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                 printk(KERN_INFO
 133                        "Warning: \"%s\" uses deprecated NFSD interface: %s."
 134                        "  This will be removed in 2.6.40\n",
 135                        current->comm, file->f_dentry->d_name.name);
 136                 warned = 1;
 137         }
 138         if (! file->private_data) {
 139                 /* An attempt to read a transaction file without writing
 140                  * causes a 0-byte write so that the file can return
 141                  * state information
 142                  */
 143                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 144                 if (rv < 0)
 145                         return rv;
 146         }
 147         return simple_transaction_read(file, buf, size, pos);
 148 }
 149
 150 static const struct file_operations transaction_ops = {
 151         .write          = nfsctl_transaction_write,
 152         .read           = nfsctl_transaction_read,
 153         .release        = simple_transaction_release,
 154 };
 155
 156 static int exports_open(struct inode *inode, struct file *file)
 157 {
 158         return seq_open(file, &nfs_exports_op);
 159 }
 160
 161 static const struct file_operations exports_operations = {
 162         .open           = exports_open,
 163         .read           = seq_read,
 164         .llseek         = seq_lseek,
 165         .release        = seq_release,
 166         .owner          = THIS_MODULE,
 167 };
 168
 169 static int export_features_show(struct seq_file *m, void *v)
 170 {
 171         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 172         return 0;
 173 }
 174
 175 static int export_features_open(struct inode *inode, struct file *file)
 176 {
 177         return single_open(file, export_features_show, NULL);
 178 }
 179
 180 static struct file_operations export_features_operations = {
 181         .open           = export_features_open,
 182         .read           = seq_read,
 183         .llseek         = seq_lseek,
 184         .release        = single_release,
 185 };
 186
 187 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 188 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 189
 190 static const struct file_operations pool_stats_operations = {
 191         .open           = nfsd_pool_stats_open,
 192         .read           = seq_read,
 193         .llseek         = seq_lseek,
 194         .release        = nfsd_pool_stats_release,
 195         .owner          = THIS_MODULE,
 196 };
 197
 198 /*----------------------------------------------------------------------------*/
 199 /*
 200  * payload - write methods
 201  */
 202
 203 #ifdef CONFIG_NFSD_DEPRECATED
 204 /**
 205  * write_svc - Start kernel's NFSD server
 206  *
 207  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 208  * Function remains to support old versions of nfs-utils.
 209  *
 210  * Input:
 211  *                      buf:    struct nfsctl_svc
 212  *                              svc_port:       port number of this
 213  *                                              server's listener
 214  *                              svc_nthreads:   number of threads to start
 215  *                      size:   size in bytes of passed in nfsctl_svc
 216  * Output:
 217  *      On success:     returns zero
 218  *      On error:       return code is negative errno value
 219  */
 220 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 221 {
 222         struct nfsctl_svc *data;
 223         int err;
 224         if (size < sizeof(*data))
 225                 return -EINVAL;
 226         data = (struct nfsctl_svc*) buf;
 227         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 228         if (err < 0)
 229                 return err;
 230         return 0;
 231 }
 232
 233 /**
 234  * write_add - Add or modify client entry in auth unix cache
 235  *
 236  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 237  * Function remains to support old versions of nfs-utils.
 238  *
 239  * Input:
 240  *                      buf:    struct nfsctl_client
 241  *                              cl_ident:       '\0'-terminated C string
 242  *                                              containing domain name
 243  *                                              of client
 244  *                              cl_naddr:       no. of items in cl_addrlist
 245  *                              cl_addrlist:    array of client addresses
 246  *                              cl_fhkeytype:   ignored
 247  *                              cl_fhkeylen:    ignored
 248  *                              cl_fhkey:       ignored
 249  *                      size:   size in bytes of passed in nfsctl_client
 250  * Output:
 251  *      On success:     returns zero
 252  *      On error:       return code is negative errno value
 253  *
 254  * Note: Only AF_INET client addresses are passed in, since
 255  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 256  */
 257 static ssize_t write_add(struct file *file, char *buf, size_t size)
 258 {
 259         struct nfsctl_client *data;
 260         if (size < sizeof(*data))
 261                 return -EINVAL;
 262         data = (struct nfsctl_client *)buf;
 263         return exp_addclient(data);
 264 }
 265
 266 /**
 267  * write_del - Remove client from auth unix cache
 268  *
 269  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 270  * Function remains to support old versions of nfs-utils.
 271  *
 272  * Input:
 273  *                      buf:    struct nfsctl_client
 274  *                              cl_ident:       '\0'-terminated C string
 275  *                                              containing domain name
 276  *                                              of client
 277  *                              cl_naddr:       ignored
 278  *                              cl_addrlist:    ignored
 279  *                              cl_fhkeytype:   ignored
 280  *                              cl_fhkeylen:    ignored
 281  *                              cl_fhkey:       ignored
 282  *                      size:   size in bytes of passed in nfsctl_client
 283  * Output:
 284  *      On success:     returns zero
 285  *      On error:       return code is negative errno value
 286  *
 287  * Note: Only AF_INET client addresses are passed in, since
 288  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 289  */
 290 static ssize_t write_del(struct file *file, char *buf, size_t size)
 291 {
 292         struct nfsctl_client *data;
 293         if (size < sizeof(*data))
 294                 return -EINVAL;
 295         data = (struct nfsctl_client *)buf;
 296         return exp_delclient(data);
 297 }
 298
 299 /**
 300  * write_export - Export part or all of a local file system
 301  *
 302  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 303  * Function remains to support old versions of nfs-utils.
