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 | ||
698b6d08 | 125 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 126 | { |
698b6d08 | 127 | struct rpc_program *program = args->program; |
1da177e4 LT |
128 | struct rpc_version *version; |
129 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 130 | struct rpc_auth *auth; |
1da177e4 | 131 | int err; |
06b8d255 CL |
132 | size_t len; |
133 | ||
134 | /* sanity check the name before trying to print it */ | |
135 | err = -EINVAL; | |
698b6d08 | 136 | len = strlen(args->servername); |
06b8d255 CL |
137 | if (len > RPC_MAXNETNAMELEN) |
138 | goto out_no_rpciod; | |
139 | len++; | |
1da177e4 | 140 | |
46121cf7 | 141 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 142 | program->name, args->servername, xprt); |
1da177e4 | 143 | |
4ada539e TM |
144 | err = rpciod_up(); |
145 | if (err) | |
146 | goto out_no_rpciod; | |
1da177e4 LT |
147 | err = -EINVAL; |
148 | if (!xprt) | |
712917d1 | 149 | goto out_no_xprt; |
698b6d08 TM |
150 | |
151 | if (args->version >= program->nrvers) | |
152 | goto out_err; | |
153 | version = program->version[args->version]; | |
154 | if (version == NULL) | |
1da177e4 LT |
155 | goto out_err; |
156 | ||
157 | err = -ENOMEM; | |
0da974f4 | 158 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
159 | if (!clnt) |
160 | goto out_err; | |
1da177e4 LT |
161 | clnt->cl_parent = clnt; |
162 | ||
163 | clnt->cl_server = clnt->cl_inline_name; | |
1da177e4 LT |
164 | if (len > sizeof(clnt->cl_inline_name)) { |
165 | char *buf = kmalloc(len, GFP_KERNEL); | |
698b6d08 | 166 | if (buf != NULL) |
1da177e4 LT |
167 | clnt->cl_server = buf; |
168 | else | |
169 | len = sizeof(clnt->cl_inline_name); | |
170 | } | |
698b6d08 | 171 | strlcpy(clnt->cl_server, args->servername, len); |
1da177e4 LT |
172 | |
173 | clnt->cl_xprt = xprt; | |
174 | clnt->cl_procinfo = version->procs; | |
175 | clnt->cl_maxproc = version->nrprocs; | |
176 | clnt->cl_protname = program->name; | |
1da177e4 LT |
177 | clnt->cl_prog = program->number; |
178 | clnt->cl_vers = version->number; | |
1da177e4 | 179 | clnt->cl_stats = program->stats; |
11c556b3 | 180 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
181 | err = -ENOMEM; |
182 | if (clnt->cl_metrics == NULL) | |
183 | goto out_no_stats; | |
3e32a5d9 | 184 | clnt->cl_program = program; |
6529eba0 | 185 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 186 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 187 | |
ec739ef0 | 188 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
189 | clnt->cl_autobind = 1; |
190 | ||
191 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
192 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
193 | ||
34f52e35 TM |
194 | kref_init(&clnt->cl_kref); |
195 | ||
1da177e4 LT |
196 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
197 | if (err < 0) | |
198 | goto out_no_path; | |
199 | ||
698b6d08 | 200 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 201 | if (IS_ERR(auth)) { |
1da177e4 | 202 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 203 | args->authflavor); |
6a19275a | 204 | err = PTR_ERR(auth); |
1da177e4 LT |
205 | goto out_no_auth; |
206 | } | |
207 | ||
208 | /* save the nodename */ | |
e9ff3990 | 209 | clnt->cl_nodelen = strlen(utsname()->nodename); |
1da177e4 LT |
210 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
211 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
e9ff3990 | 212 | memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen); |
6529eba0 | 213 | rpc_register_client(clnt); |
1da177e4 LT |
214 | return clnt; |
215 | ||
216 | out_no_auth: | |
54281548 | 217 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 218 | rpc_rmdir(clnt->cl_dentry); |
54281548 TM |
219 | rpc_put_mount(); |
220 | } | |
1da177e4 | 221 | out_no_path: |
23bf85ba TM |
222 | rpc_free_iostats(clnt->cl_metrics); |
223 | out_no_stats: | |
1da177e4 LT |
224 | if (clnt->cl_server != clnt->cl_inline_name) |
225 | kfree(clnt->cl_server); | |
226 | kfree(clnt); | |
227 | out_err: | |
6b6ca86b | 228 | xprt_put(xprt); |
712917d1 | 229 | out_no_xprt: |
4ada539e TM |
230 | rpciod_down(); |
231 | out_no_rpciod: | |
1da177e4 LT |
232 | return ERR_PTR(err); |
233 | } | |
234 | ||
c2866763 CL |
235 | /* |
236 | * rpc_create - create an RPC client and transport with one call | |
237 | * @args: rpc_clnt create argument structure | |
238 | * | |
239 | * Creates and initializes an RPC transport and an RPC client. | |
240 | * | |
241 | * It can ping the server in order to determine if it is up, and to see if | |
242 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
243 | * this behavior so asynchronous tasks can also use rpc_create. | |
244 | */ | |
245 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
246 | { | |
247 | struct rpc_xprt *xprt; | |
248 | struct rpc_clnt *clnt; | |
3c341b0b | 249 | struct xprt_create xprtargs = { |
4fa016eb | 250 | .ident = args->protocol, |
d3bc9a1d | 251 | .srcaddr = args->saddress, |
96802a09 FM |
252 | .dstaddr = args->address, |
253 | .addrlen = args->addrsize, | |
254 | .timeout = args->timeout | |
255 | }; | |
510deb0d | 256 | char servername[48]; |
c2866763 | 257 | |
96802a09 | 258 | xprt = xprt_create_transport(&xprtargs); |
c2866763 CL |
259 | if (IS_ERR(xprt)) |
260 | return (struct rpc_clnt *)xprt; | |
261 | ||
43780b87 CL |
262 | /* |
263 | * If the caller chooses not to specify a hostname, whip | |
264 | * up a string representation of the passed-in address. | |
265 | */ | |
266 | if (args->servername == NULL) { | |
510deb0d CL |
267 | servername[0] = '\0'; |
268 | switch (args->address->sa_family) { | |
269 | case AF_INET: { | |
270 | struct sockaddr_in *sin = | |
271 | (struct sockaddr_in *)args->address; | |
272 | snprintf(servername, sizeof(servername), NIPQUAD_FMT, | |
273 | NIPQUAD(sin->sin_addr.s_addr)); | |
274 | break; | |
275 | } | |
276 | case AF_INET6: { | |
277 | struct sockaddr_in6 *sin = | |
278 | (struct sockaddr_in6 *)args->address; | |
279 | snprintf(servername, sizeof(servername), NIP6_FMT, | |
280 | NIP6(sin->sin6_addr)); | |
281 | break; | |
282 | } | |
283 | default: | |
284 | /* caller wants default server name, but | |
285 | * address family isn't recognized. */ | |
286 | return ERR_PTR(-EINVAL); | |
287 | } | |
43780b87 CL |
288 | args->servername = servername; |
289 | } | |
290 | ||
510deb0d CL |
291 | xprt = xprt_create_transport(&xprtargs); |
292 | if (IS_ERR(xprt)) | |
293 | return (struct rpc_clnt *)xprt; | |
294 | ||
c2866763 CL |
295 | /* |
296 | * By default, kernel RPC client connects from a reserved port. | |
