linux/fs/nfs/nfs4client.c
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   1/*
   2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   3 * Written by David Howells (dhowells@redhat.com)
   4 */
   5#include <linux/module.h>
   6#include <linux/nfs_fs.h>
   7#include <linux/nfs_idmap.h>
   8#include <linux/nfs_mount.h>
   9#include <linux/sunrpc/auth.h>
  10#include <linux/sunrpc/xprt.h>
  11#include <linux/sunrpc/bc_xprt.h>
  12#include "internal.h"
  13#include "callback.h"
  14#include "delegation.h"
  15#include "pnfs.h"
  16#include "netns.h"
  17
  18#define NFSDBG_FACILITY         NFSDBG_CLIENT
  19
  20/*
  21 * Get a unique NFSv4.0 callback identifier which will be used
  22 * by the V4.0 callback service to lookup the nfs_client struct
  23 */
  24static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  25{
  26        int ret = 0;
  27        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  28
  29        if (clp->rpc_ops->version != 4 || minorversion != 0)
  30                return ret;
  31retry:
  32        if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
  33                return -ENOMEM;
  34        spin_lock(&nn->nfs_client_lock);
  35        ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
  36        spin_unlock(&nn->nfs_client_lock);
  37        if (ret == -EAGAIN)
  38                goto retry;
  39        return ret;
  40}
  41
  42#ifdef CONFIG_NFS_V4_1
  43static void nfs4_shutdown_session(struct nfs_client *clp)
  44{
  45        if (nfs4_has_session(clp)) {
  46                nfs4_destroy_session(clp->cl_session);
  47                nfs4_destroy_clientid(clp);
  48        }
  49
  50}
  51#else /* CONFIG_NFS_V4_1 */
  52static void nfs4_shutdown_session(struct nfs_client *clp)
  53{
  54}
  55#endif /* CONFIG_NFS_V4_1 */
  56
  57struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
  58{
  59        int err;
  60        struct nfs_client *clp = nfs_alloc_client(cl_init);
  61        if (IS_ERR(clp))
  62                return clp;
  63
  64        err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
  65        if (err)
  66                goto error;
  67
  68        spin_lock_init(&clp->cl_lock);
  69        INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
  70        rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
  71        clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
  72        clp->cl_minorversion = cl_init->minorversion;
  73        clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
  74        return clp;
  75
  76error:
  77        nfs_free_client(clp);
  78        return ERR_PTR(err);
  79}
  80
  81/*
  82 * Destroy the NFS4 callback service
  83 */
  84static void nfs4_destroy_callback(struct nfs_client *clp)
  85{
  86        if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
  87                nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
  88}
  89
  90static void nfs4_shutdown_client(struct nfs_client *clp)
  91{
  92        if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
  93                nfs4_kill_renewd(clp);
  94        nfs4_shutdown_session(clp);
  95        nfs4_destroy_callback(clp);
  96        if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
  97                nfs_idmap_delete(clp);
  98
  99        rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 100        kfree(clp->cl_serverowner);
 101        kfree(clp->cl_serverscope);
 102        kfree(clp->cl_implid);
 103}
 104
 105void nfs4_free_client(struct nfs_client *clp)
 106{
 107        nfs4_shutdown_client(clp);
 108        nfs_free_client(clp);
 109}
 110
 111/*
 112 * Initialize the NFS4 callback service
 113 */
 114static int nfs4_init_callback(struct nfs_client *clp)
 115{
 116        int error;
 117
 118        if (clp->rpc_ops->version == 4) {
 119                struct rpc_xprt *xprt;
 120
 121                xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 122
 123                if (nfs4_has_session(clp)) {
 124                        error = xprt_setup_backchannel(xprt,
 125                                                NFS41_BC_MIN_CALLBACKS);
 126                        if (error < 0)
 127                                return error;
 128                }
 129
 130                error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 131                if (error < 0) {
 132                        dprintk("%s: failed to start callback. Error = %d\n",
 133                                __func__, error);
 134                        return error;
 135                }
 136                __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 137        }
 138        return 0;
 139}
 140
 141/*
 142 * Initialize the minor version specific parts of an NFS4 client record
 143 */
 144static int nfs4_init_client_minor_version(struct nfs_client *clp)
 145{
 146#if defined(CONFIG_NFS_V4_1)
 147        if (clp->cl_mvops->minor_version) {
 148                struct nfs4_session *session = NULL;
 149                /*
 150                 * Create the session and mark it expired.
 151                 * When a SEQUENCE operation encounters the expired session
 152                 * it will do session recovery to initialize it.
