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_tail(&new->cl_share_link,
 502                                        &nn->nfs_client_list);
 503                        spin_unlock(&nn->nfs_client_lock);
 504                        new->cl_flags = cl_init->init_flags;
 505                        return rpc_ops->init_client(new, timeparms, ip_addr,
 506                                                    authflavour);
 507                }
 508
 509                spin_unlock(&nn->nfs_client_lock);
 510
 511                new = rpc_ops->alloc_client(cl_init);
 512        } while (!IS_ERR(new));
 513
 514        dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
 515                cl_init->hostname ?: "", PTR_ERR(new));
 516        return new;
 517}
 518EXPORT_SYMBOL_GPL(nfs_get_client);
 519
 520/*
 521 * Mark a server as ready or failed
 522 */
 523void nfs_mark_client_ready(struct nfs_client *clp, int state)
 524{
 525        smp_wmb();
 526        clp->cl_cons_state = state;
 527        wake_up_all(&nfs_client_active_wq);
 528}
 529EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
 530
 531/*
 532 * Initialise the timeout values for a connection
 533 */
 534void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
 535                                    unsigned int timeo, unsigned int retrans)
 536{
 537        to->to_initval = timeo * HZ / 10;
 538        to->to_retries = retrans;
 539
 540        switch (proto) {
 541        case XPRT_TRANSPORT_TCP:
 542        case XPRT_TRANSPORT_RDMA:
 543                if (to->to_retries == 0)
 544                        to->to_retries = NFS_DEF_TCP_RETRANS;
 545                if (to->to_initval == 0)
 546                        to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
 547                if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
 548                        to->to_initval = NFS_MAX_TCP_TIMEOUT;
 549                to->to_increment = to->to_initval;
 550                to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
 551                if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
 552                        to->to_maxval = NFS_MAX_TCP_TIMEOUT;
 553                if (to->to_maxval < to->to_initval)
 554                        to->to_maxval = to->to_initval;
 555                to->to_exponential = 0;
 556                break;
 557        case XPRT_TRANSPORT_UDP:
 558                if (to->to_retries == 0)
 559                        to->to_retries = NFS_DEF_UDP_RETRANS;
 560                if (!to->to_initval)
 561                        to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
 562                if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
 563                        to->to_initval = NFS_MAX_UDP_TIMEOUT;
 564                to->to_maxval = NFS_MAX_UDP_TIMEOUT;
 565                to->to_exponential = 1;
 566                break;
 567        default:
 568                BUG();
 569        }
 570}
 571EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
 572
 573/*
 574 * Create an RPC client handle
 575 */
 576int nfs_create_rpc_client(struct nfs_client *clp,
 577                          const struct rpc_timeout *timeparms,
 578                          rpc_authflavor_t flavor)
 579{
 580        struct rpc_clnt         *clnt = NULL;
 581        struct rpc_create_args args = {
 582                .net            = clp->cl_net,
 583                .protocol       = clp->cl_proto,
 584                .address        = (struct sockaddr *)&clp->cl_addr,
 585                .addrsize       = clp->cl_addrlen,
 586                .timeout        = timeparms,
 587                .servername     = clp->cl_hostname,
 588                .program        = &nfs_program,
 589                .version        = clp->rpc_ops->version,
 590                .authflavor     = flavor,
 591        };
 592
 593        if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
 594                args.flags |= RPC_CLNT_CREATE_DISCRTRY;
 595        if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
 596                args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
 597
 598        if (!IS_ERR(clp->cl_rpcclient))
 599                return 0;
 600
 601        clnt = rpc_create(&args);
 602        if (IS_ERR(clnt)) {
 603                dprintk("%s: cannot create RPC client. Error = %ld\n",
 604                                __func__, PTR_ERR(clnt));
 605                return PTR_ERR(clnt);
 606        }
 607
 608        clp->cl_rpcclient = clnt;
 609        return 0;
 610}
 611EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
 612
 613/*
 614 * Version 2 or 3 client destruction
 615 */
 616static void nfs_destroy_server(struct nfs_server *server)
 617{
 618        if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
 619                        !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
 620                nlmclnt_done(server->nlm_host);
 621}
 622
 623/*
 624 * Version 2 or 3 lockd setup
