Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
55aa4f58 | 2 | * linux/net/sunrpc/clnt.c |
1da177e4 LT |
3 | * |
4 | * This file contains the high-level RPC interface. | |
5 | * It is modeled as a finite state machine to support both synchronous | |
6 | * and asynchronous requests. | |
7 | * | |
8 | * - RPC header generation and argument serialization. | |
9 | * - Credential refresh. | |
10 | * - TCP connect handling. | |
11 | * - Retry of operation when it is suspected the operation failed because | |
12 | * of uid squashing on the server, or when the credentials were stale | |
13 | * and need to be refreshed, or when a packet was damaged in transit. | |
14 | * This may be have to be moved to the VFS layer. | |
15 | * | |
1da177e4 LT |
16 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
17 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> | |
18 | */ | |
19 | ||
1da177e4 LT |
20 | |
21 | #include <linux/module.h> | |
22 | #include <linux/types.h> | |
cb3997b5 | 23 | #include <linux/kallsyms.h> |
1da177e4 | 24 | #include <linux/mm.h> |
23ac6581 TM |
25 | #include <linux/namei.h> |
26 | #include <linux/mount.h> | |
1da177e4 | 27 | #include <linux/slab.h> |
40b00b6b | 28 | #include <linux/rcupdate.h> |
1da177e4 | 29 | #include <linux/utsname.h> |
11c556b3 | 30 | #include <linux/workqueue.h> |
176e21ee | 31 | #include <linux/in.h> |
510deb0d | 32 | #include <linux/in6.h> |
176e21ee | 33 | #include <linux/un.h> |
1da177e4 LT |
34 | |
35 | #include <linux/sunrpc/clnt.h> | |
5976687a | 36 | #include <linux/sunrpc/addr.h> |
1da177e4 | 37 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 38 | #include <linux/sunrpc/metrics.h> |
55ae1aab | 39 | #include <linux/sunrpc/bc_xprt.h> |
5753cba1 | 40 | #include <trace/events/sunrpc.h> |
1da177e4 | 41 | |
55ae1aab | 42 | #include "sunrpc.h" |
70abc49b | 43 | #include "netns.h" |
1da177e4 | 44 | |
f895b252 | 45 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
46 | # define RPCDBG_FACILITY RPCDBG_CALL |
47 | #endif | |
48 | ||
46121cf7 CL |
49 | #define dprint_status(t) \ |
50 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 51 | __func__, t->tk_status) |
46121cf7 | 52 | |
188fef11 TM |
53 | /* |
54 | * All RPC clients are linked into this list | |
55 | */ | |
188fef11 | 56 | |
1da177e4 LT |
57 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
58 | ||
59 | ||
60 | static void call_start(struct rpc_task *task); | |
61 | static void call_reserve(struct rpc_task *task); | |
62 | static void call_reserveresult(struct rpc_task *task); | |
63 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
64 | static void call_decode(struct rpc_task *task); |
65 | static void call_bind(struct rpc_task *task); | |
da351878 | 66 | static void call_bind_status(struct rpc_task *task); |
1da177e4 | 67 | static void call_transmit(struct rpc_task *task); |
9e00abc3 | 68 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab | 69 | static void call_bc_transmit(struct rpc_task *task); |
9e00abc3 | 70 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1da177e4 | 71 | static void call_status(struct rpc_task *task); |
940e3318 | 72 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
73 | static void call_refresh(struct rpc_task *task); |
74 | static void call_refreshresult(struct rpc_task *task); | |
75 | static void call_timeout(struct rpc_task *task); | |
76 | static void call_connect(struct rpc_task *task); | |
77 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 78 | |
b0e1c57e CL |
79 | static __be32 *rpc_encode_header(struct rpc_task *task); |
80 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
caabea8a | 81 | static int rpc_ping(struct rpc_clnt *clnt); |
64c91a1f | 82 | |
188fef11 TM |
83 | static void rpc_register_client(struct rpc_clnt *clnt) |
84 | { | |
2446ab60 TM |
85 | struct net *net = rpc_net_ns(clnt); |
86 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
87 | |
88 | spin_lock(&sn->rpc_client_lock); | |
89 | list_add(&clnt->cl_clients, &sn->all_clients); | |
90 | spin_unlock(&sn->rpc_client_lock); | |
188fef11 TM |
91 | } |
92 | ||
93 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
94 | { | |
2446ab60 TM |
95 | struct net *net = rpc_net_ns(clnt); |
96 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
97 | |
98 | spin_lock(&sn->rpc_client_lock); | |
188fef11 | 99 | list_del(&clnt->cl_clients); |
70abc49b | 100 | spin_unlock(&sn->rpc_client_lock); |
188fef11 | 101 | } |
1da177e4 | 102 | |
0157d021 SK |
103 | static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) |
104 | { | |
c36dcfe1 | 105 | rpc_remove_client_dir(clnt); |
0157d021 SK |
106 | } |
107 | ||
108 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
109 | { | |
2446ab60 | 110 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 111 | struct super_block *pipefs_sb; |
0157d021 | 112 | |
2446ab60 | 113 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 114 | if (pipefs_sb) { |
0157d021 | 115 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 116 | rpc_put_sb_net(net); |
0157d021 | 117 | } |
0157d021 SK |
118 | } |
119 | ||
120 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
41b6b4d0 | 121 | struct rpc_clnt *clnt) |
1da177e4 | 122 | { |
f134585a | 123 | static uint32_t clntid; |
41b6b4d0 | 124 | const char *dir_name = clnt->cl_program->pipe_dir_name; |
23ac6581 | 125 | char name[15]; |
0157d021 | 126 | struct dentry *dir, *dentry; |
1da177e4 | 127 | |
0157d021 | 128 | dir = rpc_d_lookup_sb(sb, dir_name); |
922eeac3 WAA |
129 | if (dir == NULL) { |
130 | pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); | |
0157d021 | 131 | return dir; |
922eeac3 | 132 | } |
f134585a | 133 | for (;;) { |
a95e691f | 134 | snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
23ac6581 | 135 | name[sizeof(name) - 1] = '\0'; |
a95e691f | 136 | dentry = rpc_create_client_dir(dir, name, clnt); |
0157d021 | 137 | if (!IS_ERR(dentry)) |
23ac6581 | 138 | break; |
a95e691f AV |
139 | if (dentry == ERR_PTR(-EEXIST)) |
140 | continue; | |
141 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" | |
142 | " %s/%s, error %ld\n", | |
143 | dir_name, name, PTR_ERR(dentry)); | |
144 | break; | |
1da177e4 | 145 | } |
0157d021 SK |
146 | dput(dir); |
147 | return dentry; | |
148 | } | |
149 | ||
150 | static int | |
41b6b4d0 | 151 | rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt) |
0157d021 | 152 | { |
30507f58 | 153 | struct dentry *dentry; |
0157d021 | 154 | |
c36dcfe1 TM |
155 | if (clnt->cl_program->pipe_dir_name != NULL) { |
156 | dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt); | |
157 | if (IS_ERR(dentry)) | |
158 | return PTR_ERR(dentry); | |
159 | } | |
23ac6581 | 160 | return 0; |
1da177e4 LT |
161 | } |
162 | ||
41b6b4d0 | 163 | static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) |
ea8cfa06 | 164 | { |
41b6b4d0 | 165 | if (clnt->cl_program->pipe_dir_name == NULL) |
4f6bb246 | 166 | return 1; |
41b6b4d0 | 167 | |
c36dcfe1 TM |
168 | switch (event) { |
169 | case RPC_PIPEFS_MOUNT: | |
170 | if (clnt->cl_pipedir_objects.pdh_dentry != NULL) | |
171 | return 1; | |
172 | if (atomic_read(&clnt->cl_count) == 0) | |
173 | return 1; | |
174 | break; | |
175 | case RPC_PIPEFS_UMOUNT: | |
176 | if (clnt->cl_pipedir_objects.pdh_dentry == NULL) | |
177 | return 1; | |
178 | break; | |
179 | } | |
ea8cfa06 SK |
180 | return 0; |
181 | } | |
182 | ||
183 | static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, | |
184 | struct super_block *sb) | |
80df9d20 SK |
185 | { |
186 | struct dentry *dentry; | |
187 | int err = 0; | |
188 | ||
189 | switch (event) { | |
190 | case RPC_PIPEFS_MOUNT: | |
41b6b4d0 | 191 | dentry = rpc_setup_pipedir_sb(sb, clnt); |
922eeac3 WAA |
192 | if (!dentry) |
193 | return -ENOENT; | |
80df9d20 SK |
194 | if (IS_ERR(dentry)) |
195 | return PTR_ERR(dentry); | |
80df9d20 SK |
196 | break; |
197 | case RPC_PIPEFS_UMOUNT: | |
198 | __rpc_clnt_remove_pipedir(clnt); | |
199 | break; | |
200 | default: | |
201 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
202 | return -ENOTSUPP; | |
203 | } | |
204 | return err; | |
205 | } | |
206 | ||
ea8cfa06 SK |
207 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
208 | struct super_block *sb) | |
209 | { | |
210 | int error = 0; | |
211 | ||
212 | for (;; clnt = clnt->cl_parent) { | |
213 | if (!rpc_clnt_skip_event(clnt, event)) | |
214 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
215 | if (error || clnt == clnt->cl_parent) | |
216 | break; | |
217 | } | |
218 | return error; | |
219 | } | |
220 | ||
da3b4622 SK |
221 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
222 | { | |
223 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
224 | struct rpc_clnt *clnt; | |
225 | ||
226 | spin_lock(&sn->rpc_client_lock); | |
227 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
ea8cfa06 | 228 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 229 | continue; |
da3b4622 SK |
230 | spin_unlock(&sn->rpc_client_lock); |
231 | return clnt; | |
232 | } | |
233 | spin_unlock(&sn->rpc_client_lock); | |
234 | return NULL; | |
235 | } | |
236 | ||
80df9d20 SK |
237 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
238 | void *ptr) | |
239 | { | |
240 | struct super_block *sb = ptr; | |
241 | struct rpc_clnt *clnt; | |
242 | int error = 0; | |
80df9d20 | 243 | |
da3b4622 | 244 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 SK |
245 | error = __rpc_pipefs_event(clnt, event, sb); |
246 | if (error) | |
247 | break; | |
248 | } | |
80df9d20 SK |
249 | return error; |
250 | } | |
251 | ||
252 | static struct notifier_block rpc_clients_block = { | |
253 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 254 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
255 | }; |
256 | ||
257 | int rpc_clients_notifier_register(void) | |
258 | { | |
259 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
260 | } | |
261 | ||
262 | void rpc_clients_notifier_unregister(void) | |
263 | { | |
264 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
265 | } | |
266 | ||
40b00b6b TM |
267 | static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt, |
268 | struct rpc_xprt *xprt, | |
269 | const struct rpc_timeout *timeout) | |
270 | { | |
271 | struct rpc_xprt *old; | |
272 | ||
273 | spin_lock(&clnt->cl_lock); | |
34751b9d TM |
274 | old = rcu_dereference_protected(clnt->cl_xprt, |
275 | lockdep_is_held(&clnt->cl_lock)); | |
40b00b6b TM |
276 | |
277 | if (!xprt_bound(xprt)) | |
278 | clnt->cl_autobind = 1; | |
279 | ||
280 | clnt->cl_timeout = timeout; | |
281 | rcu_assign_pointer(clnt->cl_xprt, xprt); | |
282 | spin_unlock(&clnt->cl_lock); | |
283 | ||
284 | return old; | |
285 | } | |
286 | ||
cbbb3449 TM |
287 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
288 | { | |
03a9a42a TM |
289 | clnt->cl_nodelen = strlcpy(clnt->cl_nodename, |
290 | nodename, sizeof(clnt->cl_nodename)); | |
cbbb3449 TM |
291 | } |
292 | ||
d746e545 CL |
293 | static int rpc_client_register(struct rpc_clnt *clnt, |
294 | rpc_authflavor_t pseudoflavor, | |
295 | const char *client_name) | |
e73f4cc0 | 296 | { |
c2190661 | 297 | struct rpc_auth_create_args auth_args = { |
d746e545 CL |