 304  *
 305  * Input:
 306  *                      buf:    struct nfsctl_export
 307  *                              ex_client:      '\0'-terminated C string
 308  *                                              containing domain name
 309  *                                              of client allowed to access
 310  *                                              this export
 311  *                              ex_path:        '\0'-terminated C string
 312  *                                              containing pathname of
 313  *                                              directory in local file system
 314  *                              ex_dev:         fsid to use for this export
 315  *                              ex_ino:         ignored
 316  *                              ex_flags:       export flags for this export
 317  *                              ex_anon_uid:    UID to use for anonymous
 318  *                                              requests
 319  *                              ex_anon_gid:    GID to use for anonymous
 320  *                                              requests
 321  *                      size:   size in bytes of passed in nfsctl_export
 322  * Output:
 323  *      On success:     returns zero
 324  *      On error:       return code is negative errno value
 325  */
 326 static ssize_t write_export(struct file *file, char *buf, size_t size)
 327 {
 328         struct nfsctl_export *data;
 329         if (size < sizeof(*data))
 330                 return -EINVAL;
 331         data = (struct nfsctl_export*)buf;
 332         return exp_export(data);
 333 }
 334
 335 /**
 336  * write_unexport - Unexport a previously exported file system
 337  *
 338  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 339  * Function remains to support old versions of nfs-utils.
 340  *
 341  * Input:
 342  *                      buf:    struct nfsctl_export
 343  *                              ex_client:      '\0'-terminated C string
 344  *                                              containing domain name
 345  *                                              of client no longer allowed
 346  *                                              to access this export
 347  *                              ex_path:        '\0'-terminated C string
 348  *                                              containing pathname of
 349  *                                              directory in local file system
 350  *                              ex_dev:         ignored
 351  *                              ex_ino:         ignored
 352  *                              ex_flags:       ignored
 353  *                              ex_anon_uid:    ignored
 354  *                              ex_anon_gid:    ignored
 355  *                      size:   size in bytes of passed in nfsctl_export
 356  * Output:
 357  *      On success:     returns zero
 358  *      On error:       return code is negative errno value
 359  */
 360 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 361 {
 362         struct nfsctl_export *data;
 363
 364         if (size < sizeof(*data))
 365                 return -EINVAL;
 366         data = (struct nfsctl_export*)buf;
 367         return exp_unexport(data);
 368 }
 369
 370 /**
 371  * write_getfs - Get a variable-length NFS file handle by path
 372  *
 373  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 374  * Function remains to support old versions of nfs-utils.
 375  *
 376  * Input:
 377  *                      buf:    struct nfsctl_fsparm
 378  *                              gd_addr:        socket address of client
 379  *                              gd_path:        '\0'-terminated C string
 380  *                                              containing pathname of
 381  *                                              directory in local file system
 382  *                              gd_maxlen:      maximum size of returned file
 383  *                                              handle
 384  *                      size:   size in bytes of passed in nfsctl_fsparm
 385  * Output:
 386  *      On success:     passed-in buffer filled with a knfsd_fh structure
 387  *                      (a variable-length raw NFS file handle);
 388  *                      return code is the size in bytes of the file handle
 389  *      On error:       return code is negative errno value
 390  *
 391  * Note: Only AF_INET client addresses are passed in, since gd_addr
 392  * is the same size as a struct sockaddr_in.
 393  */
 394 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 395 {
 396         struct nfsctl_fsparm *data;
 397         struct sockaddr_in *sin;
 398         struct auth_domain *clp;
 399         int err = 0;
 400         struct knfsd_fh *res;
 401         struct in6_addr in6;
 402
 403         if (size < sizeof(*data))
 404                 return -EINVAL;
 405         data = (struct nfsctl_fsparm*)buf;
 406         err = -EPROTONOSUPPORT;
 407         if (data->gd_addr.sa_family != AF_INET)
 408                 goto out;
 409         sin = (struct sockaddr_in *)&data->gd_addr;
 410         if (data->gd_maxlen > NFS3_FHSIZE)
 411                 data->gd_maxlen = NFS3_FHSIZE;
 412
 413         res = (struct knfsd_fh*)buf;
 414
 415         exp_readlock();
 416
 417         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 418
 419         clp = auth_unix_lookup(&init_net, &in6);
 420         if (!clp)
 421                 err = -EPERM;
 422         else {
 423                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 424                 auth_domain_put(clp);
 425         }
 426         exp_readunlock();
 427         if (err == 0)
 428                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 429  out:
 430         return err;
 431 }
 432
 433 /**
 434  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 435  *
 436  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 437  * Function remains to support old versions of nfs-utils.
 438  *
 439  * Input:
 440  *                      buf:    struct nfsctl_fdparm
 441  *                              gd_addr:        socket address of client
 442  *                              gd_path:        '\0'-terminated C string
 443  *                                              containing pathname of
 444  *                                              directory in local file system
 445  *                              gd_version:     fdparm structure version
 446  *                      size:   size in bytes of passed in nfsctl_fdparm
 447  * Output:
 448  *      On success:     passed-in buffer filled with nfsctl_res
 449  *                      (a fixed-length raw NFS file handle);
 450  *                      return code is the size in bytes of the file handle
 451  *      On error:       return code is negative errno value
 452  *
 453  * Note: Only AF_INET client addresses are passed in, since gd_addr
 454  * is the same size as a struct sockaddr_in.
