fs/nfsd/nfsctl.c

   1 /*
   2  * Syscall interface to knfsd.
   3  *
   4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/namei.h>
   9 #include <linux/ctype.h>
  10
  11 #include <linux/sunrpc/svcsock.h>
  12 #include <linux/lockd/lockd.h>
  13 #include <linux/sunrpc/addr.h>
  14 #include <linux/sunrpc/gss_api.h>
  15 #include <linux/sunrpc/gss_krb5_enctypes.h>
  16 #include <linux/sunrpc/rpc_pipe_fs.h>
  17 #include <linux/module.h>
  18
  19 #include "idmap.h"
  20 #include "nfsd.h"
  21 #include "cache.h"
  22 #include "state.h"
  23 #include "netns.h"
  24
  25 /*
  26  *      We have a single directory with several nodes in it.
  27  */
  28 enum {
  29         NFSD_Root = 1,
  30         NFSD_List,
  31         NFSD_Export_features,
  32         NFSD_Fh,
  33         NFSD_FO_UnlockIP,
  34         NFSD_FO_UnlockFS,
  35         NFSD_Threads,
  36         NFSD_Pool_Threads,
  37         NFSD_Pool_Stats,
  38         NFSD_Versions,
  39         NFSD_Ports,
  40         NFSD_MaxBlkSize,
  41         NFSD_SupportedEnctypes,
  42         /*
  43          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  44          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  45          */
  46 #ifdef CONFIG_NFSD_V4
  47         NFSD_Leasetime,
  48         NFSD_Gracetime,
  49         NFSD_RecoveryDir,
  50 #endif
  51 };
  52
  53 /*
  54  * write() for these nodes.
  55  */
  56 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  57 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  58 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  59 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  60 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  61 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  62 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  63 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  64 #ifdef CONFIG_NFSD_V4
  65 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  66 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  67 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  68 #endif
  69
  70 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  71         [NFSD_Fh] = write_filehandle,
  72         [NFSD_FO_UnlockIP] = write_unlock_ip,
  73         [NFSD_FO_UnlockFS] = write_unlock_fs,
  74         [NFSD_Threads] = write_threads,
  75         [NFSD_Pool_Threads] = write_pool_threads,
  76         [NFSD_Versions] = write_versions,
  77         [NFSD_Ports] = write_ports,
  78         [NFSD_MaxBlkSize] = write_maxblksize,
  79 #ifdef CONFIG_NFSD_V4
  80         [NFSD_Leasetime] = write_leasetime,
  81         [NFSD_Gracetime] = write_gracetime,
  82         [NFSD_RecoveryDir] = write_recoverydir,
  83 #endif
  84 };
  85
  86 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  87 {
  88         ino_t ino =  file_inode(file)->i_ino;
  89         char *data;
  90         ssize_t rv;
  91
  92         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
  93                 return -EINVAL;
  94
  95         data = simple_transaction_get(file, buf, size);
  96         if (IS_ERR(data))
  97                 return PTR_ERR(data);
  98
  99         rv =  write_op[ino](file, data, size);
 100         if (rv >= 0) {
 101                 simple_transaction_set(file, rv);
 102                 rv = size;
 103         }
 104         return rv;
 105 }
 106
 107 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 108 {
 109         if (! file->private_data) {
 110                 /* An attempt to read a transaction file without writing
 111                  * causes a 0-byte write so that the file can return
 112                  * state information
 113                  */
 114                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 115                 if (rv < 0)
 116                         return rv;
 117         }
 118         return simple_transaction_read(file, buf, size, pos);
 119 }
 120
 121 static const struct file_operations transaction_ops = {
 122         .write          = nfsctl_transaction_write,
 123         .read           = nfsctl_transaction_read,
 124         .release        = simple_transaction_release,
 125         .llseek         = default_llseek,
 126 };
 127
 128 static int exports_net_open(struct net *net, struct file *file)
 129 {
 130         int err;
 131         struct seq_file *seq;
 132         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 133
 134         err = seq_open(file, &nfs_exports_op);
 135         if (err)
 136                 return err;
 137
 138         seq = file->private_data;
 139         seq->private = nn->svc_export_cache;
 140         return 0;
 141 }
 142
 143 static int exports_proc_open(struct inode *inode, struct file *file)
 144 {
 145         return exports_net_open(current->nsproxy->net_ns, file);
 146 }
 147
 148 static const struct file_operations exports_proc_operations = {
 149         .open           = exports_proc_open,
 150         .read           = seq_read,
 151         .llseek         = seq_lseek,
 152         .release        = seq_release,
 153         .owner          = THIS_MODULE,
 154 };
 155
 156 static int exports_nfsd_open(struct inode *inode, struct file *file)
 157 {
 158         return exports_net_open(inode->i_sb->s_fs_info, file);
 159 }
 160
 161 static const struct file_operations exports_nfsd_operations = {
