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 | 29 | #include <linux/mm.h> |
23ac6581 TM |
30 | #include <linux/namei.h> |
31 | #include <linux/mount.h> | |
1da177e4 | 32 | #include <linux/slab.h> |
1da177e4 | 33 | #include <linux/utsname.h> |
11c556b3 | 34 | #include <linux/workqueue.h> |
510deb0d | 35 | #include <linux/in6.h> |
1da177e4 LT |
36 | |
37 | #include <linux/sunrpc/clnt.h> | |
1da177e4 | 38 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 39 | #include <linux/sunrpc/metrics.h> |
55ae1aab | 40 | #include <linux/sunrpc/bc_xprt.h> |
1da177e4 | 41 | |
55ae1aab | 42 | #include "sunrpc.h" |
1da177e4 | 43 | |
1da177e4 LT |
44 | #ifdef RPC_DEBUG |
45 | # define RPCDBG_FACILITY RPCDBG_CALL | |
46 | #endif | |
47 | ||
46121cf7 CL |
48 | #define dprint_status(t) \ |
49 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 50 | __func__, t->tk_status) |
46121cf7 | 51 | |
188fef11 TM |
52 | /* |
53 | * All RPC clients are linked into this list | |
54 | */ | |
55 | static LIST_HEAD(all_clients); | |
56 | static DEFINE_SPINLOCK(rpc_client_lock); | |
57 | ||
1da177e4 LT |
58 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
59 | ||
60 | ||
61 | static void call_start(struct rpc_task *task); | |
62 | static void call_reserve(struct rpc_task *task); | |
63 | static void call_reserveresult(struct rpc_task *task); | |
64 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
65 | static void call_decode(struct rpc_task *task); |
66 | static void call_bind(struct rpc_task *task); | |
da351878 | 67 | static void call_bind_status(struct rpc_task *task); |
1da177e4 | 68 | static void call_transmit(struct rpc_task *task); |
55ae1aab RL |
69 | #if defined(CONFIG_NFS_V4_1) |
70 | static void call_bc_transmit(struct rpc_task *task); | |
71 | #endif /* CONFIG_NFS_V4_1 */ | |
1da177e4 | 72 | static void call_status(struct rpc_task *task); |
940e3318 | 73 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
74 | static void call_refresh(struct rpc_task *task); |
75 | static void call_refreshresult(struct rpc_task *task); | |
76 | static void call_timeout(struct rpc_task *task); | |
77 | static void call_connect(struct rpc_task *task); | |
78 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 79 | |
b0e1c57e CL |
80 | static __be32 *rpc_encode_header(struct rpc_task *task); |
81 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
caabea8a | 82 | static int rpc_ping(struct rpc_clnt *clnt); |
64c91a1f | 83 | |
188fef11 TM |
84 | static void rpc_register_client(struct rpc_clnt *clnt) |
85 | { | |
86 | spin_lock(&rpc_client_lock); | |
87 | list_add(&clnt->cl_clients, &all_clients); | |
88 | spin_unlock(&rpc_client_lock); | |
89 | } | |
90 | ||
91 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
92 | { | |
93 | spin_lock(&rpc_client_lock); | |
94 | list_del(&clnt->cl_clients); | |
95 | spin_unlock(&rpc_client_lock); | |
96 | } | |
1da177e4 LT |
97 | |
98 | static int | |
99 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
100 | { | |
f134585a | 101 | static uint32_t clntid; |
23ac6581 TM |
102 | struct nameidata nd; |
103 | struct path path; | |
104 | char name[15]; | |
105 | struct qstr q = { | |
106 | .name = name, | |
107 | }; | |
1da177e4 LT |
108 | int error; |
109 | ||
7d217cac TM |
110 | clnt->cl_path.mnt = ERR_PTR(-ENOENT); |
111 | clnt->cl_path.dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
112 | if (dir_name == NULL) |
113 | return 0; | |
54281548 | 114 | |
23ac6581 TM |
115 | path.mnt = rpc_get_mount(); |
116 | if (IS_ERR(path.mnt)) | |
117 | return PTR_ERR(path.mnt); | |
118 | error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd); | |
119 | if (error) | |
120 | goto err; | |
54281548 | 121 | |
f134585a | 122 | for (;;) { |
23ac6581 TM |
123 | q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
124 | name[sizeof(name) - 1] = '\0'; | |
125 | q.hash = full_name_hash(q.name, q.len); | |
126 | path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt); | |
127 | if (!IS_ERR(path.dentry)) | |
128 | break; | |
129 | error = PTR_ERR(path.dentry); | |
f134585a | 130 | if (error != -EEXIST) { |
23ac6581 TM |
131 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" |
132 | " %s/%s, error %d\n", | |
133 | dir_name, name, error); | |
134 | goto err_path_put; | |
f134585a | 135 | } |
1da177e4 | 136 | } |
23ac6581 TM |
137 | path_put(&nd.path); |
138 | clnt->cl_path = path; | |
139 | return 0; | |
140 | err_path_put: | |
141 | path_put(&nd.path); | |
142 | err: | |
143 | rpc_put_mount(); | |
144 | return error; | |
1da177e4 LT |
145 | } |
146 | ||
698b6d08 | 147 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 148 | { |
698b6d08 | 149 | struct rpc_program *program = args->program; |
1da177e4 LT |
150 | struct rpc_version *version; |
151 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 152 | struct rpc_auth *auth; |
1da177e4 | 153 | int err; |
06b8d255 CL |
154 | size_t len; |
155 | ||
156 | /* sanity check the name before trying to print it */ | |
157 | err = -EINVAL; | |
698b6d08 | 158 | len = strlen(args->servername); |
06b8d255 CL |
159 | if (len > RPC_MAXNETNAMELEN) |
160 | goto out_no_rpciod; | |
161 | len++; | |
1da177e4 | 162 | |
46121cf7 | 163 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 164 | program->name, args->servername, xprt); |
1da177e4 | 165 | |
4ada539e TM |
166 | err = rpciod_up(); |
167 | if (err) | |
168 | goto out_no_rpciod; | |
1da177e4 LT |
169 | err = -EINVAL; |
170 | if (!xprt) | |
712917d1 | 171 | goto out_no_xprt; |
698b6d08 TM |
172 | |
173 | if (args->version >= program->nrvers) | |
174 | goto out_err; | |
175 | version = program->version[args->version]; | |
176 | if (version == NULL) | |
1da177e4 LT |
177 | goto out_err; |
178 | ||
179 | err = -ENOMEM; | |
0da974f4 | 180 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
181 | if (!clnt) |
182 | goto out_err; | |
1da177e4 LT |
183 | clnt->cl_parent = clnt; |
184 | ||
185 | clnt->cl_server = clnt->cl_inline_name; | |
1da177e4 LT |
186 | if (len > sizeof(clnt->cl_inline_name)) { |
187 | char *buf = kmalloc(len, GFP_KERNEL); | |
698b6d08 | 188 | if (buf != NULL) |
1da177e4 LT |
189 | clnt->cl_server = buf; |
190 | else | |
191 | len = sizeof(clnt->cl_inline_name); | |
192 | } | |
698b6d08 | 193 | strlcpy(clnt->cl_server, args->servername, len); |
1da177e4 LT |
194 | |
195 | clnt->cl_xprt = xprt; | |
196 | clnt->cl_procinfo = version->procs; | |
197 | clnt->cl_maxproc = version->nrprocs; | |
198 | clnt->cl_protname = program->name; | |
d5b337b4 | 199 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 200 | clnt->cl_vers = version->number; |
1da177e4 | 201 | clnt->cl_stats = program->stats; |
11c556b3 | 202 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
203 | err = -ENOMEM; |
204 | if (clnt->cl_metrics == NULL) | |
205 | goto out_no_stats; | |
3e32a5d9 | 206 | clnt->cl_program = program; |
6529eba0 | 207 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 208 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 209 | |
ec739ef0 | 210 | if (!xprt_bound(clnt->cl_xprt)) |
1da177e4 LT |
211 | clnt->cl_autobind = 1; |
212 | ||
ba7392bb TM |
213 | clnt->cl_timeout = xprt->timeout; |
214 | if (args->timeout != NULL) { | |
215 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
216 | sizeof(clnt->cl_timeout_default)); | |
217 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
218 | } | |
219 | ||
1da177e4 | 220 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 221 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
608207e8 OK |
222 | clnt->cl_principal = NULL; |
223 | if (args->client_name) { | |
224 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); | |
225 | if (!clnt->cl_principal) | |
226 | goto out_no_principal; | |
227 | } | |
1da177e4 | 228 | |
006abe88 | 229 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 230 | |
1da177e4 LT |
231 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
232 | if (err < 0) | |
233 | goto out_no_path; | |
234 | ||
698b6d08 | 235 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 236 | if (IS_ERR(auth)) { |
1da177e4 | 237 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 238 | args->authflavor); |
6a19275a | 239 | err = PTR_ERR(auth); |
1da177e4 LT |
240 | goto out_no_auth; |
241 | } | |
242 | ||
