fs/nfsd/nfsctl.c

   1 /*
   2  * Syscall interface to knfsd.
   3  *
   4  * Copyright (C) 1995, 1996 Olaf Kirch <[email protected]>
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/namei.h>
   9 #include <linux/ctype.h>
  10
  11 #include <linux/nfsd_idmap.h>
  12 #include <linux/sunrpc/svcsock.h>
  13 #include <linux/nfsd/syscall.h>
  14 #include <linux/lockd/lockd.h>
  15 #include <linux/sunrpc/clnt.h>
  16
  17 #include "nfsd.h"
  18 #include "cache.h"
  19
  20 /*
  21  *      We have a single directory with 9 nodes in it.
  22  */
  23 enum {
  24         NFSD_Root = 1,
  25 #ifdef CONFIG_NFSD_DEPRECATED
  26         NFSD_Svc,
  27         NFSD_Add,
  28         NFSD_Del,
  29         NFSD_Export,
  30         NFSD_Unexport,
  31         NFSD_Getfd,
  32         NFSD_Getfs,
  33 #endif
  34         NFSD_List,
  35         NFSD_Export_features,
  36         NFSD_Fh,
  37         NFSD_FO_UnlockIP,
  38         NFSD_FO_UnlockFS,
  39         NFSD_Threads,
  40         NFSD_Pool_Threads,
  41         NFSD_Pool_Stats,
  42         NFSD_Versions,
  43         NFSD_Ports,
  44         NFSD_MaxBlkSize,
  45         /*
  46          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  47          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  48          */
  49 #ifdef CONFIG_NFSD_V4
  50         NFSD_Leasetime,
  51         NFSD_Gracetime,
  52         NFSD_RecoveryDir,
  53 #endif
  54 };
  55
  56 /*
  57  * write() for these nodes.
  58  */
  59 #ifdef CONFIG_NFSD_DEPRECATED
  60 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  61 static ssize_t write_add(struct file *file, char *buf, size_t size);
  62 static ssize_t write_del(struct file *file, char *buf, size_t size);
  63 static ssize_t write_export(struct file *file, char *buf, size_t size);
  64 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  65 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  66 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  67 #endif
  68 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  69 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  70 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  71 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  72 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  73 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  74 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  75 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  76 #ifdef CONFIG_NFSD_V4
  77 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  78 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  79 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  80 #endif
  81
  82 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  83 #ifdef CONFIG_NFSD_DEPRECATED
  84         [NFSD_Svc] = write_svc,
  85         [NFSD_Add] = write_add,
  86         [NFSD_Del] = write_del,
  87         [NFSD_Export] = write_export,
  88         [NFSD_Unexport] = write_unexport,
  89         [NFSD_Getfd] = write_getfd,
  90         [NFSD_Getfs] = write_getfs,
  91 #endif
  92         [NFSD_Fh] = write_filehandle,
  93         [NFSD_FO_UnlockIP] = write_unlock_ip,
  94         [NFSD_FO_UnlockFS] = write_unlock_fs,
  95         [NFSD_Threads] = write_threads,
  96         [NFSD_Pool_Threads] = write_pool_threads,
  97         [NFSD_Versions] = write_versions,
  98         [NFSD_Ports] = write_ports,
  99         [NFSD_MaxBlkSize] = write_maxblksize,
 100 #ifdef CONFIG_NFSD_V4
 101         [NFSD_Leasetime] = write_leasetime,
 102         [NFSD_Gracetime] = write_gracetime,
 103         [NFSD_RecoveryDir] = write_recoverydir,
 104 #endif
 105 };
 106
 107 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 108 {
 109         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 110         char *data;
 111         ssize_t rv;
 112
 113         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 114                 return -EINVAL;
 115
 116         data = simple_transaction_get(file, buf, size);
 117         if (IS_ERR(data))
 118                 return PTR_ERR(data);
 119
 120         rv =  write_op[ino](file, data, size);
 121         if (rv >= 0) {
 122                 simple_transaction_set(file, rv);
 123                 rv = size;
 124         }
 125         return rv;
 126 }
 127
 128 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 129 {
 130         static int warned;
 131         if (file->f_dentry->d_name.name[0] == '.' && !warned) {
 132                 printk(KERN_INFO
 133                        "Warning: \"%s\" uses deprecated NFSD interface: %s."
 134                        "  This will be removed in 2.6.40\n",
 135                        current->comm, file->f_dentry->d_name.name);
 136                 warned = 1;
 137         }
 138         if (! file->private_data) {
 139                 /* An attempt to read a transaction file without writing
 140                  * causes a 0-byte write so that the file can return
 141                  * state information
 142                  */
 143                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 144                 if (rv < 0)
 145                         return rv;
 146         }
 147         return simple_transaction_read(file, buf, size, pos);
 148 }
 149
 150 static const struct file_operations transaction_ops = {
 151         .write          = nfsctl_transaction_write,
 152         .read           = nfsctl_transaction_read,
 153         .release        = simple_transaction_release,
 154         .llseek         = default_llseek,
 155 };
 156
 157 static int exports_open(struct inode *inode, struct file *file)
 158 {
 159         return seq_open(file, &nfs_exports_op);
 160 }
 161
 162 static const struct file_operations exports_operations = {
 163         .open           = exports_open,
 164         .read           = seq_read,
 165         .llseek         = seq_lseek,
 166         .release        = seq_release,
 167         .owner          = THIS_MODULE,
 168 };
 169
 170 static int export_features_show(struct seq_file *m, void *v)
 171 {
 172         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 173         return 0;
 174 }
 175
 176 static int export_features_open(struct inode *inode, struct file *file)
 177 {
 178         return single_open(file, export_features_show, NULL);
 179 }
 180
 181 static struct file_operations export_features_operations = {
 182         .open           = export_features_open,
 183         .read           = seq_read,
 184         .llseek         = seq_lseek,
 185         .release        = single_release,
 186 };
 187
 188 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 189 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 190
 191 static const struct file_operations pool_stats_operations = {
 192         .open           = nfsd_pool_stats_open,
 193         .read           = seq_read,
 194         .llseek         = seq_lseek,
 195         .release        = nfsd_pool_stats_release,
 196         .owner          = THIS_MODULE,
 197 };
 198
 199 /*----------------------------------------------------------------------------*/
 200 /*
 201  * payload - write methods
 202  */
 203
 204 #ifdef CONFIG_NFSD_DEPRECATED
 205 /**
 206  * write_svc - Start kernel's NFSD server
 207  *
 208  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 209  * Function remains to support old versions of nfs-utils.
