fs/nfsd/nfsctl.c

   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/module.h>
  10
  11 #include <linux/linkage.h>
  12 #include <linux/time.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/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/ctype.h>
  29
  30 #include <linux/nfs.h>
  31 #include <linux/nfsd_idmap.h>
  32 #include <linux/lockd/bind.h>
  33 #include <linux/sunrpc/svc.h>
  34 #include <linux/sunrpc/svcsock.h>
  35 #include <linux/nfsd/nfsd.h>
  36 #include <linux/nfsd/cache.h>
  37 #include <linux/nfsd/xdr.h>
  38 #include <linux/nfsd/syscall.h>
  39 #include <linux/lockd/lockd.h>
  40
  41 #include <asm/uaccess.h>
  42 #include <net/ipv6.h>
  43
  44 /*
  45  *      We have a single directory with 9 nodes in it.
  46  */
  47 enum {
  48         NFSD_Root = 1,
  49         NFSD_Svc,
  50         NFSD_Add,
  51         NFSD_Del,
  52         NFSD_Export,
  53         NFSD_Unexport,
  54         NFSD_Getfd,
  55         NFSD_Getfs,
  56         NFSD_List,
  57         NFSD_Fh,
  58         NFSD_FO_UnlockIP,
  59         NFSD_FO_UnlockFS,
  60         NFSD_Threads,
  61         NFSD_Pool_Threads,
  62         NFSD_Pool_Stats,
  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 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 176
 177 static struct file_operations pool_stats_operations = {
 178         .open           = nfsd_pool_stats_open,
 179         .read           = seq_read,
 180         .llseek         = seq_lseek,
 181         .release        = seq_release,
 182         .owner          = THIS_MODULE,
 183 };
 184
 185 /*----------------------------------------------------------------------------*/
 186 /*
 187  * payload - write methods
 188  */
 189
 190 /**
 191  * write_svc - Start kernel's NFSD server
 192  *
 193  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 194  * Function remains to support old versions of nfs-utils.
 195  *
 196  * Input:
 197  *                      buf:    struct nfsctl_svc
 198  *                              svc_port:       port number of this
 199  *                                              server's listener
 200  *                              svc_nthreads:   number of threads to start
 201  *                      size:   size in bytes of passed in nfsctl_svc
 202  * Output:
 203  *      On success:     returns zero
 204  *      On error:       return code is negative errno value
 205  */
 206 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 207 {
 208         struct nfsctl_svc *data;
 209         int err;
 210         if (size < sizeof(*data))
 211                 return -EINVAL;
 212         data = (struct nfsctl_svc*) buf;
 213         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 214         if (err < 0)
 215                 return err;
 216         return 0;
 217 }
 218
 219 /**
 220  * write_add - Add or modify client entry in auth unix cache
 221  *
 222  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 223  * Function remains to support old versions of nfs-utils.
 224  *
 225  * Input:
 226  *                      buf:    struct nfsctl_client
 227  *                              cl_ident:       '\0'-terminated C string
 228  *                                              containing domain name
 229  *                                              of client
 230  *                              cl_naddr:       no. of items in cl_addrlist
 231  *                              cl_addrlist:    array of client addresses
 232  *                              cl_fhkeytype:   ignored
 233  *                              cl_fhkeylen:    ignored
 234  *                              cl_fhkey:       ignored
 235  *                      size:   size in bytes of passed in nfsctl_client
 236  * Output:
 237  *      On success:     returns zero
 238  *      On error:       return code is negative errno value
 239  *
 240  * Note: Only AF_INET client addresses are passed in, since
 241  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 242  */
 243 static ssize_t write_add(struct file *file, char *buf, size_t size)
 244 {
 245         struct nfsctl_client *data;
 246         if (size < sizeof(*data))
 247                 return -EINVAL;
 248         data = (struct nfsctl_client *)buf;
 249         return exp_addclient(data);
 250 }
 251
 252 /**
 253  * write_del - Remove client from auth unix cache
 254  *
 255  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 256  * Function remains to support old versions of nfs-utils.
 257  *
 258  * Input:
 259  *                      buf:    struct nfsctl_client
 260  *                              cl_ident:       '\0'-terminated C string
 261  *                                              containing domain name
 262  *                                              of client
 263  *                              cl_naddr:       ignored
 264  *                              cl_addrlist:    ignored
 265  *                              cl_fhkeytype:   ignored
 266  *                              cl_fhkeylen:    ignored
 267  *                              cl_fhkey:       ignored
 268  *                      size:   size in bytes of passed in nfsctl_client
 269  * Output:
 270  *      On success:     returns zero
 271  *      On error:       return code is negative errno value
 272  *
 273  * Note: Only AF_INET client addresses are passed in, since
 274  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 275  */
 276 static ssize_t write_del(struct file *file, char *buf, size_t size)
 277 {
 278         struct nfsctl_client *data;
 279         if (size < sizeof(*data))
 280                 return -EINVAL;
 281         data = (struct nfsctl_client *)buf;
 282         return exp_delclient(data);
 283 }
 284
 285 /**
 286  * write_export - Export part or all of a local file system
 287  *
 288  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 289  * Function remains to support old versions of nfs-utils.
