prog,
611 .version = clnt->cl_vers,
612 .authflavor = clnt->cl_auth->au_flavor,
613 };
614 return __rpc_clone_client(&args, clnt);
615}
616EXPORT_SYMBOL_GPL(rpc_clone_client);
617
618
619
620
621
622
623
624
625
626struct rpc_clnt *
627rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
628{
629 struct rpc_create_args args = {
630 .program = clnt->cl_program,
631 .prognumber = clnt->cl_prog,
632 .version = clnt->cl_vers,
633 .authflavor = flavor,
634 };
635 return __rpc_clone_client(&args, clnt);
636}
637EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654int rpc_switch_client_transport(struct rpc_clnt *clnt,
655 struct xprt_create *args,
656 const struct rpc_timeout *timeout)
657{
658 const struct rpc_timeout *old_timeo;
659 rpc_authflavor_t pseudoflavor;
660 struct rpc_xprt *xprt, *old;
661 struct rpc_clnt *parent;
662 int err;
663
664 xprt = xprt_create_transport(args);
665 if (IS_ERR(xprt)) {
666 dprintk("RPC: failed to create new xprt for clnt %p\n",
667 clnt);
668 return PTR_ERR(xprt);
669 }
670
671 pseudoflavor = clnt->cl_auth->au_flavor;
672
673 old_timeo = clnt->cl_timeout;
674 old = rpc_clnt_set_transport(clnt, xprt, timeout);
675
676 rpc_unregister_client(clnt);
677 __rpc_clnt_remove_pipedir(clnt);
678 rpc_clnt_debugfs_unregister(clnt);
679
680
681
682
683
684
685 parent = clnt->cl_parent;
686 clnt->cl_parent = clnt;
687
688
689
690
691
692
693 err = rpc_client_register(clnt, pseudoflavor, NULL);
694 if (err)
695 goto out_revert;
696
697 synchronize_rcu();
698 if (parent != clnt)
699 rpc_release_client(parent);
700 xprt_put(old);
701 dprintk("RPC: replaced xprt for clnt %p\n", clnt);
702 return 0;
703
704out_revert:
705 rpc_clnt_set_transport(clnt, old, old_timeo);
706 clnt->cl_parent = parent;
707 rpc_client_register(clnt, pseudoflavor, NULL);
708 xprt_put(xprt);
709 dprintk("RPC: failed to switch xprt for clnt %p\n", clnt);
710 return err;
711}
712EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
713
714
715
716
717
718void rpc_killall_tasks(struct rpc_clnt *clnt)
719{
720 struct rpc_task *rovr;
721
722
723 if (list_empty(&clnt->cl_tasks))
724 return;
725 dprintk("RPC: killing all tasks for client %p\n", clnt);
726
727
728
729 spin_lock(&clnt->cl_lock);
730 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
731 if (!RPC_IS_ACTIVATED(rovr))
732 continue;
733 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
734 rovr->tk_flags |= RPC_TASK_KILLED;
735 rpc_exit(rovr, -EIO);
736 if (RPC_IS_QUEUED(rovr))
737 rpc_wake_up_queued_task(rovr->tk_waitqueue,
738 rovr);
739 }
740 }
741 spin_unlock(&clnt->cl_lock);
742}
743EXPORT_SYMBOL_GPL(rpc_killall_tasks);
744
745
746
747
748
749void rpc_shutdown_client(struct rpc_clnt *clnt)
750{
751 might_sleep();
752
753 dprintk_rcu("RPC: shutting down %s client for %s\n",
754 clnt->cl_program->name,
755 rcu_dereference(clnt->cl_xprt)->servername);
756
757 while (!list_empty(&clnt->cl_tasks)) {
758 rpc_killall_tasks(clnt);
759 wait_event_timeout(destroy_wait,
760 list_empty(&clnt->cl_tasks), 1*HZ);
761 }
762
763 rpc_release_client(clnt);
764}
765EXPORT_SYMBOL_GPL(rpc_shutdown_client);
766
767
768
769
770static struct rpc_clnt *
771rpc_free_client(struct rpc_clnt *clnt)
772{
773 struct rpc_clnt *parent = NULL;
774
775 dprintk_rcu("RPC: destroying %s client for %s\n",
776 clnt->cl_program->name,
777 rcu_dereference(clnt->cl_xprt)->servername);
778 if (clnt->cl_parent != clnt)
779 parent = clnt->cl_parent;
780 rpc_clnt_debugfs_unregister(clnt);
781 rpc_clnt_remove_pipedir(clnt);
782 rpc_unregister_client(clnt);
783 rpc_free_iostats(clnt->cl_metrics);
784 clnt->cl_metrics = NULL;
785 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
786 rpciod_down();
787 rpc_free_clid(clnt);
788 kfree(clnt);
789 return parent;
790}
791
792
793
794
795static struct rpc_clnt *
796rpc_free_auth(struct rpc_clnt *clnt)
797{
798 if (clnt->cl_auth == NULL)
799 return rpc_free_client(clnt);
800
801
802
803
804
805
806 atomic_inc(&clnt->cl_count);
807 rpcauth_release(clnt->cl_auth);
808 clnt->cl_auth = NULL;
809 if (atomic_dec_and_test(&clnt->cl_count))
810 return rpc_free_client(clnt);
811 return NULL;
812}
813
814
815
816
817void
818rpc_release_client(struct rpc_clnt *clnt)
819{
820 dprintk("RPC: rpc_release_client(%p)\n", clnt);
821
822 do {
823 if (list_empty(&clnt->cl_tasks))
824 wake_up(&destroy_wait);
825 if (!atomic_dec_and_test(&clnt->cl_count))
826 break;
827 clnt = rpc_free_auth(clnt);
828 } while (clnt != NULL);
829}
830EXPORT_SYMBOL_GPL(rpc_release_client);
831
832
833
834
835
836
837
838
839
840
841
842struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
843 const struct rpc_program *program,
844 u32 vers)
845{
846 struct rpc_create_args args = {
847 .program = program,
848 .prognumber = program->number,
849 .version = vers,
850 .authflavor = old->cl_auth->au_flavor,
851 };
852 struct rpc_clnt *clnt;
853 int err;
854
855 clnt = __rpc_clone_client(&args, old);
856 if (IS_ERR(clnt))
857 goto out;
858 err = rpc_ping(clnt);
859 if (err != 0) {
860 rpc_shutdown_client(clnt);
861 clnt = ERR_PTR(err);
862 }
863out:
864 return clnt;
865}
866EXPORT_SYMBOL_GPL(rpc_bind_new_program);
867
868void rpc_task_release_client(struct rpc_task *task)
869{
870 struct rpc_clnt *clnt = task->tk_client;
871
872 if (clnt != NULL) {
