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   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/namei.h>
  10 #include <linux/ctype.h>
  11
  12 #include <linux/nfsd_idmap.h>
  13 #include <linux/sunrpc/svcsock.h>
  14 #include <linux/nfsd/syscall.h>
  15 #include <linux/lockd/lockd.h>
  16 #include <linux/sunrpc/clnt.h>
  17
  18 #include "nfsd.h"
  19 #include "cache.h"
  20
  21 /*
  22  *      We have a single directory with 9 nodes in it.
  23  */
  24 enum {
  25         NFSD_Root = 1,
  26         NFSD_Svc,
  27         NFSD_Add,
  28         NFSD_Del,
  29         NFSD_Export,
  30         NFSD_Unexport,
  31         NFSD_Getfd,
  32         NFSD_Getfs,
  33         NFSD_List,
  34         NFSD_Fh,
  35         NFSD_FO_UnlockIP,
  36         NFSD_FO_UnlockFS,
  37         NFSD_Threads,
  38         NFSD_Pool_Threads,
  39         NFSD_Pool_Stats,
  40         NFSD_Versions,
  41         NFSD_Ports,
  42         NFSD_MaxBlkSize,
  43         /*
  44          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  45          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  46          */
  47 #ifdef CONFIG_NFSD_V4
  48         NFSD_Leasetime,
  49         NFSD_RecoveryDir,
  50 #endif
  51 };
  52
  53 /*
  54  * write() for these nodes.
  55  */
  56 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  57 static ssize_t write_add(struct file *file, char *buf, size_t size);
  58 static ssize_t write_del(struct file *file, char *buf, size_t size);
  59 static ssize_t write_export(struct file *file, char *buf, size_t size);
  60 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  61 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  62 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  63 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  64 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  65 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  66 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  67 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  68 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  69 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  70 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  71 #ifdef CONFIG_NFSD_V4
  72 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  73 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  74 #endif
  75
  76 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  77         [NFSD_Svc] = write_svc,
  78         [NFSD_Add] = write_add,
  79         [NFSD_Del] = write_del,
  80         [NFSD_Export] = write_export,
  81         [NFSD_Unexport] = write_unexport,
  82         [NFSD_Getfd] = write_getfd,
  83         [NFSD_Getfs] = write_getfs,
  84         [NFSD_Fh] = write_filehandle,
  85         [NFSD_FO_UnlockIP] = write_unlock_ip,
  86         [NFSD_FO_UnlockFS] = write_unlock_fs,
  87         [NFSD_Threads] = write_threads,
  88         [NFSD_Pool_Threads] = write_pool_threads,
  89         [NFSD_Versions] = write_versions,
  90         [NFSD_Ports] = write_ports,
  91         [NFSD_MaxBlkSize] = write_maxblksize,
  92 #ifdef CONFIG_NFSD_V4
  93         [NFSD_Leasetime] = write_leasetime,
  94         [NFSD_RecoveryDir] = write_recoverydir,
  95 #endif
  96 };
  97
  98 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  99 {
 100         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 101         char *data;
 102         ssize_t rv;
 103
 104         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 105                 return -EINVAL;
 106
 107         data = simple_transaction_get(file, buf, size);
 108         if (IS_ERR(data))
 109                 return PTR_ERR(data);
 110
 111         rv =  write_op[ino](file, data, size);
 112         if (rv >= 0) {
 113                 simple_transaction_set(file, rv);
 114                 rv = size;
 115         }
 116         return rv;
 117 }
 118
 119 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 120 {
 121         if (! file->private_data) {
 122                 /* An attempt to read a transaction file without writing
 123                  * causes a 0-byte write so that the file can return
 124                  * state information
 125                  */
 126                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 127                 if (rv < 0)
 128                         return rv;
 129         }
 130         return simple_transaction_read(file, buf, size, pos);
 131 }
 132
 133 static const struct file_operations transaction_ops = {
 134         .write          = nfsctl_transaction_write,
 135         .read           = nfsctl_transaction_read,
 136         .release        = simple_transaction_release,
 137 };
 138
 139 static int exports_open(struct inode *inode, struct file *file)
 140 {
 141         return seq_open(file, &nfs_exports_op);
 142 }
 143
 144 static const struct file_operations exports_operations = {
 145         .open           = exports_open,
 146         .read           = seq_read,
 147         .llseek         = seq_lseek,
 148         .release        = seq_release,
 149         .owner          = THIS_MODULE,
 150 };
 151
 152 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 153 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 154
 155 static const struct file_operations pool_stats_operations = {
 156         .open           = nfsd_pool_stats_open,
 157         .read           = seq_read,
 158         .llseek         = seq_lseek,
 159         .release        = nfsd_pool_stats_release,
 160         .owner          = THIS_MODULE,
 161 };
 162
 163 /*----------------------------------------------------------------------------*/
 164 /*
 165  * payload - write methods
 166  */
 167
 168 /**
 169  * write_svc - Start kernel's NFSD server
 170  *
 171  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 172  * Function remains to support old versions of nfs-utils.
 173  *
 174  * Input:
 175  *                      buf:    struct nfsctl_svc
 176  *                              svc_port:       port number of this
 177  *                                              server's listener
 178  *                              svc_nthreads:   number of threads to start
 179  *                      size:   size in bytes of passed in nfsctl_svc
 180  * Output:
 181  *      On success:     returns zero
 182  *      On error:       return code is negative errno value
 183  */
 184 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 185 {
 186         struct nfsctl_svc *data;
 187         int err;
 188         if (size < sizeof(*data))
 189                 return -EINVAL;
 190         data = (struct nfsctl_svc*) buf;
 191         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 192         if (err < 0)
 193                 return err;
 194         return 0;
 195 }
 196
 197 /**
 198  * write_add - Add or modify client entry in auth unix cache
 199  *
 200  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 201  * Function remains to support old versions of nfs-utils.
