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/clnt.h> 24 #include <linux/sunrpc/stats.h> 25 #include <linux/sunrpc/metrics.h> 26 #include <linux/sunrpc/xprtsock.h> 27 #include <linux/sunrpc/xprtrdma.h> 28 #include <linux/nfs_fs.h> 29 #include <linux/nfs_mount.h> 30 #include <linux/nfs4_mount.h> 31 #include <linux/lockd/bind.h> 32 #include <linux/seq_file.h> 33 #include <linux/mount.h> 34 #include <linux/nfs_idmap.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)) 114 try_module_get(nfs->owner); 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 struct rpc_cred *cred; 155 int err = -ENOMEM; 156 157 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 158 goto error_0; 159 160 clp->cl_nfs_mod = cl_init->nfs_mod; 161 try_module_get(clp->cl_nfs_mod->owner); 162 163 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 164 165 atomic_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 cred = rpc_lookup_machine_cred("*"); 185 if (!IS_ERR(cred)) 186 clp->cl_machine_cred = cred; 187 nfs_fscache_get_client_cookie(clp); 188 189 return clp; 190 191 error_cleanup: 192 put_nfs_version(clp->cl_nfs_mod); 193 kfree(clp); 194 error_0: 195 return ERR_PTR(err); 196 } 197 EXPORT_SYMBOL_GPL(nfs_alloc_client); 198 199 #if IS_ENABLED(CONFIG_NFS_V4) 200 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ 201 void nfs_cleanup_cb_ident_idr(struct net *net) 202 { 203 struct nfs_net *nn = net_generic(net, nfs_net_id); 204 205 idr_destroy(&nn->cb_ident_idr); 206 } 207 208 /* nfs_client_lock held */ 209 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 210 { 211 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 212 213 if (clp->cl_cb_ident) 214 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 215 } 216 217 static void pnfs_init_server(struct nfs_server *server) 218 { 219 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 220 } 221 222 #else 223 void nfs_cleanup_cb_ident_idr(struct net *net) 224 { 225 } 226 227 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 228 { 229 } 230 231 static void pnfs_init_server(struct nfs_server *server) 232 { 233 } 234 235 #endif /* CONFIG_NFS_V4 */ 236 237 /* 238 * Destroy a shared client record 239 */ 240 void nfs_free_client(struct nfs_client *clp) 241 { 242 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 243 244 nfs_fscache_release_client_cookie(clp); 245 246 /* -EIO all pending I/O */ 247 if (!IS_ERR(clp->cl_rpcclient)) 248 rpc_shutdown_client(clp->cl_rpcclient); 249 250 if (clp->cl_machine_cred != NULL) 251 put_rpccred(clp->cl_machine_cred); 252 253 put_net(clp->cl_net); 254 put_nfs_version(clp->cl_nfs_mod); 255 kfree(clp->cl_hostname); 256 kfree(clp); 257 258 dprintk("<-- nfs_free_client()\n"); 259 } 260 EXPORT_SYMBOL_GPL(nfs_free_client); 261 262 /* 263 * Release a reference to a shared client record 264 */ 265 void nfs_put_client(struct nfs_client *clp) 266 { 267 struct nfs_net *nn; 268 269 if (!clp) 270 return; 271 272 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 273 nn = net_generic(clp->cl_net, nfs_net_id); 274 275 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 276 list_del(&clp->cl_share_link); 277 nfs_cb_idr_remove_locked(clp); 278 spin_unlock(&nn->nfs_client_lock); 279 280 BUG_ON(!list_empty(&clp->cl_superblocks)); 281 282 clp->rpc_ops->free_client(clp); 283 } 284 } 285 EXPORT_SYMBOL_GPL(nfs_put_client); 286 287 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 288 /* 289 * Test if two ip6 socket addresses refer to the same socket by 290 * comparing relevant fields. The padding bytes specifically, are not 291 * compared. sin6_flowinfo is not compared because it only affects QoS 292 * and sin6_scope_id is only compared if the address is "link local" 293 * because "link local" addresses need only be unique to a specific 294 * link. Conversely, ordinary unicast addresses might have different 295 * sin6_scope_id. 296 * 297 * The caller should ensure both socket addresses are AF_INET6. 298 */ 299 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 300 const struct sockaddr *sa2) 301 { 302 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 303 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 304 305 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 306 return 0; 307 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 308 return sin1->sin6_scope_id == sin2->sin6_scope_id; 309 310 return 1; 311 } 312 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 313 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 314 const struct sockaddr *sa2) 315 { 316 return 0; 317 } 318 #endif 319 320 /* 321 * Test if two ip4 socket addresses refer to the same socket, by 322 * comparing relevant fields. The padding bytes specifically, are 323 * not compared. 