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         /*
 559          * XXX: Needs better sanity checking.  Otherwise we could end up
 560          * releasing locks on the wrong file system.
 561          *
 562          * For example:
 563          * 1.  Does the path refer to a directory?
 564          * 2.  Is that directory a mount point, or
 565          * 3.  Is that directory the root of an exported file system?
 566          */
 567         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 568
 569         path_put(&path);
 570         return error;
 571 }
 572
 573 /**
 574  * write_filehandle - Get a variable-length NFS file handle by path
 575  *
 576  * On input, the buffer contains a '\n'-terminated C string comprised of
 577  * three alphanumeric words separated by whitespace.  The string may
 578  * contain escape sequences.
 579  *
 580  * Input:
 581  *                      buf:
 582  *                              domain:         client domain name
 583  *                              path:           export pathname
 584  *                              maxsize:        numeric maximum size of
 585  *                                              @buf
 586  *                      size:   length of C string in @buf
 587  * Output:
 588  *      On success:     passed-in buffer filled with '\n'-terminated C
 589  *                      string containing a ASCII hex text version
 590  *                      of the NFS file handle;
 591  *                      return code is the size in bytes of the string
 592  *      On error:       return code is negative errno value
 593  */
 594 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 595 {
 596         char *dname, *path;
 597         int uninitialized_var(maxsize);
 598         char *mesg = buf;
 599         int len;
 600         struct auth_domain *dom;
 601         struct knfsd_fh fh;
 602
 603         if (size == 0)
 604                 return -EINVAL;
 605
 606         if (buf[size-1] != '\n')
 607                 return -EINVAL;
 608         buf[size-1] = 0;
 609
 610         dname = mesg;
 611         len = qword_get(&mesg, dname, size);
 612         if (len <= 0)
 613                 return -EINVAL;
 614
 615         path = dname+len+1;
 616         len = qword_get(&mesg, path, size);
 617         if (len <= 0)
 618                 return -EINVAL;
 619
 620         len = get_int(&mesg, &maxsize);
 621         if (len)
 622                 return len;
 623
 624         if (maxsize < NFS_FHSIZE)
 625                 return -EINVAL;
 626         if (maxsize > NFS3_FHSIZE)
 627                 maxsize = NFS3_FHSIZE;
 628
 629         if (qword_get(&mesg, mesg, size)>0)
 630                 return -EINVAL;
 631
 632         /* we have all the words, they are in buf.. */
 633         dom = unix_domain_find(dname);
 634         if (!dom)
 635                 return -ENOMEM;
 636
 637         len = exp_rootfh(dom, path, &fh,  maxsize);
 638         auth_domain_put(dom);
 639         if (len)
 640                 return len;
 641
 642         mesg = buf;
 643         len = SIMPLE_TRANSACTION_LIMIT;
 644         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 645         mesg[-1] = '\n';
 646         return mesg - buf;
 647 }
 648
 649 /**
 650  * write_threads - Start NFSD, or report the current number of running threads
 651  *
 652  * Input:
 653  *                      buf:            ignored
 654  *                      size:           zero
 655  * Output:
 656  *      On success:     passed-in buffer filled with '\n'-terminated C
 657  *                      string numeric value representing the number of
 658  *                      running NFSD threads;
 659  *                      return code is the size in bytes of the string
 660  *      On error:       return code is zero
 661  *
 662  * OR
 663  *
 664  * Input:
 665  *                      buf:            C string containing an unsigned
 666  *                                      integer value representing the
 667  *                                      number of NFSD threads to start
 668  *                      size:           non-zero length of C string in @buf
 669  * Output:
 670  *      On success:     NFS service is started;
 671  *                      passed-in buffer filled with '\n'-terminated C
 672  *                      string numeric value representing the number of
 673  *                      running NFSD threads;
 674  *                      return code is the size in bytes of the string
 675  *      On error:       return code is zero or a negative errno value
 676  */
 677 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 678 {
 679         char *mesg = buf;
 680         int rv;
 681         if (size > 0) {
 682                 int newthreads;
 683                 rv = get_int(&mesg, &newthreads);
 684                 if (rv)
 685                         return rv;
 686                 if (newthreads < 0)
 687                         return -EINVAL;
 688                 rv = nfsd_svc(NFS_PORT, newthreads);
 689                 if (rv < 0)
 690                         return rv;
 691         } else
