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/nfsd/syscall.h>
  13 #include <linux/lockd/lockd.h>
  14 #include <linux/sunrpc/clnt.h>
  15 #include <linux/sunrpc/gss_api.h>
  16 #include <linux/sunrpc/gss_krb5_enctypes.h>
  17
  18 #include "idmap.h"
  19 #include "nfsd.h"
  20 #include "cache.h"
  21
  22 /*
  23  *      We have a single directory with several nodes in it.
  24  */
  25 enum {
  26         NFSD_Root = 1,
  27         NFSD_List,
  28         NFSD_Export_features,
  29         NFSD_Fh,
  30         NFSD_FO_UnlockIP,
  31         NFSD_FO_UnlockFS,
  32         NFSD_Threads,
  33         NFSD_Pool_Threads,
  34         NFSD_Pool_Stats,
  35         NFSD_Versions,
  36         NFSD_Ports,
  37         NFSD_MaxBlkSize,
  38         NFSD_SupportedEnctypes,
  39         /*
  40          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  41          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  42          */
  43 #ifdef CONFIG_NFSD_V4
  44         NFSD_Leasetime,
  45         NFSD_Gracetime,
  46         NFSD_RecoveryDir,
  47 #endif
  48 };
  49
  50 /*
  51  * write() for these nodes.
  52  */
  53 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  54 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  55 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  56 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  57 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  58 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  59 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  60 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  61 #ifdef CONFIG_NFSD_V4
  62 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  63 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  64 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  65 #endif
  66
  67 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  68         [NFSD_Fh] = write_filehandle,
  69         [NFSD_FO_UnlockIP] = write_unlock_ip,
  70         [NFSD_FO_UnlockFS] = write_unlock_fs,
  71         [NFSD_Threads] = write_threads,
  72         [NFSD_Pool_Threads] = write_pool_threads,
  73         [NFSD_Versions] = write_versions,
  74         [NFSD_Ports] = write_ports,
  75         [NFSD_MaxBlkSize] = write_maxblksize,
  76 #ifdef CONFIG_NFSD_V4
  77         [NFSD_Leasetime] = write_leasetime,
  78         [NFSD_Gracetime] = write_gracetime,
  79         [NFSD_RecoveryDir] = write_recoverydir,
  80 #endif
  81 };
  82
  83 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  84 {
  85         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
  86         char *data;
  87         ssize_t rv;
  88
  89         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
  90                 return -EINVAL;
  91
  92         data = simple_transaction_get(file, buf, size);
  93         if (IS_ERR(data))
  94                 return PTR_ERR(data);
  95
  96         rv =  write_op[ino](file, data, size);
  97         if (rv >= 0) {
  98                 simple_transaction_set(file, rv);
  99                 rv = size;
 100         }
 101         return rv;
 102 }
 103
 104 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 105 {
 106         if (! file->private_data) {
 107                 /* An attempt to read a transaction file without writing
 108                  * causes a 0-byte write so that the file can return
 109                  * state information
 110                  */
 111                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 112                 if (rv < 0)
 113                         return rv;
 114         }
 115         return simple_transaction_read(file, buf, size, pos);
 116 }
 117
 118 static const struct file_operations transaction_ops = {
 119         .write          = nfsctl_transaction_write,
 120         .read           = nfsctl_transaction_read,
 121         .release        = simple_transaction_release,
 122         .llseek         = default_llseek,
 123 };
 124
 125 static int exports_open(struct inode *inode, struct file *file)
 126 {
 127         return seq_open(file, &nfs_exports_op);
 128 }
 129
 130 static const struct file_operations exports_operations = {
 131         .open           = exports_open,
 132         .read           = seq_read,
 133         .llseek         = seq_lseek,
 134         .release        = seq_release,
 135         .owner          = THIS_MODULE,
 136 };
 137
 138 static int export_features_show(struct seq_file *m, void *v)
 139 {
 140         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 141         return 0;
 142 }
 143
 144 static int export_features_open(struct inode *inode, struct file *file)
 145 {
 146         return single_open(file, export_features_show, NULL);
 147 }
 148
 149 static struct file_operations export_features_operations = {
 150         .open           = export_features_open,
 151         .read           = seq_read,
 152         .llseek         = seq_lseek,
 153         .release        = single_release,
 154 };
 155
 156 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 157 static int supported_enctypes_show(struct seq_file *m, void *v)
 158 {
 159         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 160         return 0;
 161 }
 162
 163 static int supported_enctypes_open(struct inode *inode, struct file *file)
 164 {
 165         return single_open(file, supported_enctypes_show, NULL);
 166 }
 167
 168 static struct file_operations supported_enctypes_ops = {
 169         .open           = supported_enctypes_open,
 170         .read           = seq_read,
 171         .llseek         = seq_lseek,
 172         .release        = single_release,
 173 };
 174 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 175
 176 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 177 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 178
 179 static const struct file_operations pool_stats_operations = {
 180         .open           = nfsd_pool_stats_open,
 181         .read           = seq_read,
 182         .llseek         = seq_lseek,
 183         .release        = nfsd_pool_stats_release,
 184         .owner          = THIS_MODULE,
 185 };
 186
 187 /*----------------------------------------------------------------------------*/
 188 /*
 189  * payload - write methods
 190  */
 191
 192
 193 /**
 194  * write_unlock_ip - Release all locks used by a client
 195  *
 196  * Experimental.
