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/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         int err;
 211         if (size < sizeof(*data))
 212                 return -EINVAL;
 213         data = (struct nfsctl_svc*) buf;
 214         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 215         if (err < 0)
 216                 return err;
 217         return 0;
 218 }
 219
 220 /**
 221  * write_add - Add or modify client entry in auth unix cache
 222  *
 223  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 224  * Function remains to support old versions of nfs-utils.
 225  *
 226  * Input:
 227  *                      buf:    struct nfsctl_client
 228  *                              cl_ident:       '\0'-terminated C string
 229  *                                              containing domain name
 230  *                                              of client
 231  *                              cl_naddr:       no. of items in cl_addrlist
 232  *                              cl_addrlist:    array of client addresses
 233  *                              cl_fhkeytype:   ignored
 234  *                              cl_fhkeylen:    ignored
 235  *                              cl_fhkey:       ignored
 236  *                      size:   size in bytes of passed in nfsctl_client
 237  * Output:
 238  *      On success:     returns zero
 239  *      On error:       return code is negative errno value
 240  *
 241  * Note: Only AF_INET client addresses are passed in, since
 242  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 243  */
 244 static ssize_t write_add(struct file *file, char *buf, size_t size)
 245 {
 246         struct nfsctl_client *data;
 247         if (size < sizeof(*data))
 248                 return -EINVAL;
 249         data = (struct nfsctl_client *)buf;
 250         return exp_addclient(data);
 251 }
 252
 253 /**
 254  * write_del - Remove client from auth unix cache
 255  *
 256  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 257  * Function remains to support old versions of nfs-utils.
 258  *
 259  * Input:
 260  *                      buf:    struct nfsctl_client
 261  *                              cl_ident:       '\0'-terminated C string
 262  *                                              containing domain name
 263  *                                              of client
 264  *                              cl_naddr:       ignored
 265  *                              cl_addrlist:    ignored
 266  *                              cl_fhkeytype:   ignored
 267  *                              cl_fhkeylen:    ignored
 268  *                              cl_fhkey:       ignored
 269  *                      size:   size in bytes of passed in nfsctl_client
 270  * Output:
 271  *      On success:     returns zero
 272  *      On error:       return code is negative errno value
 273  *
 274  * Note: Only AF_INET client addresses are passed in, since
 275  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 276  */
 277 static ssize_t write_del(struct file *file, char *buf, size_t size)
 278 {
 279         struct nfsctl_client *data;
 280         if (size < sizeof(*data))
 281                 return -EINVAL;
 282         data = (struct nfsctl_client *)buf;
 283         return exp_delclient(data);
 284 }
 285
 286 /**
 287  * write_export - Export part or all of a local file system
 288  *
 289  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 290  * Function remains to support old versions of nfs-utils.
 291  *
 292  * Input:
 293  *                      buf:    struct nfsctl_export
 294  *                              ex_client:      '\0'-terminated C string
 295  *                                              containing domain name
 296  *                                              of client allowed to access
 297  *                                              this export
 298  *                              ex_path:        '\0'-terminated C string
 299  *                                              containing pathname of
 300  *                                              directory in local file system
 301  *                              ex_dev:         fsid to use for this export
 302  *                              ex_ino:         ignored
 303  *                              ex_flags:       export flags for this export
 304  *                              ex_anon_uid:    UID to use for anonymous
 305  *                                              requests
 306  *                              ex_anon_gid:    GID to use for anonymous
 307  *                                              requests
 308  *                      size:   size in bytes of passed in nfsctl_export
 309  * Output:
 310  *      On success:     returns zero
 311  *      On error:       return code is negative errno value
 312  */
 313 static ssize_t write_export(struct file *file, char *buf, size_t size)
 314 {
 315         struct nfsctl_export *data;
 316         if (size < sizeof(*data))
 317                 return -EINVAL;
 318         data = (struct nfsctl_export*)buf;
 319         return exp_export(data);
 320 }
 321
 322 /**
 323  * write_unexport - Unexport a previously exported file system
 324  *
 325  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 326  * Function remains to support old versions of nfs-utils.
 327  *
 328  * Input:
 329  *                      buf:    struct nfsctl_export
 330  *                              ex_client:      '\0'-terminated C string
 331  *                                              containing domain name
 332  *                                              of client no longer allowed
 333  *                                              to access this export
 334  *                              ex_path:        '\0'-terminated C string
 335  *                                              containing pathname of
 336  *                                              directory in local file system
 337  *                              ex_dev:         ignored
 338  *                              ex_ino:         ignored
 339  *                              ex_flags:       ignored
 340  *                              ex_anon_uid:    ignored
 341  *                              ex_anon_gid:    ignored
 342  *                      size:   size in bytes of passed in nfsctl_export
 343  * Output:
 344  *      On success:     returns zero
 345  *      On error:       return code is negative errno value
 346  */
 347 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 348 {
 349         struct nfsctl_export *data;
 350
 351         if (size < sizeof(*data))
 352                 return -EINVAL;
 353         data = (struct nfsctl_export*)buf;
 354         return exp_unexport(data);
 355 }
 356
 357 /**
 358  * write_getfs - Get a variable-length NFS file handle by path
 359  *
 360  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 361  * Function remains to support old versions of nfs-utils.