873
874 spin_lock(&clnt->cl_lock);
875 list_del(&task->tk_task);
876 spin_unlock(&clnt->cl_lock);
877 task->tk_client = NULL;
878
879 rpc_release_client(clnt);
880 }
881}
882
883static
884void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
885{
886 if (clnt != NULL) {
887 rpc_task_release_client(task);
888 task->tk_client = clnt;
889 atomic_inc(&clnt->cl_count);
890 if (clnt->cl_softrtry)
891 task->tk_flags |= RPC_TASK_SOFT;
892 if (clnt->cl_noretranstimeo)
893 task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
894 if (atomic_read(&clnt->cl_swapper))
895 task->tk_flags |= RPC_TASK_SWAPPER;
896
897 spin_lock(&clnt->cl_lock);
898 list_add_tail(&task->tk_task, &clnt->cl_tasks);
899 spin_unlock(&clnt->cl_lock);
900 }
901}
902
903void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
904{
905 rpc_task_release_client(task);
906 rpc_task_set_client(task, clnt);
907}
908EXPORT_SYMBOL_GPL(rpc_task_reset_client);
909
910
911static void
912rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
913{
914 if (msg != NULL) {
915 task->tk_msg.rpc_proc = msg->rpc_proc;
916 task->tk_msg.rpc_argp = msg->rpc_argp;
917 task->tk_msg.rpc_resp = msg->rpc_resp;
918 if (msg->rpc_cred != NULL)
919 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
920 }
921}
922
923
924
925
926static void
927rpc_default_callback(struct rpc_task *task, void *data)
928{
929}
930
931static const struct rpc_call_ops rpc_default_ops = {
932 .rpc_call_done = rpc_default_callback,
933};
934
935
936
937
938
939struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
940{
941 struct rpc_task *task;
942
943 task = rpc_new_task(task_setup_data);
944 if (IS_ERR(task))
945 goto out;
946
947 rpc_task_set_client(task, task_setup_data->rpc_client);
948 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
949
950 if (task->tk_action == NULL)
951 rpc_call_start(task);
952
953 atomic_inc(&task->tk_count);
954 rpc_execute(task);
955out:
956 return task;
957}
958EXPORT_SYMBOL_GPL(rpc_run_task);
959
960
961
962
963
964
965
966int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
967{
968 struct rpc_task *task;
969 struct rpc_task_setup task_setup_data = {
970 .rpc_client = clnt,
971 .rpc_message = msg,
972 .callback_ops = &rpc_default_ops,
973 .flags = flags,
974 };
975 int status;
976
977 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
978 if (flags & RPC_TASK_ASYNC) {
979 rpc_release_calldata(task_setup_data.callback_ops,
980 task_setup_data.callback_data);
981 return -EINVAL;
982 }
983
984 task = rpc_run_task(&task_setup_data);
985 if (IS_ERR(task))
986 return PTR_ERR(task);
987 status = task->tk_status;
988 rpc_put_task(task);
989 return status;
990}
991EXPORT_SYMBOL_GPL(rpc_call_sync);
992
993
994
995
996
997
998
999
1000
1001int
1002rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
1003 const struct rpc_call_ops *tk_ops, void *data)
1004{
1005 struct rpc_task *task;
1006 struct rpc_task_setup task_setup_data = {
1007 .rpc_client = clnt,
1008 .rpc_message = msg,
1009 .callback_ops = tk_ops,
1010 .callback_data = data,
1011 .flags = flags|RPC_TASK_ASYNC,
1012 };
1013
1014 task = rpc_run_task(&task_setup_data);
1015 if (IS_ERR(task))
1016 return PTR_ERR(task);
1017 rpc_put_task(task);
1018 return 0;
1019}
1020EXPORT_SYMBOL_GPL(rpc_call_async);
1021
1022#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1023
1024
1025
1026
1027
1028struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
1029{
1030 struct rpc_task *task;
1031 struct xdr_buf *xbufp = &req->rq_snd_buf;
1032 struct rpc_task_setup task_setup_data = {
1033 .callback_ops = &rpc_default_ops,
1034 .flags = RPC_TASK_SOFTCONN,
1035 };
1036
1037 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
1038
1039
1040
1041 task = rpc_new_task(&task_setup_data);
1042 if (IS_ERR(task)) {
1043 xprt_free_bc_request(req);
1044 goto out;
1045 }
1046 task->tk_rqstp = req;
1047
1048
1049
1050
1051
1052 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
1053 xbufp->tail[0].iov_len;
1054
1055 task->tk_action = call_bc_transmit;
1056 atomic_inc(&task->tk_count);
1057 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
1058 rpc_execute(task);
1059
1060out:
1061 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
1062 return task;
1063}
1064#endif
1065
1066void
1067rpc_call_start(struct rpc_task *task)
1068{
1069 task->tk_action = call_start;
1070}
1071EXPORT_SYMBOL_GPL(rpc_call_start);
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
1082{
1083 size_t bytes;
1084 struct rpc_xprt *xprt;
1085
1086 rcu_read_lock();
1087 xprt = rcu_dereference(clnt->cl_xprt);
1088
1089 bytes = xprt->addrlen;
1090 if (bytes > bufsize)
1091 bytes = bufsize;
1092 memcpy(buf, &xprt->addr, bytes);
1093 rcu_read_unlock();
1094
1095 return bytes;
1096}
1097EXPORT_SYMBOL_GPL(rpc_peeraddr);
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
1109 enum rpc_display_format_t format)
1110{
1111 struct rpc_xprt *xprt;
1112
1113 xprt = rcu_dereference(clnt->cl_xprt);
1114
1115 if (xprt->address_strings[format] != NULL)
1116 return xprt->address_strings[format];
1117 else
1118 return "unprintable";
1119}
1120EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
1121
1122static const struct sockaddr_in rpc_inaddr_loopback = {
1123 .sin_family = AF_INET,
