fs/nfsd/nfsctl.c

   1 /*
   2  * Syscall interface to knfsd.
   3  *
   4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/namei.h>
   9 #include <linux/ctype.h>
  10
  11 #include <linux/sunrpc/svcsock.h>
  12 #include <linux/lockd/lockd.h>
  13 #include <linux/sunrpc/clnt.h>
  14 #include <linux/sunrpc/gss_api.h>
  15 #include <linux/sunrpc/gss_krb5_enctypes.h>
  16 #include <linux/sunrpc/rpc_pipe_fs.h>
  17 #include <linux/module.h>
  18
  19 #include "idmap.h"
  20 #include "nfsd.h"
  21 #include "cache.h"
  22 #include "fault_inject.h"
  23 #include "netns.h"
  24
  25 /*
  26  *      We have a single directory with several nodes in it.
  27  */
  28 enum {
  29         NFSD_Root = 1,
  30         NFSD_List,
  31         NFSD_Export_features,
  32         NFSD_Fh,
  33         NFSD_FO_UnlockIP,
  34         NFSD_FO_UnlockFS,
  35         NFSD_Threads,
  36         NFSD_Pool_Threads,
  37         NFSD_Pool_Stats,
  38         NFSD_Versions,
  39         NFSD_Ports,
  40         NFSD_MaxBlkSize,
  41         NFSD_SupportedEnctypes,
  42         /*
  43          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  44          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  45          */
  46 #ifdef CONFIG_NFSD_V4
  47         NFSD_Leasetime,
  48         NFSD_Gracetime,
  49         NFSD_RecoveryDir,
  50 #endif
  51 };
  52
  53 /*
  54  * write() for these nodes.
  55  */
  56 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  57 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  58 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  59 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  60 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  61 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  62 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  63 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  64 #ifdef CONFIG_NFSD_V4
  65 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  66 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  67 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  68 #endif
  69
  70 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  71         [NFSD_Fh] = write_filehandle,
  72         [NFSD_FO_UnlockIP] = write_unlock_ip,
  73         [NFSD_FO_UnlockFS] = write_unlock_fs,
  74         [NFSD_Threads] = write_threads,
  75         [NFSD_Pool_Threads] = write_pool_threads,
  76         [NFSD_Versions] = write_versions,
  77         [NFSD_Ports] = write_ports,
  78         [NFSD_MaxBlkSize] = write_maxblksize,
  79 #ifdef CONFIG_NFSD_V4
  80         [NFSD_Leasetime] = write_leasetime,
  81         [NFSD_Gracetime] = write_gracetime,
  82         [NFSD_RecoveryDir] = write_recoverydir,
  83 #endif
  84 };
  85
  86 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  87 {
  88         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
  89         char *data;
  90         ssize_t rv;
  91
  92         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
  93                 return -EINVAL;
  94
  95         data = simple_transaction_get(file, buf, size);
  96         if (IS_ERR(data))
  97                 return PTR_ERR(data);
  98
  99         rv =  write_op[ino](file, data, size);
 100         if (rv >= 0) {
 101                 simple_transaction_set(file, rv);
 102                 rv = size;
 103         }
 104         return rv;
 105 }
 106
 107 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 108 {
 109         if (! file->private_data) {
 110                 /* An attempt to read a transaction file without writing
 111                  * causes a 0-byte write so that the file can return
 112                  * state information
 113                  */
 114                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 115                 if (rv < 0)
 116                         return rv;
 117         }
 118         return simple_transaction_read(file, buf, size, pos);
 119 }
 120
 121 static const struct file_operations transaction_ops = {
 122         .write          = nfsctl_transaction_write,
 123         .read           = nfsctl_transaction_read,
 124         .release        = simple_transaction_release,
 125         .llseek         = default_llseek,
 126 };
 127
 128 static int exports_open(struct inode *inode, struct file *file)
 129 {
 130         int err;
 131         struct seq_file *seq;
 132
 133         err = seq_open(file, &nfs_exports_op);
 134         if (err)
 135                 return err;
 136
 137         seq = file->private_data;
 138         seq->private = &svc_export_cache;
 139         return 0;
 140 }
 141
 142 static const struct file_operations exports_operations = {
 143         .open           = exports_open,
 144         .read           = seq_read,
 145         .llseek         = seq_lseek,
 146         .release        = seq_release,
 147         .owner          = THIS_MODULE,
 148 };
 149
 150 static int export_features_show(struct seq_file *m, void *v)
 151 {
 152         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 153         return 0;
 154 }
 155
 156 static int export_features_open(struct inode *inode, struct file *file)
 157 {
 158         return single_open(file, export_features_show, NULL);
 159 }
 160
 161 static struct file_operations export_features_operations = {
 162         .open           = export_features_open,
 163         .read           = seq_read,
 164         .llseek         = seq_lseek,
 165         .release        = single_release,
 166 };
 167
 168 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 169 static int supported_enctypes_show(struct seq_file *m, void *v)
 170 {
 171         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 172         return 0;
 173 }
 174
 175 static int supported_enctypes_open(struct inode *inode, struct file *file)
 176 {
 177         return single_open(file, supported_enctypes_show, NULL);
 178 }
 179
 180 static struct file_operations supported_enctypes_ops = {
 181         .open           = supported_enctypes_open,
 182         .read           = seq_read,
 183         .llseek         = seq_lseek,
 184         .release        = single_release,
 185 };
 186 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 187
 188 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 189 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 190
 191 static const struct file_operations pool_stats_operations = {
 192         .open           = nfsd_pool_stats_open,
 193         .read           = seq_read,
 194         .llseek         = seq_lseek,
 195         .release        = nfsd_pool_stats_release,
 196         .owner          = THIS_MODULE,
 197 };
 198
 199 /*----------------------------------------------------------------------------*/
 200 /*
 201  * payload - write methods
 202  */
 203
 204
 205 /**
 206  * write_unlock_ip - Release all locks used by a client
 207  *
 208  * Experimental.