297 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
298 | * but it is always enabled for rpciod, which handles the connect | |
299 | * operation. | |
300 | */ | |
301 | xprt->resvport = 1; | |
302 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
303 | xprt->resvport = 0; | |
304 | ||
698b6d08 | 305 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
306 | if (IS_ERR(clnt)) |
307 | return clnt; | |
308 | ||
309 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
310 | int err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
311 | if (err != 0) { | |
312 | rpc_shutdown_client(clnt); | |
313 | return ERR_PTR(err); | |
314 | } | |
315 | } | |
316 | ||
317 | clnt->cl_softrtry = 1; | |
318 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
319 | clnt->cl_softrtry = 0; | |
320 | ||
321 | if (args->flags & RPC_CLNT_CREATE_INTR) | |
322 | clnt->cl_intr = 1; | |
323 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
324 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
325 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
326 | clnt->cl_discrtry = 1; | |
c2866763 CL |
327 | |
328 | return clnt; | |
329 | } | |
b86acd50 | 330 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 331 | |
1da177e4 LT |
332 | /* |
333 | * This function clones the RPC client structure. It allows us to share the | |
334 | * same transport while varying parameters such as the authentication | |
335 | * flavour. | |
336 | */ | |
337 | struct rpc_clnt * | |
338 | rpc_clone_client(struct rpc_clnt *clnt) | |
339 | { | |
340 | struct rpc_clnt *new; | |
3e32a5d9 | 341 | int err = -ENOMEM; |
1da177e4 | 342 | |
e69062b4 | 343 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
344 | if (!new) |
345 | goto out_no_clnt; | |
d431a555 TM |
346 | new->cl_parent = clnt; |
347 | /* Turn off autobind on clones */ | |
348 | new->cl_autobind = 0; | |
349 | INIT_LIST_HEAD(&new->cl_tasks); | |
350 | spin_lock_init(&new->cl_lock); | |
351 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); | |
23bf85ba TM |
352 | new->cl_metrics = rpc_alloc_iostats(clnt); |
353 | if (new->cl_metrics == NULL) | |
354 | goto out_no_stats; | |
34f52e35 | 355 | kref_init(&new->cl_kref); |
3e32a5d9 TM |
356 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
357 | if (err != 0) | |
358 | goto out_no_path; | |
1da177e4 LT |
359 | if (new->cl_auth) |
360 | atomic_inc(&new->cl_auth->au_count); | |
d431a555 TM |
361 | xprt_get(clnt->cl_xprt); |
362 | kref_get(&clnt->cl_kref); | |
6529eba0 | 363 | rpc_register_client(new); |
4ada539e | 364 | rpciod_up(); |
1da177e4 | 365 | return new; |
3e32a5d9 TM |
366 | out_no_path: |
367 | rpc_free_iostats(new->cl_metrics); | |
23bf85ba TM |
368 | out_no_stats: |
369 | kfree(new); | |
1da177e4 | 370 | out_no_clnt: |
46121cf7 | 371 | dprintk("RPC: %s: returned error %d\n", __FUNCTION__, err); |
3e32a5d9 | 372 | return ERR_PTR(err); |
1da177e4 | 373 | } |
e8914c65 | 374 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 LT |
375 | |
376 | /* | |
377 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 378 | * requests. |
1da177e4 | 379 | */ |
4c402b40 | 380 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 381 | { |
34f52e35 TM |
382 | dprintk("RPC: shutting down %s client for %s\n", |
383 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 | 384 | |
34f52e35 | 385 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 386 | rpc_killall_tasks(clnt); |
532347e2 | 387 | wait_event_timeout(destroy_wait, |
34f52e35 | 388 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
389 | } |
390 | ||
4c402b40 | 391 | rpc_release_client(clnt); |
1da177e4 | 392 | } |
e8914c65 | 393 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
394 | |
395 | /* | |
34f52e35 | 396 | * Free an RPC client |
1da177e4 | 397 | */ |
34f52e35 TM |
398 | static void |
399 | rpc_free_client(struct kref *kref) | |
1da177e4 | 400 | { |
34f52e35 | 401 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
1da177e4 | 402 | |
46121cf7 | 403 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 | 404 | clnt->cl_protname, clnt->cl_server); |
8f8e7a50 | 405 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 406 | rpc_rmdir(clnt->cl_dentry); |
8f8e7a50 TM |
407 | rpc_put_mount(); |
408 | } | |
3e32a5d9 | 409 | if (clnt->cl_parent != clnt) { |
8ad7c892 | 410 | rpc_release_client(clnt->cl_parent); |
3e32a5d9 TM |
411 | goto out_free; |
412 | } | |
1da177e4 LT |
413 | if (clnt->cl_server != clnt->cl_inline_name) |
414 | kfree(clnt->cl_server); | |
415 | out_free: | |
6529eba0 | 416 | rpc_unregister_client(clnt); |
11c556b3 CL |
417 | rpc_free_iostats(clnt->cl_metrics); |
418 | clnt->cl_metrics = NULL; | |
6b6ca86b | 419 | xprt_put(clnt->cl_xprt); |
4ada539e | 420 | rpciod_down(); |
1da177e4 | 421 | kfree(clnt); |
1da177e4 LT |
422 | } |
423 | ||
1dd17ec6 TM |
424 | /* |
425 | * Free an RPC client | |
426 | */ | |
427 | static void | |
428 | rpc_free_auth(struct kref *kref) | |
429 | { | |
430 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); | |
431 | ||
432 | if (clnt->cl_auth == NULL) { | |
433 | rpc_free_client(kref); | |
434 | return; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
439 | * release remaining GSS contexts. This mechanism ensures | |
440 | * that it can do so safely. | |
441 | */ | |
442 | kref_init(kref); | |
443 | rpcauth_release(clnt->cl_auth); | |
444 | clnt->cl_auth = NULL; | |
445 | kref_put(kref, rpc_free_client); | |
446 | } | |
447 | ||
1da177e4 | 448 | /* |
34f52e35 | 449 | * Release reference to the RPC client |
1da177e4 LT |
450 | */ |
451 | void | |
452 | rpc_release_client(struct rpc_clnt *clnt) | |
453 | { | |
34f52e35 | 454 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 455 | |
34f52e35 TM |
456 | if (list_empty(&clnt->cl_tasks)) |
457 | wake_up(&destroy_wait); | |
1dd17ec6 | 458 | kref_put(&clnt->cl_kref, rpc_free_auth); |
34f52e35 TM |
459 | } |
460 | ||
007e251f AG |
461 | /** |
462 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
463 | * @old - old rpc_client | |
464 | * @program - rpc program to set | |
465 | * @vers - rpc program version | |
466 | * | |
467 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
468 | * of use for enabling different RPC programs to share the same transport. | |
469 | * The Sun NFSv2/v3 ACL protocol can do this. | |
470 | */ | |
471 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
472 | struct rpc_program *program, | |
89eb21c3 | 473 | u32 vers) |
007e251f AG |
474 | { |
475 | struct rpc_clnt *clnt; | |
476 | struct rpc_version *version; | |
