fs/nfsd/nfsctl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Syscall interface to knfsd.
   4  *
   5  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   6  */
   7
   8 #include <linux/slab.h>
   9 #include <linux/namei.h>
  10 #include <linux/ctype.h>
  11
  12 #include <linux/sunrpc/svcsock.h>
  13 #include <linux/lockd/lockd.h>
  14 #include <linux/sunrpc/addr.h>
  15 #include <linux/sunrpc/gss_api.h>
  16 #include <linux/sunrpc/gss_krb5_enctypes.h>
  17 #include <linux/sunrpc/rpc_pipe_fs.h>
  18 #include <linux/module.h>
  19
  20 #include "idmap.h"
  21 #include "nfsd.h"
  22 #include "cache.h"
  23 #include "state.h"
  24 #include "netns.h"
  25 #include "pnfs.h"
  26
  27 /*
  28  *      We have a single directory with several nodes in it.
  29  */
  30 enum {
  31         NFSD_Root = 1,
  32         NFSD_List,
  33         NFSD_Export_features,
  34         NFSD_Fh,
  35         NFSD_FO_UnlockIP,
  36         NFSD_FO_UnlockFS,
  37         NFSD_Threads,
  38         NFSD_Pool_Threads,
  39         NFSD_Pool_Stats,
  40         NFSD_Reply_Cache_Stats,
  41         NFSD_Versions,
  42         NFSD_Ports,
  43         NFSD_MaxBlkSize,
  44         NFSD_MaxConnections,
  45         NFSD_SupportedEnctypes,
  46         /*
  47          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  48          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  49          */
  50 #ifdef CONFIG_NFSD_V4
  51         NFSD_Leasetime,
  52         NFSD_Gracetime,
  53         NFSD_RecoveryDir,
  54         NFSD_V4EndGrace,
  55 #endif
  56 };
  57
  58 /*
  59  * write() for these nodes.
  60  */
  61 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  62 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  63 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  64 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  65 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  66 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  67 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  68 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  69 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
  70 #ifdef CONFIG_NFSD_V4
  71 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  72 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  73 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  74 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
  75 #endif
  76
  77 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
  78         [NFSD_Fh] = write_filehandle,
  79         [NFSD_FO_UnlockIP] = write_unlock_ip,
  80         [NFSD_FO_UnlockFS] = write_unlock_fs,
  81         [NFSD_Threads] = write_threads,
  82         [NFSD_Pool_Threads] = write_pool_threads,
  83         [NFSD_Versions] = write_versions,
  84         [NFSD_Ports] = write_ports,
  85         [NFSD_MaxBlkSize] = write_maxblksize,
  86         [NFSD_MaxConnections] = write_maxconn,
  87 #ifdef CONFIG_NFSD_V4
  88         [NFSD_Leasetime] = write_leasetime,
  89         [NFSD_Gracetime] = write_gracetime,
  90         [NFSD_RecoveryDir] = write_recoverydir,
  91         [NFSD_V4EndGrace] = write_v4_end_grace,
  92 #endif
  93 };
  94
  95 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  96 {
  97         ino_t ino =  file_inode(file)->i_ino;
  98         char *data;
  99         ssize_t rv;
 100
 101         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 102                 return -EINVAL;
 103
 104         data = simple_transaction_get(file, buf, size);
 105         if (IS_ERR(data))
 106                 return PTR_ERR(data);
 107
 108         rv =  write_op[ino](file, data, size);
 109         if (rv >= 0) {
 110                 simple_transaction_set(file, rv);
 111                 rv = size;
 112         }
 113         return rv;
 114 }
 115
 116 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 117 {
 118         if (! file->private_data) {
 119                 /* An attempt to read a transaction file without writing
 120                  * causes a 0-byte write so that the file can return
 121                  * state information
 122                  */
 123                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 124                 if (rv < 0)
 125                         return rv;
 126         }
 127         return simple_transaction_read(file, buf, size, pos);
 128 }
 129
 130 static const struct file_operations transaction_ops = {
 131         .write          = nfsctl_transaction_write,
 132         .read           = nfsctl_transaction_read,
 133         .release        = simple_transaction_release,
 134         .llseek         = default_llseek,
 135 };
 136
 137 static int exports_net_open(struct net *net, struct file *file)
 138 {
 139         int err;
 140         struct seq_file *seq;
 141         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 142
 143         err = seq_open(file, &nfs_exports_op);
 144         if (err)
 145                 return err;
 146
 147         seq = file->private_data;
 148         seq->private = nn->svc_export_cache;
 149         return 0;
 150 }
 151
 152 static int exports_proc_open(struct inode *inode, struct file *file)
 153 {
 154         return exports_net_open(current->nsproxy->net_ns, file);
 155 }
 156
 157 static const struct file_operations exports_proc_operations = {
 158         .open           = exports_proc_open,
 159         .read           = seq_read,
 160         .llseek         = seq_lseek,
 161         .release        = seq_release,
 162 };
 163
 164 static int exports_nfsd_open(struct inode *inode, struct file *file)
 165 {
 166         return exports_net_open(inode->i_sb->s_fs_info, file);
 167 }
 168
