fs/nfsd/nfsctl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Syscall interface to knfsd.
   4  *
   5  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   6  */
   7
   8 #include <linux/slab.h>
   9 #include <linux/namei.h>
  10 #include <linux/ctype.h>
  11
  12 #include <linux/sunrpc/svcsock.h>
  13 #include <linux/lockd/lockd.h>
  14 #include <linux/sunrpc/addr.h>
  15 #include <linux/sunrpc/gss_api.h>
  16 #include <linux/sunrpc/gss_krb5_enctypes.h>
  17 #include <linux/sunrpc/rpc_pipe_fs.h>
  18 #include <linux/module.h>
  19 #include <linux/fsnotify.h>
  20
  21 #include "idmap.h"
  22 #include "nfsd.h"
  23 #include "cache.h"
  24 #include "state.h"
  25 #include "netns.h"
  26 #include "pnfs.h"
  27
  28 /*
  29  *      We have a single directory with several nodes in it.
  30  */
  31 enum {
  32         NFSD_Root = 1,
  33         NFSD_List,
  34         NFSD_Export_features,
  35         NFSD_Fh,
  36         NFSD_FO_UnlockIP,
  37         NFSD_FO_UnlockFS,
  38         NFSD_Threads,
  39         NFSD_Pool_Threads,
  40         NFSD_Pool_Stats,
  41         NFSD_Reply_Cache_Stats,
  42         NFSD_Versions,
  43         NFSD_Ports,
  44         NFSD_MaxBlkSize,
  45         NFSD_MaxConnections,
  46         NFSD_SupportedEnctypes,
  47         /*
  48          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  49          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  50          */
  51 #ifdef CONFIG_NFSD_V4
  52         NFSD_Leasetime,
  53         NFSD_Gracetime,
  54         NFSD_RecoveryDir,
  55         NFSD_V4EndGrace,
  56 #endif
  57         NFSD_MaxReserved
  58 };
  59
  60 /*
  61  * write() for these nodes.
  62  */
  63 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  64 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  65 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  66 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  67 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  68 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  69 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  70 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  71 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
  72 #ifdef CONFIG_NFSD_V4
  73 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  74 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  75 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  76 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
  77 #endif
  78
  79 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
  80         [NFSD_Fh] = write_filehandle,
  81         [NFSD_FO_UnlockIP] = write_unlock_ip,
  82         [NFSD_FO_UnlockFS] = write_unlock_fs,
  83         [NFSD_Threads] = write_threads,
  84         [NFSD_Pool_Threads] = write_pool_threads,
  85         [NFSD_Versions] = write_versions,
  86         [NFSD_Ports] = write_ports,
  87         [NFSD_MaxBlkSize] = write_maxblksize,
  88         [NFSD_MaxConnections] = write_maxconn,
  89 #ifdef CONFIG_NFSD_V4
  90         [NFSD_Leasetime] = write_leasetime,
  91         [NFSD_Gracetime] = write_gracetime,
  92         [NFSD_RecoveryDir] = write_recoverydir,
  93         [NFSD_V4EndGrace] = write_v4_end_grace,
  94 #endif
  95 };
  96
  97 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  98 {
  99         ino_t ino =  file_inode(file)->i_ino;
 100         char *data;
 101         ssize_t rv;
 102
 103         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 104                 return -EINVAL;
 105
 106         data = simple_transaction_get(file, buf, size);
 107         if (IS_ERR(data))
 108                 return PTR_ERR(data);
 109
 110         rv =  write_op[ino](file, data, size);
 111         if (rv >= 0) {
 112                 simple_transaction_set(file, rv);
 113                 rv = size;
 114         }
 115         return rv;
 116 }
 117
 118 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 119 {
 120         if (! file->private_data) {
 121                 /* An attempt to read a transaction file without writing
 122                  * causes a 0-byte write so that the file can return
 123                  * state information
 124                  */
 125                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 126                 if (rv < 0)
 127                         return rv;
 128         }
 129         return simple_transaction_read(file, buf, size, pos);
 130 }
 131
 132 static const struct file_operations transaction_ops = {
 133         .write          = nfsctl_transaction_write,
 134         .read           = nfsctl_transaction_read,
 135         .release        = simple_transaction_release,
 136         .llseek         = default_llseek,
 137 };
 138
 139 static int exports_net_open(struct net *net, struct file *file)
 140 {
 141         int err;
 142         struct seq_file *seq;
 143         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 144
 145         err = seq_open(file, &nfs_exports_op);
 146         if (err)
 147                 return err;
 148
 149         seq = file->private_data;
 150         seq->private = nn->svc_export_cache;
 151         return 0;
 152 }
 153
 154 static int exports_proc_open(struct inode *inode, struct file *file)
 155 {
 156         return exports_net_open(current->nsproxy->net_ns, file);
 157 }
 158
 159 static const struct file_operations exports_proc_operations = {
 160         .open           = exports_proc_open,
 161         .read           = seq_read,
 162         .llseek         = seq_lseek,
 163         .release        = seq_release,
 164 };
 165
 166 static int exports_nfsd_open(struct inode *inode, struct file *file)
 167 {
 168         return exports_net_open(inode->i_sb->s_fs_info, file);
 169 }
 170
 171 static const struct file_operations exports_nfsd_operations = {
 172         .open           = exports_nfsd_open,
 173         .read           = seq_read,
 174         .llseek         = seq_lseek,
 175         .release        = seq_release,
 176 };
 177
 178 static int export_features_show(struct seq_file *m, void *v)
 179 {
 180         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 181         return 0;
 182 }
 183
 184 static int export_features_open(struct inode *inode, struct file *file)
 185 {
 186         return single_open(file, export_features_show, NULL);
 187 }
 188
 189 static const struct file_operations export_features_operations = {
 190         .open           = export_features_open,
 191         .read           = seq_read,
 192         .llseek         = seq_lseek,
 193         .release        = single_release,
 194 };
 195
 196 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 197 static int supported_enctypes_show(struct seq_file *m, void *v)
 198 {
 199         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 200         return 0;
 201 }
 202
 203 static int supported_enctypes_open(struct inode *inode, struct file *file)
 204 {
 205         return single_open(file, supported_enctypes_show, NULL);
 206 }
 207
 208 static const struct file_operations supported_enctypes_ops = {
 209         .open           = supported_enctypes_open,
 210         .read           = seq_read,
 211         .llseek         = seq_lseek,
 212         .release        = single_release,
 213 };
 214 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 215
 216 static const struct file_operations pool_stats_operations = {
 217         .open           = nfsd_pool_stats_open,
 218         .read           = seq_read,
 219         .llseek         = seq_lseek,
 220         .release        = nfsd_pool_stats_release,
 221 };
 222
 223 static const struct file_operations reply_cache_stats_operations = {
 224         .open           = nfsd_reply_cache_stats_open,
 225         .read           = seq_read,
 226         .llseek         = seq_lseek,
 227         .release        = single_release,
 228 };
 229
 230 /*----------------------------------------------------------------------------*/
 231 /*
 232  * payload - write methods
 233  */
 234
 235 static inline struct net *netns(struct file *file)
 236 {
 237         return file_inode(file)->i_sb->s_fs_info;
 238 }
 239
 240 /**
 241  * write_unlock_ip - Release all locks used by a client
 242  *
 243  * Experimental.
