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 | 356 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, |
ad01b2c6 | 357 | struct rpc_xprt_switch *xps, |
280ebcf9 TM |
358 | struct rpc_xprt *xprt, |
359 | struct rpc_clnt *parent) | |
1da177e4 | 360 | { |
a613fa16 TM |
361 | const struct rpc_program *program = args->program; |
362 | const struct rpc_version *version; | |
40b00b6b TM |
363 | struct rpc_clnt *clnt = NULL; |
364 | const struct rpc_timeout *timeout; | |
03a9a42a | 365 | const char *nodename = args->nodename; |
1da177e4 | 366 | int err; |
06b8d255 CL |
367 | |
368 | /* sanity check the name before trying to print it */ | |
46121cf7 | 369 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 370 | program->name, args->servername, xprt); |
1da177e4 | 371 | |
4ada539e TM |
372 | err = rpciod_up(); |
373 | if (err) | |
374 | goto out_no_rpciod; | |
698b6d08 | 375 | |
f05c124a | 376 | err = -EINVAL; |
698b6d08 TM |
377 | if (args->version >= program->nrvers) |
378 | goto out_err; | |
379 | version = program->version[args->version]; | |
380 | if (version == NULL) | |
1da177e4 LT |
381 | goto out_err; |
382 | ||
383 | err = -ENOMEM; | |
0da974f4 | 384 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
385 | if (!clnt) |
386 | goto out_err; | |
280ebcf9 | 387 | clnt->cl_parent = parent ? : clnt; |
1da177e4 | 388 | |
2f048db4 TM |
389 | err = rpc_alloc_clid(clnt); |
390 | if (err) | |
391 | goto out_no_clid; | |
1da177e4 | 392 | |
1da177e4 LT |
393 | clnt->cl_procinfo = version->procs; |
394 | clnt->cl_maxproc = version->nrprocs; | |
d5b337b4 | 395 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 396 | clnt->cl_vers = version->number; |
1da177e4 | 397 | clnt->cl_stats = program->stats; |
11c556b3 | 398 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
6739ffb7 | 399 | rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); |
23bf85ba TM |
400 | err = -ENOMEM; |
401 | if (clnt->cl_metrics == NULL) | |
402 | goto out_no_stats; | |
3e32a5d9 | 403 | clnt->cl_program = program; |
6529eba0 | 404 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 405 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 406 | |
40b00b6b | 407 | timeout = xprt->timeout; |
ba7392bb TM |
408 | if (args->timeout != NULL) { |
409 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
410 | sizeof(clnt->cl_timeout_default)); | |
40b00b6b | 411 | timeout = &clnt->cl_timeout_default; |
ba7392bb TM |
412 | } |
413 | ||
40b00b6b | 414 | rpc_clnt_set_transport(clnt, xprt, timeout); |
ad01b2c6 TM |
415 | xprt_iter_init(&clnt->cl_xpi, xps); |
416 | xprt_switch_put(xps); | |
40b00b6b | 417 | |
1da177e4 | 418 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 419 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
1da177e4 | 420 | |
006abe88 | 421 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 422 | |
03a9a42a TM |
423 | if (nodename == NULL) |
424 | nodename = utsname()->nodename; | |
1da177e4 | 425 | /* save the nodename */ |
03a9a42a | 426 | rpc_clnt_set_nodename(clnt, nodename); |
e73f4cc0 | 427 | |
d746e545 | 428 | err = rpc_client_register(clnt, args->authflavor, args->client_name); |
e73f4cc0 SK |
429 | if (err) |
430 | goto out_no_path; | |
280ebcf9 TM |
431 | if (parent) |
432 | atomic_inc(&parent->cl_count); | |
1da177e4 LT |
433 | return clnt; |
434 | ||
1da177e4 | 435 | out_no_path: |
23bf85ba TM |
436 | rpc_free_iostats(clnt->cl_metrics); |
437 | out_no_stats: | |
2f048db4 TM |
438 | rpc_free_clid(clnt); |
439 | out_no_clid: | |
1da177e4 LT |
440 | kfree(clnt); |
441 | out_err: | |
4ada539e TM |
442 | rpciod_down(); |
443 | out_no_rpciod: | |
ad01b2c6 | 444 | xprt_switch_put(xps); |
f05c124a | 445 | xprt_put(xprt); |
1da177e4 LT |
446 | return ERR_PTR(err); |
447 | } | |
448 | ||
83ddfebd KM |
449 | struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args, |
450 | struct rpc_xprt *xprt) | |
451 | { | |
452 | struct rpc_clnt *clnt = NULL; | |
ad01b2c6 | 453 | struct rpc_xprt_switch *xps; |
83ddfebd | 454 | |
ad01b2c6 TM |
455 | xps = xprt_switch_alloc(xprt, GFP_KERNEL); |
456 | if (xps == NULL) | |
457 | return ERR_PTR(-ENOMEM); | |
458 | ||
459 | clnt = rpc_new_client(args, xps, xprt, NULL); | |
83ddfebd KM |
460 | if (IS_ERR(clnt)) |
461 | return clnt; | |
462 | ||
463 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
464 | int err = rpc_ping(clnt); | |
465 | if (err != 0) { | |
466 | rpc_shutdown_client(clnt); | |
467 | return ERR_PTR(err); | |
468 | } | |
469 | } | |
470 | ||
471 | clnt->cl_softrtry = 1; | |
472 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
473 | clnt->cl_softrtry = 0; | |
474 | ||
475 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) | |
476 | clnt->cl_autobind = 1; | |
2aca5b86 TM |
477 | if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT) |
478 | clnt->cl_noretranstimeo = 1; | |
83ddfebd KM |
479 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
480 | clnt->cl_discrtry = 1; | |
481 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) | |
482 | clnt->cl_chatty = 1; | |
483 | ||
484 | return clnt; | |
485 | } | |
486 | EXPORT_SYMBOL_GPL(rpc_create_xprt); | |
487 | ||
2c53040f | 488 | /** |
c2866763 CL |
489 | * rpc_create - create an RPC client and transport with one call |
490 | * @args: rpc_clnt create argument structure | |
491 | * | |
492 | * Creates and initializes an RPC transport and an RPC client. | |
493 | * | |
494 | * It can ping the server in order to determine if it is up, and to see if | |
495 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
496 | * this behavior so asynchronous tasks can also use rpc_create. | |
497 | */ | |
498 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
499 | { | |
500 | struct rpc_xprt *xprt; | |
3c341b0b | 501 | struct xprt_create xprtargs = { |
9a23e332 | 502 | .net = args->net, |
4fa016eb | 503 | .ident = args->protocol, |
d3bc9a1d | 504 | .srcaddr = args->saddress, |
96802a09 FM |
505 | .dstaddr = args->address, |
506 | .addrlen = args->addrsize, | |
4e0038b6 | 507 | .servername = args->servername, |
f300baba | 508 | .bc_xprt = args->bc_xprt, |
96802a09 | 509 | }; |
510deb0d | 510 | char servername[48]; |
c2866763 | 511 | |
b7993ceb TM |
512 | if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) |
513 | xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; | |
33d90ac0 BF |
514 | if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) |
515 | xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; | |
43780b87 CL |
516 | /* |
517 | * If the caller chooses not to specify a hostname, whip | |
518 | * up a string representation of the passed-in address. | |
519 | */ | |
4e0038b6 | 520 | if (xprtargs.servername == NULL) { |
176e21ee CL |
521 | struct sockaddr_un *sun = |
522 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
523 | struct sockaddr_in *sin = |
524 | (struct sockaddr_in *)args->address; | |
525 | struct sockaddr_in6 *sin6 = | |
526 | (struct sockaddr_in6 *)args->address; | |
527 | ||
510deb0d CL |
528 | servername[0] = '\0'; |
529 | switch (args->address->sa_family) { | |
176e21ee CL |
530 | case AF_LOCAL: |
531 | snprintf(servername, sizeof(servername), "%s", | |
532 | sun->sun_path); | |
533 | break; | |
da09eb93 | 534 | case AF_INET: |
21454aaa HH |
535 | snprintf(servername, sizeof(servername), "%pI4", |
536 | &sin->sin_addr.s_addr); | |
510deb0d | 537 | break; |
da09eb93 | 538 | case AF_INET6: |
5b095d98 | 539 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 540 | &sin6->sin6_addr); |
510deb0d | 541 | break; |
510deb0d CL |
542 | default: |
543 | /* caller wants default server name, but | |
544 | * address family isn't recognized. */ | |
545 | return ERR_PTR(-EINVAL); | |
546 | } | |
4e0038b6 | 547 | xprtargs.servername = servername; |
43780b87 CL |
548 | } |
549 | ||
510deb0d CL |
550 | xprt = xprt_create_transport(&xprtargs); |
551 | if (IS_ERR(xprt)) | |
552 | return (struct rpc_clnt *)xprt; | |
553 | ||
c2866763 CL |
554 | /* |
555 | * By default, kernel RPC client connects from a reserved port. | |
556 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
557 | * but it is always enabled for rpciod, which handles the connect | |
558 | * operation. | |
559 | */ | |
560 | xprt->resvport = 1; | |
561 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
562 | xprt->resvport = 0; | |
563 | ||
83ddfebd | 564 | return rpc_create_xprt(args, xprt); |
c2866763 | 565 | } |
b86acd50 | 566 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 567 | |
1da177e4 LT |
568 | /* |
569 | * This function clones the RPC client structure. It allows us to share the | |
570 | * same transport while varying parameters such as the authentication | |
571 | * flavour. | |
572 | */ | |
1b63a751 CL |
573 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
574 | struct rpc_clnt *clnt) | |
1da177e4 | 575 | { |
ad01b2c6 | 576 | struct rpc_xprt_switch *xps; |
2446ab60 | 577 | struct rpc_xprt *xprt; |
1b63a751 CL |
578 | struct rpc_clnt *new; |
579 | int err; | |
1da177e4 | 580 | |
1b63a751 | 581 | err = -ENOMEM; |
2446ab60 TM |
582 | rcu_read_lock(); |
583 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
ad01b2c6 | 584 | xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); |
2446ab60 | 585 | rcu_read_unlock(); |
ad01b2c6 TM |
586 | if (xprt == NULL || xps == NULL) { |
587 | xprt_put(xprt); | |
588 | xprt_switch_put(xps); | |
1b63a751 | 589 | goto out_err; |
ad01b2c6 | 590 | } |
1b63a751 | 591 | args->servername = xprt->servername; |
03a9a42a | 592 | args->nodename = clnt->cl_nodename; |
1b63a751 | 593 | |
ad01b2c6 | 594 | new = rpc_new_client(args, xps, xprt, clnt); |
1b63a751 CL |
595 | if (IS_ERR(new)) { |
596 | err = PTR_ERR(new); | |
a58e0be6 | 597 | goto out_err; |
1b63a751 CL |
598 | } |
599 | ||
1b63a751 CL |
600 | /* Turn off autobind on clones */ |
601 | new->cl_autobind = 0; | |
602 | new->cl_softrtry = clnt->cl_softrtry; | |
2aca5b86 | 603 | new->cl_noretranstimeo = clnt->cl_noretranstimeo; |
1b63a751 CL |
604 | new->cl_discrtry = clnt->cl_discrtry; |
605 | new->cl_chatty = clnt->cl_chatty; | |
