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
  17 #include "idmap.h"
  18 #include "nfsd.h"
  19 #include "cache.h"
  20
  21 /*
  22  *      We have a single directory with several nodes in it.
  23  */
  24 enum {
  25         NFSD_Root = 1,
  26         NFSD_List,
  27         NFSD_Export_features,
  28         NFSD_Fh,
  29         NFSD_FO_UnlockIP,
  30         NFSD_FO_UnlockFS,
  31         NFSD_Threads,
  32         NFSD_Pool_Threads,
  33         NFSD_Pool_Stats,
  34         NFSD_Versions,
  35         NFSD_Ports,
  36         NFSD_MaxBlkSize,
  37         NFSD_SupportedEnctypes,
  38         /*
  39          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  40          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  41          */
  42 #ifdef CONFIG_NFSD_V4
  43         NFSD_Leasetime,
  44         NFSD_Gracetime,
  45         NFSD_RecoveryDir,
  46 #endif
  47 };
  48
  49 /*
  50  * write() for these nodes.
  51  */
  52 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  53 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  54 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  55 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  56 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  57 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  58 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  59 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  60 #ifdef CONFIG_NFSD_V4
  61 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  62 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  63 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  64 #endif
  65
  66 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  67         [NFSD_Fh] = write_filehandle,
  68         [NFSD_FO_UnlockIP] = write_unlock_ip,
  69         [NFSD_FO_UnlockFS] = write_unlock_fs,
  70         [NFSD_Threads] = write_threads,
  71         [NFSD_Pool_Threads] = write_pool_threads,
  72         [NFSD_Versions] = write_versions,
  73         [NFSD_Ports] = write_ports,
  74         [NFSD_MaxBlkSize] = write_maxblksize,
  75 #ifdef CONFIG_NFSD_V4
  76         [NFSD_Leasetime] = write_leasetime,
  77         [NFSD_Gracetime] = write_gracetime,
  78         [NFSD_RecoveryDir] = write_recoverydir,
  79 #endif
  80 };
  81
  82 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  83 {
  84         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
  85         char *data;
  86         ssize_t rv;
  87
  88         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
  89                 return -EINVAL;
  90
  91         data = simple_transaction_get(file, buf, size);
  92         if (IS_ERR(data))
  93                 return PTR_ERR(data);
  94
  95         rv =  write_op[ino](file, data, size);
  96         if (rv >= 0) {
  97                 simple_transaction_set(file, rv);
  98                 rv = size;
  99         }
 100         return rv;
 101 }
 102
 103 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 104 {
 105         if (! file->private_data) {
 106                 /* An attempt to read a transaction file without writing
 107                  * causes a 0-byte write so that the file can return
 108                  * state information
 109                  */
 110                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 111                 if (rv < 0)
 112                         return rv;
 113         }
 114         return simple_transaction_read(file, buf, size, pos);
 115 }
 116
 117 static const struct file_operations transaction_ops = {
 118         .write          = nfsctl_transaction_write,
 119         .read           = nfsctl_transaction_read,
 120         .release        = simple_transaction_release,
 121         .llseek         = default_llseek,
 122 };
 123
 124 static int exports_open(struct inode *inode, struct file *file)
 125 {
 126         return seq_open(file, &nfs_exports_op);
 127 }
 128
 129 static const struct file_operations exports_operations = {
 130         .open           = exports_open,
 131         .read           = seq_read,
 132         .llseek         = seq_lseek,
 133         .release        = seq_release,
 134         .owner          = THIS_MODULE,
 135 };
 136
 137 static int export_features_show(struct seq_file *m, void *v)
 138 {
 139         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 140         return 0;
 141 }
 142
 143 static int export_features_open(struct inode *inode, struct file *file)
 144 {
 145         return single_open(file, export_features_show, NULL);
 146 }
 147
 148 static struct file_operations export_features_operations = {
 149         .open           = export_features_open,
 150         .read           = seq_read,
 151         .llseek         = seq_lseek,
 152         .release        = single_release,
 153 };
 154
 155 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 156 static int supported_enctypes_show(struct seq_file *m, void *v)
 157 {
 158         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 159         return 0;
 160 }
 161
 162 static int supported_enctypes_open(struct inode *inode, struct file *file)
 163 {
 164         return single_open(file, supported_enctypes_show, NULL);
 165 }
 166
 167 static struct file_operations supported_enctypes_ops = {
 168         .open           = supported_enctypes_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = single_release,
 172 };
 173 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 174
 175 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 176 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 177
 178 static const struct file_operations pool_stats_operations = {
 179         .open           = nfsd_pool_stats_open,
 180         .read           = seq_read,
 181         .llseek         = seq_lseek,
 182         .release        = nfsd_pool_stats_release,
 183         .owner          = THIS_MODULE,
 184 };
 185
 186 /*----------------------------------------------------------------------------*/
 187 /*
 188  * payload - write methods
 189  */
 190
 191
 192 /**
 193  * write_unlock_ip - Release all locks used by a client
 194  *
 195  * Experimental.
