]>
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 | * | |
1da177e4 LT |
16 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
17 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> | |
18 | */ | |
19 | ||
20 | #include <asm/system.h> | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/types.h> | |
cb3997b5 | 24 | #include <linux/kallsyms.h> |
1da177e4 | 25 | #include <linux/mm.h> |
23ac6581 TM |
26 | #include <linux/namei.h> |
27 | #include <linux/mount.h> | |
1da177e4 | 28 | #include <linux/slab.h> |
1da177e4 | 29 | #include <linux/utsname.h> |
11c556b3 | 30 | #include <linux/workqueue.h> |
176e21ee | 31 | #include <linux/in.h> |
510deb0d | 32 | #include <linux/in6.h> |
176e21ee | 33 | #include <linux/un.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); | |
caabea8a | 80 | static int rpc_ping(struct rpc_clnt *clnt); |
64c91a1f | 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; |
23ac6581 TM |
100 | struct nameidata nd; |
101 | struct path path; | |
102 | char name[15]; | |
103 | struct qstr q = { | |
104 | .name = name, | |
105 | }; | |
1da177e4 LT |
106 | int error; |
107 | ||
7d217cac TM |
108 | clnt->cl_path.mnt = ERR_PTR(-ENOENT); |
109 | clnt->cl_path.dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
110 | if (dir_name == NULL) |
111 | return 0; | |
54281548 | 112 | |
23ac6581 TM |
113 | path.mnt = rpc_get_mount(); |
114 | if (IS_ERR(path.mnt)) | |
115 | return PTR_ERR(path.mnt); | |
116 | error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd); | |
117 | if (error) | |
118 | goto err; | |
54281548 | 119 | |
f134585a | 120 | for (;;) { |
23ac6581 TM |
121 | q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
122 | name[sizeof(name) - 1] = '\0'; | |
123 | q.hash = full_name_hash(q.name, q.len); | |
124 | path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt); | |
125 | if (!IS_ERR(path.dentry)) | |
126 | break; | |
127 | error = PTR_ERR(path.dentry); | |
f134585a | 128 | if (error != -EEXIST) { |
23ac6581 TM |
129 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" |
130 | " %s/%s, error %d\n", | |
131 | dir_name, name, error); | |
132 | goto err_path_put; | |
f134585a | 133 | } |
1da177e4 | 134 | } |
23ac6581 TM |
135 | path_put(&nd.path); |
136 | clnt->cl_path = path; | |
137 | return 0; | |
138 | err_path_put: | |
139 | path_put(&nd.path); | |
140 | err: | |
141 | rpc_put_mount(); | |
142 | return error; | |
1da177e4 LT |
143 | } |
144 | ||
698b6d08 | 145 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 146 | { |
698b6d08 | 147 | struct rpc_program *program = args->program; |
1da177e4 LT |
148 | struct rpc_version *version; |
149 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 150 | struct rpc_auth *auth; |
1da177e4 | 151 | int err; |
06b8d255 CL |
152 | size_t len; |
153 | ||
154 | /* sanity check the name before trying to print it */ | |
155 | err = -EINVAL; | |
698b6d08 | 156 | len = strlen(args->servername); |
06b8d255 CL |
157 | if (len > RPC_MAXNETNAMELEN) |
158 | goto out_no_rpciod; | |
159 | len++; | |
1da177e4 | 160 | |
46121cf7 | 161 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 162 | program->name, args->servername, xprt); |
1da177e4 | 163 | |
4ada539e TM |
164 | err = rpciod_up(); |
165 | if (err) | |
166 | goto out_no_rpciod; | |
1da177e4 LT |
167 | err = -EINVAL; |
168 | if (!xprt) | |
712917d1 | 169 | goto out_no_xprt; |
698b6d08 TM |
170 | |
171 | if (args->version >= program->nrvers) | |
172 | goto out_err; | |
173 | version = program->version[args->version]; | |
174 | if (version == NULL) | |
1da177e4 LT |
175 | goto out_err; |
176 | ||
177 | err = -ENOMEM; | |
0da974f4 | 178 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
179 | if (!clnt) |
180 | goto out_err; | |
1da177e4 LT |
181 | clnt->cl_parent = clnt; |
182 | ||
183 | clnt->cl_server = clnt->cl_inline_name; | |
1da177e4 LT |
184 | if (len > sizeof(clnt->cl_inline_name)) { |
185 | char *buf = kmalloc(len, GFP_KERNEL); | |
698b6d08 | 186 | if (buf != NULL) |
1da177e4 LT |
187 | clnt->cl_server = buf; |
188 | else | |
189 | len = sizeof(clnt->cl_inline_name); | |
190 | } | |
698b6d08 | 191 | strlcpy(clnt->cl_server, args->servername, len); |
1da177e4 LT |
192 | |
193 | clnt->cl_xprt = xprt; | |
194 | clnt->cl_procinfo = version->procs; | |
195 | clnt->cl_maxproc = version->nrprocs; | |
196 | clnt->cl_protname = program->name; | |
d5b337b4 | 197 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 198 | clnt->cl_vers = version->number; |
1da177e4 | 199 | clnt->cl_stats = program->stats; |
11c556b3 | 200 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
201 | err = -ENOMEM; |
202 | if (clnt->cl_metrics == NULL) | |
203 | goto out_no_stats; | |
3e32a5d9 | 204 | clnt->cl_program = program; |
6529eba0 | 205 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 206 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 207 | |
ec739ef0 | 208 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
209 | clnt->cl_autobind = 1; |
210 | ||
ba7392bb TM |
211 | clnt->cl_timeout = xprt->timeout; |
212 | if (args->timeout != NULL) { | |
213 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
214 | sizeof(clnt->cl_timeout_default)); | |
215 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
216 | } | |
217 | ||
1da177e4 | 218 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 219 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
608207e8 OK |
220 | clnt->cl_principal = NULL; |
221 | if (args->client_name) { | |
222 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); | |
223 | if (!clnt->cl_principal) | |
224 | goto out_no_principal; | |
225 | } | |
1da177e4 | 226 | |
006abe88 | 227 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 228 | |
1da177e4 LT |
229 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
230 | if (err < 0) | |
231 | goto out_no_path; | |
232 | ||
698b6d08 | 233 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 234 | if (IS_ERR(auth)) { |
1da177e4 | 235 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 236 | args->authflavor); |
6a19275a | 237 | err = PTR_ERR(auth); |
1da177e4 LT |
238 | goto out_no_auth; |
239 | } | |
240 | ||
241 | /* save the nodename */ | |
63ffc23d | 242 | clnt->cl_nodelen = strlen(init_utsname()->nodename); |
1da177e4 LT |
243 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
244 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
63ffc23d | 245 | memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen); |
6529eba0 | 246 | rpc_register_client(clnt); |
1da177e4 LT |
247 | return clnt; |
248 | ||
249 | out_no_auth: | |
7d217cac TM |
250 | if (!IS_ERR(clnt->cl_path.dentry)) { |
251 | rpc_remove_client_dir(clnt->cl_path.dentry); | |
54281548 TM |
252 | rpc_put_mount(); |
253 | } | |
1da177e4 | 254 | out_no_path: |
608207e8 OK |
255 | kfree(clnt->cl_principal); |
256 | out_no_principal: | |
23bf85ba TM |
257 | rpc_free_iostats(clnt->cl_metrics); |
258 | out_no_stats: | |
1da177e4 LT |
259 | if (clnt->cl_server != clnt->cl_inline_name) |
260 | kfree(clnt->cl_server); | |
261 | kfree(clnt); | |
262 | out_err: | |
6b6ca86b | 263 | xprt_put(xprt); |
712917d1 | 264 | out_no_xprt: |
4ada539e TM |
265 | rpciod_down(); |
266 | out_no_rpciod: | |
1da177e4 LT |
267 | return ERR_PTR(err); |
268 | } | |
269 | ||
c2866763 CL |
270 | /* |
271 | * rpc_create - create an RPC client and transport with one call | |
272 | * @args: rpc_clnt create argument structure | |
273 | * | |
274 | * Creates and initializes an RPC transport and an RPC client. | |
275 | * | |
276 | * It can ping the server in order to determine if it is up, and to see if | |
277 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
278 | * this behavior so asynchronous tasks can also use rpc_create. | |
279 | */ | |
280 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
281 | { | |
282 | struct rpc_xprt *xprt; | |
283 | struct rpc_clnt *clnt; | |
3c341b0b | 284 | struct xprt_create xprtargs = { |
9a23e332 | 285 | .net = args->net, |
4fa016eb | 286 | .ident = args->protocol, |
d3bc9a1d | 287 | .srcaddr = args->saddress, |
96802a09 FM |
288 | .dstaddr = args->address, |
