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 | ||
1da177e4 LT |
20 | |
21 | #include <linux/module.h> | |
22 | #include <linux/types.h> | |
cb3997b5 | 23 | #include <linux/kallsyms.h> |
1da177e4 | 24 | #include <linux/mm.h> |
23ac6581 TM |
25 | #include <linux/namei.h> |
26 | #include <linux/mount.h> | |
1da177e4 | 27 | #include <linux/slab.h> |
1da177e4 | 28 | #include <linux/utsname.h> |
11c556b3 | 29 | #include <linux/workqueue.h> |
176e21ee | 30 | #include <linux/in.h> |
510deb0d | 31 | #include <linux/in6.h> |
176e21ee | 32 | #include <linux/un.h> |
2446ab60 | 33 | #include <linux/rcupdate.h> |
1da177e4 LT |
34 | |
35 | #include <linux/sunrpc/clnt.h> | |
5976687a | 36 | #include <linux/sunrpc/addr.h> |
1da177e4 | 37 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 38 | #include <linux/sunrpc/metrics.h> |
55ae1aab | 39 | #include <linux/sunrpc/bc_xprt.h> |
5753cba1 | 40 | #include <trace/events/sunrpc.h> |
1da177e4 | 41 | |
55ae1aab | 42 | #include "sunrpc.h" |
70abc49b | 43 | #include "netns.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | #ifdef RPC_DEBUG |
46 | # define RPCDBG_FACILITY RPCDBG_CALL | |
47 | #endif | |
48 | ||
46121cf7 CL |
49 | #define dprint_status(t) \ |
50 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 51 | __func__, t->tk_status) |
46121cf7 | 52 | |
188fef11 TM |
53 | /* |
54 | * All RPC clients are linked into this list | |
55 | */ | |
188fef11 | 56 | |
1da177e4 LT |
57 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
58 | ||
59 | ||
60 | static void call_start(struct rpc_task *task); | |
61 | static void call_reserve(struct rpc_task *task); | |
62 | static void call_reserveresult(struct rpc_task *task); | |
63 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
64 | static void call_decode(struct rpc_task *task); |
65 | static void call_bind(struct rpc_task *task); | |
da351878 | 66 | static void call_bind_status(struct rpc_task *task); |
1da177e4 | 67 | static void call_transmit(struct rpc_task *task); |
9e00abc3 | 68 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab | 69 | static void call_bc_transmit(struct rpc_task *task); |
9e00abc3 | 70 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1da177e4 | 71 | static void call_status(struct rpc_task *task); |
940e3318 | 72 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
73 | static void call_refresh(struct rpc_task *task); |
74 | static void call_refreshresult(struct rpc_task *task); | |
75 | static void call_timeout(struct rpc_task *task); | |
76 | static void call_connect(struct rpc_task *task); | |
77 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 78 | |
b0e1c57e CL |
79 | static __be32 *rpc_encode_header(struct rpc_task *task); |
80 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
caabea8a | 81 | static int rpc_ping(struct rpc_clnt *clnt); |
64c91a1f | 82 | |
188fef11 TM |
83 | static void rpc_register_client(struct rpc_clnt *clnt) |
84 | { | |
2446ab60 TM |
85 | struct net *net = rpc_net_ns(clnt); |
86 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
87 | |
88 | spin_lock(&sn->rpc_client_lock); | |
89 | list_add(&clnt->cl_clients, &sn->all_clients); | |
90 | spin_unlock(&sn->rpc_client_lock); | |
188fef11 TM |
91 | } |
92 | ||
93 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
94 | { | |
2446ab60 TM |
95 | struct net *net = rpc_net_ns(clnt); |
96 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
97 | |
98 | spin_lock(&sn->rpc_client_lock); | |
188fef11 | 99 | list_del(&clnt->cl_clients); |
70abc49b | 100 | spin_unlock(&sn->rpc_client_lock); |
188fef11 | 101 | } |
1da177e4 | 102 | |
0157d021 SK |
103 | static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) |
104 | { | |
5f42b016 | 105 | if (clnt->cl_dentry) |
6739ffb7 | 106 | rpc_remove_client_dir(clnt->cl_dentry, clnt); |
30507f58 | 107 | clnt->cl_dentry = NULL; |
0157d021 SK |
108 | } |
109 | ||
110 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
111 | { | |
2446ab60 | 112 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 113 | struct super_block *pipefs_sb; |
0157d021 | 114 | |
2446ab60 | 115 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 116 | if (pipefs_sb) { |
0157d021 | 117 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 118 | rpc_put_sb_net(net); |
0157d021 | 119 | } |
0157d021 SK |
120 | } |
121 | ||
122 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
41b6b4d0 | 123 | struct rpc_clnt *clnt) |
1da177e4 | 124 | { |
f134585a | 125 | static uint32_t clntid; |
41b6b4d0 | 126 | const char *dir_name = clnt->cl_program->pipe_dir_name; |
23ac6581 | 127 | char name[15]; |
0157d021 | 128 | struct dentry *dir, *dentry; |
1da177e4 | 129 | |
0157d021 | 130 | dir = rpc_d_lookup_sb(sb, dir_name); |
922eeac3 WAA |
131 | if (dir == NULL) { |
132 | pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); | |
0157d021 | 133 | return dir; |
922eeac3 | 134 | } |
f134585a | 135 | for (;;) { |
a95e691f | 136 | snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
23ac6581 | 137 | name[sizeof(name) - 1] = '\0'; |
a95e691f | 138 | dentry = rpc_create_client_dir(dir, name, clnt); |
0157d021 | 139 | if (!IS_ERR(dentry)) |
23ac6581 | 140 | break; |
a95e691f AV |
141 | if (dentry == ERR_PTR(-EEXIST)) |
142 | continue; | |
143 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" | |
144 | " %s/%s, error %ld\n", | |
145 | dir_name, name, PTR_ERR(dentry)); | |
146 | break; | |
1da177e4 | 147 | } |
0157d021 SK |
148 | dput(dir); |
149 | return dentry; | |
150 | } | |
151 | ||
152 | static int | |
41b6b4d0 | 153 | rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt) |
0157d021 | 154 | { |
30507f58 | 155 | struct dentry *dentry; |
0157d021 | 156 | |
41b6b4d0 TM |
157 | if (clnt->cl_program->pipe_dir_name == NULL) |
158 | goto out; | |
30507f58 | 159 | clnt->cl_dentry = NULL; |
41b6b4d0 | 160 | dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt); |
30507f58 SK |
161 | if (IS_ERR(dentry)) |
162 | return PTR_ERR(dentry); | |
163 | clnt->cl_dentry = dentry; | |
41b6b4d0 | 164 | out: |
23ac6581 | 165 | return 0; |
1da177e4 LT |
166 | } |
167 | ||
41b6b4d0 | 168 | static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) |
ea8cfa06 | 169 | { |
41b6b4d0 TM |
170 | if (clnt->cl_program->pipe_dir_name == NULL) |
171 | return 1; | |
172 | ||
ea8cfa06 SK |
173 | if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) || |
174 | ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry)) | |
175 | return 1; | |
4f6bb246 SK |
176 | if ((event == RPC_PIPEFS_MOUNT) && atomic_read(&clnt->cl_count) == 0) |
177 | return 1; | |
ea8cfa06 SK |
178 | return 0; |
179 | } | |
180 | ||
181 | static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, | |
182 | struct super_block *sb) | |
80df9d20 SK |
183 | { |
184 | struct dentry *dentry; | |
185 | int err = 0; | |
186 | ||
187 | switch (event) { | |
188 | case RPC_PIPEFS_MOUNT: | |
41b6b4d0 | 189 | dentry = rpc_setup_pipedir_sb(sb, clnt); |
922eeac3 WAA |
190 | if (!dentry) |
191 | return -ENOENT; | |
80df9d20 SK |
192 | if (IS_ERR(dentry)) |
193 | return PTR_ERR(dentry); | |
30507f58 | 194 | clnt->cl_dentry = dentry; |
80df9d20 SK |
195 | break; |
196 | case RPC_PIPEFS_UMOUNT: | |
197 | __rpc_clnt_remove_pipedir(clnt); | |
198 | break; | |
199 | default: | |
200 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
201 | return -ENOTSUPP; | |
202 | } | |
203 | return err; | |
204 | } | |
205 | ||
ea8cfa06 SK |
206 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
207 | struct super_block *sb) | |
208 | { | |
209 | int error = 0; | |
210 | ||
211 | for (;; clnt = clnt->cl_parent) { | |
212 | if (!rpc_clnt_skip_event(clnt, event)) | |
213 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
214 | if (error || clnt == clnt->cl_parent) | |
215 | break; | |
216 | } | |
217 | return error; | |
218 | } | |
219 | ||
da3b4622 SK |
220 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
221 | { | |
222 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
223 | struct rpc_clnt *clnt; | |
224 | ||
225 | spin_lock(&sn->rpc_client_lock); | |
226 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
ea8cfa06 | 227 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 228 | continue; |
da3b4622 SK |
229 | spin_unlock(&sn->rpc_client_lock); |
230 | return clnt; | |
231 | } | |
232 | spin_unlock(&sn->rpc_client_lock); | |
233 | return NULL; | |
234 | } | |
235 | ||
80df9d20 SK |
236 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
237 | void *ptr) | |
238 | { | |
239 | struct super_block *sb = ptr; | |
240 | struct rpc_clnt *clnt; | |
241 | int error = 0; | |
80df9d20 | 242 | |
da3b4622 | 243 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 SK |
244 | error = __rpc_pipefs_event(clnt, event, sb); |
245 | if (error) | |
246 | break; | |
247 | } | |
80df9d20 SK |
248 | return error; |
249 | } | |
250 | ||
251 | static struct notifier_block rpc_clients_block = { | |
252 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 253 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
254 | }; |
255 | ||
256 | int rpc_clients_notifier_register(void) | |
257 | { | |
258 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
259 | } | |
260 | ||
261 | void rpc_clients_notifier_unregister(void) | |
262 | { | |
263 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
264 | } | |
265 | ||
cbbb3449 TM |
266 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
267 | { | |
268 | clnt->cl_nodelen = strlen(nodename); | |
269 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
270 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
271 | memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen); | |
272 | } | |
273 | ||
e73f4cc0 SK |
274 | static int rpc_client_register(const struct rpc_create_args *args, |
275 | struct rpc_clnt *clnt) | |
276 | { | |
c2190661 TM |
277 | struct rpc_auth_create_args auth_args = { |
278 | .pseudoflavor = args->authflavor, | |
279 | .target_name = args->client_name, | |
280 | }; | |
e73f4cc0 SK |
281 | struct rpc_auth *auth; |
282 | struct net *net = rpc_net_ns(clnt); | |
283 | struct super_block *pipefs_sb; | |
eeee2452 | 284 | int err; |
e73f4cc0 SK |
285 | |
286 | pipefs_sb = rpc_get_sb_net(net); | |
287 | if (pipefs_sb) { | |
41b6b4d0 | 288 | err = rpc_setup_pipedir(pipefs_sb, clnt); |