 197  *
 198  * Input:
 199  *                      buf:    '\n'-terminated C string containing a
 200  *                              presentation format IP address
 201  *                      size:   length of C string in @buf
 202  * Output:
 203  *      On success:     returns zero if all specified locks were released;
 204  *                      returns one if one or more locks were not released
 205  *      On error:       return code is negative errno value
 206  */
 207 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 208 {
 209         struct sockaddr_storage address;
 210         struct sockaddr *sap = (struct sockaddr *)&address;
 211         size_t salen = sizeof(address);
 212         char *fo_path;
 213
 214         /* sanity check */
 215         if (size == 0)
 216                 return -EINVAL;
 217
 218         if (buf[size-1] != '\n')
 219                 return -EINVAL;
 220
 221         fo_path = buf;
 222         if (qword_get(&buf, fo_path, size) < 0)
 223                 return -EINVAL;
 224
 225         if (rpc_pton(fo_path, size, sap, salen) == 0)
 226                 return -EINVAL;
 227
 228         return nlmsvc_unlock_all_by_ip(sap);
 229 }
 230
 231 /**
 232  * write_unlock_fs - Release all locks on a local file system
 233  *
 234  * Experimental.
 235  *
 236  * Input:
 237  *                      buf:    '\n'-terminated C string containing the
 238  *                              absolute pathname of a local file system
 239  *                      size:   length of C string in @buf
 240  * Output:
 241  *      On success:     returns zero if all specified locks were released;
 242  *                      returns one if one or more locks were not released
 243  *      On error:       return code is negative errno value
 244  */
 245 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 246 {
 247         struct path path;
 248         char *fo_path;
 249         int error;
 250
 251         /* sanity check */
 252         if (size == 0)
 253                 return -EINVAL;
 254
 255         if (buf[size-1] != '\n')
 256                 return -EINVAL;
 257
 258         fo_path = buf;
 259         if (qword_get(&buf, fo_path, size) < 0)
 260                 return -EINVAL;
 261
 262         error = kern_path(fo_path, 0, &path);
 263         if (error)
 264                 return error;
 265
 266         /*
 267          * XXX: Needs better sanity checking.  Otherwise we could end up
 268          * releasing locks on the wrong file system.
 269          *
 270          * For example:
 271          * 1.  Does the path refer to a directory?
 272          * 2.  Is that directory a mount point, or
 273          * 3.  Is that directory the root of an exported file system?
 274          */
 275         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
 276
 277         path_put(&path);
 278         return error;
 279 }
 280
 281 /**
 282  * write_filehandle - Get a variable-length NFS file handle by path
 283  *
 284  * On input, the buffer contains a '\n'-terminated C string comprised of
 285  * three alphanumeric words separated by whitespace.  The string may
 286  * contain escape sequences.