 169 static const struct file_operations exports_nfsd_operations = {
 170         .open           = exports_nfsd_open,
 171         .read           = seq_read,
 172         .llseek         = seq_lseek,
 173         .release        = seq_release,
 174 };
 175
 176 static int export_features_show(struct seq_file *m, void *v)
 177 {
 178         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 179         return 0;
 180 }
 181
 182 static int export_features_open(struct inode *inode, struct file *file)
 183 {
 184         return single_open(file, export_features_show, NULL);
 185 }
 186
 187 static const struct file_operations export_features_operations = {
 188         .open           = export_features_open,
 189         .read           = seq_read,
 190         .llseek         = seq_lseek,
 191         .release        = single_release,
 192 };
 193
 194 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 195 static int supported_enctypes_show(struct seq_file *m, void *v)
 196 {
 197         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 198         return 0;
 199 }
 200
 201 static int supported_enctypes_open(struct inode *inode, struct file *file)
 202 {
 203         return single_open(file, supported_enctypes_show, NULL);
 204 }
 205
 206 static const struct file_operations supported_enctypes_ops = {
 207         .open           = supported_enctypes_open,
 208         .read           = seq_read,
 209         .llseek         = seq_lseek,
 210         .release        = single_release,
 211 };
 212 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 213
 214 static const struct file_operations pool_stats_operations = {
 215         .open           = nfsd_pool_stats_open,
 216         .read           = seq_read,
 217         .llseek         = seq_lseek,
 218         .release        = nfsd_pool_stats_release,
 219 };
 220
 221 static const struct file_operations reply_cache_stats_operations = {
 222         .open           = nfsd_reply_cache_stats_open,
 223         .read           = seq_read,
 224         .llseek         = seq_lseek,
 225         .release        = single_release,
 226 };
 227
 228 /*----------------------------------------------------------------------------*/
 229 /*
 230  * payload - write methods
 231  */
 232
 233 static inline struct net *netns(struct file *file)
 234 {
 235         return file_inode(file)->i_sb->s_fs_info;
 236 }
 237
 238 /**
 239  * write_unlock_ip - Release all locks used by a client
 240  *
 241  * Experimental.
 242  *
 243  * Input:
 244  *                      buf:    '\n'-terminated C string containing a
 245  *                              presentation format IP address
 246  *                      size:   length of C string in @buf
 247  * Output:
 248  *      On success:     returns zero if all specified locks were released;
 249  *                      returns one if one or more locks were not released
 250  *      On error:       return code is negative errno value
 251  */
 252 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 253 {
 254         struct sockaddr_storage address;
 255         struct sockaddr *sap = (struct sockaddr *)&address;
 256         size_t salen = sizeof(address);
 257         char *fo_path;
 258         struct net *net = netns(file);
 259
 260         /* sanity check */
 261         if (size == 0)
 262                 return -EINVAL;
 263
 264         if (buf[size-1] != '\n')
 265                 return -EINVAL;
 266
 267         fo_path = buf;
 268         if (qword_get(&buf, fo_path, size) < 0)
 269                 return -EINVAL;
 270
 271         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
 272                 return -EINVAL;
 273
 274         return nlmsvc_unlock_all_by_ip(sap);
 275 }
 276
 277 /**
 278  * write_unlock_fs - Release all locks on a local file system
 279  *
 280  * Experimental.
 281  *
 282  * Input:
 283  *                      buf:    '\n'-terminated C string containing the
 284  *                              absolute pathname of a local file system
 285  *                      size:   length of C string in @buf
 286  * Output:
 287  *      On success:     returns zero if all specified locks were released;
 288  *                      returns one if one or more locks were not released
 289  *      On error:       return code is negative errno value
 290  */
 291 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 292 {
 293         struct path path;
 294         char *fo_path;
 295         int error;
 296
 297         /* sanity check */
 298         if (size == 0)
 299                 return -EINVAL;
 300
 301         if (buf[size-1] != '\n')
 302                 return -EINVAL;
 303
 304         fo_path = buf;
 305         if (qword_get(&buf, fo_path, size) < 0)
 306                 return -EINVAL;
 307
 308         error = kern_path(fo_path, 0, &path);
 309         if (error)
 310                 return error;
 311
 312         /*
 313          * XXX: Needs better sanity checking.  Otherwise we could end up
 314          * releasing locks on the wrong file system.
 315          *
 316          * For example:
 317          * 1.  Does the path refer to a directory?
 318          * 2.  Is that directory a mount point, or
 319          * 3.  Is that directory the root of an exported file system?
 320          */
 321         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 322
 323         path_put(&path);
 324         return error;
 325 }
 326
 327 /**
 328  * write_filehandle - Get a variable-length NFS file handle by path
 329  *
 330  * On input, the buffer contains a '\n'-terminated C string comprised of
 331  * three alphanumeric words separated by whitespace.  The string may
 332  * contain escape sequences.