 362  *
 363  * Input:
 364  *                      buf:    struct nfsctl_fsparm
 365  *                              gd_addr:        socket address of client
 366  *                              gd_path:        '\0'-terminated C string
 367  *                                              containing pathname of
 368  *                                              directory in local file system
 369  *                              gd_maxlen:      maximum size of returned file
 370  *                                              handle
 371  *                      size:   size in bytes of passed in nfsctl_fsparm
 372  * Output:
 373  *      On success:     passed-in buffer filled with a knfsd_fh structure
 374  *                      (a variable-length raw NFS file handle);
 375  *                      return code is the size in bytes of the file handle
 376  *      On error:       return code is negative errno value
 377  *
 378  * Note: Only AF_INET client addresses are passed in, since gd_addr
 379  * is the same size as a struct sockaddr_in.
 380  */
 381 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 382 {
 383         struct nfsctl_fsparm *data;
 384         struct sockaddr_in *sin;
 385         struct auth_domain *clp;
 386         int err = 0;
 387         struct knfsd_fh *res;
 388         struct in6_addr in6;
 389
 390         if (size < sizeof(*data))
 391                 return -EINVAL;
 392         data = (struct nfsctl_fsparm*)buf;
 393         err = -EPROTONOSUPPORT;
 394         if (data->gd_addr.sa_family != AF_INET)
 395                 goto out;
 396         sin = (struct sockaddr_in *)&data->gd_addr;
 397         if (data->gd_maxlen > NFS3_FHSIZE)
 398                 data->gd_maxlen = NFS3_FHSIZE;
 399
 400         res = (struct knfsd_fh*)buf;
 401
 402         exp_readlock();
 403
 404         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 405
 406         clp = auth_unix_lookup(&in6);
 407         if (!clp)
 408                 err = -EPERM;
 409         else {
 410                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 411                 auth_domain_put(clp);
 412         }
 413         exp_readunlock();
 414         if (err == 0)
 415                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 416  out:
 417         return err;
 418 }
 419
 420 /**
 421  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 422  *
 423  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 424  * Function remains to support old versions of nfs-utils.
 425  *
 426  * Input:
 427  *                      buf:    struct nfsctl_fdparm
 428  *                              gd_addr:        socket address of client
 429  *                              gd_path:        '\0'-terminated C string
 430  *                                              containing pathname of
 431  *                                              directory in local file system
 432  *                              gd_version:     fdparm structure version
 433  *                      size:   size in bytes of passed in nfsctl_fdparm
 434  * Output:
 435  *      On success:     passed-in buffer filled with nfsctl_res
 436  *                      (a fixed-length raw NFS file handle);
 437  *                      return code is the size in bytes of the file handle
 438  *      On error:       return code is negative errno value
 439  *
 440  * Note: Only AF_INET client addresses are passed in, since gd_addr
 441  * is the same size as a struct sockaddr_in.
 442  */
 443 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 444 {
 445         struct nfsctl_fdparm *data;
 446         struct sockaddr_in *sin;
 447         struct auth_domain *clp;
 448         int err = 0;
 449         struct knfsd_fh fh;
 450         char *res;
 451         struct in6_addr in6;
 452
 453         if (size < sizeof(*data))
 454                 return -EINVAL;
 455         data = (struct nfsctl_fdparm*)buf;
 456         err = -EPROTONOSUPPORT;
 457         if (data->gd_addr.sa_family != AF_INET)
 458                 goto out;
 459         err = -EINVAL;
 460         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 461                 goto out;
 462
 463         res = buf;
 464         sin = (struct sockaddr_in *)&data->gd_addr;
 465         exp_readlock();
 466
 467         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 468
 469         clp = auth_unix_lookup(&in6);
 470         if (!clp)
 471                 err = -EPERM;
 472         else {
 473                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 474                 auth_domain_put(clp);
 475         }
 476         exp_readunlock();
 477
 478         if (err == 0) {
 479                 memset(res,0, NFS_FHSIZE);
 480                 memcpy(res, &fh.fh_base, fh.fh_size);
 481                 err = NFS_FHSIZE;
 482         }
 483  out:
 484         return err;
 485 }
 486
 487 /**
 488  * write_unlock_ip - Release all locks used by a client
 489  *
 490  * Experimental.
