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> | |
cb3997b5 | 28 | #include <linux/kallsyms.h> |
1da177e4 LT |
29 | #include <linux/mm.h> |
30 | #include <linux/slab.h> | |
6d5fcb5a | 31 | #include <linux/smp_lock.h> |
1da177e4 | 32 | #include <linux/utsname.h> |
11c556b3 | 33 | #include <linux/workqueue.h> |
510deb0d | 34 | #include <linux/in6.h> |
1da177e4 LT |
35 | |
36 | #include <linux/sunrpc/clnt.h> | |
1da177e4 | 37 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 38 | #include <linux/sunrpc/metrics.h> |
1da177e4 LT |
39 | |
40 | ||
1da177e4 LT |
41 | #ifdef RPC_DEBUG |
42 | # define RPCDBG_FACILITY RPCDBG_CALL | |
43 | #endif | |
44 | ||
46121cf7 CL |
45 | #define dprint_status(t) \ |
46 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 47 | __func__, t->tk_status) |
46121cf7 | 48 | |
188fef11 TM |
49 | /* |
50 | * All RPC clients are linked into this list | |
51 | */ | |
52 | static LIST_HEAD(all_clients); | |
53 | static DEFINE_SPINLOCK(rpc_client_lock); | |
54 | ||
1da177e4 LT |
55 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
56 | ||
57 | ||
58 | static void call_start(struct rpc_task *task); | |
59 | static void call_reserve(struct rpc_task *task); | |
60 | static void call_reserveresult(struct rpc_task *task); | |
61 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
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); | |
1da177e4 | 73 | |
b0e1c57e CL |
74 | static __be32 *rpc_encode_header(struct rpc_task *task); |
75 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
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; | |
d5b337b4 | 177 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 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 | ||
ba7392bb TM |
191 | clnt->cl_timeout = xprt->timeout; |
192 | if (args->timeout != NULL) { | |
193 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
194 | sizeof(clnt->cl_timeout_default)); | |
195 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
196 | } | |
197 | ||
1da177e4 | 198 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 199 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
608207e8 OK |
200 | clnt->cl_principal = NULL; |
201 | if (args->client_name) { | |
202 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); | |
203 | if (!clnt->cl_principal) | |
204 | goto out_no_principal; | |
205 | } | |
1da177e4 | 206 | |
34f52e35 TM |
207 | kref_init(&clnt->cl_kref); |
208 | ||
1da177e4 LT |
209 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
210 | if (err < 0) | |
211 | goto out_no_path; | |
212 | ||
698b6d08 | 213 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 214 | if (IS_ERR(auth)) { |
1da177e4 | 215 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 216 | args->authflavor); |
6a19275a | 217 | err = PTR_ERR(auth); |
1da177e4 LT |
218 | goto out_no_auth; |
219 | } | |
220 | ||
221 | /* save the nodename */ | |
63ffc23d | 222 | clnt->cl_nodelen = strlen(init_utsname()->nodename); |
1da177e4 LT |
223 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
224 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
63ffc23d | 225 | memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen); |
6529eba0 | 226 | rpc_register_client(clnt); |
1da177e4 LT |
227 | return clnt; |
228 | ||
229 | out_no_auth: | |
54281548 | 230 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 231 | rpc_rmdir(clnt->cl_dentry); |
54281548 TM |
232 | rpc_put_mount(); |
233 | } | |
1da177e4 | 234 | out_no_path: |
608207e8 OK |
235 | kfree(clnt->cl_principal); |
236 | out_no_principal: | |
23bf85ba TM |
237 | rpc_free_iostats(clnt->cl_metrics); |
238 | out_no_stats: | |
1da177e4 LT |
239 | if (clnt->cl_server != clnt->cl_inline_name) |
240 | kfree(clnt->cl_server); | |
241 | kfree(clnt); | |
242 | out_err: | |
6b6ca86b | 243 | xprt_put(xprt); |
712917d1 | 244 | out_no_xprt: |
4ada539e TM |
245 | rpciod_down(); |
246 | out_no_rpciod: | |
1da177e4 LT |
247 | return ERR_PTR(err); |
248 | } | |
249 | ||
c2866763 CL |
250 | /* |
251 | * rpc_create - create an RPC client and transport with one call | |
252 | * @args: rpc_clnt create argument structure | |
253 | * | |
254 | * Creates and initializes an RPC transport and an RPC client. | |
255 | * | |
256 | * It can ping the server in order to determine if it is up, and to see if | |
257 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
258 | * this behavior so asynchronous tasks can also use rpc_create. | |
259 | */ | |
260 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
261 | { | |
262 | struct rpc_xprt *xprt; | |
263 | struct rpc_clnt *clnt; | |
3c341b0b | 264 | struct xprt_create xprtargs = { |
4fa016eb | 265 | .ident = args->protocol, |
d3bc9a1d | 266 | .srcaddr = args->saddress, |
96802a09 FM |
267 | .dstaddr = args->address, |
268 | .addrlen = args->addrsize, | |
96802a09 | 269 | }; |
510deb0d | 270 | char servername[48]; |
c2866763 | 271 | |
43780b87 CL |
272 | /* |
273 | * If the caller chooses not to specify a hostname, whip | |
274 | * up a string representation of the passed-in address. | |
275 | */ | |
276 | if (args->servername == NULL) { | |
510deb0d CL |
277 | servername[0] = '\0'; |
278 | switch (args->address->sa_family) { | |
279 | case AF_INET: { | |
280 | struct sockaddr_in *sin = | |
281 | (struct sockaddr_in *)args->address; | |
21454aaa HH |
282 | snprintf(servername, sizeof(servername), "%pI4", |
283 | &sin->sin_addr.s_addr); | |
510deb0d CL |
284 | break; |
285 | } | |
286 | case AF_INET6: { | |
287 | struct sockaddr_in6 *sin = | |
288 | (struct sockaddr_in6 *)args->address; | |
5b095d98 | 289 | snprintf(servername, sizeof(servername), "%pI6", |
fdb46ee7 | 290 | &sin->sin6_addr); |
510deb0d CL |
291 | break; |
292 | } | |
293 | default: | |
294 | /* caller wants default server name, but | |
295 | * address family isn't recognized. */ | |
296 | return ERR_PTR(-EINVAL); | |
297 | } | |
43780b87 CL |
298 | args->servername = servername; |
299 | } | |
300 | ||
510deb0d CL |
301 | xprt = xprt_create_transport(&xprtargs); |
302 | if (IS_ERR(xprt)) | |
303 | return (struct rpc_clnt *)xprt; | |
304 | ||
c2866763 CL |
305 | /* |
306 | * By default, kernel RPC client connects from a reserved port. | |
307 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
308 | * but it is always enabled for rpciod, which handles the connect | |
309 | * operation. | |
310 | */ | |
311 | xprt->resvport = 1; | |