1124 .sin_addr.s_addr = htonl(INADDR_ANY),
1125};
1126
1127static const struct sockaddr_in6 rpc_in6addr_loopback = {
1128 .sin6_family = AF_INET6,
1129 .sin6_addr = IN6ADDR_ANY_INIT,
1130};
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1141 struct sockaddr *buf, int buflen)
1142{
1143 struct socket *sock;
1144 int err;
1145
1146 err = __sock_create(net, sap->sa_family,
1147 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1148 if (err < 0) {
1149 dprintk("RPC: can't create UDP socket (%d)\n", err);
1150 goto out;
1151 }
1152
1153 switch (sap->sa_family) {
1154 case AF_INET:
1155 err = kernel_bind(sock,
1156 (struct sockaddr *)&rpc_inaddr_loopback,
1157 sizeof(rpc_inaddr_loopback));
1158 break;
1159 case AF_INET6:
1160 err = kernel_bind(sock,
1161 (struct sockaddr *)&rpc_in6addr_loopback,
1162 sizeof(rpc_in6addr_loopback));
1163 break;
1164 default:
1165 err = -EAFNOSUPPORT;
1166 goto out;
1167 }
1168 if (err < 0) {
1169 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1170 goto out_release;
1171 }
1172
1173 err = kernel_connect(sock, sap, salen, 0);
1174 if (err < 0) {
1175 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1176 goto out_release;
1177 }
1178
1179 err = kernel_getsockname(sock, buf, &buflen);
1180 if (err < 0) {
1181 dprintk("RPC: getsockname failed (%d)\n", err);
1182 goto out_release;
1183 }
1184
1185 err = 0;
1186 if (buf->sa_family == AF_INET6) {
1187 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1188 sin6->sin6_scope_id = 0;
1189 }
1190 dprintk("RPC: %s succeeded\n", __func__);
1191
1192out_release:
1193 sock_release(sock);
1194out:
1195 return err;
1196}
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1207{
1208 switch (family) {
1209 case AF_INET:
1210 if (buflen < sizeof(rpc_inaddr_loopback))
1211 return -EINVAL;
1212 memcpy(buf, &rpc_inaddr_loopback,
1213 sizeof(rpc_inaddr_loopback));
1214 break;
1215 case AF_INET6:
1216 if (buflen < sizeof(rpc_in6addr_loopback))
1217 return -EINVAL;
1218 memcpy(buf, &rpc_in6addr_loopback,
1219 sizeof(rpc_in6addr_loopback));
1220 default:
1221 dprintk("RPC: %s: address family not supported\n",
1222 __func__);
1223 return -EAFNOSUPPORT;
1224 }
1225 dprintk("RPC: %s: succeeded\n", __func__);
1226 return 0;
1227}
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1246{
1247 struct sockaddr_storage address;
1248 struct sockaddr *sap = (struct sockaddr *)&address;
1249 struct rpc_xprt *xprt;
1250 struct net *net;
1251 size_t salen;
1252 int err;
1253
1254 rcu_read_lock();
1255 xprt = rcu_dereference(clnt->cl_xprt);
1256 salen = xprt->addrlen;
1257 memcpy(sap, &xprt->addr, salen);
1258 net = get_net(xprt->xprt_net);
1259 rcu_read_unlock();
1260
1261 rpc_set_port(sap, 0);
1262 err = rpc_sockname(net, sap, salen, buf, buflen);
1263 put_net(net);
1264 if (err != 0)
1265
1266 return rpc_anyaddr(sap->sa_family, buf, buflen);
1267 return 0;
1268}
1269EXPORT_SYMBOL_GPL(rpc_localaddr);
1270
1271void
1272rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1273{
1274 struct rpc_xprt *xprt;
1275
1276 rcu_read_lock();
1277 xprt = rcu_dereference(clnt->cl_xprt);
1278 if (xprt->ops->set_buffer_size)
1279 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1280 rcu_read_unlock();
1281}
1282EXPORT_SYMBOL_GPL(rpc_setbufsize);
1283
1284
1285
1286
1287
1288
1289int rpc_protocol(struct rpc_clnt *clnt)
1290{
1291 int protocol;
1292
1293 rcu_read_lock();
1294 protocol = rcu_dereference(clnt->cl_xprt)->prot;
1295 rcu_read_unlock();
1296 return protocol;
1297}
1298EXPORT_SYMBOL_GPL(rpc_protocol);
1299
1300
1301
1302
1303
1304
1305struct net *rpc_net_ns(struct rpc_clnt *clnt)
1306{
1307 struct net *ret;
1308
1309 rcu_read_lock();
1310 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1311 rcu_read_unlock();
1312 return ret;
1313}
1314EXPORT_SYMBOL_GPL(rpc_net_ns);
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325size_t rpc_max_payload(struct rpc_clnt *clnt)
1326{
1327 size_t ret;
1328
1329 rcu_read_lock();
1330 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1331 rcu_read_unlock();
1332 return ret;
1333}
1334EXPORT_SYMBOL_GPL(rpc_max_payload);
1335
1336
1337
1338
1339
1340unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
1341{
1342 unsigned long ret;
1343
1344 rcu_read_lock();
1345 ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval;
1346 rcu_read_unlock();
1347 return ret;
1348}
1349EXPORT_SYMBOL_GPL(rpc_get_timeout);
1350
1351
1352
1353
1354
1355
1356void rpc_force_rebind(struct rpc_clnt *clnt)
1357{
1358 if (clnt->cl_autobind) {
1359 rcu_read_lock();
1360 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1361 rcu_read_unlock();
1362 }
1363}
1364EXPORT_SYMBOL_GPL(rpc_force_rebind);
1365
1366
1367
1368
1369
1370int
1371rpc_restart_call_prepare(struct rpc_task *task)
1372{
1373 if (RPC_ASSASSINATED(task))
1374 return 0;
1375 task->tk_action = call_start;
1376 task->tk_status = 0;
1377 if (task->tk_ops->rpc_call_prepare != NULL)
1378 task->tk_action = rpc_prepare_task;
1379 return 1;
1380}
1381EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1382
1383
1384
1385
1386
1387int
1388rpc_restart_call(struct rpc_task *task)
1389{
1390 if (RPC_ASSASSINATED(task))
1391 return 0;
1392 task->tk_action = call_start;
1393 task->tk_status = 0;
1394 return 1;
1395}
