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/nfs_xdr.h> 38 39 #include <asm/system.h> 40 41 #include "nfs4_fs.h" 42 #include "callback.h" 43 #include "delegation.h" 44 #include "iostat.h" 45 #include "internal.h" 46 47 #define NFSDBG_FACILITY NFSDBG_CLIENT 48 49 static DEFINE_SPINLOCK(nfs_client_lock); 50 static LIST_HEAD(nfs_client_list); 51 static LIST_HEAD(nfs_volume_list); 52 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 53 54 /* 55 * RPC cruft for NFS 56 */ 57 static struct rpc_version *nfs_version[5] = { 58 [2] = &nfs_version2, 59 #ifdef CONFIG_NFS_V3 60 [3] = &nfs_version3, 61 #endif 62 #ifdef CONFIG_NFS_V4 63 [4] = &nfs_version4, 64 #endif 65 }; 66 67 struct rpc_program nfs_program = { 68 .name = "nfs", 69 .number = NFS_PROGRAM, 70 .nrvers = ARRAY_SIZE(nfs_version), 71 .version = nfs_version, 72 .stats = &nfs_rpcstat, 73 .pipe_dir_name = "/nfs", 74 }; 75 76 struct rpc_stat nfs_rpcstat = { 77 .program = &nfs_program 78 }; 79 80 81 #ifdef CONFIG_NFS_V3_ACL 82 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 83 static struct rpc_version * nfsacl_version[] = { 84 [3] = &nfsacl_version3, 85 }; 86 87 struct rpc_program nfsacl_program = { 88 .name = "nfsacl", 89 .number = NFS_ACL_PROGRAM, 90 .nrvers = ARRAY_SIZE(nfsacl_version), 91 .version = nfsacl_version, 92 .stats = &nfsacl_rpcstat, 93 }; 94 #endif /* CONFIG_NFS_V3_ACL */ 95 96 /* 97 * Allocate a shared client record 98 * 99 * Since these are allocated/deallocated very rarely, we don't 100 * bother putting them in a slab cache... 101 */ 102 static struct nfs_client *nfs_alloc_client(const char *hostname, 103 const struct sockaddr_in *addr, 104 int nfsversion) 105 { 106 struct nfs_client *clp; 107 108 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 109 goto error_0; 110 111 if (nfsversion == 4) { 112 if (nfs_callback_up() < 0) 113 goto error_2; 114 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 115 } 116 117 atomic_set(&clp->cl_count, 1); 118 clp->cl_cons_state = NFS_CS_INITING; 119 120 clp->cl_nfsversion = nfsversion; 121 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr)); 122 123 if (hostname) { 124 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL); 125 if (!clp->cl_hostname) 126 goto error_3; 127 } 128 129 INIT_LIST_HEAD(&clp->cl_superblocks); 130 clp->cl_rpcclient = ERR_PTR(-EINVAL); 131 132 #ifdef CONFIG_NFS_V4 133 init_rwsem(&clp->cl_sem); 134 INIT_LIST_HEAD(&clp->cl_delegations); 135 spin_lock_init(&clp->cl_lock); 136 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 137 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 138 clp->cl_boot_time = CURRENT_TIME; 139 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 140 #endif 141 142 return clp; 143 144 error_3: 145 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 146 nfs_callback_down(); 147 error_2: 148 kfree(clp); 149 error_0: 150 return NULL; 151 } 152 153 static void nfs4_shutdown_client(struct nfs_client *clp) 154 { 155 #ifdef CONFIG_NFS_V4 156 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 157 nfs4_kill_renewd(clp); 158 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners)); 159 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 160 nfs_idmap_delete(clp); 161 #endif 162 } 163 164 /* 165 * Destroy a shared client record 166 */ 167 static void nfs_free_client(struct nfs_client *clp) 168 { 169 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion); 170 171 nfs4_shutdown_client(clp); 172 173 /* -EIO all pending I/O */ 174 if (!IS_ERR(clp->cl_rpcclient)) 175 rpc_shutdown_client(clp->cl_rpcclient); 176 177 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 178 nfs_callback_down(); 179 180 kfree(clp->cl_hostname); 181 kfree(clp); 182 183 dprintk("<-- nfs_free_client()\n"); 184 } 185 186 /* 187 * Release a reference to a shared client record 188 */ 189 void nfs_put_client(struct nfs_client *clp) 190 { 191 if (!clp) 192 return; 193 194 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 195 196 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 197 list_del(&clp->cl_share_link); 198 spin_unlock(&nfs_client_lock); 199 200 BUG_ON(!list_empty(&clp->cl_superblocks)); 201 202 nfs_free_client(clp); 203 } 204 } 205 206 /* 207 * Find a client by address 208 * - caller must hold nfs_client_lock 209 */ 210 static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port) 211 { 212 struct nfs_client *clp; 213 214 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 215 /* Don't match clients that failed to initialise properly */ 216 if (clp->cl_cons_state < 0) 217 continue; 218 219 /* Different NFS versions cannot share the same nfs_client */ 220 if (clp->cl_nfsversion != nfsversion) 221 continue; 222 223 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr, 224 sizeof(clp->cl_addr.sin_addr)) != 0) 225 continue; 226 227 if (!match_port || clp->cl_addr.sin_port == addr->sin_port) 228 goto found; 229 } 230 231 return NULL; 232 233 found: 234 atomic_inc(&clp->cl_count); 235 return clp; 236 } 237 238 /* 239 * Find a client by IP address and protocol version 240 * - returns NULL if no such client 241 */ 242 struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion) 243 { 244 struct nfs_client *clp; 245 246 spin_lock(&nfs_client_lock); 247 clp = __nfs_find_client(addr, nfsversion, 0); 248 spin_unlock(&nfs_client_lock); 249 if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) { 250 nfs_put_client(clp); 251 clp = NULL; 252 } 253 return clp; 254 } 255 256 /* 257 * Look up a client by IP address and protocol version 258 * - creates a new record if one doesn't yet exist 259 */ 260 static struct nfs_client *nfs_get_client(const char *hostname, 261 const struct sockaddr_in *addr, 262 int nfsversion) 263 { 264 struct nfs_client *clp, *new = NULL; 265 int error; 266 267 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n", 268 hostname ?: "", NIPQUAD(addr->sin_addr), 269 addr->sin_port, nfsversion); 270 271 /* see if the client already exists */ 272 do { 273 spin_lock(&nfs_client_lock); 274 275 clp = __nfs_find_client(addr, nfsversion, 1); 276 if (clp) 277 goto found_client; 278 if (new) 279 goto install_client; 280 281 spin_unlock(&nfs_client_lock); 282 283 new = nfs_alloc_client(hostname, addr, nfsversion); 284 } while (new); 285 286 return ERR_PTR(-ENOMEM); 287 288 /* install a new client and return with it unready */ 289 install_client: 290 clp = new; 291 list_add(&clp->cl_share_link, &nfs_client_list); 292 spin_unlock(&nfs_client_lock); 293 dprintk("--> nfs_get_client() = %p [new]\n", clp); 294 return clp; 295 296 /* found an existing client 297 * - make sure it's ready before returning 298 */ 299 found_client: 300 spin_unlock(&nfs_client_lock); 301 302 if (new) 303 nfs_free_client(new); 304 305 error = wait_event_interruptible(nfs_client_active_wq, 306 clp->cl_cons_state != NFS_CS_INITING); 307 if (error < 0) { 308 nfs_put_client(clp); 309 return ERR_PTR(-ERESTARTSYS); 310 } 311 312 if (clp->cl_cons_state < NFS_CS_READY) { 313 error = clp->cl_cons_state; 314 nfs_put_client(clp); 315 return ERR_PTR(error); 316 } 317 318 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 319 320 dprintk("--> nfs_get_client() = %p [share]\n", clp); 321 return clp; 322 } 323 324 /* 325 * Mark a server as ready or failed 326 */ 327 static void nfs_mark_client_ready(struct nfs_client *clp, int state) 328 { 329 clp->cl_cons_state = state; 330 wake_up_all(&nfs_client_active_wq); 331 } 332 333 /* 334 * Initialise the timeout values for a connection 335 */ 336 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 337 unsigned int timeo, unsigned int retrans) 338 { 339 to->to_initval = timeo * HZ / 10; 340 to->to_retries = retrans; 341 if (!to->to_retries) 342 to->to_retries = 2; 343 344 switch (proto) { 345 case XPRT_TRANSPORT_TCP: 346 case XPRT_TRANSPORT_RDMA: 347 if (!to->to_initval) 348 to->to_initval = 60 * HZ; 349 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 350 to->to_initval = NFS_MAX_TCP_TIMEOUT; 351 to->to_increment = to->to_initval; 352 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 353 to->to_exponential = 0; 354 break; 355 case XPRT_TRANSPORT_UDP: 356 default: 357 if (!to->to_initval) 358 to->to_initval = 11 * HZ / 10; 359 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 360 to->to_initval = NFS_MAX_UDP_TIMEOUT; 361 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 362 to->to_exponential = 1; 363 break; 364 } 365 } 366 367 /* 368 * Create an RPC client handle 369 */ 370 static int nfs_create_rpc_client(struct nfs_client *clp, int proto, 371 unsigned int timeo, 372 unsigned int retrans, 373 rpc_authflavor_t flavor, 374 int flags) 375 { 376 struct rpc_timeout timeparms; 377 struct rpc_clnt *clnt = NULL; 378 struct rpc_create_args args = { 379 .protocol = proto, 380 .address = (struct sockaddr *)&clp->cl_addr, 381 .addrsize = sizeof(clp->cl_addr), 382 .timeout = &timeparms, 383 .servername = clp->cl_hostname, 384 .program = &nfs_program, 385 .version = clp->rpc_ops->version, 386 .authflavor = flavor, 387 .flags = flags, 388 }; 389 390 if (!IS_ERR(clp->cl_rpcclient)) 391 return 0; 392 393 nfs_init_timeout_values(&timeparms, proto, timeo, retrans); 394 clp->retrans_timeo = timeparms.to_initval; 395 clp->retrans_count = timeparms.to_retries; 396 397 clnt = rpc_create(&args); 398 if (IS_ERR(clnt)) { 399 dprintk("%s: cannot create RPC client. Error = %ld\n", 400 __FUNCTION__, PTR_ERR(clnt)); 401 return PTR_ERR(clnt); 402 } 403 404 clp->cl_rpcclient = clnt; 405 return 0; 406 } 407 408 /* 409 * Version 2 or 3 client destruction 410 */ 411 static void nfs_destroy_server(struct nfs_server *server) 412 { 413 if (!IS_ERR(server->client_acl)) 414 rpc_shutdown_client(server->client_acl); 415 416 if (!