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 | |
f9c72d10 | 306 | rpc_clnt_debugfs_register(clnt); |
b4b9d2cc | 307 | |
e73f4cc0 SK |
308 | pipefs_sb = rpc_get_sb_net(net); |
309 | if (pipefs_sb) { | |
41b6b4d0 | 310 | err = rpc_setup_pipedir(pipefs_sb, clnt); |
e73f4cc0 SK |
311 | if (err) |
312 | goto out; | |
313 | } | |
314 | ||
eeee2452 TM |
315 | rpc_register_client(clnt); |
316 | if (pipefs_sb) | |
317 | rpc_put_sb_net(net); | |
318 | ||
c2190661 | 319 | auth = rpcauth_create(&auth_args, clnt); |
e73f4cc0 SK |
320 | if (IS_ERR(auth)) { |
321 | dprintk("RPC: Couldn't create auth handle (flavor %u)\n", | |
d746e545 | 322 | pseudoflavor); |
e73f4cc0 SK |
323 | err = PTR_ERR(auth); |
324 | goto err_auth; | |
325 | } | |
eeee2452 TM |
326 | return 0; |
327 | err_auth: | |
328 | pipefs_sb = rpc_get_sb_net(net); | |
1540c5d3 | 329 | rpc_unregister_client(clnt); |
eeee2452 | 330 | __rpc_clnt_remove_pipedir(clnt); |
e73f4cc0 SK |
331 | out: |
332 | if (pipefs_sb) | |
333 | rpc_put_sb_net(net); | |
b4b9d2cc | 334 | rpc_clnt_debugfs_unregister(clnt); |
e73f4cc0 | 335 | return err; |
e73f4cc0 SK |
336 | } |
337 | ||
2f048db4 TM |
338 | static DEFINE_IDA(rpc_clids); |
339 | ||
340 | static int rpc_alloc_clid(struct rpc_clnt *clnt) | |
341 | { | |
342 | int clid; | |
343 | ||
344 | clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL); | |
345 | if (clid < 0) | |
346 | return clid; | |
347 | clnt->cl_clid = clid; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static void rpc_free_clid(struct rpc_clnt *clnt) | |
352 | { | |
353 | ida_simple_remove(&rpc_clids, clnt->cl_clid); | |
354 | } | |
355 | ||
280ebcf9 TM |
356 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, |
357 | struct rpc_xprt *xprt, | |
358 | struct rpc_clnt *parent) | |
1da177e4 | 359 | { |
a613fa16 TM |
360 | const struct rpc_program *program = args->program; |
361 | const struct rpc_version *version; | |
40b00b6b TM |
362 | struct rpc_clnt *clnt = NULL; |
363 | const struct rpc_timeout *timeout; | |
03a9a42a | 364 | const char *nodename = args->nodename; |
1da177e4 | 365 | int err; |
06b8d255 CL |
366 | |
367 | /* sanity check the name before trying to print it */ | |
46121cf7 | 368 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 369 | program->name, args->servername, xprt); |
1da177e4 | 370 | |
4ada539e TM |
371 | err = rpciod_up(); |
372 | if (err) | |
373 | goto out_no_rpciod; | |
698b6d08 | 374 | |
f05c124a | 375 | err = -EINVAL; |
698b6d08 TM |
376 | if (args->version >= program->nrvers) |
377 | goto out_err; | |
378 | version = program->version[args->version]; | |
379 | if (version == NULL) | |
1da177e4 LT |
380 | goto out_err; |
381 | ||
382 | err = -ENOMEM; | |
0da974f4 | 383 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
384 | if (!clnt) |
385 | goto out_err; | |
280ebcf9 | 386 | clnt->cl_parent = parent ? : clnt; |
1da177e4 | 387 | |
2f048db4 TM |
388 | err = rpc_alloc_clid(clnt); |
389 | if (err) | |
390 | goto out_no_clid; | |
1da177e4 | 391 | |
1da177e4 LT |
392 | clnt->cl_procinfo = version->procs; |
393 | clnt->cl_maxproc = version->nrprocs; | |
d5b337b4 | 394 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 395 | clnt->cl_vers = version->number; |
1da177e4 | 396 | clnt->cl_stats = program->stats; |
11c556b3 | 397 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
6739ffb7 | 398 | rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); |
23bf85ba TM |
399 | err = -ENOMEM; |
400 | if (clnt->cl_metrics == NULL) | |
401 | goto out_no_stats; | |
3e32a5d9 | 402 | clnt->cl_program = program; |
6529eba0 | 403 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 404 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 405 | |
40b00b6b | 406 | timeout = xprt->timeout; |
ba7392bb TM |
407 | if (args->timeout != NULL) { |
408 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
409 | sizeof(clnt->cl_timeout_default)); | |
40b00b6b | 410 | timeout = &clnt->cl_timeout_default; |
ba7392bb TM |
411 | } |
412 | ||
40b00b6b TM |
413 | rpc_clnt_set_transport(clnt, xprt, timeout); |
414 | ||
1da177e4 | 415 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 416 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
1da177e4 | 417 | |
006abe88 | 418 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 419 | |
03a9a42a TM |
420 | if (nodename == NULL) |
421 | nodename = utsname()->nodename; | |
1da177e4 | 422 | /* save the nodename */ |
03a9a42a | 423 | rpc_clnt_set_nodename(clnt, nodename); |
e73f4cc0 | 424 | |
d746e545 | 425 | err = rpc_client_register(clnt, args->authflavor, args->client_name); |
e73f4cc0 SK |
426 | if (err) |
427 | goto out_no_path; | |
280ebcf9 TM |
428 | if (parent) |
429 | atomic_inc(&parent->cl_count); | |
1da177e4 LT |
430 | return clnt; |
431 | ||
1da177e4 | 432 | out_no_path: |
23bf85ba TM |
433 | rpc_free_iostats(clnt->cl_metrics); |
434 | out_no_stats: | |
2f048db4 TM |
435 | rpc_free_clid(clnt); |
436 | out_no_clid: | |
1da177e4 LT |
437 | kfree(clnt); |
438 | out_err: | |
4ada539e TM |
439 | rpciod_down(); |
440 | out_no_rpciod: | |
f05c124a | 441 | xprt_put(xprt); |
1da177e4 LT |
442 | return ERR_PTR(err); |
443 | } | |
444 | ||
83ddfebd KM |
445 | struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args, |
446 | struct rpc_xprt *xprt) | |
447 | { | |
448 | struct rpc_clnt *clnt = NULL; | |
449 | ||
450 | clnt = rpc_new_client(args, xprt, NULL); | |
451 | if (IS_ERR(clnt)) | |
452 | return clnt; | |
453 | ||
454 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
455 | int err = rpc_ping(clnt); | |
456 | if (err != 0) { | |
457 | rpc_shutdown_client(clnt); | |
458 | return ERR_PTR(err); | |
459 | } | |
460 | } | |
461 | ||
462 | clnt->cl_softrtry = 1; | |
463 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
464 | clnt->cl_softrtry = 0; | |
465 | ||
466 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
467 | clnt->cl_autobind = 1; | |
2aca5b86 TM |
468 | if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT) |
469 | clnt->cl_noretranstimeo = 1; | |
83ddfebd KM |
470 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
471 | clnt->cl_discrtry = 1; | |
472 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) | |
473 | clnt->cl_chatty = 1; | |
474 | ||
475 | return clnt; | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(rpc_create_xprt); | |
478 | ||
2c53040f | 479 | /** |
c2866763 CL |
480 | * rpc_create - create an RPC client and transport with one call |
481 | * @args: rpc_clnt create argument structure | |
482 | * | |
483 | * Creates and initializes an RPC transport and an RPC client. | |
484 | * | |
485 | * It can ping the server in order to determine if it is up, and to see if | |
486 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
487 | * this behavior so asynchronous tasks can also use rpc_create. | |
488 | */ | |
489 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
490 | { | |
491 | struct rpc_xprt *xprt; | |
3c341b0b | 492 | struct xprt_create xprtargs = { |
9a23e332 | 493 | .net = args->net, |
4fa016eb | 494 | .ident = args->protocol, |
d3bc9a1d | 495 | .srcaddr = args->saddress, |
96802a09 FM |
496 | .dstaddr = args->address, |
497 | .addrlen = args->addrsize, | |
4e0038b6 | 498 | .servername = args->servername, |
f300baba | 499 | .bc_xprt = args->bc_xprt, |
96802a09 | 500 | }; |
510deb0d | 501 | char servername[48]; |
c2866763 | 502 | |
b7993ceb TM |
503 | if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) |
504 | xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; | |
33d90ac0 BF |
505 | if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) |
506 | xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; | |
43780b87 CL |
507 | /* |
508 | * If the caller chooses not to specify a hostname, whip | |
509 | * up a string representation of the passed-in address. | |
510 | */ | |
4e0038b6 | 511 | if (xprtargs.servername == NULL) { |
176e21ee CL |
512 | struct sockaddr_un *sun = |
513 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
514 | struct sockaddr_in *sin = |
515 | (struct sockaddr_in *)args->address; | |
516 | struct sockaddr_in6 *sin6 = | |
517 | (struct sockaddr_in6 *)args->address; | |
518 | ||
510deb0d CL |
519 | servername[0] = '\0'; |
520 | switch (args->address->sa_family) { | |
176e21ee CL |
521 | case AF_LOCAL: |
522 | snprintf(servername, sizeof(servername), "%s", | |
523 | sun->sun_path); | |
524 | break; | |
da09eb93 | 525 | case AF_INET: |
21454aaa HH |
526 | snprintf(servername, sizeof(servername), "%pI4", |
527 | &sin->sin_addr.s_addr); | |
510deb0d | 528 | break; |
da09eb93 | 529 | case AF_INET6: |
5b095d98 | 530 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 531 | &sin6->sin6_addr); |
510deb0d | 532 | break; |
510deb0d CL |
533 | default: |
534 | /* caller wants default server name, but | |
535 | * address family isn't recognized. */ | |
536 | return ERR_PTR(-EINVAL); | |
537 | } | |
4e0038b6 | 538 | xprtargs.servername = servername; |
43780b87 CL |
539 | } |
540 | ||
510deb0d CL |
541 | xprt = xprt_create_transport(&xprtargs); |
542 | if (IS_ERR(xprt)) | |
543 | return (struct rpc_clnt *)xprt; | |
544 | ||
c2866763 CL |
545 | /* |
546 | * By default, kernel RPC client connects from a reserved port. | |
547 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
548 | * but it is always enabled for rpciod, which handles the connect | |
549 | * operation. | |
550 | */ | |
551 | xprt->resvport = 1; | |
552 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
553 | xprt->resvport = 0; | |
554 | ||
83ddfebd | 555 | return rpc_create_xprt(args, xprt); |
c2866763 | 556 | } |
b86acd50 | 557 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 558 | |
1da177e4 LT |
559 | /* |
560 | * This function clones the RPC client structure. It allows us to share the | |
561 | * same transport while varying parameters such as the authentication | |
562 | * flavour. | |
563 | */ | |
1b63a751 CL |
564 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
565 | struct rpc_clnt *clnt) | |
1da177e4 | 566 | { |
2446ab60 | 567 | struct rpc_xprt *xprt; |
1b63a751 CL |
568 | struct rpc_clnt *new; |
