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         if (clp->cl_minorversion != 0)
 202                 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 203         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 204         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
 205         if (error == -EINVAL)
 206                 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
 207         if (error < 0)
 208                 goto error;
 209
 210         /* If no clientaddr= option was specified, find a usable cb address */
 211         if (ip_addr == NULL) {
 212                 struct sockaddr_storage cb_addr;
 213                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 214
 215                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 216                 if (error < 0)
 217                         goto error;
 218                 error = rpc_ntop(sap, buf, sizeof(buf));
 219                 if (error < 0)
 220                         goto error;
 221                 ip_addr = (const char *)buf;
 222         }
 223         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 224
 225         error = nfs_idmap_new(clp);
 226         if (error < 0) {
 227                 dprintk("%s: failed to create idmapper. Error = %d\n",
 228                         __func__, error);
 229                 goto error;
 230         }
 231         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 232
 233         error = nfs4_init_client_minor_version(clp);
 234         if (error < 0)
 235                 goto error;
 236
 237         if (!nfs4_has_session(clp))
 238                 nfs_mark_client_ready(clp, NFS_CS_READY);
 239
 240         error = nfs4_discover_server_trunking(clp, &old);
 241         if (error < 0)
 242                 goto error;
 243
 244         if (clp != old)
 245                 clp->cl_preserve_clid = true;
 246         nfs_put_client(clp);
 247         return old;
 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, *prev = NULL;
 306         struct nfs4_setclientid_res clid = {
 307                 .clientid       = new->cl_clientid,
 308                 .confirm        = new->cl_confirm,
 309         };
 310         int status = -NFS4ERR_STALE_CLIENTID;
 311
 312         spin_lock(&nn->nfs_client_lock);
 313         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 314
 315                 if (pos->rpc_ops != new->rpc_ops)
 316                         continue;
 317
 318                 if (pos->cl_proto != new->cl_proto)
 319                         continue;
 320
 321                 if (pos->cl_minorversion != new->cl_minorversion)
 322                         continue;
 323
 324                 /* If "pos" isn't marked ready, we can't trust the
 325                  * remaining fields in "pos" */
 326                 if (pos->cl_cons_state > NFS_CS_READY) {
 327                         atomic_inc(&pos->cl_count);
 328                         spin_unlock(&nn->nfs_client_lock);
 329
 330                         if (prev)
 331                                 nfs_put_client(prev);
 332                         prev = pos;
 333
 334                         status = nfs_wait_client_init_complete(pos);
 335                         if (status < 0)
 336                                 goto out;
 337                         status = -NFS4ERR_STALE_CLIENTID;
 338                         spin_lock(&nn->nfs_client_lock);
 339                 }
 340                 if (pos->cl_cons_state != NFS_CS_READY)
 341                         continue;
 342
 343                 if (pos->cl_clientid != new->cl_clientid)
 344                         continue;
 345
 346                 atomic_inc(&pos->cl_count);
 347                 spin_unlock(&nn->nfs_client_lock);
 348
 349                 if (prev)
 350                         nfs_put_client(prev);
 351                 prev = pos;
 352
 353                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 354                 switch (status) {
 355                 case -NFS4ERR_STALE_CLIENTID:
 356                         break;
 357                 case 0:
 358                         nfs4_swap_callback_idents(pos, new);
 359
 360                         prev = NULL;
 361                         *result = pos;
 362                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 363                                 __func__, pos, atomic_read(&pos->cl_count));
 364                 default:
 365                         goto out;
 366                 }
 367
 368                 spin_lock(&nn->nfs_client_lock);
 369         }
 370         spin_unlock(&nn->nfs_client_lock);
 371
 372         /* No match found. The server lost our clientid */
 373 out:
 374         if (prev)
 375                 nfs_put_client(prev);
 376         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 377         return status;
 378 }
 379
 380 #ifdef CONFIG_NFS_V4_1
 381 /*
 382  * Returns true if the client IDs match
 383  */
 384 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 385 {
 386         if (a->cl_clientid != b->cl_clientid) {
 387                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 388                         __func__, a->cl_clientid, b->cl_clientid);
 389                 return false;
 390         }
 391         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 392                 __func__, a->cl_clientid, b->cl_clientid);
 393         return true;
 394 }
 395
 396 /*
 397  * Returns true if the server major ids match
 398  */
 399 static bool
 400 nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
 401 {
 402         struct nfs41_server_owner *o1 = a->cl_serverowner;
 403         struct nfs41_server_owner *o2 = b->cl_serverowner;
 404
 405         if (o1->major_id_sz != o2->major_id_sz)
 406                 goto out_major_mismatch;
 407         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 408                 goto out_major_mismatch;
 409
 410         dprintk("NFS: --> %s server owners match\n", __func__);
 411         return true;
 412
 413 out_major_mismatch:
 414         dprintk("NFS: --> %s server owner major IDs do not match\n",
 415                 __func__);
 416         return false;
 417 }
 418
 419 /**
 420  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 421  *
 422  * @new: nfs_client with client ID to test
 423  * @result: OUT: found nfs_client, or new
 424  * @cred: credential to use for trunking test
 425  *
 426  * Returns zero, a negative errno, or a negative NFS4ERR status.
