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 #include <linux/fs_context.h>
  12
  13 #include <linux/sunrpc/svcsock.h>
  14 #include <linux/lockd/lockd.h>
  15 #include <linux/sunrpc/addr.h>
  16 #include <linux/sunrpc/gss_api.h>
  17 #include <linux/sunrpc/gss_krb5_enctypes.h>
  18 #include <linux/sunrpc/rpc_pipe_fs.h>
  19 #include <linux/module.h>
  20 #include <linux/fsnotify.h>
  21
  22 #include "idmap.h"
  23 #include "nfsd.h"
  24 #include "cache.h"
  25 #include "state.h"
  26 #include "netns.h"
  27 #include "pnfs.h"
  28
  29 /*
  30  *      We have a single directory with several nodes in it.
  31  */
  32 enum {
  33         NFSD_Root = 1,
  34         NFSD_List,
  35         NFSD_Export_features,
  36         NFSD_Fh,
  37         NFSD_FO_UnlockIP,
  38         NFSD_FO_UnlockFS,
  39         NFSD_Threads,
  40         NFSD_Pool_Threads,
  41         NFSD_Pool_Stats,
  42         NFSD_Reply_Cache_Stats,
  43         NFSD_Versions,
  44         NFSD_Ports,
  45         NFSD_MaxBlkSize,
  46         NFSD_MaxConnections,
  47         NFSD_SupportedEnctypes,
  48         /*
  49          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  50          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  51          */
  52 #ifdef CONFIG_NFSD_V4
  53         NFSD_Leasetime,
  54         NFSD_Gracetime,
  55         NFSD_RecoveryDir,
  56         NFSD_V4EndGrace,
  57 #endif
  58         NFSD_MaxReserved
  59 };
  60
  61 /*
  62  * write() for these nodes.
  63  */
  64 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  65 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  66 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  67 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  68 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  69 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  70 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  71 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  72 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
  73 #ifdef CONFIG_NFSD_V4
  74 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  75 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  76 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  77 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
  78 #endif
  79
  80 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
  81         [NFSD_Fh] = write_filehandle,
  82         [NFSD_FO_UnlockIP] = write_unlock_ip,
  83         [NFSD_FO_UnlockFS] = write_unlock_fs,
  84         [NFSD_Threads] = write_threads,
  85         [NFSD_Pool_Threads] = write_pool_threads,
  86         [NFSD_Versions] = write_versions,
  87         [NFSD_Ports] = write_ports,
  88         [NFSD_MaxBlkSize] = write_maxblksize,
  89         [NFSD_MaxConnections] = write_maxconn,
  90 #ifdef CONFIG_NFSD_V4
  91         [NFSD_Leasetime] = write_leasetime,
  92         [NFSD_Gracetime] = write_gracetime,
  93         [NFSD_RecoveryDir] = write_recoverydir,
  94         [NFSD_V4EndGrace] = write_v4_end_grace,
  95 #endif
  96 };
  97
  98 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  99 {
 100         ino_t ino =  file_inode(file)->i_ino;
 101         char *data;
 102         ssize_t rv;
 103
 104         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 105                 return -EINVAL;
 106
 107         data = simple_transaction_get(file, buf, size);
 108         if (IS_ERR(data))
 109                 return PTR_ERR(data);
 110
 111         rv =  write_op[ino](file, data, size);
 112         if (rv >= 0) {
 113                 simple_transaction_set(file, rv);
 114                 rv = size;
 115         }
 116         return rv;
 117 }
 118
 119 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 120 {
 121         if (! file->private_data) {
 122                 /* An attempt to read a transaction file without writing
 123                  * causes a 0-byte write so that the file can return
 124                  * state information
 125                  */
 126                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 127                 if (rv < 0)
 128                         return rv;
 129         }
 130         return simple_transaction_read(file, buf, size, pos);
 131 }
 132
 133 static const struct file_operations transaction_ops = {
 134         .write          = nfsctl_transaction_write,
 135         .read           = nfsctl_transaction_read,
 136         .release        = simple_transaction_release,
 137         .llseek         = default_llseek,
 138 };
 139
 140 static int exports_net_open(struct net *net, struct file *file)
 141 {
 142         int err;
 143         struct seq_file *seq;
 144         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 145
 146         err = seq_open(file, &nfs_exports_op);
 147         if (err)
 148                 return err;
 149
 150         seq = file->private_data;
 151         seq->private = nn->svc_export_cache;
 152         return 0;
 153 }
 154
 155 static int exports_proc_open(struct inode *inode, struct file *file)
 156 {
 157         return exports_net_open(current->nsproxy->net_ns, file);
 158 }
 159
 160 static const struct file_operations exports_proc_operations = {
 161         .open           = exports_proc_open,
 162         .read           = seq_read,
 163         .llseek         = seq_lseek,
 164         .release        = seq_release,
 165 };
 166
 167 static int exports_nfsd_open(struct inode *inode, struct file *file)
 168 {
 169         return exports_net_open(inode->i_sb->s_fs_info, file);
 170 }
 171
 172 static const struct file_operations exports_nfsd_operations = {
 173         .open           = exports_nfsd_open,
 174         .read           = seq_read,
 175         .llseek         = seq_lseek,
 176         .release        = seq_release,
 177 };
 178
 179 static int export_features_show(struct seq_file *m, void *v)
 180 {
 181         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 182         return 0;
 183 }
 184
 185 static int export_features_open(struct inode *inode, struct file *file)
 186 {
 187         return single_open(file, export_features_show, NULL);
 188 }
 189
 190 static const struct file_operations export_features_operations = {
 191         .open           = export_features_open,
 192         .read           = seq_read,
 193         .llseek         = seq_lseek,
 194         .release        = single_release,
 195 };
 196
 197 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 198 static int supported_enctypes_show(struct seq_file *m, void *v)
 199 {
 200         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 201         return 0;
 202 }
 203
 204 static int supported_enctypes_open(struct inode *inode, struct file *file)
 205 {
 206         return single_open(file, supported_enctypes_show, NULL);
 207 }
 208
 209 static const struct file_operations supported_enctypes_ops = {
 210         .open           = supported_enctypes_open,
 211         .read           = seq_read,
 212         .llseek         = seq_lseek,
 213         .release        = single_release,
 214 };
 215 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 216
 217 static const struct file_operations pool_stats_operations = {
 218         .open           = nfsd_pool_stats_open,
 219         .read           = seq_read,
 220         .llseek         = seq_lseek,
 221         .release        = nfsd_pool_stats_release,
 222 };
 223
 224 static const struct file_operations reply_cache_stats_operations = {
 225         .open           = nfsd_reply_cache_stats_open,
 226         .read           = seq_read,
 227         .llseek         = seq_lseek,
 228         .release        = single_release,
 229 };
 230
 231 /*----------------------------------------------------------------------------*/
 232 /*
 233  * payload - write methods
 234  */
 235
 236 static inline struct net *netns(struct file *file)
 237 {
 238         return file_inode(file)->i_sb->s_fs_info;
 239 }
 240
 241 /**
 242  * write_unlock_ip - Release all locks used by a client
 243  *
 244  * Experimental.