 202  *
 203  * Input:
 204  *                      buf:    struct nfsctl_client
 205  *                              cl_ident:       '\0'-terminated C string
 206  *                                              containing domain name
 207  *                                              of client
 208  *                              cl_naddr:       no. of items in cl_addrlist
 209  *                              cl_addrlist:    array of client addresses
 210  *                              cl_fhkeytype:   ignored
 211  *                              cl_fhkeylen:    ignored
 212  *                              cl_fhkey:       ignored
 213  *                      size:   size in bytes of passed in nfsctl_client
 214  * Output:
 215  *      On success:     returns zero
 216  *      On error:       return code is negative errno value
 217  *
 218  * Note: Only AF_INET client addresses are passed in, since
 219  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 220  */
 221 static ssize_t write_add(struct file *file, char *buf, size_t size)
 222 {
 223         struct nfsctl_client *data;
 224         if (size < sizeof(*data))
 225                 return -EINVAL;
 226         data = (struct nfsctl_client *)buf;
 227         return exp_addclient(data);
 228 }
 229
 230 /**
 231  * write_del - Remove client from auth unix cache
 232  *
 233  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 234  * Function remains to support old versions of nfs-utils.
 235  *
 236  * Input:
 237  *                      buf:    struct nfsctl_client
 238  *                              cl_ident:       '\0'-terminated C string
 239  *                                              containing domain name
 240  *                                              of client
 241  *                              cl_naddr:       ignored
 242  *                              cl_addrlist:    ignored
 243  *                              cl_fhkeytype:   ignored
 244  *                              cl_fhkeylen:    ignored
 245  *                              cl_fhkey:       ignored
 246  *                      size:   size in bytes of passed in nfsctl_client
 247  * Output:
 248  *      On success:     returns zero
 249  *      On error:       return code is negative errno value
 250  *
 251  * Note: Only AF_INET client addresses are passed in, since
 252  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 253  */
 254 static ssize_t write_del(struct file *file, char *buf, size_t size)
 255 {
 256         struct nfsctl_client *data;
 257         if (size < sizeof(*data))
 258                 return -EINVAL;
 259         data = (struct nfsctl_client *)buf;
 260         return exp_delclient(data);
 261 }
 262
 263 /**
 264  * write_export - Export part or all of a local file system
 265  *
 266  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 267  * Function remains to support old versions of nfs-utils.
 268  *
 269  * Input:
 270  *                      buf:    struct nfsctl_export
 271  *                              ex_client:      '\0'-terminated C string
 272  *                                              containing domain name
 273  *                                              of client allowed to access
 274  *                                              this export
 275  *                              ex_path:        '\0'-terminated C string
 276  *                                              containing pathname of
 277  *                                              directory in local file system
 278  *                              ex_dev:         fsid to use for this export
 279  *                              ex_ino:         ignored
 280  *                              ex_flags:       export flags for this export
 281  *                              ex_anon_uid:    UID to use for anonymous
 282  *                                              requests
 283  *                              ex_anon_gid:    GID to use for anonymous
 284  *                                              requests
 285  *                      size:   size in bytes of passed in nfsctl_export
 286  * Output:
 287  *      On success:     returns zero
 288  *      On error:       return code is negative errno value
 289  */
 290 static ssize_t write_export(struct file *file, char *buf, size_t size)
 291 {
 292         struct nfsctl_export *data;
 293         if (size < sizeof(*data))
 294                 return -EINVAL;
 295         data = (struct nfsctl_export*)buf;
 296         return exp_export(data);
 297 }
 298
 299 /**
 300  * write_unexport - Unexport a previously exported file system
 301  *
 302  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 303  * Function remains to support old versions of nfs-utils.
 304  *
 305  * Input:
 306  *                      buf:    struct nfsctl_export
 307  *                              ex_client:      '\0'-terminated C string
 308  *                                              containing domain name
 309  *                                              of client no longer allowed
 310  *                                              to access this export
 311  *                              ex_path:        '\0'-terminated C string
 312  *                                              containing pathname of
 313  *                                              directory in local file system
 314  *                              ex_dev:         ignored
 315  *                              ex_ino:         ignored
 316  *                              ex_flags:       ignored
 317  *                              ex_anon_uid:    ignored
 318  *                              ex_anon_gid:    ignored
 319  *                      size:   size in bytes of passed in nfsctl_export
 320  * Output:
 321  *      On success:     returns zero
 322  *      On error:       return code is negative errno value
 323  */
 324 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 325 {
 326         struct nfsctl_export *data;
 327
 328         if (size < sizeof(*data))
 329                 return -EINVAL;
 330         data = (struct nfsctl_export*)buf;
 331         return exp_unexport(data);
 332 }
 333
 334 /**
 335  * write_getfs - Get a variable-length NFS file handle by path
 336  *
 337  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 338  * Function remains to support old versions of nfs-utils.
