fs/nfsd/nfsctl.c

   1 /*
   2  * Syscall interface to knfsd.
   3  *
   4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/namei.h>
   9 #include <linux/ctype.h>
  10
  11 #include <linux/sunrpc/svcsock.h>
  12 #include <linux/nfsd/syscall.h>
  13 #include <linux/lockd/lockd.h>
  14 #include <linux/sunrpc/clnt.h>
  15 #include <linux/sunrpc/gss_api.h>
  16 #include <linux/sunrpc/gss_krb5_enctypes.h>
  17
  18 #include "idmap.h"
  19 #include "nfsd.h"
  20 #include "cache.h"
  21
  22 /*
  23  *      We have a single directory with several nodes in it.
  24  */
  25 enum {
  26         NFSD_Root = 1,
  27 #ifdef CONFIG_NFSD_DEPRECATED
  28         NFSD_Svc,
  29         NFSD_Add,
  30         NFSD_Del,
  31         NFSD_Export,
  32         NFSD_Unexport,
  33         NFSD_Getfd,
  34         NFSD_Getfs,
  35 #endif
  36         NFSD_List,
  37         NFSD_Export_features,
  38         NFSD_Fh,
  39         NFSD_FO_UnlockIP,
  40         NFSD_FO_UnlockFS,
  41         NFSD_Threads,
  42         NFSD_Pool_Threads,
  43         NFSD_Pool_Stats,
  44         NFSD_Versions,
  45         NFSD_Ports,
  46         NFSD_MaxBlkSize,
  47         NFSD_SupportedEnctypes,
  48         /*
  49          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  50          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  51          */
  52 #ifdef CONFIG_NFSD_V4
  53         NFSD_Leasetime,
  54         NFSD_Gracetime,
  55         NFSD_RecoveryDir,
  56 #endif
  57 };
  58
  59 /*
  60  * write() for these nodes.
  61  */
  62 #ifdef CONFIG_NFSD_DEPRECATED
  63 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  64 static ssize_t write_add(struct file *file, char *buf, size_t size);
  65 static ssize_t write_del(struct file *file, char *buf, size_t size);
  66 static ssize_t write_export(struct file *file, char *buf, size_t size);
  67 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  68 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  69 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  70 #endif
  71 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  72 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  73 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  74 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  75 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  76 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  77 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  78 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  79 #ifdef CONFIG_NFSD_V4
  80 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  81 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  82 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  83 #endif
  84
  85 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  86 #ifdef CONFIG_NFSD_DEPRECATED
  87         [NFSD_Svc] = write_svc,
  88         [NFSD_Add] = write_add,
  89         [NFSD_Del] = write_del,
  90         [NFSD_Export] = write_export,
  91         [NFSD_Unexport] = write_unexport,
  92         [NFSD_Getfd] = write_getfd,
  93         [NFSD_Getfs] = write_getfs,
  94 #endif
  95         [NFSD_Fh] = write_filehandle,
  96         [NFSD_FO_UnlockIP] = write_unlock_ip,
  97         [NFSD_FO_UnlockFS] = write_unlock_fs,
  98         [NFSD_Threads] = write_threads,
  99         [NFSD_Pool_Threads] = write_pool_threads,
 100         [NFSD_Versions] = write_versions,
 101         [NFSD_Ports] = write_ports,
 102         [NFSD_MaxBlkSize] = write_maxblksize,
 103 #ifdef CONFIG_NFSD_V4
 104         [NFSD_Leasetime] = write_leasetime,
 105         [NFSD_Gracetime] = write_gracetime,
 106         [NFSD_RecoveryDir] = write_recoverydir,
 107 #endif
 108 };
 109
 110 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 111 {
 112         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 113         char *data;
 114         ssize_t rv;
 115
 116         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 117                 return -EINVAL;
 118
 119         data = simple_transaction_get(file, buf, size);
 120         if (IS_ERR(data))
 121                 return PTR_ERR(data);
 122
 123         rv =  write_op[ino](file, data, size);
 124         if (rv >= 0) {
 125                 simple_transaction_set(file, rv);
 126                 rv = size;
 127         }
 128         return rv;
 129 }
 130
 131 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 132 {
 133 #ifdef CONFIG_NFSD_DEPRECATED
 134         static int warned;
 135         if (file->f_dentry->d_name.name[0] == '.' && !warned) {
 136                 printk(KERN_INFO
 137                        "Warning: \"%s\" uses deprecated NFSD interface: %s."
 138                        "  This will be removed in 2.6.40\n",
 139                        current->comm, file->f_dentry->d_name.name);
 140                 warned = 1;
 141         }
 142 #endif
 143         if (! file->private_data) {
 144                 /* An attempt to read a transaction file without writing
 145                  * causes a 0-byte write so that the file can return
 146                  * state information
 147                  */
 148                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 149                 if (rv < 0)
 150                         return rv;
 151         }
 152         return simple_transaction_read(file, buf, size, pos);
 153 }
 154
 155 static const struct file_operations transaction_ops = {
 156         .write          = nfsctl_transaction_write,
 157         .read           = nfsctl_transaction_read,
 158         .release        = simple_transaction_release,
 159         .llseek         = default_llseek,
 160 };
 161
 162 static int exports_open(struct inode *inode, struct file *file)
 163 {
 164         return seq_open(file, &nfs_exports_op);
 165 }
 166
 167 static const struct file_operations exports_operations = {
 168         .open           = exports_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = seq_release,
 172         .owner          = THIS_MODULE,
 173 };
 174
 175 static int export_features_show(struct seq_file *m, void *v)
 176 {
 177         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 178         return 0;
 179 }
 180
 181 static int export_features_open(struct inode *inode, struct file *file)
 182 {
 183         return single_open(file, export_features_show, NULL);
 184 }
 185
 186 static struct file_operations export_features_operations = {
 187         .open           = export_features_open,
 188         .read           = seq_read,
 189         .llseek         = seq_lseek,
 190         .release        = single_release,
 191 };
 192
 193 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 194 static int supported_enctypes_show(struct seq_file *m, void *v)
 195 {
 196         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 197         return 0;
 198 }
 199
 200 static int supported_enctypes_open(struct inode *inode, struct file *file)
 201 {
 202         return single_open(file, supported_enctypes_show, NULL);
 203 }
 204
 205 static struct file_operations supported_enctypes_ops = {
 206         .open           = supported_enctypes_open,
 207         .read           = seq_read,
 208         .llseek         = seq_lseek,
 209         .release        = single_release,
 210 };
 211 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 212
 213 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 214 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 215
 216 static const struct file_operations pool_stats_operations = {
 217         .open           = nfsd_pool_stats_open,
 218         .read           = seq_read,
 219         .llseek         = seq_lseek,
 220         .release        = nfsd_pool_stats_release,
 221         .owner          = THIS_MODULE,
 222 };
 223
 224 /*----------------------------------------------------------------------------*/
 225 /*
 226  * payload - write methods
 227  */
 228
 229 #ifdef CONFIG_NFSD_DEPRECATED
 230 /**
 231  * write_svc - Start kernel's NFSD server
 232  *
 233  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 234  * Function remains to support old versions of nfs-utils.
