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/namei.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/net.h>
  18 #include <linux/in.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/unistd.h>
  21 #include <linux/slab.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/init.h>
  26 #include <linux/inet.h>
  27 #include <linux/string.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/ctype.h>
  30
  31 #include <linux/nfs.h>
  32 #include <linux/nfsd_idmap.h>
  33 #include <linux/lockd/bind.h>
  34 #include <linux/sunrpc/svc.h>
  35 #include <linux/sunrpc/svcsock.h>
  36 #include <linux/nfsd/nfsd.h>
  37 #include <linux/nfsd/cache.h>
  38 #include <linux/nfsd/xdr.h>
  39 #include <linux/nfsd/syscall.h>
  40 #include <linux/lockd/lockd.h>
  41
  42 #include <asm/uaccess.h>
  43 #include <net/ipv6.h>
  44
  45 /*
  46  *      We have a single directory with 9 nodes in it.
  47  */
  48 enum {
  49         NFSD_Root = 1,
  50         NFSD_Svc,
  51         NFSD_Add,
  52         NFSD_Del,
  53         NFSD_Export,
  54         NFSD_Unexport,
  55         NFSD_Getfd,
  56         NFSD_Getfs,
  57         NFSD_List,
  58         NFSD_Fh,
  59         NFSD_FO_UnlockIP,
  60         NFSD_FO_UnlockFS,
  61         NFSD_Threads,
  62         NFSD_Pool_Threads,
  63         NFSD_Versions,
  64         NFSD_Ports,
  65         NFSD_MaxBlkSize,
  66         /*
  67          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  68          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  69          */
  70 #ifdef CONFIG_NFSD_V4
  71         NFSD_Leasetime,
  72         NFSD_RecoveryDir,
  73 #endif
  74 };
  75
  76 /*
  77  * write() for these nodes.
  78  */
  79 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  80 static ssize_t write_add(struct file *file, char *buf, size_t size);
  81 static ssize_t write_del(struct file *file, char *buf, size_t size);
  82 static ssize_t write_export(struct file *file, char *buf, size_t size);
  83 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  84 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  85 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  86 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  87 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  88 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  89 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  90 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  91 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  92 #ifdef CONFIG_NFSD_V4
  93 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  94 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  95 #endif
  96
  97 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
  98 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size);
  99
 100 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 101         [NFSD_Svc] = write_svc,
 102         [NFSD_Add] = write_add,
 103         [NFSD_Del] = write_del,
 104         [NFSD_Export] = write_export,
 105         [NFSD_Unexport] = write_unexport,
 106         [NFSD_Getfd] = write_getfd,
 107         [NFSD_Getfs] = write_getfs,
 108         [NFSD_Fh] = write_filehandle,
 109         [NFSD_FO_UnlockIP] = failover_unlock_ip,
 110         [NFSD_FO_UnlockFS] = failover_unlock_fs,
 111         [NFSD_Threads] = write_threads,
 112         [NFSD_Pool_Threads] = write_pool_threads,
 113         [NFSD_Versions] = write_versions,
 114         [NFSD_Ports] = write_ports,
 115         [NFSD_MaxBlkSize] = write_maxblksize,
 116 #ifdef CONFIG_NFSD_V4
 117         [NFSD_Leasetime] = write_leasetime,
 118         [NFSD_RecoveryDir] = write_recoverydir,
 119 #endif
 120 };
 121
 122 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 123 {
 124         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 125         char *data;
 126         ssize_t rv;
 127
 128         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 129                 return -EINVAL;
 130
 131         data = simple_transaction_get(file, buf, size);
 132         if (IS_ERR(data))
 133                 return PTR_ERR(data);
 134
 135         rv =  write_op[ino](file, data, size);
 136         if (rv >= 0) {
 137                 simple_transaction_set(file, rv);
 138                 rv = size;
 139         }
 140         return rv;
 141 }
 142
 143 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 144 {
 145         if (! file->private_data) {
 146                 /* An attempt to read a transaction file without writing
 147                  * causes a 0-byte write so that the file can return
 148                  * state information
 149                  */
 150                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 151                 if (rv < 0)
 152                         return rv;
 153         }
 154         return simple_transaction_read(file, buf, size, pos);
 155 }
 156
 157 static const struct file_operations transaction_ops = {
 158         .write          = nfsctl_transaction_write,
 159         .read           = nfsctl_transaction_read,
 160         .release        = simple_transaction_release,
 161 };
 162
 163 static int exports_open(struct inode *inode, struct file *file)
 164 {
 165         return seq_open(file, &nfs_exports_op);
 166 }
 167
 168 static const struct file_operations exports_operations = {
 169         .open           = exports_open,
 170         .read           = seq_read,
 171         .llseek         = seq_lseek,
 172         .release        = seq_release,
 173         .owner          = THIS_MODULE,
 174 };
 175
 176 /*----------------------------------------------------------------------------*/
 177 /*
 178  * payload - write methods
 179  * If the method has a response, the response should be put in buf,
 180  * and the length returned.  Otherwise return 0 or and -error.