312 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
313 | xprt->resvport = 0; | |
314 | ||
698b6d08 | 315 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
316 | if (IS_ERR(clnt)) |
317 | return clnt; | |
318 | ||
319 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
150030b7 | 320 | int err = rpc_ping(clnt, RPC_TASK_SOFT); |
c2866763 CL |
321 | if (err != 0) { |
322 | rpc_shutdown_client(clnt); | |
323 | return ERR_PTR(err); | |
324 | } | |
325 | } | |
326 | ||
327 | clnt->cl_softrtry = 1; | |
328 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
329 | clnt->cl_softrtry = 0; | |
330 | ||
c2866763 CL |
331 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
332 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
333 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
334 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
335 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
336 | clnt->cl_chatty = 1; | |
c2866763 CL |
337 | |
338 | return clnt; | |
339 | } | |
b86acd50 | 340 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 341 | |
1da177e4 LT |
342 | /* |
343 | * This function clones the RPC client structure. It allows us to share the | |
344 | * same transport while varying parameters such as the authentication | |
345 | * flavour. | |
346 | */ | |
347 | struct rpc_clnt * | |
348 | rpc_clone_client(struct rpc_clnt *clnt) | |
349 | { | |
350 | struct rpc_clnt *new; | |
3e32a5d9 | 351 | int err = -ENOMEM; |
1da177e4 | 352 | |
e69062b4 | 353 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
354 | if (!new) |
355 | goto out_no_clnt; | |
d431a555 TM |
356 | new->cl_parent = clnt; |
357 | /* Turn off autobind on clones */ | |
358 | new->cl_autobind = 0; | |
359 | INIT_LIST_HEAD(&new->cl_tasks); | |
360 | spin_lock_init(&new->cl_lock); | |
ba7392bb | 361 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
23bf85ba TM |
362 | new->cl_metrics = rpc_alloc_iostats(clnt); |
363 | if (new->cl_metrics == NULL) | |
364 | goto out_no_stats; | |
608207e8 OK |
365 | if (clnt->cl_principal) { |
366 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); | |
367 | if (new->cl_principal == NULL) | |
368 | goto out_no_principal; | |
369 | } | |
34f52e35 | 370 | kref_init(&new->cl_kref); |
3e32a5d9 TM |
371 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
372 | if (err != 0) | |
373 | goto out_no_path; | |
1da177e4 LT |
374 | if (new->cl_auth) |
375 | atomic_inc(&new->cl_auth->au_count); | |
d431a555 TM |
376 | xprt_get(clnt->cl_xprt); |
377 | kref_get(&clnt->cl_kref); | |
6529eba0 | 378 | rpc_register_client(new); |
4ada539e | 379 | rpciod_up(); |
1da177e4 | 380 | return new; |
3e32a5d9 | 381 | out_no_path: |
608207e8 OK |
382 | kfree(new->cl_principal); |
383 | out_no_principal: | |
3e32a5d9 | 384 | rpc_free_iostats(new->cl_metrics); |
23bf85ba TM |
385 | out_no_stats: |
386 | kfree(new); | |
1da177e4 | 387 | out_no_clnt: |
0dc47877 | 388 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 389 | return ERR_PTR(err); |
1da177e4 | 390 | } |
e8914c65 | 391 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 LT |
392 | |
393 | /* | |
394 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 395 | * requests. |
1da177e4 | 396 | */ |
4c402b40 | 397 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 398 | { |
34f52e35 TM |
399 | dprintk("RPC: shutting down %s client for %s\n", |
400 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 | 401 | |
34f52e35 | 402 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 403 | rpc_killall_tasks(clnt); |
532347e2 | 404 | wait_event_timeout(destroy_wait, |
34f52e35 | 405 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
406 | } |
407 | ||
4c402b40 | 408 | rpc_release_client(clnt); |
1da177e4 | 409 | } |
e8914c65 | 410 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
411 | |
412 | /* | |
34f52e35 | 413 | * Free an RPC client |
1da177e4 | 414 | */ |
34f52e35 TM |
415 | static void |
416 | rpc_free_client(struct kref *kref) | |
1da177e4 | 417 | { |
34f52e35 | 418 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
1da177e4 | 419 | |
46121cf7 | 420 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 | 421 | clnt->cl_protname, clnt->cl_server); |
8f8e7a50 | 422 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 423 | rpc_rmdir(clnt->cl_dentry); |
8f8e7a50 TM |
424 | rpc_put_mount(); |
425 | } | |
3e32a5d9 | 426 | if (clnt->cl_parent != clnt) { |
8ad7c892 | 427 | rpc_release_client(clnt->cl_parent); |
3e32a5d9 TM |
428 | goto out_free; |
429 | } | |
1da177e4 LT |
430 | if (clnt->cl_server != clnt->cl_inline_name) |
431 | kfree(clnt->cl_server); | |
432 | out_free: | |
6529eba0 | 433 | rpc_unregister_client(clnt); |
11c556b3 | 434 | rpc_free_iostats(clnt->cl_metrics); |
608207e8 | 435 | kfree(clnt->cl_principal); |
11c556b3 | 436 | clnt->cl_metrics = NULL; |
6b6ca86b | 437 | xprt_put(clnt->cl_xprt); |
4ada539e | 438 | rpciod_down(); |
1da177e4 | 439 | kfree(clnt); |
1da177e4 LT |
440 | } |
441 | ||
1dd17ec6 TM |
442 | /* |
443 | * Free an RPC client | |
444 | */ | |
445 | static void | |
446 | rpc_free_auth(struct kref *kref) | |
447 | { | |
448 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); | |
449 | ||
450 | if (clnt->cl_auth == NULL) { | |
451 | rpc_free_client(kref); | |
452 | return; | |
453 | } | |
454 | ||
455 | /* | |
456 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
457 | * release remaining GSS contexts. This mechanism ensures | |
458 | * that it can do so safely. | |
459 | */ | |
460 | kref_init(kref); | |
461 | rpcauth_release(clnt->cl_auth); | |
462 | clnt->cl_auth = NULL; | |
463 | kref_put(kref, rpc_free_client); | |
464 | } | |
465 | ||
1da177e4 | 466 | /* |
34f52e35 | 467 | * Release reference to the RPC client |
1da177e4 LT |
468 | */ |
469 | void | |
470 | rpc_release_client(struct rpc_clnt *clnt) | |
471 | { | |
34f52e35 | 472 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 473 | |
34f52e35 TM |
474 | if (list_empty(&clnt->cl_tasks)) |
475 | wake_up(&destroy_wait); | |
1dd17ec6 | 476 | kref_put(&clnt->cl_kref, rpc_free_auth); |
34f52e35 TM |
477 | } |
478 | ||
007e251f AG |
479 | /** |
480 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
481 | * @old: old rpc_client |
482 | * @program: rpc program to set | |
483 | * @vers: rpc program version | |
007e251f AG |
484 | * |
485 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
