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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/namei.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/net.h>
  18 #include <linux/in.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/unistd.h>
  21 #include <linux/slab.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/init.h>
  26 #include <linux/inet.h>
  27 #include <linux/string.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/ctype.h>
  30
  31 #include <linux/nfs.h>
  32 #include <linux/nfsd_idmap.h>
  33 #include <linux/lockd/bind.h>
  34 #include <linux/sunrpc/svc.h>
  35 #include <linux/sunrpc/svcsock.h>
  36 #include <linux/nfsd/nfsd.h>
  37 #include <linux/nfsd/cache.h>
  38 #include <linux/nfsd/xdr.h>
  39 #include <linux/nfsd/syscall.h>
  40 #include <linux/lockd/lockd.h>
  41
  42 #include <asm/uaccess.h>
  43 #include <net/ipv6.h>
  44
  45 /*
  46  *      We have a single directory with 9 nodes in it.
  47  */
  48 enum {
  49         NFSD_Root = 1,
  50         NFSD_Svc,
  51         NFSD_Add,
  52         NFSD_Del,
  53         NFSD_Export,
  54         NFSD_Unexport,
  55         NFSD_Getfd,
  56         NFSD_Getfs,
  57         NFSD_List,
  58         NFSD_Fh,
  59         NFSD_FO_UnlockIP,
  60         NFSD_FO_UnlockFS,
  61         NFSD_Threads,
  62         NFSD_Pool_Threads,
  63         NFSD_Versions,
  64         NFSD_Ports,
  65         NFSD_MaxBlkSize,
  66         /*
  67          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  68          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  69          */
  70 #ifdef CONFIG_NFSD_V4
  71         NFSD_Leasetime,
  72         NFSD_RecoveryDir,
  73 #endif
  74 };
  75
  76 /*
  77  * write() for these nodes.
  78  */
  79 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  80 static ssize_t write_add(struct file *file, char *buf, size_t size);
  81 static ssize_t write_del(struct file *file, char *buf, size_t size);
  82 static ssize_t write_export(struct file *file, char *buf, size_t size);
  83 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  84 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  85 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  86 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  87 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  88 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  89 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  90 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  91 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  92 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  93 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  94 #ifdef CONFIG_NFSD_V4
  95 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  96 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  97 #endif
  98
  99 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 100         [NFSD_Svc] = write_svc,
 101         [NFSD_Add] = write_add,
 102         [NFSD_Del] = write_del,
 103         [NFSD_Export] = write_export,
 104         [NFSD_Unexport] = write_unexport,
 105         [NFSD_Getfd] = write_getfd,
 106         [NFSD_Getfs] = write_getfs,
 107         [NFSD_Fh] = write_filehandle,
 108         [NFSD_FO_UnlockIP] = write_unlock_ip,
 109         [NFSD_FO_UnlockFS] = write_unlock_fs,
 110         [NFSD_Threads] = write_threads,
 111         [NFSD_Pool_Threads] = write_pool_threads,
 112         [NFSD_Versions] = write_versions,
 113         [NFSD_Ports] = write_ports,
 114         [NFSD_MaxBlkSize] = write_maxblksize,
 115 #ifdef CONFIG_NFSD_V4
 116         [NFSD_Leasetime] = write_leasetime,
 117         [NFSD_RecoveryDir] = write_recoverydir,
 118 #endif
 119 };
 120
 121 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 122 {
 123         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 124         char *data;
 125         ssize_t rv;
 126
 127         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 128                 return -EINVAL;
 129
 130         data = simple_transaction_get(file, buf, size);
 131         if (IS_ERR(data))
 132                 return PTR_ERR(data);
 133
 134         rv =  write_op[ino](file, data, size);
 135         if (rv >= 0) {
 136                 simple_transaction_set(file, rv);
 137                 rv = size;
 138         }
 139         return rv;
 140 }
 141
 142 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 143 {
 144         if (! file->private_data) {
 145                 /* An attempt to read a transaction file without writing
 146                  * causes a 0-byte write so that the file can return
 147                  * state information
 148                  */
 149                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 150                 if (rv < 0)
 151                         return rv;
 152         }
 153         return simple_transaction_read(file, buf, size, pos);
 154 }
 155
 156 static const struct file_operations transaction_ops = {
 157         .write          = nfsctl_transaction_write,
 158         .read           = nfsctl_transaction_read,
 159         .release        = simple_transaction_release,
 160 };
 161
 162 static int exports_open(struct inode *inode, struct file *file)
 163 {
 164         return seq_open(file, &nfs_exports_op);
 165 }
 166
 167 static const struct file_operations exports_operations = {
 168         .open           = exports_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = seq_release,
 172         .owner          = THIS_MODULE,
 173 };
 174
 175 /*----------------------------------------------------------------------------*/
 176 /*
 177  * payload - write methods
 178  */
 179
 180 /**
 181  * write_svc - Start kernel's NFSD server
 182  *
 183  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 184  * Function remains to support old versions of nfs-utils.