 455  */
 456 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 457 {
 458         struct nfsctl_fdparm *data;
 459         struct sockaddr_in *sin;
 460         struct auth_domain *clp;
 461         int err = 0;
 462         struct knfsd_fh fh;
 463         char *res;
 464         struct in6_addr in6;
 465
 466         if (size < sizeof(*data))
 467                 return -EINVAL;
 468         data = (struct nfsctl_fdparm*)buf;
 469         err = -EPROTONOSUPPORT;
 470         if (data->gd_addr.sa_family != AF_INET)
 471                 goto out;
 472         err = -EINVAL;
 473         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 474                 goto out;
 475
 476         res = buf;
 477         sin = (struct sockaddr_in *)&data->gd_addr;
 478         exp_readlock();
 479
 480         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 481
 482         clp = auth_unix_lookup(&init_net, &in6);
 483         if (!clp)
 484                 err = -EPERM;
 485         else {
 486                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 487                 auth_domain_put(clp);
 488         }
 489         exp_readunlock();
 490
 491         if (err == 0) {
 492                 memset(res,0, NFS_FHSIZE);
 493                 memcpy(res, &fh.fh_base, fh.fh_size);
 494                 err = NFS_FHSIZE;
 495         }
 496  out:
 497         return err;
 498 }
 499 #endif /* CONFIG_NFSD_DEPRECATED */
 500
 501 /**
 502  * write_unlock_ip - Release all locks used by a client
 503  *
 504  * Experimental.
 505  *
 506  * Input:
 507  *                      buf:    '\n'-terminated C string containing a
 508  *                              presentation format IP address
 509  *                      size:   length of C string in @buf
 510  * Output:
 511  *      On success:     returns zero if all specified locks were released;
 512  *                      returns one if one or more locks were not released
 513  *      On error:       return code is negative errno value
 514  */
 515 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 516 {
 517         struct sockaddr_storage address;
 518         struct sockaddr *sap = (struct sockaddr *)&address;
 519         size_t salen = sizeof(address);
 520         char *fo_path;
 521
 522         /* sanity check */
 523         if (size == 0)
 524                 return -EINVAL;
 525
 526         if (buf[size-1] != '\n')
 527                 return -EINVAL;
 528
 529         fo_path = buf;
 530         if (qword_get(&buf, fo_path, size) < 0)
 531                 return -EINVAL;
 532
 533         if (rpc_pton(fo_path, size, sap, salen) == 0)
 534                 return -EINVAL;
 535
 536         return nlmsvc_unlock_all_by_ip(sap);
 537 }
 538
 539 /**
 540  * write_unlock_fs - Release all locks on a local file system
 541  *
 542  * Experimental.
 543  *
 544  * Input:
 545  *                      buf:    '\n'-terminated C string containing the
 546  *                              absolute pathname of a local file system
 547  *                      size:   length of C string in @buf
 548  * Output:
 549  *      On success:     returns zero if all specified locks were released;
 550  *                      returns one if one or more locks were not released
 551  *      On error:       return code is negative errno value
 552  */
 553 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 554 {
 555         struct path path;
 556         char *fo_path;
 557         int error;
 558
 559         /* sanity check */
 560         if (size == 0)
 561                 return -EINVAL;
 562
 563         if (buf[size-1] != '\n')
 564                 return -EINVAL;
 565
 566         fo_path = buf;
 567         if (qword_get(&buf, fo_path, size) < 0)
 568                 return -EINVAL;
 569
 570         error = kern_path(fo_path, 0, &path);
 571         if (error)
 572                 return error;
 573
 574         /*
 575          * XXX: Needs better sanity checking.  Otherwise we could end up
 576          * releasing locks on the wrong file system.
 577          *
 578          * For example:
 579          * 1.  Does the path refer to a directory?
 580          * 2.  Is that directory a mount point, or
 581          * 3.  Is that directory the root of an exported file system?
 582          */
 583         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 584
 585         path_put(&path);
 586         return error;
 587 }
 588
 589 /**
 590  * write_filehandle - Get a variable-length NFS file handle by path
 591  *
 592  * On input, the buffer contains a '\n'-terminated C string comprised of
 593  * three alphanumeric words separated by whitespace.  The string may
 594  * contain escape sequences.
