1 /* 2 * linux/net/sunrpc/clnt.c 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 * 16 * NB: BSD uses a more intelligent approach to guessing when a request 17 * or reply has been lost by keeping the RTO estimate for each procedure. 18 * We currently make do with a constant timeout value. 19 * 20 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> 21 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> 22 */ 23 24 #include <asm/system.h> 25 26 #include <linux/module.h> 27 #include <linux/types.h> 28 #include <linux/mm.h> 29 #include <linux/slab.h> 30 #include <linux/smp_lock.h> 31 #include <linux/utsname.h> 32 #include <linux/workqueue.h> 33 #include <linux/in6.h> 34 35 #include <linux/sunrpc/clnt.h> 36 #include <linux/sunrpc/rpc_pipe_fs.h> 37 #include <linux/sunrpc/metrics.h> 38 39 40 #ifdef RPC_DEBUG 41 # define RPCDBG_FACILITY RPCDBG_CALL 42 #endif 43 44 #define dprint_status(t) \ 45 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ 46 __FUNCTION__, t->tk_status) 47 48 /* 49 * All RPC clients are linked into this list 50 */ 51 static LIST_HEAD(all_clients); 52 static DEFINE_SPINLOCK(rpc_client_lock); 53 54 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); 55 56 57 static void call_start(struct rpc_task *task); 58 static void call_reserve(struct rpc_task *task); 59 static void call_reserveresult(struct rpc_task *task); 60 static void call_allocate(struct rpc_task *task); 61 static void call_encode(struct rpc_task *task); 62 static void call_decode(struct rpc_task *task); 63 static void call_bind(struct rpc_task *task); 64 static void call_bind_status(struct rpc_task *task); 65 static void call_transmit(struct rpc_task *task); 66 static void call_status(struct rpc_task *task); 67 static void call_transmit_status(struct rpc_task *task); 68 static void call_refresh(struct rpc_task *task); 69 static void call_refreshresult(struct rpc_task *task); 70 static void call_timeout(struct rpc_task *task); 71 static void call_connect(struct rpc_task *task); 72 static void call_connect_status(struct rpc_task *task); 73 static __be32 * call_header(struct rpc_task *task); 74 static __be32 * call_verify(struct rpc_task *task); 75 76 static int rpc_ping(struct rpc_clnt *clnt, int flags); 77 78 static void rpc_register_client(struct rpc_clnt *clnt) 79 { 80 spin_lock(&rpc_client_lock); 81 list_add(&clnt->cl_clients, &all_clients); 82 spin_unlock(&rpc_client_lock); 83 } 84 85 static void rpc_unregister_client(struct rpc_clnt *clnt) 86 { 87 spin_lock(&rpc_client_lock); 88 list_del(&clnt->cl_clients); 89 spin_unlock(&rpc_client_lock); 90 } 91 92 static int 93 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) 94 { 95 static uint32_t clntid; 96 int error; 97 98 clnt->cl_vfsmnt = ERR_PTR(-ENOENT); 99 clnt->cl_dentry = ERR_PTR(-ENOENT); 100 if (dir_name == NULL) 101 return 0; 102 103 clnt->cl_vfsmnt = rpc_get_mount(); 104 if (IS_ERR(clnt->cl_vfsmnt)) 105 return PTR_ERR(clnt->cl_vfsmnt); 106 107 for (;;) { 108 snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), 109 "%s/clnt%x", dir_name, 110 (unsigned int)clntid++); 111 clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; 112 clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); 113 if (!IS_ERR(clnt->cl_dentry)) 114 return 0; 115 error = PTR_ERR(clnt->cl_dentry); 116 if (error != -EEXIST) { 117 printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", 118 clnt->cl_pathname, error); 119 rpc_put_mount(); 120 return error; 121 } 122 } 123 } 124 125 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) 126 { 127 struct rpc_program *program = args->program; 128 struct rpc_version *version; 129 struct rpc_clnt *clnt = NULL; 130 struct rpc_auth *auth; 131 int err; 132 size_t len; 133 134 /* sanity check the name before trying to print it */ 135 err = -EINVAL; 136 len = strlen(args->servername); 137 if (len > RPC_MAXNETNAMELEN) 138 goto out_no_rpciod; 139 len++; 140 141 dprintk("RPC: creating %s client for %s (xprt %p)\n", 142 program->name, args->servername, xprt); 143 144 err = rpciod_up(); 145 if (err) 146 goto out_no_rpciod; 147 err = -EINVAL; 148 if (!xprt) 149 goto out_no_xprt; 150 151 if (args->version >= program->nrvers) 152 goto out_err; 153 version = program->version[args->version]; 154 if (version == NULL) 155 goto out_err; 156 157 err = -ENOMEM; 158 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); 159 if (!clnt) 160 goto out_err; 161 clnt->cl_parent = clnt; 162 163 clnt->cl_server = clnt->cl_inline_name; 164 if (len > sizeof(clnt->cl_inline_name)) { 165 char *buf = kmalloc(len, GFP_KERNEL); 166 if (buf != NULL) 167 clnt->cl_server = buf; 168 else 169 len = sizeof(clnt->cl_inline_name); 170 } 171 strlcpy(clnt->cl_server, args->servername, len); 172 173 clnt->cl_xprt = xprt; 174 clnt->cl_procinfo = version->procs; 175 clnt->cl_maxproc = version->nrprocs; 176 clnt->cl_protname = program->name; 177 clnt->cl_prog = program->number; 178 clnt->cl_vers = version->number; 179 clnt->cl_stats = program->stats; 180 clnt->cl_metrics = rpc_alloc_iostats(clnt); 181 err = -ENOMEM; 182 if (clnt->cl_metrics == NULL) 183 goto out_no_stats; 184 clnt->cl_program = program; 185 INIT_LIST_HEAD(&clnt->cl_tasks); 186 spin_lock_init(&clnt->cl_lock); 