 427  * If zero is returned, an nfs_client pointer is planted in "result."
 428  *
 429  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 430  *     the last nfs_client on the list.
 431  */
 432 int nfs41_walk_client_list(struct nfs_client *new,
 433                            struct nfs_client **result,
 434                            struct rpc_cred *cred)
 435 {
 436         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 437         struct nfs_client *pos, *prev = NULL;
 438         int status = -NFS4ERR_STALE_CLIENTID;
 439
 440         spin_lock(&nn->nfs_client_lock);
 441         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 442
 443                 if (pos->rpc_ops != new->rpc_ops)
 444                         continue;
 445
 446                 if (pos->cl_proto != new->cl_proto)
 447                         continue;
 448
 449                 if (pos->cl_minorversion != new->cl_minorversion)
 450                         continue;
 451
 452                 /* If "pos" isn't marked ready, we can't trust the
 453                  * remaining fields in "pos", especially the client
 454                  * ID and serverowner fields.  Wait for CREATE_SESSION
 455                  * to finish. */
 456                 if (pos->cl_cons_state > NFS_CS_READY) {
 457                         atomic_inc(&pos->cl_count);
 458                         spin_unlock(&nn->nfs_client_lock);
 459
 460                         if (prev)
 461                                 nfs_put_client(prev);
 462                         prev = pos;
 463
 464                         status = nfs_wait_client_init_complete(pos);
 465                         if (pos->cl_cons_state == NFS_CS_SESSION_INITING) {
 466                                 nfs4_schedule_lease_recovery(pos);
 467                                 status = nfs4_wait_clnt_recover(pos);
 468                         }
 469                         spin_lock(&nn->nfs_client_lock);
 470                         if (status < 0)
 471                                 break;
 472                         status = -NFS4ERR_STALE_CLIENTID;
 473                 }
 474                 if (pos->cl_cons_state != NFS_CS_READY)
 475                         continue;
 476
 477                 if (!nfs4_match_clientids(pos, new))
 478                         continue;
 479
 480                 /*
 481                  * Note that session trunking is just a special subcase of
 482                  * client id trunking. In either case, we want to fall back
 483                  * to using the existing nfs_client.
