Commit | Line | Data |
---|---|---|
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" |
c5a382eb | 44 | #include "sysfs.h" |
70abc49b | 45 | #include "netns.h" |
1da177e4 | 46 | |
f895b252 | 47 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
48 | # define RPCDBG_FACILITY RPCDBG_CALL |
49 | #endif | |
50 | ||
188fef11 TM |
51 | /* |
52 | * All RPC clients are linked into this list | |
53 | */ | |
188fef11 | 54 | |
1da177e4 LT |
55 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
56 | ||
57 | ||
58 | static void call_start(struct rpc_task *task); | |
59 | static void call_reserve(struct rpc_task *task); | |
60 | static void call_reserveresult(struct rpc_task *task); | |
61 | static void call_allocate(struct rpc_task *task); | |
762e4e67 | 62 | static void call_encode(struct rpc_task *task); |
1da177e4 LT |
63 | static void call_decode(struct rpc_task *task); |
64 | static void call_bind(struct rpc_task *task); | |
da351878 | 65 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
66 | static void call_transmit(struct rpc_task *task); |
67 | static void call_status(struct rpc_task *task); | |
940e3318 | 68 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
69 | static void call_refresh(struct rpc_task *task); |
70 | static void call_refreshresult(struct rpc_task *task); | |
1da177e4 LT |
71 | static void call_connect(struct rpc_task *task); |
72 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 73 | |
e8680a24 CL |
74 | static int rpc_encode_header(struct rpc_task *task, |
75 | struct xdr_stream *xdr); | |
a0584ee9 CL |
76 | static int rpc_decode_header(struct rpc_task *task, |
77 | struct xdr_stream *xdr); | |
caabea8a | 78 | static int rpc_ping(struct rpc_clnt *clnt); |
fd13359f | 79 | static int rpc_ping_noreply(struct rpc_clnt *clnt); |
7b3fef8e | 80 | static void rpc_check_timeout(struct rpc_task *task); |
64c91a1f | 81 | |
188fef11 TM |
82 | static void rpc_register_client(struct rpc_clnt *clnt) |
83 | { | |
2446ab60 TM |
84 | struct net *net = rpc_net_ns(clnt); |
85 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
86 | |
87 | spin_lock(&sn->rpc_client_lock); | |
88 | list_add(&clnt->cl_clients, &sn->all_clients); | |
89 | spin_unlock(&sn->rpc_client_lock); | |
188fef11 TM |
90 | } |
91 | ||
92 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
93 | { | |
2446ab60 TM |
94 | struct net *net = rpc_net_ns(clnt); |
95 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
96 | |
97 | spin_lock(&sn->rpc_client_lock); | |
188fef11 | 98 | list_del(&clnt->cl_clients); |
70abc49b | 99 | spin_unlock(&sn->rpc_client_lock); |
188fef11 | 100 | } |
1da177e4 | 101 | |
0157d021 SK |
102 | static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) |
103 | { | |
c36dcfe1 | 104 | rpc_remove_client_dir(clnt); |
0157d021 SK |
105 | } |
106 | ||
107 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
108 | { | |
2446ab60 | 109 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 110 | struct super_block *pipefs_sb; |
0157d021 | 111 | |
2446ab60 | 112 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 113 | if (pipefs_sb) { |
0157d021 | 114 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 115 | rpc_put_sb_net(net); |
0157d021 | 116 | } |
0157d021 SK |
117 | } |
118 | ||
119 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
41b6b4d0 | 120 | struct rpc_clnt *clnt) |
1da177e4 | 121 | { |
f134585a | 122 | static uint32_t clntid; |
41b6b4d0 | 123 | const char *dir_name = clnt->cl_program->pipe_dir_name; |
23ac6581 | 124 | char name[15]; |
0157d021 | 125 | struct dentry *dir, *dentry; |
1da177e4 | 126 | |
0157d021 | 127 | dir = rpc_d_lookup_sb(sb, dir_name); |
922eeac3 WAA |
128 | if (dir == NULL) { |
129 | pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); | |
0157d021 | 130 | return dir; |
922eeac3 | 131 | } |
f134585a | 132 | for (;;) { |
a95e691f | 133 | snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
23ac6581 | 134 | name[sizeof(name) - 1] = '\0'; |
a95e691f | 135 | dentry = rpc_create_client_dir(dir, name, clnt); |
0157d021 | 136 | if (!IS_ERR(dentry)) |
23ac6581 | 137 | break; |
a95e691f AV |
138 | if (dentry == ERR_PTR(-EEXIST)) |
139 | continue; | |
140 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" | |
141 | " %s/%s, error %ld\n", | |
142 | dir_name, name, PTR_ERR(dentry)); | |
143 | break; | |
1da177e4 | 144 | } |
0157d021 SK |
145 | dput(dir); |
146 | return dentry; | |
147 | } | |
148 | ||
149 | static int | |
41b6b4d0 | 150 | rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt) |
0157d021 | 151 | { |
30507f58 | 152 | struct dentry *dentry; |
0157d021 | 153 | |
c36dcfe1 TM |
154 | if (clnt->cl_program->pipe_dir_name != NULL) { |
155 | dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt); | |
156 | if (IS_ERR(dentry)) | |
157 | return PTR_ERR(dentry); | |
158 | } | |
23ac6581 | 159 | return 0; |
1da177e4 LT |
160 | } |
161 | ||
41b6b4d0 | 162 | static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) |
ea8cfa06 | 163 | { |
41b6b4d0 | 164 | if (clnt->cl_program->pipe_dir_name == NULL) |
4f6bb246 | 165 | return 1; |
41b6b4d0 | 166 | |
c36dcfe1 TM |
167 | switch (event) { |
168 | case RPC_PIPEFS_MOUNT: | |
169 | if (clnt->cl_pipedir_objects.pdh_dentry != NULL) | |
170 | return 1; | |
71d3d0eb | 171 | if (refcount_read(&clnt->cl_count) == 0) |
c36dcfe1 TM |
172 | return 1; |
173 | break; | |
174 | case RPC_PIPEFS_UMOUNT: | |
175 | if (clnt->cl_pipedir_objects.pdh_dentry == NULL) | |
176 | return 1; | |
177 | break; | |
178 | } | |
ea8cfa06 SK |
179 | return 0; |
180 | } | |
181 | ||
182 | static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, | |
183 | struct super_block *sb) | |
80df9d20 SK |
184 | { |
185 | struct dentry *dentry; | |
80df9d20 SK |
186 | |
187 | switch (event) { | |
188 | case RPC_PIPEFS_MOUNT: | |
41b6b4d0 | 189 | dentry = rpc_setup_pipedir_sb(sb, clnt); |
922eeac3 WAA |
190 | if (!dentry) |
191 | return -ENOENT; | |
80df9d20 SK |
192 | if (IS_ERR(dentry)) |
193 | return PTR_ERR(dentry); | |
80df9d20 SK |
194 | break; |
195 | case RPC_PIPEFS_UMOUNT: | |
196 | __rpc_clnt_remove_pipedir(clnt); | |
197 | break; | |
198 | default: | |
199 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
200 | return -ENOTSUPP; | |
201 | } | |
2813b626 | 202 | return 0; |
80df9d20 SK |
203 | } |
204 | ||
ea8cfa06 SK |
205 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
206 | struct super_block *sb) | |
207 | { | |
208 | int error = 0; | |
209 | ||
210 | for (;; clnt = clnt->cl_parent) { | |
211 | if (!rpc_clnt_skip_event(clnt, event)) | |
212 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
213 | if (error || clnt == clnt->cl_parent) | |
214 | break; | |
215 | } | |
216 | return error; | |
217 | } | |
218 | ||
da3b4622 SK |
219 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
220 | { | |
221 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
222 | struct rpc_clnt *clnt; | |
223 | ||
224 | spin_lock(&sn->rpc_client_lock); | |
225 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
ea8cfa06 | 226 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 227 | continue; |
da3b4622 SK |
228 | spin_unlock(&sn->rpc_client_lock); |
229 | return clnt; | |
230 | } | |
231 | spin_unlock(&sn->rpc_client_lock); | |
232 | return NULL; | |
233 | } | |
234 | ||
80df9d20 SK |
235 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
236 | void *ptr) | |
237 | { | |
238 | struct super_block *sb = ptr; | |
239 | struct rpc_clnt *clnt; | |
240 | int error = 0; | |
80df9d20 | 241 | |
da3b4622 | 242 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 SK |
243 | error = __rpc_pipefs_event(clnt, event, sb); |
244 | if (error) | |
245 | break; | |
246 | } | |
80df9d20 SK |
247 | return error; |
248 | } | |
249 | ||
250 | static struct notifier_block rpc_clients_block = { | |
251 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 252 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
253 | }; |
254 | ||
255 | int rpc_clients_notifier_register(void) | |
256 | { | |
257 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
258 | } | |
259 | ||
260 | void rpc_clients_notifier_unregister(void) | |
261 | { | |
262 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
263 | } | |
264 | ||
40b00b6b TM |
265 | static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt, |
266 | struct rpc_xprt *xprt, | |
267 | const struct rpc_timeout *timeout) | |
268 | { | |
269 | struct rpc_xprt *old; | |
270 | ||
271 | spin_lock(&clnt->cl_lock); | |
34751b9d TM |
272 | old = rcu_dereference_protected(clnt->cl_xprt, |
273 | lockdep_is_held(&clnt->cl_lock)); | |
40b00b6b TM |
274 | |
275 | if (!xprt_bound(xprt)) | |
276 | clnt->cl_autobind = 1; | |
277 | ||
278 | clnt->cl_timeout = timeout; | |
279 | rcu_assign_pointer(clnt->cl_xprt, xprt); | |
280 | spin_unlock(&clnt->cl_lock); | |
281 | ||
282 | return old; | |
283 | } | |
284 | ||
cbbb3449 TM |
285 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
286 | { | |
03a9a42a TM |
287 | clnt->cl_nodelen = strlcpy(clnt->cl_nodename, |
288 | nodename, sizeof(clnt->cl_nodename)); | |
cbbb3449 TM |
289 | } |
290 | ||
d746e545 CL |
291 | static int rpc_client_register(struct rpc_clnt *clnt, |
292 | rpc_authflavor_t pseudoflavor, | |
293 | const char *client_name) | |
e73f4cc0 | 294 | { |
c2190661 | 295 | struct rpc_auth_create_args auth_args = { |
d746e545 CL |
296 | .pseudoflavor = pseudoflavor, |
297 | .target_name = client_name, | |
c2190661 | 298 | }; |
e73f4cc0 SK |
299 | struct rpc_auth *auth; |
300 | struct net *net = rpc_net_ns(clnt); | |
301 | struct super_block *pipefs_sb; | |
eeee2452 | 302 | int err; |
e73f4cc0 | 303 | |
f9c72d10 | 304 | rpc_clnt_debugfs_register(clnt); |
b4b9d2cc | 305 | |
e73f4cc0 SK |
306 | pipefs_sb = rpc_get_sb_net(net); |
307 | if (pipefs_sb) { | |
41b6b4d0 | 308 | err = rpc_setup_pipedir(pipefs_sb, clnt); |
e73f4cc0 SK |
309 | if (err) |
310 | goto out; | |
311 | } | |
312 | ||
eeee2452 TM |
313 | rpc_register_client(clnt); |
314 | if (pipefs_sb) | |
315 | rpc_put_sb_net(net); | |
316 | ||
c2190661 | 317 | auth = rpcauth_create(&auth_args, clnt); |
e73f4cc0 SK |
318 | if (IS_ERR(auth)) { |
319 | dprintk("RPC: Couldn't create auth handle (flavor %u)\n", | |
d746e545 | 320 | pseudoflavor); |
e73f4cc0 SK |
321 | err = PTR_ERR(auth); |
322 | goto err_auth; | |
323 | } | |
eeee2452 TM |
324 | return 0; |
325 | err_auth: | |
326 | pipefs_sb = rpc_get_sb_net(net); | |
1540c5d3 | 327 | rpc_unregister_client(clnt); |
eeee2452 | 328 | __rpc_clnt_remove_pipedir(clnt); |
e73f4cc0 SK |
329 | out: |
330 | if (pipefs_sb) | |
331 | rpc_put_sb_net(net); | |
c5a382eb | 332 | rpc_sysfs_client_destroy(clnt); |
b4b9d2cc | 333 | rpc_clnt_debugfs_unregister(clnt); |
e73f4cc0 | 334 | return err; |
e73f4cc0 SK |
335 | } |
336 | ||
2f048db4 TM |
337 | static DEFINE_IDA(rpc_clids); |
338 | ||
c929ea0b KM |
339 | void rpc_cleanup_clids(void) |
340 | { | |
341 | ida_destroy(&rpc_clids); | |
342 | } | |
343 | ||
2f048db4 TM |
344 | static int rpc_alloc_clid(struct rpc_clnt *clnt) |
345 | { | |
346 | int clid; | |
347 | ||
348 | clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL); | |
349 | if (clid < 0) | |
350 | return clid; | |
351 | clnt->cl_clid = clid; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static void rpc_free_clid(struct rpc_clnt *clnt) | |
356 | { | |
357 | ida_simple_remove(&rpc_clids, clnt->cl_clid); | |
358 | } | |
359 | ||
280ebcf9 | 360 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, |
ad01b2c6 | 361 | struct rpc_xprt_switch *xps, |
280ebcf9 TM |
362 | struct rpc_xprt *xprt, |
363 | struct rpc_clnt *parent) | |
1da177e4 | 364 | { |
a613fa16 TM |
365 | const struct rpc_program *program = args->program; |
366 | const struct rpc_version *version; | |
40b00b6b TM |
367 | struct rpc_clnt *clnt = NULL; |
368 | const struct rpc_timeout *timeout; | |
03a9a42a | 369 | const char *nodename = args->nodename; |
1da177e4 | 370 | int err; |
06b8d255 | 371 | |
4ada539e TM |
372 | err = rpciod_up(); |
373 | if (err) | |
374 | goto out_no_rpciod; | |
698b6d08 | 375 | |
f05c124a | 376 | err = -EINVAL; |
698b6d08 TM |
377 | if (args->version >= program->nrvers) |
378 | goto out_err; | |
379 | version = program->version[args->version]; | |
380 | if (version == NULL) | |
1da177e4 LT |
381 | goto out_err; |
382 | ||
383 | err = -ENOMEM; | |
0da974f4 | 384 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
385 | if (!clnt) |
386 | goto out_err; | |
280ebcf9 | 387 | clnt->cl_parent = parent ? : clnt; |
1da177e4 | 388 | |
2f048db4 TM |
389 | err = rpc_alloc_clid(clnt); |
390 | if (err) | |
391 | goto out_no_clid; | |
1da177e4 | 392 | |
79caa5fa | 393 | clnt->cl_cred = get_cred(args->cred); |
1da177e4 LT |
394 | clnt->cl_procinfo = version->procs; |
395 | clnt->cl_maxproc = version->nrprocs; | |
d5b337b4 | 396 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 397 | clnt->cl_vers = version->number; |
1da177e4 | 398 | clnt->cl_stats = program->stats; |
11c556b3 | 399 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
6739ffb7 | 400 | rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); |
23bf85ba TM |
401 | err = -ENOMEM; |
402 | if (clnt->cl_metrics == NULL) | |
403 | goto out_no_stats; | |
3e32a5d9 | 404 | clnt->cl_program = program; |
6529eba0 | 405 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 406 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 407 | |
40b00b6b | 408 | timeout = xprt->timeout; |
ba7392bb TM |
409 | if (args->timeout != NULL) { |
410 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
411 | sizeof(clnt->cl_timeout_default)); | |
40b00b6b | 412 | timeout = &clnt->cl_timeout_default; |
ba7392bb TM |
413 | } |
414 | ||
40b00b6b | 415 | rpc_clnt_set_transport(clnt, xprt, timeout); |
e091853e | 416 | xprt->main = true; |
ad01b2c6 TM |
417 | xprt_iter_init(&clnt->cl_xpi, xps); |
418 | xprt_switch_put(xps); | |
40b00b6b | 419 | |
1da177e4 | 420 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 421 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
1da177e4 | 422 | |
71d3d0eb | 423 | refcount_set(&clnt->cl_count, 1); |
34f52e35 | 424 | |
03a9a42a TM |
425 | if (nodename == NULL) |
426 | nodename = utsname()->nodename; | |
1da177e4 | 427 | /* save the nodename */ |
03a9a42a | 428 | rpc_clnt_set_nodename(clnt, nodename); |
e73f4cc0 | 429 | |
2a338a54 | 430 | rpc_sysfs_client_setup(clnt, xps, rpc_net_ns(clnt)); |
d746e545 | 431 | err = rpc_client_register(clnt, args->authflavor, args->client_name); |
e73f4cc0 SK |
432 | if (err) |
433 | goto out_no_path; | |
280ebcf9 | 434 | if (parent) |
71d3d0eb | 435 | refcount_inc(&parent->cl_count); |
42aad0d7 CL |
436 | |
437 | trace_rpc_clnt_new(clnt, xprt, program->name, args->servername); | |
1da177e4 LT |
438 | return clnt; |
439 | ||
1da177e4 | 440 | out_no_path: |
23bf85ba TM |
441 | rpc_free_iostats(clnt->cl_metrics); |
442 | out_no_stats: | |
79caa5fa | 443 | put_cred(clnt->cl_cred); |
2f048db4 TM |
444 | rpc_free_clid(clnt); |
445 | out_no_clid: | |
1da177e4 LT |
446 | kfree(clnt); |
447 | out_err: | |