e73f4cc0 SK |
289 | if (err) |
290 | goto out; | |
291 | } | |
292 | ||
eeee2452 TM |
293 | rpc_register_client(clnt); |
294 | if (pipefs_sb) | |
295 | rpc_put_sb_net(net); | |
296 | ||
c2190661 | 297 | auth = rpcauth_create(&auth_args, clnt); |
e73f4cc0 SK |
298 | if (IS_ERR(auth)) { |
299 | dprintk("RPC: Couldn't create auth handle (flavor %u)\n", | |
300 | args->authflavor); | |
301 | err = PTR_ERR(auth); | |
302 | goto err_auth; | |
303 | } | |
eeee2452 TM |
304 | return 0; |
305 | err_auth: | |
306 | pipefs_sb = rpc_get_sb_net(net); | |
1540c5d3 | 307 | rpc_unregister_client(clnt); |
eeee2452 | 308 | __rpc_clnt_remove_pipedir(clnt); |
e73f4cc0 SK |
309 | out: |
310 | if (pipefs_sb) | |
311 | rpc_put_sb_net(net); | |
312 | return err; | |
e73f4cc0 SK |
313 | } |
314 | ||
698b6d08 | 315 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 316 | { |
a613fa16 TM |
317 | const struct rpc_program *program = args->program; |
318 | const struct rpc_version *version; | |
1da177e4 LT |
319 | struct rpc_clnt *clnt = NULL; |
320 | int err; | |
06b8d255 CL |
321 | |
322 | /* sanity check the name before trying to print it */ | |
46121cf7 | 323 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 324 | program->name, args->servername, xprt); |
1da177e4 | 325 | |
4ada539e TM |
326 | err = rpciod_up(); |
327 | if (err) | |
328 | goto out_no_rpciod; | |
698b6d08 | 329 | |
f05c124a | 330 | err = -EINVAL; |
698b6d08 TM |
331 | if (args->version >= program->nrvers) |
332 | goto out_err; | |
333 | version = program->version[args->version]; | |
334 | if (version == NULL) | |
1da177e4 LT |
335 | goto out_err; |
336 | ||
337 | err = -ENOMEM; | |
0da974f4 | 338 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
339 | if (!clnt) |
340 | goto out_err; | |
1da177e4 LT |
341 | clnt->cl_parent = clnt; |
342 | ||
2446ab60 | 343 | rcu_assign_pointer(clnt->cl_xprt, xprt); |
1da177e4 LT |
344 | clnt->cl_procinfo = version->procs; |
345 | clnt->cl_maxproc = version->nrprocs; | |
d5b337b4 | 346 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 347 | clnt->cl_vers = version->number; |
1da177e4 | 348 | clnt->cl_stats = program->stats; |
11c556b3 | 349 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
6739ffb7 | 350 | rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); |
23bf85ba TM |
351 | err = -ENOMEM; |
352 | if (clnt->cl_metrics == NULL) | |
353 | goto out_no_stats; | |
3e32a5d9 | 354 | clnt->cl_program = program; |
6529eba0 | 355 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 356 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 357 | |
2446ab60 | 358 | if (!xprt_bound(xprt)) |
1da177e4 LT |
359 | clnt->cl_autobind = 1; |
360 | ||
ba7392bb TM |
361 | clnt->cl_timeout = xprt->timeout; |
362 | if (args->timeout != NULL) { | |
363 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
364 | sizeof(clnt->cl_timeout_default)); | |
365 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
366 | } | |
367 | ||
1da177e4 | 368 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 369 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
1da177e4 | 370 | |
006abe88 | 371 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 372 | |
1da177e4 | 373 | /* save the nodename */ |
cbbb3449 | 374 | rpc_clnt_set_nodename(clnt, utsname()->nodename); |
e73f4cc0 SK |
375 | |
376 | err = rpc_client_register(args, clnt); | |
377 | if (err) | |
378 | goto out_no_path; | |
1da177e4 LT |
379 | return clnt; |
380 | ||
1da177e4 | 381 | out_no_path: |
23bf85ba TM |
382 | rpc_free_iostats(clnt->cl_metrics); |
383 | out_no_stats: | |
1da177e4 LT |
384 | kfree(clnt); |
385 | out_err: | |
4ada539e TM |
386 | rpciod_down(); |
387 | out_no_rpciod: | |
f05c124a | 388 | xprt_put(xprt); |
1da177e4 LT |
389 | return ERR_PTR(err); |
390 | } | |
391 | ||
2c53040f | 392 | /** |
c2866763 CL |
393 | * rpc_create - create an RPC client and transport with one call |
394 | * @args: rpc_clnt create argument structure | |
395 | * | |
396 | * Creates and initializes an RPC transport and an RPC client. | |
397 | * | |
398 | * It can ping the server in order to determine if it is up, and to see if | |
399 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
400 | * this behavior so asynchronous tasks can also use rpc_create. | |
401 | */ | |
402 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
403 | { | |
404 | struct rpc_xprt *xprt; | |
405 | struct rpc_clnt *clnt; | |
3c341b0b | 406 | struct xprt_create xprtargs = { |
9a23e332 | 407 | .net = args->net, |
4fa016eb | 408 | .ident = args->protocol, |
d3bc9a1d | 409 | .srcaddr = args->saddress, |
96802a09 FM |
410 | .dstaddr = args->address, |
411 | .addrlen = args->addrsize, | |
4e0038b6 | 412 | .servername = args->servername, |
f300baba | 413 | .bc_xprt = args->bc_xprt, |
96802a09 | 414 | }; |
510deb0d | 415 | char servername[48]; |
c2866763 | 416 | |
b7993ceb TM |
417 | if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) |
418 | xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; | |
33d90ac0 BF |
419 | if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) |
420 | xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; | |
43780b87 CL |
421 | /* |
422 | * If the caller chooses not to specify a hostname, whip | |
423 | * up a string representation of the passed-in address. | |
424 | */ | |
4e0038b6 | 425 | if (xprtargs.servername == NULL) { |
176e21ee CL |
426 | struct sockaddr_un *sun = |
427 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
428 | struct sockaddr_in *sin = |
429 | (struct sockaddr_in *)args->address; | |
430 | struct sockaddr_in6 *sin6 = | |
431 | (struct sockaddr_in6 *)args->address; | |
432 | ||
510deb0d CL |
433 | servername[0] = '\0'; |
434 | switch (args->address->sa_family) { | |
176e21ee CL |
435 | case AF_LOCAL: |
436 | snprintf(servername, sizeof(servername), "%s", | |
437 | sun->sun_path); | |
438 | break; | |
da09eb93 | 439 | case AF_INET: |
21454aaa HH |
440 | snprintf(servername, sizeof(servername), "%pI4", |
441 | &sin->sin_addr.s_addr); | |
510deb0d | 442 | break; |
da09eb93 | 443 | case AF_INET6: |
5b095d98 | 444 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 445 | &sin6->sin6_addr); |
510deb0d | 446 | break; |
510deb0d CL |
447 | default: |
448 | /* caller wants default server name, but | |
449 | * address family isn't recognized. */ | |
450 | return ERR_PTR(-EINVAL); | |
451 | } | |
4e0038b6 | 452 | xprtargs.servername = servername; |
43780b87 CL |
453 | } |
454 | ||
510deb0d CL |
455 | xprt = xprt_create_transport(&xprtargs); |
456 | if (IS_ERR(xprt)) | |
457 | return (struct rpc_clnt *)xprt; | |
458 | ||
c2866763 CL |
459 | /* |
460 | * By default, kernel RPC client connects from a reserved port. | |
461 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
462 | * but it is always enabled for rpciod, which handles the connect | |
463 | * operation. | |
464 | */ | |
465 | xprt->resvport = 1; | |
466 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
467 | xprt->resvport = 0; | |
468 | ||
698b6d08 | 469 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
470 | if (IS_ERR(clnt)) |
471 | return clnt; | |
472 | ||
473 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
caabea8a | 474 | int err = rpc_ping(clnt); |
c2866763 CL |
475 | if (err != 0) { |
476 | rpc_shutdown_client(clnt); | |
477 | return ERR_PTR(err); | |
478 | } | |
479 | } | |
480 | ||
481 | clnt->cl_softrtry = 1; | |
482 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
483 | clnt->cl_softrtry = 0; | |
484 | ||
c2866763 CL |
485 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
486 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
487 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
488 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
489 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
490 | clnt->cl_chatty = 1; | |
c2866763 CL |
491 | |
492 | return clnt; | |
493 | } | |
b86acd50 | 494 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 495 | |
1da177e4 LT |
496 | /* |
497 | * This function clones the RPC client structure. It allows us to share the | |
498 | * same transport while varying parameters such as the authentication | |
499 | * flavour. | |
500 | */ | |
1b63a751 CL |
501 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
502 | struct rpc_clnt *clnt) | |
1da177e4 | 503 | { |
2446ab60 | 504 | struct rpc_xprt *xprt; |
1b63a751 CL |
505 | struct rpc_clnt *new; |
506 | int err; | |
1da177e4 | 507 | |
1b63a751 | 508 | err = -ENOMEM; |
2446ab60 TM |
509 | rcu_read_lock(); |
510 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
511 | rcu_read_unlock(); | |
512 | if (xprt == NULL) | |
1b63a751 CL |
513 | goto out_err; |
514 | args->servername = xprt->servername; | |
515 | ||
516 | new = rpc_new_client(args, xprt); | |
517 | if (IS_ERR(new)) { | |
518 | err = PTR_ERR(new); | |
a58e0be6 | 519 | goto out_err; |
1b63a751 CL |
520 | } |
521 | ||
006abe88 | 522 | atomic_inc(&clnt->cl_count); |
1b63a751 CL |
523 | new->cl_parent = clnt; |
524 | ||
525 | /* Turn off autobind on clones */ | |
526 | new->cl_autobind = 0; | |
527 | new->cl_softrtry = clnt->cl_softrtry; | |
528 | new->cl_discrtry = clnt->cl_discrtry; | |
529 | new->cl_chatty = clnt->cl_chatty; | |
1da177e4 | 530 | return new; |
1b63a751 | 531 | |
1b63a751 | 532 | out_err: |
0dc47877 | 533 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 534 | return ERR_PTR(err); |
1da177e4 | 535 | } |
1b63a751 CL |
536 | |
537 | /** | |
538 | * rpc_clone_client - Clone an RPC client structure | |
539 | * | |
540 | * @clnt: RPC client whose parameters are copied | |
541 | * | |
542 | * Returns a fresh RPC client or an ERR_PTR. | |
543 | */ | |
544 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
545 | { | |
546 | struct rpc_create_args args = { | |
547 | .program = clnt->cl_program, | |
548 | .prognumber = clnt->cl_prog, | |
549 | .version = clnt->cl_vers, | |
550 | .authflavor = clnt->cl_auth->au_flavor, | |
1b63a751 CL |
551 | }; |
552 | return __rpc_clone_client(&args, clnt); | |
553 | } | |
e8914c65 | 554 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 555 | |
ba9b584c CL |
556 | /** |
557 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
558 | * | |
559 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 560 | * @flavor: security flavor for new client |
