1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/net/sunrpc/clnt.c 4 * 5 * This file contains the high-level RPC interface. 6 * It is modeled as a finite state machine to support both synchronous 7 * and asynchronous requests. 8 * 9 * - RPC header generation and argument serialization. 10 * - Credential refresh. 11 * - TCP connect handling. 12 * - Retry of operation when it is suspected the operation failed because 13 * of uid squashing on the server, or when the credentials were stale 14 * and need to be refreshed, or when a packet was damaged in transit. 15 * This may be have to be moved to the VFS layer. 16 * 17 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> 18 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> 19 */ 20 21 22 #include <linux/module.h> 23 #include <linux/types.h> 24 #include <linux/kallsyms.h> 25 #include <linux/mm.h> 26 #include <linux/namei.h> 27 #include <linux/mount.h> 28 #include <linux/slab.h> 29 #include <linux/rcupdate.h> 30 #include <linux/utsname.h> 31 #include <linux/workqueue.h> 32 #include <linux/in.h> 33 #include <linux/in6.h> 34 #include <linux/un.h> 35 36 #include <linux/sunrpc/clnt.h> 37 #include <linux/sunrpc/addr.h> 38 #include <linux/sunrpc/rpc_pipe_fs.h> 39 #include <linux/sunrpc/metrics.h> 40 #include <linux/sunrpc/bc_xprt.h> 41 #include <trace/events/sunrpc.h> 42 43 #include "sunrpc.h" 44 #include "sysfs.h" 45 #include "netns.h" 46 47 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 48 # define RPCDBG_FACILITY RPCDBG_CALL 49 #endif 50 51 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); 52 53 static void call_start(struct rpc_task *task); 54 static void call_reserve(struct rpc_task *task); 55 static void call_reserveresult(struct rpc_task *task); 56 static void call_allocate(struct rpc_task *task); 57 static void call_encode(struct rpc_task *task); 58 static void call_decode(struct rpc_task *task); 59 static void call_bind(struct rpc_task *task); 60 static void call_bind_status(struct rpc_task *task); 61 static void call_transmit(struct rpc_task *task); 62 static void call_status(struct rpc_task *task); 63 static void call_transmit_status(struct rpc_task *task); 64 static void call_refresh(struct rpc_task *task); 65 static void call_refreshresult(struct rpc_task *task); 66 static void call_connect(struct rpc_task *task); 67 static void call_connect_status(struct rpc_task *task); 68 69 static int rpc_encode_header(struct rpc_task *task, 70 struct xdr_stream *xdr); 71 static int rpc_decode_header(struct rpc_task *task, 72 struct xdr_stream *xdr); 73 static int rpc_ping(struct rpc_clnt *clnt); 74 static int rpc_ping_noreply(struct rpc_clnt *clnt); 75 static void rpc_check_timeout(struct rpc_task *task); 76 77 static void rpc_register_client(struct rpc_clnt *clnt) 78 { 79 struct net *net = rpc_net_ns(clnt); 80 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 81 82 spin_lock(&sn->rpc_client_lock); 83 list_add(&clnt->cl_clients, &sn->all_clients); 84 spin_unlock(&sn->rpc_client_lock); 85 } 86 87 static void rpc_unregister_client(struct rpc_clnt *clnt) 88 { 89 struct net *net = rpc_net_ns(clnt); 90 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 91 92 spin_lock(&sn->rpc_client_lock); 93 list_del(&clnt->cl_clients); 94 spin_unlock(&sn->rpc_client_lock); 95 } 96 97 static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) 98 { 99 rpc_remove_client_dir(clnt); 100 } 101 102 static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) 103 { 104 struct net *net = rpc_net_ns(clnt); 105 struct super_block *pipefs_sb; 106 107 pipefs_sb = rpc_get_sb_net(net); 108 if (pipefs_sb) { 109 if (pipefs_sb == clnt->pipefs_sb) 110 __rpc_clnt_remove_pipedir(clnt); 111 rpc_put_sb_net(net); 112 } 113 } 114 115 static int rpc_setup_pipedir_sb(struct super_block *sb, 116 struct rpc_clnt *clnt) 117 { 118 static uint32_t clntid; 119 const char *dir_name = clnt->cl_program->pipe_dir_name; 120 char name[15]; 121 struct dentry *dir; 122 int err; 123 124 dir = rpc_d_lookup_sb(sb, dir_name); 125 if (dir == NULL) { 126 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); 127 return -ENOENT; 128 } 129 for (;;) { 130 snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); 131 name[sizeof(name) - 1] = '\0'; 132 err = rpc_create_client_dir(dir, name, clnt); 133 if (!err) 134 break; 135 if (err == -EEXIST) 136 continue; 137 printk(KERN_INFO "RPC: Couldn't create pipefs entry" 138 " %s/%s, error %d\n", 139 dir_name, name, err); 140 break; 141 } 142 dput(dir); 143 return err; 144 } 145 146 static int 147 rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt) 148 { 149 clnt->pipefs_sb = pipefs_sb; 150 151 if (clnt->cl_program->pipe_dir_name != NULL) { 152 int err = rpc_setup_pipedir_sb(pipefs_sb, clnt); 153 if (err && err != -ENOENT) 154 return err; 155 } 156 return 0; 157 } 158 159 static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) 160 { 161 if (clnt->cl_program->pipe_dir_name == NULL) 162 return 1; 163 164 switch (event) { 165 case RPC_PIPEFS_MOUNT: 166 if (clnt->cl_pipedir_objects.pdh_dentry != NULL) 167 return 1; 168 if (refcount_read(&clnt->cl_count) == 0) 169 return 1; 170 break; 171 case RPC_PIPEFS_UMOUNT: 172 if (clnt->cl_pipedir_objects.pdh_dentry == NULL) 173 return 1; 174 break; 175 } 176 return 0; 177 } 178 179 static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, 180 struct super_block *sb) 181 { 182 switch (event) { 183 case RPC_PIPEFS_MOUNT: 184 return rpc_setup_pipedir_sb(sb, clnt); 185 case RPC_PIPEFS_UMOUNT: 186 __rpc_clnt_remove_pipedir(clnt); 187 break; 188 default: 189 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); 190 return -ENOTSUPP; 191 } 192 return 0; 193 } 194 195 static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, 196 struct super_block *sb) 197 { 198 int error = 0; 199 200 for (;; clnt = clnt->cl_parent) { 201 if (!rpc_clnt_skip_event(clnt, event)) 202 error = __rpc_clnt_handle_event(clnt, event, sb); 203 if (error || clnt == clnt->cl_parent) 204 break; 205 } 206 return error; 207 } 208 209 static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) 210 { 211 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 212 struct rpc_clnt *clnt; 213 214 spin_lock(&sn->rpc_client_lock); 215 list_for_each_entry(clnt, &sn->all_clients, cl_clients) { 216 if (rpc_clnt_skip_event(clnt, event)) 217 continue; 218 spin_unlock(&sn->rpc_client_lock); 219 return clnt; 220 } 221 spin_unlock(&sn->rpc_client_lock); 222 return NULL; 223 } 224 225 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, 226 void *ptr) 227 { 228 struct super_block *sb = ptr; 229 struct rpc_clnt *clnt; 230 int error = 0; 231 232 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { 233 error = __rpc_pipefs_event(clnt, event, sb); 234 if (error) 235 break; 236 } 237 return error; 238 } 239 240 static struct notifier_block rpc_clients_block = { 241 .notifier_call = rpc_pipefs_event, 242 .priority = SUNRPC_PIPEFS_RPC_PRIO, 243 }; 244 245 int rpc_clients_notifier_register(void) 246 { 247 return rpc_pipefs_notifier_register(&rpc_clients_block); 248 } 249 250 void rpc_clients_notifier_unregister(void) 251 { 252 return rpc_pipefs_notifier_unregister(&rpc_clients_block); 253 } 254 255 static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt, 256 struct rpc_xprt *xprt, 257 const struct rpc_timeout *timeout) 258 { 259 struct rpc_xprt *old; 260 261 spin_lock(&clnt->cl_lock); 262 old = rcu_dereference_protected(clnt->cl_xprt, 263 lockdep_is_held(&clnt->cl_lock)); 264 265 clnt->cl_timeout = timeout; 266 rcu_assign_pointer(clnt->cl_xprt, xprt); 267 spin_unlock(&clnt->cl_lock); 268 269 return old; 270 } 271 272 static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) 273 { 274 ssize_t copied; 275 276 copied = strscpy(clnt->cl_nodename, 277 nodename, sizeof(clnt->cl_nodename)); 278 279 clnt->cl_nodelen = copied < 0 280 ? sizeof(clnt->cl_nodename) - 1 281 : copied; 282 } 283 284 static int rpc_client_register(struct rpc_clnt *clnt, 285 rpc_authflavor_t pseudoflavor, 286 const char *client_name) 287 { 288 struct rpc_auth_create_args auth_args = { 289 .pseudoflavor = pseudoflavor, 290 .target_name = client_name, 291 }; 292 struct rpc_auth *auth; 293 struct net *net = rpc_net_ns(clnt); 294 struct super_block *pipefs_sb; 295 int err; 296 297 rpc_clnt_debugfs_register(clnt); 298 299 pipefs_sb = rpc_get_sb_net(net); 300 if (pipefs_sb) { 301 err = rpc_setup_pipedir(pipefs_sb, clnt); 302 if (err) 303 goto out; 304 } 305 306 rpc_register_client(clnt); 307 if (pipefs_sb) 308 rpc_put_sb_net(net); 309 310 auth = rpcauth_create(&auth_args, clnt); 311 if (IS_ERR(auth)) { 312 dprintk("RPC: Couldn't create auth handle (flavor %u)\n", 313 pseudoflavor); 314 err = PTR_ERR(auth); 315 goto err_auth; 316 } 317 return 0; 318 err_auth: 319 pipefs_sb = rpc_get_sb_net(net); 320 rpc_unregister_client(clnt); 321 __rpc_clnt_remove_pipedir(clnt); 322 out: 323 if (pipefs_sb) 324 rpc_put_sb_net(net); 325 rpc_sysfs_client_destroy(clnt); 326 rpc_clnt_debugfs_unregister(clnt); 327 return err; 328 } 329 330 static DEFINE_IDA(rpc_clids); 331 332 void rpc_cleanup_clids(void) 333 { 334 ida_destroy(&rpc_clids); 335 } 336 337 static int rpc_alloc_clid(struct rpc_clnt *clnt) 338 { 339 int clid; 340 341 clid = ida_alloc(&rpc_clids, GFP_KERNEL); 342 if (clid < 0) 343 return clid; 344 clnt->cl_clid = clid; 345 return 0; 346 } 347 348 static void rpc_free_clid(struct rpc_clnt *clnt) 349 { 350 ida_free(&rpc_clids, clnt->cl_clid); 351 } 352 353 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, 354 struct rpc_xprt_switch *xps, 355 struct rpc_xprt *xprt, 356 struct rpc_clnt *parent) 357 { 358 const struct rpc_program *program = args->program; 359 const struct rpc_version *version; 360 struct rpc_clnt *clnt = NULL; 361 const struct rpc_timeout *timeout; 362 const char *nodename = args->nodename; 363 int err; 364 365 err = rpciod_up(); 366 if (err) 367 goto out_no_rpciod; 368 369 err = -EINVAL; 370 if (args->version >= program->nrvers) 371 goto out_err; 372 version = program->version[args->version]; 373 if (version == NULL) 374 goto out_err; 375 376 err = -ENOMEM; 377 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); 378 if (!clnt) 379 goto out_err; 380 clnt->cl_parent = parent ? : clnt; 381 clnt->cl_xprtsec = args->xprtsec; 382 383 err = rpc_alloc_clid(clnt); 384 if (err) 385 goto out_no_clid; 386 387 clnt->cl_cred = get_cred(args->cred); 388 clnt->cl_procinfo = version->procs; 389 clnt->cl_maxproc = version->nrprocs; 390 clnt->cl_prog = args->prognumber ? : program->number; 391 clnt->cl_vers = version->number; 392 clnt->cl_stats = args->stats ? : program->stats; 393 clnt->cl_metrics = rpc_alloc_iostats(clnt); 394 rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); 395 err = -ENOMEM; 396 if (clnt->cl_metrics == NULL) 397 goto out_no_stats; 398 clnt->cl_program = program; 399 INIT_LIST_HEAD(&clnt->cl_tasks); 400 spin_lock_init(&clnt->cl_lock); 401 402 timeout = xprt->timeout; 403 if (args->timeout != NULL) { 404 memcpy(&clnt->cl_timeout_default, args->timeout, 405 sizeof(clnt->cl_timeout_default)); 406 timeout = &clnt->cl_timeout_default; 407 } 408 409 rpc_clnt_set_transport(clnt, xprt, timeout); 410 xprt->main = true; 411 xprt_iter_init(&clnt->cl_xpi, xps); 412 xprt_switch_put(xps); 413 414 clnt->cl_rtt = &clnt->cl_rtt_default; 415 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); 416 417 refcount_set(&clnt->cl_count, 1); 418 419 if (nodename == NULL) 420 nodename = utsname()->nodename; 421 /* save the nodename */ 422 rpc_clnt_set_nodename(clnt, nodename); 423 424 rpc_sysfs_client_setup(clnt, xps, rpc_net_ns(clnt)); 425 err = rpc_client_register(clnt, args->authflavor, args->client_name); 426 if (err) 427 goto out_no_path; 428 if (parent) 429 refcount_inc(&parent->cl_count); 430 431 trace_rpc_clnt_new(clnt, xprt, args); 