1396EXPORT_SYMBOL_GPL(rpc_restart_call);
1397
1398#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
1399const char
1400*rpc_proc_name(const struct rpc_task *task)
1401{
1402 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1403
1404 if (proc) {
1405 if (proc->p_name)
1406 return proc->p_name;
1407 else
1408 return "NULL";
1409 } else
1410 return "no proc";
1411}
1412#endif
1413
1414
1415
1416
1417
1418
1419
1420static void
1421call_start(struct rpc_task *task)
1422{
1423 struct rpc_clnt *clnt = task->tk_client;
1424
1425 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1426 clnt->cl_program->name, clnt->cl_vers,
1427 rpc_proc_name(task),
1428 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1429
1430
1431 task->tk_msg.rpc_proc->p_count++;
1432 clnt->cl_stats->rpccnt++;
1433 task->tk_action = call_reserve;
1434}
1435
1436
1437
1438
1439static void
1440call_reserve(struct rpc_task *task)
1441{
1442 dprint_status(task);
1443
1444 task->tk_status = 0;
1445 task->tk_action = call_reserveresult;
1446 xprt_reserve(task);
1447}
1448
1449static void call_retry_reserve(struct rpc_task *task);
1450
1451
1452
1453
1454static void
1455call_reserveresult(struct rpc_task *task)
1456{
1457 int status = task->tk_status;
1458
1459 dprint_status(task);
1460
1461
1462
1463
1464
1465 task->tk_status = 0;
1466 if (status >= 0) {
1467 if (task->tk_rqstp) {
1468 task->tk_action = call_refresh;
1469 return;
1470 }
1471
1472 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1473 __func__, status);
1474 rpc_exit(task, -EIO);
1475 return;
1476 }
1477
1478
1479
1480
1481
1482 if (task->tk_rqstp) {
1483 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1484 __func__, status);
1485 xprt_release(task);
1486 }
1487
1488 switch (status) {
1489 case -ENOMEM:
1490 rpc_delay(task, HZ >> 2);
1491 case -EAGAIN:
1492 task->tk_action = call_retry_reserve;
1493 return;
1494 case -EIO:
1495 break;
1496 default:
1497 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1498 __func__, status);
1499 break;
1500 }
1501 rpc_exit(task, status);
1502}
1503
1504
1505
1506
1507static void
1508call_retry_reserve(struct rpc_task *task)
1509{
1510 dprint_status(task);
1511
1512 task->tk_status = 0;
1513 task->tk_action = call_reserveresult;
1514 xprt_retry_reserve(task);
1515}
1516
1517
1518
1519
1520static void
1521call_refresh(struct rpc_task *task)
1522{
1523 dprint_status(task);
1524
1525 task->tk_action = call_refreshresult;
1526 task->tk_status = 0;
1527 task->tk_client->cl_stats->rpcauthrefresh++;
1528 rpcauth_refreshcred(task);
1529}
1530
1531
1532
1533
1534static void
1535call_refreshresult(struct rpc_task *task)
1536{
1537 int status = task->tk_status;
1538
1539 dprint_status(task);
1540
1541 task->tk_status = 0;
1542 task->tk_action = call_refresh;
1543 switch (status) {
1544 case 0:
1545 if (rpcauth_uptodatecred(task)) {
1546 task->tk_action = call_allocate;
1547 return;
1548 }
1549
1550
1551
1552 case -ETIMEDOUT:
1553 rpc_delay(task, 3*HZ);
1554 case -EAGAIN:
1555 status = -EACCES;
1556 case -EKEYEXPIRED:
1557 if (!task->tk_cred_retry)
1558 break;
1559 task->tk_cred_retry--;
1560 dprintk("RPC: %5u %s: retry refresh creds\n",
1561 task->tk_pid, __func__);
1562 return;
1563 }
1564 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1565 task->tk_pid, __func__, status);
1566 rpc_exit(task, status);
1567}
1568
1569
1570
1571
1572
1573static void
1574call_allocate(struct rpc_task *task)
1575{
1576 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1577 struct rpc_rqst *req = task->tk_rqstp;
1578 struct rpc_xprt *xprt = req->rq_xprt;
1579 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1580
1581 dprint_status(task);
1582
1583 task->tk_status = 0;
1584 task->tk_action = call_bind;
1585
1586 if (req->rq_buffer)
1587 return;
1588
1589 if (proc->p_proc != 0) {
1590 BUG_ON(proc->p_arglen == 0);
1591 if (proc->p_decode != NULL)
1592 BUG_ON(proc->p_replen == 0);
1593 }
1594
1595
1596
1597
1598
1599
1600 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1601 req->rq_callsize <<= 2;
1602 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1603 req->rq_rcvsize <<= 2;
1604
1605 req->rq_buffer = xprt->ops->buf_alloc(task,
1606 req->rq_callsize + req->rq_rcvsize);
1607 if (req->rq_buffer != NULL)
1608 return;
1609 xprt_inject_disconnect(xprt);
1610
1611 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1612
1613 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1614 task->tk_action = call_allocate;
1615 rpc_delay(task, HZ>>4);
1616 return;
1617 }
1618
1619 rpc_exit(task, -ERESTARTSYS);
1620}
1621
1622static inline int
1623rpc_task_need_encode(struct rpc_task *task)
1624{
1625 return task->tk_rqstp->rq_snd_buf.len == 0;
1626}
1627
1628static inline void
1629rpc_task_force_reencode(struct rpc_task *task)
1630{
1631 task->tk_rqstp->rq_snd_buf.len = 0;
1632 task->tk_rqstp->rq_bytes_sent = 0;
1633}
1634
1635static inline void
1636rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1637{
1638 buf->head[0].iov_base = start;
1639 buf->head[0].iov_len = len;
1640 buf->tail[0].iov_len = 0;
1641 buf->page_len = 0;
1642 buf->flags = 0;
1643 buf->len = 0;
1644 buf->buflen = len;
1645}
1646
1647
1648
1649
1650static void
1651rpc_xdr_encode(struct rpc_task *task)
1652{
1653 struct rpc_rqst *req = task->tk_rqstp;