298 | .pseudoflavor = pseudoflavor, |
299 | .target_name = client_name, | |
c2190661 | 300 | }; |
e73f4cc0 SK |
301 | struct rpc_auth *auth; |
302 | struct net *net = rpc_net_ns(clnt); | |
303 | struct super_block *pipefs_sb; | |
eeee2452 | 304 | int err; |
e73f4cc0 | 305 | |
b4b9d2cc JL |
306 | err = rpc_clnt_debugfs_register(clnt); |
307 | if (err) | |
308 | return err; | |
309 | ||
e73f4cc0 SK |
310 | pipefs_sb = rpc_get_sb_net(net); |
311 | if (pipefs_sb) { | |
41b6b4d0 | 312 | err = rpc_setup_pipedir(pipefs_sb, clnt); |
e73f4cc0 SK |
313 | if (err) |
314 | goto out; | |
315 | } | |
316 | ||
eeee2452 TM |
317 | rpc_register_client(clnt); |
318 | if (pipefs_sb) | |
319 | rpc_put_sb_net(net); | |
320 | ||
c2190661 | 321 | auth = rpcauth_create(&auth_args, clnt); |
e73f4cc0 SK |
322 | if (IS_ERR(auth)) { |
323 | dprintk("RPC: Couldn't create auth handle (flavor %u)\n", | |
d746e545 | 324 | pseudoflavor); |
e73f4cc0 SK |
325 | err = PTR_ERR(auth); |
326 | goto err_auth; | |
327 | } | |
eeee2452 TM |
328 | return 0; |
329 | err_auth: | |
330 | pipefs_sb = rpc_get_sb_net(net); | |
1540c5d3 | 331 | rpc_unregister_client(clnt); |
eeee2452 | 332 | __rpc_clnt_remove_pipedir(clnt); |
e73f4cc0 SK |
333 | out: |
334 | if (pipefs_sb) | |
335 | rpc_put_sb_net(net); | |
b4b9d2cc | 336 | rpc_clnt_debugfs_unregister(clnt); |
e73f4cc0 | 337 | return err; |
e73f4cc0 SK |
338 | } |
339 | ||
2f048db4 TM |
340 | static DEFINE_IDA(rpc_clids); |
341 | ||
342 | static int rpc_alloc_clid(struct rpc_clnt *clnt) | |
343 | { | |
344 | int clid; | |
345 | ||
346 | clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL); | |
347 | if (clid < 0) | |
348 | return clid; | |
349 | clnt->cl_clid = clid; | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static void rpc_free_clid(struct rpc_clnt *clnt) | |
354 | { | |
355 | ida_simple_remove(&rpc_clids, clnt->cl_clid); | |
356 | } | |
357 | ||
280ebcf9 TM |
358 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, |
359 | struct rpc_xprt *xprt, | |
360 | struct rpc_clnt *parent) | |
1da177e4 | 361 | { |
a613fa16 TM |
362 | const struct rpc_program *program = args->program; |
363 | const struct rpc_version *version; | |
40b00b6b TM |
364 | struct rpc_clnt *clnt = NULL; |
365 | const struct rpc_timeout *timeout; | |
03a9a42a | 366 | const char *nodename = args->nodename; |
1da177e4 | 367 | int err; |
06b8d255 CL |
368 | |
369 | /* sanity check the name before trying to print it */ | |
46121cf7 | 370 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 371 | program->name, args->servername, xprt); |
1da177e4 | 372 | |
4ada539e TM |
373 | err = rpciod_up(); |
374 | if (err) | |
375 | goto out_no_rpciod; | |
698b6d08 | 376 | |
f05c124a | 377 | err = -EINVAL; |
698b6d08 TM |
378 | if (args->version >= program->nrvers) |
379 | goto out_err; | |
380 | version = program->version[args->version]; | |
381 | if (version == NULL) | |
1da177e4 LT |
382 | goto out_err; |
383 | ||
384 | err = -ENOMEM; | |
0da974f4 | 385 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
386 | if (!clnt) |
387 | goto out_err; | |
280ebcf9 | 388 | clnt->cl_parent = parent ? : clnt; |
1da177e4 | 389 | |
2f048db4 TM |
390 | err = rpc_alloc_clid(clnt); |
391 | if (err) | |
392 | goto out_no_clid; | |
1da177e4 | 393 | |
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 TM |
415 | rpc_clnt_set_transport(clnt, xprt, timeout); |
416 | ||
1da177e4 | 417 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 418 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
1da177e4 | 419 | |
006abe88 | 420 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 421 | |
03a9a42a TM |
422 | if (nodename == NULL) |
423 | nodename = utsname()->nodename; | |
1da177e4 | 424 | /* save the nodename */ |
03a9a42a | 425 | rpc_clnt_set_nodename(clnt, nodename); |
e73f4cc0 | 426 | |
d746e545 | 427 | err = rpc_client_register(clnt, args->authflavor, args->client_name); |
e73f4cc0 SK |
428 | if (err) |
429 | goto out_no_path; | |
280ebcf9 TM |
430 | if (parent) |
431 | atomic_inc(&parent->cl_count); | |
1da177e4 LT |
432 | return clnt; |
433 | ||
1da177e4 | 434 | out_no_path: |
23bf85ba TM |
435 | rpc_free_iostats(clnt->cl_metrics); |
436 | out_no_stats: | |
2f048db4 TM |
437 | rpc_free_clid(clnt); |
438 | out_no_clid: | |
1da177e4 LT |
439 | kfree(clnt); |
440 | out_err: | |
4ada539e TM |
441 | rpciod_down(); |
442 | out_no_rpciod: | |
f05c124a | 443 | xprt_put(xprt); |
1da177e4 LT |
444 | return ERR_PTR(err); |
445 | } | |
446 | ||
83ddfebd KM |
447 | struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args, |
448 | struct rpc_xprt *xprt) | |
449 | { | |
450 | struct rpc_clnt *clnt = NULL; | |
451 | ||
452 | clnt = rpc_new_client(args, xprt, NULL); | |
453 | if (IS_ERR(clnt)) | |
454 | return clnt; | |
455 | ||
456 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
457 | int err = rpc_ping(clnt); | |
458 | if (err != 0) { | |
459 | rpc_shutdown_client(clnt); | |
460 | return ERR_PTR(err); | |
461 | } | |
462 | } | |
463 | ||
464 | clnt->cl_softrtry = 1; | |
465 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
466 | clnt->cl_softrtry = 0; | |
467 | ||
468 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
469 | clnt->cl_autobind = 1; | |
2aca5b86 TM |
470 | if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT) |
471 | clnt->cl_noretranstimeo = 1; | |
83ddfebd KM |
472 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
473 | clnt->cl_discrtry = 1; | |
474 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) | |
475 | clnt->cl_chatty = 1; | |
476 | ||
477 | return clnt; | |
478 | } | |
479 | EXPORT_SYMBOL_GPL(rpc_create_xprt); | |
480 | ||
2c53040f | 481 | /** |
c2866763 CL |
482 | * rpc_create - create an RPC client and transport with one call |
483 | * @args: rpc_clnt create argument structure | |
484 | * | |
485 | * Creates and initializes an RPC transport and an RPC client. | |
486 | * | |
487 | * It can ping the server in order to determine if it is up, and to see if | |
488 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
489 | * this behavior so asynchronous tasks can also use rpc_create. | |
490 | */ | |
491 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
492 | { | |
493 | struct rpc_xprt *xprt; | |
3c341b0b | 494 | struct xprt_create xprtargs = { |
9a23e332 | 495 | .net = args->net, |
4fa016eb | 496 | .ident = args->protocol, |
d3bc9a1d | 497 | .srcaddr = args->saddress, |
96802a09 FM |
498 | .dstaddr = args->address, |
499 | .addrlen = args->addrsize, | |
4e0038b6 | 500 | .servername = args->servername, |
f300baba | 501 | .bc_xprt = args->bc_xprt, |
96802a09 | 502 | }; |
510deb0d | 503 | char servername[48]; |
c2866763 | 504 | |
b7993ceb TM |
505 | if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) |
506 | xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; | |
33d90ac0 BF |
507 | if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) |
508 | xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; | |
43780b87 CL |
509 | /* |
510 | * If the caller chooses not to specify a hostname, whip | |
511 | * up a string representation of the passed-in address. | |
512 | */ | |
4e0038b6 | 513 | if (xprtargs.servername == NULL) { |
176e21ee CL |
514 | struct sockaddr_un *sun = |
515 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
516 | struct sockaddr_in *sin = |
517 | (struct sockaddr_in *)args->address; | |
518 | struct sockaddr_in6 *sin6 = | |
519 | (struct sockaddr_in6 *)args->address; | |
520 | ||
510deb0d CL |
521 | servername[0] = '\0'; |
522 | switch (args->address->sa_family) { | |
176e21ee CL |
523 | case AF_LOCAL: |
524 | snprintf(servername, sizeof(servername), "%s", | |
525 | sun->sun_path); | |
526 | break; | |
da09eb93 | 527 | case AF_INET: |
21454aaa HH |
528 | snprintf(servername, sizeof(servername), "%pI4", |
529 | &sin->sin_addr.s_addr); | |
510deb0d | 530 | break; |
da09eb93 | 531 | case AF_INET6: |
5b095d98 | 532 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 533 | &sin6->sin6_addr); |
510deb0d | 534 | break; |
510deb0d CL |
535 | default: |
536 | /* caller wants default server name, but | |
537 | * address family isn't recognized. */ | |
538 | return ERR_PTR(-EINVAL); | |
539 | } | |
4e0038b6 | 540 | xprtargs.servername = servername; |
43780b87 CL |
541 | } |
542 | ||
510deb0d CL |
543 | xprt = xprt_create_transport(&xprtargs); |
544 | if (IS_ERR(xprt)) | |
545 | return (struct rpc_clnt *)xprt; | |
546 | ||
c2866763 CL |
547 | /* |
548 | * By default, kernel RPC client connects from a reserved port. | |
549 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
550 | * but it is always enabled for rpciod, which handles the connect | |
551 | * operation. | |
552 | */ | |
553 | xprt->resvport = 1; | |
554 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
555 | xprt->resvport = 0; | |
556 | ||
83ddfebd | 557 | return rpc_create_xprt(args, xprt); |
c2866763 | 558 | } |
b86acd50 | 559 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 560 | |
1da177e4 LT |
561 | /* |
562 | * This function clones the RPC client structure. It allows us to share the | |
563 | * same transport while varying parameters such as the authentication | |
564 | * flavour. | |
565 | */ | |
1b63a751 CL |
566 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
567 | struct rpc_clnt *clnt) | |
1da177e4 | 568 | { |
2446ab60 | 569 | struct rpc_xprt *xprt; |
1b63a751 CL |
570 | struct rpc_clnt *new; |
571 | int err; | |
1da177e4 | 572 | |
1b63a751 | 573 | err = -ENOMEM; |
2446ab60 TM |
574 | rcu_read_lock(); |
575 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
576 | rcu_read_unlock(); | |
577 | if (xprt == NULL) | |
1b63a751 CL |
578 | goto out_err; |
579 | args->servername = xprt->servername; | |
03a9a42a | 580 | args->nodename = clnt->cl_nodename; |
1b63a751 | 581 | |
280ebcf9 | 582 | new = rpc_new_client(args, xprt, clnt); |
1b63a751 CL |
583 | if (IS_ERR(new)) { |
584 | err = PTR_ERR(new); | |
a58e0be6 | 585 | goto out_err; |
1b63a751 CL |
586 | } |
587 | ||
1b63a751 CL |
588 | /* Turn off autobind on clones */ |
589 | new->cl_autobind = 0; | |
590 | new->cl_softrtry = clnt->cl_softrtry; | |
2aca5b86 | 591 | new->cl_noretranstimeo = clnt->cl_noretranstimeo; |
1b63a751 CL |
592 | new->cl_discrtry = clnt->cl_discrtry; |
593 | new->cl_chatty = clnt->cl_chatty; | |
1da177e4 | 594 | return new; |
1b63a751 | 595 | |
1b63a751 | 596 | out_err: |
0dc47877 | 597 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 598 | return ERR_PTR(err); |
1da177e4 | 599 | } |
1b63a751 CL |
600 | |
601 | /** | |
602 | * rpc_clone_client - Clone an RPC client structure | |
603 | * | |
604 | * @clnt: RPC client whose parameters are copied | |
605 | * | |
606 | * Returns a fresh RPC client or an ERR_PTR. | |
607 | */ | |
608 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
609 | { | |
610 | struct rpc_create_args args = { | |
611 | .program = clnt->cl_program, | |
612 | .prognumber = clnt->cl_prog, | |
613 | .version = clnt->cl_vers, | |
614 | .authflavor = clnt->cl_auth->au_flavor, | |
1b63a751 CL |
615 | }; |
616 | return __rpc_clone_client(&args, clnt); | |
617 | } | |
e8914c65 | 618 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 619 | |
