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         NFSD_Svc,
  26         NFSD_Add,
  27         NFSD_Del,
  28         NFSD_Export,
  29         NFSD_Unexport,
  30         NFSD_Getfd,
  31         NFSD_Getfs,
  32         NFSD_List,
  33         NFSD_Export_features,
  34         NFSD_Fh,
  35         NFSD_FO_UnlockIP,
  36         NFSD_FO_UnlockFS,
  37         NFSD_Threads,
  38         NFSD_Pool_Threads,
  39         NFSD_Pool_Stats,
  40         NFSD_Versions,
  41         NFSD_Ports,
  42         NFSD_MaxBlkSize,
  43         /*
  44          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  45          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  46          */
  47 #ifdef CONFIG_NFSD_V4
  48         NFSD_Leasetime,
  49         NFSD_Gracetime,
  50         NFSD_RecoveryDir,
  51 #endif
  52 };
  53
  54 /*
  55  * write() for these nodes.
  56  */
  57 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  58 static ssize_t write_add(struct file *file, char *buf, size_t size);
  59 static ssize_t write_del(struct file *file, char *buf, size_t size);
  60 static ssize_t write_export(struct file *file, char *buf, size_t size);
  61 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  62 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  63 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  64 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  65 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  66 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  67 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  68 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  69 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  70 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  71 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  72 #ifdef CONFIG_NFSD_V4
  73 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  74 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  75 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  76 #endif
  77
  78 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  79         [NFSD_Svc] = write_svc,
  80         [NFSD_Add] = write_add,
  81         [NFSD_Del] = write_del,
  82         [NFSD_Export] = write_export,
  83         [NFSD_Unexport] = write_unexport,
  84         [NFSD_Getfd] = write_getfd,
  85         [NFSD_Getfs] = write_getfs,
  86         [NFSD_Fh] = write_filehandle,
  87         [NFSD_FO_UnlockIP] = write_unlock_ip,
  88         [NFSD_FO_UnlockFS] = write_unlock_fs,
  89         [NFSD_Threads] = write_threads,
  90         [NFSD_Pool_Threads] = write_pool_threads,
  91         [NFSD_Versions] = write_versions,
  92         [NFSD_Ports] = write_ports,
  93         [NFSD_MaxBlkSize] = write_maxblksize,
  94 #ifdef CONFIG_NFSD_V4
  95         [NFSD_Leasetime] = write_leasetime,
  96         [NFSD_Gracetime] = write_gracetime,
  97         [NFSD_RecoveryDir] = write_recoverydir,
  98 #endif
  99 };
 100
 101 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 102 {
 103         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 104         char *data;
 105         ssize_t rv;
 106
 107         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 108                 return -EINVAL;
 109
 110         data = simple_transaction_get(file, buf, size);
 111         if (IS_ERR(data))
 112                 return PTR_ERR(data);
 113
 114         rv =  write_op[ino](file, data, size);
 115         if (rv >= 0) {
 116                 simple_transaction_set(file, rv);
 117                 rv = size;
 118         }
 119         return rv;
 120 }
 121
 122 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 123 {
 124         if (! file->private_data) {
 125                 /* An attempt to read a transaction file without writing
 126                  * causes a 0-byte write so that the file can return
 127                  * state information
 128                  */
 129                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 130                 if (rv < 0)
 131                         return rv;
 132         }
 133         return simple_transaction_read(file, buf, size, pos);
 134 }
 135
 136 static const struct file_operations transaction_ops = {
 137         .write          = nfsctl_transaction_write,
 138         .read           = nfsctl_transaction_read,
 139         .release        = simple_transaction_release,
 140         .llseek         = default_llseek,
 141 };
 142
 143 static int exports_open(struct inode *inode, struct file *file)
 144 {
 145         return seq_open(file, &nfs_exports_op);
 146 }
 147
 148 static const struct file_operations exports_operations = {
 149         .open           = exports_open,
 150         .read           = seq_read,
 151         .llseek         = seq_lseek,
 152         .release        = seq_release,
 153         .owner          = THIS_MODULE,
 154 };
 155
 156 static int export_features_show(struct seq_file *m, void *v)
 157 {
 158         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 159         return 0;
 160 }
 161
 162 static int export_features_open(struct inode *inode, struct file *file)
 163 {
 164         return single_open(file, export_features_show, NULL);
 165 }
 166
 167 static struct file_operations export_features_operations = {
 168         .open           = export_features_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = single_release,
 172 };
 173
 174 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 175 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 176
 177 static const struct file_operations pool_stats_operations = {
 178         .open           = nfsd_pool_stats_open,
 179         .read           = seq_read,
 180         .llseek         = seq_lseek,
 181         .release        = nfsd_pool_stats_release,
 182         .owner          = THIS_MODULE,
 183 };
 184
 185 /*----------------------------------------------------------------------------*/
 186 /*
 187  * payload - write methods
 188  */
 189
 190 /**
 191  * write_svc - Start kernel's NFSD server
 192  *
 193  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 194  * Function remains to support old versions of nfs-utils.
 195  *
 196  * Input:
 197  *                      buf:    struct nfsctl_svc
 198  *                              svc_port:       port number of this
 199  *                                              server's listener
 200  *                              svc_nthreads:   number of threads to start
 201  *                      size:   size in bytes of passed in nfsctl_svc
 202  * Output:
 203  *      On success:     returns zero
 204  *      On error:       return code is negative errno value
 205  */
 206 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 207 {
 208         struct nfsctl_svc *data;
 209         int err;
 210         if (size < sizeof(*data))
 211                 return -EINVAL;
 212         data = (struct nfsctl_svc*) buf;
 213         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 214         if (err < 0)
 215                 return err;
 216         return 0;
 217 }
 218
 219 /**
 220  * write_add - Add or modify client entry in auth unix cache
 221  *
 222  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 223  * Function remains to support old versions of nfs-utils.
