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/addr.h>
  24#include <linux/sunrpc/clnt.h>
  25#include <linux/sunrpc/stats.h>
  26#include <linux/sunrpc/metrics.h>
  27#include <linux/sunrpc/xprtsock.h>
  28#include <linux/sunrpc/xprtrdma.h>
  29#include <linux/nfs_fs.h>
  30#include <linux/nfs_mount.h>
  31#include <linux/nfs4_mount.h>
  32#include <linux/lockd/bind.h>
  33#include <linux/seq_file.h>
  34#include <linux/mount.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#include "sysfs.h"
  57#include "nfs42.h"
  58
  59#define NFSDBG_FACILITY         NFSDBG_CLIENT
  60
  61static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
  62static DEFINE_SPINLOCK(nfs_version_lock);
  63static DEFINE_MUTEX(nfs_version_mutex);
  64static LIST_HEAD(nfs_versions);
  65
  66/*
  67 * RPC cruft for NFS
  68 */
  69static const struct rpc_version *nfs_version[5] = {
  70        [2] = NULL,
  71        [3] = NULL,
  72        [4] = NULL,
  73};
  74
  75const struct rpc_program nfs_program = {
  76        .name                   = "nfs",
  77        .number                 = NFS_PROGRAM,
  78        .nrvers                 = ARRAY_SIZE(nfs_version),
  79        .version                = nfs_version,
  80        .stats                  = &nfs_rpcstat,
  81        .pipe_dir_name          = NFS_PIPE_DIRNAME,
  82};
  83
  84struct rpc_stat nfs_rpcstat = {
  85        .program                = &nfs_program
  86};
  87
  88static struct nfs_subversion *find_nfs_version(unsigned int version)
  89{
  90        struct nfs_subversion *nfs;
  91        spin_lock(&nfs_version_lock);
  92
  93        list_for_each_entry(nfs, &nfs_versions, list) {
  94                if (nfs->rpc_ops->version == version) {
  95                        spin_unlock(&nfs_version_lock);
  96                        return nfs;
  97                }
  98        }
  99
 100        spin_unlock(&nfs_version_lock);
 101        return ERR_PTR(-EPROTONOSUPPORT);
 102}
 103
 104struct nfs_subversion *get_nfs_version(unsigned int version)
 105{
 106        struct nfs_subversion *nfs = find_nfs_version(version);
 107
 108        if (IS_ERR(nfs)) {
 109                mutex_lock(&nfs_version_mutex);
 110                request_module("nfsv%d", version);
 111                nfs = find_nfs_version(version);
 112                mutex_unlock(&nfs_version_mutex);
 113        }
 114
 115        if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
 116                return ERR_PTR(-EAGAIN);
 117        return nfs;
 118}
 119
 120void put_nfs_version(struct nfs_subversion *nfs)
 121{
 122        module_put(nfs->owner);
 123}
 124
 125void register_nfs_version(struct nfs_subversion *nfs)
 126{
 127        spin_lock(&nfs_version_lock);
 128
 129        list_add(&nfs->list, &nfs_versions);
 130        nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
 131
 132        spin_unlock(&nfs_version_lock);
 133}
 134EXPORT_SYMBOL_GPL(register_nfs_version);
 135
 136void unregister_nfs_version(struct nfs_subversion *nfs)
 137{
 138        spin_lock(&nfs_version_lock);
 139
 140        nfs_version[nfs->rpc_ops->version] = NULL;
 141        list_del(&nfs->list);
 142
 143        spin_unlock(&nfs_version_lock);
 144}
 145EXPORT_SYMBOL_GPL(unregister_nfs_version);
 146
 147/*
 148 * Allocate a shared client record
 149 *
 150 * Since these are allocated/deallocated very rarely, we don't
 151 * bother putting them in a slab cache...