 339  *
 340  * Input:
 341  *                      buf:    struct nfsctl_fsparm
 342  *                              gd_addr:        socket address of client
 343  *                              gd_path:        '\0'-terminated C string
 344  *                                              containing pathname of
 345  *                                              directory in local file system
 346  *                              gd_maxlen:      maximum size of returned file
 347  *                                              handle
 348  *                      size:   size in bytes of passed in nfsctl_fsparm
 349  * Output:
 350  *      On success:     passed-in buffer filled with a knfsd_fh structure
 351  *                      (a variable-length raw NFS file handle);
 352  *                      return code is the size in bytes of the file handle
 353  *      On error:       return code is negative errno value
 354  *
 355  * Note: Only AF_INET client addresses are passed in, since gd_addr
 356  * is the same size as a struct sockaddr_in.
 357  */
 358 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 359 {
 360         struct nfsctl_fsparm *data;
 361         struct sockaddr_in *sin;
 362         struct auth_domain *clp;
 363         int err = 0;
 364         struct knfsd_fh *res;
 365         struct in6_addr in6;
 366
 367         if (size < sizeof(*data))
 368                 return -EINVAL;
 369         data = (struct nfsctl_fsparm*)buf;
 370         err = -EPROTONOSUPPORT;
 371         if (data->gd_addr.sa_family != AF_INET)
 372                 goto out;
 373         sin = (struct sockaddr_in *)&data->gd_addr;
 374         if (data->gd_maxlen > NFS3_FHSIZE)
 375                 data->gd_maxlen = NFS3_FHSIZE;
 376
 377         res = (struct knfsd_fh*)buf;
 378
 379         exp_readlock();
 380
 381         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 382
 383         clp = auth_unix_lookup(&in6);
 384         if (!clp)
 385                 err = -EPERM;
 386         else {
 387                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 388                 auth_domain_put(clp);
 389         }
 390         exp_readunlock();
 391         if (err == 0)
 392                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 393  out:
 394         return err;
 395 }
 396
 397 /**
 398  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 399  *
 400  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 401  * Function remains to support old versions of nfs-utils.
 402  *
 403  * Input:
 404  *                      buf:    struct nfsctl_fdparm
 405  *                              gd_addr:        socket address of client
 406  *                              gd_path:        '\0'-terminated C string
 407  *                                              containing pathname of
 408  *                                              directory in local file system
 409  *                              gd_version:     fdparm structure version
 410  *                      size:   size in bytes of passed in nfsctl_fdparm
 411  * Output:
 412  *      On success:     passed-in buffer filled with nfsctl_res
 413  *                      (a fixed-length raw NFS file handle);
 414  *                      return code is the size in bytes of the file handle
 415  *      On error:       return code is negative errno value
 416  *
 417  * Note: Only AF_INET client addresses are passed in, since gd_addr
 418  * is the same size as a struct sockaddr_in.
 419  */
 420 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 421 {
 422         struct nfsctl_fdparm *data;
 423         struct sockaddr_in *sin;
 424         struct auth_domain *clp;
 425         int err = 0;
 426         struct knfsd_fh fh;
 427         char *res;
 428         struct in6_addr in6;
 429
 430         if (size < sizeof(*data))
 431                 return -EINVAL;
 432         data = (struct nfsctl_fdparm*)buf;
 433         err = -EPROTONOSUPPORT;
 434         if (data->gd_addr.sa_family != AF_INET)
 435                 goto out;
 436         err = -EINVAL;
 437         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 438                 goto out;
 439
 440         res = buf;
 441         sin = (struct sockaddr_in *)&data->gd_addr;
 442         exp_readlock();
 443
 444         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 445
 446         clp = auth_unix_lookup(&in6);
 447         if (!clp)
 448                 err = -EPERM;
 449         else {
 450                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 451                 auth_domain_put(clp);
 452         }
 453         exp_readunlock();
 454
 455         if (err == 0) {
 456                 memset(res,0, NFS_FHSIZE);
 457                 memcpy(res, &fh.fh_base, fh.fh_size);
 458                 err = NFS_FHSIZE;
 459         }
 460  out:
 461         return err;
 462 }
 463
 464 /**
 465  * write_unlock_ip - Release all locks used by a client
 466  *
 467  * Experimental.
 468  *
 469  * Input:
 470  *                      buf:    '\n'-terminated C string containing a
 471  *                              presentation format IP address
 472  *                      size:   length of C string in @buf
 473  * Output:
 474  *      On success:     returns zero if all specified locks were released;
 475  *                      returns one if one or more locks were not released
 476  *      On error:       return code is negative errno value
 477  */
 478 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 479 {
 480         struct sockaddr_storage address;
 481         struct sockaddr *sap = (struct sockaddr *)&address;
 482         size_t salen = sizeof(address);
 483         char *fo_path;
 484
 485         /* sanity check */
 486         if (size == 0)
 487                 return -EINVAL;
 488
 489         if (buf[size-1] != '\n')
 490                 return -EINVAL;
 491
 492         fo_path = buf;
 493         if (qword_get(&buf, fo_path, size) < 0)
 494                 return -EINVAL;
 495
 496         if (rpc_pton(fo_path, size, sap, salen) == 0)
 497                 return -EINVAL;
 498
 499         return nlmsvc_unlock_all_by_ip(sap);
 500 }
 501
 502 /**
 503  * write_unlock_fs - Release all locks on a local file system
 504  *
 505  * Experimental.
 506  *
 507  * Input:
 508  *                      buf:    '\n'-terminated C string containing the
 509  *                              absolute pathname of a local file system
 510  *                      size:   length of C string in @buf
 511  * Output:
 512  *      On success:     returns zero if all specified locks were released;
 513  *                      returns one if one or more locks were not released
 514  *      On error:       return code is negative errno value
 515  */
 516 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 517 {
 518         struct path path;
 519         char *fo_path;
 520         int error;
 521
 522         /* sanity check */
 523         if (size == 0)
 524                 return -EINVAL;
 525
 526         if (buf[size-1] != '\n')
 527                 return -EINVAL;
 528
 529         fo_path = buf;
 530         if (qword_get(&buf, fo_path, size) < 0)
 531                 return -EINVAL;
 532
 533         error = kern_path(fo_path, 0, &path);
 534         if (error)
 535                 return error;
 536
 537         /*
 538          * XXX: Needs better sanity checking.  Otherwise we could end up
 539          * releasing locks on the wrong file system.