569 | int err; | |
1da177e4 | 570 | |
1b63a751 | 571 | err = -ENOMEM; |
2446ab60 TM |
572 | rcu_read_lock(); |
573 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
574 | rcu_read_unlock(); | |
575 | if (xprt == NULL) | |
1b63a751 CL |
576 | goto out_err; |
577 | args->servername = xprt->servername; | |
03a9a42a | 578 | args->nodename = clnt->cl_nodename; |
1b63a751 | 579 | |
280ebcf9 | 580 | new = rpc_new_client(args, xprt, clnt); |
1b63a751 CL |
581 | if (IS_ERR(new)) { |
582 | err = PTR_ERR(new); | |
a58e0be6 | 583 | goto out_err; |
1b63a751 CL |
584 | } |
585 | ||
1b63a751 CL |
586 | /* Turn off autobind on clones */ |
587 | new->cl_autobind = 0; | |
588 | new->cl_softrtry = clnt->cl_softrtry; | |
2aca5b86 | 589 | new->cl_noretranstimeo = clnt->cl_noretranstimeo; |
1b63a751 CL |
590 | new->cl_discrtry = clnt->cl_discrtry; |
591 | new->cl_chatty = clnt->cl_chatty; | |
1da177e4 | 592 | return new; |
1b63a751 | 593 | |
1b63a751 | 594 | out_err: |
0dc47877 | 595 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 596 | return ERR_PTR(err); |
1da177e4 | 597 | } |
1b63a751 CL |
598 | |
599 | /** | |
600 | * rpc_clone_client - Clone an RPC client structure | |
601 | * | |
602 | * @clnt: RPC client whose parameters are copied | |
603 | * | |
604 | * Returns a fresh RPC client or an ERR_PTR. | |
605 | */ | |
606 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
607 | { | |
608 | struct rpc_create_args args = { | |
609 | .program = clnt->cl_program, | |
610 | .prognumber = clnt->cl_prog, | |
611 | .version = clnt->cl_vers, | |
612 | .authflavor = clnt->cl_auth->au_flavor, | |
1b63a751 CL |
613 | }; |
614 | return __rpc_clone_client(&args, clnt); | |
615 | } | |
e8914c65 | 616 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 617 | |
ba9b584c CL |
618 | /** |
619 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
620 | * | |
621 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 622 | * @flavor: security flavor for new client |
ba9b584c CL |
623 | * |
624 | * Returns a fresh RPC client or an ERR_PTR. | |
625 | */ | |
626 | struct rpc_clnt * | |
627 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
628 | { | |
629 | struct rpc_create_args args = { | |
630 | .program = clnt->cl_program, | |
631 | .prognumber = clnt->cl_prog, | |
632 | .version = clnt->cl_vers, | |
633 | .authflavor = flavor, | |
ba9b584c CL |
634 | }; |
635 | return __rpc_clone_client(&args, clnt); | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
638 | ||
40b00b6b TM |
639 | /** |
640 | * rpc_switch_client_transport: switch the RPC transport on the fly | |
641 | * @clnt: pointer to a struct rpc_clnt | |
642 | * @args: pointer to the new transport arguments | |
643 | * @timeout: pointer to the new timeout parameters | |
644 | * | |
645 | * This function allows the caller to switch the RPC transport for the | |
646 | * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS | |
647 | * server, for instance. It assumes that the caller has ensured that | |
648 | * there are no active RPC tasks by using some form of locking. | |
649 | * | |
650 | * Returns zero if "clnt" is now using the new xprt. Otherwise a | |
651 | * negative errno is returned, and "clnt" continues to use the old | |
652 | * xprt. | |
653 | */ | |
654 | int rpc_switch_client_transport(struct rpc_clnt *clnt, | |
655 | struct xprt_create *args, | |
656 | const struct rpc_timeout *timeout) | |
657 | { | |
658 | const struct rpc_timeout *old_timeo; | |
659 | rpc_authflavor_t pseudoflavor; | |
660 | struct rpc_xprt *xprt, *old; | |
661 | struct rpc_clnt *parent; | |
662 | int err; | |
663 | ||
664 | xprt = xprt_create_transport(args); | |
665 | if (IS_ERR(xprt)) { | |
666 | dprintk("RPC: failed to create new xprt for clnt %p\n", | |
667 | clnt); | |
668 | return PTR_ERR(xprt); | |
669 | } | |
670 | ||
671 | pseudoflavor = clnt->cl_auth->au_flavor; | |
672 | ||
673 | old_timeo = clnt->cl_timeout; | |
674 | old = rpc_clnt_set_transport(clnt, xprt, timeout); | |
675 | ||
676 | rpc_unregister_client(clnt); | |
677 | __rpc_clnt_remove_pipedir(clnt); | |
b4b9d2cc | 678 | rpc_clnt_debugfs_unregister(clnt); |
40b00b6b TM |
679 | |
680 | /* | |
681 | * A new transport was created. "clnt" therefore | |
682 | * becomes the root of a new cl_parent tree. clnt's | |
683 | * children, if it has any, still point to the old xprt. | |
684 | */ | |
685 | parent = clnt->cl_parent; | |
686 | clnt->cl_parent = clnt; | |
687 | ||
688 | /* | |
689 | * The old rpc_auth cache cannot be re-used. GSS | |
690 | * contexts in particular are between a single | |
691 | * client and server. | |
692 | */ | |
693 | err = rpc_client_register(clnt, pseudoflavor, NULL); | |
694 | if (err) | |
695 | goto out_revert; | |
696 | ||
697 | synchronize_rcu(); | |
698 | if (parent != clnt) | |
699 | rpc_release_client(parent); | |
700 | xprt_put(old); | |
701 | dprintk("RPC: replaced xprt for clnt %p\n", clnt); | |
702 | return 0; | |
703 | ||
704 | out_revert: | |
705 | rpc_clnt_set_transport(clnt, old, old_timeo); | |
706 | clnt->cl_parent = parent; | |
707 | rpc_client_register(clnt, pseudoflavor, NULL); | |
708 | xprt_put(xprt); | |
709 | dprintk("RPC: failed to switch xprt for clnt %p\n", clnt); | |
710 | return err; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(rpc_switch_client_transport); | |
713 | ||
58f9612c TM |
714 | /* |
715 | * Kill all tasks for the given client. | |
716 | * XXX: kill their descendants as well? | |
717 | */ | |
718 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
719 | { | |
720 | struct rpc_task *rovr; | |
721 | ||
722 | ||
723 | if (list_empty(&clnt->cl_tasks)) | |
724 | return; | |
725 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
726 | /* | |
727 | * Spin lock all_tasks to prevent changes... | |
728 | */ | |
729 | spin_lock(&clnt->cl_lock); | |
730 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
731 | if (!RPC_IS_ACTIVATED(rovr)) | |
732 | continue; | |
733 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
734 | rovr->tk_flags |= RPC_TASK_KILLED; | |
735 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
736 | if (RPC_IS_QUEUED(rovr)) |
737 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
738 | rovr); | |
58f9612c TM |
739 | } |
740 | } | |
741 | spin_unlock(&clnt->cl_lock); | |
742 | } | |
743 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 747 | * requests. |
1da177e4 | 748 | */ |
4c402b40 | 749 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 750 | { |
168e4b39 WAA |
751 | might_sleep(); |
752 | ||
4e0038b6 | 753 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
55909f21 | 754 | clnt->cl_program->name, |
4e0038b6 | 755 | rcu_dereference(clnt->cl_xprt)->servername); |
1da177e4 | 756 | |
34f52e35 | 757 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 758 | rpc_killall_tasks(clnt); |
532347e2 | 759 | wait_event_timeout(destroy_wait, |
34f52e35 | 760 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
761 | } |
762 | ||
4c402b40 | 763 | rpc_release_client(clnt); |
1da177e4 | 764 | } |
e8914c65 | 765 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
766 | |
767 | /* | |
34f52e35 | 768 | * Free an RPC client |
1da177e4 | 769 | */ |
d07ba842 | 770 | static struct rpc_clnt * |
006abe88 | 771 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 772 | { |
d07ba842 TM |
773 | struct rpc_clnt *parent = NULL; |
774 | ||
4e0038b6 | 775 | dprintk_rcu("RPC: destroying %s client for %s\n", |
55909f21 | 776 | clnt->cl_program->name, |
4e0038b6 | 777 | rcu_dereference(clnt->cl_xprt)->servername); |
6eac7d3f | 778 | if (clnt->cl_parent != clnt) |
d07ba842 | 779 | parent = clnt->cl_parent; |
b4b9d2cc | 780 | rpc_clnt_debugfs_unregister(clnt); |
f5131257 | 781 | rpc_clnt_remove_pipedir(clnt); |
adb6fa7f | 782 | rpc_unregister_client(clnt); |
11c556b3 CL |
783 | rpc_free_iostats(clnt->cl_metrics); |
784 | clnt->cl_metrics = NULL; | |
2446ab60 | 785 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
4ada539e | 786 | rpciod_down(); |
2f048db4 | 787 | rpc_free_clid(clnt); |
1da177e4 | 788 | kfree(clnt); |
d07ba842 | 789 | return parent; |
1da177e4 LT |
790 | } |
791 | ||
1dd17ec6 TM |
792 | /* |
793 | * Free an RPC client | |
794 | */ | |
d07ba842 | 795 | static struct rpc_clnt * |
006abe88 | 796 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 797 | { |
d07ba842 TM |
798 | if (clnt->cl_auth == NULL) |
799 | return rpc_free_client(clnt); | |
1dd17ec6 TM |
800 | |
801 | /* | |
802 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
803 | * release remaining GSS contexts. This mechanism ensures | |
804 | * that it can do so safely. | |
805 | */ | |
006abe88 | 806 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
807 | rpcauth_release(clnt->cl_auth); |
808 | clnt->cl_auth = NULL; | |
006abe88 | 809 | if (atomic_dec_and_test(&clnt->cl_count)) |
d07ba842 TM |
810 | return rpc_free_client(clnt); |
811 | return NULL; | |
1dd17ec6 TM |
812 | } |
813 | ||
1da177e4 | 814 | /* |
34f52e35 | 815 | * Release reference to the RPC client |
1da177e4 LT |
816 | */ |
817 | void | |
818 | rpc_release_client(struct rpc_clnt *clnt) | |
819 | { | |
34f52e35 | 820 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 821 | |
d07ba842 TM |
822 | do { |
823 | if (list_empty(&clnt->cl_tasks)) | |
824 | wake_up(&destroy_wait); | |
825 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
826 | break; | |
827 | clnt = rpc_free_auth(clnt); | |
828 | } while (clnt != NULL); | |
34f52e35 | 829 | } |
1d658336 | 830 | EXPORT_SYMBOL_GPL(rpc_release_client); |
34f52e35 | 831 | |
007e251f AG |
832 | /** |
833 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
834 | * @old: old rpc_client |
835 | * @program: rpc program to set | |
836 | * @vers: rpc program version | |
007e251f AG |
837 | * |
838 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
839 | * of use for enabling different RPC programs to share the same transport. | |
840 | * The Sun NFSv2/v3 ACL protocol can do this. | |
841 | */ | |
842 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 843 | const struct rpc_program *program, |
89eb21c3 | 844 | u32 vers) |