1da177e4 | 606 | return new; |
1b63a751 | 607 | |
1b63a751 | 608 | out_err: |
0dc47877 | 609 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 610 | return ERR_PTR(err); |
1da177e4 | 611 | } |
1b63a751 CL |
612 | |
613 | /** | |
614 | * rpc_clone_client - Clone an RPC client structure | |
615 | * | |
616 | * @clnt: RPC client whose parameters are copied | |
617 | * | |
618 | * Returns a fresh RPC client or an ERR_PTR. | |
619 | */ | |
620 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
621 | { | |
622 | struct rpc_create_args args = { | |
623 | .program = clnt->cl_program, | |
624 | .prognumber = clnt->cl_prog, | |
625 | .version = clnt->cl_vers, | |
626 | .authflavor = clnt->cl_auth->au_flavor, | |
1b63a751 CL |
627 | }; |
628 | return __rpc_clone_client(&args, clnt); | |
629 | } | |
e8914c65 | 630 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 631 | |
ba9b584c CL |
632 | /** |
633 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
634 | * | |
635 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 636 | * @flavor: security flavor for new client |
ba9b584c CL |
637 | * |
638 | * Returns a fresh RPC client or an ERR_PTR. | |
639 | */ | |
640 | struct rpc_clnt * | |
641 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
642 | { | |
643 | struct rpc_create_args args = { | |
644 | .program = clnt->cl_program, | |
645 | .prognumber = clnt->cl_prog, | |
646 | .version = clnt->cl_vers, | |
647 | .authflavor = flavor, | |
ba9b584c CL |
648 | }; |
649 | return __rpc_clone_client(&args, clnt); | |
650 | } | |
651 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
652 | ||
40b00b6b TM |
653 | /** |
654 | * rpc_switch_client_transport: switch the RPC transport on the fly | |
655 | * @clnt: pointer to a struct rpc_clnt | |
656 | * @args: pointer to the new transport arguments | |
657 | * @timeout: pointer to the new timeout parameters | |
658 | * | |
659 | * This function allows the caller to switch the RPC transport for the | |
660 | * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS | |
661 | * server, for instance. It assumes that the caller has ensured that | |
662 | * there are no active RPC tasks by using some form of locking. | |
663 | * | |
664 | * Returns zero if "clnt" is now using the new xprt. Otherwise a | |
665 | * negative errno is returned, and "clnt" continues to use the old | |
666 | * xprt. | |
667 | */ | |
668 | int rpc_switch_client_transport(struct rpc_clnt *clnt, | |
669 | struct xprt_create *args, | |
670 | const struct rpc_timeout *timeout) | |
671 | { | |
672 | const struct rpc_timeout *old_timeo; | |
673 | rpc_authflavor_t pseudoflavor; | |
ad01b2c6 | 674 | struct rpc_xprt_switch *xps, *oldxps; |
40b00b6b TM |
675 | struct rpc_xprt *xprt, *old; |
676 | struct rpc_clnt *parent; | |
677 | int err; | |
678 | ||
679 | xprt = xprt_create_transport(args); | |
680 | if (IS_ERR(xprt)) { | |
681 | dprintk("RPC: failed to create new xprt for clnt %p\n", | |
682 | clnt); | |
683 | return PTR_ERR(xprt); | |
684 | } | |
685 | ||
ad01b2c6 TM |
686 | xps = xprt_switch_alloc(xprt, GFP_KERNEL); |
687 | if (xps == NULL) { | |
688 | xprt_put(xprt); | |
689 | return -ENOMEM; | |
690 | } | |
691 | ||
40b00b6b TM |
692 | pseudoflavor = clnt->cl_auth->au_flavor; |
693 | ||
694 | old_timeo = clnt->cl_timeout; | |
695 | old = rpc_clnt_set_transport(clnt, xprt, timeout); | |
ad01b2c6 | 696 | oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps); |
40b00b6b TM |
697 | |
698 | rpc_unregister_client(clnt); | |
699 | __rpc_clnt_remove_pipedir(clnt); | |
b4b9d2cc | 700 | rpc_clnt_debugfs_unregister(clnt); |
40b00b6b TM |
701 | |
702 | /* | |
703 | * A new transport was created. "clnt" therefore | |
704 | * becomes the root of a new cl_parent tree. clnt's | |
705 | * children, if it has any, still point to the old xprt. | |
706 | */ | |
707 | parent = clnt->cl_parent; | |
708 | clnt->cl_parent = clnt; | |
709 | ||
710 | /* | |
711 | * The old rpc_auth cache cannot be re-used. GSS | |
712 | * contexts in particular are between a single | |
713 | * client and server. | |
714 | */ | |
715 | err = rpc_client_register(clnt, pseudoflavor, NULL); | |
716 | if (err) | |
717 | goto out_revert; | |
718 | ||
719 | synchronize_rcu(); | |
720 | if (parent != clnt) | |
721 | rpc_release_client(parent); | |
ad01b2c6 | 722 | xprt_switch_put(oldxps); |
40b00b6b TM |
723 | xprt_put(old); |
724 | dprintk("RPC: replaced xprt for clnt %p\n", clnt); | |
725 | return 0; | |
726 | ||
727 | out_revert: | |
ad01b2c6 | 728 | xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps); |
40b00b6b TM |
729 | rpc_clnt_set_transport(clnt, old, old_timeo); |
730 | clnt->cl_parent = parent; | |
731 | rpc_client_register(clnt, pseudoflavor, NULL); | |
ad01b2c6 | 732 | xprt_switch_put(xps); |
40b00b6b TM |
733 | xprt_put(xprt); |
734 | dprintk("RPC: failed to switch xprt for clnt %p\n", clnt); | |
735 | return err; | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(rpc_switch_client_transport); | |
738 | ||
58f9612c TM |
739 | /* |
740 | * Kill all tasks for the given client. | |
741 | * XXX: kill their descendants as well? | |
742 | */ | |
743 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
744 | { | |
745 | struct rpc_task *rovr; | |
746 | ||
747 | ||
748 | if (list_empty(&clnt->cl_tasks)) | |
749 | return; | |
750 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
751 | /* | |
752 | * Spin lock all_tasks to prevent changes... | |
753 | */ | |
754 | spin_lock(&clnt->cl_lock); | |
755 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
756 | if (!RPC_IS_ACTIVATED(rovr)) | |
757 | continue; | |
758 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
759 | rovr->tk_flags |= RPC_TASK_KILLED; | |
760 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
761 | if (RPC_IS_QUEUED(rovr)) |
762 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
763 | rovr); | |
58f9612c TM |
764 | } |
765 | } | |
766 | spin_unlock(&clnt->cl_lock); | |
767 | } | |
768 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
769 | ||
1da177e4 LT |
770 | /* |
771 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 772 | * requests. |
1da177e4 | 773 | */ |
4c402b40 | 774 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 775 | { |
168e4b39 WAA |
776 | might_sleep(); |
777 | ||
4e0038b6 | 778 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
55909f21 | 779 | clnt->cl_program->name, |
4e0038b6 | 780 | rcu_dereference(clnt->cl_xprt)->servername); |
1da177e4 | 781 | |
34f52e35 | 782 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 783 | rpc_killall_tasks(clnt); |
532347e2 | 784 | wait_event_timeout(destroy_wait, |
34f52e35 | 785 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
786 | } |
787 | ||
4c402b40 | 788 | rpc_release_client(clnt); |
1da177e4 | 789 | } |
e8914c65 | 790 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
791 | |
792 | /* | |
34f52e35 | 793 | * Free an RPC client |
1da177e4 | 794 | */ |
d07ba842 | 795 | static struct rpc_clnt * |
006abe88 | 796 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 797 | { |
d07ba842 TM |
798 | struct rpc_clnt *parent = NULL; |
799 | ||
4e0038b6 | 800 | dprintk_rcu("RPC: destroying %s client for %s\n", |
55909f21 | 801 | clnt->cl_program->name, |
4e0038b6 | 802 | rcu_dereference(clnt->cl_xprt)->servername); |
6eac7d3f | 803 | if (clnt->cl_parent != clnt) |
d07ba842 | 804 | parent = clnt->cl_parent; |
b4b9d2cc | 805 | rpc_clnt_debugfs_unregister(clnt); |
f5131257 | 806 | rpc_clnt_remove_pipedir(clnt); |
adb6fa7f | 807 | rpc_unregister_client(clnt); |
11c556b3 CL |
808 | rpc_free_iostats(clnt->cl_metrics); |
809 | clnt->cl_metrics = NULL; | |
2446ab60 | 810 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
ad01b2c6 | 811 | xprt_iter_destroy(&clnt->cl_xpi); |
4ada539e | 812 | rpciod_down(); |
2f048db4 | 813 | rpc_free_clid(clnt); |
1da177e4 | 814 | kfree(clnt); |
d07ba842 | 815 | return parent; |
1da177e4 LT |
816 | } |
817 | ||
1dd17ec6 TM |
818 | /* |
819 | * Free an RPC client | |
820 | */ | |
d07ba842 | 821 | static struct rpc_clnt * |
006abe88 | 822 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 823 | { |
d07ba842 TM |
824 | if (clnt->cl_auth == NULL) |
825 | return rpc_free_client(clnt); | |
1dd17ec6 TM |
826 | |
827 | /* | |
828 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
829 | * release remaining GSS contexts. This mechanism ensures | |
830 | * that it can do so safely. | |
831 | */ | |
006abe88 | 832 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
833 | rpcauth_release(clnt->cl_auth); |
834 | clnt->cl_auth = NULL; | |
006abe88 | 835 | if (atomic_dec_and_test(&clnt->cl_count)) |
d07ba842 TM |
836 | return rpc_free_client(clnt); |
837 | return NULL; | |
1dd17ec6 TM |
838 | } |
839 | ||
1da177e4 | 840 | /* |
34f52e35 | 841 | * Release reference to the RPC client |
1da177e4 LT |
842 | */ |
843 | void | |
844 | rpc_release_client(struct rpc_clnt *clnt) | |
845 | { | |
34f52e35 | 846 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 847 | |
d07ba842 TM |
848 | do { |
849 | if (list_empty(&clnt->cl_tasks)) | |
850 | wake_up(&destroy_wait); | |
851 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
852 | break; | |
853 | clnt = rpc_free_auth(clnt); | |
854 | } while (clnt != NULL); | |
34f52e35 | 855 | } |
1d658336 | 856 | EXPORT_SYMBOL_GPL(rpc_release_client); |
34f52e35 | 857 | |
007e251f AG |
858 | /** |
859 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
860 | * @old: old rpc_client |
861 | * @program: rpc program to set | |
862 | * @vers: rpc program version | |
007e251f AG |
863 | * |
864 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
865 | * of use for enabling different RPC programs to share the same transport. | |
866 | * The Sun NFSv2/v3 ACL protocol can do this. | |
867 | */ | |
868 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 869 | const struct rpc_program *program, |
89eb21c3 | 870 | u32 vers) |
007e251f | 871 | { |
f994c43d TM |
872 | struct rpc_create_args args = { |
873 | .program = program, | |
874 | .prognumber = program->number, | |
