fs/nfs/nfs4client.c

   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/addr.h>
  10 #include <linux/sunrpc/auth.h>
  11 #include <linux/sunrpc/xprt.h>
  12 #include <linux/sunrpc/bc_xprt.h>
  13 #include "internal.h"
  14 #include "callback.h"
  15 #include "delegation.h"
  16 #include "nfs4session.h"
  17 #include "pnfs.h"
  18 #include "netns.h"
  19
  20 #define NFSDBG_FACILITY         NFSDBG_CLIENT
  21
  22 /*
  23  * Get a unique NFSv4.0 callback identifier which will be used
  24  * by the V4.0 callback service to lookup the nfs_client struct
  25  */
  26 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  27 {
  28         int ret = 0;
  29         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  30
  31         if (clp->rpc_ops->version != 4 || minorversion != 0)
  32                 return ret;
  33         idr_preload(GFP_KERNEL);
  34         spin_lock(&nn->nfs_client_lock);
  35         ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
  36         if (ret >= 0)
  37                 clp->cl_cb_ident = ret;
  38         spin_unlock(&nn->nfs_client_lock);
  39         idr_preload_end();
  40         return ret < 0 ? ret : 0;
  41 }
  42
  43 #ifdef CONFIG_NFS_V4_1
  44 static void nfs4_shutdown_session(struct nfs_client *clp)
  45 {
  46         if (nfs4_has_session(clp)) {
  47                 nfs4_destroy_session(clp->cl_session);
  48                 nfs4_destroy_clientid(clp);
  49         }
  50
  51 }
  52 #else /* CONFIG_NFS_V4_1 */
  53 static void nfs4_shutdown_session(struct nfs_client *clp)
  54 {
  55 }
  56 #endif /* CONFIG_NFS_V4_1 */
  57
  58 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
  59 {
  60         int err;
  61         struct nfs_client *clp = nfs_alloc_client(cl_init);
  62         if (IS_ERR(clp))
  63                 return clp;
  64
  65         err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
  66         if (err)
  67                 goto error;
  68
  69         if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
  70                 err = -EINVAL;
  71                 goto error;
  72         }
  73
  74         spin_lock_init(&clp->cl_lock);
  75         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
  76         rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
  77         clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
  78         clp->cl_minorversion = cl_init->minorversion;
  79         clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
  80         return clp;
  81
  82 error:
  83         nfs_free_client(clp);
  84         return ERR_PTR(err);
  85 }
  86
  87 /*
  88  * Destroy the NFS4 callback service
  89  */
  90 static void nfs4_destroy_callback(struct nfs_client *clp)
  91 {
  92         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
  93                 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
  94 }
  95
  96 static void nfs4_shutdown_client(struct nfs_client *clp)
  97 {
  98         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
  99                 nfs4_kill_renewd(clp);
 100         nfs4_shutdown_session(clp);
 101         nfs4_destroy_callback(clp);
 102         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
 103                 nfs_idmap_delete(clp);
 104
 105         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 106         kfree(clp->cl_serverowner);
 107         kfree(clp->cl_serverscope);
 108         kfree(clp->cl_implid);
 109 }
 110
 111 void nfs4_free_client(struct nfs_client *clp)
 112 {
 113         nfs4_shutdown_client(clp);
 114         nfs_free_client(clp);
 115 }
 116
 117 /*
 118  * Initialize the NFS4 callback service
 119  */
 120 static int nfs4_init_callback(struct nfs_client *clp)
 121 {
 122         int error;
 123
 124         if (clp->rpc_ops->version == 4) {
 125                 struct rpc_xprt *xprt;
 126
 127                 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 128
 129                 if (nfs4_has_session(clp)) {
 130                         error = xprt_setup_backchannel(xprt,
 131                                                 NFS41_BC_MIN_CALLBACKS);
 132                         if (error < 0)
 133                                 return error;
 134                 }
 135
 136                 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 137                 if (error < 0) {
 138                         dprintk("%s: failed to start callback. Error = %d\n",
 139                                 __func__, error);
 140                         return error;
 141                 }
 142                 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 143         }
 144         return 0;
 145 }
 146
 147 /*
 148  * Initialize the minor version specific parts of an NFS4 client record
 149  */
 150 static int nfs4_init_client_minor_version(struct nfs_client *clp)
 151 {
 152 #if defined(CONFIG_NFS_V4_1)
 153         if (clp->cl_mvops->minor_version) {
 154                 struct nfs4_session *session = NULL;
 155                 /*
 156                  * Create the session and mark it expired.