 245  *
 246  * Input:
 247  *                      buf:    '\n'-terminated C string containing a
 248  *                              presentation format IP address
 249  *                      size:   length of C string in @buf
 250  * Output:
 251  *      On success:     returns zero if all specified locks were released;
 252  *                      returns one if one or more locks were not released
 253  *      On error:       return code is negative errno value
 254  */
 255 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 256 {
 257         struct sockaddr_storage address;
 258         struct sockaddr *sap = (struct sockaddr *)&address;
 259         size_t salen = sizeof(address);
 260         char *fo_path;
 261         struct net *net = netns(file);
 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         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
 275                 return -EINVAL;
 276
 277         return nlmsvc_unlock_all_by_ip(sap);
 278 }
 279
 280 /**
 281  * write_unlock_fs - Release all locks on a local file system
 282  *
 283  * Experimental.
 284  *
 285  * Input:
 286  *                      buf:    '\n'-terminated C string containing the
 287  *                              absolute pathname of a local file system
 288  *                      size:   length of C string in @buf
 289  * Output:
 290  *      On success:     returns zero if all specified locks were released;
 291  *                      returns one if one or more locks were not released
 292  *      On error:       return code is negative errno value
 293  */
 294 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 295 {
 296         struct path path;
 297         char *fo_path;
 298         int error;
 299
 300         /* sanity check */
 301         if (size == 0)
 302                 return -EINVAL;
 303
 304         if (buf[size-1] != '\n')
 305                 return -EINVAL;
 306
 307         fo_path = buf;
 308         if (qword_get(&buf, fo_path, size) < 0)
 309                 return -EINVAL;
 310
 311         error = kern_path(fo_path, 0, &path);
 312         if (error)
 313                 return error;
 314
 315         /*
 316          * XXX: Needs better sanity checking.  Otherwise we could end up
 317          * releasing locks on the wrong file system.
 318          *
 319          * For example:
 320          * 1.  Does the path refer to a directory?
 321          * 2.  Is that directory a mount point, or
 322          * 3.  Is that directory the root of an exported file system?
 323          */
 324         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 325
 326         path_put(&path);
 327         return error;
 328 }
 329
 330 /**
 331  * write_filehandle - Get a variable-length NFS file handle by path
 332  *
 333  * On input, the buffer contains a '\n'-terminated C string comprised of
 334  * three alphanumeric words separated by whitespace.  The string may
 335  * contain escape sequences.
 336  *
 337  * Input:
 338  *                      buf:
 339  *                              domain:         client domain name
 340  *                              path:           export pathname
 341  *                              maxsize:        numeric maximum size of
 342  *                                              @buf
 343  *                      size:   length of C string in @buf
 344  * Output:
 345  *      On success:     passed-in buffer filled with '\n'-terminated C
 346  *                      string containing a ASCII hex text version
 347  *                      of the NFS file handle;
 348  *                      return code is the size in bytes of the string
 349  *      On error:       return code is negative errno value
 350  */
 351 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 352 {
 353         char *dname, *path;
 354         int maxsize;
 355         char *mesg = buf;
 356         int len;
 357         struct auth_domain *dom;
 358         struct knfsd_fh fh;
 359
 360         if (size == 0)
 361                 return -EINVAL;
 362
 363         if (buf[size-1] != '\n')
 364                 return -EINVAL;
 365         buf[size-1] = 0;
 366
 367         dname = mesg;
 368         len = qword_get(&mesg, dname, size);
 369         if (len <= 0)
 370                 return -EINVAL;
 371
 372         path = dname+len+1;
 373         len = qword_get(&mesg, path, size);
 374         if (len <= 0)
 375                 return -EINVAL;
 376
 377         len = get_int(&mesg, &maxsize);
 378         if (len)
 379                 return len;
 380
 381         if (maxsize < NFS_FHSIZE)
 382                 return -EINVAL;
 383         maxsize = min(maxsize, NFS3_FHSIZE);
 384
 385         if (qword_get(&mesg, mesg, size)>0)
 386                 return -EINVAL;
 387
 388         /* we have all the words, they are in buf.. */
 389         dom = unix_domain_find(dname);
 390         if (!dom)
 391                 return -ENOMEM;
 392
 393         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
 394         auth_domain_put(dom);
 395         if (len)
 396                 return len;
 397
 398         mesg = buf;
 399         len = SIMPLE_TRANSACTION_LIMIT;
 400         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 401         mesg[-1] = '\n';
 402         return mesg - buf;
 403 }
 404
 405 /**
 406  * write_threads - Start NFSD, or report the current number of running threads
 407  *
 408  * Input:
 409  *                      buf:            ignored
 410  *                      size:           zero
 411  * Output:
 412  *      On success:     passed-in buffer filled with '\n'-terminated C
 413  *                      string numeric value representing the number of
 414  *                      running NFSD threads;
 415  *                      return code is the size in bytes of the string
 416  *      On error:       return code is zero
 417  *
 418  * OR
 419  *
 420  * Input:
 421  *                      buf:            C string containing an unsigned
 422  *                                      integer value representing the
 423  *                                      number of NFSD threads to start
 424  *                      size:           non-zero length of C string in @buf
 425  * Output:
 426  *      On success:     NFS service is started;
 427  *                      passed-in buffer filled with '\n'-terminated C
 428  *                      string numeric value representing the number of
 429  *                      running NFSD threads;
 430  *                      return code is the size in bytes of the string
 431  *      On error:       return code is zero or a negative errno value
 432  */
 433 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 434 {
 435         char *mesg = buf;
 436         int rv;
 437         struct net *net = netns(file);
 438
 439         if (size > 0) {
 440                 int newthreads;
 441                 rv = get_int(&mesg, &newthreads);
 442                 if (rv)
 443                         return rv;
 444                 if (newthreads < 0)
 445                         return -EINVAL;