432 return clnt; 433 434 out_no_path: 435 rpc_free_iostats(clnt->cl_metrics); 436 out_no_stats: 437 put_cred(clnt->cl_cred); 438 rpc_free_clid(clnt); 439 out_no_clid: 440 kfree(clnt); 441 out_err: 442 rpciod_down(); 443 out_no_rpciod: 444 xprt_switch_put(xps); 445 xprt_put(xprt); 446 trace_rpc_clnt_new_err(program->name, args->servername, err); 447 return ERR_PTR(err); 448 } 449 450 static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args, 451 struct rpc_xprt *xprt) 452 { 453 struct rpc_clnt *clnt = NULL; 454 struct rpc_xprt_switch *xps; 455 456 if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) { 457 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC)); 458 xps = args->bc_xprt->xpt_bc_xps; 459 xprt_switch_get(xps); 460 } else { 461 xps = xprt_switch_alloc(xprt, GFP_KERNEL); 462 if (xps == NULL) { 463 xprt_put(xprt); 464 return ERR_PTR(-ENOMEM); 465 } 466 if (xprt->bc_xprt) { 467 xprt_switch_get(xps); 468 xprt->bc_xprt->xpt_bc_xps = xps; 469 } 470 } 471 clnt = rpc_new_client(args, xps, xprt, NULL); 472 if (IS_ERR(clnt)) 473 return clnt; 474 475 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { 476 int err = rpc_ping(clnt); 477 if (err != 0) { 478 rpc_shutdown_client(clnt); 479 return ERR_PTR(err); 480 } 481 } else if (args->flags & RPC_CLNT_CREATE_CONNECTED) { 482 int err = rpc_ping_noreply(clnt); 483 if (err != 0) { 484 rpc_shutdown_client(clnt); 485 return ERR_PTR(err); 486 } 487 } 488 489 clnt->cl_softrtry = 1; 490 if (args->flags & (RPC_CLNT_CREATE_HARDRTRY|RPC_CLNT_CREATE_SOFTERR)) { 491 clnt->cl_softrtry = 0; 492 if (args->flags & RPC_CLNT_CREATE_SOFTERR) 493 clnt->cl_softerr = 1; 494 } 495 496 if (args->flags & RPC_CLNT_CREATE_AUTOBIND) 497 clnt->cl_autobind = 1; 498 if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT) 499 clnt->cl_noretranstimeo = 1; 500 if (args->flags & RPC_CLNT_CREATE_DISCRTRY) 501 clnt->cl_discrtry = 1; 502 if (!(args->flags & RPC_CLNT_CREATE_QUIET)) 503 clnt->cl_chatty = 1; 504 if (args->flags & RPC_CLNT_CREATE_NETUNREACH_FATAL) 505 clnt->cl_netunreach_fatal = 1; 506 507 return clnt; 508 } 509 510 /** 511 * rpc_create - create an RPC client and transport with one call 512 * @args: rpc_clnt create argument structure 513 * 514 * Creates and initializes an RPC transport and an RPC client. 515 * 516 * It can ping the server in order to determine if it is up, and to see if 517 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables 518 * this behavior so asynchronous tasks can also use rpc_create. 519 */ 520 struct rpc_clnt *rpc_create(struct rpc_create_args *args) 521 { 522 struct rpc_xprt *xprt; 523 struct xprt_create xprtargs = { 524 .net = args->net, 525 .ident = args->protocol, 526 .srcaddr = args->saddress, 527 .dstaddr = args->address, 528 .addrlen = args->addrsize, 529 .servername = args->servername, 530 .bc_xprt = args->bc_xprt, 531 .xprtsec = args->xprtsec, 532 .connect_timeout = args->connect_timeout, 533 .reconnect_timeout = args->reconnect_timeout, 534 }; 535 char servername[RPC_MAXNETNAMELEN]; 536 struct rpc_clnt *clnt; 537 int i; 538 539 if (args->bc_xprt) { 540 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC)); 541 xprt = args->bc_xprt->xpt_bc_xprt; 542 if (xprt) { 543 xprt_get(xprt); 544 return rpc_create_xprt(args, xprt); 545 } 546 } 547 548 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) 549 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; 550 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) 551 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; 552 /* 553 * If the caller chooses not to specify a hostname, whip 554 * up a string representation of the passed-in address. 555 */ 556 if (xprtargs.servername == NULL) { 557 struct sockaddr_un *sun = 558 (struct sockaddr_un *)args->address; 559 struct sockaddr_in *sin = 560 (struct sockaddr_in *)args->address; 561 struct sockaddr_in6 *sin6 = 562 (struct sockaddr_in6 *)args->address; 563 564 servername[0] = '\0'; 565 switch (args->address->sa_family) { 566 case AF_LOCAL: 567 if (sun->sun_path[0]) 568 snprintf(servername, sizeof(servername), "%s", 569 sun->sun_path); 570 else 571 snprintf(servername, sizeof(servername), "@%s", 572 sun->sun_path+1); 573 break; 574 case AF_INET: 575 snprintf(servername, sizeof(servername), "%pI4", 576 &sin->sin_addr.s_addr); 577 break; 578 case AF_INET6: 579 snprintf(servername, sizeof(servername), "%pI6", 580 &sin6->sin6_addr); 581 break; 582 default: 583 /* caller wants default server name, but 584 * address family isn't recognized. */ 585 return ERR_PTR(-EINVAL); 586 } 587 xprtargs.servername = servername; 588 } 589 590 xprt = xprt_create_transport(&xprtargs); 591 if (IS_ERR(xprt)) 592 return (struct rpc_clnt *)xprt; 593 594 /* 595 * By default, kernel RPC client connects from a reserved port. 596 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, 597 * but it is always enabled for rpciod, which handles the connect 598 * operation. 599 */ 600 xprt->resvport = 1; 601 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) 602 xprt->resvport = 0; 603 xprt->reuseport = 0; 604 if (args->flags & RPC_CLNT_CREATE_REUSEPORT) 605 xprt->reuseport = 1; 606 607 clnt = rpc_create_xprt(args, xprt); 608 if (IS_ERR(clnt) || args->nconnect <= 1) 609 return clnt; 610 611 for (i = 0; i < args->nconnect - 1; i++) { 612 if (rpc_clnt_add_xprt(clnt, &xprtargs, NULL, NULL) < 0) 613 break; 614 } 615 return clnt; 616 } 617 EXPORT_SYMBOL_GPL(rpc_create); 618 619 /* 620 * This function clones the RPC client structure. It allows us to share the 621 * same transport while varying parameters such as the authentication 622 * flavour. 623 */ 624 static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, 625 struct rpc_clnt *clnt) 626 { 627 struct rpc_xprt_switch *xps; 628 struct rpc_xprt *xprt; 629 struct rpc_clnt *new; 630 int err; 631 632 err = -ENOMEM; 633 rcu_read_lock(); 634 xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); 635 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); 636 rcu_read_unlock(); 637 if (xprt == NULL || xps == NULL) { 638 xprt_put(xprt); 639 xprt_switch_put(xps); 640 goto out_err; 641 } 642 args->servername = xprt->servername; 643 args->nodename = clnt->cl_nodename; 644 645 new = rpc_new_client(args, xps, xprt, clnt); 646 if (IS_ERR(new)) 647 return new; 648 649 /* Turn off autobind on clones */ 650 new->cl_autobind = 0; 651 new->cl_softrtry = clnt->cl_softrtry; 652 new->cl_softerr = clnt->cl_softerr; 653 new->cl_noretranstimeo = clnt->cl_noretranstimeo; 654 new->cl_discrtry = clnt->cl_discrtry; 655 new->cl_chatty = clnt->cl_chatty; 656 new->cl_netunreach_fatal = clnt->cl_netunreach_fatal; 657 new->cl_principal = clnt->cl_principal; 658 new->cl_max_connect = clnt->cl_max_connect; 659 return new; 660 661 out_err: 662 trace_rpc_clnt_clone_err(clnt, err); 663 return ERR_PTR(err); 664 } 665 666 /** 667 * rpc_clone_client - Clone an RPC client structure 668 * 669 * @clnt: RPC client whose parameters are copied 670 * 671 * Returns a fresh RPC client or an ERR_PTR. 672 */ 673 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) 674 { 675 struct rpc_create_args args = { 676 .program = clnt->cl_program, 677 .prognumber = clnt->cl_prog, 678 .version = clnt->cl_vers, 679 .authflavor = clnt->cl_auth->au_flavor, 680 .cred = clnt->cl_cred, 681 .stats = clnt->cl_stats, 682 }; 683 return __rpc_clone_client(&args, clnt); 684 } 685 EXPORT_SYMBOL_GPL(rpc_clone_client); 686 687 /** 688 * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth 689 * 690 * @clnt: RPC client whose parameters are copied 691 * @flavor: security flavor for new client 692 * 693 * Returns a fresh RPC client or an ERR_PTR. 694 */ 695 struct rpc_clnt * 696 rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 697 { 698 struct rpc_create_args args = { 699 .program = clnt->cl_program, 700 .prognumber = clnt->cl_prog, 701 .version = clnt->cl_vers, 702 .authflavor = flavor, 703 .cred = clnt->cl_cred, 704 .stats = clnt->cl_stats, 705 }; 706 return __rpc_clone_client(&args, clnt); 707 } 708 EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); 709 710 /** 711 * rpc_switch_client_transport: switch the RPC transport on the fly 712 * @clnt: pointer to a struct rpc_clnt 713 * @args: pointer to the new transport arguments 714 * @timeout: pointer to the new timeout parameters 715 * 716 * This function allows the caller to switch the RPC transport for the 717 * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS 718 * server, for instance. It assumes that the caller has ensured that 719 * there are no active RPC tasks by using some form of locking. 720 * 721 * Returns zero if "clnt" is now using the new xprt. Otherwise a 722 * negative errno is returned, and "clnt" continues to use the old 723 * xprt. 724 */ 725 int rpc_switch_client_transport(struct rpc_clnt *clnt, 726 struct xprt_create *args, 727 const struct rpc_timeout *timeout) 728 { 729 const struct rpc_timeout *old_timeo; 730 rpc_authflavor_t pseudoflavor; 731 struct rpc_xprt_switch *xps, *oldxps; 732 struct rpc_xprt *xprt, *old; 733 struct rpc_clnt *parent; 734 int err; 735 736 args->xprtsec = clnt->cl_xprtsec; 737 xprt = xprt_create_transport(args); 738 if (IS_ERR(xprt)) 739 return PTR_ERR(xprt); 740 741 xps = xprt_switch_alloc(xprt, GFP_KERNEL); 742 if (xps == NULL) { 743 xprt_put(xprt); 744 return -ENOMEM; 745 } 746 747 pseudoflavor = clnt->cl_auth->au_flavor; 748 749 old_timeo = clnt->cl_timeout; 750 old = rpc_clnt_set_transport(clnt, xprt, timeout); 751 oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps); 752 753 rpc_unregister_client(clnt); 754 __rpc_clnt_remove_pipedir(clnt); 755 rpc_sysfs_client_destroy(clnt); 756 rpc_clnt_debugfs_unregister(clnt); 757 758 /* 759 * A new transport was created. "clnt" therefore 760 * becomes the root of a new cl_parent tree. clnt's 761 * children, if it has any, still point to the old xprt. 762 */ 763 parent = clnt->cl_parent; 764 clnt->cl_parent = clnt; 765 766 /* 767 * The old rpc_auth cache cannot be re-used. GSS 768 * contexts in particular are between a single 769 * client and server. 770 */ 771 err = rpc_client_register(clnt, pseudoflavor, NULL); 772 if (err) 773 goto out_revert; 774 775 synchronize_rcu(); 776 if (parent != clnt) 777 rpc_release_client(parent); 778 xprt_switch_put(oldxps); 779 xprt_put(old); 780 trace_rpc_clnt_replace_xprt(clnt); 781 return 0; 782 783 out_revert: 784 xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps); 785 rpc_clnt_set_transport(clnt, old, old_timeo); 786 clnt->cl_parent = parent; 787 rpc_client_register(clnt, pseudoflavor, NULL); 788 xprt_switch_put(xps); 789 xprt_put(xprt); 790 trace_rpc_clnt_replace_xprt_err(clnt); 791 return err; 792 } 793 EXPORT_SYMBOL_GPL(rpc_switch_client_transport); 794 795 static struct rpc_xprt_switch *rpc_clnt_xprt_switch_get(struct rpc_clnt *clnt) 796 { 797 struct rpc_xprt_switch *xps; 798 799 rcu_read_lock(); 800 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); 801 rcu_read_unlock(); 802 803 return xps; 804 } 805 806 static 807 int _rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi, 808 void func(struct rpc_xprt_iter *xpi, struct rpc_xprt_switch *xps)) 809 { 810 struct rpc_xprt_switch *xps; 811 812 xps = rpc_clnt_xprt_switch_get(clnt); 813 if (xps == NULL) 814 return -EAGAIN; 815 func(xpi, xps); 816 xprt_switch_put(xps); 817 return 0; 818 } 819 820 static 821 int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi) 822 { 823 return _rpc_clnt_xprt_iter_init(clnt, xpi, xprt_iter_init_listall); 824 } 825 826 static 827 int rpc_clnt_xprt_iter_offline_init(struct rpc_clnt *clnt, 828 struct rpc_xprt_iter *xpi) 829 { 830 return _rpc_clnt_xprt_iter_init(clnt, xpi, xprt_iter_init_listoffline); 831 } 832 833 /** 834 * rpc_clnt_iterate_for_each_xprt - Apply a function to all transports 835 * @clnt: pointer to client 836 * @fn: function to apply 837 * @data: void pointer to function data 838 * 839 * Iterates through the list of RPC transports currently attached to the 840 * client and applies the function fn(clnt, xprt, data). 