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/sunrpc/svcsock.h>
  12 #include <linux/nfsd/syscall.h>
  13 #include <linux/lockd/lockd.h>
  14 #include <linux/sunrpc/clnt.h>
  15
  16 #include "idmap.h"
  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 #ifdef CONFIG_NFSD_DEPRECATED
 131         static int warned;
 132         if (file->f_dentry->d_name.name[0] == '.' && !warned) {
 133                 printk(KERN_INFO
 134                        "Warning: \"%s\" uses deprecated NFSD interface: %s."
 135                        "  This will be removed in 2.6.40\n",
 136                        current->comm, file->f_dentry->d_name.name);
 137                 warned = 1;
 138         }
 139 #endif
 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         .llseek         = default_llseek,
 157 };
 158
 159 static int exports_open(struct inode *inode, struct file *file)
 160 {
 161         return seq_open(file, &nfs_exports_op);
 162 }
 163
 164 static const struct file_operations exports_operations = {
 165         .open           = exports_open,
 166         .read           = seq_read,
 167         .llseek         = seq_lseek,
 168         .release        = seq_release,
 169         .owner          = THIS_MODULE,
 170 };
 171
 172 static int export_features_show(struct seq_file *m, void *v)
 173 {
 174         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 175         return 0;
 176 }
 177
 178 static int export_features_open(struct inode *inode, struct file *file)
 179 {
 180         return single_open(file, export_features_show, NULL);
 181 }
 182
 183 static struct file_operations export_features_operations = {
 184         .open           = export_features_open,
 185         .read           = seq_read,
 186         .llseek         = seq_lseek,
 187         .release        = single_release,
 188 };
 189
 190 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 191 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 192
 193 static const struct file_operations pool_stats_operations = {
 194         .open           = nfsd_pool_stats_open,
 195         .read           = seq_read,
 196         .llseek         = seq_lseek,
 197         .release        = nfsd_pool_stats_release,
 198         .owner          = THIS_MODULE,
 199 };
 200
 201 /*----------------------------------------------------------------------------*/
 202 /*
 203  * payload - write methods
 204  */
 205
 206 #ifdef CONFIG_NFSD_DEPRECATED
 207 /**
 208  * write_svc - Start kernel's NFSD server
 209  *
 210  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 211  * Function remains to support old versions of nfs-utils.
 212  *
 213  * Input:
 214  *                      buf:    struct nfsctl_svc
 215  *                              svc_port:       port number of this
 216  *                                              server's listener
 217  *                              svc_nthreads:   number of threads to start
 218  *                      size:   size in bytes of passed in nfsctl_svc
 219  * Output:
 220  *      On success:     returns zero
 221  *      On error:       return code is negative errno value
 222  */
 223 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 224 {
 225         struct nfsctl_svc *data;
 226         int err;
 227         if (size < sizeof(*data))
 228                 return -EINVAL;
 229         data = (struct nfsctl_svc*) buf;
 230         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 231         if (err < 0)
 232                 return err;
 233         return 0;
 234 }
 235
 236 /**
 237  * write_add - Add or modify client entry in auth unix cache
 238  *
 239  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 240  * Function remains to support old versions of nfs-utils.
 241  *
 242  * Input:
 243  *                      buf:    struct nfsctl_client
 244  *                              cl_ident:       '\0'-terminated C string
 245  *                                              containing domain name
 246  *                                              of client
 247  *                              cl_naddr:       no. of items in cl_addrlist
 248  *                              cl_addrlist:    array of client addresses
 249  *                              cl_fhkeytype:   ignored
 250  *                              cl_fhkeylen:    ignored
 251  *                              cl_fhkey:       ignored
 252  *                      size:   size in bytes of passed in nfsctl_client
 253  * Output:
 254  *      On success:     returns zero
 255  *      On error:       return code is negative errno value
 256  *
 257  * Note: Only AF_INET client addresses are passed in, since
 258  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 259  */
 260 static ssize_t write_add(struct file *file, char *buf, size_t size)
 261 {
 262         struct nfsctl_client *data;
 263         if (size < sizeof(*data))
 264                 return -EINVAL;
 265         data = (struct nfsctl_client *)buf;
 266         return exp_addclient(data);
 267 }
 268
 269 /**
 270  * write_del - Remove client from auth unix cache
 271  *
 272  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 273  * Function remains to support old versions of nfs-utils.
 274  *
 275  * Input:
 276  *                      buf:    struct nfsctl_client
 277  *                              cl_ident:       '\0'-terminated C string
 278  *                                              containing domain name
 279  *                                              of client
 280  *                              cl_naddr:       ignored
 281  *                              cl_addrlist:    ignored
 282  *                              cl_fhkeytype:   ignored
 283  *                              cl_fhkeylen:    ignored
 284  *                              cl_fhkey:       ignored
 285  *                      size:   size in bytes of passed in nfsctl_client
 286  * Output:
 287  *      On success:     returns zero
 288  *      On error:       return code is negative errno value
 289  *
 290  * Note: Only AF_INET client addresses are passed in, since
 291  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 292  */
 293 static ssize_t write_del(struct file *file, char *buf, size_t size)
 294 {
 295         struct nfsctl_client *data;
 296         if (size < sizeof(*data))
 297                 return -EINVAL;
 298         data = (struct nfsctl_client *)buf;
 299         return exp_delclient(data);
 300 }
 301
 302 /**
 303  * write_export - Export part or all of a local file system
 304  *
 305  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 306  * Function remains to support old versions of nfs-utils.
