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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_Pool_Stats,
  64         NFSD_Versions,
  65         NFSD_Ports,
  66         NFSD_MaxBlkSize,
  67         /*
  68          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  69          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  70          */
  71 #ifdef CONFIG_NFSD_V4
  72         NFSD_Leasetime,
  73         NFSD_RecoveryDir,
  74 #endif
  75 };
  76
  77 /*
  78  * write() for these nodes.
  79  */
  80 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  81 static ssize_t write_add(struct file *file, char *buf, size_t size);
  82 static ssize_t write_del(struct file *file, char *buf, size_t size);
  83 static ssize_t write_export(struct file *file, char *buf, size_t size);
  84 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  85 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  86 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  87 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  88 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  89 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  90 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  91 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  92 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  93 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  94 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  95 #ifdef CONFIG_NFSD_V4
  96 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  97 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  98 #endif
  99
 100 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 101         [NFSD_Svc] = write_svc,
 102         [NFSD_Add] = write_add,
 103         [NFSD_Del] = write_del,
 104         [NFSD_Export] = write_export,
 105         [NFSD_Unexport] = write_unexport,
 106         [NFSD_Getfd] = write_getfd,
 107         [NFSD_Getfs] = write_getfs,
 108         [NFSD_Fh] = write_filehandle,
 109         [NFSD_FO_UnlockIP] = write_unlock_ip,
 110         [NFSD_FO_UnlockFS] = write_unlock_fs,
 111         [NFSD_Threads] = write_threads,
 112         [NFSD_Pool_Threads] = write_pool_threads,
 113         [NFSD_Versions] = write_versions,
 114         [NFSD_Ports] = write_ports,
 115         [NFSD_MaxBlkSize] = write_maxblksize,
 116 #ifdef CONFIG_NFSD_V4
 117         [NFSD_Leasetime] = write_leasetime,
 118         [NFSD_RecoveryDir] = write_recoverydir,
 119 #endif
 120 };
 121
 122 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 123 {
 124         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 125         char *data;
 126         ssize_t rv;
 127
 128         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 129                 return -EINVAL;
 130
 131         data = simple_transaction_get(file, buf, size);
 132         if (IS_ERR(data))
 133                 return PTR_ERR(data);
 134
 135         rv =  write_op[ino](file, data, size);
 136         if (rv >= 0) {
 137                 simple_transaction_set(file, rv);
 138                 rv = size;
 139         }
 140         return rv;
 141 }
 142
 143 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 144 {
 145         if (! file->private_data) {
 146                 /* An attempt to read a transaction file without writing
 147                  * causes a 0-byte write so that the file can return
 148                  * state information
 149                  */
 150                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 151                 if (rv < 0)
 152                         return rv;
 153         }
 154         return simple_transaction_read(file, buf, size, pos);
 155 }
 156
 157 static const struct file_operations transaction_ops = {
 158         .write          = nfsctl_transaction_write,
 159         .read           = nfsctl_transaction_read,
 160         .release        = simple_transaction_release,
 161 };
 162
 163 static int exports_open(struct inode *inode, struct file *file)
 164 {
 165         return seq_open(file, &nfs_exports_op);
 166 }
 167
 168 static const struct file_operations exports_operations = {
 169         .open           = exports_open,
 170         .read           = seq_read,
 171         .llseek         = seq_lseek,
 172         .release        = seq_release,
 173         .owner          = THIS_MODULE,
 174 };
 175
 176 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 177
 178 static struct file_operations pool_stats_operations = {
 179         .open           = nfsd_pool_stats_open,
 180         .read           = seq_read,
 181         .llseek         = seq_lseek,
 182         .release        = seq_release,
 183         .owner          = THIS_MODULE,
 184 };
 185
 186 /*----------------------------------------------------------------------------*/
 187 /*
 188  * payload - write methods
 189  */
 190
 191 /**
 192  * write_svc - Start kernel's NFSD server
 193  *
 194  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 195  * Function remains to support old versions of nfs-utils.
 196  *
 197  * Input:
 198  *                      buf:    struct nfsctl_svc
 199  *                              svc_port:       port number of this
 200  *                                              server's listener
 201  *                              svc_nthreads:   number of threads to start
 202  *                      size:   size in bytes of passed in nfsctl_svc
 203  * Output:
 204  *      On success:     returns zero
 205  *      On error:       return code is negative errno value
 206  */
 207 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 208 {
 209         struct nfsctl_svc *data;
 210         if (size < sizeof(*data))
 211                 return -EINVAL;
 212         data = (struct nfsctl_svc*) buf;
 213         return nfsd_svc(data->svc_port, data->svc_nthreads);
 214 }
 215
 216 /**
 217  * write_add - Add or modify client entry in auth unix cache
 218  *
 219  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 220  * Function remains to support old versions of nfs-utils.
 221  *
 222  * Input:
 223  *                      buf:    struct nfsctl_client
 224  *                              cl_ident:       '\0'-terminated C string
 225  *                                              containing domain name
 226  *                                              of client
 227  *                              cl_naddr:       no. of items in cl_addrlist
 228  *                              cl_addrlist:    array of client addresses
 229  *                              cl_fhkeytype:   ignored
 230  *                              cl_fhkeylen:    ignored
 231  *                              cl_fhkey:       ignored
 232  *                      size:   size in bytes of passed in nfsctl_client
 233  * Output:
 234  *      On success:     returns zero
 235  *      On error:       return code is negative errno value
 236  *
 237  * Note: Only AF_INET client addresses are passed in, since
 238  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 239  */
 240 static ssize_t write_add(struct file *file, char *buf, size_t size)
 241 {
 242         struct nfsctl_client *data;
 243         if (size < sizeof(*data))
 244                 return -EINVAL;
 245         data = (struct nfsctl_client *)buf;
 246         return exp_addclient(data);
 247 }
 248
 249 /**
 250  * write_del - Remove client from auth unix cache
 251  *
 252  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 253  * Function remains to support old versions of nfs-utils.
