git.oblomov.eu Git - linux-2.6/blob - fs/nfsd/nfsctl.c

   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/module.h>
  10
  11 #include <linux/linkage.h>
  12 #include <linux/time.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/net.h>
  17 #include <linux/in.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/unistd.h>
  20 #include <linux/slab.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/pagemap.h>
  24 #include <linux/init.h>
  25 #include <linux/string.h>
  26 #include <linux/smp_lock.h>
  27 #include <linux/ctype.h>
  28
  29 #include <linux/nfs.h>
  30 #include <linux/nfsd_idmap.h>
  31 #include <linux/lockd/bind.h>
  32 #include <linux/sunrpc/svc.h>
  33 #include <linux/sunrpc/svcsock.h>
  34 #include <linux/nfsd/nfsd.h>
  35 #include <linux/nfsd/cache.h>
  36 #include <linux/nfsd/xdr.h>
  37 #include <linux/nfsd/syscall.h>
  38 #include <linux/nfsd/interface.h>
  39
  40 #include <asm/uaccess.h>
  41
  42 /*
  43  *      We have a single directory with 9 nodes in it.
  44  */
  45 enum {
  46         NFSD_Root = 1,
  47         NFSD_Svc,
  48         NFSD_Add,
  49         NFSD_Del,
  50         NFSD_Export,
  51         NFSD_Unexport,
  52         NFSD_Getfd,
  53         NFSD_Getfs,
  54         NFSD_List,
  55         NFSD_Fh,
  56         NFSD_Threads,
  57         NFSD_Pool_Threads,
  58         NFSD_Versions,
  59         NFSD_Ports,
  60         NFSD_MaxBlkSize,
  61         /*
  62          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  63          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  64          */
  65 #ifdef CONFIG_NFSD_V4
  66         NFSD_Leasetime,
  67         NFSD_RecoveryDir,
  68 #endif
  69 };
  70
  71 /*
  72  * write() for these nodes.
  73  */
  74 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  75 static ssize_t write_add(struct file *file, char *buf, size_t size);
  76 static ssize_t write_del(struct file *file, char *buf, size_t size);
  77 static ssize_t write_export(struct file *file, char *buf, size_t size);
  78 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  79 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  80 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  81 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  82 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  83 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  84 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  85 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  86 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  87 #ifdef CONFIG_NFSD_V4
  88 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  89 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  90 #endif
  91
  92 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  93         [NFSD_Svc] = write_svc,
  94         [NFSD_Add] = write_add,
  95         [NFSD_Del] = write_del,
  96         [NFSD_Export] = write_export,
  97         [NFSD_Unexport] = write_unexport,
  98         [NFSD_Getfd] = write_getfd,
  99         [NFSD_Getfs] = write_getfs,
 100         [NFSD_Fh] = write_filehandle,
 101         [NFSD_Threads] = write_threads,
 102         [NFSD_Pool_Threads] = write_pool_threads,
 103         [NFSD_Versions] = write_versions,
 104         [NFSD_Ports] = write_ports,
 105         [NFSD_MaxBlkSize] = write_maxblksize,
 106 #ifdef CONFIG_NFSD_V4
 107         [NFSD_Leasetime] = write_leasetime,
 108         [NFSD_RecoveryDir] = write_recoverydir,
 109 #endif
 110 };
 111
 112 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 113 {
 114         ino_t ino =  file->f_dentry->d_inode->i_ino;
 115         char *data;
 116         ssize_t rv;
 117
 118         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 119                 return -EINVAL;
 120
 121         data = simple_transaction_get(file, buf, size);
 122         if (IS_ERR(data))
 123                 return PTR_ERR(data);
 124
 125         rv =  write_op[ino](file, data, size);
 126         if (rv>0) {
 127                 simple_transaction_set(file, rv);
 128                 rv = size;
 129         }
 130         return rv;
 131 }
 132
 133 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 134 {
 135         if (! file->private_data) {
 136                 /* An attempt to read a transaction file without writing
 137                  * causes a 0-byte write so that the file can return
 138                  * state information
 139                  */
 140                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 141                 if (rv < 0)
 142                         return rv;
 143         }
 144         return simple_transaction_read(file, buf, size, pos);
 145 }
 146
 147 static const struct file_operations transaction_ops = {
 148         .write          = nfsctl_transaction_write,
 149         .read           = nfsctl_transaction_read,
 150         .release        = simple_transaction_release,
 151 };
 152
 153 extern struct seq_operations nfs_exports_op;
 154 static int exports_open(struct inode *inode, struct file *file)
 155 {
 156         return seq_open(file, &nfs_exports_op);
 157 }
 158
 159 static const struct file_operations exports_operations = {
 160         .open           = exports_open,
 161         .read           = seq_read,
 162         .llseek         = seq_lseek,
 163         .release        = seq_release,
 164 };
 165
 166 /*----------------------------------------------------------------------------*/
 167 /*
 168  * payload - write methods
 169  * If the method has a response, the response should be put in buf,
 170  * and the length returned.  Otherwise return 0 or and -error.