 224  *
 225  * Input:
 226  *                      buf:    struct nfsctl_client
 227  *                              cl_ident:       '\0'-terminated C string
 228  *                                              containing domain name
 229  *                                              of client
 230  *                              cl_naddr:       no. of items in cl_addrlist
 231  *                              cl_addrlist:    array of client addresses
 232  *                              cl_fhkeytype:   ignored
 233  *                              cl_fhkeylen:    ignored
 234  *                              cl_fhkey:       ignored
 235  *                      size:   size in bytes of passed in nfsctl_client
 236  * Output:
 237  *      On success:     returns zero
 238  *      On error:       return code is negative errno value
 239  *
 240  * Note: Only AF_INET client addresses are passed in, since
 241  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 242  */
 243 static ssize_t write_add(struct file *file, char *buf, size_t size)
 244 {
 245         struct nfsctl_client *data;
 246         if (size < sizeof(*data))
 247                 return -EINVAL;
 248         data = (struct nfsctl_client *)buf;
 249         return exp_addclient(data);
 250 }
 251
 252 /**
 253  * write_del - Remove client from auth unix cache
 254  *
 255  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 256  * Function remains to support old versions of nfs-utils.
 257  *
 258  * Input:
 259  *                      buf:    struct nfsctl_client
 260  *                              cl_ident:       '\0'-terminated C string
 261  *                                              containing domain name
 262  *                                              of client
 263  *                              cl_naddr:       ignored
 264  *                              cl_addrlist:    ignored
 265  *                              cl_fhkeytype:   ignored
 266  *                              cl_fhkeylen:    ignored
 267  *                              cl_fhkey:       ignored
 268  *                      size:   size in bytes of passed in nfsctl_client
 269  * Output:
 270  *      On success:     returns zero
 271  *      On error:       return code is negative errno value
 272  *
 273  * Note: Only AF_INET client addresses are passed in, since
 274  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 275  */
 276 static ssize_t write_del(struct file *file, char *buf, size_t size)
 277 {
 278         struct nfsctl_client *data;
 279         if (size < sizeof(*data))
 280                 return -EINVAL;
 281         data = (struct nfsctl_client *)buf;
 282         return exp_delclient(data);
 283 }
 284
 285 /**
 286  * write_export - Export part or all of a local file system
 287  *
 288  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 289  * Function remains to support old versions of nfs-utils.
 290  *
 291  * Input:
 292  *                      buf:    struct nfsctl_export
 293  *                              ex_client:      '\0'-terminated C string
 294  *                                              containing domain name
 295  *                                              of client allowed to access
 296  *                                              this export
 297  *                              ex_path:        '\0'-terminated C string
 298  *                                              containing pathname of
 299  *                                              directory in local file system
 300  *                              ex_dev:         fsid to use for this export
 301  *                              ex_ino:         ignored
 302  *                              ex_flags:       export flags for this export
 303  *                              ex_anon_uid:    UID to use for anonymous
 304  *                                              requests
 305  *                              ex_anon_gid:    GID to use for anonymous
 306  *                                              requests
 307  *                      size:   size in bytes of passed in nfsctl_export
 308  * Output:
 309  *      On success:     returns zero
 310  *      On error:       return code is negative errno value
 311  */
 312 static ssize_t write_export(struct file *file, char *buf, size_t size)
 313 {
 314         struct nfsctl_export *data;
 315         if (size < sizeof(*data))
 316                 return -EINVAL;
 317         data = (struct nfsctl_export*)buf;
 318         return exp_export(data);
 319 }
 320
 321 /**
 322  * write_unexport - Unexport a previously exported file system
 323  *
 324  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 325  * Function remains to support old versions of nfs-utils.
 326  *
 327  * Input:
 328  *                      buf:    struct nfsctl_export
 329  *                              ex_client:      '\0'-terminated C string
 330  *                                              containing domain name
 331  *                                              of client no longer allowed
 332  *                                              to access this export
 333  *                              ex_path:        '\0'-terminated C string
 334  *                                              containing pathname of
 335  *                                              directory in local file system
 336  *                              ex_dev:         ignored
 337  *                              ex_ino:         ignored
 338  *                              ex_flags:       ignored
 339  *                              ex_anon_uid:    ignored
 340  *                              ex_anon_gid:    ignored
 341  *                      size:   size in bytes of passed in nfsctl_export
 342  * Output:
 343  *      On success:     returns zero
 344  *      On error:       return code is negative errno value
 345  */
 346 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 347 {
 348         struct nfsctl_export *data;
 349
 350         if (size < sizeof(*data))
 351                 return -EINVAL;
 352         data = (struct nfsctl_export*)buf;
 353         return exp_unexport(data);
 354 }
 355
 356 /**
 357  * write_getfs - Get a variable-length NFS file handle by path
 358  *
 359  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 360  * Function remains to support old versions of nfs-utils.
 361  *
 362  * Input:
 363  *                      buf:    struct nfsctl_fsparm
 364  *                              gd_addr:        socket address of client
 365  *                              gd_path:        '\0'-terminated C string
 366  *                                              containing pathname of
 367  *                                              directory in local file system
 368  *                              gd_maxlen:      maximum size of returned file
 369  *                                              handle
 370  *                      size:   size in bytes of passed in nfsctl_fsparm
 371  * Output:
 372  *      On success:     passed-in buffer filled with a knfsd_fh structure
 373  *                      (a variable-length raw NFS file handle);
 374  *                      return code is the size in bytes of the file handle
 375  *      On error:       return code is negative errno value
 376  *
 377  * Note: Only AF_INET client addresses are passed in, since gd_addr
 378  * is the same size as a struct sockaddr_in.
