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/namei.h>
   8 #include <linux/ctype.h>
   9
  10 #include <linux/nfsd_idmap.h>
  11 #include <linux/sunrpc/svcsock.h>
  12 #include <linux/nfsd/syscall.h>
  13 #include <linux/lockd/lockd.h>
  14 #include <linux/sunrpc/clnt.h>
  15
  16 #include "nfsd.h"
  17 #include "cache.h"
  18
  19 /*
  20  *      We have a single directory with 9 nodes in it.
  21  */
  22 enum {
  23         NFSD_Root = 1,
  24         NFSD_Svc,
  25         NFSD_Add,
  26         NFSD_Del,
  27         NFSD_Export,
  28         NFSD_Unexport,
  29         NFSD_Getfd,
  30         NFSD_Getfs,
  31         NFSD_List,
  32         NFSD_Export_features,
  33         NFSD_Fh,
  34         NFSD_FO_UnlockIP,
  35         NFSD_FO_UnlockFS,
  36         NFSD_Threads,
  37         NFSD_Pool_Threads,
  38         NFSD_Pool_Stats,
  39         NFSD_Versions,
  40         NFSD_Ports,
  41         NFSD_MaxBlkSize,
  42         /*
  43          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  44          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  45          */
  46 #ifdef CONFIG_NFSD_V4
  47         NFSD_Leasetime,
  48         NFSD_Gracetime,
  49         NFSD_RecoveryDir,
  50 #endif
  51 };
  52
  53 /*
  54  * write() for these nodes.
  55  */
  56 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  57 static ssize_t write_add(struct file *file, char *buf, size_t size);
  58 static ssize_t write_del(struct file *file, char *buf, size_t size);
  59 static ssize_t write_export(struct file *file, char *buf, size_t size);
  60 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  61 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  62 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  63 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  64 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  65 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  66 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  67 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  68 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  69 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  70 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  71 #ifdef CONFIG_NFSD_V4
  72 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  73 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  74 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  75 #endif
  76
  77 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  78         [NFSD_Svc] = write_svc,
  79         [NFSD_Add] = write_add,
  80         [NFSD_Del] = write_del,
  81         [NFSD_Export] = write_export,
  82         [NFSD_Unexport] = write_unexport,
  83         [NFSD_Getfd] = write_getfd,
  84         [NFSD_Getfs] = write_getfs,
  85         [NFSD_Fh] = write_filehandle,
  86         [NFSD_FO_UnlockIP] = write_unlock_ip,
  87         [NFSD_FO_UnlockFS] = write_unlock_fs,
  88         [NFSD_Threads] = write_threads,
  89         [NFSD_Pool_Threads] = write_pool_threads,
  90         [NFSD_Versions] = write_versions,
  91         [NFSD_Ports] = write_ports,
  92         [NFSD_MaxBlkSize] = write_maxblksize,
  93 #ifdef CONFIG_NFSD_V4
  94         [NFSD_Leasetime] = write_leasetime,
  95         [NFSD_Gracetime] = write_gracetime,
  96         [NFSD_RecoveryDir] = write_recoverydir,
  97 #endif
  98 };
  99
 100 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 101 {
 102         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 103         char *data;
 104         ssize_t rv;
 105
 106         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 107                 return -EINVAL;
 108
 109         data = simple_transaction_get(file, buf, size);
 110         if (IS_ERR(data))
 111                 return PTR_ERR(data);
 112
 113         rv =  write_op[ino](file, data, size);
 114         if (rv >= 0) {
 115                 simple_transaction_set(file, rv);
 116                 rv = size;
 117         }
 118         return rv;
 119 }
 120
 121 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 122 {
 123         if (! file->private_data) {
 124                 /* An attempt to read a transaction file without writing
 125                  * causes a 0-byte write so that the file can return
 126                  * state information
 127                  */
 128                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 129                 if (rv < 0)
 130                         return rv;
 131         }
 132         return simple_transaction_read(file, buf, size, pos);
 133 }
 134
 135 static const struct file_operations transaction_ops = {
 136         .write          = nfsctl_transaction_write,
 137         .read           = nfsctl_transaction_read,
 138         .release        = simple_transaction_release,
 139 };
 140
 141 static int exports_open(struct inode *inode, struct file *file)
 142 {
 143         return seq_open(file, &nfs_exports_op);
 144 }
 145
 146 static const struct file_operations exports_operations = {
 147         .open           = exports_open,
 148         .read           = seq_read,
 149         .llseek         = seq_lseek,
 150         .release        = seq_release,
 151         .owner          = THIS_MODULE,
 152 };
 153
 154 static int export_features_show(struct seq_file *m, void *v)
 155 {
 156         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 157         return 0;
 158 }
 159
 160 static int export_features_open(struct inode *inode, struct file *file)
 161 {
 162         return single_open(file, export_features_show, NULL);
 163 }
 164
 165 static struct file_operations export_features_operations = {
 166         .open           = export_features_open,
 167         .read           = seq_read,
 168         .llseek         = seq_lseek,
 169         .release        = single_release,
 170 };
 171
 172 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 173 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 174
 175 static const struct file_operations pool_stats_operations = {
 176         .open           = nfsd_pool_stats_open,
 177         .read           = seq_read,
 178         .llseek         = seq_lseek,
 179         .release        = nfsd_pool_stats_release,
 180         .owner          = THIS_MODULE,
 181 };
 182
 183 /*----------------------------------------------------------------------------*/
 184 /*
 185  * payload - write methods
 186  */
 187
 188 /**
 189  * write_svc - Start kernel's NFSD server
 190  *
 191  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 192  * Function remains to support old versions of nfs-utils.