ba9b584c CL |
561 | * |
562 | * Returns a fresh RPC client or an ERR_PTR. | |
563 | */ | |
564 | struct rpc_clnt * | |
565 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
566 | { | |
567 | struct rpc_create_args args = { | |
568 | .program = clnt->cl_program, | |
569 | .prognumber = clnt->cl_prog, | |
570 | .version = clnt->cl_vers, | |
571 | .authflavor = flavor, | |
ba9b584c CL |
572 | }; |
573 | return __rpc_clone_client(&args, clnt); | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
576 | ||
58f9612c TM |
577 | /* |
578 | * Kill all tasks for the given client. | |
579 | * XXX: kill their descendants as well? | |
580 | */ | |
581 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
582 | { | |
583 | struct rpc_task *rovr; | |
584 | ||
585 | ||
586 | if (list_empty(&clnt->cl_tasks)) | |
587 | return; | |
588 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
589 | /* | |
590 | * Spin lock all_tasks to prevent changes... | |
591 | */ | |
592 | spin_lock(&clnt->cl_lock); | |
593 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
594 | if (!RPC_IS_ACTIVATED(rovr)) | |
595 | continue; | |
596 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
597 | rovr->tk_flags |= RPC_TASK_KILLED; | |
598 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
599 | if (RPC_IS_QUEUED(rovr)) |
600 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
601 | rovr); | |
58f9612c TM |
602 | } |
603 | } | |
604 | spin_unlock(&clnt->cl_lock); | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
607 | ||
1da177e4 LT |
608 | /* |
609 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 610 | * requests. |
1da177e4 | 611 | */ |
4c402b40 | 612 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 613 | { |
168e4b39 WAA |
614 | might_sleep(); |
615 | ||
4e0038b6 | 616 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
55909f21 | 617 | clnt->cl_program->name, |
4e0038b6 | 618 | rcu_dereference(clnt->cl_xprt)->servername); |
1da177e4 | 619 | |
34f52e35 | 620 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 621 | rpc_killall_tasks(clnt); |
532347e2 | 622 | wait_event_timeout(destroy_wait, |
34f52e35 | 623 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
624 | } |
625 | ||
4c402b40 | 626 | rpc_release_client(clnt); |
1da177e4 | 627 | } |
e8914c65 | 628 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
629 | |
630 | /* | |
34f52e35 | 631 | * Free an RPC client |
1da177e4 | 632 | */ |
34f52e35 | 633 | static void |
006abe88 | 634 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 635 | { |
4e0038b6 | 636 | dprintk_rcu("RPC: destroying %s client for %s\n", |
55909f21 | 637 | clnt->cl_program->name, |
4e0038b6 | 638 | rcu_dereference(clnt->cl_xprt)->servername); |
6eac7d3f | 639 | if (clnt->cl_parent != clnt) |
8ad7c892 | 640 | rpc_release_client(clnt->cl_parent); |
f5131257 | 641 | rpc_clnt_remove_pipedir(clnt); |
adb6fa7f | 642 | rpc_unregister_client(clnt); |
11c556b3 CL |
643 | rpc_free_iostats(clnt->cl_metrics); |
644 | clnt->cl_metrics = NULL; | |
2446ab60 | 645 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
4ada539e | 646 | rpciod_down(); |
1da177e4 | 647 | kfree(clnt); |
1da177e4 LT |
648 | } |
649 | ||
1dd17ec6 TM |
650 | /* |
651 | * Free an RPC client | |
652 | */ | |
653 | static void | |
006abe88 | 654 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 655 | { |
1dd17ec6 | 656 | if (clnt->cl_auth == NULL) { |
006abe88 | 657 | rpc_free_client(clnt); |
1dd17ec6 TM |
658 | return; |
659 | } | |
660 | ||
661 | /* | |
662 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
663 | * release remaining GSS contexts. This mechanism ensures | |
664 | * that it can do so safely. | |
665 | */ | |
006abe88 | 666 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
667 | rpcauth_release(clnt->cl_auth); |
668 | clnt->cl_auth = NULL; | |
006abe88 TM |
669 | if (atomic_dec_and_test(&clnt->cl_count)) |
670 | rpc_free_client(clnt); | |
1dd17ec6 TM |
671 | } |
672 | ||
1da177e4 | 673 | /* |
34f52e35 | 674 | * Release reference to the RPC client |
1da177e4 LT |
675 | */ |
676 | void | |
677 | rpc_release_client(struct rpc_clnt *clnt) | |
678 | { | |
34f52e35 | 679 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 680 | |
34f52e35 TM |
681 | if (list_empty(&clnt->cl_tasks)) |
682 | wake_up(&destroy_wait); | |
006abe88 TM |
683 | if (atomic_dec_and_test(&clnt->cl_count)) |
684 | rpc_free_auth(clnt); | |
34f52e35 | 685 | } |
1d658336 | 686 | EXPORT_SYMBOL_GPL(rpc_release_client); |
34f52e35 | 687 | |
007e251f AG |
688 | /** |
689 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
690 | * @old: old rpc_client |
691 | * @program: rpc program to set | |
692 | * @vers: rpc program version | |
007e251f AG |
693 | * |
694 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
695 | * of use for enabling different RPC programs to share the same transport. | |
696 | * The Sun NFSv2/v3 ACL protocol can do this. | |
697 | */ | |
698 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 699 | const struct rpc_program *program, |
89eb21c3 | 700 | u32 vers) |
007e251f | 701 | { |
f994c43d TM |
702 | struct rpc_create_args args = { |
703 | .program = program, | |
704 | .prognumber = program->number, | |
705 | .version = vers, | |
706 | .authflavor = old->cl_auth->au_flavor, | |
f994c43d | 707 | }; |
007e251f | 708 | struct rpc_clnt *clnt; |
007e251f AG |
709 | int err; |
710 | ||
f994c43d | 711 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
712 | if (IS_ERR(clnt)) |
713 | goto out; | |
caabea8a | 714 | err = rpc_ping(clnt); |
007e251f AG |
715 | if (err != 0) { |
716 | rpc_shutdown_client(clnt); | |
717 | clnt = ERR_PTR(err); | |
718 | } | |
cca5172a | 719 | out: |
007e251f AG |
720 | return clnt; |
721 | } | |
e8914c65 | 722 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 723 | |
58f9612c TM |
724 | void rpc_task_release_client(struct rpc_task *task) |
725 | { | |
726 | struct rpc_clnt *clnt = task->tk_client; | |
727 | ||
728 | if (clnt != NULL) { | |
729 | /* Remove from client task list */ | |
730 | spin_lock(&clnt->cl_lock); | |
731 | list_del(&task->tk_task); | |
732 | spin_unlock(&clnt->cl_lock); | |
733 | task->tk_client = NULL; | |
734 | ||
735 | rpc_release_client(clnt); | |
736 | } | |
737 | } | |
738 | ||
739 | static | |
740 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
741 | { | |
742 | if (clnt != NULL) { | |
743 | rpc_task_release_client(task); | |
744 | task->tk_client = clnt; | |
006abe88 | 745 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
746 | if (clnt->cl_softrtry) |
747 | task->tk_flags |= RPC_TASK_SOFT; | |
a564b8f0 MG |
748 | if (sk_memalloc_socks()) { |
749 | struct rpc_xprt *xprt; | |
750 | ||
751 | rcu_read_lock(); | |
752 | xprt = rcu_dereference(clnt->cl_xprt); | |
753 | if (xprt->swapper) | |
754 | task->tk_flags |= RPC_TASK_SWAPPER; | |
755 | rcu_read_unlock(); | |
756 | } | |
58f9612c TM |
757 | /* Add to the client's list of all tasks */ |
758 | spin_lock(&clnt->cl_lock); | |
759 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
760 | spin_unlock(&clnt->cl_lock); | |
761 | } | |
762 | } | |
763 | ||
cbdabc7f AA |
764 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
765 | { | |
766 | rpc_task_release_client(task); | |
767 | rpc_task_set_client(task, clnt); | |
768 | } | |
769 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
770 | ||
771 | ||
58f9612c TM |
772 | static void |
773 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
774 | { | |
775 | if (msg != NULL) { | |
776 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
777 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
778 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
779 | if (msg->rpc_cred != NULL) |
780 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
781 | } |
782 | } | |
783 | ||
1da177e4 LT |
784 | /* |
785 | * Default callback for async RPC calls | |
786 | */ | |
787 | static void | |
963d8fe5 | 788 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
789 | { |
790 | } | |
791 | ||
963d8fe5 TM |
792 | static const struct rpc_call_ops rpc_default_ops = { |
793 | .rpc_call_done = rpc_default_callback, | |
794 | }; | |
795 | ||
c970aa85 TM |
796 | /** |
797 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
798 | * @task_setup_data: pointer to task initialisation data | |
799 | */ | |
800 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 801 | { |
19445b99 | 802 | struct rpc_task *task; |
6e5b70e9 | 803 | |
84115e1c | 804 | task = rpc_new_task(task_setup_data); |
19445b99 | 805 | if (IS_ERR(task)) |
50859259 | 806 | goto out; |
6e5b70e9 | 807 | |
58f9612c TM |
808 | rpc_task_set_client(task, task_setup_data->rpc_client); |
809 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
810 | ||
58f9612c TM |
811 | if (task->tk_action == NULL) |
812 | rpc_call_start(task); | |
813 | ||
6e5b70e9 TM |
814 | atomic_inc(&task->tk_count); |
815 | rpc_execute(task); | |
6e5b70e9 | 816 | out: |
19445b99 | 817 | return task; |
6e5b70e9 | 818 | } |
c970aa85 | 819 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
820 | |
821 | /** | |
822 | * rpc_call_sync - Perform a synchronous RPC call | |
823 | * @clnt: pointer to RPC client | |
824 | * @msg: RPC call parameters | |
825 | * @flags: RPC call flags | |
1da177e4 | 826 | */ |
cbc20059 | 827 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
828 | { |
829 | struct rpc_task *task; | |
84115e1c TM |
830 | struct rpc_task_setup task_setup_data = { |
831 | .rpc_client = clnt, | |
832 | .rpc_message = msg, | |
833 | .callback_ops = &rpc_default_ops, | |
834 | .flags = flags, | |
835 | }; | |
6e5b70e9 | 836 | int status; |
1da177e4 | 837 | |
50d2bdb1 WAA |
838 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
839 | if (flags & RPC_TASK_ASYNC) { | |
840 | rpc_release_calldata(task_setup_data.callback_ops, | |
841 | task_setup_data.callback_data); | |
842 | return -EINVAL; | |
843 | } | |
1da177e4 | 844 | |
c970aa85 | 845 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
846 | if (IS_ERR(task)) |
847 | return PTR_ERR(task); | |
e60859ac | 848 | status = task->tk_status; |
bde8f00c | 849 | rpc_put_task(task); |
1da177e4 LT |
850 | return status; |
851 | } | |
e8914c65 | 852 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 853 | |
6e5b70e9 TM |
