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 | ||
188fef11 TM |
47 | /* |
48 | * All RPC clients are linked into this list | |
49 | */ | |
50 | static LIST_HEAD(all_clients); | |
51 | static DEFINE_SPINLOCK(rpc_client_lock); | |
52 | ||
1da177e4 LT |
53 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
54 | ||
55 | ||
56 | static void call_start(struct rpc_task *task); | |
57 | static void call_reserve(struct rpc_task *task); | |
58 | static void call_reserveresult(struct rpc_task *task); | |
59 | static void call_allocate(struct rpc_task *task); | |
60 | static void call_encode(struct rpc_task *task); | |
61 | static void call_decode(struct rpc_task *task); | |
62 | static void call_bind(struct rpc_task *task); | |
da351878 | 63 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
64 | static void call_transmit(struct rpc_task *task); |
65 | static void call_status(struct rpc_task *task); | |
940e3318 | 66 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
67 | static void call_refresh(struct rpc_task *task); |
68 | static void call_refreshresult(struct rpc_task *task); | |
69 | static void call_timeout(struct rpc_task *task); | |
70 | static void call_connect(struct rpc_task *task); | |
71 | static void call_connect_status(struct rpc_task *task); | |
d8ed029d AD |
72 | static __be32 * call_header(struct rpc_task *task); |
73 | static __be32 * call_verify(struct rpc_task *task); | |
1da177e4 | 74 | |
64c91a1f TM |
75 | static int rpc_ping(struct rpc_clnt *clnt, int flags); |
76 | ||
188fef11 TM |
77 | static void rpc_register_client(struct rpc_clnt *clnt) |
78 | { | |
79 | spin_lock(&rpc_client_lock); | |
80 | list_add(&clnt->cl_clients, &all_clients); | |
81 | spin_unlock(&rpc_client_lock); | |
82 | } | |
83 | ||
84 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
85 | { | |
86 | spin_lock(&rpc_client_lock); | |
87 | list_del(&clnt->cl_clients); | |
88 | spin_unlock(&rpc_client_lock); | |
89 | } | |
1da177e4 LT |
90 | |
91 | static int | |
92 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
93 | { | |
f134585a | 94 | static uint32_t clntid; |
1da177e4 LT |
95 | int error; |
96 | ||
54281548 TM |
97 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
98 | clnt->cl_dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
99 | if (dir_name == NULL) |
100 | return 0; | |
54281548 TM |
101 | |
102 | clnt->cl_vfsmnt = rpc_get_mount(); | |
103 | if (IS_ERR(clnt->cl_vfsmnt)) | |
104 | return PTR_ERR(clnt->cl_vfsmnt); | |
105 | ||
f134585a TM |
106 | for (;;) { |
107 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
108 | "%s/clnt%x", dir_name, | |
109 | (unsigned int)clntid++); | |
110 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
111 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
112 | if (!IS_ERR(clnt->cl_dentry)) | |
113 | return 0; | |
1da177e4 | 114 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
115 | if (error != -EEXIST) { |
116 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
117 | clnt->cl_pathname, error); | |
54281548 | 118 | rpc_put_mount(); |
f134585a TM |
119 | return error; |
120 | } | |
1da177e4 LT |
121 | } |
122 | } | |
123 | ||
ff9aa5e5 | 124 | 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 |
125 | { |
126 | struct rpc_version *version; | |
127 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 128 | struct rpc_auth *auth; |
1da177e4 | 129 | int err; |
06b8d255 CL |
130 | size_t len; |
131 | ||
132 | /* sanity check the name before trying to print it */ | |
133 | err = -EINVAL; | |
134 | len = strlen(servname); | |
135 | if (len > RPC_MAXNETNAMELEN) | |
136 | goto out_no_rpciod; | |
137 | len++; | |
1da177e4 | 138 | |
46121cf7 CL |
139 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
140 | program->name, servname, xprt); | |
1da177e4 | 141 | |
4ada539e TM |
142 | err = rpciod_up(); |
143 | if (err) | |
144 | goto out_no_rpciod; | |
1da177e4 LT |
145 | err = -EINVAL; |
146 | if (!xprt) | |
712917d1 | 147 | goto out_no_xprt; |
1da177e4 LT |
148 | if (vers >= program->nrvers || !(version = program->version[vers])) |
149 | goto out_err; | |
150 | ||
151 | err = -ENOMEM; | |
0da974f4 | 152 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
153 | if (!clnt) |
154 | goto out_err; | |
1da177e4 LT |
155 | clnt->cl_parent = clnt; |
156 | ||
157 | clnt->cl_server = clnt->cl_inline_name; | |
1da177e4 LT |
158 | if (len > sizeof(clnt->cl_inline_name)) { |
159 | char *buf = kmalloc(len, GFP_KERNEL); | |
160 | if (buf != 0) | |
161 | clnt->cl_server = buf; | |
162 | else | |
163 | len = sizeof(clnt->cl_inline_name); | |
164 | } | |
165 | strlcpy(clnt->cl_server, servname, len); | |
166 | ||
167 | clnt->cl_xprt = xprt; | |
168 | clnt->cl_procinfo = version->procs; | |
169 | clnt->cl_maxproc = version->nrprocs; | |
170 | clnt->cl_protname = program->name; | |
1da177e4 LT |
171 | clnt->cl_prog = program->number; |
172 | clnt->cl_vers = version->number; | |
1da177e4 | 173 | clnt->cl_stats = program->stats; |
11c556b3 | 174 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
175 | err = -ENOMEM; |
176 | if (clnt->cl_metrics == NULL) | |
177 | goto out_no_stats; | |
3e32a5d9 | 178 | clnt->cl_program = program; |
6529eba0 | 179 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 180 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 181 | |
ec739ef0 | 182 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
183 | clnt->cl_autobind = 1; |
184 | ||
185 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
186 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
187 | ||
34f52e35 TM |
188 | kref_init(&clnt->cl_kref); |
189 | ||
1da177e4 LT |
190 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
191 | if (err < 0) | |
192 | goto out_no_path; | |
193 | ||
6a19275a BF |
194 | auth = rpcauth_create(flavor, clnt); |
195 | if (IS_ERR(auth)) { | |
1da177e4 LT |
196 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
197 | flavor); | |
6a19275a | 198 | err = PTR_ERR(auth); |
1da177e4 LT |
199 | goto out_no_auth; |
200 | } | |
201 | ||
202 | /* save the nodename */ | |
e9ff3990 | 203 | clnt->cl_nodelen = strlen(utsname()->nodename); |
1da177e4 LT |
204 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
205 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
e9ff3990 | 206 | memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen); |
6529eba0 | 207 | rpc_register_client(clnt); |
1da177e4 LT |
208 | return clnt; |
209 | ||
210 | out_no_auth: | |
54281548 | 211 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 212 | rpc_rmdir(clnt->cl_dentry); |
54281548 TM |
213 | rpc_put_mount(); |
214 | } | |
1da177e4 | 215 | out_no_path: |
23bf85ba TM |
216 | rpc_free_iostats(clnt->cl_metrics); |
217 | out_no_stats: | |
1da177e4 LT |
218 | if (clnt->cl_server != clnt->cl_inline_name) |
219 | kfree(clnt->cl_server); | |
220 | kfree(clnt); | |
221 | out_err: | |
6b6ca86b | 222 | xprt_put(xprt); |