 692                 rv = nfsd_nrthreads();
 693
 694         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 695 }
 696
 697 /**
 698  * write_pool_threads - Set or report the current number of threads per pool
 699  *
 700  * Input:
 701  *                      buf:            ignored
 702  *                      size:           zero
 703  *
 704  * OR
 705  *
 706  * Input:
 707  *                      buf:            C string containing whitespace-
 708  *                                      separated unsigned integer values
 709  *                                      representing the number of NFSD
 710  *                                      threads to start in each pool
 711  *                      size:           non-zero length of C string in @buf
 712  * Output:
 713  *      On success:     passed-in buffer filled with '\n'-terminated C
 714  *                      string containing integer values representing the
 715  *                      number of NFSD threads in each pool;
 716  *                      return code is the size in bytes of the string
 717  *      On error:       return code is zero or a negative errno value
 718  */
 719 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 720 {
 721         /* if size > 0, look for an array of number of threads per node
 722          * and apply them  then write out number of threads per node as reply
 723          */
 724         char *mesg = buf;
 725         int i;
 726         int rv;
 727         int len;
 728         int npools;
 729         int *nthreads;
 730
 731         mutex_lock(&nfsd_mutex);
 732         npools = nfsd_nrpools();
 733         if (npools == 0) {
 734                 /*
 735                  * NFS is shut down.  The admin can start it by
 736                  * writing to the threads file but NOT the pool_threads
 737                  * file, sorry.  Report zero threads.
 738                  */
 739                 mutex_unlock(&nfsd_mutex);
 740                 strcpy(buf, "0\n");
 741                 return strlen(buf);
 742         }
 743
 744         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 745         rv = -ENOMEM;
 746         if (nthreads == NULL)
 747                 goto out_free;
 748
 749         if (size > 0) {
 750                 for (i = 0; i < npools; i++) {
 751                         rv = get_int(&mesg, &nthreads[i]);
 752                         if (rv == -ENOENT)
 753                                 break;          /* fewer numbers than pools */
 754                         if (rv)
 755                                 goto out_free;  /* syntax error */
 756                         rv = -EINVAL;
 757                         if (nthreads[i] < 0)
 758                                 goto out_free;
 759                 }
 760                 rv = nfsd_set_nrthreads(i, nthreads);
 761                 if (rv)
 762                         goto out_free;
 763         }
 764
 765         rv = nfsd_get_nrthreads(npools, nthreads);
 766         if (rv)
 767                 goto out_free;
 768
 769         mesg = buf;
 770         size = SIMPLE_TRANSACTION_LIMIT;
 771         for (i = 0; i < npools && size > 0; i++) {
 772                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 773                 len = strlen(mesg);
 774                 size -= len;
 775                 mesg += len;
 776         }
 777         rv = mesg - buf;
 778 out_free:
 779         kfree(nthreads);
 780         mutex_unlock(&nfsd_mutex);
 781         return rv;
 782 }
 783
 784 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 785 {
 786         char *mesg = buf;
 787         char *vers, *minorp, sign;
 788         int len, num, remaining;
 789         unsigned minor;
 790         ssize_t tlen = 0;
 791         char *sep;
 792
 793         if (size>0) {
 794                 if (nfsd_serv)
 795                         /* Cannot change versions without updating
 796                          * nfsd_serv->sv_xdrsize, and reallocing
 797                          * rq_argp and rq_resp
 798                          */
 799                         return -EBUSY;
 800                 if (buf[size-1] != '\n')
 801                         return -EINVAL;
 802                 buf[size-1] = 0;
 803
 804                 vers = mesg;
 805                 len = qword_get(&mesg, vers, size);
 806                 if (len <= 0) return -EINVAL;
 807                 do {
 808                         sign = *vers;
 809                         if (sign == '+' || sign == '-')
 810                                 num = simple_strtol((vers+1), &minorp, 0);
 811                         else
 812                                 num = simple_strtol(vers, &minorp, 0);
 813                         if (*minorp == '.') {
 814                                 if (num < 4)
 815                                         return -EINVAL;
 816                                 minor = simple_strtoul(minorp+1, NULL, 0);
 817                                 if (minor == 0)
 818                                         return -EINVAL;
 819                                 if (nfsd_minorversion(minor, sign == '-' ?