854 | /** |
855 | * rpc_call_async - Perform an asynchronous RPC call | |
856 | * @clnt: pointer to RPC client | |
857 | * @msg: RPC call parameters | |
858 | * @flags: RPC call flags | |
65b6e42c | 859 | * @tk_ops: RPC call ops |
6e5b70e9 | 860 | * @data: user call data |
1da177e4 LT |
861 | */ |
862 | int | |
cbc20059 | 863 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 864 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
865 | { |
866 | struct rpc_task *task; | |
84115e1c TM |
867 | struct rpc_task_setup task_setup_data = { |
868 | .rpc_client = clnt, | |
869 | .rpc_message = msg, | |
870 | .callback_ops = tk_ops, | |
871 | .callback_data = data, | |
872 | .flags = flags|RPC_TASK_ASYNC, | |
873 | }; | |
1da177e4 | 874 | |
c970aa85 | 875 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
876 | if (IS_ERR(task)) |
877 | return PTR_ERR(task); | |
878 | rpc_put_task(task); | |
879 | return 0; | |
1da177e4 | 880 | } |
e8914c65 | 881 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 882 | |
9e00abc3 | 883 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
884 | /** |
885 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
886 | * rpc_execute against it | |
7a73fdde JSR |
887 | * @req: RPC request |
888 | * @tk_ops: RPC call ops | |
55ae1aab RL |
889 | */ |
890 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 891 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
892 | { |
893 | struct rpc_task *task; | |
894 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
895 | struct rpc_task_setup task_setup_data = { | |
896 | .callback_ops = tk_ops, | |
897 | }; | |
898 | ||
899 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
900 | /* | |
901 | * Create an rpc_task to send the data | |
902 | */ | |
903 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 904 | if (IS_ERR(task)) { |
55ae1aab RL |
905 | xprt_free_bc_request(req); |
906 | goto out; | |
907 | } | |
908 | task->tk_rqstp = req; | |
909 | ||
910 | /* | |
911 | * Set up the xdr_buf length. | |
912 | * This also indicates that the buffer is XDR encoded already. | |
913 | */ | |
914 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
915 | xbufp->tail[0].iov_len; | |
916 | ||
917 | task->tk_action = call_bc_transmit; | |
918 | atomic_inc(&task->tk_count); | |
9a6478f6 | 919 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
920 | rpc_execute(task); |
921 | ||
922 | out: | |
923 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
924 | return task; | |
925 | } | |
9e00abc3 | 926 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 927 | |
77de2c59 TM |
928 | void |
929 | rpc_call_start(struct rpc_task *task) | |
930 | { | |
931 | task->tk_action = call_start; | |
932 | } | |
933 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
934 | ||
ed39440a CL |
935 | /** |
936 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
937 | * @clnt: RPC client structure | |
938 | * @buf: target buffer | |
65b6e42c | 939 | * @bufsize: length of target buffer |
ed39440a CL |
940 | * |
941 | * Returns the number of bytes that are actually in the stored address. | |
942 | */ | |
943 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
944 | { | |
945 | size_t bytes; | |
2446ab60 TM |
946 | struct rpc_xprt *xprt; |
947 | ||
948 | rcu_read_lock(); | |
949 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 950 | |
2446ab60 | 951 | bytes = xprt->addrlen; |
ed39440a CL |
952 | if (bytes > bufsize) |
953 | bytes = bufsize; | |
2446ab60 TM |
954 | memcpy(buf, &xprt->addr, bytes); |
955 | rcu_read_unlock(); | |
956 | ||
957 | return bytes; | |
ed39440a | 958 | } |
b86acd50 | 959 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 960 | |
f425eba4 CL |
961 | /** |
962 | * rpc_peeraddr2str - return remote peer address in printable format | |
963 | * @clnt: RPC client structure | |
964 | * @format: address format | |
965 | * | |
2446ab60 TM |
966 | * NB: the lifetime of the memory referenced by the returned pointer is |
967 | * the same as the rpc_xprt itself. As long as the caller uses this | |
968 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 969 | */ |
b454ae90 CL |
970 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
971 | enum rpc_display_format_t format) | |
f425eba4 | 972 | { |
2446ab60 TM |
973 | struct rpc_xprt *xprt; |
974 | ||
975 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
976 | |
977 | if (xprt->address_strings[format] != NULL) | |
978 | return xprt->address_strings[format]; | |
979 | else | |
980 | return "unprintable"; | |
f425eba4 | 981 | } |
b86acd50 | 982 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 983 | |
2e738fdc CL |
984 | static const struct sockaddr_in rpc_inaddr_loopback = { |
985 | .sin_family = AF_INET, | |
986 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
987 | }; | |
988 | ||
989 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
990 | .sin6_family = AF_INET6, | |
991 | .sin6_addr = IN6ADDR_ANY_INIT, | |
992 | }; | |
993 | ||
994 | /* | |
995 | * Try a getsockname() on a connected datagram socket. Using a | |
996 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
997 | * This conserves the ephemeral port number space. | |
998 | * | |
999 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1000 | * negative errno is returned. | |
1001 | */ | |
1002 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
1003 | struct sockaddr *buf, int buflen) | |
1004 | { | |
1005 | struct socket *sock; | |
1006 | int err; | |
1007 | ||
1008 | err = __sock_create(net, sap->sa_family, | |
1009 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1010 | if (err < 0) { | |
1011 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1012 | goto out; | |
1013 | } | |
1014 | ||
1015 | switch (sap->sa_family) { | |
1016 | case AF_INET: | |
1017 | err = kernel_bind(sock, | |
1018 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1019 | sizeof(rpc_inaddr_loopback)); | |
1020 | break; | |
1021 | case AF_INET6: | |
1022 | err = kernel_bind(sock, | |
1023 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1024 | sizeof(rpc_in6addr_loopback)); | |
1025 | break; | |
1026 | default: | |
1027 | err = -EAFNOSUPPORT; | |
1028 | goto out; | |
1029 | } | |
1030 | if (err < 0) { | |
1031 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1032 | goto out_release; | |
1033 | } | |
1034 | ||
1035 | err = kernel_connect(sock, sap, salen, 0); | |
1036 | if (err < 0) { | |
1037 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1038 | goto out_release; | |
1039 | } | |
1040 | ||
1041 | err = kernel_getsockname(sock, buf, &buflen); | |
1042 | if (err < 0) { | |
1043 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1044 | goto out_release; | |
1045 | } | |
1046 | ||
1047 | err = 0; | |
1048 | if (buf->sa_family == AF_INET6) { | |
1049 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1050 | sin6->sin6_scope_id = 0; | |
1051 | } | |
1052 | dprintk("RPC: %s succeeded\n", __func__); | |
1053 | ||
1054 | out_release: | |
1055 | sock_release(sock); | |
1056 | out: | |
1057 | return err; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * Scraping a connected socket failed, so we don't have a useable | |
1062 | * local address. Fallback: generate an address that will prevent | |
1063 | * the server from calling us back. | |
1064 | * | |
1065 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1066 | * negative errno is returned. | |
1067 | */ | |
1068 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1069 | { | |
1070 | switch (family) { | |
1071 | case AF_INET: | |
1072 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1073 | return -EINVAL; | |
1074 | memcpy(buf, &rpc_inaddr_loopback, | |
1075 | sizeof(rpc_inaddr_loopback)); | |
1076 | break; | |
1077 | case AF_INET6: | |
1078 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1079 | return -EINVAL; | |
1080 | memcpy(buf, &rpc_in6addr_loopback, | |
1081 | sizeof(rpc_in6addr_loopback)); | |
1082 | default: | |
1083 | dprintk("RPC: %s: address family not supported\n", | |
1084 | __func__); | |
1085 | return -EAFNOSUPPORT; | |
1086 | } | |
1087 | dprintk("RPC: %s: succeeded\n", __func__); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | /** | |
1092 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1093 | * @clnt: RPC client structure | |
1094 | * @buf: target buffer | |
1095 | * @buflen: size of target buffer, in bytes | |
1096 | * | |
1097 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1098 | * otherwise, a negative errno is returned. | |
1099 | * | |
1100 | * This works even if the underlying transport is not currently connected, | |
1101 | * or if the upper layer never previously provided a source address. | |
1102 | * | |
1103 | * The result of this function call is transient: multiple calls in | |
1104 | * succession may give different results, depending on how local | |
1105 | * networking configuration changes over time. | |
1106 | */ | |
1107 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1108 | { | |
1109 | struct sockaddr_storage address; | |
1110 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1111 | struct rpc_xprt *xprt; | |
1112 | struct net *net; | |
1113 | size_t salen; | |
1114 | int err; | |
1115 | ||
1116 | rcu_read_lock(); | |
1117 | xprt = rcu_dereference(clnt->cl_xprt); | |
1118 | salen = xprt->addrlen; | |
1119 | memcpy(sap, &xprt->addr, salen); | |
1120 | net = get_net(xprt->xprt_net); | |
1121 | rcu_read_unlock(); | |
1122 | ||
1123 | rpc_set_port(sap, 0); | |
1124 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1125 | put_net(net); | |
1126 | if (err != 0) | |
1127 | /* Couldn't discover local address, return ANYADDR */ | |
1128 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1129 | return 0; | |
1130 | } | |
1131 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1132 | ||
1da177e4 LT |
1133 | void |
1134 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1135 | { | |
2446ab60 TM |
1136 | struct rpc_xprt *xprt; |
1137 | ||
1138 | rcu_read_lock(); | |
1139 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1140 | if (xprt->ops->set_buffer_size) |
1141 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1142 | rcu_read_unlock(); |
1da177e4 | 1143 | } |
e8914c65 | 1144 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1145 | |
2446ab60 TM |
