fs/nfsd/nfsctl.c

   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/module.h>
  10
  11 #include <linux/linkage.h>
  12 #include <linux/time.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/namei.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/net.h>
  18 #include <linux/in.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/unistd.h>
  21 #include <linux/slab.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/init.h>
  26 #include <linux/inet.h>
  27 #include <linux/string.h>
  28 #include <linux/ctype.h>
  29
  30 #include <linux/nfs.h>
  31 #include <linux/nfsd_idmap.h>
  32 #include <linux/lockd/bind.h>
  33 #include <linux/sunrpc/svc.h>
  34 #include <linux/sunrpc/svcsock.h>
  35 #include <linux/nfsd/nfsd.h>
  36 #include <linux/nfsd/cache.h>
  37 #include <linux/nfsd/xdr.h>
  38 #include <linux/nfsd/syscall.h>
  39 #include <linux/lockd/lockd.h>
  40 #include <linux/sunrpc/clnt.h>
  41
  42 #include <asm/uaccess.h>
  43 #include <net/ipv6.h>
  44
  45 /*
  46  *      We have a single directory with 9 nodes in it.
  47  */
  48 enum {
  49         NFSD_Root = 1,
  50         NFSD_Svc,
  51         NFSD_Add,
  52         NFSD_Del,
  53         NFSD_Export,
  54         NFSD_Unexport,
  55         NFSD_Getfd,
  56         NFSD_Getfs,
  57         NFSD_List,
  58         NFSD_Fh,
  59         NFSD_FO_UnlockIP,
  60         NFSD_FO_UnlockFS,
  61         NFSD_Threads,
  62         NFSD_Pool_Threads,
  63         NFSD_Pool_Stats,
  64         NFSD_Versions,
  65         NFSD_Ports,
  66         NFSD_MaxBlkSize,
  67         /*
  68          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  69          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  70          */
  71 #ifdef CONFIG_NFSD_V4
  72         NFSD_Leasetime,
  73         NFSD_RecoveryDir,
  74 #endif
  75 };
  76
  77 /*
  78  * write() for these nodes.
  79  */
  80 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  81 static ssize_t write_add(struct file *file, char *buf, size_t size);
  82 static ssize_t write_del(struct file *file, char *buf, size_t size);
  83 static ssize_t write_export(struct file *file, char *buf, size_t size);
  84 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  85 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  86 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  87 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  88 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  89 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  90 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  91 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  92 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  93 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  94 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  95 #ifdef CONFIG_NFSD_V4
  96 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  97 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  98 #endif
  99
 100 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 101         [NFSD_Svc] = write_svc,
 102         [NFSD_Add] = write_add,
 103         [NFSD_Del] = write_del,
 104         [NFSD_Export] = write_export,
 105         [NFSD_Unexport] = write_unexport,
 106         [NFSD_Getfd] = write_getfd,
 107         [NFSD_Getfs] = write_getfs,
 108         [NFSD_Fh] = write_filehandle,
 109         [NFSD_FO_UnlockIP] = write_unlock_ip,
 110         [NFSD_FO_UnlockFS] = write_unlock_fs,
 111         [NFSD_Threads] = write_threads,
 112         [NFSD_Pool_Threads] = write_pool_threads,
 113         [NFSD_Versions] = write_versions,
 114         [NFSD_Ports] = write_ports,
 115         [NFSD_MaxBlkSize] = write_maxblksize,
 116 #ifdef CONFIG_NFSD_V4
 117         [NFSD_Leasetime] = write_leasetime,
 118         [NFSD_RecoveryDir] = write_recoverydir,
 119 #endif
 120 };
 121
 122 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 123 {
 124         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 125         char *data;
 126         ssize_t rv;
 127
 128         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 129                 return -EINVAL;
 130
 131         data = simple_transaction_get(file, buf, size);
 132         if (IS_ERR(data))
 133                 return PTR_ERR(data);
 134
 135         rv =  write_op[ino](file, data, size);
 136         if (rv >= 0) {
 137                 simple_transaction_set(file, rv);
 138                 rv = size;
 139         }
 140         return rv;
 141 }
 142
 143 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 144 {
 145         if (! file->private_data) {
 146                 /* An attempt to read a transaction file without writing
 147                  * causes a 0-byte write so that the file can return
 148                  * state information
 149                  */
 150                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 151                 if (rv < 0)
 152                         return rv;
 153         }
 154         return simple_transaction_read(file, buf, size, pos);
 155 }
 156
 157 static const struct file_operations transaction_ops = {
 158         .write          = nfsctl_transaction_write,
 159         .read           = nfsctl_transaction_read,
 160         .release        = simple_transaction_release,
 161 };
 162
 163 static int exports_open(struct inode *inode, struct file *file)
 164 {
 165         return seq_open(file, &nfs_exports_op);
 166 }
 167
 168 static const struct file_operations exports_operations = {
 169         .open           = exports_open,
 170         .read           = seq_read,
 171         .llseek         = seq_lseek,
 172         .release        = seq_release,
 173         .owner          = THIS_MODULE,
 174 };
 175
 176 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 177 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 178
 179 static const struct file_operations pool_stats_operations = {
 180         .open           = nfsd_pool_stats_open,
 181         .read           = seq_read,
 182         .llseek         = seq_lseek,
 183         .release        = nfsd_pool_stats_release,
 184         .owner          = THIS_MODULE,
 185 };
 186
 187 /*----------------------------------------------------------------------------*/
 188 /*
 189  * payload - write methods
 190  */
 191
 192 /**
 193  * write_svc - Start kernel's NFSD server
 194  *
 195  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 196  * Function remains to support old versions of nfs-utils.
