1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/addr.h> 24 #include <linux/sunrpc/clnt.h> 25 #include <linux/sunrpc/stats.h> 26 #include <linux/sunrpc/metrics.h> 27 #include <linux/sunrpc/xprtsock.h> 28 #include <linux/sunrpc/xprtrdma.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/seq_file.h> 34 #include <linux/mount.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <linux/slab.h> 39 #include <linux/idr.h> 40 #include <net/ipv6.h> 41 #include <linux/nfs_xdr.h> 42 #include <linux/sunrpc/bc_xprt.h> 43 #include <linux/nsproxy.h> 44 #include <linux/pid_namespace.h> 45 46 47 #include "nfs4_fs.h" 48 #include "callback.h" 49 #include "delegation.h" 50 #include "iostat.h" 51 #include "internal.h" 52 #include "fscache.h" 53 #include "pnfs.h" 54 #include "nfs.h" 55 #include "netns.h" 56 57 #define NFSDBG_FACILITY NFSDBG_CLIENT 58 59 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 60 static DEFINE_SPINLOCK(nfs_version_lock); 61 static DEFINE_MUTEX(nfs_version_mutex); 62 static LIST_HEAD(nfs_versions); 63 64 /* 65 * RPC cruft for NFS 66 */ 67 static const struct rpc_version *nfs_version[5] = { 68 [2] = NULL, 69 [3] = NULL, 70 [4] = NULL, 71 }; 72 73 const struct rpc_program nfs_program = { 74 .name = "nfs", 75 .number = NFS_PROGRAM, 76 .nrvers = ARRAY_SIZE(nfs_version), 77 .version = nfs_version, 78 .stats = &nfs_rpcstat, 79 .pipe_dir_name = NFS_PIPE_DIRNAME, 80 }; 81 82 struct rpc_stat nfs_rpcstat = { 83 .program = &nfs_program 84 }; 85 86 static struct nfs_subversion *find_nfs_version(unsigned int version) 87 { 88 struct nfs_subversion *nfs; 89 spin_lock(&nfs_version_lock); 90 91 list_for_each_entry(nfs, &nfs_versions, list) { 92 if (nfs->rpc_ops->version == version) { 93 spin_unlock(&nfs_version_lock); 94 return nfs; 95 } 96 } 97 98 spin_unlock(&nfs_version_lock); 99 return ERR_PTR(-EPROTONOSUPPORT); 100 } 101 102 struct nfs_subversion *get_nfs_version(unsigned int version) 103 { 104 struct nfs_subversion *nfs = find_nfs_version(version); 105 106 if (IS_ERR(nfs)) { 107 mutex_lock(&nfs_version_mutex); 108 request_module("nfsv%d", version); 109 nfs = find_nfs_version(version); 110 mutex_unlock(&nfs_version_mutex); 111 } 112 113 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 114 return ERR_PTR(-EAGAIN); 115 return nfs; 116 } 117 118 void put_nfs_version(struct nfs_subversion *nfs) 119 { 120 module_put(nfs->owner); 121 } 122 123 void register_nfs_version(struct nfs_subversion *nfs) 124 { 125 spin_lock(&nfs_version_lock); 126 127 list_add(&nfs->list, &nfs_versions); 128 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 129 130 spin_unlock(&nfs_version_lock); 131 } 132 EXPORT_SYMBOL_GPL(register_nfs_version); 133 134 void unregister_nfs_version(struct nfs_subversion *nfs) 135 { 136 spin_lock(&nfs_version_lock); 137 138 nfs_version[nfs->rpc_ops->version] = NULL; 139 list_del(&nfs->list); 140 141 spin_unlock(&nfs_version_lock); 142 } 143 EXPORT_SYMBOL_GPL(unregister_nfs_version); 144 145 /* 146 * Allocate a shared client record 147 * 148 * Since these are allocated/deallocated very rarely, we don't 149 * bother putting them in a slab cache... 150 */ 151 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 152 { 153 struct nfs_client *clp; 154 int err = -ENOMEM; 155 156 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 157 goto error_0; 158 159 clp->cl_nfs_mod = cl_init->nfs_mod; 160 if (!try_module_get(clp->cl_nfs_mod->owner)) 161 goto error_dealloc; 162 163 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 164 165 refcount_set(&clp->cl_count, 1); 166 clp->cl_cons_state = NFS_CS_INITING; 167 168 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 169 clp->cl_addrlen = cl_init->addrlen; 170 171 if (cl_init->hostname) { 172 err = -ENOMEM; 173 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 174 if (!clp->cl_hostname) 175 goto error_cleanup; 176 } 177 178 INIT_LIST_HEAD(&clp->cl_superblocks); 179 clp->cl_rpcclient = ERR_PTR(-EINVAL); 180 181 clp->cl_proto = cl_init->proto; 182 clp->cl_net = get_net(cl_init->net); 183 184 clp->cl_principal = "*"; 185 nfs_fscache_get_client_cookie(clp); 186 187 return clp; 188 189 error_cleanup: 190 put_nfs_version(clp->cl_nfs_mod); 191 error_dealloc: 192 kfree(clp); 193 error_0: 194 return ERR_PTR(err); 195 } 196 EXPORT_SYMBOL_GPL(nfs_alloc_client); 197 198 #if IS_ENABLED(CONFIG_NFS_V4) 199 void nfs_cleanup_cb_ident_idr(struct net *net) 200 { 201 struct nfs_net *nn = net_generic(net, nfs_net_id); 202 203 idr_destroy(&nn->cb_ident_idr); 204 } 205 206 /* nfs_client_lock held */ 207 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 208 { 209 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 210 211 if (clp->cl_cb_ident) 212 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 213 } 214 215 static void pnfs_init_server(struct nfs_server *server) 216 { 217 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 218 } 219 220 #else 221 void nfs_cleanup_cb_ident_idr(struct net *net) 222 { 223 } 224 225 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 226 { 227 } 228 229 static void pnfs_init_server(struct nfs_server *server) 230 { 231 } 232 233 #endif /* CONFIG_NFS_V4 */ 234 235 /* 236 * Destroy a shared client record 237 */ 238 void nfs_free_client(struct nfs_client *clp) 239 { 240 nfs_fscache_release_client_cookie(clp); 241 242 /* -EIO all pending I/O */ 243 if (!IS_ERR(clp->cl_rpcclient)) 244 rpc_shutdown_client(clp->cl_rpcclient); 245 246 put_net(clp->cl_net); 247 put_nfs_version(clp->cl_nfs_mod); 248 kfree(clp->cl_hostname); 249 kfree(clp->cl_acceptor); 250 kfree(clp); 251 } 252 EXPORT_SYMBOL_GPL(nfs_free_client); 253 254 /* 255 * Release a reference to a shared client record 256 */ 257 void nfs_put_client(struct nfs_client *clp) 258 { 259 struct nfs_net *nn; 260 261 if (!clp) 262 return; 263 264 nn = net_generic(clp->cl_net, nfs_net_id); 265 266 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 267 list_del(&clp->cl_share_link); 268 nfs_cb_idr_remove_locked(clp); 269 spin_unlock(&nn->nfs_client_lock); 270 271 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 272 273 clp->rpc_ops->free_client(clp); 274 } 275 } 276 EXPORT_SYMBOL_GPL(nfs_put_client); 277 278 /* 279 * Find an nfs_client on the list that matches the initialisation data 280 * that is supplied. 281 */ 282 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 283 { 284 struct nfs_client *clp; 285 const struct sockaddr *sap = data->addr; 286 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 287 288 again: 289 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 290 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 291 /* Don't match clients that failed to initialise properly */ 292 if (clp->cl_cons_state < 0) 293 continue; 294 295 /* If a client is still initializing then we need to wait */ 296 if (clp->cl_cons_state > NFS_CS_READY) { 297 refcount_inc(&clp->cl_count); 298 spin_unlock(&nn->nfs_client_lock); 299 nfs_wait_client_init_complete(clp); 300 nfs_put_client(clp); 301 spin_lock(&nn->nfs_client_lock); 302 goto again; 303 } 304 305 /* Different NFS versions cannot share the same nfs_client */ 306 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 307 continue; 308 309 if (clp->cl_proto != data->proto) 310 continue; 311 /* Match nfsv4 minorversion */ 312 if (clp->cl_minorversion != data->minorversion) 313 continue; 314 /* Match the full socket address */ 315 if (!rpc_cmp_addr_port(sap, clap)) 316 /* Match all xprt_switch full socket addresses */ 317 if (IS_ERR(clp->cl_rpcclient) || 318 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 319 sap)) 320 continue; 321 322 refcount_inc(&clp->cl_count); 323 return clp; 324 } 325 return NULL; 326 } 327 328 /* 329 * Return true if @clp is done initializing, false if still working on it. 330 * 331 * Use nfs_client_init_status to check if it was successful. 332 */ 333 bool nfs_client_init_is_complete(const struct nfs_client *clp) 334 { 335 return clp->cl_cons_state <= NFS_CS_READY; 336 } 337 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 338 339 /* 340 * Return 0 if @clp was successfully initialized, -errno otherwise. 341 * 342 * This must be called *after* nfs_client_init_is_complete() returns true, 343 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 344 */ 345 int nfs_client_init_status(const struct nfs_client *clp) 346 { 347 /* called without checking nfs_client_init_is_complete */ 348 if (clp->cl_cons_state > NFS_CS_READY) { 349 WARN_ON_ONCE(1); 350 return -EINVAL; 351 } 352 return clp->cl_cons_state; 353 } 354 EXPORT_SYMBOL_GPL(nfs_client_init_status); 355 356 int nfs_wait_client_init_complete(const struct nfs_client *clp) 357 { 358 return wait_event_killable(nfs_client_active_wq, 359 nfs_client_init_is_complete(clp)); 360 } 361 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 362 363 /* 364 * Found an existing client. Make sure it's ready before returning. 