 181  */
 182
 183 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 184 {
 185         struct nfsctl_svc *data;
 186         if (size < sizeof(*data))
 187                 return -EINVAL;
 188         data = (struct nfsctl_svc*) buf;
 189         return nfsd_svc(data->svc_port, data->svc_nthreads);
 190 }
 191
 192 static ssize_t write_add(struct file *file, char *buf, size_t size)
 193 {
 194         struct nfsctl_client *data;
 195         if (size < sizeof(*data))
 196                 return -EINVAL;
 197         data = (struct nfsctl_client *)buf;
 198         return exp_addclient(data);
 199 }
 200
 201 static ssize_t write_del(struct file *file, char *buf, size_t size)
 202 {
 203         struct nfsctl_client *data;
 204         if (size < sizeof(*data))
 205                 return -EINVAL;
 206         data = (struct nfsctl_client *)buf;
 207         return exp_delclient(data);
 208 }
 209
 210 static ssize_t write_export(struct file *file, char *buf, size_t size)
 211 {
 212         struct nfsctl_export *data;
 213         if (size < sizeof(*data))
 214                 return -EINVAL;
 215         data = (struct nfsctl_export*)buf;
 216         return exp_export(data);
 217 }
 218
 219 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 220 {
 221         struct nfsctl_export *data;
 222
 223         if (size < sizeof(*data))
 224                 return -EINVAL;
 225         data = (struct nfsctl_export*)buf;
 226         return exp_unexport(data);
 227 }
 228
 229 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 230 {
 231         struct nfsctl_fsparm *data;
 232         struct sockaddr_in *sin;
 233         struct auth_domain *clp;
 234         int err = 0;
 235         struct knfsd_fh *res;
 236         struct in6_addr in6;
 237
 238         if (size < sizeof(*data))
 239                 return -EINVAL;
 240         data = (struct nfsctl_fsparm*)buf;
 241         err = -EPROTONOSUPPORT;
 242         if (data->gd_addr.sa_family != AF_INET)
 243                 goto out;
 244         sin = (struct sockaddr_in *)&data->gd_addr;
 245         if (data->gd_maxlen > NFS3_FHSIZE)
 246                 data->gd_maxlen = NFS3_FHSIZE;
 247
 248         res = (struct knfsd_fh*)buf;
 249
 250         exp_readlock();
 251
 252         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 253
 254         clp = auth_unix_lookup(&in6);
 255         if (!clp)
 256                 err = -EPERM;
 257         else {
 258                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 259                 auth_domain_put(clp);
 260         }
 261         exp_readunlock();
 262         if (err == 0)
 263                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
 264  out:
 265         return err;
 266 }
 267
 268 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 269 {
 270         struct nfsctl_fdparm *data;
 271         struct sockaddr_in *sin;
 272         struct auth_domain *clp;
 273         int err = 0;
 274         struct knfsd_fh fh;
 275         char *res;
 276         struct in6_addr in6;
 277
 278         if (size < sizeof(*data))
 279                 return -EINVAL;
 280         data = (struct nfsctl_fdparm*)buf;
 281         err = -EPROTONOSUPPORT;
 282         if (data->gd_addr.sa_family != AF_INET)
 283                 goto out;
 284         err = -EINVAL;
 285         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 286                 goto out;
 287
 288         res = buf;
 289         sin = (struct sockaddr_in *)&data->gd_addr;
 290         exp_readlock();
 291
 292         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
 293
 294         clp = auth_unix_lookup(&in6);
