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
  17 #include "idmap.h"
  18 #include "nfsd.h"
  19 #include "cache.h"
  20
  21 /*
  22  *      We have a single directory with several nodes in it.
  23  */
  24 enum {
  25         NFSD_Root = 1,
  26 #ifdef CONFIG_NFSD_DEPRECATED
  27         NFSD_Svc,
  28         NFSD_Add,
  29         NFSD_Del,
  30         NFSD_Export,
  31         NFSD_Unexport,
  32         NFSD_Getfd,
  33         NFSD_Getfs,
  34 #endif
  35         NFSD_List,
  36         NFSD_Export_features,
  37         NFSD_Fh,
  38         NFSD_FO_UnlockIP,
  39         NFSD_FO_UnlockFS,
  40         NFSD_Threads,
  41         NFSD_Pool_Threads,
  42         NFSD_Pool_Stats,
  43         NFSD_Versions,
  44         NFSD_Ports,
  45         NFSD_MaxBlkSize,
  46         NFSD_SupportedEnctypes,
  47         /*
  48          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  49          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  50          */
  51 #ifdef CONFIG_NFSD_V4
  52         NFSD_Leasetime,
  53         NFSD_Gracetime,
  54         NFSD_RecoveryDir,
  55 #endif
  56 };
  57
  58 /*
  59  * write() for these nodes.
  60  */
  61 #ifdef CONFIG_NFSD_DEPRECATED
  62 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  63 static ssize_t write_add(struct file *file, char *buf, size_t size);
  64 static ssize_t write_del(struct file *file, char *buf, size_t size);
  65 static ssize_t write_export(struct file *file, char *buf, size_t size);
  66 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  67 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  68 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  69 #endif
  70 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  71 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  72 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  73 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  74 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  75 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  76 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  77 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  78 #ifdef CONFIG_NFSD_V4
  79 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  80 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  81 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  82 #endif
  83
  84 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  85 #ifdef CONFIG_NFSD_DEPRECATED
  86         [NFSD_Svc] = write_svc,
  87         [NFSD_Add] = write_add,
  88         [NFSD_Del] = write_del,
  89         [NFSD_Export] = write_export,
  90         [NFSD_Unexport] = write_unexport,
  91         [NFSD_Getfd] = write_getfd,
  92         [NFSD_Getfs] = write_getfs,
  93 #endif
  94         [NFSD_Fh] = write_filehandle,
  95         [NFSD_FO_UnlockIP] = write_unlock_ip,
  96         [NFSD_FO_UnlockFS] = write_unlock_fs,
  97         [NFSD_Threads] = write_threads,
  98         [NFSD_Pool_Threads] = write_pool_threads,
  99         [NFSD_Versions] = write_versions,
 100         [NFSD_Ports] = write_ports,
 101         [NFSD_MaxBlkSize] = write_maxblksize,
 102 #ifdef CONFIG_NFSD_V4
 103         [NFSD_Leasetime] = write_leasetime,
 104         [NFSD_Gracetime] = write_gracetime,
 105         [NFSD_RecoveryDir] = write_recoverydir,
 106 #endif
 107 };
 108
 109 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 110 {
 111         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 112         char *data;
 113         ssize_t rv;
 114
 115         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 116                 return -EINVAL;
 117
 118         data = simple_transaction_get(file, buf, size);
 119         if (IS_ERR(data))
 120                 return PTR_ERR(data);
 121
 122         rv =  write_op[ino](file, data, size);
 123         if (rv >= 0) {
 124                 simple_transaction_set(file, rv);
 125                 rv = size;
 126         }
 127         return rv;
 128 }
 129
 130 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 131 {
 132 #ifdef CONFIG_NFSD_DEPRECATED
 133         static int warned;
 134         if (file->f_dentry->d_name.name[0] == '.' && !warned) {
 135                 printk(KERN_INFO
 136                        "Warning: \"%s\" uses deprecated NFSD interface: %s."
 137                        "  This will be removed in 2.6.40\n",
 138                        current->comm, file->f_dentry->d_name.name);
 139                 warned = 1;
 140         }
 141 #endif
 142         if (! file->private_data) {
 143                 /* An attempt to read a transaction file without writing
 144                  * causes a 0-byte write so that the file can return
 145                  * state information
 146                  */
 147                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 148                 if (rv < 0)
 149                         return rv;
 150         }
 151         return simple_transaction_read(file, buf, size, pos);
 152 }
 153
 154 static const struct file_operations transaction_ops = {
 155         .write          = nfsctl_transaction_write,
 156         .read           = nfsctl_transaction_read,
 157         .release        = simple_transaction_release,
 158         .llseek         = default_llseek,
 159 };
 160
 161 static int exports_open(struct inode *inode, struct file *file)
 162 {
 163         return seq_open(file, &nfs_exports_op);
 164 }
 165
 166 static const struct file_operations exports_operations = {
 167         .open           = exports_open,
 168         .read           = seq_read,
 169         .llseek         = seq_lseek,
 170         .release        = seq_release,
 171         .owner          = THIS_MODULE,
 172 };
 173
 174 static int export_features_show(struct seq_file *m, void *v)
 175 {
 176         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 177         return 0;
 178 }
 179
 180 static int export_features_open(struct inode *inode, struct file *file)
 181 {
 182         return single_open(file, export_features_show, NULL);
 183 }
 184
 185 static struct file_operations export_features_operations = {
 186         .open           = export_features_open,
 187         .read           = seq_read,
 188         .llseek         = seq_lseek,
 189         .release        = single_release,
 190 };
 191
 192 #ifdef CONFIG_SUNRPC_GSS
 193 static int supported_enctypes_show(struct seq_file *m, void *v)
 194 {
 195         struct gss_api_mech *k5mech;
 196
 197         k5mech = gss_mech_get_by_name("krb5");
 198         if (k5mech == NULL)
 199                 goto out;
 200         if (k5mech->gm_upcall_enctypes != NULL)
 201                 seq_printf(m, k5mech->gm_upcall_enctypes);
 202         gss_mech_put(k5mech);
 203 out:
 204         return 0;
 205 }
 206
 207 static int supported_enctypes_open(struct inode *inode, struct file *file)
 208 {
 209         return single_open(file, supported_enctypes_show, NULL);
 210 }
 211
 212 static struct file_operations supported_enctypes_ops = {
 213         .open           = supported_enctypes_open,
 214         .read           = seq_read,
 215         .llseek         = seq_lseek,
 216         .release        = single_release,
 217 };
 218 #endif /* CONFIG_SUNRPC_GSS */
 219
 220 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 221 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 222
 223 static const struct file_operations pool_stats_operations = {
 224         .open           = nfsd_pool_stats_open,
 225         .read           = seq_read,
 226         .llseek         = seq_lseek,
 227         .release        = nfsd_pool_stats_release,
 228         .owner          = THIS_MODULE,
 229 };
 230
 231 /*----------------------------------------------------------------------------*/
 232 /*
 233  * payload - write methods
 234  */
 235
 236 #ifdef CONFIG_NFSD_DEPRECATED
 237 /**
 238  * write_svc - Start kernel's NFSD server
 239  *
 240  * Deprecated.  /proc/fs/nfsd/threads is preferred.