 446                 rv = nfsd_svc(newthreads, net, file->f_cred);
 447                 if (rv < 0)
 448                         return rv;
 449         } else
 450                 rv = nfsd_nrthreads(net);
 451
 452         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 453 }
 454
 455 /**
 456  * write_pool_threads - Set or report the current number of threads per pool
 457  *
 458  * Input:
 459  *                      buf:            ignored
 460  *                      size:           zero
 461  *
 462  * OR
 463  *
 464  * Input:
 465  *                      buf:            C string containing whitespace-
 466  *                                      separated unsigned integer values
 467  *                                      representing the number of NFSD
 468  *                                      threads to start in each pool
 469  *                      size:           non-zero length of C string in @buf
 470  * Output:
 471  *      On success:     passed-in buffer filled with '\n'-terminated C
 472  *                      string containing integer values representing the
 473  *                      number of NFSD threads in each pool;
 474  *                      return code is the size in bytes of the string
 475  *      On error:       return code is zero or a negative errno value
 476  */
 477 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 478 {
 479         /* if size > 0, look for an array of number of threads per node
 480          * and apply them  then write out number of threads per node as reply
 481          */
 482         char *mesg = buf;
 483         int i;
 484         int rv;
 485         int len;
 486         int npools;
 487         int *nthreads;
 488         struct net *net = netns(file);
 489
 490         mutex_lock(&nfsd_mutex);
 491         npools = nfsd_nrpools(net);
 492         if (npools == 0) {
 493                 /*
 494                  * NFS is shut down.  The admin can start it by
 495                  * writing to the threads file but NOT the pool_threads
 496                  * file, sorry.  Report zero threads.
 497                  */
 498                 mutex_unlock(&nfsd_mutex);
 499                 strcpy(buf, "0\n");
 500                 return strlen(buf);
 501         }
 502
 503         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 504         rv = -ENOMEM;
 505         if (nthreads == NULL)
 506                 goto out_free;
 507
 508         if (size > 0) {
 509                 for (i = 0; i < npools; i++) {
 510                         rv = get_int(&mesg, &nthreads[i]);
 511                         if (rv == -ENOENT)
 512                                 break;          /* fewer numbers than pools */
 513                         if (rv)
 514                                 goto out_free;  /* syntax error */
 515                         rv = -EINVAL;
 516                         if (nthreads[i] < 0)
 517                                 goto out_free;
 518                 }
 519                 rv = nfsd_set_nrthreads(i, nthreads, net);
 520                 if (rv)
 521                         goto out_free;
 522         }
 523
 524         rv = nfsd_get_nrthreads(npools, nthreads, net);
 525         if (rv)
 526                 goto out_free;
 527
 528         mesg = buf;
 529         size = SIMPLE_TRANSACTION_LIMIT;
 530         for (i = 0; i < npools && size > 0; i++) {
 531                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 532                 len = strlen(mesg);
 533                 size -= len;
 534                 mesg += len;
 535         }
 536         rv = mesg - buf;
 537 out_free:
 538         kfree(nthreads);
 539         mutex_unlock(&nfsd_mutex);
 540         return rv;
 541 }
 542
 543 static ssize_t
 544 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
 545                 const char *sep, unsigned vers, int minor)
 546 {
 547         const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
 548         bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
 549
 550         if (vers == 4 && minor >= 0 &&
 551             !nfsd_minorversion(nn, minor, NFSD_TEST))
 552                 supported = false;
 553         if (minor == 0 && supported)
 554                 /*
 555                  * special case for backward compatability.
 556                  * +4.0 is never reported, it is implied by
 557                  * +4, unless -4.0 is present.
 558                  */
 559                 return 0;
 560         return snprintf(buf, remaining, format, sep,
 561                         supported ? '+' : '-', vers, minor);
 562 }
 563
 564 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 565 {
 566         char *mesg = buf;
 567         char *vers, *minorp, sign;
 568         int len, num, remaining;
 569         ssize_t tlen = 0;
 570         char *sep;
 571         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 572
 573         if (size>0) {
 574                 if (nn->nfsd_serv)
 575                         /* Cannot change versions without updating
 576                          * nn->nfsd_serv->sv_xdrsize, and reallocing
 577                          * rq_argp and rq_resp
 578                          */
 579                         return -EBUSY;
 580                 if (buf[size-1] != '\n')
 581                         return -EINVAL;
 582                 buf[size-1] = 0;
 583
 584                 vers = mesg;
 585                 len = qword_get(&mesg, vers, size);
 586                 if (len <= 0) return -EINVAL;
 587                 do {
 588                         enum vers_op cmd;
 589                         unsigned minor;
 590                         sign = *vers;
 591                         if (sign == '+' || sign == '-')
 592                                 num = simple_strtol((vers+1), &minorp, 0);
 593                         else
 594                                 num = simple_strtol(vers, &minorp, 0);
 595                         if (*minorp == '.') {
 596                                 if (num != 4)
 597                                         return -EINVAL;
 598                                 if (kstrtouint(minorp+1, 0, &minor) < 0)
 599                                         return -EINVAL;
 600                         }
 601
 602                         cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
 603                         switch(num) {
 604                         case 2:
 605                         case 3:
 606                                 nfsd_vers(nn, num, cmd);
 607                                 break;
 608                         case 4:
 609                                 if (*minorp == '.') {
 610                                         if (nfsd_minorversion(nn, minor, cmd) < 0)
 611                                                 return -EINVAL;
 612                                 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
 613                                         /*
 614                                          * Either we have +4 and no minors are enabled,
 615                                          * or we have -4 and at least one minor is enabled.
