fs/nfs/client.c

   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 <net/ipv6.h>
  39 #include <linux/nfs_xdr.h>
  40
  41 #include <asm/system.h>
  42
  43 #include "nfs4_fs.h"
  44 #include "callback.h"
  45 #include "delegation.h"
  46 #include "iostat.h"
  47 #include "internal.h"
  48
  49 #define NFSDBG_FACILITY         NFSDBG_CLIENT
  50
  51 static DEFINE_SPINLOCK(nfs_client_lock);
  52 static LIST_HEAD(nfs_client_list);
  53 static LIST_HEAD(nfs_volume_list);
  54 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
  55
  56 /*
  57  * RPC cruft for NFS
  58  */
  59 static struct rpc_version *nfs_version[5] = {
  60         [2]                     = &nfs_version2,
  61 #ifdef CONFIG_NFS_V3
  62         [3]                     = &nfs_version3,
  63 #endif
  64 #ifdef CONFIG_NFS_V4
  65         [4]                     = &nfs_version4,
  66 #endif
  67 };
  68
  69 struct rpc_program nfs_program = {
  70         .name                   = "nfs",
  71         .number                 = NFS_PROGRAM,
  72         .nrvers                 = ARRAY_SIZE(nfs_version),
  73         .version                = nfs_version,
  74         .stats                  = &nfs_rpcstat,
  75         .pipe_dir_name          = "/nfs",
  76 };
  77
  78 struct rpc_stat nfs_rpcstat = {
  79         .program                = &nfs_program
  80 };
  81
  82
  83 #ifdef CONFIG_NFS_V3_ACL
  84 static struct rpc_stat          nfsacl_rpcstat = { &nfsacl_program };
  85 static struct rpc_version *     nfsacl_version[] = {
  86         [3]                     = &nfsacl_version3,
  87 };
  88
  89 struct rpc_program              nfsacl_program = {
  90         .name                   = "nfsacl",
  91         .number                 = NFS_ACL_PROGRAM,
  92         .nrvers                 = ARRAY_SIZE(nfsacl_version),
  93         .version                = nfsacl_version,
  94         .stats                  = &nfsacl_rpcstat,
  95 };
  96 #endif  /* CONFIG_NFS_V3_ACL */
  97
  98 struct nfs_client_initdata {
  99         const char *hostname;
 100         const struct sockaddr *addr;
 101         size_t addrlen;
 102         const struct nfs_rpc_ops *rpc_ops;
 103         int proto;
 104 };
 105
 106 /*
 107  * Allocate a shared client record
 108  *
 109  * Since these are allocated/deallocated very rarely, we don't
 110  * bother putting them in a slab cache...
 111  */
 112 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
 113 {
 114         struct nfs_client *clp;
 115         struct rpc_cred *cred;
 116
 117         if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
 118                 goto error_0;
 119
 120         clp->rpc_ops = cl_init->rpc_ops;
 121
 122         if (cl_init->rpc_ops->version == 4) {
 123                 if (nfs_callback_up() < 0)
 124                         goto error_2;
 125                 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 126         }
 127
 128         atomic_set(&clp->cl_count, 1);
 129         clp->cl_cons_state = NFS_CS_INITING;
 130
 131         memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
 132         clp->cl_addrlen = cl_init->addrlen;
 133
 134         if (cl_init->hostname) {
 135                 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
 136                 if (!clp->cl_hostname)
 137                         goto error_3;
 138         }
 139
 140         INIT_LIST_HEAD(&clp->cl_superblocks);
 141         clp->cl_rpcclient = ERR_PTR(-EINVAL);
 142
 143         clp->cl_proto = cl_init->proto;
 144
 145 #ifdef CONFIG_NFS_V4
 146         init_rwsem(&clp->cl_sem);
 147         INIT_LIST_HEAD(&clp->cl_delegations);
 148         spin_lock_init(&clp->cl_lock);
 149         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
 150         rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
 151         clp->cl_boot_time = CURRENT_TIME;
 152         clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
 153 #endif
 154         cred = rpc_lookup_machine_cred();
 155         if (!IS_ERR(cred))
 156                 clp->cl_machine_cred = cred;
 157
 158         return clp;
 159
 160 error_3:
 161         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
 162                 nfs_callback_down();
 163 error_2:
 164         kfree(clp);
 165 error_0:
 166         return NULL;
 167 }
 168
 169 static void nfs4_shutdown_client(struct nfs_client *clp)
 170 {
 171 #ifdef CONFIG_NFS_V4
 172         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
 173                 nfs4_kill_renewd(clp);
 174         BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
 175         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
 176                 nfs_idmap_delete(clp);
 177
 178         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 179 #endif
 180 }
 181
 182 /*
 183  * Destroy a shared client record
 184  */
 185 static void nfs_free_client(struct nfs_client *clp)
 186 {
 187         dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
 188
 189         nfs4_shutdown_client(clp);
 190
 191         /* -EIO all pending I/O */
 192         if (!IS_ERR(clp->cl_rpcclient))
 193                 rpc_shutdown_client(clp->cl_rpcclient);
 194
 195         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
 196                 nfs_callback_down();
 197
 198         if (clp->cl_machine_cred != NULL)
 199                 put_rpccred(clp->cl_machine_cred);
 200
 201         kfree(clp->cl_hostname);
 202         kfree(clp);
 203
 204         dprintk("<-- nfs_free_client()\n");
 205 }
 206
 207 /*
 208  * Release a reference to a shared client record
 209  */
 210 void nfs_put_client(struct nfs_client *clp)
 211 {
 212         if (!clp)
 213                 return;
 214
 215         dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
 216
 217         if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
 218                 list_del(&clp->cl_share_link);
 219                 spin_unlock(&nfs_client_lock);
 220
 221                 BUG_ON(!list_empty(&clp->cl_superblocks));
 222
 223                 nfs_free_client(clp);
 224         }
 225 }
 226
 227 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
 228                                  const struct sockaddr_in *sa2)
 229 {
 230         return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
 231 }
 232
 233 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
 234                                  const struct sockaddr_in6 *sa2)
 235 {
 236         return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
 237 }
 238
 239 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
 240                                  const struct sockaddr *sa2)
 241 {
 242         switch (sa1->sa_family) {
 243         case AF_INET:
 244                 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
 245                                 (const struct sockaddr_in *)sa2);