1654 kxdreproc_t encode;
1655 __be32 *p;
1656
1657 dprint_status(task);
1658
1659 rpc_xdr_buf_init(&req->rq_snd_buf,
1660 req->rq_buffer,
1661 req->rq_callsize);
1662 rpc_xdr_buf_init(&req->rq_rcv_buf,
1663 (char *)req->rq_buffer + req->rq_callsize,
1664 req->rq_rcvsize);
1665
1666 p = rpc_encode_header(task);
1667 if (p == NULL) {
1668 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1669 rpc_exit(task, -EIO);
1670 return;
1671 }
1672
1673 encode = task->tk_msg.rpc_proc->p_encode;
1674 if (encode == NULL)
1675 return;
1676
1677 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1678 task->tk_msg.rpc_argp);
1679}
1680
1681
1682
1683
1684static void
1685call_bind(struct rpc_task *task)
1686{
1687 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1688
1689 dprint_status(task);
1690
1691 task->tk_action = call_connect;
1692 if (!xprt_bound(xprt)) {
1693 task->tk_action = call_bind_status;
1694 task->tk_timeout = xprt->bind_timeout;
1695 xprt->ops->rpcbind(task);
1696 }
1697}
1698
1699
1700
1701
1702static void
1703call_bind_status(struct rpc_task *task)
1704{
1705 int status = -EIO;
1706
1707 if (task->tk_status >= 0) {
1708 dprint_status(task);
1709 task->tk_status = 0;
1710 task->tk_action = call_connect;
1711 return;
1712 }
1713
1714 trace_rpc_bind_status(task);
1715 switch (task->tk_status) {
1716 case -ENOMEM:
1717 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1718 rpc_delay(task, HZ >> 2);
1719 goto retry_timeout;
1720 case -EACCES:
1721 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1722 "unavailable\n", task->tk_pid);
1723
1724 if (task->tk_msg.rpc_proc->p_proc == 0) {
1725 status = -EOPNOTSUPP;
1726 break;
1727 }
1728 if (task->tk_rebind_retry == 0)
1729 break;
1730 task->tk_rebind_retry--;
1731 rpc_delay(task, 3*HZ);
1732 goto retry_timeout;
1733 case -ETIMEDOUT:
1734 dprintk("RPC: %5u rpcbind request timed out\n",
1735 task->tk_pid);
1736 goto retry_timeout;
1737 case -EPFNOSUPPORT:
1738
1739 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1740 task->tk_pid);
1741 break;
1742 case -EPROTONOSUPPORT:
1743 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1744 task->tk_pid);
1745 goto retry_timeout;
1746 case -ECONNREFUSED:
1747 case -ECONNRESET:
1748 case -ECONNABORTED:
1749 case -ENOTCONN:
1750 case -EHOSTDOWN:
1751 case -EHOSTUNREACH:
1752 case -ENETUNREACH:
1753 case -ENOBUFS:
1754 case -EPIPE:
1755 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1756 task->tk_pid, task->tk_status);
1757 if (!RPC_IS_SOFTCONN(task)) {
1758 rpc_delay(task, 5*HZ);
1759 goto retry_timeout;
1760 }
1761 status = task->tk_status;
1762 break;
1763 default:
1764 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1765 task->tk_pid, -task->tk_status);
1766 }
1767
1768 rpc_exit(task, status);
1769 return;
1770
1771retry_timeout:
1772 task->tk_status = 0;
1773 task->tk_action = call_timeout;
1774}
1775
1776
1777
1778
1779static void
1780call_connect(struct rpc_task *task)
1781{
1782 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1783
1784 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1785 task->tk_pid, xprt,
1786 (xprt_connected(xprt) ? "is" : "is not"));
1787
1788 task->tk_action = call_transmit;
1789 if (!xprt_connected(xprt)) {
1790 task->tk_action = call_connect_status;
1791 if (task->tk_status < 0)
1792 return;
1793 if (task->tk_flags & RPC_TASK_NOCONNECT) {
1794 rpc_exit(task, -ENOTCONN);
1795 return;
1796 }
1797 xprt_connect(task);
1798 }
1799}
1800
1801
1802
1803
1804static void
1805call_connect_status(struct rpc_task *task)
1806{
1807 struct rpc_clnt *clnt = task->tk_client;
1808 int status = task->tk_status;
1809
1810 dprint_status(task);
1811
1812 trace_rpc_connect_status(task, status);
1813 task->tk_status = 0;
1814 switch (status) {
1815 case -ECONNREFUSED:
1816 case -ECONNRESET:
1817 case -ECONNABORTED:
1818 case -ENETUNREACH:
1819 case -EHOSTUNREACH:
1820 case -EADDRINUSE:
1821 case -ENOBUFS:
1822 case -EPIPE:
1823 if (RPC_IS_SOFTCONN(task))
1824 break;
1825
1826 rpc_delay(task, 3*HZ);
1827 case -EAGAIN:
1828
1829 case -ETIMEDOUT:
1830 task->tk_action = call_timeout;
1831 return;
1832 case 0:
1833 clnt->cl_stats->netreconn++;
1834 task->tk_action = call_transmit;
1835 return;
1836 }
1837 rpc_exit(task, status);
1838}
1839
1840
1841
1842
1843static void
1844call_transmit(struct rpc_task *task)
1845{
1846 int is_retrans = RPC_WAS_SENT(task);
1847
1848 dprint_status(task);
1849
1850 task->tk_action = call_status;
1851 if (task->tk_status < 0)
1852 return;
1853 if (!xprt_prepare_transmit(task))
1854 return;
1855 task->tk_action = call_transmit_status;
1856
1857 if (rpc_task_need_encode(task)) {
1858 rpc_xdr_encode(task);
1859
1860 if (task->tk_status != 0) {
1861
1862 if (task->tk_status == -EAGAIN)
1863 rpc_delay(task, HZ >> 4);
1864 else
1865 rpc_exit(task, task->tk_status);
1866 return;
1867 }
1868 }
1869 xprt_transmit(task);
1870 if (task->tk_status < 0)
1871 return;
1872 if (is_retrans)
1873 task->tk_client->cl_stats->rpcretrans++;
1874
1875
1876
1877
1878 call_transmit_status(task);
1879 if (rpc_reply_expected(task))
1880 return;
1881 task->tk_action = rpc_exit_task;
1882 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1883}
1884
1885
1886
1887
1888static void
1889call_transmit_status(struct rpc_task *task)