 193  *
 194  * Input:
 195  *                      buf:    struct nfsctl_svc
 196  *                              svc_port:       port number of this
 197  *                                              server's listener
 198  *                              svc_nthreads:   number of threads to start
 199  *                      size:   size in bytes of passed in nfsctl_svc
 200  * Output:
 201  *      On success:     returns zero
 202  *      On error:       return code is negative errno value
 203  */
 204 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 205 {
 206         struct nfsctl_svc *data;
 207         int err;
 208         if (size < sizeof(*data))
 209                 return -EINVAL;
 210         data = (struct nfsctl_svc*) buf;
 211         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 212         if (err < 0)
 213                 return err;
 214         return 0;
 215 }
 216
 217 /**
 218  * write_add - Add or modify client entry in auth unix cache
 219  *
 220  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 221  * Function remains to support old versions of nfs-utils.
 222  *
 223  * Input:
 224  *                      buf:    struct nfsctl_client
 225  *                              cl_ident:       '\0'-terminated C string
 226  *                                              containing domain name
 227  *                                              of client
 228  *                              cl_naddr:       no. of items in cl_addrlist
 229  *                              cl_addrlist:    array of client addresses
 230  *                              cl_fhkeytype:   ignored
 231  *                              cl_fhkeylen:    ignored
 232  *                              cl_fhkey:       ignored
 233  *                      size:   size in bytes of passed in nfsctl_client
 234  * Output:
 235  *      On success:     returns zero
 236  *      On error:       return code is negative errno value
 237  *
 238  * Note: Only AF_INET client addresses are passed in, since
 239  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 240  */
 241 static ssize_t write_add(struct file *file, char *buf, size_t size)
 242 {
 243         struct nfsctl_client *data;
 244         if (size < sizeof(*data))
 245                 return -EINVAL;
 246         data = (struct nfsctl_client *)buf;
 247         return exp_addclient(data);
 248 }
 249
 250 /**
 251  * write_del - Remove client from auth unix cache
 252  *
 253  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 254  * Function remains to support old versions of nfs-utils.
 255  *
 256  * Input:
 257  *                      buf:    struct nfsctl_client
 258  *                              cl_ident:       '\0'-terminated C string
 259  *                                              containing domain name
 260  *                                              of client
 261  *                              cl_naddr:       ignored
 262  *                              cl_addrlist:    ignored
 263  *                              cl_fhkeytype:   ignored
 264  *                              cl_fhkeylen:    ignored
 265  *                              cl_fhkey:       ignored
 266  *                      size:   size in bytes of passed in nfsctl_client
 267  * Output:
 268  *      On success:     returns zero
 269  *      On error:       return code is negative errno value
 270  *
 271  * Note: Only AF_INET client addresses are passed in, since
 272  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 273  */
 274 static ssize_t write_del(struct file *file, char *buf, size_t size)
 275 {
 276         struct nfsctl_client *data;
 277         if (size < sizeof(*data))
 278                 return -EINVAL;
 279         data = (struct nfsctl_client *)buf;
 280         return exp_delclient(data);
 281 }
 282
 283 /**
 284  * write_export - Export part or all of a local file system
 285  *
 286  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 287  * Function remains to support old versions of nfs-utils.
 288  *
 289  * Input:
 290  *                      buf:    struct nfsctl_export
 291  *                              ex_client:      '\0'-terminated C string
 292  *                                              containing domain name
 293  *                                              of client allowed to access
 294  *                                              this export
 295  *                              ex_path:        '\0'-terminated C string
 296  *                                              containing pathname of
 297  *                                              directory in local file system
 298  *                              ex_dev:         fsid to use for this export
 299  *                              ex_ino:         ignored
 300  *                              ex_flags:       export flags for this export
 301  *                              ex_anon_uid:    UID to use for anonymous
 302  *                                              requests
 303  *                              ex_anon_gid:    GID to use for anonymous
 304  *                                              requests
 305  *                      size:   size in bytes of passed in nfsctl_export
 306  * Output:
 307  *      On success:     returns zero
 308  *      On error:       return code is negative errno value
 309  */
 310 static ssize_t write_export(struct file *file, char *buf, size_t size)
 311 {
 312         struct nfsctl_export *data;
 313         if (size < sizeof(*data))
 314                 return -EINVAL;
 315         data = (struct nfsctl_export*)buf;
 316         return exp_export(data);
 317 }
 318
 319 /**
 320  * write_unexport - Unexport a previously exported file system
 321  *
 322  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 323  * Function remains to support old versions of nfs-utils.
 324  *
 325  * Input:
 326  *                      buf:    struct nfsctl_export
 327  *                              ex_client:      '\0'-terminated C string
 328  *                                              containing domain name
 329  *                                              of client no longer allowed
 330  *                                              to access this export
 331  *                              ex_path:        '\0'-terminated C string
 332  *                                              containing pathname of
 333  *                                              directory in local file system
 334  *                              ex_dev:         ignored
 335  *                              ex_ino:         ignored
 336  *                              ex_flags:       ignored
 337  *                              ex_anon_uid:    ignored
 338  *                              ex_anon_gid:    ignored
 339  *                      size:   size in bytes of passed in nfsctl_export
 340  * Output:
 341  *      On success:     returns zero
 342  *      On error:       return code is negative errno value
 343  */
 344 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 345 {
 346         struct nfsctl_export *data;
 347
 348         if (size < sizeof(*data))
 349                 return -EINVAL;
 350         data = (struct nfsctl_export*)buf;
 351         return exp_unexport(data);
 352 }
 353
 354 /**
 355  * write_getfs - Get a variable-length NFS file handle by path
 356  *
 357  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 358  * Function remains to support old versions of nfs-utils.
