fs/nfsd/nfsctl.c

   1 /*
   2  * Syscall interface to knfsd.
   3  *
   4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/namei.h>
   9 #include <linux/ctype.h>
  10
  11 #include <linux/nfsd_idmap.h>
  12 #include <linux/sunrpc/svcsock.h>
  13 #include <linux/nfsd/syscall.h>
  14 #include <linux/lockd/lockd.h>
  15 #include <linux/sunrpc/clnt.h>
  16
  17 #include "nfsd.h"
  18 #include "cache.h"
  19
  20 /*
  21  *      We have a single directory with 9 nodes in it.
  22  */
  23 enum {
  24         NFSD_Root = 1,
  25 #ifdef CONFIG_NFSD_DEPRECATED
  26         NFSD_Svc,
  27         NFSD_Add,
  28         NFSD_Del,
  29         NFSD_Export,
  30         NFSD_Unexport,
  31         NFSD_Getfd,
  32         NFSD_Getfs,
  33 #endif
  34         NFSD_List,
  35         NFSD_Export_features,
  36         NFSD_Fh,
  37         NFSD_FO_UnlockIP,
  38         NFSD_FO_UnlockFS,
  39         NFSD_Threads,
  40         NFSD_Pool_Threads,
  41         NFSD_Pool_Stats,
  42         NFSD_Versions,
  43         NFSD_Ports,
  44         NFSD_MaxBlkSize,
  45         /*
  46          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  47          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  48          */
  49 #ifdef CONFIG_NFSD_V4
  50         NFSD_Leasetime,
  51         NFSD_Gracetime,
  52         NFSD_RecoveryDir,
  53 #endif
  54 };
  55
  56 /*
  57  * write() for these nodes.
  58  */
  59 #ifdef CONFIG_NFSD_DEPRECATED
  60 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  61 static ssize_t write_add(struct file *file, char *buf, size_t size);
  62 static ssize_t write_del(struct file *file, char *buf, size_t size);
  63 static ssize_t write_export(struct file *file, char *buf, size_t size);
  64 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  65 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  66 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  67 #endif
  68 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  69 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  70 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  71 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  72 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  73 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  74 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  75 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  76 #ifdef CONFIG_NFSD_V4
  77 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  78 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  79 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  80 #endif
  81
  82 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  83 #ifdef CONFIG_NFSD_DEPRECATED
  84         [NFSD_Svc] = write_svc,
  85         [NFSD_Add] = write_add,
  86         [NFSD_Del] = write_del,
  87         [NFSD_Export] = write_export,
  88         [NFSD_Unexport] = write_unexport,
  89         [NFSD_Getfd] = write_getfd,
  90         [NFSD_Getfs] = write_getfs,
  91 #endif
  92         [NFSD_Fh] = write_filehandle,
  93         [NFSD_FO_UnlockIP] = write_unlock_ip,
  94         [NFSD_FO_UnlockFS] = write_unlock_fs,
  95         [NFSD_Threads] = write_threads,
  96         [NFSD_Pool_Threads] = write_pool_threads,
  97         [NFSD_Versions] = write_versions,
  98         [NFSD_Ports] = write_ports,
  99         [NFSD_MaxBlkSize] = write_maxblksize,
 100 #ifdef CONFIG_NFSD_V4
 101         [NFSD_Leasetime] = write_leasetime,
 102         [NFSD_Gracetime] = write_gracetime,
 103         [NFSD_RecoveryDir] = write_recoverydir,
 104 #endif
 105 };
 106
 107 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 108 {
 109         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 110         char *data;
 111         ssize_t rv;
 112
 113         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 114                 return -EINVAL;
 115
 116         data = simple_transaction_get(file, buf, size);
 117         if (IS_ERR(data))
 118                 return PTR_ERR(data);
 119
 120         rv =  write_op[ino](file, data, size);
 121         if (rv >= 0) {
 122                 simple_transaction_set(file, rv);
 123                 rv = size;
 124         }
 125         return rv;
 126 }
 127
 128 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 129 {
 130         static int warned;
 131         if (file->f_dentry->d_name.name[0] == '.' && !warned) {
 132                 char name[sizeof(current->comm)];
 133                 printk(KERN_INFO
 134                        "Warning: \"%s\" uses deprecated NFSD interface: %s."
 135                        "  This will be removed in 2.6.40\n",
 136                        get_task_comm(name, current),
 137                        file->f_dentry->d_name.name);
 138                 warned = 1;
 139         }
 140         if (! file->private_data) {
 141                 /* An attempt to read a transaction file without writing
 142                  * causes a 0-byte write so that the file can return
 143                  * state information
 144                  */
 145                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 146                 if (rv < 0)
 147                         return rv;
 148         }
 149         return simple_transaction_read(file, buf, size, pos);
 150 }
 151
 152 static const struct file_operations transaction_ops = {
 153         .write          = nfsctl_transaction_write,
 154         .read           = nfsctl_transaction_read,
 155         .release        = simple_transaction_release,
 156 };
 157
 158 static int exports_open(struct inode *inode, struct file *file)
 159 {
 160         return seq_open(file, &nfs_exports_op);
 161 }
 162
 163 static const struct file_operations exports_operations = {
 164         .open           = exports_open,
 165         .read           = seq_read,
 166         .llseek         = seq_lseek,
 167         .release        = seq_release,
 168         .owner          = THIS_MODULE,
 169 };
 170
 171 static int export_features_show(struct seq_file *m, void *v)
 172 {
 173         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 174         return 0;
 175 }
 176
 177 static int export_features_open(struct inode *inode, struct file *file)
 178 {
 179         return single_open(file, export_features_show, NULL);
 180 }
 181
 182 static struct file_operations export_features_operations = {
 183         .open           = export_features_open,
 184         .read           = seq_read,
 185         .llseek         = seq_lseek,
 186         .release        = single_release,
 187 };
 188
 189 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 190 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 191
 192 static const struct file_operations pool_stats_operations = {
 193         .open           = nfsd_pool_stats_open,
 194         .read           = seq_read,
 195         .llseek         = seq_lseek,
 196         .release        = nfsd_pool_stats_release,
 197         .owner          = THIS_MODULE,
 198 };
 199
 200 /*----------------------------------------------------------------------------*/
 201 /*
 202  * payload - write methods
 203  */
 204
 205 #ifdef CONFIG_NFSD_DEPRECATED
 206 /**
 207  * write_svc - Start kernel's NFSD server
 208  *
 209  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 210  * Function remains to support old versions of nfs-utils.
