fs/nfsd/nfsctl.c

   1 /*
   2  * Syscall interface to knfsd.
   3  *
   4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/namei.h>
   9 #include <linux/ctype.h>
  10
  11 #include <linux/sunrpc/svcsock.h>
  12 #include <linux/lockd/lockd.h>
  13 #include <linux/sunrpc/addr.h>
  14 #include <linux/sunrpc/gss_api.h>
  15 #include <linux/sunrpc/gss_krb5_enctypes.h>
  16 #include <linux/sunrpc/rpc_pipe_fs.h>
  17 #include <linux/module.h>
  18
  19 #include "idmap.h"
  20 #include "nfsd.h"
  21 #include "cache.h"
  22 #include "state.h"
  23 #include "netns.h"
  24
  25 /*
  26  *      We have a single directory with several nodes in it.
  27  */
  28 enum {
  29         NFSD_Root = 1,
  30         NFSD_List,
  31         NFSD_Export_features,
  32         NFSD_Fh,
  33         NFSD_FO_UnlockIP,
  34         NFSD_FO_UnlockFS,
  35         NFSD_Threads,
  36         NFSD_Pool_Threads,
  37         NFSD_Pool_Stats,
  38         NFSD_Reply_Cache_Stats,
  39         NFSD_Versions,
  40         NFSD_Ports,
  41         NFSD_MaxBlkSize,
  42         NFSD_SupportedEnctypes,
  43         /*
  44          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  45          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  46          */
  47 #ifdef CONFIG_NFSD_V4
  48         NFSD_Leasetime,
  49         NFSD_Gracetime,
  50         NFSD_RecoveryDir,
  51 #endif
  52 };
  53
  54 /*
  55  * write() for these nodes.
  56  */
  57 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  58 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  59 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  60 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  61 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  62 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  63 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  64 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  65 #ifdef CONFIG_NFSD_V4
  66 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  67 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  68 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  69 #endif
  70
  71 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  72         [NFSD_Fh] = write_filehandle,
  73         [NFSD_FO_UnlockIP] = write_unlock_ip,
  74         [NFSD_FO_UnlockFS] = write_unlock_fs,
  75         [NFSD_Threads] = write_threads,
  76         [NFSD_Pool_Threads] = write_pool_threads,
  77         [NFSD_Versions] = write_versions,
  78         [NFSD_Ports] = write_ports,
  79         [NFSD_MaxBlkSize] = write_maxblksize,
  80 #ifdef CONFIG_NFSD_V4
  81         [NFSD_Leasetime] = write_leasetime,
  82         [NFSD_Gracetime] = write_gracetime,
  83         [NFSD_RecoveryDir] = write_recoverydir,
  84 #endif
  85 };
  86
  87 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  88 {
  89         ino_t ino =  file_inode(file)->i_ino;
  90         char *data;
  91         ssize_t rv;
  92
  93         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
  94                 return -EINVAL;
  95
  96         data = simple_transaction_get(file, buf, size);
  97         if (IS_ERR(data))
  98                 return PTR_ERR(data);
  99
 100         rv =  write_op[ino](file, data, size);
 101         if (rv >= 0) {
 102                 simple_transaction_set(file, rv);
 103                 rv = size;
 104         }
 105         return rv;
 106 }
 107
 108 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 109 {
 110         if (! file->private_data) {
 111                 /* An attempt to read a transaction file without writing
 112                  * causes a 0-byte write so that the file can return
 113                  * state information
 114                  */
 115                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 116                 if (rv < 0)
 117                         return rv;
 118         }
 119         return simple_transaction_read(file, buf, size, pos);
 120 }
 121
 122 static const struct file_operations transaction_ops = {
 123         .write          = nfsctl_transaction_write,
 124         .read           = nfsctl_transaction_read,
 125         .release        = simple_transaction_release,
 126         .llseek         = default_llseek,
 127 };
 128
 129 static int exports_net_open(struct net *net, struct file *file)
 130 {
 131         int err;
 132         struct seq_file *seq;
 133         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 134
 135         err = seq_open(file, &nfs_exports_op);
 136         if (err)
 137                 return err;
 138
 139         seq = file->private_data;
 140         seq->private = nn->svc_export_cache;
 141         return 0;
 142 }
 143
 144 static int exports_proc_open(struct inode *inode, struct file *file)
 145 {
 146         return exports_net_open(current->nsproxy->net_ns, file);
 147 }
 148
 149 static const struct file_operations exports_proc_operations = {
 150         .open           = exports_proc_open,
 151         .read           = seq_read,
 152         .llseek         = seq_lseek,
 153         .release        = seq_release,
 154         .owner          = THIS_MODULE,
 155 };
 156
 157 static int exports_nfsd_open(struct inode *inode, struct file *file)
 158 {
 159         return exports_net_open(inode->i_sb->s_fs_info, file);
