release/src-rt-6.x.4708/linux/linux-2.6.36/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 };
 141
 142 static int exports_open(struct inode *inode, struct file *file)
 143 {
 144         return seq_open(file, &nfs_exports_op);
 145 }
 146
 147 static const struct file_operations exports_operations = {
 148         .open           = exports_open,
 149         .read           = seq_read,
 150         .llseek         = seq_lseek,
 151         .release        = seq_release,
 152         .owner          = THIS_MODULE,
 153 };
 154
 155 static int export_features_show(struct seq_file *m, void *v)
 156 {
 157         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 158         return 0;
 159 }
 160
 161 static int export_features_open(struct inode *inode, struct file *file)
 162 {
 163         return single_open(file, export_features_show, NULL);
 164 }
 165
 166 static struct file_operations export_features_operations = {
 167         .open           = export_features_open,
 168         .read           = seq_read,
 169         .llseek         = seq_lseek,
 170         .release        = single_release,
 171 };
 172
 173 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 174 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 175
 176 static const struct file_operations pool_stats_operations = {
 177         .open           = nfsd_pool_stats_open,
 178         .read           = seq_read,
 179         .llseek         = seq_lseek,
 180         .release        = nfsd_pool_stats_release,
 181         .owner          = THIS_MODULE,
 182 };
 183
 184 /*----------------------------------------------------------------------------*/
 185 /*
 186  * payload - write methods
 187  */
 188
 189 /**
 190  * write_svc - Start kernel's NFSD server
 191  *
 192  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 193  * Function remains to support old versions of nfs-utils.
 194  *
 195  * Input:
 196  *                      buf:    struct nfsctl_svc
 197  *                              svc_port:       port number of this
 198  *                                              server's listener
 199  *                              svc_nthreads:   number of threads to start
 200  *                      size:   size in bytes of passed in nfsctl_svc
 201  * Output:
 202  *      On success:     returns zero
 203  *      On error:       return code is negative errno value
 204  */
 205 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 206 {
 207         struct nfsctl_svc *data;
 208         int err;
 209         if (size < sizeof(*data))
 210                 return -EINVAL;
 211         data = (struct nfsctl_svc*) buf;
 212         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 213         if (err < 0)
 214                 return err;
 215         return 0;
 216 }
 217
 218 /**
 219  * write_add - Add or modify client entry in auth unix cache
 220  *
 221  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 222  * Function remains to support old versions of nfs-utils.
 223  *
 224  * Input:
 225  *                      buf:    struct nfsctl_client
 226  *                              cl_ident:       '\0'-terminated C string
 227  *                                              containing domain name
 228  *                                              of client
 229  *                              cl_naddr:       no. of items in cl_addrlist
 230  *                              cl_addrlist:    array of client addresses
 231  *                              cl_fhkeytype:   ignored
 232  *                              cl_fhkeylen:    ignored
 233  *                              cl_fhkey:       ignored
 234  *                      size:   size in bytes of passed in nfsctl_client
 235  * Output:
 236  *      On success:     returns zero
 237  *      On error:       return code is negative errno value
 238  *
 239  * Note: Only AF_INET client addresses are passed in, since
 240  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 241  */
 242 static ssize_t write_add(struct file *file, char *buf, size_t size)
 243 {
 244         struct nfsctl_client *data;
 245         if (size < sizeof(*data))
 246                 return -EINVAL;
 247         data = (struct nfsctl_client *)buf;
 248         return exp_addclient(data);
 249 }
 250
 251 /**
 252  * write_del - Remove client from auth unix cache
 253  *
 254  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 255  * Function remains to support old versions of nfs-utils.
 256  *
 257  * Input:
 258  *                      buf:    struct nfsctl_client
 259  *                              cl_ident:       '\0'-terminated C string
 260  *                                              containing domain name
 261  *                                              of client
 262  *                              cl_naddr:       ignored
 263  *                              cl_addrlist:    ignored
 264  *                              cl_fhkeytype:   ignored
 265  *                              cl_fhkeylen:    ignored
 266  *                              cl_fhkey:       ignored
 267  *                      size:   size in bytes of passed in nfsctl_client
 268  * Output:
 269  *      On success:     returns zero
 270  *      On error:       return code is negative errno value
 271  *
 272  * Note: Only AF_INET client addresses are passed in, since
 273  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 274  */
 275 static ssize_t write_del(struct file *file, char *buf, size_t size)
 276 {
 277         struct nfsctl_client *data;
 278         if (size < sizeof(*data))
 279                 return -EINVAL;
 280         data = (struct nfsctl_client *)buf;
 281         return exp_delclient(data);
 282 }
 283
 284 /**
 285  * write_export - Export part or all of a local file system
 286  *
 287  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 288  * Function remains to support old versions of nfs-utils.