486 | * of use for enabling different RPC programs to share the same transport. | |
487 | * The Sun NFSv2/v3 ACL protocol can do this. | |
488 | */ | |
489 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
490 | struct rpc_program *program, | |
89eb21c3 | 491 | u32 vers) |
007e251f AG |
492 | { |
493 | struct rpc_clnt *clnt; | |
494 | struct rpc_version *version; | |
495 | int err; | |
496 | ||
497 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
498 | version = program->version[vers]; | |
499 | clnt = rpc_clone_client(old); | |
500 | if (IS_ERR(clnt)) | |
501 | goto out; | |
502 | clnt->cl_procinfo = version->procs; | |
503 | clnt->cl_maxproc = version->nrprocs; | |
504 | clnt->cl_protname = program->name; | |
505 | clnt->cl_prog = program->number; | |
506 | clnt->cl_vers = version->number; | |
507 | clnt->cl_stats = program->stats; | |
150030b7 | 508 | err = rpc_ping(clnt, RPC_TASK_SOFT); |
007e251f AG |
509 | if (err != 0) { |
510 | rpc_shutdown_client(clnt); | |
511 | clnt = ERR_PTR(err); | |
512 | } | |
cca5172a | 513 | out: |
007e251f AG |
514 | return clnt; |
515 | } | |
e8914c65 | 516 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 517 | |
1da177e4 LT |
518 | /* |
519 | * Default callback for async RPC calls | |
520 | */ | |
521 | static void | |
963d8fe5 | 522 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
523 | { |
524 | } | |
525 | ||
963d8fe5 TM |
526 | static const struct rpc_call_ops rpc_default_ops = { |
527 | .rpc_call_done = rpc_default_callback, | |
528 | }; | |
529 | ||
c970aa85 TM |
530 | /** |
531 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
532 | * @task_setup_data: pointer to task initialisation data | |
533 | */ | |
534 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 TM |
535 | { |
536 | struct rpc_task *task, *ret; | |
6e5b70e9 | 537 | |
84115e1c | 538 | task = rpc_new_task(task_setup_data); |
6e5b70e9 | 539 | if (task == NULL) { |
84115e1c TM |
540 | rpc_release_calldata(task_setup_data->callback_ops, |
541 | task_setup_data->callback_data); | |
50859259 TM |
542 | ret = ERR_PTR(-ENOMEM); |
543 | goto out; | |
6e5b70e9 TM |
544 | } |
545 | ||
b3ef8b3b TM |
546 | if (task->tk_status != 0) { |
547 | ret = ERR_PTR(task->tk_status); | |
548 | rpc_put_task(task); | |
549 | goto out; | |
6e5b70e9 TM |
550 | } |
551 | atomic_inc(&task->tk_count); | |
552 | rpc_execute(task); | |
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 | 564 | */ |
cbc20059 | 565 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
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 | |
65b6e42c | 592 | * @tk_ops: RPC call ops |
6e5b70e9 | 593 | * @data: user call data |
1da177e4 LT |
594 | */ |
595 | int | |
cbc20059 | 596 | rpc_call_async(struct rpc_clnt *clnt, const 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 | |
77de2c59 TM |
616 | void |
617 | rpc_call_start(struct rpc_task *task) | |
618 | { | |
619 | task->tk_action = call_start; | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
622 | ||
ed39440a CL |
623 | /** |
624 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
625 | * @clnt: RPC client structure | |
626 | * @buf: target buffer | |
65b6e42c | 627 | * @bufsize: length of target buffer |
ed39440a CL |
628 | * |
629 | * Returns the number of bytes that are actually in the stored address. | |
630 | */ | |
631 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
632 | { | |
633 | size_t bytes; | |
634 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
635 | ||
636 | bytes = sizeof(xprt->addr); | |
637 | if (bytes > bufsize) | |
638 | bytes = bufsize; | |
639 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 640 | return xprt->addrlen; |
ed39440a | 641 | } |
b86acd50 | 642 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 643 | |
f425eba4 CL |
644 | /** |
645 | * rpc_peeraddr2str - return remote peer address in printable format | |
646 | * @clnt: RPC client structure | |
647 | * @format: address format | |
648 | * | |
649 | */ | |
b454ae90 CL |
650 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
651 | enum rpc_display_format_t format) | |
f425eba4 CL |
652 | { |
653 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
654 | |
655 | if (xprt->address_strings[format] != NULL) | |
656 | return xprt->address_strings[format]; | |
657 | else | |
658 | return "unprintable"; | |
f425eba4 | 659 | } |
b86acd50 | 660 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 661 | |
1da177e4 LT |
662 | void |
663 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
664 | { | |
665 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
666 | if (xprt->ops->set_buffer_size) |
667 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 | 668 | } |
e8914c65 | 669 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 LT |
670 | |
671 | /* | |
672 | * Return size of largest payload RPC client can support, in bytes | |
673 | * | |
674 | * For stream transports, this is one RPC record fragment (see RFC | |
675 | * 1831), as we don't support multi-record requests yet. For datagram | |
676 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
677 | * RPC header sizes. | |
678 | */ | |
679 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
680 | { | |
681 | return clnt->cl_xprt->max_payload; | |
682 | } | |
b86acd50 | 683 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 684 | |
35f5a422 CL |
685 | /** |
686 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
687 | * @clnt: client to rebind | |
688 | * | |
689 | */ | |
690 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
691 | { | |
692 | if (clnt->cl_autobind) | |
ec739ef0 | 693 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 694 | } |
b86acd50 | 695 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 696 | |
aae2006e AA |
697 | /* |
698 | * Restart an (async) RPC call from the call_prepare state. | |
699 | * Usually called from within the exit handler. | |
700 | */ | |
701 | void | |
702 | rpc_restart_call_prepare(struct rpc_task *task) | |
703 | { | |
704 | if (RPC_ASSASSINATED(task)) | |
705 | return; | |
706 | task->tk_action = rpc_prepare_task; | |
707 | } | |
708 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
709 | ||
1da177e4 LT |
710 | /* |
711 | * Restart an (async) RPC call. Usually called from within the | |
712 | * exit handler. | |
713 | */ | |
714 | void | |
715 | rpc_restart_call(struct rpc_task *task) | |
