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> |
510deb0d | 33 | #include <linux/in6.h> |
1da177e4 LT |
34 | |
35 | #include <linux/sunrpc/clnt.h> | |
1da177e4 | 36 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 37 | #include <linux/sunrpc/metrics.h> |
1da177e4 LT |
38 | |
39 | ||
1da177e4 LT |
40 | #ifdef RPC_DEBUG |
41 | # define RPCDBG_FACILITY RPCDBG_CALL | |
42 | #endif | |
43 | ||
46121cf7 CL |
44 | #define dprint_status(t) \ |
45 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
46 | __FUNCTION__, t->tk_status) | |
47 | ||
188fef11 TM |
48 | /* |
49 | * All RPC clients are linked into this list | |
50 | */ | |
51 | static LIST_HEAD(all_clients); | |
52 | static DEFINE_SPINLOCK(rpc_client_lock); | |
53 | ||
1da177e4 LT |
54 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
55 | ||
56 | ||
57 | static void call_start(struct rpc_task *task); | |
58 | static void call_reserve(struct rpc_task *task); | |
59 | static void call_reserveresult(struct rpc_task *task); | |
60 | static void call_allocate(struct rpc_task *task); | |
61 | static void call_encode(struct rpc_task *task); | |
62 | static void call_decode(struct rpc_task *task); | |
63 | static void call_bind(struct rpc_task *task); | |
da351878 | 64 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
65 | static void call_transmit(struct rpc_task *task); |
66 | static void call_status(struct rpc_task *task); | |
940e3318 | 67 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
68 | static void call_refresh(struct rpc_task *task); |
69 | static void call_refreshresult(struct rpc_task *task); | |
70 | static void call_timeout(struct rpc_task *task); | |
71 | static void call_connect(struct rpc_task *task); | |
72 | static void call_connect_status(struct rpc_task *task); | |
d8ed029d AD |
73 | static __be32 * call_header(struct rpc_task *task); |
74 | static __be32 * call_verify(struct rpc_task *task); | |
1da177e4 | 75 | |
64c91a1f TM |
76 | static int rpc_ping(struct rpc_clnt *clnt, int flags); |
77 | ||
188fef11 TM |
78 | static void rpc_register_client(struct rpc_clnt *clnt) |
79 | { | |
80 | spin_lock(&rpc_client_lock); | |
81 | list_add(&clnt->cl_clients, &all_clients); | |
82 | spin_unlock(&rpc_client_lock); | |
83 | } | |
84 | ||
85 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
86 | { | |
87 | spin_lock(&rpc_client_lock); | |
88 | list_del(&clnt->cl_clients); | |
89 | spin_unlock(&rpc_client_lock); | |
90 | } | |
1da177e4 LT |
91 | |
92 | static int | |
93 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
94 | { | |
f134585a | 95 | static uint32_t clntid; |
1da177e4 LT |
96 | int error; |
97 | ||
54281548 TM |
98 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
99 | clnt->cl_dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
100 | if (dir_name == NULL) |
101 | return 0; | |
54281548 TM |
102 | |
103 | clnt->cl_vfsmnt = rpc_get_mount(); | |
104 | if (IS_ERR(clnt->cl_vfsmnt)) | |
105 | return PTR_ERR(clnt->cl_vfsmnt); | |
106 | ||
f134585a TM |
107 | for (;;) { |
108 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
109 | "%s/clnt%x", dir_name, | |
110 | (unsigned int)clntid++); | |
111 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
112 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
113 | if (!IS_ERR(clnt->cl_dentry)) | |
114 | return 0; | |
1da177e4 | 115 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
116 | if (error != -EEXIST) { |
117 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
118 | clnt->cl_pathname, error); | |
54281548 | 119 | rpc_put_mount(); |
f134585a TM |
120 | return error; |
121 | } | |
1da177e4 LT |
122 | } |
123 | } | |
124 | ||
ff9aa5e5 | 125 | 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 |
126 | { |
127 | struct rpc_version *version; | |
128 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 129 | struct rpc_auth *auth; |
1da177e4 | 130 | int err; |
06b8d255 CL |
131 | size_t len; |
132 | ||
133 | /* sanity check the name before trying to print it */ | |
134 | err = -EINVAL; | |
135 | len = strlen(servname); | |
136 | if (len > RPC_MAXNETNAMELEN) | |
137 | goto out_no_rpciod; | |
138 | len++; | |
1da177e4 | 139 | |
46121cf7 CL |
140 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
141 | program->name, servname, xprt); | |
1da177e4 | 142 | |
4ada539e TM |
143 | err = rpciod_up(); |
144 | if (err) | |
145 | goto out_no_rpciod; | |
1da177e4 LT |
146 | err = -EINVAL; |
147 | if (!xprt) | |
712917d1 | 148 | goto out_no_xprt; |
1da177e4 LT |
149 | if (vers >= program->nrvers || !(version = program->version[vers])) |
150 | goto out_err; | |
151 | ||
152 | err = -ENOMEM; | |
0da974f4 | 153 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
154 | if (!clnt) |
155 | goto out_err; | |
1da177e4 LT |
156 | clnt->cl_parent = clnt; |
157 | ||
158 | clnt->cl_server = clnt->cl_inline_name; | |
1da177e4 LT |
159 | if (len > sizeof(clnt->cl_inline_name)) { |
160 | char *buf = kmalloc(len, GFP_KERNEL); | |
161 | if (buf != 0) | |
162 | clnt->cl_server = buf; | |
163 | else | |
164 | len = sizeof(clnt->cl_inline_name); | |
165 | } | |
166 | strlcpy(clnt->cl_server, servname, len); | |
167 | ||
168 | clnt->cl_xprt = xprt; | |
169 | clnt->cl_procinfo = version->procs; | |
170 | clnt->cl_maxproc = version->nrprocs; | |
171 | clnt->cl_protname = program->name; | |
1da177e4 LT |
172 | clnt->cl_prog = program->number; |
173 | clnt->cl_vers = version->number; | |
1da177e4 | 174 | clnt->cl_stats = program->stats; |
11c556b3 | 175 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
176 | err = -ENOMEM; |
177 | if (clnt->cl_metrics == NULL) | |
178 | goto out_no_stats; | |
3e32a5d9 | 179 | clnt->cl_program = program; |
6529eba0 | 180 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 181 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 182 | |
ec739ef0 | 183 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
184 | clnt->cl_autobind = 1; |
185 | ||
186 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
187 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
188 | ||
34f52e35 TM |
189 | kref_init(&clnt->cl_kref); |
190 | ||
1da177e4 LT |
191 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
192 | if (err < 0) | |
193 | goto out_no_path; | |
194 | ||
6a19275a BF |
195 | auth = rpcauth_create(flavor, clnt); |
196 | if (IS_ERR(auth)) { | |
1da177e4 LT |
197 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
198 | flavor); | |
6a19275a | 199 | err = PTR_ERR(auth); |
1da177e4 LT |
200 | goto out_no_auth; |
201 | } | |
202 | ||
203 | /* save the nodename */ | |
e9ff3990 | 204 | clnt->cl_nodelen = strlen(utsname()->nodename); |
1da177e4 LT |
205 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
206 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
e9ff3990 | 207 | memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen); |
6529eba0 | 208 | rpc_register_client(clnt); |
1da177e4 LT |
209 | return clnt; |
210 | ||
211 | out_no_auth: | |