324 * 325 * The caller should ensure both socket addresses are AF_INET. 326 */ 327 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 328 const struct sockaddr *sa2) 329 { 330 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 331 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 332 333 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 334 } 335 336 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 337 const struct sockaddr *sa2) 338 { 339 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 340 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 341 342 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 343 (sin1->sin6_port == sin2->sin6_port); 344 } 345 346 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 347 const struct sockaddr *sa2) 348 { 349 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 350 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 351 352 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 353 (sin1->sin_port == sin2->sin_port); 354 } 355 356 #if defined(CONFIG_NFS_V4_1) 357 /* 358 * Test if two socket addresses represent the same actual socket, 359 * by comparing (only) relevant fields, excluding the port number. 360 */ 361 int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 362 const struct sockaddr *sa2) 363 { 364 if (sa1->sa_family != sa2->sa_family) 365 return 0; 366 367 switch (sa1->sa_family) { 368 case AF_INET: 369 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 370 case AF_INET6: 371 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 372 } 373 return 0; 374 } 375 EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr); 376 #endif /* CONFIG_NFS_V4_1 */ 377 378 /* 379 * Test if two socket addresses represent the same actual socket, 380 * by comparing (only) relevant fields, including the port number. 381 */ 382 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 383 const struct sockaddr *sa2) 384 { 385 if (sa1->sa_family != sa2->sa_family) 386 return 0; 387 388 switch (sa1->sa_family) { 389 case AF_INET: 390 return nfs_sockaddr_cmp_ip4(sa1, sa2); 391 case AF_INET6: 392 return nfs_sockaddr_cmp_ip6(sa1, sa2); 393 } 394 return 0; 395 } 396 397 /* 398 * Find an nfs_client on the list that matches the initialisation data 399 * that is supplied. 400 */ 401 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 402 { 403 struct nfs_client *clp; 404 const struct sockaddr *sap = data->addr; 405 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 406 407 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 408 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 409 /* Don't match clients that failed to initialise properly */ 410 if (clp->cl_cons_state < 0) 411 continue; 412 413 /* Different NFS versions cannot share the same nfs_client */ 414 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 415 continue; 416 417 if (clp->cl_proto != data->proto) 418 continue; 419 /* Match nfsv4 minorversion */ 420 if (clp->cl_minorversion != data->minorversion) 421 continue; 422 /* Match the full socket address */ 423 if (!nfs_sockaddr_cmp(sap, clap)) 424 continue; 425 426 atomic_inc(&clp->cl_count); 427 return clp; 428 } 429 return NULL; 430 } 431 432 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 433 { 434 return clp->cl_cons_state != NFS_CS_INITING; 435 } 436 437 int nfs_wait_client_init_complete(const struct nfs_client *clp) 438 { 439 return wait_event_killable(nfs_client_active_wq, 440 nfs_client_init_is_complete(clp)); 441 } 442 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 443 444 /* 445 * Found an existing client. Make sure it's ready before returning. 446 */ 447 static struct nfs_client * 448 nfs_found_client(const struct nfs_client_initdata *cl_init, 449 struct nfs_client *clp) 450 { 451 int error; 452 453 error = nfs_wait_client_init_complete(clp); 454 if (error < 0) { 455 nfs_put_client(clp); 456 return ERR_PTR(-ERESTARTSYS); 457 } 458 459 if (clp->cl_cons_state < NFS_CS_READY) { 460 error = clp->cl_cons_state; 461 nfs_put_client(clp); 462 return ERR_PTR(error); 463 } 464 465 smp_rmb(); 466 467 dprintk("<-- %s found nfs_client %p for %s\n", 468 __func__, clp, cl_init->hostname ?: ""); 469 return clp; 470 } 471 472 /* 473 * Look up a client by IP address and protocol version 474 * - creates a new record if one doesn't yet exist 475 */ 476 struct nfs_client * 477 nfs_get_client(const struct nfs_client_initdata *cl_init, 478 const struct rpc_timeout *timeparms, 479 const char *ip_addr, 480 rpc_authflavor_t authflavour) 481 { 482 struct nfs_client *clp, *new = NULL; 483 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 484 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 485 486 dprintk("--> nfs_get_client(%s,v%u)\n", 487 cl_init->hostname ?: "", rpc_ops->version); 488 489 /* see if the client already exists */ 490 do { 491 spin_lock(&nn->nfs_client_lock); 492 493 clp = nfs_match_client(cl_init); 494 if (clp) { 495 spin_unlock(&nn->nfs_client_lock); 496 if (new) 497 new->rpc_ops->free_client(new); 498 return nfs_found_client(cl_init, clp); 499 } 500 if (new) { 501 list_add_tail(&new->cl_share_link, 502 &nn->nfs_client_list); 503 spin_unlock(&nn->nfs_client_lock); 504 new->cl_flags = cl_init->init_flags; 505 return rpc_ops->init_client(new, timeparms, ip_addr, 506 authflavour); 507 } 508 509 spin_unlock(&nn->nfs_client_lock); 510 511 new = rpc_ops->alloc_client(cl_init); 512 } while (!IS_ERR(new)); 513 514 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 515 cl_init->hostname ?: "", PTR_ERR(new)); 516 return new; 517 } 518 EXPORT_SYMBOL_GPL(nfs_get_client); 519 520 /* 521 * Mark a server as ready or failed 522 */ 523 void nfs_mark_client_ready(struct nfs_client *clp, int state) 524 { 525 smp_wmb(); 526 clp->cl_cons_state = state; 527 wake_up_all(&nfs_client_active_wq); 528 } 529 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 530 531 /* 532 * Initialise the timeout values for a connection 533 */ 534 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 535 unsigned int timeo, unsigned int retrans) 536 { 537 to->to_initval = timeo * HZ / 10; 538 to->to_retries = retrans; 539 540 switch (proto) { 541 case XPRT_TRANSPORT_TCP: 542 case XPRT_TRANSPORT_RDMA: 543 if (to->to_retries == 0) 544 to->to_retries = NFS_DEF_TCP_RETRANS; 545 if (to->to_initval == 0) 546 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 547 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 548 to->to_initval = NFS_MAX_TCP_TIMEOUT; 549 to->to_increment = to->to_initval; 550 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 551 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 552 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 553 if (to->to_maxval < to->to_initval) 554 to->to_maxval = to->to_initval; 555 to->to_exponential = 0; 556 break; 557 case XPRT_TRANSPORT_UDP: 558 if (to->to_retries == 0) 559 to->to_retries = NFS_DEF_UDP_RETRANS; 560 if (!to->to_initval) 561 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 562 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 563 to->to_initval = NFS_MAX_UDP_TIMEOUT; 564 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 565 to->to_exponential = 1; 566 break; 567 default: 568 BUG(); 569 } 570 } 571 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 572 573 /* 574 * Create an RPC client handle 575 */ 576 int nfs_create_rpc_client(struct nfs_client *clp, 577 const struct rpc_timeout *timeparms, 578 rpc_authflavor_t flavor) 579 { 580 struct rpc_clnt *clnt = NULL; 581 struct rpc_create_args args = { 582 .net = clp->cl_net, 583 .protocol = clp->cl_proto, 584 .address = (struct sockaddr *)&clp->cl_addr, 585 .addrsize = clp->cl_addrlen, 586 .timeout = timeparms, 587 .servername = clp->cl_hostname, 588 .program = &nfs_program, 589 .version = clp->rpc_ops->version, 590 .authflavor = flavor, 591 }; 592 593 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 594 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 595 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 596 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 597 598 if (!IS_ERR(clp->cl_rpcclient)) 599 return 0; 600 601 clnt = rpc_create(&args); 602 if (IS_ERR(clnt)) { 603 dprintk("%s: cannot create RPC client. Error = %ld\n", 604 __func__, PTR_ERR(clnt)); 605 return PTR_ERR(clnt); 606 } 607 608 clp->cl_rpcclient = clnt; 609 return 0; 610 } 611 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 612 613 /* 614 * Version 2 or 3 client destruction 615 */ 616 static void nfs_destroy_server(struct nfs_server *server) 617 { 618 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 619 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 620 nlmclnt_done(server->nlm_host); 621 } 622 623 /* 624 * Version 2 or 3 lockd setup 625 */ 626 static int nfs_start_lockd(struct nfs_server *server) 627 { 628 struct nlm_host *host; 629 struct nfs_client *clp = server->nfs_client; 630 struct nlmclnt_initdata nlm_init = { 631 .hostname = clp->cl_hostname, 632 .address = (struct sockaddr *)&clp->cl_addr, 633 .addrlen = clp->cl_addrlen, 634 .nfs_version = clp->rpc_ops->version, 635 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 636 1 : 0, 637 .net = clp->cl_net, 638 }; 639 640 if (nlm_init.nfs_version > 3) 641 return 0; 642 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 643 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 644 return 0; 645 646 switch (clp->cl_proto) { 647 default: 648 nlm_init.protocol = IPPROTO_TCP; 649 break; 650 case XPRT_TRANSPORT_UDP: 651 nlm_init.protocol = IPPROTO_UDP; 652 } 653 654 host = nlmclnt_init(&nlm_init); 655 if (IS_ERR(host)) 656 return PTR_ERR(host); 657 658 server->nlm_host = host; 659 server->destroy = nfs_destroy_server; 660 return 0; 661 } 662 663 /* 664 * Create a general RPC client 665 */ 666 int nfs_init_server_rpcclient(struct nfs_server *server, 667 const struct rpc_timeout *timeo, 668 rpc_authflavor_t pseudoflavour) 669 { 670 struct nfs_client *clp = server->nfs_client; 671 672 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 673 pseudoflavour); 674 if (IS_ERR(server->client)) { 675 dprintk("%s: couldn't create rpc_client!