This source file includes following definitions.
- rpc_register_client
- rpc_unregister_client
- __rpc_clnt_remove_pipedir
- rpc_clnt_remove_pipedir
- rpc_setup_pipedir_sb
- rpc_setup_pipedir
- rpc_clnt_skip_event
- __rpc_clnt_handle_event
- __rpc_pipefs_event
- rpc_get_client_for_event
- rpc_pipefs_event
- rpc_clients_notifier_register
- rpc_clients_notifier_unregister
- rpc_clnt_set_transport
- rpc_clnt_set_nodename
- rpc_client_register
- rpc_cleanup_clids
- rpc_alloc_clid
- rpc_free_clid
- rpc_new_client
- rpc_create_xprt
- rpc_create
- __rpc_clone_client
- rpc_clone_client
- rpc_clone_client_set_auth
- rpc_switch_client_transport
- rpc_clnt_xprt_iter_init
- rpc_clnt_iterate_for_each_xprt
- rpc_killall_tasks
- rpc_shutdown_client
- rpc_free_client
- rpc_free_auth
- rpc_release_client
- rpc_bind_new_program
- rpc_task_get_xprt
- rpc_task_release_xprt
- rpc_task_release_transport
- rpc_task_release_client
- rpc_task_get_first_xprt
- rpc_task_get_next_xprt
- rpc_task_set_transport
- rpc_task_set_client
- rpc_task_set_rpc_message
- rpc_default_callback
- rpc_run_task
- rpc_call_sync
- rpc_call_async
- rpc_run_bc_task
- rpc_prepare_reply_pages
- rpc_call_start
- rpc_peeraddr
- rpc_peeraddr2str
- rpc_sockname
- rpc_anyaddr
- rpc_localaddr
- rpc_setbufsize
- rpc_net_ns
- rpc_max_payload
- rpc_max_bc_payload
- rpc_num_bc_slots
- rpc_force_rebind
- __rpc_restart_call
- rpc_restart_call
- rpc_restart_call_prepare
- rpc_proc_name
- __rpc_call_rpcerror
- rpc_call_rpcerror
- call_start
- call_reserve
- call_reserveresult
- call_retry_reserve
- call_refresh
- call_refreshresult
- call_allocate
- rpc_task_need_encode
- rpc_xdr_encode
- call_encode
- rpc_task_transmitted
- rpc_task_handle_transmitted
- call_bind
- call_bind_status
- call_connect
- call_connect_status
- call_transmit
- call_transmit_status
- call_bc_encode
- call_bc_transmit
- call_bc_transmit_status
- call_status
- rpc_check_connected
- rpc_check_timeout
- call_decode
- rpc_encode_header
- rpc_decode_header
- rpcproc_encode_null
- rpcproc_decode_null
- rpc_ping
- rpc_call_null_helper
- rpc_call_null
- rpc_cb_add_xprt_done
- rpc_cb_add_xprt_release
- rpc_clnt_test_and_add_xprt
- rpc_clnt_setup_test_and_add_xprt
- rpc_clnt_add_xprt
- rpc_xprt_set_connect_timeout
- rpc_set_connect_timeout
- rpc_clnt_xprt_switch_put
- rpc_clnt_xprt_switch_add_xprt
- rpc_clnt_xprt_switch_has_addr
- rpc_show_header
- rpc_show_task
- rpc_show_tasks
- rpc_clnt_swap_activate_callback
- rpc_clnt_swap_activate
- rpc_clnt_swap_deactivate_callback
- rpc_clnt_swap_deactivate
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22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/kallsyms.h>
25 #include <linux/mm.h>
26 #include <linux/namei.h>
27 #include <linux/mount.h>
28 #include <linux/slab.h>
29 #include <linux/rcupdate.h>
30 #include <linux/utsname.h>
31 #include <linux/workqueue.h>
32 #include <linux/in.h>
33 #include <linux/in6.h>
34 #include <linux/un.h>
35
36 #include <linux/sunrpc/clnt.h>
37 #include <linux/sunrpc/addr.h>
38 #include <linux/sunrpc/rpc_pipe_fs.h>
39 #include <linux/sunrpc/metrics.h>
40 #include <linux/sunrpc/bc_xprt.h>
41 #include <trace/events/sunrpc.h>
42
43 #include "sunrpc.h"
44 #include "netns.h"
45
46 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
47 # define RPCDBG_FACILITY RPCDBG_CALL
48 #endif
49
50 #define dprint_status(t) \
51 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
52 __func__, t->tk_status)
53
54
55
56
57
58 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
59
60
61 static void call_start(struct rpc_task *task);
62 static void call_reserve(struct rpc_task *task);
63 static void call_reserveresult(struct rpc_task *task);
64 static void call_allocate(struct rpc_task *task);
65 static void call_encode(struct rpc_task *task);
66 static void call_decode(struct rpc_task *task);
67 static void call_bind(struct rpc_task *task);
68 static void call_bind_status(struct rpc_task *task);
69 static void call_transmit(struct rpc_task *task);
70 static void call_status(struct rpc_task *task);
71 static void call_transmit_status(struct rpc_task *task);
72 static void call_refresh(struct rpc_task *task);
73 static void call_refreshresult(struct rpc_task *task);
74 static void call_connect(struct rpc_task *task);
75 static void call_connect_status(struct rpc_task *task);
76
77 static int rpc_encode_header(struct rpc_task *task,
78 struct xdr_stream *xdr);
79 static int rpc_decode_header(struct rpc_task *task,
80 struct xdr_stream *xdr);
81 static int rpc_ping(struct rpc_clnt *clnt);
82 static void rpc_check_timeout(struct rpc_task *task);
83
84 static void rpc_register_client(struct rpc_clnt *clnt)
85 {
86 struct net *net = rpc_net_ns(clnt);
87 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
88
89 spin_lock(&sn->rpc_client_lock);
90 list_add(&clnt->cl_clients, &sn->all_clients);
91 spin_unlock(&sn->rpc_client_lock);
92 }
93
94 static void rpc_unregister_client(struct rpc_clnt *clnt)
95 {
96 struct net *net = rpc_net_ns(clnt);
97 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
98
99 spin_lock(&sn->rpc_client_lock);
100 list_del(&clnt->cl_clients);
101 spin_unlock(&sn->rpc_client_lock);
102 }
103
104 static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
105 {
106 rpc_remove_client_dir(clnt);
107 }
108
109 static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
110 {
111 struct net *net = rpc_net_ns(clnt);
112 struct super_block *pipefs_sb;
113
114 pipefs_sb = rpc_get_sb_net(net);
115 if (pipefs_sb) {
116 __rpc_clnt_remove_pipedir(clnt);
117 rpc_put_sb_net(net);
118 }
119 }
120
121 static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
122 struct rpc_clnt *clnt)
123 {
124 static uint32_t clntid;
125 const char *dir_name = clnt->cl_program->pipe_dir_name;
126 char name[15];
127 struct dentry *dir, *dentry;
128
129 dir = rpc_d_lookup_sb(sb, dir_name);
130 if (dir == NULL) {
131 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
132 return dir;
133 }
134 for (;;) {
135 snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
136 name[sizeof(name) - 1] = '\0';
137 dentry = rpc_create_client_dir(dir, name, clnt);
138 if (!IS_ERR(dentry))
139 break;
140 if (dentry == ERR_PTR(-EEXIST))
141 continue;
142 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
143 " %s/%s, error %ld\n",
144 dir_name, name, PTR_ERR(dentry));
145 break;
146 }
147 dput(dir);
148 return dentry;
149 }
150
151 static int
152 rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt)
153 {
154 struct dentry *dentry;
155
156 if (clnt->cl_program->pipe_dir_name != NULL) {
157 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt);
158 if (IS_ERR(dentry))
159 return PTR_ERR(dentry);
160 }
161 return 0;
162 }
163
164 static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
165 {
166 if (clnt->cl_program->pipe_dir_name == NULL)
167 return 1;
168
169 switch (event) {
170 case RPC_PIPEFS_MOUNT:
171 if (clnt->cl_pipedir_objects.pdh_dentry != NULL)
172 return 1;
173 if (atomic_read(&clnt->cl_count) == 0)
174 return 1;
175 break;
176 case RPC_PIPEFS_UMOUNT:
177 if (clnt->cl_pipedir_objects.pdh_dentry == NULL)
178 return 1;
179 break;
180 }
181 return 0;
182 }
183
184 static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
185 struct super_block *sb)
186 {
187 struct dentry *dentry;
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 0;
205 }
206
207 static 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
221 static 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
237 static 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
252 static struct notifier_block rpc_clients_block = {
253 .notifier_call = rpc_pipefs_event,
254 .priority = SUNRPC_PIPEFS_RPC_PRIO,
255 };
256
257 int rpc_clients_notifier_register(void)
258 {
259 return rpc_pipefs_notifier_register(&rpc_clients_block);
260 }
261
262 void rpc_clients_notifier_unregister(void)
263 {
264 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
265 }
266
267 static 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
287 static 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
293 static 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;
327 err_auth:
328 pipefs_sb = rpc_get_sb_net(net);
329 rpc_unregister_client(clnt);
330 __rpc_clnt_remove_pipedir(clnt);
331 out:
332 if (pipefs_sb)
333 rpc_put_sb_net(net);
334 rpc_clnt_debugfs_unregister(clnt);
335 return err;
336 }
337
338 static DEFINE_IDA(rpc_clids);
339
340 void rpc_cleanup_clids(void)
341 {
342 ida_destroy(&rpc_clids);
343 }
344
345 static int rpc_alloc_clid(struct rpc_clnt *clnt)
346 {
347 int clid;
348
349 clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
350 if (clid < 0)
351 return clid;
352 clnt->cl_clid = clid;
353 return 0;
354 }
355
356 static void rpc_free_clid(struct rpc_clnt *clnt)
357 {
358 ida_simple_remove(&rpc_clids, clnt->cl_clid);
