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   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/module.h>
  10
  11 #include <linux/linkage.h>
  12 #include <linux/time.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/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_unlock_ip(struct file *file, char *buf, size_t size);
  88 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  89 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  90 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  91 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  92 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  93 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  94 #ifdef CONFIG_NFSD_V4
  95 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  96 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  97 #endif
  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] = write_unlock_ip,
 109         [NFSD_FO_UnlockFS] = write_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 write_unlock_ip(struct file *file, char *buf, size_t size)
 312 {
 313         struct sockaddr_in sin = {
 314                 .sin_family     = AF_INET,
 315         };
 316         int b1, b2, b3, b4;
 317         char c;
 318         char *fo_path;
 319
 320         /* sanity check */
 321         if (size == 0)
 322                 return -EINVAL;
 323
 324         if (buf[size-1] != '\n')
 325                 return -EINVAL;
 326
 327         fo_path = buf;
 328         if (qword_get(&buf, fo_path, size) < 0)
 329                 return -EINVAL;
 330
 331         /* get ipv4 address */
 332         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 333                 return -EINVAL;
 334         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
 335                 return -EINVAL;
 336         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
 337
 338         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
 339 }
 340
 341 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 342 {
 343         struct path path;
 344         char *fo_path;
 345         int error;
 346
 347         /* sanity check */
 348         if (size == 0)
 349                 return -EINVAL;
 350
 351         if (buf[size-1] != '\n')
 352                 return -EINVAL;
 353
 354         fo_path = buf;
 355         if (qword_get(&buf, fo_path, size) < 0)
 356                 return -EINVAL;
 357
 358         error = kern_path(fo_path, 0, &path);
 359         if (error)
 360                 return error;
 361
 362         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 363
 364         path_put(&path);
 365         return error;
 366 }
 367
 368 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 369 {
 370         /* request is:
 371          *   domain path maxsize
 372          * response is
 373          *   filehandle
 374          *
 375          * qword quoting is used, so filehandle will be \x....
 376          */
 377         char *dname, *path;
 378         int uninitialized_var(maxsize);
 379         char *mesg = buf;
 380         int len;
 381         struct auth_domain *dom;
 382         struct knfsd_fh fh;
 383
 384         if (size == 0)
 385                 return -EINVAL;
 386
 387         if (buf[size-1] != '\n')
 388                 return -EINVAL;
 389         buf[size-1] = 0;
 390
 391         dname = mesg;
 392         len = qword_get(&mesg, dname, size);
 393         if (len <= 0)
 394                 return -EINVAL;
 395
 396         path = dname+len+1;
 397         len = qword_get(&mesg, path, size);
 398         if (len <= 0)
 399                 return -EINVAL;
 400
 401         len = get_int(&mesg, &maxsize);
 402         if (len)
 403                 return len;
 404
 405         if (maxsize < NFS_FHSIZE)
 406                 return -EINVAL;
 407         if (maxsize > NFS3_FHSIZE)
 408                 maxsize = NFS3_FHSIZE;
 409
 410         if (qword_get(&mesg, mesg, size)>0)
 411                 return -EINVAL;
 412
 413         /* we have all the words, they are in buf.. */
 414         dom = unix_domain_find(dname);
 415         if (!dom)
 416                 return -ENOMEM;
 417
 418         len = exp_rootfh(dom, path, &fh,  maxsize);
 419         auth_domain_put(dom);
 420         if (len)
 421                 return len;
 422
 423         mesg = buf;
 424         len = SIMPLE_TRANSACTION_LIMIT;
 425         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 426         mesg[-1] = '\n';
 427         return mesg - buf;
 428 }
 429
 430 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 431 {
 432         /* if size > 0, look for a number of threads and call nfsd_svc
 433          * then write out number of threads as reply
 434          */
 435         char *mesg = buf;
 436         int rv;
 437         if (size > 0) {
 438                 int newthreads;
 439                 rv = get_int(&mesg, &newthreads);
 440                 if (rv)
 441                         return rv;
 442                 if (newthreads <0)
 443                         return -EINVAL;
 444                 rv = nfsd_svc(2049, newthreads);
 445                 if (rv)
 446                         return rv;
 447         }
 448         sprintf(buf, "%d\n", nfsd_nrthreads());
 449         return strlen(buf);
 450 }
 451
 452 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 453 {
 454         /* if size > 0, look for an array of number of threads per node
 455          * and apply them  then write out number of threads per node as reply
 456          */
 457         char *mesg = buf;
 458         int i;
 459         int rv;
 460         int len;
 461         int npools;
 462         int *nthreads;
 463
 464         mutex_lock(&nfsd_mutex);
 465         npools = nfsd_nrpools();
 466         if (npools == 0) {
 467                 /*
 468                  * NFS is shut down.  The admin can start it by
 469                  * writing to the threads file but NOT the pool_threads
 470                  * file, sorry.  Report zero threads.