\n", __func__); 676 return PTR_ERR(server->client); 677 } 678 679 memcpy(&server->client->cl_timeout_default, 680 timeo, 681 sizeof(server->client->cl_timeout_default)); 682 server->client->cl_timeout = &server->client->cl_timeout_default; 683 server->client->cl_softrtry = 0; 684 if (server->flags & NFS_MOUNT_SOFT) 685 server->client->cl_softrtry = 1; 686 687 return 0; 688 } 689 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 690 691 /** 692 * nfs_init_client - Initialise an NFS2 or NFS3 client 693 * 694 * @clp: nfs_client to initialise 695 * @timeparms: timeout parameters for underlying RPC transport 696 * @ip_addr: IP presentation address (not used) 697 * @authflavor: authentication flavor for underlying RPC transport 698 * 699 * Returns pointer to an NFS client, or an ERR_PTR value. 700 */ 701 struct nfs_client *nfs_init_client(struct nfs_client *clp, 702 const struct rpc_timeout *timeparms, 703 const char *ip_addr, rpc_authflavor_t authflavour) 704 { 705 int error; 706 707 if (clp->cl_cons_state == NFS_CS_READY) { 708 /* the client is already initialised */ 709 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 710 return clp; 711 } 712 713 /* 714 * Create a client RPC handle for doing FSSTAT with UNIX auth only 715 * - RFC 2623, sec 2.3.2 716 */ 717 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); 718 if (error < 0) 719 goto error; 720 nfs_mark_client_ready(clp, NFS_CS_READY); 721 return clp; 722 723 error: 724 nfs_mark_client_ready(clp, error); 725 nfs_put_client(clp); 726 dprintk("<-- nfs_init_client() = xerror %d\n", error); 727 return ERR_PTR(error); 728 } 729 EXPORT_SYMBOL_GPL(nfs_init_client); 730 731 /* 732 * Create a version 2 or 3 client 733 */ 734 static int nfs_init_server(struct nfs_server *server, 735 const struct nfs_parsed_mount_data *data, 736 struct nfs_subversion *nfs_mod) 737 { 738 struct nfs_client_initdata cl_init = { 739 .hostname = data->nfs_server.hostname, 740 .addr = (const struct sockaddr *)&data->nfs_server.address, 741 .addrlen = data->nfs_server.addrlen, 742 .nfs_mod = nfs_mod, 743 .proto = data->nfs_server.protocol, 744 .net = data->net, 745 }; 746 struct rpc_timeout timeparms; 747 struct nfs_client *clp; 748 int error; 749 750 dprintk("--> nfs_init_server()\n"); 751 752 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 753 data->timeo, data->retrans); 754 if (data->flags & NFS_MOUNT_NORESVPORT) 755 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 756 if (server->options & NFS_OPTION_MIGRATION) 757 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 758 759 /* Allocate or find a client reference we can use */ 760 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX); 761 if (IS_ERR(clp)) { 762 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 763 return PTR_ERR(clp); 764 } 765 766 server->nfs_client = clp; 767 768 /* Initialise the client representation from the mount data */ 769 server->flags = data->flags; 770 server->options = data->options; 771 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 772 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 773 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR; 774 775 if (data->rsize) 776 server->rsize = nfs_block_size(data->rsize, NULL); 777 if (data->wsize) 778 server->wsize = nfs_block_size(data->wsize, NULL); 779 780 server->acregmin = data->acregmin * HZ; 781 server->acregmax = data->acregmax * HZ; 782 server->acdirmin = data->acdirmin * HZ; 783 server->acdirmax = data->acdirmax * HZ; 784 785 /* Start lockd here, before we might error out */ 786 error = nfs_start_lockd(server); 787 if (error < 0) 788 goto error; 789 790 server->port = data->nfs_server.port; 791 792 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 793 if (error < 0) 794 goto error; 795 796 /* Preserve the values of mount_server-related mount options */ 797 if (data->mount_server.addrlen) { 798 memcpy(&server->mountd_address, &data->mount_server.address, 799 data->mount_server.addrlen); 800 server->mountd_addrlen = data->mount_server.addrlen; 801 } 802 server->mountd_version = data->mount_server.version; 803 server->mountd_port = data->mount_server.port; 804 server->mountd_protocol = data->mount_server.protocol; 805 806 server->namelen = data->namlen; 807 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 808 return 0; 809 810 error: 811 server->nfs_client = NULL; 812 nfs_put_client(clp); 813 dprintk("<-- nfs_init_server() = xerror %d\n", error); 814 return error; 815 } 816 817 /* 818 * Load up the server record from information gained in an fsinfo record 819 */ 820 static void nfs_server_set_fsinfo(struct nfs_server *server, 821 struct nfs_fh *mntfh, 822 struct nfs_fsinfo *fsinfo) 823 { 824 unsigned long max_rpc_payload; 825 826 /* Work out a lot of parameters */ 827 if (server->rsize == 0) 828 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 829 if (server->wsize == 0) 830 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 831 832 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 833 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 834 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 835 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 836 837 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 838 if (server->rsize > max_rpc_payload) 839 server->rsize = max_rpc_payload; 840 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 841 server->rsize = NFS_MAX_FILE_IO_SIZE; 842 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 843 844 server->backing_dev_info.name = "nfs"; 845 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 846 847 if (server->wsize > max_rpc_payload) 848 server->wsize = max_rpc_payload; 849 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 850 server->wsize = NFS_MAX_FILE_IO_SIZE; 851 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 852 853 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 854 855 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 856 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 857 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 858 if (server->dtsize > server->rsize) 859 server->dtsize = server->rsize; 860 861 if (server->flags & NFS_MOUNT_NOAC) { 862 server->acregmin = server->acregmax = 0; 863 server->acdirmin = server->acdirmax = 0; 864 } 865 866 server->maxfilesize = fsinfo->maxfilesize; 867 868 server->time_delta = fsinfo->time_delta; 869 870 /* We're airborne Set socket buffersize */ 871 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 872 } 873 874 /* 875 * Probe filesystem information, including the FSID on v2/v3 876 */ 877 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 878 { 879 struct nfs_fsinfo fsinfo; 880 struct nfs_client *clp = server->nfs_client; 881 int error; 882 883 dprintk("--> nfs_probe_fsinfo()\n"); 884 885 if (clp->rpc_ops->set_capabilities != NULL) { 886 error = clp->rpc_ops->set_capabilities(server, mntfh); 887 if (error < 0) 888 goto out_error; 889 } 890 891 fsinfo.fattr = fattr; 892 fsinfo.layouttype = 0; 893 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 894 if (error < 0) 895 goto out_error; 896 897 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 898 899 /* Get some general file system info */ 900 if (server->namelen == 0) { 901 struct nfs_pathconf pathinfo; 902 903 pathinfo.fattr = fattr; 904 nfs_fattr_init(fattr); 905 906 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 907 server->namelen = pathinfo.max_namelen; 908 } 909 910 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 911 return 0; 912 913 out_error: 914 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 915 return error; 916 } 917 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 918 919 /* 920 * Copy useful information when duplicating a server record 921 */ 922 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 923 { 924 target->flags = source->flags; 925 target->rsize = source->rsize; 926 target->wsize = source->wsize; 927 target->acregmin = source->acregmin; 928 target->acregmax = source->acregmax; 929 target->acdirmin = source->acdirmin; 930 target->acdirmax = source->acdirmax; 931 target->caps = source->caps; 932 target->options = source->options; 933 } 934 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 935 936 void nfs_server_insert_lists(struct nfs_server *server) 937 { 938 struct nfs_client *clp = server->nfs_client; 939 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 940 941 spin_lock(&nn->nfs_client_lock); 942 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 943 list_add_tail(&server->master_link, &nn->nfs_volume_list); 944 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 945 spin_unlock(&nn->nfs_client_lock); 946 947 } 948 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 949 950 static void nfs_server_remove_lists(struct nfs_server *server) 951 { 952 struct nfs_client *clp = server->nfs_client; 