359 }
360
361 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
362 struct rpc_xprt_switch *xps,
363 struct rpc_xprt *xprt,
364 struct rpc_clnt *parent)
365 {
366 const struct rpc_program *program = args->program;
367 const struct rpc_version *version;
368 struct rpc_clnt *clnt = NULL;
369 const struct rpc_timeout *timeout;
370 const char *nodename = args->nodename;
371 int err;
372
373
374 dprintk("RPC: creating %s client for %s (xprt %p)\n",
375 program->name, args->servername, xprt);
376
377 err = rpciod_up();
378 if (err)
379 goto out_no_rpciod;
380
381 err = -EINVAL;
382 if (args->version >= program->nrvers)
383 goto out_err;
384 version = program->version[args->version];
385 if (version == NULL)
386 goto out_err;
387
388 err = -ENOMEM;
389 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
390 if (!clnt)
391 goto out_err;
392 clnt->cl_parent = parent ? : clnt;
393
394 err = rpc_alloc_clid(clnt);
395 if (err)
396 goto out_no_clid;
397
398 clnt->cl_cred = get_cred(args->cred);
399 clnt->cl_procinfo = version->procs;
400 clnt->cl_maxproc = version->nrprocs;
401 clnt->cl_prog = args->prognumber ? : program->number;
402 clnt->cl_vers = version->number;
403 clnt->cl_stats = program->stats;
404 clnt->cl_metrics = rpc_alloc_iostats(clnt);
405 rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
406 err = -ENOMEM;
407 if (clnt->cl_metrics == NULL)
408 goto out_no_stats;
409 clnt->cl_program = program;
410 INIT_LIST_HEAD(&clnt->cl_tasks);
411 spin_lock_init(&clnt->cl_lock);
412
413 timeout = xprt->timeout;
414 if (args->timeout != NULL) {
415 memcpy(&clnt->cl_timeout_default, args->timeout,
416 sizeof(clnt->cl_timeout_default));
417 timeout = &clnt->cl_timeout_default;
418 }
419
420 rpc_clnt_set_transport(clnt, xprt, timeout);
421 xprt_iter_init(&clnt->cl_xpi, xps);
422 xprt_switch_put(xps);
423
424 clnt->cl_rtt = &clnt->cl_rtt_default;
425 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
426
427 atomic_set(&clnt->cl_count, 1);
428
429 if (nodename == NULL)
430 nodename = utsname()->nodename;
431
432 rpc_clnt_set_nodename(clnt, nodename);
433
434 err = rpc_client_register(clnt, args->authflavor, args->client_name);
435 if (err)
436 goto out_no_path;
437 if (parent)
438 atomic_inc(&parent->cl_count);
439 return clnt;
440
441 out_no_path:
442 rpc_free_iostats(clnt->cl_metrics);
443 out_no_stats:
444 put_cred(clnt->cl_cred);
445 rpc_free_clid(clnt);
446 out_no_clid:
447 kfree(clnt);
448 out_err:
449 rpciod_down();
450 out_no_rpciod:
451 xprt_switch_put(xps);
452 xprt_put(xprt);
453 return ERR_PTR(err);
454 }
455
456 static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
457 struct rpc_xprt *xprt)
458 {
459 struct rpc_clnt *clnt = NULL;
460 struct rpc_xprt_switch *xps;
461
462 if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) {
463 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
464 xps = args->bc_xprt->xpt_bc_xps;
465 xprt_switch_get(xps);
466 } else {
467 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
468 if (xps == NULL) {
469 xprt_put(xprt);
470 return ERR_PTR(-ENOMEM);
471 }
472 if (xprt->bc_xprt) {
473 xprt_switch_get(xps);
474 xprt->bc_xprt->xpt_bc_xps = xps;
475 }
476 }
477 clnt = rpc_new_client(args, xps, xprt, NULL);
478 if (IS_ERR(clnt))
479 return clnt;
480
481 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
482 int err = rpc_ping(clnt);
483 if (err != 0) {
484 rpc_shutdown_client(clnt);
485 return ERR_PTR(err);
486 }
487 }
488
489 clnt->cl_softrtry = 1;
490 if (args->flags & (RPC_CLNT_CREATE_HARDRTRY|RPC_CLNT_CREATE_SOFTERR)) {
491 clnt->cl_softrtry = 0;
492 if (args->flags & RPC_CLNT_CREATE_SOFTERR)
493 clnt->cl_softerr = 1;
494 }
495
496 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
497 clnt->cl_autobind = 1;
498 if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
499 clnt->cl_noretranstimeo = 1;
500 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
501 clnt->cl_discrtry = 1;
502 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
503 clnt->cl_chatty = 1;
504
505 return clnt;
506 }
507
508
509
510
511
512
513
514
515
516
517
518 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
519 {
520 struct rpc_xprt *xprt;
521 struct xprt_create xprtargs = {
522 .net = args->net,
523 .ident = args->protocol,
524 .srcaddr = args->saddress,
525 .dstaddr = args->address,
526 .addrlen = args->addrsize,
527 .servername = args->servername,
528 .bc_xprt = args->bc_xprt,
529 };
530 char servername[48];
531 struct rpc_clnt *clnt;
532 int i;
533
534 if (args->bc_xprt) {
535 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
536 xprt = args->bc_xprt->xpt_bc_xprt;
537 if (xprt) {
538 xprt_get(xprt);
539 return rpc_create_xprt(args, xprt);
540 }
541 }
542
543 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
544 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
545 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
546 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
547
548
549
550
551 if (xprtargs.servername == NULL) {
552 struct sockaddr_un *sun =
553 (struct sockaddr_un *)args->address;
554 struct sockaddr_in *sin =
555 (struct sockaddr_in *)args->address;
556 struct sockaddr_in6 *sin6 =
557 (struct sockaddr_in6 *)args->address;
558
559 servername[0] = '\0';
560 switch (args->address->sa_family) {
561 case AF_LOCAL:
562 snprintf(servername, sizeof(servername), "%s",
563 sun->sun_path);
564 break;
565 case AF_INET:
566 snprintf(servername, sizeof(servername), "%pI4",
567 &sin->sin_addr.s_addr);
568 break;
569 case AF_INET6:
570 snprintf(servername, sizeof(servername), "%pI6",
571 &sin6->sin6_addr);
572 break;
573 default:
574
575
576 return ERR_PTR(-EINVAL);
577 }
578 xprtargs.servername = servername;
579 }
580
581 xprt = xprt_create_transport(&xprtargs);
582 if (IS_ERR(xprt))
583 return (struct rpc_clnt *)xprt;
584
585
586
587
588
589
590
591 xprt->resvport = 1;
592 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
593 xprt->resvport = 0;
594
595 clnt = rpc_create_xprt(args, xprt);
596 if (IS_ERR(clnt) || args->nconnect <= 1)
597 return clnt;
598
599 for (i = 0; i < args->nconnect - 1; i++) {
600 if (rpc_clnt_add_xprt(clnt, &xprtargs, NULL, NULL) < 0)
601 break;
602 }
603 return clnt;
604 }
605 EXPORT_SYMBOL_GPL(rpc_create);
606
607
608
609
610
611
612 static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
613 struct rpc_clnt *clnt)
614 {
615 struct rpc_xprt_switch *xps;
616 struct rpc_xprt *xprt;
617 struct rpc_clnt *new;
618 int err;
619
620 err = -ENOMEM;
621 rcu_read_lock();
622 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
623 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
624 rcu_read_unlock();
625 if (xprt == NULL || xps == NULL) {
626 xprt_put(xprt);
627 xprt_switch_put(xps);
628 goto out_err;
629 }
630 args->servername = xprt->servername;
631 args->nodename = clnt->cl_nodename;
632
633 new = rpc_new_client(args, xps, xprt, clnt);
634 if (IS_ERR(new)) {
635 err = PTR_ERR(new);
636 goto out_err;
637 }
638
639
640 new->cl_autobind = 0;
641 new->cl_softrtry = clnt->cl_softrtry;
642 new->cl_softerr = clnt->cl_softerr;
643 new->cl_noretranstimeo = clnt->cl_noretranstimeo;
644 new->cl_discrtry = clnt->cl_discrtry;
645 new->cl_chatty = clnt->cl_chatty;
646 new->cl_principal = clnt->cl_principal;
647 return new;
648
649 out_err:
650 dprintk("RPC: %s: returned error %d\n", __func__, err);
651 return ERR_PTR(err);
652 }
653
654
655
656
657
658
659
660
661 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
662 {
663 struct rpc_create_args args = {
664 .program = clnt->cl_program,
665 .prognumber = clnt->cl_prog,
666 .version = clnt->cl_vers,
667 .authflavor = clnt->cl_auth->au_flavor,
668 .cred = clnt->cl_cred,
669 };
670 return __rpc_clone_client(&args, clnt);
671 }
672 EXPORT_SYMBOL_GPL(rpc_clone_client);
673
674
675
676
677
678
679
680
681
682 struct rpc_clnt *
683 rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
684 {
685 struct rpc_create_args args = {
686 .program = clnt->cl_program,
687 .prognumber = clnt->cl_prog,
688 .version = clnt->cl_vers,
689 .authflavor = flavor,
690 .cred = clnt->cl_cred,
691 };
692 return __rpc_clone_client(&args, clnt);
693 }
694 EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711 int rpc_switch_client_transport(struct rpc_clnt *clnt,
712 struct xprt_create *args,
713 const struct rpc_timeout *timeout)
714 {
715 const struct rpc_timeout *old_timeo;
716 rpc_authflavor_t pseudoflavor;
717 struct rpc_xprt_switch *xps, *oldxps;
718 struct rpc_xprt *xprt, *old;
719 struct rpc_clnt *parent;
720 int err;
721
722 xprt = xprt_create_transport(args);
723 if (IS_ERR(xprt)) {
724 dprintk("RPC: failed to create new xprt for clnt %p\n",
725 clnt);
726 return PTR_ERR(xprt);
727 }
728
729 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
730 if (xps == NULL) {
731 xprt_put(xprt);
732 return -ENOMEM;
733 }
734
