1 /* 2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 3 * Written by David Howells (dhowells@redhat.com) 4 */ 5 #include <linux/module.h> 6 #include <linux/nfs_fs.h> 7 #include <linux/nfs_idmap.h> 8 #include <linux/nfs_mount.h> 9 #include <linux/sunrpc/auth.h> 10 #include <linux/sunrpc/xprt.h> 11 #include <linux/sunrpc/bc_xprt.h> 12 #include "internal.h" 13 #include "callback.h" 14 #include "delegation.h" 15 #include "pnfs.h" 16 #include "netns.h" 17 18 #define NFSDBG_FACILITY NFSDBG_CLIENT 19 20 /* 21 * Get a unique NFSv4.0 callback identifier which will be used 22 * by the V4.0 callback service to lookup the nfs_client struct 23 */ 24 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 25 { 26 int ret = 0; 27 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 28 29 if (clp->rpc_ops->version != 4 || minorversion != 0) 30 return ret; 31 retry: 32 if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL)) 33 return -ENOMEM; 34 spin_lock(&nn->nfs_client_lock); 35 ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident); 36 spin_unlock(&nn->nfs_client_lock); 37 if (ret == -EAGAIN) 38 goto retry; 39 return ret; 40 } 41 42 #ifdef CONFIG_NFS_V4_1 43 static void nfs4_shutdown_session(struct nfs_client *clp) 44 { 45 if (nfs4_has_session(clp)) { 46 nfs4_destroy_session(clp->cl_session); 47 nfs4_destroy_clientid(clp); 48 } 49 50 } 51 #else /* CONFIG_NFS_V4_1 */ 52 static void nfs4_shutdown_session(struct nfs_client *clp) 53 { 54 } 55 #endif /* CONFIG_NFS_V4_1 */ 56 57 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) 58 { 59 int err; 60 struct nfs_client *clp = nfs_alloc_client(cl_init); 61 if (IS_ERR(clp)) 62 return clp; 63 64 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 65 if (err) 66 goto error; 67 68 spin_lock_init(&clp->cl_lock); 69 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 70 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 71 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 72 clp->cl_minorversion = cl_init->minorversion; 73 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 74 return clp; 75 76 error: 77 nfs_free_client(clp); 78 return ERR_PTR(err); 79 } 80 81 /* 82 * Destroy the NFS4 callback service 83 */ 84 static void nfs4_destroy_callback(struct nfs_client *clp) 85 { 86 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 87 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 88 } 89 90 static void nfs4_shutdown_client(struct nfs_client *clp) 91 { 92 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 93 nfs4_kill_renewd(clp); 94 nfs4_shutdown_session(clp); 95 nfs4_destroy_callback(clp); 96 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 97 nfs_idmap_delete(clp); 98 99 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 100 kfree(clp->cl_serverowner); 101 kfree(clp->cl_serverscope); 102 kfree(clp->cl_implid); 103 } 104 105 void nfs4_free_client(struct nfs_client *clp) 106 { 107 nfs4_shutdown_client(clp); 108 nfs_free_client(clp); 109 } 110 111 /* 112 * Initialize the NFS4 callback service 113 */ 114 static int nfs4_init_callback(struct nfs_client *clp) 115 { 116 int error; 117 118 if (clp->rpc_ops->version == 4) { 119 struct rpc_xprt *xprt; 120 121 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 122 123 if (nfs4_has_session(clp)) { 124 error = xprt_setup_backchannel(xprt, 125 NFS41_BC_MIN_CALLBACKS); 126 if (error < 0) 127 return error; 128 } 129 130 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 131 if (error < 0) { 132 dprintk("%s: failed to start callback. Error = %d\n", 133 __func__, error); 134 return error; 135 } 136 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 137 } 138 return 0; 139 } 140 141 /* 142 * Initialize the minor version specific parts of an NFS4 client record 143 */ 144 static int nfs4_init_client_minor_version(struct nfs_client *clp) 145 { 146 #if defined(CONFIG_NFS_V4_1) 147 if (clp->cl_mvops->minor_version) { 148 struct nfs4_session *session = NULL; 149 /* 150 * Create the session and mark it expired. 