 210  *
 211  * Input:
 212  *                      buf:    struct nfsctl_svc
 213  *                              svc_port:       port number of this
 214  *                                              server's listener
 215  *                              svc_nthreads:   number of threads to start
 216  *                      size:   size in bytes of passed in nfsctl_svc
 217  * Output:
 218  *      On success:     returns zero
 219  *      On error:       return code is negative errno value
 220  */
 221 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 222 {
 223         struct nfsctl_svc *data;
 224         int err;
 225         if (size < sizeof(*data))
 226                 return -EINVAL;
 227         data = (struct nfsctl_svc*) buf;
 228         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 229         if (err < 0)
 230                 return err;
 231         return 0;
 232 }
 233
 234 /**
 235  * write_add - Add or modify client entry in auth unix cache
 236  *
 237  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 238  * Function remains to support old versions of nfs-utils.
 239  *
 240  * Input:
 241  *                      buf:    struct nfsctl_client
 242  *                              cl_ident:       '\0'-terminated C string
 243  *                                              containing domain name
 244  *                                              of client
 245  *                              cl_naddr:       no. of items in cl_addrlist
 246  *                              cl_addrlist:    array of client addresses
 247  *                              cl_fhkeytype:   ignored
 248  *                              cl_fhkeylen:    ignored
 249  *                              cl_fhkey:       ignored
 250  *                      size:   size in bytes of passed in nfsctl_client
 251  * Output:
 252  *      On success:     returns zero
 253  *      On error:       return code is negative errno value
 254  *
 255  * Note: Only AF_INET client addresses are passed in, since
 256  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 257  */
 258 static ssize_t write_add(struct file *file, char *buf, size_t size)
 259 {
 260         struct nfsctl_client *data;
 261         if (size < sizeof(*data))
 262                 return -EINVAL;
 263         data = (struct nfsctl_client *)buf;
 264         return exp_addclient(data);
 265 }
 266
 267 /**
 268  * write_del - Remove client from auth unix cache
 269  *
 270  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 271  * Function remains to support old versions of nfs-utils.
 272  *
 273  * Input:
 274  *                      buf:    struct nfsctl_client
 275  *                              cl_ident:       '\0'-terminated C string
 276  *                                              containing domain name
 277  *                                              of client
 278  *                              cl_naddr:       ignored
 279  *                              cl_addrlist:    ignored
 280  *                              cl_fhkeytype:   ignored
 281  *                              cl_fhkeylen:    ignored
 282  *                              cl_fhkey:       ignored
 283  *                      size:   size in bytes of passed in nfsctl_client
 284  * Output:
 285  *      On success:     returns zero
 286  *      On error:       return code is negative errno value
 287  *
 288  * Note: Only AF_INET client addresses are passed in, since
 289  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 290  */
 291 static ssize_t write_del(struct file *file, char *buf, size_t size)
 292 {
 293         struct nfsctl_client *data;
 294         if (size < sizeof(*data))
 295                 return -EINVAL;
 296         data = (struct nfsctl_client *)buf;
 297         return exp_delclient(data);
 298 }
 299
 300 /**
 301  * write_export - Export part or all of a local file system
 302  *
 303  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 304  * Function remains to support old versions of nfs-utils.
 305  *
 306  * Input:
 307  *                      buf:    struct nfsctl_export
 308  *                              ex_client:      '\0'-terminated C string
 309  *                                              containing domain name
 310  *                                              of client allowed to access
 311  *                                              this export
 312  *                              ex_path:        '\0'-terminated C string
 313  *                                              containing pathname of
 314  *                                              directory in local file system
 315  *                              ex_dev:         fsid to use for this export
 316  *                              ex_ino:         ignored
 317  *                              ex_flags:       export flags for this export
 318  *                              ex_anon_uid:    UID to use for anonymous
 319  *                                              requests
 320  *                              ex_anon_gid:    GID to use for anonymous
 321  *                                              requests
 322  *                      size:   size in bytes of passed in nfsctl_export
 323  * Output:
 324  *      On success:     returns zero
 325  *      On error:       return code is negative errno value
 326  */
 327 static ssize_t write_export(struct file *file, char *buf, size_t size)
 328 {
 329         struct nfsctl_export *data;
 330         if (size < sizeof(*data))
 331                 return -EINVAL;
 332         data = (struct nfsctl_export*)buf;
 333         return exp_export(data);
 334 }
 335
 336 /**
 337  * write_unexport - Unexport a previously exported file system
 338  *
 339  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 340  * Function remains to support old versions of nfs-utils.
 341  *
 342  * Input:
 343  *                      buf:    struct nfsctl_export
 344  *                              ex_client:      '\0'-terminated C string
 345  *                                              containing domain name
 346  *                                              of client no longer allowed
 347  *                                              to access this export
 348  *                              ex_path:        '\0'-terminated C string
 349  *                                              containing pathname of
 350  *                                              directory in local file system
 351  *                              ex_dev:         ignored
 352  *                              ex_ino:         ignored
 353  *                              ex_flags:       ignored
 354  *                              ex_anon_uid:    ignored
 355  *                              ex_anon_gid:    ignored
 356  *                      size:   size in bytes of passed in nfsctl_export
 357  * Output:
 358  *      On success:     returns zero
 359  *      On error:       return code is negative errno value
 360  */
 361 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 362 {
 363         struct nfsctl_export *data;
 364
 365         if (size < sizeof(*data))
 366                 return -EINVAL;
 367         data = (struct nfsctl_export*)buf;
 368         return exp_unexport(data);
 369 }
 370
 371 /**
 372  * write_getfs - Get a variable-length NFS file handle by path
 373  *
 374  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 375  * Function remains to support old versions of nfs-utils.
