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   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/namei.h>
  10 #include <linux/ctype.h>
  11
  12 #include <linux/nfsd_idmap.h>
  13 #include <linux/sunrpc/svcsock.h>
  14 #include <linux/nfsd/syscall.h>
  15 #include <linux/lockd/lockd.h>
  16 #include <linux/sunrpc/clnt.h>
  17
  18 #include "nfsd.h"
  19 #include "cache.h"
  20
  21 /*
  22  *      We have a single directory with 9 nodes in it.
  23  */
  24 enum {
  25         NFSD_Root = 1,
  26         NFSD_Svc,
  27         NFSD_Add,
  28         NFSD_Del,
  29         NFSD_Export,
  30         NFSD_Unexport,
  31         NFSD_Getfd,
  32         NFSD_Getfs,
  33         NFSD_List,
  34         NFSD_Export_features,
  35         NFSD_Fh,
  36         NFSD_FO_UnlockIP,
  37         NFSD_FO_UnlockFS,
  38         NFSD_Threads,
  39         NFSD_Pool_Threads,
  40         NFSD_Pool_Stats,
  41         NFSD_Versions,
  42         NFSD_Ports,
  43         NFSD_MaxBlkSize,
  44         /*
  45          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  46          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  47          */
  48 #ifdef CONFIG_NFSD_V4
  49         NFSD_Leasetime,
  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_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_RecoveryDir] = write_recoverydir,
  96 #endif
  97 };
  98
  99 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 100 {
 101         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 102         char *data;
 103         ssize_t rv;
 104
 105         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 106                 return -EINVAL;
 107
 108         data = simple_transaction_get(file, buf, size);
 109         if (IS_ERR(data))
 110                 return PTR_ERR(data);
 111
 112         rv =  write_op[ino](file, data, size);
 113         if (rv >= 0) {
 114                 simple_transaction_set(file, rv);
 115                 rv = size;
 116         }
 117         return rv;
 118 }
 119
 120 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 121 {
 122         if (! file->private_data) {
 123                 /* An attempt to read a transaction file without writing
 124                  * causes a 0-byte write so that the file can return
 125                  * state information
 126                  */
 127                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 128                 if (rv < 0)
 129                         return rv;
 130         }
 131         return simple_transaction_read(file, buf, size, pos);
 132 }
 133
 134 static const struct file_operations transaction_ops = {
 135         .write          = nfsctl_transaction_write,
 136         .read           = nfsctl_transaction_read,
 137         .release        = simple_transaction_release,
 138 };
 139
 140 static int exports_open(struct inode *inode, struct file *file)
 141 {
 142         return seq_open(file, &nfs_exports_op);
 143 }
 144
 145 static const struct file_operations exports_operations = {
 146         .open           = exports_open,
 147         .read           = seq_read,
 148         .llseek         = seq_lseek,
 149         .release        = seq_release,
 150         .owner          = THIS_MODULE,
 151 };
 152
 153 static int export_features_show(struct seq_file *m, void *v)
 154 {
 155         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 156         return 0;
 157 }
 158
 159 static int export_features_open(struct inode *inode, struct file *file)
 160 {
 161         return single_open(file, export_features_show, NULL);
 162 }
 163
 164 static struct file_operations export_features_operations = {
 165         .open           = export_features_open,
 166         .read           = seq_read,
 167         .llseek         = seq_lseek,
 168         .release        = single_release,
 169 };
 170
 171 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 172 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 173
 174 static const struct file_operations pool_stats_operations = {
 175         .open           = nfsd_pool_stats_open,
 176         .read           = seq_read,
 177         .llseek         = seq_lseek,
 178         .release        = nfsd_pool_stats_release,
 179         .owner          = THIS_MODULE,
 180 };
 181
 182 /*----------------------------------------------------------------------------*/
 183 /*
 184  * payload - write methods
 185  */
 186
 187 /**
 188  * write_svc - Start kernel's NFSD server
 189  *
 190  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 191  * Function remains to support old versions of nfs-utils.
 192  *
 193  * Input:
 194  *                      buf:    struct nfsctl_svc
 195  *                              svc_port:       port number of this
 196  *                                              server's listener
 197  *                              svc_nthreads:   number of threads to start
 198  *                      size:   size in bytes of passed in nfsctl_svc
 199  * Output:
 200  *      On success:     returns zero
 201  *      On error:       return code is negative errno value
 202  */
 203 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 204 {
 205         struct nfsctl_svc *data;
 206         int err;
 207         if (size < sizeof(*data))
 208                 return -EINVAL;
 209         data = (struct nfsctl_svc*) buf;
 210         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 211         if (err < 0)
 212                 return err;
 213         return 0;
 214 }
 215
 216 /**
 217  * write_add - Add or modify client entry in auth unix cache
 218  *
 219  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 220  * Function remains to support old versions of nfs-utils.
 221  *
 222  * Input:
 223  *                      buf:    struct nfsctl_client
 224  *                              cl_ident:       '\0'-terminated C string
 225  *                                              containing domain name
 226  *                                              of client
 227  *                              cl_naddr:       no. of items in cl_addrlist
 228  *                              cl_addrlist:    array of client addresses
 229  *                              cl_fhkeytype:   ignored
 230  *                              cl_fhkeylen:    ignored
 231  *                              cl_fhkey:       ignored
 232  *                      size:   size in bytes of passed in nfsctl_client
 233  * Output:
 234  *      On success:     returns zero
 235  *      On error:       return code is negative errno value
 236  *
 237  * Note: Only AF_INET client addresses are passed in, since
 238  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 239  */
 240 static ssize_t write_add(struct file *file, char *buf, size_t size)
 241 {
 242         struct nfsctl_client *data;
 243         if (size < sizeof(*data))
 244                 return -EINVAL;
 245         data = (struct nfsctl_client *)buf;
 246         return exp_addclient(data);
 247 }
 248
 249 /**
 250  * write_del - Remove client from auth unix cache
 251  *
 252  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 253  * Function remains to support old versions of nfs-utils.
