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   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/module.h>
  10
  11 #include <linux/linkage.h>
  12 #include <linux/time.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/net.h>
  17 #include <linux/in.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/unistd.h>
  20 #include <linux/slab.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/pagemap.h>
  24 #include <linux/init.h>
  25 #include <linux/inet.h>
  26 #include <linux/string.h>
  27 #include <linux/smp_lock.h>
  28 #include <linux/ctype.h>
  29
  30 #include <linux/nfs.h>
  31 #include <linux/nfsd_idmap.h>
  32 #include <linux/lockd/bind.h>
  33 #include <linux/sunrpc/svc.h>
  34 #include <linux/sunrpc/svcsock.h>
  35 #include <linux/nfsd/nfsd.h>
  36 #include <linux/nfsd/cache.h>
  37 #include <linux/nfsd/xdr.h>
  38 #include <linux/nfsd/syscall.h>
  39 #include <linux/lockd/lockd.h>
  40
  41 #include <asm/uaccess.h>
  42 #include <net/ipv6.h>
  43
  44 /*
  45  *      We have a single directory with 9 nodes in it.
  46  */
  47 enum {
  48         NFSD_Root = 1,
  49         NFSD_Svc,
  50         NFSD_Add,
  51         NFSD_Del,
  52         NFSD_Export,
  53         NFSD_Unexport,
  54         NFSD_Getfd,
  55         NFSD_Getfs,
  56         NFSD_List,
  57         NFSD_Fh,
  58         NFSD_FO_UnlockIP,
  59         NFSD_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;
 454         int *nthreads;
 455
 456         mutex_lock(&nfsd_mutex);
 457         npools = nfsd_nrpools();
 458         if (npools == 0) {
 459                 /*
 460                  * NFS is shut down.  The admin can start it by
 461                  * writing to the threads file but NOT the pool_threads
 462                  * file, sorry.  Report zero threads.
 463                  */
 464                 mutex_unlock(&nfsd_mutex);
 465                 strcpy(buf, "0\n");
 466                 return strlen(buf);
 467         }
 468
 469         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 470         rv = -ENOMEM;
 471         if (nthreads == NULL)
 472                 goto out_free;
 473
 474         if (size > 0) {
 475                 for (i = 0; i < npools; i++) {
 476                         rv = get_int(&mesg, &nthreads[i]);
 477                         if (rv == -ENOENT)
 478                                 break;          /* fewer numbers than pools */
 479                         if (rv)
 480                                 goto out_free;  /* syntax error */
 481                         rv = -EINVAL;
 482                         if (nthreads[i] < 0)
 483                                 goto out_free;
 484                 }
 485                 rv = nfsd_set_nrthreads(i, nthreads);
 486                 if (rv)
 487                         goto out_free;
 488         }
 489
 490         rv = nfsd_get_nrthreads(npools, nthreads);
 491         if (rv)
 492                 goto out_free;
 493
 494         mesg = buf;
 495         size = SIMPLE_TRANSACTION_LIMIT;
 496         for (i = 0; i < npools && size > 0; i++) {
 497                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 498                 len = strlen(mesg);
 499                 size -= len;
 500                 mesg += len;
 501         }
 502
 503         mutex_unlock(&nfsd_mutex);
 504         return (mesg-buf);
 505
 506 out_free:
 507         kfree(nthreads);
 508         mutex_unlock(&nfsd_mutex);
 509         return rv;
 510 }
 511
 512 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 513 {
 514         /*
 515          * Format:
 516          *   [-/+]vers [-/+]vers ...