 209  *
 210  * Input:
 211  *                      buf:    '\n'-terminated C string containing a
 212  *                              presentation format IP address
 213  *                      size:   length of C string in @buf
 214  * Output:
 215  *      On success:     returns zero if all specified locks were released;
 216  *                      returns one if one or more locks were not released
 217  *      On error:       return code is negative errno value
 218  */
 219 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 220 {
 221         struct sockaddr_storage address;
 222         struct sockaddr *sap = (struct sockaddr *)&address;
 223         size_t salen = sizeof(address);
 224         char *fo_path;
 225
 226         /* sanity check */
 227         if (size == 0)
 228                 return -EINVAL;
 229
 230         if (buf[size-1] != '\n')
 231                 return -EINVAL;
 232
 233         fo_path = buf;
 234         if (qword_get(&buf, fo_path, size) < 0)
 235                 return -EINVAL;
 236
 237         if (rpc_pton(&init_net, fo_path, size, sap, salen) == 0)
 238                 return -EINVAL;
 239
 240         return nlmsvc_unlock_all_by_ip(sap);
 241 }
 242
 243 /**
 244  * write_unlock_fs - Release all locks on a local file system
 245  *
 246  * Experimental.
 247  *
 248  * Input:
 249  *                      buf:    '\n'-terminated C string containing the
 250  *                              absolute pathname of a local file system
 251  *                      size:   length of C string in @buf
 252  * Output:
 253  *      On success:     returns zero if all specified locks were released;
 254  *                      returns one if one or more locks were not released
 255  *      On error:       return code is negative errno value
 256  */
 257 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 258 {
 259         struct path path;
 260         char *fo_path;
 261         int error;
 262
 263         /* sanity check */
 264         if (size == 0)
 265                 return -EINVAL;
 266
 267         if (buf[size-1] != '\n')
 268                 return -EINVAL;
 269
 270         fo_path = buf;
 271         if (qword_get(&buf, fo_path, size) < 0)
 272                 return -EINVAL;
 273
 274         error = kern_path(fo_path, 0, &path);
 275         if (error)
 276                 return error;
 277
 278         /*
 279          * XXX: Needs better sanity checking.  Otherwise we could end up
 280          * releasing locks on the wrong file system.
 281          *
 282          * For example:
 283          * 1.  Does the path refer to a directory?
 284          * 2.  Is that directory a mount point, or
 285          * 3.  Is that directory the root of an exported file system?
 286          */
 287         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 288
 289         path_put(&path);
 290         return error;
 291 }
 292
 293 /**
 294  * write_filehandle - Get a variable-length NFS file handle by path
 295  *
 296  * On input, the buffer contains a '\n'-terminated C string comprised of
 297  * three alphanumeric words separated by whitespace.  The string may
 298  * contain escape sequences.