477 | int err; | |
478 | ||
479 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
480 | version = program->version[vers]; | |
481 | clnt = rpc_clone_client(old); | |
482 | if (IS_ERR(clnt)) | |
483 | goto out; | |
484 | clnt->cl_procinfo = version->procs; | |
485 | clnt->cl_maxproc = version->nrprocs; | |
486 | clnt->cl_protname = program->name; | |
487 | clnt->cl_prog = program->number; | |
488 | clnt->cl_vers = version->number; | |
489 | clnt->cl_stats = program->stats; | |
490 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
491 | if (err != 0) { | |
492 | rpc_shutdown_client(clnt); | |
493 | clnt = ERR_PTR(err); | |
494 | } | |
cca5172a | 495 | out: |
007e251f AG |
496 | return clnt; |
497 | } | |
e8914c65 | 498 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 499 | |
1da177e4 LT |
500 | /* |
501 | * Default callback for async RPC calls | |
502 | */ | |
503 | static void | |
963d8fe5 | 504 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
505 | { |
506 | } | |
507 | ||
963d8fe5 TM |
508 | static const struct rpc_call_ops rpc_default_ops = { |
509 | .rpc_call_done = rpc_default_callback, | |
510 | }; | |
511 | ||
1da177e4 | 512 | /* |
14b218a8 | 513 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
514 | * sleeps on RPC calls |
515 | */ | |
2bd61579 | 516 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
cca5172a | 517 | |
14b218a8 TM |
518 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
519 | { | |
2bd61579 | 520 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
521 | sigset_t sigmask; |
522 | ||
523 | /* Block all signals except those listed in sigallow */ | |
524 | if (intr) | |
525 | sigallow |= RPC_INTR_SIGNALS; | |
526 | siginitsetinv(&sigmask, sigallow); | |
527 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
528 | } | |
529 | ||
50859259 | 530 | static void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) |
14b218a8 TM |
531 | { |
532 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
533 | } | |
534 | ||
50859259 | 535 | static void rpc_restore_sigmask(sigset_t *oldset) |
14b218a8 TM |
536 | { |
537 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
538 | } | |
539 | ||
1da177e4 LT |
540 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
541 | { | |
14b218a8 | 542 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 | 543 | } |
e8914c65 | 544 | EXPORT_SYMBOL_GPL(rpc_clnt_sigmask); |
1da177e4 LT |
545 | |
546 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
547 | { | |
14b218a8 | 548 | rpc_restore_sigmask(oldset); |
1da177e4 | 549 | } |
e8914c65 | 550 | EXPORT_SYMBOL_GPL(rpc_clnt_sigunmask); |
1da177e4 | 551 | |
c970aa85 TM |
552 | /** |
553 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
554 | * @task_setup_data: pointer to task initialisation data | |
555 | */ | |
556 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 TM |
557 | { |
558 | struct rpc_task *task, *ret; | |
559 | sigset_t oldset; | |
560 | ||
84115e1c | 561 | task = rpc_new_task(task_setup_data); |
6e5b70e9 | 562 | if (task == NULL) { |
84115e1c TM |
563 | rpc_release_calldata(task_setup_data->callback_ops, |
564 | task_setup_data->callback_data); | |
50859259 TM |
565 | ret = ERR_PTR(-ENOMEM); |
566 | goto out; | |
6e5b70e9 TM |
567 | } |
568 | ||
b3ef8b3b TM |
569 | if (task->tk_status != 0) { |
570 | ret = ERR_PTR(task->tk_status); | |
571 | rpc_put_task(task); | |
572 | goto out; | |
6e5b70e9 TM |
573 | } |
574 | atomic_inc(&task->tk_count); | |
50859259 TM |
575 | /* Mask signals on synchronous RPC calls and RPCSEC_GSS upcalls */ |
576 | rpc_task_sigmask(task, &oldset); | |
6e5b70e9 | 577 | rpc_execute(task); |
50859259 | 578 | rpc_restore_sigmask(&oldset); |
6e5b70e9 TM |
579 | ret = task; |
580 | out: | |
6e5b70e9 TM |
581 | return ret; |
582 | } | |
c970aa85 | 583 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
584 | |
585 | /** | |
586 | * rpc_call_sync - Perform a synchronous RPC call | |
587 | * @clnt: pointer to RPC client | |
588 | * @msg: RPC call parameters | |
589 | * @flags: RPC call flags | |
1da177e4 LT |
590 | */ |
591 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
592 | { | |
593 | struct rpc_task *task; | |
84115e1c TM |
594 | struct rpc_task_setup task_setup_data = { |
595 | .rpc_client = clnt, | |
596 | .rpc_message = msg, | |
597 | .callback_ops = &rpc_default_ops, | |
598 | .flags = flags, | |
599 | }; | |
6e5b70e9 | 600 | int status; |
1da177e4 | 601 | |
1da177e4 LT |
602 | BUG_ON(flags & RPC_TASK_ASYNC); |
603 | ||
c970aa85 | 604 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
605 | if (IS_ERR(task)) |
606 | return PTR_ERR(task); | |
e60859ac | 607 | status = task->tk_status; |
bde8f00c | 608 | rpc_put_task(task); |
1da177e4 LT |
609 | return status; |
610 | } | |
e8914c65 | 611 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 612 | |
6e5b70e9 TM |
613 | /** |
614 | * rpc_call_async - Perform an asynchronous RPC call | |
615 | * @clnt: pointer to RPC client | |
616 | * @msg: RPC call parameters | |
617 | * @flags: RPC call flags | |
618 | * @ops: RPC call ops | |
619 | * @data: user call data | |
1da177e4 LT |
620 | */ |
621 | int | |
622 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 623 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
624 | { |
625 | struct rpc_task *task; | |
84115e1c TM |
626 | struct rpc_task_setup task_setup_data = { |
627 | .rpc_client = clnt, | |
628 | .rpc_message = msg, | |
629 | .callback_ops = tk_ops, | |
630 | .callback_data = data, | |
631 | .flags = flags|RPC_TASK_ASYNC, | |
632 | }; | |
1da177e4 | 633 | |
c970aa85 | 634 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
635 | if (IS_ERR(task)) |
636 | return PTR_ERR(task); | |
637 | rpc_put_task(task); | |
638 | return 0; | |
1da177e4 | 639 | } |
e8914c65 | 640 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 641 | |
77de2c59 TM |
642 | void |
643 | rpc_call_start(struct rpc_task *task) | |
644 | { | |
645 | task->tk_action = call_start; | |
646 | } | |
647 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
648 | ||
ed39440a CL |
649 | /** |
650 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
651 | * @clnt: RPC client structure | |
652 | * @buf: target buffer | |
653 | * @size: length of target buffer | |
654 | * | |
655 | * Returns the number of bytes that are actually in the stored address. | |
656 | */ | |
657 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
658 | { | |
659 | size_t bytes; | |
660 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
661 | ||
662 | bytes = sizeof(xprt->addr); | |