 359  *
 360  * Input:
 361  *                      buf:    struct nfsctl_fsparm
 362  *                              gd_addr:        socket address of client
 363  *                              gd_path:        '\0'-terminated C string
 364  *                                              containing pathname of
 365  *                                              directory in local file system
 366  *                              gd_maxlen:      maximum size of returned file
 367  *                                              handle
 368  *                      size:   size in bytes of passed in nfsctl_fsparm
 369  * Output:
 370  *      On success:     passed-in buffer filled with a knfsd_fh structure
 371  *                      (a variable-length raw NFS file handle);
 372  *                      return code is the size in bytes of the file handle
 373  *      On error:       return code is negative errno value
 374  *
 375  * Note: Only AF_INET client addresses are passed in, since gd_addr
 376  * is the same size as a struct sockaddr_in.
 377  */
 378 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 379 {
 380         struct nfsctl_fsparm *data;
 381         struct sockaddr_in *sin;
 382         struct auth_domain *clp;
 383         int err = 0;
 384         struct knfsd_fh *res;
 385         struct in6_addr in6;
 386
 387         if (size < sizeof(*data))
 388                 return -EINVAL;
 389         data = (struct nfsctl_fsparm*)buf;
 390         err = -EPROTONOSUPPORT;
 391         if (data->gd_addr.sa_family != AF_INET)
 392                 goto out;
 393         sin = (struct sockaddr_in *)&data->gd_addr;
 394         if (data->gd_maxlen > NFS3_FHSIZE)
 395                 data->gd_maxlen = NFS3_FHSIZE;
 396
 397         res = (struct knfsd_fh*)buf;
 398
 399         exp_readlock();
 400
 401         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 402
 403         clp = auth_unix_lookup(&in6);
 404         if (!clp)
 405                 err = -EPERM;
 406         else {
 407                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 408                 auth_domain_put(clp);
 409         }
 410         exp_readunlock();
 411         if (err == 0)
 412                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 413  out:
 414         return err;
 415 }
 416
 417 /**
 418  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 419  *
 420  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 421  * Function remains to support old versions of nfs-utils.
 422  *
 423  * Input:
 424  *                      buf:    struct nfsctl_fdparm
 425  *                              gd_addr:        socket address of client
 426  *                              gd_path:        '\0'-terminated C string
 427  *                                              containing pathname of
 428  *                                              directory in local file system
 429  *                              gd_version:     fdparm structure version
 430  *                      size:   size in bytes of passed in nfsctl_fdparm
 431  * Output:
 432  *      On success:     passed-in buffer filled with nfsctl_res
 433  *                      (a fixed-length raw NFS file handle);
 434  *                      return code is the size in bytes of the file handle
 435  *      On error:       return code is negative errno value
 436  *
 437  * Note: Only AF_INET client addresses are passed in, since gd_addr
 438  * is the same size as a struct sockaddr_in.
 439  */
 440 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 441 {
 442         struct nfsctl_fdparm *data;
 443         struct sockaddr_in *sin;
 444         struct auth_domain *clp;
 445         int err = 0;
 446         struct knfsd_fh fh;
 447         char *res;
 448         struct in6_addr in6;
 449
 450         if (size < sizeof(*data))
 451                 return -EINVAL;
 452         data = (struct nfsctl_fdparm*)buf;
 453         err = -EPROTONOSUPPORT;
 454         if (data->gd_addr.sa_family != AF_INET)
 455                 goto out;
 456         err = -EINVAL;
 457         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 458                 goto out;
 459
 460         res = buf;
 461         sin = (struct sockaddr_in *)&data->gd_addr;
 462         exp_readlock();
 463
 464         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 465
 466         clp = auth_unix_lookup(&in6);
 467         if (!clp)
 468                 err = -EPERM;
 469         else {
 470                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 471                 auth_domain_put(clp);
 472         }
 473         exp_readunlock();
 474
 475         if (err == 0) {
 476                 memset(res,0, NFS_FHSIZE);
 477                 memcpy(res, &fh.fh_base, fh.fh_size);
 478                 err = NFS_FHSIZE;
 479         }
 480  out:
 481         return err;
 482 }
 483
 484 /**
 485  * write_unlock_ip - Release all locks used by a client
 486  *
 487  * Experimental.
 488  *
 489  * Input:
 490  *                      buf:    '\n'-terminated C string containing a
 491  *                              presentation format IP address
 492  *                      size:   length of C string in @buf
 493  * Output:
 494  *      On success:     returns zero if all specified locks were released;
 495  *                      returns one if one or more locks were not released
 496  *      On error:       return code is negative errno value
 497  */
 498 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 499 {
 500         struct sockaddr_storage address;
 501         struct sockaddr *sap = (struct sockaddr *)&address;
 502         size_t salen = sizeof(address);
 503         char *fo_path;
 504
 505         /* sanity check */
 506         if (size == 0)
 507                 return -EINVAL;
 508
 509         if (buf[size-1] != '\n')
 510                 return -EINVAL;
 511
 512         fo_path = buf;
 513         if (qword_get(&buf, fo_path, size) < 0)
 514                 return -EINVAL;
 515
 516         if (rpc_pton(fo_path, size, sap, salen) == 0)
 517                 return -EINVAL;
 518
 519         return nlmsvc_unlock_all_by_ip(sap);
 520 }
 521
 522 /**
 523  * write_unlock_fs - Release all locks on a local file system
 524  *
 525  * Experimental.