841 * 842 * On error, the iteration stops, and the function returns the error value. 843 */ 844 int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt, 845 int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *), 846 void *data) 847 { 848 struct rpc_xprt_iter xpi; 849 int ret; 850 851 ret = rpc_clnt_xprt_iter_init(clnt, &xpi); 852 if (ret) 853 return ret; 854 for (;;) { 855 struct rpc_xprt *xprt = xprt_iter_get_next(&xpi); 856 857 if (!xprt) 858 break; 859 ret = fn(clnt, xprt, data); 860 xprt_put(xprt); 861 if (ret < 0) 862 break; 863 } 864 xprt_iter_destroy(&xpi); 865 return ret; 866 } 867 EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt); 868 869 /* 870 * Kill all tasks for the given client. 871 * XXX: kill their descendants as well? 872 */ 873 void rpc_killall_tasks(struct rpc_clnt *clnt) 874 { 875 struct rpc_task *rovr; 876 877 878 if (list_empty(&clnt->cl_tasks)) 879 return; 880 881 /* 882 * Spin lock all_tasks to prevent changes... 883 */ 884 trace_rpc_clnt_killall(clnt); 885 spin_lock(&clnt->cl_lock); 886 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) 887 rpc_signal_task(rovr); 888 spin_unlock(&clnt->cl_lock); 889 } 890 EXPORT_SYMBOL_GPL(rpc_killall_tasks); 891 892 /** 893 * rpc_cancel_tasks - try to cancel a set of RPC tasks 894 * @clnt: Pointer to RPC client 895 * @error: RPC task error value to set 896 * @fnmatch: Pointer to selector function 897 * @data: User data 898 * 899 * Uses @fnmatch to define a set of RPC tasks that are to be cancelled. 900 * The argument @error must be a negative error value. 901 */ 902 unsigned long rpc_cancel_tasks(struct rpc_clnt *clnt, int error, 903 bool (*fnmatch)(const struct rpc_task *, 904 const void *), 905 const void *data) 906 { 907 struct rpc_task *task; 908 unsigned long count = 0; 909 910 if (list_empty(&clnt->cl_tasks)) 911 return 0; 912 /* 913 * Spin lock all_tasks to prevent changes... 914 */ 915 spin_lock(&clnt->cl_lock); 916 list_for_each_entry(task, &clnt->cl_tasks, tk_task) { 917 if (!RPC_IS_ACTIVATED(task)) 918 continue; 919 if (!fnmatch(task, data)) 920 continue; 921 rpc_task_try_cancel(task, error); 922 count++; 923 } 924 spin_unlock(&clnt->cl_lock); 925 return count; 926 } 927 EXPORT_SYMBOL_GPL(rpc_cancel_tasks); 928 929 static int rpc_clnt_disconnect_xprt(struct rpc_clnt *clnt, 930 struct rpc_xprt *xprt, void *dummy) 931 { 932 if (xprt_connected(xprt)) 933 xprt_force_disconnect(xprt); 934 return 0; 935 } 936 937 void rpc_clnt_disconnect(struct rpc_clnt *clnt) 938 { 939 rpc_clnt_iterate_for_each_xprt(clnt, rpc_clnt_disconnect_xprt, NULL); 940 } 941 EXPORT_SYMBOL_GPL(rpc_clnt_disconnect); 942 943 /* 944 * Properly shut down an RPC client, terminating all outstanding 945 * requests. 946 */ 947 void rpc_shutdown_client(struct rpc_clnt *clnt) 948 { 949 might_sleep(); 950 951 trace_rpc_clnt_shutdown(clnt); 952 953 clnt->cl_shutdown = 1; 954 while (!list_empty(&clnt->cl_tasks)) { 955 rpc_killall_tasks(clnt); 956 wait_event_timeout(destroy_wait, 957 list_empty(&clnt->cl_tasks), 1*HZ); 958 } 959 960 /* wait for tasks still in workqueue or waitqueue */ 961 wait_event_timeout(destroy_wait, 962 atomic_read(&clnt->cl_task_count) == 0, 1 * HZ); 963 964 rpc_release_client(clnt); 965 } 966 EXPORT_SYMBOL_GPL(rpc_shutdown_client); 967 968 /* 969 * Free an RPC client 970 */ 971 static void rpc_free_client_work(struct work_struct *work) 972 { 973 struct rpc_clnt *clnt = container_of(work, struct rpc_clnt, cl_work); 974 975 trace_rpc_clnt_free(clnt); 976 977 /* These might block on processes that might allocate memory, 978 * so they cannot be called in rpciod, so they are handled separately 979 * here. 980 */ 981 rpc_sysfs_client_destroy(clnt); 982 rpc_clnt_debugfs_unregister(clnt); 983 rpc_free_clid(clnt); 984 rpc_clnt_remove_pipedir(clnt); 985 xprt_put(rcu_dereference_raw(clnt->cl_xprt)); 986 987 kfree(clnt); 988 rpciod_down(); 989 } 990 static struct rpc_clnt * 991 rpc_free_client(struct rpc_clnt *clnt) 992 { 993 struct rpc_clnt *parent = NULL; 994 995 trace_rpc_clnt_release(clnt); 996 if (clnt->cl_parent != clnt) 997 parent = clnt->cl_parent; 998 rpc_unregister_client(clnt); 999 rpc_free_iostats(clnt->cl_metrics); 1000 clnt->cl_metrics = NULL; 1001 xprt_iter_destroy(&clnt->cl_xpi); 1002 put_cred(clnt->cl_cred); 1003 1004 INIT_WORK(&clnt->cl_work, rpc_free_client_work); 1005 schedule_work(&clnt->cl_work); 1006 return parent; 1007 } 1008 1009 /* 1010 * Free an RPC client 1011 */ 1012 static struct rpc_clnt * 1013 rpc_free_auth(struct rpc_clnt *clnt) 1014 { 1015 /* 1016 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to 1017 * release remaining GSS contexts. This mechanism ensures 1018 * that it can do so safely. 1019 */ 1020 if (clnt->cl_auth != NULL) { 1021 rpcauth_release(clnt->cl_auth); 1022 clnt->cl_auth = NULL; 1023 } 1024 if (refcount_dec_and_test(&clnt->cl_count)) 1025 return rpc_free_client(clnt); 1026 return NULL; 1027 } 1028 1029 /* 1030 * Release reference to the RPC client 1031 */ 1032 void 1033 rpc_release_client(struct rpc_clnt *clnt) 1034 { 1035 do { 1036 if (list_empty(&clnt->cl_tasks)) 1037 wake_up(&destroy_wait); 1038 if (refcount_dec_not_one(&clnt->cl_count)) 1039 break; 1040 clnt = rpc_free_auth(clnt); 1041 } while (clnt != NULL); 1042 } 1043 EXPORT_SYMBOL_GPL(rpc_release_client); 1044 1045 /** 1046 * rpc_bind_new_program - bind a new RPC program to an existing client 1047 * @old: old rpc_client 1048 * @program: rpc program to set 1049 * @vers: rpc program version 1050 * 1051 * Clones the rpc client and sets up a new RPC program. This is mainly 1052 * of use for enabling different RPC programs to share the same transport. 1053 * The Sun NFSv2/v3 ACL protocol can do this. 1054 */ 1055 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, 1056 const struct rpc_program *program, 1057 u32 vers) 1058 { 1059 struct rpc_create_args args = { 1060 .program = program, 1061 .prognumber = program->number, 1062 .version = vers, 1063 .authflavor = old->cl_auth->au_flavor, 1064 .cred = old->cl_cred, 1065 .stats = old->cl_stats, 1066 .timeout = old->cl_timeout, 1067 }; 1068 struct rpc_clnt *clnt; 1069 int err; 1070 1071 clnt = __rpc_clone_client(&args, old); 1072 if (IS_ERR(clnt)) 1073 goto out; 1074 err = rpc_ping(clnt); 1075 if (err != 0) { 1076 rpc_shutdown_client(clnt); 1077 clnt = ERR_PTR(err); 1078 } 1079 out: 1080 return clnt; 1081 } 1082 EXPORT_SYMBOL_GPL(rpc_bind_new_program); 1083 1084 struct rpc_xprt * 1085 rpc_task_get_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) 1086 { 1087 struct rpc_xprt_switch *xps; 1088 1089 if (!xprt) 1090 return NULL; 1091 rcu_read_lock(); 1092 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); 1093 atomic_long_inc(&xps->xps_queuelen); 1094 rcu_read_unlock(); 1095 atomic_long_inc(&xprt->queuelen); 1096 1097 return xprt; 1098 } 1099 1100 static void 1101 rpc_task_release_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) 1102 { 1103 struct rpc_xprt_switch *xps; 1104 1105 atomic_long_dec(&xprt->queuelen); 1106 rcu_read_lock(); 1107 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); 1108 atomic_long_dec(&xps->xps_queuelen); 1109 rcu_read_unlock(); 1110 1111 xprt_put(xprt); 1112 } 1113 1114 void rpc_task_release_transport(struct rpc_task *task) 1115 { 1116 struct rpc_xprt *xprt = task->tk_xprt; 1117 1118 if (xprt) { 1119 task->tk_xprt = NULL; 1120 if (task->tk_client) 1121 rpc_task_release_xprt(task->tk_client, xprt); 1122 else 1123 xprt_put(xprt); 1124 } 1125 } 1126 EXPORT_SYMBOL_GPL(rpc_task_release_transport); 1127 1128 void rpc_task_release_client(struct rpc_task *task) 1129 { 1130 struct rpc_clnt *clnt = task->tk_client; 1131 1132 rpc_task_release_transport(task); 1133 if (clnt != NULL) { 1134 /* Remove from client task list */ 1135 spin_lock(&clnt->cl_lock); 1136 list_del(&task->tk_task); 1137 spin_unlock(&clnt->cl_lock); 1138 task->tk_client = NULL; 1139 atomic_dec(&clnt->cl_task_count); 1140 1141 rpc_release_client(clnt); 1142 } 1143 } 1144 1145 static struct rpc_xprt * 1146 rpc_task_get_first_xprt(struct rpc_clnt *clnt) 1147 { 1148 struct rpc_xprt *xprt; 1149 1150 rcu_read_lock(); 1151 xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); 1152 rcu_read_unlock(); 1153 return rpc_task_get_xprt(clnt, xprt); 1154 } 1155 1156 static struct rpc_xprt * 1157 rpc_task_get_next_xprt(struct rpc_clnt *clnt) 1158 { 1159 return rpc_task_get_xprt(clnt, xprt_iter_get_next(&clnt->cl_xpi)); 1160 } 1161 1162 static 1163 void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt) 1164 { 1165 if (task->tk_xprt) { 1166 if (!(test_bit(XPRT_OFFLINE, &task->tk_xprt->state) && 1167 (task->tk_flags & RPC_TASK_MOVEABLE))) 1168 return; 1169 xprt_release(task); 1170 xprt_put(task->tk_xprt); 1171 } 1172 if (task->tk_flags & RPC_TASK_NO_ROUND_ROBIN) 1173 task->tk_xprt = rpc_task_get_first_xprt(clnt); 1174 else 1175 task->tk_xprt = rpc_task_get_next_xprt(clnt); 1176 } 1177 1178 static 1179 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) 1180 { 1181 rpc_task_set_transport(task, clnt); 1182 task->tk_client = clnt; 1183 refcount_inc(&clnt->cl_count); 1184 if (clnt->cl_softrtry) 1185 task->tk_flags |= RPC_TASK_SOFT; 1186 if (clnt->cl_softerr) 1187 task->tk_flags |= RPC_TASK_TIMEOUT; 1188 if (clnt->cl_noretranstimeo) 1189 task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT; 1190 if (clnt->cl_netunreach_fatal) 1191 task->tk_flags |= RPC_TASK_NETUNREACH_FATAL; 1192 atomic_inc(&clnt->cl_task_count); 1193 } 1194 1195 static void 1196 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) 1197 { 1198 if (msg != NULL) { 1199 task->tk_msg.rpc_proc = msg->rpc_proc; 1200 task->tk_msg.rpc_argp = msg->rpc_argp; 1201 task->tk_msg.rpc_resp = msg->rpc_resp; 1202 task->tk_msg.rpc_cred = msg->rpc_cred; 1203 if (!(task->tk_flags & RPC_TASK_CRED_NOREF)) 1204 get_cred(task->tk_msg.rpc_cred); 1205 } 1206 } 1207 1208 /* 1209 * Default callback for async RPC calls 1210 */ 1211 static void 1212 rpc_default_callback(struct rpc_task *task, void *data) 1213 { 1214 } 1215 1216 static const struct rpc_call_ops rpc_default_ops = { 1217 .rpc_call_done = rpc_default_callback, 1218 }; 1219 1220 /** 1221 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it 1222 * @task_setup_data: pointer to task initialisation data 1223 */ 1224 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) 1225 { 1226 struct rpc_task *task; 1227 1228 task = rpc_new_task(task_setup_data); 1229 if (IS_ERR(task)) 1230 return task; 1231 1232 if (!RPC_IS_ASYNC(task)) 1233 task->tk_flags |= RPC_TASK_CRED_NOREF; 1234 1235 rpc_task_set_client(task, task_setup_data->rpc_client); 1236 rpc_task_set_rpc_message(task, task_setup_data->rpc_message); 1237 1238 if (task->tk_action == NULL) 1239 rpc_call_start(task); 1240 1241 atomic_inc(&task->tk_count); 1242 rpc_execute(task); 1243 return task; 1244 } 1245 EXPORT_SYMBOL_GPL(rpc_run_task); 1246 1247 /** 1248 * rpc_call_sync - Perform a synchronous RPC call 1249 * @clnt: pointer to RPC client 1250 * @msg: RPC call parameters 1251 * @flags: RPC call flags 1252 */ 1253 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) 1254 { 1255 struct rpc_task *task; 1256 struct rpc_task_setup task_setup_data = { 1257 .rpc_client = clnt, 1258 .rpc_message = msg, 1259 .callback_ops = &rpc_default_ops, 1260 .flags = flags, 1261 }; 1262 int status; 1263 1264 WARN_ON_ONCE(flags & RPC_TASK_ASYNC); 1265 if (flags & RPC_TASK_ASYNC) { 1266 rpc_release_calldata(task_setup_data.callback_ops, 1267 task_setup_data.callback_data); 1268 return -EINVAL; 1269 } 1270 1271 task = rpc_run_task(&task_setup_data); 1272 if (IS_ERR(task)) 1273 return PTR_ERR(task); 1274 