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         kfree(nthreads);
 789         mutex_unlock(&nfsd_mutex);
 790         return (mesg-buf);
 791
 792 out_free:
 793         kfree(nthreads);
 794         mutex_unlock(&nfsd_mutex);
 795         return rv;
 796 }
 797
 798 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 799 {
 800         char *mesg = buf;
 801         char *vers, *minorp, sign;
 802         int len, num, remaining;
 803         unsigned minor;
 804         ssize_t tlen = 0;
 805         char *sep;
 806
 807         if (size>0) {
 808                 if (nfsd_serv)
 809                         /* Cannot change versions without updating
 810                          * nfsd_serv->sv_xdrsize, and reallocing
 811                          * rq_argp and rq_resp
 812                          */
 813                         return -EBUSY;
 814                 if (buf[size-1] != '\n')
 815                         return -EINVAL;
 816                 buf[size-1] = 0;
 817
 818                 vers = mesg;
 819                 len = qword_get(&mesg, vers, size);
 820                 if (len <= 0) return -EINVAL;
 821                 do {
 822                         sign = *vers;
 823                         if (sign == '+' || sign == '-')
 824                                 num = simple_strtol((vers+1), &minorp, 0);
 825                         else
 826                                 num = simple_strtol(vers, &minorp, 0);
 827                         if (*minorp == '.') {
 828                                 if (num < 4)
 829                                         return -EINVAL;
 830                                 minor = simple_strtoul(minorp+1, NULL, 0);
 831                                 if (minor == 0)
 832                                         return -EINVAL;
 833                                 if (nfsd_minorversion(minor, sign == '-' ?
 834                                                      NFSD_CLEAR : NFSD_SET) < 0)
 835                                         return -EINVAL;
 836                                 goto next;
 837                         }
 838                         switch(num) {
 839                         case 2:
 840                         case 3:
 841                         case 4:
 842                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 843                                 break;
 844                         default:
 845                                 return -EINVAL;
 846                         }
 847                 next:
 848                         vers += len + 1;
 849                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 850                 /* If all get turned off, turn them back on, as
 851                  * having no versions is BAD
 852                  */
 853                 nfsd_reset_versions();
 854         }
 855
 856         /* Now write current state into reply buffer */
 857         len = 0;
 858         sep = "";
 859         remaining = SIMPLE_TRANSACTION_LIMIT;
 860         for (num=2 ; num <= 4 ; num++)
 861                 if (nfsd_vers(num, NFSD_AVAIL)) {
 862                         len = snprintf(buf, remaining, "%s%c%d", sep,
 863                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 864                                        num);
 865                         sep = " ";
 866
 867                         if (len > remaining)
 868                                 break;
 869                         remaining -= len;
 870                         buf += len;
 871                         tlen += len;
 872                 }
 873         if (nfsd_vers(4, NFSD_AVAIL))
 874                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 875                      minor++) {
 876                         len = snprintf(buf, remaining, " %c4.%u",
 877                                         (nfsd_vers(4, NFSD_TEST) &&
 878                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 879                                                 '+' : '-',
 880                                         minor);
 881
 882                         if (len > remaining)
 883                                 break;
 884                         remaining -= len;
 885                         buf += len;
 886                         tlen += len;
 887                 }
 888
 889         len = snprintf(buf, remaining, "\n");
 890         if (len > remaining)
 891                 return -EINVAL;
 892         return tlen + len;
 893 }
 894
 895 /**
 896  * write_versions - Set or report the available NFS protocol versions
 897  *
 898  * Input:
 899  *                      buf:            ignored
 900  *                      size:           zero
 901  * Output:
 902  *      On success:     passed-in buffer filled with '\n'-terminated C
 903  *                      string containing positive or negative integer
 904  *                      values representing the current status of each
 905  *                      protocol version;
 906  *                      return code is the size in bytes of the string
 907  *      On error:       return code is zero or a negative errno value
 908  *
 909  * OR
 910  *
 911  * Input:
 912  *                      buf:            C string containing whitespace-
 913  *                                      separated positive or negative
 914  *                                      integer values representing NFS
 915  *                                      protocol versions to enable ("+n")
 916  *                                      or disable ("-n")
 917  *                      size:           non-zero length of C string in @buf
 918  * Output:
 919  *      On success:     status of zero or more protocol versions has
 920  *                      been updated; passed-in buffer filled with
 921  *                      '\n'-terminated C string containing positive
 922  *                      or negative integer values representing the
 923  *                      current status of each protocol version;
 924  *                      return code is the size in bytes of the string
 925  *      On error:       return code is zero or a negative errno value
 926  */
 927 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 928 {
 929         ssize_t rv;
 930
 931         mutex_lock(&nfsd_mutex);
 932         rv = __write_versions(file, buf, size);
 933         mutex_unlock(&nfsd_mutex);
 934         return rv;
 935 }
 936
 937 /*
 938  * Zero-length write.  Return a list of NFSD's current listener
 939  * transports.