 241  * Function remains to support old versions of nfs-utils.
 242  *
 243  * Input:
 244  *                      buf:    struct nfsctl_svc
 245  *                              svc_port:       port number of this
 246  *                                              server's listener
 247  *                              svc_nthreads:   number of threads to start
 248  *                      size:   size in bytes of passed in nfsctl_svc
 249  * Output:
 250  *      On success:     returns zero
 251  *      On error:       return code is negative errno value
 252  */
 253 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 254 {
 255         struct nfsctl_svc *data;
 256         int err;
 257         if (size < sizeof(*data))
 258                 return -EINVAL;
 259         data = (struct nfsctl_svc*) buf;
 260         err = nfsd_svc(data->svc_port, data->svc_nthreads);
 261         if (err < 0)
 262                 return err;
 263         return 0;
 264 }
 265
 266 /**
 267  * write_add - Add or modify client entry in auth unix cache
 268  *
 269  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 270  * Function remains to support old versions of nfs-utils.
 271  *
 272  * Input:
 273  *                      buf:    struct nfsctl_client
 274  *                              cl_ident:       '\0'-terminated C string
 275  *                                              containing domain name
 276  *                                              of client
 277  *                              cl_naddr:       no. of items in cl_addrlist
 278  *                              cl_addrlist:    array of client addresses
 279  *                              cl_fhkeytype:   ignored
 280  *                              cl_fhkeylen:    ignored
 281  *                              cl_fhkey:       ignored
 282  *                      size:   size in bytes of passed in nfsctl_client
 283  * Output:
 284  *      On success:     returns zero
 285  *      On error:       return code is negative errno value
 286  *
 287  * Note: Only AF_INET client addresses are passed in, since
 288  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 289  */
 290 static ssize_t write_add(struct file *file, char *buf, size_t size)
 291 {
 292         struct nfsctl_client *data;
 293         if (size < sizeof(*data))
 294                 return -EINVAL;
 295         data = (struct nfsctl_client *)buf;
 296         return exp_addclient(data);
 297 }
 298
 299 /**
 300  * write_del - Remove client from auth unix cache
 301  *
 302  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
 303  * Function remains to support old versions of nfs-utils.
 304  *
 305  * Input:
 306  *                      buf:    struct nfsctl_client
 307  *                              cl_ident:       '\0'-terminated C string
 308  *                                              containing domain name
 309  *                                              of client
 310  *                              cl_naddr:       ignored
 311  *                              cl_addrlist:    ignored
 312  *                              cl_fhkeytype:   ignored
 313  *                              cl_fhkeylen:    ignored
 314  *                              cl_fhkey:       ignored
 315  *                      size:   size in bytes of passed in nfsctl_client
 316  * Output:
 317  *      On success:     returns zero
 318  *      On error:       return code is negative errno value
 319  *
 320  * Note: Only AF_INET client addresses are passed in, since
 321  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
 322  */
 323 static ssize_t write_del(struct file *file, char *buf, size_t size)
 324 {
 325         struct nfsctl_client *data;
 326         if (size < sizeof(*data))
 327                 return -EINVAL;
 328         data = (struct nfsctl_client *)buf;
 329         return exp_delclient(data);
 330 }
 331
 332 /**
 333  * write_export - Export part or all of a local file system
 334  *
 335  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 336  * Function remains to support old versions of nfs-utils.
 337  *
 338  * Input:
 339  *                      buf:    struct nfsctl_export
 340  *                              ex_client:      '\0'-terminated C string
 341  *                                              containing domain name
 342  *                                              of client allowed to access
 343  *                                              this export
 344  *                              ex_path:        '\0'-terminated C string
 345  *                                              containing pathname of
 346  *                                              directory in local file system
 347  *                              ex_dev:         fsid to use for this export
 348  *                              ex_ino:         ignored
 349  *                              ex_flags:       export flags for this export
 350  *                              ex_anon_uid:    UID to use for anonymous
 351  *                                              requests
 352  *                              ex_anon_gid:    GID to use for anonymous
 353  *                                              requests
 354  *                      size:   size in bytes of passed in nfsctl_export
 355  * Output:
 356  *      On success:     returns zero
 357  *      On error:       return code is negative errno value
 358  */
 359 static ssize_t write_export(struct file *file, char *buf, size_t size)
 360 {
 361         struct nfsctl_export *data;
 362         if (size < sizeof(*data))
 363                 return -EINVAL;
 364         data = (struct nfsctl_export*)buf;
 365         return exp_export(data);
 366 }
 367
 368 /**
 369  * write_unexport - Unexport a previously exported file system
 370  *
 371  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
 372  * Function remains to support old versions of nfs-utils.