 290  *
 291  * Input:
 292  *                      buf:    struct nfsctl_export
 293  *                              ex_client:      '\0'-terminated C string
 294  *                                              containing domain name
 295  *                                              of client allowed to access
 296  *                                              this export
 297  *                              ex_path:        '\0'-terminated C string
 298  *                                              containing pathname of
 299  *                                              directory in local file system
 300  *                              ex_dev:         fsid to use for this export
 301  *                              ex_ino:         ignored
 302  *                              ex_flags:       export flags for this export
 303  *                              ex_anon_uid:    UID to use for anonymous
 304  *                                              requests
 305  *                              ex_anon_gid:    GID to use for anonymous
 306  *                                              requests
 307  *                      size:   size in bytes of passed in nfsctl_export
 308  * Output:
 309  *      On success:     returns zero
 310  *      On error:       return code is negative errno value
 311  */
 312 static ssize_t write_export(struct file *file, char *buf, size_t size)
 313 {
 314         struct nfsctl_export *data;
 315         if (size < sizeof(*data))
 316                 return -EINVAL;
 317         data = (struct nfsctl_export*)buf;
 318         return exp_export(data);
 319 }
 320
 321 /**
 322  * write_unexport - Unexport a previously exported file system
 323  *
 324  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 325  * Function remains to support old versions of nfs-utils.
 326  *
 327  * Input:
 328  *                      buf:    struct nfsctl_export
 329  *                              ex_client:      '\0'-terminated C string
 330  *                                              containing domain name
 331  *                                              of client no longer allowed
 332  *                                              to access this export
 333  *                              ex_path:        '\0'-terminated C string
 334  *                                              containing pathname of
 335  *                                              directory in local file system
 336  *                              ex_dev:         ignored
 337  *                              ex_ino:         ignored
 338  *                              ex_flags:       ignored
 339  *                              ex_anon_uid:    ignored
 340  *                              ex_anon_gid:    ignored
 341  *                      size:   size in bytes of passed in nfsctl_export
 342  * Output:
 343  *      On success:     returns zero
 344  *      On error:       return code is negative errno value
 345  */
 346 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 347 {
 348         struct nfsctl_export *data;
 349
 350         if (size < sizeof(*data))
 351                 return -EINVAL;
 352         data = (struct nfsctl_export*)buf;
 353         return exp_unexport(data);
 354 }
 355
 356 /**
 357  * write_getfs - Get a variable-length NFS file handle by path
 358  *
 359  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 360  * Function remains to support old versions of nfs-utils.
 361  *
 362  * Input:
 363  *                      buf:    struct nfsctl_fsparm
 364  *                              gd_addr:        socket address of client
 365  *                              gd_path:        '\0'-terminated C string
 366  *                                              containing pathname of
 367  *                                              directory in local file system
 368  *                              gd_maxlen:      maximum size of returned file
 369  *                                              handle
 370  *                      size:   size in bytes of passed in nfsctl_fsparm
 371  * Output:
 372  *      On success:     passed-in buffer filled with a knfsd_fh structure
 373  *                      (a variable-length raw NFS file handle);
 374  *                      return code is the size in bytes of the file handle
 375  *      On error:       return code is negative errno value
 376  *
 377  * Note: Only AF_INET client addresses are passed in, since gd_addr
 378  * is the same size as a struct sockaddr_in.
 379  */
 380 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 381 {
 382         struct nfsctl_fsparm *data;
 383         struct sockaddr_in *sin;
 384         struct auth_domain *clp;
 385         int err = 0;
 386         struct knfsd_fh *res;
 387         struct in6_addr in6;
 388
 389         if (size < sizeof(*data))
 390                 return -EINVAL;
 391         data = (struct nfsctl_fsparm*)buf;
 392         err = -EPROTONOSUPPORT;
 393         if (data->gd_addr.sa_family != AF_INET)
 394                 goto out;
 395         sin = (struct sockaddr_in *)&data->gd_addr;
 396         if (data->gd_maxlen > NFS3_FHSIZE)
 397                 data->gd_maxlen = NFS3_FHSIZE;
 398
 399         res = (struct knfsd_fh*)buf;
 400
 401         exp_readlock();
 402
 403         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 404
 405         clp = auth_unix_lookup(&in6);
 406         if (!clp)
 407                 err = -EPERM;
 408         else {
 409                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 410                 auth_domain_put(clp);
 411         }
 412         exp_readunlock();
 413         if (err == 0)
 414                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 415  out:
 416         return err;
 417 }
 418
 419 /**
 420  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 421  *
 422  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 423  * Function remains to support old versions of nfs-utils.
 424  *
 425  * Input:
 426  *                      buf:    struct nfsctl_fdparm
 427  *                              gd_addr:        socket address of client
 428  *                              gd_path:        '\0'-terminated C string
 429  *                                              containing pathname of
 430  *                                              directory in local file system
 431  *                              gd_version:     fdparm structure version
 432  *                      size:   size in bytes of passed in nfsctl_fdparm
 433  * Output:
 434  *      On success:     passed-in buffer filled with nfsctl_res
 435  *                      (a fixed-length raw NFS file handle);
 436  *                      return code is the size in bytes of the file handle
 437  *      On error:       return code is negative errno value
 438  *
 439  * Note: Only AF_INET client addresses are passed in, since gd_addr
 440  * is the same size as a struct sockaddr_in.