 254  *
 255  * Input:
 256  *                      buf:    struct nfsctl_client
 257  *                              cl_ident:       '\0'-terminated C string
 258  *                                              containing domain name
 259  *                                              of client
 260  *                              cl_naddr:       ignored
 261  *                              cl_addrlist:    ignored
 262  *                              cl_fhkeytype:   ignored
 263  *                              cl_fhkeylen:    ignored
 264  *                              cl_fhkey:       ignored
 265  *                      size:   size in bytes of passed in nfsctl_client
 266  * Output:
 267  *      On success:     returns zero
 268  *      On error:       return code is negative errno value
 269  *
 270  * Note: Only AF_INET client addresses are passed in, since
 271  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 272  */
 273 static ssize_t write_del(struct file *file, char *buf, size_t size)
 274 {
 275         struct nfsctl_client *data;
 276         if (size < sizeof(*data))
 277                 return -EINVAL;
 278         data = (struct nfsctl_client *)buf;
 279         return exp_delclient(data);
 280 }
 281
 282 /**
 283  * write_export - Export part or all of a local file system
 284  *
 285  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 286  * Function remains to support old versions of nfs-utils.
 287  *
 288  * Input:
 289  *                      buf:    struct nfsctl_export
 290  *                              ex_client:      '\0'-terminated C string
 291  *                                              containing domain name
 292  *                                              of client allowed to access
 293  *                                              this export
 294  *                              ex_path:        '\0'-terminated C string
 295  *                                              containing pathname of
 296  *                                              directory in local file system
 297  *                              ex_dev:         fsid to use for this export
 298  *                              ex_ino:         ignored
 299  *                              ex_flags:       export flags for this export
 300  *                              ex_anon_uid:    UID to use for anonymous
 301  *                                              requests
 302  *                              ex_anon_gid:    GID to use for anonymous
 303  *                                              requests
 304  *                      size:   size in bytes of passed in nfsctl_export
 305  * Output:
 306  *      On success:     returns zero
 307  *      On error:       return code is negative errno value
 308  */
 309 static ssize_t write_export(struct file *file, char *buf, size_t size)
 310 {
 311         struct nfsctl_export *data;
 312         if (size < sizeof(*data))
 313                 return -EINVAL;
 314         data = (struct nfsctl_export*)buf;
 315         return exp_export(data);
 316 }
 317
 318 /**
 319  * write_unexport - Unexport a previously exported file system
 320  *
 321  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 322  * Function remains to support old versions of nfs-utils.
 323  *
 324  * Input:
 325  *                      buf:    struct nfsctl_export
 326  *                              ex_client:      '\0'-terminated C string
 327  *                                              containing domain name
 328  *                                              of client no longer allowed
 329  *                                              to access this export
 330  *                              ex_path:        '\0'-terminated C string
 331  *                                              containing pathname of
 332  *                                              directory in local file system
 333  *                              ex_dev:         ignored
 334  *                              ex_ino:         ignored
 335  *                              ex_flags:       ignored
 336  *                              ex_anon_uid:    ignored
 337  *                              ex_anon_gid:    ignored
 338  *                      size:   size in bytes of passed in nfsctl_export
 339  * Output:
 340  *      On success:     returns zero
 341  *      On error:       return code is negative errno value
 342  */
 343 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 344 {
 345         struct nfsctl_export *data;
 346
 347         if (size < sizeof(*data))
 348                 return -EINVAL;
 349         data = (struct nfsctl_export*)buf;
 350         return exp_unexport(data);
 351 }
 352
 353 /**
 354  * write_getfs - Get a variable-length NFS file handle by path
 355  *
 356  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 357  * Function remains to support old versions of nfs-utils.
 358  *
 359  * Input:
 360  *                      buf:    struct nfsctl_fsparm
 361  *                              gd_addr:        socket address of client
 362  *                              gd_path:        '\0'-terminated C string
 363  *                                              containing pathname of
 364  *                                              directory in local file system
 365  *                              gd_maxlen:      maximum size of returned file
 366  *                                              handle
 367  *                      size:   size in bytes of passed in nfsctl_fsparm
 368  * Output:
 369  *      On success:     passed-in buffer filled with a knfsd_fh structure
 370  *                      (a variable-length raw NFS file handle);
 371  *                      return code is the size in bytes of the file handle
 372  *      On error:       return code is negative errno value
 373  *
 374  * Note: Only AF_INET client addresses are passed in, since gd_addr
 375  * is the same size as a struct sockaddr_in.
