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> | |
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> |
55ae1aab | 38 | #include <linux/sunrpc/bc_xprt.h> |
1da177e4 | 39 | |
55ae1aab | 40 | #include "sunrpc.h" |
1da177e4 | 41 | |
1da177e4 LT |
42 | #ifdef RPC_DEBUG |
43 | # define RPCDBG_FACILITY RPCDBG_CALL | |
44 | #endif | |
45 | ||
46121cf7 CL |
46 | #define dprint_status(t) \ |
47 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 48 | __func__, t->tk_status) |
46121cf7 | 49 | |
188fef11 TM |
50 | /* |
51 | * All RPC clients are linked into this list | |
52 | */ | |
53 | static LIST_HEAD(all_clients); | |
54 | static DEFINE_SPINLOCK(rpc_client_lock); | |
55 | ||
1da177e4 LT |
56 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
57 | ||
58 | ||
59 | static void call_start(struct rpc_task *task); | |
60 | static void call_reserve(struct rpc_task *task); | |
61 | static void call_reserveresult(struct rpc_task *task); | |
62 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
63 | static void call_decode(struct rpc_task *task); |
64 | static void call_bind(struct rpc_task *task); | |
da351878 | 65 | static void call_bind_status(struct rpc_task *task); |
1da177e4 | 66 | static void call_transmit(struct rpc_task *task); |
55ae1aab RL |
67 | #if defined(CONFIG_NFS_V4_1) |
68 | static void call_bc_transmit(struct rpc_task *task); | |
69 | #endif /* CONFIG_NFS_V4_1 */ | |
1da177e4 | 70 | static void call_status(struct rpc_task *task); |
940e3318 | 71 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
72 | static void call_refresh(struct rpc_task *task); |
73 | static void call_refreshresult(struct rpc_task *task); | |
74 | static void call_timeout(struct rpc_task *task); | |
75 | static void call_connect(struct rpc_task *task); | |
76 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 77 | |
b0e1c57e CL |
78 | static __be32 *rpc_encode_header(struct rpc_task *task); |
79 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
64c91a1f TM |
80 | static int rpc_ping(struct rpc_clnt *clnt, int flags); |
81 | ||
188fef11 TM |
82 | static void rpc_register_client(struct rpc_clnt *clnt) |
83 | { | |
84 | spin_lock(&rpc_client_lock); | |
85 | list_add(&clnt->cl_clients, &all_clients); | |
86 | spin_unlock(&rpc_client_lock); | |
87 | } | |
88 | ||
89 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
90 | { | |
91 | spin_lock(&rpc_client_lock); | |
92 | list_del(&clnt->cl_clients); | |
93 | spin_unlock(&rpc_client_lock); | |
94 | } | |
1da177e4 LT |
95 | |
96 | static int | |
97 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
98 | { | |
f134585a | 99 | static uint32_t clntid; |
1da177e4 LT |
100 | int error; |
101 | ||
54281548 TM |
102 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
103 | clnt->cl_dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
104 | if (dir_name == NULL) |
105 | return 0; | |
54281548 TM |
106 | |
107 | clnt->cl_vfsmnt = rpc_get_mount(); | |
108 | if (IS_ERR(clnt->cl_vfsmnt)) | |
109 | return PTR_ERR(clnt->cl_vfsmnt); | |
110 | ||
f134585a TM |
111 | for (;;) { |
112 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
113 | "%s/clnt%x", dir_name, | |
114 | (unsigned int)clntid++); | |
115 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
116 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
117 | if (!IS_ERR(clnt->cl_dentry)) | |
118 | return 0; | |
1da177e4 | 119 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
120 | if (error != -EEXIST) { |
121 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
122 | clnt->cl_pathname, error); | |
54281548 | 123 | rpc_put_mount(); |
f134585a TM |
124 | return error; |
125 | } | |
1da177e4 LT |
126 | } |
127 | } | |
128 | ||
698b6d08 | 129 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 130 | { |
698b6d08 | 131 | struct rpc_program *program = args->program; |
1da177e4 LT |
132 | struct rpc_version *version; |
133 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 134 | struct rpc_auth *auth; |
1da177e4 | 135 | int err; |
06b8d255 CL |
136 | size_t len; |
137 | ||
138 | /* sanity check the name before trying to print it */ | |
139 | err = -EINVAL; | |
698b6d08 | 140 | len = strlen(args->servername); |
06b8d255 CL |
141 | if (len > RPC_MAXNETNAMELEN) |
142 | goto out_no_rpciod; | |
143 | len++; | |
1da177e4 | 144 | |
46121cf7 | 145 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 146 | program->name, args->servername, xprt); |
1da177e4 | 147 | |
4ada539e TM |
148 | err = rpciod_up(); |
149 | if (err) | |
150 | goto out_no_rpciod; | |
1da177e4 LT |
151 | err = -EINVAL; |
152 | if (!xprt) | |
712917d1 | 153 | goto out_no_xprt; |
698b6d08 TM |
154 | |
155 | if (args->version >= program->nrvers) | |
156 | goto out_err; | |
157 | version = program->version[args->version]; | |
158 | if (version == NULL) | |
1da177e4 LT |
159 | goto out_err; |
160 | ||
161 | err = -ENOMEM; | |
0da974f4 | 162 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
163 | if (!clnt) |
164 | goto out_err; | |
1da177e4 LT |
165 | clnt->cl_parent = clnt; |
166 | ||
167 | clnt->cl_server = clnt->cl_inline_name; | |
1da177e4 LT |
168 | if (len > sizeof(clnt->cl_inline_name)) { |
169 | char *buf = kmalloc(len, GFP_KERNEL); | |
698b6d08 | 170 | if (buf != NULL) |
1da177e4 LT |
171 | clnt->cl_server = buf; |
172 | else | |
173 | len = sizeof(clnt->cl_inline_name); | |
174 | } | |
698b6d08 | 175 | strlcpy(clnt->cl_server, args->servername, len); |
1da177e4 LT |
176 | |
177 | clnt->cl_xprt = xprt; | |
178 | clnt->cl_procinfo = version->procs; | |
179 | clnt->cl_maxproc = version->nrprocs; | |
180 | clnt->cl_protname = program->name; | |
d5b337b4 | 181 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 182 | clnt->cl_vers = version->number; |
1da177e4 | 183 | clnt->cl_stats = program->stats; |
11c556b3 | 184 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
185 | err = -ENOMEM; |
186 | if (clnt->cl_metrics == NULL) | |
187 | goto out_no_stats; | |
3e32a5d9 | 188 | clnt->cl_program = program; |
6529eba0 | 189 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 190 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 191 | |
ec739ef0 | 192 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
193 | clnt->cl_autobind = 1; |
194 | ||
ba7392bb TM |
195 | clnt->cl_timeout = xprt->timeout; |
196 | if (args->timeout != NULL) { | |
197 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
198 | sizeof(clnt->cl_timeout_default)); | |
199 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
200 | } | |
201 | ||
1da177e4 | 202 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 203 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
608207e8 OK |
204 | clnt->cl_principal = NULL; |
205 | if (args->client_name) { | |
206 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); | |
207 | if (!clnt->cl_principal) | |
208 | goto out_no_principal; | |
209 | } | |
1da177e4 | 210 | |
34f52e35 TM |
211 | kref_init(&clnt->cl_kref); |
212 | ||
1da177e4 LT |
213 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
214 | if (err < 0) | |
215 | goto out_no_path; | |
216 | ||
698b6d08 | 217 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 218 | if (IS_ERR(auth)) { |
1da177e4 | 219 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 220 | args->authflavor); |
6a19275a | 221 | err = PTR_ERR(auth); |
1da177e4 LT |
222 | goto out_no_auth; |
223 | } | |
224 | ||
225 | /* save the nodename */ | |
63ffc23d | 226 | clnt->cl_nodelen = strlen(init_utsname()->nodename); |
1da177e4 LT |
227 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
228 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