ba9b584c CL |
620 | /** |
621 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
622 | * | |
623 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 624 | * @flavor: security flavor for new client |
ba9b584c CL |
625 | * |
626 | * Returns a fresh RPC client or an ERR_PTR. | |
627 | */ | |
628 | struct rpc_clnt * | |
629 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
630 | { | |
631 | struct rpc_create_args args = { | |
632 | .program = clnt->cl_program, | |
633 | .prognumber = clnt->cl_prog, | |
634 | .version = clnt->cl_vers, | |
635 | .authflavor = flavor, | |
ba9b584c CL |
636 | }; |
637 | return __rpc_clone_client(&args, clnt); | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
640 | ||
40b00b6b TM |
641 | /** |
642 | * rpc_switch_client_transport: switch the RPC transport on the fly | |
643 | * @clnt: pointer to a struct rpc_clnt | |
644 | * @args: pointer to the new transport arguments | |
645 | * @timeout: pointer to the new timeout parameters | |
646 | * | |
647 | * This function allows the caller to switch the RPC transport for the | |
648 | * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS | |
649 | * server, for instance. It assumes that the caller has ensured that | |
650 | * there are no active RPC tasks by using some form of locking. | |
651 | * | |
652 | * Returns zero if "clnt" is now using the new xprt. Otherwise a | |
653 | * negative errno is returned, and "clnt" continues to use the old | |
654 | * xprt. | |
655 | */ | |
656 | int rpc_switch_client_transport(struct rpc_clnt *clnt, | |
657 | struct xprt_create *args, | |
658 | const struct rpc_timeout *timeout) | |
659 | { | |
660 | const struct rpc_timeout *old_timeo; | |
661 | rpc_authflavor_t pseudoflavor; | |
662 | struct rpc_xprt *xprt, *old; | |
663 | struct rpc_clnt *parent; | |
664 | int err; | |
665 | ||
666 | xprt = xprt_create_transport(args); | |
667 | if (IS_ERR(xprt)) { | |
668 | dprintk("RPC: failed to create new xprt for clnt %p\n", | |
669 | clnt); | |
670 | return PTR_ERR(xprt); | |
671 | } | |
672 | ||
673 | pseudoflavor = clnt->cl_auth->au_flavor; | |
674 | ||
675 | old_timeo = clnt->cl_timeout; | |
676 | old = rpc_clnt_set_transport(clnt, xprt, timeout); | |
677 | ||
678 | rpc_unregister_client(clnt); | |
679 | __rpc_clnt_remove_pipedir(clnt); | |
b4b9d2cc | 680 | rpc_clnt_debugfs_unregister(clnt); |
40b00b6b TM |
681 | |
682 | /* | |
683 | * A new transport was created. "clnt" therefore | |
684 | * becomes the root of a new cl_parent tree. clnt's | |
685 | * children, if it has any, still point to the old xprt. | |
686 | */ | |
687 | parent = clnt->cl_parent; | |
688 | clnt->cl_parent = clnt; | |
689 | ||
690 | /* | |
691 | * The old rpc_auth cache cannot be re-used. GSS | |
692 | * contexts in particular are between a single | |
693 | * client and server. | |
694 | */ | |
695 | err = rpc_client_register(clnt, pseudoflavor, NULL); | |
696 | if (err) | |
697 | goto out_revert; | |
698 | ||
699 | synchronize_rcu(); | |
700 | if (parent != clnt) | |
701 | rpc_release_client(parent); | |
702 | xprt_put(old); | |
703 | dprintk("RPC: replaced xprt for clnt %p\n", clnt); | |
704 | return 0; | |
705 | ||
706 | out_revert: | |
707 | rpc_clnt_set_transport(clnt, old, old_timeo); | |
708 | clnt->cl_parent = parent; | |
709 | rpc_client_register(clnt, pseudoflavor, NULL); | |
710 | xprt_put(xprt); | |
711 | dprintk("RPC: failed to switch xprt for clnt %p\n", clnt); | |
712 | return err; | |
713 | } | |
714 | EXPORT_SYMBOL_GPL(rpc_switch_client_transport); | |
715 | ||
58f9612c TM |
716 | /* |
717 | * Kill all tasks for the given client. | |
718 | * XXX: kill their descendants as well? | |
719 | */ | |
720 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
721 | { | |
722 | struct rpc_task *rovr; | |
723 | ||
724 | ||
725 | if (list_empty(&clnt->cl_tasks)) | |
726 | return; | |
727 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
728 | /* | |
729 | * Spin lock all_tasks to prevent changes... | |
730 | */ | |
731 | spin_lock(&clnt->cl_lock); | |
732 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
733 | if (!RPC_IS_ACTIVATED(rovr)) | |
734 | continue; | |
735 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
736 | rovr->tk_flags |= RPC_TASK_KILLED; | |
737 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
738 | if (RPC_IS_QUEUED(rovr)) |
739 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
740 | rovr); | |
58f9612c TM |
741 | } |
742 | } | |
743 | spin_unlock(&clnt->cl_lock); | |
744 | } | |
745 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
746 | ||
1da177e4 LT |
747 | /* |
748 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 749 | * requests. |
1da177e4 | 750 | */ |
4c402b40 | 751 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 752 | { |
168e4b39 WAA |
753 | might_sleep(); |
754 | ||
4e0038b6 | 755 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
55909f21 | 756 | clnt->cl_program->name, |
4e0038b6 | 757 | rcu_dereference(clnt->cl_xprt)->servername); |
1da177e4 | 758 | |
34f52e35 | 759 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 760 | rpc_killall_tasks(clnt); |
532347e2 | 761 | wait_event_timeout(destroy_wait, |
34f52e35 | 762 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
763 | } |
764 | ||
4c402b40 | 765 | rpc_release_client(clnt); |
1da177e4 | 766 | } |
e8914c65 | 767 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
768 | |
769 | /* | |
34f52e35 | 770 | * Free an RPC client |
1da177e4 | 771 | */ |
d07ba842 | 772 | static struct rpc_clnt * |
006abe88 | 773 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 774 | { |
d07ba842 TM |
775 | struct rpc_clnt *parent = NULL; |
776 | ||
4e0038b6 | 777 | dprintk_rcu("RPC: destroying %s client for %s\n", |
55909f21 | 778 | clnt->cl_program->name, |
4e0038b6 | 779 | rcu_dereference(clnt->cl_xprt)->servername); |
6eac7d3f | 780 | if (clnt->cl_parent != clnt) |
d07ba842 | 781 | parent = clnt->cl_parent; |
b4b9d2cc | 782 | rpc_clnt_debugfs_unregister(clnt); |
f5131257 | 783 | rpc_clnt_remove_pipedir(clnt); |
adb6fa7f | 784 | rpc_unregister_client(clnt); |
11c556b3 CL |
785 | rpc_free_iostats(clnt->cl_metrics); |
786 | clnt->cl_metrics = NULL; | |
2446ab60 | 787 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
4ada539e | 788 | rpciod_down(); |
2f048db4 | 789 | rpc_free_clid(clnt); |
1da177e4 | 790 | kfree(clnt); |
d07ba842 | 791 | return parent; |
1da177e4 LT |
792 | } |
793 | ||
1dd17ec6 TM |
794 | /* |
795 | * Free an RPC client | |
796 | */ | |
d07ba842 | 797 | static struct rpc_clnt * |
006abe88 | 798 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 799 | { |
d07ba842 TM |
800 | if (clnt->cl_auth == NULL) |
801 | return rpc_free_client(clnt); | |
1dd17ec6 TM |
802 | |
803 | /* | |
804 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
805 | * release remaining GSS contexts. This mechanism ensures | |
806 | * that it can do so safely. | |
807 | */ | |
006abe88 | 808 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
809 | rpcauth_release(clnt->cl_auth); |
810 | clnt->cl_auth = NULL; | |
006abe88 | 811 | if (atomic_dec_and_test(&clnt->cl_count)) |
d07ba842 TM |
812 | return rpc_free_client(clnt); |
813 | return NULL; | |
1dd17ec6 TM |
814 | } |
815 | ||
1da177e4 | 816 | /* |
34f52e35 | 817 | * Release reference to the RPC client |
1da177e4 LT |
818 | */ |
819 | void | |
820 | rpc_release_client(struct rpc_clnt *clnt) | |
821 | { | |
34f52e35 | 822 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 823 | |
d07ba842 TM |
824 | do { |
825 | if (list_empty(&clnt->cl_tasks)) | |
826 | wake_up(&destroy_wait); | |
827 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
828 | break; | |
829 | clnt = rpc_free_auth(clnt); | |
830 | } while (clnt != NULL); | |
34f52e35 | 831 | } |
1d658336 | 832 | EXPORT_SYMBOL_GPL(rpc_release_client); |
34f52e35 | 833 | |
007e251f AG |
834 | /** |
835 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
836 | * @old: old rpc_client |
837 | * @program: rpc program to set | |
838 | * @vers: rpc program version | |
007e251f AG |
839 | * |
840 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
841 | * of use for enabling different RPC programs to share the same transport. | |
842 | * The Sun NFSv2/v3 ACL protocol can do this. | |
843 | */ | |
844 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 845 | const struct rpc_program *program, |
89eb21c3 | 846 | u32 vers) |
007e251f | 847 | { |
f994c43d TM |
848 | struct rpc_create_args args = { |
849 | .program = program, | |
850 | .prognumber = program->number, | |
851 | .version = vers, | |
852 | .authflavor = old->cl_auth->au_flavor, | |
f994c43d | 853 | }; |
007e251f | 854 | struct rpc_clnt *clnt; |
007e251f AG |
855 | int err; |
856 | ||
f994c43d | 857 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
858 | if (IS_ERR(clnt)) |
859 | goto out; | |
caabea8a | 860 | err = rpc_ping(clnt); |
007e251f AG |
861 | if (err != 0) { |
862 | rpc_shutdown_client(clnt); | |
863 | clnt = ERR_PTR(err); | |
864 | } | |
cca5172a | 865 | out: |
007e251f AG |
866 | return clnt; |
867 | } | |
e8914c65 | 868 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 869 | |
58f9612c TM |
870 | void rpc_task_release_client(struct rpc_task *task) |
871 | { | |
872 | struct rpc_clnt *clnt = task->tk_client; | |
873 | ||
874 | if (clnt != NULL) { | |
875 | /* Remove from client task list */ | |
876 | spin_lock(&clnt->cl_lock); | |
877 | list_del(&task->tk_task); | |
878 | spin_unlock(&clnt->cl_lock); | |
879 | task->tk_client = NULL; | |
880 | ||
881 | rpc_release_client(clnt); | |
882 | } | |
883 | } | |
884 | ||
885 | static | |
886 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
887 | { | |
888 | if (clnt != NULL) { | |
889 | rpc_task_release_client(task); | |
890 | task->tk_client = clnt; | |
006abe88 | 891 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
892 | if (clnt->cl_softrtry) |
893 | task->tk_flags |= RPC_TASK_SOFT; | |
8a19a0b6 TM |
894 | if (clnt->cl_noretranstimeo) |
895 | task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT; | |
a564b8f0 MG |
896 | if (sk_memalloc_socks()) { |
897 | struct rpc_xprt *xprt; | |
898 | ||
899 | rcu_read_lock(); | |
900 | xprt = rcu_dereference(clnt->cl_xprt); | |
901 | if (xprt->swapper) | |
902 | task->tk_flags |= RPC_TASK_SWAPPER; | |
903 | rcu_read_unlock(); | |
904 | } | |
58f9612c TM |
905 | /* Add to the client's list of all tasks */ |
906 | spin_lock(&clnt->cl_lock); | |
907 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
908 | spin_unlock(&clnt->cl_lock); | |
909 | } | |
910 | } | |
911 | ||
cbdabc7f AA |
912 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
913 | { | |
914 | rpc_task_release_client(task); | |
915 | rpc_task_set_client(task, clnt); | |
916 | } | |
917 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
918 | ||
919 | ||
58f9612c TM |
920 | static void |
921 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
922 | { | |
923 | if (msg != NULL) { | |
924 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
925 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
926 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