663 | if (bytes > bufsize) | |
664 | bytes = bufsize; | |
665 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 666 | return xprt->addrlen; |
ed39440a | 667 | } |
b86acd50 | 668 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 669 | |
f425eba4 CL |
670 | /** |
671 | * rpc_peeraddr2str - return remote peer address in printable format | |
672 | * @clnt: RPC client structure | |
673 | * @format: address format | |
674 | * | |
675 | */ | |
676 | char *rpc_peeraddr2str(struct rpc_clnt *clnt, enum rpc_display_format_t format) | |
677 | { | |
678 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
679 | |
680 | if (xprt->address_strings[format] != NULL) | |
681 | return xprt->address_strings[format]; | |
682 | else | |
683 | return "unprintable"; | |
f425eba4 | 684 | } |
b86acd50 | 685 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 686 | |
1da177e4 LT |
687 | void |
688 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
689 | { | |
690 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
691 | if (xprt->ops->set_buffer_size) |
692 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 | 693 | } |
e8914c65 | 694 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 LT |
695 | |
696 | /* | |
697 | * Return size of largest payload RPC client can support, in bytes | |
698 | * | |
699 | * For stream transports, this is one RPC record fragment (see RFC | |
700 | * 1831), as we don't support multi-record requests yet. For datagram | |
701 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
702 | * RPC header sizes. | |
703 | */ | |
704 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
705 | { | |
706 | return clnt->cl_xprt->max_payload; | |
707 | } | |
b86acd50 | 708 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 709 | |
35f5a422 CL |
710 | /** |
711 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
712 | * @clnt: client to rebind | |
713 | * | |
714 | */ | |
715 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
716 | { | |
717 | if (clnt->cl_autobind) | |
ec739ef0 | 718 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 719 | } |
b86acd50 | 720 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 721 | |
1da177e4 LT |
722 | /* |
723 | * Restart an (async) RPC call. Usually called from within the | |
724 | * exit handler. | |
725 | */ | |
726 | void | |
727 | rpc_restart_call(struct rpc_task *task) | |
728 | { | |
729 | if (RPC_ASSASSINATED(task)) | |
730 | return; | |
731 | ||
732 | task->tk_action = call_start; | |
733 | } | |
e8914c65 | 734 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 LT |
735 | |
736 | /* | |
737 | * 0. Initial state | |
738 | * | |
739 | * Other FSM states can be visited zero or more times, but | |
740 | * this state is visited exactly once for each RPC. | |
741 | */ | |
742 | static void | |
743 | call_start(struct rpc_task *task) | |
744 | { | |
745 | struct rpc_clnt *clnt = task->tk_client; | |
746 | ||
46121cf7 CL |
747 | dprintk("RPC: %5u call_start %s%d proc %d (%s)\n", task->tk_pid, |
748 | clnt->cl_protname, clnt->cl_vers, | |
749 | task->tk_msg.rpc_proc->p_proc, | |
750 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
1da177e4 LT |
751 | |
752 | /* Increment call count */ | |
753 | task->tk_msg.rpc_proc->p_count++; | |
754 | clnt->cl_stats->rpccnt++; | |
755 | task->tk_action = call_reserve; | |
756 | } | |
757 | ||
758 | /* | |
759 | * 1. Reserve an RPC call slot | |
760 | */ | |
761 | static void | |
762 | call_reserve(struct rpc_task *task) | |
763 | { | |
46121cf7 | 764 | dprint_status(task); |
1da177e4 LT |
765 | |
766 | if (!rpcauth_uptodatecred(task)) { | |
767 | task->tk_action = call_refresh; | |
768 | return; | |
769 | } | |
770 | ||
771 | task->tk_status = 0; | |
772 | task->tk_action = call_reserveresult; | |
773 | xprt_reserve(task); | |
774 | } | |
775 | ||
776 | /* | |
777 | * 1b. Grok the result of xprt_reserve() | |
778 | */ | |
779 | static void | |
780 | call_reserveresult(struct rpc_task *task) | |
781 | { | |
782 | int status = task->tk_status; | |
783 | ||
46121cf7 | 784 | dprint_status(task); |
1da177e4 LT |
785 | |
786 | /* | |
787 | * After a call to xprt_reserve(), we must have either | |
788 | * a request slot or else an error status. | |
789 | */ | |
790 | task->tk_status = 0; | |
791 | if (status >= 0) { | |
792 | if (task->tk_rqstp) { | |
793 | task->tk_action = call_allocate; | |
794 | return; | |
795 | } | |
796 | ||
797 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
798 | __FUNCTION__, status); | |
799 | rpc_exit(task, -EIO); | |
800 | return; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Even though there was an error, we may have acquired | |
805 | * a request slot somehow. Make sure not to leak it. | |
806 | */ | |
807 | if (task->tk_rqstp) { | |
808 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
809 | __FUNCTION__, status); | |
810 | xprt_release(task); | |
811 | } | |
812 | ||
813 | switch (status) { | |
814 | case -EAGAIN: /* woken up; retry */ | |
815 | task->tk_action = call_reserve; | |
816 | return; | |
817 | case -EIO: /* probably a shutdown */ | |
818 | break; | |
819 | default: | |
820 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
821 | __FUNCTION__, status); | |
822 | break; | |
823 | } | |
824 | rpc_exit(task, status); | |
825 | } | |
826 | ||
827 | /* | |
828 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 829 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
830 | */ |
831 | static void | |
832 | call_allocate(struct rpc_task *task) | |
833 | { | |
1be27f36 | 834 | unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; |
02107148 CL |
835 | struct rpc_rqst *req = task->tk_rqstp; |
836 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 837 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 838 | |
46121cf7 CL |
839 | dprint_status(task); |
840 | ||
2bea90d4 | 841 | task->tk_status = 0; |
1da177e4 | 842 | task->tk_action = call_bind; |
2bea90d4 | 843 | |
02107148 | 844 | if (req->rq_buffer) |
1da177e4 LT |
845 | return; |
846 | ||
2bea90d4 CL |
847 | if (proc->p_proc != 0) { |
848 | BUG_ON(proc->p_arglen == 0); | |
849 | if (proc->p_decode != NULL) | |
850 | BUG_ON(proc->p_replen == 0); | |
851 | } | |
1da177e4 | 852 | |
2bea90d4 CL |
853 | /* |
854 | * Calculate the size (in quads) of the RPC call | |
855 | * and reply headers, and convert both values | |
856 | * to byte sizes. | |
857 | */ | |
858 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
859 | req->rq_callsize <<= 2; | |
860 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