716 | { | |
717 | if (RPC_ASSASSINATED(task)) | |
718 | return; | |
719 | ||
720 | task->tk_action = call_start; | |
721 | } | |
e8914c65 | 722 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 723 | |
3748f1e4 CL |
724 | #ifdef RPC_DEBUG |
725 | static const char *rpc_proc_name(const struct rpc_task *task) | |
726 | { | |
727 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
728 | ||
729 | if (proc) { | |
730 | if (proc->p_name) | |
731 | return proc->p_name; | |
732 | else | |
733 | return "NULL"; | |
734 | } else | |
735 | return "no proc"; | |
736 | } | |
737 | #endif | |
738 | ||
1da177e4 LT |
739 | /* |
740 | * 0. Initial state | |
741 | * | |
742 | * Other FSM states can be visited zero or more times, but | |
743 | * this state is visited exactly once for each RPC. | |
744 | */ | |
745 | static void | |
746 | call_start(struct rpc_task *task) | |
747 | { | |
748 | struct rpc_clnt *clnt = task->tk_client; | |
749 | ||
3748f1e4 | 750 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
46121cf7 | 751 | clnt->cl_protname, clnt->cl_vers, |
3748f1e4 | 752 | rpc_proc_name(task), |
46121cf7 | 753 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
754 | |
755 | /* Increment call count */ | |
756 | task->tk_msg.rpc_proc->p_count++; | |
757 | clnt->cl_stats->rpccnt++; | |
758 | task->tk_action = call_reserve; | |
759 | } | |
760 | ||
761 | /* | |
762 | * 1. Reserve an RPC call slot | |
763 | */ | |
764 | static void | |
765 | call_reserve(struct rpc_task *task) | |
766 | { | |
46121cf7 | 767 | dprint_status(task); |
1da177e4 LT |
768 | |
769 | if (!rpcauth_uptodatecred(task)) { | |
770 | task->tk_action = call_refresh; | |
771 | return; | |
772 | } | |
773 | ||
774 | task->tk_status = 0; | |
775 | task->tk_action = call_reserveresult; | |
776 | xprt_reserve(task); | |
777 | } | |
778 | ||
779 | /* | |
780 | * 1b. Grok the result of xprt_reserve() | |
781 | */ | |
782 | static void | |
783 | call_reserveresult(struct rpc_task *task) | |
784 | { | |
785 | int status = task->tk_status; | |
786 | ||
46121cf7 | 787 | dprint_status(task); |
1da177e4 LT |
788 | |
789 | /* | |
790 | * After a call to xprt_reserve(), we must have either | |
791 | * a request slot or else an error status. | |
792 | */ | |
793 | task->tk_status = 0; | |
794 | if (status >= 0) { | |
795 | if (task->tk_rqstp) { | |
796 | task->tk_action = call_allocate; | |
797 | return; | |
798 | } | |
799 | ||
800 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 801 | __func__, status); |
1da177e4 LT |
802 | rpc_exit(task, -EIO); |
803 | return; | |
804 | } | |
805 | ||
806 | /* | |
807 | * Even though there was an error, we may have acquired | |
808 | * a request slot somehow. Make sure not to leak it. | |
809 | */ | |
810 | if (task->tk_rqstp) { | |
811 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 812 | __func__, status); |
1da177e4 LT |
813 | xprt_release(task); |
814 | } | |
815 | ||
816 | switch (status) { | |
817 | case -EAGAIN: /* woken up; retry */ | |
818 | task->tk_action = call_reserve; | |
819 | return; | |
820 | case -EIO: /* probably a shutdown */ | |
821 | break; | |
822 | default: | |
823 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 824 | __func__, status); |
1da177e4 LT |
825 | break; |
826 | } | |
827 | rpc_exit(task, status); | |
828 | } | |
829 | ||
830 | /* | |
831 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 832 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
833 | */ |
834 | static void | |
835 | call_allocate(struct rpc_task *task) | |
836 | { | |
1be27f36 | 837 | unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; |
02107148 CL |
838 | struct rpc_rqst *req = task->tk_rqstp; |
839 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 840 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 841 | |
46121cf7 CL |
842 | dprint_status(task); |
843 | ||
2bea90d4 | 844 | task->tk_status = 0; |
1da177e4 | 845 | task->tk_action = call_bind; |
2bea90d4 | 846 | |
02107148 | 847 | if (req->rq_buffer) |
1da177e4 LT |
848 | return; |
849 | ||
2bea90d4 CL |
850 | if (proc->p_proc != 0) { |
851 | BUG_ON(proc->p_arglen == 0); | |
852 | if (proc->p_decode != NULL) | |
853 | BUG_ON(proc->p_replen == 0); | |
854 | } | |
1da177e4 | 855 | |
2bea90d4 CL |
856 | /* |
857 | * Calculate the size (in quads) of the RPC call | |
858 | * and reply headers, and convert both values | |
859 | * to byte sizes. | |
860 | */ | |
861 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
862 | req->rq_callsize <<= 2; | |
863 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
864 | req->rq_rcvsize <<= 2; | |
865 | ||
c5a4dd8b CL |
866 | req->rq_buffer = xprt->ops->buf_alloc(task, |
867 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 868 | if (req->rq_buffer != NULL) |
1da177e4 | 869 | return; |
46121cf7 CL |
870 | |
871 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 872 | |
14b218a8 | 873 | if (RPC_IS_ASYNC(task) || !signalled()) { |
b6e9c713 | 874 | task->tk_action = call_allocate; |
1da177e4 LT |
875 | rpc_delay(task, HZ>>4); |
876 | return; | |
877 | } | |
878 | ||
879 | rpc_exit(task, -ERESTARTSYS); | |
880 | } | |
881 | ||
940e3318 TM |
882 | static inline int |
883 | rpc_task_need_encode(struct rpc_task *task) | |
884 | { | |
885 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
886 | } | |
887 | ||
888 | static inline void | |
889 | rpc_task_force_reencode(struct rpc_task *task) | |
890 | { | |
891 | task->tk_rqstp->rq_snd_buf.len = 0; | |
892 | } | |
893 | ||
2bea90d4 CL |
894 | static inline void |
895 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
896 | { | |
897 | buf->head[0].iov_base = start; | |
898 | buf->head[0].iov_len = len; | |
899 | buf->tail[0].iov_len = 0; | |
900 | buf->page_len = 0; | |
4f22ccc3 | 901 | buf->flags = 0; |
2bea90d4 CL |
902 | buf->len = 0; |
903 | buf->buflen = len; | |
904 | } | |
905 | ||
1da177e4 LT |
906 | /* |
907 | * 3. Encode arguments of an RPC call | |
908 | */ | |
909 | static void | |
b0e1c57e | 910 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 911 | { |
1da177e4 | 912 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 913 | kxdrproc_t encode; |
d8ed029d | 914 | __be32 *p; |
1da177e4 | 915 | |
46121cf7 | 916 | dprint_status(task); |
1da177e4 | 917 | |
2bea90d4 CL |
918 | rpc_xdr_buf_init(&req->rq_snd_buf, |
919 | req->rq_buffer, | |
920 | req->rq_callsize); | |