1890{
1891 task->tk_action = call_status;
1892
1893
1894
1895
1896
1897 if (task->tk_status == 0) {
1898 xprt_end_transmit(task);
1899 rpc_task_force_reencode(task);
1900 return;
1901 }
1902
1903 switch (task->tk_status) {
1904 case -EAGAIN:
1905 case -ENOBUFS:
1906 break;
1907 default:
1908 dprint_status(task);
1909 xprt_end_transmit(task);
1910 rpc_task_force_reencode(task);
1911 break;
1912
1913
1914
1915
1916
1917
1918 case -ECONNREFUSED:
1919 case -EHOSTDOWN:
1920 case -EHOSTUNREACH:
1921 case -ENETUNREACH:
1922 case -EPERM:
1923 if (RPC_IS_SOFTCONN(task)) {
1924 xprt_end_transmit(task);
1925 rpc_exit(task, task->tk_status);
1926 break;
1927 }
1928 case -ECONNRESET:
1929 case -ECONNABORTED:
1930 case -EADDRINUSE:
1931 case -ENOTCONN:
1932 case -EPIPE:
1933 rpc_task_force_reencode(task);
1934 }
1935}
1936
1937#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1938
1939
1940
1941
1942static void
1943call_bc_transmit(struct rpc_task *task)
1944{
1945 struct rpc_rqst *req = task->tk_rqstp;
1946
1947 if (!xprt_prepare_transmit(task))
1948 goto out_retry;
1949
1950 if (task->tk_status < 0) {
1951 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1952 "error: %d\n", task->tk_status);
1953 goto out_done;
1954 }
1955 if (req->rq_connect_cookie != req->rq_xprt->connect_cookie)
1956 req->rq_bytes_sent = 0;
1957
1958 xprt_transmit(task);
1959
1960 if (task->tk_status == -EAGAIN)
1961 goto out_nospace;
1962
1963 xprt_end_transmit(task);
1964 dprint_status(task);
1965 switch (task->tk_status) {
1966 case 0:
1967
1968 case -EHOSTDOWN:
1969 case -EHOSTUNREACH:
1970 case -ENETUNREACH:
1971 case -ECONNRESET:
1972 case -ECONNREFUSED:
1973 case -EADDRINUSE:
1974 case -ENOTCONN:
1975 case -EPIPE:
1976 break;
1977 case -ETIMEDOUT:
1978
1979
1980
1981
1982
1983
1984
1985 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1986 "error: %d\n", task->tk_status);
1987 xprt_conditional_disconnect(req->rq_xprt,
1988 req->rq_connect_cookie);
1989 break;
1990 default:
1991
1992
1993
1994
1995 WARN_ON_ONCE(task->tk_status == -EAGAIN);
1996 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1997 "error: %d\n", task->tk_status);
1998 break;
1999 }
2000 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
2001out_done:
2002 task->tk_action = rpc_exit_task;
2003 return;
2004out_nospace:
2005 req->rq_connect_cookie = req->rq_xprt->connect_cookie;
2006out_retry:
2007 task->tk_status = 0;
2008}
2009#endif
2010
2011
2012
2013
2014static void
2015call_status(struct rpc_task *task)
2016{
2017 struct rpc_clnt *clnt = task->tk_client;
2018 struct rpc_rqst *req = task->tk_rqstp;
2019 int status;
2020
2021 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
2022 task->tk_status = req->rq_reply_bytes_recvd;
2023
2024 dprint_status(task);
2025
2026 status = task->tk_status;
2027 if (status >= 0) {
2028 task->tk_action = call_decode;
2029 return;
2030 }
2031
2032 trace_rpc_call_status(task);
2033 task->tk_status = 0;
2034 switch(status) {
2035 case -EHOSTDOWN:
2036 case -EHOSTUNREACH:
2037 case -ENETUNREACH:
2038 case -EPERM:
2039 if (RPC_IS_SOFTCONN(task)) {
2040 rpc_exit(task, status);
2041 break;
2042 }
2043
2044
2045
2046
2047 rpc_delay(task, 3*HZ);
2048 case -ETIMEDOUT:
2049 task->tk_action = call_timeout;
2050 if (!(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT)
2051 && task->tk_client->cl_discrtry)
2052 xprt_conditional_disconnect(req->rq_xprt,
2053 req->rq_connect_cookie);
2054 break;
2055 case -ECONNREFUSED:
2056 case -ECONNRESET:
2057 case -ECONNABORTED:
2058 rpc_force_rebind(clnt);
2059 case -EADDRINUSE:
2060 rpc_delay(task, 3*HZ);
2061 case -EPIPE:
2062 case -ENOTCONN:
2063 task->tk_action = call_bind;
2064 break;
2065 case -ENOBUFS:
2066 rpc_delay(task, HZ>>2);
2067 case -EAGAIN:
2068 task->tk_action = call_transmit;
2069 break;
2070 case -EIO:
2071
2072 rpc_exit(task, status);
2073 break;
2074 default:
2075 if (clnt->cl_chatty)
2076 printk("%s: RPC call returned error %d\n",
2077 clnt->cl_program->name, -status);
2078 rpc_exit(task, status);
2079 }
2080}
2081
2082
2083
2084
2085
2086
2087static void
2088call_timeout(struct rpc_task *task)
2089{
2090 struct rpc_clnt *clnt = task->tk_client;
2091
2092 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
2093 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
2094 goto retry;
2095 }
2096
2097 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
2098 task->tk_timeouts++;
2099
2100 if (RPC_IS_SOFTCONN(task)) {
2101 rpc_exit(task, -ETIMEDOUT);
2102 return;
2103 }
2104 if (RPC_IS_SOFT(task)) {
2105 if (clnt->cl_chatty) {
2106 rcu_read_lock();
2107 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
2108 clnt->cl_program->name,
2109 rcu_dereference(clnt->cl_xprt)->servername);
2110 rcu_read_unlock();
2111 }
2112 if (task->tk_flags & RPC_TASK_TIMEOUT)
2113 rpc_exit(task, -ETIMEDOUT);
2114 else
2115 rpc_exit(task, -EIO);
2116 return;
2117 }
2118
2119 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
2120 task->tk_flags |= RPC_CALL_MAJORSEEN;
2121 if (clnt->cl_chatty) {
2122 rcu_read_lock();
2123 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
2124 clnt->cl_program->name,
2125 rcu_dereference(clnt->cl_xprt)->servername);
2126 rcu_read_unlock();
2127 }
2128 }
2129 rpc_force_rebind(clnt);
2130
2131
2132