243 | /* save the nodename */ | |
63ffc23d | 244 | clnt->cl_nodelen = strlen(init_utsname()->nodename); |
1da177e4 LT |
245 | if (clnt->cl_nodelen > UNX_MAXNODENAME) |
246 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
63ffc23d | 247 | memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen); |
6529eba0 | 248 | rpc_register_client(clnt); |
1da177e4 LT |
249 | return clnt; |
250 | ||
251 | out_no_auth: | |
7d217cac TM |
252 | if (!IS_ERR(clnt->cl_path.dentry)) { |
253 | rpc_remove_client_dir(clnt->cl_path.dentry); | |
54281548 TM |
254 | rpc_put_mount(); |
255 | } | |
1da177e4 | 256 | out_no_path: |
608207e8 OK |
257 | kfree(clnt->cl_principal); |
258 | out_no_principal: | |
23bf85ba TM |
259 | rpc_free_iostats(clnt->cl_metrics); |
260 | out_no_stats: | |
1da177e4 LT |
261 | if (clnt->cl_server != clnt->cl_inline_name) |
262 | kfree(clnt->cl_server); | |
263 | kfree(clnt); | |
264 | out_err: | |
6b6ca86b | 265 | xprt_put(xprt); |
712917d1 | 266 | out_no_xprt: |
4ada539e TM |
267 | rpciod_down(); |
268 | out_no_rpciod: | |
1da177e4 LT |
269 | return ERR_PTR(err); |
270 | } | |
271 | ||
c2866763 CL |
272 | /* |
273 | * rpc_create - create an RPC client and transport with one call | |
274 | * @args: rpc_clnt create argument structure | |
275 | * | |
276 | * Creates and initializes an RPC transport and an RPC client. | |
277 | * | |
278 | * It can ping the server in order to determine if it is up, and to see if | |
279 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
280 | * this behavior so asynchronous tasks can also use rpc_create. | |
281 | */ | |
282 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
283 | { | |
284 | struct rpc_xprt *xprt; | |
285 | struct rpc_clnt *clnt; | |
3c341b0b | 286 | struct xprt_create xprtargs = { |
4fa016eb | 287 | .ident = args->protocol, |
d3bc9a1d | 288 | .srcaddr = args->saddress, |
96802a09 FM |
289 | .dstaddr = args->address, |
290 | .addrlen = args->addrsize, | |
f300baba | 291 | .bc_xprt = args->bc_xprt, |
96802a09 | 292 | }; |
510deb0d | 293 | char servername[48]; |
c2866763 | 294 | |
43780b87 CL |
295 | /* |
296 | * If the caller chooses not to specify a hostname, whip | |
297 | * up a string representation of the passed-in address. | |
298 | */ | |
299 | if (args->servername == NULL) { | |
510deb0d CL |
300 | servername[0] = '\0'; |
301 | switch (args->address->sa_family) { | |
302 | case AF_INET: { | |
303 | struct sockaddr_in *sin = | |
304 | (struct sockaddr_in *)args->address; | |
21454aaa HH |
305 | snprintf(servername, sizeof(servername), "%pI4", |
306 | &sin->sin_addr.s_addr); | |
510deb0d CL |
307 | break; |
308 | } | |
309 | case AF_INET6: { | |
310 | struct sockaddr_in6 *sin = | |
311 | (struct sockaddr_in6 *)args->address; | |
5b095d98 | 312 | snprintf(servername, sizeof(servername), "%pI6", |
fdb46ee7 | 313 | &sin->sin6_addr); |
510deb0d CL |
314 | break; |
315 | } | |
316 | default: | |
317 | /* caller wants default server name, but | |
318 | * address family isn't recognized. */ | |
319 | return ERR_PTR(-EINVAL); | |
320 | } | |
43780b87 CL |
321 | args->servername = servername; |
322 | } | |
323 | ||
510deb0d CL |
324 | xprt = xprt_create_transport(&xprtargs); |
325 | if (IS_ERR(xprt)) | |
326 | return (struct rpc_clnt *)xprt; | |
327 | ||
c2866763 CL |
328 | /* |
329 | * By default, kernel RPC client connects from a reserved port. | |
330 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
331 | * but it is always enabled for rpciod, which handles the connect | |
332 | * operation. | |
333 | */ | |
334 | xprt->resvport = 1; | |
335 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
336 | xprt->resvport = 0; | |
337 | ||
698b6d08 | 338 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
339 | if (IS_ERR(clnt)) |
340 | return clnt; | |
341 | ||
342 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
caabea8a | 343 | int err = rpc_ping(clnt); |
c2866763 CL |
344 | if (err != 0) { |
345 | rpc_shutdown_client(clnt); | |
346 | return ERR_PTR(err); | |
347 | } | |
348 | } | |
349 | ||
350 | clnt->cl_softrtry = 1; | |
351 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
352 | clnt->cl_softrtry = 0; | |
353 | ||
c2866763 CL |
354 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
355 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
356 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
357 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
358 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
359 | clnt->cl_chatty = 1; | |
c2866763 CL |
360 | |
361 | return clnt; | |
362 | } | |
b86acd50 | 363 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 364 | |
1da177e4 LT |
365 | /* |
366 | * This function clones the RPC client structure. It allows us to share the | |
367 | * same transport while varying parameters such as the authentication | |
368 | * flavour. | |
369 | */ | |
370 | struct rpc_clnt * | |
371 | rpc_clone_client(struct rpc_clnt *clnt) | |
372 | { | |
373 | struct rpc_clnt *new; | |
3e32a5d9 | 374 | int err = -ENOMEM; |
1da177e4 | 375 | |
e69062b4 | 376 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
377 | if (!new) |
378 | goto out_no_clnt; | |
d431a555 TM |
379 | new->cl_parent = clnt; |
380 | /* Turn off autobind on clones */ | |
381 | new->cl_autobind = 0; | |
382 | INIT_LIST_HEAD(&new->cl_tasks); | |
383 | spin_lock_init(&new->cl_lock); | |
ba7392bb | 384 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
23bf85ba TM |
385 | new->cl_metrics = rpc_alloc_iostats(clnt); |
386 | if (new->cl_metrics == NULL) | |
387 | goto out_no_stats; | |
608207e8 OK |
388 | if (clnt->cl_principal) { |
389 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); | |
390 | if (new->cl_principal == NULL) | |
391 | goto out_no_principal; | |
392 | } | |
006abe88 | 393 | atomic_set(&new->cl_count, 1); |
3e32a5d9 TM |
394 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
395 | if (err != 0) | |
396 | goto out_no_path; | |
1da177e4 LT |
397 | if (new->cl_auth) |
398 | atomic_inc(&new->cl_auth->au_count); | |
d431a555 | 399 | xprt_get(clnt->cl_xprt); |
006abe88 | 400 | atomic_inc(&clnt->cl_count); |
6529eba0 | 401 | rpc_register_client(new); |
4ada539e | 402 | rpciod_up(); |
1da177e4 | 403 | return new; |
3e32a5d9 | 404 | out_no_path: |
608207e8 OK |
405 | kfree(new->cl_principal); |
406 | out_no_principal: | |
3e32a5d9 | 407 | rpc_free_iostats(new->cl_metrics); |
23bf85ba TM |
408 | out_no_stats: |
409 | kfree(new); | |
1da177e4 | 410 | out_no_clnt: |
0dc47877 | 411 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 412 | return ERR_PTR(err); |
1da177e4 | 413 | } |
e8914c65 | 414 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 415 | |
58f9612c TM |
416 | /* |
417 | * Kill all tasks for the given client. | |
418 | * XXX: kill their descendants as well? | |
419 | */ | |
420 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
421 | { | |
422 | struct rpc_task *rovr; | |
423 | ||
424 | ||
425 | if (list_empty(&clnt->cl_tasks)) | |
426 | return; | |
427 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
428 | /* | |
429 | * Spin lock all_tasks to prevent changes... | |
430 | */ | |
431 | spin_lock(&clnt->cl_lock); | |
432 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
433 | if (!RPC_IS_ACTIVATED(rovr)) | |
434 | continue; | |
435 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
436 | rovr->tk_flags |= RPC_TASK_KILLED; | |
437 | rpc_exit(rovr, -EIO); | |
438 | rpc_wake_up_queued_task(rovr->tk_waitqueue, rovr); | |
439 | } | |
440 | } | |
441 | spin_unlock(&clnt->cl_lock); | |
442 | } | |
443 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
444 | ||
1da177e4 LT |
445 | /* |
446 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 447 | * requests. |
1da177e4 | 448 | */ |
4c402b40 | 449 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 450 | { |
34f52e35 TM |
451 | dprintk("RPC: shutting down %s client for %s\n", |
452 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 | 453 | |
34f52e35 | 454 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 455 | rpc_killall_tasks(clnt); |
532347e2 | 456 | wait_event_timeout(destroy_wait, |
34f52e35 | 457 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
458 | } |
459 | ||
4c402b40 | 460 | rpc_release_client(clnt); |
1da177e4 | 461 | } |
