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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 #include <net/ipv6.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_path.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         struct in6_addr in6;
 227
 228         if (size < sizeof(*data))
 229                 return -EINVAL;
 230         data = (struct nfsctl_fsparm*)buf;
 231         err = -EPROTONOSUPPORT;
 232         if (data->gd_addr.sa_family != AF_INET)
 233                 goto out;
 234         sin = (struct sockaddr_in *)&data->gd_addr;
 235         if (data->gd_maxlen > NFS3_FHSIZE)
 236                 data->gd_maxlen = NFS3_FHSIZE;
 237
 238         res = (struct knfsd_fh*)buf;
 239
 240         exp_readlock();
 241
 242         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 243
 244         clp = auth_unix_lookup(&in6);
 245         if (!clp)
 246                 err = -EPERM;
 247         else {
 248                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 249                 auth_domain_put(clp);
 250         }
 251         exp_readunlock();
 252         if (err == 0)
 253                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 254  out:
 255         return err;
 256 }
 257
 258 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 259 {
 260         struct nfsctl_fdparm *data;
 261         struct sockaddr_in *sin;
 262         struct auth_domain *clp;
 263         int err = 0;
 264         struct knfsd_fh fh;
 265         char *res;
 266         struct in6_addr in6;
 267
 268         if (size < sizeof(*data))
 269                 return -EINVAL;
 270         data = (struct nfsctl_fdparm*)buf;
 271         err = -EPROTONOSUPPORT;
 272         if (data->gd_addr.sa_family != AF_INET)
 273                 goto out;
 274         err = -EINVAL;
 275         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 276                 goto out;
 277
 278         res = buf;
 279         sin = (struct sockaddr_in *)&data->gd_addr;
 280         exp_readlock();
 281
 282         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 283
 284         clp = auth_unix_lookup(&in6);
 285         if (!clp)
 286                 err = -EPERM;
 287         else {
 288                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 289                 auth_domain_put(clp);
 290         }
 291         exp_readunlock();
 292
 293         if (err == 0) {
 294                 memset(res,0, NFS_FHSIZE);
 295                 memcpy(res, &fh.fh_base, fh.fh_size);
 296                 err = NFS_FHSIZE;
 297         }
 298  out:
 299         return err;
 300 }
 301
 302 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 303 {
 304         /* request is:
 305          *   domain path maxsize
 306          * response is
 307          *   filehandle
 308          *
 309          * qword quoting is used, so filehandle will be \x....
 310          */
 311         char *dname, *path;
 312         int uninitialized_var(maxsize);
 313         char *mesg = buf;
 314         int len;
 315         struct auth_domain *dom;
 316         struct knfsd_fh fh;
 317
 318         if (size == 0)
 319                 return -EINVAL;
 320
 321         if (buf[size-1] != '\n')
 322                 return -EINVAL;
 323         buf[size-1] = 0;
 324
 325         dname = mesg;
 326         len = qword_get(&mesg, dname, size);
 327         if (len <= 0) return -EINVAL;
 328
 329         path = dname+len+1;
 330         len = qword_get(&mesg, path, size);
 331         if (len <= 0) return -EINVAL;
 332
 333         len = get_int(&mesg, &maxsize);
 334         if (len)
 335                 return len;
 336
 337         if (maxsize < NFS_FHSIZE)
 338                 return -EINVAL;
 339         if (maxsize > NFS3_FHSIZE)
 340                 maxsize = NFS3_FHSIZE;
 341
 342         if (qword_get(&mesg, mesg, size)>0)
 343                 return -EINVAL;
 344
 345         /* we have all the words, they are in buf.. */
 346         dom = unix_domain_find(dname);
 347         if (!dom)
 348                 return -ENOMEM;
 349
 350         len = exp_rootfh(dom, path, &fh,  maxsize);
 351         auth_domain_put(dom);
 352         if (len)
 353                 return len;
 354
 355         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 356         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 357         mesg[-1] = '\n';
 358         return mesg - buf;
 359 }
 360
 361 extern int nfsd_nrthreads(void);
 362
 363 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 364 {
 365         /* if size > 0, look for a number of threads and call nfsd_svc
 366          * then write out number of threads as reply
 367          */
 368         char *mesg = buf;
 369         int rv;
 370         if (size > 0) {
 371                 int newthreads;
 372                 rv = get_int(&mesg, &newthreads);
 373                 if (rv)
 374                         return rv;
 375                 if (newthreads <0)
 376                         return -EINVAL;
 377                 rv = nfsd_svc(2049, newthreads);
 378                 if (rv)
 379                         return rv;
 380         }
 381         sprintf(buf, "%d\n", nfsd_nrthreads());
 382         return strlen(buf);
 383 }
 384
 385 extern int nfsd_nrpools(void);
 386 extern int nfsd_get_nrthreads(int n, int *);
 387 extern int nfsd_set_nrthreads(int n, int *);
 388
 389 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 390 {
 391         /* if size > 0, look for an array of number of threads per node
 392          * and apply them  then write out number of threads per node as reply
 393          */
 394         char *mesg = buf;
 395         int i;
 396         int rv;
 397         int len;
 398         int npools = nfsd_nrpools();
 399         int *nthreads;
 400
 401         if (npools == 0) {
 402                 /*
 403                  * NFS is shut down.  The admin can start it by
 404                  * writing to the threads file but NOT the pool_threads
 405                  * file, sorry.  Report zero threads.