63ffc23d | 229 | memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen); |
6529eba0 | 230 | rpc_register_client(clnt); |
1da177e4 LT |
231 | return clnt; |
232 | ||
233 | out_no_auth: | |
54281548 | 234 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 235 | rpc_rmdir(clnt->cl_dentry); |
54281548 TM |
236 | rpc_put_mount(); |
237 | } | |
1da177e4 | 238 | out_no_path: |
608207e8 OK |
239 | kfree(clnt->cl_principal); |
240 | out_no_principal: | |
23bf85ba TM |
241 | rpc_free_iostats(clnt->cl_metrics); |
242 | out_no_stats: | |
1da177e4 LT |
243 | if (clnt->cl_server != clnt->cl_inline_name) |
244 | kfree(clnt->cl_server); | |
245 | kfree(clnt); | |
246 | out_err: | |
6b6ca86b | 247 | xprt_put(xprt); |
712917d1 | 248 | out_no_xprt: |
4ada539e TM |
249 | rpciod_down(); |
250 | out_no_rpciod: | |
1da177e4 LT |
251 | return ERR_PTR(err); |
252 | } | |
253 | ||
c2866763 CL |
254 | /* |
255 | * rpc_create - create an RPC client and transport with one call | |
256 | * @args: rpc_clnt create argument structure | |
257 | * | |
258 | * Creates and initializes an RPC transport and an RPC client. | |
259 | * | |
260 | * It can ping the server in order to determine if it is up, and to see if | |
261 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
262 | * this behavior so asynchronous tasks can also use rpc_create. | |
263 | */ | |
264 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
265 | { | |
266 | struct rpc_xprt *xprt; | |
267 | struct rpc_clnt *clnt; | |
3c341b0b | 268 | struct xprt_create xprtargs = { |
4fa016eb | 269 | .ident = args->protocol, |
d3bc9a1d | 270 | .srcaddr = args->saddress, |
96802a09 FM |
271 | .dstaddr = args->address, |
272 | .addrlen = args->addrsize, | |
96802a09 | 273 | }; |
510deb0d | 274 | char servername[48]; |
c2866763 | 275 | |
43780b87 CL |
276 | /* |
277 | * If the caller chooses not to specify a hostname, whip | |
278 | * up a string representation of the passed-in address. | |
279 | */ | |
280 | if (args->servername == NULL) { | |
510deb0d CL |
281 | servername[0] = '\0'; |
282 | switch (args->address->sa_family) { | |
283 | case AF_INET: { | |
284 | struct sockaddr_in *sin = | |
285 | (struct sockaddr_in *)args->address; | |
21454aaa HH |
286 | snprintf(servername, sizeof(servername), "%pI4", |
287 | &sin->sin_addr.s_addr); | |
510deb0d CL |
288 | break; |
289 | } | |
290 | case AF_INET6: { | |
291 | struct sockaddr_in6 *sin = | |
292 | (struct sockaddr_in6 *)args->address; | |
5b095d98 | 293 | snprintf(servername, sizeof(servername), "%pI6", |
fdb46ee7 | 294 | &sin->sin6_addr); |
510deb0d CL |
295 | break; |
296 | } | |
297 | default: | |
298 | /* caller wants default server name, but | |
299 | * address family isn't recognized. */ | |
300 | return ERR_PTR(-EINVAL); | |
301 | } | |
43780b87 CL |
302 | args->servername = servername; |
303 | } | |
304 | ||
510deb0d CL |
305 | xprt = xprt_create_transport(&xprtargs); |
306 | if (IS_ERR(xprt)) | |
307 | return (struct rpc_clnt *)xprt; | |
308 | ||
c2866763 CL |
309 | /* |
310 | * By default, kernel RPC client connects from a reserved port. | |
311 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
312 | * but it is always enabled for rpciod, which handles the connect | |
313 | * operation. | |
314 | */ | |
315 | xprt->resvport = 1; | |
316 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
317 | xprt->resvport = 0; | |
318 | ||
698b6d08 | 319 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
320 | if (IS_ERR(clnt)) |
321 | return clnt; | |
322 | ||
323 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
150030b7 | 324 | int err = rpc_ping(clnt, RPC_TASK_SOFT); |
c2866763 CL |
325 | if (err != 0) { |
326 | rpc_shutdown_client(clnt); | |
327 | return ERR_PTR(err); | |
328 | } | |
329 | } | |
330 | ||
331 | clnt->cl_softrtry = 1; | |
332 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
333 | clnt->cl_softrtry = 0; | |
334 | ||
c2866763 CL |
335 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
336 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
337 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
338 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
339 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
340 | clnt->cl_chatty = 1; | |
c2866763 CL |
341 | |
342 | return clnt; | |
343 | } | |
b86acd50 | 344 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 345 | |
1da177e4 LT |
346 | /* |
347 | * This function clones the RPC client structure. It allows us to share the | |
348 | * same transport while varying parameters such as the authentication | |
349 | * flavour. | |
350 | */ | |
351 | struct rpc_clnt * | |
352 | rpc_clone_client(struct rpc_clnt *clnt) | |
353 | { | |
354 | struct rpc_clnt *new; | |
3e32a5d9 | 355 | int err = -ENOMEM; |
1da177e4 | 356 | |
e69062b4 | 357 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
358 | if (!new) |
359 | goto out_no_clnt; | |
d431a555 TM |
360 | new->cl_parent = clnt; |
361 | /* Turn off autobind on clones */ | |
362 | new->cl_autobind = 0; | |
363 | INIT_LIST_HEAD(&new->cl_tasks); | |
364 | spin_lock_init(&new->cl_lock); | |
ba7392bb | 365 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
23bf85ba TM |
366 | new->cl_metrics = rpc_alloc_iostats(clnt); |
367 | if (new->cl_metrics == NULL) | |
368 | goto out_no_stats; | |
608207e8 OK |
369 | if (clnt->cl_principal) { |
370 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); | |
371 | if (new->cl_principal == NULL) | |
372 | goto out_no_principal; | |
373 | } | |
34f52e35 | 374 | kref_init(&new->cl_kref); |
3e32a5d9 TM |
375 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
376 | if (err != 0) | |
377 | goto out_no_path; | |
1da177e4 LT |
378 | if (new->cl_auth) |
379 | atomic_inc(&new->cl_auth->au_count); | |
d431a555 TM |
380 | xprt_get(clnt->cl_xprt); |
381 | kref_get(&clnt->cl_kref); | |
6529eba0 | 382 | rpc_register_client(new); |
4ada539e | 383 | rpciod_up(); |
1da177e4 | 384 | return new; |
3e32a5d9 | 385 | out_no_path: |
608207e8 OK |
386 | kfree(new->cl_principal); |
387 | out_no_principal: | |
3e32a5d9 | 388 | rpc_free_iostats(new->cl_metrics); |
23bf85ba TM |
389 | out_no_stats: |
390 | kfree(new); | |
1da177e4 | 391 | out_no_clnt: |
0dc47877 | 392 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 393 | return ERR_PTR(err); |
1da177e4 | 394 | } |
e8914c65 | 395 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 LT |
396 | |
397 | /* | |
398 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 399 | * requests. |
1da177e4 | 400 | */ |
4c402b40 | 401 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 402 | { |
34f52e35 TM |
403 | dprintk("RPC: shutting down %s client for %s\n", |
404 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 | 405 | |
34f52e35 | 406 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 407 | rpc_killall_tasks(clnt); |
532347e2 | 408 | wait_event_timeout(destroy_wait, |
34f52e35 | 409 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
410 | } |
411 | ||
4c402b40 | 412 | rpc_release_client(clnt); |
1da177e4 | 413 | } |
e8914c65 | 414 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
415 | |
416 | /* | |
34f52e35 | 417 | * Free an RPC client |
1da177e4 | 418 | */ |
34f52e35 TM |
419 | static void |
420 | rpc_free_client(struct kref *kref) | |
1da177e4 | 421 | { |
34f52e35 | 422 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); |
1da177e4 | 423 | |
46121cf7 | 424 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 | 425 | clnt->cl_protname, clnt->cl_server); |
8f8e7a50 | 426 | if (!IS_ERR(clnt->cl_dentry)) { |
dff02cc1 | 427 | rpc_rmdir(clnt->cl_dentry); |
8f8e7a50 TM |
428 | rpc_put_mount(); |
429 | } | |