 295         if (!clp)
 296                 err = -EPERM;
 297         else {
 298                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 299                 auth_domain_put(clp);
 300         }
 301         exp_readunlock();
 302
 303         if (err == 0) {
 304                 memset(res,0, NFS_FHSIZE);
 305                 memcpy(res, &fh.fh_base, fh.fh_size);
 306                 err = NFS_FHSIZE;
 307         }
 308  out:
 309         return err;
 310 }
 311
 312 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
 313 {
 314         struct sockaddr_in sin = {
 315                 .sin_family     = AF_INET,
 316         };
 317         int b1, b2, b3, b4;
 318         char c;
 319         char *fo_path;
 320
 321         /* sanity check */
 322         if (size == 0)
 323                 return -EINVAL;
 324
 325         if (buf[size-1] != '\n')
 326                 return -EINVAL;
 327
 328         fo_path = buf;
 329         if (qword_get(&buf, fo_path, size) < 0)
 330                 return -EINVAL;
 331
 332         /* get ipv4 address */
 333         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 334                 return -EINVAL;
 335         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
 336                 return -EINVAL;
 337         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
 338
 339         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
 340 }
 341
 342 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
 343 {
 344         struct path path;
 345         char *fo_path;
 346         int error;
 347
 348         /* sanity check */
 349         if (size == 0)
 350                 return -EINVAL;
 351
 352         if (buf[size-1] != '\n')
 353                 return -EINVAL;
 354
 355         fo_path = buf;
 356         if (qword_get(&buf, fo_path, size) < 0)
 357                 return -EINVAL;
 358
 359         error = kern_path(fo_path, 0, &path);
 360         if (error)
 361                 return error;
 362
 363         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 364
 365         path_put(&path);
 366         return error;
 367 }
 368
 369 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 370 {
 371         /* request is:
 372          *   domain path maxsize
 373          * response is
 374          *   filehandle
 375          *
 376          * qword quoting is used, so filehandle will be \x....
 377          */
 378         char *dname, *path;
 379         int uninitialized_var(maxsize);
 380         char *mesg = buf;
 381         int len;
 382         struct auth_domain *dom;
 383         struct knfsd_fh fh;
 384
 385         if (size == 0)
 386                 return -EINVAL;
 387
 388         if (buf[size-1] != '\n')
 389                 return -EINVAL;
 390         buf[size-1] = 0;
 391
 392         dname = mesg;
 393         len = qword_get(&mesg, dname, size);
 394         if (len <= 0) return -EINVAL;
 395
 396         path = dname+len+1;
 397         len = qword_get(&mesg, path, size);
 398         if (len <= 0) return -EINVAL;
 399
 400         len = get_int(&mesg, &maxsize);
 401         if (len)
 402                 return len;
 403
 404         if (maxsize < NFS_FHSIZE)
 405                 return -EINVAL;
 406         if (maxsize > NFS3_FHSIZE)
 407                 maxsize = NFS3_FHSIZE;
 408
 409         if (qword_get(&mesg, mesg, size)>0)
 410                 return -EINVAL;
 411
 412         /* we have all the words, they are in buf.. */
 413         dom = unix_domain_find(dname);
 414         if (!dom)
 415                 return -ENOMEM;
 416
 417         len = exp_rootfh(dom, path, &fh,  maxsize);