54281548 | 212 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 213 | rpc_rmdir(clnt->cl_dentry); |
54281548 TM |
214 | rpc_put_mount(); |
215 | } | |
1da177e4 | 216 | out_no_path: |
23bf85ba TM |
217 | rpc_free_iostats(clnt->cl_metrics); |
218 | out_no_stats: | |
1da177e4 LT |
219 | if (clnt->cl_server != clnt->cl_inline_name) |
220 | kfree(clnt->cl_server); | |
221 | kfree(clnt); | |
222 | out_err: | |
6b6ca86b | 223 | xprt_put(xprt); |
712917d1 | 224 | out_no_xprt: |
4ada539e TM |
225 | rpciod_down(); |
226 | out_no_rpciod: | |
1da177e4 LT |
227 | return ERR_PTR(err); |
228 | } | |
229 | ||
c2866763 CL |
230 | /* |
231 | * rpc_create - create an RPC client and transport with one call | |
232 | * @args: rpc_clnt create argument structure | |
233 | * | |
234 | * Creates and initializes an RPC transport and an RPC client. | |
235 | * | |
236 | * It can ping the server in order to determine if it is up, and to see if | |
237 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
238 | * this behavior so asynchronous tasks can also use rpc_create. | |
239 | */ | |
240 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
241 | { | |
242 | struct rpc_xprt *xprt; | |
243 | struct rpc_clnt *clnt; | |
3c341b0b | 244 | struct xprt_create xprtargs = { |
4fa016eb | 245 | .ident = args->protocol, |
d3bc9a1d | 246 | .srcaddr = args->saddress, |
96802a09 FM |
247 | .dstaddr = args->address, |
248 | .addrlen = args->addrsize, | |
249 | .timeout = args->timeout | |
250 | }; | |
510deb0d | 251 | char servername[48]; |
c2866763 | 252 | |
96802a09 | 253 | xprt = xprt_create_transport(&xprtargs); |
c2866763 CL |
254 | if (IS_ERR(xprt)) |
255 | return (struct rpc_clnt *)xprt; | |
256 | ||
43780b87 CL |
257 | /* |
258 | * If the caller chooses not to specify a hostname, whip | |
259 | * up a string representation of the passed-in address. | |
260 | */ | |
261 | if (args->servername == NULL) { | |
510deb0d CL |
262 | servername[0] = '\0'; |
263 | switch (args->address->sa_family) { | |
264 | case AF_INET: { | |
265 | struct sockaddr_in *sin = | |
266 | (struct sockaddr_in *)args->address; | |
267 | snprintf(servername, sizeof(servername), NIPQUAD_FMT, | |
268 | NIPQUAD(sin->sin_addr.s_addr)); | |
269 | break; | |
270 | } | |
271 | case AF_INET6: { | |
272 | struct sockaddr_in6 *sin = | |
273 | (struct sockaddr_in6 *)args->address; | |
274 | snprintf(servername, sizeof(servername), NIP6_FMT, | |
275 | NIP6(sin->sin6_addr)); | |
276 | break; | |
277 | } | |
278 | default: | |
279 | /* caller wants default server name, but | |
280 | * address family isn't recognized. */ | |
281 | return ERR_PTR(-EINVAL); | |
282 | } | |
43780b87 CL |
283 | args->servername = servername; |
284 | } | |
285 | ||
510deb0d CL |
286 | xprt = xprt_create_transport(&xprtargs); |
287 | if (IS_ERR(xprt)) | |
288 | return (struct rpc_clnt *)xprt; | |
289 | ||
c2866763 CL |
290 | /* |
291 | * By default, kernel RPC client connects from a reserved port. | |
292 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
293 | * but it is always enabled for rpciod, which handles the connect | |
294 | * operation. | |
295 | */ | |
296 | xprt->resvport = 1; | |
297 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
298 | xprt->resvport = 0; | |
299 | ||
c2866763 CL |
300 | clnt = rpc_new_client(xprt, args->servername, args->program, |
301 | args->version, args->authflavor); | |
302 | if (IS_ERR(clnt)) | |
303 | return clnt; | |
304 | ||
305 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
306 | int err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
307 | if (err != 0) { | |
308 | rpc_shutdown_client(clnt); | |
309 | return ERR_PTR(err); | |
310 | } | |
311 | } | |
312 | ||
313 | clnt->cl_softrtry = 1; | |
314 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
315 | clnt->cl_softrtry = 0; | |
316 | ||
317 | if (args->flags & RPC_CLNT_CREATE_INTR) | |
318 | clnt->cl_intr = 1; | |
319 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
320 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
321 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
322 | clnt->cl_discrtry = 1; | |
c2866763 CL |
323 | |
324 | return clnt; | |
325 | } | |
b86acd50 | 326 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 327 | |
1da177e4 LT |
328 | /* |
329 | * This function clones the RPC client structure. It allows us to share the | |
330 | * same transport while varying parameters such as the authentication | |
331 | * flavour. | |
332 | */ | |
333 | struct rpc_clnt * | |
334 | rpc_clone_client(struct rpc_clnt *clnt) | |
335 | { | |
336 | struct rpc_clnt *new; | |
3e32a5d9 | 337 | int err = -ENOMEM; |
1da177e4 | 338 | |
e69062b4 | 339 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
340 | if (!new) |
341 | goto out_no_clnt; | |
d431a555 TM |
342 | new->cl_parent = clnt; |
343 | /* Turn off autobind on clones */ | |
344 | new->cl_autobind = 0; | |
345 | INIT_LIST_HEAD(&new->cl_tasks); | |
346 | spin_lock_init(&new->cl_lock); | |
347 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); | |
23bf85ba TM |
348 | new->cl_metrics = rpc_alloc_iostats(clnt); |
349 | if (new->cl_metrics == NULL) | |
350 | goto out_no_stats; | |
34f52e35 | 351 | kref_init(&new->cl_kref); |
3e32a5d9 TM |
352 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
353 | if (err != 0) | |
354 | goto out_no_path; | |
1da177e4 LT |
355 | if (new->cl_auth) |
356 | atomic_inc(&new->cl_auth->au_count); | |
d431a555 TM |
357 | xprt_get(clnt->cl_xprt); |
358 | kref_get(&clnt->cl_kref); | |
6529eba0 | 359 | rpc_register_client(new); |
4ada539e | 360 | rpciod_up(); |
1da177e4 | 361 | return new; |
3e32a5d9 TM |
362 | out_no_path: |
363 | rpc_free_iostats(new->cl_metrics); | |
23bf85ba TM |
364 | out_no_stats: |
365 | kfree(new); | |
1da177e4 | 366 | out_no_clnt: |
46121cf7 | 367 | dprintk("RPC: %s: returned error %d\n", __FUNCTION__, err); |
3e32a5d9 | 368 | return ERR_PTR(err); |
1da177e4 | 369 | } |
e8914c65 | 370 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 LT |
371 | |
372 | /* | |
373 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 374 | * requests. |
1da177e4 | 375 | */ |
4c402b40 | 376 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 377 | { |
34f52e35 TM |
378 | dprintk("RPC: shutting down %s client for %s\n", |
379 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 | 380 | |
34f52e35 | 381 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 382 | rpc_killall_tasks(clnt); |
532347e2 | 383 | wait_event_timeout(destroy_wait, |
34f52e35 | 384 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
385 | } |
386 | ||
4c402b40 | 387 | rpc_release_client(clnt); |
1da177e4 | 388 | } |
e8914c65 | 389 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
390 | |
391 | /* | |
34f52e35 | 392 | * Free an RPC client |
1da177e4 | 393 | */ |
34f52e35 TM |
394 | static void |
395 | rpc_free_client(struct kref *kref) | |
1da177e4 | 396 | { |
34f52e35 | 397 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
1da177e4 | 398 | |