875 | .version = vers, | |
876 | .authflavor = old->cl_auth->au_flavor, | |
f994c43d | 877 | }; |
007e251f | 878 | struct rpc_clnt *clnt; |
007e251f AG |
879 | int err; |
880 | ||
f994c43d | 881 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
882 | if (IS_ERR(clnt)) |
883 | goto out; | |
caabea8a | 884 | err = rpc_ping(clnt); |
007e251f AG |
885 | if (err != 0) { |
886 | rpc_shutdown_client(clnt); | |
887 | clnt = ERR_PTR(err); | |
888 | } | |
cca5172a | 889 | out: |
007e251f AG |
890 | return clnt; |
891 | } | |
e8914c65 | 892 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 893 | |
58f9612c TM |
894 | void rpc_task_release_client(struct rpc_task *task) |
895 | { | |
896 | struct rpc_clnt *clnt = task->tk_client; | |
897 | ||
898 | if (clnt != NULL) { | |
899 | /* Remove from client task list */ | |
900 | spin_lock(&clnt->cl_lock); | |
901 | list_del(&task->tk_task); | |
902 | spin_unlock(&clnt->cl_lock); | |
903 | task->tk_client = NULL; | |
904 | ||
905 | rpc_release_client(clnt); | |
906 | } | |
907 | } | |
908 | ||
909 | static | |
910 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
911 | { | |
912 | if (clnt != NULL) { | |
913 | rpc_task_release_client(task); | |
914 | task->tk_client = clnt; | |
006abe88 | 915 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
916 | if (clnt->cl_softrtry) |
917 | task->tk_flags |= RPC_TASK_SOFT; | |
8a19a0b6 TM |
918 | if (clnt->cl_noretranstimeo) |
919 | task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT; | |
3c87ef6e JL |
920 | if (atomic_read(&clnt->cl_swapper)) |
921 | task->tk_flags |= RPC_TASK_SWAPPER; | |
58f9612c TM |
922 | /* Add to the client's list of all tasks */ |
923 | spin_lock(&clnt->cl_lock); | |
924 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
925 | spin_unlock(&clnt->cl_lock); | |
926 | } | |
927 | } | |
928 | ||
929 | static void | |
930 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
931 | { | |
932 | if (msg != NULL) { | |
933 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
934 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
935 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
936 | if (msg->rpc_cred != NULL) |
937 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
938 | } |
939 | } | |
940 | ||
1da177e4 LT |
941 | /* |
942 | * Default callback for async RPC calls | |
943 | */ | |
944 | static void | |
963d8fe5 | 945 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
946 | { |
947 | } | |
948 | ||
963d8fe5 TM |
949 | static const struct rpc_call_ops rpc_default_ops = { |
950 | .rpc_call_done = rpc_default_callback, | |
951 | }; | |
952 | ||
c970aa85 TM |
953 | /** |
954 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
955 | * @task_setup_data: pointer to task initialisation data | |
956 | */ | |
957 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 958 | { |
19445b99 | 959 | struct rpc_task *task; |
6e5b70e9 | 960 | |
84115e1c | 961 | task = rpc_new_task(task_setup_data); |
19445b99 | 962 | if (IS_ERR(task)) |
50859259 | 963 | goto out; |
6e5b70e9 | 964 | |
58f9612c TM |
965 | rpc_task_set_client(task, task_setup_data->rpc_client); |
966 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
967 | ||
58f9612c TM |
968 | if (task->tk_action == NULL) |
969 | rpc_call_start(task); | |
970 | ||
6e5b70e9 TM |
971 | atomic_inc(&task->tk_count); |
972 | rpc_execute(task); | |
6e5b70e9 | 973 | out: |
19445b99 | 974 | return task; |
6e5b70e9 | 975 | } |
c970aa85 | 976 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
977 | |
978 | /** | |
979 | * rpc_call_sync - Perform a synchronous RPC call | |
980 | * @clnt: pointer to RPC client | |
981 | * @msg: RPC call parameters | |
982 | * @flags: RPC call flags | |
1da177e4 | 983 | */ |
cbc20059 | 984 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
985 | { |
986 | struct rpc_task *task; | |
84115e1c TM |
987 | struct rpc_task_setup task_setup_data = { |
988 | .rpc_client = clnt, | |
989 | .rpc_message = msg, | |
990 | .callback_ops = &rpc_default_ops, | |
991 | .flags = flags, | |
992 | }; | |
6e5b70e9 | 993 | int status; |
1da177e4 | 994 | |
50d2bdb1 WAA |
995 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
996 | if (flags & RPC_TASK_ASYNC) { | |
997 | rpc_release_calldata(task_setup_data.callback_ops, | |
998 | task_setup_data.callback_data); | |
999 | return -EINVAL; | |
1000 | } | |
1da177e4 | 1001 | |
c970aa85 | 1002 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1003 | if (IS_ERR(task)) |
1004 | return PTR_ERR(task); | |
e60859ac | 1005 | status = task->tk_status; |
bde8f00c | 1006 | rpc_put_task(task); |
1da177e4 LT |
1007 | return status; |
1008 | } | |
e8914c65 | 1009 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 1010 | |
6e5b70e9 TM |
1011 | /** |
1012 | * rpc_call_async - Perform an asynchronous RPC call | |
1013 | * @clnt: pointer to RPC client | |
1014 | * @msg: RPC call parameters | |
1015 | * @flags: RPC call flags | |
65b6e42c | 1016 | * @tk_ops: RPC call ops |
6e5b70e9 | 1017 | * @data: user call data |
1da177e4 LT |
1018 | */ |
1019 | int | |
cbc20059 | 1020 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 1021 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
1022 | { |
1023 | struct rpc_task *task; | |
84115e1c TM |
1024 | struct rpc_task_setup task_setup_data = { |
1025 | .rpc_client = clnt, | |
1026 | .rpc_message = msg, | |
1027 | .callback_ops = tk_ops, | |
1028 | .callback_data = data, | |
1029 | .flags = flags|RPC_TASK_ASYNC, | |
1030 | }; | |
1da177e4 | 1031 | |
c970aa85 | 1032 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
1033 | if (IS_ERR(task)) |
1034 | return PTR_ERR(task); | |
1035 | rpc_put_task(task); | |
1036 | return 0; | |
1da177e4 | 1037 | } |
e8914c65 | 1038 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 1039 | |
9e00abc3 | 1040 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1041 | /** |
1042 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
1043 | * rpc_execute against it | |
7a73fdde | 1044 | * @req: RPC request |
55ae1aab | 1045 | */ |
0f419791 | 1046 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req) |
55ae1aab RL |
1047 | { |
1048 | struct rpc_task *task; | |
1049 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
1050 | struct rpc_task_setup task_setup_data = { | |
0f419791 | 1051 | .callback_ops = &rpc_default_ops, |
3832591e | 1052 | .flags = RPC_TASK_SOFTCONN, |
55ae1aab RL |
1053 | }; |
1054 | ||
1055 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
1056 | /* | |
1057 | * Create an rpc_task to send the data | |
1058 | */ | |
1059 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 1060 | if (IS_ERR(task)) { |
55ae1aab RL |
1061 | xprt_free_bc_request(req); |
1062 | goto out; | |
1063 | } | |
1064 | task->tk_rqstp = req; | |
1065 | ||
1066 | /* | |
1067 | * Set up the xdr_buf length. | |
1068 | * This also indicates that the buffer is XDR encoded already. | |
1069 | */ | |
1070 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
1071 | xbufp->tail[0].iov_len; | |
1072 | ||
1073 | task->tk_action = call_bc_transmit; | |
1074 | atomic_inc(&task->tk_count); | |
9a6478f6 | 1075 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
1076 | rpc_execute(task); |
1077 | ||
1078 | out: | |
1079 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
1080 | return task; | |
1081 | } | |
9e00abc3 | 1082 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1083 | |
77de2c59 TM |
1084 | void |
1085 | rpc_call_start(struct rpc_task *task) | |
1086 | { | |
1087 | task->tk_action = call_start; | |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
1090 | ||
ed39440a CL |
1091 | /** |
1092 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
1093 | * @clnt: RPC client structure | |
1094 | * @buf: target buffer | |
65b6e42c | 1095 | * @bufsize: length of target buffer |
ed39440a CL |
1096 | * |
1097 | * Returns the number of bytes that are actually in the stored address. | |
1098 | */ | |
1099 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
1100 | { | |
1101 | size_t bytes; | |
2446ab60 TM |
1102 | struct rpc_xprt *xprt; |
1103 | ||
1104 | rcu_read_lock(); | |
1105 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 1106 | |
2446ab60 | 1107 | bytes = xprt->addrlen; |
ed39440a CL |
1108 | if (bytes > bufsize) |
1109 | bytes = bufsize; | |
2446ab60 TM |
1110 | memcpy(buf, &xprt->addr, bytes); |
1111 | rcu_read_unlock(); | |
1112 | ||
1113 | return bytes; | |
ed39440a | 1114 | } |
b86acd50 | 1115 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 1116 | |
f425eba4 CL |
1117 | /** |
1118 | * rpc_peeraddr2str - return remote peer address in printable format | |
1119 | * @clnt: RPC client structure | |
1120 | * @format: address format | |
1121 | * | |
2446ab60 TM |
1122 | * NB: the lifetime of the memory referenced by the returned pointer is |
1123 | * the same as the rpc_xprt itself. As long as the caller uses this | |
1124 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 1125 | */ |
b454ae90 CL |
1126 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
1127 | enum rpc_display_format_t format) | |
f425eba4 | 1128 | { |
2446ab60 TM |
1129 | struct rpc_xprt *xprt; |
1130 | ||
1131 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
1132 | |
1133 | if (xprt->address_strings[format] != NULL) | |
1134 | return xprt->address_strings[format]; | |
1135 | else | |
1136 | return "unprintable"; | |
f425eba4 | 1137 | } |
b86acd50 | 1138 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 1139 | |
2e738fdc CL |
1140 | static const struct sockaddr_in rpc_inaddr_loopback = { |
1141 | .sin_family = AF_INET, | |
1142 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1143 | }; | |
1144 | ||
1145 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
1146 | .sin6_family = AF_INET6, | |
1147 | .sin6_addr = IN6ADDR_ANY_INIT, | |
1148 | }; | |
1149 | ||
1150 | /* | |
1151 | * Try a getsockname() on a connected datagram socket. Using a | |
1152 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
1153 | * This conserves the ephemeral port number space. | |
