linux/fs/nfs/client.c
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   1/* client.c: NFS client sharing and management code
   2 *
   3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12
  13#include <linux/module.h>
  14#include <linux/init.h>
  15#include <linux/sched.h>
  16#include <linux/time.h>
  17#include <linux/kernel.h>
  18#include <linux/mm.h>
  19#include <linux/string.h>
  20#include <linux/stat.h>
  21#include <linux/errno.h>
  22#include <linux/unistd.h>
  23#include <linux/sunrpc/clnt.h>
  24#include <linux/sunrpc/stats.h>
  25#include <linux/sunrpc/metrics.h>
  26#include <linux/sunrpc/xprtsock.h>
  27#include <linux/sunrpc/xprtrdma.h>
  28#include <linux/nfs_fs.h>
  29#include <linux/nfs_mount.h>
  30#include <linux/nfs4_mount.h>
  31#include <linux/lockd/bind.h>
  32#include <linux/seq_file.h>
  33#include <linux/mount.h>
  34#include <linux/nfs_idmap.h>
  35#include <linux/vfs.h>
  36#include <linux/inet.h>
  37#include <linux/in6.h>
  38#include <linux/slab.h>
  39#include <linux/idr.h>
  40#include <net/ipv6.h>
  41#include <linux/nfs_xdr.h>
  42#include <linux/sunrpc/bc_xprt.h>
  43#include <linux/nsproxy.h>
  44#include <linux/pid_namespace.h>
  45
  46
  47#include "nfs4_fs.h"
  48#include "callback.h"
  49#include "delegation.h"
  50#include "iostat.h"
  51#include "internal.h"
  52#include "fscache.h"
  53#include "pnfs.h"
  54#include "nfs.h"
  55#include "netns.h"
  56
  57#define NFSDBG_FACILITY         NFSDBG_CLIENT
  58
  59static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
  60static DEFINE_SPINLOCK(nfs_version_lock);
  61static DEFINE_MUTEX(nfs_version_mutex);
  62static LIST_HEAD(nfs_versions);
  63
  64/*
  65 * RPC cruft for NFS
  66 */
  67static const struct rpc_version *nfs_version[5] = {
  68        [2] = NULL,
  69        [3] = NULL,
  70        [4] = NULL,
  71};
  72
  73const struct rpc_program nfs_program = {
  74        .name                   = "nfs",
  75        .number                 = NFS_PROGRAM,
  76        .nrvers                 = ARRAY_SIZE(nfs_version),
  77        .version                = nfs_version,
  78        .stats                  = &nfs_rpcstat,
  79        .pipe_dir_name          = NFS_PIPE_DIRNAME,
  80};
  81
  82struct rpc_stat nfs_rpcstat = {
  83        .program                = &nfs_program
  84};
  85
  86static struct nfs_subversion *find_nfs_version(unsigned int version)
  87{
  88        struct nfs_subversion *nfs;
  89        spin_lock(&nfs_version_lock);
  90
  91        list_for_each_entry(nfs, &nfs_versions, list) {
  92                if (nfs->rpc_ops->version == version) {
  93                        spin_unlock(&nfs_version_lock);
  94                        return nfs;
  95                }
  96        };
  97
  98        spin_unlock(&nfs_version_lock);
  99        return ERR_PTR(-EPROTONOSUPPORT);;
 100}
 101
 102struct nfs_subversion *get_nfs_version(unsigned int version)
 103{
 104        struct nfs_subversion *nfs = find_nfs_version(version);
 105
 106        if (IS_ERR(nfs)) {
 107                mutex_lock(&nfs_version_mutex);
 108                request_module("nfsv%d", version);
 109                nfs = find_nfs_version(version);
 110                mutex_unlock(&nfs_version_mutex);
 111        }
 112
 113        if (!IS_ERR(nfs))
 114                try_module_get(nfs->owner);
 115        return nfs;
 116}
 117
 118void put_nfs_version(struct nfs_subversion *nfs)
 119{
 120        module_put(nfs->owner);
 121}
 122
 123void register_nfs_version(struct nfs_subversion *nfs)
 124{
 125        spin_lock(&nfs_version_lock);
 126
 127        list_add(&nfs->list, &nfs_versions);
 128        nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
 129
 130        spin_unlock(&nfs_version_lock);
 131}
 132EXPORT_SYMBOL_GPL(register_nfs_version);
 133
 134void unregister_nfs_version(struct nfs_subversion *nfs)
 135{
 136        spin_lock(&nfs_version_lock);
 137
 138        nfs_version[nfs->rpc_ops->version] = NULL;
 139        list_del(&nfs->list);
 140
 141        spin_unlock(&nfs_version_lock);
 142}
 143EXPORT_SYMBOL_GPL(unregister_nfs_version);
 144
 145/*
 146 * Allocate a shared client record
 147 *
 148 * Since these are allocated/deallocated very rarely, we don't
 149 * bother putting them in a slab cache...