 441  */
 442 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 443 {
 444         struct nfsctl_fdparm *data;
 445         struct sockaddr_in *sin;
 446         struct auth_domain *clp;
 447         int err = 0;
 448         struct knfsd_fh fh;
 449         char *res;
 450         struct in6_addr in6;
 451
 452         if (size < sizeof(*data))
 453                 return -EINVAL;
 454         data = (struct nfsctl_fdparm*)buf;
 455         err = -EPROTONOSUPPORT;
 456         if (data->gd_addr.sa_family != AF_INET)
 457                 goto out;
 458         err = -EINVAL;
 459         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 460                 goto out;
 461
 462         res = buf;
 463         sin = (struct sockaddr_in *)&data->gd_addr;
 464         exp_readlock();
 465
 466         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 467
 468         clp = auth_unix_lookup(&in6);
 469         if (!clp)
 470                 err = -EPERM;
 471         else {
 472                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 473                 auth_domain_put(clp);
 474         }
 475         exp_readunlock();
 476
 477         if (err == 0) {
 478                 memset(res,0, NFS_FHSIZE);
 479                 memcpy(res, &fh.fh_base, fh.fh_size);
 480                 err = NFS_FHSIZE;
 481         }
 482  out:
 483         return err;
 484 }
 485
 486 /**
 487  * write_unlock_ip - Release all locks used by a client
 488  *
 489  * Experimental.
 490  *
 491  * Input:
 492  *                      buf:    '\n'-terminated C string containing a
 493  *                              presentation format IPv4 address
 494  *                      size:   length of C string in @buf
 495  * Output:
 496  *      On success:     returns zero if all specified locks were released;
 497  *                      returns one if one or more locks were not released
 498  *      On error:       return code is negative errno value
 499  *
 500  * Note: Only AF_INET client addresses are passed in
 501  */
 502 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 503 {
 504         struct sockaddr_in sin = {
 505                 .sin_family     = AF_INET,
 506         };
 507         int b1, b2, b3, b4;
 508         char c;
 509         char *fo_path;
 510
 511         /* sanity check */
 512         if (size == 0)
 513                 return -EINVAL;
 514
 515         if (buf[size-1] != '\n')
 516                 return -EINVAL;
 517
 518         fo_path = buf;
 519         if (qword_get(&buf, fo_path, size) < 0)
 520                 return -EINVAL;
 521
 522         /* get ipv4 address */
 523         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 524                 return -EINVAL;
 525         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
 526                 return -EINVAL;
 527         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
 528
 529         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
 530 }
 531
 532 /**
 533  * write_unlock_fs - Release all locks on a local file system
 534  *
 535  * Experimental.
 536  *
 537  * Input:
 538  *                      buf:    '\n'-terminated C string containing the
 539  *                              absolute pathname of a local file system
 540  *                      size:   length of C string in @buf
 541  * Output:
 542  *      On success:     returns zero if all specified locks were released;
 543  *                      returns one if one or more locks were not released
 544  *      On error:       return code is negative errno value
 545  */
 546 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 547 {
 548         struct path path;
 549         char *fo_path;
 550         int error;
 551
 552         /* sanity check */
 553         if (size == 0)
 554                 return -EINVAL;
 555
 556         if (buf[size-1] != '\n')
 557                 return -EINVAL;
 558
 559         fo_path = buf;
 560         if (qword_get(&buf, fo_path, size) < 0)
 561                 return -EINVAL;
 562
 563         error = kern_path(fo_path, 0, &path);
 564         if (error)
 565                 return error;
 566
 567         /*
 568          * XXX: Needs better sanity checking.  Otherwise we could end up
 569          * releasing locks on the wrong file system.
 570          *
 571          * For example:
 572          * 1.  Does the path refer to a directory?
 573          * 2.  Is that directory a mount point, or
 574          * 3.  Is that directory the root of an exported file system?
 575          */
 576         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 577
 578         path_put(&path);
 579         return error;
 580 }
 581
 582 /**
 583  * write_filehandle - Get a variable-length NFS file handle by path
 584  *
 585  * On input, the buffer contains a '\n'-terminated C string comprised of
 586  * three alphanumeric words separated by whitespace.  The string may
 587  * contain escape sequences.