365 */ 366 static struct nfs_client * 367 nfs_found_client(const struct nfs_client_initdata *cl_init, 368 struct nfs_client *clp) 369 { 370 int error; 371 372 error = nfs_wait_client_init_complete(clp); 373 if (error < 0) { 374 nfs_put_client(clp); 375 return ERR_PTR(-ERESTARTSYS); 376 } 377 378 if (clp->cl_cons_state < NFS_CS_READY) { 379 error = clp->cl_cons_state; 380 nfs_put_client(clp); 381 return ERR_PTR(error); 382 } 383 384 smp_rmb(); 385 return clp; 386 } 387 388 /* 389 * Look up a client by IP address and protocol version 390 * - creates a new record if one doesn't yet exist 391 */ 392 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 393 { 394 struct nfs_client *clp, *new = NULL; 395 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 396 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 397 398 if (cl_init->hostname == NULL) { 399 WARN_ON(1); 400 return NULL; 401 } 402 403 /* see if the client already exists */ 404 do { 405 spin_lock(&nn->nfs_client_lock); 406 407 clp = nfs_match_client(cl_init); 408 if (clp) { 409 spin_unlock(&nn->nfs_client_lock); 410 if (new) 411 new->rpc_ops->free_client(new); 412 return nfs_found_client(cl_init, clp); 413 } 414 if (new) { 415 list_add_tail(&new->cl_share_link, 416 &nn->nfs_client_list); 417 spin_unlock(&nn->nfs_client_lock); 418 new->cl_flags = cl_init->init_flags; 419 return rpc_ops->init_client(new, cl_init); 420 } 421 422 spin_unlock(&nn->nfs_client_lock); 423 424 new = rpc_ops->alloc_client(cl_init); 425 } while (!IS_ERR(new)); 426 427 return new; 428 } 429 EXPORT_SYMBOL_GPL(nfs_get_client); 430 431 /* 432 * Mark a server as ready or failed 433 */ 434 void nfs_mark_client_ready(struct nfs_client *clp, int state) 435 { 436 smp_wmb(); 437 clp->cl_cons_state = state; 438 wake_up_all(&nfs_client_active_wq); 439 } 440 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 441 442 /* 443 * Initialise the timeout values for a connection 444 */ 445 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 446 int timeo, int retrans) 447 { 448 to->to_initval = timeo * HZ / 10; 449 to->to_retries = retrans; 450 451 switch (proto) { 452 case XPRT_TRANSPORT_TCP: 453 case XPRT_TRANSPORT_RDMA: 454 if (retrans == NFS_UNSPEC_RETRANS) 455 to->to_retries = NFS_DEF_TCP_RETRANS; 456 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 457 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 458 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 459 to->to_initval = NFS_MAX_TCP_TIMEOUT; 460 to->to_increment = to->to_initval; 461 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 462 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 463 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 464 if (to->to_maxval < to->to_initval) 465 to->to_maxval = to->to_initval; 466 to->to_exponential = 0; 467 break; 468 case XPRT_TRANSPORT_UDP: 469 if (retrans == NFS_UNSPEC_RETRANS) 470 to->to_retries = NFS_DEF_UDP_RETRANS; 471 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 472 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 473 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 474 to->to_initval = NFS_MAX_UDP_TIMEOUT; 475 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 476 to->to_exponential = 1; 477 break; 478 default: 479 BUG(); 480 } 481 } 482 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 483 484 /* 485 * Create an RPC client handle 486 */ 487 int nfs_create_rpc_client(struct nfs_client *clp, 488 const struct nfs_client_initdata *cl_init, 489 rpc_authflavor_t flavor) 490 { 491 struct rpc_clnt *clnt = NULL; 492 struct rpc_create_args args = { 493 .net = clp->cl_net, 494 .protocol = clp->cl_proto, 495 .address = (struct sockaddr *)&clp->cl_addr, 496 .addrsize = clp->cl_addrlen, 497 .timeout = cl_init->timeparms, 498 .servername = clp->cl_hostname, 499 .nodename = cl_init->nodename, 500 .program = &nfs_program, 501 .version = clp->rpc_ops->version, 502 .authflavor = flavor, 503 }; 504 505 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 506 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 507 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 508 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 509 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 510 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 511 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 512 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 513 514 if (!IS_ERR(clp->cl_rpcclient)) 515 return 0; 516 517 clnt = rpc_create(&args); 518 if (IS_ERR(clnt)) { 519 dprintk("%s: cannot create RPC client. Error = %ld\n", 520 __func__, PTR_ERR(clnt)); 521 return PTR_ERR(clnt); 522 } 523 524 clnt->cl_principal = clp->cl_principal; 525 clp->cl_rpcclient = clnt; 526 return 0; 527 } 528 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 529 530 /* 531 * Version 2 or 3 client destruction 532 */ 533 static void nfs_destroy_server(struct nfs_server *server) 534 { 535 if (server->nlm_host) 536 nlmclnt_done(server->nlm_host); 537 } 538 539 /* 540 * Version 2 or 3 lockd setup 541 */ 542 static int nfs_start_lockd(struct nfs_server *server) 543 { 544 struct nlm_host *host; 545 struct nfs_client *clp = server->nfs_client; 546 struct nlmclnt_initdata nlm_init = { 547 .hostname = clp->cl_hostname, 548 .address = (struct sockaddr *)&clp->cl_addr, 549 .addrlen = clp->cl_addrlen, 550 .nfs_version = clp->rpc_ops->version, 551 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 552 1 : 0, 553 .net = clp->cl_net, 554 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 555 }; 556 557 if (nlm_init.nfs_version > 3) 558 return 0; 559 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 560 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 561 return 0; 562 563 switch (clp->cl_proto) { 564 default: 565 nlm_init.protocol = IPPROTO_TCP; 566 break; 567 case XPRT_TRANSPORT_UDP: 568 nlm_init.protocol = IPPROTO_UDP; 569 } 570 571 host = nlmclnt_init(&nlm_init); 572 if (IS_ERR(host)) 573 return PTR_ERR(host); 574 575 server->nlm_host = host; 576 server->destroy = nfs_destroy_server; 577 return 0; 578 } 579 580 /* 581 * Create a general RPC client 582 */ 583 int nfs_init_server_rpcclient(struct nfs_server *server, 584 const struct rpc_timeout *timeo, 585 rpc_authflavor_t pseudoflavour) 586 { 587 struct nfs_client *clp = server->nfs_client; 588 589 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 590 pseudoflavour); 591 if (IS_ERR(server->client)) { 592 dprintk("%s: couldn't create rpc_client!\n", __func__); 593 return PTR_ERR(server->client); 594 } 595 596 memcpy(&server->client->cl_timeout_default, 597 timeo, 598 sizeof(server->client->cl_timeout_default)); 599 server->client->cl_timeout = &server->client->cl_timeout_default; 600 server->client->cl_softrtry = 0; 601 if (server->flags & NFS_MOUNT_SOFT) 602 server->client->cl_softrtry = 1; 603 604 return 0; 605 } 606 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 607 608 /** 609 * nfs_init_client - Initialise an NFS2 or NFS3 client 610 * 611 * @clp: nfs_client to initialise 612 * @cl_init: Initialisation parameters 613 * 614 * Returns pointer to an NFS client, or an ERR_PTR value. 615 */ 616 struct nfs_client *nfs_init_client(struct nfs_client *clp, 617 const struct nfs_client_initdata *cl_init) 618 { 619 int error; 620 621 /* the client is already initialised */ 622 if (clp->cl_cons_state == NFS_CS_READY) 623 return clp; 624 625 /* 626 * Create a client RPC handle for doing FSSTAT with UNIX auth only 627 * - RFC 2623, sec 2.3.2 628 */ 629 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 630 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 631 if (error < 0) { 632 nfs_put_client(clp); 633 clp = ERR_PTR(error); 634 } 635 return clp; 636 } 637 EXPORT_SYMBOL_GPL(nfs_init_client); 638 639 /* 640 * Create a version 2 or 3 client 641 */ 642 static int nfs_init_server(struct nfs_server *server, 643 const struct nfs_parsed_mount_data *data, 644 struct nfs_subversion *nfs_mod) 645 { 646 struct rpc_timeout timeparms; 647 struct nfs_client_initdata cl_init = { 648 .hostname = data->nfs_server.hostname, 649 .addr = (const struct sockaddr *)&data->nfs_server.address, 650 .addrlen = data->nfs_server.addrlen, 651 .nfs_mod = nfs_mod, 652 .proto = data->nfs_server.protocol, 653 .net = data->net, 654 .timeparms = &timeparms, 655 }; 656 struct nfs_client *clp; 657 int error; 658 659 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 660 data->timeo, data->retrans); 661 if (data->flags & NFS_MOUNT_NORESVPORT) 662 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 663 664 /* Allocate or find a client reference we can use */ 665 clp = nfs_get_client(&cl_init); 666 if (IS_ERR(clp)) 667 return PTR_ERR(clp); 668 669 server->nfs_client = clp; 670 671 /* Initialise the client representation from the mount data */ 672 server->flags = data->flags; 673 server->options = data->options; 674 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 675 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 676 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 677 678 if (data->rsize) 679 server->rsize = nfs_block_size(data->rsize, NULL); 680 if (data->wsize) 681 server->wsize = nfs_block_size(data->wsize, NULL); 