 379  */
 380 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 381 {
 382         struct nfsctl_fsparm *data;
 383         struct sockaddr_in *sin;
 384         struct auth_domain *clp;
 385         int err = 0;
 386         struct knfsd_fh *res;
 387         struct in6_addr in6;
 388
 389         if (size < sizeof(*data))
 390                 return -EINVAL;
 391         data = (struct nfsctl_fsparm*)buf;
 392         err = -EPROTONOSUPPORT;
 393         if (data->gd_addr.sa_family != AF_INET)
 394                 goto out;
 395         sin = (struct sockaddr_in *)&data->gd_addr;
 396         if (data->gd_maxlen > NFS3_FHSIZE)
 397                 data->gd_maxlen = NFS3_FHSIZE;
 398
 399         res = (struct knfsd_fh*)buf;
 400
 401         exp_readlock();
 402
 403         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 404
 405         clp = auth_unix_lookup(&in6);
 406         if (!clp)
 407                 err = -EPERM;
 408         else {
 409                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 410                 auth_domain_put(clp);
 411         }
 412         exp_readunlock();
 413         if (err == 0)
 414                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 415  out:
 416         return err;
 417 }
 418
 419 /**
 420  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 421  *
 422  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 423  * Function remains to support old versions of nfs-utils.
 424  *
 425  * Input:
 426  *                      buf:    struct nfsctl_fdparm
 427  *                              gd_addr:        socket address of client
 428  *                              gd_path:        '\0'-terminated C string
 429  *                                              containing pathname of
 430  *                                              directory in local file system
 431  *                              gd_version:     fdparm structure version
 432  *                      size:   size in bytes of passed in nfsctl_fdparm
 433  * Output:
 434  *      On success:     passed-in buffer filled with nfsctl_res
 435  *                      (a fixed-length raw NFS file handle);
 436  *                      return code is the size in bytes of the file handle
 437  *      On error:       return code is negative errno value
 438  *
 439  * Note: Only AF_INET client addresses are passed in, since gd_addr
 440  * is the same size as a struct sockaddr_in.
 441  */
 442 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 443 {
 444         struct nfsctl_fdparm *data;
 445         struct sockaddr_in *sin;
 446         struct auth_domain *clp;
 447         int err = 0;
 448         struct knfsd_fh fh;
 449         char *res;
 450         struct in6_addr in6;
 451
 452         if (size < sizeof(*data))
 453                 return -EINVAL;
 454         data = (struct nfsctl_fdparm*)buf;
 455         err = -EPROTONOSUPPORT;
 456         if (data->gd_addr.sa_family != AF_INET)
 457                 goto out;
 458         err = -EINVAL;
 459         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 460                 goto out;
 461
 462         res = buf;
 463         sin = (struct sockaddr_in *)&data->gd_addr;
 464         exp_readlock();
 465
 466         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 467
 468         clp = auth_unix_lookup(&in6);
 469         if (!clp)
 470                 err = -EPERM;
 471         else {
 472                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 473                 auth_domain_put(clp);
 474         }
 475         exp_readunlock();
 476
 477         if (err == 0) {
 478                 memset(res,0, NFS_FHSIZE);
 479                 memcpy(res, &fh.fh_base, fh.fh_size);
 480                 err = NFS_FHSIZE;
 481         }
 482  out:
 483         return err;
 484 }
 485
 486 /**
 487  * write_unlock_ip - Release all locks used by a client
 488  *
 489  * Experimental.
 490  *
 491  * Input:
 492  *                      buf:    '\n'-terminated C string containing a
 493  *                              presentation format IP address
 494  *                      size:   length of C string in @buf
 495  * Output:
 496  *      On success:     returns zero if all specified locks were released;
 497  *                      returns one if one or more locks were not released
 498  *      On error:       return code is negative errno value
 499  */
 500 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 501 {
 502         struct sockaddr_storage address;
 503         struct sockaddr *sap = (struct sockaddr *)&address;
 504         size_t salen = sizeof(address);
 505         char *fo_path;
 506
 507         /* sanity check */
 508         if (size == 0)
 509                 return -EINVAL;
 510
 511         if (buf[size-1] != '\n')
 512                 return -EINVAL;
 513
 514         fo_path = buf;
 515         if (qword_get(&buf, fo_path, size) < 0)
 516                 return -EINVAL;
 517
 518         if (rpc_pton(fo_path, size, sap, salen) == 0)
 519                 return -EINVAL;
 520
 521         return nlmsvc_unlock_all_by_ip(sap);
 522 }
 523
 524 /**
 525  * write_unlock_fs - Release all locks on a local file system
 526  *
 527  * Experimental.
 528  *
 529  * Input:
 530  *                      buf:    '\n'-terminated C string containing the
 531  *                              absolute pathname of a local file system
 532  *                      size:   length of C string in @buf
 533  * Output:
 534  *      On success:     returns zero if all specified locks were released;
 535  *                      returns one if one or more locks were not released
 536  *      On error:       return code is negative errno value
 537  */
 538 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 539 {
 540         struct path path;
 541         char *fo_path;
 542         int error;
 543
 544         /* sanity check */
 545         if (size == 0)
 546                 return -EINVAL;
 547
 548         if (buf[size-1] != '\n')
 549                 return -EINVAL;
 550
 551         fo_path = buf;
 552         if (qword_get(&buf, fo_path, size) < 0)
 553                 return -EINVAL;
 554
 555         error = kern_path(fo_path, 0, &path);
 556         if (error)
 557                 return error;
 558
 559         /*
 560          * XXX: Needs better sanity checking.  Otherwise we could end up
 561          * releasing locks on the wrong file system.
