Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
55aa4f58 | 2 | * linux/net/sunrpc/clnt.c |
1da177e4 LT |
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/mm.h> | |
29 | #include <linux/slab.h> | |
1da177e4 | 30 | #include <linux/utsname.h> |
11c556b3 | 31 | #include <linux/workqueue.h> |
1da177e4 LT |
32 | |
33 | #include <linux/sunrpc/clnt.h> | |
1da177e4 | 34 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 35 | #include <linux/sunrpc/metrics.h> |
1da177e4 LT |
36 | |
37 | ||
38 | #define RPC_SLACK_SPACE (1024) /* total overkill */ | |
39 | ||
40 | #ifdef RPC_DEBUG | |
41 | # define RPCDBG_FACILITY RPCDBG_CALL | |
42 | #endif | |
43 | ||
44 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); | |
45 | ||
46 | ||
47 | static void call_start(struct rpc_task *task); | |
48 | static void call_reserve(struct rpc_task *task); | |
49 | static void call_reserveresult(struct rpc_task *task); | |
50 | static void call_allocate(struct rpc_task *task); | |
51 | static void call_encode(struct rpc_task *task); | |
52 | static void call_decode(struct rpc_task *task); | |
53 | static void call_bind(struct rpc_task *task); | |
da351878 | 54 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
55 | static void call_transmit(struct rpc_task *task); |
56 | static void call_status(struct rpc_task *task); | |
940e3318 | 57 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
58 | static void call_refresh(struct rpc_task *task); |
59 | static void call_refreshresult(struct rpc_task *task); | |
60 | static void call_timeout(struct rpc_task *task); | |
61 | static void call_connect(struct rpc_task *task); | |
62 | static void call_connect_status(struct rpc_task *task); | |
d8ed029d AD |
63 | static __be32 * call_header(struct rpc_task *task); |
64 | static __be32 * call_verify(struct rpc_task *task); | |
1da177e4 LT |
65 | |
66 | ||
67 | static int | |
68 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
69 | { | |
f134585a | 70 | static uint32_t clntid; |
1da177e4 LT |
71 | int error; |
72 | ||
54281548 TM |
73 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
74 | clnt->cl_dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
75 | if (dir_name == NULL) |
76 | return 0; | |
54281548 TM |
77 | |
78 | clnt->cl_vfsmnt = rpc_get_mount(); | |
79 | if (IS_ERR(clnt->cl_vfsmnt)) | |
80 | return PTR_ERR(clnt->cl_vfsmnt); | |
81 | ||
f134585a TM |
82 | for (;;) { |
83 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
84 | "%s/clnt%x", dir_name, | |
85 | (unsigned int)clntid++); | |
86 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
87 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
88 | if (!IS_ERR(clnt->cl_dentry)) | |
89 | return 0; | |
1da177e4 | 90 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
91 | if (error != -EEXIST) { |
92 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
93 | clnt->cl_pathname, error); | |
54281548 | 94 | rpc_put_mount(); |
f134585a TM |
95 | return error; |
96 | } | |
1da177e4 LT |
97 | } |
98 | } | |
99 | ||
ff9aa5e5 | 100 | static struct rpc_clnt * rpc_new_client(struct rpc_xprt *xprt, char *servname, struct rpc_program *program, u32 vers, rpc_authflavor_t flavor) |
1da177e4 LT |
101 | { |
102 | struct rpc_version *version; | |
103 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 104 | struct rpc_auth *auth; |
1da177e4 LT |
105 | int err; |
106 | int len; | |
107 | ||
108 | dprintk("RPC: creating %s client for %s (xprt %p)\n", | |
109 | program->name, servname, xprt); | |
110 | ||
111 | err = -EINVAL; | |
112 | if (!xprt) | |
712917d1 | 113 | goto out_no_xprt; |
1da177e4 LT |
114 | if (vers >= program->nrvers || !(version = program->version[vers])) |
115 | goto out_err; | |
116 | ||
117 | err = -ENOMEM; | |
0da974f4 | 118 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
119 | if (!clnt) |
120 | goto out_err; | |
1da177e4 LT |
121 | atomic_set(&clnt->cl_users, 0); |
122 | atomic_set(&clnt->cl_count, 1); | |
123 | clnt->cl_parent = clnt; | |
124 | ||
125 | clnt->cl_server = clnt->cl_inline_name; | |
126 | len = strlen(servname) + 1; | |
127 | if (len > sizeof(clnt->cl_inline_name)) { | |
128 | char *buf = kmalloc(len, GFP_KERNEL); | |
129 | if (buf != 0) | |
130 | clnt->cl_server = buf; | |
131 | else | |
132 | len = sizeof(clnt->cl_inline_name); | |
133 | } | |
134 | strlcpy(clnt->cl_server, servname, len); | |
135 | ||
136 | clnt->cl_xprt = xprt; | |
137 | clnt->cl_procinfo = version->procs; | |
138 | clnt->cl_maxproc = version->nrprocs; | |
139 | clnt->cl_protname = program->name; | |
1da177e4 LT |
140 | clnt->cl_prog = program->number; |
141 | clnt->cl_vers = version->number; | |
1da177e4 | 142 | clnt->cl_stats = program->stats; |
11c556b3 | 143 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
144 | err = -ENOMEM; |
145 | if (clnt->cl_metrics == NULL) | |
146 | goto out_no_stats; | |
3e32a5d9 | 147 | clnt->cl_program = program; |
1da177e4 | 148 | |
ec739ef0 | 149 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
150 | clnt->cl_autobind = 1; |
151 | ||
152 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
153 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
154 | ||
155 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); | |
156 | if (err < 0) | |
157 | goto out_no_path; | |
158 | ||
6a19275a BF |
159 | auth = rpcauth_create(flavor, clnt); |
160 | if (IS_ERR(auth)) { | |
1da177e4 LT |
161 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
162 | flavor); | |
6a19275a | 163 | err = PTR_ERR(auth); |
1da177e4 LT |
164 | goto out_no_auth; |
165 | } | |
166 | ||
167 | /* save the nodename */ | |
e9ff3990 | 168 | clnt->cl_nodelen = strlen(utsname()->nodename); |
1da177e4 LT |
169 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
170 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
e9ff3990 | 171 | memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen); |
1da177e4 LT |
172 | return clnt; |
173 | ||
174 | out_no_auth: | |
54281548 | 175 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 176 | rpc_rmdir(clnt->cl_dentry); |