 820                                                      NFSD_CLEAR : NFSD_SET) < 0)
 821                                         return -EINVAL;
 822                                 goto next;
 823                         }
 824                         switch(num) {
 825                         case 2:
 826                         case 3:
 827                         case 4:
 828                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 829                                 break;
 830                         default:
 831                                 return -EINVAL;
 832                         }
 833                 next:
 834                         vers += len + 1;
 835                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 836                 /* If all get turned off, turn them back on, as
 837                  * having no versions is BAD
 838                  */
 839                 nfsd_reset_versions();
 840         }
 841
 842         /* Now write current state into reply buffer */
 843         len = 0;
 844         sep = "";
 845         remaining = SIMPLE_TRANSACTION_LIMIT;
 846         for (num=2 ; num <= 4 ; num++)
 847                 if (nfsd_vers(num, NFSD_AVAIL)) {
 848                         len = snprintf(buf, remaining, "%s%c%d", sep,
 849                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 850                                        num);
 851                         sep = " ";
 852
 853                         if (len > remaining)
 854                                 break;
 855                         remaining -= len;
 856                         buf += len;
 857                         tlen += len;
 858                 }
 859         if (nfsd_vers(4, NFSD_AVAIL))
 860                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 861                      minor++) {
 862                         len = snprintf(buf, remaining, " %c4.%u",
 863                                         (nfsd_vers(4, NFSD_TEST) &&
 864                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 865                                                 '+' : '-',
 866                                         minor);
 867
 868                         if (len > remaining)
 869                                 break;
 870                         remaining -= len;
 871                         buf += len;
 872                         tlen += len;
 873                 }
 874
 875         len = snprintf(buf, remaining, "\n");
 876         if (len > remaining)
 877                 return -EINVAL;
 878         return tlen + len;
 879 }
 880
 881 /**
 882  * write_versions - Set or report the available NFS protocol versions
 883  *
 884  * Input:
 885  *                      buf:            ignored
 886  *                      size:           zero
 887  * Output:
 888  *      On success:     passed-in buffer filled with '\n'-terminated C
 889  *                      string containing positive or negative integer
 890  *                      values representing the current status of each
 891  *                      protocol version;
 892  *                      return code is the size in bytes of the string
 893  *      On error:       return code is zero or a negative errno value
 894  *
 895  * OR
 896  *
 897  * Input:
 898  *                      buf:            C string containing whitespace-
 899  *                                      separated positive or negative
 900  *                                      integer values representing NFS
 901  *                                      protocol versions to enable ("+n")
 902  *                                      or disable ("-n")
 903  *                      size:           non-zero length of C string in @buf
 904  * Output:
 905  *      On success:     status of zero or more protocol versions has
 906  *                      been updated; passed-in buffer filled with
 907  *                      '\n'-terminated C string containing positive
 908  *                      or negative integer values representing the
 909  *                      current status of each protocol version;
 910  *                      return code is the size in bytes of the string
 911  *      On error:       return code is zero or a negative errno value
 912  */
 913 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 914 {
 915         ssize_t rv;
 916
 917         mutex_lock(&nfsd_mutex);
 918         rv = __write_versions(file, buf, size);
 919         mutex_unlock(&nfsd_mutex);
 920         return rv;
 921 }
 922
 923 /*
 924  * Zero-length write.  Return a list of NFSD's current listener
 925  * transports.
 926  */
 927 static ssize_t __write_ports_names(char *buf)
 928 {
 929         if (nfsd_serv == NULL)
 930                 return 0;
 931         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 932 }
 933
 934 /*
 935  * A single 'fd' number was written, in which case it must be for
 936  * a socket of a supported family/protocol, and we use it as an
 937  * nfsd listener.