 376  */
 377 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 378 {
 379         struct nfsctl_fsparm *data;
 380         struct sockaddr_in *sin;
 381         struct auth_domain *clp;
 382         int err = 0;
 383         struct knfsd_fh *res;
 384         struct in6_addr in6;
 385
 386         if (size < sizeof(*data))
 387                 return -EINVAL;
 388         data = (struct nfsctl_fsparm*)buf;
 389         err = -EPROTONOSUPPORT;
 390         if (data->gd_addr.sa_family != AF_INET)
 391                 goto out;
 392         sin = (struct sockaddr_in *)&data->gd_addr;
 393         if (data->gd_maxlen > NFS3_FHSIZE)
 394                 data->gd_maxlen = NFS3_FHSIZE;
 395
 396         res = (struct knfsd_fh*)buf;
 397
 398         exp_readlock();
 399
 400         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 401
 402         clp = auth_unix_lookup(&in6);
 403         if (!clp)
 404                 err = -EPERM;
 405         else {
 406                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 407                 auth_domain_put(clp);
 408         }
 409         exp_readunlock();
 410         if (err == 0)
 411                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 412  out:
 413         return err;
 414 }
 415
 416 /**
 417  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 418  *
 419  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 420  * Function remains to support old versions of nfs-utils.
 421  *
 422  * Input:
 423  *                      buf:    struct nfsctl_fdparm
 424  *                              gd_addr:        socket address of client
 425  *                              gd_path:        '\0'-terminated C string
 426  *                                              containing pathname of
 427  *                                              directory in local file system
 428  *                              gd_version:     fdparm structure version
 429  *                      size:   size in bytes of passed in nfsctl_fdparm
 430  * Output:
 431  *      On success:     passed-in buffer filled with nfsctl_res
 432  *                      (a fixed-length raw NFS file handle);
 433  *                      return code is the size in bytes of the file handle
 434  *      On error:       return code is negative errno value
 435  *
 436  * Note: Only AF_INET client addresses are passed in, since gd_addr
 437  * is the same size as a struct sockaddr_in.
 438  */
 439 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 440 {
 441         struct nfsctl_fdparm *data;
 442         struct sockaddr_in *sin;
 443         struct auth_domain *clp;
 444         int err = 0;
 445         struct knfsd_fh fh;
 446         char *res;
 447         struct in6_addr in6;
 448
 449         if (size < sizeof(*data))
 450                 return -EINVAL;
 451         data = (struct nfsctl_fdparm*)buf;
 452         err = -EPROTONOSUPPORT;
 453         if (data->gd_addr.sa_family != AF_INET)
 454                 goto out;
 455         err = -EINVAL;
 456         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 457                 goto out;
 458
 459         res = buf;
 460         sin = (struct sockaddr_in *)&data->gd_addr;
 461         exp_readlock();
 462
 463         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 464
 465         clp = auth_unix_lookup(&in6);
 466         if (!clp)
 467                 err = -EPERM;
 468         else {
 469                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 470                 auth_domain_put(clp);
 471         }
 472         exp_readunlock();
 473
 474         if (err == 0) {
 475                 memset(res,0, NFS_FHSIZE);
 476                 memcpy(res, &fh.fh_base, fh.fh_size);
 477                 err = NFS_FHSIZE;
 478         }
 479  out:
 480         return err;
 481 }
 482
 483 /**
 484  * write_unlock_ip - Release all locks used by a client
 485  *
 486  * Experimental.
 487  *
 488  * Input:
 489  *                      buf:    '\n'-terminated C string containing a
 490  *                              presentation format IP address
 491  *                      size:   length of C string in @buf
 492  * Output:
 493  *      On success:     returns zero if all specified locks were released;
 494  *                      returns one if one or more locks were not released
 495  *      On error:       return code is negative errno value
 496  */
 497 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 498 {
 499         struct sockaddr_storage address;
 500         struct sockaddr *sap = (struct sockaddr *)&address;
 501         size_t salen = sizeof(address);
 502         char *fo_path;
 503
 504         /* sanity check */
 505         if (size == 0)
 506                 return -EINVAL;
 507
 508         if (buf[size-1] != '\n')
 509                 return -EINVAL;
 510
 511         fo_path = buf;
 512         if (qword_get(&buf, fo_path, size) < 0)
 513                 return -EINVAL;
 514
 515         if (rpc_pton(fo_path, size, sap, salen) == 0)
 516                 return -EINVAL;
 517
 518         return nlmsvc_unlock_all_by_ip(sap);
 519 }
 520
 521 /**
 522  * write_unlock_fs - Release all locks on a local file system
 523  *
 524  * Experimental.
 525  *
 526  * Input:
 527  *                      buf:    '\n'-terminated C string containing the
 528  *                              absolute pathname of a local file system
 529  *                      size:   length of C string in @buf
 530  * Output:
 531  *      On success:     returns zero if all specified locks were released;
 532  *                      returns one if one or more locks were not released
 533  *      On error:       return code is negative errno value
 534  */
 535 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 536 {
 537         struct path path;
 538         char *fo_path;
 539         int error;
 540
 541         /* sanity check */
 542         if (size == 0)
 543                 return -EINVAL;
 544
 545         if (buf[size-1] != '\n')
 546                 return -EINVAL;
 547
 548         fo_path = buf;
 549         if (qword_get(&buf, fo_path, size) < 0)
 550                 return -EINVAL;
 551
 552         error = kern_path(fo_path, 0, &path);
 553         if (error)
 554                 return error;
 555
 556         /*
 557          * XXX: Needs better sanity checking.  Otherwise we could end up
 558          * releasing locks on the wrong file system.
 559          *
 560          * For example:
 561          * 1.  Does the path refer to a directory?
 562          * 2.  Is that directory a mount point, or
 563          * 3.  Is that directory the root of an exported file system?