953 struct nfs_net *nn; 954 955 if (clp == NULL) 956 return; 957 nn = net_generic(clp->cl_net, nfs_net_id); 958 spin_lock(&nn->nfs_client_lock); 959 list_del_rcu(&server->client_link); 960 if (list_empty(&clp->cl_superblocks)) 961 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 962 list_del(&server->master_link); 963 spin_unlock(&nn->nfs_client_lock); 964 965 synchronize_rcu(); 966 } 967 968 /* 969 * Allocate and initialise a server record 970 */ 971 struct nfs_server *nfs_alloc_server(void) 972 { 973 struct nfs_server *server; 974 975 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 976 if (!server) 977 return NULL; 978 979 server->client = server->client_acl = ERR_PTR(-EINVAL); 980 981 /* Zero out the NFS state stuff */ 982 INIT_LIST_HEAD(&server->client_link); 983 INIT_LIST_HEAD(&server->master_link); 984 INIT_LIST_HEAD(&server->delegations); 985 INIT_LIST_HEAD(&server->layouts); 986 INIT_LIST_HEAD(&server->state_owners_lru); 987 988 atomic_set(&server->active, 0); 989 990 server->io_stats = nfs_alloc_iostats(); 991 if (!server->io_stats) { 992 kfree(server); 993 return NULL; 994 } 995 996 if (bdi_init(&server->backing_dev_info)) { 997 nfs_free_iostats(server->io_stats); 998 kfree(server); 999 return NULL; 1000 } 1001 1002 ida_init(&server->openowner_id); 1003 ida_init(&server->lockowner_id); 1004 pnfs_init_server(server); 1005 1006 return server; 1007 } 1008 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1009 1010 /* 1011 * Free up a server record 1012 */ 1013 void nfs_free_server(struct nfs_server *server) 1014 { 1015 dprintk("--> nfs_free_server()\n"); 1016 1017 nfs_server_remove_lists(server); 1018 1019 if (server->destroy != NULL) 1020 server->destroy(server); 1021 1022 if (!IS_ERR(server->client_acl)) 1023 rpc_shutdown_client(server->client_acl); 1024 if (!IS_ERR(server->client)) 1025 rpc_shutdown_client(server->client); 1026 1027 nfs_put_client(server->nfs_client); 1028 1029 ida_destroy(&server->lockowner_id); 1030 ida_destroy(&server->openowner_id); 1031 nfs_free_iostats(server->io_stats); 1032 bdi_destroy(&server->backing_dev_info); 1033 kfree(server); 1034 nfs_release_automount_timer(); 1035 dprintk("<-- nfs_free_server()\n"); 1036 } 1037 EXPORT_SYMBOL_GPL(nfs_free_server); 1038 1039 /* 1040 * Create a version 2 or 3 volume record 1041 * - keyed on server and FSID 1042 */ 1043 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 1044 struct nfs_subversion *nfs_mod) 1045 { 1046 struct nfs_server *server; 1047 struct nfs_fattr *fattr; 1048 int error; 1049 1050 server = nfs_alloc_server(); 1051 if (!server) 1052 return ERR_PTR(-ENOMEM); 1053 1054 error = -ENOMEM; 1055 fattr = nfs_alloc_fattr(); 1056 if (fattr == NULL) 1057 goto error; 1058 1059 /* Get a client representation */ 1060 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 1061 if (error < 0) 1062 goto error; 1063 1064 BUG_ON(!server->nfs_client); 1065 BUG_ON(!server->nfs_client->rpc_ops); 1066 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1067 1068 /* Probe the root fh to retrieve its FSID */ 1069 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 1070 if (error < 0) 1071 goto error; 1072 if (server->nfs_client->rpc_ops->version == 3) { 1073 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1074 server->namelen = NFS3_MAXNAMLEN; 1075 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 1076 server->caps |= NFS_CAP_READDIRPLUS; 1077 } else { 1078 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1079 server->namelen = NFS2_MAXNAMLEN; 1080 } 1081 1082 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1083 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr); 1084 if (error < 0) { 1085 dprintk("nfs_create_server: getattr error = %d\n", -error); 1086 goto error; 1087 } 1088 } 1089 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1090 1091 dprintk("Server FSID: %llx:%llx\n", 1092 (unsigned long long) server->fsid.major, 1093 (unsigned long long) server->fsid.minor); 1094 1095 nfs_server_insert_lists(server); 1096 server->mount_time = jiffies; 1097 nfs_free_fattr(fattr); 1098 return server; 1099 1100 error: 1101 nfs_free_fattr(fattr); 1102 nfs_free_server(server); 1103 return ERR_PTR(error); 1104 } 1105 EXPORT_SYMBOL_GPL(nfs_create_server); 1106 1107 /* 1108 * Clone an NFS2, NFS3 or NFS4 server record 1109 */ 1110 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1111 struct nfs_fh *fh, 1112 struct nfs_fattr *fattr, 1113 rpc_authflavor_t flavor) 1114 { 1115 struct nfs_server *server; 1116 struct nfs_fattr *fattr_fsinfo; 1117 int error; 1118 1119 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1120 (unsigned long long) fattr->fsid.major, 1121 (unsigned long long) fattr->fsid.minor); 1122 1123 server = nfs_alloc_server(); 