fs/nfsd/nfsctl.c

   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_FO_UnlockFS,
  60         NFSD_Threads,
  61         NFSD_Pool_Threads,
  62         NFSD_Versions,
  63         NFSD_Ports,
  64         NFSD_MaxBlkSize,
  65         /*
  66          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  67          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  68          */
  69 #ifdef CONFIG_NFSD_V4
  70         NFSD_Leasetime,
  71         NFSD_RecoveryDir,
  72 #endif
  73 };
  74
  75 /*
  76  * write() for these nodes.
  77  */
  78 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  79 static ssize_t write_add(struct file *file, char *buf, size_t size);
  80 static ssize_t write_del(struct file *file, char *buf, size_t size);
  81 static ssize_t write_export(struct file *file, char *buf, size_t size);
  82 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  83 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  84 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  85 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  86 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  87 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  88 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  89 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  90 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  91 #ifdef CONFIG_NFSD_V4
  92 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  93 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  94 #endif
  95
  96 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
  97 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size);
  98
  99 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 100         [NFSD_Svc] = write_svc,
 101         [NFSD_Add] = write_add,
 102         [NFSD_Del] = write_del,
 103         [NFSD_Export] = write_export,
 104         [NFSD_Unexport] = write_unexport,
 105         [NFSD_Getfd] = write_getfd,
 106         [NFSD_Getfs] = write_getfs,
 107         [NFSD_Fh] = write_filehandle,
 108         [NFSD_FO_UnlockIP] = failover_unlock_ip,
 109         [NFSD_FO_UnlockFS] = failover_unlock_fs,
 110         [NFSD_Threads] = write_threads,
 111         [NFSD_Pool_Threads] = write_pool_threads,
 112         [NFSD_Versions] = write_versions,
 113         [NFSD_Ports] = write_ports,
 114         [NFSD_MaxBlkSize] = write_maxblksize,
 115 #ifdef CONFIG_NFSD_V4
 116         [NFSD_Leasetime] = write_leasetime,
 117         [NFSD_RecoveryDir] = write_recoverydir,
 118 #endif
 119 };
 120
 121 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 122 {
 123         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 124         char *data;
 125         ssize_t rv;
 126
 127         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 128                 return -EINVAL;
 129
 130         data = simple_transaction_get(file, buf, size);
 131         if (IS_ERR(data))
 132                 return PTR_ERR(data);
 133
 134         rv =  write_op[ino](file, data, size);
 135         if (rv >= 0) {
 136                 simple_transaction_set(file, rv);
 137                 rv = size;
 138         }
 139         return rv;
 140 }
 141
 142 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 143 {
 144         if (! file->private_data) {
 145                 /* An attempt to read a transaction file without writing
 146                  * causes a 0-byte write so that the file can return
 147                  * state information
 148                  */
 149                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 150                 if (rv < 0)
 151                         return rv;
 152         }
 153         return simple_transaction_read(file, buf, size, pos);
 154 }
 155
 156 static const struct file_operations transaction_ops = {
 157         .write          = nfsctl_transaction_write,
 158         .read           = nfsctl_transaction_read,
 159         .release        = simple_transaction_release,
 160 };
 161
 162 static int exports_open(struct inode *inode, struct file *file)
 163 {
 164         return seq_open(file, &nfs_exports_op);
 165 }
 166
 167 static const struct file_operations exports_operations = {
 168         .open           = exports_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = seq_release,
 172 };
 173
 174 /*----------------------------------------------------------------------------*/
 175 /*
 176  * payload - write methods
 177  * If the method has a response, the response should be put in buf,
 178  * and the length returned.  Otherwise return 0 or and -error.