 517          */
 518         char *mesg = buf;
 519         char *vers, sign;
 520         int len, num;
 521         ssize_t tlen = 0;
 522         char *sep;
 523
 524         if (size>0) {
 525                 if (nfsd_serv)
 526                         /* Cannot change versions without updating
 527                          * nfsd_serv->sv_xdrsize, and reallocing
 528                          * rq_argp and rq_resp
 529                          */
 530                         return -EBUSY;
 531                 if (buf[size-1] != '\n')
 532                         return -EINVAL;
 533                 buf[size-1] = 0;
 534
 535                 vers = mesg;
 536                 len = qword_get(&mesg, vers, size);
 537                 if (len <= 0) return -EINVAL;
 538                 do {
 539                         sign = *vers;
 540                         if (sign == '+' || sign == '-')
 541                                 num = simple_strtol((vers+1), NULL, 0);
 542                         else
 543                                 num = simple_strtol(vers, NULL, 0);
 544                         switch(num) {
 545                         case 2:
 546                         case 3:
 547                         case 4:
 548                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 549                                 break;
 550                         default:
 551                                 return -EINVAL;
 552                         }
 553                         vers += len + 1;
 554                         tlen += len;
 555                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 556                 /* If all get turned off, turn them back on, as
 557                  * having no versions is BAD
 558                  */
 559                 nfsd_reset_versions();
 560         }
 561         /* Now write current state into reply buffer */
 562         len = 0;
 563         sep = "";
 564         for (num=2 ; num <= 4 ; num++)
 565                 if (nfsd_vers(num, NFSD_AVAIL)) {
 566                         len += sprintf(buf+len, "%s%c%d", sep,
 567                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 568                                        num);
 569                         sep = " ";
 570                 }
 571         len += sprintf(buf+len, "\n");
 572         return len;
 573 }
 574
 575 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 576 {
 577         ssize_t rv;
 578
 579         mutex_lock(&nfsd_mutex);
 580         rv = __write_versions(file, buf, size);
 581         mutex_unlock(&nfsd_mutex);
 582         return rv;
 583 }
 584
 585 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 586 {
 587         if (size == 0) {
 588                 int len = 0;
 589
 590                 if (nfsd_serv)
 591                         len = svc_xprt_names(nfsd_serv, buf, 0);
 592                 return len;
 593         }
 594         /* Either a single 'fd' number is written, in which
 595          * case it must be for a socket of a supported family/protocol,
 596          * and we use it as an nfsd socket, or
 597          * A '-' followed by the 'name' of a socket in which case
 598          * we close the socket.
 599          */
 600         if (isdigit(buf[0])) {
 601                 char *mesg = buf;
 602                 int fd;
 603                 int err;
 604                 err = get_int(&mesg, &fd);
 605                 if (err)
 606                         return -EINVAL;
 607                 if (fd < 0)
 608                         return -EINVAL;
 609                 err = nfsd_create_serv();
 610                 if (!err) {
 611                         int proto = 0;
 612                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
 613                         if (err >= 0) {
 614                                 err = lockd_up(proto);
 615                                 if (err < 0)
 616                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
 617                         }
 618                         /* Decrease the count, but don't shutdown the
 619                          * the service
 620                          */
 621                         nfsd_serv->sv_nrthreads--;
 622                 }
 623                 return err < 0 ? err : 0;
 624         }
 625         if (buf[0] == '-' && isdigit(buf[1])) {
 626                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 627                 int len = 0;
 628                 if (!toclose)
 629                         return -ENOMEM;
 630                 if (nfsd_serv)
 631                         len = svc_sock_names(buf, nfsd_serv, toclose);
 632                 if (len >= 0)
 633                         lockd_down();
 634                 kfree(toclose);
 635                 return len;
 636         }
 637         /*
 638          * Add a transport listener by writing it's transport name
 639          */
 640         if (isalpha(buf[0])) {
 641                 int err;
 642                 char transport[16];
 643                 int port;
 644                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
 645                         err = nfsd_create_serv();
 646                         if (!err) {
 647                                 err = svc_create_xprt(nfsd_serv,
 648                                                       transport, port,