 333  *
 334  * Input:
 335  *                      buf:
 336  *                              domain:         client domain name
 337  *                              path:           export pathname
 338  *                              maxsize:        numeric maximum size of
 339  *                                              @buf
 340  *                      size:   length of C string in @buf
 341  * Output:
 342  *      On success:     passed-in buffer filled with '\n'-terminated C
 343  *                      string containing a ASCII hex text version
 344  *                      of the NFS file handle;
 345  *                      return code is the size in bytes of the string
 346  *      On error:       return code is negative errno value
 347  */
 348 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 349 {
 350         char *dname, *path;
 351         int uninitialized_var(maxsize);
 352         char *mesg = buf;
 353         int len;
 354         struct auth_domain *dom;
 355         struct knfsd_fh fh;
 356
 357         if (size == 0)
 358                 return -EINVAL;
 359
 360         if (buf[size-1] != '\n')
 361                 return -EINVAL;
 362         buf[size-1] = 0;
 363
 364         dname = mesg;
 365         len = qword_get(&mesg, dname, size);
 366         if (len <= 0)
 367                 return -EINVAL;
 368
 369         path = dname+len+1;
 370         len = qword_get(&mesg, path, size);
 371         if (len <= 0)
 372                 return -EINVAL;
 373
 374         len = get_int(&mesg, &maxsize);
 375         if (len)
 376                 return len;
 377
 378         if (maxsize < NFS_FHSIZE)
 379                 return -EINVAL;
 380         maxsize = min(maxsize, NFS3_FHSIZE);
 381
 382         if (qword_get(&mesg, mesg, size)>0)
 383                 return -EINVAL;
 384
 385         /* we have all the words, they are in buf.. */
 386         dom = unix_domain_find(dname);
 387         if (!dom)
 388                 return -ENOMEM;
 389
 390         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
 391         auth_domain_put(dom);
 392         if (len)
 393                 return len;
 394
 395         mesg = buf;
 396         len = SIMPLE_TRANSACTION_LIMIT;
 397         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 398         mesg[-1] = '\n';
 399         return mesg - buf;
 400 }
 401
 402 /**
 403  * write_threads - Start NFSD, or report the current number of running threads
 404  *
 405  * Input:
 406  *                      buf:            ignored
 407  *                      size:           zero
 408  * Output:
 409  *      On success:     passed-in buffer filled with '\n'-terminated C
 410  *                      string numeric value representing the number of
 411  *                      running NFSD threads;
 412  *                      return code is the size in bytes of the string
 413  *      On error:       return code is zero
 414  *
 415  * OR
 416  *
 417  * Input:
 418  *                      buf:            C string containing an unsigned
 419  *                                      integer value representing the
 420  *                                      number of NFSD threads to start
 421  *                      size:           non-zero length of C string in @buf
 422  * Output:
 423  *      On success:     NFS service is started;
 424  *                      passed-in buffer filled with '\n'-terminated C
 425  *                      string numeric value representing the number of
 426  *                      running NFSD threads;
 427  *                      return code is the size in bytes of the string
 428  *      On error:       return code is zero or a negative errno value
 429  */
 430 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 431 {
 432         char *mesg = buf;
 433         int rv;
 434         struct net *net = netns(file);
 435
 436         if (size > 0) {
 437                 int newthreads;
 438                 rv = get_int(&mesg, &newthreads);
 439                 if (rv)
 440                         return rv;
 441                 if (newthreads < 0)
 442                         return -EINVAL;
 443                 rv = nfsd_svc(newthreads, net, file->f_cred);
 444                 if (rv < 0)
 445                         return rv;
 446         } else
 447                 rv = nfsd_nrthreads(net);
 448
 449         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 450 }
 451
 452 /**
 453  * write_pool_threads - Set or report the current number of threads per pool
 454  *
 455  * Input:
 456  *                      buf:            ignored
 457  *                      size:           zero
 458  *
 459  * OR
 460  *
 461  * Input:
 462  *                      buf:            C string containing whitespace-
 463  *                                      separated unsigned integer values
 464  *                                      representing the number of NFSD
 465  *                                      threads to start in each pool
 466  *                      size:           non-zero length of C string in @buf
 467  * Output:
 468  *      On success:     passed-in buffer filled with '\n'-terminated C
 469  *                      string containing integer values representing the
 470  *                      number of NFSD threads in each pool;
 471  *                      return code is the size in bytes of the string
 472  *      On error:       return code is zero or a negative errno value
 473  */
 474 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 475 {
 476         /* if size > 0, look for an array of number of threads per node
 477          * and apply them  then write out number of threads per node as reply
 478          */
 479         char *mesg = buf;
 480         int i;
 481         int rv;
 482         int len;
 483         int npools;
 484         int *nthreads;
 485         struct net *net = netns(file);
 486
 487         mutex_lock(&nfsd_mutex);
 488         npools = nfsd_nrpools(net);
 489         if (npools == 0) {
 490                 /*
 491                  * NFS is shut down.  The admin can start it by
 492                  * writing to the threads file but NOT the pool_threads
 493                  * file, sorry.  Report zero threads.