status = task->tk_status; 1275 rpc_put_task(task); 1276 return status; 1277 } 1278 EXPORT_SYMBOL_GPL(rpc_call_sync); 1279 1280 /** 1281 * rpc_call_async - Perform an asynchronous RPC call 1282 * @clnt: pointer to RPC client 1283 * @msg: RPC call parameters 1284 * @flags: RPC call flags 1285 * @tk_ops: RPC call ops 1286 * @data: user call data 1287 */ 1288 int 1289 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, 1290 const struct rpc_call_ops *tk_ops, void *data) 1291 { 1292 struct rpc_task *task; 1293 struct rpc_task_setup task_setup_data = { 1294 .rpc_client = clnt, 1295 .rpc_message = msg, 1296 .callback_ops = tk_ops, 1297 .callback_data = data, 1298 .flags = flags|RPC_TASK_ASYNC, 1299 }; 1300 1301 task = rpc_run_task(&task_setup_data); 1302 if (IS_ERR(task)) 1303 return PTR_ERR(task); 1304 rpc_put_task(task); 1305 return 0; 1306 } 1307 EXPORT_SYMBOL_GPL(rpc_call_async); 1308 1309 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1310 static void call_bc_encode(struct rpc_task *task); 1311 1312 /** 1313 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run 1314 * rpc_execute against it 1315 * @req: RPC request 1316 * @timeout: timeout values to use for this task 1317 */ 1318 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, 1319 struct rpc_timeout *timeout) 1320 { 1321 struct rpc_task *task; 1322 struct rpc_task_setup task_setup_data = { 1323 .callback_ops = &rpc_default_ops, 1324 .flags = RPC_TASK_SOFTCONN | 1325 RPC_TASK_NO_RETRANS_TIMEOUT, 1326 }; 1327 1328 dprintk("RPC: rpc_run_bc_task req= %p\n", req); 1329 /* 1330 * Create an rpc_task to send the data 1331 */ 1332 task = rpc_new_task(&task_setup_data); 1333 if (IS_ERR(task)) { 1334 xprt_free_bc_request(req); 1335 return task; 1336 } 1337 1338 xprt_init_bc_request(req, task, timeout); 1339 1340 task->tk_action = call_bc_encode; 1341 atomic_inc(&task->tk_count); 1342 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); 1343 rpc_execute(task); 1344 1345 dprintk("RPC: rpc_run_bc_task: task= %p\n", task); 1346 return task; 1347 } 1348 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1349 1350 /** 1351 * rpc_prepare_reply_pages - Prepare to receive a reply data payload into pages 1352 * @req: RPC request to prepare 1353 * @pages: vector of struct page pointers 1354 * @base: offset in first page where receive should start, in bytes 1355 * @len: expected size of the upper layer data payload, in bytes 1356 * @hdrsize: expected size of upper layer reply header, in XDR words 1357 * 1358 */ 1359 void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages, 1360 unsigned int base, unsigned int len, 1361 unsigned int hdrsize) 1362 { 1363 hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign; 1364 1365 xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len); 1366 trace_rpc_xdr_reply_pages(req->rq_task, &req->rq_rcv_buf); 1367 } 1368 EXPORT_SYMBOL_GPL(rpc_prepare_reply_pages); 1369 1370 void 1371 rpc_call_start(struct rpc_task *task) 1372 { 1373 task->tk_action = call_start; 1374 } 1375 EXPORT_SYMBOL_GPL(rpc_call_start); 1376 1377 /** 1378 * rpc_peeraddr - extract remote peer address from clnt's xprt 1379 * @clnt: RPC client structure 1380 * @buf: target buffer 1381 * @bufsize: length of target buffer 1382 * 1383 * Returns the number of bytes that are actually in the stored address. 1384 */ 1385 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) 1386 { 1387 size_t bytes; 1388 struct rpc_xprt *xprt; 1389 1390 rcu_read_lock(); 1391 xprt = rcu_dereference(clnt->cl_xprt); 1392 1393 bytes = xprt->addrlen; 1394 if (bytes > bufsize) 1395 bytes = bufsize; 1396 memcpy(buf, &xprt->addr, bytes); 1397 rcu_read_unlock(); 1398 1399 return bytes; 1400 } 1401 EXPORT_SYMBOL_GPL(rpc_peeraddr); 1402 1403 /** 1404 * rpc_peeraddr2str - return remote peer address in printable format 1405 * @clnt: RPC client structure 1406 * @format: address format 1407 * 1408 * NB: the lifetime of the memory referenced by the returned pointer is 1409 * the same as the rpc_xprt itself. As long as the caller uses this 1410 * pointer, it must hold the RCU read lock. 1411 */ 1412 const char *rpc_peeraddr2str(struct rpc_clnt *clnt, 1413 enum rpc_display_format_t format) 1414 { 1415 struct rpc_xprt *xprt; 1416 1417 xprt = rcu_dereference(clnt->cl_xprt); 1418 1419 if (xprt->address_strings[format] != NULL) 1420 return xprt->address_strings[format]; 1421 else 1422 return "unprintable"; 1423 } 1424 EXPORT_SYMBOL_GPL(rpc_peeraddr2str); 1425 1426 static const struct sockaddr_in rpc_inaddr_loopback = { 1427 .sin_family = AF_INET, 1428 .sin_addr.s_addr = htonl(INADDR_ANY), 1429 }; 1430 1431 static const struct sockaddr_in6 rpc_in6addr_loopback = { 1432 .sin6_family = AF_INET6, 1433 .sin6_addr = IN6ADDR_ANY_INIT, 1434 }; 1435 1436 /* 1437 * Try a getsockname() on a connected datagram socket. Using a 1438 * connected datagram socket prevents leaving a socket in TIME_WAIT. 1439 * This conserves the ephemeral port number space. 1440 * 1441 * Returns zero and fills in "buf" if successful; otherwise, a 1442 * negative errno is returned. 1443 */ 1444 static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, 1445 struct sockaddr *buf) 1446 { 1447 struct socket *sock; 1448 int err; 1449 1450 err = __sock_create(net, sap->sa_family, 1451 SOCK_DGRAM, IPPROTO_UDP, &sock, 1); 1452 if (err < 0) { 1453 dprintk("RPC: can't create UDP socket (%d)\n", err); 1454 goto out; 1455 } 1456 1457 switch (sap->sa_family) { 1458 case AF_INET: 1459 err = kernel_bind(sock, 1460 (struct sockaddr *)&rpc_inaddr_loopback, 1461 sizeof(rpc_inaddr_loopback)); 1462 break; 1463 case AF_INET6: 1464 err = kernel_bind(sock, 1465 (struct sockaddr *)&rpc_in6addr_loopback, 1466 sizeof(rpc_in6addr_loopback)); 1467 break; 1468 default: 1469 err = -EAFNOSUPPORT; 1470 goto out_release; 1471 } 1472 if (err < 0) { 1473 dprintk("RPC: can't bind UDP socket (%d)\n", err); 1474 goto out_release; 1475 } 1476 1477 err = kernel_connect(sock, sap, salen, 0); 1478 if (err < 0) { 1479 dprintk("RPC: can't connect UDP socket (%d)\n", err); 1480 goto out_release; 1481 } 1482 1483 err = kernel_getsockname(sock, buf); 1484 if (err < 0) { 1485 dprintk("RPC: getsockname failed (%d)\n", err); 1486 goto out_release; 1487 } 1488 1489 err = 0; 1490 if (buf->sa_family == AF_INET6) { 1491 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; 1492 sin6->sin6_scope_id = 0; 1493 } 1494 dprintk("RPC: %s succeeded\n", __func__); 1495 1496 out_release: 1497 sock_release(sock); 1498 out: 1499 return err; 1500 } 1501 1502 /* 1503 * Scraping a connected socket failed, so we don't have a useable 1504 * local address. Fallback: generate an address that will prevent 1505 * the server from calling us back. 1506 * 1507 * Returns zero and fills in "buf" if successful; otherwise, a 1508 * negative errno is returned. 1509 */ 1510 static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) 1511 { 1512 switch (family) { 1513 case AF_INET: 1514 if (buflen < sizeof(rpc_inaddr_loopback)) 1515 return -EINVAL; 1516 memcpy(buf, &rpc_inaddr_loopback, 1517 sizeof(rpc_inaddr_loopback)); 1518 break; 1519 case AF_INET6: 1520 if (buflen < sizeof(rpc_in6addr_loopback)) 1521 return -EINVAL; 1522 memcpy(buf, &rpc_in6addr_loopback, 1523 sizeof(rpc_in6addr_loopback)); 1524 break; 1525 default: 1526 dprintk("RPC: %s: address family not supported\n", 1527 __func__); 1528 return -EAFNOSUPPORT; 1529 } 1530 dprintk("RPC: %s: succeeded\n", __func__); 1531 return 0; 1532 } 1533 1534 /** 1535 * rpc_localaddr - discover local endpoint address for an RPC client 1536 * @clnt: RPC client structure 1537 * @buf: target buffer 1538 * @buflen: size of target buffer, in bytes 1539 * 1540 * Returns zero and fills in "buf" and "buflen" if successful; 1541 * otherwise, a negative errno is returned. 1542 * 1543 * This works even if the underlying transport is not currently connected, 1544 * or if the upper layer never previously provided a source address. 1545 * 1546 * The result of this function call is transient: multiple calls in 1547 * succession may give different results, depending on how local 1548 * networking configuration changes over time. 1549 */ 1550 int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) 1551 { 1552 struct sockaddr_storage address; 1553 struct sockaddr *sap = (struct sockaddr *)&address; 1554 struct rpc_xprt *xprt; 1555 struct net *net; 1556 size_t salen; 1557 int err; 1558 1559 rcu_read_lock(); 1560 xprt = rcu_dereference(clnt->cl_xprt); 1561 salen = xprt->addrlen; 1562 memcpy(sap, &xprt->addr, salen); 1563 net = get_net(xprt->xprt_net); 1564 rcu_read_unlock(); 1565 1566 rpc_set_port(sap, 0); 1567 err = rpc_sockname(net, sap, salen, buf); 1568 put_net(net); 1569 if (err != 0) 1570 /* Couldn't discover local address, return ANYADDR */ 1571 return rpc_anyaddr(sap->sa_family, buf, buflen); 1572 return 0; 1573 } 1574 EXPORT_SYMBOL_GPL(rpc_localaddr); 1575 1576 void 1577 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) 1578 { 1579 struct rpc_xprt *xprt; 1580 1581 rcu_read_lock(); 1582 xprt = rcu_dereference(clnt->cl_xprt); 1583 if (xprt->ops->set_buffer_size) 1584 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); 1585 rcu_read_unlock(); 1586 } 1587 EXPORT_SYMBOL_GPL(rpc_setbufsize); 1588 1589 /** 1590 * rpc_net_ns - Get the network namespace for this RPC client 1591 * @clnt: RPC client to query 1592 * 1593 */ 1594 struct net *rpc_net_ns(struct rpc_clnt *clnt) 1595 { 1596 struct net *ret; 1597 1598 rcu_read_lock(); 1599 ret = rcu_dereference(clnt->cl_xprt)->xprt_net; 1600 rcu_read_unlock(); 1601 return ret; 1602 } 1603 EXPORT_SYMBOL_GPL(rpc_net_ns); 1604 1605 /** 1606 * rpc_max_payload - Get maximum payload size for a transport, in bytes 1607 * @clnt: RPC client to query 1608 * 1609 * For stream transports, this is one RPC record fragment (see RFC 1610 * 1831), as we don't support multi-record requests yet. For datagram 1611 * transports, this is the size of an IP packet minus the IP, UDP, and 1612 * RPC header sizes. 1613 */ 1614 size_t rpc_max_payload(struct rpc_clnt *clnt) 1615 { 1616 size_t ret; 1617 1618 rcu_read_lock(); 1619 ret = rcu_dereference(clnt->cl_xprt)->max_payload; 1620 rcu_read_unlock(); 1621 return ret; 1622 } 1623 EXPORT_SYMBOL_GPL(rpc_max_payload); 1624 1625 /** 1626 * rpc_max_bc_payload - Get maximum backchannel payload size, in bytes 1627 * @clnt: RPC client to query 1628 */ 1629 size_t rpc_max_bc_payload(struct rpc_clnt *clnt) 1630 { 1631 struct rpc_xprt *xprt; 1632 size_t ret; 1633 1634 rcu_read_lock(); 1635 xprt = rcu_dereference(clnt->cl_xprt); 1636 ret = xprt->ops->bc_maxpayload(xprt); 1637 rcu_read_unlock(); 1638 return ret; 1639 } 1640 EXPORT_SYMBOL_GPL(rpc_max_bc_payload); 1641 1642 unsigned int rpc_num_bc_slots(struct rpc_clnt *clnt) 1643 { 1644 struct rpc_xprt *xprt; 1645 unsigned int ret; 1646 1647 rcu_read_lock(); 1648 xprt = rcu_dereference(clnt->cl_xprt); 1649 ret = xprt->ops->bc_num_slots(xprt); 1650 rcu_read_unlock(); 1651 return ret; 1652 } 1653 EXPORT_SYMBOL_GPL(rpc_num_bc_slots); 1654 1655 /** 1656 * rpc_force_rebind - force transport to check that remote port is unchanged 1657 * @clnt: client to rebind 1658 * 1659 */ 1660 void rpc_force_rebind(struct rpc_clnt *clnt) 1661 { 1662 if (clnt->cl_autobind) { 1663 rcu_read_lock(); 1664 xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); 1665 rcu_read_unlock(); 1666 } 1667 } 1668 EXPORT_SYMBOL_GPL(rpc_force_rebind); 1669 1670 static int 1671 __rpc_restart_call(struct rpc_task *task, void (*action)(struct rpc_task *)) 1672 { 1673 task->tk_status = 0; 1674 task->tk_rpc_status = 0; 1675 task->tk_action = action; 1676 return 1; 1677 } 1678 1679 /* 1680 * Restart an (async) RPC call. Usually called from within the 1681 * exit handler. 