682 683 server->acregmin = data->acregmin * HZ; 684 server->acregmax = data->acregmax * HZ; 685 server->acdirmin = data->acdirmin * HZ; 686 server->acdirmax = data->acdirmax * HZ; 687 688 /* Start lockd here, before we might error out */ 689 error = nfs_start_lockd(server); 690 if (error < 0) 691 goto error; 692 693 server->port = data->nfs_server.port; 694 server->auth_info = data->auth_info; 695 696 error = nfs_init_server_rpcclient(server, &timeparms, 697 data->selected_flavor); 698 if (error < 0) 699 goto error; 700 701 /* Preserve the values of mount_server-related mount options */ 702 if (data->mount_server.addrlen) { 703 memcpy(&server->mountd_address, &data->mount_server.address, 704 data->mount_server.addrlen); 705 server->mountd_addrlen = data->mount_server.addrlen; 706 } 707 server->mountd_version = data->mount_server.version; 708 server->mountd_port = data->mount_server.port; 709 server->mountd_protocol = data->mount_server.protocol; 710 711 server->namelen = data->namlen; 712 return 0; 713 714 error: 715 server->nfs_client = NULL; 716 nfs_put_client(clp); 717 return error; 718 } 719 720 /* 721 * Load up the server record from information gained in an fsinfo record 722 */ 723 static void nfs_server_set_fsinfo(struct nfs_server *server, 724 struct nfs_fsinfo *fsinfo) 725 { 726 unsigned long max_rpc_payload; 727 728 /* Work out a lot of parameters */ 729 if (server->rsize == 0) 730 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 731 if (server->wsize == 0) 732 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 733 734 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 735 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 736 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 737 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 738 739 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 740 if (server->rsize > max_rpc_payload) 741 server->rsize = max_rpc_payload; 742 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 743 server->rsize = NFS_MAX_FILE_IO_SIZE; 744 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 745 746 if (server->wsize > max_rpc_payload) 747 server->wsize = max_rpc_payload; 748 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 749 server->wsize = NFS_MAX_FILE_IO_SIZE; 750 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 751 752 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 753 754 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 755 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 756 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 757 if (server->dtsize > server->rsize) 758 server->dtsize = server->rsize; 759 760 if (server->flags & NFS_MOUNT_NOAC) { 761 server->acregmin = server->acregmax = 0; 762 server->acdirmin = server->acdirmax = 0; 763 } 764 765 server->maxfilesize = fsinfo->maxfilesize; 766 767 server->time_delta = fsinfo->time_delta; 768 769 server->clone_blksize = fsinfo->clone_blksize; 770 /* We're airborne Set socket buffersize */ 771 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 772 } 773 774 /* 775 * Probe filesystem information, including the FSID on v2/v3 776 */ 777 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 778 { 779 struct nfs_fsinfo fsinfo; 780 struct nfs_client *clp = server->nfs_client; 781 int error; 782 783 if (clp->rpc_ops->set_capabilities != NULL) { 784 error = clp->rpc_ops->set_capabilities(server, mntfh); 785 if (error < 0) 786 return error; 787 } 788 789 fsinfo.fattr = fattr; 790 fsinfo.nlayouttypes = 0; 791 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 792 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 793 if (error < 0) 794 return error; 795 796 nfs_server_set_fsinfo(server, &fsinfo); 797 798 /* Get some general file system info */ 799 if (server->namelen == 0) { 800 struct nfs_pathconf pathinfo; 801 802 pathinfo.fattr = fattr; 803 nfs_fattr_init(fattr); 804 805 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 806 server->namelen = pathinfo.max_namelen; 807 } 808 809 return 0; 810 } 811 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 812 813 /* 814 * Copy useful information when duplicating a server record 815 */ 816 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 817 { 818 target->flags = source->flags; 819 target->rsize = source->rsize; 820 target->wsize = source->wsize; 821 target->acregmin = source->acregmin; 822 target->acregmax = source->acregmax; 823 target->acdirmin = source->acdirmin; 824 target->acdirmax = source->acdirmax; 825 