54281548 TM |
177 | rpc_put_mount(); |
178 | } | |
1da177e4 | 179 | out_no_path: |
23bf85ba TM |
180 | rpc_free_iostats(clnt->cl_metrics); |
181 | out_no_stats: | |
1da177e4 LT |
182 | if (clnt->cl_server != clnt->cl_inline_name) |
183 | kfree(clnt->cl_server); | |
184 | kfree(clnt); | |
185 | out_err: | |
6b6ca86b | 186 | xprt_put(xprt); |
712917d1 | 187 | out_no_xprt: |
1da177e4 LT |
188 | return ERR_PTR(err); |
189 | } | |
190 | ||
c2866763 CL |
191 | /* |
192 | * rpc_create - create an RPC client and transport with one call | |
193 | * @args: rpc_clnt create argument structure | |
194 | * | |
195 | * Creates and initializes an RPC transport and an RPC client. | |
196 | * | |
197 | * It can ping the server in order to determine if it is up, and to see if | |
198 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
199 | * this behavior so asynchronous tasks can also use rpc_create. | |
200 | */ | |
201 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
202 | { | |
203 | struct rpc_xprt *xprt; | |
204 | struct rpc_clnt *clnt; | |
205 | ||
206 | xprt = xprt_create_transport(args->protocol, args->address, | |
207 | args->addrsize, args->timeout); | |
208 | if (IS_ERR(xprt)) | |
209 | return (struct rpc_clnt *)xprt; | |
210 | ||
211 | /* | |
212 | * By default, kernel RPC client connects from a reserved port. | |
213 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
214 | * but it is always enabled for rpciod, which handles the connect | |
215 | * operation. | |
216 | */ | |
217 | xprt->resvport = 1; | |
218 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
219 | xprt->resvport = 0; | |
220 | ||
221 | dprintk("RPC: creating %s client for %s (xprt %p)\n", | |
222 | args->program->name, args->servername, xprt); | |
223 | ||
224 | clnt = rpc_new_client(xprt, args->servername, args->program, | |
225 | args->version, args->authflavor); | |
226 | if (IS_ERR(clnt)) | |
227 | return clnt; | |
228 | ||
229 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
230 | int err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
231 | if (err != 0) { | |
232 | rpc_shutdown_client(clnt); | |
233 | return ERR_PTR(err); | |
234 | } | |
235 | } | |
236 | ||
237 | clnt->cl_softrtry = 1; | |
238 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
239 | clnt->cl_softrtry = 0; | |
240 | ||
241 | if (args->flags & RPC_CLNT_CREATE_INTR) | |
242 | clnt->cl_intr = 1; | |
243 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
244 | clnt->cl_autobind = 1; | |
245 | if (args->flags & RPC_CLNT_CREATE_ONESHOT) | |
246 | clnt->cl_oneshot = 1; | |
247 | ||
248 | return clnt; | |
249 | } | |
b86acd50 | 250 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 251 | |
1da177e4 LT |
252 | /* |
253 | * This function clones the RPC client structure. It allows us to share the | |
254 | * same transport while varying parameters such as the authentication | |
255 | * flavour. | |
256 | */ | |
257 | struct rpc_clnt * | |
258 | rpc_clone_client(struct rpc_clnt *clnt) | |
259 | { | |
260 | struct rpc_clnt *new; | |
3e32a5d9 | 261 | int err = -ENOMEM; |
1da177e4 | 262 | |
e69062b4 | 263 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
264 | if (!new) |
265 | goto out_no_clnt; | |
1da177e4 LT |
266 | atomic_set(&new->cl_count, 1); |
267 | atomic_set(&new->cl_users, 0); | |
23bf85ba TM |
268 | new->cl_metrics = rpc_alloc_iostats(clnt); |
269 | if (new->cl_metrics == NULL) | |
270 | goto out_no_stats; | |
3e32a5d9 TM |
271 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
272 | if (err != 0) | |
273 | goto out_no_path; | |
1da177e4 LT |
274 | new->cl_parent = clnt; |
275 | atomic_inc(&clnt->cl_count); | |
6b6ca86b | 276 | new->cl_xprt = xprt_get(clnt->cl_xprt); |
1da177e4 LT |
277 | /* Turn off autobind on clones */ |
278 | new->cl_autobind = 0; | |
279 | new->cl_oneshot = 0; | |
280 | new->cl_dead = 0; | |
281 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); | |
282 | if (new->cl_auth) | |
283 | atomic_inc(&new->cl_auth->au_count); | |
284 | return new; | |
3e32a5d9 TM |
285 | out_no_path: |
286 | rpc_free_iostats(new->cl_metrics); | |
23bf85ba TM |
287 | out_no_stats: |
288 | kfree(new); | |
1da177e4 | 289 | out_no_clnt: |
3e32a5d9 TM |
290 | dprintk("RPC: %s returned error %d\n", __FUNCTION__, err); |
291 | return ERR_PTR(err); | |
1da177e4 LT |
292 | } |
293 | ||
294 | /* | |
295 | * Properly shut down an RPC client, terminating all outstanding | |
296 | * requests. Note that we must be certain that cl_oneshot and | |
297 | * cl_dead are cleared, or else the client would be destroyed | |
298 | * when the last task releases it. | |
299 | */ | |
300 | int | |
301 | rpc_shutdown_client(struct rpc_clnt *clnt) | |
302 | { | |
303 | dprintk("RPC: shutting down %s client for %s, tasks=%d\n", | |
304 | clnt->cl_protname, clnt->cl_server, | |
305 | atomic_read(&clnt->cl_users)); | |
306 | ||
307 | while (atomic_read(&clnt->cl_users) > 0) { | |
308 | /* Don't let rpc_release_client destroy us */ | |
309 | clnt->cl_oneshot = 0; | |
310 | clnt->cl_dead = 0; | |
311 | rpc_killall_tasks(clnt); | |
532347e2 | 312 | wait_event_timeout(destroy_wait, |
4f47707b | 313 | !atomic_read(&clnt->cl_users), 1*HZ); |
1da177e4 LT |
314 | } |
315 | ||
316 | if (atomic_read(&clnt->cl_users) < 0) { | |
317 | printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", | |
318 | clnt, atomic_read(&clnt->cl_users)); | |
319 | #ifdef RPC_DEBUG | |
320 | rpc_show_tasks(); | |
321 | #endif | |
322 | BUG(); | |
323 | } | |
324 | ||
325 | return rpc_destroy_client(clnt); | |
326 | } | |
327 | ||
328 | /* | |
329 | * Delete an RPC client | |
330 | */ | |
331 | int | |
332 | rpc_destroy_client(struct rpc_clnt *clnt) | |
333 | { | |
334 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
335 | return 1; | |
336 | BUG_ON(atomic_read(&clnt->cl_users) != 0); | |
337 | ||
338 | dprintk("RPC: destroying %s client for %s\n", | |
339 | clnt->cl_protname, clnt->cl_server); | |
340 | if (clnt->cl_auth) { | |
341 | rpcauth_destroy(clnt->cl_auth); | |
342 | clnt->cl_auth = NULL; | |