3e32a5d9 | 430 | if (clnt->cl_parent != clnt) { |
8ad7c892 | 431 | rpc_release_client(clnt->cl_parent); |
3e32a5d9 TM |
432 | goto out_free; |
433 | } | |
1da177e4 LT |
434 | if (clnt->cl_server != clnt->cl_inline_name) |
435 | kfree(clnt->cl_server); | |
436 | out_free: | |
6529eba0 | 437 | rpc_unregister_client(clnt); |
11c556b3 | 438 | rpc_free_iostats(clnt->cl_metrics); |
608207e8 | 439 | kfree(clnt->cl_principal); |
11c556b3 | 440 | clnt->cl_metrics = NULL; |
6b6ca86b | 441 | xprt_put(clnt->cl_xprt); |
4ada539e | 442 | rpciod_down(); |
1da177e4 | 443 | kfree(clnt); |
1da177e4 LT |
444 | } |
445 | ||
1dd17ec6 TM |
446 | /* |
447 | * Free an RPC client | |
448 | */ | |
449 | static void | |
450 | rpc_free_auth(struct kref *kref) | |
451 | { | |
452 | struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); | |
453 | ||
454 | if (clnt->cl_auth == NULL) { | |
455 | rpc_free_client(kref); | |
456 | return; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
461 | * release remaining GSS contexts. This mechanism ensures | |
462 | * that it can do so safely. | |
463 | */ | |
464 | kref_init(kref); | |
465 | rpcauth_release(clnt->cl_auth); | |
466 | clnt->cl_auth = NULL; | |
467 | kref_put(kref, rpc_free_client); | |
468 | } | |
469 | ||
1da177e4 | 470 | /* |
34f52e35 | 471 | * Release reference to the RPC client |
1da177e4 LT |
472 | */ |
473 | void | |
474 | rpc_release_client(struct rpc_clnt *clnt) | |
475 | { | |
34f52e35 | 476 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 477 | |
34f52e35 TM |
478 | if (list_empty(&clnt->cl_tasks)) |
479 | wake_up(&destroy_wait); | |
1dd17ec6 | 480 | kref_put(&clnt->cl_kref, rpc_free_auth); |
34f52e35 TM |
481 | } |
482 | ||
007e251f AG |
483 | /** |
484 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
485 | * @old: old rpc_client |
486 | * @program: rpc program to set | |
487 | * @vers: rpc program version | |
007e251f AG |
488 | * |
489 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
490 | * of use for enabling different RPC programs to share the same transport. | |
491 | * The Sun NFSv2/v3 ACL protocol can do this. | |
492 | */ | |
493 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
494 | struct rpc_program *program, | |
89eb21c3 | 495 | u32 vers) |
007e251f AG |
496 | { |
497 | struct rpc_clnt *clnt; | |
498 | struct rpc_version *version; | |
499 | int err; | |
500 | ||
501 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
502 | version = program->version[vers]; | |
503 | clnt = rpc_clone_client(old); | |
504 | if (IS_ERR(clnt)) | |
505 | goto out; | |
506 | clnt->cl_procinfo = version->procs; | |
507 | clnt->cl_maxproc = version->nrprocs; | |
508 | clnt->cl_protname = program->name; | |
509 | clnt->cl_prog = program->number; | |
510 | clnt->cl_vers = version->number; | |
511 | clnt->cl_stats = program->stats; | |
150030b7 | 512 | err = rpc_ping(clnt, RPC_TASK_SOFT); |
007e251f AG |
513 | if (err != 0) { |
514 | rpc_shutdown_client(clnt); | |
515 | clnt = ERR_PTR(err); | |
516 | } | |
cca5172a | 517 | out: |
007e251f AG |
518 | return clnt; |
519 | } | |
e8914c65 | 520 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 521 | |
1da177e4 LT |
522 | /* |
523 | * Default callback for async RPC calls | |
524 | */ | |
525 | static void | |
963d8fe5 | 526 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
527 | { |
528 | } | |
529 | ||
963d8fe5 TM |
530 | static const struct rpc_call_ops rpc_default_ops = { |
531 | .rpc_call_done = rpc_default_callback, | |
532 | }; | |
533 | ||
c970aa85 TM |
534 | /** |
535 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
536 | * @task_setup_data: pointer to task initialisation data | |
537 | */ | |
538 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 TM |
539 | { |
540 | struct rpc_task *task, *ret; | |
6e5b70e9 | 541 | |
84115e1c | 542 | task = rpc_new_task(task_setup_data); |
6e5b70e9 | 543 | if (task == NULL) { |
84115e1c TM |
544 | rpc_release_calldata(task_setup_data->callback_ops, |
545 | task_setup_data->callback_data); | |
50859259 TM |
546 | ret = ERR_PTR(-ENOMEM); |
547 | goto out; | |
6e5b70e9 TM |
548 | } |
549 | ||
b3ef8b3b TM |
550 | if (task->tk_status != 0) { |
551 | ret = ERR_PTR(task->tk_status); | |
552 | rpc_put_task(task); | |
553 | goto out; | |
6e5b70e9 TM |
554 | } |
555 | atomic_inc(&task->tk_count); | |
556 | rpc_execute(task); | |
557 | ret = task; | |
558 | out: | |
6e5b70e9 TM |
559 | return ret; |
560 | } | |
c970aa85 | 561 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
562 | |
563 | /** | |
564 | * rpc_call_sync - Perform a synchronous RPC call | |
565 | * @clnt: pointer to RPC client | |
566 | * @msg: RPC call parameters | |
567 | * @flags: RPC call flags | |
1da177e4 | 568 | */ |
cbc20059 | 569 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
570 | { |
571 | struct rpc_task *task; | |
84115e1c TM |
572 | struct rpc_task_setup task_setup_data = { |
573 | .rpc_client = clnt, | |
574 | .rpc_message = msg, | |
575 | .callback_ops = &rpc_default_ops, | |
576 | .flags = flags, | |
577 | }; | |
6e5b70e9 | 578 | int status; |
1da177e4 | 579 | |
1da177e4 LT |
580 | BUG_ON(flags & RPC_TASK_ASYNC); |
581 | ||
c970aa85 | 582 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
583 | if (IS_ERR(task)) |
584 | return PTR_ERR(task); | |
e60859ac | 585 | status = task->tk_status; |
bde8f00c | 586 | rpc_put_task(task); |
1da177e4 LT |
587 | return status; |
588 | } | |
e8914c65 | 589 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 590 | |
6e5b70e9 TM |
591 | /** |
592 | * rpc_call_async - Perform an asynchronous RPC call | |
593 | * @clnt: pointer to RPC client | |
594 | * @msg: RPC call parameters | |
595 | * @flags: RPC call flags | |
65b6e42c | 596 | * @tk_ops: RPC call ops |
6e5b70e9 | 597 | * @data: user call data |
1da177e4 LT |
598 | */ |
599 | int | |
cbc20059 | 600 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 601 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
602 | { |
603 | struct rpc_task *task; | |
84115e1c TM |
604 | struct rpc_task_setup task_setup_data = { |
605 | .rpc_client = clnt, | |
606 | .rpc_message = msg, | |
607 | .callback_ops = tk_ops, | |
608 | .callback_data = data, | |
609 | .flags = flags|RPC_TASK_ASYNC, | |
610 | }; | |
1da177e4 | 611 | |
c970aa85 | 612 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
613 | if (IS_ERR(task)) |
614 | return PTR_ERR(task); | |
615 | rpc_put_task(task); | |
616 | return 0; | |
1da177e4 | 617 | } |
e8914c65 | 618 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 619 | |
55ae1aab RL |
620 | #if defined(CONFIG_NFS_V4_1) |
621 | /** | |
622 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
623 | * rpc_execute against it | |
624 | * @ops: RPC call ops | |
625 | */ | |
626 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
627 | const struct rpc_call_ops *tk_ops) | |
628 | { | |
629 | struct rpc_task *task; | |
630 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
631 | struct rpc_task_setup task_setup_data = { | |
632 | .callback_ops = tk_ops, | |
633 | }; | |
634 | ||
635 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
636 | /* | |
637 | * Create an rpc_task to send the data | |
638 | */ | |
639 | task = rpc_new_task(&task_setup_data); | |
640 | if (!task) { | |
641 | xprt_free_bc_request(req); | |
642 | goto out; | |
643 | } | |
644 | task->tk_rqstp = req; | |
645 | ||
646 | /* | |
647 | * Set up the xdr_buf length. | |
648 | * This also indicates that the buffer is XDR encoded already. | |
649 | */ | |
650 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
651 | xbufp->tail[0].iov_len; | |
652 | ||
653 | task->tk_action = call_bc_transmit; | |