 484                  */
 485                 if (!nfs4_check_clientid_trunking(pos, new))
 486                         continue;
 487
 488                 atomic_inc(&pos->cl_count);
 489                 *result = pos;
 490                 status = 0;
 491                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 492                         __func__, pos, atomic_read(&pos->cl_count));
 493                 break;
 494         }
 495
 496         /* No matching nfs_client found. */
 497         spin_unlock(&nn->nfs_client_lock);
 498         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 499         if (prev)
 500                 nfs_put_client(prev);
 501         return status;
 502 }
 503 #endif  /* CONFIG_NFS_V4_1 */
 504
 505 static void nfs4_destroy_server(struct nfs_server *server)
 506 {
 507         nfs_server_return_all_delegations(server);
 508         unset_pnfs_layoutdriver(server);
 509         nfs4_purge_state_owners(server);
 510 }
 511
 512 /*
 513  * NFSv4.0 callback thread helper
 514  *
 515  * Find a client by callback identifier
 516  */
 517 struct nfs_client *
 518 nfs4_find_client_ident(struct net *net, int cb_ident)
 519 {
 520         struct nfs_client *clp;
 521         struct nfs_net *nn = net_generic(net, nfs_net_id);
 522
 523         spin_lock(&nn->nfs_client_lock);
 524         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 525         if (clp)
 526                 atomic_inc(&clp->cl_count);
 527         spin_unlock(&nn->nfs_client_lock);
 528         return clp;
 529 }
 530
 531 #if defined(CONFIG_NFS_V4_1)
 532 /* Common match routine for v4.0 and v4.1 callback services */
 533 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 534                 struct nfs_client *clp, u32 minorversion)
 535 {
 536         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 537
 538         /* Don't match clients that failed to initialise */
 539         if (!(clp->cl_cons_state == NFS_CS_READY ||
 540             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 541                 return false;
 542
 543         smp_rmb();
 544
 545         /* Match the version and minorversion */
 546         if (clp->rpc_ops->version != 4 ||
 547             clp->cl_minorversion != minorversion)
 548                 return false;
 549
 550         /* Match only the IP address, not the port number */
 551         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 552                 return false;
 553
 554         return true;
 555 }
 556
 557 /*
 558  * NFSv4.1 callback thread helper
 559  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 560  * minorversion, and sessionID
 561  *
 562  * Returns NULL if no such client
 563  */
 564 struct nfs_client *
 565 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 566                            struct nfs4_sessionid *sid)
 567 {
 568         struct nfs_client *clp;
 569         struct nfs_net *nn = net_generic(net, nfs_net_id);
 570
 571         spin_lock(&nn->nfs_client_lock);
 572         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 573                 if (nfs4_cb_match_client(addr, clp, 1) == false)
 574                         continue;
 575
 576                 if (!nfs4_has_session(clp))
 577                         continue;
 578
 579                 /* Match sessionid*/
 580                 if (memcmp(clp->cl_session->sess_id.data,
 581                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 582                         continue;
 583
 584                 atomic_inc(&clp->cl_count);
 585                 spin_unlock(&nn->nfs_client_lock);
 586                 return clp;
 587         }
 588         spin_unlock(&nn->nfs_client_lock);
 589         return NULL;
 590 }
 591
 592 #else /* CONFIG_NFS_V4_1 */
 593
 594 struct nfs_client *
 595 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 596                            struct nfs4_sessionid *sid)
 597 {
 598         return NULL;
 599 }
 600 #endif /* CONFIG_NFS_V4_1 */
 601
 602 /*
 603  * Set up an NFS4 client
 604  */
 605 static int nfs4_set_client(struct nfs_server *server,
 606                 const char *hostname,
 607                 const struct sockaddr *addr,
 608                 const size_t addrlen,
 609                 const char *ip_addr,
 610                 rpc_authflavor_t authflavour,
 611                 int proto, const struct rpc_timeout *timeparms,
 612                 u32 minorversion, struct net *net)
 613 {
 614         struct nfs_client_initdata cl_init = {
 615                 .hostname = hostname,
 616                 .addr = addr,
 617                 .addrlen = addrlen,
 618                 .nfs_mod = &nfs_v4,
 619                 .proto = proto,
 620                 .minorversion = minorversion,
 621                 .net = net,
 622         };
 623         struct nfs_client *clp;
 624         int error;
 625
 626         dprintk("--> nfs4_set_client()\n");
 627
 628         if (server->flags & NFS_MOUNT_NORESVPORT)
 629                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 630
 631         /* Allocate or find a client reference we can use */
 632         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 633         if (IS_ERR(clp)) {
 634                 error = PTR_ERR(clp);
 635                 goto error;
 636         }
 637
 638         /*
 639          * Query for the lease time on clientid setup or renewal
 640          *
 641          * Note that this will be set on nfs_clients that were created
 642          * only for the DS role and did not set this bit, but now will
 643          * serve a dual role.
 644          */
 645         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 646
 647         server->nfs_client = clp;
 648         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 649         return 0;
 650 error:
 651         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 652         return error;
 653 }
 654
 655 /*
 656  * Set up a pNFS Data Server client.
 657  *
 658  * Return any existing nfs_client that matches server address,port,version
 659  * and minorversion.