 185  *
 186  * Input:
 187  *                      buf:    struct nfsctl_svc
 188  *                              svc_port:       port number of this
 189  *                                              server's listener
 190  *                              svc_nthreads:   number of threads to start
 191  *                      size:   size in bytes of passed in nfsctl_svc
 192  * Output:
 193  *      On success:     returns zero
 194  *      On error:       return code is negative errno value
 195  */
 196 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 197 {
 198         struct nfsctl_svc *data;
 199         if (size < sizeof(*data))
 200                 return -EINVAL;
 201         data = (struct nfsctl_svc*) buf;
 202         return nfsd_svc(data->svc_port, data->svc_nthreads);
 203 }
 204
 205 /**
 206  * write_add - Add or modify client entry in auth unix cache
 207  *
 208  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 209  * Function remains to support old versions of nfs-utils.
 210  *
 211  * Input:
 212  *                      buf:    struct nfsctl_client
 213  *                              cl_ident:       '\0'-terminated C string
 214  *                                              containing domain name
 215  *                                              of client
 216  *                              cl_naddr:       no. of items in cl_addrlist
 217  *                              cl_addrlist:    array of client addresses
 218  *                              cl_fhkeytype:   ignored
 219  *                              cl_fhkeylen:    ignored
 220  *                              cl_fhkey:       ignored
 221  *                      size:   size in bytes of passed in nfsctl_client
 222  * Output:
 223  *      On success:     returns zero
 224  *      On error:       return code is negative errno value
 225  *
 226  * Note: Only AF_INET client addresses are passed in, since
 227  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 228  */
 229 static ssize_t write_add(struct file *file, char *buf, size_t size)
 230 {
 231         struct nfsctl_client *data;
 232         if (size < sizeof(*data))
 233                 return -EINVAL;
 234         data = (struct nfsctl_client *)buf;
 235         return exp_addclient(data);
 236 }
 237
 238 /**
 239  * write_del - Remove client from auth unix cache
 240  *
 241  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 242  * Function remains to support old versions of nfs-utils.
 243  *
 244  * Input:
 245  *                      buf:    struct nfsctl_client
 246  *                              cl_ident:       '\0'-terminated C string
 247  *                                              containing domain name
 248  *                                              of client
 249  *                              cl_naddr:       ignored
 250  *                              cl_addrlist:    ignored
 251  *                              cl_fhkeytype:   ignored
 252  *                              cl_fhkeylen:    ignored
 253  *                              cl_fhkey:       ignored
 254  *                      size:   size in bytes of passed in nfsctl_client
 255  * Output:
 256  *      On success:     returns zero
 257  *      On error:       return code is negative errno value
 258  *
 259  * Note: Only AF_INET client addresses are passed in, since
 260  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 261  */
 262 static ssize_t write_del(struct file *file, char *buf, size_t size)
 263 {
 264         struct nfsctl_client *data;
 265         if (size < sizeof(*data))
 266                 return -EINVAL;
 267         data = (struct nfsctl_client *)buf;
 268         return exp_delclient(data);
 269 }
 270
 271 /**
 272  * write_export - Export part or all of a local file system
 273  *
 274  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 275  * Function remains to support old versions of nfs-utils.
 276  *
 277  * Input:
 278  *                      buf:    struct nfsctl_export
 279  *                              ex_client:      '\0'-terminated C string
 280  *                                              containing domain name
 281  *                                              of client allowed to access
 282  *                                              this export
 283  *                              ex_path:        '\0'-terminated C string
 284  *                                              containing pathname of
 285  *                                              directory in local file system
 286  *                              ex_dev:         fsid to use for this export
 287  *                              ex_ino:         ignored
 288  *                              ex_flags:       export flags for this export
 289  *                              ex_anon_uid:    UID to use for anonymous
 290  *                                              requests
 291  *                              ex_anon_gid:    GID to use for anonymous
 292  *                                              requests
 293  *                      size:   size in bytes of passed in nfsctl_export
 294  * Output:
 295  *      On success:     returns zero
 296  *      On error:       return code is negative errno value
 297  */
 298 static ssize_t write_export(struct file *file, char *buf, size_t size)
 299 {
 300         struct nfsctl_export *data;
 301         if (size < sizeof(*data))
 302                 return -EINVAL;
 303         data = (struct nfsctl_export*)buf;
 304         return exp_export(data);
 305 }
 306
 307 /**
 308  * write_unexport - Unexport a previously exported file system
 309  *
 310  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 311  * Function remains to support old versions of nfs-utils.
 312  *
 313  * Input:
 314  *                      buf:    struct nfsctl_export
 315  *                              ex_client:      '\0'-terminated C string
 316  *                                              containing domain name
 317  *                                              of client no longer allowed
 318  *                                              to access this export
 319  *                              ex_path:        '\0'-terminated C string
 320  *                                              containing pathname of
 321  *                                              directory in local file system
 322  *                              ex_dev:         ignored
 323  *                              ex_ino:         ignored
 324  *                              ex_flags:       ignored
 325  *                              ex_anon_uid:    ignored
 326  *                              ex_anon_gid:    ignored
 327  *                      size:   size in bytes of passed in nfsctl_export
 328  * Output:
 329  *      On success:     returns zero
 330  *      On error:       return code is negative errno value
 331  */
 332 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 333 {
 334         struct nfsctl_export *data;
 335
 336         if (size < sizeof(*data))
 337                 return -EINVAL;
 338         data = (struct nfsctl_export*)buf;
 339         return exp_unexport(data);
 340 }
 341
 342 /**
 343  * write_getfs - Get a variable-length NFS file handle by path
 344  *
 345  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 346  * Function remains to support old versions of nfs-utils.