 196  *
 197  * Input:
 198  *                      buf:    '\n'-terminated C string containing a
 199  *                              presentation format IP address
 200  *                      size:   length of C string in @buf
 201  * Output:
 202  *      On success:     returns zero if all specified locks were released;
 203  *                      returns one if one or more locks were not released
 204  *      On error:       return code is negative errno value
 205  */
 206 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 207 {
 208         struct sockaddr_storage address;
 209         struct sockaddr *sap = (struct sockaddr *)&address;
 210         size_t salen = sizeof(address);
 211         char *fo_path;
 212
 213         /* sanity check */
 214         if (size == 0)
 215                 return -EINVAL;
 216
 217         if (buf[size-1] != '\n')
 218                 return -EINVAL;
 219
 220         fo_path = buf;
 221         if (qword_get(&buf, fo_path, size) < 0)
 222                 return -EINVAL;
 223
 224         if (rpc_pton(fo_path, size, sap, salen) == 0)
 225                 return -EINVAL;
 226
 227         return nlmsvc_unlock_all_by_ip(sap);
 228 }
 229
 230 /**
 231  * write_unlock_fs - Release all locks on a local file system
 232  *
 233  * Experimental.
 234  *
 235  * Input:
 236  *                      buf:    '\n'-terminated C string containing the
 237  *                              absolute pathname of a local file system
 238  *                      size:   length of C string in @buf
 239  * Output:
 240  *      On success:     returns zero if all specified locks were released;
 241  *                      returns one if one or more locks were not released
 242  *      On error:       return code is negative errno value
 243  */
 244 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 245 {
 246         struct path path;
 247         char *fo_path;
 248         int error;
 249
 250         /* sanity check */
 251         if (size == 0)
 252                 return -EINVAL;
 253
 254         if (buf[size-1] != '\n')
 255                 return -EINVAL;
 256
 257         fo_path = buf;
 258         if (qword_get(&buf, fo_path, size) < 0)
 259                 return -EINVAL;
 260
 261         error = kern_path(fo_path, 0, &path);
 262         if (error)
 263                 return error;
 264
 265         /*
 266          * XXX: Needs better sanity checking.  Otherwise we could end up
 267          * releasing locks on the wrong file system.
 268          *
 269          * For example:
 270          * 1.  Does the path refer to a directory?
 271          * 2.  Is that directory a mount point, or
 272          * 3.  Is that directory the root of an exported file system?
 273          */
 274         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 275
 276         path_put(&path);
 277         return error;
 278 }
 279
 280 /**
 281  * write_filehandle - Get a variable-length NFS file handle by path
 282  *
 283  * On input, the buffer contains a '\n'-terminated C string comprised of
 284  * three alphanumeric words separated by whitespace.  The string may
 285  * contain escape sequences.