 289  *
 290  * Input:
 291  *                      buf:    struct nfsctl_export
 292  *                              ex_client:      '\0'-terminated C string
 293  *                                              containing domain name
 294  *                                              of client allowed to access
 295  *                                              this export
 296  *                              ex_path:        '\0'-terminated C string
 297  *                                              containing pathname of
 298  *                                              directory in local file system
 299  *                              ex_dev:         fsid to use for this export
 300  *                              ex_ino:         ignored
 301  *                              ex_flags:       export flags for this export
 302  *                              ex_anon_uid:    UID to use for anonymous
 303  *                                              requests
 304  *                              ex_anon_gid:    GID to use for anonymous
 305  *                                              requests
 306  *                      size:   size in bytes of passed in nfsctl_export
 307  * Output:
 308  *      On success:     returns zero
 309  *      On error:       return code is negative errno value
 310  */
 311 static ssize_t write_export(struct file *file, char *buf, size_t size)
 312 {
 313         struct nfsctl_export *data;
 314         if (size < sizeof(*data))
 315                 return -EINVAL;
 316         data = (struct nfsctl_export*)buf;
 317         return exp_export(data);
 318 }
 319
 320 /**
 321  * write_unexport - Unexport a previously exported file system
 322  *
 323  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 324  * Function remains to support old versions of nfs-utils.
 325  *
 326  * Input:
 327  *                      buf:    struct nfsctl_export
 328  *                              ex_client:      '\0'-terminated C string
 329  *                                              containing domain name
 330  *                                              of client no longer allowed
 331  *                                              to access this export
 332  *                              ex_path:        '\0'-terminated C string
 333  *                                              containing pathname of
 334  *                                              directory in local file system
 335  *                              ex_dev:         ignored
 336  *                              ex_ino:         ignored
 337  *                              ex_flags:       ignored
 338  *                              ex_anon_uid:    ignored
 339  *                              ex_anon_gid:    ignored
 340  *                      size:   size in bytes of passed in nfsctl_export
 341  * Output:
 342  *      On success:     returns zero
 343  *      On error:       return code is negative errno value
 344  */
 345 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 346 {
 347         struct nfsctl_export *data;
 348
 349         if (size < sizeof(*data))
 350                 return -EINVAL;
 351         data = (struct nfsctl_export*)buf;
 352         return exp_unexport(data);
 353 }
 354
 355 /**
 356  * write_getfs - Get a variable-length NFS file handle by path
 357  *
 358  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 359  * Function remains to support old versions of nfs-utils.
 360  *
 361  * Input:
 362  *                      buf:    struct nfsctl_fsparm
 363  *                              gd_addr:        socket address of client
 364  *                              gd_path:        '\0'-terminated C string
 365  *                                              containing pathname of
 366  *                                              directory in local file system
 367  *                              gd_maxlen:      maximum size of returned file
 368  *                                              handle
 369  *                      size:   size in bytes of passed in nfsctl_fsparm
 370  * Output:
 371  *      On success:     passed-in buffer filled with a knfsd_fh structure
 372  *                      (a variable-length raw NFS file handle);
 373  *                      return code is the size in bytes of the file handle
 374  *      On error:       return code is negative errno value
 375  *
 376  * Note: Only AF_INET client addresses are passed in, since gd_addr
 377  * is the same size as a struct sockaddr_in.
 378  */
 379 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 380 {
 381         struct nfsctl_fsparm *data;
 382         struct sockaddr_in *sin;
 383         struct auth_domain *clp;
 384         int err = 0;
 385         struct knfsd_fh *res;
 386         struct in6_addr in6;
 387
 388         if (size < sizeof(*data))
 389                 return -EINVAL;
 390         data = (struct nfsctl_fsparm*)buf;
 391         err = -EPROTONOSUPPORT;
 392         if (data->gd_addr.sa_family != AF_INET)
 393                 goto out;
 394         sin = (struct sockaddr_in *)&data->gd_addr;
 395         if (data->gd_maxlen > NFS3_FHSIZE)
 396                 data->gd_maxlen = NFS3_FHSIZE;
 397
 398         res = (struct knfsd_fh*)buf;
 399
 400         exp_readlock();
 401
 402         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 403
 404         clp = auth_unix_lookup(&in6);
 405         if (!clp)
 406                 err = -EPERM;
 407         else {
 408                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 409                 auth_domain_put(clp);
 410         }
 411         exp_readunlock();
 412         if (err == 0)
 413                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 414  out:
 415         return err;
 416 }
 417
 418 /**
 419  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 420  *
 421  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 422  * Function remains to support old versions of nfs-utils.
 423  *
 424  * Input:
 425  *                      buf:    struct nfsctl_fdparm
 426  *                              gd_addr:        socket address of client
 427  *                              gd_path:        '\0'-terminated C string
 428  *                                              containing pathname of
 429  *                                              directory in local file system
 430  *                              gd_version:     fdparm structure version
 431  *                      size:   size in bytes of passed in nfsctl_fdparm
 432  * Output:
 433  *      On success:     passed-in buffer filled with nfsctl_res
 434  *                      (a fixed-length raw NFS file handle);
 435  *                      return code is the size in bytes of the file handle
 436  *      On error:       return code is negative errno value
 437  *
 438  * Note: Only AF_INET client addresses are passed in, since gd_addr
 439  * is the same size as a struct sockaddr_in.