 406                  */
 407                 strcpy(buf, "0\n");
 408                 return strlen(buf);
 409         }
 410
 411         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 412         if (nthreads == NULL)
 413                 return -ENOMEM;
 414
 415         if (size > 0) {
 416                 for (i = 0; i < npools; i++) {
 417                         rv = get_int(&mesg, &nthreads[i]);
 418                         if (rv == -ENOENT)
 419                                 break;          /* fewer numbers than pools */
 420                         if (rv)
 421                                 goto out_free;  /* syntax error */
 422                         rv = -EINVAL;
 423                         if (nthreads[i] < 0)
 424                                 goto out_free;
 425                 }
 426                 rv = nfsd_set_nrthreads(i, nthreads);
 427                 if (rv)
 428                         goto out_free;
 429         }
 430
 431         rv = nfsd_get_nrthreads(npools, nthreads);
 432         if (rv)
 433                 goto out_free;
 434
 435         mesg = buf;
 436         size = SIMPLE_TRANSACTION_LIMIT;
 437         for (i = 0; i < npools && size > 0; i++) {
 438                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 439                 len = strlen(mesg);
 440                 size -= len;
 441                 mesg += len;
 442         }
 443
 444         return (mesg-buf);
 445
 446 out_free:
 447         kfree(nthreads);
 448         return rv;
 449 }
 450
 451 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 452 {
 453         /*
 454          * Format:
 455          *   [-/+]vers [-/+]vers ...
 456          */
 457         char *mesg = buf;
 458         char *vers, sign;
 459         int len, num;
 460         ssize_t tlen = 0;
 461         char *sep;
 462
 463         if (size>0) {
 464                 if (nfsd_serv)
 465                         /* Cannot change versions without updating
 466                          * nfsd_serv->sv_xdrsize, and reallocing
 467                          * rq_argp and rq_resp
 468                          */
 469                         return -EBUSY;
 470                 if (buf[size-1] != '\n')
 471                         return -EINVAL;
 472                 buf[size-1] = 0;
 473
 474                 vers = mesg;
 475                 len = qword_get(&mesg, vers, size);
 476                 if (len <= 0) return -EINVAL;
 477                 do {
 478                         sign = *vers;
 479                         if (sign == '+' || sign == '-')
 480                                 num = simple_strtol((vers+1), NULL, 0);
 481                         else
 482                                 num = simple_strtol(vers, NULL, 0);
 483                         switch(num) {
 484                         case 2:
 485                         case 3:
 486                         case 4:
 487                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 488                                 break;
 489                         default:
 490                                 return -EINVAL;
 491                         }
 492                         vers += len + 1;
 493                         tlen += len;
 494                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 495                 /* If all get turned off, turn them back on, as
 496                  * having no versions is BAD
 497                  */
 498                 nfsd_reset_versions();
 499         }
 500         /* Now write current state into reply buffer */
 501         len = 0;
 502         sep = "";
 503         for (num=2 ; num <= 4 ; num++)
 504                 if (nfsd_vers(num, NFSD_AVAIL)) {
 505                         len += sprintf(buf+len, "%s%c%d", sep,
 506                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 507                                        num);
 508                         sep = " ";
 509                 }
 510         len += sprintf(buf+len, "\n");
 511         return len;
 512 }
 513
 514 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 515 {
 516         if (size == 0) {
 517                 int len = 0;
 518                 lock_kernel();
 519                 if (nfsd_serv)
 520                         len = svc_xprt_names(nfsd_serv, buf, 0);
 521                 unlock_kernel();
 522                 return len;
 523         }
 524         /* Either a single 'fd' number is written, in which
 525          * case it must be for a socket of a supported family/protocol,
 526          * and we use it as an nfsd socket, or
 527          * A '-' followed by the 'name' of a socket in which case
 528          * we close the socket.