921 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
922 | (char *)req->rq_buffer + req->rq_callsize, | |
923 | req->rq_rcvsize); | |
1da177e4 | 924 | |
b0e1c57e CL |
925 | p = rpc_encode_header(task); |
926 | if (p == NULL) { | |
927 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
928 | rpc_exit(task, -EIO); |
929 | return; | |
930 | } | |
b0e1c57e CL |
931 | |
932 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
933 | if (encode == NULL) |
934 | return; | |
935 | ||
936 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
937 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
938 | } |
939 | ||
940 | /* | |
941 | * 4. Get the server port number if not yet set | |
942 | */ | |
943 | static void | |
944 | call_bind(struct rpc_task *task) | |
945 | { | |
ec739ef0 | 946 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 947 | |
46121cf7 | 948 | dprint_status(task); |
1da177e4 | 949 | |
da351878 | 950 | task->tk_action = call_connect; |
ec739ef0 | 951 | if (!xprt_bound(xprt)) { |
da351878 | 952 | task->tk_action = call_bind_status; |
ec739ef0 | 953 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 954 | xprt->ops->rpcbind(task); |
1da177e4 LT |
955 | } |
956 | } | |
957 | ||
958 | /* | |
da351878 CL |
959 | * 4a. Sort out bind result |
960 | */ | |
961 | static void | |
962 | call_bind_status(struct rpc_task *task) | |
963 | { | |
906462af | 964 | int status = -EIO; |
da351878 CL |
965 | |
966 | if (task->tk_status >= 0) { | |
46121cf7 | 967 | dprint_status(task); |
da351878 CL |
968 | task->tk_status = 0; |
969 | task->tk_action = call_connect; | |
970 | return; | |
971 | } | |
972 | ||
973 | switch (task->tk_status) { | |
381ba74a TM |
974 | case -ENOMEM: |
975 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
976 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 977 | goto retry_timeout; |
da351878 | 978 | case -EACCES: |
46121cf7 CL |
979 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
980 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
981 | /* fail immediately if this is an RPC ping */ |
982 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
983 | status = -EOPNOTSUPP; | |
984 | break; | |
985 | } | |
ea635a51 | 986 | rpc_delay(task, 3*HZ); |
da45828e | 987 | goto retry_timeout; |
da351878 | 988 | case -ETIMEDOUT: |
46121cf7 | 989 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 990 | task->tk_pid); |
da45828e | 991 | goto retry_timeout; |
da351878 | 992 | case -EPFNOSUPPORT: |
906462af | 993 | /* server doesn't support any rpcbind version we know of */ |
46121cf7 | 994 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
da351878 CL |
995 | task->tk_pid); |
996 | break; | |
997 | case -EPROTONOSUPPORT: | |
00a6e7bb | 998 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 999 | task->tk_pid); |
00a6e7bb CL |
1000 | task->tk_status = 0; |
1001 | task->tk_action = call_bind; | |
1002 | return; | |
da351878 | 1003 | default: |
46121cf7 | 1004 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1005 | task->tk_pid, -task->tk_status); |
da351878 CL |
1006 | } |
1007 | ||
1008 | rpc_exit(task, status); | |
1009 | return; | |
1010 | ||
da45828e TM |
1011 | retry_timeout: |
1012 | task->tk_action = call_timeout; | |
da351878 CL |
1013 | } |
1014 | ||
1015 | /* | |
1016 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1017 | */ |
1018 | static void | |
1019 | call_connect(struct rpc_task *task) | |
1020 | { | |
da351878 | 1021 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1022 | |
46121cf7 | 1023 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1024 | task->tk_pid, xprt, |
1025 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1026 | |
da351878 CL |
1027 | task->tk_action = call_transmit; |
1028 | if (!xprt_connected(xprt)) { | |
1029 | task->tk_action = call_connect_status; | |
1030 | if (task->tk_status < 0) | |
1031 | return; | |
1032 | xprt_connect(task); | |
1da177e4 | 1033 | } |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | /* | |
da351878 | 1037 | * 4c. Sort out connect result |
1da177e4 LT |
1038 | */ |
1039 | static void | |
1040 | call_connect_status(struct rpc_task *task) | |
1041 | { | |
1042 | struct rpc_clnt *clnt = task->tk_client; | |
1043 | int status = task->tk_status; | |
1044 | ||
46121cf7 | 1045 | dprint_status(task); |
da351878 | 1046 | |
1da177e4 | 1047 | task->tk_status = 0; |
2a491991 | 1048 | if (status >= 0 || status == -EAGAIN) { |
1da177e4 LT |
1049 | clnt->cl_stats->netreconn++; |
1050 | task->tk_action = call_transmit; | |
1051 | return; | |
1052 | } | |
1053 | ||
1da177e4 | 1054 | switch (status) { |
da45828e TM |
1055 | /* if soft mounted, test if we've timed out */ |
1056 | case -ETIMEDOUT: | |
1057 | task->tk_action = call_timeout; | |
2a491991 TM |
1058 | break; |
1059 | default: | |
1060 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1061 | } |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * 5. Transmit the RPC request, and wait for reply | |
1066 | */ | |
1067 | static void | |
1068 | call_transmit(struct rpc_task *task) | |
1069 | { | |
46121cf7 | 1070 | dprint_status(task); |
1da177e4 LT |
1071 | |
1072 | task->tk_action = call_status; | |
1073 | if (task->tk_status < 0) | |
1074 | return; | |
1075 | task->tk_status = xprt_prepare_transmit(task); | |
1076 | if (task->tk_status != 0) | |
1077 | return; | |
e0ab53de | 1078 | task->tk_action = call_transmit_status; |
1da177e4 | 1079 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1080 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1081 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
b0e1c57e | 1082 | rpc_xdr_encode(task); |
5e5ce5be | 1083 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1084 | if (task->tk_status != 0) { |
1085 | /* Was the error nonfatal? */ | |
1086 | if (task->tk_status == -EAGAIN) | |
1087 | rpc_delay(task, HZ >> 4); | |
1088 | else | |
1089 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1090 | return; |
8b39f2b4 | 1091 | } |
5e5ce5be | 1092 | } |
1da177e4 LT |
1093 | xprt_transmit(task); |
1094 | if (task->tk_status < 0) | |
1095 | return; | |
e0ab53de TM |
1096 | /* |
1097 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1098 | * in order to allow access to the socket to other RPC requests. | |
1099 | */ | |
1100 | call_transmit_status(task); | |
1101 | if (task->tk_msg.rpc_proc->p_decode != NULL) | |
1102 | return; | |