 150 */
 151struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
 152{
 153        struct nfs_client *clp;
 154        struct rpc_cred *cred;
 155        int err = -ENOMEM;
 156
 157        if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
 158                goto error_0;
 159
 160        clp->cl_nfs_mod = cl_init->nfs_mod;
 161        try_module_get(clp->cl_nfs_mod->owner);
 162
 163        clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
 164
 165        atomic_set(&clp->cl_count, 1);
 166        clp->cl_cons_state = NFS_CS_INITING;
 167
 168        memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
 169        clp->cl_addrlen = cl_init->addrlen;
 170
 171        if (cl_init->hostname) {
 172                err = -ENOMEM;
 173                clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
 174                if (!clp->cl_hostname)
 175                        goto error_cleanup;
 176        }
 177
 178        INIT_LIST_HEAD(&clp->cl_superblocks);
 179        clp->cl_rpcclient = ERR_PTR(-EINVAL);
 180
 181        clp->cl_proto = cl_init->proto;
 182        clp->cl_net = get_net(cl_init->net);
 183
 184        cred = rpc_lookup_machine_cred("*");
 185        if (!IS_ERR(cred))
 186                clp->cl_machine_cred = cred;
 187        nfs_fscache_get_client_cookie(clp);
 188
 189        return clp;
 190
 191error_cleanup:
 192        put_nfs_version(clp->cl_nfs_mod);
 193        kfree(clp);
 194error_0:
 195        return ERR_PTR(err);
 196}
 197EXPORT_SYMBOL_GPL(nfs_alloc_client);
 198
 199#if IS_ENABLED(CONFIG_NFS_V4)
 200/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
 201void nfs_cleanup_cb_ident_idr(struct net *net)
 202{
 203        struct nfs_net *nn = net_generic(net, nfs_net_id);
 204
 205        idr_destroy(&nn->cb_ident_idr);
 206}
 207
 208/* nfs_client_lock held */
 209static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
 210{
 211        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
 212
 213        if (clp->cl_cb_ident)
 214                idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
 215}
 216
 217static void pnfs_init_server(struct nfs_server *server)
 218{
 219        rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
 220}
 221
 222#else
 223void nfs_cleanup_cb_ident_idr(struct net *net)
 224{
 225}
 226
 227static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
 228{
 229}
 230
 231static void pnfs_init_server(struct nfs_server *server)
 232{
 233}
 234
 235#endif /* CONFIG_NFS_V4 */
 236
 237/*
 238 * Destroy a shared client record
 239 */
 240void nfs_free_client(struct nfs_client *clp)
 241{
 242        dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
 243
 244        nfs_fscache_release_client_cookie(clp);
 245
 246        /* -EIO all pending I/O */
 247        if (!IS_ERR(clp->cl_rpcclient))
 248                rpc_shutdown_client(clp->cl_rpcclient);
 249
 250        if (clp->cl_machine_cred != NULL)
 251                put_rpccred(clp->cl_machine_cred);
 252
 253        put_net(clp->cl_net);
 254        put_nfs_version(clp->cl_nfs_mod);
 255        kfree(clp->cl_hostname);
 256        kfree(clp);
 257
 258        dprintk("<-- nfs_free_client()\n");
 259}
 260EXPORT_SYMBOL_GPL(nfs_free_client);
 261
 262/*
 263 * Release a reference to a shared client record
 264 */
 265void nfs_put_client(struct nfs_client *clp)
 266{
 267        struct nfs_net *nn;
 268
 269        if (!clp)
 270                return;
 271
 272        dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
 273        nn = net_generic(clp->cl_net, nfs_net_id);
 274
 275        if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
 276                list_del(&clp->cl_share_link);
 277                nfs_cb_idr_remove_locked(clp);
 278                spin_unlock(&nn->nfs_client_lock);
 279
 280                BUG_ON(!list_empty(&clp->cl_superblocks));
 281
 282                clp->rpc_ops->free_client(clp);
 283        }
 284}
 285EXPORT_SYMBOL_GPL(nfs_put_client);
 286
 287#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 288/*
 289 * Test if two ip6 socket addresses refer to the same socket by
 290 * comparing relevant fields. The padding bytes specifically, are not
 291 * compared. sin6_flowinfo is not compared because it only affects QoS
 292 * and sin6_scope_id is only compared if the address is "link local"
 293 * because "link local" addresses need only be unique to a specific
 294 * link. Conversely, ordinary unicast addresses might have different
 295 * sin6_scope_id.
 296 *
 297 * The caller should ensure both socket addresses are AF_INET6.
 298 */
 299static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
 300                                      const struct sockaddr *sa2)
 301{
 302        const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
 303        const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
 304
 305        if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
 306                return 0;
 307        else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 308                return sin1->sin6_scope_id == sin2->sin6_scope_id;
 309
 310        return 1;
 311}
 312#else   /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
 313static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
 314                                      const struct sockaddr *sa2)
 315{
 316        return 0;
 317}
 318#endif
 319
 320/*
 321 * Test if two ip4 socket addresses refer to the same socket, by
 322 * comparing relevant fields. The padding bytes specifically, are
 323 * not compared.
 324 *
 325 * The caller should ensure both socket addresses are AF_INET.
 326 */
 327static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
 328                                      const struct sockaddr *sa2)
 329{
 330        const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
 331        const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
 332
 333        return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
 334}
 335
 336static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
 337                                const struct sockaddr *sa2)
 338{
 339        const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
 340        const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
 341
 342        return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
 343                (sin1->sin6_port == sin2->sin6_port);
 344}
 345
 346static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
 347                                const struct sockaddr *sa2)
 348{
 349        const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
 350        const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
 351
 352        return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
 353                (sin1->sin_port == sin2->sin_port);
 354}
 355
 356#if defined(CONFIG_NFS_V4_1)
 357/*
 358 * Test if two socket addresses represent the same actual socket,
 359 * by comparing (only) relevant fields, excluding the port number.
 360 */
 361int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
 362                              const struct sockaddr *sa2)
 363{
 364        if (sa1->sa_family != sa2->sa_family)
 365                return 0;
 366
 367        switch (sa1->sa_family) {
 368        case AF_INET:
 369                return nfs_sockaddr_match_ipaddr4(sa1, sa2);
 370        case AF_INET6:
 371                return nfs_sockaddr_match_ipaddr6(sa1, sa2);
 372        }
 373        return 0;
 374}
 375EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr);
 376#endif /* CONFIG_NFS_V4_1 */
 377
 378/*
 379 * Test if two socket addresses represent the same actual socket,
 380 * by comparing (only) relevant fields, including the port number.