 418         auth_domain_put(dom);
 419         if (len)
 420                 return len;
 421
 422         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 423         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 424         mesg[-1] = '\n';
 425         return mesg - buf;
 426 }
 427
 428 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 429 {
 430         /* if size > 0, look for a number of threads and call nfsd_svc
 431          * then write out number of threads as reply
 432          */
 433         char *mesg = buf;
 434         int rv;
 435         if (size > 0) {
 436                 int newthreads;
 437                 rv = get_int(&mesg, &newthreads);
 438                 if (rv)
 439                         return rv;
 440                 if (newthreads <0)
 441                         return -EINVAL;
 442                 rv = nfsd_svc(2049, newthreads);
 443                 if (rv)
 444                         return rv;
 445         }
 446         sprintf(buf, "%d\n", nfsd_nrthreads());
 447         return strlen(buf);
 448 }
 449
 450 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 451 {
 452         /* if size > 0, look for an array of number of threads per node
 453          * and apply them  then write out number of threads per node as reply
 454          */
 455         char *mesg = buf;
 456         int i;
 457         int rv;
 458         int len;
 459         int npools;
 460         int *nthreads;
 461
 462         mutex_lock(&nfsd_mutex);
 463         npools = nfsd_nrpools();
 464         if (npools == 0) {
 465                 /*
 466                  * NFS is shut down.  The admin can start it by
 467                  * writing to the threads file but NOT the pool_threads
 468                  * file, sorry.  Report zero threads.
 469                  */
 470                 mutex_unlock(&nfsd_mutex);
 471                 strcpy(buf, "0\n");
 472                 return strlen(buf);
 473         }
 474
 475         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 476         rv = -ENOMEM;
 477         if (nthreads == NULL)
 478                 goto out_free;
 479
 480         if (size > 0) {
 481                 for (i = 0; i < npools; i++) {
 482                         rv = get_int(&mesg, &nthreads[i]);
 483                         if (rv == -ENOENT)
 484                                 break;          /* fewer numbers than pools */
 485                         if (rv)
 486                                 goto out_free;  /* syntax error */
 487                         rv = -EINVAL;
 488                         if (nthreads[i] < 0)
 489                                 goto out_free;
 490                 }
 491                 rv = nfsd_set_nrthreads(i, nthreads);
 492                 if (rv)
 493                         goto out_free;
 494         }
 495
 496         rv = nfsd_get_nrthreads(npools, nthreads);
 497         if (rv)
 498                 goto out_free;
 499
 500         mesg = buf;
 501         size = SIMPLE_TRANSACTION_LIMIT;
 502         for (i = 0; i < npools && size > 0; i++) {
 503                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 504                 len = strlen(mesg);
 505                 size -= len;
 506                 mesg += len;
 507         }
 508
 509         mutex_unlock(&nfsd_mutex);
 510         return (mesg-buf);
 511
 512 out_free:
 513         kfree(nthreads);
 514         mutex_unlock(&nfsd_mutex);
 515         return rv;
 516 }
 517
 518 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 519 {
 520         /*
 521          * Format:
 522          *   [-/+]vers [-/+]vers ...