e8914c65 | 462 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
463 | |
464 | /* | |
34f52e35 | 465 | * Free an RPC client |
1da177e4 | 466 | */ |
34f52e35 | 467 | static void |
006abe88 | 468 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 469 | { |
46121cf7 | 470 | dprintk("RPC: destroying %s client for %s\n", |
1da177e4 | 471 | clnt->cl_protname, clnt->cl_server); |
7d217cac TM |
472 | if (!IS_ERR(clnt->cl_path.dentry)) { |
473 | rpc_remove_client_dir(clnt->cl_path.dentry); | |
8f8e7a50 TM |
474 | rpc_put_mount(); |
475 | } | |
3e32a5d9 | 476 | if (clnt->cl_parent != clnt) { |
8ad7c892 | 477 | rpc_release_client(clnt->cl_parent); |
3e32a5d9 TM |
478 | goto out_free; |
479 | } | |
1da177e4 LT |
480 | if (clnt->cl_server != clnt->cl_inline_name) |
481 | kfree(clnt->cl_server); | |
482 | out_free: | |
6529eba0 | 483 | rpc_unregister_client(clnt); |
11c556b3 | 484 | rpc_free_iostats(clnt->cl_metrics); |
608207e8 | 485 | kfree(clnt->cl_principal); |
11c556b3 | 486 | clnt->cl_metrics = NULL; |
6b6ca86b | 487 | xprt_put(clnt->cl_xprt); |
4ada539e | 488 | rpciod_down(); |
1da177e4 | 489 | kfree(clnt); |
1da177e4 LT |
490 | } |
491 | ||
1dd17ec6 TM |
492 | /* |
493 | * Free an RPC client | |
494 | */ | |
495 | static void | |
006abe88 | 496 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 497 | { |
1dd17ec6 | 498 | if (clnt->cl_auth == NULL) { |
006abe88 | 499 | rpc_free_client(clnt); |
1dd17ec6 TM |
500 | return; |
501 | } | |
502 | ||
503 | /* | |
504 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
505 | * release remaining GSS contexts. This mechanism ensures | |
506 | * that it can do so safely. | |
507 | */ | |
006abe88 | 508 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
509 | rpcauth_release(clnt->cl_auth); |
510 | clnt->cl_auth = NULL; | |
006abe88 TM |
511 | if (atomic_dec_and_test(&clnt->cl_count)) |
512 | rpc_free_client(clnt); | |
1dd17ec6 TM |
513 | } |
514 | ||
1da177e4 | 515 | /* |
34f52e35 | 516 | * Release reference to the RPC client |
1da177e4 LT |
517 | */ |
518 | void | |
519 | rpc_release_client(struct rpc_clnt *clnt) | |
520 | { | |
34f52e35 | 521 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 522 | |
34f52e35 TM |
523 | if (list_empty(&clnt->cl_tasks)) |
524 | wake_up(&destroy_wait); | |
006abe88 TM |
525 | if (atomic_dec_and_test(&clnt->cl_count)) |
526 | rpc_free_auth(clnt); | |
34f52e35 TM |
527 | } |
528 | ||
007e251f AG |
529 | /** |
530 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
531 | * @old: old rpc_client |
532 | * @program: rpc program to set | |
533 | * @vers: rpc program version | |
007e251f AG |
534 | * |
535 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
536 | * of use for enabling different RPC programs to share the same transport. | |
537 | * The Sun NFSv2/v3 ACL protocol can do this. | |
538 | */ | |
539 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
540 | struct rpc_program *program, | |
89eb21c3 | 541 | u32 vers) |
007e251f AG |
542 | { |
543 | struct rpc_clnt *clnt; | |
544 | struct rpc_version *version; | |
545 | int err; | |
546 | ||
547 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
548 | version = program->version[vers]; | |
549 | clnt = rpc_clone_client(old); | |
550 | if (IS_ERR(clnt)) | |
551 | goto out; | |
552 | clnt->cl_procinfo = version->procs; | |
553 | clnt->cl_maxproc = version->nrprocs; | |
554 | clnt->cl_protname = program->name; | |
555 | clnt->cl_prog = program->number; | |
556 | clnt->cl_vers = version->number; | |
557 | clnt->cl_stats = program->stats; | |
caabea8a | 558 | err = rpc_ping(clnt); |
007e251f AG |
559 | if (err != 0) { |
560 | rpc_shutdown_client(clnt); | |
561 | clnt = ERR_PTR(err); | |
562 | } | |
cca5172a | 563 | out: |
007e251f AG |
564 | return clnt; |
565 | } | |
e8914c65 | 566 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 567 | |
58f9612c TM |
568 | void rpc_task_release_client(struct rpc_task *task) |
569 | { | |
570 | struct rpc_clnt *clnt = task->tk_client; | |
571 | ||
572 | if (clnt != NULL) { | |
573 | /* Remove from client task list */ | |
574 | spin_lock(&clnt->cl_lock); | |
575 | list_del(&task->tk_task); | |
576 | spin_unlock(&clnt->cl_lock); | |
577 | task->tk_client = NULL; | |
578 | ||
579 | rpc_release_client(clnt); | |
580 | } | |
581 | } | |
582 | ||
583 | static | |
584 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
585 | { | |
586 | if (clnt != NULL) { | |
587 | rpc_task_release_client(task); | |
588 | task->tk_client = clnt; | |
006abe88 | 589 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
590 | if (clnt->cl_softrtry) |
591 | task->tk_flags |= RPC_TASK_SOFT; | |
592 | /* Add to the client's list of all tasks */ | |
593 | spin_lock(&clnt->cl_lock); | |
594 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
595 | spin_unlock(&clnt->cl_lock); | |
596 | } | |
597 | } | |
598 | ||
599 | static void | |
600 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
601 | { | |
602 | if (msg != NULL) { | |
603 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
604 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
605 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
606 | if (msg->rpc_cred != NULL) |
607 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
608 | } |
609 | } | |
610 | ||
1da177e4 LT |
611 | /* |
612 | * Default callback for async RPC calls | |
613 | */ | |
614 | static void | |
963d8fe5 | 615 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
616 | { |
617 | } | |
618 | ||
963d8fe5 TM |
619 | static const struct rpc_call_ops rpc_default_ops = { |
620 | .rpc_call_done = rpc_default_callback, | |
621 | }; | |
622 | ||
c970aa85 TM |
623 | /** |
624 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
625 | * @task_setup_data: pointer to task initialisation data | |
626 | */ | |
627 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 628 | { |
19445b99 | 629 | struct rpc_task *task; |
6e5b70e9 | 630 | |
84115e1c | 631 | task = rpc_new_task(task_setup_data); |
19445b99 | 632 | if (IS_ERR(task)) |
50859259 | 633 | goto out; |
6e5b70e9 | 634 | |
58f9612c TM |
635 | rpc_task_set_client(task, task_setup_data->rpc_client); |
636 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
637 | ||
638 | if (task->tk_status != 0) { | |
639 | int ret = task->tk_status; | |
640 | rpc_put_task(task); | |
641 | return ERR_PTR(ret); | |
642 | } | |
643 | ||
644 | if (task->tk_action == NULL) | |
645 | rpc_call_start(task); | |
646 | ||
6e5b70e9 TM |
647 | atomic_inc(&task->tk_count); |
648 | rpc_execute(task); | |
6e5b70e9 | 649 | out: |
19445b99 | 650 | return task; |
6e5b70e9 | 651 | } |
c970aa85 | 652 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
653 | |
654 | /** | |
655 | * rpc_call_sync - Perform a synchronous RPC call | |
656 | * @clnt: pointer to RPC client | |
657 | * @msg: RPC call parameters | |
658 | * @flags: RPC call flags | |
1da177e4 | 659 | */ |
cbc20059 | 660 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
661 | { |
662 | struct rpc_task *task; | |
84115e1c TM |
663 | struct rpc_task_setup task_setup_data = { |
664 | .rpc_client = clnt, | |
665 | .rpc_message = msg, | |
666 | .callback_ops = &rpc_default_ops, | |
667 | .flags = flags, | |
668 | }; | |
6e5b70e9 | 669 | int status; |
1da177e4 | 670 | |
1da177e4 LT |
671 | BUG_ON(flags & RPC_TASK_ASYNC); |
672 | ||
c970aa85 | 673 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
674 | if (IS_ERR(task)) |
675 | return PTR_ERR(task); | |
e60859ac | 676 | status = task->tk_status; |
bde8f00c | 677 | rpc_put_task(task); |
1da177e4 LT |
678 | return status; |
679 | } | |
e8914c65 | 680 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 681 | |
6e5b70e9 TM |
682 | /** |
683 | * rpc_call_async - Perform an asynchronous RPC call | |
684 | * @clnt: pointer to RPC client | |
685 | * @msg: RPC call parameters | |
686 | * @flags: RPC call flags | |
65b6e42c | 687 | * @tk_ops: RPC call ops |
6e5b70e9 | 688 | * @data: user call data |
1da177e4 LT |
689 | */ |
690 | int | |
cbc20059 | 691 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 692 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
693 | { |
694 | struct rpc_task *task; | |
84115e1c TM |
695 | struct rpc_task_setup task_setup_data = { |
696 | .rpc_client = clnt, | |