1146 | /** |
1147 | * rpc_protocol - Get transport protocol number for an RPC client | |
1148 | * @clnt: RPC client to query | |
1149 | * | |
1150 | */ | |
1151 | int rpc_protocol(struct rpc_clnt *clnt) | |
1152 | { | |
1153 | int protocol; | |
1154 | ||
1155 | rcu_read_lock(); | |
1156 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1157 | rcu_read_unlock(); | |
1158 | return protocol; | |
1159 | } | |
1160 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1161 | ||
1162 | /** | |
1163 | * rpc_net_ns - Get the network namespace for this RPC client | |
1164 | * @clnt: RPC client to query | |
1165 | * | |
1166 | */ | |
1167 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1168 | { | |
1169 | struct net *ret; | |
1170 | ||
1171 | rcu_read_lock(); | |
1172 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1173 | rcu_read_unlock(); | |
1174 | return ret; | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1177 | ||
1178 | /** | |
1179 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1180 | * @clnt: RPC client to query | |
1da177e4 LT |
1181 | * |
1182 | * For stream transports, this is one RPC record fragment (see RFC | |
1183 | * 1831), as we don't support multi-record requests yet. For datagram | |
1184 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1185 | * RPC header sizes. | |
1186 | */ | |
1187 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1188 | { | |
2446ab60 TM |
1189 | size_t ret; |
1190 | ||
1191 | rcu_read_lock(); | |
1192 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1193 | rcu_read_unlock(); | |
1194 | return ret; | |
1da177e4 | 1195 | } |
b86acd50 | 1196 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1197 | |
edddbb1e | 1198 | /** |
512e4b29 | 1199 | * rpc_get_timeout - Get timeout for transport in units of HZ |
edddbb1e WAA |
1200 | * @clnt: RPC client to query |
1201 | */ | |
1202 | unsigned long rpc_get_timeout(struct rpc_clnt *clnt) | |
1203 | { | |
1204 | unsigned long ret; | |
1205 | ||
1206 | rcu_read_lock(); | |
1207 | ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval; | |
1208 | rcu_read_unlock(); | |
1209 | return ret; | |
1210 | } | |
1211 | EXPORT_SYMBOL_GPL(rpc_get_timeout); | |
1212 | ||
35f5a422 CL |
1213 | /** |
1214 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1215 | * @clnt: client to rebind | |
1216 | * | |
1217 | */ | |
1218 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1219 | { | |
2446ab60 TM |
1220 | if (clnt->cl_autobind) { |
1221 | rcu_read_lock(); | |
1222 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1223 | rcu_read_unlock(); | |
1224 | } | |
35f5a422 | 1225 | } |
b86acd50 | 1226 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1227 | |
aae2006e AA |
1228 | /* |
1229 | * Restart an (async) RPC call from the call_prepare state. | |
1230 | * Usually called from within the exit handler. | |
1231 | */ | |
f1f88fc7 | 1232 | int |
aae2006e AA |
1233 | rpc_restart_call_prepare(struct rpc_task *task) |
1234 | { | |
1235 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1236 | return 0; |
d00c5d43 TM |
1237 | task->tk_action = call_start; |
1238 | if (task->tk_ops->rpc_call_prepare != NULL) | |
1239 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1240 | return 1; |
aae2006e AA |
1241 | } |
1242 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1243 | ||
1da177e4 LT |
1244 | /* |
1245 | * Restart an (async) RPC call. Usually called from within the | |
1246 | * exit handler. | |
1247 | */ | |
f1f88fc7 | 1248 | int |
1da177e4 LT |
1249 | rpc_restart_call(struct rpc_task *task) |
1250 | { | |
1251 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1252 | return 0; |
1da177e4 | 1253 | task->tk_action = call_start; |
f1f88fc7 | 1254 | return 1; |
1da177e4 | 1255 | } |
e8914c65 | 1256 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1257 | |
3748f1e4 CL |
1258 | #ifdef RPC_DEBUG |
1259 | static const char *rpc_proc_name(const struct rpc_task *task) | |
1260 | { | |
1261 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1262 | ||
1263 | if (proc) { | |
1264 | if (proc->p_name) | |
1265 | return proc->p_name; | |
1266 | else | |
1267 | return "NULL"; | |
1268 | } else | |
1269 | return "no proc"; | |
1270 | } | |
1271 | #endif | |
1272 | ||
1da177e4 LT |
1273 | /* |
1274 | * 0. Initial state | |
1275 | * | |
1276 | * Other FSM states can be visited zero or more times, but | |
1277 | * this state is visited exactly once for each RPC. | |
1278 | */ | |
1279 | static void | |
1280 | call_start(struct rpc_task *task) | |
1281 | { | |
1282 | struct rpc_clnt *clnt = task->tk_client; | |
1283 | ||
3748f1e4 | 1284 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
55909f21 | 1285 | clnt->cl_program->name, clnt->cl_vers, |
3748f1e4 | 1286 | rpc_proc_name(task), |
46121cf7 | 1287 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1288 | |
1289 | /* Increment call count */ | |
1290 | task->tk_msg.rpc_proc->p_count++; | |
1291 | clnt->cl_stats->rpccnt++; | |
1292 | task->tk_action = call_reserve; | |
1293 | } | |
1294 | ||
1295 | /* | |
1296 | * 1. Reserve an RPC call slot | |
1297 | */ | |
1298 | static void | |
1299 | call_reserve(struct rpc_task *task) | |
1300 | { | |
46121cf7 | 1301 | dprint_status(task); |
1da177e4 | 1302 | |
1da177e4 LT |
1303 | task->tk_status = 0; |
1304 | task->tk_action = call_reserveresult; | |
1305 | xprt_reserve(task); | |
1306 | } | |
1307 | ||
ba60eb25 TM |
1308 | static void call_retry_reserve(struct rpc_task *task); |
1309 | ||
1da177e4 LT |
1310 | /* |
1311 | * 1b. Grok the result of xprt_reserve() | |
1312 | */ | |
1313 | static void | |
1314 | call_reserveresult(struct rpc_task *task) | |
1315 | { | |
1316 | int status = task->tk_status; | |
1317 | ||
46121cf7 | 1318 | dprint_status(task); |
1da177e4 LT |
1319 | |
1320 | /* | |
1321 | * After a call to xprt_reserve(), we must have either | |
1322 | * a request slot or else an error status. | |
1323 | */ | |
1324 | task->tk_status = 0; | |
1325 | if (status >= 0) { | |
1326 | if (task->tk_rqstp) { | |
f2d47d02 | 1327 | task->tk_action = call_refresh; |
1da177e4 LT |
1328 | return; |
1329 | } | |
1330 | ||
1331 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1332 | __func__, status); |
1da177e4 LT |
1333 | rpc_exit(task, -EIO); |
1334 | return; | |
1335 | } | |
1336 | ||
1337 | /* | |
1338 | * Even though there was an error, we may have acquired | |
1339 | * a request slot somehow. Make sure not to leak it. | |
1340 | */ | |
1341 | if (task->tk_rqstp) { | |
1342 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1343 | __func__, status); |
1da177e4 LT |
1344 | xprt_release(task); |
1345 | } | |
1346 | ||
1347 | switch (status) { | |
1afeaf5c TM |
1348 | case -ENOMEM: |
1349 | rpc_delay(task, HZ >> 2); | |
1da177e4 | 1350 | case -EAGAIN: /* woken up; retry */ |
ba60eb25 | 1351 | task->tk_action = call_retry_reserve; |
1da177e4 LT |
1352 | return; |
1353 | case -EIO: /* probably a shutdown */ | |
1354 | break; | |
1355 | default: | |
1356 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1357 | __func__, status); |
1da177e4 LT |
1358 | break; |
1359 | } | |
1360 | rpc_exit(task, status); | |
1361 | } | |
1362 | ||
ba60eb25 TM |
1363 | /* |
1364 | * 1c. Retry reserving an RPC call slot | |
1365 | */ | |
1366 | static void | |
1367 | call_retry_reserve(struct rpc_task *task) | |
1368 | { | |
1369 | dprint_status(task); | |
1370 | ||
1371 | task->tk_status = 0; | |
1372 | task->tk_action = call_reserveresult; | |
1373 | xprt_retry_reserve(task); | |
1374 | } | |
1375 | ||
1da177e4 | 1376 | /* |
55576244 BF |
1377 | * 2. Bind and/or refresh the credentials |
1378 | */ | |
1379 | static void | |
1380 | call_refresh(struct rpc_task *task) | |
1381 | { | |
1382 | dprint_status(task); | |
1383 | ||
1384 | task->tk_action = call_refreshresult; | |
1385 | task->tk_status = 0; | |
1386 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1387 | rpcauth_refreshcred(task); | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * 2a. Process the results of a credential refresh | |
1392 | */ | |
1393 | static void | |
1394 | call_refreshresult(struct rpc_task *task) | |
1395 | { | |
1396 | int status = task->tk_status; | |
1397 | ||
1398 | dprint_status(task); | |
1399 | ||
1400 | task->tk_status = 0; | |
5fc43978 | 1401 | task->tk_action = call_refresh; |
55576244 | 1402 | switch (status) { |
5fc43978 TM |
1403 | case 0: |
1404 | if (rpcauth_uptodatecred(task)) | |
1405 | task->tk_action = call_allocate; | |
55576244 BF |
1406 | return; |
1407 | case -ETIMEDOUT: | |
1408 | rpc_delay(task, 3*HZ); | |
eb96d5c9 | 1409 | case -EKEYEXPIRED: |
5fc43978 TM |
1410 | case -EAGAIN: |
1411 | status = -EACCES; | |
1412 | if (!task->tk_cred_retry) | |
1413 | break; | |
1414 | task->tk_cred_retry--; | |
1415 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1416 | task->tk_pid, __func__); | |
1417 | return; | |
55576244 | 1418 | } |
5fc43978 TM |
1419 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1420 | task->tk_pid, __func__, status); | |
1421 | rpc_exit(task, status); | |
55576244 BF |
1422 | } |
1423 | ||
1424 | /* | |
1425 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1426 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1427 | */ |
1428 | static void | |
1429 | call_allocate(struct rpc_task *task) | |
1430 | { | |
f2d47d02 | 1431 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 | 1432 | struct rpc_rqst *req = task->tk_rqstp; |
a4f0835c | 1433 | struct rpc_xprt *xprt = req->rq_xprt; |
2bea90d4 | 1434 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1435 | |
46121cf7 CL |
1436 | dprint_status(task); |
1437 | ||
2bea90d4 | 1438 | task->tk_status = 0; |
f2d47d02 | 1439 | task->tk_action = call_bind; |
2bea90d4 | 1440 | |
02107148 | 1441 | if (req->rq_buffer) |
1da177e4 LT |
1442 | return; |
1443 | ||
2bea90d4 CL |
1444 | if (proc->p_proc != 0) { |
1445 | BUG_ON(proc->p_arglen == 0); | |
1446 | if (proc->p_decode != NULL) | |
1447 | BUG_ON(proc->p_replen == 0); | |
1448 | } | |
1da177e4 | 1449 | |
2bea90d4 CL |
1450 | /* |
1451 | * Calculate the size (in quads) of the RPC call | |
1452 | * and reply headers, and convert both values | |
1453 | * to byte sizes. | |
1454 | */ | |
1455 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1456 | req->rq_callsize <<= 2; | |