 595  *
 596  * Input:
 597  *                      buf:
 598  *                              domain:         client domain name
 599  *                              path:           export pathname
 600  *                              maxsize:        numeric maximum size of
 601  *                                              @buf
 602  *                      size:   length of C string in @buf
 603  * Output:
 604  *      On success:     passed-in buffer filled with '\n'-terminated C
 605  *                      string containing a ASCII hex text version
 606  *                      of the NFS file handle;
 607  *                      return code is the size in bytes of the string
 608  *      On error:       return code is negative errno value
 609  */
 610 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 611 {
 612         char *dname, *path;
 613         int uninitialized_var(maxsize);
 614         char *mesg = buf;
 615         int len;
 616         struct auth_domain *dom;
 617         struct knfsd_fh fh;
 618
 619         if (size == 0)
 620                 return -EINVAL;
 621
 622         if (buf[size-1] != '\n')
 623                 return -EINVAL;
 624         buf[size-1] = 0;
 625
 626         dname = mesg;
 627         len = qword_get(&mesg, dname, size);
 628         if (len <= 0)
 629                 return -EINVAL;
 630
 631         path = dname+len+1;
 632         len = qword_get(&mesg, path, size);
 633         if (len <= 0)
 634                 return -EINVAL;
 635
 636         len = get_int(&mesg, &maxsize);
 637         if (len)
 638                 return len;
 639
 640         if (maxsize < NFS_FHSIZE)
 641                 return -EINVAL;
 642         if (maxsize > NFS3_FHSIZE)
 643                 maxsize = NFS3_FHSIZE;
 644
 645         if (qword_get(&mesg, mesg, size)>0)
 646                 return -EINVAL;
 647
 648         /* we have all the words, they are in buf.. */
 649         dom = unix_domain_find(dname);
 650         if (!dom)
 651                 return -ENOMEM;
 652
 653         len = exp_rootfh(dom, path, &fh,  maxsize);
 654         auth_domain_put(dom);
 655         if (len)
 656                 return len;
 657
 658         mesg = buf;
 659         len = SIMPLE_TRANSACTION_LIMIT;
 660         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 661         mesg[-1] = '\n';
 662         return mesg - buf;
 663 }
 664
 665 /**
 666  * write_threads - Start NFSD, or report the current number of running threads
 667  *
 668  * Input:
 669  *                      buf:            ignored
 670  *                      size:           zero
 671  * Output:
 672  *      On success:     passed-in buffer filled with '\n'-terminated C
 673  *                      string numeric value representing the number of
 674  *                      running NFSD threads;
 675  *                      return code is the size in bytes of the string
 676  *      On error:       return code is zero
 677  *
 678  * OR
 679  *
 680  * Input:
 681  *                      buf:            C string containing an unsigned
 682  *                                      integer value representing the
 683  *                                      number of NFSD threads to start
 684  *                      size:           non-zero length of C string in @buf
 685  * Output:
 686  *      On success:     NFS service is started;
 687  *                      passed-in buffer filled with '\n'-terminated C
 688  *                      string numeric value representing the number of
 689  *                      running NFSD threads;
 690  *                      return code is the size in bytes of the string
 691  *      On error:       return code is zero or a negative errno value
 692  */
 693 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 694 {
 695         char *mesg = buf;
 696         int rv;
 697         if (size > 0) {
 698                 int newthreads;
 699                 rv = get_int(&mesg, &newthreads);
 700                 if (rv)
 701                         return rv;
 702                 if (newthreads < 0)
 703                         return -EINVAL;
 704                 rv = nfsd_svc(NFS_PORT, newthreads);
 705                 if (rv < 0)
 706                         return rv;
 707         } else
 708                 rv = nfsd_nrthreads();
 709
 710         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 711 }
 712
 713 /**
 714  * write_pool_threads - Set or report the current number of threads per pool
 715  *
 716  * Input:
 717  *                      buf:            ignored
 718  *                      size:           zero
 719  *
 720  * OR
 721  *
 722  * Input:
 723  *                      buf:            C string containing whitespace-
 724  *                                      separated unsigned integer values
 725  *                                      representing the number of NFSD
 726  *                                      threads to start in each pool
 727  *                      size:           non-zero length of C string in @buf
 728  * Output:
 729  *      On success:     passed-in buffer filled with '\n'-terminated C
 730  *                      string containing integer values representing the
 731  *                      number of NFSD threads in each pool;
 732  *                      return code is the size in bytes of the string
 733  *      On error:       return code is zero or a negative errno value
 734  */
 735 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 736 {
 737         /* if size > 0, look for an array of number of threads per node
 738          * and apply them  then write out number of threads per node as reply
 739          */
 740         char *mesg = buf;
 741         int i;
 742         int rv;
 743         int len;
 744         int npools;
 745         int *nthreads;
 746
 747         mutex_lock(&nfsd_mutex);
 748         npools = nfsd_nrpools();
 749         if (npools == 0) {
 750                 /*
 751                  * NFS is shut down.  The admin can start it by
 752                  * writing to the threads file but NOT the pool_threads
 753                  * file, sorry.  Report zero threads.