 287  *
 288  * Input:
 289  *                      buf:
 290  *                              domain:         client domain name
 291  *                              path:           export pathname
 292  *                              maxsize:        numeric maximum size of
 293  *                                              @buf
 294  *                      size:   length of C string in @buf
 295  * Output:
 296  *      On success:     passed-in buffer filled with '\n'-terminated C
 297  *                      string containing a ASCII hex text version
 298  *                      of the NFS file handle;
 299  *                      return code is the size in bytes of the string
 300  *      On error:       return code is negative errno value
 301  */
 302 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 303 {
 304         char *dname, *path;
 305         int uninitialized_var(maxsize);
 306         char *mesg = buf;
 307         int len;
 308         struct auth_domain *dom;
 309         struct knfsd_fh fh;
 310
 311         if (size == 0)
 312                 return -EINVAL;
 313
 314         if (buf[size-1] != '\n')
 315                 return -EINVAL;
 316         buf[size-1] = 0;
 317
 318         dname = mesg;
 319         len = qword_get(&mesg, dname, size);
 320         if (len <= 0)
 321                 return -EINVAL;
 322
 323         path = dname+len+1;
 324         len = qword_get(&mesg, path, size);
 325         if (len <= 0)
 326                 return -EINVAL;
 327
 328         len = get_int(&mesg, &maxsize);
 329         if (len)
 330                 return len;
 331
 332         if (maxsize < NFS_FHSIZE)
 333                 return -EINVAL;
 334         if (maxsize > NFS3_FHSIZE)
 335                 maxsize = NFS3_FHSIZE;
 336
 337         if (qword_get(&mesg, mesg, size)>0)
 338                 return -EINVAL;
 339
 340         /* we have all the words, they are in buf.. */
 341         dom = unix_domain_find(dname);
 342         if (!dom)
 343                 return -ENOMEM;
 344
 345         len = exp_rootfh(dom, path, &fh,  maxsize);
 346         auth_domain_put(dom);
 347         if (len)
 348                 return len;
 349
 350         mesg = buf;
 351         len = SIMPLE_TRANSACTION_LIMIT;
 352         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 353         mesg[-1] = '\n';
 354         return mesg - buf;
 355 }
 356
 357 /**
 358  * write_threads - Start NFSD, or report the current number of running threads
 359  *
 360  * Input:
 361  *                      buf:            ignored
 362  *                      size:           zero
 363  * Output:
 364  *      On success:     passed-in buffer filled with '\n'-terminated C
 365  *                      string numeric value representing the number of
 366  *                      running NFSD threads;
 367  *                      return code is the size in bytes of the string
 368  *      On error:       return code is zero
 369  *
 370  * OR
 371  *
 372  * Input:
 373  *                      buf:            C string containing an unsigned
 374  *                                      integer value representing the
 375  *                                      number of NFSD threads to start
 376  *                      size:           non-zero length of C string in @buf
 377  * Output:
 378  *      On success:     NFS service is started;
 379  *                      passed-in buffer filled with '\n'-terminated C
 380  *                      string numeric value representing the number of
 381  *                      running NFSD threads;
 382  *                      return code is the size in bytes of the string
 383  *      On error:       return code is zero or a negative errno value
 384  */
 385 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 386 {
 387         char *mesg = buf;
 388         int rv;
 389         if (size > 0) {
 390                 int newthreads;
 391                 rv = get_int(&mesg, &newthreads);
 392                 if (rv)
 393                         return rv;
 394                 if (newthreads < 0)
 395                         return -EINVAL;
 396                 rv = nfsd_svc(NFS_PORT, newthreads);
 397                 if (rv < 0)
 398                         return rv;
 399         } else
 400                 rv = nfsd_nrthreads();
 401
 402         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 403 }
 404
 405 /**
 406  * write_pool_threads - Set or report the current number of threads per pool
 407  *
 408  * Input:
 409  *                      buf:            ignored
 410  *                      size:           zero
 411  *
 412  * OR
 413  *
 414  * Input:
 415  *                      buf:            C string containing whitespace-
 416  *                                      separated unsigned integer values
 417  *                                      representing the number of NFSD
 418  *                                      threads to start in each pool
 419  *                      size:           non-zero length of C string in @buf
 420  * Output:
 421  *      On success:     passed-in buffer filled with '\n'-terminated C
 422  *                      string containing integer values representing the
 423  *                      number of NFSD threads in each pool;
 424  *                      return code is the size in bytes of the string
 425  *      On error:       return code is zero or a negative errno value
 426  */
 427 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 428 {
 429         /* if size > 0, look for an array of number of threads per node
 430          * and apply them  then write out number of threads per node as reply
 431          */
 432         char *mesg = buf;
 433         int i;
 434         int rv;
 435         int len;
 436         int npools;
 437         int *nthreads;
 438
 439         mutex_lock(&nfsd_mutex);
 440         npools = nfsd_nrpools();
 441         if (npools == 0) {
 442                 /*
 443                  * NFS is shut down.  The admin can start it by
 444                  * writing to the threads file but NOT the pool_threads
 445                  * file, sorry.  Report zero threads.