289 | .addrlen = args->addrsize, | |
f300baba | 290 | .bc_xprt = args->bc_xprt, |
96802a09 | 291 | }; |
510deb0d | 292 | char servername[48]; |
c2866763 | 293 | |
43780b87 CL |
294 | /* |
295 | * If the caller chooses not to specify a hostname, whip | |
296 | * up a string representation of the passed-in address. | |
297 | */ | |
298 | if (args->servername == NULL) { | |
176e21ee CL |
299 | struct sockaddr_un *sun = |
300 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
301 | struct sockaddr_in *sin = |
302 | (struct sockaddr_in *)args->address; | |
303 | struct sockaddr_in6 *sin6 = | |
304 | (struct sockaddr_in6 *)args->address; | |
305 | ||
510deb0d CL |
306 | servername[0] = '\0'; |
307 | switch (args->address->sa_family) { | |
176e21ee CL |
308 | case AF_LOCAL: |
309 | snprintf(servername, sizeof(servername), "%s", | |
310 | sun->sun_path); | |
311 | break; | |
da09eb93 | 312 | case AF_INET: |
21454aaa HH |
313 | snprintf(servername, sizeof(servername), "%pI4", |
314 | &sin->sin_addr.s_addr); | |
510deb0d | 315 | break; |
da09eb93 | 316 | case AF_INET6: |
5b095d98 | 317 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 318 | &sin6->sin6_addr); |
510deb0d | 319 | break; |
510deb0d CL |
320 | default: |
321 | /* caller wants default server name, but | |
322 | * address family isn't recognized. */ | |
323 | return ERR_PTR(-EINVAL); | |
324 | } | |
43780b87 CL |
325 | args->servername = servername; |
326 | } | |
327 | ||
510deb0d CL |
328 | xprt = xprt_create_transport(&xprtargs); |
329 | if (IS_ERR(xprt)) | |
330 | return (struct rpc_clnt *)xprt; | |
331 | ||
c2866763 CL |
332 | /* |
333 | * By default, kernel RPC client connects from a reserved port. | |
334 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
335 | * but it is always enabled for rpciod, which handles the connect | |
336 | * operation. | |
337 | */ | |
338 | xprt->resvport = 1; | |
339 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
340 | xprt->resvport = 0; | |
341 | ||
698b6d08 | 342 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
343 | if (IS_ERR(clnt)) |
344 | return clnt; | |
345 | ||
346 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
caabea8a | 347 | int err = rpc_ping(clnt); |
c2866763 CL |
348 | if (err != 0) { |
349 | rpc_shutdown_client(clnt); | |
350 | return ERR_PTR(err); | |
351 | } | |
352 | } | |
353 | ||
354 | clnt->cl_softrtry = 1; | |
355 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
356 | clnt->cl_softrtry = 0; | |
357 | ||
c2866763 CL |
358 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
359 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
360 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
361 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
362 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
363 | clnt->cl_chatty = 1; | |
c2866763 CL |
364 | |
365 | return clnt; | |
366 | } | |
b86acd50 | 367 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 368 | |
1da177e4 LT |
369 | /* |
370 | * This function clones the RPC client structure. It allows us to share the | |
371 | * same transport while varying parameters such as the authentication | |
372 | * flavour. | |
373 | */ | |
374 | struct rpc_clnt * | |
375 | rpc_clone_client(struct rpc_clnt *clnt) | |
376 | { | |
377 | struct rpc_clnt *new; | |
3e32a5d9 | 378 | int err = -ENOMEM; |
1da177e4 | 379 | |
e69062b4 | 380 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
381 | if (!new) |
382 | goto out_no_clnt; | |
d431a555 TM |
383 | new->cl_parent = clnt; |
384 | /* Turn off autobind on clones */ | |
385 | new->cl_autobind = 0; | |
386 | INIT_LIST_HEAD(&new->cl_tasks); | |
387 | spin_lock_init(&new->cl_lock); | |
ba7392bb | 388 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
23bf85ba TM |
389 | new->cl_metrics = rpc_alloc_iostats(clnt); |
390 | if (new->cl_metrics == NULL) | |
391 | goto out_no_stats; | |
608207e8 OK |
392 | if (clnt->cl_principal) { |
393 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); | |
394 | if (new->cl_principal == NULL) | |
395 | goto out_no_principal; | |
396 | } | |
006abe88 | 397 | atomic_set(&new->cl_count, 1); |
3e32a5d9 TM |
398 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
399 | if (err != 0) | |
400 | goto out_no_path; | |
1da177e4 LT |
401 | if (new->cl_auth) |
402 | atomic_inc(&new->cl_auth->au_count); | |
d431a555 | 403 | xprt_get(clnt->cl_xprt); |
006abe88 | 404 | atomic_inc(&clnt->cl_count); |
6529eba0 | 405 | rpc_register_client(new); |
4ada539e | 406 | rpciod_up(); |
1da177e4 | 407 | return new; |
3e32a5d9 | 408 | out_no_path: |
608207e8 OK |
409 | kfree(new->cl_principal); |
410 | out_no_principal: | |
3e32a5d9 | 411 | rpc_free_iostats(new->cl_metrics); |
23bf85ba TM |
412 | out_no_stats: |
413 | kfree(new); | |
1da177e4 | 414 | out_no_clnt: |
0dc47877 | 415 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 416 | return ERR_PTR(err); |
1da177e4 | 417 | } |
e8914c65 | 418 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 419 | |
58f9612c TM |
420 | /* |
421 | * Kill all tasks for the given client. | |
422 | * XXX: kill their descendants as well? | |
423 | */ | |
424 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
425 | { | |
426 | struct rpc_task *rovr; | |
427 | ||
428 | ||
429 | if (list_empty(&clnt->cl_tasks)) | |
430 | return; | |
431 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
432 | /* | |
433 | * Spin lock all_tasks to prevent changes... | |
434 | */ | |
435 | spin_lock(&clnt->cl_lock); | |
436 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
437 | if (!RPC_IS_ACTIVATED(rovr)) | |
438 | continue; | |
439 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
440 | rovr->tk_flags |= RPC_TASK_KILLED; | |
441 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
442 | if (RPC_IS_QUEUED(rovr)) |
443 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
444 | rovr); | |
58f9612c TM |
445 | } |
446 | } | |
447 | spin_unlock(&clnt->cl_lock); | |
448 | } | |
449 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
450 | ||
1da177e4 LT |
451 | /* |
452 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 453 | * requests. |
1da177e4 | 454 | */ |
4c402b40 | 455 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 456 | { |
34f52e35 TM |
457 | dprintk("RPC: shutting down %s client for %s\n", |
458 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 | 459 | |
34f52e35 | 460 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 461 | rpc_killall_tasks(clnt); |
532347e2 | 462 | wait_event_timeout(destroy_wait, |
34f52e35 | 463 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
464 | } |
465 | ||
4c402b40 | 466 | rpc_release_client(clnt); |
1da177e4 | 467 | } |
e8914c65 | 468 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
469 | |
470 | /* | |
34f52e35 | 471 | * Free an RPC client |
1da177e4 | 472 | */ |
34f52e35 | 473 | static void |
006abe88 | 474 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 475 | { |
46121cf7 | 476 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 | 477 | clnt->cl_protname, clnt->cl_server); |
7d217cac TM |
478 | if (!IS_ERR(clnt->cl_path.dentry)) { |
479 | rpc_remove_client_dir(clnt->cl_path.dentry); | |
8f8e7a50 TM |
480 | rpc_put_mount(); |
481 | } | |
3e32a5d9 | 482 | if (clnt->cl_parent != clnt) { |
8ad7c892 | 483 | rpc_release_client(clnt->cl_parent); |
3e32a5d9 TM |
484 | goto out_free; |
485 | } | |
1da177e4 LT |
486 | if (clnt->cl_server != clnt->cl_inline_name) |
487 | kfree(clnt->cl_server); | |
488 | out_free: | |
6529eba0 | 489 | rpc_unregister_client(clnt); |
11c556b3 | 490 | rpc_free_iostats(clnt->cl_metrics); |
608207e8 | 491 | kfree(clnt->cl_principal); |
11c556b3 | 492 | clnt->cl_metrics = NULL; |
6b6ca86b | 493 | xprt_put(clnt->cl_xprt); |
4ada539e | 494 | rpciod_down(); |
1da177e4 | 495 | kfree(clnt); |
1da177e4 LT |
496 | } |
497 | ||
1dd17ec6 TM |
498 | /* |
499 | * Free an RPC client | |
500 | */ | |
501 | static void | |
006abe88 | 502 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 503 | { |
1dd17ec6 | 504 | if (clnt->cl_auth == NULL) { |