 625 */
 626static int nfs_start_lockd(struct nfs_server *server)
 627{
 628        struct nlm_host *host;
 629        struct nfs_client *clp = server->nfs_client;
 630        struct nlmclnt_initdata nlm_init = {
 631                .hostname       = clp->cl_hostname,
 632                .address        = (struct sockaddr *)&clp->cl_addr,
 633                .addrlen        = clp->cl_addrlen,
 634                .nfs_version    = clp->rpc_ops->version,
 635                .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
 636                                        1 : 0,
 637                .net            = clp->cl_net,
 638        };
 639
 640        if (nlm_init.nfs_version > 3)
 641                return 0;
 642        if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
 643                        (server->flags & NFS_MOUNT_LOCAL_FCNTL))
 644                return 0;
 645
 646        switch (clp->cl_proto) {
 647                default:
 648                        nlm_init.protocol = IPPROTO_TCP;
 649                        break;
 650                case XPRT_TRANSPORT_UDP:
 651                        nlm_init.protocol = IPPROTO_UDP;
 652        }
 653
 654        host = nlmclnt_init(&nlm_init);
 655        if (IS_ERR(host))
 656                return PTR_ERR(host);
 657
 658        server->nlm_host = host;
 659        server->destroy = nfs_destroy_server;
 660        return 0;
 661}
 662
 663/*
 664 * Create a general RPC client
 665 */
 666int nfs_init_server_rpcclient(struct nfs_server *server,
 667                const struct rpc_timeout *timeo,
 668                rpc_authflavor_t pseudoflavour)
 669{
 670        struct nfs_client *clp = server->nfs_client;
 671
 672        server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
 673                                                        pseudoflavour);
 674        if (IS_ERR(server->client)) {
 675                dprintk("%s: couldn't create rpc_client!\n", __func__);
 676                return PTR_ERR(server->client);
 677        }
 678
 679        memcpy(&server->client->cl_timeout_default,
 680                        timeo,
 681                        sizeof(server->client->cl_timeout_default));
 682        server->client->cl_timeout = &server->client->cl_timeout_default;
 683        server->client->cl_softrtry = 0;
 684        if (server->flags & NFS_MOUNT_SOFT)
 685                server->client->cl_softrtry = 1;
 686
 687        return 0;
 688}
 689EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
 690
 691/**
 692 * nfs_init_client - Initialise an NFS2 or NFS3 client
 693 *
 694 * @clp: nfs_client to initialise
 695 * @timeparms: timeout parameters for underlying RPC transport
 696 * @ip_addr: IP presentation address (not used)
 697 * @authflavor: authentication flavor for underlying RPC transport
 698 *
 699 * Returns pointer to an NFS client, or an ERR_PTR value.
 700 */
 701struct nfs_client *nfs_init_client(struct nfs_client *clp,
 702                    const struct rpc_timeout *timeparms,
 703                    const char *ip_addr, rpc_authflavor_t authflavour)
 704{
 705        int error;
 706
 707        if (clp->cl_cons_state == NFS_CS_READY) {
 708                /* the client is already initialised */
 709                dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
 710                return clp;
 711        }
 712
 713        /*
 714         * Create a client RPC handle for doing FSSTAT with UNIX auth only
 715         * - RFC 2623, sec 2.3.2
 716         */
 717        error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
 718        if (error < 0)
 719                goto error;
 720        nfs_mark_client_ready(clp, NFS_CS_READY);
 721        return clp;
 722
 723error:
 724        nfs_mark_client_ready(clp, error);
 725        nfs_put_client(clp);
 726        dprintk("<-- nfs_init_client() = xerror %d\n", error);
 727        return ERR_PTR(error);
 728}
 729EXPORT_SYMBOL_GPL(nfs_init_client);
 730
 731/*
 732 * Create a version 2 or 3 client
 733 */
 734static int nfs_init_server(struct nfs_server *server,
 735                           const struct nfs_parsed_mount_data *data,
 736                           struct nfs_subversion *nfs_mod)
 737{
 738        struct nfs_client_initdata cl_init = {
 739                .hostname = data->nfs_server.hostname,
 740                .addr = (const struct sockaddr *)&data->nfs_server.address,
 741                .addrlen = data->nfs_server.addrlen,
 742                .nfs_mod = nfs_mod,
 743                .proto = data->nfs_server.protocol,
 744                .net = data->net,
 745        };
 746        struct rpc_timeout timeparms;
 747        struct nfs_client *clp;
 748        int error;
 749
 750        dprintk("--> nfs_init_server()\n");
 751
 752        nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 753                        data->timeo, data->retrans);
 754        if (data->flags & NFS_MOUNT_NORESVPORT)