 299  *
 300  * Input:
 301  *                      buf:
 302  *                              domain:         client domain name
 303  *                              path:           export pathname
 304  *                              maxsize:        numeric maximum size of
 305  *                                              @buf
 306  *                      size:   length of C string in @buf
 307  * Output:
 308  *      On success:     passed-in buffer filled with '\n'-terminated C
 309  *                      string containing a ASCII hex text version
 310  *                      of the NFS file handle;
 311  *                      return code is the size in bytes of the string
 312  *      On error:       return code is negative errno value
 313  */
 314 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 315 {
 316         char *dname, *path;
 317         int uninitialized_var(maxsize);
 318         char *mesg = buf;
 319         int len;
 320         struct auth_domain *dom;
 321         struct knfsd_fh fh;
 322
 323         if (size == 0)
 324                 return -EINVAL;
 325
 326         if (buf[size-1] != '\n')
 327                 return -EINVAL;
 328         buf[size-1] = 0;
 329
 330         dname = mesg;
 331         len = qword_get(&mesg, dname, size);
 332         if (len <= 0)
 333                 return -EINVAL;
 334
 335         path = dname+len+1;
 336         len = qword_get(&mesg, path, size);
 337         if (len <= 0)
 338                 return -EINVAL;
 339
 340         len = get_int(&mesg, &maxsize);
 341         if (len)
 342                 return len;
 343
 344         if (maxsize < NFS_FHSIZE)
 345                 return -EINVAL;
 346         if (maxsize > NFS3_FHSIZE)
 347                 maxsize = NFS3_FHSIZE;
 348
 349         if (qword_get(&mesg, mesg, size)>0)
 350                 return -EINVAL;
 351
 352         /* we have all the words, they are in buf.. */
 353         dom = unix_domain_find(dname);
 354         if (!dom)
 355                 return -ENOMEM;
 356
 357         len = exp_rootfh(dom, path, &fh,  maxsize);
 358         auth_domain_put(dom);
 359         if (len)
 360                 return len;
 361
 362         mesg = buf;
 363         len = SIMPLE_TRANSACTION_LIMIT;
 364         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 365         mesg[-1] = '\n';
 366         return mesg - buf;
 367 }
 368
 369 /**
 370  * write_threads - Start NFSD, or report the current number of running threads
 371  *
 372  * Input:
 373  *                      buf:            ignored
 374  *                      size:           zero
 375  * Output:
 376  *      On success:     passed-in buffer filled with '\n'-terminated C
 377  *                      string numeric value representing the number of
 378  *                      running NFSD threads;
 379  *                      return code is the size in bytes of the string
 380  *      On error:       return code is zero
 381  *
 382  * OR
 383  *
 384  * Input:
 385  *                      buf:            C string containing an unsigned
 386  *                                      integer value representing the
 387  *                                      number of NFSD threads to start
 388  *                      size:           non-zero length of C string in @buf
 389  * Output:
 390  *      On success:     NFS service is started;
 391  *                      passed-in buffer filled with '\n'-terminated C
 392  *                      string numeric value representing the number of
 393  *                      running NFSD threads;
 394  *                      return code is the size in bytes of the string
 395  *      On error:       return code is zero or a negative errno value
 396  */
 397 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 398 {
 399         char *mesg = buf;
 400         int rv;
 401         if (size > 0) {
 402                 int newthreads;
 403                 rv = get_int(&mesg, &newthreads);
 404                 if (rv)
 405                         return rv;
 406                 if (newthreads < 0)
 407                         return -EINVAL;
 408                 rv = nfsd_svc(NFS_PORT, newthreads);
 409                 if (rv < 0)
 410                         return rv;
 411         } else
 412                 rv = nfsd_nrthreads();
 413
 414         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 415 }
 416
 417 /**
 418  * write_pool_threads - Set or report the current number of threads per pool
 419  *
 420  * Input:
 421  *                      buf:            ignored
 422  *                      size:           zero
 423  *
 424  * OR
 425  *
 426  * Input:
 427  *                      buf:            C string containing whitespace-
 428  *                                      separated unsigned integer values
 429  *                                      representing the number of NFSD
 430  *                                      threads to start in each pool
 431  *                      size:           non-zero length of C string in @buf
 432  * Output:
 433  *      On success:     passed-in buffer filled with '\n'-terminated C
 434  *                      string containing integer values representing the
 435  *                      number of NFSD threads in each pool;
 436  *                      return code is the size in bytes of the string
 437  *      On error:       return code is zero or a negative errno value
 438  */
 439 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 440 {
 441         /* if size > 0, look for an array of number of threads per node
 442          * and apply them  then write out number of threads per node as reply
 443          */
 444         char *mesg = buf;
 445         int i;
 446         int rv;
 447         int len;
 448         int npools;
 449         int *nthreads;
 450
 451         mutex_lock(&nfsd_mutex);
 452         npools = nfsd_nrpools();
 453         if (npools == 0) {
 454                 /*
 455                  * NFS is shut down.  The admin can start it by
 456                  * writing to the threads file but NOT the pool_threads
 457                  * file, sorry.  Report zero threads.