 381 */
 382static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
 383                            const struct sockaddr *sa2)
 384{
 385        if (sa1->sa_family != sa2->sa_family)
 386                return 0;
 387
 388        switch (sa1->sa_family) {
 389        case AF_INET:
 390                return nfs_sockaddr_cmp_ip4(sa1, sa2);
 391        case AF_INET6:
 392                return nfs_sockaddr_cmp_ip6(sa1, sa2);
 393        }
 394        return 0;
 395}
 396
 397/*
 398 * Find an nfs_client on the list that matches the initialisation data
 399 * that is supplied.
 400 */
 401static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
 402{
 403        struct nfs_client *clp;
 404        const struct sockaddr *sap = data->addr;
 405        struct nfs_net *nn = net_generic(data->net, nfs_net_id);
 406
 407        list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 408                const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 409                /* Don't match clients that failed to initialise properly */
 410                if (clp->cl_cons_state < 0)
 411                        continue;
 412
 413                /* Different NFS versions cannot share the same nfs_client */
 414                if (clp->rpc_ops != data->nfs_mod->rpc_ops)
 415                        continue;
 416
 417                if (clp->cl_proto != data->proto)
 418                        continue;
 419                /* Match nfsv4 minorversion */
 420                if (clp->cl_minorversion != data->minorversion)
 421                        continue;
 422                /* Match the full socket address */
 423                if (!nfs_sockaddr_cmp(sap, clap))
 424                        continue;
 425
 426                atomic_inc(&clp->cl_count);
 427                return clp;
 428        }
 429        return NULL;
 430}
 431
 432static bool nfs_client_init_is_complete(const struct nfs_client *clp)
 433{
 434        return clp->cl_cons_state != NFS_CS_INITING;
 435}
 436
 437int nfs_wait_client_init_complete(const struct nfs_client *clp)
 438{
 439        return wait_event_killable(nfs_client_active_wq,
 440                        nfs_client_init_is_complete(clp));
 441}
 442EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
 443
 444/*
 445 * Found an existing client.  Make sure it's ready before returning.
 446 */
 447static struct nfs_client *
 448nfs_found_client(const struct nfs_client_initdata *cl_init,
 449                 struct nfs_client *clp)
 450{
 451        int error;
 452
 453        error = nfs_wait_client_init_complete(clp);
 454        if (error < 0) {
 455                nfs_put_client(clp);
 456                return ERR_PTR(-ERESTARTSYS);
 457        }
 458
 459        if (clp->cl_cons_state < NFS_CS_READY) {
 460                error = clp->cl_cons_state;
 461                nfs_put_client(clp);
 462                return ERR_PTR(error);
 463        }
 464
 465        smp_rmb();
 466
 467        dprintk("<-- %s found nfs_client %p for %s\n",
 468                __func__, clp, cl_init->hostname ?: "");
 469        return clp;
 470}
 471
 472/*
 473 * Look up a client by IP address and protocol version
 474 * - creates a new record if one doesn't yet exist
 475 */
 476struct nfs_client *
 477nfs_get_client(const struct nfs_client_initdata *cl_init,
 478               const struct rpc_timeout *timeparms,
 479               const char *ip_addr,
 480               rpc_authflavor_t authflavour)
 481{
 482        struct nfs_client *clp, *new = NULL;
 483        struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
 484        const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
 485
 486        dprintk("--> nfs_get_client(%s,v%u)\n",
 487                cl_init->hostname ?: "", rpc_ops->version);
 488
 489        /* see if the client already exists */
 490        do {
 491                spin_lock(&nn->nfs_client_lock);
 492
 493                clp = nfs_match_client(cl_init);
 494                if (clp) {
 495                        spin_unlock(&nn->nfs_client_lock);
 496                        if (new)
 497                                new->rpc_ops->free_client(new);
 498                        return nfs_found_client(cl_init, clp);
 499                }
 500                if (new) {
 501                        list_add(&new->cl_share_link, &nn->nfs_client_list);
 502                        spin_unlock(&nn->nfs_client_lock);
 503                        new->cl_flags = cl_init->init_flags;
 504                        return rpc_ops->init_client(new, timeparms, ip_addr,
 505                                                    authflavour);
 506                }
 507
 508                spin_unlock(&nn->nfs_client_lock);
 509
 510                new = rpc_ops->alloc_client(cl_init);
 511        } while (!IS_ERR(new));
 512
 513        dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
 514                cl_init->hostname ?: "", PTR_ERR(new));
 515        return new;
 516}
 517EXPORT_SYMBOL_GPL(nfs_get_client);
 518
 519/*
 520 * Mark a server as ready or failed
 521 */
 522void nfs_mark_client_ready(struct nfs_client *clp, int state)
 523{
 524        smp_wmb();
 525        clp->cl_cons_state = state;
 526        wake_up_all(&nfs_client_active_wq);
 527}
 528EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
 529
 530/*
 531 * Initialise the timeout values for a connection
 532 */
 533void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
 534                                    unsigned int timeo, unsigned int retrans)
 535{
 536        to->to_initval = timeo * HZ / 10;
 537        to->to_retries = retrans;
 538
 539        switch (proto) {
 540        case XPRT_TRANSPORT_TCP:
 541        case XPRT_TRANSPORT_RDMA:
 542                if (to->to_retries == 0)
 543                        to->to_retries = NFS_DEF_TCP_RETRANS;
 544                if (to->to_initval == 0)
 545                        to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
 546                if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
 547                        to->to_initval = NFS_MAX_TCP_TIMEOUT;
 548                to->to_increment = to->to_initval;