 246         case AF_INET6:
 247                 return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
 248                                 (const struct sockaddr_in6 *)sa2);
 249         }
 250         BUG();
 251 }
 252
 253 /*
 254  * Find a client by IP address and protocol version
 255  * - returns NULL if no such client
 256  */
 257 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
 258 {
 259         struct nfs_client *clp;
 260
 261         spin_lock(&nfs_client_lock);
 262         list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
 263                 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 264
 265                 /* Don't match clients that failed to initialise properly */
 266                 if (clp->cl_cons_state != NFS_CS_READY)
 267                         continue;
 268
 269                 /* Different NFS versions cannot share the same nfs_client */
 270                 if (clp->rpc_ops->version != nfsversion)
 271                         continue;
 272
 273                 if (addr->sa_family != clap->sa_family)
 274                         continue;
 275                 /* Match only the IP address, not the port number */
 276                 if (!nfs_sockaddr_match_ipaddr(addr, clap))
 277                         continue;
 278
 279                 atomic_inc(&clp->cl_count);
 280                 spin_unlock(&nfs_client_lock);
 281                 return clp;
 282         }
 283         spin_unlock(&nfs_client_lock);
 284         return NULL;
 285 }
 286
 287 /*
 288  * Find a client by IP address and protocol version
 289  * - returns NULL if no such client
 290  */
 291 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
 292 {
 293         struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
 294         u32 nfsvers = clp->rpc_ops->version;
 295
 296         spin_lock(&nfs_client_lock);
 297         list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
 298                 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 299
 300                 /* Don't match clients that failed to initialise properly */
 301                 if (clp->cl_cons_state != NFS_CS_READY)
 302                         continue;
 303
 304                 /* Different NFS versions cannot share the same nfs_client */
 305                 if (clp->rpc_ops->version != nfsvers)
 306                         continue;
 307
 308                 if (sap->sa_family != clap->sa_family)
 309                         continue;
 310                 /* Match only the IP address, not the port number */
 311                 if (!nfs_sockaddr_match_ipaddr(sap, clap))
 312                         continue;
 313
 314                 atomic_inc(&clp->cl_count);
 315                 spin_unlock(&nfs_client_lock);
 316                 return clp;
 317         }
 318         spin_unlock(&nfs_client_lock);
 319         return NULL;
 320 }
 321
 322 /*
 323  * Find an nfs_client on the list that matches the initialisation data
 324  * that is supplied.
 325  */
 326 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
 327 {
 328         struct nfs_client *clp;
 329
 330         list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
 331                 /* Don't match clients that failed to initialise properly */
 332                 if (clp->cl_cons_state < 0)
 333                         continue;
 334
 335                 /* Different NFS versions cannot share the same nfs_client */
 336                 if (clp->rpc_ops != data->rpc_ops)
 337                         continue;
 338
 339                 if (clp->cl_proto != data->proto)
 340                         continue;
 341
 342                 /* Match the full socket address */
 343                 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
 344                         continue;
 345
 346                 atomic_inc(&clp->cl_count);
 347                 return clp;
 348         }
 349         return NULL;
 350 }
 351
 352 /*
 353  * Look up a client by IP address and protocol version
 354  * - creates a new record if one doesn't yet exist
 355  */
 356 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
 357 {
 358         struct nfs_client *clp, *new = NULL;
 359         int error;
 360
 361         dprintk("--> nfs_get_client(%s,v%u)\n",
 362                 cl_init->hostname ?: "", cl_init->rpc_ops->version);
 363
 364         /* see if the client already exists */
 365         do {
 366                 spin_lock(&nfs_client_lock);
 367
 368                 clp = nfs_match_client(cl_init);
 369                 if (clp)
 370                         goto found_client;
 371                 if (new)
 372                         goto install_client;
 373
 374                 spin_unlock(&nfs_client_lock);
 375
 376                 new = nfs_alloc_client(cl_init);
 377         } while (new);
 378
 379         return ERR_PTR(-ENOMEM);
 380
 381         /* install a new client and return with it unready */
 382 install_client:
 383         clp = new;
 384         list_add(&clp->cl_share_link, &nfs_client_list);
 385         spin_unlock(&nfs_client_lock);
 386         dprintk("--> nfs_get_client() = %p [new]\n", clp);
 387         return clp;
 388
 389         /* found an existing client
 390          * - make sure it's ready before returning
 391          */
 392 found_client:
 393         spin_unlock(&nfs_client_lock);
 394
 395         if (new)
 396                 nfs_free_client(new);
 397
 398         error = wait_event_killable(nfs_client_active_wq,
 399                                 clp->cl_cons_state != NFS_CS_INITING);
 400         if (error < 0) {
 401                 nfs_put_client(clp);
 402                 return ERR_PTR(-ERESTARTSYS);
 403         }
 404
 405         if (clp->cl_cons_state < NFS_CS_READY) {
 406                 error = clp->cl_cons_state;
 407                 nfs_put_client(clp);
 408                 return ERR_PTR(error);
 409         }
 410
 411         BUG_ON(clp->cl_cons_state != NFS_CS_READY);
 412
 413         dprintk("--> nfs_get_client() = %p [share]\n", clp);
 414         return clp;
 415 }
 416
 417 /*
 418  * Mark a server as ready or failed
 419  */
 420 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
 421 {
 422         clp->cl_cons_state = state;
 423         wake_up_all(&nfs_client_active_wq);
 424 }
 425
 426 /*
 427  * Initialise the timeout values for a connection
 428  */
 429 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
 430                                     unsigned int timeo, unsigned int retrans)
 431 {
 432         to->to_initval = timeo * HZ / 10;
 433         to->to_retries = retrans;
 434
 435         switch (proto) {
 436         case XPRT_TRANSPORT_TCP:
 437         case XPRT_TRANSPORT_RDMA:
 438                 if (to->to_retries == 0)
 439                         to->to_retries = NFS_DEF_TCP_RETRANS;