target->caps = source->caps; 826 target->options = source->options; 827 target->auth_info = source->auth_info; 828 target->port = source->port; 829 } 830 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 831 832 void nfs_server_insert_lists(struct nfs_server *server) 833 { 834 struct nfs_client *clp = server->nfs_client; 835 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 836 837 spin_lock(&nn->nfs_client_lock); 838 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 839 list_add_tail(&server->master_link, &nn->nfs_volume_list); 840 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 841 spin_unlock(&nn->nfs_client_lock); 842 843 } 844 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 845 846 void nfs_server_remove_lists(struct nfs_server *server) 847 { 848 struct nfs_client *clp = server->nfs_client; 849 struct nfs_net *nn; 850 851 if (clp == NULL) 852 return; 853 nn = net_generic(clp->cl_net, nfs_net_id); 854 spin_lock(&nn->nfs_client_lock); 855 list_del_rcu(&server->client_link); 856 if (list_empty(&clp->cl_superblocks)) 857 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 858 list_del(&server->master_link); 859 spin_unlock(&nn->nfs_client_lock); 860 861 synchronize_rcu(); 862 } 863 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 864 865 /* 866 * Allocate and initialise a server record 867 */ 868 struct nfs_server *nfs_alloc_server(void) 869 { 870 struct nfs_server *server; 871 872 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 873 if (!server) 874 return NULL; 875 876 server->client = server->client_acl = ERR_PTR(-EINVAL); 877 878 /* Zero out the NFS state stuff */ 879 INIT_LIST_HEAD(&server->client_link); 880 INIT_LIST_HEAD(&server->master_link); 881 INIT_LIST_HEAD(&server->delegations); 882 INIT_LIST_HEAD(&server->layouts); 883 INIT_LIST_HEAD(&server->state_owners_lru); 884 INIT_LIST_HEAD(&server->ss_copies); 885 886 atomic_set(&server->active, 0); 887 888 server->io_stats = nfs_alloc_iostats(); 889 if (!server->io_stats) { 890 kfree(server); 891 return NULL; 892 } 893 894 ida_init(&server->openowner_id); 895 ida_init(&server->lockowner_id); 896 pnfs_init_server(server); 897 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 898 899 return server; 900 } 901 EXPORT_SYMBOL_GPL(nfs_alloc_server); 902 903 /* 904 * Free up a server record 905 */ 906 void nfs_free_server(struct nfs_server *server) 907 { 908 nfs_server_remove_lists(server); 909 910 if (server->destroy != NULL) 911 server->destroy(server); 912 913 if (!IS_ERR(server->client_acl)) 914 rpc_shutdown_client(server->client_acl); 915 if (!IS_ERR(server->client)) 916 rpc_shutdown_client(server->client); 917 918 nfs_put_client(server->nfs_client); 919 920 ida_destroy(&server->lockowner_id); 921 ida_destroy(&server->openowner_id); 922 nfs_free_iostats(server->io_stats); 923 kfree(server); 924 nfs_release_automount_timer(); 925 } 926 EXPORT_SYMBOL_GPL(nfs_free_server); 927 928 /* 929 * Create a version 2 or 3 volume record 930 * - keyed on server and FSID 931 */ 932 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 933 struct nfs_subversion *nfs_mod) 934 { 935 struct nfs_server *server; 936 struct nfs_fattr *fattr; 937 int error; 938 939 server = nfs_alloc_server(); 940 if (!server) 941 return ERR_PTR(-ENOMEM); 942 943 error = -ENOMEM; 944 fattr = nfs_alloc_fattr(); 945 if (fattr == NULL) 946 goto error; 947 948 /* Get a client representation */ 949 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 950 if (error < 0) 951 goto error; 952 953 /* Probe the root fh to retrieve its FSID */ 954 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 955 if (error < 0) 956 goto error; 957 if (server->nfs_client->rpc_ops->version == 3) { 958 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 959 server->namelen = NFS3_MAXNAMLEN; 960 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 961 server->caps |= NFS_CAP_READDIRPLUS; 962 } else { 963 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 964 server->namelen = NFS2_MAXNAMLEN; 965 } 966 967 if (!