 446                  */
 447                 mutex_unlock(&nfsd_mutex);
 448                 strcpy(buf, "0\n");
 449                 return strlen(buf);
 450         }
 451
 452         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 453         rv = -ENOMEM;
 454         if (nthreads == NULL)
 455                 goto out_free;
 456
 457         if (size > 0) {
 458                 for (i = 0; i < npools; i++) {
 459                         rv = get_int(&mesg, &nthreads[i]);
 460                         if (rv == -ENOENT)
 461                                 break;          /* fewer numbers than pools */
 462                         if (rv)
 463                                 goto out_free;  /* syntax error */
 464                         rv = -EINVAL;
 465                         if (nthreads[i] < 0)
 466                                 goto out_free;
 467                 }
 468                 rv = nfsd_set_nrthreads(i, nthreads);
 469                 if (rv)
 470                         goto out_free;
 471         }
 472
 473         rv = nfsd_get_nrthreads(npools, nthreads);
 474         if (rv)
 475                 goto out_free;
 476
 477         mesg = buf;
 478         size = SIMPLE_TRANSACTION_LIMIT;
 479         for (i = 0; i < npools && size > 0; i++) {
 480                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 481                 len = strlen(mesg);
 482                 size -= len;
 483                 mesg += len;
 484         }
 485         rv = mesg - buf;
 486 out_free:
 487         kfree(nthreads);
 488         mutex_unlock(&nfsd_mutex);
 489         return rv;
 490 }
 491
 492 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 493 {
 494         char *mesg = buf;
 495         char *vers, *minorp, sign;
 496         int len, num, remaining;
 497         unsigned minor;
 498         ssize_t tlen = 0;
 499         char *sep;
 500
 501         if (size>0) {
 502                 if (nfsd_serv)
 503                         /* Cannot change versions without updating
 504                          * nfsd_serv->sv_xdrsize, and reallocing
 505                          * rq_argp and rq_resp
 506                          */
 507                         return -EBUSY;
 508                 if (buf[size-1] != '\n')
 509                         return -EINVAL;
 510                 buf[size-1] = 0;
 511
 512                 vers = mesg;
 513                 len = qword_get(&mesg, vers, size);
 514                 if (len <= 0) return -EINVAL;
 515                 do {
 516                         sign = *vers;
 517                         if (sign == '+' || sign == '-')
 518                                 num = simple_strtol((vers+1), &minorp, 0);
 519                         else
 520                                 num = simple_strtol(vers, &minorp, 0);
 521                         if (*minorp == '.') {
 522                                 if (num < 4)
 523                                         return -EINVAL;
 524                                 minor = simple_strtoul(minorp+1, NULL, 0);
 525                                 if (minor == 0)
 526                                         return -EINVAL;
 527                                 if (nfsd_minorversion(minor, sign == '-' ?
 528                                                      NFSD_CLEAR : NFSD_SET) < 0)
 529                                         return -EINVAL;
 530                                 goto next;
 531                         }
 532                         switch(num) {
 533                         case 2:
 534                         case 3:
 535                         case 4:
 536                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 537                                 break;
 538                         default:
 539                                 return -EINVAL;
 540                         }
 541                 next:
 542                         vers += len + 1;
 543                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 544                 /* If all get turned off, turn them back on, as
 545                  * having no versions is BAD
 546                  */
 547                 nfsd_reset_versions();
 548         }
 549
 550         /* Now write current state into reply buffer */
 551         len = 0;
 552         sep = "";
 553         remaining = SIMPLE_TRANSACTION_LIMIT;
 554         for (num=2 ; num <= 4 ; num++)
 555                 if (nfsd_vers(num, NFSD_AVAIL)) {
 556                         len = snprintf(buf, remaining, "%s%c%d", sep,
 557                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 558                                        num);
 559                         sep = " ";
 560
 561                         if (len > remaining)
 562                                 break;
 563                         remaining -= len;
 564                         buf += len;
 565                         tlen += len;
 566                 }
 567         if (nfsd_vers(4, NFSD_AVAIL))
 568                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 569                      minor++) {
 570                         len = snprintf(buf, remaining, " %c4.%u",
 571                                         (nfsd_vers(4, NFSD_TEST) &&
 572                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 573                                                 '+' : '-',
 574                                         minor);
 575
 576                         if (len > remaining)
 577                                 break;
 578                         remaining -= len;
 579                         buf += len;
 580                         tlen += len;
 581                 }
 582
 583         len = snprintf(buf, remaining, "\n");
 584         if (len > remaining)
 585                 return -EINVAL;
 586         return tlen + len;
 587 }
 588
 589 /**
 590  * write_versions - Set or report the available NFS protocol versions
 591  *
 592  * Input:
 593  *                      buf:            ignored
 594  *                      size:           zero
 595  * Output:
 596  *      On success:     passed-in buffer filled with '\n'-terminated C
 597  *                      string containing positive or negative integer
 598  *                      values representing the current status of each
 599  *                      protocol version;
 600  *                      return code is the size in bytes of the string
 601  *      On error:       return code is zero or a negative errno value
 602  *
 603  * OR
 604  *
 605  * Input:
 606  *                      buf:            C string containing whitespace-
 607  *                                      separated positive or negative
 608  *                                      integer values representing NFS
 609  *                                      protocol versions to enable ("+n")
 610  *                                      or disable ("-n")
 611  *                      size:           non-zero length of C string in @buf
 612  * Output:
 613  *      On success:     status of zero or more protocol versions has
 614  *                      been updated; passed-in buffer filled with
 615  *                      '\n'-terminated C string containing positive
 616  *                      or negative integer values representing the
 617  *                      current status of each protocol version;
 618  *                      return code is the size in bytes of the string
 619  *      On error:       return code is zero or a negative errno value
 620  */
 621 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 622 {
 623         ssize_t rv;
 624
 625         mutex_lock(&nfsd_mutex);
 626         rv = __write_versions(file, buf, size);
 627         mutex_unlock(&nfsd_mutex);
 628         return rv;
 629 }
 630
 631 /*
 632  * Zero-length write.  Return a list of NFSD's current listener
 633  * transports.
