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         spin_lock_init(&clp->cl_lock);
  70         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
  71         rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
  72         clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
  73         clp->cl_minorversion = cl_init->minorversion;
  74         clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
  75         return clp;
  76
  77 error:
  78         nfs_free_client(clp);
  79         return ERR_PTR(err);
  80 }
  81
  82 /*
  83  * Destroy the NFS4 callback service
  84  */
  85 static void nfs4_destroy_callback(struct nfs_client *clp)
  86 {
  87         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
  88                 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
  89 }
  90
  91 static void nfs4_shutdown_client(struct nfs_client *clp)
  92 {
  93         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
  94                 nfs4_kill_renewd(clp);
  95         nfs4_shutdown_session(clp);
  96         nfs4_destroy_callback(clp);
  97         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
  98                 nfs_idmap_delete(clp);
  99
 100         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 101         kfree(clp->cl_serverowner);
 102         kfree(clp->cl_serverscope);
 103         kfree(clp->cl_implid);
 104 }
 105
 106 void nfs4_free_client(struct nfs_client *clp)
 107 {
 108         nfs4_shutdown_client(clp);
 109         nfs_free_client(clp);
 110 }
 111
 112 /*
 113  * Initialize the NFS4 callback service
 114  */
 115 static int nfs4_init_callback(struct nfs_client *clp)
 116 {
 117         int error;
 118
 119         if (clp->rpc_ops->version == 4) {
 120                 struct rpc_xprt *xprt;
 121
 122                 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 123
 124                 if (nfs4_has_session(clp)) {
 125                         error = xprt_setup_backchannel(xprt,
 126                                                 NFS41_BC_MIN_CALLBACKS);
 127                         if (error < 0)
 128                                 return error;
 129                 }
 130
 131                 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 132                 if (error < 0) {
 133                         dprintk("%s: failed to start callback. Error = %d\n",
 134                                 __func__, error);
 135                         return error;
 136                 }
 137                 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 138         }
 139         return 0;
 140 }
 141
 142 /*
 143  * Initialize the minor version specific parts of an NFS4 client record
 144  */
 145 static int nfs4_init_client_minor_version(struct nfs_client *clp)
 146 {
 147 #if defined(CONFIG_NFS_V4_1)
 148         if (clp->cl_mvops->minor_version) {
 149                 struct nfs4_session *session = NULL;
 150                 /*
 151                  * Create the session and mark it expired.
 152                  * When a SEQUENCE operation encounters the expired session
 153                  * it will do session recovery to initialize it.
 154                  */
 155                 session = nfs4_alloc_session(clp);
 156                 if (!session)
 157                         return -ENOMEM;
 158
 159                 clp->cl_session = session;
 160                 /*
 161                  * The create session reply races with the server back
 162                  * channel probe. Mark the client NFS_CS_SESSION_INITING
 163                  * so that the client back channel can find the
 164                  * nfs_client struct
 165                  */
 166                 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 167         }
 168 #endif /* CONFIG_NFS_V4_1 */
 169
 170         return nfs4_init_callback(clp);
 171 }
 172
 173 /**
 174  * nfs4_init_client - Initialise an NFS4 client record
 175  *
 176  * @clp: nfs_client to initialise
 177  * @timeparms: timeout parameters for underlying RPC transport
 178  * @ip_addr: callback IP address in presentation format
 179  * @authflavor: authentication flavor for underlying RPC transport
 180  *
 181  * Returns pointer to an NFS client, or an ERR_PTR value.
