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