927 | if (msg->rpc_cred != NULL) |
928 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
929 | } |
930 | } | |
931 | ||
1da177e4 LT |
932 | /* |
933 | * Default callback for async RPC calls | |
934 | */ | |
935 | static void | |
963d8fe5 | 936 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
937 | { |
938 | } | |
939 | ||
963d8fe5 TM |
940 | static const struct rpc_call_ops rpc_default_ops = { |
941 | .rpc_call_done = rpc_default_callback, | |
942 | }; | |
943 | ||
c970aa85 TM |
944 | /** |
945 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
946 | * @task_setup_data: pointer to task initialisation data | |
947 | */ | |
948 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 949 | { |
19445b99 | 950 | struct rpc_task *task; |
6e5b70e9 | 951 | |
84115e1c | 952 | task = rpc_new_task(task_setup_data); |
19445b99 | 953 | if (IS_ERR(task)) |
50859259 | 954 | goto out; |
6e5b70e9 | 955 | |
58f9612c TM |
956 | rpc_task_set_client(task, task_setup_data->rpc_client); |
957 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
958 | ||
58f9612c TM |
959 | if (task->tk_action == NULL) |
960 | rpc_call_start(task); | |
961 | ||
6e5b70e9 TM |
962 | atomic_inc(&task->tk_count); |
963 | rpc_execute(task); | |
6e5b70e9 | 964 | out: |
19445b99 | 965 | return task; |
6e5b70e9 | 966 | } |
c970aa85 | 967 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
968 | |
969 | /** | |
970 | * rpc_call_sync - Perform a synchronous RPC call | |
971 | * @clnt: pointer to RPC client | |
972 | * @msg: RPC call parameters | |
973 | * @flags: RPC call flags | |
1da177e4 | 974 | */ |
cbc20059 | 975 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
976 | { |
977 | struct rpc_task *task; | |
84115e1c TM |
978 | struct rpc_task_setup task_setup_data = { |
979 | .rpc_client = clnt, | |
980 | .rpc_message = msg, | |
981 | .callback_ops = &rpc_default_ops, | |
982 | .flags = flags, | |
983 | }; | |
6e5b70e9 | 984 | int status; |
1da177e4 | 985 | |
50d2bdb1 WAA |
986 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
987 | if (flags & RPC_TASK_ASYNC) { | |
988 | rpc_release_calldata(task_setup_data.callback_ops, | |
989 | task_setup_data.callback_data); | |
990 | return -EINVAL; | |
991 | } | |
1da177e4 | 992 | |
c970aa85 | 993 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
994 | if (IS_ERR(task)) |
995 | return PTR_ERR(task); | |
e60859ac | 996 | status = task->tk_status; |
bde8f00c | 997 | rpc_put_task(task); |
1da177e4 LT |
998 | return status; |
999 | } | |
e8914c65 | 1000 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 1001 | |
6e5b70e9 TM |
1002 | /** |
1003 | * rpc_call_async - Perform an asynchronous RPC call | |
1004 | * @clnt: pointer to RPC client | |
1005 | * @msg: RPC call parameters | |
1006 | * @flags: RPC call flags | |
65b6e42c | 1007 | * @tk_ops: RPC call ops |
6e5b70e9 | 1008 | * @data: user call data |
1da177e4 LT |
1009 | */ |
1010 | int | |
cbc20059 | 1011 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 1012 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
1013 | { |
1014 | struct rpc_task *task; | |
84115e1c TM |
1015 | struct rpc_task_setup task_setup_data = { |
1016 | .rpc_client = clnt, | |
1017 | .rpc_message = msg, | |
1018 | .callback_ops = tk_ops, | |
1019 | .callback_data = data, | |
1020 | .flags = flags|RPC_TASK_ASYNC, | |
1021 | }; | |
1da177e4 | 1022 | |
c970aa85 | 1023 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1024 | if (IS_ERR(task)) |
1025 | return PTR_ERR(task); | |
1026 | rpc_put_task(task); | |
1027 | return 0; | |
1da177e4 | 1028 | } |
e8914c65 | 1029 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 1030 | |
9e00abc3 | 1031 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1032 | /** |
1033 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
1034 | * rpc_execute against it | |
7a73fdde JSR |
1035 | * @req: RPC request |
1036 | * @tk_ops: RPC call ops | |
55ae1aab RL |
1037 | */ |
1038 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 1039 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
1040 | { |
1041 | struct rpc_task *task; | |
1042 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
1043 | struct rpc_task_setup task_setup_data = { | |
1044 | .callback_ops = tk_ops, | |
1045 | }; | |
1046 | ||
1047 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
1048 | /* | |
1049 | * Create an rpc_task to send the data | |
1050 | */ | |
1051 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 1052 | if (IS_ERR(task)) { |
55ae1aab RL |
1053 | xprt_free_bc_request(req); |
1054 | goto out; | |
1055 | } | |
1056 | task->tk_rqstp = req; | |
1057 | ||
1058 | /* | |
1059 | * Set up the xdr_buf length. | |
1060 | * This also indicates that the buffer is XDR encoded already. | |
1061 | */ | |
1062 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
1063 | xbufp->tail[0].iov_len; | |
1064 | ||
1065 | task->tk_action = call_bc_transmit; | |
1066 | atomic_inc(&task->tk_count); | |
9a6478f6 | 1067 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
1068 | rpc_execute(task); |
1069 | ||
1070 | out: | |
1071 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
1072 | return task; | |
1073 | } | |
9e00abc3 | 1074 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1075 | |
77de2c59 TM |
1076 | void |
1077 | rpc_call_start(struct rpc_task *task) | |
1078 | { | |
1079 | task->tk_action = call_start; | |
1080 | } | |
1081 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
1082 | ||
ed39440a CL |
1083 | /** |
1084 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
1085 | * @clnt: RPC client structure | |
1086 | * @buf: target buffer | |
65b6e42c | 1087 | * @bufsize: length of target buffer |
ed39440a CL |
1088 | * |
1089 | * Returns the number of bytes that are actually in the stored address. | |
1090 | */ | |
1091 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
1092 | { | |
1093 | size_t bytes; | |
2446ab60 TM |
1094 | struct rpc_xprt *xprt; |
1095 | ||
1096 | rcu_read_lock(); | |
1097 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 1098 | |
2446ab60 | 1099 | bytes = xprt->addrlen; |
ed39440a CL |
1100 | if (bytes > bufsize) |
1101 | bytes = bufsize; | |
2446ab60 TM |
1102 | memcpy(buf, &xprt->addr, bytes); |
1103 | rcu_read_unlock(); | |
1104 | ||
1105 | return bytes; | |
ed39440a | 1106 | } |
b86acd50 | 1107 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 1108 | |
f425eba4 CL |
1109 | /** |
1110 | * rpc_peeraddr2str - return remote peer address in printable format | |
1111 | * @clnt: RPC client structure | |
1112 | * @format: address format | |
1113 | * | |
2446ab60 TM |
1114 | * NB: the lifetime of the memory referenced by the returned pointer is |
1115 | * the same as the rpc_xprt itself. As long as the caller uses this | |
1116 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 1117 | */ |
b454ae90 CL |
1118 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
1119 | enum rpc_display_format_t format) | |
f425eba4 | 1120 | { |
2446ab60 TM |
1121 | struct rpc_xprt *xprt; |
1122 | ||
1123 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
1124 | |
1125 | if (xprt->address_strings[format] != NULL) | |
1126 | return xprt->address_strings[format]; | |
1127 | else | |
1128 | return "unprintable"; | |
f425eba4 | 1129 | } |
b86acd50 | 1130 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 1131 | |
2e738fdc CL |
1132 | static const struct sockaddr_in rpc_inaddr_loopback = { |
1133 | .sin_family = AF_INET, | |
1134 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1135 | }; | |
1136 | ||
1137 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
1138 | .sin6_family = AF_INET6, | |
1139 | .sin6_addr = IN6ADDR_ANY_INIT, | |
1140 | }; | |
1141 | ||
1142 | /* | |
1143 | * Try a getsockname() on a connected datagram socket. Using a | |
1144 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
1145 | * This conserves the ephemeral port number space. | |
1146 | * | |
1147 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1148 | * negative errno is returned. | |
1149 | */ | |
1150 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
1151 | struct sockaddr *buf, int buflen) | |
1152 | { | |
1153 | struct socket *sock; | |
1154 | int err; | |
1155 | ||
1156 | err = __sock_create(net, sap->sa_family, | |
1157 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1158 | if (err < 0) { | |
1159 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1160 | goto out; | |
1161 | } | |
1162 | ||
1163 | switch (sap->sa_family) { | |
1164 | case AF_INET: | |
1165 | err = kernel_bind(sock, | |
1166 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1167 | sizeof(rpc_inaddr_loopback)); | |
1168 | break; | |
1169 | case AF_INET6: | |
1170 | err = kernel_bind(sock, | |
1171 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1172 | sizeof(rpc_in6addr_loopback)); | |
1173 | break; | |
1174 | default: | |
1175 | err = -EAFNOSUPPORT; | |
1176 | goto out; | |
1177 | } | |
1178 | if (err < 0) { | |
1179 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1180 | goto out_release; | |
1181 | } | |
1182 | ||
1183 | err = kernel_connect(sock, sap, salen, 0); | |
1184 | if (err < 0) { | |
1185 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1186 | goto out_release; | |
1187 | } | |
1188 | ||
1189 | err = kernel_getsockname(sock, buf, &buflen); | |
1190 | if (err < 0) { | |
1191 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1192 | goto out_release; | |
1193 | } | |
1194 | ||
1195 | err = 0; | |
1196 | if (buf->sa_family == AF_INET6) { | |
1197 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1198 | sin6->sin6_scope_id = 0; | |
1199 | } | |
1200 | dprintk("RPC: %s succeeded\n", __func__); | |
1201 | ||
1202 | out_release: | |
1203 | sock_release(sock); | |
1204 | out: | |
1205 | return err; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * Scraping a connected socket failed, so we don't have a useable | |
1210 | * local address. Fallback: generate an address that will prevent | |
1211 | * the server from calling us back. | |
1212 | * | |
1213 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1214 | * negative errno is returned. | |
1215 | */ | |
1216 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1217 | { | |
1218 | switch (family) { | |
1219 | case AF_INET: | |
1220 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1221 | return -EINVAL; | |
1222 | memcpy(buf, &rpc_inaddr_loopback, | |
1223 | sizeof(rpc_inaddr_loopback)); | |
1224 | break; | |
1225 | case AF_INET6: | |
1226 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1227 | return -EINVAL; | |
1228 | memcpy(buf, &rpc_in6addr_loopback, | |
1229 | sizeof(rpc_in6addr_loopback)); | |
1230 | default: | |
1231 | dprintk("RPC: %s: address family not supported\n", | |
1232 | __func__); | |
1233 | return -EAFNOSUPPORT; | |
1234 | } | |
1235 | dprintk("RPC: %s: succeeded\n", __func__); | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | /** | |
1240 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1241 | * @clnt: RPC client structure | |
1242 | * @buf: target buffer | |
1243 | * @buflen: size of target buffer, in bytes | |
1244 | * | |