712917d1 | 223 | out_no_xprt: |
4ada539e TM |
224 | rpciod_down(); |
225 | out_no_rpciod: | |
1da177e4 LT |
226 | return ERR_PTR(err); |
227 | } | |
228 | ||
c2866763 CL |
229 | /* |
230 | * rpc_create - create an RPC client and transport with one call | |
231 | * @args: rpc_clnt create argument structure | |
232 | * | |
233 | * Creates and initializes an RPC transport and an RPC client. | |
234 | * | |
235 | * It can ping the server in order to determine if it is up, and to see if | |
236 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
237 | * this behavior so asynchronous tasks can also use rpc_create. | |
238 | */ | |
239 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
240 | { | |
241 | struct rpc_xprt *xprt; | |
242 | struct rpc_clnt *clnt; | |
3c341b0b | 243 | struct xprt_create xprtargs = { |
4fa016eb | 244 | .ident = args->protocol, |
d3bc9a1d | 245 | .srcaddr = args->saddress, |
96802a09 FM |
246 | .dstaddr = args->address, |
247 | .addrlen = args->addrsize, | |
248 | .timeout = args->timeout | |
249 | }; | |
43780b87 | 250 | char servername[20]; |
c2866763 | 251 | |
96802a09 | 252 | xprt = xprt_create_transport(&xprtargs); |
c2866763 CL |
253 | if (IS_ERR(xprt)) |
254 | return (struct rpc_clnt *)xprt; | |
255 | ||
43780b87 CL |
256 | /* |
257 | * If the caller chooses not to specify a hostname, whip | |
258 | * up a string representation of the passed-in address. | |
259 | */ | |
260 | if (args->servername == NULL) { | |
261 | struct sockaddr_in *addr = | |
afde94f3 | 262 | (struct sockaddr_in *) args->address; |
43780b87 CL |
263 | snprintf(servername, sizeof(servername), NIPQUAD_FMT, |
264 | NIPQUAD(addr->sin_addr.s_addr)); | |
265 | args->servername = servername; | |
266 | } | |
267 | ||
c2866763 CL |
268 | /* |
269 | * By default, kernel RPC client connects from a reserved port. | |
270 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
271 | * but it is always enabled for rpciod, which handles the connect | |
272 | * operation. | |
273 | */ | |
274 | xprt->resvport = 1; | |
275 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
276 | xprt->resvport = 0; | |
277 | ||
c2866763 CL |
278 | clnt = rpc_new_client(xprt, args->servername, args->program, |
279 | args->version, args->authflavor); | |
280 | if (IS_ERR(clnt)) | |
281 | return clnt; | |
282 | ||
283 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
284 | int err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
285 | if (err != 0) { | |
286 | rpc_shutdown_client(clnt); | |
287 | return ERR_PTR(err); | |
288 | } | |
289 | } | |
290 | ||
291 | clnt->cl_softrtry = 1; | |
292 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
293 | clnt->cl_softrtry = 0; | |
294 | ||
295 | if (args->flags & RPC_CLNT_CREATE_INTR) | |
296 | clnt->cl_intr = 1; | |
297 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
298 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
299 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
300 | clnt->cl_discrtry = 1; | |
c2866763 CL |
301 | |
302 | return clnt; | |
303 | } | |
b86acd50 | 304 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 305 | |
1da177e4 LT |
306 | /* |
307 | * This function clones the RPC client structure. It allows us to share the | |
308 | * same transport while varying parameters such as the authentication | |
309 | * flavour. | |
310 | */ | |
311 | struct rpc_clnt * | |
312 | rpc_clone_client(struct rpc_clnt *clnt) | |
313 | { | |
314 | struct rpc_clnt *new; | |
3e32a5d9 | 315 | int err = -ENOMEM; |
1da177e4 | 316 | |
e69062b4 | 317 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
318 | if (!new) |
319 | goto out_no_clnt; | |
d431a555 TM |
320 | new->cl_parent = clnt; |
321 | /* Turn off autobind on clones */ | |
322 | new->cl_autobind = 0; | |
323 | INIT_LIST_HEAD(&new->cl_tasks); | |
324 | spin_lock_init(&new->cl_lock); | |
325 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); | |
23bf85ba TM |
326 | new->cl_metrics = rpc_alloc_iostats(clnt); |
327 | if (new->cl_metrics == NULL) | |
328 | goto out_no_stats; | |
34f52e35 | 329 | kref_init(&new->cl_kref); |
3e32a5d9 TM |
330 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
331 | if (err != 0) | |
332 | goto out_no_path; | |
1da177e4 LT |
333 | if (new->cl_auth) |
334 | atomic_inc(&new->cl_auth->au_count); | |
d431a555 TM |
335 | xprt_get(clnt->cl_xprt); |
336 | kref_get(&clnt->cl_kref); | |
6529eba0 | 337 | rpc_register_client(new); |
4ada539e | 338 | rpciod_up(); |
1da177e4 | 339 | return new; |
3e32a5d9 TM |
340 | out_no_path: |
341 | rpc_free_iostats(new->cl_metrics); | |
23bf85ba TM |
342 | out_no_stats: |
343 | kfree(new); | |
1da177e4 | 344 | out_no_clnt: |
46121cf7 | 345 | dprintk("RPC: %s: returned error %d\n", __FUNCTION__, err); |
3e32a5d9 | 346 | return ERR_PTR(err); |
1da177e4 | 347 | } |
e8914c65 | 348 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 LT |
349 | |
350 | /* | |
351 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 352 | * requests. |
1da177e4 | 353 | */ |
4c402b40 | 354 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 355 | { |
34f52e35 TM |
356 | dprintk("RPC: shutting down %s client for %s\n", |
357 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 | 358 | |
34f52e35 | 359 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 360 | rpc_killall_tasks(clnt); |
532347e2 | 361 | wait_event_timeout(destroy_wait, |
34f52e35 | 362 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
363 | } |
364 | ||
4c402b40 | 365 | rpc_release_client(clnt); |
1da177e4 | 366 | } |
e8914c65 | 367 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
368 | |
369 | /* | |
34f52e35 | 370 | * Free an RPC client |
1da177e4 | 371 | */ |
34f52e35 TM |
372 | static void |
373 | rpc_free_client(struct kref *kref) | |
1da177e4 | 374 | { |
34f52e35 | 375 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
1da177e4 | 376 | |
46121cf7 | 377 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 | 378 | clnt->cl_protname, clnt->cl_server); |
8f8e7a50 | 379 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 380 | rpc_rmdir(clnt->cl_dentry); |
8f8e7a50 TM |
381 | rpc_put_mount(); |
382 | } | |
3e32a5d9 | 383 | if (clnt->cl_parent != clnt) { |
8ad7c892 | 384 | rpc_release_client(clnt->cl_parent); |
3e32a5d9 TM |
385 | goto out_free; |
386 | } | |
1da177e4 LT |
387 | if (clnt->cl_server != clnt->cl_inline_name) |
388 | kfree(clnt->cl_server); | |
389 | out_free: | |
6529eba0 | 390 | rpc_unregister_client(clnt); |
11c556b3 CL |
391 | rpc_free_iostats(clnt->cl_metrics); |
392 | clnt->cl_metrics = NULL; | |
6b6ca86b | 393 | xprt_put(clnt->cl_xprt); |
4ada539e | 394 | rpciod_down(); |
1da177e4 | 395 | kfree(clnt); |
1da177e4 LT |
396 | } |
397 | ||
1dd17ec6 TM |
398 | /* |
399 | * Free an RPC client | |
400 | */ | |
401 | static void | |
402 | rpc_free_auth(struct kref *kref) | |
403 | { | |
404 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); | |