 440  */
 441 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 442 {
 443         struct nfsctl_fdparm *data;
 444         struct sockaddr_in *sin;
 445         struct auth_domain *clp;
 446         int err = 0;
 447         struct knfsd_fh fh;
 448         char *res;
 449         struct in6_addr in6;
 450
 451         if (size < sizeof(*data))
 452                 return -EINVAL;
 453         data = (struct nfsctl_fdparm*)buf;
 454         err = -EPROTONOSUPPORT;
 455         if (data->gd_addr.sa_family != AF_INET)
 456                 goto out;
 457         err = -EINVAL;
 458         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 459                 goto out;
 460
 461         res = buf;
 462         sin = (struct sockaddr_in *)&data->gd_addr;
 463         exp_readlock();
 464
 465         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 466
 467         clp = auth_unix_lookup(&in6);
 468         if (!clp)
 469                 err = -EPERM;
 470         else {
 471                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 472                 auth_domain_put(clp);
 473         }
 474         exp_readunlock();
 475
 476         if (err == 0) {
 477                 memset(res,0, NFS_FHSIZE);
 478                 memcpy(res, &fh.fh_base, fh.fh_size);
 479                 err = NFS_FHSIZE;
 480         }
 481  out:
 482         return err;
 483 }
 484
 485 /**
 486  * write_unlock_ip - Release all locks used by a client
 487  *
 488  * Experimental.
 489  *
 490  * Input:
 491  *                      buf:    '\n'-terminated C string containing a
 492  *                              presentation format IP address
 493  *                      size:   length of C string in @buf
 494  * Output:
 495  *      On success:     returns zero if all specified locks were released;
 496  *                      returns one if one or more locks were not released
 497  *      On error:       return code is negative errno value
 498  */
 499 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 500 {
 501         struct sockaddr_storage address;
 502         struct sockaddr *sap = (struct sockaddr *)&address;
 503         size_t salen = sizeof(address);
 504         char *fo_path;
 505
 506         /* sanity check */
 507         if (size == 0)
 508                 return -EINVAL;
 509
 510         if (buf[size-1] != '\n')
 511                 return -EINVAL;
 512
 513         fo_path = buf;
 514         if (qword_get(&buf, fo_path, size) < 0)
 515                 return -EINVAL;
 516
 517         if (rpc_pton(fo_path, size, sap, salen) == 0)
 518                 return -EINVAL;
 519
 520         return nlmsvc_unlock_all_by_ip(sap);
 521 }
 522
 523 /**
 524  * write_unlock_fs - Release all locks on a local file system
 525  *
 526  * Experimental.
 527  *
 528  * Input:
 529  *                      buf:    '\n'-terminated C string containing the
 530  *                              absolute pathname of a local file system
 531  *                      size:   length of C string in @buf
 532  * Output:
 533  *      On success:     returns zero if all specified locks were released;
 534  *                      returns one if one or more locks were not released
 535  *      On error:       return code is negative errno value
 536  */
 537 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 538 {
 539         struct path path;
 540         char *fo_path;
 541         int error;
 542
 543         /* sanity check */
 544         if (size == 0)
 545                 return -EINVAL;
 546
 547         if (buf[size-1] != '\n')
 548                 return -EINVAL;
 549
 550         fo_path = buf;
 551         if (qword_get(&buf, fo_path, size) < 0)
 552                 return -EINVAL;
 553
 554         error = kern_path(fo_path, 0, &path);
 555         if (error)
 556                 return error;
 557
 558         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 559
 560         path_put(&path);
 561         return error;
 562 }
 563
 564 /**
 565  * write_filehandle - Get a variable-length NFS file handle by path
 566  *
 567  * On input, the buffer contains a '\n'-terminated C string comprised of
 568  * three alphanumeric words separated by whitespace.  The string may
 569  * contain escape sequences.
 570  *
 571  * Input:
 572  *                      buf:
 573  *                              domain:         client domain name
 574  *                              path:           export pathname
 575  *                              maxsize:        numeric maximum size of
 576  *                                              @buf
 577  *                      size:   length of C string in @buf
 578  * Output:
 579  *      On success:     passed-in buffer filled with '\n'-terminated C
 580  *                      string containing a ASCII hex text version
 581  *                      of the NFS file handle;
 582  *                      return code is the size in bytes of the string
 583  *      On error:       return code is negative errno value
 584  */
 585 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 586 {
 587         char *dname, *path;
 588         int uninitialized_var(maxsize);
 589         char *mesg = buf;
 590         int len;
 591         struct auth_domain *dom;
 592         struct knfsd_fh fh;
 593
 594         if (size == 0)
 595                 return -EINVAL;
 596
 597         if (buf[size-1] != '\n')
 598                 return -EINVAL;
 599         buf[size-1] = 0;
 600
 601         dname = mesg;
 602         len = qword_get(&mesg, dname, size);
 603         if (len <= 0)
 604                 return -EINVAL;
 605
 606         path = dname+len+1;
 607         len = qword_get(&mesg, path, size);
 608         if (len <= 0)
 609                 return -EINVAL;
 610
 611         len = get_int(&mesg, &maxsize);
 612         if (len)
 613                 return len;
 614
 615         if (maxsize < NFS_FHSIZE)
 616                 return -EINVAL;
 617         if (maxsize > NFS3_FHSIZE)
 618                 maxsize = NFS3_FHSIZE;
 619
 620         if (qword_get(&mesg, mesg, size)>0)
 621                 return -EINVAL;
 622
 623         /* we have all the words, they are in buf.. */
 624         dom = unix_domain_find(dname);
 625         if (!dom)
 626                 return -ENOMEM;
 627
 628         len = exp_rootfh(dom, path, &fh,  maxsize);
 629         auth_domain_put(dom);
 630         if (len)
 631                 return len;
 632
 633         mesg = buf;
 634         len = SIMPLE_TRANSACTION_LIMIT;
 635         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 636         mesg[-1] = '\n';
 637         return mesg - buf;
 638 }
 639
 640 /**
 641  * write_threads - Start NFSD, or report the current number of running threads
 642  *
 643  * Input:
 644  *                      buf:            ignored