(fattr->valid & NFS_ATTR_FATTR)) { 968 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, 969 fattr, NULL, NULL); 970 if (error < 0) { 971 dprintk("nfs_create_server: getattr error = %d\n", -error); 972 goto error; 973 } 974 } 975 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 976 977 dprintk("Server FSID: %llx:%llx\n", 978 (unsigned long long) server->fsid.major, 979 (unsigned long long) server->fsid.minor); 980 981 nfs_server_insert_lists(server); 982 server->mount_time = jiffies; 983 nfs_free_fattr(fattr); 984 return server; 985 986 error: 987 nfs_free_fattr(fattr); 988 nfs_free_server(server); 989 return ERR_PTR(error); 990 } 991 EXPORT_SYMBOL_GPL(nfs_create_server); 992 993 /* 994 * Clone an NFS2, NFS3 or NFS4 server record 995 */ 996 struct nfs_server *nfs_clone_server(struct nfs_server *source, 997 struct nfs_fh *fh, 998 struct nfs_fattr *fattr, 999 rpc_authflavor_t flavor) 1000 { 1001 struct nfs_server *server; 1002 struct nfs_fattr *fattr_fsinfo; 1003 int error; 1004 1005 server = nfs_alloc_server(); 1006 if (!server) 1007 return ERR_PTR(-ENOMEM); 1008 1009 error = -ENOMEM; 1010 fattr_fsinfo = nfs_alloc_fattr(); 1011 if (fattr_fsinfo == NULL) 1012 goto out_free_server; 1013 1014 /* Copy data from the source */ 1015 server->nfs_client = source->nfs_client; 1016 server->destroy = source->destroy; 1017 refcount_inc(&server->nfs_client->cl_count); 1018 nfs_server_copy_userdata(server, source); 1019 1020 server->fsid = fattr->fsid; 1021 1022 error = nfs_init_server_rpcclient(server, 1023 source->client->cl_timeout, 1024 flavor); 1025 if (error < 0) 1026 goto out_free_server; 1027 1028 /* probe the filesystem info for this server filesystem */ 1029 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1030 if (error < 0) 1031 goto out_free_server; 1032 1033 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1034 server->namelen = NFS4_MAXNAMLEN; 1035 1036 error = nfs_start_lockd(server); 1037 if (error < 0) 1038 goto out_free_server; 1039 1040 nfs_server_insert_lists(server); 1041 server->mount_time = jiffies; 1042 1043 nfs_free_fattr(fattr_fsinfo); 1044 return server; 1045 1046 out_free_server: 1047 nfs_free_fattr(fattr_fsinfo); 1048 nfs_free_server(server); 1049 return ERR_PTR(error); 1050 } 1051 EXPORT_SYMBOL_GPL(nfs_clone_server); 1052 1053 void nfs_clients_init(struct net *net) 1054 { 1055 struct nfs_net *nn = net_generic(net, nfs_net_id); 1056 1057 INIT_LIST_HEAD(&nn->nfs_client_list); 1058 INIT_LIST_HEAD(&nn->nfs_volume_list); 1059 #if IS_ENABLED(CONFIG_NFS_V4) 1060 idr_init(&nn->cb_ident_idr); 1061 #endif 1062 spin_lock_init(&nn->nfs_client_lock); 1063 nn->boot_time = ktime_get_real(); 1064 } 1065 1066 #ifdef CONFIG_PROC_FS 1067 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1068 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1069 static void nfs_server_list_stop(struct seq_file *p, void *v); 1070 static int nfs_server_list_show(struct seq_file *m, void *v); 1071 1072 static const struct seq_operations nfs_server_list_ops = { 1073 .start = nfs_server_list_start, 1074 .next = nfs_server_list_next, 1075 .stop = nfs_server_list_stop, 1076 .show = nfs_server_list_show, 1077 }; 1078 1079 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1080 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1081 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1082 static int nfs_volume_list_show(struct seq_file *m, void *v); 1083 1084 static const struct seq_operations nfs_volume_list_ops = { 1085 .start = nfs_volume_list_start, 1086 .next = nfs_volume_list_next, 1087 .stop = nfs_volume_list_stop, 1088 .show = nfs_volume_list_show, 1089 }; 1090 1091 /* 1092 * set up the iterator to start reading from the server list and return the first item 1093 */ 1094 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1095 __acquires(&nn->nfs_client_lock) 1096 { 1097 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1098 1099 /* lock the list against modification */ 1100 spin_lock(&nn->nfs_client_lock); 1101 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1102 } 1103 1104 /* 1105 * move to next server 1106 */ 1107 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1108 { 1109 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1110 1111 return seq_list_next(v, &nn->nfs_client_list, pos); 1112 } 1113 1114 /* 1115 * clean up after reading from the transports list 1116 */ 1117 static void nfs_server_list_stop(struct seq_file *p, void *v) 1118 __releases(&nn->nfs_client_lock) 1119 { 1120 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1121 1122 spin_unlock(&nn->nfs_client_lock); 1123 } 1124 1125 /* 1126 * display a header line followed by a load of call lines 1127 */ 1128 static int nfs_server_list_show(struct seq_file *m, void *v) 1129 { 1130 struct nfs_client *clp; 1131 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1132 1133 /* display header on line 1 */ 1134 if (v == &nn->nfs_client_list) { 1135 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1136 