 588  *
 589  * Input:
 590  *                      buf:
 591  *                              domain:         client domain name
 592  *                              path:           export pathname
 593  *                              maxsize:        numeric maximum size of
 594  *                                              @buf
 595  *                      size:   length of C string in @buf
 596  * Output:
 597  *      On success:     passed-in buffer filled with '\n'-terminated C
 598  *                      string containing a ASCII hex text version
 599  *                      of the NFS file handle;
 600  *                      return code is the size in bytes of the string
 601  *      On error:       return code is negative errno value
 602  */
 603 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 604 {
 605         char *dname, *path;
 606         int uninitialized_var(maxsize);
 607         char *mesg = buf;
 608         int len;
 609         struct auth_domain *dom;
 610         struct knfsd_fh fh;
 611
 612         if (size == 0)
 613                 return -EINVAL;
 614
 615         if (buf[size-1] != '\n')
 616                 return -EINVAL;
 617         buf[size-1] = 0;
 618
 619         dname = mesg;
 620         len = qword_get(&mesg, dname, size);
 621         if (len <= 0)
 622                 return -EINVAL;
 623
 624         path = dname+len+1;
 625         len = qword_get(&mesg, path, size);
 626         if (len <= 0)
 627                 return -EINVAL;
 628
 629         len = get_int(&mesg, &maxsize);
 630         if (len)
 631                 return len;
 632
 633         if (maxsize < NFS_FHSIZE)
 634                 return -EINVAL;
 635         if (maxsize > NFS3_FHSIZE)
 636                 maxsize = NFS3_FHSIZE;
 637
 638         if (qword_get(&mesg, mesg, size)>0)
 639                 return -EINVAL;
 640
 641         /* we have all the words, they are in buf.. */
 642         dom = unix_domain_find(dname);
 643         if (!dom)
 644                 return -ENOMEM;
 645
 646         len = exp_rootfh(dom, path, &fh,  maxsize);
 647         auth_domain_put(dom);
 648         if (len)
 649                 return len;
 650
 651         mesg = buf;
 652         len = SIMPLE_TRANSACTION_LIMIT;
 653         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 654         mesg[-1] = '\n';
 655         return mesg - buf;
 656 }
 657
 658 /**
 659  * write_threads - Start NFSD, or report the current number of running threads
 660  *
 661  * Input:
 662  *                      buf:            ignored
 663  *                      size:           zero
 664  * Output:
 665  *      On success:     passed-in buffer filled with '\n'-terminated C
 666  *                      string numeric value representing the number of
 667  *                      running NFSD threads;
 668  *                      return code is the size in bytes of the string
 669  *      On error:       return code is zero
 670  *
 671  * OR
 672  *
 673  * Input:
 674  *                      buf:            C string containing an unsigned
 675  *                                      integer value representing the
 676  *                                      number of NFSD threads to start
 677  *                      size:           non-zero length of C string in @buf
 678  * Output:
 679  *      On success:     NFS service is started;
 680  *                      passed-in buffer filled with '\n'-terminated C
 681  *                      string numeric value representing the number of
 682  *                      running NFSD threads;
 683  *                      return code is the size in bytes of the string
 684  *      On error:       return code is zero or a negative errno value
 685  */
 686 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 687 {
 688         char *mesg = buf;
 689         int rv;
 690         if (size > 0) {
 691                 int newthreads;
 692                 rv = get_int(&mesg, &newthreads);
 693                 if (rv)
 694                         return rv;
 695                 if (newthreads < 0)
 696                         return -EINVAL;
 697                 rv = nfsd_svc(NFS_PORT, newthreads);
 698                 if (rv < 0)
 699                         return rv;
 700         } else
 701                 rv = nfsd_nrthreads();
 702
 703         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 704 }
 705
 706 /**
 707  * write_pool_threads - Set or report the current number of threads per pool
 708  *
 709  * Input:
 710  *                      buf:            ignored
 711  *                      size:           zero
 712  *
 713  * OR
 714  *
 715  * Input:
 716  *                      buf:            C string containing whitespace-
 717  *                                      separated unsigned integer values
 718  *                                      representing the number of NFSD
 719  *                                      threads to start in each pool
 720  *                      size:           non-zero length of C string in @buf
 721  * Output:
 722  *      On success:     passed-in buffer filled with '\n'-terminated C
 723  *                      string containing integer values representing the
 724  *                      number of NFSD threads in each pool;
 725  *                      return code is the size in bytes of the string
 726  *      On error:       return code is zero or a negative errno value
 727  */
 728 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 729 {
 730         /* if size > 0, look for an array of number of threads per node
 731          * and apply them  then write out number of threads per node as reply
 732          */
 733         char *mesg = buf;
 734         int i;
 735         int rv;
 736         int len;
 737         int npools;
 738         int *nthreads;
 739
 740         mutex_lock(&nfsd_mutex);
 741         npools = nfsd_nrpools();
 742         if (npools == 0) {
 743                 /*
 744                  * NFS is shut down.  The admin can start it by
 745                  * writing to the threads file but NOT the pool_threads
 746                  * file, sorry.  Report zero threads.
