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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> | |
6d5fcb5a | 30 | #include <linux/smp_lock.h> |
1da177e4 | 31 | #include <linux/utsname.h> |
11c556b3 | 32 | #include <linux/workqueue.h> |
1da177e4 LT |
33 | |
34 | #include <linux/sunrpc/clnt.h> | |
1da177e4 | 35 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 36 | #include <linux/sunrpc/metrics.h> |
1da177e4 LT |
37 | |
38 | ||
1da177e4 LT |
39 | #ifdef RPC_DEBUG |
40 | # define RPCDBG_FACILITY RPCDBG_CALL | |
41 | #endif | |
42 | ||
46121cf7 CL |
43 | #define dprint_status(t) \ |
44 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
45 | __FUNCTION__, t->tk_status) | |
46 | ||
1da177e4 LT |
47 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
48 | ||
49 | ||
50 | static void call_start(struct rpc_task *task); | |
51 | static void call_reserve(struct rpc_task *task); | |
52 | static void call_reserveresult(struct rpc_task *task); | |
53 | static void call_allocate(struct rpc_task *task); | |
54 | static void call_encode(struct rpc_task *task); | |
55 | static void call_decode(struct rpc_task *task); | |
56 | static void call_bind(struct rpc_task *task); | |
da351878 | 57 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
58 | static void call_transmit(struct rpc_task *task); |
59 | static void call_status(struct rpc_task *task); | |
940e3318 | 60 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
61 | static void call_refresh(struct rpc_task *task); |
62 | static void call_refreshresult(struct rpc_task *task); | |
63 | static void call_timeout(struct rpc_task *task); | |
64 | static void call_connect(struct rpc_task *task); | |
65 | static void call_connect_status(struct rpc_task *task); | |
d8ed029d AD |
66 | static __be32 * call_header(struct rpc_task *task); |
67 | static __be32 * call_verify(struct rpc_task *task); | |
1da177e4 LT |
68 | |
69 | ||
70 | static int | |
71 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
72 | { | |
f134585a | 73 | static uint32_t clntid; |
1da177e4 LT |
74 | int error; |
75 | ||
54281548 TM |
76 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
77 | clnt->cl_dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
78 | if (dir_name == NULL) |
79 | return 0; | |
54281548 TM |
80 | |
81 | clnt->cl_vfsmnt = rpc_get_mount(); | |
82 | if (IS_ERR(clnt->cl_vfsmnt)) | |
83 | return PTR_ERR(clnt->cl_vfsmnt); | |
84 | ||
f134585a TM |
85 | for (;;) { |
86 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
87 | "%s/clnt%x", dir_name, | |
88 | (unsigned int)clntid++); | |
89 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
90 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
91 | if (!IS_ERR(clnt->cl_dentry)) | |
92 | return 0; | |
1da177e4 | 93 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
94 | if (error != -EEXIST) { |
95 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
96 | clnt->cl_pathname, error); | |
54281548 | 97 | rpc_put_mount(); |
f134585a TM |
98 | return error; |
99 | } | |
1da177e4 LT |
100 | } |
101 | } | |
102 | ||
ff9aa5e5 | 103 | 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 |
104 | { |
105 | struct rpc_version *version; | |
106 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 107 | struct rpc_auth *auth; |
1da177e4 LT |
108 | int err; |
109 | int len; | |
110 | ||
46121cf7 CL |
111 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
112 | program->name, servname, xprt); | |
1da177e4 LT |
113 | |
114 | err = -EINVAL; | |
115 | if (!xprt) | |
712917d1 | 116 | goto out_no_xprt; |
1da177e4 LT |
117 | if (vers >= program->nrvers || !(version = program->version[vers])) |
118 | goto out_err; | |
119 | ||
120 | err = -ENOMEM; | |
0da974f4 | 121 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
122 | if (!clnt) |
123 | goto out_err; | |
1da177e4 LT |
124 | atomic_set(&clnt->cl_users, 0); |
125 | atomic_set(&clnt->cl_count, 1); | |
126 | clnt->cl_parent = clnt; | |
127 | ||
128 | clnt->cl_server = clnt->cl_inline_name; | |
129 | len = strlen(servname) + 1; | |
130 | if (len > sizeof(clnt->cl_inline_name)) { | |
131 | char *buf = kmalloc(len, GFP_KERNEL); | |
132 | if (buf != 0) | |
133 | clnt->cl_server = buf; | |
134 | else | |
135 | len = sizeof(clnt->cl_inline_name); | |
136 | } | |
137 | strlcpy(clnt->cl_server, servname, len); | |
138 | ||
139 | clnt->cl_xprt = xprt; | |
140 | clnt->cl_procinfo = version->procs; | |
141 | clnt->cl_maxproc = version->nrprocs; | |
142 | clnt->cl_protname = program->name; | |
1da177e4 LT |
143 | clnt->cl_prog = program->number; |
144 | clnt->cl_vers = version->number; | |
1da177e4 | 145 | clnt->cl_stats = program->stats; |
11c556b3 | 146 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
147 | err = -ENOMEM; |
148 | if (clnt->cl_metrics == NULL) | |
149 | goto out_no_stats; | |
3e32a5d9 | 150 | clnt->cl_program = program; |
1da177e4 | 151 | |
ec739ef0 | 152 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
153 | clnt->cl_autobind = 1; |
154 | ||
155 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
156 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
157 | ||
158 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); | |
159 | if (err < 0) | |
160 | goto out_no_path; | |
161 | ||
6a19275a BF |
162 | auth = rpcauth_create(flavor, clnt); |
163 | if (IS_ERR(auth)) { | |
1da177e4 LT |
164 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
165 | flavor); | |
6a19275a | 166 | err = PTR_ERR(auth); |
1da177e4 LT |
167 | goto out_no_auth; |
168 | } | |
169 | ||
170 | /* save the nodename */ | |
e9ff3990 | 171 | clnt->cl_nodelen = strlen(utsname()->nodename); |
1da177e4 LT |
172 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
173 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
e9ff3990 | 174 | memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen); |
1da177e4 LT |
175 | return clnt; |
176 | ||
177 | out_no_auth: | |
54281548 | 178 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 179 | rpc_rmdir(clnt->cl_dentry); |
54281548 TM |
180 | rpc_put_mount(); |
181 | } | |
1da177e4 | 182 | out_no_path: |
23bf85ba TM |
183 | rpc_free_iostats(clnt->cl_metrics); |
184 | out_no_stats: | |
1da177e4 LT |