 152 */
 153struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
 154{
 155        struct nfs_client *clp;
 156        int err = -ENOMEM;
 157
 158        if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
 159                goto error_0;
 160
 161        clp->cl_minorversion = cl_init->minorversion;
 162        clp->cl_nfs_mod = cl_init->nfs_mod;
 163        if (!try_module_get(clp->cl_nfs_mod->owner))
 164                goto error_dealloc;
 165
 166        clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
 167
 168        refcount_set(&clp->cl_count, 1);
 169        clp->cl_cons_state = NFS_CS_INITING;
 170
 171        memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
 172        clp->cl_addrlen = cl_init->addrlen;
 173
 174        if (cl_init->hostname) {
 175                err = -ENOMEM;
 176                clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
 177                if (!clp->cl_hostname)
 178                        goto error_cleanup;
 179        }
 180
 181        INIT_LIST_HEAD(&clp->cl_superblocks);
 182        clp->cl_rpcclient = ERR_PTR(-EINVAL);
 183
 184        clp->cl_proto = cl_init->proto;
 185        clp->cl_nconnect = cl_init->nconnect;
 186        clp->cl_net = get_net(cl_init->net);
 187
 188        clp->cl_principal = "*";
 189        nfs_fscache_get_client_cookie(clp);
 190
 191        return clp;
 192
 193error_cleanup:
 194        put_nfs_version(clp->cl_nfs_mod);
 195error_dealloc:
 196        kfree(clp);
 197error_0:
 198        return ERR_PTR(err);
 199}
 200EXPORT_SYMBOL_GPL(nfs_alloc_client);
 201
 202#if IS_ENABLED(CONFIG_NFS_V4)
 203static void nfs_cleanup_cb_ident_idr(struct net *net)
 204{
 205        struct nfs_net *nn = net_generic(net, nfs_net_id);
 206
 207        idr_destroy(&nn->cb_ident_idr);
 208}
 209
 210/* nfs_client_lock held */
 211static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
 212{
 213        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
 214
 215        if (clp->cl_cb_ident)
 216                idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
 217}
 218
 219static void pnfs_init_server(struct nfs_server *server)
 220{
 221        rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
 222}
 223
 224#else
 225static void nfs_cleanup_cb_ident_idr(struct net *net)
 226{
 227}
 228
 229static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
 230{
 231}
 232
 233static void pnfs_init_server(struct nfs_server *server)
 234{
 235}
 236
 237#endif /* CONFIG_NFS_V4 */
 238
 239/*
 240 * Destroy a shared client record
 241 */
 242void nfs_free_client(struct nfs_client *clp)
 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        put_net(clp->cl_net);
 251        put_nfs_version(clp->cl_nfs_mod);
 252        kfree(clp->cl_hostname);
 253        kfree(clp->cl_acceptor);
 254        kfree(clp);
 255}
 256EXPORT_SYMBOL_GPL(nfs_free_client);
 257
 258/*
 259 * Release a reference to a shared client record
 260 */
 261void nfs_put_client(struct nfs_client *clp)
 262{
 263        struct nfs_net *nn;
 264
 265        if (!clp)
 266                return;
 267
 268        nn = net_generic(clp->cl_net, nfs_net_id);
 269
 270        if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
 271                list_del(&clp->cl_share_link);
 272                nfs_cb_idr_remove_locked(clp);
 273                spin_unlock(&nn->nfs_client_lock);
 274
 275                WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
 276
 277                clp->rpc_ops->free_client(clp);
 278        }
 279}
 280EXPORT_SYMBOL_GPL(nfs_put_client);
 281
 282/*
 283 * Find an nfs_client on the list that matches the initialisation data
 284 * that is supplied.
 285 */
 286static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
 287{
 288        struct nfs_client *clp;
 289        const struct sockaddr *sap = data->addr;
 290        struct nfs_net *nn = net_generic(data->net, nfs_net_id);
 291        int error;
 292
 293again:
 294        list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 295                const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 296                /* Don't match clients that failed to initialise properly */
 297                if (clp->cl_cons_state < 0)
 298                        continue;
 299
 300                /* If a client is still initializing then we need to wait */
 301                if (clp->cl_cons_state > NFS_CS_READY) {
 302                        refcount_inc(&clp->cl_count);
 303                        spin_unlock(&nn->nfs_client_lock);
 304                        error = nfs_wait_client_init_complete(clp);
 305                        nfs_put_client(clp);
 306                        spin_lock(&nn->nfs_client_lock);
 307                        if (error < 0)
 308                                return ERR_PTR(error);
 309                        goto again;
 310                }
 311
 312                /* Different NFS versions cannot share the same nfs_client */
 313                if (clp->rpc_ops != data->nfs_mod->rpc_ops)
 314                        continue;
 315
 316                if (clp->cl_proto != data->proto)
 317                        continue;
 318                /* Match nfsv4 minorversion */
 319                if (clp->cl_minorversion != data->minorversion)
 320                        continue;
 321
 322                /* Match request for a dedicated DS */
 323                if (test_bit(NFS_CS_DS, &data->init_flags) !=
 324                    test_bit(NFS_CS_DS, &clp->cl_flags))
 325                        continue;
 326
 327                /* Match the full socket address */
 328                if (!rpc_cmp_addr_port(sap, clap))
 329                        /* Match all xprt_switch full socket addresses */
 330                        if (IS_ERR(clp->cl_rpcclient) ||
 331                            !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
 332                                                           sap))
 333                                continue;
 334
 335                refcount_inc(&clp->cl_count);
 336                return clp;
 337        }
 338        return NULL;
 339}
 340
 341/*
 342 * Return true if @clp is done initializing, false if still working on it.
 343 *
 344 * Use nfs_client_init_status to check if it was successful.
 345 */
 346bool nfs_client_init_is_complete(const struct nfs_client *clp)
 347{
 348        return clp->cl_cons_state <= NFS_CS_READY;
 349}
 350EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
 351
 352/*
 353 * Return 0 if @clp was successfully initialized, -errno otherwise.
 354 *
 355 * This must be called *after* nfs_client_init_is_complete() returns true,
 356 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
 357 */
 358int nfs_client_init_status(const struct nfs_client *clp)
 359{
 360        /* called without checking nfs_client_init_is_complete */
 361        if (clp->cl_cons_state > NFS_CS_READY) {
 362                WARN_ON_ONCE(1);
 363                return -EINVAL;
 364        }
 365        return clp->cl_cons_state;
 366}
 367EXPORT_SYMBOL_GPL(nfs_client_init_status);
 368
 369int nfs_wait_client_init_complete(const struct nfs_client *clp)
 370{
 371        return wait_event_killable(nfs_client_active_wq,
 372                        nfs_client_init_is_complete(clp));
 373}
 374EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
 375
 376/*
 377 * Found an existing client.  Make sure it's ready before returning.