 634  */
 635 static ssize_t __write_ports_names(char *buf)
 636 {
 637         if (nfsd_serv == NULL)
 638                 return 0;
 639         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 640 }
 641
 642 /*
 643  * A single 'fd' number was written, in which case it must be for
 644  * a socket of a supported family/protocol, and we use it as an
 645  * nfsd listener.
 646  */
 647 static ssize_t __write_ports_addfd(char *buf)
 648 {
 649         char *mesg = buf;
 650         int fd, err;
 651
 652         err = get_int(&mesg, &fd);
 653         if (err != 0 || fd < 0)
 654                 return -EINVAL;
 655
 656         err = nfsd_create_serv();
 657         if (err != 0)
 658                 return err;
 659
 660         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 661         if (err < 0) {
 662                 svc_destroy(nfsd_serv);
 663                 return err;
 664         }
 665
 666         /* Decrease the count, but don't shut down the service */
 667         nfsd_serv->sv_nrthreads--;
 668         return err;
 669 }
 670
 671 /*
 672  * A '-' followed by the 'name' of a socket means we close the socket.
 673  */
 674 static ssize_t __write_ports_delfd(char *buf)
 675 {
 676         char *toclose;
 677         int len = 0;
 678
 679         toclose = kstrdup(buf + 1, GFP_KERNEL);
 680         if (toclose == NULL)
 681                 return -ENOMEM;
 682
 683         if (nfsd_serv != NULL)
 684                 len = svc_sock_names(nfsd_serv, buf,
 685                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 686         kfree(toclose);
 687         return len;
 688 }
 689
 690 /*
 691  * A transport listener is added by writing it's transport name and
 692  * a port number.
 693  */
 694 static ssize_t __write_ports_addxprt(char *buf)
 695 {
 696         char transport[16];
 697         struct svc_xprt *xprt;
 698         int port, err;
 699
 700         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 701                 return -EINVAL;
 702
 703         if (port < 1 || port > USHRT_MAX)
 704                 return -EINVAL;
 705
 706         err = nfsd_create_serv();
 707         if (err != 0)
 708                 return err;
 709
 710         err = svc_create_xprt(nfsd_serv, transport, &init_net,
 711                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 712         if (err < 0)
 713                 goto out_err;
 714
 715         err = svc_create_xprt(nfsd_serv, transport, &init_net,
 716                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
 717         if (err < 0 && err != -EAFNOSUPPORT)
 718                 goto out_close;
 719
 720         /* Decrease the count, but don't shut down the service */
 721         nfsd_serv->sv_nrthreads--;
 722         return 0;
 723 out_close:
 724         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
 725         if (xprt != NULL) {
 726                 svc_close_xprt(xprt);
 727                 svc_xprt_put(xprt);
 728         }
 729 out_err:
 730         svc_destroy(nfsd_serv);
 731         return err;
 732 }
 733
 734 /*
 735  * A transport listener is removed by writing a "-", it's transport
 736  * name, and it's port number.