 157                  * When a SEQUENCE operation encounters the expired session
 158                  * it will do session recovery to initialize it.
 159                  */
 160                 session = nfs4_alloc_session(clp);
 161                 if (!session)
 162                         return -ENOMEM;
 163
 164                 clp->cl_session = session;
 165                 /*
 166                  * The create session reply races with the server back
 167                  * channel probe. Mark the client NFS_CS_SESSION_INITING
 168                  * so that the client back channel can find the
 169                  * nfs_client struct
 170                  */
 171                 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 172         }
 173 #endif /* CONFIG_NFS_V4_1 */
 174
 175         return nfs4_init_callback(clp);
 176 }
 177
 178 /**
 179  * nfs4_init_client - Initialise an NFS4 client record
 180  *
 181  * @clp: nfs_client to initialise
 182  * @timeparms: timeout parameters for underlying RPC transport
 183  * @ip_addr: callback IP address in presentation format
 184  * @authflavor: authentication flavor for underlying RPC transport
 185  *
 186  * Returns pointer to an NFS client, or an ERR_PTR value.
 187  */
 188 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 189                                     const struct rpc_timeout *timeparms,
 190                                     const char *ip_addr,
 191                                     rpc_authflavor_t authflavour)
 192 {
 193         char buf[INET6_ADDRSTRLEN + 1];
 194         struct nfs_client *old;
 195         int error;
 196
 197         if (clp->cl_cons_state == NFS_CS_READY) {
 198                 /* the client is initialised already */
 199                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 200                 return clp;
 201         }
 202
 203         /* Check NFS protocol revision and initialize RPC op vector */
 204         clp->rpc_ops = &nfs_v4_clientops;
 205
 206         if (clp->cl_minorversion != 0)
 207                 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 208         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 209         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
 210         if (error == -EINVAL)
 211                 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
 212         if (error < 0)
 213                 goto error;
 214
 215         /* If no clientaddr= option was specified, find a usable cb address */
 216         if (ip_addr == NULL) {
 217                 struct sockaddr_storage cb_addr;
 218                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 219
 220                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 221                 if (error < 0)
 222                         goto error;
 223                 error = rpc_ntop(sap, buf, sizeof(buf));
 224                 if (error < 0)
 225                         goto error;
 226                 ip_addr = (const char *)buf;
 227         }
 228         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 229
 230         error = nfs_idmap_new(clp);
 231         if (error < 0) {
 232                 dprintk("%s: failed to create idmapper. Error = %d\n",
 233                         __func__, error);
 234                 goto error;
 235         }
 236         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 237
 238         error = nfs4_init_client_minor_version(clp);
 239         if (error < 0)
 240                 goto error;
 241
 242         if (!nfs4_has_session(clp))
 243                 nfs_mark_client_ready(clp, NFS_CS_READY);
 244
 245         error = nfs4_discover_server_trunking(clp, &old);
 246         if (error < 0)
 247                 goto error;
 248         nfs_put_client(clp);
 249         if (clp != old) {
 250                 clp->cl_preserve_clid = true;
 251                 clp = old;
 252         }
 253
 254         return clp;
 255
 256 error:
 257         nfs_mark_client_ready(clp, error);
 258         nfs_put_client(clp);
 259         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
 260         return ERR_PTR(error);
 261 }
 262
 263 /*
 264  * SETCLIENTID just did a callback update with the callback ident in
 265  * "drop," but server trunking discovery claims "drop" and "keep" are
 266  * actually the same server.  Swap the callback IDs so that "keep"
 267  * will continue to use the callback ident the server now knows about,
 268  * and so that "keep"'s original callback ident is destroyed when
 269  * "drop" is freed.
