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1 | /* |
2 | * linux/net/sunrpc/clnt.c |
3 | * |
4 | * This file contains the high-level RPC interface. |
5 | * It is modeled as a finite state machine to support both synchronous |
6 | * and asynchronous requests. |
7 | * |
8 | * - RPC header generation and argument serialization. |
9 | * - Credential refresh. |
10 | * - TCP connect handling. |
11 | * - Retry of operation when it is suspected the operation failed because |
12 | * of uid squashing on the server, or when the credentials were stale |
13 | * and need to be refreshed, or when a packet was damaged in transit. |
14 | * This may be have to be moved to the VFS layer. |
15 | * |
16 | * NB: BSD uses a more intelligent approach to guessing when a request |
17 | * or reply has been lost by keeping the RTO estimate for each procedure. |
18 | * We currently make do with a constant timeout value. |
19 | * |
20 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
21 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> |
22 | */ |
23 | |
24 | #include <asm/system.h> |
25 | |
26 | #include <linux/module.h> |
27 | #include <linux/types.h> |
28 | #include <linux/kallsyms.h> |
29 | #include <linux/mm.h> |
30 | #include <linux/namei.h> |
31 | #include <linux/mount.h> |
32 | #include <linux/slab.h> |
33 | #include <linux/utsname.h> |
34 | #include <linux/workqueue.h> |
35 | #include <linux/in6.h> |
36 | |
37 | #include <linux/sunrpc/clnt.h> |
38 | #include <linux/sunrpc/rpc_pipe_fs.h> |
39 | #include <linux/sunrpc/metrics.h> |
40 | #include <linux/sunrpc/bc_xprt.h> |
41 | |
42 | #include "sunrpc.h" |
43 | |
44 | #ifdef RPC_DEBUG |
45 | # define RPCDBG_FACILITY RPCDBG_CALL |
46 | #endif |
47 | |
48 | #define dprint_status(t) \ |
49 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ |
50 | __func__, t->tk_status) |
51 | |
52 | /* |
53 | * All RPC clients are linked into this list |
54 | */ |
55 | static LIST_HEAD(all_clients); |
56 | static DEFINE_SPINLOCK(rpc_client_lock); |
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_decode(struct rpc_task *task); |
66 | static void call_bind(struct rpc_task *task); |
67 | static void call_bind_status(struct rpc_task *task); |
68 | static void call_transmit(struct rpc_task *task); |
69 | #if defined(CONFIG_NFS_V4_1) |
70 | static void call_bc_transmit(struct rpc_task *task); |
71 | #endif /* CONFIG_NFS_V4_1 */ |
72 | static void call_status(struct rpc_task *task); |
73 | static void call_transmit_status(struct rpc_task *task); |
74 | static void call_refresh(struct rpc_task *task); |
75 | static void call_refreshresult(struct rpc_task *task); |
76 | static void call_timeout(struct rpc_task *task); |
77 | static void call_connect(struct rpc_task *task); |
78 | static void call_connect_status(struct rpc_task *task); |
79 | |
80 | static __be32 *rpc_encode_header(struct rpc_task *task); |
81 | static __be32 *rpc_verify_header(struct rpc_task *task); |
82 | static int rpc_ping(struct rpc_clnt *clnt); |
83 | |
84 | static void rpc_register_client(struct rpc_clnt *clnt) |
85 | { |
86 | spin_lock(&rpc_client_lock); |
87 | list_add(&clnt->cl_clients, &all_clients); |
88 | spin_unlock(&rpc_client_lock); |
89 | } |
90 | |
91 | static void rpc_unregister_client(struct rpc_clnt *clnt) |
92 | { |
93 | spin_lock(&rpc_client_lock); |
94 | list_del(&clnt->cl_clients); |
95 | spin_unlock(&rpc_client_lock); |
96 | } |
97 | |
98 | static int |
99 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) |
100 | { |
101 | static uint32_t clntid; |
102 | struct nameidata nd; |
103 | struct path path; |
104 | char name[15]; |
105 | struct qstr q = { |
106 | .name = name, |
107 | }; |
108 | int error; |
109 | |
110 | clnt->cl_path.mnt = ERR_PTR(-ENOENT); |
111 | clnt->cl_path.dentry = ERR_PTR(-ENOENT); |
112 | if (dir_name == NULL) |
113 | return 0; |
114 | |
115 | path.mnt = rpc_get_mount(); |
116 | if (IS_ERR(path.mnt)) |
117 | return PTR_ERR(path.mnt); |
118 | error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd); |
119 | if (error) |
120 | goto err; |
121 | |
122 | for (;;) { |
123 | q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
124 | name[sizeof(name) - 1] = '\0'; |
125 | q.hash = full_name_hash(q.name, q.len); |
126 | path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt); |
127 | if (!IS_ERR(path.dentry)) |
128 | break; |
129 | error = PTR_ERR(path.dentry); |
130 | if (error != -EEXIST) { |
131 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" |
132 | " %s/%s, error %d\n", |
133 | dir_name, name, error); |
134 | goto err_path_put; |
135 | } |
136 | } |
137 | path_put(&nd.path); |
138 | clnt->cl_path = path; |
139 | return 0; |
140 | err_path_put: |
141 | path_put(&nd.path); |
142 | err: |
143 | rpc_put_mount(); |
144 | return error; |
145 | } |
146 | |
147 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
148 | { |
149 | struct rpc_program *program = args->program; |
150 | struct rpc_version *version; |
151 | struct rpc_clnt *clnt = NULL; |
152 | struct rpc_auth *auth; |
153 | int err; |
154 | size_t len; |
155 | |
156 | /* sanity check the name before trying to print it */ |
157 | err = -EINVAL; |
158 | len = strlen(args->servername); |
159 | if (len > RPC_MAXNETNAMELEN) |
160 | goto out_no_rpciod; |
161 | len++; |
162 | |
163 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
164 | program->name, args->servername, xprt); |
165 | |
166 | err = rpciod_up(); |
167 | if (err) |
168 | goto out_no_rpciod; |
169 | err = -EINVAL; |
170 | if (!xprt) |
171 | goto out_no_xprt; |
172 | |
173 | if (args->version >= program->nrvers) |
174 | goto out_err; |
175 | version = program->version[args->version]; |
176 | if (version == NULL) |
177 | goto out_err; |
178 | |
179 | err = -ENOMEM; |
180 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
181 | if (!clnt) |
182 | goto out_err; |
183 | clnt->cl_parent = clnt; |
184 | |
185 | clnt->cl_server = clnt->cl_inline_name; |
186 | if (len > sizeof(clnt->cl_inline_name)) { |
187 | char *buf = kmalloc(len, GFP_KERNEL); |
188 | if (buf != NULL) |
189 | clnt->cl_server = buf; |
190 | else |
191 | len = sizeof(clnt->cl_inline_name); |
192 | } |
193 | strlcpy(clnt->cl_server, args->servername, len); |
194 | |
195 | clnt->cl_xprt = xprt; |
196 | clnt->cl_procinfo = version->procs; |
197 | clnt->cl_maxproc = version->nrprocs; |
198 | clnt->cl_protname = program->name; |
199 | clnt->cl_prog = args->prognumber ? : program->number; |
200 | clnt->cl_vers = version->number; |
201 | clnt->cl_stats = program->stats; |
202 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
203 | err = -ENOMEM; |
204 | if (clnt->cl_metrics == NULL) |
205 | goto out_no_stats; |
206 | clnt->cl_program = program; |
207 | INIT_LIST_HEAD(&clnt->cl_tasks); |
208 | spin_lock_init(&clnt->cl_lock); |
209 | |
210 | if (!xprt_bound(clnt->cl_xprt)) |
211 | clnt->cl_autobind = 1; |
212 | |
213 | clnt->cl_timeout = xprt->timeout; |
214 | if (args->timeout != NULL) { |
215 | memcpy(&clnt->cl_timeout_default, args->timeout, |
216 | sizeof(clnt->cl_timeout_default)); |
217 | clnt->cl_timeout = &clnt->cl_timeout_default; |
218 | } |
219 | |
220 | clnt->cl_rtt = &clnt->cl_rtt_default; |