1154 | * | |
1155 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1156 | * negative errno is returned. | |
1157 | */ | |
1158 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
1159 | struct sockaddr *buf, int buflen) | |
1160 | { | |
1161 | struct socket *sock; | |
1162 | int err; | |
1163 | ||
1164 | err = __sock_create(net, sap->sa_family, | |
1165 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1166 | if (err < 0) { | |
1167 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1168 | goto out; | |
1169 | } | |
1170 | ||
1171 | switch (sap->sa_family) { | |
1172 | case AF_INET: | |
1173 | err = kernel_bind(sock, | |
1174 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1175 | sizeof(rpc_inaddr_loopback)); | |
1176 | break; | |
1177 | case AF_INET6: | |
1178 | err = kernel_bind(sock, | |
1179 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1180 | sizeof(rpc_in6addr_loopback)); | |
1181 | break; | |
1182 | default: | |
1183 | err = -EAFNOSUPPORT; | |
1184 | goto out; | |
1185 | } | |
1186 | if (err < 0) { | |
1187 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1188 | goto out_release; | |
1189 | } | |
1190 | ||
1191 | err = kernel_connect(sock, sap, salen, 0); | |
1192 | if (err < 0) { | |
1193 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1194 | goto out_release; | |
1195 | } | |
1196 | ||
1197 | err = kernel_getsockname(sock, buf, &buflen); | |
1198 | if (err < 0) { | |
1199 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1200 | goto out_release; | |
1201 | } | |
1202 | ||
1203 | err = 0; | |
1204 | if (buf->sa_family == AF_INET6) { | |
1205 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1206 | sin6->sin6_scope_id = 0; | |
1207 | } | |
1208 | dprintk("RPC: %s succeeded\n", __func__); | |
1209 | ||
1210 | out_release: | |
1211 | sock_release(sock); | |
1212 | out: | |
1213 | return err; | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Scraping a connected socket failed, so we don't have a useable | |
1218 | * local address. Fallback: generate an address that will prevent | |
1219 | * the server from calling us back. | |
1220 | * | |
1221 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1222 | * negative errno is returned. | |
1223 | */ | |
1224 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1225 | { | |
1226 | switch (family) { | |
1227 | case AF_INET: | |
1228 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1229 | return -EINVAL; | |
1230 | memcpy(buf, &rpc_inaddr_loopback, | |
1231 | sizeof(rpc_inaddr_loopback)); | |
1232 | break; | |
1233 | case AF_INET6: | |
1234 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1235 | return -EINVAL; | |
1236 | memcpy(buf, &rpc_in6addr_loopback, | |
1237 | sizeof(rpc_in6addr_loopback)); | |
0b161e63 | 1238 | break; |
2e738fdc CL |
1239 | default: |
1240 | dprintk("RPC: %s: address family not supported\n", | |
1241 | __func__); | |
1242 | return -EAFNOSUPPORT; | |
1243 | } | |
1244 | dprintk("RPC: %s: succeeded\n", __func__); | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | /** | |
1249 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1250 | * @clnt: RPC client structure | |
1251 | * @buf: target buffer | |
1252 | * @buflen: size of target buffer, in bytes | |
1253 | * | |
1254 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1255 | * otherwise, a negative errno is returned. | |
1256 | * | |
1257 | * This works even if the underlying transport is not currently connected, | |
1258 | * or if the upper layer never previously provided a source address. | |
1259 | * | |
1260 | * The result of this function call is transient: multiple calls in | |
1261 | * succession may give different results, depending on how local | |
1262 | * networking configuration changes over time. | |
1263 | */ | |
1264 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1265 | { | |
1266 | struct sockaddr_storage address; | |
1267 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1268 | struct rpc_xprt *xprt; | |
1269 | struct net *net; | |
1270 | size_t salen; | |
1271 | int err; | |
1272 | ||
1273 | rcu_read_lock(); | |
1274 | xprt = rcu_dereference(clnt->cl_xprt); | |
1275 | salen = xprt->addrlen; | |
1276 | memcpy(sap, &xprt->addr, salen); | |
1277 | net = get_net(xprt->xprt_net); | |
1278 | rcu_read_unlock(); | |
1279 | ||
1280 | rpc_set_port(sap, 0); | |
1281 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1282 | put_net(net); | |
1283 | if (err != 0) | |
1284 | /* Couldn't discover local address, return ANYADDR */ | |
1285 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1286 | return 0; | |
1287 | } | |
1288 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1289 | ||
1da177e4 LT |
1290 | void |
1291 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1292 | { | |
2446ab60 TM |
1293 | struct rpc_xprt *xprt; |
1294 | ||
1295 | rcu_read_lock(); | |
1296 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1297 | if (xprt->ops->set_buffer_size) |
1298 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1299 | rcu_read_unlock(); |
1da177e4 | 1300 | } |
e8914c65 | 1301 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1302 | |
2446ab60 TM |
1303 | /** |
1304 | * rpc_protocol - Get transport protocol number for an RPC client | |
1305 | * @clnt: RPC client to query | |
1306 | * | |
1307 | */ | |
1308 | int rpc_protocol(struct rpc_clnt *clnt) | |
1309 | { | |
1310 | int protocol; | |
1311 | ||
1312 | rcu_read_lock(); | |
1313 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1314 | rcu_read_unlock(); | |
1315 | return protocol; | |
1316 | } | |
1317 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1318 | ||
1319 | /** | |
1320 | * rpc_net_ns - Get the network namespace for this RPC client | |
1321 | * @clnt: RPC client to query | |
1322 | * | |
1323 | */ | |
1324 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1325 | { | |
1326 | struct net *ret; | |
1327 | ||
1328 | rcu_read_lock(); | |
1329 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1330 | rcu_read_unlock(); | |
1331 | return ret; | |
1332 | } | |
1333 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1334 | ||
1335 | /** | |
1336 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1337 | * @clnt: RPC client to query | |
1da177e4 LT |
1338 | * |
1339 | * For stream transports, this is one RPC record fragment (see RFC | |
1340 | * 1831), as we don't support multi-record requests yet. For datagram | |
1341 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1342 | * RPC header sizes. | |
1343 | */ | |
1344 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1345 | { | |
2446ab60 TM |
1346 | size_t ret; |
1347 | ||
1348 | rcu_read_lock(); | |
1349 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1350 | rcu_read_unlock(); | |
1351 | return ret; | |
1da177e4 | 1352 | } |
b86acd50 | 1353 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1354 | |
edddbb1e | 1355 | /** |
512e4b29 | 1356 | * rpc_get_timeout - Get timeout for transport in units of HZ |
edddbb1e WAA |
1357 | * @clnt: RPC client to query |
1358 | */ | |
1359 | unsigned long rpc_get_timeout(struct rpc_clnt *clnt) | |
1360 | { | |
1361 | unsigned long ret; | |
1362 | ||
1363 | rcu_read_lock(); | |
1364 | ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval; | |
1365 | rcu_read_unlock(); | |
1366 | return ret; | |
1367 | } | |
1368 | EXPORT_SYMBOL_GPL(rpc_get_timeout); | |
1369 | ||
35f5a422 CL |
1370 | /** |
1371 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1372 | * @clnt: client to rebind | |
1373 | * | |
1374 | */ | |
1375 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1376 | { | |
2446ab60 TM |
1377 | if (clnt->cl_autobind) { |
1378 | rcu_read_lock(); | |
1379 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1380 | rcu_read_unlock(); | |
1381 | } | |
35f5a422 | 1382 | } |
b86acd50 | 1383 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1384 | |
aae2006e AA |
1385 | /* |
1386 | * Restart an (async) RPC call from the call_prepare state. | |
1387 | * Usually called from within the exit handler. | |
1388 | */ | |
f1f88fc7 | 1389 | int |
aae2006e AA |
1390 | rpc_restart_call_prepare(struct rpc_task *task) |
1391 | { | |
1392 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1393 | return 0; |
d00c5d43 | 1394 | task->tk_action = call_start; |
494314c4 | 1395 | task->tk_status = 0; |
d00c5d43 TM |
1396 | if (task->tk_ops->rpc_call_prepare != NULL) |
1397 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1398 | return 1; |
aae2006e AA |
1399 | } |
1400 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1401 | ||
1da177e4 LT |
1402 | /* |
1403 | * Restart an (async) RPC call. Usually called from within the | |
1404 | * exit handler. | |
1405 | */ | |
f1f88fc7 | 1406 | int |
1da177e4 LT |
1407 | rpc_restart_call(struct rpc_task *task) |
1408 | { | |
1409 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1410 | return 0; |
1da177e4 | 1411 | task->tk_action = call_start; |
494314c4 | 1412 | task->tk_status = 0; |
f1f88fc7 | 1413 | return 1; |
1da177e4 | 1414 | } |
e8914c65 | 1415 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1416 | |
f895b252 | 1417 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b4b9d2cc JL |
1418 | const char |
1419 | *rpc_proc_name(const struct rpc_task *task) | |
3748f1e4 CL |
1420 | { |
1421 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1422 | ||
1423 | if (proc) { | |
1424 | if (proc->p_name) | |
1425 | return proc->p_name; | |
1426 | else | |
1427 | return "NULL"; | |
1428 | } else | |
1429 | return "no proc"; | |
1430 | } | |
1431 | #endif | |
1432 | ||
1da177e4 LT |
1433 | /* |
1434 | * 0. Initial state | |
1435 | * | |
1436 | * Other FSM states can be visited zero or more times, but | |
1437 | * this state is visited exactly once for each RPC. | |
1438 | */ | |
1439 | static void | |
1440 | call_start(struct rpc_task *task) | |
1441 | { | |
1442 | struct rpc_clnt *clnt = task->tk_client; | |
1443 | ||
3748f1e4 | 1444 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
55909f21 | 1445 | clnt->cl_program->name, clnt->cl_vers, |