 616                                          * In either case, propagate 'cmd' to all minors.
 617                                          */
 618                                         minor = 0;
 619                                         while (nfsd_minorversion(nn, minor, cmd) >= 0)
 620                                                 minor++;
 621                                 }
 622                                 break;
 623                         default:
 624                                 return -EINVAL;
 625                         }
 626                         vers += len + 1;
 627                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 628                 /* If all get turned off, turn them back on, as
 629                  * having no versions is BAD
 630                  */
 631                 nfsd_reset_versions(nn);
 632         }
 633
 634         /* Now write current state into reply buffer */
 635         len = 0;
 636         sep = "";
 637         remaining = SIMPLE_TRANSACTION_LIMIT;
 638         for (num=2 ; num <= 4 ; num++) {
 639                 int minor;
 640                 if (!nfsd_vers(nn, num, NFSD_AVAIL))
 641                         continue;
 642
 643                 minor = -1;
 644                 do {
 645                         len = nfsd_print_version_support(nn, buf, remaining,
 646                                         sep, num, minor);
 647                         if (len >= remaining)
 648                                 goto out;
 649                         remaining -= len;
 650                         buf += len;
 651                         tlen += len;
 652                         minor++;
 653                         if (len)
 654                                 sep = " ";
 655                 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
 656         }
 657 out:
 658         len = snprintf(buf, remaining, "\n");
 659         if (len >= remaining)
 660                 return -EINVAL;
 661         return tlen + len;
 662 }
 663
 664 /**
 665  * write_versions - Set or report the available NFS protocol versions
 666  *
 667  * Input:
 668  *                      buf:            ignored
 669  *                      size:           zero
 670  * Output:
 671  *      On success:     passed-in buffer filled with '\n'-terminated C
 672  *                      string containing positive or negative integer
 673  *                      values representing the current status of each
 674  *                      protocol version;
 675  *                      return code is the size in bytes of the string
 676  *      On error:       return code is zero or a negative errno value
 677  *
 678  * OR
 679  *
 680  * Input:
 681  *                      buf:            C string containing whitespace-
 682  *                                      separated positive or negative
 683  *                                      integer values representing NFS
 684  *                                      protocol versions to enable ("+n")
 685  *                                      or disable ("-n")
 686  *                      size:           non-zero length of C string in @buf
 687  * Output:
 688  *      On success:     status of zero or more protocol versions has
 689  *                      been updated; passed-in buffer filled with
 690  *                      '\n'-terminated C string containing positive
 691  *                      or negative integer values representing the
 692  *                      current status of each protocol version;
 693  *                      return code is the size in bytes of the string
 694  *      On error:       return code is zero or a negative errno value
 695  */
 696 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 697 {
 698         ssize_t rv;
 699
 700         mutex_lock(&nfsd_mutex);
 701         rv = __write_versions(file, buf, size);
 702         mutex_unlock(&nfsd_mutex);
 703         return rv;
 704 }
 705
 706 /*
 707  * Zero-length write.  Return a list of NFSD's current listener
 708  * transports.
 709  */
 710 static ssize_t __write_ports_names(char *buf, struct net *net)
 711 {
 712         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 713
 714         if (nn->nfsd_serv == NULL)
 715                 return 0;
 716         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 717 }
 718
 719 /*
 720  * A single 'fd' number was written, in which case it must be for
 721  * a socket of a supported family/protocol, and we use it as an
 722  * nfsd listener.
 723  */
 724 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
 725 {
 726         char *mesg = buf;
 727         int fd, err;
 728         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 729
 730         err = get_int(&mesg, &fd);
 731         if (err != 0 || fd < 0)
 732                 return -EINVAL;
 733
 734         if (svc_alien_sock(net, fd)) {
 735                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
 736                 return -EINVAL;
 737         }
 738
 739         err = nfsd_create_serv(net);
 740         if (err != 0)
 741                 return err;
 742
 743         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
 744         if (err < 0) {
 745                 nfsd_destroy(net);
 746                 return err;
 747         }
 748
 749         /* Decrease the count, but don't shut down the service */
 750         nn->nfsd_serv->sv_nrthreads--;
 751         return err;
 752 }
 753
 754 /*
 755  * A transport listener is added by writing it's transport name and
 756  * a port number.