 755                set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 756        if (server->options & NFS_OPTION_MIGRATION)
 757                set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
 758
 759        /* Allocate or find a client reference we can use */
 760        clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
 761        if (IS_ERR(clp)) {
 762                dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
 763                return PTR_ERR(clp);
 764        }
 765
 766        server->nfs_client = clp;
 767
 768        /* Initialise the client representation from the mount data */
 769        server->flags = data->flags;
 770        server->options = data->options;
 771        server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
 772                NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
 773                NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
 774
 775        if (data->rsize)
 776                server->rsize = nfs_block_size(data->rsize, NULL);
 777        if (data->wsize)
 778                server->wsize = nfs_block_size(data->wsize, NULL);
 779
 780        server->acregmin = data->acregmin * HZ;
 781        server->acregmax = data->acregmax * HZ;
 782        server->acdirmin = data->acdirmin * HZ;
 783        server->acdirmax = data->acdirmax * HZ;
 784
 785        /* Start lockd here, before we might error out */
 786        error = nfs_start_lockd(server);
 787        if (error < 0)
 788                goto error;
 789
 790        server->port = data->nfs_server.port;
 791
 792        error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 793        if (error < 0)
 794                goto error;
 795
 796        /* Preserve the values of mount_server-related mount options */
 797        if (data->mount_server.addrlen) {
 798                memcpy(&server->mountd_address, &data->mount_server.address,
 799                        data->mount_server.addrlen);
 800                server->mountd_addrlen = data->mount_server.addrlen;
 801        }
 802        server->mountd_version = data->mount_server.version;
 803        server->mountd_port = data->mount_server.port;
 804        server->mountd_protocol = data->mount_server.protocol;
 805
 806        server->namelen  = data->namlen;
 807        dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
 808        return 0;
 809
 810error:
 811        server->nfs_client = NULL;
 812        nfs_put_client(clp);
 813        dprintk("<-- nfs_init_server() = xerror %d\n", error);
 814        return error;
 815}
 816
 817/*
 818 * Load up the server record from information gained in an fsinfo record
 819 */
 820static void nfs_server_set_fsinfo(struct nfs_server *server,
 821                                  struct nfs_fh *mntfh,
 822                                  struct nfs_fsinfo *fsinfo)
 823{
 824        unsigned long max_rpc_payload;
 825
 826        /* Work out a lot of parameters */
 827        if (server->rsize == 0)
 828                server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
 829        if (server->wsize == 0)
 830                server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
 831
 832        if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
 833                server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
 834        if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
 835                server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
 836
 837        max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
 838        if (server->rsize > max_rpc_payload)
 839                server->rsize = max_rpc_payload;
 840        if (server->rsize > NFS_MAX_FILE_IO_SIZE)
 841                server->rsize = NFS_MAX_FILE_IO_SIZE;
 842        server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 843
 844        server->backing_dev_info.name = "nfs";
 845        server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
 846
 847        if (server->wsize > max_rpc_payload)
 848                server->wsize = max_rpc_payload;
 849        if (server->wsize > NFS_MAX_FILE_IO_SIZE)
 850                server->wsize = NFS_MAX_FILE_IO_SIZE;
 851        server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 852
 853        server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
 854
 855        server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
 856        if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
 857                server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
 858        if (server->dtsize > server->rsize)
 859                server->dtsize = server->rsize;
 860
 861        if (server->flags & NFS_MOUNT_NOAC) {
 862                server->acregmin = server->acregmax = 0;
 863                server->acdirmin = server->acdirmax = 0;
 864        }
 865
 866        server->maxfilesize = fsinfo->maxfilesize;
 867
 868        server->time_delta = fsinfo->time_delta;
 869
 870        /* We're airborne Set socket buffersize */