 244  *
 245  * Input:
 246  *                      buf:    '\n'-terminated C string containing a
 247  *                              presentation format IP address
 248  *                      size:   length of C string in @buf
 249  * Output:
 250  *      On success:     returns zero if all specified locks were released;
 251  *                      returns one if one or more locks were not released
 252  *      On error:       return code is negative errno value
 253  */
 254 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 255 {
 256         struct sockaddr_storage address;
 257         struct sockaddr *sap = (struct sockaddr *)&address;
 258         size_t salen = sizeof(address);
 259         char *fo_path;
 260         struct net *net = netns(file);
 261
 262         /* sanity check */
 263         if (size == 0)
 264                 return -EINVAL;
 265
 266         if (buf[size-1] != '\n')
 267                 return -EINVAL;
 268
 269         fo_path = buf;
 270         if (qword_get(&buf, fo_path, size) < 0)
 271                 return -EINVAL;
 272
 273         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
 274                 return -EINVAL;
 275
 276         return nlmsvc_unlock_all_by_ip(sap);
 277 }
 278
 279 /**
 280  * write_unlock_fs - Release all locks on a local file system
 281  *
 282  * Experimental.
 283  *
 284  * Input:
 285  *                      buf:    '\n'-terminated C string containing the
 286  *                              absolute pathname of a local file system
 287  *                      size:   length of C string in @buf
 288  * Output:
 289  *      On success:     returns zero if all specified locks were released;
 290  *                      returns one if one or more locks were not released
 291  *      On error:       return code is negative errno value
 292  */
 293 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 294 {
 295         struct path path;
 296         char *fo_path;
 297         int error;
 298
 299         /* sanity check */
 300         if (size == 0)
 301                 return -EINVAL;
 302
 303         if (buf[size-1] != '\n')
 304                 return -EINVAL;
 305
 306         fo_path = buf;
 307         if (qword_get(&buf, fo_path, size) < 0)
 308                 return -EINVAL;
 309
 310         error = kern_path(fo_path, 0, &path);
 311         if (error)
 312                 return error;
 313
 314         /*
 315          * XXX: Needs better sanity checking.  Otherwise we could end up
 316          * releasing locks on the wrong file system.
 317          *
 318          * For example:
 319          * 1.  Does the path refer to a directory?
 320          * 2.  Is that directory a mount point, or
 321          * 3.  Is that directory the root of an exported file system?
 322          */
 323         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 324
 325         path_put(&path);
 326         return error;
 327 }
 328
 329 /**
 330  * write_filehandle - Get a variable-length NFS file handle by path
 331  *
 332  * On input, the buffer contains a '\n'-terminated C string comprised of
 333  * three alphanumeric words separated by whitespace.  The string may
 334  * contain escape sequences.
 335  *
 336  * Input:
 337  *                      buf:
 338  *                              domain:         client domain name
 339  *                              path:           export pathname
 340  *                              maxsize:        numeric maximum size of
 341  *                                              @buf
 342  *                      size:   length of C string in @buf
 343  * Output:
 344  *      On success:     passed-in buffer filled with '\n'-terminated C
 345  *                      string containing a ASCII hex text version
 346  *                      of the NFS file handle;
 347  *                      return code is the size in bytes of the string
 348  *      On error:       return code is negative errno value
 349  */
 350 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 351 {
 352         char *dname, *path;
 353         int uninitialized_var(maxsize);
 354         char *mesg = buf;
 355         int len;
 356         struct auth_domain *dom;
 357         struct knfsd_fh fh;
 358
 359         if (size == 0)
 360                 return -EINVAL;
 361
 362         if (buf[size-1] != '\n')
 363                 return -EINVAL;
 364         buf[size-1] = 0;
 365
 366         dname = mesg;
 367         len = qword_get(&mesg, dname, size);
 368         if (len <= 0)
 369                 return -EINVAL;
 370
 371         path = dname+len+1;
 372         len = qword_get(&mesg, path, size);
 373         if (len <= 0)
 374                 return -EINVAL;
 375
 376         len = get_int(&mesg, &maxsize);
 377         if (len)
 378                 return len;
 379
 380         if (maxsize < NFS_FHSIZE)
 381                 return -EINVAL;
 382         maxsize = min(maxsize, NFS3_FHSIZE);
 383
 384         if (qword_get(&mesg, mesg, size)>0)
 385                 return -EINVAL;
 386
 387         /* we have all the words, they are in buf.. */
 388         dom = unix_domain_find(dname);
 389         if (!dom)
 390                 return -ENOMEM;
 391
 392         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
 393         auth_domain_put(dom);
 394         if (len)
 395                 return len;
 396
 397         mesg = buf;
 398         len = SIMPLE_TRANSACTION_LIMIT;
 399         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 400         mesg[-1] = '\n';
 401         return mesg - buf;
 402 }
 403
 404 /**
 405  * write_threads - Start NFSD, or report the current number of running threads
 406  *
 407  * Input:
 408  *                      buf:            ignored
 409  *                      size:           zero
 410  * Output:
 411  *      On success:     passed-in buffer filled with '\n'-terminated C