4ada539e TM |
448 | rpciod_down(); |
449 | out_no_rpciod: | |
ad01b2c6 | 450 | xprt_switch_put(xps); |
f05c124a | 451 | xprt_put(xprt); |
42aad0d7 | 452 | trace_rpc_clnt_new_err(program->name, args->servername, err); |
1da177e4 LT |
453 | return ERR_PTR(err); |
454 | } | |
455 | ||
d50039ea | 456 | static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args, |
83ddfebd KM |
457 | struct rpc_xprt *xprt) |
458 | { | |
459 | struct rpc_clnt *clnt = NULL; | |
ad01b2c6 | 460 | struct rpc_xprt_switch *xps; |
83ddfebd | 461 | |
39a9beab | 462 | if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) { |
16590a22 | 463 | WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC)); |
39a9beab BF |
464 | xps = args->bc_xprt->xpt_bc_xps; |
465 | xprt_switch_get(xps); | |
466 | } else { | |
467 | xps = xprt_switch_alloc(xprt, GFP_KERNEL); | |
468 | if (xps == NULL) { | |
469 | xprt_put(xprt); | |
470 | return ERR_PTR(-ENOMEM); | |
471 | } | |
472 | if (xprt->bc_xprt) { | |
473 | xprt_switch_get(xps); | |
474 | xprt->bc_xprt->xpt_bc_xps = xps; | |
475 | } | |
1208fd56 | 476 | } |
ad01b2c6 | 477 | clnt = rpc_new_client(args, xps, xprt, NULL); |
83ddfebd KM |
478 | if (IS_ERR(clnt)) |
479 | return clnt; | |
480 | ||
481 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
482 | int err = rpc_ping(clnt); | |
483 | if (err != 0) { | |
484 | rpc_shutdown_client(clnt); | |
485 | return ERR_PTR(err); | |
486 | } | |
fd13359f TM |
487 | } else if (args->flags & RPC_CLNT_CREATE_CONNECTED) { |
488 | int err = rpc_ping_noreply(clnt); | |
489 | if (err != 0) { | |
490 | rpc_shutdown_client(clnt); | |
491 | return ERR_PTR(err); | |
492 | } | |
83ddfebd KM |
493 | } |
494 | ||
495 | clnt->cl_softrtry = 1; | |
ae6ec918 | 496 | if (args->flags & (RPC_CLNT_CREATE_HARDRTRY|RPC_CLNT_CREATE_SOFTERR)) { |
83ddfebd | 497 | clnt->cl_softrtry = 0; |
ae6ec918 TM |
498 | if (args->flags & RPC_CLNT_CREATE_SOFTERR) |
499 | clnt->cl_softerr = 1; | |
500 | } | |
83ddfebd KM |
501 | |
502 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
503 | clnt->cl_autobind = 1; | |
2aca5b86 TM |
504 | if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT) |
505 | clnt->cl_noretranstimeo = 1; | |
83ddfebd KM |
506 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
507 | clnt->cl_discrtry = 1; | |
508 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) | |
509 | clnt->cl_chatty = 1; | |
510 | ||
511 | return clnt; | |
512 | } | |
83ddfebd | 513 | |
2c53040f | 514 | /** |
c2866763 CL |
515 | * rpc_create - create an RPC client and transport with one call |
516 | * @args: rpc_clnt create argument structure | |
517 | * | |
518 | * Creates and initializes an RPC transport and an RPC client. | |
519 | * | |
520 | * It can ping the server in order to determine if it is up, and to see if | |
521 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
522 | * this behavior so asynchronous tasks can also use rpc_create. | |
523 | */ | |
524 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
525 | { | |
526 | struct rpc_xprt *xprt; | |
3c341b0b | 527 | struct xprt_create xprtargs = { |
9a23e332 | 528 | .net = args->net, |
4fa016eb | 529 | .ident = args->protocol, |
d3bc9a1d | 530 | .srcaddr = args->saddress, |
96802a09 FM |
531 | .dstaddr = args->address, |
532 | .addrlen = args->addrsize, | |
4e0038b6 | 533 | .servername = args->servername, |
f300baba | 534 | .bc_xprt = args->bc_xprt, |
96802a09 | 535 | }; |
510deb0d | 536 | char servername[48]; |
612b41f8 TM |
537 | struct rpc_clnt *clnt; |
538 | int i; | |
c2866763 | 539 | |
d50039ea | 540 | if (args->bc_xprt) { |
16590a22 | 541 | WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC)); |
d50039ea BF |
542 | xprt = args->bc_xprt->xpt_bc_xprt; |
543 | if (xprt) { | |
544 | xprt_get(xprt); | |
545 | return rpc_create_xprt(args, xprt); | |
546 | } | |
547 | } | |
548 | ||
b7993ceb TM |
549 | if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) |
550 | xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; | |
33d90ac0 BF |
551 | if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) |
552 | xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; | |
43780b87 CL |
553 | /* |
554 | * If the caller chooses not to specify a hostname, whip | |
555 | * up a string representation of the passed-in address. | |
556 | */ | |
4e0038b6 | 557 | if (xprtargs.servername == NULL) { |
176e21ee CL |
558 | struct sockaddr_un *sun = |
559 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
560 | struct sockaddr_in *sin = |
561 | (struct sockaddr_in *)args->address; | |
562 | struct sockaddr_in6 *sin6 = | |
563 | (struct sockaddr_in6 *)args->address; | |
564 | ||
510deb0d CL |
565 | servername[0] = '\0'; |
566 | switch (args->address->sa_family) { | |
176e21ee CL |
567 | case AF_LOCAL: |
568 | snprintf(servername, sizeof(servername), "%s", | |
569 | sun->sun_path); | |
570 | break; | |
da09eb93 | 571 | case AF_INET: |
21454aaa HH |
572 | snprintf(servername, sizeof(servername), "%pI4", |
573 | &sin->sin_addr.s_addr); | |
510deb0d | 574 | break; |
da09eb93 | 575 | case AF_INET6: |
5b095d98 | 576 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 577 | &sin6->sin6_addr); |
510deb0d | 578 | break; |
510deb0d CL |
579 | default: |
580 | /* caller wants default server name, but | |
581 | * address family isn't recognized. */ | |
582 | return ERR_PTR(-EINVAL); | |
583 | } | |
4e0038b6 | 584 | xprtargs.servername = servername; |
43780b87 CL |
585 | } |
586 | ||
510deb0d CL |
587 | xprt = xprt_create_transport(&xprtargs); |
588 | if (IS_ERR(xprt)) | |
589 | return (struct rpc_clnt *)xprt; | |
590 | ||
c2866763 CL |
591 | /* |
592 | * By default, kernel RPC client connects from a reserved port. | |
593 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
594 | * but it is always enabled for rpciod, which handles the connect | |
595 | * operation. | |
596 | */ | |
597 | xprt->resvport = 1; | |
598 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
599 | xprt->resvport = 0; | |
e6237b6f TM |
600 | xprt->reuseport = 0; |
601 | if (args->flags & RPC_CLNT_CREATE_REUSEPORT) | |
602 | xprt->reuseport = 1; | |
c2866763 | 603 | |
612b41f8 TM |
604 | clnt = rpc_create_xprt(args, xprt); |
605 | if (IS_ERR(clnt) || args->nconnect <= 1) | |
606 | return clnt; | |
607 | ||
608 | for (i = 0; i < args->nconnect - 1; i++) { | |
609 | if (rpc_clnt_add_xprt(clnt, &xprtargs, NULL, NULL) < 0) | |
610 | break; | |
611 | } | |
612 | return clnt; | |
c2866763 | 613 | } |
b86acd50 | 614 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 615 | |
1da177e4 LT |
616 | /* |
617 | * This function clones the RPC client structure. It allows us to share the | |
618 | * same transport while varying parameters such as the authentication | |
619 | * flavour. | |
620 | */ | |
1b63a751 CL |
621 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
622 | struct rpc_clnt *clnt) | |
1da177e4 | 623 | { |
ad01b2c6 | 624 | struct rpc_xprt_switch *xps; |
2446ab60 | 625 | struct rpc_xprt *xprt; |
1b63a751 CL |
626 | struct rpc_clnt *new; |
627 | int err; | |
1da177e4 | 628 | |
1b63a751 | 629 | err = -ENOMEM; |
2446ab60 TM |
630 | rcu_read_lock(); |
631 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
ad01b2c6 | 632 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); |
2446ab60 | 633 | rcu_read_unlock(); |
ad01b2c6 TM |
634 | if (xprt == NULL || xps == NULL) { |
635 | xprt_put(xprt); | |
636 | xprt_switch_put(xps); | |
1b63a751 | 637 | goto out_err; |
ad01b2c6 | 638 | } |
1b63a751 | 639 | args->servername = xprt->servername; |
03a9a42a | 640 | args->nodename = clnt->cl_nodename; |
1b63a751 | 641 | |
ad01b2c6 | 642 | new = rpc_new_client(args, xps, xprt, clnt); |
42aad0d7 CL |
643 | if (IS_ERR(new)) |
644 | return new; | |
1b63a751 | 645 | |
1b63a751 CL |
646 | /* Turn off autobind on clones */ |
647 | new->cl_autobind = 0; | |
648 | new->cl_softrtry = clnt->cl_softrtry; | |
ae6ec918 | 649 | new->cl_softerr = clnt->cl_softerr; |
2aca5b86 | 650 | new->cl_noretranstimeo = clnt->cl_noretranstimeo; |
1b63a751 CL |
651 | new->cl_discrtry = clnt->cl_discrtry; |
652 | new->cl_chatty = clnt->cl_chatty; | |
5e16923b | 653 | new->cl_principal = clnt->cl_principal; |
30479125 | 654 | new->cl_max_connect = clnt->cl_max_connect; |
1da177e4 | 655 | return new; |
1b63a751 | 656 | |
1b63a751 | 657 | out_err: |
42aad0d7 | 658 | trace_rpc_clnt_clone_err(clnt, err); |
3e32a5d9 | 659 | return ERR_PTR(err); |
1da177e4 | 660 | } |
1b63a751 CL |
661 | |
662 | /** | |
663 | * rpc_clone_client - Clone an RPC client structure | |
664 | * | |
665 | * @clnt: RPC client whose parameters are copied | |
666 | * | |
667 | * Returns a fresh RPC client or an ERR_PTR. | |
668 | */ | |
669 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
670 | { | |
671 | struct rpc_create_args args = { | |
672 | .program = clnt->cl_program, | |
673 | .prognumber = clnt->cl_prog, | |
674 | .version = clnt->cl_vers, | |
675 | .authflavor = clnt->cl_auth->au_flavor, | |
79caa5fa | 676 | .cred = clnt->cl_cred, |
1b63a751 CL |
677 | }; |
678 | return __rpc_clone_client(&args, clnt); | |
679 | } | |
e8914c65 | 680 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 681 | |
ba9b584c CL |
682 | /** |
683 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
684 | * | |
685 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 686 | * @flavor: security flavor for new client |
ba9b584c CL |
687 | * |
688 | * Returns a fresh RPC client or an ERR_PTR. | |
689 | */ | |
690 | struct rpc_clnt * | |
691 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
692 | { | |
693 | struct rpc_create_args args = { | |
694 | .program = clnt->cl_program, | |
695 | .prognumber = clnt->cl_prog, | |
696 | .version = clnt->cl_vers, | |
697 | .authflavor = flavor, | |
79caa5fa | 698 | .cred = clnt->cl_cred, |
ba9b584c CL |
699 | }; |
700 | return __rpc_clone_client(&args, clnt); | |
701 | } | |
702 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
703 | ||
40b00b6b TM |
704 | /** |
705 | * rpc_switch_client_transport: switch the RPC transport on the fly | |
706 | * @clnt: pointer to a struct rpc_clnt | |
707 | * @args: pointer to the new transport arguments | |
708 | * @timeout: pointer to the new timeout parameters | |
709 | * | |
710 | * This function allows the caller to switch the RPC transport for the | |
711 | * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS | |
712 | * server, for instance. It assumes that the caller has ensured that | |
713 | * there are no active RPC tasks by using some form of locking. | |
714 | * | |
715 | * Returns zero if "clnt" is now using the new xprt. Otherwise a | |
716 | * negative errno is returned, and "clnt" continues to use the old | |
717 | * xprt. | |
718 | */ | |
719 | int rpc_switch_client_transport(struct rpc_clnt *clnt, | |
720 | struct xprt_create *args, | |
721 | const struct rpc_timeout *timeout) | |
722 | { | |
723 | const struct rpc_timeout *old_timeo; | |
724 | rpc_authflavor_t pseudoflavor; | |
ad01b2c6 | 725 | struct rpc_xprt_switch *xps, *oldxps; |
40b00b6b TM |
726 | struct rpc_xprt *xprt, *old; |
727 | struct rpc_clnt *parent; | |
728 | int err; | |
729 | ||
730 | xprt = xprt_create_transport(args); | |
42aad0d7 | 731 | if (IS_ERR(xprt)) |
40b00b6b | 732 | return PTR_ERR(xprt); |
40b00b6b | 733 | |
ad01b2c6 TM |
734 | xps = xprt_switch_alloc(xprt, GFP_KERNEL); |
735 | if (xps == NULL) { | |
736 | xprt_put(xprt); | |
737 | return -ENOMEM; | |
738 | } | |
739 | ||
40b00b6b TM |
740 | pseudoflavor = clnt->cl_auth->au_flavor; |
741 | ||
742 | old_timeo = clnt->cl_timeout; | |
743 | old = rpc_clnt_set_transport(clnt, xprt, timeout); | |
ad01b2c6 | 744 | oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps); |
40b00b6b TM |
745 | |
746 | rpc_unregister_client(clnt); | |
747 | __rpc_clnt_remove_pipedir(clnt); | |
c5a382eb | 748 | rpc_sysfs_client_destroy(clnt); |
b4b9d2cc | 749 | rpc_clnt_debugfs_unregister(clnt); |
40b00b6b TM |
750 | |
751 | /* | |
752 | * A new transport was created. "clnt" therefore | |
753 | * becomes the root of a new cl_parent tree. clnt's | |
754 | * children, if it has any, still point to the old xprt. | |
755 | */ | |
756 | parent = clnt->cl_parent; | |
757 | clnt->cl_parent = clnt; | |
758 | ||
759 | /* | |
760 | * The old rpc_auth cache cannot be re-used. GSS | |
761 | * contexts in particular are between a single | |
762 | * client and server. | |
763 | */ | |
764 | err = rpc_client_register(clnt, pseudoflavor, NULL); | |
765 | if (err) | |
766 | goto out_revert; | |
767 | ||
768 | synchronize_rcu(); | |
769 | if (parent != clnt) | |
770 | rpc_release_client(parent); | |
ad01b2c6 | 771 | xprt_switch_put(oldxps); |
40b00b6b | 772 | xprt_put(old); |
42aad0d7 | 773 | trace_rpc_clnt_replace_xprt(clnt); |
40b00b6b TM |
774 | return 0; |
775 | ||
776 | out_revert: | |
ad01b2c6 | 777 | xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps); |
40b00b6b TM |
778 | rpc_clnt_set_transport(clnt, old, old_timeo); |
779 | clnt->cl_parent = parent; | |
780 | rpc_client_register(clnt, pseudoflavor, NULL); | |
ad01b2c6 | 781 | xprt_switch_put(xps); |
40b00b6b | 782 | xprt_put(xprt); |
42aad0d7 | 783 | trace_rpc_clnt_replace_xprt_err(clnt); |
40b00b6b TM |
784 | return err; |
785 | } | |
786 | EXPORT_SYMBOL_GPL(rpc_switch_client_transport); | |
787 | ||
3227886c | 788 | static |
95d0d30c OK |
789 | int _rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi, |
790 | void func(struct rpc_xprt_iter *xpi, struct rpc_xprt_switch *xps)) | |
3227886c TM |
791 | { |
792 | struct rpc_xprt_switch *xps; | |
793 | ||
794 | rcu_read_lock(); | |
795 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); | |
796 | rcu_read_unlock(); | |
797 | if (xps == NULL) | |
798 | return -EAGAIN; | |
95d0d30c | 799 | func(xpi, xps); |
3227886c TM |
800 | xprt_switch_put(xps); |
801 | return 0; | |
802 | } | |
803 | ||
95d0d30c OK |
804 | static |
805 | int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi) | |
806 | { | |
807 | return _rpc_clnt_xprt_iter_init(clnt, xpi, xprt_iter_init_listall); | |
808 | } | |
809 | ||
92cc04f6 OK |
810 | static |
811 | int rpc_clnt_xprt_iter_offline_init(struct rpc_clnt *clnt, | |
812 | struct rpc_xprt_iter *xpi) | |
813 | { | |
814 | return _rpc_clnt_xprt_iter_init(clnt, xpi, xprt_iter_init_listoffline); | |
815 | } | |
816 | ||
3227886c TM |
817 | /** |
818 | * rpc_clnt_iterate_for_each_xprt - Apply a function to all transports | |
819 | * @clnt: pointer to client | |
820 | * @fn: function to apply | |
821 | * @data: void pointer to function data | |
822 | * | |
823 | * Iterates through the list of RPC transports currently attached to the | |
824 | * client and applies the function fn(clnt, xprt, data). | |
825 | * | |
826 | * On error, the iteration stops, and the function returns the error value. | |
827 | */ | |
828 | int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt, | |
829 | int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *), | |
830 | void *data) | |
831 | { | |
832 | struct rpc_xprt_iter xpi; | |
833 | int ret; | |
