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