 645  *                      size:           zero
 646  * Output:
 647  *      On success:     passed-in buffer filled with '\n'-terminated C
 648  *                      string numeric value representing the number of
 649  *                      running NFSD threads;
 650  *                      return code is the size in bytes of the string
 651  *      On error:       return code is zero
 652  *
 653  * OR
 654  *
 655  * Input:
 656  *                      buf:            C string containing an unsigned
 657  *                                      integer value representing the
 658  *                                      number of NFSD threads to start
 659  *                      size:           non-zero length of C string in @buf
 660  * Output:
 661  *      On success:     NFS service is started;
 662  *                      passed-in buffer filled with '\n'-terminated C
 663  *                      string numeric value representing the number of
 664  *                      running NFSD threads;
 665  *                      return code is the size in bytes of the string
 666  *      On error:       return code is zero or a negative errno value
 667  */
 668 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 669 {
 670         char *mesg = buf;
 671         int rv;
 672         if (size > 0) {
 673                 int newthreads;
 674                 rv = get_int(&mesg, &newthreads);
 675                 if (rv)
 676                         return rv;
 677                 if (newthreads < 0)
 678                         return -EINVAL;
 679                 rv = nfsd_svc(NFS_PORT, newthreads);
 680                 if (rv < 0)
 681                         return rv;
 682         } else
 683                 rv = nfsd_nrthreads();
 684
 685         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 686 }
 687
 688 /**
 689  * write_pool_threads - Set or report the current number of threads per pool
 690  *
 691  * Input:
 692  *                      buf:            ignored
 693  *                      size:           zero
 694  *
 695  * OR
 696  *
 697  * Input:
 698  *                      buf:            C string containing whitespace-
 699  *                                      separated unsigned integer values
 700  *                                      representing the number of NFSD
 701  *                                      threads to start in each pool
 702  *                      size:           non-zero length of C string in @buf
 703  * Output:
 704  *      On success:     passed-in buffer filled with '\n'-terminated C
 705  *                      string containing integer values representing the
 706  *                      number of NFSD threads in each pool;
 707  *                      return code is the size in bytes of the string
 708  *      On error:       return code is zero or a negative errno value
 709  */
 710 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 711 {
 712         /* if size > 0, look for an array of number of threads per node
 713          * and apply them  then write out number of threads per node as reply
 714          */
 715         char *mesg = buf;
 716         int i;
 717         int rv;
 718         int len;
 719         int npools;
 720         int *nthreads;
 721
 722         mutex_lock(&nfsd_mutex);
 723         npools = nfsd_nrpools();
 724         if (npools == 0) {
 725                 /*
 726                  * NFS is shut down.  The admin can start it by
 727                  * writing to the threads file but NOT the pool_threads
 728                  * file, sorry.  Report zero threads.
 729                  */
 730                 mutex_unlock(&nfsd_mutex);
 731                 strcpy(buf, "0\n");
 732                 return strlen(buf);
 733         }
 734
 735         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 736         rv = -ENOMEM;
 737         if (nthreads == NULL)
 738                 goto out_free;
 739
 740         if (size > 0) {
 741                 for (i = 0; i < npools; i++) {
 742                         rv = get_int(&mesg, &nthreads[i]);
 743                         if (rv == -ENOENT)
 744                                 break;          /* fewer numbers than pools */
 745                         if (rv)
 746                                 goto out_free;  /* syntax error */
 747                         rv = -EINVAL;
 748                         if (nthreads[i] < 0)
 749                                 goto out_free;
 750                 }
 751                 rv = nfsd_set_nrthreads(i, nthreads);
 752                 if (rv)
 753                         goto out_free;
 754         }
 755
 756         rv = nfsd_get_nrthreads(npools, nthreads);
 757         if (rv)
 758                 goto out_free;
 759
 760         mesg = buf;
 761         size = SIMPLE_TRANSACTION_LIMIT;
 762         for (i = 0; i < npools && size > 0; i++) {
 763                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 764                 len = strlen(mesg);
 765                 size -= len;
 766                 mesg += len;
 767         }
 768         rv = mesg - buf;
 769 out_free:
 770         kfree(nthreads);
 771         mutex_unlock(&nfsd_mutex);
 772         return rv;
 773 }
 774
 775 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 776 {
 777         char *mesg = buf;
 778         char *vers, *minorp, sign;
 779         int len, num, remaining;
 780         unsigned minor;
 781         ssize_t tlen = 0;
 782         char *sep;
 783
 784         if (size>0) {
 785                 if (nfsd_serv)
 786                         /* Cannot change versions without updating
 787                          * nfsd_serv->sv_xdrsize, and reallocing
 788                          * rq_argp and rq_resp
 789                          */
 790                         return -EBUSY;
 791                 if (buf[size-1] != '\n')
 792                         return -EINVAL;
 793                 buf[size-1] = 0;
 794
 795                 vers = mesg;
 796                 len = qword_get(&mesg, vers, size);
 797                 if (len <= 0) return -EINVAL;
 798                 do {
 799                         sign = *vers;
 800                         if (sign == '+' || sign == '-')
 801                                 num = simple_strtol((vers+1), &minorp, 0);
 802                         else
 803                                 num = simple_strtol(vers, &minorp, 0);
 804                         if (*minorp == '.') {
 805                                 if (num < 4)
 806                                         return -EINVAL;
 807                                 minor = simple_strtoul(minorp+1, NULL, 0);
 808                                 if (minor == 0)
 809                                         return -EINVAL;
 810                                 if (nfsd_minorversion(minor, sign == '-' ?