1682 */ 1683 int 1684 rpc_restart_call(struct rpc_task *task) 1685 { 1686 return __rpc_restart_call(task, call_start); 1687 } 1688 EXPORT_SYMBOL_GPL(rpc_restart_call); 1689 1690 /* 1691 * Restart an (async) RPC call from the call_prepare state. 1692 * Usually called from within the exit handler. 1693 */ 1694 int 1695 rpc_restart_call_prepare(struct rpc_task *task) 1696 { 1697 if (task->tk_ops->rpc_call_prepare != NULL) 1698 return __rpc_restart_call(task, rpc_prepare_task); 1699 return rpc_restart_call(task); 1700 } 1701 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); 1702 1703 const char 1704 *rpc_proc_name(const struct rpc_task *task) 1705 { 1706 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; 1707 1708 if (proc) { 1709 if (proc->p_name) 1710 return proc->p_name; 1711 else 1712 return "NULL"; 1713 } else 1714 return "no proc"; 1715 } 1716 1717 static void 1718 __rpc_call_rpcerror(struct rpc_task *task, int tk_status, int rpc_status) 1719 { 1720 trace_rpc_call_rpcerror(task, tk_status, rpc_status); 1721 rpc_task_set_rpc_status(task, rpc_status); 1722 rpc_exit(task, tk_status); 1723 } 1724 1725 static void 1726 rpc_call_rpcerror(struct rpc_task *task, int status) 1727 { 1728 __rpc_call_rpcerror(task, status, status); 1729 } 1730 1731 /* 1732 * 0. Initial state 1733 * 1734 * Other FSM states can be visited zero or more times, but 1735 * this state is visited exactly once for each RPC. 1736 */ 1737 static void 1738 call_start(struct rpc_task *task) 1739 { 1740 struct rpc_clnt *clnt = task->tk_client; 1741 int idx = task->tk_msg.rpc_proc->p_statidx; 1742 1743 trace_rpc_request(task); 1744 1745 if (task->tk_client->cl_shutdown) { 1746 rpc_call_rpcerror(task, -EIO); 1747 return; 1748 } 1749 1750 /* Increment call count (version might not be valid for ping) */ 1751 if (clnt->cl_program->version[clnt->cl_vers]) 1752 clnt->cl_program->version[clnt->cl_vers]->counts[idx]++; 1753 clnt->cl_stats->rpccnt++; 1754 task->tk_action = call_reserve; 1755 rpc_task_set_transport(task, clnt); 1756 } 1757 1758 /* 1759 * 1. Reserve an RPC call slot 1760 */ 1761 static void 1762 call_reserve(struct rpc_task *task) 1763 { 1764 task->tk_status = 0; 1765 task->tk_action = call_reserveresult; 1766 xprt_reserve(task); 1767 } 1768 1769 static void call_retry_reserve(struct rpc_task *task); 1770 1771 /* 1772 * 1b. Grok the result of xprt_reserve() 1773 */ 1774 static void 1775 call_reserveresult(struct rpc_task *task) 1776 { 1777 int status = task->tk_status; 1778 1779 /* 1780 * After a call to xprt_reserve(), we must have either 1781 * a request slot or else an error status. 1782 */ 1783 task->tk_status = 0; 1784 if (status >= 0) { 1785 if (task->tk_rqstp) { 1786 task->tk_action = call_refresh; 1787 1788 /* Add to the client's list of all tasks */ 1789 spin_lock(&task->tk_client->cl_lock); 1790 if (list_empty(&task->tk_task)) 1791 list_add_tail(&task->tk_task, &task->tk_client->cl_tasks); 1792 spin_unlock(&task->tk_client->cl_lock); 1793 return; 1794 } 1795 rpc_call_rpcerror(task, -EIO); 1796 return; 1797 } 1798 1799 switch (status) { 1800 case -ENOMEM: 1801 rpc_delay(task, HZ >> 2); 1802 fallthrough; 1803 case -EAGAIN: /* woken up; retry */ 1804 task->tk_action = call_retry_reserve; 1805 return; 1806 default: 1807 rpc_call_rpcerror(task, status); 1808 } 1809 } 1810 1811 /* 1812 * 1c. Retry reserving an RPC call slot 1813 */ 1814 static void 1815 call_retry_reserve(struct rpc_task *task) 1816 { 1817 task->tk_status = 0; 1818 task->tk_action = call_reserveresult; 1819 xprt_retry_reserve(task); 1820 } 1821 1822 /* 1823 * 2. Bind and/or refresh the credentials 1824 */ 1825 static void 1826 call_refresh(struct rpc_task *task) 1827 { 1828 task->tk_action = call_refreshresult; 1829 task->tk_status = 0; 1830 task->tk_client->cl_stats->rpcauthrefresh++; 1831 rpcauth_refreshcred(task); 1832 } 1833 1834 /* 1835 * 2a. Process the results of a credential refresh 1836 */ 1837 static void 1838 call_refreshresult(struct rpc_task *task) 1839 { 1840 int status = task->tk_status; 1841 1842 task->tk_status = 0; 1843 task->tk_action = call_refresh; 1844 switch (status) { 1845 case 0: 1846 if (rpcauth_uptodatecred(task)) { 1847 task->tk_action = call_allocate; 1848 return; 1849 } 1850 /* Use rate-limiting and a max number of retries if refresh 1851 * had status 0 but failed to update the cred. 1852 */ 1853 fallthrough; 1854 case -ETIMEDOUT: 1855 rpc_delay(task, 3*HZ); 1856 fallthrough; 1857 case -EAGAIN: 1858 status = -EACCES; 1859 if (!task->tk_cred_retry) 1860 break; 1861 task->tk_cred_retry--; 1862 trace_rpc_retry_refresh_status(task); 1863 return; 1864 case -EKEYEXPIRED: 1865 break; 1866 case -ENOMEM: 1867 rpc_delay(task, HZ >> 4); 1868 return; 1869 } 1870 trace_rpc_refresh_status(task); 1871 rpc_call_rpcerror(task, status); 1872 } 1873 1874 /* 1875 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. 1876 * (Note: buffer memory is freed in xprt_release). 1877 */ 1878 static void 1879 call_allocate(struct rpc_task *task) 1880 { 1881 const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth; 1882 struct rpc_rqst *req = task->tk_rqstp; 1883 struct rpc_xprt *xprt = req->rq_xprt; 1884 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; 1885 int status; 1886 1887 task->tk_status = 0; 1888 task->tk_action = call_encode; 1889 1890 if (req->rq_buffer) 1891 return; 1892 1893 /* 1894 * Calculate the size (in quads) of the RPC call 1895 * and reply headers, and convert both values 1896 * to byte sizes. 1897 */ 1898 req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) + 1899 proc->p_arglen; 1900 req->rq_callsize <<= 2; 1901 /* 1902 * Note: the reply buffer must at minimum allocate enough space 1903 * for the 'struct accepted_reply' from RFC5531. 1904 */ 1905 req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + \ 1906 max_t(size_t, proc->p_replen, 2); 1907 req->rq_rcvsize <<= 2; 1908 1909 status = xprt->ops->buf_alloc(task); 1910 trace_rpc_buf_alloc(task, status); 1911 if (status == 0) 1912 return; 1913 if (status != -ENOMEM) { 1914 rpc_call_rpcerror(task, status); 1915 return; 1916 } 1917 1918 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { 1919 task->tk_action = call_allocate; 1920 rpc_delay(task, HZ>>4); 1921 return; 1922 } 1923 1924 rpc_call_rpcerror(task, -ERESTARTSYS); 1925 } 1926 1927 static int 1928 rpc_task_need_encode(struct rpc_task *task) 1929 { 1930 return test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) == 0 && 1931 (!(task->tk_flags & RPC_TASK_SENT) || 1932 !(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) || 1933 xprt_request_need_retransmit(task)); 1934 } 1935 1936 static void 1937 rpc_xdr_encode(struct rpc_task *task) 1938 { 1939 struct rpc_rqst *req = task->tk_rqstp; 1940 struct xdr_stream xdr; 1941 1942 xdr_buf_init(&req->rq_snd_buf, 1943 req->rq_buffer, 1944 req->rq_callsize); 1945 xdr_buf_init(&req->rq_rcv_buf, 1946 req->rq_rbuffer, 1947 req->rq_rcvsize); 1948 1949 req->rq_reply_bytes_recvd = 0; 1950 req->rq_snd_buf.head[0].iov_len = 0; 1951 xdr_init_encode(&xdr, &req->rq_snd_buf, 1952 req->rq_snd_buf.head[0].iov_base, req); 1953 if (rpc_encode_header(task, &xdr)) 1954 return; 1955 1956 task->tk_status = rpcauth_wrap_req(task, &xdr); 1957 } 1958 1959 /* 1960 * 3. Encode arguments of an RPC call 1961 */ 1962 static void 1963 call_encode(struct rpc_task *task) 1964 { 1965 if (!rpc_task_need_encode(task)) 1966 goto out; 1967 1968 /* Dequeue task from the receive queue while we're encoding */ 1969 xprt_request_dequeue_xprt(task); 1970 /* Encode here so that rpcsec_gss can use correct sequence number. */ 1971 rpc_xdr_encode(task); 1972 /* Add task to reply queue before transmission to avoid races */ 1973 if (task->tk_status == 0 && rpc_reply_expected(task)) 1974 task->tk_status = xprt_request_enqueue_receive(task); 1975 /* Did the encode result in an error condition? */ 1976 if (task->tk_status != 0) { 1977 /* Was the error nonfatal? */ 1978 switch (task->tk_status) { 1979 case -EAGAIN: 1980 case -ENOMEM: 1981 rpc_delay(task, HZ >> 4); 1982 break; 1983 case -EKEYEXPIRED: 1984 if (!task->tk_cred_retry) { 1985 rpc_call_rpcerror(task, task->tk_status); 1986 } else { 1987 task->tk_action = call_refresh; 1988 task->tk_cred_retry--; 1989 trace_rpc_retry_refresh_status(task); 1990 } 1991 break; 1992 default: 1993 rpc_call_rpcerror(task, task->tk_status); 1994 } 1995 return; 1996 } 1997 1998 xprt_request_enqueue_transmit(task); 1999 out: 2000 task->tk_action = call_transmit; 2001 /* Check that the connection is OK */ 2002 if (!xprt_bound(task->tk_xprt)) 2003 task->tk_action = call_bind; 2004 else if (!xprt_connected(task->tk_xprt)) 2005 task->tk_action = call_connect; 2006 } 2007 2008 /* 2009 * Helpers to check if the task was already transmitted, and 2010 * to take action when that is the case. 2011 */ 2012 static bool 2013 rpc_task_transmitted(struct rpc_task *task) 2014 { 2015 return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); 2016 } 2017 2018 static void 2019 rpc_task_handle_transmitted(struct rpc_task *task) 2020 { 2021 xprt_end_transmit(task); 2022 task->tk_action = call_transmit_status; 2023 } 2024 2025 /* 2026 * 4. Get the server port number if not yet set 2027 */ 2028 static void 2029 call_bind(struct rpc_task *task) 2030 { 2031 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; 2032 2033 if (rpc_task_transmitted(task)) { 2034 rpc_task_handle_transmitted(task); 2035 return; 2036 } 2037 2038 if (xprt_bound(xprt)) { 2039 task->tk_action = call_connect; 2040 return; 2041 } 2042 2043 task->tk_action = call_bind_status; 2044 if (!xprt_prepare_transmit(task)) 2045 return; 2046 2047 xprt->ops->rpcbind(task); 2048 } 2049 2050 /* 2051 * 4a. Sort out bind result 2052 */ 2053 static void 2054 call_bind_status(struct rpc_task *task) 2055 { 2056 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; 2057 int status = -EIO; 2058 2059 if (rpc_task_transmitted(task)) { 2060 rpc_task_handle_transmitted(task); 2061 return; 2062 } 2063 2064 if (task->tk_status >= 0) 2065 goto out_next; 2066 if (xprt_bound(xprt)) { 2067 task->tk_status = 0; 2068 goto out_next; 2069 } 2070 2071 switch (task->tk_status) { 2072 case -ENOMEM: 2073 rpc_delay(task, HZ >> 2); 2074 goto retry_timeout; 2075 case -EACCES: 2076 trace_rpcb_prog_unavail_err(task); 2077 /* fail immediately if this is an RPC ping */ 2078 if (task->tk_msg.rpc_proc->p_proc == 0) { 2079 status = -EOPNOTSUPP; 2080 break; 2081 } 2082 rpc_delay(task, 3*HZ); 2083 goto retry_timeout; 2084 case -ENOBUFS: 2085 rpc_delay(task, HZ >> 2); 2086 goto retry_timeout; 2087 case -EAGAIN: 2088 goto retry_timeout; 2089 case -ETIMEDOUT: 2090 trace_rpcb_timeout_err(task); 2091 goto retry_timeout; 2092 case -EPFNOSUPPORT: 2093 /* server doesn't support any rpcbind version we know of */ 2094 trace_rpcb_bind_version_err(task); 2095 break; 2096 case -EPROTONOSUPPORT: 2097 trace_rpcb_bind_version_err(task); 2098 goto retry_timeout; 2099 case -ENETDOWN: 2100 case -ENETUNREACH: 2101 if (task->tk_flags & RPC_TASK_NETUNREACH_FATAL) 2102 break; 2103 fallthrough; 2104 case -ECONNREFUSED: /* connection problems */ 2105 case -ECONNRESET: 2106 case -ECONNABORTED: 2107 case -ENOTCONN: 2108 case -EHOSTDOWN: 2109 case -EHOSTUNREACH: 2110 case -EPIPE: 2111 trace_rpcb_unreachable_err(task); 2112 if (!RPC_IS_SOFTCONN(task)) { 2113 rpc_delay(task, 5*HZ); 2114 goto retry_timeout; 2115 } 2116 status = task->tk_status; 2117 break; 2118 default: 2119 trace_rpcb_unrecognized_err(task); 2120 } 2121 2122 rpc_call_rpcerror(task, status); 2123 return; 2124 out_next: 2125 task->tk_action = call_connect; 2126 return; 2127 retry_timeout: 2128 task->tk_status = 0; 2129 task->tk_action = call_bind; 2130 rpc_check_timeout(task); 2131 } 2132 2133 /* 2134 * 4b. Connect to the RPC server 2135 */ 2136 static void 2137 call_connect(struct rpc_task *task) 2138 { 2139 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; 2140 2141 