 254  *
 255  * Input:
 256  *                      buf:    struct nfsctl_client
 257  *                              cl_ident:       '\0'-terminated C string
 258  *                                              containing domain name
 259  *                                              of client
 260  *                              cl_naddr:       ignored
 261  *                              cl_addrlist:    ignored
 262  *                              cl_fhkeytype:   ignored
 263  *                              cl_fhkeylen:    ignored
 264  *                              cl_fhkey:       ignored
 265  *                      size:   size in bytes of passed in nfsctl_client
 266  * Output:
 267  *      On success:     returns zero
 268  *      On error:       return code is negative errno value
 269  *
 270  * Note: Only AF_INET client addresses are passed in, since
 271  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 272  */
 273 static ssize_t write_del(struct file *file, char *buf, size_t size)
 274 {
 275         struct nfsctl_client *data;
 276         if (size < sizeof(*data))
 277                 return -EINVAL;
 278         data = (struct nfsctl_client *)buf;
 279         return exp_delclient(data);
 280 }
 281
 282 /**
 283  * write_export - Export part or all of a local file system
 284  *
 285  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 286  * Function remains to support old versions of nfs-utils.
 287  *
 288  * Input:
 289  *                      buf:    struct nfsctl_export
 290  *                              ex_client:      '\0'-terminated C string
 291  *                                              containing domain name
 292  *                                              of client allowed to access
 293  *                                              this export
 294  *                              ex_path:        '\0'-terminated C string
 295  *                                              containing pathname of
 296  *                                              directory in local file system
 297  *                              ex_dev:         fsid to use for this export
 298  *                              ex_ino:         ignored
 299  *                              ex_flags:       export flags for this export
 300  *                              ex_anon_uid:    UID to use for anonymous
 301  *                                              requests
 302  *                              ex_anon_gid:    GID to use for anonymous
 303  *                                              requests
 304  *                      size:   size in bytes of passed in nfsctl_export
 305  * Output:
 306  *      On success:     returns zero
 307  *      On error:       return code is negative errno value
 308  */
 309 static ssize_t write_export(struct file *file, char *buf, size_t size)
 310 {
 311         struct nfsctl_export *data;
 312         if (size < sizeof(*data))
 313                 return -EINVAL;
 314         data = (struct nfsctl_export*)buf;
 315         return exp_export(data);
 316 }
 317
 318 /**
 319  * write_unexport - Unexport a previously exported file system
 320  *
 321  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 322  * Function remains to support old versions of nfs-utils.
 323  *
 324  * Input:
 325  *                      buf:    struct nfsctl_export
 326  *                              ex_client:      '\0'-terminated C string
 327  *                                              containing domain name
 328  *                                              of client no longer allowed
 329  *                                              to access this export
 330  *                              ex_path:        '\0'-terminated C string
 331  *                                              containing pathname of
 332  *                                              directory in local file system
 333  *                              ex_dev:         ignored
 334  *                              ex_ino:         ignored
 335  *                              ex_flags:       ignored
 336  *                              ex_anon_uid:    ignored
 337  *                              ex_anon_gid:    ignored
 338  *                      size:   size in bytes of passed in nfsctl_export
 339  * Output:
 340  *      On success:     returns zero
 341  *      On error:       return code is negative errno value
 342  */
 343 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 344 {
 345         struct nfsctl_export *data;
 346
 347         if (size < sizeof(*data))
 348                 return -EINVAL;
 349         data = (struct nfsctl_export*)buf;
 350         return exp_unexport(data);
 351 }
 352
 353 /**
 354  * write_getfs - Get a variable-length NFS file handle by path
 355  *
 356  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 357  * Function remains to support old versions of nfs-utils.
 358  *
 359  * Input:
 360  *                      buf:    struct nfsctl_fsparm
 361  *                              gd_addr:        socket address of client
 362  *                              gd_path:        '\0'-terminated C string
 363  *                                              containing pathname of
 364  *                                              directory in local file system
 365  *                              gd_maxlen:      maximum size of returned file
 366  *                                              handle
 367  *                      size:   size in bytes of passed in nfsctl_fsparm
 368  * Output:
 369  *      On success:     passed-in buffer filled with a knfsd_fh structure
 370  *                      (a variable-length raw NFS file handle);
 371  *                      return code is the size in bytes of the file handle
 372  *      On error:       return code is negative errno value
 373  *
 374  * Note: Only AF_INET client addresses are passed in, since gd_addr
 375  * is the same size as a struct sockaddr_in.