 747                  */
 748                 mutex_unlock(&nfsd_mutex);
 749                 strcpy(buf, "0\n");
 750                 return strlen(buf);
 751         }
 752
 753         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 754         rv = -ENOMEM;
 755         if (nthreads == NULL)
 756                 goto out_free;
 757
 758         if (size > 0) {
 759                 for (i = 0; i < npools; i++) {
 760                         rv = get_int(&mesg, &nthreads[i]);
 761                         if (rv == -ENOENT)
 762                                 break;          /* fewer numbers than pools */
 763                         if (rv)
 764                                 goto out_free;  /* syntax error */
 765                         rv = -EINVAL;
 766                         if (nthreads[i] < 0)
 767                                 goto out_free;
 768                 }
 769                 rv = nfsd_set_nrthreads(i, nthreads);
 770                 if (rv)
 771                         goto out_free;
 772         }
 773
 774         rv = nfsd_get_nrthreads(npools, nthreads);
 775         if (rv)
 776                 goto out_free;
 777
 778         mesg = buf;
 779         size = SIMPLE_TRANSACTION_LIMIT;
 780         for (i = 0; i < npools && size > 0; i++) {
 781                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 782                 len = strlen(mesg);
 783                 size -= len;
 784                 mesg += len;
 785         }
 786
 787         mutex_unlock(&nfsd_mutex);
 788         return (mesg-buf);
 789
 790 out_free:
 791         kfree(nthreads);
 792         mutex_unlock(&nfsd_mutex);
 793         return rv;
 794 }
 795
 796 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 797 {
 798         char *mesg = buf;
 799         char *vers, *minorp, sign;
 800         int len, num, remaining;
 801         unsigned minor;
 802         ssize_t tlen = 0;
 803         char *sep;
 804
 805         if (size>0) {
 806                 if (nfsd_serv)
 807                         /* Cannot change versions without updating
 808                          * nfsd_serv->sv_xdrsize, and reallocing
 809                          * rq_argp and rq_resp
 810                          */
 811                         return -EBUSY;
 812                 if (buf[size-1] != '\n')
 813                         return -EINVAL;
 814                 buf[size-1] = 0;
 815
 816                 vers = mesg;
 817                 len = qword_get(&mesg, vers, size);
 818                 if (len <= 0) return -EINVAL;
 819                 do {
 820                         sign = *vers;
 821                         if (sign == '+' || sign == '-')
 822                                 num = simple_strtol((vers+1), &minorp, 0);
 823                         else
 824                                 num = simple_strtol(vers, &minorp, 0);
 825                         if (*minorp == '.') {
 826                                 if (num < 4)
 827                                         return -EINVAL;
 828                                 minor = simple_strtoul(minorp+1, NULL, 0);
 829                                 if (minor == 0)
 830                                         return -EINVAL;
 831                                 if (nfsd_minorversion(minor, sign == '-' ?
 832                                                      NFSD_CLEAR : NFSD_SET) < 0)
 833                                         return -EINVAL;
 834                                 goto next;
 835                         }
 836                         switch(num) {
 837                         case 2:
 838                         case 3:
 839                         case 4:
 840                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 841                                 break;
 842                         default:
 843                                 return -EINVAL;
 844                         }
 845                 next:
 846                         vers += len + 1;
 847                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 848                 /* If all get turned off, turn them back on, as
 849                  * having no versions is BAD
 850                  */
 851                 nfsd_reset_versions();
 852         }
 853
 854         /* Now write current state into reply buffer */
 855         len = 0;
 856         sep = "";
 857         remaining = SIMPLE_TRANSACTION_LIMIT;
 858         for (num=2 ; num <= 4 ; num++)
 859                 if (nfsd_vers(num, NFSD_AVAIL)) {
 860                         len = snprintf(buf, remaining, "%s%c%d", sep,
 861                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 862                                        num);
 863                         sep = " ";
 864
 865                         if (len > remaining)
 866                                 break;
 867                         remaining -= len;
 868                         buf += len;
 869                         tlen += len;
 870                 }
 871         if (nfsd_vers(4, NFSD_AVAIL))
 872                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 873                      minor++) {
 874                         len = snprintf(buf, remaining, " %c4.%u",
 875                                         (nfsd_vers(4, NFSD_TEST) &&
 876                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 877                                                 '+' : '-',
 878                                         minor);
 879
 880                         if (len > remaining)
 881                                 break;
 882                         remaining -= len;
 883                         buf += len;
 884                         tlen += len;
 885                 }
 886
 887         len = snprintf(buf, remaining, "\n");
 888         if (len > remaining)
 889                 return -EINVAL;
 890         return tlen + len;
 891 }
 892
 893 /**
 894  * write_versions - Set or report the available NFS protocol versions
 895  *
 896  * Input:
 897  *                      buf:            ignored
 898  *                      size:           zero
 899  * Output:
 900  *      On success:     passed-in buffer filled with '\n'-terminated C
 901  *                      string containing positive or negative integer
 902  *                      values representing the current status of each
 903  *                      protocol version;
 904  *                      return code is the size in bytes of the string
 905  *      On error:       return code is zero or a negative errno value
 906  *
 907  * OR
 908  *
 909  * Input:
 910  *                      buf:            C string containing whitespace-
 911  *                                      separated positive or negative
 912  *                                      integer values representing NFS
 913  *                                      protocol versions to enable ("+n")
 914  *                                      or disable ("-n")
 915  *                      size:           non-zero length of C string in @buf
 916  * Output:
 917  *      On success:     status of zero or more protocol versions has
 918  *                      been updated; passed-in buffer filled with
 919  *                      '\n'-terminated C string containing positive
 920  *                      or negative integer values representing the
 921  *                      current status of each protocol version;
 922  *                      return code is the size in bytes of the string
 923  *      On error:       return code is zero or a negative errno value
 924  */
 925 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 926 {
 927         ssize_t rv;
 928
 929         mutex_lock(&nfsd_mutex);
 930         rv = __write_versions(file, buf, size);
 931         mutex_unlock(&nfsd_mutex);
 932         return rv;
 933 }
 934
 935 /*
 936  * Zero-length write.  Return a list of NFSD's current listener
 937  * transports.
