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         .owner          = THIS_MODULE,
 173 };
 174
 175 /*----------------------------------------------------------------------------*/
 176 /*
 177  * payload - write methods
 178  * If the method has a response, the response should be put in buf,
 179  * and the length returned.  Otherwise return 0 or and -error.
 180  */
 181
 182 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 183 {
 184         struct nfsctl_svc *data;
 185         if (size < sizeof(*data))
 186                 return -EINVAL;
 187         data = (struct nfsctl_svc*) buf;
 188         return nfsd_svc(data->svc_port, data->svc_nthreads);
 189 }
 190
 191 static ssize_t write_add(struct file *file, char *buf, size_t size)
 192 {
 193         struct nfsctl_client *data;
 194         if (size < sizeof(*data))
 195                 return -EINVAL;
 196         data = (struct nfsctl_client *)buf;
 197         return exp_addclient(data);
 198 }
 199
 200 static ssize_t write_del(struct file *file, char *buf, size_t size)
 201 {
 202         struct nfsctl_client *data;
 203         if (size < sizeof(*data))
 204                 return -EINVAL;
 205         data = (struct nfsctl_client *)buf;
 206         return exp_delclient(data);
 207 }
 208
 209 static ssize_t write_export(struct file *file, char *buf, size_t size)
 210 {
 211         struct nfsctl_export *data;
 212         if (size < sizeof(*data))
 213                 return -EINVAL;
 214         data = (struct nfsctl_export*)buf;
 215         return exp_export(data);
 216 }
 217
 218 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 219 {
 220         struct nfsctl_export *data;
 221
 222         if (size < sizeof(*data))
 223                 return -EINVAL;
 224         data = (struct nfsctl_export*)buf;
 225         return exp_unexport(data);
 226 }
 227
 228 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 229 {
 230         struct nfsctl_fsparm *data;
 231         struct sockaddr_in *sin;
 232         struct auth_domain *clp;
 233         int err = 0;
 234         struct knfsd_fh *res;
 235         struct in6_addr in6;
 236
 237         if (size < sizeof(*data))
 238                 return -EINVAL;
 239         data = (struct nfsctl_fsparm*)buf;
 240         err = -EPROTONOSUPPORT;
 241         if (data->gd_addr.sa_family != AF_INET)
 242                 goto out;
 243         sin = (struct sockaddr_in *)&data->gd_addr;
 244         if (data->gd_maxlen > NFS3_FHSIZE)
 245                 data->gd_maxlen = NFS3_FHSIZE;
 246
 247         res = (struct knfsd_fh*)buf;
 248
 249         exp_readlock();
 250
 251         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 252
 253         clp = auth_unix_lookup(&in6);
 254         if (!clp)
 255                 err = -EPERM;
 256         else {
 257                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 258                 auth_domain_put(clp);
 259         }
 260         exp_readunlock();
 261         if (err == 0)
 262                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 263  out:
 264         return err;
 265 }
 266
 267 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 268 {
 269         struct nfsctl_fdparm *data;
 270         struct sockaddr_in *sin;
 271         struct auth_domain *clp;
 272         int err = 0;
 273         struct knfsd_fh fh;
 274         char *res;
 275         struct in6_addr in6;
 276
 277         if (size < sizeof(*data))
 278                 return -EINVAL;
 279         data = (struct nfsctl_fdparm*)buf;
 280         err = -EPROTONOSUPPORT;
 281         if (data->gd_addr.sa_family != AF_INET)
 282                 goto out;
 283         err = -EINVAL;
 284         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 285                 goto out;
 286
 287         res = buf;
 288         sin = (struct sockaddr_in *)&data->gd_addr;
 289         exp_readlock();
 290
 291         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 292
 293         clp = auth_unix_lookup(&in6);
 294         if (!clp)
 295                 err = -EPERM;
 296         else {
 297                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 298                 auth_domain_put(clp);
 299         }
 300         exp_readunlock();
 301
 302         if (err == 0) {
 303                 memset(res,0, NFS_FHSIZE);
 304                 memcpy(res, &fh.fh_base, fh.fh_size);
 305                 err = NFS_FHSIZE;
 306         }
 307  out:
 308         return err;
 309 }
 310
 311 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
 312 {
 313         __be32 server_ip;
 314         char *fo_path, c;
 315         int b1, b2, b3, b4;
 316
 317         /* sanity check */
 318         if (size == 0)
 319                 return -EINVAL;
 320
 321         if (buf[size-1] != '\n')
 322                 return -EINVAL;
 323
 324         fo_path = buf;
 325         if (qword_get(&buf, fo_path, size) < 0)
 326                 return -EINVAL;
 327
 328         /* get ipv4 address */
 329         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 330                 return -EINVAL;
 331         server_ip = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
 332
 333         return nlmsvc_unlock_all_by_ip(server_ip);
 334 }
 335
 336 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
 337 {
 338         struct nameidata nd;
 339         char *fo_path;
 340         int error;
 341
 342         /* sanity check */
 343         if (size == 0)
 344                 return -EINVAL;
 345
 346         if (buf[size-1] != '\n')
 347                 return -EINVAL;
 348
 349         fo_path = buf;
 350         if (qword_get(&buf, fo_path, size) < 0)
 351                 return -EINVAL;
 352
 353         error = path_lookup(fo_path, 0, &nd);
 354         if (error)
 355                 return error;
 356
 357         error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb);
 358
 359         path_put(&nd.path);
 360         return error;
 361 }
 362
 363 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 364 {
 365         /* request is:
 366          *   domain path maxsize
 367          * response is
 368          *   filehandle
 369          *
 370          * qword quoting is used, so filehandle will be \x....