185 | if (clnt->cl_server != clnt->cl_inline_name) |
186 | kfree(clnt->cl_server); | |
187 | kfree(clnt); | |
188 | out_err: | |
6b6ca86b | 189 | xprt_put(xprt); |
712917d1 | 190 | out_no_xprt: |
1da177e4 LT |
191 | return ERR_PTR(err); |
192 | } | |
193 | ||
c2866763 CL |
194 | /* |
195 | * rpc_create - create an RPC client and transport with one call | |
196 | * @args: rpc_clnt create argument structure | |
197 | * | |
198 | * Creates and initializes an RPC transport and an RPC client. | |
199 | * | |
200 | * It can ping the server in order to determine if it is up, and to see if | |
201 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
202 | * this behavior so asynchronous tasks can also use rpc_create. | |
203 | */ | |
204 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
205 | { | |
206 | struct rpc_xprt *xprt; | |
207 | struct rpc_clnt *clnt; | |
208 | ||
209 | xprt = xprt_create_transport(args->protocol, args->address, | |
210 | args->addrsize, args->timeout); | |
211 | if (IS_ERR(xprt)) | |
212 | return (struct rpc_clnt *)xprt; | |
213 | ||
214 | /* | |
215 | * By default, kernel RPC client connects from a reserved port. | |
216 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
217 | * but it is always enabled for rpciod, which handles the connect | |
218 | * operation. | |
219 | */ | |
220 | xprt->resvport = 1; | |
221 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
222 | xprt->resvport = 0; | |
223 | ||
224 | dprintk("RPC: creating %s client for %s (xprt %p)\n", | |
46121cf7 | 225 | args->program->name, args->servername, xprt); |
c2866763 CL |
226 | |
227 | clnt = rpc_new_client(xprt, args->servername, args->program, | |
228 | args->version, args->authflavor); | |
229 | if (IS_ERR(clnt)) | |
230 | return clnt; | |
231 | ||
232 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
233 | int err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
234 | if (err != 0) { | |
235 | rpc_shutdown_client(clnt); | |
236 | return ERR_PTR(err); | |
237 | } | |
238 | } | |
239 | ||
240 | clnt->cl_softrtry = 1; | |
241 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
242 | clnt->cl_softrtry = 0; | |
243 | ||
244 | if (args->flags & RPC_CLNT_CREATE_INTR) | |
245 | clnt->cl_intr = 1; | |
246 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
247 | clnt->cl_autobind = 1; | |
248 | if (args->flags & RPC_CLNT_CREATE_ONESHOT) | |
249 | clnt->cl_oneshot = 1; | |
43d78ef2 CL |
250 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
251 | clnt->cl_discrtry = 1; | |
c2866763 CL |
252 | |
253 | return clnt; | |
254 | } | |
b86acd50 | 255 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 256 | |
1da177e4 LT |
257 | /* |
258 | * This function clones the RPC client structure. It allows us to share the | |
259 | * same transport while varying parameters such as the authentication | |
260 | * flavour. | |
261 | */ | |
262 | struct rpc_clnt * | |
263 | rpc_clone_client(struct rpc_clnt *clnt) | |
264 | { | |
265 | struct rpc_clnt *new; | |
3e32a5d9 | 266 | int err = -ENOMEM; |
1da177e4 | 267 | |
e69062b4 | 268 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
269 | if (!new) |
270 | goto out_no_clnt; | |
1da177e4 LT |
271 | atomic_set(&new->cl_count, 1); |
272 | atomic_set(&new->cl_users, 0); | |
23bf85ba TM |
273 | new->cl_metrics = rpc_alloc_iostats(clnt); |
274 | if (new->cl_metrics == NULL) | |
275 | goto out_no_stats; | |
3e32a5d9 TM |
276 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
277 | if (err != 0) | |
278 | goto out_no_path; | |
1da177e4 LT |
279 | new->cl_parent = clnt; |
280 | atomic_inc(&clnt->cl_count); | |
6b6ca86b | 281 | new->cl_xprt = xprt_get(clnt->cl_xprt); |
1da177e4 LT |
282 | /* Turn off autobind on clones */ |
283 | new->cl_autobind = 0; | |
284 | new->cl_oneshot = 0; | |
285 | new->cl_dead = 0; | |
286 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); | |
287 | if (new->cl_auth) | |
288 | atomic_inc(&new->cl_auth->au_count); | |
289 | return new; | |
3e32a5d9 TM |
290 | out_no_path: |
291 | rpc_free_iostats(new->cl_metrics); | |
23bf85ba TM |
292 | out_no_stats: |
293 | kfree(new); | |
1da177e4 | 294 | out_no_clnt: |
46121cf7 | 295 | dprintk("RPC: %s: returned error %d\n", __FUNCTION__, err); |
3e32a5d9 | 296 | return ERR_PTR(err); |
1da177e4 LT |
297 | } |
298 | ||
299 | /* | |
300 | * Properly shut down an RPC client, terminating all outstanding | |
301 | * requests. Note that we must be certain that cl_oneshot and | |
302 | * cl_dead are cleared, or else the client would be destroyed | |
303 | * when the last task releases it. | |
304 | */ | |
305 | int | |
306 | rpc_shutdown_client(struct rpc_clnt *clnt) | |
307 | { | |
46121cf7 | 308 | dprintk("RPC: shutting down %s client for %s, tasks=%d\n", |
1da177e4 LT |
309 | clnt->cl_protname, clnt->cl_server, |
310 | atomic_read(&clnt->cl_users)); | |
311 | ||
312 | while (atomic_read(&clnt->cl_users) > 0) { | |
313 | /* Don't let rpc_release_client destroy us */ | |
314 | clnt->cl_oneshot = 0; | |
315 | clnt->cl_dead = 0; | |
316 | rpc_killall_tasks(clnt); | |
532347e2 | 317 | wait_event_timeout(destroy_wait, |
4f47707b | 318 | !atomic_read(&clnt->cl_users), 1*HZ); |
1da177e4 LT |
319 | } |
320 | ||
321 | if (atomic_read(&clnt->cl_users) < 0) { | |
322 | printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", | |
323 | clnt, atomic_read(&clnt->cl_users)); | |
324 | #ifdef RPC_DEBUG | |
325 | rpc_show_tasks(); | |
326 | #endif | |
327 | BUG(); | |
328 | } | |
329 | ||
330 | return rpc_destroy_client(clnt); | |
331 | } | |
332 | ||
333 | /* | |
334 | * Delete an RPC client | |
335 | */ | |
336 | int | |
337 | rpc_destroy_client(struct rpc_clnt *clnt) | |
338 | { | |
339 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
340 | return 1; | |
341 | BUG_ON(atomic_read(&clnt->cl_users) != 0); | |
342 | ||
46121cf7 | 343 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 LT |
344 | clnt->cl_protname, clnt->cl_server); |
345 | if (clnt->cl_auth) { | |
346 | rpcauth_destroy(clnt->cl_auth); | |
347 | clnt->cl_auth = NULL; | |
348 | } | |
8f8e7a50 | 349 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 350 | rpc_rmdir(clnt->cl_dentry); |
8f8e7a50 TM |