 458                  */
 459                 mutex_unlock(&nfsd_mutex);
 460                 strcpy(buf, "0\n");
 461                 return strlen(buf);
 462         }
 463
 464         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 465         rv = -ENOMEM;
 466         if (nthreads == NULL)
 467                 goto out_free;
 468
 469         if (size > 0) {
 470                 for (i = 0; i < npools; i++) {
 471                         rv = get_int(&mesg, &nthreads[i]);
 472                         if (rv == -ENOENT)
 473                                 break;          /* fewer numbers than pools */
 474                         if (rv)
 475                                 goto out_free;  /* syntax error */
 476                         rv = -EINVAL;
 477                         if (nthreads[i] < 0)
 478                                 goto out_free;
 479                 }
 480                 rv = nfsd_set_nrthreads(i, nthreads);
 481                 if (rv)
 482                         goto out_free;
 483         }
 484
 485         rv = nfsd_get_nrthreads(npools, nthreads);
 486         if (rv)
 487                 goto out_free;
 488
 489         mesg = buf;
 490         size = SIMPLE_TRANSACTION_LIMIT;
 491         for (i = 0; i < npools && size > 0; i++) {
 492                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 493                 len = strlen(mesg);
 494                 size -= len;
 495                 mesg += len;
 496         }
 497         rv = mesg - buf;
 498 out_free:
 499         kfree(nthreads);
 500         mutex_unlock(&nfsd_mutex);
 501         return rv;
 502 }
 503
 504 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 505 {
 506         char *mesg = buf;
 507         char *vers, *minorp, sign;
 508         int len, num, remaining;
 509         unsigned minor;
 510         ssize_t tlen = 0;
 511         char *sep;
 512
 513         if (size>0) {
 514                 if (nfsd_serv)
 515                         /* Cannot change versions without updating
 516                          * nfsd_serv->sv_xdrsize, and reallocing
 517                          * rq_argp and rq_resp
 518                          */
 519                         return -EBUSY;
 520                 if (buf[size-1] != '\n')
 521                         return -EINVAL;
 522                 buf[size-1] = 0;
 523
 524                 vers = mesg;
 525                 len = qword_get(&mesg, vers, size);
 526                 if (len <= 0) return -EINVAL;
 527                 do {
 528                         sign = *vers;
 529                         if (sign == '+' || sign == '-')
 530                                 num = simple_strtol((vers+1), &minorp, 0);
 531                         else
 532                                 num = simple_strtol(vers, &minorp, 0);
 533                         if (*minorp == '.') {
 534                                 if (num < 4)
 535                                         return -EINVAL;
 536                                 minor = simple_strtoul(minorp+1, NULL, 0);
 537                                 if (minor == 0)
 538                                         return -EINVAL;
 539                                 if (nfsd_minorversion(minor, sign == '-' ?
 540                                                      NFSD_CLEAR : NFSD_SET) < 0)
 541                                         return -EINVAL;
 542                                 goto next;
 543                         }
 544                         switch(num) {
 545                         case 2:
 546                         case 3:
 547                         case 4:
 548                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 549                                 break;
 550                         default:
 551                                 return -EINVAL;
 552                         }
 553                 next:
 554                         vers += len + 1;
 555                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 556                 /* If all get turned off, turn them back on, as
 557                  * having no versions is BAD
 558                  */
 559                 nfsd_reset_versions();
 560         }
 561
 562         /* Now write current state into reply buffer */
 563         len = 0;
 564         sep = "";
 565         remaining = SIMPLE_TRANSACTION_LIMIT;
 566         for (num=2 ; num <= 4 ; num++)
 567                 if (nfsd_vers(num, NFSD_AVAIL)) {
 568                         len = snprintf(buf, remaining, "%s%c%d", sep,
 569                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 570                                        num);
 571                         sep = " ";
 572
 573                         if (len > remaining)
 574                                 break;
 575                         remaining -= len;
 576                         buf += len;
 577                         tlen += len;
 578                 }
 579         if (nfsd_vers(4, NFSD_AVAIL))
 580                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 581                      minor++) {
 582                         len = snprintf(buf, remaining, " %c4.%u",
 583                                         (nfsd_vers(4, NFSD_TEST) &&
 584                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 585                                                 '+' : '-',
 586                                         minor);
 587
 588                         if (len > remaining)
 589                                 break;
 590                         remaining -= len;
 591                         buf += len;
 592                         tlen += len;
 593                 }
 594
 595         len = snprintf(buf, remaining, "\n");
 596         if (len > remaining)
 597                 return -EINVAL;
 598         return tlen + len;
 599 }
 600
 601 /**
 602  * write_versions - Set or report the available NFS protocol versions
 603  *
 604  * Input:
 605  *                      buf:            ignored
 606  *                      size:           zero
 607  * Output:
 608  *      On success:     passed-in buffer filled with '\n'-terminated C
 609  *                      string containing positive or negative integer
 610  *                      values representing the current status of each
 611  *                      protocol version;
 612  *                      return code is the size in bytes of the string
 613  *      On error:       return code is zero or a negative errno value
 614  *
 615  * OR
 616  *
 617  * Input:
 618  *                      buf:            C string containing whitespace-
 619  *                                      separated positive or negative
 620  *                                      integer values representing NFS
 621  *                                      protocol versions to enable ("+n")
 622  *                                      or disable ("-n")
 623  *                      size:           non-zero length of C string in @buf
 624  * Output:
 625  *      On success:     status of zero or more protocol versions has
 626  *                      been updated; passed-in buffer filled with
 627  *                      '\n'-terminated C string containing positive
 628  *                      or negative integer values representing the
 629  *                      current status of each protocol version;
 630  *                      return code is the size in bytes of the string
 631  *      On error:       return code is zero or a negative errno value
 632  */
 633 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 634 {
 635         ssize_t rv;
 636
 637         mutex_lock(&nfsd_mutex);
 638         rv = __write_versions(file, buf, size);
 639         mutex_unlock(&nfsd_mutex);
 640         return rv;
 641 }
 642
 643 /*
 644  * Zero-length write.  Return a list of NFSD's current listener
 645  * transports.