834 | ||
835 | ret = rpc_clnt_xprt_iter_init(clnt, &xpi); | |
836 | if (ret) | |
837 | return ret; | |
838 | for (;;) { | |
839 | struct rpc_xprt *xprt = xprt_iter_get_next(&xpi); | |
840 | ||
841 | if (!xprt) | |
842 | break; | |
843 | ret = fn(clnt, xprt, data); | |
844 | xprt_put(xprt); | |
845 | if (ret < 0) | |
846 | break; | |
847 | } | |
848 | xprt_iter_destroy(&xpi); | |
849 | return ret; | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt); | |
852 | ||
58f9612c TM |
853 | /* |
854 | * Kill all tasks for the given client. | |
855 | * XXX: kill their descendants as well? | |
856 | */ | |
857 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
858 | { | |
859 | struct rpc_task *rovr; | |
860 | ||
861 | ||
862 | if (list_empty(&clnt->cl_tasks)) | |
863 | return; | |
42aad0d7 | 864 | |
58f9612c TM |
865 | /* |
866 | * Spin lock all_tasks to prevent changes... | |
867 | */ | |
42aad0d7 | 868 | trace_rpc_clnt_killall(clnt); |
58f9612c | 869 | spin_lock(&clnt->cl_lock); |
ae67bd38 TM |
870 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) |
871 | rpc_signal_task(rovr); | |
58f9612c TM |
872 | spin_unlock(&clnt->cl_lock); |
873 | } | |
874 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
875 | ||
1da177e4 LT |
876 | /* |
877 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 878 | * requests. |
1da177e4 | 879 | */ |
4c402b40 | 880 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 881 | { |
168e4b39 WAA |
882 | might_sleep(); |
883 | ||
42aad0d7 | 884 | trace_rpc_clnt_shutdown(clnt); |
1da177e4 | 885 | |
34f52e35 | 886 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 887 | rpc_killall_tasks(clnt); |
532347e2 | 888 | wait_event_timeout(destroy_wait, |
34f52e35 | 889 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
890 | } |
891 | ||
4c402b40 | 892 | rpc_release_client(clnt); |
1da177e4 | 893 | } |
e8914c65 | 894 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
895 | |
896 | /* | |
34f52e35 | 897 | * Free an RPC client |
1da177e4 | 898 | */ |
7c4310ff N |
899 | static void rpc_free_client_work(struct work_struct *work) |
900 | { | |
901 | struct rpc_clnt *clnt = container_of(work, struct rpc_clnt, cl_work); | |
902 | ||
42aad0d7 CL |
903 | trace_rpc_clnt_free(clnt); |
904 | ||
7c4310ff N |
905 | /* These might block on processes that might allocate memory, |
906 | * so they cannot be called in rpciod, so they are handled separately | |
907 | * here. | |
908 | */ | |
c5a382eb | 909 | rpc_sysfs_client_destroy(clnt); |
7c4310ff | 910 | rpc_clnt_debugfs_unregister(clnt); |
933496e9 | 911 | rpc_free_clid(clnt); |
7c4310ff | 912 | rpc_clnt_remove_pipedir(clnt); |
31e9a7f3 | 913 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
7c4310ff N |
914 | |
915 | kfree(clnt); | |
916 | rpciod_down(); | |
917 | } | |
d07ba842 | 918 | static struct rpc_clnt * |
006abe88 | 919 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 920 | { |
d07ba842 TM |
921 | struct rpc_clnt *parent = NULL; |
922 | ||
42aad0d7 | 923 | trace_rpc_clnt_release(clnt); |
6eac7d3f | 924 | if (clnt->cl_parent != clnt) |
d07ba842 | 925 | parent = clnt->cl_parent; |
adb6fa7f | 926 | rpc_unregister_client(clnt); |
11c556b3 CL |
927 | rpc_free_iostats(clnt->cl_metrics); |
928 | clnt->cl_metrics = NULL; | |
ad01b2c6 | 929 | xprt_iter_destroy(&clnt->cl_xpi); |
79caa5fa | 930 | put_cred(clnt->cl_cred); |
7c4310ff N |
931 | |
932 | INIT_WORK(&clnt->cl_work, rpc_free_client_work); | |
933 | schedule_work(&clnt->cl_work); | |
d07ba842 | 934 | return parent; |
1da177e4 LT |
935 | } |
936 | ||
1dd17ec6 TM |
937 | /* |
938 | * Free an RPC client | |
939 | */ | |
8fdee4cc | 940 | static struct rpc_clnt * |
006abe88 | 941 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 942 | { |
1dd17ec6 TM |
943 | /* |
944 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
945 | * release remaining GSS contexts. This mechanism ensures | |
946 | * that it can do so safely. | |
947 | */ | |
71d3d0eb TM |
948 | if (clnt->cl_auth != NULL) { |
949 | rpcauth_release(clnt->cl_auth); | |
950 | clnt->cl_auth = NULL; | |
951 | } | |
952 | if (refcount_dec_and_test(&clnt->cl_count)) | |
d07ba842 TM |
953 | return rpc_free_client(clnt); |
954 | return NULL; | |
1dd17ec6 TM |
955 | } |
956 | ||
1da177e4 | 957 | /* |
34f52e35 | 958 | * Release reference to the RPC client |
1da177e4 LT |
959 | */ |
960 | void | |
961 | rpc_release_client(struct rpc_clnt *clnt) | |
962 | { | |
d07ba842 TM |
963 | do { |
964 | if (list_empty(&clnt->cl_tasks)) | |
965 | wake_up(&destroy_wait); | |
71d3d0eb | 966 | if (refcount_dec_not_one(&clnt->cl_count)) |
d07ba842 TM |
967 | break; |
968 | clnt = rpc_free_auth(clnt); | |
969 | } while (clnt != NULL); | |
34f52e35 | 970 | } |
1d658336 | 971 | EXPORT_SYMBOL_GPL(rpc_release_client); |
34f52e35 | 972 | |
007e251f AG |
973 | /** |
974 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
975 | * @old: old rpc_client |
976 | * @program: rpc program to set | |
977 | * @vers: rpc program version | |
007e251f AG |
978 | * |
979 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
980 | * of use for enabling different RPC programs to share the same transport. | |
981 | * The Sun NFSv2/v3 ACL protocol can do this. | |
982 | */ | |
983 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 984 | const struct rpc_program *program, |
89eb21c3 | 985 | u32 vers) |
007e251f | 986 | { |
f994c43d TM |
987 | struct rpc_create_args args = { |
988 | .program = program, | |
989 | .prognumber = program->number, | |
990 | .version = vers, | |
991 | .authflavor = old->cl_auth->au_flavor, | |
79caa5fa | 992 | .cred = old->cl_cred, |
f994c43d | 993 | }; |
007e251f | 994 | struct rpc_clnt *clnt; |
007e251f AG |
995 | int err; |
996 | ||
f994c43d | 997 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
998 | if (IS_ERR(clnt)) |
999 | goto out; | |
caabea8a | 1000 | err = rpc_ping(clnt); |
007e251f AG |
1001 | if (err != 0) { |
1002 | rpc_shutdown_client(clnt); | |
1003 | clnt = ERR_PTR(err); | |
1004 | } | |
cca5172a | 1005 | out: |
007e251f AG |
1006 | return clnt; |
1007 | } | |
e8914c65 | 1008 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 1009 | |
a101b043 TM |
1010 | struct rpc_xprt * |
1011 | rpc_task_get_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) | |
21f0ffaf TM |
1012 | { |
1013 | struct rpc_xprt_switch *xps; | |
21f0ffaf TM |
1014 | |
1015 | if (!xprt) | |
1016 | return NULL; | |
1017 | rcu_read_lock(); | |
1018 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); | |
1019 | atomic_long_inc(&xps->xps_queuelen); | |
1020 | rcu_read_unlock(); | |
1021 | atomic_long_inc(&xprt->queuelen); | |
1022 | ||
1023 | return xprt; | |
1024 | } | |
1025 | ||
1026 | static void | |
1027 | rpc_task_release_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) | |
1028 | { | |
1029 | struct rpc_xprt_switch *xps; | |
1030 | ||
1031 | atomic_long_dec(&xprt->queuelen); | |
1032 | rcu_read_lock(); | |
1033 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); | |
1034 | atomic_long_dec(&xps->xps_queuelen); | |
1035 | rcu_read_unlock(); | |
1036 | ||
1037 | xprt_put(xprt); | |
1038 | } | |
1039 | ||
0f90be13 BB |
1040 | void rpc_task_release_transport(struct rpc_task *task) |
1041 | { | |
1042 | struct rpc_xprt *xprt = task->tk_xprt; | |
1043 | ||
1044 | if (xprt) { | |
1045 | task->tk_xprt = NULL; | |
21f0ffaf TM |
1046 | if (task->tk_client) |
1047 | rpc_task_release_xprt(task->tk_client, xprt); | |
1048 | else | |
1049 | xprt_put(xprt); | |
0f90be13 BB |
1050 | } |
1051 | } | |
1052 | EXPORT_SYMBOL_GPL(rpc_task_release_transport); | |
1053 | ||
58f9612c TM |
1054 | void rpc_task_release_client(struct rpc_task *task) |
1055 | { | |
1056 | struct rpc_clnt *clnt = task->tk_client; | |
1057 | ||
21f0ffaf | 1058 | rpc_task_release_transport(task); |
58f9612c TM |
1059 | if (clnt != NULL) { |
1060 | /* Remove from client task list */ | |
1061 | spin_lock(&clnt->cl_lock); | |
1062 | list_del(&task->tk_task); | |
1063 | spin_unlock(&clnt->cl_lock); | |
1064 | task->tk_client = NULL; | |
1065 | ||
1066 | rpc_release_client(clnt); | |
1067 | } | |
0f90be13 | 1068 | } |
fb43d172 | 1069 | |
a101b043 TM |
1070 | static struct rpc_xprt * |
1071 | rpc_task_get_first_xprt(struct rpc_clnt *clnt) | |
1072 | { | |
1073 | struct rpc_xprt *xprt; | |
1074 | ||
1075 | rcu_read_lock(); | |
1076 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
1077 | rcu_read_unlock(); | |
1078 | return rpc_task_get_xprt(clnt, xprt); | |
1079 | } | |
1080 | ||
1081 | static struct rpc_xprt * | |
1082 | rpc_task_get_next_xprt(struct rpc_clnt *clnt) | |
1083 | { | |
1084 | return rpc_task_get_xprt(clnt, xprt_iter_get_next(&clnt->cl_xpi)); | |
1085 | } | |
1086 | ||
0f90be13 BB |
1087 | static |
1088 | void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt) | |
1089 | { | |
e13433b4 OK |
1090 | if (task->tk_xprt) { |
1091 | if (!(test_bit(XPRT_OFFLINE, &task->tk_xprt->state) && | |
1092 | (task->tk_flags & RPC_TASK_MOVEABLE))) | |
1093 | return; | |
1094 | xprt_release(task); | |
1095 | xprt_put(task->tk_xprt); | |
1096 | } | |
5a0c257f N |
1097 | if (task->tk_flags & RPC_TASK_NO_ROUND_ROBIN) |
1098 | task->tk_xprt = rpc_task_get_first_xprt(clnt); | |
1099 | else | |
a101b043 | 1100 | task->tk_xprt = rpc_task_get_next_xprt(clnt); |
58f9612c TM |
1101 | } |
1102 | ||
1103 | static | |
1104 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
1105 | { | |
023859ce TRB |
1106 | rpc_task_set_transport(task, clnt); |
1107 | task->tk_client = clnt; | |
1108 | refcount_inc(&clnt->cl_count); | |
1109 | if (clnt->cl_softrtry) | |
1110 | task->tk_flags |= RPC_TASK_SOFT; | |
1111 | if (clnt->cl_softerr) | |
1112 | task->tk_flags |= RPC_TASK_TIMEOUT; | |
1113 | if (clnt->cl_noretranstimeo) | |
1114 | task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT; | |
023859ce TRB |
1115 | /* Add to the client's list of all tasks */ |
1116 | spin_lock(&clnt->cl_lock); | |
1117 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
1118 | spin_unlock(&clnt->cl_lock); | |
58f9612c TM |
1119 | } |
1120 | ||
1121 | static void | |
1122 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
1123 | { | |
1124 | if (msg != NULL) { | |
1125 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
1126 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
1127 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
7eac5264 TM |
1128 | task->tk_msg.rpc_cred = msg->rpc_cred; |
1129 | if (!(task->tk_flags & RPC_TASK_CRED_NOREF)) | |
1130 | get_cred(task->tk_msg.rpc_cred); | |
58f9612c TM |
1131 | } |
1132 | } | |
1133 | ||
1da177e4 LT |
1134 | /* |
1135 | * Default callback for async RPC calls | |
1136 | */ | |
1137 | static void | |
963d8fe5 | 1138 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
1139 | { |
1140 | } | |
1141 | ||
963d8fe5 TM |
1142 | static const struct rpc_call_ops rpc_default_ops = { |
1143 | .rpc_call_done = rpc_default_callback, | |
1144 | }; | |
1145 | ||
c970aa85 TM |
1146 | /** |
1147 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
1148 | * @task_setup_data: pointer to task initialisation data | |
1149 | */ | |
1150 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 1151 | { |
19445b99 | 1152 | struct rpc_task *task; |
6e5b70e9 | 1153 | |
84115e1c | 1154 | task = rpc_new_task(task_setup_data); |
25cf32ad TM |
1155 | if (IS_ERR(task)) |
1156 | return task; | |
6e5b70e9 | 1157 | |
263fb9c2 TM |
1158 | if (!RPC_IS_ASYNC(task)) |
1159 | task->tk_flags |= RPC_TASK_CRED_NOREF; | |
1160 | ||
58f9612c TM |
1161 | rpc_task_set_client(task, task_setup_data->rpc_client); |
1162 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
1163 | ||
58f9612c TM |
1164 | if (task->tk_action == NULL) |
1165 | rpc_call_start(task); | |
1166 | ||
6e5b70e9 TM |
1167 | atomic_inc(&task->tk_count); |
1168 | rpc_execute(task); | |
19445b99 | 1169 | return task; |
6e5b70e9 | 1170 | } |
c970aa85 | 1171 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
1172 | |
1173 | /** | |
1174 | * rpc_call_sync - Perform a synchronous RPC call | |
1175 | * @clnt: pointer to RPC client | |
1176 | * @msg: RPC call parameters | |
1177 | * @flags: RPC call flags | |
1da177e4 | 1178 | */ |
cbc20059 | 1179 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
1180 | { |
1181 | struct rpc_task *task; | |
84115e1c TM |
1182 | struct rpc_task_setup task_setup_data = { |
1183 | .rpc_client = clnt, | |
1184 | .rpc_message = msg, | |
1185 | .callback_ops = &rpc_default_ops, | |
1186 | .flags = flags, | |
1187 | }; | |
6e5b70e9 | 1188 | int status; |
1da177e4 | 1189 | |
50d2bdb1 WAA |
1190 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
1191 | if (flags & RPC_TASK_ASYNC) { | |
1192 | rpc_release_calldata(task_setup_data.callback_ops, | |
1193 | task_setup_data.callback_data); | |
1194 | return -EINVAL; | |
1195 | } | |
1da177e4 | 1196 | |
c970aa85 | 1197 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1198 | if (IS_ERR(task)) |
1199 | return PTR_ERR(task); | |
e60859ac | 1200 | status = task->tk_status; |
bde8f00c | 1201 | rpc_put_task(task); |
1da177e4 LT |
1202 | return status; |
1203 | } | |
e8914c65 | 1204 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 1205 | |
6e5b70e9 TM |
1206 | /** |
1207 | * rpc_call_async - Perform an asynchronous RPC call | |
1208 | * @clnt: pointer to RPC client | |
1209 | * @msg: RPC call parameters | |
1210 | * @flags: RPC call flags | |
65b6e42c | 1211 | * @tk_ops: RPC call ops |
6e5b70e9 | 1212 | * @data: user call data |
1da177e4 LT |
1213 | */ |
1214 | int | |
cbc20059 | 1215 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 1216 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
1217 | { |
1218 | struct rpc_task *task; | |
84115e1c TM |
1219 | struct rpc_task_setup task_setup_data = { |
1220 | .rpc_client = clnt, | |
1221 | .rpc_message = msg, | |
1222 | .callback_ops = tk_ops, | |
1223 | .callback_data = data, | |
1224 | .flags = flags|RPC_TASK_ASYNC, | |
1225 | }; | |
1da177e4 | 1226 | |
c970aa85 | 1227 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1228 | if (IS_ERR(task)) |
1229 | return PTR_ERR(task); | |
1230 | rpc_put_task(task); | |
1231 | return 0; | |
1da177e4 | 1232 | } |
e8914c65 | 1233 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 1234 | |
9e00abc3 | 1235 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
477687e1 TM |
1236 | static void call_bc_encode(struct rpc_task *task); |
1237 | ||
55ae1aab RL |
1238 | /** |
1239 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
1240 | * rpc_execute against it | |
7a73fdde | 1241 | * @req: RPC request |
55ae1aab | 1242 | */ |
0f419791 | 1243 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req) |
55ae1aab RL |
1244 | { |
1245 | struct rpc_task *task; | |
55ae1aab | 1246 | struct rpc_task_setup task_setup_data = { |
0f419791 | 1247 | .callback_ops = &rpc_default_ops, |
762e4e67 TM |
1248 | .flags = RPC_TASK_SOFTCONN | |
1249 | RPC_TASK_NO_RETRANS_TIMEOUT, | |
55ae1aab RL |
1250 | }; |
1251 | ||
1252 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
1253 | /* | |