46121cf7 | 399 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 | 400 | clnt->cl_protname, clnt->cl_server); |
8f8e7a50 | 401 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 402 | rpc_rmdir(clnt->cl_dentry); |
8f8e7a50 TM |
403 | rpc_put_mount(); |
404 | } | |
3e32a5d9 | 405 | if (clnt->cl_parent != clnt) { |
8ad7c892 | 406 | rpc_release_client(clnt->cl_parent); |
3e32a5d9 TM |
407 | goto out_free; |
408 | } | |
1da177e4 LT |
409 | if (clnt->cl_server != clnt->cl_inline_name) |
410 | kfree(clnt->cl_server); | |
411 | out_free: | |
6529eba0 | 412 | rpc_unregister_client(clnt); |
11c556b3 CL |
413 | rpc_free_iostats(clnt->cl_metrics); |
414 | clnt->cl_metrics = NULL; | |
6b6ca86b | 415 | xprt_put(clnt->cl_xprt); |
4ada539e | 416 | rpciod_down(); |
1da177e4 | 417 | kfree(clnt); |
1da177e4 LT |
418 | } |
419 | ||
1dd17ec6 TM |
420 | /* |
421 | * Free an RPC client | |
422 | */ | |
423 | static void | |
424 | rpc_free_auth(struct kref *kref) | |
425 | { | |
426 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); | |
427 | ||
428 | if (clnt->cl_auth == NULL) { | |
429 | rpc_free_client(kref); | |
430 | return; | |
431 | } | |
432 | ||
433 | /* | |
434 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
435 | * release remaining GSS contexts. This mechanism ensures | |
436 | * that it can do so safely. | |
437 | */ | |
438 | kref_init(kref); | |
439 | rpcauth_release(clnt->cl_auth); | |
440 | clnt->cl_auth = NULL; | |
441 | kref_put(kref, rpc_free_client); | |
442 | } | |
443 | ||
1da177e4 | 444 | /* |
34f52e35 | 445 | * Release reference to the RPC client |
1da177e4 LT |
446 | */ |
447 | void | |
448 | rpc_release_client(struct rpc_clnt *clnt) | |
449 | { | |
34f52e35 | 450 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 451 | |
34f52e35 TM |
452 | if (list_empty(&clnt->cl_tasks)) |
453 | wake_up(&destroy_wait); | |
1dd17ec6 | 454 | kref_put(&clnt->cl_kref, rpc_free_auth); |
34f52e35 TM |
455 | } |
456 | ||
007e251f AG |
457 | /** |
458 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
459 | * @old - old rpc_client | |
460 | * @program - rpc program to set | |
461 | * @vers - rpc program version | |
462 | * | |
463 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
464 | * of use for enabling different RPC programs to share the same transport. | |
465 | * The Sun NFSv2/v3 ACL protocol can do this. | |
466 | */ | |
467 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
468 | struct rpc_program *program, | |
89eb21c3 | 469 | u32 vers) |
007e251f AG |
470 | { |
471 | struct rpc_clnt *clnt; | |
472 | struct rpc_version *version; | |
473 | int err; | |
474 | ||
475 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
476 | version = program->version[vers]; | |
477 | clnt = rpc_clone_client(old); | |
478 | if (IS_ERR(clnt)) | |
479 | goto out; | |
480 | clnt->cl_procinfo = version->procs; | |
481 | clnt->cl_maxproc = version->nrprocs; | |
482 | clnt->cl_protname = program->name; | |
483 | clnt->cl_prog = program->number; | |
484 | clnt->cl_vers = version->number; | |
485 | clnt->cl_stats = program->stats; | |
486 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
487 | if (err != 0) { | |
488 | rpc_shutdown_client(clnt); | |
489 | clnt = ERR_PTR(err); | |
490 | } | |
cca5172a | 491 | out: |
007e251f AG |
492 | return clnt; |
493 | } | |
e8914c65 | 494 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 495 | |
1da177e4 LT |
496 | /* |
497 | * Default callback for async RPC calls | |
498 | */ | |
499 | static void | |
963d8fe5 | 500 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
501 | { |
502 | } | |
503 | ||
963d8fe5 TM |
504 | static const struct rpc_call_ops rpc_default_ops = { |
505 | .rpc_call_done = rpc_default_callback, | |
506 | }; | |
507 | ||
1da177e4 | 508 | /* |
14b218a8 | 509 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
510 | * sleeps on RPC calls |
511 | */ | |
2bd61579 | 512 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
cca5172a | 513 | |
14b218a8 TM |
514 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
515 | { | |
2bd61579 | 516 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
517 | sigset_t sigmask; |
518 | ||
519 | /* Block all signals except those listed in sigallow */ | |
520 | if (intr) | |
521 | sigallow |= RPC_INTR_SIGNALS; | |
522 | siginitsetinv(&sigmask, sigallow); | |
523 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
524 | } | |
525 | ||
50859259 | 526 | static void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) |
14b218a8 TM |
527 | { |
528 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
529 | } | |
530 | ||
50859259 | 531 | static void rpc_restore_sigmask(sigset_t *oldset) |
14b218a8 TM |
532 | { |
533 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
534 | } | |
535 | ||
1da177e4 LT |
536 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
537 | { | |
14b218a8 | 538 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 | 539 | } |
e8914c65 | 540 | EXPORT_SYMBOL_GPL(rpc_clnt_sigmask); |
1da177e4 LT |
541 | |
542 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
543 | { | |
14b218a8 | 544 | rpc_restore_sigmask(oldset); |
1da177e4 | 545 | } |
e8914c65 | 546 | EXPORT_SYMBOL_GPL(rpc_clnt_sigunmask); |
1da177e4 | 547 | |
c970aa85 TM |
548 | /** |
549 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
550 | * @task_setup_data: pointer to task initialisation data | |
551 | */ | |
552 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 TM |
553 | { |
554 | struct rpc_task *task, *ret; | |
555 | sigset_t oldset; | |
556 | ||
84115e1c | 557 | task = rpc_new_task(task_setup_data); |
6e5b70e9 | 558 | if (task == NULL) { |
84115e1c TM |
559 | rpc_release_calldata(task_setup_data->callback_ops, |
560 | task_setup_data->callback_data); | |
50859259 TM |
561 | ret = ERR_PTR(-ENOMEM); |
562 | goto out; | |
6e5b70e9 TM |
563 | } |
564 | ||
b3ef8b3b TM |
565 | if (task->tk_status != 0) { |
566 | ret = ERR_PTR(task->tk_status); | |
567 | rpc_put_task(task); | |
568 | goto out; | |
6e5b70e9 TM |
569 | } |
570 | atomic_inc(&task->tk_count); | |
50859259 TM |
571 | /* Mask signals on synchronous RPC calls and RPCSEC_GSS upcalls */ |
572 | rpc_task_sigmask(task, &oldset); | |
6e5b70e9 | 573 | rpc_execute(task); |
50859259 | 574 | rpc_restore_sigmask(&oldset); |
6e5b70e9 TM |
575 | ret = task; |
576 | out: | |
6e5b70e9 TM |
577 | return ret; |
578 | } | |
c970aa85 | 579 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
580 | |
581 | /** | |
582 | * rpc_call_sync - Perform a synchronous RPC call | |
583 | * @clnt: pointer to RPC client | |
584 | * @msg: RPC call parameters | |
585 | * @flags: RPC call flags | |
1da177e4 LT |
586 | */ |
587 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
588 | { | |
589 | struct rpc_task *task; | |
84115e1c TM |
590 | struct rpc_task_setup task_setup_data = { |
591 | .rpc_client = clnt, | |
592 | .rpc_message = msg, | |
593 | .callback_ops = &rpc_default_ops, | |
594 | .flags = flags, | |
595 | }; | |
6e5b70e9 | 596 | int status; |