 270  */
 271 static void nfs4_swap_callback_idents(struct nfs_client *keep,
 272                                       struct nfs_client *drop)
 273 {
 274         struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 275         unsigned int save = keep->cl_cb_ident;
 276
 277         if (keep->cl_cb_ident == drop->cl_cb_ident)
 278                 return;
 279
 280         dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 281                 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
 282
 283         spin_lock(&nn->nfs_client_lock);
 284
 285         idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 286         keep->cl_cb_ident = drop->cl_cb_ident;
 287
 288         idr_replace(&nn->cb_ident_idr, drop, save);
 289         drop->cl_cb_ident = save;
 290
 291         spin_unlock(&nn->nfs_client_lock);
 292 }
 293
 294 /**
 295  * nfs40_walk_client_list - Find server that recognizes a client ID
 296  *
 297  * @new: nfs_client with client ID to test
 298  * @result: OUT: found nfs_client, or new
 299  * @cred: credential to use for trunking test
 300  *
 301  * Returns zero, a negative errno, or a negative NFS4ERR status.
 302  * If zero is returned, an nfs_client pointer is planted in "result."
 303  *
 304  * NB: nfs40_walk_client_list() relies on the new nfs_client being
 305  *     the last nfs_client on the list.
 306  */
 307 int nfs40_walk_client_list(struct nfs_client *new,
 308                            struct nfs_client **result,
 309                            struct rpc_cred *cred)
 310 {
 311         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 312         struct nfs_client *pos, *prev = NULL;
 313         struct nfs4_setclientid_res clid = {
 314                 .clientid       = new->cl_clientid,
 315                 .confirm        = new->cl_confirm,
 316         };
 317         int status = -NFS4ERR_STALE_CLIENTID;
 318
 319         spin_lock(&nn->nfs_client_lock);
 320         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 321                 /* If "pos" isn't marked ready, we can't trust the
 322                  * remaining fields in "pos" */
 323                 if (pos->cl_cons_state > NFS_CS_READY) {
 324                         atomic_inc(&pos->cl_count);
 325                         spin_unlock(&nn->nfs_client_lock);
 326
 327                         if (prev)
 328                                 nfs_put_client(prev);
 329                         prev = pos;
 330
 331                         status = nfs_wait_client_init_complete(pos);
 332                         spin_lock(&nn->nfs_client_lock);
 333                         if (status < 0)
 334                                 continue;
 335                 }
 336                 if (pos->cl_cons_state != NFS_CS_READY)
 337                         continue;
 338
 339                 if (pos->rpc_ops != new->rpc_ops)
 340                         continue;
 341
 342                 if (pos->cl_proto != new->cl_proto)
 343                         continue;
 344
 345                 if (pos->cl_minorversion != new->cl_minorversion)
 346                         continue;
 347
 348                 if (pos->cl_clientid != new->cl_clientid)
 349                         continue;
 350
 351                 atomic_inc(&pos->cl_count);
 352                 spin_unlock(&nn->nfs_client_lock);
 353
 354                 if (prev)
 355                         nfs_put_client(prev);
 356                 prev = pos;
 357
 358                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 359                 switch (status) {
 360                 case -NFS4ERR_STALE_CLIENTID:
 361                         break;
 362                 case 0:
 363                         nfs4_swap_callback_idents(pos, new);
 364
 365                         prev = NULL;
 366                         *result = pos;
 367                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 368                                 __func__, pos, atomic_read(&pos->cl_count));
 369                 default:
 370                         goto out;
 371                 }
 372
 373                 spin_lock(&nn->nfs_client_lock);
 374         }
 375         spin_unlock(&nn->nfs_client_lock);
 376
 377         /* No match found. The server lost our clientid */
 378 out:
 379         if (prev)
 380                 nfs_put_client(prev);
 381         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 382         return status;
 383 }
 384
 385 #ifdef CONFIG_NFS_V4_1
 386 /*
 387  * Returns true if the client IDs match
 388  */
 389 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 390 {
 391         if (a->cl_clientid != b->cl_clientid) {
 392                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 393                         __func__, a->cl_clientid, b->cl_clientid);
 394                 return false;
 395         }
 396         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 397                 __func__, a->cl_clientid, b->cl_clientid);
 398         return true;
 399 }
 400
 401 /*
 402  * Returns true if the server owners match
 403  */
 404 static bool
 405 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 406 {
 407         struct nfs41_server_owner *o1 = a->cl_serverowner;
 408         struct nfs41_server_owner *o2 = b->cl_serverowner;
 409
 410         if (o1->minor_id != o2->minor_id) {
 411                 dprintk("NFS: --> %s server owner minor IDs do not match\n",
 412                         __func__);
 413                 return false;
 414         }
 415
 416         if (o1->major_id_sz != o2->major_id_sz)
 417                 goto out_major_mismatch;
 418         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 419                 goto out_major_mismatch;
 420
 421         dprintk("NFS: --> %s server owners match\n", __func__);
 422         return true;
 423
 424 out_major_mismatch:
 425         dprintk("NFS: --> %s server owner major IDs do not match\n",
 426                 __func__);
 427         return false;
 428 }
 429
 430 /**
 431  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 432  *
 433  * @new: nfs_client with client ID to test
 434  * @result: OUT: found nfs_client, or new
 435  * @cred: credential to use for trunking test
 436  *
 437  * Returns zero, a negative errno, or a negative NFS4ERR status.