 376  */
 377 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 378 {
 379         struct nfsctl_fsparm *data;
 380         struct sockaddr_in *sin;
 381         struct auth_domain *clp;
 382         int err = 0;
 383         struct knfsd_fh *res;
 384         struct in6_addr in6;
 385
 386         if (size < sizeof(*data))
 387                 return -EINVAL;
 388         data = (struct nfsctl_fsparm*)buf;
 389         err = -EPROTONOSUPPORT;
 390         if (data->gd_addr.sa_family != AF_INET)
 391                 goto out;
 392         sin = (struct sockaddr_in *)&data->gd_addr;
 393         if (data->gd_maxlen > NFS3_FHSIZE)
 394                 data->gd_maxlen = NFS3_FHSIZE;
 395
 396         res = (struct knfsd_fh*)buf;
 397
 398         exp_readlock();
 399
 400         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 401
 402         clp = auth_unix_lookup(&in6);
 403         if (!clp)
 404                 err = -EPERM;
 405         else {
 406                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 407                 auth_domain_put(clp);
 408         }
 409         exp_readunlock();
 410         if (err == 0)
 411                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 412  out:
 413         return err;
 414 }
 415
 416 /**
 417  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 418  *
 419  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 420  * Function remains to support old versions of nfs-utils.
 421  *
 422  * Input:
 423  *                      buf:    struct nfsctl_fdparm
 424  *                              gd_addr:        socket address of client
 425  *                              gd_path:        '\0'-terminated C string
 426  *                                              containing pathname of
 427  *                                              directory in local file system
 428  *                              gd_version:     fdparm structure version
 429  *                      size:   size in bytes of passed in nfsctl_fdparm
 430  * Output:
 431  *      On success:     passed-in buffer filled with nfsctl_res
 432  *                      (a fixed-length raw NFS file handle);
 433  *                      return code is the size in bytes of the file handle
 434  *      On error:       return code is negative errno value
 435  *
 436  * Note: Only AF_INET client addresses are passed in, since gd_addr
 437  * is the same size as a struct sockaddr_in.
 438  */
 439 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 440 {
 441         struct nfsctl_fdparm *data;
 442         struct sockaddr_in *sin;
 443         struct auth_domain *clp;
 444         int err = 0;
 445         struct knfsd_fh fh;
 446         char *res;
 447         struct in6_addr in6;
 448
 449         if (size < sizeof(*data))
 450                 return -EINVAL;
 451         data = (struct nfsctl_fdparm*)buf;
 452         err = -EPROTONOSUPPORT;
 453         if (data->gd_addr.sa_family != AF_INET)
 454                 goto out;
 455         err = -EINVAL;
 456         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 457                 goto out;
 458
 459         res = buf;
 460         sin = (struct sockaddr_in *)&data->gd_addr;
 461         exp_readlock();
 462
 463         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 464
 465         clp = auth_unix_lookup(&in6);
 466         if (!clp)
 467                 err = -EPERM;
 468         else {
 469                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 470                 auth_domain_put(clp);
 471         }
 472         exp_readunlock();
 473
 474         if (err == 0) {
 475                 memset(res,0, NFS_FHSIZE);
 476                 memcpy(res, &fh.fh_base, fh.fh_size);
 477                 err = NFS_FHSIZE;
 478         }
 479  out:
 480         return err;
 481 }
 482
 483 /**
 484  * write_unlock_ip - Release all locks used by a client
 485  *
 486  * Experimental.
 487  *
 488  * Input:
 489  *                      buf:    '\n'-terminated C string containing a
 490  *                              presentation format IPv4 address
 491  *                      size:   length of C string in @buf
 492  * Output:
 493  *      On success:     returns zero if all specified locks were released;
 494  *                      returns one if one or more locks were not released
 495  *      On error:       return code is negative errno value
 496  *
 497  * Note: Only AF_INET client addresses are passed in
 498  */
 499 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 500 {
 501         struct sockaddr_in sin = {
 502                 .sin_family     = AF_INET,
 503         };
 504         int b1, b2, b3, b4;
 505         char c;
 506         char *fo_path;
 507
 508         /* sanity check */
 509         if (size == 0)
 510                 return -EINVAL;
 511
 512         if (buf[size-1] != '\n')
 513                 return -EINVAL;
 514
 515         fo_path = buf;
 516         if (qword_get(&buf, fo_path, size) < 0)
 517                 return -EINVAL;
 518
 519         /* get ipv4 address */
 520         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 521                 return -EINVAL;
 522         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
 523                 return -EINVAL;
 524         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
 525
 526         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
 527 }
 528
 529 /**
 530  * write_unlock_fs - Release all locks on a local file system
 531  *
 532  * Experimental.
 533  *
 534  * Input:
 535  *                      buf:    '\n'-terminated C string containing the
 536  *                              absolute pathname of a local file system
 537  *                      size:   length of C string in @buf
 538  * Output:
 539  *      On success:     returns zero if all specified locks were released;
 540  *                      returns one if one or more locks were not released
 541  *      On error:       return code is negative errno value
 542  */
 543 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 544 {
 545         struct path path;
 546         char *fo_path;
 547         int error;
 548
 549         /* sanity check */
 550         if (size == 0)
 551                 return -EINVAL;
 552
 553         if (buf[size-1] != '\n')
 554                 return -EINVAL;
 555
 556         fo_path = buf;
 557         if (qword_get(&buf, fo_path, size) < 0)
 558                 return -EINVAL;
 559
 560         error = kern_path(fo_path, 0, &path);
 561         if (error)
 562                 return error;
 563
 564         /*
 565          * XXX: Needs better sanity checking.  Otherwise we could end up
 566          * releasing locks on the wrong file system.
 567          *
 568          * For example:
 569          * 1.  Does the path refer to a directory?
 570          * 2.  Is that directory a mount point, or
 571          * 3.  Is that directory the root of an exported file system?
