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