 235  *
 236  * Input:
 237  *                      buf:    struct nfsctl_svc
 238  *                              svc_port:       port number of this
 239  *                                              server's listener
 240  *                              svc_nthreads:   number of threads to start
 241  *                      size:   size in bytes of passed in nfsctl_svc
 242  * Output:
 243  *      On success:     returns zero
 244  *      On error:       return code is negative errno value
 245  */
 246 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 247 {
 248         struct nfsctl_svc *data;
 249         int err;
 250         if (size < sizeof(*data))
 251                 return -EINVAL;
 252         data = (struct nfsctl_svc*) buf;
 253         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 254         if (err < 0)
 255                 return err;
 256         return 0;
 257 }
 258
 259 /**
 260  * write_add - Add or modify client entry in auth unix cache
 261  *
 262  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 263  * Function remains to support old versions of nfs-utils.
 264  *
 265  * Input:
 266  *                      buf:    struct nfsctl_client
 267  *                              cl_ident:       '\0'-terminated C string
 268  *                                              containing domain name
 269  *                                              of client
 270  *                              cl_naddr:       no. of items in cl_addrlist
 271  *                              cl_addrlist:    array of client addresses
 272  *                              cl_fhkeytype:   ignored
 273  *                              cl_fhkeylen:    ignored
 274  *                              cl_fhkey:       ignored
 275  *                      size:   size in bytes of passed in nfsctl_client
 276  * Output:
 277  *      On success:     returns zero
 278  *      On error:       return code is negative errno value
 279  *
 280  * Note: Only AF_INET client addresses are passed in, since
 281  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 282  */
 283 static ssize_t write_add(struct file *file, char *buf, size_t size)
 284 {
 285         struct nfsctl_client *data;
 286         if (size < sizeof(*data))
 287                 return -EINVAL;
 288         data = (struct nfsctl_client *)buf;
 289         return exp_addclient(data);
 290 }
 291
 292 /**
 293  * write_del - Remove client from auth unix cache
 294  *
 295  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 296  * Function remains to support old versions of nfs-utils.
 297  *
 298  * Input:
 299  *                      buf:    struct nfsctl_client
 300  *                              cl_ident:       '\0'-terminated C string
 301  *                                              containing domain name
 302  *                                              of client
 303  *                              cl_naddr:       ignored
 304  *                              cl_addrlist:    ignored
 305  *                              cl_fhkeytype:   ignored
 306  *                              cl_fhkeylen:    ignored
 307  *                              cl_fhkey:       ignored
 308  *                      size:   size in bytes of passed in nfsctl_client
 309  * Output:
 310  *      On success:     returns zero
 311  *      On error:       return code is negative errno value
 312  *
 313  * Note: Only AF_INET client addresses are passed in, since
 314  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 315  */
 316 static ssize_t write_del(struct file *file, char *buf, size_t size)
 317 {
 318         struct nfsctl_client *data;
 319         if (size < sizeof(*data))
 320                 return -EINVAL;
 321         data = (struct nfsctl_client *)buf;
 322         return exp_delclient(data);
 323 }
 324
 325 /**
 326  * write_export - Export part or all of a local file system
 327  *
 328  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 329  * Function remains to support old versions of nfs-utils.
 330  *
 331  * Input:
 332  *                      buf:    struct nfsctl_export
 333  *                              ex_client:      '\0'-terminated C string
 334  *                                              containing domain name
 335  *                                              of client allowed to access
 336  *                                              this export
 337  *                              ex_path:        '\0'-terminated C string
 338  *                                              containing pathname of
 339  *                                              directory in local file system
 340  *                              ex_dev:         fsid to use for this export
 341  *                              ex_ino:         ignored
 342  *                              ex_flags:       export flags for this export
 343  *                              ex_anon_uid:    UID to use for anonymous
 344  *                                              requests
 345  *                              ex_anon_gid:    GID to use for anonymous
 346  *                                              requests
 347  *                      size:   size in bytes of passed in nfsctl_export
 348  * Output:
 349  *      On success:     returns zero
 350  *      On error:       return code is negative errno value
 351  */
 352 static ssize_t write_export(struct file *file, char *buf, size_t size)
 353 {
 354         struct nfsctl_export *data;
 355         if (size < sizeof(*data))
 356                 return -EINVAL;
 357         data = (struct nfsctl_export*)buf;
 358         return exp_export(data);
 359 }
 360
 361 /**
 362  * write_unexport - Unexport a previously exported file system
 363  *
 364  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 365  * Function remains to support old versions of nfs-utils.