 649                                                       SVC_SOCK_ANONYMOUS);
 650                                 if (err == -ENOENT)
 651                                         /* Give a reasonable perror msg for
 652                                          * bad transport string */
 653                                         err = -EPROTONOSUPPORT;
 654                         }
 655                         return err < 0 ? err : 0;
 656                 }
 657         }
 658         /*
 659          * Remove a transport by writing it's transport name and port number
 660          */
 661         if (buf[0] == '-' && isalpha(buf[1])) {
 662                 struct svc_xprt *xprt;
 663                 int err = -EINVAL;
 664                 char transport[16];
 665                 int port;
 666                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
 667                         if (port == 0)
 668                                 return -EINVAL;
 669                         if (nfsd_serv) {
 670                                 xprt = svc_find_xprt(nfsd_serv, transport,
 671                                                      AF_UNSPEC, port);
 672                                 if (xprt) {
 673                                         svc_close_xprt(xprt);
 674                                         svc_xprt_put(xprt);
 675                                         err = 0;
 676                                 } else
 677                                         err = -ENOTCONN;
 678                         }
 679                         return err < 0 ? err : 0;
 680                 }
 681         }
 682         return -EINVAL;
 683 }
 684
 685 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 686 {
 687         ssize_t rv;
 688
 689         mutex_lock(&nfsd_mutex);
 690         rv = __write_ports(file, buf, size);
 691         mutex_unlock(&nfsd_mutex);
 692         return rv;
 693 }
 694
 695
 696 int nfsd_max_blksize;
 697
 698 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 699 {
 700         char *mesg = buf;
 701         if (size > 0) {
 702                 int bsize;
 703                 int rv = get_int(&mesg, &bsize);
 704                 if (rv)
 705                         return rv;
 706                 /* force bsize into allowed range and
 707                  * required alignment.
 708                  */
 709                 if (bsize < 1024)
 710                         bsize = 1024;
 711                 if (bsize > NFSSVC_MAXBLKSIZE)
 712                         bsize = NFSSVC_MAXBLKSIZE;
 713                 bsize &= ~(1024-1);
 714                 mutex_lock(&nfsd_mutex);
 715                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
 716                         mutex_unlock(&nfsd_mutex);
 717                         return -EBUSY;
 718                 }
 719                 nfsd_max_blksize = bsize;
 720                 mutex_unlock(&nfsd_mutex);
 721         }
 722         return sprintf(buf, "%d\n", nfsd_max_blksize);
 723 }
 724
 725 #ifdef CONFIG_NFSD_V4
 726 extern time_t nfs4_leasetime(void);
 727
 728 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
 729 {
 730         /* if size > 10 seconds, call
 731          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 732          */
 733         char *mesg = buf;
 734         int rv, lease;
 735
 736         if (size > 0) {
 737                 if (nfsd_serv)
 738                         return -EBUSY;
 739                 rv = get_int(&mesg, &lease);
 740                 if (rv)
 741                         return rv;
 742                 if (lease < 10 || lease > 3600)
 743                         return -EINVAL;
 744                 nfs4_reset_lease(lease);
 745         }
 746         sprintf(buf, "%ld\n", nfs4_lease_time());
 747         return strlen(buf);
 748 }
 749
 750 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 751 {
 752         ssize_t rv;
 753
 754         mutex_lock(&nfsd_mutex);
 755         rv = __write_leasetime(file, buf, size);
 756         mutex_unlock(&nfsd_mutex);
 757         return rv;
 758 }
 759
 760 extern char *nfs4_recoverydir(void);
 761
 762 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
 763 {
 764         char *mesg = buf;
 765         char *recdir;
 766         int len, status;
 767
 768         if (size > 0) {
 769                 if (nfsd_serv)
 770                         return -EBUSY;
 771                 if (size > PATH_MAX || buf[size-1] != '\n')
 772                         return -EINVAL;
 773                 buf[size-1] = 0;
 774
 775                 recdir = mesg;
 776                 len = qword_get(&mesg, recdir, size);
 777                 if (len <= 0)
 778                         return -EINVAL;
 779
 780                 status = nfs4_reset_recoverydir(recdir);
 781         }
 782         sprintf(buf, "%s\n", nfs4_recoverydir());
 783         return strlen(buf);
 784 }
 785
 786 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 787 {
 788         ssize_t rv;
 789
 790         mutex_lock(&nfsd_mutex);
 791         rv = __write_recoverydir(file, buf, size);
 792         mutex_unlock(&nfsd_mutex);
 793         return rv;
 794 }
 795
 796 #endif
 797
 798 /*----------------------------------------------------------------------------*/
 799 /*
 800  *      populating the filesystem.
