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   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/module.h>
  10
  11 #include <linux/linkage.h>
  12 #include <linux/time.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/net.h>
  17 #include <linux/in.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/unistd.h>
  20 #include <linux/slab.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/pagemap.h>
  24 #include <linux/init.h>
  25 #include <linux/inet.h>
  26 #include <linux/string.h>
  27 #include <linux/smp_lock.h>
  28 #include <linux/ctype.h>
  29
  30 #include <linux/nfs.h>
  31 #include <linux/nfsd_idmap.h>
  32 #include <linux/lockd/bind.h>
  33 #include <linux/sunrpc/svc.h>
  34 #include <linux/sunrpc/svcsock.h>
  35 #include <linux/nfsd/nfsd.h>
  36 #include <linux/nfsd/cache.h>
  37 #include <linux/nfsd/xdr.h>
  38 #include <linux/nfsd/syscall.h>
  39 #include <linux/lockd/lockd.h>
  40
  41 #include <asm/uaccess.h>
  42 #include <net/ipv6.h>
  43
  44 /*
  45  *      We have a single directory with 9 nodes in it.
  46  */
  47 enum {
  48         NFSD_Root = 1,
  49         NFSD_Svc,
  50         NFSD_Add,
  51         NFSD_Del,
  52         NFSD_Export,
  53         NFSD_Unexport,
  54         NFSD_Getfd,
  55         NFSD_Getfs,
  56         NFSD_List,
  57         NFSD_Fh,
  58         NFSD_FO_UnlockIP,
  59         NFSD_Threads,
  60         NFSD_Pool_Threads,
  61         NFSD_Versions,
  62         NFSD_Ports,
  63         NFSD_MaxBlkSize,
  64         /*
  65          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  66          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  67          */
  68 #ifdef CONFIG_NFSD_V4
  69         NFSD_Leasetime,
  70         NFSD_RecoveryDir,
  71 #endif
  72 };
  73
  74 /*
  75  * write() for these nodes.
  76  */
  77 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  78 static ssize_t write_add(struct file *file, char *buf, size_t size);
  79 static ssize_t write_del(struct file *file, char *buf, size_t size);
  80 static ssize_t write_export(struct file *file, char *buf, size_t size);
  81 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  82 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  83 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  84 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  85 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  86 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  87 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  88 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  89 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  90 #ifdef CONFIG_NFSD_V4
  91 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  92 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  93 #endif
  94
  95 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
  96
  97 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  98         [NFSD_Svc] = write_svc,
  99         [NFSD_Add] = write_add,
 100         [NFSD_Del] = write_del,
 101         [NFSD_Export] = write_export,
 102         [NFSD_Unexport] = write_unexport,
 103         [NFSD_Getfd] = write_getfd,
 104         [NFSD_Getfs] = write_getfs,
 105         [NFSD_Fh] = write_filehandle,
 106         [NFSD_FO_UnlockIP] = failover_unlock_ip,
 107         [NFSD_Threads] = write_threads,
 108         [NFSD_Pool_Threads] = write_pool_threads,
 109         [NFSD_Versions] = write_versions,
 110         [NFSD_Ports] = write_ports,
 111         [NFSD_MaxBlkSize] = write_maxblksize,
 112 #ifdef CONFIG_NFSD_V4
 113         [NFSD_Leasetime] = write_leasetime,
 114         [NFSD_RecoveryDir] = write_recoverydir,
 115 #endif
 116 };
 117
 118 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 119 {
 120         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 121         char *data;
 122         ssize_t rv;
 123
 124         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 125                 return -EINVAL;
 126
 127         data = simple_transaction_get(file, buf, size);
 128         if (IS_ERR(data))
 129                 return PTR_ERR(data);
 130
 131         rv =  write_op[ino](file, data, size);
 132         if (rv >= 0) {
 133                 simple_transaction_set(file, rv);
 134                 rv = size;
 135         }
 136         return rv;
 137 }
 138
 139 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 140 {
 141         if (! file->private_data) {
 142                 /* An attempt to read a transaction file without writing
 143                  * causes a 0-byte write so that the file can return
 144                  * state information
 145                  */
 146                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 147                 if (rv < 0)
 148                         return rv;
 149         }
 150         return simple_transaction_read(file, buf, size, pos);
 151 }
 152
 153 static const struct file_operations transaction_ops = {
 154         .write          = nfsctl_transaction_write,
 155         .read           = nfsctl_transaction_read,
 156         .release        = simple_transaction_release,
 157 };
 158
 159 static int exports_open(struct inode *inode, struct file *file)
 160 {
 161         return seq_open(file, &nfs_exports_op);
 162 }
 163
 164 static const struct file_operations exports_operations = {
 165         .open           = exports_open,
 166         .read           = seq_read,
 167         .llseek         = seq_lseek,
 168         .release        = seq_release,
 169 };
 170
 171 /*----------------------------------------------------------------------------*/
 172 /*
 173  * payload - write methods
 174  * If the method has a response, the response should be put in buf,
 175  * and the length returned.  Otherwise return 0 or and -error.