 646  */
 647 static ssize_t __write_ports_names(char *buf)
 648 {
 649         if (nfsd_serv == NULL)
 650                 return 0;
 651         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 652 }
 653
 654 /*
 655  * A single 'fd' number was written, in which case it must be for
 656  * a socket of a supported family/protocol, and we use it as an
 657  * nfsd listener.
 658  */
 659 static ssize_t __write_ports_addfd(char *buf)
 660 {
 661         char *mesg = buf;
 662         int fd, err;
 663
 664         err = get_int(&mesg, &fd);
 665         if (err != 0 || fd < 0)
 666                 return -EINVAL;
 667
 668         err = nfsd_create_serv();
 669         if (err != 0)
 670                 return err;
 671
 672         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 673         if (err < 0) {
 674                 svc_destroy(nfsd_serv);
 675                 return err;
 676         }
 677
 678         /* Decrease the count, but don't shut down the service */
 679         nfsd_serv->sv_nrthreads--;
 680         return err;
 681 }
 682
 683 /*
 684  * A '-' followed by the 'name' of a socket means we close the socket.
 685  */
 686 static ssize_t __write_ports_delfd(char *buf)
 687 {
 688         char *toclose;
 689         int len = 0;
 690
 691         toclose = kstrdup(buf + 1, GFP_KERNEL);
 692         if (toclose == NULL)
 693                 return -ENOMEM;
 694
 695         if (nfsd_serv != NULL)
 696                 len = svc_sock_names(nfsd_serv, buf,
 697                                         SIMPLE_TRANSACTION_LIMIT, toclose);
 698         kfree(toclose);
 699         return len;
 700 }
 701
 702 /*
 703  * A transport listener is added by writing it's transport name and
 704  * a port number.
 705  */
 706 static ssize_t __write_ports_addxprt(char *buf)
 707 {
 708         char transport[16];
 709         struct svc_xprt *xprt;
 710         int port, err;
 711
 712         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 713                 return -EINVAL;
 714
 715         if (port < 1 || port > USHRT_MAX)
 716                 return -EINVAL;
 717
 718         err = nfsd_create_serv();
 719         if (err != 0)
 720                 return err;
 721
 722         err = svc_create_xprt(nfsd_serv, transport, &init_net,
 723                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 724         if (err < 0)
 725                 goto out_err;
 726
 727         err = svc_create_xprt(nfsd_serv, transport, &init_net,
 728                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
 729         if (err < 0 && err != -EAFNOSUPPORT)
 730                 goto out_close;
 731
 732         /* Decrease the count, but don't shut down the service */
 733         nfsd_serv->sv_nrthreads--;
 734         return 0;
 735 out_close:
 736         xprt = svc_find_xprt(nfsd_serv, transport, &init_net, PF_INET, port);
 737         if (xprt != NULL) {
 738                 svc_close_xprt(xprt);
 739                 svc_xprt_put(xprt);
 740         }
 741 out_err:
 742         svc_destroy(nfsd_serv);
 743         return err;
 744 }
 745
 746 /*
 747  * A transport listener is removed by writing a "-", it's transport
 748  * name, and it's port number.