2133
2134 rpcauth_invalcred(task);
2135
2136retry:
2137 task->tk_action = call_bind;
2138 task->tk_status = 0;
2139}
2140
2141
2142
2143
2144static void
2145call_decode(struct rpc_task *task)
2146{
2147 struct rpc_clnt *clnt = task->tk_client;
2148 struct rpc_rqst *req = task->tk_rqstp;
2149 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
2150 __be32 *p;
2151
2152 dprint_status(task);
2153
2154 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
2155 if (clnt->cl_chatty) {
2156 rcu_read_lock();
2157 printk(KERN_NOTICE "%s: server %s OK\n",
2158 clnt->cl_program->name,
2159 rcu_dereference(clnt->cl_xprt)->servername);
2160 rcu_read_unlock();
2161 }
2162 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
2163 }
2164
2165
2166
2167
2168
2169 smp_rmb();
2170 req->rq_rcv_buf.len = req->rq_private_buf.len;
2171
2172
2173 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2174 sizeof(req->rq_rcv_buf)) != 0);
2175
2176 if (req->rq_rcv_buf.len < 12) {
2177 if (!RPC_IS_SOFT(task)) {
2178 task->tk_action = call_bind;
2179 goto out_retry;
2180 }
2181 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
2182 clnt->cl_program->name, task->tk_status);
2183 task->tk_action = call_timeout;
2184 goto out_retry;
2185 }
2186
2187 p = rpc_verify_header(task);
2188 if (IS_ERR(p)) {
2189 if (p == ERR_PTR(-EAGAIN))
2190 goto out_retry;
2191 return;
2192 }
2193
2194 task->tk_action = rpc_exit_task;
2195
2196 if (decode) {
2197 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
2198 task->tk_msg.rpc_resp);
2199 }
2200 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
2201 task->tk_status);
2202 return;
2203out_retry:
2204 task->tk_status = 0;
2205
2206 if (task->tk_rqstp == req) {
2207 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
2208 if (task->tk_client->cl_discrtry)
2209 xprt_conditional_disconnect(req->rq_xprt,
2210 req->rq_connect_cookie);
2211 }
2212}
2213
2214static __be32 *
2215rpc_encode_header(struct rpc_task *task)
2216{
2217 struct rpc_clnt *clnt = task->tk_client;
2218 struct rpc_rqst *req = task->tk_rqstp;
2219 __be32 *p = req->rq_svec[0].iov_base;
2220
2221
2222
2223 p = xprt_skip_transport_header(req->rq_xprt, p);
2224 *p++ = req->rq_xid;
2225 *p++ = htonl(RPC_CALL);
2226 *p++ = htonl(RPC_VERSION);
2227 *p++ = htonl(clnt->cl_prog);
2228 *p++ = htonl(clnt->cl_vers);
2229 *p++ = htonl(task->tk_msg.rpc_proc->p_proc);
2230 p = rpcauth_marshcred(task, p);
2231 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2232 return p;
2233}
2234
2235static __be32 *
2236rpc_verify_header(struct rpc_task *task)
2237{
2238 struct rpc_clnt *clnt = task->tk_client;
2239 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2240 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2241 __be32 *p = iov->iov_base;
2242 u32 n;
2243 int error = -EACCES;
2244
2245 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2246
2247
2248
2249
2250
2251 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2252 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2253 task->tk_rqstp->rq_rcv_buf.len);
2254 error = -EIO;
2255 goto out_err;
2256 }
2257 if ((len -= 3) < 0)
2258 goto out_overflow;
2259
2260 p += 1;
2261 if ((n = ntohl(*p++)) != RPC_REPLY) {
2262 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2263 task->tk_pid, __func__, n);
2264 error = -EIO;
2265 goto out_garbage;
2266 }
2267
2268 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2269 if (--len < 0)
2270 goto out_overflow;
2271 switch ((n = ntohl(*p++))) {
2272 case RPC_AUTH_ERROR:
2273 break;
2274 case RPC_MISMATCH:
2275 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2276 task->tk_pid, __func__);
2277 error = -EPROTONOSUPPORT;
2278 goto out_err;
2279 default:
2280 dprintk("RPC: %5u %s: RPC call rejected, "
2281 "unknown error: %x\n",
2282 task->tk_pid, __func__, n);
2283 error = -EIO;
2284 goto out_err;
2285 }
2286 if (--len < 0)
2287 goto out_overflow;
2288 switch ((n = ntohl(*p++))) {
2289 case RPC_AUTH_REJECTEDCRED:
2290 case RPC_AUTH_REJECTEDVERF:
2291 case RPCSEC_GSS_CREDPROBLEM:
2292 case RPCSEC_GSS_CTXPROBLEM:
2293 if (!task->tk_cred_retry)
2294 break;
2295 task->tk_cred_retry--;
2296 dprintk("RPC: %5u %s: retry stale creds\n",
2297 task->tk_pid, __func__);
2298 rpcauth_invalcred(task);
2299
2300 xprt_release(task);
2301 task->tk_action = call_reserve;
2302 goto out_retry;
2303 case RPC_AUTH_BADCRED:
2304 case RPC_AUTH_BADVERF:
2305
2306 if (!task->tk_garb_retry)
2307 break;
2308 task->tk_garb_retry--;
2309 dprintk("RPC: %5u %s: retry garbled creds\n",
2310 task->tk_pid, __func__);
2311 task->tk_action = call_bind;
2312 goto out_retry;
2313 case RPC_AUTH_TOOWEAK:
2314 rcu_read_lock();
2315 printk(KERN_NOTICE "RPC: server %s requires stronger "
2316 "authentication.\n",
2317 rcu_dereference(clnt->cl_xprt)->servername);
2318 rcu_read_unlock();
2319 break;
2320 default:
2321 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2322 task->tk_pid, __func__, n);
2323 error = -EIO;
2324 }
2325 dprintk("RPC: %5u %s: call rejected %d\n",
2326 task->tk_pid, __func__, n);
2327 goto out_err;
2328 }
2329 p = rpcauth_checkverf(task, p);
2330 if (IS_ERR(p)) {
2331 error = PTR_ERR(p);
2332 dprintk("RPC: %5u %s: auth check failed with %d\n",
2333 task->tk_pid, __func__, error);
2334 goto out_garbage;
2335 }