187 188 if (!xprt_bound(clnt->cl_xprt)) 189 clnt->cl_autobind = 1; 190 191 clnt->cl_timeout = xprt->timeout; 192 if (args->timeout != NULL) { 193 memcpy(&clnt->cl_timeout_default, args->timeout, 194 sizeof(clnt->cl_timeout_default)); 195 clnt->cl_timeout = &clnt->cl_timeout_default; 196 } 197 198 clnt->cl_rtt = &clnt->cl_rtt_default; 199 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); 200 201 kref_init(&clnt->cl_kref); 202 203 err = rpc_setup_pipedir(clnt, program->pipe_dir_name); 204 if (err < 0) 205 goto out_no_path; 206 207 auth = rpcauth_create(args->authflavor, clnt); 208 if (IS_ERR(auth)) { 209 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", 210 args->authflavor); 211 err = PTR_ERR(auth); 212 goto out_no_auth; 213 } 214 215 /* save the nodename */ 216 clnt->cl_nodelen = strlen(utsname()->nodename); 217 if (clnt->cl_nodelen > UNX_MAXNODENAME) 218 clnt->cl_nodelen = UNX_MAXNODENAME; 219 memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen); 220 rpc_register_client(clnt); 221 return clnt; 222 223 out_no_auth: 224 if (!IS_ERR(clnt->cl_dentry)) { 225 rpc_rmdir(clnt->cl_dentry); 226 rpc_put_mount(); 227 } 228 out_no_path: 229 rpc_free_iostats(clnt->cl_metrics); 230 out_no_stats: 231 if (clnt->cl_server != clnt->cl_inline_name) 232 kfree(clnt->cl_server); 233 kfree(clnt); 234 out_err: 235 xprt_put(xprt); 236 out_no_xprt: 237 rpciod_down(); 238 out_no_rpciod: 239 return ERR_PTR(err); 240 } 241 242 /* 243 * rpc_create - create an RPC client and transport with one call 244 * @args: rpc_clnt create argument structure 245 * 246 * Creates and initializes an RPC transport and an RPC client. 247 * 248 * It can ping the server in order to determine if it is up, and to see if 249 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables 250 * this behavior so asynchronous tasks can also use rpc_create. 251 */ 252 struct rpc_clnt *rpc_create(struct rpc_create_args *args) 253 { 254 struct rpc_xprt *xprt; 255 struct rpc_clnt *clnt; 256 struct xprt_create xprtargs = { 257 .ident = args->protocol, 258 .srcaddr = args->saddress, 259 .dstaddr = args->address, 260 .addrlen = args->addrsize, 261 }; 262 char servername[48]; 263 264 xprt = xprt_create_transport(&xprtargs); 265 if (IS_ERR(xprt)) 266 return (struct rpc_clnt *)xprt; 267 268 /* 269 * If the caller chooses not to specify a hostname, whip 270 * up a string representation of the passed-in address. 271 */ 272 if (args->servername == NULL) { 273 servername[0] = '\0'; 274 switch (args->address->sa_family) { 275 case AF_INET: { 276 struct sockaddr_in *sin = 277 (struct sockaddr_in *)args->address; 278 snprintf(servername, sizeof(servername), NIPQUAD_FMT, 279 NIPQUAD(sin->sin_addr.s_addr)); 280 break; 281 } 282 case AF_INET6: { 283 struct sockaddr_in6 *sin = 284 (struct sockaddr_in6 *)args->address; 285 snprintf(servername, sizeof(servername), NIP6_FMT, 286 NIP6(sin->sin6_addr)); 287 break; 288 } 289 default: 290 /* caller wants default server name, but 291 * address family isn't recognized. */ 292 return ERR_PTR(-EINVAL); 293 } 294 args->servername = servername; 295 } 296 297 xprt = xprt_create_transport(&xprtargs); 298 if (IS_ERR(xprt)) 299 return (struct rpc_clnt *)xprt; 300 301 /* 302 * By default, kernel RPC client connects from a reserved port. 303 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, 304 * but it is always enabled for rpciod, which handles the connect 305 * operation. 306 */ 307 xprt->resvport = 1; 308 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) 309 xprt->resvport = 0; 310 311 clnt = rpc_new_client(args, xprt); 312 if (IS_ERR(clnt)) 313 return clnt; 314 315 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { 316 int err = rpc_ping(clnt, RPC_TASK_SOFT); 317 if (err != 0) { 318 rpc_shutdown_client(clnt); 319 return ERR_PTR(err); 320 } 321 } 322 323 clnt->cl_softrtry = 1; 324 if (args->flags & RPC_CLNT_CREATE_HARDRTRY) 325 clnt->cl_softrtry = 0; 326 327 if (args->flags & RPC_CLNT_CREATE_AUTOBIND) 328 clnt->cl_autobind = 1; 329 if (args->flags & RPC_CLNT_CREATE_DISCRTRY) 330 clnt->cl_discrtry = 1; 331 332 return clnt; 333 } 334 EXPORT_SYMBOL_GPL(rpc_create); 335 336 /* 337 * This function clones the RPC client structure. It allows us to share the 338 * same transport while varying parameters such as the authentication 339 * flavour. 340 */ 341 struct rpc_clnt * 342 rpc_clone_client(struct rpc_clnt *clnt) 343 { 344 struct rpc_clnt *new; 345 int err = -ENOMEM; 346 347 new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); 348 if (!new) 349 goto out_no_clnt; 350 new->cl_parent = clnt; 351 /* Turn off autobind on clones */ 352 new->cl_autobind = 0; 353 INIT_LIST_HEAD(&new->cl_tasks); 354 spin_lock_init(&new->cl_lock); 355 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); 356 new->cl_metrics = rpc_alloc_iostats(clnt); 357 if (new->cl_metrics == NULL) 358 goto out_no_stats; 359 kref_init(&new->cl_kref); 360 err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); 361 if (err != 0) 362 goto out_no_path; 363 if (new->cl_auth) 364 atomic_inc(&new->cl_auth->au_count); 365 xprt_get(clnt->cl_xprt); 366 kref_get(&clnt->cl_kref); 367 rpc_register_client(new); 368 rpciod_up(); 369 return new; 370 out_no_path: 371 rpc_free_iostats(new->cl_metrics); 372 out_no_stats: 373 kfree(new); 374 out_no_clnt: 375 dprintk("RPC: %s: returned error %d\n", __FUNCTION__, err); 376 return ERR_PTR(err); 377 } 378 EXPORT_SYMBOL_GPL(rpc_clone_client); 379 380 /* 381 * Properly shut down an RPC client, terminating all outstanding 382 * requests. 