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Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | /* |
55aa4f58 | 3 | * linux/net/sunrpc/clnt.c |
1da177e4 LT |
4 | * |
5 | * This file contains the high-level RPC interface. | |
6 | * It is modeled as a finite state machine to support both synchronous | |
7 | * and asynchronous requests. | |
8 | * | |
9 | * - RPC header generation and argument serialization. | |
10 | * - Credential refresh. | |
11 | * - TCP connect handling. | |
12 | * - Retry of operation when it is suspected the operation failed because | |
13 | * of uid squashing on the server, or when the credentials were stale | |
14 | * and need to be refreshed, or when a packet was damaged in transit. | |
15 | * This may be have to be moved to the VFS layer. | |
16 | * | |
1da177e4 LT |
17 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
18 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | |
22 | #include <linux/module.h> | |
23 | #include <linux/types.h> | |
cb3997b5 | 24 | #include <linux/kallsyms.h> |
1da177e4 | 25 | #include <linux/mm.h> |
23ac6581 TM |
26 | #include <linux/namei.h> |
27 | #include <linux/mount.h> | |
1da177e4 | 28 | #include <linux/slab.h> |
40b00b6b | 29 | #include <linux/rcupdate.h> |
1da177e4 | 30 | #include <linux/utsname.h> |
11c556b3 | 31 | #include <linux/workqueue.h> |
176e21ee | 32 | #include <linux/in.h> |
510deb0d | 33 | #include <linux/in6.h> |
176e21ee | 34 | #include <linux/un.h> |
1da177e4 LT |
35 | |
36 | #include <linux/sunrpc/clnt.h> | |
5976687a | 37 | #include <linux/sunrpc/addr.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> |
5753cba1 | 41 | #include <trace/events/sunrpc.h> |
1da177e4 | 42 | |
55ae1aab | 43 | #include "sunrpc.h" |
70abc49b | 44 | #include "netns.h" |
1da177e4 | 45 | |
f895b252 | 46 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
47 | # define RPCDBG_FACILITY RPCDBG_CALL |
48 | #endif | |
49 | ||
188fef11 TM |
50 | /* |
51 | * All RPC clients are linked into this list | |
52 | */ | |
188fef11 | 53 | |
1da177e4 LT |
54 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
55 | ||
56 | ||
57 | static void call_start(struct rpc_task *task); | |
58 | static void call_reserve(struct rpc_task *task); | |
59 | static void call_reserveresult(struct rpc_task *task); | |
60 | static void call_allocate(struct rpc_task *task); | |
762e4e67 | 61 | static void call_encode(struct rpc_task *task); |
1da177e4 LT |
62 | static void call_decode(struct rpc_task *task); |
63 | static void call_bind(struct rpc_task *task); | |
da351878 | 64 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
65 | static void call_transmit(struct rpc_task *task); |
66 | static void call_status(struct rpc_task *task); | |
940e3318 | 67 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
68 | static void call_refresh(struct rpc_task *task); |
69 | static void call_refreshresult(struct rpc_task *task); | |
1da177e4 LT |
70 | static void call_connect(struct rpc_task *task); |
71 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 72 | |
e8680a24 CL |
73 | static int rpc_encode_header(struct rpc_task *task, |
74 | struct xdr_stream *xdr); | |
a0584ee9 CL |
75 | static int rpc_decode_header(struct rpc_task *task, |
76 | struct xdr_stream *xdr); | |
caabea8a | 77 | static int rpc_ping(struct rpc_clnt *clnt); |
7b3fef8e | 78 | static void rpc_check_timeout(struct rpc_task *task); |
64c91a1f | 79 | |
188fef11 TM |
80 | static void rpc_register_client(struct rpc_clnt *clnt) |
81 | { | |
2446ab60 TM |
82 | struct net *net = rpc_net_ns(clnt); |
83 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
84 | |
85 | spin_lock(&sn->rpc_client_lock); | |
86 | list_add(&clnt->cl_clients, &sn->all_clients); | |
87 | spin_unlock(&sn->rpc_client_lock); | |
188fef11 TM |
88 | } |
89 | ||
90 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
91 | { | |
2446ab60 TM |
92 | struct net *net = rpc_net_ns(clnt); |
93 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
94 | |
95 | spin_lock(&sn->rpc_client_lock); | |
188fef11 | 96 | list_del(&clnt->cl_clients); |
70abc49b | 97 | spin_unlock(&sn->rpc_client_lock); |
188fef11 | 98 | } |
1da177e4 | 99 | |
0157d021 SK |
100 | static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) |
101 | { | |
c36dcfe1 | 102 | rpc_remove_client_dir(clnt); |
0157d021 SK |
103 | } |
104 | ||
105 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
106 | { | |
2446ab60 | 107 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 108 | struct super_block *pipefs_sb; |
0157d021 | 109 | |
2446ab60 | 110 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 111 | if (pipefs_sb) { |
0157d021 | 112 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 113 | rpc_put_sb_net(net); |
0157d021 | 114 | } |
0157d021 SK |
115 | } |
116 | ||
117 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
41b6b4d0 | 118 | struct rpc_clnt *clnt) |
1da177e4 | 119 | { |
f134585a | 120 | static uint32_t clntid; |
41b6b4d0 | 121 | const char *dir_name = clnt->cl_program->pipe_dir_name; |
23ac6581 | 122 | char name[15]; |
0157d021 | 123 | struct dentry *dir, *dentry; |
1da177e4 | 124 | |
0157d021 | 125 | dir = rpc_d_lookup_sb(sb, dir_name); |
922eeac3 WAA |
126 | if (dir == NULL) { |
127 | pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); | |
0157d021 | 128 | return dir; |
922eeac3 | 129 | } |
f134585a | 130 | for (;;) { |
a95e691f | 131 | snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
23ac6581 | 132 | name[sizeof(name) - 1] = '\0'; |
a95e691f | 133 | dentry = rpc_create_client_dir(dir, name, clnt); |
0157d021 | 134 | if (!IS_ERR(dentry)) |
23ac6581 | 135 | break; |
a95e691f AV |
136 | if (dentry == ERR_PTR(-EEXIST)) |
137 | continue; | |
138 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" | |
139 | " %s/%s, error %ld\n", | |
140 | dir_name, name, PTR_ERR(dentry)); | |
141 | break; | |
1da177e4 | 142 | } |
0157d021 SK |
143 | dput(dir); |
144 | return dentry; | |
145 | } | |
146 | ||
147 | static int | |
41b6b4d0 | 148 | rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt) |
0157d021 | 149 | { |
30507f58 | 150 | struct dentry *dentry; |
0157d021 | 151 | |
c36dcfe1 TM |
152 | if (clnt->cl_program->pipe_dir_name != NULL) { |
153 | dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt); | |
154 | if (IS_ERR(dentry)) | |
155 | return PTR_ERR(dentry); | |
156 | } | |
23ac6581 | 157 | return 0; |
1da177e4 LT |
158 | } |
159 | ||
41b6b4d0 | 160 | static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) |
ea8cfa06 | 161 | { |
41b6b4d0 | 162 | if (clnt->cl_program->pipe_dir_name == NULL) |
4f6bb246 | 163 | return 1; |
41b6b4d0 | 164 | |
c36dcfe1 TM |
165 | switch (event) { |
166 | case RPC_PIPEFS_MOUNT: | |
167 | if (clnt->cl_pipedir_objects.pdh_dentry != NULL) | |
168 | return 1; | |
169 | if (atomic_read(&clnt->cl_count) == 0) | |
170 | return 1; | |
171 | break; | |
172 | case RPC_PIPEFS_UMOUNT: | |
173 | if (clnt->cl_pipedir_objects.pdh_dentry == NULL) | |
174 | return 1; | |
175 | break; | |
176 | } | |
ea8cfa06 SK |
177 | return 0; |
178 | } | |
179 | ||
180 | static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, | |
181 | struct super_block *sb) | |
80df9d20 SK |
182 | { |
183 | struct dentry *dentry; | |
80df9d20 SK |
184 | |
185 | switch (event) { | |
186 | case RPC_PIPEFS_MOUNT: | |
41b6b4d0 | 187 | dentry = rpc_setup_pipedir_sb(sb, clnt); |
922eeac3 WAA |
188 | if (!dentry) |
189 | return -ENOENT; | |
80df9d20 SK |
190 | if (IS_ERR(dentry)) |
191 | return PTR_ERR(dentry); | |
80df9d20 SK |
192 | break; |
193 | case RPC_PIPEFS_UMOUNT: | |
194 | __rpc_clnt_remove_pipedir(clnt); | |
195 | break; | |
196 | default: | |
197 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
198 | return -ENOTSUPP; | |
199 | } | |
2813b626 | 200 | return 0; |
80df9d20 SK |
201 | } |
202 | ||
ea8cfa06 SK |
203 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
204 | struct super_block *sb) | |
205 | { | |
206 | int error = 0; | |
207 | ||
208 | for (;; clnt = clnt->cl_parent) { | |
209 | if (!rpc_clnt_skip_event(clnt, event)) | |
210 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
211 | if (error || clnt == clnt->cl_parent) | |
212 | break; | |
213 | } | |
214 | return error; | |
215 | } | |
216 | ||
da3b4622 SK |
217 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
218 | { | |
219 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
220 | struct rpc_clnt *clnt; | |
221 | ||
222 | spin_lock(&sn->rpc_client_lock); | |
223 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
ea8cfa06 | 224 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 225 | continue; |
da3b4622 SK |
226 | spin_unlock(&sn->rpc_client_lock); |
227 | return clnt; | |
228 | } | |
229 | spin_unlock(&sn->rpc_client_lock); | |
230 | return NULL; | |
231 | } | |
232 | ||
80df9d20 SK |
233 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
234 | void *ptr) | |
235 | { | |
236 | struct super_block *sb = ptr; | |
237 | struct rpc_clnt *clnt; | |
238 | int error = 0; | |
80df9d20 | 239 | |
da3b4622 | 240 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 SK |
241 | error = __rpc_pipefs_event(clnt, event, sb); |
242 | if (error) | |
243 | break; | |
244 | } | |
80df9d20 SK |
245 | return error; |
246 | } | |
247 | ||
248 | static struct notifier_block rpc_clients_block = { | |
249 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 250 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
251 | }; |
252 | ||
253 | int rpc_clients_notifier_register(void) | |
254 | { | |
255 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
256 | } | |
257 | ||
258 | void rpc_clients_notifier_unregister(void) | |
259 | { | |
260 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
261 | } | |
262 | ||
40b00b6b TM |
263 | static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt, |
264 | struct rpc_xprt *xprt, | |
265 | const struct rpc_timeout *timeout) | |
266 | { | |
267 | struct rpc_xprt *old; | |
268 | ||
269 | spin_lock(&clnt->cl_lock); | |
34751b9d TM |
270 | old = rcu_dereference_protected(clnt->cl_xprt, |
271 | lockdep_is_held(&clnt->cl_lock)); | |
40b00b6b TM |
272 | |
273 | if (!xprt_bound(xprt)) | |
274 | clnt->cl_autobind = 1; | |
275 | ||
276 | clnt->cl_timeout = timeout; | |
277 | rcu_assign_pointer(clnt->cl_xprt, xprt); | |
278 | spin_unlock(&clnt->cl_lock); | |
279 | ||
280 | return old; | |
281 | } | |
282 | ||
cbbb3449 TM |
283 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
284 | { | |
03a9a42a TM |
285 | clnt->cl_nodelen = strlcpy(clnt->cl_nodename, |
286 | nodename, sizeof(clnt->cl_nodename)); | |
cbbb3449 TM |
287 | } |
288 | ||
d746e545 CL |
289 | static int rpc_client_register(struct rpc_clnt *clnt, |
290 | rpc_authflavor_t pseudoflavor, | |
291 | const char *client_name) | |
e73f4cc0 | 292 | { |
c2190661 | 293 | struct rpc_auth_create_args auth_args = { |
d746e545 CL |
294 | .pseudoflavor = pseudoflavor, |
295 | .target_name = client_name, | |
c2190661 | 296 | }; |
e73f4cc0 SK |
297 | struct rpc_auth *auth; |
298 | struct net *net = rpc_net_ns(clnt); | |
299 | struct super_block *pipefs_sb; | |
eeee2452 | 300 | int err; |
e73f4cc0 | 301 | |
f9c72d10 | 302 | rpc_clnt_debugfs_register(clnt); |
b4b9d2cc | 303 | |
e73f4cc0 SK |
304 | pipefs_sb = rpc_get_sb_net(net); |
305 | if (pipefs_sb) { | |
41b6b4d0 | 306 | err = rpc_setup_pipedir(pipefs_sb, clnt); |
e73f4cc0 SK |
307 | if (err) |
308 | goto out; | |
309 | } | |
310 | ||
eeee2452 TM |
311 | rpc_register_client(clnt); |
312 | if (pipefs_sb) | |
313 | rpc_put_sb_net(net); | |
314 | ||
c2190661 | 315 | auth = rpcauth_create(&auth_args, clnt); |
e73f4cc0 SK |
316 | if (IS_ERR(auth)) { |
317 | dprintk("RPC: Couldn't create auth handle (flavor %u)\n", | |
d746e545 | 318 | pseudoflavor); |
e73f4cc0 SK |
319 | err = PTR_ERR(auth); |
320 | goto err_auth; | |
321 | } | |
eeee2452 TM |
322 | return 0; |
323 | err_auth: | |
324 | pipefs_sb = rpc_get_sb_net(net); | |
1540c5d3 | 325 | rpc_unregister_client(clnt); |
eeee2452 | 326 | __rpc_clnt_remove_pipedir(clnt); |
e73f4cc0 SK |
327 | out: |
328 | if (pipefs_sb) | |
329 | rpc_put_sb_net(net); | |
b4b9d2cc | 330 | rpc_clnt_debugfs_unregister(clnt); |
e73f4cc0 | 331 | return err; |
e73f4cc0 SK |
332 | } |
333 | ||
2f048db4 TM |
334 | static DEFINE_IDA(rpc_clids); |
335 | ||
c929ea0b KM |
336 | void rpc_cleanup_clids(void) |
337 | { | |
338 | ida_destroy(&rpc_clids); | |
339 | } | |
340 | ||
2f048db4 TM |
341 | static int rpc_alloc_clid(struct rpc_clnt *clnt) |
342 | { | |
343 | int clid; | |
344 | ||
345 | clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL); | |
346 | if (clid < 0) | |
347 | return clid; | |
348 | clnt->cl_clid = clid; | |
349 | return 0; | |
350 | } | |
351 | ||
352 | static void rpc_free_clid(struct rpc_clnt *clnt) | |
353 | { | |
354 | ida_simple_remove(&rpc_clids, clnt->cl_clid); | |
355 | } | |
356 | ||
280ebcf9 | 357 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, |
ad01b2c6 | 358 | struct rpc_xprt_switch *xps, |
280ebcf9 TM |
359 | struct rpc_xprt *xprt, |
360 | struct rpc_clnt *parent) | |
1da177e4 | 361 | { |
a613fa16 TM |
362 | const struct rpc_program *program = args->program; |
363 | const struct rpc_version *version; | |
40b00b6b TM |
364 | struct rpc_clnt *clnt = NULL; |
365 | const struct rpc_timeout *timeout; | |
03a9a42a | 366 | const char *nodename = args->nodename; |
1da177e4 | 367 | int err; |
06b8d255 | 368 | |
4ada539e TM |
369 | err = rpciod_up(); |
370 | if (err) | |
371 | goto out_no_rpciod; | |
698b6d08 | 372 | |
f05c124a | 373 | err = -EINVAL; |
698b6d08 TM |
374 | if (args->version >= program->nrvers) |
375 | goto out_err; | |
376 | version = program->version[args->version]; | |
377 | if (version == NULL) | |
1da177e4 LT |
378 | goto out_err; |
379 | ||
380 | err = -ENOMEM; | |
0da974f4 | 381 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
382 | if (!clnt) |
383 | goto out_err; | |
280ebcf9 | 384 | clnt->cl_parent = parent ? : clnt; |
1da177e4 | 385 | |
2f048db4 TM |
386 | err = rpc_alloc_clid(clnt); |
387 | if (err) | |