 376  *
 377  * Input:
 378  *                      buf:    struct nfsctl_fsparm
 379  *                              gd_addr:        socket address of client
 380  *                              gd_path:        '\0'-terminated C string
 381  *                                              containing pathname of
 382  *                                              directory in local file system
 383  *                              gd_maxlen:      maximum size of returned file
 384  *                                              handle
 385  *                      size:   size in bytes of passed in nfsctl_fsparm
 386  * Output:
 387  *      On success:     passed-in buffer filled with a knfsd_fh structure
 388  *                      (a variable-length raw NFS file handle);
 389  *                      return code is the size in bytes of the file handle
 390  *      On error:       return code is negative errno value
 391  *
 392  * Note: Only AF_INET client addresses are passed in, since gd_addr
 393  * is the same size as a struct sockaddr_in.
 394  */
 395 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 396 {
 397         struct nfsctl_fsparm *data;
 398         struct sockaddr_in *sin;
 399         struct auth_domain *clp;
 400         int err = 0;
 401         struct knfsd_fh *res;
 402         struct in6_addr in6;
 403
 404         if (size < sizeof(*data))
 405                 return -EINVAL;
 406         data = (struct nfsctl_fsparm*)buf;
 407         err = -EPROTONOSUPPORT;
 408         if (data->gd_addr.sa_family != AF_INET)
 409                 goto out;
 410         sin = (struct sockaddr_in *)&data->gd_addr;
 411         if (data->gd_maxlen > NFS3_FHSIZE)
 412                 data->gd_maxlen = NFS3_FHSIZE;
 413
 414         res = (struct knfsd_fh*)buf;
 415
 416         exp_readlock();
 417
 418         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 419
 420         clp = auth_unix_lookup(&init_net, &in6);
 421         if (!clp)
 422                 err = -EPERM;
 423         else {
 424                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 425                 auth_domain_put(clp);
 426         }
 427         exp_readunlock();
 428         if (err == 0)
 429                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 430  out:
 431         return err;
 432 }
 433
 434 /**
 435  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 436  *
 437  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 438  * Function remains to support old versions of nfs-utils.
 439  *
 440  * Input:
 441  *                      buf:    struct nfsctl_fdparm
 442  *                              gd_addr:        socket address of client
 443  *                              gd_path:        '\0'-terminated C string
 444  *                                              containing pathname of
 445  *                                              directory in local file system
 446  *                              gd_version:     fdparm structure version
 447  *                      size:   size in bytes of passed in nfsctl_fdparm
 448  * Output:
 449  *      On success:     passed-in buffer filled with nfsctl_res
 450  *                      (a fixed-length raw NFS file handle);
 451  *                      return code is the size in bytes of the file handle
 452  *      On error:       return code is negative errno value
 453  *
 454  * Note: Only AF_INET client addresses are passed in, since gd_addr
 455  * is the same size as a struct sockaddr_in.
 456  */
 457 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 458 {
 459         struct nfsctl_fdparm *data;
 460         struct sockaddr_in *sin;
 461         struct auth_domain *clp;
 462         int err = 0;
 463         struct knfsd_fh fh;
 464         char *res;
 465         struct in6_addr in6;
 466
 467         if (size < sizeof(*data))
 468                 return -EINVAL;
 469         data = (struct nfsctl_fdparm*)buf;
 470         err = -EPROTONOSUPPORT;
 471         if (data->gd_addr.sa_family != AF_INET)
 472                 goto out;
 473         err = -EINVAL;
 474         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 475                 goto out;
 476
 477         res = buf;
 478         sin = (struct sockaddr_in *)&data->gd_addr;
 479         exp_readlock();
 480
 481         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 482
 483         clp = auth_unix_lookup(&init_net, &in6);
 484         if (!clp)
 485                 err = -EPERM;
 486         else {
 487                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 488                 auth_domain_put(clp);
 489         }
 490         exp_readunlock();
 491
 492         if (err == 0) {
 493                 memset(res,0, NFS_FHSIZE);
 494                 memcpy(res, &fh.fh_base, fh.fh_size);
 495                 err = NFS_FHSIZE;
 496         }
 497  out:
 498         return err;
 499 }
 500 #endif /* CONFIG_NFSD_DEPRECATED */
 501
 502 /**
 503  * write_unlock_ip - Release all locks used by a client
 504  *
 505  * Experimental.
 506  *
 507  * Input:
 508  *                      buf:    '\n'-terminated C string containing a
 509  *                              presentation format IP address
 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_ip(struct file *file, char *buf, size_t size)
 517 {
 518         struct sockaddr_storage address;
 519         struct sockaddr *sap = (struct sockaddr *)&address;
 520         size_t salen = sizeof(address);
 521         char *fo_path;
 522
 523         /* sanity check */
 524         if (size == 0)
 525                 return -EINVAL;
 526
 527         if (buf[size-1] != '\n')
 528                 return -EINVAL;
 529
 530         fo_path = buf;
 531         if (qword_get(&buf, fo_path, size) < 0)
 532                 return -EINVAL;
 533
 534         if (rpc_pton(fo_path, size, sap, salen) == 0)
 535                 return -EINVAL;
 536
 537         return nlmsvc_unlock_all_by_ip(sap);
 538 }
 539
 540 /**
 541  * write_unlock_fs - Release all locks on a local file system
 542  *
 543  * Experimental.