 754                  */
 755                 mutex_unlock(&nfsd_mutex);
 756                 strcpy(buf, "0\n");
 757                 return strlen(buf);
 758         }
 759
 760         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 761         rv = -ENOMEM;
 762         if (nthreads == NULL)
 763                 goto out_free;
 764
 765         if (size > 0) {
 766                 for (i = 0; i < npools; i++) {
 767                         rv = get_int(&mesg, &nthreads[i]);
 768                         if (rv == -ENOENT)
 769                                 break;          /* fewer numbers than pools */
 770                         if (rv)
 771                                 goto out_free;  /* syntax error */
 772                         rv = -EINVAL;
 773                         if (nthreads[i] < 0)
 774                                 goto out_free;
 775                 }
 776                 rv = nfsd_set_nrthreads(i, nthreads);
 777                 if (rv)
 778                         goto out_free;
 779         }
 780
 781         rv = nfsd_get_nrthreads(npools, nthreads);
 782         if (rv)
 783                 goto out_free;
 784
 785         mesg = buf;
 786         size = SIMPLE_TRANSACTION_LIMIT;
 787         for (i = 0; i < npools && size > 0; i++) {
 788                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 789                 len = strlen(mesg);
 790                 size -= len;
 791                 mesg += len;
 792         }
 793         rv = mesg - buf;
 794 out_free:
 795         kfree(nthreads);
 796         mutex_unlock(&nfsd_mutex);
 797         return rv;
 798 }
 799
 800 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 801 {
 802         char *mesg = buf;
 803         char *vers, *minorp, sign;
 804         int len, num, remaining;
 805         unsigned minor;
 806         ssize_t tlen = 0;
 807         char *sep;
 808
 809         if (size>0) {
 810                 if (nfsd_serv)
 811                         /* Cannot change versions without updating
 812                          * nfsd_serv->sv_xdrsize, and reallocing
 813                          * rq_argp and rq_resp
 814                          */
 815                         return -EBUSY;
 816                 if (buf[size-1] != '\n')
 817                         return -EINVAL;
 818                 buf[size-1] = 0;
 819
 820                 vers = mesg;
 821                 len = qword_get(&mesg, vers, size);
 822                 if (len <= 0) return -EINVAL;
 823                 do {
 824                         sign = *vers;
 825                         if (sign == '+' || sign == '-')
 826                                 num = simple_strtol((vers+1), &minorp, 0);
 827                         else
 828                                 num = simple_strtol(vers, &minorp, 0);
 829                         if (*minorp == '.') {
 830                                 if (num < 4)
 831                                         return -EINVAL;
 832                                 minor = simple_strtoul(minorp+1, NULL, 0);
 833                                 if (minor == 0)
 834                                         return -EINVAL;
 835                                 if (nfsd_minorversion(minor, sign == '-' ?
 836                                                      NFSD_CLEAR : NFSD_SET) < 0)
 837                                         return -EINVAL;
 838                                 goto next;
 839                         }
 840                         switch(num) {
 841                         case 2:
 842                         case 3:
 843                         case 4:
 844                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 845                                 break;
 846                         default:
 847                                 return -EINVAL;
 848                         }
 849                 next:
 850                         vers += len + 1;
 851                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 852                 /* If all get turned off, turn them back on, as
 853                  * having no versions is BAD
 854                  */
 855                 nfsd_reset_versions();
 856         }
 857
 858         /* Now write current state into reply buffer */
 859         len = 0;
 860         sep = "";
 861         remaining = SIMPLE_TRANSACTION_LIMIT;
 862         for (num=2 ; num <= 4 ; num++)
 863                 if (nfsd_vers(num, NFSD_AVAIL)) {
 864                         len = snprintf(buf, remaining, "%s%c%d", sep,
 865                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 866                                        num);
 867                         sep = " ";
 868
 869                         if (len > remaining)
 870                                 break;
 871                         remaining -= len;
 872                         buf += len;
 873                         tlen += len;
 874                 }
 875         if (nfsd_vers(4, NFSD_AVAIL))
 876                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 877                      minor++) {
 878                         len = snprintf(buf, remaining, " %c4.%u",
 879                                         (nfsd_vers(4, NFSD_TEST) &&
 880                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 881                                                 '+' : '-',
 882                                         minor);
 883
 884                         if (len > remaining)
 885                                 break;
 886                         remaining -= len;
 887                         buf += len;
 888                         tlen += len;
 889                 }
 890
 891         len = snprintf(buf, remaining, "\n");
 892         if (len > remaining)
 893                 return -EINVAL;
 894         return tlen + len;
 895 }
 896
 897 /**
 898  * write_versions - Set or report the available NFS protocol versions
 899  *
 900  * Input:
 901  *                      buf:            ignored
 902  *                      size:           zero
 903  * Output:
 904  *      On success:     passed-in buffer filled with '\n'-terminated C
 905  *                      string containing positive or negative integer
 906  *                      values representing the current status of each
 907  *                      protocol version;
 908  *                      return code is the size in bytes of the string
 909  *      On error:       return code is zero or a negative errno value
 910  *
 911  * OR
 912  *
 913  * Input:
 914  *                      buf:            C string containing whitespace-
 915  *                                      separated positive or negative
 916  *                                      integer values representing NFS
 917  *                                      protocol versions to enable ("+n")
 918  *                                      or disable ("-n")
 919  *                      size:           non-zero length of C string in @buf
 920  * Output:
 921  *      On success:     status of zero or more protocol versions has
 922  *                      been updated; passed-in buffer filled with
 923  *                      '\n'-terminated C string containing positive
 924  *                      or negative integer values representing the
 925  *                      current status of each protocol version;
 926  *                      return code is the size in bytes of the string
 927  *      On error:       return code is zero or a negative errno value
 928  */
 929 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 930 {
 931         ssize_t rv;
 932
 933         mutex_lock(&nfsd_mutex);
 934         rv = __write_versions(file, buf, size);
 935         mutex_unlock(&nfsd_mutex);
 936         return rv;
 937 }
 938
 939 /*
 940  * Zero-length write.  Return a list of NFSD's current listener
 941  * transports.
 942  */
 943 static ssize_t __write_ports_names(char *buf)
 944 {
 945         if (nfsd_serv == NULL)
 946                 return 0;
 947         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 948 }
 949
 950 /*
 951  * A single 'fd' number was written, in which case it must be for
 952  * a socket of a supported family/protocol, and we use it as an
 953  * nfsd listener.