 286  *
 287  * Input:
 288  *                      buf:
 289  *                              domain:         client domain name
 290  *                              path:           export pathname
 291  *                              maxsize:        numeric maximum size of
 292  *                                              @buf
 293  *                      size:   length of C string in @buf
 294  * Output:
 295  *      On success:     passed-in buffer filled with '\n'-terminated C
 296  *                      string containing a ASCII hex text version
 297  *                      of the NFS file handle;
 298  *                      return code is the size in bytes of the string
 299  *      On error:       return code is negative errno value
 300  */
 301 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 302 {
 303         char *dname, *path;
 304         int uninitialized_var(maxsize);
 305         char *mesg = buf;
 306         int len;
 307         struct auth_domain *dom;
 308         struct knfsd_fh fh;
 309
 310         if (size == 0)
 311                 return -EINVAL;
 312
 313         if (buf[size-1] != '\n')
 314                 return -EINVAL;
 315         buf[size-1] = 0;
 316
 317         dname = mesg;
 318         len = qword_get(&mesg, dname, size);
 319         if (len <= 0)
 320                 return -EINVAL;
 321
 322         path = dname+len+1;
 323         len = qword_get(&mesg, path, size);
 324         if (len <= 0)
 325                 return -EINVAL;
 326
 327         len = get_int(&mesg, &maxsize);
 328         if (len)
 329                 return len;
 330
 331         if (maxsize < NFS_FHSIZE)
 332                 return -EINVAL;
 333         if (maxsize > NFS3_FHSIZE)
 334                 maxsize = NFS3_FHSIZE;
 335
 336         if (qword_get(&mesg, mesg, size)>0)
 337                 return -EINVAL;
 338
 339         /* we have all the words, they are in buf.. */
 340         dom = unix_domain_find(dname);
 341         if (!dom)
 342                 return -ENOMEM;
 343
 344         len = exp_rootfh(dom, path, &fh,  maxsize);
 345         auth_domain_put(dom);
 346         if (len)
 347                 return len;
 348
 349         mesg = buf;
 350         len = SIMPLE_TRANSACTION_LIMIT;
 351         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 352         mesg[-1] = '\n';
 353         return mesg - buf;
 354 }
 355
 356 /**
 357  * write_threads - Start NFSD, or report the current number of running threads
 358  *
 359  * Input:
 360  *                      buf:            ignored
 361  *                      size:           zero
 362  * Output:
 363  *      On success:     passed-in buffer filled with '\n'-terminated C
 364  *                      string numeric value representing the number of
 365  *                      running NFSD threads;
 366  *                      return code is the size in bytes of the string
 367  *      On error:       return code is zero
 368  *
 369  * OR
 370  *
 371  * Input:
 372  *                      buf:            C string containing an unsigned
 373  *                                      integer value representing the
 374  *                                      number of NFSD threads to start
 375  *                      size:           non-zero length of C string in @buf
 376  * Output:
 377  *      On success:     NFS service is started;
 378  *                      passed-in buffer filled with '\n'-terminated C
 379  *                      string numeric value representing the number of
 380  *                      running NFSD threads;
 381  *                      return code is the size in bytes of the string
 382  *      On error:       return code is zero or a negative errno value
 383  */
 384 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 385 {
 386         char *mesg = buf;
 387         int rv;
 388         if (size > 0) {
 389                 int newthreads;
 390                 rv = get_int(&mesg, &newthreads);
 391                 if (rv)
 392                         return rv;
 393                 if (newthreads < 0)
 394                         return -EINVAL;
 395                 rv = nfsd_svc(NFS_PORT, newthreads);
 396                 if (rv < 0)
 397                         return rv;
 398         } else
 399                 rv = nfsd_nrthreads();
 400
 401         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 402 }
 403
 404 /**
 405  * write_pool_threads - Set or report the current number of threads per pool
 406  *
 407  * Input:
 408  *                      buf:            ignored
 409  *                      size:           zero
 410  *
 411  * OR
 412  *
 413  * Input:
 414  *                      buf:            C string containing whitespace-
 415  *                                      separated unsigned integer values
 416  *                                      representing the number of NFSD
 417  *                                      threads to start in each pool
 418  *                      size:           non-zero length of C string in @buf
 419  * Output:
 420  *      On success:     passed-in buffer filled with '\n'-terminated C
 421  *                      string containing integer values representing the
 422  *                      number of NFSD threads in each pool;
 423  *                      return code is the size in bytes of the string
 424  *      On error:       return code is zero or a negative errno value
 425  */
 426 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 427 {
 428         /* if size > 0, look for an array of number of threads per node
 429          * and apply them  then write out number of threads per node as reply
 430          */
 431         char *mesg = buf;
 432         int i;
 433         int rv;
 434         int len;
 435         int npools;
 436         int *nthreads;
 437
 438         mutex_lock(&nfsd_mutex);
 439         npools = nfsd_nrpools();
 440         if (npools == 0) {
 441                 /*
 442                  * NFS is shut down.  The admin can start it by
 443                  * writing to the threads file but NOT the pool_threads
 444                  * file, sorry.  Report zero threads.
