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 "state.h"
  23 #include "netns.h"
  24
  25 /*
  26  *      We have a single directory with several nodes in it.
  27  */
  28 enum {
  29         NFSD_Root = 1,
  30         NFSD_List,
  31         NFSD_Export_features,
  32         NFSD_Fh,
  33         NFSD_FO_UnlockIP,
  34         NFSD_FO_UnlockFS,
  35         NFSD_Threads,
  36         NFSD_Pool_Threads,
  37         NFSD_Pool_Stats,
  38         NFSD_Versions,
  39         NFSD_Ports,
  40         NFSD_MaxBlkSize,
  41         NFSD_SupportedEnctypes,
  42         /*
  43          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  44          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  45          */
  46 #ifdef CONFIG_NFSD_V4
  47         NFSD_Leasetime,
  48         NFSD_Gracetime,
  49         NFSD_RecoveryDir,
  50 #endif
  51 };
  52
  53 /*
  54  * write() for these nodes.
  55  */
  56 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  57 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  58 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  59 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  60 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  61 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  62 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  63 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  64 #ifdef CONFIG_NFSD_V4
  65 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  66 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  67 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  68 #endif
  69
  70 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  71         [NFSD_Fh] = write_filehandle,
  72         [NFSD_FO_UnlockIP] = write_unlock_ip,
  73         [NFSD_FO_UnlockFS] = write_unlock_fs,
  74         [NFSD_Threads] = write_threads,
  75         [NFSD_Pool_Threads] = write_pool_threads,
  76         [NFSD_Versions] = write_versions,
  77         [NFSD_Ports] = write_ports,
  78         [NFSD_MaxBlkSize] = write_maxblksize,
  79 #ifdef CONFIG_NFSD_V4
  80         [NFSD_Leasetime] = write_leasetime,
  81         [NFSD_Gracetime] = write_gracetime,
  82         [NFSD_RecoveryDir] = write_recoverydir,
  83 #endif
  84 };
  85
  86 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  87 {
  88         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
  89         char *data;
  90         ssize_t rv;
  91
  92         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
  93                 return -EINVAL;
  94
  95         data = simple_transaction_get(file, buf, size);
  96         if (IS_ERR(data))
  97                 return PTR_ERR(data);
  98
  99         rv =  write_op[ino](file, data, size);
 100         if (rv >= 0) {
 101                 simple_transaction_set(file, rv);
 102                 rv = size;
 103         }
 104         return rv;
 105 }
 106
 107 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 108 {
 109         if (! file->private_data) {
 110                 /* An attempt to read a transaction file without writing
 111                  * causes a 0-byte write so that the file can return
 112                  * state information
 113                  */
 114                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 115                 if (rv < 0)
 116                         return rv;
 117         }
 118         return simple_transaction_read(file, buf, size, pos);
 119 }
 120
 121 static const struct file_operations transaction_ops = {
 122         .write          = nfsctl_transaction_write,
 123         .read           = nfsctl_transaction_read,
 124         .release        = simple_transaction_release,
 125         .llseek         = default_llseek,
 126 };
 127
 128 static int exports_open(struct inode *inode, struct file *file)
 129 {
 130         int err;
 131         struct seq_file *seq;
 132         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
 133
 134         err = seq_open(file, &nfs_exports_op);
 135         if (err)
 136                 return err;
 137
 138         seq = file->private_data;
 139         seq->private = nn->svc_export_cache;
 140         return 0;
 141 }
 142
 143 static const struct file_operations exports_operations = {
 144         .open           = exports_open,
 145         .read           = seq_read,
 146         .llseek         = seq_lseek,
 147         .release        = seq_release,
 148         .owner          = THIS_MODULE,
 149 };
 150
 151 static int export_features_show(struct seq_file *m, void *v)
 152 {
 153         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 154         return 0;
 155 }
 156
 157 static int export_features_open(struct inode *inode, struct file *file)
 158 {
 159         return single_open(file, export_features_show, NULL);
 160 }
 161
 162 static struct file_operations export_features_operations = {
 163         .open           = export_features_open,
 164         .read           = seq_read,
 165         .llseek         = seq_lseek,
 166         .release        = single_release,
 167 };
 168
 169 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 170 static int supported_enctypes_show(struct seq_file *m, void *v)
 171 {
 172         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 173         return 0;
 174 }
 175
 176 static int supported_enctypes_open(struct inode *inode, struct file *file)
 177 {
 178         return single_open(file, supported_enctypes_show, NULL);
 179 }
 180
 181 static struct file_operations supported_enctypes_ops = {
 182         .open           = supported_enctypes_open,
 183         .read           = seq_read,
 184         .llseek         = seq_lseek,
 185         .release        = single_release,
 186 };
 187 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 188
 189 static const struct file_operations pool_stats_operations = {
 190         .open           = nfsd_pool_stats_open,
 191         .read           = seq_read,
 192         .llseek         = seq_lseek,
 193         .release        = nfsd_pool_stats_release,
 194         .owner          = THIS_MODULE,
 195 };
 196
 197 /*----------------------------------------------------------------------------*/
 198 /*
 199  * payload - write methods
 200  */
 201
 202
 203 /**
 204  * write_unlock_ip - Release all locks used by a client
 205  *
 206  * Experimental.