 540          *
 541          * For example:
 542          * 1.  Does the path refer to a directory?
 543          * 2.  Is that directory a mount point, or
 544          * 3.  Is that directory the root of an exported file system?
 545          */
 546         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 547
 548         path_put(&path);
 549         return error;
 550 }
 551
 552 /**
 553  * write_filehandle - Get a variable-length NFS file handle by path
 554  *
 555  * On input, the buffer contains a '\n'-terminated C string comprised of
 556  * three alphanumeric words separated by whitespace.  The string may
 557  * contain escape sequences.
 558  *
 559  * Input:
 560  *                      buf:
 561  *                              domain:         client domain name
 562  *                              path:           export pathname
 563  *                              maxsize:        numeric maximum size of
 564  *                                              @buf
 565  *                      size:   length of C string in @buf
 566  * Output:
 567  *      On success:     passed-in buffer filled with '\n'-terminated C
 568  *                      string containing a ASCII hex text version
 569  *                      of the NFS file handle;
 570  *                      return code is the size in bytes of the string
 571  *      On error:       return code is negative errno value
 572  */
 573 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 574 {
 575         char *dname, *path;
 576         int uninitialized_var(maxsize);
 577         char *mesg = buf;
 578         int len;
 579         struct auth_domain *dom;
 580         struct knfsd_fh fh;
 581
 582         if (size == 0)
 583                 return -EINVAL;
 584
 585         if (buf[size-1] != '\n')
 586                 return -EINVAL;
 587         buf[size-1] = 0;
 588
 589         dname = mesg;
 590         len = qword_get(&mesg, dname, size);
 591         if (len <= 0)
 592                 return -EINVAL;
 593
 594         path = dname+len+1;
 595         len = qword_get(&mesg, path, size);
 596         if (len <= 0)
 597                 return -EINVAL;
 598
 599         len = get_int(&mesg, &maxsize);
 600         if (len)
 601                 return len;
 602
 603         if (maxsize < NFS_FHSIZE)
 604                 return -EINVAL;
 605         if (maxsize > NFS3_FHSIZE)
 606                 maxsize = NFS3_FHSIZE;
 607
 608         if (qword_get(&mesg, mesg, size)>0)
 609                 return -EINVAL;
 610
 611         /* we have all the words, they are in buf.. */
 612         dom = unix_domain_find(dname);
 613         if (!dom)
 614                 return -ENOMEM;
 615
 616         len = exp_rootfh(dom, path, &fh,  maxsize);
 617         auth_domain_put(dom);
 618         if (len)
 619                 return len;
 620
 621         mesg = buf;
 622         len = SIMPLE_TRANSACTION_LIMIT;
 623         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 624         mesg[-1] = '\n';
 625         return mesg - buf;
 626 }
 627
 628 /**
 629  * write_threads - Start NFSD, or report the current number of running threads
 630  *
 631  * Input:
 632  *                      buf:            ignored
 633  *                      size:           zero
 634  * Output:
 635  *      On success:     passed-in buffer filled with '\n'-terminated C
 636  *                      string numeric value representing the number of
 637  *                      running NFSD threads;
 638  *                      return code is the size in bytes of the string
 639  *      On error:       return code is zero
 640  *
 641  * OR
 642  *
 643  * Input:
 644  *                      buf:            C string containing an unsigned
 645  *                                      integer value representing the
 646  *                                      number of NFSD threads to start
 647  *                      size:           non-zero length of C string in @buf
 648  * Output:
 649  *      On success:     NFS service is started;
 650  *                      passed-in buffer filled with '\n'-terminated C
 651  *                      string numeric value representing the number of
 652  *                      running NFSD threads;
 653  *                      return code is the size in bytes of the string
 654  *      On error:       return code is zero or a negative errno value
 655  */
 656 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 657 {
 658         char *mesg = buf;
 659         int rv;
 660         if (size > 0) {
 661                 int newthreads;
 662                 rv = get_int(&mesg, &newthreads);
 663                 if (rv)
 664                         return rv;
 665                 if (newthreads < 0)
 666                         return -EINVAL;
 667                 rv = nfsd_svc(NFS_PORT, newthreads);
 668                 if (rv < 0)
 669                         return rv;
 670         } else
 671                 rv = nfsd_nrthreads();
 672
 673         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 674 }
 675
 676 /**
 677  * write_pool_threads - Set or report the current number of threads per pool
 678  *
 679  * Input:
 680  *                      buf:            ignored
 681  *                      size:           zero
 682  *
 683  * OR
 684  *
 685  * Input:
 686  *                      buf:            C string containing whitespace-
 687  *                                      separated unsigned integer values
 688  *                                      representing the number of NFSD
 689  *                                      threads to start in each pool
 690  *                      size:           non-zero length of C string in @buf
 691  * Output:
 692  *      On success:     passed-in buffer filled with '\n'-terminated C
 693  *                      string containing integer values representing the
 694  *                      number of NFSD threads in each pool;
 695  *                      return code is the size in bytes of the string
 696  *      On error:       return code is zero or a negative errno value
 697  */
 698 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 699 {
 700         /* if size > 0, look for an array of number of threads per node
 701          * and apply them  then write out number of threads per node as reply
 702          */
 703         char *mesg = buf;
 704         int i;
 705         int rv;
 706         int len;
 707         int npools;
 708         int *nthreads;
 709
 710         mutex_lock(&nfsd_mutex);
 711         npools = nfsd_nrpools();
 712         if (npools == 0) {
 713                 /*
 714                  * NFS is shut down.  The admin can start it by
 715                  * writing to the threads file but NOT the pool_threads
 716                  * file, sorry.  Report zero threads.