1da177e4 | 597 | |
1da177e4 LT |
598 | BUG_ON(flags & RPC_TASK_ASYNC); |
599 | ||
c970aa85 | 600 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
601 | if (IS_ERR(task)) |
602 | return PTR_ERR(task); | |
e60859ac | 603 | status = task->tk_status; |
bde8f00c | 604 | rpc_put_task(task); |
1da177e4 LT |
605 | return status; |
606 | } | |
e8914c65 | 607 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 608 | |
6e5b70e9 TM |
609 | /** |
610 | * rpc_call_async - Perform an asynchronous RPC call | |
611 | * @clnt: pointer to RPC client | |
612 | * @msg: RPC call parameters | |
613 | * @flags: RPC call flags | |
614 | * @ops: RPC call ops | |
615 | * @data: user call data | |
1da177e4 LT |
616 | */ |
617 | int | |
618 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 619 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
620 | { |
621 | struct rpc_task *task; | |
84115e1c TM |
622 | struct rpc_task_setup task_setup_data = { |
623 | .rpc_client = clnt, | |
624 | .rpc_message = msg, | |
625 | .callback_ops = tk_ops, | |
626 | .callback_data = data, | |
627 | .flags = flags|RPC_TASK_ASYNC, | |
628 | }; | |
1da177e4 | 629 | |
c970aa85 | 630 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
631 | if (IS_ERR(task)) |
632 | return PTR_ERR(task); | |
633 | rpc_put_task(task); | |
634 | return 0; | |
1da177e4 | 635 | } |
e8914c65 | 636 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 637 | |
77de2c59 TM |
638 | void |
639 | rpc_call_start(struct rpc_task *task) | |
640 | { | |
641 | task->tk_action = call_start; | |
642 | } | |
643 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
644 | ||
ed39440a CL |
645 | /** |
646 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
647 | * @clnt: RPC client structure | |
648 | * @buf: target buffer | |
649 | * @size: length of target buffer | |
650 | * | |
651 | * Returns the number of bytes that are actually in the stored address. | |
652 | */ | |
653 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
654 | { | |
655 | size_t bytes; | |
656 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
657 | ||
658 | bytes = sizeof(xprt->addr); | |
659 | if (bytes > bufsize) | |
660 | bytes = bufsize; | |
661 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 662 | return xprt->addrlen; |
ed39440a | 663 | } |
b86acd50 | 664 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 665 | |
f425eba4 CL |
666 | /** |
667 | * rpc_peeraddr2str - return remote peer address in printable format | |
668 | * @clnt: RPC client structure | |
669 | * @format: address format | |
670 | * | |
671 | */ | |
672 | char *rpc_peeraddr2str(struct rpc_clnt *clnt, enum rpc_display_format_t format) | |
673 | { | |
674 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
675 | |
676 | if (xprt->address_strings[format] != NULL) | |
677 | return xprt->address_strings[format]; | |
678 | else | |
679 | return "unprintable"; | |
f425eba4 | 680 | } |
b86acd50 | 681 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 682 | |
1da177e4 LT |
683 | void |
684 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
685 | { | |
686 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
687 | if (xprt->ops->set_buffer_size) |
688 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 | 689 | } |
e8914c65 | 690 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 LT |
691 | |
692 | /* | |
693 | * Return size of largest payload RPC client can support, in bytes | |
694 | * | |
695 | * For stream transports, this is one RPC record fragment (see RFC | |
696 | * 1831), as we don't support multi-record requests yet. For datagram | |
697 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
698 | * RPC header sizes. | |
699 | */ | |
700 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
701 | { | |
702 | return clnt->cl_xprt->max_payload; | |
703 | } | |
b86acd50 | 704 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 705 | |
35f5a422 CL |
706 | /** |
707 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
708 | * @clnt: client to rebind | |
709 | * | |
710 | */ | |
711 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
712 | { | |
713 | if (clnt->cl_autobind) | |
ec739ef0 | 714 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 715 | } |
b86acd50 | 716 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 717 | |
1da177e4 LT |
718 | /* |
719 | * Restart an (async) RPC call. Usually called from within the | |
720 | * exit handler. | |
721 | */ | |
722 | void | |
723 | rpc_restart_call(struct rpc_task *task) | |
724 | { | |
725 | if (RPC_ASSASSINATED(task)) | |
726 | return; | |
727 | ||
728 | task->tk_action = call_start; | |
729 | } | |
e8914c65 | 730 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 LT |
731 | |
732 | /* | |
733 | * 0. Initial state | |
734 | * | |
735 | * Other FSM states can be visited zero or more times, but | |
736 | * this state is visited exactly once for each RPC. | |
737 | */ | |
738 | static void | |
739 | call_start(struct rpc_task *task) | |
740 | { | |
741 | struct rpc_clnt *clnt = task->tk_client; | |
742 | ||
46121cf7 CL |
743 | dprintk("RPC: %5u call_start %s%d proc %d (%s)\n", task->tk_pid, |
744 | clnt->cl_protname, clnt->cl_vers, | |
745 | task->tk_msg.rpc_proc->p_proc, | |
746 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
1da177e4 LT |
747 | |
748 | /* Increment call count */ | |
749 | task->tk_msg.rpc_proc->p_count++; | |
750 | clnt->cl_stats->rpccnt++; | |
751 | task->tk_action = call_reserve; | |
752 | } | |
753 | ||
754 | /* | |
755 | * 1. Reserve an RPC call slot | |
756 | */ | |
757 | static void | |
758 | call_reserve(struct rpc_task *task) | |
759 | { | |
46121cf7 | 760 | dprint_status(task); |
1da177e4 LT |
761 | |
762 | if (!rpcauth_uptodatecred(task)) { | |
763 | task->tk_action = call_refresh; | |
764 | return; | |
765 | } | |
766 | ||
767 | task->tk_status = 0; | |
768 | task->tk_action = call_reserveresult; | |
769 | xprt_reserve(task); | |
770 | } | |
771 | ||
772 | /* | |
773 | * 1b. Grok the result of xprt_reserve() | |
774 | */ | |
775 | static void | |
776 | call_reserveresult(struct rpc_task *task) | |
777 | { | |
778 | int status = task->tk_status; | |
779 | ||
46121cf7 | 780 | dprint_status(task); |
1da177e4 LT |
781 | |
782 | /* | |
783 | * After a call to xprt_reserve(), we must have either | |
784 | * a request slot or else an error status. | |
785 | */ | |
786 | task->tk_status = 0; | |
787 | if (status >= 0) { | |
788 | if (task->tk_rqstp) { | |
789 | task->tk_action = call_allocate; | |
790 | return; | |
791 | } | |
792 | ||
793 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
794 | __FUNCTION__, status); | |
795 | rpc_exit(task, -EIO); | |
796 | return; | |
797 | } | |
798 | ||
799 | /* | |
800 | * Even though there was an error, we may have acquired | |
801 | * a request slot somehow. Make sure not to leak it. | |
802 | */ | |
803 | if (task->tk_rqstp) { | |
804 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