1254 | * Create an rpc_task to send the data | |
1255 | */ | |
1256 | task = rpc_new_task(&task_setup_data); | |
25cf32ad TM |
1257 | if (IS_ERR(task)) { |
1258 | xprt_free_bc_request(req); | |
1259 | return task; | |
1260 | } | |
1261 | ||
902c5887 | 1262 | xprt_init_bc_request(req, task); |
55ae1aab | 1263 | |
477687e1 | 1264 | task->tk_action = call_bc_encode; |
55ae1aab | 1265 | atomic_inc(&task->tk_count); |
9a6478f6 | 1266 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
1267 | rpc_execute(task); |
1268 | ||
55ae1aab RL |
1269 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); |
1270 | return task; | |
1271 | } | |
9e00abc3 | 1272 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1273 | |
cf500bac CL |
1274 | /** |
1275 | * rpc_prepare_reply_pages - Prepare to receive a reply data payload into pages | |
1276 | * @req: RPC request to prepare | |
1277 | * @pages: vector of struct page pointers | |
1278 | * @base: offset in first page where receive should start, in bytes | |
1279 | * @len: expected size of the upper layer data payload, in bytes | |
1280 | * @hdrsize: expected size of upper layer reply header, in XDR words | |
1281 | * | |
1282 | */ | |
1283 | void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages, | |
1284 | unsigned int base, unsigned int len, | |
1285 | unsigned int hdrsize) | |
1286 | { | |
9ed5af26 | 1287 | hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign; |
02ef04e4 | 1288 | |
cf500bac | 1289 | xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len); |
c509f15a | 1290 | trace_rpc_xdr_reply_pages(req->rq_task, &req->rq_rcv_buf); |
cf500bac CL |
1291 | } |
1292 | EXPORT_SYMBOL_GPL(rpc_prepare_reply_pages); | |
1293 | ||
77de2c59 TM |
1294 | void |
1295 | rpc_call_start(struct rpc_task *task) | |
1296 | { | |
1297 | task->tk_action = call_start; | |
1298 | } | |
1299 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
1300 | ||
ed39440a CL |
1301 | /** |
1302 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
1303 | * @clnt: RPC client structure | |
1304 | * @buf: target buffer | |
65b6e42c | 1305 | * @bufsize: length of target buffer |
ed39440a CL |
1306 | * |
1307 | * Returns the number of bytes that are actually in the stored address. | |
1308 | */ | |
1309 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
1310 | { | |
1311 | size_t bytes; | |
2446ab60 TM |
1312 | struct rpc_xprt *xprt; |
1313 | ||
1314 | rcu_read_lock(); | |
1315 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 1316 | |
2446ab60 | 1317 | bytes = xprt->addrlen; |
ed39440a CL |
1318 | if (bytes > bufsize) |
1319 | bytes = bufsize; | |
2446ab60 TM |
1320 | memcpy(buf, &xprt->addr, bytes); |
1321 | rcu_read_unlock(); | |
1322 | ||
1323 | return bytes; | |
ed39440a | 1324 | } |
b86acd50 | 1325 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 1326 | |
f425eba4 CL |
1327 | /** |
1328 | * rpc_peeraddr2str - return remote peer address in printable format | |
1329 | * @clnt: RPC client structure | |
1330 | * @format: address format | |
1331 | * | |
2446ab60 TM |
1332 | * NB: the lifetime of the memory referenced by the returned pointer is |
1333 | * the same as the rpc_xprt itself. As long as the caller uses this | |
1334 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 1335 | */ |
b454ae90 CL |
1336 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
1337 | enum rpc_display_format_t format) | |
f425eba4 | 1338 | { |
2446ab60 TM |
1339 | struct rpc_xprt *xprt; |
1340 | ||
1341 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
1342 | |
1343 | if (xprt->address_strings[format] != NULL) | |
1344 | return xprt->address_strings[format]; | |
1345 | else | |
1346 | return "unprintable"; | |
f425eba4 | 1347 | } |
b86acd50 | 1348 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 1349 | |
2e738fdc CL |
1350 | static const struct sockaddr_in rpc_inaddr_loopback = { |
1351 | .sin_family = AF_INET, | |
1352 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1353 | }; | |
1354 | ||
1355 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
1356 | .sin6_family = AF_INET6, | |
1357 | .sin6_addr = IN6ADDR_ANY_INIT, | |
1358 | }; | |
1359 | ||
1360 | /* | |
1361 | * Try a getsockname() on a connected datagram socket. Using a | |
1362 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
1363 | * This conserves the ephemeral port number space. | |
1364 | * | |
1365 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1366 | * negative errno is returned. | |
1367 | */ | |
1368 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
9b2c45d4 | 1369 | struct sockaddr *buf) |
2e738fdc CL |
1370 | { |
1371 | struct socket *sock; | |
1372 | int err; | |
1373 | ||
1374 | err = __sock_create(net, sap->sa_family, | |
1375 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1376 | if (err < 0) { | |
1377 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1378 | goto out; | |
1379 | } | |
1380 | ||
1381 | switch (sap->sa_family) { | |
1382 | case AF_INET: | |
1383 | err = kernel_bind(sock, | |
1384 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1385 | sizeof(rpc_inaddr_loopback)); | |
1386 | break; | |
1387 | case AF_INET6: | |
1388 | err = kernel_bind(sock, | |
1389 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1390 | sizeof(rpc_in6addr_loopback)); | |
1391 | break; | |
1392 | default: | |
1393 | err = -EAFNOSUPPORT; | |
1394 | goto out; | |
1395 | } | |
1396 | if (err < 0) { | |
1397 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1398 | goto out_release; | |
1399 | } | |
1400 | ||
1401 | err = kernel_connect(sock, sap, salen, 0); | |
1402 | if (err < 0) { | |
1403 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1404 | goto out_release; | |
1405 | } | |
1406 | ||
9b2c45d4 | 1407 | err = kernel_getsockname(sock, buf); |
2e738fdc CL |
1408 | if (err < 0) { |
1409 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1410 | goto out_release; | |
1411 | } | |
1412 | ||
1413 | err = 0; | |
1414 | if (buf->sa_family == AF_INET6) { | |
1415 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1416 | sin6->sin6_scope_id = 0; | |
1417 | } | |
1418 | dprintk("RPC: %s succeeded\n", __func__); | |
1419 | ||
1420 | out_release: | |
1421 | sock_release(sock); | |
1422 | out: | |
1423 | return err; | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * Scraping a connected socket failed, so we don't have a useable | |
1428 | * local address. Fallback: generate an address that will prevent | |
1429 | * the server from calling us back. | |
1430 | * | |
1431 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1432 | * negative errno is returned. | |
1433 | */ | |
1434 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1435 | { | |
1436 | switch (family) { | |
1437 | case AF_INET: | |
1438 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1439 | return -EINVAL; | |
1440 | memcpy(buf, &rpc_inaddr_loopback, | |
1441 | sizeof(rpc_inaddr_loopback)); | |
1442 | break; | |
1443 | case AF_INET6: | |
1444 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1445 | return -EINVAL; | |
1446 | memcpy(buf, &rpc_in6addr_loopback, | |
1447 | sizeof(rpc_in6addr_loopback)); | |
0b161e63 | 1448 | break; |
2e738fdc CL |
1449 | default: |
1450 | dprintk("RPC: %s: address family not supported\n", | |
1451 | __func__); | |
1452 | return -EAFNOSUPPORT; | |
1453 | } | |
1454 | dprintk("RPC: %s: succeeded\n", __func__); | |
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | /** | |
1459 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1460 | * @clnt: RPC client structure | |
1461 | * @buf: target buffer | |
1462 | * @buflen: size of target buffer, in bytes | |
1463 | * | |
1464 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1465 | * otherwise, a negative errno is returned. | |
1466 | * | |
1467 | * This works even if the underlying transport is not currently connected, | |
1468 | * or if the upper layer never previously provided a source address. | |
1469 | * | |
1470 | * The result of this function call is transient: multiple calls in | |
1471 | * succession may give different results, depending on how local | |
1472 | * networking configuration changes over time. | |
1473 | */ | |
1474 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1475 | { | |
1476 | struct sockaddr_storage address; | |
1477 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1478 | struct rpc_xprt *xprt; | |
1479 | struct net *net; | |
1480 | size_t salen; | |
1481 | int err; | |
1482 | ||
1483 | rcu_read_lock(); | |
1484 | xprt = rcu_dereference(clnt->cl_xprt); | |
1485 | salen = xprt->addrlen; | |
1486 | memcpy(sap, &xprt->addr, salen); | |
1487 | net = get_net(xprt->xprt_net); | |
1488 | rcu_read_unlock(); | |
1489 | ||
1490 | rpc_set_port(sap, 0); | |
9b2c45d4 | 1491 | err = rpc_sockname(net, sap, salen, buf); |
2e738fdc CL |
1492 | put_net(net); |
1493 | if (err != 0) | |
1494 | /* Couldn't discover local address, return ANYADDR */ | |
1495 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1496 | return 0; | |
1497 | } | |
1498 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1499 | ||
1da177e4 LT |
1500 | void |
1501 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1502 | { | |
2446ab60 TM |
1503 | struct rpc_xprt *xprt; |
1504 | ||
1505 | rcu_read_lock(); | |
1506 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1507 | if (xprt->ops->set_buffer_size) |
1508 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1509 | rcu_read_unlock(); |
1da177e4 | 1510 | } |
e8914c65 | 1511 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1512 | |
2446ab60 TM |
1513 | /** |
1514 | * rpc_net_ns - Get the network namespace for this RPC client | |
1515 | * @clnt: RPC client to query | |
1516 | * | |
1517 | */ | |
1518 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1519 | { | |
1520 | struct net *ret; | |
1521 | ||
1522 | rcu_read_lock(); | |
1523 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1524 | rcu_read_unlock(); | |
1525 | return ret; | |
1526 | } | |
1527 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1528 | ||
1529 | /** | |
1530 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1531 | * @clnt: RPC client to query | |
1da177e4 LT |
1532 | * |
1533 | * For stream transports, this is one RPC record fragment (see RFC | |
1534 | * 1831), as we don't support multi-record requests yet. For datagram | |
1535 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1536 | * RPC header sizes. | |
1537 | */ | |
1538 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1539 | { | |
2446ab60 TM |
1540 | size_t ret; |
1541 | ||
1542 | rcu_read_lock(); | |
1543 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1544 | rcu_read_unlock(); | |
1545 | return ret; | |
1da177e4 | 1546 | } |
b86acd50 | 1547 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1548 | |
6b26cc8c CL |
1549 | /** |
1550 | * rpc_max_bc_payload - Get maximum backchannel payload size, in bytes | |
1551 | * @clnt: RPC client to query | |
1552 | */ | |
1553 | size_t rpc_max_bc_payload(struct rpc_clnt *clnt) | |
1554 | { | |
1555 | struct rpc_xprt *xprt; | |
1556 | size_t ret; | |
1557 | ||
1558 | rcu_read_lock(); | |
1559 | xprt = rcu_dereference(clnt->cl_xprt); | |
1560 | ret = xprt->ops->bc_maxpayload(xprt); | |
1561 | rcu_read_unlock(); | |
1562 | return ret; | |
1563 | } | |
1564 | EXPORT_SYMBOL_GPL(rpc_max_bc_payload); | |
1565 | ||
7402a4fe TM |
1566 | unsigned int rpc_num_bc_slots(struct rpc_clnt *clnt) |
1567 | { | |
1568 | struct rpc_xprt *xprt; | |
1569 | unsigned int ret; | |
1570 | ||
1571 | rcu_read_lock(); | |
1572 | xprt = rcu_dereference(clnt->cl_xprt); | |
1573 | ret = xprt->ops->bc_num_slots(xprt); | |
1574 | rcu_read_unlock(); | |
1575 | return ret; | |
1576 | } | |
1577 | EXPORT_SYMBOL_GPL(rpc_num_bc_slots); | |
1578 | ||
35f5a422 CL |
1579 | /** |
1580 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1581 | * @clnt: client to rebind | |
1582 | * | |
1583 | */ | |
1584 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1585 | { | |
2446ab60 TM |
1586 | if (clnt->cl_autobind) { |
1587 | rcu_read_lock(); | |
1588 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1589 | rcu_read_unlock(); | |
1590 | } | |
35f5a422 | 1591 | } |
b86acd50 | 1592 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1593 | |
9e6fa0bb TM |
1594 | static int |
1595 | __rpc_restart_call(struct rpc_task *task, void (*action)(struct rpc_task *)) | |
aae2006e | 1596 | { |
494314c4 | 1597 | task->tk_status = 0; |
5ad64b36 | 1598 | task->tk_rpc_status = 0; |
9e6fa0bb | 1599 | task->tk_action = action; |
f1f88fc7 | 1600 | return 1; |
aae2006e | 1601 | } |
aae2006e | 1602 | |
1da177e4 LT |
1603 | /* |
1604 | * Restart an (async) RPC call. Usually called from within the | |
1605 | * exit handler. | |
1606 | */ | |
f1f88fc7 | 1607 | int |
1da177e4 LT |
1608 | rpc_restart_call(struct rpc_task *task) |
1609 | { | |
9e6fa0bb | 1610 | return __rpc_restart_call(task, call_start); |
1da177e4 | 1611 | } |
e8914c65 | 1612 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1613 | |
9e6fa0bb TM |
1614 | /* |
1615 | * Restart an (async) RPC call from the call_prepare state. | |
1616 | * Usually called from within the exit handler. | |
1617 | */ | |
1618 | int | |
1619 | rpc_restart_call_prepare(struct rpc_task *task) | |
1620 | { | |
1621 | if (task->tk_ops->rpc_call_prepare != NULL) | |
1622 | return __rpc_restart_call(task, rpc_prepare_task); | |
1623 | return rpc_restart_call(task); | |
1624 | } | |
1625 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1626 | ||
b4b9d2cc JL |
1627 | const char |
1628 | *rpc_proc_name(const struct rpc_task *task) | |
3748f1e4 CL |
1629 | { |
1630 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1631 | ||
1632 | if (proc) { | |
1633 | if (proc->p_name) | |
1634 | return proc->p_name; | |
1635 | else | |
1636 | return "NULL"; | |
1637 | } else | |
1638 | return "no proc"; | |
1639 | } | |
3748f1e4 | 1640 | |
5ad64b36 TM |
1641 | static void |
1642 | __rpc_call_rpcerror(struct rpc_task *task, int tk_status, int rpc_status) | |
1643 | { | |
0125ecbb | 1644 | trace_rpc_call_rpcerror(task, tk_status, rpc_status); |
5ad64b36 TM |
1645 | task->tk_rpc_status = rpc_status; |
1646 | rpc_exit(task, tk_status); | |
1647 | } | |
1648 | ||
1649 | static void | |
1650 | rpc_call_rpcerror(struct rpc_task *task, int status) | |
1651 | { | |
1652 | __rpc_call_rpcerror(task, status, status); | |
1653 | } | |
1654 | ||
1da177e4 LT |
1655 | /* |
1656 | * 0. Initial state | |
1657 | * | |
1658 | * Other FSM states can be visited zero or more times, but | |
1659 | * this state is visited exactly once for each RPC. | |
1660 | */ | |
1661 | static void | |
1662 | call_start(struct rpc_task *task) | |
1663 | { | |
1664 | struct rpc_clnt *clnt = task->tk_client; | |
1c5876dd | 1665 | int idx = task->tk_msg.rpc_proc->p_statidx; |
1da177e4 | 1666 | |
c435da68 | 1667 | trace_rpc_request(task); |
1da177e4 | 1668 | |
1c5876dd CH |
1669 | /* Increment call count (version might not be valid for ping) */ |