 811                                                      NFSD_CLEAR : NFSD_SET) < 0)
 812                                         return -EINVAL;
 813                                 goto next;
 814                         }
 815                         switch(num) {
 816                         case 2:
 817                         case 3:
 818                         case 4:
 819                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 820                                 break;
 821                         default:
 822                                 return -EINVAL;
 823                         }
 824                 next:
 825                         vers += len + 1;
 826                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 827                 /* If all get turned off, turn them back on, as
 828                  * having no versions is BAD
 829                  */
 830                 nfsd_reset_versions();
 831         }
 832
 833         /* Now write current state into reply buffer */
 834         len = 0;
 835         sep = "";
 836         remaining = SIMPLE_TRANSACTION_LIMIT;
 837         for (num=2 ; num <= 4 ; num++)
 838                 if (nfsd_vers(num, NFSD_AVAIL)) {
 839                         len = snprintf(buf, remaining, "%s%c%d", sep,
 840                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 841                                        num);
 842                         sep = " ";
 843
 844                         if (len > remaining)
 845                                 break;
 846                         remaining -= len;
 847                         buf += len;
 848                         tlen += len;
 849                 }
 850         if (nfsd_vers(4, NFSD_AVAIL))
 851                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 852                      minor++) {
 853                         len = snprintf(buf, remaining, " %c4.%u",
 854                                         (nfsd_vers(4, NFSD_TEST) &&
 855                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 856                                                 '+' : '-',
 857                                         minor);
 858
 859                         if (len > remaining)
 860                                 break;
 861                         remaining -= len;
 862                         buf += len;
 863                         tlen += len;
 864                 }
 865
 866         len = snprintf(buf, remaining, "\n");
 867         if (len > remaining)
 868                 return -EINVAL;
 869         return tlen + len;
 870 }
 871
 872 /**
 873  * write_versions - Set or report the available NFS protocol versions
 874  *
 875  * Input:
 876  *                      buf:            ignored
 877  *                      size:           zero
 878  * Output:
 879  *      On success:     passed-in buffer filled with '\n'-terminated C
 880  *                      string containing positive or negative integer
 881  *                      values representing the current status of each
 882  *                      protocol version;
 883  *                      return code is the size in bytes of the string
 884  *      On error:       return code is zero or a negative errno value
 885  *
 886  * OR
 887  *
 888  * Input:
 889  *                      buf:            C string containing whitespace-
 890  *                                      separated positive or negative
 891  *                                      integer values representing NFS
 892  *                                      protocol versions to enable ("+n")
 893  *                                      or disable ("-n")
 894  *                      size:           non-zero length of C string in @buf
 895  * Output:
 896  *      On success:     status of zero or more protocol versions has
 897  *                      been updated; passed-in buffer filled with
 898  *                      '\n'-terminated C string containing positive
 899  *                      or negative integer values representing the
 900  *                      current status of each protocol version;
 901  *                      return code is the size in bytes of the string
 902  *      On error:       return code is zero or a negative errno value
 903  */
 904 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 905 {
 906         ssize_t rv;
 907
 908         mutex_lock(&nfsd_mutex);
 909         rv = __write_versions(file, buf, size);
 910         mutex_unlock(&nfsd_mutex);
 911         return rv;
 912 }
 913
 914 /*
 915  * Zero-length write.  Return a list of NFSD's current listener
 916  * transports.
 917  */
 918 static ssize_t __write_ports_names(char *buf)
 919 {
 920         if (nfsd_serv == NULL)
 921                 return 0;
 922         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 923 }
 924
 925 /*
 926  * A single 'fd' number was written, in which case it must be for
 927  * a socket of a supported family/protocol, and we use it as an
 928  * nfsd listener.
 929  */
 930 static ssize_t __write_ports_addfd(char *buf)
 931 {
 932         char *mesg = buf;
 933         int fd, err;
 934
 935         err = get_int(&mesg, &fd);
 936         if (err != 0 || fd < 0)
 937                 return -EINVAL;
 938
 939         err = nfsd_create_serv();
 940         if (err != 0)
 941                 return err;
 942
 943         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 944         if (err < 0) {
 945                 svc_destroy(nfsd_serv);
 946                 return err;
 947         }
 948
 949         /* Decrease the count, but don't shut down the service */
 950         nfsd_serv->sv_nrthreads--;
 951         return err;
 952 }
 953
 954 /*
 955  * A '-' followed by the 'name' of a socket means we close the socket.