805 | __FUNCTION__, status); | |
806 | xprt_release(task); | |
807 | } | |
808 | ||
809 | switch (status) { | |
810 | case -EAGAIN: /* woken up; retry */ | |
811 | task->tk_action = call_reserve; | |
812 | return; | |
813 | case -EIO: /* probably a shutdown */ | |
814 | break; | |
815 | default: | |
816 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
817 | __FUNCTION__, status); | |
818 | break; | |
819 | } | |
820 | rpc_exit(task, status); | |
821 | } | |
822 | ||
823 | /* | |
824 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 825 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
826 | */ |
827 | static void | |
828 | call_allocate(struct rpc_task *task) | |
829 | { | |
1be27f36 | 830 | unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; |
02107148 CL |
831 | struct rpc_rqst *req = task->tk_rqstp; |
832 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 833 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 834 | |
46121cf7 CL |
835 | dprint_status(task); |
836 | ||
2bea90d4 | 837 | task->tk_status = 0; |
1da177e4 | 838 | task->tk_action = call_bind; |
2bea90d4 | 839 | |
02107148 | 840 | if (req->rq_buffer) |
1da177e4 LT |
841 | return; |
842 | ||
2bea90d4 CL |
843 | if (proc->p_proc != 0) { |
844 | BUG_ON(proc->p_arglen == 0); | |
845 | if (proc->p_decode != NULL) | |
846 | BUG_ON(proc->p_replen == 0); | |
847 | } | |
1da177e4 | 848 | |
2bea90d4 CL |
849 | /* |
850 | * Calculate the size (in quads) of the RPC call | |
851 | * and reply headers, and convert both values | |
852 | * to byte sizes. | |
853 | */ | |
854 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
855 | req->rq_callsize <<= 2; | |
856 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
857 | req->rq_rcvsize <<= 2; | |
858 | ||
c5a4dd8b CL |
859 | req->rq_buffer = xprt->ops->buf_alloc(task, |
860 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 861 | if (req->rq_buffer != NULL) |
1da177e4 | 862 | return; |
46121cf7 CL |
863 | |
864 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 865 | |
14b218a8 | 866 | if (RPC_IS_ASYNC(task) || !signalled()) { |
b6e9c713 | 867 | task->tk_action = call_allocate; |
1da177e4 LT |
868 | rpc_delay(task, HZ>>4); |
869 | return; | |
870 | } | |
871 | ||
872 | rpc_exit(task, -ERESTARTSYS); | |
873 | } | |
874 | ||
940e3318 TM |
875 | static inline int |
876 | rpc_task_need_encode(struct rpc_task *task) | |
877 | { | |
878 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
879 | } | |
880 | ||
881 | static inline void | |
882 | rpc_task_force_reencode(struct rpc_task *task) | |
883 | { | |
884 | task->tk_rqstp->rq_snd_buf.len = 0; | |
885 | } | |
886 | ||
2bea90d4 CL |
887 | static inline void |
888 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
889 | { | |
890 | buf->head[0].iov_base = start; | |
891 | buf->head[0].iov_len = len; | |
892 | buf->tail[0].iov_len = 0; | |
893 | buf->page_len = 0; | |
4f22ccc3 | 894 | buf->flags = 0; |
2bea90d4 CL |
895 | buf->len = 0; |
896 | buf->buflen = len; | |
897 | } | |
898 | ||
1da177e4 LT |
899 | /* |
900 | * 3. Encode arguments of an RPC call | |
901 | */ | |
902 | static void | |
903 | call_encode(struct rpc_task *task) | |
904 | { | |
1da177e4 | 905 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 906 | kxdrproc_t encode; |
d8ed029d | 907 | __be32 *p; |
1da177e4 | 908 | |
46121cf7 | 909 | dprint_status(task); |
1da177e4 | 910 | |
2bea90d4 CL |
911 | rpc_xdr_buf_init(&req->rq_snd_buf, |
912 | req->rq_buffer, | |
913 | req->rq_callsize); | |
914 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
915 | (char *)req->rq_buffer + req->rq_callsize, | |
916 | req->rq_rcvsize); | |
1da177e4 LT |
917 | |
918 | /* Encode header and provided arguments */ | |
919 | encode = task->tk_msg.rpc_proc->p_encode; | |
920 | if (!(p = call_header(task))) { | |
921 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
922 | rpc_exit(task, -EIO); | |
923 | return; | |
924 | } | |
f3680312 BF |
925 | if (encode == NULL) |
926 | return; | |
927 | ||
928 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
929 | task->tk_msg.rpc_argp); | |
930 | if (task->tk_status == -ENOMEM) { | |
931 | /* XXX: Is this sane? */ | |
932 | rpc_delay(task, 3*HZ); | |
933 | task->tk_status = -EAGAIN; | |
934 | } | |
1da177e4 LT |
935 | } |
936 | ||
937 | /* | |
938 | * 4. Get the server port number if not yet set | |
939 | */ | |
940 | static void | |
941 | call_bind(struct rpc_task *task) | |
942 | { | |
ec739ef0 | 943 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 944 | |
46121cf7 | 945 | dprint_status(task); |
1da177e4 | 946 | |
da351878 | 947 | task->tk_action = call_connect; |
ec739ef0 | 948 | if (!xprt_bound(xprt)) { |
da351878 | 949 | task->tk_action = call_bind_status; |
ec739ef0 | 950 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 951 | xprt->ops->rpcbind(task); |
1da177e4 LT |
952 | } |
953 | } | |
954 | ||
955 | /* | |
da351878 CL |
956 | * 4a. Sort out bind result |
957 | */ | |
958 | static void | |
959 | call_bind_status(struct rpc_task *task) | |
960 | { | |
906462af | 961 | int status = -EIO; |
da351878 CL |
962 | |
963 | if (task->tk_status >= 0) { | |
46121cf7 | 964 | dprint_status(task); |
da351878 CL |
965 | task->tk_status = 0; |
966 | task->tk_action = call_connect; | |
967 | return; | |
968 | } | |
969 | ||
970 | switch (task->tk_status) { | |
2429cbf6 CL |
971 | case -EAGAIN: |
972 | dprintk("RPC: %5u rpcbind waiting for another request " | |
973 | "to finish\n", task->tk_pid); | |
974 | /* avoid busy-waiting here -- could be a network outage. */ | |
975 | rpc_delay(task, 5*HZ); | |
976 | goto retry_timeout; | |
da351878 | 977 | case -EACCES: |
46121cf7 CL |
978 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
979 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
980 | /* fail immediately if this is an RPC ping */ |
981 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
982 | status = -EOPNOTSUPP; | |
983 | break; | |
984 | } | |
ea635a51 | 985 | rpc_delay(task, 3*HZ); |
da45828e | 986 | goto retry_timeout; |
da351878 | 987 | case -ETIMEDOUT: |
46121cf7 | 988 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 989 | task->tk_pid); |
da45828e | 990 | goto retry_timeout; |
da351878 | 991 | case -EPFNOSUPPORT: |
906462af | 992 | /* server doesn't support any rpcbind version we know of */ |
46121cf7 | 993 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
da351878 CL |
994 | task->tk_pid); |
995 | break; | |
996 | case -EPROTONOSUPPORT: | |
00a6e7bb | 997 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 998 | task->tk_pid); |
00a6e7bb CL |
999 | task->tk_status = 0; |
1000 | task->tk_action = call_bind; | |
1001 | return; | |
da351878 | 1002 | default: |
46121cf7 | 1003 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1004 | task->tk_pid, -task->tk_status); |
da351878 CL |
1005 | } |
1006 | ||
1007 | rpc_exit(task, status); | |
1008 | return; | |
1009 | ||
da45828e TM |
1010 | retry_timeout: |
1011 | task->tk_action = call_timeout; | |