 526  *
 527  * Input:
 528  *                      buf:    '\n'-terminated C string containing the
 529  *                              absolute pathname of a local file system
 530  *                      size:   length of C string in @buf
 531  * Output:
 532  *      On success:     returns zero if all specified locks were released;
 533  *                      returns one if one or more locks were not released
 534  *      On error:       return code is negative errno value
 535  */
 536 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 537 {
 538         struct path path;
 539         char *fo_path;
 540         int error;
 541
 542         /* sanity check */
 543         if (size == 0)
 544                 return -EINVAL;
 545
 546         if (buf[size-1] != '\n')
 547                 return -EINVAL;
 548
 549         fo_path = buf;
 550         if (qword_get(&buf, fo_path, size) < 0)
 551                 return -EINVAL;
 552
 553         error = kern_path(fo_path, 0, &path);
 554         if (error)
 555                 return error;
 556
 557         /*
 558          * XXX: Needs better sanity checking.  Otherwise we could end up
 559          * releasing locks on the wrong file system.
 560          *
 561          * For example:
 562          * 1.  Does the path refer to a directory?
 563          * 2.  Is that directory a mount point, or
 564          * 3.  Is that directory the root of an exported file system?
 565          */
 566         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 567
 568         path_put(&path);
 569         return error;
 570 }
 571
 572 /**
 573  * write_filehandle - Get a variable-length NFS file handle by path
 574  *
 575  * On input, the buffer contains a '\n'-terminated C string comprised of
 576  * three alphanumeric words separated by whitespace.  The string may
 577  * contain escape sequences.
 578  *
 579  * Input:
 580  *                      buf:
 581  *                              domain:         client domain name
 582  *                              path:           export pathname
 583  *                              maxsize:        numeric maximum size of
 584  *                                              @buf
 585  *                      size:   length of C string in @buf
 586  * Output:
 587  *      On success:     passed-in buffer filled with '\n'-terminated C
 588  *                      string containing a ASCII hex text version
 589  *                      of the NFS file handle;
 590  *                      return code is the size in bytes of the string
 591  *      On error:       return code is negative errno value
 592  */
 593 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 594 {
 595         char *dname, *path;
 596         int uninitialized_var(maxsize);
 597         char *mesg = buf;
 598         int len;
 599         struct auth_domain *dom;
 600         struct knfsd_fh fh;
 601
 602         if (size == 0)
 603                 return -EINVAL;
 604
 605         if (buf[size-1] != '\n')
 606                 return -EINVAL;
 607         buf[size-1] = 0;
 608
 609         dname = mesg;
 610         len = qword_get(&mesg, dname, size);
 611         if (len <= 0)
 612                 return -EINVAL;
 613
 614         path = dname+len+1;
 615         len = qword_get(&mesg, path, size);
 616         if (len <= 0)
 617                 return -EINVAL;
 618
 619         len = get_int(&mesg, &maxsize);
 620         if (len)
 621                 return len;
 622
 623         if (maxsize < NFS_FHSIZE)
 624                 return -EINVAL;
 625         if (maxsize > NFS3_FHSIZE)
 626                 maxsize = NFS3_FHSIZE;
 627
 628         if (qword_get(&mesg, mesg, size)>0)
 629                 return -EINVAL;
 630
 631         /* we have all the words, they are in buf.. */
 632         dom = unix_domain_find(dname);
 633         if (!dom)
 634                 return -ENOMEM;
 635
 636         len = exp_rootfh(dom, path, &fh,  maxsize);
 637         auth_domain_put(dom);
 638         if (len)
 639                 return len;
 640
 641         mesg = buf;
 642         len = SIMPLE_TRANSACTION_LIMIT;
 643         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 644         mesg[-1] = '\n';
 645         return mesg - buf;
 646 }
 647
 648 /**
 649  * write_threads - Start NFSD, or report the current number of running threads
 650  *
 651  * Input:
 652  *                      buf:            ignored
 653  *                      size:           zero
 654  * Output:
 655  *      On success:     passed-in buffer filled with '\n'-terminated C
 656  *                      string numeric value representing the number of
 657  *                      running NFSD threads;
 658  *                      return code is the size in bytes of the string
 659  *      On error:       return code is zero
 660  *
 661  * OR
 662  *
 663  * Input:
 664  *                      buf:            C string containing an unsigned
 665  *                                      integer value representing the
 666  *                                      number of NFSD threads to start
 667  *                      size:           non-zero length of C string in @buf
 668  * Output:
 669  *      On success:     NFS service is started;
 670  *                      passed-in buffer filled with '\n'-terminated C
 671  *                      string numeric value representing the number of
 672  *                      running NFSD threads;
 673  *                      return code is the size in bytes of the string
 674  *      On error:       return code is zero or a negative errno value
 675  */
 676 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 677 {
 678         char *mesg = buf;
 679         int rv;
 680         if (size > 0) {
 681                 int newthreads;
 682                 rv = get_int(&mesg, &newthreads);
 683                 if (rv)
 684                         return rv;
 685                 if (newthreads < 0)
 686                         return -EINVAL;
 687                 rv = nfsd_svc(NFS_PORT, newthreads);
 688                 if (rv < 0)
 689                         return rv;
 690         } else
 691                 rv = nfsd_nrthreads();
 692
 693         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 694 }
 695
 696 /**
 697  * write_pool_threads - Set or report the current number of threads per pool
 698  *
 699  * Input:
 700  *                      buf:            ignored
 701  *                      size:           zero
 702  *
 703  * OR
 704  *
 705  * Input:
 706  *                      buf:            C string containing whitespace-
 707  *                                      separated unsigned integer values
 708  *                                      representing the number of NFSD
 709  *                                      threads to start in each pool
 710  *                      size:           non-zero length of C string in @buf
 711  * Output:
 712  *      On success:     passed-in buffer filled with '\n'-terminated C
 713  *                      string containing integer values representing the
 714  *                      number of NFSD threads in each pool;
 715  *                      return code is the size in bytes of the string
 716  *      On error:       return code is zero or a negative errno value
 717  */
 718 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 719 {
 720         /* if size > 0, look for an array of number of threads per node
 721          * and apply them  then write out number of threads per node as reply
 722          */
 723         char *mesg = buf;
 724         int i;
 725         int rv;
 726         int len;
 727         int npools;
 728         int *nthreads;
 729
 730         mutex_lock(&nfsd_mutex);
 731         npools = nfsd_nrpools();
 732         if (npools == 0) {
 733                 /*
 734                  * NFS is shut down.  The admin can start it by
 735                  * writing to the threads file but NOT the pool_threads
 736                  * file, sorry.  Report zero threads.