 373  *
 374  * Input:
 375  *                      buf:    struct nfsctl_export
 376  *                              ex_client:      '\0'-terminated C string
 377  *                                              containing domain name
 378  *                                              of client no longer allowed
 379  *                                              to access this export
 380  *                              ex_path:        '\0'-terminated C string
 381  *                                              containing pathname of
 382  *                                              directory in local file system
 383  *                              ex_dev:         ignored
 384  *                              ex_ino:         ignored
 385  *                              ex_flags:       ignored
 386  *                              ex_anon_uid:    ignored
 387  *                              ex_anon_gid:    ignored
 388  *                      size:   size in bytes of passed in nfsctl_export
 389  * Output:
 390  *      On success:     returns zero
 391  *      On error:       return code is negative errno value
 392  */
 393 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 394 {
 395         struct nfsctl_export *data;
 396
 397         if (size < sizeof(*data))
 398                 return -EINVAL;
 399         data = (struct nfsctl_export*)buf;
 400         return exp_unexport(data);
 401 }
 402
 403 /**
 404  * write_getfs - Get a variable-length NFS file handle by path
 405  *
 406  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 407  * Function remains to support old versions of nfs-utils.
 408  *
 409  * Input:
 410  *                      buf:    struct nfsctl_fsparm
 411  *                              gd_addr:        socket address of client
 412  *                              gd_path:        '\0'-terminated C string
 413  *                                              containing pathname of
 414  *                                              directory in local file system
 415  *                              gd_maxlen:      maximum size of returned file
 416  *                                              handle
 417  *                      size:   size in bytes of passed in nfsctl_fsparm
 418  * Output:
 419  *      On success:     passed-in buffer filled with a knfsd_fh structure
 420  *                      (a variable-length raw NFS file handle);
 421  *                      return code is the size in bytes of the file handle
 422  *      On error:       return code is negative errno value
 423  *
 424  * Note: Only AF_INET client addresses are passed in, since gd_addr
 425  * is the same size as a struct sockaddr_in.
 426  */
 427 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 428 {
 429         struct nfsctl_fsparm *data;
 430         struct sockaddr_in *sin;
 431         struct auth_domain *clp;
 432         int err = 0;
 433         struct knfsd_fh *res;
 434         struct in6_addr in6;
 435
 436         if (size < sizeof(*data))
 437                 return -EINVAL;
 438         data = (struct nfsctl_fsparm*)buf;
 439         err = -EPROTONOSUPPORT;
 440         if (data->gd_addr.sa_family != AF_INET)
 441                 goto out;
 442         sin = (struct sockaddr_in *)&data->gd_addr;
 443         if (data->gd_maxlen > NFS3_FHSIZE)
 444                 data->gd_maxlen = NFS3_FHSIZE;
 445
 446         res = (struct knfsd_fh*)buf;
 447
 448         exp_readlock();
 449
 450         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 451
 452         clp = auth_unix_lookup(&init_net, &in6);
 453         if (!clp)
 454                 err = -EPERM;
 455         else {
 456                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 457                 auth_domain_put(clp);
 458         }
 459         exp_readunlock();
 460         if (err == 0)
 461                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 462  out:
 463         return err;
 464 }
 465
 466 /**
 467  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
 468  *
 469  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
 470  * Function remains to support old versions of nfs-utils.
 471  *
 472  * Input:
 473  *                      buf:    struct nfsctl_fdparm
 474  *                              gd_addr:        socket address of client
 475  *                              gd_path:        '\0'-terminated C string
 476  *                                              containing pathname of
 477  *                                              directory in local file system
 478  *                              gd_version:     fdparm structure version
 479  *                      size:   size in bytes of passed in nfsctl_fdparm
 480  * Output:
 481  *      On success:     passed-in buffer filled with nfsctl_res
 482  *                      (a fixed-length raw NFS file handle);
 483  *                      return code is the size in bytes of the file handle
 484  *      On error:       return code is negative errno value
 485  *
 486  * Note: Only AF_INET client addresses are passed in, since gd_addr
 487  * is the same size as a struct sockaddr_in.
 488  */
 489 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 490 {
 491         struct nfsctl_fdparm *data;
 492         struct sockaddr_in *sin;
 493         struct auth_domain *clp;
 494         int err = 0;
 495         struct knfsd_fh fh;
 496         char *res;
 497         struct in6_addr in6;
 498
 499         if (size < sizeof(*data))
 500                 return -EINVAL;
 501         data = (struct nfsctl_fdparm*)buf;
 502         err = -EPROTONOSUPPORT;
 503         if (data->gd_addr.sa_family != AF_INET)
 504                 goto out;
 505         err = -EINVAL;
 506         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 507                 goto out;
 508
 509         res = buf;
 510         sin = (struct sockaddr_in *)&data->gd_addr;
 511         exp_readlock();
 512
 513         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 514
 515         clp = auth_unix_lookup(&init_net, &in6);
 516         if (!clp)
 517                 err = -EPERM;
 518         else {
 519                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 520                 auth_domain_put(clp);
 521         }
 522         exp_readunlock();
 523
 524         if (err == 0) {
 525                 memset(res,0, NFS_FHSIZE);
 526                 memcpy(res, &fh.fh_base, fh.fh_size);
 527                 err = NFS_FHSIZE;
 528         }
 529  out:
 530         return err;
 531 }
 532 #endif /* CONFIG_NFSD_DEPRECATED */
 533
 534 /**
 535  * write_unlock_ip - Release all locks used by a client
 536  *
 537  * Experimental.
 538  *
 539  * Input:
 540  *                      buf:    '\n'-terminated C string containing a
 541  *                              presentation format IP address
 542  *                      size:   length of C string in @buf
 543  * Output:
 544  *      On success:     returns zero if all specified locks were released;
 545  *                      returns one if one or more locks were not released
 546  *      On error:       return code is negative errno value
 547  */
 548 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 549 {
 550         struct sockaddr_storage address;
 551         struct sockaddr *sap = (struct sockaddr *)&address;
 552         size_t salen = sizeof(address);
 553         char *fo_path;
 554
 555         /* sanity check */
 556         if (size == 0)
 557                 return -EINVAL;
 558
 559         if (buf[size-1] != '\n')
 560                 return -EINVAL;
 561
 562         fo_path = buf;
 563         if (qword_get(&buf, fo_path, size) < 0)
 564                 return -EINVAL;
 565
 566         if (rpc_pton(fo_path, size, sap, salen) == 0)
 567                 return -EINVAL;
 568
 569         return nlmsvc_unlock_all_by_ip(sap);
 570 }
 571
 572 /**
 573  * write_unlock_fs - Release all locks on a local file system
 574  *
 575  * Experimental.