388 | goto out_no_clid; | |
1da177e4 | 389 | |
79caa5fa | 390 | clnt->cl_cred = get_cred(args->cred); |
1da177e4 LT |
391 | clnt->cl_procinfo = version->procs; |
392 | clnt->cl_maxproc = version->nrprocs; | |
d5b337b4 | 393 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 394 | clnt->cl_vers = version->number; |
1da177e4 | 395 | clnt->cl_stats = program->stats; |
11c556b3 | 396 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
6739ffb7 | 397 | rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); |
23bf85ba TM |
398 | err = -ENOMEM; |
399 | if (clnt->cl_metrics == NULL) | |
400 | goto out_no_stats; | |
3e32a5d9 | 401 | clnt->cl_program = program; |
6529eba0 | 402 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 403 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 404 | |
40b00b6b | 405 | timeout = xprt->timeout; |
ba7392bb TM |
406 | if (args->timeout != NULL) { |
407 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
408 | sizeof(clnt->cl_timeout_default)); | |
40b00b6b | 409 | timeout = &clnt->cl_timeout_default; |
ba7392bb TM |
410 | } |
411 | ||
40b00b6b | 412 | rpc_clnt_set_transport(clnt, xprt, timeout); |
ad01b2c6 TM |
413 | xprt_iter_init(&clnt->cl_xpi, xps); |
414 | xprt_switch_put(xps); | |
40b00b6b | 415 | |
1da177e4 | 416 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 417 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
1da177e4 | 418 | |
006abe88 | 419 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 420 | |
03a9a42a TM |
421 | if (nodename == NULL) |
422 | nodename = utsname()->nodename; | |
1da177e4 | 423 | /* save the nodename */ |
03a9a42a | 424 | rpc_clnt_set_nodename(clnt, nodename); |
e73f4cc0 | 425 | |
d746e545 | 426 | err = rpc_client_register(clnt, args->authflavor, args->client_name); |
e73f4cc0 SK |
427 | if (err) |
428 | goto out_no_path; | |
280ebcf9 TM |
429 | if (parent) |
430 | atomic_inc(&parent->cl_count); | |
42aad0d7 CL |
431 | |
432 | trace_rpc_clnt_new(clnt, xprt, program->name, args->servername); | |
1da177e4 LT |
433 | return clnt; |
434 | ||
1da177e4 | 435 | out_no_path: |
23bf85ba TM |
436 | rpc_free_iostats(clnt->cl_metrics); |
437 | out_no_stats: | |
79caa5fa | 438 | put_cred(clnt->cl_cred); |
2f048db4 TM |
439 | rpc_free_clid(clnt); |
440 | out_no_clid: | |
1da177e4 LT |
441 | kfree(clnt); |
442 | out_err: | |
4ada539e TM |
443 | rpciod_down(); |
444 | out_no_rpciod: | |
ad01b2c6 | 445 | xprt_switch_put(xps); |
f05c124a | 446 | xprt_put(xprt); |
42aad0d7 | 447 | trace_rpc_clnt_new_err(program->name, args->servername, err); |
1da177e4 LT |
448 | return ERR_PTR(err); |
449 | } | |
450 | ||
d50039ea | 451 | static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args, |
83ddfebd KM |
452 | struct rpc_xprt *xprt) |
453 | { | |
454 | struct rpc_clnt *clnt = NULL; | |
ad01b2c6 | 455 | struct rpc_xprt_switch *xps; |
83ddfebd | 456 | |
39a9beab | 457 | if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) { |
16590a22 | 458 | WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC)); |
39a9beab BF |
459 | xps = args->bc_xprt->xpt_bc_xps; |
460 | xprt_switch_get(xps); | |
461 | } else { | |
462 | xps = xprt_switch_alloc(xprt, GFP_KERNEL); | |
463 | if (xps == NULL) { | |
464 | xprt_put(xprt); | |
465 | return ERR_PTR(-ENOMEM); | |
466 | } | |
467 | if (xprt->bc_xprt) { | |
468 | xprt_switch_get(xps); | |
469 | xprt->bc_xprt->xpt_bc_xps = xps; | |
470 | } | |
1208fd56 | 471 | } |
ad01b2c6 | 472 | clnt = rpc_new_client(args, xps, xprt, NULL); |
83ddfebd KM |
473 | if (IS_ERR(clnt)) |
474 | return clnt; | |
475 | ||
476 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
477 | int err = rpc_ping(clnt); | |
478 | if (err != 0) { | |
479 | rpc_shutdown_client(clnt); | |
480 | return ERR_PTR(err); | |
481 | } | |
482 | } | |
483 | ||
484 | clnt->cl_softrtry = 1; | |
ae6ec918 | 485 | if (args->flags & (RPC_CLNT_CREATE_HARDRTRY|RPC_CLNT_CREATE_SOFTERR)) { |
83ddfebd | 486 | clnt->cl_softrtry = 0; |
ae6ec918 TM |
487 | if (args->flags & RPC_CLNT_CREATE_SOFTERR) |
488 | clnt->cl_softerr = 1; | |
489 | } | |
83ddfebd KM |
490 | |
491 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
492 | clnt->cl_autobind = 1; | |
2aca5b86 TM |
493 | if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT) |
494 | clnt->cl_noretranstimeo = 1; | |
83ddfebd KM |
495 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
496 | clnt->cl_discrtry = 1; | |
497 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) | |
498 | clnt->cl_chatty = 1; | |
499 | ||
500 | return clnt; | |
501 | } | |
83ddfebd | 502 | |
2c53040f | 503 | /** |
c2866763 CL |
504 | * rpc_create - create an RPC client and transport with one call |
505 | * @args: rpc_clnt create argument structure | |
506 | * | |
507 | * Creates and initializes an RPC transport and an RPC client. | |
508 | * | |
509 | * It can ping the server in order to determine if it is up, and to see if | |
510 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
511 | * this behavior so asynchronous tasks can also use rpc_create. | |
512 | */ | |
513 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
514 | { | |
515 | struct rpc_xprt *xprt; | |
3c341b0b | 516 | struct xprt_create xprtargs = { |
9a23e332 | 517 | .net = args->net, |
4fa016eb | 518 | .ident = args->protocol, |
d3bc9a1d | 519 | .srcaddr = args->saddress, |
96802a09 FM |
520 | .dstaddr = args->address, |
521 | .addrlen = args->addrsize, | |
4e0038b6 | 522 | .servername = args->servername, |
f300baba | 523 | .bc_xprt = args->bc_xprt, |
96802a09 | 524 | }; |
510deb0d | 525 | char servername[48]; |
612b41f8 TM |
526 | struct rpc_clnt *clnt; |
527 | int i; | |
c2866763 | 528 | |
d50039ea | 529 | if (args->bc_xprt) { |
16590a22 | 530 | WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC)); |
d50039ea BF |
531 | xprt = args->bc_xprt->xpt_bc_xprt; |
532 | if (xprt) { | |
533 | xprt_get(xprt); | |
534 | return rpc_create_xprt(args, xprt); | |
535 | } | |
536 | } | |
537 | ||
b7993ceb TM |
538 | if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) |
539 | xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; | |
33d90ac0 BF |
540 | if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) |
541 | xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; | |
43780b87 CL |
542 | /* |
543 | * If the caller chooses not to specify a hostname, whip | |
544 | * up a string representation of the passed-in address. | |
545 | */ | |
4e0038b6 | 546 | if (xprtargs.servername == NULL) { |
176e21ee CL |
547 | struct sockaddr_un *sun = |
548 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
549 | struct sockaddr_in *sin = |
550 | (struct sockaddr_in *)args->address; | |
551 | struct sockaddr_in6 *sin6 = | |
552 | (struct sockaddr_in6 *)args->address; | |
553 | ||
510deb0d CL |
554 | servername[0] = '\0'; |
555 | switch (args->address->sa_family) { | |
176e21ee CL |
556 | case AF_LOCAL: |
557 | snprintf(servername, sizeof(servername), "%s", | |
558 | sun->sun_path); | |
559 | break; | |
da09eb93 | 560 | case AF_INET: |
21454aaa HH |
561 | snprintf(servername, sizeof(servername), "%pI4", |
562 | &sin->sin_addr.s_addr); | |
510deb0d | 563 | break; |
da09eb93 | 564 | case AF_INET6: |
5b095d98 | 565 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 566 | &sin6->sin6_addr); |
510deb0d | 567 | break; |
510deb0d CL |
568 | default: |
569 | /* caller wants default server name, but | |
570 | * address family isn't recognized. */ | |
571 | return ERR_PTR(-EINVAL); | |
572 | } | |
4e0038b6 | 573 | xprtargs.servername = servername; |
43780b87 CL |
574 | } |
575 | ||
510deb0d CL |
576 | xprt = xprt_create_transport(&xprtargs); |
577 | if (IS_ERR(xprt)) | |
578 | return (struct rpc_clnt *)xprt; | |
579 | ||
c2866763 CL |
580 | /* |
581 | * By default, kernel RPC client connects from a reserved port. | |
582 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
583 | * but it is always enabled for rpciod, which handles the connect | |
584 | * operation. | |
585 | */ | |
586 | xprt->resvport = 1; | |
587 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
588 | xprt->resvport = 0; | |
e6237b6f TM |
589 | xprt->reuseport = 0; |
590 | if (args->flags & RPC_CLNT_CREATE_REUSEPORT) | |
591 | xprt->reuseport = 1; | |
c2866763 | 592 | |
612b41f8 TM |
593 | clnt = rpc_create_xprt(args, xprt); |
594 | if (IS_ERR(clnt) || args->nconnect <= 1) | |
595 | return clnt; | |
596 | ||
597 | for (i = 0; i < args->nconnect - 1; i++) { | |
598 | if (rpc_clnt_add_xprt(clnt, &xprtargs, NULL, NULL) < 0) | |
599 | break; | |
600 | } | |
601 | return clnt; | |
c2866763 | 602 | } |
b86acd50 | 603 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 604 | |
1da177e4 LT |
605 | /* |
606 | * This function clones the RPC client structure. It allows us to share the | |
607 | * same transport while varying parameters such as the authentication | |
608 | * flavour. | |
609 | */ | |
1b63a751 CL |
610 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
611 | struct rpc_clnt *clnt) | |
1da177e4 | 612 | { |
ad01b2c6 | 613 | struct rpc_xprt_switch *xps; |
2446ab60 | 614 | struct rpc_xprt *xprt; |
1b63a751 CL |
615 | struct rpc_clnt *new; |
616 | int err; | |
1da177e4 | 617 | |
1b63a751 | 618 | err = -ENOMEM; |
2446ab60 TM |
619 | rcu_read_lock(); |
620 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
ad01b2c6 | 621 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); |
2446ab60 | 622 | rcu_read_unlock(); |
ad01b2c6 TM |
623 | if (xprt == NULL || xps == NULL) { |
624 | xprt_put(xprt); | |
625 | xprt_switch_put(xps); | |
1b63a751 | 626 | goto out_err; |
ad01b2c6 | 627 | } |
1b63a751 | 628 | args->servername = xprt->servername; |
03a9a42a | 629 | args->nodename = clnt->cl_nodename; |
1b63a751 | 630 | |
ad01b2c6 | 631 | new = rpc_new_client(args, xps, xprt, clnt); |
42aad0d7 CL |
632 | if (IS_ERR(new)) |
633 | return new; | |
1b63a751 | 634 | |
1b63a751 CL |
635 | /* Turn off autobind on clones */ |
636 | new->cl_autobind = 0; | |
637 | new->cl_softrtry = clnt->cl_softrtry; | |
ae6ec918 | 638 | new->cl_softerr = clnt->cl_softerr; |
2aca5b86 | 639 | new->cl_noretranstimeo = clnt->cl_noretranstimeo; |
1b63a751 CL |
640 | new->cl_discrtry = clnt->cl_discrtry; |
641 | new->cl_chatty = clnt->cl_chatty; | |
5e16923b | 642 | new->cl_principal = clnt->cl_principal; |
1da177e4 | 643 | return new; |
1b63a751 | 644 | |
1b63a751 | 645 | out_err: |
42aad0d7 | 646 | trace_rpc_clnt_clone_err(clnt, err); |
3e32a5d9 | 647 | return ERR_PTR(err); |
1da177e4 | 648 | } |
1b63a751 CL |
649 | |
650 | /** | |
651 | * rpc_clone_client - Clone an RPC client structure | |
652 | * | |
653 | * @clnt: RPC client whose parameters are copied | |
654 | * | |
655 | * Returns a fresh RPC client or an ERR_PTR. | |
656 | */ | |
657 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
658 | { | |
659 | struct rpc_create_args args = { | |
660 | .program = clnt->cl_program, | |
661 | .prognumber = clnt->cl_prog, | |
662 | .version = clnt->cl_vers, | |
663 | .authflavor = clnt->cl_auth->au_flavor, | |
79caa5fa | 664 | .cred = clnt->cl_cred, |
1b63a751 CL |
665 | }; |
666 | return __rpc_clone_client(&args, clnt); | |
667 | } | |
e8914c65 | 668 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 669 | |
ba9b584c CL |
670 | /** |
671 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
672 | * | |
673 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 674 | * @flavor: security flavor for new client |
ba9b584c CL |
675 | * |
676 | * Returns a fresh RPC client or an ERR_PTR. | |
677 | */ | |
678 | struct rpc_clnt * | |
679 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
680 | { | |
681 | struct rpc_create_args args = { | |
682 | .program = clnt->cl_program, | |
683 | .prognumber = clnt->cl_prog, | |
684 | .version = clnt->cl_vers, | |
685 | .authflavor = flavor, | |
79caa5fa | 686 | .cred = clnt->cl_cred, |
ba9b584c CL |
687 | }; |
688 | return __rpc_clone_client(&args, clnt); | |
689 | } | |
690 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
691 | ||
40b00b6b TM |
692 | /** |
693 | * rpc_switch_client_transport: switch the RPC transport on the fly | |
694 | * @clnt: pointer to a struct rpc_clnt | |
695 | * @args: pointer to the new transport arguments | |
696 | * @timeout: pointer to the new timeout parameters | |
697 | * | |
698 | * This function allows the caller to switch the RPC transport for the | |
699 | * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS | |
700 | * server, for instance. It assumes that the caller has ensured that | |
701 | * there are no active RPC tasks by using some form of locking. | |
702 | * | |
703 | * Returns zero if "clnt" is now using the new xprt. Otherwise a | |
704 | * negative errno is returned, and "clnt" continues to use the old | |
705 | * xprt. | |
706 | */ | |
707 | int rpc_switch_client_transport(struct rpc_clnt *clnt, | |
708 | struct xprt_create *args, | |
709 | const struct rpc_timeout *timeout) | |
710 | { | |
711 | const struct rpc_timeout *old_timeo; | |
712 | rpc_authflavor_t pseudoflavor; | |
ad01b2c6 | 713 | struct rpc_xprt_switch *xps, *oldxps; |
40b00b6b TM |
714 | struct rpc_xprt *xprt, *old; |
715 | struct rpc_clnt *parent; | |
716 | int err; | |
717 | ||
718 | xprt = xprt_create_transport(args); | |
42aad0d7 | 719 | if (IS_ERR(xprt)) |
40b00b6b | 720 | return PTR_ERR(xprt); |
40b00b6b | 721 | |
ad01b2c6 TM |
722 | xps = xprt_switch_alloc(xprt, GFP_KERNEL); |
723 | if (xps == NULL) { | |
724 | xprt_put(xprt); | |
725 | return -ENOMEM; | |
726 | } | |
727 | ||
40b00b6b TM |
728 | pseudoflavor = clnt->cl_auth->au_flavor; |
729 | ||
730 | old_timeo = clnt->cl_timeout; | |
731 | old = rpc_clnt_set_transport(clnt, xprt, timeout); | |
ad01b2c6 | 732 | oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps); |
40b00b6b TM |
733 | |
734 | rpc_unregister_client(clnt); | |
735 | __rpc_clnt_remove_pipedir(clnt); | |
b4b9d2cc | 736 | rpc_clnt_debugfs_unregister(clnt); |
40b00b6b TM |
737 | |
738 | /* | |
739 | * A new transport was created. "clnt" therefore | |