 737                  */
 738                 mutex_unlock(&nfsd_mutex);
 739                 strcpy(buf, "0\n");
 740                 return strlen(buf);
 741         }
 742
 743         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 744         rv = -ENOMEM;
 745         if (nthreads == NULL)
 746                 goto out_free;
 747
 748         if (size > 0) {
 749                 for (i = 0; i < npools; i++) {
 750                         rv = get_int(&mesg, &nthreads[i]);
 751                         if (rv == -ENOENT)
 752                                 break;          /* fewer numbers than pools */
 753                         if (rv)
 754                                 goto out_free;  /* syntax error */
 755                         rv = -EINVAL;
 756                         if (nthreads[i] < 0)
 757                                 goto out_free;
 758                 }
 759                 rv = nfsd_set_nrthreads(i, nthreads);
 760                 if (rv)
 761                         goto out_free;
 762         }
 763
 764         rv = nfsd_get_nrthreads(npools, nthreads);
 765         if (rv)
 766                 goto out_free;
 767
 768         mesg = buf;
 769         size = SIMPLE_TRANSACTION_LIMIT;
 770         for (i = 0; i < npools && size > 0; i++) {
 771                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 772                 len = strlen(mesg);
 773                 size -= len;
 774                 mesg += len;
 775         }
 776         rv = mesg - buf;
 777 out_free:
 778         kfree(nthreads);
 779         mutex_unlock(&nfsd_mutex);
 780         return rv;
 781 }
 782
 783 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 784 {
 785         char *mesg = buf;
 786         char *vers, *minorp, sign;
 787         int len, num, remaining;
 788         unsigned minor;
 789         ssize_t tlen = 0;
 790         char *sep;
 791
 792         if (size>0) {
 793                 if (nfsd_serv)
 794                         /* Cannot change versions without updating
 795                          * nfsd_serv->sv_xdrsize, and reallocing
 796                          * rq_argp and rq_resp
 797                          */
 798                         return -EBUSY;
 799                 if (buf[size-1] != '\n')
 800                         return -EINVAL;
 801                 buf[size-1] = 0;
 802
 803                 vers = mesg;
 804                 len = qword_get(&mesg, vers, size);
 805                 if (len <= 0) return -EINVAL;
 806                 do {
 807                         sign = *vers;
 808                         if (sign == '+' || sign == '-')
 809                                 num = simple_strtol((vers+1), &minorp, 0);
 810                         else
 811                                 num = simple_strtol(vers, &minorp, 0);
 812                         if (*minorp == '.') {
 813                                 if (num < 4)
 814                                         return -EINVAL;
 815                                 minor = simple_strtoul(minorp+1, NULL, 0);
 816                                 if (minor == 0)
 817                                         return -EINVAL;
 818                                 if (nfsd_minorversion(minor, sign == '-' ?
 819                                                      NFSD_CLEAR : NFSD_SET) < 0)
 820                                         return -EINVAL;
 821                                 goto next;
 822                         }
 823                         switch(num) {
 824                         case 2:
 825                         case 3:
 826                         case 4:
 827                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 828                                 break;
 829                         default:
 830                                 return -EINVAL;
 831                         }
 832                 next:
 833                         vers += len + 1;
 834                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 835                 /* If all get turned off, turn them back on, as
 836                  * having no versions is BAD
 837                  */
 838                 nfsd_reset_versions();
 839         }
 840
 841         /* Now write current state into reply buffer */
 842         len = 0;
 843         sep = "";
 844         remaining = SIMPLE_TRANSACTION_LIMIT;
 845         for (num=2 ; num <= 4 ; num++)
 846                 if (nfsd_vers(num, NFSD_AVAIL)) {
 847                         len = snprintf(buf, remaining, "%s%c%d", sep,
 848                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 849                                        num);
 850                         sep = " ";
 851
 852                         if (len > remaining)
 853                                 break;
 854                         remaining -= len;
 855                         buf += len;
 856                         tlen += len;
 857                 }
 858         if (nfsd_vers(4, NFSD_AVAIL))
 859                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 860                      minor++) {
 861                         len = snprintf(buf, remaining, " %c4.%u",
 862                                         (nfsd_vers(4, NFSD_TEST) &&
 863                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 864                                                 '+' : '-',
 865                                         minor);
 866
 867                         if (len > remaining)
 868                                 break;
 869                         remaining -= len;
 870                         buf += len;
 871                         tlen += len;
 872                 }
 873
 874         len = snprintf(buf, remaining, "\n");
 875         if (len > remaining)
 876                 return -EINVAL;
 877         return tlen + len;
 878 }
 879
 880 /**
 881  * write_versions - Set or report the available NFS protocol versions
 882  *
 883  * Input:
 884  *                      buf:            ignored
 885  *                      size:           zero
 886  * Output:
 887  *      On success:     passed-in buffer filled with '\n'-terminated C
 888  *                      string containing positive or negative integer
 889  *                      values representing the current status of each
 890  *                      protocol version;
 891  *                      return code is the size in bytes of the string
 892  *      On error:       return code is zero or a negative errno value
 893  *
 894  * OR
 895  *
 896  * Input:
 897  *                      buf:            C string containing whitespace-
 898  *                                      separated positive or negative
 899  *                                      integer values representing NFS
 900  *                                      protocol versions to enable ("+n")
 901  *                                      or disable ("-n")
 902  *                      size:           non-zero length of C string in @buf
 903  * Output:
 904  *      On success:     status of zero or more protocol versions has
 905  *                      been updated; passed-in buffer filled with
 906  *                      '\n'-terminated C string containing positive
 907  *                      or negative integer values representing the
 908  *                      current status of each protocol version;
 909  *                      return code is the size in bytes of the string
 910  *      On error:       return code is zero or a negative errno value
 911  */
 912 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 913 {
 914         ssize_t rv;
 915
 916         mutex_lock(&nfsd_mutex);
 917         rv = __write_versions(file, buf, size);
 918         mutex_unlock(&nfsd_mutex);
 919         return rv;
 920 }
 921
 922 /*
 923  * Zero-length write.  Return a list of NFSD's current listener
 924  * transports.