 491  *
 492  * Input:
 493  *                      buf:    '\n'-terminated C string containing a
 494  *                              presentation format IPv4 address
 495  *                      size:   length of C string in @buf
 496  * Output:
 497  *      On success:     returns zero if all specified locks were released;
 498  *                      returns one if one or more locks were not released
 499  *      On error:       return code is negative errno value
 500  *
 501  * Note: Only AF_INET client addresses are passed in
 502  */
 503 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 504 {
 505         struct sockaddr_in sin = {
 506                 .sin_family     = AF_INET,
 507         };
 508         int b1, b2, b3, b4;
 509         char c;
 510         char *fo_path;
 511
 512         /* sanity check */
 513         if (size == 0)
 514                 return -EINVAL;
 515
 516         if (buf[size-1] != '\n')
 517                 return -EINVAL;
 518
 519         fo_path = buf;
 520         if (qword_get(&buf, fo_path, size) < 0)
 521                 return -EINVAL;
 522
 523         /* get ipv4 address */
 524         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 525                 return -EINVAL;
 526         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
 527                 return -EINVAL;
 528         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
 529
 530         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
 531 }
 532
 533 /**
 534  * write_unlock_fs - Release all locks on a local file system
 535  *
 536  * Experimental.
 537  *
 538  * Input:
 539  *                      buf:    '\n'-terminated C string containing the
 540  *                              absolute pathname of a local file system
 541  *                      size:   length of C string in @buf
 542  * Output:
 543  *      On success:     returns zero if all specified locks were released;
 544  *                      returns one if one or more locks were not released
 545  *      On error:       return code is negative errno value
 546  */
 547 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 548 {
 549         struct path path;
 550         char *fo_path;
 551         int error;
 552
 553         /* sanity check */
 554         if (size == 0)
 555                 return -EINVAL;
 556
 557         if (buf[size-1] != '\n')
 558                 return -EINVAL;
 559
 560         fo_path = buf;
 561         if (qword_get(&buf, fo_path, size) < 0)
 562                 return -EINVAL;
 563
 564         error = kern_path(fo_path, 0, &path);
 565         if (error)
 566                 return error;
 567
 568         /*
 569          * XXX: Needs better sanity checking.  Otherwise we could end up
 570          * releasing locks on the wrong file system.
 571          *
 572          * For example:
 573          * 1.  Does the path refer to a directory?
 574          * 2.  Is that directory a mount point, or
 575          * 3.  Is that directory the root of an exported file system?
 576          */
 577         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 578
 579         path_put(&path);
 580         return error;
 581 }
 582
 583 /**
 584  * write_filehandle - Get a variable-length NFS file handle by path
 585  *
 586  * On input, the buffer contains a '\n'-terminated C string comprised of
 587  * three alphanumeric words separated by whitespace.  The string may
 588  * contain escape sequences.
 589  *
 590  * Input:
 591  *                      buf:
 592  *                              domain:         client domain name
 593  *                              path:           export pathname
 594  *                              maxsize:        numeric maximum size of
 595  *                                              @buf
 596  *                      size:   length of C string in @buf
 597  * Output:
 598  *      On success:     passed-in buffer filled with '\n'-terminated C
 599  *                      string containing a ASCII hex text version
 600  *                      of the NFS file handle;
 601  *                      return code is the size in bytes of the string
 602  *      On error:       return code is negative errno value
 603  */
 604 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 605 {
 606         char *dname, *path;
 607         int uninitialized_var(maxsize);
 608         char *mesg = buf;
 609         int len;
 610         struct auth_domain *dom;
 611         struct knfsd_fh fh;
 612
 613         if (size == 0)
 614                 return -EINVAL;
 615
 616         if (buf[size-1] != '\n')
 617                 return -EINVAL;
 618         buf[size-1] = 0;
 619
 620         dname = mesg;
 621         len = qword_get(&mesg, dname, size);
 622         if (len <= 0)
 623                 return -EINVAL;
 624
 625         path = dname+len+1;
 626         len = qword_get(&mesg, path, size);
 627         if (len <= 0)
 628                 return -EINVAL;
 629
 630         len = get_int(&mesg, &maxsize);
 631         if (len)
 632                 return len;
 633
 634         if (maxsize < NFS_FHSIZE)
 635                 return -EINVAL;
 636         if (maxsize > NFS3_FHSIZE)
 637                 maxsize = NFS3_FHSIZE;
 638
 639         if (qword_get(&mesg, mesg, size)>0)
 640                 return -EINVAL;
 641
 642         /* we have all the words, they are in buf.. */
 643         dom = unix_domain_find(dname);
 644         if (!dom)
 645                 return -ENOMEM;
 646
 647         len = exp_rootfh(dom, path, &fh,  maxsize);
 648         auth_domain_put(dom);
 649         if (len)
 650                 return len;
 651
 652         mesg = buf;
 653         len = SIMPLE_TRANSACTION_LIMIT;
 654         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 655         mesg[-1] = '\n';
 656         return mesg - buf;
 657 }
 658
 659 /**
 660  * write_threads - Start NFSD, or report the current number of running threads
 661  *
 662  * Input:
 663  *                      buf:            ignored
 664  *                      size:           zero
 665  * Output:
 666  *      On success:     passed-in buffer filled with '\n'-terminated C
 667  *                      string numeric value representing the number of
 668  *                      running NFSD threads;
 669  *                      return code is the size in bytes of the string
 670  *      On error:       return code is zero
 671  *
 672  * OR
 673  *
 674  * Input:
 675  *                      buf:            C string containing an unsigned
 676  *                                      integer value representing the
 677  *                                      number of NFSD threads to start
 678  *                      size:           non-zero length of C string in @buf
 679  * Output:
 680  *      On success:     NFS service is started;
 681  *                      passed-in buffer filled with '\n'-terminated C
 682  *                      string numeric value representing the number of
 683  *                      running NFSD threads;
 684  *                      return code is the size in bytes of the string
 685  *      On error:       return code is zero or a negative errno value
 686  */
 687 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 688 {
 689         char *mesg = buf;
 690         int rv;
 691         if (size > 0) {
 692                 int newthreads;
 693                 rv = get_int(&mesg, &newthreads);
 694                 if (rv)
 695                         return rv;
 696                 if (newthreads < 0)
 697                         return -EINVAL;
 698                 rv = nfsd_svc(NFS_PORT, newthreads);
 699                 if (rv < 0)
 700                         return rv;
 701         } else
 702                 rv = nfsd_nrthreads();
 703
 704         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 705 }
 706
 707 /**
 708  * write_pool_threads - Set or report the current number of threads per pool
 709  *
 710  * Input:
 711  *                      buf:            ignored
 712  *                      size:           zero
 713  *
 714  * OR
 715  *
 716  * Input:
 717  *                      buf:            C string containing whitespace-
 718  *                                      separated unsigned integer values
 719  *                                      representing the number of NFSD
 720  *                                      threads to start in each pool
 721  *                      size:           non-zero length of C string in @buf
 722  * Output:
 723  *      On success:     passed-in buffer filled with '\n'-terminated C
 724  *                      string containing integer values representing the
 725  *                      number of NFSD threads in each pool;
 726  *                      return code is the size in bytes of the string
 727  *      On error:       return code is zero or a negative errno value
 728  */
 729 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 730 {
 731         /* if size > 0, look for an array of number of threads per node
 732          * and apply them  then write out number of threads per node as reply
 733          */
 734         char *mesg = buf;
 735         int i;
 736         int rv;
 737         int len;
 738         int npools;
 739         int *nthreads;
 740
 741         mutex_lock(&nfsd_mutex);
 742         npools = nfsd_nrpools();
 743         if (npools == 0) {
 744                 /*
 745                  * NFS is shut down.  The admin can start it by
 746                  * writing to the threads file but NOT the pool_threads
 747                  * file, sorry.  Report zero threads.
 748                  */
 749                 mutex_unlock(&nfsd_mutex);
 750                 strcpy(buf, "0\n");
 751                 return strlen(buf);
 752         }
 753
 754         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 755         rv = -ENOMEM;
 756         if (nthreads == NULL)
 757                 goto out_free;
 758
 759         if (size > 0) {
 760                 for (i = 0; i < npools; i++) {
 761                         rv = get_int(&mesg, &nthreads[i]);
 762                         if (rv == -ENOENT)
 763                                 break;          /* fewer numbers than pools */
 764                         if (rv)
 765                                 goto out_free;  /* syntax error */
 766                         rv = -EINVAL;
 767                         if (nthreads[i] < 0)
 768                                 goto out_free;
 769                 }
 770                 rv = nfsd_set_nrthreads(i, nthreads);
 771                 if (rv)
 772                         goto out_free;
 773         }
 774
 775         rv = nfsd_get_nrthreads(npools, nthreads);
 776         if (rv)
 777                 goto out_free;
 778
 779         mesg = buf;
 780         size = SIMPLE_TRANSACTION_LIMIT;
 781         for (i = 0; i < npools && size > 0; i++) {
 782                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 783                 len = strlen(mesg);
 784                 size -= len;
 785                 mesg += len;
 786         }
 787
 788         mutex_unlock(&nfsd_mutex);
 789         return (mesg-buf);
 790
 791 out_free:
 792         kfree(nthreads);
 793         mutex_unlock(&nfsd_mutex);
 794         return rv;
 795 }
 796
 797 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 798 {
 799         char *mesg = buf;
 800         char *vers, *minorp, sign;
 801         int len, num, remaining;
 802         unsigned minor;
 803         ssize_t tlen = 0;
 804         char *sep;
 805
 806         if (size>0) {
 807                 if (nfsd_serv)
 808                         /* Cannot change versions without updating
 809                          * nfsd_serv->sv_xdrsize, and reallocing
 810                          * rq_argp and rq_resp
 811                          */
 812                         return -EBUSY;
 813                 if (buf[size-1] != '\n')
 814                         return -EINVAL;
 815                 buf[size-1] = 0;
 816
 817                 vers = mesg;
 818                 len = qword_get(&mesg, vers, size);
 819                 if (len <= 0) return -EINVAL;
 820                 do {
 821                         sign = *vers;
 822                         if (sign == '+' || sign == '-')
 823                                 num = simple_strtol((vers+1), &minorp, 0);
 824                         else
 825                                 num = simple_strtol(vers, &minorp, 0);
 826                         if (*minorp == '.') {
 827                                 if (num < 4)
 828                                         return -EINVAL;
 829                                 minor = simple_strtoul(minorp+1, NULL, 0);
 830                                 if (minor == 0)
 831                                         return -EINVAL;
 832                                 if (nfsd_minorversion(minor, sign == '-' ?