 440                 if (to->to_initval == 0)
 441                         to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
 442                 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
 443                         to->to_initval = NFS_MAX_TCP_TIMEOUT;
 444                 to->to_increment = to->to_initval;
 445                 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
 446                 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
 447                         to->to_maxval = NFS_MAX_TCP_TIMEOUT;
 448                 if (to->to_maxval < to->to_initval)
 449                         to->to_maxval = to->to_initval;
 450                 to->to_exponential = 0;
 451                 break;
 452         case XPRT_TRANSPORT_UDP:
 453                 if (to->to_retries == 0)
 454                         to->to_retries = NFS_DEF_UDP_RETRANS;
 455                 if (!to->to_initval)
 456                         to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
 457                 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
 458                         to->to_initval = NFS_MAX_UDP_TIMEOUT;
 459                 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
 460                 to->to_exponential = 1;
 461                 break;
 462         default:
 463                 BUG();
 464         }
 465 }
 466
 467 /*
 468  * Create an RPC client handle
 469  */
 470 static int nfs_create_rpc_client(struct nfs_client *clp,
 471                                  const struct rpc_timeout *timeparms,
 472                                  rpc_authflavor_t flavor,
 473                                  int flags)
 474 {
 475         struct rpc_clnt         *clnt = NULL;
 476         struct rpc_create_args args = {
 477                 .protocol       = clp->cl_proto,
 478                 .address        = (struct sockaddr *)&clp->cl_addr,
 479                 .addrsize       = clp->cl_addrlen,
 480                 .timeout        = timeparms,
 481                 .servername     = clp->cl_hostname,
 482                 .program        = &nfs_program,
 483                 .version        = clp->rpc_ops->version,
 484                 .authflavor     = flavor,
 485                 .flags          = flags,
 486         };
 487
 488         if (!IS_ERR(clp->cl_rpcclient))
 489                 return 0;
 490
 491         clnt = rpc_create(&args);
 492         if (IS_ERR(clnt)) {
 493                 dprintk("%s: cannot create RPC client. Error = %ld\n",
 494                                 __func__, PTR_ERR(clnt));
 495                 return PTR_ERR(clnt);
 496         }
 497
 498         clp->cl_rpcclient = clnt;
 499         return 0;
 500 }
 501
 502 /*
 503  * Version 2 or 3 client destruction
 504  */
 505 static void nfs_destroy_server(struct nfs_server *server)
 506 {
 507         if (!(server->flags & NFS_MOUNT_NONLM))
 508                 nlmclnt_done(server->nlm_host);
 509 }
 510
 511 /*
 512  * Version 2 or 3 lockd setup
 513  */
 514 static int nfs_start_lockd(struct nfs_server *server)
 515 {
 516         struct nlm_host *host;
 517         struct nfs_client *clp = server->nfs_client;
 518         struct nlmclnt_initdata nlm_init = {
 519                 .hostname       = clp->cl_hostname,
 520                 .address        = (struct sockaddr *)&clp->cl_addr,
 521                 .addrlen        = clp->cl_addrlen,
 522                 .protocol       = server->flags & NFS_MOUNT_TCP ?
 523                                                 IPPROTO_TCP : IPPROTO_UDP,
 524                 .nfs_version    = clp->rpc_ops->version,
 525         };
 526
 527         if (nlm_init.nfs_version > 3)
 528                 return 0;
 529         if (server->flags & NFS_MOUNT_NONLM)
 530                 return 0;
 531
 532         host = nlmclnt_init(&nlm_init);
 533         if (IS_ERR(host))
 534                 return PTR_ERR(host);
 535
 536         server->nlm_host = host;
 537         server->destroy = nfs_destroy_server;
 538         return 0;
 539 }
 540
 541 /*
 542  * Initialise an NFSv3 ACL client connection
 543  */
 544 #ifdef CONFIG_NFS_V3_ACL
 545 static void nfs_init_server_aclclient(struct nfs_server *server)
 546 {
 547         if (server->nfs_client->rpc_ops->version != 3)
 548                 goto out_noacl;
 549         if (server->flags & NFS_MOUNT_NOACL)
 550                 goto out_noacl;
 551
 552         server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
 553         if (IS_ERR(server->client_acl))
 554                 goto out_noacl;
 555
 556         /* No errors! Assume that Sun nfsacls are supported */
 557         server->caps |= NFS_CAP_ACLS;
 558         return;
 559
 560 out_noacl:
 561         server->caps &= ~NFS_CAP_ACLS;
 562 }
 563 #else
 564 static inline void nfs_init_server_aclclient(struct nfs_server *server)
 565 {
 566         server->flags &= ~NFS_MOUNT_NOACL;
 567         server->caps &= ~NFS_CAP_ACLS;
 568 }
 569 #endif
 570
 571 /*
 572  * Create a general RPC client
 573  */
 574 static int nfs_init_server_rpcclient(struct nfs_server *server,
 575                 const struct rpc_timeout *timeo,
 576                 rpc_authflavor_t pseudoflavour)
 577 {
 578         struct nfs_client *clp = server->nfs_client;
 579
 580         server->client = rpc_clone_client(clp->cl_rpcclient);
 581         if (IS_ERR(server->client)) {
 582                 dprintk("%s: couldn't create rpc_client!\n", __func__);
 583                 return PTR_ERR(server->client);
 584         }
 585
 586         memcpy(&server->client->cl_timeout_default,
 587                         timeo,
 588                         sizeof(server->client->cl_timeout_default));
 589         server->client->cl_timeout = &server->client->cl_timeout_default;
 590
 591         if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
 592                 struct rpc_auth *auth;
 593
 594                 auth = rpcauth_create(pseudoflavour, server->client);
 595                 if (IS_ERR(auth)) {
 596                         dprintk("%s: couldn't create credcache!\n", __func__);
 597                         return PTR_ERR(auth);
 598                 }
 599         }
 600         server->client->cl_softrtry = 0;
 601         if (server->flags & NFS_MOUNT_SOFT)
 602                 server->client->cl_softrtry = 1;
 603
 604         return 0;
 605 }
 606
 607 /*
 608  * Initialise an NFS2 or NFS3 client
 609  */
 610 static int nfs_init_client(struct nfs_client *clp,
 611                            const struct rpc_timeout *timeparms,
 612                            const struct nfs_parsed_mount_data *data)
 613 {
 614         int error;
 615
 616         if (clp->cl_cons_state == NFS_CS_READY) {
 617                 /* the client is already initialised */
 618                 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