343 | } | |
8f8e7a50 | 344 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 345 | rpc_rmdir(clnt->cl_dentry); |
8f8e7a50 TM |
346 | rpc_put_mount(); |
347 | } | |
3e32a5d9 TM |
348 | if (clnt->cl_parent != clnt) { |
349 | rpc_destroy_client(clnt->cl_parent); | |
350 | goto out_free; | |
351 | } | |
1da177e4 LT |
352 | if (clnt->cl_server != clnt->cl_inline_name) |
353 | kfree(clnt->cl_server); | |
354 | out_free: | |
11c556b3 CL |
355 | rpc_free_iostats(clnt->cl_metrics); |
356 | clnt->cl_metrics = NULL; | |
6b6ca86b | 357 | xprt_put(clnt->cl_xprt); |
1da177e4 LT |
358 | kfree(clnt); |
359 | return 0; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Release an RPC client | |
364 | */ | |
365 | void | |
366 | rpc_release_client(struct rpc_clnt *clnt) | |
367 | { | |
368 | dprintk("RPC: rpc_release_client(%p, %d)\n", | |
369 | clnt, atomic_read(&clnt->cl_users)); | |
370 | ||
371 | if (!atomic_dec_and_test(&clnt->cl_users)) | |
372 | return; | |
373 | wake_up(&destroy_wait); | |
374 | if (clnt->cl_oneshot || clnt->cl_dead) | |
375 | rpc_destroy_client(clnt); | |
376 | } | |
377 | ||
007e251f AG |
378 | /** |
379 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
380 | * @old - old rpc_client | |
381 | * @program - rpc program to set | |
382 | * @vers - rpc program version | |
383 | * | |
384 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
385 | * of use for enabling different RPC programs to share the same transport. | |
386 | * The Sun NFSv2/v3 ACL protocol can do this. | |
387 | */ | |
388 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
389 | struct rpc_program *program, | |
390 | int vers) | |
391 | { | |
392 | struct rpc_clnt *clnt; | |
393 | struct rpc_version *version; | |
394 | int err; | |
395 | ||
396 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
397 | version = program->version[vers]; | |
398 | clnt = rpc_clone_client(old); | |
399 | if (IS_ERR(clnt)) | |
400 | goto out; | |
401 | clnt->cl_procinfo = version->procs; | |
402 | clnt->cl_maxproc = version->nrprocs; | |
403 | clnt->cl_protname = program->name; | |
404 | clnt->cl_prog = program->number; | |
405 | clnt->cl_vers = version->number; | |
406 | clnt->cl_stats = program->stats; | |
407 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
408 | if (err != 0) { | |
409 | rpc_shutdown_client(clnt); | |
410 | clnt = ERR_PTR(err); | |
411 | } | |
412 | out: | |
413 | return clnt; | |
414 | } | |
415 | ||
1da177e4 LT |
416 | /* |
417 | * Default callback for async RPC calls | |
418 | */ | |
419 | static void | |
963d8fe5 | 420 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
421 | { |
422 | } | |
423 | ||
963d8fe5 TM |
424 | static const struct rpc_call_ops rpc_default_ops = { |
425 | .rpc_call_done = rpc_default_callback, | |
426 | }; | |
427 | ||
1da177e4 | 428 | /* |
14b218a8 | 429 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
430 | * sleeps on RPC calls |
431 | */ | |
2bd61579 | 432 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
1da177e4 | 433 | |
14b218a8 TM |
434 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
435 | { | |
2bd61579 | 436 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
437 | sigset_t sigmask; |
438 | ||
439 | /* Block all signals except those listed in sigallow */ | |
440 | if (intr) | |
441 | sigallow |= RPC_INTR_SIGNALS; | |
442 | siginitsetinv(&sigmask, sigallow); | |
443 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
444 | } | |
445 | ||
446 | static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) | |
447 | { | |
448 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
449 | } | |
450 | ||
451 | static inline void rpc_restore_sigmask(sigset_t *oldset) | |
452 | { | |
453 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
454 | } | |
455 | ||
1da177e4 LT |
456 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
457 | { | |
14b218a8 | 458 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 LT |
459 | } |
460 | ||
461 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
462 | { | |
14b218a8 | 463 | rpc_restore_sigmask(oldset); |
1da177e4 LT |
464 | } |
465 | ||
466 | /* | |
467 | * New rpc_call implementation | |
468 | */ | |
469 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
470 | { | |
471 | struct rpc_task *task; | |
472 | sigset_t oldset; | |
473 | int status; | |
474 | ||
475 | /* If this client is slain all further I/O fails */ | |
476 | if (clnt->cl_dead) | |
477 | return -EIO; | |
478 | ||
479 | BUG_ON(flags & RPC_TASK_ASYNC); | |
480 | ||
963d8fe5 | 481 | task = rpc_new_task(clnt, flags, &rpc_default_ops, NULL); |
1da177e4 | 482 | if (task == NULL) |
e6b3c4db | 483 | return -ENOMEM; |
1da177e4 | 484 | |
14b218a8 TM |
485 | /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ |
486 | rpc_task_sigmask(task, &oldset); | |
487 | ||
1da177e4 LT |
488 | rpc_call_setup(task, msg, 0); |
489 | ||
490 | /* Set up the call info struct and execute the task */ | |
e60859ac | 491 | status = task->tk_status; |
e6b3c4db TM |
492 | if (status != 0) { |
493 | rpc_release_task(task); | |
494 | goto out; | |
1da177e4 | 495 | } |
e6b3c4db TM |
496 | atomic_inc(&task->tk_count); |
497 | status = rpc_execute(task); | |
498 | if (status == 0) | |
499 | status = task->tk_status; | |
500 | rpc_put_task(task); | |
1da177e4 | 501 | out: |
e6b3c4db | 502 | rpc_restore_sigmask(&oldset); |
1da177e4 LT |
503 | return status; |
504 | } | |
505 | ||
506 | /* | |
507 | * New rpc_call implementation | |
508 | */ | |
509 | int | |
510 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 511 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
512 | { |
513 | struct rpc_task *task; | |
514 | sigset_t oldset; | |
515 | int status; | |
516 | ||
517 | /* If this client is slain all further I/O fails */ | |
7a1218a2 | 518 | status = -EIO; |
1da177e4 | 519 | if (clnt->cl_dead) |
7a1218a2 | 520 | goto out_release; |
1da177e4 LT |
521 | |
522 | flags |= RPC_TASK_ASYNC; | |
523 | ||
1da177e4 | 524 | /* Create/initialize a new RPC task */ |
1da177e4 | 525 | status = -ENOMEM; |