(server->flags & NFS_MOUNT_NONLM)) 417 lockd_down(); /* release rpc.lockd */ 418 } 419 420 /* 421 * Version 2 or 3 lockd setup 422 */ 423 static int nfs_start_lockd(struct nfs_server *server) 424 { 425 int error = 0; 426 427 if (server->nfs_client->cl_nfsversion > 3) 428 goto out; 429 if (server->flags & NFS_MOUNT_NONLM) 430 goto out; 431 error = lockd_up((server->flags & NFS_MOUNT_TCP) ? 432 IPPROTO_TCP : IPPROTO_UDP); 433 if (error < 0) 434 server->flags |= NFS_MOUNT_NONLM; 435 else 436 server->destroy = nfs_destroy_server; 437 out: 438 return error; 439 } 440 441 /* 442 * Initialise an NFSv3 ACL client connection 443 */ 444 #ifdef CONFIG_NFS_V3_ACL 445 static void nfs_init_server_aclclient(struct nfs_server *server) 446 { 447 if (server->nfs_client->cl_nfsversion != 3) 448 goto out_noacl; 449 if (server->flags & NFS_MOUNT_NOACL) 450 goto out_noacl; 451 452 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 453 if (IS_ERR(server->client_acl)) 454 goto out_noacl; 455 456 /* No errors! Assume that Sun nfsacls are supported */ 457 server->caps |= NFS_CAP_ACLS; 458 return; 459 460 out_noacl: 461 server->caps &= ~NFS_CAP_ACLS; 462 } 463 #else 464 static inline void nfs_init_server_aclclient(struct nfs_server *server) 465 { 466 server->flags &= ~NFS_MOUNT_NOACL; 467 server->caps &= ~NFS_CAP_ACLS; 468 } 469 #endif 470 471 /* 472 * Create a general RPC client 473 */ 474 static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour) 475 { 476 struct nfs_client *clp = server->nfs_client; 477 478 server->client = rpc_clone_client(clp->cl_rpcclient); 479 if (IS_ERR(server->client)) { 480 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__); 481 return PTR_ERR(server->client); 482 } 483 484 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 485 struct rpc_auth *auth; 486 487 auth = rpcauth_create(pseudoflavour, server->client); 488 if (IS_ERR(auth)) { 489 dprintk("%s: couldn't create credcache!\n", __FUNCTION__); 490 return PTR_ERR(auth); 491 } 492 } 493 server->client->cl_softrtry = 0; 494 if (server->flags & NFS_MOUNT_SOFT) 495 server->client->cl_softrtry = 1; 496 497 server->client->cl_intr = 0; 498 if (server->flags & NFS4_MOUNT_INTR) 499 server->client->cl_intr = 1; 500 501 return 0; 502 } 503 504 /* 505 * Initialise an NFS2 or NFS3 client 506 */ 507 static int nfs_init_client(struct nfs_client *clp, 508 const struct nfs_parsed_mount_data *data) 509 { 510 int error; 511 512 if (clp->cl_cons_state == NFS_CS_READY) { 513 /* the client is already initialised */ 514 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 515 return 0; 516 } 517 518 /* Check NFS protocol revision and initialize RPC op vector */ 519 clp->rpc_ops = &nfs_v2_clientops; 520 #ifdef CONFIG_NFS_V3 521 if (clp->cl_nfsversion == 3) 522 clp->rpc_ops = &nfs_v3_clientops; 523 #endif 524 /* 525 * Create a client RPC handle for doing FSSTAT with UNIX auth only 526 * - RFC 2623, sec 2.3.2 527 */ 528 error = nfs_create_rpc_client(clp, data->nfs_server.protocol, 529 data->timeo, data->retrans, RPC_AUTH_UNIX, 0); 530 if (error < 0) 531 goto error; 532 nfs_mark_client_ready(clp, NFS_CS_READY); 533 return 0; 534 535 error: 536 nfs_mark_client_ready(clp, error); 537 dprintk("<-- nfs_init_client() = xerror %d\n", error); 538 return error; 539 } 540 541 /* 542 * Create a version 2 or 3 client 543 */ 544 static int nfs_init_server(struct nfs_server *server, 545 const struct nfs_parsed_mount_data *data) 546 { 547 struct nfs_client *clp; 548 int error, nfsvers = 2; 549 550 dprintk("--> nfs_init_server()\n"); 551 552 #ifdef CONFIG_NFS_V3 553 if (data->flags & NFS_MOUNT_VER3) 554 nfsvers = 3; 555 #endif 556 557 /* Allocate or find a client reference we can use */ 558 clp = nfs_get_client(data->nfs_server.hostname, 559 &data->nfs_server.address, nfsvers); 560 if (IS_ERR(clp)) { 561 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 562 return PTR_ERR(clp); 563 } 564 565 error = nfs_init_client(clp, data); 566 if (error < 0) 567 goto error; 568 569 server->nfs_client = clp; 570 571 /* Initialise the client representation from the mount data */ 572 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 573 574 if (data->rsize) 575 server->rsize = nfs_block_size(data->rsize, NULL); 576 if (data->wsize) 577 