221 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
222 | clnt->cl_principal = NULL; |
223 | if (args->client_name) { |
224 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); |
225 | if (!clnt->cl_principal) |
226 | goto out_no_principal; |
227 | } |
228 | |
229 | atomic_set(&clnt->cl_count, 1); |
230 | |
231 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
232 | if (err < 0) |
233 | goto out_no_path; |
234 | |
235 | auth = rpcauth_create(args->authflavor, clnt); |
236 | if (IS_ERR(auth)) { |
237 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
238 | args->authflavor); |
239 | err = PTR_ERR(auth); |
240 | goto out_no_auth; |
241 | } |
242 | |
243 | /* save the nodename */ |
244 | clnt->cl_nodelen = strlen(init_utsname()->nodename); |
245 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
246 | clnt->cl_nodelen = UNX_MAXNODENAME; |
247 | memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen); |
248 | rpc_register_client(clnt); |
249 | return clnt; |
250 | |
251 | out_no_auth: |
252 | if (!IS_ERR(clnt->cl_path.dentry)) { |
253 | rpc_remove_client_dir(clnt->cl_path.dentry); |
254 | rpc_put_mount(); |
255 | } |
256 | out_no_path: |
257 | kfree(clnt->cl_principal); |
258 | out_no_principal: |
259 | rpc_free_iostats(clnt->cl_metrics); |
260 | out_no_stats: |
261 | if (clnt->cl_server != clnt->cl_inline_name) |
262 | kfree(clnt->cl_server); |
263 | kfree(clnt); |
264 | out_err: |
265 | xprt_put(xprt); |
266 | out_no_xprt: |
267 | rpciod_down(); |
268 | out_no_rpciod: |
269 | return ERR_PTR(err); |
270 | } |
271 | |
272 | /* |
273 | * rpc_create - create an RPC client and transport with one call |
274 | * @args: rpc_clnt create argument structure |
275 | * |
276 | * Creates and initializes an RPC transport and an RPC client. |
277 | * |
278 | * It can ping the server in order to determine if it is up, and to see if |
279 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables |
280 | * this behavior so asynchronous tasks can also use rpc_create. |
281 | */ |
282 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) |
283 | { |
284 | struct rpc_xprt *xprt; |
285 | struct rpc_clnt *clnt; |
286 | struct xprt_create xprtargs = { |
287 | .ident = args->protocol, |
288 | .srcaddr = args->saddress, |
289 | .dstaddr = args->address, |
290 | .addrlen = args->addrsize, |
291 | .bc_xprt = args->bc_xprt, |
292 | }; |
293 | char servername[48]; |
294 | |
295 | /* |
296 | * If the caller chooses not to specify a hostname, whip |
297 | * up a string representation of the passed-in address. |
298 | */ |
299 | if (args->servername == NULL) { |
300 | servername[0] = '\0'; |
301 | switch (args->address->sa_family) { |
302 | case AF_INET: { |
303 | struct sockaddr_in *sin = |
304 | (struct sockaddr_in *)args->address; |
305 | snprintf(servername, sizeof(servername), "%pI4", |
306 | &sin->sin_addr.s_addr); |
307 | break; |
308 | } |
309 | case AF_INET6: { |
310 | struct sockaddr_in6 *sin = |
311 | (struct sockaddr_in6 *)args->address; |
312 | snprintf(servername, sizeof(servername), "%pI6", |
313 | &sin->sin6_addr); |
314 | break; |
315 | } |
316 | default: |
317 | /* caller wants default server name, but |
318 | * address family isn't recognized. */ |
319 | return ERR_PTR(-EINVAL); |
320 | } |
321 | args->servername = servername; |
322 | } |
323 | |
324 | xprt = xprt_create_transport(&xprtargs); |
325 | if (IS_ERR(xprt)) |
326 | return (struct rpc_clnt *)xprt; |
327 | |
328 | /* |
329 | * By default, kernel RPC client connects from a reserved port. |
330 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, |
331 | * but it is always enabled for rpciod, which handles the connect |
332 | * operation. |
333 | */ |
334 | xprt->resvport = 1; |
335 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) |
336 | xprt->resvport = 0; |
337 | |
338 | clnt = rpc_new_client(args, xprt); |
339 | if (IS_ERR(clnt)) |
340 | return clnt; |
341 | |
342 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { |
343 | int err = rpc_ping(clnt); |
344 | if (err != 0) { |
345 | rpc_shutdown_client(clnt); |
346 | return ERR_PTR(err); |
347 | } |
348 | } |
349 | |
350 | clnt->cl_softrtry = 1; |
351 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) |
352 | clnt->cl_softrtry = 0; |
353 | |
354 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
355 | clnt->cl_autobind = 1; |
356 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
357 | clnt->cl_discrtry = 1; |
358 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
359 | clnt->cl_chatty = 1; |
360 | |
361 | return clnt; |
362 | } |
363 | EXPORT_SYMBOL_GPL(rpc_create); |
364 | |
365 | /* |
366 | * This function clones the RPC client structure. It allows us to share the |
367 | * same transport while varying parameters such as the authentication |
368 | * flavour. |
369 | */ |
370 | struct rpc_clnt * |
371 | rpc_clone_client(struct rpc_clnt *clnt) |
372 | { |
373 | struct rpc_clnt *new; |
374 | int err = -ENOMEM; |
375 | |
376 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
377 | if (!new) |
378 | goto out_no_clnt; |
379 | new->cl_parent = clnt; |
380 | /* Turn off autobind on clones */ |
381 | new->cl_autobind = 0; |
382 | INIT_LIST_HEAD(&new->cl_tasks); |
383 | spin_lock_init(&new->cl_lock); |
384 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
385 | new->cl_metrics = rpc_alloc_iostats(clnt); |
386 | if (new->cl_metrics == NULL) |
387 | goto out_no_stats; |
388 | if (clnt->cl_principal) { |
389 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); |
390 | if (new->cl_principal == NULL) |
391 | goto out_no_principal; |
392 | } |
393 | atomic_set(&new->cl_count, 1); |
394 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
395 | if (err != 0) |
396 | goto out_no_path; |
397 | if (new->cl_auth) |
398 | atomic_inc(&new->cl_auth->au_count); |
399 | xprt_get(clnt->cl_xprt); |
400 | atomic_inc(&clnt->cl_count); |
401 | rpc_register_client(new); |
402 | rpciod_up(); |
403 | return new; |
404 | out_no_path: |
405 | kfree(new->cl_principal); |
406 | out_no_principal: |
407 | rpc_free_iostats(new->cl_metrics); |
408 | out_no_stats: |
409 | kfree(new); |
410 | out_no_clnt: |
411 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
412 | return ERR_PTR(err); |
413 | } |
414 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
415 | |
416 | /* |
417 | * Kill all tasks for the given client. |
418 | * XXX: kill their descendants as well? |
419 | */ |
420 | void rpc_killall_tasks(struct rpc_clnt *clnt) |
421 | { |
422 | struct rpc_task *rovr; |
423 | |
424 | |
425 | if (list_empty(&clnt->cl_tasks)) |
426 | return; |
427 | dprintk("RPC: killing all tasks for client %p\n", clnt); |
428 | /* |
429 | * Spin lock all_tasks to prevent changes... |
430 | */ |
431 | spin_lock(&clnt->cl_lock); |
432 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { |
433 | if (!RPC_IS_ACTIVATED(rovr)) |
434 | continue; |
435 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { |
436 | rovr->tk_flags |= RPC_TASK_KILLED; |
437 | rpc_exit(rovr, -EIO); |
438 | rpc_wake_up_queued_task(rovr->tk_waitqueue, rovr); |
439 | } |
440 | } |
441 | spin_unlock(&clnt->cl_lock); |
442 | } |
443 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); |
444 | |