 179  */
 180
 181 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 182 {
 183         struct nfsctl_svc *data;
 184         if (size < sizeof(*data))
 185                 return -EINVAL;
 186         data = (struct nfsctl_svc*) buf;
 187         return nfsd_svc(data->svc_port, data->svc_nthreads);
 188 }
 189
 190 static ssize_t write_add(struct file *file, char *buf, size_t size)
 191 {
 192         struct nfsctl_client *data;
 193         if (size < sizeof(*data))
 194                 return -EINVAL;
 195         data = (struct nfsctl_client *)buf;
 196         return exp_addclient(data);
 197 }
 198
 199 static ssize_t write_del(struct file *file, char *buf, size_t size)
 200 {
 201         struct nfsctl_client *data;
 202         if (size < sizeof(*data))
 203                 return -EINVAL;
 204         data = (struct nfsctl_client *)buf;
 205         return exp_delclient(data);
 206 }
 207
 208 static ssize_t write_export(struct file *file, char *buf, size_t size)
 209 {
 210         struct nfsctl_export *data;
 211         if (size < sizeof(*data))
 212                 return -EINVAL;
 213         data = (struct nfsctl_export*)buf;
 214         return exp_export(data);
 215 }
 216
 217 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 218 {
 219         struct nfsctl_export *data;
 220
 221         if (size < sizeof(*data))
 222                 return -EINVAL;
 223         data = (struct nfsctl_export*)buf;
 224         return exp_unexport(data);
 225 }
 226
 227 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 228 {
 229         struct nfsctl_fsparm *data;
 230         struct sockaddr_in *sin;
 231         struct auth_domain *clp;
 232         int err = 0;
 233         struct knfsd_fh *res;
 234         struct in6_addr in6;
 235
 236         if (size < sizeof(*data))
 237                 return -EINVAL;
 238         data = (struct nfsctl_fsparm*)buf;
 239         err = -EPROTONOSUPPORT;
 240         if (data->gd_addr.sa_family != AF_INET)
 241                 goto out;
 242         sin = (struct sockaddr_in *)&data->gd_addr;
 243         if (data->gd_maxlen > NFS3_FHSIZE)
 244                 data->gd_maxlen = NFS3_FHSIZE;
 245
 246         res = (struct knfsd_fh*)buf;
 247
 248         exp_readlock();
 249
 250         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 251
 252         clp = auth_unix_lookup(&in6);
 253         if (!clp)
 254                 err = -EPERM;
 255         else {
 256                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 257                 auth_domain_put(clp);
 258         }
 259         exp_readunlock();
 260         if (err == 0)
 261                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 262  out:
 263         return err;
 264 }
 265
 266 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 267 {
 268         struct nfsctl_fdparm *data;
 269         struct sockaddr_in *sin;
 270         struct auth_domain *clp;
 271         int err = 0;
 272         struct knfsd_fh fh;
 273         char *res;
 274         struct in6_addr in6;
 275
 276         if (size < sizeof(*data))
 277                 return -EINVAL;
 278         data = (struct nfsctl_fdparm*)buf;
 279         err = -EPROTONOSUPPORT;
 280         if (data->gd_addr.sa_family != AF_INET)
 281                 goto out;
 282         err = -EINVAL;
 283         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 284                 goto out;
 285
 286         res = buf;
 287         sin = (struct sockaddr_in *)&data->gd_addr;
 288         exp_readlock();
 289
 290         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 291
 292         clp = auth_unix_lookup(&in6);
 293         if (!clp)
 294                 err = -EPERM;
 295         else {
 296                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 297                 auth_domain_put(clp);
 298         }
 299         exp_readunlock();
 300
 301         if (err == 0) {
 302                 memset(res,0, NFS_FHSIZE);
 303                 memcpy(res, &fh.fh_base, fh.fh_size);
 304                 err = NFS_FHSIZE;
 305         }
 306  out:
 307         return err;
 308 }
 309
 310 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
 311 {
 312         __be32 server_ip;
 313         char *fo_path, c;
 314         int b1, b2, b3, b4;
 315
 316         /* sanity check */
 317         if (size == 0)
 318                 return -EINVAL;
 319
 320         if (buf[size-1] != '\n')
 321                 return -EINVAL;
 322
 323         fo_path = buf;
 324         if (qword_get(&buf, fo_path, size) < 0)
 325                 return -EINVAL;
 326
 327         /* get ipv4 address */
 328         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 329                 return -EINVAL;
 330         server_ip = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
 331
 332         return nlmsvc_unlock_all_by_ip(server_ip);
 333 }
 334
 335 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
 336 {
 337         struct nameidata nd;
 338         char *fo_path;
 339         int error;
 340
 341         /* sanity check */
 342         if (size == 0)
 343                 return -EINVAL;
 344
 345         if (buf[size-1] != '\n')
 346                 return -EINVAL;
 347
 348         fo_path = buf;
 349         if (qword_get(&buf, fo_path, size) < 0)
 350                 return -EINVAL;
 351
 352         error = path_lookup(fo_path, 0, &nd);
 353         if (error)
 354                 return error;
 355
 356         error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb);
 357
 358         path_put(&nd.path);
 359         return error;
 360 }
 361
 362 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 363 {
 364         /* request is:
 365          *   domain path maxsize
 366          * response is
 367          *   filehandle
 368          *
 369          * qword quoting is used, so filehandle will be \x....