007e251f | 845 | { |
f994c43d TM |
846 | struct rpc_create_args args = { |
847 | .program = program, | |
848 | .prognumber = program->number, | |
849 | .version = vers, | |
850 | .authflavor = old->cl_auth->au_flavor, | |
f994c43d | 851 | }; |
007e251f | 852 | struct rpc_clnt *clnt; |
007e251f AG |
853 | int err; |
854 | ||
f994c43d | 855 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
856 | if (IS_ERR(clnt)) |
857 | goto out; | |
caabea8a | 858 | err = rpc_ping(clnt); |
007e251f AG |
859 | if (err != 0) { |
860 | rpc_shutdown_client(clnt); | |
861 | clnt = ERR_PTR(err); | |
862 | } | |
cca5172a | 863 | out: |
007e251f AG |
864 | return clnt; |
865 | } | |
e8914c65 | 866 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 867 | |
58f9612c TM |
868 | void rpc_task_release_client(struct rpc_task *task) |
869 | { | |
870 | struct rpc_clnt *clnt = task->tk_client; | |
871 | ||
872 | if (clnt != NULL) { | |
873 | /* Remove from client task list */ | |
874 | spin_lock(&clnt->cl_lock); | |
875 | list_del(&task->tk_task); | |
876 | spin_unlock(&clnt->cl_lock); | |
877 | task->tk_client = NULL; | |
878 | ||
879 | rpc_release_client(clnt); | |
880 | } | |
881 | } | |
882 | ||
883 | static | |
884 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
885 | { | |
886 | if (clnt != NULL) { | |
887 | rpc_task_release_client(task); | |
888 | task->tk_client = clnt; | |
006abe88 | 889 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
890 | if (clnt->cl_softrtry) |
891 | task->tk_flags |= RPC_TASK_SOFT; | |
8a19a0b6 TM |
892 | if (clnt->cl_noretranstimeo) |
893 | task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT; | |
3c87ef6e JL |
894 | if (atomic_read(&clnt->cl_swapper)) |
895 | task->tk_flags |= RPC_TASK_SWAPPER; | |
58f9612c TM |
896 | /* Add to the client's list of all tasks */ |
897 | spin_lock(&clnt->cl_lock); | |
898 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
899 | spin_unlock(&clnt->cl_lock); | |
900 | } | |
901 | } | |
902 | ||
cbdabc7f AA |
903 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
904 | { | |
905 | rpc_task_release_client(task); | |
906 | rpc_task_set_client(task, clnt); | |
907 | } | |
908 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
909 | ||
910 | ||
58f9612c TM |
911 | static void |
912 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
913 | { | |
914 | if (msg != NULL) { | |
915 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
916 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
917 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
918 | if (msg->rpc_cred != NULL) |
919 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
920 | } |
921 | } | |
922 | ||
1da177e4 LT |
923 | /* |
924 | * Default callback for async RPC calls | |
925 | */ | |
926 | static void | |
963d8fe5 | 927 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
928 | { |
929 | } | |
930 | ||
963d8fe5 TM |
931 | static const struct rpc_call_ops rpc_default_ops = { |
932 | .rpc_call_done = rpc_default_callback, | |
933 | }; | |
934 | ||
c970aa85 TM |
935 | /** |
936 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
937 | * @task_setup_data: pointer to task initialisation data | |
938 | */ | |
939 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 940 | { |
19445b99 | 941 | struct rpc_task *task; |
6e5b70e9 | 942 | |
84115e1c | 943 | task = rpc_new_task(task_setup_data); |
19445b99 | 944 | if (IS_ERR(task)) |
50859259 | 945 | goto out; |
6e5b70e9 | 946 | |
58f9612c TM |
947 | rpc_task_set_client(task, task_setup_data->rpc_client); |
948 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
949 | ||
58f9612c TM |
950 | if (task->tk_action == NULL) |
951 | rpc_call_start(task); | |
952 | ||
6e5b70e9 TM |
953 | atomic_inc(&task->tk_count); |
954 | rpc_execute(task); | |
6e5b70e9 | 955 | out: |
19445b99 | 956 | return task; |
6e5b70e9 | 957 | } |
c970aa85 | 958 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
959 | |
960 | /** | |
961 | * rpc_call_sync - Perform a synchronous RPC call | |
962 | * @clnt: pointer to RPC client | |
963 | * @msg: RPC call parameters | |
964 | * @flags: RPC call flags | |
1da177e4 | 965 | */ |
cbc20059 | 966 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
967 | { |
968 | struct rpc_task *task; | |
84115e1c TM |
969 | struct rpc_task_setup task_setup_data = { |
970 | .rpc_client = clnt, | |
971 | .rpc_message = msg, | |
972 | .callback_ops = &rpc_default_ops, | |
973 | .flags = flags, | |
974 | }; | |
6e5b70e9 | 975 | int status; |
1da177e4 | 976 | |
50d2bdb1 WAA |
977 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
978 | if (flags & RPC_TASK_ASYNC) { | |
979 | rpc_release_calldata(task_setup_data.callback_ops, | |
980 | task_setup_data.callback_data); | |
981 | return -EINVAL; | |
982 | } | |
1da177e4 | 983 | |
c970aa85 | 984 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
985 | if (IS_ERR(task)) |
986 | return PTR_ERR(task); | |
e60859ac | 987 | status = task->tk_status; |
bde8f00c | 988 | rpc_put_task(task); |
1da177e4 LT |
989 | return status; |
990 | } | |
e8914c65 | 991 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 992 | |
6e5b70e9 TM |
993 | /** |
994 | * rpc_call_async - Perform an asynchronous RPC call | |
995 | * @clnt: pointer to RPC client | |
996 | * @msg: RPC call parameters | |
997 | * @flags: RPC call flags | |
65b6e42c | 998 | * @tk_ops: RPC call ops |
6e5b70e9 | 999 | * @data: user call data |
1da177e4 LT |
1000 | */ |
1001 | int | |
cbc20059 | 1002 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 1003 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
1004 | { |
1005 | struct rpc_task *task; | |
84115e1c TM |
1006 | struct rpc_task_setup task_setup_data = { |
1007 | .rpc_client = clnt, | |
1008 | .rpc_message = msg, | |
1009 | .callback_ops = tk_ops, | |
1010 | .callback_data = data, | |
1011 | .flags = flags|RPC_TASK_ASYNC, | |
1012 | }; | |
1da177e4 | 1013 | |
c970aa85 | 1014 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1015 | if (IS_ERR(task)) |
1016 | return PTR_ERR(task); | |
1017 | rpc_put_task(task); | |
1018 | return 0; | |
1da177e4 | 1019 | } |
e8914c65 | 1020 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 1021 | |
9e00abc3 | 1022 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1023 | /** |
1024 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
1025 | * rpc_execute against it | |
7a73fdde | 1026 | * @req: RPC request |
55ae1aab | 1027 | */ |
0f419791 | 1028 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req) |
55ae1aab RL |
1029 | { |
1030 | struct rpc_task *task; | |
1031 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
1032 | struct rpc_task_setup task_setup_data = { | |
0f419791 | 1033 | .callback_ops = &rpc_default_ops, |
3832591e | 1034 | .flags = RPC_TASK_SOFTCONN, |
55ae1aab RL |
1035 | }; |
1036 | ||
1037 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
1038 | /* | |
1039 | * Create an rpc_task to send the data | |
1040 | */ | |
1041 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 1042 | if (IS_ERR(task)) { |
55ae1aab RL |
1043 | xprt_free_bc_request(req); |
1044 | goto out; | |
1045 | } | |
1046 | task->tk_rqstp = req; | |
1047 | ||
1048 | /* | |
1049 | * Set up the xdr_buf length. | |
1050 | * This also indicates that the buffer is XDR encoded already. | |
1051 | */ | |
1052 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
1053 | xbufp->tail[0].iov_len; | |
1054 | ||
1055 | task->tk_action = call_bc_transmit; | |
1056 | atomic_inc(&task->tk_count); | |
9a6478f6 | 1057 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
1058 | rpc_execute(task); |
1059 | ||
1060 | out: | |
1061 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
1062 | return task; | |
1063 | } | |
9e00abc3 | 1064 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1065 | |
77de2c59 TM |
1066 | void |
1067 | rpc_call_start(struct rpc_task *task) | |
1068 | { | |
1069 | task->tk_action = call_start; | |
1070 | } | |
1071 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
1072 | ||
ed39440a CL |
1073 | /** |
1074 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
1075 | * @clnt: RPC client structure | |
1076 | * @buf: target buffer | |
65b6e42c | 1077 | * @bufsize: length of target buffer |
ed39440a CL |
1078 | * |
1079 | * Returns the number of bytes that are actually in the stored address. | |
1080 | */ | |
1081 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
1082 | { | |
1083 | size_t bytes; | |
2446ab60 TM |
1084 | struct rpc_xprt *xprt; |
1085 | ||
1086 | rcu_read_lock(); | |
1087 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 1088 | |
2446ab60 | 1089 | bytes = xprt->addrlen; |
ed39440a CL |
1090 | if (bytes > bufsize) |
1091 | bytes = bufsize; | |
2446ab60 TM |
1092 | memcpy(buf, &xprt->addr, bytes); |
1093 | rcu_read_unlock(); | |
1094 | ||
1095 | return bytes; | |
ed39440a | 1096 | } |
b86acd50 | 1097 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 1098 | |
f425eba4 CL |
1099 | /** |
1100 | * rpc_peeraddr2str - return remote peer address in printable format | |
1101 | * @clnt: RPC client structure | |
1102 | * @format: address format | |
1103 | * | |
2446ab60 TM |
1104 | * NB: the lifetime of the memory referenced by the returned pointer is |
1105 | * the same as the rpc_xprt itself. As long as the caller uses this | |
1106 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 1107 | */ |
b454ae90 CL |
1108 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
1109 | enum rpc_display_format_t format) | |
f425eba4 | 1110 | { |
2446ab60 TM |
1111 | struct rpc_xprt *xprt; |
1112 | ||
1113 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
1114 | |
1115 | if (xprt->address_strings[format] != NULL) | |
1116 | return xprt->address_strings[format]; | |
1117 | else | |
1118 | return "unprintable"; | |
f425eba4 | 1119 | } |
b86acd50 | 1120 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 1121 | |
2e738fdc CL |
1122 | static const struct sockaddr_in rpc_inaddr_loopback = { |
1123 | .sin_family = AF_INET, | |
1124 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1125 | }; | |
1126 | ||