445 | /* |
446 | * Properly shut down an RPC client, terminating all outstanding |
447 | * requests. |
448 | */ |
449 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
450 | { |
451 | dprintk("RPC: shutting down %s client for %s\n", |
452 | clnt->cl_protname, clnt->cl_server); |
453 | |
454 | while (!list_empty(&clnt->cl_tasks)) { |
455 | rpc_killall_tasks(clnt); |
456 | wait_event_timeout(destroy_wait, |
457 | list_empty(&clnt->cl_tasks), 1*HZ); |
458 | } |
459 | |
460 | rpc_release_client(clnt); |
461 | } |
462 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
463 | |
464 | /* |
465 | * Free an RPC client |
466 | */ |
467 | static void |
468 | rpc_free_client(struct rpc_clnt *clnt) |
469 | { |
470 | dprintk("RPC: destroying %s client for %s\n", |
471 | clnt->cl_protname, clnt->cl_server); |
472 | if (!IS_ERR(clnt->cl_path.dentry)) { |
473 | rpc_remove_client_dir(clnt->cl_path.dentry); |
474 | rpc_put_mount(); |
475 | } |
476 | if (clnt->cl_parent != clnt) { |
477 | rpc_release_client(clnt->cl_parent); |
478 | goto out_free; |
479 | } |
480 | if (clnt->cl_server != clnt->cl_inline_name) |
481 | kfree(clnt->cl_server); |
482 | out_free: |
483 | rpc_unregister_client(clnt); |
484 | rpc_free_iostats(clnt->cl_metrics); |
485 | kfree(clnt->cl_principal); |
486 | clnt->cl_metrics = NULL; |
487 | xprt_put(clnt->cl_xprt); |
488 | rpciod_down(); |
489 | kfree(clnt); |
490 | } |
491 | |
492 | /* |
493 | * Free an RPC client |
494 | */ |
495 | static void |
496 | rpc_free_auth(struct rpc_clnt *clnt) |
497 | { |
498 | if (clnt->cl_auth == NULL) { |
499 | rpc_free_client(clnt); |
500 | return; |
501 | } |
502 | |
503 | /* |
504 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to |
505 | * release remaining GSS contexts. This mechanism ensures |
506 | * that it can do so safely. |
507 | */ |
508 | atomic_inc(&clnt->cl_count); |
509 | rpcauth_release(clnt->cl_auth); |
510 | clnt->cl_auth = NULL; |
511 | if (atomic_dec_and_test(&clnt->cl_count)) |
512 | rpc_free_client(clnt); |
513 | } |
514 | |
515 | /* |
516 | * Release reference to the RPC client |
517 | */ |
518 | void |
519 | rpc_release_client(struct rpc_clnt *clnt) |
520 | { |
521 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
522 | |
523 | if (list_empty(&clnt->cl_tasks)) |
524 | wake_up(&destroy_wait); |
525 | if (atomic_dec_and_test(&clnt->cl_count)) |
526 | rpc_free_auth(clnt); |
527 | } |
528 | |
529 | /** |
530 | * rpc_bind_new_program - bind a new RPC program to an existing client |
531 | * @old: old rpc_client |
532 | * @program: rpc program to set |
533 | * @vers: rpc program version |
534 | * |
535 | * Clones the rpc client and sets up a new RPC program. This is mainly |
536 | * of use for enabling different RPC programs to share the same transport. |
537 | * The Sun NFSv2/v3 ACL protocol can do this. |
538 | */ |
539 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, |
540 | struct rpc_program *program, |
541 | u32 vers) |
542 | { |
543 | struct rpc_clnt *clnt; |
544 | struct rpc_version *version; |
545 | int err; |
546 | |
547 | BUG_ON(vers >= program->nrvers || !program->version[vers]); |
548 | version = program->version[vers]; |
549 | clnt = rpc_clone_client(old); |
550 | if (IS_ERR(clnt)) |
551 | goto out; |
552 | clnt->cl_procinfo = version->procs; |
553 | clnt->cl_maxproc = version->nrprocs; |
554 | clnt->cl_protname = program->name; |
555 | clnt->cl_prog = program->number; |
556 | clnt->cl_vers = version->number; |
557 | clnt->cl_stats = program->stats; |
558 | err = rpc_ping(clnt); |
559 | if (err != 0) { |
560 | rpc_shutdown_client(clnt); |
561 | clnt = ERR_PTR(err); |
562 | } |
563 | out: |
564 | return clnt; |
565 | } |
566 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
567 | |
568 | void rpc_task_release_client(struct rpc_task *task) |
569 | { |
570 | struct rpc_clnt *clnt = task->tk_client; |
571 | |
572 | if (clnt != NULL) { |
573 | /* Remove from client task list */ |
574 | spin_lock(&clnt->cl_lock); |
575 | list_del(&task->tk_task); |
576 | spin_unlock(&clnt->cl_lock); |
577 | task->tk_client = NULL; |
578 | |
579 | rpc_release_client(clnt); |
580 | } |
581 | } |
582 | |
583 | static |
584 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) |
585 | { |
586 | if (clnt != NULL) { |
587 | rpc_task_release_client(task); |
588 | task->tk_client = clnt; |
589 | atomic_inc(&clnt->cl_count); |
590 | if (clnt->cl_softrtry) |
591 | task->tk_flags |= RPC_TASK_SOFT; |
592 | /* Add to the client's list of all tasks */ |
593 | spin_lock(&clnt->cl_lock); |
594 | list_add_tail(&task->tk_task, &clnt->cl_tasks); |
595 | spin_unlock(&clnt->cl_lock); |
596 | } |
597 | } |
598 | |
599 | static void |
600 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) |
601 | { |
602 | if (msg != NULL) { |
603 | task->tk_msg.rpc_proc = msg->rpc_proc; |
604 | task->tk_msg.rpc_argp = msg->rpc_argp; |
605 | task->tk_msg.rpc_resp = msg->rpc_resp; |
606 | if (msg->rpc_cred != NULL) |
607 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); |
608 | } |
609 | } |
610 | |
611 | /* |
612 | * Default callback for async RPC calls |
613 | */ |
614 | static void |
615 | rpc_default_callback(struct rpc_task *task, void *data) |
616 | { |
617 | } |
618 | |
619 | static const struct rpc_call_ops rpc_default_ops = { |
620 | .rpc_call_done = rpc_default_callback, |
621 | }; |
622 | |
623 | /** |
624 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it |
625 | * @task_setup_data: pointer to task initialisation data |
626 | */ |
627 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) |
628 | { |
629 | struct rpc_task *task; |
630 | |
631 | task = rpc_new_task(task_setup_data); |
632 | if (IS_ERR(task)) |
633 | goto out; |
634 | |
635 | rpc_task_set_client(task, task_setup_data->rpc_client); |
636 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); |
637 | |
638 | if (task->tk_status != 0) { |
639 | int ret = task->tk_status; |
640 | rpc_put_task(task); |
641 | return ERR_PTR(ret); |
642 | } |
643 | |
644 | if (task->tk_action == NULL) |
645 | rpc_call_start(task); |
646 | |
647 | atomic_inc(&task->tk_count); |
648 | rpc_execute(task); |
649 | out: |
650 | return task; |
651 | } |
652 | EXPORT_SYMBOL_GPL(rpc_run_task); |
653 | |
654 | /** |
655 | * rpc_call_sync - Perform a synchronous RPC call |
656 | * @clnt: pointer to RPC client |
657 | * @msg: RPC call parameters |
658 | * @flags: RPC call flags |
659 | */ |
660 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
661 | { |
662 | struct rpc_task *task; |
663 | struct rpc_task_setup task_setup_data = { |
664 | .rpc_client = clnt, |
665 | .rpc_message = msg, |
666 | .callback_ops = &rpc_default_ops, |
667 | .flags = flags, |
668 | }; |
669 | int status; |
670 | |
671 | BUG_ON(flags & RPC_TASK_ASYNC); |
672 | |
673 | task = rpc_run_task(&task_setup_data); |
674 | if (IS_ERR(task)) |
675 | return PTR_ERR(task); |
676 | status = task->tk_status; |
677 | rpc_put_task(task); |
678 | return status; |
679 | } |
680 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
681 | |
682 | /** |
683 | * rpc_call_async - Perform an asynchronous RPC call |
684 | * @clnt: pointer to RPC client |
685 | * @msg: RPC call parameters |
686 | * @flags: RPC call flags |