 370          */
 371         char *dname, *path;
 372         int uninitialized_var(maxsize);
 373         char *mesg = buf;
 374         int len;
 375         struct auth_domain *dom;
 376         struct knfsd_fh fh;
 377
 378         if (size == 0)
 379                 return -EINVAL;
 380
 381         if (buf[size-1] != '\n')
 382                 return -EINVAL;
 383         buf[size-1] = 0;
 384
 385         dname = mesg;
 386         len = qword_get(&mesg, dname, size);
 387         if (len <= 0) return -EINVAL;
 388
 389         path = dname+len+1;
 390         len = qword_get(&mesg, path, size);
 391         if (len <= 0) return -EINVAL;
 392
 393         len = get_int(&mesg, &maxsize);
 394         if (len)
 395                 return len;
 396
 397         if (maxsize < NFS_FHSIZE)
 398                 return -EINVAL;
 399         if (maxsize > NFS3_FHSIZE)
 400                 maxsize = NFS3_FHSIZE;
 401
 402         if (qword_get(&mesg, mesg, size)>0)
 403                 return -EINVAL;
 404
 405         /* we have all the words, they are in buf.. */
 406         dom = unix_domain_find(dname);
 407         if (!dom)
 408                 return -ENOMEM;
 409
 410         len = exp_rootfh(dom, path, &fh,  maxsize);
 411         auth_domain_put(dom);
 412         if (len)
 413                 return len;
 414
 415         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 416         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 417         mesg[-1] = '\n';
 418         return mesg - buf;
 419 }
 420
 421 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 422 {
 423         /* if size > 0, look for a number of threads and call nfsd_svc
 424          * then write out number of threads as reply
 425          */
 426         char *mesg = buf;
 427         int rv;
 428         if (size > 0) {
 429                 int newthreads;
 430                 rv = get_int(&mesg, &newthreads);
 431                 if (rv)
 432                         return rv;
 433                 if (newthreads <0)
 434                         return -EINVAL;
 435                 rv = nfsd_svc(2049, newthreads);
 436                 if (rv)
 437                         return rv;
 438         }
 439         sprintf(buf, "%d\n", nfsd_nrthreads());
 440         return strlen(buf);
 441 }
 442
 443 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 444 {
 445         /* if size > 0, look for an array of number of threads per node
 446          * and apply them  then write out number of threads per node as reply
 447          */
 448         char *mesg = buf;
 449         int i;
 450         int rv;
 451         int len;
 452         int npools = nfsd_nrpools();
 453         int *nthreads;
 454
 455         if (npools == 0) {
 456                 /*
 457                  * NFS is shut down.  The admin can start it by
 458                  * writing to the threads file but NOT the pool_threads
 459                  * file, sorry.  Report zero threads.