 938  */
 939 static ssize_t __write_ports_names(char *buf)
 940 {
 941         if (nfsd_serv == NULL)
 942                 return 0;
 943         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 944 }
 945
 946 /*
 947  * A single 'fd' number was written, in which case it must be for
 948  * a socket of a supported family/protocol, and we use it as an
 949  * nfsd listener.
 950  */
 951 static ssize_t __write_ports_addfd(char *buf)
 952 {
 953         char *mesg = buf;
 954         int fd, err;
 955
 956         err = get_int(&mesg, &fd);
 957         if (err != 0 || fd < 0)
 958                 return -EINVAL;
 959
 960         err = nfsd_create_serv();
 961         if (err != 0)
 962                 return err;
 963
 964         err = lockd_up();
 965         if (err != 0)
 966                 goto out;
 967
 968         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 969         if (err < 0)
 970                 lockd_down();
 971
 972 out:
 973         /* Decrease the count, but don't shut down the service */
 974         nfsd_serv->sv_nrthreads--;
 975         return err;
 976 }
 977
 978 /*
 979  * A '-' followed by the 'name' of a socket means we close the socket.
 980  */
 981 static ssize_t __write_ports_delfd(char *buf)
 982 {
 983         char *toclose;
 984         int len = 0;
 985
 986         toclose = kstrdup(buf + 1, GFP_KERNEL);
 987         if (toclose == NULL)
 988                 return -ENOMEM;
 989
 990         if (nfsd_serv != NULL)
 991                 len = svc_sock_names(nfsd_serv, buf,
 992                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 993         if (len >= 0)
 994                 lockd_down();
 995
 996         kfree(toclose);
 997         return len;
 998 }
 999
1000 /*
1001  * A transport listener is added by writing it's transport name and
1002  * a port number.
1003  */
1004 static ssize_t __write_ports_addxprt(char *buf)
1005 {
1006         char transport[16];
1007         int port, err;
1008
1009         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1010                 return -EINVAL;
1011
1012         if (port < 1 || port > USHORT_MAX)
1013                 return -EINVAL;
1014
1015         err = nfsd_create_serv();
1016         if (err != 0)
1017                 return err;
1018
1019         err = svc_create_xprt(nfsd_serv, transport,
1020                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1021         if (err < 0) {
1022                 /* Give a reasonable perror msg for bad transport string */
1023                 if (err == -ENOENT)
1024                         err = -EPROTONOSUPPORT;
1025                 return err;
1026         }
1027         return 0;
1028 }
1029
1030 /*
1031  * A transport listener is removed by writing a "-", it's transport
1032  * name, and it's port number.
1033  */
1034 static ssize_t __write_ports_delxprt(char *buf)
1035 {
1036         struct svc_xprt *xprt;
1037         char transport[16];
1038         int port;
1039
1040         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1041                 return -EINVAL;
1042
1043         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1044                 return -EINVAL;
1045
1046         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1047         if (xprt == NULL)
1048                 return -ENOTCONN;
1049
1050         svc_close_xprt(xprt);
1051         svc_xprt_put(xprt);
1052         return 0;
1053 }
1054
1055 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1056 {
1057         if (size == 0)
1058                 return __write_ports_names(buf);
1059
1060         if (isdigit(buf[0]))
1061                 return __write_ports_addfd(buf);
1062
1063         if (buf[0] == '-' && isdigit(buf[1]))
1064                 return __write_ports_delfd(buf);
1065
1066         if (isalpha(buf[0]))
1067                 return __write_ports_addxprt(buf);
1068
1069         if (buf[0] == '-' && isalpha(buf[1]))
1070                 return __write_ports_delxprt(buf);
1071
1072         return -EINVAL;
1073 }
1074
1075 /**
1076  * write_ports - Pass a socket file descriptor or transport name to listen on
1077  *
1078  * Input:
1079  *                      buf:            ignored
1080  *                      size:           zero
1081  * Output:
1082  *      On success:     passed-in buffer filled with a '\n'-terminated C
1083  *                      string containing a whitespace-separated list of
1084  *                      named NFSD listeners;
1085  *                      return code is the size in bytes of the string
1086  *      On error:       return code is zero or a negative errno value
1087  *
1088  * OR
1089  *
1090  * Input:
1091  *                      buf:            C string containing an unsigned
1092  *                                      integer value representing a bound
1093  *                                      but unconnected socket that is to be
1094  *                                      used as an NFSD listener; listen(3)
1095  *                                      must be called for a SOCK_STREAM
1096  *                                      socket, otherwise it is ignored
1097  *                      size:           non-zero length of C string in @buf
1098  * Output:
1099  *      On success:     NFS service is started;
1100  *                      passed-in buffer filled with a '\n'-terminated C
1101  *                      string containing a unique alphanumeric name of
1102  *                      the listener;
1103  *                      return code is the size in bytes of the string
1104  *      On error:       return code is a negative errno value
1105  *
1106  * OR
1107  *
1108  * Input:
1109  *                      buf:            C string containing a "-" followed
1110  *                                      by an integer value representing a
1111  *                                      previously passed in socket file
1112  *                                      descriptor
1113  *                      size:           non-zero length of C string in @buf
1114  * Output:
1115  *      On success:     NFS service no longer listens on that socket;
1116  *                      passed-in buffer filled with a '\n'-terminated C
1117  *                      string containing a unique name of the listener;
1118  *                      return code is the size in bytes of the string
1119  *      On error:       return code is a negative errno value
1120  *
1121  * OR
1122  *
1123  * Input:
1124  *                      buf:            C string containing a transport
1125  *                                      name and an unsigned integer value
1126  *                                      representing the port to listen on,
1127  *                                      separated by whitespace
1128  *                      size:           non-zero length of C string in @buf
1129  * Output:
1130  *      On success:     returns zero; NFS service is started
1131  *      On error:       return code is a negative errno value
1132  *
1133  * OR
1134  *
1135  * Input:
1136  *                      buf:            C string containing a "-" followed
1137  *                                      by a transport name and an unsigned