 347  *
 348  * Input:
 349  *                      buf:    struct nfsctl_fsparm
 350  *                              gd_addr:        socket address of client
 351  *                              gd_path:        '\0'-terminated C string
 352  *                                              containing pathname of
 353  *                                              directory in local file system
 354  *                              gd_maxlen:      maximum size of returned file
 355  *                                              handle
 356  *                      size:   size in bytes of passed in nfsctl_fsparm
 357  * Output:
 358  *      On success:     passed-in buffer filled with a knfsd_fh structure
 359  *                      (a variable-length raw NFS file handle);
 360  *                      return code is the size in bytes of the file handle
 361  *      On error:       return code is negative errno value
 362  *
 363  * Note: Only AF_INET client addresses are passed in, since gd_addr
 364  * is the same size as a struct sockaddr_in.
 365  */
 366 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 367 {
 368         struct nfsctl_fsparm *data;
 369         struct sockaddr_in *sin;
 370         struct auth_domain *clp;
 371         int err = 0;
 372         struct knfsd_fh *res;
 373         struct in6_addr in6;
 374
 375         if (size < sizeof(*data))
 376                 return -EINVAL;
 377         data = (struct nfsctl_fsparm*)buf;
 378         err = -EPROTONOSUPPORT;
 379         if (data->gd_addr.sa_family != AF_INET)
 380                 goto out;
 381         sin = (struct sockaddr_in *)&data->gd_addr;
 382         if (data->gd_maxlen > NFS3_FHSIZE)
 383                 data->gd_maxlen = NFS3_FHSIZE;
 384
 385         res = (struct knfsd_fh*)buf;
 386
 387         exp_readlock();
 388
 389         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 390
 391         clp = auth_unix_lookup(&in6);
 392         if (!clp)
 393                 err = -EPERM;
 394         else {
 395                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 396                 auth_domain_put(clp);
 397         }
 398         exp_readunlock();
 399         if (err == 0)
 400                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 401  out:
 402         return err;
 403 }
 404
 405 /**
 406  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 407  *
 408  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 409  * Function remains to support old versions of nfs-utils.
 410  *
 411  * Input:
 412  *                      buf:    struct nfsctl_fdparm
 413  *                              gd_addr:        socket address of client
 414  *                              gd_path:        '\0'-terminated C string
 415  *                                              containing pathname of
 416  *                                              directory in local file system
 417  *                              gd_version:     fdparm structure version
 418  *                      size:   size in bytes of passed in nfsctl_fdparm
 419  * Output:
 420  *      On success:     passed-in buffer filled with nfsctl_res
 421  *                      (a fixed-length raw NFS file handle);
 422  *                      return code is the size in bytes of the file handle
 423  *      On error:       return code is negative errno value
 424  *
 425  * Note: Only AF_INET client addresses are passed in, since gd_addr
 426  * is the same size as a struct sockaddr_in.
 427  */
 428 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 429 {
 430         struct nfsctl_fdparm *data;
 431         struct sockaddr_in *sin;
 432         struct auth_domain *clp;
 433         int err = 0;
 434         struct knfsd_fh fh;
 435         char *res;
 436         struct in6_addr in6;
 437
 438         if (size < sizeof(*data))
 439                 return -EINVAL;
 440         data = (struct nfsctl_fdparm*)buf;
 441         err = -EPROTONOSUPPORT;
 442         if (data->gd_addr.sa_family != AF_INET)
 443                 goto out;
 444         err = -EINVAL;
 445         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 446                 goto out;
 447
 448         res = buf;
 449         sin = (struct sockaddr_in *)&data->gd_addr;
 450         exp_readlock();
 451
 452         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 453
 454         clp = auth_unix_lookup(&in6);
 455         if (!clp)
 456                 err = -EPERM;
 457         else {
 458                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 459                 auth_domain_put(clp);
 460         }
 461         exp_readunlock();
 462
 463         if (err == 0) {
 464                 memset(res,0, NFS_FHSIZE);
 465                 memcpy(res, &fh.fh_base, fh.fh_size);
 466                 err = NFS_FHSIZE;
 467         }
 468  out:
 469         return err;
 470 }
 471
 472 /**
 473  * write_unlock_ip - Release all locks used by a client
 474  *
 475  * Experimental.
 476  *
 477  * Input:
 478  *                      buf:    '\n'-terminated C string containing a
 479  *                              presentation format IPv4 address
 480  *                      size:   length of C string in @buf
 481  * Output:
 482  *      On success:     returns zero if all specified locks were released;
 483  *                      returns one if one or more locks were not released
 484  *      On error:       return code is negative errno value
 485  *
 486  * Note: Only AF_INET client addresses are passed in
 487  */
 488 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 489 {
 490         struct sockaddr_in sin = {
 491                 .sin_family     = AF_INET,
 492         };
 493         int b1, b2, b3, b4;
 494         char c;
 495         char *fo_path;
 496
 497         /* sanity check */
 498         if (size == 0)
 499                 return -EINVAL;
 500
 501         if (buf[size-1] != '\n')
 502                 return -EINVAL;
 503
 504         fo_path = buf;
 505         if (qword_get(&buf, fo_path, size) < 0)
 506                 return -EINVAL;
 507
 508         /* get ipv4 address */
 509         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 510                 return -EINVAL;
 511         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
 512                 return -EINVAL;
 513         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
 514
 515         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
 516 }
 517
 518 /**
 519  * write_unlock_fs - Release all locks on a local file system
 520  *
 521  * Experimental.