 182  */
 183 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 184                                     const struct rpc_timeout *timeparms,
 185                                     const char *ip_addr,
 186                                     rpc_authflavor_t authflavour)
 187 {
 188         char buf[INET6_ADDRSTRLEN + 1];
 189         struct nfs_client *old;
 190         int error;
 191
 192         if (clp->cl_cons_state == NFS_CS_READY) {
 193                 /* the client is initialised already */
 194                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 195                 return clp;
 196         }
 197
 198         /* Check NFS protocol revision and initialize RPC op vector */
 199         clp->rpc_ops = &nfs_v4_clientops;
 200
 201         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 202         error = nfs_create_rpc_client(clp, timeparms, authflavour);
 203         if (error < 0)
 204                 goto error;
 205
 206         /* If no clientaddr= option was specified, find a usable cb address */
 207         if (ip_addr == NULL) {
 208                 struct sockaddr_storage cb_addr;
 209                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 210
 211                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 212                 if (error < 0)
 213                         goto error;
 214                 error = rpc_ntop(sap, buf, sizeof(buf));
 215                 if (error < 0)
 216                         goto error;
 217                 ip_addr = (const char *)buf;
 218         }
 219         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 220
 221         error = nfs_idmap_new(clp);
 222         if (error < 0) {
 223                 dprintk("%s: failed to create idmapper. Error = %d\n",
 224                         __func__, error);
 225                 goto error;
 226         }
 227         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 228
 229         error = nfs4_init_client_minor_version(clp);
 230         if (error < 0)
 231                 goto error;
 232
 233         if (!nfs4_has_session(clp))
 234                 nfs_mark_client_ready(clp, NFS_CS_READY);
 235
 236         error = nfs4_discover_server_trunking(clp, &old);
 237         if (error < 0)
 238                 goto error;
 239         nfs_put_client(clp);
 240         if (clp != old) {
 241                 clp->cl_preserve_clid = true;
 242                 clp = old;
 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, *prev = NULL;
 304         struct nfs4_setclientid_res clid = {
 305                 .clientid       = new->cl_clientid,
 306                 .confirm        = new->cl_confirm,
 307         };
 308         int status = -NFS4ERR_STALE_CLIENTID;
 309
 310         spin_lock(&nn->nfs_client_lock);
 311         list_for_each_entry(pos, &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                         atomic_inc(&pos->cl_count);
 316                         spin_unlock(&nn->nfs_client_lock);
 317
 318                         if (prev)
 319                                 nfs_put_client(prev);
 320                         prev = pos;
 321
 322                         status = nfs_wait_client_init_complete(pos);
 323                         spin_lock(&nn->nfs_client_lock);
 324                         if (status < 0)
 325                                 continue;
 326                 }
 327                 if (pos->cl_cons_state != NFS_CS_READY)
 328                         continue;
 329
 330                 if (pos->rpc_ops != new->rpc_ops)
 331                         continue;
 332
 333                 if (pos->cl_proto != new->cl_proto)
 334                         continue;
 335
 336                 if (pos->cl_minorversion != new->cl_minorversion)
 337                         continue;
 338
 339                 if (pos->cl_clientid != new->cl_clientid)
 340                         continue;
 341
 342                 atomic_inc(&pos->cl_count);
 343                 spin_unlock(&nn->nfs_client_lock);
 344
 345                 if (prev)
 346                         nfs_put_client(prev);
 347                 prev = pos;
 348
 349                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 350                 switch (status) {
 351                 case -NFS4ERR_STALE_CLIENTID:
 352                         break;
 353                 case 0:
 354                         nfs4_swap_callback_idents(pos, new);
 355
 356                         prev = NULL;
 357                         *result = pos;
 358                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 359                                 __func__, pos, atomic_read(&pos->cl_count));
 360                 default:
 361                         goto out;
 362                 }
 363
 364                 spin_lock(&nn->nfs_client_lock);
 365         }
 366         spin_unlock(&nn->nfs_client_lock);
 367
 368         /* No match found. The server lost our clientid */
 369 out:
 370         if (prev)
 371                 nfs_put_client(prev);
 372         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 373         return status;
 374 }
 375
 376 #ifdef CONFIG_NFS_V4_1
 377 /*
 378  * Returns true if the client IDs match
 379  */
 380 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 381 {
 382         if (a->cl_clientid != b->cl_clientid) {
 383                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 384                         __func__, a->cl_clientid, b->cl_clientid);
 385                 return false;
 386         }
 387         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 388                 __func__, a->cl_clientid, b->cl_clientid);
 389         return true;
 390 }
 391
 392 /*
 393  * Returns true if the server owners match
 394  */
 395 static bool
 396 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 397 {
 398         struct nfs41_server_owner *o1 = a->cl_serverowner;
 399         struct nfs41_server_owner *o2 = b->cl_serverowner;
 400
 401         if (o1->minor_id != o2->minor_id) {
 402                 dprintk("NFS: --> %s server owner minor IDs do not match\n",
 403                         __func__);
 404                 return false;
 405         }
 406
 407         if (o1->major_id_sz != o2->major_id_sz)
 408                 goto out_major_mismatch;
 409         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 410                 goto out_major_mismatch;
 411
 412         dprintk("NFS: --> %s server owners match\n", __func__);
 413         return true;
 414
 415 out_major_mismatch:
 416         dprintk("NFS: --> %s server owner major IDs do not match\n",
 417                 __func__);
 418         return false;
 419 }
 420
 421 /**
 422  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 423  *
 424  * @new: nfs_client with client ID to test
 425  * @result: OUT: found nfs_client, or new
 426  * @cred: credential to use for trunking test
 427  *
 428  * Returns zero, a negative errno, or a negative NFS4ERR status.