 460                  */
 461                 strcpy(buf, "0\n");
 462                 return strlen(buf);
 463         }
 464
 465         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 466         if (nthreads == NULL)
 467                 return -ENOMEM;
 468
 469         if (size > 0) {
 470                 for (i = 0; i < npools; i++) {
 471                         rv = get_int(&mesg, &nthreads[i]);
 472                         if (rv == -ENOENT)
 473                                 break;          /* fewer numbers than pools */
 474                         if (rv)
 475                                 goto out_free;  /* syntax error */
 476                         rv = -EINVAL;
 477                         if (nthreads[i] < 0)
 478                                 goto out_free;
 479                 }
 480                 rv = nfsd_set_nrthreads(i, nthreads);
 481                 if (rv)
 482                         goto out_free;
 483         }
 484
 485         rv = nfsd_get_nrthreads(npools, nthreads);
 486         if (rv)
 487                 goto out_free;
 488
 489         mesg = buf;
 490         size = SIMPLE_TRANSACTION_LIMIT;
 491         for (i = 0; i < npools && size > 0; i++) {
 492                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 493                 len = strlen(mesg);
 494                 size -= len;
 495                 mesg += len;
 496         }
 497
 498         return (mesg-buf);
 499
 500 out_free:
 501         kfree(nthreads);
 502         return rv;
 503 }
 504
 505 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 506 {
 507         /*
 508          * Format:
 509          *   [-/+]vers [-/+]vers ...
 510          */
 511         char *mesg = buf;
 512         char *vers, sign;
 513         int len, num;
 514         ssize_t tlen = 0;
 515         char *sep;
 516
 517         if (size>0) {
 518                 if (nfsd_serv)
 519                         /* Cannot change versions without updating
 520                          * nfsd_serv->sv_xdrsize, and reallocing
 521                          * rq_argp and rq_resp
 522                          */
 523                         return -EBUSY;
 524                 if (buf[size-1] != '\n')
 525                         return -EINVAL;
 526                 buf[size-1] = 0;
 527
 528                 vers = mesg;
 529                 len = qword_get(&mesg, vers, size);
 530                 if (len <= 0) return -EINVAL;
 531                 do {
 532                         sign = *vers;
 533                         if (sign == '+' || sign == '-')
 534                                 num = simple_strtol((vers+1), NULL, 0);
 535                         else
 536                                 num = simple_strtol(vers, NULL, 0);
 537                         switch(num) {
 538                         case 2:
 539                         case 3:
 540                         case 4:
 541                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 542                                 break;
 543                         default:
 544                                 return -EINVAL;
 545                         }
 546                         vers += len + 1;
 547                         tlen += len;
 548                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 549                 /* If all get turned off, turn them back on, as
 550                  * having no versions is BAD
 551                  */
 552                 nfsd_reset_versions();
 553         }
 554         /* Now write current state into reply buffer */
 555         len = 0;
 556         sep = "";
 557         for (num=2 ; num <= 4 ; num++)
 558                 if (nfsd_vers(num, NFSD_AVAIL)) {
 559                         len += sprintf(buf+len, "%s%c%d", sep,
 560                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 561                                        num);
 562                         sep = " ";
 563                 }
 564         len += sprintf(buf+len, "\n");
 565         return len;
 566 }
 567
 568 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 569 {
 570         if (size == 0) {
 571                 int len = 0;
 572                 lock_kernel();
 573                 if (nfsd_serv)
 574                         len = svc_xprt_names(nfsd_serv, buf, 0);
 575                 unlock_kernel();
 576                 return len;
 577         }
 578         /* Either a single 'fd' number is written, in which
 579          * case it must be for a socket of a supported family/protocol,
 580          * and we use it as an nfsd socket, or
 581          * A '-' followed by the 'name' of a socket in which case
 582          * we close the socket.