740 | * becomes the root of a new cl_parent tree. clnt's | |
741 | * children, if it has any, still point to the old xprt. | |
742 | */ | |
743 | parent = clnt->cl_parent; | |
744 | clnt->cl_parent = clnt; | |
745 | ||
746 | /* | |
747 | * The old rpc_auth cache cannot be re-used. GSS | |
748 | * contexts in particular are between a single | |
749 | * client and server. | |
750 | */ | |
751 | err = rpc_client_register(clnt, pseudoflavor, NULL); | |
752 | if (err) | |
753 | goto out_revert; | |
754 | ||
755 | synchronize_rcu(); | |
756 | if (parent != clnt) | |
757 | rpc_release_client(parent); | |
ad01b2c6 | 758 | xprt_switch_put(oldxps); |
40b00b6b | 759 | xprt_put(old); |
42aad0d7 | 760 | trace_rpc_clnt_replace_xprt(clnt); |
40b00b6b TM |
761 | return 0; |
762 | ||
763 | out_revert: | |
ad01b2c6 | 764 | xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps); |
40b00b6b TM |
765 | rpc_clnt_set_transport(clnt, old, old_timeo); |
766 | clnt->cl_parent = parent; | |
767 | rpc_client_register(clnt, pseudoflavor, NULL); | |
ad01b2c6 | 768 | xprt_switch_put(xps); |
40b00b6b | 769 | xprt_put(xprt); |
42aad0d7 | 770 | trace_rpc_clnt_replace_xprt_err(clnt); |
40b00b6b TM |
771 | return err; |
772 | } | |
773 | EXPORT_SYMBOL_GPL(rpc_switch_client_transport); | |
774 | ||
3227886c TM |
775 | static |
776 | int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi) | |
777 | { | |
778 | struct rpc_xprt_switch *xps; | |
779 | ||
780 | rcu_read_lock(); | |
781 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); | |
782 | rcu_read_unlock(); | |
783 | if (xps == NULL) | |
784 | return -EAGAIN; | |
785 | xprt_iter_init_listall(xpi, xps); | |
786 | xprt_switch_put(xps); | |
787 | return 0; | |
788 | } | |
789 | ||
790 | /** | |
791 | * rpc_clnt_iterate_for_each_xprt - Apply a function to all transports | |
792 | * @clnt: pointer to client | |
793 | * @fn: function to apply | |
794 | * @data: void pointer to function data | |
795 | * | |
796 | * Iterates through the list of RPC transports currently attached to the | |
797 | * client and applies the function fn(clnt, xprt, data). | |
798 | * | |
799 | * On error, the iteration stops, and the function returns the error value. | |
800 | */ | |
801 | int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt, | |
802 | int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *), | |
803 | void *data) | |
804 | { | |
805 | struct rpc_xprt_iter xpi; | |
806 | int ret; | |
807 | ||
808 | ret = rpc_clnt_xprt_iter_init(clnt, &xpi); | |
809 | if (ret) | |
810 | return ret; | |
811 | for (;;) { | |
812 | struct rpc_xprt *xprt = xprt_iter_get_next(&xpi); | |
813 | ||
814 | if (!xprt) | |
815 | break; | |
816 | ret = fn(clnt, xprt, data); | |
817 | xprt_put(xprt); | |
818 | if (ret < 0) | |
819 | break; | |
820 | } | |
821 | xprt_iter_destroy(&xpi); | |
822 | return ret; | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt); | |
825 | ||
58f9612c TM |
826 | /* |
827 | * Kill all tasks for the given client. | |
828 | * XXX: kill their descendants as well? | |
829 | */ | |
830 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
831 | { | |
832 | struct rpc_task *rovr; | |
833 | ||
834 | ||
835 | if (list_empty(&clnt->cl_tasks)) | |
836 | return; | |
42aad0d7 | 837 | |
58f9612c TM |
838 | /* |
839 | * Spin lock all_tasks to prevent changes... | |
840 | */ | |
42aad0d7 | 841 | trace_rpc_clnt_killall(clnt); |
58f9612c | 842 | spin_lock(&clnt->cl_lock); |
ae67bd38 TM |
843 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) |
844 | rpc_signal_task(rovr); | |
58f9612c TM |
845 | spin_unlock(&clnt->cl_lock); |
846 | } | |
847 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
848 | ||
1da177e4 LT |
849 | /* |
850 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 851 | * requests. |
1da177e4 | 852 | */ |
4c402b40 | 853 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 854 | { |
168e4b39 WAA |
855 | might_sleep(); |
856 | ||
42aad0d7 | 857 | trace_rpc_clnt_shutdown(clnt); |
1da177e4 | 858 | |
34f52e35 | 859 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 860 | rpc_killall_tasks(clnt); |
532347e2 | 861 | wait_event_timeout(destroy_wait, |
34f52e35 | 862 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
863 | } |
864 | ||
4c402b40 | 865 | rpc_release_client(clnt); |
1da177e4 | 866 | } |
e8914c65 | 867 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
868 | |
869 | /* | |
34f52e35 | 870 | * Free an RPC client |
1da177e4 | 871 | */ |
7c4310ff N |
872 | static void rpc_free_client_work(struct work_struct *work) |
873 | { | |
874 | struct rpc_clnt *clnt = container_of(work, struct rpc_clnt, cl_work); | |
875 | ||
42aad0d7 CL |
876 | trace_rpc_clnt_free(clnt); |
877 | ||
7c4310ff N |
878 | /* These might block on processes that might allocate memory, |
879 | * so they cannot be called in rpciod, so they are handled separately | |
880 | * here. | |
881 | */ | |
882 | rpc_clnt_debugfs_unregister(clnt); | |
933496e9 | 883 | rpc_free_clid(clnt); |
7c4310ff | 884 | rpc_clnt_remove_pipedir(clnt); |
31e9a7f3 | 885 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
7c4310ff N |
886 | |
887 | kfree(clnt); | |
888 | rpciod_down(); | |
889 | } | |
d07ba842 | 890 | static struct rpc_clnt * |
006abe88 | 891 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 892 | { |
d07ba842 TM |
893 | struct rpc_clnt *parent = NULL; |
894 | ||
42aad0d7 | 895 | trace_rpc_clnt_release(clnt); |
6eac7d3f | 896 | if (clnt->cl_parent != clnt) |
d07ba842 | 897 | parent = clnt->cl_parent; |
adb6fa7f | 898 | rpc_unregister_client(clnt); |
11c556b3 CL |
899 | rpc_free_iostats(clnt->cl_metrics); |
900 | clnt->cl_metrics = NULL; | |
ad01b2c6 | 901 | xprt_iter_destroy(&clnt->cl_xpi); |
79caa5fa | 902 | put_cred(clnt->cl_cred); |
7c4310ff N |
903 | |
904 | INIT_WORK(&clnt->cl_work, rpc_free_client_work); | |
905 | schedule_work(&clnt->cl_work); | |
d07ba842 | 906 | return parent; |
1da177e4 LT |
907 | } |
908 | ||
1dd17ec6 TM |
909 | /* |
910 | * Free an RPC client | |
911 | */ | |
8fdee4cc | 912 | static struct rpc_clnt * |
006abe88 | 913 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 914 | { |
d07ba842 TM |
915 | if (clnt->cl_auth == NULL) |
916 | return rpc_free_client(clnt); | |
1dd17ec6 TM |
917 | |
918 | /* | |
919 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
920 | * release remaining GSS contexts. This mechanism ensures | |
921 | * that it can do so safely. | |
922 | */ | |
006abe88 | 923 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
924 | rpcauth_release(clnt->cl_auth); |
925 | clnt->cl_auth = NULL; | |
006abe88 | 926 | if (atomic_dec_and_test(&clnt->cl_count)) |
d07ba842 TM |
927 | return rpc_free_client(clnt); |
928 | return NULL; | |
1dd17ec6 TM |
929 | } |
930 | ||
1da177e4 | 931 | /* |
34f52e35 | 932 | * Release reference to the RPC client |
1da177e4 LT |
933 | */ |
934 | void | |
935 | rpc_release_client(struct rpc_clnt *clnt) | |
936 | { | |
d07ba842 TM |
937 | do { |
938 | if (list_empty(&clnt->cl_tasks)) | |
939 | wake_up(&destroy_wait); | |
940 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
941 | break; | |
942 | clnt = rpc_free_auth(clnt); | |
943 | } while (clnt != NULL); | |
34f52e35 | 944 | } |
1d658336 | 945 | EXPORT_SYMBOL_GPL(rpc_release_client); |
34f52e35 | 946 | |
007e251f AG |
947 | /** |
948 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
949 | * @old: old rpc_client |
950 | * @program: rpc program to set | |
951 | * @vers: rpc program version | |
007e251f AG |
952 | * |
953 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
954 | * of use for enabling different RPC programs to share the same transport. | |
955 | * The Sun NFSv2/v3 ACL protocol can do this. | |
956 | */ | |
957 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 958 | const struct rpc_program *program, |
89eb21c3 | 959 | u32 vers) |
007e251f | 960 | { |
f994c43d TM |
961 | struct rpc_create_args args = { |
962 | .program = program, | |
963 | .prognumber = program->number, | |
964 | .version = vers, | |
965 | .authflavor = old->cl_auth->au_flavor, | |
79caa5fa | 966 | .cred = old->cl_cred, |
f994c43d | 967 | }; |
007e251f | 968 | struct rpc_clnt *clnt; |
007e251f AG |
969 | int err; |
970 | ||
f994c43d | 971 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
972 | if (IS_ERR(clnt)) |
973 | goto out; | |
caabea8a | 974 | err = rpc_ping(clnt); |
007e251f AG |
975 | if (err != 0) { |
976 | rpc_shutdown_client(clnt); | |
977 | clnt = ERR_PTR(err); | |
978 | } | |
cca5172a | 979 | out: |
007e251f AG |
980 | return clnt; |
981 | } | |
e8914c65 | 982 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 983 | |
a101b043 TM |
984 | struct rpc_xprt * |
985 | rpc_task_get_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) | |
21f0ffaf TM |
986 | { |
987 | struct rpc_xprt_switch *xps; | |
21f0ffaf TM |
988 | |
989 | if (!xprt) | |
990 | return NULL; | |
991 | rcu_read_lock(); | |
992 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); | |
993 | atomic_long_inc(&xps->xps_queuelen); | |
994 | rcu_read_unlock(); | |
995 | atomic_long_inc(&xprt->queuelen); | |
996 | ||
997 | return xprt; | |
998 | } | |
999 | ||
1000 | static void | |
1001 | rpc_task_release_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) | |
1002 | { | |
1003 | struct rpc_xprt_switch *xps; | |
1004 | ||
1005 | atomic_long_dec(&xprt->queuelen); | |
1006 | rcu_read_lock(); | |
1007 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); | |
1008 | atomic_long_dec(&xps->xps_queuelen); | |
1009 | rcu_read_unlock(); | |
1010 | ||
1011 | xprt_put(xprt); | |
1012 | } | |
1013 | ||
0f90be13 BB |
1014 | void rpc_task_release_transport(struct rpc_task *task) |
1015 | { | |
1016 | struct rpc_xprt *xprt = task->tk_xprt; | |
1017 | ||
1018 | if (xprt) { | |
1019 | task->tk_xprt = NULL; | |
21f0ffaf TM |
1020 | if (task->tk_client) |
1021 | rpc_task_release_xprt(task->tk_client, xprt); | |
1022 | else | |
1023 | xprt_put(xprt); | |
0f90be13 BB |
1024 | } |
1025 | } | |
1026 | EXPORT_SYMBOL_GPL(rpc_task_release_transport); | |
1027 | ||
58f9612c TM |
1028 | void rpc_task_release_client(struct rpc_task *task) |
1029 | { | |
1030 | struct rpc_clnt *clnt = task->tk_client; | |
1031 | ||
21f0ffaf | 1032 | rpc_task_release_transport(task); |
58f9612c TM |
1033 | if (clnt != NULL) { |
1034 | /* Remove from client task list */ | |
1035 | spin_lock(&clnt->cl_lock); | |
1036 | list_del(&task->tk_task); | |
1037 | spin_unlock(&clnt->cl_lock); | |
1038 | task->tk_client = NULL; | |
1039 | ||
1040 | rpc_release_client(clnt); | |
1041 | } | |
0f90be13 | 1042 | } |
fb43d172 | 1043 | |
a101b043 TM |
1044 | static struct rpc_xprt * |
1045 | rpc_task_get_first_xprt(struct rpc_clnt *clnt) | |
1046 | { | |
1047 | struct rpc_xprt *xprt; | |
1048 | ||
1049 | rcu_read_lock(); | |
1050 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
1051 | rcu_read_unlock(); | |
1052 | return rpc_task_get_xprt(clnt, xprt); | |
1053 | } | |
1054 | ||
1055 | static struct rpc_xprt * | |
1056 | rpc_task_get_next_xprt(struct rpc_clnt *clnt) | |
1057 | { | |
1058 | return rpc_task_get_xprt(clnt, xprt_iter_get_next(&clnt->cl_xpi)); | |
1059 | } | |
1060 | ||
0f90be13 BB |
1061 | static |
1062 | void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt) | |
1063 | { | |
5a0c257f N |
1064 | if (task->tk_xprt) |
1065 | return; | |
1066 | if (task->tk_flags & RPC_TASK_NO_ROUND_ROBIN) | |
1067 | task->tk_xprt = rpc_task_get_first_xprt(clnt); | |
1068 | else | |
a101b043 | 1069 | task->tk_xprt = rpc_task_get_next_xprt(clnt); |
58f9612c TM |
1070 | } |
1071 | ||
1072 | static | |
1073 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
1074 | { | |
fb43d172 | 1075 | |
58f9612c | 1076 | if (clnt != NULL) { |
0f90be13 | 1077 | rpc_task_set_transport(task, clnt); |
58f9612c | 1078 | task->tk_client = clnt; |
006abe88 | 1079 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
1080 | if (clnt->cl_softrtry) |
1081 | task->tk_flags |= RPC_TASK_SOFT; | |
ae6ec918 TM |
1082 | if (clnt->cl_softerr) |
1083 | task->tk_flags |= RPC_TASK_TIMEOUT; | |
8a19a0b6 TM |
1084 | if (clnt->cl_noretranstimeo) |
1085 | task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT; | |
3c87ef6e JL |
1086 | if (atomic_read(&clnt->cl_swapper)) |
1087 | task->tk_flags |= RPC_TASK_SWAPPER; | |
58f9612c TM |
1088 | /* Add to the client's list of all tasks */ |
1089 | spin_lock(&clnt->cl_lock); | |
1090 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
1091 | spin_unlock(&clnt->cl_lock); | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | static void | |
1096 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
1097 | { | |
1098 | if (msg != NULL) { | |
1099 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
1100 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
1101 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
7eac5264 TM |
1102 | task->tk_msg.rpc_cred = msg->rpc_cred; |
1103 | if (!(task->tk_flags & RPC_TASK_CRED_NOREF)) | |
1104 | get_cred(task->tk_msg.rpc_cred); | |
58f9612c TM |
1105 | } |
1106 | } | |
1107 | ||
1da177e4 LT |
1108 | /* |
1109 | * Default callback for async RPC calls | |
1110 | */ | |
1111 | static void | |
963d8fe5 | 1112 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
1113 | { |
1114 | } | |
1115 | ||
963d8fe5 TM |
1116 | static const struct rpc_call_ops rpc_default_ops = { |
1117 | .rpc_call_done = rpc_default_callback, | |
1118 | }; | |
1119 | ||
c970aa85 TM |
1120 | /** |
1121 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
1122 | * @task_setup_data: pointer to task initialisation data | |
1123 | */ | |
1124 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 1125 | { |
19445b99 | 1126 | struct rpc_task *task; |
6e5b70e9 | 1127 | |
84115e1c | 1128 | task = rpc_new_task(task_setup_data); |
6e5b70e9 | 1129 | |
263fb9c2 TM |
1130 | if (!RPC_IS_ASYNC(task)) |
1131 | task->tk_flags |= RPC_TASK_CRED_NOREF; | |
1132 | ||
58f9612c TM |
1133 | rpc_task_set_client(task, task_setup_data->rpc_client); |
1134 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
1135 | ||