 749  */
 750 static ssize_t __write_ports_delxprt(char *buf)
 751 {
 752         struct svc_xprt *xprt;
 753         char transport[16];
 754         int port;
 755
 756         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
 757                 return -EINVAL;
 758
 759         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
 760                 return -EINVAL;
 761
 762         xprt = svc_find_xprt(nfsd_serv, transport, &init_net, AF_UNSPEC, port);
 763         if (xprt == NULL)
 764                 return -ENOTCONN;
 765
 766         svc_close_xprt(xprt);
 767         svc_xprt_put(xprt);
 768         return 0;
 769 }
 770
 771 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 772 {
 773         if (size == 0)
 774                 return __write_ports_names(buf);
 775
 776         if (isdigit(buf[0]))
 777                 return __write_ports_addfd(buf);
 778
 779         if (buf[0] == '-' && isdigit(buf[1]))
 780                 return __write_ports_delfd(buf);
 781
 782         if (isalpha(buf[0]))
 783                 return __write_ports_addxprt(buf);
 784
 785         if (buf[0] == '-' && isalpha(buf[1]))
 786                 return __write_ports_delxprt(buf);
 787
 788         return -EINVAL;
 789 }
 790
 791 /**
 792  * write_ports - Pass a socket file descriptor or transport name to listen on
 793  *
 794  * Input:
 795  *                      buf:            ignored
 796  *                      size:           zero
 797  * Output:
 798  *      On success:     passed-in buffer filled with a '\n'-terminated C
 799  *                      string containing a whitespace-separated list of
 800  *                      named NFSD listeners;
 801  *                      return code is the size in bytes of the string
 802  *      On error:       return code is zero or a negative errno value
 803  *
 804  * OR
 805  *
 806  * Input:
 807  *                      buf:            C string containing an unsigned
 808  *                                      integer value representing a bound
 809  *                                      but unconnected socket that is to be
 810  *                                      used as an NFSD listener; listen(3)
 811  *                                      must be called for a SOCK_STREAM
 812  *                                      socket, otherwise it is ignored
 813  *                      size:           non-zero length of C string in @buf
 814  * Output:
 815  *      On success:     NFS service is started;
 816  *                      passed-in buffer filled with a '\n'-terminated C
 817  *                      string containing a unique alphanumeric name of
 818  *                      the listener;
 819  *                      return code is the size in bytes of the string
 820  *      On error:       return code is a negative errno value
 821  *
 822  * OR
 823  *
 824  * Input:
 825  *                      buf:            C string containing a "-" followed
 826  *                                      by an integer value representing a
 827  *                                      previously passed in socket file
 828  *                                      descriptor
 829  *                      size:           non-zero length of C string in @buf
 830  * Output:
 831  *      On success:     NFS service no longer listens on that socket;
 832  *                      passed-in buffer filled with a '\n'-terminated C
 833  *                      string containing a unique name of the listener;
 834  *                      return code is the size in bytes of the string
 835  *      On error:       return code is a negative errno value
 836  *
 837  * OR
 838  *
 839  * Input:
 840  *                      buf:            C string containing a transport
 841  *                                      name and an unsigned integer value
 842  *                                      representing the port to listen on,
 843  *                                      separated by whitespace
 844  *                      size:           non-zero length of C string in @buf
 845  * Output:
 846  *      On success:     returns zero; NFS service is started
 847  *      On error:       return code is a negative errno value
 848  *
 849  * OR
 850  *
 851  * Input:
 852  *                      buf:            C string containing a "-" followed
 853  *                                      by a transport name and an unsigned
 854  *                                      integer value representing the port
 855  *                                      to listen on, separated by whitespace
 856  *                      size:           non-zero length of C string in @buf
 857  * Output:
 858  *      On success:     returns zero; NFS service no longer listens
 859  *                      on that transport
 860  *      On error:       return code is a negative errno value
 861  */
 862 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 863 {
 864         ssize_t rv;
 865
 866         mutex_lock(&nfsd_mutex);
 867         rv = __write_ports(file, buf, size);
 868         mutex_unlock(&nfsd_mutex);
 869         return rv;
 870 }
 871
 872
 873 int nfsd_max_blksize;
 874
 875 /**
 876  * write_maxblksize - Set or report the current NFS blksize
 877  *
 878  * Input:
 879  *                      buf:            ignored
 880  *                      size:           zero
 881  *
 882  * OR
 883  *
 884  * Input:
 885  *                      buf:            C string containing an unsigned
 886  *                                      integer value representing the new
 887  *                                      NFS blksize
 888  *                      size:           non-zero length of C string in @buf
 889  * Output:
 890  *      On success:     passed-in buffer filled with '\n'-terminated C string
 891  *                      containing numeric value of the current NFS blksize
 892  *                      setting;
 893  *                      return code is the size in bytes of the string
 894  *      On error:       return code is zero or a negative errno value
 895  */
 896 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 897 {
 898         char *mesg = buf;
 899         if (size > 0) {
 900                 int bsize;
 901                 int rv = get_int(&mesg, &bsize);
 902                 if (rv)
 903                         return rv;
 904                 /* force bsize into allowed range and
 905                  * required alignment.
