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