 572          */
 573         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 574
 575         path_put(&path);
 576         return error;
 577 }
 578
 579 /**
 580  * write_filehandle - Get a variable-length NFS file handle by path
 581  *
 582  * On input, the buffer contains a '\n'-terminated C string comprised of
 583  * three alphanumeric words separated by whitespace.  The string may
 584  * contain escape sequences.
 585  *
 586  * Input:
 587  *                      buf:
 588  *                              domain:         client domain name
 589  *                              path:           export pathname
 590  *                              maxsize:        numeric maximum size of
 591  *                                              @buf
 592  *                      size:   length of C string in @buf
 593  * Output:
 594  *      On success:     passed-in buffer filled with '\n'-terminated C
 595  *                      string containing a ASCII hex text version
 596  *                      of the NFS file handle;
 597  *                      return code is the size in bytes of the string
 598  *      On error:       return code is negative errno value
 599  */
 600 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 601 {
 602         char *dname, *path;
 603         int uninitialized_var(maxsize);
 604         char *mesg = buf;
 605         int len;
 606         struct auth_domain *dom;
 607         struct knfsd_fh fh;
 608
 609         if (size == 0)
 610                 return -EINVAL;
 611
 612         if (buf[size-1] != '\n')
 613                 return -EINVAL;
 614         buf[size-1] = 0;
 615
 616         dname = mesg;
 617         len = qword_get(&mesg, dname, size);
 618         if (len <= 0)
 619                 return -EINVAL;
 620
 621         path = dname+len+1;
 622         len = qword_get(&mesg, path, size);
 623         if (len <= 0)
 624                 return -EINVAL;
 625
 626         len = get_int(&mesg, &maxsize);
 627         if (len)
 628                 return len;
 629
 630         if (maxsize < NFS_FHSIZE)
 631                 return -EINVAL;
 632         if (maxsize > NFS3_FHSIZE)
 633                 maxsize = NFS3_FHSIZE;
 634
 635         if (qword_get(&mesg, mesg, size)>0)
 636                 return -EINVAL;
 637
 638         /* we have all the words, they are in buf.. */
 639         dom = unix_domain_find(dname);
 640         if (!dom)
 641                 return -ENOMEM;
 642
 643         len = exp_rootfh(dom, path, &fh,  maxsize);
 644         auth_domain_put(dom);
 645         if (len)
 646                 return len;
 647
 648         mesg = buf;
 649         len = SIMPLE_TRANSACTION_LIMIT;
 650         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 651         mesg[-1] = '\n';
 652         return mesg - buf;
 653 }
 654
 655 /**
 656  * write_threads - Start NFSD, or report the current number of running threads
 657  *
 658  * Input:
 659  *                      buf:            ignored
 660  *                      size:           zero
 661  * Output:
 662  *      On success:     passed-in buffer filled with '\n'-terminated C
 663  *                      string numeric value representing the number of
 664  *                      running NFSD threads;
 665  *                      return code is the size in bytes of the string
 666  *      On error:       return code is zero
 667  *
 668  * OR
 669  *
 670  * Input:
 671  *                      buf:            C string containing an unsigned
 672  *                                      integer value representing the
 673  *                                      number of NFSD threads to start
 674  *                      size:           non-zero length of C string in @buf
 675  * Output:
 676  *      On success:     NFS service is started;
 677  *                      passed-in buffer filled with '\n'-terminated C
 678  *                      string numeric value representing the number of
 679  *                      running NFSD threads;
 680  *                      return code is the size in bytes of the string
 681  *      On error:       return code is zero or a negative errno value
 682  */
 683 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 684 {
 685         char *mesg = buf;
 686         int rv;
 687         if (size > 0) {
 688                 int newthreads;
 689                 rv = get_int(&mesg, &newthreads);
 690                 if (rv)
 691                         return rv;
 692                 if (newthreads < 0)
 693                         return -EINVAL;
 694                 rv = nfsd_svc(NFS_PORT, newthreads);
 695                 if (rv)
 696                         return rv;
 697         }
 698         sprintf(buf, "%d\n", nfsd_nrthreads());
 699         return strlen(buf);
 700 }
 701
 702 /**
 703  * write_pool_threads - Set or report the current number of threads per pool
 704  *
 705  * Input:
 706  *                      buf:            ignored
 707  *                      size:           zero
 708  *
 709  * OR
 710  *
 711  * Input:
 712  *                      buf:            C string containing whitespace-
 713  *                                      separated unsigned integer values
 714  *                                      representing the number of NFSD
 715  *                                      threads to start in each pool
 716  *                      size:           non-zero length of C string in @buf
 717  * Output:
 718  *      On success:     passed-in buffer filled with '\n'-terminated C
 719  *                      string containing integer values representing the
 720  *                      number of NFSD threads in each pool;
 721  *                      return code is the size in bytes of the string
 722  *      On error:       return code is zero or a negative errno value
 723  */
 724 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 725 {
 726         /* if size > 0, look for an array of number of threads per node
 727          * and apply them  then write out number of threads per node as reply
 728          */
 729         char *mesg = buf;
 730         int i;
 731         int rv;
 732         int len;
 733         int npools;
 734         int *nthreads;
 735
 736         mutex_lock(&nfsd_mutex);
 737         npools = nfsd_nrpools();
 738         if (npools == 0) {
 739                 /*
 740                  * NFS is shut down.  The admin can start it by
 741                  * writing to the threads file but NOT the pool_threads
 742                  * file, sorry.  Report zero threads.