 549                to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
 550                if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
 551                        to->to_maxval = NFS_MAX_TCP_TIMEOUT;
 552                if (to->to_maxval < to->to_initval)
 553                        to->to_maxval = to->to_initval;
 554                to->to_exponential = 0;
 555                break;
 556        case XPRT_TRANSPORT_UDP:
 557                if (to->to_retries == 0)
 558                        to->to_retries = NFS_DEF_UDP_RETRANS;
 559                if (!to->to_initval)
 560                        to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
 561                if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
 562                        to->to_initval = NFS_MAX_UDP_TIMEOUT;
 563                to->to_maxval = NFS_MAX_UDP_TIMEOUT;
 564                to->to_exponential = 1;
 565                break;
 566        default:
 567                BUG();
 568        }
 569}
 570EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
 571
 572/*
 573 * Create an RPC client handle
 574 */
 575int nfs_create_rpc_client(struct nfs_client *clp,
 576                          const struct rpc_timeout *timeparms,
 577                          rpc_authflavor_t flavor)
 578{
 579        struct rpc_clnt         *clnt = NULL;
 580        struct rpc_create_args args = {
 581                .net            = clp->cl_net,
 582                .protocol       = clp->cl_proto,
 583                .address        = (struct sockaddr *)&clp->cl_addr,
 584                .addrsize       = clp->cl_addrlen,
 585                .timeout        = timeparms,
 586                .servername     = clp->cl_hostname,
 587                .program        = &nfs_program,
 588                .version        = clp->rpc_ops->version,
 589                .authflavor     = flavor,
 590        };
 591
 592        if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
 593                args.flags |= RPC_CLNT_CREATE_DISCRTRY;
 594        if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
 595                args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
 596
 597        if (!IS_ERR(clp->cl_rpcclient))
 598                return 0;
 599
 600        clnt = rpc_create(&args);
 601        if (IS_ERR(clnt)) {
 602                dprintk("%s: cannot create RPC client. Error = %ld\n",
 603                                __func__, PTR_ERR(clnt));
 604                return PTR_ERR(clnt);
 605        }
 606
 607        clp->cl_rpcclient = clnt;
 608        return 0;
 609}
 610EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
 611
 612/*
 613 * Version 2 or 3 client destruction
 614 */
 615static void nfs_destroy_server(struct nfs_server *server)
 616{
 617        if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
 618                        !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
 619                nlmclnt_done(server->nlm_host);
 620}
 621
 622/*
 623 * Version 2 or 3 lockd setup
 624 */
 625static int nfs_start_lockd(struct nfs_server *server)
 626{
 627        struct nlm_host *host;
 628        struct nfs_client *clp = server->nfs_client;
 629        struct nlmclnt_initdata nlm_init = {
 630                .hostname       = clp->cl_hostname,
 631                .address        = (struct sockaddr *)&clp->cl_addr,
 632                .addrlen        = clp->cl_addrlen,
 633                .nfs_version    = clp->rpc_ops->version,
 634                .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
 635                                        1 : 0,
 636                .net            = clp->cl_net,
 637        };
 638
 639        if (nlm_init.nfs_version > 3)
 640                return 0;
 641        if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
 642                        (server->flags & NFS_MOUNT_LOCAL_FCNTL))
 643                return 0;
 644
 645        switch (clp->cl_proto) {
 646                default:
 647                        nlm_init.protocol = IPPROTO_TCP;
 648                        break;
 649                case XPRT_TRANSPORT_UDP:
 650                        nlm_init.protocol = IPPROTO_UDP;
 651        }
 652
 653        host = nlmclnt_init(&nlm_init);
 654        if (IS_ERR(host))
 655                return PTR_ERR(host);
 656
 657        server->nlm_host = host;
 658        server->destroy = nfs_destroy_server;
 659        return 0;
 660}
 661
 662/*
 663 * Create a general RPC client
 664 */
 665int nfs_init_server_rpcclient(struct nfs_server *server,
 666                const struct rpc_timeout *timeo,
 667                rpc_authflavor_t pseudoflavour)
 668{
 669        struct nfs_client *clp = server->nfs_client;
 670
 671        server->client = rpc_clone_client(clp->cl_rpcclient);
 672        if (IS_ERR(server->client)) {
 673                dprintk("%s: couldn't create rpc_client!\n", __func__);
 674                return PTR_ERR(server->client);
 675        }
 676
 677        memcpy(&server->client->cl_timeout_default,
 678                        timeo,
 679                        sizeof(server->client->cl_timeout_default));
 680        server->client->cl_timeout = &server->client->cl_timeout_default;
 681
 682        if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
 683                struct rpc_auth *auth;
 684
 685                auth = rpcauth_create(pseudoflavour, server->client);
 686                if (IS_ERR(auth)) {
 687                        dprintk("%s: couldn't create credcache!\n", __func__);
 688                        return PTR_ERR(auth);
 689                }
 690        }
 691        server->client->cl_softrtry = 0;
 692        if (server->flags & NFS_MOUNT_SOFT)
 693                server->client->cl_softrtry = 1;
 694
 695        return 0;
 696}
 697EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
 698
 699/**
 700 * nfs_init_client - Initialise an NFS2 or NFS3 client
 701 *
 702 * @clp: nfs_client to initialise
 703 * @timeparms: timeout parameters for underlying RPC transport
 704 * @ip_addr: IP presentation address (not used)
 705 * @authflavor: authentication flavor for underlying RPC transport
 706 *
 707 * Returns pointer to an NFS client, or an ERR_PTR value.