 160 }
 161
 162 static const struct file_operations exports_nfsd_operations = {
 163         .open           = exports_nfsd_open,
 164         .read           = seq_read,
 165         .llseek         = seq_lseek,
 166         .release        = seq_release,
 167         .owner          = THIS_MODULE,
 168 };
 169
 170 static int export_features_show(struct seq_file *m, void *v)
 171 {
 172         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 173         return 0;
 174 }
 175
 176 static int export_features_open(struct inode *inode, struct file *file)
 177 {
 178         return single_open(file, export_features_show, NULL);
 179 }
 180
 181 static const struct file_operations export_features_operations = {
 182         .open           = export_features_open,
 183         .read           = seq_read,
 184         .llseek         = seq_lseek,
 185         .release        = single_release,
 186 };
 187
 188 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 189 static int supported_enctypes_show(struct seq_file *m, void *v)
 190 {
 191         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 192         return 0;
 193 }
 194
 195 static int supported_enctypes_open(struct inode *inode, struct file *file)
 196 {
 197         return single_open(file, supported_enctypes_show, NULL);
 198 }
 199
 200 static const struct file_operations supported_enctypes_ops = {
 201         .open           = supported_enctypes_open,
 202         .read           = seq_read,
 203         .llseek         = seq_lseek,
 204         .release        = single_release,
 205 };
 206 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 207
 208 static const struct file_operations pool_stats_operations = {
 209         .open           = nfsd_pool_stats_open,
 210         .read           = seq_read,
 211         .llseek         = seq_lseek,
 212         .release        = nfsd_pool_stats_release,
 213         .owner          = THIS_MODULE,
 214 };
 215
 216 static struct file_operations reply_cache_stats_operations = {
 217         .open           = nfsd_reply_cache_stats_open,
 218         .read           = seq_read,
 219         .llseek         = seq_lseek,
 220         .release        = single_release,
 221 };
 222
 223 /*----------------------------------------------------------------------------*/
 224 /*
 225  * payload - write methods
 226  */
 227
 228
 229 /**
 230  * write_unlock_ip - Release all locks used by a client
 231  *
 232  * Experimental.
 233  *
 234  * Input:
 235  *                      buf:    '\n'-terminated C string containing a
 236  *                              presentation format IP address
 237  *                      size:   length of C string in @buf
 238  * Output:
 239  *      On success:     returns zero if all specified locks were released;
 240  *                      returns one if one or more locks were not released
 241  *      On error:       return code is negative errno value
 242  */
 243 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 244 {
 245         struct sockaddr_storage address;
 246         struct sockaddr *sap = (struct sockaddr *)&address;
 247         size_t salen = sizeof(address);
 248         char *fo_path;
 249         struct net *net = file->f_dentry->d_sb->s_fs_info;
 250
 251         /* sanity check */
 252         if (size == 0)
 253                 return -EINVAL;
 254
 255         if (buf[size-1] != '\n')
 256                 return -EINVAL;
 257
 258         fo_path = buf;
 259         if (qword_get(&buf, fo_path, size) < 0)
 260                 return -EINVAL;
 261
 262         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
 263                 return -EINVAL;
 264
 265         return nlmsvc_unlock_all_by_ip(sap);
 266 }
 267
 268 /**
 269  * write_unlock_fs - Release all locks on a local file system
 270  *
 271  * Experimental.
 272  *
 273  * Input:
 274  *                      buf:    '\n'-terminated C string containing the
 275  *                              absolute pathname of a local file system
 276  *                      size:   length of C string in @buf
 277  * Output:
 278  *      On success:     returns zero if all specified locks were released;
 279  *                      returns one if one or more locks were not released
 280  *      On error:       return code is negative errno value
 281  */
 282 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 283 {
 284         struct path path;
 285         char *fo_path;
 286         int error;
 287
 288         /* sanity check */
 289         if (size == 0)
 290                 return -EINVAL;
 291
 292         if (buf[size-1] != '\n')
 293                 return -EINVAL;
 294
 295         fo_path = buf;
 296         if (qword_get(&buf, fo_path, size) < 0)
 297                 return -EINVAL;
 298
 299         error = kern_path(fo_path, 0, &path);
 300         if (error)
 301                 return error;
 302
 303         /*
 304          * XXX: Needs better sanity checking.  Otherwise we could end up
 305          * releasing locks on the wrong file system.
 306          *
 307          * For example:
 308          * 1.  Does the path refer to a directory?
 309          * 2.  Is that directory a mount point, or
 310          * 3.  Is that directory the root of an exported file system?