 564          */
 565         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 566
 567         path_put(&path);
 568         return error;
 569 }
 570
 571 /**
 572  * write_filehandle - Get a variable-length NFS file handle by path
 573  *
 574  * On input, the buffer contains a '\n'-terminated C string comprised of
 575  * three alphanumeric words separated by whitespace.  The string may
 576  * contain escape sequences.
 577  *
 578  * Input:
 579  *                      buf:
 580  *                              domain:         client domain name
 581  *                              path:           export pathname
 582  *                              maxsize:        numeric maximum size of
 583  *                                              @buf
 584  *                      size:   length of C string in @buf
 585  * Output:
 586  *      On success:     passed-in buffer filled with '\n'-terminated C
 587  *                      string containing a ASCII hex text version
 588  *                      of the NFS file handle;
 589  *                      return code is the size in bytes of the string
 590  *      On error:       return code is negative errno value
 591  */
 592 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 593 {
 594         char *dname, *path;
 595         int uninitialized_var(maxsize);
 596         char *mesg = buf;
 597         int len;
 598         struct auth_domain *dom;
 599         struct knfsd_fh fh;
 600
 601         if (size == 0)
 602                 return -EINVAL;
 603
 604         if (buf[size-1] != '\n')
 605                 return -EINVAL;
 606         buf[size-1] = 0;
 607
 608         dname = mesg;
 609         len = qword_get(&mesg, dname, size);
 610         if (len <= 0)
 611                 return -EINVAL;
 612
 613         path = dname+len+1;
 614         len = qword_get(&mesg, path, size);
 615         if (len <= 0)
 616                 return -EINVAL;
 617
 618         len = get_int(&mesg, &maxsize);
 619         if (len)
 620                 return len;
 621
 622         if (maxsize < NFS_FHSIZE)
 623                 return -EINVAL;
 624         if (maxsize > NFS3_FHSIZE)
 625                 maxsize = NFS3_FHSIZE;
 626
 627         if (qword_get(&mesg, mesg, size)>0)
 628                 return -EINVAL;
 629
 630         /* we have all the words, they are in buf.. */
 631         dom = unix_domain_find(dname);
 632         if (!dom)
 633                 return -ENOMEM;
 634
 635         len = exp_rootfh(dom, path, &fh,  maxsize);
 636         auth_domain_put(dom);
 637         if (len)
 638                 return len;
 639
 640         mesg = buf;
 641         len = SIMPLE_TRANSACTION_LIMIT;
 642         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 643         mesg[-1] = '\n';
 644         return mesg - buf;
 645 }
 646
 647 /**
 648  * write_threads - Start NFSD, or report the current number of running threads
 649  *
 650  * Input:
 651  *                      buf:            ignored
 652  *                      size:           zero
 653  * Output:
 654  *      On success:     passed-in buffer filled with '\n'-terminated C
 655  *                      string numeric value representing the number of
 656  *                      running NFSD threads;
 657  *                      return code is the size in bytes of the string
 658  *      On error:       return code is zero
 659  *
 660  * OR
 661  *
 662  * Input:
 663  *                      buf:            C string containing an unsigned
 664  *                                      integer value representing the
 665  *                                      number of NFSD threads to start
 666  *                      size:           non-zero length of C string in @buf
 667  * Output:
 668  *      On success:     NFS service is started;
 669  *                      passed-in buffer filled with '\n'-terminated C
 670  *                      string numeric value representing the number of
 671  *                      running NFSD threads;
 672  *                      return code is the size in bytes of the string
 673  *      On error:       return code is zero or a negative errno value
 674  */
 675 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 676 {
 677         char *mesg = buf;
 678         int rv;
 679         if (size > 0) {
 680                 int newthreads;
 681                 rv = get_int(&mesg, &newthreads);
 682                 if (rv)
 683                         return rv;
 684                 if (newthreads < 0)
 685                         return -EINVAL;
 686                 rv = nfsd_svc(NFS_PORT, newthreads);
 687                 if (rv < 0)
 688                         return rv;
 689         } else
 690                 rv = nfsd_nrthreads();
 691
 692         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 693 }
 694
 695 /**
 696  * write_pool_threads - Set or report the current number of threads per pool
 697  *
 698  * Input:
 699  *                      buf:            ignored
 700  *                      size:           zero
 701  *
 702  * OR
 703  *
 704  * Input:
 705  *                      buf:            C string containing whitespace-
 706  *                                      separated unsigned integer values
 707  *                                      representing the number of NFSD
 708  *                                      threads to start in each pool
 709  *                      size:           non-zero length of C string in @buf
 710  * Output:
 711  *      On success:     passed-in buffer filled with '\n'-terminated C
 712  *                      string containing integer values representing the
 713  *                      number of NFSD threads in each pool;
 714  *                      return code is the size in bytes of the string
 715  *      On error:       return code is zero or a negative errno value
 716  */
 717 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 718 {
 719         /* if size > 0, look for an array of number of threads per node
 720          * and apply them  then write out number of threads per node as reply
 721          */
 722         char *mesg = buf;
 723         int i;
 724         int rv;
 725         int len;
 726         int npools;
 727         int *nthreads;
 728
 729         mutex_lock(&nfsd_mutex);
 730         npools = nfsd_nrpools();
 731         if (npools == 0) {
 732                 /*
 733                  * NFS is shut down.  The admin can start it by
 734                  * writing to the threads file but NOT the pool_threads
 735                  * file, sorry.  Report zero threads.