 576  *
 577  * Input:
 578  *                      buf:    '\n'-terminated C string containing the
 579  *                              absolute pathname of a local file system
 580  *                      size:   length of C string in @buf
 581  * Output:
 582  *      On success:     returns zero if all specified locks were released;
 583  *                      returns one if one or more locks were not released
 584  *      On error:       return code is negative errno value
 585  */
 586 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 587 {
 588         struct path path;
 589         char *fo_path;
 590         int error;
 591
 592         /* sanity check */
 593         if (size == 0)
 594                 return -EINVAL;
 595
 596         if (buf[size-1] != '\n')
 597                 return -EINVAL;
 598
 599         fo_path = buf;
 600         if (qword_get(&buf, fo_path, size) < 0)
 601                 return -EINVAL;
 602
 603         error = kern_path(fo_path, 0, &path);
 604         if (error)
 605                 return error;
 606
 607         /*
 608          * XXX: Needs better sanity checking.  Otherwise we could end up
 609          * releasing locks on the wrong file system.
 610          *
 611          * For example:
 612          * 1.  Does the path refer to a directory?
 613          * 2.  Is that directory a mount point, or
 614          * 3.  Is that directory the root of an exported file system?
 615          */
 616         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 617
 618         path_put(&path);
 619         return error;
 620 }
 621
 622 /**
 623  * write_filehandle - Get a variable-length NFS file handle by path
 624  *
 625  * On input, the buffer contains a '\n'-terminated C string comprised of
 626  * three alphanumeric words separated by whitespace.  The string may
 627  * contain escape sequences.
 628  *
 629  * Input:
 630  *                      buf:
 631  *                              domain:         client domain name
 632  *                              path:           export pathname
 633  *                              maxsize:        numeric maximum size of
 634  *                                              @buf
 635  *                      size:   length of C string in @buf
 636  * Output:
 637  *      On success:     passed-in buffer filled with '\n'-terminated C
 638  *                      string containing a ASCII hex text version
 639  *                      of the NFS file handle;
 640  *                      return code is the size in bytes of the string
 641  *      On error:       return code is negative errno value
 642  */
 643 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 644 {
 645         char *dname, *path;
 646         int uninitialized_var(maxsize);
 647         char *mesg = buf;
 648         int len;
 649         struct auth_domain *dom;
 650         struct knfsd_fh fh;
 651
 652         if (size == 0)
 653                 return -EINVAL;
 654
 655         if (buf[size-1] != '\n')
 656                 return -EINVAL;
 657         buf[size-1] = 0;
 658
 659         dname = mesg;
 660         len = qword_get(&mesg, dname, size);
 661         if (len <= 0)
 662                 return -EINVAL;
 663
 664         path = dname+len+1;
 665         len = qword_get(&mesg, path, size);
 666         if (len <= 0)
 667                 return -EINVAL;
 668
 669         len = get_int(&mesg, &maxsize);
 670         if (len)
 671                 return len;
 672
 673         if (maxsize < NFS_FHSIZE)
 674                 return -EINVAL;
 675         if (maxsize > NFS3_FHSIZE)
 676                 maxsize = NFS3_FHSIZE;
 677
 678         if (qword_get(&mesg, mesg, size)>0)
 679                 return -EINVAL;
 680
 681         /* we have all the words, they are in buf.. */
 682         dom = unix_domain_find(dname);
 683         if (!dom)
 684                 return -ENOMEM;
 685
 686         len = exp_rootfh(dom, path, &fh,  maxsize);
 687         auth_domain_put(dom);
 688         if (len)
 689                 return len;
 690
 691         mesg = buf;
 692         len = SIMPLE_TRANSACTION_LIMIT;
 693         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 694         mesg[-1] = '\n';
 695         return mesg - buf;
 696 }
 697
 698 /**
 699  * write_threads - Start NFSD, or report the current number of running threads
 700  *
 701  * Input:
 702  *                      buf:            ignored
 703  *                      size:           zero
 704  * Output:
 705  *      On success:     passed-in buffer filled with '\n'-terminated C
 706  *                      string numeric value representing the number of
 707  *                      running NFSD threads;
 708  *                      return code is the size in bytes of the string
 709  *      On error:       return code is zero
 710  *
 711  * OR
 712  *
 713  * Input:
 714  *                      buf:            C string containing an unsigned
 715  *                                      integer value representing the
 716  *                                      number of NFSD threads to start
 717  *                      size:           non-zero length of C string in @buf
 718  * Output:
 719  *      On success:     NFS service is started;
 720  *                      passed-in buffer filled with '\n'-terminated C
 721  *                      string numeric value representing the number of
 722  *                      running NFSD threads;
 723  *                      return code is the size in bytes of the string
 724  *      On error:       return code is zero or a negative errno value
 725  */
 726 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 727 {
 728         char *mesg = buf;
 729         int rv;
 730         if (size > 0) {
 731                 int newthreads;
 732                 rv = get_int(&mesg, &newthreads);
 733                 if (rv)
 734                         return rv;
 735                 if (newthreads < 0)
 736                         return -EINVAL;
 737                 rv = nfsd_svc(NFS_PORT, newthreads);
 738                 if (rv < 0)
 739                         return rv;
 740         } else
 741                 rv = nfsd_nrthreads();
 742
 743         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 744 }
 745
 746 /**
 747  * write_pool_threads - Set or report the current number of threads per pool
 748  *
 749  * Input:
 750  *                      buf:            ignored
 751  *                      size:           zero
 752  *
 753  * OR
 754  *
 755  * Input:
 756  *                      buf:            C string containing whitespace-
 757  *                                      separated unsigned integer values
 758  *                                      representing the number of NFSD
 759  *                                      threads to start in each pool
 760  *                      size:           non-zero length of C string in @buf
 761  * Output:
 762  *      On success:     passed-in buffer filled with '\n'-terminated C
 763  *                      string containing integer values representing the
 764  *                      number of NFSD threads in each pool;
 765  *                      return code is the size in bytes of the string
 766  *      On error:       return code is zero or a negative errno value
 767  */
 768 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 769 {
 770         /* if size > 0, look for an array of number of threads per node
 771          * and apply them  then write out number of threads per node as reply
 772          */
 773         char *mesg = buf;
 774         int i;
 775         int rv;
 776         int len;
 777         int npools;
 778         int *nthreads;
 779
 780         mutex_lock(&nfsd_mutex);
 781         npools = nfsd_nrpools();
 782         if (npools == 0) {
 783                 /*
 784                  * NFS is shut down.  The admin can start it by
 785                  * writing to the threads file but NOT the pool_threads
 786                  * file, sorry.  Report zero threads.