687 | * @tk_ops: RPC call ops |
688 | * @data: user call data |
689 | */ |
690 | int |
691 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
692 | const struct rpc_call_ops *tk_ops, void *data) |
693 | { |
694 | struct rpc_task *task; |
695 | struct rpc_task_setup task_setup_data = { |
696 | .rpc_client = clnt, |
697 | .rpc_message = msg, |
698 | .callback_ops = tk_ops, |
699 | .callback_data = data, |
700 | .flags = flags|RPC_TASK_ASYNC, |
701 | }; |
702 | |
703 | task = rpc_run_task(&task_setup_data); |
704 | if (IS_ERR(task)) |
705 | return PTR_ERR(task); |
706 | rpc_put_task(task); |
707 | return 0; |
708 | } |
709 | EXPORT_SYMBOL_GPL(rpc_call_async); |
710 | |
711 | #if defined(CONFIG_NFS_V4_1) |
712 | /** |
713 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run |
714 | * rpc_execute against it |
715 | * @req: RPC request |
716 | * @tk_ops: RPC call ops |
717 | */ |
718 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, |
719 | const struct rpc_call_ops *tk_ops) |
720 | { |
721 | struct rpc_task *task; |
722 | struct xdr_buf *xbufp = &req->rq_snd_buf; |
723 | struct rpc_task_setup task_setup_data = { |
724 | .callback_ops = tk_ops, |
725 | }; |
726 | |
727 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); |
728 | /* |
729 | * Create an rpc_task to send the data |
730 | */ |
731 | task = rpc_new_task(&task_setup_data); |
732 | if (IS_ERR(task)) { |
733 | xprt_free_bc_request(req); |
734 | goto out; |
735 | } |
736 | task->tk_rqstp = req; |
737 | |
738 | /* |
739 | * Set up the xdr_buf length. |
740 | * This also indicates that the buffer is XDR encoded already. |
741 | */ |
742 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + |
743 | xbufp->tail[0].iov_len; |
744 | |
745 | task->tk_action = call_bc_transmit; |
746 | atomic_inc(&task->tk_count); |
747 | BUG_ON(atomic_read(&task->tk_count) != 2); |
748 | rpc_execute(task); |
749 | |
750 | out: |
751 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); |
752 | return task; |
753 | } |
754 | #endif /* CONFIG_NFS_V4_1 */ |
755 | |
756 | void |
757 | rpc_call_start(struct rpc_task *task) |
758 | { |
759 | task->tk_action = call_start; |
760 | } |
761 | EXPORT_SYMBOL_GPL(rpc_call_start); |
762 | |
763 | /** |
764 | * rpc_peeraddr - extract remote peer address from clnt's xprt |
765 | * @clnt: RPC client structure |
766 | * @buf: target buffer |
767 | * @bufsize: length of target buffer |
768 | * |
769 | * Returns the number of bytes that are actually in the stored address. |
770 | */ |
771 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) |
772 | { |
773 | size_t bytes; |
774 | struct rpc_xprt *xprt = clnt->cl_xprt; |
775 | |
776 | bytes = sizeof(xprt->addr); |
777 | if (bytes > bufsize) |
778 | bytes = bufsize; |
779 | memcpy(buf, &clnt->cl_xprt->addr, bytes); |
780 | return xprt->addrlen; |
781 | } |
782 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
783 | |
784 | /** |
785 | * rpc_peeraddr2str - return remote peer address in printable format |
786 | * @clnt: RPC client structure |
787 | * @format: address format |
788 | * |
789 | */ |
790 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
791 | enum rpc_display_format_t format) |
792 | { |
793 | struct rpc_xprt *xprt = clnt->cl_xprt; |
794 | |
795 | if (xprt->address_strings[format] != NULL) |
796 | return xprt->address_strings[format]; |
797 | else |
798 | return "unprintable"; |
799 | } |
800 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
801 | |
802 | void |
803 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) |
804 | { |
805 | struct rpc_xprt *xprt = clnt->cl_xprt; |
806 | if (xprt->ops->set_buffer_size) |
807 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); |
808 | } |
809 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
810 | |
811 | /* |
812 | * Return size of largest payload RPC client can support, in bytes |
813 | * |
814 | * For stream transports, this is one RPC record fragment (see RFC |
815 | * 1831), as we don't support multi-record requests yet. For datagram |
816 | * transports, this is the size of an IP packet minus the IP, UDP, and |
817 | * RPC header sizes. |
818 | */ |
819 | size_t rpc_max_payload(struct rpc_clnt *clnt) |
820 | { |
821 | return clnt->cl_xprt->max_payload; |
822 | } |
823 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
824 | |
825 | /** |
826 | * rpc_force_rebind - force transport to check that remote port is unchanged |
827 | * @clnt: client to rebind |
828 | * |
829 | */ |
830 | void rpc_force_rebind(struct rpc_clnt *clnt) |
831 | { |
832 | if (clnt->cl_autobind) |
833 | xprt_clear_bound(clnt->cl_xprt); |
834 | } |
835 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
836 | |
837 | /* |
838 | * Restart an (async) RPC call from the call_prepare state. |
839 | * Usually called from within the exit handler. |
840 | */ |
841 | int |
842 | rpc_restart_call_prepare(struct rpc_task *task) |
843 | { |
844 | if (RPC_ASSASSINATED(task)) |
845 | return 0; |
846 | task->tk_action = rpc_prepare_task; |
847 | return 1; |
848 | } |
849 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); |
850 | |
851 | /* |
852 | * Restart an (async) RPC call. Usually called from within the |
853 | * exit handler. |
854 | */ |
855 | int |
856 | rpc_restart_call(struct rpc_task *task) |
857 | { |
858 | if (RPC_ASSASSINATED(task)) |
859 | return 0; |
860 | task->tk_action = call_start; |
861 | return 1; |
862 | } |
863 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
864 | |
865 | #ifdef RPC_DEBUG |
866 | static const char *rpc_proc_name(const struct rpc_task *task) |
867 | { |
868 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
869 | |
870 | if (proc) { |
871 | if (proc->p_name) |
872 | return proc->p_name; |
873 | else |
874 | return "NULL"; |
875 | } else |
876 | return "no proc"; |
877 | } |
878 | #endif |
879 | |
880 | /* |
881 | * 0. Initial state |
882 | * |
883 | * Other FSM states can be visited zero or more times, but |
884 | * this state is visited exactly once for each RPC. |
885 | */ |
886 | static void |
887 | call_start(struct rpc_task *task) |
888 | { |
889 | struct rpc_clnt *clnt = task->tk_client; |
890 | |
891 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
892 | clnt->cl_protname, clnt->cl_vers, |
893 | rpc_proc_name(task), |
894 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
895 | |
896 | /* Increment call count */ |
897 | task->tk_msg.rpc_proc->p_count++; |
898 | clnt->cl_stats->rpccnt++; |
899 | task->tk_action = call_reserve; |
900 | } |
901 | |
902 | /* |
903 | * 1. Reserve an RPC call slot |
904 | */ |
905 | static void |
906 | call_reserve(struct rpc_task *task) |
907 | { |
908 | dprint_status(task); |
909 | |
910 | task->tk_status = 0; |
911 | task->tk_action = call_reserveresult; |
912 | xprt_reserve(task); |
913 | } |
914 | |
915 | /* |
916 | * 1b. Grok the result of xprt_reserve() |
917 | */ |
918 | static void |
919 | call_reserveresult(struct rpc_task *task) |
920 | { |
921 | int status = task->tk_status; |
922 | |
923 | dprint_status(task); |
924 | |
925 | /* |
926 | * After a call to xprt_reserve(), we must have either |
927 | * a request slot or else an error status. |
928 | */ |