 619                 return 0;
 620         }
 621
 622         /*
 623          * Create a client RPC handle for doing FSSTAT with UNIX auth only
 624          * - RFC 2623, sec 2.3.2
 625          */
 626         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 0);
 627         if (error < 0)
 628                 goto error;
 629         nfs_mark_client_ready(clp, NFS_CS_READY);
 630         return 0;
 631
 632 error:
 633         nfs_mark_client_ready(clp, error);
 634         dprintk("<-- nfs_init_client() = xerror %d\n", error);
 635         return error;
 636 }
 637
 638 /*
 639  * Create a version 2 or 3 client
 640  */
 641 static int nfs_init_server(struct nfs_server *server,
 642                            const struct nfs_parsed_mount_data *data)
 643 {
 644         struct nfs_client_initdata cl_init = {
 645                 .hostname = data->nfs_server.hostname,
 646                 .addr = (const struct sockaddr *)&data->nfs_server.address,
 647                 .addrlen = data->nfs_server.addrlen,
 648                 .rpc_ops = &nfs_v2_clientops,
 649                 .proto = data->nfs_server.protocol,
 650         };
 651         struct rpc_timeout timeparms;
 652         struct nfs_client *clp;
 653         int error;
 654
 655         dprintk("--> nfs_init_server()\n");
 656
 657 #ifdef CONFIG_NFS_V3
 658         if (data->flags & NFS_MOUNT_VER3)
 659                 cl_init.rpc_ops = &nfs_v3_clientops;
 660 #endif
 661
 662         /* Allocate or find a client reference we can use */
 663         clp = nfs_get_client(&cl_init);
 664         if (IS_ERR(clp)) {
 665                 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
 666                 return PTR_ERR(clp);
 667         }
 668
 669         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 670                         data->timeo, data->retrans);
 671         error = nfs_init_client(clp, &timeparms, data);
 672         if (error < 0)
 673                 goto error;
 674
 675         server->nfs_client = clp;
 676
 677         /* Initialise the client representation from the mount data */
 678         server->flags = data->flags & NFS_MOUNT_FLAGMASK;
 679
 680         if (data->rsize)
 681                 server->rsize = nfs_block_size(data->rsize, NULL);
 682         if (data->wsize)
 683                 server->wsize = nfs_block_size(data->wsize, NULL);
 684
 685         server->acregmin = data->acregmin * HZ;
 686         server->acregmax = data->acregmax * HZ;
 687         server->acdirmin = data->acdirmin * HZ;
 688         server->acdirmax = data->acdirmax * HZ;
 689
 690         /* Start lockd here, before we might error out */
 691         error = nfs_start_lockd(server);
 692         if (error < 0)
 693                 goto error;
 694
 695         server->port = data->nfs_server.port;
 696
 697         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 698         if (error < 0)
 699                 goto error;
 700
 701         /* Preserve the values of mount_server-related mount options */
 702         if (data->mount_server.addrlen) {
 703                 memcpy(&server->mountd_address, &data->mount_server.address,
 704                         data->mount_server.addrlen);
 705                 server->mountd_addrlen = data->mount_server.addrlen;
 706         }
 707         server->mountd_version = data->mount_server.version;
 708         server->mountd_port = data->mount_server.port;
 709         server->mountd_protocol = data->mount_server.protocol;
 710
 711         server->namelen  = data->namlen;
 712         /* Create a client RPC handle for the NFSv3 ACL management interface */
 713         nfs_init_server_aclclient(server);
 714         dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
 715         return 0;
 716
 717 error:
 718         server->nfs_client = NULL;
 719         nfs_put_client(clp);
 720         dprintk("<-- nfs_init_server() = xerror %d\n", error);
 721         return error;
 722 }
 723
 724 /*
 725  * Load up the server record from information gained in an fsinfo record
 726  */
 727 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
 728 {
 729         unsigned long max_rpc_payload;
 730
 731         /* Work out a lot of parameters */
 732         if (server->rsize == 0)
 733                 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
 734         if (server->wsize == 0)
 735                 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
 736
 737         if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
 738                 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
 739         if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
 740                 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
 741
 742         max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
 743         if (server->rsize > max_rpc_payload)
 744                 server->rsize = max_rpc_payload;
 745         if (server->rsize > NFS_MAX_FILE_IO_SIZE)
 746                 server->rsize = NFS_MAX_FILE_IO_SIZE;
 747         server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 748
 749         server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
 750
 751         if (server->wsize > max_rpc_payload)
 752                 server->wsize = max_rpc_payload;
 753         if (server->wsize > NFS_MAX_FILE_IO_SIZE)
 754                 server->wsize = NFS_MAX_FILE_IO_SIZE;
 755         server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 756         server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
 757
 758         server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
 759         if (server->dtsize > PAGE_CACHE_SIZE)
 760                 server->dtsize = PAGE_CACHE_SIZE;
 761         if (server->dtsize > server->rsize)
 762                 server->dtsize = server->rsize;
 763
 764         if (server->flags & NFS_MOUNT_NOAC) {
 765                 server->acregmin = server->acregmax = 0;
 766                 server->acdirmin = server->acdirmax = 0;
 767         }
 768
 769         server->maxfilesize = fsinfo->maxfilesize;
 770
 771         /* We're airborne Set socket buffersize */
 772         rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
 773 }
 774
 775 /*
 776  * Probe filesystem information, including the FSID on v2/v3
 777  */
 778 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
 779 {
 780         struct nfs_fsinfo fsinfo;
 781         struct nfs_client *clp = server->nfs_client;
 782         int error;
 783
 784         dprintk("--> nfs_probe_fsinfo()\n");
 785
 786         if (clp->rpc_ops->set_capabilities != NULL) {
 787                 error = clp->rpc_ops->set_capabilities(server, mntfh);
 788                 if (error < 0)
 789                         goto out_error;
 790         }
 791
 792         fsinfo.fattr = fattr;