 197  *
 198  * Input:
 199  *                      buf:    struct nfsctl_svc
 200  *                              svc_port:       port number of this
 201  *                                              server's listener
 202  *                              svc_nthreads:   number of threads to start
 203  *                      size:   size in bytes of passed in nfsctl_svc
 204  * Output:
 205  *      On success:     returns zero
 206  *      On error:       return code is negative errno value
 207  */
 208 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 209 {
 210         struct nfsctl_svc *data;
 211         int err;
 212         if (size < sizeof(*data))
 213                 return -EINVAL;
 214         data = (struct nfsctl_svc*) buf;
 215         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 216         if (err < 0)
 217                 return err;
 218         return 0;
 219 }
 220
 221 /**
 222  * write_add - Add or modify client entry in auth unix cache
 223  *
 224  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 225  * Function remains to support old versions of nfs-utils.
 226  *
 227  * Input:
 228  *                      buf:    struct nfsctl_client
 229  *                              cl_ident:       '\0'-terminated C string
 230  *                                              containing domain name
 231  *                                              of client
 232  *                              cl_naddr:       no. of items in cl_addrlist
 233  *                              cl_addrlist:    array of client addresses
 234  *                              cl_fhkeytype:   ignored
 235  *                              cl_fhkeylen:    ignored
 236  *                              cl_fhkey:       ignored
 237  *                      size:   size in bytes of passed in nfsctl_client
 238  * Output:
 239  *      On success:     returns zero
 240  *      On error:       return code is negative errno value
 241  *
 242  * Note: Only AF_INET client addresses are passed in, since
 243  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 244  */
 245 static ssize_t write_add(struct file *file, char *buf, size_t size)
 246 {
 247         struct nfsctl_client *data;
 248         if (size < sizeof(*data))
 249                 return -EINVAL;
 250         data = (struct nfsctl_client *)buf;
 251         return exp_addclient(data);
 252 }
 253
 254 /**
 255  * write_del - Remove client from auth unix cache
 256  *
 257  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 258  * Function remains to support old versions of nfs-utils.
 259  *
 260  * Input:
 261  *                      buf:    struct nfsctl_client
 262  *                              cl_ident:       '\0'-terminated C string
 263  *                                              containing domain name
 264  *                                              of client
 265  *                              cl_naddr:       ignored
 266  *                              cl_addrlist:    ignored
 267  *                              cl_fhkeytype:   ignored
 268  *                              cl_fhkeylen:    ignored
 269  *                              cl_fhkey:       ignored
 270  *                      size:   size in bytes of passed in nfsctl_client
 271  * Output:
 272  *      On success:     returns zero
 273  *      On error:       return code is negative errno value
 274  *
 275  * Note: Only AF_INET client addresses are passed in, since
 276  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 277  */
 278 static ssize_t write_del(struct file *file, char *buf, size_t size)
 279 {
 280         struct nfsctl_client *data;
 281         if (size < sizeof(*data))
 282                 return -EINVAL;
 283         data = (struct nfsctl_client *)buf;
 284         return exp_delclient(data);
 285 }
 286
 287 /**
 288  * write_export - Export part or all of a local file system
 289  *
 290  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 291  * Function remains to support old versions of nfs-utils.
 292  *
 293  * Input:
 294  *                      buf:    struct nfsctl_export
 295  *                              ex_client:      '\0'-terminated C string
 296  *                                              containing domain name
 297  *                                              of client allowed to access
 298  *                                              this export
 299  *                              ex_path:        '\0'-terminated C string
 300  *                                              containing pathname of
 301  *                                              directory in local file system
 302  *                              ex_dev:         fsid to use for this export
 303  *                              ex_ino:         ignored
 304  *                              ex_flags:       export flags for this export
 305  *                              ex_anon_uid:    UID to use for anonymous
 306  *                                              requests
 307  *                              ex_anon_gid:    GID to use for anonymous
 308  *                                              requests
 309  *                      size:   size in bytes of passed in nfsctl_export
 310  * Output:
 311  *      On success:     returns zero
 312  *      On error:       return code is negative errno value
 313  */
 314 static ssize_t write_export(struct file *file, char *buf, size_t size)
 315 {
 316         struct nfsctl_export *data;
 317         if (size < sizeof(*data))
 318                 return -EINVAL;
 319         data = (struct nfsctl_export*)buf;
 320         return exp_export(data);
 321 }
 322
 323 /**
 324  * write_unexport - Unexport a previously exported file system
 325  *
 326  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 327  * Function remains to support old versions of nfs-utils.
 328  *
 329  * Input:
 330  *                      buf:    struct nfsctl_export
 331  *                              ex_client:      '\0'-terminated C string
 332  *                                              containing domain name
 333  *                                              of client no longer allowed
 334  *                                              to access this export
 335  *                              ex_path:        '\0'-terminated C string
 336  *                                              containing pathname of
 337  *                                              directory in local file system
 338  *                              ex_dev:         ignored
 339  *                              ex_ino:         ignored
 340  *                              ex_flags:       ignored
 341  *                              ex_anon_uid:    ignored
 342  *                              ex_anon_gid:    ignored
 343  *                      size:   size in bytes of passed in nfsctl_export
 344  * Output:
 345  *      On success:     returns zero
 346  *      On error:       return code is negative errno value
 347  */
 348 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 349 {
 350         struct nfsctl_export *data;
 351
 352         if (size < sizeof(*data))
 353                 return -EINVAL;
 354         data = (struct nfsctl_export*)buf;
 355         return exp_unexport(data);
 356 }
 357
 358 /**
 359  * write_getfs - Get a variable-length NFS file handle by path
 360  *
 361  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 362  * Function remains to support old versions of nfs-utils.