929 | task->tk_status = 0; |
930 | if (status >= 0) { |
931 | if (task->tk_rqstp) { |
932 | task->tk_action = call_refresh; |
933 | return; |
934 | } |
935 | |
936 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", |
937 | __func__, status); |
938 | rpc_exit(task, -EIO); |
939 | return; |
940 | } |
941 | |
942 | /* |
943 | * Even though there was an error, we may have acquired |
944 | * a request slot somehow. Make sure not to leak it. |
945 | */ |
946 | if (task->tk_rqstp) { |
947 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", |
948 | __func__, status); |
949 | xprt_release(task); |
950 | } |
951 | |
952 | switch (status) { |
953 | case -EAGAIN: /* woken up; retry */ |
954 | task->tk_action = call_reserve; |
955 | return; |
956 | case -EIO: /* probably a shutdown */ |
957 | break; |
958 | default: |
959 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", |
960 | __func__, status); |
961 | break; |
962 | } |
963 | rpc_exit(task, status); |
964 | } |
965 | |
966 | /* |
967 | * 2. Bind and/or refresh the credentials |
968 | */ |
969 | static void |
970 | call_refresh(struct rpc_task *task) |
971 | { |
972 | dprint_status(task); |
973 | |
974 | task->tk_action = call_refreshresult; |
975 | task->tk_status = 0; |
976 | task->tk_client->cl_stats->rpcauthrefresh++; |
977 | rpcauth_refreshcred(task); |
978 | } |
979 | |
980 | /* |
981 | * 2a. Process the results of a credential refresh |
982 | */ |
983 | static void |
984 | call_refreshresult(struct rpc_task *task) |
985 | { |
986 | int status = task->tk_status; |
987 | |
988 | dprint_status(task); |
989 | |
990 | task->tk_status = 0; |
991 | task->tk_action = call_allocate; |
992 | if (status >= 0 && rpcauth_uptodatecred(task)) |
993 | return; |
994 | switch (status) { |
995 | case -EACCES: |
996 | rpc_exit(task, -EACCES); |
997 | return; |
998 | case -ENOMEM: |
999 | rpc_exit(task, -ENOMEM); |
1000 | return; |
1001 | case -ETIMEDOUT: |
1002 | rpc_delay(task, 3*HZ); |
1003 | } |
1004 | task->tk_action = call_refresh; |
1005 | } |
1006 | |
1007 | /* |
1008 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. |
1009 | * (Note: buffer memory is freed in xprt_release). |
1010 | */ |
1011 | static void |
1012 | call_allocate(struct rpc_task *task) |
1013 | { |
1014 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
1015 | struct rpc_rqst *req = task->tk_rqstp; |
1016 | struct rpc_xprt *xprt = task->tk_xprt; |
1017 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1018 | |
1019 | dprint_status(task); |
1020 | |
1021 | task->tk_status = 0; |
1022 | task->tk_action = call_bind; |
1023 | |
1024 | if (req->rq_buffer) |
1025 | return; |
1026 | |
1027 | if (proc->p_proc != 0) { |
1028 | BUG_ON(proc->p_arglen == 0); |
1029 | if (proc->p_decode != NULL) |
1030 | BUG_ON(proc->p_replen == 0); |
1031 | } |
1032 | |
1033 | /* |
1034 | * Calculate the size (in quads) of the RPC call |
1035 | * and reply headers, and convert both values |
1036 | * to byte sizes. |
1037 | */ |
1038 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; |
1039 | req->rq_callsize <<= 2; |
1040 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; |
1041 | req->rq_rcvsize <<= 2; |
1042 | |
1043 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1044 | req->rq_callsize + req->rq_rcvsize); |
1045 | if (req->rq_buffer != NULL) |
1046 | return; |
1047 | |
1048 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); |
1049 | |
1050 | if (RPC_IS_ASYNC(task) || !signalled()) { |
1051 | task->tk_action = call_allocate; |
1052 | rpc_delay(task, HZ>>4); |
1053 | return; |
1054 | } |
1055 | |
1056 | rpc_exit(task, -ERESTARTSYS); |
1057 | } |
1058 | |
1059 | static inline int |
1060 | rpc_task_need_encode(struct rpc_task *task) |
1061 | { |
1062 | return task->tk_rqstp->rq_snd_buf.len == 0; |
1063 | } |
1064 | |
1065 | static inline void |
1066 | rpc_task_force_reencode(struct rpc_task *task) |
1067 | { |
1068 | task->tk_rqstp->rq_snd_buf.len = 0; |
1069 | task->tk_rqstp->rq_bytes_sent = 0; |
1070 | } |
1071 | |
1072 | static inline void |
1073 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) |
1074 | { |
1075 | buf->head[0].iov_base = start; |
1076 | buf->head[0].iov_len = len; |
1077 | buf->tail[0].iov_len = 0; |
1078 | buf->page_len = 0; |
1079 | buf->flags = 0; |
1080 | buf->len = 0; |
1081 | buf->buflen = len; |
1082 | } |
1083 | |
1084 | /* |
1085 | * 3. Encode arguments of an RPC call |
1086 | */ |
1087 | static void |
1088 | rpc_xdr_encode(struct rpc_task *task) |
1089 | { |
1090 | struct rpc_rqst *req = task->tk_rqstp; |
1091 | kxdrproc_t encode; |
1092 | __be32 *p; |
1093 | |
1094 | dprint_status(task); |
1095 | |
1096 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1097 | req->rq_buffer, |
1098 | req->rq_callsize); |
1099 | rpc_xdr_buf_init(&req->rq_rcv_buf, |
1100 | (char *)req->rq_buffer + req->rq_callsize, |
1101 | req->rq_rcvsize); |
1102 | |
1103 | p = rpc_encode_header(task); |
1104 | if (p == NULL) { |
1105 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); |
1106 | rpc_exit(task, -EIO); |
1107 | return; |
1108 | } |
1109 | |
1110 | encode = task->tk_msg.rpc_proc->p_encode; |
1111 | if (encode == NULL) |
1112 | return; |
1113 | |
1114 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, |
1115 | task->tk_msg.rpc_argp); |
1116 | } |
1117 | |
1118 | /* |
1119 | * 4. Get the server port number if not yet set |
1120 | */ |
1121 | static void |
1122 | call_bind(struct rpc_task *task) |
1123 | { |
1124 | struct rpc_xprt *xprt = task->tk_xprt; |
1125 | |
1126 | dprint_status(task); |
1127 | |
1128 | task->tk_action = call_connect; |
1129 | if (!xprt_bound(xprt)) { |
1130 | task->tk_action = call_bind_status; |
1131 | task->tk_timeout = xprt->bind_timeout; |
1132 | xprt->ops->rpcbind(task); |
1133 | } |
1134 | } |
1135 | |
1136 | /* |
1137 | * 4a. Sort out bind result |
1138 | */ |
1139 | static void |
1140 | call_bind_status(struct rpc_task *task) |
1141 | { |
1142 | int status = -EIO; |
1143 | |
1144 | if (task->tk_status >= 0) { |
1145 | dprint_status(task); |
1146 | task->tk_status = 0; |
1147 | task->tk_action = call_connect; |
1148 | return; |
1149 | } |
1150 | |
1151 | switch (task->tk_status) { |
1152 | case -ENOMEM: |
1153 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); |
1154 | rpc_delay(task, HZ >> 2); |
1155 | goto retry_timeout; |
1156 | case -EACCES: |
1157 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1158 | "unavailable\n", task->tk_pid); |
1159 | /* fail immediately if this is an RPC ping */ |
1160 | if (task->tk_msg.rpc_proc->p_proc == 0) { |
1161 | status = -EOPNOTSUPP; |
1162 | break; |
1163 | } |
1164 | rpc_delay(task, 3*HZ); |
1165 | goto retry_timeout; |
1166 | case -ETIMEDOUT: |
1167 | dprintk("RPC: %5u rpcbind request timed out\n", |
1168 | task->tk_pid); |
1169 | goto retry_timeout; |
1170 | case -EPFNOSUPPORT: |
1171 | /* server doesn't support any rpcbind version we know of */ |
1172 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
1173 | task->tk_pid); |
1174 | break; |
1175 | case -EPROTONOSUPPORT: |
1176 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
1177 | task->tk_pid); |
1178 | task->tk_status = 0; |
1179 | task->tk_action = call_bind; |
1180 | return; |