 366  *
 367  * Input:
 368  *                      buf:    struct nfsctl_export
 369  *                              ex_client:      '\0'-terminated C string
 370  *                                              containing domain name
 371  *                                              of client no longer allowed
 372  *                                              to access this export
 373  *                              ex_path:        '\0'-terminated C string
 374  *                                              containing pathname of
 375  *                                              directory in local file system
 376  *                              ex_dev:         ignored
 377  *                              ex_ino:         ignored
 378  *                              ex_flags:       ignored
 379  *                              ex_anon_uid:    ignored
 380  *                              ex_anon_gid:    ignored
 381  *                      size:   size in bytes of passed in nfsctl_export
 382  * Output:
 383  *      On success:     returns zero
 384  *      On error:       return code is negative errno value
 385  */
 386 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 387 {
 388         struct nfsctl_export *data;
 389
 390         if (size < sizeof(*data))
 391                 return -EINVAL;
 392         data = (struct nfsctl_export*)buf;
 393         return exp_unexport(data);
 394 }
 395
 396 /**
 397  * write_getfs - Get a variable-length NFS file handle by path
 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_fsparm
 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_maxlen:      maximum size of returned file
 409  *                                              handle
 410  *                      size:   size in bytes of passed in nfsctl_fsparm
 411  * Output:
 412  *      On success:     passed-in buffer filled with a knfsd_fh structure
 413  *                      (a variable-length raw NFS file handle);
 414  *                      return code is the size in bytes of the file handle
 415  *      On error:       return code is negative errno value
 416  *
 417  * Note: Only AF_INET client addresses are passed in, since gd_addr
 418  * is the same size as a struct sockaddr_in.
 419  */
 420 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 421 {
 422         struct nfsctl_fsparm *data;
 423         struct sockaddr_in *sin;
 424         struct auth_domain *clp;
 425         int err = 0;
 426         struct knfsd_fh *res;
 427         struct in6_addr in6;
 428
 429         if (size < sizeof(*data))
 430                 return -EINVAL;
 431         data = (struct nfsctl_fsparm*)buf;
 432         err = -EPROTONOSUPPORT;
 433         if (data->gd_addr.sa_family != AF_INET)
 434                 goto out;
 435         sin = (struct sockaddr_in *)&data->gd_addr;
 436         if (data->gd_maxlen > NFS3_FHSIZE)
 437                 data->gd_maxlen = NFS3_FHSIZE;
 438
 439         res = (struct knfsd_fh*)buf;
 440
 441         exp_readlock();
 442
 443         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 444
 445         clp = auth_unix_lookup(&init_net, &in6);
 446         if (!clp)
 447                 err = -EPERM;
 448         else {
 449                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 450                 auth_domain_put(clp);
 451         }
 452         exp_readunlock();
 453         if (err == 0)
 454                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 455  out:
 456         return err;
 457 }
 458
 459 /**
 460  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 461  *
 462  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 463  * Function remains to support old versions of nfs-utils.
 464  *
 465  * Input:
 466  *                      buf:    struct nfsctl_fdparm
 467  *                              gd_addr:        socket address of client
 468  *                              gd_path:        '\0'-terminated C string
 469  *                                              containing pathname of
 470  *                                              directory in local file system
 471  *                              gd_version:     fdparm structure version
 472  *                      size:   size in bytes of passed in nfsctl_fdparm
 473  * Output:
 474  *      On success:     passed-in buffer filled with nfsctl_res
 475  *                      (a fixed-length raw NFS file handle);
 476  *                      return code is the size in bytes of the file handle
 477  *      On error:       return code is negative errno value
 478  *
 479  * Note: Only AF_INET client addresses are passed in, since gd_addr
 480  * is the same size as a struct sockaddr_in.
 481  */
 482 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 483 {
 484         struct nfsctl_fdparm *data;
 485         struct sockaddr_in *sin;
 486         struct auth_domain *clp;
 487         int err = 0;
 488         struct knfsd_fh fh;
 489         char *res;
 490         struct in6_addr in6;
 491
 492         if (size < sizeof(*data))
 493                 return -EINVAL;
 494         data = (struct nfsctl_fdparm*)buf;
 495         err = -EPROTONOSUPPORT;
 496         if (data->gd_addr.sa_family != AF_INET)
 497                 goto out;
 498         err = -EINVAL;
 499         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 500                 goto out;
 501
 502         res = buf;
 503         sin = (struct sockaddr_in *)&data->gd_addr;
 504         exp_readlock();
 505
 506         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 507
 508         clp = auth_unix_lookup(&init_net, &in6);
 509         if (!clp)
 510                 err = -EPERM;
 511         else {
 512                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 513                 auth_domain_put(clp);
 514         }
 515         exp_readunlock();
 516
 517         if (err == 0) {
 518                 memset(res,0, NFS_FHSIZE);
 519                 memcpy(res, &fh.fh_base, fh.fh_size);
 520                 err = NFS_FHSIZE;
 521         }
 522  out:
 523         return err;
 524 }
 525 #endif /* CONFIG_NFSD_DEPRECATED */
 526
 527 /**
 528  * write_unlock_ip - Release all locks used by a client
 529  *
 530  * Experimental.
 531  *
 532  * Input:
 533  *                      buf:    '\n'-terminated C string containing a
 534  *                              presentation format IP address
 535  *                      size:   length of C string in @buf
 536  * Output:
 537  *      On success:     returns zero if all specified locks were released;
 538  *                      returns one if one or more locks were not released
 539  *      On error:       return code is negative errno value
 540  */
 541 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 542 {
 543         struct sockaddr_storage address;
 544         struct sockaddr *sap = (struct sockaddr *)&address;
 545         size_t salen = sizeof(address);
 546         char *fo_path;
 547
 548         /* sanity check */
 549         if (size == 0)
 550                 return -EINVAL;
 551
 552         if (buf[size-1] != '\n')
 553                 return -EINVAL;
 554
 555         fo_path = buf;
 556         if (qword_get(&buf, fo_path, size) < 0)
 557                 return -EINVAL;
 558
 559         if (rpc_pton(fo_path, size, sap, salen) == 0)
 560                 return -EINVAL;
 561
 562         return nlmsvc_unlock_all_by_ip(sap);
 563 }
 564
 565 /**
 566  * write_unlock_fs - Release all locks on a local file system
 567  *
 568  * Experimental.