3748f1e4 | 1446 | rpc_proc_name(task), |
46121cf7 | 1447 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1448 | |
1449 | /* Increment call count */ | |
1450 | task->tk_msg.rpc_proc->p_count++; | |
1451 | clnt->cl_stats->rpccnt++; | |
1452 | task->tk_action = call_reserve; | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * 1. Reserve an RPC call slot | |
1457 | */ | |
1458 | static void | |
1459 | call_reserve(struct rpc_task *task) | |
1460 | { | |
46121cf7 | 1461 | dprint_status(task); |
1da177e4 | 1462 | |
1da177e4 LT |
1463 | task->tk_status = 0; |
1464 | task->tk_action = call_reserveresult; | |
1465 | xprt_reserve(task); | |
1466 | } | |
1467 | ||
ba60eb25 TM |
1468 | static void call_retry_reserve(struct rpc_task *task); |
1469 | ||
1da177e4 LT |
1470 | /* |
1471 | * 1b. Grok the result of xprt_reserve() | |
1472 | */ | |
1473 | static void | |
1474 | call_reserveresult(struct rpc_task *task) | |
1475 | { | |
1476 | int status = task->tk_status; | |
1477 | ||
46121cf7 | 1478 | dprint_status(task); |
1da177e4 LT |
1479 | |
1480 | /* | |
1481 | * After a call to xprt_reserve(), we must have either | |
1482 | * a request slot or else an error status. | |
1483 | */ | |
1484 | task->tk_status = 0; | |
1485 | if (status >= 0) { | |
1486 | if (task->tk_rqstp) { | |
f2d47d02 | 1487 | task->tk_action = call_refresh; |
1da177e4 LT |
1488 | return; |
1489 | } | |
1490 | ||
1491 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1492 | __func__, status); |
1da177e4 LT |
1493 | rpc_exit(task, -EIO); |
1494 | return; | |
1495 | } | |
1496 | ||
1497 | /* | |
1498 | * Even though there was an error, we may have acquired | |
1499 | * a request slot somehow. Make sure not to leak it. | |
1500 | */ | |
1501 | if (task->tk_rqstp) { | |
1502 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1503 | __func__, status); |
1da177e4 LT |
1504 | xprt_release(task); |
1505 | } | |
1506 | ||
1507 | switch (status) { | |
1afeaf5c TM |
1508 | case -ENOMEM: |
1509 | rpc_delay(task, HZ >> 2); | |
1da177e4 | 1510 | case -EAGAIN: /* woken up; retry */ |
ba60eb25 | 1511 | task->tk_action = call_retry_reserve; |
1da177e4 LT |
1512 | return; |
1513 | case -EIO: /* probably a shutdown */ | |
1514 | break; | |
1515 | default: | |
1516 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1517 | __func__, status); |
1da177e4 LT |
1518 | break; |
1519 | } | |
1520 | rpc_exit(task, status); | |
1521 | } | |
1522 | ||
ba60eb25 TM |
1523 | /* |
1524 | * 1c. Retry reserving an RPC call slot | |
1525 | */ | |
1526 | static void | |
1527 | call_retry_reserve(struct rpc_task *task) | |
1528 | { | |
1529 | dprint_status(task); | |
1530 | ||
1531 | task->tk_status = 0; | |
1532 | task->tk_action = call_reserveresult; | |
1533 | xprt_retry_reserve(task); | |
1534 | } | |
1535 | ||
1da177e4 | 1536 | /* |
55576244 BF |
1537 | * 2. Bind and/or refresh the credentials |
1538 | */ | |
1539 | static void | |
1540 | call_refresh(struct rpc_task *task) | |
1541 | { | |
1542 | dprint_status(task); | |
1543 | ||
1544 | task->tk_action = call_refreshresult; | |
1545 | task->tk_status = 0; | |
1546 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1547 | rpcauth_refreshcred(task); | |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * 2a. Process the results of a credential refresh | |
1552 | */ | |
1553 | static void | |
1554 | call_refreshresult(struct rpc_task *task) | |
1555 | { | |
1556 | int status = task->tk_status; | |
1557 | ||
1558 | dprint_status(task); | |
1559 | ||
1560 | task->tk_status = 0; | |
5fc43978 | 1561 | task->tk_action = call_refresh; |
55576244 | 1562 | switch (status) { |
5fc43978 | 1563 | case 0: |
6ff33b7d | 1564 | if (rpcauth_uptodatecred(task)) { |
5fc43978 | 1565 | task->tk_action = call_allocate; |
6ff33b7d WAA |
1566 | return; |
1567 | } | |
1568 | /* Use rate-limiting and a max number of retries if refresh | |
1569 | * had status 0 but failed to update the cred. | |
1570 | */ | |
55576244 BF |
1571 | case -ETIMEDOUT: |
1572 | rpc_delay(task, 3*HZ); | |
5fc43978 TM |
1573 | case -EAGAIN: |
1574 | status = -EACCES; | |
f1ff0c27 | 1575 | case -EKEYEXPIRED: |
5fc43978 TM |
1576 | if (!task->tk_cred_retry) |
1577 | break; | |
1578 | task->tk_cred_retry--; | |
1579 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1580 | task->tk_pid, __func__); | |
1581 | return; | |
55576244 | 1582 | } |
5fc43978 TM |
1583 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1584 | task->tk_pid, __func__, status); | |
1585 | rpc_exit(task, status); | |
55576244 BF |
1586 | } |
1587 | ||
1588 | /* | |
1589 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1590 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1591 | */ |
1592 | static void | |
1593 | call_allocate(struct rpc_task *task) | |
1594 | { | |
f2d47d02 | 1595 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 | 1596 | struct rpc_rqst *req = task->tk_rqstp; |
a4f0835c | 1597 | struct rpc_xprt *xprt = req->rq_xprt; |
2bea90d4 | 1598 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1599 | |
46121cf7 CL |
1600 | dprint_status(task); |
1601 | ||
2bea90d4 | 1602 | task->tk_status = 0; |
f2d47d02 | 1603 | task->tk_action = call_bind; |
2bea90d4 | 1604 | |
02107148 | 1605 | if (req->rq_buffer) |
1da177e4 LT |
1606 | return; |
1607 | ||
2bea90d4 CL |
1608 | if (proc->p_proc != 0) { |
1609 | BUG_ON(proc->p_arglen == 0); | |
1610 | if (proc->p_decode != NULL) | |
1611 | BUG_ON(proc->p_replen == 0); | |
1612 | } | |
1da177e4 | 1613 | |
2bea90d4 CL |
1614 | /* |
1615 | * Calculate the size (in quads) of the RPC call | |
1616 | * and reply headers, and convert both values | |
1617 | * to byte sizes. | |
1618 | */ | |
1619 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1620 | req->rq_callsize <<= 2; | |
1621 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1622 | req->rq_rcvsize <<= 2; | |
1623 | ||
c5a4dd8b CL |
1624 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1625 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1626 | if (req->rq_buffer != NULL) |
1da177e4 | 1627 | return; |
4a068258 | 1628 | xprt_inject_disconnect(xprt); |
46121cf7 CL |
1629 | |
1630 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1631 | |
5afa9133 | 1632 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1633 | task->tk_action = call_allocate; |
1da177e4 LT |
1634 | rpc_delay(task, HZ>>4); |
1635 | return; | |
1636 | } | |
1637 | ||
1638 | rpc_exit(task, -ERESTARTSYS); | |
1639 | } | |
1640 | ||
940e3318 TM |
1641 | static inline int |
1642 | rpc_task_need_encode(struct rpc_task *task) | |
1643 | { | |
1644 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1645 | } | |
1646 | ||
1647 | static inline void | |
1648 | rpc_task_force_reencode(struct rpc_task *task) | |
1649 | { | |
1650 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1651 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1652 | } |
1653 | ||
2bea90d4 CL |
1654 | static inline void |
1655 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1656 | { | |
1657 | buf->head[0].iov_base = start; | |
1658 | buf->head[0].iov_len = len; | |
1659 | buf->tail[0].iov_len = 0; | |
1660 | buf->page_len = 0; | |
4f22ccc3 | 1661 | buf->flags = 0; |
2bea90d4 CL |
1662 | buf->len = 0; |
1663 | buf->buflen = len; | |
1664 | } | |
1665 | ||
1da177e4 LT |
1666 | /* |
1667 | * 3. Encode arguments of an RPC call | |
1668 | */ | |
1669 | static void | |
b0e1c57e | 1670 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1671 | { |
1da177e4 | 1672 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1673 | kxdreproc_t encode; |
d8ed029d | 1674 | __be32 *p; |
1da177e4 | 1675 | |
46121cf7 | 1676 | dprint_status(task); |
1da177e4 | 1677 | |
2bea90d4 CL |
1678 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1679 | req->rq_buffer, | |
1680 | req->rq_callsize); | |
1681 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1682 | (char *)req->rq_buffer + req->rq_callsize, | |
1683 | req->rq_rcvsize); | |
1da177e4 | 1684 | |
b0e1c57e CL |
1685 | p = rpc_encode_header(task); |
1686 | if (p == NULL) { | |
1687 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1688 | rpc_exit(task, -EIO); |
1689 | return; | |
1690 | } | |
b0e1c57e CL |
1691 | |
1692 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1693 | if (encode == NULL) |
1694 | return; | |
1695 | ||
1696 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1697 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1698 | } |
1699 | ||
1700 | /* | |
1701 | * 4. Get the server port number if not yet set | |
1702 | */ | |
1703 | static void | |
1704 | call_bind(struct rpc_task *task) | |
1705 | { | |
ad2368d6 | 1706 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1707 | |
46121cf7 | 1708 | dprint_status(task); |
1da177e4 | 1709 | |
da351878 | 1710 | task->tk_action = call_connect; |
ec739ef0 | 1711 | if (!xprt_bound(xprt)) { |
da351878 | 1712 | task->tk_action = call_bind_status; |
ec739ef0 | 1713 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1714 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1715 | } |
1716 | } | |
1717 | ||
1718 | /* | |
da351878 CL |
1719 | * 4a. Sort out bind result |
1720 | */ | |
1721 | static void | |
1722 | call_bind_status(struct rpc_task *task) | |
1723 | { | |
906462af | 1724 | int status = -EIO; |
da351878 CL |
1725 | |
1726 | if (task->tk_status >= 0) { | |
46121cf7 | 1727 | dprint_status(task); |
da351878 CL |
1728 | task->tk_status = 0; |
1729 | task->tk_action = call_connect; | |
1730 | return; | |
1731 | } | |
1732 | ||
5753cba1 | 1733 | trace_rpc_bind_status(task); |
da351878 | 1734 | switch (task->tk_status) { |
381ba74a TM |
1735 | case -ENOMEM: |
1736 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1737 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1738 | goto retry_timeout; |
da351878 | 1739 | case -EACCES: |
46121cf7 CL |
1740 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1741 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1742 | /* fail immediately if this is an RPC ping */ |