 938  */
 939 static ssize_t __write_ports_addfd(char *buf)
 940 {
 941         char *mesg = buf;
 942         int fd, err;
 943
 944         err = get_int(&mesg, &fd);
 945         if (err != 0 || fd < 0)
 946                 return -EINVAL;
 947
 948         err = nfsd_create_serv();
 949         if (err != 0)
 950                 return err;
 951
 952         err = lockd_up();
 953         if (err != 0)
 954                 goto out;
 955
 956         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 957         if (err < 0)
 958                 lockd_down();
 959
 960 out:
 961         /* Decrease the count, but don't shut down the service */
 962         nfsd_serv->sv_nrthreads--;
 963         return err;
 964 }
 965
 966 /*
 967  * A '-' followed by the 'name' of a socket means we close the socket.
 968  */
 969 static ssize_t __write_ports_delfd(char *buf)
 970 {
 971         char *toclose;
 972         int len = 0;
 973
 974         toclose = kstrdup(buf + 1, GFP_KERNEL);
 975         if (toclose == NULL)
 976                 return -ENOMEM;
 977
 978         if (nfsd_serv != NULL)
 979                 len = svc_sock_names(nfsd_serv, buf,
 980                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 981         if (len >= 0)
 982                 lockd_down();
 983
 984         kfree(toclose);
 985         return len;
 986 }
 987
 988 /*
 989  * A transport listener is added by writing it's transport name and
 990  * a port number.
 991  */
 992 static ssize_t __write_ports_addxprt(char *buf)
 993 {
 994         char transport[16];
 995         struct svc_xprt *xprt;
 996         int port, err;
 997
 998         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 999                 return -EINVAL;
1000
1001         if (port < 1 || port > USHRT_MAX)
1002                 return -EINVAL;
1003
1004         err = nfsd_create_serv();
1005         if (err != 0)
1006                 return err;
1007
1008         err = svc_create_xprt(nfsd_serv, transport,
1009                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1010         if (err < 0)
1011                 goto out_err;
1012
1013         err = svc_create_xprt(nfsd_serv, transport,
1014                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1015         if (err < 0 && err != -EAFNOSUPPORT)
1016                 goto out_close;
1017         return 0;
1018 out_close:
1019         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1020         if (xprt != NULL) {
1021                 svc_close_xprt(xprt);
1022                 svc_xprt_put(xprt);
1023         }
1024 out_err:
1025         /* Decrease the count, but don't shut down the service */
1026         nfsd_serv->sv_nrthreads--;
1027         return err;
1028 }
1029
1030 /*
1031  * A transport listener is removed by writing a "-", it's transport
1032  * name, and it's port number.
1033  */
1034 static ssize_t __write_ports_delxprt(char *buf)
1035 {
1036         struct svc_xprt *xprt;
1037         char transport[16];
1038         int port;
1039
1040         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1041                 return -EINVAL;
1042
1043         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1044                 return -EINVAL;
1045
1046         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1047         if (xprt == NULL)
1048                 return -ENOTCONN;
1049
1050         svc_close_xprt(xprt);
1051         svc_xprt_put(xprt);
1052         return 0;
1053 }
1054
1055 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1056 {
1057         if (size == 0)
1058                 return __write_ports_names(buf);
1059
1060         if (isdigit(buf[0]))
1061                 return __write_ports_addfd(buf);
1062
1063         if (buf[0] == '-' && isdigit(buf[1]))
1064                 return __write_ports_delfd(buf);
1065
1066         if (isalpha(buf[0]))
1067                 return __write_ports_addxprt(buf);
1068
1069         if (buf[0] == '-' && isalpha(buf[1]))
1070                 return __write_ports_delxprt(buf);
1071
1072         return -EINVAL;
1073 }
1074
1075 /**
1076  * write_ports - Pass a socket file descriptor or transport name to listen on
1077  *
1078  * Input:
1079  *                      buf:            ignored
1080  *                      size:           zero
1081  * Output:
1082  *      On success:     passed-in buffer filled with a '\n'-terminated C
1083  *                      string containing a whitespace-separated list of
1084  *                      named NFSD listeners;
1085  *                      return code is the size in bytes of the string
1086  *      On error:       return code is zero or a negative errno value