 833                                                      NFSD_CLEAR : NFSD_SET) < 0)
 834                                         return -EINVAL;
 835                                 goto next;
 836                         }
 837                         switch(num) {
 838                         case 2:
 839                         case 3:
 840                         case 4:
 841                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 842                                 break;
 843                         default:
 844                                 return -EINVAL;
 845                         }
 846                 next:
 847                         vers += len + 1;
 848                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 849                 /* If all get turned off, turn them back on, as
 850                  * having no versions is BAD
 851                  */
 852                 nfsd_reset_versions();
 853         }
 854
 855         /* Now write current state into reply buffer */
 856         len = 0;
 857         sep = "";
 858         remaining = SIMPLE_TRANSACTION_LIMIT;
 859         for (num=2 ; num <= 4 ; num++)
 860                 if (nfsd_vers(num, NFSD_AVAIL)) {
 861                         len = snprintf(buf, remaining, "%s%c%d", sep,
 862                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 863                                        num);
 864                         sep = " ";
 865
 866                         if (len > remaining)
 867                                 break;
 868                         remaining -= len;
 869                         buf += len;
 870                         tlen += len;
 871                 }
 872         if (nfsd_vers(4, NFSD_AVAIL))
 873                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 874                      minor++) {
 875                         len = snprintf(buf, remaining, " %c4.%u",
 876                                         (nfsd_vers(4, NFSD_TEST) &&
 877                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 878                                                 '+' : '-',
 879                                         minor);
 880
 881                         if (len > remaining)
 882                                 break;
 883                         remaining -= len;
 884                         buf += len;
 885                         tlen += len;
 886                 }
 887
 888         len = snprintf(buf, remaining, "\n");
 889         if (len > remaining)
 890                 return -EINVAL;
 891         return tlen + len;
 892 }
 893
 894 /**
 895  * write_versions - Set or report the available NFS protocol versions
 896  *
 897  * Input:
 898  *                      buf:            ignored
 899  *                      size:           zero
 900  * Output:
 901  *      On success:     passed-in buffer filled with '\n'-terminated C
 902  *                      string containing positive or negative integer
 903  *                      values representing the current status of each
 904  *                      protocol version;
 905  *                      return code is the size in bytes of the string
 906  *      On error:       return code is zero or a negative errno value
 907  *
 908  * OR
 909  *
 910  * Input:
 911  *                      buf:            C string containing whitespace-
 912  *                                      separated positive or negative
 913  *                                      integer values representing NFS
 914  *                                      protocol versions to enable ("+n")
 915  *                                      or disable ("-n")
 916  *                      size:           non-zero length of C string in @buf
 917  * Output:
 918  *      On success:     status of zero or more protocol versions has
 919  *                      been updated; passed-in buffer filled with
 920  *                      '\n'-terminated C string containing positive
 921  *                      or negative integer values representing the
 922  *                      current status of each protocol version;
 923  *                      return code is the size in bytes of the string
 924  *      On error:       return code is zero or a negative errno value
 925  */
 926 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 927 {
 928         ssize_t rv;
 929
 930         mutex_lock(&nfsd_mutex);
 931         rv = __write_versions(file, buf, size);
 932         mutex_unlock(&nfsd_mutex);
 933         return rv;
 934 }
 935
 936 /*
 937  * Zero-length write.  Return a list of NFSD's current listener
 938  * transports.
 939  */
 940 static ssize_t __write_ports_names(char *buf)
 941 {
 942         if (nfsd_serv == NULL)
 943                 return 0;
 944         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 945 }
 946
 947 /*
 948  * A single 'fd' number was written, in which case it must be for
 949  * a socket of a supported family/protocol, and we use it as an
 950  * nfsd listener.
 951  */
 952 static ssize_t __write_ports_addfd(char *buf)
 953 {
 954         char *mesg = buf;
 955         int fd, err;
 956
 957         err = get_int(&mesg, &fd);
 958         if (err != 0 || fd < 0)
 959                 return -EINVAL;
 960
 961         err = nfsd_create_serv();
 962         if (err != 0)
 963                 return err;
 964
 965         err = lockd_up();
 966         if (err != 0)
 967                 goto out;
 968
 969         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 970         if (err < 0)
 971                 lockd_down();
 972
 973 out:
 974         /* Decrease the count, but don't shut down the service */
 975         nfsd_serv->sv_nrthreads--;
 976         return err;
 977 }
 978
 979 /*
 980  * A '-' followed by the 'name' of a socket means we close the socket.