 940  */
 941 static ssize_t __write_ports_names(char *buf)
 942 {
 943         if (nfsd_serv == NULL)
 944                 return 0;
 945         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 946 }
 947
 948 /*
 949  * A single 'fd' number was written, in which case it must be for
 950  * a socket of a supported family/protocol, and we use it as an
 951  * nfsd listener.
 952  */
 953 static ssize_t __write_ports_addfd(char *buf)
 954 {
 955         char *mesg = buf;
 956         int fd, err;
 957
 958         err = get_int(&mesg, &fd);
 959         if (err != 0 || fd < 0)
 960                 return -EINVAL;
 961
 962         err = nfsd_create_serv();
 963         if (err != 0)
 964                 return err;
 965
 966         err = lockd_up();
 967         if (err != 0)
 968                 goto out;
 969
 970         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 971         if (err < 0)
 972                 lockd_down();
 973
 974 out:
 975         /* Decrease the count, but don't shut down the service */
 976         nfsd_serv->sv_nrthreads--;
 977         return err;
 978 }
 979
 980 /*
 981  * A '-' followed by the 'name' of a socket means we close the socket.
 982  */
 983 static ssize_t __write_ports_delfd(char *buf)
 984 {
 985         char *toclose;
 986         int len = 0;
 987
 988         toclose = kstrdup(buf + 1, GFP_KERNEL);
 989         if (toclose == NULL)
 990                 return -ENOMEM;
 991
 992         if (nfsd_serv != NULL)
 993                 len = svc_sock_names(nfsd_serv, buf,
 994                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 995         if (len >= 0)
 996                 lockd_down();
 997
 998         kfree(toclose);
 999         return len;
1000 }
1001
1002 /*
1003  * A transport listener is added by writing it's transport name and
1004  * a port number.
1005  */
1006 static ssize_t __write_ports_addxprt(char *buf)
1007 {
1008         char transport[16];
1009         int port, err;
1010
1011         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1012                 return -EINVAL;
1013
1014         if (port < 1 || port > USHORT_MAX)
1015                 return -EINVAL;
1016
1017         err = nfsd_create_serv();
1018         if (err != 0)
1019                 return err;
1020
1021         err = svc_create_xprt(nfsd_serv, transport,
1022                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1023         if (err < 0) {
1024                 /* Give a reasonable perror msg for bad transport string */
1025                 if (err == -ENOENT)
1026                         err = -EPROTONOSUPPORT;
1027                 return err;
1028         }
1029         return 0;
1030 }
1031
1032 /*
1033  * A transport listener is removed by writing a "-", it's transport
1034  * name, and it's port number.