 307  *
 308  * Input:
 309  *                      buf:    struct nfsctl_export
 310  *                              ex_client:      '\0'-terminated C string
 311  *                                              containing domain name
 312  *                                              of client allowed to access
 313  *                                              this export
 314  *                              ex_path:        '\0'-terminated C string
 315  *                                              containing pathname of
 316  *                                              directory in local file system
 317  *                              ex_dev:         fsid to use for this export
 318  *                              ex_ino:         ignored
 319  *                              ex_flags:       export flags for this export
 320  *                              ex_anon_uid:    UID to use for anonymous
 321  *                                              requests
 322  *                              ex_anon_gid:    GID to use for anonymous
 323  *                                              requests
 324  *                      size:   size in bytes of passed in nfsctl_export
 325  * Output:
 326  *      On success:     returns zero
 327  *      On error:       return code is negative errno value
 328  */
 329 static ssize_t write_export(struct file *file, char *buf, size_t size)
 330 {
 331         struct nfsctl_export *data;
 332         if (size < sizeof(*data))
 333                 return -EINVAL;
 334         data = (struct nfsctl_export*)buf;
 335         return exp_export(data);
 336 }
 337
 338 /**
 339  * write_unexport - Unexport a previously exported file system
 340  *
 341  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 342  * Function remains to support old versions of nfs-utils.
 343  *
 344  * Input:
 345  *                      buf:    struct nfsctl_export
 346  *                              ex_client:      '\0'-terminated C string
 347  *                                              containing domain name
 348  *                                              of client no longer allowed
 349  *                                              to access this export
 350  *                              ex_path:        '\0'-terminated C string
 351  *                                              containing pathname of
 352  *                                              directory in local file system
 353  *                              ex_dev:         ignored
 354  *                              ex_ino:         ignored
 355  *                              ex_flags:       ignored
 356  *                              ex_anon_uid:    ignored
 357  *                              ex_anon_gid:    ignored
 358  *                      size:   size in bytes of passed in nfsctl_export
 359  * Output:
 360  *      On success:     returns zero
 361  *      On error:       return code is negative errno value
 362  */
 363 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 364 {
 365         struct nfsctl_export *data;
 366
 367         if (size < sizeof(*data))
 368                 return -EINVAL;
 369         data = (struct nfsctl_export*)buf;
 370         return exp_unexport(data);
 371 }
 372
 373 /**
 374  * write_getfs - Get a variable-length NFS file handle by path
 375  *
 376  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 377  * Function remains to support old versions of nfs-utils.
 378  *
 379  * Input:
 380  *                      buf:    struct nfsctl_fsparm
 381  *                              gd_addr:        socket address of client
 382  *                              gd_path:        '\0'-terminated C string
 383  *                                              containing pathname of
 384  *                                              directory in local file system
 385  *                              gd_maxlen:      maximum size of returned file
 386  *                                              handle
 387  *                      size:   size in bytes of passed in nfsctl_fsparm
 388  * Output:
 389  *      On success:     passed-in buffer filled with a knfsd_fh structure
 390  *                      (a variable-length raw NFS file handle);
 391  *                      return code is the size in bytes of the file handle
 392  *      On error:       return code is negative errno value
 393  *
 394  * Note: Only AF_INET client addresses are passed in, since gd_addr
 395  * is the same size as a struct sockaddr_in.
 396  */
 397 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 398 {
 399         struct nfsctl_fsparm *data;
 400         struct sockaddr_in *sin;
 401         struct auth_domain *clp;
 402         int err = 0;
 403         struct knfsd_fh *res;
 404         struct in6_addr in6;
 405
 406         if (size < sizeof(*data))
 407                 return -EINVAL;
 408         data = (struct nfsctl_fsparm*)buf;
 409         err = -EPROTONOSUPPORT;
 410         if (data->gd_addr.sa_family != AF_INET)
 411                 goto out;
 412         sin = (struct sockaddr_in *)&data->gd_addr;
 413         if (data->gd_maxlen > NFS3_FHSIZE)
 414                 data->gd_maxlen = NFS3_FHSIZE;
 415
 416         res = (struct knfsd_fh*)buf;
 417
 418         exp_readlock();
 419
 420         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 421
 422         clp = auth_unix_lookup(&init_net, &in6);
 423         if (!clp)
 424                 err = -EPERM;
 425         else {
 426                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 427                 auth_domain_put(clp);
 428         }
 429         exp_readunlock();
 430         if (err == 0)
 431                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 432  out:
 433         return err;
 434 }
 435
 436 /**
 437  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 438  *
 439  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 440  * Function remains to support old versions of nfs-utils.
 441  *
 442  * Input:
 443  *                      buf:    struct nfsctl_fdparm
 444  *                              gd_addr:        socket address of client
 445  *                              gd_path:        '\0'-terminated C string
 446  *                                              containing pathname of
 447  *                                              directory in local file system
 448  *                              gd_version:     fdparm structure version
 449  *                      size:   size in bytes of passed in nfsctl_fdparm
 450  * Output:
 451  *      On success:     passed-in buffer filled with nfsctl_res
 452  *                      (a fixed-length raw NFS file handle);
 453  *                      return code is the size in bytes of the file handle
 454  *      On error:       return code is negative errno value
 455  *
 456  * Note: Only AF_INET client addresses are passed in, since gd_addr
 457  * is the same size as a struct sockaddr_in.