 743                  */
 744                 mutex_unlock(&nfsd_mutex);
 745                 strcpy(buf, "0\n");
 746                 return strlen(buf);
 747         }
 748
 749         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 750         rv = -ENOMEM;
 751         if (nthreads == NULL)
 752                 goto out_free;
 753
 754         if (size > 0) {
 755                 for (i = 0; i < npools; i++) {
 756                         rv = get_int(&mesg, &nthreads[i]);
 757                         if (rv == -ENOENT)
 758                                 break;          /* fewer numbers than pools */
 759                         if (rv)
 760                                 goto out_free;  /* syntax error */
 761                         rv = -EINVAL;
 762                         if (nthreads[i] < 0)
 763                                 goto out_free;
 764                 }
 765                 rv = nfsd_set_nrthreads(i, nthreads);
 766                 if (rv)
 767                         goto out_free;
 768         }
 769
 770         rv = nfsd_get_nrthreads(npools, nthreads);
 771         if (rv)
 772                 goto out_free;
 773
 774         mesg = buf;
 775         size = SIMPLE_TRANSACTION_LIMIT;
 776         for (i = 0; i < npools && size > 0; i++) {
 777                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 778                 len = strlen(mesg);
 779                 size -= len;
 780                 mesg += len;
 781         }
 782
 783         mutex_unlock(&nfsd_mutex);
 784         return (mesg-buf);
 785
 786 out_free:
 787         kfree(nthreads);
 788         mutex_unlock(&nfsd_mutex);
 789         return rv;
 790 }
 791
 792 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 793 {
 794         char *mesg = buf;
 795         char *vers, *minorp, sign;
 796         int len, num, remaining;
 797         unsigned minor;
 798         ssize_t tlen = 0;
 799         char *sep;
 800
 801         if (size>0) {
 802                 if (nfsd_serv)
 803                         /* Cannot change versions without updating
 804                          * nfsd_serv->sv_xdrsize, and reallocing
 805                          * rq_argp and rq_resp
 806                          */
 807                         return -EBUSY;
 808                 if (buf[size-1] != '\n')
 809                         return -EINVAL;
 810                 buf[size-1] = 0;
 811
 812                 vers = mesg;
 813                 len = qword_get(&mesg, vers, size);
 814                 if (len <= 0) return -EINVAL;
 815                 do {
 816                         sign = *vers;
 817                         if (sign == '+' || sign == '-')
 818                                 num = simple_strtol((vers+1), &minorp, 0);
 819                         else
 820                                 num = simple_strtol(vers, &minorp, 0);
 821                         if (*minorp == '.') {
 822                                 if (num < 4)
 823                                         return -EINVAL;
 824                                 minor = simple_strtoul(minorp+1, NULL, 0);
 825                                 if (minor == 0)
 826                                         return -EINVAL;
 827                                 if (nfsd_minorversion(minor, sign == '-' ?
 828                                                      NFSD_CLEAR : NFSD_SET) < 0)
 829                                         return -EINVAL;
 830                                 goto next;
 831                         }
 832                         switch(num) {
 833                         case 2:
 834                         case 3:
 835                         case 4:
 836                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 837                                 break;
 838                         default:
 839                                 return -EINVAL;
 840                         }
 841                 next:
 842                         vers += len + 1;
 843                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 844                 /* If all get turned off, turn them back on, as
 845                  * having no versions is BAD
 846                  */
 847                 nfsd_reset_versions();
 848         }
 849
 850         /* Now write current state into reply buffer */
 851         len = 0;
 852         sep = "";
 853         remaining = SIMPLE_TRANSACTION_LIMIT;
 854         for (num=2 ; num <= 4 ; num++)
 855                 if (nfsd_vers(num, NFSD_AVAIL)) {
 856                         len = snprintf(buf, remaining, "%s%c%d", sep,
 857                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 858                                        num);
 859                         sep = " ";
 860
 861                         if (len > remaining)
 862                                 break;
 863                         remaining -= len;
 864                         buf += len;
 865                         tlen += len;
 866                 }
 867         if (nfsd_vers(4, NFSD_AVAIL))
 868                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 869                      minor++) {
 870                         len = snprintf(buf, remaining, " %c4.%u",
 871                                         (nfsd_vers(4, NFSD_TEST) &&
 872                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 873                                                 '+' : '-',
 874                                         minor);
 875
 876                         if (len > remaining)
 877                                 break;
 878                         remaining -= len;
 879                         buf += len;
 880                         tlen += len;
 881                 }
 882
 883         len = snprintf(buf, remaining, "\n");
 884         if (len > remaining)
 885                 return -EINVAL;
 886         return tlen + len;
 887 }
 888
 889 /**
 890  * write_versions - Set or report the available NFS protocol versions
 891  *
 892  * Input:
 893  *                      buf:            ignored
 894  *                      size:           zero
 895  * Output:
 896  *      On success:     passed-in buffer filled with '\n'-terminated C
 897  *                      string containing positive or negative integer
 898  *                      values representing the current status of each
 899  *                      protocol version;
 900  *                      return code is the size in bytes of the string
 901  *      On error:       return code is zero or a negative errno value
 902  *
 903  * OR
 904  *
 905  * Input:
 906  *                      buf:            C string containing whitespace-
 907  *                                      separated positive or negative
 908  *                                      integer values representing NFS
 909  *                                      protocol versions to enable ("+n")
 910  *                                      or disable ("-n")
 911  *                      size:           non-zero length of C string in @buf
 912  * Output:
 913  *      On success:     status of zero or more protocol versions has
 914  *                      been updated; passed-in buffer filled with
 915  *                      '\n'-terminated C string containing positive
 916  *                      or negative integer values representing the
 917  *                      current status of each protocol version;
 918  *                      return code is the size in bytes of the string
 919  *      On error:       return code is zero or a negative errno value
 920  */
 921 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 922 {
 923         ssize_t rv;
 924
 925         mutex_lock(&nfsd_mutex);
 926         rv = __write_versions(file, buf, size);
 927         mutex_unlock(&nfsd_mutex);
 928         return rv;
 929 }
 930
 931 /*
 932  * Zero-length write.  Return a list of NFSD's current listener
 933  * transports.