 981  */
 982 static ssize_t __write_ports_delfd(char *buf)
 983 {
 984         char *toclose;
 985         int len = 0;
 986
 987         toclose = kstrdup(buf + 1, GFP_KERNEL);
 988         if (toclose == NULL)
 989                 return -ENOMEM;
 990
 991         if (nfsd_serv != NULL)
 992                 len = svc_sock_names(nfsd_serv, buf,
 993                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 994         if (len >= 0)
 995                 lockd_down();
 996
 997         kfree(toclose);
 998         return len;
 999 }
1000
1001 /*
1002  * A transport listener is added by writing it's transport name and
1003  * a port number.
1004  */
1005 static ssize_t __write_ports_addxprt(char *buf)
1006 {
1007         char transport[16];
1008         int port, err;
1009
1010         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1011                 return -EINVAL;
1012
1013         if (port < 1 || port > USHORT_MAX)
1014                 return -EINVAL;
1015
1016         err = nfsd_create_serv();
1017         if (err != 0)
1018                 return err;
1019
1020         err = svc_create_xprt(nfsd_serv, transport,
1021                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1022         if (err < 0) {
1023                 /* Give a reasonable perror msg for bad transport string */
1024                 if (err == -ENOENT)
1025                         err = -EPROTONOSUPPORT;
1026                 return err;
1027         }
1028         return 0;
1029 }
1030
1031 /*
1032  * A transport listener is removed by writing a "-", it's transport
1033  * name, and it's port number.
1034  */
1035 static ssize_t __write_ports_delxprt(char *buf)
1036 {
1037         struct svc_xprt *xprt;
1038         char transport[16];
1039         int port;
1040
1041         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1042                 return -EINVAL;
1043
1044         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1045                 return -EINVAL;
1046
1047         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1048         if (xprt == NULL)
1049                 return -ENOTCONN;
1050
1051         svc_close_xprt(xprt);
1052         svc_xprt_put(xprt);
1053         return 0;
1054 }
1055
1056 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1057 {
1058         if (size == 0)
1059                 return __write_ports_names(buf);
1060
1061         if (isdigit(buf[0]))
1062                 return __write_ports_addfd(buf);
1063
1064         if (buf[0] == '-' && isdigit(buf[1]))
1065                 return __write_ports_delfd(buf);
1066
1067         if (isalpha(buf[0]))
1068                 return __write_ports_addxprt(buf);
1069
1070         if (buf[0] == '-' && isalpha(buf[1]))
1071                 return __write_ports_delxprt(buf);
1072
1073         return -EINVAL;
1074 }
1075
1076 /**
1077  * write_ports - Pass a socket file descriptor or transport name to listen on
1078  *
1079  * Input:
1080  *                      buf:            ignored
1081  *                      size:           zero
1082  * Output:
1083  *      On success:     passed-in buffer filled with a '\n'-terminated C
1084  *                      string containing a whitespace-separated list of
1085  *                      named NFSD listeners;
1086  *                      return code is the size in bytes of the string
1087  *      On error:       return code is zero or a negative errno value
1088  *
1089  * OR
1090  *
1091  * Input:
1092  *                      buf:            C string containing an unsigned
1093  *                                      integer value representing a bound
1094  *                                      but unconnected socket that is to be
1095  *                                      used as an NFSD listener; listen(3)
1096  *                                      must be called for a SOCK_STREAM
1097  *                                      socket, otherwise it is ignored
1098  *                      size:           non-zero length of C string in @buf
1099  * Output:
1100  *      On success:     NFS service is started;
1101  *                      passed-in buffer filled with a '\n'-terminated C
1102  *                      string containing a unique alphanumeric name of
1103  *                      the listener;
1104  *                      return code is the size in bytes of the string
1105  *      On error:       return code is a negative errno value
1106  *
1107  * OR
1108  *
1109  * Input:
1110  *                      buf:            C string containing a "-" followed
1111  *                                      by an integer value representing a
1112  *                                      previously passed in socket file
1113  *                                      descriptor
1114  *                      size:           non-zero length of C string in @buf
1115  * Output:
1116  *      On success:     NFS service no longer listens on that socket;
1117  *                      passed-in buffer filled with a '\n'-terminated C
1118  *                      string containing a unique name of the listener;
1119  *                      return code is the size in bytes of the string
1120  *      On error:       return code is a negative errno value
1121  *
1122  * OR
1123  *
1124  * Input:
1125  *                      buf:            C string containing a transport
1126  *                                      name and an unsigned integer value
1127  *                                      representing the port to listen on,
1128  *                                      separated by whitespace
1129  *                      size:           non-zero length of C string in @buf
1130  * Output:
1131  *      On success:     returns zero; NFS service is started
1132  *      On error:       return code is a negative errno value
1133  *
1134  * OR
1135  *
1136  * Input:
1137  *                      buf:            C string containing a "-" followed
1138  *                                      by a transport name and an unsigned
1139  *                                      integer value representing the port
1140  *                                      to listen on, separated by whitespace
1141  *                      size:           non-zero length of C string in @buf
1142  * Output:
1143  *      On success:     returns zero; NFS service no longer listens
1144  *                      on that transport
1145  *      On error:       return code is a negative errno value
1146  */
1147 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1148 {
1149         ssize_t rv;
1150