 871        rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
 872}
 873
 874/*
 875 * Probe filesystem information, including the FSID on v2/v3
 876 */
 877int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
 878{
 879        struct nfs_fsinfo fsinfo;
 880        struct nfs_client *clp = server->nfs_client;
 881        int error;
 882
 883        dprintk("--> nfs_probe_fsinfo()\n");
 884
 885        if (clp->rpc_ops->set_capabilities != NULL) {
 886                error = clp->rpc_ops->set_capabilities(server, mntfh);
 887                if (error < 0)
 888                        goto out_error;
 889        }
 890
 891        fsinfo.fattr = fattr;
 892        fsinfo.layouttype = 0;
 893        error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
 894        if (error < 0)
 895                goto out_error;
 896
 897        nfs_server_set_fsinfo(server, mntfh, &fsinfo);
 898
 899        /* Get some general file system info */
 900        if (server->namelen == 0) {
 901                struct nfs_pathconf pathinfo;
 902
 903                pathinfo.fattr = fattr;
 904                nfs_fattr_init(fattr);
 905
 906                if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
 907                        server->namelen = pathinfo.max_namelen;
 908        }
 909
 910        dprintk("<-- nfs_probe_fsinfo() = 0\n");
 911        return 0;
 912
 913out_error:
 914        dprintk("nfs_probe_fsinfo: error = %d\n", -error);
 915        return error;
 916}
 917EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
 918
 919/*
 920 * Copy useful information when duplicating a server record
 921 */
 922void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
 923{
 924        target->flags = source->flags;
 925        target->rsize = source->rsize;
 926        target->wsize = source->wsize;
 927        target->acregmin = source->acregmin;
 928        target->acregmax = source->acregmax;
 929        target->acdirmin = source->acdirmin;
 930        target->acdirmax = source->acdirmax;
 931        target->caps = source->caps;
 932        target->options = source->options;
 933}
 934EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
 935
 936void nfs_server_insert_lists(struct nfs_server *server)
 937{
 938        struct nfs_client *clp = server->nfs_client;
 939        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
 940
 941        spin_lock(&nn->nfs_client_lock);
 942        list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
 943        list_add_tail(&server->master_link, &nn->nfs_volume_list);
 944        clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
 945        spin_unlock(&nn->nfs_client_lock);
 946
 947}
 948EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
 949
 950static void nfs_server_remove_lists(struct nfs_server *server)
 951{
 952        struct nfs_client *clp = server->nfs_client;
 953        struct nfs_net *nn;
 954
 955        if (clp == NULL)
 956                return;
 957        nn = net_generic(clp->cl_net, nfs_net_id);
 958        spin_lock(&nn->nfs_client_lock);
 959        list_del_rcu(&server->client_link);
 960        if (list_empty(&clp->cl_superblocks))
 961                set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
 962        list_del(&server->master_link);
 963        spin_unlock(&nn->nfs_client_lock);
 964
 965        synchronize_rcu();
 966}
 967
 968/*
 969 * Allocate and initialise a server record
 970 */
 971struct nfs_server *nfs_alloc_server(void)
 972{
 973        struct nfs_server *server;
 974
 975        server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
 976        if (!server)
 977                return NULL;
 978
 979        server->client = server->client_acl = ERR_PTR(-EINVAL);
 980
 981        /* Zero out the NFS state stuff */
 982        INIT_LIST_HEAD(&server->client_link);
 983        INIT_LIST_HEAD(&server->master_link);
 984        INIT_LIST_HEAD(&server->delegations);
 985        INIT_LIST_HEAD(&server->layouts);
 986        INIT_LIST_HEAD(&server->state_owners_lru);
 987
 988        atomic_set(&server->active, 0);
 989
 990        server->io_stats = nfs_alloc_iostats();
 991        if (!server->io_stats) {
 992                kfree(server);
 993                return NULL;
 994        }
 995
 996        if (bdi_init(&server->backing_dev_info)) {
 997                nfs_free_iostats(server->io_stats);
 998                kfree(server);
 999                return NULL;
1000        }
1001
1002        ida_init(&server->openowner_id);
1003        ida_init(&server->lockowner_id);
1004        pnfs_init_server(server);
1005
1006        return server;
1007}
1008EXPORT_SYMBOL_GPL(nfs_alloc_server);
1009
1010/*
1011 * Free up a server record
1012 */
1013void nfs_free_server(struct nfs_server *server)
1014{
1015        dprintk("--> nfs_free_server()\n");
1016
1017        nfs_server_remove_lists(server);
1018
1019        if (server->destroy != NULL)
1020                server->destroy(server);
1021