861 | req->rq_rcvsize <<= 2; | |
862 | ||
c5a4dd8b CL |
863 | req->rq_buffer = xprt->ops->buf_alloc(task, |
864 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 865 | if (req->rq_buffer != NULL) |
1da177e4 | 866 | return; |
46121cf7 CL |
867 | |
868 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 869 | |
14b218a8 | 870 | if (RPC_IS_ASYNC(task) || !signalled()) { |
b6e9c713 | 871 | task->tk_action = call_allocate; |
1da177e4 LT |
872 | rpc_delay(task, HZ>>4); |
873 | return; | |
874 | } | |
875 | ||
876 | rpc_exit(task, -ERESTARTSYS); | |
877 | } | |
878 | ||
940e3318 TM |
879 | static inline int |
880 | rpc_task_need_encode(struct rpc_task *task) | |
881 | { | |
882 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
883 | } | |
884 | ||
885 | static inline void | |
886 | rpc_task_force_reencode(struct rpc_task *task) | |
887 | { | |
888 | task->tk_rqstp->rq_snd_buf.len = 0; | |
889 | } | |
890 | ||
2bea90d4 CL |
891 | static inline void |
892 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
893 | { | |
894 | buf->head[0].iov_base = start; | |
895 | buf->head[0].iov_len = len; | |
896 | buf->tail[0].iov_len = 0; | |
897 | buf->page_len = 0; | |
4f22ccc3 | 898 | buf->flags = 0; |
2bea90d4 CL |
899 | buf->len = 0; |
900 | buf->buflen = len; | |
901 | } | |
902 | ||
1da177e4 LT |
903 | /* |
904 | * 3. Encode arguments of an RPC call | |
905 | */ | |
906 | static void | |
907 | call_encode(struct rpc_task *task) | |
908 | { | |
1da177e4 | 909 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 910 | kxdrproc_t encode; |
d8ed029d | 911 | __be32 *p; |
1da177e4 | 912 | |
46121cf7 | 913 | dprint_status(task); |
1da177e4 | 914 | |
2bea90d4 CL |
915 | rpc_xdr_buf_init(&req->rq_snd_buf, |
916 | req->rq_buffer, | |
917 | req->rq_callsize); | |
918 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
919 | (char *)req->rq_buffer + req->rq_callsize, | |
920 | req->rq_rcvsize); | |
1da177e4 LT |
921 | |
922 | /* Encode header and provided arguments */ | |
923 | encode = task->tk_msg.rpc_proc->p_encode; | |
924 | if (!(p = call_header(task))) { | |
925 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
926 | rpc_exit(task, -EIO); | |
927 | return; | |
928 | } | |
f3680312 BF |
929 | if (encode == NULL) |
930 | return; | |
931 | ||
932 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
933 | task->tk_msg.rpc_argp); | |
934 | if (task->tk_status == -ENOMEM) { | |
935 | /* XXX: Is this sane? */ | |
936 | rpc_delay(task, 3*HZ); | |
937 | task->tk_status = -EAGAIN; | |
938 | } | |
1da177e4 LT |
939 | } |
940 | ||
941 | /* | |
942 | * 4. Get the server port number if not yet set | |
943 | */ | |
944 | static void | |
945 | call_bind(struct rpc_task *task) | |
946 | { | |
ec739ef0 | 947 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 948 | |
46121cf7 | 949 | dprint_status(task); |
1da177e4 | 950 | |
da351878 | 951 | task->tk_action = call_connect; |
ec739ef0 | 952 | if (!xprt_bound(xprt)) { |
da351878 | 953 | task->tk_action = call_bind_status; |
ec739ef0 | 954 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 955 | xprt->ops->rpcbind(task); |
1da177e4 LT |
956 | } |
957 | } | |
958 | ||
959 | /* | |
da351878 CL |
960 | * 4a. Sort out bind result |
961 | */ | |
962 | static void | |
963 | call_bind_status(struct rpc_task *task) | |
964 | { | |
906462af | 965 | int status = -EIO; |
da351878 CL |
966 | |
967 | if (task->tk_status >= 0) { | |
46121cf7 | 968 | dprint_status(task); |
da351878 CL |
969 | task->tk_status = 0; |
970 | task->tk_action = call_connect; | |
971 | return; | |
972 | } | |
973 | ||
974 | switch (task->tk_status) { | |
2429cbf6 CL |
975 | case -EAGAIN: |
976 | dprintk("RPC: %5u rpcbind waiting for another request " | |
977 | "to finish\n", task->tk_pid); | |
978 | /* avoid busy-waiting here -- could be a network outage. */ | |
979 | rpc_delay(task, 5*HZ); | |
980 | goto retry_timeout; | |
da351878 | 981 | case -EACCES: |
46121cf7 CL |
982 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
983 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
984 | /* fail immediately if this is an RPC ping */ |
985 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
986 | status = -EOPNOTSUPP; | |
987 | break; | |
988 | } | |
ea635a51 | 989 | rpc_delay(task, 3*HZ); |
da45828e | 990 | goto retry_timeout; |
da351878 | 991 | case -ETIMEDOUT: |
46121cf7 | 992 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 993 | task->tk_pid); |
da45828e | 994 | goto retry_timeout; |
da351878 | 995 | case -EPFNOSUPPORT: |
906462af | 996 | /* server doesn't support any rpcbind version we know of */ |
46121cf7 | 997 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
da351878 CL |
998 | task->tk_pid); |
999 | break; | |
1000 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1001 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1002 | task->tk_pid); |
00a6e7bb CL |
1003 | task->tk_status = 0; |
1004 | task->tk_action = call_bind; | |
1005 | return; | |
da351878 | 1006 | default: |
46121cf7 | 1007 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1008 | task->tk_pid, -task->tk_status); |
da351878 CL |
1009 | } |
1010 | ||
1011 | rpc_exit(task, status); | |
1012 | return; | |
1013 | ||
da45828e TM |
1014 | retry_timeout: |
1015 | task->tk_action = call_timeout; | |
da351878 CL |
1016 | } |
1017 | ||
1018 | /* | |
1019 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1020 | */ |
1021 | static void | |
1022 | call_connect(struct rpc_task *task) | |
1023 | { | |
da351878 | 1024 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1025 | |
46121cf7 | 1026 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1027 | task->tk_pid, xprt, |
1028 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1029 | |
da351878 CL |
1030 | task->tk_action = call_transmit; |
1031 | if (!xprt_connected(xprt)) { | |
1032 | task->tk_action = call_connect_status; | |
1033 | if (task->tk_status < 0) | |
1034 | return; | |
1035 | xprt_connect(task); | |
1da177e4 | 1036 | } |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | /* | |
da351878 | 1040 | * 4c. Sort out connect result |
1da177e4 LT |
1041 | */ |
1042 | static void | |
1043 | call_connect_status(struct rpc_task *task) | |
1044 | { | |
1045 | struct rpc_clnt *clnt = task->tk_client; | |
1046 | int status = task->tk_status; | |
1047 | ||
46121cf7 | 1048 | dprint_status(task); |
da351878 | 1049 | |
1da177e4 LT |
1050 | task->tk_status = 0; |
1051 | if (status >= 0) { | |
1052 | clnt->cl_stats->netreconn++; | |
1053 | task->tk_action = call_transmit; | |
1054 | return; | |
1055 | } | |