 471                  */
 472                 mutex_unlock(&nfsd_mutex);
 473                 strcpy(buf, "0\n");
 474                 return strlen(buf);
 475         }
 476
 477         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 478         rv = -ENOMEM;
 479         if (nthreads == NULL)
 480                 goto out_free;
 481
 482         if (size > 0) {
 483                 for (i = 0; i < npools; i++) {
 484                         rv = get_int(&mesg, &nthreads[i]);
 485                         if (rv == -ENOENT)
 486                                 break;          /* fewer numbers than pools */
 487                         if (rv)
 488                                 goto out_free;  /* syntax error */
 489                         rv = -EINVAL;
 490                         if (nthreads[i] < 0)
 491                                 goto out_free;
 492                 }
 493                 rv = nfsd_set_nrthreads(i, nthreads);
 494                 if (rv)
 495                         goto out_free;
 496         }
 497
 498         rv = nfsd_get_nrthreads(npools, nthreads);
 499         if (rv)
 500                 goto out_free;
 501
 502         mesg = buf;
 503         size = SIMPLE_TRANSACTION_LIMIT;
 504         for (i = 0; i < npools && size > 0; i++) {
 505                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 506                 len = strlen(mesg);
 507                 size -= len;
 508                 mesg += len;
 509         }
 510
 511         mutex_unlock(&nfsd_mutex);
 512         return (mesg-buf);
 513
 514 out_free:
 515         kfree(nthreads);
 516         mutex_unlock(&nfsd_mutex);
 517         return rv;
 518 }
 519
 520 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 521 {
 522         /*
 523          * Format:
 524          *   [-/+]vers [-/+]vers ...
 525          */
 526         char *mesg = buf;
 527         char *vers, sign;
 528         int len, num;
 529         ssize_t tlen = 0;
 530         char *sep;
 531
 532         if (size>0) {
 533                 if (nfsd_serv)
 534                         /* Cannot change versions without updating
 535                          * nfsd_serv->sv_xdrsize, and reallocing
 536                          * rq_argp and rq_resp
 537                          */
 538                         return -EBUSY;
 539                 if (buf[size-1] != '\n')
 540                         return -EINVAL;
 541                 buf[size-1] = 0;
 542
 543                 vers = mesg;
 544                 len = qword_get(&mesg, vers, size);
 545                 if (len <= 0) return -EINVAL;
 546                 do {
 547                         sign = *vers;
 548                         if (sign == '+' || sign == '-')
 549                                 num = simple_strtol((vers+1), NULL, 0);
 550                         else
 551                                 num = simple_strtol(vers, NULL, 0);
 552                         switch(num) {
 553                         case 2:
 554                         case 3:
 555                         case 4:
 556                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 557                                 break;
 558                         default:
 559                                 return -EINVAL;
 560                         }
 561                         vers += len + 1;
 562                         tlen += len;
 563                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 564                 /* If all get turned off, turn them back on, as
 565                  * having no versions is BAD
 566                  */
 567                 nfsd_reset_versions();
 568         }
 569         /* Now write current state into reply buffer */
 570         len = 0;
 571         sep = "";
 572         for (num=2 ; num <= 4 ; num++)
 573                 if (nfsd_vers(num, NFSD_AVAIL)) {
 574                         len += sprintf(buf+len, "%s%c%d", sep,
 575                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 576                                        num);
 577                         sep = " ";
 578                 }
 579         len += sprintf(buf+len, "\n");
 580         return len;
 581 }
 582
 583 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 584 {
 585         ssize_t rv;
 586
 587         mutex_lock(&nfsd_mutex);
 588         rv = __write_versions(file, buf, size);
 589         mutex_unlock(&nfsd_mutex);
 590         return rv;
 591 }
 592
 593 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 594 {
 595         if (size == 0) {
 596                 int len = 0;
 597
 598                 if (nfsd_serv)
 599                         len = svc_xprt_names(nfsd_serv, buf, 0);
 600                 return len;
 601         }
 602         /* Either a single 'fd' number is written, in which
 603          * case it must be for a socket of a supported family/protocol,
 604          * and we use it as an nfsd socket, or
 605          * A '-' followed by the 'name' of a socket in which case
 606          * we close the socket.