1457 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1458 | req->rq_rcvsize <<= 2; | |
1459 | ||
c5a4dd8b CL |
1460 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1461 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1462 | if (req->rq_buffer != NULL) |
1da177e4 | 1463 | return; |
46121cf7 CL |
1464 | |
1465 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1466 | |
5afa9133 | 1467 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1468 | task->tk_action = call_allocate; |
1da177e4 LT |
1469 | rpc_delay(task, HZ>>4); |
1470 | return; | |
1471 | } | |
1472 | ||
1473 | rpc_exit(task, -ERESTARTSYS); | |
1474 | } | |
1475 | ||
940e3318 TM |
1476 | static inline int |
1477 | rpc_task_need_encode(struct rpc_task *task) | |
1478 | { | |
1479 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1480 | } | |
1481 | ||
1482 | static inline void | |
1483 | rpc_task_force_reencode(struct rpc_task *task) | |
1484 | { | |
1485 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1486 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1487 | } |
1488 | ||
2bea90d4 CL |
1489 | static inline void |
1490 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1491 | { | |
1492 | buf->head[0].iov_base = start; | |
1493 | buf->head[0].iov_len = len; | |
1494 | buf->tail[0].iov_len = 0; | |
1495 | buf->page_len = 0; | |
4f22ccc3 | 1496 | buf->flags = 0; |
2bea90d4 CL |
1497 | buf->len = 0; |
1498 | buf->buflen = len; | |
1499 | } | |
1500 | ||
1da177e4 LT |
1501 | /* |
1502 | * 3. Encode arguments of an RPC call | |
1503 | */ | |
1504 | static void | |
b0e1c57e | 1505 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1506 | { |
1da177e4 | 1507 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1508 | kxdreproc_t encode; |
d8ed029d | 1509 | __be32 *p; |
1da177e4 | 1510 | |
46121cf7 | 1511 | dprint_status(task); |
1da177e4 | 1512 | |
2bea90d4 CL |
1513 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1514 | req->rq_buffer, | |
1515 | req->rq_callsize); | |
1516 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1517 | (char *)req->rq_buffer + req->rq_callsize, | |
1518 | req->rq_rcvsize); | |
1da177e4 | 1519 | |
b0e1c57e CL |
1520 | p = rpc_encode_header(task); |
1521 | if (p == NULL) { | |
1522 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1523 | rpc_exit(task, -EIO); |
1524 | return; | |
1525 | } | |
b0e1c57e CL |
1526 | |
1527 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1528 | if (encode == NULL) |
1529 | return; | |
1530 | ||
1531 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1532 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | /* | |
1536 | * 4. Get the server port number if not yet set | |
1537 | */ | |
1538 | static void | |
1539 | call_bind(struct rpc_task *task) | |
1540 | { | |
ad2368d6 | 1541 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1542 | |
46121cf7 | 1543 | dprint_status(task); |
1da177e4 | 1544 | |
da351878 | 1545 | task->tk_action = call_connect; |
ec739ef0 | 1546 | if (!xprt_bound(xprt)) { |
da351878 | 1547 | task->tk_action = call_bind_status; |
ec739ef0 | 1548 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1549 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1550 | } |
1551 | } | |
1552 | ||
1553 | /* | |
da351878 CL |
1554 | * 4a. Sort out bind result |
1555 | */ | |
1556 | static void | |
1557 | call_bind_status(struct rpc_task *task) | |
1558 | { | |
906462af | 1559 | int status = -EIO; |
da351878 CL |
1560 | |
1561 | if (task->tk_status >= 0) { | |
46121cf7 | 1562 | dprint_status(task); |
da351878 CL |
1563 | task->tk_status = 0; |
1564 | task->tk_action = call_connect; | |
1565 | return; | |
1566 | } | |
1567 | ||
5753cba1 | 1568 | trace_rpc_bind_status(task); |
da351878 | 1569 | switch (task->tk_status) { |
381ba74a TM |
1570 | case -ENOMEM: |
1571 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1572 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1573 | goto retry_timeout; |
da351878 | 1574 | case -EACCES: |
46121cf7 CL |
1575 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1576 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1577 | /* fail immediately if this is an RPC ping */ |
1578 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1579 | status = -EOPNOTSUPP; | |
1580 | break; | |
1581 | } | |
0b760113 TM |
1582 | if (task->tk_rebind_retry == 0) |
1583 | break; | |
1584 | task->tk_rebind_retry--; | |
ea635a51 | 1585 | rpc_delay(task, 3*HZ); |
da45828e | 1586 | goto retry_timeout; |
da351878 | 1587 | case -ETIMEDOUT: |
46121cf7 | 1588 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1589 | task->tk_pid); |
da45828e | 1590 | goto retry_timeout; |
da351878 | 1591 | case -EPFNOSUPPORT: |
906462af | 1592 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1593 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1594 | task->tk_pid); |
1595 | break; | |
1596 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1597 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1598 | task->tk_pid); |
00a6e7bb CL |
1599 | task->tk_status = 0; |
1600 | task->tk_action = call_bind; | |
1601 | return; | |
012da158 CL |
1602 | case -ECONNREFUSED: /* connection problems */ |
1603 | case -ECONNRESET: | |
1604 | case -ENOTCONN: | |
1605 | case -EHOSTDOWN: | |
1606 | case -EHOSTUNREACH: | |
1607 | case -ENETUNREACH: | |
1608 | case -EPIPE: | |
1609 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1610 | task->tk_pid, task->tk_status); | |
1611 | if (!RPC_IS_SOFTCONN(task)) { | |
1612 | rpc_delay(task, 5*HZ); | |
1613 | goto retry_timeout; | |
1614 | } | |
1615 | status = task->tk_status; | |
1616 | break; | |
da351878 | 1617 | default: |
46121cf7 | 1618 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1619 | task->tk_pid, -task->tk_status); |
da351878 CL |
1620 | } |
1621 | ||
1622 | rpc_exit(task, status); | |
1623 | return; | |
1624 | ||
da45828e TM |
1625 | retry_timeout: |
1626 | task->tk_action = call_timeout; | |
da351878 CL |
1627 | } |
1628 | ||
1629 | /* | |
1630 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1631 | */ |
1632 | static void | |
1633 | call_connect(struct rpc_task *task) | |
1634 | { | |
ad2368d6 | 1635 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1636 | |
46121cf7 | 1637 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1638 | task->tk_pid, xprt, |
1639 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1640 | |
da351878 CL |
1641 | task->tk_action = call_transmit; |
1642 | if (!xprt_connected(xprt)) { | |
1643 | task->tk_action = call_connect_status; | |
1644 | if (task->tk_status < 0) | |
1645 | return; | |
1646 | xprt_connect(task); | |
1da177e4 | 1647 | } |
1da177e4 LT |
1648 | } |
1649 | ||
1650 | /* | |
da351878 | 1651 | * 4c. Sort out connect result |
1da177e4 LT |
1652 | */ |
1653 | static void | |
1654 | call_connect_status(struct rpc_task *task) | |
1655 | { | |
1656 | struct rpc_clnt *clnt = task->tk_client; | |
1657 | int status = task->tk_status; | |
1658 | ||
46121cf7 | 1659 | dprint_status(task); |
da351878 | 1660 | |
5753cba1 | 1661 | trace_rpc_connect_status(task, status); |
1da177e4 | 1662 | switch (status) { |
da45828e TM |
1663 | /* if soft mounted, test if we've timed out */ |
1664 | case -ETIMEDOUT: | |
1665 | task->tk_action = call_timeout; | |
3ed5e2a2 TM |
1666 | return; |
1667 | case -ECONNREFUSED: | |
1668 | case -ECONNRESET: | |
1669 | case -ENETUNREACH: | |
1670 | if (RPC_IS_SOFTCONN(task)) | |
1671 | break; | |
1672 | /* retry with existing socket, after a delay */ | |
1673 | case 0: | |
1674 | case -EAGAIN: | |
1675 | task->tk_status = 0; | |
1676 | clnt->cl_stats->netreconn++; | |
1677 | task->tk_action = call_transmit; | |
1678 | return; | |
1da177e4 | 1679 | } |
3ed5e2a2 | 1680 | rpc_exit(task, status); |
1da177e4 LT |
1681 | } |
1682 | ||
1683 | /* | |
1684 | * 5. Transmit the RPC request, and wait for reply | |
1685 | */ | |
1686 | static void | |
1687 | call_transmit(struct rpc_task *task) | |
1688 | { | |
46121cf7 | 1689 | dprint_status(task); |
1da177e4 LT |
1690 | |
1691 | task->tk_action = call_status; | |
1692 | if (task->tk_status < 0) | |
1693 | return; | |
1694 | task->tk_status = xprt_prepare_transmit(task); | |
1695 | if (task->tk_status != 0) | |
1696 | return; | |
e0ab53de | 1697 | task->tk_action = call_transmit_status; |
1da177e4 | 1698 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1699 | if (rpc_task_need_encode(task)) { |
b0e1c57e | 1700 | rpc_xdr_encode(task); |
5e5ce5be | 1701 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1702 | if (task->tk_status != 0) { |
1703 | /* Was the error nonfatal? */ | |
1704 | if (task->tk_status == -EAGAIN) | |
1705 | rpc_delay(task, HZ >> 4); | |
1706 | else | |
1707 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1708 | return; |
8b39f2b4 | 1709 | } |
5e5ce5be | 1710 | } |
1da177e4 LT |
1711 | xprt_transmit(task); |
1712 | if (task->tk_status < 0) | |
1713 | return; | |
e0ab53de TM |
1714 | /* |
1715 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1716 | * in order to allow access to the socket to other RPC requests. | |
1717 | */ | |
1718 | call_transmit_status(task); | |
55ae1aab | 1719 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1720 | return; |
1721 | task->tk_action = rpc_exit_task; | |
a4f0835c | 1722 | rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task); |
e0ab53de TM |
1723 | } |
1724 | ||
1725 | /* | |
1726 | * 5a. Handle cleanup after a transmission | |
1727 | */ | |
1728 | static void | |
1729 | call_transmit_status(struct rpc_task *task) | |
1730 | { | |
1731 | task->tk_action = call_status; | |
206a134b CL |
1732 | |
1733 | /* | |
1734 | * Common case: success. Force the compiler to put this | |
1735 | * test first. | |
1736 | */ | |
1737 | if (task->tk_status == 0) { | |
1738 | xprt_end_transmit(task); | |
1739 | rpc_task_force_reencode(task); | |
1740 | return; | |
1741 | } | |
1742 | ||
15f081ca TM |
1743 | switch (task->tk_status) { |
1744 | case -EAGAIN: | |
1745 | break; | |
1746 | default: | |
206a134b | 1747 | dprint_status(task); |
15f081ca | 1748 | xprt_end_transmit(task); |
09a21c41 CL |
1749 | rpc_task_force_reencode(task); |
1750 | break; | |
15f081ca TM |
1751 | /* |
1752 | * Special cases: if we've been waiting on the | |
1753 | * socket's write_space() callback, or if the | |