58f9612c TM |
1136 | if (task->tk_action == NULL) |
1137 | rpc_call_start(task); | |
1138 | ||
6e5b70e9 TM |
1139 | atomic_inc(&task->tk_count); |
1140 | rpc_execute(task); | |
19445b99 | 1141 | return task; |
6e5b70e9 | 1142 | } |
c970aa85 | 1143 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
1144 | |
1145 | /** | |
1146 | * rpc_call_sync - Perform a synchronous RPC call | |
1147 | * @clnt: pointer to RPC client | |
1148 | * @msg: RPC call parameters | |
1149 | * @flags: RPC call flags | |
1da177e4 | 1150 | */ |
cbc20059 | 1151 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
1152 | { |
1153 | struct rpc_task *task; | |
84115e1c TM |
1154 | struct rpc_task_setup task_setup_data = { |
1155 | .rpc_client = clnt, | |
1156 | .rpc_message = msg, | |
1157 | .callback_ops = &rpc_default_ops, | |
1158 | .flags = flags, | |
1159 | }; | |
6e5b70e9 | 1160 | int status; |
1da177e4 | 1161 | |
50d2bdb1 WAA |
1162 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
1163 | if (flags & RPC_TASK_ASYNC) { | |
1164 | rpc_release_calldata(task_setup_data.callback_ops, | |
1165 | task_setup_data.callback_data); | |
1166 | return -EINVAL; | |
1167 | } | |
1da177e4 | 1168 | |
c970aa85 | 1169 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1170 | if (IS_ERR(task)) |
1171 | return PTR_ERR(task); | |
e60859ac | 1172 | status = task->tk_status; |
bde8f00c | 1173 | rpc_put_task(task); |
1da177e4 LT |
1174 | return status; |
1175 | } | |
e8914c65 | 1176 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 1177 | |
6e5b70e9 TM |
1178 | /** |
1179 | * rpc_call_async - Perform an asynchronous RPC call | |
1180 | * @clnt: pointer to RPC client | |
1181 | * @msg: RPC call parameters | |
1182 | * @flags: RPC call flags | |
65b6e42c | 1183 | * @tk_ops: RPC call ops |
6e5b70e9 | 1184 | * @data: user call data |
1da177e4 LT |
1185 | */ |
1186 | int | |
cbc20059 | 1187 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 1188 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
1189 | { |
1190 | struct rpc_task *task; | |
84115e1c TM |
1191 | struct rpc_task_setup task_setup_data = { |
1192 | .rpc_client = clnt, | |
1193 | .rpc_message = msg, | |
1194 | .callback_ops = tk_ops, | |
1195 | .callback_data = data, | |
1196 | .flags = flags|RPC_TASK_ASYNC, | |
1197 | }; | |
1da177e4 | 1198 | |
c970aa85 | 1199 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1200 | if (IS_ERR(task)) |
1201 | return PTR_ERR(task); | |
1202 | rpc_put_task(task); | |
1203 | return 0; | |
1da177e4 | 1204 | } |
e8914c65 | 1205 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 1206 | |
9e00abc3 | 1207 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
477687e1 TM |
1208 | static void call_bc_encode(struct rpc_task *task); |
1209 | ||
55ae1aab RL |
1210 | /** |
1211 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
1212 | * rpc_execute against it | |
7a73fdde | 1213 | * @req: RPC request |
55ae1aab | 1214 | */ |
0f419791 | 1215 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req) |
55ae1aab RL |
1216 | { |
1217 | struct rpc_task *task; | |
55ae1aab | 1218 | struct rpc_task_setup task_setup_data = { |
0f419791 | 1219 | .callback_ops = &rpc_default_ops, |
762e4e67 TM |
1220 | .flags = RPC_TASK_SOFTCONN | |
1221 | RPC_TASK_NO_RETRANS_TIMEOUT, | |
55ae1aab RL |
1222 | }; |
1223 | ||
1224 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
1225 | /* | |
1226 | * Create an rpc_task to send the data | |
1227 | */ | |
1228 | task = rpc_new_task(&task_setup_data); | |
902c5887 | 1229 | xprt_init_bc_request(req, task); |
55ae1aab | 1230 | |
477687e1 | 1231 | task->tk_action = call_bc_encode; |
55ae1aab | 1232 | atomic_inc(&task->tk_count); |
9a6478f6 | 1233 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
1234 | rpc_execute(task); |
1235 | ||
55ae1aab RL |
1236 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); |
1237 | return task; | |
1238 | } | |
9e00abc3 | 1239 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1240 | |
cf500bac CL |
1241 | /** |
1242 | * rpc_prepare_reply_pages - Prepare to receive a reply data payload into pages | |
1243 | * @req: RPC request to prepare | |
1244 | * @pages: vector of struct page pointers | |
1245 | * @base: offset in first page where receive should start, in bytes | |
1246 | * @len: expected size of the upper layer data payload, in bytes | |
1247 | * @hdrsize: expected size of upper layer reply header, in XDR words | |
1248 | * | |
1249 | */ | |
1250 | void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages, | |
1251 | unsigned int base, unsigned int len, | |
1252 | unsigned int hdrsize) | |
1253 | { | |
9ed5af26 | 1254 | hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign; |
02ef04e4 | 1255 | |
cf500bac | 1256 | xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len); |
c509f15a | 1257 | trace_rpc_xdr_reply_pages(req->rq_task, &req->rq_rcv_buf); |
cf500bac CL |
1258 | } |
1259 | EXPORT_SYMBOL_GPL(rpc_prepare_reply_pages); | |
1260 | ||
77de2c59 TM |
1261 | void |
1262 | rpc_call_start(struct rpc_task *task) | |
1263 | { | |
1264 | task->tk_action = call_start; | |
1265 | } | |
1266 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
1267 | ||
ed39440a CL |
1268 | /** |
1269 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
1270 | * @clnt: RPC client structure | |
1271 | * @buf: target buffer | |
65b6e42c | 1272 | * @bufsize: length of target buffer |
ed39440a CL |
1273 | * |
1274 | * Returns the number of bytes that are actually in the stored address. | |
1275 | */ | |
1276 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
1277 | { | |
1278 | size_t bytes; | |
2446ab60 TM |
1279 | struct rpc_xprt *xprt; |
1280 | ||
1281 | rcu_read_lock(); | |
1282 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 1283 | |
2446ab60 | 1284 | bytes = xprt->addrlen; |
ed39440a CL |
1285 | if (bytes > bufsize) |
1286 | bytes = bufsize; | |
2446ab60 TM |
1287 | memcpy(buf, &xprt->addr, bytes); |
1288 | rcu_read_unlock(); | |
1289 | ||
1290 | return bytes; | |
ed39440a | 1291 | } |
b86acd50 | 1292 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 1293 | |
f425eba4 CL |
1294 | /** |
1295 | * rpc_peeraddr2str - return remote peer address in printable format | |
1296 | * @clnt: RPC client structure | |
1297 | * @format: address format | |
1298 | * | |
2446ab60 TM |
1299 | * NB: the lifetime of the memory referenced by the returned pointer is |
1300 | * the same as the rpc_xprt itself. As long as the caller uses this | |
1301 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 1302 | */ |
b454ae90 CL |
1303 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
1304 | enum rpc_display_format_t format) | |
f425eba4 | 1305 | { |
2446ab60 TM |
1306 | struct rpc_xprt *xprt; |
1307 | ||
1308 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
1309 | |
1310 | if (xprt->address_strings[format] != NULL) | |
1311 | return xprt->address_strings[format]; | |
1312 | else | |
1313 | return "unprintable"; | |
f425eba4 | 1314 | } |
b86acd50 | 1315 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 1316 | |
2e738fdc CL |
1317 | static const struct sockaddr_in rpc_inaddr_loopback = { |
1318 | .sin_family = AF_INET, | |
1319 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1320 | }; | |
1321 | ||
1322 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
1323 | .sin6_family = AF_INET6, | |
1324 | .sin6_addr = IN6ADDR_ANY_INIT, | |
1325 | }; | |
1326 | ||
1327 | /* | |
1328 | * Try a getsockname() on a connected datagram socket. Using a | |
1329 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
1330 | * This conserves the ephemeral port number space. | |
1331 | * | |
1332 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1333 | * negative errno is returned. | |
1334 | */ | |
1335 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
9b2c45d4 | 1336 | struct sockaddr *buf) |
2e738fdc CL |
1337 | { |
1338 | struct socket *sock; | |
1339 | int err; | |
1340 | ||
1341 | err = __sock_create(net, sap->sa_family, | |
1342 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1343 | if (err < 0) { | |
1344 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1345 | goto out; | |
1346 | } | |
1347 | ||
1348 | switch (sap->sa_family) { | |
1349 | case AF_INET: | |
1350 | err = kernel_bind(sock, | |
1351 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1352 | sizeof(rpc_inaddr_loopback)); | |
1353 | break; | |
1354 | case AF_INET6: | |
1355 | err = kernel_bind(sock, | |
1356 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1357 | sizeof(rpc_in6addr_loopback)); | |
1358 | break; | |
1359 | default: | |
1360 | err = -EAFNOSUPPORT; | |
1361 | goto out; | |
1362 | } | |
1363 | if (err < 0) { | |
1364 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1365 | goto out_release; | |
1366 | } | |
1367 | ||
1368 | err = kernel_connect(sock, sap, salen, 0); | |
1369 | if (err < 0) { | |
1370 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1371 | goto out_release; | |
1372 | } | |
1373 | ||
9b2c45d4 | 1374 | err = kernel_getsockname(sock, buf); |
2e738fdc CL |
1375 | if (err < 0) { |
1376 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1377 | goto out_release; | |
1378 | } | |
1379 | ||
1380 | err = 0; | |
1381 | if (buf->sa_family == AF_INET6) { | |
1382 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1383 | sin6->sin6_scope_id = 0; | |
1384 | } | |
1385 | dprintk("RPC: %s succeeded\n", __func__); | |
1386 | ||
1387 | out_release: | |
1388 | sock_release(sock); | |
1389 | out: | |
1390 | return err; | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Scraping a connected socket failed, so we don't have a useable | |
1395 | * local address. Fallback: generate an address that will prevent | |
1396 | * the server from calling us back. | |
1397 | * | |
1398 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1399 | * negative errno is returned. | |
1400 | */ | |
1401 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1402 | { | |
1403 | switch (family) { | |
1404 | case AF_INET: | |
1405 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1406 | return -EINVAL; | |
1407 | memcpy(buf, &rpc_inaddr_loopback, | |
1408 | sizeof(rpc_inaddr_loopback)); | |
1409 | break; | |
1410 | case AF_INET6: | |
1411 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1412 | return -EINVAL; | |
1413 | memcpy(buf, &rpc_in6addr_loopback, | |
1414 | sizeof(rpc_in6addr_loopback)); | |
0b161e63 | 1415 | break; |
2e738fdc CL |
1416 | default: |
1417 | dprintk("RPC: %s: address family not supported\n", | |
1418 | __func__); | |
1419 | return -EAFNOSUPPORT; | |
1420 | } | |
1421 | dprintk("RPC: %s: succeeded\n", __func__); | |
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | /** | |
1426 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1427 | * @clnt: RPC client structure | |
1428 | * @buf: target buffer | |
1429 | * @buflen: size of target buffer, in bytes | |
1430 | * | |
1431 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1432 | * otherwise, a negative errno is returned. | |
1433 | * | |
1434 | * This works even if the underlying transport is not currently connected, | |
1435 | * or if the upper layer never previously provided a source address. | |
1436 | * | |
1437 | * The result of this function call is transient: multiple calls in | |
1438 | * succession may give different results, depending on how local | |
1439 | * networking configuration changes over time. | |
1440 | */ | |
1441 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1442 | { | |
1443 | struct sockaddr_storage address; | |
1444 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1445 | struct rpc_xprt *xprt; | |
1446 | struct net *net; | |
1447 | size_t salen; | |
1448 | int err; | |
1449 | ||
1450 | rcu_read_lock(); | |
1451 | xprt = rcu_dereference(clnt->cl_xprt); | |
1452 | salen = xprt->addrlen; | |
1453 | memcpy(sap, &xprt->addr, salen); | |
1454 | net = get_net(xprt->xprt_net); | |
1455 | rcu_read_unlock(); | |
1456 | ||
1457 | rpc_set_port(sap, 0); | |
9b2c45d4 | 1458 | err = rpc_sockname(net, sap, salen, buf); |
2e738fdc CL |
1459 | put_net(net); |
1460 | if (err != 0) | |
1461 | /* Couldn't discover local address, return ANYADDR */ | |
1462 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1463 | return 0; | |
1464 | } | |
1465 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1466 | ||
1da177e4 LT |
1467 | void |
1468 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1469 | { | |
2446ab60 TM |
1470 | struct rpc_xprt *xprt; |
1471 | ||
1472 | rcu_read_lock(); | |
1473 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1474 | if (xprt->ops->set_buffer_size) |
1475 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1476 | rcu_read_unlock(); |
1da177e4 | 1477 | } |
e8914c65 | 1478 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1479 | |
2446ab60 TM |
1480 | /** |
1481 | * rpc_net_ns - Get the network namespace for this RPC client | |
1482 | * @clnt: RPC client to query | |
1483 | * | |
1484 | */ | |
1485 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1486 | { | |
1487 | struct net *ret; | |
1488 | ||
1489 | rcu_read_lock(); | |
1490 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1491 | rcu_read_unlock(); | |
1492 | return ret; | |
1493 | } | |
1494 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1495 | ||
1496 | /** | |
1497 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1498 | * @clnt: RPC client to query | |
1da177e4 LT |
1499 | * |
1500 | * For stream transports, this is one RPC record fragment (see RFC | |
1501 | * 1831), as we don't support multi-record requests yet. For datagram | |
1502 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1503 | * RPC header sizes. | |
1504 | */ | |
1505 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1506 | { | |
2446ab60 TM |
1507 | size_t ret; |
1508 | ||
1509 | rcu_read_lock(); | |
1510 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1511 | rcu_read_unlock(); | |
1512 | return ret; | |
1da177e4 | 1513 | } |