 956  */
 957 static ssize_t __write_ports_delfd(char *buf)
 958 {
 959         char *toclose;
 960         int len = 0;
 961
 962         toclose = kstrdup(buf + 1, GFP_KERNEL);
 963         if (toclose == NULL)
 964                 return -ENOMEM;
 965
 966         if (nfsd_serv != NULL)
 967                 len = svc_sock_names(nfsd_serv, buf,
 968                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 969         kfree(toclose);
 970         return len;
 971 }
 972
 973 /*
 974  * A transport listener is added by writing it's transport name and
 975  * a port number.
 976  */
 977 static ssize_t __write_ports_addxprt(char *buf)
 978 {
 979         char transport[16];
 980         struct svc_xprt *xprt;
 981         int port, err;
 982
 983         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 984                 return -EINVAL;
 985
 986         if (port < 1 || port > USHRT_MAX)
 987                 return -EINVAL;
 988
 989         err = nfsd_create_serv();
 990         if (err != 0)
 991                 return err;
 992
 993         err = svc_create_xprt(nfsd_serv, transport,
 994                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 995         if (err < 0)
 996                 goto out_err;
 997
 998         err = svc_create_xprt(nfsd_serv, transport,
 999                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1000         if (err < 0 && err != -EAFNOSUPPORT)
1001                 goto out_close;
1002
1003         /* Decrease the count, but don't shut down the service */
1004         nfsd_serv->sv_nrthreads--;
1005         return 0;
1006 out_close:
1007         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1008         if (xprt != NULL) {
1009                 svc_close_xprt(xprt);
1010                 svc_xprt_put(xprt);
1011         }
1012 out_err:
1013         svc_destroy(nfsd_serv);
1014         return err;
1015 }
1016
1017 /*
1018  * A transport listener is removed by writing a "-", it's transport
1019  * name, and it's port number.
1020  */
1021 static ssize_t __write_ports_delxprt(char *buf)
1022 {
1023         struct svc_xprt *xprt;
1024         char transport[16];
1025         int port;
1026
1027         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1028                 return -EINVAL;
1029
1030         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1031                 return -EINVAL;
1032
1033         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1034         if (xprt == NULL)
1035                 return -ENOTCONN;
1036
1037         svc_close_xprt(xprt);
1038         svc_xprt_put(xprt);
1039         return 0;
1040 }
1041
1042 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1043 {
1044         if (size == 0)
1045                 return __write_ports_names(buf);
1046
1047         if (isdigit(buf[0]))
1048                 return __write_ports_addfd(buf);
1049
1050         if (buf[0] == '-' && isdigit(buf[1]))
1051                 return __write_ports_delfd(buf);
1052
1053         if (isalpha(buf[0]))
1054                 return __write_ports_addxprt(buf);
1055
1056         if (buf[0] == '-' && isalpha(buf[1]))
1057                 return __write_ports_delxprt(buf);
1058
1059         return -EINVAL;
1060 }
1061
1062 /**
1063  * write_ports - Pass a socket file descriptor or transport name to listen on
1064  *
1065  * Input:
1066  *                      buf:            ignored
1067  *                      size:           zero
1068  * Output:
1069  *      On success:     passed-in buffer filled with a '\n'-terminated C
1070  *                      string containing a whitespace-separated list of
1071  *                      named NFSD listeners;
1072  *                      return code is the size in bytes of the string
1073  *      On error:       return code is zero or a negative errno value
1074  *
1075  * OR
1076  *
1077  * Input:
1078  *                      buf:            C string containing an unsigned
1079  *                                      integer value representing a bound
1080  *                                      but unconnected socket that is to be
1081  *                                      used as an NFSD listener; listen(3)
1082  *                                      must be called for a SOCK_STREAM
1083  *                                      socket, otherwise it is ignored
1084  *                      size:           non-zero length of C string in @buf
1085  * Output:
1086  *      On success:     NFS service is started;
1087  *                      passed-in buffer filled with a '\n'-terminated C
1088  *                      string containing a unique alphanumeric name of
1089  *                      the listener;
1090  *                      return code is the size in bytes of the string
1091  *      On error:       return code is a negative errno value
1092  *
1093  * OR
1094  *
1095  * Input:
1096  *                      buf:            C string containing a "-" followed
1097  *                                      by an integer value representing a
1098  *                                      previously passed in socket file
1099  *                                      descriptor
1100  *                      size:           non-zero length of C string in @buf
1101  * Output:
1102  *      On success:     NFS service no longer listens on that socket;
1103  *                      passed-in buffer filled with a '\n'-terminated C
1104  *                      string containing a unique name of the listener;
1105  *                      return code is the size in bytes of the string
1106  *      On error:       return code is a negative errno value
1107  *
1108  * OR
1109  *
1110  * Input:
1111  *                      buf:            C string containing a transport
1112  *                                      name and an unsigned integer value
1113  *                                      representing the port to listen on,
1114  *                                      separated by whitespace
1115  *                      size:           non-zero length of C string in @buf
1116  * Output:
1117  *      On success:     returns zero; NFS service is started