 717                  */
 718                 mutex_unlock(&nfsd_mutex);
 719                 strcpy(buf, "0\n");
 720                 return strlen(buf);
 721         }
 722
 723         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 724         rv = -ENOMEM;
 725         if (nthreads == NULL)
 726                 goto out_free;
 727
 728         if (size > 0) {
 729                 for (i = 0; i < npools; i++) {
 730                         rv = get_int(&mesg, &nthreads[i]);
 731                         if (rv == -ENOENT)
 732                                 break;          /* fewer numbers than pools */
 733                         if (rv)
 734                                 goto out_free;  /* syntax error */
 735                         rv = -EINVAL;
 736                         if (nthreads[i] < 0)
 737                                 goto out_free;
 738                 }
 739                 rv = nfsd_set_nrthreads(i, nthreads);
 740                 if (rv)
 741                         goto out_free;
 742         }
 743
 744         rv = nfsd_get_nrthreads(npools, nthreads);
 745         if (rv)
 746                 goto out_free;
 747
 748         mesg = buf;
 749         size = SIMPLE_TRANSACTION_LIMIT;
 750         for (i = 0; i < npools && size > 0; i++) {
 751                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 752                 len = strlen(mesg);
 753                 size -= len;
 754                 mesg += len;
 755         }
 756         rv = mesg - buf;
 757 out_free:
 758         kfree(nthreads);
 759         mutex_unlock(&nfsd_mutex);
 760         return rv;
 761 }
 762
 763 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 764 {
 765         char *mesg = buf;
 766         char *vers, *minorp, sign;
 767         int len, num, remaining;
 768         unsigned minor;
 769         ssize_t tlen = 0;
 770         char *sep;
 771
 772         if (size>0) {
 773                 if (nfsd_serv)
 774                         /* Cannot change versions without updating
 775                          * nfsd_serv->sv_xdrsize, and reallocing
 776                          * rq_argp and rq_resp
 777                          */
 778                         return -EBUSY;
 779                 if (buf[size-1] != '\n')
 780                         return -EINVAL;
 781                 buf[size-1] = 0;
 782
 783                 vers = mesg;
 784                 len = qword_get(&mesg, vers, size);
 785                 if (len <= 0) return -EINVAL;
 786                 do {
 787                         sign = *vers;
 788                         if (sign == '+' || sign == '-')
 789                                 num = simple_strtol((vers+1), &minorp, 0);
 790                         else
 791                                 num = simple_strtol(vers, &minorp, 0);
 792                         if (*minorp == '.') {
 793                                 if (num < 4)
 794                                         return -EINVAL;
 795                                 minor = simple_strtoul(minorp+1, NULL, 0);
 796                                 if (minor == 0)
 797                                         return -EINVAL;
 798                                 if (nfsd_minorversion(minor, sign == '-' ?
 799                                                      NFSD_CLEAR : NFSD_SET) < 0)
 800                                         return -EINVAL;
 801                                 goto next;
 802                         }
 803                         switch(num) {
 804                         case 2:
 805                         case 3:
 806                         case 4:
 807                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 808                                 break;
 809                         default:
 810                                 return -EINVAL;
 811                         }
 812                 next:
 813                         vers += len + 1;
 814                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 815                 /* If all get turned off, turn them back on, as
 816                  * having no versions is BAD
 817                  */
 818                 nfsd_reset_versions();
 819         }
 820
 821         /* Now write current state into reply buffer */
 822         len = 0;
 823         sep = "";
 824         remaining = SIMPLE_TRANSACTION_LIMIT;
 825         for (num=2 ; num <= 4 ; num++)
 826                 if (nfsd_vers(num, NFSD_AVAIL)) {
 827                         len = snprintf(buf, remaining, "%s%c%d", sep,
 828                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 829                                        num);
 830                         sep = " ";
 831
 832                         if (len > remaining)
 833                                 break;
 834                         remaining -= len;
 835                         buf += len;
 836                         tlen += len;
 837                 }
 838         if (nfsd_vers(4, NFSD_AVAIL))
 839                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 840                      minor++) {
 841                         len = snprintf(buf, remaining, " %c4.%u",
 842                                         (nfsd_vers(4, NFSD_TEST) &&
 843                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 844                                                 '+' : '-',
 845                                         minor);
 846
 847                         if (len > remaining)
 848                                 break;
 849                         remaining -= len;
 850                         buf += len;
 851                         tlen += len;
 852                 }
 853
 854         len = snprintf(buf, remaining, "\n");
 855         if (len > remaining)
 856                 return -EINVAL;
 857         return tlen + len;
 858 }
 859
 860 /**
 861  * write_versions - Set or report the available NFS protocol versions
 862  *
 863  * Input:
 864  *                      buf:            ignored
 865  *                      size:           zero
 866  * Output:
 867  *      On success:     passed-in buffer filled with '\n'-terminated C
 868  *                      string containing positive or negative integer
 869  *                      values representing the current status of each
 870  *                      protocol version;
 871  *                      return code is the size in bytes of the string
 872  *      On error:       return code is zero or a negative errno value
 873  *
 874  * OR
 875  *
 876  * Input:
 877  *                      buf:            C string containing whitespace-
 878  *                                      separated positive or negative
 879  *                                      integer values representing NFS
 880  *                                      protocol versions to enable ("+n")
 881  *                                      or disable ("-n")
 882  *                      size:           non-zero length of C string in @buf
 883  * Output:
 884  *      On success:     status of zero or more protocol versions has
 885  *                      been updated; passed-in buffer filled with
 886  *                      '\n'-terminated C string containing positive
 887  *                      or negative integer values representing the
 888  *                      current status of each protocol version;
 889  *                      return code is the size in bytes of the string
 890  *      On error:       return code is zero or a negative errno value
 891  */
 892 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 893 {
 894         ssize_t rv;
 895
 896         mutex_lock(&nfsd_mutex);
 897         rv = __write_versions(file, buf, size);
 898         mutex_unlock(&nfsd_mutex);
 899         return rv;
 900 }
 901
 902 /*
 903  * Zero-length write.  Return a list of NFSD's current listener
 904  * transports.