 494                  */
 495                 mutex_unlock(&nfsd_mutex);
 496                 strcpy(buf, "0\n");
 497                 return strlen(buf);
 498         }
 499
 500         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 501         rv = -ENOMEM;
 502         if (nthreads == NULL)
 503                 goto out_free;
 504
 505         if (size > 0) {
 506                 for (i = 0; i < npools; i++) {
 507                         rv = get_int(&mesg, &nthreads[i]);
 508                         if (rv == -ENOENT)
 509                                 break;          /* fewer numbers than pools */
 510                         if (rv)
 511                                 goto out_free;  /* syntax error */
 512                         rv = -EINVAL;
 513                         if (nthreads[i] < 0)
 514                                 goto out_free;
 515                 }
 516                 rv = nfsd_set_nrthreads(i, nthreads, net);
 517                 if (rv)
 518                         goto out_free;
 519         }
 520
 521         rv = nfsd_get_nrthreads(npools, nthreads, net);
 522         if (rv)
 523                 goto out_free;
 524
 525         mesg = buf;
 526         size = SIMPLE_TRANSACTION_LIMIT;
 527         for (i = 0; i < npools && size > 0; i++) {
 528                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 529                 len = strlen(mesg);
 530                 size -= len;
 531                 mesg += len;
 532         }
 533         rv = mesg - buf;
 534 out_free:
 535         kfree(nthreads);
 536         mutex_unlock(&nfsd_mutex);
 537         return rv;
 538 }
 539
 540 static ssize_t
 541 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
 542                 const char *sep, unsigned vers, int minor)
 543 {
 544         const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
 545         bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
 546
 547         if (vers == 4 && minor >= 0 &&
 548             !nfsd_minorversion(nn, minor, NFSD_TEST))
 549                 supported = false;
 550         if (minor == 0 && supported)
 551                 /*
 552                  * special case for backward compatability.
 553                  * +4.0 is never reported, it is implied by
 554                  * +4, unless -4.0 is present.
 555                  */
 556                 return 0;
 557         return snprintf(buf, remaining, format, sep,
 558                         supported ? '+' : '-', vers, minor);
 559 }
 560
 561 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 562 {
 563         char *mesg = buf;
 564         char *vers, *minorp, sign;
 565         int len, num, remaining;
 566         ssize_t tlen = 0;
 567         char *sep;
 568         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 569
 570         if (size>0) {
 571                 if (nn->nfsd_serv)
 572                         /* Cannot change versions without updating
 573                          * nn->nfsd_serv->sv_xdrsize, and reallocing
 574                          * rq_argp and rq_resp
 575                          */
 576                         return -EBUSY;
 577                 if (buf[size-1] != '\n')
 578                         return -EINVAL;
 579                 buf[size-1] = 0;
 580
 581                 vers = mesg;
 582                 len = qword_get(&mesg, vers, size);
 583                 if (len <= 0) return -EINVAL;
 584                 do {
 585                         enum vers_op cmd;
 586                         unsigned minor;
 587                         sign = *vers;
 588                         if (sign == '+' || sign == '-')
 589                                 num = simple_strtol((vers+1), &minorp, 0);
 590                         else
 591                                 num = simple_strtol(vers, &minorp, 0);
 592                         if (*minorp == '.') {
 593                                 if (num != 4)
 594                                         return -EINVAL;
 595                                 if (kstrtouint(minorp+1, 0, &minor) < 0)
 596                                         return -EINVAL;
 597                         }
 598
 599                         cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
 600                         switch(num) {
 601                         case 2:
 602                         case 3:
 603                                 nfsd_vers(nn, num, cmd);
 604                                 break;
 605                         case 4:
 606                                 if (*minorp == '.') {
 607                                         if (nfsd_minorversion(nn, minor, cmd) < 0)
 608                                                 return -EINVAL;
 609                                 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
 610                                         /*
 611                                          * Either we have +4 and no minors are enabled,
 612                                          * or we have -4 and at least one minor is enabled.
 613                                          * In either case, propagate 'cmd' to all minors.
 614                                          */
 615                                         minor = 0;
 616                                         while (nfsd_minorversion(nn, minor, cmd) >= 0)
 617                                                 minor++;
 618                                 }
 619                                 break;
 620                         default:
 621                                 return -EINVAL;
 622                         }
 623                         vers += len + 1;
 624                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 625                 /* If all get turned off, turn them back on, as
 626                  * having no versions is BAD
 627                  */
 628                 nfsd_reset_versions(nn);
 629         }
 630
 631         /* Now write current state into reply buffer */
 632         len = 0;
 633         sep = "";
 634         remaining = SIMPLE_TRANSACTION_LIMIT;
 635         for (num=2 ; num <= 4 ; num++) {
 636                 int minor;
 637                 if (!nfsd_vers(nn, num, NFSD_AVAIL))
 638                         continue;
 639
 640                 minor = -1;
 641                 do {
 642                         len = nfsd_print_version_support(nn, buf, remaining,
 643                                         sep, num, minor);
 644                         if (len >= remaining)
 645                                 goto out;
 646                         remaining -= len;
 647                         buf += len;
 648                         tlen += len;
 649                         minor++;
 650                         if (len)
 651                                 sep = " ";
 652                 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
 653         }
 654 out:
 655         len = snprintf(buf, remaining, "\n");
 656         if (len >= remaining)
 657                 return -EINVAL;
 658         return tlen + len;
 659 }
 660
 661 /**
 662  * write_versions - Set or report the available NFS protocol versions
 663  *
 664  * Input:
 665  *                      buf:            ignored
 666  *                      size:           zero
 667  * Output:
 668  *      On success:     passed-in buffer filled with '\n'-terminated C
 669  *                      string containing positive or negative integer
 670  *                      values representing the current status of each
 671  *                      protocol version;
 672  *                      return code is the size in bytes of the string
 673  *      On error:       return code is zero or a negative errno value
 674  *
 675  * OR
 676  *
 677  * Input:
 678  *                      buf:            C string containing whitespace-
 679  *                                      separated positive or negative
 680  *                                      integer values representing NFS
 681  *                                      protocol versions to enable ("+n")
 682  *                                      or disable ("-n")
 683  *                      size:           non-zero length of C string in @buf
 684  * Output:
 685  *      On success:     status of zero or more protocol versions has
 686  *                      been updated; passed-in buffer filled with
 687  *                      '\n'-terminated C string containing positive
 688  *                      or negative integer values representing the
 689  *                      current status of each protocol version;
 690  *                      return code is the size in bytes of the string
 691  *      On error:       return code is zero or a negative errno value
 692  */
 693 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 694 {
 695         ssize_t rv;
 696
 697         mutex_lock(&nfsd_mutex);
 698         rv = __write_versions(file, buf, size);
 699         mutex_unlock(&nfsd_mutex);
 700         return rv;
 701 }
 702
 703 /*
 704  * Zero-length write.  Return a list of NFSD's current listener
 705  * transports.