 211  *
 212  * Input:
 213  *                      buf:    struct nfsctl_svc
 214  *                              svc_port:       port number of this
 215  *                                              server's listener
 216  *                              svc_nthreads:   number of threads to start
 217  *                      size:   size in bytes of passed in nfsctl_svc
 218  * Output:
 219  *      On success:     returns zero
 220  *      On error:       return code is negative errno value
 221  */
 222 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 223 {
 224         struct nfsctl_svc *data;
 225         int err;
 226         if (size < sizeof(*data))
 227                 return -EINVAL;
 228         data = (struct nfsctl_svc*) buf;
 229         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 230         if (err < 0)
 231                 return err;
 232         return 0;
 233 }
 234
 235 /**
 236  * write_add - Add or modify client entry in auth unix cache
 237  *
 238  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 239  * Function remains to support old versions of nfs-utils.
 240  *
 241  * Input:
 242  *                      buf:    struct nfsctl_client
 243  *                              cl_ident:       '\0'-terminated C string
 244  *                                              containing domain name
 245  *                                              of client
 246  *                              cl_naddr:       no. of items in cl_addrlist
 247  *                              cl_addrlist:    array of client addresses
 248  *                              cl_fhkeytype:   ignored
 249  *                              cl_fhkeylen:    ignored
 250  *                              cl_fhkey:       ignored
 251  *                      size:   size in bytes of passed in nfsctl_client
 252  * Output:
 253  *      On success:     returns zero
 254  *      On error:       return code is negative errno value
 255  *
 256  * Note: Only AF_INET client addresses are passed in, since
 257  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 258  */
 259 static ssize_t write_add(struct file *file, char *buf, size_t size)
 260 {
 261         struct nfsctl_client *data;
 262         if (size < sizeof(*data))
 263                 return -EINVAL;
 264         data = (struct nfsctl_client *)buf;
 265         return exp_addclient(data);
 266 }
 267
 268 /**
 269  * write_del - Remove client from auth unix cache
 270  *
 271  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 272  * Function remains to support old versions of nfs-utils.
 273  *
 274  * Input:
 275  *                      buf:    struct nfsctl_client
 276  *                              cl_ident:       '\0'-terminated C string
 277  *                                              containing domain name
 278  *                                              of client
 279  *                              cl_naddr:       ignored
 280  *                              cl_addrlist:    ignored
 281  *                              cl_fhkeytype:   ignored
 282  *                              cl_fhkeylen:    ignored
 283  *                              cl_fhkey:       ignored
 284  *                      size:   size in bytes of passed in nfsctl_client
 285  * Output:
 286  *      On success:     returns zero
 287  *      On error:       return code is negative errno value
 288  *
 289  * Note: Only AF_INET client addresses are passed in, since
 290  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 291  */
 292 static ssize_t write_del(struct file *file, char *buf, size_t size)
 293 {
 294         struct nfsctl_client *data;
 295         if (size < sizeof(*data))
 296                 return -EINVAL;
 297         data = (struct nfsctl_client *)buf;
 298         return exp_delclient(data);
 299 }
 300
 301 /**
 302  * write_export - Export part or all of a local file system
 303  *
 304  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 305  * Function remains to support old versions of nfs-utils.
 306  *
 307  * Input:
 308  *                      buf:    struct nfsctl_export
 309  *                              ex_client:      '\0'-terminated C string
 310  *                                              containing domain name
 311  *                                              of client allowed to access
 312  *                                              this export
 313  *                              ex_path:        '\0'-terminated C string
 314  *                                              containing pathname of
 315  *                                              directory in local file system
 316  *                              ex_dev:         fsid to use for this export
 317  *                              ex_ino:         ignored
 318  *                              ex_flags:       export flags for this export
 319  *                              ex_anon_uid:    UID to use for anonymous
 320  *                                              requests
 321  *                              ex_anon_gid:    GID to use for anonymous
 322  *                                              requests
 323  *                      size:   size in bytes of passed in nfsctl_export
 324  * Output:
 325  *      On success:     returns zero
 326  *      On error:       return code is negative errno value
 327  */
 328 static ssize_t write_export(struct file *file, char *buf, size_t size)
 329 {
 330         struct nfsctl_export *data;
 331         if (size < sizeof(*data))
 332                 return -EINVAL;
 333         data = (struct nfsctl_export*)buf;
 334         return exp_export(data);
 335 }
 336
 337 /**
 338  * write_unexport - Unexport a previously exported file system
 339  *
 340  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 341  * Function remains to support old versions of nfs-utils.
 342  *
 343  * Input:
 344  *                      buf:    struct nfsctl_export
 345  *                              ex_client:      '\0'-terminated C string
 346  *                                              containing domain name
 347  *                                              of client no longer allowed
 348  *                                              to access this export
 349  *                              ex_path:        '\0'-terminated C string
 350  *                                              containing pathname of
 351  *                                              directory in local file system
 352  *                              ex_dev:         ignored
 353  *                              ex_ino:         ignored
 354  *                              ex_flags:       ignored
 355  *                              ex_anon_uid:    ignored
 356  *                              ex_anon_gid:    ignored
 357  *                      size:   size in bytes of passed in nfsctl_export
 358  * Output:
 359  *      On success:     returns zero
 360  *      On error:       return code is negative errno value
 361  */
 362 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 363 {
 364         struct nfsctl_export *data;
 365
 366         if (size < sizeof(*data))
 367                 return -EINVAL;
 368         data = (struct nfsctl_export*)buf;
 369         return exp_unexport(data);
 370 }
 371
 372 /**
 373  * write_getfs - Get a variable-length NFS file handle by path
 374  *
 375  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 376  * Function remains to support old versions of nfs-utils.