 207  *
 208  * Input:
 209  *                      buf:    '\n'-terminated C string containing a
 210  *                              presentation format IP address
 211  *                      size:   length of C string in @buf
 212  * Output:
 213  *      On success:     returns zero if all specified locks were released;
 214  *                      returns one if one or more locks were not released
 215  *      On error:       return code is negative errno value
 216  */
 217 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 218 {
 219         struct sockaddr_storage address;
 220         struct sockaddr *sap = (struct sockaddr *)&address;
 221         size_t salen = sizeof(address);
 222         char *fo_path;
 223
 224         /* sanity check */
 225         if (size == 0)
 226                 return -EINVAL;
 227
 228         if (buf[size-1] != '\n')
 229                 return -EINVAL;
 230
 231         fo_path = buf;
 232         if (qword_get(&buf, fo_path, size) < 0)
 233                 return -EINVAL;
 234
 235         if (rpc_pton(&init_net, fo_path, size, sap, salen) == 0)
 236                 return -EINVAL;
 237
 238         return nlmsvc_unlock_all_by_ip(sap);
 239 }
 240
 241 /**
 242  * write_unlock_fs - Release all locks on a local file system
 243  *
 244  * Experimental.
 245  *
 246  * Input:
 247  *                      buf:    '\n'-terminated C string containing the
 248  *                              absolute pathname of a local file system
 249  *                      size:   length of C string in @buf
 250  * Output:
 251  *      On success:     returns zero if all specified locks were released;
 252  *                      returns one if one or more locks were not released
 253  *      On error:       return code is negative errno value
 254  */
 255 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 256 {
 257         struct path path;
 258         char *fo_path;
 259         int error;
 260
 261         /* sanity check */
 262         if (size == 0)
 263                 return -EINVAL;
 264
 265         if (buf[size-1] != '\n')
 266                 return -EINVAL;
 267
 268         fo_path = buf;
 269         if (qword_get(&buf, fo_path, size) < 0)
 270                 return -EINVAL;
 271
 272         error = kern_path(fo_path, 0, &path);
 273         if (error)
 274                 return error;
 275
 276         /*
 277          * XXX: Needs better sanity checking.  Otherwise we could end up
 278          * releasing locks on the wrong file system.
 279          *
 280          * For example:
 281          * 1.  Does the path refer to a directory?
 282          * 2.  Is that directory a mount point, or
 283          * 3.  Is that directory the root of an exported file system?
 284          */
 285         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 286
 287         path_put(&path);
 288         return error;
 289 }
 290
 291 /**
 292  * write_filehandle - Get a variable-length NFS file handle by path
 293  *
 294  * On input, the buffer contains a '\n'-terminated C string comprised of
 295  * three alphanumeric words separated by whitespace.  The string may
 296  * contain escape sequences.