1245 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1246 | * otherwise, a negative errno is returned. | |
1247 | * | |
1248 | * This works even if the underlying transport is not currently connected, | |
1249 | * or if the upper layer never previously provided a source address. | |
1250 | * | |
1251 | * The result of this function call is transient: multiple calls in | |
1252 | * succession may give different results, depending on how local | |
1253 | * networking configuration changes over time. | |
1254 | */ | |
1255 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1256 | { | |
1257 | struct sockaddr_storage address; | |
1258 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1259 | struct rpc_xprt *xprt; | |
1260 | struct net *net; | |
1261 | size_t salen; | |
1262 | int err; | |
1263 | ||
1264 | rcu_read_lock(); | |
1265 | xprt = rcu_dereference(clnt->cl_xprt); | |
1266 | salen = xprt->addrlen; | |
1267 | memcpy(sap, &xprt->addr, salen); | |
1268 | net = get_net(xprt->xprt_net); | |
1269 | rcu_read_unlock(); | |
1270 | ||
1271 | rpc_set_port(sap, 0); | |
1272 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1273 | put_net(net); | |
1274 | if (err != 0) | |
1275 | /* Couldn't discover local address, return ANYADDR */ | |
1276 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1277 | return 0; | |
1278 | } | |
1279 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1280 | ||
1da177e4 LT |
1281 | void |
1282 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1283 | { | |
2446ab60 TM |
1284 | struct rpc_xprt *xprt; |
1285 | ||
1286 | rcu_read_lock(); | |
1287 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1288 | if (xprt->ops->set_buffer_size) |
1289 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1290 | rcu_read_unlock(); |
1da177e4 | 1291 | } |
e8914c65 | 1292 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1293 | |
2446ab60 TM |
1294 | /** |
1295 | * rpc_protocol - Get transport protocol number for an RPC client | |
1296 | * @clnt: RPC client to query | |
1297 | * | |
1298 | */ | |
1299 | int rpc_protocol(struct rpc_clnt *clnt) | |
1300 | { | |
1301 | int protocol; | |
1302 | ||
1303 | rcu_read_lock(); | |
1304 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1305 | rcu_read_unlock(); | |
1306 | return protocol; | |
1307 | } | |
1308 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1309 | ||
1310 | /** | |
1311 | * rpc_net_ns - Get the network namespace for this RPC client | |
1312 | * @clnt: RPC client to query | |
1313 | * | |
1314 | */ | |
1315 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1316 | { | |
1317 | struct net *ret; | |
1318 | ||
1319 | rcu_read_lock(); | |
1320 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1321 | rcu_read_unlock(); | |
1322 | return ret; | |
1323 | } | |
1324 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1325 | ||
1326 | /** | |
1327 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1328 | * @clnt: RPC client to query | |
1da177e4 LT |
1329 | * |
1330 | * For stream transports, this is one RPC record fragment (see RFC | |
1331 | * 1831), as we don't support multi-record requests yet. For datagram | |
1332 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1333 | * RPC header sizes. | |
1334 | */ | |
1335 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1336 | { | |
2446ab60 TM |
1337 | size_t ret; |
1338 | ||
1339 | rcu_read_lock(); | |
1340 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1341 | rcu_read_unlock(); | |
1342 | return ret; | |
1da177e4 | 1343 | } |
b86acd50 | 1344 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1345 | |
edddbb1e | 1346 | /** |
512e4b29 | 1347 | * rpc_get_timeout - Get timeout for transport in units of HZ |
edddbb1e WAA |
1348 | * @clnt: RPC client to query |
1349 | */ | |
1350 | unsigned long rpc_get_timeout(struct rpc_clnt *clnt) | |
1351 | { | |
1352 | unsigned long ret; | |
1353 | ||
1354 | rcu_read_lock(); | |
1355 | ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval; | |
1356 | rcu_read_unlock(); | |
1357 | return ret; | |
1358 | } | |
1359 | EXPORT_SYMBOL_GPL(rpc_get_timeout); | |
1360 | ||
35f5a422 CL |
1361 | /** |
1362 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1363 | * @clnt: client to rebind | |
1364 | * | |
1365 | */ | |
1366 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1367 | { | |
2446ab60 TM |
1368 | if (clnt->cl_autobind) { |
1369 | rcu_read_lock(); | |
1370 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1371 | rcu_read_unlock(); | |
1372 | } | |
35f5a422 | 1373 | } |
b86acd50 | 1374 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1375 | |
aae2006e AA |
1376 | /* |
1377 | * Restart an (async) RPC call from the call_prepare state. | |
1378 | * Usually called from within the exit handler. | |
1379 | */ | |
f1f88fc7 | 1380 | int |
aae2006e AA |
1381 | rpc_restart_call_prepare(struct rpc_task *task) |
1382 | { | |
1383 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1384 | return 0; |
d00c5d43 | 1385 | task->tk_action = call_start; |
494314c4 | 1386 | task->tk_status = 0; |
d00c5d43 TM |
1387 | if (task->tk_ops->rpc_call_prepare != NULL) |
1388 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1389 | return 1; |
aae2006e AA |
1390 | } |
1391 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1392 | ||
1da177e4 LT |
1393 | /* |
1394 | * Restart an (async) RPC call. Usually called from within the | |
1395 | * exit handler. | |
1396 | */ | |
f1f88fc7 | 1397 | int |
1da177e4 LT |
1398 | rpc_restart_call(struct rpc_task *task) |
1399 | { | |
1400 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1401 | return 0; |
1da177e4 | 1402 | task->tk_action = call_start; |
494314c4 | 1403 | task->tk_status = 0; |
f1f88fc7 | 1404 | return 1; |
1da177e4 | 1405 | } |
e8914c65 | 1406 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1407 | |
f895b252 | 1408 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b4b9d2cc JL |
1409 | const char |
1410 | *rpc_proc_name(const struct rpc_task *task) | |
3748f1e4 CL |
1411 | { |
1412 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1413 | ||
1414 | if (proc) { | |
1415 | if (proc->p_name) | |
1416 | return proc->p_name; | |
1417 | else | |
1418 | return "NULL"; | |
1419 | } else | |
1420 | return "no proc"; | |
1421 | } | |
1422 | #endif | |
1423 | ||
1da177e4 LT |
1424 | /* |
1425 | * 0. Initial state | |
1426 | * | |
1427 | * Other FSM states can be visited zero or more times, but | |
1428 | * this state is visited exactly once for each RPC. | |
1429 | */ | |
1430 | static void | |
1431 | call_start(struct rpc_task *task) | |
1432 | { | |
1433 | struct rpc_clnt *clnt = task->tk_client; | |
1434 | ||
3748f1e4 | 1435 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
55909f21 | 1436 | clnt->cl_program->name, clnt->cl_vers, |
3748f1e4 | 1437 | rpc_proc_name(task), |
46121cf7 | 1438 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1439 | |
1440 | /* Increment call count */ | |
1441 | task->tk_msg.rpc_proc->p_count++; | |
1442 | clnt->cl_stats->rpccnt++; | |
1443 | task->tk_action = call_reserve; | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * 1. Reserve an RPC call slot | |
1448 | */ | |
1449 | static void | |
1450 | call_reserve(struct rpc_task *task) | |
1451 | { | |
46121cf7 | 1452 | dprint_status(task); |
1da177e4 | 1453 | |
1da177e4 LT |
1454 | task->tk_status = 0; |
1455 | task->tk_action = call_reserveresult; | |
1456 | xprt_reserve(task); | |
1457 | } | |
1458 | ||
ba60eb25 TM |
1459 | static void call_retry_reserve(struct rpc_task *task); |
1460 | ||
1da177e4 LT |
1461 | /* |
1462 | * 1b. Grok the result of xprt_reserve() | |
1463 | */ | |
1464 | static void | |
1465 | call_reserveresult(struct rpc_task *task) | |
1466 | { | |
1467 | int status = task->tk_status; | |
1468 | ||
46121cf7 | 1469 | dprint_status(task); |
1da177e4 LT |
1470 | |
1471 | /* | |
1472 | * After a call to xprt_reserve(), we must have either | |
1473 | * a request slot or else an error status. | |
1474 | */ | |
1475 | task->tk_status = 0; | |
1476 | if (status >= 0) { | |
1477 | if (task->tk_rqstp) { | |
f2d47d02 | 1478 | task->tk_action = call_refresh; |
1da177e4 LT |
1479 | return; |
1480 | } | |
1481 | ||
1482 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1483 | __func__, status); |
1da177e4 LT |
1484 | rpc_exit(task, -EIO); |
1485 | return; | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Even though there was an error, we may have acquired | |
1490 | * a request slot somehow. Make sure not to leak it. | |
1491 | */ | |
1492 | if (task->tk_rqstp) { | |
1493 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1494 | __func__, status); |
1da177e4 LT |
1495 | xprt_release(task); |
1496 | } | |
1497 | ||
1498 | switch (status) { | |
1afeaf5c TM |
1499 | case -ENOMEM: |
1500 | rpc_delay(task, HZ >> 2); | |
1da177e4 | 1501 | case -EAGAIN: /* woken up; retry */ |
ba60eb25 | 1502 | task->tk_action = call_retry_reserve; |
1da177e4 LT |
1503 | return; |
1504 | case -EIO: /* probably a shutdown */ | |
1505 | break; | |
1506 | default: | |
1507 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1508 | __func__, status); |
1da177e4 LT |
1509 | break; |
1510 | } | |
1511 | rpc_exit(task, status); | |
1512 | } | |
1513 | ||
ba60eb25 TM |
1514 | /* |
1515 | * 1c. Retry reserving an RPC call slot | |
1516 | */ | |
1517 | static void | |
1518 | call_retry_reserve(struct rpc_task *task) | |
1519 | { | |
1520 | dprint_status(task); | |
1521 | ||
1522 | task->tk_status = 0; | |
1523 | task->tk_action = call_reserveresult; | |
1524 | xprt_retry_reserve(task); | |
1525 | } | |
1526 | ||
1da177e4 | 1527 | /* |
55576244 BF |
1528 | * 2. Bind and/or refresh the credentials |
1529 | */ | |
1530 | static void | |
1531 | call_refresh(struct rpc_task *task) | |
1532 | { | |
1533 | dprint_status(task); | |
1534 | ||
1535 | task->tk_action = call_refreshresult; | |
1536 | task->tk_status = 0; | |
1537 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1538 | rpcauth_refreshcred(task); | |
1539 | } | |
1540 | ||
1541 | /* | |
1542 | * 2a. Process the results of a credential refresh | |
1543 | */ | |
1544 | static void | |
1545 | call_refreshresult(struct rpc_task *task) | |
1546 | { | |
1547 | int status = task->tk_status; | |
1548 | ||
1549 | dprint_status(task); | |
1550 | ||
1551 | task->tk_status = 0; | |
5fc43978 | 1552 | task->tk_action = call_refresh; |
55576244 | 1553 | switch (status) { |
5fc43978 | 1554 | case 0: |
6ff33b7d | 1555 | if (rpcauth_uptodatecred(task)) { |
5fc43978 | 1556 | task->tk_action = call_allocate; |
6ff33b7d WAA |
1557 | return; |
1558 | } | |
1559 | /* Use rate-limiting and a max number of retries if refresh | |
1560 | * had status 0 but failed to update the cred. | |
1561 | */ | |
55576244 BF |
1562 | case -ETIMEDOUT: |
1563 | rpc_delay(task, 3*HZ); | |
5fc43978 TM |
1564 | case -EAGAIN: |
1565 | status = -EACCES; | |
f1ff0c27 | 1566 | case -EKEYEXPIRED: |
5fc43978 TM |
1567 | if (!task->tk_cred_retry) |
1568 | break; | |
1569 | task->tk_cred_retry--; | |
1570 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1571 | task->tk_pid, __func__); | |
1572 | return; | |
55576244 | 1573 | } |
5fc43978 TM |