 793         nfs_fattr_init(fattr);
 794         error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
 795         if (error < 0)
 796                 goto out_error;
 797
 798         nfs_server_set_fsinfo(server, &fsinfo);
 799         error = bdi_init(&server->backing_dev_info);
 800         if (error)
 801                 goto out_error;
 802
 803
 804         /* Get some general file system info */
 805         if (server->namelen == 0) {
 806                 struct nfs_pathconf pathinfo;
 807
 808                 pathinfo.fattr = fattr;
 809                 nfs_fattr_init(fattr);
 810
 811                 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
 812                         server->namelen = pathinfo.max_namelen;
 813         }
 814
 815         dprintk("<-- nfs_probe_fsinfo() = 0\n");
 816         return 0;
 817
 818 out_error:
 819         dprintk("nfs_probe_fsinfo: error = %d\n", -error);
 820         return error;
 821 }
 822
 823 /*
 824  * Copy useful information when duplicating a server record
 825  */
 826 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
 827 {
 828         target->flags = source->flags;
 829         target->rsize = source->rsize;
 830         target->wsize = source->wsize;
 831         target->acregmin = source->acregmin;
 832         target->acregmax = source->acregmax;
 833         target->acdirmin = source->acdirmin;
 834         target->acdirmax = source->acdirmax;
 835         target->caps = source->caps;
 836 }
 837
 838 /*
 839  * Allocate and initialise a server record
 840  */
 841 static struct nfs_server *nfs_alloc_server(void)
 842 {
 843         struct nfs_server *server;
 844
 845         server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
 846         if (!server)
 847                 return NULL;
 848
 849         server->client = server->client_acl = ERR_PTR(-EINVAL);
 850
 851         /* Zero out the NFS state stuff */
 852         INIT_LIST_HEAD(&server->client_link);
 853         INIT_LIST_HEAD(&server->master_link);
 854
 855         init_waitqueue_head(&server->active_wq);
 856         atomic_set(&server->active, 0);
 857
 858         server->io_stats = nfs_alloc_iostats();
 859         if (!server->io_stats) {
 860                 kfree(server);
 861                 return NULL;
 862         }
 863
 864         return server;
 865 }
 866
 867 /*
 868  * Free up a server record
 869  */
 870 void nfs_free_server(struct nfs_server *server)
 871 {
 872         dprintk("--> nfs_free_server()\n");
 873
 874         spin_lock(&nfs_client_lock);
 875         list_del(&server->client_link);
 876         list_del(&server->master_link);
 877         spin_unlock(&nfs_client_lock);
 878
 879         if (server->destroy != NULL)
 880                 server->destroy(server);
 881
 882         if (!IS_ERR(server->client_acl))
 883                 rpc_shutdown_client(server->client_acl);
 884         if (!IS_ERR(server->client))
 885                 rpc_shutdown_client(server->client);
 886
 887         nfs_put_client(server->nfs_client);
 888
 889         nfs_free_iostats(server->io_stats);
 890         bdi_destroy(&server->backing_dev_info);
 891         kfree(server);
 892         nfs_release_automount_timer();
 893         dprintk("<-- nfs_free_server()\n");
 894 }
 895
 896 /*
 897  * Create a version 2 or 3 volume record
 898  * - keyed on server and FSID
 899  */
 900 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
 901                                      struct nfs_fh *mntfh)
 902 {
 903         struct nfs_server *server;
 904         struct nfs_fattr fattr;
 905         int error;
 906
 907         server = nfs_alloc_server();
 908         if (!server)
 909                 return ERR_PTR(-ENOMEM);
 910
 911         /* Get a client representation */
 912         error = nfs_init_server(server, data);
 913         if (error < 0)
 914                 goto error;
 915
 916         BUG_ON(!server->nfs_client);
 917         BUG_ON(!server->nfs_client->rpc_ops);
 918         BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
 919
 920         /* Probe the root fh to retrieve its FSID */
 921         error = nfs_probe_fsinfo(server, mntfh, &fattr);
 922         if (error < 0)
 923                 goto error;
 924         if (server->nfs_client->rpc_ops->version == 3) {
 925                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
 926                         server->namelen = NFS3_MAXNAMLEN;
 927                 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
 928                         server->caps |= NFS_CAP_READDIRPLUS;
 929         } else {
 930                 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
 931                         server->namelen = NFS2_MAXNAMLEN;
 932         }
 933
 934         if (!(fattr.valid & NFS_ATTR_FATTR)) {
 935                 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
 936                 if (error < 0) {
 937                         dprintk("nfs_create_server: getattr error = %d\n", -error);
 938                         goto error;
 939                 }
 940         }
 941         memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
 942
 943         dprintk("Server FSID: %llx:%llx\n",
 944                 (unsigned long long) server->fsid.major,
 945                 (unsigned long long) server->fsid.minor);
 946
 947         BUG_ON(!server->nfs_client);
 948         BUG_ON(!server->nfs_client->rpc_ops);
 949         BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
 950
 951         spin_lock(&nfs_client_lock);
 952         list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
 953         list_add_tail(&server->master_link, &nfs_volume_list);
 954         spin_unlock(&nfs_client_lock);
 955
 956         server->mount_time = jiffies;
 957         return server;
 958
 959 error:
 960         nfs_free_server(server);
 961         return ERR_PTR(error);
 962 }
 963
 964 #ifdef CONFIG_NFS_V4
 965 /*
 966  * Initialise an NFS4 client record
 967  */
 968 static int nfs4_init_client(struct nfs_client *clp,
 969                 const struct rpc_timeout *timeparms,
 970                 const char *ip_addr,
 971                 rpc_authflavor_t authflavour)
 972 {
 973         int error;
 974
 975         if (clp->cl_cons_state == NFS_CS_READY) {
 976                 /* the client is initialised already */
 977                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 978                 return 0;
 979         }
 980
 981         /* Check NFS protocol revision and initialize RPC op vector */
 982         clp->rpc_ops = &nfs_v4_clientops;
 983
 984         error = nfs_create_rpc_client(clp, timeparms, authflavour,
 985                                         RPC_CLNT_CREATE_DISCRTRY);
 986         if (error < 0)
 987                 goto error;
 988         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 989