 412  *                      string numeric value representing the number of
 413  *                      running NFSD threads;
 414  *                      return code is the size in bytes of the string
 415  *      On error:       return code is zero
 416  *
 417  * OR
 418  *
 419  * Input:
 420  *                      buf:            C string containing an unsigned
 421  *                                      integer value representing the
 422  *                                      number of NFSD threads to start
 423  *                      size:           non-zero length of C string in @buf
 424  * Output:
 425  *      On success:     NFS service is started;
 426  *                      passed-in buffer filled with '\n'-terminated C
 427  *                      string numeric value representing the number of
 428  *                      running NFSD threads;
 429  *                      return code is the size in bytes of the string
 430  *      On error:       return code is zero or a negative errno value
 431  */
 432 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 433 {
 434         char *mesg = buf;
 435         int rv;
 436         struct net *net = netns(file);
 437
 438         if (size > 0) {
 439                 int newthreads;
 440                 rv = get_int(&mesg, &newthreads);
 441                 if (rv)
 442                         return rv;
 443                 if (newthreads < 0)
 444                         return -EINVAL;
 445                 rv = nfsd_svc(newthreads, net, file->f_cred);
 446                 if (rv < 0)
 447                         return rv;
 448         } else
 449                 rv = nfsd_nrthreads(net);
 450
 451         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 452 }
 453
 454 /**
 455  * write_pool_threads - Set or report the current number of threads per pool
 456  *
 457  * Input:
 458  *                      buf:            ignored
 459  *                      size:           zero
 460  *
 461  * OR
 462  *
 463  * Input:
 464  *                      buf:            C string containing whitespace-
 465  *                                      separated unsigned integer values
 466  *                                      representing the number of NFSD
 467  *                                      threads to start in each pool
 468  *                      size:           non-zero length of C string in @buf
 469  * Output:
 470  *      On success:     passed-in buffer filled with '\n'-terminated C
 471  *                      string containing integer values representing the
 472  *                      number of NFSD threads in each pool;
 473  *                      return code is the size in bytes of the string
 474  *      On error:       return code is zero or a negative errno value
 475  */
 476 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 477 {
 478         /* if size > 0, look for an array of number of threads per node
 479          * and apply them  then write out number of threads per node as reply
 480          */
 481         char *mesg = buf;
 482         int i;
 483         int rv;
 484         int len;
 485         int npools;
 486         int *nthreads;
 487         struct net *net = netns(file);
 488
 489         mutex_lock(&nfsd_mutex);
 490         npools = nfsd_nrpools(net);
 491         if (npools == 0) {
 492                 /*
 493                  * NFS is shut down.  The admin can start it by
 494                  * writing to the threads file but NOT the pool_threads
 495                  * file, sorry.  Report zero threads.
 496                  */
 497                 mutex_unlock(&nfsd_mutex);
 498                 strcpy(buf, "0\n");
 499                 return strlen(buf);
 500         }
 501
 502         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 503         rv = -ENOMEM;
 504         if (nthreads == NULL)
 505                 goto out_free;
 506
 507         if (size > 0) {
 508                 for (i = 0; i < npools; i++) {
 509                         rv = get_int(&mesg, &nthreads[i]);
 510                         if (rv == -ENOENT)
 511                                 break;          /* fewer numbers than pools */
 512                         if (rv)
 513                                 goto out_free;  /* syntax error */
 514                         rv = -EINVAL;
 515                         if (nthreads[i] < 0)
 516                                 goto out_free;
 517                 }
 518                 rv = nfsd_set_nrthreads(i, nthreads, net);
 519                 if (rv)
 520                         goto out_free;
 521         }
 522
 523         rv = nfsd_get_nrthreads(npools, nthreads, net);
 524         if (rv)
 525                 goto out_free;
 526
 527         mesg = buf;
 528         size = SIMPLE_TRANSACTION_LIMIT;
 529         for (i = 0; i < npools && size > 0; i++) {
 530                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 531                 len = strlen(mesg);
 532                 size -= len;
 533                 mesg += len;
 534         }
 535         rv = mesg - buf;
 536 out_free:
 537         kfree(nthreads);
 538         mutex_unlock(&nfsd_mutex);
 539         return rv;
 540 }
 541
 542 static ssize_t
 543 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
 544                 const char *sep, unsigned vers, int minor)
 545 {
 546         const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
 547         bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
 548
 549         if (vers == 4 && minor >= 0 &&
 550             !nfsd_minorversion(nn, minor, NFSD_TEST))
 551                 supported = false;
 552         if (minor == 0 && supported)
 553                 /*
 554                  * special case for backward compatability.
 555                  * +4.0 is never reported, it is implied by
 556                  * +4, unless -4.0 is present.