 934  */
 935 static ssize_t __write_ports_names(char *buf)
 936 {
 937         if (nfsd_serv == NULL)
 938                 return 0;
 939         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 940 }
 941
 942 /*
 943  * A single 'fd' number was written, in which case it must be for
 944  * a socket of a supported family/protocol, and we use it as an
 945  * nfsd listener.
 946  */
 947 static ssize_t __write_ports_addfd(char *buf)
 948 {
 949         char *mesg = buf;
 950         int fd, err;
 951
 952         err = get_int(&mesg, &fd);
 953         if (err != 0 || fd < 0)
 954                 return -EINVAL;
 955
 956         err = nfsd_create_serv();
 957         if (err != 0)
 958                 return err;
 959
 960         err = lockd_up();
 961         if (err != 0)
 962                 goto out;
 963
 964         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 965         if (err < 0)
 966                 lockd_down();
 967
 968 out:
 969         /* Decrease the count, but don't shut down the service */
 970         nfsd_serv->sv_nrthreads--;
 971         return err;
 972 }
 973
 974 /*
 975  * A '-' followed by the 'name' of a socket means we close the socket.
 976  */
 977 static ssize_t __write_ports_delfd(char *buf)
 978 {
 979         char *toclose;
 980         int len = 0;
 981
 982         toclose = kstrdup(buf + 1, GFP_KERNEL);
 983         if (toclose == NULL)
 984                 return -ENOMEM;
 985
 986         if (nfsd_serv != NULL)
 987                 len = svc_sock_names(nfsd_serv, buf,
 988                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 989         if (len >= 0)
 990                 lockd_down();
 991
 992         kfree(toclose);
 993         return len;
 994 }
 995
 996 /*
 997  * A transport listener is added by writing it's transport name and
 998  * a port number.
 999  */
1000 static ssize_t __write_ports_addxprt(char *buf)
1001 {
1002         char transport[16];
1003         int port, err;
1004
1005         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1006                 return -EINVAL;
1007
1008         if (port < 1 || port > USHORT_MAX)
1009                 return -EINVAL;
1010
1011         err = nfsd_create_serv();
1012         if (err != 0)
1013                 return err;
1014
1015         err = svc_create_xprt(nfsd_serv, transport,
1016                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1017         if (err < 0) {
1018                 /* Give a reasonable perror msg for bad transport string */
1019                 if (err == -ENOENT)
1020                         err = -EPROTONOSUPPORT;
1021                 return err;
1022         }
1023         return 0;
1024 }
1025
1026 /*
1027  * A transport listener is removed by writing a "-", it's transport
1028  * name, and it's port number.
1029  */
1030 static ssize_t __write_ports_delxprt(char *buf)
1031 {
1032         struct svc_xprt *xprt;
1033         char transport[16];
1034         int port;
1035
1036         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1037                 return -EINVAL;
1038
1039         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1040                 return -EINVAL;
1041
1042         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1043         if (xprt == NULL)
1044                 return -ENOTCONN;
1045
1046         svc_close_xprt(xprt);
1047         svc_xprt_put(xprt);
1048         return 0;
1049 }
1050
1051 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1052 {
1053         if (size == 0)
1054                 return __write_ports_names(buf);
1055
1056         if (isdigit(buf[0]))
1057                 return __write_ports_addfd(buf);
1058
1059         if (buf[0] == '-' && isdigit(buf[1]))
1060                 return __write_ports_delfd(buf);
1061
1062         if (isalpha(buf[0]))
1063                 return __write_ports_addxprt(buf);
1064
1065         if (buf[0] == '-' && isalpha(buf[1]))
1066                 return __write_ports_delxprt(buf);
1067
1068         return -EINVAL;
1069 }
1070
1071 /**
1072  * write_ports - Pass a socket file descriptor or transport name to listen on
1073  *
1074  * Input:
1075  *                      buf:            ignored
1076  *                      size:           zero
1077  * Output:
1078  *      On success:     passed-in buffer filled with a '\n'-terminated C
1079  *                      string containing a whitespace-separated list of
1080  *                      named NFSD listeners;
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  * OR
1085  *
1086  * Input:
1087  *                      buf:            C string containing an unsigned
1088  *                                      integer value representing a bound
1089  *                                      but unconnected socket that is to be
1090  *                                      used as an NFSD listener; listen(3)
1091  *                                      must be called for a SOCK_STREAM
1092  *                                      socket, otherwise it is ignored
1093  *                      size:           non-zero length of C string in @buf
1094  * Output:
1095  *      On success:     NFS service is started;
1096  *                      passed-in buffer filled with a '\n'-terminated C
1097  *                      string containing a unique alphanumeric name of
1098  *                      the listener;
1099  *                      return code is the size in bytes of the string
1100  *      On error:       return code is a negative errno value
1101  *
1102  * OR
1103  *
1104  * Input:
1105  *                      buf:            C string containing a "-" followed
1106  *                                      by an integer value representing a
1107  *                                      previously passed in socket file
1108  *                                      descriptor
1109  *                      size:           non-zero length of C string in @buf
1110  * Output:
1111  *      On success:     NFS service no longer listens on that socket;
1112  *                      passed-in buffer filled with a '\n'-terminated C
1113  *                      string containing a unique name of the listener;
1114  *                      return code is the size in bytes of the string
1115  *      On error:       return code is a negative errno value