 990         error = nfs_idmap_new(clp);
 991         if (error < 0) {
 992                 dprintk("%s: failed to create idmapper. Error = %d\n",
 993                         __func__, error);
 994                 goto error;
 995         }
 996         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 997
 998         nfs_mark_client_ready(clp, NFS_CS_READY);
 999         return 0;
1000
1001 error:
1002         nfs_mark_client_ready(clp, error);
1003         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1004         return error;
1005 }
1006
1007 /*
1008  * Set up an NFS4 client
1009  */
1010 static int nfs4_set_client(struct nfs_server *server,
1011                 const char *hostname,
1012                 const struct sockaddr *addr,
1013                 const size_t addrlen,
1014                 const char *ip_addr,
1015                 rpc_authflavor_t authflavour,
1016                 int proto, const struct rpc_timeout *timeparms)
1017 {
1018         struct nfs_client_initdata cl_init = {
1019                 .hostname = hostname,
1020                 .addr = addr,
1021                 .addrlen = addrlen,
1022                 .rpc_ops = &nfs_v4_clientops,
1023                 .proto = proto,
1024         };
1025         struct nfs_client *clp;
1026         int error;
1027
1028         dprintk("--> nfs4_set_client()\n");
1029
1030         /* Allocate or find a client reference we can use */
1031         clp = nfs_get_client(&cl_init);
1032         if (IS_ERR(clp)) {
1033                 error = PTR_ERR(clp);
1034                 goto error;
1035         }
1036         error = nfs4_init_client(clp, timeparms, ip_addr, authflavour);
1037         if (error < 0)
1038                 goto error_put;
1039
1040         server->nfs_client = clp;
1041         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1042         return 0;
1043
1044 error_put:
1045         nfs_put_client(clp);
1046 error:
1047         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1048         return error;
1049 }
1050
1051 /*
1052  * Create a version 4 volume record
1053  */
1054 static int nfs4_init_server(struct nfs_server *server,
1055                 const struct nfs_parsed_mount_data *data)
1056 {
1057         struct rpc_timeout timeparms;
1058         int error;
1059
1060         dprintk("--> nfs4_init_server()\n");
1061
1062         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1063                         data->timeo, data->retrans);
1064
1065         /* Get a client record */
1066         error = nfs4_set_client(server,
1067                         data->nfs_server.hostname,
1068                         (const struct sockaddr *)&data->nfs_server.address,
1069                         data->nfs_server.addrlen,
1070                         data->client_address,
1071                         data->auth_flavors[0],
1072                         data->nfs_server.protocol,
1073                         &timeparms);
1074         if (error < 0)
1075                 goto error;
1076
1077         /* Initialise the client representation from the mount data */
1078         server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1079         server->caps |= NFS_CAP_ATOMIC_OPEN;
1080
1081         if (data->rsize)
1082                 server->rsize = nfs_block_size(data->rsize, NULL);
1083         if (data->wsize)
1084                 server->wsize = nfs_block_size(data->wsize, NULL);
1085
1086         server->acregmin = data->acregmin * HZ;
1087         server->acregmax = data->acregmax * HZ;
1088         server->acdirmin = data->acdirmin * HZ;
1089         server->acdirmax = data->acdirmax * HZ;
1090
1091         server->port = data->nfs_server.port;
1092
1093         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1094
1095 error:
1096         /* Done */
1097         dprintk("<-- nfs4_init_server() = %d\n", error);
1098         return error;
1099 }
1100
1101 /*
1102  * Create a version 4 volume record
1103  * - keyed on server and FSID
1104  */
1105 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1106                                       struct nfs_fh *mntfh)
1107 {
1108         struct nfs_fattr fattr;
1109         struct nfs_server *server;
1110         int error;
1111
1112         dprintk("--> nfs4_create_server()\n");
1113
1114         server = nfs_alloc_server();
1115         if (!server)
1116                 return ERR_PTR(-ENOMEM);
1117
1118         /* set up the general RPC client */
1119         error = nfs4_init_server(server, data);
1120         if (error < 0)
1121                 goto error;
1122
1123         BUG_ON(!server->nfs_client);
1124         BUG_ON(!server->nfs_client->rpc_ops);
1125         BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1126
1127         /* Probe the root fh to retrieve its FSID */
1128         error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1129         if (error < 0)
1130                 goto error;
1131
1132         dprintk("Server FSID: %llx:%llx\n",
1133                 (unsigned long long) server->fsid.major,
1134                 (unsigned long long) server->fsid.minor);
1135         dprintk("Mount FH: %d\n", mntfh->size);
1136
1137         error = nfs_probe_fsinfo(server, mntfh, &fattr);
1138         if (error < 0)
1139                 goto error;
1140
1141         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1142                 server->namelen = NFS4_MAXNAMLEN;
1143
1144         BUG_ON(!server->nfs_client);
1145         BUG_ON(!server->nfs_client->rpc_ops);
1146         BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1147
1148         spin_lock(&nfs_client_lock);
1149         list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1150         list_add_tail(&server->master_link, &nfs_volume_list);
1151         spin_unlock(&nfs_client_lock);
1152
1153         server->mount_time = jiffies;
1154         dprintk("<-- nfs4_create_server() = %p\n", server);
1155         return server;
1156
1157 error:
1158         nfs_free_server(server);
1159         dprintk("<-- nfs4_create_server() = error %d\n", error);
1160         return ERR_PTR(error);
1161 }
1162
1163 /*
1164  * Create an NFS4 referral server record
1165  */
1166 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1167                                                struct nfs_fh *mntfh)
1168 {
1169         struct nfs_client *parent_client;
1170         struct nfs_server *server, *parent_server;
1171         struct nfs_fattr fattr;
1172         int error;
1173
1174         dprintk("--> nfs4_create_referral_server()\n");
1175
1176         server = nfs_alloc_server();
1177         if (!server)
1178                 return ERR_PTR(-ENOMEM);
1179
1180         parent_server = NFS_SB(data->sb);
1181         parent_client = parent_server->nfs_client;
1182
1183         /* Get a client representation.