server->wsize = nfs_block_size(data->wsize, NULL); 578 579 server->acregmin = data->acregmin * HZ; 580 server->acregmax = data->acregmax * HZ; 581 server->acdirmin = data->acdirmin * HZ; 582 server->acdirmax = data->acdirmax * HZ; 583 584 /* Start lockd here, before we might error out */ 585 error = nfs_start_lockd(server); 586 if (error < 0) 587 goto error; 588 589 error = nfs_init_server_rpcclient(server, data->auth_flavors[0]); 590 if (error < 0) 591 goto error; 592 593 server->namelen = data->namlen; 594 /* Create a client RPC handle for the NFSv3 ACL management interface */ 595 nfs_init_server_aclclient(server); 596 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 597 return 0; 598 599 error: 600 server->nfs_client = NULL; 601 nfs_put_client(clp); 602 dprintk("<-- nfs_init_server() = xerror %d\n", error); 603 return error; 604 } 605 606 /* 607 * Load up the server record from information gained in an fsinfo record 608 */ 609 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 610 { 611 unsigned long max_rpc_payload; 612 613 /* Work out a lot of parameters */ 614 if (server->rsize == 0) 615 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 616 if (server->wsize == 0) 617 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 618 619 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 620 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 621 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 622 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 623 624 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 625 if (server->rsize > max_rpc_payload) 626 server->rsize = max_rpc_payload; 627 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 628 server->rsize = NFS_MAX_FILE_IO_SIZE; 629 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 630 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 631 632 if (server->wsize > max_rpc_payload) 633 server->wsize = max_rpc_payload; 634 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 635 server->wsize = NFS_MAX_FILE_IO_SIZE; 636 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 637 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 638 639 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 640 if (server->dtsize > PAGE_CACHE_SIZE) 641 server->dtsize = PAGE_CACHE_SIZE; 642 if (server->dtsize > server->rsize) 643 server->dtsize = server->rsize; 644 645 if (server->flags & NFS_MOUNT_NOAC) { 646 server->acregmin = server->acregmax = 0; 647 server->acdirmin = server->acdirmax = 0; 648 } 649 650 server->maxfilesize = fsinfo->maxfilesize; 651 652 /* We're airborne Set socket buffersize */ 653 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 654 } 655 656 /* 657 * Probe filesystem information, including the FSID on v2/v3 658 */ 659 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 660 { 661 struct nfs_fsinfo fsinfo; 662 struct nfs_client *clp = server->nfs_client; 663 int error; 664 665 dprintk("--> nfs_probe_fsinfo()\n"); 666 667 if (clp->rpc_ops->set_capabilities != NULL) { 668 error = clp->rpc_ops->set_capabilities(server, mntfh); 669 if (error < 0) 670 goto out_error; 671 } 672 673 fsinfo.fattr = fattr; 674 nfs_fattr_init(fattr); 675 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 676 if (error < 0) 677 goto out_error; 678 679 nfs_server_set_fsinfo(server, &fsinfo); 680 681 /* Get some general file system info */ 682 if (server->namelen == 0) { 683 struct nfs_pathconf pathinfo; 684 685 pathinfo.fattr = fattr; 686 nfs_fattr_init(fattr); 687 688 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 689 server->namelen = pathinfo.max_namelen; 690 } 691 692 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 693 return 0; 694 695 out_error: 696 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 697 return error; 698 } 699 700 /* 701 * Copy useful information when duplicating a server record 702 */ 703 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 704 { 705 target->flags = source->flags; 706 target->acregmin = source->acregmin; 707 target->acregmax = source->acregmax; 708 target->acdirmin = source->acdirmin; 709 target->acdirmax = source->acdirmax; 710 target->caps = source->caps; 711 } 712 713 /* 714 * Allocate and initialise a server record 715 */ 716 static struct nfs_server *nfs_alloc_server(void) 717 { 718 struct nfs_server *server; 719 720 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 721 if (!server) 722 return NULL; 723 724 server->client = server->client_acl = ERR_PTR(-EINVAL); 725 726 /* Zero out the NFS state stuff */ 727 INIT_LIST_HEAD(&server->client_link); 728 INIT_LIST_HEAD(&server->master_link); 729 730 server->io_stats = nfs_alloc_iostats(); 731 if (!server->io_stats) { 732 kfree(server); 733 return NULL; 734 } 735 736 return server; 737 } 738 739 /* 740 * Free up a server record 741 */ 742 void nfs_free_server(struct nfs_server *server) 743 { 744 dprintk("--> nfs_free_server()\n"); 745 746 spin_lock(&nfs_client_lock); 747 list_del(&server->client_link); 748 list_del(&server->master_link); 749 spin_unlock(&nfs_client_lock); 750 751 if (server->destroy != NULL) 752 server->destroy(server); 753 if (!IS_ERR(server->client)) 754 rpc_shutdown_client(server->client); 755 756 nfs_put_client(server->nfs_client); 757 758 nfs_free_iostats(server->io_stats); 759 kfree(server); 760 nfs_release_automount_timer(); 761 dprintk("<-- nfs_free_server()\n"); 762 } 763 764 /* 765 * Create a version 2 or 3 volume record 766 * - keyed on server and FSID 767 */ 768 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 769 struct nfs_fh *mntfh) 770 { 771 struct nfs_server *server; 772 struct nfs_fattr fattr; 773 int error; 774 775 server = nfs_alloc_server(); 776 if (!server) 777 return ERR_PTR(-ENOMEM); 778 779 /* Get a client representation */ 780 error = nfs_init_server(server, data); 781 if (error < 0) 782 goto error; 783 784 BUG_ON(!server->nfs_client); 785 BUG_ON(!server->nfs_client->rpc_ops); 786 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 787 788 /* Probe the root fh to retrieve its FSID */ 789 error = nfs_probe_fsinfo(server, mntfh, &fattr); 790 if (error < 0) 791 goto error; 792 if (server->nfs_client->rpc_ops->version == 3) { 793 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 794 server->namelen = NFS3_MAXNAMLEN; 795 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 796 server->caps |= NFS_CAP_READDIRPLUS; 797 } else { 798 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 799 server->namelen = NFS2_MAXNAMLEN; 800 } 801 802 if (!(fattr.valid & NFS_ATTR_FATTR)) { 803 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 804 if (error < 0) { 805 dprintk("nfs_create_server: getattr error = %d\n", -error); 806 goto error; 807 } 808 } 809 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 810 811 dprintk("Server FSID: %llx:%llx\n", 812 (unsigned long long) server->fsid.major, 813 (unsigned long long) server->fsid.minor); 814 815 BUG_ON(!server->nfs_client); 816 BUG_ON(!server->nfs_client->rpc_ops); 817 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 818 819 spin_lock(&nfs_client_lock); 820 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 821 list_add_tail(&server->master_link, &nfs_volume_list); 822 spin_unlock(&nfs_client_lock); 823 824 server->mount_time = jiffies; 825 return server; 826 827 error: 828 nfs_free_server(server); 829 return ERR_PTR(error); 830 } 831 832 #ifdef CONFIG_NFS_V4 833 /* 834 * Initialise an NFS4 client record 835 */ 836 static int nfs4_init_client(struct nfs_client *clp, 837 int proto, int timeo, int retrans, 838 const char *ip_addr, 839 rpc_authflavor_t authflavour) 840 { 841 int error; 842 843 if (clp->cl_cons_state == NFS_CS_READY) { 844 /* the client is initialised already */ 845 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 846 return 0; 847 } 848 849 /* Check NFS protocol revision and initialize RPC op vector */ 850 clp->rpc_ops = &nfs_v4_clientops; 851 852 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour, 853 RPC_CLNT_CREATE_DISCRTRY); 854 if (error < 0) 855 goto error; 856 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 857 858 error = nfs_idmap_new(clp); 859 if (error < 0) { 860 dprintk("%s: failed to create idmapper. Error = %d\n", 861 __FUNCTION__, error); 862 goto error; 863 } 864 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 865 866 nfs_mark_client_ready(clp, NFS_CS_READY); 867 return 0; 868 869 error: 870 nfs_mark_client_ready(clp, error); 871 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 872 return error; 873 } 874 875 /* 876 * Set up an NFS4 client 877 */ 878 static int nfs4_set_client(struct nfs_server *server, 879 const char *hostname, const struct sockaddr_in *addr, 880 const char *ip_addr, 881 rpc_authflavor_t authflavour, 882 int proto, int timeo, int retrans) 883 { 884 struct nfs_client *clp; 885 int error; 886 887 dprintk("--> nfs4_set_client()\n"); 888 889 /* Allocate or find a client reference we can use */ 890 clp = nfs_get_client(hostname, addr, 4); 891 if (IS_ERR(clp)) { 892 error = PTR_ERR(clp); 893 goto error; 894 } 895 error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour); 896 if (error < 0) 897 goto error_put; 898 899 server->nfs_client = clp; 900 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 901 return 0; 902 903 error_put: 904 nfs_put_client(clp); 