1743 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1744 | status = -EOPNOTSUPP; | |
1745 | break; | |
1746 | } | |
0b760113 TM |
1747 | if (task->tk_rebind_retry == 0) |
1748 | break; | |
1749 | task->tk_rebind_retry--; | |
ea635a51 | 1750 | rpc_delay(task, 3*HZ); |
da45828e | 1751 | goto retry_timeout; |
da351878 | 1752 | case -ETIMEDOUT: |
46121cf7 | 1753 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1754 | task->tk_pid); |
da45828e | 1755 | goto retry_timeout; |
da351878 | 1756 | case -EPFNOSUPPORT: |
906462af | 1757 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1758 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1759 | task->tk_pid); |
1760 | break; | |
1761 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1762 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1763 | task->tk_pid); |
fdb63dcd | 1764 | goto retry_timeout; |
012da158 CL |
1765 | case -ECONNREFUSED: /* connection problems */ |
1766 | case -ECONNRESET: | |
df277270 | 1767 | case -ECONNABORTED: |
012da158 CL |
1768 | case -ENOTCONN: |
1769 | case -EHOSTDOWN: | |
1770 | case -EHOSTUNREACH: | |
1771 | case -ENETUNREACH: | |
3601c4a9 | 1772 | case -ENOBUFS: |
012da158 CL |
1773 | case -EPIPE: |
1774 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1775 | task->tk_pid, task->tk_status); | |
1776 | if (!RPC_IS_SOFTCONN(task)) { | |
1777 | rpc_delay(task, 5*HZ); | |
1778 | goto retry_timeout; | |
1779 | } | |
1780 | status = task->tk_status; | |
1781 | break; | |
da351878 | 1782 | default: |
46121cf7 | 1783 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1784 | task->tk_pid, -task->tk_status); |
da351878 CL |
1785 | } |
1786 | ||
1787 | rpc_exit(task, status); | |
1788 | return; | |
1789 | ||
da45828e | 1790 | retry_timeout: |
fdb63dcd | 1791 | task->tk_status = 0; |
da45828e | 1792 | task->tk_action = call_timeout; |
da351878 CL |
1793 | } |
1794 | ||
1795 | /* | |
1796 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1797 | */ |
1798 | static void | |
1799 | call_connect(struct rpc_task *task) | |
1800 | { | |
ad2368d6 | 1801 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1802 | |
46121cf7 | 1803 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1804 | task->tk_pid, xprt, |
1805 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1806 | |
da351878 CL |
1807 | task->tk_action = call_transmit; |
1808 | if (!xprt_connected(xprt)) { | |
1809 | task->tk_action = call_connect_status; | |
1810 | if (task->tk_status < 0) | |
1811 | return; | |
786615bc TM |
1812 | if (task->tk_flags & RPC_TASK_NOCONNECT) { |
1813 | rpc_exit(task, -ENOTCONN); | |
1814 | return; | |
1815 | } | |
da351878 | 1816 | xprt_connect(task); |
1da177e4 | 1817 | } |
1da177e4 LT |
1818 | } |
1819 | ||
1820 | /* | |
da351878 | 1821 | * 4c. Sort out connect result |
1da177e4 LT |
1822 | */ |
1823 | static void | |
1824 | call_connect_status(struct rpc_task *task) | |
1825 | { | |
1826 | struct rpc_clnt *clnt = task->tk_client; | |
1827 | int status = task->tk_status; | |
1828 | ||
46121cf7 | 1829 | dprint_status(task); |
da351878 | 1830 | |
5753cba1 | 1831 | trace_rpc_connect_status(task, status); |
561ec160 | 1832 | task->tk_status = 0; |
1da177e4 | 1833 | switch (status) { |
3ed5e2a2 TM |
1834 | case -ECONNREFUSED: |
1835 | case -ECONNRESET: | |
df277270 | 1836 | case -ECONNABORTED: |
3ed5e2a2 | 1837 | case -ENETUNREACH: |
df277270 | 1838 | case -EHOSTUNREACH: |
3913c78c | 1839 | case -EADDRINUSE: |
3601c4a9 | 1840 | case -ENOBUFS: |
2fc193cf | 1841 | case -EPIPE: |
3ed5e2a2 TM |
1842 | if (RPC_IS_SOFTCONN(task)) |
1843 | break; | |
1fa3e2eb SD |
1844 | /* retry with existing socket, after a delay */ |
1845 | rpc_delay(task, 3*HZ); | |
3ed5e2a2 | 1846 | case -EAGAIN: |
485f2251 TM |
1847 | /* Check for timeouts before looping back to call_bind */ |
1848 | case -ETIMEDOUT: | |
1849 | task->tk_action = call_timeout; | |
561ec160 TM |
1850 | return; |
1851 | case 0: | |
3ed5e2a2 TM |
1852 | clnt->cl_stats->netreconn++; |
1853 | task->tk_action = call_transmit; | |
1854 | return; | |
1da177e4 | 1855 | } |
3ed5e2a2 | 1856 | rpc_exit(task, status); |
1da177e4 LT |
1857 | } |
1858 | ||
1859 | /* | |
1860 | * 5. Transmit the RPC request, and wait for reply | |
1861 | */ | |
1862 | static void | |
1863 | call_transmit(struct rpc_task *task) | |
1864 | { | |
ca7f33aa TM |
1865 | int is_retrans = RPC_WAS_SENT(task); |
1866 | ||
46121cf7 | 1867 | dprint_status(task); |
1da177e4 LT |
1868 | |
1869 | task->tk_action = call_status; | |
1870 | if (task->tk_status < 0) | |
1871 | return; | |
90051ea7 | 1872 | if (!xprt_prepare_transmit(task)) |
1da177e4 | 1873 | return; |
e0ab53de | 1874 | task->tk_action = call_transmit_status; |
1da177e4 | 1875 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1876 | if (rpc_task_need_encode(task)) { |
b0e1c57e | 1877 | rpc_xdr_encode(task); |
5e5ce5be | 1878 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1879 | if (task->tk_status != 0) { |
1880 | /* Was the error nonfatal? */ | |
1881 | if (task->tk_status == -EAGAIN) | |
1882 | rpc_delay(task, HZ >> 4); | |
1883 | else | |
1884 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1885 | return; |
8b39f2b4 | 1886 | } |
5e5ce5be | 1887 | } |
1da177e4 LT |
1888 | xprt_transmit(task); |
1889 | if (task->tk_status < 0) | |
1890 | return; | |
ca7f33aa TM |
1891 | if (is_retrans) |
1892 | task->tk_client->cl_stats->rpcretrans++; | |
e0ab53de TM |
1893 | /* |
1894 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1895 | * in order to allow access to the socket to other RPC requests. | |
1896 | */ | |
1897 | call_transmit_status(task); | |
55ae1aab | 1898 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1899 | return; |
1900 | task->tk_action = rpc_exit_task; | |
a4f0835c | 1901 | rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task); |
e0ab53de TM |
1902 | } |
1903 | ||
1904 | /* | |
1905 | * 5a. Handle cleanup after a transmission | |
1906 | */ | |
1907 | static void | |
1908 | call_transmit_status(struct rpc_task *task) | |
1909 | { | |
1910 | task->tk_action = call_status; | |
206a134b CL |
1911 | |
1912 | /* | |
1913 | * Common case: success. Force the compiler to put this | |
1914 | * test first. | |
1915 | */ | |
1916 | if (task->tk_status == 0) { | |
1917 | xprt_end_transmit(task); | |
1918 | rpc_task_force_reencode(task); | |
1919 | return; | |
1920 | } | |
1921 | ||
15f081ca TM |
1922 | switch (task->tk_status) { |
1923 | case -EAGAIN: | |
93aa6c7b | 1924 | case -ENOBUFS: |
15f081ca TM |
1925 | break; |
1926 | default: | |
206a134b | 1927 | dprint_status(task); |
15f081ca | 1928 | xprt_end_transmit(task); |
09a21c41 CL |
1929 | rpc_task_force_reencode(task); |
1930 | break; | |
15f081ca TM |
1931 | /* |
1932 | * Special cases: if we've been waiting on the | |
1933 | * socket's write_space() callback, or if the | |
1934 | * socket just returned a connection error, | |
1935 | * then hold onto the transport lock. | |
1936 | */ | |
1937 | case -ECONNREFUSED: | |
15f081ca TM |
1938 | case -EHOSTDOWN: |
1939 | case -EHOSTUNREACH: | |
1940 | case -ENETUNREACH: | |
3dedbb5c | 1941 | case -EPERM: |
09a21c41 CL |
1942 | if (RPC_IS_SOFTCONN(task)) { |
1943 | xprt_end_transmit(task); | |
1944 | rpc_exit(task, task->tk_status); | |
1945 | break; | |
1946 | } | |
1947 | case -ECONNRESET: | |
df277270 | 1948 | case -ECONNABORTED: |
3913c78c | 1949 | case -EADDRINUSE: |
09a21c41 | 1950 | case -ENOTCONN: |
c8485e4d | 1951 | case -EPIPE: |
15f081ca TM |
1952 | rpc_task_force_reencode(task); |
1953 | } | |
1da177e4 LT |
1954 | } |
1955 | ||
9e00abc3 | 1956 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1957 | /* |
1958 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1959 | * addition, disconnect on connectivity errors. | |
1960 | */ | |
1961 | static void | |
1962 | call_bc_transmit(struct rpc_task *task) | |
1963 | { | |
1964 | struct rpc_rqst *req = task->tk_rqstp; | |
1965 | ||
1193d58f TM |
1966 | if (!xprt_prepare_transmit(task)) |
1967 | goto out_retry; | |
55ae1aab | 1968 | |
55ae1aab RL |
1969 | if (task->tk_status < 0) { |
1970 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1971 | "error: %d\n", task->tk_status); | |
1193d58f | 1972 | goto out_done; |
55ae1aab | 1973 | } |
1193d58f TM |
1974 | if (req->rq_connect_cookie != req->rq_xprt->connect_cookie) |
1975 | req->rq_bytes_sent = 0; | |
55ae1aab RL |
1976 | |
1977 | xprt_transmit(task); | |
1193d58f TM |
1978 | |
1979 | if (task->tk_status == -EAGAIN) | |
1980 | goto out_nospace; | |
1981 | ||
55ae1aab RL |
1982 | xprt_end_transmit(task); |
1983 | dprint_status(task); | |
1984 | switch (task->tk_status) { | |
1985 | case 0: | |
1986 | /* Success */ | |
55ae1aab RL |
1987 | case -EHOSTDOWN: |
1988 | case -EHOSTUNREACH: | |
1989 | case -ENETUNREACH: | |
3832591e TM |
1990 | case -ECONNRESET: |
1991 | case -ECONNREFUSED: | |
1992 | case -EADDRINUSE: | |
1993 | case -ENOTCONN: | |
1994 | case -EPIPE: | |
1995 | break; | |
55ae1aab RL |
1996 | case -ETIMEDOUT: |
1997 | /* | |
1998 | * Problem reaching the server. Disconnect and let the | |
1999 | * forechannel reestablish the connection. The server will | |
2000 | * have to retransmit the backchannel request and we'll | |
2001 | * reprocess it. Since these ops are idempotent, there's no | |
2002 | * need to cache our reply at this time. | |
2003 | */ | |
2004 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
2005 | "error: %d\n", task->tk_status); | |
a4f0835c | 2006 | xprt_conditional_disconnect(req->rq_xprt, |
55ae1aab RL |
2007 | req->rq_connect_cookie); |
2008 | break; | |
2009 | default: | |
2010 | /* | |
2011 | * We were unable to reply and will have to drop the | |
2012 | * request. The server should reconnect and retransmit. | |
2013 | */ | |
1facf4c4 | 2014 | WARN_ON_ONCE(task->tk_status == -EAGAIN); |
55ae1aab RL |
2015 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
2016 | "error: %d\n", task->tk_status); | |
2017 | break; | |
2018 | } | |
2019 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1193d58f TM |
2020 | out_done: |
2021 | task->tk_action = rpc_exit_task; | |