 736                  */
 737                 mutex_unlock(&nfsd_mutex);
 738                 strcpy(buf, "0\n");
 739                 return strlen(buf);
 740         }
 741
 742         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 743         rv = -ENOMEM;
 744         if (nthreads == NULL)
 745                 goto out_free;
 746
 747         if (size > 0) {
 748                 for (i = 0; i < npools; i++) {
 749                         rv = get_int(&mesg, &nthreads[i]);
 750                         if (rv == -ENOENT)
 751                                 break;          /* fewer numbers than pools */
 752                         if (rv)
 753                                 goto out_free;  /* syntax error */
 754                         rv = -EINVAL;
 755                         if (nthreads[i] < 0)
 756                                 goto out_free;
 757                 }
 758                 rv = nfsd_set_nrthreads(i, nthreads);
 759                 if (rv)
 760                         goto out_free;
 761         }
 762
 763         rv = nfsd_get_nrthreads(npools, nthreads);
 764         if (rv)
 765                 goto out_free;
 766
 767         mesg = buf;
 768         size = SIMPLE_TRANSACTION_LIMIT;
 769         for (i = 0; i < npools && size > 0; i++) {
 770                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 771                 len = strlen(mesg);
 772                 size -= len;
 773                 mesg += len;
 774         }
 775         rv = mesg - buf;
 776 out_free:
 777         kfree(nthreads);
 778         mutex_unlock(&nfsd_mutex);
 779         return rv;
 780 }
 781
 782 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 783 {
 784         char *mesg = buf;
 785         char *vers, *minorp, sign;
 786         int len, num, remaining;
 787         unsigned minor;
 788         ssize_t tlen = 0;
 789         char *sep;
 790
 791         if (size>0) {
 792                 if (nfsd_serv)
 793                         /* Cannot change versions without updating
 794                          * nfsd_serv->sv_xdrsize, and reallocing
 795                          * rq_argp and rq_resp
 796                          */
 797                         return -EBUSY;
 798                 if (buf[size-1] != '\n')
 799                         return -EINVAL;
 800                 buf[size-1] = 0;
 801
 802                 vers = mesg;
 803                 len = qword_get(&mesg, vers, size);
 804                 if (len <= 0) return -EINVAL;
 805                 do {
 806                         sign = *vers;
 807                         if (sign == '+' || sign == '-')
 808                                 num = simple_strtol((vers+1), &minorp, 0);
 809                         else
 810                                 num = simple_strtol(vers, &minorp, 0);
 811                         if (*minorp == '.') {
 812                                 if (num < 4)
 813                                         return -EINVAL;
 814                                 minor = simple_strtoul(minorp+1, NULL, 0);
 815                                 if (minor == 0)
 816                                         return -EINVAL;
 817                                 if (nfsd_minorversion(minor, sign == '-' ?
 818                                                      NFSD_CLEAR : NFSD_SET) < 0)
 819                                         return -EINVAL;
 820                                 goto next;
 821                         }
 822                         switch(num) {
 823                         case 2:
 824                         case 3:
 825                         case 4:
 826                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 827                                 break;
 828                         default:
 829                                 return -EINVAL;
 830                         }
 831                 next:
 832                         vers += len + 1;
 833                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 834                 /* If all get turned off, turn them back on, as
 835                  * having no versions is BAD
 836                  */
 837                 nfsd_reset_versions();
 838         }
 839
 840         /* Now write current state into reply buffer */
 841         len = 0;
 842         sep = "";
 843         remaining = SIMPLE_TRANSACTION_LIMIT;
 844         for (num=2 ; num <= 4 ; num++)
 845                 if (nfsd_vers(num, NFSD_AVAIL)) {
 846                         len = snprintf(buf, remaining, "%s%c%d", sep,
 847                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 848                                        num);
 849                         sep = " ";
 850
 851                         if (len > remaining)
 852                                 break;
 853                         remaining -= len;
 854                         buf += len;
 855                         tlen += len;
 856                 }
 857         if (nfsd_vers(4, NFSD_AVAIL))
 858                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 859                      minor++) {
 860                         len = snprintf(buf, remaining, " %c4.%u",
 861                                         (nfsd_vers(4, NFSD_TEST) &&
 862                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 863                                                 '+' : '-',
 864                                         minor);
 865
 866                         if (len > remaining)
 867                                 break;
 868                         remaining -= len;
 869                         buf += len;
 870                         tlen += len;
 871                 }
 872
 873         len = snprintf(buf, remaining, "\n");
 874         if (len > remaining)
 875                 return -EINVAL;
 876         return tlen + len;
 877 }
 878
 879 /**
 880  * write_versions - Set or report the available NFS protocol versions
 881  *
 882  * Input:
 883  *                      buf:            ignored
 884  *                      size:           zero
 885  * Output:
 886  *      On success:     passed-in buffer filled with '\n'-terminated C
 887  *                      string containing positive or negative integer
 888  *                      values representing the current status of each
 889  *                      protocol version;
 890  *                      return code is the size in bytes of the string
 891  *      On error:       return code is zero or a negative errno value
 892  *
 893  * OR
 894  *
 895  * Input:
 896  *                      buf:            C string containing whitespace-
 897  *                                      separated positive or negative
 898  *                                      integer values representing NFS
 899  *                                      protocol versions to enable ("+n")
 900  *                                      or disable ("-n")
 901  *                      size:           non-zero length of C string in @buf
 902  * Output:
 903  *      On success:     status of zero or more protocol versions has
 904  *                      been updated; passed-in buffer filled with
 905  *                      '\n'-terminated C string containing positive
 906  *                      or negative integer values representing the
 907  *                      current status of each protocol version;
 908  *                      return code is the size in bytes of the string
 909  *      On error:       return code is zero or a negative errno value
 910  */
 911 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 912 {
 913         ssize_t rv;
 914
 915         mutex_lock(&nfsd_mutex);
 916         rv = __write_versions(file, buf, size);
 917         mutex_unlock(&nfsd_mutex);
 918         return rv;
 919 }
 920
 921 /*
 922  * Zero-length write.  Return a list of NFSD's current listener
 923  * transports.