 311          */
 312         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 313
 314         path_put(&path);
 315         return error;
 316 }
 317
 318 /**
 319  * write_filehandle - Get a variable-length NFS file handle by path
 320  *
 321  * On input, the buffer contains a '\n'-terminated C string comprised of
 322  * three alphanumeric words separated by whitespace.  The string may
 323  * contain escape sequences.
 324  *
 325  * Input:
 326  *                      buf:
 327  *                              domain:         client domain name
 328  *                              path:           export pathname
 329  *                              maxsize:        numeric maximum size of
 330  *                                              @buf
 331  *                      size:   length of C string in @buf
 332  * Output:
 333  *      On success:     passed-in buffer filled with '\n'-terminated C
 334  *                      string containing a ASCII hex text version
 335  *                      of the NFS file handle;
 336  *                      return code is the size in bytes of the string
 337  *      On error:       return code is negative errno value
 338  */
 339 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 340 {
 341         char *dname, *path;
 342         int uninitialized_var(maxsize);
 343         char *mesg = buf;
 344         int len;
 345         struct auth_domain *dom;
 346         struct knfsd_fh fh;
 347         struct net *net = file->f_dentry->d_sb->s_fs_info;
 348
 349         if (size == 0)
 350                 return -EINVAL;
 351
 352         if (buf[size-1] != '\n')
 353                 return -EINVAL;
 354         buf[size-1] = 0;
 355
 356         dname = mesg;
 357         len = qword_get(&mesg, dname, size);
 358         if (len <= 0)
 359                 return -EINVAL;
 360
 361         path = dname+len+1;
 362         len = qword_get(&mesg, path, size);
 363         if (len <= 0)
 364                 return -EINVAL;
 365
 366         len = get_int(&mesg, &maxsize);
 367         if (len)
 368                 return len;
 369
 370         if (maxsize < NFS_FHSIZE)
 371                 return -EINVAL;
 372         if (maxsize > NFS3_FHSIZE)
 373                 maxsize = NFS3_FHSIZE;
 374
 375         if (qword_get(&mesg, mesg, size)>0)
 376                 return -EINVAL;
 377
 378         /* we have all the words, they are in buf.. */
 379         dom = unix_domain_find(dname);
 380         if (!dom)
 381                 return -ENOMEM;
 382
 383         len = exp_rootfh(net, dom, path, &fh,  maxsize);
 384         auth_domain_put(dom);
 385         if (len)
 386                 return len;
 387
 388         mesg = buf;
 389         len = SIMPLE_TRANSACTION_LIMIT;
 390         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 391         mesg[-1] = '\n';
 392         return mesg - buf;
 393 }
 394
 395 /**
 396  * write_threads - Start NFSD, or report the current number of running threads
 397  *
 398  * Input:
 399  *                      buf:            ignored
 400  *                      size:           zero
 401  * Output:
 402  *      On success:     passed-in buffer filled with '\n'-terminated C
 403  *                      string numeric value representing the number of
 404  *                      running NFSD threads;
 405  *                      return code is the size in bytes of the string
 406  *      On error:       return code is zero
 407  *
 408  * OR
 409  *
 410  * Input:
 411  *                      buf:            C string containing an unsigned
 412  *                                      integer value representing the
 413  *                                      number of NFSD threads to start
 414  *                      size:           non-zero length of C string in @buf
 415  * Output:
 416  *      On success:     NFS service is started;
 417  *                      passed-in buffer filled with '\n'-terminated C
 418  *                      string numeric value representing the number of
 419  *                      running NFSD threads;
 420  *                      return code is the size in bytes of the string
 421  *      On error:       return code is zero or a negative errno value
 422  */
 423 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 424 {
 425         char *mesg = buf;
 426         int rv;
 427         struct net *net = file->f_dentry->d_sb->s_fs_info;
 428
 429         if (size > 0) {
 430                 int newthreads;
 431                 rv = get_int(&mesg, &newthreads);
 432                 if (rv)
 433                         return rv;
 434                 if (newthreads < 0)
 435                         return -EINVAL;
 436                 rv = nfsd_svc(newthreads, net);
 437                 if (rv < 0)
 438                         return rv;
 439         } else
 440                 rv = nfsd_nrthreads(net);
 441
 442         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 443 }
 444
 445 /**
 446  * write_pool_threads - Set or report the current number of threads per pool
 447  *
 448  * Input:
 449  *                      buf:            ignored
 450  *                      size:           zero
 451  *
 452  * OR
 453  *
 454  * Input:
 455  *                      buf:            C string containing whitespace-
 456  *                                      separated unsigned integer values
 457  *                                      representing the number of NFSD
 458  *                                      threads to start in each pool
 459  *                      size:           non-zero length of C string in @buf
 460  * Output:
 461  *      On success:     passed-in buffer filled with '\n'-terminated C
 462  *                      string containing integer values representing the
 463  *                      number of NFSD threads in each pool;
 464  *                      return code is the size in bytes of the string
 465  *      On error:       return code is zero or a negative errno value
 466  */
 467 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 468 {
 469         /* if size > 0, look for an array of number of threads per node
 470          * and apply them  then write out number of threads per node as reply
 471          */
 472         char *mesg = buf;
 473         int i;
 474         int rv;
 475         int len;
 476         int npools;
 477         int *nthreads;
 478         struct net *net = file->f_dentry->d_sb->s_fs_info;
 479
 480         mutex_lock(&nfsd_mutex);
 481         npools = nfsd_nrpools(net);
 482         if (npools == 0) {
 483                 /*
 484                  * NFS is shut down.  The admin can start it by
 485                  * writing to the threads file but NOT the pool_threads
 486                  * file, sorry.  Report zero threads.