383 */ 384 void rpc_shutdown_client(struct rpc_clnt *clnt) 385 { 386 dprintk("RPC: shutting down %s client for %s\n", 387 clnt->cl_protname, clnt->cl_server); 388 389 while (!list_empty(&clnt->cl_tasks)) { 390 rpc_killall_tasks(clnt); 391 wait_event_timeout(destroy_wait, 392 list_empty(&clnt->cl_tasks), 1*HZ); 393 } 394 395 rpc_release_client(clnt); 396 } 397 EXPORT_SYMBOL_GPL(rpc_shutdown_client); 398 399 /* 400 * Free an RPC client 401 */ 402 static void 403 rpc_free_client(struct kref *kref) 404 { 405 struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); 406 407 dprintk("RPC: destroying %s client for %s\n", 408 clnt->cl_protname, clnt->cl_server); 409 if (!IS_ERR(clnt->cl_dentry)) { 410 rpc_rmdir(clnt->cl_dentry); 411 rpc_put_mount(); 412 } 413 if (clnt->cl_parent != clnt) { 414 rpc_release_client(clnt->cl_parent); 415 goto out_free; 416 } 417 if (clnt->cl_server != clnt->cl_inline_name) 418 kfree(clnt->cl_server); 419 out_free: 420 rpc_unregister_client(clnt); 421 rpc_free_iostats(clnt->cl_metrics); 422 clnt->cl_metrics = NULL; 423 xprt_put(clnt->cl_xprt); 424 rpciod_down(); 425 kfree(clnt); 426 } 427 428 /* 429 * Free an RPC client 430 */ 431 static void 432 rpc_free_auth(struct kref *kref) 433 { 434 struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref); 435 436 if (clnt->cl_auth == NULL) { 437 rpc_free_client(kref); 438 return; 439 } 440 441 /* 442 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to 443 * release remaining GSS contexts. This mechanism ensures 444 * that it can do so safely. 445 */ 446 kref_init(kref); 447 rpcauth_release(clnt->cl_auth); 448 clnt->cl_auth = NULL; 449 kref_put(kref, rpc_free_client); 450 } 451 452 /* 453 * Release reference to the RPC client 454 */ 455 void 456 rpc_release_client(struct rpc_clnt *clnt) 457 { 458 dprintk("RPC: rpc_release_client(%p)\n", clnt); 459 460 if (list_empty(&clnt->cl_tasks)) 461 wake_up(&destroy_wait); 462 kref_put(&clnt->cl_kref, rpc_free_auth); 463 } 464 465 /** 466 * rpc_bind_new_program - bind a new RPC program to an existing client 467 * @old - old rpc_client 468 * @program - rpc program to set 469 * @vers - rpc program version 470 * 471 * Clones the rpc client and sets up a new RPC program. This is mainly 472 * of use for enabling different RPC programs to share the same transport. 473 * The Sun NFSv2/v3 ACL protocol can do this. 474 */ 475 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, 476 struct rpc_program *program, 477 u32 vers) 478 { 479 struct rpc_clnt *clnt; 480 struct rpc_version *version; 481 int err; 482 483 BUG_ON(vers >= program->nrvers || !program->version[vers]); 484 version = program->version[vers]; 485 clnt = rpc_clone_client(old); 486 if (IS_ERR(clnt)) 487 goto out; 488 clnt->cl_procinfo = version->procs; 489 clnt->cl_maxproc = version->nrprocs; 490 clnt->cl_protname = program->name; 491 clnt->cl_prog = program->number; 492 clnt->cl_vers = version->number; 493 clnt->cl_stats = program->stats; 494 err = rpc_ping(clnt, RPC_TASK_SOFT); 495 if (err != 0) { 496 rpc_shutdown_client(clnt); 497 clnt = ERR_PTR(err); 498 } 499 out: 500 return clnt; 501 } 502 EXPORT_SYMBOL_GPL(rpc_bind_new_program); 503 504 /* 505 * Default callback for async RPC calls 506 */ 507 static void 508 rpc_default_callback(struct rpc_task *task, void *data) 509 { 510 } 511 512 static const struct rpc_call_ops rpc_default_ops = { 513 .rpc_call_done = rpc_default_callback, 514 }; 515 516 /** 517 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it 518 * @task_setup_data: pointer to task initialisation data 519 */ 520 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) 521 { 522 struct rpc_task *task, *ret; 523 524 task = rpc_new_task(task_setup_data); 525 if (task == NULL) { 526 rpc_release_calldata(task_setup_data->callback_ops, 527 task_setup_data->callback_data); 528 ret = ERR_PTR(-ENOMEM); 529 goto out; 530 } 531 532 if (task->tk_status != 0) { 533 ret = ERR_PTR(task->tk_status); 534 rpc_put_task(task); 535 goto out; 536 } 537 atomic_inc(&task->tk_count); 538 rpc_execute(task); 539 ret = task; 540 out: 541 return ret; 542 } 543 EXPORT_SYMBOL_GPL(rpc_run_task); 544 545 /** 546 * rpc_call_sync - Perform a synchronous RPC call 547 * @clnt: pointer to RPC client 548 * @msg: RPC call parameters 549 * @flags: RPC call flags 550 */ 551 int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) 552 { 553 struct rpc_task *task; 554 struct rpc_task_setup task_setup_data = { 555 .rpc_client = clnt, 556 .rpc_message = msg, 557 .callback_ops = &rpc_default_ops, 558 .flags = flags, 559 }; 560 int status; 561 562 BUG_ON(flags & RPC_TASK_ASYNC); 563 564 task = rpc_run_task(&task_setup_data); 565 if (IS_ERR(task)) 566 return PTR_ERR(task); 567 status = task->tk_status; 568 rpc_put_task(task); 569 return status; 570 } 571 EXPORT_SYMBOL_GPL(rpc_call_sync); 572 573 /** 574 * rpc_call_async - Perform an asynchronous RPC call 575 * @clnt: pointer to RPC client 576 * @msg: RPC call parameters 577 * @flags: RPC call flags 578 * @ops: RPC call ops 579 * @data: user call data 580 */ 581 int 582 rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, 583 const struct rpc_call_ops *tk_ops, void *data) 584 { 585 struct rpc_task *task; 586 struct rpc_task_setup task_setup_data = { 587 .rpc_client = clnt, 588 .rpc_message = msg, 589 .callback_ops = tk_ops, 590 .callback_data = data, 591 .flags = flags|RPC_TASK_ASYNC, 592 }; 593 594 task = rpc_run_task(&task_setup_data); 595 if (IS_ERR(task)) 596 return PTR_ERR(task); 597 rpc_put_task(task); 598 return 0; 599 } 600 EXPORT_SYMBOL_GPL(rpc_call_async); 601 602 void 603 rpc_call_start(struct rpc_task *task) 604 { 605 task->tk_action = call_start; 606 } 607 EXPORT_SYMBOL_GPL(rpc_call_start); 608 609 /** 610 * rpc_peeraddr - extract remote peer address from clnt's xprt 611 * @clnt: RPC client structure 612 * @buf: target buffer 613 * @size: length of target buffer 614 * 615 * Returns the number of bytes that are actually in the stored address. 616 */ 617 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) 618 { 619 size_t bytes; 620 struct rpc_xprt *xprt = clnt->cl_xprt; 621 622 bytes = sizeof(xprt->addr); 623 if (bytes > bufsize) 624 bytes = bufsize; 625 memcpy(buf, &clnt->cl_xprt->addr, bytes); 626 return xprt->addrlen; 627 } 628 EXPORT_SYMBOL_GPL(rpc_peeraddr); 629 630 /** 631 * rpc_peeraddr2str - return remote peer address in printable format 632 * @clnt: RPC client structure 633 * @format: address format 634 * 635 */ 636 const char *rpc_peeraddr2str(struct rpc_clnt *clnt, 637 enum rpc_display_format_t format) 638 { 639 struct rpc_xprt *xprt = clnt->cl_xprt; 640 641 if (xprt->address_strings[format] != NULL) 642 return xprt->address_strings[format]; 643 else 644 return "unprintable"; 645 } 646 EXPORT_SYMBOL_GPL(rpc_peeraddr2str); 647 648 void 649 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) 650 { 651 struct rpc_xprt *xprt = clnt->cl_xprt; 652 if (xprt->ops->set_buffer_size) 653 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); 654 } 655 EXPORT_SYMBOL_GPL(rpc_setbufsize); 656 657 /* 658 * Return size of largest payload RPC client can support, in bytes 659 * 660 * For stream transports, this is one RPC record fragment (see RFC 661 * 1831), as we don't support multi-record requests yet. For datagram 662 * transports, this is the size of an IP packet minus the IP, UDP, and 663 * RPC header sizes. 664 */ 665 size_t rpc_max_payload(struct rpc_clnt *clnt) 666 { 667 return clnt->cl_xprt->max_payload; 668 } 669 EXPORT_SYMBOL_GPL(rpc_max_payload); 670 671 /** 672 * rpc_force_rebind - force transport to check that remote port is unchanged 673 * @clnt: client to rebind 674 * 675 */ 676 void rpc_force_rebind(struct rpc_clnt *clnt) 677 { 678 if (clnt->cl_autobind) 679 xprt_clear_bound(clnt->cl_xprt); 680 } 681 EXPORT_SYMBOL_GPL(rpc_force_rebind); 682 683 /* 684 * Restart an (async) RPC call. Usually called from within the 685 * exit handler. 686 */ 687 void 688 rpc_restart_call(struct rpc_task *task) 689 { 690 if (RPC_ASSASSINATED(task)) 691 return; 692 693 task->tk_action = call_start; 694 } 695 EXPORT_SYMBOL_GPL(rpc_restart_call); 696 697 /* 698 * 0. Initial state 699 * 700 * Other FSM states can be visited zero or more times, but 701 * this state is visited exactly once for each RPC. 702 */ 703 static void 704 call_start(struct rpc_task *task) 705 { 706 struct rpc_clnt *clnt = task->tk_client; 707 708 dprintk("RPC: %5u call_start %s%d proc %d (%s)\n", task->tk_pid, 709 clnt->cl_protname, clnt->cl_vers, 710 task->tk_msg.rpc_proc->p_proc, 711 (RPC_IS_ASYNC(task) ? "async" : "sync")); 712 713 /* Increment call count */ 714 task->tk_msg.rpc_proc->p_count++; 715 clnt->cl_stats->rpccnt++; 716 task->tk_action = call_reserve; 717 } 718 719 /* 720 * 1. Reserve an RPC call slot 721 */ 722 static void 723 call_reserve(struct rpc_task *task) 724 { 725 dprint_status(task); 726 727 if (!rpcauth_uptodatecred(task)) { 728 task->tk_action = call_refresh; 729 return; 730 } 731 732 task->tk_status = 0; 733 task->tk_action = call_reserveresult; 734 xprt_reserve(task); 735 } 736 737 /* 738 * 1b. Grok the result of xprt_reserve() 739 */ 740 static void 741 call_reserveresult(struct rpc_task *task) 742 { 743 int status = task->tk_status; 744 745 dprint_status(task); 746 747 /* 748 * After a call to xprt_reserve(), we must have either 749 * a request slot or else an error status. 750 */ 751 task->tk_status = 0; 752 if (status >= 0) { 753 if (task->tk_rqstp) { 754 task->tk_action = call_allocate; 755 return; 756 } 757 758 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", 759 __FUNCTION__, status); 760 rpc_exit(task, -EIO); 761 return; 762 } 763 764 /* 765 * Even though there was an error, we may have acquired 766 * a request slot somehow. Make sure not to leak it. 767 */ 768 if (task->tk_rqstp) { 769 printk(KERN_ERR "%s: status=%d, request allocated anyway\n", 770 __FUNCTION__, status); 771 xprt_release(task); 772 } 773 774 switch (status) { 775 case -EAGAIN: /* woken up; retry */ 776 task->tk_action = call_reserve; 777 return; 778 case -EIO: /* probably a shutdown */ 779 break; 780 default: 781 printk(KERN_ERR "%s: unrecognized error %d, exiting\n", 782 __FUNCTION__, status); 783 break; 784 } 785 rpc_exit(task, status); 786 } 787 788 /* 789 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. 