1056 | ||
da351878 | 1057 | /* Something failed: remote service port may have changed */ |
35f5a422 | 1058 | rpc_force_rebind(clnt); |
da351878 | 1059 | |
1da177e4 LT |
1060 | switch (status) { |
1061 | case -ENOTCONN: | |
1da177e4 | 1062 | case -EAGAIN: |
da351878 | 1063 | task->tk_action = call_bind; |
da45828e TM |
1064 | if (!RPC_IS_SOFT(task)) |
1065 | return; | |
1066 | /* if soft mounted, test if we've timed out */ | |
1067 | case -ETIMEDOUT: | |
1068 | task->tk_action = call_timeout; | |
1069 | return; | |
1da177e4 | 1070 | } |
da45828e | 1071 | rpc_exit(task, -EIO); |
1da177e4 LT |
1072 | } |
1073 | ||
1074 | /* | |
1075 | * 5. Transmit the RPC request, and wait for reply | |
1076 | */ | |
1077 | static void | |
1078 | call_transmit(struct rpc_task *task) | |
1079 | { | |
46121cf7 | 1080 | dprint_status(task); |
1da177e4 LT |
1081 | |
1082 | task->tk_action = call_status; | |
1083 | if (task->tk_status < 0) | |
1084 | return; | |
1085 | task->tk_status = xprt_prepare_transmit(task); | |
1086 | if (task->tk_status != 0) | |
1087 | return; | |
e0ab53de | 1088 | task->tk_action = call_transmit_status; |
1da177e4 | 1089 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1090 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1091 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
1da177e4 | 1092 | call_encode(task); |
5e5ce5be TM |
1093 | /* Did the encode result in an error condition? */ |
1094 | if (task->tk_status != 0) | |
e0ab53de | 1095 | return; |
5e5ce5be | 1096 | } |
1da177e4 LT |
1097 | xprt_transmit(task); |
1098 | if (task->tk_status < 0) | |
1099 | return; | |
e0ab53de TM |
1100 | /* |
1101 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1102 | * in order to allow access to the socket to other RPC requests. | |
1103 | */ | |
1104 | call_transmit_status(task); | |
1105 | if (task->tk_msg.rpc_proc->p_decode != NULL) | |
1106 | return; | |
1107 | task->tk_action = rpc_exit_task; | |
1108 | rpc_wake_up_task(task); | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * 5a. Handle cleanup after a transmission | |
1113 | */ | |
1114 | static void | |
1115 | call_transmit_status(struct rpc_task *task) | |
1116 | { | |
1117 | task->tk_action = call_status; | |
1118 | /* | |
1119 | * Special case: if we've been waiting on the socket's write_space() | |
1120 | * callback, then don't call xprt_end_transmit(). | |
1121 | */ | |
1122 | if (task->tk_status == -EAGAIN) | |
1123 | return; | |
1124 | xprt_end_transmit(task); | |
940e3318 | 1125 | rpc_task_force_reencode(task); |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | /* | |
1129 | * 6. Sort out the RPC call status | |
1130 | */ | |
1131 | static void | |
1132 | call_status(struct rpc_task *task) | |
1133 | { | |
1134 | struct rpc_clnt *clnt = task->tk_client; | |
1135 | struct rpc_rqst *req = task->tk_rqstp; | |
1136 | int status; | |
1137 | ||
1138 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
1139 | task->tk_status = req->rq_received; | |
1140 | ||
46121cf7 | 1141 | dprint_status(task); |
1da177e4 LT |
1142 | |
1143 | status = task->tk_status; | |
1144 | if (status >= 0) { | |
1145 | task->tk_action = call_decode; | |
1146 | return; | |
1147 | } | |
1148 | ||
1149 | task->tk_status = 0; | |
1150 | switch(status) { | |
76303992 TM |
1151 | case -EHOSTDOWN: |
1152 | case -EHOSTUNREACH: | |
1153 | case -ENETUNREACH: | |
1154 | /* | |
1155 | * Delay any retries for 3 seconds, then handle as if it | |
1156 | * were a timeout. | |
1157 | */ | |
1158 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1159 | case -ETIMEDOUT: |
1160 | task->tk_action = call_timeout; | |
241c39b9 | 1161 | if (task->tk_client->cl_discrtry) |
3ebb067d | 1162 | xprt_force_disconnect(task->tk_xprt); |
1da177e4 LT |
1163 | break; |
1164 | case -ECONNREFUSED: | |
1165 | case -ENOTCONN: | |
35f5a422 | 1166 | rpc_force_rebind(clnt); |
1da177e4 LT |
1167 | task->tk_action = call_bind; |
1168 | break; | |
1169 | case -EAGAIN: | |
1170 | task->tk_action = call_transmit; | |
1171 | break; | |
1172 | case -EIO: | |
1173 | /* shutdown or soft timeout */ | |
1174 | rpc_exit(task, status); | |
1175 | break; | |
1176 | default: | |
f518e35a | 1177 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
1178 | clnt->cl_protname, -status); |
1179 | rpc_exit(task, status); | |
1da177e4 LT |
1180 | } |
1181 | } | |
1182 | ||
1183 | /* | |
e0ab53de | 1184 | * 6a. Handle RPC timeout |
1da177e4 LT |
1185 | * We do not release the request slot, so we keep using the |
1186 | * same XID for all retransmits. | |
1187 | */ | |
1188 | static void | |
1189 | call_timeout(struct rpc_task *task) | |
1190 | { | |
1191 | struct rpc_clnt *clnt = task->tk_client; | |
1192 | ||
1193 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1194 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1195 | goto retry; |
1196 | } | |
1197 | ||
46121cf7 | 1198 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1199 | task->tk_timeouts++; |
1200 | ||
1da177e4 | 1201 | if (RPC_IS_SOFT(task)) { |
f518e35a | 1202 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
1203 | clnt->cl_protname, clnt->cl_server); |
1204 | rpc_exit(task, -EIO); | |
1205 | return; | |
1206 | } | |
1207 | ||
f518e35a | 1208 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1209 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1210 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1211 | clnt->cl_protname, clnt->cl_server); | |
1212 | } | |
35f5a422 | 1213 | rpc_force_rebind(clnt); |
1da177e4 LT |
1214 | |
1215 | retry: | |
1216 | clnt->cl_stats->rpcretrans++; | |
1217 | task->tk_action = call_bind; | |
1218 | task->tk_status = 0; | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * 7. Decode the RPC reply | |
1223 | */ | |
1224 | static void | |
1225 | call_decode(struct rpc_task *task) | |
1226 | { | |
1227 | struct rpc_clnt *clnt = task->tk_client; | |
1228 | struct rpc_rqst *req = task->tk_rqstp; | |
1229 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1230 | __be32 *p; |
1da177e4 | 1231 | |
46121cf7 CL |
1232 | dprintk("RPC: %5u call_decode (status %d)\n", |
1233 | task->tk_pid, task->tk_status); | |
1da177e4 | 1234 | |
f518e35a | 1235 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1236 | printk(KERN_NOTICE "%s: server %s OK\n", |
1237 | clnt->cl_protname, clnt->cl_server); | |
1238 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1239 | } | |
1240 | ||
1241 | if (task->tk_status < 12) { | |
1242 | if (!RPC_IS_SOFT(task)) { | |
1243 | task->tk_action = call_bind; | |
1244 | clnt->cl_stats->rpcretrans++; | |