 458  */
 459 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 460 {
 461         struct nfsctl_fdparm *data;
 462         struct sockaddr_in *sin;
 463         struct auth_domain *clp;
 464         int err = 0;
 465         struct knfsd_fh fh;
 466         char *res;
 467         struct in6_addr in6;
 468
 469         if (size < sizeof(*data))
 470                 return -EINVAL;
 471         data = (struct nfsctl_fdparm*)buf;
 472         err = -EPROTONOSUPPORT;
 473         if (data->gd_addr.sa_family != AF_INET)
 474                 goto out;
 475         err = -EINVAL;
 476         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 477                 goto out;
 478
 479         res = buf;
 480         sin = (struct sockaddr_in *)&data->gd_addr;
 481         exp_readlock();
 482
 483         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 484
 485         clp = auth_unix_lookup(&init_net, &in6);
 486         if (!clp)
 487                 err = -EPERM;
 488         else {
 489                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 490                 auth_domain_put(clp);
 491         }
 492         exp_readunlock();
 493
 494         if (err == 0) {
 495                 memset(res,0, NFS_FHSIZE);
 496                 memcpy(res, &fh.fh_base, fh.fh_size);
 497                 err = NFS_FHSIZE;
 498         }
 499  out:
 500         return err;
 501 }
 502 #endif /* CONFIG_NFSD_DEPRECATED */
 503
 504 /**
 505  * write_unlock_ip - Release all locks used by a client
 506  *
 507  * Experimental.
 508  *
 509  * Input:
 510  *                      buf:    '\n'-terminated C string containing a
 511  *                              presentation format IP address
 512  *                      size:   length of C string in @buf
 513  * Output:
 514  *      On success:     returns zero if all specified locks were released;
 515  *                      returns one if one or more locks were not released
 516  *      On error:       return code is negative errno value
 517  */
 518 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 519 {
 520         struct sockaddr_storage address;
 521         struct sockaddr *sap = (struct sockaddr *)&address;
 522         size_t salen = sizeof(address);
 523         char *fo_path;
 524
 525         /* sanity check */
 526         if (size == 0)
 527                 return -EINVAL;
 528
 529         if (buf[size-1] != '\n')
 530                 return -EINVAL;
 531
 532         fo_path = buf;
 533         if (qword_get(&buf, fo_path, size) < 0)
 534                 return -EINVAL;
 535
 536         if (rpc_pton(fo_path, size, sap, salen) == 0)
 537                 return -EINVAL;
 538
 539         return nlmsvc_unlock_all_by_ip(sap);
 540 }
 541
 542 /**
 543  * write_unlock_fs - Release all locks on a local file system
 544  *
 545  * Experimental.
 546  *
 547  * Input:
 548  *                      buf:    '\n'-terminated C string containing the
 549  *                              absolute pathname of a local file system
 550  *                      size:   length of C string in @buf
 551  * Output:
 552  *      On success:     returns zero if all specified locks were released;
 553  *                      returns one if one or more locks were not released
 554  *      On error:       return code is negative errno value
 555  */
 556 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 557 {
 558         struct path path;
 559         char *fo_path;
 560         int error;
 561
 562         /* sanity check */
 563         if (size == 0)
 564                 return -EINVAL;
 565
 566         if (buf[size-1] != '\n')
 567                 return -EINVAL;
 568
 569         fo_path = buf;
 570         if (qword_get(&buf, fo_path, size) < 0)
 571                 return -EINVAL;
 572
 573         error = kern_path(fo_path, 0, &path);
 574         if (error)
 575                 return error;
 576
 577         /*
 578          * XXX: Needs better sanity checking.  Otherwise we could end up
 579          * releasing locks on the wrong file system.
 580          *
 581          * For example:
 582          * 1.  Does the path refer to a directory?
 583          * 2.  Is that directory a mount point, or
 584          * 3.  Is that directory the root of an exported file system?
 585          */
 586         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 587
 588         path_put(&path);
 589         return error;
 590 }
 591
 592 /**
 593  * write_filehandle - Get a variable-length NFS file handle by path
 594  *
 595  * On input, the buffer contains a '\n'-terminated C string comprised of
 596  * three alphanumeric words separated by whitespace.  The string may
 597  * contain escape sequences.