 377  *
 378  * Input:
 379  *                      buf:    struct nfsctl_fsparm
 380  *                              gd_addr:        socket address of client
 381  *                              gd_path:        '\0'-terminated C string
 382  *                                              containing pathname of
 383  *                                              directory in local file system
 384  *                              gd_maxlen:      maximum size of returned file
 385  *                                              handle
 386  *                      size:   size in bytes of passed in nfsctl_fsparm
 387  * Output:
 388  *      On success:     passed-in buffer filled with a knfsd_fh structure
 389  *                      (a variable-length raw NFS file handle);
 390  *                      return code is the size in bytes of the file handle
 391  *      On error:       return code is negative errno value
 392  *
 393  * Note: Only AF_INET client addresses are passed in, since gd_addr
 394  * is the same size as a struct sockaddr_in.
 395  */
 396 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 397 {
 398         struct nfsctl_fsparm *data;
 399         struct sockaddr_in *sin;
 400         struct auth_domain *clp;
 401         int err = 0;
 402         struct knfsd_fh *res;
 403         struct in6_addr in6;
 404
 405         if (size < sizeof(*data))
 406                 return -EINVAL;
 407         data = (struct nfsctl_fsparm*)buf;
 408         err = -EPROTONOSUPPORT;
 409         if (data->gd_addr.sa_family != AF_INET)
 410                 goto out;
 411         sin = (struct sockaddr_in *)&data->gd_addr;
 412         if (data->gd_maxlen > NFS3_FHSIZE)
 413                 data->gd_maxlen = NFS3_FHSIZE;
 414
 415         res = (struct knfsd_fh*)buf;
 416
 417         exp_readlock();
 418
 419         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 420
 421         clp = auth_unix_lookup(&in6);
 422         if (!clp)
 423                 err = -EPERM;
 424         else {
 425                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 426                 auth_domain_put(clp);
 427         }
 428         exp_readunlock();
 429         if (err == 0)
 430                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 431  out:
 432         return err;
 433 }
 434
 435 /**
 436  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 437  *
 438  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 439  * Function remains to support old versions of nfs-utils.
 440  *
 441  * Input:
 442  *                      buf:    struct nfsctl_fdparm
 443  *                              gd_addr:        socket address of client
 444  *                              gd_path:        '\0'-terminated C string
 445  *                                              containing pathname of
 446  *                                              directory in local file system
 447  *                              gd_version:     fdparm structure version
 448  *                      size:   size in bytes of passed in nfsctl_fdparm
 449  * Output:
 450  *      On success:     passed-in buffer filled with nfsctl_res
 451  *                      (a fixed-length raw NFS file handle);
 452  *                      return code is the size in bytes of the file handle
 453  *      On error:       return code is negative errno value
 454  *
 455  * Note: Only AF_INET client addresses are passed in, since gd_addr
 456  * is the same size as a struct sockaddr_in.
 457  */
 458 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 459 {
 460         struct nfsctl_fdparm *data;
 461         struct sockaddr_in *sin;
 462         struct auth_domain *clp;
 463         int err = 0;
 464         struct knfsd_fh fh;
 465         char *res;
 466         struct in6_addr in6;
 467
 468         if (size < sizeof(*data))
 469                 return -EINVAL;
 470         data = (struct nfsctl_fdparm*)buf;
 471         err = -EPROTONOSUPPORT;
 472         if (data->gd_addr.sa_family != AF_INET)
 473                 goto out;
 474         err = -EINVAL;
 475         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 476                 goto out;
 477
 478         res = buf;
 479         sin = (struct sockaddr_in *)&data->gd_addr;
 480         exp_readlock();
 481
 482         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 483
 484         clp = auth_unix_lookup(&in6);
 485         if (!clp)
 486                 err = -EPERM;
 487         else {
 488                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 489                 auth_domain_put(clp);
 490         }
 491         exp_readunlock();
 492
 493         if (err == 0) {
 494                 memset(res,0, NFS_FHSIZE);
 495                 memcpy(res, &fh.fh_base, fh.fh_size);
 496                 err = NFS_FHSIZE;
 497         }
 498  out:
 499         return err;
 500 }
 501 #endif /* CONFIG_NFSD_DEPRECATED */
 502
 503 /**
 504  * write_unlock_ip - Release all locks used by a client
 505  *
 506  * Experimental.
 507  *
 508  * Input:
 509  *                      buf:    '\n'-terminated C string containing a
 510  *                              presentation format IP address
 511  *                      size:   length of C string in @buf
 512  * Output:
 513  *      On success:     returns zero if all specified locks were released;
 514  *                      returns one if one or more locks were not released
 515  *      On error:       return code is negative errno value
 516  */
 517 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 518 {
 519         struct sockaddr_storage address;
 520         struct sockaddr *sap = (struct sockaddr *)&address;
 521         size_t salen = sizeof(address);
 522         char *fo_path;
 523
 524         /* sanity check */
 525         if (size == 0)
 526                 return -EINVAL;
 527
 528         if (buf[size-1] != '\n')
 529                 return -EINVAL;
 530
 531         fo_path = buf;
 532         if (qword_get(&buf, fo_path, size) < 0)
 533                 return -EINVAL;
 534
 535         if (rpc_pton(fo_path, size, sap, salen) == 0)
 536                 return -EINVAL;
 537
 538         return nlmsvc_unlock_all_by_ip(sap);
 539 }
 540
 541 /**
 542  * write_unlock_fs - Release all locks on a local file system
 543  *
 544  * Experimental.