1118  *      On error:       return code is a negative errno value
1119  *
1120  * OR
1121  *
1122  * Input:
1123  *                      buf:            C string containing a "-" followed
1124  *                                      by a transport name and an unsigned
1125  *                                      integer value representing the port
1126  *                                      to listen on, separated by whitespace
1127  *                      size:           non-zero length of C string in @buf
1128  * Output:
1129  *      On success:     returns zero; NFS service no longer listens
1130  *                      on that transport
1131  *      On error:       return code is a negative errno value
1132  */
1133 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1134 {
1135         ssize_t rv;
1136
1137         mutex_lock(&nfsd_mutex);
1138         rv = __write_ports(file, buf, size);
1139         mutex_unlock(&nfsd_mutex);
1140         return rv;
1141 }
1142
1143
1144 int nfsd_max_blksize;
1145
1146 /**
1147  * write_maxblksize - Set or report the current NFS blksize
1148  *
1149  * Input:
1150  *                      buf:            ignored
1151  *                      size:           zero
1152  *
1153  * OR
1154  *
1155  * Input:
1156  *                      buf:            C string containing an unsigned
1157  *                                      integer value representing the new
1158  *                                      NFS blksize
1159  *                      size:           non-zero length of C string in @buf
1160  * Output:
1161  *      On success:     passed-in buffer filled with '\n'-terminated C string
1162  *                      containing numeric value of the current NFS blksize
1163  *                      setting;
1164  *                      return code is the size in bytes of the string
1165  *      On error:       return code is zero or a negative errno value
1166  */
1167 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1168 {
1169         char *mesg = buf;
1170         if (size > 0) {
1171                 int bsize;
1172                 int rv = get_int(&mesg, &bsize);
1173                 if (rv)
1174                         return rv;
1175                 /* force bsize into allowed range and
1176                  * required alignment.
1177                  */
1178                 if (bsize < 1024)
1179                         bsize = 1024;
1180                 if (bsize > NFSSVC_MAXBLKSIZE)
1181                         bsize = NFSSVC_MAXBLKSIZE;
1182                 bsize &= ~(1024-1);
1183                 mutex_lock(&nfsd_mutex);
1184                 if (nfsd_serv) {
1185                         mutex_unlock(&nfsd_mutex);
1186                         return -EBUSY;
1187                 }
1188                 nfsd_max_blksize = bsize;
1189                 mutex_unlock(&nfsd_mutex);
1190         }
1191
1192         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1193                                                         nfsd_max_blksize);
1194 }
1195
1196 #ifdef CONFIG_NFSD_V4
1197 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1198 {
1199         char *mesg = buf;
1200         int rv, i;
1201
1202         if (size > 0) {
1203                 if (nfsd_serv)
1204                         return -EBUSY;
1205                 rv = get_int(&mesg, &i);
1206                 if (rv)
1207                         return rv;
1208                 /*
1209                  * Some sanity checking.  We don't have a reason for
1210                  * these particular numbers, but problems with the
1211                  * extremes are:
1212                  *      - Too short: the briefest network outage may
1213                  *        cause clients to lose all their locks.  Also,
1214                  *        the frequent polling may be wasteful.
1215                  *      - Too long: do you really want reboot recovery
1216                  *        to take more than an hour?  Or to make other
1217                  *        clients wait an hour before being able to
1218                  *        revoke a dead client's locks?
1219                  */
1220                 if (i < 10 || i > 3600)
1221                         return -EINVAL;
1222                 *time = i;
1223         }
1224
1225         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1226 }
1227
1228 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1229 {
1230         ssize_t rv;
1231
1232         mutex_lock(&nfsd_mutex);
1233         rv = __nfsd4_write_time(file, buf, size, time);
1234         mutex_unlock(&nfsd_mutex);
1235         return rv;
1236 }
1237
1238 /**
1239  * write_leasetime - Set or report the current NFSv4 lease time
1240  *
1241  * Input:
1242  *                      buf:            ignored
1243  *                      size:           zero
1244  *
1245  * OR
1246  *
1247  * Input:
1248  *                      buf:            C string containing an unsigned
1249  *                                      integer value representing the new
1250  *                                      NFSv4 lease expiry time
1251  *                      size:           non-zero length of C string in @buf
1252  * Output:
1253  *      On success:     passed-in buffer filled with '\n'-terminated C
1254  *                      string containing unsigned integer value of the
1255  *                      current lease expiry time;
1256  *                      return code is the size in bytes of the string
1257  *      On error:       return code is zero or a negative errno value
1258  */
1259 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1260 {
1261         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1262 }
1263
1264 /**
1265  * write_gracetime - Set or report current NFSv4 grace period time
1266  *
1267  * As above, but sets the time of the NFSv4 grace period.
1268  *
1269  * Note this should never be set to less than the *previous*
1270  * lease-period time, but we don't try to enforce this.  (In the common
1271  * case (a new boot), we don't know what the previous lease time was
1272  * anyway.)