1087  *
1088  * OR
1089  *
1090  * Input:
1091  *                      buf:            C string containing an unsigned
1092  *                                      integer value representing a bound
1093  *                                      but unconnected socket that is to be
1094  *                                      used as an NFSD listener; listen(3)
1095  *                                      must be called for a SOCK_STREAM
1096  *                                      socket, otherwise it is ignored
1097  *                      size:           non-zero length of C string in @buf
1098  * Output:
1099  *      On success:     NFS service is started;
1100  *                      passed-in buffer filled with a '\n'-terminated C
1101  *                      string containing a unique alphanumeric name of
1102  *                      the listener;
1103  *                      return code is the size in bytes of the string
1104  *      On error:       return code is a negative errno value
1105  *
1106  * OR
1107  *
1108  * Input:
1109  *                      buf:            C string containing a "-" followed
1110  *                                      by an integer value representing a
1111  *                                      previously passed in socket file
1112  *                                      descriptor
1113  *                      size:           non-zero length of C string in @buf
1114  * Output:
1115  *      On success:     NFS service no longer listens on that socket;
1116  *                      passed-in buffer filled with a '\n'-terminated C
1117  *                      string containing a unique name of the listener;
1118  *                      return code is the size in bytes of the string
1119  *      On error:       return code is a negative errno value
1120  *
1121  * OR
1122  *
1123  * Input:
1124  *                      buf:            C string containing a transport
1125  *                                      name and an unsigned integer value
1126  *                                      representing the port to listen on,
1127  *                                      separated by whitespace
1128  *                      size:           non-zero length of C string in @buf
1129  * Output:
1130  *      On success:     returns zero; NFS service is started
1131  *      On error:       return code is a negative errno value
1132  *
1133  * OR
1134  *
1135  * Input:
1136  *                      buf:            C string containing a "-" followed
1137  *                                      by a transport name and an unsigned
1138  *                                      integer value representing the port
1139  *                                      to listen on, separated by whitespace
1140  *                      size:           non-zero length of C string in @buf
1141  * Output:
1142  *      On success:     returns zero; NFS service no longer listens
1143  *                      on that transport
1144  *      On error:       return code is a negative errno value
1145  */
1146 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1147 {
1148         ssize_t rv;
1149
1150         mutex_lock(&nfsd_mutex);
1151         rv = __write_ports(file, buf, size);
1152         mutex_unlock(&nfsd_mutex);
1153         return rv;
1154 }
1155
1156
1157 int nfsd_max_blksize;
1158
1159 /**
1160  * write_maxblksize - Set or report the current NFS blksize
1161  *
1162  * Input:
1163  *                      buf:            ignored
1164  *                      size:           zero
1165  *
1166  * OR
1167  *
1168  * Input:
1169  *                      buf:            C string containing an unsigned
1170  *                                      integer value representing the new
1171  *                                      NFS blksize
1172  *                      size:           non-zero length of C string in @buf
1173  * Output:
1174  *      On success:     passed-in buffer filled with '\n'-terminated C string
1175  *                      containing numeric value of the current NFS blksize
1176  *                      setting;
1177  *                      return code is the size in bytes of the string
1178  *      On error:       return code is zero or a negative errno value
1179  */
1180 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1181 {
1182         char *mesg = buf;
1183         if (size > 0) {
1184                 int bsize;
1185                 int rv = get_int(&mesg, &bsize);
1186                 if (rv)
1187                         return rv;
1188                 /* force bsize into allowed range and
1189                  * required alignment.