 429  * If zero is returned, an nfs_client pointer is planted in "result."
 430  *
 431  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 432  *     the last nfs_client on the list.
 433  */
 434 int nfs41_walk_client_list(struct nfs_client *new,
 435                            struct nfs_client **result,
 436                            struct rpc_cred *cred)
 437 {
 438         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 439         struct nfs_client *pos, *prev = NULL;
 440         int status = -NFS4ERR_STALE_CLIENTID;
 441
 442         spin_lock(&nn->nfs_client_lock);
 443         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 444                 /* If "pos" isn't marked ready, we can't trust the
 445                  * remaining fields in "pos", especially the client
 446                  * ID and serverowner fields.  Wait for CREATE_SESSION
 447                  * to finish. */
 448                 if (pos->cl_cons_state > NFS_CS_READY) {
 449                         atomic_inc(&pos->cl_count);
 450                         spin_unlock(&nn->nfs_client_lock);
 451
 452                         if (prev)
 453                                 nfs_put_client(prev);
 454                         prev = pos;
 455
 456                         status = nfs_wait_client_init_complete(pos);
 457                         if (status == 0) {
 458                                 nfs4_schedule_lease_recovery(pos);
 459                                 status = nfs4_wait_clnt_recover(pos);
 460                         }
 461                         spin_lock(&nn->nfs_client_lock);
 462                         if (status < 0)
 463                                 continue;
 464                 }
 465                 if (pos->cl_cons_state != NFS_CS_READY)
 466                         continue;
 467
 468                 if (pos->rpc_ops != new->rpc_ops)
 469                         continue;
 470
 471                 if (pos->cl_proto != new->cl_proto)
 472                         continue;
 473
 474                 if (pos->cl_minorversion != new->cl_minorversion)
 475                         continue;
 476
 477                 if (!nfs4_match_clientids(pos, new))
 478                         continue;
 479
 480                 if (!nfs4_match_serverowners(pos, new))
 481                         continue;
 482
 483                 atomic_inc(&pos->cl_count);
 484                 *result = pos;
 485                 status = 0;
 486                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 487                         __func__, pos, atomic_read(&pos->cl_count));
 488                 break;
 489         }
 490
 491         /* No matching nfs_client found. */
 492         spin_unlock(&nn->nfs_client_lock);
 493         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 494         if (prev)
 495                 nfs_put_client(prev);
 496         return status;
 497 }
 498 #endif  /* CONFIG_NFS_V4_1 */
 499
 500 static void nfs4_destroy_server(struct nfs_server *server)
 501 {
 502         nfs_server_return_all_delegations(server);
 503         unset_pnfs_layoutdriver(server);
 504         nfs4_purge_state_owners(server);
 505 }
 506
 507 /*
 508  * NFSv4.0 callback thread helper
 509  *
 510  * Find a client by callback identifier
 511  */
 512 struct nfs_client *
 513 nfs4_find_client_ident(struct net *net, int cb_ident)
 514 {
 515         struct nfs_client *clp;
 516         struct nfs_net *nn = net_generic(net, nfs_net_id);
 517
 518         spin_lock(&nn->nfs_client_lock);
 519         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 520         if (clp)
 521                 atomic_inc(&clp->cl_count);
 522         spin_unlock(&nn->nfs_client_lock);
 523         return clp;
 524 }
 525
 526 #if defined(CONFIG_NFS_V4_1)
 527 /* Common match routine for v4.0 and v4.1 callback services */
 528 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 529                 struct nfs_client *clp, u32 minorversion)
 530 {
 531         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 532
 533         /* Don't match clients that failed to initialise */
 534         if (!(clp->cl_cons_state == NFS_CS_READY ||
 535             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 536                 return false;
 537
 538         smp_rmb();
 539
 540         /* Match the version and minorversion */
 541         if (clp->rpc_ops->version != 4 ||
 542             clp->cl_minorversion != minorversion)
 543                 return false;
 544
 545         /* Match only the IP address, not the port number */
 546         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 547                 return false;
 548
 549         return true;
 550 }
 551
 552 /*
 553  * NFSv4.1 callback thread helper
 554  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 555  * minorversion, and sessionID
 556  *
 557  * Returns NULL if no such client
 558  */
 559 struct nfs_client *
 560 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 561                            struct nfs4_sessionid *sid)
 562 {
 563         struct nfs_client *clp;
 564         struct nfs_net *nn = net_generic(net, nfs_net_id);
 565
 566         spin_lock(&nn->nfs_client_lock);
 567         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 568                 if (nfs4_cb_match_client(addr, clp, 1) == false)
 569                         continue;
 570
 571                 if (!nfs4_has_session(clp))