2022 | return; | |
2023 | out_nospace: | |
2024 | req->rq_connect_cookie = req->rq_xprt->connect_cookie; | |
2025 | out_retry: | |
2026 | task->tk_status = 0; | |
55ae1aab | 2027 | } |
9e00abc3 | 2028 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 2029 | |
1da177e4 LT |
2030 | /* |
2031 | * 6. Sort out the RPC call status | |
2032 | */ | |
2033 | static void | |
2034 | call_status(struct rpc_task *task) | |
2035 | { | |
2036 | struct rpc_clnt *clnt = task->tk_client; | |
2037 | struct rpc_rqst *req = task->tk_rqstp; | |
2038 | int status; | |
2039 | ||
dd2b63d0 RL |
2040 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
2041 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 2042 | |
46121cf7 | 2043 | dprint_status(task); |
1da177e4 LT |
2044 | |
2045 | status = task->tk_status; | |
2046 | if (status >= 0) { | |
2047 | task->tk_action = call_decode; | |
2048 | return; | |
2049 | } | |
2050 | ||
5753cba1 | 2051 | trace_rpc_call_status(task); |
1da177e4 LT |
2052 | task->tk_status = 0; |
2053 | switch(status) { | |
76303992 TM |
2054 | case -EHOSTDOWN: |
2055 | case -EHOSTUNREACH: | |
2056 | case -ENETUNREACH: | |
3dedbb5c | 2057 | case -EPERM: |
9455e3f4 TM |
2058 | if (RPC_IS_SOFTCONN(task)) { |
2059 | rpc_exit(task, status); | |
2060 | break; | |
2061 | } | |
76303992 TM |
2062 | /* |
2063 | * Delay any retries for 3 seconds, then handle as if it | |
2064 | * were a timeout. | |
2065 | */ | |
2066 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
2067 | case -ETIMEDOUT: |
2068 | task->tk_action = call_timeout; | |
8a19a0b6 TM |
2069 | if (!(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) |
2070 | && task->tk_client->cl_discrtry) | |
a4f0835c | 2071 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2072 | req->rq_connect_cookie); |
1da177e4 LT |
2073 | break; |
2074 | case -ECONNREFUSED: | |
df277270 TM |
2075 | case -ECONNRESET: |
2076 | case -ECONNABORTED: | |
35f5a422 | 2077 | rpc_force_rebind(clnt); |
3913c78c | 2078 | case -EADDRINUSE: |
c8485e4d TM |
2079 | rpc_delay(task, 3*HZ); |
2080 | case -EPIPE: | |
2081 | case -ENOTCONN: | |
1da177e4 LT |
2082 | task->tk_action = call_bind; |
2083 | break; | |
93aa6c7b TM |
2084 | case -ENOBUFS: |
2085 | rpc_delay(task, HZ>>2); | |
1da177e4 LT |
2086 | case -EAGAIN: |
2087 | task->tk_action = call_transmit; | |
2088 | break; | |
2089 | case -EIO: | |
2090 | /* shutdown or soft timeout */ | |
2091 | rpc_exit(task, status); | |
2092 | break; | |
2093 | default: | |
b6b6152c OK |
2094 | if (clnt->cl_chatty) |
2095 | printk("%s: RPC call returned error %d\n", | |
55909f21 | 2096 | clnt->cl_program->name, -status); |
1da177e4 | 2097 | rpc_exit(task, status); |
1da177e4 LT |
2098 | } |
2099 | } | |
2100 | ||
2101 | /* | |
e0ab53de | 2102 | * 6a. Handle RPC timeout |
1da177e4 LT |
2103 | * We do not release the request slot, so we keep using the |
2104 | * same XID for all retransmits. | |
2105 | */ | |
2106 | static void | |
2107 | call_timeout(struct rpc_task *task) | |
2108 | { | |
2109 | struct rpc_clnt *clnt = task->tk_client; | |
2110 | ||
2111 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 2112 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
2113 | goto retry; |
2114 | } | |
2115 | ||
46121cf7 | 2116 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
2117 | task->tk_timeouts++; |
2118 | ||
3a28becc CL |
2119 | if (RPC_IS_SOFTCONN(task)) { |
2120 | rpc_exit(task, -ETIMEDOUT); | |
2121 | return; | |
2122 | } | |
1da177e4 | 2123 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 2124 | if (clnt->cl_chatty) { |
4e0038b6 | 2125 | rcu_read_lock(); |
b6b6152c | 2126 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
55909f21 | 2127 | clnt->cl_program->name, |
4e0038b6 TM |
2128 | rcu_dereference(clnt->cl_xprt)->servername); |
2129 | rcu_read_unlock(); | |
cac5d07e | 2130 | } |
7494d00c TM |
2131 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
2132 | rpc_exit(task, -ETIMEDOUT); | |
2133 | else | |
2134 | rpc_exit(task, -EIO); | |
1da177e4 LT |
2135 | return; |
2136 | } | |
2137 | ||
f518e35a | 2138 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 2139 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
2140 | if (clnt->cl_chatty) { |
2141 | rcu_read_lock(); | |
b6b6152c | 2142 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
55909f21 | 2143 | clnt->cl_program->name, |
4e0038b6 TM |
2144 | rcu_dereference(clnt->cl_xprt)->servername); |
2145 | rcu_read_unlock(); | |
2146 | } | |
1da177e4 | 2147 | } |
35f5a422 | 2148 | rpc_force_rebind(clnt); |
b48633bd TM |
2149 | /* |
2150 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
2151 | * event? RFC2203 requires the server to drop all such requests. | |
2152 | */ | |
2153 | rpcauth_invalcred(task); | |
1da177e4 LT |
2154 | |
2155 | retry: | |
1da177e4 LT |
2156 | task->tk_action = call_bind; |
2157 | task->tk_status = 0; | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * 7. Decode the RPC reply | |
2162 | */ | |
2163 | static void | |
2164 | call_decode(struct rpc_task *task) | |
2165 | { | |
2166 | struct rpc_clnt *clnt = task->tk_client; | |
2167 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 2168 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 2169 | __be32 *p; |
1da177e4 | 2170 | |
726fd6ad | 2171 | dprint_status(task); |
1da177e4 | 2172 | |
f518e35a | 2173 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
2174 | if (clnt->cl_chatty) { |
2175 | rcu_read_lock(); | |
b6b6152c | 2176 | printk(KERN_NOTICE "%s: server %s OK\n", |
55909f21 | 2177 | clnt->cl_program->name, |
4e0038b6 TM |
2178 | rcu_dereference(clnt->cl_xprt)->servername); |
2179 | rcu_read_unlock(); | |
2180 | } | |
1da177e4 LT |
2181 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
2182 | } | |
2183 | ||
43ac3f29 TM |
2184 | /* |
2185 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 2186 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
2187 | */ |
2188 | smp_rmb(); | |
1da177e4 LT |
2189 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
2190 | ||
2191 | /* Check that the softirq receive buffer is valid */ | |
2192 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
2193 | sizeof(req->rq_rcv_buf)) != 0); | |
2194 | ||
1e799b67 TM |
2195 | if (req->rq_rcv_buf.len < 12) { |
2196 | if (!RPC_IS_SOFT(task)) { | |
2197 | task->tk_action = call_bind; | |
1e799b67 TM |
2198 | goto out_retry; |
2199 | } | |
2200 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
55909f21 | 2201 | clnt->cl_program->name, task->tk_status); |
1e799b67 TM |
2202 | task->tk_action = call_timeout; |
2203 | goto out_retry; | |
2204 | } | |
2205 | ||
b0e1c57e | 2206 | p = rpc_verify_header(task); |
abbcf28f TM |
2207 | if (IS_ERR(p)) { |
2208 | if (p == ERR_PTR(-EAGAIN)) | |
2209 | goto out_retry; | |
2210 | return; | |
1da177e4 LT |
2211 | } |
2212 | ||
abbcf28f | 2213 | task->tk_action = rpc_exit_task; |
1da177e4 | 2214 | |
6d5fcb5a | 2215 | if (decode) { |
1da177e4 LT |
2216 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
2217 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 2218 | } |
46121cf7 CL |
2219 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
2220 | task->tk_status); | |
1da177e4 LT |
2221 | return; |
2222 | out_retry: | |
1da177e4 | 2223 | task->tk_status = 0; |
b0e1c57e | 2224 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 2225 | if (task->tk_rqstp == req) { |
dd2b63d0 | 2226 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 2227 | if (task->tk_client->cl_discrtry) |
a4f0835c | 2228 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2229 | req->rq_connect_cookie); |
24b74bf0 | 2230 | } |
1da177e4 LT |
2231 | } |
2232 | ||
d8ed029d | 2233 | static __be32 * |
b0e1c57e | 2234 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
2235 | { |
2236 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2237 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 2238 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
2239 | |
2240 | /* FIXME: check buffer size? */ | |
808012fb | 2241 | |
a4f0835c | 2242 | p = xprt_skip_transport_header(req->rq_xprt, p); |
1da177e4 LT |
2243 | *p++ = req->rq_xid; /* XID */ |
2244 | *p++ = htonl(RPC_CALL); /* CALL */ | |
2245 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
2246 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
2247 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
2248 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
2249 | p = rpcauth_marshcred(task, p); |
2250 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
2251 | return p; | |
1da177e4 LT |
2252 | } |
2253 | ||
d8ed029d | 2254 | static __be32 * |
b0e1c57e | 2255 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 2256 | { |
4e0038b6 | 2257 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
2258 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
2259 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
2260 | __be32 *p = iov->iov_base; |
2261 | u32 n; | |
1da177e4 LT |
2262 | int error = -EACCES; |
2263 | ||
e8896495 DH |
2264 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
2265 | /* RFC-1014 says that the representation of XDR data must be a | |
2266 | * multiple of four bytes | |
2267 | * - if it isn't pointer subtraction in the NFS client may give | |
2268 | * undefined results | |
2269 | */ | |
8a702bbb | 2270 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2271 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2272 | task->tk_rqstp->rq_rcv_buf.len); |
35fa5f7b AA |
2273 | error = -EIO; |
2274 | goto out_err; | |
e8896495 | 2275 | } |
1da177e4 LT |
2276 | if ((len -= 3) < 0) |
2277 | goto out_overflow; | |
1da177e4 | 2278 | |
f4a2e418 | 2279 | p += 1; /* skip XID */ |
1da177e4 | 2280 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2281 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2282 | task->tk_pid, __func__, n); |
35fa5f7b | 2283 | error = -EIO; |
abbcf28f | 2284 | goto out_garbage; |
1da177e4 | 2285 | } |
f4a2e418 | 2286 | |
1da177e4 LT |
2287 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2288 | if (--len < 0) | |