 378 */
 379static struct nfs_client *
 380nfs_found_client(const struct nfs_client_initdata *cl_init,
 381                 struct nfs_client *clp)
 382{
 383        int error;
 384
 385        error = nfs_wait_client_init_complete(clp);
 386        if (error < 0) {
 387                nfs_put_client(clp);
 388                return ERR_PTR(-ERESTARTSYS);
 389        }
 390
 391        if (clp->cl_cons_state < NFS_CS_READY) {
 392                error = clp->cl_cons_state;
 393                nfs_put_client(clp);
 394                return ERR_PTR(error);
 395        }
 396
 397        smp_rmb();
 398        return clp;
 399}
 400
 401/*
 402 * Look up a client by IP address and protocol version
 403 * - creates a new record if one doesn't yet exist
 404 */
 405struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
 406{
 407        struct nfs_client *clp, *new = NULL;
 408        struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
 409        const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
 410
 411        if (cl_init->hostname == NULL) {
 412                WARN_ON(1);
 413                return ERR_PTR(-EINVAL);
 414        }
 415
 416        /* see if the client already exists */
 417        do {
 418                spin_lock(&nn->nfs_client_lock);
 419
 420                clp = nfs_match_client(cl_init);
 421                if (clp) {
 422                        spin_unlock(&nn->nfs_client_lock);
 423                        if (new)
 424                                new->rpc_ops->free_client(new);
 425                        if (IS_ERR(clp))
 426                                return clp;
 427                        return nfs_found_client(cl_init, clp);
 428                }
 429                if (new) {
 430                        list_add_tail(&new->cl_share_link,
 431                                        &nn->nfs_client_list);
 432                        spin_unlock(&nn->nfs_client_lock);
 433                        new->cl_flags = cl_init->init_flags;
 434                        return rpc_ops->init_client(new, cl_init);
 435                }
 436
 437                spin_unlock(&nn->nfs_client_lock);
 438
 439                new = rpc_ops->alloc_client(cl_init);
 440        } while (!IS_ERR(new));
 441
 442        return new;
 443}
 444EXPORT_SYMBOL_GPL(nfs_get_client);
 445
 446/*
 447 * Mark a server as ready or failed
 448 */
 449void nfs_mark_client_ready(struct nfs_client *clp, int state)
 450{
 451        smp_wmb();
 452        clp->cl_cons_state = state;
 453        wake_up_all(&nfs_client_active_wq);
 454}
 455EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
 456
 457/*
 458 * Initialise the timeout values for a connection
 459 */
 460void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
 461                                    int timeo, int retrans)
 462{
 463        to->to_initval = timeo * HZ / 10;
 464        to->to_retries = retrans;
 465
 466        switch (proto) {
 467        case XPRT_TRANSPORT_TCP:
 468        case XPRT_TRANSPORT_RDMA:
 469                if (retrans == NFS_UNSPEC_RETRANS)
 470                        to->to_retries = NFS_DEF_TCP_RETRANS;
 471                if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
 472                        to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
 473                if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
 474                        to->to_initval = NFS_MAX_TCP_TIMEOUT;
 475                to->to_increment = to->to_initval;
 476                to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
 477                if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
 478                        to->to_maxval = NFS_MAX_TCP_TIMEOUT;
 479                if (to->to_maxval < to->to_initval)
 480                        to->to_maxval = to->to_initval;
 481                to->to_exponential = 0;
 482                break;
 483        case XPRT_TRANSPORT_UDP:
 484                if (retrans == NFS_UNSPEC_RETRANS)
 485                        to->to_retries = NFS_DEF_UDP_RETRANS;
 486                if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
 487                        to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
 488                if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
 489                        to->to_initval = NFS_MAX_UDP_TIMEOUT;
 490                to->to_maxval = NFS_MAX_UDP_TIMEOUT;
 491                to->to_exponential = 1;
 492                break;
 493        default:
 494                BUG();
 495        }
 496}
 497EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
 498
 499/*
 500 * Create an RPC client handle
 501 */
 502int nfs_create_rpc_client(struct nfs_client *clp,
 503                          const struct nfs_client_initdata *cl_init,
 504                          rpc_authflavor_t flavor)
 505{
 506        struct rpc_clnt         *clnt = NULL;
 507        struct rpc_create_args args = {
 508                .net            = clp->cl_net,
 509                .protocol       = clp->cl_proto,
 510                .nconnect       = clp->cl_nconnect,
 511                .address        = (struct sockaddr *)&clp->cl_addr,
 512                .addrsize       = clp->cl_addrlen,
 513                .timeout        = cl_init->timeparms,
 514                .servername     = clp->cl_hostname,
 515                .nodename       = cl_init->nodename,
 516                .program        = &nfs_program,
 517                .version        = clp->rpc_ops->version,
 518                .authflavor     = flavor,
 519                .cred           = cl_init->cred,
 520        };
 521
 522        if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