 522  *
 523  * Input:
 524  *                      buf:    '\n'-terminated C string containing the
 525  *                              absolute pathname of a local file system
 526  *                      size:   length of C string in @buf
 527  * Output:
 528  *      On success:     returns zero if all specified locks were released;
 529  *                      returns one if one or more locks were not released
 530  *      On error:       return code is negative errno value
 531  */
 532 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 533 {
 534         struct path path;
 535         char *fo_path;
 536         int error;
 537
 538         /* sanity check */
 539         if (size == 0)
 540                 return -EINVAL;
 541
 542         if (buf[size-1] != '\n')
 543                 return -EINVAL;
 544
 545         fo_path = buf;
 546         if (qword_get(&buf, fo_path, size) < 0)
 547                 return -EINVAL;
 548
 549         error = kern_path(fo_path, 0, &path);
 550         if (error)
 551                 return error;
 552
 553         /*
 554          * XXX: Needs better sanity checking.  Otherwise we could end up
 555          * releasing locks on the wrong file system.
 556          *
 557          * For example:
 558          * 1.  Does the path refer to a directory?
 559          * 2.  Is that directory a mount point, or
 560          * 3.  Is that directory the root of an exported file system?
 561          */
 562         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 563
 564         path_put(&path);
 565         return error;
 566 }
 567
 568 /**
 569  * write_filehandle - Get a variable-length NFS file handle by path
 570  *
 571  * On input, the buffer contains a '\n'-terminated C string comprised of
 572  * three alphanumeric words separated by whitespace.  The string may
 573  * contain escape sequences.
 574  *
 575  * Input:
 576  *                      buf:
 577  *                              domain:         client domain name
 578  *                              path:           export pathname
 579  *                              maxsize:        numeric maximum size of
 580  *                                              @buf
 581  *                      size:   length of C string in @buf
 582  * Output:
 583  *      On success:     passed-in buffer filled with '\n'-terminated C
 584  *                      string containing a ASCII hex text version
 585  *                      of the NFS file handle;
 586  *                      return code is the size in bytes of the string
 587  *      On error:       return code is negative errno value
 588  */
 589 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 590 {
 591         char *dname, *path;
 592         int uninitialized_var(maxsize);
 593         char *mesg = buf;
 594         int len;
 595         struct auth_domain *dom;
 596         struct knfsd_fh fh;
 597
 598         if (size == 0)
 599                 return -EINVAL;
 600
 601         if (buf[size-1] != '\n')
 602                 return -EINVAL;
 603         buf[size-1] = 0;
 604
 605         dname = mesg;
 606         len = qword_get(&mesg, dname, size);
 607         if (len <= 0)
 608                 return -EINVAL;
 609
 610         path = dname+len+1;
 611         len = qword_get(&mesg, path, size);
 612         if (len <= 0)
 613                 return -EINVAL;
 614
 615         len = get_int(&mesg, &maxsize);
 616         if (len)
 617                 return len;
 618
 619         if (maxsize < NFS_FHSIZE)
 620                 return -EINVAL;
 621         if (maxsize > NFS3_FHSIZE)
 622                 maxsize = NFS3_FHSIZE;
 623
 624         if (qword_get(&mesg, mesg, size)>0)
 625                 return -EINVAL;
 626
 627         /* we have all the words, they are in buf.. */
 628         dom = unix_domain_find(dname);
 629         if (!dom)
 630                 return -ENOMEM;
 631
 632         len = exp_rootfh(dom, path, &fh,  maxsize);
 633         auth_domain_put(dom);
 634         if (len)
 635                 return len;
 636
 637         mesg = buf;
 638         len = SIMPLE_TRANSACTION_LIMIT;
 639         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 640         mesg[-1] = '\n';
 641         return mesg - buf;
 642 }
 643
 644 /**
 645  * write_threads - Start NFSD, or report the current number of running threads
 646  *
 647  * Input:
 648  *                      buf:            ignored
 649  *                      size:           zero
 650  * Output:
 651  *      On success:     passed-in buffer filled with '\n'-terminated C
 652  *                      string numeric value representing the number of
 653  *                      running NFSD threads;
 654  *                      return code is the size in bytes of the string
 655  *      On error:       return code is zero
 656  *
 657  * OR
 658  *
 659  * Input:
 660  *                      buf:            C string containing an unsigned
 661  *                                      integer value representing the
 662  *                                      number of NFSD threads to start
 663  *                      size:           non-zero length of C string in @buf
 664  * Output:
 665  *      On success:     NFS service is started;
 666  *                      passed-in buffer filled with '\n'-terminated C
 667  *                      string numeric value representing the number of
 668  *                      running NFSD threads;
 669  *                      return code is the size in bytes of the string
 670  *      On error:       return code is zero or a negative errno value
 671  */
 672 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 673 {
 674         char *mesg = buf;
 675         int rv;
 676         if (size > 0) {
 677                 int newthreads;
 678                 rv = get_int(&mesg, &newthreads);
 679                 if (rv)
 680                         return rv;
 681                 if (newthreads < 0)
 682                         return -EINVAL;
 683                 rv = nfsd_svc(NFS_PORT, newthreads);
 684                 if (rv)
 685                         return rv;
 686         }
 687         sprintf(buf, "%d\n", nfsd_nrthreads());
 688         return strlen(buf);
 689 }
 690
 691 /**
 692  * write_pool_threads - Set or report the current number of threads per pool
 693  *
 694  * Input:
 695  *                      buf:            ignored
 696  *                      size:           zero
 697  *
 698  * OR
 699  *
 700  * Input:
 701  *                      buf:            C string containing whitespace-
 702  *                                      separated unsigned integer values
 703  *                                      representing the number of NFSD
 704  *                                      threads to start in each pool
 705  *                      size:           non-zero length of C string in @buf
 706  * Output:
 707  *      On success:     passed-in buffer filled with '\n'-terminated C
 708  *                      string containing integer values representing the
 709  *                      number of NFSD threads in each pool;
 710  *                      return code is the size in bytes of the string
 711  *      On error:       return code is zero or a negative errno value
 712  */
 713 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 714 {
 715         /* if size > 0, look for an array of number of threads per node
 716          * and apply them  then write out number of threads per node as reply
 717          */
 718         char *mesg = buf;
 719         int i;
 720         int rv;
 721         int len;
 722         int npools;
 723         int *nthreads;
 724
 725         mutex_lock(&nfsd_mutex);
 726         npools = nfsd_nrpools();
 727         if (npools == 0) {
 728                 /*
 729                  * NFS is shut down.  The admin can start it by
 730                  * writing to the threads file but NOT the pool_threads
 731                  * file, sorry.  Report zero threads.