006abe88 | 505 | rpc_free_client(clnt); |
1dd17ec6 TM |
506 | return; |
507 | } | |
508 | ||
509 | /* | |
510 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
511 | * release remaining GSS contexts. This mechanism ensures | |
512 | * that it can do so safely. | |
513 | */ | |
006abe88 | 514 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
515 | rpcauth_release(clnt->cl_auth); |
516 | clnt->cl_auth = NULL; | |
006abe88 TM |
517 | if (atomic_dec_and_test(&clnt->cl_count)) |
518 | rpc_free_client(clnt); | |
1dd17ec6 TM |
519 | } |
520 | ||
1da177e4 | 521 | /* |
34f52e35 | 522 | * Release reference to the RPC client |
1da177e4 LT |
523 | */ |
524 | void | |
525 | rpc_release_client(struct rpc_clnt *clnt) | |
526 | { | |
34f52e35 | 527 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 528 | |
34f52e35 TM |
529 | if (list_empty(&clnt->cl_tasks)) |
530 | wake_up(&destroy_wait); | |
006abe88 TM |
531 | if (atomic_dec_and_test(&clnt->cl_count)) |
532 | rpc_free_auth(clnt); | |
34f52e35 TM |
533 | } |
534 | ||
007e251f AG |
535 | /** |
536 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
537 | * @old: old rpc_client |
538 | * @program: rpc program to set | |
539 | * @vers: rpc program version | |
007e251f AG |
540 | * |
541 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
542 | * of use for enabling different RPC programs to share the same transport. | |
543 | * The Sun NFSv2/v3 ACL protocol can do this. | |
544 | */ | |
545 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
546 | struct rpc_program *program, | |
89eb21c3 | 547 | u32 vers) |
007e251f AG |
548 | { |
549 | struct rpc_clnt *clnt; | |
550 | struct rpc_version *version; | |
551 | int err; | |
552 | ||
553 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
554 | version = program->version[vers]; | |
555 | clnt = rpc_clone_client(old); | |
556 | if (IS_ERR(clnt)) | |
557 | goto out; | |
558 | clnt->cl_procinfo = version->procs; | |
559 | clnt->cl_maxproc = version->nrprocs; | |
560 | clnt->cl_protname = program->name; | |
561 | clnt->cl_prog = program->number; | |
562 | clnt->cl_vers = version->number; | |
563 | clnt->cl_stats = program->stats; | |
caabea8a | 564 | err = rpc_ping(clnt); |
007e251f AG |
565 | if (err != 0) { |
566 | rpc_shutdown_client(clnt); | |
567 | clnt = ERR_PTR(err); | |
568 | } | |
cca5172a | 569 | out: |
007e251f AG |
570 | return clnt; |
571 | } | |
e8914c65 | 572 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 573 | |
58f9612c TM |
574 | void rpc_task_release_client(struct rpc_task *task) |
575 | { | |
576 | struct rpc_clnt *clnt = task->tk_client; | |
577 | ||
578 | if (clnt != NULL) { | |
579 | /* Remove from client task list */ | |
580 | spin_lock(&clnt->cl_lock); | |
581 | list_del(&task->tk_task); | |
582 | spin_unlock(&clnt->cl_lock); | |
583 | task->tk_client = NULL; | |
584 | ||
585 | rpc_release_client(clnt); | |
586 | } | |
587 | } | |
588 | ||
589 | static | |
590 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
591 | { | |
592 | if (clnt != NULL) { | |
593 | rpc_task_release_client(task); | |
594 | task->tk_client = clnt; | |
006abe88 | 595 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
596 | if (clnt->cl_softrtry) |
597 | task->tk_flags |= RPC_TASK_SOFT; | |
598 | /* Add to the client's list of all tasks */ | |
599 | spin_lock(&clnt->cl_lock); | |
600 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
601 | spin_unlock(&clnt->cl_lock); | |
602 | } | |
603 | } | |
604 | ||
cbdabc7f AA |
605 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
606 | { | |
607 | rpc_task_release_client(task); | |
608 | rpc_task_set_client(task, clnt); | |
609 | } | |
610 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
611 | ||
612 | ||
58f9612c TM |
613 | static void |
614 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
615 | { | |
616 | if (msg != NULL) { | |
617 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
618 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
619 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
620 | if (msg->rpc_cred != NULL) |
621 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
622 | } |
623 | } | |
624 | ||
1da177e4 LT |
625 | /* |
626 | * Default callback for async RPC calls | |
627 | */ | |
628 | static void | |
963d8fe5 | 629 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
630 | { |
631 | } | |
632 | ||
963d8fe5 TM |
633 | static const struct rpc_call_ops rpc_default_ops = { |
634 | .rpc_call_done = rpc_default_callback, | |
635 | }; | |
636 | ||
c970aa85 TM |
637 | /** |
638 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
639 | * @task_setup_data: pointer to task initialisation data | |
640 | */ | |
641 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 642 | { |
19445b99 | 643 | struct rpc_task *task; |
6e5b70e9 | 644 | |
84115e1c | 645 | task = rpc_new_task(task_setup_data); |
19445b99 | 646 | if (IS_ERR(task)) |
50859259 | 647 | goto out; |
6e5b70e9 | 648 | |
58f9612c TM |
649 | rpc_task_set_client(task, task_setup_data->rpc_client); |
650 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
651 | ||
58f9612c TM |
652 | if (task->tk_action == NULL) |
653 | rpc_call_start(task); | |
654 | ||
6e5b70e9 TM |
655 | atomic_inc(&task->tk_count); |
656 | rpc_execute(task); | |
6e5b70e9 | 657 | out: |
19445b99 | 658 | return task; |
6e5b70e9 | 659 | } |
c970aa85 | 660 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
661 | |
662 | /** | |
663 | * rpc_call_sync - Perform a synchronous RPC call | |
664 | * @clnt: pointer to RPC client | |
665 | * @msg: RPC call parameters | |
666 | * @flags: RPC call flags | |
1da177e4 | 667 | */ |
cbc20059 | 668 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
669 | { |
670 | struct rpc_task *task; | |
84115e1c TM |
671 | struct rpc_task_setup task_setup_data = { |
672 | .rpc_client = clnt, | |
673 | .rpc_message = msg, | |
674 | .callback_ops = &rpc_default_ops, | |
675 | .flags = flags, | |
676 | }; | |
6e5b70e9 | 677 | int status; |
1da177e4 | 678 | |
1da177e4 LT |
679 | BUG_ON(flags & RPC_TASK_ASYNC); |
680 | ||
c970aa85 | 681 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
682 | if (IS_ERR(task)) |
683 | return PTR_ERR(task); | |
e60859ac | 684 | status = task->tk_status; |
bde8f00c | 685 | rpc_put_task(task); |
1da177e4 LT |
686 | return status; |
687 | } | |
e8914c65 | 688 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 689 | |
6e5b70e9 TM |
690 | /** |
691 | * rpc_call_async - Perform an asynchronous RPC call | |
692 | * @clnt: pointer to RPC client | |
693 | * @msg: RPC call parameters | |
694 | * @flags: RPC call flags | |
65b6e42c | 695 | * @tk_ops: RPC call ops |
6e5b70e9 | 696 | * @data: user call data |
1da177e4 LT |
697 | */ |
698 | int | |
cbc20059 | 699 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 700 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
701 | { |
702 | struct rpc_task *task; | |
84115e1c TM |
703 | struct rpc_task_setup task_setup_data = { |
704 | .rpc_client = clnt, | |
705 | .rpc_message = msg, | |
706 | .callback_ops = tk_ops, | |
707 | .callback_data = data, | |
708 | .flags = flags|RPC_TASK_ASYNC, | |
709 | }; | |
1da177e4 | 710 | |
c970aa85 | 711 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
712 | if (IS_ERR(task)) |
713 | return PTR_ERR(task); | |
714 | rpc_put_task(task); | |
715 | return 0; | |
1da177e4 | 716 | } |
e8914c65 | 717 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 718 | |
55ae1aab RL |
719 | #if defined(CONFIG_NFS_V4_1) |
720 | /** | |
721 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
722 | * rpc_execute against it | |
7a73fdde JSR |
723 | * @req: RPC request |
724 | * @tk_ops: RPC call ops | |
55ae1aab RL |
725 | */ |
726 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 727 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
728 | { |
729 | struct rpc_task *task; | |
730 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
731 | struct rpc_task_setup task_setup_data = { | |
732 | .callback_ops = tk_ops, | |
733 | }; | |
734 | ||
735 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
736 | /* | |