405 | ||
406 | if (clnt->cl_auth == NULL) { | |
407 | rpc_free_client(kref); | |
408 | return; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
413 | * release remaining GSS contexts. This mechanism ensures | |
414 | * that it can do so safely. | |
415 | */ | |
416 | kref_init(kref); | |
417 | rpcauth_release(clnt->cl_auth); | |
418 | clnt->cl_auth = NULL; | |
419 | kref_put(kref, rpc_free_client); | |
420 | } | |
421 | ||
1da177e4 | 422 | /* |
34f52e35 | 423 | * Release reference to the RPC client |
1da177e4 LT |
424 | */ |
425 | void | |
426 | rpc_release_client(struct rpc_clnt *clnt) | |
427 | { | |
34f52e35 | 428 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 429 | |
34f52e35 TM |
430 | if (list_empty(&clnt->cl_tasks)) |
431 | wake_up(&destroy_wait); | |
1dd17ec6 | 432 | kref_put(&clnt->cl_kref, rpc_free_auth); |
34f52e35 TM |
433 | } |
434 | ||
007e251f AG |
435 | /** |
436 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
437 | * @old - old rpc_client | |
438 | * @program - rpc program to set | |
439 | * @vers - rpc program version | |
440 | * | |
441 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
442 | * of use for enabling different RPC programs to share the same transport. | |
443 | * The Sun NFSv2/v3 ACL protocol can do this. | |
444 | */ | |
445 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
446 | struct rpc_program *program, | |
89eb21c3 | 447 | u32 vers) |
007e251f AG |
448 | { |
449 | struct rpc_clnt *clnt; | |
450 | struct rpc_version *version; | |
451 | int err; | |
452 | ||
453 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
454 | version = program->version[vers]; | |
455 | clnt = rpc_clone_client(old); | |
456 | if (IS_ERR(clnt)) | |
457 | goto out; | |
458 | clnt->cl_procinfo = version->procs; | |
459 | clnt->cl_maxproc = version->nrprocs; | |
460 | clnt->cl_protname = program->name; | |
461 | clnt->cl_prog = program->number; | |
462 | clnt->cl_vers = version->number; | |
463 | clnt->cl_stats = program->stats; | |
464 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
465 | if (err != 0) { | |
466 | rpc_shutdown_client(clnt); | |
467 | clnt = ERR_PTR(err); | |
468 | } | |
cca5172a | 469 | out: |
007e251f AG |
470 | return clnt; |
471 | } | |
e8914c65 | 472 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 473 | |
1da177e4 LT |
474 | /* |
475 | * Default callback for async RPC calls | |
476 | */ | |
477 | static void | |
963d8fe5 | 478 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
479 | { |
480 | } | |
481 | ||
963d8fe5 TM |
482 | static const struct rpc_call_ops rpc_default_ops = { |
483 | .rpc_call_done = rpc_default_callback, | |
484 | }; | |
485 | ||
1da177e4 | 486 | /* |
14b218a8 | 487 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
488 | * sleeps on RPC calls |
489 | */ | |
2bd61579 | 490 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
cca5172a | 491 | |
14b218a8 TM |
492 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
493 | { | |
2bd61579 | 494 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
495 | sigset_t sigmask; |
496 | ||
497 | /* Block all signals except those listed in sigallow */ | |
498 | if (intr) | |
499 | sigallow |= RPC_INTR_SIGNALS; | |
500 | siginitsetinv(&sigmask, sigallow); | |
501 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
502 | } | |
503 | ||
50859259 | 504 | static void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) |
14b218a8 TM |
505 | { |
506 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
507 | } | |
508 | ||
50859259 | 509 | static void rpc_restore_sigmask(sigset_t *oldset) |
14b218a8 TM |
510 | { |
511 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
512 | } | |
513 | ||
1da177e4 LT |
514 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
515 | { | |
14b218a8 | 516 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 | 517 | } |
e8914c65 | 518 | EXPORT_SYMBOL_GPL(rpc_clnt_sigmask); |
1da177e4 LT |
519 | |
520 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
521 | { | |
14b218a8 | 522 | rpc_restore_sigmask(oldset); |
1da177e4 | 523 | } |
e8914c65 | 524 | EXPORT_SYMBOL_GPL(rpc_clnt_sigunmask); |
1da177e4 | 525 | |
c970aa85 TM |
526 | /** |
527 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
528 | * @task_setup_data: pointer to task initialisation data | |
529 | */ | |
530 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 TM |
531 | { |
532 | struct rpc_task *task, *ret; | |
533 | sigset_t oldset; | |
534 | ||
84115e1c | 535 | task = rpc_new_task(task_setup_data); |
6e5b70e9 | 536 | if (task == NULL) { |
84115e1c TM |
537 | rpc_release_calldata(task_setup_data->callback_ops, |
538 | task_setup_data->callback_data); | |
50859259 TM |
539 | ret = ERR_PTR(-ENOMEM); |
540 | goto out; | |
6e5b70e9 TM |
541 | } |
542 | ||
b3ef8b3b TM |
543 | if (task->tk_status != 0) { |
544 | ret = ERR_PTR(task->tk_status); | |
545 | rpc_put_task(task); | |
546 | goto out; | |
6e5b70e9 TM |
547 | } |
548 | atomic_inc(&task->tk_count); | |
50859259 TM |
549 | /* Mask signals on synchronous RPC calls and RPCSEC_GSS upcalls */ |
550 | rpc_task_sigmask(task, &oldset); | |
6e5b70e9 | 551 | rpc_execute(task); |
50859259 | 552 | rpc_restore_sigmask(&oldset); |
6e5b70e9 TM |
553 | ret = task; |
554 | out: | |
6e5b70e9 TM |
555 | return ret; |
556 | } | |
c970aa85 | 557 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
558 | |
559 | /** | |
560 | * rpc_call_sync - Perform a synchronous RPC call | |
561 | * @clnt: pointer to RPC client | |
562 | * @msg: RPC call parameters | |
563 | * @flags: RPC call flags | |
1da177e4 LT |
564 | */ |
565 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
566 | { | |
567 | struct rpc_task *task; | |
84115e1c TM |
568 | struct rpc_task_setup task_setup_data = { |
569 | .rpc_client = clnt, | |
570 | .rpc_message = msg, | |
571 | .callback_ops = &rpc_default_ops, | |
572 | .flags = flags, | |
573 | }; | |
6e5b70e9 | 574 | int status; |
1da177e4 | 575 | |
1da177e4 LT |
576 | BUG_ON(flags & RPC_TASK_ASYNC); |
577 | ||
c970aa85 | 578 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
579 | if (IS_ERR(task)) |
580 | return PTR_ERR(task); | |
e60859ac | 581 | status = task->tk_status; |
bde8f00c | 582 | rpc_put_task(task); |
1da177e4 LT |
583 | return status; |
584 | } | |
e8914c65 | 585 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 586 | |
6e5b70e9 TM |
587 | /** |
588 | * rpc_call_async - Perform an asynchronous RPC call | |
589 | * @clnt: pointer to RPC client | |
590 | * @msg: RPC call parameters | |
591 | * @flags: RPC call flags | |
592 | * @ops: RPC call ops | |
593 | * @data: user call data | |
1da177e4 LT |
594 | */ |
595 | int | |
596 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 597 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
598 | { |
599 | struct rpc_task *task; | |
84115e1c TM |
600 | struct rpc_task_setup task_setup_data = { |
601 | .rpc_client = clnt, | |