 708 */
 709struct nfs_client *nfs_init_client(struct nfs_client *clp,
 710                    const struct rpc_timeout *timeparms,
 711                    const char *ip_addr, rpc_authflavor_t authflavour)
 712{
 713        int error;
 714
 715        if (clp->cl_cons_state == NFS_CS_READY) {
 716                /* the client is already initialised */
 717                dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
 718                return clp;
 719        }
 720
 721        /*
 722         * Create a client RPC handle for doing FSSTAT with UNIX auth only
 723         * - RFC 2623, sec 2.3.2
 724         */
 725        error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
 726        if (error < 0)
 727                goto error;
 728        nfs_mark_client_ready(clp, NFS_CS_READY);
 729        return clp;
 730
 731error:
 732        nfs_mark_client_ready(clp, error);
 733        nfs_put_client(clp);
 734        dprintk("<-- nfs_init_client() = xerror %d\n", error);
 735        return ERR_PTR(error);
 736}
 737EXPORT_SYMBOL_GPL(nfs_init_client);
 738
 739/*
 740 * Create a version 2 or 3 client
 741 */
 742static int nfs_init_server(struct nfs_server *server,
 743                           const struct nfs_parsed_mount_data *data,
 744                           struct nfs_subversion *nfs_mod)
 745{
 746        struct nfs_client_initdata cl_init = {
 747                .hostname = data->nfs_server.hostname,
 748                .addr = (const struct sockaddr *)&data->nfs_server.address,
 749                .addrlen = data->nfs_server.addrlen,
 750                .nfs_mod = nfs_mod,
 751                .proto = data->nfs_server.protocol,
 752                .net = data->net,
 753        };
 754        struct rpc_timeout timeparms;
 755        struct nfs_client *clp;
 756        int error;
 757
 758        dprintk("--> nfs_init_server()\n");
 759
 760        nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 761                        data->timeo, data->retrans);
 762        if (data->flags & NFS_MOUNT_NORESVPORT)
 763                set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 764
 765        /* Allocate or find a client reference we can use */
 766        clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
 767        if (IS_ERR(clp)) {
 768                dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
 769                return PTR_ERR(clp);
 770        }
 771
 772        server->nfs_client = clp;
 773
 774        /* Initialise the client representation from the mount data */
 775        server->flags = data->flags;
 776        server->options = data->options;
 777        server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
 778                NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
 779                NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
 780
 781        if (data->rsize)
 782                server->rsize = nfs_block_size(data->rsize, NULL);
 783        if (data->wsize)
 784                server->wsize = nfs_block_size(data->wsize, NULL);
 785
 786        server->acregmin = data->acregmin * HZ;
 787        server->acregmax = data->acregmax * HZ;
 788        server->acdirmin = data->acdirmin * HZ;
 789        server->acdirmax = data->acdirmax * HZ;
 790
 791        /* Start lockd here, before we might error out */
 792        error = nfs_start_lockd(server);
 793        if (error < 0)
 794                goto error;
 795
 796        server->port = data->nfs_server.port;
 797
 798        error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 799        if (error < 0)
 800                goto error;
 801
 802        /* Preserve the values of mount_server-related mount options */
 803        if (data->mount_server.addrlen) {
 804                memcpy(&server->mountd_address, &data->mount_server.address,
 805                        data->mount_server.addrlen);
 806                server->mountd_addrlen = data->mount_server.addrlen;
 807        }
 808        server->mountd_version = data->mount_server.version;
 809        server->mountd_port = data->mount_server.port;
 810        server->mountd_protocol = data->mount_server.protocol;
 811
 812        server->namelen  = data->namlen;
 813        dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
 814        return 0;
 815
 816error:
 817        server->nfs_client = NULL;
 818        nfs_put_client(clp);
 819        dprintk("<-- nfs_init_server() = xerror %d\n", error);
 820        return error;
 821}
 822
 823/*
 824 * Load up the server record from information gained in an fsinfo record
 825 */
 826static void nfs_server_set_fsinfo(struct nfs_server *server,
 827                                  struct nfs_fh *mntfh,
 828                                  struct nfs_fsinfo *fsinfo)
 829{
 830        unsigned long max_rpc_payload;
 831
 832        /* Work out a lot of parameters */
 833        if (server->rsize == 0)
 834                server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
 835        if (server->wsize == 0)
 836                server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
 837
 838        if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
 839                server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
 840        if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
 841                server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
 842
 843        max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
 844        if (server->rsize > max_rpc_payload)
 845                server->rsize = max_rpc_payload;
 846        if (server->rsize > NFS_MAX_FILE_IO_SIZE)
 847                server->rsize = NFS_MAX_FILE_IO_SIZE;
 848        server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 849
 850        server->backing_dev_info.name = "nfs";
 851        server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
 852
 853        if (server->wsize > max_rpc_payload)
 854                server->wsize = max_rpc_payload;
 855        if (server->wsize > NFS_MAX_FILE_IO_SIZE)
 856                server->wsize = NFS_MAX_FILE_IO_SIZE;
 857        server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 858        server->pnfs_blksize = fsinfo->blksize;
 859
 860        server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
 861
 862        server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
 863        if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
 864                server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
 865        if (server->dtsize > server->rsize)
 866                server->dtsize = server->rsize;
 867
 868        if (server->flags & NFS_MOUNT_NOAC) {
 869                server->acregmin = server->acregmax = 0;