 438  * If zero is returned, an nfs_client pointer is planted in "result."
 439  *
 440  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 441  *     the last nfs_client on the list.
 442  */
 443 int nfs41_walk_client_list(struct nfs_client *new,
 444                            struct nfs_client **result,
 445                            struct rpc_cred *cred)
 446 {
 447         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 448         struct nfs_client *pos, *prev = NULL;
 449         int status = -NFS4ERR_STALE_CLIENTID;
 450
 451         spin_lock(&nn->nfs_client_lock);
 452         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 453                 /* If "pos" isn't marked ready, we can't trust the
 454                  * remaining fields in "pos", especially the client
 455                  * ID and serverowner fields.  Wait for CREATE_SESSION
 456                  * to finish. */
 457                 if (pos->cl_cons_state > NFS_CS_READY) {
 458                         atomic_inc(&pos->cl_count);
 459                         spin_unlock(&nn->nfs_client_lock);
 460
 461                         if (prev)
 462                                 nfs_put_client(prev);
 463                         prev = pos;
 464
 465                         status = nfs_wait_client_init_complete(pos);
 466                         if (status == 0) {
 467                                 nfs4_schedule_lease_recovery(pos);
 468                                 status = nfs4_wait_clnt_recover(pos);
 469                         }
 470                         spin_lock(&nn->nfs_client_lock);
 471                         if (status < 0)
 472                                 continue;
 473                 }
 474                 if (pos->cl_cons_state != NFS_CS_READY)
 475                         continue;
 476
 477                 if (pos->rpc_ops != new->rpc_ops)
 478                         continue;
 479
 480                 if (pos->cl_proto != new->cl_proto)
 481                         continue;
 482
 483                 if (pos->cl_minorversion != new->cl_minorversion)
 484                         continue;
 485
 486                 if (!nfs4_match_clientids(pos, new))
 487                         continue;
 488
 489                 if (!nfs4_match_serverowners(pos, new))
 490                         continue;
 491
 492                 atomic_inc(&pos->cl_count);
 493                 *result = pos;
 494                 status = 0;
 495                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 496                         __func__, pos, atomic_read(&pos->cl_count));
 497                 break;
 498         }
 499
 500         /* No matching nfs_client found. */
 501         spin_unlock(&nn->nfs_client_lock);
 502         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 503         if (prev)
 504                 nfs_put_client(prev);
 505         return status;
 506 }
 507 #endif  /* CONFIG_NFS_V4_1 */
 508
 509 static void nfs4_destroy_server(struct nfs_server *server)
 510 {
 511         nfs_server_return_all_delegations(server);
 512         unset_pnfs_layoutdriver(server);
 513         nfs4_purge_state_owners(server);
 514 }
 515
 516 /*
 517  * NFSv4.0 callback thread helper
 518  *
 519  * Find a client by callback identifier
 520  */
 521 struct nfs_client *
 522 nfs4_find_client_ident(struct net *net, int cb_ident)
 523 {
 524         struct nfs_client *clp;
 525         struct nfs_net *nn = net_generic(net, nfs_net_id);
 526
 527         spin_lock(&nn->nfs_client_lock);
 528         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 529         if (clp)
 530                 atomic_inc(&clp->cl_count);
 531         spin_unlock(&nn->nfs_client_lock);
 532         return clp;
 533 }
 534
 535 #if defined(CONFIG_NFS_V4_1)
 536 /* Common match routine for v4.0 and v4.1 callback services */
 537 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 538                 struct nfs_client *clp, u32 minorversion)
 539 {
 540         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 541
 542         /* Don't match clients that failed to initialise */
 543         if (!(clp->cl_cons_state == NFS_CS_READY ||
 544             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 545                 return false;