 363  *
 364  * Input:
 365  *                      buf:    struct nfsctl_fsparm
 366  *                              gd_addr:        socket address of client
 367  *                              gd_path:        '\0'-terminated C string
 368  *                                              containing pathname of
 369  *                                              directory in local file system
 370  *                              gd_maxlen:      maximum size of returned file
 371  *                                              handle
 372  *                      size:   size in bytes of passed in nfsctl_fsparm
 373  * Output:
 374  *      On success:     passed-in buffer filled with a knfsd_fh structure
 375  *                      (a variable-length raw NFS file handle);
 376  *                      return code is the size in bytes of the file handle
 377  *      On error:       return code is negative errno value
 378  *
 379  * Note: Only AF_INET client addresses are passed in, since gd_addr
 380  * is the same size as a struct sockaddr_in.
 381  */
 382 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 383 {
 384         struct nfsctl_fsparm *data;
 385         struct sockaddr_in *sin;
 386         struct auth_domain *clp;
 387         int err = 0;
 388         struct knfsd_fh *res;
 389         struct in6_addr in6;
 390
 391         if (size < sizeof(*data))
 392                 return -EINVAL;
 393         data = (struct nfsctl_fsparm*)buf;
 394         err = -EPROTONOSUPPORT;
 395         if (data->gd_addr.sa_family != AF_INET)
 396                 goto out;
 397         sin = (struct sockaddr_in *)&data->gd_addr;
 398         if (data->gd_maxlen > NFS3_FHSIZE)
 399                 data->gd_maxlen = NFS3_FHSIZE;
 400
 401         res = (struct knfsd_fh*)buf;
 402
 403         exp_readlock();
 404
 405         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 406
 407         clp = auth_unix_lookup(&in6);
 408         if (!clp)
 409                 err = -EPERM;
 410         else {
 411                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 412                 auth_domain_put(clp);
 413         }
 414         exp_readunlock();
 415         if (err == 0)
 416                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 417  out:
 418         return err;
 419 }
 420
 421 /**
 422  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 423  *
 424  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 425  * Function remains to support old versions of nfs-utils.
 426  *
 427  * Input:
 428  *                      buf:    struct nfsctl_fdparm
 429  *                              gd_addr:        socket address of client
 430  *                              gd_path:        '\0'-terminated C string
 431  *                                              containing pathname of
 432  *                                              directory in local file system
 433  *                              gd_version:     fdparm structure version
 434  *                      size:   size in bytes of passed in nfsctl_fdparm
 435  * Output:
 436  *      On success:     passed-in buffer filled with nfsctl_res
 437  *                      (a fixed-length raw NFS file handle);
 438  *                      return code is the size in bytes of the file handle
 439  *      On error:       return code is negative errno value
 440  *
 441  * Note: Only AF_INET client addresses are passed in, since gd_addr
 442  * is the same size as a struct sockaddr_in.
 443  */
 444 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 445 {
 446         struct nfsctl_fdparm *data;
 447         struct sockaddr_in *sin;
 448         struct auth_domain *clp;
 449         int err = 0;
 450         struct knfsd_fh fh;
 451         char *res;
 452         struct in6_addr in6;
 453
 454         if (size < sizeof(*data))
 455                 return -EINVAL;
 456         data = (struct nfsctl_fdparm*)buf;
 457         err = -EPROTONOSUPPORT;
 458         if (data->gd_addr.sa_family != AF_INET)
 459                 goto out;
 460         err = -EINVAL;
 461         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 462                 goto out;
 463
 464         res = buf;
 465         sin = (struct sockaddr_in *)&data->gd_addr;
 466         exp_readlock();
 467
 468         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 469
 470         clp = auth_unix_lookup(&in6);
 471         if (!clp)
 472                 err = -EPERM;
 473         else {
 474                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 475                 auth_domain_put(clp);
 476         }
 477         exp_readunlock();
 478
 479         if (err == 0) {
 480                 memset(res,0, NFS_FHSIZE);
 481                 memcpy(res, &fh.fh_base, fh.fh_size);
 482                 err = NFS_FHSIZE;
 483         }
 484  out:
 485         return err;
 486 }
 487
 488 /**
 489  * write_unlock_ip - Release all locks used by a client
 490  *
 491  * Experimental.
 492  *
 493  * Input:
 494  *                      buf:    '\n'-terminated C string containing a
 495  *                              presentation format IP address
 496  *                      size:   length of C string in @buf
 497  * Output:
 498  *      On success:     returns zero if all specified locks were released;
 499  *                      returns one if one or more locks were not released
 500  *      On error:       return code is negative errno value
 501  */
 502 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 503 {
 504         struct sockaddr_storage address;
 505         struct sockaddr *sap = (struct sockaddr *)&address;
 506         size_t salen = sizeof(address);
 507         char *fo_path;
 508
 509         /* sanity check */
 510         if (size == 0)
 511                 return -EINVAL;
 512
 513         if (buf[size-1] != '\n')
 514                 return -EINVAL;
 515
 516         fo_path = buf;
 517         if (qword_get(&buf, fo_path, size) < 0)
 518                 return -EINVAL;
 519
 520         if (rpc_pton(fo_path, size, sap, salen) == 0)
 521                 return -EINVAL;
 522
 523         return nlmsvc_unlock_all_by_ip(sap);
 524 }
 525
 526 /**
 527  * write_unlock_fs - Release all locks on a local file system
 528  *
 529  * Experimental.