 954  */
 955 static ssize_t __write_ports_addfd(char *buf)
 956 {
 957         char *mesg = buf;
 958         int fd, err;
 959
 960         err = get_int(&mesg, &fd);
 961         if (err != 0 || fd < 0)
 962                 return -EINVAL;
 963
 964         err = nfsd_create_serv();
 965         if (err != 0)
 966                 return err;
 967
 968         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 969         if (err < 0) {
 970                 svc_destroy(nfsd_serv);
 971                 return err;
 972         }
 973
 974         /* Decrease the count, but don't shut down the service */
 975         nfsd_serv->sv_nrthreads--;
 976         return err;
 977 }
 978
 979 /*
 980  * A '-' followed by the 'name' of a socket means we close the socket.
 981  */
 982 static ssize_t __write_ports_delfd(char *buf)
 983 {
 984         char *toclose;
 985         int len = 0;
 986
 987         toclose = kstrdup(buf + 1, GFP_KERNEL);
 988         if (toclose == NULL)
 989                 return -ENOMEM;
 990
 991         if (nfsd_serv != NULL)
 992                 len = svc_sock_names(nfsd_serv, buf,
 993                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 994         kfree(toclose);
 995         return len;
 996 }
 997
 998 /*
 999  * A transport listener is added by writing it's transport name and
1000  * a port number.
1001  */
1002 static ssize_t __write_ports_addxprt(char *buf)
1003 {
1004         char transport[16];
1005         struct svc_xprt *xprt;
1006         int port, err;
1007
1008         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1009                 return -EINVAL;
1010
1011         if (port < 1 || port > USHRT_MAX)
1012                 return -EINVAL;
1013
1014         err = nfsd_create_serv();
1015         if (err != 0)
1016                 return err;
1017
1018         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1019                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1020         if (err < 0)
1021                 goto out_err;
1022
1023         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1024                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1025         if (err < 0 && err != -EAFNOSUPPORT)
1026                 goto out_close;
1027
1028         /* Decrease the count, but don't shut down the service */
1029         nfsd_serv->sv_nrthreads--;
1030         return 0;
1031 out_close:
1032         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1033         if (xprt != NULL) {
1034                 svc_close_xprt(xprt);
1035                 svc_xprt_put(xprt);
1036         }
1037 out_err:
1038         svc_destroy(nfsd_serv);
1039         return err;
1040 }
1041
1042 /*
1043  * A transport listener is removed by writing a "-", it's transport
1044  * name, and it's port number.
1045  */
1046 static ssize_t __write_ports_delxprt(char *buf)
1047 {
1048         struct svc_xprt *xprt;
1049         char transport[16];
1050         int port;
1051
1052         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1053                 return -EINVAL;
1054
1055         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1056                 return -EINVAL;
1057
1058         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1059         if (xprt == NULL)
1060                 return -ENOTCONN;
1061
1062         svc_close_xprt(xprt);
1063         svc_xprt_put(xprt);
1064         return 0;
1065 }
1066
1067 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1068 {
1069         if (size == 0)
1070                 return __write_ports_names(buf);
1071
1072         if (isdigit(buf[0]))
1073                 return __write_ports_addfd(buf);
1074
1075         if (buf[0] == '-' && isdigit(buf[1]))
1076                 return __write_ports_delfd(buf);
1077
1078         if (isalpha(buf[0]))
1079                 return __write_ports_addxprt(buf);
1080
1081         if (buf[0] == '-' && isalpha(buf[1]))
1082                 return __write_ports_delxprt(buf);
1083
1084         return -EINVAL;
1085 }
1086
1087 /**
1088  * write_ports - Pass a socket file descriptor or transport name to listen on
1089  *
1090  * Input:
1091  *                      buf:            ignored
1092  *                      size:           zero
1093  * Output:
1094  *      On success:     passed-in buffer filled with a '\n'-terminated C
1095  *                      string containing a whitespace-separated list of
1096  *                      named NFSD listeners;
1097  *                      return code is the size in bytes of the string
1098  *      On error:       return code is zero or a negative errno value
1099  *
1100  * OR
1101  *
1102  * Input:
1103  *                      buf:            C string containing an unsigned
1104  *                                      integer value representing a bound
1105  *                                      but unconnected socket that is to be
1106  *                                      used as an NFSD listener; listen(3)
1107  *                                      must be called for a SOCK_STREAM
1108  *                                      socket, otherwise it is ignored
1109  *                      size:           non-zero length of C string in @buf
1110  * Output:
1111  *      On success:     NFS service is started;
1112  *                      passed-in buffer filled with a '\n'-terminated C
1113  *                      string containing a unique alphanumeric name of
1114  *                      the listener;
1115  *                      return code is the size in bytes of the string
1116  *      On error:       return code is a negative errno value
1117  *
1118  * OR
1119  *
1120  * Input:
1121  *                      buf:            C string containing a "-" followed
1122  *                                      by an integer value representing a
1123  *                                      previously passed in socket file
1124  *                                      descriptor
1125  *                      size:           non-zero length of C string in @buf
1126  * Output:
1127  *      On success:     NFS service no longer listens on that socket;
1128  *                      passed-in buffer filled with a '\n'-terminated C
1129  *                      string containing a unique name of the listener;
1130  *                      return code is the size in bytes of the string
1131  *      On error:       return code is a negative errno value
1132  *
1133  * OR
1134  *
1135  * Input:
1136  *                      buf:            C string containing a transport