1022        if (!IS_ERR(server->client_acl))
1023                rpc_shutdown_client(server->client_acl);
1024        if (!IS_ERR(server->client))
1025                rpc_shutdown_client(server->client);
1026
1027        nfs_put_client(server->nfs_client);
1028
1029        ida_destroy(&server->lockowner_id);
1030        ida_destroy(&server->openowner_id);
1031        nfs_free_iostats(server->io_stats);
1032        bdi_destroy(&server->backing_dev_info);
1033        kfree(server);
1034        nfs_release_automount_timer();
1035        dprintk("<-- nfs_free_server()\n");
1036}
1037EXPORT_SYMBOL_GPL(nfs_free_server);
1038
1039/*
1040 * Create a version 2 or 3 volume record
1041 * - keyed on server and FSID
1042 */
1043struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
1044                                     struct nfs_subversion *nfs_mod)
1045{
1046        struct nfs_server *server;
1047        struct nfs_fattr *fattr;
1048        int error;
1049
1050        server = nfs_alloc_server();
1051        if (!server)
1052                return ERR_PTR(-ENOMEM);
1053
1054        error = -ENOMEM;
1055        fattr = nfs_alloc_fattr();
1056        if (fattr == NULL)
1057                goto error;
1058
1059        /* Get a client representation */
1060        error = nfs_init_server(server, mount_info->parsed, nfs_mod);
1061        if (error < 0)
1062                goto error;
1063
1064        BUG_ON(!server->nfs_client);
1065        BUG_ON(!server->nfs_client->rpc_ops);
1066        BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1067
1068        /* Probe the root fh to retrieve its FSID */
1069        error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
1070        if (error < 0)
1071                goto error;
1072        if (server->nfs_client->rpc_ops->version == 3) {
1073                if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1074                        server->namelen = NFS3_MAXNAMLEN;
1075                if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
1076                        server->caps |= NFS_CAP_READDIRPLUS;
1077        } else {
1078                if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1079                        server->namelen = NFS2_MAXNAMLEN;
1080        }
1081
1082        if (!(fattr->valid & NFS_ATTR_FATTR)) {
1083                error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr);
1084                if (error < 0) {
1085                        dprintk("nfs_create_server: getattr error = %d\n", -error);
1086                        goto error;
1087                }
1088        }
1089        memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1090
1091        dprintk("Server FSID: %llx:%llx\n",
1092                (unsigned long long) server->fsid.major,
1093                (unsigned long long) server->fsid.minor);
1094
1095        nfs_server_insert_lists(server);
1096        server->mount_time = jiffies;
1097        nfs_free_fattr(fattr);
1098        return server;
1099
1100error:
1101        nfs_free_fattr(fattr);
1102        nfs_free_server(server);
1103        return ERR_PTR(error);
1104}
1105EXPORT_SYMBOL_GPL(nfs_create_server);
1106
1107/*
1108 * Clone an NFS2, NFS3 or NFS4 server record
1109 */
1110struct nfs_server *nfs_clone_server(struct nfs_server *source,
1111                                    struct nfs_fh *fh,
1112                                    struct nfs_fattr *fattr,
1113                                    rpc_authflavor_t flavor)
1114{
1115        struct nfs_server *server;
1116        struct nfs_fattr *fattr_fsinfo;
1117        int error;
1118
1119        dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1120                (unsigned long long) fattr->fsid.major,
1121                (unsigned long long) fattr->fsid.minor);
1122
1123        server = nfs_alloc_server();
1124        if (!server)
1125                return ERR_PTR(-ENOMEM);
1126
1127        error = -ENOMEM;
1128        fattr_fsinfo = nfs_alloc_fattr();
1129        if (fattr_fsinfo == NULL)
1130                goto out_free_server;
1131
1132        /* Copy data from the source */
1133        server->nfs_client = source->nfs_client;
1134        server->destroy = source->destroy;
1135        atomic_inc(&server->nfs_client->cl_count);
1136        nfs_server_copy_userdata(server, source);
1137
1138        server->fsid = fattr->fsid;
1139
1140        error = nfs_init_server_rpcclient(server,
1141                        source->client->cl_timeout,
1142                        flavor);
1143        if (error < 0)
1144                goto out_free_server;
1145
1146        /* probe the filesystem info for this server filesystem */
1147        error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1148        if (error < 0)
1149                goto out_free_server;
1150
1151        if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1152                server->namelen = NFS4_MAXNAMLEN;
1153
1154        dprintk("Cloned FSID: %llx:%llx\n",