697 | .rpc_message = msg, | |
698 | .callback_ops = tk_ops, | |
699 | .callback_data = data, | |
700 | .flags = flags|RPC_TASK_ASYNC, | |
701 | }; | |
1da177e4 | 702 | |
c970aa85 | 703 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
704 | if (IS_ERR(task)) |
705 | return PTR_ERR(task); | |
706 | rpc_put_task(task); | |
707 | return 0; | |
1da177e4 | 708 | } |
e8914c65 | 709 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 710 | |
55ae1aab RL |
711 | #if defined(CONFIG_NFS_V4_1) |
712 | /** | |
713 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
714 | * rpc_execute against it | |
7a73fdde JSR |
715 | * @req: RPC request |
716 | * @tk_ops: RPC call ops | |
55ae1aab RL |
717 | */ |
718 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 719 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
720 | { |
721 | struct rpc_task *task; | |
722 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
723 | struct rpc_task_setup task_setup_data = { | |
724 | .callback_ops = tk_ops, | |
725 | }; | |
726 | ||
727 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
728 | /* | |
729 | * Create an rpc_task to send the data | |
730 | */ | |
731 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 732 | if (IS_ERR(task)) { |
55ae1aab RL |
733 | xprt_free_bc_request(req); |
734 | goto out; | |
735 | } | |
736 | task->tk_rqstp = req; | |
737 | ||
738 | /* | |
739 | * Set up the xdr_buf length. | |
740 | * This also indicates that the buffer is XDR encoded already. | |
741 | */ | |
742 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
743 | xbufp->tail[0].iov_len; | |
744 | ||
745 | task->tk_action = call_bc_transmit; | |
746 | atomic_inc(&task->tk_count); | |
747 | BUG_ON(atomic_read(&task->tk_count) != 2); | |
748 | rpc_execute(task); | |
749 | ||
750 | out: | |
751 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
752 | return task; | |
753 | } | |
754 | #endif /* CONFIG_NFS_V4_1 */ | |
755 | ||
77de2c59 TM |
756 | void |
757 | rpc_call_start(struct rpc_task *task) | |
758 | { | |
759 | task->tk_action = call_start; | |
760 | } | |
761 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
762 | ||
ed39440a CL |
763 | /** |
764 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
765 | * @clnt: RPC client structure | |
766 | * @buf: target buffer | |
65b6e42c | 767 | * @bufsize: length of target buffer |
ed39440a CL |
768 | * |
769 | * Returns the number of bytes that are actually in the stored address. | |
770 | */ | |
771 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
772 | { | |
773 | size_t bytes; | |
774 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
775 | ||
776 | bytes = sizeof(xprt->addr); | |
777 | if (bytes > bufsize) | |
778 | bytes = bufsize; | |
779 | memcpy(buf, &clnt->cl_xprt->addr, bytes); | |
c4efcb1d | 780 | return xprt->addrlen; |
ed39440a | 781 | } |
b86acd50 | 782 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 783 | |
f425eba4 CL |
784 | /** |
785 | * rpc_peeraddr2str - return remote peer address in printable format | |
786 | * @clnt: RPC client structure | |
787 | * @format: address format | |
788 | * | |
789 | */ | |
b454ae90 CL |
790 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
791 | enum rpc_display_format_t format) | |
f425eba4 CL |
792 | { |
793 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
7559c7a2 CL |
794 | |
795 | if (xprt->address_strings[format] != NULL) | |
796 | return xprt->address_strings[format]; | |
797 | else | |
798 | return "unprintable"; | |
f425eba4 | 799 | } |
b86acd50 | 800 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 801 | |
1da177e4 LT |
802 | void |
803 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
804 | { | |
805 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
806 | if (xprt->ops->set_buffer_size) |
807 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 | 808 | } |
e8914c65 | 809 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 LT |
810 | |
811 | /* | |
812 | * Return size of largest payload RPC client can support, in bytes | |
813 | * | |
814 | * For stream transports, this is one RPC record fragment (see RFC | |
815 | * 1831), as we don't support multi-record requests yet. For datagram | |
816 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
817 | * RPC header sizes. | |
818 | */ | |
819 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
820 | { | |
821 | return clnt->cl_xprt->max_payload; | |
822 | } | |
b86acd50 | 823 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 824 | |
35f5a422 CL |
825 | /** |
826 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
827 | * @clnt: client to rebind | |
828 | * | |
829 | */ | |
830 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
831 | { | |
832 | if (clnt->cl_autobind) | |
ec739ef0 | 833 | xprt_clear_bound(clnt->cl_xprt); |
35f5a422 | 834 | } |
b86acd50 | 835 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 836 | |
aae2006e AA |
837 | /* |
838 | * Restart an (async) RPC call from the call_prepare state. | |
839 | * Usually called from within the exit handler. | |
840 | */ | |
f1f88fc7 | 841 | int |
aae2006e AA |
842 | rpc_restart_call_prepare(struct rpc_task *task) |
843 | { | |
844 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 845 | return 0; |
aae2006e | 846 | task->tk_action = rpc_prepare_task; |
f1f88fc7 | 847 | return 1; |
aae2006e AA |
848 | } |
849 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
850 | ||
1da177e4 LT |
851 | /* |
852 | * Restart an (async) RPC call. Usually called from within the | |
853 | * exit handler. | |
854 | */ | |
f1f88fc7 | 855 | int |
1da177e4 LT |
856 | rpc_restart_call(struct rpc_task *task) |
857 | { | |
858 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 859 | return 0; |
1da177e4 | 860 | task->tk_action = call_start; |
f1f88fc7 | 861 | return 1; |
1da177e4 | 862 | } |
e8914c65 | 863 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 864 | |
3748f1e4 CL |
865 | #ifdef RPC_DEBUG |
866 | static const char *rpc_proc_name(const struct rpc_task *task) | |
867 | { | |
868 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
869 | ||
870 | if (proc) { | |
871 | if (proc->p_name) | |
872 | return proc->p_name; | |
873 | else | |
874 | return "NULL"; | |
875 | } else | |
876 | return "no proc"; | |
877 | } | |
878 | #endif | |
879 | ||
1da177e4 LT |
880 | /* |
881 | * 0. Initial state | |
882 | * | |
883 | * Other FSM states can be visited zero or more times, but | |
884 | * this state is visited exactly once for each RPC. | |
885 | */ | |
886 | static void | |
887 | call_start(struct rpc_task *task) | |
888 | { | |
889 | struct rpc_clnt *clnt = task->tk_client; | |
890 | ||
3748f1e4 | 891 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
46121cf7 | 892 | clnt->cl_protname, clnt->cl_vers, |
3748f1e4 | 893 | rpc_proc_name(task), |
46121cf7 | 894 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
895 | |
896 | /* Increment call count */ | |
897 | task->tk_msg.rpc_proc->p_count++; | |
898 | clnt->cl_stats->rpccnt++; | |
899 | task->tk_action = call_reserve; | |
900 | } | |
901 | ||
902 | /* | |
903 | * 1. Reserve an RPC call slot | |
904 | */ | |
905 | static void | |
906 | call_reserve(struct rpc_task *task) | |
907 | { | |
46121cf7 | 908 | dprint_status(task); |
1da177e4 | 909 | |
1da177e4 LT |
910 | task->tk_status = 0; |
911 | task->tk_action = call_reserveresult; | |
912 | xprt_reserve(task); | |
913 | } | |
914 | ||
915 | /* | |
916 | * 1b. Grok the result of xprt_reserve() | |
917 | */ | |
918 | static void | |
919 | call_reserveresult(struct rpc_task *task) | |
920 | { | |
921 | int status = task->tk_status; | |
922 | ||
46121cf7 | 923 | dprint_status(task); |
1da177e4 LT |
924 | |
925 | /* | |
926 | * After a call to xprt_reserve(), we must have either | |
927 | * a request slot or else an error status. | |
928 | */ | |
929 | task->tk_status = 0; | |
930 | if (status >= 0) { | |
931 | if (task->tk_rqstp) { | |
f2d47d02 | 932 | task->tk_action = call_refresh; |
1da177e4 LT |
933 | return; |
934 | } | |
935 | ||
936 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 937 | __func__, status); |
1da177e4 LT |
938 | rpc_exit(task, -EIO); |
939 | return; | |
940 | } | |
941 | ||
942 | /* | |
943 | * Even though there was an error, we may have acquired | |