737 | * Create an rpc_task to send the data | |
738 | */ | |
739 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 740 | if (IS_ERR(task)) { |
55ae1aab RL |
741 | xprt_free_bc_request(req); |
742 | goto out; | |
743 | } | |
744 | task->tk_rqstp = req; | |
745 | ||
746 | /* | |
747 | * Set up the xdr_buf length. | |
748 | * This also indicates that the buffer is XDR encoded already. | |
749 | */ | |
750 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
751 | xbufp->tail[0].iov_len; | |
752 | ||
753 | task->tk_action = call_bc_transmit; | |
754 | atomic_inc(&task->tk_count); | |
755 | BUG_ON(atomic_read(&task->tk_count) != 2); | |
756 | rpc_execute(task); | |
757 | ||
758 | out: | |
759 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
760 | return task; | |
761 | } | |
762 | #endif /* CONFIG_NFS_V4_1 */ | |
763 | ||
77de2c59 TM |
764 | void |
765 | rpc_call_start(struct rpc_task *task) | |
766 | { | |
767 | task->tk_action = call_start; | |
768 | } | |
769 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
770 | ||
ed39440a CL |
771 | /** |
772 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
773 | * @clnt: RPC client structure | |
774 | * @buf: target buffer | |
65b6e42c | 775 | * @bufsize: length of target buffer |
ed39440a CL |
776 | * |
777 | * Returns the number of bytes that are actually in the stored address. | |
778 | */ | |
779 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
780 | { | |
781 | size_t bytes; | |
782 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
783 | ||
784 | bytes = sizeof(xprt->addr); | |
785 | if (bytes > bufsize) | |
786 | bytes = bufsize; | |
787 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 788 | return xprt->addrlen; |
ed39440a | 789 | } |
b86acd50 | 790 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 791 | |
f425eba4 CL |
792 | /** |
793 | * rpc_peeraddr2str - return remote peer address in printable format | |
794 | * @clnt: RPC client structure | |
795 | * @format: address format | |
796 | * | |
797 | */ | |
b454ae90 CL |
798 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
799 | enum rpc_display_format_t format) | |
f425eba4 CL |
800 | { |
801 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
802 | |
803 | if (xprt->address_strings[format] != NULL) | |
804 | return xprt->address_strings[format]; | |
805 | else | |
806 | return "unprintable"; | |
f425eba4 | 807 | } |
b86acd50 | 808 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 809 | |
1da177e4 LT |
810 | void |
811 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
812 | { | |
813 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
814 | if (xprt->ops->set_buffer_size) |
815 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 | 816 | } |
e8914c65 | 817 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 LT |
818 | |
819 | /* | |
820 | * Return size of largest payload RPC client can support, in bytes | |
821 | * | |
822 | * For stream transports, this is one RPC record fragment (see RFC | |
823 | * 1831), as we don't support multi-record requests yet. For datagram | |
824 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
825 | * RPC header sizes. | |
826 | */ | |
827 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
828 | { | |
829 | return clnt->cl_xprt->max_payload; | |
830 | } | |
b86acd50 | 831 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 832 | |
35f5a422 CL |
833 | /** |
834 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
835 | * @clnt: client to rebind | |
836 | * | |
837 | */ | |
838 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
839 | { | |
840 | if (clnt->cl_autobind) | |
ec739ef0 | 841 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 842 | } |
b86acd50 | 843 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 844 | |
aae2006e AA |
845 | /* |
846 | * Restart an (async) RPC call from the call_prepare state. | |
847 | * Usually called from within the exit handler. | |
848 | */ | |
f1f88fc7 | 849 | int |
aae2006e AA |
850 | rpc_restart_call_prepare(struct rpc_task *task) |
851 | { | |
852 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 853 | return 0; |
aae2006e | 854 | task->tk_action = rpc_prepare_task; |
f1f88fc7 | 855 | return 1; |
aae2006e AA |
856 | } |
857 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
858 | ||
1da177e4 LT |
859 | /* |
860 | * Restart an (async) RPC call. Usually called from within the | |
861 | * exit handler. | |
862 | */ | |
f1f88fc7 | 863 | int |
1da177e4 LT |
864 | rpc_restart_call(struct rpc_task *task) |
865 | { | |
866 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 867 | return 0; |
1da177e4 | 868 | task->tk_action = call_start; |
f1f88fc7 | 869 | return 1; |
1da177e4 | 870 | } |
e8914c65 | 871 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 872 | |
3748f1e4 CL |
873 | #ifdef RPC_DEBUG |
874 | static const char *rpc_proc_name(const struct rpc_task *task) | |
875 | { | |
876 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
877 | ||
878 | if (proc) { | |
879 | if (proc->p_name) | |
880 | return proc->p_name; | |
881 | else | |
882 | return "NULL"; | |
883 | } else | |
884 | return "no proc"; | |
885 | } | |
886 | #endif | |
887 | ||
1da177e4 LT |
888 | /* |
889 | * 0. Initial state | |
890 | * | |
891 | * Other FSM states can be visited zero or more times, but | |
892 | * this state is visited exactly once for each RPC. | |
893 | */ | |
894 | static void | |
895 | call_start(struct rpc_task *task) | |
896 | { | |
897 | struct rpc_clnt *clnt = task->tk_client; | |
898 | ||
3748f1e4 | 899 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
46121cf7 | 900 | clnt->cl_protname, clnt->cl_vers, |
3748f1e4 | 901 | rpc_proc_name(task), |
46121cf7 | 902 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
903 | |
904 | /* Increment call count */ | |
905 | task->tk_msg.rpc_proc->p_count++; | |
906 | clnt->cl_stats->rpccnt++; | |
907 | task->tk_action = call_reserve; | |
908 | } | |
909 | ||
910 | /* | |
911 | * 1. Reserve an RPC call slot | |
912 | */ | |
913 | static void | |
914 | call_reserve(struct rpc_task *task) | |
915 | { | |
46121cf7 | 916 | dprint_status(task); |
1da177e4 | 917 | |
1da177e4 LT |
918 | task->tk_status = 0; |
919 | task->tk_action = call_reserveresult; | |
920 | xprt_reserve(task); | |
921 | } | |
922 | ||
923 | /* | |
924 | * 1b. Grok the result of xprt_reserve() | |
925 | */ | |
926 | static void | |
927 | call_reserveresult(struct rpc_task *task) | |
928 | { | |
929 | int status = task->tk_status; | |
930 | ||
46121cf7 | 931 | dprint_status(task); |
1da177e4 LT |
932 | |
933 | /* | |
934 | * After a call to xprt_reserve(), we must have either | |
935 | * a request slot or else an error status. | |
936 | */ | |
937 | task->tk_status = 0; | |
938 | if (status >= 0) { | |
939 | if (task->tk_rqstp) { | |
f2d47d02 | 940 | task->tk_action = call_refresh; |
1da177e4 LT |
941 | return; |
942 | } | |
943 | ||
944 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 945 | __func__, status); |
1da177e4 LT |
946 | rpc_exit(task, -EIO); |
947 | return; | |
948 | } | |
949 | ||
950 | /* | |
951 | * Even though there was an error, we may have acquired | |
952 | * a request slot somehow. Make sure not to leak it. | |
953 | */ | |
954 | if (task->tk_rqstp) { | |
955 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 956 | __func__, status); |
1da177e4 LT |
957 | xprt_release(task); |
958 | } | |
959 | ||
960 | switch (status) { | |
961 | case -EAGAIN: /* woken up; retry */ | |
962 | task->tk_action = call_reserve; | |
963 | return; | |
964 | case -EIO: /* probably a shutdown */ | |
965 | break; | |
966 | default: | |
967 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 968 | __func__, status); |
1da177e4 LT |
969 | break; |
970 | } | |
971 | rpc_exit(task, status); | |
972 | } | |
973 | ||
974 | /* | |
55576244 BF |
975 | * 2. Bind and/or refresh the credentials |
976 | */ | |
977 | static void | |
978 | call_refresh(struct rpc_task *task) | |
979 | { | |
980 | dprint_status(task); | |
981 | ||
982 | task->tk_action = call_refreshresult; | |
983 | task->tk_status = 0; | |