351 | rpc_put_mount(); |
352 | } | |
3e32a5d9 TM |
353 | if (clnt->cl_parent != clnt) { |
354 | rpc_destroy_client(clnt->cl_parent); | |
355 | goto out_free; | |
356 | } | |
1da177e4 LT |
357 | if (clnt->cl_server != clnt->cl_inline_name) |
358 | kfree(clnt->cl_server); | |
359 | out_free: | |
11c556b3 CL |
360 | rpc_free_iostats(clnt->cl_metrics); |
361 | clnt->cl_metrics = NULL; | |
6b6ca86b | 362 | xprt_put(clnt->cl_xprt); |
1da177e4 LT |
363 | kfree(clnt); |
364 | return 0; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Release an RPC client | |
369 | */ | |
370 | void | |
371 | rpc_release_client(struct rpc_clnt *clnt) | |
372 | { | |
46121cf7 CL |
373 | dprintk("RPC: rpc_release_client(%p, %d)\n", |
374 | clnt, atomic_read(&clnt->cl_users)); | |
1da177e4 LT |
375 | |
376 | if (!atomic_dec_and_test(&clnt->cl_users)) | |
377 | return; | |
378 | wake_up(&destroy_wait); | |
379 | if (clnt->cl_oneshot || clnt->cl_dead) | |
380 | rpc_destroy_client(clnt); | |
381 | } | |
382 | ||
007e251f AG |
383 | /** |
384 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
385 | * @old - old rpc_client | |
386 | * @program - rpc program to set | |
387 | * @vers - rpc program version | |
388 | * | |
389 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
390 | * of use for enabling different RPC programs to share the same transport. | |
391 | * The Sun NFSv2/v3 ACL protocol can do this. | |
392 | */ | |
393 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
394 | struct rpc_program *program, | |
395 | int vers) | |
396 | { | |
397 | struct rpc_clnt *clnt; | |
398 | struct rpc_version *version; | |
399 | int err; | |
400 | ||
401 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
402 | version = program->version[vers]; | |
403 | clnt = rpc_clone_client(old); | |
404 | if (IS_ERR(clnt)) | |
405 | goto out; | |
406 | clnt->cl_procinfo = version->procs; | |
407 | clnt->cl_maxproc = version->nrprocs; | |
408 | clnt->cl_protname = program->name; | |
409 | clnt->cl_prog = program->number; | |
410 | clnt->cl_vers = version->number; | |
411 | clnt->cl_stats = program->stats; | |
412 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
413 | if (err != 0) { | |
414 | rpc_shutdown_client(clnt); | |
415 | clnt = ERR_PTR(err); | |
416 | } | |
cca5172a | 417 | out: |
007e251f AG |
418 | return clnt; |
419 | } | |
420 | ||
1da177e4 LT |
421 | /* |
422 | * Default callback for async RPC calls | |
423 | */ | |
424 | static void | |
963d8fe5 | 425 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
426 | { |
427 | } | |
428 | ||
963d8fe5 TM |
429 | static const struct rpc_call_ops rpc_default_ops = { |
430 | .rpc_call_done = rpc_default_callback, | |
431 | }; | |
432 | ||
1da177e4 | 433 | /* |
14b218a8 | 434 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
435 | * sleeps on RPC calls |
436 | */ | |
2bd61579 | 437 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
cca5172a | 438 | |
14b218a8 TM |
439 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
440 | { | |
2bd61579 | 441 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
442 | sigset_t sigmask; |
443 | ||
444 | /* Block all signals except those listed in sigallow */ | |
445 | if (intr) | |
446 | sigallow |= RPC_INTR_SIGNALS; | |
447 | siginitsetinv(&sigmask, sigallow); | |
448 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
449 | } | |
450 | ||
451 | static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) | |
452 | { | |
453 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
454 | } | |
455 | ||
456 | static inline void rpc_restore_sigmask(sigset_t *oldset) | |
457 | { | |
458 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
459 | } | |
460 | ||
1da177e4 LT |
461 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
462 | { | |
14b218a8 | 463 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 LT |
464 | } |
465 | ||
466 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
467 | { | |
14b218a8 | 468 | rpc_restore_sigmask(oldset); |
1da177e4 LT |
469 | } |
470 | ||
471 | /* | |
472 | * New rpc_call implementation | |
473 | */ | |
474 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
475 | { | |
476 | struct rpc_task *task; | |
477 | sigset_t oldset; | |
478 | int status; | |
479 | ||
480 | /* If this client is slain all further I/O fails */ | |
cca5172a | 481 | if (clnt->cl_dead) |
1da177e4 LT |
482 | return -EIO; |
483 | ||
484 | BUG_ON(flags & RPC_TASK_ASYNC); | |
485 | ||
963d8fe5 | 486 | task = rpc_new_task(clnt, flags, &rpc_default_ops, NULL); |
1da177e4 | 487 | if (task == NULL) |
e6b3c4db | 488 | return -ENOMEM; |
1da177e4 | 489 | |
14b218a8 TM |
490 | /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ |
491 | rpc_task_sigmask(task, &oldset); | |
492 | ||
1da177e4 | 493 | /* Set up the call info struct and execute the task */ |
2efef837 TM |
494 | rpc_call_setup(task, msg, 0); |
495 | if (task->tk_status == 0) { | |
496 | atomic_inc(&task->tk_count); | |
497 | rpc_execute(task); | |
498 | } | |
e60859ac | 499 | status = task->tk_status; |
bde8f00c | 500 | rpc_put_task(task); |
e6b3c4db | 501 | rpc_restore_sigmask(&oldset); |
1da177e4 LT |
502 | return status; |
503 | } | |
504 | ||
505 | /* | |
506 | * New rpc_call implementation | |
507 | */ | |
508 | int | |
509 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 510 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
511 | { |
512 | struct rpc_task *task; | |
513 | sigset_t oldset; | |
514 | int status; | |
515 | ||
516 | /* If this client is slain all further I/O fails */ | |
7a1218a2 | 517 | status = -EIO; |
cca5172a | 518 | if (clnt->cl_dead) |
7a1218a2 | 519 | goto out_release; |
1da177e4 LT |
520 | |
521 | flags |= RPC_TASK_ASYNC; | |
522 | ||
1da177e4 | 523 | /* Create/initialize a new RPC task */ |
1da177e4 | 524 | status = -ENOMEM; |
963d8fe5 | 525 | if (!(task = rpc_new_task(clnt, flags, tk_ops, data))) |
7a1218a2 | 526 | goto out_release; |
1da177e4 | 527 | |
14b218a8 | 528 | /* Mask signals on GSS_AUTH upcalls */ |
cca5172a | 529 | rpc_task_sigmask(task, &oldset); |
14b218a8 | 530 | |
1da177e4 LT |
531 | rpc_call_setup(task, msg, 0); |
532 | ||
533 | /* Set up the call info struct and execute the task */ | |