 445                  */
 446                 mutex_unlock(&nfsd_mutex);
 447                 strcpy(buf, "0\n");
 448                 return strlen(buf);
 449         }
 450
 451         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 452         rv = -ENOMEM;
 453         if (nthreads == NULL)
 454                 goto out_free;
 455
 456         if (size > 0) {
 457                 for (i = 0; i < npools; i++) {
 458                         rv = get_int(&mesg, &nthreads[i]);
 459                         if (rv == -ENOENT)
 460                                 break;          /* fewer numbers than pools */
 461                         if (rv)
 462                                 goto out_free;  /* syntax error */
 463                         rv = -EINVAL;
 464                         if (nthreads[i] < 0)
 465                                 goto out_free;
 466                 }
 467                 rv = nfsd_set_nrthreads(i, nthreads);
 468                 if (rv)
 469                         goto out_free;
 470         }
 471
 472         rv = nfsd_get_nrthreads(npools, nthreads);
 473         if (rv)
 474                 goto out_free;
 475
 476         mesg = buf;
 477         size = SIMPLE_TRANSACTION_LIMIT;
 478         for (i = 0; i < npools && size > 0; i++) {
 479                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 480                 len = strlen(mesg);
 481                 size -= len;
 482                 mesg += len;
 483         }
 484         rv = mesg - buf;
 485 out_free:
 486         kfree(nthreads);
 487         mutex_unlock(&nfsd_mutex);
 488         return rv;
 489 }
 490
 491 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 492 {
 493         char *mesg = buf;
 494         char *vers, *minorp, sign;
 495         int len, num, remaining;
 496         unsigned minor;
 497         ssize_t tlen = 0;
 498         char *sep;
 499
 500         if (size>0) {
 501                 if (nfsd_serv)
 502                         /* Cannot change versions without updating
 503                          * nfsd_serv->sv_xdrsize, and reallocing
 504                          * rq_argp and rq_resp
 505                          */
 506                         return -EBUSY;
 507                 if (buf[size-1] != '\n')
 508                         return -EINVAL;
 509                 buf[size-1] = 0;
 510
 511                 vers = mesg;
 512                 len = qword_get(&mesg, vers, size);
 513                 if (len <= 0) return -EINVAL;
 514                 do {
 515                         sign = *vers;
 516                         if (sign == '+' || sign == '-')
 517                                 num = simple_strtol((vers+1), &minorp, 0);
 518                         else
 519                                 num = simple_strtol(vers, &minorp, 0);
 520                         if (*minorp == '.') {
 521                                 if (num < 4)
 522                                         return -EINVAL;
 523                                 minor = simple_strtoul(minorp+1, NULL, 0);
 524                                 if (minor == 0)
 525                                         return -EINVAL;
 526                                 if (nfsd_minorversion(minor, sign == '-' ?
 527                                                      NFSD_CLEAR : NFSD_SET) < 0)
 528                                         return -EINVAL;
 529                                 goto next;
 530                         }
 531                         switch(num) {
 532                         case 2:
 533                         case 3:
 534                         case 4:
 535                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 536                                 break;
 537                         default:
 538                                 return -EINVAL;
 539                         }
 540                 next:
 541                         vers += len + 1;
 542                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 543                 /* If all get turned off, turn them back on, as
 544                  * having no versions is BAD
 545                  */
 546                 nfsd_reset_versions();
 547         }
 548
 549         /* Now write current state into reply buffer */
 550         len = 0;
 551         sep = "";
 552         remaining = SIMPLE_TRANSACTION_LIMIT;
 553         for (num=2 ; num <= 4 ; num++)
 554                 if (nfsd_vers(num, NFSD_AVAIL)) {
 555                         len = snprintf(buf, remaining, "%s%c%d", sep,
 556                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 557                                        num);
 558                         sep = " ";
 559
 560                         if (len > remaining)
 561                                 break;
 562                         remaining -= len;
 563                         buf += len;
 564                         tlen += len;
 565                 }
 566         if (nfsd_vers(4, NFSD_AVAIL))
 567                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 568                      minor++) {
 569                         len = snprintf(buf, remaining, " %c4.%u",
 570                                         (nfsd_vers(4, NFSD_TEST) &&
 571                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 572                                                 '+' : '-',
 573                                         minor);
 574
 575                         if (len > remaining)
 576                                 break;
 577                         remaining -= len;
 578                         buf += len;
 579                         tlen += len;
 580                 }
 581
 582         len = snprintf(buf, remaining, "\n");
 583         if (len > remaining)
 584                 return -EINVAL;
 585         return tlen + len;
 586 }
 587
 588 /**
 589  * write_versions - Set or report the available NFS protocol versions
 590  *
 591  * Input:
 592  *                      buf:            ignored
 593  *                      size:           zero
 594  * Output:
 595  *      On success:     passed-in buffer filled with '\n'-terminated C
 596  *                      string containing positive or negative integer
 597  *                      values representing the current status of each
 598  *                      protocol version;
 599  *                      return code is the size in bytes of the string
 600  *      On error:       return code is zero or a negative errno value
 601  *
 602  * OR
 603  *
 604  * Input:
 605  *                      buf:            C string containing whitespace-
 606  *                                      separated positive or negative
 607  *                                      integer values representing NFS
 608  *                                      protocol versions to enable ("+n")
 609  *                                      or disable ("-n")
 610  *                      size:           non-zero length of C string in @buf
 611  * Output:
 612  *      On success:     status of zero or more protocol versions has
 613  *                      been updated; passed-in buffer filled with
 614  *                      '\n'-terminated C string containing positive
 615  *                      or negative integer values representing the
 616  *                      current status of each protocol version;
 617  *                      return code is the size in bytes of the string
 618  *      On error:       return code is zero or a negative errno value
 619  */
 620 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 621 {
 622         ssize_t rv;
 623
 624         mutex_lock(&nfsd_mutex);
 625         rv = __write_versions(file, buf, size);
 626         mutex_unlock(&nfsd_mutex);
 627         return rv;
 628 }
 629
 630 /*
 631  * Zero-length write.  Return a list of NFSD's current listener
 632  * transports.