1124 if (!server) 1125 return ERR_PTR(-ENOMEM); 1126 1127 error = -ENOMEM; 1128 fattr_fsinfo = nfs_alloc_fattr(); 1129 if (fattr_fsinfo == NULL) 1130 goto out_free_server; 1131 1132 /* Copy data from the source */ 1133 server->nfs_client = source->nfs_client; 1134 server->destroy = source->destroy; 1135 atomic_inc(&server->nfs_client->cl_count); 1136 nfs_server_copy_userdata(server, source); 1137 1138 server->fsid = fattr->fsid; 1139 1140 error = nfs_init_server_rpcclient(server, 1141 source->client->cl_timeout, 1142 flavor); 1143 if (error < 0) 1144 goto out_free_server; 1145 1146 /* probe the filesystem info for this server filesystem */ 1147 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1148 if (error < 0) 1149 goto out_free_server; 1150 1151 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1152 server->namelen = NFS4_MAXNAMLEN; 1153 1154 dprintk("Cloned FSID: %llx:%llx\n", 1155 (unsigned long long) server->fsid.major, 1156 (unsigned long long) server->fsid.minor); 1157 1158 error = nfs_start_lockd(server); 1159 if (error < 0) 1160 goto out_free_server; 1161 1162 nfs_server_insert_lists(server); 1163 server->mount_time = jiffies; 1164 1165 nfs_free_fattr(fattr_fsinfo); 1166 dprintk("<-- nfs_clone_server() = %p\n", server); 1167 return server; 1168 1169 out_free_server: 1170 nfs_free_fattr(fattr_fsinfo); 1171 nfs_free_server(server); 1172 dprintk("<-- nfs_clone_server() = error %d\n", error); 1173 return ERR_PTR(error); 1174 } 1175 EXPORT_SYMBOL_GPL(nfs_clone_server); 1176 1177 void nfs_clients_init(struct net *net) 1178 { 1179 struct nfs_net *nn = net_generic(net, nfs_net_id); 1180 1181 INIT_LIST_HEAD(&nn->nfs_client_list); 1182 INIT_LIST_HEAD(&nn->nfs_volume_list); 1183 #if IS_ENABLED(CONFIG_NFS_V4) 1184 idr_init(&nn->cb_ident_idr); 1185 #endif 1186 spin_lock_init(&nn->nfs_client_lock); 1187 nn->boot_time = CURRENT_TIME; 1188 } 1189 1190 #ifdef CONFIG_PROC_FS 1191 static struct proc_dir_entry *proc_fs_nfs; 1192 1193 static int nfs_server_list_open(struct inode *inode, struct file *file); 1194 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1195 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1196 static void nfs_server_list_stop(struct seq_file *p, void *v); 1197 static int nfs_server_list_show(struct seq_file *m, void *v); 1198 1199 static const struct seq_operations nfs_server_list_ops = { 1200 .start = nfs_server_list_start, 1201 .next = nfs_server_list_next, 1202 .stop = nfs_server_list_stop, 1203 .show = nfs_server_list_show, 1204 }; 1205 1206 static const struct file_operations nfs_server_list_fops = { 1207 .open = nfs_server_list_open, 1208 .read = seq_read, 1209 .llseek = seq_lseek, 1210 .release = seq_release, 1211 .owner = THIS_MODULE, 1212 }; 1213 1214 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1215 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1216 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1217 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1218 static int nfs_volume_list_show(struct seq_file *m, void *v); 1219 1220 static const struct seq_operations nfs_volume_list_ops = { 1221 .start = nfs_volume_list_start, 1222 .next = nfs_volume_list_next, 1223 .stop = nfs_volume_list_stop, 1224 .show = nfs_volume_list_show, 1225 }; 1226 1227 static const struct file_operations nfs_volume_list_fops = { 1228 .open = nfs_volume_list_open, 1229 .read = seq_read, 1230 .llseek = seq_lseek, 1231 .release = seq_release, 1232 .owner = THIS_MODULE, 1233 }; 1234 1235 /* 1236 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1237 * we're dealing 1238 */ 1239 static int nfs_server_list_open(struct inode *inode, struct file *file) 1240 { 1241 struct seq_file *m; 1242 int ret; 1243 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1244 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1245 1246 ret = seq_open(file, &nfs_server_list_ops); 1247 if (ret < 0) 1248 return ret; 1249 1250 m = file->private_data; 1251 m->private = net; 1252 1253 return 0; 1254 } 1255 1256 /* 1257 * set up the iterator to start reading from the server list and return the first item 1258 */ 1259 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1260 { 1261 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1262 1263 /* lock the list against modification */ 1264 spin_lock(&nn->nfs_client_lock); 1265 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1266 } 1267 1268 /* 1269 * move to next server 1270 */ 1271 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1272 { 1273 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1274 1275 return seq_list_next(v, &nn->nfs_client_list, pos); 1276 } 1277 1278 /* 1279 * clean up after reading from the transports list 1280 */ 1281 static void nfs_server_list_stop(struct