 487                  */
 488                 mutex_unlock(&nfsd_mutex);
 489                 strcpy(buf, "0\n");
 490                 return strlen(buf);
 491         }
 492
 493         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 494         rv = -ENOMEM;
 495         if (nthreads == NULL)
 496                 goto out_free;
 497
 498         if (size > 0) {
 499                 for (i = 0; i < npools; i++) {
 500                         rv = get_int(&mesg, &nthreads[i]);
 501                         if (rv == -ENOENT)
 502                                 break;          /* fewer numbers than pools */
 503                         if (rv)
 504                                 goto out_free;  /* syntax error */
 505                         rv = -EINVAL;
 506                         if (nthreads[i] < 0)
 507                                 goto out_free;
 508                 }
 509                 rv = nfsd_set_nrthreads(i, nthreads, net);
 510                 if (rv)
 511                         goto out_free;
 512         }
 513
 514         rv = nfsd_get_nrthreads(npools, nthreads, net);
 515         if (rv)
 516                 goto out_free;
 517
 518         mesg = buf;
 519         size = SIMPLE_TRANSACTION_LIMIT;
 520         for (i = 0; i < npools && size > 0; i++) {
 521                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 522                 len = strlen(mesg);
 523                 size -= len;
 524                 mesg += len;
 525         }
 526         rv = mesg - buf;
 527 out_free:
 528         kfree(nthreads);
 529         mutex_unlock(&nfsd_mutex);
 530         return rv;
 531 }
 532
 533 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 534 {
 535         char *mesg = buf;
 536         char *vers, *minorp, sign;
 537         int len, num, remaining;
 538         unsigned minor;
 539         ssize_t tlen = 0;
 540         char *sep;
 541         struct net *net = file->f_dentry->d_sb->s_fs_info;
 542         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 543
 544         if (size>0) {
 545                 if (nn->nfsd_serv)
 546                         /* Cannot change versions without updating
 547                          * nn->nfsd_serv->sv_xdrsize, and reallocing
 548                          * rq_argp and rq_resp
 549                          */
 550                         return -EBUSY;
 551                 if (buf[size-1] != '\n')
 552                         return -EINVAL;
 553                 buf[size-1] = 0;
 554
 555                 vers = mesg;
 556                 len = qword_get(&mesg, vers, size);
 557                 if (len <= 0) return -EINVAL;
 558                 do {
 559                         sign = *vers;
 560                         if (sign == '+' || sign == '-')
 561                                 num = simple_strtol((vers+1), &minorp, 0);
 562                         else
 563                                 num = simple_strtol(vers, &minorp, 0);
 564                         if (*minorp == '.') {
 565                                 if (num != 4)
 566                                         return -EINVAL;
 567                                 minor = simple_strtoul(minorp+1, NULL, 0);
 568                                 if (minor == 0)
 569                                         return -EINVAL;
 570                                 if (nfsd_minorversion(minor, sign == '-' ?