da351878 CL |
1012 | } |
1013 | ||
1014 | /* | |
1015 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1016 | */ |
1017 | static void | |
1018 | call_connect(struct rpc_task *task) | |
1019 | { | |
da351878 | 1020 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1021 | |
46121cf7 | 1022 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1023 | task->tk_pid, xprt, |
1024 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1025 | |
da351878 CL |
1026 | task->tk_action = call_transmit; |
1027 | if (!xprt_connected(xprt)) { | |
1028 | task->tk_action = call_connect_status; | |
1029 | if (task->tk_status < 0) | |
1030 | return; | |
1031 | xprt_connect(task); | |
1da177e4 | 1032 | } |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | /* | |
da351878 | 1036 | * 4c. Sort out connect result |
1da177e4 LT |
1037 | */ |
1038 | static void | |
1039 | call_connect_status(struct rpc_task *task) | |
1040 | { | |
1041 | struct rpc_clnt *clnt = task->tk_client; | |
1042 | int status = task->tk_status; | |
1043 | ||
46121cf7 | 1044 | dprint_status(task); |
da351878 | 1045 | |
1da177e4 LT |
1046 | task->tk_status = 0; |
1047 | if (status >= 0) { | |
1048 | clnt->cl_stats->netreconn++; | |
1049 | task->tk_action = call_transmit; | |
1050 | return; | |
1051 | } | |
1052 | ||
da351878 | 1053 | /* Something failed: remote service port may have changed */ |
35f5a422 | 1054 | rpc_force_rebind(clnt); |
da351878 | 1055 | |
1da177e4 LT |
1056 | switch (status) { |
1057 | case -ENOTCONN: | |
1da177e4 | 1058 | case -EAGAIN: |
da351878 | 1059 | task->tk_action = call_bind; |
da45828e TM |
1060 | if (!RPC_IS_SOFT(task)) |
1061 | return; | |
1062 | /* if soft mounted, test if we've timed out */ | |
1063 | case -ETIMEDOUT: | |
1064 | task->tk_action = call_timeout; | |
1065 | return; | |
1da177e4 | 1066 | } |
da45828e | 1067 | rpc_exit(task, -EIO); |
1da177e4 LT |
1068 | } |
1069 | ||
1070 | /* | |
1071 | * 5. Transmit the RPC request, and wait for reply | |
1072 | */ | |
1073 | static void | |
1074 | call_transmit(struct rpc_task *task) | |
1075 | { | |
46121cf7 | 1076 | dprint_status(task); |
1da177e4 LT |
1077 | |
1078 | task->tk_action = call_status; | |
1079 | if (task->tk_status < 0) | |
1080 | return; | |
1081 | task->tk_status = xprt_prepare_transmit(task); | |
1082 | if (task->tk_status != 0) | |
1083 | return; | |
e0ab53de | 1084 | task->tk_action = call_transmit_status; |
1da177e4 | 1085 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1086 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1087 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
1da177e4 | 1088 | call_encode(task); |
5e5ce5be TM |
1089 | /* Did the encode result in an error condition? */ |
1090 | if (task->tk_status != 0) | |
e0ab53de | 1091 | return; |
5e5ce5be | 1092 | } |
1da177e4 LT |
1093 | xprt_transmit(task); |
1094 | if (task->tk_status < 0) | |
1095 | return; | |
e0ab53de TM |
1096 | /* |
1097 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1098 | * in order to allow access to the socket to other RPC requests. | |
1099 | */ | |
1100 | call_transmit_status(task); | |
1101 | if (task->tk_msg.rpc_proc->p_decode != NULL) | |
1102 | return; | |
1103 | task->tk_action = rpc_exit_task; | |
1104 | rpc_wake_up_task(task); | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * 5a. Handle cleanup after a transmission | |
1109 | */ | |
1110 | static void | |
1111 | call_transmit_status(struct rpc_task *task) | |
1112 | { | |
1113 | task->tk_action = call_status; | |
1114 | /* | |
1115 | * Special case: if we've been waiting on the socket's write_space() | |
1116 | * callback, then don't call xprt_end_transmit(). | |
1117 | */ | |
1118 | if (task->tk_status == -EAGAIN) | |
1119 | return; | |
1120 | xprt_end_transmit(task); | |
940e3318 | 1121 | rpc_task_force_reencode(task); |
1da177e4 LT |
1122 | } |
1123 | ||
1124 | /* | |
1125 | * 6. Sort out the RPC call status | |
1126 | */ | |
1127 | static void | |
1128 | call_status(struct rpc_task *task) | |
1129 | { | |
1130 | struct rpc_clnt *clnt = task->tk_client; | |
1131 | struct rpc_rqst *req = task->tk_rqstp; | |
1132 | int status; | |
1133 | ||
1134 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
1135 | task->tk_status = req->rq_received; | |
1136 | ||
46121cf7 | 1137 | dprint_status(task); |
1da177e4 LT |
1138 | |
1139 | status = task->tk_status; | |
1140 | if (status >= 0) { | |
1141 | task->tk_action = call_decode; | |
1142 | return; | |
1143 | } | |
1144 | ||
1145 | task->tk_status = 0; | |
1146 | switch(status) { | |
76303992 TM |
1147 | case -EHOSTDOWN: |
1148 | case -EHOSTUNREACH: | |
1149 | case -ENETUNREACH: | |
1150 | /* | |
1151 | * Delay any retries for 3 seconds, then handle as if it | |
1152 | * were a timeout. | |
1153 | */ | |
1154 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1155 | case -ETIMEDOUT: |
1156 | task->tk_action = call_timeout; | |
241c39b9 | 1157 | if (task->tk_client->cl_discrtry) |
3ebb067d | 1158 | xprt_force_disconnect(task->tk_xprt); |
1da177e4 LT |
1159 | break; |
1160 | case -ECONNREFUSED: | |
1161 | case -ENOTCONN: | |
35f5a422 | 1162 | rpc_force_rebind(clnt); |
1da177e4 LT |
1163 | task->tk_action = call_bind; |
1164 | break; | |
1165 | case -EAGAIN: | |
1166 | task->tk_action = call_transmit; | |
1167 | break; | |
1168 | case -EIO: | |
1169 | /* shutdown or soft timeout */ | |
1170 | rpc_exit(task, status); | |
1171 | break; | |
1172 | default: | |
f518e35a | 1173 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
1174 | clnt->cl_protname, -status); |
1175 | rpc_exit(task, status); | |
1da177e4 LT |
1176 | } |
1177 | } | |
1178 | ||
1179 | /* | |
e0ab53de | 1180 | * 6a. Handle RPC timeout |
1da177e4 LT |
1181 | * We do not release the request slot, so we keep using the |
1182 | * same XID for all retransmits. | |
1183 | */ | |
1184 | static void | |
1185 | call_timeout(struct rpc_task *task) | |
1186 | { | |
1187 | struct rpc_clnt *clnt = task->tk_client; | |
1188 | ||
1189 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1190 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1191 | goto retry; |
1192 | } | |
1193 | ||
46121cf7 | 1194 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1195 | task->tk_timeouts++; |
1196 | ||
1da177e4 | 1197 | if (RPC_IS_SOFT(task)) { |
f518e35a | 1198 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
1199 | clnt->cl_protname, clnt->cl_server); |
1200 | rpc_exit(task, -EIO); | |
1201 | return; | |
1202 | } | |
1203 | ||
f518e35a | 1204 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1205 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1206 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1207 | clnt->cl_protname, clnt->cl_server); | |
1208 | } | |
35f5a422 | 1209 | rpc_force_rebind(clnt); |
1da177e4 LT |
1210 | |
1211 | retry: | |
1212 | clnt->cl_stats->rpcretrans++; | |
1213 | task->tk_action = call_bind; | |
1214 | task->tk_status = 0; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * 7. Decode the RPC reply | |