 162         .open           = exports_nfsd_open,
 163         .read           = seq_read,
 164         .llseek         = seq_lseek,
 165         .release        = seq_release,
 166         .owner          = THIS_MODULE,
 167 };
 168
 169 static int export_features_show(struct seq_file *m, void *v)
 170 {
 171         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 172         return 0;
 173 }
 174
 175 static int export_features_open(struct inode *inode, struct file *file)
 176 {
 177         return single_open(file, export_features_show, NULL);
 178 }
 179
 180 static struct file_operations export_features_operations = {
 181         .open           = export_features_open,
 182         .read           = seq_read,
 183         .llseek         = seq_lseek,
 184         .release        = single_release,
 185 };
 186
 187 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 188 static int supported_enctypes_show(struct seq_file *m, void *v)
 189 {
 190         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 191         return 0;
 192 }
 193
 194 static int supported_enctypes_open(struct inode *inode, struct file *file)
 195 {
 196         return single_open(file, supported_enctypes_show, NULL);
 197 }
 198
 199 static struct file_operations supported_enctypes_ops = {
 200         .open           = supported_enctypes_open,
 201         .read           = seq_read,
 202         .llseek         = seq_lseek,
 203         .release        = single_release,
 204 };
 205 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 206
 207 static const struct file_operations pool_stats_operations = {
 208         .open           = nfsd_pool_stats_open,
 209         .read           = seq_read,
 210         .llseek         = seq_lseek,
 211         .release        = nfsd_pool_stats_release,
 212         .owner          = THIS_MODULE,
 213 };
 214
 215 /*----------------------------------------------------------------------------*/
 216 /*
 217  * payload - write methods
 218  */
 219
 220
 221 /**
 222  * write_unlock_ip - Release all locks used by a client
 223  *
 224  * Experimental.
 225  *
 226  * Input:
 227  *                      buf:    '\n'-terminated C string containing a
 228  *                              presentation format IP address
 229  *                      size:   length of C string in @buf
 230  * Output:
 231  *      On success:     returns zero if all specified locks were released;
 232  *                      returns one if one or more locks were not released
 233  *      On error:       return code is negative errno value
 234  */
 235 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 236 {
 237         struct sockaddr_storage address;
 238         struct sockaddr *sap = (struct sockaddr *)&address;
 239         size_t salen = sizeof(address);
 240         char *fo_path;
 241         struct net *net = file->f_dentry->d_sb->s_fs_info;
 242
 243         /* sanity check */
 244         if (size == 0)
 245                 return -EINVAL;
 246
 247         if (buf[size-1] != '\n')
 248                 return -EINVAL;
 249
 250         fo_path = buf;
 251         if (qword_get(&buf, fo_path, size) < 0)
 252                 return -EINVAL;
 253
 254         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
 255                 return -EINVAL;
 256
 257         return nlmsvc_unlock_all_by_ip(sap);
 258 }
 259
 260 /**
 261  * write_unlock_fs - Release all locks on a local file system
 262  *
 263  * Experimental.
 264  *
 265  * Input:
 266  *                      buf:    '\n'-terminated C string containing the
 267  *                              absolute pathname of a local file system
 268  *                      size:   length of C string in @buf
 269  * Output:
 270  *      On success:     returns zero if all specified locks were released;
 271  *                      returns one if one or more locks were not released
 272  *      On error:       return code is negative errno value
 273  */
 274 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 275 {
 276         struct path path;
 277         char *fo_path;
 278         int error;
 279
 280         /* sanity check */
 281         if (size == 0)
 282                 return -EINVAL;
 283
 284         if (buf[size-1] != '\n')
 285                 return -EINVAL;
 286
 287         fo_path = buf;
 288         if (qword_get(&buf, fo_path, size) < 0)
 289                 return -EINVAL;
 290
 291         error = kern_path(fo_path, 0, &path);
 292         if (error)
 293                 return error;
 294
 295         /*
 296          * XXX: Needs better sanity checking.  Otherwise we could end up
 297          * releasing locks on the wrong file system.
 298          *
 299          * For example:
 300          * 1.  Does the path refer to a directory?
 301          * 2.  Is that directory a mount point, or
 302          * 3.  Is that directory the root of an exported file system?
 303          */
 304         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 305
 306         path_put(&path);
 307         return error;
 308 }
 309
 310 /**
 311  * write_filehandle - Get a variable-length NFS file handle by path
 312  *
 313  * On input, the buffer contains a '\n'-terminated C string comprised of
 314  * three alphanumeric words separated by whitespace.  The string may
 315  * contain escape sequences.