seq_file *p, void *v) 1282 { 1283 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1284 1285 spin_unlock(&nn->nfs_client_lock); 1286 } 1287 1288 /* 1289 * display a header line followed by a load of call lines 1290 */ 1291 static int nfs_server_list_show(struct seq_file *m, void *v) 1292 { 1293 struct nfs_client *clp; 1294 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1295 1296 /* display header on line 1 */ 1297 if (v == &nn->nfs_client_list) { 1298 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1299 return 0; 1300 } 1301 1302 /* display one transport per line on subsequent lines */ 1303 clp = list_entry(v, struct nfs_client, cl_share_link); 1304 1305 /* Check if the client is initialized */ 1306 if (clp->cl_cons_state != NFS_CS_READY) 1307 return 0; 1308 1309 rcu_read_lock(); 1310 seq_printf(m, "v%u %s %s %3d %s\n", 1311 clp->rpc_ops->version, 1312 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1313 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1314 atomic_read(&clp->cl_count), 1315 clp->cl_hostname); 1316 rcu_read_unlock(); 1317 1318 return 0; 1319 } 1320 1321 /* 1322 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1323 */ 1324 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1325 { 1326 struct seq_file *m; 1327 int ret; 1328 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1329 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1330 1331 ret = seq_open(file, &nfs_volume_list_ops); 1332 if (ret < 0) 1333 return ret; 1334 1335 m = file->private_data; 1336 m->private = net; 1337 1338 return 0; 1339 } 1340 1341 /* 1342 * set up the iterator to start reading from the volume list and return the first item 1343 */ 1344 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1345 { 1346 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1347 1348 /* lock the list against modification */ 1349 spin_lock(&nn->nfs_client_lock); 1350 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1351 } 1352 1353 /* 1354 * move to next volume 1355 */ 1356 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1357 { 1358 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1359 1360 return seq_list_next(v, &nn->nfs_volume_list, pos); 1361 } 1362 1363 /* 1364 * clean up after reading from the transports list 1365 */ 1366 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1367 { 1368 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1369 1370 spin_unlock(&nn->nfs_client_lock); 1371 } 1372 1373 /* 1374 * display a header line followed by a load of call lines 1375 */ 1376 static int nfs_volume_list_show(struct seq_file *m, void *v) 1377 { 1378 struct nfs_server *server; 1379 struct nfs_client *clp; 1380 char dev[8], fsid[17]; 1381 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1382 1383 /* display header on line 1 */ 1384 if (v == &nn->nfs_volume_list) { 1385 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1386 return 0; 1387 } 1388 /* display one transport per line on subsequent lines */ 1389 server = list_entry(v, struct nfs_server, master_link); 1390 clp = server->nfs_client; 1391 1392 snprintf(dev, 8, "%u:%u", 1393 MAJOR(server->s_dev), MINOR(server->s_dev)); 1394 1395 snprintf(fsid, 17, "%llx:%llx", 1396 (unsigned long long) server->fsid.major, 1397 (unsigned long long) server->fsid.minor); 1398 1399 rcu_read_lock(); 1400 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1401 clp->rpc_ops->version, 1402 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1403 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1404 dev, 1405 fsid, 1406 nfs_server_fscache_state(server)); 1407 rcu_read_unlock(); 1408 1409 return 0; 1410 } 1411 1412 /* 1413 * initialise the /proc/fs/nfsfs/ directory 1414 */ 1415 int __init nfs_fs_proc_init(void) 1416 { 1417 struct proc_dir_entry *p; 1418 1419 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1420 if (!proc_fs_nfs) 1421 goto error_0; 1422 1423 /* a file of servers with which we're dealing */ 1424 p = proc_create("servers", S_IFREG|S_IRUGO, 1425 proc_fs_nfs, &nfs_server_list_fops); 1426 if (!p) 1427 goto error_1; 1428 1429 /* a file of volumes that we have mounted */ 1430 p = proc_create("volumes", S_IFREG|S_IRUGO, 1431 proc_fs_nfs, &nfs_volume_list_fops); 1432 if (!p) 1433 goto error_2; 1434 return 0; 1435 1436 error_2: 1437 remove_proc_entry("servers", proc_fs_nfs); 1438 error_1: 1439 remove_proc_entry("fs/nfsfs", NULL); 1440 error_0: 1441 return -ENOMEM; 1442 } 1443 1444 /* 1445 * clean up the /proc/fs/nfsfs/ directory 1446 */ 1447 void nfs_fs_proc_exit(void) 1448 { 1449 remove_proc_entry("volumes", proc_fs_nfs); 1450 remove_proc_entry("servers", proc_fs_nfs); 1451 remove_proc_entry("fs/nfsfs", NULL); 1452 } 1453 1454 #endif /* CONFIG_PROC_FS */ 1455