 171  */
 172
 173 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 174 {
 175         struct nfsctl_svc *data;
 176         if (size < sizeof(*data))
 177                 return -EINVAL;
 178         data = (struct nfsctl_svc*) buf;
 179         return nfsd_svc(data->svc_port, data->svc_nthreads);
 180 }
 181
 182 static ssize_t write_add(struct file *file, char *buf, size_t size)
 183 {
 184         struct nfsctl_client *data;
 185         if (size < sizeof(*data))
 186                 return -EINVAL;
 187         data = (struct nfsctl_client *)buf;
 188         return exp_addclient(data);
 189 }
 190
 191 static ssize_t write_del(struct file *file, char *buf, size_t size)
 192 {
 193         struct nfsctl_client *data;
 194         if (size < sizeof(*data))
 195                 return -EINVAL;
 196         data = (struct nfsctl_client *)buf;
 197         return exp_delclient(data);
 198 }
 199
 200 static ssize_t write_export(struct file *file, char *buf, size_t size)
 201 {
 202         struct nfsctl_export *data;
 203         if (size < sizeof(*data))
 204                 return -EINVAL;
 205         data = (struct nfsctl_export*)buf;
 206         return exp_export(data);
 207 }
 208
 209 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 210 {
 211         struct nfsctl_export *data;
 212
 213         if (size < sizeof(*data))
 214                 return -EINVAL;
 215         data = (struct nfsctl_export*)buf;
 216         return exp_unexport(data);
 217 }
 218
 219 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 220 {
 221         struct nfsctl_fsparm *data;
 222         struct sockaddr_in *sin;
 223         struct auth_domain *clp;
 224         int err = 0;
 225         struct knfsd_fh *res;
 226
 227         if (size < sizeof(*data))
 228                 return -EINVAL;
 229         data = (struct nfsctl_fsparm*)buf;
 230         err = -EPROTONOSUPPORT;
 231         if (data->gd_addr.sa_family != AF_INET)
 232                 goto out;
 233         sin = (struct sockaddr_in *)&data->gd_addr;
 234         if (data->gd_maxlen > NFS3_FHSIZE)
 235                 data->gd_maxlen = NFS3_FHSIZE;
 236
 237         res = (struct knfsd_fh*)buf;
 238
 239         exp_readlock();
 240         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 241                 err = -EPERM;
 242         else {
 243                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 244                 auth_domain_put(clp);
 245         }
 246         exp_readunlock();
 247         if (err == 0)
 248                 err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
 249  out:
 250         return err;
 251 }
 252
 253 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 254 {
 255         struct nfsctl_fdparm *data;
 256         struct sockaddr_in *sin;
 257         struct auth_domain *clp;
 258         int err = 0;
 259         struct knfsd_fh fh;
 260         char *res;
 261
 262         if (size < sizeof(*data))
 263                 return -EINVAL;
 264         data = (struct nfsctl_fdparm*)buf;
 265         err = -EPROTONOSUPPORT;
 266         if (data->gd_addr.sa_family != AF_INET)
 267                 goto out;
 268         err = -EINVAL;
 269         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 270                 goto out;
 271
 272         res = buf;
 273         sin = (struct sockaddr_in *)&data->gd_addr;
 274         exp_readlock();
 275         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 276                 err = -EPERM;
 277         else {
 278                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 279                 auth_domain_put(clp);
 280         }
 281         exp_readunlock();
 282
 283         if (err == 0) {
 284                 memset(res,0, NFS_FHSIZE);
 285                 memcpy(res, &fh.fh_base, fh.fh_size);
 286                 err = NFS_FHSIZE;
 287         }
 288  out:
 289         return err;
 290 }
 291
 292 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 293 {
 294         /* request is:
 295          *   domain path maxsize
 296          * response is
 297          *   filehandle
 298          *
 299          * qword quoting is used, so filehandle will be \x....