if (rpc_task_transmitted(task)) { 2142 rpc_task_handle_transmitted(task); 2143 return; 2144 } 2145 2146 if (xprt_connected(xprt)) { 2147 task->tk_action = call_transmit; 2148 return; 2149 } 2150 2151 task->tk_action = call_connect_status; 2152 if (task->tk_status < 0) 2153 return; 2154 if (task->tk_flags & RPC_TASK_NOCONNECT) { 2155 rpc_call_rpcerror(task, -ENOTCONN); 2156 return; 2157 } 2158 if (!xprt_prepare_transmit(task)) 2159 return; 2160 xprt_connect(task); 2161 } 2162 2163 /* 2164 * 4c. Sort out connect result 2165 */ 2166 static void 2167 call_connect_status(struct rpc_task *task) 2168 { 2169 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; 2170 struct rpc_clnt *clnt = task->tk_client; 2171 int status = task->tk_status; 2172 2173 if (rpc_task_transmitted(task)) { 2174 rpc_task_handle_transmitted(task); 2175 return; 2176 } 2177 2178 trace_rpc_connect_status(task); 2179 2180 if (task->tk_status == 0) { 2181 clnt->cl_stats->netreconn++; 2182 goto out_next; 2183 } 2184 if (xprt_connected(xprt)) { 2185 task->tk_status = 0; 2186 goto out_next; 2187 } 2188 2189 task->tk_status = 0; 2190 switch (status) { 2191 case -ENETDOWN: 2192 case -ENETUNREACH: 2193 if (task->tk_flags & RPC_TASK_NETUNREACH_FATAL) 2194 break; 2195 fallthrough; 2196 case -ECONNREFUSED: 2197 case -ECONNRESET: 2198 /* A positive refusal suggests a rebind is needed. */ 2199 if (clnt->cl_autobind) { 2200 rpc_force_rebind(clnt); 2201 if (RPC_IS_SOFTCONN(task)) 2202 break; 2203 goto out_retry; 2204 } 2205 fallthrough; 2206 case -ECONNABORTED: 2207 case -EHOSTUNREACH: 2208 case -EPIPE: 2209 case -EPROTO: 2210 xprt_conditional_disconnect(task->tk_rqstp->rq_xprt, 2211 task->tk_rqstp->rq_connect_cookie); 2212 if (RPC_IS_SOFTCONN(task)) 2213 break; 2214 /* retry with existing socket, after a delay */ 2215 rpc_delay(task, 3*HZ); 2216 fallthrough; 2217 case -EADDRINUSE: 2218 case -ENOTCONN: 2219 case -EAGAIN: 2220 case -ETIMEDOUT: 2221 if (!(task->tk_flags & RPC_TASK_NO_ROUND_ROBIN) && 2222 (task->tk_flags & RPC_TASK_MOVEABLE) && 2223 test_bit(XPRT_REMOVE, &xprt->state)) { 2224 struct rpc_xprt *saved = task->tk_xprt; 2225 struct rpc_xprt_switch *xps; 2226 2227 xps = rpc_clnt_xprt_switch_get(clnt); 2228 if (xps->xps_nxprts > 1) { 2229 long value; 2230 2231 xprt_release(task); 2232 value = atomic_long_dec_return(&xprt->queuelen); 2233 if (value == 0) 2234 rpc_xprt_switch_remove_xprt(xps, saved, 2235 true); 2236 xprt_put(saved); 2237 task->tk_xprt = NULL; 2238 task->tk_action = call_start; 2239 } 2240 xprt_switch_put(xps); 2241 if (!task->tk_xprt) 2242 goto out; 2243 } 2244 goto out_retry; 2245 case -ENOBUFS: 2246 rpc_delay(task, HZ >> 2); 2247 goto out_retry; 2248 } 2249 rpc_call_rpcerror(task, status); 2250 return; 2251 out_next: 2252 task->tk_action = call_transmit; 2253 return; 2254 out_retry: 2255 /* Check for timeouts before looping back to call_bind */ 2256 task->tk_action = call_bind; 2257 out: 2258 rpc_check_timeout(task); 2259 } 2260 2261 /* 2262 * 5. Transmit the RPC request, and wait for reply 2263 */ 2264 static void 2265 call_transmit(struct rpc_task *task) 2266 { 2267 if (rpc_task_transmitted(task)) { 2268 rpc_task_handle_transmitted(task); 2269 return; 2270 } 2271 2272 task->tk_action = call_transmit_status; 2273 if (!xprt_prepare_transmit(task)) 2274 return; 2275 task->tk_status = 0; 2276 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) { 2277 if (!xprt_connected(task->tk_xprt)) { 2278 task->tk_status = -ENOTCONN; 2279 return; 2280 } 2281 xprt_transmit(task); 2282 } 2283 xprt_end_transmit(task); 2284 } 2285 2286 /* 2287 * 5a. Handle cleanup after a transmission 2288 */ 2289 static void 2290 call_transmit_status(struct rpc_task *task) 2291 { 2292 task->tk_action = call_status; 2293 2294 /* 2295 * Common case: success. Force the compiler to put this 2296 * test first. 2297 */ 2298 if (rpc_task_transmitted(task)) { 2299 task->tk_status = 0; 2300 xprt_request_wait_receive(task); 2301 return; 2302 } 2303 2304 switch (task->tk_status) { 2305 default: 2306 break; 2307 case -EBADMSG: 2308 task->tk_status = 0; 2309 task->tk_action = call_encode; 2310 break; 2311 /* 2312 * Special cases: if we've been waiting on the 2313 * socket's write_space() callback, or if the 2314 * socket just returned a connection error, 2315 * then hold onto the transport lock. 2316 */ 2317 case -ENOMEM: 2318 case -ENOBUFS: 2319 rpc_delay(task, HZ>>2); 2320 fallthrough; 2321 case -EBADSLT: 2322 case -EAGAIN: 2323 task->tk_action = call_transmit; 2324 task->tk_status = 0; 2325 break; 2326 case -EHOSTDOWN: 2327 case -ENETDOWN: 2328 case -EHOSTUNREACH: 2329 case -ENETUNREACH: 2330 case -EPERM: 2331 break; 2332 case -ECONNREFUSED: 2333 if (RPC_IS_SOFTCONN(task)) { 2334 if (!task->tk_msg.rpc_proc->p_proc) 2335 trace_xprt_ping(task->tk_xprt, 2336 task->tk_status); 2337 rpc_call_rpcerror(task, task->tk_status); 2338 return; 2339 } 2340 fallthrough; 2341 case -ECONNRESET: 2342 case -ECONNABORTED: 2343 case -EADDRINUSE: 2344 case -ENOTCONN: 2345 case -EPIPE: 2346 task->tk_action = call_bind; 2347 task->tk_status = 0; 2348 break; 2349 } 2350 rpc_check_timeout(task); 2351 } 2352 2353 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 2354 static void call_bc_transmit(struct rpc_task *task); 2355 static void call_bc_transmit_status(struct rpc_task *task); 2356 2357 static void 2358 call_bc_encode(struct rpc_task *task) 2359 { 2360 xprt_request_enqueue_transmit(task); 2361 task->tk_action = call_bc_transmit; 2362 } 2363 2364 /* 2365 * 5b. Send the backchannel RPC reply. On error, drop the reply. In 2366 * addition, disconnect on connectivity errors. 2367 */ 2368 static void 2369 call_bc_transmit(struct rpc_task *task) 2370 { 2371 task->tk_action = call_bc_transmit_status; 2372 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) { 2373 if (!xprt_prepare_transmit(task)) 2374 return; 2375 task->tk_status = 0; 2376 xprt_transmit(task); 2377 } 2378 xprt_end_transmit(task); 2379 } 2380 2381 static void 2382 call_bc_transmit_status(struct rpc_task *task) 2383 { 2384 struct rpc_rqst *req = task->tk_rqstp; 2385 2386 if (rpc_task_transmitted(task)) 2387 task->tk_status = 0; 2388 2389 switch (task->tk_status) { 2390 case 0: 2391 /* Success */ 2392 case -ENETDOWN: 2393 case -EHOSTDOWN: 2394 case -EHOSTUNREACH: 2395 case -ENETUNREACH: 2396 case -ECONNRESET: 2397 case -ECONNREFUSED: 2398 case -EADDRINUSE: 2399 case -ENOTCONN: 2400 case -EPIPE: 2401 break; 2402 case -ENOMEM: 2403 case -ENOBUFS: 2404 rpc_delay(task, HZ>>2); 2405 fallthrough; 2406 case -EBADSLT: 2407 case -EAGAIN: 2408 task->tk_status = 0; 2409 task->tk_action = call_bc_transmit; 2410 return; 2411 case -ETIMEDOUT: 2412 /* 2413 * Problem reaching the server. Disconnect and let the 2414 * forechannel reestablish the connection. The server will 2415 * have to retransmit the backchannel request and we'll 2416 * reprocess it. Since these ops are idempotent, there's no 2417 * need to cache our reply at this time. 2418 */ 2419 printk(KERN_NOTICE "RPC: Could not send backchannel reply " 2420 "error: %d\n", task->tk_status); 2421 xprt_conditional_disconnect(req->rq_xprt, 2422 req->rq_connect_cookie); 2423 break; 2424 default: 2425 /* 2426 * We were unable to reply and will have to drop the 2427 * request. The server should reconnect and retransmit. 2428 */ 2429 printk(KERN_NOTICE "RPC: Could not send backchannel reply " 2430 "error: %d\n", task->tk_status); 2431 break; 2432 } 2433 task->tk_action = rpc_exit_task; 2434 } 2435 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 2436 2437 /* 2438 * 6. Sort out the RPC call status 2439 */ 2440 static void 2441 call_status(struct rpc_task *task) 2442 { 2443 struct rpc_clnt *clnt = task->tk_client; 2444 int status; 2445 2446 if (!task->tk_msg.rpc_proc->p_proc) 2447 trace_xprt_ping(task->tk_xprt, task->tk_status); 2448 2449 status = task->tk_status; 2450 if (status >= 0) { 2451 task->tk_action = call_decode; 2452 return; 2453 } 2454 2455 trace_rpc_call_status(task); 2456 task->tk_status = 0; 2457 switch(status) { 2458 case -ENETDOWN: 2459 case -ENETUNREACH: 2460 if (task->tk_flags & RPC_TASK_NETUNREACH_FATAL) 2461 goto out_exit; 2462 fallthrough; 2463 case -EHOSTDOWN: 2464 case -EHOSTUNREACH: 2465 case -EPERM: 2466 if (RPC_IS_SOFTCONN(task)) 2467 goto out_exit; 2468 /* 2469 * Delay any retries for 3 seconds, then handle as if it 2470 * were a timeout. 2471 */ 2472 rpc_delay(task, 3*HZ); 2473 fallthrough; 2474 case -ETIMEDOUT: 2475 break; 2476 case -ECONNREFUSED: 2477 case -ECONNRESET: 2478 case -ECONNABORTED: 2479 case -ENOTCONN: 2480 rpc_force_rebind(clnt); 2481 break; 2482 case -EADDRINUSE: 2483 rpc_delay(task, 3*HZ); 2484 fallthrough; 2485 case -EPIPE: 2486 case -EAGAIN: 2487 break; 2488 case -ENFILE: 2489 case -ENOBUFS: 2490 case -ENOMEM: 2491 rpc_delay(task, HZ>>2); 2492 break; 2493 case -EIO: 2494 /* shutdown or soft timeout */ 2495 goto out_exit; 2496 default: 2497 if (clnt->cl_chatty) 2498 printk("%s: RPC call returned error %d\n", 2499 clnt->cl_program->name, -status); 2500 goto out_exit; 2501 } 2502 task->tk_action = call_encode; 2503 rpc_check_timeout(task); 2504 return; 2505 out_exit: 2506 rpc_call_rpcerror(task, status); 2507 } 2508 2509 static bool 2510 rpc_check_connected(const struct rpc_rqst *req) 2511 { 2512 /* No allocated request or transport? return true */ 2513 if (!req || !req->rq_xprt) 2514 return true; 2515 return xprt_connected(req->rq_xprt); 2516 } 2517 2518 static void 2519 rpc_check_timeout(struct rpc_task *task) 2520 { 2521 struct rpc_clnt *clnt = task->tk_client; 2522 2523 if (RPC_SIGNALLED(task)) 2524 return; 2525 2526 if (xprt_adjust_timeout(task->tk_rqstp) == 0) 2527 return; 2528 2529 trace_rpc_timeout_status(task); 2530 task->tk_timeouts++; 2531 2532 if (RPC_IS_SOFTCONN(task) && !rpc_check_connected(task->tk_rqstp)) { 2533 rpc_call_rpcerror(task, -ETIMEDOUT); 2534 return; 2535 } 2536 2537 if (RPC_IS_SOFT(task)) { 2538 /* 2539 * Once a "no retrans timeout" soft tasks (a.k.a NFSv4) has 2540 * been sent, it should time out only if the transport 2541 * connection gets terminally broken. 2542 */ 2543 if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) && 2544 rpc_check_connected(task->tk_rqstp)) 2545 return; 2546 2547 if (clnt->cl_chatty) { 2548 pr_notice_ratelimited( 2549 "%s: server %s not responding, timed out\n", 2550 clnt->cl_program->name, 2551 task->tk_xprt->servername); 2552 } 2553 if (task->tk_flags & RPC_TASK_TIMEOUT) 2554 rpc_call_rpcerror(task, -ETIMEDOUT); 2555 else 2556 __rpc_call_rpcerror(task, -EIO, -ETIMEDOUT); 2557 return; 2558 } 2559 2560 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { 2561 task->tk_flags |= RPC_CALL_MAJORSEEN; 2562 if (clnt->cl_chatty) { 2563 pr_notice_ratelimited( 2564 "%s: server %s not responding, still trying\n", 2565 clnt->cl_program->name, 2566 task->tk_xprt->servername); 2567 } 2568 } 2569 rpc_force_rebind(clnt); 2570 /* 2571 * Did our request time out due to an RPCSEC_GSS out-of-sequence 2572 * event? RFC2203 requires the server to drop all such requests. 2573 */ 2574 rpcauth_invalcred(task); 2575 } 2576 2577 /* 2578 * 7. Decode the RPC reply 2579 */ 2580 static void 2581 call_decode(struct rpc_task *task) 2582 { 2583 struct rpc_clnt *clnt = task->tk_client; 2584 struct rpc_rqst *req = task->tk_rqstp; 2585 struct xdr_stream xdr; 2586 int err; 2587 2588 if (!task->tk_msg.rpc_proc->p_decode) { 2589 task->tk_action = rpc_exit_task; 2590 return; 2591 } 2592 2593 if (task->tk_flags & RPC_CALL_MAJORSEEN) { 2594 if (clnt->cl_chatty) { 2595 pr_notice_ratelimited("%s: server %s OK\n", 2596 clnt->cl_program->name, 2597 task->tk_xprt->servername); 2598 } 2599 task->tk_flags &= ~RPC_CALL_MAJORSEEN; 2600 } 2601 2602 /* 2603 * Did we ever call xprt_complete_rqst()? If not, we should assume 2604 * the message is incomplete. 