 557                  */
 558                 return 0;
 559         return snprintf(buf, remaining, format, sep,
 560                         supported ? '+' : '-', vers, minor);
 561 }
 562
 563 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 564 {
 565         char *mesg = buf;
 566         char *vers, *minorp, sign;
 567         int len, num, remaining;
 568         ssize_t tlen = 0;
 569         char *sep;
 570         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 571
 572         if (size>0) {
 573                 if (nn->nfsd_serv)
 574                         /* Cannot change versions without updating
 575                          * nn->nfsd_serv->sv_xdrsize, and reallocing
 576                          * rq_argp and rq_resp
 577                          */
 578                         return -EBUSY;
 579                 if (buf[size-1] != '\n')
 580                         return -EINVAL;
 581                 buf[size-1] = 0;
 582
 583                 vers = mesg;
 584                 len = qword_get(&mesg, vers, size);
 585                 if (len <= 0) return -EINVAL;
 586                 do {
 587                         enum vers_op cmd;
 588                         unsigned minor;
 589                         sign = *vers;
 590                         if (sign == '+' || sign == '-')
 591                                 num = simple_strtol((vers+1), &minorp, 0);
 592                         else
 593                                 num = simple_strtol(vers, &minorp, 0);
 594                         if (*minorp == '.') {
 595                                 if (num != 4)
 596                                         return -EINVAL;
 597                                 if (kstrtouint(minorp+1, 0, &minor) < 0)
 598                                         return -EINVAL;
 599                         }
 600
 601                         cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
 602                         switch(num) {
 603                         case 2:
 604                         case 3:
 605                                 nfsd_vers(nn, num, cmd);
 606                                 break;
 607                         case 4:
 608                                 if (*minorp == '.') {
 609                                         if (nfsd_minorversion(nn, minor, cmd) < 0)
 610                                                 return -EINVAL;
 611                                 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
 612                                         /*
 613                                          * Either we have +4 and no minors are enabled,
 614                                          * or we have -4 and at least one minor is enabled.
 615                                          * In either case, propagate 'cmd' to all minors.
 616                                          */
 617                                         minor = 0;
 618                                         while (nfsd_minorversion(nn, minor, cmd) >= 0)
 619                                                 minor++;
 620                                 }
 621                                 break;
 622                         default:
 623                                 return -EINVAL;
 624                         }
 625                         vers += len + 1;
 626                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 627                 /* If all get turned off, turn them back on, as
 628                  * having no versions is BAD
 629                  */
 630                 nfsd_reset_versions(nn);
 631         }
 632
 633         /* Now write current state into reply buffer */
 634         len = 0;
 635         sep = "";
 636         remaining = SIMPLE_TRANSACTION_LIMIT;
 637         for (num=2 ; num <= 4 ; num++) {
 638                 int minor;
 639                 if (!nfsd_vers(nn, num, NFSD_AVAIL))
 640                         continue;
 641
 642                 minor = -1;
 643                 do {
 644                         len = nfsd_print_version_support(nn, buf, remaining,
 645                                         sep, num, minor);
 646                         if (len >= remaining)
 647                                 goto out;
 648                         remaining -= len;
 649                         buf += len;
 650                         tlen += len;
 651                         minor++;
 652                         if (len)
 653                                 sep = " ";
 654                 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
 655         }
 656 out:
 657         len = snprintf(buf, remaining, "\n");
 658         if (len >= remaining)
 659                 return -EINVAL;
 660         return tlen + len;
 661 }
 662
 663 /**
 664  * write_versions - Set or report the available NFS protocol versions
 665  *
 666  * Input:
 667  *                      buf:            ignored
 668  *                      size:           zero
 669  * Output:
 670  *      On success:     passed-in buffer filled with '\n'-terminated C
 671  *                      string containing positive or negative integer
 672  *                      values representing the current status of each
 673  *                      protocol version;
 674  *                      return code is the size in bytes of the string
 675  *      On error:       return code is zero or a negative errno value
 676  *
 677  * OR
 678  *
 679  * Input:
 680  *                      buf:            C string containing whitespace-
 681  *                                      separated positive or negative
 682  *                                      integer values representing NFS
 683  *                                      protocol versions to enable ("+n")
 684  *                                      or disable ("-n")
 685  *                      size:           non-zero length of C string in @buf
 686  * Output:
 687  *      On success:     status of zero or more protocol versions has
 688  *                      been updated; passed-in buffer filled with
 689  *                      '\n'-terminated C string containing positive
 690  *                      or negative integer values representing the
 691  *                      current status of each protocol version;
 692  *                      return code is the size in bytes of the string
 693  *      On error:       return code is zero or a negative errno value
 694  */
 695 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 696 {
 697         ssize_t rv;
 698
 699         mutex_lock(&nfsd_mutex);
 700         rv = __write_versions(file, buf, size);
 701         mutex_unlock(&nfsd_mutex);
 702         return rv;
 703 }
 704
 705 /*
 706  * Zero-length write.  Return a list of NFSD's current listener
 707  * transports.
 708  */
 709 static ssize_t __write_ports_names(char *buf, struct net *net)
 710 {
 711         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 712
 713         if (nn->nfsd_serv == NULL)
 714                 return 0;
 715         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 716 }
 717
 718 /*
 719  * A single 'fd' number was written, in which case it must be for
 720  * a socket of a supported family/protocol, and we use it as an
 721  * nfsd listener.
 722  */
 723 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
 724 {
 725         char *mesg = buf;
 726         int fd, err;
 727         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 728
 729         err = get_int(&mesg, &fd);
 730         if (err != 0 || fd < 0)
 731                 return -EINVAL;
 732
 733         if (svc_alien_sock(net, fd)) {
 734                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
 735                 return -EINVAL;
 736         }
 737
 738         err = nfsd_create_serv(net);
 739         if (err != 0)
 740                 return err;
 741
 742         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
 743         if (err < 0) {
 744                 nfsd_destroy(net);
 745                 return err;
 746         }
 747
 748         /* Decrease the count, but don't shut down the service */
 749         nn->nfsd_serv->sv_nrthreads--;
 750         return err;
 751 }
 752
 753 /*
 754  * A transport listener is added by writing it's transport name and
 755  * a port number.