 787                  */
 788                 mutex_unlock(&nfsd_mutex);
 789                 strcpy(buf, "0\n");
 790                 return strlen(buf);
 791         }
 792
 793         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 794         rv = -ENOMEM;
 795         if (nthreads == NULL)
 796                 goto out_free;
 797
 798         if (size > 0) {
 799                 for (i = 0; i < npools; i++) {
 800                         rv = get_int(&mesg, &nthreads[i]);
 801                         if (rv == -ENOENT)
 802                                 break;          /* fewer numbers than pools */
 803                         if (rv)
 804                                 goto out_free;  /* syntax error */
 805                         rv = -EINVAL;
 806                         if (nthreads[i] < 0)
 807                                 goto out_free;
 808                 }
 809                 rv = nfsd_set_nrthreads(i, nthreads);
 810                 if (rv)
 811                         goto out_free;
 812         }
 813
 814         rv = nfsd_get_nrthreads(npools, nthreads);
 815         if (rv)
 816                 goto out_free;
 817
 818         mesg = buf;
 819         size = SIMPLE_TRANSACTION_LIMIT;
 820         for (i = 0; i < npools && size > 0; i++) {
 821                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 822                 len = strlen(mesg);
 823                 size -= len;
 824                 mesg += len;
 825         }
 826         rv = mesg - buf;
 827 out_free:
 828         kfree(nthreads);
 829         mutex_unlock(&nfsd_mutex);
 830         return rv;
 831 }
 832
 833 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 834 {
 835         char *mesg = buf;
 836         char *vers, *minorp, sign;
 837         int len, num, remaining;
 838         unsigned minor;
 839         ssize_t tlen = 0;
 840         char *sep;
 841
 842         if (size>0) {
 843                 if (nfsd_serv)
 844                         /* Cannot change versions without updating
 845                          * nfsd_serv->sv_xdrsize, and reallocing
 846                          * rq_argp and rq_resp
 847                          */
 848                         return -EBUSY;
 849                 if (buf[size-1] != '\n')
 850                         return -EINVAL;
 851                 buf[size-1] = 0;
 852
 853                 vers = mesg;
 854                 len = qword_get(&mesg, vers, size);
 855                 if (len <= 0) return -EINVAL;
 856                 do {
 857                         sign = *vers;
 858                         if (sign == '+' || sign == '-')
 859                                 num = simple_strtol((vers+1), &minorp, 0);
 860                         else
 861                                 num = simple_strtol(vers, &minorp, 0);
 862                         if (*minorp == '.') {
 863                                 if (num < 4)
 864                                         return -EINVAL;
 865                                 minor = simple_strtoul(minorp+1, NULL, 0);
 866                                 if (minor == 0)
 867                                         return -EINVAL;
 868                                 if (nfsd_minorversion(minor, sign == '-' ?
 869                                                      NFSD_CLEAR : NFSD_SET) < 0)
 870                                         return -EINVAL;
 871                                 goto next;
 872                         }
 873                         switch(num) {
 874                         case 2:
 875                         case 3:
 876                         case 4:
 877                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 878                                 break;
 879                         default:
 880                                 return -EINVAL;
 881                         }
 882                 next:
 883                         vers += len + 1;
 884                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 885                 /* If all get turned off, turn them back on, as
 886                  * having no versions is BAD
 887                  */
 888                 nfsd_reset_versions();
 889         }
 890
 891         /* Now write current state into reply buffer */
 892         len = 0;
 893         sep = "";
 894         remaining = SIMPLE_TRANSACTION_LIMIT;
 895         for (num=2 ; num <= 4 ; num++)
 896                 if (nfsd_vers(num, NFSD_AVAIL)) {
 897                         len = snprintf(buf, remaining, "%s%c%d", sep,
 898                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 899                                        num);
 900                         sep = " ";
 901
 902                         if (len > remaining)
 903                                 break;
 904                         remaining -= len;
 905                         buf += len;
 906                         tlen += len;
 907                 }
 908         if (nfsd_vers(4, NFSD_AVAIL))
 909                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 910                      minor++) {
 911                         len = snprintf(buf, remaining, " %c4.%u",
 912                                         (nfsd_vers(4, NFSD_TEST) &&
 913                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 914                                                 '+' : '-',
 915                                         minor);
 916
 917                         if (len > remaining)
 918                                 break;
 919                         remaining -= len;
 920                         buf += len;
 921                         tlen += len;
 922                 }
 923
 924         len = snprintf(buf, remaining, "\n");
 925         if (len > remaining)
 926                 return -EINVAL;
 927         return tlen + len;
 928 }
 929
 930 /**
 931  * write_versions - Set or report the available NFS protocol versions
 932  *
 933  * Input:
 934  *                      buf:            ignored
 935  *                      size:           zero
 936  * Output:
 937  *      On success:     passed-in buffer filled with '\n'-terminated C
 938  *                      string containing positive or negative integer
 939  *                      values representing the current status of each
 940  *                      protocol version;
 941  *                      return code is the size in bytes of the string
 942  *      On error:       return code is zero or a negative errno value
 943  *
 944  * OR
 945  *
 946  * Input:
 947  *                      buf:            C string containing whitespace-
 948  *                                      separated positive or negative
 949  *                                      integer values representing NFS
 950  *                                      protocol versions to enable ("+n")
 951  *                                      or disable ("-n")
 952  *                      size:           non-zero length of C string in @buf
 953  * Output:
 954  *      On success:     status of zero or more protocol versions has
 955  *                      been updated; passed-in buffer filled with
 956  *                      '\n'-terminated C string containing positive
 957  *                      or negative integer values representing the
 958  *                      current status of each protocol version;
 959  *                      return code is the size in bytes of the string
 960  *      On error:       return code is zero or a negative errno value
 961  */
 962 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 963 {
 964         ssize_t rv;
 965
 966         mutex_lock(&nfsd_mutex);
 967         rv = __write_versions(file, buf, size);
 968         mutex_unlock(&nfsd_mutex);
 969         return rv;
 970 }
 971
 972 /*
 973  * Zero-length write.  Return a list of NFSD's current listener
 974  * transports.