905 error: 906 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 907 return error; 908 } 909 910 /* 911 * Create a version 4 volume record 912 */ 913 static int nfs4_init_server(struct nfs_server *server, 914 const struct nfs_parsed_mount_data *data) 915 { 916 int error; 917 918 dprintk("--> nfs4_init_server()\n"); 919 920 /* Initialise the client representation from the mount data */ 921 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 922 server->caps |= NFS_CAP_ATOMIC_OPEN; 923 924 if (data->rsize) 925 server->rsize = nfs_block_size(data->rsize, NULL); 926 if (data->wsize) 927 server->wsize = nfs_block_size(data->wsize, NULL); 928 929 server->acregmin = data->acregmin * HZ; 930 server->acregmax = data->acregmax * HZ; 931 server->acdirmin = data->acdirmin * HZ; 932 server->acdirmax = data->acdirmax * HZ; 933 934 error = nfs_init_server_rpcclient(server, data->auth_flavors[0]); 935 936 /* Done */ 937 dprintk("<-- nfs4_init_server() = %d\n", error); 938 return error; 939 } 940 941 /* 942 * Create a version 4 volume record 943 * - keyed on server and FSID 944 */ 945 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 946 struct nfs_fh *mntfh) 947 { 948 struct nfs_fattr fattr; 949 struct nfs_server *server; 950 int error; 951 952 dprintk("--> nfs4_create_server()\n"); 953 954 server = nfs_alloc_server(); 955 if (!server) 956 return ERR_PTR(-ENOMEM); 957 958 /* Get a client record */ 959 error = nfs4_set_client(server, 960 data->nfs_server.hostname, 961 &data->nfs_server.address, 962 data->client_address, 963 data->auth_flavors[0], 964 data->nfs_server.protocol, 965 data->timeo, data->retrans); 966 if (error < 0) 967 goto error; 968 969 /* set up the general RPC client */ 970 error = nfs4_init_server(server, data); 971 if (error < 0) 972 goto error; 973 974 BUG_ON(!server->nfs_client); 975 BUG_ON(!server->nfs_client->rpc_ops); 976 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 977 978 /* Probe the root fh to retrieve its FSID */ 979 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path); 980 if (error < 0) 981 goto error; 982 983 dprintk("Server FSID: %llx:%llx\n", 984 (unsigned long long) server->fsid.major, 985 (unsigned long long) server->fsid.minor); 986 dprintk("Mount FH: %d\n", mntfh->size); 987 988 error = nfs_probe_fsinfo(server, mntfh, &fattr); 989 if (error < 0) 990 goto error; 991 992 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 993 server->namelen = NFS4_MAXNAMLEN; 994 995 BUG_ON(!server->nfs_client); 996 BUG_ON(!server->nfs_client->rpc_ops); 997 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 998 999 spin_lock(&nfs_client_lock); 1000 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1001 list_add_tail(&server->master_link, &nfs_volume_list); 1002 spin_unlock(&nfs_client_lock); 1003 1004 server->mount_time = jiffies; 1005 dprintk("<-- nfs4_create_server() = %p\n", server); 1006 return server; 1007 1008 error: 1009 nfs_free_server(server); 1010 dprintk("<-- nfs4_create_server() = error %d\n", error); 1011 return ERR_PTR(error); 1012 } 1013 1014 /* 1015 * Create an NFS4 referral server record 1016 */ 1017 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1018 struct nfs_fh *mntfh) 1019 { 1020 struct nfs_client *parent_client; 1021 struct nfs_server *server, *parent_server; 1022 struct nfs_fattr fattr; 1023 int error; 1024 1025 dprintk("--> nfs4_create_referral_server()\n"); 1026 1027 server = nfs_alloc_server(); 1028 if (!server) 1029 return ERR_PTR(-ENOMEM); 1030 1031 parent_server = NFS_SB(data->sb); 1032 parent_client = parent_server->nfs_client; 1033 1034 /* Get a client representation. 1035 * Note: NFSv4 always uses TCP, */ 1036 error = nfs4_set_client(server, data->hostname, data->addr, 1037 parent_client->cl_ipaddr, 1038 data->authflavor, 1039 parent_server->client->cl_xprt->prot, 1040 parent_client->retrans_timeo, 1041 parent_client->retrans_count); 1042 if (error < 0) 1043 goto error; 1044 1045 /* Initialise the client representation from the parent server */ 1046 nfs_server_copy_userdata(server, parent_server); 1047 server->caps |= NFS_CAP_ATOMIC_OPEN; 1048 1049 error = nfs_init_server_rpcclient(server, data->authflavor); 1050 if (error < 0) 1051 goto error; 1052 1053 BUG_ON(!server->nfs_client); 1054 BUG_ON(!server->nfs_client->rpc_ops); 1055 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1056 1057 /* Probe the root fh to retrieve its FSID and filehandle */ 1058 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1059 if (error < 0) 1060 goto error; 1061 1062 /* probe the filesystem info for this server filesystem */ 1063 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1064 