1670 | if (clnt->cl_program->version[clnt->cl_vers]) | |
1671 | clnt->cl_program->version[clnt->cl_vers]->counts[idx]++; | |
1da177e4 LT |
1672 | clnt->cl_stats->rpccnt++; |
1673 | task->tk_action = call_reserve; | |
0f90be13 | 1674 | rpc_task_set_transport(task, clnt); |
1da177e4 LT |
1675 | } |
1676 | ||
1677 | /* | |
1678 | * 1. Reserve an RPC call slot | |
1679 | */ | |
1680 | static void | |
1681 | call_reserve(struct rpc_task *task) | |
1682 | { | |
1da177e4 LT |
1683 | task->tk_status = 0; |
1684 | task->tk_action = call_reserveresult; | |
1685 | xprt_reserve(task); | |
1686 | } | |
1687 | ||
ba60eb25 TM |
1688 | static void call_retry_reserve(struct rpc_task *task); |
1689 | ||
1da177e4 LT |
1690 | /* |
1691 | * 1b. Grok the result of xprt_reserve() | |
1692 | */ | |
1693 | static void | |
1694 | call_reserveresult(struct rpc_task *task) | |
1695 | { | |
1696 | int status = task->tk_status; | |
1697 | ||
1da177e4 LT |
1698 | /* |
1699 | * After a call to xprt_reserve(), we must have either | |
1700 | * a request slot or else an error status. | |
1701 | */ | |
1702 | task->tk_status = 0; | |
1703 | if (status >= 0) { | |
1704 | if (task->tk_rqstp) { | |
f2d47d02 | 1705 | task->tk_action = call_refresh; |
1da177e4 LT |
1706 | return; |
1707 | } | |
1708 | ||
5ad64b36 | 1709 | rpc_call_rpcerror(task, -EIO); |
1da177e4 LT |
1710 | return; |
1711 | } | |
1712 | ||
1da177e4 | 1713 | switch (status) { |
1afeaf5c TM |
1714 | case -ENOMEM: |
1715 | rpc_delay(task, HZ >> 2); | |
df561f66 | 1716 | fallthrough; |
1da177e4 | 1717 | case -EAGAIN: /* woken up; retry */ |
ba60eb25 | 1718 | task->tk_action = call_retry_reserve; |
1da177e4 | 1719 | return; |
1da177e4 | 1720 | default: |
5cd8b0d4 | 1721 | rpc_call_rpcerror(task, status); |
1da177e4 | 1722 | } |
1da177e4 LT |
1723 | } |
1724 | ||
ba60eb25 TM |
1725 | /* |
1726 | * 1c. Retry reserving an RPC call slot | |
1727 | */ | |
1728 | static void | |
1729 | call_retry_reserve(struct rpc_task *task) | |
1730 | { | |
ba60eb25 TM |
1731 | task->tk_status = 0; |
1732 | task->tk_action = call_reserveresult; | |
1733 | xprt_retry_reserve(task); | |
1734 | } | |
1735 | ||
1da177e4 | 1736 | /* |
55576244 BF |
1737 | * 2. Bind and/or refresh the credentials |
1738 | */ | |
1739 | static void | |
1740 | call_refresh(struct rpc_task *task) | |
1741 | { | |
55576244 BF |
1742 | task->tk_action = call_refreshresult; |
1743 | task->tk_status = 0; | |
1744 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1745 | rpcauth_refreshcred(task); | |
1746 | } | |
1747 | ||
1748 | /* | |
1749 | * 2a. Process the results of a credential refresh | |
1750 | */ | |
1751 | static void | |
1752 | call_refreshresult(struct rpc_task *task) | |
1753 | { | |
1754 | int status = task->tk_status; | |
1755 | ||
55576244 | 1756 | task->tk_status = 0; |
5fc43978 | 1757 | task->tk_action = call_refresh; |
55576244 | 1758 | switch (status) { |
5fc43978 | 1759 | case 0: |
6ff33b7d | 1760 | if (rpcauth_uptodatecred(task)) { |
5fc43978 | 1761 | task->tk_action = call_allocate; |
6ff33b7d WAA |
1762 | return; |
1763 | } | |
1764 | /* Use rate-limiting and a max number of retries if refresh | |
1765 | * had status 0 but failed to update the cred. | |
1766 | */ | |
df561f66 | 1767 | fallthrough; |
55576244 BF |
1768 | case -ETIMEDOUT: |
1769 | rpc_delay(task, 3*HZ); | |
df561f66 | 1770 | fallthrough; |
5fc43978 TM |
1771 | case -EAGAIN: |
1772 | status = -EACCES; | |
df561f66 | 1773 | fallthrough; |
f1ff0c27 | 1774 | case -EKEYEXPIRED: |
5fc43978 TM |
1775 | if (!task->tk_cred_retry) |
1776 | break; | |
1777 | task->tk_cred_retry--; | |
7c8099f6 | 1778 | trace_rpc_retry_refresh_status(task); |
5fc43978 | 1779 | return; |
a41b05ed N |
1780 | case -ENOMEM: |
1781 | rpc_delay(task, HZ >> 4); | |
1782 | return; | |
55576244 | 1783 | } |
7c8099f6 | 1784 | trace_rpc_refresh_status(task); |
5ad64b36 | 1785 | rpc_call_rpcerror(task, status); |
55576244 BF |
1786 | } |
1787 | ||
1788 | /* | |
1789 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1790 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1791 | */ |
1792 | static void | |
1793 | call_allocate(struct rpc_task *task) | |
1794 | { | |
2c94b8ec | 1795 | const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth; |
02107148 | 1796 | struct rpc_rqst *req = task->tk_rqstp; |
a4f0835c | 1797 | struct rpc_xprt *xprt = req->rq_xprt; |
499b4988 | 1798 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
5fe6eaa1 | 1799 | int status; |
1da177e4 | 1800 | |
2bea90d4 | 1801 | task->tk_status = 0; |
762e4e67 | 1802 | task->tk_action = call_encode; |
2bea90d4 | 1803 | |
af6b61d7 | 1804 | if (req->rq_buffer) |
1da177e4 LT |
1805 | return; |
1806 | ||
2bea90d4 CL |
1807 | if (proc->p_proc != 0) { |
1808 | BUG_ON(proc->p_arglen == 0); | |
1809 | if (proc->p_decode != NULL) | |
1810 | BUG_ON(proc->p_replen == 0); | |
1811 | } | |
1da177e4 | 1812 | |
2bea90d4 CL |
1813 | /* |
1814 | * Calculate the size (in quads) of the RPC call | |
1815 | * and reply headers, and convert both values | |
1816 | * to byte sizes. | |
1817 | */ | |
2c94b8ec CL |
1818 | req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) + |
1819 | proc->p_arglen; | |
2bea90d4 | 1820 | req->rq_callsize <<= 2; |
51314960 TM |
1821 | /* |
1822 | * Note: the reply buffer must at minimum allocate enough space | |
1823 | * for the 'struct accepted_reply' from RFC5531. | |
1824 | */ | |
1825 | req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + \ | |
1826 | max_t(size_t, proc->p_replen, 2); | |
2bea90d4 CL |
1827 | req->rq_rcvsize <<= 2; |
1828 | ||
5fe6eaa1 | 1829 | status = xprt->ops->buf_alloc(task); |
06e234c6 | 1830 | trace_rpc_buf_alloc(task, status); |
af6b61d7 | 1831 | if (status == 0) |
5fe6eaa1 CL |
1832 | return; |
1833 | if (status != -ENOMEM) { | |
5ad64b36 | 1834 | rpc_call_rpcerror(task, status); |
5fe6eaa1 CL |
1835 | return; |
1836 | } | |
46121cf7 | 1837 | |
5afa9133 | 1838 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1839 | task->tk_action = call_allocate; |
1da177e4 LT |
1840 | rpc_delay(task, HZ>>4); |
1841 | return; | |
1842 | } | |
1843 | ||
714fbc73 | 1844 | rpc_call_rpcerror(task, -ERESTARTSYS); |
1da177e4 LT |
1845 | } |
1846 | ||
7ebbbc6e | 1847 | static int |
940e3318 TM |
1848 | rpc_task_need_encode(struct rpc_task *task) |
1849 | { | |
762e4e67 TM |
1850 | return test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) == 0 && |
1851 | (!(task->tk_flags & RPC_TASK_SENT) || | |
1852 | !(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) || | |
1853 | xprt_request_need_retransmit(task)); | |
940e3318 TM |
1854 | } |
1855 | ||
1da177e4 | 1856 | static void |
b0e1c57e | 1857 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1858 | { |
1da177e4 | 1859 | struct rpc_rqst *req = task->tk_rqstp; |
e8680a24 | 1860 | struct xdr_stream xdr; |
1da177e4 | 1861 | |
b9c5bc03 CL |
1862 | xdr_buf_init(&req->rq_snd_buf, |
1863 | req->rq_buffer, | |
1864 | req->rq_callsize); | |
1865 | xdr_buf_init(&req->rq_rcv_buf, | |
68778945 | 1866 | req->rq_rbuffer, |
b9c5bc03 | 1867 | req->rq_rcvsize); |
1da177e4 | 1868 | |
cc204d01 | 1869 | req->rq_reply_bytes_recvd = 0; |
e8680a24 CL |
1870 | req->rq_snd_buf.head[0].iov_len = 0; |
1871 | xdr_init_encode(&xdr, &req->rq_snd_buf, | |
1872 | req->rq_snd_buf.head[0].iov_base, req); | |
1873 | if (rpc_encode_header(task, &xdr)) | |
1da177e4 | 1874 | return; |
b0e1c57e | 1875 | |
e8680a24 | 1876 | task->tk_status = rpcauth_wrap_req(task, &xdr); |
1da177e4 LT |
1877 | } |
1878 | ||
762e4e67 TM |
1879 | /* |
1880 | * 3. Encode arguments of an RPC call | |
1881 | */ | |
1882 | static void | |
1883 | call_encode(struct rpc_task *task) | |
1884 | { | |
1885 | if (!rpc_task_need_encode(task)) | |
1886 | goto out; | |
6387039d | 1887 | |
cc204d01 TM |
1888 | /* Dequeue task from the receive queue while we're encoding */ |
1889 | xprt_request_dequeue_xprt(task); | |
762e4e67 TM |
1890 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
1891 | rpc_xdr_encode(task); | |
eb07d5a4 N |
1892 | /* Add task to reply queue before transmission to avoid races */ |
1893 | if (task->tk_status == 0 && rpc_reply_expected(task)) | |
1894 | task->tk_status = xprt_request_enqueue_receive(task); | |
762e4e67 TM |
1895 | /* Did the encode result in an error condition? */ |
1896 | if (task->tk_status != 0) { | |
1897 | /* Was the error nonfatal? */ | |
97b78ae9 TM |
1898 | switch (task->tk_status) { |
1899 | case -EAGAIN: | |
1900 | case -ENOMEM: | |
762e4e67 | 1901 | rpc_delay(task, HZ >> 4); |
97b78ae9 TM |
1902 | break; |
1903 | case -EKEYEXPIRED: | |
9c5948c2 | 1904 | if (!task->tk_cred_retry) { |
ed06fce0 | 1905 | rpc_call_rpcerror(task, task->tk_status); |
9c5948c2 Z |
1906 | } else { |
1907 | task->tk_action = call_refresh; | |
1908 | task->tk_cred_retry--; | |
7c8099f6 | 1909 | trace_rpc_retry_refresh_status(task); |
9c5948c2 | 1910 | } |
97b78ae9 TM |
1911 | break; |
1912 | default: | |
5ad64b36 | 1913 | rpc_call_rpcerror(task, task->tk_status); |
97b78ae9 | 1914 | } |
762e4e67 TM |
1915 | return; |
1916 | } | |
1917 | ||
762e4e67 TM |
1918 | xprt_request_enqueue_transmit(task); |
1919 | out: | |
af6b61d7 TM |
1920 | task->tk_action = call_transmit; |
1921 | /* Check that the connection is OK */ | |
1922 | if (!xprt_bound(task->tk_xprt)) | |
1923 | task->tk_action = call_bind; | |
1924 | else if (!xprt_connected(task->tk_xprt)) | |
1925 | task->tk_action = call_connect; | |
762e4e67 TM |
1926 | } |
1927 | ||
03e51d32 TM |
1928 | /* |
1929 | * Helpers to check if the task was already transmitted, and | |
1930 | * to take action when that is the case. | |
1931 | */ | |
1932 | static bool | |
1933 | rpc_task_transmitted(struct rpc_task *task) | |
1934 | { | |
1935 | return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); | |
1936 | } | |
1937 | ||
1938 | static void | |
1939 | rpc_task_handle_transmitted(struct rpc_task *task) | |
1940 | { | |
1941 | xprt_end_transmit(task); | |
1942 | task->tk_action = call_transmit_status; | |
03e51d32 TM |
1943 | } |
1944 | ||
1da177e4 LT |
1945 | /* |
1946 | * 4. Get the server port number if not yet set | |
1947 | */ | |
1948 | static void | |
1949 | call_bind(struct rpc_task *task) | |
1950 | { | |
ad2368d6 | 1951 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1952 | |
03e51d32 TM |
1953 | if (rpc_task_transmitted(task)) { |
1954 | rpc_task_handle_transmitted(task); | |
1955 | return; | |
1956 | } | |
1957 | ||
009a82f6 TM |
1958 | if (xprt_bound(xprt)) { |
1959 | task->tk_action = call_connect; | |
009a82f6 TM |
1960 | return; |
1961 | } | |
1962 | ||
009a82f6 | 1963 | task->tk_action = call_bind_status; |
4d6c671a TM |
1964 | if (!xprt_prepare_transmit(task)) |
1965 | return; | |
1966 | ||
009a82f6 | 1967 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1968 | } |
1969 | ||
1970 | /* | |
da351878 CL |
1971 | * 4a. Sort out bind result |
1972 | */ | |
1973 | static void | |
1974 | call_bind_status(struct rpc_task *task) | |
1975 | { | |
bd736ed3 | 1976 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
906462af | 1977 | int status = -EIO; |
da351878 | 1978 | |
03e51d32 TM |
1979 | if (rpc_task_transmitted(task)) { |
1980 | rpc_task_handle_transmitted(task); | |
1981 | return; | |
1982 | } | |
1983 | ||
bd736ed3 TM |
1984 | if (task->tk_status >= 0) |
1985 | goto out_next; | |
1986 | if (xprt_bound(xprt)) { | |
da351878 | 1987 | task->tk_status = 0; |
bd736ed3 | 1988 | goto out_next; |
da351878 CL |
1989 | } |
1990 | ||
1991 | switch (task->tk_status) { | |
381ba74a | 1992 | case -ENOMEM: |
381ba74a | 1993 | rpc_delay(task, HZ >> 2); |
2429cbf6 | 1994 | goto retry_timeout; |
da351878 | 1995 | case -EACCES: |
42ebfc2c | 1996 | trace_rpcb_prog_unavail_err(task); |
b79dc8ce CL |
1997 | /* fail immediately if this is an RPC ping */ |
1998 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1999 | status = -EOPNOTSUPP; | |
2000 | break; | |
2001 | } | |
0b760113 TM |
2002 | if (task->tk_rebind_retry == 0) |
2003 | break; | |
2004 | task->tk_rebind_retry--; | |
ea635a51 | 2005 | rpc_delay(task, 3*HZ); |
da45828e | 2006 | goto retry_timeout; |
80f455da TM |
2007 | case -ENOBUFS: |
2008 | rpc_delay(task, HZ >> 2); | |
2009 | goto retry_timeout; | |
4d6c671a TM |
2010 | case -EAGAIN: |
2011 | goto retry_timeout; | |
da351878 | 2012 | case -ETIMEDOUT: |
42ebfc2c | 2013 | trace_rpcb_timeout_err(task); |
da45828e | 2014 | goto retry_timeout; |
da351878 | 2015 | case -EPFNOSUPPORT: |
906462af | 2016 | /* server doesn't support any rpcbind version we know of */ |
42ebfc2c | 2017 | trace_rpcb_bind_version_err(task); |
da351878 CL |
2018 | break; |
2019 | case -EPROTONOSUPPORT: | |
42ebfc2c | 2020 | trace_rpcb_bind_version_err(task); |
fdb63dcd | 2021 | goto retry_timeout; |
012da158 CL |
2022 | case -ECONNREFUSED: /* connection problems */ |
2023 | case -ECONNRESET: | |
df277270 | 2024 | case -ECONNABORTED: |
012da158 CL |
2025 | case -ENOTCONN: |
2026 | case -EHOSTDOWN: | |
eb5b46fa | 2027 | case -ENETDOWN: |
012da158 CL |
2028 | case -EHOSTUNREACH: |
2029 | case -ENETUNREACH: | |
2030 | case -EPIPE: | |
42ebfc2c | 2031 | trace_rpcb_unreachable_err(task); |
012da158 CL |
2032 | if (!RPC_IS_SOFTCONN(task)) { |
2033 | rpc_delay(task, 5*HZ); | |
2034 | goto retry_timeout; | |
2035 | } | |
2036 | status = task->tk_status; | |
2037 | break; | |
da351878 | 2038 | default: |
42ebfc2c | 2039 | trace_rpcb_unrecognized_err(task); |
da351878 CL |
2040 | } |
2041 | ||
5ad64b36 | 2042 | rpc_call_rpcerror(task, status); |
da351878 | 2043 | return; |
bd736ed3 TM |
2044 | out_next: |
2045 | task->tk_action = call_connect; | |
2046 | return; | |
da45828e | 2047 | retry_timeout: |
fdb63dcd | 2048 | task->tk_status = 0; |
4d6c671a | 2049 | task->tk_action = call_bind; |
cea57789 | 2050 | rpc_check_timeout(task); |
da351878 CL |
2051 | } |
2052 | ||
2053 | /* | |
2054 | * 4b. Connect to the RPC server | |
1da177e4 LT |
2055 | */ |
2056 | static void | |
2057 | call_connect(struct rpc_task *task) | |
2058 | { | |
ad2368d6 | 2059 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 2060 | |
03e51d32 TM |
2061 | if (rpc_task_transmitted(task)) { |
2062 | rpc_task_handle_transmitted(task); | |
2063 | return; | |
2064 | } | |
2065 | ||
009a82f6 TM |
2066 | if (xprt_connected(xprt)) { |
2067 | task->tk_action = call_transmit; | |
009a82f6 TM |
2068 | return; |
2069 | } | |
2070 | ||
009a82f6 TM |
2071 | task->tk_action = call_connect_status; |
2072 | if (task->tk_status < 0) | |
2073 | return; | |
2074 | if (task->tk_flags & RPC_TASK_NOCONNECT) { | |
5ad64b36 | 2075 | rpc_call_rpcerror(task, -ENOTCONN); |
009a82f6 | 2076 | return; |
1da177e4 | 2077 | } |
4d6c671a TM |
2078 | if (!xprt_prepare_transmit(task)) |
2079 | return; | |
009a82f6 | 2080 | xprt_connect(task); |
1da177e4 LT |
2081 | } |
2082 | ||
2083 | /* | |
da351878 | 2084 | * 4c. Sort out connect result |
1da177e4 LT |
2085 | */ |
2086 | static void | |
2087 | call_connect_status(struct rpc_task *task) | |
2088 | { | |
bd736ed3 | 2089 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 LT |