790 * (Note: buffer memory is freed in xprt_release). 791 */ 792 static void 793 call_allocate(struct rpc_task *task) 794 { 795 unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack; 796 struct rpc_rqst *req = task->tk_rqstp; 797 struct rpc_xprt *xprt = task->tk_xprt; 798 struct rpc_procinfo *proc = task->tk_msg.rpc_proc; 799 800 dprint_status(task); 801 802 task->tk_status = 0; 803 task->tk_action = call_bind; 804 805 if (req->rq_buffer) 806 return; 807 808 if (proc->p_proc != 0) { 809 BUG_ON(proc->p_arglen == 0); 810 if (proc->p_decode != NULL) 811 BUG_ON(proc->p_replen == 0); 812 } 813 814 /* 815 * Calculate the size (in quads) of the RPC call 816 * and reply headers, and convert both values 817 * to byte sizes. 818 */ 819 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; 820 req->rq_callsize <<= 2; 821 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; 822 req->rq_rcvsize <<= 2; 823 824 req->rq_buffer = xprt->ops->buf_alloc(task, 825 req->rq_callsize + req->rq_rcvsize); 826 if (req->rq_buffer != NULL) 827 return; 828 829 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); 830 831 if (RPC_IS_ASYNC(task) || !signalled()) { 832 task->tk_action = call_allocate; 833 rpc_delay(task, HZ>>4); 834 return; 835 } 836 837 rpc_exit(task, -ERESTARTSYS); 838 } 839 840 static inline int 841 rpc_task_need_encode(struct rpc_task *task) 842 { 843 return task->tk_rqstp->rq_snd_buf.len == 0; 844 } 845 846 static inline void 847 rpc_task_force_reencode(struct rpc_task *task) 848 { 849 task->tk_rqstp->rq_snd_buf.len = 0; 850 } 851 852 static inline void 853 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) 854 { 855 buf->head[0].iov_base = start; 856 buf->head[0].iov_len = len; 857 buf->tail[0].iov_len = 0; 858 buf->page_len = 0; 859 buf->flags = 0; 860 buf->len = 0; 861 buf->buflen = len; 862 } 863 864 /* 865 * 3. Encode arguments of an RPC call 866 */ 867 static void 868 call_encode(struct rpc_task *task) 869 { 870 struct rpc_rqst *req = task->tk_rqstp; 871 kxdrproc_t encode; 872 __be32 *p; 873 874 dprint_status(task); 875 876 rpc_xdr_buf_init(&req->rq_snd_buf, 877 req->rq_buffer, 878 req->rq_callsize); 879 rpc_xdr_buf_init(&req->rq_rcv_buf, 880 (char *)req->rq_buffer + req->rq_callsize, 881 req->rq_rcvsize); 882 883 /* Encode header and provided arguments */ 884 encode = task->tk_msg.rpc_proc->p_encode; 885 if (!(p = call_header(task))) { 886 printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); 887 rpc_exit(task, -EIO); 888 return; 889 } 890 if (encode == NULL) 891 return; 892 893 task->tk_status = rpcauth_wrap_req(task, encode, req, p, 894 task->tk_msg.rpc_argp); 895 if (task->tk_status == -ENOMEM) { 896 /* XXX: Is this sane? */ 897 rpc_delay(task, 3*HZ); 898 task->tk_status = -EAGAIN; 899 } 900 } 901 902 /* 903 * 4. Get the server port number if not yet set 904 */ 905 static void 906 call_bind(struct rpc_task *task) 907 { 908 struct rpc_xprt *xprt = task->tk_xprt; 909 910 dprint_status(task); 911 912 task->tk_action = call_connect; 913 if (!xprt_bound(xprt)) { 914 task->tk_action = call_bind_status; 915 task->tk_timeout = xprt->bind_timeout; 916 xprt->ops->rpcbind(task); 917 } 918 } 919 920 /* 921 * 4a. Sort out bind result 922 */ 923 static void 924 call_bind_status(struct rpc_task *task) 925 { 926 int status = -EIO; 927 928 if (task->tk_status >= 0) { 929 dprint_status(task); 930 task->tk_status = 0; 931 task->tk_action = call_connect; 932 return; 933 } 934 935 switch (task->tk_status) { 936 case -EAGAIN: 937 dprintk("RPC: %5u rpcbind waiting for another request " 938 "to finish\n", task->tk_pid); 939 /* avoid busy-waiting here -- could be a network outage. */ 940 rpc_delay(task, 5*HZ); 941 goto retry_timeout; 942 case -EACCES: 943 dprintk("RPC: %5u remote rpcbind: RPC program/version " 944 "unavailable\n", task->tk_pid); 945 /* fail immediately if this is an RPC ping */ 946 if (task->tk_msg.rpc_proc->p_proc == 0) { 947 status = -EOPNOTSUPP; 948 break; 949 } 950 rpc_delay(task, 3*HZ); 951 goto retry_timeout; 952 case -ETIMEDOUT: 953 dprintk("RPC: %5u rpcbind request timed out\n", 954 task->tk_pid); 955 goto retry_timeout; 956 case -EPFNOSUPPORT: 957 /* server doesn't support any rpcbind version we know of */ 958 dprintk("RPC: %5u remote rpcbind service unavailable\n", 959 task->tk_pid); 960 break; 961 case -EPROTONOSUPPORT: 962 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", 963 task->tk_pid); 964 task->tk_status = 0; 965 task->tk_action = call_bind; 966 return; 967 default: 968 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", 969 task->tk_pid, -task->tk_status); 970 } 971 972 rpc_exit(task, status); 973 return; 974 975 retry_timeout: 976 task->tk_action = call_timeout; 977 } 978 979 /* 980 * 4b. Connect to the RPC server 981 */ 982 static void 983 call_connect(struct rpc_task *task) 984 { 985 struct rpc_xprt *xprt = task->tk_xprt; 986 987 dprintk("RPC: %5u call_connect xprt %p %s connected\n", 988 task->tk_pid, xprt, 