944 | * a request slot somehow. Make sure not to leak it. | |
945 | */ | |
946 | if (task->tk_rqstp) { | |
947 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 948 | __func__, status); |
1da177e4 LT |
949 | xprt_release(task); |
950 | } | |
951 | ||
952 | switch (status) { | |
953 | case -EAGAIN: /* woken up; retry */ | |
954 | task->tk_action = call_reserve; | |
955 | return; | |
956 | case -EIO: /* probably a shutdown */ | |
957 | break; | |
958 | default: | |
959 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 960 | __func__, status); |
1da177e4 LT |
961 | break; |
962 | } | |
963 | rpc_exit(task, status); | |
964 | } | |
965 | ||
966 | /* | |
55576244 BF |
967 | * 2. Bind and/or refresh the credentials |
968 | */ | |
969 | static void | |
970 | call_refresh(struct rpc_task *task) | |
971 | { | |
972 | dprint_status(task); | |
973 | ||
974 | task->tk_action = call_refreshresult; | |
975 | task->tk_status = 0; | |
976 | task->tk_client->cl_stats->rpcauthrefresh++; | |
977 | rpcauth_refreshcred(task); | |
978 | } | |
979 | ||
980 | /* | |
981 | * 2a. Process the results of a credential refresh | |
982 | */ | |
983 | static void | |
984 | call_refreshresult(struct rpc_task *task) | |
985 | { | |
986 | int status = task->tk_status; | |
987 | ||
988 | dprint_status(task); | |
989 | ||
990 | task->tk_status = 0; | |
991 | task->tk_action = call_allocate; | |
992 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
993 | return; | |
994 | switch (status) { | |
995 | case -EACCES: | |
996 | rpc_exit(task, -EACCES); | |
997 | return; | |
998 | case -ENOMEM: | |
999 | rpc_exit(task, -ENOMEM); | |
1000 | return; | |
1001 | case -ETIMEDOUT: | |
1002 | rpc_delay(task, 3*HZ); | |
1003 | } | |
1004 | task->tk_action = call_refresh; | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1009 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1010 | */ |
1011 | static void | |
1012 | call_allocate(struct rpc_task *task) | |
1013 | { | |
f2d47d02 | 1014 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 CL |
1015 | struct rpc_rqst *req = task->tk_rqstp; |
1016 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 1017 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1018 | |
46121cf7 CL |
1019 | dprint_status(task); |
1020 | ||
2bea90d4 | 1021 | task->tk_status = 0; |
f2d47d02 | 1022 | task->tk_action = call_bind; |
2bea90d4 | 1023 | |
02107148 | 1024 | if (req->rq_buffer) |
1da177e4 LT |
1025 | return; |
1026 | ||
2bea90d4 CL |
1027 | if (proc->p_proc != 0) { |
1028 | BUG_ON(proc->p_arglen == 0); | |
1029 | if (proc->p_decode != NULL) | |
1030 | BUG_ON(proc->p_replen == 0); | |
1031 | } | |
1da177e4 | 1032 | |
2bea90d4 CL |
1033 | /* |
1034 | * Calculate the size (in quads) of the RPC call | |
1035 | * and reply headers, and convert both values | |
1036 | * to byte sizes. | |
1037 | */ | |
1038 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1039 | req->rq_callsize <<= 2; | |
1040 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1041 | req->rq_rcvsize <<= 2; | |
1042 | ||
c5a4dd8b CL |
1043 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1044 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1045 | if (req->rq_buffer != NULL) |
1da177e4 | 1046 | return; |
46121cf7 CL |
1047 | |
1048 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1049 | |
14b218a8 | 1050 | if (RPC_IS_ASYNC(task) || !signalled()) { |
b6e9c713 | 1051 | task->tk_action = call_allocate; |
1da177e4 LT |
1052 | rpc_delay(task, HZ>>4); |
1053 | return; | |
1054 | } | |
1055 | ||
1056 | rpc_exit(task, -ERESTARTSYS); | |
1057 | } | |
1058 | ||
940e3318 TM |
1059 | static inline int |
1060 | rpc_task_need_encode(struct rpc_task *task) | |
1061 | { | |
1062 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1063 | } | |
1064 | ||
1065 | static inline void | |
1066 | rpc_task_force_reencode(struct rpc_task *task) | |
1067 | { | |
1068 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1069 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1070 | } |
1071 | ||
2bea90d4 CL |
1072 | static inline void |
1073 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1074 | { | |
1075 | buf->head[0].iov_base = start; | |
1076 | buf->head[0].iov_len = len; | |
1077 | buf->tail[0].iov_len = 0; | |
1078 | buf->page_len = 0; | |
4f22ccc3 | 1079 | buf->flags = 0; |
2bea90d4 CL |
1080 | buf->len = 0; |
1081 | buf->buflen = len; | |
1082 | } | |
1083 | ||
1da177e4 LT |
1084 | /* |
1085 | * 3. Encode arguments of an RPC call | |
1086 | */ | |
1087 | static void | |
b0e1c57e | 1088 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1089 | { |
1da177e4 | 1090 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 1091 | kxdrproc_t encode; |
d8ed029d | 1092 | __be32 *p; |
1da177e4 | 1093 | |
46121cf7 | 1094 | dprint_status(task); |
1da177e4 | 1095 | |
2bea90d4 CL |
1096 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1097 | req->rq_buffer, | |
1098 | req->rq_callsize); | |
1099 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1100 | (char *)req->rq_buffer + req->rq_callsize, | |
1101 | req->rq_rcvsize); | |
1da177e4 | 1102 | |
b0e1c57e CL |
1103 | p = rpc_encode_header(task); |
1104 | if (p == NULL) { | |
1105 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1106 | rpc_exit(task, -EIO); |
1107 | return; | |
1108 | } | |
b0e1c57e CL |
1109 | |
1110 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1111 | if (encode == NULL) |
1112 | return; | |
1113 | ||
1114 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1115 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1116 | } |
1117 | ||
1118 | /* | |
1119 | * 4. Get the server port number if not yet set | |
1120 | */ | |
1121 | static void | |
1122 | call_bind(struct rpc_task *task) | |
1123 | { | |
ec739ef0 | 1124 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1125 | |
46121cf7 | 1126 | dprint_status(task); |
1da177e4 | 1127 | |
da351878 | 1128 | task->tk_action = call_connect; |
ec739ef0 | 1129 | if (!xprt_bound(xprt)) { |
da351878 | 1130 | task->tk_action = call_bind_status; |
ec739ef0 | 1131 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1132 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1133 | } |
1134 | } | |
1135 | ||
1136 | /* | |
da351878 CL |
1137 | * 4a. Sort out bind result |
1138 | */ | |
1139 | static void | |
1140 | call_bind_status(struct rpc_task *task) | |
1141 | { | |
906462af | 1142 | int status = -EIO; |
da351878 CL |
1143 | |
1144 | if (task->tk_status >= 0) { | |
46121cf7 | 1145 | dprint_status(task); |
da351878 CL |
1146 | task->tk_status = 0; |
1147 | task->tk_action = call_connect; | |
1148 | return; | |
1149 | } | |
1150 | ||
1151 | switch (task->tk_status) { | |
381ba74a TM |
1152 | case -ENOMEM: |
1153 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1154 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1155 | goto retry_timeout; |
da351878 | 1156 | case -EACCES: |
46121cf7 CL |
1157 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1158 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1159 | /* fail immediately if this is an RPC ping */ |
1160 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1161 | status = -EOPNOTSUPP; | |
1162 | break; | |
1163 | } | |
ea635a51 | 1164 | rpc_delay(task, 3*HZ); |
da45828e | 1165 | goto retry_timeout; |
da351878 | 1166 | case -ETIMEDOUT: |
46121cf7 | 1167 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1168 | task->tk_pid); |
da45828e | 1169 | goto retry_timeout; |
da351878 | 1170 | case -EPFNOSUPPORT: |
906462af | 1171 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1172 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1173 | task->tk_pid); |
1174 | break; | |
1175 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1176 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1177 | task->tk_pid); |
00a6e7bb CL |
1178 | task->tk_status = 0; |
1179 | task->tk_action = call_bind; | |
1180 | return; | |
012da158 CL |
1181 | case -ECONNREFUSED: /* connection problems */ |
1182 | case -ECONNRESET: | |
1183 | case -ENOTCONN: | |
1184 | case -EHOSTDOWN: | |
1185 | case -EHOSTUNREACH: | |
1186 | case -ENETUNREACH: | |
1187 | case -EPIPE: | |
1188 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1189 | task->tk_pid, task->tk_status); | |