1035  */
1036 static ssize_t __write_ports_delxprt(char *buf)
1037 {
1038         struct svc_xprt *xprt;
1039         char transport[16];
1040         int port;
1041
1042         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1043                 return -EINVAL;
1044
1045         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1046                 return -EINVAL;
1047
1048         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1049         if (xprt == NULL)
1050                 return -ENOTCONN;
1051
1052         svc_close_xprt(xprt);
1053         svc_xprt_put(xprt);
1054         return 0;
1055 }
1056
1057 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1058 {
1059         if (size == 0)
1060                 return __write_ports_names(buf);
1061
1062         if (isdigit(buf[0]))
1063                 return __write_ports_addfd(buf);
1064
1065         if (buf[0] == '-' && isdigit(buf[1]))
1066                 return __write_ports_delfd(buf);
1067
1068         if (isalpha(buf[0]))
1069                 return __write_ports_addxprt(buf);
1070
1071         if (buf[0] == '-' && isalpha(buf[1]))
1072                 return __write_ports_delxprt(buf);
1073
1074         return -EINVAL;
1075 }
1076
1077 /**
1078  * write_ports - Pass a socket file descriptor or transport name to listen on
1079  *
1080  * Input:
1081  *                      buf:            ignored
1082  *                      size:           zero
1083  * Output:
1084  *      On success:     passed-in buffer filled with a '\n'-terminated C
1085  *                      string containing a whitespace-separated list of
1086  *                      named NFSD listeners;
1087  *                      return code is the size in bytes of the string
1088  *      On error:       return code is zero or a negative errno value
1089  *
1090  * OR
1091  *
1092  * Input:
1093  *                      buf:            C string containing an unsigned
1094  *                                      integer value representing a bound
1095  *                                      but unconnected socket that is to be
1096  *                                      used as an NFSD listener; listen(3)
1097  *                                      must be called for a SOCK_STREAM
1098  *                                      socket, otherwise it is ignored
1099  *                      size:           non-zero length of C string in @buf
1100  * Output:
1101  *      On success:     NFS service is started;
1102  *                      passed-in buffer filled with a '\n'-terminated C
1103  *                      string containing a unique alphanumeric name of
1104  *                      the listener;
1105  *                      return code is the size in bytes of the string
1106  *      On error:       return code is a negative errno value
1107  *
1108  * OR
1109  *
1110  * Input:
1111  *                      buf:            C string containing a "-" followed
1112  *                                      by an integer value representing a
1113  *                                      previously passed in socket file
1114  *                                      descriptor
1115  *                      size:           non-zero length of C string in @buf
1116  * Output:
1117  *      On success:     NFS service no longer listens on that socket;
1118  *                      passed-in buffer filled with a '\n'-terminated C
1119  *                      string containing a unique name of the listener;
1120  *                      return code is the size in bytes of the string
1121  *      On error:       return code is a negative errno value
1122  *
1123  * OR
1124  *
1125  * Input:
1126  *                      buf:            C string containing a transport
1127  *                                      name and an unsigned integer value
1128  *                                      representing the port to listen on,
1129  *                                      separated by whitespace
1130  *                      size:           non-zero length of C string in @buf
1131  * Output:
1132  *      On success:     returns zero; NFS service is started
1133  *      On error:       return code is a negative errno value
1134  *
1135  * OR
1136  *
1137  * Input:
1138  *                      buf:            C string containing a "-" followed
1139  *                                      by a transport name and an unsigned
1140  *                                      integer value representing the port
1141  *                                      to listen on, separated by whitespace
1142  *                      size:           non-zero length of C string in @buf
1143  * Output:
1144  *      On success:     returns zero; NFS service no longer listens
1145  *                      on that transport
1146  *      On error:       return code is a negative errno value
1147  */
1148 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1149 {
1150         ssize_t rv;
1151
1152         mutex_lock(&nfsd_mutex);
1153         rv = __write_ports(file, buf, size);
1154         mutex_unlock(&nfsd_mutex);
1155         return rv;
1156 }
1157
1158
1159 int nfsd_max_blksize;
1160
1161 /**
1162  * write_maxblksize - Set or report the current NFS blksize
1163  *
1164  * Input:
1165  *                      buf:            ignored
1166  *                      size:           zero
1167  *
1168  * OR
1169  *
1170  * Input:
1171  *                      buf:            C string containing an unsigned
1172  *                                      integer value representing the new
1173  *                                      NFS blksize
1174  *                      size:           non-zero length of C string in @buf
1175  * Output:
1176  *      On success:     passed-in buffer filled with '\n'-terminated C string
1177  *                      containing numeric value of the current NFS blksize
1178  *                      setting;
1179  *                      return code is the size in bytes of the string
1180  *      On error:       return code is zero or a negative errno value
1181  */
1182 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1183 {
1184         char *mesg = buf;
1185         if (size > 0) {
1186                 int bsize;
1187                 int rv = get_int(&mesg, &bsize);
1188                 if (rv)
1189                         return rv;
1190                 /* force bsize into allowed range and
1191                  * required alignment.