602 | .rpc_message = msg, | |
603 | .callback_ops = tk_ops, | |
604 | .callback_data = data, | |
605 | .flags = flags|RPC_TASK_ASYNC, | |
606 | }; | |
1da177e4 | 607 | |
c970aa85 | 608 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
609 | if (IS_ERR(task)) |
610 | return PTR_ERR(task); | |
611 | rpc_put_task(task); | |
612 | return 0; | |
1da177e4 | 613 | } |
e8914c65 | 614 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 615 | |
1da177e4 | 616 | void |
84115e1c | 617 | rpc_call_setup(struct rpc_task *task, const struct rpc_message *msg, int flags) |
1da177e4 LT |
618 | { |
619 | task->tk_msg = *msg; | |
620 | task->tk_flags |= flags; | |
621 | /* Bind the user cred */ | |
622 | if (task->tk_msg.rpc_cred != NULL) | |
623 | rpcauth_holdcred(task); | |
624 | else | |
625 | rpcauth_bindcred(task); | |
626 | ||
627 | if (task->tk_status == 0) | |
628 | task->tk_action = call_start; | |
629 | else | |
abbcf28f | 630 | task->tk_action = rpc_exit_task; |
1da177e4 | 631 | } |
e8914c65 | 632 | EXPORT_SYMBOL_GPL(rpc_call_setup); |
1da177e4 | 633 | |
77de2c59 TM |
634 | void |
635 | rpc_call_start(struct rpc_task *task) | |
636 | { | |
637 | task->tk_action = call_start; | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
640 | ||
ed39440a CL |
641 | /** |
642 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
643 | * @clnt: RPC client structure | |
644 | * @buf: target buffer | |
645 | * @size: length of target buffer | |
646 | * | |
647 | * Returns the number of bytes that are actually in the stored address. | |
648 | */ | |
649 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
650 | { | |
651 | size_t bytes; | |
652 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
653 | ||
654 | bytes = sizeof(xprt->addr); | |
655 | if (bytes > bufsize) | |
656 | bytes = bufsize; | |
657 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 658 | return xprt->addrlen; |
ed39440a | 659 | } |
b86acd50 | 660 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 661 | |
f425eba4 CL |
662 | /** |
663 | * rpc_peeraddr2str - return remote peer address in printable format | |
664 | * @clnt: RPC client structure | |
665 | * @format: address format | |
666 | * | |
667 | */ | |
668 | char *rpc_peeraddr2str(struct rpc_clnt *clnt, enum rpc_display_format_t format) | |
669 | { | |
670 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
671 | |
672 | if (xprt->address_strings[format] != NULL) | |
673 | return xprt->address_strings[format]; | |
674 | else | |
675 | return "unprintable"; | |
f425eba4 | 676 | } |
b86acd50 | 677 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 678 | |
1da177e4 LT |
679 | void |
680 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
681 | { | |
682 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
683 | if (xprt->ops->set_buffer_size) |
684 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 | 685 | } |
e8914c65 | 686 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 LT |
687 | |
688 | /* | |
689 | * Return size of largest payload RPC client can support, in bytes | |
690 | * | |
691 | * For stream transports, this is one RPC record fragment (see RFC | |
692 | * 1831), as we don't support multi-record requests yet. For datagram | |
693 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
694 | * RPC header sizes. | |
695 | */ | |
696 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
697 | { | |
698 | return clnt->cl_xprt->max_payload; | |
699 | } | |
b86acd50 | 700 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 701 | |
35f5a422 CL |
702 | /** |
703 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
704 | * @clnt: client to rebind | |
705 | * | |
706 | */ | |
707 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
708 | { | |
709 | if (clnt->cl_autobind) | |
ec739ef0 | 710 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 711 | } |
b86acd50 | 712 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 713 | |
1da177e4 LT |
714 | /* |
715 | * Restart an (async) RPC call. Usually called from within the | |
716 | * exit handler. | |
717 | */ | |
718 | void | |
719 | rpc_restart_call(struct rpc_task *task) | |
720 | { | |
721 | if (RPC_ASSASSINATED(task)) | |
722 | return; | |
723 | ||
724 | task->tk_action = call_start; | |
725 | } | |
e8914c65 | 726 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 LT |
727 | |
728 | /* | |
729 | * 0. Initial state | |
730 | * | |
731 | * Other FSM states can be visited zero or more times, but | |
732 | * this state is visited exactly once for each RPC. | |
733 | */ | |
734 | static void | |
735 | call_start(struct rpc_task *task) | |
736 | { | |
737 | struct rpc_clnt *clnt = task->tk_client; | |
738 | ||
46121cf7 CL |
739 | dprintk("RPC: %5u call_start %s%d proc %d (%s)\n", task->tk_pid, |
740 | clnt->cl_protname, clnt->cl_vers, | |
741 | task->tk_msg.rpc_proc->p_proc, | |
742 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
1da177e4 LT |
743 | |
744 | /* Increment call count */ | |
745 | task->tk_msg.rpc_proc->p_count++; | |
746 | clnt->cl_stats->rpccnt++; | |
747 | task->tk_action = call_reserve; | |
748 | } | |
749 | ||
750 | /* | |
751 | * 1. Reserve an RPC call slot | |
752 | */ | |
753 | static void | |
754 | call_reserve(struct rpc_task *task) | |
755 | { | |
46121cf7 | 756 | dprint_status(task); |
1da177e4 LT |
757 | |
758 | if (!rpcauth_uptodatecred(task)) { | |
759 | task->tk_action = call_refresh; | |
760 | return; | |
761 | } | |
762 | ||
763 | task->tk_status = 0; | |
764 | task->tk_action = call_reserveresult; | |
765 | xprt_reserve(task); | |
766 | } | |
767 | ||
768 | /* | |
769 | * 1b. Grok the result of xprt_reserve() | |
770 | */ | |
771 | static void | |
772 | call_reserveresult(struct rpc_task *task) | |
773 | { | |
774 | int status = task->tk_status; | |
775 | ||
46121cf7 | 776 | dprint_status(task); |
1da177e4 LT |
777 | |
778 | /* | |
779 | * After a call to xprt_reserve(), we must have either | |
780 | * a request slot or else an error status. | |
781 | */ | |
782 | task->tk_status = 0; | |
783 | if (status >= 0) { | |
784 | if (task->tk_rqstp) { | |
785 | task->tk_action = call_allocate; | |
786 | return; | |
787 | } | |
788 | ||
789 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
790 | __FUNCTION__, status); | |
791 | rpc_exit(task, -EIO); | |
792 | return; | |
793 | } | |
794 | ||
795 | /* | |
796 | * Even though there was an error, we may have acquired | |
797 | * a request slot somehow. Make sure not to leak it. | |
798 | */ | |
799 | if (task->tk_rqstp) { | |
800 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
801 | __FUNCTION__, status); | |
802 | xprt_release(task); | |
803 | } | |
804 | ||
805 | switch (status) { | |
806 | case -EAGAIN: /* woken up; retry */ | |
807 | task->tk_action = call_reserve; | |
808 | return; | |
809 | case -EIO: /* probably a shutdown */ | |
810 | break; | |
811 | default: | |