 607          */
 608         if (isdigit(buf[0])) {
 609                 char *mesg = buf;
 610                 int fd;
 611                 int err;
 612                 err = get_int(&mesg, &fd);
 613                 if (err)
 614                         return -EINVAL;
 615                 if (fd < 0)
 616                         return -EINVAL;
 617                 err = nfsd_create_serv();
 618                 if (!err) {
 619                         err = svc_addsock(nfsd_serv, fd, buf);
 620                         if (err >= 0) {
 621                                 err = lockd_up();
 622                                 if (err < 0)
 623                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 624                         }
 625                         /* Decrease the count, but don't shutdown the
 626                          * the service
 627                          */
 628                         nfsd_serv->sv_nrthreads--;
 629                 }
 630                 return err < 0 ? err : 0;
 631         }
 632         if (buf[0] == '-' && isdigit(buf[1])) {
 633                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 634                 int len = 0;
 635                 if (!toclose)
 636                         return -ENOMEM;
 637                 if (nfsd_serv)
 638                         len = svc_sock_names(buf, nfsd_serv, toclose);
 639                 if (len >= 0)
 640                         lockd_down();
 641                 kfree(toclose);
 642                 return len;
 643         }
 644         /*
 645          * Add a transport listener by writing it's transport name
 646          */
 647         if (isalpha(buf[0])) {
 648                 int err;
 649                 char transport[16];
 650                 int port;
 651                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 652                         err = nfsd_create_serv();
 653                         if (!err) {
 654                                 err = svc_create_xprt(nfsd_serv,
 655                                                       transport, port,
 656                                                       SVC_SOCK_ANONYMOUS);
 657                                 if (err == -ENOENT)
 658                                         /* Give a reasonable perror msg for
 659                                          * bad transport string */
 660                                         err = -EPROTONOSUPPORT;
 661                         }
 662                         return err < 0 ? err : 0;
 663                 }
 664         }
 665         /*
 666          * Remove a transport by writing it's transport name and port number
 667          */
 668         if (buf[0] == '-' && isalpha(buf[1])) {
 669                 struct svc_xprt *xprt;
 670                 int err = -EINVAL;
 671                 char transport[16];
 672                 int port;
 673                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 674                         if (port == 0)
 675                                 return -EINVAL;
 676                         if (nfsd_serv) {
 677                                 xprt = svc_find_xprt(nfsd_serv, transport,
 678                                                      AF_UNSPEC, port);
 679                                 if (xprt) {
 680                                         svc_close_xprt(xprt);
 681                                         svc_xprt_put(xprt);
 682                                         err = 0;
 683                                 } else
 684                                         err = -ENOTCONN;
 685                         }
 686                         return err < 0 ? err : 0;
 687                 }
 688         }
 689         return -EINVAL;
 690 }
 691
 692 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 693 {
 694         ssize_t rv;
 695
 696         mutex_lock(&nfsd_mutex);
 697         rv = __write_ports(file, buf, size);
 698         mutex_unlock(&nfsd_mutex);
 699         return rv;
 700 }
 701
 702
 703 int nfsd_max_blksize;
 704
 705 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 706 {
 707         char *mesg = buf;
 708         if (size > 0) {
 709                 int bsize;
 710                 int rv = get_int(&mesg, &bsize);
 711                 if (rv)
 712                         return rv;
 713                 /* force bsize into allowed range and
 714                  * required alignment.
 715                  */
 716                 if (bsize < 1024)
 717                         bsize = 1024;
 718                 if (bsize > NFSSVC_MAXBLKSIZE)
 719                         bsize = NFSSVC_MAXBLKSIZE;
 720                 bsize &= ~(1024-1);
 721                 mutex_lock(&nfsd_mutex);
 722                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 723                         mutex_unlock(&nfsd_mutex);
 724                         return -EBUSY;
 725                 }
 726                 nfsd_max_blksize = bsize;
 727                 mutex_unlock(&nfsd_mutex);
 728         }
 729         return sprintf(buf, "%d\n", nfsd_max_blksize);
 730 }
 731
 732 #ifdef CONFIG_NFSD_V4
 733 extern time_t nfs4_leasetime(void);
 734
 735 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
 736 {
 737         /* if size > 10 seconds, call
 738          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 739          */
 740         char *mesg = buf;
 741         int rv, lease;
 742
 743         if (size > 0) {
 744                 if (nfsd_serv)
 745                         return -EBUSY;
 746                 rv = get_int(&mesg, &lease);
 747                 if (rv)
 748                         return rv;
 749                 if (lease < 10 || lease > 3600)
 750                         return -EINVAL;
 751                 nfs4_reset_lease(lease);
 752         }
 753         sprintf(buf, "%ld\n", nfs4_lease_time());
 754         return strlen(buf);
 755 }
 756
 757 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 758 {
 759         ssize_t rv;
 760
 761         mutex_lock(&nfsd_mutex);
 762         rv = __write_leasetime(file, buf, size);
 763         mutex_unlock(&nfsd_mutex);
 764         return rv;
 765 }
 766
 767 extern char *nfs4_recoverydir(void);
 768
 769 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
 770 {
 771         char *mesg = buf;
 772         char *recdir;
 773         int len, status;
 774
 775         if (size > 0) {
 776                 if (nfsd_serv)
 777                         return -EBUSY;
 778                 if (size > PATH_MAX || buf[size-1] != '\n')
 779                         return -EINVAL;
 780                 buf[size-1] = 0;
 781
 782                 recdir = mesg;
 783                 len = qword_get(&mesg, recdir, size);
 784                 if (len <= 0)
 785                         return -EINVAL;
 786
 787                 status = nfs4_reset_recoverydir(recdir);
 788         }
 789         sprintf(buf, "%s\n", nfs4_recoverydir());
 790         return strlen(buf);
 791 }
 792
 793 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 794 {
 795         ssize_t rv;
 796
 797         mutex_lock(&nfsd_mutex);
 798         rv = __write_recoverydir(file, buf, size);
 799         mutex_unlock(&nfsd_mutex);
 800         return rv;
 801 }
 802
 803 #endif
 804
 805 /*----------------------------------------------------------------------------*/
 806 /*
 807  *      populating the filesystem.