1155                (unsigned long long) server->fsid.major,
1156                (unsigned long long) server->fsid.minor);
1157
1158        error = nfs_start_lockd(server);
1159        if (error < 0)
1160                goto out_free_server;
1161
1162        nfs_server_insert_lists(server);
1163        server->mount_time = jiffies;
1164
1165        nfs_free_fattr(fattr_fsinfo);
1166        dprintk("<-- nfs_clone_server() = %p\n", server);
1167        return server;
1168
1169out_free_server:
1170        nfs_free_fattr(fattr_fsinfo);
1171        nfs_free_server(server);
1172        dprintk("<-- nfs_clone_server() = error %d\n", error);
1173        return ERR_PTR(error);
1174}
1175EXPORT_SYMBOL_GPL(nfs_clone_server);
1176
1177void nfs_clients_init(struct net *net)
1178{
1179        struct nfs_net *nn = net_generic(net, nfs_net_id);
1180
1181        INIT_LIST_HEAD(&nn->nfs_client_list);
1182        INIT_LIST_HEAD(&nn->nfs_volume_list);
1183#if IS_ENABLED(CONFIG_NFS_V4)
1184        idr_init(&nn->cb_ident_idr);
1185#endif
1186        spin_lock_init(&nn->nfs_client_lock);
1187        nn->boot_time = CURRENT_TIME;
1188}
1189
1190#ifdef CONFIG_PROC_FS
1191static struct proc_dir_entry *proc_fs_nfs;
1192
1193static int nfs_server_list_open(struct inode *inode, struct file *file);
1194static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1195static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1196static void nfs_server_list_stop(struct seq_file *p, void *v);
1197static int nfs_server_list_show(struct seq_file *m, void *v);
1198
1199static const struct seq_operations nfs_server_list_ops = {
1200        .start  = nfs_server_list_start,
1201        .next   = nfs_server_list_next,
1202        .stop   = nfs_server_list_stop,
1203        .show   = nfs_server_list_show,
1204};
1205
1206static const struct file_operations nfs_server_list_fops = {
1207        .open           = nfs_server_list_open,
1208        .read           = seq_read,
1209        .llseek         = seq_lseek,
1210        .release        = seq_release,
1211        .owner          = THIS_MODULE,
1212};
1213
1214static int nfs_volume_list_open(struct inode *inode, struct file *file);
1215static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1216static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1217static void nfs_volume_list_stop(struct seq_file *p, void *v);
1218static int nfs_volume_list_show(struct seq_file *m, void *v);
1219
1220static const struct seq_operations nfs_volume_list_ops = {
1221        .start  = nfs_volume_list_start,
1222        .next   = nfs_volume_list_next,
1223        .stop   = nfs_volume_list_stop,
1224        .show   = nfs_volume_list_show,
1225};
1226
1227static const struct file_operations nfs_volume_list_fops = {
1228        .open           = nfs_volume_list_open,
1229        .read           = seq_read,
1230        .llseek         = seq_lseek,
1231        .release        = seq_release,
1232        .owner          = THIS_MODULE,
1233};
1234
1235/*
1236 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1237 * we're dealing
1238 */
1239static int nfs_server_list_open(struct inode *inode, struct file *file)
1240{
1241        struct seq_file *m;
1242        int ret;
1243        struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1244        struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1245
1246        ret = seq_open(file, &nfs_server_list_ops);
1247        if (ret < 0)
1248                return ret;
1249
1250        m = file->private_data;
1251        m->private = net;
1252
1253        return 0;
1254}
1255
1256/*
1257 * set up the iterator to start reading from the server list and return the first item
1258 */
1259static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1260{
1261        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1262
1263        /* lock the list against modification */
1264        spin_lock(&nn->nfs_client_lock);
1265        return seq_list_start_head(&nn->nfs_client_list, *_pos);
1266}
1267
1268/*
1269 * move to next server
1270 */
1271static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1272{
1273        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1274
1275        return seq_list_next(v, &nn->nfs_client_list, pos);
1276}
1277
1278/*
1279 * clean up after reading from the transports list
1280 */
1281static void nfs_server_list_stop(struct seq_file *p, void *v)
1282{
1283        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1284
1285        spin_unlock(&nn->nfs_client_lock);
1286}
1287
1288/*
1289 * display a header line followed by a load of call lines
1290 */
1291static int nfs_server_list_show(struct seq_file *m, void *v)
1292{
1293        struct nfs_client *clp;
1294        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1295
1296        /* display header on line 1 */
1297        if (v == &nn->nfs_client_list) {
1298                seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1299                return 0;
1300        }
1301