989 (xprt_connected(xprt) ? "is" : "is not")); 990 991 task->tk_action = call_transmit; 992 if (!xprt_connected(xprt)) { 993 task->tk_action = call_connect_status; 994 if (task->tk_status < 0) 995 return; 996 xprt_connect(task); 997 } 998 } 999 1000 /* 1001 * 4c. Sort out connect result 1002 */ 1003 static void 1004 call_connect_status(struct rpc_task *task) 1005 { 1006 struct rpc_clnt *clnt = task->tk_client; 1007 int status = task->tk_status; 1008 1009 dprint_status(task); 1010 1011 task->tk_status = 0; 1012 if (status >= 0) { 1013 clnt->cl_stats->netreconn++; 1014 task->tk_action = call_transmit; 1015 return; 1016 } 1017 1018 /* Something failed: remote service port may have changed */ 1019 rpc_force_rebind(clnt); 1020 1021 switch (status) { 1022 case -ENOTCONN: 1023 case -EAGAIN: 1024 task->tk_action = call_bind; 1025 if (!RPC_IS_SOFT(task)) 1026 return; 1027 /* if soft mounted, test if we've timed out */ 1028 case -ETIMEDOUT: 1029 task->tk_action = call_timeout; 1030 return; 1031 } 1032 rpc_exit(task, -EIO); 1033 } 1034 1035 /* 1036 * 5. Transmit the RPC request, and wait for reply 1037 */ 1038 static void 1039 call_transmit(struct rpc_task *task) 1040 { 1041 dprint_status(task); 1042 1043 task->tk_action = call_status; 1044 if (task->tk_status < 0) 1045 return; 1046 task->tk_status = xprt_prepare_transmit(task); 1047 if (task->tk_status != 0) 1048 return; 1049 task->tk_action = call_transmit_status; 1050 /* Encode here so that rpcsec_gss can use correct sequence number. */ 1051 if (rpc_task_need_encode(task)) { 1052 BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); 1053 call_encode(task); 1054 /* Did the encode result in an error condition? */ 1055 if (task->tk_status != 0) 1056 return; 1057 } 1058 xprt_transmit(task); 1059 if (task->tk_status < 0) 1060 return; 1061 /* 1062 * On success, ensure that we call xprt_end_transmit() before sleeping 1063 * in order to allow access to the socket to other RPC requests. 1064 */ 1065 call_transmit_status(task); 1066 if (task->tk_msg.rpc_proc->p_decode != NULL) 1067 return; 1068 task->tk_action = rpc_exit_task; 1069 rpc_wake_up_task(task); 1070 } 1071 1072 /* 1073 * 5a. Handle cleanup after a transmission 1074 */ 1075 static void 1076 call_transmit_status(struct rpc_task *task) 1077 { 1078 task->tk_action = call_status; 1079 /* 1080 * Special case: if we've been waiting on the socket's write_space() 1081 * callback, then don't call xprt_end_transmit(). 1082 */ 1083 if (task->tk_status == -EAGAIN) 1084 return; 1085 xprt_end_transmit(task); 1086 rpc_task_force_reencode(task); 1087 } 1088 1089 /* 1090 * 6. Sort out the RPC call status 1091 */ 1092 static void 1093 call_status(struct rpc_task *task) 1094 { 1095 struct rpc_clnt *clnt = task->tk_client; 1096 struct rpc_rqst *req = task->tk_rqstp; 1097 int status; 1098 1099 if (req->rq_received > 0 && !req->rq_bytes_sent) 1100 task->tk_status = req->rq_received; 1101 1102 dprint_status(task); 1103 1104 status = task->tk_status; 1105 if (status >= 0) { 1106 task->tk_action = call_decode; 1107 return; 1108 } 1109 1110 task->tk_status = 0; 1111 switch(status) { 1112 case -EHOSTDOWN: 1113 case -EHOSTUNREACH: 1114 case -ENETUNREACH: 1115 /* 1116 * Delay any retries for 3 seconds, then handle as if it 1117 * were a timeout. 1118 */ 1119 rpc_delay(task, 3*HZ); 1120 case -ETIMEDOUT: 1121 task->tk_action = call_timeout; 1122 if (task->tk_client->cl_discrtry) 1123 xprt_force_disconnect(task->tk_xprt); 1124 break; 1125 case -ECONNREFUSED: 1126 case -ENOTCONN: 1127 rpc_force_rebind(clnt); 1128 task->tk_action = call_bind; 1129 break; 1130 case -EAGAIN: 1131 task->tk_action = call_transmit; 1132 break; 1133 case -EIO: 1134 /* shutdown or soft timeout */ 1135 rpc_exit(task, status); 1136 break; 1137 default: 1138 printk("%s: RPC call returned error %d\n", 1139 clnt->cl_protname, -status); 1140 rpc_exit(task, status); 1141 } 1142 } 1143 1144 /* 1145 * 6a. Handle RPC timeout 1146 * We do not release the request slot, so we keep using the 1147 * same XID for all retransmits. 1148 */ 1149 static void 1150 call_timeout(struct rpc_task *task) 1151 { 1152 struct rpc_clnt *clnt = task->tk_client; 1153 1154 if (xprt_adjust_timeout(task->tk_rqstp) == 0) { 1155 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); 1156 goto retry; 1157 } 1158 1159 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); 1160 task->tk_timeouts++; 1161 1162 if (RPC_IS_SOFT(task)) { 1163 printk(KERN_NOTICE "%s: server %s not responding, timed out\n", 1164 clnt->cl_protname, clnt->cl_server); 1165 rpc_exit(task, -EIO); 1166 return; 1167 } 1168 1169 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { 1170 task->tk_flags |= RPC_CALL_MAJORSEEN; 1171 printk(KERN_NOTICE "%s: server %s not responding, still trying\n", 1172 clnt->cl_protname, clnt->cl_server); 1173 } 1174 rpc_force_rebind(clnt); 1175 1176 retry: 1177 clnt->cl_stats->rpcretrans++; 1178 task->tk_action = call_bind; 1179 task->tk_status = 0; 1180 } 1181 1182 /* 1183 * 7. Decode the RPC reply 1184 */ 1185 static void 1186 call_decode(struct rpc_task *task) 1187 { 1188 struct rpc_clnt *clnt = task->tk_client; 1189 struct rpc_rqst *req = task->tk_rqstp; 1190 