 523          */
 524         char *mesg = buf;
 525         char *vers, sign;
 526         int len, num;
 527         ssize_t tlen = 0;
 528         char *sep;
 529
 530         if (size>0) {
 531                 if (nfsd_serv)
 532                         /* Cannot change versions without updating
 533                          * nfsd_serv->sv_xdrsize, and reallocing
 534                          * rq_argp and rq_resp
 535                          */
 536                         return -EBUSY;
 537                 if (buf[size-1] != '\n')
 538                         return -EINVAL;
 539                 buf[size-1] = 0;
 540
 541                 vers = mesg;
 542                 len = qword_get(&mesg, vers, size);
 543                 if (len <= 0) return -EINVAL;
 544                 do {
 545                         sign = *vers;
 546                         if (sign == '+' || sign == '-')
 547                                 num = simple_strtol((vers+1), NULL, 0);
 548                         else
 549                                 num = simple_strtol(vers, NULL, 0);
 550                         switch(num) {
 551                         case 2:
 552                         case 3:
 553                         case 4:
 554                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 555                                 break;
 556                         default:
 557                                 return -EINVAL;
 558                         }
 559                         vers += len + 1;
 560                         tlen += len;
 561                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 562                 /* If all get turned off, turn them back on, as
 563                  * having no versions is BAD
 564                  */
 565                 nfsd_reset_versions();
 566         }
 567         /* Now write current state into reply buffer */
 568         len = 0;
 569         sep = "";
 570         for (num=2 ; num <= 4 ; num++)
 571                 if (nfsd_vers(num, NFSD_AVAIL)) {
 572                         len += sprintf(buf+len, "%s%c%d", sep,
 573                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 574                                        num);
 575                         sep = " ";
 576                 }
 577         len += sprintf(buf+len, "\n");
 578         return len;
 579 }
 580
 581 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 582 {
 583         ssize_t rv;
 584
 585         mutex_lock(&nfsd_mutex);
 586         rv = __write_versions(file, buf, size);
 587         mutex_unlock(&nfsd_mutex);
 588         return rv;
 589 }
 590
 591 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 592 {
 593         if (size == 0) {
 594                 int len = 0;
 595
 596                 if (nfsd_serv)
 597                         len = svc_xprt_names(nfsd_serv, buf, 0);
 598                 return len;
 599         }
 600         /* Either a single 'fd' number is written, in which
 601          * case it must be for a socket of a supported family/protocol,
 602          * and we use it as an nfsd socket, or
 603          * A '-' followed by the 'name' of a socket in which case
 604          * we close the socket.
 605          */
 606         if (isdigit(buf[0])) {
 607                 char *mesg = buf;
 608                 int fd;
 609                 int err;
 610                 err = get_int(&mesg, &fd);
 611                 if (err)
 612                         return -EINVAL;
 613                 if (fd < 0)
 614                         return -EINVAL;
 615                 err = nfsd_create_serv();
 616                 if (!err) {
 617                         err = svc_addsock(nfsd_serv, fd, buf);
 618                         if (err >= 0) {
 619                                 err = lockd_up();
 620                                 if (err < 0)
 621                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 622                         }
 623                         /* Decrease the count, but don't shutdown the
 624                          * the service
 625                          */
 626                         nfsd_serv->sv_nrthreads--;
 627                 }
 628                 return err < 0 ? err : 0;
 629         }
 630         if (buf[0] == '-' && isdigit(buf[1])) {
 631                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 632                 int len = 0;
 633                 if (!toclose)
 634                         return -ENOMEM;
 635                 if (nfsd_serv)
 636                         len = svc_sock_names(buf, nfsd_serv, toclose);
 637                 if (len >= 0)
 638                         lockd_down();
 639                 kfree(toclose);
 640                 return len;
 641         }
 642         /*
 643          * Add a transport listener by writing it's transport name
 644          */
 645         if (isalpha(buf[0])) {
 646                 int err;
 647                 char transport[16];
 648                 int port;
 649                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 650                         err = nfsd_create_serv();
 651                         if (!err) {
 652                                 err = svc_create_xprt(nfsd_serv,
 653                                                       transport, port,