1574 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1575 | task->tk_pid, __func__, status); | |
1576 | rpc_exit(task, status); | |
55576244 BF |
1577 | } |
1578 | ||
1579 | /* | |
1580 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1581 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1582 | */ |
1583 | static void | |
1584 | call_allocate(struct rpc_task *task) | |
1585 | { | |
f2d47d02 | 1586 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 | 1587 | struct rpc_rqst *req = task->tk_rqstp; |
a4f0835c | 1588 | struct rpc_xprt *xprt = req->rq_xprt; |
2bea90d4 | 1589 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1590 | |
46121cf7 CL |
1591 | dprint_status(task); |
1592 | ||
2bea90d4 | 1593 | task->tk_status = 0; |
f2d47d02 | 1594 | task->tk_action = call_bind; |
2bea90d4 | 1595 | |
02107148 | 1596 | if (req->rq_buffer) |
1da177e4 LT |
1597 | return; |
1598 | ||
2bea90d4 CL |
1599 | if (proc->p_proc != 0) { |
1600 | BUG_ON(proc->p_arglen == 0); | |
1601 | if (proc->p_decode != NULL) | |
1602 | BUG_ON(proc->p_replen == 0); | |
1603 | } | |
1da177e4 | 1604 | |
2bea90d4 CL |
1605 | /* |
1606 | * Calculate the size (in quads) of the RPC call | |
1607 | * and reply headers, and convert both values | |
1608 | * to byte sizes. | |
1609 | */ | |
1610 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1611 | req->rq_callsize <<= 2; | |
1612 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1613 | req->rq_rcvsize <<= 2; | |
1614 | ||
c5a4dd8b CL |
1615 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1616 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1617 | if (req->rq_buffer != NULL) |
1da177e4 | 1618 | return; |
46121cf7 CL |
1619 | |
1620 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1621 | |
5afa9133 | 1622 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1623 | task->tk_action = call_allocate; |
1da177e4 LT |
1624 | rpc_delay(task, HZ>>4); |
1625 | return; | |
1626 | } | |
1627 | ||
1628 | rpc_exit(task, -ERESTARTSYS); | |
1629 | } | |
1630 | ||
940e3318 TM |
1631 | static inline int |
1632 | rpc_task_need_encode(struct rpc_task *task) | |
1633 | { | |
1634 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1635 | } | |
1636 | ||
1637 | static inline void | |
1638 | rpc_task_force_reencode(struct rpc_task *task) | |
1639 | { | |
1640 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1641 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1642 | } |
1643 | ||
2bea90d4 CL |
1644 | static inline void |
1645 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1646 | { | |
1647 | buf->head[0].iov_base = start; | |
1648 | buf->head[0].iov_len = len; | |
1649 | buf->tail[0].iov_len = 0; | |
1650 | buf->page_len = 0; | |
4f22ccc3 | 1651 | buf->flags = 0; |
2bea90d4 CL |
1652 | buf->len = 0; |
1653 | buf->buflen = len; | |
1654 | } | |
1655 | ||
1da177e4 LT |
1656 | /* |
1657 | * 3. Encode arguments of an RPC call | |
1658 | */ | |
1659 | static void | |
b0e1c57e | 1660 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1661 | { |
1da177e4 | 1662 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1663 | kxdreproc_t encode; |
d8ed029d | 1664 | __be32 *p; |
1da177e4 | 1665 | |
46121cf7 | 1666 | dprint_status(task); |
1da177e4 | 1667 | |
2bea90d4 CL |
1668 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1669 | req->rq_buffer, | |
1670 | req->rq_callsize); | |
1671 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1672 | (char *)req->rq_buffer + req->rq_callsize, | |
1673 | req->rq_rcvsize); | |
1da177e4 | 1674 | |
b0e1c57e CL |
1675 | p = rpc_encode_header(task); |
1676 | if (p == NULL) { | |
1677 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1678 | rpc_exit(task, -EIO); |
1679 | return; | |
1680 | } | |
b0e1c57e CL |
1681 | |
1682 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1683 | if (encode == NULL) |
1684 | return; | |
1685 | ||
1686 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1687 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1688 | } |
1689 | ||
1690 | /* | |
1691 | * 4. Get the server port number if not yet set | |
1692 | */ | |
1693 | static void | |
1694 | call_bind(struct rpc_task *task) | |
1695 | { | |
ad2368d6 | 1696 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1697 | |
46121cf7 | 1698 | dprint_status(task); |
1da177e4 | 1699 | |
da351878 | 1700 | task->tk_action = call_connect; |
ec739ef0 | 1701 | if (!xprt_bound(xprt)) { |
da351878 | 1702 | task->tk_action = call_bind_status; |
ec739ef0 | 1703 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1704 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1705 | } |
1706 | } | |
1707 | ||
1708 | /* | |
da351878 CL |
1709 | * 4a. Sort out bind result |
1710 | */ | |
1711 | static void | |
1712 | call_bind_status(struct rpc_task *task) | |
1713 | { | |
906462af | 1714 | int status = -EIO; |
da351878 CL |
1715 | |
1716 | if (task->tk_status >= 0) { | |
46121cf7 | 1717 | dprint_status(task); |
da351878 CL |
1718 | task->tk_status = 0; |
1719 | task->tk_action = call_connect; | |
1720 | return; | |
1721 | } | |
1722 | ||
5753cba1 | 1723 | trace_rpc_bind_status(task); |
da351878 | 1724 | switch (task->tk_status) { |
381ba74a TM |
1725 | case -ENOMEM: |
1726 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1727 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1728 | goto retry_timeout; |
da351878 | 1729 | case -EACCES: |
46121cf7 CL |
1730 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1731 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1732 | /* fail immediately if this is an RPC ping */ |
1733 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1734 | status = -EOPNOTSUPP; | |
1735 | break; | |
1736 | } | |
0b760113 TM |
1737 | if (task->tk_rebind_retry == 0) |
1738 | break; | |
1739 | task->tk_rebind_retry--; | |
ea635a51 | 1740 | rpc_delay(task, 3*HZ); |
da45828e | 1741 | goto retry_timeout; |
da351878 | 1742 | case -ETIMEDOUT: |
46121cf7 | 1743 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1744 | task->tk_pid); |
da45828e | 1745 | goto retry_timeout; |
da351878 | 1746 | case -EPFNOSUPPORT: |
906462af | 1747 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1748 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1749 | task->tk_pid); |
1750 | break; | |
1751 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1752 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1753 | task->tk_pid); |
fdb63dcd | 1754 | goto retry_timeout; |
012da158 CL |
1755 | case -ECONNREFUSED: /* connection problems */ |
1756 | case -ECONNRESET: | |
df277270 | 1757 | case -ECONNABORTED: |
012da158 CL |
1758 | case -ENOTCONN: |
1759 | case -EHOSTDOWN: | |
1760 | case -EHOSTUNREACH: | |
1761 | case -ENETUNREACH: | |
3601c4a9 | 1762 | case -ENOBUFS: |
012da158 CL |
1763 | case -EPIPE: |
1764 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1765 | task->tk_pid, task->tk_status); | |
1766 | if (!RPC_IS_SOFTCONN(task)) { | |
1767 | rpc_delay(task, 5*HZ); | |
1768 | goto retry_timeout; | |
1769 | } | |
1770 | status = task->tk_status; | |
1771 | break; | |
da351878 | 1772 | default: |
46121cf7 | 1773 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1774 | task->tk_pid, -task->tk_status); |
da351878 CL |
1775 | } |
1776 | ||
1777 | rpc_exit(task, status); | |
1778 | return; | |
1779 | ||
da45828e | 1780 | retry_timeout: |
fdb63dcd | 1781 | task->tk_status = 0; |
da45828e | 1782 | task->tk_action = call_timeout; |
da351878 CL |
1783 | } |
1784 | ||
1785 | /* | |
1786 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1787 | */ |
1788 | static void | |
1789 | call_connect(struct rpc_task *task) | |
1790 | { | |
ad2368d6 | 1791 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1792 | |
46121cf7 | 1793 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1794 | task->tk_pid, xprt, |
1795 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1796 | |
da351878 CL |
1797 | task->tk_action = call_transmit; |
1798 | if (!xprt_connected(xprt)) { | |
1799 | task->tk_action = call_connect_status; | |
1800 | if (task->tk_status < 0) | |
1801 | return; | |
786615bc TM |
1802 | if (task->tk_flags & RPC_TASK_NOCONNECT) { |
1803 | rpc_exit(task, -ENOTCONN); | |
1804 | return; | |
1805 | } | |
da351878 | 1806 | xprt_connect(task); |
1da177e4 | 1807 | } |
1da177e4 LT |
1808 | } |
1809 | ||
1810 | /* | |
da351878 | 1811 | * 4c. Sort out connect result |
1da177e4 LT |
1812 | */ |
1813 | static void | |
1814 | call_connect_status(struct rpc_task *task) | |
1815 | { | |
1816 | struct rpc_clnt *clnt = task->tk_client; | |
1817 | int status = task->tk_status; | |
1818 | ||
46121cf7 | 1819 | dprint_status(task); |
da351878 | 1820 | |
5753cba1 | 1821 | trace_rpc_connect_status(task, status); |
561ec160 | 1822 | task->tk_status = 0; |
1da177e4 | 1823 | switch (status) { |
3ed5e2a2 TM |
1824 | case -ECONNREFUSED: |
1825 | case -ECONNRESET: | |
df277270 | 1826 | case -ECONNABORTED: |
3ed5e2a2 | 1827 | case -ENETUNREACH: |
df277270 | 1828 | case -EHOSTUNREACH: |
3913c78c | 1829 | case -EADDRINUSE: |
3601c4a9 | 1830 | case -ENOBUFS: |
2fc193cf | 1831 | case -EPIPE: |
3ed5e2a2 TM |
1832 | if (RPC_IS_SOFTCONN(task)) |
1833 | break; | |
1fa3e2eb SD |
1834 | /* retry with existing socket, after a delay */ |
1835 | rpc_delay(task, 3*HZ); | |
3ed5e2a2 | 1836 | case -EAGAIN: |
485f2251 TM |
1837 | /* Check for timeouts before looping back to call_bind */ |
1838 | case -ETIMEDOUT: | |
1839 | task->tk_action = call_timeout; | |
561ec160 TM |
1840 | return; |
1841 | case 0: | |
3ed5e2a2 TM |
1842 | clnt->cl_stats->netreconn++; |
1843 | task->tk_action = call_transmit; | |
1844 | return; | |
1da177e4 | 1845 | } |
3ed5e2a2 | 1846 | rpc_exit(task, status); |
1da177e4 LT |
1847 | } |
1848 | ||
1849 | /* | |
1850 | * 5. Transmit the RPC request, and wait for reply | |
1851 | */ | |
1852 | static void | |
1853 | call_transmit(struct rpc_task *task) | |
1854 | { | |
ca7f33aa TM |
1855 | int is_retrans = RPC_WAS_SENT(task); |
1856 | ||
46121cf7 | 1857 | dprint_status(task); |
1da177e4 LT |
1858 | |
1859 | task->tk_action = call_status; | |
1860 | if (task->tk_status < 0) | |
1861 | return; | |
90051ea7 | 1862 | if (!xprt_prepare_transmit(task)) |
1da177e4 | 1863 | return; |
e0ab53de | 1864 | task->tk_action = call_transmit_status; |
1da177e4 | 1865 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1866 | if (rpc_task_need_encode(task)) { |
b0e1c57e | 1867 | rpc_xdr_encode(task); |
5e5ce5be | 1868 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1869 | if (task->tk_status != 0) { |
1870 | /* Was the error nonfatal? */ | |
1871 | if (task->tk_status == -EAGAIN) | |
1872 | rpc_delay(task, HZ >> 4); | |
1873 | else | |
1874 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1875 | return; |
8b39f2b4 | 1876 | } |
5e5ce5be | 1877 | } |
1da177e4 LT |
1878 | xprt_transmit(task); |
1879 | if (task->tk_status < 0) | |
1880 | return; | |
ca7f33aa TM |
1881 | if (is_retrans) |
1882 | task->tk_client->cl_stats->rpcretrans++; | |
e0ab53de TM |
1883 | /* |
1884 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1885 | * in order to allow access to the socket to other RPC requests. | |
1886 | */ | |