1219 | */ | |
1220 | static void | |
1221 | call_decode(struct rpc_task *task) | |
1222 | { | |
1223 | struct rpc_clnt *clnt = task->tk_client; | |
1224 | struct rpc_rqst *req = task->tk_rqstp; | |
1225 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1226 | __be32 *p; |
1da177e4 | 1227 | |
46121cf7 CL |
1228 | dprintk("RPC: %5u call_decode (status %d)\n", |
1229 | task->tk_pid, task->tk_status); | |
1da177e4 | 1230 | |
f518e35a | 1231 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1232 | printk(KERN_NOTICE "%s: server %s OK\n", |
1233 | clnt->cl_protname, clnt->cl_server); | |
1234 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1235 | } | |
1236 | ||
1237 | if (task->tk_status < 12) { | |
1238 | if (!RPC_IS_SOFT(task)) { | |
1239 | task->tk_action = call_bind; | |
1240 | clnt->cl_stats->rpcretrans++; | |
1241 | goto out_retry; | |
1242 | } | |
46121cf7 CL |
1243 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
1244 | clnt->cl_protname, task->tk_status); | |
da45828e TM |
1245 | task->tk_action = call_timeout; |
1246 | goto out_retry; | |
1da177e4 LT |
1247 | } |
1248 | ||
43ac3f29 TM |
1249 | /* |
1250 | * Ensure that we see all writes made by xprt_complete_rqst() | |
1251 | * before it changed req->rq_received. | |
1252 | */ | |
1253 | smp_rmb(); | |
1da177e4 LT |
1254 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1255 | ||
1256 | /* Check that the softirq receive buffer is valid */ | |
1257 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1258 | sizeof(req->rq_rcv_buf)) != 0); | |
1259 | ||
1260 | /* Verify the RPC header */ | |
abbcf28f TM |
1261 | p = call_verify(task); |
1262 | if (IS_ERR(p)) { | |
1263 | if (p == ERR_PTR(-EAGAIN)) | |
1264 | goto out_retry; | |
1265 | return; | |
1da177e4 LT |
1266 | } |
1267 | ||
abbcf28f | 1268 | task->tk_action = rpc_exit_task; |
1da177e4 | 1269 | |
6d5fcb5a | 1270 | if (decode) { |
1da177e4 LT |
1271 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1272 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1273 | } |
46121cf7 CL |
1274 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1275 | task->tk_status); | |
1da177e4 LT |
1276 | return; |
1277 | out_retry: | |
1278 | req->rq_received = req->rq_private_buf.len = 0; | |
1279 | task->tk_status = 0; | |
241c39b9 | 1280 | if (task->tk_client->cl_discrtry) |
3ebb067d | 1281 | xprt_force_disconnect(task->tk_xprt); |
1da177e4 LT |
1282 | } |
1283 | ||
1284 | /* | |
1285 | * 8. Refresh the credentials if rejected by the server | |
1286 | */ | |
1287 | static void | |
1288 | call_refresh(struct rpc_task *task) | |
1289 | { | |
46121cf7 | 1290 | dprint_status(task); |
1da177e4 | 1291 | |
1da177e4 LT |
1292 | task->tk_action = call_refreshresult; |
1293 | task->tk_status = 0; | |
1294 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1295 | rpcauth_refreshcred(task); | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * 8a. Process the results of a credential refresh | |
1300 | */ | |
1301 | static void | |
1302 | call_refreshresult(struct rpc_task *task) | |
1303 | { | |
1304 | int status = task->tk_status; | |
46121cf7 CL |
1305 | |
1306 | dprint_status(task); | |
1da177e4 LT |
1307 | |
1308 | task->tk_status = 0; | |
1309 | task->tk_action = call_reserve; | |
1310 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1311 | return; | |
1312 | if (status == -EACCES) { | |
1313 | rpc_exit(task, -EACCES); | |
1314 | return; | |
1315 | } | |
1316 | task->tk_action = call_refresh; | |
1317 | if (status != -ETIMEDOUT) | |
1318 | rpc_delay(task, 3*HZ); | |
1319 | return; | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Call header serialization | |
1324 | */ | |
d8ed029d | 1325 | static __be32 * |
1da177e4 LT |
1326 | call_header(struct rpc_task *task) |
1327 | { | |
1328 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1329 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1330 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1331 | |
1332 | /* FIXME: check buffer size? */ | |
808012fb CL |
1333 | |
1334 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1335 | *p++ = req->rq_xid; /* XID */ |
1336 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1337 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1338 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1339 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1340 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1341 | p = rpcauth_marshcred(task, p); |
1342 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1343 | return p; | |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | /* | |
1347 | * Reply header verification | |
1348 | */ | |
d8ed029d | 1349 | static __be32 * |
1da177e4 LT |
1350 | call_verify(struct rpc_task *task) |
1351 | { | |
1352 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1353 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1354 | __be32 *p = iov->iov_base; |
1355 | u32 n; | |
1da177e4 LT |
1356 | int error = -EACCES; |
1357 | ||
e8896495 DH |
1358 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1359 | /* RFC-1014 says that the representation of XDR data must be a | |
1360 | * multiple of four bytes | |
1361 | * - if it isn't pointer subtraction in the NFS client may give | |
1362 | * undefined results | |
1363 | */ | |
8a702bbb TM |
1364 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
1365 | " 4 bytes: 0x%x\n", task->tk_pid, __FUNCTION__, | |
1366 | task->tk_rqstp->rq_rcv_buf.len); | |
e8896495 DH |
1367 | goto out_eio; |
1368 | } | |
1da177e4 LT |
1369 | if ((len -= 3) < 0) |
1370 | goto out_overflow; | |
1371 | p += 1; /* skip XID */ | |
1372 | ||
1373 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
8a702bbb TM |
1374 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
1375 | task->tk_pid, __FUNCTION__, n); | |
abbcf28f | 1376 | goto out_garbage; |
1da177e4 LT |
1377 | } |
1378 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1379 | if (--len < 0) | |
1380 | goto out_overflow; | |
1381 | switch ((n = ntohl(*p++))) { | |
1382 | case RPC_AUTH_ERROR: | |
1383 | break; | |
1384 | case RPC_MISMATCH: | |
46121cf7 CL |
1385 | dprintk("RPC: %5u %s: RPC call version " |
1386 | "mismatch!\n", | |
1387 | task->tk_pid, __FUNCTION__); | |
cdf47706 AG |
1388 | error = -EPROTONOSUPPORT; |
1389 | goto out_err; | |
1da177e4 | 1390 | default: |
46121cf7 CL |
1391 | dprintk("RPC: %5u %s: RPC call rejected, " |
1392 | "unknown error: %x\n", | |
1393 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1394 | goto out_eio; |
1395 | } | |
1396 | if (--len < 0) | |
1397 | goto out_overflow; | |
1398 | switch ((n = ntohl(*p++))) { | |
1399 | case RPC_AUTH_REJECTEDCRED: | |
1400 | case RPC_AUTH_REJECTEDVERF: | |
1401 | case RPCSEC_GSS_CREDPROBLEM: | |
1402 | case RPCSEC_GSS_CTXPROBLEM: | |
1403 | if (!task->tk_cred_retry) | |
1404 | break; | |
1405 | task->tk_cred_retry--; | |
46121cf7 CL |
1406 | dprintk("RPC: %5u %s: retry stale creds\n", |
1407 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1408 | rpcauth_invalcred(task); |