 153                 */
 154                session = nfs4_alloc_session(clp);
 155                if (!session)
 156                        return -ENOMEM;
 157
 158                clp->cl_session = session;
 159                /*
 160                 * The create session reply races with the server back
 161                 * channel probe. Mark the client NFS_CS_SESSION_INITING
 162                 * so that the client back channel can find the
 163                 * nfs_client struct
 164                 */
 165                nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 166        }
 167#endif /* CONFIG_NFS_V4_1 */
 168
 169        return nfs4_init_callback(clp);
 170}
 171
 172/**
 173 * nfs4_init_client - Initialise an NFS4 client record
 174 *
 175 * @clp: nfs_client to initialise
 176 * @timeparms: timeout parameters for underlying RPC transport
 177 * @ip_addr: callback IP address in presentation format
 178 * @authflavor: authentication flavor for underlying RPC transport
 179 *
 180 * Returns pointer to an NFS client, or an ERR_PTR value.
 181 */
 182struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 183                                    const struct rpc_timeout *timeparms,
 184                                    const char *ip_addr,
 185                                    rpc_authflavor_t authflavour)
 186{
 187        char buf[INET6_ADDRSTRLEN + 1];
 188        struct nfs_client *old;
 189        int error;
 190
 191        if (clp->cl_cons_state == NFS_CS_READY) {
 192                /* the client is initialised already */
 193                dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 194                return clp;
 195        }
 196
 197        /* Check NFS protocol revision and initialize RPC op vector */
 198        clp->rpc_ops = &nfs_v4_clientops;
 199
 200        __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 201        error = nfs_create_rpc_client(clp, timeparms, authflavour);
 202        if (error < 0)
 203                goto error;
 204
 205        /* If no clientaddr= option was specified, find a usable cb address */
 206        if (ip_addr == NULL) {
 207                struct sockaddr_storage cb_addr;
 208                struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 209
 210                error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 211                if (error < 0)
 212                        goto error;
 213                error = rpc_ntop(sap, buf, sizeof(buf));
 214                if (error < 0)
 215                        goto error;
 216                ip_addr = (const char *)buf;
 217        }
 218        strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 219
 220        error = nfs_idmap_new(clp);
 221        if (error < 0) {
 222                dprintk("%s: failed to create idmapper. Error = %d\n",
 223                        __func__, error);
 224                goto error;
 225        }
 226        __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 227
 228        error = nfs4_init_client_minor_version(clp);
 229        if (error < 0)
 230                goto error;
 231
 232        if (!nfs4_has_session(clp))
 233                nfs_mark_client_ready(clp, NFS_CS_READY);
 234
 235        error = nfs4_discover_server_trunking(clp, &old);
 236        if (error < 0)
 237                goto error;
 238        if (clp != old) {
 239                clp->cl_preserve_clid = true;
 240                nfs_put_client(clp);
 241                clp = old;
 242                atomic_inc(&clp->cl_count);
 243        }
 244
 245        return clp;
 246
 247error:
 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 */
 262static 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 */
 298int nfs40_walk_client_list(struct nfs_client *new,
 299                           struct nfs_client **result,
 300                           struct rpc_cred *cred)
 301{
 302        struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 303        struct nfs_client *pos, *n, *prev = NULL;
 304        struct nfs4_setclientid_res clid = {
 305                .clientid       = new->cl_clientid,
 306                .confirm        = new->cl_confirm,
 307        };
 308        int status;
 309
 310        spin_lock(&nn->nfs_client_lock);
 311        list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
 312                /* If "pos" isn't marked ready, we can't trust the
 313                 * remaining fields in "pos" */
 314                if (pos->cl_cons_state < NFS_CS_READY)
 315                        continue;
 316
 317                if (pos->rpc_ops != new->rpc_ops)
 318                        continue;
 319
 320                if (pos->cl_proto != new->cl_proto)
 321                        continue;
 322
 323                if (pos->cl_minorversion != new->cl_minorversion)
 324                        continue;
 325
 326                if (pos->cl_clientid != new->cl_clientid)
 327                        continue;
 328
 329                atomic_inc(&pos->cl_count);
 330                spin_unlock(&nn->nfs_client_lock);
 331
 332                if (prev)
 333                        nfs_put_client(prev);
 334
 335                status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 336                if (status == 0) {
 337                        nfs4_swap_callback_idents(pos, new);
 338
 339                        nfs_put_client(pos);
 340                        *result = pos;
 341                        dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 342                                __func__, pos, atomic_read(&pos->cl_count));
 343                        return 0;
 344                }
 345                if (status != -NFS4ERR_STALE_CLIENTID) {
 346                        nfs_put_client(pos);
 347                        dprintk("NFS: <-- %s status = %d, no result\n",
 348                                __func__, status);
 349                        return status;
 350                }
 351
 352                spin_lock(&nn->nfs_client_lock);
 353                prev = pos;
 354        }
 355
 356        /*
 357         * No matching nfs_client found.  This should be impossible,
 358         * because the new nfs_client has already been added to
 359         * nfs_client_list by nfs_get_client().