 529          */
 530         if (isdigit(buf[0])) {
 531                 char *mesg = buf;
 532                 int fd;
 533                 int err;
 534                 err = get_int(&mesg, &fd);
 535                 if (err)
 536                         return -EINVAL;
 537                 if (fd < 0)
 538                         return -EINVAL;
 539                 err = nfsd_create_serv();
 540                 if (!err) {
 541                         int proto = 0;
 542                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
 543                         if (err >= 0) {
 544                                 err = lockd_up(proto);
 545                                 if (err < 0)
 546                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 547                         }
 548                         /* Decrease the count, but don't shutdown the
 549                          * the service
 550                          */
 551                         lock_kernel();
 552                         nfsd_serv->sv_nrthreads--;
 553                         unlock_kernel();
 554                 }
 555                 return err < 0 ? err : 0;
 556         }
 557         if (buf[0] == '-' && isdigit(buf[1])) {
 558                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 559                 int len = 0;
 560                 if (!toclose)
 561                         return -ENOMEM;
 562                 lock_kernel();
 563                 if (nfsd_serv)
 564                         len = svc_sock_names(buf, nfsd_serv, toclose);
 565                 unlock_kernel();
 566                 if (len >= 0)
 567                         lockd_down();
 568                 kfree(toclose);
 569                 return len;
 570         }
 571         /*
 572          * Add a transport listener by writing it's transport name
 573          */
 574         if (isalpha(buf[0])) {
 575                 int err;
 576                 char transport[16];
 577                 int port;
 578                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 579                         err = nfsd_create_serv();
 580                         if (!err) {
 581                                 err = svc_create_xprt(nfsd_serv,
 582                                                       transport, port,
 583                                                       SVC_SOCK_ANONYMOUS);
 584                                 if (err == -ENOENT)
 585                                         /* Give a reasonable perror msg for
 586                                          * bad transport string */
 587                                         err = -EPROTONOSUPPORT;
 588                         }
 589                         return err < 0 ? err : 0;
 590                 }
 591         }
 592         /*
 593          * Remove a transport by writing it's transport name and port number
 594          */
 595         if (buf[0] == '-' && isalpha(buf[1])) {
 596                 struct svc_xprt *xprt;
 597                 int err = -EINVAL;
 598                 char transport[16];
 599                 int port;
 600                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 601                         if (port == 0)
 602                                 return -EINVAL;
 603                         lock_kernel();
 604                         if (nfsd_serv) {
 605                                 xprt = svc_find_xprt(nfsd_serv, transport,
 606                                                      AF_UNSPEC, port);
 607                                 if (xprt) {
 608                                         svc_close_xprt(xprt);
 609                                         svc_xprt_put(xprt);
 610                                         err = 0;
 611                                 } else
 612                                         err = -ENOTCONN;
 613                         }
 614                         unlock_kernel();
 615                         return err < 0 ? err : 0;
 616                 }
 617         }
 618         return -EINVAL;
 619 }
 620
 621 int nfsd_max_blksize;
 622
 623 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 624 {
 625         char *mesg = buf;
 626         if (size > 0) {
 627                 int bsize;
 628                 int rv = get_int(&mesg, &bsize);
 629                 if (rv)
 630                         return rv;
 631                 /* force bsize into allowed range and
 632                  * required alignment.