1190 | if (!RPC_IS_SOFTCONN(task)) { | |
1191 | rpc_delay(task, 5*HZ); | |
1192 | goto retry_timeout; | |
1193 | } | |
1194 | status = task->tk_status; | |
1195 | break; | |
da351878 | 1196 | default: |
46121cf7 | 1197 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1198 | task->tk_pid, -task->tk_status); |
da351878 CL |
1199 | } |
1200 | ||
1201 | rpc_exit(task, status); | |
1202 | return; | |
1203 | ||
da45828e TM |
1204 | retry_timeout: |
1205 | task->tk_action = call_timeout; | |
da351878 CL |
1206 | } |
1207 | ||
1208 | /* | |
1209 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1210 | */ |
1211 | static void | |
1212 | call_connect(struct rpc_task *task) | |
1213 | { | |
da351878 | 1214 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1215 | |
46121cf7 | 1216 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1217 | task->tk_pid, xprt, |
1218 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1219 | |
da351878 CL |
1220 | task->tk_action = call_transmit; |
1221 | if (!xprt_connected(xprt)) { | |
1222 | task->tk_action = call_connect_status; | |
1223 | if (task->tk_status < 0) | |
1224 | return; | |
1225 | xprt_connect(task); | |
1da177e4 | 1226 | } |
1da177e4 LT |
1227 | } |
1228 | ||
1229 | /* | |
da351878 | 1230 | * 4c. Sort out connect result |
1da177e4 LT |
1231 | */ |
1232 | static void | |
1233 | call_connect_status(struct rpc_task *task) | |
1234 | { | |
1235 | struct rpc_clnt *clnt = task->tk_client; | |
1236 | int status = task->tk_status; | |
1237 | ||
46121cf7 | 1238 | dprint_status(task); |
da351878 | 1239 | |
1da177e4 | 1240 | task->tk_status = 0; |
2a491991 | 1241 | if (status >= 0 || status == -EAGAIN) { |
1da177e4 LT |
1242 | clnt->cl_stats->netreconn++; |
1243 | task->tk_action = call_transmit; | |
1244 | return; | |
1245 | } | |
1246 | ||
1da177e4 | 1247 | switch (status) { |
da45828e TM |
1248 | /* if soft mounted, test if we've timed out */ |
1249 | case -ETIMEDOUT: | |
1250 | task->tk_action = call_timeout; | |
2a491991 TM |
1251 | break; |
1252 | default: | |
1253 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1254 | } |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * 5. Transmit the RPC request, and wait for reply | |
1259 | */ | |
1260 | static void | |
1261 | call_transmit(struct rpc_task *task) | |
1262 | { | |
46121cf7 | 1263 | dprint_status(task); |
1da177e4 LT |
1264 | |
1265 | task->tk_action = call_status; | |
1266 | if (task->tk_status < 0) | |
1267 | return; | |
1268 | task->tk_status = xprt_prepare_transmit(task); | |
1269 | if (task->tk_status != 0) | |
1270 | return; | |
e0ab53de | 1271 | task->tk_action = call_transmit_status; |
1da177e4 | 1272 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1273 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1274 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
b0e1c57e | 1275 | rpc_xdr_encode(task); |
5e5ce5be | 1276 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1277 | if (task->tk_status != 0) { |
1278 | /* Was the error nonfatal? */ | |
1279 | if (task->tk_status == -EAGAIN) | |
1280 | rpc_delay(task, HZ >> 4); | |
1281 | else | |
1282 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1283 | return; |
8b39f2b4 | 1284 | } |
5e5ce5be | 1285 | } |
1da177e4 LT |
1286 | xprt_transmit(task); |
1287 | if (task->tk_status < 0) | |
1288 | return; | |
e0ab53de TM |
1289 | /* |
1290 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1291 | * in order to allow access to the socket to other RPC requests. | |
1292 | */ | |
1293 | call_transmit_status(task); | |
55ae1aab | 1294 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1295 | return; |
1296 | task->tk_action = rpc_exit_task; | |
fda13939 | 1297 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
e0ab53de TM |
1298 | } |
1299 | ||
1300 | /* | |
1301 | * 5a. Handle cleanup after a transmission | |
1302 | */ | |
1303 | static void | |
1304 | call_transmit_status(struct rpc_task *task) | |
1305 | { | |
1306 | task->tk_action = call_status; | |
206a134b CL |
1307 | |
1308 | /* | |
1309 | * Common case: success. Force the compiler to put this | |
1310 | * test first. | |
1311 | */ | |
1312 | if (task->tk_status == 0) { | |
1313 | xprt_end_transmit(task); | |
1314 | rpc_task_force_reencode(task); | |
1315 | return; | |
1316 | } | |
1317 | ||
15f081ca TM |
1318 | switch (task->tk_status) { |
1319 | case -EAGAIN: | |
1320 | break; | |
1321 | default: | |
206a134b | 1322 | dprint_status(task); |
15f081ca | 1323 | xprt_end_transmit(task); |
09a21c41 CL |
1324 | rpc_task_force_reencode(task); |
1325 | break; | |
15f081ca TM |
1326 | /* |
1327 | * Special cases: if we've been waiting on the | |
1328 | * socket's write_space() callback, or if the | |
1329 | * socket just returned a connection error, | |
1330 | * then hold onto the transport lock. | |
1331 | */ | |
1332 | case -ECONNREFUSED: | |
15f081ca TM |
1333 | case -EHOSTDOWN: |
1334 | case -EHOSTUNREACH: | |
1335 | case -ENETUNREACH: | |
09a21c41 CL |
1336 | if (RPC_IS_SOFTCONN(task)) { |
1337 | xprt_end_transmit(task); | |
1338 | rpc_exit(task, task->tk_status); | |
1339 | break; | |
1340 | } | |
1341 | case -ECONNRESET: | |
1342 | case -ENOTCONN: | |
c8485e4d | 1343 | case -EPIPE: |
15f081ca TM |
1344 | rpc_task_force_reencode(task); |
1345 | } | |
1da177e4 LT |
1346 | } |
1347 | ||
55ae1aab RL |
1348 | #if defined(CONFIG_NFS_V4_1) |
1349 | /* | |
1350 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1351 | * addition, disconnect on connectivity errors. | |
1352 | */ | |
1353 | static void | |
1354 | call_bc_transmit(struct rpc_task *task) | |
1355 | { | |
1356 | struct rpc_rqst *req = task->tk_rqstp; | |
1357 | ||
1358 | BUG_ON(task->tk_status != 0); | |
1359 | task->tk_status = xprt_prepare_transmit(task); | |
1360 | if (task->tk_status == -EAGAIN) { | |
1361 | /* | |
1362 | * Could not reserve the transport. Try again after the | |
1363 | * transport is released. | |
1364 | */ | |
1365 | task->tk_status = 0; | |
1366 | task->tk_action = call_bc_transmit; | |
1367 | return; | |
1368 | } | |
1369 | ||
1370 | task->tk_action = rpc_exit_task; | |
1371 | if (task->tk_status < 0) { | |
1372 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1373 | "error: %d\n", task->tk_status); | |
1374 | return; | |
1375 | } | |
1376 | ||
1377 | xprt_transmit(task); | |
1378 | xprt_end_transmit(task); | |
1379 | dprint_status(task); | |
1380 | switch (task->tk_status) { | |
1381 | case 0: | |
1382 | /* Success */ | |
1383 | break; | |
1384 | case -EHOSTDOWN: | |
1385 | case -EHOSTUNREACH: | |
1386 | case -ENETUNREACH: | |
1387 | case -ETIMEDOUT: | |
1388 | /* | |
1389 | * Problem reaching the server. Disconnect and let the | |
1390 | * forechannel reestablish the connection. The server will | |
1391 | * have to retransmit the backchannel request and we'll | |
1392 | * reprocess it. Since these ops are idempotent, there's no | |
1393 | * need to cache our reply at this time. | |
1394 | */ | |
1395 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1396 | "error: %d\n", task->tk_status); | |
1397 | xprt_conditional_disconnect(task->tk_xprt, | |
1398 | req->rq_connect_cookie); | |
1399 | break; | |
1400 | default: | |
1401 | /* | |
1402 | * We were unable to reply and will have to drop the | |
1403 | * request. The server should reconnect and retransmit. | |
1404 | */ | |
1405 | BUG_ON(task->tk_status == -EAGAIN); | |
1406 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1407 | "error: %d\n", task->tk_status); | |
1408 | break; | |
1409 | } | |
1410 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1411 | } | |
1412 | #endif /* CONFIG_NFS_V4_1 */ | |
1413 | ||
1da177e4 LT |
1414 | /* |
1415 | * 6. Sort out the RPC call status | |
1416 | */ | |
1417 | static void | |
1418 | call_status(struct rpc_task *task) | |
1419 | { | |
1420 | struct rpc_clnt *clnt = task->tk_client; | |
1421 | struct rpc_rqst *req = task->tk_rqstp; | |
1422 | int status; | |
1423 | ||
dd2b63d0 RL |
1424 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1425 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1426 | |
46121cf7 | 1427 | dprint_status(task); |
1da177e4 LT |
1428 | |
1429 | status = task->tk_status; | |
1430 | if (status >= 0) { | |
1431 | task->tk_action = call_decode; | |
1432 | return; | |