735 pseudoflavor = clnt->cl_auth->au_flavor;
736
737 old_timeo = clnt->cl_timeout;
738 old = rpc_clnt_set_transport(clnt, xprt, timeout);
739 oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps);
740
741 rpc_unregister_client(clnt);
742 __rpc_clnt_remove_pipedir(clnt);
743 rpc_clnt_debugfs_unregister(clnt);
744
745
746
747
748
749
750 parent = clnt->cl_parent;
751 clnt->cl_parent = clnt;
752
753
754
755
756
757
758 err = rpc_client_register(clnt, pseudoflavor, NULL);
759 if (err)
760 goto out_revert;
761
762 synchronize_rcu();
763 if (parent != clnt)
764 rpc_release_client(parent);
765 xprt_switch_put(oldxps);
766 xprt_put(old);
767 dprintk("RPC: replaced xprt for clnt %p\n", clnt);
768 return 0;
769
770 out_revert:
771 xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps);
772 rpc_clnt_set_transport(clnt, old, old_timeo);
773 clnt->cl_parent = parent;
774 rpc_client_register(clnt, pseudoflavor, NULL);
775 xprt_switch_put(xps);
776 xprt_put(xprt);
777 dprintk("RPC: failed to switch xprt for clnt %p\n", clnt);
778 return err;
779 }
780 EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
781
782 static
783 int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi)
784 {
785 struct rpc_xprt_switch *xps;
786
787 rcu_read_lock();
788 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
789 rcu_read_unlock();
790 if (xps == NULL)
791 return -EAGAIN;
792 xprt_iter_init_listall(xpi, xps);
793 xprt_switch_put(xps);
794 return 0;
795 }
796
797
798
799
800
801
802
803
804
805
806
807
808 int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
809 int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
810 void *data)
811 {
812 struct rpc_xprt_iter xpi;
813 int ret;
814
815 ret = rpc_clnt_xprt_iter_init(clnt, &xpi);
816 if (ret)
817 return ret;
818 for (;;) {
819 struct rpc_xprt *xprt = xprt_iter_get_next(&xpi);
820
821 if (!xprt)
822 break;
823 ret = fn(clnt, xprt, data);
824 xprt_put(xprt);
825 if (ret < 0)
826 break;
827 }
828 xprt_iter_destroy(&xpi);
829 return ret;
830 }
831 EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt);
832
833
834
835
836
837 void rpc_killall_tasks(struct rpc_clnt *clnt)
838 {
839 struct rpc_task *rovr;
840
841
842 if (list_empty(&clnt->cl_tasks))
843 return;
844 dprintk("RPC: killing all tasks for client %p\n", clnt);
845
846
847
848 spin_lock(&clnt->cl_lock);
849 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task)
850 rpc_signal_task(rovr);
851 spin_unlock(&clnt->cl_lock);
852 }
853 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
854
855
856
857
858
859 void rpc_shutdown_client(struct rpc_clnt *clnt)
860 {
861 might_sleep();
862
863 dprintk_rcu("RPC: shutting down %s client for %s\n",
864 clnt->cl_program->name,
865 rcu_dereference(clnt->cl_xprt)->servername);
866
867 while (!list_empty(&clnt->cl_tasks)) {
868 rpc_killall_tasks(clnt);
869 wait_event_timeout(destroy_wait,
870 list_empty(&clnt->cl_tasks), 1*HZ);
871 }
872
873 rpc_release_client(clnt);
874 }
875 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
876
877
878
879
880 static struct rpc_clnt *
881 rpc_free_client(struct rpc_clnt *clnt)
882 {
883 struct rpc_clnt *parent = NULL;
884
885 dprintk_rcu("RPC: destroying %s client for %s\n",
886 clnt->cl_program->name,
887 rcu_dereference(clnt->cl_xprt)->servername);
888 if (clnt->cl_parent != clnt)
889 parent = clnt->cl_parent;
890 rpc_clnt_debugfs_unregister(clnt);
891 rpc_clnt_remove_pipedir(clnt);
892 rpc_unregister_client(clnt);
893 rpc_free_iostats(clnt->cl_metrics);
894 clnt->cl_metrics = NULL;
895 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
896 xprt_iter_destroy(&clnt->cl_xpi);
897 rpciod_down();
898 put_cred(clnt->cl_cred);
899 rpc_free_clid(clnt);
900 kfree(clnt);
901 return parent;
902 }
903
904
905
906
907 static struct rpc_clnt *
908 rpc_free_auth(struct rpc_clnt *clnt)
909 {
910 if (clnt->cl_auth == NULL)
911 return rpc_free_client(clnt);
912
913
914
915
916
917
918 atomic_inc(&clnt->cl_count);
919 rpcauth_release(clnt->cl_auth);
920 clnt->cl_auth = NULL;
921 if (atomic_dec_and_test(&clnt->cl_count))
922 return rpc_free_client(clnt);
923 return NULL;
924 }
925
926
927
928
929 void
930 rpc_release_client(struct rpc_clnt *clnt)
931 {
932 dprintk("RPC: rpc_release_client(%p)\n", clnt);
933
934 do {
935 if (list_empty(&clnt->cl_tasks))
936 wake_up(&destroy_wait);
937 if (!atomic_dec_and_test(&clnt->cl_count))
938 break;
939 clnt = rpc_free_auth(clnt);
940 } while (clnt != NULL);
941 }
942 EXPORT_SYMBOL_GPL(rpc_release_client);
943
944
945
946
947
948
949
950
951
952
953
954 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
955 const struct rpc_program *program,
956 u32 vers)
957 {
958 struct rpc_create_args args = {
959 .program = program,
960 .prognumber = program->number,
961 .version = vers,
962 .authflavor = old->cl_auth->au_flavor,
963 .cred = old->cl_cred,
964 };
965 struct rpc_clnt *clnt;
966 int err;
967
968 clnt = __rpc_clone_client(&args, old);
969 if (IS_ERR(clnt))
970 goto out;
971 err = rpc_ping(clnt);
972 if (err != 0) {
973 rpc_shutdown_client(clnt);
974 clnt = ERR_PTR(err);
975 }
976 out:
977 return clnt;
978 }
979 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
980
981 struct rpc_xprt *
982 rpc_task_get_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
983 {
984 struct rpc_xprt_switch *xps;
985
986 if (!xprt)
987 return NULL;
988 rcu_read_lock();
989 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
990 atomic_long_inc(&xps->xps_queuelen);
991 rcu_read_unlock();
992 atomic_long_inc(&xprt->queuelen);
993
994 return xprt;
995 }
996
997 static void
998 rpc_task_release_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
999 {
1000 struct rpc_xprt_switch *xps;
1001
1002 atomic_long_dec(&xprt->queuelen);
1003 rcu_read_lock();
1004 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
1005 atomic_long_dec(&xps->xps_queuelen);
1006 rcu_read_unlock();
1007
1008 xprt_put(xprt);
1009 }
1010
1011 void rpc_task_release_transport(struct rpc_task *task)
1012 {
1013 struct rpc_xprt *xprt = task->tk_xprt;
1014
1015 if (xprt) {
1016 task->tk_xprt = NULL;
1017 if (task->tk_client)
1018 rpc_task_release_xprt(task->tk_client, xprt);
1019 else
1020 xprt_put(xprt);
1021 }
1022 }
1023 EXPORT_SYMBOL_GPL(rpc_task_release_transport);
1024
1025 void rpc_task_release_client(struct rpc_task *task)
1026 {
1027 struct rpc_clnt *clnt = task->tk_client;
1028
1029 rpc_task_release_transport(task);
1030 if (clnt != NULL) {
1031
1032 spin_lock(&clnt->cl_lock);
1033 list_del(&task->tk_task);
1034 spin_unlock(&clnt->cl_lock);
1035 task->tk_client = NULL;
1036
1037 rpc_release_client(clnt);
1038 }
1039 }
1040
1041 static struct rpc_xprt *
1042 rpc_task_get_first_xprt(struct rpc_clnt *clnt)
1043 {
1044 struct rpc_xprt *xprt;
1045
1046 rcu_read_lock();
1047 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
1048 rcu_read_unlock();
1049 return rpc_task_get_xprt(clnt, xprt);
1050 }
1051
1052 static struct rpc_xprt *
1053 rpc_task_get_next_xprt(struct rpc_clnt *clnt)
1054 {
1055 return rpc_task_get_xprt(clnt, xprt_iter_get_next(&clnt->cl_xpi));
1056 }
1057
1058 static
1059 void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt)
1060 {
1061 if (task->tk_xprt)
1062 return;
1063 if (task->tk_flags & RPC_TASK_NO_ROUND_ROBIN)
1064 task->tk_xprt = rpc_task_get_first_xprt(clnt);
1065 else
1066 task->tk_xprt = rpc_task_get_next_xprt(clnt);
1067 }
1068
1069 static
1070 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
1071 {
1072
1073 if (clnt != NULL) {
1074 rpc_task_set_transport(task, clnt);
1075 task->tk_client = clnt;
1076 atomic_inc(&clnt->cl_count);
1077 if (clnt->cl_softrtry)
1078 task->tk_flags |= RPC_TASK_SOFT;
1079 if (clnt->cl_softerr)
1080 task->tk_flags |= RPC_TASK_TIMEOUT;
1081 if (clnt->cl_noretranstimeo)
1082 task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
1083 if (atomic_read(&clnt->cl_swapper))
1084 task->tk_flags |= RPC_TASK_SWAPPER;
1085
1086 spin_lock(&clnt->cl_lock);
1087 list_add_tail(&task->tk_task, &clnt->cl_tasks);
1088 spin_unlock(&clnt->cl_lock);
1089 }
1090 }
1091
1092 static void
1093 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
1094 {
1095 if (msg != NULL) {
1096 task->tk_msg.rpc_proc = msg->rpc_proc;
1097 task->tk_msg.rpc_argp = msg->rpc_argp;
1098 task->tk_msg.rpc_resp = msg->rpc_resp;
1099 if (msg->rpc_cred != NULL)
1100 task->tk_msg.rpc_cred = get_cred(msg->rpc_cred);
1101 }
1102 }
1103
1104
1105
1106
1107 static void
1108 rpc_default_callback(struct rpc_task *task, void *data)
1109 {
1110 }
1111
1112 static const struct rpc_call_ops rpc_default_ops = {
1113 .rpc_call_done = rpc_default_callback,
1114 };
1115
1116
1117
1118
1119
1120 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
1121 {
1122 struct rpc_task *task;
1123
1124 task = rpc_new_task(task_setup_data);
1125
1126 rpc_task_set_client(task, task_setup_data->rpc_client);