963d8fe5 | 526 | if (!(task = rpc_new_task(clnt, flags, tk_ops, data))) |
7a1218a2 | 527 | goto out_release; |
1da177e4 | 528 | |
14b218a8 TM |
529 | /* Mask signals on GSS_AUTH upcalls */ |
530 | rpc_task_sigmask(task, &oldset); | |
531 | ||
1da177e4 LT |
532 | rpc_call_setup(task, msg, 0); |
533 | ||
534 | /* Set up the call info struct and execute the task */ | |
535 | status = task->tk_status; | |
536 | if (status == 0) | |
537 | rpc_execute(task); | |
538 | else | |
539 | rpc_release_task(task); | |
540 | ||
14b218a8 | 541 | rpc_restore_sigmask(&oldset); |
7a1218a2 TM |
542 | return status; |
543 | out_release: | |
bbd5a1f9 | 544 | rpc_release_calldata(tk_ops, data); |
1da177e4 LT |
545 | return status; |
546 | } | |
547 | ||
548 | ||
549 | void | |
550 | rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) | |
551 | { | |
552 | task->tk_msg = *msg; | |
553 | task->tk_flags |= flags; | |
554 | /* Bind the user cred */ | |
555 | if (task->tk_msg.rpc_cred != NULL) | |
556 | rpcauth_holdcred(task); | |
557 | else | |
558 | rpcauth_bindcred(task); | |
559 | ||
560 | if (task->tk_status == 0) | |
561 | task->tk_action = call_start; | |
562 | else | |
abbcf28f | 563 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
564 | } |
565 | ||
ed39440a CL |
566 | /** |
567 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
568 | * @clnt: RPC client structure | |
569 | * @buf: target buffer | |
570 | * @size: length of target buffer | |
571 | * | |
572 | * Returns the number of bytes that are actually in the stored address. | |
573 | */ | |
574 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
575 | { | |
576 | size_t bytes; | |
577 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
578 | ||
579 | bytes = sizeof(xprt->addr); | |
580 | if (bytes > bufsize) | |
581 | bytes = bufsize; | |
582 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 583 | return xprt->addrlen; |
ed39440a | 584 | } |
b86acd50 | 585 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 586 | |
f425eba4 CL |
587 | /** |
588 | * rpc_peeraddr2str - return remote peer address in printable format | |
589 | * @clnt: RPC client structure | |
590 | * @format: address format | |
591 | * | |
592 | */ | |
593 | char *rpc_peeraddr2str(struct rpc_clnt *clnt, enum rpc_display_format_t format) | |
594 | { | |
595 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
596 | return xprt->ops->print_addr(xprt, format); | |
597 | } | |
b86acd50 | 598 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 599 | |
1da177e4 LT |
600 | void |
601 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
602 | { | |
603 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
604 | if (xprt->ops->set_buffer_size) |
605 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 LT |
606 | } |
607 | ||
608 | /* | |
609 | * Return size of largest payload RPC client can support, in bytes | |
610 | * | |
611 | * For stream transports, this is one RPC record fragment (see RFC | |
612 | * 1831), as we don't support multi-record requests yet. For datagram | |
613 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
614 | * RPC header sizes. | |
615 | */ | |
616 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
617 | { | |
618 | return clnt->cl_xprt->max_payload; | |
619 | } | |
b86acd50 | 620 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 621 | |
35f5a422 CL |
622 | /** |
623 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
624 | * @clnt: client to rebind | |
625 | * | |
626 | */ | |
627 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
628 | { | |
629 | if (clnt->cl_autobind) | |
ec739ef0 | 630 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 631 | } |
b86acd50 | 632 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 633 | |
1da177e4 LT |
634 | /* |
635 | * Restart an (async) RPC call. Usually called from within the | |
636 | * exit handler. | |
637 | */ | |
638 | void | |
639 | rpc_restart_call(struct rpc_task *task) | |
640 | { | |
641 | if (RPC_ASSASSINATED(task)) | |
642 | return; | |
643 | ||
644 | task->tk_action = call_start; | |
645 | } | |
646 | ||
647 | /* | |
648 | * 0. Initial state | |
649 | * | |
650 | * Other FSM states can be visited zero or more times, but | |
651 | * this state is visited exactly once for each RPC. | |
652 | */ | |
653 | static void | |
654 | call_start(struct rpc_task *task) | |
655 | { | |
656 | struct rpc_clnt *clnt = task->tk_client; | |
657 | ||
658 | dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid, | |
659 | clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc, | |
660 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
661 | ||
662 | /* Increment call count */ | |
663 | task->tk_msg.rpc_proc->p_count++; | |
664 | clnt->cl_stats->rpccnt++; | |
665 | task->tk_action = call_reserve; | |
666 | } | |
667 | ||
668 | /* | |
669 | * 1. Reserve an RPC call slot | |
670 | */ | |
671 | static void | |
672 | call_reserve(struct rpc_task *task) | |
673 | { | |
674 | dprintk("RPC: %4d call_reserve\n", task->tk_pid); | |
675 | ||
676 | if (!rpcauth_uptodatecred(task)) { | |
677 | task->tk_action = call_refresh; | |
678 | return; | |
679 | } | |
680 | ||
681 | task->tk_status = 0; | |
682 | task->tk_action = call_reserveresult; | |
683 | xprt_reserve(task); | |
684 | } | |
685 | ||
686 | /* | |
687 | * 1b. Grok the result of xprt_reserve() | |
688 | */ | |
689 | static void | |
690 | call_reserveresult(struct rpc_task *task) | |
691 | { | |
692 | int status = task->tk_status; | |
693 | ||
694 | dprintk("RPC: %4d call_reserveresult (status %d)\n", | |
695 | task->tk_pid, task->tk_status); | |
696 | ||
697 | /* | |
698 | * After a call to xprt_reserve(), we must have either | |
699 | * a request slot or else an error status. | |
700 | */ | |
701 | task->tk_status = 0; | |
702 | if (status >= 0) { | |
703 | if (task->tk_rqstp) { | |
704 | task->tk_action = call_allocate; | |
705 | return; | |
706 | } | |
707 | ||
708 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
709 | __FUNCTION__, status); | |
710 | rpc_exit(task, -EIO); | |