534 | status = task->tk_status; | |
535 | if (status == 0) | |
536 | rpc_execute(task); | |
537 | else | |
bde8f00c | 538 | rpc_put_task(task); |
1da177e4 | 539 | |
cca5172a | 540 | rpc_restore_sigmask(&oldset); |
7a1218a2 TM |
541 | return status; |
542 | out_release: | |
bbd5a1f9 | 543 | rpc_release_calldata(tk_ops, data); |
1da177e4 LT |
544 | return status; |
545 | } | |
546 | ||
547 | ||
548 | void | |
549 | rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) | |
550 | { | |
551 | task->tk_msg = *msg; | |
552 | task->tk_flags |= flags; | |
553 | /* Bind the user cred */ | |
554 | if (task->tk_msg.rpc_cred != NULL) | |
555 | rpcauth_holdcred(task); | |
556 | else | |
557 | rpcauth_bindcred(task); | |
558 | ||
559 | if (task->tk_status == 0) | |
560 | task->tk_action = call_start; | |
561 | else | |
abbcf28f | 562 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
563 | } |
564 | ||
ed39440a CL |
565 | /** |
566 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
567 | * @clnt: RPC client structure | |
568 | * @buf: target buffer | |
569 | * @size: length of target buffer | |
570 | * | |
571 | * Returns the number of bytes that are actually in the stored address. | |
572 | */ | |
573 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
574 | { | |
575 | size_t bytes; | |
576 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
577 | ||
578 | bytes = sizeof(xprt->addr); | |
579 | if (bytes > bufsize) | |
580 | bytes = bufsize; | |
581 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 582 | return xprt->addrlen; |
ed39440a | 583 | } |
b86acd50 | 584 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 585 | |
f425eba4 CL |
586 | /** |
587 | * rpc_peeraddr2str - return remote peer address in printable format | |
588 | * @clnt: RPC client structure | |
589 | * @format: address format | |
590 | * | |
591 | */ | |
592 | char *rpc_peeraddr2str(struct rpc_clnt *clnt, enum rpc_display_format_t format) | |
593 | { | |
594 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
595 | |
596 | if (xprt->address_strings[format] != NULL) | |
597 | return xprt->address_strings[format]; | |
598 | else | |
599 | return "unprintable"; | |
f425eba4 | 600 | } |
b86acd50 | 601 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 602 | |
1da177e4 LT |
603 | void |
604 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
605 | { | |
606 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
607 | if (xprt->ops->set_buffer_size) |
608 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 LT |
609 | } |
610 | ||
611 | /* | |
612 | * Return size of largest payload RPC client can support, in bytes | |
613 | * | |
614 | * For stream transports, this is one RPC record fragment (see RFC | |
615 | * 1831), as we don't support multi-record requests yet. For datagram | |
616 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
617 | * RPC header sizes. | |
618 | */ | |
619 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
620 | { | |
621 | return clnt->cl_xprt->max_payload; | |
622 | } | |
b86acd50 | 623 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 624 | |
35f5a422 CL |
625 | /** |
626 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
627 | * @clnt: client to rebind | |
628 | * | |
629 | */ | |
630 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
631 | { | |
632 | if (clnt->cl_autobind) | |
ec739ef0 | 633 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 634 | } |
b86acd50 | 635 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 636 | |
1da177e4 LT |
637 | /* |
638 | * Restart an (async) RPC call. Usually called from within the | |
639 | * exit handler. | |
640 | */ | |
641 | void | |
642 | rpc_restart_call(struct rpc_task *task) | |
643 | { | |
644 | if (RPC_ASSASSINATED(task)) | |
645 | return; | |
646 | ||
647 | task->tk_action = call_start; | |
648 | } | |
649 | ||
650 | /* | |
651 | * 0. Initial state | |
652 | * | |
653 | * Other FSM states can be visited zero or more times, but | |
654 | * this state is visited exactly once for each RPC. | |
655 | */ | |
656 | static void | |
657 | call_start(struct rpc_task *task) | |
658 | { | |
659 | struct rpc_clnt *clnt = task->tk_client; | |
660 | ||
46121cf7 CL |
661 | dprintk("RPC: %5u call_start %s%d proc %d (%s)\n", task->tk_pid, |
662 | clnt->cl_protname, clnt->cl_vers, | |
663 | task->tk_msg.rpc_proc->p_proc, | |
664 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
1da177e4 LT |
665 | |
666 | /* Increment call count */ | |
667 | task->tk_msg.rpc_proc->p_count++; | |
668 | clnt->cl_stats->rpccnt++; | |
669 | task->tk_action = call_reserve; | |
670 | } | |
671 | ||
672 | /* | |
673 | * 1. Reserve an RPC call slot | |
674 | */ | |
675 | static void | |
676 | call_reserve(struct rpc_task *task) | |
677 | { | |
46121cf7 | 678 | dprint_status(task); |
1da177e4 LT |
679 | |
680 | if (!rpcauth_uptodatecred(task)) { | |
681 | task->tk_action = call_refresh; | |
682 | return; | |
683 | } | |
684 | ||
685 | task->tk_status = 0; | |
686 | task->tk_action = call_reserveresult; | |
687 | xprt_reserve(task); | |
688 | } | |
689 | ||
690 | /* | |
691 | * 1b. Grok the result of xprt_reserve() | |
692 | */ | |
693 | static void | |
694 | call_reserveresult(struct rpc_task *task) | |
695 | { | |
696 | int status = task->tk_status; | |
697 | ||
46121cf7 | 698 | dprint_status(task); |
1da177e4 LT |
699 | |
700 | /* | |
701 | * After a call to xprt_reserve(), we must have either | |
702 | * a request slot or else an error status. | |
703 | */ | |
704 | task->tk_status = 0; | |
705 | if (status >= 0) { | |
706 | if (task->tk_rqstp) { | |
707 | task->tk_action = call_allocate; | |
708 | return; | |
709 | } | |
710 | ||
711 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
712 | __FUNCTION__, status); | |
713 | rpc_exit(task, -EIO); | |
714 | return; | |
715 | } | |
716 | ||
717 | /* | |
718 | * Even though there was an error, we may have acquired | |
719 | * a request slot somehow. Make sure not to leak it. | |
720 | */ | |
721 | if (task->tk_rqstp) { | |
722 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
723 | __FUNCTION__, status); | |
724 | xprt_release(task); | |
725 | } | |
726 | ||
727 | switch (status) { | |