 360         *
 361         * Don't BUG(), since the caller is holding a mutex.
 362         */
 363        if (prev)
 364                nfs_put_client(prev);
 365        spin_unlock(&nn->nfs_client_lock);
 366        pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
 367        return -NFS4ERR_STALE_CLIENTID;
 368}
 369
 370#ifdef CONFIG_NFS_V4_1
 371/*
 372 * Returns true if the client IDs match
 373 */
 374static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 375{
 376        if (a->cl_clientid != b->cl_clientid) {
 377                dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 378                        __func__, a->cl_clientid, b->cl_clientid);
 379                return false;
 380        }
 381        dprintk("NFS: --> %s client ID %llx matches %llx\n",
 382                __func__, a->cl_clientid, b->cl_clientid);
 383        return true;
 384}
 385
 386/*
 387 * Returns true if the server owners match
 388 */
 389static bool
 390nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 391{
 392        struct nfs41_server_owner *o1 = a->cl_serverowner;
 393        struct nfs41_server_owner *o2 = b->cl_serverowner;
 394
 395        if (o1->minor_id != o2->minor_id) {
 396                dprintk("NFS: --> %s server owner minor IDs do not match\n",
 397                        __func__);
 398                return false;
 399        }
 400
 401        if (o1->major_id_sz != o2->major_id_sz)
 402                goto out_major_mismatch;
 403        if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 404                goto out_major_mismatch;
 405
 406        dprintk("NFS: --> %s server owners match\n", __func__);
 407        return true;
 408
 409out_major_mismatch:
 410        dprintk("NFS: --> %s server owner major IDs do not match\n",
 411                __func__);
 412        return false;
 413}
 414
 415/**
 416 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 417 *
 418 * @new: nfs_client with client ID to test
 419 * @result: OUT: found nfs_client, or new
 420 * @cred: credential to use for trunking test
 421 *
 422 * Returns zero, a negative errno, or a negative NFS4ERR status.
 423 * If zero is returned, an nfs_client pointer is planted in "result."
 424 *
 425 * NB: nfs41_walk_client_list() relies on the new nfs_client being
 426 *     the last nfs_client on the list.
 427 */
 428int nfs41_walk_client_list(struct nfs_client *new,
 429                           struct nfs_client **result,
 430                           struct rpc_cred *cred)
 431{
 432        struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 433        struct nfs_client *pos, *n, *prev = NULL;
 434        int error;
 435
 436        spin_lock(&nn->nfs_client_lock);
 437        list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
 438                /* If "pos" isn't marked ready, we can't trust the
 439                 * remaining fields in "pos", especially the client
 440                 * ID and serverowner fields.  Wait for CREATE_SESSION
 441                 * to finish. */
 442                if (pos->cl_cons_state < NFS_CS_READY) {
 443                        atomic_inc(&pos->cl_count);
 444                        spin_unlock(&nn->nfs_client_lock);
 445
 446                        if (prev)
 447                                nfs_put_client(prev);
 448                        prev = pos;
 449
 450                        error = nfs_wait_client_init_complete(pos);
 451                        if (error < 0) {
 452                                nfs_put_client(pos);
 453                                spin_lock(&nn->nfs_client_lock);
 454                                continue;
 455                        }
 456
 457                        spin_lock(&nn->nfs_client_lock);
 458                }
 459
 460                if (pos->rpc_ops != new->rpc_ops)
 461                        continue;
 462
 463                if (pos->cl_proto != new->cl_proto)
 464                        continue;
 465
 466                if (pos->cl_minorversion != new->cl_minorversion)
 467                        continue;
 468
 469                if (!nfs4_match_clientids(pos, new))
 470                        continue;
 471
 472                if (!nfs4_match_serverowners(pos, new))
 473                        continue;
 474
 475                spin_unlock(&nn->nfs_client_lock);
 476                dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 477                        __func__, pos, atomic_read(&pos->cl_count));
 478
 479                *result = pos;
 480                return 0;
 481        }
 482
 483        /*
 484         * No matching nfs_client found.  This should be impossible,
 485         * because the new nfs_client has already been added to
 486         * nfs_client_list by nfs_get_client().