984 | task->tk_client->cl_stats->rpcauthrefresh++; | |
985 | rpcauth_refreshcred(task); | |
986 | } | |
987 | ||
988 | /* | |
989 | * 2a. Process the results of a credential refresh | |
990 | */ | |
991 | static void | |
992 | call_refreshresult(struct rpc_task *task) | |
993 | { | |
994 | int status = task->tk_status; | |
995 | ||
996 | dprint_status(task); | |
997 | ||
998 | task->tk_status = 0; | |
5fc43978 | 999 | task->tk_action = call_refresh; |
55576244 | 1000 | switch (status) { |
5fc43978 TM |
1001 | case 0: |
1002 | if (rpcauth_uptodatecred(task)) | |
1003 | task->tk_action = call_allocate; | |
55576244 BF |
1004 | return; |
1005 | case -ETIMEDOUT: | |
1006 | rpc_delay(task, 3*HZ); | |
5fc43978 TM |
1007 | case -EAGAIN: |
1008 | status = -EACCES; | |
1009 | if (!task->tk_cred_retry) | |
1010 | break; | |
1011 | task->tk_cred_retry--; | |
1012 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1013 | task->tk_pid, __func__); | |
1014 | return; | |
55576244 | 1015 | } |
5fc43978 TM |
1016 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1017 | task->tk_pid, __func__, status); | |
1018 | rpc_exit(task, status); | |
55576244 BF |
1019 | } |
1020 | ||
1021 | /* | |
1022 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1023 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1024 | */ |
1025 | static void | |
1026 | call_allocate(struct rpc_task *task) | |
1027 | { | |
f2d47d02 | 1028 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 CL |
1029 | struct rpc_rqst *req = task->tk_rqstp; |
1030 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 1031 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1032 | |
46121cf7 CL |
1033 | dprint_status(task); |
1034 | ||
2bea90d4 | 1035 | task->tk_status = 0; |
f2d47d02 | 1036 | task->tk_action = call_bind; |
2bea90d4 | 1037 | |
02107148 | 1038 | if (req->rq_buffer) |
1da177e4 LT |
1039 | return; |
1040 | ||
2bea90d4 CL |
1041 | if (proc->p_proc != 0) { |
1042 | BUG_ON(proc->p_arglen == 0); | |
1043 | if (proc->p_decode != NULL) | |
1044 | BUG_ON(proc->p_replen == 0); | |
1045 | } | |
1da177e4 | 1046 | |
2bea90d4 CL |
1047 | /* |
1048 | * Calculate the size (in quads) of the RPC call | |
1049 | * and reply headers, and convert both values | |
1050 | * to byte sizes. | |
1051 | */ | |
1052 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1053 | req->rq_callsize <<= 2; | |
1054 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1055 | req->rq_rcvsize <<= 2; | |
1056 | ||
c5a4dd8b CL |
1057 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1058 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1059 | if (req->rq_buffer != NULL) |
1da177e4 | 1060 | return; |
46121cf7 CL |
1061 | |
1062 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1063 | |
14b218a8 | 1064 | if (RPC_IS_ASYNC(task) || !signalled()) { |
b6e9c713 | 1065 | task->tk_action = call_allocate; |
1da177e4 LT |
1066 | rpc_delay(task, HZ>>4); |
1067 | return; | |
1068 | } | |
1069 | ||
1070 | rpc_exit(task, -ERESTARTSYS); | |
1071 | } | |
1072 | ||
940e3318 TM |
1073 | static inline int |
1074 | rpc_task_need_encode(struct rpc_task *task) | |
1075 | { | |
1076 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1077 | } | |
1078 | ||
1079 | static inline void | |
1080 | rpc_task_force_reencode(struct rpc_task *task) | |
1081 | { | |
1082 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1083 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1084 | } |
1085 | ||
2bea90d4 CL |
1086 | static inline void |
1087 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1088 | { | |
1089 | buf->head[0].iov_base = start; | |
1090 | buf->head[0].iov_len = len; | |
1091 | buf->tail[0].iov_len = 0; | |
1092 | buf->page_len = 0; | |
4f22ccc3 | 1093 | buf->flags = 0; |
2bea90d4 CL |
1094 | buf->len = 0; |
1095 | buf->buflen = len; | |
1096 | } | |
1097 | ||
1da177e4 LT |
1098 | /* |
1099 | * 3. Encode arguments of an RPC call | |
1100 | */ | |
1101 | static void | |
b0e1c57e | 1102 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1103 | { |
1da177e4 | 1104 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1105 | kxdreproc_t encode; |
d8ed029d | 1106 | __be32 *p; |
1da177e4 | 1107 | |
46121cf7 | 1108 | dprint_status(task); |
1da177e4 | 1109 | |
2bea90d4 CL |
1110 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1111 | req->rq_buffer, | |
1112 | req->rq_callsize); | |
1113 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1114 | (char *)req->rq_buffer + req->rq_callsize, | |
1115 | req->rq_rcvsize); | |
1da177e4 | 1116 | |
b0e1c57e CL |
1117 | p = rpc_encode_header(task); |
1118 | if (p == NULL) { | |
1119 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1120 | rpc_exit(task, -EIO); |
1121 | return; | |
1122 | } | |
b0e1c57e CL |
1123 | |
1124 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1125 | if (encode == NULL) |
1126 | return; | |
1127 | ||
1128 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1129 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | /* | |
1133 | * 4. Get the server port number if not yet set | |
1134 | */ | |
1135 | static void | |
1136 | call_bind(struct rpc_task *task) | |
1137 | { | |
ec739ef0 | 1138 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1139 | |
46121cf7 | 1140 | dprint_status(task); |
1da177e4 | 1141 | |
da351878 | 1142 | task->tk_action = call_connect; |
ec739ef0 | 1143 | if (!xprt_bound(xprt)) { |
da351878 | 1144 | task->tk_action = call_bind_status; |
ec739ef0 | 1145 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1146 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1147 | } |
1148 | } | |
1149 | ||
1150 | /* | |
da351878 CL |
1151 | * 4a. Sort out bind result |
1152 | */ | |
1153 | static void | |
1154 | call_bind_status(struct rpc_task *task) | |
1155 | { | |
906462af | 1156 | int status = -EIO; |
da351878 CL |
1157 | |
1158 | if (task->tk_status >= 0) { | |
46121cf7 | 1159 | dprint_status(task); |
da351878 CL |
1160 | task->tk_status = 0; |
1161 | task->tk_action = call_connect; | |
1162 | return; | |
1163 | } | |
1164 | ||
1165 | switch (task->tk_status) { | |
381ba74a TM |
1166 | case -ENOMEM: |
1167 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1168 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1169 | goto retry_timeout; |
da351878 | 1170 | case -EACCES: |
46121cf7 CL |
1171 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1172 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1173 | /* fail immediately if this is an RPC ping */ |
1174 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1175 | status = -EOPNOTSUPP; | |
1176 | break; | |
1177 | } | |
0b760113 TM |
1178 | if (task->tk_rebind_retry == 0) |
1179 | break; | |
1180 | task->tk_rebind_retry--; | |
ea635a51 | 1181 | rpc_delay(task, 3*HZ); |
da45828e | 1182 | goto retry_timeout; |
da351878 | 1183 | case -ETIMEDOUT: |
46121cf7 | 1184 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1185 | task->tk_pid); |
da45828e | 1186 | goto retry_timeout; |
da351878 | 1187 | case -EPFNOSUPPORT: |
906462af | 1188 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1189 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1190 | task->tk_pid); |
1191 | break; | |
1192 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1193 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1194 | task->tk_pid); |
00a6e7bb CL |
1195 | task->tk_status = 0; |
1196 | task->tk_action = call_bind; | |
1197 | return; | |
012da158 CL |
1198 | case -ECONNREFUSED: /* connection problems */ |
1199 | case -ECONNRESET: | |
1200 | case -ENOTCONN: | |
1201 | case -EHOSTDOWN: | |
1202 | case -EHOSTUNREACH: | |
1203 | case -ENETUNREACH: | |
1204 | case -EPIPE: | |
1205 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1206 | task->tk_pid, task->tk_status); | |
1207 | if (!RPC_IS_SOFTCONN(task)) { | |
1208 | rpc_delay(task, 5*HZ); | |
1209 | goto retry_timeout; | |
1210 | } | |
1211 | status = task->tk_status; | |
1212 | break; | |
da351878 | 1213 | default: |
46121cf7 | 1214 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1215 | task->tk_pid, -task->tk_status); |