 176  */
 177
 178 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 179 {
 180         struct nfsctl_svc *data;
 181         if (size < sizeof(*data))
 182                 return -EINVAL;
 183         data = (struct nfsctl_svc*) buf;
 184         return nfsd_svc(data->svc_port, data->svc_nthreads);
 185 }
 186
 187 static ssize_t write_add(struct file *file, char *buf, size_t size)
 188 {
 189         struct nfsctl_client *data;
 190         if (size < sizeof(*data))
 191                 return -EINVAL;
 192         data = (struct nfsctl_client *)buf;
 193         return exp_addclient(data);
 194 }
 195
 196 static ssize_t write_del(struct file *file, char *buf, size_t size)
 197 {
 198         struct nfsctl_client *data;
 199         if (size < sizeof(*data))
 200                 return -EINVAL;
 201         data = (struct nfsctl_client *)buf;
 202         return exp_delclient(data);
 203 }
 204
 205 static ssize_t write_export(struct file *file, char *buf, size_t size)
 206 {
 207         struct nfsctl_export *data;
 208         if (size < sizeof(*data))
 209                 return -EINVAL;
 210         data = (struct nfsctl_export*)buf;
 211         return exp_export(data);
 212 }
 213
 214 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 215 {
 216         struct nfsctl_export *data;
 217
 218         if (size < sizeof(*data))
 219                 return -EINVAL;
 220         data = (struct nfsctl_export*)buf;
 221         return exp_unexport(data);
 222 }
 223
 224 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 225 {
 226         struct nfsctl_fsparm *data;
 227         struct sockaddr_in *sin;
 228         struct auth_domain *clp;
 229         int err = 0;
 230         struct knfsd_fh *res;
 231         struct in6_addr in6;
 232
 233         if (size < sizeof(*data))
 234                 return -EINVAL;
 235         data = (struct nfsctl_fsparm*)buf;
 236         err = -EPROTONOSUPPORT;
 237         if (data->gd_addr.sa_family != AF_INET)
 238                 goto out;
 239         sin = (struct sockaddr_in *)&data->gd_addr;
 240         if (data->gd_maxlen > NFS3_FHSIZE)
 241                 data->gd_maxlen = NFS3_FHSIZE;
 242
 243         res = (struct knfsd_fh*)buf;
 244
 245         exp_readlock();
 246
 247         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 248
 249         clp = auth_unix_lookup(&in6);
 250         if (!clp)
 251                 err = -EPERM;
 252         else {
 253                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 254                 auth_domain_put(clp);
 255         }
 256         exp_readunlock();
 257         if (err == 0)
 258                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 259  out:
 260         return err;
 261 }
 262
 263 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 264 {
 265         struct nfsctl_fdparm *data;
 266         struct sockaddr_in *sin;
 267         struct auth_domain *clp;
 268         int err = 0;
 269         struct knfsd_fh fh;
 270         char *res;
 271         struct in6_addr in6;
 272
 273         if (size < sizeof(*data))
 274                 return -EINVAL;
 275         data = (struct nfsctl_fdparm*)buf;
 276         err = -EPROTONOSUPPORT;
 277         if (data->gd_addr.sa_family != AF_INET)
 278                 goto out;
 279         err = -EINVAL;
 280         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 281                 goto out;
 282
 283         res = buf;
 284         sin = (struct sockaddr_in *)&data->gd_addr;
 285         exp_readlock();
 286
 287         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 288
 289         clp = auth_unix_lookup(&in6);
 290         if (!clp)
 291                 err = -EPERM;
 292         else {
 293                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 294                 auth_domain_put(clp);
 295         }
 296         exp_readunlock();
 297
 298         if (err == 0) {
 299                 memset(res,0, NFS_FHSIZE);
 300                 memcpy(res, &fh.fh_base, fh.fh_size);
 301                 err = NFS_FHSIZE;