1127 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
1128
1129 if (task->tk_action == NULL)
1130 rpc_call_start(task);
1131
1132 atomic_inc(&task->tk_count);
1133 rpc_execute(task);
1134 return task;
1135 }
1136 EXPORT_SYMBOL_GPL(rpc_run_task);
1137
1138
1139
1140
1141
1142
1143
1144 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
1145 {
1146 struct rpc_task *task;
1147 struct rpc_task_setup task_setup_data = {
1148 .rpc_client = clnt,
1149 .rpc_message = msg,
1150 .callback_ops = &rpc_default_ops,
1151 .flags = flags,
1152 };
1153 int status;
1154
1155 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
1156 if (flags & RPC_TASK_ASYNC) {
1157 rpc_release_calldata(task_setup_data.callback_ops,
1158 task_setup_data.callback_data);
1159 return -EINVAL;
1160 }
1161
1162 task = rpc_run_task(&task_setup_data);
1163 if (IS_ERR(task))
1164 return PTR_ERR(task);
1165 status = task->tk_status;
1166 rpc_put_task(task);
1167 return status;
1168 }
1169 EXPORT_SYMBOL_GPL(rpc_call_sync);
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179 int
1180 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
1181 const struct rpc_call_ops *tk_ops, void *data)
1182 {
1183 struct rpc_task *task;
1184 struct rpc_task_setup task_setup_data = {
1185 .rpc_client = clnt,
1186 .rpc_message = msg,
1187 .callback_ops = tk_ops,
1188 .callback_data = data,
1189 .flags = flags|RPC_TASK_ASYNC,
1190 };
1191
1192 task = rpc_run_task(&task_setup_data);
1193 if (IS_ERR(task))
1194 return PTR_ERR(task);
1195 rpc_put_task(task);
1196 return 0;
1197 }
1198 EXPORT_SYMBOL_GPL(rpc_call_async);
1199
1200 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1201 static void call_bc_encode(struct rpc_task *task);
1202
1203
1204
1205
1206
1207
1208 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
1209 {
1210 struct rpc_task *task;
1211 struct rpc_task_setup task_setup_data = {
1212 .callback_ops = &rpc_default_ops,
1213 .flags = RPC_TASK_SOFTCONN |
1214 RPC_TASK_NO_RETRANS_TIMEOUT,
1215 };
1216
1217 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
1218
1219
1220
1221 task = rpc_new_task(&task_setup_data);
1222 xprt_init_bc_request(req, task);
1223
1224 task->tk_action = call_bc_encode;
1225 atomic_inc(&task->tk_count);
1226 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
1227 rpc_execute(task);
1228
1229 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
1230 return task;
1231 }
1232 #endif
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243 void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
1244 unsigned int base, unsigned int len,
1245 unsigned int hdrsize)
1246 {
1247
1248
1249
1250 hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign - 1;
1251
1252 xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len);
1253 trace_rpc_reply_pages(req);
1254 }
1255 EXPORT_SYMBOL_GPL(rpc_prepare_reply_pages);
1256
1257 void
1258 rpc_call_start(struct rpc_task *task)
1259 {
1260 task->tk_action = call_start;
1261 }
1262 EXPORT_SYMBOL_GPL(rpc_call_start);
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
1273 {
1274 size_t bytes;
1275 struct rpc_xprt *xprt;
1276
1277 rcu_read_lock();
1278 xprt = rcu_dereference(clnt->cl_xprt);
1279
1280 bytes = xprt->addrlen;
1281 if (bytes > bufsize)
1282 bytes = bufsize;
1283 memcpy(buf, &xprt->addr, bytes);
1284 rcu_read_unlock();
1285
1286 return bytes;
1287 }
1288 EXPORT_SYMBOL_GPL(rpc_peeraddr);
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
1300 enum rpc_display_format_t format)
1301 {
1302 struct rpc_xprt *xprt;
1303
1304 xprt = rcu_dereference(clnt->cl_xprt);
1305
1306 if (xprt->address_strings[format] != NULL)
1307 return xprt->address_strings[format];
1308 else
1309 return "unprintable";
1310 }
1311 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
1312
1313 static const struct sockaddr_in rpc_inaddr_loopback = {
1314 .sin_family = AF_INET,
1315 .sin_addr.s_addr = htonl(INADDR_ANY),
1316 };
1317
1318 static const struct sockaddr_in6 rpc_in6addr_loopback = {
1319 .sin6_family = AF_INET6,
1320 .sin6_addr = IN6ADDR_ANY_INIT,
1321 };
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331 static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1332 struct sockaddr *buf)
1333 {
1334 struct socket *sock;
1335 int err;
1336
1337 err = __sock_create(net, sap->sa_family,
1338 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1339 if (err < 0) {
1340 dprintk("RPC: can't create UDP socket (%d)\n", err);
1341 goto out;
1342 }
1343
1344 switch (sap->sa_family) {
1345 case AF_INET:
1346 err = kernel_bind(sock,
1347 (struct sockaddr *)&rpc_inaddr_loopback,
1348 sizeof(rpc_inaddr_loopback));
1349 break;
1350 case AF_INET6:
1351 err = kernel_bind(sock,
1352 (struct sockaddr *)&rpc_in6addr_loopback,
1353 sizeof(rpc_in6addr_loopback));
1354 break;
1355 default:
1356 err = -EAFNOSUPPORT;
1357 goto out;
1358 }
1359 if (err < 0) {
1360 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1361 goto out_release;
1362 }
1363
1364 err = kernel_connect(sock, sap, salen, 0);
1365 if (err < 0) {
1366 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1367 goto out_release;
1368 }
1369
1370 err = kernel_getsockname(sock, buf);
1371 if (err < 0) {
1372 dprintk("RPC: getsockname failed (%d)\n", err);
1373 goto out_release;
1374 }
1375
1376 err = 0;
1377 if (buf->sa_family == AF_INET6) {
1378 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1379 sin6->sin6_scope_id = 0;
1380 }
1381 dprintk("RPC: %s succeeded\n", __func__);
1382
1383 out_release:
1384 sock_release(sock);
1385 out:
1386 return err;
1387 }
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397 static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1398 {
1399 switch (family) {
1400 case AF_INET:
1401 if (buflen < sizeof(rpc_inaddr_loopback))
1402 return -EINVAL;
1403 memcpy(buf, &rpc_inaddr_loopback,
1404 sizeof(rpc_inaddr_loopback));
1405 break;
1406 case AF_INET6:
1407 if (buflen < sizeof(rpc_in6addr_loopback))
1408 return -EINVAL;
1409 memcpy(buf, &rpc_in6addr_loopback,
1410 sizeof(rpc_in6addr_loopback));
1411 break;
1412 default:
1413 dprintk("RPC: %s: address family not supported\n",
1414 __func__);
1415 return -EAFNOSUPPORT;
1416 }
1417 dprintk("RPC: %s: succeeded\n", __func__);
1418 return 0;
1419 }
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437 int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1438 {
1439 struct sockaddr_storage address;
1440 struct sockaddr *sap = (struct sockaddr *)&address;
1441 struct rpc_xprt *xprt;
1442 struct net *net;
1443 size_t salen;
1444 int err;
1445
1446 rcu_read_lock();
1447 xprt = rcu_dereference(clnt->cl_xprt);
1448 salen = xprt->addrlen;
1449 memcpy(sap, &xprt->addr, salen);
1450 net = get_net(xprt->xprt_net);
1451 rcu_read_unlock();
1452
1453 rpc_set_port(sap, 0);
1454 err = rpc_sockname(net, sap, salen, buf);
1455 put_net(net);
1456 if (err != 0)
1457
1458 return rpc_anyaddr(sap->sa_family, buf, buflen);
1459 return 0;
1460 }
1461 EXPORT_SYMBOL_GPL(rpc_localaddr);
1462
1463 void
1464 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1465 {
1466 struct rpc_xprt *xprt;
1467
1468 rcu_read_lock();
1469 xprt = rcu_dereference(clnt->cl_xprt);
1470 if (xprt->ops->set_buffer_size)
1471 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1472 rcu_read_unlock();
1473 }
1474 EXPORT_SYMBOL_GPL(rpc_setbufsize);
1475
1476
1477
1478
1479
1480
1481 struct net *rpc_net_ns(struct rpc_clnt *clnt)
1482 {
1483 struct net *ret;
1484
1485 rcu_read_lock();
1486 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1487 rcu_read_unlock();
1488 return ret;
1489 }
1490 EXPORT_SYMBOL_GPL(rpc_net_ns);
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501 size_t rpc_max_payload(struct rpc_clnt *clnt)
1502 {
1503 size_t ret;
1504
1505 rcu_read_lock();
1506 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1507 rcu_read_unlock();
1508 return ret;
1509 }
1510 EXPORT_SYMBOL_GPL(rpc_max_payload);
1511
1512
1513
1514
1515
1516 size_t rpc_max_bc_payload(struct rpc_clnt *clnt)
1517 {
1518 struct rpc_xprt *xprt;
1519 size_t ret;
1520
1521 rcu_read_lock();
1522 xprt = rcu_dereference(clnt->cl_xprt);
1523 ret = xprt->ops->bc_maxpayload(xprt);
1524 rcu_read_unlock();
1525 return ret;
1526 }
1527 EXPORT_SYMBOL_GPL(rpc_max_bc_payload);
1528
1529 unsigned int rpc_num_bc_slots(struct rpc_clnt *clnt)
1530 {
1531 struct rpc_xprt *xprt;
1532 unsigned int ret;
1533
1534 rcu_read_lock();
1535 xprt = rcu_dereference(clnt->cl_xprt);
1536 ret = xprt->ops->bc_num_slots(xprt);
1537 rcu_read_unlock();
1538 return ret;
1539 }
1540 EXPORT_SYMBOL_GPL(rpc_num_bc_slots);
1541
1542
1543
1544
1545
1546
1547 void rpc_force_rebind(struct rpc_clnt *clnt)
1548 {
1549 if (clnt->cl_autobind) {
1550 rcu_read_lock();
1551 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1552 rcu_read_unlock();
1553 }
1554 }
1555 EXPORT_SYMBOL_GPL(rpc_force_rebind);