da351878 CL |
1216 | } |
1217 | ||
1218 | rpc_exit(task, status); | |
1219 | return; | |
1220 | ||
da45828e TM |
1221 | retry_timeout: |
1222 | task->tk_action = call_timeout; | |
da351878 CL |
1223 | } |
1224 | ||
1225 | /* | |
1226 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1227 | */ |
1228 | static void | |
1229 | call_connect(struct rpc_task *task) | |
1230 | { | |
da351878 | 1231 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1232 | |
46121cf7 | 1233 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1234 | task->tk_pid, xprt, |
1235 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1236 | |
da351878 CL |
1237 | task->tk_action = call_transmit; |
1238 | if (!xprt_connected(xprt)) { | |
1239 | task->tk_action = call_connect_status; | |
1240 | if (task->tk_status < 0) | |
1241 | return; | |
1242 | xprt_connect(task); | |
1da177e4 | 1243 | } |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | /* | |
da351878 | 1247 | * 4c. Sort out connect result |
1da177e4 LT |
1248 | */ |
1249 | static void | |
1250 | call_connect_status(struct rpc_task *task) | |
1251 | { | |
1252 | struct rpc_clnt *clnt = task->tk_client; | |
1253 | int status = task->tk_status; | |
1254 | ||
46121cf7 | 1255 | dprint_status(task); |
da351878 | 1256 | |
1da177e4 | 1257 | task->tk_status = 0; |
2a491991 | 1258 | if (status >= 0 || status == -EAGAIN) { |
1da177e4 LT |
1259 | clnt->cl_stats->netreconn++; |
1260 | task->tk_action = call_transmit; | |
1261 | return; | |
1262 | } | |
1263 | ||
1da177e4 | 1264 | switch (status) { |
da45828e TM |
1265 | /* if soft mounted, test if we've timed out */ |
1266 | case -ETIMEDOUT: | |
1267 | task->tk_action = call_timeout; | |
2a491991 TM |
1268 | break; |
1269 | default: | |
1270 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1271 | } |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * 5. Transmit the RPC request, and wait for reply | |
1276 | */ | |
1277 | static void | |
1278 | call_transmit(struct rpc_task *task) | |
1279 | { | |
46121cf7 | 1280 | dprint_status(task); |
1da177e4 LT |
1281 | |
1282 | task->tk_action = call_status; | |
1283 | if (task->tk_status < 0) | |
1284 | return; | |
1285 | task->tk_status = xprt_prepare_transmit(task); | |
1286 | if (task->tk_status != 0) | |
1287 | return; | |
e0ab53de | 1288 | task->tk_action = call_transmit_status; |
1da177e4 | 1289 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1290 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1291 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
b0e1c57e | 1292 | rpc_xdr_encode(task); |
5e5ce5be | 1293 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1294 | if (task->tk_status != 0) { |
1295 | /* Was the error nonfatal? */ | |
1296 | if (task->tk_status == -EAGAIN) | |
1297 | rpc_delay(task, HZ >> 4); | |
1298 | else | |
1299 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1300 | return; |
8b39f2b4 | 1301 | } |
5e5ce5be | 1302 | } |
1da177e4 LT |
1303 | xprt_transmit(task); |
1304 | if (task->tk_status < 0) | |
1305 | return; | |
e0ab53de TM |
1306 | /* |
1307 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1308 | * in order to allow access to the socket to other RPC requests. | |
1309 | */ | |
1310 | call_transmit_status(task); | |
55ae1aab | 1311 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1312 | return; |
1313 | task->tk_action = rpc_exit_task; | |
fda13939 | 1314 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
e0ab53de TM |
1315 | } |
1316 | ||
1317 | /* | |
1318 | * 5a. Handle cleanup after a transmission | |
1319 | */ | |
1320 | static void | |
1321 | call_transmit_status(struct rpc_task *task) | |
1322 | { | |
1323 | task->tk_action = call_status; | |
206a134b CL |
1324 | |
1325 | /* | |
1326 | * Common case: success. Force the compiler to put this | |
1327 | * test first. | |
1328 | */ | |
1329 | if (task->tk_status == 0) { | |
1330 | xprt_end_transmit(task); | |
1331 | rpc_task_force_reencode(task); | |
1332 | return; | |
1333 | } | |
1334 | ||
15f081ca TM |
1335 | switch (task->tk_status) { |
1336 | case -EAGAIN: | |
1337 | break; | |
1338 | default: | |
206a134b | 1339 | dprint_status(task); |
15f081ca | 1340 | xprt_end_transmit(task); |
09a21c41 CL |
1341 | rpc_task_force_reencode(task); |
1342 | break; | |
15f081ca TM |
1343 | /* |
1344 | * Special cases: if we've been waiting on the | |
1345 | * socket's write_space() callback, or if the | |
1346 | * socket just returned a connection error, | |
1347 | * then hold onto the transport lock. | |
1348 | */ | |
1349 | case -ECONNREFUSED: | |
15f081ca TM |
1350 | case -EHOSTDOWN: |
1351 | case -EHOSTUNREACH: | |
1352 | case -ENETUNREACH: | |
09a21c41 CL |
1353 | if (RPC_IS_SOFTCONN(task)) { |
1354 | xprt_end_transmit(task); | |
1355 | rpc_exit(task, task->tk_status); | |
1356 | break; | |
1357 | } | |
1358 | case -ECONNRESET: | |
1359 | case -ENOTCONN: | |
c8485e4d | 1360 | case -EPIPE: |
15f081ca TM |
1361 | rpc_task_force_reencode(task); |
1362 | } | |
1da177e4 LT |
1363 | } |
1364 | ||
55ae1aab RL |
1365 | #if defined(CONFIG_NFS_V4_1) |
1366 | /* | |
1367 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1368 | * addition, disconnect on connectivity errors. | |
1369 | */ | |
1370 | static void | |
1371 | call_bc_transmit(struct rpc_task *task) | |
1372 | { | |
1373 | struct rpc_rqst *req = task->tk_rqstp; | |
1374 | ||
1375 | BUG_ON(task->tk_status != 0); | |
1376 | task->tk_status = xprt_prepare_transmit(task); | |
1377 | if (task->tk_status == -EAGAIN) { | |
1378 | /* | |
1379 | * Could not reserve the transport. Try again after the | |
1380 | * transport is released. | |
1381 | */ | |
1382 | task->tk_status = 0; | |
1383 | task->tk_action = call_bc_transmit; | |
1384 | return; | |
1385 | } | |
1386 | ||
1387 | task->tk_action = rpc_exit_task; | |
1388 | if (task->tk_status < 0) { | |
1389 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1390 | "error: %d\n", task->tk_status); | |
1391 | return; | |
1392 | } | |
1393 | ||
1394 | xprt_transmit(task); | |
1395 | xprt_end_transmit(task); | |
1396 | dprint_status(task); | |
1397 | switch (task->tk_status) { | |
1398 | case 0: | |
1399 | /* Success */ | |
1400 | break; | |
1401 | case -EHOSTDOWN: | |
1402 | case -EHOSTUNREACH: | |
1403 | case -ENETUNREACH: | |
1404 | case -ETIMEDOUT: | |
1405 | /* | |
1406 | * Problem reaching the server. Disconnect and let the | |
1407 | * forechannel reestablish the connection. The server will | |
1408 | * have to retransmit the backchannel request and we'll | |
1409 | * reprocess it. Since these ops are idempotent, there's no | |
1410 | * need to cache our reply at this time. | |
1411 | */ | |
1412 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1413 | "error: %d\n", task->tk_status); | |
1414 | xprt_conditional_disconnect(task->tk_xprt, | |
1415 | req->rq_connect_cookie); | |
1416 | break; | |
1417 | default: | |
1418 | /* | |
1419 | * We were unable to reply and will have to drop the | |
1420 | * request. The server should reconnect and retransmit. | |
1421 | */ | |
1422 | BUG_ON(task->tk_status == -EAGAIN); | |
1423 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1424 | "error: %d\n", task->tk_status); | |
1425 | break; | |
1426 | } | |
1427 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1428 | } | |
1429 | #endif /* CONFIG_NFS_V4_1 */ | |
1430 | ||
1da177e4 LT |
1431 | /* |
1432 | * 6. Sort out the RPC call status | |
1433 | */ | |
1434 | static void | |
1435 | call_status(struct rpc_task *task) | |
1436 | { | |
1437 | struct rpc_clnt *clnt = task->tk_client; | |
1438 | struct rpc_rqst *req = task->tk_rqstp; | |
1439 | int status; | |
1440 | ||
dd2b63d0 RL |
1441 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1442 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1443 | |
46121cf7 | 1444 | dprint_status(task); |
1da177e4 LT |
1445 | |
1446 | status = task->tk_status; | |
1447 | if (status >= 0) { | |
1448 | task->tk_action = call_decode; | |
1449 | return; | |
1450 | } | |
1451 | ||
1452 | task->tk_status = 0; | |
1453 | switch(status) { | |
76303992 TM |
1454 | case -EHOSTDOWN: |