1127 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
1128 | .sin6_family = AF_INET6, | |
1129 | .sin6_addr = IN6ADDR_ANY_INIT, | |
1130 | }; | |
1131 | ||
1132 | /* | |
1133 | * Try a getsockname() on a connected datagram socket. Using a | |
1134 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
1135 | * This conserves the ephemeral port number space. | |
1136 | * | |
1137 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1138 | * negative errno is returned. | |
1139 | */ | |
1140 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
1141 | struct sockaddr *buf, int buflen) | |
1142 | { | |
1143 | struct socket *sock; | |
1144 | int err; | |
1145 | ||
1146 | err = __sock_create(net, sap->sa_family, | |
1147 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1148 | if (err < 0) { | |
1149 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1150 | goto out; | |
1151 | } | |
1152 | ||
1153 | switch (sap->sa_family) { | |
1154 | case AF_INET: | |
1155 | err = kernel_bind(sock, | |
1156 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1157 | sizeof(rpc_inaddr_loopback)); | |
1158 | break; | |
1159 | case AF_INET6: | |
1160 | err = kernel_bind(sock, | |
1161 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1162 | sizeof(rpc_in6addr_loopback)); | |
1163 | break; | |
1164 | default: | |
1165 | err = -EAFNOSUPPORT; | |
1166 | goto out; | |
1167 | } | |
1168 | if (err < 0) { | |
1169 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1170 | goto out_release; | |
1171 | } | |
1172 | ||
1173 | err = kernel_connect(sock, sap, salen, 0); | |
1174 | if (err < 0) { | |
1175 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1176 | goto out_release; | |
1177 | } | |
1178 | ||
1179 | err = kernel_getsockname(sock, buf, &buflen); | |
1180 | if (err < 0) { | |
1181 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1182 | goto out_release; | |
1183 | } | |
1184 | ||
1185 | err = 0; | |
1186 | if (buf->sa_family == AF_INET6) { | |
1187 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1188 | sin6->sin6_scope_id = 0; | |
1189 | } | |
1190 | dprintk("RPC: %s succeeded\n", __func__); | |
1191 | ||
1192 | out_release: | |
1193 | sock_release(sock); | |
1194 | out: | |
1195 | return err; | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Scraping a connected socket failed, so we don't have a useable | |
1200 | * local address. Fallback: generate an address that will prevent | |
1201 | * the server from calling us back. | |
1202 | * | |
1203 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1204 | * negative errno is returned. | |
1205 | */ | |
1206 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1207 | { | |
1208 | switch (family) { | |
1209 | case AF_INET: | |
1210 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1211 | return -EINVAL; | |
1212 | memcpy(buf, &rpc_inaddr_loopback, | |
1213 | sizeof(rpc_inaddr_loopback)); | |
1214 | break; | |
1215 | case AF_INET6: | |
1216 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1217 | return -EINVAL; | |
1218 | memcpy(buf, &rpc_in6addr_loopback, | |
1219 | sizeof(rpc_in6addr_loopback)); | |
1220 | default: | |
1221 | dprintk("RPC: %s: address family not supported\n", | |
1222 | __func__); | |
1223 | return -EAFNOSUPPORT; | |
1224 | } | |
1225 | dprintk("RPC: %s: succeeded\n", __func__); | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | /** | |
1230 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1231 | * @clnt: RPC client structure | |
1232 | * @buf: target buffer | |
1233 | * @buflen: size of target buffer, in bytes | |
1234 | * | |
1235 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1236 | * otherwise, a negative errno is returned. | |
1237 | * | |
1238 | * This works even if the underlying transport is not currently connected, | |
1239 | * or if the upper layer never previously provided a source address. | |
1240 | * | |
1241 | * The result of this function call is transient: multiple calls in | |
1242 | * succession may give different results, depending on how local | |
1243 | * networking configuration changes over time. | |
1244 | */ | |
1245 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1246 | { | |
1247 | struct sockaddr_storage address; | |
1248 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1249 | struct rpc_xprt *xprt; | |
1250 | struct net *net; | |
1251 | size_t salen; | |
1252 | int err; | |
1253 | ||
1254 | rcu_read_lock(); | |
1255 | xprt = rcu_dereference(clnt->cl_xprt); | |
1256 | salen = xprt->addrlen; | |
1257 | memcpy(sap, &xprt->addr, salen); | |
1258 | net = get_net(xprt->xprt_net); | |
1259 | rcu_read_unlock(); | |
1260 | ||
1261 | rpc_set_port(sap, 0); | |
1262 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1263 | put_net(net); | |
1264 | if (err != 0) | |
1265 | /* Couldn't discover local address, return ANYADDR */ | |
1266 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1267 | return 0; | |
1268 | } | |
1269 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1270 | ||
1da177e4 LT |
1271 | void |
1272 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1273 | { | |
2446ab60 TM |
1274 | struct rpc_xprt *xprt; |
1275 | ||
1276 | rcu_read_lock(); | |
1277 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1278 | if (xprt->ops->set_buffer_size) |
1279 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1280 | rcu_read_unlock(); |
1da177e4 | 1281 | } |
e8914c65 | 1282 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1283 | |
2446ab60 TM |
1284 | /** |
1285 | * rpc_protocol - Get transport protocol number for an RPC client | |
1286 | * @clnt: RPC client to query | |
1287 | * | |
1288 | */ | |
1289 | int rpc_protocol(struct rpc_clnt *clnt) | |
1290 | { | |
1291 | int protocol; | |
1292 | ||
1293 | rcu_read_lock(); | |
1294 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1295 | rcu_read_unlock(); | |
1296 | return protocol; | |
1297 | } | |
1298 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1299 | ||
1300 | /** | |
1301 | * rpc_net_ns - Get the network namespace for this RPC client | |
1302 | * @clnt: RPC client to query | |
1303 | * | |
1304 | */ | |
1305 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1306 | { | |
1307 | struct net *ret; | |
1308 | ||
1309 | rcu_read_lock(); | |
1310 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1311 | rcu_read_unlock(); | |
1312 | return ret; | |
1313 | } | |
1314 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1315 | ||
1316 | /** | |
1317 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1318 | * @clnt: RPC client to query | |
1da177e4 LT |
1319 | * |
1320 | * For stream transports, this is one RPC record fragment (see RFC | |
1321 | * 1831), as we don't support multi-record requests yet. For datagram | |
1322 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1323 | * RPC header sizes. | |
1324 | */ | |
1325 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1326 | { | |
2446ab60 TM |
1327 | size_t ret; |
1328 | ||
1329 | rcu_read_lock(); | |
1330 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1331 | rcu_read_unlock(); | |
1332 | return ret; | |
1da177e4 | 1333 | } |
b86acd50 | 1334 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1335 | |
edddbb1e | 1336 | /** |
512e4b29 | 1337 | * rpc_get_timeout - Get timeout for transport in units of HZ |
edddbb1e WAA |
1338 | * @clnt: RPC client to query |
1339 | */ | |
1340 | unsigned long rpc_get_timeout(struct rpc_clnt *clnt) | |
1341 | { | |
1342 | unsigned long ret; | |
1343 | ||
1344 | rcu_read_lock(); | |
1345 | ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval; | |
1346 | rcu_read_unlock(); | |
1347 | return ret; | |
1348 | } | |
1349 | EXPORT_SYMBOL_GPL(rpc_get_timeout); | |
1350 | ||
35f5a422 CL |
1351 | /** |
1352 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1353 | * @clnt: client to rebind | |
1354 | * | |
1355 | */ | |
1356 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1357 | { | |
2446ab60 TM |
1358 | if (clnt->cl_autobind) { |
1359 | rcu_read_lock(); | |
1360 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1361 | rcu_read_unlock(); | |
1362 | } | |
35f5a422 | 1363 | } |
b86acd50 | 1364 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1365 | |
aae2006e AA |
1366 | /* |
1367 | * Restart an (async) RPC call from the call_prepare state. | |
1368 | * Usually called from within the exit handler. | |
1369 | */ | |
f1f88fc7 | 1370 | int |
aae2006e AA |
1371 | rpc_restart_call_prepare(struct rpc_task *task) |
1372 | { | |
1373 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1374 | return 0; |
d00c5d43 | 1375 | task->tk_action = call_start; |
494314c4 | 1376 | task->tk_status = 0; |
d00c5d43 TM |
1377 | if (task->tk_ops->rpc_call_prepare != NULL) |
1378 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1379 | return 1; |
aae2006e AA |
1380 | } |
1381 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1382 | ||
1da177e4 LT |
1383 | /* |
1384 | * Restart an (async) RPC call. Usually called from within the | |
1385 | * exit handler. | |
1386 | */ | |
f1f88fc7 | 1387 | int |
1da177e4 LT |
1388 | rpc_restart_call(struct rpc_task *task) |
1389 | { | |
1390 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1391 | return 0; |
1da177e4 | 1392 | task->tk_action = call_start; |
494314c4 | 1393 | task->tk_status = 0; |
f1f88fc7 | 1394 | return 1; |
1da177e4 | 1395 | } |
e8914c65 | 1396 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1397 | |
f895b252 | 1398 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b4b9d2cc JL |
1399 | const char |
1400 | *rpc_proc_name(const struct rpc_task *task) | |
3748f1e4 CL |
1401 | { |
1402 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1403 | ||
1404 | if (proc) { | |
1405 | if (proc->p_name) | |
1406 | return proc->p_name; | |
1407 | else | |
1408 | return "NULL"; | |
1409 | } else | |
1410 | return "no proc"; | |
1411 | } | |
1412 | #endif | |
1413 | ||
1da177e4 LT |
1414 | /* |
1415 | * 0. Initial state | |
1416 | * | |
1417 | * Other FSM states can be visited zero or more times, but | |
1418 | * this state is visited exactly once for each RPC. | |