 302         }
 303  out:
 304         return err;
 305 }
 306
 307 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
 308 {
 309         __be32 server_ip;
 310         char *fo_path, c;
 311         int b1, b2, b3, b4;
 312
 313         /* sanity check */
 314         if (size == 0)
 315                 return -EINVAL;
 316
 317         if (buf[size-1] != '\n')
 318                 return -EINVAL;
 319
 320         fo_path = buf;
 321         if (qword_get(&buf, fo_path, size) < 0)
 322                 return -EINVAL;
 323
 324         /* get ipv4 address */
 325         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 326                 return -EINVAL;
 327         server_ip = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
 328
 329         return nlmsvc_unlock_all_by_ip(server_ip);
 330 }
 331
 332 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 333 {
 334         /* request is:
 335          *   domain path maxsize
 336          * response is
 337          *   filehandle
 338          *
 339          * qword quoting is used, so filehandle will be \x....
 340          */
 341         char *dname, *path;
 342         int uninitialized_var(maxsize);
 343         char *mesg = buf;
 344         int len;
 345         struct auth_domain *dom;
 346         struct knfsd_fh fh;
 347
 348         if (size == 0)
 349                 return -EINVAL;
 350
 351         if (buf[size-1] != '\n')
 352                 return -EINVAL;
 353         buf[size-1] = 0;
 354
 355         dname = mesg;
 356         len = qword_get(&mesg, dname, size);
 357         if (len <= 0) return -EINVAL;
 358
 359         path = dname+len+1;
 360         len = qword_get(&mesg, path, size);
 361         if (len <= 0) return -EINVAL;
 362
 363         len = get_int(&mesg, &maxsize);
 364         if (len)
 365                 return len;
 366
 367         if (maxsize < NFS_FHSIZE)
 368                 return -EINVAL;
 369         if (maxsize > NFS3_FHSIZE)
 370                 maxsize = NFS3_FHSIZE;
 371
 372         if (qword_get(&mesg, mesg, size)>0)
 373                 return -EINVAL;
 374
 375         /* we have all the words, they are in buf.. */
 376         dom = unix_domain_find(dname);
 377         if (!dom)
 378                 return -ENOMEM;
 379
 380         len = exp_rootfh(dom, path, &fh,  maxsize);
 381         auth_domain_put(dom);
 382         if (len)
 383                 return len;
 384
 385         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 386         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 387         mesg[-1] = '\n';
 388         return mesg - buf;
 389 }
 390
 391 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 392 {
 393         /* if size > 0, look for a number of threads and call nfsd_svc
 394          * then write out number of threads as reply
 395          */
 396         char *mesg = buf;
 397         int rv;
 398         if (size > 0) {
 399                 int newthreads;
 400                 rv = get_int(&mesg, &newthreads);
 401                 if (rv)
 402                         return rv;
 403                 if (newthreads <0)
 404                         return -EINVAL;
 405                 rv = nfsd_svc(2049, newthreads);
 406                 if (rv)
 407                         return rv;
 408         }
 409         sprintf(buf, "%d\n", nfsd_nrthreads());
 410         return strlen(buf);
 411 }
 412
 413 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 414 {
 415         /* if size > 0, look for an array of number of threads per node
 416          * and apply them  then write out number of threads per node as reply
 417          */
 418         char *mesg = buf;
 419         int i;
 420         int rv;
 421         int len;
 422         int npools = nfsd_nrpools();
 423         int *nthreads;
 424
 425         if (npools == 0) {
 426                 /*
 427                  * NFS is shut down.  The admin can start it by
 428                  * writing to the threads file but NOT the pool_threads
 429                  * file, sorry.  Report zero threads.