 371          */
 372         char *dname, *path;
 373         int uninitialized_var(maxsize);
 374         char *mesg = buf;
 375         int len;
 376         struct auth_domain *dom;
 377         struct knfsd_fh fh;
 378
 379         if (size == 0)
 380                 return -EINVAL;
 381
 382         if (buf[size-1] != '\n')
 383                 return -EINVAL;
 384         buf[size-1] = 0;
 385
 386         dname = mesg;
 387         len = qword_get(&mesg, dname, size);
 388         if (len <= 0) return -EINVAL;
 389
 390         path = dname+len+1;
 391         len = qword_get(&mesg, path, size);
 392         if (len <= 0) return -EINVAL;
 393
 394         len = get_int(&mesg, &maxsize);
 395         if (len)
 396                 return len;
 397
 398         if (maxsize < NFS_FHSIZE)
 399                 return -EINVAL;
 400         if (maxsize > NFS3_FHSIZE)
 401                 maxsize = NFS3_FHSIZE;
 402
 403         if (qword_get(&mesg, mesg, size)>0)
 404                 return -EINVAL;
 405
 406         /* we have all the words, they are in buf.. */
 407         dom = unix_domain_find(dname);
 408         if (!dom)
 409                 return -ENOMEM;
 410
 411         len = exp_rootfh(dom, path, &fh,  maxsize);
 412         auth_domain_put(dom);
 413         if (len)
 414                 return len;
 415
 416         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 417         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 418         mesg[-1] = '\n';
 419         return mesg - buf;
 420 }
 421
 422 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 423 {
 424         /* if size > 0, look for a number of threads and call nfsd_svc
 425          * then write out number of threads as reply
 426          */
 427         char *mesg = buf;
 428         int rv;
 429         if (size > 0) {
 430                 int newthreads;
 431                 rv = get_int(&mesg, &newthreads);
 432                 if (rv)
 433                         return rv;
 434                 if (newthreads <0)
 435                         return -EINVAL;
 436                 rv = nfsd_svc(2049, newthreads);
 437                 if (rv)
 438                         return rv;
 439         }
 440         sprintf(buf, "%d\n", nfsd_nrthreads());
 441         return strlen(buf);
 442 }
 443
 444 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 445 {
 446         /* if size > 0, look for an array of number of threads per node
 447          * and apply them  then write out number of threads per node as reply
 448          */
 449         char *mesg = buf;
 450         int i;
 451         int rv;
 452         int len;
 453         int npools = nfsd_nrpools();
 454         int *nthreads;
 455
 456         if (npools == 0) {
 457                 /*
 458                  * NFS is shut down.  The admin can start it by
 459                  * writing to the threads file but NOT the pool_threads
 460                  * file, sorry.  Report zero threads.
 461                  */
 462                 strcpy(buf, "0\n");
 463                 return strlen(buf);
 464         }
 465
 466         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 467         if (nthreads == NULL)
 468                 return -ENOMEM;
 469
 470         if (size > 0) {
 471                 for (i = 0; i < npools; i++) {
 472                         rv = get_int(&mesg, &nthreads[i]);
 473                         if (rv == -ENOENT)
 474                                 break;          /* fewer numbers than pools */
 475                         if (rv)
 476                                 goto out_free;  /* syntax error */
 477                         rv = -EINVAL;
 478                         if (nthreads[i] < 0)
 479                                 goto out_free;
 480                 }
 481                 rv = nfsd_set_nrthreads(i, nthreads);
 482                 if (rv)
 483                         goto out_free;
 484         }
 485
 486         rv = nfsd_get_nrthreads(npools, nthreads);
 487         if (rv)
 488                 goto out_free;
 489
 490         mesg = buf;
 491         size = SIMPLE_TRANSACTION_LIMIT;
 492         for (i = 0; i < npools && size > 0; i++) {
 493                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 494                 len = strlen(mesg);
 495                 size -= len;
 496                 mesg += len;
 497         }
 498
 499         return (mesg-buf);
 500
 501 out_free:
 502         kfree(nthreads);
 503         return rv;
 504 }
 505
 506 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 507 {
 508         /*
 509          * Format:
 510          *   [-/+]vers [-/+]vers ...