654 | atomic_inc(&task->tk_count); | |
655 | BUG_ON(atomic_read(&task->tk_count) != 2); | |
656 | rpc_execute(task); | |
657 | ||
658 | out: | |
659 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
660 | return task; | |
661 | } | |
662 | #endif /* CONFIG_NFS_V4_1 */ | |
663 | ||
77de2c59 TM |
664 | void |
665 | rpc_call_start(struct rpc_task *task) | |
666 | { | |
667 | task->tk_action = call_start; | |
668 | } | |
669 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
670 | ||
ed39440a CL |
671 | /** |
672 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
673 | * @clnt: RPC client structure | |
674 | * @buf: target buffer | |
65b6e42c | 675 | * @bufsize: length of target buffer |
ed39440a CL |
676 | * |
677 | * Returns the number of bytes that are actually in the stored address. | |
678 | */ | |
679 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
680 | { | |
681 | size_t bytes; | |
682 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
683 | ||
684 | bytes = sizeof(xprt->addr); | |
685 | if (bytes > bufsize) | |
686 | bytes = bufsize; | |
687 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 688 | return xprt->addrlen; |
ed39440a | 689 | } |
b86acd50 | 690 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 691 | |
f425eba4 CL |
692 | /** |
693 | * rpc_peeraddr2str - return remote peer address in printable format | |
694 | * @clnt: RPC client structure | |
695 | * @format: address format | |
696 | * | |
697 | */ | |
b454ae90 CL |
698 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
699 | enum rpc_display_format_t format) | |
f425eba4 CL |
700 | { |
701 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
702 | |
703 | if (xprt->address_strings[format] != NULL) | |
704 | return xprt->address_strings[format]; | |
705 | else | |
706 | return "unprintable"; | |
f425eba4 | 707 | } |
b86acd50 | 708 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 709 | |
1da177e4 LT |
710 | void |
711 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
712 | { | |
713 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
714 | if (xprt->ops->set_buffer_size) |
715 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 | 716 | } |
e8914c65 | 717 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 LT |
718 | |
719 | /* | |
720 | * Return size of largest payload RPC client can support, in bytes | |
721 | * | |
722 | * For stream transports, this is one RPC record fragment (see RFC | |
723 | * 1831), as we don't support multi-record requests yet. For datagram | |
724 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
725 | * RPC header sizes. | |
726 | */ | |
727 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
728 | { | |
729 | return clnt->cl_xprt->max_payload; | |
730 | } | |
b86acd50 | 731 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 732 | |
35f5a422 CL |
733 | /** |
734 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
735 | * @clnt: client to rebind | |
736 | * | |
737 | */ | |
738 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
739 | { | |
740 | if (clnt->cl_autobind) | |
ec739ef0 | 741 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 742 | } |
b86acd50 | 743 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 744 | |
aae2006e AA |
745 | /* |
746 | * Restart an (async) RPC call from the call_prepare state. | |
747 | * Usually called from within the exit handler. | |
748 | */ | |
749 | void | |
750 | rpc_restart_call_prepare(struct rpc_task *task) | |
751 | { | |
752 | if (RPC_ASSASSINATED(task)) | |
753 | return; | |
754 | task->tk_action = rpc_prepare_task; | |
755 | } | |
756 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
757 | ||
1da177e4 LT |
758 | /* |
759 | * Restart an (async) RPC call. Usually called from within the | |
760 | * exit handler. | |
761 | */ | |
762 | void | |
763 | rpc_restart_call(struct rpc_task *task) | |
764 | { | |
765 | if (RPC_ASSASSINATED(task)) | |
766 | return; | |
767 | ||
768 | task->tk_action = call_start; | |
769 | } | |
e8914c65 | 770 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 771 | |
3748f1e4 CL |
772 | #ifdef RPC_DEBUG |
773 | static const char *rpc_proc_name(const struct rpc_task *task) | |
774 | { | |
775 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
776 | ||
777 | if (proc) { | |
778 | if (proc->p_name) | |
779 | return proc->p_name; | |
780 | else | |
781 | return "NULL"; | |
782 | } else | |
783 | return "no proc"; | |
784 | } | |
785 | #endif | |
786 | ||
1da177e4 LT |
787 | /* |
788 | * 0. Initial state | |
789 | * | |
790 | * Other FSM states can be visited zero or more times, but | |
791 | * this state is visited exactly once for each RPC. | |
792 | */ | |
793 | static void | |
794 | call_start(struct rpc_task *task) | |
795 | { | |
796 | struct rpc_clnt *clnt = task->tk_client; | |
797 | ||
3748f1e4 | 798 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
46121cf7 | 799 | clnt->cl_protname, clnt->cl_vers, |
3748f1e4 | 800 | rpc_proc_name(task), |
46121cf7 | 801 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
802 | |
803 | /* Increment call count */ | |
804 | task->tk_msg.rpc_proc->p_count++; | |
805 | clnt->cl_stats->rpccnt++; | |
806 | task->tk_action = call_reserve; | |
807 | } | |
808 | ||
809 | /* | |
810 | * 1. Reserve an RPC call slot | |
811 | */ | |
812 | static void | |
813 | call_reserve(struct rpc_task *task) | |
814 | { | |
46121cf7 | 815 | dprint_status(task); |
1da177e4 LT |
816 | |
817 | if (!rpcauth_uptodatecred(task)) { | |
818 | task->tk_action = call_refresh; | |
819 | return; | |
820 | } | |
821 | ||
822 | task->tk_status = 0; | |
823 | task->tk_action = call_reserveresult; | |
824 | xprt_reserve(task); | |
825 | } | |
826 | ||
827 | /* | |
828 | * 1b. Grok the result of xprt_reserve() | |
829 | */ | |
830 | static void | |
831 | call_reserveresult(struct rpc_task *task) | |
832 | { | |
833 | int status = task->tk_status; | |
834 | ||
46121cf7 | 835 | dprint_status(task); |
1da177e4 LT |
836 | |
837 | /* | |
838 | * After a call to xprt_reserve(), we must have either | |
839 | * a request slot or else an error status. | |
840 | */ | |
841 | task->tk_status = 0; | |
842 | if (status >= 0) { | |
843 | if (task->tk_rqstp) { | |
844 | task->tk_action = call_allocate; | |
845 | return; | |
846 | } | |
847 | ||
848 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 849 | __func__, status); |
1da177e4 LT |
850 | rpc_exit(task, -EIO); |
851 | return; | |
852 | } | |
853 | ||
854 | /* | |
855 | * Even though there was an error, we may have acquired | |
856 | * a request slot somehow. Make sure not to leak it. | |
857 | */ | |
858 | if (task->tk_rqstp) { | |
859 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 860 | __func__, status); |
1da177e4 LT |
861 | xprt_release(task); |
862 | } | |
863 | ||
864 | switch (status) { | |
865 | case -EAGAIN: /* woken up; retry */ | |
866 | task->tk_action = call_reserve; | |
867 | return; | |
868 | case -EIO: /* probably a shutdown */ | |
869 | break; | |
870 | default: | |
871 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 872 | __func__, status); |
1da177e4 LT |
873 | break; |
874 | } | |
875 | rpc_exit(task, status); | |
876 | } | |
877 | ||
878 | /* | |
879 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 880 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
881 | */ |
882 | static void | |
883 | call_allocate(struct rpc_task *task) | |
884 | { | |
1be27f36 | 885 | unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; |
02107148 CL |
886 | struct rpc_rqst *req = task->tk_rqstp; |
887 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 888 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 889 | |