151 * When a SEQUENCE operation encounters the expired session 152 * it will do session recovery to initialize it. 153 */ 154 session = nfs4_alloc_session(clp); 155 if (!session) 156 return -ENOMEM; 157 158 clp->cl_session = session; 159 /* 160 * The create session reply races with the server back 161 * channel probe. Mark the client NFS_CS_SESSION_INITING 162 * so that the client back channel can find the 163 * nfs_client struct 164 */ 165 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 166 } 167 #endif /* CONFIG_NFS_V4_1 */ 168 169 return nfs4_init_callback(clp); 170 } 171 172 /** 173 * nfs4_init_client - Initialise an NFS4 client record 174 * 175 * @clp: nfs_client to initialise 176 * @timeparms: timeout parameters for underlying RPC transport 177 * @ip_addr: callback IP address in presentation format 178 * @authflavor: authentication flavor for underlying RPC transport 179 * 180 * Returns pointer to an NFS client, or an ERR_PTR value. 181 */ 182 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 183 const struct rpc_timeout *timeparms, 184 const char *ip_addr, 185 rpc_authflavor_t authflavour) 186 { 187 char buf[INET6_ADDRSTRLEN + 1]; 188 struct nfs_client *old; 189 int error; 190 191 if (clp->cl_cons_state == NFS_CS_READY) { 192 /* the client is initialised already */ 193 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 194 return clp; 195 } 196 197 /* Check NFS protocol revision and initialize RPC op vector */ 198 clp->rpc_ops = &nfs_v4_clientops; 199 200 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 201 error = nfs_create_rpc_client(clp, timeparms, authflavour); 202 if (error < 0) 203 goto error; 204 205 /* If no clientaddr= option was specified, find a usable cb address */ 206 if (ip_addr == NULL) { 207 struct sockaddr_storage cb_addr; 208 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 209 210 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 211 if (error < 0) 212 goto error; 213 error = rpc_ntop(sap, buf, sizeof(buf)); 214 if (error < 0) 215 goto error; 216 ip_addr = (const char *)buf; 217 } 218 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 219 220 error = nfs_idmap_new(clp); 221 if (error < 0) { 222 dprintk("%s: failed to create idmapper. Error = %d\n", 223 __func__, error); 224 goto error; 225 } 226 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 227 228 error = nfs4_init_client_minor_version(clp); 229 if (error < 0) 230 goto error; 231 232 if (!nfs4_has_session(clp)) 233 nfs_mark_client_ready(clp, NFS_CS_READY); 234 235 error = nfs4_discover_server_trunking(clp, &old); 236 if (error < 0) 237 goto error; 238 if (clp != old) { 239 clp->cl_preserve_clid = true; 240 nfs_put_client(clp); 241 clp = old; 242 atomic_inc(&clp->cl_count); 243 } 244 245 return clp; 246 247 error: 248 nfs_mark_client_ready(clp, error); 249 nfs_put_client(clp); 250 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 251 return ERR_PTR(error); 252 } 253 254 /* 255 * SETCLIENTID just did a callback update with the callback ident in 256 * "drop," but server trunking discovery claims "drop" and "keep" are 257 * actually the same server. Swap the callback IDs so that "keep" 258 * will continue to use the callback ident the server now knows about, 259 * and so that "keep"'s original callback ident is destroyed when 260 * "drop" is freed. 261 */ 262 static void nfs4_swap_callback_idents(struct nfs_client *keep, 263 struct nfs_client *drop) 264 { 265 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 266 unsigned int save = keep->cl_cb_ident; 267 268 if (keep->cl_cb_ident == drop->cl_cb_ident) 269 return; 270 271 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 272 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 273 274 spin_lock(&nn->nfs_client_lock); 275 276 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 277 keep->cl_cb_ident = drop->cl_cb_ident; 278 279 idr_replace(&nn->cb_ident_idr, drop, save); 280 drop->cl_cb_ident = save; 281 282 spin_unlock(&nn->nfs_client_lock); 283 } 284 285 /** 286 * nfs40_walk_client_list - Find server that recognizes a client ID 287 * 288 * @new: nfs_client with client ID to test 289 * @result: OUT: found nfs_client, or new 290 * @cred: credential to use for trunking test 291 * 292 * Returns zero, a negative errno, or a negative NFS4ERR status. 293 * If zero is returned, an nfs_client pointer is planted in "result." 