 598  *
 599  * Input:
 600  *                      buf:
 601  *                              domain:         client domain name
 602  *                              path:           export pathname
 603  *                              maxsize:        numeric maximum size of
 604  *                                              @buf
 605  *                      size:   length of C string in @buf
 606  * Output:
 607  *      On success:     passed-in buffer filled with '\n'-terminated C
 608  *                      string containing a ASCII hex text version
 609  *                      of the NFS file handle;
 610  *                      return code is the size in bytes of the string
 611  *      On error:       return code is negative errno value
 612  */
 613 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 614 {
 615         char *dname, *path;
 616         int uninitialized_var(maxsize);
 617         char *mesg = buf;
 618         int len;
 619         struct auth_domain *dom;
 620         struct knfsd_fh fh;
 621
 622         if (size == 0)
 623                 return -EINVAL;
 624
 625         if (buf[size-1] != '\n')
 626                 return -EINVAL;
 627         buf[size-1] = 0;
 628
 629         dname = mesg;
 630         len = qword_get(&mesg, dname, size);
 631         if (len <= 0)
 632                 return -EINVAL;
 633
 634         path = dname+len+1;
 635         len = qword_get(&mesg, path, size);
 636         if (len <= 0)
 637                 return -EINVAL;
 638
 639         len = get_int(&mesg, &maxsize);
 640         if (len)
 641                 return len;
 642
 643         if (maxsize < NFS_FHSIZE)
 644                 return -EINVAL;
 645         if (maxsize > NFS3_FHSIZE)
 646                 maxsize = NFS3_FHSIZE;
 647
 648         if (qword_get(&mesg, mesg, size)>0)
 649                 return -EINVAL;
 650
 651         /* we have all the words, they are in buf.. */
 652         dom = unix_domain_find(dname);
 653         if (!dom)
 654                 return -ENOMEM;
 655
 656         len = exp_rootfh(dom, path, &fh,  maxsize);
 657         auth_domain_put(dom);
 658         if (len)
 659                 return len;
 660
 661         mesg = buf;
 662         len = SIMPLE_TRANSACTION_LIMIT;
 663         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 664         mesg[-1] = '\n';
 665         return mesg - buf;
 666 }
 667
 668 /**
 669  * write_threads - Start NFSD, or report the current number of running threads
 670  *
 671  * Input:
 672  *                      buf:            ignored
 673  *                      size:           zero
 674  * Output:
 675  *      On success:     passed-in buffer filled with '\n'-terminated C
 676  *                      string numeric value representing the number of
 677  *                      running NFSD threads;
 678  *                      return code is the size in bytes of the string
 679  *      On error:       return code is zero
 680  *
 681  * OR
 682  *
 683  * Input:
 684  *                      buf:            C string containing an unsigned
 685  *                                      integer value representing the
 686  *                                      number of NFSD threads to start
 687  *                      size:           non-zero length of C string in @buf
 688  * Output:
 689  *      On success:     NFS service is started;
 690  *                      passed-in buffer filled with '\n'-terminated C
 691  *                      string numeric value representing the number of
 692  *                      running NFSD threads;
 693  *                      return code is the size in bytes of the string
 694  *      On error:       return code is zero or a negative errno value
 695  */
 696 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 697 {
 698         char *mesg = buf;
 699         int rv;
 700         if (size > 0) {
 701                 int newthreads;
 702                 rv = get_int(&mesg, &newthreads);
 703                 if (rv)
 704                         return rv;
 705                 if (newthreads < 0)
 706                         return -EINVAL;
 707                 rv = nfsd_svc(NFS_PORT, newthreads);
 708                 if (rv < 0)
 709                         return rv;
 710         } else
 711                 rv = nfsd_nrthreads();
 712
 713         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 714 }
 715
 716 /**
 717  * write_pool_threads - Set or report the current number of threads per pool
 718  *
 719  * Input:
 720  *                      buf:            ignored
 721  *                      size:           zero
 722  *
 723  * OR
 724  *
 725  * Input:
 726  *                      buf:            C string containing whitespace-
 727  *                                      separated unsigned integer values
 728  *                                      representing the number of NFSD
 729  *                                      threads to start in each pool
 730  *                      size:           non-zero length of C string in @buf
 731  * Output:
 732  *      On success:     passed-in buffer filled with '\n'-terminated C
 733  *                      string containing integer values representing the
 734  *                      number of NFSD threads in each pool;
 735  *                      return code is the size in bytes of the string
 736  *      On error:       return code is zero or a negative errno value
 737  */
 738 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 739 {
 740         /* if size > 0, look for an array of number of threads per node
 741          * and apply them  then write out number of threads per node as reply
 742          */
 743         char *mesg = buf;
 744         int i;
 745         int rv;
 746         int len;
 747         int npools;
 748         int *nthreads;
 749
 750         mutex_lock(&nfsd_mutex);
 751         npools = nfsd_nrpools();
 752         if (npools == 0) {
 753                 /*
 754                  * NFS is shut down.  The admin can start it by
 755                  * writing to the threads file but NOT the pool_threads
 756                  * file, sorry.  Report zero threads.