 562          *
 563          * For example:
 564          * 1.  Does the path refer to a directory?
 565          * 2.  Is that directory a mount point, or
 566          * 3.  Is that directory the root of an exported file system?
 567          */
 568         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 569
 570         path_put(&path);
 571         return error;
 572 }
 573
 574 /**
 575  * write_filehandle - Get a variable-length NFS file handle by path
 576  *
 577  * On input, the buffer contains a '\n'-terminated C string comprised of
 578  * three alphanumeric words separated by whitespace.  The string may
 579  * contain escape sequences.
 580  *
 581  * Input:
 582  *                      buf:
 583  *                              domain:         client domain name
 584  *                              path:           export pathname
 585  *                              maxsize:        numeric maximum size of
 586  *                                              @buf
 587  *                      size:   length of C string in @buf
 588  * Output:
 589  *      On success:     passed-in buffer filled with '\n'-terminated C
 590  *                      string containing a ASCII hex text version
 591  *                      of the NFS file handle;
 592  *                      return code is the size in bytes of the string
 593  *      On error:       return code is negative errno value
 594  */
 595 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 596 {
 597         char *dname, *path;
 598         int uninitialized_var(maxsize);
 599         char *mesg = buf;
 600         int len;
 601         struct auth_domain *dom;
 602         struct knfsd_fh fh;
 603
 604         if (size == 0)
 605                 return -EINVAL;
 606
 607         if (buf[size-1] != '\n')
 608                 return -EINVAL;
 609         buf[size-1] = 0;
 610
 611         dname = mesg;
 612         len = qword_get(&mesg, dname, size);
 613         if (len <= 0)
 614                 return -EINVAL;
 615
 616         path = dname+len+1;
 617         len = qword_get(&mesg, path, size);
 618         if (len <= 0)
 619                 return -EINVAL;
 620
 621         len = get_int(&mesg, &maxsize);
 622         if (len)
 623                 return len;
 624
 625         if (maxsize < NFS_FHSIZE)
 626                 return -EINVAL;
 627         if (maxsize > NFS3_FHSIZE)
 628                 maxsize = NFS3_FHSIZE;
 629
 630         if (qword_get(&mesg, mesg, size)>0)
 631                 return -EINVAL;
 632
 633         /* we have all the words, they are in buf.. */
 634         dom = unix_domain_find(dname);
 635         if (!dom)
 636                 return -ENOMEM;
 637
 638         len = exp_rootfh(dom, path, &fh,  maxsize);
 639         auth_domain_put(dom);
 640         if (len)
 641                 return len;
 642
 643         mesg = buf;
 644         len = SIMPLE_TRANSACTION_LIMIT;
 645         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 646         mesg[-1] = '\n';
 647         return mesg - buf;
 648 }
 649
 650 /**
 651  * write_threads - Start NFSD, or report the current number of running threads
 652  *
 653  * Input:
 654  *                      buf:            ignored
 655  *                      size:           zero
 656  * Output:
 657  *      On success:     passed-in buffer filled with '\n'-terminated C
 658  *                      string numeric value representing the number of
 659  *                      running NFSD threads;
 660  *                      return code is the size in bytes of the string
 661  *      On error:       return code is zero
 662  *
 663  * OR
 664  *
 665  * Input:
 666  *                      buf:            C string containing an unsigned
 667  *                                      integer value representing the
 668  *                                      number of NFSD threads to start
 669  *                      size:           non-zero length of C string in @buf
 670  * Output:
 671  *      On success:     NFS service is started;
 672  *                      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 or a negative errno value
 677  */
 678 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 679 {
 680         char *mesg = buf;
 681         int rv;
 682         if (size > 0) {
 683                 int newthreads;
 684                 rv = get_int(&mesg, &newthreads);
 685                 if (rv)
 686                         return rv;
 687                 if (newthreads < 0)
 688                         return -EINVAL;
 689                 rv = nfsd_svc(NFS_PORT, newthreads);
 690                 if (rv < 0)
 691                         return rv;
 692         } else
 693                 rv = nfsd_nrthreads();
 694
 695         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 696 }
 697
 698 /**
 699  * write_pool_threads - Set or report the current number of threads per pool
 700  *
 701  * Input:
 702  *                      buf:            ignored
 703  *                      size:           zero
 704  *
 705  * OR
 706  *
 707  * Input:
 708  *                      buf:            C string containing whitespace-
 709  *                                      separated unsigned integer values
 710  *                                      representing the number of NFSD
 711  *                                      threads to start in each pool
 712  *                      size:           non-zero length of C string in @buf
 713  * Output:
 714  *      On success:     passed-in buffer filled with '\n'-terminated C
 715  *                      string containing integer values representing the
 716  *                      number of NFSD threads in each pool;
 717  *                      return code is the size in bytes of the string
 718  *      On error:       return code is zero or a negative errno value
 719  */
 720 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 721 {
 722         /* if size > 0, look for an array of number of threads per node
 723          * and apply them  then write out number of threads per node as reply
 724          */
 725         char *mesg = buf;
 726         int i;
 727         int rv;
 728         int len;
 729         int npools;
 730         int *nthreads;
 731
 732         mutex_lock(&nfsd_mutex);
 733         npools = nfsd_nrpools();
 734         if (npools == 0) {
 735                 /*
 736                  * NFS is shut down.  The admin can start it by
 737                  * writing to the threads file but NOT the pool_threads
 738                  * file, sorry.  Report zero threads.