1302        /* display one transport per line on subsequent lines */
1303        clp = list_entry(v, struct nfs_client, cl_share_link);
1304
1305        /* Check if the client is initialized */
1306        if (clp->cl_cons_state != NFS_CS_READY)
1307                return 0;
1308
1309        rcu_read_lock();
1310        seq_printf(m, "v%u %s %s %3d %s\n",
1311                   clp->rpc_ops->version,
1312                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1313                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1314                   atomic_read(&clp->cl_count),
1315                   clp->cl_hostname);
1316        rcu_read_unlock();
1317
1318        return 0;
1319}
1320
1321/*
1322 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1323 */
1324static int nfs_volume_list_open(struct inode *inode, struct file *file)
1325{
1326        struct seq_file *m;
1327        int ret;
1328        struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1329        struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1330
1331        ret = seq_open(file, &nfs_volume_list_ops);
1332        if (ret < 0)
1333                return ret;
1334
1335        m = file->private_data;
1336        m->private = net;
1337
1338        return 0;
1339}
1340
1341/*
1342 * set up the iterator to start reading from the volume list and return the first item
1343 */
1344static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1345{
1346        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1347
1348        /* lock the list against modification */
1349        spin_lock(&nn->nfs_client_lock);
1350        return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1351}
1352
1353/*
1354 * move to next volume
1355 */
1356static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1357{
1358        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1359
1360        return seq_list_next(v, &nn->nfs_volume_list, pos);
1361}
1362
1363/*
1364 * clean up after reading from the transports list
1365 */
1366static void nfs_volume_list_stop(struct seq_file *p, void *v)
1367{
1368        struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1369
1370        spin_unlock(&nn->nfs_client_lock);
1371}
1372
1373/*
1374 * display a header line followed by a load of call lines
1375 */
1376static int nfs_volume_list_show(struct seq_file *m, void *v)
1377{
1378        struct nfs_server *server;
1379        struct nfs_client *clp;
1380        char dev[8], fsid[17];
1381        struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1382
1383        /* display header on line 1 */
1384        if (v == &nn->nfs_volume_list) {
1385                seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1386                return 0;
1387        }
1388        /* display one transport per line on subsequent lines */
1389        server = list_entry(v, struct nfs_server, master_link);
1390        clp = server->nfs_client;
1391
1392        snprintf(dev, 8, "%u:%u",
1393                 MAJOR(server->s_dev), MINOR(server->s_dev));
1394
1395        snprintf(fsid, 17, "%llx:%llx",
1396                 (unsigned long long) server->fsid.major,
1397                 (unsigned long long) server->fsid.minor);
1398
1399        rcu_read_lock();
1400        seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1401                   clp->rpc_ops->version,
1402                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1403                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1404                   dev,
1405                   fsid,
1406                   nfs_server_fscache_state(server));
1407        rcu_read_unlock();
1408
1409        return 0;
1410}
1411
1412/*
1413 * initialise the /proc/fs/nfsfs/ directory
1414 */
1415int __init nfs_fs_proc_init(void)
1416{
1417        struct proc_dir_entry *p;
1418
1419        proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1420        if (!proc_fs_nfs)
1421                goto error_0;
1422
1423        /* a file of servers with which we're dealing */
1424        p = proc_create("servers", S_IFREG|S_IRUGO,
1425                        proc_fs_nfs, &nfs_server_list_fops);
1426        if (!p)
1427                goto error_1;
1428
1429        /* a file of volumes that we have mounted */
1430        p = proc_create("volumes", S_IFREG|S_IRUGO,
1431                        proc_fs_nfs, &nfs_volume_list_fops);
1432        if (!p)
1433                goto error_2;
1434        return 0;
1435
1436error_2:
1437        remove_proc_entry("servers", proc_fs_nfs);
1438error_1:
1439        remove_proc_entry("fs/nfsfs", NULL);
1440error_0:
1441        return -ENOMEM;
1442}
1443
1444/*
1445 * clean up the /proc/fs/nfsfs/ directory
1446 */
1447void nfs_fs_proc_exit(void)
1448{
1449        remove_proc_entry("volumes", proc_fs_nfs);
1450        remove_proc_entry("servers", proc_fs_nfs);
1451        remove_proc_entry("fs/nfsfs", NULL);
1452}
1453
1454#endif /* CONFIG_PROC_FS */
1455
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