2090 | struct rpc_clnt *clnt = task->tk_client; |
2091 | int status = task->tk_status; | |
2092 | ||
03e51d32 TM |
2093 | if (rpc_task_transmitted(task)) { |
2094 | rpc_task_handle_transmitted(task); | |
9bd11523 TM |
2095 | return; |
2096 | } | |
2097 | ||
e671edb9 | 2098 | trace_rpc_connect_status(task); |
bd736ed3 TM |
2099 | |
2100 | if (task->tk_status == 0) { | |
2101 | clnt->cl_stats->netreconn++; | |
2102 | goto out_next; | |
2103 | } | |
2104 | if (xprt_connected(xprt)) { | |
2105 | task->tk_status = 0; | |
2106 | goto out_next; | |
2107 | } | |
2108 | ||
561ec160 | 2109 | task->tk_status = 0; |
1da177e4 | 2110 | switch (status) { |
3ed5e2a2 | 2111 | case -ECONNREFUSED: |
fd01b259 N |
2112 | /* A positive refusal suggests a rebind is needed. */ |
2113 | if (RPC_IS_SOFTCONN(task)) | |
2114 | break; | |
2115 | if (clnt->cl_autobind) { | |
2116 | rpc_force_rebind(clnt); | |
7b3fef8e | 2117 | goto out_retry; |
fd01b259 | 2118 | } |
df561f66 | 2119 | fallthrough; |
3ed5e2a2 | 2120 | case -ECONNRESET: |
df277270 | 2121 | case -ECONNABORTED: |
eb5b46fa | 2122 | case -ENETDOWN: |
3ed5e2a2 | 2123 | case -ENETUNREACH: |
df277270 | 2124 | case -EHOSTUNREACH: |
2fc193cf | 2125 | case -EPIPE: |
b8457606 | 2126 | case -EPROTO: |
2c2ee6d2 N |
2127 | xprt_conditional_disconnect(task->tk_rqstp->rq_xprt, |
2128 | task->tk_rqstp->rq_connect_cookie); | |
3ed5e2a2 TM |
2129 | if (RPC_IS_SOFTCONN(task)) |
2130 | break; | |
1fa3e2eb SD |
2131 | /* retry with existing socket, after a delay */ |
2132 | rpc_delay(task, 3*HZ); | |
df561f66 | 2133 | fallthrough; |
80f455da | 2134 | case -EADDRINUSE: |
0445f92c | 2135 | case -ENOTCONN: |
3ed5e2a2 | 2136 | case -EAGAIN: |
485f2251 | 2137 | case -ETIMEDOUT: |
6f081693 OK |
2138 | if (!(task->tk_flags & RPC_TASK_NO_ROUND_ROBIN) && |
2139 | (task->tk_flags & RPC_TASK_MOVEABLE) && | |
2140 | test_bit(XPRT_REMOVE, &xprt->state)) { | |
2141 | struct rpc_xprt *saved = task->tk_xprt; | |
2142 | struct rpc_xprt_switch *xps; | |
2143 | ||
2144 | rcu_read_lock(); | |
2145 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); | |
2146 | rcu_read_unlock(); | |
2147 | if (xps->xps_nxprts > 1) { | |
2148 | long value; | |
2149 | ||
2150 | xprt_release(task); | |
2151 | value = atomic_long_dec_return(&xprt->queuelen); | |
2152 | if (value == 0) | |
497e6464 OK |
2153 | rpc_xprt_switch_remove_xprt(xps, saved, |
2154 | true); | |
6f081693 OK |
2155 | xprt_put(saved); |
2156 | task->tk_xprt = NULL; | |
2157 | task->tk_action = call_start; | |
2158 | } | |
2159 | xprt_switch_put(xps); | |
2160 | if (!task->tk_xprt) | |
2161 | return; | |
2162 | } | |
7b3fef8e | 2163 | goto out_retry; |
80f455da TM |
2164 | case -ENOBUFS: |
2165 | rpc_delay(task, HZ >> 2); | |
2166 | goto out_retry; | |
1da177e4 | 2167 | } |
5ad64b36 | 2168 | rpc_call_rpcerror(task, status); |
7b3fef8e | 2169 | return; |
bd736ed3 TM |
2170 | out_next: |
2171 | task->tk_action = call_transmit; | |
2172 | return; | |
7b3fef8e TM |
2173 | out_retry: |
2174 | /* Check for timeouts before looping back to call_bind */ | |
2175 | task->tk_action = call_bind; | |
2176 | rpc_check_timeout(task); | |
1da177e4 LT |
2177 | } |
2178 | ||
2179 | /* | |
2180 | * 5. Transmit the RPC request, and wait for reply | |
2181 | */ | |
2182 | static void | |
2183 | call_transmit(struct rpc_task *task) | |
2184 | { | |
03e51d32 TM |
2185 | if (rpc_task_transmitted(task)) { |
2186 | rpc_task_handle_transmitted(task); | |
2187 | return; | |
2188 | } | |
2189 | ||
ed7dc973 | 2190 | task->tk_action = call_transmit_status; |
009a82f6 TM |
2191 | if (!xprt_prepare_transmit(task)) |
2192 | return; | |
2193 | task->tk_status = 0; | |
c544577d | 2194 | if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) { |
009a82f6 TM |
2195 | if (!xprt_connected(task->tk_xprt)) { |
2196 | task->tk_status = -ENOTCONN; | |
c544577d | 2197 | return; |
ed7dc973 | 2198 | } |
009a82f6 | 2199 | xprt_transmit(task); |
c544577d | 2200 | } |
c544577d | 2201 | xprt_end_transmit(task); |
e0ab53de TM |
2202 | } |
2203 | ||
2204 | /* | |
2205 | * 5a. Handle cleanup after a transmission | |
2206 | */ | |
2207 | static void | |
2208 | call_transmit_status(struct rpc_task *task) | |
2209 | { | |
2210 | task->tk_action = call_status; | |
206a134b CL |
2211 | |
2212 | /* | |
2213 | * Common case: success. Force the compiler to put this | |
2214 | * test first. | |
2215 | */ | |
009a82f6 | 2216 | if (rpc_task_transmitted(task)) { |
a7b1a483 TM |
2217 | task->tk_status = 0; |
2218 | xprt_request_wait_receive(task); | |
206a134b CL |
2219 | return; |
2220 | } | |
2221 | ||
15f081ca | 2222 | switch (task->tk_status) { |
15f081ca | 2223 | default: |
75891f50 | 2224 | break; |
78b576ce | 2225 | case -EBADMSG: |
762e4e67 TM |
2226 | task->tk_status = 0; |
2227 | task->tk_action = call_encode; | |
78b576ce | 2228 | break; |
15f081ca TM |
2229 | /* |
2230 | * Special cases: if we've been waiting on the | |
2231 | * socket's write_space() callback, or if the | |
2232 | * socket just returned a connection error, | |
2233 | * then hold onto the transport lock. | |
2234 | */ | |
d3c15033 | 2235 | case -ENOMEM: |
78b576ce TM |
2236 | case -ENOBUFS: |
2237 | rpc_delay(task, HZ>>2); | |
df561f66 | 2238 | fallthrough; |
c544577d | 2239 | case -EBADSLT: |
78b576ce TM |
2240 | case -EAGAIN: |
2241 | task->tk_action = call_transmit; | |
2242 | task->tk_status = 0; | |
2243 | break; | |
15f081ca | 2244 | case -ECONNREFUSED: |
15f081ca | 2245 | case -EHOSTDOWN: |
eb5b46fa | 2246 | case -ENETDOWN: |
15f081ca TM |
2247 | case -EHOSTUNREACH: |
2248 | case -ENETUNREACH: | |
3dedbb5c | 2249 | case -EPERM: |
09a21c41 | 2250 | if (RPC_IS_SOFTCONN(task)) { |
a25a4cb3 CL |
2251 | if (!task->tk_msg.rpc_proc->p_proc) |
2252 | trace_xprt_ping(task->tk_xprt, | |
2253 | task->tk_status); | |
5ad64b36 | 2254 | rpc_call_rpcerror(task, task->tk_status); |
7b3fef8e | 2255 | return; |
09a21c41 | 2256 | } |
df561f66 | 2257 | fallthrough; |
09a21c41 | 2258 | case -ECONNRESET: |
df277270 | 2259 | case -ECONNABORTED: |
3913c78c | 2260 | case -EADDRINUSE: |
09a21c41 | 2261 | case -ENOTCONN: |
c8485e4d | 2262 | case -EPIPE: |
ed7dc973 TM |
2263 | task->tk_action = call_bind; |
2264 | task->tk_status = 0; | |
7ebbbc6e | 2265 | break; |
15f081ca | 2266 | } |
7b3fef8e | 2267 | rpc_check_timeout(task); |
1da177e4 LT |
2268 | } |
2269 | ||
9e00abc3 | 2270 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
477687e1 TM |
2271 | static void call_bc_transmit(struct rpc_task *task); |
2272 | static void call_bc_transmit_status(struct rpc_task *task); | |
2273 | ||
2274 | static void | |
2275 | call_bc_encode(struct rpc_task *task) | |
2276 | { | |
2277 | xprt_request_enqueue_transmit(task); | |
2278 | task->tk_action = call_bc_transmit; | |
2279 | } | |
2280 | ||
55ae1aab RL |
2281 | /* |
2282 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
2283 | * addition, disconnect on connectivity errors. | |
2284 | */ | |
2285 | static void | |
2286 | call_bc_transmit(struct rpc_task *task) | |
2287 | { | |
477687e1 TM |
2288 | task->tk_action = call_bc_transmit_status; |
2289 | if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) { | |
2290 | if (!xprt_prepare_transmit(task)) | |
2291 | return; | |
2292 | task->tk_status = 0; | |
2293 | xprt_transmit(task); | |
55ae1aab | 2294 | } |
477687e1 TM |
2295 | xprt_end_transmit(task); |
2296 | } | |
55ae1aab | 2297 | |
477687e1 TM |
2298 | static void |
2299 | call_bc_transmit_status(struct rpc_task *task) | |
2300 | { | |
2301 | struct rpc_rqst *req = task->tk_rqstp; | |
1193d58f | 2302 | |
a7b1a483 TM |
2303 | if (rpc_task_transmitted(task)) |
2304 | task->tk_status = 0; | |
2305 | ||
55ae1aab RL |
2306 | switch (task->tk_status) { |
2307 | case 0: | |
2308 | /* Success */ | |
eb5b46fa | 2309 | case -ENETDOWN: |
55ae1aab RL |
2310 | case -EHOSTDOWN: |
2311 | case -EHOSTUNREACH: | |
2312 | case -ENETUNREACH: | |
3832591e TM |
2313 | case -ECONNRESET: |
2314 | case -ECONNREFUSED: | |
2315 | case -EADDRINUSE: | |
2316 | case -ENOTCONN: | |
2317 | case -EPIPE: | |
2318 | break; | |
d3c15033 | 2319 | case -ENOMEM: |
477687e1 TM |
2320 | case -ENOBUFS: |
2321 | rpc_delay(task, HZ>>2); | |
df561f66 | 2322 | fallthrough; |
477687e1 | 2323 | case -EBADSLT: |
c544577d | 2324 | case -EAGAIN: |
477687e1 TM |
2325 | task->tk_status = 0; |
2326 | task->tk_action = call_bc_transmit; | |
2327 | return; | |
55ae1aab RL |
2328 | case -ETIMEDOUT: |
2329 | /* | |
2330 | * Problem reaching the server. Disconnect and let the | |
2331 | * forechannel reestablish the connection. The server will | |
2332 | * have to retransmit the backchannel request and we'll | |
2333 | * reprocess it. Since these ops are idempotent, there's no | |
2334 | * need to cache our reply at this time. | |
2335 | */ | |
2336 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
2337 | "error: %d\n", task->tk_status); | |
a4f0835c | 2338 | xprt_conditional_disconnect(req->rq_xprt, |
55ae1aab RL |
2339 | req->rq_connect_cookie); |
2340 | break; | |
2341 | default: | |
2342 | /* | |
2343 | * We were unable to reply and will have to drop the | |
2344 | * request. The server should reconnect and retransmit. | |
2345 | */ | |
55ae1aab RL |
2346 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
2347 | "error: %d\n", task->tk_status); | |
2348 | break; | |
2349 | } | |
1193d58f | 2350 | task->tk_action = rpc_exit_task; |
55ae1aab | 2351 | } |
9e00abc3 | 2352 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 2353 | |
1da177e4 LT |
2354 | /* |
2355 | * 6. Sort out the RPC call status | |
2356 | */ | |
2357 | static void | |
2358 | call_status(struct rpc_task *task) | |
2359 | { | |
2360 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 LT |
2361 | int status; |
2362 | ||
a25a4cb3 CL |
2363 | if (!task->tk_msg.rpc_proc->p_proc) |
2364 | trace_xprt_ping(task->tk_xprt, task->tk_status); | |
2365 | ||
1da177e4 LT |
2366 | status = task->tk_status; |
2367 | if (status >= 0) { | |
2368 | task->tk_action = call_decode; | |
2369 | return; | |
2370 | } | |
2371 | ||
5753cba1 | 2372 | trace_rpc_call_status(task); |
1da177e4 LT |
2373 | task->tk_status = 0; |
2374 | switch(status) { | |
76303992 | 2375 | case -EHOSTDOWN: |
eb5b46fa | 2376 | case -ENETDOWN: |
76303992 TM |
2377 | case -EHOSTUNREACH: |
2378 | case -ENETUNREACH: | |
3dedbb5c | 2379 | case -EPERM: |
cea57789 TM |
2380 | if (RPC_IS_SOFTCONN(task)) |
2381 | goto out_exit; | |
76303992 TM |
2382 | /* |
2383 | * Delay any retries for 3 seconds, then handle as if it | |
2384 | * were a timeout. | |
2385 | */ | |
2386 | rpc_delay(task, 3*HZ); | |
df561f66 | 2387 | fallthrough; |
1da177e4 | 2388 | case -ETIMEDOUT: |
1da177e4 LT |
2389 | break; |
2390 | case -ECONNREFUSED: | |
df277270 TM |
2391 | case -ECONNRESET: |
2392 | case -ECONNABORTED: | |
ec6017d9 | 2393 | case -ENOTCONN: |
35f5a422 | 2394 | rpc_force_rebind(clnt); |
c82e5472 | 2395 | break; |
3913c78c | 2396 | case -EADDRINUSE: |
c8485e4d | 2397 | rpc_delay(task, 3*HZ); |
df561f66 | 2398 | fallthrough; |
c8485e4d | 2399 | case -EPIPE: |
1da177e4 | 2400 | case -EAGAIN: |
1da177e4 | 2401 | break; |
9d82819d TM |
2402 | case -ENFILE: |
2403 | case -ENOBUFS: | |
2404 | case -ENOMEM: | |
2405 | rpc_delay(task, HZ>>2); | |
2406 | break; | |
1da177e4 LT |
2407 | case -EIO: |
2408 | /* shutdown or soft timeout */ | |
cea57789 | 2409 | goto out_exit; |
1da177e4 | 2410 | default: |
b6b6152c OK |
2411 | if (clnt->cl_chatty) |
2412 | printk("%s: RPC call returned error %d\n", | |
55909f21 | 2413 | clnt->cl_program->name, -status); |
cea57789 | 2414 | goto out_exit; |
1da177e4 | 2415 | } |
cea57789 | 2416 | task->tk_action = call_encode; |
88428cc4 OK |
2417 | if (status != -ECONNRESET && status != -ECONNABORTED) |
2418 | rpc_check_timeout(task); | |
cea57789 TM |
2419 | return; |
2420 | out_exit: | |
5ad64b36 | 2421 | rpc_call_rpcerror(task, status); |
1da177e4 LT |
2422 | } |
2423 | ||
d84dd3fb TM |
2424 | static bool |
2425 | rpc_check_connected(const struct rpc_rqst *req) | |
2426 | { | |
2427 | /* No allocated request or transport? return true */ | |
2428 | if (!req || !req->rq_xprt) | |
2429 | return true; | |
2430 | return xprt_connected(req->rq_xprt); | |
2431 | } | |
2432 | ||
1da177e4 | 2433 | static void |
7b3fef8e | 2434 | rpc_check_timeout(struct rpc_task *task) |
1da177e4 LT |
2435 | { |
2436 | struct rpc_clnt *clnt = task->tk_client; | |
2437 | ||
ce99aa62 CL |
2438 | if (RPC_SIGNALLED(task)) { |
2439 | rpc_call_rpcerror(task, -ERESTARTSYS); | |
2440 | return; | |
2441 | } | |
2442 | ||
7b3fef8e TM |
2443 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) |
2444 | return; | |
1da177e4 | 2445 | |
914cdcc7 | 2446 | trace_rpc_timeout_status(task); |
ef759a2e CL |
2447 | task->tk_timeouts++; |
2448 | ||
d84dd3fb | 2449 | if (RPC_IS_SOFTCONN(task) && !rpc_check_connected(task->tk_rqstp)) { |
5ad64b36 | 2450 | rpc_call_rpcerror(task, -ETIMEDOUT); |
3a28becc CL |
2451 | return; |
2452 | } | |
d84dd3fb | 2453 | |
1da177e4 | 2454 | if (RPC_IS_SOFT(task)) { |
e4ec48d3 TM |
2455 | /* |
2456 | * Once a "no retrans timeout" soft tasks (a.k.a NFSv4) has | |
2457 | * been sent, it should time out only if the transport | |
2458 | * connection gets terminally broken. | |
2459 | */ | |
2460 | if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) && | |
2461 | rpc_check_connected(task->tk_rqstp)) | |
2462 | return; | |
2463 | ||
cac5d07e | 2464 | if (clnt->cl_chatty) { |
0729d995 TM |
2465 | pr_notice_ratelimited( |
2466 | "%s: server %s not responding, timed out\n", | |
55909f21 | 2467 | clnt->cl_program->name, |
fb43d172 | 2468 | task->tk_xprt->servername); |
cac5d07e | 2469 | } |
7494d00c | 2470 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
5ad64b36 | 2471 | rpc_call_rpcerror(task, -ETIMEDOUT); |
7494d00c | 2472 | else |
5ad64b36 | 2473 | __rpc_call_rpcerror(task, -EIO, -ETIMEDOUT); |
1da177e4 LT |
2474 | return; |
2475 | } | |
2476 | ||
f518e35a | 2477 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 2478 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 | 2479 | if (clnt->cl_chatty) { |
0729d995 TM |
2480 | pr_notice_ratelimited( |
2481 | "%s: server %s not responding, still trying\n", | |
2482 | clnt->cl_program->name, | |
2483 | task->tk_xprt->servername); | |
4e0038b6 | 2484 | } |
1da177e4 | 2485 | } |
35f5a422 | 2486 | rpc_force_rebind(clnt); |
b48633bd TM |
2487 | /* |
2488 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
2489 | * event? RFC2203 requires the server to drop all such requests. | |
2490 | */ | |
2491 | rpcauth_invalcred(task); | |
7b3fef8e | 2492 | } |
1da177e4 | 2493 | |
1da177e4 LT |
2494 | /* |
2495 | * 7. Decode the RPC reply | |
2496 | */ | |
2497 | static void | |
2498 | call_decode(struct rpc_task *task) | |
2499 | { | |
2500 | struct rpc_clnt *clnt = task->tk_client; | |
2501 | struct rpc_rqst *req = task->tk_rqstp; | |
a0584ee9 | 2502 | struct xdr_stream xdr; |
9ba82886 | 2503 | int err; |
1da177e4 | 2504 | |
a0584ee9 | 2505 | if (!task->tk_msg.rpc_proc->p_decode) { |
9ee94d3e TM |