 545  *
 546  * Input:
 547  *                      buf:    '\n'-terminated C string containing the
 548  *                              absolute pathname of a local file system
 549  *                      size:   length of C string in @buf
 550  * Output:
 551  *      On success:     returns zero if all specified locks were released;
 552  *                      returns one if one or more locks were not released
 553  *      On error:       return code is negative errno value
 554  */
 555 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 556 {
 557         struct path path;
 558         char *fo_path;
 559         int error;
 560
 561         /* sanity check */
 562         if (size == 0)
 563                 return -EINVAL;
 564
 565         if (buf[size-1] != '\n')
 566                 return -EINVAL;
 567
 568         fo_path = buf;
 569         if (qword_get(&buf, fo_path, size) < 0)
 570                 return -EINVAL;
 571
 572         error = kern_path(fo_path, 0, &path);
 573         if (error)
 574                 return error;
 575
 576         /*
 577          * XXX: Needs better sanity checking.  Otherwise we could end up
 578          * releasing locks on the wrong file system.
 579          *
 580          * For example:
 581          * 1.  Does the path refer to a directory?
 582          * 2.  Is that directory a mount point, or
 583          * 3.  Is that directory the root of an exported file system?
 584          */
 585         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 586
 587         path_put(&path);
 588         return error;
 589 }
 590
 591 /**
 592  * write_filehandle - Get a variable-length NFS file handle by path
 593  *
 594  * On input, the buffer contains a '\n'-terminated C string comprised of
 595  * three alphanumeric words separated by whitespace.  The string may
 596  * contain escape sequences.
 597  *
 598  * Input:
 599  *                      buf:
 600  *                              domain:         client domain name
 601  *                              path:           export pathname
 602  *                              maxsize:        numeric maximum size of
 603  *                                              @buf
 604  *                      size:   length of C string in @buf
 605  * Output:
 606  *      On success:     passed-in buffer filled with '\n'-terminated C
 607  *                      string containing a ASCII hex text version
 608  *                      of the NFS file handle;
 609  *                      return code is the size in bytes of the string
 610  *      On error:       return code is negative errno value
 611  */
 612 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 613 {
 614         char *dname, *path;
 615         int uninitialized_var(maxsize);
 616         char *mesg = buf;
 617         int len;
 618         struct auth_domain *dom;
 619         struct knfsd_fh fh;
 620
 621         if (size == 0)
 622                 return -EINVAL;
 623
 624         if (buf[size-1] != '\n')
 625                 return -EINVAL;
 626         buf[size-1] = 0;
 627
 628         dname = mesg;
 629         len = qword_get(&mesg, dname, size);
 630         if (len <= 0)
 631                 return -EINVAL;
 632
 633         path = dname+len+1;
 634         len = qword_get(&mesg, path, size);
 635         if (len <= 0)
 636                 return -EINVAL;
 637
 638         len = get_int(&mesg, &maxsize);
 639         if (len)
 640                 return len;
 641
 642         if (maxsize < NFS_FHSIZE)
 643                 return -EINVAL;
 644         if (maxsize > NFS3_FHSIZE)
 645                 maxsize = NFS3_FHSIZE;
 646
 647         if (qword_get(&mesg, mesg, size)>0)
 648                 return -EINVAL;
 649
 650         /* we have all the words, they are in buf.. */
 651         dom = unix_domain_find(dname);
 652         if (!dom)
 653                 return -ENOMEM;
 654
 655         len = exp_rootfh(dom, path, &fh,  maxsize);
 656         auth_domain_put(dom);
 657         if (len)
 658                 return len;
 659
 660         mesg = buf;
 661         len = SIMPLE_TRANSACTION_LIMIT;
 662         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 663         mesg[-1] = '\n';
 664         return mesg - buf;
 665 }
 666
 667 /**
 668  * write_threads - Start NFSD, or report the current number of running threads
 669  *
 670  * Input:
 671  *                      buf:            ignored
 672  *                      size:           zero
 673  * Output:
 674  *      On success:     passed-in buffer filled with '\n'-terminated C
 675  *                      string numeric value representing the number of
 676  *                      running NFSD threads;
 677  *                      return code is the size in bytes of the string
 678  *      On error:       return code is zero
 679  *
 680  * OR
 681  *
 682  * Input:
 683  *                      buf:            C string containing an unsigned
 684  *                                      integer value representing the
 685  *                                      number of NFSD threads to start
 686  *                      size:           non-zero length of C string in @buf
 687  * Output:
 688  *      On success:     NFS service is started;
 689  *                      passed-in buffer filled with '\n'-terminated C
 690  *                      string numeric value representing the number of
 691  *                      running NFSD threads;
 692  *                      return code is the size in bytes of the string
 693  *      On error:       return code is zero or a negative errno value
 694  */
 695 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 696 {
 697         char *mesg = buf;
 698         int rv;
 699         if (size > 0) {
 700                 int newthreads;
 701                 rv = get_int(&mesg, &newthreads);
 702                 if (rv)
 703                         return rv;
 704                 if (newthreads < 0)
 705                         return -EINVAL;
 706                 rv = nfsd_svc(NFS_PORT, newthreads);
 707                 if (rv < 0)
 708                         return rv;
 709         } else
 710                 rv = nfsd_nrthreads();
 711
 712         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 713 }
 714
 715 /**
 716  * write_pool_threads - Set or report the current number of threads per pool
 717  *
 718  * Input:
 719  *                      buf:            ignored
 720  *                      size:           zero
 721  *
 722  * OR
 723  *
 724  * Input:
 725  *                      buf:            C string containing whitespace-
 726  *                                      separated unsigned integer values
 727  *                                      representing the number of NFSD
 728  *                                      threads to start in each pool
 729  *                      size:           non-zero length of C string in @buf
 730  * Output:
 731  *      On success:     passed-in buffer filled with '\n'-terminated C
 732  *                      string containing integer values representing the
 733  *                      number of NFSD threads in each pool;
 734  *                      return code is the size in bytes of the string
 735  *      On error:       return code is zero or a negative errno value
 736  */
 737 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 738 {
 739         /* if size > 0, look for an array of number of threads per node
 740          * and apply them  then write out number of threads per node as reply
 741          */
 742         char *mesg = buf;
 743         int i;
 744         int rv;
 745         int len;
 746         int npools;
 747         int *nthreads;
 748
 749         mutex_lock(&nfsd_mutex);
 750         npools = nfsd_nrpools();
 751         if (npools == 0) {
 752                 /*
 753                  * NFS is shut down.  The admin can start it by
 754                  * writing to the threads file but NOT the pool_threads
 755                  * file, sorry.  Report zero threads.