 569  *
 570  * Input:
 571  *                      buf:    '\n'-terminated C string containing the
 572  *                              absolute pathname of a local file system
 573  *                      size:   length of C string in @buf
 574  * Output:
 575  *      On success:     returns zero if all specified locks were released;
 576  *                      returns one if one or more locks were not released
 577  *      On error:       return code is negative errno value
 578  */
 579 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 580 {
 581         struct path path;
 582         char *fo_path;
 583         int error;
 584
 585         /* sanity check */
 586         if (size == 0)
 587                 return -EINVAL;
 588
 589         if (buf[size-1] != '\n')
 590                 return -EINVAL;
 591
 592         fo_path = buf;
 593         if (qword_get(&buf, fo_path, size) < 0)
 594                 return -EINVAL;
 595
 596         error = kern_path(fo_path, 0, &path);
 597         if (error)
 598                 return error;
 599
 600         /*
 601          * XXX: Needs better sanity checking.  Otherwise we could end up
 602          * releasing locks on the wrong file system.
 603          *
 604          * For example:
 605          * 1.  Does the path refer to a directory?
 606          * 2.  Is that directory a mount point, or
 607          * 3.  Is that directory the root of an exported file system?
 608          */
 609         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 610
 611         path_put(&path);
 612         return error;
 613 }
 614
 615 /**
 616  * write_filehandle - Get a variable-length NFS file handle by path
 617  *
 618  * On input, the buffer contains a '\n'-terminated C string comprised of
 619  * three alphanumeric words separated by whitespace.  The string may
 620  * contain escape sequences.
 621  *
 622  * Input:
 623  *                      buf:
 624  *                              domain:         client domain name
 625  *                              path:           export pathname
 626  *                              maxsize:        numeric maximum size of
 627  *                                              @buf
 628  *                      size:   length of C string in @buf
 629  * Output:
 630  *      On success:     passed-in buffer filled with '\n'-terminated C
 631  *                      string containing a ASCII hex text version
 632  *                      of the NFS file handle;
 633  *                      return code is the size in bytes of the string
 634  *      On error:       return code is negative errno value
 635  */
 636 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 637 {
 638         char *dname, *path;
 639         int uninitialized_var(maxsize);
 640         char *mesg = buf;
 641         int len;
 642         struct auth_domain *dom;
 643         struct knfsd_fh fh;
 644
 645         if (size == 0)
 646                 return -EINVAL;
 647
 648         if (buf[size-1] != '\n')
 649                 return -EINVAL;
 650         buf[size-1] = 0;
 651
 652         dname = mesg;
 653         len = qword_get(&mesg, dname, size);
 654         if (len <= 0)
 655                 return -EINVAL;
 656
 657         path = dname+len+1;
 658         len = qword_get(&mesg, path, size);
 659         if (len <= 0)
 660                 return -EINVAL;
 661
 662         len = get_int(&mesg, &maxsize);
 663         if (len)
 664                 return len;
 665
 666         if (maxsize < NFS_FHSIZE)
 667                 return -EINVAL;
 668         if (maxsize > NFS3_FHSIZE)
 669                 maxsize = NFS3_FHSIZE;
 670
 671         if (qword_get(&mesg, mesg, size)>0)
 672                 return -EINVAL;
 673
 674         /* we have all the words, they are in buf.. */
 675         dom = unix_domain_find(dname);
 676         if (!dom)
 677                 return -ENOMEM;
 678
 679         len = exp_rootfh(dom, path, &fh,  maxsize);
 680         auth_domain_put(dom);
 681         if (len)
 682                 return len;
 683
 684         mesg = buf;
 685         len = SIMPLE_TRANSACTION_LIMIT;
 686         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 687         mesg[-1] = '\n';
 688         return mesg - buf;
 689 }
 690
 691 /**
 692  * write_threads - Start NFSD, or report the current number of running threads
 693  *
 694  * Input:
 695  *                      buf:            ignored
 696  *                      size:           zero
 697  * Output:
 698  *      On success:     passed-in buffer filled with '\n'-terminated C
 699  *                      string numeric value representing the number of
 700  *                      running NFSD threads;
 701  *                      return code is the size in bytes of the string
 702  *      On error:       return code is zero
 703  *
 704  * OR
 705  *
 706  * Input:
 707  *                      buf:            C string containing an unsigned
 708  *                                      integer value representing the
 709  *                                      number of NFSD threads to start
 710  *                      size:           non-zero length of C string in @buf
 711  * Output:
 712  *      On success:     NFS service is started;
 713  *                      passed-in buffer filled with '\n'-terminated C
 714  *                      string numeric value representing the number of
 715  *                      running NFSD threads;
 716  *                      return code is the size in bytes of the string
 717  *      On error:       return code is zero or a negative errno value
 718  */
 719 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 720 {
 721         char *mesg = buf;
 722         int rv;
 723         if (size > 0) {
 724                 int newthreads;
 725                 rv = get_int(&mesg, &newthreads);
 726                 if (rv)
 727                         return rv;
 728                 if (newthreads < 0)
 729                         return -EINVAL;
 730                 rv = nfsd_svc(NFS_PORT, newthreads);
 731                 if (rv < 0)
 732                         return rv;
 733         } else
 734                 rv = nfsd_nrthreads();
 735
 736         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 737 }
 738
 739 /**
 740  * write_pool_threads - Set or report the current number of threads per pool
 741  *
 742  * Input:
 743  *                      buf:            ignored
 744  *                      size:           zero
 745  *
 746  * OR
 747  *
 748  * Input:
 749  *                      buf:            C string containing whitespace-
 750  *                                      separated unsigned integer values
 751  *                                      representing the number of NFSD
 752  *                                      threads to start in each pool
 753  *                      size:           non-zero length of C string in @buf
 754  * Output:
 755  *      On success:     passed-in buffer filled with '\n'-terminated C
 756  *                      string containing integer values representing the
 757  *                      number of NFSD threads in each pool;
 758  *                      return code is the size in bytes of the string
 759  *      On error:       return code is zero or a negative errno value
 760  */
 761 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 762 {
 763         /* if size > 0, look for an array of number of threads per node
 764          * and apply them  then write out number of threads per node as reply
 765          */
 766         char *mesg = buf;
 767         int i;
 768         int rv;
 769         int len;
 770         int npools;
 771         int *nthreads;
 772
 773         mutex_lock(&nfsd_mutex);
 774         npools = nfsd_nrpools();
 775         if (npools == 0) {
 776                 /*
 777                  * NFS is shut down.  The admin can start it by
 778                  * writing to the threads file but NOT the pool_threads
 779                  * file, sorry.  Report zero threads.