 544  *
 545  * Input:
 546  *                      buf:    '\n'-terminated C string containing the
 547  *                              absolute pathname of a local file system
 548  *                      size:   length of C string in @buf
 549  * Output:
 550  *      On success:     returns zero if all specified locks were released;
 551  *                      returns one if one or more locks were not released
 552  *      On error:       return code is negative errno value
 553  */
 554 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 555 {
 556         struct path path;
 557         char *fo_path;
 558         int error;
 559
 560         /* sanity check */
 561         if (size == 0)
 562                 return -EINVAL;
 563
 564         if (buf[size-1] != '\n')
 565                 return -EINVAL;
 566
 567         fo_path = buf;
 568         if (qword_get(&buf, fo_path, size) < 0)
 569                 return -EINVAL;
 570
 571         error = kern_path(fo_path, 0, &path);
 572         if (error)
 573                 return error;
 574
 575         /*
 576          * XXX: Needs better sanity checking.  Otherwise we could end up
 577          * releasing locks on the wrong file system.
 578          *
 579          * For example:
 580          * 1.  Does the path refer to a directory?
 581          * 2.  Is that directory a mount point, or
 582          * 3.  Is that directory the root of an exported file system?
 583          */
 584         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 585
 586         path_put(&path);
 587         return error;
 588 }
 589
 590 /**
 591  * write_filehandle - Get a variable-length NFS file handle by path
 592  *
 593  * On input, the buffer contains a '\n'-terminated C string comprised of
 594  * three alphanumeric words separated by whitespace.  The string may
 595  * contain escape sequences.
 596  *
 597  * Input:
 598  *                      buf:
 599  *                              domain:         client domain name
 600  *                              path:           export pathname
 601  *                              maxsize:        numeric maximum size of
 602  *                                              @buf
 603  *                      size:   length of C string in @buf
 604  * Output:
 605  *      On success:     passed-in buffer filled with '\n'-terminated C
 606  *                      string containing a ASCII hex text version
 607  *                      of the NFS file handle;
 608  *                      return code is the size in bytes of the string
 609  *      On error:       return code is negative errno value
 610  */
 611 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 612 {
 613         char *dname, *path;
 614         int uninitialized_var(maxsize);
 615         char *mesg = buf;
 616         int len;
 617         struct auth_domain *dom;
 618         struct knfsd_fh fh;
 619
 620         if (size == 0)
 621                 return -EINVAL;
 622
 623         if (buf[size-1] != '\n')
 624                 return -EINVAL;
 625         buf[size-1] = 0;
 626
 627         dname = mesg;
 628         len = qword_get(&mesg, dname, size);
 629         if (len <= 0)
 630                 return -EINVAL;
 631
 632         path = dname+len+1;
 633         len = qword_get(&mesg, path, size);
 634         if (len <= 0)
 635                 return -EINVAL;
 636
 637         len = get_int(&mesg, &maxsize);
 638         if (len)
 639                 return len;
 640
 641         if (maxsize < NFS_FHSIZE)
 642                 return -EINVAL;
 643         if (maxsize > NFS3_FHSIZE)
 644                 maxsize = NFS3_FHSIZE;
 645
 646         if (qword_get(&mesg, mesg, size)>0)
 647                 return -EINVAL;
 648
 649         /* we have all the words, they are in buf.. */
 650         dom = unix_domain_find(dname);
 651         if (!dom)
 652                 return -ENOMEM;
 653
 654         len = exp_rootfh(dom, path, &fh,  maxsize);
 655         auth_domain_put(dom);
 656         if (len)
 657                 return len;
 658
 659         mesg = buf;
 660         len = SIMPLE_TRANSACTION_LIMIT;
 661         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 662         mesg[-1] = '\n';
 663         return mesg - buf;
 664 }
 665
 666 /**
 667  * write_threads - Start NFSD, or report the current number of running threads
 668  *
 669  * Input:
 670  *                      buf:            ignored
 671  *                      size:           zero
 672  * Output:
 673  *      On success:     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
 678  *
 679  * OR
 680  *
 681  * Input:
 682  *                      buf:            C string containing an unsigned
 683  *                                      integer value representing the
 684  *                                      number of NFSD threads to start
 685  *                      size:           non-zero length of C string in @buf
 686  * Output:
 687  *      On success:     NFS service is started;
 688  *                      passed-in buffer filled with '\n'-terminated C
 689  *                      string numeric value representing the number of
 690  *                      running NFSD threads;
 691  *                      return code is the size in bytes of the string
 692  *      On error:       return code is zero or a negative errno value
 693  */
 694 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 695 {
 696         char *mesg = buf;
 697         int rv;
 698         if (size > 0) {
 699                 int newthreads;
 700                 rv = get_int(&mesg, &newthreads);
 701                 if (rv)
 702                         return rv;
 703                 if (newthreads < 0)
 704                         return -EINVAL;
 705                 rv = nfsd_svc(NFS_PORT, newthreads);
 706                 if (rv < 0)
 707                         return rv;
 708         } else
 709                 rv = nfsd_nrthreads();
 710
 711         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 712 }
 713
 714 /**
 715  * write_pool_threads - Set or report the current number of threads per pool
 716  *
 717  * Input:
 718  *                      buf:            ignored
 719  *                      size:           zero
 720  *
 721  * OR
 722  *
 723  * Input:
 724  *                      buf:            C string containing whitespace-
 725  *                                      separated unsigned integer values
 726  *                                      representing the number of NFSD
 727  *                                      threads to start in each pool
 728  *                      size:           non-zero length of C string in @buf
 729  * Output:
 730  *      On success:     passed-in buffer filled with '\n'-terminated C
 731  *                      string containing integer values representing the
 732  *                      number of NFSD threads in each pool;
 733  *                      return code is the size in bytes of the string
 734  *      On error:       return code is zero or a negative errno value
 735  */
 736 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 737 {
 738         /* if size > 0, look for an array of number of threads per node
 739          * and apply them  then write out number of threads per node as reply
 740          */
 741         char *mesg = buf;
 742         int i;
 743         int rv;
 744         int len;
 745         int npools;
 746         int *nthreads;
 747
 748         mutex_lock(&nfsd_mutex);
 749         npools = nfsd_nrpools();
 750         if (npools == 0) {
 751                 /*
 752                  * NFS is shut down.  The admin can start it by
 753                  * writing to the threads file but NOT the pool_threads
 754                  * file, sorry.  Report zero threads.