 757                  */
 758                 mutex_unlock(&nfsd_mutex);
 759                 strcpy(buf, "0\n");
 760                 return strlen(buf);
 761         }
 762
 763         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 764         rv = -ENOMEM;
 765         if (nthreads == NULL)
 766                 goto out_free;
 767
 768         if (size > 0) {
 769                 for (i = 0; i < npools; i++) {
 770                         rv = get_int(&mesg, &nthreads[i]);
 771                         if (rv == -ENOENT)
 772                                 break;          /* fewer numbers than pools */
 773                         if (rv)
 774                                 goto out_free;  /* syntax error */
 775                         rv = -EINVAL;
 776                         if (nthreads[i] < 0)
 777                                 goto out_free;
 778                 }
 779                 rv = nfsd_set_nrthreads(i, nthreads);
 780                 if (rv)
 781                         goto out_free;
 782         }
 783
 784         rv = nfsd_get_nrthreads(npools, nthreads);
 785         if (rv)
 786                 goto out_free;
 787
 788         mesg = buf;
 789         size = SIMPLE_TRANSACTION_LIMIT;
 790         for (i = 0; i < npools && size > 0; i++) {
 791                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 792                 len = strlen(mesg);
 793                 size -= len;
 794                 mesg += len;
 795         }
 796         rv = mesg - buf;
 797 out_free:
 798         kfree(nthreads);
 799         mutex_unlock(&nfsd_mutex);
 800         return rv;
 801 }
 802
 803 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 804 {
 805         char *mesg = buf;
 806         char *vers, *minorp, sign;
 807         int len, num, remaining;
 808         unsigned minor;
 809         ssize_t tlen = 0;
 810         char *sep;
 811
 812         if (size>0) {
 813                 if (nfsd_serv)
 814                         /* Cannot change versions without updating
 815                          * nfsd_serv->sv_xdrsize, and reallocing
 816                          * rq_argp and rq_resp
 817                          */
 818                         return -EBUSY;
 819                 if (buf[size-1] != '\n')
 820                         return -EINVAL;
 821                 buf[size-1] = 0;
 822
 823                 vers = mesg;
 824                 len = qword_get(&mesg, vers, size);
 825                 if (len <= 0) return -EINVAL;
 826                 do {
 827                         sign = *vers;
 828                         if (sign == '+' || sign == '-')
 829                                 num = simple_strtol((vers+1), &minorp, 0);
 830                         else
 831                                 num = simple_strtol(vers, &minorp, 0);
 832                         if (*minorp == '.') {
 833                                 if (num < 4)
 834                                         return -EINVAL;
 835                                 minor = simple_strtoul(minorp+1, NULL, 0);
 836                                 if (minor == 0)
 837                                         return -EINVAL;
 838                                 if (nfsd_minorversion(minor, sign == '-' ?
 839                                                      NFSD_CLEAR : NFSD_SET) < 0)
 840                                         return -EINVAL;
 841                                 goto next;
 842                         }
 843                         switch(num) {
 844                         case 2:
 845                         case 3:
 846                         case 4:
 847                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 848                                 break;
 849                         default:
 850                                 return -EINVAL;
 851                         }
 852                 next:
 853                         vers += len + 1;
 854                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 855                 /* If all get turned off, turn them back on, as
 856                  * having no versions is BAD
 857                  */
 858                 nfsd_reset_versions();
 859         }
 860
 861         /* Now write current state into reply buffer */
 862         len = 0;
 863         sep = "";
 864         remaining = SIMPLE_TRANSACTION_LIMIT;
 865         for (num=2 ; num <= 4 ; num++)
 866                 if (nfsd_vers(num, NFSD_AVAIL)) {
 867                         len = snprintf(buf, remaining, "%s%c%d", sep,
 868                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 869                                        num);
 870                         sep = " ";
 871
 872                         if (len > remaining)
 873                                 break;
 874                         remaining -= len;
 875                         buf += len;
 876                         tlen += len;
 877                 }
 878         if (nfsd_vers(4, NFSD_AVAIL))
 879                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 880                      minor++) {
 881                         len = snprintf(buf, remaining, " %c4.%u",
 882                                         (nfsd_vers(4, NFSD_TEST) &&
 883                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 884                                                 '+' : '-',
 885                                         minor);
 886
 887                         if (len > remaining)
 888                                 break;
 889                         remaining -= len;
 890                         buf += len;
 891                         tlen += len;
 892                 }
 893
 894         len = snprintf(buf, remaining, "\n");
 895         if (len > remaining)
 896                 return -EINVAL;
 897         return tlen + len;
 898 }
 899
 900 /**
 901  * write_versions - Set or report the available NFS protocol versions
 902  *
 903  * Input:
 904  *                      buf:            ignored
 905  *                      size:           zero
 906  * Output:
 907  *      On success:     passed-in buffer filled with '\n'-terminated C
 908  *                      string containing positive or negative integer
 909  *                      values representing the current status of each
 910  *                      protocol version;
 911  *                      return code is the size in bytes of the string
 912  *      On error:       return code is zero or a negative errno value
 913  *
 914  * OR
 915  *
 916  * Input:
 917  *                      buf:            C string containing whitespace-
 918  *                                      separated positive or negative
 919  *                                      integer values representing NFS
 920  *                                      protocol versions to enable ("+n")
 921  *                                      or disable ("-n")
 922  *                      size:           non-zero length of C string in @buf
 923  * Output:
 924  *      On success:     status of zero or more protocol versions has
 925  *                      been updated; passed-in buffer filled with
 926  *                      '\n'-terminated C string containing positive
 927  *                      or negative integer values representing the
 928  *                      current status of each protocol version;
 929  *                      return code is the size in bytes of the string
 930  *      On error:       return code is zero or a negative errno value
 931  */
 932 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 933 {
 934         ssize_t rv;
 935
 936         mutex_lock(&nfsd_mutex);
 937         rv = __write_versions(file, buf, size);
 938         mutex_unlock(&nfsd_mutex);
 939         return rv;
 940 }
 941
 942 /*
 943  * Zero-length write.  Return a list of NFSD's current listener
 944  * transports.
 945  */
 946 static ssize_t __write_ports_names(char *buf)
 947 {
 948         if (nfsd_serv == NULL)
 949                 return 0;
 950         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 951 }
 952
 953 /*
 954  * A single 'fd' number was written, in which case it must be for
 955  * a socket of a supported family/protocol, and we use it as an
 956  * nfsd listener.