1138  *                                      integer value representing the port
1139  *                                      to listen on, separated by whitespace
1140  *                      size:           non-zero length of C string in @buf
1141  * Output:
1142  *      On success:     returns zero; NFS service no longer listens
1143  *                      on that transport
1144  *      On error:       return code is a negative errno value
1145  */
1146 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1147 {
1148         ssize_t rv;
1149
1150         mutex_lock(&nfsd_mutex);
1151         rv = __write_ports(file, buf, size);
1152         mutex_unlock(&nfsd_mutex);
1153         return rv;
1154 }
1155
1156
1157 int nfsd_max_blksize;
1158
1159 /**
1160  * write_maxblksize - Set or report the current NFS blksize
1161  *
1162  * Input:
1163  *                      buf:            ignored
1164  *                      size:           zero
1165  *
1166  * OR
1167  *
1168  * Input:
1169  *                      buf:            C string containing an unsigned
1170  *                                      integer value representing the new
1171  *                                      NFS blksize
1172  *                      size:           non-zero length of C string in @buf
1173  * Output:
1174  *      On success:     passed-in buffer filled with '\n'-terminated C string
1175  *                      containing numeric value of the current NFS blksize
1176  *                      setting;
1177  *                      return code is the size in bytes of the string
1178  *      On error:       return code is zero or a negative errno value
1179  */
1180 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1181 {
1182         char *mesg = buf;
1183         if (size > 0) {
1184                 int bsize;
1185                 int rv = get_int(&mesg, &bsize);
1186                 if (rv)
1187                         return rv;
1188                 /* force bsize into allowed range and
1189                  * required alignment.
1190                  */
1191                 if (bsize < 1024)
1192                         bsize = 1024;
1193                 if (bsize > NFSSVC_MAXBLKSIZE)
1194                         bsize = NFSSVC_MAXBLKSIZE;
1195                 bsize &= ~(1024-1);
1196                 mutex_lock(&nfsd_mutex);
1197                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1198                         mutex_unlock(&nfsd_mutex);
1199                         return -EBUSY;
1200                 }
1201                 nfsd_max_blksize = bsize;
1202                 mutex_unlock(&nfsd_mutex);
1203         }
1204
1205         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1206                                                         nfsd_max_blksize);
1207 }
1208
1209 #ifdef CONFIG_NFSD_V4
1210 extern time_t nfs4_leasetime(void);
1211
1212 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1213 {
1214         /* if size > 10 seconds, call
1215          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1216          */
1217         char *mesg = buf;
1218         int rv, lease;
1219
1220         if (size > 0) {
1221                 if (nfsd_serv)
1222                         return -EBUSY;
1223                 rv = get_int(&mesg, &lease);
1224                 if (rv)
1225                         return rv;
1226                 if (lease < 10 || lease > 3600)
1227                         return -EINVAL;
1228                 nfs4_reset_lease(lease);
1229         }
1230
1231         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1232                                                         nfs4_lease_time());
1233 }
1234
1235 /**
1236  * write_leasetime - Set or report the current NFSv4 lease time
1237  *
1238  * Input:
1239  *                      buf:            ignored
1240  *                      size:           zero
1241  *
1242  * OR
1243  *
1244  * Input:
1245  *                      buf:            C string containing an unsigned
1246  *                                      integer value representing the new
1247  *                                      NFSv4 lease expiry time
1248  *                      size:           non-zero length of C string in @buf
1249  * Output:
1250  *      On success:     passed-in buffer filled with '\n'-terminated C
1251  *                      string containing unsigned integer value of the
1252  *                      current lease expiry time;
1253  *                      return code is the size in bytes of the string
1254  *      On error:       return code is zero or a negative errno value
1255  */
1256 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1257 {
1258         ssize_t rv;
1259
1260         mutex_lock(&nfsd_mutex);
1261         rv = __write_leasetime(file, buf, size);
1262         mutex_unlock(&nfsd_mutex);
1263         return rv;
1264 }
1265
1266 extern char *nfs4_recoverydir(void);
1267
1268 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1269 {
1270         char *mesg = buf;
1271         char *recdir;
1272         int len, status;
1273
1274         if (size > 0) {
1275                 if (nfsd_serv)
1276                         return -EBUSY;
1277                 if (size > PATH_MAX || buf[size-1] != '\n')
1278                         return -EINVAL;
1279                 buf[size-1] = 0;
1280
1281                 recdir = mesg;
1282                 len = qword_get(&mesg, recdir, size);
1283                 if (len <= 0)
1284                         return -EINVAL;
1285
1286                 status = nfs4_reset_recoverydir(recdir);
1287         }
1288
1289         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1290                                                         nfs4_recoverydir());
1291 }
1292
1293 /**
1294  * write_recoverydir - Set or report the pathname of the recovery directory
1295  *
1296  * Input:
1297  *                      buf:            ignored
1298  *                      size:           zero
1299  *
1300  * OR
1301  *
1302  * Input:
1303  *                      buf:            C string containing the pathname
1304  *                                      of the directory on a local file
1305  *                                      system containing permanent NFSv4
1306  *                                      recovery data
1307  *                      size:           non-zero length of C string in @buf
1308  * Output:
1309  *      On success:     passed-in buffer filled with '\n'-terminated C string
1310  *                      containing the current recovery pathname setting;
1311  *                      return code is the size in bytes of the string
1312  *      On error:       return code is zero or a negative errno value
1313  */
1314 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1315 {
1316         ssize_t rv;
1317
1318         mutex_lock(&nfsd_mutex);
1319         rv = __write_recoverydir(file, buf, size);
1320         mutex_unlock(&nfsd_mutex);
1321         return rv;
1322 }
1323
1324 #endif
1325
1326 /*----------------------------------------------------------------------------*/
1327 /*
1328  *      populating the filesystem.