 755                  */
 756                 mutex_unlock(&nfsd_mutex);
 757                 strcpy(buf, "0\n");
 758                 return strlen(buf);
 759         }
 760
 761         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 762         rv = -ENOMEM;
 763         if (nthreads == NULL)
 764                 goto out_free;
 765
 766         if (size > 0) {
 767                 for (i = 0; i < npools; i++) {
 768                         rv = get_int(&mesg, &nthreads[i]);
 769                         if (rv == -ENOENT)
 770                                 break;          /* fewer numbers than pools */
 771                         if (rv)
 772                                 goto out_free;  /* syntax error */
 773                         rv = -EINVAL;
 774                         if (nthreads[i] < 0)
 775                                 goto out_free;
 776                 }
 777                 rv = nfsd_set_nrthreads(i, nthreads);
 778                 if (rv)
 779                         goto out_free;
 780         }
 781
 782         rv = nfsd_get_nrthreads(npools, nthreads);
 783         if (rv)
 784                 goto out_free;
 785
 786         mesg = buf;
 787         size = SIMPLE_TRANSACTION_LIMIT;
 788         for (i = 0; i < npools && size > 0; i++) {
 789                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 790                 len = strlen(mesg);
 791                 size -= len;
 792                 mesg += len;
 793         }
 794         rv = mesg - buf;
 795 out_free:
 796         kfree(nthreads);
 797         mutex_unlock(&nfsd_mutex);
 798         return rv;
 799 }
 800
 801 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 802 {
 803         char *mesg = buf;
 804         char *vers, *minorp, sign;
 805         int len, num, remaining;
 806         unsigned minor;
 807         ssize_t tlen = 0;
 808         char *sep;
 809
 810         if (size>0) {
 811                 if (nfsd_serv)
 812                         /* Cannot change versions without updating
 813                          * nfsd_serv->sv_xdrsize, and reallocing
 814                          * rq_argp and rq_resp
 815                          */
 816                         return -EBUSY;
 817                 if (buf[size-1] != '\n')
 818                         return -EINVAL;
 819                 buf[size-1] = 0;
 820
 821                 vers = mesg;
 822                 len = qword_get(&mesg, vers, size);
 823                 if (len <= 0) return -EINVAL;
 824                 do {
 825                         sign = *vers;
 826                         if (sign == '+' || sign == '-')
 827                                 num = simple_strtol((vers+1), &minorp, 0);
 828                         else
 829                                 num = simple_strtol(vers, &minorp, 0);
 830                         if (*minorp == '.') {
 831                                 if (num < 4)
 832                                         return -EINVAL;
 833                                 minor = simple_strtoul(minorp+1, NULL, 0);
 834                                 if (minor == 0)
 835                                         return -EINVAL;
 836                                 if (nfsd_minorversion(minor, sign == '-' ?
 837                                                      NFSD_CLEAR : NFSD_SET) < 0)
 838                                         return -EINVAL;
 839                                 goto next;
 840                         }
 841                         switch(num) {
 842                         case 2:
 843                         case 3:
 844                         case 4:
 845                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 846                                 break;
 847                         default:
 848                                 return -EINVAL;
 849                         }
 850                 next:
 851                         vers += len + 1;
 852                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 853                 /* If all get turned off, turn them back on, as
 854                  * having no versions is BAD
 855                  */
 856                 nfsd_reset_versions();
 857         }
 858
 859         /* Now write current state into reply buffer */
 860         len = 0;
 861         sep = "";
 862         remaining = SIMPLE_TRANSACTION_LIMIT;
 863         for (num=2 ; num <= 4 ; num++)
 864                 if (nfsd_vers(num, NFSD_AVAIL)) {
 865                         len = snprintf(buf, remaining, "%s%c%d", sep,
 866                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 867                                        num);
 868                         sep = " ";
 869
 870                         if (len > remaining)
 871                                 break;
 872                         remaining -= len;
 873                         buf += len;
 874                         tlen += len;
 875                 }
 876         if (nfsd_vers(4, NFSD_AVAIL))
 877                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 878                      minor++) {
 879                         len = snprintf(buf, remaining, " %c4.%u",
 880                                         (nfsd_vers(4, NFSD_TEST) &&
 881                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 882                                                 '+' : '-',
 883                                         minor);
 884
 885                         if (len > remaining)
 886                                 break;
 887                         remaining -= len;
 888                         buf += len;
 889                         tlen += len;
 890                 }
 891
 892         len = snprintf(buf, remaining, "\n");
 893         if (len > remaining)
 894                 return -EINVAL;
 895         return tlen + len;
 896 }
 897
 898 /**
 899  * write_versions - Set or report the available NFS protocol versions
 900  *
 901  * Input:
 902  *                      buf:            ignored
 903  *                      size:           zero
 904  * Output:
 905  *      On success:     passed-in buffer filled with '\n'-terminated C
 906  *                      string containing positive or negative integer
 907  *                      values representing the current status of each
 908  *                      protocol version;
 909  *                      return code is the size in bytes of the string
 910  *      On error:       return code is zero or a negative errno value
 911  *
 912  * OR
 913  *
 914  * Input:
 915  *                      buf:            C string containing whitespace-
 916  *                                      separated positive or negative
 917  *                                      integer values representing NFS
 918  *                                      protocol versions to enable ("+n")
 919  *                                      or disable ("-n")
 920  *                      size:           non-zero length of C string in @buf
 921  * Output:
 922  *      On success:     status of zero or more protocol versions has
 923  *                      been updated; passed-in buffer filled with
 924  *                      '\n'-terminated C string containing positive
 925  *                      or negative integer values representing the
 926  *                      current status of each protocol version;
 927  *                      return code is the size in bytes of the string
 928  *      On error:       return code is zero or a negative errno value
 929  */
 930 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 931 {
 932         ssize_t rv;
 933
 934         mutex_lock(&nfsd_mutex);
 935         rv = __write_versions(file, buf, size);
 936         mutex_unlock(&nfsd_mutex);
 937         return rv;
 938 }
 939
 940 /*
 941  * Zero-length write.  Return a list of NFSD's current listener
 942  * transports.