 975  */
 976 static ssize_t __write_ports_names(char *buf)
 977 {
 978         if (nfsd_serv == NULL)
 979                 return 0;
 980         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 981 }
 982
 983 /*
 984  * A single 'fd' number was written, in which case it must be for
 985  * a socket of a supported family/protocol, and we use it as an
 986  * nfsd listener.
 987  */
 988 static ssize_t __write_ports_addfd(char *buf)
 989 {
 990         char *mesg = buf;
 991         int fd, err;
 992
 993         err = get_int(&mesg, &fd);
 994         if (err != 0 || fd < 0)
 995                 return -EINVAL;
 996
 997         err = nfsd_create_serv();
 998         if (err != 0)
 999                 return err;
1000
1001         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
1002         if (err < 0) {
1003                 svc_destroy(nfsd_serv);
1004                 return err;
1005         }
1006
1007         /* Decrease the count, but don't shut down the service */
1008         nfsd_serv->sv_nrthreads--;
1009         return err;
1010 }
1011
1012 /*
1013  * A '-' followed by the 'name' of a socket means we close the socket.
1014  */
1015 static ssize_t __write_ports_delfd(char *buf)
1016 {
1017         char *toclose;
1018         int len = 0;
1019
1020         toclose = kstrdup(buf + 1, GFP_KERNEL);
1021         if (toclose == NULL)
1022                 return -ENOMEM;
1023
1024         if (nfsd_serv != NULL)
1025                 len = svc_sock_names(nfsd_serv, buf,
1026                                         SIMPLE_TRANSACTION_LIMIT, toclose);
1027         kfree(toclose);
1028         return len;
1029 }
1030
1031 /*
1032  * A transport listener is added by writing it's transport name and
1033  * a port number.
1034  */
1035 static ssize_t __write_ports_addxprt(char *buf)
1036 {
1037         char transport[16];
1038         struct svc_xprt *xprt;
1039         int port, err;
1040
1041         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1042                 return -EINVAL;
1043
1044         if (port < 1 || port > USHRT_MAX)
1045                 return -EINVAL;
1046
1047         err = nfsd_create_serv();
1048         if (err != 0)
1049                 return err;
1050
1051         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1052                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1053         if (err < 0)
1054                 goto out_err;
1055
1056         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1057                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1058         if (err < 0 && err != -EAFNOSUPPORT)
1059                 goto out_close;
1060
1061         /* Decrease the count, but don't shut down the service */
1062         nfsd_serv->sv_nrthreads--;
1063         return 0;
1064 out_close:
1065         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1066         if (xprt != NULL) {
1067                 svc_close_xprt(xprt);
1068                 svc_xprt_put(xprt);
1069         }
1070 out_err:
1071         svc_destroy(nfsd_serv);
1072         return err;
1073 }
1074
1075 /*
1076  * A transport listener is removed by writing a "-", it's transport
1077  * name, and it's port number.
1078  */
1079 static ssize_t __write_ports_delxprt(char *buf)
1080 {
1081         struct svc_xprt *xprt;
1082         char transport[16];
1083         int port;
1084
1085         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1086                 return -EINVAL;
1087
1088         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1089                 return -EINVAL;
1090
1091         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1092         if (xprt == NULL)
1093                 return -ENOTCONN;
1094
1095         svc_close_xprt(xprt);
1096         svc_xprt_put(xprt);
1097         return 0;
1098 }
1099
1100 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1101 {
1102         if (size == 0)
1103                 return __write_ports_names(buf);
1104
1105         if (isdigit(buf[0]))
1106                 return __write_ports_addfd(buf);
1107
1108         if (buf[0] == '-' && isdigit(buf[1]))
1109                 return __write_ports_delfd(buf);
1110
1111         if (isalpha(buf[0]))
1112                 return __write_ports_addxprt(buf);
1113
1114         if (buf[0] == '-' && isalpha(buf[1]))
1115                 return __write_ports_delxprt(buf);
1116
1117         return -EINVAL;
1118 }
1119
1120 /**
1121  * write_ports - Pass a socket file descriptor or transport name to listen on
1122  *
1123  * Input:
1124  *                      buf:            ignored
1125  *                      size:           zero
1126  * Output:
1127  *      On success:     passed-in buffer filled with a '\n'-terminated C
1128  *                      string containing a whitespace-separated list of
1129  *                      named NFSD listeners;
1130  *                      return code is the size in bytes of the string
1131  *      On error:       return code is zero or a negative errno value
1132  *
1133  * OR
1134  *
1135  * Input:
1136  *                      buf:            C string containing an unsigned
1137  *                                      integer value representing a bound
1138  *                                      but unconnected socket that is to be
1139  *                                      used as an NFSD listener; listen(3)
1140  *                                      must be called for a SOCK_STREAM
1141  *                                      socket, otherwise it is ignored
1142  *                      size:           non-zero length of C string in @buf
1143  * Output:
1144  *      On success:     NFS service is started;
1145  *                      passed-in buffer filled with a '\n'-terminated C
1146  *                      string containing a unique alphanumeric name of
1147  *                      the listener;
1148  *                      return code is the size in bytes of the string
1149  *      On error:       return code is a negative errno value
1150  *
1151  * OR
1152  *
1153  * Input:
1154  *                      buf:            C string containing a "-" followed
1155  *                                      by an integer value representing a
1156  *                                      previously passed in socket file
1157  *                                      descriptor
1158  *                      size:           non-zero length of C string in @buf
1159  * Output:
1160  *      On success:     NFS service no longer listens on that socket;
1161  *                      passed-in buffer filled with a '\n'-terminated C
1162  *                      string containing a unique name of the listener;
1163  *                      return code is the size in bytes of the string