return 0; 1137 } 1138 1139 /* display one transport per line on subsequent lines */ 1140 clp = list_entry(v, struct nfs_client, cl_share_link); 1141 1142 /* Check if the client is initialized */ 1143 if (clp->cl_cons_state != NFS_CS_READY) 1144 return 0; 1145 1146 rcu_read_lock(); 1147 seq_printf(m, "v%u %s %s %3d %s\n", 1148 clp->rpc_ops->version, 1149 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1150 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1151 refcount_read(&clp->cl_count), 1152 clp->cl_hostname); 1153 rcu_read_unlock(); 1154 1155 return 0; 1156 } 1157 1158 /* 1159 * set up the iterator to start reading from the volume list and return the first item 1160 */ 1161 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1162 __acquires(&nn->nfs_client_lock) 1163 { 1164 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1165 1166 /* lock the list against modification */ 1167 spin_lock(&nn->nfs_client_lock); 1168 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1169 } 1170 1171 /* 1172 * move to next volume 1173 */ 1174 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1175 { 1176 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1177 1178 return seq_list_next(v, &nn->nfs_volume_list, pos); 1179 } 1180 1181 /* 1182 * clean up after reading from the transports list 1183 */ 1184 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1185 __releases(&nn->nfs_client_lock) 1186 { 1187 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1188 1189 spin_unlock(&nn->nfs_client_lock); 1190 } 1191 1192 /* 1193 * display a header line followed by a load of call lines 1194 */ 1195 static int nfs_volume_list_show(struct seq_file *m, void *v) 1196 { 1197 struct nfs_server *server; 1198 struct nfs_client *clp; 1199 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1200 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1201 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1202 1203 /* display header on line 1 */ 1204 if (v == &nn->nfs_volume_list) { 1205 seq_puts(m, "NV SERVER PORT DEV FSID" 1206 " FSC\n"); 1207 return 0; 1208 } 1209 /* display one transport per line on subsequent lines */ 1210 server = list_entry(v, struct nfs_server, master_link); 1211 clp = server->nfs_client; 1212 1213 snprintf(dev, sizeof(dev), "%u:%u", 1214 MAJOR(server->s_dev), MINOR(server->s_dev)); 1215 1216 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1217 (unsigned long long) server->fsid.major, 1218 (unsigned long long) server->fsid.minor); 1219 1220 rcu_read_lock(); 1221 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1222 clp->rpc_ops->version, 1223 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1224 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1225 dev, 1226 fsid, 1227 nfs_server_fscache_state(server)); 1228 rcu_read_unlock(); 1229 1230 return 0; 1231 } 1232 1233 int nfs_fs_proc_net_init(struct net *net) 1234 { 1235 struct nfs_net *nn = net_generic(net, nfs_net_id); 1236 struct proc_dir_entry *p; 1237 1238 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1239 if (!nn->proc_nfsfs) 1240 goto error_0; 1241 1242 /* a file of servers with which we're dealing */ 1243 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1244 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1245 if (!p) 1246 goto error_1; 1247 1248 /* a file of volumes that we have mounted */ 1249 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1250 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1251 if (!p) 1252 goto error_1; 1253 return 0; 1254 1255 error_1: 1256 remove_proc_subtree("nfsfs", net->proc_net); 1257 error_0: 1258 return -ENOMEM; 1259 } 1260 1261 void nfs_fs_proc_net_exit(struct net *net) 1262 { 1263 remove_proc_subtree("nfsfs", net->proc_net); 1264 } 1265 1266 /* 1267 * initialise the /proc/fs/nfsfs/ directory 1268 */ 1269 int __init nfs_fs_proc_init(void) 1270 { 1271 if (!proc_mkdir("fs/nfsfs", NULL)) 1272 goto error_0; 1273 1274 /* a file of servers with which we're dealing */ 1275 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1276 goto error_1; 1277 1278 /* a file of volumes that we have mounted */ 1279 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1280 goto error_1; 1281 1282 return 0; 1283 error_1: 1284 remove_proc_subtree("fs/nfsfs", NULL); 1285 error_0: 1286 return -ENOMEM; 1287 } 1288 1289 /* 1290 * clean up the /proc/fs/nfsfs/ directory 1291 */ 1292 void nfs_fs_proc_exit(void) 1293 { 1294 remove_proc_subtree("fs/nfsfs", NULL); 1295 } 1296 1297 #endif /* CONFIG_PROC_FS */ 1298