1181 | case -ECONNREFUSED: /* connection problems */ |
1182 | case -ECONNRESET: |
1183 | case -ENOTCONN: |
1184 | case -EHOSTDOWN: |
1185 | case -EHOSTUNREACH: |
1186 | case -ENETUNREACH: |
1187 | case -EPIPE: |
1188 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", |
1189 | task->tk_pid, task->tk_status); |
1190 | if (!RPC_IS_SOFTCONN(task)) { |
1191 | rpc_delay(task, 5*HZ); |
1192 | goto retry_timeout; |
1193 | } |
1194 | status = task->tk_status; |
1195 | break; |
1196 | default: |
1197 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
1198 | task->tk_pid, -task->tk_status); |
1199 | } |
1200 | |
1201 | rpc_exit(task, status); |
1202 | return; |
1203 | |
1204 | retry_timeout: |
1205 | task->tk_action = call_timeout; |
1206 | } |
1207 | |
1208 | /* |
1209 | * 4b. Connect to the RPC server |
1210 | */ |
1211 | static void |
1212 | call_connect(struct rpc_task *task) |
1213 | { |
1214 | struct rpc_xprt *xprt = task->tk_xprt; |
1215 | |
1216 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
1217 | task->tk_pid, xprt, |
1218 | (xprt_connected(xprt) ? "is" : "is not")); |
1219 | |
1220 | task->tk_action = call_transmit; |
1221 | if (!xprt_connected(xprt)) { |
1222 | task->tk_action = call_connect_status; |
1223 | if (task->tk_status < 0) |
1224 | return; |
1225 | xprt_connect(task); |
1226 | } |
1227 | } |
1228 | |
1229 | /* |
1230 | * 4c. Sort out connect result |
1231 | */ |
1232 | static void |
1233 | call_connect_status(struct rpc_task *task) |
1234 | { |
1235 | struct rpc_clnt *clnt = task->tk_client; |
1236 | int status = task->tk_status; |
1237 | |
1238 | dprint_status(task); |
1239 | |
1240 | task->tk_status = 0; |
1241 | if (status >= 0 || status == -EAGAIN) { |
1242 | clnt->cl_stats->netreconn++; |
1243 | task->tk_action = call_transmit; |
1244 | return; |
1245 | } |
1246 | |
1247 | switch (status) { |
1248 | /* if soft mounted, test if we've timed out */ |
1249 | case -ETIMEDOUT: |
1250 | task->tk_action = call_timeout; |
1251 | break; |
1252 | default: |
1253 | rpc_exit(task, -EIO); |
1254 | } |
1255 | } |
1256 | |
1257 | /* |
1258 | * 5. Transmit the RPC request, and wait for reply |
1259 | */ |
1260 | static void |
1261 | call_transmit(struct rpc_task *task) |
1262 | { |
1263 | dprint_status(task); |
1264 | |
1265 | task->tk_action = call_status; |
1266 | if (task->tk_status < 0) |
1267 | return; |
1268 | task->tk_status = xprt_prepare_transmit(task); |
1269 | if (task->tk_status != 0) |
1270 | return; |
1271 | task->tk_action = call_transmit_status; |
1272 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
1273 | if (rpc_task_need_encode(task)) { |
1274 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
1275 | rpc_xdr_encode(task); |
1276 | /* Did the encode result in an error condition? */ |
1277 | if (task->tk_status != 0) { |
1278 | /* Was the error nonfatal? */ |
1279 | if (task->tk_status == -EAGAIN) |
1280 | rpc_delay(task, HZ >> 4); |
1281 | else |
1282 | rpc_exit(task, task->tk_status); |
1283 | return; |
1284 | } |
1285 | } |
1286 | xprt_transmit(task); |
1287 | if (task->tk_status < 0) |
1288 | return; |
1289 | /* |
1290 | * On success, ensure that we call xprt_end_transmit() before sleeping |
1291 | * in order to allow access to the socket to other RPC requests. |
1292 | */ |
1293 | call_transmit_status(task); |
1294 | if (rpc_reply_expected(task)) |
1295 | return; |
1296 | task->tk_action = rpc_exit_task; |
1297 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
1298 | } |
1299 | |
1300 | /* |
1301 | * 5a. Handle cleanup after a transmission |
1302 | */ |
1303 | static void |
1304 | call_transmit_status(struct rpc_task *task) |
1305 | { |
1306 | task->tk_action = call_status; |
1307 | |
1308 | /* |
1309 | * Common case: success. Force the compiler to put this |
1310 | * test first. |
1311 | */ |
1312 | if (task->tk_status == 0) { |
1313 | xprt_end_transmit(task); |
1314 | rpc_task_force_reencode(task); |
1315 | return; |
1316 | } |
1317 | |
1318 | switch (task->tk_status) { |
1319 | case -EAGAIN: |
1320 | break; |
1321 | default: |
1322 | dprint_status(task); |
1323 | xprt_end_transmit(task); |
1324 | rpc_task_force_reencode(task); |
1325 | break; |
1326 | /* |
1327 | * Special cases: if we've been waiting on the |
1328 | * socket's write_space() callback, or if the |
1329 | * socket just returned a connection error, |
1330 | * then hold onto the transport lock. |
1331 | */ |
1332 | case -ECONNREFUSED: |
1333 | case -EHOSTDOWN: |
1334 | case -EHOSTUNREACH: |
1335 | case -ENETUNREACH: |
1336 | if (RPC_IS_SOFTCONN(task)) { |
1337 | xprt_end_transmit(task); |
1338 | rpc_exit(task, task->tk_status); |
1339 | break; |
1340 | } |
1341 | case -ECONNRESET: |
1342 | case -ENOTCONN: |
1343 | case -EPIPE: |
1344 | rpc_task_force_reencode(task); |
1345 | } |
1346 | } |
1347 | |
1348 | #if defined(CONFIG_NFS_V4_1) |
1349 | /* |
1350 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In |
1351 | * addition, disconnect on connectivity errors. |
1352 | */ |
1353 | static void |
1354 | call_bc_transmit(struct rpc_task *task) |
1355 | { |
1356 | struct rpc_rqst *req = task->tk_rqstp; |
1357 | |
1358 | BUG_ON(task->tk_status != 0); |
1359 | task->tk_status = xprt_prepare_transmit(task); |
1360 | if (task->tk_status == -EAGAIN) { |
1361 | /* |
1362 | * Could not reserve the transport. Try again after the |
1363 | * transport is released. |
1364 | */ |
1365 | task->tk_status = 0; |
1366 | task->tk_action = call_bc_transmit; |
1367 | return; |
1368 | } |
1369 | |
1370 | task->tk_action = rpc_exit_task; |
1371 | if (task->tk_status < 0) { |
1372 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1373 | "error: %d\n", task->tk_status); |
1374 | return; |
1375 | } |
1376 | |
1377 | xprt_transmit(task); |
1378 | xprt_end_transmit(task); |
1379 | dprint_status(task); |
1380 | switch (task->tk_status) { |
1381 | case 0: |
1382 | /* Success */ |
1383 | break; |
1384 | case -EHOSTDOWN: |
1385 | case -EHOSTUNREACH: |
1386 | case -ENETUNREACH: |
1387 | case -ETIMEDOUT: |
1388 | /* |
1389 | * Problem reaching the server. Disconnect and let the |
1390 | * forechannel reestablish the connection. The server will |
1391 | * have to retransmit the backchannel request and we'll |
1392 | * reprocess it. Since these ops are idempotent, there's no |
1393 | * need to cache our reply at this time. |
1394 | */ |
1395 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1396 | "error: %d\n", task->tk_status); |
1397 | xprt_conditional_disconnect(task->tk_xprt, |
1398 | req->rq_connect_cookie); |
1399 | break; |
1400 | default: |
1401 | /* |
1402 | * We were unable to reply and will have to drop the |
1403 | * request. The server should reconnect and retransmit. |
1404 | */ |
1405 | BUG_ON(task->tk_status == -EAGAIN); |
1406 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1407 | "error: %d\n", task->tk_status); |
1408 | break; |
1409 | } |
1410 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); |
1411 | } |
1412 | #endif /* CONFIG_NFS_V4_1 */ |
1413 | |
1414 | /* |
1415 | * 6. Sort out the RPC call status |
1416 | */ |
1417 | static void |
1418 | call_status(struct rpc_task *task) |
1419 | { |
1420 | struct rpc_clnt *clnt = task->tk_client; |