1151         mutex_lock(&nfsd_mutex);
1152         rv = __write_ports(file, buf, size);
1153         mutex_unlock(&nfsd_mutex);
1154         return rv;
1155 }
1156
1157
1158 int nfsd_max_blksize;
1159
1160 /**
1161  * write_maxblksize - Set or report the current NFS blksize
1162  *
1163  * Input:
1164  *                      buf:            ignored
1165  *                      size:           zero
1166  *
1167  * OR
1168  *
1169  * Input:
1170  *                      buf:            C string containing an unsigned
1171  *                                      integer value representing the new
1172  *                                      NFS blksize
1173  *                      size:           non-zero length of C string in @buf
1174  * Output:
1175  *      On success:     passed-in buffer filled with '\n'-terminated C string
1176  *                      containing numeric value of the current NFS blksize
1177  *                      setting;
1178  *                      return code is the size in bytes of the string
1179  *      On error:       return code is zero or a negative errno value
1180  */
1181 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1182 {
1183         char *mesg = buf;
1184         if (size > 0) {
1185                 int bsize;
1186                 int rv = get_int(&mesg, &bsize);
1187                 if (rv)
1188                         return rv;
1189                 /* force bsize into allowed range and
1190                  * required alignment.
1191                  */
1192                 if (bsize < 1024)
1193                         bsize = 1024;
1194                 if (bsize > NFSSVC_MAXBLKSIZE)
1195                         bsize = NFSSVC_MAXBLKSIZE;
1196                 bsize &= ~(1024-1);
1197                 mutex_lock(&nfsd_mutex);
1198                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1199                         mutex_unlock(&nfsd_mutex);
1200                         return -EBUSY;
1201                 }
1202                 nfsd_max_blksize = bsize;
1203                 mutex_unlock(&nfsd_mutex);
1204         }
1205
1206         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1207                                                         nfsd_max_blksize);
1208 }
1209
1210 #ifdef CONFIG_NFSD_V4
1211 extern time_t nfs4_leasetime(void);
1212
1213 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1214 {
1215         /* if size > 10 seconds, call
1216          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1217          */
1218         char *mesg = buf;
1219         int rv, lease;
1220
1221         if (size > 0) {
1222                 if (nfsd_serv)
1223                         return -EBUSY;
1224                 rv = get_int(&mesg, &lease);
1225                 if (rv)
1226                         return rv;
1227                 if (lease < 10 || lease > 3600)
1228                         return -EINVAL;
1229                 nfs4_reset_lease(lease);
1230         }
1231
1232         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1233                                                         nfs4_lease_time());
1234 }
1235
1236 /**
1237  * write_leasetime - Set or report the current NFSv4 lease time
1238  *
1239  * Input:
1240  *                      buf:            ignored
1241  *                      size:           zero
1242  *
1243  * OR
1244  *
1245  * Input:
1246  *                      buf:            C string containing an unsigned
1247  *                                      integer value representing the new
1248  *                                      NFSv4 lease expiry time
1249  *                      size:           non-zero length of C string in @buf
1250  * Output:
1251  *      On success:     passed-in buffer filled with '\n'-terminated C
1252  *                      string containing unsigned integer value of the
1253  *                      current lease expiry time;
1254  *                      return code is the size in bytes of the string
1255  *      On error:       return code is zero or a negative errno value
1256  */
1257 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1258 {
1259         ssize_t rv;
1260
1261         mutex_lock(&nfsd_mutex);
1262         rv = __write_leasetime(file, buf, size);
1263         mutex_unlock(&nfsd_mutex);
1264         return rv;
1265 }
1266
1267 extern char *nfs4_recoverydir(void);
1268
1269 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1270 {
1271         char *mesg = buf;
1272         char *recdir;
1273         int len, status;
1274
1275         if (size > 0) {
1276                 if (nfsd_serv)
1277                         return -EBUSY;
1278                 if (size > PATH_MAX || buf[size-1] != '\n')
1279                         return -EINVAL;
1280                 buf[size-1] = 0;
1281
1282                 recdir = mesg;
1283                 len = qword_get(&mesg, recdir, size);
1284                 if (len <= 0)
1285                         return -EINVAL;
1286
1287                 status = nfs4_reset_recoverydir(recdir);
1288         }
1289
1290         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1291                                                         nfs4_recoverydir());
1292 }
1293
1294 /**
1295  * write_recoverydir - Set or report the pathname of the recovery directory
1296  *
1297  * Input:
1298  *                      buf:            ignored
1299  *                      size:           zero
1300  *
1301  * OR
1302  *
1303  * Input:
1304  *                      buf:            C string containing the pathname
1305  *                                      of the directory on a local file
1306  *                                      system containing permanent NFSv4
1307  *                                      recovery data
1308  *                      size:           non-zero length of C string in @buf
1309  * Output:
1310  *      On success:     passed-in buffer filled with '\n'-terminated C string
1311  *                      containing the current recovery pathname setting;
1312  *                      return code is the size in bytes of the string
1313  *      On error:       return code is zero or a negative errno value
1314  */
1315 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1316 {
1317         ssize_t rv;
1318
1319         mutex_lock(&nfsd_mutex);
1320         rv = __write_recoverydir(file, buf, size);
1321         mutex_unlock(&nfsd_mutex);
1322         return rv;
1323 }
1324
1325 #endif
1326
1327 /*----------------------------------------------------------------------------*/
1328 /*
1329  *      populating the filesystem.