812 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
813 | __FUNCTION__, status); | |
814 | break; | |
815 | } | |
816 | rpc_exit(task, status); | |
817 | } | |
818 | ||
819 | /* | |
820 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 821 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
822 | */ |
823 | static void | |
824 | call_allocate(struct rpc_task *task) | |
825 | { | |
1be27f36 | 826 | unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; |
02107148 CL |
827 | struct rpc_rqst *req = task->tk_rqstp; |
828 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 829 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 830 | |
46121cf7 CL |
831 | dprint_status(task); |
832 | ||
2bea90d4 | 833 | task->tk_status = 0; |
1da177e4 | 834 | task->tk_action = call_bind; |
2bea90d4 | 835 | |
02107148 | 836 | if (req->rq_buffer) |
1da177e4 LT |
837 | return; |
838 | ||
2bea90d4 CL |
839 | if (proc->p_proc != 0) { |
840 | BUG_ON(proc->p_arglen == 0); | |
841 | if (proc->p_decode != NULL) | |
842 | BUG_ON(proc->p_replen == 0); | |
843 | } | |
1da177e4 | 844 | |
2bea90d4 CL |
845 | /* |
846 | * Calculate the size (in quads) of the RPC call | |
847 | * and reply headers, and convert both values | |
848 | * to byte sizes. | |
849 | */ | |
850 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
851 | req->rq_callsize <<= 2; | |
852 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
853 | req->rq_rcvsize <<= 2; | |
854 | ||
c5a4dd8b CL |
855 | req->rq_buffer = xprt->ops->buf_alloc(task, |
856 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 857 | if (req->rq_buffer != NULL) |
1da177e4 | 858 | return; |
46121cf7 CL |
859 | |
860 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 861 | |
14b218a8 | 862 | if (RPC_IS_ASYNC(task) || !signalled()) { |
b6e9c713 | 863 | task->tk_action = call_allocate; |
1da177e4 LT |
864 | rpc_delay(task, HZ>>4); |
865 | return; | |
866 | } | |
867 | ||
868 | rpc_exit(task, -ERESTARTSYS); | |
869 | } | |
870 | ||
940e3318 TM |
871 | static inline int |
872 | rpc_task_need_encode(struct rpc_task *task) | |
873 | { | |
874 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
875 | } | |
876 | ||
877 | static inline void | |
878 | rpc_task_force_reencode(struct rpc_task *task) | |
879 | { | |
880 | task->tk_rqstp->rq_snd_buf.len = 0; | |
881 | } | |
882 | ||
2bea90d4 CL |
883 | static inline void |
884 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
885 | { | |
886 | buf->head[0].iov_base = start; | |
887 | buf->head[0].iov_len = len; | |
888 | buf->tail[0].iov_len = 0; | |
889 | buf->page_len = 0; | |
4f22ccc3 | 890 | buf->flags = 0; |
2bea90d4 CL |
891 | buf->len = 0; |
892 | buf->buflen = len; | |
893 | } | |
894 | ||
1da177e4 LT |
895 | /* |
896 | * 3. Encode arguments of an RPC call | |
897 | */ | |
898 | static void | |
899 | call_encode(struct rpc_task *task) | |
900 | { | |
1da177e4 | 901 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 902 | kxdrproc_t encode; |
d8ed029d | 903 | __be32 *p; |
1da177e4 | 904 | |
46121cf7 | 905 | dprint_status(task); |
1da177e4 | 906 | |
2bea90d4 CL |
907 | rpc_xdr_buf_init(&req->rq_snd_buf, |
908 | req->rq_buffer, | |
909 | req->rq_callsize); | |
910 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
911 | (char *)req->rq_buffer + req->rq_callsize, | |
912 | req->rq_rcvsize); | |
1da177e4 LT |
913 | |
914 | /* Encode header and provided arguments */ | |
915 | encode = task->tk_msg.rpc_proc->p_encode; | |
916 | if (!(p = call_header(task))) { | |
917 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
918 | rpc_exit(task, -EIO); | |
919 | return; | |
920 | } | |
f3680312 BF |
921 | if (encode == NULL) |
922 | return; | |
923 | ||
924 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
925 | task->tk_msg.rpc_argp); | |
926 | if (task->tk_status == -ENOMEM) { | |
927 | /* XXX: Is this sane? */ | |
928 | rpc_delay(task, 3*HZ); | |
929 | task->tk_status = -EAGAIN; | |
930 | } | |
1da177e4 LT |
931 | } |
932 | ||
933 | /* | |
934 | * 4. Get the server port number if not yet set | |
935 | */ | |
936 | static void | |
937 | call_bind(struct rpc_task *task) | |
938 | { | |
ec739ef0 | 939 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 940 | |
46121cf7 | 941 | dprint_status(task); |
1da177e4 | 942 | |
da351878 | 943 | task->tk_action = call_connect; |
ec739ef0 | 944 | if (!xprt_bound(xprt)) { |
da351878 | 945 | task->tk_action = call_bind_status; |
ec739ef0 | 946 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 947 | xprt->ops->rpcbind(task); |
1da177e4 LT |
948 | } |
949 | } | |
950 | ||
951 | /* | |
da351878 CL |
952 | * 4a. Sort out bind result |
953 | */ | |
954 | static void | |
955 | call_bind_status(struct rpc_task *task) | |
956 | { | |
906462af | 957 | int status = -EIO; |
da351878 CL |
958 | |
959 | if (task->tk_status >= 0) { | |
46121cf7 | 960 | dprint_status(task); |
da351878 CL |
961 | task->tk_status = 0; |
962 | task->tk_action = call_connect; | |
963 | return; | |
964 | } | |
965 | ||
966 | switch (task->tk_status) { | |
2429cbf6 CL |
967 | case -EAGAIN: |
968 | dprintk("RPC: %5u rpcbind waiting for another request " | |
969 | "to finish\n", task->tk_pid); | |
970 | /* avoid busy-waiting here -- could be a network outage. */ | |
971 | rpc_delay(task, 5*HZ); | |
972 | goto retry_timeout; | |
da351878 | 973 | case -EACCES: |
46121cf7 CL |
974 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
975 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
976 | /* fail immediately if this is an RPC ping */ |
977 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
978 | status = -EOPNOTSUPP; | |
979 | break; | |
980 | } | |
ea635a51 | 981 | rpc_delay(task, 3*HZ); |
da45828e | 982 | goto retry_timeout; |
da351878 | 983 | case -ETIMEDOUT: |
46121cf7 | 984 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 985 | task->tk_pid); |
da45828e | 986 | goto retry_timeout; |
da351878 | 987 | case -EPFNOSUPPORT: |
906462af | 988 | /* server doesn't support any rpcbind version we know of */ |
46121cf7 | 989 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
da351878 CL |
990 | task->tk_pid); |
991 | break; | |
992 | case -EPROTONOSUPPORT: | |
00a6e7bb | 993 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 994 | task->tk_pid); |
00a6e7bb CL |
995 | task->tk_status = 0; |
996 | task->tk_action = call_bind; | |
997 | return; | |
da351878 | 998 | default: |
46121cf7 | 999 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1000 | task->tk_pid, -task->tk_status); |
da351878 CL |
1001 | } |
1002 | ||
1003 | rpc_exit(task, status); | |
1004 | return; | |
1005 | ||
da45828e TM |
1006 | retry_timeout: |
1007 | task->tk_action = call_timeout; | |
da351878 CL |
1008 | } |
1009 | ||
1010 | /* | |
1011 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1012 | */ |
1013 | static void | |
1014 | call_connect(struct rpc_task *task) | |
1015 | { | |
da351878 | 1016 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1017 | |