 487         *
 488         * Don't BUG(), since the caller is holding a mutex.
 489         */
 490        spin_unlock(&nn->nfs_client_lock);
 491        pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
 492        return -NFS4ERR_STALE_CLIENTID;
 493}
 494#endif  /* CONFIG_NFS_V4_1 */
 495
 496static void nfs4_destroy_server(struct nfs_server *server)
 497{
 498        nfs_server_return_all_delegations(server);
 499        unset_pnfs_layoutdriver(server);
 500        nfs4_purge_state_owners(server);
 501}
 502
 503/*
 504 * NFSv4.0 callback thread helper
 505 *
 506 * Find a client by callback identifier
 507 */
 508struct nfs_client *
 509nfs4_find_client_ident(struct net *net, int cb_ident)
 510{
 511        struct nfs_client *clp;
 512        struct nfs_net *nn = net_generic(net, nfs_net_id);
 513
 514        spin_lock(&nn->nfs_client_lock);
 515        clp = idr_find(&nn->cb_ident_idr, cb_ident);
 516        if (clp)
 517                atomic_inc(&clp->cl_count);
 518        spin_unlock(&nn->nfs_client_lock);
 519        return clp;
 520}
 521
 522#if defined(CONFIG_NFS_V4_1)
 523/* Common match routine for v4.0 and v4.1 callback services */
 524static bool nfs4_cb_match_client(const struct sockaddr *addr,
 525                struct nfs_client *clp, u32 minorversion)
 526{
 527        struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 528
 529        /* Don't match clients that failed to initialise */
 530        if (!(clp->cl_cons_state == NFS_CS_READY ||
 531            clp->cl_cons_state == NFS_CS_SESSION_INITING))
 532                return false;
 533
 534        smp_rmb();
 535
 536        /* Match the version and minorversion */
 537        if (clp->rpc_ops->version != 4 ||
 538            clp->cl_minorversion != minorversion)
 539                return false;
 540
 541        /* Match only the IP address, not the port number */
 542        if (!nfs_sockaddr_match_ipaddr(addr, clap))
 543                return false;
 544
 545        return true;
 546}
 547
 548/*
 549 * NFSv4.1 callback thread helper
 550 * For CB_COMPOUND calls, find a client by IP address, protocol version,
 551 * minorversion, and sessionID
 552 *
 553 * Returns NULL if no such client
 554 */
 555struct nfs_client *
 556nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 557                           struct nfs4_sessionid *sid)
 558{
 559        struct nfs_client *clp;
 560        struct nfs_net *nn = net_generic(net, nfs_net_id);
 561
 562        spin_lock(&nn->nfs_client_lock);
 563        list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 564                if (nfs4_cb_match_client(addr, clp, 1) == false)
 565                        continue;
 566
 567                if (!nfs4_has_session(clp))
 568                        continue;
 569
 570                /* Match sessionid*/
 571                if (memcmp(clp->cl_session->sess_id.data,
 572                    sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 573                        continue;
 574
 575                atomic_inc(&clp->cl_count);
 576                spin_unlock(&nn->nfs_client_lock);
 577                return clp;
 578        }
 579        spin_unlock(&nn->nfs_client_lock);
 580        return NULL;
 581}
 582
 583#else /* CONFIG_NFS_V4_1 */
 584
 585struct nfs_client *
 586nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 587                           struct nfs4_sessionid *sid)
 588{
 589        return NULL;
 590}
 591#endif /* CONFIG_NFS_V4_1 */
 592
 593/*
 594 * Set up an NFS4 client
 595 */
 596static int nfs4_set_client(struct nfs_server *server,
 597                const char *hostname,
 598                const struct sockaddr *addr,
 599                const size_t addrlen,
 600                const char *ip_addr,
 601                rpc_authflavor_t authflavour,
 602                int proto, const struct rpc_timeout *timeparms,
 603                u32 minorversion, struct net *net)
 604{
 605        struct nfs_client_initdata cl_init = {
 606                .hostname = hostname,
 607                .addr = addr,
 608                .addrlen = addrlen,
 609                .nfs_mod = &nfs_v4,
 610                .proto = proto,
 611                .minorversion = minorversion,
 612                .net = net,
 613        };
 614        struct nfs_client *clp;
 615        int error;
 616
 617        dprintk("--> nfs4_set_client()\n");
 618
 619        if (server->flags & NFS_MOUNT_NORESVPORT)
 620                set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 621
 622        /* Allocate or find a client reference we can use */
 623        clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 624        if (IS_ERR(clp)) {
 625                error = PTR_ERR(clp);
 626                goto error;
 627        }
 628
 629        /*
 630         * Query for the lease time on clientid setup or renewal
 631         *
 632         * Note that this will be set on nfs_clients that were created
 633         * only for the DS role and did not set this bit, but now will
 634         * serve a dual role.