 316  *
 317  * Input:
 318  *                      buf:
 319  *                              domain:         client domain name
 320  *                              path:           export pathname
 321  *                              maxsize:        numeric maximum size of
 322  *                                              @buf
 323  *                      size:   length of C string in @buf
 324  * Output:
 325  *      On success:     passed-in buffer filled with '\n'-terminated C
 326  *                      string containing a ASCII hex text version
 327  *                      of the NFS file handle;
 328  *                      return code is the size in bytes of the string
 329  *      On error:       return code is negative errno value
 330  */
 331 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 332 {
 333         char *dname, *path;
 334         int uninitialized_var(maxsize);
 335         char *mesg = buf;
 336         int len;
 337         struct auth_domain *dom;
 338         struct knfsd_fh fh;
 339         struct net *net = file->f_dentry->d_sb->s_fs_info;
 340
 341         if (size == 0)
 342                 return -EINVAL;
 343
 344         if (buf[size-1] != '\n')
 345                 return -EINVAL;
 346         buf[size-1] = 0;
 347
 348         dname = mesg;
 349         len = qword_get(&mesg, dname, size);
 350         if (len <= 0)
 351                 return -EINVAL;
 352
 353         path = dname+len+1;
 354         len = qword_get(&mesg, path, size);
 355         if (len <= 0)
 356                 return -EINVAL;
 357
 358         len = get_int(&mesg, &maxsize);
 359         if (len)
 360                 return len;
 361
 362         if (maxsize < NFS_FHSIZE)
 363                 return -EINVAL;
 364         if (maxsize > NFS3_FHSIZE)
 365                 maxsize = NFS3_FHSIZE;
 366
 367         if (qword_get(&mesg, mesg, size)>0)
 368                 return -EINVAL;
 369
 370         /* we have all the words, they are in buf.. */
 371         dom = unix_domain_find(dname);
 372         if (!dom)
 373                 return -ENOMEM;
 374
 375         len = exp_rootfh(net, dom, path, &fh,  maxsize);
 376         auth_domain_put(dom);
 377         if (len)
 378                 return len;
 379
 380         mesg = buf;
 381         len = SIMPLE_TRANSACTION_LIMIT;
 382         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 383         mesg[-1] = '\n';
 384         return mesg - buf;
 385 }
 386
 387 /**
 388  * write_threads - Start NFSD, or report the current number of running threads
 389  *
 390  * Input:
 391  *                      buf:            ignored
 392  *                      size:           zero
 393  * Output:
 394  *      On success:     passed-in buffer filled with '\n'-terminated C
 395  *                      string numeric value representing the number of
 396  *                      running NFSD threads;
 397  *                      return code is the size in bytes of the string
 398  *      On error:       return code is zero
 399  *
 400  * OR
 401  *
 402  * Input:
 403  *                      buf:            C string containing an unsigned
 404  *                                      integer value representing the
 405  *                                      number of NFSD threads to start
 406  *                      size:           non-zero length of C string in @buf
 407  * Output:
 408  *      On success:     NFS service is started;
 409  *                      passed-in buffer filled with '\n'-terminated C
 410  *                      string numeric value representing the number of
 411  *                      running NFSD threads;
 412  *                      return code is the size in bytes of the string
 413  *      On error:       return code is zero or a negative errno value
 414  */
 415 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 416 {
 417         char *mesg = buf;
 418         int rv;
 419         struct net *net = file->f_dentry->d_sb->s_fs_info;
 420
 421         if (size > 0) {
 422                 int newthreads;
 423                 rv = get_int(&mesg, &newthreads);
 424                 if (rv)
 425                         return rv;
 426                 if (newthreads < 0)
 427                         return -EINVAL;
 428                 rv = nfsd_svc(newthreads, net);
 429                 if (rv < 0)
 430                         return rv;
 431         } else
 432                 rv = nfsd_nrthreads(net);
 433
 434         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 435 }
 436
 437 /**
 438  * write_pool_threads - Set or report the current number of threads per pool
 439  *
 440  * Input:
 441  *                      buf:            ignored
 442  *                      size:           zero
 443  *
 444  * OR
 445  *
 446  * Input:
 447  *                      buf:            C string containing whitespace-
 448  *                                      separated unsigned integer values
 449  *                                      representing the number of NFSD
 450  *                                      threads to start in each pool
 451  *                      size:           non-zero length of C string in @buf
 452  * Output:
 453  *      On success:     passed-in buffer filled with '\n'-terminated C
 454  *                      string containing integer values representing the
 455  *                      number of NFSD threads in each pool;
 456  *                      return code is the size in bytes of the string
 457  *      On error:       return code is zero or a negative errno value
 458  */
 459 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 460 {
 461         /* if size > 0, look for an array of number of threads per node
 462          * and apply them  then write out number of threads per node as reply
 463          */
 464         char *mesg = buf;
 465         int i;
 466         int rv;
 467         int len;
 468         int npools;
 469         int *nthreads;
 470         struct net *net = file->f_dentry->d_sb->s_fs_info;
 471
 472         mutex_lock(&nfsd_mutex);
 473         npools = nfsd_nrpools(net);
 474         if (npools == 0) {
 475                 /*
 476                  * NFS is shut down.  The admin can start it by
 477                  * writing to the threads file but NOT the pool_threads
 478                  * file, sorry.  Report zero threads.