 660  *
 661  * For a new nfs_client, use a soft mount (default), a low retrans and a
 662  * low timeout interval so that if a connection is lost, we retry through
 663  * the MDS.
 664  */
 665 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 666                 const struct sockaddr *ds_addr, int ds_addrlen,
 667                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 668 {
 669         struct nfs_client_initdata cl_init = {
 670                 .addr = ds_addr,
 671                 .addrlen = ds_addrlen,
 672                 .nfs_mod = &nfs_v4,
 673                 .proto = ds_proto,
 674                 .minorversion = mds_clp->cl_minorversion,
 675                 .net = mds_clp->cl_net,
 676         };
 677         struct rpc_timeout ds_timeout;
 678         struct nfs_client *clp;
 679
 680         /*
 681          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 682          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 683          * (section 13.1 RFC 5661).
 684          */
 685         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 686         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 687                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 688
 689         dprintk("<-- %s %p\n", __func__, clp);
 690         return clp;
 691 }
 692 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 693
 694 /*
 695  * Session has been established, and the client marked ready.
 696  * Set the mount rsize and wsize with negotiated fore channel
 697  * attributes which will be bound checked in nfs_server_set_fsinfo.
 698  */
 699 static void nfs4_session_set_rwsize(struct nfs_server *server)
 700 {
 701 #ifdef CONFIG_NFS_V4_1
 702         struct nfs4_session *sess;
 703         u32 server_resp_sz;
 704         u32 server_rqst_sz;
 705
 706         if (!nfs4_has_session(server->nfs_client))
 707                 return;
 708         sess = server->nfs_client->cl_session;
 709         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 710         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 711
 712         if (server->rsize > server_resp_sz)
 713                 server->rsize = server_resp_sz;
 714         if (server->wsize > server_rqst_sz)
 715                 server->wsize = server_rqst_sz;
 716 #endif /* CONFIG_NFS_V4_1 */
 717 }
 718
 719 static int nfs4_server_common_setup(struct nfs_server *server,
 720                 struct nfs_fh *mntfh)
 721 {
 722         struct nfs_fattr *fattr;
 723         int error;
 724
 725         /* data servers support only a subset of NFSv4.1 */
 726         if (is_ds_only_client(server->nfs_client))
 727                 return -EPROTONOSUPPORT;
 728
 729         fattr = nfs_alloc_fattr();
 730         if (fattr == NULL)
 731                 return -ENOMEM;
 732
 733         /* We must ensure the session is initialised first */
 734         error = nfs4_init_session(server);
 735         if (error < 0)
 736                 goto out;
 737
 738         /* Set the basic capabilities */
 739         server->caps |= server->nfs_client->cl_mvops->init_caps;
 740         if (server->flags & NFS_MOUNT_NORDIRPLUS)
 741                         server->caps &= ~NFS_CAP_READDIRPLUS;
 742         /*
 743          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 744          * authentication.
 745          */
 746         if (nfs4_disable_idmapping &&
 747                         server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
 748                 server->caps |= NFS_CAP_UIDGID_NOMAP;
 749
 750
 751         /* Probe the root fh to retrieve its FSID and filehandle */
 752         error = nfs4_get_rootfh(server, mntfh);
 753         if (error < 0)
 754                 goto out;
 755
 756         dprintk("Server FSID: %llx:%llx\n",
 757                         (unsigned long long) server->fsid.major,
 758                         (unsigned long long) server->fsid.minor);
 759         dprintk("Mount FH: %d\n", mntfh->size);
 760
 761         nfs4_session_set_rwsize(server);
 762
 763         error = nfs_probe_fsinfo(server, mntfh, fattr);
 764         if (error < 0)
 765                 goto out;
 766
 767         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 768                 server->namelen = NFS4_MAXNAMLEN;
 769
 770         nfs_server_insert_lists(server);
 771         server->mount_time = jiffies;
 772         server->destroy = nfs4_destroy_server;
 773 out:
 774         nfs_free_fattr(fattr);
 775         return error;
 776 }
 777
 778 /*
 779  * Create a version 4 volume record
 780  */
 781 static int nfs4_init_server(struct nfs_server *server,
 782                 const struct nfs_parsed_mount_data *data)
 783 {
 784         struct rpc_timeout timeparms;
 785         int error;
 786
 787         dprintk("--> nfs4_init_server()\n");