 780                  */
 781                 mutex_unlock(&nfsd_mutex);
 782                 strcpy(buf, "0\n");
 783                 return strlen(buf);
 784         }
 785
 786         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 787         rv = -ENOMEM;
 788         if (nthreads == NULL)
 789                 goto out_free;
 790
 791         if (size > 0) {
 792                 for (i = 0; i < npools; i++) {
 793                         rv = get_int(&mesg, &nthreads[i]);
 794                         if (rv == -ENOENT)
 795                                 break;          /* fewer numbers than pools */
 796                         if (rv)
 797                                 goto out_free;  /* syntax error */
 798                         rv = -EINVAL;
 799                         if (nthreads[i] < 0)
 800                                 goto out_free;
 801                 }
 802                 rv = nfsd_set_nrthreads(i, nthreads);
 803                 if (rv)
 804                         goto out_free;
 805         }
 806
 807         rv = nfsd_get_nrthreads(npools, nthreads);
 808         if (rv)
 809                 goto out_free;
 810
 811         mesg = buf;
 812         size = SIMPLE_TRANSACTION_LIMIT;
 813         for (i = 0; i < npools && size > 0; i++) {
 814                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 815                 len = strlen(mesg);
 816                 size -= len;
 817                 mesg += len;
 818         }
 819         rv = mesg - buf;
 820 out_free:
 821         kfree(nthreads);
 822         mutex_unlock(&nfsd_mutex);
 823         return rv;
 824 }
 825
 826 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 827 {
 828         char *mesg = buf;
 829         char *vers, *minorp, sign;
 830         int len, num, remaining;
 831         unsigned minor;
 832         ssize_t tlen = 0;
 833         char *sep;
 834
 835         if (size>0) {
 836                 if (nfsd_serv)
 837                         /* Cannot change versions without updating
 838                          * nfsd_serv->sv_xdrsize, and reallocing
 839                          * rq_argp and rq_resp
 840                          */
 841                         return -EBUSY;
 842                 if (buf[size-1] != '\n')
 843                         return -EINVAL;
 844                 buf[size-1] = 0;
 845
 846                 vers = mesg;
 847                 len = qword_get(&mesg, vers, size);
 848                 if (len <= 0) return -EINVAL;
 849                 do {
 850                         sign = *vers;
 851                         if (sign == '+' || sign == '-')
 852                                 num = simple_strtol((vers+1), &minorp, 0);
 853                         else
 854                                 num = simple_strtol(vers, &minorp, 0);
 855                         if (*minorp == '.') {
 856                                 if (num < 4)
 857                                         return -EINVAL;
 858                                 minor = simple_strtoul(minorp+1, NULL, 0);
 859                                 if (minor == 0)
 860                                         return -EINVAL;
 861                                 if (nfsd_minorversion(minor, sign == '-' ?
 862                                                      NFSD_CLEAR : NFSD_SET) < 0)
 863                                         return -EINVAL;
 864                                 goto next;
 865                         }
 866                         switch(num) {
 867                         case 2:
 868                         case 3:
 869                         case 4:
 870                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 871                                 break;
 872                         default:
 873                                 return -EINVAL;
 874                         }
 875                 next:
 876                         vers += len + 1;
 877                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 878                 /* If all get turned off, turn them back on, as
 879                  * having no versions is BAD
 880                  */
 881                 nfsd_reset_versions();
 882         }
 883
 884         /* Now write current state into reply buffer */
 885         len = 0;
 886         sep = "";
 887         remaining = SIMPLE_TRANSACTION_LIMIT;
 888         for (num=2 ; num <= 4 ; num++)
 889                 if (nfsd_vers(num, NFSD_AVAIL)) {
 890                         len = snprintf(buf, remaining, "%s%c%d", sep,
 891                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 892                                        num);
 893                         sep = " ";
 894
 895                         if (len > remaining)
 896                                 break;
 897                         remaining -= len;
 898                         buf += len;
 899                         tlen += len;
 900                 }
 901         if (nfsd_vers(4, NFSD_AVAIL))
 902                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 903                      minor++) {
 904                         len = snprintf(buf, remaining, " %c4.%u",
 905                                         (nfsd_vers(4, NFSD_TEST) &&
 906                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 907                                                 '+' : '-',
 908                                         minor);
 909
 910                         if (len > remaining)
 911                                 break;
 912                         remaining -= len;
 913                         buf += len;
 914                         tlen += len;
 915                 }
 916
 917         len = snprintf(buf, remaining, "\n");
 918         if (len > remaining)
 919                 return -EINVAL;
 920         return tlen + len;
 921 }
 922
 923 /**
 924  * write_versions - Set or report the available NFS protocol versions
 925  *
 926  * Input:
 927  *                      buf:            ignored
 928  *                      size:           zero
 929  * Output:
 930  *      On success:     passed-in buffer filled with '\n'-terminated C
 931  *                      string containing positive or negative integer
 932  *                      values representing the current status of each
 933  *                      protocol version;
 934  *                      return code is the size in bytes of the string
 935  *      On error:       return code is zero or a negative errno value
 936  *
 937  * OR
 938  *
 939  * Input:
 940  *                      buf:            C string containing whitespace-
 941  *                                      separated positive or negative
 942  *                                      integer values representing NFS
 943  *                                      protocol versions to enable ("+n")
 944  *                                      or disable ("-n")
 945  *                      size:           non-zero length of C string in @buf
 946  * Output:
 947  *      On success:     status of zero or more protocol versions has
 948  *                      been updated; passed-in buffer filled with
 949  *                      '\n'-terminated C string containing positive
 950  *                      or negative integer values representing the
 951  *                      current status of each protocol version;
 952  *                      return code is the size in bytes of the string
 953  *      On error:       return code is zero or a negative errno value
 954  */
 955 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 956 {
 957         ssize_t rv;
 958
 959         mutex_lock(&nfsd_mutex);
 960         rv = __write_versions(file, buf, size);
 961         mutex_unlock(&nfsd_mutex);
 962         return rv;
 963 }
 964
 965 /*
 966  * Zero-length write.  Return a list of NFSD's current listener
 967  * transports.