 523                args.flags |= RPC_CLNT_CREATE_DISCRTRY;
 524        if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
 525                args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
 526        if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
 527                args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
 528        if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
 529                args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
 530        if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
 531                args.flags |= RPC_CLNT_CREATE_NOPING;
 532        if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
 533                args.flags |= RPC_CLNT_CREATE_REUSEPORT;
 534
 535        if (!IS_ERR(clp->cl_rpcclient))
 536                return 0;
 537
 538        clnt = rpc_create(&args);
 539        if (IS_ERR(clnt)) {
 540                dprintk("%s: cannot create RPC client. Error = %ld\n",
 541                                __func__, PTR_ERR(clnt));
 542                return PTR_ERR(clnt);
 543        }
 544
 545        clnt->cl_principal = clp->cl_principal;
 546        clp->cl_rpcclient = clnt;
 547        return 0;
 548}
 549EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
 550
 551/*
 552 * Version 2 or 3 client destruction
 553 */
 554static void nfs_destroy_server(struct nfs_server *server)
 555{
 556        if (server->nlm_host)
 557                nlmclnt_done(server->nlm_host);
 558}
 559
 560/*
 561 * Version 2 or 3 lockd setup
 562 */
 563static int nfs_start_lockd(struct nfs_server *server)
 564{
 565        struct nlm_host *host;
 566        struct nfs_client *clp = server->nfs_client;
 567        struct nlmclnt_initdata nlm_init = {
 568                .hostname       = clp->cl_hostname,
 569                .address        = (struct sockaddr *)&clp->cl_addr,
 570                .addrlen        = clp->cl_addrlen,
 571                .nfs_version    = clp->rpc_ops->version,
 572                .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
 573                                        1 : 0,
 574                .net            = clp->cl_net,
 575                .nlmclnt_ops    = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
 576                .cred           = server->cred,
 577        };
 578
 579        if (nlm_init.nfs_version > 3)
 580                return 0;
 581        if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
 582                        (server->flags & NFS_MOUNT_LOCAL_FCNTL))
 583                return 0;
 584
 585        switch (clp->cl_proto) {
 586                default:
 587                        nlm_init.protocol = IPPROTO_TCP;
 588                        break;
 589                case XPRT_TRANSPORT_UDP:
 590                        nlm_init.protocol = IPPROTO_UDP;
 591        }
 592
 593        host = nlmclnt_init(&nlm_init);
 594        if (IS_ERR(host))
 595                return PTR_ERR(host);
 596
 597        server->nlm_host = host;
 598        server->destroy = nfs_destroy_server;
 599        return 0;
 600}
 601
 602/*
 603 * Create a general RPC client
 604 */
 605int nfs_init_server_rpcclient(struct nfs_server *server,
 606                const struct rpc_timeout *timeo,
 607                rpc_authflavor_t pseudoflavour)
 608{
 609        struct nfs_client *clp = server->nfs_client;
 610
 611        server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
 612                                                        pseudoflavour);
 613        if (IS_ERR(server->client)) {
 614                dprintk("%s: couldn't create rpc_client!\n", __func__);
 615                return PTR_ERR(server->client);
 616        }
 617
 618        memcpy(&server->client->cl_timeout_default,
 619                        timeo,
 620                        sizeof(server->client->cl_timeout_default));
 621        server->client->cl_timeout = &server->client->cl_timeout_default;
 622        server->client->cl_softrtry = 0;
 623        if (server->flags & NFS_MOUNT_SOFTERR)
 624                server->client->cl_softerr = 1;
 625        if (server->flags & NFS_MOUNT_SOFT)
 626                server->client->cl_softrtry = 1;
 627
 628        return 0;
 629}
 630EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
 631
 632/**
 633 * nfs_init_client - Initialise an NFS2 or NFS3 client
 634 *
 635 * @clp: nfs_client to initialise
 636 * @cl_init: Initialisation parameters
 637 *
 638 * Returns pointer to an NFS client, or an ERR_PTR value.
 639 */
 640struct nfs_client *nfs_init_client(struct nfs_client *clp,
 641                                   const struct nfs_client_initdata *cl_init)
 642{
 643        int error;
 644
 645        /* the client is already initialised */
 646        if (clp->cl_cons_state == NFS_CS_READY)
 647                return clp;
 648
 649        /*
 650         * Create a client RPC handle for doing FSSTAT with UNIX auth only
 651         * - RFC 2623, sec 2.3.2
 652         */
 653        error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
 654        nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
 655        if (error < 0) {
 656                nfs_put_client(clp);
 657                clp = ERR_PTR(error);
 658        }
 659        return clp;
 660}
 661EXPORT_SYMBOL_GPL(nfs_init_client);
 662
 663/*
 664 * Create a version 2 or 3 client
 665 */
 666static int nfs_init_server(struct nfs_server *server,
 667                           const struct fs_context *fc)
 668{
 669        const struct nfs_fs_context *ctx = nfs_fc2context(fc);
 670        struct rpc_timeout timeparms;
 671        struct nfs_client_initdata cl_init = {