728 | case -EAGAIN: /* woken up; retry */ | |
729 | task->tk_action = call_reserve; | |
730 | return; | |
731 | case -EIO: /* probably a shutdown */ | |
732 | break; | |
733 | default: | |
734 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
735 | __FUNCTION__, status); | |
736 | break; | |
737 | } | |
738 | rpc_exit(task, status); | |
739 | } | |
740 | ||
741 | /* | |
742 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 743 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
744 | */ |
745 | static void | |
746 | call_allocate(struct rpc_task *task) | |
747 | { | |
2bea90d4 | 748 | unsigned int slack = task->tk_auth->au_cslack; |
02107148 CL |
749 | struct rpc_rqst *req = task->tk_rqstp; |
750 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 751 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 752 | |
46121cf7 CL |
753 | dprint_status(task); |
754 | ||
2bea90d4 | 755 | task->tk_status = 0; |
1da177e4 | 756 | task->tk_action = call_bind; |
2bea90d4 | 757 | |
02107148 | 758 | if (req->rq_buffer) |
1da177e4 LT |
759 | return; |
760 | ||
2bea90d4 CL |
761 | if (proc->p_proc != 0) { |
762 | BUG_ON(proc->p_arglen == 0); | |
763 | if (proc->p_decode != NULL) | |
764 | BUG_ON(proc->p_replen == 0); | |
765 | } | |
1da177e4 | 766 | |
2bea90d4 CL |
767 | /* |
768 | * Calculate the size (in quads) of the RPC call | |
769 | * and reply headers, and convert both values | |
770 | * to byte sizes. | |
771 | */ | |
772 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
773 | req->rq_callsize <<= 2; | |
774 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
775 | req->rq_rcvsize <<= 2; | |
776 | ||
777 | xprt->ops->buf_alloc(task, req->rq_callsize + req->rq_rcvsize); | |
778 | if (req->rq_buffer != NULL) | |
1da177e4 | 779 | return; |
46121cf7 CL |
780 | |
781 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 782 | |
14b218a8 | 783 | if (RPC_IS_ASYNC(task) || !signalled()) { |
1da177e4 LT |
784 | xprt_release(task); |
785 | task->tk_action = call_reserve; | |
786 | rpc_delay(task, HZ>>4); | |
787 | return; | |
788 | } | |
789 | ||
790 | rpc_exit(task, -ERESTARTSYS); | |
791 | } | |
792 | ||
940e3318 TM |
793 | static inline int |
794 | rpc_task_need_encode(struct rpc_task *task) | |
795 | { | |
796 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
797 | } | |
798 | ||
799 | static inline void | |
800 | rpc_task_force_reencode(struct rpc_task *task) | |
801 | { | |
802 | task->tk_rqstp->rq_snd_buf.len = 0; | |
803 | } | |
804 | ||
2bea90d4 CL |
805 | static inline void |
806 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
807 | { | |
808 | buf->head[0].iov_base = start; | |
809 | buf->head[0].iov_len = len; | |
810 | buf->tail[0].iov_len = 0; | |
811 | buf->page_len = 0; | |
812 | buf->len = 0; | |
813 | buf->buflen = len; | |
814 | } | |
815 | ||
1da177e4 LT |
816 | /* |
817 | * 3. Encode arguments of an RPC call | |
818 | */ | |
819 | static void | |
820 | call_encode(struct rpc_task *task) | |
821 | { | |
1da177e4 | 822 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 823 | kxdrproc_t encode; |
d8ed029d | 824 | __be32 *p; |
1da177e4 | 825 | |
46121cf7 | 826 | dprint_status(task); |
1da177e4 | 827 | |
2bea90d4 CL |
828 | rpc_xdr_buf_init(&req->rq_snd_buf, |
829 | req->rq_buffer, | |
830 | req->rq_callsize); | |
831 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
832 | (char *)req->rq_buffer + req->rq_callsize, | |
833 | req->rq_rcvsize); | |
1da177e4 LT |
834 | |
835 | /* Encode header and provided arguments */ | |
836 | encode = task->tk_msg.rpc_proc->p_encode; | |
837 | if (!(p = call_header(task))) { | |
838 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
839 | rpc_exit(task, -EIO); | |
840 | return; | |
841 | } | |
f3680312 BF |
842 | if (encode == NULL) |
843 | return; | |
844 | ||
6d5fcb5a | 845 | lock_kernel(); |
f3680312 BF |
846 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, |
847 | task->tk_msg.rpc_argp); | |
6d5fcb5a | 848 | unlock_kernel(); |
f3680312 BF |
849 | if (task->tk_status == -ENOMEM) { |
850 | /* XXX: Is this sane? */ | |
851 | rpc_delay(task, 3*HZ); | |
852 | task->tk_status = -EAGAIN; | |
853 | } | |
1da177e4 LT |
854 | } |
855 | ||
856 | /* | |
857 | * 4. Get the server port number if not yet set | |
858 | */ | |
859 | static void | |
860 | call_bind(struct rpc_task *task) | |
861 | { | |
ec739ef0 | 862 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 863 | |
46121cf7 | 864 | dprint_status(task); |
1da177e4 | 865 | |
da351878 | 866 | task->tk_action = call_connect; |
ec739ef0 | 867 | if (!xprt_bound(xprt)) { |
da351878 | 868 | task->tk_action = call_bind_status; |
ec739ef0 | 869 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 870 | xprt->ops->rpcbind(task); |
1da177e4 LT |
871 | } |
872 | } | |
873 | ||
874 | /* | |
da351878 CL |
875 | * 4a. Sort out bind result |
876 | */ | |
877 | static void | |
878 | call_bind_status(struct rpc_task *task) | |
879 | { | |
880 | int status = -EACCES; | |
881 | ||
882 | if (task->tk_status >= 0) { | |
46121cf7 | 883 | dprint_status(task); |
da351878 CL |
884 | task->tk_status = 0; |
885 | task->tk_action = call_connect; | |
886 | return; | |
887 | } | |
888 | ||
889 | switch (task->tk_status) { | |
890 | case -EACCES: | |
46121cf7 CL |
891 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
892 | "unavailable\n", task->tk_pid); | |
ea635a51 | 893 | rpc_delay(task, 3*HZ); |
da45828e | 894 | goto retry_timeout; |
da351878 | 895 | case -ETIMEDOUT: |
46121cf7 | 896 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 897 | task->tk_pid); |
da45828e | 898 | goto retry_timeout; |
da351878 | 899 | case -EPFNOSUPPORT: |
46121cf7 | 900 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
da351878 CL |
901 | task->tk_pid); |
902 | break; | |
903 | case -EPROTONOSUPPORT: | |
46121cf7 | 904 | dprintk("RPC: %5u remote rpcbind version 2 unavailable\n", |
da351878 CL |
905 | task->tk_pid); |
906 | break; | |
907 | default: | |
46121cf7 | 908 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 CL |
909 | task->tk_pid, -task->tk_status); |
910 | status = -EIO; | |
da351878 CL |
911 | } |
912 | ||
913 | rpc_exit(task, status); | |
914 | return; | |