 297  *
 298  * Input:
 299  *                      buf:
 300  *                              domain:         client domain name
 301  *                              path:           export pathname
 302  *                              maxsize:        numeric maximum size of
 303  *                                              @buf
 304  *                      size:   length of C string in @buf
 305  * Output:
 306  *      On success:     passed-in buffer filled with '\n'-terminated C
 307  *                      string containing a ASCII hex text version
 308  *                      of the NFS file handle;
 309  *                      return code is the size in bytes of the string
 310  *      On error:       return code is negative errno value
 311  */
 312 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 313 {
 314         char *dname, *path;
 315         int uninitialized_var(maxsize);
 316         char *mesg = buf;
 317         int len;
 318         struct auth_domain *dom;
 319         struct knfsd_fh fh;
 320
 321         if (size == 0)
 322                 return -EINVAL;
 323
 324         if (buf[size-1] != '\n')
 325                 return -EINVAL;
 326         buf[size-1] = 0;
 327
 328         dname = mesg;
 329         len = qword_get(&mesg, dname, size);
 330         if (len <= 0)
 331                 return -EINVAL;
 332
 333         path = dname+len+1;
 334         len = qword_get(&mesg, path, size);
 335         if (len <= 0)
 336                 return -EINVAL;
 337
 338         len = get_int(&mesg, &maxsize);
 339         if (len)
 340                 return len;
 341
 342         if (maxsize < NFS_FHSIZE)
 343                 return -EINVAL;
 344         if (maxsize > NFS3_FHSIZE)
 345                 maxsize = NFS3_FHSIZE;
 346
 347         if (qword_get(&mesg, mesg, size)>0)
 348                 return -EINVAL;
 349
 350         /* we have all the words, they are in buf.. */
 351         dom = unix_domain_find(dname);
 352         if (!dom)
 353                 return -ENOMEM;
 354
 355         len = exp_rootfh(&init_net, dom, path, &fh,  maxsize);
 356         auth_domain_put(dom);
 357         if (len)
 358                 return len;
 359
 360         mesg = buf;
 361         len = SIMPLE_TRANSACTION_LIMIT;
 362         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 363         mesg[-1] = '\n';
 364         return mesg - buf;
 365 }
 366
 367 /**
 368  * write_threads - Start NFSD, or report the current number of running threads
 369  *
 370  * Input:
 371  *                      buf:            ignored
 372  *                      size:           zero
 373  * Output:
 374  *      On success:     passed-in buffer filled with '\n'-terminated C
 375  *                      string numeric value representing the number of
 376  *                      running NFSD threads;
 377  *                      return code is the size in bytes of the string
 378  *      On error:       return code is zero
 379  *
 380  * OR
 381  *
 382  * Input:
 383  *                      buf:            C string containing an unsigned
 384  *                                      integer value representing the
 385  *                                      number of NFSD threads to start
 386  *                      size:           non-zero length of C string in @buf
 387  * Output:
 388  *      On success:     NFS service is started;
 389  *                      passed-in buffer filled with '\n'-terminated C
 390  *                      string numeric value representing the number of
 391  *                      running NFSD threads;
 392  *                      return code is the size in bytes of the string
 393  *      On error:       return code is zero or a negative errno value
 394  */
 395 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 396 {
 397         char *mesg = buf;
 398         int rv;
 399         if (size > 0) {
 400                 int newthreads;
 401                 rv = get_int(&mesg, &newthreads);
 402                 if (rv)
 403                         return rv;
 404                 if (newthreads < 0)
 405                         return -EINVAL;
 406                 rv = nfsd_svc(newthreads);
 407                 if (rv < 0)
 408                         return rv;
 409         } else
 410                 rv = nfsd_nrthreads();
 411
 412         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 413 }
 414
 415 /**
 416  * write_pool_threads - Set or report the current number of threads per pool
 417  *
 418  * Input:
 419  *                      buf:            ignored
 420  *                      size:           zero
 421  *
 422  * OR
 423  *
 424  * Input:
 425  *                      buf:            C string containing whitespace-
 426  *                                      separated unsigned integer values
 427  *                                      representing the number of NFSD
 428  *                                      threads to start in each pool
 429  *                      size:           non-zero length of C string in @buf
 430  * Output:
 431  *      On success:     passed-in buffer filled with '\n'-terminated C
 432  *                      string containing integer values representing the
 433  *                      number of NFSD threads in each pool;
 434  *                      return code is the size in bytes of the string
 435  *      On error:       return code is zero or a negative errno value
 436  */
 437 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 438 {
 439         /* if size > 0, look for an array of number of threads per node
 440          * and apply them  then write out number of threads per node as reply
 441          */
 442         char *mesg = buf;
 443         int i;
 444         int rv;
 445         int len;
 446         int npools;
 447         int *nthreads;
 448
 449         mutex_lock(&nfsd_mutex);
 450         npools = nfsd_nrpools();
 451         if (npools == 0) {
 452                 /*
 453                  * NFS is shut down.  The admin can start it by
 454                  * writing to the threads file but NOT the pool_threads
 455                  * file, sorry.  Report zero threads.