 633  */
 634 static ssize_t __write_ports_names(char *buf)
 635 {
 636         if (nfsd_serv == NULL)
 637                 return 0;
 638         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 639 }
 640
 641 /*
 642  * A single 'fd' number was written, in which case it must be for
 643  * a socket of a supported family/protocol, and we use it as an
 644  * nfsd listener.
 645  */
 646 static ssize_t __write_ports_addfd(char *buf)
 647 {
 648         char *mesg = buf;
 649         int fd, err;
 650
 651         err = get_int(&mesg, &fd);
 652         if (err != 0 || fd < 0)
 653                 return -EINVAL;
 654
 655         err = nfsd_create_serv();
 656         if (err != 0)
 657                 return err;
 658
 659         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 660         if (err < 0) {
 661                 svc_destroy(nfsd_serv);
 662                 return err;
 663         }
 664
 665         /* Decrease the count, but don't shut down the service */
 666         nfsd_serv->sv_nrthreads--;
 667         return err;
 668 }
 669
 670 /*
 671  * A '-' followed by the 'name' of a socket means we close the socket.
 672  */
 673 static ssize_t __write_ports_delfd(char *buf)
 674 {
 675         char *toclose;
 676         int len = 0;
 677
 678         toclose = kstrdup(buf + 1, GFP_KERNEL);
 679         if (toclose == NULL)
 680                 return -ENOMEM;
 681
 682         if (nfsd_serv != NULL)
 683                 len = svc_sock_names(nfsd_serv, buf,
 684                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 685         kfree(toclose);
 686         return len;
 687 }
 688
 689 /*
 690  * A transport listener is added by writing it's transport name and
 691  * a port number.
 692  */
 693 static ssize_t __write_ports_addxprt(char *buf)
 694 {
 695         char transport[16];
 696         struct svc_xprt *xprt;
 697         int port, err;
 698
 699         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 700                 return -EINVAL;
 701
 702         if (port < 1 || port > USHRT_MAX)
 703                 return -EINVAL;
 704
 705         err = nfsd_create_serv();
 706         if (err != 0)
 707                 return err;
 708
 709         err = svc_create_xprt(nfsd_serv, transport, &init_net,
 710                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 711         if (err < 0)
 712                 goto out_err;
 713
 714         err = svc_create_xprt(nfsd_serv, transport, &init_net,
 715                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
 716         if (err < 0 && err != -EAFNOSUPPORT)
 717                 goto out_close;
 718
 719         /* Decrease the count, but don't shut down the service */
 720         nfsd_serv->sv_nrthreads--;
 721         return 0;
 722 out_close:
 723         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
 724         if (xprt != NULL) {
 725                 svc_close_xprt(xprt);
 726                 svc_xprt_put(xprt);
 727         }
 728 out_err:
 729         svc_destroy(nfsd_serv);
 730         return err;
 731 }
 732
 733 /*
 734  * A transport listener is removed by writing a "-", it's transport
 735  * name, and it's port number.