 924  */
 925 static ssize_t __write_ports_names(char *buf)
 926 {
 927         if (nfsd_serv == NULL)
 928                 return 0;
 929         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 930 }
 931
 932 /*
 933  * A single 'fd' number was written, in which case it must be for
 934  * a socket of a supported family/protocol, and we use it as an
 935  * nfsd listener.
 936  */
 937 static ssize_t __write_ports_addfd(char *buf)
 938 {
 939         char *mesg = buf;
 940         int fd, err;
 941
 942         err = get_int(&mesg, &fd);
 943         if (err != 0 || fd < 0)
 944                 return -EINVAL;
 945
 946         err = nfsd_create_serv();
 947         if (err != 0)
 948                 return err;
 949
 950         err = lockd_up();
 951         if (err != 0)
 952                 goto out;
 953
 954         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 955         if (err < 0)
 956                 lockd_down();
 957
 958 out:
 959         /* Decrease the count, but don't shut down the service */
 960         nfsd_serv->sv_nrthreads--;
 961         return err;
 962 }
 963
 964 /*
 965  * A '-' followed by the 'name' of a socket means we close the socket.
 966  */
 967 static ssize_t __write_ports_delfd(char *buf)
 968 {
 969         char *toclose;
 970         int len = 0;
 971
 972         toclose = kstrdup(buf + 1, GFP_KERNEL);
 973         if (toclose == NULL)
 974                 return -ENOMEM;
 975
 976         if (nfsd_serv != NULL)
 977                 len = svc_sock_names(nfsd_serv, buf,
 978                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 979         if (len >= 0)
 980                 lockd_down();
 981
 982         kfree(toclose);
 983         return len;
 984 }
 985
 986 /*
 987  * A transport listener is added by writing it's transport name and
 988  * a port number.
 989  */
 990 static ssize_t __write_ports_addxprt(char *buf)
 991 {
 992         char transport[16];
 993         int port, err;
 994
 995         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 996                 return -EINVAL;
 997
 998         if (port < 1 || port > USHORT_MAX)
 999                 return -EINVAL;
1000
1001         err = nfsd_create_serv();
1002         if (err != 0)
1003                 return err;
1004
1005         err = svc_create_xprt(nfsd_serv, transport,
1006                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1007         if (err < 0) {
1008                 /* Give a reasonable perror msg for bad transport string */
1009                 if (err == -ENOENT)
1010                         err = -EPROTONOSUPPORT;
1011                 return err;
1012         }
1013         return 0;
1014 }
1015
1016 /*
1017  * A transport listener is removed by writing a "-", it's transport
1018  * name, and it's port number.
1019  */
1020 static ssize_t __write_ports_delxprt(char *buf)
1021 {
1022         struct svc_xprt *xprt;
1023         char transport[16];
1024         int port;
1025
1026         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1027                 return -EINVAL;
1028
1029         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1030                 return -EINVAL;
1031
1032         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1033         if (xprt == NULL)
1034                 return -ENOTCONN;
1035
1036         svc_close_xprt(xprt);
1037         svc_xprt_put(xprt);
1038         return 0;
1039 }
1040
1041 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1042 {
1043         if (size == 0)
1044                 return __write_ports_names(buf);
1045
1046         if (isdigit(buf[0]))
1047                 return __write_ports_addfd(buf);
1048
1049         if (buf[0] == '-' && isdigit(buf[1]))
1050                 return __write_ports_delfd(buf);
1051
1052         if (isalpha(buf[0]))
1053                 return __write_ports_addxprt(buf);
1054
1055         if (buf[0] == '-' && isalpha(buf[1]))
1056                 return __write_ports_delxprt(buf);
1057
1058         return -EINVAL;
1059 }
1060
1061 /**
1062  * write_ports - Pass a socket file descriptor or transport name to listen on
1063  *
1064  * Input:
1065  *                      buf:            ignored
1066  *                      size:           zero
1067  * Output:
1068  *      On success:     passed-in buffer filled with a '\n'-terminated C
1069  *                      string containing a whitespace-separated list of
1070  *                      named NFSD listeners;
1071  *                      return code is the size in bytes of the string
1072  *      On error:       return code is zero or a negative errno value
1073  *
1074  * OR
1075  *
1076  * Input:
1077  *                      buf:            C string containing an unsigned
1078  *                                      integer value representing a bound
1079  *                                      but unconnected socket that is to be
1080  *                                      used as an NFSD listener; listen(3)
1081  *                                      must be called for a SOCK_STREAM
1082  *                                      socket, otherwise it is ignored
1083  *                      size:           non-zero length of C string in @buf
1084  * Output:
1085  *      On success:     NFS service is started;
1086  *                      passed-in buffer filled with a '\n'-terminated C
1087  *                      string containing a unique alphanumeric name of
1088  *                      the listener;
1089  *                      return code is the size in bytes of the string
1090  *      On error:       return code is a negative errno value
1091  *
1092  * OR
1093  *
1094  * Input:
1095  *                      buf:            C string containing a "-" followed
1096  *                                      by an integer value representing a
1097  *                                      previously passed in socket file
1098  *                                      descriptor
1099  *                      size:           non-zero length of C string in @buf
1100  * Output:
1101  *      On success:     NFS service no longer listens on that socket;
1102  *                      passed-in buffer filled with a '\n'-terminated C
1103  *                      string containing a unique name of the listener;
1104  *                      return code is the size in bytes of the string
1105  *      On error:       return code is a negative errno value
1106  *
1107  * OR