 456                  */
 457                 mutex_unlock(&nfsd_mutex);
 458                 strcpy(buf, "0\n");
 459                 return strlen(buf);
 460         }
 461
 462         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 463         rv = -ENOMEM;
 464         if (nthreads == NULL)
 465                 goto out_free;
 466
 467         if (size > 0) {
 468                 for (i = 0; i < npools; i++) {
 469                         rv = get_int(&mesg, &nthreads[i]);
 470                         if (rv == -ENOENT)
 471                                 break;          /* fewer numbers than pools */
 472                         if (rv)
 473                                 goto out_free;  /* syntax error */
 474                         rv = -EINVAL;
 475                         if (nthreads[i] < 0)
 476                                 goto out_free;
 477                 }
 478                 rv = nfsd_set_nrthreads(i, nthreads);
 479                 if (rv)
 480                         goto out_free;
 481         }
 482
 483         rv = nfsd_get_nrthreads(npools, nthreads);
 484         if (rv)
 485                 goto out_free;
 486
 487         mesg = buf;
 488         size = SIMPLE_TRANSACTION_LIMIT;
 489         for (i = 0; i < npools && size > 0; i++) {
 490                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 491                 len = strlen(mesg);
 492                 size -= len;
 493                 mesg += len;
 494         }
 495         rv = mesg - buf;
 496 out_free:
 497         kfree(nthreads);
 498         mutex_unlock(&nfsd_mutex);
 499         return rv;
 500 }
 501
 502 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 503 {
 504         char *mesg = buf;
 505         char *vers, *minorp, sign;
 506         int len, num, remaining;
 507         unsigned minor;
 508         ssize_t tlen = 0;
 509         char *sep;
 510
 511         if (size>0) {
 512                 if (nfsd_serv)
 513                         /* Cannot change versions without updating
 514                          * nfsd_serv->sv_xdrsize, and reallocing
 515                          * rq_argp and rq_resp
 516                          */
 517                         return -EBUSY;
 518                 if (buf[size-1] != '\n')
 519                         return -EINVAL;
 520                 buf[size-1] = 0;
 521
 522                 vers = mesg;
 523                 len = qword_get(&mesg, vers, size);
 524                 if (len <= 0) return -EINVAL;
 525                 do {
 526                         sign = *vers;
 527                         if (sign == '+' || sign == '-')
 528                                 num = simple_strtol((vers+1), &minorp, 0);
 529                         else
 530                                 num = simple_strtol(vers, &minorp, 0);
 531                         if (*minorp == '.') {
 532                                 if (num < 4)
 533                                         return -EINVAL;
 534                                 minor = simple_strtoul(minorp+1, NULL, 0);
 535                                 if (minor == 0)
 536                                         return -EINVAL;
 537                                 if (nfsd_minorversion(minor, sign == '-' ?
 538                                                      NFSD_CLEAR : NFSD_SET) < 0)
 539                                         return -EINVAL;
 540                                 goto next;
 541                         }
 542                         switch(num) {
 543                         case 2:
 544                         case 3:
 545                         case 4:
 546                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 547                                 break;
 548                         default:
 549                                 return -EINVAL;
 550                         }
 551                 next:
 552                         vers += len + 1;
 553                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 554                 /* If all get turned off, turn them back on, as
 555                  * having no versions is BAD
 556                  */
 557                 nfsd_reset_versions();
 558         }
 559
 560         /* Now write current state into reply buffer */
 561         len = 0;
 562         sep = "";
 563         remaining = SIMPLE_TRANSACTION_LIMIT;
 564         for (num=2 ; num <= 4 ; num++)
 565                 if (nfsd_vers(num, NFSD_AVAIL)) {
 566                         len = snprintf(buf, remaining, "%s%c%d", sep,
 567                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 568                                        num);
 569                         sep = " ";
 570
 571                         if (len > remaining)
 572                                 break;
 573                         remaining -= len;
 574                         buf += len;
 575                         tlen += len;
 576                 }
 577         if (nfsd_vers(4, NFSD_AVAIL))
 578                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 579                      minor++) {
 580                         len = snprintf(buf, remaining, " %c4.%u",
 581                                         (nfsd_vers(4, NFSD_TEST) &&
 582                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 583                                                 '+' : '-',
 584                                         minor);
 585
 586                         if (len > remaining)