 732                  */
 733                 mutex_unlock(&nfsd_mutex);
 734                 strcpy(buf, "0\n");
 735                 return strlen(buf);
 736         }
 737
 738         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 739         rv = -ENOMEM;
 740         if (nthreads == NULL)
 741                 goto out_free;
 742
 743         if (size > 0) {
 744                 for (i = 0; i < npools; i++) {
 745                         rv = get_int(&mesg, &nthreads[i]);
 746                         if (rv == -ENOENT)
 747                                 break;          /* fewer numbers than pools */
 748                         if (rv)
 749                                 goto out_free;  /* syntax error */
 750                         rv = -EINVAL;
 751                         if (nthreads[i] < 0)
 752                                 goto out_free;
 753                 }
 754                 rv = nfsd_set_nrthreads(i, nthreads);
 755                 if (rv)
 756                         goto out_free;
 757         }
 758
 759         rv = nfsd_get_nrthreads(npools, nthreads);
 760         if (rv)
 761                 goto out_free;
 762
 763         mesg = buf;
 764         size = SIMPLE_TRANSACTION_LIMIT;
 765         for (i = 0; i < npools && size > 0; i++) {
 766                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 767                 len = strlen(mesg);
 768                 size -= len;
 769                 mesg += len;
 770         }
 771
 772         mutex_unlock(&nfsd_mutex);
 773         return (mesg-buf);
 774
 775 out_free:
 776         kfree(nthreads);
 777         mutex_unlock(&nfsd_mutex);
 778         return rv;
 779 }
 780
 781 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 782 {
 783         char *mesg = buf;
 784         char *vers, sign;
 785         int len, num;
 786         ssize_t tlen = 0;
 787         char *sep;
 788
 789         if (size>0) {
 790                 if (nfsd_serv)
 791                         /* Cannot change versions without updating
 792                          * nfsd_serv->sv_xdrsize, and reallocing
 793                          * rq_argp and rq_resp
 794                          */
 795                         return -EBUSY;
 796                 if (buf[size-1] != '\n')
 797                         return -EINVAL;
 798                 buf[size-1] = 0;
 799
 800                 vers = mesg;
 801                 len = qword_get(&mesg, vers, size);
 802                 if (len <= 0) return -EINVAL;
 803                 do {
 804                         sign = *vers;
 805                         if (sign == '+' || sign == '-')
 806                                 num = simple_strtol((vers+1), NULL, 0);
 807                         else
 808                                 num = simple_strtol(vers, NULL, 0);
 809                         switch(num) {
 810                         case 2:
 811                         case 3:
 812                         case 4:
 813                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 814                                 break;
 815                         default:
 816                                 return -EINVAL;
 817                         }
 818                         vers += len + 1;
 819                         tlen += len;
 820                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 821                 /* If all get turned off, turn them back on, as
 822                  * having no versions is BAD
 823                  */
 824                 nfsd_reset_versions();
 825         }
 826         /* Now write current state into reply buffer */
 827         len = 0;
 828         sep = "";
 829         for (num=2 ; num <= 4 ; num++)
 830                 if (nfsd_vers(num, NFSD_AVAIL)) {
 831                         len += sprintf(buf+len, "%s%c%d", sep,
 832                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 833                                        num);
 834                         sep = " ";
 835                 }
 836         len += sprintf(buf+len, "\n");
 837         return len;
 838 }
 839
 840 /**
 841  * write_versions - Set or report the available NFS protocol versions
 842  *
 843  * Input:
 844  *                      buf:            ignored
 845  *                      size:           zero
 846  * Output:
 847  *      On success:     passed-in buffer filled with '\n'-terminated C
 848  *                      string containing positive or negative integer
 849  *                      values representing the current status of each
 850  *                      protocol version;
 851  *                      return code is the size in bytes of the string
 852  *      On error:       return code is zero or a negative errno value
 853  *
 854  * OR
 855  *
 856  * Input:
 857  *                      buf:            C string containing whitespace-
 858  *                                      separated positive or negative
 859  *                                      integer values representing NFS
 860  *                                      protocol versions to enable ("+n")
 861  *                                      or disable ("-n")
 862  *                      size:           non-zero length of C string in @buf
 863  * Output:
 864  *      On success:     status of zero or more protocol versions has
 865  *                      been updated; passed-in buffer filled with
 866  *                      '\n'-terminated C string containing positive
 867  *                      or negative integer values representing the
 868  *                      current status of each protocol version;
 869  *                      return code is the size in bytes of the string
 870  *      On error:       return code is zero or a negative errno value
 871  */
 872 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 873 {
 874         ssize_t rv;
 875
 876         mutex_lock(&nfsd_mutex);
 877         rv = __write_versions(file, buf, size);
 878         mutex_unlock(&nfsd_mutex);
 879         return rv;
 880 }
 881
 882 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 883 {
 884         if (size == 0) {
 885                 int len = 0;
 886
 887                 if (nfsd_serv)
 888                         len = svc_xprt_names(nfsd_serv, buf, 0);
 889                 return len;
 890         }
 891         /* Either a single 'fd' number is written, in which
 892          * case it must be for a socket of a supported family/protocol,
 893          * and we use it as an nfsd socket, or
 894          * A '-' followed by the 'name' of a socket in which case
 895          * we close the socket.