1108  *
1109  * Input:
1110  *                      buf:            C string containing a transport
1111  *                                      name and an unsigned integer value
1112  *                                      representing the port to listen on,
1113  *                                      separated by whitespace
1114  *                      size:           non-zero length of C string in @buf
1115  * Output:
1116  *      On success:     returns zero; NFS service is started
1117  *      On error:       return code is a negative errno value
1118  *
1119  * OR
1120  *
1121  * Input:
1122  *                      buf:            C string containing a "-" followed
1123  *                                      by a transport name and an unsigned
1124  *                                      integer value representing the port
1125  *                                      to listen on, separated by whitespace
1126  *                      size:           non-zero length of C string in @buf
1127  * Output:
1128  *      On success:     returns zero; NFS service no longer listens
1129  *                      on that transport
1130  *      On error:       return code is a negative errno value
1131  */
1132 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1133 {
1134         ssize_t rv;
1135
1136         mutex_lock(&nfsd_mutex);
1137         rv = __write_ports(file, buf, size);
1138         mutex_unlock(&nfsd_mutex);
1139         return rv;
1140 }
1141
1142
1143 int nfsd_max_blksize;
1144
1145 /**
1146  * write_maxblksize - Set or report the current NFS blksize
1147  *
1148  * Input:
1149  *                      buf:            ignored
1150  *                      size:           zero
1151  *
1152  * OR
1153  *
1154  * Input:
1155  *                      buf:            C string containing an unsigned
1156  *                                      integer value representing the new
1157  *                                      NFS blksize
1158  *                      size:           non-zero length of C string in @buf
1159  * Output:
1160  *      On success:     passed-in buffer filled with '\n'-terminated C string
1161  *                      containing numeric value of the current NFS blksize
1162  *                      setting;
1163  *                      return code is the size in bytes of the string
1164  *      On error:       return code is zero or a negative errno value
1165  */
1166 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1167 {
1168         char *mesg = buf;
1169         if (size > 0) {
1170                 int bsize;
1171                 int rv = get_int(&mesg, &bsize);
1172                 if (rv)
1173                         return rv;
1174                 /* force bsize into allowed range and
1175                  * required alignment.
1176                  */
1177                 if (bsize < 1024)
1178                         bsize = 1024;
1179                 if (bsize > NFSSVC_MAXBLKSIZE)
1180                         bsize = NFSSVC_MAXBLKSIZE;
1181                 bsize &= ~(1024-1);
1182                 mutex_lock(&nfsd_mutex);
1183                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1184                         mutex_unlock(&nfsd_mutex);
1185                         return -EBUSY;
1186                 }
1187                 nfsd_max_blksize = bsize;
1188                 mutex_unlock(&nfsd_mutex);
1189         }
1190
1191         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1192                                                         nfsd_max_blksize);
1193 }
1194
1195 #ifdef CONFIG_NFSD_V4
1196 extern time_t nfs4_leasetime(void);
1197
1198 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1199 {
1200         /* if size > 10 seconds, call
1201          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1202          */
1203         char *mesg = buf;
1204         int rv, lease;
1205
1206         if (size > 0) {
1207                 if (nfsd_serv)
1208                         return -EBUSY;
1209                 rv = get_int(&mesg, &lease);
1210                 if (rv)
1211                         return rv;
1212                 if (lease < 10 || lease > 3600)
1213                         return -EINVAL;
1214                 nfs4_reset_lease(lease);
1215         }
1216
1217         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1218                                                         nfs4_lease_time());
1219 }
1220
1221 /**
1222  * write_leasetime - Set or report the current NFSv4 lease time
1223  *
1224  * Input:
1225  *                      buf:            ignored
1226  *                      size:           zero
1227  *
1228  * OR
1229  *
1230  * Input:
1231  *                      buf:            C string containing an unsigned
1232  *                                      integer value representing the new
1233  *                                      NFSv4 lease expiry time
1234  *                      size:           non-zero length of C string in @buf
1235  * Output:
1236  *      On success:     passed-in buffer filled with '\n'-terminated C
1237  *                      string containing unsigned integer value of the
1238  *                      current lease expiry time;
1239  *                      return code is the size in bytes of the string
1240  *      On error:       return code is zero or a negative errno value
1241  */
1242 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1243 {
1244         ssize_t rv;
1245
1246         mutex_lock(&nfsd_mutex);
1247         rv = __write_leasetime(file, buf, size);
1248         mutex_unlock(&nfsd_mutex);
1249         return rv;
1250 }
1251
1252 extern char *nfs4_recoverydir(void);
1253
1254 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1255 {
1256         char *mesg = buf;
1257         char *recdir;
1258         int len, status;
1259
1260         if (size > 0) {
1261                 if (nfsd_serv)
1262                         return -EBUSY;
1263                 if (size > PATH_MAX || buf[size-1] != '\n')
1264                         return -EINVAL;
1265                 buf[size-1] = 0;
1266
1267                 recdir = mesg;
1268                 len = qword_get(&mesg, recdir, size);
1269                 if (len <= 0)
1270                         return -EINVAL;
1271
1272                 status = nfs4_reset_recoverydir(recdir);
1273         }
1274
1275         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1276                                                         nfs4_recoverydir());