 587                                 break;
 588                         remaining -= len;
 589                         buf += len;
 590                         tlen += len;
 591                 }
 592
 593         len = snprintf(buf, remaining, "\n");
 594         if (len > remaining)
 595                 return -EINVAL;
 596         return tlen + len;
 597 }
 598
 599 /**
 600  * write_versions - Set or report the available NFS protocol versions
 601  *
 602  * Input:
 603  *                      buf:            ignored
 604  *                      size:           zero
 605  * Output:
 606  *      On success:     passed-in buffer filled with '\n'-terminated C
 607  *                      string containing positive or negative integer
 608  *                      values representing the current status of each
 609  *                      protocol version;
 610  *                      return code is the size in bytes of the string
 611  *      On error:       return code is zero or a negative errno value
 612  *
 613  * OR
 614  *
 615  * Input:
 616  *                      buf:            C string containing whitespace-
 617  *                                      separated positive or negative
 618  *                                      integer values representing NFS
 619  *                                      protocol versions to enable ("+n")
 620  *                                      or disable ("-n")
 621  *                      size:           non-zero length of C string in @buf
 622  * Output:
 623  *      On success:     status of zero or more protocol versions has
 624  *                      been updated; passed-in buffer filled with
 625  *                      '\n'-terminated C string containing positive
 626  *                      or negative integer values representing the
 627  *                      current status of each protocol version;
 628  *                      return code is the size in bytes of the string
 629  *      On error:       return code is zero or a negative errno value
 630  */
 631 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 632 {
 633         ssize_t rv;
 634
 635         mutex_lock(&nfsd_mutex);
 636         rv = __write_versions(file, buf, size);
 637         mutex_unlock(&nfsd_mutex);
 638         return rv;
 639 }
 640
 641 /*
 642  * Zero-length write.  Return a list of NFSD's current listener
 643  * transports.
 644  */
 645 static ssize_t __write_ports_names(char *buf)
 646 {
 647         if (nfsd_serv == NULL)
 648                 return 0;
 649         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 650 }
 651
 652 /*
 653  * A single 'fd' number was written, in which case it must be for
 654  * a socket of a supported family/protocol, and we use it as an
 655  * nfsd listener.
 656  */
 657 static ssize_t __write_ports_addfd(char *buf)
 658 {
 659         char *mesg = buf;
 660         int fd, err;
 661         struct net *net = &init_net;
 662
 663         err = get_int(&mesg, &fd);
 664         if (err != 0 || fd < 0)
 665                 return -EINVAL;
 666
 667         err = nfsd_create_serv();
 668         if (err != 0)
 669                 return err;
 670
 671         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 672         if (err < 0) {
 673                 nfsd_destroy(net);
 674                 return err;
 675         }
 676
 677         /* Decrease the count, but don't shut down the service */
 678         nfsd_serv->sv_nrthreads--;
 679         return err;
 680 }
 681
 682 /*
 683  * A transport listener is added by writing it's transport name and
 684  * a port number.
 685  */
 686 static ssize_t __write_ports_addxprt(char *buf)
 687 {
 688         char transport[16];
 689         struct svc_xprt *xprt;
 690         int port, err;
 691         struct net *net = &init_net;
 692
 693         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
 694                 return -EINVAL;
 695
 696         if (port < 1 || port > USHRT_MAX)
 697                 return -EINVAL;
 698
 699         err = nfsd_create_serv();
 700         if (err != 0)
 701                 return err;
 702
 703         err = svc_create_xprt(nfsd_serv, transport, net,
 704                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 705         if (err < 0)
 706                 goto out_err;
 707
 708         err = svc_create_xprt(nfsd_serv, transport, net,
 709                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
 710         if (err < 0 && err != -EAFNOSUPPORT)
 711                 goto out_close;
 712
 713         /* Decrease the count, but don't shut down the service */
 714         nfsd_serv->sv_nrthreads--;
 715         return 0;
 716 out_close:
 717         xprt = svc_find_xprt(nfsd_serv, transport, net, PF_INET, port);
 718         if (xprt != NULL) {
 719                 svc_close_xprt(xprt);
 720                 svc_xprt_put(xprt);
 721         }
 722 out_err:
 723         nfsd_destroy(net);
 724         return err;
 725 }
 726
 727 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 728 {
 729         if (size == 0)
 730                 return __write_ports_names(buf);
 731
 732         if (isdigit(buf[0]))
 733                 return __write_ports_addfd(buf);
 734
 735         if (isalpha(buf[0]))
 736                 return __write_ports_addxprt(buf);
 737
 738         return -EINVAL;
 739 }
 740
 741 /**
 742  * write_ports - Pass a socket file descriptor or transport name to listen on