 430                  */
 431                 strcpy(buf, "0\n");
 432                 return strlen(buf);
 433         }
 434
 435         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 436         if (nthreads == NULL)
 437                 return -ENOMEM;
 438
 439         if (size > 0) {
 440                 for (i = 0; i < npools; i++) {
 441                         rv = get_int(&mesg, &nthreads[i]);
 442                         if (rv == -ENOENT)
 443                                 break;          /* fewer numbers than pools */
 444                         if (rv)
 445                                 goto out_free;  /* syntax error */
 446                         rv = -EINVAL;
 447                         if (nthreads[i] < 0)
 448                                 goto out_free;
 449                 }
 450                 rv = nfsd_set_nrthreads(i, nthreads);
 451                 if (rv)
 452                         goto out_free;
 453         }
 454
 455         rv = nfsd_get_nrthreads(npools, nthreads);
 456         if (rv)
 457                 goto out_free;
 458
 459         mesg = buf;
 460         size = SIMPLE_TRANSACTION_LIMIT;
 461         for (i = 0; i < npools && size > 0; i++) {
 462                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 463                 len = strlen(mesg);
 464                 size -= len;
 465                 mesg += len;
 466         }
 467
 468         return (mesg-buf);
 469
 470 out_free:
 471         kfree(nthreads);
 472         return rv;
 473 }
 474
 475 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 476 {
 477         /*
 478          * Format:
 479          *   [-/+]vers [-/+]vers ...
 480          */
 481         char *mesg = buf;
 482         char *vers, sign;
 483         int len, num;
 484         ssize_t tlen = 0;
 485         char *sep;
 486
 487         if (size>0) {
 488                 if (nfsd_serv)
 489                         /* Cannot change versions without updating
 490                          * nfsd_serv->sv_xdrsize, and reallocing
 491                          * rq_argp and rq_resp
 492                          */
 493                         return -EBUSY;
 494                 if (buf[size-1] != '\n')
 495                         return -EINVAL;
 496                 buf[size-1] = 0;
 497
 498                 vers = mesg;
 499                 len = qword_get(&mesg, vers, size);
 500                 if (len <= 0) return -EINVAL;
 501                 do {
 502                         sign = *vers;
 503                         if (sign == '+' || sign == '-')
 504                                 num = simple_strtol((vers+1), NULL, 0);
 505                         else
 506                                 num = simple_strtol(vers, NULL, 0);
 507                         switch(num) {
 508                         case 2:
 509                         case 3:
 510                         case 4:
 511                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 512                                 break;
 513                         default:
 514                                 return -EINVAL;
 515                         }
 516                         vers += len + 1;
 517                         tlen += len;
 518                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 519                 /* If all get turned off, turn them back on, as
 520                  * having no versions is BAD
 521                  */
 522                 nfsd_reset_versions();
 523         }
 524         /* Now write current state into reply buffer */
 525         len = 0;
 526         sep = "";
 527         for (num=2 ; num <= 4 ; num++)
 528                 if (nfsd_vers(num, NFSD_AVAIL)) {
 529                         len += sprintf(buf+len, "%s%c%d", sep,
 530                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 531                                        num);
 532                         sep = " ";
 533                 }
 534         len += sprintf(buf+len, "\n");
 535         return len;
 536 }
 537
 538 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 539 {
 540         if (size == 0) {
 541                 int len = 0;
 542                 lock_kernel();
 543                 if (nfsd_serv)
 544                         len = svc_xprt_names(nfsd_serv, buf, 0);
 545                 unlock_kernel();
 546                 return len;
 547         }
 548         /* Either a single 'fd' number is written, in which
 549          * case it must be for a socket of a supported family/protocol,
 550          * and we use it as an nfsd socket, or
 551          * A '-' followed by the 'name' of a socket in which case
 552          * we close the socket.