1164  *      On error:       return code is a negative errno value
1165  *
1166  * OR
1167  *
1168  * Input:
1169  *                      buf:            C string containing a transport
1170  *                                      name and an unsigned integer value
1171  *                                      representing the port to listen on,
1172  *                                      separated by whitespace
1173  *                      size:           non-zero length of C string in @buf
1174  * Output:
1175  *      On success:     returns zero; NFS service is started
1176  *      On error:       return code is a negative errno value
1177  *
1178  * OR
1179  *
1180  * Input:
1181  *                      buf:            C string containing a "-" followed
1182  *                                      by a transport name and an unsigned
1183  *                                      integer value representing the port
1184  *                                      to listen on, separated by whitespace
1185  *                      size:           non-zero length of C string in @buf
1186  * Output:
1187  *      On success:     returns zero; NFS service no longer listens
1188  *                      on that transport
1189  *      On error:       return code is a negative errno value
1190  */
1191 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1192 {
1193         ssize_t rv;
1194
1195         mutex_lock(&nfsd_mutex);
1196         rv = __write_ports(file, buf, size);
1197         mutex_unlock(&nfsd_mutex);
1198         return rv;
1199 }
1200
1201
1202 int nfsd_max_blksize;
1203
1204 /**
1205  * write_maxblksize - Set or report the current NFS blksize
1206  *
1207  * Input:
1208  *                      buf:            ignored
1209  *                      size:           zero
1210  *
1211  * OR
1212  *
1213  * Input:
1214  *                      buf:            C string containing an unsigned
1215  *                                      integer value representing the new
1216  *                                      NFS blksize
1217  *                      size:           non-zero length of C string in @buf
1218  * Output:
1219  *      On success:     passed-in buffer filled with '\n'-terminated C string
1220  *                      containing numeric value of the current NFS blksize
1221  *                      setting;
1222  *                      return code is the size in bytes of the string
1223  *      On error:       return code is zero or a negative errno value
1224  */
1225 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1226 {
1227         char *mesg = buf;
1228         if (size > 0) {
1229                 int bsize;
1230                 int rv = get_int(&mesg, &bsize);
1231                 if (rv)
1232                         return rv;
1233                 /* force bsize into allowed range and
1234                  * required alignment.
1235                  */
1236                 if (bsize < 1024)
1237                         bsize = 1024;
1238                 if (bsize > NFSSVC_MAXBLKSIZE)
1239                         bsize = NFSSVC_MAXBLKSIZE;
1240                 bsize &= ~(1024-1);
1241                 mutex_lock(&nfsd_mutex);
1242                 if (nfsd_serv) {
1243                         mutex_unlock(&nfsd_mutex);
1244                         return -EBUSY;
1245                 }
1246                 nfsd_max_blksize = bsize;
1247                 mutex_unlock(&nfsd_mutex);
1248         }
1249
1250         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1251                                                         nfsd_max_blksize);
1252 }
1253
1254 #ifdef CONFIG_NFSD_V4
1255 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1256 {
1257         char *mesg = buf;
1258         int rv, i;
1259
1260         if (size > 0) {
1261                 if (nfsd_serv)
1262                         return -EBUSY;
1263                 rv = get_int(&mesg, &i);
1264                 if (rv)
1265                         return rv;
1266                 /*
1267                  * Some sanity checking.  We don't have a reason for
1268                  * these particular numbers, but problems with the
1269                  * extremes are:
1270                  *      - Too short: the briefest network outage may
1271                  *        cause clients to lose all their locks.  Also,
1272                  *        the frequent polling may be wasteful.
1273                  *      - Too long: do you really want reboot recovery
1274                  *        to take more than an hour?  Or to make other
1275                  *        clients wait an hour before being able to
1276                  *        revoke a dead client's locks?
1277                  */
1278                 if (i < 10 || i > 3600)
1279                         return -EINVAL;
1280                 *time = i;
1281         }
1282
1283         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1284 }
1285
1286 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1287 {
1288         ssize_t rv;
1289
1290         mutex_lock(&nfsd_mutex);
1291         rv = __nfsd4_write_time(file, buf, size, time);
1292         mutex_unlock(&nfsd_mutex);
1293         return rv;
1294 }
1295
1296 /**
1297  * write_leasetime - Set or report the current NFSv4 lease time
1298  *
1299  * Input:
1300  *                      buf:            ignored
1301  *                      size:           zero
1302  *
1303  * OR
1304  *
1305  * Input:
1306  *                      buf:            C string containing an unsigned
1307  *                                      integer value representing the new
1308  *                                      NFSv4 lease expiry time
1309  *                      size:           non-zero length of C string in @buf
1310  * Output:
1311  *      On success:     passed-in buffer filled with '\n'-terminated C
1312  *                      string containing unsigned integer value of the
1313  *                      current lease expiry time;
1314  *                      return code is the size in bytes of the string
1315  *      On error:       return code is zero or a negative errno value
1316  */
1317 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1318 {
1319         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1320 }
1321
1322 /**
1323  * write_gracetime - Set or report current NFSv4 grace period time
1324  *
1325  * As above, but sets the time of the NFSv4 grace period.
1326  *
1327  * Note this should never be set to less than the *previous*
1328  * lease-period time, but we don't try to enforce this.  (In the common
1329  * case (a new boot), we don't know what the previous lease time was
1330  * anyway.)