 925  */
 926 static ssize_t __write_ports_names(char *buf)
 927 {
 928         if (nfsd_serv == NULL)
 929                 return 0;
 930         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 931 }
 932
 933 /*
 934  * A single 'fd' number was written, in which case it must be for
 935  * a socket of a supported family/protocol, and we use it as an
 936  * nfsd listener.
 937  */
 938 static ssize_t __write_ports_addfd(char *buf)
 939 {
 940         char *mesg = buf;
 941         int fd, err;
 942
 943         err = get_int(&mesg, &fd);
 944         if (err != 0 || fd < 0)
 945                 return -EINVAL;
 946
 947         err = nfsd_create_serv();
 948         if (err != 0)
 949                 return err;
 950
 951         err = lockd_up();
 952         if (err != 0)
 953                 goto out;
 954
 955         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 956         if (err < 0)
 957                 lockd_down();
 958
 959 out:
 960         /* Decrease the count, but don't shut down the service */
 961         nfsd_serv->sv_nrthreads--;
 962         return err;
 963 }
 964
 965 /*
 966  * A '-' followed by the 'name' of a socket means we close the socket.
 967  */
 968 static ssize_t __write_ports_delfd(char *buf)
 969 {
 970         char *toclose;
 971         int len = 0;
 972
 973         toclose = kstrdup(buf + 1, GFP_KERNEL);
 974         if (toclose == NULL)
 975                 return -ENOMEM;
 976
 977         if (nfsd_serv != NULL)
 978                 len = svc_sock_names(nfsd_serv, buf,
 979                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 980         if (len >= 0)
 981                 lockd_down();
 982
 983         kfree(toclose);
 984         return len;
 985 }
 986
 987 /*
 988  * A transport listener is added by writing it's transport name and
 989  * a port number.
 990  */
 991 static ssize_t __write_ports_addxprt(char *buf)
 992 {
 993         char transport[16];
 994         struct svc_xprt *xprt;
 995         int port, err;
 996
 997         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 998                 return -EINVAL;
 999
1000         if (port < 1 || port > USHORT_MAX)
1001                 return -EINVAL;
1002
1003         err = nfsd_create_serv();
1004         if (err != 0)
1005                 return err;
1006
1007         err = svc_create_xprt(nfsd_serv, transport,
1008                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1009         if (err < 0)
1010                 goto out_err;
1011
1012         err = svc_create_xprt(nfsd_serv, transport,
1013                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1014         if (err < 0 && err != -EAFNOSUPPORT)
1015                 goto out_close;
1016         return 0;
1017 out_close:
1018         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1019         if (xprt != NULL) {
1020                 svc_close_xprt(xprt);
1021                 svc_xprt_put(xprt);
1022         }
1023 out_err:
1024         /* Decrease the count, but don't shut down the service */
1025         nfsd_serv->sv_nrthreads--;
1026         return err;
1027 }
1028
1029 /*
1030  * A transport listener is removed by writing a "-", it's transport
1031  * name, and it's port number.
1032  */
1033 static ssize_t __write_ports_delxprt(char *buf)
1034 {
1035         struct svc_xprt *xprt;
1036         char transport[16];
1037         int port;
1038
1039         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1040                 return -EINVAL;
1041
1042         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1043                 return -EINVAL;
1044
1045         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1046         if (xprt == NULL)
1047                 return -ENOTCONN;
1048
1049         svc_close_xprt(xprt);
1050         svc_xprt_put(xprt);
1051         return 0;
1052 }
1053
1054 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1055 {
1056         if (size == 0)
1057                 return __write_ports_names(buf);
1058
1059         if (isdigit(buf[0]))
1060                 return __write_ports_addfd(buf);
1061
1062         if (buf[0] == '-' && isdigit(buf[1]))
1063                 return __write_ports_delfd(buf);
1064
1065         if (isalpha(buf[0]))
1066                 return __write_ports_addxprt(buf);
1067
1068         if (buf[0] == '-' && isalpha(buf[1]))
1069                 return __write_ports_delxprt(buf);
1070
1071         return -EINVAL;
1072 }
1073
1074 /**
1075  * write_ports - Pass a socket file descriptor or transport name to listen on
1076  *
1077  * Input:
1078  *                      buf:            ignored
1079  *                      size:           zero
1080  * Output:
1081  *      On success:     passed-in buffer filled with a '\n'-terminated C
1082  *                      string containing a whitespace-separated list of
1083  *                      named NFSD listeners;
1084  *                      return code is the size in bytes of the string
1085  *      On error:       return code is zero or a negative errno value
1086  *
1087  * OR
1088  *
1089  * Input:
1090  *                      buf:            C string containing an unsigned
1091  *                                      integer value representing a bound
1092  *                                      but unconnected socket that is to be
1093  *                                      used as an NFSD listener; listen(3)
1094  *                                      must be called for a SOCK_STREAM
1095  *                                      socket, otherwise it is ignored
1096  *                      size:           non-zero length of C string in @buf
1097  * Output:
1098  *      On success:     NFS service is started;
1099  *                      passed-in buffer filled with a '\n'-terminated C
1100  *                      string containing a unique alphanumeric name of
1101  *                      the listener;
1102  *                      return code is the size in bytes of the string
1103  *      On error:       return code is a negative errno value
1104  *
1105  * OR
1106  *
1107  * Input:
1108  *                      buf:            C string containing a "-" followed
1109  *                                      by an integer value representing a
1110  *                                      previously passed in socket file
1111  *                                      descriptor
1112  *                      size:           non-zero length of C string in @buf