 737  */
 738 static ssize_t __write_ports_delxprt(char *buf)
 739 {
 740         struct svc_xprt *xprt;
 741         char transport[16];
 742         int port;
 743
 744         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
 745                 return -EINVAL;
 746
 747         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
 748                 return -EINVAL;
 749
 750         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
 751         if (xprt == NULL)
 752                 return -ENOTCONN;
 753
 754         svc_close_xprt(xprt);
 755         svc_xprt_put(xprt);
 756         return 0;
 757 }
 758
 759 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 760 {
 761         if (size == 0)
 762                 return __write_ports_names(buf);
 763
 764         if (isdigit(buf[0]))
 765                 return __write_ports_addfd(buf);
 766
 767         if (buf[0] == '-' && isdigit(buf[1]))
 768                 return __write_ports_delfd(buf);
 769
 770         if (isalpha(buf[0]))
 771                 return __write_ports_addxprt(buf);
 772
 773         if (buf[0] == '-' && isalpha(buf[1]))
 774                 return __write_ports_delxprt(buf);
 775
 776         return -EINVAL;
 777 }
 778
 779 /**
 780  * write_ports - Pass a socket file descriptor or transport name to listen on
 781  *
 782  * Input:
 783  *                      buf:            ignored
 784  *                      size:           zero
 785  * Output:
 786  *      On success:     passed-in buffer filled with a '\n'-terminated C
 787  *                      string containing a whitespace-separated list of
 788  *                      named NFSD listeners;
 789  *                      return code is the size in bytes of the string
 790  *      On error:       return code is zero or a negative errno value
 791  *
 792  * OR
 793  *
 794  * Input:
 795  *                      buf:            C string containing an unsigned
 796  *                                      integer value representing a bound
 797  *                                      but unconnected socket that is to be
 798  *                                      used as an NFSD listener; listen(3)
 799  *                                      must be called for a SOCK_STREAM
 800  *                                      socket, otherwise it is ignored
 801  *                      size:           non-zero length of C string in @buf
 802  * Output:
 803  *      On success:     NFS service is started;
 804  *                      passed-in buffer filled with a '\n'-terminated C
 805  *                      string containing a unique alphanumeric name of
 806  *                      the listener;
 807  *                      return code is the size in bytes of the string
 808  *      On error:       return code is a negative errno value
 809  *
 810  * OR
 811  *
 812  * Input:
 813  *                      buf:            C string containing a "-" followed
 814  *                                      by an integer value representing a
 815  *                                      previously passed in socket file
 816  *                                      descriptor
 817  *                      size:           non-zero length of C string in @buf
 818  * Output:
 819  *      On success:     NFS service no longer listens on that socket;
 820  *                      passed-in buffer filled with a '\n'-terminated C
 821  *                      string containing a unique name of the listener;
 822  *                      return code is the size in bytes of the string
 823  *      On error:       return code is a negative errno value
 824  *
 825  * OR
 826  *
 827  * Input:
 828  *                      buf:            C string containing a transport
 829  *                                      name and an unsigned integer value
 830  *                                      representing the port to listen on,
 831  *                                      separated by whitespace
 832  *                      size:           non-zero length of C string in @buf
 833  * Output:
 834  *      On success:     returns zero; NFS service is started
 835  *      On error:       return code is a negative errno value
 836  *
 837  * OR
 838  *
 839  * Input:
 840  *                      buf:            C string containing a "-" followed
 841  *                                      by a transport name and an unsigned
 842  *                                      integer value representing the port
 843  *                                      to listen on, separated by whitespace
 844  *                      size:           non-zero length of C string in @buf
 845  * Output:
 846  *      On success:     returns zero; NFS service no longer listens
 847  *                      on that transport
 848  *      On error:       return code is a negative errno value
 849  */
 850 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 851 {
 852         ssize_t rv;
 853
 854         mutex_lock(&nfsd_mutex);
 855         rv = __write_ports(file, buf, size);
 856         mutex_unlock(&nfsd_mutex);
 857         return rv;
 858 }
 859
 860
 861 int nfsd_max_blksize;
 862
 863 /**
 864  * write_maxblksize - Set or report the current NFS blksize
 865  *
 866  * Input:
 867  *                      buf:            ignored
 868  *                      size:           zero
 869  *
 870  * OR
 871  *
 872  * Input:
 873  *                      buf:            C string containing an unsigned
 874  *                                      integer value representing the new
 875  *                                      NFS blksize
 876  *                      size:           non-zero length of C string in @buf
 877  * Output:
 878  *      On success:     passed-in buffer filled with '\n'-terminated C string
 879  *                      containing numeric value of the current NFS blksize
 880  *                      setting;
 881  *                      return code is the size in bytes of the string
 882  *      On error:       return code is zero or a negative errno value
 883  */
 884 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 885 {
 886         char *mesg = buf;
 887         if (size > 0) {
 888                 int bsize;
 889                 int rv = get_int(&mesg, &bsize);
 890                 if (rv)
 891                         return rv;
 892                 /* force bsize into allowed range and
 893                  * required alignment.