 756  */
 757 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
 758 {
 759         char transport[16];
 760         struct svc_xprt *xprt;
 761         int port, err;
 762         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 763
 764         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
 765                 return -EINVAL;
 766
 767         if (port < 1 || port > USHRT_MAX)
 768                 return -EINVAL;
 769
 770         err = nfsd_create_serv(net);
 771         if (err != 0)
 772                 return err;
 773
 774         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 775                                 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
 776         if (err < 0)
 777                 goto out_err;
 778
 779         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 780                                 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
 781         if (err < 0 && err != -EAFNOSUPPORT)
 782                 goto out_close;
 783
 784         /* Decrease the count, but don't shut down the service */
 785         nn->nfsd_serv->sv_nrthreads--;
 786         return 0;
 787 out_close:
 788         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
 789         if (xprt != NULL) {
 790                 svc_close_xprt(xprt);
 791                 svc_xprt_put(xprt);
 792         }
 793 out_err:
 794         nfsd_destroy(net);
 795         return err;
 796 }
 797
 798 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
 799                              struct net *net)
 800 {
 801         if (size == 0)
 802                 return __write_ports_names(buf, net);
 803
 804         if (isdigit(buf[0]))
 805                 return __write_ports_addfd(buf, net, file->f_cred);
 806
 807         if (isalpha(buf[0]))
 808                 return __write_ports_addxprt(buf, net, file->f_cred);
 809
 810         return -EINVAL;
 811 }
 812
 813 /**
 814  * write_ports - Pass a socket file descriptor or transport name to listen on
 815  *
 816  * Input:
 817  *                      buf:            ignored
 818  *                      size:           zero
 819  * Output:
 820  *      On success:     passed-in buffer filled with a '\n'-terminated C
 821  *                      string containing a whitespace-separated list of
 822  *                      named NFSD listeners;
 823  *                      return code is the size in bytes of the string
 824  *      On error:       return code is zero or a negative errno value
 825  *
 826  * OR
 827  *
 828  * Input:
 829  *                      buf:            C string containing an unsigned
 830  *                                      integer value representing a bound
 831  *                                      but unconnected socket that is to be
 832  *                                      used as an NFSD listener; listen(3)
 833  *                                      must be called for a SOCK_STREAM
 834  *                                      socket, otherwise it is ignored
 835  *                      size:           non-zero length of C string in @buf
 836  * Output:
 837  *      On success:     NFS service is started;
 838  *                      passed-in buffer filled with a '\n'-terminated C
 839  *                      string containing a unique alphanumeric name of
 840  *                      the listener;
 841  *                      return code is the size in bytes of the string
 842  *      On error:       return code is a negative errno value
 843  *
 844  * OR
 845  *
 846  * Input:
 847  *                      buf:            C string containing a transport
 848  *                                      name and an unsigned integer value
 849  *                                      representing the port to listen on,
 850  *                                      separated by whitespace
 851  *                      size:           non-zero length of C string in @buf
 852  * Output:
 853  *      On success:     returns zero; NFS service is started
 854  *      On error:       return code is a negative errno value
 855  */
 856 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 857 {
 858         ssize_t rv;
 859
 860         mutex_lock(&nfsd_mutex);
 861         rv = __write_ports(file, buf, size, netns(file));
 862         mutex_unlock(&nfsd_mutex);
 863         return rv;
 864 }
 865
 866
 867 int nfsd_max_blksize;
 868
 869 /**
 870  * write_maxblksize - Set or report the current NFS blksize
 871  *
 872  * Input:
 873  *                      buf:            ignored
 874  *                      size:           zero
 875  *
 876  * OR
 877  *
 878  * Input:
 879  *                      buf:            C string containing an unsigned
 880  *                                      integer value representing the new
 881  *                                      NFS blksize
 882  *                      size:           non-zero length of C string in @buf
 883  * Output:
 884  *      On success:     passed-in buffer filled with '\n'-terminated C string
 885  *                      containing numeric value of the current NFS blksize
 886  *                      setting;
 887  *                      return code is the size in bytes of the string
 888  *      On error:       return code is zero or a negative errno value
 889  */
 890 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 891 {
 892         char *mesg = buf;
 893         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 894
 895         if (size > 0) {
 896                 int bsize;
 897                 int rv = get_int(&mesg, &bsize);
 898                 if (rv)
 899                         return rv;
 900                 /* force bsize into allowed range and
 901                  * required alignment.
 902                  */
 903                 bsize = max_t(int, bsize, 1024);
 904                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
 905                 bsize &= ~(1024-1);
 906                 mutex_lock(&nfsd_mutex);
 907                 if (nn->nfsd_serv) {
 908                         mutex_unlock(&nfsd_mutex);
 909                         return -EBUSY;
 910                 }
 911                 nfsd_max_blksize = bsize;
 912                 mutex_unlock(&nfsd_mutex);
 913         }
 914
 915         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 916                                                         nfsd_max_blksize);
 917 }
 918
 919 /**
 920  * write_maxconn - Set or report the current max number of connections
 921  *
 922  * Input:
 923  *                      buf:            ignored
 924  *                      size:           zero
 925  * OR
 926  *
 927  * Input:
 928  *                      buf:            C string containing an unsigned
 929  *                                      integer value representing the new
 930  *                                      number of max connections
 931  *                      size:           non-zero length of C string in @buf
 932  * Output:
 933  *      On success:     passed-in buffer filled with '\n'-terminated C string
 934  *                      containing numeric value of max_connections setting
 935  *                      for this net namespace;
 936  *                      return code is the size in bytes of the string
 937  *      On error:       return code is zero or a negative errno value
 938  */
 939 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
 940 {
 941         char *mesg = buf;
 942         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 943         unsigned int maxconn = nn->max_connections;
 944
 945         if (size > 0) {
 946                 int rv = get_uint(&mesg, &maxconn);
 947
 948                 if (rv)
 949                         return rv;
 950                 nn->max_connections = maxconn;
 951         }
 952
 953         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
 954 }
 955
 956 #ifdef CONFIG_NFSD_V4
 957 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
 958                                   time_t *time, struct nfsd_net *nn)
 959 {
 960         char *mesg = buf;
 961         int rv, i;
 962
 963         if (size > 0) {
 964                 if (nn->nfsd_serv)
 965                         return -EBUSY;
 966                 rv = get_int(&mesg, &i);
 967                 if (rv)
 968                         return rv;
 969                 /*
 970                  * Some sanity checking.  We don't have a reason for
 971                  * these particular numbers, but problems with the
 972                  * extremes are:
 973                  *      - Too short: the briefest network outage may
 974                  *        cause clients to lose all their locks.  Also,
 975                  *        the frequent polling may be wasteful.
