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