 736  */
 737 static ssize_t __write_ports_delxprt(char *buf)
 738 {
 739         struct svc_xprt *xprt;
 740         char transport[16];
 741         int port;
 742
 743         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
 744                 return -EINVAL;
 745
 746         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
 747                 return -EINVAL;
 748
 749         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
 750         if (xprt == NULL)
 751                 return -ENOTCONN;
 752
 753         svc_close_xprt(xprt);
 754         svc_xprt_put(xprt);
 755         return 0;
 756 }
 757
 758 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 759 {
 760         if (size == 0)
 761                 return __write_ports_names(buf);
 762
 763         if (isdigit(buf[0]))
 764                 return __write_ports_addfd(buf);
 765
 766         if (buf[0] == '-' && isdigit(buf[1]))
 767                 return __write_ports_delfd(buf);
 768
 769         if (isalpha(buf[0]))
 770                 return __write_ports_addxprt(buf);
 771
 772         if (buf[0] == '-' && isalpha(buf[1]))
 773                 return __write_ports_delxprt(buf);
 774
 775         return -EINVAL;
 776 }
 777
 778 /**
 779  * write_ports - Pass a socket file descriptor or transport name to listen on
 780  *
 781  * Input:
 782  *                      buf:            ignored
 783  *                      size:           zero
 784  * Output:
 785  *      On success:     passed-in buffer filled with a '\n'-terminated C
 786  *                      string containing a whitespace-separated list of
 787  *                      named NFSD listeners;
 788  *                      return code is the size in bytes of the string
 789  *      On error:       return code is zero or a negative errno value
 790  *
 791  * OR
 792  *
 793  * Input:
 794  *                      buf:            C string containing an unsigned
 795  *                                      integer value representing a bound
 796  *                                      but unconnected socket that is to be
 797  *                                      used as an NFSD listener; listen(3)
 798  *                                      must be called for a SOCK_STREAM
 799  *                                      socket, otherwise it is ignored
 800  *                      size:           non-zero length of C string in @buf
 801  * Output:
 802  *      On success:     NFS service is started;
 803  *                      passed-in buffer filled with a '\n'-terminated C
 804  *                      string containing a unique alphanumeric name of
 805  *                      the listener;
 806  *                      return code is the size in bytes of the string
 807  *      On error:       return code is a negative errno value
 808  *
 809  * OR
 810  *
 811  * Input:
 812  *                      buf:            C string containing a "-" followed
 813  *                                      by an integer value representing a
 814  *                                      previously passed in socket file
 815  *                                      descriptor
 816  *                      size:           non-zero length of C string in @buf
 817  * Output:
 818  *      On success:     NFS service no longer listens on that socket;
 819  *                      passed-in buffer filled with a '\n'-terminated C
 820  *                      string containing a unique name of the listener;
 821  *                      return code is the size in bytes of the string
 822  *      On error:       return code is a negative errno value
 823  *
 824  * OR
 825  *
 826  * Input:
 827  *                      buf:            C string containing a transport
 828  *                                      name and an unsigned integer value
 829  *                                      representing the port to listen on,
 830  *                                      separated by whitespace
 831  *                      size:           non-zero length of C string in @buf
 832  * Output:
 833  *      On success:     returns zero; NFS service is started
 834  *      On error:       return code is a negative errno value
 835  *
 836  * OR
 837  *
 838  * Input:
 839  *                      buf:            C string containing a "-" followed
 840  *                                      by a transport name and an unsigned
 841  *                                      integer value representing the port
 842  *                                      to listen on, separated by whitespace
 843  *                      size:           non-zero length of C string in @buf
 844  * Output:
 845  *      On success:     returns zero; NFS service no longer listens
 846  *                      on that transport
 847  *      On error:       return code is a negative errno value
 848  */
 849 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 850 {
 851         ssize_t rv;
 852
 853         mutex_lock(&nfsd_mutex);
 854         rv = __write_ports(file, buf, size);
 855         mutex_unlock(&nfsd_mutex);
 856         return rv;
 857 }
 858
 859
 860 int nfsd_max_blksize;
 861
 862 /**
 863  * write_maxblksize - Set or report the current NFS blksize
 864  *
 865  * Input:
 866  *                      buf:            ignored
 867  *                      size:           zero
 868  *
 869  * OR
 870  *
 871  * Input:
 872  *                      buf:            C string containing an unsigned
 873  *                                      integer value representing the new
 874  *                                      NFS blksize
 875  *                      size:           non-zero length of C string in @buf
 876  * Output:
 877  *      On success:     passed-in buffer filled with '\n'-terminated C string
 878  *                      containing numeric value of the current NFS blksize
 879  *                      setting;
 880  *                      return code is the size in bytes of the string
 881  *      On error:       return code is zero or a negative errno value
 882  */
 883 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 884 {
 885         char *mesg = buf;
 886         if (size > 0) {
 887                 int bsize;
 888                 int rv = get_int(&mesg, &bsize);
 889                 if (rv)
 890                         return rv;
 891                 /* force bsize into allowed range and
 892                  * required alignment.