 957  */
 958 static ssize_t __write_ports_addfd(char *buf)
 959 {
 960         char *mesg = buf;
 961         int fd, err;
 962
 963         err = get_int(&mesg, &fd);
 964         if (err != 0 || fd < 0)
 965                 return -EINVAL;
 966
 967         err = nfsd_create_serv();
 968         if (err != 0)
 969                 return err;
 970
 971         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 972         if (err < 0) {
 973                 svc_destroy(nfsd_serv);
 974                 return err;
 975         }
 976
 977         /* Decrease the count, but don't shut down the service */
 978         nfsd_serv->sv_nrthreads--;
 979         return err;
 980 }
 981
 982 /*
 983  * A '-' followed by the 'name' of a socket means we close the socket.
 984  */
 985 static ssize_t __write_ports_delfd(char *buf)
 986 {
 987         char *toclose;
 988         int len = 0;
 989
 990         toclose = kstrdup(buf + 1, GFP_KERNEL);
 991         if (toclose == NULL)
 992                 return -ENOMEM;
 993
 994         if (nfsd_serv != NULL)
 995                 len = svc_sock_names(nfsd_serv, buf,
 996                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 997         kfree(toclose);
 998         return len;
 999 }
1000
1001 /*
1002  * A transport listener is added by writing it's transport name and
1003  * a port number.
1004  */
1005 static ssize_t __write_ports_addxprt(char *buf)
1006 {
1007         char transport[16];
1008         struct svc_xprt *xprt;
1009         int port, err;
1010
1011         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1012                 return -EINVAL;
1013
1014         if (port < 1 || port > USHRT_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, &init_net,
1022                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1023         if (err < 0)
1024                 goto out_err;
1025
1026         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1027                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1028         if (err < 0 && err != -EAFNOSUPPORT)
1029                 goto out_close;
1030
1031         /* Decrease the count, but don't shut down the service */
1032         nfsd_serv->sv_nrthreads--;
1033         return 0;
1034 out_close:
1035         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1036         if (xprt != NULL) {
1037                 svc_close_xprt(xprt);
1038                 svc_xprt_put(xprt);
1039         }
1040 out_err:
1041         svc_destroy(nfsd_serv);
1042         return err;
1043 }
1044
1045 /*
1046  * A transport listener is removed by writing a "-", it's transport
1047  * name, and it's port number.
1048  */
1049 static ssize_t __write_ports_delxprt(char *buf)
1050 {
1051         struct svc_xprt *xprt;
1052         char transport[16];
1053         int port;
1054
1055         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1056                 return -EINVAL;
1057
1058         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1059                 return -EINVAL;
1060
1061         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1062         if (xprt == NULL)
1063                 return -ENOTCONN;
1064
1065         svc_close_xprt(xprt);
1066         svc_xprt_put(xprt);
1067         return 0;
1068 }
1069
1070 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1071 {
1072         if (size == 0)
1073                 return __write_ports_names(buf);
1074
1075         if (isdigit(buf[0]))
1076                 return __write_ports_addfd(buf);
1077
1078         if (buf[0] == '-' && isdigit(buf[1]))
1079                 return __write_ports_delfd(buf);
1080
1081         if (isalpha(buf[0]))
1082                 return __write_ports_addxprt(buf);
1083
1084         if (buf[0] == '-' && isalpha(buf[1]))
1085                 return __write_ports_delxprt(buf);
1086
1087         return -EINVAL;
1088 }
1089
1090 /**
1091  * write_ports - Pass a socket file descriptor or transport name to listen on
1092  *
1093  * Input:
1094  *                      buf:            ignored
1095  *                      size:           zero
1096  * Output:
1097  *      On success:     passed-in buffer filled with a '\n'-terminated C
1098  *                      string containing a whitespace-separated list of
1099  *                      named NFSD listeners;
1100  *                      return code is the size in bytes of the string
1101  *      On error:       return code is zero or a negative errno value
1102  *
1103  * OR
1104  *
1105  * Input:
1106  *                      buf:            C string containing an unsigned
1107  *                                      integer value representing a bound
1108  *                                      but unconnected socket that is to be
1109  *                                      used as an NFSD listener; listen(3)
1110  *                                      must be called for a SOCK_STREAM
1111  *                                      socket, otherwise it is ignored
1112  *                      size:           non-zero length of C string in @buf
1113  * Output:
1114  *      On success:     NFS service is started;
1115  *                      passed-in buffer filled with a '\n'-terminated C
1116  *                      string containing a unique alphanumeric name of
1117  *                      the listener;
1118  *                      return code is the size in bytes of the string
1119  *      On error:       return code is a negative errno value
1120  *
1121  * OR
1122  *
1123  * Input:
1124  *                      buf:            C string containing a "-" followed
1125  *                                      by an integer value representing a
1126  *                                      previously passed in socket file
1127  *                                      descriptor
1128  *                      size:           non-zero length of C string in @buf
1129  * Output:
1130  *      On success:     NFS service no longer listens on that socket;
1131  *                      passed-in buffer filled with a '\n'-terminated C
1132  *                      string containing a unique name of the listener;
1133  *                      return code is the size in bytes of the string
1134  *      On error:       return code is a negative errno value
1135  *
1136  * OR
1137  *
1138  * Input:
1139  *                      buf:            C string containing a transport
1140  *                                      name and an unsigned integer value