2605 */ 2606 err = -EAGAIN; 2607 if (!req->rq_reply_bytes_recvd) 2608 goto out; 2609 2610 /* Ensure that we see all writes made by xprt_complete_rqst() 2611 * before it changed req->rq_reply_bytes_recvd. 2612 */ 2613 smp_rmb(); 2614 2615 req->rq_rcv_buf.len = req->rq_private_buf.len; 2616 trace_rpc_xdr_recvfrom(task, &req->rq_rcv_buf); 2617 2618 /* Check that the softirq receive buffer is valid */ 2619 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, 2620 sizeof(req->rq_rcv_buf)) != 0); 2621 2622 xdr_init_decode(&xdr, &req->rq_rcv_buf, 2623 req->rq_rcv_buf.head[0].iov_base, req); 2624 err = rpc_decode_header(task, &xdr); 2625 out: 2626 switch (err) { 2627 case 0: 2628 task->tk_action = rpc_exit_task; 2629 task->tk_status = rpcauth_unwrap_resp(task, &xdr); 2630 xdr_finish_decode(&xdr); 2631 return; 2632 case -EAGAIN: 2633 task->tk_status = 0; 2634 if (task->tk_client->cl_discrtry) 2635 xprt_conditional_disconnect(req->rq_xprt, 2636 req->rq_connect_cookie); 2637 task->tk_action = call_encode; 2638 rpc_check_timeout(task); 2639 break; 2640 case -EKEYREJECTED: 2641 task->tk_action = call_reserve; 2642 rpc_check_timeout(task); 2643 rpcauth_invalcred(task); 2644 /* Ensure we obtain a new XID if we retry! */ 2645 xprt_release(task); 2646 } 2647 } 2648 2649 static int 2650 rpc_encode_header(struct rpc_task *task, struct xdr_stream *xdr) 2651 { 2652 struct rpc_clnt *clnt = task->tk_client; 2653 struct rpc_rqst *req = task->tk_rqstp; 2654 __be32 *p; 2655 int error; 2656 2657 error = -EMSGSIZE; 2658 p = xdr_reserve_space(xdr, RPC_CALLHDRSIZE << 2); 2659 if (!p) 2660 goto out_fail; 2661 *p++ = req->rq_xid; 2662 *p++ = rpc_call; 2663 *p++ = cpu_to_be32(RPC_VERSION); 2664 *p++ = cpu_to_be32(clnt->cl_prog); 2665 *p++ = cpu_to_be32(clnt->cl_vers); 2666 *p = cpu_to_be32(task->tk_msg.rpc_proc->p_proc); 2667 2668 error = rpcauth_marshcred(task, xdr); 2669 if (error < 0) 2670 goto out_fail; 2671 return 0; 2672 out_fail: 2673 trace_rpc_bad_callhdr(task); 2674 rpc_call_rpcerror(task, error); 2675 return error; 2676 } 2677 2678 static noinline int 2679 rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr) 2680 { 2681 struct rpc_clnt *clnt = task->tk_client; 2682 int error; 2683 __be32 *p; 2684 2685 /* RFC-1014 says that the representation of XDR data must be a 2686 * multiple of four bytes 2687 * - if it isn't pointer subtraction in the NFS client may give 2688 * undefined results 2689 */ 2690 if (task->tk_rqstp->rq_rcv_buf.len & 3) 2691 goto out_unparsable; 2692 2693 p = xdr_inline_decode(xdr, 3 * sizeof(*p)); 2694 if (!p) 2695 goto out_unparsable; 2696 p++; /* skip XID */ 2697 if (*p++ != rpc_reply) 2698 goto out_unparsable; 2699 if (*p++ != rpc_msg_accepted) 2700 goto out_msg_denied; 2701 2702 error = rpcauth_checkverf(task, xdr); 2703 if (error) { 2704 struct rpc_cred *cred = task->tk_rqstp->rq_cred; 2705 2706 if (!test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 2707 rpcauth_invalcred(task); 2708 if (!task->tk_cred_retry) 2709 goto out_err; 2710 task->tk_cred_retry--; 2711 trace_rpc__stale_creds(task); 2712 return -EKEYREJECTED; 2713 } 2714 goto out_verifier; 2715 } 2716 2717 p = xdr_inline_decode(xdr, sizeof(*p)); 2718 if (!p) 2719 goto out_unparsable; 2720 switch (*p) { 2721 case rpc_success: 2722 return 0; 2723 case rpc_prog_unavail: 2724 trace_rpc__prog_unavail(task); 2725 error = -EPFNOSUPPORT; 2726 goto out_err; 2727 case rpc_prog_mismatch: 2728 trace_rpc__prog_mismatch(task); 2729 error = -EPROTONOSUPPORT; 2730 goto out_err; 2731 case rpc_proc_unavail: 2732 trace_rpc__proc_unavail(task); 2733 error = -EOPNOTSUPP; 2734 goto out_err; 2735 case rpc_garbage_args: 2736 case rpc_system_err: 2737 trace_rpc__garbage_args(task); 2738 error = -EIO; 2739 break; 2740 default: 2741 goto out_unparsable; 2742 } 2743 2744 out_garbage: 2745 clnt->cl_stats->rpcgarbage++; 2746 if (task->tk_garb_retry) { 2747 task->tk_garb_retry--; 2748 task->tk_action = call_encode; 2749 return -EAGAIN; 2750 } 2751 out_err: 2752 rpc_call_rpcerror(task, error); 2753 return error; 2754 2755 out_unparsable: 2756 trace_rpc__unparsable(task); 2757 error = -EIO; 2758 goto out_garbage; 2759 2760 out_verifier: 2761 trace_rpc_bad_verifier(task); 2762 switch (error) { 2763 case -EPROTONOSUPPORT: 2764 goto out_err; 2765 case -EACCES: 2766 /* possible RPCSEC_GSS out-of-sequence event (RFC2203), 2767 * reset recv state and keep waiting, don't retransmit 2768 */ 2769 task->tk_rqstp->rq_reply_bytes_recvd = 0; 2770 task->tk_status = xprt_request_enqueue_receive(task); 2771 task->tk_action = call_transmit_status; 2772 return -EBADMSG; 2773 default: 2774 goto out_garbage; 2775 } 2776 2777 out_msg_denied: 2778 error = -EACCES; 2779 p = xdr_inline_decode(xdr, sizeof(*p)); 2780 if (!p) 2781 goto out_unparsable; 2782 switch (*p++) { 2783 case rpc_auth_error: 2784 break; 2785 case rpc_mismatch: 2786 trace_rpc__mismatch(task); 2787 error = -EPROTONOSUPPORT; 2788 goto out_err; 2789 default: 2790 goto out_unparsable; 2791 } 2792 2793 p = xdr_inline_decode(xdr, sizeof(*p)); 2794 if (!p) 2795 goto out_unparsable; 2796 switch (*p++) { 2797 case rpc_autherr_rejectedcred: 2798 case rpc_autherr_rejectedverf: 2799 case rpcsec_gsserr_credproblem: 2800 case rpcsec_gsserr_ctxproblem: 2801 rpcauth_invalcred(task); 2802 if (!task->tk_cred_retry) 2803 break; 2804 task->tk_cred_retry--; 2805 trace_rpc__stale_creds(task); 2806 return -EKEYREJECTED; 2807 case rpc_autherr_badcred: 2808 case rpc_autherr_badverf: 2809 /* possibly garbled cred/verf? */ 2810 if (!task->tk_garb_retry) 2811 break; 2812 task->tk_garb_retry--; 2813 trace_rpc__bad_creds(task); 2814 task->tk_action = call_encode; 2815 return -EAGAIN; 2816 case rpc_autherr_tooweak: 2817 trace_rpc__auth_tooweak(task); 2818 pr_warn("RPC: server %s requires stronger authentication.\n", 2819 task->tk_xprt->servername); 2820 break; 2821 default: 2822 goto out_unparsable; 2823 } 2824 goto out_err; 2825 } 2826 2827 static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr, 2828 const void *obj) 2829 { 2830 } 2831 2832 static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr, 2833 void *obj) 2834 { 2835 return 0; 2836 } 2837 2838 static const struct rpc_procinfo rpcproc_null = { 2839 .p_encode = rpcproc_encode_null, 2840 .p_decode = rpcproc_decode_null, 2841 }; 2842 2843 static const struct rpc_procinfo rpcproc_null_noreply = { 2844 .p_encode = rpcproc_encode_null, 2845 }; 2846 2847 static void 2848 rpc_null_call_prepare(struct rpc_task *task, void *data) 2849 { 2850 task->tk_flags &= ~RPC_TASK_NO_RETRANS_TIMEOUT; 2851 rpc_call_start(task); 2852 } 2853 2854 static const struct rpc_call_ops rpc_null_ops = { 2855 .rpc_call_prepare = rpc_null_call_prepare, 2856 .rpc_call_done = rpc_default_callback, 2857 }; 2858 2859 static 2860 struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt, 2861 struct rpc_xprt *xprt, struct rpc_cred *cred, int flags, 2862 const struct rpc_call_ops *ops, void *data) 2863 { 2864 struct rpc_message msg = { 2865 .rpc_proc = &rpcproc_null, 2866 }; 2867 struct rpc_task_setup task_setup_data = { 2868 .rpc_client = clnt, 2869 .rpc_xprt = xprt, 2870 .rpc_message = &msg, 2871 .rpc_op_cred = cred, 2872 .callback_ops = ops ?: &rpc_null_ops, 2873 .callback_data = data, 2874 .flags = flags | RPC_TASK_SOFT | RPC_TASK_SOFTCONN | 2875 RPC_TASK_NULLCREDS, 2876 }; 2877 2878 return rpc_run_task(&task_setup_data); 2879 } 2880 2881 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) 2882 { 2883 return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL); 2884 } 2885 EXPORT_SYMBOL_GPL(rpc_call_null); 2886 2887 static int rpc_ping(struct rpc_clnt *clnt) 2888 { 2889 struct rpc_task *task; 2890 int status; 2891 2892 if (clnt->cl_auth->au_ops->ping) 2893 return clnt->cl_auth->au_ops->ping(clnt); 2894 2895 task = rpc_call_null_helper(clnt, NULL, NULL, 0, NULL, NULL); 2896 if (IS_ERR(task)) 2897 return PTR_ERR(task); 2898 status = task->tk_status; 2899 rpc_put_task(task); 2900 return status; 2901 } 2902 2903 static int rpc_ping_noreply(struct rpc_clnt *clnt) 2904 { 2905 struct rpc_message msg = { 2906 .rpc_proc = &rpcproc_null_noreply, 2907 }; 2908 struct rpc_task_setup task_setup_data = { 2909 .rpc_client = clnt, 2910 .rpc_message = &msg, 2911 .callback_ops = &rpc_null_ops, 2912 .flags = RPC_TASK_SOFT | RPC_TASK_SOFTCONN | RPC_TASK_NULLCREDS, 2913 }; 2914 struct rpc_task *task; 2915 int status; 2916 2917 task = rpc_run_task(&task_setup_data); 2918 if (IS_ERR(task)) 2919 return PTR_ERR(task); 2920 status = task->tk_status; 2921 rpc_put_task(task); 2922 return status; 2923 } 2924 2925 struct rpc_cb_add_xprt_calldata { 2926 struct rpc_xprt_switch *xps; 2927 struct rpc_xprt *xprt; 2928 }; 2929 2930 static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata) 2931 { 2932 struct rpc_cb_add_xprt_calldata *data = calldata; 2933 2934 if (task->tk_status == 0) 2935 rpc_xprt_switch_add_xprt(data->xps, data->xprt); 2936 } 2937 2938 static void rpc_cb_add_xprt_release(void *calldata) 2939 { 2940 struct rpc_cb_add_xprt_calldata *data = calldata; 2941 2942 xprt_put(data->xprt); 2943 xprt_switch_put(data->xps); 2944 kfree(data); 2945 } 2946 2947 static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = { 2948 .rpc_call_prepare = rpc_null_call_prepare, 2949 .rpc_call_done = rpc_cb_add_xprt_done, 2950 .rpc_release = rpc_cb_add_xprt_release, 2951 }; 2952 2953 /** 2954 * rpc_clnt_test_and_add_xprt - Test and add a new transport to a rpc_clnt 2955 * @clnt: pointer to struct rpc_clnt 2956 * @xps: pointer to struct rpc_xprt_switch, 2957 * @xprt: pointer struct rpc_xprt 2958 * @in_max_connect: pointer to the max_connect value for the passed in xprt transport 2959 */ 2960 int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt, 2961 struct rpc_xprt_switch *xps, struct rpc_xprt *xprt, 2962 void *in_max_connect) 2963 { 2964 struct rpc_cb_add_xprt_calldata *data; 2965 struct rpc_task *task; 2966 int max_connect = clnt->cl_max_connect; 2967 2968 if (in_max_connect) 2969 max_connect = *(int *)in_max_connect; 2970 if (xps->xps_nunique_destaddr_xprts + 1 > max_connect) { 2971 rcu_read_lock(); 2972 pr_warn("SUNRPC: reached max allowed number (%d) did not add " 2973 "transport to server: %s\n", max_connect, 2974 rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); 2975 rcu_read_unlock(); 2976 return -EINVAL; 2977 } 2978 2979 data = kmalloc(sizeof(*data), GFP_KERNEL); 2980 if (!data) 2981 return -ENOMEM; 2982 data->xps = xprt_switch_get(xps); 2983 data->xprt = xprt_get(xprt); 2984 if (rpc_xprt_switch_has_addr(data->xps, (struct sockaddr *)&xprt->addr)) { 2985 rpc_cb_add_xprt_release(data); 2986 goto success; 2987 } 2988 2989 task = rpc_call_null_helper(clnt, xprt, NULL, RPC_TASK_ASYNC, 2990 &rpc_cb_add_xprt_call_ops, data); 2991 if (IS_ERR(task)) 2992 return PTR_ERR(task); 2993 2994 data->xps->xps_nunique_destaddr_xprts++; 2995 rpc_put_task(task); 2996 success: 2997 return 1; 2998 } 2999 EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt); 3000 3001 static int rpc_clnt_add_xprt_helper(struct rpc_clnt *clnt, 3002 struct rpc_xprt *xprt, 3003 struct rpc_add_xprt_test *data) 3004 { 3005 struct rpc_task *task; 3006 int status = -EADDRINUSE; 3007 3008 /* Test the connection */ 3009 task = rpc_call_null_helper(clnt, xprt, NULL, 0, NULL, NULL); 3010 if (IS_ERR(task)) 3011 return PTR_ERR(task); 3012 3013 status = task->tk_status; 3014 rpc_put_task(task); 3015 3016 if (status < 0) 3017 return status; 3018 3019 /* rpc_xprt_switch and rpc_xprt are deferrenced by add_xprt_test() */ 3020 data->add_xprt_test(clnt, xprt, data->data); 3021 3022 return 0; 3023 } 3024 3025 /** 3026 * rpc_clnt_setup_test_and_add_xprt() 3027 * 3028 * This is an rpc_clnt_add_xprt setup() function which returns 1 so: 3029 * 1) caller of the test function must dereference the rpc_xprt_switch 3030 * and the rpc_xprt. 3031 * 2) test function must call rpc_xprt_switch_add_xprt, usually in 3032 * the rpc_call_done routine. 