1277 }
1278
1279 /**
1280  * write_recoverydir - Set or report the pathname of the recovery directory
1281  *
1282  * Input:
1283  *                      buf:            ignored
1284  *                      size:           zero
1285  *
1286  * OR
1287  *
1288  * Input:
1289  *                      buf:            C string containing the pathname
1290  *                                      of the directory on a local file
1291  *                                      system containing permanent NFSv4
1292  *                                      recovery data
1293  *                      size:           non-zero length of C string in @buf
1294  * Output:
1295  *      On success:     passed-in buffer filled with '\n'-terminated C string
1296  *                      containing the current recovery pathname setting;
1297  *                      return code is the size in bytes of the string
1298  *      On error:       return code is zero or a negative errno value
1299  */
1300 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1301 {
1302         ssize_t rv;
1303
1304         mutex_lock(&nfsd_mutex);
1305         rv = __write_recoverydir(file, buf, size);
1306         mutex_unlock(&nfsd_mutex);
1307         return rv;
1308 }
1309
1310 #endif
1311
1312 /*----------------------------------------------------------------------------*/
1313 /*
1314  *      populating the filesystem.
1315  */
1316
1317 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1318 {
1319         static struct tree_descr nfsd_files[] = {
1320                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1321                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1322                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1323                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1324                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1325                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1326                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1327                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1328                 [NFSD_Export_features] = {"export_features",
1329                                         &export_features_operations, S_IRUGO},
1330                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1331                                         &transaction_ops, S_IWUSR|S_IRUSR},
1332                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1333                                         &transaction_ops, S_IWUSR|S_IRUSR},
1334                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1335                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1336                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1337                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1338                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1339                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1340                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1341 #ifdef CONFIG_NFSD_V4
1342                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1343                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1344 #endif
1345                 /* last one */ {""}
1346         };
1347         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1348 }
1349
1350 static int nfsd_get_sb(struct file_system_type *fs_type,
1351         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1352 {
1353         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1354 }
1355
1356 static struct file_system_type nfsd_fs_type = {
1357         .owner          = THIS_MODULE,
1358         .name           = "nfsd",
1359         .get_sb         = nfsd_get_sb,
1360         .kill_sb        = kill_litter_super,
1361 };
1362
1363 #ifdef CONFIG_PROC_FS
1364 static int create_proc_exports_entry(void)
1365 {
1366         struct proc_dir_entry *entry;
1367
1368         entry = proc_mkdir("fs/nfs", NULL);
1369         if (!entry)
1370                 return -ENOMEM;
1371         entry = proc_create("exports", 0, entry, &exports_operations);
1372         if (!entry)
1373                 return -ENOMEM;
1374         return 0;
1375 }
1376 #else /* CONFIG_PROC_FS */
1377 static int create_proc_exports_entry(void)
1378 {
1379         return 0;
1380 }
1381 #endif
1382
1383 static int __init init_nfsd(void)
1384 {
1385         int retval;
1386         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1387
1388         retval = nfs4_state_init(); /* nfs4 locking state */
1389         if (retval)
1390                 return retval;
1391         nfsd_stat_init();       /* Statistics */
1392         retval = nfsd_reply_cache_init();
1393         if (retval)
1394                 goto out_free_stat;
1395         retval = nfsd_export_init();
1396         if (retval)
1397                 goto out_free_cache;
1398         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1399         retval = nfsd_idmap_init();
1400         if (retval)
1401                 goto out_free_lockd;
1402         retval = create_proc_exports_entry();
1403         if (retval)
1404                 goto out_free_idmap;
1405         retval = register_filesystem(&nfsd_fs_type);
1406         if (retval)
1407                 goto out_free_all;
1408         return 0;
1409 out_free_all:
1410         remove_proc_entry("fs/nfs/exports", NULL);
1411         remove_proc_entry("fs/nfs", NULL);
1412 out_free_idmap:
1413         nfsd_idmap_shutdown();
1414 out_free_lockd:
1415         nfsd_lockd_shutdown();
1416         nfsd_export_shutdown();
1417 out_free_cache:
1418         nfsd_reply_cache_shutdown();
1419 out_free_stat:
1420         nfsd_stat_shutdown();
1421         nfsd4_free_slabs();
1422         return retval;
1423 }
1424
1425 static void __exit exit_nfsd(void)
1426 {
1427         nfsd_export_shutdown();
1428         nfsd_reply_cache_shutdown();
1429         remove_proc_entry("fs/nfs/exports", NULL);
1430         remove_proc_entry("fs/nfs", NULL);
1431         nfsd_stat_shutdown();
1432         nfsd_lockd_shutdown();
1433         nfsd_idmap_shutdown();
1434         nfsd4_free_slabs();
1435         unregister_filesystem(&nfsd_fs_type);
1436 }
1437
1438 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1439 MODULE_LICENSE("GPL");
1440 module_init(init_nfsd)
1441 module_exit(exit_nfsd)