46121cf7 CL |
890 | dprint_status(task); |
891 | ||
2bea90d4 | 892 | task->tk_status = 0; |
1da177e4 | 893 | task->tk_action = call_bind; |
2bea90d4 | 894 | |
02107148 | 895 | if (req->rq_buffer) |
1da177e4 LT |
896 | return; |
897 | ||
2bea90d4 CL |
898 | if (proc->p_proc != 0) { |
899 | BUG_ON(proc->p_arglen == 0); | |
900 | if (proc->p_decode != NULL) | |
901 | BUG_ON(proc->p_replen == 0); | |
902 | } | |
1da177e4 | 903 | |
2bea90d4 CL |
904 | /* |
905 | * Calculate the size (in quads) of the RPC call | |
906 | * and reply headers, and convert both values | |
907 | * to byte sizes. | |
908 | */ | |
909 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
910 | req->rq_callsize <<= 2; | |
911 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
912 | req->rq_rcvsize <<= 2; | |
913 | ||
c5a4dd8b CL |
914 | req->rq_buffer = xprt->ops->buf_alloc(task, |
915 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 916 | if (req->rq_buffer != NULL) |
1da177e4 | 917 | return; |
46121cf7 CL |
918 | |
919 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 920 | |
14b218a8 | 921 | if (RPC_IS_ASYNC(task) || !signalled()) { |
b6e9c713 | 922 | task->tk_action = call_allocate; |
1da177e4 LT |
923 | rpc_delay(task, HZ>>4); |
924 | return; | |
925 | } | |
926 | ||
927 | rpc_exit(task, -ERESTARTSYS); | |
928 | } | |
929 | ||
940e3318 TM |
930 | static inline int |
931 | rpc_task_need_encode(struct rpc_task *task) | |
932 | { | |
933 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
934 | } | |
935 | ||
936 | static inline void | |
937 | rpc_task_force_reencode(struct rpc_task *task) | |
938 | { | |
939 | task->tk_rqstp->rq_snd_buf.len = 0; | |
940 | } | |
941 | ||
2bea90d4 CL |
942 | static inline void |
943 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
944 | { | |
945 | buf->head[0].iov_base = start; | |
946 | buf->head[0].iov_len = len; | |
947 | buf->tail[0].iov_len = 0; | |
948 | buf->page_len = 0; | |
4f22ccc3 | 949 | buf->flags = 0; |
2bea90d4 CL |
950 | buf->len = 0; |
951 | buf->buflen = len; | |
952 | } | |
953 | ||
1da177e4 LT |
954 | /* |
955 | * 3. Encode arguments of an RPC call | |
956 | */ | |
957 | static void | |
b0e1c57e | 958 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 959 | { |
1da177e4 | 960 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 961 | kxdrproc_t encode; |
d8ed029d | 962 | __be32 *p; |
1da177e4 | 963 | |
46121cf7 | 964 | dprint_status(task); |
1da177e4 | 965 | |
2bea90d4 CL |
966 | rpc_xdr_buf_init(&req->rq_snd_buf, |
967 | req->rq_buffer, | |
968 | req->rq_callsize); | |
969 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
970 | (char *)req->rq_buffer + req->rq_callsize, | |
971 | req->rq_rcvsize); | |
1da177e4 | 972 | |
b0e1c57e CL |
973 | p = rpc_encode_header(task); |
974 | if (p == NULL) { | |
975 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
976 | rpc_exit(task, -EIO); |
977 | return; | |
978 | } | |
b0e1c57e CL |
979 | |
980 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
981 | if (encode == NULL) |
982 | return; | |
983 | ||
984 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
985 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
986 | } |
987 | ||
988 | /* | |
989 | * 4. Get the server port number if not yet set | |
990 | */ | |
991 | static void | |
992 | call_bind(struct rpc_task *task) | |
993 | { | |
ec739ef0 | 994 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 995 | |
46121cf7 | 996 | dprint_status(task); |
1da177e4 | 997 | |
da351878 | 998 | task->tk_action = call_connect; |
ec739ef0 | 999 | if (!xprt_bound(xprt)) { |
da351878 | 1000 | task->tk_action = call_bind_status; |
ec739ef0 | 1001 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1002 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1003 | } |
1004 | } | |
1005 | ||
1006 | /* | |
da351878 CL |
1007 | * 4a. Sort out bind result |
1008 | */ | |
1009 | static void | |
1010 | call_bind_status(struct rpc_task *task) | |
1011 | { | |
906462af | 1012 | int status = -EIO; |
da351878 CL |
1013 | |
1014 | if (task->tk_status >= 0) { | |
46121cf7 | 1015 | dprint_status(task); |
da351878 CL |
1016 | task->tk_status = 0; |
1017 | task->tk_action = call_connect; | |
1018 | return; | |
1019 | } | |
1020 | ||
1021 | switch (task->tk_status) { | |
381ba74a TM |
1022 | case -ENOMEM: |
1023 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1024 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1025 | goto retry_timeout; |
da351878 | 1026 | case -EACCES: |
46121cf7 CL |
1027 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1028 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1029 | /* fail immediately if this is an RPC ping */ |
1030 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1031 | status = -EOPNOTSUPP; | |
1032 | break; | |
1033 | } | |
ea635a51 | 1034 | rpc_delay(task, 3*HZ); |
da45828e | 1035 | goto retry_timeout; |
da351878 | 1036 | case -ETIMEDOUT: |
46121cf7 | 1037 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1038 | task->tk_pid); |
da45828e | 1039 | goto retry_timeout; |
da351878 | 1040 | case -EPFNOSUPPORT: |
906462af | 1041 | /* server doesn't support any rpcbind version we know of */ |
46121cf7 | 1042 | dprintk("RPC: %5u remote rpcbind service unavailable\n", |
da351878 CL |
1043 | task->tk_pid); |
1044 | break; | |
1045 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1046 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1047 | task->tk_pid); |
00a6e7bb CL |
1048 | task->tk_status = 0; |
1049 | task->tk_action = call_bind; | |
1050 | return; | |
da351878 | 1051 | default: |
46121cf7 | 1052 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1053 | task->tk_pid, -task->tk_status); |
da351878 CL |
1054 | } |
1055 | ||
1056 | rpc_exit(task, status); | |
1057 | return; | |
1058 | ||
da45828e TM |
1059 | retry_timeout: |
1060 | task->tk_action = call_timeout; | |
da351878 CL |
1061 | } |
1062 | ||
1063 | /* | |
1064 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1065 | */ |
1066 | static void | |
1067 | call_connect(struct rpc_task *task) | |
1068 | { | |
da351878 | 1069 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1070 | |
46121cf7 | 1071 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1072 | task->tk_pid, xprt, |
1073 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1074 | |
da351878 CL |
1075 | task->tk_action = call_transmit; |
1076 | if (!xprt_connected(xprt)) { | |
1077 | task->tk_action = call_connect_status; | |
1078 | if (task->tk_status < 0) | |
1079 | return; | |
1080 | xprt_connect(task); | |
1da177e4 | 1081 | } |
1da177e4 LT |
1082 | } |
1083 | ||
1084 | /* | |
da351878 | 1085 | * 4c. Sort out connect result |
1da177e4 LT |
1086 | */ |
1087 | static void | |
1088 | call_connect_status(struct rpc_task *task) | |
1089 | { | |
1090 | struct rpc_clnt *clnt = task->tk_client; | |
1091 | int status = task->tk_status; | |
1092 | ||
46121cf7 | 1093 | dprint_status(task); |
da351878 | 1094 | |
1da177e4 | 1095 | task->tk_status = 0; |
2a491991 | 1096 | if (status >= 0 || status == -EAGAIN) { |
1da177e4 LT |
1097 | clnt->cl_stats->netreconn++; |
1098 | task->tk_action = call_transmit; | |
1099 | return; | |
1100 | } | |
1101 | ||
1da177e4 | 1102 | switch (status) { |
da45828e TM |
1103 | /* if soft mounted, test if we've timed out */ |
1104 | case -ETIMEDOUT: | |
1105 | task->tk_action = call_timeout; | |
2a491991 TM |
1106 | break; |
1107 | default: | |
1108 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1109 | } |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * 5. Transmit the RPC request, and wait for reply | |
1114 | */ | |
1115 | static void | |