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; 1191 __be32 *p; 1192 1193 dprintk("RPC: %5u call_decode (status %d)\n", 1194 task->tk_pid, task->tk_status); 1195 1196 if (task->tk_flags & RPC_CALL_MAJORSEEN) { 1197 printk(KERN_NOTICE "%s: server %s OK\n", 1198 clnt->cl_protname, clnt->cl_server); 1199 task->tk_flags &= ~RPC_CALL_MAJORSEEN; 1200 } 1201 1202 if (task->tk_status < 12) { 1203 if (!RPC_IS_SOFT(task)) { 1204 task->tk_action = call_bind; 1205 clnt->cl_stats->rpcretrans++; 1206 goto out_retry; 1207 } 1208 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", 1209 clnt->cl_protname, task->tk_status); 1210 task->tk_action = call_timeout; 1211 goto out_retry; 1212 } 1213 1214 /* 1215 * Ensure that we see all writes made by xprt_complete_rqst() 1216 * before it changed req->rq_received. 1217 */ 1218 smp_rmb(); 1219 req->rq_rcv_buf.len = req->rq_private_buf.len; 1220 1221 /* Check that the softirq receive buffer is valid */ 1222 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, 1223 sizeof(req->rq_rcv_buf)) != 0); 1224 1225 /* Verify the RPC header */ 1226 p = call_verify(task); 1227 if (IS_ERR(p)) { 1228 if (p == ERR_PTR(-EAGAIN)) 1229 goto out_retry; 1230 return; 1231 } 1232 1233 task->tk_action = rpc_exit_task; 1234 1235 if (decode) { 1236 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, 1237 task->tk_msg.rpc_resp); 1238 } 1239 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, 1240 task->tk_status); 1241 return; 1242 out_retry: 1243 req->rq_received = req->rq_private_buf.len = 0; 1244 task->tk_status = 0; 1245 if (task->tk_client->cl_discrtry) 1246 xprt_force_disconnect(task->tk_xprt); 1247 } 1248 1249 /* 1250 * 8. Refresh the credentials if rejected by the server 1251 */ 1252 static void 1253 call_refresh(struct rpc_task *task) 1254 { 1255 dprint_status(task); 1256 1257 task->tk_action = call_refreshresult; 1258 task->tk_status = 0; 1259 task->tk_client->cl_stats->rpcauthrefresh++; 1260 rpcauth_refreshcred(task); 1261 } 1262 1263 /* 1264 * 8a. Process the results of a credential refresh 1265 */ 1266 static void 1267 call_refreshresult(struct rpc_task *task) 1268 { 1269 int status = task->tk_status; 1270 1271 dprint_status(task); 1272 1273 task->tk_status = 0; 1274 task->tk_action = call_reserve; 1275 if (status >= 0 && rpcauth_uptodatecred(task)) 1276 return; 1277 if (status == -EACCES) { 1278 rpc_exit(task, -EACCES); 1279 return; 1280 } 1281 task->tk_action = call_refresh; 1282 if (status != -ETIMEDOUT) 1283 rpc_delay(task, 3*HZ); 1284 return; 1285 } 1286 1287 /* 1288 * Call header serialization 1289 */ 1290 static __be32 * 1291 call_header(struct rpc_task *task) 1292 { 1293 struct rpc_clnt *clnt = task->tk_client; 1294 struct rpc_rqst *req = task->tk_rqstp; 1295 __be32 *p = req->rq_svec[0].iov_base; 1296 1297 /* FIXME: check buffer size? */ 1298 1299 p = xprt_skip_transport_header(task->tk_xprt, p); 1300 *p++ = req->rq_xid; /* XID */ 1301 *p++ = htonl(RPC_CALL); /* CALL */ 1302 *p++ = htonl(RPC_VERSION); /* RPC version */ 1303 *p++ = htonl(clnt->cl_prog); /* program number */ 1304 *p++ = htonl(clnt->cl_vers); /* program version */ 1305 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ 1306 p = rpcauth_marshcred(task, p); 1307 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); 1308 return p; 1309 } 1310 1311 /* 1312 * Reply header verification 1313 */ 1314 static __be32 * 1315 call_verify(struct rpc_task *task) 1316 { 1317 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; 1318 int len = task->tk_rqstp->rq_rcv_buf.len >> 2; 1319 __be32 *p = iov->iov_base; 1320 u32 n; 1321 int error = -EACCES; 1322 1323 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { 1324 /* RFC-1014 says that the representation of XDR data must be a 1325 * multiple of four bytes 1326 * - if it isn't pointer subtraction in the NFS client may give 1327 * undefined results 1328 */ 1329 dprintk("RPC: %5u %s: XDR representation not a multiple of" 1330 " 4 bytes: 0x%x\n", task->tk_pid, __FUNCTION__, 1331 task->tk_rqstp->rq_rcv_buf.len); 1332 goto out_eio; 1333 } 1334 if ((len -= 3) < 0) 1335 goto out_overflow; 1336 p += 1; /* skip XID */ 1337 1338 if ((n = ntohl(*p++)) != RPC_REPLY) { 1339 dprintk("RPC: %5u %s: not an RPC reply: %x\n", 1340 task->tk_pid, __FUNCTION__, n); 1341 goto out_garbage; 1342 } 1343 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { 1344 if (--len < 0) 1345 goto out_overflow; 1346 switch ((n = ntohl(*p++))) { 1347 case RPC_AUTH_ERROR: 1348 break; 1349 case RPC_MISMATCH: 1350 dprintk("RPC: %5u %s: RPC call version " 1351 "mismatch!\n", 1352 task->tk_pid, __FUNCTION__); 1353 error = -EPROTONOSUPPORT; 1354 goto out_err; 1355 default: 1356 dprintk("RPC: %5u %s: RPC call rejected, " 1357 "unknown error: %x\n", 1358 task->tk_pid, __FUNCTION__, n); 1359 goto out_eio; 1360 } 1361 if (--len < 0) 1362 goto out_overflow; 1363 switch ((n = ntohl(*p++))) { 1364 case RPC_AUTH_REJECTEDCRED: 1365 case RPC_AUTH_REJECTEDVERF: 1366 case RPCSEC_GSS_CREDPROBLEM: 1367 case RPCSEC_GSS_CTXPROBLEM: 1368 if (!task->tk_cred_retry) 1369 break; 1370 task->tk_cred_retry--; 1371 dprintk("RPC: %5u %s: retry stale creds\n", 1372 task->tk_pid, __FUNCTION__); 1373 rpcauth_invalcred(task); 1374 /* Ensure we obtain a new XID! */ 1375 xprt_release(task); 1376 task->tk_action = call_refresh; 1377 goto out_retry; 1378 case RPC_AUTH_BADCRED: 1379 case RPC_AUTH_BADVERF: 1380 /* possibly garbled cred/verf? */ 1381 if (!task->tk_garb_retry) 1382 break; 1383 task->tk_garb_retry--; 1384 dprintk("RPC: %5u %s: retry garbled creds\n", 1385 task->tk_pid, __FUNCTION__); 1386 task->tk_action = call_bind; 1387 goto out_retry; 1388 case RPC_AUTH_TOOWEAK: 1389 printk(KERN_NOTICE "call_verify: server %s requires stronger " 1390 "authentication.