1433 | } | |
1434 | ||
1435 | task->tk_status = 0; | |
1436 | switch(status) { | |
76303992 TM |
1437 | case -EHOSTDOWN: |
1438 | case -EHOSTUNREACH: | |
1439 | case -ENETUNREACH: | |
1440 | /* | |
1441 | * Delay any retries for 3 seconds, then handle as if it | |
1442 | * were a timeout. | |
1443 | */ | |
1444 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1445 | case -ETIMEDOUT: |
1446 | task->tk_action = call_timeout; | |
241c39b9 | 1447 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1448 | xprt_conditional_disconnect(task->tk_xprt, |
1449 | req->rq_connect_cookie); | |
1da177e4 | 1450 | break; |
c8485e4d | 1451 | case -ECONNRESET: |
1da177e4 | 1452 | case -ECONNREFUSED: |
35f5a422 | 1453 | rpc_force_rebind(clnt); |
c8485e4d TM |
1454 | rpc_delay(task, 3*HZ); |
1455 | case -EPIPE: | |
1456 | case -ENOTCONN: | |
1da177e4 LT |
1457 | task->tk_action = call_bind; |
1458 | break; | |
1459 | case -EAGAIN: | |
1460 | task->tk_action = call_transmit; | |
1461 | break; | |
1462 | case -EIO: | |
1463 | /* shutdown or soft timeout */ | |
1464 | rpc_exit(task, status); | |
1465 | break; | |
1466 | default: | |
b6b6152c OK |
1467 | if (clnt->cl_chatty) |
1468 | printk("%s: RPC call returned error %d\n", | |
1da177e4 LT |
1469 | clnt->cl_protname, -status); |
1470 | rpc_exit(task, status); | |
1da177e4 LT |
1471 | } |
1472 | } | |
1473 | ||
1474 | /* | |
e0ab53de | 1475 | * 6a. Handle RPC timeout |
1da177e4 LT |
1476 | * We do not release the request slot, so we keep using the |
1477 | * same XID for all retransmits. | |
1478 | */ | |
1479 | static void | |
1480 | call_timeout(struct rpc_task *task) | |
1481 | { | |
1482 | struct rpc_clnt *clnt = task->tk_client; | |
1483 | ||
1484 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1485 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1486 | goto retry; |
1487 | } | |
1488 | ||
46121cf7 | 1489 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1490 | task->tk_timeouts++; |
1491 | ||
3a28becc CL |
1492 | if (RPC_IS_SOFTCONN(task)) { |
1493 | rpc_exit(task, -ETIMEDOUT); | |
1494 | return; | |
1495 | } | |
1da177e4 | 1496 | if (RPC_IS_SOFT(task)) { |
b6b6152c OK |
1497 | if (clnt->cl_chatty) |
1498 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", | |
1da177e4 LT |
1499 | clnt->cl_protname, clnt->cl_server); |
1500 | rpc_exit(task, -EIO); | |
1501 | return; | |
1502 | } | |
1503 | ||
f518e35a | 1504 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1505 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
b6b6152c OK |
1506 | if (clnt->cl_chatty) |
1507 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1da177e4 LT |
1508 | clnt->cl_protname, clnt->cl_server); |
1509 | } | |
35f5a422 | 1510 | rpc_force_rebind(clnt); |
b48633bd TM |
1511 | /* |
1512 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1513 | * event? RFC2203 requires the server to drop all such requests. | |
1514 | */ | |
1515 | rpcauth_invalcred(task); | |
1da177e4 LT |
1516 | |
1517 | retry: | |
1518 | clnt->cl_stats->rpcretrans++; | |
1519 | task->tk_action = call_bind; | |
1520 | task->tk_status = 0; | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * 7. Decode the RPC reply | |
1525 | */ | |
1526 | static void | |
1527 | call_decode(struct rpc_task *task) | |
1528 | { | |
1529 | struct rpc_clnt *clnt = task->tk_client; | |
1530 | struct rpc_rqst *req = task->tk_rqstp; | |
1531 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
d8ed029d | 1532 | __be32 *p; |
1da177e4 | 1533 | |
46121cf7 CL |
1534 | dprintk("RPC: %5u call_decode (status %d)\n", |
1535 | task->tk_pid, task->tk_status); | |
1da177e4 | 1536 | |
f518e35a | 1537 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
b6b6152c OK |
1538 | if (clnt->cl_chatty) |
1539 | printk(KERN_NOTICE "%s: server %s OK\n", | |
1540 | clnt->cl_protname, clnt->cl_server); | |
1da177e4 LT |
1541 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1542 | } | |
1543 | ||
43ac3f29 TM |
1544 | /* |
1545 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 1546 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
1547 | */ |
1548 | smp_rmb(); | |
1da177e4 LT |
1549 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1550 | ||
1551 | /* Check that the softirq receive buffer is valid */ | |
1552 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1553 | sizeof(req->rq_rcv_buf)) != 0); | |
1554 | ||
1e799b67 TM |
1555 | if (req->rq_rcv_buf.len < 12) { |
1556 | if (!RPC_IS_SOFT(task)) { | |
1557 | task->tk_action = call_bind; | |
1558 | clnt->cl_stats->rpcretrans++; | |
1559 | goto out_retry; | |
1560 | } | |
1561 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
1562 | clnt->cl_protname, task->tk_status); | |
1563 | task->tk_action = call_timeout; | |
1564 | goto out_retry; | |
1565 | } | |
1566 | ||
b0e1c57e | 1567 | p = rpc_verify_header(task); |
abbcf28f TM |
1568 | if (IS_ERR(p)) { |
1569 | if (p == ERR_PTR(-EAGAIN)) | |
1570 | goto out_retry; | |
1571 | return; | |
1da177e4 LT |
1572 | } |
1573 | ||
abbcf28f | 1574 | task->tk_action = rpc_exit_task; |
1da177e4 | 1575 | |
6d5fcb5a | 1576 | if (decode) { |
1da177e4 LT |
1577 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1578 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1579 | } |
46121cf7 CL |
1580 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1581 | task->tk_status); | |
1da177e4 LT |
1582 | return; |
1583 | out_retry: | |
1da177e4 | 1584 | task->tk_status = 0; |
b0e1c57e | 1585 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 1586 | if (task->tk_rqstp == req) { |
dd2b63d0 | 1587 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 1588 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1589 | xprt_conditional_disconnect(task->tk_xprt, |
1590 | req->rq_connect_cookie); | |
24b74bf0 | 1591 | } |
1da177e4 LT |
1592 | } |
1593 | ||
d8ed029d | 1594 | static __be32 * |
b0e1c57e | 1595 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
1596 | { |
1597 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1598 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1599 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1600 | |
1601 | /* FIXME: check buffer size? */ | |
808012fb CL |
1602 | |
1603 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1604 | *p++ = req->rq_xid; /* XID */ |
1605 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1606 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1607 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1608 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1609 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1610 | p = rpcauth_marshcred(task, p); |
1611 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1612 | return p; | |
1da177e4 LT |
1613 | } |
1614 | ||
d8ed029d | 1615 | static __be32 * |
b0e1c57e | 1616 | rpc_verify_header(struct rpc_task *task) |
1da177e4 LT |
1617 | { |
1618 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1619 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1620 | __be32 *p = iov->iov_base; |
1621 | u32 n; | |
1da177e4 LT |
1622 | int error = -EACCES; |
1623 | ||
e8896495 DH |
1624 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1625 | /* RFC-1014 says that the representation of XDR data must be a | |
1626 | * multiple of four bytes | |
1627 | * - if it isn't pointer subtraction in the NFS client may give | |
1628 | * undefined results | |
1629 | */ | |
8a702bbb | 1630 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 1631 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 1632 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
1633 | goto out_eio; |
1634 | } | |
1da177e4 LT |
1635 | if ((len -= 3) < 0) |
1636 | goto out_overflow; | |
1da177e4 | 1637 | |
f4a2e418 | 1638 | p += 1; /* skip XID */ |
1da177e4 | 1639 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 1640 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 1641 | task->tk_pid, __func__, n); |
abbcf28f | 1642 | goto out_garbage; |
1da177e4 | 1643 | } |
f4a2e418 | 1644 | |
1da177e4 LT |
1645 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
1646 | if (--len < 0) | |
1647 | goto out_overflow; | |
1648 | switch ((n = ntohl(*p++))) { | |
1649 | case RPC_AUTH_ERROR: | |
1650 | break; | |
1651 | case RPC_MISMATCH: | |
46121cf7 CL |
1652 | dprintk("RPC: %5u %s: RPC call version " |