294 * 295 * NB: nfs40_walk_client_list() relies on the new nfs_client being 296 * the last nfs_client on the list. 297 */ 298 int nfs40_walk_client_list(struct nfs_client *new, 299 struct nfs_client **result, 300 struct rpc_cred *cred) 301 { 302 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 303 struct nfs_client *pos, *n, *prev = NULL; 304 struct nfs4_setclientid_res clid = { 305 .clientid = new->cl_clientid, 306 .confirm = new->cl_confirm, 307 }; 308 int status; 309 310 spin_lock(&nn->nfs_client_lock); 311 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) { 312 /* If "pos" isn't marked ready, we can't trust the 313 * remaining fields in "pos" */ 314 if (pos->cl_cons_state < NFS_CS_READY) 315 continue; 316 317 if (pos->rpc_ops != new->rpc_ops) 318 continue; 319 320 if (pos->cl_proto != new->cl_proto) 321 continue; 322 323 if (pos->cl_minorversion != new->cl_minorversion) 324 continue; 325 326 if (pos->cl_clientid != new->cl_clientid) 327 continue; 328 329 atomic_inc(&pos->cl_count); 330 spin_unlock(&nn->nfs_client_lock); 331 332 if (prev) 333 nfs_put_client(prev); 334 335 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 336 if (status == 0) { 337 nfs4_swap_callback_idents(pos, new); 338 339 nfs_put_client(pos); 340 *result = pos; 341 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 342 __func__, pos, atomic_read(&pos->cl_count)); 343 return 0; 344 } 345 if (status != -NFS4ERR_STALE_CLIENTID) { 346 nfs_put_client(pos); 347 dprintk("NFS: <-- %s status = %d, no result\n", 348 __func__, status); 349 return status; 350 } 351 352 spin_lock(&nn->nfs_client_lock); 353 prev = pos; 354 } 355 356 /* 357 * No matching nfs_client found. This should be impossible, 358 * because the new nfs_client has already been added to 359 * nfs_client_list by nfs_get_client(). 360 * 361 * Don't BUG(), since the caller is holding a mutex. 362 */ 363 if (prev) 364 nfs_put_client(prev); 365 spin_unlock(&nn->nfs_client_lock); 366 pr_err("NFS: %s Error: no matching nfs_client found\n", __func__); 367 return -NFS4ERR_STALE_CLIENTID; 368 } 369 370 #ifdef CONFIG_NFS_V4_1 371 /* 372 * Returns true if the client IDs match 373 */ 374 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b) 375 { 376 if (a->cl_clientid != b->cl_clientid) { 377 dprintk("NFS: --> %s client ID %llx does not match %llx\n", 378 __func__, a->cl_clientid, b->cl_clientid); 379 return false; 380 } 381 dprintk("NFS: --> %s client ID %llx matches %llx\n", 382 __func__, a->cl_clientid, b->cl_clientid); 383 return true; 384 } 385 386 /* 387 * Returns true if the server owners match 388 */ 389 static bool 390 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b) 391 { 392 struct nfs41_server_owner *o1 = a->cl_serverowner; 393 struct nfs41_server_owner *o2 = b->cl_serverowner; 394 395 if (o1->minor_id != o2->minor_id) { 396 dprintk("NFS: --> %s server owner minor IDs do not match\n", 397 __func__); 398 return false; 399 } 400 401 if (o1->major_id_sz != o2->major_id_sz) 402 goto out_major_mismatch; 403 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0) 404 goto out_major_mismatch; 405 406 dprintk("NFS: --> %s server owners match\n", __func__); 407 return true; 408 409 out_major_mismatch: 410 dprintk("NFS: --> %s server owner major IDs do not match\n", 411 __func__); 412 return false; 413 } 414 415 /** 416 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 417 * 418 * @new: nfs_client with client ID to test 419 * @result: OUT: found nfs_client, or new 420 * @cred: credential to use for trunking test 421 * 422 * Returns zero, a negative errno, or a negative NFS4ERR status. 423 * If zero is returned, an nfs_client pointer is planted in "result." 424 * 425 * NB: nfs41_walk_client_list() relies on the new nfs_client being 426 * the last nfs_client on the list. 427 */ 428 int nfs41_walk_client_list(struct nfs_client *new, 429 struct nfs_client **result, 430 struct rpc_cred *cred) 431 { 432 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 433 struct nfs_client *pos, *n, *prev = NULL; 434 int error; 435 436 spin_lock(&nn->nfs_client_lock); 437 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) { 438 /* If "pos" isn't marked ready, we can't trust the 439 * remaining fields in "pos", especially the client 440 * ID and serverowner fields. Wait for CREATE_SESSION 441 * to finish. */ 442 if (pos->cl_cons_state < NFS_CS_READY) { 443 atomic_inc(&pos->cl_count); 444 spin_unlock(&nn->nfs_client_lock); 445 446 if (prev) 447 