 976                  *      - Too long: do you really want reboot recovery
 977                  *        to take more than an hour?  Or to make other
 978                  *        clients wait an hour before being able to
 979                  *        revoke a dead client's locks?
 980                  */
 981                 if (i < 10 || i > 3600)
 982                         return -EINVAL;
 983                 *time = i;
 984         }
 985
 986         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 987 }
 988
 989 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
 990                                 time_t *time, struct nfsd_net *nn)
 991 {
 992         ssize_t rv;
 993
 994         mutex_lock(&nfsd_mutex);
 995         rv = __nfsd4_write_time(file, buf, size, time, nn);
 996         mutex_unlock(&nfsd_mutex);
 997         return rv;
 998 }
 999
1000 /**
1001  * write_leasetime - Set or report the current NFSv4 lease time
1002  *
1003  * Input:
1004  *                      buf:            ignored
1005  *                      size:           zero
1006  *
1007  * OR
1008  *
1009  * Input:
1010  *                      buf:            C string containing an unsigned
1011  *                                      integer value representing the new
1012  *                                      NFSv4 lease expiry time
1013  *                      size:           non-zero length of C string in @buf
1014  * Output:
1015  *      On success:     passed-in buffer filled with '\n'-terminated C
1016  *                      string containing unsigned integer value of the
1017  *                      current lease expiry time;
1018  *                      return code is the size in bytes of the string
1019  *      On error:       return code is zero or a negative errno value
1020  */
1021 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1022 {
1023         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1024         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1025 }
1026
1027 /**
1028  * write_gracetime - Set or report current NFSv4 grace period time
1029  *
1030  * As above, but sets the time of the NFSv4 grace period.
1031  *
1032  * Note this should never be set to less than the *previous*
1033  * lease-period time, but we don't try to enforce this.  (In the common
1034  * case (a new boot), we don't know what the previous lease time was
1035  * anyway.)
1036  */
1037 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1038 {
1039         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1040         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1041 }
1042
1043 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1044                                    struct nfsd_net *nn)
1045 {
1046         char *mesg = buf;
1047         char *recdir;
1048         int len, status;
1049
1050         if (size > 0) {
1051                 if (nn->nfsd_serv)
1052                         return -EBUSY;
1053                 if (size > PATH_MAX || buf[size-1] != '\n')
1054                         return -EINVAL;
1055                 buf[size-1] = 0;
1056
1057                 recdir = mesg;
1058                 len = qword_get(&mesg, recdir, size);
1059                 if (len <= 0)
1060                         return -EINVAL;
1061
1062                 status = nfs4_reset_recoverydir(recdir);
1063                 if (status)
1064                         return status;
1065         }
1066
1067         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1068                                                         nfs4_recoverydir());
1069 }
1070
1071 /**
1072  * write_recoverydir - Set or report the pathname of the recovery directory
1073  *
1074  * Input:
1075  *                      buf:            ignored
1076  *                      size:           zero
1077  *
1078  * OR
1079  *
1080  * Input:
1081  *                      buf:            C string containing the pathname
1082  *                                      of the directory on a local file
1083  *                                      system containing permanent NFSv4
1084  *                                      recovery data
1085  *                      size:           non-zero length of C string in @buf
1086  * Output:
1087  *      On success:     passed-in buffer filled with '\n'-terminated C string
1088  *                      containing the current recovery pathname setting;
1089  *                      return code is the size in bytes of the string
1090  *      On error:       return code is zero or a negative errno value
1091  */
1092 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1093 {
1094         ssize_t rv;
1095         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1096
1097         mutex_lock(&nfsd_mutex);
1098         rv = __write_recoverydir(file, buf, size, nn);
1099         mutex_unlock(&nfsd_mutex);
1100         return rv;
1101 }
1102
1103 /**
1104  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1105  *
1106  * Input:
1107  *                      buf:            ignored
1108  *                      size:           zero
1109  * OR
1110  *
1111  * Input:
1112  *                      buf:            any value
1113  *                      size:           non-zero length of C string in @buf
1114  * Output:
1115  *                      passed-in buffer filled with "Y" or "N" with a newline
1116  *                      and NULL-terminated C string. This indicates whether
1117  *                      the grace period has ended in the current net
1118  *                      namespace. Return code is the size in bytes of the
1119  *                      string. Writing a string that starts with 'Y', 'y', or
1120  *                      '1' to the file will end the grace period for nfsd's v4
1121  *                      lock manager.
1122  */
1123 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1124 {
1125         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1126
1127         if (size > 0) {
1128                 switch(buf[0]) {
1129                 case 'Y':
1130                 case 'y':
1131                 case '1':
1132                         if (!nn->nfsd_serv)
1133                                 return -EBUSY;
1134                         nfsd4_end_grace(nn);
1135                         break;
1136                 default:
1137                         return -EINVAL;
1138                 }
1139         }
1140
1141         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1142                          nn->grace_ended ? 'Y' : 'N');
1143 }
1144
1145 #endif
1146
1147 /*----------------------------------------------------------------------------*/
1148 /*
1149  *      populating the filesystem.