1245 | goto out_retry; | |
1246 | } | |
46121cf7 CL |
1247 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", |
1248 | clnt->cl_protname, task->tk_status); | |
da45828e TM |
1249 | task->tk_action = call_timeout; |
1250 | goto out_retry; | |
1da177e4 LT |
1251 | } |
1252 | ||
43ac3f29 TM |
1253 | /* |
1254 | * Ensure that we see all writes made by xprt_complete_rqst() | |
1255 | * before it changed req->rq_received. | |
1256 | */ | |
1257 | smp_rmb(); | |
1da177e4 LT |
1258 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1259 | ||
1260 | /* Check that the softirq receive buffer is valid */ | |
1261 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1262 | sizeof(req->rq_rcv_buf)) != 0); | |
1263 | ||
1264 | /* Verify the RPC header */ | |
abbcf28f TM |
1265 | p = call_verify(task); |
1266 | if (IS_ERR(p)) { | |
1267 | if (p == ERR_PTR(-EAGAIN)) | |
1268 | goto out_retry; | |
1269 | return; | |
1da177e4 LT |
1270 | } |
1271 | ||
abbcf28f | 1272 | task->tk_action = rpc_exit_task; |
1da177e4 | 1273 | |
6d5fcb5a | 1274 | if (decode) { |
1da177e4 LT |
1275 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1276 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1277 | } |
46121cf7 CL |
1278 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1279 | task->tk_status); | |
1da177e4 LT |
1280 | return; |
1281 | out_retry: | |
1282 | req->rq_received = req->rq_private_buf.len = 0; | |
1283 | task->tk_status = 0; | |
241c39b9 | 1284 | if (task->tk_client->cl_discrtry) |
3ebb067d | 1285 | xprt_force_disconnect(task->tk_xprt); |
1da177e4 LT |
1286 | } |
1287 | ||
1288 | /* | |
1289 | * 8. Refresh the credentials if rejected by the server | |
1290 | */ | |
1291 | static void | |
1292 | call_refresh(struct rpc_task *task) | |
1293 | { | |
46121cf7 | 1294 | dprint_status(task); |
1da177e4 | 1295 | |
1da177e4 LT |
1296 | task->tk_action = call_refreshresult; |
1297 | task->tk_status = 0; | |
1298 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1299 | rpcauth_refreshcred(task); | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * 8a. Process the results of a credential refresh | |
1304 | */ | |
1305 | static void | |
1306 | call_refreshresult(struct rpc_task *task) | |
1307 | { | |
1308 | int status = task->tk_status; | |
46121cf7 CL |
1309 | |
1310 | dprint_status(task); | |
1da177e4 LT |
1311 | |
1312 | task->tk_status = 0; | |
1313 | task->tk_action = call_reserve; | |
1314 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1315 | return; | |
1316 | if (status == -EACCES) { | |
1317 | rpc_exit(task, -EACCES); | |
1318 | return; | |
1319 | } | |
1320 | task->tk_action = call_refresh; | |
1321 | if (status != -ETIMEDOUT) | |
1322 | rpc_delay(task, 3*HZ); | |
1323 | return; | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * Call header serialization | |
1328 | */ | |
d8ed029d | 1329 | static __be32 * |
1da177e4 LT |
1330 | call_header(struct rpc_task *task) |
1331 | { | |
1332 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1333 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1334 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1335 | |
1336 | /* FIXME: check buffer size? */ | |
808012fb CL |
1337 | |
1338 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1339 | *p++ = req->rq_xid; /* XID */ |
1340 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1341 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1342 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1343 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1344 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1345 | p = rpcauth_marshcred(task, p); |
1346 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1347 | return p; | |
1da177e4 LT |
1348 | } |
1349 | ||
1350 | /* | |
1351 | * Reply header verification | |
1352 | */ | |
d8ed029d | 1353 | static __be32 * |
1da177e4 LT |
1354 | call_verify(struct rpc_task *task) |
1355 | { | |
1356 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1357 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1358 | __be32 *p = iov->iov_base; |
1359 | u32 n; | |
1da177e4 LT |
1360 | int error = -EACCES; |
1361 | ||
e8896495 DH |
1362 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1363 | /* RFC-1014 says that the representation of XDR data must be a | |
1364 | * multiple of four bytes | |
1365 | * - if it isn't pointer subtraction in the NFS client may give | |
1366 | * undefined results | |
1367 | */ | |
8a702bbb TM |
1368 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
1369 | " 4 bytes: 0x%x\n", task->tk_pid, __FUNCTION__, | |
1370 | task->tk_rqstp->rq_rcv_buf.len); | |
e8896495 DH |
1371 | goto out_eio; |
1372 | } | |
1da177e4 LT |
1373 | if ((len -= 3) < 0) |
1374 | goto out_overflow; | |
1375 | p += 1; /* skip XID */ | |
1376 | ||
1377 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
8a702bbb TM |
1378 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
1379 | task->tk_pid, __FUNCTION__, n); | |
abbcf28f | 1380 | goto out_garbage; |
1da177e4 LT |
1381 | } |
1382 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1383 | if (--len < 0) | |
1384 | goto out_overflow; | |
1385 | switch ((n = ntohl(*p++))) { | |
1386 | case RPC_AUTH_ERROR: | |
1387 | break; | |
1388 | case RPC_MISMATCH: | |
46121cf7 CL |
1389 | dprintk("RPC: %5u %s: RPC call version " |
1390 | "mismatch!\n", | |
1391 | task->tk_pid, __FUNCTION__); | |
cdf47706 AG |
1392 | error = -EPROTONOSUPPORT; |
1393 | goto out_err; | |
1da177e4 | 1394 | default: |
46121cf7 CL |
1395 | dprintk("RPC: %5u %s: RPC call rejected, " |
1396 | "unknown error: %x\n", | |
1397 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1398 | goto out_eio; |
1399 | } | |
1400 | if (--len < 0) | |
1401 | goto out_overflow; | |
1402 | switch ((n = ntohl(*p++))) { | |
1403 | case RPC_AUTH_REJECTEDCRED: | |
1404 | case RPC_AUTH_REJECTEDVERF: | |
1405 | case RPCSEC_GSS_CREDPROBLEM: | |
1406 | case RPCSEC_GSS_CTXPROBLEM: | |
1407 | if (!task->tk_cred_retry) | |
1408 | break; | |
1409 | task->tk_cred_retry--; | |
46121cf7 CL |
1410 | dprintk("RPC: %5u %s: retry stale creds\n", |
1411 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1412 | rpcauth_invalcred(task); |
220bcc2a TM |
1413 | /* Ensure we obtain a new XID! */ |
1414 | xprt_release(task); | |
1da177e4 | 1415 | task->tk_action = call_refresh; |
abbcf28f | 1416 | goto out_retry; |
1da177e4 LT |
1417 | case RPC_AUTH_BADCRED: |
1418 | case RPC_AUTH_BADVERF: | |
1419 | /* possibly garbled cred/verf? */ | |
1420 | if (!task->tk_garb_retry) | |
1421 | break; | |