220bcc2a TM |
1409 | /* Ensure we obtain a new XID! */ |
1410 | xprt_release(task); | |
1da177e4 | 1411 | task->tk_action = call_refresh; |
abbcf28f | 1412 | goto out_retry; |
1da177e4 LT |
1413 | case RPC_AUTH_BADCRED: |
1414 | case RPC_AUTH_BADVERF: | |
1415 | /* possibly garbled cred/verf? */ | |
1416 | if (!task->tk_garb_retry) | |
1417 | break; | |
1418 | task->tk_garb_retry--; | |
46121cf7 CL |
1419 | dprintk("RPC: %5u %s: retry garbled creds\n", |
1420 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1421 | task->tk_action = call_bind; |
abbcf28f | 1422 | goto out_retry; |
1da177e4 | 1423 | case RPC_AUTH_TOOWEAK: |
1356b8c2 LS |
1424 | printk(KERN_NOTICE "call_verify: server %s requires stronger " |
1425 | "authentication.\n", task->tk_client->cl_server); | |
1da177e4 LT |
1426 | break; |
1427 | default: | |
8a702bbb TM |
1428 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
1429 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1430 | error = -EIO; |
1431 | } | |
46121cf7 CL |
1432 | dprintk("RPC: %5u %s: call rejected %d\n", |
1433 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1434 | goto out_err; |
1435 | } | |
1436 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb TM |
1437 | dprintk("RPC: %5u %s: auth check failed\n", |
1438 | task->tk_pid, __FUNCTION__); | |
abbcf28f | 1439 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1440 | } |
d8ed029d | 1441 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1442 | if (len < 0) |
1443 | goto out_overflow; | |
1444 | switch ((n = ntohl(*p++))) { | |
1445 | case RPC_SUCCESS: | |
1446 | return p; | |
1447 | case RPC_PROG_UNAVAIL: | |
46121cf7 CL |
1448 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
1449 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1450 | (unsigned int)task->tk_client->cl_prog, |
1451 | task->tk_client->cl_server); | |
cdf47706 AG |
1452 | error = -EPFNOSUPPORT; |
1453 | goto out_err; | |
1da177e4 | 1454 | case RPC_PROG_MISMATCH: |
46121cf7 CL |
1455 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
1456 | "server %s\n", task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1457 | (unsigned int)task->tk_client->cl_prog, |
1458 | (unsigned int)task->tk_client->cl_vers, | |
1459 | task->tk_client->cl_server); | |
cdf47706 AG |
1460 | error = -EPROTONOSUPPORT; |
1461 | goto out_err; | |
1da177e4 | 1462 | case RPC_PROC_UNAVAIL: |
46121cf7 CL |
1463 | dprintk("RPC: %5u %s: proc %p unsupported by program %u, " |
1464 | "version %u on server %s\n", | |
1465 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1466 | task->tk_msg.rpc_proc, |
1467 | task->tk_client->cl_prog, | |
1468 | task->tk_client->cl_vers, | |
1469 | task->tk_client->cl_server); | |
cdf47706 AG |
1470 | error = -EOPNOTSUPP; |
1471 | goto out_err; | |
1da177e4 | 1472 | case RPC_GARBAGE_ARGS: |
46121cf7 CL |
1473 | dprintk("RPC: %5u %s: server saw garbage\n", |
1474 | task->tk_pid, __FUNCTION__); | |
1da177e4 LT |
1475 | break; /* retry */ |
1476 | default: | |
8a702bbb TM |
1477 | dprintk("RPC: %5u %s: server accept status: %x\n", |
1478 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1479 | /* Also retry */ |
1480 | } | |
1481 | ||
abbcf28f | 1482 | out_garbage: |
1da177e4 LT |
1483 | task->tk_client->cl_stats->rpcgarbage++; |
1484 | if (task->tk_garb_retry) { | |
1485 | task->tk_garb_retry--; | |
46121cf7 CL |
1486 | dprintk("RPC: %5u %s: retrying\n", |
1487 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1488 | task->tk_action = call_bind; |
abbcf28f TM |
1489 | out_retry: |
1490 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 1491 | } |
1da177e4 LT |
1492 | out_eio: |
1493 | error = -EIO; | |
1494 | out_err: | |
1495 | rpc_exit(task, error); | |
8a702bbb TM |
1496 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
1497 | __FUNCTION__, error); | |
abbcf28f | 1498 | return ERR_PTR(error); |
1da177e4 | 1499 | out_overflow: |
8a702bbb TM |
1500 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
1501 | __FUNCTION__); | |
abbcf28f | 1502 | goto out_garbage; |
1da177e4 | 1503 | } |
5ee0ed7d | 1504 | |
d8ed029d | 1505 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1506 | { |
1507 | return 0; | |
1508 | } | |
1509 | ||
d8ed029d | 1510 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1511 | { |
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static struct rpc_procinfo rpcproc_null = { | |
1516 | .p_encode = rpcproc_encode_null, | |
1517 | .p_decode = rpcproc_decode_null, | |
1518 | }; | |
1519 | ||
64c91a1f | 1520 | static int rpc_ping(struct rpc_clnt *clnt, int flags) |
5ee0ed7d TM |
1521 | { |
1522 | struct rpc_message msg = { | |
1523 | .rpc_proc = &rpcproc_null, | |
1524 | }; | |
1525 | int err; | |
1526 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1527 | err = rpc_call_sync(clnt, &msg, flags); | |
1528 | put_rpccred(msg.rpc_cred); | |
1529 | return err; | |
1530 | } | |
188fef11 | 1531 | |
5e1550d6 TM |
1532 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1533 | { | |
1534 | struct rpc_message msg = { | |
1535 | .rpc_proc = &rpcproc_null, | |
1536 | .rpc_cred = cred, | |
1537 | }; | |
84115e1c TM |
1538 | struct rpc_task_setup task_setup_data = { |
1539 | .rpc_client = clnt, | |
1540 | .rpc_message = &msg, | |
1541 | .callback_ops = &rpc_default_ops, | |
1542 | .flags = flags, | |
1543 | }; | |
c970aa85 | 1544 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 1545 | } |
e8914c65 | 1546 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 1547 | |
188fef11 TM |
1548 | #ifdef RPC_DEBUG |
1549 | void rpc_show_tasks(void) | |
1550 | { | |
1551 | struct rpc_clnt *clnt; | |
1552 | struct rpc_task *t; | |
1553 | ||
1554 | spin_lock(&rpc_client_lock); | |
1555 | if (list_empty(&all_clients)) | |
1556 | goto out; | |
1557 | printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout " | |
1558 | "-rpcwait -action- ---ops--\n"); | |
1559 | list_for_each_entry(clnt, &all_clients, cl_clients) { | |
1560 | if (list_empty(&clnt->cl_tasks)) | |
1561 | continue; | |
1562 | spin_lock(&clnt->cl_lock); | |
1563 | list_for_each_entry(t, &clnt->cl_tasks, tk_task) { | |
1564 | const char *rpc_waitq = "none"; | |
d66968f2 CL |
1565 | int proc; |
1566 | ||
1567 | if (t->tk_msg.rpc_proc) | |
1568 | proc = t->tk_msg.rpc_proc->p_proc; | |
1569 | else | |
1570 | proc = -1; | |
188fef11 TM |
1571 | |
1572 | if (RPC_IS_QUEUED(t)) | |
1573 | rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq); | |
1574 | ||
1575 | printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n", | |
d66968f2 | 1576 | t->tk_pid, proc, |
188fef11 TM |
1577 | t->tk_flags, t->tk_status, |
1578 | t->tk_client, | |
1579 | (t->tk_client ? t->tk_client->cl_prog : 0), | |
1580 | t->tk_rqstp, t->tk_timeout, | |
1581 | rpc_waitq, | |
1582 | t->tk_action, t->tk_ops); | |
1583 | } | |
1584 | spin_unlock(&clnt->cl_lock); | |
1585 | } | |
1586 | out: | |
1587 | spin_unlock(&rpc_client_lock); | |
1588 | } | |
1589 | #endif |