 706  */
 707 static ssize_t __write_ports_names(char *buf, struct net *net)
 708 {
 709         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 710
 711         if (nn->nfsd_serv == NULL)
 712                 return 0;
 713         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 714 }
 715
 716 /*
 717  * A single 'fd' number was written, in which case it must be for
 718  * a socket of a supported family/protocol, and we use it as an
 719  * nfsd listener.
 720  */
 721 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
 722 {
 723         char *mesg = buf;
 724         int fd, err;
 725         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 726
 727         err = get_int(&mesg, &fd);
 728         if (err != 0 || fd < 0)
 729                 return -EINVAL;
 730
 731         if (svc_alien_sock(net, fd)) {
 732                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
 733                 return -EINVAL;
 734         }
 735
 736         err = nfsd_create_serv(net);
 737         if (err != 0)
 738                 return err;
 739
 740         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
 741         if (err < 0) {
 742                 nfsd_destroy(net);
 743                 return err;
 744         }
 745
 746         /* Decrease the count, but don't shut down the service */
 747         nn->nfsd_serv->sv_nrthreads--;
 748         return err;
 749 }
 750
 751 /*
 752  * A transport listener is added by writing it's transport name and
 753  * a port number.
 754  */
 755 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
 756 {
 757         char transport[16];
 758         struct svc_xprt *xprt;
 759         int port, err;
 760         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 761
 762         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
 763                 return -EINVAL;
 764
 765         if (port < 1 || port > USHRT_MAX)
 766                 return -EINVAL;
 767
 768         err = nfsd_create_serv(net);
 769         if (err != 0)
 770                 return err;
 771
 772         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 773                                 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
 774         if (err < 0)
 775                 goto out_err;
 776
 777         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 778                                 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
 779         if (err < 0 && err != -EAFNOSUPPORT)
 780                 goto out_close;
 781
 782         /* Decrease the count, but don't shut down the service */
 783         nn->nfsd_serv->sv_nrthreads--;
 784         return 0;
 785 out_close:
 786         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
 787         if (xprt != NULL) {
 788                 svc_close_xprt(xprt);
 789                 svc_xprt_put(xprt);
 790         }
 791 out_err:
 792         nfsd_destroy(net);
 793         return err;
 794 }
 795
 796 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
 797                              struct net *net)
 798 {
 799         if (size == 0)
 800                 return __write_ports_names(buf, net);
 801
 802         if (isdigit(buf[0]))
 803                 return __write_ports_addfd(buf, net, file->f_cred);
 804
 805         if (isalpha(buf[0]))
 806                 return __write_ports_addxprt(buf, net, file->f_cred);
 807
 808         return -EINVAL;
 809 }
 810
 811 /**
 812  * write_ports - Pass a socket file descriptor or transport name to listen on
 813  *
 814  * Input:
 815  *                      buf:            ignored
 816  *                      size:           zero
 817  * Output:
 818  *      On success:     passed-in buffer filled with a '\n'-terminated C
 819  *                      string containing a whitespace-separated list of
 820  *                      named NFSD listeners;
 821  *                      return code is the size in bytes of the string
 822  *      On error:       return code is zero or a negative errno value
 823  *
 824  * OR
 825  *
 826  * Input:
 827  *                      buf:            C string containing an unsigned
 828  *                                      integer value representing a bound
 829  *                                      but unconnected socket that is to be
 830  *                                      used as an NFSD listener; listen(3)
 831  *                                      must be called for a SOCK_STREAM
 832  *                                      socket, otherwise it is ignored
 833  *                      size:           non-zero length of C string in @buf
 834  * Output:
 835  *      On success:     NFS service is started;
 836  *                      passed-in buffer filled with a '\n'-terminated C
 837  *                      string containing a unique alphanumeric name of
 838  *                      the listener;
 839  *                      return code is the size in bytes of the string
 840  *      On error:       return code is a negative errno value
 841  *
 842  * OR
 843  *
 844  * Input:
 845  *                      buf:            C string containing a transport
 846  *                                      name and an unsigned integer value
 847  *                                      representing the port to listen on,
 848  *                                      separated by whitespace
 849  *                      size:           non-zero length of C string in @buf
 850  * Output:
 851  *      On success:     returns zero; NFS service is started
 852  *      On error:       return code is a negative errno value
 853  */
 854 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 855 {
 856         ssize_t rv;
 857
 858         mutex_lock(&nfsd_mutex);
 859         rv = __write_ports(file, buf, size, netns(file));
 860         mutex_unlock(&nfsd_mutex);
 861         return rv;
 862 }
 863
 864
 865 int nfsd_max_blksize;
 866
 867 /**
 868  * write_maxblksize - Set or report the current NFS blksize
 869  *
 870  * Input:
 871  *                      buf:            ignored
 872  *                      size:           zero
 873  *
 874  * OR
 875  *
 876  * Input:
 877  *                      buf:            C string containing an unsigned