711 | return; | |
712 | } | |
713 | ||
714 | /* | |
715 | * Even though there was an error, we may have acquired | |
716 | * a request slot somehow. Make sure not to leak it. | |
717 | */ | |
718 | if (task->tk_rqstp) { | |
719 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
720 | __FUNCTION__, status); | |
721 | xprt_release(task); | |
722 | } | |
723 | ||
724 | switch (status) { | |
725 | case -EAGAIN: /* woken up; retry */ | |
726 | task->tk_action = call_reserve; | |
727 | return; | |
728 | case -EIO: /* probably a shutdown */ | |
729 | break; | |
730 | default: | |
731 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
732 | __FUNCTION__, status); | |
733 | break; | |
734 | } | |
735 | rpc_exit(task, status); | |
736 | } | |
737 | ||
738 | /* | |
739 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 740 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
741 | */ |
742 | static void | |
743 | call_allocate(struct rpc_task *task) | |
744 | { | |
02107148 CL |
745 | struct rpc_rqst *req = task->tk_rqstp; |
746 | struct rpc_xprt *xprt = task->tk_xprt; | |
1da177e4 LT |
747 | unsigned int bufsiz; |
748 | ||
749 | dprintk("RPC: %4d call_allocate (status %d)\n", | |
750 | task->tk_pid, task->tk_status); | |
751 | task->tk_action = call_bind; | |
02107148 | 752 | if (req->rq_buffer) |
1da177e4 LT |
753 | return; |
754 | ||
755 | /* FIXME: compute buffer requirements more exactly using | |
756 | * auth->au_wslack */ | |
757 | bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE; | |
758 | ||
02107148 | 759 | if (xprt->ops->buf_alloc(task, bufsiz << 1) != NULL) |
1da177e4 LT |
760 | return; |
761 | printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); | |
762 | ||
14b218a8 | 763 | if (RPC_IS_ASYNC(task) || !signalled()) { |
1da177e4 LT |
764 | xprt_release(task); |
765 | task->tk_action = call_reserve; | |
766 | rpc_delay(task, HZ>>4); | |
767 | return; | |
768 | } | |
769 | ||
770 | rpc_exit(task, -ERESTARTSYS); | |
771 | } | |
772 | ||
940e3318 TM |
773 | static inline int |
774 | rpc_task_need_encode(struct rpc_task *task) | |
775 | { | |
776 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
777 | } | |
778 | ||
779 | static inline void | |
780 | rpc_task_force_reencode(struct rpc_task *task) | |
781 | { | |
782 | task->tk_rqstp->rq_snd_buf.len = 0; | |
783 | } | |
784 | ||
1da177e4 LT |
785 | /* |
786 | * 3. Encode arguments of an RPC call | |
787 | */ | |
788 | static void | |
789 | call_encode(struct rpc_task *task) | |
790 | { | |
1da177e4 LT |
791 | struct rpc_rqst *req = task->tk_rqstp; |
792 | struct xdr_buf *sndbuf = &req->rq_snd_buf; | |
793 | struct xdr_buf *rcvbuf = &req->rq_rcv_buf; | |
794 | unsigned int bufsiz; | |
795 | kxdrproc_t encode; | |
d8ed029d | 796 | __be32 *p; |
1da177e4 LT |
797 | |
798 | dprintk("RPC: %4d call_encode (status %d)\n", | |
799 | task->tk_pid, task->tk_status); | |
800 | ||
801 | /* Default buffer setup */ | |
02107148 CL |
802 | bufsiz = req->rq_bufsize >> 1; |
803 | sndbuf->head[0].iov_base = (void *)req->rq_buffer; | |
1da177e4 LT |
804 | sndbuf->head[0].iov_len = bufsiz; |
805 | sndbuf->tail[0].iov_len = 0; | |
806 | sndbuf->page_len = 0; | |
807 | sndbuf->len = 0; | |
808 | sndbuf->buflen = bufsiz; | |
02107148 | 809 | rcvbuf->head[0].iov_base = (void *)((char *)req->rq_buffer + bufsiz); |
1da177e4 LT |
810 | rcvbuf->head[0].iov_len = bufsiz; |
811 | rcvbuf->tail[0].iov_len = 0; | |
812 | rcvbuf->page_len = 0; | |
813 | rcvbuf->len = 0; | |
814 | rcvbuf->buflen = bufsiz; | |
815 | ||
816 | /* Encode header and provided arguments */ | |
817 | encode = task->tk_msg.rpc_proc->p_encode; | |
818 | if (!(p = call_header(task))) { | |
819 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
820 | rpc_exit(task, -EIO); | |
821 | return; | |
822 | } | |
f3680312 BF |
823 | if (encode == NULL) |
824 | return; | |
825 | ||
826 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
827 | task->tk_msg.rpc_argp); | |
828 | if (task->tk_status == -ENOMEM) { | |
829 | /* XXX: Is this sane? */ | |
830 | rpc_delay(task, 3*HZ); | |
831 | task->tk_status = -EAGAIN; | |
832 | } | |
1da177e4 LT |
833 | } |
834 | ||
835 | /* | |
836 | * 4. Get the server port number if not yet set | |
837 | */ | |
838 | static void | |
839 | call_bind(struct rpc_task *task) | |
840 | { | |
ec739ef0 | 841 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 842 | |
da351878 CL |
843 | dprintk("RPC: %4d call_bind (status %d)\n", |
844 | task->tk_pid, task->tk_status); | |
1da177e4 | 845 | |
da351878 | 846 | task->tk_action = call_connect; |
ec739ef0 | 847 | if (!xprt_bound(xprt)) { |
da351878 | 848 | task->tk_action = call_bind_status; |
ec739ef0 | 849 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 850 | xprt->ops->rpcbind(task); |
1da177e4 LT |
851 | } |
852 | } | |
853 | ||
854 | /* | |
da351878 CL |
855 | * 4a. Sort out bind result |
856 | */ | |
857 | static void | |
858 | call_bind_status(struct rpc_task *task) | |
859 | { | |
860 | int status = -EACCES; | |
861 | ||
862 | if (task->tk_status >= 0) { | |
863 | dprintk("RPC: %4d call_bind_status (status %d)\n", | |
864 | task->tk_pid, task->tk_status); | |
865 | task->tk_status = 0; | |
866 | task->tk_action = call_connect; | |
867 | return; | |
868 | } | |
869 | ||
870 | switch (task->tk_status) { | |
871 | case -EACCES: | |
872 | dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n", | |
873 | task->tk_pid); | |
ea635a51 | 874 | rpc_delay(task, 3*HZ); |
da45828e | 875 | goto retry_timeout; |
da351878 CL |
876 | case -ETIMEDOUT: |
877 | dprintk("RPC: %4d rpcbind request timed out\n", | |
878 | task->tk_pid); | |
da45828e | 879 | goto retry_timeout; |
da351878 CL |
880 | case -EPFNOSUPPORT: |
881 | dprintk("RPC: %4d remote rpcbind service unavailable\n", | |
882 | task->tk_pid); | |
883 | break; | |
884 | case -EPROTONOSUPPORT: | |
885 | dprintk("RPC: %4d remote rpcbind version 2 unavailable\n", | |
886 | task->tk_pid); | |
887 | break; | |
888 | default: | |
889 | dprintk("RPC: %4d unrecognized rpcbind error (%d)\n", | |
