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