 943  */
 944 static ssize_t __write_ports_names(char *buf)
 945 {
 946         if (nfsd_serv == NULL)
 947                 return 0;
 948         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 949 }
 950
 951 /*
 952  * A single 'fd' number was written, in which case it must be for
 953  * a socket of a supported family/protocol, and we use it as an
 954  * nfsd listener.
 955  */
 956 static ssize_t __write_ports_addfd(char *buf)
 957 {
 958         char *mesg = buf;
 959         int fd, err;
 960
 961         err = get_int(&mesg, &fd);
 962         if (err != 0 || fd < 0)
 963                 return -EINVAL;
 964
 965         err = nfsd_create_serv();
 966         if (err != 0)
 967                 return err;
 968
 969         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 970         if (err < 0) {
 971                 svc_destroy(nfsd_serv);
 972                 return err;
 973         }
 974
 975         /* Decrease the count, but don't shut down the service */
 976         nfsd_serv->sv_nrthreads--;
 977         return err;
 978 }
 979
 980 /*
 981  * A '-' followed by the 'name' of a socket means we close the socket.
 982  */
 983 static ssize_t __write_ports_delfd(char *buf)
 984 {
 985         char *toclose;
 986         int len = 0;
 987
 988         toclose = kstrdup(buf + 1, GFP_KERNEL);
 989         if (toclose == NULL)
 990                 return -ENOMEM;
 991
 992         if (nfsd_serv != NULL)
 993                 len = svc_sock_names(nfsd_serv, buf,
 994                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 995         kfree(toclose);
 996         return len;
 997 }
 998
 999 /*
1000  * A transport listener is added by writing it's transport name and
1001  * a port number.
1002  */
1003 static ssize_t __write_ports_addxprt(char *buf)
1004 {
1005         char transport[16];
1006         struct svc_xprt *xprt;
1007         int port, err;
1008
1009         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1010                 return -EINVAL;
1011
1012         if (port < 1 || port > USHRT_MAX)
1013                 return -EINVAL;
1014
1015         err = nfsd_create_serv();
1016         if (err != 0)
1017                 return err;
1018
1019         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1020                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1021         if (err < 0)
1022                 goto out_err;
1023
1024         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1025                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1026         if (err < 0 && err != -EAFNOSUPPORT)
1027                 goto out_close;
1028
1029         /* Decrease the count, but don't shut down the service */
1030         nfsd_serv->sv_nrthreads--;
1031         return 0;
1032 out_close:
1033         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1034         if (xprt != NULL) {
1035                 svc_close_xprt(xprt);
1036                 svc_xprt_put(xprt);
1037         }
1038 out_err:
1039         svc_destroy(nfsd_serv);
1040         return err;
1041 }
1042
1043 /*
1044  * A transport listener is removed by writing a "-", it's transport
1045  * name, and it's port number.
1046  */
1047 static ssize_t __write_ports_delxprt(char *buf)
1048 {
1049         struct svc_xprt *xprt;
1050         char transport[16];
1051         int port;
1052
1053         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1054                 return -EINVAL;
1055
1056         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1057                 return -EINVAL;
1058
1059         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1060         if (xprt == NULL)
1061                 return -ENOTCONN;
1062
1063         svc_close_xprt(xprt);
1064         svc_xprt_put(xprt);
1065         return 0;
1066 }
1067
1068 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1069 {
1070         if (size == 0)
1071                 return __write_ports_names(buf);
1072
1073         if (isdigit(buf[0]))
1074                 return __write_ports_addfd(buf);
1075
1076         if (buf[0] == '-' && isdigit(buf[1]))
1077                 return __write_ports_delfd(buf);
1078
1079         if (isalpha(buf[0]))
1080                 return __write_ports_addxprt(buf);
1081
1082         if (buf[0] == '-' && isalpha(buf[1]))
1083                 return __write_ports_delxprt(buf);
1084
1085         return -EINVAL;
1086 }
1087
1088 /**
1089  * write_ports - Pass a socket file descriptor or transport name to listen on
1090  *
1091  * Input:
1092  *                      buf:            ignored
1093  *                      size:           zero
1094  * Output:
1095  *      On success:     passed-in buffer filled with a '\n'-terminated C
1096  *                      string containing a whitespace-separated list of
1097  *                      named NFSD listeners;
1098  *                      return code is the size in bytes of the string
1099  *      On error:       return code is zero or a negative errno value
1100  *
1101  * OR
1102  *
1103  * Input:
1104  *                      buf:            C string containing an unsigned
1105  *                                      integer value representing a bound
1106  *                                      but unconnected socket that is to be
1107  *                                      used as an NFSD listener; listen(3)
1108  *                                      must be called for a SOCK_STREAM
1109  *                                      socket, otherwise it is ignored
1110  *                      size:           non-zero length of C string in @buf
1111  * Output:
1112  *      On success:     NFS service is started;
1113  *                      passed-in buffer filled with a '\n'-terminated C
1114  *                      string containing a unique alphanumeric name of
1115  *                      the listener;
1116  *                      return code is the size in bytes of the string
1117  *      On error:       return code is a negative errno value
1118  *
1119  * OR
1120  *
1121  * Input:
1122  *                      buf:            C string containing a "-" followed
1123  *                                      by an integer value representing a
1124  *                                      previously passed in socket file
1125  *                                      descriptor
1126  *                      size:           non-zero length of C string in @buf
1127  * Output:
1128  *      On success:     NFS service no longer listens on that socket;
1129  *                      passed-in buffer filled with a '\n'-terminated C
1130  *                      string containing a unique name of the listener;
1131  *                      return code is the size in bytes of the string