1116 | call_transmit(struct rpc_task *task) | |
1117 | { | |
46121cf7 | 1118 | dprint_status(task); |
1da177e4 LT |
1119 | |
1120 | task->tk_action = call_status; | |
1121 | if (task->tk_status < 0) | |
1122 | return; | |
1123 | task->tk_status = xprt_prepare_transmit(task); | |
1124 | if (task->tk_status != 0) | |
1125 | return; | |
e0ab53de | 1126 | task->tk_action = call_transmit_status; |
1da177e4 | 1127 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1128 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1129 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
b0e1c57e | 1130 | rpc_xdr_encode(task); |
5e5ce5be | 1131 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1132 | if (task->tk_status != 0) { |
1133 | /* Was the error nonfatal? */ | |
1134 | if (task->tk_status == -EAGAIN) | |
1135 | rpc_delay(task, HZ >> 4); | |
1136 | else | |
1137 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1138 | return; |
8b39f2b4 | 1139 | } |
5e5ce5be | 1140 | } |
1da177e4 LT |
1141 | xprt_transmit(task); |
1142 | if (task->tk_status < 0) | |
1143 | return; | |
e0ab53de TM |
1144 | /* |
1145 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1146 | * in order to allow access to the socket to other RPC requests. | |
1147 | */ | |
1148 | call_transmit_status(task); | |
55ae1aab | 1149 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1150 | return; |
1151 | task->tk_action = rpc_exit_task; | |
fda13939 | 1152 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
e0ab53de TM |
1153 | } |
1154 | ||
1155 | /* | |
1156 | * 5a. Handle cleanup after a transmission | |
1157 | */ | |
1158 | static void | |
1159 | call_transmit_status(struct rpc_task *task) | |
1160 | { | |
1161 | task->tk_action = call_status; | |
15f081ca TM |
1162 | switch (task->tk_status) { |
1163 | case -EAGAIN: | |
1164 | break; | |
1165 | default: | |
1166 | xprt_end_transmit(task); | |
1167 | /* | |
1168 | * Special cases: if we've been waiting on the | |
1169 | * socket's write_space() callback, or if the | |
1170 | * socket just returned a connection error, | |
1171 | * then hold onto the transport lock. | |
1172 | */ | |
1173 | case -ECONNREFUSED: | |
c8485e4d | 1174 | case -ECONNRESET: |
15f081ca TM |
1175 | case -ENOTCONN: |
1176 | case -EHOSTDOWN: | |
1177 | case -EHOSTUNREACH: | |
1178 | case -ENETUNREACH: | |
c8485e4d | 1179 | case -EPIPE: |
15f081ca TM |
1180 | rpc_task_force_reencode(task); |
1181 | } | |
1da177e4 LT |
1182 | } |
1183 | ||
55ae1aab RL |
1184 | #if defined(CONFIG_NFS_V4_1) |
1185 | /* | |
1186 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1187 | * addition, disconnect on connectivity errors. | |
1188 | */ | |
1189 | static void | |
1190 | call_bc_transmit(struct rpc_task *task) | |
1191 | { | |
1192 | struct rpc_rqst *req = task->tk_rqstp; | |
1193 | ||
1194 | BUG_ON(task->tk_status != 0); | |
1195 | task->tk_status = xprt_prepare_transmit(task); | |
1196 | if (task->tk_status == -EAGAIN) { | |
1197 | /* | |
1198 | * Could not reserve the transport. Try again after the | |
1199 | * transport is released. | |
1200 | */ | |
1201 | task->tk_status = 0; | |
1202 | task->tk_action = call_bc_transmit; | |
1203 | return; | |
1204 | } | |
1205 | ||
1206 | task->tk_action = rpc_exit_task; | |
1207 | if (task->tk_status < 0) { | |
1208 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1209 | "error: %d\n", task->tk_status); | |
1210 | return; | |
1211 | } | |
1212 | ||
1213 | xprt_transmit(task); | |
1214 | xprt_end_transmit(task); | |
1215 | dprint_status(task); | |
1216 | switch (task->tk_status) { | |
1217 | case 0: | |
1218 | /* Success */ | |
1219 | break; | |
1220 | case -EHOSTDOWN: | |
1221 | case -EHOSTUNREACH: | |
1222 | case -ENETUNREACH: | |
1223 | case -ETIMEDOUT: | |
1224 | /* | |
1225 | * Problem reaching the server. Disconnect and let the | |
1226 | * forechannel reestablish the connection. The server will | |
1227 | * have to retransmit the backchannel request and we'll | |
1228 | * reprocess it. Since these ops are idempotent, there's no | |
1229 | * need to cache our reply at this time. | |
1230 | */ | |
1231 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1232 | "error: %d\n", task->tk_status); | |
1233 | xprt_conditional_disconnect(task->tk_xprt, | |
1234 | req->rq_connect_cookie); | |
1235 | break; | |
1236 | default: | |
1237 | /* | |
1238 | * We were unable to reply and will have to drop the | |
1239 | * request. The server should reconnect and retransmit. | |
1240 | */ | |
1241 | BUG_ON(task->tk_status == -EAGAIN); | |
1242 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1243 | "error: %d\n", task->tk_status); | |
1244 | break; | |
1245 | } | |
1246 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1247 | } | |
1248 | #endif /* CONFIG_NFS_V4_1 */ | |
1249 | ||
1da177e4 LT |
1250 | /* |
1251 | * 6. Sort out the RPC call status | |
1252 | */ | |
1253 | static void | |
1254 | call_status(struct rpc_task *task) | |
1255 | { | |
1256 | struct rpc_clnt *clnt = task->tk_client; | |
1257 | struct rpc_rqst *req = task->tk_rqstp; | |
1258 | int status; | |
1259 | ||
dd2b63d0 RL |
1260 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1261 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1262 | |
46121cf7 | 1263 | dprint_status(task); |
1da177e4 LT |
1264 | |
1265 | status = task->tk_status; | |
1266 | if (status >= 0) { | |
1267 | task->tk_action = call_decode; | |
1268 | return; | |
1269 | } | |
1270 | ||
1271 | task->tk_status = 0; | |
1272 | switch(status) { | |
76303992 TM |
1273 | case -EHOSTDOWN: |
1274 | case -EHOSTUNREACH: | |
1275 | case -ENETUNREACH: | |
1276 | /* | |
1277 | * Delay any retries for 3 seconds, then handle as if it | |
1278 | * were a timeout. | |
1279 | */ | |
1280 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1281 | case -ETIMEDOUT: |
1282 | task->tk_action = call_timeout; | |
241c39b9 | 1283 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1284 | xprt_conditional_disconnect(task->tk_xprt, |
1285 | req->rq_connect_cookie); | |
1da177e4 | 1286 | break; |
c8485e4d | 1287 | case -ECONNRESET: |
1da177e4 | 1288 | case -ECONNREFUSED: |
35f5a422 | 1289 | rpc_force_rebind(clnt); |
c8485e4d TM |
1290 | rpc_delay(task, 3*HZ); |
1291 | case -EPIPE: | |
1292 | case -ENOTCONN: | |
1da177e4 LT |
1293 | task->tk_action = call_bind; |
1294 | break; | |
1295 | case -EAGAIN: | |
1296 | task->tk_action = call_transmit; | |
1297 | break; | |
1298 | case -EIO: | |
1299 | /* shutdown or soft timeout */ | |
1300 | rpc_exit(task, status); | |
1301 | break; | |
1302 | default: | |
b6b6152c OK |
1303 | if (clnt->cl_chatty) |
1304 | printk("%s: RPC call returned error %d\n", | |
1da177e4 LT |
1305 | clnt->cl_protname, -status); |
1306 | rpc_exit(task, status); | |
1da177e4 LT |
1307 | } |
1308 | } | |
1309 | ||
1310 | /* | |
e0ab53de | 1311 | * 6a. Handle RPC timeout |
1da177e4 LT |
1312 | * We do not release the request slot, so we keep using the |
1313 | * same XID for all retransmits. | |
1314 | */ | |
1315 | static void | |
1316 | call_timeout(struct rpc_task *task) | |
1317 | { | |
1318 | struct rpc_clnt *clnt = task->tk_client; | |
1319 | ||
1320 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1321 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1322 | goto retry; |
1323 | } | |
1324 | ||
46121cf7 | 1325 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1326 | task->tk_timeouts++; |
1327 | ||
1da177e4 | 1328 | if (RPC_IS_SOFT(task)) { |
b6b6152c OK |
1329 | if (clnt->cl_chatty) |
1330 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", | |
1da177e4 LT |
1331 | clnt->cl_protname, clnt->cl_server); |
1332 | rpc_exit(task, -EIO); | |