 968  */
 969 static ssize_t __write_ports_names(char *buf)
 970 {
 971         if (nfsd_serv == NULL)
 972                 return 0;
 973         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 974 }
 975
 976 /*
 977  * A single 'fd' number was written, in which case it must be for
 978  * a socket of a supported family/protocol, and we use it as an
 979  * nfsd listener.
 980  */
 981 static ssize_t __write_ports_addfd(char *buf)
 982 {
 983         char *mesg = buf;
 984         int fd, err;
 985
 986         err = get_int(&mesg, &fd);
 987         if (err != 0 || fd < 0)
 988                 return -EINVAL;
 989
 990         err = nfsd_create_serv();
 991         if (err != 0)
 992                 return err;
 993
 994         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 995         if (err < 0) {
 996                 svc_destroy(nfsd_serv);
 997                 return err;
 998         }
 999
1000         /* Decrease the count, but don't shut down the service */
1001         nfsd_serv->sv_nrthreads--;
1002         return err;
1003 }
1004
1005 /*
1006  * A '-' followed by the 'name' of a socket means we close the socket.
1007  */
1008 static ssize_t __write_ports_delfd(char *buf)
1009 {
1010         char *toclose;
1011         int len = 0;
1012
1013         toclose = kstrdup(buf + 1, GFP_KERNEL);
1014         if (toclose == NULL)
1015                 return -ENOMEM;
1016
1017         if (nfsd_serv != NULL)
1018                 len = svc_sock_names(nfsd_serv, buf,
1019                                         SIMPLE_TRANSACTION_LIMIT, toclose);
1020         kfree(toclose);
1021         return len;
1022 }
1023
1024 /*
1025  * A transport listener is added by writing it's transport name and
1026  * a port number.
1027  */
1028 static ssize_t __write_ports_addxprt(char *buf)
1029 {
1030         char transport[16];
1031         struct svc_xprt *xprt;
1032         int port, err;
1033
1034         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1035                 return -EINVAL;
1036
1037         if (port < 1 || port > USHRT_MAX)
1038                 return -EINVAL;
1039
1040         err = nfsd_create_serv();
1041         if (err != 0)
1042                 return err;
1043
1044         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1045                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1046         if (err < 0)
1047                 goto out_err;
1048
1049         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1050                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1051         if (err < 0 && err != -EAFNOSUPPORT)
1052                 goto out_close;
1053
1054         /* Decrease the count, but don't shut down the service */
1055         nfsd_serv->sv_nrthreads--;
1056         return 0;
1057 out_close:
1058         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1059         if (xprt != NULL) {
1060                 svc_close_xprt(xprt);
1061                 svc_xprt_put(xprt);
1062         }
1063 out_err:
1064         svc_destroy(nfsd_serv);
1065         return err;
1066 }
1067
1068 /*
1069  * A transport listener is removed by writing a "-", it's transport
1070  * name, and it's port number.
1071  */
1072 static ssize_t __write_ports_delxprt(char *buf)
1073 {
1074         struct svc_xprt *xprt;
1075         char transport[16];
1076         int port;
1077
1078         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1079                 return -EINVAL;
1080
1081         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1082                 return -EINVAL;
1083
1084         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1085         if (xprt == NULL)
1086                 return -ENOTCONN;
1087
1088         svc_close_xprt(xprt);
1089         svc_xprt_put(xprt);
1090         return 0;
1091 }
1092
1093 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1094 {
1095         if (size == 0)
1096                 return __write_ports_names(buf);
1097
1098         if (isdigit(buf[0]))
1099                 return __write_ports_addfd(buf);
1100
1101         if (buf[0] == '-' && isdigit(buf[1]))
1102                 return __write_ports_delfd(buf);
1103
1104         if (isalpha(buf[0]))
1105                 return __write_ports_addxprt(buf);
1106
1107         if (buf[0] == '-' && isalpha(buf[1]))
1108                 return __write_ports_delxprt(buf);
1109
1110         return -EINVAL;
1111 }
1112
1113 /**
1114  * write_ports - Pass a socket file descriptor or transport name to listen on
1115  *
1116  * Input:
1117  *                      buf:            ignored
1118  *                      size:           zero
1119  * Output:
1120  *      On success:     passed-in buffer filled with a '\n'-terminated C
1121  *                      string containing a whitespace-separated list of
1122  *                      named NFSD listeners;
1123  *                      return code is the size in bytes of the string
1124  *      On error:       return code is zero or a negative errno value
1125  *
1126  * OR
1127  *
1128  * Input:
1129  *                      buf:            C string containing an unsigned
1130  *                                      integer value representing a bound
1131  *                                      but unconnected socket that is to be
1132  *                                      used as an NFSD listener; listen(3)
1133  *                                      must be called for a SOCK_STREAM
1134  *                                      socket, otherwise it is ignored
1135  *                      size:           non-zero length of C string in @buf
1136  * Output:
1137  *      On success:     NFS service is started;
1138  *                      passed-in buffer filled with a '\n'-terminated C
1139  *                      string containing a unique alphanumeric name of
1140  *                      the listener;
1141  *                      return code is the size in bytes of the string
1142  *      On error:       return code is a negative errno value
1143  *
1144  * OR
1145  *
1146  * Input:
1147  *                      buf:            C string containing a "-" followed
1148  *                                      by an integer value representing a
1149  *                                      previously passed in socket file
1150  *                                      descriptor
1151  *                      size:           non-zero length of C string in @buf
1152  * Output:
1153  *      On success:     NFS service no longer listens on that socket;
1154  *                      passed-in buffer filled with a '\n'-terminated C
1155  *                      string containing a unique name of the listener;
1156  *                      return code is the size in bytes of the string
