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