 300          */
 301         char *dname, *path;
 302         int maxsize;
 303         char *mesg = buf;
 304         int len;
 305         struct auth_domain *dom;
 306         struct knfsd_fh fh;
 307
 308         if (buf[size-1] != '\n')
 309                 return -EINVAL;
 310         buf[size-1] = 0;
 311
 312         dname = mesg;
 313         len = qword_get(&mesg, dname, size);
 314         if (len <= 0) return -EINVAL;
 315
 316         path = dname+len+1;
 317         len = qword_get(&mesg, path, size);
 318         if (len <= 0) return -EINVAL;
 319
 320         len = get_int(&mesg, &maxsize);
 321         if (len)
 322                 return len;
 323
 324         if (maxsize < NFS_FHSIZE)
 325                 return -EINVAL;
 326         if (maxsize > NFS3_FHSIZE)
 327                 maxsize = NFS3_FHSIZE;
 328
 329         if (qword_get(&mesg, mesg, size)>0)
 330                 return -EINVAL;
 331
 332         /* we have all the words, they are in buf.. */
 333         dom = unix_domain_find(dname);
 334         if (!dom)
 335                 return -ENOMEM;
 336
 337         len = exp_rootfh(dom, path, &fh,  maxsize);
 338         auth_domain_put(dom);
 339         if (len)
 340                 return len;
 341
 342         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 343         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 344         mesg[-1] = '\n';
 345         return mesg - buf;
 346 }
 347
 348 extern int nfsd_nrthreads(void);
 349
 350 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 351 {
 352         /* if size > 0, look for a number of threads and call nfsd_svc
 353          * then write out number of threads as reply
 354          */
 355         char *mesg = buf;
 356         int rv;
 357         if (size > 0) {
 358                 int newthreads;
 359                 rv = get_int(&mesg, &newthreads);
 360                 if (rv)
 361                         return rv;
 362                 if (newthreads <0)
 363                         return -EINVAL;
 364                 rv = nfsd_svc(2049, newthreads);
 365                 if (rv)
 366                         return rv;
 367         }
 368         sprintf(buf, "%d\n", nfsd_nrthreads());
 369         return strlen(buf);
 370 }
 371
 372 extern int nfsd_nrpools(void);
 373 extern int nfsd_get_nrthreads(int n, int *);
 374 extern int nfsd_set_nrthreads(int n, int *);
 375
 376 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 377 {
 378         /* if size > 0, look for an array of number of threads per node
 379          * and apply them  then write out number of threads per node as reply
 380          */
 381         char *mesg = buf;
 382         int i;
 383         int rv;
 384         int len;
 385         int npools = nfsd_nrpools();
 386         int *nthreads;
 387
 388         if (npools == 0) {
 389                 /*
 390                  * NFS is shut down.  The admin can start it by
 391                  * writing to the threads file but NOT the pool_threads
 392                  * file, sorry.  Report zero threads.
 393                  */
 394                 strcpy(buf, "0\n");
 395                 return strlen(buf);
 396         }
 397
 398         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 399         if (nthreads == NULL)
 400                 return -ENOMEM;
 401
 402         if (size > 0) {
 403                 for (i = 0; i < npools; i++) {
 404                         rv = get_int(&mesg, &nthreads[i]);
 405                         if (rv == -ENOENT)
 406                                 break;          /* fewer numbers than pools */
 407                         if (rv)
 408                                 goto out_free;  /* syntax error */
 409                         rv = -EINVAL;
 410                         if (nthreads[i] < 0)
 411                                 goto out_free;
 412                 }
 413                 rv = nfsd_set_nrthreads(i, nthreads);
 414                 if (rv)
 415                         goto out_free;
 416         }
 417
 418         rv = nfsd_get_nrthreads(npools, nthreads);
 419         if (rv)
 420                 goto out_free;
 421
 422         mesg = buf;
 423         size = SIMPLE_TRANSACTION_LIMIT;
 424         for (i = 0; i < npools && size > 0; i++) {
 425                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 426                 len = strlen(mesg);
 427                 size -= len;
 428                 mesg += len;
 429         }
 430
 431         return (mesg-buf);
 432
 433 out_free:
 434         kfree(nthreads);
 435         return rv;
 436 }
 437
 438 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 439 {
 440         /*
 441          * Format:
 442          *   [-/+]vers [-/+]vers ...