 756                  */
 757                 mutex_unlock(&nfsd_mutex);
 758                 strcpy(buf, "0\n");
 759                 return strlen(buf);
 760         }
 761
 762         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 763         rv = -ENOMEM;
 764         if (nthreads == NULL)
 765                 goto out_free;
 766
 767         if (size > 0) {
 768                 for (i = 0; i < npools; i++) {
 769                         rv = get_int(&mesg, &nthreads[i]);
 770                         if (rv == -ENOENT)
 771                                 break;          /* fewer numbers than pools */
 772                         if (rv)
 773                                 goto out_free;  /* syntax error */
 774                         rv = -EINVAL;
 775                         if (nthreads[i] < 0)
 776                                 goto out_free;
 777                 }
 778                 rv = nfsd_set_nrthreads(i, nthreads);
 779                 if (rv)
 780                         goto out_free;
 781         }
 782
 783         rv = nfsd_get_nrthreads(npools, nthreads);
 784         if (rv)
 785                 goto out_free;
 786
 787         mesg = buf;
 788         size = SIMPLE_TRANSACTION_LIMIT;
 789         for (i = 0; i < npools && size > 0; i++) {
 790                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 791                 len = strlen(mesg);
 792                 size -= len;
 793                 mesg += len;
 794         }
 795         rv = mesg - buf;
 796 out_free:
 797         kfree(nthreads);
 798         mutex_unlock(&nfsd_mutex);
 799         return rv;
 800 }
 801
 802 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 803 {
 804         char *mesg = buf;
 805         char *vers, *minorp, sign;
 806         int len, num, remaining;
 807         unsigned minor;
 808         ssize_t tlen = 0;
 809         char *sep;
 810
 811         if (size>0) {
 812                 if (nfsd_serv)
 813                         /* Cannot change versions without updating
 814                          * nfsd_serv->sv_xdrsize, and reallocing
 815                          * rq_argp and rq_resp
 816                          */
 817                         return -EBUSY;
 818                 if (buf[size-1] != '\n')
 819                         return -EINVAL;
 820                 buf[size-1] = 0;
 821
 822                 vers = mesg;
 823                 len = qword_get(&mesg, vers, size);
 824                 if (len <= 0) return -EINVAL;
 825                 do {
 826                         sign = *vers;
 827                         if (sign == '+' || sign == '-')
 828                                 num = simple_strtol((vers+1), &minorp, 0);
 829                         else
 830                                 num = simple_strtol(vers, &minorp, 0);
 831                         if (*minorp == '.') {
 832                                 if (num < 4)
 833                                         return -EINVAL;
 834                                 minor = simple_strtoul(minorp+1, NULL, 0);
 835                                 if (minor == 0)
 836                                         return -EINVAL;
 837                                 if (nfsd_minorversion(minor, sign == '-' ?
 838                                                      NFSD_CLEAR : NFSD_SET) < 0)
 839                                         return -EINVAL;
 840                                 goto next;
 841                         }
 842                         switch(num) {
 843                         case 2:
 844                         case 3:
 845                         case 4:
 846                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 847                                 break;
 848                         default:
 849                                 return -EINVAL;
 850                         }
 851                 next:
 852                         vers += len + 1;
 853                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 854                 /* If all get turned off, turn them back on, as
 855                  * having no versions is BAD
 856                  */
 857                 nfsd_reset_versions();
 858         }
 859
 860         /* Now write current state into reply buffer */
 861         len = 0;
 862         sep = "";
 863         remaining = SIMPLE_TRANSACTION_LIMIT;
 864         for (num=2 ; num <= 4 ; num++)
 865                 if (nfsd_vers(num, NFSD_AVAIL)) {
 866                         len = snprintf(buf, remaining, "%s%c%d", sep,
 867                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 868                                        num);
 869                         sep = " ";
 870
 871                         if (len > remaining)
 872                                 break;
 873                         remaining -= len;
 874                         buf += len;
 875                         tlen += len;
 876                 }
 877         if (nfsd_vers(4, NFSD_AVAIL))
 878                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 879                      minor++) {
 880                         len = snprintf(buf, remaining, " %c4.%u",
 881                                         (nfsd_vers(4, NFSD_TEST) &&
 882                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 883                                                 '+' : '-',
 884                                         minor);
 885
 886                         if (len > remaining)
 887                                 break;
 888                         remaining -= len;
 889                         buf += len;
 890                         tlen += len;
 891                 }
 892
 893         len = snprintf(buf, remaining, "\n");
 894         if (len > remaining)
 895                 return -EINVAL;
 896         return tlen + len;
 897 }
 898
 899 /**
 900  * write_versions - Set or report the available NFS protocol versions
 901  *
 902  * Input:
 903  *                      buf:            ignored
 904  *                      size:           zero
 905  * Output:
 906  *      On success:     passed-in buffer filled with '\n'-terminated C
 907  *                      string containing positive or negative integer
 908  *                      values representing the current status of each
 909  *                      protocol version;
 910  *                      return code is the size in bytes of the string
 911  *      On error:       return code is zero or a negative errno value
 912  *
 913  * OR
 914  *
 915  * Input:
 916  *                      buf:            C string containing whitespace-
 917  *                                      separated positive or negative
 918  *                                      integer values representing NFS
 919  *                                      protocol versions to enable ("+n")
 920  *                                      or disable ("-n")
 921  *                      size:           non-zero length of C string in @buf
 922  * Output:
 923  *      On success:     status of zero or more protocol versions has
 924  *                      been updated; passed-in buffer filled with
 925  *                      '\n'-terminated C string containing positive
 926  *                      or negative integer values representing the
 927  *                      current status of each protocol version;
 928  *                      return code is the size in bytes of the string
 929  *      On error:       return code is zero or a negative errno value
 930  */
 931 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 932 {
 933         ssize_t rv;
 934
 935         mutex_lock(&nfsd_mutex);
 936         rv = __write_versions(file, buf, size);
 937         mutex_unlock(&nfsd_mutex);
 938         return rv;
 939 }
 940
 941 /*
 942  * Zero-length write.  Return a list of NFSD's current listener
 943  * transports.