890 | task->tk_pid, -task->tk_status); | |
891 | status = -EIO; | |
da351878 CL |
892 | } |
893 | ||
894 | rpc_exit(task, status); | |
895 | return; | |
896 | ||
da45828e TM |
897 | retry_timeout: |
898 | task->tk_action = call_timeout; | |
da351878 CL |
899 | } |
900 | ||
901 | /* | |
902 | * 4b. Connect to the RPC server | |
1da177e4 LT |
903 | */ |
904 | static void | |
905 | call_connect(struct rpc_task *task) | |
906 | { | |
da351878 | 907 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 908 | |
da351878 CL |
909 | dprintk("RPC: %4d call_connect xprt %p %s connected\n", |
910 | task->tk_pid, xprt, | |
911 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 912 | |
da351878 CL |
913 | task->tk_action = call_transmit; |
914 | if (!xprt_connected(xprt)) { | |
915 | task->tk_action = call_connect_status; | |
916 | if (task->tk_status < 0) | |
917 | return; | |
918 | xprt_connect(task); | |
1da177e4 | 919 | } |
1da177e4 LT |
920 | } |
921 | ||
922 | /* | |
da351878 | 923 | * 4c. Sort out connect result |
1da177e4 LT |
924 | */ |
925 | static void | |
926 | call_connect_status(struct rpc_task *task) | |
927 | { | |
928 | struct rpc_clnt *clnt = task->tk_client; | |
929 | int status = task->tk_status; | |
930 | ||
da351878 CL |
931 | dprintk("RPC: %5u call_connect_status (status %d)\n", |
932 | task->tk_pid, task->tk_status); | |
933 | ||
1da177e4 LT |
934 | task->tk_status = 0; |
935 | if (status >= 0) { | |
936 | clnt->cl_stats->netreconn++; | |
937 | task->tk_action = call_transmit; | |
938 | return; | |
939 | } | |
940 | ||
da351878 | 941 | /* Something failed: remote service port may have changed */ |
35f5a422 | 942 | rpc_force_rebind(clnt); |
da351878 | 943 | |
1da177e4 LT |
944 | switch (status) { |
945 | case -ENOTCONN: | |
1da177e4 | 946 | case -EAGAIN: |
da351878 | 947 | task->tk_action = call_bind; |
da45828e TM |
948 | if (!RPC_IS_SOFT(task)) |
949 | return; | |
950 | /* if soft mounted, test if we've timed out */ | |
951 | case -ETIMEDOUT: | |
952 | task->tk_action = call_timeout; | |
953 | return; | |
1da177e4 | 954 | } |
da45828e | 955 | rpc_exit(task, -EIO); |
1da177e4 LT |
956 | } |
957 | ||
958 | /* | |
959 | * 5. Transmit the RPC request, and wait for reply | |
960 | */ | |
961 | static void | |
962 | call_transmit(struct rpc_task *task) | |
963 | { | |
964 | dprintk("RPC: %4d call_transmit (status %d)\n", | |
965 | task->tk_pid, task->tk_status); | |
966 | ||
967 | task->tk_action = call_status; | |
968 | if (task->tk_status < 0) | |
969 | return; | |
970 | task->tk_status = xprt_prepare_transmit(task); | |
971 | if (task->tk_status != 0) | |
972 | return; | |
e0ab53de | 973 | task->tk_action = call_transmit_status; |
1da177e4 | 974 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 975 | if (rpc_task_need_encode(task)) { |
e0ab53de | 976 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
1da177e4 | 977 | call_encode(task); |
5e5ce5be TM |
978 | /* Did the encode result in an error condition? */ |
979 | if (task->tk_status != 0) | |
e0ab53de | 980 | return; |
5e5ce5be | 981 | } |
1da177e4 LT |
982 | xprt_transmit(task); |
983 | if (task->tk_status < 0) | |
984 | return; | |
e0ab53de TM |
985 | /* |
986 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
987 | * in order to allow access to the socket to other RPC requests. | |
988 | */ | |
989 | call_transmit_status(task); | |
990 | if (task->tk_msg.rpc_proc->p_decode != NULL) | |
991 | return; | |
992 | task->tk_action = rpc_exit_task; | |
993 | rpc_wake_up_task(task); | |
994 | } | |
995 | ||
996 | /* | |
997 | * 5a. Handle cleanup after a transmission | |
998 | */ | |
999 | static void | |
1000 | call_transmit_status(struct rpc_task *task) | |
1001 | { | |
1002 | task->tk_action = call_status; | |
1003 | /* | |
1004 | * Special case: if we've been waiting on the socket's write_space() | |
1005 | * callback, then don't call xprt_end_transmit(). | |
1006 | */ | |
1007 | if (task->tk_status == -EAGAIN) | |
1008 | return; | |
1009 | xprt_end_transmit(task); | |
940e3318 | 1010 | rpc_task_force_reencode(task); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | /* | |
1014 | * 6. Sort out the RPC call status | |
1015 | */ | |
1016 | static void | |
1017 | call_status(struct rpc_task *task) | |
1018 | { | |
1019 | struct rpc_clnt *clnt = task->tk_client; | |
1020 | struct rpc_rqst *req = task->tk_rqstp; | |
1021 | int status; | |
1022 | ||
1023 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
1024 | task->tk_status = req->rq_received; | |
1025 | ||
1026 | dprintk("RPC: %4d call_status (status %d)\n", | |
1027 | task->tk_pid, task->tk_status); | |
1028 | ||
1029 | status = task->tk_status; | |
1030 | if (status >= 0) { | |
1031 | task->tk_action = call_decode; | |
1032 | return; | |
1033 | } | |
1034 | ||
1035 | task->tk_status = 0; | |
1036 | switch(status) { | |
76303992 TM |
1037 | case -EHOSTDOWN: |
1038 | case -EHOSTUNREACH: | |
1039 | case -ENETUNREACH: | |
1040 | /* | |
1041 | * Delay any retries for 3 seconds, then handle as if it | |
1042 | * were a timeout. | |
1043 | */ | |
1044 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1045 | case -ETIMEDOUT: |
1046 | task->tk_action = call_timeout; | |
1047 | break; | |
1048 | case -ECONNREFUSED: | |
1049 | case -ENOTCONN: | |
35f5a422 | 1050 | rpc_force_rebind(clnt); |
1da177e4 LT |
1051 | task->tk_action = call_bind; |
1052 | break; | |
1053 | case -EAGAIN: | |
1054 | task->tk_action = call_transmit; | |
1055 | break; | |
1056 | case -EIO: | |
1057 | /* shutdown or soft timeout */ | |
1058 | rpc_exit(task, status); | |
1059 | break; | |
1060 | default: | |
f518e35a | 1061 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
1062 | clnt->cl_protname, -status); |
1063 | rpc_exit(task, status); | |
1da177e4 LT |
1064 | } |
1065 | } | |
1066 | ||
1067 | /* | |
e0ab53de | 1068 | * 6a. Handle RPC timeout |
1da177e4 LT |
1069 | * We do not release the request slot, so we keep using the |
1070 | * same XID for all retransmits. | |
1071 | */ | |
1072 | static void | |