 511          */
 512         char *mesg = buf;
 513         char *vers, sign;
 514         int len, num;
 515         ssize_t tlen = 0;
 516         char *sep;
 517
 518         if (size>0) {
 519                 if (nfsd_serv)
 520                         /* Cannot change versions without updating
 521                          * nfsd_serv->sv_xdrsize, and reallocing
 522                          * rq_argp and rq_resp
 523                          */
 524                         return -EBUSY;
 525                 if (buf[size-1] != '\n')
 526                         return -EINVAL;
 527                 buf[size-1] = 0;
 528
 529                 vers = mesg;
 530                 len = qword_get(&mesg, vers, size);
 531                 if (len <= 0) return -EINVAL;
 532                 do {
 533                         sign = *vers;
 534                         if (sign == '+' || sign == '-')
 535                                 num = simple_strtol((vers+1), NULL, 0);
 536                         else
 537                                 num = simple_strtol(vers, NULL, 0);
 538                         switch(num) {
 539                         case 2:
 540                         case 3:
 541                         case 4:
 542                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 543                                 break;
 544                         default:
 545                                 return -EINVAL;
 546                         }
 547                         vers += len + 1;
 548                         tlen += len;
 549                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 550                 /* If all get turned off, turn them back on, as
 551                  * having no versions is BAD
 552                  */
 553                 nfsd_reset_versions();
 554         }
 555         /* Now write current state into reply buffer */
 556         len = 0;
 557         sep = "";
 558         for (num=2 ; num <= 4 ; num++)
 559                 if (nfsd_vers(num, NFSD_AVAIL)) {
 560                         len += sprintf(buf+len, "%s%c%d", sep,
 561                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 562                                        num);
 563                         sep = " ";
 564                 }
 565         len += sprintf(buf+len, "\n");
 566         return len;
 567 }
 568
 569 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 570 {
 571         if (size == 0) {
 572                 int len = 0;
 573                 lock_kernel();
 574                 if (nfsd_serv)
 575                         len = svc_xprt_names(nfsd_serv, buf, 0);
 576                 unlock_kernel();
 577                 return len;
 578         }
 579         /* Either a single 'fd' number is written, in which
 580          * case it must be for a socket of a supported family/protocol,
 581          * and we use it as an nfsd socket, or
 582          * A '-' followed by the 'name' of a socket in which case
 583          * we close the socket.
 584          */
 585         if (isdigit(buf[0])) {
 586                 char *mesg = buf;
 587                 int fd;
 588                 int err;
 589                 err = get_int(&mesg, &fd);
 590                 if (err)
 591                         return -EINVAL;
 592                 if (fd < 0)
 593                         return -EINVAL;
 594                 err = nfsd_create_serv();
 595                 if (!err) {
 596                         int proto = 0;
 597                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
 598                         if (err >= 0) {
 599                                 err = lockd_up(proto);
 600                                 if (err < 0)
 601                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 602                         }
 603                         /* Decrease the count, but don't shutdown the
 604                          * the service
 605                          */
 606                         lock_kernel();
 607                         nfsd_serv->sv_nrthreads--;
 608                         unlock_kernel();
 609                 }
 610                 return err < 0 ? err : 0;
 611         }
 612         if (buf[0] == '-' && isdigit(buf[1])) {
 613                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 614                 int len = 0;
 615                 if (!toclose)
 616                         return -ENOMEM;
 617                 lock_kernel();
 618                 if (nfsd_serv)
 619                         len = svc_sock_names(buf, nfsd_serv, toclose);
 620                 unlock_kernel();
 621                 if (len >= 0)
 622                         lockd_down();
 623                 kfree(toclose);
 624                 return len;
 625         }
 626         /*
 627          * Add a transport listener by writing it's transport name
 628          */
 629         if (isalpha(buf[0])) {
 630                 int err;
 631                 char transport[16];
 632                 int port;
 633                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 634                         err = nfsd_create_serv();
 635                         if (!err) {
 636                                 err = svc_create_xprt(nfsd_serv,
 637                                                       transport, port,
 638                                                       SVC_SOCK_ANONYMOUS);
 639                                 if (err == -ENOENT)
 640                                         /* Give a reasonable perror msg for
 641                                          * bad transport string */
 642                                         err = -EPROTONOSUPPORT;
 643                         }
 644                         return err < 0 ? err : 0;
 645                 }
 646         }
 647         /*
 648          * Remove a transport by writing it's transport name and port number
 649          */
 650         if (buf[0] == '-' && isalpha(buf[1])) {
 651                 struct svc_xprt *xprt;
 652                 int err = -EINVAL;
 653                 char transport[16];
 654                 int port;
 655                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 656                         if (port == 0)
 657                                 return -EINVAL;
 658                         lock_kernel();
 659                         if (nfsd_serv) {
 660                                 xprt = svc_find_xprt(nfsd_serv, transport,
 661                                                      AF_UNSPEC, port);
 662                                 if (xprt) {
 663                                         svc_close_xprt(xprt);
 664                                         svc_xprt_put(xprt);
 665                                         err = 0;
 666                                 } else
 667                                         err = -ENOTCONN;
 668                         }
 669                         unlock_kernel();
 670                         return err < 0 ? err : 0;
 671                 }
 672         }
 673         return -EINVAL;
 674 }
 675
 676 int nfsd_max_blksize;
 677
 678 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 679 {
 680         char *mesg = buf;
 681         if (size > 0) {
 682                 int bsize;
 683                 int rv = get_int(&mesg, &bsize);
 684                 if (rv)
 685                         return rv;
 686                 /* force bsize into allowed range and
 687                  * required alignment.