915 | ||
da45828e TM |
916 | retry_timeout: |
917 | task->tk_action = call_timeout; | |
da351878 CL |
918 | } |
919 | ||
920 | /* | |
921 | * 4b. Connect to the RPC server | |
1da177e4 LT |
922 | */ |
923 | static void | |
924 | call_connect(struct rpc_task *task) | |
925 | { | |
da351878 | 926 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 927 | |
46121cf7 | 928 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
929 | task->tk_pid, xprt, |
930 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 931 | |
da351878 CL |
932 | task->tk_action = call_transmit; |
933 | if (!xprt_connected(xprt)) { | |
934 | task->tk_action = call_connect_status; | |
935 | if (task->tk_status < 0) | |
936 | return; | |
937 | xprt_connect(task); | |
1da177e4 | 938 | } |
1da177e4 LT |
939 | } |
940 | ||
941 | /* | |
da351878 | 942 | * 4c. Sort out connect result |
1da177e4 LT |
943 | */ |
944 | static void | |
945 | call_connect_status(struct rpc_task *task) | |
946 | { | |
947 | struct rpc_clnt *clnt = task->tk_client; | |
948 | int status = task->tk_status; | |
949 | ||
46121cf7 | 950 | dprint_status(task); |
da351878 | 951 | |
1da177e4 LT |
952 | task->tk_status = 0; |
953 | if (status >= 0) { | |
954 | clnt->cl_stats->netreconn++; | |
955 | task->tk_action = call_transmit; | |
956 | return; | |
957 | } | |
958 | ||
da351878 | 959 | /* Something failed: remote service port may have changed */ |
35f5a422 | 960 | rpc_force_rebind(clnt); |
da351878 | 961 | |
1da177e4 LT |
962 | switch (status) { |
963 | case -ENOTCONN: | |
1da177e4 | 964 | case -EAGAIN: |
da351878 | 965 | task->tk_action = call_bind; |
da45828e TM |
966 | if (!RPC_IS_SOFT(task)) |
967 | return; | |
968 | /* if soft mounted, test if we've timed out */ | |
969 | case -ETIMEDOUT: | |
970 | task->tk_action = call_timeout; | |
971 | return; | |
1da177e4 | 972 | } |
da45828e | 973 | rpc_exit(task, -EIO); |
1da177e4 LT |
974 | } |
975 | ||
976 | /* | |
977 | * 5. Transmit the RPC request, and wait for reply | |
978 | */ | |
979 | static void | |
980 | call_transmit(struct rpc_task *task) | |
981 | { | |
46121cf7 | 982 | dprint_status(task); |
1da177e4 LT |
983 | |
984 | task->tk_action = call_status; | |
985 | if (task->tk_status < 0) | |
986 | return; | |
987 | task->tk_status = xprt_prepare_transmit(task); | |
988 | if (task->tk_status != 0) | |
989 | return; | |
e0ab53de | 990 | task->tk_action = call_transmit_status; |
1da177e4 | 991 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 992 | if (rpc_task_need_encode(task)) { |
e0ab53de | 993 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
1da177e4 | 994 | call_encode(task); |
5e5ce5be TM |
995 | /* Did the encode result in an error condition? */ |
996 | if (task->tk_status != 0) | |
e0ab53de | 997 | return; |
5e5ce5be | 998 | } |
1da177e4 LT |
999 | xprt_transmit(task); |
1000 | if (task->tk_status < 0) | |
1001 | return; | |
e0ab53de TM |
1002 | /* |
1003 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1004 | * in order to allow access to the socket to other RPC requests. | |
1005 | */ | |
1006 | call_transmit_status(task); | |
1007 | if (task->tk_msg.rpc_proc->p_decode != NULL) | |
1008 | return; | |
1009 | task->tk_action = rpc_exit_task; | |
1010 | rpc_wake_up_task(task); | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * 5a. Handle cleanup after a transmission | |
1015 | */ | |
1016 | static void | |
1017 | call_transmit_status(struct rpc_task *task) | |
1018 | { | |
1019 | task->tk_action = call_status; | |
1020 | /* | |
1021 | * Special case: if we've been waiting on the socket's write_space() | |
1022 | * callback, then don't call xprt_end_transmit(). | |
1023 | */ | |
1024 | if (task->tk_status == -EAGAIN) | |
1025 | return; | |
1026 | xprt_end_transmit(task); | |
940e3318 | 1027 | rpc_task_force_reencode(task); |
1da177e4 LT |
1028 | } |
1029 | ||
1030 | /* | |
1031 | * 6. Sort out the RPC call status | |
1032 | */ | |
1033 | static void | |
1034 | call_status(struct rpc_task *task) | |
1035 | { | |
1036 | struct rpc_clnt *clnt = task->tk_client; | |
1037 | struct rpc_rqst *req = task->tk_rqstp; | |
1038 | int status; | |
1039 | ||
1040 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
1041 | task->tk_status = req->rq_received; | |
1042 | ||
46121cf7 | 1043 | dprint_status(task); |
1da177e4 LT |
1044 | |
1045 | status = task->tk_status; | |
1046 | if (status >= 0) { | |
1047 | task->tk_action = call_decode; | |
1048 | return; | |
1049 | } | |
1050 | ||
1051 | task->tk_status = 0; | |
1052 | switch(status) { | |
76303992 TM |
1053 | case -EHOSTDOWN: |
1054 | case -EHOSTUNREACH: | |
1055 | case -ENETUNREACH: | |
1056 | /* | |
1057 | * Delay any retries for 3 seconds, then handle as if it | |
1058 | * were a timeout. | |
1059 | */ | |
1060 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1061 | case -ETIMEDOUT: |
1062 | task->tk_action = call_timeout; | |
241c39b9 TM |
1063 | if (task->tk_client->cl_discrtry) |
1064 | xprt_disconnect(task->tk_xprt); | |
1da177e4 LT |
1065 | break; |
1066 | case -ECONNREFUSED: | |
1067 | case -ENOTCONN: | |
35f5a422 | 1068 | rpc_force_rebind(clnt); |
1da177e4 LT |
1069 | task->tk_action = call_bind; |
1070 | break; | |
1071 | case -EAGAIN: | |
1072 | task->tk_action = call_transmit; | |
1073 | break; | |
1074 | case -EIO: | |
1075 | /* shutdown or soft timeout */ | |
1076 | rpc_exit(task, status); | |
1077 | break; | |
1078 | default: | |
f518e35a | 1079 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
1080 | clnt->cl_protname, -status); |
1081 | rpc_exit(task, status); | |
1da177e4 LT |
1082 | } |
1083 | } | |
1084 | ||
1085 | /* | |
e0ab53de | 1086 | * 6a. Handle RPC timeout |
1da177e4 LT |
1087 | * We do not release the request slot, so we keep using the |
1088 | * same XID for all retransmits. | |
1089 | */ | |
1090 | static void | |
1091 | call_timeout(struct rpc_task *task) | |
1092 | { | |
1093 | struct rpc_clnt *clnt = task->tk_client; | |
1094 | ||
1095 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1096 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1097 | goto retry; |
1098 | } | |
1099 | ||
46121cf7 | 1100 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1101 | task->tk_timeouts++; |