 906                  */
 907                 if (bsize < 1024)
 908                         bsize = 1024;
 909                 if (bsize > NFSSVC_MAXBLKSIZE)
 910                         bsize = NFSSVC_MAXBLKSIZE;
 911                 bsize &= ~(1024-1);
 912                 mutex_lock(&nfsd_mutex);
 913                 if (nfsd_serv) {
 914                         mutex_unlock(&nfsd_mutex);
 915                         return -EBUSY;
 916                 }
 917                 nfsd_max_blksize = bsize;
 918                 mutex_unlock(&nfsd_mutex);
 919         }
 920
 921         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 922                                                         nfsd_max_blksize);
 923 }
 924
 925 #ifdef CONFIG_NFSD_V4
 926 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 927 {
 928         char *mesg = buf;
 929         int rv, i;
 930
 931         if (size > 0) {
 932                 if (nfsd_serv)
 933                         return -EBUSY;
 934                 rv = get_int(&mesg, &i);
 935                 if (rv)
 936                         return rv;
 937                 /*
 938                  * Some sanity checking.  We don't have a reason for
 939                  * these particular numbers, but problems with the
 940                  * extremes are:
 941                  *      - Too short: the briefest network outage may
 942                  *        cause clients to lose all their locks.  Also,
 943                  *        the frequent polling may be wasteful.
 944                  *      - Too long: do you really want reboot recovery
 945                  *        to take more than an hour?  Or to make other
 946                  *        clients wait an hour before being able to
 947                  *        revoke a dead client's locks?
 948                  */
 949                 if (i < 10 || i > 3600)
 950                         return -EINVAL;
 951                 *time = i;
 952         }
 953
 954         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 955 }
 956
 957 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 958 {
 959         ssize_t rv;
 960
 961         mutex_lock(&nfsd_mutex);
 962         rv = __nfsd4_write_time(file, buf, size, time);
 963         mutex_unlock(&nfsd_mutex);
 964         return rv;
 965 }
 966
 967 /**
 968  * write_leasetime - Set or report the current NFSv4 lease time
 969  *
 970  * Input:
 971  *                      buf:            ignored
 972  *                      size:           zero
 973  *
 974  * OR
 975  *
 976  * Input:
 977  *                      buf:            C string containing an unsigned
 978  *                                      integer value representing the new
 979  *                                      NFSv4 lease expiry time
 980  *                      size:           non-zero length of C string in @buf
 981  * Output:
 982  *      On success:     passed-in buffer filled with '\n'-terminated C
 983  *                      string containing unsigned integer value of the
 984  *                      current lease expiry time;
 985  *                      return code is the size in bytes of the string
 986  *      On error:       return code is zero or a negative errno value
 987  */
 988 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 989 {
 990         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
 991 }
 992
 993 /**
 994  * write_gracetime - Set or report current NFSv4 grace period time
 995  *
 996  * As above, but sets the time of the NFSv4 grace period.
 997  *
 998  * Note this should never be set to less than the *previous*
 999  * lease-period time, but we don't try to enforce this.  (In the common
1000  * case (a new boot), we don't know what the previous lease time was
1001  * anyway.)
1002  */
1003 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1004 {
1005         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1006 }
1007
1008 extern char *nfs4_recoverydir(void);
1009
1010 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1011 {
1012         char *mesg = buf;
1013         char *recdir;
1014         int len, status;
1015
1016         if (size > 0) {
1017                 if (nfsd_serv)
1018                         return -EBUSY;
1019                 if (size > PATH_MAX || buf[size-1] != '\n')
1020                         return -EINVAL;
1021                 buf[size-1] = 0;
1022
1023                 recdir = mesg;
1024                 len = qword_get(&mesg, recdir, size);
1025                 if (len <= 0)
1026                         return -EINVAL;
1027
1028                 status = nfs4_reset_recoverydir(recdir);
1029                 if (status)
1030                         return status;
1031         }
1032
1033         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1034                                                         nfs4_recoverydir());
1035 }
1036
1037 /**
1038  * write_recoverydir - Set or report the pathname of the recovery directory
1039  *
1040  * Input:
1041  *                      buf:            ignored
1042  *                      size:           zero
1043  *
1044  * OR
1045  *
1046  * Input:
1047  *                      buf:            C string containing the pathname
1048  *                                      of the directory on a local file
1049  *                                      system containing permanent NFSv4
1050  *                                      recovery data
1051  *                      size:           non-zero length of C string in @buf
1052  * Output:
1053  *      On success:     passed-in buffer filled with '\n'-terminated C string
1054  *                      containing the current recovery pathname setting;
1055  *                      return code is the size in bytes of the string
1056  *      On error:       return code is zero or a negative errno value
1057  */
1058 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1059 {
1060         ssize_t rv;
1061
1062         mutex_lock(&nfsd_mutex);
1063         rv = __write_recoverydir(file, buf, size);
1064         mutex_unlock(&nfsd_mutex);
1065         return rv;
1066 }
1067
1068 #endif
1069
1070 /*----------------------------------------------------------------------------*/
1071 /*
1072  *      populating the filesystem.