 571                                                      NFSD_CLEAR : NFSD_SET) < 0)
 572                                         return -EINVAL;
 573                                 goto next;
 574                         }
 575                         switch(num) {
 576                         case 2:
 577                         case 3:
 578                         case 4:
 579                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 580                                 break;
 581                         default:
 582                                 return -EINVAL;
 583                         }
 584                 next:
 585                         vers += len + 1;
 586                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 587                 /* If all get turned off, turn them back on, as
 588                  * having no versions is BAD
 589                  */
 590                 nfsd_reset_versions();
 591         }
 592
 593         /* Now write current state into reply buffer */
 594         len = 0;
 595         sep = "";
 596         remaining = SIMPLE_TRANSACTION_LIMIT;
 597         for (num=2 ; num <= 4 ; num++)
 598                 if (nfsd_vers(num, NFSD_AVAIL)) {
 599                         len = snprintf(buf, remaining, "%s%c%d", sep,
 600                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 601                                        num);
 602                         sep = " ";
 603
 604                         if (len > remaining)
 605                                 break;
 606                         remaining -= len;
 607                         buf += len;
 608                         tlen += len;
 609                 }
 610         if (nfsd_vers(4, NFSD_AVAIL))
 611                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 612                      minor++) {
 613                         len = snprintf(buf, remaining, " %c4.%u",
 614                                         (nfsd_vers(4, NFSD_TEST) &&
 615                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 616                                                 '+' : '-',
 617                                         minor);
 618
 619                         if (len > remaining)
 620                                 break;
 621                         remaining -= len;
 622                         buf += len;
 623                         tlen += len;
 624                 }
 625
 626         len = snprintf(buf, remaining, "\n");
 627         if (len > remaining)
 628                 return -EINVAL;
 629         return tlen + len;
 630 }
 631
 632 /**
 633  * write_versions - Set or report the available NFS protocol versions
 634  *
 635  * Input:
 636  *                      buf:            ignored
 637  *                      size:           zero
 638  * Output:
 639  *      On success:     passed-in buffer filled with '\n'-terminated C
 640  *                      string containing positive or negative integer
 641  *                      values representing the current status of each
 642  *                      protocol version;
 643  *                      return code is the size in bytes of the string
 644  *      On error:       return code is zero or a negative errno value
 645  *
 646  * OR
 647  *
 648  * Input:
 649  *                      buf:            C string containing whitespace-
 650  *                                      separated positive or negative
 651  *                                      integer values representing NFS
 652  *                                      protocol versions to enable ("+n")
 653  *                                      or disable ("-n")
 654  *                      size:           non-zero length of C string in @buf
 655  * Output:
 656  *      On success:     status of zero or more protocol versions has
 657  *                      been updated; passed-in buffer filled with
 658  *                      '\n'-terminated C string containing positive
 659  *                      or negative integer values representing the
 660  *                      current status of each protocol version;
 661  *                      return code is the size in bytes of the string
 662  *      On error:       return code is zero or a negative errno value
 663  */
 664 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 665 {
 666         ssize_t rv;
 667
 668         mutex_lock(&nfsd_mutex);
 669         rv = __write_versions(file, buf, size);
 670         mutex_unlock(&nfsd_mutex);
 671         return rv;
 672 }
 673
 674 /*
 675  * Zero-length write.  Return a list of NFSD's current listener
 676  * transports.
 677  */
 678 static ssize_t __write_ports_names(char *buf, struct net *net)
 679 {
 680         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 681
 682         if (nn->nfsd_serv == NULL)
 683                 return 0;
 684         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 685 }
 686
 687 /*
 688  * A single 'fd' number was written, in which case it must be for
 689  * a socket of a supported family/protocol, and we use it as an
 690  * nfsd listener.
 691  */
 692 static ssize_t __write_ports_addfd(char *buf, struct net *net)
 693 {
 694         char *mesg = buf;
 695         int fd, err;
 696         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 697
 698         err = get_int(&mesg, &fd);
 699         if (err != 0 || fd < 0)
 700                 return -EINVAL;
 701
 702         err = nfsd_create_serv(net);
 703         if (err != 0)
 704                 return err;
 705
 706         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 707         if (err < 0) {
 708                 nfsd_destroy(net);
 709                 return err;
 710         }
 711
 712         /* Decrease the count, but don't shut down the service */
 713         nn->nfsd_serv->sv_nrthreads--;
 714         return err;
 715 }
 716
 717 /*
 718  * A transport listener is added by writing it's transport name and
 719  * a port number.