 654                                                       SVC_SOCK_ANONYMOUS);
 655                                 if (err == -ENOENT)
 656                                         /* Give a reasonable perror msg for
 657                                          * bad transport string */
 658                                         err = -EPROTONOSUPPORT;
 659                         }
 660                         return err < 0 ? err : 0;
 661                 }
 662         }
 663         /*
 664          * Remove a transport by writing it's transport name and port number
 665          */
 666         if (buf[0] == '-' && isalpha(buf[1])) {
 667                 struct svc_xprt *xprt;
 668                 int err = -EINVAL;
 669                 char transport[16];
 670                 int port;
 671                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 672                         if (port == 0)
 673                                 return -EINVAL;
 674                         if (nfsd_serv) {
 675                                 xprt = svc_find_xprt(nfsd_serv, transport,
 676                                                      AF_UNSPEC, port);
 677                                 if (xprt) {
 678                                         svc_close_xprt(xprt);
 679                                         svc_xprt_put(xprt);
 680                                         err = 0;
 681                                 } else
 682                                         err = -ENOTCONN;
 683                         }
 684                         return err < 0 ? err : 0;
 685                 }
 686         }
 687         return -EINVAL;
 688 }
 689
 690 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 691 {
 692         ssize_t rv;
 693
 694         mutex_lock(&nfsd_mutex);
 695         rv = __write_ports(file, buf, size);
 696         mutex_unlock(&nfsd_mutex);
 697         return rv;
 698 }
 699
 700
 701 int nfsd_max_blksize;
 702
 703 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 704 {
 705         char *mesg = buf;
 706         if (size > 0) {
 707                 int bsize;
 708                 int rv = get_int(&mesg, &bsize);
 709                 if (rv)
 710                         return rv;
 711                 /* force bsize into allowed range and
 712                  * required alignment.
 713                  */
 714                 if (bsize < 1024)
 715                         bsize = 1024;
 716                 if (bsize > NFSSVC_MAXBLKSIZE)
 717                         bsize = NFSSVC_MAXBLKSIZE;
 718                 bsize &= ~(1024-1);
 719                 mutex_lock(&nfsd_mutex);
 720                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 721                         mutex_unlock(&nfsd_mutex);
 722                         return -EBUSY;
 723                 }
 724                 nfsd_max_blksize = bsize;
 725                 mutex_unlock(&nfsd_mutex);
 726         }
 727         return sprintf(buf, "%d\n", nfsd_max_blksize);
 728 }
 729
 730 #ifdef CONFIG_NFSD_V4
 731 extern time_t nfs4_leasetime(void);
 732
 733 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
 734 {
 735         /* if size > 10 seconds, call
 736          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 737          */
 738         char *mesg = buf;
 739         int rv, lease;
 740
 741         if (size > 0) {
 742                 if (nfsd_serv)
 743                         return -EBUSY;
 744                 rv = get_int(&mesg, &lease);
 745                 if (rv)
 746                         return rv;
 747                 if (lease < 10 || lease > 3600)
 748                         return -EINVAL;
 749                 nfs4_reset_lease(lease);
 750         }
 751         sprintf(buf, "%ld\n", nfs4_lease_time());
 752         return strlen(buf);
 753 }
 754
 755 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 756 {
 757         ssize_t rv;
 758
 759         mutex_lock(&nfsd_mutex);
 760         rv = __write_leasetime(file, buf, size);
 761         mutex_unlock(&nfsd_mutex);
 762         return rv;
 763 }
 764
 765 extern char *nfs4_recoverydir(void);
 766
 767 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
 768 {
 769         char *mesg = buf;
 770         char *recdir;
 771         int len, status;
 772
 773         if (size > 0) {
 774                 if (nfsd_serv)
 775                         return -EBUSY;
 776                 if (size > PATH_MAX || buf[size-1] != '\n')
 777                         return -EINVAL;
 778                 buf[size-1] = 0;
 779
 780                 recdir = mesg;
 781                 len = qword_get(&mesg, recdir, size);
 782                 if (len <= 0)
 783                         return -EINVAL;
 784
 785                 status = nfs4_reset_recoverydir(recdir);
 786         }
 787         sprintf(buf, "%s\n", nfs4_recoverydir());
 788         return strlen(buf);
 789 }
 790
 791 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 792 {
 793         ssize_t rv;
 794
 795         mutex_lock(&nfsd_mutex);
 796         rv = __write_recoverydir(file, buf, size);
 797         mutex_unlock(&nfsd_mutex);
 798         return rv;
 799 }
 800
 801 #endif
 802
 803 /*----------------------------------------------------------------------------*/
 804 /*
 805  *      populating the filesystem.