1887 | call_transmit_status(task); | |
55ae1aab | 1888 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1889 | return; |
1890 | task->tk_action = rpc_exit_task; | |
a4f0835c | 1891 | rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task); |
e0ab53de TM |
1892 | } |
1893 | ||
1894 | /* | |
1895 | * 5a. Handle cleanup after a transmission | |
1896 | */ | |
1897 | static void | |
1898 | call_transmit_status(struct rpc_task *task) | |
1899 | { | |
1900 | task->tk_action = call_status; | |
206a134b CL |
1901 | |
1902 | /* | |
1903 | * Common case: success. Force the compiler to put this | |
1904 | * test first. | |
1905 | */ | |
1906 | if (task->tk_status == 0) { | |
1907 | xprt_end_transmit(task); | |
1908 | rpc_task_force_reencode(task); | |
1909 | return; | |
1910 | } | |
1911 | ||
15f081ca TM |
1912 | switch (task->tk_status) { |
1913 | case -EAGAIN: | |
1914 | break; | |
1915 | default: | |
206a134b | 1916 | dprint_status(task); |
15f081ca | 1917 | xprt_end_transmit(task); |
09a21c41 CL |
1918 | rpc_task_force_reencode(task); |
1919 | break; | |
15f081ca TM |
1920 | /* |
1921 | * Special cases: if we've been waiting on the | |
1922 | * socket's write_space() callback, or if the | |
1923 | * socket just returned a connection error, | |
1924 | * then hold onto the transport lock. | |
1925 | */ | |
1926 | case -ECONNREFUSED: | |
15f081ca TM |
1927 | case -EHOSTDOWN: |
1928 | case -EHOSTUNREACH: | |
1929 | case -ENETUNREACH: | |
3dedbb5c | 1930 | case -EPERM: |
09a21c41 CL |
1931 | if (RPC_IS_SOFTCONN(task)) { |
1932 | xprt_end_transmit(task); | |
1933 | rpc_exit(task, task->tk_status); | |
1934 | break; | |
1935 | } | |
1936 | case -ECONNRESET: | |
df277270 | 1937 | case -ECONNABORTED: |
3913c78c | 1938 | case -EADDRINUSE: |
09a21c41 | 1939 | case -ENOTCONN: |
3601c4a9 | 1940 | case -ENOBUFS: |
c8485e4d | 1941 | case -EPIPE: |
15f081ca TM |
1942 | rpc_task_force_reencode(task); |
1943 | } | |
1da177e4 LT |
1944 | } |
1945 | ||
9e00abc3 | 1946 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1947 | /* |
1948 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1949 | * addition, disconnect on connectivity errors. | |
1950 | */ | |
1951 | static void | |
1952 | call_bc_transmit(struct rpc_task *task) | |
1953 | { | |
1954 | struct rpc_rqst *req = task->tk_rqstp; | |
1955 | ||
90051ea7 | 1956 | if (!xprt_prepare_transmit(task)) { |
55ae1aab RL |
1957 | /* |
1958 | * Could not reserve the transport. Try again after the | |
1959 | * transport is released. | |
1960 | */ | |
1961 | task->tk_status = 0; | |
1962 | task->tk_action = call_bc_transmit; | |
1963 | return; | |
1964 | } | |
1965 | ||
1966 | task->tk_action = rpc_exit_task; | |
1967 | if (task->tk_status < 0) { | |
1968 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1969 | "error: %d\n", task->tk_status); | |
1970 | return; | |
1971 | } | |
1972 | ||
1973 | xprt_transmit(task); | |
1974 | xprt_end_transmit(task); | |
1975 | dprint_status(task); | |
1976 | switch (task->tk_status) { | |
1977 | case 0: | |
1978 | /* Success */ | |
1979 | break; | |
1980 | case -EHOSTDOWN: | |
1981 | case -EHOSTUNREACH: | |
1982 | case -ENETUNREACH: | |
1983 | case -ETIMEDOUT: | |
1984 | /* | |
1985 | * Problem reaching the server. Disconnect and let the | |
1986 | * forechannel reestablish the connection. The server will | |
1987 | * have to retransmit the backchannel request and we'll | |
1988 | * reprocess it. Since these ops are idempotent, there's no | |
1989 | * need to cache our reply at this time. | |
1990 | */ | |
1991 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1992 | "error: %d\n", task->tk_status); | |
a4f0835c | 1993 | xprt_conditional_disconnect(req->rq_xprt, |
55ae1aab RL |
1994 | req->rq_connect_cookie); |
1995 | break; | |
1996 | default: | |
1997 | /* | |
1998 | * We were unable to reply and will have to drop the | |
1999 | * request. The server should reconnect and retransmit. | |
2000 | */ | |
1facf4c4 | 2001 | WARN_ON_ONCE(task->tk_status == -EAGAIN); |
55ae1aab RL |
2002 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
2003 | "error: %d\n", task->tk_status); | |
2004 | break; | |
2005 | } | |
2006 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
2007 | } | |
9e00abc3 | 2008 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 2009 | |
1da177e4 LT |
2010 | /* |
2011 | * 6. Sort out the RPC call status | |
2012 | */ | |
2013 | static void | |
2014 | call_status(struct rpc_task *task) | |
2015 | { | |
2016 | struct rpc_clnt *clnt = task->tk_client; | |
2017 | struct rpc_rqst *req = task->tk_rqstp; | |
2018 | int status; | |
2019 | ||
dd2b63d0 RL |
2020 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
2021 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 2022 | |
46121cf7 | 2023 | dprint_status(task); |
1da177e4 LT |
2024 | |
2025 | status = task->tk_status; | |
2026 | if (status >= 0) { | |
2027 | task->tk_action = call_decode; | |
2028 | return; | |
2029 | } | |
2030 | ||
5753cba1 | 2031 | trace_rpc_call_status(task); |
1da177e4 LT |
2032 | task->tk_status = 0; |
2033 | switch(status) { | |
76303992 TM |
2034 | case -EHOSTDOWN: |
2035 | case -EHOSTUNREACH: | |
2036 | case -ENETUNREACH: | |
3dedbb5c | 2037 | case -EPERM: |
9455e3f4 TM |
2038 | if (RPC_IS_SOFTCONN(task)) { |
2039 | rpc_exit(task, status); | |
2040 | break; | |
2041 | } | |
76303992 TM |
2042 | /* |
2043 | * Delay any retries for 3 seconds, then handle as if it | |
2044 | * were a timeout. | |
2045 | */ | |
2046 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
2047 | case -ETIMEDOUT: |
2048 | task->tk_action = call_timeout; | |
8a19a0b6 TM |
2049 | if (!(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) |
2050 | && task->tk_client->cl_discrtry) | |
a4f0835c | 2051 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2052 | req->rq_connect_cookie); |
1da177e4 LT |
2053 | break; |
2054 | case -ECONNREFUSED: | |
df277270 TM |
2055 | case -ECONNRESET: |
2056 | case -ECONNABORTED: | |
35f5a422 | 2057 | rpc_force_rebind(clnt); |
3913c78c | 2058 | case -EADDRINUSE: |
3601c4a9 | 2059 | case -ENOBUFS: |
c8485e4d TM |
2060 | rpc_delay(task, 3*HZ); |
2061 | case -EPIPE: | |
2062 | case -ENOTCONN: | |
1da177e4 LT |
2063 | task->tk_action = call_bind; |
2064 | break; | |
2065 | case -EAGAIN: | |
2066 | task->tk_action = call_transmit; | |
2067 | break; | |
2068 | case -EIO: | |
2069 | /* shutdown or soft timeout */ | |
2070 | rpc_exit(task, status); | |
2071 | break; | |
2072 | default: | |
b6b6152c OK |
2073 | if (clnt->cl_chatty) |
2074 | printk("%s: RPC call returned error %d\n", | |
55909f21 | 2075 | clnt->cl_program->name, -status); |
1da177e4 | 2076 | rpc_exit(task, status); |
1da177e4 LT |
2077 | } |
2078 | } | |
2079 | ||
2080 | /* | |
e0ab53de | 2081 | * 6a. Handle RPC timeout |
1da177e4 LT |
2082 | * We do not release the request slot, so we keep using the |
2083 | * same XID for all retransmits. | |
2084 | */ | |
2085 | static void | |
2086 | call_timeout(struct rpc_task *task) | |
2087 | { | |
2088 | struct rpc_clnt *clnt = task->tk_client; | |
2089 | ||
2090 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 2091 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
2092 | goto retry; |
2093 | } | |
2094 | ||
46121cf7 | 2095 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
2096 | task->tk_timeouts++; |
2097 | ||
3a28becc CL |
2098 | if (RPC_IS_SOFTCONN(task)) { |
2099 | rpc_exit(task, -ETIMEDOUT); | |
2100 | return; | |
2101 | } | |
1da177e4 | 2102 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 2103 | if (clnt->cl_chatty) { |
4e0038b6 | 2104 | rcu_read_lock(); |
b6b6152c | 2105 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
55909f21 | 2106 | clnt->cl_program->name, |
4e0038b6 TM |
2107 | rcu_dereference(clnt->cl_xprt)->servername); |
2108 | rcu_read_unlock(); | |
cac5d07e | 2109 | } |
7494d00c TM |
2110 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
2111 | rpc_exit(task, -ETIMEDOUT); | |
2112 | else | |
2113 | rpc_exit(task, -EIO); | |
1da177e4 LT |
2114 | return; |
2115 | } | |
2116 | ||
f518e35a | 2117 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 2118 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
2119 | if (clnt->cl_chatty) { |
2120 | rcu_read_lock(); | |
b6b6152c | 2121 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
55909f21 | 2122 | clnt->cl_program->name, |
4e0038b6 TM |
2123 | rcu_dereference(clnt->cl_xprt)->servername); |
2124 | rcu_read_unlock(); | |
2125 | } | |
1da177e4 | 2126 | } |
35f5a422 | 2127 | rpc_force_rebind(clnt); |
b48633bd TM |
2128 | /* |
2129 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
2130 | * event? RFC2203 requires the server to drop all such requests. | |
2131 | */ | |
2132 | rpcauth_invalcred(task); | |
1da177e4 LT |
2133 | |
2134 | retry: | |
1da177e4 LT |
2135 | task->tk_action = call_bind; |
2136 | task->tk_status = 0; | |
2137 | } | |
2138 | ||
2139 | /* | |
2140 | * 7. Decode the RPC reply | |
2141 | */ | |
2142 | static void | |
2143 | call_decode(struct rpc_task *task) | |
2144 | { | |
2145 | struct rpc_clnt *clnt = task->tk_client; | |
2146 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 2147 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 2148 | __be32 *p; |
1da177e4 | 2149 | |
726fd6ad | 2150 | dprint_status(task); |
1da177e4 | 2151 | |
f518e35a | 2152 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
2153 | if (clnt->cl_chatty) { |
2154 | rcu_read_lock(); | |
b6b6152c | 2155 | printk(KERN_NOTICE "%s: server %s OK\n", |
55909f21 | 2156 | clnt->cl_program->name, |
4e0038b6 TM |
2157 | rcu_dereference(clnt->cl_xprt)->servername); |
2158 | rcu_read_unlock(); | |
2159 | } | |
1da177e4 LT |
2160 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
2161 | } | |
2162 | ||
43ac3f29 TM |
2163 | /* |
2164 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 2165 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
2166 | */ |
2167 | smp_rmb(); | |
1da177e4 LT |
2168 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
2169 | ||
2170 | /* Check that the softirq receive buffer is valid */ | |
2171 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
2172 | sizeof(req->rq_rcv_buf)) != 0); | |
2173 | ||
1e799b67 TM |
2174 | if (req->rq_rcv_buf.len < 12) { |
2175 | if (!RPC_IS_SOFT(task)) { | |
2176 | task->tk_action = call_bind; | |
1e799b67 TM |
2177 | goto out_retry; |
2178 | } | |
2179 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
55909f21 | 2180 | clnt->cl_program->name, task->tk_status); |
1e799b67 TM |
2181 | task->tk_action = call_timeout; |
2182 | goto out_retry; | |
2183 | } | |
2184 | ||
b0e1c57e | 2185 | p = rpc_verify_header(task); |
abbcf28f TM |
2186 | if (IS_ERR(p)) { |
2187 | if (p == ERR_PTR(-EAGAIN)) | |
2188 | goto out_retry; | |
2189 | return; | |
1da177e4 LT |
2190 | } |
2191 | ||
abbcf28f | 2192 | task->tk_action = rpc_exit_task; |
1da177e4 | 2193 | |
6d5fcb5a | 2194 | if (decode) { |
1da177e4 LT |
2195 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
2196 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 2197 | } |
46121cf7 CL |
2198 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
2199 | task->tk_status); | |