 905  */
 906 static ssize_t __write_ports_names(char *buf)
 907 {
 908         if (nfsd_serv == NULL)
 909                 return 0;
 910         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 911 }
 912
 913 /*
 914  * A single 'fd' number was written, in which case it must be for
 915  * a socket of a supported family/protocol, and we use it as an
 916  * nfsd listener.
 917  */
 918 static ssize_t __write_ports_addfd(char *buf)
 919 {
 920         char *mesg = buf;
 921         int fd, err;
 922
 923         err = get_int(&mesg, &fd);
 924         if (err != 0 || fd < 0)
 925                 return -EINVAL;
 926
 927         err = nfsd_create_serv();
 928         if (err != 0)
 929                 return err;
 930
 931         err = lockd_up();
 932         if (err != 0)
 933                 goto out;
 934
 935         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 936         if (err < 0)
 937                 lockd_down();
 938
 939 out:
 940         /* Decrease the count, but don't shut down the service */
 941         nfsd_serv->sv_nrthreads--;
 942         return err;
 943 }
 944
 945 /*
 946  * A '-' followed by the 'name' of a socket means we close the socket.
 947  */
 948 static ssize_t __write_ports_delfd(char *buf)
 949 {
 950         char *toclose;
 951         int len = 0;
 952
 953         toclose = kstrdup(buf + 1, GFP_KERNEL);
 954         if (toclose == NULL)
 955                 return -ENOMEM;
 956
 957         if (nfsd_serv != NULL)
 958                 len = svc_sock_names(nfsd_serv, buf,
 959                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 960         if (len >= 0)
 961                 lockd_down();
 962
 963         kfree(toclose);
 964         return len;
 965 }
 966
 967 /*
 968  * A transport listener is added by writing it's transport name and
 969  * a port number.
 970  */
 971 static ssize_t __write_ports_addxprt(char *buf)
 972 {
 973         char transport[16];
 974         int port, err;
 975
 976         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 977                 return -EINVAL;
 978
 979         if (port < 1 || port > USHORT_MAX)
 980                 return -EINVAL;
 981
 982         err = nfsd_create_serv();
 983         if (err != 0)
 984                 return err;
 985
 986         err = svc_create_xprt(nfsd_serv, transport,
 987                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 988         if (err < 0) {
 989                 /* Give a reasonable perror msg for bad transport string */
 990                 if (err == -ENOENT)
 991                         err = -EPROTONOSUPPORT;
 992                 return err;
 993         }
 994         return 0;
 995 }
 996
 997 /*
 998  * A transport listener is removed by writing a "-", it's transport
 999  * name, and it's port number.
1000  */
1001 static ssize_t __write_ports_delxprt(char *buf)
1002 {
1003         struct svc_xprt *xprt;
1004         char transport[16];
1005         int port;
1006
1007         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1008                 return -EINVAL;
1009
1010         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1011                 return -EINVAL;
1012
1013         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1014         if (xprt == NULL)
1015                 return -ENOTCONN;
1016
1017         svc_close_xprt(xprt);
1018         svc_xprt_put(xprt);
1019         return 0;
1020 }
1021
1022 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1023 {
1024         if (size == 0)
1025                 return __write_ports_names(buf);
1026
1027         if (isdigit(buf[0]))
1028                 return __write_ports_addfd(buf);
1029
1030         if (buf[0] == '-' && isdigit(buf[1]))
1031                 return __write_ports_delfd(buf);
1032
1033         if (isalpha(buf[0]))
1034                 return __write_ports_addxprt(buf);
1035
1036         if (buf[0] == '-' && isalpha(buf[1]))
1037                 return __write_ports_delxprt(buf);
1038
1039         return -EINVAL;
1040 }
1041
1042 /**
1043  * write_ports - Pass a socket file descriptor or transport name to listen on
1044  *
1045  * Input:
1046  *                      buf:            ignored
1047  *                      size:           zero
1048  * Output:
1049  *      On success:     passed-in buffer filled with a '\n'-terminated C
1050  *                      string containing a whitespace-separated list of
1051  *                      named NFSD listeners;
1052  *                      return code is the size in bytes of the string
1053  *      On error:       return code is zero or a negative errno value
1054  *
1055  * OR
1056  *
1057  * Input:
1058  *                      buf:            C string containing an unsigned
1059  *                                      integer value representing a bound
1060  *                                      but unconnected socket that is to be
1061  *                                      used as an NFSD listener; listen(3)
1062  *                                      must be called for a SOCK_STREAM
1063  *                                      socket, otherwise it is ignored
1064  *                      size:           non-zero length of C string in @buf
1065  * Output:
1066  *      On success:     NFS service is started;
1067  *                      passed-in buffer filled with a '\n'-terminated C
1068  *                      string containing a unique alphanumeric name of
1069  *                      the listener;
1070  *                      return code is the size in bytes of the string
1071  *      On error:       return code is a negative errno value
1072  *
1073  * OR
1074  *
1075  * Input:
1076  *                      buf:            C string containing a "-" followed
1077  *                                      by an integer value representing a
1078  *                                      previously passed in socket file
1079  *                                      descriptor
1080  *                      size:           non-zero length of C string in @buf
1081  * Output:
1082  *      On success:     NFS service no longer listens on that socket;
1083  *                      passed-in buffer filled with a '\n'-terminated C
1084  *                      string containing a unique name of the listener;
1085  *                      return code is the size in bytes of the string
1086  *      On error:       return code is a negative errno value