 806  */
 807
 808 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 809 {
 810         static struct tree_descr nfsd_files[] = {
 811                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 812                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 813                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 814                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 815                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 816                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 817                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 818                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 819                 [NFSD_FO_UnlockIP] = {"unlock_ip",
 820                                         &transaction_ops, S_IWUSR|S_IRUSR},
 821                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
 822                                         &transaction_ops, S_IWUSR|S_IRUSR},
 823                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 824                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 825                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 826                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 827                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 828                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 829 #ifdef CONFIG_NFSD_V4
 830                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 831                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 832 #endif
 833                 /* last one */ {""}
 834         };
 835         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 836 }
 837
 838 static int nfsd_get_sb(struct file_system_type *fs_type,
 839         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 840 {
 841         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 842 }
 843
 844 static struct file_system_type nfsd_fs_type = {
 845         .owner          = THIS_MODULE,
 846         .name           = "nfsd",
 847         .get_sb         = nfsd_get_sb,
 848         .kill_sb        = kill_litter_super,
 849 };
 850
 851 #ifdef CONFIG_PROC_FS
 852 static int create_proc_exports_entry(void)
 853 {
 854         struct proc_dir_entry *entry;
 855
 856         entry = proc_mkdir("fs/nfs", NULL);
 857         if (!entry)
 858                 return -ENOMEM;
 859         entry = proc_create("exports", 0, entry, &exports_operations);
 860         if (!entry)
 861                 return -ENOMEM;
 862         return 0;
 863 }
 864 #else /* CONFIG_PROC_FS */
 865 static int create_proc_exports_entry(void)
 866 {
 867         return 0;
 868 }
 869 #endif
 870
 871 static int __init init_nfsd(void)
 872 {
 873         int retval;
 874         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 875
 876         retval = nfs4_state_init(); /* nfs4 locking state */
 877         if (retval)
 878                 return retval;
 879         nfsd_stat_init();       /* Statistics */
 880         retval = nfsd_reply_cache_init();
 881         if (retval)
 882                 goto out_free_stat;
 883         retval = nfsd_export_init();
 884         if (retval)
 885                 goto out_free_cache;
 886         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 887         retval = nfsd_idmap_init();
 888         if (retval)
 889                 goto out_free_lockd;
 890         retval = create_proc_exports_entry();
 891         if (retval)
 892                 goto out_free_idmap;
 893         retval = register_filesystem(&nfsd_fs_type);
 894         if (retval)
 895                 goto out_free_all;
 896         return 0;
 897 out_free_all:
 898         remove_proc_entry("fs/nfs/exports", NULL);
 899         remove_proc_entry("fs/nfs", NULL);
 900 out_free_idmap:
 901         nfsd_idmap_shutdown();
 902 out_free_lockd:
 903         nfsd_lockd_shutdown();
 904         nfsd_export_shutdown();
 905 out_free_cache:
 906         nfsd_reply_cache_shutdown();
 907 out_free_stat:
 908         nfsd_stat_shutdown();
 909         nfsd4_free_slabs();
 910         return retval;
 911 }
 912
 913 static void __exit exit_nfsd(void)
 914 {
 915         nfsd_export_shutdown();
 916         nfsd_reply_cache_shutdown();
 917         remove_proc_entry("fs/nfs/exports", NULL);
 918         remove_proc_entry("fs/nfs", NULL);
 919         nfsd_stat_shutdown();
 920         nfsd_lockd_shutdown();
 921         nfsd_idmap_shutdown();
 922         nfsd4_free_slabs();
 923         unregister_filesystem(&nfsd_fs_type);
 924 }
 925
 926 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 927 MODULE_LICENSE("GPL");
 928 module_init(init_nfsd)
 929 module_exit(exit_nfsd)