1421 | struct rpc_rqst *req = task->tk_rqstp; |
1422 | int status; |
1423 | |
1424 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1425 | task->tk_status = req->rq_reply_bytes_recvd; |
1426 | |
1427 | dprint_status(task); |
1428 | |
1429 | status = task->tk_status; |
1430 | if (status >= 0) { |
1431 | task->tk_action = call_decode; |
1432 | return; |
1433 | } |
1434 | |
1435 | task->tk_status = 0; |
1436 | switch(status) { |
1437 | case -EHOSTDOWN: |
1438 | case -EHOSTUNREACH: |
1439 | case -ENETUNREACH: |
1440 | /* |
1441 | * Delay any retries for 3 seconds, then handle as if it |
1442 | * were a timeout. |
1443 | */ |
1444 | rpc_delay(task, 3*HZ); |
1445 | case -ETIMEDOUT: |
1446 | task->tk_action = call_timeout; |
1447 | if (task->tk_client->cl_discrtry) |
1448 | xprt_conditional_disconnect(task->tk_xprt, |
1449 | req->rq_connect_cookie); |
1450 | break; |
1451 | case -ECONNRESET: |
1452 | case -ECONNREFUSED: |
1453 | rpc_force_rebind(clnt); |
1454 | rpc_delay(task, 3*HZ); |
1455 | case -EPIPE: |
1456 | case -ENOTCONN: |
1457 | task->tk_action = call_bind; |
1458 | break; |
1459 | case -EAGAIN: |
1460 | task->tk_action = call_transmit; |
1461 | break; |
1462 | case -EIO: |
1463 | /* shutdown or soft timeout */ |
1464 | rpc_exit(task, status); |
1465 | break; |
1466 | default: |
1467 | if (clnt->cl_chatty) |
1468 | printk("%s: RPC call returned error %d\n", |
1469 | clnt->cl_protname, -status); |
1470 | rpc_exit(task, status); |
1471 | } |
1472 | } |
1473 | |
1474 | /* |
1475 | * 6a. Handle RPC timeout |
1476 | * We do not release the request slot, so we keep using the |
1477 | * same XID for all retransmits. |
1478 | */ |
1479 | static void |
1480 | call_timeout(struct rpc_task *task) |
1481 | { |
1482 | struct rpc_clnt *clnt = task->tk_client; |
1483 | |
1484 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { |
1485 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1486 | goto retry; |
1487 | } |
1488 | |
1489 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
1490 | task->tk_timeouts++; |
1491 | |
1492 | if (RPC_IS_SOFTCONN(task)) { |
1493 | rpc_exit(task, -ETIMEDOUT); |
1494 | return; |
1495 | } |
1496 | if (RPC_IS_SOFT(task)) { |
1497 | if (clnt->cl_chatty) |
1498 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1499 | clnt->cl_protname, clnt->cl_server); |
1500 | rpc_exit(task, -EIO); |
1501 | return; |
1502 | } |
1503 | |
1504 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1505 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1506 | if (clnt->cl_chatty) |
1507 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
1508 | clnt->cl_protname, clnt->cl_server); |
1509 | } |
1510 | rpc_force_rebind(clnt); |
1511 | /* |
1512 | * Did our request time out due to an RPCSEC_GSS out-of-sequence |
1513 | * event? RFC2203 requires the server to drop all such requests. |
1514 | */ |
1515 | rpcauth_invalcred(task); |
1516 | |
1517 | retry: |
1518 | clnt->cl_stats->rpcretrans++; |
1519 | task->tk_action = call_bind; |
1520 | task->tk_status = 0; |
1521 | } |
1522 | |
1523 | /* |
1524 | * 7. Decode the RPC reply |
1525 | */ |
1526 | static void |
1527 | call_decode(struct rpc_task *task) |
1528 | { |
1529 | struct rpc_clnt *clnt = task->tk_client; |
1530 | struct rpc_rqst *req = task->tk_rqstp; |
1531 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; |
1532 | __be32 *p; |
1533 | |
1534 | dprintk("RPC: %5u call_decode (status %d)\n", |
1535 | task->tk_pid, task->tk_status); |
1536 | |
1537 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1538 | if (clnt->cl_chatty) |
1539 | printk(KERN_NOTICE "%s: server %s OK\n", |
1540 | clnt->cl_protname, clnt->cl_server); |
1541 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1542 | } |
1543 | |
1544 | /* |
1545 | * Ensure that we see all writes made by xprt_complete_rqst() |
1546 | * before it changed req->rq_reply_bytes_recvd. |
1547 | */ |
1548 | smp_rmb(); |
1549 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1550 | |
1551 | /* Check that the softirq receive buffer is valid */ |
1552 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, |
1553 | sizeof(req->rq_rcv_buf)) != 0); |
1554 | |
1555 | if (req->rq_rcv_buf.len < 12) { |
1556 | if (!RPC_IS_SOFT(task)) { |
1557 | task->tk_action = call_bind; |
1558 | clnt->cl_stats->rpcretrans++; |
1559 | goto out_retry; |
1560 | } |
1561 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
1562 | clnt->cl_protname, task->tk_status); |
1563 | task->tk_action = call_timeout; |
1564 | goto out_retry; |
1565 | } |
1566 | |
1567 | p = rpc_verify_header(task); |
1568 | if (IS_ERR(p)) { |
1569 | if (p == ERR_PTR(-EAGAIN)) |
1570 | goto out_retry; |
1571 | return; |
1572 | } |
1573 | |
1574 | task->tk_action = rpc_exit_task; |
1575 | |
1576 | if (decode) { |
1577 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1578 | task->tk_msg.rpc_resp); |
1579 | } |
1580 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1581 | task->tk_status); |
1582 | return; |
1583 | out_retry: |
1584 | task->tk_status = 0; |
1585 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
1586 | if (task->tk_rqstp == req) { |
1587 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
1588 | if (task->tk_client->cl_discrtry) |
1589 | xprt_conditional_disconnect(task->tk_xprt, |
1590 | req->rq_connect_cookie); |
1591 | } |
1592 | } |
1593 | |
1594 | static __be32 * |
1595 | rpc_encode_header(struct rpc_task *task) |
1596 | { |
1597 | struct rpc_clnt *clnt = task->tk_client; |
1598 | struct rpc_rqst *req = task->tk_rqstp; |
1599 | __be32 *p = req->rq_svec[0].iov_base; |
1600 | |
1601 | /* FIXME: check buffer size? */ |
1602 | |
1603 | p = xprt_skip_transport_header(task->tk_xprt, p); |
1604 | *p++ = req->rq_xid; /* XID */ |
1605 | *p++ = htonl(RPC_CALL); /* CALL */ |
1606 | *p++ = htonl(RPC_VERSION); /* RPC version */ |
1607 | *p++ = htonl(clnt->cl_prog); /* program number */ |
1608 | *p++ = htonl(clnt->cl_vers); /* program version */ |
1609 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ |
1610 | p = rpcauth_marshcred(task, p); |
1611 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); |
1612 | return p; |
1613 | } |
1614 | |
1615 | static __be32 * |
1616 | rpc_verify_header(struct rpc_task *task) |
1617 | { |
1618 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
1619 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; |
1620 | __be32 *p = iov->iov_base; |
1621 | u32 n; |
1622 | int error = -EACCES; |
1623 | |
1624 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1625 | /* RFC-1014 says that the representation of XDR data must be a |
1626 | * multiple of four bytes |
1627 | * - if it isn't pointer subtraction in the NFS client may give |
1628 | * undefined results |
1629 | */ |
1630 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
1631 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
1632 | task->tk_rqstp->rq_rcv_buf.len); |
1633 | goto out_eio; |
1634 | } |
1635 | if ((len -= 3) < 0) |
1636 | goto out_overflow; |
1637 | |
1638 | p += 1; /* skip XID */ |
1639 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
1640 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
1641 | task->tk_pid, __func__, n); |