 739                  */
 740                 mutex_unlock(&nfsd_mutex);
 741                 strcpy(buf, "0\n");
 742                 return strlen(buf);
 743         }
 744
 745         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 746         rv = -ENOMEM;
 747         if (nthreads == NULL)
 748                 goto out_free;
 749
 750         if (size > 0) {
 751                 for (i = 0; i < npools; i++) {
 752                         rv = get_int(&mesg, &nthreads[i]);
 753                         if (rv == -ENOENT)
 754                                 break;          /* fewer numbers than pools */
 755                         if (rv)
 756                                 goto out_free;  /* syntax error */
 757                         rv = -EINVAL;
 758                         if (nthreads[i] < 0)
 759                                 goto out_free;
 760                 }
 761                 rv = nfsd_set_nrthreads(i, nthreads);
 762                 if (rv)
 763                         goto out_free;
 764         }
 765
 766         rv = nfsd_get_nrthreads(npools, nthreads);
 767         if (rv)
 768                 goto out_free;
 769
 770         mesg = buf;
 771         size = SIMPLE_TRANSACTION_LIMIT;
 772         for (i = 0; i < npools && size > 0; i++) {
 773                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 774                 len = strlen(mesg);
 775                 size -= len;
 776                 mesg += len;
 777         }
 778         rv = mesg - buf;
 779 out_free:
 780         kfree(nthreads);
 781         mutex_unlock(&nfsd_mutex);
 782         return rv;
 783 }
 784
 785 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 786 {
 787         char *mesg = buf;
 788         char *vers, *minorp, sign;
 789         int len, num, remaining;
 790         unsigned minor;
 791         ssize_t tlen = 0;
 792         char *sep;
 793
 794         if (size>0) {
 795                 if (nfsd_serv)
 796                         /* Cannot change versions without updating
 797                          * nfsd_serv->sv_xdrsize, and reallocing
 798                          * rq_argp and rq_resp
 799                          */
 800                         return -EBUSY;
 801                 if (buf[size-1] != '\n')
 802                         return -EINVAL;
 803                 buf[size-1] = 0;
 804
 805                 vers = mesg;
 806                 len = qword_get(&mesg, vers, size);
 807                 if (len <= 0) return -EINVAL;
 808                 do {
 809                         sign = *vers;
 810                         if (sign == '+' || sign == '-')
 811                                 num = simple_strtol((vers+1), &minorp, 0);
 812                         else
 813                                 num = simple_strtol(vers, &minorp, 0);
 814                         if (*minorp == '.') {
 815                                 if (num < 4)
 816                                         return -EINVAL;
 817                                 minor = simple_strtoul(minorp+1, NULL, 0);
 818                                 if (minor == 0)
 819                                         return -EINVAL;
 820                                 if (nfsd_minorversion(minor, sign == '-' ?
 821                                                      NFSD_CLEAR : NFSD_SET) < 0)
 822                                         return -EINVAL;
 823                                 goto next;
 824                         }
 825                         switch(num) {
 826                         case 2:
 827                         case 3:
 828                         case 4:
 829                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 830                                 break;
 831                         default:
 832                                 return -EINVAL;
 833                         }
 834                 next:
 835                         vers += len + 1;
 836                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 837                 /* If all get turned off, turn them back on, as
 838                  * having no versions is BAD
 839                  */
 840                 nfsd_reset_versions();
 841         }
 842
 843         /* Now write current state into reply buffer */
 844         len = 0;
 845         sep = "";
 846         remaining = SIMPLE_TRANSACTION_LIMIT;
 847         for (num=2 ; num <= 4 ; num++)
 848                 if (nfsd_vers(num, NFSD_AVAIL)) {
 849                         len = snprintf(buf, remaining, "%s%c%d", sep,
 850                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 851                                        num);
 852                         sep = " ";
 853
 854                         if (len > remaining)
 855                                 break;
 856                         remaining -= len;
 857                         buf += len;
 858                         tlen += len;
 859                 }
 860         if (nfsd_vers(4, NFSD_AVAIL))
 861                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 862                      minor++) {
 863                         len = snprintf(buf, remaining, " %c4.%u",
 864                                         (nfsd_vers(4, NFSD_TEST) &&
 865                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 866                                                 '+' : '-',
 867                                         minor);
 868
 869                         if (len > remaining)
 870                                 break;
 871                         remaining -= len;
 872                         buf += len;
 873                         tlen += len;
 874                 }
 875
 876         len = snprintf(buf, remaining, "\n");
 877         if (len > remaining)
 878                 return -EINVAL;
 879         return tlen + len;
 880 }
 881
 882 /**
 883  * write_versions - Set or report the available NFS protocol versions
 884  *
 885  * Input:
 886  *                      buf:            ignored
 887  *                      size:           zero
 888  * Output:
 889  *      On success:     passed-in buffer filled with '\n'-terminated C
 890  *                      string containing positive or negative integer
 891  *                      values representing the current status of each
 892  *                      protocol version;
 893  *                      return code is the size in bytes of the string
 894  *      On error:       return code is zero or a negative errno value
 895  *
 896  * OR
 897  *
 898  * Input:
 899  *                      buf:            C string containing whitespace-
 900  *                                      separated positive or negative
 901  *                                      integer values representing NFS
 902  *                                      protocol versions to enable ("+n")
 903  *                                      or disable ("-n")
 904  *                      size:           non-zero length of C string in @buf
 905  * Output:
 906  *      On success:     status of zero or more protocol versions has
 907  *                      been updated; passed-in buffer filled with
 908  *                      '\n'-terminated C string containing positive
 909  *                      or negative integer values representing the
 910  *                      current status of each 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 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 915 {
 916         ssize_t rv;
 917
 918         mutex_lock(&nfsd_mutex);
 919         rv = __write_versions(file, buf, size);
 920         mutex_unlock(&nfsd_mutex);
 921         return rv;
 922 }
 923
 924 /*
 925  * Zero-length write.  Return a list of NFSD's current listener
 926  * transports.