1556
1557 static int
1558 __rpc_restart_call(struct rpc_task *task, void (*action)(struct rpc_task *))
1559 {
1560 task->tk_status = 0;
1561 task->tk_rpc_status = 0;
1562 task->tk_action = action;
1563 return 1;
1564 }
1565
1566
1567
1568
1569
1570 int
1571 rpc_restart_call(struct rpc_task *task)
1572 {
1573 return __rpc_restart_call(task, call_start);
1574 }
1575 EXPORT_SYMBOL_GPL(rpc_restart_call);
1576
1577
1578
1579
1580
1581 int
1582 rpc_restart_call_prepare(struct rpc_task *task)
1583 {
1584 if (task->tk_ops->rpc_call_prepare != NULL)
1585 return __rpc_restart_call(task, rpc_prepare_task);
1586 return rpc_restart_call(task);
1587 }
1588 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1589
1590 const char
1591 *rpc_proc_name(const struct rpc_task *task)
1592 {
1593 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1594
1595 if (proc) {
1596 if (proc->p_name)
1597 return proc->p_name;
1598 else
1599 return "NULL";
1600 } else
1601 return "no proc";
1602 }
1603
1604 static void
1605 __rpc_call_rpcerror(struct rpc_task *task, int tk_status, int rpc_status)
1606 {
1607 task->tk_rpc_status = rpc_status;
1608 rpc_exit(task, tk_status);
1609 }
1610
1611 static void
1612 rpc_call_rpcerror(struct rpc_task *task, int status)
1613 {
1614 __rpc_call_rpcerror(task, status, status);
1615 }
1616
1617
1618
1619
1620
1621
1622
1623 static void
1624 call_start(struct rpc_task *task)
1625 {
1626 struct rpc_clnt *clnt = task->tk_client;
1627 int idx = task->tk_msg.rpc_proc->p_statidx;
1628
1629 trace_rpc_request(task);
1630 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1631 clnt->cl_program->name, clnt->cl_vers,
1632 rpc_proc_name(task),
1633 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1634
1635
1636 if (clnt->cl_program->version[clnt->cl_vers])
1637 clnt->cl_program->version[clnt->cl_vers]->counts[idx]++;
1638 clnt->cl_stats->rpccnt++;
1639 task->tk_action = call_reserve;
1640 rpc_task_set_transport(task, clnt);
1641 }
1642
1643
1644
1645
1646 static void
1647 call_reserve(struct rpc_task *task)
1648 {
1649 dprint_status(task);
1650
1651 task->tk_status = 0;
1652 task->tk_action = call_reserveresult;
1653 xprt_reserve(task);
1654 }
1655
1656 static void call_retry_reserve(struct rpc_task *task);
1657
1658
1659
1660
1661 static void
1662 call_reserveresult(struct rpc_task *task)
1663 {
1664 int status = task->tk_status;
1665
1666 dprint_status(task);
1667
1668
1669
1670
1671
1672 task->tk_status = 0;
1673 if (status >= 0) {
1674 if (task->tk_rqstp) {
1675 task->tk_action = call_refresh;
1676 return;
1677 }
1678
1679 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1680 __func__, status);
1681 rpc_call_rpcerror(task, -EIO);
1682 return;
1683 }
1684
1685
1686
1687
1688
1689 if (task->tk_rqstp) {
1690 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1691 __func__, status);
1692 xprt_release(task);
1693 }
1694
1695 switch (status) {
1696 case -ENOMEM:
1697 rpc_delay(task, HZ >> 2);
1698
1699 case -EAGAIN:
1700 task->tk_action = call_retry_reserve;
1701 return;
1702 case -EIO:
1703 break;
1704 default:
1705 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1706 __func__, status);
1707 break;
1708 }
1709 rpc_call_rpcerror(task, status);
1710 }
1711
1712
1713
1714
1715 static void
1716 call_retry_reserve(struct rpc_task *task)
1717 {
1718 dprint_status(task);
1719
1720 task->tk_status = 0;
1721 task->tk_action = call_reserveresult;
1722 xprt_retry_reserve(task);
1723 }
1724
1725
1726
1727
1728 static void
1729 call_refresh(struct rpc_task *task)
1730 {
1731 dprint_status(task);
1732
1733 task->tk_action = call_refreshresult;
1734 task->tk_status = 0;
1735 task->tk_client->cl_stats->rpcauthrefresh++;
1736 rpcauth_refreshcred(task);
1737 }
1738
1739
1740
1741
1742 static void
1743 call_refreshresult(struct rpc_task *task)
1744 {
1745 int status = task->tk_status;
1746
1747 dprint_status(task);
1748
1749 task->tk_status = 0;
1750 task->tk_action = call_refresh;
1751 switch (status) {
1752 case 0:
1753 if (rpcauth_uptodatecred(task)) {
1754 task->tk_action = call_allocate;
1755 return;
1756 }
1757
1758
1759
1760
1761 case -ETIMEDOUT:
1762 rpc_delay(task, 3*HZ);
1763
1764 case -EAGAIN:
1765 status = -EACCES;
1766
1767 case -EKEYEXPIRED:
1768 if (!task->tk_cred_retry)
1769 break;
1770 task->tk_cred_retry--;
1771 dprintk("RPC: %5u %s: retry refresh creds\n",
1772 task->tk_pid, __func__);
1773 return;
1774 }
1775 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1776 task->tk_pid, __func__, status);
1777 rpc_call_rpcerror(task, status);
1778 }
1779
1780
1781
1782
1783
1784 static void
1785 call_allocate(struct rpc_task *task)
1786 {
1787 const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;
1788 struct rpc_rqst *req = task->tk_rqstp;
1789 struct rpc_xprt *xprt = req->rq_xprt;
1790 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1791 int status;
1792
1793 dprint_status(task);
1794
1795 task->tk_status = 0;
1796 task->tk_action = call_encode;
1797
1798 if (req->rq_buffer)
1799 return;
1800
1801 if (proc->p_proc != 0) {
1802 BUG_ON(proc->p_arglen == 0);
1803 if (proc->p_decode != NULL)
1804 BUG_ON(proc->p_replen == 0);
1805 }
1806
1807
1808
1809
1810
1811
1812 req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) +
1813 proc->p_arglen;
1814 req->rq_callsize <<= 2;
1815
1816
1817
1818
1819 req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + \
1820 max_t(size_t, proc->p_replen, 2);
1821 req->rq_rcvsize <<= 2;
1822
1823 status = xprt->ops->buf_alloc(task);
1824 xprt_inject_disconnect(xprt);
1825 if (status == 0)
1826 return;
1827 if (status != -ENOMEM) {
1828 rpc_call_rpcerror(task, status);
1829 return;
1830 }
1831
1832 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1833
1834 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1835 task->tk_action = call_allocate;
1836 rpc_delay(task, HZ>>4);
1837 return;
1838 }
1839
1840 rpc_call_rpcerror(task, -ERESTARTSYS);
1841 }
1842
1843 static int
1844 rpc_task_need_encode(struct rpc_task *task)
1845 {
1846 return test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) == 0 &&
1847 (!(task->tk_flags & RPC_TASK_SENT) ||
1848 !(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) ||
1849 xprt_request_need_retransmit(task));
1850 }
1851
1852 static void
1853 rpc_xdr_encode(struct rpc_task *task)
1854 {
1855 struct rpc_rqst *req = task->tk_rqstp;
1856 struct xdr_stream xdr;
1857
1858 xdr_buf_init(&req->rq_snd_buf,
1859 req->rq_buffer,
1860 req->rq_callsize);
1861 xdr_buf_init(&req->rq_rcv_buf,
1862 req->rq_rbuffer,
1863 req->rq_rcvsize);
1864
1865 req->rq_reply_bytes_recvd = 0;
1866 req->rq_snd_buf.head[0].iov_len = 0;
1867 xdr_init_encode(&xdr, &req->rq_snd_buf,
1868 req->rq_snd_buf.head[0].iov_base, req);
1869 xdr_free_bvec(&req->rq_snd_buf);
1870 if (rpc_encode_header(task, &xdr))
1871 return;
1872
1873 task->tk_status = rpcauth_wrap_req(task, &xdr);
1874 }
1875
1876
1877
1878
1879 static void
1880 call_encode(struct rpc_task *task)
1881 {
1882 if (!rpc_task_need_encode(task))
1883 goto out;
1884 dprint_status(task);
1885
1886 xprt_request_dequeue_xprt(task);
1887
1888 rpc_xdr_encode(task);
1889
1890 if (task->tk_status != 0) {
1891
1892 switch (task->tk_status) {
1893 case -EAGAIN:
1894 case -ENOMEM:
1895 rpc_delay(task, HZ >> 4);
1896 break;
1897 case -EKEYEXPIRED:
1898 if (!task->tk_cred_retry) {
1899 rpc_exit(task, task->tk_status);
1900 } else {
1901 task->tk_action = call_refresh;
1902 task->tk_cred_retry--;
1903 dprintk("RPC: %5u %s: retry refresh creds\n",
1904 task->tk_pid, __func__);
1905 }
1906 break;
1907 default:
1908 rpc_call_rpcerror(task, task->tk_status);
1909 }
1910 return;
1911 }
1912
1913
1914 if (rpc_reply_expected(task))
1915 xprt_request_enqueue_receive(task);
1916 xprt_request_enqueue_transmit(task);
1917 out:
1918 task->tk_action = call_transmit;
1919
1920 if (!xprt_bound(task->tk_xprt))
1921 task->tk_action = call_bind;
1922 else if (!xprt_connected(task->tk_xprt))
1923 task->tk_action = call_connect;
1924 }
1925
1926
1927
1928
1929
1930 static bool
1931 rpc_task_transmitted(struct rpc_task *task)
1932 {
1933 return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate);
1934 }
1935
1936 static void
1937 rpc_task_handle_transmitted(struct rpc_task *task)
1938 {
1939 xprt_end_transmit(task);
1940 task->tk_action = call_transmit_status;
1941 }
1942
1943
1944
1945
1946 static void
1947 call_bind(struct rpc_task *task)
1948 {
1949 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1950
1951 if (rpc_task_transmitted(task)) {
1952 rpc_task_handle_transmitted(task);
1953 return;
1954 }
1955
1956 if (xprt_bound(xprt)) {
1957 task->tk_action = call_connect;
1958 return;
1959 }
1960
1961 dprint_status(task);
1962
1963 task->tk_action = call_bind_status;
1964 if (!xprt_prepare_transmit(task))
1965 return;
1966
1967 xprt->ops->rpcbind(task);