1653 | "mismatch!\n", | |
0dc47877 | 1654 | task->tk_pid, __func__); |
cdf47706 AG |
1655 | error = -EPROTONOSUPPORT; |
1656 | goto out_err; | |
1da177e4 | 1657 | default: |
46121cf7 CL |
1658 | dprintk("RPC: %5u %s: RPC call rejected, " |
1659 | "unknown error: %x\n", | |
0dc47877 | 1660 | task->tk_pid, __func__, n); |
1da177e4 LT |
1661 | goto out_eio; |
1662 | } | |
1663 | if (--len < 0) | |
1664 | goto out_overflow; | |
1665 | switch ((n = ntohl(*p++))) { | |
1666 | case RPC_AUTH_REJECTEDCRED: | |
1667 | case RPC_AUTH_REJECTEDVERF: | |
1668 | case RPCSEC_GSS_CREDPROBLEM: | |
1669 | case RPCSEC_GSS_CTXPROBLEM: | |
1670 | if (!task->tk_cred_retry) | |
1671 | break; | |
1672 | task->tk_cred_retry--; | |
46121cf7 | 1673 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 1674 | task->tk_pid, __func__); |
1da177e4 | 1675 | rpcauth_invalcred(task); |
220bcc2a TM |
1676 | /* Ensure we obtain a new XID! */ |
1677 | xprt_release(task); | |
1da177e4 | 1678 | task->tk_action = call_refresh; |
abbcf28f | 1679 | goto out_retry; |
1da177e4 LT |
1680 | case RPC_AUTH_BADCRED: |
1681 | case RPC_AUTH_BADVERF: | |
1682 | /* possibly garbled cred/verf? */ | |
1683 | if (!task->tk_garb_retry) | |
1684 | break; | |
1685 | task->tk_garb_retry--; | |
46121cf7 | 1686 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 1687 | task->tk_pid, __func__); |
1da177e4 | 1688 | task->tk_action = call_bind; |
abbcf28f | 1689 | goto out_retry; |
1da177e4 | 1690 | case RPC_AUTH_TOOWEAK: |
b0e1c57e | 1691 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
1356b8c2 | 1692 | "authentication.\n", task->tk_client->cl_server); |
1da177e4 LT |
1693 | break; |
1694 | default: | |
8a702bbb | 1695 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 1696 | task->tk_pid, __func__, n); |
1da177e4 LT |
1697 | error = -EIO; |
1698 | } | |
46121cf7 | 1699 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 1700 | task->tk_pid, __func__, n); |
1da177e4 LT |
1701 | goto out_err; |
1702 | } | |
1703 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 1704 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 1705 | task->tk_pid, __func__); |
abbcf28f | 1706 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 1707 | } |
d8ed029d | 1708 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
1709 | if (len < 0) |
1710 | goto out_overflow; | |
1711 | switch ((n = ntohl(*p++))) { | |
1712 | case RPC_SUCCESS: | |
1713 | return p; | |
1714 | case RPC_PROG_UNAVAIL: | |
46121cf7 | 1715 | dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", |
0dc47877 | 1716 | task->tk_pid, __func__, |
1da177e4 LT |
1717 | (unsigned int)task->tk_client->cl_prog, |
1718 | task->tk_client->cl_server); | |
cdf47706 AG |
1719 | error = -EPFNOSUPPORT; |
1720 | goto out_err; | |
1da177e4 | 1721 | case RPC_PROG_MISMATCH: |
46121cf7 | 1722 | dprintk("RPC: %5u %s: program %u, version %u unsupported by " |
0dc47877 | 1723 | "server %s\n", task->tk_pid, __func__, |
1da177e4 LT |
1724 | (unsigned int)task->tk_client->cl_prog, |
1725 | (unsigned int)task->tk_client->cl_vers, | |
1726 | task->tk_client->cl_server); | |
cdf47706 AG |
1727 | error = -EPROTONOSUPPORT; |
1728 | goto out_err; | |
1da177e4 | 1729 | case RPC_PROC_UNAVAIL: |
3748f1e4 | 1730 | dprintk("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 1731 | "version %u on server %s\n", |
0dc47877 | 1732 | task->tk_pid, __func__, |
3748f1e4 | 1733 | rpc_proc_name(task), |
1da177e4 LT |
1734 | task->tk_client->cl_prog, |
1735 | task->tk_client->cl_vers, | |
1736 | task->tk_client->cl_server); | |
cdf47706 AG |
1737 | error = -EOPNOTSUPP; |
1738 | goto out_err; | |
1da177e4 | 1739 | case RPC_GARBAGE_ARGS: |
46121cf7 | 1740 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 1741 | task->tk_pid, __func__); |
1da177e4 LT |
1742 | break; /* retry */ |
1743 | default: | |
8a702bbb | 1744 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 1745 | task->tk_pid, __func__, n); |
1da177e4 LT |
1746 | /* Also retry */ |
1747 | } | |
1748 | ||
abbcf28f | 1749 | out_garbage: |
1da177e4 LT |
1750 | task->tk_client->cl_stats->rpcgarbage++; |
1751 | if (task->tk_garb_retry) { | |
1752 | task->tk_garb_retry--; | |
46121cf7 | 1753 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 1754 | task->tk_pid, __func__); |
1da177e4 | 1755 | task->tk_action = call_bind; |
abbcf28f TM |
1756 | out_retry: |
1757 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 1758 | } |
1da177e4 LT |
1759 | out_eio: |
1760 | error = -EIO; | |
1761 | out_err: | |
1762 | rpc_exit(task, error); | |
8a702bbb | 1763 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 1764 | __func__, error); |
abbcf28f | 1765 | return ERR_PTR(error); |
1da177e4 | 1766 | out_overflow: |
8a702bbb | 1767 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 1768 | __func__); |
abbcf28f | 1769 | goto out_garbage; |
1da177e4 | 1770 | } |
5ee0ed7d | 1771 | |
d8ed029d | 1772 | static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1773 | { |
1774 | return 0; | |
1775 | } | |
1776 | ||
d8ed029d | 1777 | static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) |
5ee0ed7d TM |
1778 | { |
1779 | return 0; | |
1780 | } | |
1781 | ||
1782 | static struct rpc_procinfo rpcproc_null = { | |
1783 | .p_encode = rpcproc_encode_null, | |
1784 | .p_decode = rpcproc_decode_null, | |
1785 | }; | |
1786 | ||
caabea8a | 1787 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
1788 | { |
1789 | struct rpc_message msg = { | |
1790 | .rpc_proc = &rpcproc_null, | |
1791 | }; | |
1792 | int err; | |
1793 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 1794 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
1795 | put_rpccred(msg.rpc_cred); |
1796 | return err; | |
1797 | } | |
188fef11 | 1798 | |
5e1550d6 TM |
1799 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
1800 | { | |
1801 | struct rpc_message msg = { | |
1802 | .rpc_proc = &rpcproc_null, | |
1803 | .rpc_cred = cred, | |
1804 | }; | |
84115e1c TM |
1805 | struct rpc_task_setup task_setup_data = { |
1806 | .rpc_client = clnt, | |
1807 | .rpc_message = &msg, | |
1808 | .callback_ops = &rpc_default_ops, | |
1809 | .flags = flags, | |
1810 | }; | |
c970aa85 | 1811 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 1812 | } |
e8914c65 | 1813 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 1814 | |
188fef11 | 1815 | #ifdef RPC_DEBUG |
68a23ee9 CL |
1816 | static void rpc_show_header(void) |
1817 | { | |
cb3997b5 CL |
1818 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
1819 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
1820 | } |
1821 | ||
38e886e0 CL |
1822 | static void rpc_show_task(const struct rpc_clnt *clnt, |
1823 | const struct rpc_task *task) | |
1824 | { | |
1825 | const char *rpc_waitq = "none"; | |
cb3997b5 | 1826 | char *p, action[KSYM_SYMBOL_LEN]; |
38e886e0 CL |
1827 | |
1828 | if (RPC_IS_QUEUED(task)) | |
1829 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
1830 | ||
cb3997b5 CL |
1831 | /* map tk_action pointer to a function name; then trim off |
1832 | * the "+0x0 [sunrpc]" */ | |
1833 | sprint_symbol(action, (unsigned long)task->tk_action); | |
1834 | p = strchr(action, '+'); | |
1835 | if (p) | |
1836 | *p = '\0'; | |
1837 | ||
1838 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n", | |
1839 | task->tk_pid, task->tk_flags, task->tk_status, | |
1840 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
1841 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), | |
1842 | action, rpc_waitq); | |
38e886e0 CL |
1843 | } |
1844 | ||
188fef11 TM |
1845 | void rpc_show_tasks(void) |
1846 | { | |
1847 | struct rpc_clnt *clnt; | |
38e886e0 | 1848 | struct rpc_task *task; |
68a23ee9 | 1849 | int header = 0; |
188fef11 TM |
1850 | |
1851 | spin_lock(&rpc_client_lock); | |
188fef11 | 1852 | list_for_each_entry(clnt, &all_clients, cl_clients) { |
188fef11 | 1853 | spin_lock(&clnt->cl_lock); |
38e886e0 | 1854 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
1855 | if (!header) { |
1856 | rpc_show_header(); | |
1857 | header++; | |
1858 | } | |
38e886e0 | 1859 | rpc_show_task(clnt, task); |
188fef11 TM |
1860 | } |
1861 | spin_unlock(&clnt->cl_lock); | |
1862 | } | |
188fef11 TM |
1863 | spin_unlock(&rpc_client_lock); |
1864 | } | |
1865 | #endif |