 720  */
 721 static ssize_t __write_ports_addxprt(char *buf, struct net *net)
 722 {
 723         char transport[16];
 724         struct svc_xprt *xprt;
 725         int port, err;
 726         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 727
 728         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
 729                 return -EINVAL;
 730
 731         if (port < 1 || port > USHRT_MAX)
 732                 return -EINVAL;
 733
 734         err = nfsd_create_serv(net);
 735         if (err != 0)
 736                 return err;
 737
 738         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 739                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 740         if (err < 0)
 741                 goto out_err;
 742
 743         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 744                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
 745         if (err < 0 && err != -EAFNOSUPPORT)
 746                 goto out_close;
 747
 748         /* Decrease the count, but don't shut down the service */
 749         nn->nfsd_serv->sv_nrthreads--;
 750         return 0;
 751 out_close:
 752         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
 753         if (xprt != NULL) {
 754                 svc_close_xprt(xprt);
 755                 svc_xprt_put(xprt);
 756         }
 757 out_err:
 758         nfsd_destroy(net);
 759         return err;
 760 }
 761
 762 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
 763                              struct net *net)
 764 {
 765         if (size == 0)
 766                 return __write_ports_names(buf, net);
 767
 768         if (isdigit(buf[0]))
 769                 return __write_ports_addfd(buf, net);
 770
 771         if (isalpha(buf[0]))
 772                 return __write_ports_addxprt(buf, net);
 773
 774         return -EINVAL;
 775 }
 776
 777 /**
 778  * write_ports - Pass a socket file descriptor or transport name to listen on
 779  *
 780  * Input:
 781  *                      buf:            ignored
 782  *                      size:           zero
 783  * Output:
 784  *      On success:     passed-in buffer filled with a '\n'-terminated C
 785  *                      string containing a whitespace-separated list of
 786  *                      named NFSD listeners;
 787  *                      return code is the size in bytes of the string
 788  *      On error:       return code is zero or a negative errno value
 789  *
 790  * OR
 791  *
 792  * Input:
 793  *                      buf:            C string containing an unsigned
 794  *                                      integer value representing a bound
 795  *                                      but unconnected socket that is to be
 796  *                                      used as an NFSD listener; listen(3)
 797  *                                      must be called for a SOCK_STREAM
 798  *                                      socket, otherwise it is ignored
 799  *                      size:           non-zero length of C string in @buf
 800  * Output:
 801  *      On success:     NFS service is started;
 802  *                      passed-in buffer filled with a '\n'-terminated C
 803  *                      string containing a unique alphanumeric name of
 804  *                      the listener;
 805  *                      return code is the size in bytes of the string
 806  *      On error:       return code is a negative errno value
 807  *
 808  * OR
 809  *
 810  * Input:
 811  *                      buf:            C string containing a transport
 812  *                                      name and an unsigned integer value
 813  *                                      representing the port to listen on,
 814  *                                      separated by whitespace
 815  *                      size:           non-zero length of C string in @buf
 816  * Output:
 817  *      On success:     returns zero; NFS service is started
 818  *      On error:       return code is a negative errno value
 819  */
 820 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 821 {
 822         ssize_t rv;
 823         struct net *net = file->f_dentry->d_sb->s_fs_info;
 824
 825         mutex_lock(&nfsd_mutex);
 826         rv = __write_ports(file, buf, size, net);
 827         mutex_unlock(&nfsd_mutex);
 828         return rv;
 829 }
 830
 831
 832 int nfsd_max_blksize;
 833
 834 /**
 835  * write_maxblksize - Set or report the current NFS blksize
 836  *
 837  * Input:
 838  *                      buf:            ignored
 839  *                      size:           zero
 840  *
 841  * OR
 842  *
 843  * Input:
 844  *                      buf:            C string containing an unsigned
 845  *                                      integer value representing the new
 846  *                                      NFS blksize
 847  *                      size:           non-zero length of C string in @buf
 848  * Output:
 849  *      On success:     passed-in buffer filled with '\n'-terminated C string
 850  *                      containing numeric value of the current NFS blksize
 851  *                      setting;
 852  *                      return code is the size in bytes of the string
 853  *      On error:       return code is zero or a negative errno value
 854  */
 855 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 856 {
 857         char *mesg = buf;
 858         struct net *net = file->f_dentry->d_sb->s_fs_info;
 859         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 860
 861         if (size > 0) {
 862                 int bsize;
 863                 int rv = get_int(&mesg, &bsize);
 864                 if (rv)
 865                         return rv;
 866                 /* force bsize into allowed range and
 867                  * required alignment.
 868                  */
 869                 if (bsize < 1024)
 870                         bsize = 1024;
 871                 if (bsize > NFSSVC_MAXBLKSIZE)
 872                         bsize = NFSSVC_MAXBLKSIZE;
 873                 bsize &= ~(1024-1);
 874                 mutex_lock(&nfsd_mutex);
 875                 if (nn->nfsd_serv) {
 876                         mutex_unlock(&nfsd_mutex);
 877                         return -EBUSY;
 878                 }
 879                 nfsd_max_blksize = bsize;
 880                 mutex_unlock(&nfsd_mutex);
 881         }
 882
 883         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 884                                                         nfsd_max_blksize);
 885 }
 886
 887 #ifdef CONFIG_NFSD_V4
 888 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
 889                                   time_t *time, struct nfsd_net *nn)
 890 {
 891         char *mesg = buf;
 892         int rv, i;
 893
 894         if (size > 0) {
 895                 if (nn->nfsd_serv)
 896                         return -EBUSY;
 897                 rv = get_int(&mesg, &i);
 898                 if (rv)
 899                         return rv;
 900                 /*
 901                  * Some sanity checking.  We don't have a reason for
 902                  * these particular numbers, but problems with the
 903                  * extremes are:
 904                  *      - Too short: the briefest network outage may
 905                  *        cause clients to lose all their locks.  Also,
 906                  *        the frequent polling may be wasteful.