 479                  */
 480                 mutex_unlock(&nfsd_mutex);
 481                 strcpy(buf, "0\n");
 482                 return strlen(buf);
 483         }
 484
 485         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 486         rv = -ENOMEM;
 487         if (nthreads == NULL)
 488                 goto out_free;
 489
 490         if (size > 0) {
 491                 for (i = 0; i < npools; i++) {
 492                         rv = get_int(&mesg, &nthreads[i]);
 493                         if (rv == -ENOENT)
 494                                 break;          /* fewer numbers than pools */
 495                         if (rv)
 496                                 goto out_free;  /* syntax error */
 497                         rv = -EINVAL;
 498                         if (nthreads[i] < 0)
 499                                 goto out_free;
 500                 }
 501                 rv = nfsd_set_nrthreads(i, nthreads, net);
 502                 if (rv)
 503                         goto out_free;
 504         }
 505
 506         rv = nfsd_get_nrthreads(npools, nthreads, net);
 507         if (rv)
 508                 goto out_free;
 509
 510         mesg = buf;
 511         size = SIMPLE_TRANSACTION_LIMIT;
 512         for (i = 0; i < npools && size > 0; i++) {
 513                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 514                 len = strlen(mesg);
 515                 size -= len;
 516                 mesg += len;
 517         }
 518         rv = mesg - buf;
 519 out_free:
 520         kfree(nthreads);
 521         mutex_unlock(&nfsd_mutex);
 522         return rv;
 523 }
 524
 525 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 526 {
 527         char *mesg = buf;
 528         char *vers, *minorp, sign;
 529         int len, num, remaining;
 530         unsigned minor;
 531         ssize_t tlen = 0;
 532         char *sep;
 533         struct net *net = file->f_dentry->d_sb->s_fs_info;
 534         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 535
 536         if (size>0) {
 537                 if (nn->nfsd_serv)
 538                         /* Cannot change versions without updating
 539                          * nn->nfsd_serv->sv_xdrsize, and reallocing
 540                          * rq_argp and rq_resp
 541                          */
 542                         return -EBUSY;
 543                 if (buf[size-1] != '\n')
 544                         return -EINVAL;
 545                 buf[size-1] = 0;
 546
 547                 vers = mesg;
 548                 len = qword_get(&mesg, vers, size);
 549                 if (len <= 0) return -EINVAL;
 550                 do {
 551                         sign = *vers;
 552                         if (sign == '+' || sign == '-')
 553                                 num = simple_strtol((vers+1), &minorp, 0);
 554                         else
 555                                 num = simple_strtol(vers, &minorp, 0);
 556                         if (*minorp == '.') {
 557                                 if (num != 4)
 558                                         return -EINVAL;
 559                                 minor = simple_strtoul(minorp+1, NULL, 0);
 560                                 if (minor == 0)
 561                                         return -EINVAL;
 562                                 if (nfsd_minorversion(minor, sign == '-' ?