1073 | call_timeout(struct rpc_task *task) | |
1074 | { | |
1075 | struct rpc_clnt *clnt = task->tk_client; | |
1076 | ||
1077 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
1078 | dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid); | |
1079 | goto retry; | |
1080 | } | |
1081 | ||
1082 | dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid); | |
ef759a2e CL |
1083 | task->tk_timeouts++; |
1084 | ||
1da177e4 | 1085 | if (RPC_IS_SOFT(task)) { |
f518e35a | 1086 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
1087 | clnt->cl_protname, clnt->cl_server); |
1088 | rpc_exit(task, -EIO); | |
1089 | return; | |
1090 | } | |
1091 | ||
f518e35a | 1092 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1093 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1094 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1095 | clnt->cl_protname, clnt->cl_server); | |
1096 | } | |
35f5a422 | 1097 | rpc_force_rebind(clnt); |
1da177e4 LT |
1098 | |
1099 | retry: | |
1100 | clnt->cl_stats->rpcretrans++; | |
1101 | task->tk_action = call_bind; | |
1102 | task->tk_status = 0; | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * 7. Decode the RPC reply | |
1107 | */ | |
1108 | static void | |
1109 | call_decode(struct rpc_task *task) | |
1110 | { | |
1111 | struct rpc_clnt *clnt = task->tk_client; | |
1112 | struct rpc_rqst *req = task->tk_rqstp; | |
1113 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1114 | __be32 *p; |
1da177e4 LT |
1115 | |
1116 | dprintk("RPC: %4d call_decode (status %d)\n", | |
1117 | task->tk_pid, task->tk_status); | |
1118 | ||
f518e35a | 1119 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1120 | printk(KERN_NOTICE "%s: server %s OK\n", |
1121 | clnt->cl_protname, clnt->cl_server); | |
1122 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1123 | } | |
1124 | ||
1125 | if (task->tk_status < 12) { | |
1126 | if (!RPC_IS_SOFT(task)) { | |
1127 | task->tk_action = call_bind; | |
1128 | clnt->cl_stats->rpcretrans++; | |
1129 | goto out_retry; | |
1130 | } | |
da45828e | 1131 | dprintk("%s: too small RPC reply size (%d bytes)\n", |
1da177e4 | 1132 | clnt->cl_protname, task->tk_status); |
da45828e TM |
1133 | task->tk_action = call_timeout; |
1134 | goto out_retry; | |
1da177e4 LT |
1135 | } |
1136 | ||
43ac3f29 TM |
1137 | /* |
1138 | * Ensure that we see all writes made by xprt_complete_rqst() | |
1139 | * before it changed req->rq_received. | |
1140 | */ | |
1141 | smp_rmb(); | |
1da177e4 LT |
1142 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1143 | ||
1144 | /* Check that the softirq receive buffer is valid */ | |
1145 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1146 | sizeof(req->rq_rcv_buf)) != 0); | |
1147 | ||
1148 | /* Verify the RPC header */ | |
abbcf28f TM |
1149 | p = call_verify(task); |
1150 | if (IS_ERR(p)) { | |
1151 | if (p == ERR_PTR(-EAGAIN)) | |
1152 | goto out_retry; | |
1153 | return; | |
1da177e4 LT |
1154 | } |
1155 | ||
abbcf28f | 1156 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
1157 | |
1158 | if (decode) | |
1159 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, | |
1160 | task->tk_msg.rpc_resp); | |
1161 | dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, | |
1162 | task->tk_status); | |
1163 | return; | |
1164 | out_retry: | |
1165 | req->rq_received = req->rq_private_buf.len = 0; | |
1166 | task->tk_status = 0; | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * 8. Refresh the credentials if rejected by the server | |
1171 | */ | |
1172 | static void | |
1173 | call_refresh(struct rpc_task *task) | |
1174 | { | |
1175 | dprintk("RPC: %4d call_refresh\n", task->tk_pid); | |
1176 | ||
1177 | xprt_release(task); /* Must do to obtain new XID */ | |
1178 | task->tk_action = call_refreshresult; | |
1179 | task->tk_status = 0; | |
1180 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1181 | rpcauth_refreshcred(task); | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * 8a. Process the results of a credential refresh | |
1186 | */ | |
1187 | static void | |
1188 | call_refreshresult(struct rpc_task *task) | |
1189 | { | |
1190 | int status = task->tk_status; | |
1191 | dprintk("RPC: %4d call_refreshresult (status %d)\n", | |
1192 | task->tk_pid, task->tk_status); | |
1193 | ||
1194 | task->tk_status = 0; | |
1195 | task->tk_action = call_reserve; | |
1196 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1197 | return; | |
1198 | if (status == -EACCES) { | |
1199 | rpc_exit(task, -EACCES); | |
1200 | return; | |
1201 | } | |
1202 | task->tk_action = call_refresh; | |
1203 | if (status != -ETIMEDOUT) | |
1204 | rpc_delay(task, 3*HZ); | |
1205 | return; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * Call header serialization | |
1210 | */ | |
d8ed029d | 1211 | static __be32 * |
1da177e4 LT |
1212 | call_header(struct rpc_task *task) |
1213 | { | |
1214 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1215 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1216 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1217 | |
1218 | /* FIXME: check buffer size? */ | |
808012fb CL |
1219 | |
1220 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1221 | *p++ = req->rq_xid; /* XID */ |
1222 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1223 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1224 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1225 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1226 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1227 | p = rpcauth_marshcred(task, p); |
1228 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1229 | return p; | |
1da177e4 LT |
1230 | } |
1231 | ||
1232 | /* | |
1233 | * Reply header verification | |
1234 | */ | |
d8ed029d | 1235 | static __be32 * |
1da177e4 LT |
1236 | call_verify(struct rpc_task *task) |
1237 | { | |
1238 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1239 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1240 | __be32 *p = iov->iov_base; |
1241 | u32 n; | |
1da177e4 LT |
1242 | int error = -EACCES; |
1243 | ||