 443          */
 444         char *mesg = buf;
 445         char *vers, sign;
 446         int len, num;
 447         ssize_t tlen = 0;
 448         char *sep;
 449
 450         if (size>0) {
 451                 if (nfsd_serv)
 452                         /* Cannot change versions without updating
 453                          * nfsd_serv->sv_xdrsize, and reallocing
 454                          * rq_argp and rq_resp
 455                          */
 456                         return -EBUSY;
 457                 if (buf[size-1] != '\n')
 458                         return -EINVAL;
 459                 buf[size-1] = 0;
 460
 461                 vers = mesg;
 462                 len = qword_get(&mesg, vers, size);
 463                 if (len <= 0) return -EINVAL;
 464                 do {
 465                         sign = *vers;
 466                         if (sign == '+' || sign == '-')
 467                                 num = simple_strtol((vers+1), NULL, 0);
 468                         else
 469                                 num = simple_strtol(vers, NULL, 0);
 470                         switch(num) {
 471                         case 2:
 472                         case 3:
 473                         case 4:
 474                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 475                                 break;
 476                         default:
 477                                 return -EINVAL;
 478                         }
 479                         vers += len + 1;
 480                         tlen += len;
 481                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 482                 /* If all get turned off, turn them back on, as
 483                  * having no versions is BAD
 484                  */
 485                 nfsd_reset_versions();
 486         }
 487         /* Now write current state into reply buffer */
 488         len = 0;
 489         sep = "";
 490         for (num=2 ; num <= 4 ; num++)
 491                 if (nfsd_vers(num, NFSD_AVAIL)) {
 492                         len += sprintf(buf+len, "%s%c%d", sep,
 493                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 494                                        num);
 495                         sep = " ";
 496                 }
 497         len += sprintf(buf+len, "\n");
 498         return len;
 499 }
 500
 501 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 502 {
 503         if (size == 0) {
 504                 int len = 0;
 505                 lock_kernel();
 506                 if (nfsd_serv)
 507                         len = svc_sock_names(buf, nfsd_serv, NULL);
 508                 unlock_kernel();
 509                 return len;
 510         }
 511         /* Either a single 'fd' number is written, in which
 512          * case it must be for a socket of a supported family/protocol,
 513          * and we use it as an nfsd socket, or
 514          * A '-' followed by the 'name' of a socket in which case
 515          * we close the socket.
 516          */
 517         if (isdigit(buf[0])) {
 518                 char *mesg = buf;
 519                 int fd;
 520                 int err;
 521                 err = get_int(&mesg, &fd);
 522                 if (err)
 523                         return -EINVAL;
 524                 if (fd < 0)
 525                         return -EINVAL;
 526                 err = nfsd_create_serv();
 527                 if (!err) {
 528                         int proto = 0;
 529                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
 530                         if (err >= 0) {
 531                                 err = lockd_up(proto);
 532                                 if (err < 0)
 533                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 534                         }
 535                         /* Decrease the count, but don't shutdown the
 536                          * the service
 537                          */
 538                         lock_kernel();
 539                         nfsd_serv->sv_nrthreads--;
 540                         unlock_kernel();
 541                 }
 542                 return err < 0 ? err : 0;
 543         }
 544         if (buf[0] == '-') {
 545                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 546                 int len = 0;
 547                 if (!toclose)
 548                         return -ENOMEM;
 549                 lock_kernel();
 550                 if (nfsd_serv)
 551                         len = svc_sock_names(buf, nfsd_serv, toclose);
 552                 unlock_kernel();
 553                 if (len >= 0)
 554                         lockd_down();
 555                 kfree(toclose);
 556                 return len;
 557         }
 558         return -EINVAL;
 559 }
 560
 561 int nfsd_max_blksize;
 562
 563 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 564 {
 565         char *mesg = buf;
 566         if (size > 0) {
 567                 int bsize;
 568                 int rv = get_int(&mesg, &bsize);
 569                 if (rv)
 570                         return rv;
 571                 /* force bsize into allowed range and
 572                  * required alignment.