46121cf7 | 1018 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1019 | task->tk_pid, xprt, |
1020 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1021 | |
da351878 CL |
1022 | task->tk_action = call_transmit; |
1023 | if (!xprt_connected(xprt)) { | |
1024 | task->tk_action = call_connect_status; | |
1025 | if (task->tk_status < 0) | |
1026 | return; | |
1027 | xprt_connect(task); | |
1da177e4 | 1028 | } |
1da177e4 LT |
1029 | } |
1030 | ||
1031 | /* | |
da351878 | 1032 | * 4c. Sort out connect result |
1da177e4 LT |
1033 | */ |
1034 | static void | |
1035 | call_connect_status(struct rpc_task *task) | |
1036 | { | |
1037 | struct rpc_clnt *clnt = task->tk_client; | |
1038 | int status = task->tk_status; | |
1039 | ||
46121cf7 | 1040 | dprint_status(task); |
da351878 | 1041 | |
1da177e4 LT |
1042 | task->tk_status = 0; |
1043 | if (status >= 0) { | |
1044 | clnt->cl_stats->netreconn++; | |
1045 | task->tk_action = call_transmit; | |
1046 | return; | |
1047 | } | |
1048 | ||
da351878 | 1049 | /* Something failed: remote service port may have changed */ |
35f5a422 | 1050 | rpc_force_rebind(clnt); |
da351878 | 1051 | |
1da177e4 LT |
1052 | switch (status) { |
1053 | case -ENOTCONN: | |
1da177e4 | 1054 | case -EAGAIN: |
da351878 | 1055 | task->tk_action = call_bind; |
da45828e TM |
1056 | if (!RPC_IS_SOFT(task)) |
1057 | return; | |
1058 | /* if soft mounted, test if we've timed out */ | |
1059 | case -ETIMEDOUT: | |
1060 | task->tk_action = call_timeout; | |
1061 | return; | |
1da177e4 | 1062 | } |
da45828e | 1063 | rpc_exit(task, -EIO); |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | /* | |
1067 | * 5. Transmit the RPC request, and wait for reply | |
1068 | */ | |
1069 | static void | |
1070 | call_transmit(struct rpc_task *task) | |
1071 | { | |
46121cf7 | 1072 | dprint_status(task); |
1da177e4 LT |
1073 | |
1074 | task->tk_action = call_status; | |
1075 | if (task->tk_status < 0) | |
1076 | return; | |
1077 | task->tk_status = xprt_prepare_transmit(task); | |
1078 | if (task->tk_status != 0) | |
1079 | return; | |
e0ab53de | 1080 | task->tk_action = call_transmit_status; |
1da177e4 | 1081 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1082 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1083 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
1da177e4 | 1084 | call_encode(task); |
5e5ce5be TM |
1085 | /* Did the encode result in an error condition? */ |
1086 | if (task->tk_status != 0) | |
e0ab53de | 1087 | return; |
5e5ce5be | 1088 | } |
1da177e4 LT |
1089 | xprt_transmit(task); |
1090 | if (task->tk_status < 0) | |
1091 | return; | |
e0ab53de TM |
1092 | /* |
1093 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1094 | * in order to allow access to the socket to other RPC requests. | |
1095 | */ | |
1096 | call_transmit_status(task); | |
1097 | if (task->tk_msg.rpc_proc->p_decode != NULL) | |
1098 | return; | |
1099 | task->tk_action = rpc_exit_task; | |
1100 | rpc_wake_up_task(task); | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * 5a. Handle cleanup after a transmission | |
1105 | */ | |
1106 | static void | |
1107 | call_transmit_status(struct rpc_task *task) | |
1108 | { | |
1109 | task->tk_action = call_status; | |
1110 | /* | |
1111 | * Special case: if we've been waiting on the socket's write_space() | |
1112 | * callback, then don't call xprt_end_transmit(). | |
1113 | */ | |
1114 | if (task->tk_status == -EAGAIN) | |
1115 | return; | |
1116 | xprt_end_transmit(task); | |
940e3318 | 1117 | rpc_task_force_reencode(task); |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | /* | |
1121 | * 6. Sort out the RPC call status | |
1122 | */ | |
1123 | static void | |
1124 | call_status(struct rpc_task *task) | |
1125 | { | |
1126 | struct rpc_clnt *clnt = task->tk_client; | |
1127 | struct rpc_rqst *req = task->tk_rqstp; | |
1128 | int status; | |
1129 | ||
1130 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
1131 | task->tk_status = req->rq_received; | |
1132 | ||
46121cf7 | 1133 | dprint_status(task); |
1da177e4 LT |
1134 | |
1135 | status = task->tk_status; | |
1136 | if (status >= 0) { | |
1137 | task->tk_action = call_decode; | |
1138 | return; | |
1139 | } | |
1140 | ||
1141 | task->tk_status = 0; | |
1142 | switch(status) { | |
76303992 TM |
1143 | case -EHOSTDOWN: |
1144 | case -EHOSTUNREACH: | |
1145 | case -ENETUNREACH: | |
1146 | /* | |
1147 | * Delay any retries for 3 seconds, then handle as if it | |
1148 | * were a timeout. | |
1149 | */ | |
1150 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1151 | case -ETIMEDOUT: |
1152 | task->tk_action = call_timeout; | |
241c39b9 | 1153 | if (task->tk_client->cl_discrtry) |
3ebb067d | 1154 | xprt_force_disconnect(task->tk_xprt); |
1da177e4 LT |
1155 | break; |
1156 | case -ECONNREFUSED: | |
1157 | case -ENOTCONN: | |
35f5a422 | 1158 | rpc_force_rebind(clnt); |
1da177e4 LT |
1159 | task->tk_action = call_bind; |
1160 | break; | |
1161 | case -EAGAIN: | |
1162 | task->tk_action = call_transmit; | |
1163 | break; | |
1164 | case -EIO: | |
1165 | /* shutdown or soft timeout */ | |
1166 | rpc_exit(task, status); | |
1167 | break; | |
1168 | default: | |
f518e35a | 1169 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
1170 | clnt->cl_protname, -status); |
1171 | rpc_exit(task, status); | |
1da177e4 LT |
1172 | } |
1173 | } | |
1174 | ||
1175 | /* | |
e0ab53de | 1176 | * 6a. Handle RPC timeout |
1da177e4 LT |
1177 | * We do not release the request slot, so we keep using the |
1178 | * same XID for all retransmits. | |
1179 | */ | |
1180 | static void | |
1181 | call_timeout(struct rpc_task *task) | |
1182 | { | |
1183 | struct rpc_clnt *clnt = task->tk_client; | |
1184 | ||
1185 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1186 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1187 | goto retry; |
1188 | } | |
1189 | ||
46121cf7 | 1190 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1191 | task->tk_timeouts++; |
1192 | ||
1da177e4 | 1193 | if (RPC_IS_SOFT(task)) { |
f518e35a | 1194 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
1195 | clnt->cl_protname, clnt->cl_server); |
1196 | rpc_exit(task, -EIO); | |
1197 | return; | |
1198 | } | |
1199 | ||
f518e35a | 1200 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1201 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1202 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1203 | clnt->cl_protname, clnt->cl_server); | |
1204 | } | |
35f5a422 | 1205 | rpc_force_rebind(clnt); |
1da177e4 LT |
1206 | |
1207 | retry: | |
1208 | clnt->cl_stats->rpcretrans++; | |
1209 | task->tk_action = call_bind; | |
1210 | task->tk_status = 0; | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * 7. Decode the RPC reply | |
1215 | */ | |
1216 | static void | |
1217 | call_decode(struct rpc_task *task) | |
1218 | { | |
1219 | struct rpc_clnt *clnt = task->tk_client; | |