1103 | task->tk_action = rpc_exit_task; | |
fda13939 | 1104 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
e0ab53de TM |
1105 | } |
1106 | ||
1107 | /* | |
1108 | * 5a. Handle cleanup after a transmission | |
1109 | */ | |
1110 | static void | |
1111 | call_transmit_status(struct rpc_task *task) | |
1112 | { | |
1113 | task->tk_action = call_status; | |
15f081ca TM |
1114 | switch (task->tk_status) { |
1115 | case -EAGAIN: | |
1116 | break; | |
1117 | default: | |
1118 | xprt_end_transmit(task); | |
1119 | /* | |
1120 | * Special cases: if we've been waiting on the | |
1121 | * socket's write_space() callback, or if the | |
1122 | * socket just returned a connection error, | |
1123 | * then hold onto the transport lock. | |
1124 | */ | |
1125 | case -ECONNREFUSED: | |
c8485e4d | 1126 | case -ECONNRESET: |
15f081ca TM |
1127 | case -ENOTCONN: |
1128 | case -EHOSTDOWN: | |
1129 | case -EHOSTUNREACH: | |
1130 | case -ENETUNREACH: | |
c8485e4d | 1131 | case -EPIPE: |
15f081ca TM |
1132 | rpc_task_force_reencode(task); |
1133 | } | |
1da177e4 LT |
1134 | } |
1135 | ||
1136 | /* | |
1137 | * 6. Sort out the RPC call status | |
1138 | */ | |
1139 | static void | |
1140 | call_status(struct rpc_task *task) | |
1141 | { | |
1142 | struct rpc_clnt *clnt = task->tk_client; | |
1143 | struct rpc_rqst *req = task->tk_rqstp; | |
1144 | int status; | |
1145 | ||
1146 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
1147 | task->tk_status = req->rq_received; | |
1148 | ||
46121cf7 | 1149 | dprint_status(task); |
1da177e4 LT |
1150 | |
1151 | status = task->tk_status; | |
1152 | if (status >= 0) { | |
1153 | task->tk_action = call_decode; | |
1154 | return; | |
1155 | } | |
1156 | ||
1157 | task->tk_status = 0; | |
1158 | switch(status) { | |
76303992 TM |
1159 | case -EHOSTDOWN: |
1160 | case -EHOSTUNREACH: | |
1161 | case -ENETUNREACH: | |
1162 | /* | |
1163 | * Delay any retries for 3 seconds, then handle as if it | |
1164 | * were a timeout. | |
1165 | */ | |
1166 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1167 | case -ETIMEDOUT: |
1168 | task->tk_action = call_timeout; | |
241c39b9 | 1169 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1170 | xprt_conditional_disconnect(task->tk_xprt, |
1171 | req->rq_connect_cookie); | |
1da177e4 | 1172 | break; |
c8485e4d | 1173 | case -ECONNRESET: |
1da177e4 | 1174 | case -ECONNREFUSED: |
35f5a422 | 1175 | rpc_force_rebind(clnt); |
c8485e4d TM |
1176 | rpc_delay(task, 3*HZ); |
1177 | case -EPIPE: | |
1178 | case -ENOTCONN: | |
1da177e4 LT |
1179 | task->tk_action = call_bind; |
1180 | break; | |
1181 | case -EAGAIN: | |
1182 | task->tk_action = call_transmit; | |
1183 | break; | |
1184 | case -EIO: | |
1185 | /* shutdown or soft timeout */ | |
1186 | rpc_exit(task, status); | |
1187 | break; | |
1188 | default: | |
b6b6152c OK |
1189 | if (clnt->cl_chatty) |
1190 | printk("%s: RPC call returned error %d\n", | |
1da177e4 LT |
1191 | clnt->cl_protname, -status); |
1192 | rpc_exit(task, status); | |
1da177e4 LT |
1193 | } |
1194 | } | |
1195 | ||
1196 | /* | |
e0ab53de | 1197 | * 6a. Handle RPC timeout |
1da177e4 LT |
1198 | * We do not release the request slot, so we keep using the |
1199 | * same XID for all retransmits. | |
1200 | */ | |
1201 | static void | |
1202 | call_timeout(struct rpc_task *task) | |
1203 | { | |
1204 | struct rpc_clnt *clnt = task->tk_client; | |
1205 | ||
1206 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1207 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1208 | goto retry; |
1209 | } | |
1210 | ||
46121cf7 | 1211 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1212 | task->tk_timeouts++; |
1213 | ||
1da177e4 | 1214 | if (RPC_IS_SOFT(task)) { |
b6b6152c OK |
1215 | if (clnt->cl_chatty) |
1216 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", | |
1da177e4 LT |
1217 | clnt->cl_protname, clnt->cl_server); |
1218 | rpc_exit(task, -EIO); | |
1219 | return; | |
1220 | } | |
1221 | ||
f518e35a | 1222 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1223 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
b6b6152c OK |
1224 | if (clnt->cl_chatty) |
1225 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1da177e4 LT |
1226 | clnt->cl_protname, clnt->cl_server); |
1227 | } | |
35f5a422 | 1228 | rpc_force_rebind(clnt); |
b48633bd TM |
1229 | /* |
1230 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1231 | * event? RFC2203 requires the server to drop all such requests. | |
1232 | */ | |
1233 | rpcauth_invalcred(task); | |
1da177e4 LT |
1234 | |
1235 | retry: | |
1236 | clnt->cl_stats->rpcretrans++; | |
1237 | task->tk_action = call_bind; | |
1238 | task->tk_status = 0; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * 7. Decode the RPC reply | |
1243 | */ | |
1244 | static void | |
1245 | call_decode(struct rpc_task *task) | |
1246 | { | |
1247 | struct rpc_clnt *clnt = task->tk_client; | |
1248 | struct rpc_rqst *req = task->tk_rqstp; | |
1249 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1250 | __be32 *p; |
1da177e4 | 1251 | |
46121cf7 CL |
1252 | dprintk("RPC: %5u call_decode (status %d)\n", |
1253 | task->tk_pid, task->tk_status); | |
1da177e4 | 1254 | |
f518e35a | 1255 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
b6b6152c OK |
1256 | if (clnt->cl_chatty) |
1257 | printk(KERN_NOTICE "%s: server %s OK\n", | |
1258 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 LT |
1259 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1260 | } | |
1261 | ||
43ac3f29 TM |
1262 | /* |
1263 | * Ensure that we see all writes made by xprt_complete_rqst() | |
1264 | * before it changed req->rq_received. | |
1265 | */ | |
1266 | smp_rmb(); | |
1da177e4 LT |
1267 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1268 | ||
1269 | /* Check that the softirq receive buffer is valid */ | |
1270 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1271 | sizeof(req->rq_rcv_buf)) != 0); | |
1272 | ||
1e799b67 TM |
1273 | if (req->rq_rcv_buf.len < 12) { |
1274 | if (!RPC_IS_SOFT(task)) { | |
1275 | task->tk_action = call_bind; | |
1276 | clnt->cl_stats->rpcretrans++; | |
1277 | goto out_retry; | |
1278 | } | |
1279 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
1280 | clnt->cl_protname, task->tk_status); | |
1281 | task->tk_action = call_timeout; | |
1282 | goto out_retry; | |
1283 | } | |
1284 | ||
b0e1c57e | 1285 | p = rpc_verify_header(task); |
abbcf28f TM |