 870                server->acdirmin = server->acdirmax = 0;
 871        }
 872
 873        server->maxfilesize = fsinfo->maxfilesize;
 874
 875        server->time_delta = fsinfo->time_delta;
 876
 877        /* We're airborne Set socket buffersize */
 878        rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
 879}
 880
 881/*
 882 * Probe filesystem information, including the FSID on v2/v3
 883 */
 884int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
 885{
 886        struct nfs_fsinfo fsinfo;
 887        struct nfs_client *clp = server->nfs_client;
 888        int error;
 889
 890        dprintk("--> nfs_probe_fsinfo()\n");
 891
 892        if (clp->rpc_ops->set_capabilities != NULL) {
 893                error = clp->rpc_ops->set_capabilities(server, mntfh);
 894                if (error < 0)
 895                        goto out_error;
 896        }
 897
 898        fsinfo.fattr = fattr;
 899        fsinfo.layouttype = 0;
 900        error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
 901        if (error < 0)
 902                goto out_error;
 903
 904        nfs_server_set_fsinfo(server, mntfh, &fsinfo);
 905
 906        /* Get some general file system info */
 907        if (server->namelen == 0) {
 908                struct nfs_pathconf pathinfo;
 909
 910                pathinfo.fattr = fattr;
 911                nfs_fattr_init(fattr);
 912
 913                if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
 914                        server->namelen = pathinfo.max_namelen;
 915        }
 916
 917        dprintk("<-- nfs_probe_fsinfo() = 0\n");
 918        return 0;
 919
 920out_error:
 921        dprintk("nfs_probe_fsinfo: error = %d\n", -error);
 922        return error;
 923}
 924EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
 925
 926/*
 927 * Copy useful information when duplicating a server record
 928 */
 929void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
 930{
 931        target->flags = source->flags;
 932        target->rsize = source->rsize;
 933        target->wsize = source->wsize;
 934        target->acregmin = source->acregmin;
 935        target->acregmax = source->acregmax;
 936        target->acdirmin = source->acdirmin;
 937        target->acdirmax = source->acdirmax;
 938        target->caps = source->caps;
 939        target->options = source->options;
 940}
 941EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
 942
 943void nfs_server_insert_lists(struct nfs_server *server)
 944{
 945        struct nfs_client *clp = server->nfs_client;
 946        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
 947
 948        spin_lock(&nn->nfs_client_lock);
 949        list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
 950        list_add_tail(&server->master_link, &nn->nfs_volume_list);
 951        clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
 952        spin_unlock(&nn->nfs_client_lock);
 953
 954}
 955EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
 956
 957static void nfs_server_remove_lists(struct nfs_server *server)
 958{
 959        struct nfs_client *clp = server->nfs_client;
 960        struct nfs_net *nn;
 961
 962        if (clp == NULL)
 963                return;
 964        nn = net_generic(clp->cl_net, nfs_net_id);
 965        spin_lock(&nn->nfs_client_lock);
 966        list_del_rcu(&server->client_link);
 967        if (list_empty(&clp->cl_superblocks))
 968                set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
 969        list_del(&server->master_link);
 970        spin_unlock(&nn->nfs_client_lock);
 971
 972        synchronize_rcu();
 973}
 974
 975/*
 976 * Allocate and initialise a server record
 977 */
 978struct nfs_server *nfs_alloc_server(void)
 979{
 980        struct nfs_server *server;
 981
 982        server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
 983        if (!server)
 984                return NULL;
 985
 986        server->client = server->client_acl = ERR_PTR(-EINVAL);
 987
 988        /* Zero out the NFS state stuff */
 989        INIT_LIST_HEAD(&server->client_link);
 990        INIT_LIST_HEAD(&server->master_link);
 991        INIT_LIST_HEAD(&server->delegations);
 992        INIT_LIST_HEAD(&server->layouts);
 993        INIT_LIST_HEAD(&server->state_owners_lru);
 994
 995        atomic_set(&server->active, 0);
 996
 997        server->io_stats = nfs_alloc_iostats();
 998        if (!server->io_stats) {
 999                kfree(server);
1000                return NULL;
1001        }
1002
1003        if (bdi_init(&server->backing_dev_info)) {
1004                nfs_free_iostats(server->io_stats);
1005                kfree(server);
1006                return NULL;
1007        }
1008
1009        ida_init(&server->openowner_id);
1010        ida_init(&server->lockowner_id);
1011        pnfs_init_server(server);
1012
1013        return server;
1014}
1015EXPORT_SYMBOL_GPL(nfs_alloc_server);
1016
1017/*
1018 * Free up a server record
1019 */
1020void nfs_free_server(struct nfs_server *server)
1021{
1022        dprintk("--> nfs_free_server()\n");
1023
1024        nfs_server_remove_lists(server);
1025
1026        if (server->destroy != NULL)
1027                server->destroy(server);
1028
1029        if (!IS_ERR(server->client_acl))
1030                rpc_shutdown_client(server->client_acl);
1031        if (!IS_ERR(server->client))
1032                rpc_shutdown_client(server->client);
1033
1034        nfs_put_client(server->nfs_client);
1035
1036        ida_destroy(&server->lockowner_id);
1037        ida_destroy(&server->openowner_id);
1038        nfs_free_iostats(server->io_stats);
1039        bdi_destroy(&server->backing_dev_info);
1040        kfree(server);
1041        nfs_release_automount_timer();
1042        dprintk("<-- nfs_free_server()\n");
1043}
1044EXPORT_SYMBOL_GPL(nfs_free_server);
1045
1046/*
1047 * Create a version 2 or 3 volume record
1048 * - keyed on server and FSID
1049 */
1050struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
1051                                     struct nfs_subversion *nfs_mod)
1052{
1053        struct nfs_server *server;
1054        struct nfs_fattr *fattr;
1055        int error;
1056
1057        server = nfs_alloc_server();
1058        if (!server)
1059                return ERR_PTR(-ENOMEM);
1060
1061        error = -ENOMEM;
1062        fattr = nfs_alloc_fattr();
1063        if (fattr == NULL)
1064                goto error;
1065
1066        /* Get a client representation */
1067        error = nfs_init_server(server, mount_info->parsed, nfs_mod);
1068        if (error < 0)
1069                goto error;
1070
1071        BUG_ON(!server->nfs_client);
1072        BUG_ON(!server->nfs_client->rpc_ops);