1220 | struct rpc_rqst *req = task->tk_rqstp; | |
1221 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1222 | __be32 *p; |
1da177e4 | 1223 | |
46121cf7 CL |
1224 | dprintk("RPC: %5u call_decode (status %d)\n", |
1225 | task->tk_pid, task->tk_status); | |
1da177e4 | 1226 | |
f518e35a | 1227 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1228 | printk(KERN_NOTICE "%s: server %s OK\n", |
1229 | clnt->cl_protname, clnt->cl_server); | |
1230 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1231 | } | |
1232 | ||
1233 | if (task->tk_status < 12) { | |
1234 | if (!RPC_IS_SOFT(task)) { | |
1235 | task->tk_action = call_bind; | |
1236 | clnt->cl_stats->rpcretrans++; | |
1237 | goto out_retry; | |
1238 | } | |
46121cf7 CL |
1239 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
1240 | clnt->cl_protname, task->tk_status); | |
da45828e TM |
1241 | task->tk_action = call_timeout; |
1242 | goto out_retry; | |
1da177e4 LT |
1243 | } |
1244 | ||
43ac3f29 TM |
1245 | /* |
1246 | * Ensure that we see all writes made by xprt_complete_rqst() | |
1247 | * before it changed req->rq_received. | |
1248 | */ | |
1249 | smp_rmb(); | |
1da177e4 LT |
1250 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1251 | ||
1252 | /* Check that the softirq receive buffer is valid */ | |
1253 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1254 | sizeof(req->rq_rcv_buf)) != 0); | |
1255 | ||
1256 | /* Verify the RPC header */ | |
abbcf28f TM |
1257 | p = call_verify(task); |
1258 | if (IS_ERR(p)) { | |
1259 | if (p == ERR_PTR(-EAGAIN)) | |
1260 | goto out_retry; | |
1261 | return; | |
1da177e4 LT |
1262 | } |
1263 | ||
abbcf28f | 1264 | task->tk_action = rpc_exit_task; |
1da177e4 | 1265 | |
6d5fcb5a | 1266 | if (decode) { |
1da177e4 LT |
1267 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1268 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1269 | } |
46121cf7 CL |
1270 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1271 | task->tk_status); | |
1da177e4 LT |
1272 | return; |
1273 | out_retry: | |
1274 | req->rq_received = req->rq_private_buf.len = 0; | |
1275 | task->tk_status = 0; | |
241c39b9 | 1276 | if (task->tk_client->cl_discrtry) |
3ebb067d | 1277 | xprt_force_disconnect(task->tk_xprt); |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | /* | |
1281 | * 8. Refresh the credentials if rejected by the server | |
1282 | */ | |
1283 | static void | |
1284 | call_refresh(struct rpc_task *task) | |
1285 | { | |
46121cf7 | 1286 | dprint_status(task); |
1da177e4 | 1287 | |
1da177e4 LT |
1288 | task->tk_action = call_refreshresult; |
1289 | task->tk_status = 0; | |
1290 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1291 | rpcauth_refreshcred(task); | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * 8a. Process the results of a credential refresh | |
1296 | */ | |
1297 | static void | |
1298 | call_refreshresult(struct rpc_task *task) | |
1299 | { | |
1300 | int status = task->tk_status; | |
46121cf7 CL |
1301 | |
1302 | dprint_status(task); | |
1da177e4 LT |
1303 | |
1304 | task->tk_status = 0; | |
1305 | task->tk_action = call_reserve; | |
1306 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1307 | return; | |
1308 | if (status == -EACCES) { | |
1309 | rpc_exit(task, -EACCES); | |
1310 | return; | |
1311 | } | |
1312 | task->tk_action = call_refresh; | |
1313 | if (status != -ETIMEDOUT) | |
1314 | rpc_delay(task, 3*HZ); | |
1315 | return; | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Call header serialization | |
1320 | */ | |
d8ed029d | 1321 | static __be32 * |
1da177e4 LT |
1322 | call_header(struct rpc_task *task) |
1323 | { | |
1324 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1325 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1326 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1327 | |
1328 | /* FIXME: check buffer size? */ | |
808012fb CL |
1329 | |
1330 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1331 | *p++ = req->rq_xid; /* XID */ |
1332 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1333 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1334 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1335 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1336 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1337 | p = rpcauth_marshcred(task, p); |
1338 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1339 | return p; | |
1da177e4 LT |
1340 | } |
1341 | ||
1342 | /* | |
1343 | * Reply header verification | |
1344 | */ | |
d8ed029d | 1345 | static __be32 * |
1da177e4 LT |
1346 | call_verify(struct rpc_task *task) |
1347 | { | |
1348 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1349 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1350 | __be32 *p = iov->iov_base; |
1351 | u32 n; | |
1da177e4 LT |
1352 | int error = -EACCES; |
1353 | ||
e8896495 DH |
1354 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1355 | /* RFC-1014 says that the representation of XDR data must be a | |
1356 | * multiple of four bytes | |
1357 | * - if it isn't pointer subtraction in the NFS client may give | |
1358 | * undefined results | |
1359 | */ | |
8a702bbb TM |
1360 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
1361 | " 4 bytes: 0x%x\n", task->tk_pid, __FUNCTION__, | |
1362 | task->tk_rqstp->rq_rcv_buf.len); | |
e8896495 DH |
1363 | goto out_eio; |
1364 | } | |
1da177e4 LT |
1365 | if ((len -= 3) < 0) |
1366 | goto out_overflow; | |
1367 | p += 1; /* skip XID */ | |
1368 | ||
1369 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
8a702bbb TM |
1370 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
1371 | task->tk_pid, __FUNCTION__, n); | |
abbcf28f | 1372 | goto out_garbage; |
1da177e4 LT |
1373 | } |
1374 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1375 | if (--len < 0) | |
1376 | goto out_overflow; | |
1377 | switch ((n = ntohl(*p++))) { | |
1378 | case RPC_AUTH_ERROR: | |
1379 | break; | |
1380 | case RPC_MISMATCH: | |
46121cf7 CL |
1381 | dprintk("RPC: %5u %s: RPC call version " |
1382 | "mismatch!\n", | |
1383 | task->tk_pid, __FUNCTION__); | |
cdf47706 AG |
1384 | error = -EPROTONOSUPPORT; |
1385 | goto out_err; | |
1da177e4 | 1386 | default: |
46121cf7 CL |
1387 | dprintk("RPC: %5u %s: RPC call rejected, " |
1388 | "unknown error: %x\n", | |
1389 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1390 | goto out_eio; |
1391 | } | |
1392 | if (--len < 0) | |
1393 | goto out_overflow; | |
1394 | switch ((n = ntohl(*p++))) { | |
1395 | case RPC_AUTH_REJECTEDCRED: | |
1396 | case RPC_AUTH_REJECTEDVERF: | |
1397 | case RPCSEC_GSS_CREDPROBLEM: | |
1398 | case RPCSEC_GSS_CTXPROBLEM: | |
1399 | if (!task->tk_cred_retry) | |
1400 | break; | |
1401 | task->tk_cred_retry--; | |
46121cf7 CL |
1402 | dprintk("RPC: %5u %s: retry stale creds\n", |
1403 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1404 | rpcauth_invalcred(task); |
220bcc2a TM |
