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