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