1141  *                                      representing the port to listen on,
1142  *                                      separated by whitespace
1143  *                      size:           non-zero length of C string in @buf
1144  * Output:
1145  *      On success:     returns zero; NFS service is started
1146  *      On error:       return code is a negative errno value
1147  *
1148  * OR
1149  *
1150  * Input:
1151  *                      buf:            C string containing a "-" followed
1152  *                                      by a transport name and an unsigned
1153  *                                      integer value representing the port
1154  *                                      to listen on, separated by whitespace
1155  *                      size:           non-zero length of C string in @buf
1156  * Output:
1157  *      On success:     returns zero; NFS service no longer listens
1158  *                      on that transport
1159  *      On error:       return code is a negative errno value
1160  */
1161 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1162 {
1163         ssize_t rv;
1164
1165         mutex_lock(&nfsd_mutex);
1166         rv = __write_ports(file, buf, size);
1167         mutex_unlock(&nfsd_mutex);
1168         return rv;
1169 }
1170
1171
1172 int nfsd_max_blksize;
1173
1174 /**
1175  * write_maxblksize - Set or report the current NFS blksize
1176  *
1177  * Input:
1178  *                      buf:            ignored
1179  *                      size:           zero
1180  *
1181  * OR
1182  *
1183  * Input:
1184  *                      buf:            C string containing an unsigned
1185  *                                      integer value representing the new
1186  *                                      NFS blksize
1187  *                      size:           non-zero length of C string in @buf
1188  * Output:
1189  *      On success:     passed-in buffer filled with '\n'-terminated C string
1190  *                      containing numeric value of the current NFS blksize
1191  *                      setting;
1192  *                      return code is the size in bytes of the string
1193  *      On error:       return code is zero or a negative errno value
1194  */
1195 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1196 {
1197         char *mesg = buf;
1198         if (size > 0) {
1199                 int bsize;
1200                 int rv = get_int(&mesg, &bsize);
1201                 if (rv)
1202                         return rv;
1203                 /* force bsize into allowed range and
1204                  * required alignment.
1205                  */
1206                 if (bsize < 1024)
1207                         bsize = 1024;
1208                 if (bsize > NFSSVC_MAXBLKSIZE)
1209                         bsize = NFSSVC_MAXBLKSIZE;
1210                 bsize &= ~(1024-1);
1211                 mutex_lock(&nfsd_mutex);
1212                 if (nfsd_serv) {
1213                         mutex_unlock(&nfsd_mutex);
1214                         return -EBUSY;
1215                 }
1216                 nfsd_max_blksize = bsize;
1217                 mutex_unlock(&nfsd_mutex);
1218         }
1219
1220         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1221                                                         nfsd_max_blksize);
1222 }
1223
1224 #ifdef CONFIG_NFSD_V4
1225 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1226 {
1227         char *mesg = buf;
1228         int rv, i;
1229
1230         if (size > 0) {
1231                 if (nfsd_serv)
1232                         return -EBUSY;
1233                 rv = get_int(&mesg, &i);
1234                 if (rv)
1235                         return rv;
1236                 /*
1237                  * Some sanity checking.  We don't have a reason for
1238                  * these particular numbers, but problems with the
1239                  * extremes are:
1240                  *      - Too short: the briefest network outage may
1241                  *        cause clients to lose all their locks.  Also,
1242                  *        the frequent polling may be wasteful.
1243                  *      - Too long: do you really want reboot recovery
1244                  *        to take more than an hour?  Or to make other
1245                  *        clients wait an hour before being able to
1246                  *        revoke a dead client's locks?
1247                  */
1248                 if (i < 10 || i > 3600)
1249                         return -EINVAL;
1250                 *time = i;
1251         }
1252
1253         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1254 }
1255
1256 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1257 {
1258         ssize_t rv;
1259
1260         mutex_lock(&nfsd_mutex);
1261         rv = __nfsd4_write_time(file, buf, size, time);
1262         mutex_unlock(&nfsd_mutex);
1263         return rv;
1264 }
1265
1266 /**
1267  * write_leasetime - Set or report the current NFSv4 lease time
1268  *
1269  * Input:
1270  *                      buf:            ignored
1271  *                      size:           zero
1272  *
1273  * OR
1274  *
1275  * Input:
1276  *                      buf:            C string containing an unsigned
1277  *                                      integer value representing the new
1278  *                                      NFSv4 lease expiry time
1279  *                      size:           non-zero length of C string in @buf
1280  * Output:
1281  *      On success:     passed-in buffer filled with '\n'-terminated C
1282  *                      string containing unsigned integer value of the
1283  *                      current lease expiry time;
1284  *                      return code is the size in bytes of the string
1285  *      On error:       return code is zero or a negative errno value
1286  */
1287 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1288 {
1289         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1290 }
1291
1292 /**
1293  * write_gracetime - Set or report current NFSv4 grace period time
1294  *
1295  * As above, but sets the time of the NFSv4 grace period.
1296  *
1297  * Note this should never be set to less than the *previous*
1298  * lease-period time, but we don't try to enforce this.  (In the common
1299  * case (a new boot), we don't know what the previous lease time was
1300  * anyway.)