 583          */
 584         if (isdigit(buf[0])) {
 585                 char *mesg = buf;
 586                 int fd;
 587                 int err;
 588                 err = get_int(&mesg, &fd);
 589                 if (err)
 590                         return -EINVAL;
 591                 if (fd < 0)
 592                         return -EINVAL;
 593                 err = nfsd_create_serv();
 594                 if (!err) {
 595                         int proto = 0;
 596                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
 597                         if (err >= 0) {
 598                                 err = lockd_up(proto);
 599                                 if (err < 0)
 600                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 601                         }
 602                         /* Decrease the count, but don't shutdown the
 603                          * the service
 604                          */
 605                         lock_kernel();
 606                         nfsd_serv->sv_nrthreads--;
 607                         unlock_kernel();
 608                 }
 609                 return err < 0 ? err : 0;
 610         }
 611         if (buf[0] == '-' && isdigit(buf[1])) {
 612                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 613                 int len = 0;
 614                 if (!toclose)
 615                         return -ENOMEM;
 616                 lock_kernel();
 617                 if (nfsd_serv)
 618                         len = svc_sock_names(buf, nfsd_serv, toclose);
 619                 unlock_kernel();
 620                 if (len >= 0)
 621                         lockd_down();
 622                 kfree(toclose);
 623                 return len;
 624         }
 625         /*
 626          * Add a transport listener by writing it's transport name
 627          */
 628         if (isalpha(buf[0])) {
 629                 int err;
 630                 char transport[16];
 631                 int port;
 632                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 633                         err = nfsd_create_serv();
 634                         if (!err) {
 635                                 err = svc_create_xprt(nfsd_serv,
 636                                                       transport, port,
 637                                                       SVC_SOCK_ANONYMOUS);
 638                                 if (err == -ENOENT)
 639                                         /* Give a reasonable perror msg for
 640                                          * bad transport string */
 641                                         err = -EPROTONOSUPPORT;
 642                         }
 643                         return err < 0 ? err : 0;
 644                 }
 645         }
 646         /*
 647          * Remove a transport by writing it's transport name and port number
 648          */
 649         if (buf[0] == '-' && isalpha(buf[1])) {
 650                 struct svc_xprt *xprt;
 651                 int err = -EINVAL;
 652                 char transport[16];
 653                 int port;
 654                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 655                         if (port == 0)
 656                                 return -EINVAL;
 657                         lock_kernel();
 658                         if (nfsd_serv) {
 659                                 xprt = svc_find_xprt(nfsd_serv, transport,
 660                                                      AF_UNSPEC, port);
 661                                 if (xprt) {
 662                                         svc_close_xprt(xprt);
 663                                         svc_xprt_put(xprt);
 664                                         err = 0;
 665                                 } else
 666                                         err = -ENOTCONN;
 667                         }
 668                         unlock_kernel();
 669                         return err < 0 ? err : 0;
 670                 }
 671         }
 672         return -EINVAL;
 673 }
 674
 675 int nfsd_max_blksize;
 676
 677 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 678 {
 679         char *mesg = buf;
 680         if (size > 0) {
 681                 int bsize;
 682                 int rv = get_int(&mesg, &bsize);
 683                 if (rv)
 684                         return rv;
 685                 /* force bsize into allowed range and
 686                  * required alignment.
 687                  */
 688                 if (bsize < 1024)
 689                         bsize = 1024;
 690                 if (bsize > NFSSVC_MAXBLKSIZE)
 691                         bsize = NFSSVC_MAXBLKSIZE;
 692                 bsize &= ~(1024-1);
 693                 lock_kernel();
 694                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 695                         unlock_kernel();
 696                         return -EBUSY;
 697                 }
 698                 nfsd_max_blksize = bsize;
 699                 unlock_kernel();
 700         }
 701         return sprintf(buf, "%d\n", nfsd_max_blksize);
 702 }
 703
 704 #ifdef CONFIG_NFSD_V4
 705 extern time_t nfs4_leasetime(void);
 706
 707 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 708 {
 709         /* if size > 10 seconds, call
 710          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 711          */
 712         char *mesg = buf;
 713         int rv;
 714
 715         if (size > 0) {
 716                 int lease;
 717                 rv = get_int(&mesg, &lease);
 718                 if (rv)
 719                         return rv;
 720                 if (lease < 10 || lease > 3600)
 721                         return -EINVAL;
 722                 nfs4_reset_lease(lease);
 723         }
 724         sprintf(buf, "%ld\n", nfs4_lease_time());
 725         return strlen(buf);
 726 }
 727
 728 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 729 {
 730         char *mesg = buf;
 731         char *recdir;
 732         int len, status;
 733
 734         if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
 735                 return -EINVAL;
 736         buf[size-1] = 0;
 737
 738         recdir = mesg;
 739         len = qword_get(&mesg, recdir, size);
 740         if (len <= 0)
 741                 return -EINVAL;
 742
 743         status = nfs4_reset_recoverydir(recdir);
 744         return strlen(buf);
 745 }
 746 #endif
 747
 748 /*----------------------------------------------------------------------------*/
 749 /*
 750  *      populating the filesystem.