 893                  */
 894                 if (bsize < 1024)
 895                         bsize = 1024;
 896                 if (bsize > NFSSVC_MAXBLKSIZE)
 897                         bsize = NFSSVC_MAXBLKSIZE;
 898                 bsize &= ~(1024-1);
 899                 mutex_lock(&nfsd_mutex);
 900                 if (nfsd_serv) {
 901                         mutex_unlock(&nfsd_mutex);
 902                         return -EBUSY;
 903                 }
 904                 nfsd_max_blksize = bsize;
 905                 mutex_unlock(&nfsd_mutex);
 906         }
 907
 908         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 909                                                         nfsd_max_blksize);
 910 }
 911
 912 #ifdef CONFIG_NFSD_V4
 913 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 914 {
 915         char *mesg = buf;
 916         int rv, i;
 917
 918         if (size > 0) {
 919                 if (nfsd_serv)
 920                         return -EBUSY;
 921                 rv = get_int(&mesg, &i);
 922                 if (rv)
 923                         return rv;
 924                 /*
 925                  * Some sanity checking.  We don't have a reason for
 926                  * these particular numbers, but problems with the
 927                  * extremes are:
 928                  *      - Too short: the briefest network outage may
 929                  *        cause clients to lose all their locks.  Also,
 930                  *        the frequent polling may be wasteful.
 931                  *      - Too long: do you really want reboot recovery
 932                  *        to take more than an hour?  Or to make other
 933                  *        clients wait an hour before being able to
 934                  *        revoke a dead client's locks?
 935                  */
 936                 if (i < 10 || i > 3600)
 937                         return -EINVAL;
 938                 *time = i;
 939         }
 940
 941         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 942 }
 943
 944 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 945 {
 946         ssize_t rv;
 947
 948         mutex_lock(&nfsd_mutex);
 949         rv = __nfsd4_write_time(file, buf, size, time);
 950         mutex_unlock(&nfsd_mutex);
 951         return rv;
 952 }
 953
 954 /**
 955  * write_leasetime - Set or report the current NFSv4 lease time
 956  *
 957  * Input:
 958  *                      buf:            ignored
 959  *                      size:           zero
 960  *
 961  * OR
 962  *
 963  * Input:
 964  *                      buf:            C string containing an unsigned
 965  *                                      integer value representing the new
 966  *                                      NFSv4 lease expiry time
 967  *                      size:           non-zero length of C string in @buf
 968  * Output:
 969  *      On success:     passed-in buffer filled with '\n'-terminated C
 970  *                      string containing unsigned integer value of the
 971  *                      current lease expiry time;
 972  *                      return code is the size in bytes of the string
 973  *      On error:       return code is zero or a negative errno value
 974  */
 975 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 976 {
 977         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
 978 }
 979
 980 /**
 981  * write_gracetime - Set or report current NFSv4 grace period time
 982  *
 983  * As above, but sets the time of the NFSv4 grace period.
 984  *
 985  * Note this should never be set to less than the *previous*
 986  * lease-period time, but we don't try to enforce this.  (In the common
 987  * case (a new boot), we don't know what the previous lease time was
 988  * anyway.)
 989  */
 990 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
 991 {
 992         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
 993 }
 994
 995 extern char *nfs4_recoverydir(void);
 996
 997 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
 998 {
 999         char *mesg = buf;
1000         char *recdir;
1001         int len, status;
1002
1003         if (size > 0) {
1004                 if (nfsd_serv)
1005                         return -EBUSY;
1006                 if (size > PATH_MAX || buf[size-1] != '\n')
1007                         return -EINVAL;
1008                 buf[size-1] = 0;
1009
1010                 recdir = mesg;
1011                 len = qword_get(&mesg, recdir, size);
1012                 if (len <= 0)
1013                         return -EINVAL;
1014
1015                 status = nfs4_reset_recoverydir(recdir);
1016                 if (status)
1017                         return status;
1018         }
1019
1020         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1021                                                         nfs4_recoverydir());
1022 }
1023
1024 /**
1025  * write_recoverydir - Set or report the pathname of the recovery directory
1026  *
1027  * Input:
1028  *                      buf:            ignored
1029  *                      size:           zero
1030  *
1031  * OR
1032  *
1033  * Input:
1034  *                      buf:            C string containing the pathname
1035  *                                      of the directory on a local file
1036  *                                      system containing permanent NFSv4
1037  *                                      recovery data
1038  *                      size:           non-zero length of C string in @buf
1039  * Output:
1040  *      On success:     passed-in buffer filled with '\n'-terminated C string
1041  *                      containing the current recovery pathname setting;
1042  *                      return code is the size in bytes of the string
1043  *      On error:       return code is zero or a negative errno value
1044  */
1045 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1046 {
1047         ssize_t rv;
1048
1049         mutex_lock(&nfsd_mutex);
1050         rv = __write_recoverydir(file, buf, size);
1051         mutex_unlock(&nfsd_mutex);
1052         return rv;
1053 }
1054
1055 #endif
1056
1057 /*----------------------------------------------------------------------------*/
1058 /*
1059  *      populating the filesystem.