 878  *                                      integer value representing the new
 879  *                                      NFS blksize
 880  *                      size:           non-zero length of C string in @buf
 881  * Output:
 882  *      On success:     passed-in buffer filled with '\n'-terminated C string
 883  *                      containing numeric value of the current NFS blksize
 884  *                      setting;
 885  *                      return code is the size in bytes of the string
 886  *      On error:       return code is zero or a negative errno value
 887  */
 888 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 889 {
 890         char *mesg = buf;
 891         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 892
 893         if (size > 0) {
 894                 int bsize;
 895                 int rv = get_int(&mesg, &bsize);
 896                 if (rv)
 897                         return rv;
 898                 /* force bsize into allowed range and
 899                  * required alignment.
 900                  */
 901                 bsize = max_t(int, bsize, 1024);
 902                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
 903                 bsize &= ~(1024-1);
 904                 mutex_lock(&nfsd_mutex);
 905                 if (nn->nfsd_serv) {
 906                         mutex_unlock(&nfsd_mutex);
 907                         return -EBUSY;
 908                 }
 909                 nfsd_max_blksize = bsize;
 910                 mutex_unlock(&nfsd_mutex);
 911         }
 912
 913         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 914                                                         nfsd_max_blksize);
 915 }
 916
 917 /**
 918  * write_maxconn - Set or report the current max number of connections
 919  *
 920  * Input:
 921  *                      buf:            ignored
 922  *                      size:           zero
 923  * OR
 924  *
 925  * Input:
 926  *                      buf:            C string containing an unsigned
 927  *                                      integer value representing the new
 928  *                                      number of max connections
 929  *                      size:           non-zero length of C string in @buf
 930  * Output:
 931  *      On success:     passed-in buffer filled with '\n'-terminated C string
 932  *                      containing numeric value of max_connections setting
 933  *                      for this net namespace;
 934  *                      return code is the size in bytes of the string
 935  *      On error:       return code is zero or a negative errno value
 936  */
 937 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
 938 {
 939         char *mesg = buf;
 940         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 941         unsigned int maxconn = nn->max_connections;
 942
 943         if (size > 0) {
 944                 int rv = get_uint(&mesg, &maxconn);
 945
 946                 if (rv)
 947                         return rv;
 948                 nn->max_connections = maxconn;
 949         }
 950
 951         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
 952 }
 953
 954 #ifdef CONFIG_NFSD_V4
 955 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
 956                                   time_t *time, struct nfsd_net *nn)
 957 {
 958         char *mesg = buf;
 959         int rv, i;
 960
 961         if (size > 0) {
 962                 if (nn->nfsd_serv)
 963                         return -EBUSY;
 964                 rv = get_int(&mesg, &i);
 965                 if (rv)
 966                         return rv;
 967                 /*
 968                  * Some sanity checking.  We don't have a reason for
 969                  * these particular numbers, but problems with the
 970                  * extremes are:
 971                  *      - Too short: the briefest network outage may
 972                  *        cause clients to lose all their locks.  Also,
 973                  *        the frequent polling may be wasteful.
 974                  *      - Too long: do you really want reboot recovery
 975                  *        to take more than an hour?  Or to make other
 976                  *        clients wait an hour before being able to
 977                  *        revoke a dead client's locks?
 978                  */
 979                 if (i < 10 || i > 3600)
 980                         return -EINVAL;
 981                 *time = i;
 982         }
 983
 984         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 985 }
 986
 987 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
 988                                 time_t *time, struct nfsd_net *nn)
 989 {
 990         ssize_t rv;
 991
 992         mutex_lock(&nfsd_mutex);
 993         rv = __nfsd4_write_time(file, buf, size, time, nn);
 994         mutex_unlock(&nfsd_mutex);
 995         return rv;
 996 }
 997
 998 /**
 999  * write_leasetime - Set or report the current NFSv4 lease time
1000  *
1001  * Input:
1002  *                      buf:            ignored
1003  *                      size:           zero
1004  *
1005  * OR
1006  *
1007  * Input:
1008  *                      buf:            C string containing an unsigned
1009  *                                      integer value representing the new
1010  *                                      NFSv4 lease expiry time
1011  *                      size:           non-zero length of C string in @buf
1012  * Output:
1013  *      On success:     passed-in buffer filled with '\n'-terminated C
1014  *                      string containing unsigned integer value of the
1015  *                      current lease expiry time;
1016  *                      return code is the size in bytes of the string
1017  *      On error:       return code is zero or a negative errno value
1018  */
1019 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1020 {
1021         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1022         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1023 }
1024
1025 /**
1026  * write_gracetime - Set or report current NFSv4 grace period time
1027  *
1028  * As above, but sets the time of the NFSv4 grace period.