 546
 547         smp_rmb();
 548
 549         /* Match the version and minorversion */
 550         if (clp->rpc_ops->version != 4 ||
 551             clp->cl_minorversion != minorversion)
 552                 return false;
 553
 554         /* Match only the IP address, not the port number */
 555         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 556                 return false;
 557
 558         return true;
 559 }
 560
 561 /*
 562  * NFSv4.1 callback thread helper
 563  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 564  * minorversion, and sessionID
 565  *
 566  * Returns NULL if no such client
 567  */
 568 struct nfs_client *
 569 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 570                            struct nfs4_sessionid *sid, u32 minorversion)
 571 {
 572         struct nfs_client *clp;
 573         struct nfs_net *nn = net_generic(net, nfs_net_id);
 574
 575         spin_lock(&nn->nfs_client_lock);
 576         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 577                 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
 578                         continue;
 579
 580                 if (!nfs4_has_session(clp))
 581                         continue;
 582
 583                 /* Match sessionid*/
 584                 if (memcmp(clp->cl_session->sess_id.data,
 585                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 586                         continue;
 587
 588                 atomic_inc(&clp->cl_count);
 589                 spin_unlock(&nn->nfs_client_lock);
 590                 return clp;
 591         }
 592         spin_unlock(&nn->nfs_client_lock);
 593         return NULL;
 594 }
 595
 596 #else /* CONFIG_NFS_V4_1 */
 597
 598 struct nfs_client *
 599 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 600                            struct nfs4_sessionid *sid, u32 minorversion)
 601 {
 602         return NULL;
 603 }
 604 #endif /* CONFIG_NFS_V4_1 */
 605
 606 /*
 607  * Set up an NFS4 client
 608  */
 609 static int nfs4_set_client(struct nfs_server *server,
 610                 const char *hostname,
 611                 const struct sockaddr *addr,
 612                 const size_t addrlen,
 613                 const char *ip_addr,
 614                 rpc_authflavor_t authflavour,
 615                 int proto, const struct rpc_timeout *timeparms,
 616                 u32 minorversion, struct net *net)
 617 {
 618         struct nfs_client_initdata cl_init = {
 619                 .hostname = hostname,
 620                 .addr = addr,
 621                 .addrlen = addrlen,
 622                 .nfs_mod = &nfs_v4,
 623                 .proto = proto,
 624                 .minorversion = minorversion,
 625                 .net = net,
 626         };
 627         struct nfs_client *clp;
 628         int error;
 629
 630         dprintk("--> nfs4_set_client()\n");
 631
 632         if (server->flags & NFS_MOUNT_NORESVPORT)
 633                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 634         if (server->options & NFS_OPTION_MIGRATION)
 635                 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
 636
 637         /* Allocate or find a client reference we can use */
 638         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 639         if (IS_ERR(clp)) {
 640                 error = PTR_ERR(clp);
 641                 goto error;
 642         }
 643
 644         /*
 645          * Query for the lease time on clientid setup or renewal
 646          *
 647          * Note that this will be set on nfs_clients that were created
 648          * only for the DS role and did not set this bit, but now will
 649          * serve a dual role.
 650          */
 651         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 652
 653         server->nfs_client = clp;
 654         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 655         return 0;
 656 error:
 657         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 658         return error;
 659 }
 660
 661 /*
 662  * Set up a pNFS Data Server client.
 663  *
 664  * Return any existing nfs_client that matches server address,port,version
 665  * and minorversion.