 944  */
 945 static ssize_t __write_ports_names(char *buf)
 946 {
 947         if (nfsd_serv == NULL)
 948                 return 0;
 949         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 950 }
 951
 952 /*
 953  * A single 'fd' number was written, in which case it must be for
 954  * a socket of a supported family/protocol, and we use it as an
 955  * nfsd listener.
 956  */
 957 static ssize_t __write_ports_addfd(char *buf)
 958 {
 959         char *mesg = buf;
 960         int fd, err;
 961
 962         err = get_int(&mesg, &fd);
 963         if (err != 0 || fd < 0)
 964                 return -EINVAL;
 965
 966         err = nfsd_create_serv();
 967         if (err != 0)
 968                 return err;
 969
 970         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 971         if (err < 0) {
 972                 svc_destroy(nfsd_serv);
 973                 return err;
 974         }
 975
 976         /* Decrease the count, but don't shut down the service */
 977         nfsd_serv->sv_nrthreads--;
 978         return err;
 979 }
 980
 981 /*
 982  * A '-' followed by the 'name' of a socket means we close the socket.
 983  */
 984 static ssize_t __write_ports_delfd(char *buf)
 985 {
 986         char *toclose;
 987         int len = 0;
 988
 989         toclose = kstrdup(buf + 1, GFP_KERNEL);
 990         if (toclose == NULL)
 991                 return -ENOMEM;
 992
 993         if (nfsd_serv != NULL)
 994                 len = svc_sock_names(nfsd_serv, buf,
 995                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 996         kfree(toclose);
 997         return len;
 998 }
 999
1000 /*
1001  * A transport listener is added by writing it's transport name and
1002  * a port number.
1003  */
1004 static ssize_t __write_ports_addxprt(char *buf)
1005 {
1006         char transport[16];
1007         struct svc_xprt *xprt;
1008         int port, err;
1009
1010         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1011                 return -EINVAL;
1012
1013         if (port < 1 || port > USHRT_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                 goto out_err;
1024
1025         err = svc_create_xprt(nfsd_serv, transport,
1026                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1027         if (err < 0 && err != -EAFNOSUPPORT)
1028                 goto out_close;
1029
1030         /* Decrease the count, but don't shut down the service */
1031         nfsd_serv->sv_nrthreads--;
1032         return 0;
1033 out_close:
1034         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1035         if (xprt != NULL) {
1036                 svc_close_xprt(xprt);
1037                 svc_xprt_put(xprt);
1038         }
1039 out_err:
1040         svc_destroy(nfsd_serv);
1041         return err;
1042 }
1043
1044 /*
1045  * A transport listener is removed by writing a "-", it's transport
1046  * name, and it's port number.
1047  */
1048 static ssize_t __write_ports_delxprt(char *buf)
1049 {
1050         struct svc_xprt *xprt;
1051         char transport[16];
1052         int port;
1053
1054         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1055                 return -EINVAL;
1056
1057         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1058                 return -EINVAL;
1059
1060         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1061         if (xprt == NULL)
1062                 return -ENOTCONN;
1063
1064         svc_close_xprt(xprt);
1065         svc_xprt_put(xprt);
1066         return 0;
1067 }
1068
1069 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1070 {
1071         if (size == 0)
1072                 return __write_ports_names(buf);
1073
1074         if (isdigit(buf[0]))
1075                 return __write_ports_addfd(buf);
1076
1077         if (buf[0] == '-' && isdigit(buf[1]))
1078                 return __write_ports_delfd(buf);
1079
1080         if (isalpha(buf[0]))
1081                 return __write_ports_addxprt(buf);
1082
1083         if (buf[0] == '-' && isalpha(buf[1]))
1084                 return __write_ports_delxprt(buf);
1085
1086         return -EINVAL;
1087 }
1088
1089 /**
1090  * write_ports - Pass a socket file descriptor or transport name to listen on
1091  *
1092  * Input:
1093  *                      buf:            ignored
1094  *                      size:           zero
1095  * Output:
1096  *      On success:     passed-in buffer filled with a '\n'-terminated C
1097  *                      string containing a whitespace-separated list of
1098  *                      named NFSD listeners;
1099  *                      return code is the size in bytes of the string
1100  *      On error:       return code is zero or a negative errno value
1101  *
1102  * OR
1103  *
1104  * Input:
1105  *                      buf:            C string containing an unsigned
1106  *                                      integer value representing a bound
1107  *                                      but unconnected socket that is to be
1108  *                                      used as an NFSD listener; listen(3)
1109  *                                      must be called for a SOCK_STREAM
1110  *                                      socket, otherwise it is ignored
1111  *                      size:           non-zero length of C string in @buf
1112  * Output:
1113  *      On success:     NFS service is started;
1114  *                      passed-in buffer filled with a '\n'-terminated C
1115  *                      string containing a unique alphanumeric name of
1116  *                      the listener;
1117  *                      return code is the size in bytes of the string
1118  *      On error:       return code is a negative errno value
1119  *
1120  * OR
1121  *
1122  * Input:
1123  *                      buf:            C string containing a "-" followed
1124  *                                      by an integer value representing a
1125  *                                      previously passed in socket file
1126  *                                      descriptor
1127  *                      size:           non-zero length of C string in @buf
1128  * Output:
1129  *      On success:     NFS service no longer listens on that socket;
1130  *                      passed-in buffer filled with a '\n'-terminated C
1131  *                      string containing a unique name of the listener;
1132  *                      return code is the size in bytes of the string
1133  *      On error:       return code is a negative errno value
1134  *
1135  * OR
1136  *
1137  * Input:
1138  *                      buf:            C string containing a transport
1139  *                                      name and an unsigned integer value
1140  *                                      representing the port to listen on,
1141  *                                      separated by whitespace
1142  *                      size:           non-zero length of C string in @buf
1143  * Output:
1144  *      On success:     returns zero; NFS service is started
1145  *      On error:       return code is a negative errno value
1146  *
1147  * OR
1148  *
1149  * Input:
1150  *                      buf:            C string containing a "-" followed
1151  *                                      by a transport name and an unsigned
1152  *                                      integer value representing the port
1153  *                                      to listen on, separated by whitespace
1154  *                      size:           non-zero length of C string in @buf
1155  * Output:
1156  *      On success:     returns zero; NFS service no longer listens
1157  *                      on that transport
1158  *      On error:       return code is a negative errno value
1159  */
1160 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1161 {
1162         ssize_t rv;
1163
1164         mutex_lock(&nfsd_mutex);
1165         rv = __write_ports(file, buf, size);
1166         mutex_unlock(&nfsd_mutex);
1167         return rv;
1168 }
1169
1170
1171 int nfsd_max_blksize;
1172
1173 /**
1174  * write_maxblksize - Set or report the current NFS blksize
1175  *
1176  * Input:
1177  *                      buf:            ignored
1178  *                      size:           zero
1179  *
1180  * OR
1181  *
1182  * Input:
1183  *                      buf:            C string containing an unsigned
1184  *                                      integer value representing the new
1185  *                                      NFS blksize
1186  *                      size:           non-zero length of C string in @buf
1187  * Output:
1188  *      On success:     passed-in buffer filled with '\n'-terminated C string
1189  *                      containing numeric value of the current NFS blksize
1190  *                      setting;
1191  *                      return code is the size in bytes of the string
1192  *      On error:       return code is zero or a negative errno value
1193  */
1194 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1195 {
1196         char *mesg = buf;
1197         if (size > 0) {
1198                 int bsize;
1199                 int rv = get_int(&mesg, &bsize);
1200                 if (rv)
1201                         return rv;
1202                 /* force bsize into allowed range and
1203                  * required alignment.
1204                  */
1205                 if (bsize < 1024)
1206                         bsize = 1024;
1207                 if (bsize > NFSSVC_MAXBLKSIZE)
1208                         bsize = NFSSVC_MAXBLKSIZE;
1209                 bsize &= ~(1024-1);
1210                 mutex_lock(&nfsd_mutex);
1211                 if (nfsd_serv) {
1212                         mutex_unlock(&nfsd_mutex);
1213                         return -EBUSY;
1214                 }
1215                 nfsd_max_blksize = bsize;
1216                 mutex_unlock(&nfsd_mutex);
1217         }
1218
1219         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1220                                                         nfsd_max_blksize);
1221 }
1222
1223 #ifdef CONFIG_NFSD_V4
1224 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1225 {
1226         char *mesg = buf;
1227         int rv, i;
1228
1229         if (size > 0) {
1230                 if (nfsd_serv)
1231                         return -EBUSY;
1232                 rv = get_int(&mesg, &i);
1233                 if (rv)
1234                         return rv;
1235                 /*
1236                  * Some sanity checking.  We don't have a reason for
1237                  * these particular numbers, but problems with the
1238                  * extremes are:
1239                  *      - Too short: the briefest network outage may
1240                  *        cause clients to lose all their locks.  Also,
1241                  *        the frequent polling may be wasteful.
1242                  *      - Too long: do you really want reboot recovery
1243                  *        to take more than an hour?  Or to make other
1244                  *        clients wait an hour before being able to
1245                  *        revoke a dead client's locks?
1246                  */
1247                 if (i < 10 || i > 3600)
1248                         return -EINVAL;
1249                 *time = i;
1250         }
1251
1252         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1253 }
1254
1255 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1256 {
1257         ssize_t rv;
1258
1259         mutex_lock(&nfsd_mutex);
1260         rv = __nfsd4_write_time(file, buf, size, time);
1261         mutex_unlock(&nfsd_mutex);
1262         return rv;
1263 }
1264
1265 /**
1266  * write_leasetime - Set or report the current NFSv4 lease time
1267  *
1268  * Input:
1269  *                      buf:            ignored
1270  *                      size:           zero
1271  *
1272  * OR
1273  *
1274  * Input:
1275  *                      buf:            C string containing an unsigned
1276  *                                      integer value representing the new
1277  *                                      NFSv4 lease expiry time
1278  *                      size:           non-zero length of C string in @buf
1279  * Output:
1280  *      On success:     passed-in buffer filled with '\n'-terminated C
1281  *                      string containing unsigned integer value of the
1282  *                      current lease expiry time;
1283  *                      return code is the size in bytes of the string
1284  *      On error:       return code is zero or a negative errno value
1285  */
1286 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1287 {
1288         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1289 }
1290
1291 /**
1292  * write_gracetime - Set or report current NFSv4 grace period time
1293  *
1294  * As above, but sets the time of the NFSv4 grace period.
1295  *
1296  * Note this should never be set to less than the *previous*
1297  * lease-period time, but we don't try to enforce this.  (In the common
1298  * case (a new boot), we don't know what the previous lease time was
1299  * anyway.)
