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