1102 | ||
1da177e4 | 1103 | if (RPC_IS_SOFT(task)) { |
f518e35a | 1104 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
1105 | clnt->cl_protname, clnt->cl_server); |
1106 | rpc_exit(task, -EIO); | |
1107 | return; | |
1108 | } | |
1109 | ||
f518e35a | 1110 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1111 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1112 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1113 | clnt->cl_protname, clnt->cl_server); | |
1114 | } | |
35f5a422 | 1115 | rpc_force_rebind(clnt); |
1da177e4 LT |
1116 | |
1117 | retry: | |
1118 | clnt->cl_stats->rpcretrans++; | |
1119 | task->tk_action = call_bind; | |
1120 | task->tk_status = 0; | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * 7. Decode the RPC reply | |
1125 | */ | |
1126 | static void | |
1127 | call_decode(struct rpc_task *task) | |
1128 | { | |
1129 | struct rpc_clnt *clnt = task->tk_client; | |
1130 | struct rpc_rqst *req = task->tk_rqstp; | |
1131 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1132 | __be32 *p; |
1da177e4 | 1133 | |
46121cf7 CL |
1134 | dprintk("RPC: %5u call_decode (status %d)\n", |
1135 | task->tk_pid, task->tk_status); | |
1da177e4 | 1136 | |
f518e35a | 1137 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1138 | printk(KERN_NOTICE "%s: server %s OK\n", |
1139 | clnt->cl_protname, clnt->cl_server); | |
1140 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1141 | } | |
1142 | ||
1143 | if (task->tk_status < 12) { | |
1144 | if (!RPC_IS_SOFT(task)) { | |
1145 | task->tk_action = call_bind; | |
1146 | clnt->cl_stats->rpcretrans++; | |
1147 | goto out_retry; | |
1148 | } | |
46121cf7 CL |
1149 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
1150 | clnt->cl_protname, task->tk_status); | |
da45828e TM |
1151 | task->tk_action = call_timeout; |
1152 | goto out_retry; | |
1da177e4 LT |
1153 | } |
1154 | ||
43ac3f29 TM |
1155 | /* |
1156 | * Ensure that we see all writes made by xprt_complete_rqst() | |
1157 | * before it changed req->rq_received. | |
1158 | */ | |
1159 | smp_rmb(); | |
1da177e4 LT |
1160 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1161 | ||
1162 | /* Check that the softirq receive buffer is valid */ | |
1163 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1164 | sizeof(req->rq_rcv_buf)) != 0); | |
1165 | ||
1166 | /* Verify the RPC header */ | |
abbcf28f TM |
1167 | p = call_verify(task); |
1168 | if (IS_ERR(p)) { | |
1169 | if (p == ERR_PTR(-EAGAIN)) | |
1170 | goto out_retry; | |
1171 | return; | |
1da177e4 LT |
1172 | } |
1173 | ||
abbcf28f | 1174 | task->tk_action = rpc_exit_task; |
1da177e4 | 1175 | |
6d5fcb5a TM |
1176 | if (decode) { |
1177 | lock_kernel(); | |
1da177e4 LT |
1178 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1179 | task->tk_msg.rpc_resp); | |
6d5fcb5a TM |
1180 | unlock_kernel(); |
1181 | } | |
46121cf7 CL |
1182 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1183 | task->tk_status); | |
1da177e4 LT |
1184 | return; |
1185 | out_retry: | |
1186 | req->rq_received = req->rq_private_buf.len = 0; | |
1187 | task->tk_status = 0; | |
241c39b9 TM |
1188 | if (task->tk_client->cl_discrtry) |
1189 | xprt_disconnect(task->tk_xprt); | |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | /* | |
1193 | * 8. Refresh the credentials if rejected by the server | |
1194 | */ | |
1195 | static void | |
1196 | call_refresh(struct rpc_task *task) | |
1197 | { | |
46121cf7 | 1198 | dprint_status(task); |
1da177e4 LT |
1199 | |
1200 | xprt_release(task); /* Must do to obtain new XID */ | |
1201 | task->tk_action = call_refreshresult; | |
1202 | task->tk_status = 0; | |
1203 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1204 | rpcauth_refreshcred(task); | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * 8a. Process the results of a credential refresh | |
1209 | */ | |
1210 | static void | |
1211 | call_refreshresult(struct rpc_task *task) | |
1212 | { | |
1213 | int status = task->tk_status; | |
46121cf7 CL |
1214 | |
1215 | dprint_status(task); | |
1da177e4 LT |
1216 | |
1217 | task->tk_status = 0; | |
1218 | task->tk_action = call_reserve; | |
1219 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1220 | return; | |
1221 | if (status == -EACCES) { | |
1222 | rpc_exit(task, -EACCES); | |
1223 | return; | |
1224 | } | |
1225 | task->tk_action = call_refresh; | |
1226 | if (status != -ETIMEDOUT) | |
1227 | rpc_delay(task, 3*HZ); | |
1228 | return; | |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * Call header serialization | |
1233 | */ | |
d8ed029d | 1234 | static __be32 * |
1da177e4 LT |
1235 | call_header(struct rpc_task *task) |
1236 | { | |
1237 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1238 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1239 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1240 | |
1241 | /* FIXME: check buffer size? */ | |
808012fb CL |
1242 | |
1243 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1244 | *p++ = req->rq_xid; /* XID */ |
1245 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1246 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1247 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1248 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1249 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1250 | p = rpcauth_marshcred(task, p); |
1251 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1252 | return p; | |
1da177e4 LT |
1253 | } |
1254 | ||
1255 | /* | |
1256 | * Reply header verification | |
1257 | */ | |
d8ed029d | 1258 | static __be32 * |
1da177e4 LT |
1259 | call_verify(struct rpc_task *task) |
1260 | { | |
1261 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1262 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1263 | __be32 *p = iov->iov_base; |
1264 | u32 n; | |
1da177e4 LT |
1265 | int error = -EACCES; |
1266 | ||
e8896495 DH |
1267 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1268 | /* RFC-1014 says that the representation of XDR data must be a | |
1269 | * multiple of four bytes | |
1270 | * - if it isn't pointer subtraction in the NFS client may give | |
1271 | * undefined results | |
1272 | */ | |
1273 | printk(KERN_WARNING | |