1300  */
1301 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1302 {
1303         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1304 }
1305
1306 extern char *nfs4_recoverydir(void);
1307
1308 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1309 {
1310         char *mesg = buf;
1311         char *recdir;
1312         int len, status;
1313
1314         if (size > 0) {
1315                 if (nfsd_serv)
1316                         return -EBUSY;
1317                 if (size > PATH_MAX || buf[size-1] != '\n')
1318                         return -EINVAL;
1319                 buf[size-1] = 0;
1320
1321                 recdir = mesg;
1322                 len = qword_get(&mesg, recdir, size);
1323                 if (len <= 0)
1324                         return -EINVAL;
1325
1326                 status = nfs4_reset_recoverydir(recdir);
1327                 if (status)
1328                         return status;
1329         }
1330
1331         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1332                                                         nfs4_recoverydir());
1333 }
1334
1335 /**
1336  * write_recoverydir - Set or report the pathname of the recovery directory
1337  *
1338  * Input:
1339  *                      buf:            ignored
1340  *                      size:           zero
1341  *
1342  * OR
1343  *
1344  * Input:
1345  *                      buf:            C string containing the pathname
1346  *                                      of the directory on a local file
1347  *                                      system containing permanent NFSv4
1348  *                                      recovery data
1349  *                      size:           non-zero length of C string in @buf
1350  * Output:
1351  *      On success:     passed-in buffer filled with '\n'-terminated C string
1352  *                      containing the current recovery pathname setting;
1353  *                      return code is the size in bytes of the string
1354  *      On error:       return code is zero or a negative errno value
1355  */
1356 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1357 {
1358         ssize_t rv;
1359
1360         mutex_lock(&nfsd_mutex);
1361         rv = __write_recoverydir(file, buf, size);
1362         mutex_unlock(&nfsd_mutex);
1363         return rv;
1364 }
1365
1366 #endif
1367
1368 /*----------------------------------------------------------------------------*/
1369 /*
1370  *      populating the filesystem.
1371  */
1372
1373 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1374 {
1375         static struct tree_descr nfsd_files[] = {
1376 #ifdef CONFIG_NFSD_DEPRECATED
1377                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1378                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1379                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1380                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1381                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1382                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1383                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1384 #endif
1385                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1386                 [NFSD_Export_features] = {"export_features",
1387                                         &export_features_operations, S_IRUGO},
1388                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1389                                         &transaction_ops, S_IWUSR|S_IRUSR},
1390                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1391                                         &transaction_ops, S_IWUSR|S_IRUSR},
1392                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1393                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1394                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1395                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1396                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1397                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1398                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1399 #ifdef CONFIG_NFSD_V4
1400                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1401                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1402                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1403 #endif
1404                 /* last one */ {""}
1405         };
1406         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1407 }
1408
1409 static int nfsd_get_sb(struct file_system_type *fs_type,
1410         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1411 {
1412         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1413 }
1414
1415 static struct file_system_type nfsd_fs_type = {
1416         .owner          = THIS_MODULE,
1417         .name           = "nfsd",
1418         .get_sb         = nfsd_get_sb,
1419         .kill_sb        = kill_litter_super,
1420 };
1421
1422 #ifdef CONFIG_PROC_FS
1423 static int create_proc_exports_entry(void)
1424 {
1425         struct proc_dir_entry *entry;
1426
1427         entry = proc_mkdir("fs/nfs", NULL);
1428         if (!entry)
1429                 return -ENOMEM;
1430         entry = proc_create("exports", 0, entry, &exports_operations);
1431         if (!entry)
1432                 return -ENOMEM;
1433         return 0;
1434 }
1435 #else /* CONFIG_PROC_FS */
1436 static int create_proc_exports_entry(void)
1437 {
1438         return 0;
1439 }
1440 #endif
1441
1442 static int __init init_nfsd(void)
1443 {
1444         int retval;
1445         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1446
1447         retval = nfs4_state_init(); /* nfs4 locking state */
1448         if (retval)
1449                 return retval;
1450         nfsd_stat_init();       /* Statistics */
1451         retval = nfsd_reply_cache_init();
1452         if (retval)
1453                 goto out_free_stat;
1454         retval = nfsd_export_init();
1455         if (retval)
1456                 goto out_free_cache;
1457         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1458         retval = nfsd_idmap_init();
1459         if (retval)
1460                 goto out_free_lockd;
1461         retval = create_proc_exports_entry();
1462         if (retval)
1463                 goto out_free_idmap;
1464         retval = register_filesystem(&nfsd_fs_type);
1465         if (retval)
1466                 goto out_free_all;
1467         return 0;
1468 out_free_all:
1469         remove_proc_entry("fs/nfs/exports", NULL);
1470         remove_proc_entry("fs/nfs", NULL);
1471 out_free_idmap:
1472         nfsd_idmap_shutdown();
1473 out_free_lockd:
1474         nfsd_lockd_shutdown();
1475         nfsd_export_shutdown();
1476 out_free_cache:
1477         nfsd_reply_cache_shutdown();
1478 out_free_stat:
1479         nfsd_stat_shutdown();
1480         nfsd4_free_slabs();
1481         return retval;
1482 }
1483
1484 static void __exit exit_nfsd(void)
1485 {
1486         nfsd_export_shutdown();
1487         nfsd_reply_cache_shutdown();
1488         remove_proc_entry("fs/nfs/exports", NULL);
1489         remove_proc_entry("fs/nfs", NULL);
1490         nfsd_stat_shutdown();
1491         nfsd_lockd_shutdown();
1492         nfsd_idmap_shutdown();
1493         nfsd4_free_slabs();
1494         unregister_filesystem(&nfsd_fs_type);
1495 }
1496
1497 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1498 MODULE_LICENSE("GPL");
1499 module_init(init_nfsd)
1500 module_exit(exit_nfsd)