 743  *
 744  * Input:
 745  *                      buf:            ignored
 746  *                      size:           zero
 747  * Output:
 748  *      On success:     passed-in buffer filled with a '\n'-terminated C
 749  *                      string containing a whitespace-separated list of
 750  *                      named NFSD listeners;
 751  *                      return code is the size in bytes of the string
 752  *      On error:       return code is zero or a negative errno value
 753  *
 754  * OR
 755  *
 756  * Input:
 757  *                      buf:            C string containing an unsigned
 758  *                                      integer value representing a bound
 759  *                                      but unconnected socket that is to be
 760  *                                      used as an NFSD listener; listen(3)
 761  *                                      must be called for a SOCK_STREAM
 762  *                                      socket, otherwise it is ignored
 763  *                      size:           non-zero length of C string in @buf
 764  * Output:
 765  *      On success:     NFS service is started;
 766  *                      passed-in buffer filled with a '\n'-terminated C
 767  *                      string containing a unique alphanumeric name of
 768  *                      the listener;
 769  *                      return code is the size in bytes of the string
 770  *      On error:       return code is a negative errno value
 771  *
 772  * OR
 773  *
 774  * Input:
 775  *                      buf:            C string containing a transport
 776  *                                      name and an unsigned integer value
 777  *                                      representing the port to listen on,
 778  *                                      separated by whitespace
 779  *                      size:           non-zero length of C string in @buf
 780  * Output:
 781  *      On success:     returns zero; NFS service is started
 782  *      On error:       return code is a negative errno value
 783  */
 784 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 785 {
 786         ssize_t rv;
 787
 788         mutex_lock(&nfsd_mutex);
 789         rv = __write_ports(file, buf, size);
 790         mutex_unlock(&nfsd_mutex);
 791         return rv;
 792 }
 793
 794
 795 int nfsd_max_blksize;
 796
 797 /**
 798  * write_maxblksize - Set or report the current NFS blksize
 799  *
 800  * Input:
 801  *                      buf:            ignored
 802  *                      size:           zero
 803  *
 804  * OR
 805  *
 806  * Input:
 807  *                      buf:            C string containing an unsigned
 808  *                                      integer value representing the new
 809  *                                      NFS blksize
 810  *                      size:           non-zero length of C string in @buf
 811  * Output:
 812  *      On success:     passed-in buffer filled with '\n'-terminated C string
 813  *                      containing numeric value of the current NFS blksize
 814  *                      setting;
 815  *                      return code is the size in bytes of the string
 816  *      On error:       return code is zero or a negative errno value
 817  */
 818 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 819 {
 820         char *mesg = buf;
 821         if (size > 0) {
 822                 int bsize;
 823                 int rv = get_int(&mesg, &bsize);
 824                 if (rv)
 825                         return rv;
 826                 /* force bsize into allowed range and
 827                  * required alignment.
 828                  */
 829                 if (bsize < 1024)
 830                         bsize = 1024;
 831                 if (bsize > NFSSVC_MAXBLKSIZE)
 832                         bsize = NFSSVC_MAXBLKSIZE;
 833                 bsize &= ~(1024-1);
 834                 mutex_lock(&nfsd_mutex);
 835                 if (nfsd_serv) {
 836                         mutex_unlock(&nfsd_mutex);
 837                         return -EBUSY;
 838                 }
 839                 nfsd_max_blksize = bsize;
 840                 mutex_unlock(&nfsd_mutex);
 841         }
 842
 843         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 844                                                         nfsd_max_blksize);
 845 }
 846
 847 #ifdef CONFIG_NFSD_V4
 848 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 849 {
 850         char *mesg = buf;
 851         int rv, i;
 852
 853         if (size > 0) {
 854                 if (nfsd_serv)
 855                         return -EBUSY;
 856                 rv = get_int(&mesg, &i);
 857                 if (rv)
 858                         return rv;
 859                 /*
 860                  * Some sanity checking.  We don't have a reason for
 861                  * these particular numbers, but problems with the
 862                  * extremes are:
 863                  *      - Too short: the briefest network outage may
 864                  *        cause clients to lose all their locks.  Also,
 865                  *        the frequent polling may be wasteful.
 866                  *      - Too long: do you really want reboot recovery
 867                  *        to take more than an hour?  Or to make other
 868                  *        clients wait an hour before being able to
 869                  *        revoke a dead client's locks?