 572                         continue;
 573
 574                 /* Match sessionid*/
 575                 if (memcmp(clp->cl_session->sess_id.data,
 576                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 577                         continue;
 578
 579                 atomic_inc(&clp->cl_count);
 580                 spin_unlock(&nn->nfs_client_lock);
 581                 return clp;
 582         }
 583         spin_unlock(&nn->nfs_client_lock);
 584         return NULL;
 585 }
 586
 587 #else /* CONFIG_NFS_V4_1 */
 588
 589 struct nfs_client *
 590 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 591                            struct nfs4_sessionid *sid)
 592 {
 593         return NULL;
 594 }
 595 #endif /* CONFIG_NFS_V4_1 */
 596
 597 /*
 598  * Set up an NFS4 client
 599  */
 600 static int nfs4_set_client(struct nfs_server *server,
 601                 const char *hostname,
 602                 const struct sockaddr *addr,
 603                 const size_t addrlen,
 604                 const char *ip_addr,
 605                 rpc_authflavor_t authflavour,
 606                 int proto, const struct rpc_timeout *timeparms,
 607                 u32 minorversion, struct net *net)
 608 {
 609         struct nfs_client_initdata cl_init = {
 610                 .hostname = hostname,
 611                 .addr = addr,
 612                 .addrlen = addrlen,
 613                 .nfs_mod = &nfs_v4,
 614                 .proto = proto,
 615                 .minorversion = minorversion,
 616                 .net = net,
 617         };
 618         struct nfs_client *clp;
 619         int error;
 620
 621         dprintk("--> nfs4_set_client()\n");
 622
 623         if (server->flags & NFS_MOUNT_NORESVPORT)
 624                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 625
 626         /* Allocate or find a client reference we can use */
 627         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 628         if (IS_ERR(clp)) {
 629                 error = PTR_ERR(clp);
 630                 goto error;
 631         }
 632
 633         /*
 634          * Query for the lease time on clientid setup or renewal
 635          *
 636          * Note that this will be set on nfs_clients that were created
 637          * only for the DS role and did not set this bit, but now will
 638          * serve a dual role.
 639          */
 640         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 641
 642         server->nfs_client = clp;
 643         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 644         return 0;
 645 error:
 646         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 647         return error;
 648 }
 649
 650 /*
 651  * Set up a pNFS Data Server client.
 652  *
 653  * Return any existing nfs_client that matches server address,port,version
 654  * and minorversion.
 655  *
 656  * For a new nfs_client, use a soft mount (default), a low retrans and a
 657  * low timeout interval so that if a connection is lost, we retry through
 658  * the MDS.
 659  */
 660 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 661                 const struct sockaddr *ds_addr, int ds_addrlen,
 662                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 663 {
 664         struct nfs_client_initdata cl_init = {
 665                 .addr = ds_addr,
 666                 .addrlen = ds_addrlen,
 667                 .nfs_mod = &nfs_v4,
 668                 .proto = ds_proto,
 669                 .minorversion = mds_clp->cl_minorversion,
 670                 .net = mds_clp->cl_net,
 671         };
 672         struct rpc_timeout ds_timeout;
 673         struct nfs_client *clp;
 674
 675         /*
 676          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 677          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 678          * (section 13.1 RFC 5661).
 679          */
 680         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 681         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 682                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 683
 684         dprintk("<-- %s %p\n", __func__, clp);
 685         return clp;
 686 }
 687 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 688
 689 /*
 690  * Session has been established, and the client marked ready.
 691  * Set the mount rsize and wsize with negotiated fore channel
 692  * attributes which will be bound checked in nfs_server_set_fsinfo.
 693  */
 694 static void nfs4_session_set_rwsize(struct nfs_server *server)
 695 {
 696 #ifdef CONFIG_NFS_V4_1
 697         struct nfs4_session *sess;
 698         u32 server_resp_sz;
 699         u32 server_rqst_sz;
 700
 701         if (!nfs4_has_session(server->nfs_client))
 702                 return;
 703         sess = server->nfs_client->cl_session;
 704         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 705         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 706
 707         if (server->rsize > server_resp_sz)
 708                 server->rsize = server_resp_sz;
 709         if (server->wsize > server_rqst_sz)
 710                 server->wsize = server_rqst_sz;
 711 #endif /* CONFIG_NFS_V4_1 */
 712 }
 713
 714 static int nfs4_server_common_setup(struct nfs_server *server,
 715                 struct nfs_fh *mntfh)
 716 {
 717         struct nfs_fattr *fattr;
 718         int error;
 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 }