1273  */
1274 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1275 {
1276         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1277 }
1278
1279 extern char *nfs4_recoverydir(void);
1280
1281 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1282 {
1283         char *mesg = buf;
1284         char *recdir;
1285         int len, status;
1286
1287         if (size > 0) {
1288                 if (nfsd_serv)
1289                         return -EBUSY;
1290                 if (size > PATH_MAX || buf[size-1] != '\n')
1291                         return -EINVAL;
1292                 buf[size-1] = 0;
1293
1294                 recdir = mesg;
1295                 len = qword_get(&mesg, recdir, size);
1296                 if (len <= 0)
1297                         return -EINVAL;
1298
1299                 status = nfs4_reset_recoverydir(recdir);
1300                 if (status)
1301                         return status;
1302         }
1303
1304         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1305                                                         nfs4_recoverydir());
1306 }
1307
1308 /**
1309  * write_recoverydir - Set or report the pathname of the recovery directory
1310  *
1311  * Input:
1312  *                      buf:            ignored
1313  *                      size:           zero
1314  *
1315  * OR
1316  *
1317  * Input:
1318  *                      buf:            C string containing the pathname
1319  *                                      of the directory on a local file
1320  *                                      system containing permanent NFSv4
1321  *                                      recovery data
1322  *                      size:           non-zero length of C string in @buf
1323  * Output:
1324  *      On success:     passed-in buffer filled with '\n'-terminated C string
1325  *                      containing the current recovery pathname setting;
1326  *                      return code is the size in bytes of the string
1327  *      On error:       return code is zero or a negative errno value
1328  */
1329 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1330 {
1331         ssize_t rv;
1332
1333         mutex_lock(&nfsd_mutex);
1334         rv = __write_recoverydir(file, buf, size);
1335         mutex_unlock(&nfsd_mutex);
1336         return rv;
1337 }
1338
1339 #endif
1340
1341 /*----------------------------------------------------------------------------*/
1342 /*
1343  *      populating the filesystem.
1344  */
1345
1346 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1347 {
1348         static struct tree_descr nfsd_files[] = {
1349                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1350                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1351                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1352                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1353                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1354                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1355                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1356                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1357                 [NFSD_Export_features] = {"export_features",
1358                                         &export_features_operations, S_IRUGO},
1359                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1360                                         &transaction_ops, S_IWUSR|S_IRUSR},
1361                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1362                                         &transaction_ops, S_IWUSR|S_IRUSR},
1363                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1364                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1365                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1366                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1367                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1368                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1369                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1370 #ifdef CONFIG_NFSD_V4
1371                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1372                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1373                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1374 #endif
1375                 /* last one */ {""}
1376         };
1377         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1378 }
1379
1380 static int nfsd_get_sb(struct file_system_type *fs_type,
1381         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1382 {
1383         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1384 }
1385
1386 static struct file_system_type nfsd_fs_type = {
1387         .owner          = THIS_MODULE,
1388         .name           = "nfsd",
1389         .get_sb         = nfsd_get_sb,
1390         .kill_sb        = kill_litter_super,
1391 };
1392
1393 #ifdef CONFIG_PROC_FS
1394 static int create_proc_exports_entry(void)
1395 {
1396         struct proc_dir_entry *entry;
1397
1398         entry = proc_mkdir("fs/nfs", NULL);
1399         if (!entry)
1400                 return -ENOMEM;
1401         entry = proc_create("exports", 0, entry, &exports_operations);
1402         if (!entry)
1403                 return -ENOMEM;
1404         return 0;
1405 }
1406 #else /* CONFIG_PROC_FS */
1407 static int create_proc_exports_entry(void)
1408 {
1409         return 0;
1410 }
1411 #endif
1412
1413 static int __init init_nfsd(void)
1414 {
1415         int retval;
1416         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1417
1418         retval = nfs4_state_init(); /* nfs4 locking state */
1419         if (retval)
1420                 return retval;
1421         nfsd_stat_init();       /* Statistics */
1422         retval = nfsd_reply_cache_init();
1423         if (retval)
1424                 goto out_free_stat;
1425         retval = nfsd_export_init();
1426         if (retval)
1427                 goto out_free_cache;
1428         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1429         retval = nfsd_idmap_init();
1430         if (retval)
1431                 goto out_free_lockd;
1432         retval = create_proc_exports_entry();
1433         if (retval)
1434                 goto out_free_idmap;
1435         retval = register_filesystem(&nfsd_fs_type);
1436         if (retval)
1437                 goto out_free_all;
1438         return 0;
1439 out_free_all:
1440         remove_proc_entry("fs/nfs/exports", NULL);
1441         remove_proc_entry("fs/nfs", NULL);
1442 out_free_idmap:
1443         nfsd_idmap_shutdown();
1444 out_free_lockd:
1445         nfsd_lockd_shutdown();
1446         nfsd_export_shutdown();
1447 out_free_cache:
1448         nfsd_reply_cache_shutdown();
1449 out_free_stat:
1450         nfsd_stat_shutdown();
1451         nfsd4_free_slabs();
1452         return retval;
1453 }
1454
1455 static void __exit exit_nfsd(void)
1456 {
1457         nfsd_export_shutdown();
1458         nfsd_reply_cache_shutdown();
1459         remove_proc_entry("fs/nfs/exports", NULL);
1460         remove_proc_entry("fs/nfs", NULL);
1461         nfsd_stat_shutdown();
1462         nfsd_lockd_shutdown();
1463         nfsd_idmap_shutdown();
1464         nfsd4_free_slabs();
1465         unregister_filesystem(&nfsd_fs_type);
1466 }
1467
1468 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1469 MODULE_LICENSE("GPL");
1470 module_init(init_nfsd)
1471 module_exit(exit_nfsd)