 907                  *      - Too long: do you really want reboot recovery
 908                  *        to take more than an hour?  Or to make other
 909                  *        clients wait an hour before being able to
 910                  *        revoke a dead client's locks?
 911                  */
 912                 if (i < 10 || i > 3600)
 913                         return -EINVAL;
 914                 *time = i;
 915         }
 916
 917         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 918 }
 919
 920 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
 921                                 time_t *time, struct nfsd_net *nn)
 922 {
 923         ssize_t rv;
 924
 925         mutex_lock(&nfsd_mutex);
 926         rv = __nfsd4_write_time(file, buf, size, time, nn);
 927         mutex_unlock(&nfsd_mutex);
 928         return rv;
 929 }
 930
 931 /**
 932  * write_leasetime - Set or report the current NFSv4 lease time
 933  *
 934  * Input:
 935  *                      buf:            ignored
 936  *                      size:           zero
 937  *
 938  * OR
 939  *
 940  * Input:
 941  *                      buf:            C string containing an unsigned
 942  *                                      integer value representing the new
 943  *                                      NFSv4 lease expiry time
 944  *                      size:           non-zero length of C string in @buf
 945  * Output:
 946  *      On success:     passed-in buffer filled with '\n'-terminated C
 947  *                      string containing unsigned integer value of the
 948  *                      current lease expiry time;
 949  *                      return code is the size in bytes of the string
 950  *      On error:       return code is zero or a negative errno value
 951  */
 952 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 953 {
 954         struct net *net = file->f_dentry->d_sb->s_fs_info;
 955         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 956         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
 957 }
 958
 959 /**
 960  * write_gracetime - Set or report current NFSv4 grace period time
 961  *
 962  * As above, but sets the time of the NFSv4 grace period.
 963  *
 964  * Note this should never be set to less than the *previous*
 965  * lease-period time, but we don't try to enforce this.  (In the common
 966  * case (a new boot), we don't know what the previous lease time was
 967  * anyway.)
 968  */
 969 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
 970 {
 971         struct net *net = file->f_dentry->d_sb->s_fs_info;
 972         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 973         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
 974 }
 975
 976 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
 977                                    struct nfsd_net *nn)
 978 {
 979         char *mesg = buf;
 980         char *recdir;
 981         int len, status;
 982
 983         if (size > 0) {
 984                 if (nn->nfsd_serv)
 985                         return -EBUSY;
 986                 if (size > PATH_MAX || buf[size-1] != '\n')
 987                         return -EINVAL;
 988                 buf[size-1] = 0;
 989
 990                 recdir = mesg;
 991                 len = qword_get(&mesg, recdir, size);
 992                 if (len <= 0)
 993                         return -EINVAL;
 994
 995                 status = nfs4_reset_recoverydir(recdir);
 996                 if (status)
 997                         return status;
 998         }
 999
1000         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1001                                                         nfs4_recoverydir());
1002 }
1003
1004 /**
1005  * write_recoverydir - Set or report the pathname of the recovery directory
1006  *
1007  * Input:
1008  *                      buf:            ignored
1009  *                      size:           zero
1010  *
1011  * OR
1012  *
1013  * Input:
1014  *                      buf:            C string containing the pathname
1015  *                                      of the directory on a local file
1016  *                                      system containing permanent NFSv4
1017  *                                      recovery data
1018  *                      size:           non-zero length of C string in @buf
1019  * Output:
1020  *      On success:     passed-in buffer filled with '\n'-terminated C string
1021  *                      containing the current recovery pathname setting;
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_recoverydir(struct file *file, char *buf, size_t size)
1026 {
1027         ssize_t rv;
1028         struct net *net = file->f_dentry->d_sb->s_fs_info;
1029         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1030
1031         mutex_lock(&nfsd_mutex);
1032         rv = __write_recoverydir(file, buf, size, nn);
1033         mutex_unlock(&nfsd_mutex);
1034         return rv;
1035 }
1036
1037 #endif
1038
1039 /*----------------------------------------------------------------------------*/
1040 /*
1041  *      populating the filesystem.