1132  *      On error:       return code is a negative errno value
1133  *
1134  * OR
1135  *
1136  * Input:
1137  *                      buf:            C string containing a transport
1138  *                                      name and an unsigned integer value
1139  *                                      representing the port to listen on,
1140  *                                      separated by whitespace
1141  *                      size:           non-zero length of C string in @buf
1142  * Output:
1143  *      On success:     returns zero; NFS service is started
1144  *      On error:       return code is a negative errno value
1145  *
1146  * OR
1147  *
1148  * Input:
1149  *                      buf:            C string containing a "-" followed
1150  *                                      by a transport name and an unsigned
1151  *                                      integer value representing the port
1152  *                                      to listen on, separated by whitespace
1153  *                      size:           non-zero length of C string in @buf
1154  * Output:
1155  *      On success:     returns zero; NFS service no longer listens
1156  *                      on that transport
1157  *      On error:       return code is a negative errno value
1158  */
1159 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1160 {
1161         ssize_t rv;
1162
1163         mutex_lock(&nfsd_mutex);
1164         rv = __write_ports(file, buf, size);
1165         mutex_unlock(&nfsd_mutex);
1166         return rv;
1167 }
1168
1169
1170 int nfsd_max_blksize;
1171
1172 /**
1173  * write_maxblksize - Set or report the current NFS blksize
1174  *
1175  * Input:
1176  *                      buf:            ignored
1177  *                      size:           zero
1178  *
1179  * OR
1180  *
1181  * Input:
1182  *                      buf:            C string containing an unsigned
1183  *                                      integer value representing the new
1184  *                                      NFS blksize
1185  *                      size:           non-zero length of C string in @buf
1186  * Output:
1187  *      On success:     passed-in buffer filled with '\n'-terminated C string
1188  *                      containing numeric value of the current NFS blksize
1189  *                      setting;
1190  *                      return code is the size in bytes of the string
1191  *      On error:       return code is zero or a negative errno value
1192  */
1193 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1194 {
1195         char *mesg = buf;
1196         if (size > 0) {
1197                 int bsize;
1198                 int rv = get_int(&mesg, &bsize);
1199                 if (rv)
1200                         return rv;
1201                 /* force bsize into allowed range and
1202                  * required alignment.
1203                  */
1204                 if (bsize < 1024)
1205                         bsize = 1024;
1206                 if (bsize > NFSSVC_MAXBLKSIZE)
1207                         bsize = NFSSVC_MAXBLKSIZE;
1208                 bsize &= ~(1024-1);
1209                 mutex_lock(&nfsd_mutex);
1210                 if (nfsd_serv) {
1211                         mutex_unlock(&nfsd_mutex);
1212                         return -EBUSY;
1213                 }
1214                 nfsd_max_blksize = bsize;
1215                 mutex_unlock(&nfsd_mutex);
1216         }
1217
1218         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1219                                                         nfsd_max_blksize);
1220 }
1221
1222 #ifdef CONFIG_NFSD_V4
1223 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1224 {
1225         char *mesg = buf;
1226         int rv, i;
1227
1228         if (size > 0) {
1229                 if (nfsd_serv)
1230                         return -EBUSY;
1231                 rv = get_int(&mesg, &i);
1232                 if (rv)
1233                         return rv;
1234                 /*
1235                  * Some sanity checking.  We don't have a reason for
1236                  * these particular numbers, but problems with the
1237                  * extremes are:
1238                  *      - Too short: the briefest network outage may
1239                  *        cause clients to lose all their locks.  Also,
1240                  *        the frequent polling may be wasteful.
1241                  *      - Too long: do you really want reboot recovery
1242                  *        to take more than an hour?  Or to make other
1243                  *        clients wait an hour before being able to
1244                  *        revoke a dead client's locks?
1245                  */
1246                 if (i < 10 || i > 3600)
1247                         return -EINVAL;
1248                 *time = i;
1249         }
1250
1251         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1252 }
1253
1254 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1255 {
1256         ssize_t rv;
1257
1258         mutex_lock(&nfsd_mutex);
1259         rv = __nfsd4_write_time(file, buf, size, time);
1260         mutex_unlock(&nfsd_mutex);
1261         return rv;
1262 }
1263
1264 /**
1265  * write_leasetime - Set or report the current NFSv4 lease time
1266  *
1267  * Input:
1268  *                      buf:            ignored
1269  *                      size:           zero
1270  *
1271  * OR
1272  *
1273  * Input:
1274  *                      buf:            C string containing an unsigned
1275  *                                      integer value representing the new
1276  *                                      NFSv4 lease expiry time
1277  *                      size:           non-zero length of C string in @buf
1278  * Output:
1279  *      On success:     passed-in buffer filled with '\n'-terminated C
1280  *                      string containing unsigned integer value of the
1281  *                      current lease expiry time;
1282  *                      return code is the size in bytes of the string
1283  *      On error:       return code is zero or a negative errno value
1284  */
1285 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1286 {
1287         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1288 }
1289
1290 /**
1291  * write_gracetime - Set or report current NFSv4 grace period time
1292  *
1293  * As above, but sets the time of the NFSv4 grace period.
1294  *
1295  * Note this should never be set to less than the *previous*
1296  * lease-period time, but we don't try to enforce this.  (In the common
1297  * case (a new boot), we don't know what the previous lease time was
1298  * anyway.)