2506 | task->tk_action = rpc_exit_task; |
2507 | return; | |
2508 | } | |
2509 | ||
f518e35a | 2510 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 | 2511 | if (clnt->cl_chatty) { |
0729d995 | 2512 | pr_notice_ratelimited("%s: server %s OK\n", |
55909f21 | 2513 | clnt->cl_program->name, |
fb43d172 | 2514 | task->tk_xprt->servername); |
4e0038b6 | 2515 | } |
1da177e4 LT |
2516 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
2517 | } | |
2518 | ||
9ba82886 TM |
2519 | /* |
2520 | * Did we ever call xprt_complete_rqst()? If not, we should assume | |
2521 | * the message is incomplete. | |
2522 | */ | |
2523 | err = -EAGAIN; | |
2524 | if (!req->rq_reply_bytes_recvd) | |
2525 | goto out; | |
2526 | ||
f8f7e0fb BL |
2527 | /* Ensure that we see all writes made by xprt_complete_rqst() |
2528 | * before it changed req->rq_reply_bytes_recvd. | |
2529 | */ | |
2530 | smp_rmb(); | |
2531 | ||
1da177e4 | 2532 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
c509f15a | 2533 | trace_rpc_xdr_recvfrom(task, &req->rq_rcv_buf); |
1da177e4 LT |
2534 | |
2535 | /* Check that the softirq receive buffer is valid */ | |
2536 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
2537 | sizeof(req->rq_rcv_buf)) != 0); | |
2538 | ||
a0584ee9 CL |
2539 | xdr_init_decode(&xdr, &req->rq_rcv_buf, |
2540 | req->rq_rcv_buf.head[0].iov_base, req); | |
9ba82886 TM |
2541 | err = rpc_decode_header(task, &xdr); |
2542 | out: | |
2543 | switch (err) { | |
a0584ee9 CL |
2544 | case 0: |
2545 | task->tk_action = rpc_exit_task; | |
2546 | task->tk_status = rpcauth_unwrap_resp(task, &xdr); | |
abbcf28f | 2547 | return; |
a0584ee9 | 2548 | case -EAGAIN: |
a0584ee9 | 2549 | task->tk_status = 0; |
7987b694 TM |
2550 | if (task->tk_client->cl_discrtry) |
2551 | xprt_conditional_disconnect(req->rq_xprt, | |
2552 | req->rq_connect_cookie); | |
cea57789 TM |
2553 | task->tk_action = call_encode; |
2554 | rpc_check_timeout(task); | |
7987b694 TM |
2555 | break; |
2556 | case -EKEYREJECTED: | |
2557 | task->tk_action = call_reserve; | |
2558 | rpc_check_timeout(task); | |
2559 | rpcauth_invalcred(task); | |
2560 | /* Ensure we obtain a new XID if we retry! */ | |
2561 | xprt_release(task); | |
24b74bf0 | 2562 | } |
1da177e4 LT |
2563 | } |
2564 | ||
e8680a24 CL |
2565 | static int |
2566 | rpc_encode_header(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 LT |
2567 | { |
2568 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2569 | struct rpc_rqst *req = task->tk_rqstp; |
e8680a24 CL |
2570 | __be32 *p; |
2571 | int error; | |
2572 | ||
2573 | error = -EMSGSIZE; | |
2574 | p = xdr_reserve_space(xdr, RPC_CALLHDRSIZE << 2); | |
2575 | if (!p) | |
2576 | goto out_fail; | |
2577 | *p++ = req->rq_xid; | |
2578 | *p++ = rpc_call; | |
2579 | *p++ = cpu_to_be32(RPC_VERSION); | |
2580 | *p++ = cpu_to_be32(clnt->cl_prog); | |
2581 | *p++ = cpu_to_be32(clnt->cl_vers); | |
2582 | *p = cpu_to_be32(task->tk_msg.rpc_proc->p_proc); | |
2583 | ||
2584 | error = rpcauth_marshcred(task, xdr); | |
2585 | if (error < 0) | |
2586 | goto out_fail; | |
2587 | return 0; | |
2588 | out_fail: | |
2589 | trace_rpc_bad_callhdr(task); | |
714fbc73 | 2590 | rpc_call_rpcerror(task, error); |
e8680a24 | 2591 | return error; |
1da177e4 LT |
2592 | } |
2593 | ||
a0584ee9 CL |
2594 | static noinline int |
2595 | rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 | 2596 | { |
4e0038b6 | 2597 | struct rpc_clnt *clnt = task->tk_client; |
eb90a16e | 2598 | int error; |
a0584ee9 | 2599 | __be32 *p; |
1da177e4 | 2600 | |
7f5667a5 CL |
2601 | /* RFC-1014 says that the representation of XDR data must be a |
2602 | * multiple of four bytes | |
2603 | * - if it isn't pointer subtraction in the NFS client may give | |
2604 | * undefined results | |
2605 | */ | |
2606 | if (task->tk_rqstp->rq_rcv_buf.len & 3) | |
eb90a16e | 2607 | goto out_unparsable; |
1da177e4 | 2608 | |
a0584ee9 CL |
2609 | p = xdr_inline_decode(xdr, 3 * sizeof(*p)); |
2610 | if (!p) | |
2611 | goto out_unparsable; | |
7f5667a5 CL |
2612 | p++; /* skip XID */ |
2613 | if (*p++ != rpc_reply) | |
2614 | goto out_unparsable; | |
2615 | if (*p++ != rpc_msg_accepted) | |
2616 | goto out_msg_denied; | |
f4a2e418 | 2617 | |
a0584ee9 CL |
2618 | error = rpcauth_checkverf(task, xdr); |
2619 | if (error) | |
7f5667a5 CL |
2620 | goto out_verifier; |
2621 | ||
a0584ee9 CL |
2622 | p = xdr_inline_decode(xdr, sizeof(*p)); |
2623 | if (!p) | |
7f5667a5 | 2624 | goto out_unparsable; |
a0584ee9 | 2625 | switch (*p) { |
7f5667a5 | 2626 | case rpc_success: |
a0584ee9 | 2627 | return 0; |
7f5667a5 CL |
2628 | case rpc_prog_unavail: |
2629 | trace_rpc__prog_unavail(task); | |
cdf47706 AG |
2630 | error = -EPFNOSUPPORT; |
2631 | goto out_err; | |
7f5667a5 CL |
2632 | case rpc_prog_mismatch: |
2633 | trace_rpc__prog_mismatch(task); | |
cdf47706 AG |
2634 | error = -EPROTONOSUPPORT; |
2635 | goto out_err; | |
7f5667a5 CL |
2636 | case rpc_proc_unavail: |
2637 | trace_rpc__proc_unavail(task); | |
cdf47706 AG |
2638 | error = -EOPNOTSUPP; |
2639 | goto out_err; | |
7f5667a5 | 2640 | case rpc_garbage_args: |
928d42f7 | 2641 | case rpc_system_err: |
7f5667a5 | 2642 | trace_rpc__garbage_args(task); |
eb90a16e | 2643 | error = -EIO; |
7f5667a5 | 2644 | break; |
1da177e4 | 2645 | default: |
eb90a16e | 2646 | goto out_unparsable; |
1da177e4 LT |
2647 | } |
2648 | ||
abbcf28f | 2649 | out_garbage: |
4e0038b6 | 2650 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2651 | if (task->tk_garb_retry) { |
2652 | task->tk_garb_retry--; | |
762e4e67 | 2653 | task->tk_action = call_encode; |
a0584ee9 | 2654 | return -EAGAIN; |
1da177e4 | 2655 | } |
1da177e4 | 2656 | out_err: |
714fbc73 | 2657 | rpc_call_rpcerror(task, error); |
a0584ee9 | 2658 | return error; |
7f5667a5 | 2659 | |
7f5667a5 CL |
2660 | out_unparsable: |
2661 | trace_rpc__unparsable(task); | |
2662 | error = -EIO; | |
abbcf28f | 2663 | goto out_garbage; |
7f5667a5 CL |
2664 | |
2665 | out_verifier: | |
2666 | trace_rpc_bad_verifier(task); | |
0701214c | 2667 | goto out_err; |
7f5667a5 CL |
2668 | |
2669 | out_msg_denied: | |
eb90a16e | 2670 | error = -EACCES; |
a0584ee9 CL |
2671 | p = xdr_inline_decode(xdr, sizeof(*p)); |
2672 | if (!p) | |
2673 | goto out_unparsable; | |
7f5667a5 CL |
2674 | switch (*p++) { |
2675 | case rpc_auth_error: | |
2676 | break; | |
2677 | case rpc_mismatch: | |
2678 | trace_rpc__mismatch(task); | |
2679 | error = -EPROTONOSUPPORT; | |
2680 | goto out_err; | |
2681 | default: | |
eb90a16e | 2682 | goto out_unparsable; |
7f5667a5 CL |
2683 | } |
2684 | ||
a0584ee9 CL |
2685 | p = xdr_inline_decode(xdr, sizeof(*p)); |
2686 | if (!p) | |
2687 | goto out_unparsable; | |
7f5667a5 CL |
2688 | switch (*p++) { |
2689 | case rpc_autherr_rejectedcred: | |
2690 | case rpc_autherr_rejectedverf: | |
2691 | case rpcsec_gsserr_credproblem: | |
2692 | case rpcsec_gsserr_ctxproblem: | |
2693 | if (!task->tk_cred_retry) | |
2694 | break; | |
2695 | task->tk_cred_retry--; | |
2696 | trace_rpc__stale_creds(task); | |
7987b694 | 2697 | return -EKEYREJECTED; |
7f5667a5 CL |
2698 | case rpc_autherr_badcred: |
2699 | case rpc_autherr_badverf: | |
2700 | /* possibly garbled cred/verf? */ | |
2701 | if (!task->tk_garb_retry) | |
2702 | break; | |
2703 | task->tk_garb_retry--; | |
2704 | trace_rpc__bad_creds(task); | |
2705 | task->tk_action = call_encode; | |
a0584ee9 | 2706 | return -EAGAIN; |
7f5667a5 CL |
2707 | case rpc_autherr_tooweak: |
2708 | trace_rpc__auth_tooweak(task); | |
2709 | pr_warn("RPC: server %s requires stronger authentication.\n", | |
2710 | task->tk_xprt->servername); | |
2711 | break; | |
2712 | default: | |
eb90a16e | 2713 | goto out_unparsable; |
7f5667a5 CL |
2714 | } |
2715 | goto out_err; | |
1da177e4 | 2716 | } |
5ee0ed7d | 2717 | |
c512f36b CH |
2718 | static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr, |
2719 | const void *obj) | |
5ee0ed7d | 2720 | { |
5ee0ed7d TM |
2721 | } |
2722 | ||
73c8dc13 CH |
2723 | static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr, |
2724 | void *obj) | |
5ee0ed7d TM |
2725 | { |
2726 | return 0; | |
2727 | } | |
2728 | ||
499b4988 | 2729 | static const struct rpc_procinfo rpcproc_null = { |
5ee0ed7d TM |
2730 | .p_encode = rpcproc_encode_null, |
2731 | .p_decode = rpcproc_decode_null, | |
2732 | }; | |
2733 | ||
fd13359f TM |
2734 | static const struct rpc_procinfo rpcproc_null_noreply = { |
2735 | .p_encode = rpcproc_encode_null, | |
2736 | }; | |
2737 | ||
823c73d0 CL |
2738 | static void |
2739 | rpc_null_call_prepare(struct rpc_task *task, void *data) | |
2740 | { | |
2741 | task->tk_flags &= ~RPC_TASK_NO_RETRANS_TIMEOUT; | |
2742 | rpc_call_start(task); | |
2743 | } | |
2744 | ||
2745 | static const struct rpc_call_ops rpc_null_ops = { | |
2746 | .rpc_call_prepare = rpc_null_call_prepare, | |
2747 | .rpc_call_done = rpc_default_callback, | |
2748 | }; | |
2749 | ||
7f554890 TM |
2750 | static |
2751 | struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt, | |
2752 | struct rpc_xprt *xprt, struct rpc_cred *cred, int flags, | |
2753 | const struct rpc_call_ops *ops, void *data) | |
5e1550d6 TM |
2754 | { |
2755 | struct rpc_message msg = { | |
2756 | .rpc_proc = &rpcproc_null, | |
5e1550d6 | 2757 | }; |
84115e1c TM |
2758 | struct rpc_task_setup task_setup_data = { |
2759 | .rpc_client = clnt, | |
7f554890 | 2760 | .rpc_xprt = xprt, |
84115e1c | 2761 | .rpc_message = &msg, |
1de7eea9 | 2762 | .rpc_op_cred = cred, |
823c73d0 | 2763 | .callback_ops = ops ?: &rpc_null_ops, |
7f554890 | 2764 | .callback_data = data, |
841a2ed9 CL |
2765 | .flags = flags | RPC_TASK_SOFT | RPC_TASK_SOFTCONN | |
2766 | RPC_TASK_NULLCREDS, | |
84115e1c | 2767 | }; |
7f554890 | 2768 | |
c970aa85 | 2769 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2770 | } |
7f554890 TM |
2771 | |
2772 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) | |
2773 | { | |
2774 | return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL); | |
2775 | } | |
e8914c65 | 2776 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2777 | |
aede5172 CL |
2778 | static int rpc_ping(struct rpc_clnt *clnt) |
2779 | { | |
2780 | struct rpc_task *task; | |
2781 | int status; | |
2782 | ||
2783 | task = rpc_call_null_helper(clnt, NULL, NULL, 0, NULL, NULL); | |
2784 | if (IS_ERR(task)) | |
2785 | return PTR_ERR(task); | |
2786 | status = task->tk_status; | |
fd13359f TM |
2787 | rpc_put_task(task); |
2788 | return status; | |
2789 | } | |
2790 | ||
2791 | static int rpc_ping_noreply(struct rpc_clnt *clnt) | |
2792 | { | |
2793 | struct rpc_message msg = { | |
2794 | .rpc_proc = &rpcproc_null_noreply, | |
2795 | }; | |
2796 | struct rpc_task_setup task_setup_data = { | |
2797 | .rpc_client = clnt, | |
2798 | .rpc_message = &msg, | |
2799 | .callback_ops = &rpc_null_ops, | |
2800 | .flags = RPC_TASK_SOFT | RPC_TASK_SOFTCONN | RPC_TASK_NULLCREDS, | |
2801 | }; | |
2802 | struct rpc_task *task; | |
2803 | int status; | |
2804 | ||
2805 | task = rpc_run_task(&task_setup_data); | |
2806 | if (IS_ERR(task)) | |
2807 | return PTR_ERR(task); | |
2808 | status = task->tk_status; | |
aede5172 CL |
2809 | rpc_put_task(task); |
2810 | return status; | |
2811 | } | |
2812 | ||
7f554890 TM |
2813 | struct rpc_cb_add_xprt_calldata { |
2814 | struct rpc_xprt_switch *xps; | |
2815 | struct rpc_xprt *xprt; | |
2816 | }; | |
2817 | ||
2818 | static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata) | |
2819 | { | |
2820 | struct rpc_cb_add_xprt_calldata *data = calldata; | |
2821 | ||
2822 | if (task->tk_status == 0) | |
2823 | rpc_xprt_switch_add_xprt(data->xps, data->xprt); | |
2824 | } | |
2825 | ||
2826 | static void rpc_cb_add_xprt_release(void *calldata) | |
2827 | { | |
2828 | struct rpc_cb_add_xprt_calldata *data = calldata; | |
2829 | ||
2830 | xprt_put(data->xprt); | |
2831 | xprt_switch_put(data->xps); | |
2832 | kfree(data); | |
2833 | } | |
2834 | ||
ce272302 | 2835 | static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = { |
823c73d0 | 2836 | .rpc_call_prepare = rpc_null_call_prepare, |
7f554890 TM |
2837 | .rpc_call_done = rpc_cb_add_xprt_done, |
2838 | .rpc_release = rpc_cb_add_xprt_release, | |
2839 | }; | |
2840 | ||
2841 | /** | |
2842 | * rpc_clnt_test_and_add_xprt - Test and add a new transport to a rpc_clnt | |
2843 | * @clnt: pointer to struct rpc_clnt | |
2844 | * @xps: pointer to struct rpc_xprt_switch, | |
2845 | * @xprt: pointer struct rpc_xprt | |
2846 | * @dummy: unused | |
2847 | */ | |
2848 | int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt, | |
2849 | struct rpc_xprt_switch *xps, struct rpc_xprt *xprt, | |
2850 | void *dummy) | |
2851 | { | |
2852 | struct rpc_cb_add_xprt_calldata *data; | |
7f554890 TM |
2853 | struct rpc_task *task; |
2854 | ||
dc48e0ab OK |
2855 | if (xps->xps_nunique_destaddr_xprts + 1 > clnt->cl_max_connect) { |
2856 | rcu_read_lock(); | |
2857 | pr_warn("SUNRPC: reached max allowed number (%d) did not add " | |
2858 | "transport to server: %s\n", clnt->cl_max_connect, | |
2859 | rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); | |
2860 | rcu_read_unlock(); | |
2861 | return -EINVAL; | |
2862 | } | |
2863 | ||
0adc8794 | 2864 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
7f554890 TM |
2865 | if (!data) |
2866 | return -ENOMEM; | |
2867 | data->xps = xprt_switch_get(xps); | |
2868 | data->xprt = xprt_get(xprt); | |
612b41f8 TM |
2869 | if (rpc_xprt_switch_has_addr(data->xps, (struct sockaddr *)&xprt->addr)) { |
2870 | rpc_cb_add_xprt_release(data); | |
2871 | goto success; | |
2872 | } | |
7f554890 | 2873 | |
841a2ed9 | 2874 | task = rpc_call_null_helper(clnt, xprt, NULL, RPC_TASK_ASYNC, |
7f554890 | 2875 | &rpc_cb_add_xprt_call_ops, data); |
13bd9014 DA |
2876 | if (IS_ERR(task)) |
2877 | return PTR_ERR(task); | |
2878 | ||
3a3f9766 | 2879 | data->xps->xps_nunique_destaddr_xprts++; |
7f554890 | 2880 | rpc_put_task(task); |
612b41f8 | 2881 | success: |
7f554890 TM |
2882 | return 1; |
2883 | } | |
2884 | EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt); | |
2885 | ||
7960aa9e OK |
2886 | static int rpc_clnt_add_xprt_helper(struct rpc_clnt *clnt, |
2887 | struct rpc_xprt *xprt, | |
2888 | struct rpc_add_xprt_test *data) | |
2889 | { | |
2890 | struct rpc_task *task; | |
2891 | int status = -EADDRINUSE; | |
2892 | ||
2893 | /* Test the connection */ | |
2894 | task = rpc_call_null_helper(clnt, xprt, NULL, 0, NULL, NULL); | |
2895 | if (IS_ERR(task)) | |
2896 | return PTR_ERR(task); | |
2897 | ||
2898 | status = task->tk_status; | |
2899 | rpc_put_task(task); | |
2900 | ||
2901 | if (status < 0) | |
2902 | return status; | |
2903 | ||
2904 | /* rpc_xprt_switch and rpc_xprt are deferrenced by add_xprt_test() */ | |
2905 | data->add_xprt_test(clnt, xprt, data->data); | |
2906 | ||
2907 | return 0; | |
2908 | } | |
2909 | ||
fda0ab41 AA |
2910 | /** |
2911 | * rpc_clnt_setup_test_and_add_xprt() | |
2912 | * | |
2913 | * This is an rpc_clnt_add_xprt setup() function which returns 1 so: | |
2914 | * 1) caller of the test function must dereference the rpc_xprt_switch | |