1157  *      On error:       return code is a negative errno value
1158  *
1159  * OR
1160  *
1161  * Input:
1162  *                      buf:            C string containing a transport
1163  *                                      name and an unsigned integer value
1164  *                                      representing the port to listen on,
1165  *                                      separated by whitespace
1166  *                      size:           non-zero length of C string in @buf
1167  * Output:
1168  *      On success:     returns zero; NFS service is started
1169  *      On error:       return code is a negative errno value
1170  *
1171  * OR
1172  *
1173  * Input:
1174  *                      buf:            C string containing a "-" followed
1175  *                                      by a transport name and an unsigned
1176  *                                      integer value representing the port
1177  *                                      to listen on, separated by whitespace
1178  *                      size:           non-zero length of C string in @buf
1179  * Output:
1180  *      On success:     returns zero; NFS service no longer listens
1181  *                      on that transport
1182  *      On error:       return code is a negative errno value
1183  */
1184 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1185 {
1186         ssize_t rv;
1187
1188         mutex_lock(&nfsd_mutex);
1189         rv = __write_ports(file, buf, size);
1190         mutex_unlock(&nfsd_mutex);
1191         return rv;
1192 }
1193
1194
1195 int nfsd_max_blksize;
1196
1197 /**
1198  * write_maxblksize - Set or report the current NFS blksize
1199  *
1200  * Input:
1201  *                      buf:            ignored
1202  *                      size:           zero
1203  *
1204  * OR
1205  *
1206  * Input:
1207  *                      buf:            C string containing an unsigned
1208  *                                      integer value representing the new
1209  *                                      NFS blksize
1210  *                      size:           non-zero length of C string in @buf
1211  * Output:
1212  *      On success:     passed-in buffer filled with '\n'-terminated C string
1213  *                      containing numeric value of the current NFS blksize
1214  *                      setting;
1215  *                      return code is the size in bytes of the string
1216  *      On error:       return code is zero or a negative errno value
1217  */
1218 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1219 {
1220         char *mesg = buf;
1221         if (size > 0) {
1222                 int bsize;
1223                 int rv = get_int(&mesg, &bsize);
1224                 if (rv)
1225                         return rv;
1226                 /* force bsize into allowed range and
1227                  * required alignment.
1228                  */
1229                 if (bsize < 1024)
1230                         bsize = 1024;
1231                 if (bsize > NFSSVC_MAXBLKSIZE)
1232                         bsize = NFSSVC_MAXBLKSIZE;
1233                 bsize &= ~(1024-1);
1234                 mutex_lock(&nfsd_mutex);
1235                 if (nfsd_serv) {
1236                         mutex_unlock(&nfsd_mutex);
1237                         return -EBUSY;
1238                 }
1239                 nfsd_max_blksize = bsize;
1240                 mutex_unlock(&nfsd_mutex);
1241         }
1242
1243         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1244                                                         nfsd_max_blksize);
1245 }
1246
1247 #ifdef CONFIG_NFSD_V4
1248 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1249 {
1250         char *mesg = buf;
1251         int rv, i;
1252
1253         if (size > 0) {
1254                 if (nfsd_serv)
1255                         return -EBUSY;
1256                 rv = get_int(&mesg, &i);
1257                 if (rv)
1258                         return rv;
1259                 /*
1260                  * Some sanity checking.  We don't have a reason for
1261                  * these particular numbers, but problems with the
1262                  * extremes are:
1263                  *      - Too short: the briefest network outage may
1264                  *        cause clients to lose all their locks.  Also,
1265                  *        the frequent polling may be wasteful.
1266                  *      - Too long: do you really want reboot recovery
1267                  *        to take more than an hour?  Or to make other
1268                  *        clients wait an hour before being able to
1269                  *        revoke a dead client's locks?
1270                  */
1271                 if (i < 10 || i > 3600)
1272                         return -EINVAL;
1273                 *time = i;
1274         }
1275
1276         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1277 }
1278
1279 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1280 {
1281         ssize_t rv;
1282
1283         mutex_lock(&nfsd_mutex);
1284         rv = __nfsd4_write_time(file, buf, size, time);
1285         mutex_unlock(&nfsd_mutex);
1286         return rv;
1287 }
1288
1289 /**
1290  * write_leasetime - Set or report the current NFSv4 lease time
1291  *
1292  * Input:
1293  *                      buf:            ignored
1294  *                      size:           zero
1295  *
1296  * OR
1297  *
1298  * Input:
1299  *                      buf:            C string containing an unsigned
1300  *                                      integer value representing the new
1301  *                                      NFSv4 lease expiry time
1302  *                      size:           non-zero length of C string in @buf
1303  * Output:
1304  *      On success:     passed-in buffer filled with '\n'-terminated C
1305  *                      string containing unsigned integer value of the
1306  *                      current lease expiry time;
1307  *                      return code is the size in bytes of the string
1308  *      On error:       return code is zero or a negative errno value
1309  */
1310 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1311 {
1312         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1313 }
1314
1315 /**
1316  * write_gracetime - Set or report current NFSv4 grace period time
1317  *
1318  * As above, but sets the time of the NFSv4 grace period.
1319  *
1320  * Note this should never be set to less than the *previous*
1321  * lease-period time, but we don't try to enforce this.  (In the common
1322  * case (a new boot), we don't know what the previous lease time was
1323  * anyway.)