\n", task->tk_client->cl_server); 1391 break; 1392 default: 1393 dprintk("RPC: %5u %s: unknown auth error: %x\n", 1394 task->tk_pid, __FUNCTION__, n); 1395 error = -EIO; 1396 } 1397 dprintk("RPC: %5u %s: call rejected %d\n", 1398 task->tk_pid, __FUNCTION__, n); 1399 goto out_err; 1400 } 1401 if (!(p = rpcauth_checkverf(task, p))) { 1402 dprintk("RPC: %5u %s: auth check failed\n", 1403 task->tk_pid, __FUNCTION__); 1404 goto out_garbage; /* bad verifier, retry */ 1405 } 1406 len = p - (__be32 *)iov->iov_base - 1; 1407 if (len < 0) 1408 goto out_overflow; 1409 switch ((n = ntohl(*p++))) { 1410 case RPC_SUCCESS: 1411 return p; 1412 case RPC_PROG_UNAVAIL: 1413 dprintk("RPC: %5u %s: program %u is unsupported by server %s\n", 1414 task->tk_pid, __FUNCTION__, 1415 (unsigned int)task->tk_client->cl_prog, 1416 task->tk_client->cl_server); 1417 error = -EPFNOSUPPORT; 1418 goto out_err; 1419 case RPC_PROG_MISMATCH: 1420 dprintk("RPC: %5u %s: program %u, version %u unsupported by " 1421 "server %s\n", task->tk_pid, __FUNCTION__, 1422 (unsigned int)task->tk_client->cl_prog, 1423 (unsigned int)task->tk_client->cl_vers, 1424 task->tk_client->cl_server); 1425 error = -EPROTONOSUPPORT; 1426 goto out_err; 1427 case RPC_PROC_UNAVAIL: 1428 dprintk("RPC: %5u %s: proc %p unsupported by program %u, " 1429 "version %u on server %s\n", 1430 task->tk_pid, __FUNCTION__, 1431 task->tk_msg.rpc_proc, 1432 task->tk_client->cl_prog, 1433 task->tk_client->cl_vers, 1434 task->tk_client->cl_server); 1435 error = -EOPNOTSUPP; 1436 goto out_err; 1437 case RPC_GARBAGE_ARGS: 1438 dprintk("RPC: %5u %s: server saw garbage\n", 1439 task->tk_pid, __FUNCTION__); 1440 break; /* retry */ 1441 default: 1442 dprintk("RPC: %5u %s: server accept status: %x\n", 1443 task->tk_pid, __FUNCTION__, n); 1444 /* Also retry */ 1445 } 1446 1447 out_garbage: 1448 task->tk_client->cl_stats->rpcgarbage++; 1449 if (task->tk_garb_retry) { 1450 task->tk_garb_retry--; 1451 dprintk("RPC: %5u %s: retrying\n", 1452 task->tk_pid, __FUNCTION__); 1453 task->tk_action = call_bind; 1454 out_retry: 1455 return ERR_PTR(-EAGAIN); 1456 } 1457 out_eio: 1458 error = -EIO; 1459 out_err: 1460 rpc_exit(task, error); 1461 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, 1462 __FUNCTION__, error); 1463 return ERR_PTR(error); 1464 out_overflow: 1465 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, 1466 __FUNCTION__); 1467 goto out_garbage; 1468 } 1469 1470 static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj) 1471 { 1472 return 0; 1473 } 1474 1475 static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj) 1476 { 1477 return 0; 1478 } 1479 1480 static struct rpc_procinfo rpcproc_null = { 1481 .p_encode = rpcproc_encode_null, 1482 .p_decode = rpcproc_decode_null, 1483 }; 1484 1485 static int rpc_ping(struct rpc_clnt *clnt, int flags) 1486 { 1487 struct rpc_message msg = { 1488 .rpc_proc = &rpcproc_null, 1489 }; 1490 int err; 1491 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); 1492 err = rpc_call_sync(clnt, &msg, flags); 1493 put_rpccred(msg.rpc_cred); 1494 return err; 1495 } 1496 1497 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) 1498 { 1499 struct rpc_message msg = { 1500 .rpc_proc = &rpcproc_null, 1501 .rpc_cred = cred, 1502 }; 1503 struct rpc_task_setup task_setup_data = { 1504 .rpc_client = clnt, 1505 .rpc_message = &msg, 1506 .callback_ops = &rpc_default_ops, 1507 .flags = flags, 1508 }; 1509 return rpc_run_task(&task_setup_data); 1510 } 1511 EXPORT_SYMBOL_GPL(rpc_call_null); 1512 1513 #ifdef RPC_DEBUG 1514 void rpc_show_tasks(void) 1515 { 1516 struct rpc_clnt *clnt; 1517 struct rpc_task *t; 1518 1519 spin_lock(&rpc_client_lock); 1520 if (list_empty(&all_clients)) 1521 goto out; 1522 printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout " 1523 "-rpcwait -action- ---ops--\n"); 1524 list_for_each_entry(clnt, &all_clients, cl_clients) { 1525 if (list_empty(&clnt->cl_tasks)) 1526 continue; 1527 spin_lock(&clnt->cl_lock); 1528 list_for_each_entry(t, &clnt->cl_tasks, tk_task) { 1529 const char *rpc_waitq = "none"; 1530 int proc; 1531 1532 if (t->tk_msg.rpc_proc) 1533 proc = t->tk_msg.rpc_proc->p_proc; 1534 else 1535 proc = -1; 1536 1537 if (RPC_IS_QUEUED(t)) 1538 rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq); 1539 1540 printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n", 1541 t->tk_pid, proc, 1542 t->tk_flags, t->tk_status, 1543 t->tk_client, 1544 (t->tk_client ? t->tk_client->cl_prog : 0), 1545 t->tk_rqstp, t->tk_timeout, 1546 rpc_waitq, 1547 t->tk_action, t->tk_ops); 1548 } 1549 spin_unlock(&clnt->cl_lock); 1550 } 1551 out: 1552 spin_unlock(&rpc_client_lock); 1553 } 1554 #endif 1555