 896          */
 897         if (isdigit(buf[0])) {
 898                 char *mesg = buf;
 899                 int fd;
 900                 int err;
 901                 err = get_int(&mesg, &fd);
 902                 if (err)
 903                         return -EINVAL;
 904                 if (fd < 0)
 905                         return -EINVAL;
 906                 err = nfsd_create_serv();
 907                 if (!err) {
 908                         err = svc_addsock(nfsd_serv, fd, buf);
 909                         if (err >= 0) {
 910                                 err = lockd_up();
 911                                 if (err < 0)
 912                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 913                         }
 914                         /* Decrease the count, but don't shutdown the
 915                          * the service
 916                          */
 917                         nfsd_serv->sv_nrthreads--;
 918                 }
 919                 return err < 0 ? err : 0;
 920         }
 921         if (buf[0] == '-' && isdigit(buf[1])) {
 922                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 923                 int len = 0;
 924                 if (!toclose)
 925                         return -ENOMEM;
 926                 if (nfsd_serv)
 927                         len = svc_sock_names(buf, nfsd_serv, toclose);
 928                 if (len >= 0)
 929                         lockd_down();
 930                 kfree(toclose);
 931                 return len;
 932         }
 933         /*
 934          * Add a transport listener by writing it's transport name
 935          */
 936         if (isalpha(buf[0])) {
 937                 int err;
 938                 char transport[16];
 939                 int port;
 940                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 941                         err = nfsd_create_serv();
 942                         if (!err) {
 943                                 err = svc_create_xprt(nfsd_serv,
 944                                                       transport, port,
 945                                                       SVC_SOCK_ANONYMOUS);
 946                                 if (err == -ENOENT)
 947                                         /* Give a reasonable perror msg for
 948                                          * bad transport string */
 949                                         err = -EPROTONOSUPPORT;
 950                         }
 951                         return err < 0 ? err : 0;
 952                 }
 953         }
 954         /*
 955          * Remove a transport by writing it's transport name and port number
 956          */
 957         if (buf[0] == '-' && isalpha(buf[1])) {
 958                 struct svc_xprt *xprt;
 959                 int err = -EINVAL;
 960                 char transport[16];
 961                 int port;
 962                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 963                         if (port == 0)
 964                                 return -EINVAL;
 965                         if (nfsd_serv) {
 966                                 xprt = svc_find_xprt(nfsd_serv, transport,
 967                                                      AF_UNSPEC, port);
 968                                 if (xprt) {
 969                                         svc_close_xprt(xprt);
 970                                         svc_xprt_put(xprt);
 971                                         err = 0;
 972                                 } else
 973                                         err = -ENOTCONN;
 974                         }
 975                         return err < 0 ? err : 0;
 976                 }
 977         }
 978         return -EINVAL;
 979 }
 980
 981 /**
 982  * write_ports - Pass a socket file descriptor or transport name to listen on
 983  *
 984  * Input:
 985  *                      buf:            ignored
 986  *                      size:           zero
 987  * Output:
 988  *      On success:     passed-in buffer filled with a '\n'-terminated C
 989  *                      string containing a whitespace-separated list of
 990  *                      named NFSD listeners;
 991  *                      return code is the size in bytes of the string
 992  *      On error:       return code is zero or a negative errno value
 993  *
 994  * OR
 995  *
 996  * Input:
 997  *                      buf:            C string containing an unsigned
 998  *                                      integer value representing a bound
 999  *                                      but unconnected socket that is to be
1000  *                                      used as an NFSD listener
1001  *                      size:           non-zero length of C string in @buf
1002  * Output:
1003  *      On success:     NFS service is started;
1004  *                      passed-in buffer filled with a '\n'-terminated C
1005  *                      string containing a unique alphanumeric name of
1006  *                      the listener;
1007  *                      return code is the size in bytes of the string
1008  *      On error:       return code is a negative errno value
1009  *
1010  * OR
1011  *
1012  * Input:
1013  *                      buf:            C string containing a "-" followed
1014  *                                      by an integer value representing a
1015  *                                      previously passed in socket file
1016  *                                      descriptor
1017  *                      size:           non-zero length of C string in @buf
1018  * Output:
1019  *      On success:     NFS service no longer listens on that socket;
1020  *                      passed-in buffer filled with a '\n'-terminated C
1021  *                      string containing a unique name of the listener;
1022  *                      return code is the size in bytes of the string
1023  *      On error:       return code is a negative errno value
1024  *
1025  * OR
1026  *
1027  * Input:
1028  *                      buf:            C string containing a transport