 635         */
 636        set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 637
 638        server->nfs_client = clp;
 639        dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 640        return 0;
 641error:
 642        dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 643        return error;
 644}
 645
 646/*
 647 * Set up a pNFS Data Server client.
 648 *
 649 * Return any existing nfs_client that matches server address,port,version
 650 * and minorversion.
 651 *
 652 * For a new nfs_client, use a soft mount (default), a low retrans and a
 653 * low timeout interval so that if a connection is lost, we retry through
 654 * the MDS.
 655 */
 656struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 657                const struct sockaddr *ds_addr, int ds_addrlen,
 658                int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 659{
 660        struct nfs_client_initdata cl_init = {
 661                .addr = ds_addr,
 662                .addrlen = ds_addrlen,
 663                .nfs_mod = &nfs_v4,
 664                .proto = ds_proto,
 665                .minorversion = mds_clp->cl_minorversion,
 666                .net = mds_clp->cl_net,
 667        };
 668        struct rpc_timeout ds_timeout;
 669        struct nfs_client *clp;
 670
 671        /*
 672         * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 673         * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 674         * (section 13.1 RFC 5661).
 675         */
 676        nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 677        clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 678                             mds_clp->cl_rpcclient->cl_auth->au_flavor);
 679
 680        dprintk("<-- %s %p\n", __func__, clp);
 681        return clp;
 682}
 683EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 684
 685/*
 686 * Session has been established, and the client marked ready.
 687 * Set the mount rsize and wsize with negotiated fore channel
 688 * attributes which will be bound checked in nfs_server_set_fsinfo.
 689 */
 690static void nfs4_session_set_rwsize(struct nfs_server *server)
 691{
 692#ifdef CONFIG_NFS_V4_1
 693        struct nfs4_session *sess;
 694        u32 server_resp_sz;
 695        u32 server_rqst_sz;
 696
 697        if (!nfs4_has_session(server->nfs_client))
 698                return;
 699        sess = server->nfs_client->cl_session;
 700        server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 701        server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 702
 703        if (server->rsize > server_resp_sz)
 704                server->rsize = server_resp_sz;
 705        if (server->wsize > server_rqst_sz)
 706                server->wsize = server_rqst_sz;
 707#endif /* CONFIG_NFS_V4_1 */
 708}
 709
 710static int nfs4_server_common_setup(struct nfs_server *server,
 711                struct nfs_fh *mntfh)
 712{
 713        struct nfs_fattr *fattr;
 714        int error;
 715
 716        BUG_ON(!server->nfs_client);
 717        BUG_ON(!server->nfs_client->rpc_ops);
 718        BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
 719
 720        /* data servers support only a subset of NFSv4.1 */
 721        if (is_ds_only_client(server->nfs_client))
 722                return -EPROTONOSUPPORT;
 723
 724        fattr = nfs_alloc_fattr();
 725        if (fattr == NULL)
 726                return -ENOMEM;
 727
 728        /* We must ensure the session is initialised first */
 729        error = nfs4_init_session(server);
 730        if (error < 0)
 731                goto out;
 732
 733        /* Probe the root fh to retrieve its FSID and filehandle */
 734        error = nfs4_get_rootfh(server, mntfh);
 735        if (error < 0)
 736                goto out;
 737
 738        dprintk("Server FSID: %llx:%llx\n",
 739                        (unsigned long long) server->fsid.major,
 740                        (unsigned long long) server->fsid.minor);
 741        dprintk("Mount FH: %d\n", mntfh->size);
 742
 743        nfs4_session_set_rwsize(server);
 744
 745        error = nfs_probe_fsinfo(server, mntfh, fattr);
 746        if (error < 0)
 747                goto out;
 748
 749        if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 750                server->namelen = NFS4_MAXNAMLEN;
 751
 752        nfs_server_insert_lists(server);
 753        server->mount_time = jiffies;
 754        server->destroy = nfs4_destroy_server;
 755out:
 756        nfs_free_fattr(fattr);
 757        return error;
 758}
 759
 760/*
 761 * Create a version 4 volume record
 762 */
 763static 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
 816error:
 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)*/
 828struct 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
 852error:
 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 */
 861struct 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
 906error:
 907        nfs_free_server(server);
 908        dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
 909        return ERR_PTR(error);
 910}
 911
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