2915 | * and the rpc_xprt. | |
2916 | * 2) test function must call rpc_xprt_switch_add_xprt, usually in | |
2917 | * the rpc_call_done routine. | |
2918 | * | |
2919 | * Upon success (return of 1), the test function adds the new | |
2920 | * transport to the rpc_clnt xprt switch | |
2921 | * | |
2922 | * @clnt: struct rpc_clnt to get the new transport | |
2923 | * @xps: the rpc_xprt_switch to hold the new transport | |
2924 | * @xprt: the rpc_xprt to test | |
2925 | * @data: a struct rpc_add_xprt_test pointer that holds the test function | |
2926 | * and test function call data | |
2927 | */ | |
2928 | int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt, | |
2929 | struct rpc_xprt_switch *xps, | |
2930 | struct rpc_xprt *xprt, | |
2931 | void *data) | |
2932 | { | |
fda0ab41 AA |
2933 | int status = -EADDRINUSE; |
2934 | ||
2935 | xprt = xprt_get(xprt); | |
2936 | xprt_switch_get(xps); | |
2937 | ||
2938 | if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr)) | |
2939 | goto out_err; | |
2940 | ||
7960aa9e | 2941 | status = rpc_clnt_add_xprt_helper(clnt, xprt, data); |
fda0ab41 AA |
2942 | if (status < 0) |
2943 | goto out_err; | |
2944 | ||
7960aa9e | 2945 | status = 1; |
fda0ab41 AA |
2946 | out_err: |
2947 | xprt_put(xprt); | |
2948 | xprt_switch_put(xps); | |
7960aa9e OK |
2949 | if (status < 0) |
2950 | pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not " | |
2951 | "added\n", status, | |
2952 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2953 | /* so that rpc_clnt_add_xprt does not call rpc_xprt_switch_add_xprt */ | |
fda0ab41 AA |
2954 | return status; |
2955 | } | |
2956 | EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt); | |
2957 | ||
7f554890 TM |
2958 | /** |
2959 | * rpc_clnt_add_xprt - Add a new transport to a rpc_clnt | |
2960 | * @clnt: pointer to struct rpc_clnt | |
2961 | * @xprtargs: pointer to struct xprt_create | |
2962 | * @setup: callback to test and/or set up the connection | |
2963 | * @data: pointer to setup function data | |
2964 | * | |
2965 | * Creates a new transport using the parameters set in args and | |
2966 | * adds it to clnt. | |
2967 | * If ping is set, then test that connectivity succeeds before | |
2968 | * adding the new transport. | |
2969 | * | |
2970 | */ | |
2971 | int rpc_clnt_add_xprt(struct rpc_clnt *clnt, | |
2972 | struct xprt_create *xprtargs, | |
2973 | int (*setup)(struct rpc_clnt *, | |
2974 | struct rpc_xprt_switch *, | |
2975 | struct rpc_xprt *, | |
2976 | void *), | |
2977 | void *data) | |
2978 | { | |
2979 | struct rpc_xprt_switch *xps; | |
2980 | struct rpc_xprt *xprt; | |
7196dbb0 | 2981 | unsigned long connect_timeout; |
3851f1cd | 2982 | unsigned long reconnect_timeout; |
e6237b6f | 2983 | unsigned char resvport, reuseport; |
b8a09619 | 2984 | int ret = 0, ident; |
7f554890 TM |
2985 | |
2986 | rcu_read_lock(); | |
2987 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); | |
2988 | xprt = xprt_iter_xprt(&clnt->cl_xpi); | |
2989 | if (xps == NULL || xprt == NULL) { | |
2990 | rcu_read_unlock(); | |
b9622614 | 2991 | xprt_switch_put(xps); |
7f554890 TM |
2992 | return -EAGAIN; |
2993 | } | |
2994 | resvport = xprt->resvport; | |
e6237b6f | 2995 | reuseport = xprt->reuseport; |
7196dbb0 | 2996 | connect_timeout = xprt->connect_timeout; |
3851f1cd | 2997 | reconnect_timeout = xprt->max_reconnect_timeout; |
b8a09619 | 2998 | ident = xprt->xprt_class->ident; |
7f554890 TM |
2999 | rcu_read_unlock(); |
3000 | ||
b8a09619 OK |
3001 | if (!xprtargs->ident) |
3002 | xprtargs->ident = ident; | |
7f554890 TM |
3003 | xprt = xprt_create_transport(xprtargs); |
3004 | if (IS_ERR(xprt)) { | |
3005 | ret = PTR_ERR(xprt); | |
3006 | goto out_put_switch; | |
3007 | } | |
3008 | xprt->resvport = resvport; | |
e6237b6f | 3009 | xprt->reuseport = reuseport; |
7196dbb0 TM |
3010 | if (xprt->ops->set_connect_timeout != NULL) |
3011 | xprt->ops->set_connect_timeout(xprt, | |
3012 | connect_timeout, | |
3013 | reconnect_timeout); | |
7f554890 TM |
3014 | |
3015 | rpc_xprt_switch_set_roundrobin(xps); | |
3016 | if (setup) { | |
3017 | ret = setup(clnt, xps, xprt, data); | |
3018 | if (ret != 0) | |
3019 | goto out_put_xprt; | |
3020 | } | |
3021 | rpc_xprt_switch_add_xprt(xps, xprt); | |
3022 | out_put_xprt: | |
3023 | xprt_put(xprt); | |
3024 | out_put_switch: | |
3025 | xprt_switch_put(xps); | |
3026 | return ret; | |
3027 | } | |
3028 | EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt); | |
3029 | ||
92cc04f6 OK |
3030 | static int rpc_xprt_probe_trunked(struct rpc_clnt *clnt, |
3031 | struct rpc_xprt *xprt, | |
3032 | struct rpc_add_xprt_test *data) | |
3033 | { | |
3034 | struct rpc_xprt_switch *xps; | |
3035 | struct rpc_xprt *main_xprt; | |
3036 | int status = 0; | |
3037 | ||
3038 | xprt_get(xprt); | |
3039 | ||
3040 | rcu_read_lock(); | |
3041 | main_xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
3042 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); | |
3043 | status = rpc_cmp_addr_port((struct sockaddr *)&xprt->addr, | |
3044 | (struct sockaddr *)&main_xprt->addr); | |
3045 | rcu_read_unlock(); | |
3046 | xprt_put(main_xprt); | |
3047 | if (status || !test_bit(XPRT_OFFLINE, &xprt->state)) | |
3048 | goto out; | |
3049 | ||
3050 | status = rpc_clnt_add_xprt_helper(clnt, xprt, data); | |
3051 | out: | |
3052 | xprt_put(xprt); | |
3053 | xprt_switch_put(xps); | |
3054 | return status; | |
3055 | } | |
3056 | ||
3057 | /* rpc_clnt_probe_trunked_xprt -- probe offlined transport for session trunking | |
3058 | * @clnt rpc_clnt structure | |
3059 | * | |
3060 | * For each offlined transport found in the rpc_clnt structure call | |
3061 | * the function rpc_xprt_probe_trunked() which will determine if this | |
3062 | * transport still belongs to the trunking group. | |
3063 | */ | |
3064 | void rpc_clnt_probe_trunked_xprts(struct rpc_clnt *clnt, | |
3065 | struct rpc_add_xprt_test *data) | |
3066 | { | |
3067 | struct rpc_xprt_iter xpi; | |
3068 | int ret; | |
3069 | ||
3070 | ret = rpc_clnt_xprt_iter_offline_init(clnt, &xpi); | |
3071 | if (ret) | |
3072 | return; | |
3073 | for (;;) { | |
3074 | struct rpc_xprt *xprt = xprt_iter_get_next(&xpi); | |
3075 | ||
3076 | if (!xprt) | |
3077 | break; | |
3078 | ret = rpc_xprt_probe_trunked(clnt, xprt, data); | |
3079 | xprt_put(xprt); | |
3080 | if (ret < 0) | |
3081 | break; | |
3082 | xprt_iter_rewind(&xpi); | |
3083 | } | |
3084 | xprt_iter_destroy(&xpi); | |
3085 | } | |
3086 | EXPORT_SYMBOL_GPL(rpc_clnt_probe_trunked_xprts); | |
3087 | ||
895245cc OK |
3088 | static int rpc_xprt_offline(struct rpc_clnt *clnt, |
3089 | struct rpc_xprt *xprt, | |
3090 | void *data) | |
3091 | { | |
3092 | struct rpc_xprt *main_xprt; | |
3093 | struct rpc_xprt_switch *xps; | |
3094 | int err = 0; | |
3095 | ||
3096 | xprt_get(xprt); | |
3097 | ||
3098 | rcu_read_lock(); | |
3099 | main_xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
3100 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); | |
3101 | err = rpc_cmp_addr_port((struct sockaddr *)&xprt->addr, | |
3102 | (struct sockaddr *)&main_xprt->addr); | |
3103 | rcu_read_unlock(); | |
3104 | xprt_put(main_xprt); | |
3105 | if (err) | |
3106 | goto out; | |
3107 | ||
3108 | if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) { | |
3109 | err = -EINTR; | |
3110 | goto out; | |
3111 | } | |
3112 | xprt_set_offline_locked(xprt, xps); | |
3113 | ||
3114 | xprt_release_write(xprt, NULL); | |
3115 | out: | |
3116 | xprt_put(xprt); | |
3117 | xprt_switch_put(xps); | |
3118 | return err; | |
3119 | } | |
3120 | ||
3121 | /* rpc_clnt_manage_trunked_xprts -- offline trunked transports | |
3122 | * @clnt rpc_clnt structure | |
3123 | * | |
3124 | * For each active transport found in the rpc_clnt structure call | |
3125 | * the function rpc_xprt_offline() which will identify trunked transports | |
3126 | * and will mark them offline. | |
3127 | */ | |
3128 | void rpc_clnt_manage_trunked_xprts(struct rpc_clnt *clnt) | |
3129 | { | |
3130 | rpc_clnt_iterate_for_each_xprt(clnt, rpc_xprt_offline, NULL); | |
3131 | } | |
3132 | EXPORT_SYMBOL_GPL(rpc_clnt_manage_trunked_xprts); | |
3133 | ||
7196dbb0 TM |
3134 | struct connect_timeout_data { |
3135 | unsigned long connect_timeout; | |
3136 | unsigned long reconnect_timeout; | |
3137 | }; | |
3138 | ||
8d480326 | 3139 | static int |
7196dbb0 | 3140 | rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt, |
8d480326 TM |
3141 | struct rpc_xprt *xprt, |
3142 | void *data) | |
3143 | { | |
7196dbb0 | 3144 | struct connect_timeout_data *timeo = data; |
8d480326 | 3145 | |
7196dbb0 TM |
3146 | if (xprt->ops->set_connect_timeout) |
3147 | xprt->ops->set_connect_timeout(xprt, | |
3148 | timeo->connect_timeout, | |
3149 | timeo->reconnect_timeout); | |
8d480326 TM |
3150 | return 0; |
3151 | } | |
3152 | ||
3153 | void | |
26ae102f TM |
3154 | rpc_set_connect_timeout(struct rpc_clnt *clnt, |
3155 | unsigned long connect_timeout, | |
3156 | unsigned long reconnect_timeout) | |
8d480326 | 3157 | { |
7196dbb0 | 3158 | struct connect_timeout_data timeout = { |
26ae102f TM |
3159 | .connect_timeout = connect_timeout, |
3160 | .reconnect_timeout = reconnect_timeout, | |
7196dbb0 | 3161 | }; |
8d480326 | 3162 | rpc_clnt_iterate_for_each_xprt(clnt, |
7196dbb0 TM |
3163 | rpc_xprt_set_connect_timeout, |
3164 | &timeout); | |
8d480326 | 3165 | } |
26ae102f | 3166 | EXPORT_SYMBOL_GPL(rpc_set_connect_timeout); |
8d480326 | 3167 | |
3b58a8a9 AA |
3168 | void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt) |
3169 | { | |
bb29dd84 | 3170 | rcu_read_lock(); |
3b58a8a9 | 3171 | xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); |
bb29dd84 | 3172 | rcu_read_unlock(); |
3b58a8a9 AA |
3173 | } |
3174 | EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put); | |
3175 | ||
9368fd6c OK |
3176 | void rpc_clnt_xprt_set_online(struct rpc_clnt *clnt, struct rpc_xprt *xprt) |
3177 | { | |
3178 | struct rpc_xprt_switch *xps; | |
3179 | ||
3180 | rcu_read_lock(); | |
3181 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); | |
3182 | rcu_read_unlock(); | |
3183 | xprt_set_online_locked(xprt, xps); | |
3184 | } | |
3185 | ||
dd691717 AA |
3186 | void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) |
3187 | { | |
9368fd6c OK |
3188 | if (rpc_clnt_xprt_switch_has_addr(clnt, |
3189 | (const struct sockaddr *)&xprt->addr)) { | |
3190 | return rpc_clnt_xprt_set_online(clnt, xprt); | |
3191 | } | |
bb29dd84 | 3192 | rcu_read_lock(); |
dd691717 AA |
3193 | rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch), |
3194 | xprt); | |
bb29dd84 | 3195 | rcu_read_unlock(); |
dd691717 AA |
3196 | } |
3197 | EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt); | |
3198 | ||
497e6464 OK |
3199 | void rpc_clnt_xprt_switch_remove_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) |
3200 | { | |
3201 | struct rpc_xprt_switch *xps; | |
3202 | ||
3203 | rcu_read_lock(); | |
3204 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); | |
3205 | rpc_xprt_switch_remove_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch), | |
3206 | xprt, 0); | |
3207 | xps->xps_nunique_destaddr_xprts--; | |
3208 | rcu_read_unlock(); | |
3209 | } | |
3210 | EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_remove_xprt); | |
3211 | ||
39e5d2df AA |
3212 | bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt, |
3213 | const struct sockaddr *sap) | |
3214 | { | |
3215 | struct rpc_xprt_switch *xps; | |
3216 | bool ret; | |
3217 | ||
39e5d2df | 3218 | rcu_read_lock(); |
bb29dd84 | 3219 | xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); |
39e5d2df AA |
3220 | ret = rpc_xprt_switch_has_addr(xps, sap); |
3221 | rcu_read_unlock(); | |
3222 | return ret; | |
3223 | } | |
3224 | EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr); | |
3225 | ||
f895b252 | 3226 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
68a23ee9 CL |
3227 | static void rpc_show_header(void) |
3228 | { | |
cb3997b5 CL |
3229 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
3230 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
3231 | } |
3232 | ||
38e886e0 CL |
3233 | static void rpc_show_task(const struct rpc_clnt *clnt, |
3234 | const struct rpc_task *task) | |
3235 | { | |
3236 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
3237 | |
3238 | if (RPC_IS_QUEUED(task)) | |
3239 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
3240 | ||
b3bcedad | 3241 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 | 3242 | task->tk_pid, task->tk_flags, task->tk_status, |
5efd1876 | 3243 | clnt, task->tk_rqstp, rpc_task_timeout(task), task->tk_ops, |
55909f21 | 3244 | clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), |
b3bcedad | 3245 | task->tk_action, rpc_waitq); |
38e886e0 CL |
3246 | } |
3247 | ||
70abc49b | 3248 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
3249 | { |
3250 | struct rpc_clnt *clnt; | |
38e886e0 | 3251 | struct rpc_task *task; |
68a23ee9 | 3252 | int header = 0; |
70abc49b | 3253 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 3254 | |
70abc49b SK |
3255 | spin_lock(&sn->rpc_client_lock); |
3256 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 3257 | spin_lock(&clnt->cl_lock); |
38e886e0 | 3258 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
3259 | if (!header) { |
3260 | rpc_show_header(); | |
3261 | header++; | |
3262 | } | |
38e886e0 | 3263 | rpc_show_task(clnt, task); |
188fef11 TM |
3264 | } |
3265 | spin_unlock(&clnt->cl_lock); | |
3266 | } | |
70abc49b | 3267 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
3268 | } |
3269 | #endif | |
3c87ef6e JL |
3270 | |
3271 | #if IS_ENABLED(CONFIG_SUNRPC_SWAP) | |
15001e5a TM |
3272 | static int |
3273 | rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt, | |
3274 | struct rpc_xprt *xprt, | |
3275 | void *dummy) | |
3276 | { | |
3277 | return xprt_enable_swap(xprt); | |
3278 | } | |
3279 | ||
3c87ef6e JL |
3280 | int |
3281 | rpc_clnt_swap_activate(struct rpc_clnt *clnt) | |
3282 | { | |
4dc73c67 N |
3283 | while (clnt != clnt->cl_parent) |
3284 | clnt = clnt->cl_parent; | |
15001e5a TM |
3285 | if (atomic_inc_return(&clnt->cl_swapper) == 1) |
3286 | return rpc_clnt_iterate_for_each_xprt(clnt, | |
3287 | rpc_clnt_swap_activate_callback, NULL); | |
3288 | return 0; | |
3c87ef6e JL |
3289 | } |
3290 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate); | |
3291 | ||
15001e5a TM |
3292 | static int |
3293 | rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt, | |
3294 | struct rpc_xprt *xprt, | |
3295 | void *dummy) | |
3296 | { | |
3297 | xprt_disable_swap(xprt); | |
3298 | return 0; | |
3299 | } | |
3300 | ||
3c87ef6e JL |
3301 | void |
3302 | rpc_clnt_swap_deactivate(struct rpc_clnt *clnt) | |
3303 | { | |
15001e5a TM |
3304 | if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) |
3305 | rpc_clnt_iterate_for_each_xprt(clnt, | |
3306 | rpc_clnt_swap_deactivate_callback, NULL); | |
3c87ef6e JL |
3307 | } |
3308 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate); | |
3309 | #endif /* CONFIG_SUNRPC_SWAP */ |