1073        BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1074
1075        /* Probe the root fh to retrieve its FSID */
1076        error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
1077        if (error < 0)
1078                goto error;
1079        if (server->nfs_client->rpc_ops->version == 3) {
1080                if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1081                        server->namelen = NFS3_MAXNAMLEN;
1082                if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
1083                        server->caps |= NFS_CAP_READDIRPLUS;
1084        } else {
1085                if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1086                        server->namelen = NFS2_MAXNAMLEN;
1087        }
1088
1089        if (!(fattr->valid & NFS_ATTR_FATTR)) {
1090                error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr);
1091                if (error < 0) {
1092                        dprintk("nfs_create_server: getattr error = %d\n", -error);
1093                        goto error;
1094                }
1095        }
1096        memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1097
1098        dprintk("Server FSID: %llx:%llx\n",
1099                (unsigned long long) server->fsid.major,
1100                (unsigned long long) server->fsid.minor);
1101
1102        nfs_server_insert_lists(server);
1103        server->mount_time = jiffies;
1104        nfs_free_fattr(fattr);
1105        return server;
1106
1107error:
1108        nfs_free_fattr(fattr);
1109        nfs_free_server(server);
1110        return ERR_PTR(error);
1111}
1112EXPORT_SYMBOL_GPL(nfs_create_server);
1113
1114/*
1115 * Clone an NFS2, NFS3 or NFS4 server record
1116 */
1117struct nfs_server *nfs_clone_server(struct nfs_server *source,
1118                                    struct nfs_fh *fh,
1119                                    struct nfs_fattr *fattr,
1120                                    rpc_authflavor_t flavor)
1121{
1122        struct nfs_server *server;
1123        struct nfs_fattr *fattr_fsinfo;
1124        int error;
1125
1126        dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1127                (unsigned long long) fattr->fsid.major,
1128                (unsigned long long) fattr->fsid.minor);
1129
1130        server = nfs_alloc_server();
1131        if (!server)
1132                return ERR_PTR(-ENOMEM);
1133
1134        error = -ENOMEM;
1135        fattr_fsinfo = nfs_alloc_fattr();
1136        if (fattr_fsinfo == NULL)
1137                goto out_free_server;
1138
1139        /* Copy data from the source */
1140        server->nfs_client = source->nfs_client;
1141        server->destroy = source->destroy;
1142        atomic_inc(&server->nfs_client->cl_count);
1143        nfs_server_copy_userdata(server, source);
1144
1145        server->fsid = fattr->fsid;
1146
1147        error = nfs_init_server_rpcclient(server,
1148                        source->client->cl_timeout,
1149                        flavor);
1150        if (error < 0)
1151                goto out_free_server;
1152
1153        /* probe the filesystem info for this server filesystem */
1154        error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1155        if (error < 0)
1156                goto out_free_server;
1157
1158        if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1159                server->namelen = NFS4_MAXNAMLEN;
1160
1161        dprintk("Cloned FSID: %llx:%llx\n",
1162                (unsigned long long) server->fsid.major,
1163                (unsigned long long) server->fsid.minor);
1164
1165        error = nfs_start_lockd(server);
1166        if (error < 0)
1167                goto out_free_server;
1168
1169        nfs_server_insert_lists(server);
1170        server->mount_time = jiffies;
1171
1172        nfs_free_fattr(fattr_fsinfo);
1173        dprintk("<-- nfs_clone_server() = %p\n", server);
1174        return server;
1175
1176out_free_server:
1177        nfs_free_fattr(fattr_fsinfo);
1178        nfs_free_server(server);
1179        dprintk("<-- nfs_clone_server() = error %d\n", error);
1180        return ERR_PTR(error);
1181}
1182EXPORT_SYMBOL_GPL(nfs_clone_server);
1183
1184void nfs_clients_init(struct net *net)
1185{
1186        struct nfs_net *nn = net_generic(net, nfs_net_id);
1187
1188        INIT_LIST_HEAD(&nn->nfs_client_list);
1189        INIT_LIST_HEAD(&nn->nfs_volume_list);
1190#if IS_ENABLED(CONFIG_NFS_V4)
1191        idr_init(&nn->cb_ident_idr);
1192#endif
1193        spin_lock_init(&nn->nfs_client_lock);
1194        nn->boot_time = CURRENT_TIME;
1195}
1196
1197#ifdef CONFIG_PROC_FS
1198static struct proc_dir_entry *proc_fs_nfs;
1199
1200static int nfs_server_list_open(struct inode *inode, struct file *file);
1201static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1202static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1203static void nfs_server_list_stop(struct seq_file *p, void *v);
1204static int nfs_server_list_show(struct seq_file *m, void *v);
1205
1206static const struct seq_operations nfs_server_list_ops = {
1207        .start  = nfs_server_list_start,
1208        .next   = nfs_server_list_next,
1209        .stop   = nfs_server_list_stop,
1210        .show   = nfs_server_list_show,
1211};
1212
1213static const struct file_operations nfs_server_list_fops = {
1214        .open           = nfs_server_list_open,
1215        .read           = seq_read,
1216        .llseek         = seq_lseek,
1217        .release        = seq_release,
1218        .owner          = THIS_MODULE,
1219};
1220
1221static int nfs_volume_list_open(struct inode *inode, struct file *file);
1222static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1223static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1224static void nfs_volume_list_stop(struct seq_file *p, void *v);
1225static int nfs_volume_list_show(struct seq_file *m, void *v);
1226
1227static const struct seq_operations nfs_volume_list_ops = {
1228        .start  = nfs_volume_list_start,
1229        .next   = nfs_volume_list_next,
1230        .stop   = nfs_volume_list_stop,
1231        .show   = nfs_volume_list_show,
1232};
1233
1234static const struct file_operations nfs_volume_list_fops = {
1235        .open           = nfs_volume_list_open,
1236        .read           = seq_read,
1237        .llseek         = seq_lseek,
1238        .release        = seq_release,
1239        .owner          = THIS_MODULE,
1240};
1241
1242/*
1243 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1244 * we're dealing
1245 */
1246static int nfs_server_list_open(struct inode *inode, struct file *file)
1247{
1248        struct seq_file *m;
1249        int ret;