1405 | /* Ensure we obtain a new XID! */ |
1406 | xprt_release(task); | |
1da177e4 | 1407 | task->tk_action = call_refresh; |
abbcf28f | 1408 | goto out_retry; |
1da177e4 LT |
1409 | case RPC_AUTH_BADCRED: |
1410 | case RPC_AUTH_BADVERF: | |
1411 | /* possibly garbled cred/verf? */ | |
1412 | if (!task->tk_garb_retry) | |
1413 | break; | |
1414 | task->tk_garb_retry--; | |
46121cf7 CL |
1415 | dprintk("RPC: %5u %s: retry garbled creds\n", |
1416 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1417 | task->tk_action = call_bind; |
abbcf28f | 1418 | goto out_retry; |
1da177e4 | 1419 | case RPC_AUTH_TOOWEAK: |
1356b8c2 LS |
1420 | printk(KERN_NOTICE "call_verify: server %s requires stronger " |
1421 | "authentication.\n", task->tk_client->cl_server); | |
1da177e4 LT |
1422 | break; |
1423 | default: | |
8a702bbb TM |
1424 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
1425 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1426 | error = -EIO; |
1427 | } | |
46121cf7 CL |
1428 | dprintk("RPC: %5u %s: call rejected %d\n", |
1429 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1430 | goto out_err; |
1431 | } | |
1432 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb TM |
1433 | dprintk("RPC: %5u %s: auth check failed\n", |
1434 | task->tk_pid, __FUNCTION__); | |
abbcf28f | 1435 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1436 | } |
d8ed029d | 1437 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1438 | if (len < 0) |
1439 | goto out_overflow; | |
1440 | switch ((n = ntohl(*p++))) { | |
1441 | case RPC_SUCCESS: | |
1442 | return p; | |
1443 | case RPC_PROG_UNAVAIL: | |
46121cf7 CL |
1444 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
1445 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1446 | (unsigned int)task->tk_client->cl_prog, |
1447 | task->tk_client->cl_server); | |
cdf47706 AG |
1448 | error = -EPFNOSUPPORT; |
1449 | goto out_err; | |
1da177e4 | 1450 | case RPC_PROG_MISMATCH: |
46121cf7 CL |
1451 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
1452 | "server %s\n", task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1453 | (unsigned int)task->tk_client->cl_prog, |
1454 | (unsigned int)task->tk_client->cl_vers, | |
1455 | task->tk_client->cl_server); | |
cdf47706 AG |
1456 | error = -EPROTONOSUPPORT; |
1457 | goto out_err; | |
1da177e4 | 1458 | case RPC_PROC_UNAVAIL: |
46121cf7 CL |
1459 | dprintk("RPC: %5u %s: proc %p unsupported by program %u, " |
1460 | "version %u on server %s\n", | |
1461 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1462 | task->tk_msg.rpc_proc, |
1463 | task->tk_client->cl_prog, | |
1464 | task->tk_client->cl_vers, | |
1465 | task->tk_client->cl_server); | |
cdf47706 AG |
1466 | error = -EOPNOTSUPP; |
1467 | goto out_err; | |
1da177e4 | 1468 | case RPC_GARBAGE_ARGS: |
46121cf7 CL |
1469 | dprintk("RPC: %5u %s: server saw garbage\n", |
1470 | task->tk_pid, __FUNCTION__); | |
1da177e4 LT |
1471 | break; /* retry */ |
1472 | default: | |
8a702bbb TM |
1473 | dprintk("RPC: %5u %s: server accept status: %x\n", |
1474 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1475 | /* Also retry */ |
1476 | } | |
1477 | ||
abbcf28f | 1478 | out_garbage: |
1da177e4 LT |
1479 | task->tk_client->cl_stats->rpcgarbage++; |
1480 | if (task->tk_garb_retry) { | |
1481 | task->tk_garb_retry--; | |
46121cf7 CL |
1482 | dprintk("RPC: %5u %s: retrying\n", |
1483 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1484 | task->tk_action = call_bind; |
abbcf28f TM |
1485 | out_retry: |
1486 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 1487 | } |
1da177e4 LT |
1488 | out_eio: |
1489 | error = -EIO; | |
1490 | out_err: | |
1491 | rpc_exit(task, error); | |
8a702bbb TM |
1492 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
1493 | __FUNCTION__, error); | |
abbcf28f | 1494 | return ERR_PTR(error); |
1da177e4 | 1495 | out_overflow: |
8a702bbb TM |
1496 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
1497 | __FUNCTION__); | |
abbcf28f | 1498 | goto out_garbage; |
1da177e4 | 1499 | } |
5ee0ed7d | 1500 | |
d8ed029d | 1501 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1502 | { |
1503 | return 0; | |
1504 | } | |
1505 | ||
d8ed029d | 1506 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1507 | { |
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | static struct rpc_procinfo rpcproc_null = { | |
1512 | .p_encode = rpcproc_encode_null, | |
1513 | .p_decode = rpcproc_decode_null, | |
1514 | }; | |
1515 | ||
64c91a1f | 1516 | static int rpc_ping(struct rpc_clnt *clnt, int flags) |
5ee0ed7d TM |
1517 | { |
1518 | struct rpc_message msg = { | |
1519 | .rpc_proc = &rpcproc_null, | |
1520 | }; | |
1521 | int err; | |
1522 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1523 | err = rpc_call_sync(clnt, &msg, flags); | |
1524 | put_rpccred(msg.rpc_cred); | |
1525 | return err; | |
1526 | } | |
188fef11 | 1527 | |
5e1550d6 TM |
1528 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1529 | { | |
1530 | struct rpc_message msg = { | |
1531 | .rpc_proc = &rpcproc_null, | |
1532 | .rpc_cred = cred, | |
1533 | }; | |
84115e1c TM |
1534 | struct rpc_task_setup task_setup_data = { |
1535 | .rpc_client = clnt, | |
1536 | .rpc_message = &msg, | |
1537 | .callback_ops = &rpc_default_ops, | |
1538 | .flags = flags, | |
1539 | }; | |
c970aa85 | 1540 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 1541 | } |
e8914c65 | 1542 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 1543 | |
188fef11 TM |
1544 | #ifdef RPC_DEBUG |
1545 | void rpc_show_tasks(void) | |
1546 | { | |
1547 | struct rpc_clnt *clnt; | |
1548 | struct rpc_task *t; | |
1549 | ||
1550 | spin_lock(&rpc_client_lock); | |
1551 | if (list_empty(&all_clients)) | |
1552 | goto out; | |
1553 | printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout " | |
1554 | "-rpcwait -action- ---ops--\n"); | |
1555 | list_for_each_entry(clnt, &all_clients, cl_clients) { | |
1556 | if (list_empty(&clnt->cl_tasks)) | |
1557 | continue; | |
1558 | spin_lock(&clnt->cl_lock); | |
1559 | list_for_each_entry(t, &clnt->cl_tasks, tk_task) { | |
1560 | const char *rpc_waitq = "none"; | |
d66968f2 CL |
1561 | int proc; |
1562 | ||
1563 | if (t->tk_msg.rpc_proc) | |
1564 | proc = t->tk_msg.rpc_proc->p_proc; | |
1565 | else | |
1566 | proc = -1; | |
188fef11 TM |
1567 | |
1568 | if (RPC_IS_QUEUED(t)) | |
1569 | rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq); | |
1570 | ||
1571 | printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n", | |
d66968f2 | 1572 | t->tk_pid, proc, |
188fef11 TM |
1573 | t->tk_flags, t->tk_status, |
1574 | t->tk_client, | |
1575 | (t->tk_client ? t->tk_client->cl_prog : 0), | |
1576 | t->tk_rqstp, t->tk_timeout, | |
1577 | rpc_waitq, | |
1578 | t->tk_action, t->tk_ops); | |
1579 | } | |
1580 | spin_unlock(&clnt->cl_lock); | |
1581 | } | |
1582 | out: | |
1583 | spin_unlock(&rpc_client_lock); | |
1584 | } | |
1585 | #endif |