 672                .hostname = ctx->nfs_server.hostname,
 673                .addr = (const struct sockaddr *)&ctx->nfs_server.address,
 674                .addrlen = ctx->nfs_server.addrlen,
 675                .nfs_mod = ctx->nfs_mod,
 676                .proto = ctx->nfs_server.protocol,
 677                .net = fc->net_ns,
 678                .timeparms = &timeparms,
 679                .cred = server->cred,
 680                .nconnect = ctx->nfs_server.nconnect,
 681                .init_flags = (1UL << NFS_CS_REUSEPORT),
 682        };
 683        struct nfs_client *clp;
 684        int error;
 685
 686        nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
 687                                ctx->timeo, ctx->retrans);
 688        if (ctx->flags & NFS_MOUNT_NORESVPORT)
 689                set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 690
 691        /* Allocate or find a client reference we can use */
 692        clp = nfs_get_client(&cl_init);
 693        if (IS_ERR(clp))
 694                return PTR_ERR(clp);
 695
 696        server->nfs_client = clp;
 697
 698        /* Initialise the client representation from the mount data */
 699        server->flags = ctx->flags;
 700        server->options = ctx->options;
 701        server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
 702                NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
 703                NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
 704
 705        if (ctx->rsize)
 706                server->rsize = nfs_block_size(ctx->rsize, NULL);
 707        if (ctx->wsize)
 708                server->wsize = nfs_block_size(ctx->wsize, NULL);
 709
 710        server->acregmin = ctx->acregmin * HZ;
 711        server->acregmax = ctx->acregmax * HZ;
 712        server->acdirmin = ctx->acdirmin * HZ;
 713        server->acdirmax = ctx->acdirmax * HZ;
 714
 715        /* Start lockd here, before we might error out */
 716        error = nfs_start_lockd(server);
 717        if (error < 0)
 718                goto error;
 719
 720        server->port = ctx->nfs_server.port;
 721        server->auth_info = ctx->auth_info;
 722
 723        error = nfs_init_server_rpcclient(server, &timeparms,
 724                                          ctx->selected_flavor);
 725        if (error < 0)
 726                goto error;
 727
 728        /* Preserve the values of mount_server-related mount options */
 729        if (ctx->mount_server.addrlen) {
 730                memcpy(&server->mountd_address, &ctx->mount_server.address,
 731                        ctx->mount_server.addrlen);
 732                server->mountd_addrlen = ctx->mount_server.addrlen;
 733        }
 734        server->mountd_version = ctx->mount_server.version;
 735        server->mountd_port = ctx->mount_server.port;
 736        server->mountd_protocol = ctx->mount_server.protocol;
 737
 738        server->namelen  = ctx->namlen;
 739        return 0;
 740
 741error:
 742        server->nfs_client = NULL;
 743        nfs_put_client(clp);
 744        return error;
 745}
 746
 747/*
 748 * Load up the server record from information gained in an fsinfo record
 749 */
 750static void nfs_server_set_fsinfo(struct nfs_server *server,
 751                                  struct nfs_fsinfo *fsinfo)
 752{
 753        unsigned long max_rpc_payload, raw_max_rpc_payload;
 754
 755        /* Work out a lot of parameters */
 756        if (server->rsize == 0)
 757                server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
 758        if (server->wsize == 0)
 759                server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
 760
 761        if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
 762                server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
 763        if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
 764                server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
 765
 766        raw_max_rpc_payload = rpc_max_payload(server->client);
 767        max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
 768
 769        if (server->rsize > max_rpc_payload)
 770                server->rsize = max_rpc_payload;
 771        if (server->rsize > NFS_MAX_FILE_IO_SIZE)
 772                server->rsize = NFS_MAX_FILE_IO_SIZE;
 773        server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
 774
 775        if (server->wsize > max_rpc_payload)
 776                server->wsize = max_rpc_payload;
 777        if (server->wsize > NFS_MAX_FILE_IO_SIZE)
 778                server->wsize = NFS_MAX_FILE_IO_SIZE;
 779        server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
 780
 781        server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
 782
 783        server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
 784        if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
 785                server->dtsize = NFS_MAX_FILE_IO_SIZE;
 786        if (server->dtsize > server->rsize)
 787                server->dtsize = server->rsize;
 788
 789        if (server->flags & NFS_MOUNT_NOAC) {
 790                server->acregmin = server->acregmax = 0;
 791                server->acdirmin = server->acdirmax = 0;
 792        }
 793
 794        server->maxfilesize = fsinfo->maxfilesize;
 795
 796        server->time_delta = fsinfo->time_delta;
 797
 798        server->clone_blksize = fsinfo->clone_blksize;
 799        /* We're airborne Set socket buffersize */
 800        rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
 801
 802#ifdef CONFIG_NFS_V4_2
 803        /*
 804         * Defaults until limited by the session parameters.