1137  *                                      name and an unsigned integer value
1138  *                                      representing the port to listen on,
1139  *                                      separated by whitespace
1140  *                      size:           non-zero length of C string in @buf
1141  * Output:
1142  *      On success:     returns zero; NFS service is started
1143  *      On error:       return code is a negative errno value
1144  *
1145  * OR
1146  *
1147  * Input:
1148  *                      buf:            C string containing a "-" followed
1149  *                                      by a transport name and an unsigned
1150  *                                      integer value representing the port
1151  *                                      to listen on, separated by whitespace
1152  *                      size:           non-zero length of C string in @buf
1153  * Output:
1154  *      On success:     returns zero; NFS service no longer listens
1155  *                      on that transport
1156  *      On error:       return code is a negative errno value
1157  */
1158 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1159 {
1160         ssize_t rv;
1161
1162         mutex_lock(&nfsd_mutex);
1163         rv = __write_ports(file, buf, size);
1164         mutex_unlock(&nfsd_mutex);
1165         return rv;
1166 }
1167
1168
1169 int nfsd_max_blksize;
1170
1171 /**
1172  * write_maxblksize - Set or report the current NFS blksize
1173  *
1174  * Input:
1175  *                      buf:            ignored
1176  *                      size:           zero
1177  *
1178  * OR
1179  *
1180  * Input:
1181  *                      buf:            C string containing an unsigned
1182  *                                      integer value representing the new
1183  *                                      NFS blksize
1184  *                      size:           non-zero length of C string in @buf
1185  * Output:
1186  *      On success:     passed-in buffer filled with '\n'-terminated C string
1187  *                      containing numeric value of the current NFS blksize
1188  *                      setting;
1189  *                      return code is the size in bytes of the string
1190  *      On error:       return code is zero or a negative errno value
1191  */
1192 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1193 {
1194         char *mesg = buf;
1195         if (size > 0) {
1196                 int bsize;
1197                 int rv = get_int(&mesg, &bsize);
1198                 if (rv)
1199                         return rv;
1200                 /* force bsize into allowed range and
1201                  * required alignment.
1202                  */
1203                 if (bsize < 1024)
1204                         bsize = 1024;
1205                 if (bsize > NFSSVC_MAXBLKSIZE)
1206                         bsize = NFSSVC_MAXBLKSIZE;
1207                 bsize &= ~(1024-1);
1208                 mutex_lock(&nfsd_mutex);
1209                 if (nfsd_serv) {
1210                         mutex_unlock(&nfsd_mutex);
1211                         return -EBUSY;
1212                 }
1213                 nfsd_max_blksize = bsize;
1214                 mutex_unlock(&nfsd_mutex);
1215         }
1216
1217         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1218                                                         nfsd_max_blksize);
1219 }
1220
1221 #ifdef CONFIG_NFSD_V4
1222 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1223 {
1224         char *mesg = buf;
1225         int rv, i;
1226
1227         if (size > 0) {
1228                 if (nfsd_serv)
1229                         return -EBUSY;
1230                 rv = get_int(&mesg, &i);
1231                 if (rv)
1232                         return rv;
1233                 /*
1234                  * Some sanity checking.  We don't have a reason for
1235                  * these particular numbers, but problems with the
1236                  * extremes are:
1237                  *      - Too short: the briefest network outage may
1238                  *        cause clients to lose all their locks.  Also,
1239                  *        the frequent polling may be wasteful.
1240                  *      - Too long: do you really want reboot recovery
1241                  *        to take more than an hour?  Or to make other
1242                  *        clients wait an hour before being able to
1243                  *        revoke a dead client's locks?
1244                  */
1245                 if (i < 10 || i > 3600)
1246                         return -EINVAL;
1247                 *time = i;
1248         }
1249
1250         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1251 }
1252
1253 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1254 {
1255         ssize_t rv;
1256
1257         mutex_lock(&nfsd_mutex);
1258         rv = __nfsd4_write_time(file, buf, size, time);
1259         mutex_unlock(&nfsd_mutex);
1260         return rv;
1261 }
1262
1263 /**
1264  * write_leasetime - Set or report the current NFSv4 lease time
1265  *
1266  * Input:
1267  *                      buf:            ignored
1268  *                      size:           zero
1269  *
1270  * OR
1271  *
1272  * Input:
1273  *                      buf:            C string containing an unsigned
1274  *                                      integer value representing the new
1275  *                                      NFSv4 lease expiry time
1276  *                      size:           non-zero length of C string in @buf
1277  * Output:
1278  *      On success:     passed-in buffer filled with '\n'-terminated C
1279  *                      string containing unsigned integer value of the
1280  *                      current lease expiry time;
1281  *                      return code is the size in bytes of the string
1282  *      On error:       return code is zero or a negative errno value
1283  */
1284 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1285 {
1286         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1287 }
1288
1289 /**
1290  * write_gracetime - Set or report current NFSv4 grace period time
1291  *
1292  * As above, but sets the time of the NFSv4 grace period.
1293  *
1294  * Note this should never be set to less than the *previous*
1295  * lease-period time, but we don't try to enforce this.  (In the common
1296  * case (a new boot), we don't know what the previous lease time was
1297  * anyway.)