1113  * Output:
1114  *      On success:     NFS service no longer listens on that socket;
1115  *                      passed-in buffer filled with a '\n'-terminated C
1116  *                      string containing a unique name of the listener;
1117  *                      return code is the size in bytes of the string
1118  *      On error:       return code is a negative errno value
1119  *
1120  * OR
1121  *
1122  * Input:
1123  *                      buf:            C string containing a transport
1124  *                                      name and an unsigned integer value
1125  *                                      representing the port to listen on,
1126  *                                      separated by whitespace
1127  *                      size:           non-zero length of C string in @buf
1128  * Output:
1129  *      On success:     returns zero; NFS service is started
1130  *      On error:       return code is a negative errno value
1131  *
1132  * OR
1133  *
1134  * Input:
1135  *                      buf:            C string containing a "-" followed
1136  *                                      by a transport name and an unsigned
1137  *                                      integer value representing the port
1138  *                                      to listen on, separated by whitespace
1139  *                      size:           non-zero length of C string in @buf
1140  * Output:
1141  *      On success:     returns zero; NFS service no longer listens
1142  *                      on that transport
1143  *      On error:       return code is a negative errno value
1144  */
1145 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1146 {
1147         ssize_t rv;
1148
1149         mutex_lock(&nfsd_mutex);
1150         rv = __write_ports(file, buf, size);
1151         mutex_unlock(&nfsd_mutex);
1152         return rv;
1153 }
1154
1155
1156 int nfsd_max_blksize;
1157
1158 /**
1159  * write_maxblksize - Set or report the current NFS blksize
1160  *
1161  * Input:
1162  *                      buf:            ignored
1163  *                      size:           zero
1164  *
1165  * OR
1166  *
1167  * Input:
1168  *                      buf:            C string containing an unsigned
1169  *                                      integer value representing the new
1170  *                                      NFS blksize
1171  *                      size:           non-zero length of C string in @buf
1172  * Output:
1173  *      On success:     passed-in buffer filled with '\n'-terminated C string
1174  *                      containing numeric value of the current NFS blksize
1175  *                      setting;
1176  *                      return code is the size in bytes of the string
1177  *      On error:       return code is zero or a negative errno value
1178  */
1179 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1180 {
1181         char *mesg = buf;
1182         if (size > 0) {
1183                 int bsize;
1184                 int rv = get_int(&mesg, &bsize);
1185                 if (rv)
1186                         return rv;
1187                 /* force bsize into allowed range and
1188                  * required alignment.
1189                  */
1190                 if (bsize < 1024)
1191                         bsize = 1024;
1192                 if (bsize > NFSSVC_MAXBLKSIZE)
1193                         bsize = NFSSVC_MAXBLKSIZE;
1194                 bsize &= ~(1024-1);
1195                 mutex_lock(&nfsd_mutex);
1196                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1197                         mutex_unlock(&nfsd_mutex);
1198                         return -EBUSY;
1199                 }
1200                 nfsd_max_blksize = bsize;
1201                 mutex_unlock(&nfsd_mutex);
1202         }
1203
1204         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1205                                                         nfsd_max_blksize);
1206 }
1207
1208 #ifdef CONFIG_NFSD_V4
1209 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1210 {
1211         /* if size > 10 seconds, call
1212          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1213          */
1214         char *mesg = buf;
1215         int rv, i;
1216
1217         if (size > 0) {
1218                 if (nfsd_serv)
1219                         return -EBUSY;
1220                 rv = get_int(&mesg, &i);
1221                 if (rv)
1222                         return rv;
1223                 if (i < 10 || i > 3600)
1224                         return -EINVAL;
1225                 *time = i;
1226         }
1227
1228         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1229 }
1230
1231 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1232 {
1233         ssize_t rv;
1234
1235         mutex_lock(&nfsd_mutex);
1236         rv = __nfsd4_write_time(file, buf, size, time);
1237         mutex_unlock(&nfsd_mutex);
1238         return rv;
1239 }
1240
1241 /**
1242  * write_leasetime - Set or report the current NFSv4 lease time
1243  *
1244  * Input:
1245  *                      buf:            ignored
1246  *                      size:           zero
1247  *
1248  * OR
1249  *
1250  * Input:
1251  *                      buf:            C string containing an unsigned
1252  *                                      integer value representing the new
1253  *                                      NFSv4 lease expiry time
1254  *                      size:           non-zero length of C string in @buf
1255  * Output:
1256  *      On success:     passed-in buffer filled with '\n'-terminated C
1257  *                      string containing unsigned integer value of the
1258  *                      current lease expiry time;
1259  *                      return code is the size in bytes of the string
1260  *      On error:       return code is zero or a negative errno value
1261  */
1262 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1263 {
1264         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1265 }
1266
1267 /**
1268  * write_gracetime - Set or report current NFSv4 grace period time
1269  *
1270  * As above, but sets the time of the NFSv4 grace period.
1271  *
1272  * Note this should never be set to less than the *previous*
1273  * lease-period time, but we don't try to enforce this.  (In the common
1274  * case (a new boot), we don't know what the previous lease time was
1275  * anyway.)