 870                  */
 871                 if (i < 10 || i > 3600)
 872                         return -EINVAL;
 873                 *time = i;
 874         }
 875
 876         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 877 }
 878
 879 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 880 {
 881         ssize_t rv;
 882
 883         mutex_lock(&nfsd_mutex);
 884         rv = __nfsd4_write_time(file, buf, size, time);
 885         mutex_unlock(&nfsd_mutex);
 886         return rv;
 887 }
 888
 889 /**
 890  * write_leasetime - Set or report the current NFSv4 lease time
 891  *
 892  * Input:
 893  *                      buf:            ignored
 894  *                      size:           zero
 895  *
 896  * OR
 897  *
 898  * Input:
 899  *                      buf:            C string containing an unsigned
 900  *                                      integer value representing the new
 901  *                                      NFSv4 lease expiry time
 902  *                      size:           non-zero length of C string in @buf
 903  * Output:
 904  *      On success:     passed-in buffer filled with '\n'-terminated C
 905  *                      string containing unsigned integer value of the
 906  *                      current lease expiry time;
 907  *                      return code is the size in bytes of the string
 908  *      On error:       return code is zero or a negative errno value
 909  */
 910 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 911 {
 912         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
 913         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease);
 914 }
 915
 916 /**
 917  * write_gracetime - Set or report current NFSv4 grace period time
 918  *
 919  * As above, but sets the time of the NFSv4 grace period.
 920  *
 921  * Note this should never be set to less than the *previous*
 922  * lease-period time, but we don't try to enforce this.  (In the common
 923  * case (a new boot), we don't know what the previous lease time was
 924  * anyway.)
 925  */
 926 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
 927 {
 928         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
 929         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace);
 930 }
 931
 932 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
 933 {
 934         char *mesg = buf;
 935         char *recdir;
 936         int len, status;
 937
 938         if (size > 0) {
 939                 if (nfsd_serv)
 940                         return -EBUSY;
 941                 if (size > PATH_MAX || buf[size-1] != '\n')
 942                         return -EINVAL;
 943                 buf[size-1] = 0;
 944
 945                 recdir = mesg;
 946                 len = qword_get(&mesg, recdir, size);
 947                 if (len <= 0)
 948                         return -EINVAL;
 949
 950                 status = nfs4_reset_recoverydir(recdir);
 951                 if (status)
 952                         return status;
 953         }
 954
 955         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
 956                                                         nfs4_recoverydir());
 957 }
 958
 959 /**
 960  * write_recoverydir - Set or report the pathname of the recovery directory
 961  *
 962  * Input:
 963  *                      buf:            ignored
 964  *                      size:           zero
 965  *
 966  * OR
 967  *
 968  * Input:
 969  *                      buf:            C string containing the pathname
 970  *                                      of the directory on a local file
 971  *                                      system containing permanent NFSv4
 972  *                                      recovery data
 973  *                      size:           non-zero length of C string in @buf
 974  * Output:
 975  *      On success:     passed-in buffer filled with '\n'-terminated C string
 976  *                      containing the current recovery pathname setting;
 977  *                      return code is the size in bytes of the string
 978  *      On error:       return code is zero or a negative errno value
 979  */
 980 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 981 {
 982         ssize_t rv;
 983
 984         mutex_lock(&nfsd_mutex);
 985         rv = __write_recoverydir(file, buf, size);
 986         mutex_unlock(&nfsd_mutex);
 987         return rv;
 988 }
 989
 990 #endif
 991
 992 /*----------------------------------------------------------------------------*/
 993 /*
 994  *      populating the filesystem.