1029  *
1030  * Note this should never be set to less than the *previous*
1031  * lease-period time, but we don't try to enforce this.  (In the common
1032  * case (a new boot), we don't know what the previous lease time was
1033  * anyway.)
1034  */
1035 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1036 {
1037         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1038         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1039 }
1040
1041 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1042                                    struct nfsd_net *nn)
1043 {
1044         char *mesg = buf;
1045         char *recdir;
1046         int len, status;
1047
1048         if (size > 0) {
1049                 if (nn->nfsd_serv)
1050                         return -EBUSY;
1051                 if (size > PATH_MAX || buf[size-1] != '\n')
1052                         return -EINVAL;
1053                 buf[size-1] = 0;
1054
1055                 recdir = mesg;
1056                 len = qword_get(&mesg, recdir, size);
1057                 if (len <= 0)
1058                         return -EINVAL;
1059
1060                 status = nfs4_reset_recoverydir(recdir);
1061                 if (status)
1062                         return status;
1063         }
1064
1065         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1066                                                         nfs4_recoverydir());
1067 }
1068
1069 /**
1070  * write_recoverydir - Set or report the pathname of the recovery directory
1071  *
1072  * Input:
1073  *                      buf:            ignored
1074  *                      size:           zero
1075  *
1076  * OR
1077  *
1078  * Input:
1079  *                      buf:            C string containing the pathname
1080  *                                      of the directory on a local file
1081  *                                      system containing permanent NFSv4
1082  *                                      recovery data
1083  *                      size:           non-zero length of C string in @buf
1084  * Output:
1085  *      On success:     passed-in buffer filled with '\n'-terminated C string
1086  *                      containing the current recovery pathname setting;
1087  *                      return code is the size in bytes of the string
1088  *      On error:       return code is zero or a negative errno value
1089  */
1090 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1091 {
1092         ssize_t rv;
1093         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1094
1095         mutex_lock(&nfsd_mutex);
1096         rv = __write_recoverydir(file, buf, size, nn);
1097         mutex_unlock(&nfsd_mutex);
1098         return rv;
1099 }
1100
1101 /**
1102  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1103  *
1104  * Input:
1105  *                      buf:            ignored
1106  *                      size:           zero
1107  * OR
1108  *
1109  * Input:
1110  *                      buf:            any value
1111  *                      size:           non-zero length of C string in @buf
1112  * Output:
1113  *                      passed-in buffer filled with "Y" or "N" with a newline
1114  *                      and NULL-terminated C string. This indicates whether
1115  *                      the grace period has ended in the current net
1116  *                      namespace. Return code is the size in bytes of the
1117  *                      string. Writing a string that starts with 'Y', 'y', or
1118  *                      '1' to the file will end the grace period for nfsd's v4
1119  *                      lock manager.
1120  */
1121 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1122 {
1123         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1124
1125         if (size > 0) {
1126                 switch(buf[0]) {
1127                 case 'Y':
1128                 case 'y':
1129                 case '1':
1130                         if (!nn->nfsd_serv)
1131                                 return -EBUSY;
1132                         nfsd4_end_grace(nn);
1133                         break;
1134                 default:
1135                         return -EINVAL;
1136                 }
1137         }
1138
1139         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1140                          nn->grace_ended ? 'Y' : 'N');
1141 }
1142
1143 #endif
1144
1145 /*----------------------------------------------------------------------------*/
1146 /*
1147  *      populating the filesystem.