1060  */
1061
1062 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1063 {
1064         static struct tree_descr nfsd_files[] = {
1065                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1066                 [NFSD_Export_features] = {"export_features",
1067                                         &export_features_operations, S_IRUGO},
1068                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1069                                         &transaction_ops, S_IWUSR|S_IRUSR},
1070                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1071                                         &transaction_ops, S_IWUSR|S_IRUSR},
1072                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1073                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1074                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1075                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1076                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1077                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1078                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1079 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1080                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1081 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1082 #ifdef CONFIG_NFSD_V4
1083                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1084                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1085                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1086 #endif
1087                 /* last one */ {""}
1088         };
1089         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1090 }
1091
1092 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1093         int flags, const char *dev_name, void *data)
1094 {
1095         return mount_single(fs_type, flags, data, nfsd_fill_super);
1096 }
1097
1098 static struct file_system_type nfsd_fs_type = {
1099         .owner          = THIS_MODULE,
1100         .name           = "nfsd",
1101         .mount          = nfsd_mount,
1102         .kill_sb        = kill_litter_super,
1103 };
1104
1105 #ifdef CONFIG_PROC_FS
1106 static int create_proc_exports_entry(void)
1107 {
1108         struct proc_dir_entry *entry;
1109
1110         entry = proc_mkdir("fs/nfs", NULL);
1111         if (!entry)
1112                 return -ENOMEM;
1113         entry = proc_create("exports", 0, entry, &exports_operations);
1114         if (!entry)
1115                 return -ENOMEM;
1116         return 0;
1117 }
1118 #else /* CONFIG_PROC_FS */
1119 static int create_proc_exports_entry(void)
1120 {
1121         return 0;
1122 }
1123 #endif
1124
1125 static int __init init_nfsd(void)
1126 {
1127         int retval;
1128         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1129
1130         retval = nfs4_state_init(); /* nfs4 locking state */
1131         if (retval)
1132                 return retval;
1133         nfsd_stat_init();       /* Statistics */
1134         retval = nfsd_reply_cache_init();
1135         if (retval)
1136                 goto out_free_stat;
1137         retval = nfsd_export_init();
1138         if (retval)
1139                 goto out_free_cache;
1140         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1141         retval = nfsd_idmap_init();
1142         if (retval)
1143                 goto out_free_lockd;
1144         retval = create_proc_exports_entry();
1145         if (retval)
1146                 goto out_free_idmap;
1147         retval = register_filesystem(&nfsd_fs_type);
1148         if (retval)
1149                 goto out_free_all;
1150         return 0;
1151 out_free_all:
1152         remove_proc_entry("fs/nfs/exports", NULL);
1153         remove_proc_entry("fs/nfs", NULL);
1154 out_free_idmap:
1155         nfsd_idmap_shutdown();
1156 out_free_lockd:
1157         nfsd_lockd_shutdown();
1158         nfsd_export_shutdown();
1159 out_free_cache:
1160         nfsd_reply_cache_shutdown();
1161 out_free_stat:
1162         nfsd_stat_shutdown();
1163         nfsd4_free_slabs();
1164         return retval;
1165 }
1166
1167 static void __exit exit_nfsd(void)
1168 {
1169         nfsd_export_shutdown();
1170         nfsd_reply_cache_shutdown();
1171         remove_proc_entry("fs/nfs/exports", NULL);
1172         remove_proc_entry("fs/nfs", NULL);
1173         nfsd_stat_shutdown();
1174         nfsd_lockd_shutdown();
1175         nfsd_idmap_shutdown();
1176         nfsd4_free_slabs();
1177         unregister_filesystem(&nfsd_fs_type);
1178 }
1179
1180 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1181 MODULE_LICENSE("GPL");
1182 module_init(init_nfsd)
1183 module_exit(exit_nfsd)