1087  *
1088  * OR
1089  *
1090  * Input:
1091  *                      buf:            C string containing a transport
1092  *                                      name and an unsigned integer value
1093  *                                      representing the port to listen on,
1094  *                                      separated by whitespace
1095  *                      size:           non-zero length of C string in @buf
1096  * Output:
1097  *      On success:     returns zero; NFS service is started
1098  *      On error:       return code is a negative errno value
1099  *
1100  * OR
1101  *
1102  * Input:
1103  *                      buf:            C string containing a "-" followed
1104  *                                      by a transport name and an unsigned
1105  *                                      integer value representing the port
1106  *                                      to listen on, separated by whitespace
1107  *                      size:           non-zero length of C string in @buf
1108  * Output:
1109  *      On success:     returns zero; NFS service no longer listens
1110  *                      on that transport
1111  *      On error:       return code is a negative errno value
1112  */
1113 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1114 {
1115         ssize_t rv;
1116
1117         mutex_lock(&nfsd_mutex);
1118         rv = __write_ports(file, buf, size);
1119         mutex_unlock(&nfsd_mutex);
1120         return rv;
1121 }
1122
1123
1124 int nfsd_max_blksize;
1125
1126 /**
1127  * write_maxblksize - Set or report the current NFS blksize
1128  *
1129  * Input:
1130  *                      buf:            ignored
1131  *                      size:           zero
1132  *
1133  * OR
1134  *
1135  * Input:
1136  *                      buf:            C string containing an unsigned
1137  *                                      integer value representing the new
1138  *                                      NFS blksize
1139  *                      size:           non-zero length of C string in @buf
1140  * Output:
1141  *      On success:     passed-in buffer filled with '\n'-terminated C string
1142  *                      containing numeric value of the current NFS blksize
1143  *                      setting;
1144  *                      return code is the size in bytes of the string
1145  *      On error:       return code is zero or a negative errno value
1146  */
1147 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1148 {
1149         char *mesg = buf;
1150         if (size > 0) {
1151                 int bsize;
1152                 int rv = get_int(&mesg, &bsize);
1153                 if (rv)
1154                         return rv;
1155                 /* force bsize into allowed range and
1156                  * required alignment.
1157                  */
1158                 if (bsize < 1024)
1159                         bsize = 1024;
1160                 if (bsize > NFSSVC_MAXBLKSIZE)
1161                         bsize = NFSSVC_MAXBLKSIZE;
1162                 bsize &= ~(1024-1);
1163                 mutex_lock(&nfsd_mutex);
1164                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1165                         mutex_unlock(&nfsd_mutex);
1166                         return -EBUSY;
1167                 }
1168                 nfsd_max_blksize = bsize;
1169                 mutex_unlock(&nfsd_mutex);
1170         }
1171
1172         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1173                                                         nfsd_max_blksize);
1174 }
1175
1176 #ifdef CONFIG_NFSD_V4
1177 extern time_t nfs4_leasetime(void);
1178
1179 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1180 {
1181         /* if size > 10 seconds, call
1182          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1183          */
1184         char *mesg = buf;
1185         int rv, lease;
1186
1187         if (size > 0) {
1188                 if (nfsd_serv)
1189                         return -EBUSY;
1190                 rv = get_int(&mesg, &lease);
1191                 if (rv)
1192                         return rv;
1193                 if (lease < 10 || lease > 3600)
1194                         return -EINVAL;
1195                 nfs4_reset_lease(lease);
1196         }
1197
1198         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1199                                                         nfs4_lease_time());
1200 }
1201
1202 /**
1203  * write_leasetime - Set or report the current NFSv4 lease time
1204  *
1205  * Input:
1206  *                      buf:            ignored
1207  *                      size:           zero
1208  *
1209  * OR
1210  *
1211  * Input:
1212  *                      buf:            C string containing an unsigned
1213  *                                      integer value representing the new
1214  *                                      NFSv4 lease expiry time
1215  *                      size:           non-zero length of C string in @buf
1216  * Output:
1217  *      On success:     passed-in buffer filled with '\n'-terminated C
1218  *                      string containing unsigned integer value of the
1219  *                      current lease expiry time;
1220  *                      return code is the size in bytes of the string
1221  *      On error:       return code is zero or a negative errno value
1222  */
1223 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1224 {
1225         ssize_t rv;
1226
1227         mutex_lock(&nfsd_mutex);
1228         rv = __write_leasetime(file, buf, size);
1229         mutex_unlock(&nfsd_mutex);
1230         return rv;
1231 }
1232
1233 extern char *nfs4_recoverydir(void);
1234
1235 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1236 {
1237         char *mesg = buf;
1238         char *recdir;
1239         int len, status;
1240
1241         if (size > 0) {
1242                 if (nfsd_serv)
1243                         return -EBUSY;
1244                 if (size > PATH_MAX || buf[size-1] != '\n')
1245                         return -EINVAL;
1246                 buf[size-1] = 0;
1247
1248                 recdir = mesg;
1249                 len = qword_get(&mesg, recdir, size);
1250                 if (len <= 0)
1251                         return -EINVAL;
1252
1253                 status = nfs4_reset_recoverydir(recdir);
1254         }