1419 | */ | |
1420 | static void | |
1421 | call_start(struct rpc_task *task) | |
1422 | { | |
1423 | struct rpc_clnt *clnt = task->tk_client; | |
1424 | ||
3748f1e4 | 1425 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
55909f21 | 1426 | clnt->cl_program->name, clnt->cl_vers, |
3748f1e4 | 1427 | rpc_proc_name(task), |
46121cf7 | 1428 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1429 | |
1430 | /* Increment call count */ | |
1431 | task->tk_msg.rpc_proc->p_count++; | |
1432 | clnt->cl_stats->rpccnt++; | |
1433 | task->tk_action = call_reserve; | |
1434 | } | |
1435 | ||
1436 | /* | |
1437 | * 1. Reserve an RPC call slot | |
1438 | */ | |
1439 | static void | |
1440 | call_reserve(struct rpc_task *task) | |
1441 | { | |
46121cf7 | 1442 | dprint_status(task); |
1da177e4 | 1443 | |
1da177e4 LT |
1444 | task->tk_status = 0; |
1445 | task->tk_action = call_reserveresult; | |
1446 | xprt_reserve(task); | |
1447 | } | |
1448 | ||
ba60eb25 TM |
1449 | static void call_retry_reserve(struct rpc_task *task); |
1450 | ||
1da177e4 LT |
1451 | /* |
1452 | * 1b. Grok the result of xprt_reserve() | |
1453 | */ | |
1454 | static void | |
1455 | call_reserveresult(struct rpc_task *task) | |
1456 | { | |
1457 | int status = task->tk_status; | |
1458 | ||
46121cf7 | 1459 | dprint_status(task); |
1da177e4 LT |
1460 | |
1461 | /* | |
1462 | * After a call to xprt_reserve(), we must have either | |
1463 | * a request slot or else an error status. | |
1464 | */ | |
1465 | task->tk_status = 0; | |
1466 | if (status >= 0) { | |
1467 | if (task->tk_rqstp) { | |
f2d47d02 | 1468 | task->tk_action = call_refresh; |
1da177e4 LT |
1469 | return; |
1470 | } | |
1471 | ||
1472 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1473 | __func__, status); |
1da177e4 LT |
1474 | rpc_exit(task, -EIO); |
1475 | return; | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * Even though there was an error, we may have acquired | |
1480 | * a request slot somehow. Make sure not to leak it. | |
1481 | */ | |
1482 | if (task->tk_rqstp) { | |
1483 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1484 | __func__, status); |
1da177e4 LT |
1485 | xprt_release(task); |
1486 | } | |
1487 | ||
1488 | switch (status) { | |
1afeaf5c TM |
1489 | case -ENOMEM: |
1490 | rpc_delay(task, HZ >> 2); | |
1da177e4 | 1491 | case -EAGAIN: /* woken up; retry */ |
ba60eb25 | 1492 | task->tk_action = call_retry_reserve; |
1da177e4 LT |
1493 | return; |
1494 | case -EIO: /* probably a shutdown */ | |
1495 | break; | |
1496 | default: | |
1497 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1498 | __func__, status); |
1da177e4 LT |
1499 | break; |
1500 | } | |
1501 | rpc_exit(task, status); | |
1502 | } | |
1503 | ||
ba60eb25 TM |
1504 | /* |
1505 | * 1c. Retry reserving an RPC call slot | |
1506 | */ | |
1507 | static void | |
1508 | call_retry_reserve(struct rpc_task *task) | |
1509 | { | |
1510 | dprint_status(task); | |
1511 | ||
1512 | task->tk_status = 0; | |
1513 | task->tk_action = call_reserveresult; | |
1514 | xprt_retry_reserve(task); | |
1515 | } | |
1516 | ||
1da177e4 | 1517 | /* |
55576244 BF |
1518 | * 2. Bind and/or refresh the credentials |
1519 | */ | |
1520 | static void | |
1521 | call_refresh(struct rpc_task *task) | |
1522 | { | |
1523 | dprint_status(task); | |
1524 | ||
1525 | task->tk_action = call_refreshresult; | |
1526 | task->tk_status = 0; | |
1527 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1528 | rpcauth_refreshcred(task); | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * 2a. Process the results of a credential refresh | |
1533 | */ | |
1534 | static void | |
1535 | call_refreshresult(struct rpc_task *task) | |
1536 | { | |
1537 | int status = task->tk_status; | |
1538 | ||
1539 | dprint_status(task); | |
1540 | ||
1541 | task->tk_status = 0; | |
5fc43978 | 1542 | task->tk_action = call_refresh; |
55576244 | 1543 | switch (status) { |
5fc43978 | 1544 | case 0: |
6ff33b7d | 1545 | if (rpcauth_uptodatecred(task)) { |
5fc43978 | 1546 | task->tk_action = call_allocate; |
6ff33b7d WAA |
1547 | return; |
1548 | } | |
1549 | /* Use rate-limiting and a max number of retries if refresh | |
1550 | * had status 0 but failed to update the cred. | |
1551 | */ | |
55576244 BF |
1552 | case -ETIMEDOUT: |
1553 | rpc_delay(task, 3*HZ); | |
5fc43978 TM |
1554 | case -EAGAIN: |
1555 | status = -EACCES; | |
f1ff0c27 | 1556 | case -EKEYEXPIRED: |
5fc43978 TM |
1557 | if (!task->tk_cred_retry) |
1558 | break; | |
1559 | task->tk_cred_retry--; | |
1560 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1561 | task->tk_pid, __func__); | |
1562 | return; | |
55576244 | 1563 | } |
5fc43978 TM |
1564 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1565 | task->tk_pid, __func__, status); | |
1566 | rpc_exit(task, status); | |
55576244 BF |
1567 | } |
1568 | ||
1569 | /* | |
1570 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1571 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1572 | */ |
1573 | static void | |
1574 | call_allocate(struct rpc_task *task) | |
1575 | { | |
f2d47d02 | 1576 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 | 1577 | struct rpc_rqst *req = task->tk_rqstp; |
a4f0835c | 1578 | struct rpc_xprt *xprt = req->rq_xprt; |
2bea90d4 | 1579 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1580 | |
46121cf7 CL |
1581 | dprint_status(task); |
1582 | ||
2bea90d4 | 1583 | task->tk_status = 0; |
f2d47d02 | 1584 | task->tk_action = call_bind; |
2bea90d4 | 1585 | |
02107148 | 1586 | if (req->rq_buffer) |
1da177e4 LT |
1587 | return; |
1588 | ||
2bea90d4 CL |
1589 | if (proc->p_proc != 0) { |
1590 | BUG_ON(proc->p_arglen == 0); | |
1591 | if (proc->p_decode != NULL) | |
1592 | BUG_ON(proc->p_replen == 0); | |
1593 | } | |
1da177e4 | 1594 | |
2bea90d4 CL |
1595 | /* |
1596 | * Calculate the size (in quads) of the RPC call | |
1597 | * and reply headers, and convert both values | |
1598 | * to byte sizes. | |
1599 | */ | |
1600 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1601 | req->rq_callsize <<= 2; | |
1602 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1603 | req->rq_rcvsize <<= 2; | |
1604 | ||
c5a4dd8b CL |
1605 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1606 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1607 | if (req->rq_buffer != NULL) |
1da177e4 | 1608 | return; |
4a068258 | 1609 | xprt_inject_disconnect(xprt); |
46121cf7 CL |
1610 | |
1611 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1612 | |
5afa9133 | 1613 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1614 | task->tk_action = call_allocate; |
1da177e4 LT |
1615 | rpc_delay(task, HZ>>4); |
1616 | return; | |
1617 | } | |
1618 | ||
1619 | rpc_exit(task, -ERESTARTSYS); | |
1620 | } | |
1621 | ||
940e3318 TM |
1622 | static inline int |
1623 | rpc_task_need_encode(struct rpc_task *task) | |
1624 | { | |
1625 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1626 | } | |
1627 | ||
1628 | static inline void | |
1629 | rpc_task_force_reencode(struct rpc_task *task) | |
1630 | { | |
1631 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1632 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1633 | } |
1634 | ||
2bea90d4 CL |
1635 | static inline void |
1636 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1637 | { | |
1638 | buf->head[0].iov_base = start; | |
1639 | buf->head[0].iov_len = len; | |
1640 | buf->tail[0].iov_len = 0; | |
1641 | buf->page_len = 0; | |
4f22ccc3 | 1642 | buf->flags = 0; |
2bea90d4 CL |
1643 | buf->len = 0; |
1644 | buf->buflen = len; | |
1645 | } | |
1646 | ||
1da177e4 LT |
1647 | /* |
1648 | * 3. Encode arguments of an RPC call | |
1649 | */ | |
1650 | static void | |
b0e1c57e | 1651 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1652 | { |
1da177e4 | 1653 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1654 | kxdreproc_t encode; |
d8ed029d | 1655 | __be32 *p; |
1da177e4 | 1656 | |
46121cf7 | 1657 | dprint_status(task); |
1da177e4 | 1658 | |
2bea90d4 CL |
1659 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1660 | req->rq_buffer, | |
1661 | req->rq_callsize); | |
1662 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1663 | (char *)req->rq_buffer + req->rq_callsize, | |
1664 | req->rq_rcvsize); | |
1da177e4 | 1665 | |
b0e1c57e CL |
1666 | p = rpc_encode_header(task); |
1667 | if (p == NULL) { | |
1668 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1669 | rpc_exit(task, -EIO); |
1670 | return; | |
1671 | } | |
b0e1c57e CL |
1672 | |
1673 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1674 | if (encode == NULL) |
1675 | return; | |
1676 | ||
1677 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1678 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1679 | } |
1680 | ||
1681 | /* | |
1682 | * 4. Get the server port number if not yet set | |
1683 | */ | |
1684 | static void | |
1685 | call_bind(struct rpc_task *task) | |
1686 | { | |
ad2368d6 | 1687 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1688 | |
46121cf7 | 1689 | dprint_status(task); |
1da177e4 | 1690 | |
da351878 | 1691 | task->tk_action = call_connect; |
ec739ef0 | 1692 | if (!xprt_bound(xprt)) { |
da351878 | 1693 | task->tk_action = call_bind_status; |
ec739ef0 | 1694 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1695 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1696 | } |
1697 | } | |
1698 | ||
1699 | /* | |
da351878 CL |
1700 | * 4a. Sort out bind result |
1701 | */ | |
1702 | static void | |
1703 | call_bind_status(struct rpc_task *task) | |
1704 | { | |
906462af | 1705 | int status = -EIO; |
da351878 CL |
1706 | |
1707 | if (task->tk_status >= 0) { | |
46121cf7 | 1708 | dprint_status(task); |
da351878 CL |
1709 | task->tk_status = 0; |
1710 | task->tk_action = call_connect; | |
1711 | return; | |
1712 | } | |
1713 | ||
5753cba1 | 1714 | trace_rpc_bind_status(task); |
da351878 | 1715 | switch (task->tk_status) { |
381ba74a TM |
1716 | case -ENOMEM: |
1717 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1718 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1719 | goto retry_timeout; |
da351878 | 1720 | case -EACCES: |