nfs_put_client(prev); 448 prev = pos; 449 450 error = nfs_wait_client_init_complete(pos); 451 if (error < 0) { 452 nfs_put_client(pos); 453 spin_lock(&nn->nfs_client_lock); 454 continue; 455 } 456 457 spin_lock(&nn->nfs_client_lock); 458 } 459 460 if (pos->rpc_ops != new->rpc_ops) 461 continue; 462 463 if (pos->cl_proto != new->cl_proto) 464 continue; 465 466 if (pos->cl_minorversion != new->cl_minorversion) 467 continue; 468 469 if (!nfs4_match_clientids(pos, new)) 470 continue; 471 472 if (!nfs4_match_serverowners(pos, new)) 473 continue; 474 475 spin_unlock(&nn->nfs_client_lock); 476 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 477 __func__, pos, atomic_read(&pos->cl_count)); 478 479 *result = pos; 480 return 0; 481 } 482 483 /* 484 * No matching nfs_client found. This should be impossible, 485 * because the new nfs_client has already been added to 486 * nfs_client_list by nfs_get_client(). 487 * 488 * Don't BUG(), since the caller is holding a mutex. 489 */ 490 spin_unlock(&nn->nfs_client_lock); 491 pr_err("NFS: %s Error: no matching nfs_client found\n", __func__); 492 return -NFS4ERR_STALE_CLIENTID; 493 } 494 #endif /* CONFIG_NFS_V4_1 */ 495 496 static void nfs4_destroy_server(struct nfs_server *server) 497 { 498 nfs_server_return_all_delegations(server); 499 unset_pnfs_layoutdriver(server); 500 nfs4_purge_state_owners(server); 501 } 502 503 /* 504 * NFSv4.0 callback thread helper 505 * 506 * Find a client by callback identifier 507 */ 508 struct nfs_client * 509 nfs4_find_client_ident(struct net *net, int cb_ident) 510 { 511 struct nfs_client *clp; 512 struct nfs_net *nn = net_generic(net, nfs_net_id); 513 514 spin_lock(&nn->nfs_client_lock); 515 clp = idr_find(&nn->cb_ident_idr, cb_ident); 516 if (clp) 517 atomic_inc(&clp->cl_count); 518 spin_unlock(&nn->nfs_client_lock); 519 return clp; 520 } 521 522 #if defined(CONFIG_NFS_V4_1) 523 /* Common match routine for v4.0 and v4.1 callback services */ 524 static bool nfs4_cb_match_client(const struct sockaddr *addr, 525 struct nfs_client *clp, u32 minorversion) 526 { 527 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 528 529 /* Don't match clients that failed to initialise */ 530 if (!(clp->cl_cons_state == NFS_CS_READY || 531 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 532 return false; 533 534 smp_rmb(); 535 536 /* Match the version and minorversion */ 537 if (clp->rpc_ops->version != 4 || 538 clp->cl_minorversion != minorversion) 539 return false; 540 541 /* Match only the IP address, not the port number */ 542 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 543 return false; 544 545 return true; 546 } 547 548 /* 549 * NFSv4.1 callback thread helper 550 * For CB_COMPOUND calls, find a client by IP address, protocol version, 551 * minorversion, and sessionID 552 * 553 * Returns NULL if no such client 554 */ 555 struct nfs_client * 556 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 557 struct nfs4_sessionid *sid) 558 { 559 struct nfs_client *clp; 560 struct nfs_net *nn = net_generic(net, nfs_net_id); 561 562 spin_lock(&nn->nfs_client_lock); 563 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 564 if (nfs4_cb_match_client(addr, clp, 1) == false) 565 continue; 566 567 if (!nfs4_has_session(clp)) 568 continue; 569 570 /* Match sessionid*/ 571 if (memcmp(clp->cl_session->sess_id.data, 572 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 573 continue; 574 575 atomic_inc(&clp->cl_count); 576 spin_unlock(&nn->nfs_client_lock); 577 return clp; 578 } 579 spin_unlock(&nn->nfs_client_lock); 580 return NULL; 581 } 582 583 #else /* CONFIG_NFS_V4_1 */ 584 585 struct nfs_client * 586 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 587 struct nfs4_sessionid *sid) 588 { 589 return NULL; 590 } 591 #endif /* CONFIG_NFS_V4_1 */ 592 593 /* 594 * Set up an NFS4 client 595 */ 596 static int nfs4_set_client(struct nfs_server *server, 597 const char *hostname, 598 const struct sockaddr *addr, 599 const size_t addrlen, 600 const char *ip_addr, 601 rpc_authflavor_t authflavour, 602 int proto, const struct rpc_timeout *timeparms, 603 u32 minorversion, struct net *net) 604 { 605 struct nfs_client_initdata cl_init = { 606 .hostname = hostname, 607 .addr = addr, 608 .addrlen = addrlen, 609 .nfs_mod = &nfs_v4, 610 .proto = proto, 611 .minorversion = minorversion, 612 .net = net, 613 }; 614 struct nfs_client *clp; 615 int error; 616 617 dprintk("--> nfs4_set_client()\n"); 618 619 if (server->flags & NFS_MOUNT_NORESVPORT) 620 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 621 622 /* Allocate or find a client reference we can use */ 623 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour); 624 if (IS_ERR(clp)) { 625 error = PTR_ERR(clp); 626 goto error; 627 } 628 629 /* 630 * Query for the lease time on clientid setup or renewal 631 * 632 * Note that this will be set on nfs_clients that were created 633 * only for the DS role and did not set this bit, but now will 634 * serve a dual role. 635 */ 636 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 637 638 server->nfs_client = clp; 639 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 640 return 0; 641 error: 642 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 643 return error; 644 } 645 646 /* 647 * Set up a pNFS Data Server client. 648 * 649 * Return any existing nfs_client that matches server address,port,version 650 * and minorversion. 651 * 652 * For a new nfs_client, use a soft mount (default), a low retrans and a 653 * low timeout interval so that if a connection is lost, we retry through 654 * the MDS. 655 */ 656 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 657 const struct sockaddr *ds_addr, int ds_addrlen, 658 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans) 659 { 660 struct nfs_client_initdata cl_init = { 661 .addr = ds_addr, 662 .addrlen = ds_addrlen, 663 .nfs_mod = &nfs_v4, 664 .proto = ds_proto, 665 .minorversion = mds_clp->cl_minorversion, 666 .net = mds_clp->cl_net, 667 }; 668 struct rpc_timeout ds_timeout; 669 struct nfs_client *clp; 670 671 /* 672 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 673 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 674 * (section 13.1 RFC 5661). 675 */ 676 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 677 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 678 mds_clp->cl_rpcclient->cl_auth->au_flavor); 679 680 dprintk("<-- %s %p\n", __func__, clp); 681 return clp; 682 } 683 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 684 685 /* 686 * Session has been established, and the client marked ready. 687 * Set the mount rsize and wsize with negotiated fore channel 688 * attributes which will be bound checked in nfs_server_set_fsinfo. 689 */ 690 static void nfs4_session_set_rwsize(struct nfs_server *server) 691 { 692 #ifdef CONFIG_NFS_V4_1 693 struct nfs4_session *sess; 694 u32 server_resp_sz; 695 u32 server_rqst_sz; 696 697 if (!nfs4_has_session(server->nfs_client)) 698 return; 699 sess = server->nfs_client->cl_session; 700 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 701 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 702 703 if (server->rsize > server_resp_sz) 704 server->rsize = server_resp_sz; 705 if (server->wsize > server_rqst_sz) 706 server->wsize = server_rqst_sz; 707 #endif /* CONFIG_NFS_V4_1 */ 708 } 709 710 static int nfs4_server_common_setup(struct nfs_server *server, 711 struct nfs_fh *mntfh) 712 { 713 struct nfs_fattr *fattr; 714 int error; 715 716 BUG_ON(!server->nfs_client); 717 BUG_ON(!server->nfs_client->rpc_ops); 718 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 719 720 /* data servers support only a subset of NFSv4.1 */ 721 if (is_ds_only_client(server->nfs_client)) 722 return -EPROTONOSUPPORT; 723 724 fattr = nfs_alloc_fattr(); 725 if (fattr == NULL) 726 return -ENOMEM; 727 728 /* We must ensure the session is initialised first */ 729 error = nfs4_init_session(server); 730 if (error < 0) 731 goto out; 732 733 /* Probe the root fh to retrieve its FSID and filehandle */ 734 error = nfs4_get_rootfh(server, mntfh); 735 if (error < 0) 736 goto out; 737 738 dprintk("Server FSID: %llx:%llx\n", 739 (unsigned long long) server->fsid.major, 740 (unsigned long long) server->fsid.minor); 741 dprintk("Mount FH: %d\n", mntfh->size); 742 743 nfs4_session_set_rwsize(server); 744 745 error = nfs_probe_fsinfo(server, mntfh, fattr); 746 if (error < 0) 747 goto out; 748 749 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 750 server->namelen = NFS4_MAXNAMLEN; 751 752 nfs_server_insert_lists(server); 753 server->mount_time = jiffies; 754 server->destroy = nfs4_destroy_server; 755 out: 756 nfs_free_fattr(fattr); 757 return error; 758 } 759 760 /* 761 * Create a version 4 volume record 762 */ 763 static int nfs4_init_server(struct nfs_server *server, 764 const struct nfs_parsed_mount_data *data) 765 { 766 struct rpc_timeout timeparms; 767 int error; 768 769 dprintk("--> nfs4_init_server()\n"); 770 771 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 772 data->timeo, data->retrans); 773 774 /* Initialise the client representation from the mount data */ 775 server->flags = data->flags; 776 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 777 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 778 server->caps |= NFS_CAP_READDIRPLUS; 779 server->options = data->options; 780 781 /* Get a client record */ 782 error = nfs4_set_client(server, 783 data->nfs_server.hostname, 784 (const struct sockaddr *)&data->nfs_server.address, 785 data->nfs_server.addrlen, 786 data->client_address, 787 data->auth_flavors[0], 788 data->nfs_server.protocol, 789 &timeparms, 790 data->minorversion, 791 data->net); 792 if (error < 0) 793 goto error; 794 795 /* 796 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 797 * authentication. 798 */ 799 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) 800 server->caps |= NFS_CAP_UIDGID_NOMAP; 801 802 if (data->rsize) 803 server->rsize = nfs_block_size(data->rsize, NULL); 804 if (data->wsize) 805 server->wsize = nfs_block_size(data->wsize, NULL); 806 807 server->acregmin = data->acregmin * HZ; 808 server->acregmax = data->acregmax * HZ; 809 server->acdirmin = data->acdirmin * HZ; 810 server->acdirmax = data->acdirmax * HZ; 811 812 server->port = data->nfs_server.port; 813 814 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 815 816 error: 817 /* Done */ 818 dprintk("<-- nfs4_init_server() = %d\n", error); 819 return error; 820 } 821 822 /* 823 * Create a version 4 volume record 824 * - keyed on server and FSID 825 */ 826 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 827 struct nfs_fh *mntfh)*/ 828 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, 829 struct nfs_subversion *nfs_mod) 830 { 831 struct nfs_server *server; 832 int error; 833 834 dprintk("--> nfs4_create_server()\n"); 835 836 server = nfs_alloc_server(); 837 if (!server) 838 return ERR_PTR(-ENOMEM); 839 840 /* set up the general RPC client */ 841 error = nfs4_init_server(server, mount_info->parsed); 842 if (error < 0) 843 goto error; 844 845 error = nfs4_server_common_setup(server, mount_info->mntfh); 846 if (error < 0) 847 goto error; 848 849 dprintk("<-- nfs4_create_server() = %p\n", server); 850 return server; 851 852 error: 853 nfs_free_server(server); 854 dprintk("<-- nfs4_create_server() = error %d\n", error); 855 return ERR_PTR(error); 856 } 857 858 /* 859 * Create an NFS4 referral server record 860 */ 861 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 862 struct nfs_fh *mntfh) 863 { 864 struct nfs_client *parent_client; 865 struct nfs_server *server, *parent_server; 866 int error; 867 868 dprintk("--> nfs4_create_referral_server()\n"); 869 870 server = nfs_alloc_server(); 871 if (!server) 872 return ERR_PTR(-ENOMEM); 873 874 parent_server = NFS_SB(data->sb); 875 parent_client = parent_server->nfs_client; 876 877 /* Initialise the client representation from the parent server */ 878 nfs_server_copy_userdata(server, parent_server); 879 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 880 881 /* Get a client representation. 882 * Note: NFSv4 always uses TCP, */ 883 error = nfs4_set_client(server, data->hostname, 884 data->addr, 885 data->addrlen, 886 parent_client->cl_ipaddr, 887 data->authflavor, 888 rpc_protocol(parent_server->client), 889 parent_server->client->cl_timeout, 890 parent_client->cl_mvops->minor_version, 891 parent_client->cl_net); 892 if (error < 0) 893 goto error; 894 895 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 896 if (error < 0) 897 goto error; 898 899 error = nfs4_server_common_setup(server, mntfh); 900 if (error < 0) 901 goto error; 902 903 dprintk("<-- nfs_create_referral_server() = %p\n", server); 904 return server; 905 906 error: 907 nfs_free_server(server); 908 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 909 return ERR_PTR(error); 910 } 911