1333 | return; | |
1334 | } | |
1335 | ||
f518e35a | 1336 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1337 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
b6b6152c OK |
1338 | if (clnt->cl_chatty) |
1339 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1da177e4 LT |
1340 | clnt->cl_protname, clnt->cl_server); |
1341 | } | |
35f5a422 | 1342 | rpc_force_rebind(clnt); |
b48633bd TM |
1343 | /* |
1344 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1345 | * event? RFC2203 requires the server to drop all such requests. | |
1346 | */ | |
1347 | rpcauth_invalcred(task); | |
1da177e4 LT |
1348 | |
1349 | retry: | |
1350 | clnt->cl_stats->rpcretrans++; | |
1351 | task->tk_action = call_bind; | |
1352 | task->tk_status = 0; | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * 7. Decode the RPC reply | |
1357 | */ | |
1358 | static void | |
1359 | call_decode(struct rpc_task *task) | |
1360 | { | |
1361 | struct rpc_clnt *clnt = task->tk_client; | |
1362 | struct rpc_rqst *req = task->tk_rqstp; | |
1363 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1364 | __be32 *p; |
1da177e4 | 1365 | |
46121cf7 CL |
1366 | dprintk("RPC: %5u call_decode (status %d)\n", |
1367 | task->tk_pid, task->tk_status); | |
1da177e4 | 1368 | |
f518e35a | 1369 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
b6b6152c OK |
1370 | if (clnt->cl_chatty) |
1371 | printk(KERN_NOTICE "%s: server %s OK\n", | |
1372 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 LT |
1373 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1374 | } | |
1375 | ||
43ac3f29 TM |
1376 | /* |
1377 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 1378 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
1379 | */ |
1380 | smp_rmb(); | |
1da177e4 LT |
1381 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1382 | ||
1383 | /* Check that the softirq receive buffer is valid */ | |
1384 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1385 | sizeof(req->rq_rcv_buf)) != 0); | |
1386 | ||
1e799b67 TM |
1387 | if (req->rq_rcv_buf.len < 12) { |
1388 | if (!RPC_IS_SOFT(task)) { | |
1389 | task->tk_action = call_bind; | |
1390 | clnt->cl_stats->rpcretrans++; | |
1391 | goto out_retry; | |
1392 | } | |
1393 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
1394 | clnt->cl_protname, task->tk_status); | |
1395 | task->tk_action = call_timeout; | |
1396 | goto out_retry; | |
1397 | } | |
1398 | ||
b0e1c57e | 1399 | p = rpc_verify_header(task); |
abbcf28f TM |
1400 | if (IS_ERR(p)) { |
1401 | if (p == ERR_PTR(-EAGAIN)) | |
1402 | goto out_retry; | |
1403 | return; | |
1da177e4 LT |
1404 | } |
1405 | ||
abbcf28f | 1406 | task->tk_action = rpc_exit_task; |
1da177e4 | 1407 | |
6d5fcb5a | 1408 | if (decode) { |
1da177e4 LT |
1409 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1410 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1411 | } |
46121cf7 CL |
1412 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1413 | task->tk_status); | |
1da177e4 LT |
1414 | return; |
1415 | out_retry: | |
1da177e4 | 1416 | task->tk_status = 0; |
b0e1c57e | 1417 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 1418 | if (task->tk_rqstp == req) { |
dd2b63d0 | 1419 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 1420 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1421 | xprt_conditional_disconnect(task->tk_xprt, |
1422 | req->rq_connect_cookie); | |
24b74bf0 | 1423 | } |
1da177e4 LT |
1424 | } |
1425 | ||
1426 | /* | |
1427 | * 8. Refresh the credentials if rejected by the server | |
1428 | */ | |
1429 | static void | |
1430 | call_refresh(struct rpc_task *task) | |
1431 | { | |
46121cf7 | 1432 | dprint_status(task); |
1da177e4 | 1433 | |
1da177e4 LT |
1434 | task->tk_action = call_refreshresult; |
1435 | task->tk_status = 0; | |
1436 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1437 | rpcauth_refreshcred(task); | |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * 8a. Process the results of a credential refresh | |
1442 | */ | |
1443 | static void | |
1444 | call_refreshresult(struct rpc_task *task) | |
1445 | { | |
1446 | int status = task->tk_status; | |
46121cf7 CL |
1447 | |
1448 | dprint_status(task); | |
1da177e4 LT |
1449 | |
1450 | task->tk_status = 0; | |
1451 | task->tk_action = call_reserve; | |
1452 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1453 | return; | |
1454 | if (status == -EACCES) { | |
1455 | rpc_exit(task, -EACCES); | |
1456 | return; | |
1457 | } | |
1458 | task->tk_action = call_refresh; | |
1459 | if (status != -ETIMEDOUT) | |
1460 | rpc_delay(task, 3*HZ); | |
1461 | return; | |
1462 | } | |
1463 | ||
d8ed029d | 1464 | static __be32 * |
b0e1c57e | 1465 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
1466 | { |
1467 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1468 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1469 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1470 | |
1471 | /* FIXME: check buffer size? */ | |
808012fb CL |
1472 | |
1473 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1474 | *p++ = req->rq_xid; /* XID */ |
1475 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1476 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1477 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1478 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1479 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1480 | p = rpcauth_marshcred(task, p); |
1481 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1482 | return p; | |
1da177e4 LT |
1483 | } |
1484 | ||
d8ed029d | 1485 | static __be32 * |
b0e1c57e | 1486 | rpc_verify_header(struct rpc_task *task) |
1da177e4 LT |
1487 | { |
1488 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1489 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1490 | __be32 *p = iov->iov_base; |
1491 | u32 n; | |
1da177e4 LT |
1492 | int error = -EACCES; |
1493 | ||
e8896495 DH |
1494 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1495 | /* RFC-1014 says that the representation of XDR data must be a | |
1496 | * multiple of four bytes | |
1497 | * - if it isn't pointer subtraction in the NFS client may give | |
1498 | * undefined results | |
1499 | */ | |
8a702bbb | 1500 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 1501 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 1502 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
1503 | goto out_eio; |
1504 | } | |
1da177e4 LT |
1505 | if ((len -= 3) < 0) |
1506 | goto out_overflow; | |
1da177e4 | 1507 | |
f4a2e418 | 1508 | p += 1; /* skip XID */ |
1da177e4 | 1509 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 1510 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 1511 | task->tk_pid, __func__, n); |
abbcf28f | 1512 | goto out_garbage; |
1da177e4 | 1513 | } |
f4a2e418 | 1514 | |
1da177e4 LT |
1515 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
1516 | if (--len < 0) | |
1517 | goto out_overflow; | |
1518 | switch ((n = ntohl(*p++))) { | |
1519 | case RPC_AUTH_ERROR: | |
1520 | break; | |
1521 | case RPC_MISMATCH: | |
46121cf7 CL |
1522 | dprintk("RPC: %5u %s: RPC call version " |
1523 | "mismatch!\n", | |
0dc47877 | 1524 | task->tk_pid, __func__); |
cdf47706 AG |
1525 | error = -EPROTONOSUPPORT; |
1526 | goto out_err; | |
1da177e4 | 1527 | default: |
46121cf7 CL |
1528 | dprintk("RPC: %5u %s: RPC call rejected, " |
1529 | "unknown error: %x\n", | |
0dc47877 | 1530 | task->tk_pid, __func__, n); |
1da177e4 LT |
1531 | goto out_eio; |
1532 | } | |
1533 | if (--len < 0) | |
1534 | goto out_overflow; | |
1535 | switch ((n = ntohl(*p++))) { | |
1536 | case RPC_AUTH_REJECTEDCRED: | |
1537 | case RPC_AUTH_REJECTEDVERF: | |