 801  */
 802
 803 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 804 {
 805         static struct tree_descr nfsd_files[] = {
 806                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 807                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 808                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 809                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 810                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 811                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 812                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 813                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 814                 [NFSD_FO_UnlockIP] = {"unlock_ip",
 815                                         &transaction_ops, S_IWUSR|S_IRUSR},
 816                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
 817                                         &transaction_ops, S_IWUSR|S_IRUSR},
 818                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 819                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 820                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 821                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 822                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 823                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 824 #ifdef CONFIG_NFSD_V4
 825                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 826                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 827 #endif
 828                 /* last one */ {""}
 829         };
 830         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 831 }
 832
 833 static int nfsd_get_sb(struct file_system_type *fs_type,
 834         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 835 {
 836         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 837 }
 838
 839 static struct file_system_type nfsd_fs_type = {
 840         .owner          = THIS_MODULE,
 841         .name           = "nfsd",
 842         .get_sb         = nfsd_get_sb,
 843         .kill_sb        = kill_litter_super,
 844 };
 845
 846 #ifdef CONFIG_PROC_FS
 847 static int create_proc_exports_entry(void)
 848 {
 849         struct proc_dir_entry *entry;
 850
 851         entry = proc_mkdir("fs/nfs", NULL);
 852         if (!entry)
 853                 return -ENOMEM;
 854         entry = proc_create("exports", 0, entry, &exports_operations);
 855         if (!entry)
 856                 return -ENOMEM;
 857         return 0;
 858 }
 859 #else /* CONFIG_PROC_FS */
 860 static int create_proc_exports_entry(void)
 861 {
 862         return 0;
 863 }
 864 #endif
 865
 866 static int __init init_nfsd(void)
 867 {
 868         int retval;
 869         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 870
 871         retval = nfs4_state_init(); /* nfs4 locking state */
 872         if (retval)
 873                 return retval;
 874         nfsd_stat_init();       /* Statistics */
 875         retval = nfsd_reply_cache_init();
 876         if (retval)
 877                 goto out_free_stat;
 878         retval = nfsd_export_init();
 879         if (retval)
 880                 goto out_free_cache;
 881         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 882         retval = nfsd_idmap_init();
 883         if (retval)
 884                 goto out_free_lockd;
 885         retval = create_proc_exports_entry();
 886         if (retval)
 887                 goto out_free_idmap;
 888         retval = register_filesystem(&nfsd_fs_type);
 889         if (retval)
 890                 goto out_free_all;
 891         return 0;
 892 out_free_all:
 893         remove_proc_entry("fs/nfs/exports", NULL);
 894         remove_proc_entry("fs/nfs", NULL);
 895 out_free_idmap:
 896         nfsd_idmap_shutdown();
 897 out_free_lockd:
 898         nfsd_lockd_shutdown();
 899         nfsd_export_shutdown();
 900 out_free_cache:
 901         nfsd_reply_cache_shutdown();
 902 out_free_stat:
 903         nfsd_stat_shutdown();
 904         nfsd4_free_slabs();
 905         return retval;
 906 }
 907
 908 static void __exit exit_nfsd(void)
 909 {
 910         nfsd_export_shutdown();
 911         nfsd_reply_cache_shutdown();
 912         remove_proc_entry("fs/nfs/exports", NULL);
 913         remove_proc_entry("fs/nfs", NULL);
 914         nfsd_stat_shutdown();
 915         nfsd_lockd_shutdown();
 916         nfsd_idmap_shutdown();
 917         nfsd4_free_slabs();
 918         unregister_filesystem(&nfsd_fs_type);
 919 }
 920
 921 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 922 MODULE_LICENSE("GPL");
 923 module_init(init_nfsd)
 924 module_exit(exit_nfsd)