 805         */
 806        server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
 807                                XATTR_SIZE_MAX);
 808        server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
 809                                XATTR_SIZE_MAX);
 810        server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
 811                                nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
 812
 813        if (fsinfo->xattr_support)
 814                server->caps |= NFS_CAP_XATTR;
 815#endif
 816}
 817
 818/*
 819 * Probe filesystem information, including the FSID on v2/v3
 820 */
 821int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
 822{
 823        struct nfs_fsinfo fsinfo;
 824        struct nfs_client *clp = server->nfs_client;
 825        int error;
 826
 827        if (clp->rpc_ops->set_capabilities != NULL) {
 828                error = clp->rpc_ops->set_capabilities(server, mntfh);
 829                if (error < 0)
 830                        return error;
 831        }
 832
 833        fsinfo.fattr = fattr;
 834        fsinfo.nlayouttypes = 0;
 835        memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
 836        error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
 837        if (error < 0)
 838                return error;
 839
 840        nfs_server_set_fsinfo(server, &fsinfo);
 841
 842        /* Get some general file system info */
 843        if (server->namelen == 0) {
 844                struct nfs_pathconf pathinfo;
 845
 846                pathinfo.fattr = fattr;
 847                nfs_fattr_init(fattr);
 848
 849                if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
 850                        server->namelen = pathinfo.max_namelen;
 851        }
 852
 853        return 0;
 854}
 855EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
 856
 857/*
 858 * Copy useful information when duplicating a server record
 859 */
 860void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
 861{
 862        target->flags = source->flags;
 863        target->rsize = source->rsize;
 864        target->wsize = source->wsize;
 865        target->acregmin = source->acregmin;
 866        target->acregmax = source->acregmax;
 867        target->acdirmin = source->acdirmin;
 868        target->acdirmax = source->acdirmax;
 869        target->caps = source->caps;
 870        target->options = source->options;
 871        target->auth_info = source->auth_info;
 872        target->port = source->port;
 873}
 874EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
 875
 876void nfs_server_insert_lists(struct nfs_server *server)
 877{
 878        struct nfs_client *clp = server->nfs_client;
 879        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
 880
 881        spin_lock(&nn->nfs_client_lock);
 882        list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
 883        list_add_tail(&server->master_link, &nn->nfs_volume_list);
 884        clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
 885        spin_unlock(&nn->nfs_client_lock);
 886
 887}
 888EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
 889
 890void nfs_server_remove_lists(struct nfs_server *server)
 891{
 892        struct nfs_client *clp = server->nfs_client;
 893        struct nfs_net *nn;
 894
 895        if (clp == NULL)
 896                return;
 897        nn = net_generic(clp->cl_net, nfs_net_id);
 898        spin_lock(&nn->nfs_client_lock);
 899        list_del_rcu(&server->client_link);
 900        if (list_empty(&clp->cl_superblocks))
 901                set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
 902        list_del(&server->master_link);
 903        spin_unlock(&nn->nfs_client_lock);
 904
 905        synchronize_rcu();
 906}
 907EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
 908
 909/*
 910 * Allocate and initialise a server record
 911 */
 912struct nfs_server *nfs_alloc_server(void)
 913{
 914        struct nfs_server *server;
 915
 916        server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
 917        if (!server)
 918                return NULL;
 919
 920        server->client = server->client_acl = ERR_PTR(-EINVAL);
 921
 922        /* Zero out the NFS state stuff */
 923        INIT_LIST_HEAD(&server->client_link);
 924        INIT_LIST_HEAD(&server->master_link);
 925        INIT_LIST_HEAD(&server->delegations);
 926        INIT_LIST_HEAD(&server->layouts);
 927        INIT_LIST_HEAD(&server->state_owners_lru);
 928        INIT_LIST_HEAD(&server->ss_copies);
 929
 930        atomic_set(&server->active, 0);
 931
 932        server->io_stats = nfs_alloc_iostats();
 933        if (!server->io_stats) {
 934                kfree(server);
 935                return NULL;
 936        }
 937
 938        ida_init(&server->openowner_id);
 939        ida_init(&server->lockowner_id);
 940        pnfs_init_server(server);
 941        rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
 942
 943        return server;
 944}
 945EXPORT_SYMBOL_GPL(nfs_alloc_server);
 946
 947/*
 948 * Free up a server record
 949 */
 950void nfs_free_server(struct nfs_server *server)
 951{
 952        nfs_server_remove_lists(server);
 953
 954        if (server->destroy != NULL)
 955                server->destroy(server);
 956
 957        if (!IS_ERR(server->client_acl))
 958                rpc_shutdown_client(server->client_acl);
 959        if (!IS_ERR(server->client))
 960                rpc_shutdown_client(server->client);
 961
 962        nfs_put_client(server->nfs_client);
 963
 964        ida_destroy(&server->lockowner_id);
 965        ida_destroy(&server->openowner_id);
 966        nfs_free_iostats(server->io_stats);
 967        put_cred(server->cred);
 968        kfree(server);
 969        nfs_release_automount_timer();
 970}
 971EXPORT_SYMBOL_GPL(nfs_free_server);
 972
 973/*
 974 * Create a version 2 or 3 volume record
 975 * - keyed on server and FSID
 976 */
 977struct nfs_server *nfs_create_server(struct fs_context *fc)
 978{
 979        struct nfs_fs_context *ctx = nfs_fc2context(fc);
 980        struct nfs_server *server;
 981        struct nfs_fattr *fattr;
 982        int error;
 983
 984        server = nfs_alloc_server();
 985        if (!server)
 986                return ERR_PTR(-ENOMEM);
 987
 988        server->cred = get_cred(fc->cred);
 989
 990        error = -ENOMEM;
 991        fattr = nfs_alloc_fattr();