 757  */
 758 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
 759 {
 760         char transport[16];
 761         struct svc_xprt *xprt;
 762         int port, err;
 763         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 764
 765         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
 766                 return -EINVAL;
 767
 768         if (port < 1 || port > USHRT_MAX)
 769                 return -EINVAL;
 770
 771         err = nfsd_create_serv(net);
 772         if (err != 0)
 773                 return err;
 774
 775         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 776                                 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
 777         if (err < 0)
 778                 goto out_err;
 779
 780         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 781                                 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
 782         if (err < 0 && err != -EAFNOSUPPORT)
 783                 goto out_close;
 784
 785         /* Decrease the count, but don't shut down the service */
 786         nn->nfsd_serv->sv_nrthreads--;
 787         return 0;
 788 out_close:
 789         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
 790         if (xprt != NULL) {
 791                 svc_close_xprt(xprt);
 792                 svc_xprt_put(xprt);
 793         }
 794 out_err:
 795         if (!list_empty(&nn->nfsd_serv->sv_permsocks))
 796                 nn->nfsd_serv->sv_nrthreads--;
 797          else
 798                 nfsd_destroy(net);
 799         return err;
 800 }
 801
 802 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
 803                              struct net *net)
 804 {
 805         if (size == 0)
 806                 return __write_ports_names(buf, net);
 807
 808         if (isdigit(buf[0]))
 809                 return __write_ports_addfd(buf, net, file->f_cred);
 810
 811         if (isalpha(buf[0]))
 812                 return __write_ports_addxprt(buf, net, file->f_cred);
 813
 814         return -EINVAL;
 815 }
 816
 817 /**
 818  * write_ports - Pass a socket file descriptor or transport name to listen on
 819  *
 820  * Input:
 821  *                      buf:            ignored
 822  *                      size:           zero
 823  * Output:
 824  *      On success:     passed-in buffer filled with a '\n'-terminated C
 825  *                      string containing a whitespace-separated list of
 826  *                      named NFSD listeners;
 827  *                      return code is the size in bytes of the string
 828  *      On error:       return code is zero or a negative errno value
 829  *
 830  * OR
 831  *
 832  * Input:
 833  *                      buf:            C string containing an unsigned
 834  *                                      integer value representing a bound
 835  *                                      but unconnected socket that is to be
 836  *                                      used as an NFSD listener; listen(3)
 837  *                                      must be called for a SOCK_STREAM
 838  *                                      socket, otherwise it is ignored
 839  *                      size:           non-zero length of C string in @buf
 840  * Output:
 841  *      On success:     NFS service is started;
 842  *                      passed-in buffer filled with a '\n'-terminated C
 843  *                      string containing a unique alphanumeric name of
 844  *                      the listener;
 845  *                      return code is the size in bytes of the string
 846  *      On error:       return code is a negative errno value
 847  *
 848  * OR
 849  *
 850  * Input:
 851  *                      buf:            C string containing a transport
 852  *                                      name and an unsigned integer value
 853  *                                      representing the port to listen on,
 854  *                                      separated by whitespace
 855  *                      size:           non-zero length of C string in @buf
 856  * Output:
 857  *      On success:     returns zero; NFS service is started
 858  *      On error:       return code is a negative errno value
 859  */
 860 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 861 {
 862         ssize_t rv;
 863
 864         mutex_lock(&nfsd_mutex);
 865         rv = __write_ports(file, buf, size, netns(file));
 866         mutex_unlock(&nfsd_mutex);
 867         return rv;
 868 }
 869
 870
 871 int nfsd_max_blksize;
 872
 873 /**
 874  * write_maxblksize - Set or report the current NFS blksize
 875  *
 876  * Input:
 877  *                      buf:            ignored
 878  *                      size:           zero
 879  *
 880  * OR
 881  *
 882  * Input:
 883  *                      buf:            C string containing an unsigned
 884  *                                      integer value representing the new
 885  *                                      NFS blksize
 886  *                      size:           non-zero length of C string in @buf
 887  * Output:
 888  *      On success:     passed-in buffer filled with '\n'-terminated C string
 889  *                      containing numeric value of the current NFS blksize
 890  *                      setting;
 891  *                      return code is the size in bytes of the string
 892  *      On error:       return code is zero or a negative errno value
 893  */
 894 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 895 {
 896         char *mesg = buf;
 897         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 898
 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                 bsize = max_t(int, bsize, 1024);
 908                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
 909                 bsize &= ~(1024-1);
 910                 mutex_lock(&nfsd_mutex);
 911                 if (nn->nfsd_serv) {
 912                         mutex_unlock(&nfsd_mutex);
 913                         return -EBUSY;
 914                 }
 915                 nfsd_max_blksize = bsize;
 916                 mutex_unlock(&nfsd_mutex);
 917         }
 918
 919         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 920                                                         nfsd_max_blksize);
 921 }
 922
 923 /**
 924  * write_maxconn - Set or report the current max number of connections
 925  *
 926  * Input:
 927  *                      buf:            ignored
 928  *                      size:           zero
 929  * OR
 930  *
 931  * Input:
 932  *                      buf:            C string containing an unsigned
 933  *                                      integer value representing the new
 934  *                                      number of max connections
 935  *                      size:           non-zero length of C string in @buf
 936  * Output:
 937  *      On success:     passed-in buffer filled with '\n'-terminated C string
 938  *                      containing numeric value of max_connections setting
 939  *                      for this net namespace;
 940  *                      return code is the size in bytes of the string
 941  *      On error:       return code is zero or a negative errno value
 942  */
 943 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
 944 {
 945         char *mesg = buf;
 946         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 947         unsigned int maxconn = nn->max_connections;
 948
 949         if (size > 0) {
 950                 int rv = get_uint(&mesg, &maxconn);
 951
 952                 if (rv)
 953                         return rv;
 954                 nn->max_connections = maxconn;
 955         }
 956
 957         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
 958 }
 959
 960 #ifdef CONFIG_NFSD_V4
 961 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
 962                                   time_t *time, struct nfsd_net *nn)
 963 {
 964         char *mesg = buf;
 965         int rv, i;
 966
 967         if (size > 0) {
 968                 if (nn->nfsd_serv)
 969                         return -EBUSY;
 970                 rv = get_int(&mesg, &i);
 971                 if (rv)
 972                         return rv;
 973                 /*
 974                  * Some sanity checking.  We don't have a reason for
 975                  * these particular numbers, but problems with the
 976                  * extremes are:
 977                  *      - Too short: the briefest network outage may
 978                  *        cause clients to lose all their locks.  Also,
 979                  *        the frequent polling may be wasteful.
 980                  *      - Too long: do you really want reboot recovery
 981                  *        to take more than an hour?  Or to make other
 982                  *        clients wait an hour before being able to
 983                  *        revoke a dead client's locks?