1073  */
1074
1075 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1076 {
1077         static struct tree_descr nfsd_files[] = {
1078                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1079                 [NFSD_Export_features] = {"export_features",
1080                                         &export_features_operations, S_IRUGO},
1081                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1082                                         &transaction_ops, S_IWUSR|S_IRUSR},
1083                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1084                                         &transaction_ops, S_IWUSR|S_IRUSR},
1085                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1086                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1087                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1088                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1089                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1090                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1091                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1092 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1093                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1094 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1095 #ifdef CONFIG_NFSD_V4
1096                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1097                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1098                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1099 #endif
1100                 /* last one */ {""}
1101         };
1102         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1103 }
1104
1105 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1106         int flags, const char *dev_name, void *data)
1107 {
1108         return mount_single(fs_type, flags, data, nfsd_fill_super);
1109 }
1110
1111 static struct file_system_type nfsd_fs_type = {
1112         .owner          = THIS_MODULE,
1113         .name           = "nfsd",
1114         .mount          = nfsd_mount,
1115         .kill_sb        = kill_litter_super,
1116 };
1117
1118 #ifdef CONFIG_PROC_FS
1119 static int create_proc_exports_entry(void)
1120 {
1121         struct proc_dir_entry *entry;
1122
1123         entry = proc_mkdir("fs/nfs", NULL);
1124         if (!entry)
1125                 return -ENOMEM;
1126         entry = proc_create("exports", 0, entry, &exports_operations);
1127         if (!entry)
1128                 return -ENOMEM;
1129         return 0;
1130 }
1131 #else /* CONFIG_PROC_FS */
1132 static int create_proc_exports_entry(void)
1133 {
1134         return 0;
1135 }
1136 #endif
1137
1138 int nfsd_net_id;
1139 static struct pernet_operations nfsd_net_ops = {
1140         .id   = &nfsd_net_id,
1141         .size = sizeof(struct nfsd_net),
1142 };
1143
1144 static int __init init_nfsd(void)
1145 {
1146         int retval;
1147         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1148
1149         retval = register_cld_notifier();
1150         if (retval)
1151                 return retval;
1152         retval = register_pernet_subsys(&nfsd_net_ops);
1153         if (retval < 0)
1154                 goto out_unregister_notifier;
1155         retval = nfsd4_init_slabs();
1156         if (retval)
1157                 goto out_unregister_pernet;
1158         nfs4_state_init();
1159         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1160         if (retval)
1161                 goto out_free_slabs;
1162         nfsd_stat_init();       /* Statistics */
1163         retval = nfsd_reply_cache_init();
1164         if (retval)
1165                 goto out_free_stat;
1166         retval = nfsd_export_init();
1167         if (retval)
1168                 goto out_free_cache;
1169         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1170         retval = nfsd_idmap_init();
1171         if (retval)
1172                 goto out_free_lockd;
1173         retval = create_proc_exports_entry();
1174         if (retval)
1175                 goto out_free_idmap;
1176         retval = register_filesystem(&nfsd_fs_type);
1177         if (retval)
1178                 goto out_free_all;
1179         return 0;
1180 out_free_all:
1181         remove_proc_entry("fs/nfs/exports", NULL);
1182         remove_proc_entry("fs/nfs", NULL);
1183 out_free_idmap:
1184         nfsd_idmap_shutdown();
1185 out_free_lockd:
1186         nfsd_lockd_shutdown();
1187         nfsd_export_shutdown();
1188 out_free_cache:
1189         nfsd_reply_cache_shutdown();
1190 out_free_stat:
1191         nfsd_stat_shutdown();
1192         nfsd_fault_inject_cleanup();
1193 out_free_slabs:
1194         nfsd4_free_slabs();
1195 out_unregister_pernet:
1196         unregister_pernet_subsys(&nfsd_net_ops);
1197 out_unregister_notifier:
1198         unregister_cld_notifier();
1199         return retval;
1200 }
1201
1202 static void __exit exit_nfsd(void)
1203 {
1204         nfsd_export_shutdown();
1205         nfsd_reply_cache_shutdown();
1206         remove_proc_entry("fs/nfs/exports", NULL);
1207         remove_proc_entry("fs/nfs", NULL);
1208         nfsd_stat_shutdown();
1209         nfsd_lockd_shutdown();
1210         nfsd_idmap_shutdown();
1211         nfsd4_free_slabs();
1212         nfsd_fault_inject_cleanup();
1213         unregister_filesystem(&nfsd_fs_type);
1214         unregister_pernet_subsys(&nfsd_net_ops);
1215         unregister_cld_notifier();
1216 }
1217
1218 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1219 MODULE_LICENSE("GPL");
1220 module_init(init_nfsd)
1221 module_exit(exit_nfsd)