 992        if (fattr == NULL)
 993                goto error;
 994
 995        /* Get a client representation */
 996        error = nfs_init_server(server, fc);
 997        if (error < 0)
 998                goto error;
 999
1000        /* Probe the root fh to retrieve its FSID */
1001        error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1002        if (error < 0)
1003                goto error;
1004        if (server->nfs_client->rpc_ops->version == 3) {
1005                if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1006                        server->namelen = NFS3_MAXNAMLEN;
1007                if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1008                        server->caps |= NFS_CAP_READDIRPLUS;
1009        } else {
1010                if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1011                        server->namelen = NFS2_MAXNAMLEN;
1012        }
1013
1014        if (!(fattr->valid & NFS_ATTR_FATTR)) {
1015                error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1016                                                       fattr, NULL, NULL);
1017                if (error < 0) {
1018                        dprintk("nfs_create_server: getattr error = %d\n", -error);
1019                        goto error;
1020                }
1021        }
1022        memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1023
1024        dprintk("Server FSID: %llx:%llx\n",
1025                (unsigned long long) server->fsid.major,
1026                (unsigned long long) server->fsid.minor);
1027
1028        nfs_server_insert_lists(server);
1029        server->mount_time = jiffies;
1030        nfs_free_fattr(fattr);
1031        return server;
1032
1033error:
1034        nfs_free_fattr(fattr);
1035        nfs_free_server(server);
1036        return ERR_PTR(error);
1037}
1038EXPORT_SYMBOL_GPL(nfs_create_server);
1039
1040/*
1041 * Clone an NFS2, NFS3 or NFS4 server record
1042 */
1043struct nfs_server *nfs_clone_server(struct nfs_server *source,
1044                                    struct nfs_fh *fh,
1045                                    struct nfs_fattr *fattr,
1046                                    rpc_authflavor_t flavor)
1047{
1048        struct nfs_server *server;
1049        struct nfs_fattr *fattr_fsinfo;
1050        int error;
1051
1052        server = nfs_alloc_server();
1053        if (!server)
1054                return ERR_PTR(-ENOMEM);
1055
1056        server->cred = get_cred(source->cred);
1057
1058        error = -ENOMEM;
1059        fattr_fsinfo = nfs_alloc_fattr();
1060        if (fattr_fsinfo == NULL)
1061                goto out_free_server;
1062
1063        /* Copy data from the source */
1064        server->nfs_client = source->nfs_client;
1065        server->destroy = source->destroy;
1066        refcount_inc(&server->nfs_client->cl_count);
1067        nfs_server_copy_userdata(server, source);
1068
1069        server->fsid = fattr->fsid;
1070
1071        error = nfs_init_server_rpcclient(server,
1072                        source->client->cl_timeout,
1073                        flavor);
1074        if (error < 0)
1075                goto out_free_server;
1076
1077        /* probe the filesystem info for this server filesystem */
1078        error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1079        if (error < 0)
1080                goto out_free_server;
1081
1082        if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1083                server->namelen = NFS4_MAXNAMLEN;
1084
1085        error = nfs_start_lockd(server);
1086        if (error < 0)
1087                goto out_free_server;
1088
1089        nfs_server_insert_lists(server);
1090        server->mount_time = jiffies;
1091
1092        nfs_free_fattr(fattr_fsinfo);
1093        return server;
1094
1095out_free_server:
1096        nfs_free_fattr(fattr_fsinfo);
1097        nfs_free_server(server);
1098        return ERR_PTR(error);
1099}
1100EXPORT_SYMBOL_GPL(nfs_clone_server);
1101
1102void nfs_clients_init(struct net *net)
1103{
1104        struct nfs_net *nn = net_generic(net, nfs_net_id);
1105
1106        INIT_LIST_HEAD(&nn->nfs_client_list);
1107        INIT_LIST_HEAD(&nn->nfs_volume_list);
1108#if IS_ENABLED(CONFIG_NFS_V4)
1109        idr_init(&nn->cb_ident_idr);
1110#endif
1111        spin_lock_init(&nn->nfs_client_lock);
1112        nn->boot_time = ktime_get_real();
1113
1114        nfs_netns_sysfs_setup(nn, net);
1115}
1116
1117void nfs_clients_exit(struct net *net)
1118{
1119        struct nfs_net *nn = net_generic(net, nfs_net_id);
1120
1121        nfs_netns_sysfs_destroy(nn);
1122        nfs_cleanup_cb_ident_idr(net);
1123        WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1124        WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1125}
1126
1127#ifdef CONFIG_PROC_FS
1128static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1129static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1130static void nfs_server_list_stop(struct seq_file *p, void *v);
1131static int nfs_server_list_show(struct seq_file *m, void *v);
1132
1133static const struct seq_operations nfs_server_list_ops = {
1134        .start  = nfs_server_list_start,
1135        .next   = nfs_server_list_next,
1136        .stop   = nfs_server_list_stop,
1137        .show   = nfs_server_list_show,
1138};
1139
1140static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1141static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1142static void nfs_volume_list_stop(struct seq_file *p, void *v);
1143static int nfs_volume_list_show(struct seq_file *m, void *v);
1144
1145static const struct seq_operations nfs_volume_list_ops = {
1146        .start  = nfs_volume_list_start,
1147        .next   = nfs_volume_list_next,
1148        .stop   = nfs_volume_list_stop,
1149        .show   = nfs_volume_list_show,
1150};
1151
1152/*
1153 * set up the iterator to start reading from the server list and return the first item
1154 */
1155static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1156                                __acquires(&nn->nfs_client_lock)
1157{
1158        struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1159
1160        /* lock the list against modification */
1161        spin_lock(&nn->nfs_client_lock);
1162        return seq_list_start_head(&nn->nfs_client_list, *_pos);
1163}
1164
1165/*
1166 * move to next server
1167 */
1168static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1169{