1754 | * socket just returned a connection error, | |
1755 | * then hold onto the transport lock. | |
1756 | */ | |
1757 | case -ECONNREFUSED: | |
15f081ca TM |
1758 | case -EHOSTDOWN: |
1759 | case -EHOSTUNREACH: | |
1760 | case -ENETUNREACH: | |
09a21c41 CL |
1761 | if (RPC_IS_SOFTCONN(task)) { |
1762 | xprt_end_transmit(task); | |
1763 | rpc_exit(task, task->tk_status); | |
1764 | break; | |
1765 | } | |
1766 | case -ECONNRESET: | |
1767 | case -ENOTCONN: | |
c8485e4d | 1768 | case -EPIPE: |
15f081ca TM |
1769 | rpc_task_force_reencode(task); |
1770 | } | |
1da177e4 LT |
1771 | } |
1772 | ||
9e00abc3 | 1773 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1774 | /* |
1775 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1776 | * addition, disconnect on connectivity errors. | |
1777 | */ | |
1778 | static void | |
1779 | call_bc_transmit(struct rpc_task *task) | |
1780 | { | |
1781 | struct rpc_rqst *req = task->tk_rqstp; | |
1782 | ||
55ae1aab RL |
1783 | task->tk_status = xprt_prepare_transmit(task); |
1784 | if (task->tk_status == -EAGAIN) { | |
1785 | /* | |
1786 | * Could not reserve the transport. Try again after the | |
1787 | * transport is released. | |
1788 | */ | |
1789 | task->tk_status = 0; | |
1790 | task->tk_action = call_bc_transmit; | |
1791 | return; | |
1792 | } | |
1793 | ||
1794 | task->tk_action = rpc_exit_task; | |
1795 | if (task->tk_status < 0) { | |
1796 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1797 | "error: %d\n", task->tk_status); | |
1798 | return; | |
1799 | } | |
1800 | ||
1801 | xprt_transmit(task); | |
1802 | xprt_end_transmit(task); | |
1803 | dprint_status(task); | |
1804 | switch (task->tk_status) { | |
1805 | case 0: | |
1806 | /* Success */ | |
1807 | break; | |
1808 | case -EHOSTDOWN: | |
1809 | case -EHOSTUNREACH: | |
1810 | case -ENETUNREACH: | |
1811 | case -ETIMEDOUT: | |
1812 | /* | |
1813 | * Problem reaching the server. Disconnect and let the | |
1814 | * forechannel reestablish the connection. The server will | |
1815 | * have to retransmit the backchannel request and we'll | |
1816 | * reprocess it. Since these ops are idempotent, there's no | |
1817 | * need to cache our reply at this time. | |
1818 | */ | |
1819 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1820 | "error: %d\n", task->tk_status); | |
a4f0835c | 1821 | xprt_conditional_disconnect(req->rq_xprt, |
55ae1aab RL |
1822 | req->rq_connect_cookie); |
1823 | break; | |
1824 | default: | |
1825 | /* | |
1826 | * We were unable to reply and will have to drop the | |
1827 | * request. The server should reconnect and retransmit. | |
1828 | */ | |
1facf4c4 | 1829 | WARN_ON_ONCE(task->tk_status == -EAGAIN); |
55ae1aab RL |
1830 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1831 | "error: %d\n", task->tk_status); | |
1832 | break; | |
1833 | } | |
1834 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1835 | } | |
9e00abc3 | 1836 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1837 | |
1da177e4 LT |
1838 | /* |
1839 | * 6. Sort out the RPC call status | |
1840 | */ | |
1841 | static void | |
1842 | call_status(struct rpc_task *task) | |
1843 | { | |
1844 | struct rpc_clnt *clnt = task->tk_client; | |
1845 | struct rpc_rqst *req = task->tk_rqstp; | |
1846 | int status; | |
1847 | ||
dd2b63d0 RL |
1848 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1849 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1850 | |
46121cf7 | 1851 | dprint_status(task); |
1da177e4 LT |
1852 | |
1853 | status = task->tk_status; | |
1854 | if (status >= 0) { | |
1855 | task->tk_action = call_decode; | |
1856 | return; | |
1857 | } | |
1858 | ||
5753cba1 | 1859 | trace_rpc_call_status(task); |
1da177e4 LT |
1860 | task->tk_status = 0; |
1861 | switch(status) { | |
76303992 TM |
1862 | case -EHOSTDOWN: |
1863 | case -EHOSTUNREACH: | |
1864 | case -ENETUNREACH: | |
1865 | /* | |
1866 | * Delay any retries for 3 seconds, then handle as if it | |
1867 | * were a timeout. | |
1868 | */ | |
1869 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1870 | case -ETIMEDOUT: |
1871 | task->tk_action = call_timeout; | |
241c39b9 | 1872 | if (task->tk_client->cl_discrtry) |
a4f0835c | 1873 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 1874 | req->rq_connect_cookie); |
1da177e4 | 1875 | break; |
c8485e4d | 1876 | case -ECONNRESET: |
1da177e4 | 1877 | case -ECONNREFUSED: |
35f5a422 | 1878 | rpc_force_rebind(clnt); |
c8485e4d TM |
1879 | rpc_delay(task, 3*HZ); |
1880 | case -EPIPE: | |
1881 | case -ENOTCONN: | |
1da177e4 LT |
1882 | task->tk_action = call_bind; |
1883 | break; | |
1884 | case -EAGAIN: | |
1885 | task->tk_action = call_transmit; | |
1886 | break; | |
1887 | case -EIO: | |
1888 | /* shutdown or soft timeout */ | |
1889 | rpc_exit(task, status); | |
1890 | break; | |
1891 | default: | |
b6b6152c OK |
1892 | if (clnt->cl_chatty) |
1893 | printk("%s: RPC call returned error %d\n", | |
55909f21 | 1894 | clnt->cl_program->name, -status); |
1da177e4 | 1895 | rpc_exit(task, status); |
1da177e4 LT |
1896 | } |
1897 | } | |
1898 | ||
1899 | /* | |
e0ab53de | 1900 | * 6a. Handle RPC timeout |
1da177e4 LT |
1901 | * We do not release the request slot, so we keep using the |
1902 | * same XID for all retransmits. | |
1903 | */ | |
1904 | static void | |
1905 | call_timeout(struct rpc_task *task) | |
1906 | { | |
1907 | struct rpc_clnt *clnt = task->tk_client; | |
1908 | ||
1909 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1910 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1911 | goto retry; |
1912 | } | |
1913 | ||
46121cf7 | 1914 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1915 | task->tk_timeouts++; |
1916 | ||
3a28becc CL |
1917 | if (RPC_IS_SOFTCONN(task)) { |
1918 | rpc_exit(task, -ETIMEDOUT); | |
1919 | return; | |
1920 | } | |
1da177e4 | 1921 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 1922 | if (clnt->cl_chatty) { |
4e0038b6 | 1923 | rcu_read_lock(); |
b6b6152c | 1924 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
55909f21 | 1925 | clnt->cl_program->name, |
4e0038b6 TM |
1926 | rcu_dereference(clnt->cl_xprt)->servername); |
1927 | rcu_read_unlock(); | |
cac5d07e | 1928 | } |
7494d00c TM |
1929 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
1930 | rpc_exit(task, -ETIMEDOUT); | |
1931 | else | |
1932 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1933 | return; |
1934 | } | |
1935 | ||
f518e35a | 1936 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1937 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
1938 | if (clnt->cl_chatty) { |
1939 | rcu_read_lock(); | |
b6b6152c | 1940 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
55909f21 | 1941 | clnt->cl_program->name, |
4e0038b6 TM |
1942 | rcu_dereference(clnt->cl_xprt)->servername); |
1943 | rcu_read_unlock(); | |
1944 | } | |
1da177e4 | 1945 | } |
35f5a422 | 1946 | rpc_force_rebind(clnt); |
b48633bd TM |
1947 | /* |
1948 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1949 | * event? RFC2203 requires the server to drop all such requests. | |
1950 | */ | |
1951 | rpcauth_invalcred(task); | |
1da177e4 LT |
1952 | |
1953 | retry: | |
1954 | clnt->cl_stats->rpcretrans++; | |
1955 | task->tk_action = call_bind; | |
1956 | task->tk_status = 0; | |
1957 | } | |
1958 | ||
1959 | /* | |
1960 | * 7. Decode the RPC reply | |
1961 | */ | |
1962 | static void | |
1963 | call_decode(struct rpc_task *task) | |
1964 | { | |
1965 | struct rpc_clnt *clnt = task->tk_client; | |
1966 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 1967 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 1968 | __be32 *p; |
1da177e4 | 1969 | |
726fd6ad | 1970 | dprint_status(task); |
1da177e4 | 1971 | |
f518e35a | 1972 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
1973 | if (clnt->cl_chatty) { |
1974 | rcu_read_lock(); | |
b6b6152c | 1975 | printk(KERN_NOTICE "%s: server %s OK\n", |
55909f21 | 1976 | clnt->cl_program->name, |
4e0038b6 TM |
1977 | rcu_dereference(clnt->cl_xprt)->servername); |
1978 | rcu_read_unlock(); | |
1979 | } | |
1da177e4 LT |
1980 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1981 | } | |
1982 | ||
43ac3f29 TM |
1983 | /* |
1984 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 1985 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
1986 | */ |
1987 | smp_rmb(); | |
1da177e4 LT |
1988 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1989 | ||
1990 | /* Check that the softirq receive buffer is valid */ | |
1991 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1992 | sizeof(req->rq_rcv_buf)) != 0); | |
1993 | ||
1e799b67 TM |
1994 | if (req->rq_rcv_buf.len < 12) { |
1995 | if (!RPC_IS_SOFT(task)) { | |
1996 | task->tk_action = call_bind; | |
1997 | clnt->cl_stats->rpcretrans++; | |
1998 | goto out_retry; | |
1999 | } | |
2000 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
55909f21 | 2001 | clnt->cl_program->name, task->tk_status); |
1e799b67 TM |
2002 | task->tk_action = call_timeout; |
2003 | goto out_retry; | |
2004 | } | |
2005 | ||
b0e1c57e | 2006 | p = rpc_verify_header(task); |
abbcf28f TM |
2007 | if (IS_ERR(p)) { |
2008 | if (p == ERR_PTR(-EAGAIN)) | |
2009 | goto out_retry; | |
2010 | return; | |
1da177e4 LT |
2011 | } |
2012 | ||
abbcf28f | 2013 | task->tk_action = rpc_exit_task; |
1da177e4 | 2014 | |
6d5fcb5a | 2015 | if (decode) { |
1da177e4 LT |
2016 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
2017 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 2018 | } |
46121cf7 CL |
2019 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
2020 | task->tk_status); | |
1da177e4 LT |
2021 | return; |
2022 | out_retry: | |
1da177e4 | 2023 | task->tk_status = 0; |
b0e1c57e | 2024 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 2025 | if (task->tk_rqstp == req) { |
dd2b63d0 | 2026 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 2027 | if (task->tk_client->cl_discrtry) |
a4f0835c | 2028 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2029 | req->rq_connect_cookie); |
24b74bf0 | 2030 | } |
1da177e4 LT |
2031 | } |
2032 | ||
d8ed029d | 2033 | static __be32 * |
b0e1c57e | 2034 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
2035 | { |
2036 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2037 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 2038 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