1538 | case RPCSEC_GSS_CREDPROBLEM: | |
1539 | case RPCSEC_GSS_CTXPROBLEM: | |
1540 | if (!task->tk_cred_retry) | |
1541 | break; | |
1542 | task->tk_cred_retry--; | |
46121cf7 | 1543 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 1544 | task->tk_pid, __func__); |
1da177e4 | 1545 | rpcauth_invalcred(task); |
220bcc2a TM |
1546 | /* Ensure we obtain a new XID! */ |
1547 | xprt_release(task); | |
1da177e4 | 1548 | task->tk_action = call_refresh; |
abbcf28f | 1549 | goto out_retry; |
1da177e4 LT |
1550 | case RPC_AUTH_BADCRED: |
1551 | case RPC_AUTH_BADVERF: | |
1552 | /* possibly garbled cred/verf? */ | |
1553 | if (!task->tk_garb_retry) | |
1554 | break; | |
1555 | task->tk_garb_retry--; | |
46121cf7 | 1556 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 1557 | task->tk_pid, __func__); |
1da177e4 | 1558 | task->tk_action = call_bind; |
abbcf28f | 1559 | goto out_retry; |
1da177e4 | 1560 | case RPC_AUTH_TOOWEAK: |
b0e1c57e | 1561 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
1356b8c2 | 1562 | "authentication.\n", task->tk_client->cl_server); |
1da177e4 LT |
1563 | break; |
1564 | default: | |
8a702bbb | 1565 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 1566 | task->tk_pid, __func__, n); |
1da177e4 LT |
1567 | error = -EIO; |
1568 | } | |
46121cf7 | 1569 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 1570 | task->tk_pid, __func__, n); |
1da177e4 LT |
1571 | goto out_err; |
1572 | } | |
1573 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 1574 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 1575 | task->tk_pid, __func__); |
abbcf28f | 1576 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1577 | } |
d8ed029d | 1578 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1579 | if (len < 0) |
1580 | goto out_overflow; | |
1581 | switch ((n = ntohl(*p++))) { | |
1582 | case RPC_SUCCESS: | |
1583 | return p; | |
1584 | case RPC_PROG_UNAVAIL: | |
46121cf7 | 1585 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
0dc47877 | 1586 | task->tk_pid, __func__, |
1da177e4 LT |
1587 | (unsigned int)task->tk_client->cl_prog, |
1588 | task->tk_client->cl_server); | |
cdf47706 AG |
1589 | error = -EPFNOSUPPORT; |
1590 | goto out_err; | |
1da177e4 | 1591 | case RPC_PROG_MISMATCH: |
46121cf7 | 1592 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
0dc47877 | 1593 | "server %s\n", task->tk_pid, __func__, |
1da177e4 LT |
1594 | (unsigned int)task->tk_client->cl_prog, |
1595 | (unsigned int)task->tk_client->cl_vers, | |
1596 | task->tk_client->cl_server); | |
cdf47706 AG |
1597 | error = -EPROTONOSUPPORT; |
1598 | goto out_err; | |
1da177e4 | 1599 | case RPC_PROC_UNAVAIL: |
3748f1e4 | 1600 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 1601 | "version %u on server %s\n", |
0dc47877 | 1602 | task->tk_pid, __func__, |
3748f1e4 | 1603 | rpc_proc_name(task), |
1da177e4 LT |
1604 | task->tk_client->cl_prog, |
1605 | task->tk_client->cl_vers, | |
1606 | task->tk_client->cl_server); | |
cdf47706 AG |
1607 | error = -EOPNOTSUPP; |
1608 | goto out_err; | |
1da177e4 | 1609 | case RPC_GARBAGE_ARGS: |
46121cf7 | 1610 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 1611 | task->tk_pid, __func__); |
1da177e4 LT |
1612 | break; /* retry */ |
1613 | default: | |
8a702bbb | 1614 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 1615 | task->tk_pid, __func__, n); |
1da177e4 LT |
1616 | /* Also retry */ |
1617 | } | |
1618 | ||
abbcf28f | 1619 | out_garbage: |
1da177e4 LT |
1620 | task->tk_client->cl_stats->rpcgarbage++; |
1621 | if (task->tk_garb_retry) { | |
1622 | task->tk_garb_retry--; | |
46121cf7 | 1623 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 1624 | task->tk_pid, __func__); |
1da177e4 | 1625 | task->tk_action = call_bind; |
abbcf28f TM |
1626 | out_retry: |
1627 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 1628 | } |
1da177e4 LT |
1629 | out_eio: |
1630 | error = -EIO; | |
1631 | out_err: | |
1632 | rpc_exit(task, error); | |
8a702bbb | 1633 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 1634 | __func__, error); |
abbcf28f | 1635 | return ERR_PTR(error); |
1da177e4 | 1636 | out_overflow: |
8a702bbb | 1637 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 1638 | __func__); |
abbcf28f | 1639 | goto out_garbage; |
1da177e4 | 1640 | } |
5ee0ed7d | 1641 | |
d8ed029d | 1642 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1643 | { |
1644 | return 0; | |
1645 | } | |
1646 | ||
d8ed029d | 1647 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1648 | { |
1649 | return 0; | |
1650 | } | |
1651 | ||
1652 | static struct rpc_procinfo rpcproc_null = { | |
1653 | .p_encode = rpcproc_encode_null, | |
1654 | .p_decode = rpcproc_decode_null, | |
1655 | }; | |
1656 | ||
64c91a1f | 1657 | static int rpc_ping(struct rpc_clnt *clnt, int flags) |
5ee0ed7d TM |
1658 | { |
1659 | struct rpc_message msg = { | |
1660 | .rpc_proc = &rpcproc_null, | |
1661 | }; | |
1662 | int err; | |
1663 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1664 | err = rpc_call_sync(clnt, &msg, flags); | |
1665 | put_rpccred(msg.rpc_cred); | |
1666 | return err; | |
1667 | } | |
188fef11 | 1668 | |
5e1550d6 TM |
1669 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1670 | { | |
1671 | struct rpc_message msg = { | |
1672 | .rpc_proc = &rpcproc_null, | |
1673 | .rpc_cred = cred, | |
1674 | }; | |
84115e1c TM |
1675 | struct rpc_task_setup task_setup_data = { |
1676 | .rpc_client = clnt, | |
1677 | .rpc_message = &msg, | |
1678 | .callback_ops = &rpc_default_ops, | |
1679 | .flags = flags, | |
1680 | }; | |
c970aa85 | 1681 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 1682 | } |
e8914c65 | 1683 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 1684 | |
188fef11 | 1685 | #ifdef RPC_DEBUG |
68a23ee9 CL |
1686 | static void rpc_show_header(void) |
1687 | { | |
cb3997b5 CL |
1688 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
1689 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
1690 | } |
1691 | ||
38e886e0 CL |
1692 | static void rpc_show_task(const struct rpc_clnt *clnt, |
1693 | const struct rpc_task *task) | |
1694 | { | |
1695 | const char *rpc_waitq = "none"; | |
cb3997b5 | 1696 | char *p, action[KSYM_SYMBOL_LEN]; |
38e886e0 CL |
1697 | |
1698 | if (RPC_IS_QUEUED(task)) | |
1699 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
1700 | ||
cb3997b5 CL |
1701 | /* map tk_action pointer to a function name; then trim off |
1702 | * the "+0x0 [sunrpc]" */ | |
1703 | sprint_symbol(action, (unsigned long)task->tk_action); | |
1704 | p = strchr(action, '+'); | |
1705 | if (p) | |
1706 | *p = '\0'; | |
1707 | ||
1708 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n", | |
1709 | task->tk_pid, task->tk_flags, task->tk_status, | |
1710 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
1711 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), | |
1712 | action, rpc_waitq); | |
38e886e0 CL |
1713 | } |
1714 | ||
188fef11 TM |
1715 | void rpc_show_tasks(void) |
1716 | { | |
1717 | struct rpc_clnt *clnt; | |
38e886e0 | 1718 | struct rpc_task *task; |
68a23ee9 | 1719 | int header = 0; |
188fef11 TM |
1720 | |
1721 | spin_lock(&rpc_client_lock); | |
188fef11 | 1722 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
188fef11 | 1723 | spin_lock(&clnt->cl_lock); |
38e886e0 | 1724 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
1725 | if (!header) { |
1726 | rpc_show_header(); | |
1727 | header++; | |
1728 | } | |
38e886e0 | 1729 | rpc_show_task(clnt, task); |
188fef11 TM |
1730 | } |
1731 | spin_unlock(&clnt->cl_lock); | |
1732 | } | |
188fef11 TM |
1733 | spin_unlock(&rpc_client_lock); |
1734 | } | |
1735 | #endif |