 688                  */
 689                 if (bsize < 1024)
 690                         bsize = 1024;
 691                 if (bsize > NFSSVC_MAXBLKSIZE)
 692                         bsize = NFSSVC_MAXBLKSIZE;
 693                 bsize &= ~(1024-1);
 694                 lock_kernel();
 695                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 696                         unlock_kernel();
 697                         return -EBUSY;
 698                 }
 699                 nfsd_max_blksize = bsize;
 700                 unlock_kernel();
 701         }
 702         return sprintf(buf, "%d\n", nfsd_max_blksize);
 703 }
 704
 705 #ifdef CONFIG_NFSD_V4
 706 extern time_t nfs4_leasetime(void);
 707
 708 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 709 {
 710         /* if size > 10 seconds, call
 711          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 712          */
 713         char *mesg = buf;
 714         int rv;
 715
 716         if (size > 0) {
 717                 int lease;
 718                 rv = get_int(&mesg, &lease);
 719                 if (rv)
 720                         return rv;
 721                 if (lease < 10 || lease > 3600)
 722                         return -EINVAL;
 723                 nfs4_reset_lease(lease);
 724         }
 725         sprintf(buf, "%ld\n", nfs4_lease_time());
 726         return strlen(buf);
 727 }
 728
 729 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 730 {
 731         char *mesg = buf;
 732         char *recdir;
 733         int len, status;
 734
 735         if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
 736                 return -EINVAL;
 737         buf[size-1] = 0;
 738
 739         recdir = mesg;
 740         len = qword_get(&mesg, recdir, size);
 741         if (len <= 0)
 742                 return -EINVAL;
 743
 744         status = nfs4_reset_recoverydir(recdir);
 745         return strlen(buf);
 746 }
 747 #endif
 748
 749 /*----------------------------------------------------------------------------*/
 750 /*
 751  *      populating the filesystem.
 752  */
 753
 754 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 755 {
 756         static struct tree_descr nfsd_files[] = {
 757                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 758                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 759                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 760                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 761                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 762                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 763                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 764                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 765                 [NFSD_FO_UnlockIP] = {"unlock_ip",
 766                                         &transaction_ops, S_IWUSR|S_IRUSR},
 767                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
 768                                         &transaction_ops, S_IWUSR|S_IRUSR},
 769                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 770                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 771                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 772                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 773                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 774                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 775 #ifdef CONFIG_NFSD_V4
 776                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 777                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 778 #endif
 779                 /* last one */ {""}
 780         };
 781         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 782 }
 783
 784 static int nfsd_get_sb(struct file_system_type *fs_type,
 785         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 786 {
 787         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 788 }
 789
 790 static struct file_system_type nfsd_fs_type = {
 791         .owner          = THIS_MODULE,
 792         .name           = "nfsd",
 793         .get_sb         = nfsd_get_sb,
 794         .kill_sb        = kill_litter_super,
 795 };
 796
 797 #ifdef CONFIG_PROC_FS
 798 static int create_proc_exports_entry(void)
 799 {
 800         struct proc_dir_entry *entry;
 801
 802         entry = proc_mkdir("fs/nfs", NULL);
 803         if (!entry)
 804                 return -ENOMEM;
 805         entry = proc_create("exports", 0, entry, &exports_operations);
 806         if (!entry)
 807                 return -ENOMEM;
 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)