2039 | |
2040 | /* FIXME: check buffer size? */ | |
808012fb | 2041 | |
a4f0835c | 2042 | p = xprt_skip_transport_header(req->rq_xprt, p); |
1da177e4 LT |
2043 | *p++ = req->rq_xid; /* XID */ |
2044 | *p++ = htonl(RPC_CALL); /* CALL */ | |
2045 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
2046 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
2047 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
2048 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
2049 | p = rpcauth_marshcred(task, p); |
2050 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
2051 | return p; | |
1da177e4 LT |
2052 | } |
2053 | ||
d8ed029d | 2054 | static __be32 * |
b0e1c57e | 2055 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 2056 | { |
4e0038b6 | 2057 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
2058 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
2059 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
2060 | __be32 *p = iov->iov_base; |
2061 | u32 n; | |
1da177e4 LT |
2062 | int error = -EACCES; |
2063 | ||
e8896495 DH |
2064 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
2065 | /* RFC-1014 says that the representation of XDR data must be a | |
2066 | * multiple of four bytes | |
2067 | * - if it isn't pointer subtraction in the NFS client may give | |
2068 | * undefined results | |
2069 | */ | |
8a702bbb | 2070 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2071 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2072 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
2073 | goto out_eio; |
2074 | } | |
1da177e4 LT |
2075 | if ((len -= 3) < 0) |
2076 | goto out_overflow; | |
1da177e4 | 2077 | |
f4a2e418 | 2078 | p += 1; /* skip XID */ |
1da177e4 | 2079 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2080 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2081 | task->tk_pid, __func__, n); |
abbcf28f | 2082 | goto out_garbage; |
1da177e4 | 2083 | } |
f4a2e418 | 2084 | |
1da177e4 LT |
2085 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2086 | if (--len < 0) | |
2087 | goto out_overflow; | |
2088 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2089 | case RPC_AUTH_ERROR: |
2090 | break; | |
2091 | case RPC_MISMATCH: | |
2092 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2093 | task->tk_pid, __func__); | |
2094 | error = -EPROTONOSUPPORT; | |
2095 | goto out_err; | |
2096 | default: | |
2097 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2098 | "unknown error: %x\n", | |
2099 | task->tk_pid, __func__, n); | |
2100 | goto out_eio; | |
1da177e4 LT |
2101 | } |
2102 | if (--len < 0) | |
2103 | goto out_overflow; | |
2104 | switch ((n = ntohl(*p++))) { | |
2105 | case RPC_AUTH_REJECTEDCRED: | |
2106 | case RPC_AUTH_REJECTEDVERF: | |
2107 | case RPCSEC_GSS_CREDPROBLEM: | |
2108 | case RPCSEC_GSS_CTXPROBLEM: | |
2109 | if (!task->tk_cred_retry) | |
2110 | break; | |
2111 | task->tk_cred_retry--; | |
46121cf7 | 2112 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2113 | task->tk_pid, __func__); |
1da177e4 | 2114 | rpcauth_invalcred(task); |
220bcc2a TM |
2115 | /* Ensure we obtain a new XID! */ |
2116 | xprt_release(task); | |
118df3d1 | 2117 | task->tk_action = call_reserve; |
abbcf28f | 2118 | goto out_retry; |
1da177e4 LT |
2119 | case RPC_AUTH_BADCRED: |
2120 | case RPC_AUTH_BADVERF: | |
2121 | /* possibly garbled cred/verf? */ | |
2122 | if (!task->tk_garb_retry) | |
2123 | break; | |
2124 | task->tk_garb_retry--; | |
46121cf7 | 2125 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2126 | task->tk_pid, __func__); |
1da177e4 | 2127 | task->tk_action = call_bind; |
abbcf28f | 2128 | goto out_retry; |
1da177e4 | 2129 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2130 | rcu_read_lock(); |
b0e1c57e | 2131 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2132 | "authentication.\n", |
2133 | rcu_dereference(clnt->cl_xprt)->servername); | |
2134 | rcu_read_unlock(); | |
1da177e4 LT |
2135 | break; |
2136 | default: | |
8a702bbb | 2137 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2138 | task->tk_pid, __func__, n); |
1da177e4 LT |
2139 | error = -EIO; |
2140 | } | |
46121cf7 | 2141 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2142 | task->tk_pid, __func__, n); |
1da177e4 LT |
2143 | goto out_err; |
2144 | } | |
2145 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 2146 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 2147 | task->tk_pid, __func__); |
abbcf28f | 2148 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2149 | } |
d8ed029d | 2150 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2151 | if (len < 0) |
2152 | goto out_overflow; | |
2153 | switch ((n = ntohl(*p++))) { | |
2154 | case RPC_SUCCESS: | |
2155 | return p; | |
2156 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2157 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2158 | "by server %s\n", task->tk_pid, __func__, | |
2159 | (unsigned int)clnt->cl_prog, | |
2160 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2161 | error = -EPFNOSUPPORT; |
2162 | goto out_err; | |
1da177e4 | 2163 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2164 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2165 | "by server %s\n", task->tk_pid, __func__, | |
2166 | (unsigned int)clnt->cl_prog, | |
2167 | (unsigned int)clnt->cl_vers, | |
2168 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2169 | error = -EPROTONOSUPPORT; |
2170 | goto out_err; | |
1da177e4 | 2171 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2172 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2173 | "version %u on server %s\n", |
0dc47877 | 2174 | task->tk_pid, __func__, |
3748f1e4 | 2175 | rpc_proc_name(task), |
4e0038b6 TM |
2176 | clnt->cl_prog, clnt->cl_vers, |
2177 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2178 | error = -EOPNOTSUPP; |
2179 | goto out_err; | |
1da177e4 | 2180 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2181 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2182 | task->tk_pid, __func__); |
1da177e4 LT |
2183 | break; /* retry */ |
2184 | default: | |
8a702bbb | 2185 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2186 | task->tk_pid, __func__, n); |
1da177e4 LT |
2187 | /* Also retry */ |
2188 | } | |
2189 | ||
abbcf28f | 2190 | out_garbage: |
4e0038b6 | 2191 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2192 | if (task->tk_garb_retry) { |
2193 | task->tk_garb_retry--; | |
46121cf7 | 2194 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2195 | task->tk_pid, __func__); |
1da177e4 | 2196 | task->tk_action = call_bind; |
abbcf28f TM |
2197 | out_retry: |
2198 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2199 | } |
1da177e4 LT |
2200 | out_eio: |
2201 | error = -EIO; | |
2202 | out_err: | |
2203 | rpc_exit(task, error); | |
8a702bbb | 2204 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2205 | __func__, error); |
abbcf28f | 2206 | return ERR_PTR(error); |
1da177e4 | 2207 | out_overflow: |
8a702bbb | 2208 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2209 | __func__); |
abbcf28f | 2210 | goto out_garbage; |
1da177e4 | 2211 | } |
5ee0ed7d | 2212 | |
9f06c719 | 2213 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2214 | { |
5ee0ed7d TM |
2215 | } |
2216 | ||
bf269551 | 2217 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2218 | { |
2219 | return 0; | |
2220 | } | |
2221 | ||
2222 | static struct rpc_procinfo rpcproc_null = { | |
2223 | .p_encode = rpcproc_encode_null, | |
2224 | .p_decode = rpcproc_decode_null, | |
2225 | }; | |
2226 | ||
caabea8a | 2227 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2228 | { |
2229 | struct rpc_message msg = { | |
2230 | .rpc_proc = &rpcproc_null, | |
2231 | }; | |
2232 | int err; | |
2233 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2234 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2235 | put_rpccred(msg.rpc_cred); |
2236 | return err; | |
2237 | } | |
188fef11 | 2238 | |
5e1550d6 TM |
2239 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2240 | { | |
2241 | struct rpc_message msg = { | |
2242 | .rpc_proc = &rpcproc_null, | |
2243 | .rpc_cred = cred, | |
2244 | }; | |
84115e1c TM |
2245 | struct rpc_task_setup task_setup_data = { |
2246 | .rpc_client = clnt, | |
2247 | .rpc_message = &msg, | |
2248 | .callback_ops = &rpc_default_ops, | |
2249 | .flags = flags, | |
2250 | }; | |
c970aa85 | 2251 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2252 | } |
e8914c65 | 2253 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2254 | |
188fef11 | 2255 | #ifdef RPC_DEBUG |
68a23ee9 CL |
2256 | static void rpc_show_header(void) |
2257 | { | |
cb3997b5 CL |
2258 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2259 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2260 | } |
2261 | ||
38e886e0 CL |
2262 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2263 | const struct rpc_task *task) | |
2264 | { | |
2265 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2266 | |
2267 | if (RPC_IS_QUEUED(task)) | |
2268 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2269 | ||
b3bcedad | 2270 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2271 | task->tk_pid, task->tk_flags, task->tk_status, |
2272 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
55909f21 | 2273 | clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), |
b3bcedad | 2274 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2275 | } |
2276 | ||
70abc49b | 2277 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2278 | { |
2279 | struct rpc_clnt *clnt; | |
38e886e0 | 2280 | struct rpc_task *task; |
68a23ee9 | 2281 | int header = 0; |
70abc49b | 2282 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2283 | |
70abc49b SK |
2284 | spin_lock(&sn->rpc_client_lock); |
2285 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2286 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2287 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2288 | if (!header) { |
2289 | rpc_show_header(); | |
2290 | header++; | |
2291 | } | |
38e886e0 | 2292 | rpc_show_task(clnt, task); |
188fef11 TM |
2293 | } |
2294 | spin_unlock(&clnt->cl_lock); | |
2295 | } | |
70abc49b | 2296 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2297 | } |
2298 | #endif |