1255
1256         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1257                                                         nfs4_recoverydir());
1258 }
1259
1260 /**
1261  * write_recoverydir - Set or report the pathname of the recovery directory
1262  *
1263  * Input:
1264  *                      buf:            ignored
1265  *                      size:           zero
1266  *
1267  * OR
1268  *
1269  * Input:
1270  *                      buf:            C string containing the pathname
1271  *                                      of the directory on a local file
1272  *                                      system containing permanent NFSv4
1273  *                                      recovery data
1274  *                      size:           non-zero length of C string in @buf
1275  * Output:
1276  *      On success:     passed-in buffer filled with '\n'-terminated C string
1277  *                      containing the current recovery pathname setting;
1278  *                      return code is the size in bytes of the string
1279  *      On error:       return code is zero or a negative errno value
1280  */
1281 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1282 {
1283         ssize_t rv;
1284
1285         mutex_lock(&nfsd_mutex);
1286         rv = __write_recoverydir(file, buf, size);
1287         mutex_unlock(&nfsd_mutex);
1288         return rv;
1289 }
1290
1291 #endif
1292
1293 /*----------------------------------------------------------------------------*/
1294 /*
1295  *      populating the filesystem.
1296  */
1297
1298 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1299 {
1300         static struct tree_descr nfsd_files[] = {
1301                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1302                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1303                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1304                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1305                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1306                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1307                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1308                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1309                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1310                                         &transaction_ops, S_IWUSR|S_IRUSR},
1311                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1312                                         &transaction_ops, S_IWUSR|S_IRUSR},
1313                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1314                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1315                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1316                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1317                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1318                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1319                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1320 #ifdef CONFIG_NFSD_V4
1321                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1322                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1323 #endif
1324                 /* last one */ {""}
1325         };
1326         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1327 }
1328
1329 static int nfsd_get_sb(struct file_system_type *fs_type,
1330         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1331 {
1332         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1333 }
1334
1335 static struct file_system_type nfsd_fs_type = {
1336         .owner          = THIS_MODULE,
1337         .name           = "nfsd",
1338         .get_sb         = nfsd_get_sb,
1339         .kill_sb        = kill_litter_super,
1340 };
1341
1342 #ifdef CONFIG_PROC_FS
1343 static int create_proc_exports_entry(void)
1344 {
1345         struct proc_dir_entry *entry;
1346
1347         entry = proc_mkdir("fs/nfs", NULL);
1348         if (!entry)
1349                 return -ENOMEM;
1350         entry = proc_create("exports", 0, entry, &exports_operations);
1351         if (!entry)
1352                 return -ENOMEM;
1353         return 0;
1354 }
1355 #else /* CONFIG_PROC_FS */
1356 static int create_proc_exports_entry(void)
1357 {
1358         return 0;
1359 }
1360 #endif
1361
1362 static int __init init_nfsd(void)
1363 {
1364         int retval;
1365         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1366
1367         retval = nfs4_state_init(); /* nfs4 locking state */
1368         if (retval)
1369                 return retval;
1370         nfsd_stat_init();       /* Statistics */
1371         retval = nfsd_reply_cache_init();
1372         if (retval)
1373                 goto out_free_stat;
1374         retval = nfsd_export_init();
1375         if (retval)
1376                 goto out_free_cache;
1377         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1378         retval = nfsd_idmap_init();
1379         if (retval)
1380                 goto out_free_lockd;
1381         retval = create_proc_exports_entry();
1382         if (retval)
1383                 goto out_free_idmap;
1384         retval = register_filesystem(&nfsd_fs_type);
1385         if (retval)
1386                 goto out_free_all;
1387         return 0;
1388 out_free_all:
1389         remove_proc_entry("fs/nfs/exports", NULL);
1390         remove_proc_entry("fs/nfs", NULL);
1391 out_free_idmap:
1392         nfsd_idmap_shutdown();
1393 out_free_lockd:
1394         nfsd_lockd_shutdown();
1395         nfsd_export_shutdown();
1396 out_free_cache:
1397         nfsd_reply_cache_shutdown();
1398 out_free_stat:
1399         nfsd_stat_shutdown();
1400         nfsd4_free_slabs();
1401         return retval;
1402 }
1403
1404 static void __exit exit_nfsd(void)
1405 {
1406         nfsd_export_shutdown();
1407         nfsd_reply_cache_shutdown();
1408         remove_proc_entry("fs/nfs/exports", NULL);
1409         remove_proc_entry("fs/nfs", NULL);
1410         nfsd_stat_shutdown();
1411         nfsd_lockd_shutdown();
1412         nfsd_idmap_shutdown();
1413         nfsd4_free_slabs();
1414         unregister_filesystem(&nfsd_fs_type);
1415 }
1416
1417 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1418 MODULE_LICENSE("GPL");
1419 module_init(init_nfsd)
1420 module_exit(exit_nfsd)