2289 | goto out_overflow; | |
2290 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2291 | case RPC_AUTH_ERROR: |
2292 | break; | |
2293 | case RPC_MISMATCH: | |
2294 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2295 | task->tk_pid, __func__); | |
2296 | error = -EPROTONOSUPPORT; | |
2297 | goto out_err; | |
2298 | default: | |
2299 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2300 | "unknown error: %x\n", | |
2301 | task->tk_pid, __func__, n); | |
35fa5f7b AA |
2302 | error = -EIO; |
2303 | goto out_err; | |
1da177e4 LT |
2304 | } |
2305 | if (--len < 0) | |
2306 | goto out_overflow; | |
2307 | switch ((n = ntohl(*p++))) { | |
2308 | case RPC_AUTH_REJECTEDCRED: | |
2309 | case RPC_AUTH_REJECTEDVERF: | |
2310 | case RPCSEC_GSS_CREDPROBLEM: | |
2311 | case RPCSEC_GSS_CTXPROBLEM: | |
2312 | if (!task->tk_cred_retry) | |
2313 | break; | |
2314 | task->tk_cred_retry--; | |
46121cf7 | 2315 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2316 | task->tk_pid, __func__); |
1da177e4 | 2317 | rpcauth_invalcred(task); |
220bcc2a TM |
2318 | /* Ensure we obtain a new XID! */ |
2319 | xprt_release(task); | |
118df3d1 | 2320 | task->tk_action = call_reserve; |
abbcf28f | 2321 | goto out_retry; |
1da177e4 LT |
2322 | case RPC_AUTH_BADCRED: |
2323 | case RPC_AUTH_BADVERF: | |
2324 | /* possibly garbled cred/verf? */ | |
2325 | if (!task->tk_garb_retry) | |
2326 | break; | |
2327 | task->tk_garb_retry--; | |
46121cf7 | 2328 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2329 | task->tk_pid, __func__); |
1da177e4 | 2330 | task->tk_action = call_bind; |
abbcf28f | 2331 | goto out_retry; |
1da177e4 | 2332 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2333 | rcu_read_lock(); |
b0e1c57e | 2334 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2335 | "authentication.\n", |
2336 | rcu_dereference(clnt->cl_xprt)->servername); | |
2337 | rcu_read_unlock(); | |
1da177e4 LT |
2338 | break; |
2339 | default: | |
8a702bbb | 2340 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2341 | task->tk_pid, __func__, n); |
1da177e4 LT |
2342 | error = -EIO; |
2343 | } | |
46121cf7 | 2344 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2345 | task->tk_pid, __func__, n); |
1da177e4 LT |
2346 | goto out_err; |
2347 | } | |
35fa5f7b AA |
2348 | p = rpcauth_checkverf(task, p); |
2349 | if (IS_ERR(p)) { | |
2350 | error = PTR_ERR(p); | |
2351 | dprintk("RPC: %5u %s: auth check failed with %d\n", | |
2352 | task->tk_pid, __func__, error); | |
abbcf28f | 2353 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2354 | } |
d8ed029d | 2355 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2356 | if (len < 0) |
2357 | goto out_overflow; | |
2358 | switch ((n = ntohl(*p++))) { | |
2359 | case RPC_SUCCESS: | |
2360 | return p; | |
2361 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2362 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2363 | "by server %s\n", task->tk_pid, __func__, | |
2364 | (unsigned int)clnt->cl_prog, | |
2365 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2366 | error = -EPFNOSUPPORT; |
2367 | goto out_err; | |
1da177e4 | 2368 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2369 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2370 | "by server %s\n", task->tk_pid, __func__, | |
2371 | (unsigned int)clnt->cl_prog, | |
2372 | (unsigned int)clnt->cl_vers, | |
2373 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2374 | error = -EPROTONOSUPPORT; |
2375 | goto out_err; | |
1da177e4 | 2376 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2377 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2378 | "version %u on server %s\n", |
0dc47877 | 2379 | task->tk_pid, __func__, |
3748f1e4 | 2380 | rpc_proc_name(task), |
4e0038b6 TM |
2381 | clnt->cl_prog, clnt->cl_vers, |
2382 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2383 | error = -EOPNOTSUPP; |
2384 | goto out_err; | |
1da177e4 | 2385 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2386 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2387 | task->tk_pid, __func__); |
1da177e4 LT |
2388 | break; /* retry */ |
2389 | default: | |
8a702bbb | 2390 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2391 | task->tk_pid, __func__, n); |
1da177e4 LT |
2392 | /* Also retry */ |
2393 | } | |
2394 | ||
abbcf28f | 2395 | out_garbage: |
4e0038b6 | 2396 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2397 | if (task->tk_garb_retry) { |
2398 | task->tk_garb_retry--; | |
46121cf7 | 2399 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2400 | task->tk_pid, __func__); |
1da177e4 | 2401 | task->tk_action = call_bind; |
abbcf28f TM |
2402 | out_retry: |
2403 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2404 | } |
1da177e4 LT |
2405 | out_err: |
2406 | rpc_exit(task, error); | |
8a702bbb | 2407 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2408 | __func__, error); |
abbcf28f | 2409 | return ERR_PTR(error); |
1da177e4 | 2410 | out_overflow: |
8a702bbb | 2411 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2412 | __func__); |
abbcf28f | 2413 | goto out_garbage; |
1da177e4 | 2414 | } |
5ee0ed7d | 2415 | |
9f06c719 | 2416 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2417 | { |
5ee0ed7d TM |
2418 | } |
2419 | ||
bf269551 | 2420 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2421 | { |
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | static struct rpc_procinfo rpcproc_null = { | |
2426 | .p_encode = rpcproc_encode_null, | |
2427 | .p_decode = rpcproc_decode_null, | |
2428 | }; | |
2429 | ||
caabea8a | 2430 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2431 | { |
2432 | struct rpc_message msg = { | |
2433 | .rpc_proc = &rpcproc_null, | |
2434 | }; | |
2435 | int err; | |
2436 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2437 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2438 | put_rpccred(msg.rpc_cred); |
2439 | return err; | |
2440 | } | |
188fef11 | 2441 | |
5e1550d6 TM |
2442 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2443 | { | |
2444 | struct rpc_message msg = { | |
2445 | .rpc_proc = &rpcproc_null, | |
2446 | .rpc_cred = cred, | |
2447 | }; | |
84115e1c TM |
2448 | struct rpc_task_setup task_setup_data = { |
2449 | .rpc_client = clnt, | |
2450 | .rpc_message = &msg, | |
2451 | .callback_ops = &rpc_default_ops, | |
2452 | .flags = flags, | |
2453 | }; | |
c970aa85 | 2454 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2455 | } |
e8914c65 | 2456 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2457 | |
f895b252 | 2458 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
68a23ee9 CL |
2459 | static void rpc_show_header(void) |
2460 | { | |
cb3997b5 CL |
2461 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2462 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2463 | } |
2464 | ||
38e886e0 CL |
2465 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2466 | const struct rpc_task *task) | |
2467 | { | |
2468 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2469 | |
2470 | if (RPC_IS_QUEUED(task)) | |
2471 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2472 | ||
b3bcedad | 2473 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2474 | task->tk_pid, task->tk_flags, task->tk_status, |
2475 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
55909f21 | 2476 | clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), |
b3bcedad | 2477 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2478 | } |
2479 | ||
70abc49b | 2480 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2481 | { |
2482 | struct rpc_clnt *clnt; | |
38e886e0 | 2483 | struct rpc_task *task; |
68a23ee9 | 2484 | int header = 0; |
70abc49b | 2485 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2486 | |
70abc49b SK |
2487 | spin_lock(&sn->rpc_client_lock); |
2488 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2489 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2490 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2491 | if (!header) { |
2492 | rpc_show_header(); | |
2493 | header++; | |
2494 | } | |
38e886e0 | 2495 | rpc_show_task(clnt, task); |
188fef11 TM |
2496 | } |
2497 | spin_unlock(&clnt->cl_lock); | |
2498 | } | |
70abc49b | 2499 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2500 | } |
2501 | #endif | |
3c87ef6e JL |
2502 | |
2503 | #if IS_ENABLED(CONFIG_SUNRPC_SWAP) | |
2504 | int | |
2505 | rpc_clnt_swap_activate(struct rpc_clnt *clnt) | |
2506 | { | |
2507 | int ret = 0; | |
2508 | struct rpc_xprt *xprt; | |
2509 | ||
2510 | if (atomic_inc_return(&clnt->cl_swapper) == 1) { | |
2511 | retry: | |
2512 | rcu_read_lock(); | |
2513 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
2514 | rcu_read_unlock(); | |
2515 | if (!xprt) { | |
2516 | /* | |
2517 | * If we didn't get a reference, then we likely are | |
2518 | * racing with a migration event. Wait for a grace | |
2519 | * period and try again. | |
2520 | */ | |
2521 | synchronize_rcu(); | |
2522 | goto retry; | |
2523 | } | |
2524 | ||
d67fa4d8 | 2525 | ret = xprt_enable_swap(xprt); |
3c87ef6e JL |
2526 | xprt_put(xprt); |
2527 | } | |
2528 | return ret; | |
2529 | } | |
2530 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate); | |
2531 | ||
2532 | void | |
2533 | rpc_clnt_swap_deactivate(struct rpc_clnt *clnt) | |
2534 | { | |
2535 | struct rpc_xprt *xprt; | |
2536 | ||
2537 | if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) { | |
2538 | retry: | |
2539 | rcu_read_lock(); | |
2540 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
2541 | rcu_read_unlock(); | |
2542 | if (!xprt) { | |
2543 | /* | |
2544 | * If we didn't get a reference, then we likely are | |
2545 | * racing with a migration event. Wait for a grace | |
2546 | * period and try again. | |
2547 | */ | |
2548 | synchronize_rcu(); | |
2549 | goto retry; | |
2550 | } | |
2551 | ||
d67fa4d8 | 2552 | xprt_disable_swap(xprt); |
3c87ef6e JL |
2553 | xprt_put(xprt); |
2554 | } | |
2555 | } | |
2556 | EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate); | |
2557 | #endif /* CONFIG_SUNRPC_SWAP */ |