 530  *
 531  * Input:
 532  *                      buf:    '\n'-terminated C string containing the
 533  *                              absolute pathname of a local file system
 534  *                      size:   length of C string in @buf
 535  * Output:
 536  *      On success:     returns zero if all specified locks were released;
 537  *                      returns one if one or more locks were not released
 538  *      On error:       return code is negative errno value
 539  */
 540 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 541 {
 542         struct path path;
 543         char *fo_path;
 544         int error;
 545
 546         /* sanity check */
 547         if (size == 0)
 548                 return -EINVAL;
 549
 550         if (buf[size-1] != '\n')
 551                 return -EINVAL;
 552
 553         fo_path = buf;
 554         if (qword_get(&buf, fo_path, size) < 0)
 555                 return -EINVAL;
 556
 557         error = kern_path(fo_path, 0, &path);
 558         if (error)
 559                 return error;
 560
 561         /*
 562          * XXX: Needs better sanity checking.  Otherwise we could end up
 563          * releasing locks on the wrong file system.
 564          *
 565          * For example:
 566          * 1.  Does the path refer to a directory?
 567          * 2.  Is that directory a mount point, or
 568          * 3.  Is that directory the root of an exported file system?
 569          */
 570         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 571
 572         path_put(&path);
 573         return error;
 574 }
 575
 576 /**
 577  * write_filehandle - Get a variable-length NFS file handle by path
 578  *
 579  * On input, the buffer contains a '\n'-terminated C string comprised of
 580  * three alphanumeric words separated by whitespace.  The string may
 581  * contain escape sequences.
 582  *
 583  * Input:
 584  *                      buf:
 585  *                              domain:         client domain name
 586  *                              path:           export pathname
 587  *                              maxsize:        numeric maximum size of
 588  *                                              @buf
 589  *                      size:   length of C string in @buf
 590  * Output:
 591  *      On success:     passed-in buffer filled with '\n'-terminated C
 592  *                      string containing a ASCII hex text version
 593  *                      of the NFS file handle;
 594  *                      return code is the size in bytes of the string
 595  *      On error:       return code is negative errno value
 596  */
 597 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 598 {
 599         char *dname, *path;
 600         int uninitialized_var(maxsize);
 601         char *mesg = buf;
 602         int len;
 603         struct auth_domain *dom;
 604         struct knfsd_fh fh;
 605
 606         if (size == 0)
 607                 return -EINVAL;
 608
 609         if (buf[size-1] != '\n')
 610                 return -EINVAL;
 611         buf[size-1] = 0;
 612
 613         dname = mesg;
 614         len = qword_get(&mesg, dname, size);
 615         if (len <= 0)
 616                 return -EINVAL;
 617
 618         path = dname+len+1;
 619         len = qword_get(&mesg, path, size);
 620         if (len <= 0)
 621                 return -EINVAL;
 622
 623         len = get_int(&mesg, &maxsize);
 624         if (len)
 625                 return len;
 626
 627         if (maxsize < NFS_FHSIZE)
 628                 return -EINVAL;
 629         if (maxsize > NFS3_FHSIZE)
 630                 maxsize = NFS3_FHSIZE;
 631
 632         if (qword_get(&mesg, mesg, size)>0)
 633                 return -EINVAL;
 634
 635         /* we have all the words, they are in buf.. */
 636         dom = unix_domain_find(dname);
 637         if (!dom)
 638                 return -ENOMEM;
 639
 640         len = exp_rootfh(dom, path, &fh,  maxsize);
 641         auth_domain_put(dom);
 642         if (len)
 643                 return len;
 644
 645         mesg = buf;
 646         len = SIMPLE_TRANSACTION_LIMIT;
 647         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 648         mesg[-1] = '\n';
 649         return mesg - buf;
 650 }
 651
 652 /**
 653  * write_threads - Start NFSD, or report the current number of running threads
 654  *
 655  * Input:
 656  *                      buf:            ignored
 657  *                      size:           zero
 658  * Output:
 659  *      On success:     passed-in buffer filled with '\n'-terminated C
 660  *                      string numeric value representing the number of
 661  *                      running NFSD threads;
 662  *                      return code is the size in bytes of the string
 663  *      On error:       return code is zero
 664  *
 665  * OR
 666  *
 667  * Input:
 668  *                      buf:            C string containing an unsigned
 669  *                                      integer value representing the
 670  *                                      number of NFSD threads to start
 671  *                      size:           non-zero length of C string in @buf
 672  * Output:
 673  *      On success:     NFS service is started;
 674  *                      passed-in buffer filled with '\n'-terminated C
 675  *                      string numeric value representing the number of
 676  *                      running NFSD threads;
 677  *                      return code is the size in bytes of the string
 678  *      On error:       return code is zero or a negative errno value
 679  */
 680 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 681 {
 682         char *mesg = buf;
 683         int rv;
 684         if (size > 0) {
 685                 int newthreads;
 686                 rv = get_int(&mesg, &newthreads);
 687                 if (rv)
 688                         return rv;
 689                 if (newthreads < 0)
 690                         return -EINVAL;
 691                 rv = nfsd_svc(NFS_PORT, newthreads);
 692                 if (rv < 0)
 693                         return rv;
 694         } else
 695                 rv = nfsd_nrthreads();
 696
 697         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 698 }
 699
 700 /**
 701  * write_pool_threads - Set or report the current number of threads per pool
 702  *
 703  * Input:
 704  *                      buf:            ignored
 705  *                      size:           zero
 706  *
 707  * OR
 708  *
 709  * Input:
 710  *                      buf:            C string containing whitespace-
 711  *                                      separated unsigned integer values
 712  *                                      representing the number of NFSD
 713  *                                      threads to start in each pool
 714  *                      size:           non-zero length of C string in @buf
 715  * Output:
 716  *      On success:     passed-in buffer filled with '\n'-terminated C
 717  *                      string containing integer values representing the
 718  *                      number of NFSD threads in each pool;
 719  *                      return code is the size in bytes of the string
 720  *      On error:       return code is zero or a negative errno value
 721  */
 722 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 723 {
 724         /* if size > 0, look for an array of number of threads per node
 725          * and apply them  then write out number of threads per node as reply
 726          */
 727         char *mesg = buf;
 728         int i;
 729         int rv;
 730         int len;
 731         int npools;
 732         int *nthreads;
 733
 734         mutex_lock(&nfsd_mutex);
 735         npools = nfsd_nrpools();
 736         if (npools == 0) {
 737                 /*
 738                  * NFS is shut down.  The admin can start it by
 739                  * writing to the threads file but NOT the pool_threads
 740                  * file, sorry.  Report zero threads.