 553          */
 554         if (isdigit(buf[0])) {
 555                 char *mesg = buf;
 556                 int fd;
 557                 int err;
 558                 err = get_int(&mesg, &fd);
 559                 if (err)
 560                         return -EINVAL;
 561                 if (fd < 0)
 562                         return -EINVAL;
 563                 err = nfsd_create_serv();
 564                 if (!err) {
 565                         int proto = 0;
 566                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
 567                         if (err >= 0) {
 568                                 err = lockd_up(proto);
 569                                 if (err < 0)
 570                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 571                         }
 572                         /* Decrease the count, but don't shutdown the
 573                          * the service
 574                          */
 575                         lock_kernel();
 576                         nfsd_serv->sv_nrthreads--;
 577                         unlock_kernel();
 578                 }
 579                 return err < 0 ? err : 0;
 580         }
 581         if (buf[0] == '-' && isdigit(buf[1])) {
 582                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 583                 int len = 0;
 584                 if (!toclose)
 585                         return -ENOMEM;
 586                 lock_kernel();
 587                 if (nfsd_serv)
 588                         len = svc_sock_names(buf, nfsd_serv, toclose);
 589                 unlock_kernel();
 590                 if (len >= 0)
 591                         lockd_down();
 592                 kfree(toclose);
 593                 return len;
 594         }
 595         /*
 596          * Add a transport listener by writing it's transport name
 597          */
 598         if (isalpha(buf[0])) {
 599                 int err;
 600                 char transport[16];
 601                 int port;
 602                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 603                         err = nfsd_create_serv();
 604                         if (!err) {
 605                                 err = svc_create_xprt(nfsd_serv,
 606                                                       transport, port,
 607                                                       SVC_SOCK_ANONYMOUS);
 608                                 if (err == -ENOENT)
 609                                         /* Give a reasonable perror msg for
 610                                          * bad transport string */
 611                                         err = -EPROTONOSUPPORT;
 612                         }
 613                         return err < 0 ? err : 0;
 614                 }
 615         }
 616         /*
 617          * Remove a transport by writing it's transport name and port number
 618          */
 619         if (buf[0] == '-' && isalpha(buf[1])) {
 620                 struct svc_xprt *xprt;
 621                 int err = -EINVAL;
 622                 char transport[16];
 623                 int port;
 624                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 625                         if (port == 0)
 626                                 return -EINVAL;
 627                         lock_kernel();
 628                         if (nfsd_serv) {
 629                                 xprt = svc_find_xprt(nfsd_serv, transport,
 630                                                      AF_UNSPEC, port);
 631                                 if (xprt) {
 632                                         svc_close_xprt(xprt);
 633                                         svc_xprt_put(xprt);
 634                                         err = 0;
 635                                 } else
 636                                         err = -ENOTCONN;
 637                         }
 638                         unlock_kernel();
 639                         return err < 0 ? err : 0;
 640                 }
 641         }
 642         return -EINVAL;
 643 }
 644
 645 int nfsd_max_blksize;
 646
 647 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 648 {
 649         char *mesg = buf;
 650         if (size > 0) {
 651                 int bsize;
 652                 int rv = get_int(&mesg, &bsize);
 653                 if (rv)
 654                         return rv;
 655                 /* force bsize into allowed range and
 656                  * required alignment.
 657                  */
 658                 if (bsize < 1024)
 659                         bsize = 1024;
 660                 if (bsize > NFSSVC_MAXBLKSIZE)
 661                         bsize = NFSSVC_MAXBLKSIZE;
 662                 bsize &= ~(1024-1);
 663                 lock_kernel();
 664                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 665                         unlock_kernel();
 666                         return -EBUSY;
 667                 }
 668                 nfsd_max_blksize = bsize;
 669                 unlock_kernel();
 670         }
 671         return sprintf(buf, "%d\n", nfsd_max_blksize);
 672 }
 673
 674 #ifdef CONFIG_NFSD_V4
 675 extern time_t nfs4_leasetime(void);
 676
 677 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 678 {
 679         /* if size > 10 seconds, call
 680          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 681          */
 682         char *mesg = buf;
 683         int rv;
 684
 685         if (size > 0) {
 686                 int lease;
 687                 rv = get_int(&mesg, &lease);
 688                 if (rv)
 689                         return rv;
 690                 if (lease < 10 || lease > 3600)
 691                         return -EINVAL;
 692                 nfs4_reset_lease(lease);
 693         }
 694         sprintf(buf, "%ld\n", nfs4_lease_time());
 695         return strlen(buf);
 696 }
 697
 698 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 699 {
 700         char *mesg = buf;
 701         char *recdir;
 702         int len, status;
 703
 704         if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
 705                 return -EINVAL;
 706         buf[size-1] = 0;
 707
 708         recdir = mesg;
 709         len = qword_get(&mesg, recdir, size);
 710         if (len <= 0)
 711                 return -EINVAL;
 712
 713         status = nfs4_reset_recoverydir(recdir);
 714         return strlen(buf);
 715 }
 716 #endif
 717
 718 /*----------------------------------------------------------------------------*/
 719 /*
 720  *      populating the filesystem.