1301  */
1302 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1303 {
1304         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1305 }
1306
1307 extern char *nfs4_recoverydir(void);
1308
1309 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1310 {
1311         char *mesg = buf;
1312         char *recdir;
1313         int len, status;
1314
1315         if (size > 0) {
1316                 if (nfsd_serv)
1317                         return -EBUSY;
1318                 if (size > PATH_MAX || buf[size-1] != '\n')
1319                         return -EINVAL;
1320                 buf[size-1] = 0;
1321
1322                 recdir = mesg;
1323                 len = qword_get(&mesg, recdir, size);
1324                 if (len <= 0)
1325                         return -EINVAL;
1326
1327                 status = nfs4_reset_recoverydir(recdir);
1328                 if (status)
1329                         return status;
1330         }
1331
1332         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1333                                                         nfs4_recoverydir());
1334 }
1335
1336 /**
1337  * write_recoverydir - Set or report the pathname of the recovery directory
1338  *
1339  * Input:
1340  *                      buf:            ignored
1341  *                      size:           zero
1342  *
1343  * OR
1344  *
1345  * Input:
1346  *                      buf:            C string containing the pathname
1347  *                                      of the directory on a local file
1348  *                                      system containing permanent NFSv4
1349  *                                      recovery data
1350  *                      size:           non-zero length of C string in @buf
1351  * Output:
1352  *      On success:     passed-in buffer filled with '\n'-terminated C string
1353  *                      containing the current recovery pathname setting;
1354  *                      return code is the size in bytes of the string
1355  *      On error:       return code is zero or a negative errno value
1356  */
1357 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1358 {
1359         ssize_t rv;
1360
1361         mutex_lock(&nfsd_mutex);
1362         rv = __write_recoverydir(file, buf, size);
1363         mutex_unlock(&nfsd_mutex);
1364         return rv;
1365 }
1366
1367 #endif
1368
1369 /*----------------------------------------------------------------------------*/
1370 /*
1371  *      populating the filesystem.
1372  */
1373
1374 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1375 {
1376         static struct tree_descr nfsd_files[] = {
1377 #ifdef CONFIG_NFSD_DEPRECATED
1378                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1379                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1380                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1381                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1382                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1383                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1384                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1385 #endif
1386                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1387                 [NFSD_Export_features] = {"export_features",
1388                                         &export_features_operations, S_IRUGO},
1389                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1390                                         &transaction_ops, S_IWUSR|S_IRUSR},
1391                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1392                                         &transaction_ops, S_IWUSR|S_IRUSR},
1393                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1394                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1395                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1396                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1397                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1398                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1399                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1400 #ifdef CONFIG_NFSD_V4
1401                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1402                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1403                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1404 #endif
1405                 /* last one */ {""}
1406         };
1407         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1408 }
1409
1410 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1411         int flags, const char *dev_name, void *data)
1412 {
1413         return mount_single(fs_type, flags, data, nfsd_fill_super);
1414 }
1415
1416 static struct file_system_type nfsd_fs_type = {
1417         .owner          = THIS_MODULE,
1418         .name           = "nfsd",
1419         .mount          = nfsd_mount,
1420         .kill_sb        = kill_litter_super,
1421 };
1422
1423 #ifdef CONFIG_PROC_FS
1424 static int create_proc_exports_entry(void)
1425 {
1426         struct proc_dir_entry *entry;
1427
1428         entry = proc_mkdir("fs/nfs", NULL);
1429         if (!entry)
1430                 return -ENOMEM;
1431         entry = proc_create("exports", 0, entry, &exports_operations);
1432         if (!entry)
1433                 return -ENOMEM;
1434         return 0;
1435 }
1436 #else /* CONFIG_PROC_FS */
1437 static int create_proc_exports_entry(void)
1438 {
1439         return 0;
1440 }
1441 #endif
1442
1443 static int __init init_nfsd(void)
1444 {
1445         int retval;
1446         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1447
1448         retval = nfs4_state_init(); /* nfs4 locking state */
1449         if (retval)
1450                 return retval;
1451         nfsd_stat_init();       /* Statistics */
1452         retval = nfsd_reply_cache_init();
1453         if (retval)
1454                 goto out_free_stat;
1455         retval = nfsd_export_init();
1456         if (retval)
1457                 goto out_free_cache;
1458         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1459         retval = nfsd_idmap_init();
1460         if (retval)
1461                 goto out_free_lockd;
1462         retval = create_proc_exports_entry();
1463         if (retval)
1464                 goto out_free_idmap;
1465         retval = register_filesystem(&nfsd_fs_type);
1466         if (retval)
1467                 goto out_free_all;
1468         return 0;
1469 out_free_all:
1470         remove_proc_entry("fs/nfs/exports", NULL);
1471         remove_proc_entry("fs/nfs", NULL);
1472 out_free_idmap:
1473         nfsd_idmap_shutdown();
1474 out_free_lockd:
1475         nfsd_lockd_shutdown();
1476         nfsd_export_shutdown();
1477 out_free_cache:
1478         nfsd_reply_cache_shutdown();
1479 out_free_stat:
1480         nfsd_stat_shutdown();
1481         nfsd4_free_slabs();
1482         return retval;
1483 }
1484
1485 static void __exit exit_nfsd(void)
1486 {
1487         nfsd_export_shutdown();
1488         nfsd_reply_cache_shutdown();
1489         remove_proc_entry("fs/nfs/exports", NULL);
1490         remove_proc_entry("fs/nfs", NULL);
1491         nfsd_stat_shutdown();
1492         nfsd_lockd_shutdown();
1493         nfsd_idmap_shutdown();
1494         nfsd4_free_slabs();
1495         unregister_filesystem(&nfsd_fs_type);
1496 }
1497
1498 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1499 MODULE_LICENSE("GPL");
1500 module_init(init_nfsd)
1501 module_exit(exit_nfsd)