1190                  */
1191                 if (bsize < 1024)
1192                         bsize = 1024;
1193                 if (bsize > NFSSVC_MAXBLKSIZE)
1194                         bsize = NFSSVC_MAXBLKSIZE;
1195                 bsize &= ~(1024-1);
1196                 mutex_lock(&nfsd_mutex);
1197                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1198                         mutex_unlock(&nfsd_mutex);
1199                         return -EBUSY;
1200                 }
1201                 nfsd_max_blksize = bsize;
1202                 mutex_unlock(&nfsd_mutex);
1203         }
1204
1205         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1206                                                         nfsd_max_blksize);
1207 }
1208
1209 #ifdef CONFIG_NFSD_V4
1210 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1211 {
1212         char *mesg = buf;
1213         int rv, i;
1214
1215         if (size > 0) {
1216                 if (nfsd_serv)
1217                         return -EBUSY;
1218                 rv = get_int(&mesg, &i);
1219                 if (rv)
1220                         return rv;
1221                 /*
1222                  * Some sanity checking.  We don't have a reason for
1223                  * these particular numbers, but problems with the
1224                  * extremes are:
1225                  *      - Too short: the briefest network outage may
1226                  *        cause clients to lose all their locks.  Also,
1227                  *        the frequent polling may be wasteful.
1228                  *      - Too long: do you really want reboot recovery
1229                  *        to take more than an hour?  Or to make other
1230                  *        clients wait an hour before being able to
1231                  *        revoke a dead client's locks?
1232                  */
1233                 if (i < 10 || i > 3600)
1234                         return -EINVAL;
1235                 *time = i;
1236         }
1237
1238         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1239 }
1240
1241 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1242 {
1243         ssize_t rv;
1244
1245         mutex_lock(&nfsd_mutex);
1246         rv = __nfsd4_write_time(file, buf, size, time);
1247         mutex_unlock(&nfsd_mutex);
1248         return rv;
1249 }
1250
1251 /**
1252  * write_leasetime - Set or report the current NFSv4 lease time
1253  *
1254  * Input:
1255  *                      buf:            ignored
1256  *                      size:           zero
1257  *
1258  * OR
1259  *
1260  * Input:
1261  *                      buf:            C string containing an unsigned
1262  *                                      integer value representing the new
1263  *                                      NFSv4 lease expiry time
1264  *                      size:           non-zero length of C string in @buf
1265  * Output:
1266  *      On success:     passed-in buffer filled with '\n'-terminated C
1267  *                      string containing unsigned integer value of the
1268  *                      current lease expiry time;
1269  *                      return code is the size in bytes of the string
1270  *      On error:       return code is zero or a negative errno value
1271  */
1272 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1273 {
1274         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1275 }
1276
1277 /**
1278  * write_gracetime - Set or report current NFSv4 grace period time
1279  *
1280  * As above, but sets the time of the NFSv4 grace period.
1281  *
1282  * Note this should never be set to less than the *previous*
1283  * lease-period time, but we don't try to enforce this.  (In the common
1284  * case (a new boot), we don't know what the previous lease time was
1285  * anyway.)
1286  */
1287 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1288 {
1289         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1290 }
1291
1292 extern char *nfs4_recoverydir(void);
1293
1294 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1295 {
1296         char *mesg = buf;
1297         char *recdir;
1298         int len, status;
1299
1300         if (size > 0) {
1301                 if (nfsd_serv)
1302                         return -EBUSY;
1303                 if (size > PATH_MAX || buf[size-1] != '\n')
1304                         return -EINVAL;
1305                 buf[size-1] = 0;
1306
1307                 recdir = mesg;
1308                 len = qword_get(&mesg, recdir, size);
1309                 if (len <= 0)
1310                         return -EINVAL;
1311
1312                 status = nfs4_reset_recoverydir(recdir);
1313         }
1314
1315         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1316                                                         nfs4_recoverydir());
1317 }
1318
1319 /**
1320  * write_recoverydir - Set or report the pathname of the recovery directory
1321  *
1322  * Input:
1323  *                      buf:            ignored
1324  *                      size:           zero
1325  *
1326  * OR
1327  *
1328  * Input:
1329  *                      buf:            C string containing the pathname
1330  *                                      of the directory on a local file
1331  *                                      system containing permanent NFSv4
1332  *                                      recovery data
1333  *                      size:           non-zero length of C string in @buf
1334  * Output:
1335  *      On success:     passed-in buffer filled with '\n'-terminated C string
1336  *                      containing the current recovery pathname setting;
1337  *                      return code is the size in bytes of the string
1338  *      On error:       return code is zero or a negative errno value
1339  */
1340 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1341 {
1342         ssize_t rv;
1343
1344         mutex_lock(&nfsd_mutex);
1345         rv = __write_recoverydir(file, buf, size);
1346         mutex_unlock(&nfsd_mutex);
1347         return rv;
1348 }
1349
1350 #endif
1351
1352 /*----------------------------------------------------------------------------*/
1353 /*
1354  *      populating the filesystem.