 563                                                      NFSD_CLEAR : NFSD_SET) < 0)
 564                                         return -EINVAL;
 565                                 goto next;
 566                         }
 567                         switch(num) {
 568                         case 2:
 569                         case 3:
 570                         case 4:
 571                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 572                                 break;
 573                         default:
 574                                 return -EINVAL;
 575                         }
 576                 next:
 577                         vers += len + 1;
 578                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 579                 /* If all get turned off, turn them back on, as
 580                  * having no versions is BAD
 581                  */
 582                 nfsd_reset_versions();
 583         }
 584
 585         /* Now write current state into reply buffer */
 586         len = 0;
 587         sep = "";
 588         remaining = SIMPLE_TRANSACTION_LIMIT;
 589         for (num=2 ; num <= 4 ; num++)
 590                 if (nfsd_vers(num, NFSD_AVAIL)) {
 591                         len = snprintf(buf, remaining, "%s%c%d", sep,
 592                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 593                                        num);
 594                         sep = " ";
 595
 596                         if (len > remaining)
 597                                 break;
 598                         remaining -= len;
 599                         buf += len;
 600                         tlen += len;
 601                 }
 602         if (nfsd_vers(4, NFSD_AVAIL))
 603                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 604                      minor++) {
 605                         len = snprintf(buf, remaining, " %c4.%u",
 606                                         (nfsd_vers(4, NFSD_TEST) &&
 607                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 608                                                 '+' : '-',
 609                                         minor);
 610
 611                         if (len > remaining)
 612                                 break;
 613                         remaining -= len;
 614                         buf += len;
 615                         tlen += len;
 616                 }
 617
 618         len = snprintf(buf, remaining, "\n");
 619         if (len > remaining)
 620                 return -EINVAL;
 621         return tlen + len;
 622 }
 623
 624 /**
 625  * write_versions - Set or report the available NFS protocol versions
 626  *
 627  * Input:
 628  *                      buf:            ignored
 629  *                      size:           zero
 630  * Output:
 631  *      On success:     passed-in buffer filled with '\n'-terminated C
 632  *                      string containing positive or negative integer
 633  *                      values representing the current status of each
 634  *                      protocol version;
 635  *                      return code is the size in bytes of the string
 636  *      On error:       return code is zero or a negative errno value
 637  *
 638  * OR
 639  *
 640  * Input:
 641  *                      buf:            C string containing whitespace-
 642  *                                      separated positive or negative
 643  *                                      integer values representing NFS
 644  *                                      protocol versions to enable ("+n")
 645  *                                      or disable ("-n")
 646  *                      size:           non-zero length of C string in @buf
 647  * Output:
 648  *      On success:     status of zero or more protocol versions has
 649  *                      been updated; passed-in buffer filled with
 650  *                      '\n'-terminated C string containing positive
 651  *                      or negative integer values representing the
 652  *                      current status of each protocol version;
 653  *                      return code is the size in bytes of the string
 654  *      On error:       return code is zero or a negative errno value
 655  */
 656 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 657 {
 658         ssize_t rv;
 659
 660         mutex_lock(&nfsd_mutex);
 661         rv = __write_versions(file, buf, size);
 662         mutex_unlock(&nfsd_mutex);
 663         return rv;
 664 }
 665
 666 /*
 667  * Zero-length write.  Return a list of NFSD's current listener
 668  * transports.
 669  */
 670 static ssize_t __write_ports_names(char *buf, struct net *net)
 671 {
 672         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 673
 674         if (nn->nfsd_serv == NULL)
 675                 return 0;
 676         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 677 }
 678
 679 /*
 680  * A single 'fd' number was written, in which case it must be for
 681  * a socket of a supported family/protocol, and we use it as an
 682  * nfsd listener.
 683  */
 684 static ssize_t __write_ports_addfd(char *buf, struct net *net)
 685 {
 686         char *mesg = buf;
 687         int fd, err;
 688         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 689
 690         err = get_int(&mesg, &fd);
 691         if (err != 0 || fd < 0)
 692                 return -EINVAL;
 693
 694         err = nfsd_create_serv(net);
 695         if (err != 0)
 696                 return err;
 697
 698         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 699         if (err < 0) {
 700                 nfsd_destroy(net);
 701                 return err;
 702         }
 703
 704         /* Decrease the count, but don't shut down the service */
 705         nn->nfsd_serv->sv_nrthreads--;
 706         return err;
 707 }
 708
 709 /*
 710  * A transport listener is added by writing it's transport name and
 711  * a port number.
 712  */
 713 static ssize_t __write_ports_addxprt(char *buf, struct net *net)
 714 {
 715         char transport[16];
 716         struct svc_xprt *xprt;
 717         int port, err;
 718         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 719
 720         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
 721                 return -EINVAL;
 722
 723         if (port < 1 || port > USHRT_MAX)
 724                 return -EINVAL;
 725
 726         err = nfsd_create_serv(net);
 727         if (err != 0)
 728                 return err;
 729
 730         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 731                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 732         if (err < 0)
 733                 goto out_err;
 734
 735         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 736                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