1455 | case -EHOSTUNREACH: | |
1456 | case -ENETUNREACH: | |
1457 | /* | |
1458 | * Delay any retries for 3 seconds, then handle as if it | |
1459 | * were a timeout. | |
1460 | */ | |
1461 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1462 | case -ETIMEDOUT: |
1463 | task->tk_action = call_timeout; | |
241c39b9 | 1464 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1465 | xprt_conditional_disconnect(task->tk_xprt, |
1466 | req->rq_connect_cookie); | |
1da177e4 | 1467 | break; |
c8485e4d | 1468 | case -ECONNRESET: |
1da177e4 | 1469 | case -ECONNREFUSED: |
35f5a422 | 1470 | rpc_force_rebind(clnt); |
c8485e4d TM |
1471 | rpc_delay(task, 3*HZ); |
1472 | case -EPIPE: | |
1473 | case -ENOTCONN: | |
1da177e4 LT |
1474 | task->tk_action = call_bind; |
1475 | break; | |
1476 | case -EAGAIN: | |
1477 | task->tk_action = call_transmit; | |
1478 | break; | |
1479 | case -EIO: | |
1480 | /* shutdown or soft timeout */ | |
1481 | rpc_exit(task, status); | |
1482 | break; | |
1483 | default: | |
b6b6152c OK |
1484 | if (clnt->cl_chatty) |
1485 | printk("%s: RPC call returned error %d\n", | |
1da177e4 LT |
1486 | clnt->cl_protname, -status); |
1487 | rpc_exit(task, status); | |
1da177e4 LT |
1488 | } |
1489 | } | |
1490 | ||
1491 | /* | |
e0ab53de | 1492 | * 6a. Handle RPC timeout |
1da177e4 LT |
1493 | * We do not release the request slot, so we keep using the |
1494 | * same XID for all retransmits. | |
1495 | */ | |
1496 | static void | |
1497 | call_timeout(struct rpc_task *task) | |
1498 | { | |
1499 | struct rpc_clnt *clnt = task->tk_client; | |
1500 | ||
1501 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1502 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1503 | goto retry; |
1504 | } | |
1505 | ||
46121cf7 | 1506 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1507 | task->tk_timeouts++; |
1508 | ||
3a28becc CL |
1509 | if (RPC_IS_SOFTCONN(task)) { |
1510 | rpc_exit(task, -ETIMEDOUT); | |
1511 | return; | |
1512 | } | |
1da177e4 | 1513 | if (RPC_IS_SOFT(task)) { |
b6b6152c OK |
1514 | if (clnt->cl_chatty) |
1515 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", | |
1da177e4 | 1516 | clnt->cl_protname, clnt->cl_server); |
7494d00c TM |
1517 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
1518 | rpc_exit(task, -ETIMEDOUT); | |
1519 | else | |
1520 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1521 | return; |
1522 | } | |
1523 | ||
f518e35a | 1524 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1525 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
b6b6152c OK |
1526 | if (clnt->cl_chatty) |
1527 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1da177e4 LT |
1528 | clnt->cl_protname, clnt->cl_server); |
1529 | } | |
35f5a422 | 1530 | rpc_force_rebind(clnt); |
b48633bd TM |
1531 | /* |
1532 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1533 | * event? RFC2203 requires the server to drop all such requests. | |
1534 | */ | |
1535 | rpcauth_invalcred(task); | |
1da177e4 LT |
1536 | |
1537 | retry: | |
1538 | clnt->cl_stats->rpcretrans++; | |
1539 | task->tk_action = call_bind; | |
1540 | task->tk_status = 0; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * 7. Decode the RPC reply | |
1545 | */ | |
1546 | static void | |
1547 | call_decode(struct rpc_task *task) | |
1548 | { | |
1549 | struct rpc_clnt *clnt = task->tk_client; | |
1550 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 1551 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 1552 | __be32 *p; |
1da177e4 | 1553 | |
46121cf7 CL |
1554 | dprintk("RPC: %5u call_decode (status %d)\n", |
1555 | task->tk_pid, task->tk_status); | |
1da177e4 | 1556 | |
f518e35a | 1557 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
b6b6152c OK |
1558 | if (clnt->cl_chatty) |
1559 | printk(KERN_NOTICE "%s: server %s OK\n", | |
1560 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 LT |
1561 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1562 | } | |
1563 | ||
43ac3f29 TM |
1564 | /* |
1565 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 1566 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
1567 | */ |
1568 | smp_rmb(); | |
1da177e4 LT |
1569 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1570 | ||
1571 | /* Check that the softirq receive buffer is valid */ | |
1572 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1573 | sizeof(req->rq_rcv_buf)) != 0); | |
1574 | ||
1e799b67 TM |
1575 | if (req->rq_rcv_buf.len < 12) { |
1576 | if (!RPC_IS_SOFT(task)) { | |
1577 | task->tk_action = call_bind; | |
1578 | clnt->cl_stats->rpcretrans++; | |
1579 | goto out_retry; | |
1580 | } | |
1581 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
1582 | clnt->cl_protname, task->tk_status); | |
1583 | task->tk_action = call_timeout; | |
1584 | goto out_retry; | |
1585 | } | |
1586 | ||
b0e1c57e | 1587 | p = rpc_verify_header(task); |
abbcf28f TM |
1588 | if (IS_ERR(p)) { |
1589 | if (p == ERR_PTR(-EAGAIN)) | |
1590 | goto out_retry; | |
1591 | return; | |
1da177e4 LT |
1592 | } |
1593 | ||
abbcf28f | 1594 | task->tk_action = rpc_exit_task; |
1da177e4 | 1595 | |
6d5fcb5a | 1596 | if (decode) { |
1da177e4 LT |
1597 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1598 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1599 | } |
46121cf7 CL |
1600 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1601 | task->tk_status); | |
1da177e4 LT |
1602 | return; |
1603 | out_retry: | |
1da177e4 | 1604 | task->tk_status = 0; |
b0e1c57e | 1605 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 1606 | if (task->tk_rqstp == req) { |
dd2b63d0 | 1607 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 1608 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1609 | xprt_conditional_disconnect(task->tk_xprt, |
1610 | req->rq_connect_cookie); | |
24b74bf0 | 1611 | } |
1da177e4 LT |
1612 | } |
1613 | ||
d8ed029d | 1614 | static __be32 * |
b0e1c57e | 1615 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
1616 | { |
1617 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1618 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1619 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1620 | |
1621 | /* FIXME: check buffer size? */ | |
808012fb CL |
1622 | |
1623 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1624 | *p++ = req->rq_xid; /* XID */ |
1625 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1626 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1627 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1628 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1629 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1630 | p = rpcauth_marshcred(task, p); |
1631 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1632 | return p; | |
1da177e4 LT |
1633 | } |
1634 | ||
d8ed029d | 1635 | static __be32 * |
b0e1c57e | 1636 | rpc_verify_header(struct rpc_task *task) |
1da177e4 LT |
1637 | { |
1638 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1639 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1640 | __be32 *p = iov->iov_base; |
1641 | u32 n; | |
1da177e4 LT |
1642 | int error = -EACCES; |
1643 | ||
e8896495 DH |
1644 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1645 | /* RFC-1014 says that the representation of XDR data must be a | |
1646 | * multiple of four bytes | |
1647 | * - if it isn't pointer subtraction in the NFS client may give | |
1648 | * undefined results | |
1649 | */ | |
8a702bbb | 1650 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 1651 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 1652 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
1653 | goto out_eio; |
1654 | } | |
1da177e4 LT |
1655 | if ((len -= 3) < 0) |
1656 | goto out_overflow; | |
1da177e4 | 1657 | |
f4a2e418 | 1658 | p += 1; /* skip XID */ |
1da177e4 | 1659 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 1660 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 1661 | task->tk_pid, __func__, n); |
abbcf28f | 1662 | goto out_garbage; |
1da177e4 | 1663 | } |
f4a2e418 | 1664 | |
1da177e4 LT |
1665 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
1666 | if (--len < 0) | |