3033 * 3034 * Upon success (return of 1), the test function adds the new 3035 * transport to the rpc_clnt xprt switch 3036 * 3037 * @clnt: struct rpc_clnt to get the new transport 3038 * @xps: the rpc_xprt_switch to hold the new transport 3039 * @xprt: the rpc_xprt to test 3040 * @data: a struct rpc_add_xprt_test pointer that holds the test function 3041 * and test function call data 3042 */ 3043 int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt, 3044 struct rpc_xprt_switch *xps, 3045 struct rpc_xprt *xprt, 3046 void *data) 3047 { 3048 int status = -EADDRINUSE; 3049 3050 xprt = xprt_get(xprt); 3051 xprt_switch_get(xps); 3052 3053 if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr)) 3054 goto out_err; 3055 3056 status = rpc_clnt_add_xprt_helper(clnt, xprt, data); 3057 if (status < 0) 3058 goto out_err; 3059 3060 status = 1; 3061 out_err: 3062 xprt_put(xprt); 3063 xprt_switch_put(xps); 3064 if (status < 0) 3065 pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not " 3066 "added\n", status, 3067 xprt->address_strings[RPC_DISPLAY_ADDR]); 3068 /* so that rpc_clnt_add_xprt does not call rpc_xprt_switch_add_xprt */ 3069 return status; 3070 } 3071 EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt); 3072 3073 /** 3074 * rpc_clnt_add_xprt - Add a new transport to a rpc_clnt 3075 * @clnt: pointer to struct rpc_clnt 3076 * @xprtargs: pointer to struct xprt_create 3077 * @setup: callback to test and/or set up the connection 3078 * @data: pointer to setup function data 3079 * 3080 * Creates a new transport using the parameters set in args and 3081 * adds it to clnt. 3082 * If ping is set, then test that connectivity succeeds before 3083 * adding the new transport. 3084 * 3085 */ 3086 int rpc_clnt_add_xprt(struct rpc_clnt *clnt, 3087 struct xprt_create *xprtargs, 3088 int (*setup)(struct rpc_clnt *, 3089 struct rpc_xprt_switch *, 3090 struct rpc_xprt *, 3091 void *), 3092 void *data) 3093 { 3094 struct rpc_xprt_switch *xps; 3095 struct rpc_xprt *xprt; 3096 unsigned long connect_timeout; 3097 unsigned long reconnect_timeout; 3098 unsigned char resvport, reuseport; 3099 int ret = 0, ident; 3100 3101 rcu_read_lock(); 3102 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); 3103 xprt = xprt_iter_xprt(&clnt->cl_xpi); 3104 if (xps == NULL || xprt == NULL) { 3105 rcu_read_unlock(); 3106 xprt_switch_put(xps); 3107 return -EAGAIN; 3108 } 3109 resvport = xprt->resvport; 3110 reuseport = xprt->reuseport; 3111 connect_timeout = xprt->connect_timeout; 3112 reconnect_timeout = xprt->max_reconnect_timeout; 3113 ident = xprt->xprt_class->ident; 3114 rcu_read_unlock(); 3115 3116 if (!xprtargs->ident) 3117 xprtargs->ident = ident; 3118 xprtargs->xprtsec = clnt->cl_xprtsec; 3119 xprt = xprt_create_transport(xprtargs); 3120 if (IS_ERR(xprt)) { 3121 ret = PTR_ERR(xprt); 3122 goto out_put_switch; 3123 } 3124 xprt->resvport = resvport; 3125 xprt->reuseport = reuseport; 3126 3127 if (xprtargs->connect_timeout) 3128 connect_timeout = xprtargs->connect_timeout; 3129 if (xprtargs->reconnect_timeout) 3130 reconnect_timeout = xprtargs->reconnect_timeout; 3131 if (xprt->ops->set_connect_timeout != NULL) 3132 xprt->ops->set_connect_timeout(xprt, 3133 connect_timeout, 3134 reconnect_timeout); 3135 3136 rpc_xprt_switch_set_roundrobin(xps); 3137 if (setup) { 3138 ret = setup(clnt, xps, xprt, data); 3139 if (ret != 0) 3140 goto out_put_xprt; 3141 } 3142 rpc_xprt_switch_add_xprt(xps, xprt); 3143 out_put_xprt: 3144 xprt_put(xprt); 3145 out_put_switch: 3146 xprt_switch_put(xps); 3147 return ret; 3148 } 3149 EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt); 3150 3151 static int rpc_xprt_probe_trunked(struct rpc_clnt *clnt, 3152 struct rpc_xprt *xprt, 3153 struct rpc_add_xprt_test *data) 3154 { 3155 struct rpc_xprt *main_xprt; 3156 int status = 0; 3157 3158 xprt_get(xprt); 3159 3160 rcu_read_lock(); 3161 main_xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); 3162 status = rpc_cmp_addr_port((struct sockaddr *)&xprt->addr, 3163 (struct sockaddr *)&main_xprt->addr); 3164 rcu_read_unlock(); 3165 xprt_put(main_xprt); 3166 if (status || !test_bit(XPRT_OFFLINE, &xprt->state)) 3167 goto out; 3168 3169 status = rpc_clnt_add_xprt_helper(clnt, xprt, data); 3170 out: 3171 xprt_put(xprt); 3172 return status; 3173 } 3174 3175 /* rpc_clnt_probe_trunked_xprt -- probe offlined transport for session trunking 3176 * @clnt rpc_clnt structure 3177 * 3178 * For each offlined transport found in the rpc_clnt structure call 3179 * the function rpc_xprt_probe_trunked() which will determine if this 3180 * transport still belongs to the trunking group. 3181 */ 3182 void rpc_clnt_probe_trunked_xprts(struct rpc_clnt *clnt, 3183 struct rpc_add_xprt_test *data) 3184 { 3185 struct rpc_xprt_iter xpi; 3186 int ret; 3187 3188 ret = rpc_clnt_xprt_iter_offline_init(clnt, &xpi); 3189 if (ret) 3190 return; 3191 for (;;) { 3192 struct rpc_xprt *xprt = xprt_iter_get_next(&xpi); 3193 3194 if (!xprt) 3195 break; 3196 ret = rpc_xprt_probe_trunked(clnt, xprt, data); 3197 xprt_put(xprt); 3198 if (ret < 0) 3199 break; 3200 xprt_iter_rewind(&xpi); 3201 } 3202 xprt_iter_destroy(&xpi); 3203 } 3204 EXPORT_SYMBOL_GPL(rpc_clnt_probe_trunked_xprts); 3205 3206 static int rpc_xprt_offline(struct rpc_clnt *clnt, 3207 struct rpc_xprt *xprt, 3208 void *data) 3209 { 3210 struct rpc_xprt *main_xprt; 3211 struct rpc_xprt_switch *xps; 3212 int err = 0; 3213 3214 xprt_get(xprt); 3215 3216 rcu_read_lock(); 3217 main_xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); 3218 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); 3219 err = rpc_cmp_addr_port((struct sockaddr *)&xprt->addr, 3220 (struct sockaddr *)&main_xprt->addr); 3221 rcu_read_unlock(); 3222 xprt_put(main_xprt); 3223 if (err) 3224 goto out; 3225 3226 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) { 3227 err = -EINTR; 3228 goto out; 3229 } 3230 xprt_set_offline_locked(xprt, xps); 3231 3232 xprt_release_write(xprt, NULL); 3233 out: 3234 xprt_put(xprt); 3235 xprt_switch_put(xps); 3236 return err; 3237 } 3238 3239 /* rpc_clnt_manage_trunked_xprts -- offline trunked transports 3240 * @clnt rpc_clnt structure 3241 * 3242 * For each active transport found in the rpc_clnt structure call 3243 * the function rpc_xprt_offline() which will identify trunked transports 3244 * and will mark them offline. 3245 */ 3246 void rpc_clnt_manage_trunked_xprts(struct rpc_clnt *clnt) 3247 { 3248 rpc_clnt_iterate_for_each_xprt(clnt, rpc_xprt_offline, NULL); 3249 } 3250 EXPORT_SYMBOL_GPL(rpc_clnt_manage_trunked_xprts); 3251 3252 struct connect_timeout_data { 3253 unsigned long connect_timeout; 3254 unsigned long reconnect_timeout; 3255 }; 3256 3257 static int 3258 rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt, 3259 struct rpc_xprt *xprt, 3260 void *data) 3261 { 3262 struct connect_timeout_data *timeo = data; 3263 3264 if (xprt->ops->set_connect_timeout) 3265 xprt->ops->set_connect_timeout(xprt, 3266 timeo->connect_timeout, 3267 timeo->reconnect_timeout); 3268 return 0; 3269 } 3270 3271 void 3272 rpc_set_connect_timeout(struct rpc_clnt *clnt, 3273 unsigned long connect_timeout, 3274 unsigned long reconnect_timeout) 3275 { 3276 struct connect_timeout_data timeout = { 3277 .connect_timeout = connect_timeout, 3278 .reconnect_timeout = reconnect_timeout, 3279 }; 3280 rpc_clnt_iterate_for_each_xprt(clnt, 3281 rpc_xprt_set_connect_timeout, 3282 &timeout); 3283 } 3284 EXPORT_SYMBOL_GPL(rpc_set_connect_timeout); 3285 3286 void rpc_clnt_xprt_set_online(struct rpc_clnt *clnt, struct rpc_xprt *xprt) 3287 { 3288 struct rpc_xprt_switch *xps; 3289 3290 xps = rpc_clnt_xprt_switch_get(clnt); 3291 xprt_set_online_locked(xprt, xps); 3292 xprt_switch_put(xps); 3293 } 3294 3295 void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) 3296 { 3297 struct rpc_xprt_switch *xps; 3298 3299 if (rpc_clnt_xprt_switch_has_addr(clnt, 3300 (const struct sockaddr *)&xprt->addr)) { 3301 return rpc_clnt_xprt_set_online(clnt, xprt); 3302 } 3303 3304 xps = rpc_clnt_xprt_switch_get(clnt); 3305 rpc_xprt_switch_add_xprt(xps, xprt); 3306 xprt_switch_put(xps); 3307 } 3308 EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt); 3309 3310 void rpc_clnt_xprt_switch_remove_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) 3311 { 3312 struct rpc_xprt_switch *xps; 3313 3314 rcu_read_lock(); 3315 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); 3316 rpc_xprt_switch_remove_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch), 3317 xprt, 0); 3318 xps->xps_nunique_destaddr_xprts--; 3319 rcu_read_unlock(); 3320 } 3321 EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_remove_xprt); 3322 3323 bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt, 3324 const struct sockaddr *sap) 3325 { 3326 struct rpc_xprt_switch *xps; 3327 bool ret; 3328 3329 rcu_read_lock(); 3330 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); 3331 ret = rpc_xprt_switch_has_addr(xps, sap); 3332 rcu_read_unlock(); 3333 return ret; 3334 } 3335 EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr); 3336 3337 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3338 static void rpc_show_header(struct rpc_clnt *clnt) 3339 { 3340 printk(KERN_INFO "clnt[%pISpc] RPC tasks[%d]\n", 3341 (struct sockaddr *)&clnt->cl_xprt->addr, 3342 atomic_read(&clnt->cl_task_count)); 3343 printk(KERN_INFO "-pid- flgs status -client- --rqstp- " 3344 "-timeout ---ops--\n"); 3345 } 3346 3347 static void rpc_show_task(const struct rpc_clnt *clnt, 3348 const struct rpc_task *task) 3349 { 3350 const char *rpc_waitq = "none"; 3351 3352 if (RPC_IS_QUEUED(task)) 3353 rpc_waitq = rpc_qname(task->tk_waitqueue); 3354 3355 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", 3356 task->tk_pid, task->tk_flags, task->tk_status, 3357 clnt, task->tk_rqstp, rpc_task_timeout(task), task->tk_ops, 3358 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), 3359 task->tk_action, rpc_waitq); 3360 } 3361 3362 void rpc_show_tasks(struct net *net) 3363 { 3364 struct rpc_clnt *clnt; 3365 struct rpc_task *task; 3366 int header = 0; 3367 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 3368 3369 spin_lock(&sn->rpc_client_lock); 3370 list_for_each_entry(clnt, &sn->all_clients, cl_clients) { 3371 spin_lock(&clnt->cl_lock); 3372 list_for_each_entry(task, &clnt->cl_tasks, tk_task) { 3373 if (!header) { 3374 rpc_show_header(clnt); 3375 header++; 3376 } 3377 rpc_show_task(clnt, task); 3378 } 3379 spin_unlock(&clnt->cl_lock); 3380 } 3381 spin_unlock(&sn->rpc_client_lock); 3382 } 3383 #endif 3384 3385 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 3386 static int 3387 rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt, 3388 struct rpc_xprt *xprt, 3389 void *dummy) 3390 { 3391 return xprt_enable_swap(xprt); 3392 } 3393 3394 int 3395 rpc_clnt_swap_activate(struct rpc_clnt *clnt) 3396 { 3397 while (clnt != clnt->cl_parent) 3398 clnt = clnt->cl_parent; 3399 if (atomic_inc_return(&clnt->cl_swapper) == 1) 3400 return rpc_clnt_iterate_for_each_xprt(clnt, 3401 rpc_clnt_swap_activate_callback, NULL); 3402 return 0; 3403 } 3404 EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate); 3405 3406 static int 3407 rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt, 3408 struct rpc_xprt *xprt, 3409 void *dummy) 3410 { 3411 xprt_disable_swap(xprt); 3412 return 0; 3413 } 3414 3415 void 3416 rpc_clnt_swap_deactivate(struct rpc_clnt *clnt) 3417 { 3418 while (clnt != clnt->cl_parent) 3419 clnt = clnt->cl_parent; 3420 if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) 3421 rpc_clnt_iterate_for_each_xprt(clnt, 3422 rpc_clnt_swap_deactivate_callback, NULL); 3423 } 3424 EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate); 3425 #endif /* CONFIG_SUNRPC_SWAP */ 3426