1150  */
1151
1152 /* Basically copying rpc_get_inode. */
1153 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1154 {
1155         struct inode *inode = new_inode(sb);
1156         if (!inode)
1157                 return NULL;
1158         /* Following advice from simple_fill_super documentation: */
1159         inode->i_ino = iunique(sb, NFSD_MaxReserved);
1160         inode->i_mode = mode;
1161         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1162         switch (mode & S_IFMT) {
1163         case S_IFDIR:
1164                 inode->i_fop = &simple_dir_operations;
1165                 inode->i_op = &simple_dir_inode_operations;
1166                 inc_nlink(inode);
1167         default:
1168                 break;
1169         }
1170         return inode;
1171 }
1172
1173 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1174 {
1175         struct inode *inode;
1176
1177         inode = nfsd_get_inode(dir->i_sb, mode);
1178         if (!inode)
1179                 return -ENOMEM;
1180         d_add(dentry, inode);
1181         inc_nlink(dir);
1182         fsnotify_mkdir(dir, dentry);
1183         return 0;
1184 }
1185
1186 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1187 {
1188         struct inode *dir = parent->d_inode;
1189         struct dentry *dentry;
1190         int ret = -ENOMEM;
1191
1192         inode_lock(dir);
1193         dentry = d_alloc_name(parent, name);
1194         if (!dentry)
1195                 goto out_err;
1196         ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600);
1197         if (ret)
1198                 goto out_err;
1199         if (ncl) {
1200                 d_inode(dentry)->i_private = ncl;
1201                 kref_get(&ncl->cl_ref);
1202         }
1203 out:
1204         inode_unlock(dir);
1205         return dentry;
1206 out_err:
1207         dentry = ERR_PTR(ret);
1208         goto out;
1209 }
1210
1211 static void clear_ncl(struct inode *inode)
1212 {
1213         struct nfsdfs_client *ncl = inode->i_private;
1214
1215         inode->i_private = NULL;
1216         synchronize_rcu();
1217         kref_put(&ncl->cl_ref, ncl->cl_release);
1218 }
1219
1220
1221 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1222 {
1223         struct nfsdfs_client *nc = inode->i_private;
1224
1225         if (nc)
1226                 kref_get(&nc->cl_ref);
1227         return nc;
1228 }
1229
1230 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1231 {
1232         struct nfsdfs_client *nc;
1233
1234         rcu_read_lock();
1235         nc = __get_nfsdfs_client(inode);
1236         rcu_read_unlock();
1237         return nc;
1238 }
1239 /* from __rpc_unlink */
1240 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1241 {
1242         int ret;
1243
1244         clear_ncl(d_inode(dentry));
1245         dget(dentry);
1246         ret = simple_unlink(dir, dentry);
1247         d_delete(dentry);
1248         dput(dentry);
1249         WARN_ON_ONCE(ret);
1250 }
1251
1252 static void nfsdfs_remove_files(struct dentry *root)
1253 {
1254         struct dentry *dentry, *tmp;
1255
1256         list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1257                 if (!simple_positive(dentry)) {
1258                         WARN_ON_ONCE(1); /* I think this can't happen? */
1259                         continue;
1260                 }
1261                 nfsdfs_remove_file(d_inode(root), dentry);
1262         }
1263 }
1264
1265 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1266  * code instead. */
1267 static  int nfsdfs_create_files(struct dentry *root,
1268                                         const struct tree_descr *files)
1269 {
1270         struct inode *dir = d_inode(root);
1271         struct inode *inode;
1272         struct dentry *dentry;
1273         int i;
1274
1275         inode_lock(dir);
1276         for (i = 0; files->name && files->name[0]; i++, files++) {
1277                 if (!files->name)
1278                         continue;
1279                 dentry = d_alloc_name(root, files->name);
1280                 if (!dentry)
1281                         goto out;
1282                 inode = nfsd_get_inode(d_inode(root)->i_sb,
1283                                         S_IFREG | files->mode);
1284                 if (!inode) {
1285                         dput(dentry);
1286                         goto out;
1287                 }
1288                 inode->i_fop = files->ops;
1289                 inode->i_private = __get_nfsdfs_client(dir);
1290                 d_add(dentry, inode);
1291                 fsnotify_create(dir, dentry);
1292         }
1293         inode_unlock(dir);
1294         return 0;
1295 out:
1296         nfsdfs_remove_files(root);
1297         inode_unlock(dir);
1298         return -ENOMEM;
1299 }
1300
1301 /* on success, returns positive number unique to that client. */
1302 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1303                 struct nfsdfs_client *ncl, u32 id,
1304                 const struct tree_descr *files)
1305 {
1306         struct dentry *dentry;
1307         char name[11];
1308         int ret;
1309
1310         sprintf(name, "%u", id);
1311
1312         dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1313         if (IS_ERR(dentry)) /* XXX: tossing errors? */
1314                 return NULL;
1315         ret = nfsdfs_create_files(dentry, files);
1316         if (ret) {
1317                 nfsd_client_rmdir(dentry);
1318                 return NULL;
1319         }
1320         return dentry;
1321 }
1322
1323 /* Taken from __rpc_rmdir: */
1324 void nfsd_client_rmdir(struct dentry *dentry)
1325 {
1326         struct inode *dir = d_inode(dentry->d_parent);
1327         struct inode *inode = d_inode(dentry);
1328         int ret;
1329
1330         inode_lock(dir);
1331         nfsdfs_remove_files(dentry);
1332         clear_ncl(inode);
1333         dget(dentry);
1334         ret = simple_rmdir(dir, dentry);
1335         WARN_ON_ONCE(ret);
1336         d_delete(dentry);
1337         inode_unlock(dir);
1338 }
1339
1340 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1341 {
1342         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1343                                                         nfsd_net_id);
1344         struct dentry *dentry;
1345         int ret;
1346
1347         static const struct tree_descr nfsd_files[] = {
1348                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1349                 [NFSD_Export_features] = {"export_features",
1350                                         &export_features_operations, S_IRUGO},
1351                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1352                                         &transaction_ops, S_IWUSR|S_IRUSR},
1353                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1354                                         &transaction_ops, S_IWUSR|S_IRUSR},