1324  */
1325 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1326 {
1327         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1328 }
1329
1330 extern char *nfs4_recoverydir(void);
1331
1332 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1333 {
1334         char *mesg = buf;
1335         char *recdir;
1336         int len, status;
1337
1338         if (size > 0) {
1339                 if (nfsd_serv)
1340                         return -EBUSY;
1341                 if (size > PATH_MAX || buf[size-1] != '\n')
1342                         return -EINVAL;
1343                 buf[size-1] = 0;
1344
1345                 recdir = mesg;
1346                 len = qword_get(&mesg, recdir, size);
1347                 if (len <= 0)
1348                         return -EINVAL;
1349
1350                 status = nfs4_reset_recoverydir(recdir);
1351                 if (status)
1352                         return status;
1353         }
1354
1355         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1356                                                         nfs4_recoverydir());
1357 }
1358
1359 /**
1360  * write_recoverydir - Set or report the pathname of the recovery directory
1361  *
1362  * Input:
1363  *                      buf:            ignored
1364  *                      size:           zero
1365  *
1366  * OR
1367  *
1368  * Input:
1369  *                      buf:            C string containing the pathname
1370  *                                      of the directory on a local file
1371  *                                      system containing permanent NFSv4
1372  *                                      recovery data
1373  *                      size:           non-zero length of C string in @buf
1374  * Output:
1375  *      On success:     passed-in buffer filled with '\n'-terminated C string
1376  *                      containing the current recovery pathname setting;
1377  *                      return code is the size in bytes of the string
1378  *      On error:       return code is zero or a negative errno value
1379  */
1380 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1381 {
1382         ssize_t rv;
1383
1384         mutex_lock(&nfsd_mutex);
1385         rv = __write_recoverydir(file, buf, size);
1386         mutex_unlock(&nfsd_mutex);
1387         return rv;
1388 }
1389
1390 #endif
1391
1392 /*----------------------------------------------------------------------------*/
1393 /*
1394  *      populating the filesystem.
1395  */
1396
1397 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1398 {
1399         static struct tree_descr nfsd_files[] = {
1400 #ifdef CONFIG_NFSD_DEPRECATED
1401                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1402                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1403                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1404                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1405                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1406                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1407                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1408 #endif
1409                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1410                 [NFSD_Export_features] = {"export_features",
1411                                         &export_features_operations, S_IRUGO},
1412                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1413                                         &transaction_ops, S_IWUSR|S_IRUSR},
1414                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1415                                         &transaction_ops, S_IWUSR|S_IRUSR},
1416                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1417                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1418                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1419                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1420                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1421                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1422                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1423 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1424                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1425 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1426 #ifdef CONFIG_NFSD_V4
1427                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1428                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1429                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1430 #endif
1431                 /* last one */ {""}
1432         };
1433         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1434 }
1435
1436 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1437         int flags, const char *dev_name, void *data)
1438 {
1439         return mount_single(fs_type, flags, data, nfsd_fill_super);
1440 }
1441
1442 static struct file_system_type nfsd_fs_type = {
1443         .owner          = THIS_MODULE,
1444         .name           = "nfsd",
1445         .mount          = nfsd_mount,
1446         .kill_sb        = kill_litter_super,
1447 };
1448
1449 #ifdef CONFIG_PROC_FS
1450 static int create_proc_exports_entry(void)
1451 {
1452         struct proc_dir_entry *entry;
1453
1454         entry = proc_mkdir("fs/nfs", NULL);
1455         if (!entry)
1456                 return -ENOMEM;
1457         entry = proc_create("exports", 0, entry, &exports_operations);
1458         if (!entry)
1459                 return -ENOMEM;
1460         return 0;
1461 }
1462 #else /* CONFIG_PROC_FS */
1463 static int create_proc_exports_entry(void)
1464 {
1465         return 0;
1466 }
1467 #endif
1468
1469 static int __init init_nfsd(void)
1470 {
1471         int retval;
1472         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1473
1474         retval = nfs4_state_init(); /* nfs4 locking state */
1475         if (retval)
1476                 return retval;
1477         nfsd_stat_init();       /* Statistics */
1478         retval = nfsd_reply_cache_init();
1479         if (retval)
1480                 goto out_free_stat;
1481         retval = nfsd_export_init();
1482         if (retval)
1483                 goto out_free_cache;
1484         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1485         retval = nfsd_idmap_init();
1486         if (retval)
1487                 goto out_free_lockd;
1488         retval = create_proc_exports_entry();
1489         if (retval)
1490                 goto out_free_idmap;
1491         retval = register_filesystem(&nfsd_fs_type);
1492         if (retval)
1493                 goto out_free_all;
1494         return 0;
1495 out_free_all:
1496         remove_proc_entry("fs/nfs/exports", NULL);
1497         remove_proc_entry("fs/nfs", NULL);
1498 out_free_idmap:
1499         nfsd_idmap_shutdown();
1500 out_free_lockd:
1501         nfsd_lockd_shutdown();
1502         nfsd_export_shutdown();
1503 out_free_cache:
1504         nfsd_reply_cache_shutdown();
1505 out_free_stat:
1506         nfsd_stat_shutdown();
1507         nfsd4_free_slabs();
1508         return retval;
1509 }
1510
1511 static void __exit exit_nfsd(void)
1512 {
1513         nfsd_export_shutdown();
1514         nfsd_reply_cache_shutdown();
1515         remove_proc_entry("fs/nfs/exports", NULL);
1516         remove_proc_entry("fs/nfs", NULL);
1517         nfsd_stat_shutdown();
1518         nfsd_lockd_shutdown();
1519         nfsd_idmap_shutdown();
1520         nfsd4_free_slabs();
1521         unregister_filesystem(&nfsd_fs_type);
1522 }
1523
1524 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1525 MODULE_LICENSE("GPL");
1526 module_init(init_nfsd)
1527 module_exit(exit_nfsd)