46121cf7 CL |
1721 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1722 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1723 | /* fail immediately if this is an RPC ping */ |
1724 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1725 | status = -EOPNOTSUPP; | |
1726 | break; | |
1727 | } | |
0b760113 TM |
1728 | if (task->tk_rebind_retry == 0) |
1729 | break; | |
1730 | task->tk_rebind_retry--; | |
ea635a51 | 1731 | rpc_delay(task, 3*HZ); |
da45828e | 1732 | goto retry_timeout; |
da351878 | 1733 | case -ETIMEDOUT: |
46121cf7 | 1734 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1735 | task->tk_pid); |
da45828e | 1736 | goto retry_timeout; |
da351878 | 1737 | case -EPFNOSUPPORT: |
906462af | 1738 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1739 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1740 | task->tk_pid); |
1741 | break; | |
1742 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1743 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1744 | task->tk_pid); |
fdb63dcd | 1745 | goto retry_timeout; |
012da158 CL |
1746 | case -ECONNREFUSED: /* connection problems */ |
1747 | case -ECONNRESET: | |
df277270 | 1748 | case -ECONNABORTED: |
012da158 CL |
1749 | case -ENOTCONN: |
1750 | case -EHOSTDOWN: | |
1751 | case -EHOSTUNREACH: | |
1752 | case -ENETUNREACH: | |
3601c4a9 | 1753 | case -ENOBUFS: |
012da158 CL |
1754 | case -EPIPE: |
1755 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1756 | task->tk_pid, task->tk_status); | |
1757 | if (!RPC_IS_SOFTCONN(task)) { | |
1758 | rpc_delay(task, 5*HZ); | |
1759 | goto retry_timeout; | |
1760 | } | |
1761 | status = task->tk_status; | |
1762 | break; | |
da351878 | 1763 | default: |
46121cf7 | 1764 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1765 | task->tk_pid, -task->tk_status); |
da351878 CL |
1766 | } |
1767 | ||
1768 | rpc_exit(task, status); | |
1769 | return; | |
1770 | ||
da45828e | 1771 | retry_timeout: |
fdb63dcd | 1772 | task->tk_status = 0; |
da45828e | 1773 | task->tk_action = call_timeout; |
da351878 CL |
1774 | } |
1775 | ||
1776 | /* | |
1777 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1778 | */ |
1779 | static void | |
1780 | call_connect(struct rpc_task *task) | |
1781 | { | |
ad2368d6 | 1782 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1783 | |
46121cf7 | 1784 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1785 | task->tk_pid, xprt, |
1786 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1787 | |
da351878 CL |
1788 | task->tk_action = call_transmit; |
1789 | if (!xprt_connected(xprt)) { | |
1790 | task->tk_action = call_connect_status; | |
1791 | if (task->tk_status < 0) | |
1792 | return; | |
786615bc TM |
1793 | if (task->tk_flags & RPC_TASK_NOCONNECT) { |
1794 | rpc_exit(task, -ENOTCONN); | |
1795 | return; | |
1796 | } | |
da351878 | 1797 | xprt_connect(task); |
1da177e4 | 1798 | } |
1da177e4 LT |
1799 | } |
1800 | ||
1801 | /* | |
da351878 | 1802 | * 4c. Sort out connect result |
1da177e4 LT |
1803 | */ |
1804 | static void | |
1805 | call_connect_status(struct rpc_task *task) | |
1806 | { | |
1807 | struct rpc_clnt *clnt = task->tk_client; | |
1808 | int status = task->tk_status; | |
1809 | ||
46121cf7 | 1810 | dprint_status(task); |
da351878 | 1811 | |
5753cba1 | 1812 | trace_rpc_connect_status(task, status); |
561ec160 | 1813 | task->tk_status = 0; |
1da177e4 | 1814 | switch (status) { |
3ed5e2a2 TM |
1815 | case -ECONNREFUSED: |
1816 | case -ECONNRESET: | |
df277270 | 1817 | case -ECONNABORTED: |
3ed5e2a2 | 1818 | case -ENETUNREACH: |
df277270 | 1819 | case -EHOSTUNREACH: |
3913c78c | 1820 | case -EADDRINUSE: |
3601c4a9 | 1821 | case -ENOBUFS: |
2fc193cf | 1822 | case -EPIPE: |
3ed5e2a2 TM |
1823 | if (RPC_IS_SOFTCONN(task)) |
1824 | break; | |
1fa3e2eb SD |
1825 | /* retry with existing socket, after a delay */ |
1826 | rpc_delay(task, 3*HZ); | |
3ed5e2a2 | 1827 | case -EAGAIN: |
485f2251 TM |
1828 | /* Check for timeouts before looping back to call_bind */ |
1829 | case -ETIMEDOUT: | |
1830 | task->tk_action = call_timeout; | |
561ec160 TM |
1831 | return; |
1832 | case 0: | |
3ed5e2a2 TM |
1833 | clnt->cl_stats->netreconn++; |
1834 | task->tk_action = call_transmit; | |
1835 | return; | |
1da177e4 | 1836 | } |
3ed5e2a2 | 1837 | rpc_exit(task, status); |
1da177e4 LT |
1838 | } |
1839 | ||
1840 | /* | |
1841 | * 5. Transmit the RPC request, and wait for reply | |
1842 | */ | |
1843 | static void | |
1844 | call_transmit(struct rpc_task *task) | |
1845 | { | |
ca7f33aa TM |
1846 | int is_retrans = RPC_WAS_SENT(task); |
1847 | ||
46121cf7 | 1848 | dprint_status(task); |
1da177e4 LT |
1849 | |
1850 | task->tk_action = call_status; | |
1851 | if (task->tk_status < 0) | |
1852 | return; | |
90051ea7 | 1853 | if (!xprt_prepare_transmit(task)) |
1da177e4 | 1854 | return; |
e0ab53de | 1855 | task->tk_action = call_transmit_status; |
1da177e4 | 1856 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1857 | if (rpc_task_need_encode(task)) { |
b0e1c57e | 1858 | rpc_xdr_encode(task); |
5e5ce5be | 1859 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1860 | if (task->tk_status != 0) { |
1861 | /* Was the error nonfatal? */ | |
1862 | if (task->tk_status == -EAGAIN) | |
1863 | rpc_delay(task, HZ >> 4); | |
1864 | else | |
1865 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1866 | return; |
8b39f2b4 | 1867 | } |
5e5ce5be | 1868 | } |
1da177e4 LT |
1869 | xprt_transmit(task); |
1870 | if (task->tk_status < 0) | |
1871 | return; | |
ca7f33aa TM |
1872 | if (is_retrans) |
1873 | task->tk_client->cl_stats->rpcretrans++; | |
e0ab53de TM |
1874 | /* |
1875 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1876 | * in order to allow access to the socket to other RPC requests. | |
1877 | */ | |
1878 | call_transmit_status(task); | |
55ae1aab | 1879 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1880 | return; |
1881 | task->tk_action = rpc_exit_task; | |
a4f0835c | 1882 | rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task); |
e0ab53de TM |
1883 | } |
1884 | ||
1885 | /* | |
1886 | * 5a. Handle cleanup after a transmission | |
1887 | */ | |
1888 | static void | |
1889 | call_transmit_status(struct rpc_task *task) | |
1890 | { | |
1891 | task->tk_action = call_status; | |
206a134b CL |
1892 | |
1893 | /* | |
1894 | * Common case: success. Force the compiler to put this | |
1895 | * test first. | |
1896 | */ | |
1897 | if (task->tk_status == 0) { | |
1898 | xprt_end_transmit(task); | |
1899 | rpc_task_force_reencode(task); | |
1900 | return; | |
1901 | } | |
1902 | ||
15f081ca TM |
1903 | switch (task->tk_status) { |
1904 | case -EAGAIN: | |
1905 | break; | |
1906 | default: | |
206a134b | 1907 | dprint_status(task); |
15f081ca | 1908 | xprt_end_transmit(task); |
09a21c41 CL |
1909 | rpc_task_force_reencode(task); |
1910 | break; | |
15f081ca TM |
1911 | /* |
1912 | * Special cases: if we've been waiting on the | |
1913 | * socket's write_space() callback, or if the | |
1914 | * socket just returned a connection error, | |
1915 | * then hold onto the transport lock. | |
1916 | */ | |
1917 | case -ECONNREFUSED: | |
15f081ca TM |
1918 | case -EHOSTDOWN: |
1919 | case -EHOSTUNREACH: | |
1920 | case -ENETUNREACH: | |
3dedbb5c | 1921 | case -EPERM: |
09a21c41 CL |
1922 | if (RPC_IS_SOFTCONN(task)) { |
1923 | xprt_end_transmit(task); | |
1924 | rpc_exit(task, task->tk_status); | |
1925 | break; | |
1926 | } | |
1927 | case -ECONNRESET: | |
df277270 | 1928 | case -ECONNABORTED: |
3913c78c | 1929 | case -EADDRINUSE: |
09a21c41 | 1930 | case -ENOTCONN: |
3601c4a9 | 1931 | case -ENOBUFS: |
c8485e4d | 1932 | case -EPIPE: |
15f081ca TM |
1933 | rpc_task_force_reencode(task); |
1934 | } | |
1da177e4 LT |
1935 | } |
1936 | ||
9e00abc3 | 1937 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1938 | /* |
1939 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1940 | * addition, disconnect on connectivity errors. | |
1941 | */ | |
1942 | static void | |
1943 | call_bc_transmit(struct rpc_task *task) | |
1944 | { | |
1945 | struct rpc_rqst *req = task->tk_rqstp; | |
1946 | ||
1193d58f TM |
1947 | if (!xprt_prepare_transmit(task)) |
1948 | goto out_retry; | |
55ae1aab | 1949 | |
55ae1aab RL |
1950 | if (task->tk_status < 0) { |
1951 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1952 | "error: %d\n", task->tk_status); | |
1193d58f | 1953 | goto out_done; |
55ae1aab | 1954 | } |
1193d58f TM |
1955 | if (req->rq_connect_cookie != req->rq_xprt->connect_cookie) |
1956 | req->rq_bytes_sent = 0; | |
55ae1aab RL |
1957 | |
1958 | xprt_transmit(task); | |
1193d58f TM |
1959 | |
1960 | if (task->tk_status == -EAGAIN) | |
1961 | goto out_nospace; | |
1962 | ||
55ae1aab RL |
1963 | xprt_end_transmit(task); |
1964 | dprint_status(task); | |
1965 | switch (task->tk_status) { | |
1966 | case 0: | |
1967 | /* Success */ | |
55ae1aab RL |
1968 | case -EHOSTDOWN: |
1969 | case -EHOSTUNREACH: | |
1970 | case -ENETUNREACH: | |
3832591e TM |
1971 | case -ECONNRESET: |
1972 | case -ECONNREFUSED: | |
1973 | case -EADDRINUSE: | |
1974 | case -ENOTCONN: | |
1975 | case -EPIPE: | |
1976 | break; | |
55ae1aab RL |
1977 | case -ETIMEDOUT: |
1978 | /* | |
1979 | * Problem reaching the server. Disconnect and let the | |
1980 | * forechannel reestablish the connection. The server will | |
1981 | * have to retransmit the backchannel request and we'll | |
1982 | * reprocess it. Since these ops are idempotent, there's no | |
1983 | * need to cache our reply at this time. | |
1984 | */ | |
1985 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1986 | "error: %d\n", task->tk_status); | |
a4f0835c | 1987 | xprt_conditional_disconnect(req->rq_xprt, |
55ae1aab RL |
1988 | req->rq_connect_cookie); |
1989 | break; | |
1990 | default: | |
1991 | /* | |
1992 | * We were unable to reply and will have to drop the | |
1993 | * request. The server should reconnect and retransmit. | |
1994 | */ | |
1facf4c4 | 1995 | WARN_ON_ONCE(task->tk_status == -EAGAIN); |
55ae1aab RL |
1996 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1997 | "error: %d\n", task->tk_status); | |