1642 | goto out_garbage; |
1643 | } |
1644 | |
1645 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
1646 | if (--len < 0) |
1647 | goto out_overflow; |
1648 | switch ((n = ntohl(*p++))) { |
1649 | case RPC_AUTH_ERROR: |
1650 | break; |
1651 | case RPC_MISMATCH: |
1652 | dprintk("RPC: %5u %s: RPC call version " |
1653 | "mismatch!\n", |
1654 | task->tk_pid, __func__); |
1655 | error = -EPROTONOSUPPORT; |
1656 | goto out_err; |
1657 | default: |
1658 | dprintk("RPC: %5u %s: RPC call rejected, " |
1659 | "unknown error: %x\n", |
1660 | task->tk_pid, __func__, n); |
1661 | goto out_eio; |
1662 | } |
1663 | if (--len < 0) |
1664 | goto out_overflow; |
1665 | switch ((n = ntohl(*p++))) { |
1666 | case RPC_AUTH_REJECTEDCRED: |
1667 | case RPC_AUTH_REJECTEDVERF: |
1668 | case RPCSEC_GSS_CREDPROBLEM: |
1669 | case RPCSEC_GSS_CTXPROBLEM: |
1670 | if (!task->tk_cred_retry) |
1671 | break; |
1672 | task->tk_cred_retry--; |
1673 | dprintk("RPC: %5u %s: retry stale creds\n", |
1674 | task->tk_pid, __func__); |
1675 | rpcauth_invalcred(task); |
1676 | /* Ensure we obtain a new XID! */ |
1677 | xprt_release(task); |
1678 | task->tk_action = call_refresh; |
1679 | goto out_retry; |
1680 | case RPC_AUTH_BADCRED: |
1681 | case RPC_AUTH_BADVERF: |
1682 | /* possibly garbled cred/verf? */ |
1683 | if (!task->tk_garb_retry) |
1684 | break; |
1685 | task->tk_garb_retry--; |
1686 | dprintk("RPC: %5u %s: retry garbled creds\n", |
1687 | task->tk_pid, __func__); |
1688 | task->tk_action = call_bind; |
1689 | goto out_retry; |
1690 | case RPC_AUTH_TOOWEAK: |
1691 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
1692 | "authentication.\n", task->tk_client->cl_server); |
1693 | break; |
1694 | default: |
1695 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
1696 | task->tk_pid, __func__, n); |
1697 | error = -EIO; |
1698 | } |
1699 | dprintk("RPC: %5u %s: call rejected %d\n", |
1700 | task->tk_pid, __func__, n); |
1701 | goto out_err; |
1702 | } |
1703 | if (!(p = rpcauth_checkverf(task, p))) { |
1704 | dprintk("RPC: %5u %s: auth check failed\n", |
1705 | task->tk_pid, __func__); |
1706 | goto out_garbage; /* bad verifier, retry */ |
1707 | } |
1708 | len = p - (__be32 *)iov->iov_base - 1; |
1709 | if (len < 0) |
1710 | goto out_overflow; |
1711 | switch ((n = ntohl(*p++))) { |
1712 | case RPC_SUCCESS: |
1713 | return p; |
1714 | case RPC_PROG_UNAVAIL: |
1715 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
1716 | task->tk_pid, __func__, |
1717 | (unsigned int)task->tk_client->cl_prog, |
1718 | task->tk_client->cl_server); |
1719 | error = -EPFNOSUPPORT; |
1720 | goto out_err; |
1721 | case RPC_PROG_MISMATCH: |
1722 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
1723 | "server %s\n", task->tk_pid, __func__, |
1724 | (unsigned int)task->tk_client->cl_prog, |
1725 | (unsigned int)task->tk_client->cl_vers, |
1726 | task->tk_client->cl_server); |
1727 | error = -EPROTONOSUPPORT; |
1728 | goto out_err; |
1729 | case RPC_PROC_UNAVAIL: |
1730 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
1731 | "version %u on server %s\n", |
1732 | task->tk_pid, __func__, |
1733 | rpc_proc_name(task), |
1734 | task->tk_client->cl_prog, |
1735 | task->tk_client->cl_vers, |
1736 | task->tk_client->cl_server); |
1737 | error = -EOPNOTSUPP; |
1738 | goto out_err; |
1739 | case RPC_GARBAGE_ARGS: |
1740 | dprintk("RPC: %5u %s: server saw garbage\n", |
1741 | task->tk_pid, __func__); |
1742 | break; /* retry */ |
1743 | default: |
1744 | dprintk("RPC: %5u %s: server accept status: %x\n", |
1745 | task->tk_pid, __func__, n); |
1746 | /* Also retry */ |
1747 | } |
1748 | |
1749 | out_garbage: |
1750 | task->tk_client->cl_stats->rpcgarbage++; |
1751 | if (task->tk_garb_retry) { |
1752 | task->tk_garb_retry--; |
1753 | dprintk("RPC: %5u %s: retrying\n", |
1754 | task->tk_pid, __func__); |
1755 | task->tk_action = call_bind; |
1756 | out_retry: |
1757 | return ERR_PTR(-EAGAIN); |
1758 | } |
1759 | out_eio: |
1760 | error = -EIO; |
1761 | out_err: |
1762 | rpc_exit(task, error); |
1763 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
1764 | __func__, error); |
1765 | return ERR_PTR(error); |
1766 | out_overflow: |
1767 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
1768 | __func__); |
1769 | goto out_garbage; |
1770 | } |
1771 | |
1772 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
1773 | { |
1774 | return 0; |
1775 | } |
1776 | |
1777 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
1778 | { |
1779 | return 0; |
1780 | } |
1781 | |
1782 | static struct rpc_procinfo rpcproc_null = { |
1783 | .p_encode = rpcproc_encode_null, |
1784 | .p_decode = rpcproc_decode_null, |
1785 | }; |
1786 | |
1787 | static int rpc_ping(struct rpc_clnt *clnt) |
1788 | { |
1789 | struct rpc_message msg = { |
1790 | .rpc_proc = &rpcproc_null, |
1791 | }; |
1792 | int err; |
1793 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); |
1794 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
1795 | put_rpccred(msg.rpc_cred); |
1796 | return err; |
1797 | } |
1798 | |
1799 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1800 | { |
1801 | struct rpc_message msg = { |
1802 | .rpc_proc = &rpcproc_null, |
1803 | .rpc_cred = cred, |
1804 | }; |
1805 | struct rpc_task_setup task_setup_data = { |
1806 | .rpc_client = clnt, |
1807 | .rpc_message = &msg, |
1808 | .callback_ops = &rpc_default_ops, |
1809 | .flags = flags, |
1810 | }; |
1811 | return rpc_run_task(&task_setup_data); |
1812 | } |
1813 | EXPORT_SYMBOL_GPL(rpc_call_null); |
1814 | |
1815 | #ifdef RPC_DEBUG |
1816 | static void rpc_show_header(void) |
1817 | { |
1818 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
1819 | "-timeout ---ops--\n"); |
1820 | } |
1821 | |
1822 | static void rpc_show_task(const struct rpc_clnt *clnt, |
1823 | const struct rpc_task *task) |
1824 | { |
1825 | const char *rpc_waitq = "none"; |
1826 | char *p, action[KSYM_SYMBOL_LEN]; |
1827 | |
1828 | if (RPC_IS_QUEUED(task)) |
1829 | rpc_waitq = rpc_qname(task->tk_waitqueue); |
1830 | |
1831 | /* map tk_action pointer to a function name; then trim off |
1832 | * the "+0x0 [sunrpc]" */ |
1833 | sprint_symbol(action, (unsigned long)task->tk_action); |
1834 | p = strchr(action, '+'); |
1835 | if (p) |
1836 | *p = '\0'; |
1837 | |
1838 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n", |
1839 | task->tk_pid, task->tk_flags, task->tk_status, |
1840 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, |
1841 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), |
1842 | action, rpc_waitq); |
1843 | } |
1844 | |
1845 | void rpc_show_tasks(void) |
1846 | { |
1847 | struct rpc_clnt *clnt; |
1848 | struct rpc_task *task; |
1849 | int header = 0; |
1850 | |
1851 | spin_lock(&rpc_client_lock); |
1852 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
1853 | spin_lock(&clnt->cl_lock); |
1854 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
1855 | if (!header) { |
1856 | rpc_show_header(); |
1857 | header++; |
1858 | } |
1859 | rpc_show_task(clnt, task); |
1860 | } |
1861 | spin_unlock(&clnt->cl_lock); |
1862 | } |
1863 | spin_unlock(&rpc_client_lock); |
1864 | } |
1865 | #endif |
1866 |
Branches:
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9