1148  */
1149
1150 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1151 {
1152         static const struct tree_descr nfsd_files[] = {
1153                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1154                 [NFSD_Export_features] = {"export_features",
1155                                         &export_features_operations, S_IRUGO},
1156                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1157                                         &transaction_ops, S_IWUSR|S_IRUSR},
1158                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1159                                         &transaction_ops, S_IWUSR|S_IRUSR},
1160                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1161                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1162                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1163                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1164                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1165                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1166                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1167                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1168                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1169 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1170                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1171 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1172 #ifdef CONFIG_NFSD_V4
1173                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1174                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1175                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1176                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1177 #endif
1178                 /* last one */ {""}
1179         };
1180         get_net(sb->s_fs_info);
1181         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1182 }
1183
1184 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1185         int flags, const char *dev_name, void *data)
1186 {
1187         struct net *net = current->nsproxy->net_ns;
1188         return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1189 }
1190
1191 static void nfsd_umount(struct super_block *sb)
1192 {
1193         struct net *net = sb->s_fs_info;
1194
1195         kill_litter_super(sb);
1196         put_net(net);
1197 }
1198
1199 static struct file_system_type nfsd_fs_type = {
1200         .owner          = THIS_MODULE,
1201         .name           = "nfsd",
1202         .mount          = nfsd_mount,
1203         .kill_sb        = nfsd_umount,
1204 };
1205 MODULE_ALIAS_FS("nfsd");
1206
1207 #ifdef CONFIG_PROC_FS
1208 static int create_proc_exports_entry(void)
1209 {
1210         struct proc_dir_entry *entry;
1211
1212         entry = proc_mkdir("fs/nfs", NULL);
1213         if (!entry)
1214                 return -ENOMEM;
1215         entry = proc_create("exports", 0, entry,
1216                                  &exports_proc_operations);
1217         if (!entry) {
1218                 remove_proc_entry("fs/nfs", NULL);
1219                 return -ENOMEM;
1220         }
1221         return 0;
1222 }
1223 #else /* CONFIG_PROC_FS */
1224 static int create_proc_exports_entry(void)
1225 {
1226         return 0;
1227 }
1228 #endif
1229
1230 unsigned int nfsd_net_id;
1231
1232 static __net_init int nfsd_init_net(struct net *net)
1233 {
1234         int retval;
1235         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1236
1237         retval = nfsd_export_init(net);
1238         if (retval)
1239                 goto out_export_error;
1240         retval = nfsd_idmap_init(net);
1241         if (retval)
1242                 goto out_idmap_error;
1243         nn->nfsd_versions = NULL;
1244         nn->nfsd4_minorversions = NULL;
1245         nn->nfsd4_lease = 90;   /* default lease time */
1246         nn->nfsd4_grace = 90;
1247         nn->somebody_reclaimed = false;
1248         nn->track_reclaim_completes = false;
1249         nn->clverifier_counter = prandom_u32();
1250         nn->clientid_counter = prandom_u32();
1251         nn->s2s_cp_cl_id = nn->clientid_counter++;
1252
1253         atomic_set(&nn->ntf_refcnt, 0);
1254         init_waitqueue_head(&nn->ntf_wq);
1255         return 0;
1256
1257 out_idmap_error:
1258         nfsd_export_shutdown(net);
1259 out_export_error:
1260         return retval;
1261 }
1262
1263 static __net_exit void nfsd_exit_net(struct net *net)
1264 {
1265         nfsd_idmap_shutdown(net);
1266         nfsd_export_shutdown(net);
1267         nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1268 }
1269
1270 static struct pernet_operations nfsd_net_ops = {
1271         .init = nfsd_init_net,
1272         .exit = nfsd_exit_net,
1273         .id   = &nfsd_net_id,
1274         .size = sizeof(struct nfsd_net),
1275 };
1276
1277 static int __init init_nfsd(void)
1278 {
1279         int retval;
1280         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1281
1282         retval = register_pernet_subsys(&nfsd_net_ops);
1283         if (retval < 0)
1284                 return retval;
1285         retval = register_cld_notifier();
1286         if (retval)
1287                 goto out_unregister_pernet;
1288         retval = nfsd4_init_slabs();
1289         if (retval)
1290                 goto out_unregister_notifier;
1291         retval = nfsd4_init_pnfs();
1292         if (retval)
1293                 goto out_free_slabs;
1294         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1295         if (retval)
1296                 goto out_exit_pnfs;
1297         nfsd_stat_init();       /* Statistics */
1298         retval = nfsd_reply_cache_init();
1299         if (retval)
1300                 goto out_free_stat;
1301         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1302         retval = create_proc_exports_entry();
1303         if (retval)
1304                 goto out_free_lockd;
1305         retval = register_filesystem(&nfsd_fs_type);
1306         if (retval)
1307                 goto out_free_all;
1308         return 0;
1309 out_free_all:
1310         remove_proc_entry("fs/nfs/exports", NULL);
1311         remove_proc_entry("fs/nfs", NULL);
1312 out_free_lockd:
1313         nfsd_lockd_shutdown();
1314         nfsd_reply_cache_shutdown();
1315 out_free_stat:
1316         nfsd_stat_shutdown();
1317         nfsd_fault_inject_cleanup();
1318 out_exit_pnfs:
1319         nfsd4_exit_pnfs();
1320 out_free_slabs:
1321         nfsd4_free_slabs();
1322 out_unregister_notifier:
1323         unregister_cld_notifier();
1324 out_unregister_pernet:
1325         unregister_pernet_subsys(&nfsd_net_ops);
1326         return retval;
1327 }
1328
1329 static void __exit exit_nfsd(void)
1330 {
1331         nfsd_reply_cache_shutdown();
1332         remove_proc_entry("fs/nfs/exports", NULL);
1333         remove_proc_entry("fs/nfs", NULL);
1334         nfsd_stat_shutdown();
1335         nfsd_lockd_shutdown();
1336         nfsd4_free_slabs();
1337         nfsd4_exit_pnfs();
1338         nfsd_fault_inject_cleanup();
1339         unregister_filesystem(&nfsd_fs_type);
1340         unregister_cld_notifier();
1341         unregister_pernet_subsys(&nfsd_net_ops);
1342 }
1343
1344 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1345 MODULE_LICENSE("GPL");
1346 module_init(init_nfsd)
1347 module_exit(exit_nfsd)