1184          * Note: NFSv4 always uses TCP, */
1185         error = nfs4_set_client(server, data->hostname,
1186                                 data->addr,
1187                                 data->addrlen,
1188                                 parent_client->cl_ipaddr,
1189                                 data->authflavor,
1190                                 parent_server->client->cl_xprt->prot,
1191                                 parent_server->client->cl_timeout);
1192         if (error < 0)
1193                 goto error;
1194
1195         /* Initialise the client representation from the parent server */
1196         nfs_server_copy_userdata(server, parent_server);
1197         server->caps |= NFS_CAP_ATOMIC_OPEN;
1198
1199         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1200         if (error < 0)
1201                 goto error;
1202
1203         BUG_ON(!server->nfs_client);
1204         BUG_ON(!server->nfs_client->rpc_ops);
1205         BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1206
1207         /* Probe the root fh to retrieve its FSID and filehandle */
1208         error = nfs4_path_walk(server, mntfh, data->mnt_path);
1209         if (error < 0)
1210                 goto error;
1211
1212         /* probe the filesystem info for this server filesystem */
1213         error = nfs_probe_fsinfo(server, mntfh, &fattr);
1214         if (error < 0)
1215                 goto error;
1216
1217         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1218                 server->namelen = NFS4_MAXNAMLEN;
1219
1220         dprintk("Referral FSID: %llx:%llx\n",
1221                 (unsigned long long) server->fsid.major,
1222                 (unsigned long long) server->fsid.minor);
1223
1224         spin_lock(&nfs_client_lock);
1225         list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1226         list_add_tail(&server->master_link, &nfs_volume_list);
1227         spin_unlock(&nfs_client_lock);
1228
1229         server->mount_time = jiffies;
1230
1231         dprintk("<-- nfs_create_referral_server() = %p\n", server);
1232         return server;
1233
1234 error:
1235         nfs_free_server(server);
1236         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1237         return ERR_PTR(error);
1238 }
1239
1240 #endif /* CONFIG_NFS_V4 */
1241
1242 /*
1243  * Clone an NFS2, NFS3 or NFS4 server record
1244  */
1245 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1246                                     struct nfs_fh *fh,
1247                                     struct nfs_fattr *fattr)
1248 {
1249         struct nfs_server *server;
1250         struct nfs_fattr fattr_fsinfo;
1251         int error;
1252
1253         dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1254                 (unsigned long long) fattr->fsid.major,
1255                 (unsigned long long) fattr->fsid.minor);
1256
1257         server = nfs_alloc_server();
1258         if (!server)
1259                 return ERR_PTR(-ENOMEM);
1260
1261         /* Copy data from the source */
1262         server->nfs_client = source->nfs_client;
1263         atomic_inc(&server->nfs_client->cl_count);
1264         nfs_server_copy_userdata(server, source);
1265
1266         server->fsid = fattr->fsid;
1267
1268         error = nfs_init_server_rpcclient(server,
1269                         source->client->cl_timeout,
1270                         source->client->cl_auth->au_flavor);
1271         if (error < 0)
1272                 goto out_free_server;
1273         if (!IS_ERR(source->client_acl))
1274                 nfs_init_server_aclclient(server);
1275
1276         /* probe the filesystem info for this server filesystem */
1277         error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1278         if (error < 0)
1279                 goto out_free_server;
1280
1281         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1282                 server->namelen = NFS4_MAXNAMLEN;
1283
1284         dprintk("Cloned FSID: %llx:%llx\n",
1285                 (unsigned long long) server->fsid.major,
1286                 (unsigned long long) server->fsid.minor);
1287
1288         error = nfs_start_lockd(server);
1289         if (error < 0)
1290                 goto out_free_server;
1291
1292         spin_lock(&nfs_client_lock);
1293         list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1294         list_add_tail(&server->master_link, &nfs_volume_list);
1295         spin_unlock(&nfs_client_lock);
1296
1297         server->mount_time = jiffies;
1298
1299         dprintk("<-- nfs_clone_server() = %p\n", server);
1300         return server;
1301
1302 out_free_server:
1303         nfs_free_server(server);
1304         dprintk("<-- nfs_clone_server() = error %d\n", error);
1305         return ERR_PTR(error);
1306 }
1307
1308 #ifdef CONFIG_PROC_FS
1309 static struct proc_dir_entry *proc_fs_nfs;
1310
1311 static int nfs_server_list_open(struct inode *inode, struct file *file);
1312 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1313 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1314 static void nfs_server_list_stop(struct seq_file *p, void *v);
1315 static int nfs_server_list_show(struct seq_file *m, void *v);
1316
1317 static struct seq_operations nfs_server_list_ops = {
1318         .start  = nfs_server_list_start,
1319         .next   = nfs_server_list_next,
1320         .stop   = nfs_server_list_stop,
1321         .show   = nfs_server_list_show,
1322 };
1323
1324 static const struct file_operations nfs_server_list_fops = {
1325         .open           = nfs_server_list_open,
1326         .read           = seq_read,
1327         .llseek         = seq_lseek,
1328         .release        = seq_release,
1329         .owner          = THIS_MODULE,
1330 };
1331
1332 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1333 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1334 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1335 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1336 static int nfs_volume_list_show(struct seq_file *m, void *v);
1337
1338 static struct seq_operations nfs_volume_list_ops = {
1339         .start  = nfs_volume_list_start,
1340         .next   = nfs_volume_list_next,
1341         .stop   = nfs_volume_list_stop,