 995  */
 996
 997 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 998 {
 999         static struct tree_descr nfsd_files[] = {
1000                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1001                 [NFSD_Export_features] = {"export_features",
1002                                         &export_features_operations, S_IRUGO},
1003                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1004                                         &transaction_ops, S_IWUSR|S_IRUSR},
1005                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1006                                         &transaction_ops, S_IWUSR|S_IRUSR},
1007                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1008                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1009                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1010                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1011                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1012                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1013                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1014 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1015                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1016 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1017 #ifdef CONFIG_NFSD_V4
1018                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1019                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1020                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1021 #endif
1022                 /* last one */ {""}
1023         };
1024         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1025 }
1026
1027 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1028         int flags, const char *dev_name, void *data)
1029 {
1030         return mount_single(fs_type, flags, data, nfsd_fill_super);
1031 }
1032
1033 static struct file_system_type nfsd_fs_type = {
1034         .owner          = THIS_MODULE,
1035         .name           = "nfsd",
1036         .mount          = nfsd_mount,
1037         .kill_sb        = kill_litter_super,
1038 };
1039
1040 #ifdef CONFIG_PROC_FS
1041 static int create_proc_exports_entry(void)
1042 {
1043         struct proc_dir_entry *entry;
1044
1045         entry = proc_mkdir("fs/nfs", NULL);
1046         if (!entry)
1047                 return -ENOMEM;
1048         entry = proc_create("exports", 0, entry, &exports_operations);
1049         if (!entry)
1050                 return -ENOMEM;
1051         return 0;
1052 }
1053 #else /* CONFIG_PROC_FS */
1054 static int create_proc_exports_entry(void)
1055 {
1056         return 0;
1057 }
1058 #endif
1059
1060 int nfsd_net_id;
1061
1062 static __net_init int nfsd_init_net(struct net *net)
1063 {
1064         int retval;
1065         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1066
1067         retval = nfsd_export_init(net);
1068         if (retval)
1069                 goto out_export_error;
1070         retval = nfsd_idmap_init(net);
1071         if (retval)
1072                 goto out_idmap_error;
1073         nn->nfsd4_lease = 90;   /* default lease time */
1074         nn->nfsd4_grace = 90;
1075         return 0;
1076
1077 out_idmap_error:
1078         nfsd_export_shutdown(net);
1079 out_export_error:
1080         return retval;
1081 }
1082
1083 static __net_exit void nfsd_exit_net(struct net *net)
1084 {
1085         nfsd_idmap_shutdown(net);
1086         nfsd_export_shutdown(net);
1087 }
1088
1089 static struct pernet_operations nfsd_net_ops = {
1090         .init = nfsd_init_net,
1091         .exit = nfsd_exit_net,
1092         .id   = &nfsd_net_id,
1093         .size = sizeof(struct nfsd_net),
1094 };
1095
1096 static int __init init_nfsd(void)
1097 {
1098         int retval;
1099         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1100
1101         retval = register_cld_notifier();
1102         if (retval)
1103                 return retval;
1104         retval = register_pernet_subsys(&nfsd_net_ops);
1105         if (retval < 0)
1106                 goto out_unregister_notifier;
1107         retval = nfsd4_init_slabs();
1108         if (retval)
1109                 goto out_unregister_pernet;
1110         nfs4_state_init();
1111         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1112         if (retval)
1113                 goto out_free_slabs;
1114         nfsd_stat_init();       /* Statistics */
1115         retval = nfsd_reply_cache_init();
1116         if (retval)
1117                 goto out_free_stat;
1118         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1119         retval = create_proc_exports_entry();
1120         if (retval)
1121                 goto out_free_lockd;
1122         retval = register_filesystem(&nfsd_fs_type);
1123         if (retval)
1124                 goto out_free_all;
1125         return 0;
1126 out_free_all:
1127         remove_proc_entry("fs/nfs/exports", NULL);
1128         remove_proc_entry("fs/nfs", NULL);
1129 out_free_lockd:
1130         nfsd_lockd_shutdown();
1131         nfsd_reply_cache_shutdown();
1132 out_free_stat:
1133         nfsd_stat_shutdown();
1134         nfsd_fault_inject_cleanup();
1135 out_free_slabs:
1136         nfsd4_free_slabs();
1137 out_unregister_pernet:
1138         unregister_pernet_subsys(&nfsd_net_ops);
1139 out_unregister_notifier:
1140         unregister_cld_notifier();
1141         return retval;
1142 }
1143
1144 static void __exit exit_nfsd(void)
1145 {
1146         nfsd_reply_cache_shutdown();
1147         remove_proc_entry("fs/nfs/exports", NULL);
1148         remove_proc_entry("fs/nfs", NULL);
1149         nfsd_stat_shutdown();
1150         nfsd_lockd_shutdown();
1151         nfsd4_free_slabs();
1152         nfsd_fault_inject_cleanup();
1153         unregister_filesystem(&nfsd_fs_type);
1154         unregister_pernet_subsys(&nfsd_net_ops);
1155         unregister_cld_notifier();
1156 }
1157
1158 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1159 MODULE_LICENSE("GPL");
1160 module_init(init_nfsd)
1161 module_exit(exit_nfsd)