1029  *                                      name and an unsigned integer value
1030  *                                      representing the port to listen on,
1031  *                                      separated by whitespace
1032  *                      size:           non-zero length of C string in @buf
1033  * Output:
1034  *      On success:     returns zero; NFS service is started
1035  *      On error:       return code is a negative errno value
1036  *
1037  * OR
1038  *
1039  * Input:
1040  *                      buf:            C string containing a "-" followed
1041  *                                      by a transport name and an unsigned
1042  *                                      integer value representing the port
1043  *                                      to listen on, separated by whitespace
1044  *                      size:           non-zero length of C string in @buf
1045  * Output:
1046  *      On success:     returns zero; NFS service no longer listens
1047  *                      on that transport
1048  *      On error:       return code is a negative errno value
1049  */
1050 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1051 {
1052         ssize_t rv;
1053
1054         mutex_lock(&nfsd_mutex);
1055         rv = __write_ports(file, buf, size);
1056         mutex_unlock(&nfsd_mutex);
1057         return rv;
1058 }
1059
1060
1061 int nfsd_max_blksize;
1062
1063 /**
1064  * write_maxblksize - Set or report the current NFS blksize
1065  *
1066  * Input:
1067  *                      buf:            ignored
1068  *                      size:           zero
1069  *
1070  * OR
1071  *
1072  * Input:
1073  *                      buf:            C string containing an unsigned
1074  *                                      integer value representing the new
1075  *                                      NFS blksize
1076  *                      size:           non-zero length of C string in @buf
1077  * Output:
1078  *      On success:     passed-in buffer filled with '\n'-terminated C string
1079  *                      containing numeric value of the current NFS blksize
1080  *                      setting;
1081  *                      return code is the size in bytes of the string
1082  *      On error:       return code is zero or a negative errno value
1083  */
1084 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1085 {
1086         char *mesg = buf;
1087         if (size > 0) {
1088                 int bsize;
1089                 int rv = get_int(&mesg, &bsize);
1090                 if (rv)
1091                         return rv;
1092                 /* force bsize into allowed range and
1093                  * required alignment.
1094                  */
1095                 if (bsize < 1024)
1096                         bsize = 1024;
1097                 if (bsize > NFSSVC_MAXBLKSIZE)
1098                         bsize = NFSSVC_MAXBLKSIZE;
1099                 bsize &= ~(1024-1);
1100                 mutex_lock(&nfsd_mutex);
1101                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1102                         mutex_unlock(&nfsd_mutex);
1103                         return -EBUSY;
1104                 }
1105                 nfsd_max_blksize = bsize;
1106                 mutex_unlock(&nfsd_mutex);
1107         }
1108         return sprintf(buf, "%d\n", nfsd_max_blksize);
1109 }
1110
1111 #ifdef CONFIG_NFSD_V4
1112 extern time_t nfs4_leasetime(void);
1113
1114 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1115 {
1116         /* if size > 10 seconds, call
1117          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1118          */
1119         char *mesg = buf;
1120         int rv, lease;
1121
1122         if (size > 0) {
1123                 if (nfsd_serv)
1124                         return -EBUSY;
1125                 rv = get_int(&mesg, &lease);
1126                 if (rv)
1127                         return rv;
1128                 if (lease < 10 || lease > 3600)
1129                         return -EINVAL;
1130                 nfs4_reset_lease(lease);
1131         }
1132         sprintf(buf, "%ld\n", nfs4_lease_time());
1133         return strlen(buf);
1134 }
1135
1136 /**
1137  * write_leasetime - Set or report the current NFSv4 lease time
1138  *
1139  * Input:
1140  *                      buf:            ignored
1141  *                      size:           zero
1142  *
1143  * OR
1144  *
1145  * Input:
1146  *                      buf:            C string containing an unsigned
1147  *                                      integer value representing the new
1148  *                                      NFSv4 lease expiry time
1149  *                      size:           non-zero length of C string in @buf
1150  * Output:
1151  *      On success:     passed-in buffer filled with '\n'-terminated C
1152  *                      string containing unsigned integer value of the
1153  *                      current lease expiry time;
1154  *                      return code is the size in bytes of the string
1155  *      On error:       return code is zero or a negative errno value
1156  */
1157 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1158 {
1159         ssize_t rv;
1160
1161         mutex_lock(&nfsd_mutex);
1162         rv = __write_leasetime(file, buf, size);
1163         mutex_unlock(&nfsd_mutex);
1164         return rv;
1165 }
1166
1167 extern char *nfs4_recoverydir(void);
1168
1169 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1170 {
1171         char *mesg = buf;
1172         char *recdir;
1173         int len, status;
1174
1175         if (size > 0) {
1176                 if (nfsd_serv)
1177                         return -EBUSY;
1178                 if (size > PATH_MAX || buf[size-1] != '\n')
1179                         return -EINVAL;
1180                 buf[size-1] = 0;
1181
1182                 recdir = mesg;
1183                 len = qword_get(&mesg, recdir, size);
1184                 if (len <= 0)
1185                         return -EINVAL;
1186
1187                 status = nfs4_reset_recoverydir(recdir);
1188         }
1189         sprintf(buf, "%s\n", nfs4_recoverydir());
1190         return strlen(buf);
1191 }