1250        struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1251        struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1252
1253        ret = seq_open(file, &nfs_server_list_ops);
1254        if (ret < 0)
1255                return ret;
1256
1257        m = file->private_data;
1258        m->private = net;
1259
1260        return 0;
1261}
1262
1263/*
1264 * set up the iterator to start reading from the server list and return the first item
1265 */
1266static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1267{
1268        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1269
1270        /* lock the list against modification */
1271        spin_lock(&nn->nfs_client_lock);
1272        return seq_list_start_head(&nn->nfs_client_list, *_pos);
1273}
1274
1275/*
1276 * move to next server
1277 */
1278static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1279{
1280        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1281
1282        return seq_list_next(v, &nn->nfs_client_list, pos);
1283}
1284
1285/*
1286 * clean up after reading from the transports list
1287 */
1288static void nfs_server_list_stop(struct seq_file *p, void *v)
1289{
1290        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1291
1292        spin_unlock(&nn->nfs_client_lock);
1293}
1294
1295/*
1296 * display a header line followed by a load of call lines
1297 */
1298static int nfs_server_list_show(struct seq_file *m, void *v)
1299{
1300        struct nfs_client *clp;
1301        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1302
1303        /* display header on line 1 */
1304        if (v == &nn->nfs_client_list) {
1305                seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1306                return 0;
1307        }
1308
1309        /* display one transport per line on subsequent lines */
1310        clp = list_entry(v, struct nfs_client, cl_share_link);
1311
1312        /* Check if the client is initialized */
1313        if (clp->cl_cons_state != NFS_CS_READY)
1314                return 0;
1315
1316        rcu_read_lock();
1317        seq_printf(m, "v%u %s %s %3d %s\n",
1318                   clp->rpc_ops->version,
1319                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1320                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1321                   atomic_read(&clp->cl_count),
1322                   clp->cl_hostname);
1323        rcu_read_unlock();
1324
1325        return 0;
1326}
1327
1328/*
1329 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1330 */
1331static int nfs_volume_list_open(struct inode *inode, struct file *file)
1332{
1333        struct seq_file *m;
1334        int ret;
1335        struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1336        struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1337
1338        ret = seq_open(file, &nfs_volume_list_ops);
1339        if (ret < 0)
1340                return ret;
1341
1342        m = file->private_data;
1343        m->private = net;
1344
1345        return 0;
1346}
1347
1348/*
1349 * set up the iterator to start reading from the volume list and return the first item
1350 */
1351static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1352{
1353        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1354
1355        /* lock the list against modification */
1356        spin_lock(&nn->nfs_client_lock);
1357        return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1358}
1359
1360/*
1361 * move to next volume
1362 */
1363static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1364{
1365        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1366
1367        return seq_list_next(v, &nn->nfs_volume_list, pos);
1368}
1369
1370/*
1371 * clean up after reading from the transports list
1372 */
1373static void nfs_volume_list_stop(struct seq_file *p, void *v)
1374{
1375        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1376
1377        spin_unlock(&nn->nfs_client_lock);
1378}
1379
1380/*
1381 * display a header line followed by a load of call lines
1382 */
1383static int nfs_volume_list_show(struct seq_file *m, void *v)
1384{
1385        struct nfs_server *server;
1386        struct nfs_client *clp;
1387        char dev[8], fsid[17];
1388        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1389
1390        /* display header on line 1 */
1391        if (v == &nn->nfs_volume_list) {
1392                seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1393                return 0;
1394        }
1395        /* display one transport per line on subsequent lines */
1396        server = list_entry(v, struct nfs_server, master_link);
1397        clp = server->nfs_client;
1398
1399        snprintf(dev, 8, "%u:%u",
1400                 MAJOR(server->s_dev), MINOR(server->s_dev));
1401
1402        snprintf(fsid, 17, "%llx:%llx",
1403                 (unsigned long long) server->fsid.major,
1404                 (unsigned long long) server->fsid.minor);
1405
1406        rcu_read_lock();
1407        seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1408                   clp->rpc_ops->version,
1409                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1410                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1411                   dev,
1412                   fsid,
1413                   nfs_server_fscache_state(server));
1414        rcu_read_unlock();
1415
1416        return 0;
1417}
1418
1419/*
1420 * initialise the /proc/fs/nfsfs/ directory
1421 */
1422int __init nfs_fs_proc_init(void)
1423{
1424        struct proc_dir_entry *p;
1425
1426        proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1427        if (!proc_fs_nfs)
1428                goto error_0;
1429
1430        /* a file of servers with which we're dealing */
1431        p = proc_create("servers", S_IFREG|S_IRUGO,
1432                        proc_fs_nfs, &nfs_server_list_fops);
1433        if (!p)
1434                goto error_1;
1435
1436        /* a file of volumes that we have mounted */
1437        p = proc_create("volumes", S_IFREG|S_IRUGO,
1438                        proc_fs_nfs, &nfs_volume_list_fops);
1439        if (!p)
1440                goto error_2;
1441        return 0;
1442
1443error_2:
1444        remove_proc_entry("servers", proc_fs_nfs);
1445error_1:
1446        remove_proc_entry("fs/nfsfs", NULL);
1447error_0:
1448        return -ENOMEM;
1449}
1450
1451/*
1452 * clean up the /proc/fs/nfsfs/ directory
1453 */
1454void nfs_fs_proc_exit(void)
1455{
1456        remove_proc_entry("volumes", proc_fs_nfs);
1457        remove_proc_entry("servers", proc_fs_nfs);
1458        remove_proc_entry("fs/nfsfs", NULL);
1459}
1460
1461#endif /* CONFIG_PROC_FS */
1462
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