1968 }
1969
1970
1971
1972
1973 static void
1974 call_bind_status(struct rpc_task *task)
1975 {
1976 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1977 int status = -EIO;
1978
1979 if (rpc_task_transmitted(task)) {
1980 rpc_task_handle_transmitted(task);
1981 return;
1982 }
1983
1984 dprint_status(task);
1985 trace_rpc_bind_status(task);
1986 if (task->tk_status >= 0)
1987 goto out_next;
1988 if (xprt_bound(xprt)) {
1989 task->tk_status = 0;
1990 goto out_next;
1991 }
1992
1993 switch (task->tk_status) {
1994 case -ENOMEM:
1995 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1996 rpc_delay(task, HZ >> 2);
1997 goto retry_timeout;
1998 case -EACCES:
1999 dprintk("RPC: %5u remote rpcbind: RPC program/version "
2000 "unavailable\n", task->tk_pid);
2001
2002 if (task->tk_msg.rpc_proc->p_proc == 0) {
2003 status = -EOPNOTSUPP;
2004 break;
2005 }
2006 if (task->tk_rebind_retry == 0)
2007 break;
2008 task->tk_rebind_retry--;
2009 rpc_delay(task, 3*HZ);
2010 goto retry_timeout;
2011 case -ENOBUFS:
2012 rpc_delay(task, HZ >> 2);
2013 goto retry_timeout;
2014 case -EAGAIN:
2015 goto retry_timeout;
2016 case -ETIMEDOUT:
2017 dprintk("RPC: %5u rpcbind request timed out\n",
2018 task->tk_pid);
2019 goto retry_timeout;
2020 case -EPFNOSUPPORT:
2021
2022 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
2023 task->tk_pid);
2024 break;
2025 case -EPROTONOSUPPORT:
2026 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
2027 task->tk_pid);
2028 goto retry_timeout;
2029 case -ECONNREFUSED:
2030 case -ECONNRESET:
2031 case -ECONNABORTED:
2032 case -ENOTCONN:
2033 case -EHOSTDOWN:
2034 case -ENETDOWN:
2035 case -EHOSTUNREACH:
2036 case -ENETUNREACH:
2037 case -EPIPE:
2038 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
2039 task->tk_pid, task->tk_status);
2040 if (!RPC_IS_SOFTCONN(task)) {
2041 rpc_delay(task, 5*HZ);
2042 goto retry_timeout;
2043 }
2044 status = task->tk_status;
2045 break;
2046 default:
2047 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
2048 task->tk_pid, -task->tk_status);
2049 }
2050
2051 rpc_call_rpcerror(task, status);
2052 return;
2053 out_next:
2054 task->tk_action = call_connect;
2055 return;
2056 retry_timeout:
2057 task->tk_status = 0;
2058 task->tk_action = call_bind;
2059 rpc_check_timeout(task);
2060 }
2061
2062
2063
2064
2065 static void
2066 call_connect(struct rpc_task *task)
2067 {
2068 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
2069
2070 if (rpc_task_transmitted(task)) {
2071 rpc_task_handle_transmitted(task);
2072 return;
2073 }
2074
2075 if (xprt_connected(xprt)) {
2076 task->tk_action = call_transmit;
2077 return;
2078 }
2079
2080 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
2081 task->tk_pid, xprt,
2082 (xprt_connected(xprt) ? "is" : "is not"));
2083
2084 task->tk_action = call_connect_status;
2085 if (task->tk_status < 0)
2086 return;
2087 if (task->tk_flags & RPC_TASK_NOCONNECT) {
2088 rpc_call_rpcerror(task, -ENOTCONN);
2089 return;
2090 }
2091 if (!xprt_prepare_transmit(task))
2092 return;
2093 xprt_connect(task);
2094 }
2095
2096
2097
2098
2099 static void
2100 call_connect_status(struct rpc_task *task)
2101 {
2102 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
2103 struct rpc_clnt *clnt = task->tk_client;
2104 int status = task->tk_status;
2105
2106 if (rpc_task_transmitted(task)) {
2107 rpc_task_handle_transmitted(task);
2108 return;
2109 }
2110
2111 dprint_status(task);
2112 trace_rpc_connect_status(task);
2113
2114 if (task->tk_status == 0) {
2115 clnt->cl_stats->netreconn++;
2116 goto out_next;
2117 }
2118 if (xprt_connected(xprt)) {
2119 task->tk_status = 0;
2120 goto out_next;
2121 }
2122
2123 task->tk_status = 0;
2124 switch (status) {
2125 case -ECONNREFUSED:
2126
2127 if (RPC_IS_SOFTCONN(task))
2128 break;
2129 if (clnt->cl_autobind) {
2130 rpc_force_rebind(clnt);
2131 goto out_retry;
2132 }
2133
2134 case -ECONNRESET:
2135 case -ECONNABORTED:
2136 case -ENETDOWN:
2137 case -ENETUNREACH:
2138 case -EHOSTUNREACH:
2139 case -EPIPE:
2140 xprt_conditional_disconnect(task->tk_rqstp->rq_xprt,
2141 task->tk_rqstp->rq_connect_cookie);
2142 if (RPC_IS_SOFTCONN(task))
2143 break;
2144
2145 rpc_delay(task, 3*HZ);
2146
2147 case -EADDRINUSE:
2148 case -ENOTCONN:
2149 case -EAGAIN:
2150 case -ETIMEDOUT:
2151 goto out_retry;
2152 case -ENOBUFS:
2153 rpc_delay(task, HZ >> 2);
2154 goto out_retry;
2155 }
2156 rpc_call_rpcerror(task, status);
2157 return;
2158 out_next:
2159 task->tk_action = call_transmit;
2160 return;
2161 out_retry:
2162
2163 task->tk_action = call_bind;
2164 rpc_check_timeout(task);
2165 }
2166
2167
2168
2169
2170 static void
2171 call_transmit(struct rpc_task *task)
2172 {
2173 if (rpc_task_transmitted(task)) {
2174 rpc_task_handle_transmitted(task);
2175 return;
2176 }
2177
2178 dprint_status(task);
2179
2180 task->tk_action = call_transmit_status;
2181 if (!xprt_prepare_transmit(task))
2182 return;
2183 task->tk_status = 0;
2184 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
2185 if (!xprt_connected(task->tk_xprt)) {
2186 task->tk_status = -ENOTCONN;
2187 return;
2188 }
2189 xprt_transmit(task);
2190 }
2191 xprt_end_transmit(task);
2192 }
2193
2194
2195
2196
2197 static void
2198 call_transmit_status(struct rpc_task *task)
2199 {
2200 task->tk_action = call_status;
2201
2202
2203
2204
2205
2206 if (rpc_task_transmitted(task)) {
2207 task->tk_status = 0;
2208 xprt_request_wait_receive(task);
2209 return;
2210 }
2211
2212 switch (task->tk_status) {
2213 default:
2214 dprint_status(task);
2215 break;
2216 case -EBADMSG:
2217 task->tk_status = 0;
2218 task->tk_action = call_encode;
2219 break;
2220
2221
2222
2223
2224
2225
2226 case -ENOBUFS:
2227 rpc_delay(task, HZ>>2);
2228
2229 case -EBADSLT:
2230 case -EAGAIN:
2231 task->tk_action = call_transmit;
2232 task->tk_status = 0;
2233 break;
2234 case -ECONNREFUSED:
2235 case -EHOSTDOWN:
2236 case -ENETDOWN:
2237 case -EHOSTUNREACH:
2238 case -ENETUNREACH:
2239 case -EPERM:
2240 if (RPC_IS_SOFTCONN(task)) {
2241 if (!task->tk_msg.rpc_proc->p_proc)
2242 trace_xprt_ping(task->tk_xprt,
2243 task->tk_status);
2244 rpc_call_rpcerror(task, task->tk_status);
2245 return;
2246 }
2247
2248 case -ECONNRESET:
2249 case -ECONNABORTED:
2250 case -EADDRINUSE:
2251 case -ENOTCONN:
2252 case -EPIPE:
2253 task->tk_action = call_bind;
2254 task->tk_status = 0;
2255 break;
2256 }
2257 rpc_check_timeout(task);
2258 }
2259
2260 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
2261 static void call_bc_transmit(struct rpc_task *task);
2262 static void call_bc_transmit_status(struct rpc_task *task);
2263
2264 static void
2265 call_bc_encode(struct rpc_task *task)
2266 {
2267 xprt_request_enqueue_transmit(task);
2268 task->tk_action = call_bc_transmit;
2269 }
2270
2271
2272
2273
2274
2275 static void
2276 call_bc_transmit(struct rpc_task *task)
2277 {
2278 task->tk_action = call_bc_transmit_status;
2279 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
2280 if (!xprt_prepare_transmit(task))
2281 return;
2282 task->tk_status = 0;
2283 xprt_transmit(task);
2284 }
2285 xprt_end_transmit(task);
2286 }
2287
2288 static void
2289 call_bc_transmit_status(struct rpc_task *task)
2290 {
2291 struct rpc_rqst *req = task->tk_rqstp;
2292
2293 if (rpc_task_transmitted(task))
2294 task->tk_status = 0;
2295
2296 dprint_status(task);
2297
2298 switch (task->tk_status) {
2299 case 0:
2300
2301 case -ENETDOWN:
2302 case -EHOSTDOWN:
2303 case -EHOSTUNREACH:
2304 case -ENETUNREACH:
2305 case -ECONNRESET:
2306 case -ECONNREFUSED:
2307 case -EADDRINUSE:
2308 case -ENOTCONN:
2309 case -EPIPE:
2310 break;
2311 case -ENOBUFS:
2312 rpc_delay(task, HZ>>2);
2313
2314 case -EBADSLT:
2315 case -EAGAIN:
2316 task->tk_status = 0;
2317 task->tk_action = call_bc_transmit;
2318 return;
2319 case -ETIMEDOUT:
2320
2321
2322
2323
2324
2325
2326
2327 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2328 "error: %d\n", task->tk_status);
2329 xprt_conditional_disconnect(req->rq_xprt,
2330 req->rq_connect_cookie);
2331 break;
2332 default:
2333
2334
2335
2336
2337 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2338 "error: %d\n", task->tk_status);
2339 break;
2340 }
2341 task->tk_action = rpc_exit_task;
2342 }
2343 #endif
2344
2345
2346
2347
2348 static void
2349 call_status(struct rpc_task *task)
2350 {
2351 struct rpc_clnt *clnt = task->tk_client;
2352 int status;
2353
2354 if (!task->tk_msg.rpc_proc->p_proc)
2355 trace_xprt_ping(task->tk_xprt, task->tk_status);
2356
2357 dprint_status(task);
2358
2359 status = task->tk_status;
2360 if (status >= 0) {
2361 task->tk_action = call_decode;
2362 return;
2363 }
2364
2365 trace_rpc_call_status(task);
2366 task->tk_status = 0;
2367 switch(status) {
2368 case -EHOSTDOWN:
2369 case -ENETDOWN:
2370 case -EHOSTUNREACH:
2371 case -ENETUNREACH:
2372 case -EPERM:
2373 if (RPC_IS_SOFTCONN(task))