 633                  */
 634                 if (bsize < 1024)
 635                         bsize = 1024;
 636                 if (bsize > NFSSVC_MAXBLKSIZE)
 637                         bsize = NFSSVC_MAXBLKSIZE;
 638                 bsize &= ~(1024-1);
 639                 lock_kernel();
 640                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 641                         unlock_kernel();
 642                         return -EBUSY;
 643                 }
 644                 nfsd_max_blksize = bsize;
 645                 unlock_kernel();
 646         }
 647         return sprintf(buf, "%d\n", nfsd_max_blksize);
 648 }
 649
 650 #ifdef CONFIG_NFSD_V4
 651 extern time_t nfs4_leasetime(void);
 652
 653 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 654 {
 655         /* if size > 10 seconds, call
 656          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 657          */
 658         char *mesg = buf;
 659         int rv;
 660
 661         if (size > 0) {
 662                 int lease;
 663                 rv = get_int(&mesg, &lease);
 664                 if (rv)
 665                         return rv;
 666                 if (lease < 10 || lease > 3600)
 667                         return -EINVAL;
 668                 nfs4_reset_lease(lease);
 669         }
 670         sprintf(buf, "%ld\n", nfs4_lease_time());
 671         return strlen(buf);
 672 }
 673
 674 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 675 {
 676         char *mesg = buf;
 677         char *recdir;
 678         int len, status;
 679
 680         if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
 681                 return -EINVAL;
 682         buf[size-1] = 0;
 683
 684         recdir = mesg;
 685         len = qword_get(&mesg, recdir, size);
 686         if (len <= 0)
 687                 return -EINVAL;
 688
 689         status = nfs4_reset_recoverydir(recdir);
 690         return strlen(buf);
 691 }
 692 #endif
 693
 694 /*----------------------------------------------------------------------------*/
 695 /*
 696  *      populating the filesystem.
 697  */
 698
 699 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 700 {
 701         static struct tree_descr nfsd_files[] = {
 702                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 703                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 704                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 705                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 706                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 707                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 708                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 709                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 710                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 711                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 712                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 713                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 714                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 715                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 716 #ifdef CONFIG_NFSD_V4
 717                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 718                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 719 #endif
 720                 /* last one */ {""}
 721         };
 722         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 723 }
 724
 725 static int nfsd_get_sb(struct file_system_type *fs_type,
 726         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 727 {
 728         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 729 }
 730
 731 static struct file_system_type nfsd_fs_type = {
 732         .owner          = THIS_MODULE,
 733         .name           = "nfsd",
 734         .get_sb         = nfsd_get_sb,
 735         .kill_sb        = kill_litter_super,
 736 };
 737
 738 #ifdef CONFIG_PROC_FS
 739 static int create_proc_exports_entry(void)
 740 {
 741         struct proc_dir_entry *entry;
 742
 743         entry = proc_mkdir("fs/nfs", NULL);
 744         if (!entry)
 745                 return -ENOMEM;
 746         entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 747         if (!entry)
 748                 return -ENOMEM;
 749         entry->proc_fops =  &exports_operations;
 750         return 0;
 751 }
 752 #else /* CONFIG_PROC_FS */
 753 static int create_proc_exports_entry(void)
 754 {
 755         return 0;
 756 }
 757 #endif
 758
 759 static int __init init_nfsd(void)
 760 {
 761         int retval;
 762         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 763
 764         retval = nfs4_state_init(); /* nfs4 locking state */
 765         if (retval)
 766                 return retval;
 767         nfsd_stat_init();       /* Statistics */
 768         retval = nfsd_reply_cache_init();
 769         if (retval)
 770                 goto out_free_stat;
 771         retval = nfsd_export_init();
 772         if (retval)
 773                 goto out_free_cache;
 774         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 775         retval = nfsd_idmap_init();
 776         if (retval)
 777                 goto out_free_lockd;
 778         retval = create_proc_exports_entry();
 779         if (retval)
 780                 goto out_free_idmap;
 781         retval = register_filesystem(&nfsd_fs_type);
 782         if (retval)
 783                 goto out_free_all;
 784         return 0;
 785 out_free_all:
 786         remove_proc_entry("fs/nfs/exports", NULL);
 787         remove_proc_entry("fs/nfs", NULL);
 788 out_free_idmap:
 789         nfsd_idmap_shutdown();
 790 out_free_lockd:
 791         nfsd_lockd_shutdown();
 792         nfsd_export_shutdown();
 793 out_free_cache:
 794         nfsd_reply_cache_shutdown();
 795 out_free_stat:
 796         nfsd_stat_shutdown();
 797         nfsd4_free_slabs();
 798         return retval;
 799 }
 800
 801 static void __exit exit_nfsd(void)
 802 {
 803         nfsd_export_shutdown();
 804         nfsd_reply_cache_shutdown();
 805         remove_proc_entry("fs/nfs/exports", NULL);
 806         remove_proc_entry("fs/nfs", NULL);
 807         nfsd_stat_shutdown();
 808         nfsd_lockd_shutdown();
 809         nfsd_idmap_shutdown();
 810         nfsd4_free_slabs();
 811         unregister_filesystem(&nfsd_fs_type);
 812 }
 813
 814 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 815 MODULE_LICENSE("GPL");
 816 module_init(init_nfsd)
 817 module_exit(exit_nfsd)