 808  */
 809
 810 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 811 {
 812         static struct tree_descr nfsd_files[] = {
 813                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 814                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 815                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 816                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 817                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 818                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 819                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 820                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 821                 [NFSD_FO_UnlockIP] = {"unlock_ip",
 822                                         &transaction_ops, S_IWUSR|S_IRUSR},
 823                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
 824                                         &transaction_ops, S_IWUSR|S_IRUSR},
 825                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 826                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 827                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 828                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 829                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 830                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 831 #ifdef CONFIG_NFSD_V4
 832                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 833                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 834 #endif
 835                 /* last one */ {""}
 836         };
 837         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 838 }
 839
 840 static int nfsd_get_sb(struct file_system_type *fs_type,
 841         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 842 {
 843         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 844 }
 845
 846 static struct file_system_type nfsd_fs_type = {
 847         .owner          = THIS_MODULE,
 848         .name           = "nfsd",
 849         .get_sb         = nfsd_get_sb,
 850         .kill_sb        = kill_litter_super,
 851 };
 852
 853 #ifdef CONFIG_PROC_FS
 854 static int create_proc_exports_entry(void)
 855 {
 856         struct proc_dir_entry *entry;
 857
 858         entry = proc_mkdir("fs/nfs", NULL);
 859         if (!entry)
 860                 return -ENOMEM;
 861         entry = proc_create("exports", 0, entry, &exports_operations);
 862         if (!entry)
 863                 return -ENOMEM;
 864         return 0;
 865 }
 866 #else /* CONFIG_PROC_FS */
 867 static int create_proc_exports_entry(void)
 868 {
 869         return 0;
 870 }
 871 #endif
 872
 873 static int __init init_nfsd(void)
 874 {
 875         int retval;
 876         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 877
 878         retval = nfs4_state_init(); /* nfs4 locking state */
 879         if (retval)
 880                 return retval;
 881         nfsd_stat_init();       /* Statistics */
 882         retval = nfsd_reply_cache_init();
 883         if (retval)
 884                 goto out_free_stat;
 885         retval = nfsd_export_init();
 886         if (retval)
 887                 goto out_free_cache;
 888         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 889         retval = nfsd_idmap_init();
 890         if (retval)
 891                 goto out_free_lockd;
 892         retval = create_proc_exports_entry();
 893         if (retval)
 894                 goto out_free_idmap;
 895         retval = register_filesystem(&nfsd_fs_type);
 896         if (retval)
 897                 goto out_free_all;
 898         return 0;
 899 out_free_all:
 900         remove_proc_entry("fs/nfs/exports", NULL);
 901         remove_proc_entry("fs/nfs", NULL);
 902 out_free_idmap:
 903         nfsd_idmap_shutdown();
 904 out_free_lockd:
 905         nfsd_lockd_shutdown();
 906         nfsd_export_shutdown();
 907 out_free_cache:
 908         nfsd_reply_cache_shutdown();
 909 out_free_stat:
 910         nfsd_stat_shutdown();
 911         nfsd4_free_slabs();
 912         return retval;
 913 }
 914
 915 static void __exit exit_nfsd(void)
 916 {
 917         nfsd_export_shutdown();
 918         nfsd_reply_cache_shutdown();
 919         remove_proc_entry("fs/nfs/exports", NULL);
 920         remove_proc_entry("fs/nfs", NULL);
 921         nfsd_stat_shutdown();
 922         nfsd_lockd_shutdown();
 923         nfsd_idmap_shutdown();
 924         nfsd4_free_slabs();
 925         unregister_filesystem(&nfsd_fs_type);
 926 }
 927
 928 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 929 MODULE_LICENSE("GPL");
 930 module_init(init_nfsd)
 931 module_exit(exit_nfsd)