1274 | "call_verify: XDR representation not a multiple of" | |
1275 | " 4 bytes: 0x%x\n", task->tk_rqstp->rq_rcv_buf.len); | |
1276 | goto out_eio; | |
1277 | } | |
1da177e4 LT |
1278 | if ((len -= 3) < 0) |
1279 | goto out_overflow; | |
1280 | p += 1; /* skip XID */ | |
1281 | ||
1282 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
1283 | printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); | |
abbcf28f | 1284 | goto out_garbage; |
1da177e4 LT |
1285 | } |
1286 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1287 | if (--len < 0) | |
1288 | goto out_overflow; | |
1289 | switch ((n = ntohl(*p++))) { | |
1290 | case RPC_AUTH_ERROR: | |
1291 | break; | |
1292 | case RPC_MISMATCH: | |
46121cf7 CL |
1293 | dprintk("RPC: %5u %s: RPC call version " |
1294 | "mismatch!\n", | |
1295 | task->tk_pid, __FUNCTION__); | |
cdf47706 AG |
1296 | error = -EPROTONOSUPPORT; |
1297 | goto out_err; | |
1da177e4 | 1298 | default: |
46121cf7 CL |
1299 | dprintk("RPC: %5u %s: RPC call rejected, " |
1300 | "unknown error: %x\n", | |
1301 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1302 | goto out_eio; |
1303 | } | |
1304 | if (--len < 0) | |
1305 | goto out_overflow; | |
1306 | switch ((n = ntohl(*p++))) { | |
1307 | case RPC_AUTH_REJECTEDCRED: | |
1308 | case RPC_AUTH_REJECTEDVERF: | |
1309 | case RPCSEC_GSS_CREDPROBLEM: | |
1310 | case RPCSEC_GSS_CTXPROBLEM: | |
1311 | if (!task->tk_cred_retry) | |
1312 | break; | |
1313 | task->tk_cred_retry--; | |
46121cf7 CL |
1314 | dprintk("RPC: %5u %s: retry stale creds\n", |
1315 | task->tk_pid, __FUNCTION__); | |
1da177e4 LT |
1316 | rpcauth_invalcred(task); |
1317 | task->tk_action = call_refresh; | |
abbcf28f | 1318 | goto out_retry; |
1da177e4 LT |
1319 | case RPC_AUTH_BADCRED: |
1320 | case RPC_AUTH_BADVERF: | |
1321 | /* possibly garbled cred/verf? */ | |
1322 | if (!task->tk_garb_retry) | |
1323 | break; | |
1324 | task->tk_garb_retry--; | |
46121cf7 CL |
1325 | dprintk("RPC: %5u %s: retry garbled creds\n", |
1326 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1327 | task->tk_action = call_bind; |
abbcf28f | 1328 | goto out_retry; |
1da177e4 | 1329 | case RPC_AUTH_TOOWEAK: |
1356b8c2 LS |
1330 | printk(KERN_NOTICE "call_verify: server %s requires stronger " |
1331 | "authentication.\n", task->tk_client->cl_server); | |
1da177e4 LT |
1332 | break; |
1333 | default: | |
1334 | printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); | |
1335 | error = -EIO; | |
1336 | } | |
46121cf7 CL |
1337 | dprintk("RPC: %5u %s: call rejected %d\n", |
1338 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1339 | goto out_err; |
1340 | } | |
1341 | if (!(p = rpcauth_checkverf(task, p))) { | |
1342 | printk(KERN_WARNING "call_verify: auth check failed\n"); | |
abbcf28f | 1343 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1344 | } |
d8ed029d | 1345 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1346 | if (len < 0) |
1347 | goto out_overflow; | |
1348 | switch ((n = ntohl(*p++))) { | |
1349 | case RPC_SUCCESS: | |
1350 | return p; | |
1351 | case RPC_PROG_UNAVAIL: | |
46121cf7 CL |
1352 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
1353 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1354 | (unsigned int)task->tk_client->cl_prog, |
1355 | task->tk_client->cl_server); | |
cdf47706 AG |
1356 | error = -EPFNOSUPPORT; |
1357 | goto out_err; | |
1da177e4 | 1358 | case RPC_PROG_MISMATCH: |
46121cf7 CL |
1359 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
1360 | "server %s\n", task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1361 | (unsigned int)task->tk_client->cl_prog, |
1362 | (unsigned int)task->tk_client->cl_vers, | |
1363 | task->tk_client->cl_server); | |
cdf47706 AG |
1364 | error = -EPROTONOSUPPORT; |
1365 | goto out_err; | |
1da177e4 | 1366 | case RPC_PROC_UNAVAIL: |
46121cf7 CL |
1367 | dprintk("RPC: %5u %s: proc %p unsupported by program %u, " |
1368 | "version %u on server %s\n", | |
1369 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1370 | task->tk_msg.rpc_proc, |
1371 | task->tk_client->cl_prog, | |
1372 | task->tk_client->cl_vers, | |
1373 | task->tk_client->cl_server); | |
cdf47706 AG |
1374 | error = -EOPNOTSUPP; |
1375 | goto out_err; | |
1da177e4 | 1376 | case RPC_GARBAGE_ARGS: |
46121cf7 CL |
1377 | dprintk("RPC: %5u %s: server saw garbage\n", |
1378 | task->tk_pid, __FUNCTION__); | |
1da177e4 LT |
1379 | break; /* retry */ |
1380 | default: | |
1381 | printk(KERN_WARNING "call_verify: server accept status: %x\n", n); | |
1382 | /* Also retry */ | |
1383 | } | |
1384 | ||
abbcf28f | 1385 | out_garbage: |
1da177e4 LT |
1386 | task->tk_client->cl_stats->rpcgarbage++; |
1387 | if (task->tk_garb_retry) { | |
1388 | task->tk_garb_retry--; | |
46121cf7 CL |
1389 | dprintk("RPC: %5u %s: retrying\n", |
1390 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1391 | task->tk_action = call_bind; |
abbcf28f TM |
1392 | out_retry: |
1393 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
1394 | } |
1395 | printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); | |
1396 | out_eio: | |
1397 | error = -EIO; | |
1398 | out_err: | |
1399 | rpc_exit(task, error); | |
abbcf28f | 1400 | return ERR_PTR(error); |
1da177e4 LT |
1401 | out_overflow: |
1402 | printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); | |
abbcf28f | 1403 | goto out_garbage; |
1da177e4 | 1404 | } |
5ee0ed7d | 1405 | |
d8ed029d | 1406 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1407 | { |
1408 | return 0; | |
1409 | } | |
1410 | ||
d8ed029d | 1411 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1412 | { |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | static struct rpc_procinfo rpcproc_null = { | |
1417 | .p_encode = rpcproc_encode_null, | |
1418 | .p_decode = rpcproc_decode_null, | |
1419 | }; | |
1420 | ||
1421 | int rpc_ping(struct rpc_clnt *clnt, int flags) | |
1422 | { | |
1423 | struct rpc_message msg = { | |
1424 | .rpc_proc = &rpcproc_null, | |
1425 | }; | |
1426 | int err; | |
1427 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1428 | err = rpc_call_sync(clnt, &msg, flags); | |
1429 | put_rpccred(msg.rpc_cred); | |
1430 | return err; | |
1431 | } |