1192
1193 /**
1194  * write_recoverydir - Set or report the pathname of the recovery directory
1195  *
1196  * Input:
1197  *                      buf:            ignored
1198  *                      size:           zero
1199  *
1200  * OR
1201  *
1202  * Input:
1203  *                      buf:            C string containing the pathname
1204  *                                      of the directory on a local file
1205  *                                      system containing permanent NFSv4
1206  *                                      recovery data
1207  *                      size:           non-zero length of C string in @buf
1208  * Output:
1209  *      On success:     passed-in buffer filled with '\n'-terminated C string
1210  *                      containing the current recovery pathname setting;
1211  *                      return code is the size in bytes of the string
1212  *      On error:       return code is zero or a negative errno value
1213  */
1214 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1215 {
1216         ssize_t rv;
1217
1218         mutex_lock(&nfsd_mutex);
1219         rv = __write_recoverydir(file, buf, size);
1220         mutex_unlock(&nfsd_mutex);
1221         return rv;
1222 }
1223
1224 #endif
1225
1226 /*----------------------------------------------------------------------------*/
1227 /*
1228  *      populating the filesystem.
1229  */
1230
1231 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1232 {
1233         static struct tree_descr nfsd_files[] = {
1234                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1235                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1236                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1237                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1238                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1239                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1240                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1241                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1242                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1243                                         &transaction_ops, S_IWUSR|S_IRUSR},
1244                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1245                                         &transaction_ops, S_IWUSR|S_IRUSR},
1246                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1247                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1248                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1249                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1250                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1251                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1252 #ifdef CONFIG_NFSD_V4
1253                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1254                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1255 #endif
1256                 /* last one */ {""}
1257         };
1258         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1259 }
1260
1261 static int nfsd_get_sb(struct file_system_type *fs_type,
1262         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1263 {
1264         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1265 }
1266
1267 static struct file_system_type nfsd_fs_type = {
1268         .owner          = THIS_MODULE,
1269         .name           = "nfsd",
1270         .get_sb         = nfsd_get_sb,
1271         .kill_sb        = kill_litter_super,
1272 };
1273
1274 #ifdef CONFIG_PROC_FS
1275 static int create_proc_exports_entry(void)
1276 {
1277         struct proc_dir_entry *entry;
1278
1279         entry = proc_mkdir("fs/nfs", NULL);
1280         if (!entry)
1281                 return -ENOMEM;
1282         entry = proc_create("exports", 0, entry, &exports_operations);
1283         if (!entry)
1284                 return -ENOMEM;
1285         return 0;
1286 }
1287 #else /* CONFIG_PROC_FS */
1288 static int create_proc_exports_entry(void)
1289 {
1290         return 0;
1291 }
1292 #endif
1293
1294 static int __init init_nfsd(void)
1295 {
1296         int retval;
1297         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1298
1299         retval = nfs4_state_init(); /* nfs4 locking state */
1300         if (retval)
1301                 return retval;
1302         nfsd_stat_init();       /* Statistics */
1303         retval = nfsd_reply_cache_init();
1304         if (retval)
1305                 goto out_free_stat;
1306         retval = nfsd_export_init();
1307         if (retval)
1308                 goto out_free_cache;
1309         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1310         retval = nfsd_idmap_init();
1311         if (retval)
1312                 goto out_free_lockd;
1313         retval = create_proc_exports_entry();
1314         if (retval)
1315                 goto out_free_idmap;
1316         retval = register_filesystem(&nfsd_fs_type);
1317         if (retval)
1318                 goto out_free_all;
1319         return 0;
1320 out_free_all:
1321         remove_proc_entry("fs/nfs/exports", NULL);
1322         remove_proc_entry("fs/nfs", NULL);
1323 out_free_idmap:
1324         nfsd_idmap_shutdown();
1325 out_free_lockd:
1326         nfsd_lockd_shutdown();
1327         nfsd_export_shutdown();
1328 out_free_cache:
1329         nfsd_reply_cache_shutdown();
1330 out_free_stat:
1331         nfsd_stat_shutdown();
1332         nfsd4_free_slabs();
1333         return retval;
1334 }
1335
1336 static void __exit exit_nfsd(void)
1337 {
1338         nfsd_export_shutdown();
1339         nfsd_reply_cache_shutdown();
1340         remove_proc_entry("fs/nfs/exports", NULL);
1341         remove_proc_entry("fs/nfs", NULL);
1342         nfsd_stat_shutdown();
1343         nfsd_lockd_shutdown();
1344         nfsd_idmap_shutdown();
1345         nfsd4_free_slabs();
1346         unregister_filesystem(&nfsd_fs_type);
1347 }
1348
1349 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1350 MODULE_LICENSE("GPL");
1351 module_init(init_nfsd)
1352 module_exit(exit_nfsd)