2374 goto out_exit;
2375
2376
2377
2378
2379 rpc_delay(task, 3*HZ);
2380
2381 case -ETIMEDOUT:
2382 break;
2383 case -ECONNREFUSED:
2384 case -ECONNRESET:
2385 case -ECONNABORTED:
2386 case -ENOTCONN:
2387 rpc_force_rebind(clnt);
2388 break;
2389 case -EADDRINUSE:
2390 rpc_delay(task, 3*HZ);
2391
2392 case -EPIPE:
2393 case -EAGAIN:
2394 break;
2395 case -EIO:
2396
2397 goto out_exit;
2398 default:
2399 if (clnt->cl_chatty)
2400 printk("%s: RPC call returned error %d\n",
2401 clnt->cl_program->name, -status);
2402 goto out_exit;
2403 }
2404 task->tk_action = call_encode;
2405 rpc_check_timeout(task);
2406 return;
2407 out_exit:
2408 rpc_call_rpcerror(task, status);
2409 }
2410
2411 static bool
2412 rpc_check_connected(const struct rpc_rqst *req)
2413 {
2414
2415 if (!req || !req->rq_xprt)
2416 return true;
2417 return xprt_connected(req->rq_xprt);
2418 }
2419
2420 static void
2421 rpc_check_timeout(struct rpc_task *task)
2422 {
2423 struct rpc_clnt *clnt = task->tk_client;
2424
2425 if (RPC_SIGNALLED(task)) {
2426 rpc_call_rpcerror(task, -ERESTARTSYS);
2427 return;
2428 }
2429
2430 if (xprt_adjust_timeout(task->tk_rqstp) == 0)
2431 return;
2432
2433 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
2434 task->tk_timeouts++;
2435
2436 if (RPC_IS_SOFTCONN(task) && !rpc_check_connected(task->tk_rqstp)) {
2437 rpc_call_rpcerror(task, -ETIMEDOUT);
2438 return;
2439 }
2440
2441 if (RPC_IS_SOFT(task)) {
2442
2443
2444
2445
2446
2447 if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) &&
2448 rpc_check_connected(task->tk_rqstp))
2449 return;
2450
2451 if (clnt->cl_chatty) {
2452 pr_notice_ratelimited(
2453 "%s: server %s not responding, timed out\n",
2454 clnt->cl_program->name,
2455 task->tk_xprt->servername);
2456 }
2457 if (task->tk_flags & RPC_TASK_TIMEOUT)
2458 rpc_call_rpcerror(task, -ETIMEDOUT);
2459 else
2460 __rpc_call_rpcerror(task, -EIO, -ETIMEDOUT);
2461 return;
2462 }
2463
2464 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
2465 task->tk_flags |= RPC_CALL_MAJORSEEN;
2466 if (clnt->cl_chatty) {
2467 pr_notice_ratelimited(
2468 "%s: server %s not responding, still trying\n",
2469 clnt->cl_program->name,
2470 task->tk_xprt->servername);
2471 }
2472 }
2473 rpc_force_rebind(clnt);
2474
2475
2476
2477
2478 rpcauth_invalcred(task);
2479 }
2480
2481
2482
2483
2484 static void
2485 call_decode(struct rpc_task *task)
2486 {
2487 struct rpc_clnt *clnt = task->tk_client;
2488 struct rpc_rqst *req = task->tk_rqstp;
2489 struct xdr_stream xdr;
2490 int err;
2491
2492 dprint_status(task);
2493
2494 if (!task->tk_msg.rpc_proc->p_decode) {
2495 task->tk_action = rpc_exit_task;
2496 return;
2497 }
2498
2499 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
2500 if (clnt->cl_chatty) {
2501 pr_notice_ratelimited("%s: server %s OK\n",
2502 clnt->cl_program->name,
2503 task->tk_xprt->servername);
2504 }
2505 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
2506 }
2507
2508
2509
2510
2511
2512 smp_rmb();
2513
2514
2515
2516
2517
2518 err = -EAGAIN;
2519 if (!req->rq_reply_bytes_recvd)
2520 goto out;
2521
2522 req->rq_rcv_buf.len = req->rq_private_buf.len;
2523
2524
2525 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2526 sizeof(req->rq_rcv_buf)) != 0);
2527
2528 xdr_init_decode(&xdr, &req->rq_rcv_buf,
2529 req->rq_rcv_buf.head[0].iov_base, req);
2530 err = rpc_decode_header(task, &xdr);
2531 out:
2532 switch (err) {
2533 case 0:
2534 task->tk_action = rpc_exit_task;
2535 task->tk_status = rpcauth_unwrap_resp(task, &xdr);
2536 dprintk("RPC: %5u %s result %d\n",
2537 task->tk_pid, __func__, task->tk_status);
2538 return;
2539 case -EAGAIN:
2540 task->tk_status = 0;
2541 if (task->tk_client->cl_discrtry)
2542 xprt_conditional_disconnect(req->rq_xprt,
2543 req->rq_connect_cookie);
2544 task->tk_action = call_encode;
2545 rpc_check_timeout(task);
2546 break;
2547 case -EKEYREJECTED:
2548 task->tk_action = call_reserve;
2549 rpc_check_timeout(task);
2550 rpcauth_invalcred(task);
2551
2552 xprt_release(task);
2553 }
2554 }
2555
2556 static int
2557 rpc_encode_header(struct rpc_task *task, struct xdr_stream *xdr)
2558 {
2559 struct rpc_clnt *clnt = task->tk_client;
2560 struct rpc_rqst *req = task->tk_rqstp;
2561 __be32 *p;
2562 int error;
2563
2564 error = -EMSGSIZE;
2565 p = xdr_reserve_space(xdr, RPC_CALLHDRSIZE << 2);
2566 if (!p)
2567 goto out_fail;
2568 *p++ = req->rq_xid;
2569 *p++ = rpc_call;
2570 *p++ = cpu_to_be32(RPC_VERSION);
2571 *p++ = cpu_to_be32(clnt->cl_prog);
2572 *p++ = cpu_to_be32(clnt->cl_vers);
2573 *p = cpu_to_be32(task->tk_msg.rpc_proc->p_proc);
2574
2575 error = rpcauth_marshcred(task, xdr);
2576 if (error < 0)
2577 goto out_fail;
2578 return 0;
2579 out_fail:
2580 trace_rpc_bad_callhdr(task);
2581 rpc_call_rpcerror(task, error);
2582 return error;
2583 }
2584
2585 static noinline int
2586 rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
2587 {
2588 struct rpc_clnt *clnt = task->tk_client;
2589 int error;
2590 __be32 *p;
2591
2592
2593
2594
2595
2596
2597 if (task->tk_rqstp->rq_rcv_buf.len & 3)
2598 goto out_unparsable;
2599
2600 p = xdr_inline_decode(xdr, 3 * sizeof(*p));
2601 if (!p)
2602 goto out_unparsable;
2603 p++;
2604 if (*p++ != rpc_reply)
2605 goto out_unparsable;
2606 if (*p++ != rpc_msg_accepted)
2607 goto out_msg_denied;
2608
2609 error = rpcauth_checkverf(task, xdr);
2610 if (error)
2611 goto out_verifier;
2612
2613 p = xdr_inline_decode(xdr, sizeof(*p));
2614 if (!p)
2615 goto out_unparsable;
2616 switch (*p) {
2617 case rpc_success:
2618 return 0;
2619 case rpc_prog_unavail:
2620 trace_rpc__prog_unavail(task);
2621 error = -EPFNOSUPPORT;
2622 goto out_err;
2623 case rpc_prog_mismatch:
2624 trace_rpc__prog_mismatch(task);
2625 error = -EPROTONOSUPPORT;
2626 goto out_err;
2627 case rpc_proc_unavail:
2628 trace_rpc__proc_unavail(task);
2629 error = -EOPNOTSUPP;
2630 goto out_err;
2631 case rpc_garbage_args:
2632 case rpc_system_err:
2633 trace_rpc__garbage_args(task);
2634 error = -EIO;
2635 break;
2636 default:
2637 goto out_unparsable;
2638 }
2639
2640 out_garbage:
2641 clnt->cl_stats->rpcgarbage++;
2642 if (task->tk_garb_retry) {
2643 task->tk_garb_retry--;
2644 task->tk_action = call_encode;
2645 return -EAGAIN;
2646 }
2647 out_err:
2648 rpc_call_rpcerror(task, error);
2649 return error;
2650
2651 out_unparsable:
2652 trace_rpc__unparsable(task);
2653 error = -EIO;
2654 goto out_garbage;
2655
2656 out_verifier:
2657 trace_rpc_bad_verifier(task);
2658 goto out_garbage;
2659
2660 out_msg_denied:
2661 error = -EACCES;
2662 p = xdr_inline_decode(xdr, sizeof(*p));
2663 if (!p)
2664 goto out_unparsable;
2665 switch (*p++) {
2666 case rpc_auth_error:
2667 break;
2668 case rpc_mismatch:
2669 trace_rpc__mismatch(task);
2670 error = -EPROTONOSUPPORT;
2671 goto out_err;
2672 default:
2673 goto out_unparsable;
2674 }
2675
2676 p = xdr_inline_decode(xdr, sizeof(*p));
2677 if (!p)
2678 goto out_unparsable;
2679 switch (*p++) {
2680 case rpc_autherr_rejectedcred:
2681 case rpc_autherr_rejectedverf:
2682 case rpcsec_gsserr_credproblem:
2683 case rpcsec_gsserr_ctxproblem:
2684 if (!task->tk_cred_retry)
2685 break;
2686 task->tk_cred_retry--;
2687 trace_rpc__stale_creds(task);
2688 return -EKEYREJECTED;
2689 case rpc_autherr_badcred:
2690 case rpc_autherr_badverf:
2691
2692 if (!task->tk_garb_retry)
2693 break;
2694 task->tk_garb_retry--;
2695 trace_rpc__bad_creds(task);
2696 task->tk_action = call_encode;
2697 return -EAGAIN;
2698 case rpc_autherr_tooweak:
2699 trace_rpc__auth_tooweak(task);
2700 pr_warn("RPC: server %s requires stronger authentication.\n",
2701 task->tk_xprt->servername);
2702 break;
2703 default:
2704 goto out_unparsable;
2705 }
2706 goto out_err;
2707 }
2708
2709 static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2710 const void *obj)
2711 {
2712 }
2713
2714 static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2715 void *obj)
2716 {
2717 return 0;
2718 }
2719
2720 static const struct rpc_procinfo rpcproc_null = {
2721 .p_encode = rpcproc_encode_null,
2722 .p_decode = rpcproc_decode_null,
2723 };
2724
2725 static int rpc_ping(struct rpc_clnt *clnt)
2726 {
2727 struct rpc_message msg = {
2728 .rpc_proc = &rpcproc_null,
2729 };
2730 int err;
2731 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN |
2732 RPC_TASK_NULLCREDS);
2733 return err;
2734 }
2735
2736 static
2737 struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt,
2738 struct rpc_xprt *xprt, struct rpc_cred *cred, int flags,
2739 const struct rpc_call_ops *ops, void *data)
2740 {
2741 struct rpc_message msg = {
2742 .rpc_proc = &rpcproc_null,
2743 };
2744 struct rpc_task_setup task_setup_data = {
2745 .rpc_client = clnt,
2746 .rpc_xprt = xprt,
2747 .rpc_message = &msg,
2748 .rpc_op_cred = cred,
2749 .callback_ops = (ops != NULL) ? ops : &rpc_default_ops,
2750 .callback_data = data,
2751 .flags = flags | RPC_TASK_NULLCREDS,