1998 | break; | |
1999 | } | |
2000 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1193d58f TM |
2001 | out_done: |
2002 | task->tk_action = rpc_exit_task; | |
2003 | return; | |
2004 | out_nospace: | |
2005 | req->rq_connect_cookie = req->rq_xprt->connect_cookie; | |
2006 | out_retry: | |
2007 | task->tk_status = 0; | |
55ae1aab | 2008 | } |
9e00abc3 | 2009 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 2010 | |
1da177e4 LT |
2011 | /* |
2012 | * 6. Sort out the RPC call status | |
2013 | */ | |
2014 | static void | |
2015 | call_status(struct rpc_task *task) | |
2016 | { | |
2017 | struct rpc_clnt *clnt = task->tk_client; | |
2018 | struct rpc_rqst *req = task->tk_rqstp; | |
2019 | int status; | |
2020 | ||
dd2b63d0 RL |
2021 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
2022 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 2023 | |
46121cf7 | 2024 | dprint_status(task); |
1da177e4 LT |
2025 | |
2026 | status = task->tk_status; | |
2027 | if (status >= 0) { | |
2028 | task->tk_action = call_decode; | |
2029 | return; | |
2030 | } | |
2031 | ||
5753cba1 | 2032 | trace_rpc_call_status(task); |
1da177e4 LT |
2033 | task->tk_status = 0; |
2034 | switch(status) { | |
76303992 TM |
2035 | case -EHOSTDOWN: |
2036 | case -EHOSTUNREACH: | |
2037 | case -ENETUNREACH: | |
3dedbb5c | 2038 | case -EPERM: |
9455e3f4 TM |
2039 | if (RPC_IS_SOFTCONN(task)) { |
2040 | rpc_exit(task, status); | |
2041 | break; | |
2042 | } | |
76303992 TM |
2043 | /* |
2044 | * Delay any retries for 3 seconds, then handle as if it | |
2045 | * were a timeout. | |
2046 | */ | |
2047 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
2048 | case -ETIMEDOUT: |
2049 | task->tk_action = call_timeout; | |
8a19a0b6 TM |
2050 | if (!(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) |
2051 | && task->tk_client->cl_discrtry) | |
a4f0835c | 2052 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2053 | req->rq_connect_cookie); |
1da177e4 LT |
2054 | break; |
2055 | case -ECONNREFUSED: | |
df277270 TM |
2056 | case -ECONNRESET: |
2057 | case -ECONNABORTED: | |
35f5a422 | 2058 | rpc_force_rebind(clnt); |
3913c78c | 2059 | case -EADDRINUSE: |
3601c4a9 | 2060 | case -ENOBUFS: |
c8485e4d TM |
2061 | rpc_delay(task, 3*HZ); |
2062 | case -EPIPE: | |
2063 | case -ENOTCONN: | |
1da177e4 LT |
2064 | task->tk_action = call_bind; |
2065 | break; | |
2066 | case -EAGAIN: | |
2067 | task->tk_action = call_transmit; | |
2068 | break; | |
2069 | case -EIO: | |
2070 | /* shutdown or soft timeout */ | |
2071 | rpc_exit(task, status); | |
2072 | break; | |
2073 | default: | |
b6b6152c OK |
2074 | if (clnt->cl_chatty) |
2075 | printk("%s: RPC call returned error %d\n", | |
55909f21 | 2076 | clnt->cl_program->name, -status); |
1da177e4 | 2077 | rpc_exit(task, status); |
1da177e4 LT |
2078 | } |
2079 | } | |
2080 | ||
2081 | /* | |
e0ab53de | 2082 | * 6a. Handle RPC timeout |
1da177e4 LT |
2083 | * We do not release the request slot, so we keep using the |
2084 | * same XID for all retransmits. | |
2085 | */ | |
2086 | static void | |
2087 | call_timeout(struct rpc_task *task) | |
2088 | { | |
2089 | struct rpc_clnt *clnt = task->tk_client; | |
2090 | ||
2091 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 2092 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
2093 | goto retry; |
2094 | } | |
2095 | ||
46121cf7 | 2096 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
2097 | task->tk_timeouts++; |
2098 | ||
3a28becc CL |
2099 | if (RPC_IS_SOFTCONN(task)) { |
2100 | rpc_exit(task, -ETIMEDOUT); | |
2101 | return; | |
2102 | } | |
1da177e4 | 2103 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 2104 | if (clnt->cl_chatty) { |
4e0038b6 | 2105 | rcu_read_lock(); |
b6b6152c | 2106 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
55909f21 | 2107 | clnt->cl_program->name, |
4e0038b6 TM |
2108 | rcu_dereference(clnt->cl_xprt)->servername); |
2109 | rcu_read_unlock(); | |
cac5d07e | 2110 | } |
7494d00c TM |
2111 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
2112 | rpc_exit(task, -ETIMEDOUT); | |
2113 | else | |
2114 | rpc_exit(task, -EIO); | |
1da177e4 LT |
2115 | return; |
2116 | } | |
2117 | ||
f518e35a | 2118 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 2119 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
2120 | if (clnt->cl_chatty) { |
2121 | rcu_read_lock(); | |
b6b6152c | 2122 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
55909f21 | 2123 | clnt->cl_program->name, |
4e0038b6 TM |
2124 | rcu_dereference(clnt->cl_xprt)->servername); |
2125 | rcu_read_unlock(); | |
2126 | } | |
1da177e4 | 2127 | } |
35f5a422 | 2128 | rpc_force_rebind(clnt); |
b48633bd TM |
2129 | /* |
2130 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
2131 | * event? RFC2203 requires the server to drop all such requests. | |
2132 | */ | |
2133 | rpcauth_invalcred(task); | |
1da177e4 LT |
2134 | |
2135 | retry: | |
1da177e4 LT |
2136 | task->tk_action = call_bind; |
2137 | task->tk_status = 0; | |
2138 | } | |
2139 | ||
2140 | /* | |
2141 | * 7. Decode the RPC reply | |
2142 | */ | |
2143 | static void | |
2144 | call_decode(struct rpc_task *task) | |
2145 | { | |
2146 | struct rpc_clnt *clnt = task->tk_client; | |
2147 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 2148 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 2149 | __be32 *p; |
1da177e4 | 2150 | |
726fd6ad | 2151 | dprint_status(task); |
1da177e4 | 2152 | |
f518e35a | 2153 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
2154 | if (clnt->cl_chatty) { |
2155 | rcu_read_lock(); | |
b6b6152c | 2156 | printk(KERN_NOTICE "%s: server %s OK\n", |
55909f21 | 2157 | clnt->cl_program->name, |
4e0038b6 TM |
2158 | rcu_dereference(clnt->cl_xprt)->servername); |
2159 | rcu_read_unlock(); | |
2160 | } | |
1da177e4 LT |
2161 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
2162 | } | |
2163 | ||
43ac3f29 TM |
2164 | /* |
2165 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 2166 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
2167 | */ |
2168 | smp_rmb(); | |
1da177e4 LT |
2169 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
2170 | ||
2171 | /* Check that the softirq receive buffer is valid */ | |
2172 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
2173 | sizeof(req->rq_rcv_buf)) != 0); | |
2174 | ||
1e799b67 TM |
2175 | if (req->rq_rcv_buf.len < 12) { |
2176 | if (!RPC_IS_SOFT(task)) { | |
2177 | task->tk_action = call_bind; | |
1e799b67 TM |
2178 | goto out_retry; |
2179 | } | |
2180 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
55909f21 | 2181 | clnt->cl_program->name, task->tk_status); |
1e799b67 TM |
2182 | task->tk_action = call_timeout; |
2183 | goto out_retry; | |
2184 | } | |
2185 | ||
b0e1c57e | 2186 | p = rpc_verify_header(task); |
abbcf28f TM |
2187 | if (IS_ERR(p)) { |
2188 | if (p == ERR_PTR(-EAGAIN)) | |
2189 | goto out_retry; | |
2190 | return; | |
1da177e4 LT |
2191 | } |
2192 | ||
abbcf28f | 2193 | task->tk_action = rpc_exit_task; |
1da177e4 | 2194 | |
6d5fcb5a | 2195 | if (decode) { |
1da177e4 LT |
2196 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
2197 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 2198 | } |
46121cf7 CL |
2199 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
2200 | task->tk_status); | |
1da177e4 LT |
2201 | return; |
2202 | out_retry: | |
1da177e4 | 2203 | task->tk_status = 0; |
b0e1c57e | 2204 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 2205 | if (task->tk_rqstp == req) { |
dd2b63d0 | 2206 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 2207 | if (task->tk_client->cl_discrtry) |
a4f0835c | 2208 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2209 | req->rq_connect_cookie); |
24b74bf0 | 2210 | } |
1da177e4 LT |
2211 | } |
2212 | ||
d8ed029d | 2213 | static __be32 * |
b0e1c57e | 2214 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
2215 | { |
2216 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2217 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 2218 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
2219 | |
2220 | /* FIXME: check buffer size? */ | |
808012fb | 2221 | |
a4f0835c | 2222 | p = xprt_skip_transport_header(req->rq_xprt, p); |
1da177e4 LT |
2223 | *p++ = req->rq_xid; /* XID */ |
2224 | *p++ = htonl(RPC_CALL); /* CALL */ | |
2225 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
2226 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
2227 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
2228 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
2229 | p = rpcauth_marshcred(task, p); |
2230 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
2231 | return p; | |
1da177e4 LT |
2232 | } |
2233 | ||
d8ed029d | 2234 | static __be32 * |
b0e1c57e | 2235 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 2236 | { |
4e0038b6 | 2237 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
2238 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
2239 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
2240 | __be32 *p = iov->iov_base; |
2241 | u32 n; | |
1da177e4 LT |
2242 | int error = -EACCES; |
2243 | ||
e8896495 DH |
2244 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
2245 | /* RFC-1014 says that the representation of XDR data must be a | |
2246 | * multiple of four bytes | |
2247 | * - if it isn't pointer subtraction in the NFS client may give | |
2248 | * undefined results | |
2249 | */ | |
8a702bbb | 2250 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2251 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2252 | task->tk_rqstp->rq_rcv_buf.len); |
35fa5f7b AA |
2253 | error = -EIO; |
2254 | goto out_err; | |
e8896495 | 2255 | } |
1da177e4 LT |
2256 | if ((len -= 3) < 0) |
2257 | goto out_overflow; | |
1da177e4 | 2258 | |
f4a2e418 | 2259 | p += 1; /* skip XID */ |
1da177e4 | 2260 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2261 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2262 | task->tk_pid, __func__, n); |
35fa5f7b | 2263 | error = -EIO; |
abbcf28f | 2264 | goto out_garbage; |
1da177e4 | 2265 | } |
f4a2e418 | 2266 | |
1da177e4 LT |