1192                  */
1193                 if (bsize < 1024)
1194                         bsize = 1024;
1195                 if (bsize > NFSSVC_MAXBLKSIZE)
1196                         bsize = NFSSVC_MAXBLKSIZE;
1197                 bsize &= ~(1024-1);
1198                 mutex_lock(&nfsd_mutex);
1199                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1200                         mutex_unlock(&nfsd_mutex);
1201                         return -EBUSY;
1202                 }
1203                 nfsd_max_blksize = bsize;
1204                 mutex_unlock(&nfsd_mutex);
1205         }
1206
1207         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1208                                                         nfsd_max_blksize);
1209 }
1210
1211 #ifdef CONFIG_NFSD_V4
1212 extern time_t nfs4_leasetime(void);
1213
1214 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1215 {
1216         /* if size > 10 seconds, call
1217          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1218          */
1219         char *mesg = buf;
1220         int rv, lease;
1221
1222         if (size > 0) {
1223                 if (nfsd_serv)
1224                         return -EBUSY;
1225                 rv = get_int(&mesg, &lease);
1226                 if (rv)
1227                         return rv;
1228                 if (lease < 10 || lease > 3600)
1229                         return -EINVAL;
1230                 nfs4_reset_lease(lease);
1231         }
1232
1233         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1234                                                         nfs4_lease_time());
1235 }
1236
1237 /**
1238  * write_leasetime - Set or report the current NFSv4 lease time
1239  *
1240  * Input:
1241  *                      buf:            ignored
1242  *                      size:           zero
1243  *
1244  * OR
1245  *
1246  * Input:
1247  *                      buf:            C string containing an unsigned
1248  *                                      integer value representing the new
1249  *                                      NFSv4 lease expiry time
1250  *                      size:           non-zero length of C string in @buf
1251  * Output:
1252  *      On success:     passed-in buffer filled with '\n'-terminated C
1253  *                      string containing unsigned integer value of the
1254  *                      current lease expiry time;
1255  *                      return code is the size in bytes of the string
1256  *      On error:       return code is zero or a negative errno value
1257  */
1258 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1259 {
1260         ssize_t rv;
1261
1262         mutex_lock(&nfsd_mutex);
1263         rv = __write_leasetime(file, buf, size);
1264         mutex_unlock(&nfsd_mutex);
1265         return rv;
1266 }
1267
1268 extern char *nfs4_recoverydir(void);
1269
1270 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1271 {
1272         char *mesg = buf;
1273         char *recdir;
1274         int len, status;
1275
1276         if (size > 0) {
1277                 if (nfsd_serv)
1278                         return -EBUSY;
1279                 if (size > PATH_MAX || buf[size-1] != '\n')
1280                         return -EINVAL;
1281                 buf[size-1] = 0;
1282
1283                 recdir = mesg;
1284                 len = qword_get(&mesg, recdir, size);
1285                 if (len <= 0)
1286                         return -EINVAL;
1287
1288                 status = nfs4_reset_recoverydir(recdir);
1289         }
1290
1291         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1292                                                         nfs4_recoverydir());
1293 }
1294
1295 /**
1296  * write_recoverydir - Set or report the pathname of the recovery directory
1297  *
1298  * Input:
1299  *                      buf:            ignored
1300  *                      size:           zero
1301  *
1302  * OR
1303  *
1304  * Input:
1305  *                      buf:            C string containing the pathname
1306  *                                      of the directory on a local file
1307  *                                      system containing permanent NFSv4
1308  *                                      recovery data
1309  *                      size:           non-zero length of C string in @buf
1310  * Output:
1311  *      On success:     passed-in buffer filled with '\n'-terminated C string
1312  *                      containing the current recovery pathname setting;
1313  *                      return code is the size in bytes of the string
1314  *      On error:       return code is zero or a negative errno value
1315  */
1316 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1317 {
1318         ssize_t rv;
1319
1320         mutex_lock(&nfsd_mutex);
1321         rv = __write_recoverydir(file, buf, size);
1322         mutex_unlock(&nfsd_mutex);
1323         return rv;
1324 }
1325
1326 #endif
1327
1328 /*----------------------------------------------------------------------------*/
1329 /*
1330  *      populating the filesystem.