if (error < 0) 1065 goto error; 1066 1067 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1068 server->namelen = NFS4_MAXNAMLEN; 1069 1070 dprintk("Referral FSID: %llx:%llx\n", 1071 (unsigned long long) server->fsid.major, 1072 (unsigned long long) server->fsid.minor); 1073 1074 spin_lock(&nfs_client_lock); 1075 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1076 list_add_tail(&server->master_link, &nfs_volume_list); 1077 spin_unlock(&nfs_client_lock); 1078 1079 server->mount_time = jiffies; 1080 1081 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1082 return server; 1083 1084 error: 1085 nfs_free_server(server); 1086 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1087 return ERR_PTR(error); 1088 } 1089 1090 #endif /* CONFIG_NFS_V4 */ 1091 1092 /* 1093 * Clone an NFS2, NFS3 or NFS4 server record 1094 */ 1095 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1096 struct nfs_fh *fh, 1097 struct nfs_fattr *fattr) 1098 { 1099 struct nfs_server *server; 1100 struct nfs_fattr fattr_fsinfo; 1101 int error; 1102 1103 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1104 (unsigned long long) fattr->fsid.major, 1105 (unsigned long long) fattr->fsid.minor); 1106 1107 server = nfs_alloc_server(); 1108 if (!server) 1109 return ERR_PTR(-ENOMEM); 1110 1111 /* Copy data from the source */ 1112 server->nfs_client = source->nfs_client; 1113 atomic_inc(&server->nfs_client->cl_count); 1114 nfs_server_copy_userdata(server, source); 1115 1116 server->fsid = fattr->fsid; 1117 1118 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor); 1119 if (error < 0) 1120 goto out_free_server; 1121 if (!IS_ERR(source->client_acl)) 1122 nfs_init_server_aclclient(server); 1123 1124 /* probe the filesystem info for this server filesystem */ 1125 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1126 if (error < 0) 1127 goto out_free_server; 1128 1129 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1130 server->namelen = NFS4_MAXNAMLEN; 1131 1132 dprintk("Cloned FSID: %llx:%llx\n", 1133 (unsigned long long) server->fsid.major, 1134 (unsigned long long) server->fsid.minor); 1135 1136 error = nfs_start_lockd(server); 1137 if (error < 0) 1138 goto out_free_server; 1139 1140 spin_lock(&nfs_client_lock); 1141 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1142 list_add_tail(&server->master_link, &nfs_volume_list); 1143 spin_unlock(&nfs_client_lock); 1144 1145 server->mount_time = jiffies; 1146 1147 dprintk("<-- nfs_clone_server() = %p\n", server); 1148 return server; 1149 1150 out_free_server: 1151 nfs_free_server(server); 1152 dprintk("<-- nfs_clone_server() = error %d\n", error); 1153 return ERR_PTR(error); 1154 } 1155 1156 #ifdef CONFIG_PROC_FS 1157 static struct proc_dir_entry *proc_fs_nfs; 1158 1159 static int nfs_server_list_open(struct inode *inode, struct file *file); 1160 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1161 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1162 static void nfs_server_list_stop(struct seq_file *p, void *v); 1163 static int nfs_server_list_show(struct seq_file *m, void *v); 1164 1165 static struct seq_operations nfs_server_list_ops = { 1166 .start = nfs_server_list_start, 1167 .next = nfs_server_list_next, 1168 .stop = nfs_server_list_stop, 1169 .show = nfs_server_list_show, 1170 }; 1171 1172 static const struct file_operations nfs_server_list_fops = { 1173 .open = nfs_server_list_open, 1174 .read = seq_read, 1175 .llseek = seq_lseek, 1176 .release = seq_release, 1177 }; 1178 1179 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1180 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1181 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1182 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1183 static int nfs_volume_list_show(struct seq_file *m, void *v); 1184 1185 static struct seq_operations nfs_volume_list_ops = { 1186 .start = nfs_volume_list_start, 1187 .next = nfs_volume_list_next, 1188 .stop = nfs_volume_list_stop, 1189 .show = nfs_volume_list_show, 1190 }; 1191 1192 static const struct file_operations nfs_volume_list_fops = { 1193 .open = nfs_volume_list_open, 1194 .read = seq_read, 1195 .llseek = seq_lseek, 1196 .release = seq_release, 1197 }; 1198 1199 /* 1200 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1201 * we're dealing 1202 */ 1203 static int nfs_server_list_open(struct inode *inode, struct file *file) 1204 { 1205 struct seq_file *m; 1206 int ret; 1207 1208 ret = seq_open(file, &nfs_server_list_ops); 1209 if (ret < 0) 1210 return ret; 1211 1212 m = file->private_data; 1213 m->private = PDE(inode)->data; 1214 1215 return 0; 1216 } 1217 1218 /* 1219 * set up the