2267 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2268 | if (--len < 0) | |
2269 | goto out_overflow; | |
2270 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2271 | case RPC_AUTH_ERROR: |
2272 | break; | |
2273 | case RPC_MISMATCH: | |
2274 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2275 | task->tk_pid, __func__); | |
2276 | error = -EPROTONOSUPPORT; | |
2277 | goto out_err; | |
2278 | default: | |
2279 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2280 | "unknown error: %x\n", | |
2281 | task->tk_pid, __func__, n); | |
35fa5f7b AA |
2282 | error = -EIO; |
2283 | goto out_err; | |
1da177e4 LT |
2284 | } |
2285 | if (--len < 0) | |
2286 | goto out_overflow; | |
2287 | switch ((n = ntohl(*p++))) { | |
2288 | case RPC_AUTH_REJECTEDCRED: | |
2289 | case RPC_AUTH_REJECTEDVERF: | |
2290 | case RPCSEC_GSS_CREDPROBLEM: | |
2291 | case RPCSEC_GSS_CTXPROBLEM: | |
2292 | if (!task->tk_cred_retry) | |
2293 | break; | |
2294 | task->tk_cred_retry--; | |
46121cf7 | 2295 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2296 | task->tk_pid, __func__); |
1da177e4 | 2297 | rpcauth_invalcred(task); |
220bcc2a TM |
2298 | /* Ensure we obtain a new XID! */ |
2299 | xprt_release(task); | |
118df3d1 | 2300 | task->tk_action = call_reserve; |
abbcf28f | 2301 | goto out_retry; |
1da177e4 LT |
2302 | case RPC_AUTH_BADCRED: |
2303 | case RPC_AUTH_BADVERF: | |
2304 | /* possibly garbled cred/verf? */ | |
2305 | if (!task->tk_garb_retry) | |
2306 | break; | |
2307 | task->tk_garb_retry--; | |
46121cf7 | 2308 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2309 | task->tk_pid, __func__); |
1da177e4 | 2310 | task->tk_action = call_bind; |
abbcf28f | 2311 | goto out_retry; |
1da177e4 | 2312 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2313 | rcu_read_lock(); |
b0e1c57e | 2314 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2315 | "authentication.\n", |
2316 | rcu_dereference(clnt->cl_xprt)->servername); | |
2317 | rcu_read_unlock(); | |
1da177e4 LT |
2318 | break; |
2319 | default: | |
8a702bbb | 2320 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2321 | task->tk_pid, __func__, n); |
1da177e4 LT |
2322 | error = -EIO; |
2323 | } | |
46121cf7 | 2324 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2325 | task->tk_pid, __func__, n); |
1da177e4 LT |
2326 | goto out_err; |
2327 | } | |
35fa5f7b AA |
2328 | p = rpcauth_checkverf(task, p); |
2329 | if (IS_ERR(p)) { | |
2330 | error = PTR_ERR(p); | |
2331 | dprintk("RPC: %5u %s: auth check failed with %d\n", | |
2332 | task->tk_pid, __func__, error); | |
abbcf28f | 2333 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2334 | } |
d8ed029d | 2335 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2336 | if (len < 0) |
2337 | goto out_overflow; | |
2338 | switch ((n = ntohl(*p++))) { | |
2339 | case RPC_SUCCESS: | |
2340 | return p; | |
2341 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2342 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2343 | "by server %s\n", task->tk_pid, __func__, | |
2344 | (unsigned int)clnt->cl_prog, | |
2345 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2346 | error = -EPFNOSUPPORT; |
2347 | goto out_err; | |
1da177e4 | 2348 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2349 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2350 | "by server %s\n", task->tk_pid, __func__, | |
2351 | (unsigned int)clnt->cl_prog, | |
2352 | (unsigned int)clnt->cl_vers, | |
2353 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2354 | error = -EPROTONOSUPPORT; |
2355 | goto out_err; | |
1da177e4 | 2356 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2357 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2358 | "version %u on server %s\n", |
0dc47877 | 2359 | task->tk_pid, __func__, |
3748f1e4 | 2360 | rpc_proc_name(task), |
4e0038b6 TM |
2361 | clnt->cl_prog, clnt->cl_vers, |
2362 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2363 | error = -EOPNOTSUPP; |
2364 | goto out_err; | |
1da177e4 | 2365 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2366 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2367 | task->tk_pid, __func__); |
1da177e4 LT |
2368 | break; /* retry */ |
2369 | default: | |
8a702bbb | 2370 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2371 | task->tk_pid, __func__, n); |
1da177e4 LT |
2372 | /* Also retry */ |
2373 | } | |
2374 | ||
abbcf28f | 2375 | out_garbage: |
4e0038b6 | 2376 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2377 | if (task->tk_garb_retry) { |
2378 | task->tk_garb_retry--; | |
46121cf7 | 2379 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2380 | task->tk_pid, __func__); |
1da177e4 | 2381 | task->tk_action = call_bind; |
abbcf28f TM |
2382 | out_retry: |
2383 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2384 | } |
1da177e4 LT |
2385 | out_err: |
2386 | rpc_exit(task, error); | |
8a702bbb | 2387 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2388 | __func__, error); |
abbcf28f | 2389 | return ERR_PTR(error); |
1da177e4 | 2390 | out_overflow: |
8a702bbb | 2391 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2392 | __func__); |
abbcf28f | 2393 | goto out_garbage; |
1da177e4 | 2394 | } |
5ee0ed7d | 2395 | |
9f06c719 | 2396 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2397 | { |
5ee0ed7d TM |
2398 | } |
2399 | ||
bf269551 | 2400 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2401 | { |
2402 | return 0; | |
2403 | } | |
2404 | ||
2405 | static struct rpc_procinfo rpcproc_null = { | |
2406 | .p_encode = rpcproc_encode_null, | |
2407 | .p_decode = rpcproc_decode_null, | |
2408 | }; | |
2409 | ||
caabea8a | 2410 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2411 | { |
2412 | struct rpc_message msg = { | |
2413 | .rpc_proc = &rpcproc_null, | |
2414 | }; | |
2415 | int err; | |
2416 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2417 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2418 | put_rpccred(msg.rpc_cred); |
2419 | return err; | |
2420 | } | |
188fef11 | 2421 | |
5e1550d6 TM |
2422 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2423 | { | |
2424 | struct rpc_message msg = { | |
2425 | .rpc_proc = &rpcproc_null, | |
2426 | .rpc_cred = cred, | |
2427 | }; | |
84115e1c TM |
2428 | struct rpc_task_setup task_setup_data = { |
2429 | .rpc_client = clnt, | |
2430 | .rpc_message = &msg, | |
2431 | .callback_ops = &rpc_default_ops, | |
2432 | .flags = flags, | |
2433 | }; | |
c970aa85 | 2434 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2435 | } |
e8914c65 | 2436 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2437 | |
f895b252 | 2438 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
68a23ee9 CL |
2439 | static void rpc_show_header(void) |
2440 | { | |
cb3997b5 CL |
2441 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2442 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2443 | } |
2444 | ||
38e886e0 CL |
2445 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2446 | const struct rpc_task *task) | |
2447 | { | |
2448 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2449 | |
2450 | if (RPC_IS_QUEUED(task)) | |
2451 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2452 | ||
b3bcedad | 2453 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2454 | task->tk_pid, task->tk_flags, task->tk_status, |
2455 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
55909f21 | 2456 | clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), |
b3bcedad | 2457 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2458 | } |
2459 | ||
70abc49b | 2460 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2461 | { |
2462 | struct rpc_clnt *clnt; | |
38e886e0 | 2463 | struct rpc_task *task; |
68a23ee9 | 2464 | int header = 0; |
70abc49b | 2465 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2466 | |
70abc49b SK |
2467 | spin_lock(&sn->rpc_client_lock); |
2468 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2469 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2470 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2471 | if (!header) { |
2472 | rpc_show_header(); | |
2473 | header++; | |
2474 | } | |
38e886e0 | 2475 | rpc_show_task(clnt, task); |
188fef11 TM |
2476 | } |
2477 | spin_unlock(&clnt->cl_lock); | |
2478 | } | |
70abc49b | 2479 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2480 | } |
2481 | #endif | |
3c87ef6e JL |
2482 | |
2483 | #if IS_ENABLED(CONFIG_SUNRPC_SWAP) | |
2484 | int | |
2485 | rpc_clnt_swap_activate(struct rpc_clnt *clnt) | |
2486 | { | |
2487 | int ret = 0; | |
2488 | struct rpc_xprt *xprt; | |
2489 | ||
2490 | if (atomic_inc_return(&clnt->cl_swapper) == 1) { | |
2491 | retry: | |
2492 | rcu_read_lock(); | |
2493 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
2494 | rcu_read_unlock(); | |
2495 | if (!xprt) { | |
2496 | /* | |
2497 | * If we didn't get a reference, then we likely are | |
2498 | * racing with a migration event. Wait for a grace | |
2499 | * period and try again. | |
2500 | */ | |
2501 | synchronize_rcu(); | |
2502 | goto retry; | |
2503 | } | |
2504 | ||
d67fa4d8 | 2505 | ret = xprt_enable_swap(xprt); |
3c87ef6e JL |
2506 | xprt_put(xprt); |
2507 | } | |
2508 | return ret; | |
2509 | } | |
2510 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate); | |
2511 | ||
2512 | void | |
2513 | rpc_clnt_swap_deactivate(struct rpc_clnt *clnt) | |
2514 | { | |
2515 | struct rpc_xprt *xprt; | |
2516 | ||
2517 | if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) { | |
2518 | retry: | |
2519 | rcu_read_lock(); | |
2520 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
2521 | rcu_read_unlock(); | |
2522 | if (!xprt) { | |
2523 | /* | |
2524 | * If we didn't get a reference, then we likely are | |
2525 | * racing with a migration event. Wait for a grace | |
2526 | * period and try again. | |
2527 | */ | |
2528 | synchronize_rcu(); | |
2529 | goto retry; | |
2530 | } | |
2531 | ||
d67fa4d8 | 2532 | xprt_disable_swap(xprt); |
3c87ef6e JL |
2533 | xprt_put(xprt); |
2534 | } | |
2535 | } | |
2536 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate); | |
2537 | #endif /* CONFIG_SUNRPC_SWAP */ |