 984                  */
 985                 if (i < 10 || i > 3600)
 986                         return -EINVAL;
 987                 *time = i;
 988         }
 989
 990         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 991 }
 992
 993 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
 994                                 time_t *time, struct nfsd_net *nn)
 995 {
 996         ssize_t rv;
 997
 998         mutex_lock(&nfsd_mutex);
 999         rv = __nfsd4_write_time(file, buf, size, time, nn);
1000         mutex_unlock(&nfsd_mutex);
1001         return rv;
1002 }
1003
1004 /**
1005  * write_leasetime - Set or report the current NFSv4 lease time
1006  *
1007  * Input:
1008  *                      buf:            ignored
1009  *                      size:           zero
1010  *
1011  * OR
1012  *
1013  * Input:
1014  *                      buf:            C string containing an unsigned
1015  *                                      integer value representing the new
1016  *                                      NFSv4 lease expiry time
1017  *                      size:           non-zero length of C string in @buf
1018  * Output:
1019  *      On success:     passed-in buffer filled with '\n'-terminated C
1020  *                      string containing unsigned integer value of the
1021  *                      current lease expiry time;
1022  *                      return code is the size in bytes of the string
1023  *      On error:       return code is zero or a negative errno value
1024  */
1025 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1026 {
1027         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1028         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1029 }
1030
1031 /**
1032  * write_gracetime - Set or report current NFSv4 grace period time
1033  *
1034  * As above, but sets the time of the NFSv4 grace period.
1035  *
1036  * Note this should never be set to less than the *previous*
1037  * lease-period time, but we don't try to enforce this.  (In the common
1038  * case (a new boot), we don't know what the previous lease time was
1039  * anyway.)
1040  */
1041 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1042 {
1043         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1044         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1045 }
1046
1047 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1048                                    struct nfsd_net *nn)
1049 {
1050         char *mesg = buf;
1051         char *recdir;
1052         int len, status;
1053
1054         if (size > 0) {
1055                 if (nn->nfsd_serv)
1056                         return -EBUSY;
1057                 if (size > PATH_MAX || buf[size-1] != '\n')
1058                         return -EINVAL;
1059                 buf[size-1] = 0;
1060
1061                 recdir = mesg;
1062                 len = qword_get(&mesg, recdir, size);
1063                 if (len <= 0)
1064                         return -EINVAL;
1065
1066                 status = nfs4_reset_recoverydir(recdir);
1067                 if (status)
1068                         return status;
1069         }
1070
1071         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1072                                                         nfs4_recoverydir());
1073 }
1074
1075 /**
1076  * write_recoverydir - Set or report the pathname of the recovery directory
1077  *
1078  * Input:
1079  *                      buf:            ignored
1080  *                      size:           zero
1081  *
1082  * OR
1083  *
1084  * Input:
1085  *                      buf:            C string containing the pathname
1086  *                                      of the directory on a local file
1087  *                                      system containing permanent NFSv4
1088  *                                      recovery data
1089  *                      size:           non-zero length of C string in @buf
1090  * Output:
1091  *      On success:     passed-in buffer filled with '\n'-terminated C string
1092  *                      containing the current recovery pathname setting;
1093  *                      return code is the size in bytes of the string
1094  *      On error:       return code is zero or a negative errno value
1095  */
1096 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1097 {
1098         ssize_t rv;
1099         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1100
1101         mutex_lock(&nfsd_mutex);
1102         rv = __write_recoverydir(file, buf, size, nn);
1103         mutex_unlock(&nfsd_mutex);
1104         return rv;
1105 }
1106
1107 /**
1108  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1109  *
1110  * Input:
1111  *                      buf:            ignored
1112  *                      size:           zero
1113  * OR
1114  *
1115  * Input:
1116  *                      buf:            any value
1117  *                      size:           non-zero length of C string in @buf
1118  * Output:
1119  *                      passed-in buffer filled with "Y" or "N" with a newline
1120  *                      and NULL-terminated C string. This indicates whether
1121  *                      the grace period has ended in the current net
1122  *                      namespace. Return code is the size in bytes of the
1123  *                      string. Writing a string that starts with 'Y', 'y', or
1124  *                      '1' to the file will end the grace period for nfsd's v4
1125  *                      lock manager.
1126  */
1127 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1128 {
1129         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1130
1131         if (size > 0) {
1132                 switch(buf[0]) {
1133                 case 'Y':
1134                 case 'y':
1135                 case '1':
1136                         if (!nn->nfsd_serv)
1137                                 return -EBUSY;
1138                         nfsd4_end_grace(nn);
1139                         break;
1140                 default:
1141                         return -EINVAL;
1142                 }
1143         }
1144
1145         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1146                          nn->grace_ended ? 'Y' : 'N');
1147 }
1148
1149 #endif
1150
1151 /*----------------------------------------------------------------------------*/
1152 /*
1153  *      populating the filesystem.