1331  */
1332 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1333 {
1334         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1335 }
1336
1337 extern char *nfs4_recoverydir(void);
1338
1339 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1340 {
1341         char *mesg = buf;
1342         char *recdir;
1343         int len, status;
1344
1345         if (size > 0) {
1346                 if (nfsd_serv)
1347                         return -EBUSY;
1348                 if (size > PATH_MAX || buf[size-1] != '\n')
1349                         return -EINVAL;
1350                 buf[size-1] = 0;
1351
1352                 recdir = mesg;
1353                 len = qword_get(&mesg, recdir, size);
1354                 if (len <= 0)
1355                         return -EINVAL;
1356
1357                 status = nfs4_reset_recoverydir(recdir);
1358                 if (status)
1359                         return status;
1360         }
1361
1362         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1363                                                         nfs4_recoverydir());
1364 }
1365
1366 /**
1367  * write_recoverydir - Set or report the pathname of the recovery directory
1368  *
1369  * Input:
1370  *                      buf:            ignored
1371  *                      size:           zero
1372  *
1373  * OR
1374  *
1375  * Input:
1376  *                      buf:            C string containing the pathname
1377  *                                      of the directory on a local file
1378  *                                      system containing permanent NFSv4
1379  *                                      recovery data
1380  *                      size:           non-zero length of C string in @buf
1381  * Output:
1382  *      On success:     passed-in buffer filled with '\n'-terminated C string
1383  *                      containing the current recovery pathname setting;
1384  *                      return code is the size in bytes of the string
1385  *      On error:       return code is zero or a negative errno value
1386  */
1387 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1388 {
1389         ssize_t rv;
1390
1391         mutex_lock(&nfsd_mutex);
1392         rv = __write_recoverydir(file, buf, size);
1393         mutex_unlock(&nfsd_mutex);
1394         return rv;
1395 }
1396
1397 #endif
1398
1399 /*----------------------------------------------------------------------------*/
1400 /*
1401  *      populating the filesystem.
1402  */
1403
1404 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1405 {
1406         static struct tree_descr nfsd_files[] = {
1407 #ifdef CONFIG_NFSD_DEPRECATED
1408                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1409                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1410                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1411                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1412                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1413                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1414                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1415 #endif
1416                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1417                 [NFSD_Export_features] = {"export_features",
1418                                         &export_features_operations, S_IRUGO},
1419                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1420                                         &transaction_ops, S_IWUSR|S_IRUSR},
1421                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1422                                         &transaction_ops, S_IWUSR|S_IRUSR},
1423                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1424                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1425                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1426                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1427                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1428                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1429                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1430 #ifdef CONFIG_SUNRPC_GSS
1431                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1432 #endif /* CONFIG_SUNRPC_GSS */
1433 #ifdef CONFIG_NFSD_V4
1434                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1435                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1436                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1437 #endif
1438                 /* last one */ {""}
1439         };
1440         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1441 }
1442
1443 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1444         int flags, const char *dev_name, void *data)
1445 {
1446         return mount_single(fs_type, flags, data, nfsd_fill_super);
1447 }
1448
1449 static struct file_system_type nfsd_fs_type = {
1450         .owner          = THIS_MODULE,
1451         .name           = "nfsd",
1452         .mount          = nfsd_mount,
1453         .kill_sb        = kill_litter_super,
1454 };
1455
1456 #ifdef CONFIG_PROC_FS
1457 static int create_proc_exports_entry(void)
1458 {
1459         struct proc_dir_entry *entry;
1460
1461         entry = proc_mkdir("fs/nfs", NULL);
1462         if (!entry)
1463                 return -ENOMEM;
1464         entry = proc_create("exports", 0, entry, &exports_operations);
1465         if (!entry)
1466                 return -ENOMEM;
1467         return 0;
1468 }
1469 #else /* CONFIG_PROC_FS */
1470 static int create_proc_exports_entry(void)
1471 {
1472         return 0;
1473 }
1474 #endif
1475
1476 static int __init init_nfsd(void)
1477 {
1478         int retval;
1479         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1480
1481         retval = nfs4_state_init(); /* nfs4 locking state */
1482         if (retval)
1483                 return retval;
1484         nfsd_stat_init();       /* Statistics */
1485         retval = nfsd_reply_cache_init();
1486         if (retval)
1487                 goto out_free_stat;
1488         retval = nfsd_export_init();
1489         if (retval)
1490                 goto out_free_cache;
1491         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1492         retval = nfsd_idmap_init();
1493         if (retval)
1494                 goto out_free_lockd;
1495         retval = create_proc_exports_entry();
1496         if (retval)
1497                 goto out_free_idmap;
1498         retval = register_filesystem(&nfsd_fs_type);
1499         if (retval)
1500                 goto out_free_all;
1501         return 0;
1502 out_free_all:
1503         remove_proc_entry("fs/nfs/exports", NULL);
1504         remove_proc_entry("fs/nfs", NULL);
1505 out_free_idmap:
1506         nfsd_idmap_shutdown();
1507 out_free_lockd:
1508         nfsd_lockd_shutdown();
1509         nfsd_export_shutdown();
1510 out_free_cache:
1511         nfsd_reply_cache_shutdown();
1512 out_free_stat:
1513         nfsd_stat_shutdown();
1514         nfsd4_free_slabs();
1515         return retval;
1516 }
1517
1518 static void __exit exit_nfsd(void)
1519 {
1520         nfsd_export_shutdown();
1521         nfsd_reply_cache_shutdown();
1522         remove_proc_entry("fs/nfs/exports", NULL);
1523         remove_proc_entry("fs/nfs", NULL);
1524         nfsd_stat_shutdown();
1525         nfsd_lockd_shutdown();
1526         nfsd_idmap_shutdown();
1527         nfsd4_free_slabs();
1528         unregister_filesystem(&nfsd_fs_type);
1529 }
1530
1531 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1532 MODULE_LICENSE("GPL");
1533 module_init(init_nfsd)
1534 module_exit(exit_nfsd)