 737         if (err < 0 && err != -EAFNOSUPPORT)
 738                 goto out_close;
 739
 740         /* Decrease the count, but don't shut down the service */
 741         nn->nfsd_serv->sv_nrthreads--;
 742         return 0;
 743 out_close:
 744         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
 745         if (xprt != NULL) {
 746                 svc_close_xprt(xprt);
 747                 svc_xprt_put(xprt);
 748         }
 749 out_err:
 750         nfsd_destroy(net);
 751         return err;
 752 }
 753
 754 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
 755                              struct net *net)
 756 {
 757         if (size == 0)
 758                 return __write_ports_names(buf, net);
 759
 760         if (isdigit(buf[0]))
 761                 return __write_ports_addfd(buf, net);
 762
 763         if (isalpha(buf[0]))
 764                 return __write_ports_addxprt(buf, net);
 765
 766         return -EINVAL;
 767 }
 768
 769 /**
 770  * write_ports - Pass a socket file descriptor or transport name to listen on
 771  *
 772  * Input:
 773  *                      buf:            ignored
 774  *                      size:           zero
 775  * Output:
 776  *      On success:     passed-in buffer filled with a '\n'-terminated C
 777  *                      string containing a whitespace-separated list of
 778  *                      named NFSD listeners;
 779  *                      return code is the size in bytes of the string
 780  *      On error:       return code is zero or a negative errno value
 781  *
 782  * OR
 783  *
 784  * Input:
 785  *                      buf:            C string containing an unsigned
 786  *                                      integer value representing a bound
 787  *                                      but unconnected socket that is to be
 788  *                                      used as an NFSD listener; listen(3)
 789  *                                      must be called for a SOCK_STREAM
 790  *                                      socket, otherwise it is ignored
 791  *                      size:           non-zero length of C string in @buf
 792  * Output:
 793  *      On success:     NFS service is started;
 794  *                      passed-in buffer filled with a '\n'-terminated C
 795  *                      string containing a unique alphanumeric name of
 796  *                      the listener;
 797  *                      return code is the size in bytes of the string
 798  *      On error:       return code is a negative errno value
 799  *
 800  * OR
 801  *
 802  * Input:
 803  *                      buf:            C string containing a transport
 804  *                                      name and an unsigned integer value
 805  *                                      representing the port to listen on,
 806  *                                      separated by whitespace
 807  *                      size:           non-zero length of C string in @buf
 808  * Output:
 809  *      On success:     returns zero; NFS service is started
 810  *      On error:       return code is a negative errno value
 811  */
 812 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 813 {
 814         ssize_t rv;
 815         struct net *net = file->f_dentry->d_sb->s_fs_info;
 816
 817         mutex_lock(&nfsd_mutex);
 818         rv = __write_ports(file, buf, size, net);
 819         mutex_unlock(&nfsd_mutex);
 820         return rv;
 821 }
 822
 823
 824 int nfsd_max_blksize;
 825
 826 /**
 827  * write_maxblksize - Set or report the current NFS blksize
 828  *
 829  * Input:
 830  *                      buf:            ignored
 831  *                      size:           zero
 832  *
 833  * OR
 834  *
 835  * Input:
 836  *                      buf:            C string containing an unsigned
 837  *                                      integer value representing the new
 838  *                                      NFS blksize
 839  *                      size:           non-zero length of C string in @buf
 840  * Output:
 841  *      On success:     passed-in buffer filled with '\n'-terminated C string
 842  *                      containing numeric value of the current NFS blksize
 843  *                      setting;
 844  *                      return code is the size in bytes of the string
 845  *      On error:       return code is zero or a negative errno value
 846  */
 847 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 848 {
 849         char *mesg = buf;
 850         struct net *net = file->f_dentry->d_sb->s_fs_info;
 851         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 852
 853         if (size > 0) {
 854                 int bsize;
 855                 int rv = get_int(&mesg, &bsize);
 856                 if (rv)
 857                         return rv;
 858                 /* force bsize into allowed range and
 859                  * required alignment.
 860                  */
 861                 if (bsize < 1024)
 862                         bsize = 1024;
 863                 if (bsize > NFSSVC_MAXBLKSIZE)
 864                         bsize = NFSSVC_MAXBLKSIZE;
 865                 bsize &= ~(1024-1);
 866                 mutex_lock(&nfsd_mutex);
 867                 if (nn->nfsd_serv) {
 868                         mutex_unlock(&nfsd_mutex);
 869                         return -EBUSY;
 870                 }
 871                 nfsd_max_blksize = bsize;
 872                 mutex_unlock(&nfsd_mutex);
 873         }
 874
 875         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 876                                                         nfsd_max_blksize);
 877 }
 878
 879 #ifdef CONFIG_NFSD_V4
 880 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
 881                                   time_t *time, struct nfsd_net *nn)
 882 {
 883         char *mesg = buf;
 884         int rv, i;
 885
 886         if (size > 0) {
 887                 if (nn->nfsd_serv)
 888                         return -EBUSY;
 889                 rv = get_int(&mesg, &i);
 890                 if (rv)
 891                         return rv;
 892                 /*
 893                  * Some sanity checking.  We don't have a reason for
 894                  * these particular numbers, but problems with the
 895                  * extremes are:
 896                  *      - Too short: the briefest network outage may
 897                  *        cause clients to lose all their locks.  Also,
 898                  *        the frequent polling may be wasteful.
 899                  *      - Too long: do you really want reboot recovery
 900                  *        to take more than an hour?  Or to make other
 901                  *        clients wait an hour before being able to
 902                  *        revoke a dead client's locks?