1355                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1356                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1357                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1358                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1359                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1360                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1361                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1362                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1363                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1364 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1365                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1366 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1367 #ifdef CONFIG_NFSD_V4
1368                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1369                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1370                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1371                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1372 #endif
1373                 /* last one */ {""}
1374         };
1375         get_net(sb->s_fs_info);
1376         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1377         if (ret)
1378                 return ret;
1379         dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1380         if (IS_ERR(dentry))
1381                 return PTR_ERR(dentry);
1382         nn->nfsd_client_dir = dentry;
1383         return 0;
1384
1385 }
1386
1387 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1388         int flags, const char *dev_name, void *data)
1389 {
1390         struct net *net = current->nsproxy->net_ns;
1391         return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1392 }
1393
1394 static void nfsd_umount(struct super_block *sb)
1395 {
1396         struct net *net = sb->s_fs_info;
1397
1398         kill_litter_super(sb);
1399         put_net(net);
1400 }
1401
1402 static struct file_system_type nfsd_fs_type = {
1403         .owner          = THIS_MODULE,
1404         .name           = "nfsd",
1405         .mount          = nfsd_mount,
1406         .kill_sb        = nfsd_umount,
1407 };
1408 MODULE_ALIAS_FS("nfsd");
1409
1410 #ifdef CONFIG_PROC_FS
1411 static int create_proc_exports_entry(void)
1412 {
1413         struct proc_dir_entry *entry;
1414
1415         entry = proc_mkdir("fs/nfs", NULL);
1416         if (!entry)
1417                 return -ENOMEM;
1418         entry = proc_create("exports", 0, entry,
1419                                  &exports_proc_operations);
1420         if (!entry) {
1421                 remove_proc_entry("fs/nfs", NULL);
1422                 return -ENOMEM;
1423         }
1424         return 0;
1425 }
1426 #else /* CONFIG_PROC_FS */
1427 static int create_proc_exports_entry(void)
1428 {
1429         return 0;
1430 }
1431 #endif
1432
1433 unsigned int nfsd_net_id;
1434
1435 static __net_init int nfsd_init_net(struct net *net)
1436 {
1437         int retval;
1438         struct vfsmount *mnt;
1439         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1440
1441         retval = nfsd_export_init(net);
1442         if (retval)
1443                 goto out_export_error;
1444         retval = nfsd_idmap_init(net);
1445         if (retval)
1446                 goto out_idmap_error;
1447         nn->nfsd_versions = NULL;
1448         nn->nfsd4_minorversions = NULL;
1449         retval = nfsd_reply_cache_init(nn);
1450         if (retval)
1451                 goto out_drc_error;
1452         nn->nfsd4_lease = 90;   /* default lease time */
1453         nn->nfsd4_grace = 90;
1454         nn->somebody_reclaimed = false;
1455         nn->track_reclaim_completes = false;
1456         nn->clverifier_counter = prandom_u32();
1457         nn->clientid_base = prandom_u32();
1458         nn->clientid_counter = nn->clientid_base + 1;
1459         nn->s2s_cp_cl_id = nn->clientid_counter++;
1460
1461         atomic_set(&nn->ntf_refcnt, 0);
1462         init_waitqueue_head(&nn->ntf_wq);
1463
1464         mnt =  vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
1465         if (IS_ERR(mnt)) {
1466                 retval = PTR_ERR(mnt);
1467                 goto out_mount_err;
1468         }
1469         nn->nfsd_mnt = mnt;
1470         return 0;
1471
1472 out_mount_err:
1473         nfsd_reply_cache_shutdown(nn);
1474 out_drc_error:
1475         nfsd_idmap_shutdown(net);
1476 out_idmap_error:
1477         nfsd_export_shutdown(net);
1478 out_export_error:
1479         return retval;
1480 }
1481
1482 static __net_exit void nfsd_exit_net(struct net *net)
1483 {
1484         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1485
1486         mntput(nn->nfsd_mnt);
1487         nfsd_reply_cache_shutdown(nn);
1488         nfsd_idmap_shutdown(net);
1489         nfsd_export_shutdown(net);
1490         nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1491 }
1492
1493 static struct pernet_operations nfsd_net_ops = {
1494         .init = nfsd_init_net,
1495         .exit = nfsd_exit_net,
1496         .id   = &nfsd_net_id,
1497         .size = sizeof(struct nfsd_net),
1498 };
1499
1500 static int __init init_nfsd(void)
1501 {
1502         int retval;
1503         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1504
1505         retval = register_pernet_subsys(&nfsd_net_ops);
1506         if (retval < 0)
1507                 return retval;
1508         retval = register_cld_notifier();
1509         if (retval)
1510                 goto out_unregister_pernet;
1511         retval = nfsd4_init_slabs();
1512         if (retval)
1513                 goto out_unregister_notifier;
1514         retval = nfsd4_init_pnfs();
1515         if (retval)
1516                 goto out_free_slabs;
1517         nfsd_fault_inject_init(); /* nfsd fault injection controls */
1518         nfsd_stat_init();       /* Statistics */
1519         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1520         retval = create_proc_exports_entry();
1521         if (retval)
1522                 goto out_free_lockd;
1523         retval = register_filesystem(&nfsd_fs_type);
1524         if (retval)
1525                 goto out_free_all;
1526         return 0;
1527 out_free_all:
1528         remove_proc_entry("fs/nfs/exports", NULL);
1529         remove_proc_entry("fs/nfs", NULL);
1530 out_free_lockd:
1531         nfsd_lockd_shutdown();
1532         nfsd_stat_shutdown();
1533         nfsd_fault_inject_cleanup();
1534         nfsd4_exit_pnfs();
1535 out_free_slabs:
1536         nfsd4_free_slabs();
1537 out_unregister_notifier:
1538         unregister_cld_notifier();
1539 out_unregister_pernet:
1540         unregister_pernet_subsys(&nfsd_net_ops);
1541         return retval;
1542 }
1543
1544 static void __exit exit_nfsd(void)
1545 {
1546         remove_proc_entry("fs/nfs/exports", NULL);
1547         remove_proc_entry("fs/nfs", NULL);
1548         nfsd_stat_shutdown();
1549         nfsd_lockd_shutdown();
1550         nfsd4_free_slabs();
1551         nfsd4_exit_pnfs();
1552         nfsd_fault_inject_cleanup();
1553         unregister_filesystem(&nfsd_fs_type);
1554         unregister_cld_notifier();
1555         unregister_pernet_subsys(&nfsd_net_ops);
1556 }
1557
1558 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1559 MODULE_LICENSE("GPL");
1560 module_init(init_nfsd)
1561 module_exit(exit_nfsd)