1154  */
1155
1156 /* Basically copying rpc_get_inode. */
1157 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1158 {
1159         struct inode *inode = new_inode(sb);
1160         if (!inode)
1161                 return NULL;
1162         /* Following advice from simple_fill_super documentation: */
1163         inode->i_ino = iunique(sb, NFSD_MaxReserved);
1164         inode->i_mode = mode;
1165         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1166         switch (mode & S_IFMT) {
1167         case S_IFDIR:
1168                 inode->i_fop = &simple_dir_operations;
1169                 inode->i_op = &simple_dir_inode_operations;
1170                 inc_nlink(inode);
1171         default:
1172                 break;
1173         }
1174         return inode;
1175 }
1176
1177 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1178 {
1179         struct inode *inode;
1180
1181         inode = nfsd_get_inode(dir->i_sb, mode);
1182         if (!inode)
1183                 return -ENOMEM;
1184         if (ncl) {
1185                 inode->i_private = ncl;
1186                 kref_get(&ncl->cl_ref);
1187         }
1188         d_add(dentry, inode);
1189         inc_nlink(dir);
1190         fsnotify_mkdir(dir, dentry);
1191         return 0;
1192 }
1193
1194 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1195 {
1196         struct inode *dir = parent->d_inode;
1197         struct dentry *dentry;
1198         int ret = -ENOMEM;
1199
1200         inode_lock(dir);
1201         dentry = d_alloc_name(parent, name);
1202         if (!dentry)
1203                 goto out_err;
1204         ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1205         if (ret)
1206                 goto out_err;
1207 out:
1208         inode_unlock(dir);
1209         return dentry;
1210 out_err:
1211         dput(dentry);
1212         dentry = ERR_PTR(ret);
1213         goto out;
1214 }
1215
1216 static void clear_ncl(struct inode *inode)
1217 {
1218         struct nfsdfs_client *ncl = inode->i_private;
1219
1220         inode->i_private = NULL;
1221         kref_put(&ncl->cl_ref, ncl->cl_release);
1222 }
1223
1224 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1225 {
1226         struct nfsdfs_client *nc = inode->i_private;
1227
1228         if (nc)
1229                 kref_get(&nc->cl_ref);
1230         return nc;
1231 }
1232
1233 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1234 {
1235         struct nfsdfs_client *nc;
1236
1237         inode_lock_shared(inode);
1238         nc = __get_nfsdfs_client(inode);
1239         inode_unlock_shared(inode);
1240         return nc;
1241 }
1242 /* from __rpc_unlink */
1243 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1244 {
1245         int ret;
1246
1247         clear_ncl(d_inode(dentry));
1248         dget(dentry);
1249         ret = simple_unlink(dir, dentry);
1250         d_drop(dentry);
1251         fsnotify_unlink(dir, dentry);
1252         dput(dentry);
1253         WARN_ON_ONCE(ret);
1254 }
1255
1256 static void nfsdfs_remove_files(struct dentry *root)
1257 {
1258         struct dentry *dentry, *tmp;
1259
1260         list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1261                 if (!simple_positive(dentry)) {
1262                         WARN_ON_ONCE(1); /* I think this can't happen? */
1263                         continue;
1264                 }
1265                 nfsdfs_remove_file(d_inode(root), dentry);
1266         }
1267 }
1268
1269 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1270  * code instead. */
1271 static  int nfsdfs_create_files(struct dentry *root,
1272                                         const struct tree_descr *files)
1273 {
1274         struct inode *dir = d_inode(root);
1275         struct inode *inode;
1276         struct dentry *dentry;
1277         int i;
1278
1279         inode_lock(dir);
1280         for (i = 0; files->name && files->name[0]; i++, files++) {
1281                 if (!files->name)
1282                         continue;
1283                 dentry = d_alloc_name(root, files->name);
1284                 if (!dentry)
1285                         goto out;
1286                 inode = nfsd_get_inode(d_inode(root)->i_sb,
1287                                         S_IFREG | files->mode);
1288                 if (!inode) {
1289                         dput(dentry);
1290                         goto out;
1291                 }
1292                 inode->i_fop = files->ops;
1293                 inode->i_private = __get_nfsdfs_client(dir);
1294                 d_add(dentry, inode);
1295                 fsnotify_create(dir, dentry);
1296         }
1297         inode_unlock(dir);
1298         return 0;
1299 out:
1300         nfsdfs_remove_files(root);
1301         inode_unlock(dir);
1302         return -ENOMEM;
1303 }
1304
1305 /* on success, returns positive number unique to that client. */
1306 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1307                 struct nfsdfs_client *ncl, u32 id,
1308                 const struct tree_descr *files)
1309 {
1310         struct dentry *dentry;
1311         char name[11];
1312         int ret;
1313
1314         sprintf(name, "%u", id);
1315
1316         dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1317         if (IS_ERR(dentry)) /* XXX: tossing errors? */
1318                 return NULL;
1319         ret = nfsdfs_create_files(dentry, files);
1320         if (ret) {
1321                 nfsd_client_rmdir(dentry);
1322                 return NULL;
1323         }
1324         return dentry;
1325 }
1326
1327 /* Taken from __rpc_rmdir: */
1328 void nfsd_client_rmdir(struct dentry *dentry)
1329 {
1330         struct inode *dir = d_inode(dentry->d_parent);
1331         struct inode *inode = d_inode(dentry);
1332         int ret;
1333
1334         inode_lock(dir);
1335         nfsdfs_remove_files(dentry);
1336         clear_ncl(inode);
1337         dget(dentry);
1338         ret = simple_rmdir(dir, dentry);
1339         WARN_ON_ONCE(ret);
1340         d_drop(dentry);
1341         fsnotify_rmdir(dir, dentry);
1342         dput(dentry);
1343         inode_unlock(dir);
1344 }
1345
1346 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1347 {
1348         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1349                                                         nfsd_net_id);
1350         struct dentry *dentry;
1351         int ret;
1352
1353         static const struct tree_descr nfsd_files[] = {
1354                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1355                 [NFSD_Export_features] = {"export_features",
1356                                         &export_features_operations, S_IRUGO},
1357                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1358                                         &transaction_ops, S_IWUSR|S_IRUSR},
1359                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1360                                         &transaction_ops, S_IWUSR|S_IRUSR},