 741                  */
 742                 mutex_unlock(&nfsd_mutex);
 743                 strcpy(buf, "0\n");
 744                 return strlen(buf);
 745         }
 746
 747         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 748         rv = -ENOMEM;
 749         if (nthreads == NULL)
 750                 goto out_free;
 751
 752         if (size > 0) {
 753                 for (i = 0; i < npools; i++) {
 754                         rv = get_int(&mesg, &nthreads[i]);
 755                         if (rv == -ENOENT)
 756                                 break;          /* fewer numbers than pools */
 757                         if (rv)
 758                                 goto out_free;  /* syntax error */
 759                         rv = -EINVAL;
 760                         if (nthreads[i] < 0)
 761                                 goto out_free;
 762                 }
 763                 rv = nfsd_set_nrthreads(i, nthreads);
 764                 if (rv)
 765                         goto out_free;
 766         }
 767
 768         rv = nfsd_get_nrthreads(npools, nthreads);
 769         if (rv)
 770                 goto out_free;
 771
 772         mesg = buf;
 773         size = SIMPLE_TRANSACTION_LIMIT;
 774         for (i = 0; i < npools && size > 0; i++) {
 775                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 776                 len = strlen(mesg);
 777                 size -= len;
 778                 mesg += len;
 779         }
 780         rv = mesg - buf;
 781 out_free:
 782         kfree(nthreads);
 783         mutex_unlock(&nfsd_mutex);
 784         return rv;
 785 }
 786
 787 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 788 {
 789         char *mesg = buf;
 790         char *vers, *minorp, sign;
 791         int len, num, remaining;
 792         unsigned minor;
 793         ssize_t tlen = 0;
 794         char *sep;
 795
 796         if (size>0) {
 797                 if (nfsd_serv)
 798                         /* Cannot change versions without updating
 799                          * nfsd_serv->sv_xdrsize, and reallocing
 800                          * rq_argp and rq_resp
 801                          */
 802                         return -EBUSY;
 803                 if (buf[size-1] != '\n')
 804                         return -EINVAL;
 805                 buf[size-1] = 0;
 806
 807                 vers = mesg;
 808                 len = qword_get(&mesg, vers, size);
 809                 if (len <= 0) return -EINVAL;
 810                 do {
 811                         sign = *vers;
 812                         if (sign == '+' || sign == '-')
 813                                 num = simple_strtol((vers+1), &minorp, 0);
 814                         else
 815                                 num = simple_strtol(vers, &minorp, 0);
 816                         if (*minorp == '.') {
 817                                 if (num < 4)
 818                                         return -EINVAL;
 819                                 minor = simple_strtoul(minorp+1, NULL, 0);
 820                                 if (minor == 0)
 821                                         return -EINVAL;
 822                                 if (nfsd_minorversion(minor, sign == '-' ?
 823                                                      NFSD_CLEAR : NFSD_SET) < 0)
 824                                         return -EINVAL;
 825                                 goto next;
 826                         }
 827                         switch(num) {
 828                         case 2:
 829                         case 3:
 830                         case 4:
 831                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 832                                 break;
 833                         default:
 834                                 return -EINVAL;
 835                         }
 836                 next:
 837                         vers += len + 1;
 838                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 839                 /* If all get turned off, turn them back on, as
 840                  * having no versions is BAD
 841                  */
 842                 nfsd_reset_versions();
 843         }
 844
 845         /* Now write current state into reply buffer */
 846         len = 0;
 847         sep = "";
 848         remaining = SIMPLE_TRANSACTION_LIMIT;
 849         for (num=2 ; num <= 4 ; num++)
 850                 if (nfsd_vers(num, NFSD_AVAIL)) {
 851                         len = snprintf(buf, remaining, "%s%c%d", sep,
 852                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 853                                        num);
 854                         sep = " ";
 855
 856                         if (len > remaining)
 857                                 break;
 858                         remaining -= len;
 859                         buf += len;
 860                         tlen += len;
 861                 }
 862         if (nfsd_vers(4, NFSD_AVAIL))
 863                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 864                      minor++) {
 865                         len = snprintf(buf, remaining, " %c4.%u",
 866                                         (nfsd_vers(4, NFSD_TEST) &&
 867                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 868                                                 '+' : '-',
 869                                         minor);
 870
 871                         if (len > remaining)
 872                                 break;
 873                         remaining -= len;
 874                         buf += len;
 875                         tlen += len;
 876                 }
 877
 878         len = snprintf(buf, remaining, "\n");
 879         if (len > remaining)
 880                 return -EINVAL;
 881         return tlen + len;
 882 }
 883
 884 /**
 885  * write_versions - Set or report the available NFS protocol versions
 886  *
 887  * Input:
 888  *                      buf:            ignored
 889  *                      size:           zero
 890  * Output:
 891  *      On success:     passed-in buffer filled with '\n'-terminated C
 892  *                      string containing positive or negative integer
 893  *                      values representing the current status of each
 894  *                      protocol version;
 895  *                      return code is the size in bytes of the string
 896  *      On error:       return code is zero or a negative errno value
 897  *
 898  * OR
 899  *
 900  * Input:
 901  *                      buf:            C string containing whitespace-
 902  *                                      separated positive or negative
 903  *                                      integer values representing NFS
 904  *                                      protocol versions to enable ("+n")
 905  *                                      or disable ("-n")
 906  *                      size:           non-zero length of C string in @buf
 907  * Output:
 908  *      On success:     status of zero or more protocol versions has
 909  *                      been updated; passed-in buffer filled with
 910  *                      '\n'-terminated C string containing positive
 911  *                      or negative integer values representing the
 912  *                      current status of each protocol version;
 913  *                      return code is the size in bytes of the string
 914  *      On error:       return code is zero or a negative errno value
 915  */
 916 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 917 {
 918         ssize_t rv;
 919
 920         mutex_lock(&nfsd_mutex);
 921         rv = __write_versions(file, buf, size);
 922         mutex_unlock(&nfsd_mutex);
 923         return rv;
 924 }
 925
 926 /*
 927  * Zero-length write.  Return a list of NFSD's current listener
 928  * transports.