2336 len = p - (__be32 *)iov->iov_base - 1;
2337 if (len < 0)
2338 goto out_overflow;
2339 switch ((n = ntohl(*p++))) {
2340 case RPC_SUCCESS:
2341 return p;
2342 case RPC_PROG_UNAVAIL:
2343 dprintk_rcu("RPC: %5u %s: program %u is unsupported "
2344 "by server %s\n", task->tk_pid, __func__,
2345 (unsigned int)clnt->cl_prog,
2346 rcu_dereference(clnt->cl_xprt)->servername);
2347 error = -EPFNOSUPPORT;
2348 goto out_err;
2349 case RPC_PROG_MISMATCH:
2350 dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
2351 "by server %s\n", task->tk_pid, __func__,
2352 (unsigned int)clnt->cl_prog,
2353 (unsigned int)clnt->cl_vers,
2354 rcu_dereference(clnt->cl_xprt)->servername);
2355 error = -EPROTONOSUPPORT;
2356 goto out_err;
2357 case RPC_PROC_UNAVAIL:
2358 dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
2359 "version %u on server %s\n",
2360 task->tk_pid, __func__,
2361 rpc_proc_name(task),
2362 clnt->cl_prog, clnt->cl_vers,
2363 rcu_dereference(clnt->cl_xprt)->servername);
2364 error = -EOPNOTSUPP;
2365 goto out_err;
2366 case RPC_GARBAGE_ARGS:
2367 dprintk("RPC: %5u %s: server saw garbage\n",
2368 task->tk_pid, __func__);
2369 break;
2370 default:
2371 dprintk("RPC: %5u %s: server accept status: %x\n",
2372 task->tk_pid, __func__, n);
2373
2374 }
2375
2376out_garbage:
2377 clnt->cl_stats->rpcgarbage++;
2378 if (task->tk_garb_retry) {
2379 task->tk_garb_retry--;
2380 dprintk("RPC: %5u %s: retrying\n",
2381 task->tk_pid, __func__);
2382 task->tk_action = call_bind;
2383out_retry:
2384 return ERR_PTR(-EAGAIN);
2385 }
2386out_err:
2387 rpc_exit(task, error);
2388 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2389 __func__, error);
2390 return ERR_PTR(error);
2391out_overflow:
2392 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2393 __func__);
2394 goto out_garbage;
2395}
2396
2397static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2398{
2399}
2400
2401static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2402{
2403 return 0;
2404}
2405
2406static struct rpc_procinfo rpcproc_null = {
2407 .p_encode = rpcproc_encode_null,
2408 .p_decode = rpcproc_decode_null,
2409};
2410
2411static int rpc_ping(struct rpc_clnt *clnt)
2412{
2413 struct rpc_message msg = {
2414 .rpc_proc = &rpcproc_null,
2415 };
2416 int err;
2417 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2418 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2419 put_rpccred(msg.rpc_cred);
2420 return err;
2421}
2422
2423struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2424{
2425 struct rpc_message msg = {
2426 .rpc_proc = &rpcproc_null,
2427 .rpc_cred = cred,
2428 };
2429 struct rpc_task_setup task_setup_data = {
2430 .rpc_client = clnt,
2431 .rpc_message = &msg,
2432 .callback_ops = &rpc_default_ops,
2433 .flags = flags,
2434 };
2435 return rpc_run_task(&task_setup_data);
2436}
2437EXPORT_SYMBOL_GPL(rpc_call_null);
2438
2439#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2440static void rpc_show_header(void)
2441{
2442 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2443 "-timeout ---ops--\n");
2444}
2445
2446static void rpc_show_task(const struct rpc_clnt *clnt,
2447 const struct rpc_task *task)
2448{
2449 const char *rpc_waitq = "none";
2450
2451 if (RPC_IS_QUEUED(task))
2452 rpc_waitq = rpc_qname(task->tk_waitqueue);
2453
2454 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2455 task->tk_pid, task->tk_flags, task->tk_status,
2456 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2457 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
2458 task->tk_action, rpc_waitq);
2459}
2460
2461void rpc_show_tasks(struct net *net)
2462{
2463 struct rpc_clnt *clnt;
2464 struct rpc_task *task;
2465 int header = 0;
2466 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2467
2468 spin_lock(&sn->rpc_client_lock);
2469 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2470 spin_lock(&clnt->cl_lock);
2471 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2472 if (!header) {
2473 rpc_show_header();
2474 header++;
2475 }
2476 rpc_show_task(clnt, task);
2477 }
2478 spin_unlock(&clnt->cl_lock);
2479 }
2480 spin_unlock(&sn->rpc_client_lock);
2481}
2482#endif
2483
2484#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2485int
2486rpc_clnt_swap_activate(struct rpc_clnt *clnt)
2487{
2488 int ret = 0;
2489 struct rpc_xprt *xprt;
2490
2491 if (atomic_inc_return(&clnt->cl_swapper) == 1) {
2492retry:
2493 rcu_read_lock();
2494 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
2495 rcu_read_unlock();
2496 if (!xprt) {
2497
2498
2499
2500
2501
2502 synchronize_rcu();
2503 goto retry;
2504 }
2505
2506 ret = xprt_enable_swap(xprt);
2507 xprt_put(xprt);
2508 }
2509 return ret;
2510}
2511EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
2512
2513void
2514rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
2515{
2516 struct rpc_xprt *xprt;
2517
2518 if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) {
2519retry:
2520 rcu_read_lock();
2521 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
2522 rcu_read_unlock();
2523 if (!xprt) {
2524
2525
2526
2527
2528
2529 synchronize_rcu();
2530 goto retry;
2531 }
2532
2533 xprt_disable_swap(xprt);
2534 xprt_put(xprt);
2535 }
2536}
2537EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
2538#endif
2539