 894                  */
 895                 if (bsize < 1024)
 896                         bsize = 1024;
 897                 if (bsize > NFSSVC_MAXBLKSIZE)
 898                         bsize = NFSSVC_MAXBLKSIZE;
 899                 bsize &= ~(1024-1);
 900                 mutex_lock(&nfsd_mutex);
 901                 if (nfsd_serv) {
 902                         mutex_unlock(&nfsd_mutex);
 903                         return -EBUSY;
 904                 }
 905                 nfsd_max_blksize = bsize;
 906                 mutex_unlock(&nfsd_mutex);
 907         }
 908
 909         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 910                                                         nfsd_max_blksize);
 911 }
 912
 913 #ifdef CONFIG_NFSD_V4
 914 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 915 {
 916         char *mesg = buf;
 917         int rv, i;
 918
 919         if (size > 0) {
 920                 if (nfsd_serv)
 921                         return -EBUSY;
 922                 rv = get_int(&mesg, &i);
 923                 if (rv)
 924                         return rv;
 925                 /*
 926                  * Some sanity checking.  We don't have a reason for
 927                  * these particular numbers, but problems with the
 928                  * extremes are:
 929                  *      - Too short: the briefest network outage may
 930                  *        cause clients to lose all their locks.  Also,
 931                  *        the frequent polling may be wasteful.
 932                  *      - Too long: do you really want reboot recovery
 933                  *        to take more than an hour?  Or to make other
 934                  *        clients wait an hour before being able to
 935                  *        revoke a dead client's locks?
 936                  */
 937                 if (i < 10 || i > 3600)
 938                         return -EINVAL;
 939                 *time = i;
 940         }
 941
 942         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 943 }
 944
 945 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 946 {
 947         ssize_t rv;
 948
 949         mutex_lock(&nfsd_mutex);
 950         rv = __nfsd4_write_time(file, buf, size, time);
 951         mutex_unlock(&nfsd_mutex);
 952         return rv;
 953 }
 954
 955 /**
 956  * write_leasetime - Set or report the current NFSv4 lease time
 957  *
 958  * Input:
 959  *                      buf:            ignored
 960  *                      size:           zero
 961  *
 962  * OR
 963  *
 964  * Input:
 965  *                      buf:            C string containing an unsigned
 966  *                                      integer value representing the new
 967  *                                      NFSv4 lease expiry time
 968  *                      size:           non-zero length of C string in @buf
 969  * Output:
 970  *      On success:     passed-in buffer filled with '\n'-terminated C
 971  *                      string containing unsigned integer value of the
 972  *                      current lease expiry time;
 973  *                      return code is the size in bytes of the string
 974  *      On error:       return code is zero or a negative errno value
 975  */
 976 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 977 {
 978         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
 979 }
 980
 981 /**
 982  * write_gracetime - Set or report current NFSv4 grace period time
 983  *
 984  * As above, but sets the time of the NFSv4 grace period.
 985  *
 986  * Note this should never be set to less than the *previous*
 987  * lease-period time, but we don't try to enforce this.  (In the common
 988  * case (a new boot), we don't know what the previous lease time was
 989  * anyway.)
 990  */
 991 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
 992 {
 993         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
 994 }
 995
 996 extern char *nfs4_recoverydir(void);
 997
 998 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
 999 {
1000         char *mesg = buf;
1001         char *recdir;
1002         int len, status;
1003
1004         if (size > 0) {
1005                 if (nfsd_serv)
1006                         return -EBUSY;
1007                 if (size > PATH_MAX || buf[size-1] != '\n')
1008                         return -EINVAL;
1009                 buf[size-1] = 0;
1010
1011                 recdir = mesg;
1012                 len = qword_get(&mesg, recdir, size);
1013                 if (len <= 0)
1014                         return -EINVAL;
1015
1016                 status = nfs4_reset_recoverydir(recdir);
1017                 if (status)
1018                         return status;
1019         }
1020
1021         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1022                                                         nfs4_recoverydir());
1023 }
1024
1025 /**
1026  * write_recoverydir - Set or report the pathname of the recovery directory
1027  *
1028  * Input:
1029  *                      buf:            ignored
1030  *                      size:           zero
1031  *
1032  * OR
1033  *
1034  * Input:
1035  *                      buf:            C string containing the pathname
1036  *                                      of the directory on a local file
1037  *                                      system containing permanent NFSv4
1038  *                                      recovery data
1039  *                      size:           non-zero length of C string in @buf
1040  * Output:
1041  *      On success:     passed-in buffer filled with '\n'-terminated C string
1042  *                      containing the current recovery pathname setting;
1043  *                      return code is the size in bytes of the string
1044  *      On error:       return code is zero or a negative errno value
1045  */
1046 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1047 {
1048         ssize_t rv;
1049
1050         mutex_lock(&nfsd_mutex);
1051         rv = __write_recoverydir(file, buf, size);
1052         mutex_unlock(&nfsd_mutex);
1053         return rv;
1054 }
1055
1056 #endif
1057
1058 /*----------------------------------------------------------------------------*/
1059 /*
1060  *      populating the filesystem.