1298  */
1299 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1300 {
1301         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1302 }
1303
1304 extern char *nfs4_recoverydir(void);
1305
1306 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1307 {
1308         char *mesg = buf;
1309         char *recdir;
1310         int len, status;
1311
1312         if (size > 0) {
1313                 if (nfsd_serv)
1314                         return -EBUSY;
1315                 if (size > PATH_MAX || buf[size-1] != '\n')
1316                         return -EINVAL;
1317                 buf[size-1] = 0;
1318
1319                 recdir = mesg;
1320                 len = qword_get(&mesg, recdir, size);
1321                 if (len <= 0)
1322                         return -EINVAL;
1323
1324                 status = nfs4_reset_recoverydir(recdir);
1325                 if (status)
1326                         return status;
1327         }
1328
1329         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1330                                                         nfs4_recoverydir());
1331 }
1332
1333 /**
1334  * write_recoverydir - Set or report the pathname of the recovery directory
1335  *
1336  * Input:
1337  *                      buf:            ignored
1338  *                      size:           zero
1339  *
1340  * OR
1341  *
1342  * Input:
1343  *                      buf:            C string containing the pathname
1344  *                                      of the directory on a local file
1345  *                                      system containing permanent NFSv4
1346  *                                      recovery data
1347  *                      size:           non-zero length of C string in @buf
1348  * Output:
1349  *      On success:     passed-in buffer filled with '\n'-terminated C string
1350  *                      containing the current recovery pathname setting;
1351  *                      return code is the size in bytes of the string
1352  *      On error:       return code is zero or a negative errno value
1353  */
1354 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1355 {
1356         ssize_t rv;
1357
1358         mutex_lock(&nfsd_mutex);
1359         rv = __write_recoverydir(file, buf, size);
1360         mutex_unlock(&nfsd_mutex);
1361         return rv;
1362 }
1363
1364 #endif
1365
1366 /*----------------------------------------------------------------------------*/
1367 /*
1368  *      populating the filesystem.
1369  */
1370
1371 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1372 {
1373         static struct tree_descr nfsd_files[] = {
1374 #ifdef CONFIG_NFSD_DEPRECATED
1375                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1376                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1377                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1378                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1379                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1380                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1381                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1382 #endif
1383                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1384                 [NFSD_Export_features] = {"export_features",
1385                                         &export_features_operations, S_IRUGO},
1386                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1387                                         &transaction_ops, S_IWUSR|S_IRUSR},
1388                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1389                                         &transaction_ops, S_IWUSR|S_IRUSR},
1390                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1391                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1392                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1393                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1394                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1395                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1396                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1397 #ifdef CONFIG_NFSD_V4
1398                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1399                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1400                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1401 #endif
1402                 /* last one */ {""}
1403         };
1404         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1405 }
1406
1407 static int nfsd_get_sb(struct file_system_type *fs_type,
1408         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1409 {
1410         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1411 }
1412
1413 static struct file_system_type nfsd_fs_type = {
1414         .owner          = THIS_MODULE,
1415         .name           = "nfsd",
1416         .get_sb         = nfsd_get_sb,
1417         .kill_sb        = kill_litter_super,
1418 };
1419
1420 #ifdef CONFIG_PROC_FS
1421 static int create_proc_exports_entry(void)
1422 {
1423         struct proc_dir_entry *entry;
1424
1425         entry = proc_mkdir("fs/nfs", NULL);
1426         if (!entry)
1427                 return -ENOMEM;
1428         entry = proc_create("exports", 0, entry, &exports_operations);
1429         if (!entry)
1430                 return -ENOMEM;
1431         return 0;
1432 }
1433 #else /* CONFIG_PROC_FS */
1434 static int create_proc_exports_entry(void)
1435 {
1436         return 0;
1437 }
1438 #endif
1439
1440 static int __init init_nfsd(void)
1441 {
1442         int retval;
1443         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1444
1445         retval = nfs4_state_init(); /* nfs4 locking state */
1446         if (retval)
1447                 return retval;
1448         nfsd_stat_init();       /* Statistics */
1449         retval = nfsd_reply_cache_init();
1450         if (retval)
1451                 goto out_free_stat;
1452         retval = nfsd_export_init();
1453         if (retval)
1454                 goto out_free_cache;
1455         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1456         retval = nfsd_idmap_init();
1457         if (retval)
1458                 goto out_free_lockd;
1459         retval = create_proc_exports_entry();
1460         if (retval)
1461                 goto out_free_idmap;
1462         retval = register_filesystem(&nfsd_fs_type);
1463         if (retval)
1464                 goto out_free_all;
1465         return 0;
1466 out_free_all:
1467         remove_proc_entry("fs/nfs/exports", NULL);
1468         remove_proc_entry("fs/nfs", NULL);
1469 out_free_idmap:
1470         nfsd_idmap_shutdown();
1471 out_free_lockd:
1472         nfsd_lockd_shutdown();
1473         nfsd_export_shutdown();
1474 out_free_cache:
1475         nfsd_reply_cache_shutdown();
1476 out_free_stat:
1477         nfsd_stat_shutdown();
1478         nfsd4_free_slabs();
1479         return retval;
1480 }
1481
1482 static void __exit exit_nfsd(void)
1483 {
1484         nfsd_export_shutdown();
1485         nfsd_reply_cache_shutdown();
1486         remove_proc_entry("fs/nfs/exports", NULL);
1487         remove_proc_entry("fs/nfs", NULL);
1488         nfsd_stat_shutdown();
1489         nfsd_lockd_shutdown();
1490         nfsd_idmap_shutdown();
1491         nfsd4_free_slabs();
1492         unregister_filesystem(&nfsd_fs_type);
1493 }
1494
1495 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1496 MODULE_LICENSE("GPL");
1497 module_init(init_nfsd)
1498 module_exit(exit_nfsd)