1286 | if (IS_ERR(p)) { |
1287 | if (p == ERR_PTR(-EAGAIN)) | |
1288 | goto out_retry; | |
1289 | return; | |
1da177e4 LT |
1290 | } |
1291 | ||
abbcf28f | 1292 | task->tk_action = rpc_exit_task; |
1da177e4 | 1293 | |
6d5fcb5a | 1294 | if (decode) { |
1da177e4 LT |
1295 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1296 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1297 | } |
46121cf7 CL |
1298 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1299 | task->tk_status); | |
1da177e4 LT |
1300 | return; |
1301 | out_retry: | |
1da177e4 | 1302 | task->tk_status = 0; |
b0e1c57e | 1303 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 1304 | if (task->tk_rqstp == req) { |
1e799b67 | 1305 | req->rq_received = req->rq_rcv_buf.len = 0; |
24b74bf0 | 1306 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1307 | xprt_conditional_disconnect(task->tk_xprt, |
1308 | req->rq_connect_cookie); | |
24b74bf0 | 1309 | } |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | /* | |
1313 | * 8. Refresh the credentials if rejected by the server | |
1314 | */ | |
1315 | static void | |
1316 | call_refresh(struct rpc_task *task) | |
1317 | { | |
46121cf7 | 1318 | dprint_status(task); |
1da177e4 | 1319 | |
1da177e4 LT |
1320 | task->tk_action = call_refreshresult; |
1321 | task->tk_status = 0; | |
1322 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1323 | rpcauth_refreshcred(task); | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * 8a. Process the results of a credential refresh | |
1328 | */ | |
1329 | static void | |
1330 | call_refreshresult(struct rpc_task *task) | |
1331 | { | |
1332 | int status = task->tk_status; | |
46121cf7 CL |
1333 | |
1334 | dprint_status(task); | |
1da177e4 LT |
1335 | |
1336 | task->tk_status = 0; | |
1337 | task->tk_action = call_reserve; | |
1338 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1339 | return; | |
1340 | if (status == -EACCES) { | |
1341 | rpc_exit(task, -EACCES); | |
1342 | return; | |
1343 | } | |
1344 | task->tk_action = call_refresh; | |
1345 | if (status != -ETIMEDOUT) | |
1346 | rpc_delay(task, 3*HZ); | |
1347 | return; | |
1348 | } | |
1349 | ||
d8ed029d | 1350 | static __be32 * |
b0e1c57e | 1351 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
1352 | { |
1353 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1354 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1355 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1356 | |
1357 | /* FIXME: check buffer size? */ | |
808012fb CL |
1358 | |
1359 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1360 | *p++ = req->rq_xid; /* XID */ |
1361 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1362 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1363 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1364 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1365 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1366 | p = rpcauth_marshcred(task, p); |
1367 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1368 | return p; | |
1da177e4 LT |
1369 | } |
1370 | ||
d8ed029d | 1371 | static __be32 * |
b0e1c57e | 1372 | rpc_verify_header(struct rpc_task *task) |
1da177e4 LT |
1373 | { |
1374 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1375 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1376 | __be32 *p = iov->iov_base; |
1377 | u32 n; | |
1da177e4 LT |
1378 | int error = -EACCES; |
1379 | ||
e8896495 DH |
1380 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1381 | /* RFC-1014 says that the representation of XDR data must be a | |
1382 | * multiple of four bytes | |
1383 | * - if it isn't pointer subtraction in the NFS client may give | |
1384 | * undefined results | |
1385 | */ | |
8a702bbb | 1386 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 1387 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 1388 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
1389 | goto out_eio; |
1390 | } | |
1da177e4 LT |
1391 | if ((len -= 3) < 0) |
1392 | goto out_overflow; | |
1393 | p += 1; /* skip XID */ | |
1394 | ||
1395 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
8a702bbb | 1396 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
0dc47877 | 1397 | task->tk_pid, __func__, n); |
abbcf28f | 1398 | goto out_garbage; |
1da177e4 LT |
1399 | } |
1400 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1401 | if (--len < 0) | |
1402 | goto out_overflow; | |
1403 | switch ((n = ntohl(*p++))) { | |
1404 | case RPC_AUTH_ERROR: | |
1405 | break; | |
1406 | case RPC_MISMATCH: | |
46121cf7 CL |
1407 | dprintk("RPC: %5u %s: RPC call version " |
1408 | "mismatch!\n", | |
0dc47877 | 1409 | task->tk_pid, __func__); |
cdf47706 AG |
1410 | error = -EPROTONOSUPPORT; |
1411 | goto out_err; | |
1da177e4 | 1412 | default: |
46121cf7 CL |
1413 | dprintk("RPC: %5u %s: RPC call rejected, " |
1414 | "unknown error: %x\n", | |
0dc47877 | 1415 | task->tk_pid, __func__, n); |
1da177e4 LT |
1416 | goto out_eio; |
1417 | } | |
1418 | if (--len < 0) | |
1419 | goto out_overflow; | |
1420 | switch ((n = ntohl(*p++))) { | |
1421 | case RPC_AUTH_REJECTEDCRED: | |
1422 | case RPC_AUTH_REJECTEDVERF: | |
1423 | case RPCSEC_GSS_CREDPROBLEM: | |
1424 | case RPCSEC_GSS_CTXPROBLEM: | |
1425 | if (!task->tk_cred_retry) | |
1426 | break; | |
1427 | task->tk_cred_retry--; | |
46121cf7 | 1428 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 1429 | task->tk_pid, __func__); |
1da177e4 | 1430 | rpcauth_invalcred(task); |
220bcc2a TM |
1431 | /* Ensure we obtain a new XID! */ |
1432 | xprt_release(task); | |
1da177e4 | 1433 | task->tk_action = call_refresh; |
abbcf28f | 1434 | goto out_retry; |
1da177e4 LT |
1435 | case RPC_AUTH_BADCRED: |
1436 | case RPC_AUTH_BADVERF: | |
1437 | /* possibly garbled cred/verf? */ | |
1438 | if (!task->tk_garb_retry) | |
1439 | break; | |
1440 | task->tk_garb_retry--; | |
46121cf7 | 1441 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 1442 | task->tk_pid, __func__); |
1da177e4 | 1443 | task->tk_action = call_bind; |
abbcf28f | 1444 | goto out_retry; |
1da177e4 | 1445 | case RPC_AUTH_TOOWEAK: |
b0e1c57e | 1446 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
1356b8c2 | 1447 | "authentication.\n", task->tk_client->cl_server); |
1da177e4 LT |
1448 | break; |
1449 | default: | |
8a702bbb | 1450 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 1451 | task->tk_pid, __func__, n); |
1da177e4 LT |