1170        struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1171
1172        return seq_list_next(v, &nn->nfs_client_list, pos);
1173}
1174
1175/*
1176 * clean up after reading from the transports list
1177 */
1178static void nfs_server_list_stop(struct seq_file *p, void *v)
1179                                __releases(&nn->nfs_client_lock)
1180{
1181        struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1182
1183        spin_unlock(&nn->nfs_client_lock);
1184}
1185
1186/*
1187 * display a header line followed by a load of call lines
1188 */
1189static int nfs_server_list_show(struct seq_file *m, void *v)
1190{
1191        struct nfs_client *clp;
1192        struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1193
1194        /* display header on line 1 */
1195        if (v == &nn->nfs_client_list) {
1196                seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1197                return 0;
1198        }
1199
1200        /* display one transport per line on subsequent lines */
1201        clp = list_entry(v, struct nfs_client, cl_share_link);
1202
1203        /* Check if the client is initialized */
1204        if (clp->cl_cons_state != NFS_CS_READY)
1205                return 0;
1206
1207        rcu_read_lock();
1208        seq_printf(m, "v%u %s %s %3d %s\n",
1209                   clp->rpc_ops->version,
1210                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1211                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1212                   refcount_read(&clp->cl_count),
1213                   clp->cl_hostname);
1214        rcu_read_unlock();
1215
1216        return 0;
1217}
1218
1219/*
1220 * set up the iterator to start reading from the volume list and return the first item
1221 */
1222static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1223                                __acquires(&nn->nfs_client_lock)
1224{
1225        struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1226
1227        /* lock the list against modification */
1228        spin_lock(&nn->nfs_client_lock);
1229        return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1230}
1231
1232/*
1233 * move to next volume
1234 */
1235static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1236{
1237        struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1238
1239        return seq_list_next(v, &nn->nfs_volume_list, pos);
1240}
1241
1242/*
1243 * clean up after reading from the transports list
1244 */
1245static void nfs_volume_list_stop(struct seq_file *p, void *v)
1246                                __releases(&nn->nfs_client_lock)
1247{
1248        struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1249
1250        spin_unlock(&nn->nfs_client_lock);
1251}
1252
1253/*
1254 * display a header line followed by a load of call lines
1255 */
1256static int nfs_volume_list_show(struct seq_file *m, void *v)
1257{
1258        struct nfs_server *server;
1259        struct nfs_client *clp;
1260        char dev[13];   // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1261        char fsid[34];  // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1262        struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1263
1264        /* display header on line 1 */
1265        if (v == &nn->nfs_volume_list) {
1266                seq_puts(m, "NV SERVER   PORT DEV          FSID"
1267                            "                              FSC\n");
1268                return 0;
1269        }
1270        /* display one transport per line on subsequent lines */
1271        server = list_entry(v, struct nfs_server, master_link);
1272        clp = server->nfs_client;
1273
1274        snprintf(dev, sizeof(dev), "%u:%u",
1275                 MAJOR(server->s_dev), MINOR(server->s_dev));
1276
1277        snprintf(fsid, sizeof(fsid), "%llx:%llx",
1278                 (unsigned long long) server->fsid.major,
1279                 (unsigned long long) server->fsid.minor);
1280
1281        rcu_read_lock();
1282        seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1283                   clp->rpc_ops->version,
1284                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1285                   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1286                   dev,
1287                   fsid,
1288                   nfs_server_fscache_state(server));
1289        rcu_read_unlock();
1290
1291        return 0;
1292}
1293
1294int nfs_fs_proc_net_init(struct net *net)
1295{
1296        struct nfs_net *nn = net_generic(net, nfs_net_id);
1297        struct proc_dir_entry *p;
1298
1299        nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1300        if (!nn->proc_nfsfs)
1301                goto error_0;
1302
1303        /* a file of servers with which we're dealing */
1304        p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1305                        &nfs_server_list_ops, sizeof(struct seq_net_private));
1306        if (!p)
1307                goto error_1;
1308
1309        /* a file of volumes that we have mounted */
1310        p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1311                        &nfs_volume_list_ops, sizeof(struct seq_net_private));
1312        if (!p)
1313                goto error_1;
1314        return 0;
1315
1316error_1:
1317        remove_proc_subtree("nfsfs", net->proc_net);
1318error_0:
1319        return -ENOMEM;
1320}
1321
1322void nfs_fs_proc_net_exit(struct net *net)
1323{
1324        remove_proc_subtree("nfsfs", net->proc_net);
1325}
1326
1327/*
1328 * initialise the /proc/fs/nfsfs/ directory
1329 */
1330int __init nfs_fs_proc_init(void)
1331{
1332        if (!proc_mkdir("fs/nfsfs", NULL))
1333                goto error_0;
1334
1335        /* a file of servers with which we're dealing */
1336        if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1337                goto error_1;
1338
1339        /* a file of volumes that we have mounted */
1340        if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1341                goto error_1;
1342
1343        return 0;
1344error_1:
1345        remove_proc_subtree("fs/nfsfs", NULL);
1346error_0:
1347        return -ENOMEM;
1348}
1349
1350/*
1351 * clean up the /proc/fs/nfsfs/ directory
1352 */
1353void nfs_fs_proc_exit(void)
1354{
1355        remove_proc_subtree("fs/nfsfs", NULL);
1356}
1357
1358#endif /* CONFIG_PROC_FS */
1359