e8896495 DH |
1244 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1245 | /* RFC-1014 says that the representation of XDR data must be a | |
1246 | * multiple of four bytes | |
1247 | * - if it isn't pointer subtraction in the NFS client may give | |
1248 | * undefined results | |
1249 | */ | |
1250 | printk(KERN_WARNING | |
1251 | "call_verify: XDR representation not a multiple of" | |
1252 | " 4 bytes: 0x%x\n", task->tk_rqstp->rq_rcv_buf.len); | |
1253 | goto out_eio; | |
1254 | } | |
1da177e4 LT |
1255 | if ((len -= 3) < 0) |
1256 | goto out_overflow; | |
1257 | p += 1; /* skip XID */ | |
1258 | ||
1259 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
1260 | printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); | |
abbcf28f | 1261 | goto out_garbage; |
1da177e4 LT |
1262 | } |
1263 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1264 | if (--len < 0) | |
1265 | goto out_overflow; | |
1266 | switch ((n = ntohl(*p++))) { | |
1267 | case RPC_AUTH_ERROR: | |
1268 | break; | |
1269 | case RPC_MISMATCH: | |
cdf47706 AG |
1270 | dprintk("%s: RPC call version mismatch!\n", __FUNCTION__); |
1271 | error = -EPROTONOSUPPORT; | |
1272 | goto out_err; | |
1da177e4 | 1273 | default: |
cdf47706 | 1274 | dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n); |
1da177e4 LT |
1275 | goto out_eio; |
1276 | } | |
1277 | if (--len < 0) | |
1278 | goto out_overflow; | |
1279 | switch ((n = ntohl(*p++))) { | |
1280 | case RPC_AUTH_REJECTEDCRED: | |
1281 | case RPC_AUTH_REJECTEDVERF: | |
1282 | case RPCSEC_GSS_CREDPROBLEM: | |
1283 | case RPCSEC_GSS_CTXPROBLEM: | |
1284 | if (!task->tk_cred_retry) | |
1285 | break; | |
1286 | task->tk_cred_retry--; | |
1287 | dprintk("RPC: %4d call_verify: retry stale creds\n", | |
1288 | task->tk_pid); | |
1289 | rpcauth_invalcred(task); | |
1290 | task->tk_action = call_refresh; | |
abbcf28f | 1291 | goto out_retry; |
1da177e4 LT |
1292 | case RPC_AUTH_BADCRED: |
1293 | case RPC_AUTH_BADVERF: | |
1294 | /* possibly garbled cred/verf? */ | |
1295 | if (!task->tk_garb_retry) | |
1296 | break; | |
1297 | task->tk_garb_retry--; | |
1298 | dprintk("RPC: %4d call_verify: retry garbled creds\n", | |
1299 | task->tk_pid); | |
1300 | task->tk_action = call_bind; | |
abbcf28f | 1301 | goto out_retry; |
1da177e4 | 1302 | case RPC_AUTH_TOOWEAK: |
1356b8c2 LS |
1303 | printk(KERN_NOTICE "call_verify: server %s requires stronger " |
1304 | "authentication.\n", task->tk_client->cl_server); | |
1da177e4 LT |
1305 | break; |
1306 | default: | |
1307 | printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); | |
1308 | error = -EIO; | |
1309 | } | |
1310 | dprintk("RPC: %4d call_verify: call rejected %d\n", | |
1311 | task->tk_pid, n); | |
1312 | goto out_err; | |
1313 | } | |
1314 | if (!(p = rpcauth_checkverf(task, p))) { | |
1315 | printk(KERN_WARNING "call_verify: auth check failed\n"); | |
abbcf28f | 1316 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1317 | } |
d8ed029d | 1318 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1319 | if (len < 0) |
1320 | goto out_overflow; | |
1321 | switch ((n = ntohl(*p++))) { | |
1322 | case RPC_SUCCESS: | |
1323 | return p; | |
1324 | case RPC_PROG_UNAVAIL: | |
cdf47706 | 1325 | dprintk("RPC: call_verify: program %u is unsupported by server %s\n", |
1da177e4 LT |
1326 | (unsigned int)task->tk_client->cl_prog, |
1327 | task->tk_client->cl_server); | |
cdf47706 AG |
1328 | error = -EPFNOSUPPORT; |
1329 | goto out_err; | |
1da177e4 | 1330 | case RPC_PROG_MISMATCH: |
cdf47706 | 1331 | dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n", |
1da177e4 LT |
1332 | (unsigned int)task->tk_client->cl_prog, |
1333 | (unsigned int)task->tk_client->cl_vers, | |
1334 | task->tk_client->cl_server); | |
cdf47706 AG |
1335 | error = -EPROTONOSUPPORT; |
1336 | goto out_err; | |
1da177e4 | 1337 | case RPC_PROC_UNAVAIL: |
cdf47706 | 1338 | dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n", |
1da177e4 LT |
1339 | task->tk_msg.rpc_proc, |
1340 | task->tk_client->cl_prog, | |
1341 | task->tk_client->cl_vers, | |
1342 | task->tk_client->cl_server); | |
cdf47706 AG |
1343 | error = -EOPNOTSUPP; |
1344 | goto out_err; | |
1da177e4 LT |
1345 | case RPC_GARBAGE_ARGS: |
1346 | dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__); | |
1347 | break; /* retry */ | |
1348 | default: | |
1349 | printk(KERN_WARNING "call_verify: server accept status: %x\n", n); | |
1350 | /* Also retry */ | |
1351 | } | |
1352 | ||
abbcf28f | 1353 | out_garbage: |
1da177e4 LT |
1354 | task->tk_client->cl_stats->rpcgarbage++; |
1355 | if (task->tk_garb_retry) { | |
1356 | task->tk_garb_retry--; | |
cdf47706 | 1357 | dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid); |
1da177e4 | 1358 | task->tk_action = call_bind; |
abbcf28f TM |
1359 | out_retry: |
1360 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
1361 | } |
1362 | printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); | |
1363 | out_eio: | |
1364 | error = -EIO; | |
1365 | out_err: | |
1366 | rpc_exit(task, error); | |
abbcf28f | 1367 | return ERR_PTR(error); |
1da177e4 LT |
1368 | out_overflow: |
1369 | printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); | |
abbcf28f | 1370 | goto out_garbage; |
1da177e4 | 1371 | } |
5ee0ed7d | 1372 | |
d8ed029d | 1373 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1374 | { |
1375 | return 0; | |
1376 | } | |
1377 | ||
d8ed029d | 1378 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1379 | { |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | static struct rpc_procinfo rpcproc_null = { | |
1384 | .p_encode = rpcproc_encode_null, | |
1385 | .p_decode = rpcproc_decode_null, | |
1386 | }; | |
1387 | ||
1388 | int rpc_ping(struct rpc_clnt *clnt, int flags) | |
1389 | { | |
1390 | struct rpc_message msg = { | |
1391 | .rpc_proc = &rpcproc_null, | |
1392 | }; | |
1393 | int err; | |
1394 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1395 | err = rpc_call_sync(clnt, &msg, flags); | |
1396 | put_rpccred(msg.rpc_cred); | |
1397 | return err; | |
1398 | } |