b86acd50 | 1514 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1515 | |
6b26cc8c CL |
1516 | /** |
1517 | * rpc_max_bc_payload - Get maximum backchannel payload size, in bytes | |
1518 | * @clnt: RPC client to query | |
1519 | */ | |
1520 | size_t rpc_max_bc_payload(struct rpc_clnt *clnt) | |
1521 | { | |
1522 | struct rpc_xprt *xprt; | |
1523 | size_t ret; | |
1524 | ||
1525 | rcu_read_lock(); | |
1526 | xprt = rcu_dereference(clnt->cl_xprt); | |
1527 | ret = xprt->ops->bc_maxpayload(xprt); | |
1528 | rcu_read_unlock(); | |
1529 | return ret; | |
1530 | } | |
1531 | EXPORT_SYMBOL_GPL(rpc_max_bc_payload); | |
1532 | ||
7402a4fe TM |
1533 | unsigned int rpc_num_bc_slots(struct rpc_clnt *clnt) |
1534 | { | |
1535 | struct rpc_xprt *xprt; | |
1536 | unsigned int ret; | |
1537 | ||
1538 | rcu_read_lock(); | |
1539 | xprt = rcu_dereference(clnt->cl_xprt); | |
1540 | ret = xprt->ops->bc_num_slots(xprt); | |
1541 | rcu_read_unlock(); | |
1542 | return ret; | |
1543 | } | |
1544 | EXPORT_SYMBOL_GPL(rpc_num_bc_slots); | |
1545 | ||
35f5a422 CL |
1546 | /** |
1547 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1548 | * @clnt: client to rebind | |
1549 | * | |
1550 | */ | |
1551 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1552 | { | |
2446ab60 TM |
1553 | if (clnt->cl_autobind) { |
1554 | rcu_read_lock(); | |
1555 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1556 | rcu_read_unlock(); | |
1557 | } | |
35f5a422 | 1558 | } |
b86acd50 | 1559 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1560 | |
9e6fa0bb TM |
1561 | static int |
1562 | __rpc_restart_call(struct rpc_task *task, void (*action)(struct rpc_task *)) | |
aae2006e | 1563 | { |
494314c4 | 1564 | task->tk_status = 0; |
5ad64b36 | 1565 | task->tk_rpc_status = 0; |
9e6fa0bb | 1566 | task->tk_action = action; |
f1f88fc7 | 1567 | return 1; |
aae2006e | 1568 | } |
aae2006e | 1569 | |
1da177e4 LT |
1570 | /* |
1571 | * Restart an (async) RPC call. Usually called from within the | |
1572 | * exit handler. | |
1573 | */ | |
f1f88fc7 | 1574 | int |
1da177e4 LT |
1575 | rpc_restart_call(struct rpc_task *task) |
1576 | { | |
9e6fa0bb | 1577 | return __rpc_restart_call(task, call_start); |
1da177e4 | 1578 | } |
e8914c65 | 1579 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1580 | |
9e6fa0bb TM |
1581 | /* |
1582 | * Restart an (async) RPC call from the call_prepare state. | |
1583 | * Usually called from within the exit handler. | |
1584 | */ | |
1585 | int | |
1586 | rpc_restart_call_prepare(struct rpc_task *task) | |
1587 | { | |
1588 | if (task->tk_ops->rpc_call_prepare != NULL) | |
1589 | return __rpc_restart_call(task, rpc_prepare_task); | |
1590 | return rpc_restart_call(task); | |
1591 | } | |
1592 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1593 | ||
b4b9d2cc JL |
1594 | const char |
1595 | *rpc_proc_name(const struct rpc_task *task) | |
3748f1e4 CL |
1596 | { |
1597 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1598 | ||
1599 | if (proc) { | |
1600 | if (proc->p_name) | |
1601 | return proc->p_name; | |
1602 | else | |
1603 | return "NULL"; | |
1604 | } else | |
1605 | return "no proc"; | |
1606 | } | |
3748f1e4 | 1607 | |
5ad64b36 TM |
1608 | static void |
1609 | __rpc_call_rpcerror(struct rpc_task *task, int tk_status, int rpc_status) | |
1610 | { | |
0125ecbb | 1611 | trace_rpc_call_rpcerror(task, tk_status, rpc_status); |
5ad64b36 TM |
1612 | task->tk_rpc_status = rpc_status; |
1613 | rpc_exit(task, tk_status); | |
1614 | } | |
1615 | ||
1616 | static void | |
1617 | rpc_call_rpcerror(struct rpc_task *task, int status) | |
1618 | { | |
1619 | __rpc_call_rpcerror(task, status, status); | |
1620 | } | |
1621 | ||
1da177e4 LT |
1622 | /* |
1623 | * 0. Initial state | |
1624 | * | |
1625 | * Other FSM states can be visited zero or more times, but | |
1626 | * this state is visited exactly once for each RPC. | |
1627 | */ | |
1628 | static void | |
1629 | call_start(struct rpc_task *task) | |
1630 | { | |
1631 | struct rpc_clnt *clnt = task->tk_client; | |
1c5876dd | 1632 | int idx = task->tk_msg.rpc_proc->p_statidx; |
1da177e4 | 1633 | |
c435da68 | 1634 | trace_rpc_request(task); |
1da177e4 | 1635 | |
1c5876dd CH |
1636 | /* Increment call count (version might not be valid for ping) */ |
1637 | if (clnt->cl_program->version[clnt->cl_vers]) | |
1638 | clnt->cl_program->version[clnt->cl_vers]->counts[idx]++; | |
1da177e4 LT |
1639 | clnt->cl_stats->rpccnt++; |
1640 | task->tk_action = call_reserve; | |
0f90be13 | 1641 | rpc_task_set_transport(task, clnt); |
1da177e4 LT |
1642 | } |
1643 | ||
1644 | /* | |
1645 | * 1. Reserve an RPC call slot | |
1646 | */ | |
1647 | static void | |
1648 | call_reserve(struct rpc_task *task) | |
1649 | { | |
1da177e4 LT |
1650 | task->tk_status = 0; |
1651 | task->tk_action = call_reserveresult; | |
1652 | xprt_reserve(task); | |
1653 | } | |
1654 | ||
ba60eb25 TM |
1655 | static void call_retry_reserve(struct rpc_task *task); |
1656 | ||
1da177e4 LT |
1657 | /* |
1658 | * 1b. Grok the result of xprt_reserve() | |
1659 | */ | |
1660 | static void | |
1661 | call_reserveresult(struct rpc_task *task) | |
1662 | { | |
1663 | int status = task->tk_status; | |
1664 | ||
1da177e4 LT |
1665 | /* |
1666 | * After a call to xprt_reserve(), we must have either | |
1667 | * a request slot or else an error status. | |
1668 | */ | |
1669 | task->tk_status = 0; | |
1670 | if (status >= 0) { | |
1671 | if (task->tk_rqstp) { | |
f2d47d02 | 1672 | task->tk_action = call_refresh; |
1da177e4 LT |
1673 | return; |
1674 | } | |
1675 | ||
5ad64b36 | 1676 | rpc_call_rpcerror(task, -EIO); |
1da177e4 LT |
1677 | return; |
1678 | } | |
1679 | ||
1680 | /* | |
1681 | * Even though there was an error, we may have acquired | |
1682 | * a request slot somehow. Make sure not to leak it. | |
1683 | */ | |
5cd8b0d4 | 1684 | if (task->tk_rqstp) |
1da177e4 | 1685 | xprt_release(task); |
1da177e4 LT |
1686 | |
1687 | switch (status) { | |
1afeaf5c TM |
1688 | case -ENOMEM: |
1689 | rpc_delay(task, HZ >> 2); | |
df561f66 | 1690 | fallthrough; |
1da177e4 | 1691 | case -EAGAIN: /* woken up; retry */ |
ba60eb25 | 1692 | task->tk_action = call_retry_reserve; |
1da177e4 | 1693 | return; |
1da177e4 | 1694 | default: |
5cd8b0d4 | 1695 | rpc_call_rpcerror(task, status); |
1da177e4 | 1696 | } |
1da177e4 LT |
1697 | } |
1698 | ||
ba60eb25 TM |
1699 | /* |
1700 | * 1c. Retry reserving an RPC call slot | |
1701 | */ | |
1702 | static void | |
1703 | call_retry_reserve(struct rpc_task *task) | |
1704 | { | |
ba60eb25 TM |
1705 | task->tk_status = 0; |
1706 | task->tk_action = call_reserveresult; | |
1707 | xprt_retry_reserve(task); | |
1708 | } | |
1709 | ||
1da177e4 | 1710 | /* |
55576244 BF |
1711 | * 2. Bind and/or refresh the credentials |
1712 | */ | |
1713 | static void | |
1714 | call_refresh(struct rpc_task *task) | |
1715 | { | |
55576244 BF |
1716 | task->tk_action = call_refreshresult; |
1717 | task->tk_status = 0; | |
1718 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1719 | rpcauth_refreshcred(task); | |
1720 | } | |
1721 | ||
1722 | /* | |
1723 | * 2a. Process the results of a credential refresh | |
1724 | */ | |
1725 | static void | |
1726 | call_refreshresult(struct rpc_task *task) | |
1727 | { | |
1728 | int status = task->tk_status; | |
1729 | ||
55576244 | 1730 | task->tk_status = 0; |
5fc43978 | 1731 | task->tk_action = call_refresh; |
55576244 | 1732 | switch (status) { |
5fc43978 | 1733 | case 0: |
6ff33b7d | 1734 | if (rpcauth_uptodatecred(task)) { |
5fc43978 | 1735 | task->tk_action = call_allocate; |
6ff33b7d WAA |
1736 | return; |
1737 | } | |
1738 | /* Use rate-limiting and a max number of retries if refresh | |
1739 | * had status 0 but failed to update the cred. | |
1740 | */ | |
df561f66 | 1741 | fallthrough; |
55576244 BF |
1742 | case -ETIMEDOUT: |
1743 | rpc_delay(task, 3*HZ); | |
df561f66 | 1744 | fallthrough; |
5fc43978 TM |
1745 | case -EAGAIN: |
1746 | status = -EACCES; | |
df561f66 | 1747 | fallthrough; |
f1ff0c27 | 1748 | case -EKEYEXPIRED: |
5fc43978 TM |
1749 | if (!task->tk_cred_retry) |
1750 | break; | |
1751 | task->tk_cred_retry--; | |
7c8099f6 | 1752 | trace_rpc_retry_refresh_status(task); |
5fc43978 | 1753 | return; |
55576244 | 1754 | } |
7c8099f6 | 1755 | trace_rpc_refresh_status(task); |
5ad64b36 | 1756 | rpc_call_rpcerror(task, status); |
55576244 BF |
1757 | } |
1758 | ||
1759 | /* | |
1760 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1761 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1762 | */ |
1763 | static void | |
1764 | call_allocate(struct rpc_task *task) | |
1765 | { | |
2c94b8ec | 1766 | const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth; |
02107148 | 1767 | struct rpc_rqst *req = task->tk_rqstp; |
a4f0835c | 1768 | struct rpc_xprt *xprt = req->rq_xprt; |
499b4988 | 1769 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
5fe6eaa1 | 1770 | int status; |
1da177e4 | 1771 | |
2bea90d4 | 1772 | task->tk_status = 0; |
762e4e67 | 1773 | task->tk_action = call_encode; |
2bea90d4 | 1774 | |
af6b61d7 | 1775 | if (req->rq_buffer) |
1da177e4 LT |
1776 | return; |
1777 | ||
2bea90d4 CL |
1778 | if (proc->p_proc != 0) { |
1779 | BUG_ON(proc->p_arglen == 0); | |
1780 | if (proc->p_decode != NULL) | |
1781 | BUG_ON(proc->p_replen == 0); | |
1782 | } | |
1da177e4 | 1783 | |
2bea90d4 CL |
1784 | /* |
1785 | * Calculate the size (in quads) of the RPC call | |
1786 | * and reply headers, and convert both values | |
1787 | * to byte sizes. | |
1788 | */ | |
2c94b8ec CL |
1789 | req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) + |
1790 | proc->p_arglen; | |
2bea90d4 | 1791 | req->rq_callsize <<= 2; |
51314960 TM |
1792 | /* |
1793 | * Note: the reply buffer must at minimum allocate enough space | |
1794 | * for the 'struct accepted_reply' from RFC5531. | |
1795 | */ | |
1796 | req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + \ | |
1797 | max_t(size_t, proc->p_replen, 2); | |
2bea90d4 CL |
1798 | req->rq_rcvsize <<= 2; |
1799 | ||
5fe6eaa1 | 1800 | status = xprt->ops->buf_alloc(task); |
06e234c6 | 1801 | trace_rpc_buf_alloc(task, status); |
af6b61d7 | 1802 | if (status == 0) |
5fe6eaa1 CL |
1803 | return; |
1804 | if (status != -ENOMEM) { | |
5ad64b36 | 1805 | rpc_call_rpcerror(task, status); |
5fe6eaa1 CL |
1806 | return; |
1807 | } | |
46121cf7 | 1808 | |
5afa9133 | 1809 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1810 | task->tk_action = call_allocate; |
1da177e4 LT |
1811 | rpc_delay(task, HZ>>4); |
1812 | return; | |
1813 | } | |
1814 | ||
714fbc73 | 1815 | rpc_call_rpcerror(task, -ERESTARTSYS); |
1da177e4 LT |
1816 | } |
1817 | ||
7ebbbc6e | 1818 | static int |
940e3318 TM |
1819 | rpc_task_need_encode(struct rpc_task *task) |
1820 | { | |
762e4e67 TM |
1821 | return test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) == 0 && |
1822 | (!(task->tk_flags & RPC_TASK_SENT) || | |
1823 | !(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) || | |
1824 | xprt_request_need_retransmit(task)); | |
940e3318 TM |
1825 | } |
1826 | ||
1da177e4 | 1827 | static void |
b0e1c57e | 1828 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1829 | { |
1da177e4 | 1830 | struct rpc_rqst *req = task->tk_rqstp; |
e8680a24 | 1831 | struct xdr_stream xdr; |
1da177e4 | 1832 | |
b9c5bc03 CL |
1833 | xdr_buf_init(&req->rq_snd_buf, |
1834 | req->rq_buffer, | |
1835 | req->rq_callsize); | |
1836 | xdr_buf_init(&req->rq_rcv_buf, | |
68778945 | 1837 | req->rq_rbuffer, |
b9c5bc03 | 1838 | req->rq_rcvsize); |
1da177e4 | 1839 | |
cc204d01 | 1840 | req->rq_reply_bytes_recvd = 0; |
e8680a24 CL |
1841 | req->rq_snd_buf.head[0].iov_len = 0; |
1842 | xdr_init_encode(&xdr, &req->rq_snd_buf, | |
1843 | req->rq_snd_buf.head[0].iov_base, req); | |
75369089 | 1844 | xdr_free_bvec(&req->rq_snd_buf); |
e8680a24 | 1845 | if (rpc_encode_header(task, &xdr)) |
1da177e4 | 1846 | return; |
b0e1c57e | 1847 | |
e8680a24 | 1848 | task->tk_status = rpcauth_wrap_req(task, &xdr); |
1da177e4 LT |
1849 | } |
1850 | ||
762e4e67 TM |
1851 | /* |
1852 | * 3. Encode arguments of an RPC call | |
1853 | */ | |
1854 | static void | |
1855 | call_encode(struct rpc_task *task) | |
1856 | { | |
1857 | if (!rpc_task_need_encode(task)) | |
1858 | goto out; | |
6387039d | 1859 | |
cc204d01 TM |
1860 | /* Dequeue task from the receive queue while we're encoding */ |
1861 | xprt_request_dequeue_xprt(task); | |
762e4e67 TM |
1862 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
1863 | rpc_xdr_encode(task); | |
1864 | /* Did the encode result in an error condition? */ | |
1865 | if (task->tk_status != 0) { | |
1866 | /* Was the error nonfatal? */ | |
97b78ae9 TM |
1867 | switch (task->tk_status) { |
1868 | case -EAGAIN: | |
1869 | case -ENOMEM: | |
762e4e67 | 1870 | rpc_delay(task, HZ >> 4); |
97b78ae9 TM |
1871 | break; |
1872 | case -EKEYEXPIRED: | |
9c5948c2 Z |
1873 | if (!task->tk_cred_retry) { |
1874 | rpc_exit(task, task->tk_status); | |
1875 | } else { | |
1876 | task->tk_action = call_refresh; | |
1877 | task->tk_cred_retry--; | |
7c8099f6 | 1878 | trace_rpc_retry_refresh_status(task); |
9c5948c2 | 1879 | } |
97b78ae9 TM |
1880 | break; |
1881 | default: | |
5ad64b36 | 1882 | rpc_call_rpcerror(task, task->tk_status); |
97b78ae9 | 1883 | } |
762e4e67 TM |
1884 | return; |
1885 | } | |
1886 | ||
1887 | /* Add task to reply queue before transmission to avoid races */ | |
1888 | if (rpc_reply_expected(task)) | |
1889 | xprt_request_enqueue_receive(task); | |
1890 | xprt_request_enqueue_transmit(task); | |
1891 | out: | |
af6b61d7 TM |
1892 | task->tk_action = call_transmit; |
1893 | /* Check that the connection is OK */ | |
1894 | if (!xprt_bound(task->tk_xprt)) | |
1895 | task->tk_action = call_bind; | |
1896 | else if (!xprt_connected(task->tk_xprt)) | |
1897 | task->tk_action = call_connect; | |
762e4e67 TM |
1898 | } |
1899 | ||
03e51d32 TM |
1900 | /* |
1901 | * Helpers to check if the task was already transmitted, and | |
1902 | * to take action when that is the case. | |
1903 | */ | |
1904 | static bool | |