 903                  */
 904                 if (i < 10 || i > 3600)
 905                         return -EINVAL;
 906                 *time = i;
 907         }
 908
 909         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 910 }
 911
 912 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
 913                                 time_t *time, struct nfsd_net *nn)
 914 {
 915         ssize_t rv;
 916
 917         mutex_lock(&nfsd_mutex);
 918         rv = __nfsd4_write_time(file, buf, size, time, nn);
 919         mutex_unlock(&nfsd_mutex);
 920         return rv;
 921 }
 922
 923 /**
 924  * write_leasetime - Set or report the current NFSv4 lease time
 925  *
 926  * Input:
 927  *                      buf:            ignored
 928  *                      size:           zero
 929  *
 930  * OR
 931  *
 932  * Input:
 933  *                      buf:            C string containing an unsigned
 934  *                                      integer value representing the new
 935  *                                      NFSv4 lease expiry time
 936  *                      size:           non-zero length of C string in @buf
 937  * Output:
 938  *      On success:     passed-in buffer filled with '\n'-terminated C
 939  *                      string containing unsigned integer value of the
 940  *                      current lease expiry time;
 941  *                      return code is the size in bytes of the string
 942  *      On error:       return code is zero or a negative errno value
 943  */
 944 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 945 {
 946         struct net *net = file->f_dentry->d_sb->s_fs_info;
 947         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 948         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
 949 }
 950
 951 /**
 952  * write_gracetime - Set or report current NFSv4 grace period time
 953  *
 954  * As above, but sets the time of the NFSv4 grace period.
 955  *
 956  * Note this should never be set to less than the *previous*
 957  * lease-period time, but we don't try to enforce this.  (In the common
 958  * case (a new boot), we don't know what the previous lease time was
 959  * anyway.)
 960  */
 961 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
 962 {
 963         struct net *net = file->f_dentry->d_sb->s_fs_info;
 964         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 965         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
 966 }
 967
 968 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
 969                                    struct nfsd_net *nn)
 970 {
 971         char *mesg = buf;
 972         char *recdir;
 973         int len, status;
 974
 975         if (size > 0) {
 976                 if (nn->nfsd_serv)
 977                         return -EBUSY;
 978                 if (size > PATH_MAX || buf[size-1] != '\n')
 979                         return -EINVAL;
 980                 buf[size-1] = 0;
 981
 982                 recdir = mesg;
 983                 len = qword_get(&mesg, recdir, size);
 984                 if (len <= 0)
 985                         return -EINVAL;
 986
 987                 status = nfs4_reset_recoverydir(recdir);
 988                 if (status)
 989                         return status;
 990         }
 991
 992         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
 993                                                         nfs4_recoverydir());
 994 }
 995
 996 /**
 997  * write_recoverydir - Set or report the pathname of the recovery directory
 998  *
 999  * Input:
1000  *                      buf:            ignored
1001  *                      size:           zero
1002  *
1003  * OR
1004  *
1005  * Input:
1006  *                      buf:            C string containing the pathname
1007  *                                      of the directory on a local file
1008  *                                      system containing permanent NFSv4
1009  *                                      recovery data
1010  *                      size:           non-zero length of C string in @buf
1011  * Output:
1012  *      On success:     passed-in buffer filled with '\n'-terminated C string
1013  *                      containing the current recovery pathname setting;
1014  *                      return code is the size in bytes of the string
1015  *      On error:       return code is zero or a negative errno value
1016  */
1017 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1018 {
1019         ssize_t rv;
1020         struct net *net = file->f_dentry->d_sb->s_fs_info;
1021         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1022
1023         mutex_lock(&nfsd_mutex);
1024         rv = __write_recoverydir(file, buf, size, nn);
1025         mutex_unlock(&nfsd_mutex);
1026         return rv;
1027 }
1028
1029 #endif
1030
1031 /*----------------------------------------------------------------------------*/
1032 /*
1033  *      populating the filesystem.