 666  *
 667  * For a new nfs_client, use a soft mount (default), a low retrans and a
 668  * low timeout interval so that if a connection is lost, we retry through
 669  * the MDS.
 670  */
 671 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 672                 const struct sockaddr *ds_addr, int ds_addrlen,
 673                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 674 {
 675         struct nfs_client_initdata cl_init = {
 676                 .addr = ds_addr,
 677                 .addrlen = ds_addrlen,
 678                 .nfs_mod = &nfs_v4,
 679                 .proto = ds_proto,
 680                 .minorversion = mds_clp->cl_minorversion,
 681                 .net = mds_clp->cl_net,
 682         };
 683         struct rpc_timeout ds_timeout;
 684         struct nfs_client *clp;
 685
 686         /*
 687          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 688          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 689          * (section 13.1 RFC 5661).
 690          */
 691         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 692         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 693                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 694
 695         dprintk("<-- %s %p\n", __func__, clp);
 696         return clp;
 697 }
 698 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 699
 700 /*
 701  * Session has been established, and the client marked ready.
 702  * Set the mount rsize and wsize with negotiated fore channel
 703  * attributes which will be bound checked in nfs_server_set_fsinfo.
 704  */
 705 static void nfs4_session_set_rwsize(struct nfs_server *server)
 706 {
 707 #ifdef CONFIG_NFS_V4_1
 708         struct nfs4_session *sess;
 709         u32 server_resp_sz;
 710         u32 server_rqst_sz;
 711
 712         if (!nfs4_has_session(server->nfs_client))
 713                 return;
 714         sess = server->nfs_client->cl_session;
 715         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 716         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 717
 718         if (server->rsize > server_resp_sz)
 719                 server->rsize = server_resp_sz;
 720         if (server->wsize > server_rqst_sz)
 721                 server->wsize = server_rqst_sz;
 722 #endif /* CONFIG_NFS_V4_1 */
 723 }
 724
 725 static int nfs4_server_common_setup(struct nfs_server *server,
 726                 struct nfs_fh *mntfh)
 727 {
 728         struct nfs_fattr *fattr;
 729         int error;
 730
 731         /* data servers support only a subset of NFSv4.1 */
 732         if (is_ds_only_client(server->nfs_client))
 733                 return -EPROTONOSUPPORT;
 734
 735         fattr = nfs_alloc_fattr();
 736         if (fattr == NULL)
 737                 return -ENOMEM;
 738
 739         /* We must ensure the session is initialised first */
 740         error = nfs4_init_session(server->nfs_client);
 741         if (error < 0)
 742                 goto out;
 743
 744         /* Set the basic capabilities */
 745         server->caps |= server->nfs_client->cl_mvops->init_caps;
 746         if (server->flags & NFS_MOUNT_NORDIRPLUS)
 747                         server->caps &= ~NFS_CAP_READDIRPLUS;
 748         /*
 749          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 750          * authentication.
 751          */
 752         if (nfs4_disable_idmapping &&
 753                         server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
 754                 server->caps |= NFS_CAP_UIDGID_NOMAP;
 755
 756
 757         /* Probe the root fh to retrieve its FSID and filehandle */
 758         error = nfs4_get_rootfh(server, mntfh);
 759         if (error < 0)
 760                 goto out;
 761
 762         dprintk("Server FSID: %llx:%llx\n",
 763                         (unsigned long long) server->fsid.major,
 764                         (unsigned long long) server->fsid.minor);
 765         dprintk("Mount FH: %d\n", mntfh->size);
 766
 767         nfs4_session_set_rwsize(server);
 768
 769         error = nfs_probe_fsinfo(server, mntfh, fattr);
 770         if (error < 0)
 771                 goto out;
 772
 773         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 774                 server->namelen = NFS4_MAXNAMLEN;
 775
 776         nfs_server_insert_lists(server);
 777         server->mount_time = jiffies;
 778         server->destroy = nfs4_destroy_server;
 779 out:
 780         nfs_free_fattr(fattr);
 781         return error;
 782 }
 783
 784 /*
 785  * Create a version 4 volume record
 786  */
 787 static int nfs4_init_server(struct nfs_server *server,
 788                 const struct nfs_parsed_mount_data *data)
 789 {
 790         struct rpc_timeout timeparms;
 791         int error;
 792
 793         dprintk("--> nfs4_init_server()\n");