1905 | rpc_task_transmitted(struct rpc_task *task) | |
1906 | { | |
1907 | return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); | |
1908 | } | |
1909 | ||
1910 | static void | |
1911 | rpc_task_handle_transmitted(struct rpc_task *task) | |
1912 | { | |
1913 | xprt_end_transmit(task); | |
1914 | task->tk_action = call_transmit_status; | |
03e51d32 TM |
1915 | } |
1916 | ||
1da177e4 LT |
1917 | /* |
1918 | * 4. Get the server port number if not yet set | |
1919 | */ | |
1920 | static void | |
1921 | call_bind(struct rpc_task *task) | |
1922 | { | |
ad2368d6 | 1923 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1924 | |
03e51d32 TM |
1925 | if (rpc_task_transmitted(task)) { |
1926 | rpc_task_handle_transmitted(task); | |
1927 | return; | |
1928 | } | |
1929 | ||
009a82f6 TM |
1930 | if (xprt_bound(xprt)) { |
1931 | task->tk_action = call_connect; | |
009a82f6 TM |
1932 | return; |
1933 | } | |
1934 | ||
009a82f6 | 1935 | task->tk_action = call_bind_status; |
4d6c671a TM |
1936 | if (!xprt_prepare_transmit(task)) |
1937 | return; | |
1938 | ||
009a82f6 | 1939 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1940 | } |
1941 | ||
1942 | /* | |
da351878 CL |
1943 | * 4a. Sort out bind result |
1944 | */ | |
1945 | static void | |
1946 | call_bind_status(struct rpc_task *task) | |
1947 | { | |
bd736ed3 | 1948 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
906462af | 1949 | int status = -EIO; |
da351878 | 1950 | |
03e51d32 TM |
1951 | if (rpc_task_transmitted(task)) { |
1952 | rpc_task_handle_transmitted(task); | |
1953 | return; | |
1954 | } | |
1955 | ||
bd736ed3 TM |
1956 | if (task->tk_status >= 0) |
1957 | goto out_next; | |
1958 | if (xprt_bound(xprt)) { | |
da351878 | 1959 | task->tk_status = 0; |
bd736ed3 | 1960 | goto out_next; |
da351878 CL |
1961 | } |
1962 | ||
1963 | switch (task->tk_status) { | |
381ba74a | 1964 | case -ENOMEM: |
381ba74a | 1965 | rpc_delay(task, HZ >> 2); |
2429cbf6 | 1966 | goto retry_timeout; |
da351878 | 1967 | case -EACCES: |
42ebfc2c | 1968 | trace_rpcb_prog_unavail_err(task); |
b79dc8ce CL |
1969 | /* fail immediately if this is an RPC ping */ |
1970 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1971 | status = -EOPNOTSUPP; | |
1972 | break; | |
1973 | } | |
0b760113 TM |
1974 | if (task->tk_rebind_retry == 0) |
1975 | break; | |
1976 | task->tk_rebind_retry--; | |
ea635a51 | 1977 | rpc_delay(task, 3*HZ); |
da45828e | 1978 | goto retry_timeout; |
80f455da TM |
1979 | case -ENOBUFS: |
1980 | rpc_delay(task, HZ >> 2); | |
1981 | goto retry_timeout; | |
4d6c671a TM |
1982 | case -EAGAIN: |
1983 | goto retry_timeout; | |
da351878 | 1984 | case -ETIMEDOUT: |
42ebfc2c | 1985 | trace_rpcb_timeout_err(task); |
da45828e | 1986 | goto retry_timeout; |
da351878 | 1987 | case -EPFNOSUPPORT: |
906462af | 1988 | /* server doesn't support any rpcbind version we know of */ |
42ebfc2c | 1989 | trace_rpcb_bind_version_err(task); |
da351878 CL |
1990 | break; |
1991 | case -EPROTONOSUPPORT: | |
42ebfc2c | 1992 | trace_rpcb_bind_version_err(task); |
fdb63dcd | 1993 | goto retry_timeout; |
012da158 CL |
1994 | case -ECONNREFUSED: /* connection problems */ |
1995 | case -ECONNRESET: | |
df277270 | 1996 | case -ECONNABORTED: |
012da158 CL |
1997 | case -ENOTCONN: |
1998 | case -EHOSTDOWN: | |
eb5b46fa | 1999 | case -ENETDOWN: |
012da158 CL |
2000 | case -EHOSTUNREACH: |
2001 | case -ENETUNREACH: | |
2002 | case -EPIPE: | |
42ebfc2c | 2003 | trace_rpcb_unreachable_err(task); |
012da158 CL |
2004 | if (!RPC_IS_SOFTCONN(task)) { |
2005 | rpc_delay(task, 5*HZ); | |
2006 | goto retry_timeout; | |
2007 | } | |
2008 | status = task->tk_status; | |
2009 | break; | |
da351878 | 2010 | default: |
42ebfc2c | 2011 | trace_rpcb_unrecognized_err(task); |
da351878 CL |
2012 | } |
2013 | ||
5ad64b36 | 2014 | rpc_call_rpcerror(task, status); |
da351878 | 2015 | return; |
bd736ed3 TM |
2016 | out_next: |
2017 | task->tk_action = call_connect; | |
2018 | return; | |
da45828e | 2019 | retry_timeout: |
fdb63dcd | 2020 | task->tk_status = 0; |
4d6c671a | 2021 | task->tk_action = call_bind; |
cea57789 | 2022 | rpc_check_timeout(task); |
da351878 CL |
2023 | } |
2024 | ||
2025 | /* | |
2026 | * 4b. Connect to the RPC server | |
1da177e4 LT |
2027 | */ |
2028 | static void | |
2029 | call_connect(struct rpc_task *task) | |
2030 | { | |
ad2368d6 | 2031 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 2032 | |
03e51d32 TM |
2033 | if (rpc_task_transmitted(task)) { |
2034 | rpc_task_handle_transmitted(task); | |
2035 | return; | |
2036 | } | |
2037 | ||
009a82f6 TM |
2038 | if (xprt_connected(xprt)) { |
2039 | task->tk_action = call_transmit; | |
009a82f6 TM |
2040 | return; |
2041 | } | |
2042 | ||
009a82f6 TM |
2043 | task->tk_action = call_connect_status; |
2044 | if (task->tk_status < 0) | |
2045 | return; | |
2046 | if (task->tk_flags & RPC_TASK_NOCONNECT) { | |
5ad64b36 | 2047 | rpc_call_rpcerror(task, -ENOTCONN); |
009a82f6 | 2048 | return; |
1da177e4 | 2049 | } |
4d6c671a TM |
2050 | if (!xprt_prepare_transmit(task)) |
2051 | return; | |
009a82f6 | 2052 | xprt_connect(task); |
1da177e4 LT |
2053 | } |
2054 | ||
2055 | /* | |
da351878 | 2056 | * 4c. Sort out connect result |
1da177e4 LT |
2057 | */ |
2058 | static void | |
2059 | call_connect_status(struct rpc_task *task) | |
2060 | { | |
bd736ed3 | 2061 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 LT |
2062 | struct rpc_clnt *clnt = task->tk_client; |
2063 | int status = task->tk_status; | |
2064 | ||
03e51d32 TM |
2065 | if (rpc_task_transmitted(task)) { |
2066 | rpc_task_handle_transmitted(task); | |
9bd11523 TM |
2067 | return; |
2068 | } | |
2069 | ||
e671edb9 | 2070 | trace_rpc_connect_status(task); |
bd736ed3 TM |
2071 | |
2072 | if (task->tk_status == 0) { | |
2073 | clnt->cl_stats->netreconn++; | |
2074 | goto out_next; | |
2075 | } | |
2076 | if (xprt_connected(xprt)) { | |
2077 | task->tk_status = 0; | |
2078 | goto out_next; | |
2079 | } | |
2080 | ||
561ec160 | 2081 | task->tk_status = 0; |
1da177e4 | 2082 | switch (status) { |
3ed5e2a2 | 2083 | case -ECONNREFUSED: |
fd01b259 N |
2084 | /* A positive refusal suggests a rebind is needed. */ |
2085 | if (RPC_IS_SOFTCONN(task)) | |
2086 | break; | |
2087 | if (clnt->cl_autobind) { | |
2088 | rpc_force_rebind(clnt); | |
7b3fef8e | 2089 | goto out_retry; |
fd01b259 | 2090 | } |
df561f66 | 2091 | fallthrough; |
3ed5e2a2 | 2092 | case -ECONNRESET: |
df277270 | 2093 | case -ECONNABORTED: |
eb5b46fa | 2094 | case -ENETDOWN: |
3ed5e2a2 | 2095 | case -ENETUNREACH: |
df277270 | 2096 | case -EHOSTUNREACH: |
2fc193cf | 2097 | case -EPIPE: |
b8457606 | 2098 | case -EPROTO: |
2c2ee6d2 N |
2099 | xprt_conditional_disconnect(task->tk_rqstp->rq_xprt, |
2100 | task->tk_rqstp->rq_connect_cookie); | |
3ed5e2a2 TM |
2101 | if (RPC_IS_SOFTCONN(task)) |
2102 | break; | |
1fa3e2eb SD |
2103 | /* retry with existing socket, after a delay */ |
2104 | rpc_delay(task, 3*HZ); | |
df561f66 | 2105 | fallthrough; |
80f455da | 2106 | case -EADDRINUSE: |
0445f92c | 2107 | case -ENOTCONN: |
3ed5e2a2 | 2108 | case -EAGAIN: |
485f2251 | 2109 | case -ETIMEDOUT: |
7b3fef8e | 2110 | goto out_retry; |
80f455da TM |
2111 | case -ENOBUFS: |
2112 | rpc_delay(task, HZ >> 2); | |
2113 | goto out_retry; | |
1da177e4 | 2114 | } |
5ad64b36 | 2115 | rpc_call_rpcerror(task, status); |
7b3fef8e | 2116 | return; |
bd736ed3 TM |
2117 | out_next: |
2118 | task->tk_action = call_transmit; | |
2119 | return; | |
7b3fef8e TM |
2120 | out_retry: |
2121 | /* Check for timeouts before looping back to call_bind */ | |
2122 | task->tk_action = call_bind; | |
2123 | rpc_check_timeout(task); | |
1da177e4 LT |
2124 | } |
2125 | ||
2126 | /* | |
2127 | * 5. Transmit the RPC request, and wait for reply | |
2128 | */ | |
2129 | static void | |
2130 | call_transmit(struct rpc_task *task) | |
2131 | { | |
03e51d32 TM |
2132 | if (rpc_task_transmitted(task)) { |
2133 | rpc_task_handle_transmitted(task); | |
2134 | return; | |
2135 | } | |
2136 | ||
ed7dc973 | 2137 | task->tk_action = call_transmit_status; |
009a82f6 TM |
2138 | if (!xprt_prepare_transmit(task)) |
2139 | return; | |
2140 | task->tk_status = 0; | |
c544577d | 2141 | if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) { |
009a82f6 TM |
2142 | if (!xprt_connected(task->tk_xprt)) { |
2143 | task->tk_status = -ENOTCONN; | |
c544577d | 2144 | return; |
ed7dc973 | 2145 | } |
009a82f6 | 2146 | xprt_transmit(task); |
c544577d | 2147 | } |
c544577d | 2148 | xprt_end_transmit(task); |
e0ab53de TM |
2149 | } |
2150 | ||
2151 | /* | |
2152 | * 5a. Handle cleanup after a transmission | |
2153 | */ | |
2154 | static void | |
2155 | call_transmit_status(struct rpc_task *task) | |
2156 | { | |
2157 | task->tk_action = call_status; | |
206a134b CL |
2158 | |
2159 | /* | |
2160 | * Common case: success. Force the compiler to put this | |
2161 | * test first. | |
2162 | */ | |
009a82f6 | 2163 | if (rpc_task_transmitted(task)) { |
a7b1a483 TM |
2164 | task->tk_status = 0; |
2165 | xprt_request_wait_receive(task); | |
206a134b CL |
2166 | return; |
2167 | } | |
2168 | ||
15f081ca | 2169 | switch (task->tk_status) { |
15f081ca | 2170 | default: |
75891f50 | 2171 | break; |
78b576ce | 2172 | case -EBADMSG: |
762e4e67 TM |
2173 | task->tk_status = 0; |
2174 | task->tk_action = call_encode; | |
78b576ce | 2175 | break; |
15f081ca TM |
2176 | /* |
2177 | * Special cases: if we've been waiting on the | |
2178 | * socket's write_space() callback, or if the | |
2179 | * socket just returned a connection error, | |
2180 | * then hold onto the transport lock. | |
2181 | */ | |
78b576ce TM |
2182 | case -ENOBUFS: |
2183 | rpc_delay(task, HZ>>2); | |
df561f66 | 2184 | fallthrough; |
c544577d | 2185 | case -EBADSLT: |
78b576ce TM |
2186 | case -EAGAIN: |
2187 | task->tk_action = call_transmit; | |
2188 | task->tk_status = 0; | |
2189 | break; | |
15f081ca | 2190 | case -ECONNREFUSED: |
15f081ca | 2191 | case -EHOSTDOWN: |
eb5b46fa | 2192 | case -ENETDOWN: |
15f081ca TM |
2193 | case -EHOSTUNREACH: |
2194 | case -ENETUNREACH: | |
3dedbb5c | 2195 | case -EPERM: |
09a21c41 | 2196 | if (RPC_IS_SOFTCONN(task)) { |
a25a4cb3 CL |
2197 | if (!task->tk_msg.rpc_proc->p_proc) |
2198 | trace_xprt_ping(task->tk_xprt, | |
2199 | task->tk_status); | |
5ad64b36 | 2200 | rpc_call_rpcerror(task, task->tk_status); |
7b3fef8e | 2201 | return; |
09a21c41 | 2202 | } |
df561f66 | 2203 | fallthrough; |
09a21c41 | 2204 | case -ECONNRESET: |
df277270 | 2205 | case -ECONNABORTED: |
3913c78c | 2206 | case -EADDRINUSE: |
09a21c41 | 2207 | case -ENOTCONN: |
c8485e4d | 2208 | case -EPIPE: |
ed7dc973 TM |
2209 | task->tk_action = call_bind; |
2210 | task->tk_status = 0; | |
7ebbbc6e | 2211 | break; |
15f081ca | 2212 | } |
7b3fef8e | 2213 | rpc_check_timeout(task); |
1da177e4 LT |
2214 | } |
2215 | ||
9e00abc3 | 2216 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
477687e1 TM |
2217 | static void call_bc_transmit(struct rpc_task *task); |
2218 | static void call_bc_transmit_status(struct rpc_task *task); | |
2219 | ||
2220 | static void | |
2221 | call_bc_encode(struct rpc_task *task) | |
2222 | { | |
2223 | xprt_request_enqueue_transmit(task); | |
2224 | task->tk_action = call_bc_transmit; | |
2225 | } | |
2226 | ||
55ae1aab RL |
2227 | /* |
2228 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
2229 | * addition, disconnect on connectivity errors. | |
2230 | */ | |
2231 | static void | |
2232 | call_bc_transmit(struct rpc_task *task) | |
2233 | { | |
477687e1 TM |
2234 | task->tk_action = call_bc_transmit_status; |
2235 | if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) { | |
2236 | if (!xprt_prepare_transmit(task)) | |
2237 | return; | |
2238 | task->tk_status = 0; | |
2239 | xprt_transmit(task); | |
55ae1aab | 2240 | } |
477687e1 TM |
2241 | xprt_end_transmit(task); |
2242 | } | |
55ae1aab | 2243 | |
477687e1 TM |
2244 | static void |
2245 | call_bc_transmit_status(struct rpc_task *task) | |
2246 | { | |
2247 | struct rpc_rqst *req = task->tk_rqstp; | |
1193d58f | 2248 | |
a7b1a483 TM |
2249 | if (rpc_task_transmitted(task)) |
2250 | task->tk_status = 0; | |
2251 | ||
55ae1aab RL |
2252 | switch (task->tk_status) { |
2253 | case 0: | |
2254 | /* Success */ | |
eb5b46fa | 2255 | case -ENETDOWN: |
55ae1aab RL |
2256 | case -EHOSTDOWN: |
2257 | case -EHOSTUNREACH: | |
2258 | case -ENETUNREACH: | |
3832591e TM |
2259 | case -ECONNRESET: |
2260 | case -ECONNREFUSED: | |
2261 | case -EADDRINUSE: | |
2262 | case -ENOTCONN: | |
2263 | case -EPIPE: | |
2264 | break; | |
477687e1 TM |
2265 | case -ENOBUFS: |
2266 | rpc_delay(task, HZ>>2); | |
df561f66 | 2267 | fallthrough; |
477687e1 | 2268 | case -EBADSLT: |
c544577d | 2269 | case -EAGAIN: |
477687e1 TM |
2270 | task->tk_status = 0; |
2271 | task->tk_action = call_bc_transmit; | |
2272 | return; | |
55ae1aab RL |
2273 | case -ETIMEDOUT: |
2274 | /* | |
2275 | * Problem reaching the server. Disconnect and let the | |
2276 | * forechannel reestablish the connection. The server will | |
2277 | * have to retransmit the backchannel request and we'll | |
2278 | * reprocess it. Since these ops are idempotent, there's no | |
2279 | * need to cache our reply at this time. | |
2280 | */ | |
2281 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
2282 | "error: %d\n", task->tk_status); | |
a4f0835c | 2283 | xprt_conditional_disconnect(req->rq_xprt, |
55ae1aab RL |
2284 | req->rq_connect_cookie); |
2285 | break; | |
2286 | default: | |
2287 | /* | |
2288 | * We were unable to reply and will have to drop the | |
2289 | * request. The server should reconnect and retransmit. | |
2290 | */ | |
55ae1aab RL |
2291 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
2292 | "error: %d\n", task->tk_status); | |
2293 | break; | |
2294 | } | |
1193d58f | 2295 | task->tk_action = rpc_exit_task; |
55ae1aab | 2296 | } |
9e00abc3 | 2297 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 2298 | |
1da177e4 LT |
2299 | /* |
2300 | * 6. Sort out the RPC call status | |
2301 | */ | |
2302 | static void | |
2303 | call_status(struct rpc_task *task) | |