1342         .show   = nfs_volume_list_show,
1343 };
1344
1345 static const struct file_operations nfs_volume_list_fops = {
1346         .open           = nfs_volume_list_open,
1347         .read           = seq_read,
1348         .llseek         = seq_lseek,
1349         .release        = seq_release,
1350         .owner          = THIS_MODULE,
1351 };
1352
1353 /*
1354  * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1355  * we're dealing
1356  */
1357 static int nfs_server_list_open(struct inode *inode, struct file *file)
1358 {
1359         struct seq_file *m;
1360         int ret;
1361
1362         ret = seq_open(file, &nfs_server_list_ops);
1363         if (ret < 0)
1364                 return ret;
1365
1366         m = file->private_data;
1367         m->private = PDE(inode)->data;
1368
1369         return 0;
1370 }
1371
1372 /*
1373  * set up the iterator to start reading from the server list and return the first item
1374  */
1375 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1376 {
1377         /* lock the list against modification */
1378         spin_lock(&nfs_client_lock);
1379         return seq_list_start_head(&nfs_client_list, *_pos);
1380 }
1381
1382 /*
1383  * move to next server
1384  */
1385 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1386 {
1387         return seq_list_next(v, &nfs_client_list, pos);
1388 }
1389
1390 /*
1391  * clean up after reading from the transports list
1392  */
1393 static void nfs_server_list_stop(struct seq_file *p, void *v)
1394 {
1395         spin_unlock(&nfs_client_lock);
1396 }
1397
1398 /*
1399  * display a header line followed by a load of call lines
1400  */
1401 static int nfs_server_list_show(struct seq_file *m, void *v)
1402 {
1403         struct nfs_client *clp;
1404
1405         /* display header on line 1 */
1406         if (v == &nfs_client_list) {
1407                 seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1408                 return 0;
1409         }
1410
1411         /* display one transport per line on subsequent lines */
1412         clp = list_entry(v, struct nfs_client, cl_share_link);
1413
1414         seq_printf(m, "v%u %s %s %3d %s\n",
1415                    clp->rpc_ops->version,
1416                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1417                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1418                    atomic_read(&clp->cl_count),
1419                    clp->cl_hostname);
1420
1421         return 0;
1422 }
1423
1424 /*
1425  * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1426  */
1427 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1428 {
1429         struct seq_file *m;
1430         int ret;
1431
1432         ret = seq_open(file, &nfs_volume_list_ops);
1433         if (ret < 0)
1434                 return ret;
1435
1436         m = file->private_data;
1437         m->private = PDE(inode)->data;
1438
1439         return 0;
1440 }
1441
1442 /*
1443  * set up the iterator to start reading from the volume list and return the first item
1444  */
1445 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1446 {
1447         /* lock the list against modification */
1448         spin_lock(&nfs_client_lock);
1449         return seq_list_start_head(&nfs_volume_list, *_pos);
1450 }
1451
1452 /*
1453  * move to next volume
1454  */
1455 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1456 {
1457         return seq_list_next(v, &nfs_volume_list, pos);
1458 }
1459
1460 /*
1461  * clean up after reading from the transports list
1462  */
1463 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1464 {
1465         spin_unlock(&nfs_client_lock);
1466 }
1467
1468 /*
1469  * display a header line followed by a load of call lines
1470  */
1471 static int nfs_volume_list_show(struct seq_file *m, void *v)
1472 {
1473         struct nfs_server *server;
1474         struct nfs_client *clp;
1475         char dev[8], fsid[17];
1476
1477         /* display header on line 1 */
1478         if (v == &nfs_volume_list) {
1479                 seq_puts(m, "NV SERVER   PORT DEV     FSID\n");
1480                 return 0;
1481         }
1482         /* display one transport per line on subsequent lines */
1483         server = list_entry(v, struct nfs_server, master_link);
1484         clp = server->nfs_client;
1485
1486         snprintf(dev, 8, "%u:%u",
1487                  MAJOR(server->s_dev), MINOR(server->s_dev));
1488
1489         snprintf(fsid, 17, "%llx:%llx",
1490                  (unsigned long long) server->fsid.major,
1491                  (unsigned long long) server->fsid.minor);
1492
1493         seq_printf(m, "v%u %s %s %-7s %-17s\n",
1494                    clp->rpc_ops->version,
1495                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1496                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1497                    dev,
1498                    fsid);
1499
1500         return 0;
1501 }
1502
1503 /*
1504  * initialise the /proc/fs/nfsfs/ directory
1505  */
1506 int __init nfs_fs_proc_init(void)
1507 {
1508         struct proc_dir_entry *p;
1509
1510         proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1511         if (!proc_fs_nfs)
1512                 goto error_0;
1513
1514         proc_fs_nfs->owner = THIS_MODULE;
1515
1516         /* a file of servers with which we're dealing */
1517         p = proc_create("servers", S_IFREG|S_IRUGO,
1518                         proc_fs_nfs, &nfs_server_list_fops);
1519         if (!p)
1520                 goto error_1;
1521
1522         /* a file of volumes that we have mounted */
1523         p = proc_create("volumes", S_IFREG|S_IRUGO,
1524                         proc_fs_nfs, &nfs_volume_list_fops);
1525         if (!p)
1526                 goto error_2;
1527         return 0;
1528
1529 error_2:
1530         remove_proc_entry("servers", proc_fs_nfs);
1531 error_1:
1532         remove_proc_entry("fs/nfsfs", NULL);
1533 error_0:
1534         return -ENOMEM;
1535 }
1536
1537 /*
1538  * clean up the /proc/fs/nfsfs/ directory
1539  */
1540 void nfs_fs_proc_exit(void)
1541 {
1542         remove_proc_entry("volumes", proc_fs_nfs);
1543         remove_proc_entry("servers", proc_fs_nfs);
1544         remove_proc_entry("fs/nfsfs", NULL);
1545 }
1546
1547 #endif /* CONFIG_PROC_FS */