 721  */
 722
 723 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 724 {
 725         static struct tree_descr nfsd_files[] = {
 726                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 727                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 728                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 729                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 730                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 731                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 732                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 733                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 734                 [NFSD_FO_UnlockIP] = {"unlock_ip",
 735                                         &transaction_ops, S_IWUSR|S_IRUSR},
 736                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 737                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 738                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 739                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 740                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 741                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 742 #ifdef CONFIG_NFSD_V4
 743                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 744                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 745 #endif
 746                 /* last one */ {""}
 747         };
 748         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 749 }
 750
 751 static int nfsd_get_sb(struct file_system_type *fs_type,
 752         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 753 {
 754         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 755 }
 756
 757 static struct file_system_type nfsd_fs_type = {
 758         .owner          = THIS_MODULE,
 759         .name           = "nfsd",
 760         .get_sb         = nfsd_get_sb,
 761         .kill_sb        = kill_litter_super,
 762 };
 763
 764 #ifdef CONFIG_PROC_FS
 765 static int create_proc_exports_entry(void)
 766 {
 767         struct proc_dir_entry *entry;
 768
 769         entry = proc_mkdir("fs/nfs", NULL);
 770         if (!entry)
 771                 return -ENOMEM;
 772         entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 773         if (!entry)
 774                 return -ENOMEM;
 775         entry->proc_fops =  &exports_operations;
 776         return 0;
 777 }
 778 #else /* CONFIG_PROC_FS */
 779 static int create_proc_exports_entry(void)
 780 {
 781         return 0;
 782 }
 783 #endif
 784
 785 static int __init init_nfsd(void)
 786 {
 787         int retval;
 788         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 789
 790         retval = nfs4_state_init(); /* nfs4 locking state */
 791         if (retval)
 792                 return retval;
 793         nfsd_stat_init();       /* Statistics */
 794         retval = nfsd_reply_cache_init();
 795         if (retval)
 796                 goto out_free_stat;
 797         retval = nfsd_export_init();
 798         if (retval)
 799                 goto out_free_cache;
 800         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 801         retval = nfsd_idmap_init();
 802         if (retval)
 803                 goto out_free_lockd;
 804         retval = create_proc_exports_entry();
 805         if (retval)
 806                 goto out_free_idmap;
 807         retval = register_filesystem(&nfsd_fs_type);
 808         if (retval)
 809                 goto out_free_all;
 810         return 0;
 811 out_free_all:
 812         remove_proc_entry("fs/nfs/exports", NULL);
 813         remove_proc_entry("fs/nfs", NULL);
 814 out_free_idmap:
 815         nfsd_idmap_shutdown();
 816 out_free_lockd:
 817         nfsd_lockd_shutdown();
 818         nfsd_export_shutdown();
 819 out_free_cache:
 820         nfsd_reply_cache_shutdown();
 821 out_free_stat:
 822         nfsd_stat_shutdown();
 823         nfsd4_free_slabs();
 824         return retval;
 825 }
 826
 827 static void __exit exit_nfsd(void)
 828 {
 829         nfsd_export_shutdown();
 830         nfsd_reply_cache_shutdown();
 831         remove_proc_entry("fs/nfs/exports", NULL);
 832         remove_proc_entry("fs/nfs", NULL);
 833         nfsd_stat_shutdown();
 834         nfsd_lockd_shutdown();
 835         nfsd_idmap_shutdown();
 836         nfsd4_free_slabs();
 837         unregister_filesystem(&nfsd_fs_type);
 838 }
 839
 840 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 841 MODULE_LICENSE("GPL");
 842 module_init(init_nfsd)
 843 module_exit(exit_nfsd)