2304 | { | |
2305 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 LT |
2306 | int status; |
2307 | ||
a25a4cb3 CL |
2308 | if (!task->tk_msg.rpc_proc->p_proc) |
2309 | trace_xprt_ping(task->tk_xprt, task->tk_status); | |
2310 | ||
1da177e4 LT |
2311 | status = task->tk_status; |
2312 | if (status >= 0) { | |
2313 | task->tk_action = call_decode; | |
2314 | return; | |
2315 | } | |
2316 | ||
5753cba1 | 2317 | trace_rpc_call_status(task); |
1da177e4 LT |
2318 | task->tk_status = 0; |
2319 | switch(status) { | |
76303992 | 2320 | case -EHOSTDOWN: |
eb5b46fa | 2321 | case -ENETDOWN: |
76303992 TM |
2322 | case -EHOSTUNREACH: |
2323 | case -ENETUNREACH: | |
3dedbb5c | 2324 | case -EPERM: |
cea57789 TM |
2325 | if (RPC_IS_SOFTCONN(task)) |
2326 | goto out_exit; | |
76303992 TM |
2327 | /* |
2328 | * Delay any retries for 3 seconds, then handle as if it | |
2329 | * were a timeout. | |
2330 | */ | |
2331 | rpc_delay(task, 3*HZ); | |
df561f66 | 2332 | fallthrough; |
1da177e4 | 2333 | case -ETIMEDOUT: |
1da177e4 LT |
2334 | break; |
2335 | case -ECONNREFUSED: | |
df277270 TM |
2336 | case -ECONNRESET: |
2337 | case -ECONNABORTED: | |
ec6017d9 | 2338 | case -ENOTCONN: |
35f5a422 | 2339 | rpc_force_rebind(clnt); |
c82e5472 | 2340 | break; |
3913c78c | 2341 | case -EADDRINUSE: |
c8485e4d | 2342 | rpc_delay(task, 3*HZ); |
df561f66 | 2343 | fallthrough; |
c8485e4d | 2344 | case -EPIPE: |
1da177e4 | 2345 | case -EAGAIN: |
1da177e4 LT |
2346 | break; |
2347 | case -EIO: | |
2348 | /* shutdown or soft timeout */ | |
cea57789 | 2349 | goto out_exit; |
1da177e4 | 2350 | default: |
b6b6152c OK |
2351 | if (clnt->cl_chatty) |
2352 | printk("%s: RPC call returned error %d\n", | |
55909f21 | 2353 | clnt->cl_program->name, -status); |
cea57789 | 2354 | goto out_exit; |
1da177e4 | 2355 | } |
cea57789 | 2356 | task->tk_action = call_encode; |
88428cc4 OK |
2357 | if (status != -ECONNRESET && status != -ECONNABORTED) |
2358 | rpc_check_timeout(task); | |
cea57789 TM |
2359 | return; |
2360 | out_exit: | |
5ad64b36 | 2361 | rpc_call_rpcerror(task, status); |
1da177e4 LT |
2362 | } |
2363 | ||
d84dd3fb TM |
2364 | static bool |
2365 | rpc_check_connected(const struct rpc_rqst *req) | |
2366 | { | |
2367 | /* No allocated request or transport? return true */ | |
2368 | if (!req || !req->rq_xprt) | |
2369 | return true; | |
2370 | return xprt_connected(req->rq_xprt); | |
2371 | } | |
2372 | ||
1da177e4 | 2373 | static void |
7b3fef8e | 2374 | rpc_check_timeout(struct rpc_task *task) |
1da177e4 LT |
2375 | { |
2376 | struct rpc_clnt *clnt = task->tk_client; | |
2377 | ||
ce99aa62 CL |
2378 | if (RPC_SIGNALLED(task)) { |
2379 | rpc_call_rpcerror(task, -ERESTARTSYS); | |
2380 | return; | |
2381 | } | |
2382 | ||
7b3fef8e TM |
2383 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) |
2384 | return; | |
1da177e4 | 2385 | |
914cdcc7 | 2386 | trace_rpc_timeout_status(task); |
ef759a2e CL |
2387 | task->tk_timeouts++; |
2388 | ||
d84dd3fb | 2389 | if (RPC_IS_SOFTCONN(task) && !rpc_check_connected(task->tk_rqstp)) { |
5ad64b36 | 2390 | rpc_call_rpcerror(task, -ETIMEDOUT); |
3a28becc CL |
2391 | return; |
2392 | } | |
d84dd3fb | 2393 | |
1da177e4 | 2394 | if (RPC_IS_SOFT(task)) { |
e4ec48d3 TM |
2395 | /* |
2396 | * Once a "no retrans timeout" soft tasks (a.k.a NFSv4) has | |
2397 | * been sent, it should time out only if the transport | |
2398 | * connection gets terminally broken. | |
2399 | */ | |
2400 | if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) && | |
2401 | rpc_check_connected(task->tk_rqstp)) | |
2402 | return; | |
2403 | ||
cac5d07e | 2404 | if (clnt->cl_chatty) { |
0729d995 TM |
2405 | pr_notice_ratelimited( |
2406 | "%s: server %s not responding, timed out\n", | |
55909f21 | 2407 | clnt->cl_program->name, |
fb43d172 | 2408 | task->tk_xprt->servername); |
cac5d07e | 2409 | } |
7494d00c | 2410 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
5ad64b36 | 2411 | rpc_call_rpcerror(task, -ETIMEDOUT); |
7494d00c | 2412 | else |
5ad64b36 | 2413 | __rpc_call_rpcerror(task, -EIO, -ETIMEDOUT); |
1da177e4 LT |
2414 | return; |
2415 | } | |
2416 | ||
f518e35a | 2417 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 2418 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 | 2419 | if (clnt->cl_chatty) { |
0729d995 TM |
2420 | pr_notice_ratelimited( |
2421 | "%s: server %s not responding, still trying\n", | |
2422 | clnt->cl_program->name, | |
2423 | task->tk_xprt->servername); | |
4e0038b6 | 2424 | } |
1da177e4 | 2425 | } |
35f5a422 | 2426 | rpc_force_rebind(clnt); |
b48633bd TM |
2427 | /* |
2428 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
2429 | * event? RFC2203 requires the server to drop all such requests. | |
2430 | */ | |
2431 | rpcauth_invalcred(task); | |
7b3fef8e | 2432 | } |
1da177e4 | 2433 | |
1da177e4 LT |
2434 | /* |
2435 | * 7. Decode the RPC reply | |
2436 | */ | |
2437 | static void | |
2438 | call_decode(struct rpc_task *task) | |
2439 | { | |
2440 | struct rpc_clnt *clnt = task->tk_client; | |
2441 | struct rpc_rqst *req = task->tk_rqstp; | |
a0584ee9 | 2442 | struct xdr_stream xdr; |
9ba82886 | 2443 | int err; |
1da177e4 | 2444 | |
a0584ee9 | 2445 | if (!task->tk_msg.rpc_proc->p_decode) { |
9ee94d3e TM |
2446 | task->tk_action = rpc_exit_task; |
2447 | return; | |
2448 | } | |
2449 | ||
f518e35a | 2450 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 | 2451 | if (clnt->cl_chatty) { |
0729d995 | 2452 | pr_notice_ratelimited("%s: server %s OK\n", |
55909f21 | 2453 | clnt->cl_program->name, |
fb43d172 | 2454 | task->tk_xprt->servername); |
4e0038b6 | 2455 | } |
1da177e4 LT |
2456 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
2457 | } | |
2458 | ||
9ba82886 TM |
2459 | /* |
2460 | * Did we ever call xprt_complete_rqst()? If not, we should assume | |
2461 | * the message is incomplete. | |
2462 | */ | |
2463 | err = -EAGAIN; | |
2464 | if (!req->rq_reply_bytes_recvd) | |
2465 | goto out; | |
2466 | ||
f8f7e0fb BL |
2467 | /* Ensure that we see all writes made by xprt_complete_rqst() |
2468 | * before it changed req->rq_reply_bytes_recvd. | |
2469 | */ | |
2470 | smp_rmb(); | |
2471 | ||
1da177e4 | 2472 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
c509f15a | 2473 | trace_rpc_xdr_recvfrom(task, &req->rq_rcv_buf); |
1da177e4 LT |
2474 | |
2475 | /* Check that the softirq receive buffer is valid */ | |
2476 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
2477 | sizeof(req->rq_rcv_buf)) != 0); | |
2478 | ||
a0584ee9 CL |
2479 | xdr_init_decode(&xdr, &req->rq_rcv_buf, |
2480 | req->rq_rcv_buf.head[0].iov_base, req); | |
9ba82886 TM |
2481 | err = rpc_decode_header(task, &xdr); |
2482 | out: | |
2483 | switch (err) { | |
a0584ee9 CL |
2484 | case 0: |
2485 | task->tk_action = rpc_exit_task; | |
2486 | task->tk_status = rpcauth_unwrap_resp(task, &xdr); | |
abbcf28f | 2487 | return; |
a0584ee9 | 2488 | case -EAGAIN: |
a0584ee9 | 2489 | task->tk_status = 0; |
7987b694 TM |
2490 | if (task->tk_client->cl_discrtry) |
2491 | xprt_conditional_disconnect(req->rq_xprt, | |
2492 | req->rq_connect_cookie); | |
cea57789 TM |
2493 | task->tk_action = call_encode; |
2494 | rpc_check_timeout(task); | |
7987b694 TM |
2495 | break; |
2496 | case -EKEYREJECTED: | |
2497 | task->tk_action = call_reserve; | |
2498 | rpc_check_timeout(task); | |
2499 | rpcauth_invalcred(task); | |
2500 | /* Ensure we obtain a new XID if we retry! */ | |
2501 | xprt_release(task); | |
24b74bf0 | 2502 | } |
1da177e4 LT |
2503 | } |
2504 | ||
e8680a24 CL |
2505 | static int |
2506 | rpc_encode_header(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 LT |
2507 | { |
2508 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2509 | struct rpc_rqst *req = task->tk_rqstp; |
e8680a24 CL |
2510 | __be32 *p; |
2511 | int error; | |
2512 | ||
2513 | error = -EMSGSIZE; | |
2514 | p = xdr_reserve_space(xdr, RPC_CALLHDRSIZE << 2); | |
2515 | if (!p) | |
2516 | goto out_fail; | |
2517 | *p++ = req->rq_xid; | |
2518 | *p++ = rpc_call; | |
2519 | *p++ = cpu_to_be32(RPC_VERSION); | |
2520 | *p++ = cpu_to_be32(clnt->cl_prog); | |
2521 | *p++ = cpu_to_be32(clnt->cl_vers); | |
2522 | *p = cpu_to_be32(task->tk_msg.rpc_proc->p_proc); | |
2523 | ||
2524 | error = rpcauth_marshcred(task, xdr); | |
2525 | if (error < 0) | |
2526 | goto out_fail; | |
2527 | return 0; | |
2528 | out_fail: | |
2529 | trace_rpc_bad_callhdr(task); | |
714fbc73 | 2530 | rpc_call_rpcerror(task, error); |
e8680a24 | 2531 | return error; |
1da177e4 LT |
2532 | } |
2533 | ||
a0584ee9 CL |
2534 | static noinline int |
2535 | rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 | 2536 | { |
4e0038b6 | 2537 | struct rpc_clnt *clnt = task->tk_client; |
eb90a16e | 2538 | int error; |
a0584ee9 | 2539 | __be32 *p; |
1da177e4 | 2540 | |
7f5667a5 CL |
2541 | /* RFC-1014 says that the representation of XDR data must be a |
2542 | * multiple of four bytes | |
2543 | * - if it isn't pointer subtraction in the NFS client may give | |
2544 | * undefined results | |
2545 | */ | |
2546 | if (task->tk_rqstp->rq_rcv_buf.len & 3) | |
eb90a16e | 2547 | goto out_unparsable; |
1da177e4 | 2548 | |
a0584ee9 CL |
2549 | p = xdr_inline_decode(xdr, 3 * sizeof(*p)); |
2550 | if (!p) | |
2551 | goto out_unparsable; | |
7f5667a5 CL |
2552 | p++; /* skip XID */ |
2553 | if (*p++ != rpc_reply) | |
2554 | goto out_unparsable; | |
2555 | if (*p++ != rpc_msg_accepted) | |
2556 | goto out_msg_denied; | |
f4a2e418 | 2557 | |
a0584ee9 CL |
2558 | error = rpcauth_checkverf(task, xdr); |
2559 | if (error) | |
7f5667a5 CL |
2560 | goto out_verifier; |
2561 | ||
a0584ee9 CL |
2562 | p = xdr_inline_decode(xdr, sizeof(*p)); |
2563 | if (!p) | |
7f5667a5 | 2564 | goto out_unparsable; |
a0584ee9 | 2565 | switch (*p) { |
7f5667a5 | 2566 | case rpc_success: |
a0584ee9 | 2567 | return 0; |
7f5667a5 CL |
2568 | case rpc_prog_unavail: |
2569 | trace_rpc__prog_unavail(task); | |
cdf47706 AG |
2570 | error = -EPFNOSUPPORT; |
2571 | goto out_err; | |
7f5667a5 CL |
2572 | case rpc_prog_mismatch: |
2573 | trace_rpc__prog_mismatch(task); | |
cdf47706 AG |
2574 | error = -EPROTONOSUPPORT; |
2575 | goto out_err; | |
7f5667a5 CL |
2576 | case rpc_proc_unavail: |
2577 | trace_rpc__proc_unavail(task); | |
cdf47706 AG |
2578 | error = -EOPNOTSUPP; |
2579 | goto out_err; | |
7f5667a5 | 2580 | case rpc_garbage_args: |
928d42f7 | 2581 | case rpc_system_err: |
7f5667a5 | 2582 | trace_rpc__garbage_args(task); |
eb90a16e | 2583 | error = -EIO; |
7f5667a5 | 2584 | break; |
1da177e4 | 2585 | default: |
eb90a16e | 2586 | goto out_unparsable; |
1da177e4 LT |
2587 | } |
2588 | ||
abbcf28f | 2589 | out_garbage: |
4e0038b6 | 2590 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2591 | if (task->tk_garb_retry) { |
2592 | task->tk_garb_retry--; | |
762e4e67 | 2593 | task->tk_action = call_encode; |
a0584ee9 | 2594 | return -EAGAIN; |
1da177e4 | 2595 | } |
1da177e4 | 2596 | out_err: |
714fbc73 | 2597 | rpc_call_rpcerror(task, error); |
a0584ee9 | 2598 | return error; |
7f5667a5 | 2599 | |
7f5667a5 CL |
2600 | out_unparsable: |
2601 | trace_rpc__unparsable(task); | |
2602 | error = -EIO; | |
abbcf28f | 2603 | goto out_garbage; |
7f5667a5 CL |
2604 | |
2605 | out_verifier: | |
2606 | trace_rpc_bad_verifier(task); | |
7f5667a5 CL |
2607 | goto out_garbage; |
2608 | ||
2609 | out_msg_denied: | |
eb90a16e | 2610 | error = -EACCES; |
a0584ee9 CL |
2611 | p = xdr_inline_decode(xdr, sizeof(*p)); |
2612 | if (!p) | |
2613 | goto out_unparsable; | |
7f5667a5 CL |
2614 | switch (*p++) { |
2615 | case rpc_auth_error: | |
2616 | break; | |
2617 | case rpc_mismatch: | |
2618 | trace_rpc__mismatch(task); | |
2619 | error = -EPROTONOSUPPORT; | |
2620 | goto out_err; | |
2621 | default: | |
eb90a16e | 2622 | goto out_unparsable; |
7f5667a5 CL |
2623 | } |
2624 | ||
a0584ee9 CL |
2625 | p = xdr_inline_decode(xdr, sizeof(*p)); |
2626 | if (!p) | |
2627 | goto out_unparsable; | |
7f5667a5 CL |
2628 | switch (*p++) { |
2629 | case rpc_autherr_rejectedcred: | |
2630 | case rpc_autherr_rejectedverf: | |
2631 | case rpcsec_gsserr_credproblem: | |
2632 | case rpcsec_gsserr_ctxproblem: | |
2633 | if (!task->tk_cred_retry) | |
2634 | break; | |
2635 | task->tk_cred_retry--; | |
2636 | trace_rpc__stale_creds(task); | |
7987b694 | 2637 | return -EKEYREJECTED; |
7f5667a5 CL |
2638 | case rpc_autherr_badcred: |
2639 | case rpc_autherr_badverf: | |
2640 | /* possibly garbled cred/verf? */ | |
2641 | if (!task->tk_garb_retry) | |
2642 | break; | |
2643 | task->tk_garb_retry--; | |
2644 | trace_rpc__bad_creds(task); | |
2645 | task->tk_action = call_encode; | |
a0584ee9 | 2646 | return -EAGAIN; |
7f5667a5 CL |
2647 | case rpc_autherr_tooweak: |
2648 | trace_rpc__auth_tooweak(task); | |
2649 | pr_warn("RPC: server %s requires stronger authentication.\n", | |
2650 | task->tk_xprt->servername); | |
2651 | break; | |
2652 | default: | |
eb90a16e | 2653 | goto out_unparsable; |
7f5667a5 CL |
2654 | } |
2655 | goto out_err; | |
1da177e4 | 2656 | } |
5ee0ed7d | 2657 | |
c512f36b CH |
2658 | static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr, |
2659 | const void *obj) | |
5ee0ed7d | 2660 | { |
5ee0ed7d TM |
2661 | } |
2662 | ||
73c8dc13 CH |
2663 | static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr, |
2664 | void *obj) | |
5ee0ed7d TM |
2665 | { |
2666 | return 0; | |
2667 | } | |
2668 | ||
499b4988 | 2669 | static const struct rpc_procinfo rpcproc_null = { |
5ee0ed7d TM |
2670 | .p_encode = rpcproc_encode_null, |
2671 | .p_decode = rpcproc_decode_null, | |
2672 | }; | |
2673 | ||
caabea8a | 2674 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2675 | { |
2676 | struct rpc_message msg = { | |
2677 | .rpc_proc = &rpcproc_null, | |
2678 | }; | |
2679 | int err; | |
a68a72e1 N |
2680 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN | |
2681 | RPC_TASK_NULLCREDS); | |
5ee0ed7d TM |
2682 | return err; |
2683 | } | |
188fef11 | 2684 | |
7f554890 TM |
2685 | static |
2686 | struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt, | |