 927  */
 928 static ssize_t __write_ports_names(char *buf)
 929 {
 930         if (nfsd_serv == NULL)
 931                 return 0;
 932         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 933 }
 934
 935 /*
 936  * A single 'fd' number was written, in which case it must be for
 937  * a socket of a supported family/protocol, and we use it as an
 938  * nfsd listener.
 939  */
 940 static ssize_t __write_ports_addfd(char *buf)
 941 {
 942         char *mesg = buf;
 943         int fd, err;
 944
 945         err = get_int(&mesg, &fd);
 946         if (err != 0 || fd < 0)
 947                 return -EINVAL;
 948
 949         err = nfsd_create_serv();
 950         if (err != 0)
 951                 return err;
 952
 953         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 954         if (err < 0) {
 955                 svc_destroy(nfsd_serv);
 956                 return err;
 957         }
 958
 959         /* Decrease the count, but don't shut down the service */
 960         nfsd_serv->sv_nrthreads--;
 961         return err;
 962 }
 963
 964 /*
 965  * A '-' followed by the 'name' of a socket means we close the socket.
 966  */
 967 static ssize_t __write_ports_delfd(char *buf)
 968 {
 969         char *toclose;
 970         int len = 0;
 971
 972         toclose = kstrdup(buf + 1, GFP_KERNEL);
 973         if (toclose == NULL)
 974                 return -ENOMEM;
 975
 976         if (nfsd_serv != NULL)
 977                 len = svc_sock_names(nfsd_serv, buf,
 978                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 979         kfree(toclose);
 980         return len;
 981 }
 982
 983 /*
 984  * A transport listener is added by writing it's transport name and
 985  * a port number.
 986  */
 987 static ssize_t __write_ports_addxprt(char *buf)
 988 {
 989         char transport[16];
 990         struct svc_xprt *xprt;
 991         int port, err;
 992
 993         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 994                 return -EINVAL;
 995
 996         if (port < 1 || port > USHRT_MAX)
 997                 return -EINVAL;
 998
 999         err = nfsd_create_serv();
1000         if (err != 0)
1001                 return err;
1002
1003         err = svc_create_xprt(nfsd_serv, transport,
1004                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1005         if (err < 0)
1006                 goto out_err;
1007
1008         err = svc_create_xprt(nfsd_serv, transport,
1009                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1010         if (err < 0 && err != -EAFNOSUPPORT)
1011                 goto out_close;
1012
1013         /* Decrease the count, but don't shut down the service */
1014         nfsd_serv->sv_nrthreads--;
1015         return 0;
1016 out_close:
1017         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1018         if (xprt != NULL) {
1019                 svc_close_xprt(xprt);
1020                 svc_xprt_put(xprt);
1021         }
1022 out_err:
1023         svc_destroy(nfsd_serv);
1024         return err;
1025 }
1026
1027 /*
1028  * A transport listener is removed by writing a "-", it's transport
1029  * name, and it's port number.
1030  */
1031 static ssize_t __write_ports_delxprt(char *buf)
1032 {
1033         struct svc_xprt *xprt;
1034         char transport[16];
1035         int port;
1036
1037         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1038                 return -EINVAL;
1039
1040         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1041                 return -EINVAL;
1042
1043         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1044         if (xprt == NULL)
1045                 return -ENOTCONN;
1046
1047         svc_close_xprt(xprt);
1048         svc_xprt_put(xprt);
1049         return 0;
1050 }
1051
1052 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1053 {
1054         if (size == 0)
1055                 return __write_ports_names(buf);
1056
1057         if (isdigit(buf[0]))
1058                 return __write_ports_addfd(buf);
1059
1060         if (buf[0] == '-' && isdigit(buf[1]))
1061                 return __write_ports_delfd(buf);
1062
1063         if (isalpha(buf[0]))
1064                 return __write_ports_addxprt(buf);
1065
1066         if (buf[0] == '-' && isalpha(buf[1]))
1067                 return __write_ports_delxprt(buf);
1068
1069         return -EINVAL;
1070 }
1071
1072 /**
1073  * write_ports - Pass a socket file descriptor or transport name to listen on
1074  *
1075  * Input:
1076  *                      buf:            ignored
1077  *                      size:           zero
1078  * Output:
1079  *      On success:     passed-in buffer filled with a '\n'-terminated C
1080  *                      string containing a whitespace-separated list of
1081  *                      named NFSD listeners;
1082  *                      return code is the size in bytes of the string
1083  *      On error:       return code is zero or a negative errno value
1084  *
1085  * OR
1086  *
1087  * Input:
1088  *                      buf:            C string containing an unsigned
1089  *                                      integer value representing a bound
1090  *                                      but unconnected socket that is to be
1091  *                                      used as an NFSD listener; listen(3)
1092  *                                      must be called for a SOCK_STREAM
1093  *                                      socket, otherwise it is ignored
1094  *                      size:           non-zero length of C string in @buf
1095  * Output:
1096  *      On success:     NFS service is started;
1097  *                      passed-in buffer filled with a '\n'-terminated C
1098  *                      string containing a unique alphanumeric name of
1099  *                      the listener;
1100  *                      return code is the size in bytes of the string
1101  *      On error:       return code is a negative errno value
1102  *
1103  * OR
1104  *
1105  * Input:
1106  *                      buf:            C string containing a "-" followed
1107  *                                      by an integer value representing a
1108  *                                      previously passed in socket file
1109  *                                      descriptor
1110  *                      size:           non-zero length of C string in @buf
1111  * Output:
1112  *      On success:     NFS service no longer listens on that socket;
1113  *                      passed-in buffer filled with a '\n'-terminated C