1276  */
1277 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1278 {
1279         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1280 }
1281
1282 extern char *nfs4_recoverydir(void);
1283
1284 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1285 {
1286         char *mesg = buf;
1287         char *recdir;
1288         int len, status;
1289
1290         if (size > 0) {
1291                 if (nfsd_serv)
1292                         return -EBUSY;
1293                 if (size > PATH_MAX || buf[size-1] != '\n')
1294                         return -EINVAL;
1295                 buf[size-1] = 0;
1296
1297                 recdir = mesg;
1298                 len = qword_get(&mesg, recdir, size);
1299                 if (len <= 0)
1300                         return -EINVAL;
1301
1302                 status = nfs4_reset_recoverydir(recdir);
1303         }
1304
1305         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1306                                                         nfs4_recoverydir());
1307 }
1308
1309 /**
1310  * write_recoverydir - Set or report the pathname of the recovery directory
1311  *
1312  * Input:
1313  *                      buf:            ignored
1314  *                      size:           zero
1315  *
1316  * OR
1317  *
1318  * Input:
1319  *                      buf:            C string containing the pathname
1320  *                                      of the directory on a local file
1321  *                                      system containing permanent NFSv4
1322  *                                      recovery data
1323  *                      size:           non-zero length of C string in @buf
1324  * Output:
1325  *      On success:     passed-in buffer filled with '\n'-terminated C string
1326  *                      containing the current recovery pathname setting;
1327  *                      return code is the size in bytes of the string
1328  *      On error:       return code is zero or a negative errno value
1329  */
1330 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1331 {
1332         ssize_t rv;
1333
1334         mutex_lock(&nfsd_mutex);
1335         rv = __write_recoverydir(file, buf, size);
1336         mutex_unlock(&nfsd_mutex);
1337         return rv;
1338 }
1339
1340 #endif
1341
1342 /*----------------------------------------------------------------------------*/
1343 /*
1344  *      populating the filesystem.
1345  */
1346
1347 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1348 {
1349         static struct tree_descr nfsd_files[] = {
1350                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1351                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1352                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1353                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1354                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1355                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1356                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1357                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1358                 [NFSD_Export_features] = {"export_features",
1359                                         &export_features_operations, S_IRUGO},
1360                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1361                                         &transaction_ops, S_IWUSR|S_IRUSR},
1362                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1363                                         &transaction_ops, S_IWUSR|S_IRUSR},
1364                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1365                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1366                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1367                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1368                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1369                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1370                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1371 #ifdef CONFIG_NFSD_V4
1372                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1373                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1374                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1375 #endif
1376                 /* last one */ {""}
1377         };
1378         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1379 }
1380
1381 static int nfsd_get_sb(struct file_system_type *fs_type,
1382         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1383 {
1384         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1385 }
1386
1387 static struct file_system_type nfsd_fs_type = {
1388         .owner          = THIS_MODULE,
1389         .name           = "nfsd",
1390         .get_sb         = nfsd_get_sb,
1391         .kill_sb        = kill_litter_super,
1392 };
1393
1394 #ifdef CONFIG_PROC_FS
1395 static int create_proc_exports_entry(void)
1396 {
1397         struct proc_dir_entry *entry;
1398
1399         entry = proc_mkdir("fs/nfs", NULL);
1400         if (!entry)
1401                 return -ENOMEM;
1402         entry = proc_create("exports", 0, entry, &exports_operations);
1403         if (!entry)
1404                 return -ENOMEM;
1405         return 0;
1406 }
1407 #else /* CONFIG_PROC_FS */
1408 static int create_proc_exports_entry(void)
1409 {
1410         return 0;
1411 }
1412 #endif
1413
1414 static int __init init_nfsd(void)
1415 {
1416         int retval;
1417         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1418
1419         retval = nfs4_state_init(); /* nfs4 locking state */
1420         if (retval)
1421                 return retval;
1422         nfsd_stat_init();       /* Statistics */
1423         retval = nfsd_reply_cache_init();
1424         if (retval)
1425                 goto out_free_stat;
1426         retval = nfsd_export_init();
1427         if (retval)
1428                 goto out_free_cache;
1429         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1430         retval = nfsd_idmap_init();
1431         if (retval)
1432                 goto out_free_lockd;
1433         retval = create_proc_exports_entry();
1434         if (retval)
1435                 goto out_free_idmap;
1436         retval = register_filesystem(&nfsd_fs_type);
1437         if (retval)
1438                 goto out_free_all;
1439         return 0;
1440 out_free_all:
1441         remove_proc_entry("fs/nfs/exports", NULL);
1442         remove_proc_entry("fs/nfs", NULL);
1443 out_free_idmap:
1444         nfsd_idmap_shutdown();
1445 out_free_lockd:
1446         nfsd_lockd_shutdown();
1447         nfsd_export_shutdown();
1448 out_free_cache:
1449         nfsd_reply_cache_shutdown();
1450 out_free_stat:
1451         nfsd_stat_shutdown();
1452         nfsd4_free_slabs();
1453         return retval;
1454 }
1455
1456 static void __exit exit_nfsd(void)
1457 {
1458         nfsd_export_shutdown();
1459         nfsd_reply_cache_shutdown();
1460         remove_proc_entry("fs/nfs/exports", NULL);
1461         remove_proc_entry("fs/nfs", NULL);
1462         nfsd_stat_shutdown();
1463         nfsd_lockd_shutdown();
1464         nfsd_idmap_shutdown();
1465         nfsd4_free_slabs();
1466         unregister_filesystem(&nfsd_fs_type);
1467 }
1468
1469 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1470 MODULE_LICENSE("GPL");
1471 module_init(init_nfsd)
1472 module_exit(exit_nfsd)