2687 | struct rpc_xprt *xprt, struct rpc_cred *cred, int flags, | |
2688 | const struct rpc_call_ops *ops, void *data) | |
5e1550d6 TM |
2689 | { |
2690 | struct rpc_message msg = { | |
2691 | .rpc_proc = &rpcproc_null, | |
5e1550d6 | 2692 | }; |
84115e1c TM |
2693 | struct rpc_task_setup task_setup_data = { |
2694 | .rpc_client = clnt, | |
7f554890 | 2695 | .rpc_xprt = xprt, |
84115e1c | 2696 | .rpc_message = &msg, |
1de7eea9 | 2697 | .rpc_op_cred = cred, |
7f554890 TM |
2698 | .callback_ops = (ops != NULL) ? ops : &rpc_default_ops, |
2699 | .callback_data = data, | |
841a2ed9 CL |
2700 | .flags = flags | RPC_TASK_SOFT | RPC_TASK_SOFTCONN | |
2701 | RPC_TASK_NULLCREDS, | |
84115e1c | 2702 | }; |
7f554890 | 2703 | |
c970aa85 | 2704 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2705 | } |
7f554890 TM |
2706 | |
2707 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) | |
2708 | { | |
2709 | return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL); | |
2710 | } | |
e8914c65 | 2711 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2712 | |
7f554890 TM |
2713 | struct rpc_cb_add_xprt_calldata { |
2714 | struct rpc_xprt_switch *xps; | |
2715 | struct rpc_xprt *xprt; | |
2716 | }; | |
2717 | ||
2718 | static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata) | |
2719 | { | |
2720 | struct rpc_cb_add_xprt_calldata *data = calldata; | |
2721 | ||
2722 | if (task->tk_status == 0) | |
2723 | rpc_xprt_switch_add_xprt(data->xps, data->xprt); | |
2724 | } | |
2725 | ||
2726 | static void rpc_cb_add_xprt_release(void *calldata) | |
2727 | { | |
2728 | struct rpc_cb_add_xprt_calldata *data = calldata; | |
2729 | ||
2730 | xprt_put(data->xprt); | |
2731 | xprt_switch_put(data->xps); | |
2732 | kfree(data); | |
2733 | } | |
2734 | ||
ce272302 | 2735 | static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = { |
7f554890 TM |
2736 | .rpc_call_done = rpc_cb_add_xprt_done, |
2737 | .rpc_release = rpc_cb_add_xprt_release, | |
2738 | }; | |
2739 | ||
2740 | /** | |
2741 | * rpc_clnt_test_and_add_xprt - Test and add a new transport to a rpc_clnt | |
2742 | * @clnt: pointer to struct rpc_clnt | |
2743 | * @xps: pointer to struct rpc_xprt_switch, | |
2744 | * @xprt: pointer struct rpc_xprt | |
2745 | * @dummy: unused | |
2746 | */ | |
2747 | int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt, | |
2748 | struct rpc_xprt_switch *xps, struct rpc_xprt *xprt, | |
2749 | void *dummy) | |
2750 | { | |
2751 | struct rpc_cb_add_xprt_calldata *data; | |
7f554890 TM |
2752 | struct rpc_task *task; |
2753 | ||
2754 | data = kmalloc(sizeof(*data), GFP_NOFS); | |
2755 | if (!data) | |
2756 | return -ENOMEM; | |
2757 | data->xps = xprt_switch_get(xps); | |
2758 | data->xprt = xprt_get(xprt); | |
612b41f8 TM |
2759 | if (rpc_xprt_switch_has_addr(data->xps, (struct sockaddr *)&xprt->addr)) { |
2760 | rpc_cb_add_xprt_release(data); | |
2761 | goto success; | |
2762 | } | |
7f554890 | 2763 | |
841a2ed9 | 2764 | task = rpc_call_null_helper(clnt, xprt, NULL, RPC_TASK_ASYNC, |
7f554890 | 2765 | &rpc_cb_add_xprt_call_ops, data); |
efe57fd5 | 2766 | |
7f554890 | 2767 | rpc_put_task(task); |
612b41f8 | 2768 | success: |
7f554890 TM |
2769 | return 1; |
2770 | } | |
2771 | EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt); | |
2772 | ||
fda0ab41 AA |
2773 | /** |
2774 | * rpc_clnt_setup_test_and_add_xprt() | |
2775 | * | |
2776 | * This is an rpc_clnt_add_xprt setup() function which returns 1 so: | |
2777 | * 1) caller of the test function must dereference the rpc_xprt_switch | |
2778 | * and the rpc_xprt. | |
2779 | * 2) test function must call rpc_xprt_switch_add_xprt, usually in | |
2780 | * the rpc_call_done routine. | |
2781 | * | |
2782 | * Upon success (return of 1), the test function adds the new | |
2783 | * transport to the rpc_clnt xprt switch | |
2784 | * | |
2785 | * @clnt: struct rpc_clnt to get the new transport | |
2786 | * @xps: the rpc_xprt_switch to hold the new transport | |
2787 | * @xprt: the rpc_xprt to test | |
2788 | * @data: a struct rpc_add_xprt_test pointer that holds the test function | |
2789 | * and test function call data | |
2790 | */ | |
2791 | int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt, | |
2792 | struct rpc_xprt_switch *xps, | |
2793 | struct rpc_xprt *xprt, | |
2794 | void *data) | |
2795 | { | |
fda0ab41 AA |
2796 | struct rpc_task *task; |
2797 | struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data; | |
2798 | int status = -EADDRINUSE; | |
2799 | ||
2800 | xprt = xprt_get(xprt); | |
2801 | xprt_switch_get(xps); | |
2802 | ||
2803 | if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr)) | |
2804 | goto out_err; | |
2805 | ||
2806 | /* Test the connection */ | |
841a2ed9 | 2807 | task = rpc_call_null_helper(clnt, xprt, NULL, 0, NULL, NULL); |
fda0ab41 AA |
2808 | if (IS_ERR(task)) { |
2809 | status = PTR_ERR(task); | |
2810 | goto out_err; | |
2811 | } | |
2812 | status = task->tk_status; | |
2813 | rpc_put_task(task); | |
2814 | ||
2815 | if (status < 0) | |
2816 | goto out_err; | |
2817 | ||
2818 | /* rpc_xprt_switch and rpc_xprt are deferrenced by add_xprt_test() */ | |
2819 | xtest->add_xprt_test(clnt, xprt, xtest->data); | |
2820 | ||
10e037d1 S |
2821 | xprt_put(xprt); |
2822 | xprt_switch_put(xps); | |
2823 | ||
fda0ab41 AA |
2824 | /* so that rpc_clnt_add_xprt does not call rpc_xprt_switch_add_xprt */ |
2825 | return 1; | |
2826 | out_err: | |
2827 | xprt_put(xprt); | |
2828 | xprt_switch_put(xps); | |
2829 | pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n", | |
2830 | status, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2831 | return status; | |
2832 | } | |
2833 | EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt); | |
2834 | ||
7f554890 TM |
2835 | /** |
2836 | * rpc_clnt_add_xprt - Add a new transport to a rpc_clnt | |
2837 | * @clnt: pointer to struct rpc_clnt | |
2838 | * @xprtargs: pointer to struct xprt_create | |
2839 | * @setup: callback to test and/or set up the connection | |
2840 | * @data: pointer to setup function data | |
2841 | * | |
2842 | * Creates a new transport using the parameters set in args and | |
2843 | * adds it to clnt. | |
2844 | * If ping is set, then test that connectivity succeeds before | |
2845 | * adding the new transport. | |
2846 | * | |
2847 | */ | |
2848 | int rpc_clnt_add_xprt(struct rpc_clnt *clnt, | |
2849 | struct xprt_create *xprtargs, | |
2850 | int (*setup)(struct rpc_clnt *, | |
2851 | struct rpc_xprt_switch *, | |
2852 | struct rpc_xprt *, | |
2853 | void *), | |
2854 | void *data) | |
2855 | { | |
2856 | struct rpc_xprt_switch *xps; | |
2857 | struct rpc_xprt *xprt; | |
7196dbb0 | 2858 | unsigned long connect_timeout; |
3851f1cd | 2859 | unsigned long reconnect_timeout; |
e6237b6f | 2860 | unsigned char resvport, reuseport; |
7f554890 TM |
2861 | int ret = 0; |
2862 | ||
2863 | rcu_read_lock(); | |
2864 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); | |
2865 | xprt = xprt_iter_xprt(&clnt->cl_xpi); | |
2866 | if (xps == NULL || xprt == NULL) { | |
2867 | rcu_read_unlock(); | |
b9622614 | 2868 | xprt_switch_put(xps); |
7f554890 TM |
2869 | return -EAGAIN; |
2870 | } | |
2871 | resvport = xprt->resvport; | |
e6237b6f | 2872 | reuseport = xprt->reuseport; |
7196dbb0 | 2873 | connect_timeout = xprt->connect_timeout; |
3851f1cd | 2874 | reconnect_timeout = xprt->max_reconnect_timeout; |
7f554890 TM |
2875 | rcu_read_unlock(); |
2876 | ||
2877 | xprt = xprt_create_transport(xprtargs); | |
2878 | if (IS_ERR(xprt)) { | |
2879 | ret = PTR_ERR(xprt); | |
2880 | goto out_put_switch; | |
2881 | } | |
2882 | xprt->resvport = resvport; | |
e6237b6f | 2883 | xprt->reuseport = reuseport; |
7196dbb0 TM |
2884 | if (xprt->ops->set_connect_timeout != NULL) |
2885 | xprt->ops->set_connect_timeout(xprt, | |
2886 | connect_timeout, | |
2887 | reconnect_timeout); | |
7f554890 TM |
2888 | |
2889 | rpc_xprt_switch_set_roundrobin(xps); | |
2890 | if (setup) { | |
2891 | ret = setup(clnt, xps, xprt, data); | |
2892 | if (ret != 0) | |
2893 | goto out_put_xprt; | |
2894 | } | |
2895 | rpc_xprt_switch_add_xprt(xps, xprt); | |
2896 | out_put_xprt: | |
2897 | xprt_put(xprt); | |
2898 | out_put_switch: | |
2899 | xprt_switch_put(xps); | |
2900 | return ret; | |
2901 | } | |
2902 | EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt); | |
2903 | ||
7196dbb0 TM |
2904 | struct connect_timeout_data { |
2905 | unsigned long connect_timeout; | |
2906 | unsigned long reconnect_timeout; | |
2907 | }; | |
2908 | ||
8d480326 | 2909 | static int |
7196dbb0 | 2910 | rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt, |
8d480326 TM |
2911 | struct rpc_xprt *xprt, |
2912 | void *data) | |
2913 | { | |
7196dbb0 | 2914 | struct connect_timeout_data *timeo = data; |
8d480326 | 2915 | |
7196dbb0 TM |
2916 | if (xprt->ops->set_connect_timeout) |
2917 | xprt->ops->set_connect_timeout(xprt, | |
2918 | timeo->connect_timeout, | |
2919 | timeo->reconnect_timeout); | |
8d480326 TM |
2920 | return 0; |
2921 | } | |
2922 | ||
2923 | void | |
26ae102f TM |
2924 | rpc_set_connect_timeout(struct rpc_clnt *clnt, |
2925 | unsigned long connect_timeout, | |
2926 | unsigned long reconnect_timeout) | |
8d480326 | 2927 | { |
7196dbb0 | 2928 | struct connect_timeout_data timeout = { |
26ae102f TM |
2929 | .connect_timeout = connect_timeout, |
2930 | .reconnect_timeout = reconnect_timeout, | |
7196dbb0 | 2931 | }; |
8d480326 | 2932 | rpc_clnt_iterate_for_each_xprt(clnt, |
7196dbb0 TM |
2933 | rpc_xprt_set_connect_timeout, |
2934 | &timeout); | |
8d480326 | 2935 | } |
26ae102f | 2936 | EXPORT_SYMBOL_GPL(rpc_set_connect_timeout); |
8d480326 | 2937 | |
3b58a8a9 AA |
2938 | void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt) |
2939 | { | |
bb29dd84 | 2940 | rcu_read_lock(); |
3b58a8a9 | 2941 | xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); |
bb29dd84 | 2942 | rcu_read_unlock(); |
3b58a8a9 AA |
2943 | } |
2944 | EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put); | |
2945 | ||
dd691717 AA |
2946 | void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) |
2947 | { | |
bb29dd84 | 2948 | rcu_read_lock(); |
dd691717 AA |
2949 | rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch), |
2950 | xprt); | |
bb29dd84 | 2951 | rcu_read_unlock(); |
dd691717 AA |
2952 | } |
2953 | EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt); | |
2954 | ||
39e5d2df AA |
2955 | bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt, |
2956 | const struct sockaddr *sap) | |
2957 | { | |
2958 | struct rpc_xprt_switch *xps; | |
2959 | bool ret; | |
2960 | ||
39e5d2df | 2961 | rcu_read_lock(); |
bb29dd84 | 2962 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); |
39e5d2df AA |
2963 | ret = rpc_xprt_switch_has_addr(xps, sap); |
2964 | rcu_read_unlock(); | |
2965 | return ret; | |
2966 | } | |
2967 | EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr); | |
2968 | ||
f895b252 | 2969 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
68a23ee9 CL |
2970 | static void rpc_show_header(void) |
2971 | { | |
cb3997b5 CL |
2972 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2973 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2974 | } |
2975 | ||
38e886e0 CL |
2976 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2977 | const struct rpc_task *task) | |
2978 | { | |
2979 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2980 | |
2981 | if (RPC_IS_QUEUED(task)) | |
2982 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2983 | ||
b3bcedad | 2984 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 | 2985 | task->tk_pid, task->tk_flags, task->tk_status, |
5efd1876 | 2986 | clnt, task->tk_rqstp, rpc_task_timeout(task), task->tk_ops, |
55909f21 | 2987 | clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), |
b3bcedad | 2988 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2989 | } |
2990 | ||
70abc49b | 2991 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2992 | { |
2993 | struct rpc_clnt *clnt; | |
38e886e0 | 2994 | struct rpc_task *task; |
68a23ee9 | 2995 | int header = 0; |
70abc49b | 2996 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2997 | |
70abc49b SK |
2998 | spin_lock(&sn->rpc_client_lock); |
2999 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 3000 | spin_lock(&clnt->cl_lock); |
38e886e0 | 3001 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
3002 | if (!header) { |
3003 | rpc_show_header(); | |
3004 | header++; | |
3005 | } | |
38e886e0 | 3006 | rpc_show_task(clnt, task); |
188fef11 TM |
3007 | } |
3008 | spin_unlock(&clnt->cl_lock); | |
3009 | } | |
70abc49b | 3010 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
3011 | } |
3012 | #endif | |
3c87ef6e JL |
3013 | |
3014 | #if IS_ENABLED(CONFIG_SUNRPC_SWAP) | |
15001e5a TM |
3015 | static int |
3016 | rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt, | |
3017 | struct rpc_xprt *xprt, | |
3018 | void *dummy) | |
3019 | { | |
3020 | return xprt_enable_swap(xprt); | |
3021 | } | |
3022 | ||
3c87ef6e JL |
3023 | int |
3024 | rpc_clnt_swap_activate(struct rpc_clnt *clnt) | |
3025 | { | |
15001e5a TM |
3026 | if (atomic_inc_return(&clnt->cl_swapper) == 1) |
3027 | return rpc_clnt_iterate_for_each_xprt(clnt, | |
3028 | rpc_clnt_swap_activate_callback, NULL); | |
3029 | return 0; | |
3c87ef6e JL |
3030 | } |
3031 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate); | |
3032 | ||
15001e5a TM |
3033 | static int |
3034 | rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt, | |
3035 | struct rpc_xprt *xprt, | |
3036 | void *dummy) | |
3037 | { | |
3038 | xprt_disable_swap(xprt); | |
3039 | return 0; | |
3040 | } | |
3041 | ||
3c87ef6e JL |
3042 | void |
3043 | rpc_clnt_swap_deactivate(struct rpc_clnt *clnt) | |
3044 | { | |
15001e5a TM |
3045 | if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) |
3046 | rpc_clnt_iterate_for_each_xprt(clnt, | |
3047 | rpc_clnt_swap_deactivate_callback, NULL); | |
3c87ef6e JL |
3048 | } |
3049 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate); | |
3050 | #endif /* CONFIG_SUNRPC_SWAP */ |