 751  */
 752
 753 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 754 {
 755         static struct tree_descr nfsd_files[] = {
 756                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 757                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 758                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 759                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 760                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 761                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 762                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 763                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 764                 [NFSD_FO_UnlockIP] = {"unlock_ip",
 765                                         &transaction_ops, S_IWUSR|S_IRUSR},
 766                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
 767                                         &transaction_ops, S_IWUSR|S_IRUSR},
 768                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 769                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 770                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 771                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 772                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 773                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 774 #ifdef CONFIG_NFSD_V4
 775                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 776                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 777 #endif
 778                 /* last one */ {""}
 779         };
 780         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 781 }
 782
 783 static int nfsd_get_sb(struct file_system_type *fs_type,
 784         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 785 {
 786         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 787 }
 788
 789 static struct file_system_type nfsd_fs_type = {
 790         .owner          = THIS_MODULE,
 791         .name           = "nfsd",
 792         .get_sb         = nfsd_get_sb,
 793         .kill_sb        = kill_litter_super,
 794 };
 795
 796 #ifdef CONFIG_PROC_FS
 797 static int create_proc_exports_entry(void)
 798 {
 799         struct proc_dir_entry *entry;
 800
 801         entry = proc_mkdir("fs/nfs", NULL);
 802         if (!entry)
 803                 return -ENOMEM;
 804         entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 805         if (!entry)
 806                 return -ENOMEM;
 807         entry->proc_fops =  &exports_operations;
 808         return 0;
 809 }
 810 #else /* CONFIG_PROC_FS */
 811 static int create_proc_exports_entry(void)
 812 {
 813         return 0;
 814 }
 815 #endif
 816
 817 static int __init init_nfsd(void)
 818 {
 819         int retval;
 820         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 821
 822         retval = nfs4_state_init(); /* nfs4 locking state */
 823         if (retval)
 824                 return retval;
 825         nfsd_stat_init();       /* Statistics */
 826         retval = nfsd_reply_cache_init();
 827         if (retval)
 828                 goto out_free_stat;
 829         retval = nfsd_export_init();
 830         if (retval)
 831                 goto out_free_cache;
 832         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 833         retval = nfsd_idmap_init();
 834         if (retval)
 835                 goto out_free_lockd;
 836         retval = create_proc_exports_entry();
 837         if (retval)
 838                 goto out_free_idmap;
 839         retval = register_filesystem(&nfsd_fs_type);
 840         if (retval)
 841                 goto out_free_all;
 842         return 0;
 843 out_free_all:
 844         remove_proc_entry("fs/nfs/exports", NULL);
 845         remove_proc_entry("fs/nfs", NULL);
 846 out_free_idmap:
 847         nfsd_idmap_shutdown();
 848 out_free_lockd:
 849         nfsd_lockd_shutdown();
 850         nfsd_export_shutdown();
 851 out_free_cache:
 852         nfsd_reply_cache_shutdown();
 853 out_free_stat:
 854         nfsd_stat_shutdown();
 855         nfsd4_free_slabs();
 856         return retval;
 857 }
 858
 859 static void __exit exit_nfsd(void)
 860 {
 861         nfsd_export_shutdown();
 862         nfsd_reply_cache_shutdown();
 863         remove_proc_entry("fs/nfs/exports", NULL);
 864         remove_proc_entry("fs/nfs", NULL);
 865         nfsd_stat_shutdown();
 866         nfsd_lockd_shutdown();
 867         nfsd_idmap_shutdown();
 868         nfsd4_free_slabs();
 869         unregister_filesystem(&nfsd_fs_type);
 870 }
 871
 872 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 873 MODULE_LICENSE("GPL");
 874 module_init(init_nfsd)
 875 module_exit(exit_nfsd)