1116  *
1117  * OR
1118  *
1119  * Input:
1120  *                      buf:            C string containing a transport
1121  *                                      name and an unsigned integer value
1122  *                                      representing the port to listen on,
1123  *                                      separated by whitespace
1124  *                      size:           non-zero length of C string in @buf
1125  * Output:
1126  *      On success:     returns zero; NFS service is started
1127  *      On error:       return code is a negative errno value
1128  *
1129  * OR
1130  *
1131  * Input:
1132  *                      buf:            C string containing a "-" followed
1133  *                                      by a transport name and an unsigned
1134  *                                      integer value representing the port
1135  *                                      to listen on, separated by whitespace
1136  *                      size:           non-zero length of C string in @buf
1137  * Output:
1138  *      On success:     returns zero; NFS service no longer listens
1139  *                      on that transport
1140  *      On error:       return code is a negative errno value
1141  */
1142 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1143 {
1144         ssize_t rv;
1145
1146         mutex_lock(&nfsd_mutex);
1147         rv = __write_ports(file, buf, size);
1148         mutex_unlock(&nfsd_mutex);
1149         return rv;
1150 }
1151
1152
1153 int nfsd_max_blksize;
1154
1155 /**
1156  * write_maxblksize - Set or report the current NFS blksize
1157  *
1158  * Input:
1159  *                      buf:            ignored
1160  *                      size:           zero
1161  *
1162  * OR
1163  *
1164  * Input:
1165  *                      buf:            C string containing an unsigned
1166  *                                      integer value representing the new
1167  *                                      NFS blksize
1168  *                      size:           non-zero length of C string in @buf
1169  * Output:
1170  *      On success:     passed-in buffer filled with '\n'-terminated C string
1171  *                      containing numeric value of the current NFS blksize
1172  *                      setting;
1173  *                      return code is the size in bytes of the string
1174  *      On error:       return code is zero or a negative errno value
1175  */
1176 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1177 {
1178         char *mesg = buf;
1179         if (size > 0) {
1180                 int bsize;
1181                 int rv = get_int(&mesg, &bsize);
1182                 if (rv)
1183                         return rv;
1184                 /* force bsize into allowed range and
1185                  * required alignment.
1186                  */
1187                 if (bsize < 1024)
1188                         bsize = 1024;
1189                 if (bsize > NFSSVC_MAXBLKSIZE)
1190                         bsize = NFSSVC_MAXBLKSIZE;
1191                 bsize &= ~(1024-1);
1192                 mutex_lock(&nfsd_mutex);
1193                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1194                         mutex_unlock(&nfsd_mutex);
1195                         return -EBUSY;
1196                 }
1197                 nfsd_max_blksize = bsize;
1198                 mutex_unlock(&nfsd_mutex);
1199         }
1200         return sprintf(buf, "%d\n", nfsd_max_blksize);
1201 }
1202
1203 #ifdef CONFIG_NFSD_V4
1204 extern time_t nfs4_leasetime(void);
1205
1206 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1207 {
1208         /* if size > 10 seconds, call
1209          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1210          */
1211         char *mesg = buf;
1212         int rv, lease;
1213
1214         if (size > 0) {
1215                 if (nfsd_serv)
1216                         return -EBUSY;
1217                 rv = get_int(&mesg, &lease);
1218                 if (rv)
1219                         return rv;
1220                 if (lease < 10 || lease > 3600)
1221                         return -EINVAL;
1222                 nfs4_reset_lease(lease);
1223         }
1224         sprintf(buf, "%ld\n", nfs4_lease_time());
1225         return strlen(buf);
1226 }
1227
1228 /**
1229  * write_leasetime - Set or report the current NFSv4 lease time
1230  *
1231  * Input:
1232  *                      buf:            ignored
1233  *                      size:           zero
1234  *
1235  * OR
1236  *
1237  * Input:
1238  *                      buf:            C string containing an unsigned
1239  *                                      integer value representing the new
1240  *                                      NFSv4 lease expiry time
1241  *                      size:           non-zero length of C string in @buf
1242  * Output:
1243  *      On success:     passed-in buffer filled with '\n'-terminated C
1244  *                      string containing unsigned integer value of the
1245  *                      current lease expiry time;
1246  *                      return code is the size in bytes of the string
1247  *      On error:       return code is zero or a negative errno value
1248  */
1249 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1250 {
1251         ssize_t rv;
1252
1253         mutex_lock(&nfsd_mutex);
1254         rv = __write_leasetime(file, buf, size);
1255         mutex_unlock(&nfsd_mutex);
1256         return rv;
1257 }
1258
1259 extern char *nfs4_recoverydir(void);
1260
1261 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1262 {
1263         char *mesg = buf;
1264         char *recdir;
1265         int len, status;
1266
1267         if (size > 0) {
1268                 if (nfsd_serv)
1269                         return -EBUSY;
1270                 if (size > PATH_MAX || buf[size-1] != '\n')
1271                         return -EINVAL;
1272                 buf[size-1] = 0;
1273
1274                 recdir = mesg;
1275                 len = qword_get(&mesg, recdir, size);
1276                 if (len <= 0)
1277                         return -EINVAL;
1278
1279                 status = nfs4_reset_recoverydir(recdir);
1280         }
1281
1282         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1283                                                         nfs4_recoverydir());