 929  */
 930 static ssize_t __write_ports_names(char *buf)
 931 {
 932         if (nfsd_serv == NULL)
 933                 return 0;
 934         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 935 }
 936
 937 /*
 938  * A single 'fd' number was written, in which case it must be for
 939  * a socket of a supported family/protocol, and we use it as an
 940  * nfsd listener.
 941  */
 942 static ssize_t __write_ports_addfd(char *buf)
 943 {
 944         char *mesg = buf;
 945         int fd, err;
 946
 947         err = get_int(&mesg, &fd);
 948         if (err != 0 || fd < 0)
 949                 return -EINVAL;
 950
 951         err = nfsd_create_serv();
 952         if (err != 0)
 953                 return err;
 954
 955         err = lockd_up();
 956         if (err != 0)
 957                 goto out;
 958
 959         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 960         if (err < 0)
 961                 lockd_down();
 962
 963 out:
 964         /* Decrease the count, but don't shut down the service */
 965         nfsd_serv->sv_nrthreads--;
 966         return err;
 967 }
 968
 969 /*
 970  * A '-' followed by the 'name' of a socket means we close the socket.
 971  */
 972 static ssize_t __write_ports_delfd(char *buf)
 973 {
 974         char *toclose;
 975         int len = 0;
 976
 977         toclose = kstrdup(buf + 1, GFP_KERNEL);
 978         if (toclose == NULL)
 979                 return -ENOMEM;
 980
 981         if (nfsd_serv != NULL)
 982                 len = svc_sock_names(nfsd_serv, buf,
 983                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 984         if (len >= 0)
 985                 lockd_down();
 986
 987         kfree(toclose);
 988         return len;
 989 }
 990
 991 /*
 992  * A transport listener is added by writing it's transport name and
 993  * a port number.
 994  */
 995 static ssize_t __write_ports_addxprt(char *buf)
 996 {
 997         char transport[16];
 998         int port, err;
 999
1000         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1001                 return -EINVAL;
1002
1003         if (port < 1 || port > USHORT_MAX)
1004                 return -EINVAL;
1005
1006         err = nfsd_create_serv();
1007         if (err != 0)
1008                 return err;
1009
1010         err = svc_create_xprt(nfsd_serv, transport,
1011                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1012         if (err < 0) {
1013                 /* Give a reasonable perror msg for bad transport string */
1014                 if (err == -ENOENT)
1015                         err = -EPROTONOSUPPORT;
1016                 return err;
1017         }
1018         return 0;
1019 }
1020
1021 /*
1022  * A transport listener is removed by writing a "-", it's transport
1023  * name, and it's port number.