iterator to start reading from the server list and return the first item 1220 */ 1221 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1222 { 1223 /* lock the list against modification */ 1224 spin_lock(&nfs_client_lock); 1225 return seq_list_start_head(&nfs_client_list, *_pos); 1226 } 1227 1228 /* 1229 * move to next server 1230 */ 1231 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1232 { 1233 return seq_list_next(v, &nfs_client_list, pos); 1234 } 1235 1236 /* 1237 * clean up after reading from the transports list 1238 */ 1239 static void nfs_server_list_stop(struct seq_file *p, void *v) 1240 { 1241 spin_unlock(&nfs_client_lock); 1242 } 1243 1244 /* 1245 * display a header line followed by a load of call lines 1246 */ 1247 static int nfs_server_list_show(struct seq_file *m, void *v) 1248 { 1249 struct nfs_client *clp; 1250 1251 /* display header on line 1 */ 1252 if (v == &nfs_client_list) { 1253 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1254 return 0; 1255 } 1256 1257 /* display one transport per line on subsequent lines */ 1258 clp = list_entry(v, struct nfs_client, cl_share_link); 1259 1260 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n", 1261 clp->cl_nfsversion, 1262 NIPQUAD(clp->cl_addr.sin_addr), 1263 ntohs(clp->cl_addr.sin_port), 1264 atomic_read(&clp->cl_count), 1265 clp->cl_hostname); 1266 1267 return 0; 1268 } 1269 1270 /* 1271 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1272 */ 1273 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1274 { 1275 struct seq_file *m; 1276 int ret; 1277 1278 ret = seq_open(file, &nfs_volume_list_ops); 1279 if (ret < 0) 1280 return ret; 1281 1282 m = file->private_data; 1283 m->private = PDE(inode)->data; 1284 1285 return 0; 1286 } 1287 1288 /* 1289 * set up the iterator to start reading from the volume list and return the first item 1290 */ 1291 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1292 { 1293 /* lock the list against modification */ 1294 spin_lock(&nfs_client_lock); 1295 return seq_list_start_head(&nfs_volume_list, *_pos); 1296 } 1297 1298 /* 1299 * move to next volume 1300 */ 1301 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1302 { 1303 return seq_list_next(v, &nfs_volume_list, pos); 1304 } 1305 1306 /* 1307 * clean up after reading from the transports list 1308 */ 1309 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1310 { 1311 spin_unlock(&nfs_client_lock); 1312 } 1313 1314 /* 1315 * display a header line followed by a load of call lines 1316 */ 1317 static int nfs_volume_list_show(struct seq_file *m, void *v) 1318 { 1319 struct nfs_server *server; 1320 struct nfs_client *clp; 1321 char dev[8], fsid[17]; 1322 1323 /* display header on line 1 */ 1324 if (v == &nfs_volume_list) { 1325 seq_puts(m, "NV SERVER PORT DEV FSID\n"); 1326 return 0; 1327 } 1328 /* display one transport per line on subsequent lines */ 1329 server = list_entry(v, struct nfs_server, master_link); 1330 clp = server->nfs_client; 1331 1332 snprintf(dev, 8, "%u:%u", 1333 MAJOR(server->s_dev), MINOR(server->s_dev)); 1334 1335 snprintf(fsid, 17, "%llx:%llx", 1336 (unsigned long long) server->fsid.major, 1337 (unsigned long long) server->fsid.minor); 1338 1339 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n", 1340 clp->cl_nfsversion, 1341 NIPQUAD(clp->cl_addr.sin_addr), 1342 ntohs(clp->cl_addr.sin_port), 1343 dev, 1344 fsid); 1345 1346 return 0; 1347 } 1348 1349 /* 1350 * initialise the /proc/fs/nfsfs/ directory 1351 */ 1352 int __init nfs_fs_proc_init(void) 1353 { 1354 struct proc_dir_entry *p; 1355 1356 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs); 1357 if (!proc_fs_nfs) 1358 goto error_0; 1359 1360 proc_fs_nfs->owner = THIS_MODULE; 1361 1362 /* a file of servers with which we're dealing */ 1363 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs); 1364 if (!p) 1365 goto error_1; 1366 1367 p->proc_fops = &nfs_server_list_fops; 1368 p->owner = THIS_MODULE; 1369 1370 /* a file of volumes that we have mounted */ 1371 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs); 1372 if (!p) 1373 goto error_2; 1374 1375 p->proc_fops = &nfs_volume_list_fops; 1376 p->owner = THIS_MODULE; 1377 return 0; 1378 1379 error_2: 1380 remove_proc_entry("servers", proc_fs_nfs); 1381 error_1: 1382 remove_proc_entry("nfsfs", proc_root_fs); 1383 error_0: 1384 return -ENOMEM; 1385 } 1386 1387 /* 1388 * clean up the /proc/fs/nfsfs/ directory 1389 */ 1390 void nfs_fs_proc_exit(void) 1391 { 1392 remove_proc_entry("volumes", proc_fs_nfs); 1393 remove_proc_entry("servers", proc_fs_nfs); 1394 remove_proc_entry("nfsfs", proc_root_fs); 1395 } 1396 1397 #endif /* CONFIG_PROC_FS */ 1398