 794
 795         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 796                         data->timeo, data->retrans);
 797
 798         /* Initialise the client representation from the mount data */
 799         server->flags = data->flags;
 800         server->options = data->options;
 801
 802         /* Get a client record */
 803         error = nfs4_set_client(server,
 804                         data->nfs_server.hostname,
 805                         (const struct sockaddr *)&data->nfs_server.address,
 806                         data->nfs_server.addrlen,
 807                         data->client_address,
 808                         data->auth_flavors[0],
 809                         data->nfs_server.protocol,
 810                         &timeparms,
 811                         data->minorversion,
 812                         data->net);
 813         if (error < 0)
 814                 goto error;
 815
 816         if (data->rsize)
 817                 server->rsize = nfs_block_size(data->rsize, NULL);
 818         if (data->wsize)
 819                 server->wsize = nfs_block_size(data->wsize, NULL);
 820
 821         server->acregmin = data->acregmin * HZ;
 822         server->acregmax = data->acregmax * HZ;
 823         server->acdirmin = data->acdirmin * HZ;
 824         server->acdirmax = data->acdirmax * HZ;
 825
 826         server->port = data->nfs_server.port;
 827
 828         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 829
 830 error:
 831         /* Done */
 832         dprintk("<-- nfs4_init_server() = %d\n", error);
 833         return error;
 834 }
 835
 836 /*
 837  * Create a version 4 volume record
 838  * - keyed on server and FSID
 839  */
 840 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
 841                                       struct nfs_fh *mntfh)*/
 842 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
 843                                       struct nfs_subversion *nfs_mod)
 844 {
 845         struct nfs_server *server;
 846         int error;
 847
 848         dprintk("--> nfs4_create_server()\n");
 849
 850         server = nfs_alloc_server();
 851         if (!server)
 852                 return ERR_PTR(-ENOMEM);
 853
 854         /* set up the general RPC client */
 855         error = nfs4_init_server(server, mount_info->parsed);
 856         if (error < 0)
 857                 goto error;
 858
 859         error = nfs4_server_common_setup(server, mount_info->mntfh);
 860         if (error < 0)
 861                 goto error;
 862
 863         dprintk("<-- nfs4_create_server() = %p\n", server);
 864         return server;
 865
 866 error:
 867         nfs_free_server(server);
 868         dprintk("<-- nfs4_create_server() = error %d\n", error);
 869         return ERR_PTR(error);
 870 }
 871
 872 /*
 873  * Create an NFS4 referral server record
 874  */
 875 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
 876                                                struct nfs_fh *mntfh)
 877 {
 878         struct nfs_client *parent_client;
 879         struct nfs_server *server, *parent_server;
 880         int error;
 881
 882         dprintk("--> nfs4_create_referral_server()\n");
 883
 884         server = nfs_alloc_server();
 885         if (!server)
 886                 return ERR_PTR(-ENOMEM);
 887
 888         parent_server = NFS_SB(data->sb);
 889         parent_client = parent_server->nfs_client;
 890
 891         /* Initialise the client representation from the parent server */
 892         nfs_server_copy_userdata(server, parent_server);
 893
 894         /* Get a client representation.
 895          * Note: NFSv4 always uses TCP, */
 896         error = nfs4_set_client(server, data->hostname,
 897                                 data->addr,
 898                                 data->addrlen,
 899                                 parent_client->cl_ipaddr,
 900                                 data->authflavor,
 901                                 rpc_protocol(parent_server->client),
 902                                 parent_server->client->cl_timeout,
 903                                 parent_client->cl_mvops->minor_version,
 904                                 parent_client->cl_net);
 905         if (error < 0)
 906                 goto error;
 907
 908         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
 909         if (error < 0)
 910                 goto error;
 911
 912         error = nfs4_server_common_setup(server, mntfh);
 913         if (error < 0)
 914                 goto error;
 915
 916         dprintk("<-- nfs_create_referral_server() = %p\n", server);
 917         return server;
 918
 919 error:
 920         nfs_free_server(server);
 921         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
 922         return ERR_PTR(error);
 923 }