1331  */
1332
1333 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1334 {
1335         static struct tree_descr nfsd_files[] = {
1336                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1337                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1338                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1339                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1340                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1341                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1342                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1343                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1344                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1345                                         &transaction_ops, S_IWUSR|S_IRUSR},
1346                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1347                                         &transaction_ops, S_IWUSR|S_IRUSR},
1348                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1349                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1350                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1351                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1352                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1353                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1354                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1355 #ifdef CONFIG_NFSD_V4
1356                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1357                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1358 #endif
1359                 /* last one */ {""}
1360         };
1361         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1362 }
1363
1364 static int nfsd_get_sb(struct file_system_type *fs_type,
1365         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1366 {
1367         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1368 }
1369
1370 static struct file_system_type nfsd_fs_type = {
1371         .owner          = THIS_MODULE,
1372         .name           = "nfsd",
1373         .get_sb         = nfsd_get_sb,
1374         .kill_sb        = kill_litter_super,
1375 };
1376
1377 #ifdef CONFIG_PROC_FS
1378 static int create_proc_exports_entry(void)
1379 {
1380         struct proc_dir_entry *entry;
1381
1382         entry = proc_mkdir("fs/nfs", NULL);
1383         if (!entry)
1384                 return -ENOMEM;
1385         entry = proc_create("exports", 0, entry, &exports_operations);
1386         if (!entry)
1387                 return -ENOMEM;
1388         return 0;
1389 }
1390 #else /* CONFIG_PROC_FS */
1391 static int create_proc_exports_entry(void)
1392 {
1393         return 0;
1394 }
1395 #endif
1396
1397 static int __init init_nfsd(void)
1398 {
1399         int retval;
1400         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1401
1402         retval = nfs4_state_init(); /* nfs4 locking state */
1403         if (retval)
1404                 return retval;
1405         nfsd_stat_init();       /* Statistics */
1406         retval = nfsd_reply_cache_init();
1407         if (retval)
1408                 goto out_free_stat;
1409         retval = nfsd_export_init();
1410         if (retval)
1411                 goto out_free_cache;
1412         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1413         retval = nfsd_idmap_init();
1414         if (retval)
1415                 goto out_free_lockd;
1416         retval = create_proc_exports_entry();
1417         if (retval)
1418                 goto out_free_idmap;
1419         retval = register_filesystem(&nfsd_fs_type);
1420         if (retval)
1421                 goto out_free_all;
1422         return 0;
1423 out_free_all:
1424         remove_proc_entry("fs/nfs/exports", NULL);
1425         remove_proc_entry("fs/nfs", NULL);
1426 out_free_idmap:
1427         nfsd_idmap_shutdown();
1428 out_free_lockd:
1429         nfsd_lockd_shutdown();
1430         nfsd_export_shutdown();
1431 out_free_cache:
1432         nfsd_reply_cache_shutdown();
1433 out_free_stat:
1434         nfsd_stat_shutdown();
1435         nfsd4_free_slabs();
1436         return retval;
1437 }
1438
1439 static void __exit exit_nfsd(void)
1440 {
1441         nfsd_export_shutdown();
1442         nfsd_reply_cache_shutdown();
1443         remove_proc_entry("fs/nfs/exports", NULL);
1444         remove_proc_entry("fs/nfs", NULL);
1445         nfsd_stat_shutdown();
1446         nfsd_lockd_shutdown();
1447         nfsd_idmap_shutdown();
1448         nfsd4_free_slabs();
1449         unregister_filesystem(&nfsd_fs_type);
1450 }
1451
1452 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1453 MODULE_LICENSE("GPL");
1454 module_init(init_nfsd)
1455 module_exit(exit_nfsd)