1667 | goto out_overflow; | |
1668 | switch ((n = ntohl(*p++))) { | |
1669 | case RPC_AUTH_ERROR: | |
1670 | break; | |
1671 | case RPC_MISMATCH: | |
46121cf7 CL |
1672 | dprintk("RPC: %5u %s: RPC call version " |
1673 | "mismatch!\n", | |
0dc47877 | 1674 | task->tk_pid, __func__); |
cdf47706 AG |
1675 | error = -EPROTONOSUPPORT; |
1676 | goto out_err; | |
1da177e4 | 1677 | default: |
46121cf7 CL |
1678 | dprintk("RPC: %5u %s: RPC call rejected, " |
1679 | "unknown error: %x\n", | |
0dc47877 | 1680 | task->tk_pid, __func__, n); |
1da177e4 LT |
1681 | goto out_eio; |
1682 | } | |
1683 | if (--len < 0) | |
1684 | goto out_overflow; | |
1685 | switch ((n = ntohl(*p++))) { | |
1686 | case RPC_AUTH_REJECTEDCRED: | |
1687 | case RPC_AUTH_REJECTEDVERF: | |
1688 | case RPCSEC_GSS_CREDPROBLEM: | |
1689 | case RPCSEC_GSS_CTXPROBLEM: | |
1690 | if (!task->tk_cred_retry) | |
1691 | break; | |
1692 | task->tk_cred_retry--; | |
46121cf7 | 1693 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 1694 | task->tk_pid, __func__); |
1da177e4 | 1695 | rpcauth_invalcred(task); |
220bcc2a TM |
1696 | /* Ensure we obtain a new XID! */ |
1697 | xprt_release(task); | |
118df3d1 | 1698 | task->tk_action = call_reserve; |
abbcf28f | 1699 | goto out_retry; |
1da177e4 LT |
1700 | case RPC_AUTH_BADCRED: |
1701 | case RPC_AUTH_BADVERF: | |
1702 | /* possibly garbled cred/verf? */ | |
1703 | if (!task->tk_garb_retry) | |
1704 | break; | |
1705 | task->tk_garb_retry--; | |
46121cf7 | 1706 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 1707 | task->tk_pid, __func__); |
1da177e4 | 1708 | task->tk_action = call_bind; |
abbcf28f | 1709 | goto out_retry; |
1da177e4 | 1710 | case RPC_AUTH_TOOWEAK: |
b0e1c57e | 1711 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
1356b8c2 | 1712 | "authentication.\n", task->tk_client->cl_server); |
1da177e4 LT |
1713 | break; |
1714 | default: | |
8a702bbb | 1715 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 1716 | task->tk_pid, __func__, n); |
1da177e4 LT |
1717 | error = -EIO; |
1718 | } | |
46121cf7 | 1719 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 1720 | task->tk_pid, __func__, n); |
1da177e4 LT |
1721 | goto out_err; |
1722 | } | |
1723 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 1724 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 1725 | task->tk_pid, __func__); |
abbcf28f | 1726 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1727 | } |
d8ed029d | 1728 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1729 | if (len < 0) |
1730 | goto out_overflow; | |
1731 | switch ((n = ntohl(*p++))) { | |
1732 | case RPC_SUCCESS: | |
1733 | return p; | |
1734 | case RPC_PROG_UNAVAIL: | |
46121cf7 | 1735 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
0dc47877 | 1736 | task->tk_pid, __func__, |
1da177e4 LT |
1737 | (unsigned int)task->tk_client->cl_prog, |
1738 | task->tk_client->cl_server); | |
cdf47706 AG |
1739 | error = -EPFNOSUPPORT; |
1740 | goto out_err; | |
1da177e4 | 1741 | case RPC_PROG_MISMATCH: |
46121cf7 | 1742 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
0dc47877 | 1743 | "server %s\n", task->tk_pid, __func__, |
1da177e4 LT |
1744 | (unsigned int)task->tk_client->cl_prog, |
1745 | (unsigned int)task->tk_client->cl_vers, | |
1746 | task->tk_client->cl_server); | |
cdf47706 AG |
1747 | error = -EPROTONOSUPPORT; |
1748 | goto out_err; | |
1da177e4 | 1749 | case RPC_PROC_UNAVAIL: |
3748f1e4 | 1750 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 1751 | "version %u on server %s\n", |
0dc47877 | 1752 | task->tk_pid, __func__, |
3748f1e4 | 1753 | rpc_proc_name(task), |
1da177e4 LT |
1754 | task->tk_client->cl_prog, |
1755 | task->tk_client->cl_vers, | |
1756 | task->tk_client->cl_server); | |
cdf47706 AG |
1757 | error = -EOPNOTSUPP; |
1758 | goto out_err; | |
1da177e4 | 1759 | case RPC_GARBAGE_ARGS: |
46121cf7 | 1760 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 1761 | task->tk_pid, __func__); |
1da177e4 LT |
1762 | break; /* retry */ |
1763 | default: | |
8a702bbb | 1764 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 1765 | task->tk_pid, __func__, n); |
1da177e4 LT |
1766 | /* Also retry */ |
1767 | } | |
1768 | ||
abbcf28f | 1769 | out_garbage: |
1da177e4 LT |
1770 | task->tk_client->cl_stats->rpcgarbage++; |
1771 | if (task->tk_garb_retry) { | |
1772 | task->tk_garb_retry--; | |
46121cf7 | 1773 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 1774 | task->tk_pid, __func__); |
1da177e4 | 1775 | task->tk_action = call_bind; |
abbcf28f TM |
1776 | out_retry: |
1777 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 1778 | } |
1da177e4 LT |
1779 | out_eio: |
1780 | error = -EIO; | |
1781 | out_err: | |
1782 | rpc_exit(task, error); | |
8a702bbb | 1783 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 1784 | __func__, error); |
abbcf28f | 1785 | return ERR_PTR(error); |
1da177e4 | 1786 | out_overflow: |
8a702bbb | 1787 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 1788 | __func__); |
abbcf28f | 1789 | goto out_garbage; |
1da177e4 | 1790 | } |
5ee0ed7d | 1791 | |
9f06c719 | 1792 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 1793 | { |
5ee0ed7d TM |
1794 | } |
1795 | ||
bf269551 | 1796 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
1797 | { |
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | static struct rpc_procinfo rpcproc_null = { | |
1802 | .p_encode = rpcproc_encode_null, | |
1803 | .p_decode = rpcproc_decode_null, | |
1804 | }; | |
1805 | ||
caabea8a | 1806 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
1807 | { |
1808 | struct rpc_message msg = { | |
1809 | .rpc_proc = &rpcproc_null, | |
1810 | }; | |
1811 | int err; | |
1812 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 1813 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
1814 | put_rpccred(msg.rpc_cred); |
1815 | return err; | |
1816 | } | |
188fef11 | 1817 | |
5e1550d6 TM |
1818 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1819 | { | |
1820 | struct rpc_message msg = { | |
1821 | .rpc_proc = &rpcproc_null, | |
1822 | .rpc_cred = cred, | |
1823 | }; | |
84115e1c TM |
1824 | struct rpc_task_setup task_setup_data = { |
1825 | .rpc_client = clnt, | |
1826 | .rpc_message = &msg, | |
1827 | .callback_ops = &rpc_default_ops, | |
1828 | .flags = flags, | |
1829 | }; | |
c970aa85 | 1830 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 1831 | } |
e8914c65 | 1832 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 1833 | |
188fef11 | 1834 | #ifdef RPC_DEBUG |
68a23ee9 CL |
1835 | static void rpc_show_header(void) |
1836 | { | |
cb3997b5 CL |
1837 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
1838 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
1839 | } |
1840 | ||
38e886e0 CL |
1841 | static void rpc_show_task(const struct rpc_clnt *clnt, |
1842 | const struct rpc_task *task) | |
1843 | { | |
1844 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
1845 | |
1846 | if (RPC_IS_QUEUED(task)) | |
1847 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
1848 | ||
b3bcedad | 1849 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
1850 | task->tk_pid, task->tk_flags, task->tk_status, |
1851 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
1852 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), | |
b3bcedad | 1853 | task->tk_action, rpc_waitq); |
38e886e0 CL |
1854 | } |
1855 | ||
188fef11 TM |
1856 | void rpc_show_tasks(void) |
1857 | { | |
1858 | struct rpc_clnt *clnt; | |
38e886e0 | 1859 | struct rpc_task *task; |
68a23ee9 | 1860 | int header = 0; |
188fef11 TM |
1861 | |
1862 | spin_lock(&rpc_client_lock); | |
188fef11 | 1863 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
188fef11 | 1864 | spin_lock(&clnt->cl_lock); |
38e886e0 | 1865 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
1866 | if (!header) { |
1867 | rpc_show_header(); | |
1868 | header++; | |
1869 | } | |
38e886e0 | 1870 | rpc_show_task(clnt, task); |
188fef11 TM |
1871 | } |
1872 | spin_unlock(&clnt->cl_lock); | |
1873 | } | |
188fef11 TM |
1874 | spin_unlock(&rpc_client_lock); |
1875 | } | |
1876 | #endif |