1422 | task->tk_garb_retry--; | |
46121cf7 CL |
1423 | dprintk("RPC: %5u %s: retry garbled creds\n", |
1424 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1425 | task->tk_action = call_bind; |
abbcf28f | 1426 | goto out_retry; |
1da177e4 | 1427 | case RPC_AUTH_TOOWEAK: |
1356b8c2 LS |
1428 | printk(KERN_NOTICE "call_verify: server %s requires stronger " |
1429 | "authentication.\n", task->tk_client->cl_server); | |
1da177e4 LT |
1430 | break; |
1431 | default: | |
8a702bbb TM |
1432 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
1433 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1434 | error = -EIO; |
1435 | } | |
46121cf7 CL |
1436 | dprintk("RPC: %5u %s: call rejected %d\n", |
1437 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1438 | goto out_err; |
1439 | } | |
1440 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb TM |
1441 | dprintk("RPC: %5u %s: auth check failed\n", |
1442 | task->tk_pid, __FUNCTION__); | |
abbcf28f | 1443 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1444 | } |
d8ed029d | 1445 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1446 | if (len < 0) |
1447 | goto out_overflow; | |
1448 | switch ((n = ntohl(*p++))) { | |
1449 | case RPC_SUCCESS: | |
1450 | return p; | |
1451 | case RPC_PROG_UNAVAIL: | |
46121cf7 CL |
1452 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
1453 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1454 | (unsigned int)task->tk_client->cl_prog, |
1455 | task->tk_client->cl_server); | |
cdf47706 AG |
1456 | error = -EPFNOSUPPORT; |
1457 | goto out_err; | |
1da177e4 | 1458 | case RPC_PROG_MISMATCH: |
46121cf7 CL |
1459 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
1460 | "server %s\n", task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1461 | (unsigned int)task->tk_client->cl_prog, |
1462 | (unsigned int)task->tk_client->cl_vers, | |
1463 | task->tk_client->cl_server); | |
cdf47706 AG |
1464 | error = -EPROTONOSUPPORT; |
1465 | goto out_err; | |
1da177e4 | 1466 | case RPC_PROC_UNAVAIL: |
46121cf7 CL |
1467 | dprintk("RPC: %5u %s: proc %p unsupported by program %u, " |
1468 | "version %u on server %s\n", | |
1469 | task->tk_pid, __FUNCTION__, | |
1da177e4 LT |
1470 | task->tk_msg.rpc_proc, |
1471 | task->tk_client->cl_prog, | |
1472 | task->tk_client->cl_vers, | |
1473 | task->tk_client->cl_server); | |
cdf47706 AG |
1474 | error = -EOPNOTSUPP; |
1475 | goto out_err; | |
1da177e4 | 1476 | case RPC_GARBAGE_ARGS: |
46121cf7 CL |
1477 | dprintk("RPC: %5u %s: server saw garbage\n", |
1478 | task->tk_pid, __FUNCTION__); | |
1da177e4 LT |
1479 | break; /* retry */ |
1480 | default: | |
8a702bbb TM |
1481 | dprintk("RPC: %5u %s: server accept status: %x\n", |
1482 | task->tk_pid, __FUNCTION__, n); | |
1da177e4 LT |
1483 | /* Also retry */ |
1484 | } | |
1485 | ||
abbcf28f | 1486 | out_garbage: |
1da177e4 LT |
1487 | task->tk_client->cl_stats->rpcgarbage++; |
1488 | if (task->tk_garb_retry) { | |
1489 | task->tk_garb_retry--; | |
46121cf7 CL |
1490 | dprintk("RPC: %5u %s: retrying\n", |
1491 | task->tk_pid, __FUNCTION__); | |
1da177e4 | 1492 | task->tk_action = call_bind; |
abbcf28f TM |
1493 | out_retry: |
1494 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 1495 | } |
1da177e4 LT |
1496 | out_eio: |
1497 | error = -EIO; | |
1498 | out_err: | |
1499 | rpc_exit(task, error); | |
8a702bbb TM |
1500 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
1501 | __FUNCTION__, error); | |
abbcf28f | 1502 | return ERR_PTR(error); |
1da177e4 | 1503 | out_overflow: |
8a702bbb TM |
1504 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
1505 | __FUNCTION__); | |
abbcf28f | 1506 | goto out_garbage; |
1da177e4 | 1507 | } |
5ee0ed7d | 1508 | |
d8ed029d | 1509 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1510 | { |
1511 | return 0; | |
1512 | } | |
1513 | ||
d8ed029d | 1514 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1515 | { |
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static struct rpc_procinfo rpcproc_null = { | |
1520 | .p_encode = rpcproc_encode_null, | |
1521 | .p_decode = rpcproc_decode_null, | |
1522 | }; | |
1523 | ||
64c91a1f | 1524 | static int rpc_ping(struct rpc_clnt *clnt, int flags) |
5ee0ed7d TM |
1525 | { |
1526 | struct rpc_message msg = { | |
1527 | .rpc_proc = &rpcproc_null, | |
1528 | }; | |
1529 | int err; | |
1530 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1531 | err = rpc_call_sync(clnt, &msg, flags); | |
1532 | put_rpccred(msg.rpc_cred); | |
1533 | return err; | |
1534 | } | |
188fef11 | 1535 | |
5e1550d6 TM |
1536 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1537 | { | |
1538 | struct rpc_message msg = { | |
1539 | .rpc_proc = &rpcproc_null, | |
1540 | .rpc_cred = cred, | |
1541 | }; | |
84115e1c TM |
1542 | struct rpc_task_setup task_setup_data = { |
1543 | .rpc_client = clnt, | |
1544 | .rpc_message = &msg, | |
1545 | .callback_ops = &rpc_default_ops, | |
1546 | .flags = flags, | |
1547 | }; | |
c970aa85 | 1548 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 1549 | } |
e8914c65 | 1550 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 1551 | |
188fef11 TM |
1552 | #ifdef RPC_DEBUG |
1553 | void rpc_show_tasks(void) | |
1554 | { | |
1555 | struct rpc_clnt *clnt; | |
1556 | struct rpc_task *t; | |
1557 | ||
1558 | spin_lock(&rpc_client_lock); | |
1559 | if (list_empty(&all_clients)) | |
1560 | goto out; | |
1561 | printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout " | |
1562 | "-rpcwait -action- ---ops--\n"); | |
1563 | list_for_each_entry(clnt, &all_clients, cl_clients) { | |
1564 | if (list_empty(&clnt->cl_tasks)) | |
1565 | continue; | |
1566 | spin_lock(&clnt->cl_lock); | |
1567 | list_for_each_entry(t, &clnt->cl_tasks, tk_task) { | |
1568 | const char *rpc_waitq = "none"; | |
d66968f2 CL |
1569 | int proc; |
1570 | ||
1571 | if (t->tk_msg.rpc_proc) | |
1572 | proc = t->tk_msg.rpc_proc->p_proc; | |
1573 | else | |
1574 | proc = -1; | |
188fef11 TM |
1575 | |
1576 | if (RPC_IS_QUEUED(t)) | |
1577 | rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq); | |
1578 | ||
1579 | printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n", | |
d66968f2 | 1580 | t->tk_pid, proc, |
188fef11 TM |
1581 | t->tk_flags, t->tk_status, |
1582 | t->tk_client, | |
1583 | (t->tk_client ? t->tk_client->cl_prog : 0), | |
1584 | t->tk_rqstp, t->tk_timeout, | |
1585 | rpc_waitq, | |
1586 | t->tk_action, t->tk_ops); | |
1587 | } | |
1588 | spin_unlock(&clnt->cl_lock); | |
1589 | } | |
1590 | out: | |
1591 | spin_unlock(&rpc_client_lock); | |
1592 | } | |
1593 | #endif |