1da177e4 LT |
2200 | return; |
2201 | out_retry: | |
1da177e4 | 2202 | task->tk_status = 0; |
b0e1c57e | 2203 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 2204 | if (task->tk_rqstp == req) { |
dd2b63d0 | 2205 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 2206 | if (task->tk_client->cl_discrtry) |
a4f0835c | 2207 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2208 | req->rq_connect_cookie); |
24b74bf0 | 2209 | } |
1da177e4 LT |
2210 | } |
2211 | ||
d8ed029d | 2212 | static __be32 * |
b0e1c57e | 2213 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
2214 | { |
2215 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2216 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 2217 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
2218 | |
2219 | /* FIXME: check buffer size? */ | |
808012fb | 2220 | |
a4f0835c | 2221 | p = xprt_skip_transport_header(req->rq_xprt, p); |
1da177e4 LT |
2222 | *p++ = req->rq_xid; /* XID */ |
2223 | *p++ = htonl(RPC_CALL); /* CALL */ | |
2224 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
2225 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
2226 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
2227 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
2228 | p = rpcauth_marshcred(task, p); |
2229 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
2230 | return p; | |
1da177e4 LT |
2231 | } |
2232 | ||
d8ed029d | 2233 | static __be32 * |
b0e1c57e | 2234 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 2235 | { |
4e0038b6 | 2236 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
2237 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
2238 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
2239 | __be32 *p = iov->iov_base; |
2240 | u32 n; | |
1da177e4 LT |
2241 | int error = -EACCES; |
2242 | ||
e8896495 DH |
2243 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
2244 | /* RFC-1014 says that the representation of XDR data must be a | |
2245 | * multiple of four bytes | |
2246 | * - if it isn't pointer subtraction in the NFS client may give | |
2247 | * undefined results | |
2248 | */ | |
8a702bbb | 2249 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2250 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2251 | task->tk_rqstp->rq_rcv_buf.len); |
35fa5f7b AA |
2252 | error = -EIO; |
2253 | goto out_err; | |
e8896495 | 2254 | } |
1da177e4 LT |
2255 | if ((len -= 3) < 0) |
2256 | goto out_overflow; | |
1da177e4 | 2257 | |
f4a2e418 | 2258 | p += 1; /* skip XID */ |
1da177e4 | 2259 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2260 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2261 | task->tk_pid, __func__, n); |
35fa5f7b | 2262 | error = -EIO; |
abbcf28f | 2263 | goto out_garbage; |
1da177e4 | 2264 | } |
f4a2e418 | 2265 | |
1da177e4 LT |
2266 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2267 | if (--len < 0) | |
2268 | goto out_overflow; | |
2269 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2270 | case RPC_AUTH_ERROR: |
2271 | break; | |
2272 | case RPC_MISMATCH: | |
2273 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2274 | task->tk_pid, __func__); | |
2275 | error = -EPROTONOSUPPORT; | |
2276 | goto out_err; | |
2277 | default: | |
2278 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2279 | "unknown error: %x\n", | |
2280 | task->tk_pid, __func__, n); | |
35fa5f7b AA |
2281 | error = -EIO; |
2282 | goto out_err; | |
1da177e4 LT |
2283 | } |
2284 | if (--len < 0) | |
2285 | goto out_overflow; | |
2286 | switch ((n = ntohl(*p++))) { | |
2287 | case RPC_AUTH_REJECTEDCRED: | |
2288 | case RPC_AUTH_REJECTEDVERF: | |
2289 | case RPCSEC_GSS_CREDPROBLEM: | |
2290 | case RPCSEC_GSS_CTXPROBLEM: | |
2291 | if (!task->tk_cred_retry) | |
2292 | break; | |
2293 | task->tk_cred_retry--; | |
46121cf7 | 2294 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2295 | task->tk_pid, __func__); |
1da177e4 | 2296 | rpcauth_invalcred(task); |
220bcc2a TM |
2297 | /* Ensure we obtain a new XID! */ |
2298 | xprt_release(task); | |
118df3d1 | 2299 | task->tk_action = call_reserve; |
abbcf28f | 2300 | goto out_retry; |
1da177e4 LT |
2301 | case RPC_AUTH_BADCRED: |
2302 | case RPC_AUTH_BADVERF: | |
2303 | /* possibly garbled cred/verf? */ | |
2304 | if (!task->tk_garb_retry) | |
2305 | break; | |
2306 | task->tk_garb_retry--; | |
46121cf7 | 2307 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2308 | task->tk_pid, __func__); |
1da177e4 | 2309 | task->tk_action = call_bind; |
abbcf28f | 2310 | goto out_retry; |
1da177e4 | 2311 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2312 | rcu_read_lock(); |
b0e1c57e | 2313 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2314 | "authentication.\n", |
2315 | rcu_dereference(clnt->cl_xprt)->servername); | |
2316 | rcu_read_unlock(); | |
1da177e4 LT |
2317 | break; |
2318 | default: | |
8a702bbb | 2319 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2320 | task->tk_pid, __func__, n); |
1da177e4 LT |
2321 | error = -EIO; |
2322 | } | |
46121cf7 | 2323 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2324 | task->tk_pid, __func__, n); |
1da177e4 LT |
2325 | goto out_err; |
2326 | } | |
35fa5f7b AA |
2327 | p = rpcauth_checkverf(task, p); |
2328 | if (IS_ERR(p)) { | |
2329 | error = PTR_ERR(p); | |
2330 | dprintk("RPC: %5u %s: auth check failed with %d\n", | |
2331 | task->tk_pid, __func__, error); | |
abbcf28f | 2332 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2333 | } |
d8ed029d | 2334 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2335 | if (len < 0) |
2336 | goto out_overflow; | |
2337 | switch ((n = ntohl(*p++))) { | |
2338 | case RPC_SUCCESS: | |
2339 | return p; | |
2340 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2341 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2342 | "by server %s\n", task->tk_pid, __func__, | |
2343 | (unsigned int)clnt->cl_prog, | |
2344 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2345 | error = -EPFNOSUPPORT; |
2346 | goto out_err; | |
1da177e4 | 2347 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2348 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2349 | "by server %s\n", task->tk_pid, __func__, | |
2350 | (unsigned int)clnt->cl_prog, | |
2351 | (unsigned int)clnt->cl_vers, | |
2352 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2353 | error = -EPROTONOSUPPORT; |
2354 | goto out_err; | |
1da177e4 | 2355 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2356 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2357 | "version %u on server %s\n", |
0dc47877 | 2358 | task->tk_pid, __func__, |
3748f1e4 | 2359 | rpc_proc_name(task), |
4e0038b6 TM |
2360 | clnt->cl_prog, clnt->cl_vers, |
2361 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2362 | error = -EOPNOTSUPP; |
2363 | goto out_err; | |
1da177e4 | 2364 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2365 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2366 | task->tk_pid, __func__); |
1da177e4 LT |
2367 | break; /* retry */ |
2368 | default: | |
8a702bbb | 2369 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2370 | task->tk_pid, __func__, n); |
1da177e4 LT |
2371 | /* Also retry */ |
2372 | } | |
2373 | ||
abbcf28f | 2374 | out_garbage: |
4e0038b6 | 2375 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2376 | if (task->tk_garb_retry) { |
2377 | task->tk_garb_retry--; | |
46121cf7 | 2378 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2379 | task->tk_pid, __func__); |
1da177e4 | 2380 | task->tk_action = call_bind; |
abbcf28f TM |
2381 | out_retry: |
2382 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2383 | } |
1da177e4 LT |
2384 | out_err: |
2385 | rpc_exit(task, error); | |
8a702bbb | 2386 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2387 | __func__, error); |
abbcf28f | 2388 | return ERR_PTR(error); |
1da177e4 | 2389 | out_overflow: |
8a702bbb | 2390 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2391 | __func__); |
abbcf28f | 2392 | goto out_garbage; |
1da177e4 | 2393 | } |
5ee0ed7d | 2394 | |
9f06c719 | 2395 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2396 | { |
5ee0ed7d TM |
2397 | } |
2398 | ||
bf269551 | 2399 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2400 | { |
2401 | return 0; | |
2402 | } | |
2403 | ||
2404 | static struct rpc_procinfo rpcproc_null = { | |
2405 | .p_encode = rpcproc_encode_null, | |
2406 | .p_decode = rpcproc_decode_null, | |
2407 | }; | |
2408 | ||
caabea8a | 2409 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2410 | { |
2411 | struct rpc_message msg = { | |
2412 | .rpc_proc = &rpcproc_null, | |
2413 | }; | |
2414 | int err; | |
2415 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2416 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2417 | put_rpccred(msg.rpc_cred); |
2418 | return err; | |
2419 | } | |
188fef11 | 2420 | |
5e1550d6 TM |
2421 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2422 | { | |
2423 | struct rpc_message msg = { | |
2424 | .rpc_proc = &rpcproc_null, | |
2425 | .rpc_cred = cred, | |
2426 | }; | |
84115e1c TM |
2427 | struct rpc_task_setup task_setup_data = { |
2428 | .rpc_client = clnt, | |
2429 | .rpc_message = &msg, | |
2430 | .callback_ops = &rpc_default_ops, | |
2431 | .flags = flags, | |
2432 | }; | |
c970aa85 | 2433 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2434 | } |
e8914c65 | 2435 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2436 | |
f895b252 | 2437 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
68a23ee9 CL |
2438 | static void rpc_show_header(void) |
2439 | { | |
cb3997b5 CL |
2440 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2441 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2442 | } |
2443 | ||
38e886e0 CL |
2444 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2445 | const struct rpc_task *task) | |
2446 | { | |
2447 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2448 | |
2449 | if (RPC_IS_QUEUED(task)) | |
2450 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2451 | ||
b3bcedad | 2452 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2453 | task->tk_pid, task->tk_flags, task->tk_status, |
2454 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
55909f21 | 2455 | clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), |
b3bcedad | 2456 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2457 | } |
2458 | ||
70abc49b | 2459 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2460 | { |
2461 | struct rpc_clnt *clnt; | |
38e886e0 | 2462 | struct rpc_task *task; |
68a23ee9 | 2463 | int header = 0; |
70abc49b | 2464 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2465 | |
70abc49b SK |
2466 | spin_lock(&sn->rpc_client_lock); |
2467 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2468 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2469 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2470 | if (!header) { |
2471 | rpc_show_header(); | |
2472 | header++; | |
2473 | } | |
38e886e0 | 2474 | rpc_show_task(clnt, task); |
188fef11 TM |
2475 | } |
2476 | spin_unlock(&clnt->cl_lock); | |
2477 | } | |
70abc49b | 2478 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2479 | } |
2480 | #endif |