1061  */
1062
1063 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1064 {
1065         static struct tree_descr nfsd_files[] = {
1066                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1067                 [NFSD_Export_features] = {"export_features",
1068                                         &export_features_operations, S_IRUGO},
1069                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1070                                         &transaction_ops, S_IWUSR|S_IRUSR},
1071                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1072                                         &transaction_ops, S_IWUSR|S_IRUSR},
1073                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1074                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1075                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1076                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1077                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1078                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1079                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1080 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1081                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1082 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1083 #ifdef CONFIG_NFSD_V4
1084                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1085                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1086                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1087 #endif
1088                 /* last one */ {""}
1089         };
1090         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1091 }
1092
1093 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1094         int flags, const char *dev_name, void *data)
1095 {
1096         return mount_single(fs_type, flags, data, nfsd_fill_super);
1097 }
1098
1099 static struct file_system_type nfsd_fs_type = {
1100         .owner          = THIS_MODULE,
1101         .name           = "nfsd",
1102         .mount          = nfsd_mount,
1103         .kill_sb        = kill_litter_super,
1104 };
1105
1106 #ifdef CONFIG_PROC_FS
1107 static int create_proc_exports_entry(void)
1108 {
1109         struct proc_dir_entry *entry;
1110
1111         entry = proc_mkdir("fs/nfs", NULL);
1112         if (!entry)
1113                 return -ENOMEM;
1114         entry = proc_create("exports", 0, entry, &exports_operations);
1115         if (!entry)
1116                 return -ENOMEM;
1117         return 0;
1118 }
1119 #else /* CONFIG_PROC_FS */
1120 static int create_proc_exports_entry(void)
1121 {
1122         return 0;
1123 }
1124 #endif
1125
1126 static int __init init_nfsd(void)
1127 {
1128         int retval;
1129         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1130
1131         retval = nfs4_state_init(); /* nfs4 locking state */
1132         if (retval)
1133                 return retval;
1134         nfsd_stat_init();       /* Statistics */
1135         retval = nfsd_reply_cache_init();
1136         if (retval)
1137                 goto out_free_stat;
1138         retval = nfsd_export_init();
1139         if (retval)
1140                 goto out_free_cache;
1141         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1142         retval = nfsd_idmap_init();
1143         if (retval)
1144                 goto out_free_lockd;
1145         retval = create_proc_exports_entry();
1146         if (retval)
1147                 goto out_free_idmap;
1148         retval = register_filesystem(&nfsd_fs_type);
1149         if (retval)
1150                 goto out_free_all;
1151         return 0;
1152 out_free_all:
1153         remove_proc_entry("fs/nfs/exports", NULL);
1154         remove_proc_entry("fs/nfs", NULL);
1155 out_free_idmap:
1156         nfsd_idmap_shutdown();
1157 out_free_lockd:
1158         nfsd_lockd_shutdown();
1159         nfsd_export_shutdown();
1160 out_free_cache:
1161         nfsd_reply_cache_shutdown();
1162 out_free_stat:
1163         nfsd_stat_shutdown();
1164         nfsd4_free_slabs();
1165         return retval;
1166 }
1167
1168 static void __exit exit_nfsd(void)
1169 {
1170         nfsd_export_shutdown();
1171         nfsd_reply_cache_shutdown();
1172         remove_proc_entry("fs/nfs/exports", NULL);
1173         remove_proc_entry("fs/nfs", NULL);
1174         nfsd_stat_shutdown();
1175         nfsd_lockd_shutdown();
1176         nfsd_idmap_shutdown();
1177         nfsd4_free_slabs();
1178         unregister_filesystem(&nfsd_fs_type);
1179 }
1180
1181 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1182 MODULE_LICENSE("GPL");
1183 module_init(init_nfsd)
1184 module_exit(exit_nfsd)