1114  *                      string containing a unique name of 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 transport
1122  *                                      name and an unsigned integer value
1123  *                                      representing the port to listen on,
1124  *                                      separated by whitespace
1125  *                      size:           non-zero length of C string in @buf
1126  * Output:
1127  *      On success:     returns zero; NFS service is started
1128  *      On error:       return code is a negative errno value
1129  *
1130  * OR
1131  *
1132  * Input:
1133  *                      buf:            C string containing a "-" followed
1134  *                                      by a transport name and an unsigned
1135  *                                      integer value representing the port
1136  *                                      to listen on, separated by whitespace
1137  *                      size:           non-zero length of C string in @buf
1138  * Output:
1139  *      On success:     returns zero; NFS service no longer listens
1140  *                      on that transport
1141  *      On error:       return code is a negative errno value
1142  */
1143 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1144 {
1145         ssize_t rv;
1146
1147         mutex_lock(&nfsd_mutex);
1148         rv = __write_ports(file, buf, size);
1149         mutex_unlock(&nfsd_mutex);
1150         return rv;
1151 }
1152
1153
1154 int nfsd_max_blksize;
1155
1156 /**
1157  * write_maxblksize - Set or report the current NFS blksize
1158  *
1159  * Input:
1160  *                      buf:            ignored
1161  *                      size:           zero
1162  *
1163  * OR
1164  *
1165  * Input:
1166  *                      buf:            C string containing an unsigned
1167  *                                      integer value representing the new
1168  *                                      NFS blksize
1169  *                      size:           non-zero length of C string in @buf
1170  * Output:
1171  *      On success:     passed-in buffer filled with '\n'-terminated C string
1172  *                      containing numeric value of the current NFS blksize
1173  *                      setting;
1174  *                      return code is the size in bytes of the string
1175  *      On error:       return code is zero or a negative errno value
1176  */
1177 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1178 {
1179         char *mesg = buf;
1180         if (size > 0) {
1181                 int bsize;
1182                 int rv = get_int(&mesg, &bsize);
1183                 if (rv)
1184                         return rv;
1185                 /* force bsize into allowed range and
1186                  * required alignment.
1187                  */
1188                 if (bsize < 1024)
1189                         bsize = 1024;
1190                 if (bsize > NFSSVC_MAXBLKSIZE)
1191                         bsize = NFSSVC_MAXBLKSIZE;
1192                 bsize &= ~(1024-1);
1193                 mutex_lock(&nfsd_mutex);
1194                 if (nfsd_serv) {
1195                         mutex_unlock(&nfsd_mutex);
1196                         return -EBUSY;
1197                 }
1198                 nfsd_max_blksize = bsize;
1199                 mutex_unlock(&nfsd_mutex);
1200         }
1201
1202         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1203                                                         nfsd_max_blksize);
1204 }
1205
1206 #ifdef CONFIG_NFSD_V4
1207 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1208 {
1209         char *mesg = buf;
1210         int rv, i;
1211
1212         if (size > 0) {
1213                 if (nfsd_serv)
1214                         return -EBUSY;
1215                 rv = get_int(&mesg, &i);
1216                 if (rv)
1217                         return rv;
1218                 /*
1219                  * Some sanity checking.  We don't have a reason for
1220                  * these particular numbers, but problems with the
1221                  * extremes are:
1222                  *      - Too short: the briefest network outage may
1223                  *        cause clients to lose all their locks.  Also,
1224                  *        the frequent polling may be wasteful.
1225                  *      - Too long: do you really want reboot recovery
1226                  *        to take more than an hour?  Or to make other
1227                  *        clients wait an hour before being able to
1228                  *        revoke a dead client's locks?
1229                  */
1230                 if (i < 10 || i > 3600)
1231                         return -EINVAL;
1232                 *time = i;
1233         }
1234
1235         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1236 }
1237
1238 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1239 {
1240         ssize_t rv;
1241
1242         mutex_lock(&nfsd_mutex);
1243         rv = __nfsd4_write_time(file, buf, size, time);
1244         mutex_unlock(&nfsd_mutex);
1245         return rv;
1246 }
1247
1248 /**
1249  * write_leasetime - Set or report the current NFSv4 lease time
1250  *
1251  * Input:
1252  *                      buf:            ignored
1253  *                      size:           zero
1254  *
1255  * OR
1256  *
1257  * Input:
1258  *                      buf:            C string containing an unsigned
1259  *                                      integer value representing the new
1260  *                                      NFSv4 lease expiry time
1261  *                      size:           non-zero length of C string in @buf
1262  * Output:
1263  *      On success:     passed-in buffer filled with '\n'-terminated C
1264  *                      string containing unsigned integer value of the
1265  *                      current lease expiry time;
1266  *                      return code is the size in bytes of the string
1267  *      On error:       return code is zero or a negative errno value
1268  */
1269 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1270 {
1271         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1272 }
1273
1274 /**
1275  * write_gracetime - Set or report current NFSv4 grace period time
1276  *
1277  * As above, but sets the time of the NFSv4 grace period.
1278  *
1279  * Note this should never be set to less than the *previous*
1280  * lease-period time, but we don't try to enforce this.  (In the common
1281  * case (a new boot), we don't know what the previous lease time was
1282  * anyway.)