2752 };
2753
2754 return rpc_run_task(&task_setup_data);
2755 }
2756
2757 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2758 {
2759 return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL);
2760 }
2761 EXPORT_SYMBOL_GPL(rpc_call_null);
2762
2763 struct rpc_cb_add_xprt_calldata {
2764 struct rpc_xprt_switch *xps;
2765 struct rpc_xprt *xprt;
2766 };
2767
2768 static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata)
2769 {
2770 struct rpc_cb_add_xprt_calldata *data = calldata;
2771
2772 if (task->tk_status == 0)
2773 rpc_xprt_switch_add_xprt(data->xps, data->xprt);
2774 }
2775
2776 static void rpc_cb_add_xprt_release(void *calldata)
2777 {
2778 struct rpc_cb_add_xprt_calldata *data = calldata;
2779
2780 xprt_put(data->xprt);
2781 xprt_switch_put(data->xps);
2782 kfree(data);
2783 }
2784
2785 static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = {
2786 .rpc_call_done = rpc_cb_add_xprt_done,
2787 .rpc_release = rpc_cb_add_xprt_release,
2788 };
2789
2790
2791
2792
2793
2794
2795
2796
2797 int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
2798 struct rpc_xprt_switch *xps, struct rpc_xprt *xprt,
2799 void *dummy)
2800 {
2801 struct rpc_cb_add_xprt_calldata *data;
2802 struct rpc_task *task;
2803
2804 data = kmalloc(sizeof(*data), GFP_NOFS);
2805 if (!data)
2806 return -ENOMEM;
2807 data->xps = xprt_switch_get(xps);
2808 data->xprt = xprt_get(xprt);
2809 if (rpc_xprt_switch_has_addr(data->xps, (struct sockaddr *)&xprt->addr)) {
2810 rpc_cb_add_xprt_release(data);
2811 goto success;
2812 }
2813
2814 task = rpc_call_null_helper(clnt, xprt, NULL,
2815 RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC|RPC_TASK_NULLCREDS,
2816 &rpc_cb_add_xprt_call_ops, data);
2817 if (IS_ERR(task))
2818 return PTR_ERR(task);
2819 rpc_put_task(task);
2820 success:
2821 return 1;
2822 }
2823 EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt);
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843 int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt,
2844 struct rpc_xprt_switch *xps,
2845 struct rpc_xprt *xprt,
2846 void *data)
2847 {
2848 struct rpc_task *task;
2849 struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data;
2850 int status = -EADDRINUSE;
2851
2852 xprt = xprt_get(xprt);
2853 xprt_switch_get(xps);
2854
2855 if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr))
2856 goto out_err;
2857
2858
2859 task = rpc_call_null_helper(clnt, xprt, NULL,
2860 RPC_TASK_SOFT | RPC_TASK_SOFTCONN | RPC_TASK_NULLCREDS,
2861 NULL, NULL);
2862 if (IS_ERR(task)) {
2863 status = PTR_ERR(task);
2864 goto out_err;
2865 }
2866 status = task->tk_status;
2867 rpc_put_task(task);
2868
2869 if (status < 0)
2870 goto out_err;
2871
2872
2873 xtest->add_xprt_test(clnt, xprt, xtest->data);
2874
2875 xprt_put(xprt);
2876 xprt_switch_put(xps);
2877
2878
2879 return 1;
2880 out_err:
2881 xprt_put(xprt);
2882 xprt_switch_put(xps);
2883 pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n",
2884 status, xprt->address_strings[RPC_DISPLAY_ADDR]);
2885 return status;
2886 }
2887 EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt);
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902 int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
2903 struct xprt_create *xprtargs,
2904 int (*setup)(struct rpc_clnt *,
2905 struct rpc_xprt_switch *,
2906 struct rpc_xprt *,
2907 void *),
2908 void *data)
2909 {
2910 struct rpc_xprt_switch *xps;
2911 struct rpc_xprt *xprt;
2912 unsigned long connect_timeout;
2913 unsigned long reconnect_timeout;
2914 unsigned char resvport;
2915 int ret = 0;
2916
2917 rcu_read_lock();
2918 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2919 xprt = xprt_iter_xprt(&clnt->cl_xpi);
2920 if (xps == NULL || xprt == NULL) {
2921 rcu_read_unlock();
2922 xprt_switch_put(xps);
2923 return -EAGAIN;
2924 }
2925 resvport = xprt->resvport;
2926 connect_timeout = xprt->connect_timeout;
2927 reconnect_timeout = xprt->max_reconnect_timeout;
2928 rcu_read_unlock();
2929
2930 xprt = xprt_create_transport(xprtargs);
2931 if (IS_ERR(xprt)) {
2932 ret = PTR_ERR(xprt);
2933 goto out_put_switch;
2934 }
2935 xprt->resvport = resvport;
2936 if (xprt->ops->set_connect_timeout != NULL)
2937 xprt->ops->set_connect_timeout(xprt,
2938 connect_timeout,
2939 reconnect_timeout);
2940
2941 rpc_xprt_switch_set_roundrobin(xps);
2942 if (setup) {
2943 ret = setup(clnt, xps, xprt, data);
2944 if (ret != 0)
2945 goto out_put_xprt;
2946 }
2947 rpc_xprt_switch_add_xprt(xps, xprt);
2948 out_put_xprt:
2949 xprt_put(xprt);
2950 out_put_switch:
2951 xprt_switch_put(xps);
2952 return ret;
2953 }
2954 EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt);
2955
2956 struct connect_timeout_data {
2957 unsigned long connect_timeout;
2958 unsigned long reconnect_timeout;
2959 };
2960
2961 static int
2962 rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt,
2963 struct rpc_xprt *xprt,
2964 void *data)
2965 {
2966 struct connect_timeout_data *timeo = data;
2967
2968 if (xprt->ops->set_connect_timeout)
2969 xprt->ops->set_connect_timeout(xprt,
2970 timeo->connect_timeout,
2971 timeo->reconnect_timeout);
2972 return 0;
2973 }
2974
2975 void
2976 rpc_set_connect_timeout(struct rpc_clnt *clnt,
2977 unsigned long connect_timeout,
2978 unsigned long reconnect_timeout)
2979 {
2980 struct connect_timeout_data timeout = {
2981 .connect_timeout = connect_timeout,
2982 .reconnect_timeout = reconnect_timeout,
2983 };
2984 rpc_clnt_iterate_for_each_xprt(clnt,
2985 rpc_xprt_set_connect_timeout,
2986 &timeout);
2987 }
2988 EXPORT_SYMBOL_GPL(rpc_set_connect_timeout);
2989
2990 void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt)
2991 {
2992 rcu_read_lock();
2993 xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2994 rcu_read_unlock();
2995 }
2996 EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put);
2997
2998 void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
2999 {
3000 rcu_read_lock();
3001 rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch),
3002 xprt);
3003 rcu_read_unlock();
3004 }
3005 EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt);
3006
3007 bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
3008 const struct sockaddr *sap)
3009 {
3010 struct rpc_xprt_switch *xps;
3011 bool ret;
3012
3013 rcu_read_lock();
3014 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
3015 ret = rpc_xprt_switch_has_addr(xps, sap);
3016 rcu_read_unlock();
3017 return ret;
3018 }
3019 EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr);
3020
3021 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3022 static void rpc_show_header(void)
3023 {
3024 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
3025 "-timeout ---ops--\n");
3026 }
3027
3028 static void rpc_show_task(const struct rpc_clnt *clnt,
3029 const struct rpc_task *task)
3030 {
3031 const char *rpc_waitq = "none";
3032
3033 if (RPC_IS_QUEUED(task))
3034 rpc_waitq = rpc_qname(task->tk_waitqueue);
3035
3036 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
3037 task->tk_pid, task->tk_flags, task->tk_status,
3038 clnt, task->tk_rqstp, rpc_task_timeout(task), task->tk_ops,
3039 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
3040 task->tk_action, rpc_waitq);
3041 }
3042
3043 void rpc_show_tasks(struct net *net)
3044 {
3045 struct rpc_clnt *clnt;
3046 struct rpc_task *task;
3047 int header = 0;
3048 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
3049
3050 spin_lock(&sn->rpc_client_lock);
3051 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
3052 spin_lock(&clnt->cl_lock);
3053 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
3054 if (!header) {
3055 rpc_show_header();
3056 header++;
3057 }
3058 rpc_show_task(clnt, task);
3059 }
3060 spin_unlock(&clnt->cl_lock);
3061 }
3062 spin_unlock(&sn->rpc_client_lock);
3063 }
3064 #endif
3065
3066 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
3067 static int
3068 rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt,
3069 struct rpc_xprt *xprt,
3070 void *dummy)
3071 {
3072 return xprt_enable_swap(xprt);
3073 }
3074
3075 int
3076 rpc_clnt_swap_activate(struct rpc_clnt *clnt)
3077 {
3078 if (atomic_inc_return(&clnt->cl_swapper) == 1)
3079 return rpc_clnt_iterate_for_each_xprt(clnt,
3080 rpc_clnt_swap_activate_callback, NULL);
3081 return 0;
3082 }
3083 EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
3084
3085 static int
3086 rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt,
3087 struct rpc_xprt *xprt,
3088 void *dummy)
3089 {
3090 xprt_disable_swap(xprt);
3091 return 0;
3092 }
3093
3094 void
3095 rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
3096 {
3097 if (atomic_dec_if_positive(&clnt->cl_swapper) == 0)
3098 rpc_clnt_iterate_for_each_xprt(clnt,
3099 rpc_clnt_swap_deactivate_callback, NULL);
3100 }
3101 EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
3102 #endif