1355  */
1356
1357 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1358 {
1359         static struct tree_descr nfsd_files[] = {
1360                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1361                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1362                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1363                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1364                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1365                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1366                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1367                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1368                 [NFSD_Export_features] = {"export_features",
1369                                         &export_features_operations, S_IRUGO},
1370                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1371                                         &transaction_ops, S_IWUSR|S_IRUSR},
1372                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1373                                         &transaction_ops, S_IWUSR|S_IRUSR},
1374                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1375                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1376                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1377                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1378                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1379                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1380                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1381 #ifdef CONFIG_NFSD_V4
1382                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1383                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1384                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1385 #endif
1386                 /* last one */ {""}
1387         };
1388         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1389 }
1390
1391 static int nfsd_get_sb(struct file_system_type *fs_type,
1392         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1393 {
1394         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1395 }
1396
1397 static struct file_system_type nfsd_fs_type = {
1398         .owner          = THIS_MODULE,
1399         .name           = "nfsd",
1400         .get_sb         = nfsd_get_sb,
1401         .kill_sb        = kill_litter_super,
1402 };
1403
1404 #ifdef CONFIG_PROC_FS
1405 static int create_proc_exports_entry(void)
1406 {
1407         struct proc_dir_entry *entry;
1408
1409         entry = proc_mkdir("fs/nfs", NULL);
1410         if (!entry)
1411                 return -ENOMEM;
1412         entry = proc_create("exports", 0, entry, &exports_operations);
1413         if (!entry)
1414                 return -ENOMEM;
1415         return 0;
1416 }
1417 #else /* CONFIG_PROC_FS */
1418 static int create_proc_exports_entry(void)
1419 {
1420         return 0;
1421 }
1422 #endif
1423
1424 static int __init init_nfsd(void)
1425 {
1426         int retval;
1427         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1428
1429         retval = nfs4_state_init(); /* nfs4 locking state */
1430         if (retval)
1431                 return retval;
1432         nfsd_stat_init();       /* Statistics */
1433         retval = nfsd_reply_cache_init();
1434         if (retval)
1435                 goto out_free_stat;
1436         retval = nfsd_export_init();
1437         if (retval)
1438                 goto out_free_cache;
1439         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1440         retval = nfsd_idmap_init();
1441         if (retval)
1442                 goto out_free_lockd;
1443         retval = create_proc_exports_entry();
1444         if (retval)
1445                 goto out_free_idmap;
1446         retval = register_filesystem(&nfsd_fs_type);
1447         if (retval)
1448                 goto out_free_all;
1449         return 0;
1450 out_free_all:
1451         remove_proc_entry("fs/nfs/exports", NULL);
1452         remove_proc_entry("fs/nfs", NULL);
1453 out_free_idmap:
1454         nfsd_idmap_shutdown();
1455 out_free_lockd:
1456         nfsd_lockd_shutdown();
1457         nfsd_export_shutdown();
1458 out_free_cache:
1459         nfsd_reply_cache_shutdown();
1460 out_free_stat:
1461         nfsd_stat_shutdown();
1462         nfsd4_free_slabs();
1463         return retval;
1464 }
1465
1466 static void __exit exit_nfsd(void)
1467 {
1468         nfsd_export_shutdown();
1469         nfsd_reply_cache_shutdown();
1470         remove_proc_entry("fs/nfs/exports", NULL);
1471         remove_proc_entry("fs/nfs", NULL);
1472         nfsd_stat_shutdown();
1473         nfsd_lockd_shutdown();
1474         nfsd_idmap_shutdown();
1475         nfsd4_free_slabs();
1476         unregister_filesystem(&nfsd_fs_type);
1477 }
1478
1479 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1480 MODULE_LICENSE("GPL");
1481 module_init(init_nfsd)
1482 module_exit(exit_nfsd)