1024  */
1025 static ssize_t __write_ports_delxprt(char *buf)
1026 {
1027         struct svc_xprt *xprt;
1028         char transport[16];
1029         int port;
1030
1031         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1032                 return -EINVAL;
1033
1034         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1035                 return -EINVAL;
1036
1037         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1038         if (xprt == NULL)
1039                 return -ENOTCONN;
1040
1041         svc_close_xprt(xprt);
1042         svc_xprt_put(xprt);
1043         return 0;
1044 }
1045
1046 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1047 {
1048         if (size == 0)
1049                 return __write_ports_names(buf);
1050
1051         if (isdigit(buf[0]))
1052                 return __write_ports_addfd(buf);
1053
1054         if (buf[0] == '-' && isdigit(buf[1]))
1055                 return __write_ports_delfd(buf);
1056
1057         if (isalpha(buf[0]))
1058                 return __write_ports_addxprt(buf);
1059
1060         if (buf[0] == '-' && isalpha(buf[1]))
1061                 return __write_ports_delxprt(buf);
1062
1063         return -EINVAL;
1064 }
1065
1066 /**
1067  * write_ports - Pass a socket file descriptor or transport name to listen on
1068  *
1069  * Input:
1070  *                      buf:            ignored
1071  *                      size:           zero
1072  * Output:
1073  *      On success:     passed-in buffer filled with a '\n'-terminated C
1074  *                      string containing a whitespace-separated list of
1075  *                      named NFSD listeners;
1076  *                      return code is the size in bytes of the string
1077  *      On error:       return code is zero or a negative errno value
1078  *
1079  * OR
1080  *
1081  * Input:
1082  *                      buf:            C string containing an unsigned
1083  *                                      integer value representing a bound
1084  *                                      but unconnected socket that is to be
1085  *                                      used as an NFSD listener; listen(3)
1086  *                                      must be called for a SOCK_STREAM
1087  *                                      socket, otherwise it is ignored
1088  *                      size:           non-zero length of C string in @buf
1089  * Output:
1090  *      On success:     NFS service is started;
1091  *                      passed-in buffer filled with a '\n'-terminated C
1092  *                      string containing a unique alphanumeric name of
1093  *                      the listener;
1094  *                      return code is the size in bytes of the string
1095  *      On error:       return code is a negative errno value
1096  *
1097  * OR
1098  *
1099  * Input:
1100  *                      buf:            C string containing a "-" followed
1101  *                                      by an integer value representing a
1102  *                                      previously passed in socket file
1103  *                                      descriptor
1104  *                      size:           non-zero length of C string in @buf
1105  * Output:
1106  *      On success:     NFS service no longer listens on that socket;
1107  *                      passed-in buffer filled with a '\n'-terminated C
1108  *                      string containing a unique name of the listener;
1109  *                      return code is the size in bytes of the string
1110  *      On error:       return code is a negative errno value
1111  *
1112  * OR
1113  *
1114  * Input:
1115  *                      buf:            C string containing a transport
1116  *                                      name and an unsigned integer value
1117  *                                      representing the port to listen on,
1118  *                                      separated by whitespace
1119  *                      size:           non-zero length of C string in @buf
1120  * Output:
1121  *      On success:     returns zero; NFS service is started
1122  *      On error:       return code is a negative errno value
1123  *
1124  * OR
1125  *
1126  * Input:
1127  *                      buf:            C string containing a "-" followed
1128  *                                      by a transport name and an unsigned
1129  *                                      integer value representing the port
1130  *                                      to listen on, separated by whitespace
1131  *                      size:           non-zero length of C string in @buf
1132  * Output:
1133  *      On success:     returns zero; NFS service no longer listens
1134  *                      on that transport
1135  *      On error:       return code is a negative errno value
1136  */
1137 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1138 {
1139         ssize_t rv;
1140
1141         mutex_lock(&nfsd_mutex);
1142         rv = __write_ports(file, buf, size);
1143         mutex_unlock(&nfsd_mutex);
1144         return rv;
1145 }
1146
1147
1148 int nfsd_max_blksize;
1149
1150 /**
1151  * write_maxblksize - Set or report the current NFS blksize
1152  *
1153  * Input:
1154  *                      buf:            ignored
1155  *                      size:           zero
1156  *
1157  * OR
1158  *
1159  * Input:
1160  *                      buf:            C string containing an unsigned
1161  *                                      integer value representing the new
1162  *                                      NFS blksize
1163  *                      size:           non-zero length of C string in @buf
1164  * Output:
1165  *      On success:     passed-in buffer filled with '\n'-terminated C string
1166  *                      containing numeric value of the current NFS blksize
1167  *                      setting;
1168  *                      return code is the size in bytes of the string
1169  *      On error:       return code is zero or a negative errno value
1170  */
1171 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1172 {
1173         char *mesg = buf;
1174         if (size > 0) {
1175                 int bsize;
1176                 int rv = get_int(&mesg, &bsize);
1177                 if (rv)
1178                         return rv;
1179                 /* force bsize into allowed range and
1180                  * required alignment.
1181                  */
1182                 if (bsize < 1024)
1183                         bsize = 1024;
1184                 if (bsize > NFSSVC_MAXBLKSIZE)
1185                         bsize = NFSSVC_MAXBLKSIZE;
1186                 bsize &= ~(1024-1);
1187                 mutex_lock(&nfsd_mutex);
1188                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1189                         mutex_unlock(&nfsd_mutex);
1190                         return -EBUSY;
1191                 }
1192                 nfsd_max_blksize = bsize;
1193                 mutex_unlock(&nfsd_mutex);
1194         }
1195
1196         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1197                                                         nfsd_max_blksize);
1198 }
1199
1200 #ifdef CONFIG_NFSD_V4
1201 extern time_t nfs4_leasetime(void);
1202
1203 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1204 {
1205         /* if size > 10 seconds, call
1206          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1207          */
1208         char *mesg = buf;
1209         int rv, lease;
1210
1211         if (size > 0) {
1212                 if (nfsd_serv)
1213                         return -EBUSY;
1214                 rv = get_int(&mesg, &lease);
1215                 if (rv)
1216                         return rv;
1217                 if (lease < 10 || lease > 3600)
1218                         return -EINVAL;
1219                 nfs4_reset_lease(lease);
1220         }
1221
1222         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1223                                                         nfs4_lease_time());
1224 }
1225
1226 /**
1227  * write_leasetime - Set or report the current NFSv4 lease time
1228  *
1229  * Input:
1230  *                      buf:            ignored
1231  *                      size:           zero
1232  *
1233  * OR
1234  *
1235  * Input:
1236  *                      buf:            C string containing an unsigned
1237  *                                      integer value representing the new
1238  *                                      NFSv4 lease expiry time
1239  *                      size:           non-zero length of C string in @buf
1240  * Output:
1241  *      On success:     passed-in buffer filled with '\n'-terminated C
1242  *                      string containing unsigned integer value of the
1243  *                      current lease expiry time;
1244  *                      return code is the size in bytes of the string
1245  *      On error:       return code is zero or a negative errno value
1246  */
1247 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1248 {
1249         ssize_t rv;
1250
1251         mutex_lock(&nfsd_mutex);
1252         rv = __write_leasetime(file, buf, size);
1253         mutex_unlock(&nfsd_mutex);
1254         return rv;
1255 }
1256
1257 extern char *nfs4_recoverydir(void);
1258
1259 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1260 {
1261         char *mesg = buf;
1262         char *recdir;
1263         int len, status;
1264
1265         if (size > 0) {
1266                 if (nfsd_serv)
1267                         return -EBUSY;
1268                 if (size > PATH_MAX || buf[size-1] != '\n')
1269                         return -EINVAL;
1270                 buf[size-1] = 0;
1271
1272                 recdir = mesg;
1273                 len = qword_get(&mesg, recdir, size);
1274                 if (len <= 0)
1275                         return -EINVAL;
1276
1277                 status = nfs4_reset_recoverydir(recdir);
1278         }
1279
1280         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1281                                                         nfs4_recoverydir());
1282 }
1283
1284 /**
1285  * write_recoverydir - Set or report the pathname of the recovery directory
1286  *
1287  * Input:
1288  *                      buf:            ignored
1289  *                      size:           zero
1290  *
1291  * OR
1292  *
1293  * Input:
1294  *                      buf:            C string containing the pathname
1295  *                                      of the directory on a local file
1296  *                                      system containing permanent NFSv4
1297  *                                      recovery data
1298  *                      size:           non-zero length of C string in @buf
1299  * Output:
1300  *      On success:     passed-in buffer filled with '\n'-terminated C string
1301  *                      containing the current recovery pathname setting;
1302  *                      return code is the size in bytes of the string
1303  *      On error:       return code is zero or a negative errno value
1304  */
1305 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1306 {
1307         ssize_t rv;
1308
1309         mutex_lock(&nfsd_mutex);
1310         rv = __write_recoverydir(file, buf, size);
1311         mutex_unlock(&nfsd_mutex);
1312         return rv;
1313 }
1314
1315 #endif
1316
1317 /*----------------------------------------------------------------------------*/
1318 /*
1319  *      populating the filesystem.
1320  */
1321
1322 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1323 {
1324         static struct tree_descr nfsd_files[] = {
1325                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1326                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1327                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1328                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1329                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1330                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1331                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1332                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1333                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1334                                         &transaction_ops, S_IWUSR|S_IRUSR},
1335                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1336                                         &transaction_ops, S_IWUSR|S_IRUSR},
1337                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1338                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1339                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1340                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1341                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1342                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1343                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1344 #ifdef CONFIG_NFSD_V4
1345                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1346                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1347 #endif
1348                 /* last one */ {""}
1349         };
1350         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1351 }
1352
1353 static int nfsd_get_sb(struct file_system_type *fs_type,
1354         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1355 {
1356         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1357 }
1358
1359 static struct file_system_type nfsd_fs_type = {
1360         .owner          = THIS_MODULE,
1361         .name           = "nfsd",
1362         .get_sb         = nfsd_get_sb,
1363         .kill_sb        = kill_litter_super,
1364 };
1365
1366 #ifdef CONFIG_PROC_FS
1367 static int create_proc_exports_entry(void)
1368 {
1369         struct proc_dir_entry *entry;
1370
1371         entry = proc_mkdir("fs/nfs", NULL);
1372         if (!entry)
1373                 return -ENOMEM;
1374         entry = proc_create("exports", 0, entry, &exports_operations);
1375         if (!entry)
1376                 return -ENOMEM;
1377         return 0;
1378 }
1379 #else /* CONFIG_PROC_FS */
1380 static int create_proc_exports_entry(void)
1381 {
1382         return 0;
1383 }
1384 #endif
1385
1386 static int __init init_nfsd(void)
1387 {
1388         int retval;
1389         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1390
1391         retval = nfs4_state_init(); /* nfs4 locking state */
1392         if (retval)
1393                 return retval;
1394         nfsd_stat_init();       /* Statistics */
1395         retval = nfsd_reply_cache_init();
1396         if (retval)
1397                 goto out_free_stat;
1398         retval = nfsd_export_init();
1399         if (retval)
1400                 goto out_free_cache;
1401         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1402         retval = nfsd_idmap_init();
1403         if (retval)
1404                 goto out_free_lockd;
1405         retval = create_proc_exports_entry();
1406         if (retval)
1407                 goto out_free_idmap;
1408         retval = register_filesystem(&nfsd_fs_type);
1409         if (retval)
1410                 goto out_free_all;
1411         return 0;
1412 out_free_all:
1413         remove_proc_entry("fs/nfs/exports", NULL);
1414         remove_proc_entry("fs/nfs", NULL);
1415 out_free_idmap:
1416         nfsd_idmap_shutdown();
1417 out_free_lockd:
1418         nfsd_lockd_shutdown();
1419         nfsd_export_shutdown();
1420 out_free_cache:
1421         nfsd_reply_cache_shutdown();
1422 out_free_stat:
1423         nfsd_stat_shutdown();
1424         nfsd4_free_slabs();
1425         return retval;
1426 }
1427
1428 static void __exit exit_nfsd(void)
1429 {
1430         nfsd_export_shutdown();
1431         nfsd_reply_cache_shutdown();
1432         remove_proc_entry("fs/nfs/exports", NULL);
1433         remove_proc_entry("fs/nfs", NULL);
1434         nfsd_stat_shutdown();
1435         nfsd_lockd_shutdown();
1436         nfsd_idmap_shutdown();
1437         nfsd4_free_slabs();
1438         unregister_filesystem(&nfsd_fs_type);
1439 }
1440
1441 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1442 MODULE_LICENSE("GPL");
1443 module_init(init_nfsd)
1444 module_exit(exit_nfsd)