1284 }
1285
1286 /**
1287  * write_recoverydir - Set or report the pathname of the recovery directory
1288  *
1289  * Input:
1290  *                      buf:            ignored
1291  *                      size:           zero
1292  *
1293  * OR
1294  *
1295  * Input:
1296  *                      buf:            C string containing the pathname
1297  *                                      of the directory on a local file
1298  *                                      system containing permanent NFSv4
1299  *                                      recovery data
1300  *                      size:           non-zero length of C string in @buf
1301  * Output:
1302  *      On success:     passed-in buffer filled with '\n'-terminated C string
1303  *                      containing the current recovery pathname setting;
1304  *                      return code is the size in bytes of the string
1305  *      On error:       return code is zero or a negative errno value
1306  */
1307 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1308 {
1309         ssize_t rv;
1310
1311         mutex_lock(&nfsd_mutex);
1312         rv = __write_recoverydir(file, buf, size);
1313         mutex_unlock(&nfsd_mutex);
1314         return rv;
1315 }
1316
1317 #endif
1318
1319 /*----------------------------------------------------------------------------*/
1320 /*
1321  *      populating the filesystem.
1322  */
1323
1324 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1325 {
1326         static struct tree_descr nfsd_files[] = {
1327                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1328                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1329                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1330                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1331                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1332                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1333                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1334                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1335                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1336                                         &transaction_ops, S_IWUSR|S_IRUSR},
1337                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1338                                         &transaction_ops, S_IWUSR|S_IRUSR},
1339                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1340                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1341                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1342                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1343                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1344                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1345                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1346 #ifdef CONFIG_NFSD_V4
1347                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1348                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1349 #endif
1350                 /* last one */ {""}
1351         };
1352         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1353 }
1354
1355 static int nfsd_get_sb(struct file_system_type *fs_type,
1356         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1357 {
1358         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1359 }
1360
1361 static struct file_system_type nfsd_fs_type = {
1362         .owner          = THIS_MODULE,
1363         .name           = "nfsd",
1364         .get_sb         = nfsd_get_sb,
1365         .kill_sb        = kill_litter_super,
1366 };
1367
1368 #ifdef CONFIG_PROC_FS
1369 static int create_proc_exports_entry(void)
1370 {
1371         struct proc_dir_entry *entry;
1372
1373         entry = proc_mkdir("fs/nfs", NULL);
1374         if (!entry)
1375                 return -ENOMEM;
1376         entry = proc_create("exports", 0, entry, &exports_operations);
1377         if (!entry)
1378                 return -ENOMEM;
1379         return 0;
1380 }
1381 #else /* CONFIG_PROC_FS */
1382 static int create_proc_exports_entry(void)
1383 {
1384         return 0;
1385 }
1386 #endif
1387
1388 static int __init init_nfsd(void)
1389 {
1390         int retval;
1391         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1392
1393         retval = nfs4_state_init(); /* nfs4 locking state */
1394         if (retval)
1395                 return retval;
1396         nfsd_stat_init();       /* Statistics */
1397         retval = nfsd_reply_cache_init();
1398         if (retval)
1399                 goto out_free_stat;
1400         retval = nfsd_export_init();
1401         if (retval)
1402                 goto out_free_cache;
1403         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1404         retval = nfsd_idmap_init();
1405         if (retval)
1406                 goto out_free_lockd;
1407         retval = create_proc_exports_entry();
1408         if (retval)
1409                 goto out_free_idmap;
1410         retval = register_filesystem(&nfsd_fs_type);
1411         if (retval)
1412                 goto out_free_all;
1413         return 0;
1414 out_free_all:
1415         remove_proc_entry("fs/nfs/exports", NULL);
1416         remove_proc_entry("fs/nfs", NULL);
1417 out_free_idmap:
1418         nfsd_idmap_shutdown();
1419 out_free_lockd:
1420         nfsd_lockd_shutdown();
1421         nfsd_export_shutdown();
1422 out_free_cache:
1423         nfsd_reply_cache_shutdown();
1424 out_free_stat:
1425         nfsd_stat_shutdown();
1426         nfsd4_free_slabs();
1427         return retval;
1428 }
1429
1430 static void __exit exit_nfsd(void)
1431 {
1432         nfsd_export_shutdown();
1433         nfsd_reply_cache_shutdown();
1434         remove_proc_entry("fs/nfs/exports", NULL);
1435         remove_proc_entry("fs/nfs", NULL);
1436         nfsd_stat_shutdown();
1437         nfsd_lockd_shutdown();
1438         nfsd_idmap_shutdown();
1439         nfsd4_free_slabs();
1440         unregister_filesystem(&nfsd_fs_type);
1441 }
1442
1443 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1444 MODULE_LICENSE("GPL");
1445 module_init(init_nfsd)
1446 module_exit(exit_nfsd)