1361                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1362                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1363                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1364                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1365                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1366                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1367                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1368                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1369                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1370 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1371                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1372 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1373 #ifdef CONFIG_NFSD_V4
1374                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1375                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1376                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1377                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1378 #endif
1379                 /* last one */ {""}
1380         };
1381
1382         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1383         if (ret)
1384                 return ret;
1385         dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1386         if (IS_ERR(dentry))
1387                 return PTR_ERR(dentry);
1388         nn->nfsd_client_dir = dentry;
1389         return 0;
1390 }
1391
1392 static int nfsd_fs_get_tree(struct fs_context *fc)
1393 {
1394         return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1395 }
1396
1397 static void nfsd_fs_free_fc(struct fs_context *fc)
1398 {
1399         if (fc->s_fs_info)
1400                 put_net(fc->s_fs_info);
1401 }
1402
1403 static const struct fs_context_operations nfsd_fs_context_ops = {
1404         .free           = nfsd_fs_free_fc,
1405         .get_tree       = nfsd_fs_get_tree,
1406 };
1407
1408 static int nfsd_init_fs_context(struct fs_context *fc)
1409 {
1410         put_user_ns(fc->user_ns);
1411         fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1412         fc->ops = &nfsd_fs_context_ops;
1413         return 0;
1414 }
1415
1416 static void nfsd_umount(struct super_block *sb)
1417 {
1418         struct net *net = sb->s_fs_info;
1419
1420         nfsd_shutdown_threads(net);
1421
1422         kill_litter_super(sb);
1423         put_net(net);
1424 }
1425
1426 static struct file_system_type nfsd_fs_type = {
1427         .owner          = THIS_MODULE,
1428         .name           = "nfsd",
1429         .init_fs_context = nfsd_init_fs_context,
1430         .kill_sb        = nfsd_umount,
1431 };
1432 MODULE_ALIAS_FS("nfsd");
1433
1434 #ifdef CONFIG_PROC_FS
1435 static int create_proc_exports_entry(void)
1436 {
1437         struct proc_dir_entry *entry;
1438
1439         entry = proc_mkdir("fs/nfs", NULL);
1440         if (!entry)
1441                 return -ENOMEM;
1442         entry = proc_create("exports", 0, entry,
1443                                  &exports_proc_operations);
1444         if (!entry) {
1445                 remove_proc_entry("fs/nfs", NULL);
1446                 return -ENOMEM;
1447         }
1448         return 0;
1449 }
1450 #else /* CONFIG_PROC_FS */
1451 static int create_proc_exports_entry(void)
1452 {
1453         return 0;
1454 }
1455 #endif
1456
1457 unsigned int nfsd_net_id;
1458
1459 static __net_init int nfsd_init_net(struct net *net)
1460 {
1461         int retval;
1462         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1463
1464         retval = nfsd_export_init(net);
1465         if (retval)
1466                 goto out_export_error;
1467         retval = nfsd_idmap_init(net);
1468         if (retval)
1469                 goto out_idmap_error;
1470         nn->nfsd_versions = NULL;
1471         nn->nfsd4_minorversions = NULL;
1472         retval = nfsd_reply_cache_init(nn);
1473         if (retval)
1474                 goto out_drc_error;
1475         nn->nfsd4_lease = 90;   /* default lease time */
1476         nn->nfsd4_grace = 90;
1477         nn->somebody_reclaimed = false;
1478         nn->track_reclaim_completes = false;
1479         nn->clverifier_counter = prandom_u32();
1480         nn->clientid_base = prandom_u32();
1481         nn->clientid_counter = nn->clientid_base + 1;
1482         nn->s2s_cp_cl_id = nn->clientid_counter++;
1483
1484         atomic_set(&nn->ntf_refcnt, 0);
1485         init_waitqueue_head(&nn->ntf_wq);
1486         seqlock_init(&nn->boot_lock);
1487
1488         return 0;
1489
1490 out_drc_error:
1491         nfsd_idmap_shutdown(net);
1492 out_idmap_error:
1493         nfsd_export_shutdown(net);
1494 out_export_error:
1495         return retval;
1496 }
1497
1498 static __net_exit void nfsd_exit_net(struct net *net)
1499 {
1500         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1501
1502         nfsd_reply_cache_shutdown(nn);
1503         nfsd_idmap_shutdown(net);
1504         nfsd_export_shutdown(net);
1505         nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1506 }
1507
1508 static struct pernet_operations nfsd_net_ops = {
1509         .init = nfsd_init_net,
1510         .exit = nfsd_exit_net,
1511         .id   = &nfsd_net_id,
1512         .size = sizeof(struct nfsd_net),
1513 };
1514
1515 static int __init init_nfsd(void)
1516 {
1517         int retval;
1518         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1519
1520         retval = nfsd4_init_slabs();
1521         if (retval)
1522                 return retval;
1523         retval = nfsd4_init_pnfs();
1524         if (retval)
1525                 goto out_free_slabs;
1526         nfsd_fault_inject_init(); /* nfsd fault injection controls */
1527         nfsd_stat_init();       /* Statistics */
1528         retval = nfsd_drc_slab_create();
1529         if (retval)
1530                 goto out_free_stat;
1531         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1532         retval = create_proc_exports_entry();
1533         if (retval)
1534                 goto out_free_lockd;
1535         retval = register_filesystem(&nfsd_fs_type);
1536         if (retval)
1537                 goto out_free_exports;
1538         retval = register_pernet_subsys(&nfsd_net_ops);
1539         if (retval < 0)
1540                 goto out_free_filesystem;
1541         retval = register_cld_notifier();
1542         if (retval)
1543                 goto out_free_all;
1544         return 0;
1545 out_free_all:
1546         unregister_pernet_subsys(&nfsd_net_ops);
1547 out_free_filesystem:
1548         unregister_filesystem(&nfsd_fs_type);
1549 out_free_exports:
1550         remove_proc_entry("fs/nfs/exports", NULL);
1551         remove_proc_entry("fs/nfs", NULL);
1552 out_free_lockd:
1553         nfsd_lockd_shutdown();
1554         nfsd_drc_slab_free();
1555 out_free_stat:
1556         nfsd_stat_shutdown();
1557         nfsd_fault_inject_cleanup();
1558         nfsd4_exit_pnfs();
1559 out_free_slabs:
1560         nfsd4_free_slabs();
1561         return retval;
1562 }
1563
1564 static void __exit exit_nfsd(void)
1565 {
1566         unregister_cld_notifier();
1567         unregister_pernet_subsys(&nfsd_net_ops);
1568         nfsd_drc_slab_free();
1569         remove_proc_entry("fs/nfs/exports", NULL);
1570         remove_proc_entry("fs/nfs", NULL);
1571         nfsd_stat_shutdown();
1572         nfsd_lockd_shutdown();
1573         nfsd4_free_slabs();
1574         nfsd4_exit_pnfs();
1575         nfsd_fault_inject_cleanup();
1576         unregister_filesystem(&nfsd_fs_type);
1577 }
1578
1579 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1580 MODULE_LICENSE("GPL");
1581 module_init(init_nfsd)
1582 module_exit(exit_nfsd)