1034  */
1035
1036 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1037 {
1038         static struct tree_descr nfsd_files[] = {
1039                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1040                 [NFSD_Export_features] = {"export_features",
1041                                         &export_features_operations, S_IRUGO},
1042                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1043                                         &transaction_ops, S_IWUSR|S_IRUSR},
1044                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1045                                         &transaction_ops, S_IWUSR|S_IRUSR},
1046                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1047                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1048                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1049                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1050                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1051                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1052                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1053 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1054                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1055 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1056 #ifdef CONFIG_NFSD_V4
1057                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1058                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1059                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1060 #endif
1061                 /* last one */ {""}
1062         };
1063         struct net *net = data;
1064         int ret;
1065
1066         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1067         if (ret)
1068                 return ret;
1069         sb->s_fs_info = get_net(net);
1070         return 0;
1071 }
1072
1073 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1074         int flags, const char *dev_name, void *data)
1075 {
1076         return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1077 }
1078
1079 static void nfsd_umount(struct super_block *sb)
1080 {
1081         struct net *net = sb->s_fs_info;
1082
1083         kill_litter_super(sb);
1084         put_net(net);
1085 }
1086
1087 static struct file_system_type nfsd_fs_type = {
1088         .owner          = THIS_MODULE,
1089         .name           = "nfsd",
1090         .mount          = nfsd_mount,
1091         .kill_sb        = nfsd_umount,
1092 };
1093
1094 #ifdef CONFIG_PROC_FS
1095 static int create_proc_exports_entry(void)
1096 {
1097         struct proc_dir_entry *entry;
1098
1099         entry = proc_mkdir("fs/nfs", NULL);
1100         if (!entry)
1101                 return -ENOMEM;
1102         entry = proc_create("exports", 0, entry,
1103                                  &exports_proc_operations);
1104         if (!entry)
1105                 return -ENOMEM;
1106         return 0;
1107 }
1108 #else /* CONFIG_PROC_FS */
1109 static int create_proc_exports_entry(void)
1110 {
1111         return 0;
1112 }
1113 #endif
1114
1115 int nfsd_net_id;
1116
1117 static __net_init int nfsd_init_net(struct net *net)
1118 {
1119         int retval;
1120         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1121
1122         retval = nfsd_export_init(net);
1123         if (retval)
1124                 goto out_export_error;
1125         retval = nfsd_idmap_init(net);
1126         if (retval)
1127                 goto out_idmap_error;
1128         nn->nfsd4_lease = 90;   /* default lease time */
1129         nn->nfsd4_grace = 90;
1130         return 0;
1131
1132 out_idmap_error:
1133         nfsd_export_shutdown(net);
1134 out_export_error:
1135         return retval;
1136 }
1137
1138 static __net_exit void nfsd_exit_net(struct net *net)
1139 {
1140         nfsd_idmap_shutdown(net);
1141         nfsd_export_shutdown(net);
1142 }
1143
1144 static struct pernet_operations nfsd_net_ops = {
1145         .init = nfsd_init_net,
1146         .exit = nfsd_exit_net,
1147         .id   = &nfsd_net_id,
1148         .size = sizeof(struct nfsd_net),
1149 };
1150
1151 static int __init init_nfsd(void)
1152 {
1153         int retval;
1154         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1155
1156         retval = register_cld_notifier();
1157         if (retval)
1158                 return retval;
1159         retval = register_pernet_subsys(&nfsd_net_ops);
1160         if (retval < 0)
1161                 goto out_unregister_notifier;
1162         retval = nfsd4_init_slabs();
1163         if (retval)
1164                 goto out_unregister_pernet;
1165         nfs4_state_init();
1166         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1167         if (retval)
1168                 goto out_free_slabs;
1169         nfsd_stat_init();       /* Statistics */
1170         retval = nfsd_reply_cache_init();
1171         if (retval)
1172                 goto out_free_stat;
1173         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1174         retval = create_proc_exports_entry();
1175         if (retval)
1176                 goto out_free_lockd;
1177         retval = register_filesystem(&nfsd_fs_type);
1178         if (retval)
1179                 goto out_free_all;
1180         return 0;
1181 out_free_all:
1182         remove_proc_entry("fs/nfs/exports", NULL);
1183         remove_proc_entry("fs/nfs", NULL);
1184 out_free_lockd:
1185         nfsd_lockd_shutdown();
1186         nfsd_reply_cache_shutdown();
1187 out_free_stat:
1188         nfsd_stat_shutdown();
1189         nfsd_fault_inject_cleanup();
1190 out_free_slabs:
1191         nfsd4_free_slabs();
1192 out_unregister_pernet:
1193         unregister_pernet_subsys(&nfsd_net_ops);
1194 out_unregister_notifier:
1195         unregister_cld_notifier();
1196         return retval;
1197 }
1198
1199 static void __exit exit_nfsd(void)
1200 {
1201         nfsd_reply_cache_shutdown();
1202         remove_proc_entry("fs/nfs/exports", NULL);
1203         remove_proc_entry("fs/nfs", NULL);
1204         nfsd_stat_shutdown();
1205         nfsd_lockd_shutdown();
1206         nfsd4_free_slabs();
1207         nfsd_fault_inject_cleanup();
1208         unregister_filesystem(&nfsd_fs_type);
1209         unregister_pernet_subsys(&nfsd_net_ops);
1210         unregister_cld_notifier();
1211 }
1212
1213 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1214 MODULE_LICENSE("GPL");
1215 module_init(init_nfsd)
1216 module_exit(exit_nfsd)