1283  */
1284 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1285 {
1286         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1287 }
1288
1289 extern char *nfs4_recoverydir(void);
1290
1291 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1292 {
1293         char *mesg = buf;
1294         char *recdir;
1295         int len, status;
1296
1297         if (size > 0) {
1298                 if (nfsd_serv)
1299                         return -EBUSY;
1300                 if (size > PATH_MAX || buf[size-1] != '\n')
1301                         return -EINVAL;
1302                 buf[size-1] = 0;
1303
1304                 recdir = mesg;
1305                 len = qword_get(&mesg, recdir, size);
1306                 if (len <= 0)
1307                         return -EINVAL;
1308
1309                 status = nfs4_reset_recoverydir(recdir);
1310                 if (status)
1311                         return status;
1312         }
1313
1314         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1315                                                         nfs4_recoverydir());
1316 }
1317
1318 /**
1319  * write_recoverydir - Set or report the pathname of the recovery directory
1320  *
1321  * Input:
1322  *                      buf:            ignored
1323  *                      size:           zero
1324  *
1325  * OR
1326  *
1327  * Input:
1328  *                      buf:            C string containing the pathname
1329  *                                      of the directory on a local file
1330  *                                      system containing permanent NFSv4
1331  *                                      recovery data
1332  *                      size:           non-zero length of C string in @buf
1333  * Output:
1334  *      On success:     passed-in buffer filled with '\n'-terminated C string
1335  *                      containing the current recovery pathname setting;
1336  *                      return code is the size in bytes of the string
1337  *      On error:       return code is zero or a negative errno value
1338  */
1339 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1340 {
1341         ssize_t rv;
1342
1343         mutex_lock(&nfsd_mutex);
1344         rv = __write_recoverydir(file, buf, size);
1345         mutex_unlock(&nfsd_mutex);
1346         return rv;
1347 }
1348
1349 #endif
1350
1351 /*----------------------------------------------------------------------------*/
1352 /*
1353  *      populating the filesystem.
1354  */
1355
1356 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1357 {
1358         static struct tree_descr nfsd_files[] = {
1359                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1360                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1361                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1362                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1363                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1364                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1365                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1366                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1367                 [NFSD_Export_features] = {"export_features",
1368                                         &export_features_operations, S_IRUGO},
1369                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1370                                         &transaction_ops, S_IWUSR|S_IRUSR},
1371                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1372                                         &transaction_ops, S_IWUSR|S_IRUSR},
1373                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1374                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1375                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1376                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1377                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1378                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1379                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1380 #ifdef CONFIG_NFSD_V4
1381                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1382                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1383                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1384 #endif
1385                 /* last one */ {""}
1386         };
1387         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1388 }
1389
1390 static int nfsd_get_sb(struct file_system_type *fs_type,
1391         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1392 {
1393         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1394 }
1395
1396 static struct file_system_type nfsd_fs_type = {
1397         .owner          = THIS_MODULE,
1398         .name           = "nfsd",
1399         .get_sb         = nfsd_get_sb,
1400         .kill_sb        = kill_litter_super,
1401 };
1402
1403 #ifdef CONFIG_PROC_FS
1404 static int create_proc_exports_entry(void)
1405 {
1406         struct proc_dir_entry *entry;
1407
1408         entry = proc_mkdir("fs/nfs", NULL);
1409         if (!entry)
1410                 return -ENOMEM;
1411         entry = proc_create("exports", 0, entry, &exports_operations);
1412         if (!entry)
1413                 return -ENOMEM;
1414         return 0;
1415 }
1416 #else /* CONFIG_PROC_FS */
1417 static int create_proc_exports_entry(void)
1418 {
1419         return 0;
1420 }
1421 #endif
1422
1423 static int __init init_nfsd(void)
1424 {
1425         int retval;
1426         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1427
1428         retval = nfs4_state_init(); /* nfs4 locking state */
1429         if (retval)
1430                 return retval;
1431         nfsd_stat_init();       /* Statistics */
1432         retval = nfsd_reply_cache_init();
1433         if (retval)
1434                 goto out_free_stat;
1435         retval = nfsd_export_init();
1436         if (retval)
1437                 goto out_free_cache;
1438         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1439         retval = nfsd_idmap_init();
1440         if (retval)
1441                 goto out_free_lockd;
1442         retval = create_proc_exports_entry();
1443         if (retval)
1444                 goto out_free_idmap;
1445         retval = register_filesystem(&nfsd_fs_type);
1446         if (retval)
1447                 goto out_free_all;
1448         return 0;
1449 out_free_all:
1450         remove_proc_entry("fs/nfs/exports", NULL);
1451         remove_proc_entry("fs/nfs", NULL);
1452 out_free_idmap:
1453         nfsd_idmap_shutdown();
1454 out_free_lockd:
1455         nfsd_lockd_shutdown();
1456         nfsd_export_shutdown();
1457 out_free_cache:
1458         nfsd_reply_cache_shutdown();
1459 out_free_stat:
1460         nfsd_stat_shutdown();
1461         nfsd4_free_slabs();
1462         return retval;
1463 }
1464
1465 static void __exit exit_nfsd(void)
1466 {
1467         nfsd_export_shutdown();
1468         nfsd_reply_cache_shutdown();
1469         remove_proc_entry("fs/nfs/exports", NULL);
1470         remove_proc_entry("fs/nfs", NULL);
1471         nfsd_stat_shutdown();
1472         nfsd_lockd_shutdown();
1473         nfsd_idmap_shutdown();
1474         nfsd4_free_slabs();
1475         unregister_filesystem(&nfsd_fs_type);
1476 }
1477
1478 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1479 MODULE_LICENSE("GPL");
1480 module_init(init_nfsd)
1481 module_exit(exit_nfsd)