1330  */
1331
1332 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1333 {
1334         static struct tree_descr nfsd_files[] = {
1335                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1336                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1337                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1338                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1339                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1340                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1341                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1342                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1343                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1344                                         &transaction_ops, S_IWUSR|S_IRUSR},
1345                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1346                                         &transaction_ops, S_IWUSR|S_IRUSR},
1347                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1348                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1349                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1350                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1351                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1352                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1353                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1354 #ifdef CONFIG_NFSD_V4
1355                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1356                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1357 #endif
1358                 /* last one */ {""}
1359         };
1360         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1361 }
1362
1363 static int nfsd_get_sb(struct file_system_type *fs_type,
1364         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1365 {
1366         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1367 }
1368
1369 static struct file_system_type nfsd_fs_type = {
1370         .owner          = THIS_MODULE,
1371         .name           = "nfsd",
1372         .get_sb         = nfsd_get_sb,
1373         .kill_sb        = kill_litter_super,
1374 };
1375
1376 #ifdef CONFIG_PROC_FS
1377 static int create_proc_exports_entry(void)
1378 {
1379         struct proc_dir_entry *entry;
1380
1381         entry = proc_mkdir("fs/nfs", NULL);
1382         if (!entry)
1383                 return -ENOMEM;
1384         entry = proc_create("exports", 0, entry, &exports_operations);
1385         if (!entry)
1386                 return -ENOMEM;
1387         return 0;
1388 }
1389 #else /* CONFIG_PROC_FS */
1390 static int create_proc_exports_entry(void)
1391 {
1392         return 0;
1393 }
1394 #endif
1395
1396 static int __init init_nfsd(void)
1397 {
1398         int retval;
1399         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1400
1401         retval = nfs4_state_init(); /* nfs4 locking state */
1402         if (retval)
1403                 return retval;
1404         nfsd_stat_init();       /* Statistics */
1405         retval = nfsd_reply_cache_init();
1406         if (retval)
1407                 goto out_free_stat;
1408         retval = nfsd_export_init();
1409         if (retval)
1410                 goto out_free_cache;
1411         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1412         retval = nfsd_idmap_init();
1413         if (retval)
1414                 goto out_free_lockd;
1415         retval = create_proc_exports_entry();
1416         if (retval)
1417                 goto out_free_idmap;
1418         retval = register_filesystem(&nfsd_fs_type);
1419         if (retval)
1420                 goto out_free_all;
1421         return 0;
1422 out_free_all:
1423         remove_proc_entry("fs/nfs/exports", NULL);
1424         remove_proc_entry("fs/nfs", NULL);
1425 out_free_idmap:
1426         nfsd_idmap_shutdown();
1427 out_free_lockd:
1428         nfsd_lockd_shutdown();
1429         nfsd_export_shutdown();
1430 out_free_cache:
1431         nfsd_reply_cache_shutdown();
1432 out_free_stat:
1433         nfsd_stat_shutdown();
1434         nfsd4_free_slabs();
1435         return retval;
1436 }
1437
1438 static void __exit exit_nfsd(void)
1439 {
1440         nfsd_export_shutdown();
1441         nfsd_reply_cache_shutdown();
1442         remove_proc_entry("fs/nfs/exports", NULL);
1443         remove_proc_entry("fs/nfs", NULL);
1444         nfsd_stat_shutdown();
1445         nfsd_lockd_shutdown();
1446         nfsd_idmap_shutdown();
1447         nfsd4_free_slabs();
1448         unregister_filesystem(&nfsd_fs_type);
1449 }
1450
1451 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1452 MODULE_LICENSE("GPL");
1453 module_init(init_nfsd)
1454 module_exit(exit_nfsd)