1329  */
1330
1331 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1332 {
1333         static struct tree_descr nfsd_files[] = {
1334                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1335                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1336                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1337                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1338                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1339                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1340                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1341                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1342                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1343                                         &transaction_ops, S_IWUSR|S_IRUSR},
1344                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1345                                         &transaction_ops, S_IWUSR|S_IRUSR},
1346                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1347                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1348                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1349                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1350                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1351                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1352                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1353 #ifdef CONFIG_NFSD_V4
1354                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1355                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1356 #endif
1357                 /* last one */ {""}
1358         };
1359         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1360 }
1361
1362 static int nfsd_get_sb(struct file_system_type *fs_type,
1363         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1364 {
1365         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1366 }
1367
1368 static struct file_system_type nfsd_fs_type = {
1369         .owner          = THIS_MODULE,
1370         .name           = "nfsd",
1371         .get_sb         = nfsd_get_sb,
1372         .kill_sb        = kill_litter_super,
1373 };
1374
1375 #ifdef CONFIG_PROC_FS
1376 static int create_proc_exports_entry(void)
1377 {
1378         struct proc_dir_entry *entry;
1379
1380         entry = proc_mkdir("fs/nfs", NULL);
1381         if (!entry)
1382                 return -ENOMEM;
1383         entry = proc_create("exports", 0, entry, &exports_operations);
1384         if (!entry)
1385                 return -ENOMEM;
1386         return 0;
1387 }
1388 #else /* CONFIG_PROC_FS */
1389 static int create_proc_exports_entry(void)
1390 {
1391         return 0;
1392 }
1393 #endif
1394
1395 static int __init init_nfsd(void)
1396 {
1397         int retval;
1398         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1399
1400         retval = nfs4_state_init(); /* nfs4 locking state */
1401         if (retval)
1402                 return retval;
1403         nfsd_stat_init();       /* Statistics */
1404         retval = nfsd_reply_cache_init();
1405         if (retval)
1406                 goto out_free_stat;
1407         retval = nfsd_export_init();
1408         if (retval)
1409                 goto out_free_cache;
1410         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1411         retval = nfsd_idmap_init();
1412         if (retval)
1413                 goto out_free_lockd;
1414         retval = create_proc_exports_entry();
1415         if (retval)
1416                 goto out_free_idmap;
1417         retval = register_filesystem(&nfsd_fs_type);
1418         if (retval)
1419                 goto out_free_all;
1420         return 0;
1421 out_free_all:
1422         remove_proc_entry("fs/nfs/exports", NULL);
1423         remove_proc_entry("fs/nfs", NULL);
1424 out_free_idmap:
1425         nfsd_idmap_shutdown();
1426 out_free_lockd:
1427         nfsd_lockd_shutdown();
1428         nfsd_export_shutdown();
1429 out_free_cache:
1430         nfsd_reply_cache_shutdown();
1431 out_free_stat:
1432         nfsd_stat_shutdown();
1433         nfsd4_free_slabs();
1434         return retval;
1435 }
1436
1437 static void __exit exit_nfsd(void)
1438 {
1439         nfsd_export_shutdown();
1440         nfsd_reply_cache_shutdown();
1441         remove_proc_entry("fs/nfs/exports", NULL);
1442         remove_proc_entry("fs/nfs", NULL);
1443         nfsd_stat_shutdown();
1444         nfsd_lockd_shutdown();
1445         nfsd_idmap_shutdown();
1446         nfsd4_free_slabs();
1447         unregister_filesystem(&nfsd_fs_type);
1448 }
1449
1450 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1451 MODULE_LICENSE("GPL");
1452 module_init(init_nfsd)
1453 module_exit(exit_nfsd)