1452 | error = -EIO; |
1453 | } | |
46121cf7 | 1454 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 1455 | task->tk_pid, __func__, n); |
1da177e4 LT |
1456 | goto out_err; |
1457 | } | |
1458 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 1459 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 1460 | task->tk_pid, __func__); |
abbcf28f | 1461 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1462 | } |
d8ed029d | 1463 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1464 | if (len < 0) |
1465 | goto out_overflow; | |
1466 | switch ((n = ntohl(*p++))) { | |
1467 | case RPC_SUCCESS: | |
1468 | return p; | |
1469 | case RPC_PROG_UNAVAIL: | |
46121cf7 | 1470 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
0dc47877 | 1471 | task->tk_pid, __func__, |
1da177e4 LT |
1472 | (unsigned int)task->tk_client->cl_prog, |
1473 | task->tk_client->cl_server); | |
cdf47706 AG |
1474 | error = -EPFNOSUPPORT; |
1475 | goto out_err; | |
1da177e4 | 1476 | case RPC_PROG_MISMATCH: |
46121cf7 | 1477 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
0dc47877 | 1478 | "server %s\n", task->tk_pid, __func__, |
1da177e4 LT |
1479 | (unsigned int)task->tk_client->cl_prog, |
1480 | (unsigned int)task->tk_client->cl_vers, | |
1481 | task->tk_client->cl_server); | |
cdf47706 AG |
1482 | error = -EPROTONOSUPPORT; |
1483 | goto out_err; | |
1da177e4 | 1484 | case RPC_PROC_UNAVAIL: |
3748f1e4 | 1485 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 1486 | "version %u on server %s\n", |
0dc47877 | 1487 | task->tk_pid, __func__, |
3748f1e4 | 1488 | rpc_proc_name(task), |
1da177e4 LT |
1489 | task->tk_client->cl_prog, |
1490 | task->tk_client->cl_vers, | |
1491 | task->tk_client->cl_server); | |
cdf47706 AG |
1492 | error = -EOPNOTSUPP; |
1493 | goto out_err; | |
1da177e4 | 1494 | case RPC_GARBAGE_ARGS: |
46121cf7 | 1495 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 1496 | task->tk_pid, __func__); |
1da177e4 LT |
1497 | break; /* retry */ |
1498 | default: | |
8a702bbb | 1499 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 1500 | task->tk_pid, __func__, n); |
1da177e4 LT |
1501 | /* Also retry */ |
1502 | } | |
1503 | ||
abbcf28f | 1504 | out_garbage: |
1da177e4 LT |
1505 | task->tk_client->cl_stats->rpcgarbage++; |
1506 | if (task->tk_garb_retry) { | |
1507 | task->tk_garb_retry--; | |
46121cf7 | 1508 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 1509 | task->tk_pid, __func__); |
1da177e4 | 1510 | task->tk_action = call_bind; |
abbcf28f TM |
1511 | out_retry: |
1512 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 1513 | } |
1da177e4 LT |
1514 | out_eio: |
1515 | error = -EIO; | |
1516 | out_err: | |
1517 | rpc_exit(task, error); | |
8a702bbb | 1518 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 1519 | __func__, error); |
abbcf28f | 1520 | return ERR_PTR(error); |
1da177e4 | 1521 | out_overflow: |
8a702bbb | 1522 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 1523 | __func__); |
abbcf28f | 1524 | goto out_garbage; |
1da177e4 | 1525 | } |
5ee0ed7d | 1526 | |
d8ed029d | 1527 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1528 | { |
1529 | return 0; | |
1530 | } | |
1531 | ||
d8ed029d | 1532 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1533 | { |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | static struct rpc_procinfo rpcproc_null = { | |
1538 | .p_encode = rpcproc_encode_null, | |
1539 | .p_decode = rpcproc_decode_null, | |
1540 | }; | |
1541 | ||
64c91a1f | 1542 | static int rpc_ping(struct rpc_clnt *clnt, int flags) |
5ee0ed7d TM |
1543 | { |
1544 | struct rpc_message msg = { | |
1545 | .rpc_proc = &rpcproc_null, | |
1546 | }; | |
1547 | int err; | |
1548 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1549 | err = rpc_call_sync(clnt, &msg, flags); | |
1550 | put_rpccred(msg.rpc_cred); | |
1551 | return err; | |
1552 | } | |
188fef11 | 1553 | |
5e1550d6 TM |
1554 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1555 | { | |
1556 | struct rpc_message msg = { | |
1557 | .rpc_proc = &rpcproc_null, | |
1558 | .rpc_cred = cred, | |
1559 | }; | |
84115e1c TM |
1560 | struct rpc_task_setup task_setup_data = { |
1561 | .rpc_client = clnt, | |
1562 | .rpc_message = &msg, | |
1563 | .callback_ops = &rpc_default_ops, | |
1564 | .flags = flags, | |
1565 | }; | |
c970aa85 | 1566 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 1567 | } |
e8914c65 | 1568 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 1569 | |
188fef11 | 1570 | #ifdef RPC_DEBUG |
68a23ee9 CL |
1571 | static void rpc_show_header(void) |
1572 | { | |
cb3997b5 CL |
1573 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
1574 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
1575 | } |
1576 | ||
38e886e0 CL |
1577 | static void rpc_show_task(const struct rpc_clnt *clnt, |
1578 | const struct rpc_task *task) | |
1579 | { | |
1580 | const char *rpc_waitq = "none"; | |
cb3997b5 | 1581 | char *p, action[KSYM_SYMBOL_LEN]; |
38e886e0 CL |
1582 | |
1583 | if (RPC_IS_QUEUED(task)) | |
1584 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
1585 | ||
cb3997b5 CL |
1586 | /* map tk_action pointer to a function name; then trim off |
1587 | * the "+0x0 [sunrpc]" */ | |
1588 | sprint_symbol(action, (unsigned long)task->tk_action); | |
1589 | p = strchr(action, '+'); | |
1590 | if (p) | |
1591 | *p = '\0'; | |
1592 | ||
1593 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n", | |
1594 | task->tk_pid, task->tk_flags, task->tk_status, | |
1595 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
1596 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), | |
1597 | action, rpc_waitq); | |
38e886e0 CL |
1598 | } |
1599 | ||
188fef11 TM |
1600 | void rpc_show_tasks(void) |
1601 | { | |
1602 | struct rpc_clnt *clnt; | |
38e886e0 | 1603 | struct rpc_task *task; |
68a23ee9 | 1604 | int header = 0; |
188fef11 TM |
1605 | |
1606 | spin_lock(&rpc_client_lock); | |
188fef11 | 1607 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
188fef11 | 1608 | spin_lock(&clnt->cl_lock); |
38e886e0 | 1609 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
1610 | if (!header) { |
1611 | rpc_show_header(); | |
1612 | header++; | |
1613 | } | |
38e886e0 | 1614 | rpc_show_task(clnt, task); |
188fef11 TM |
1615 | } |
1616 | spin_unlock(&clnt->cl_lock); | |
1617 | } | |
188fef11 TM |
1618 | spin_unlock(&rpc_client_lock); |
1619 | } | |
1620 | #endif |