 788
 789         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 790                         data->timeo, data->retrans);
 791
 792         /* Initialise the client representation from the mount data */
 793         server->flags = data->flags;
 794         server->options = data->options;
 795
 796         /* Get a client record */
 797         error = nfs4_set_client(server,
 798                         data->nfs_server.hostname,
 799                         (const struct sockaddr *)&data->nfs_server.address,
 800                         data->nfs_server.addrlen,
 801                         data->client_address,
 802                         data->auth_flavors[0],
 803                         data->nfs_server.protocol,
 804                         &timeparms,
 805                         data->minorversion,
 806                         data->net);
 807         if (error < 0)
 808                 goto error;
 809
 810         if (data->rsize)
 811                 server->rsize = nfs_block_size(data->rsize, NULL);
 812         if (data->wsize)
 813                 server->wsize = nfs_block_size(data->wsize, NULL);
 814
 815         server->acregmin = data->acregmin * HZ;
 816         server->acregmax = data->acregmax * HZ;
 817         server->acdirmin = data->acdirmin * HZ;
 818         server->acdirmax = data->acdirmax * HZ;
 819
 820         server->port = data->nfs_server.port;
 821
 822         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 823
 824 error:
 825         /* Done */
 826         dprintk("<-- nfs4_init_server() = %d\n", error);
 827         return error;
 828 }
 829
 830 /*
 831  * Create a version 4 volume record
 832  * - keyed on server and FSID
 833  */
 834 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
 835                                       struct nfs_fh *mntfh)*/
 836 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
 837                                       struct nfs_subversion *nfs_mod)
 838 {
 839         struct nfs_server *server;
 840         int error;
 841
 842         dprintk("--> nfs4_create_server()\n");
 843
 844         server = nfs_alloc_server();
 845         if (!server)
 846                 return ERR_PTR(-ENOMEM);
 847
 848         /* set up the general RPC client */
 849         error = nfs4_init_server(server, mount_info->parsed);
 850         if (error < 0)
 851                 goto error;
 852
 853         error = nfs4_server_common_setup(server, mount_info->mntfh);
 854         if (error < 0)
 855                 goto error;
 856
 857         dprintk("<-- nfs4_create_server() = %p\n", server);
 858         return server;
 859
 860 error:
 861         nfs_free_server(server);
 862         dprintk("<-- nfs4_create_server() = error %d\n", error);
 863         return ERR_PTR(error);
 864 }
 865
 866 /*
 867  * Create an NFS4 referral server record
 868  */
 869 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
 870                                                struct nfs_fh *mntfh)
 871 {
 872         struct nfs_client *parent_client;
 873         struct nfs_server *server, *parent_server;
 874         int error;
 875
 876         dprintk("--> nfs4_create_referral_server()\n");
 877
 878         server = nfs_alloc_server();
 879         if (!server)
 880                 return ERR_PTR(-ENOMEM);
 881
 882         parent_server = NFS_SB(data->sb);
 883         parent_client = parent_server->nfs_client;
 884
 885         /* Initialise the client representation from the parent server */
 886         nfs_server_copy_userdata(server, parent_server);
 887
 888         /* Get a client representation.
 889          * Note: NFSv4 always uses TCP, */
 890         error = nfs4_set_client(server, data->hostname,
 891                                 data->addr,
 892                                 data->addrlen,
 893                                 parent_client->cl_ipaddr,
 894                                 data->authflavor,
 895                                 rpc_protocol(parent_server->client),
 896                                 parent_server->client->cl_timeout,
 897                                 parent_client->cl_mvops->minor_version,
 898                                 parent_client->cl_net);
 899         if (error < 0)
 900                 goto error;
 901
 902         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
 903         if (error < 0)
 904                 goto error;
 905
 906         error = nfs4_server_common_setup(server, mntfh);
 907         if (error < 0)
 908                 goto error;
 909
 910         dprintk("<-- nfs_create_referral_server() = %p\n", server);
 911         return server;
 912
 913 error:
 914         nfs_free_server(server);
 915         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
 916         return ERR_PTR(error);
 917 }