1299  */
1300 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1301 {
1302         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1303 }
1304
1305 extern char *nfs4_recoverydir(void);
1306
1307 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1308 {
1309         char *mesg = buf;
1310         char *recdir;
1311         int len, status;
1312
1313         if (size > 0) {
1314                 if (nfsd_serv)
1315                         return -EBUSY;
1316                 if (size > PATH_MAX || buf[size-1] != '\n')
1317                         return -EINVAL;
1318                 buf[size-1] = 0;
1319
1320                 recdir = mesg;
1321                 len = qword_get(&mesg, recdir, size);
1322                 if (len <= 0)
1323                         return -EINVAL;
1324
1325                 status = nfs4_reset_recoverydir(recdir);
1326                 if (status)
1327                         return status;
1328         }
1329
1330         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1331                                                         nfs4_recoverydir());
1332 }
1333
1334 /**
1335  * write_recoverydir - Set or report the pathname of the recovery directory
1336  *
1337  * Input:
1338  *                      buf:            ignored
1339  *                      size:           zero
1340  *
1341  * OR
1342  *
1343  * Input:
1344  *                      buf:            C string containing the pathname
1345  *                                      of the directory on a local file
1346  *                                      system containing permanent NFSv4
1347  *                                      recovery data
1348  *                      size:           non-zero length of C string in @buf
1349  * Output:
1350  *      On success:     passed-in buffer filled with '\n'-terminated C string
1351  *                      containing the current recovery pathname setting;
1352  *                      return code is the size in bytes of the string
1353  *      On error:       return code is zero or a negative errno value
1354  */
1355 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1356 {
1357         ssize_t rv;
1358
1359         mutex_lock(&nfsd_mutex);
1360         rv = __write_recoverydir(file, buf, size);
1361         mutex_unlock(&nfsd_mutex);
1362         return rv;
1363 }
1364
1365 #endif
1366
1367 /*----------------------------------------------------------------------------*/
1368 /*
1369  *      populating the filesystem.
1370  */
1371
1372 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1373 {
1374         static struct tree_descr nfsd_files[] = {
1375 #ifdef CONFIG_NFSD_DEPRECATED
1376                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1377                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1378                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1379                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1380                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1381                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1382                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1383 #endif
1384                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1385                 [NFSD_Export_features] = {"export_features",
1386                                         &export_features_operations, S_IRUGO},
1387                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1388                                         &transaction_ops, S_IWUSR|S_IRUSR},
1389                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1390                                         &transaction_ops, S_IWUSR|S_IRUSR},
1391                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1392                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1393                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1394                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1395                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1396                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1397                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1398 #ifdef CONFIG_NFSD_V4
1399                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1400                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1401                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1402 #endif
1403                 /* last one */ {""}
1404         };
1405         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1406 }
1407
1408 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1409         int flags, const char *dev_name, void *data)
1410 {
1411         return mount_single(fs_type, flags, data, nfsd_fill_super);
1412 }
1413
1414 static struct file_system_type nfsd_fs_type = {
1415         .owner          = THIS_MODULE,
1416         .name           = "nfsd",
1417         .mount          = nfsd_mount,
1418         .kill_sb        = kill_litter_super,
1419 };
1420
1421 #ifdef CONFIG_PROC_FS
1422 static int create_proc_exports_entry(void)
1423 {
1424         struct proc_dir_entry *entry;
1425
1426         entry = proc_mkdir("fs/nfs", NULL);
1427         if (!entry)
1428                 return -ENOMEM;
1429         entry = proc_create("exports", 0, entry, &exports_operations);
1430         if (!entry)
1431                 return -ENOMEM;
1432         return 0;
1433 }
1434 #else /* CONFIG_PROC_FS */
1435 static int create_proc_exports_entry(void)
1436 {
1437         return 0;
1438 }
1439 #endif
1440
1441 static int __init init_nfsd(void)
1442 {
1443         int retval;
1444         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 [email protected]).\n");
1445
1446         retval = nfs4_state_init(); /* nfs4 locking state */
1447         if (retval)
1448                 return retval;
1449         nfsd_stat_init();       /* Statistics */
1450         retval = nfsd_reply_cache_init();
1451         if (retval)
1452                 goto out_free_stat;
1453         retval = nfsd_export_init();
1454         if (retval)
1455                 goto out_free_cache;
1456         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1457         retval = nfsd_idmap_init();
1458         if (retval)
1459                 goto out_free_lockd;
1460         retval = create_proc_exports_entry();
1461         if (retval)
1462                 goto out_free_idmap;
1463         retval = register_filesystem(&nfsd_fs_type);
1464         if (retval)
1465                 goto out_free_all;
1466         return 0;
1467 out_free_all:
1468         remove_proc_entry("fs/nfs/exports", NULL);
1469         remove_proc_entry("fs/nfs", NULL);
1470 out_free_idmap:
1471         nfsd_idmap_shutdown();
1472 out_free_lockd:
1473         nfsd_lockd_shutdown();
1474         nfsd_export_shutdown();
1475 out_free_cache:
1476         nfsd_reply_cache_shutdown();
1477 out_free_stat:
1478         nfsd_stat_shutdown();
1479         nfsd4_free_slabs();
1480         return retval;
1481 }
1482
1483 static void __exit exit_nfsd(void)
1484 {
1485         nfsd_export_shutdown();
1486         nfsd_reply_cache_shutdown();
1487         remove_proc_entry("fs/nfs/exports", NULL);
1488         remove_proc_entry("fs/nfs", NULL);
1489         nfsd_stat_shutdown();
1490         nfsd_lockd_shutdown();
1491         nfsd_idmap_shutdown();
1492         nfsd4_free_slabs();
1493         unregister_filesystem(&nfsd_fs_type);
1494 }
1495
1496 MODULE_AUTHOR("Olaf Kirch <[email protected]>");
1497 MODULE_LICENSE("GPL");
1498 module_init(init_nfsd)
1499 module_exit(exit_nfsd)