 573                  */
 574                 if (bsize < 1024)
 575                         bsize = 1024;
 576                 if (bsize > NFSSVC_MAXBLKSIZE)
 577                         bsize = NFSSVC_MAXBLKSIZE;
 578                 bsize &= ~(1024-1);
 579                 lock_kernel();
 580                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 581                         unlock_kernel();
 582                         return -EBUSY;
 583                 }
 584                 nfsd_max_blksize = bsize;
 585                 unlock_kernel();
 586         }
 587         return sprintf(buf, "%d\n", nfsd_max_blksize);
 588 }
 589
 590 #ifdef CONFIG_NFSD_V4
 591 extern time_t nfs4_leasetime(void);
 592
 593 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 594 {
 595         /* if size > 10 seconds, call
 596          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 597          */
 598         char *mesg = buf;
 599         int rv;
 600
 601         if (size > 0) {
 602                 int lease;
 603                 rv = get_int(&mesg, &lease);
 604                 if (rv)
 605                         return rv;
 606                 if (lease < 10 || lease > 3600)
 607                         return -EINVAL;
 608                 nfs4_reset_lease(lease);
 609         }
 610         sprintf(buf, "%ld\n", nfs4_lease_time());
 611         return strlen(buf);
 612 }
 613
 614 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 615 {
 616         char *mesg = buf;
 617         char *recdir;
 618         int len, status;
 619
 620         if (size > PATH_MAX || buf[size-1] != '\n')
 621                 return -EINVAL;
 622         buf[size-1] = 0;
 623
 624         recdir = mesg;
 625         len = qword_get(&mesg, recdir, size);
 626         if (len <= 0)
 627                 return -EINVAL;
 628
 629         status = nfs4_reset_recoverydir(recdir);
 630         return strlen(buf);
 631 }
 632 #endif
 633
 634 /*----------------------------------------------------------------------------*/
 635 /*
 636  *      populating the filesystem.
 637  */
 638
 639 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 640 {
 641         static struct tree_descr nfsd_files[] = {
 642                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 643                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 644                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 645                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 646                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 647                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 648                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 649                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 650                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 651                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 652                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 653                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 654                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 655                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 656 #ifdef CONFIG_NFSD_V4
 657                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 658                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 659 #endif
 660                 /* last one */ {""}
 661         };
 662         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 663 }
 664
 665 static int nfsd_get_sb(struct file_system_type *fs_type,
 666         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 667 {
 668         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 669 }
 670
 671 static struct file_system_type nfsd_fs_type = {
 672         .owner          = THIS_MODULE,
 673         .name           = "nfsd",
 674         .get_sb         = nfsd_get_sb,
 675         .kill_sb        = kill_litter_super,
 676 };
 677
 678 static int __init init_nfsd(void)
 679 {
 680         int retval;
 681         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 682
 683         nfsd_stat_init();       /* Statistics */
 684         nfsd_cache_init();      /* RPC reply cache */
 685         nfsd_export_init();     /* Exports table */
 686         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 687         nfs4_state_init();      /* NFSv4 locking state */
 688         nfsd_idmap_init();      /* Name to ID mapping */
 689         if (proc_mkdir("fs/nfs", NULL)) {
 690                 struct proc_dir_entry *entry;
 691                 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 692                 if (entry)
 693                         entry->proc_fops =  &exports_operations;
 694         }
 695         retval = register_filesystem(&nfsd_fs_type);
 696         if (retval) {
 697                 nfsd_export_shutdown();
 698                 nfsd_cache_shutdown();
 699                 remove_proc_entry("fs/nfs/exports", NULL);
 700                 remove_proc_entry("fs/nfs", NULL);
 701                 nfsd_stat_shutdown();
 702                 nfsd_lockd_shutdown();
 703         }
 704         return retval;
 705 }
 706
 707 static void __exit exit_nfsd(void)
 708 {
 709         nfsd_export_shutdown();
 710         nfsd_cache_shutdown();
 711         remove_proc_entry("fs/nfs/exports", NULL);
 712         remove_proc_entry("fs/nfs", NULL);
 713         nfsd_stat_shutdown();
 714         nfsd_lockd_shutdown();
 715         nfsd_idmap_shutdown();
 716         unregister_filesystem(&nfsd_fs_type);
 717 }
 718
 719 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 720 MODULE_LICENSE("GPL");
 721 module_init(init_nfsd)
 722 module_exit(exit_nfsd)