1042  */
1043
1044 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1045 {
1046         static struct tree_descr nfsd_files[] = {
1047                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1048                 [NFSD_Export_features] = {"export_features",
1049                                         &export_features_operations, S_IRUGO},
1050                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1051                                         &transaction_ops, S_IWUSR|S_IRUSR},
1052                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1053                                         &transaction_ops, S_IWUSR|S_IRUSR},
1054                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1055                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1056                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1057                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1058                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1059                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1060                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1061                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1062 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1063                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1064 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1065 #ifdef CONFIG_NFSD_V4
1066                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1067                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1068                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1069 #endif
1070                 /* last one */ {""}
1071         };
1072         struct net *net = data;
1073         int ret;
1074
1075         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1076         if (ret)
1077                 return ret;
1078         sb->s_fs_info = get_net(net);
1079         return 0;
1080 }
1081
1082 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1083         int flags, const char *dev_name, void *data)
1084 {
1085         return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1086 }
1087
1088 static void nfsd_umount(struct super_block *sb)
1089 {
1090         struct net *net = sb->s_fs_info;
1091
1092         kill_litter_super(sb);
1093         put_net(net);
1094 }
1095
1096 static struct file_system_type nfsd_fs_type = {
1097         .owner          = THIS_MODULE,
1098         .name           = "nfsd",
1099         .mount          = nfsd_mount,
1100         .kill_sb        = nfsd_umount,
1101 };
1102 MODULE_ALIAS_FS("nfsd");
1103
1104 #ifdef CONFIG_PROC_FS
1105 static int create_proc_exports_entry(void)
1106 {
1107         struct proc_dir_entry *entry;
1108
1109         entry = proc_mkdir("fs/nfs", NULL);
1110         if (!entry)
1111                 return -ENOMEM;
1112         entry = proc_create("exports", 0, entry,
1113                                  &exports_proc_operations);
1114         if (!entry) {
1115                 remove_proc_entry("fs/nfs", NULL);
1116                 return -ENOMEM;
1117         }
1118         return 0;
1119 }
1120 #else /* CONFIG_PROC_FS */
1121 static int create_proc_exports_entry(void)
1122 {
1123         return 0;
1124 }
1125 #endif
1126
1127 int nfsd_net_id;
1128
1129 static __net_init int nfsd_init_net(struct net *net)
1130 {
1131         int retval;
1132         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1133
1134         retval = nfsd_export_init(net);
1135         if (retval)
1136                 goto out_export_error;
1137         retval = nfsd_idmap_init(net);
1138         if (retval)
1139                 goto out_idmap_error;
1140         nn->nfsd4_lease = 90;   /* default lease time */
1141         nn->nfsd4_grace = 90;
1142         return 0;
1143
1144 out_idmap_error:
1145         nfsd_export_shutdown(net);
1146 out_export_error:
1147         return retval;
1148 }
1149
1150 static __net_exit void nfsd_exit_net(struct net *net)
1151 {
1152         nfsd_idmap_shutdown(net);
1153         nfsd_export_shutdown(net);
1154 }
1155
1156 static struct pernet_operations nfsd_net_ops = {
1157         .init = nfsd_init_net,
1158         .exit = nfsd_exit_net,
1159         .id   = &nfsd_net_id,
1160         .size = sizeof(struct nfsd_net),
1161 };
1162
1163 static int __init init_nfsd(void)
1164 {
1165         int retval;
1166         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1167
1168         retval = register_cld_notifier();
1169         if (retval)
1170                 return retval;
1171         retval = register_pernet_subsys(&nfsd_net_ops);
1172         if (retval < 0)
1173                 goto out_unregister_notifier;
1174         retval = nfsd4_init_slabs();
1175         if (retval)
1176                 goto out_unregister_pernet;
1177         nfs4_state_init();
1178         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1179         if (retval)
1180                 goto out_free_slabs;
1181         nfsd_stat_init();       /* Statistics */
1182         retval = nfsd_reply_cache_init();
1183         if (retval)
1184                 goto out_free_stat;
1185         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1186         retval = create_proc_exports_entry();
1187         if (retval)
1188                 goto out_free_lockd;
1189         retval = register_filesystem(&nfsd_fs_type);
1190         if (retval)
1191                 goto out_free_all;
1192         return 0;
1193 out_free_all:
1194         remove_proc_entry("fs/nfs/exports", NULL);
1195         remove_proc_entry("fs/nfs", NULL);
1196 out_free_lockd:
1197         nfsd_lockd_shutdown();
1198         nfsd_reply_cache_shutdown();
1199 out_free_stat:
1200         nfsd_stat_shutdown();
1201         nfsd_fault_inject_cleanup();
1202 out_free_slabs:
1203         nfsd4_free_slabs();
1204 out_unregister_pernet:
1205         unregister_pernet_subsys(&nfsd_net_ops);
1206 out_unregister_notifier:
1207         unregister_cld_notifier();
1208         return retval;
1209 }
1210
1211 static void __exit exit_nfsd(void)
1212 {
1213         nfsd_reply_cache_shutdown();
1214         remove_proc_entry("fs/nfs/exports", NULL);
1215         remove_proc_entry("fs/nfs", NULL);
1216         nfsd_stat_shutdown();
1217         nfsd_lockd_shutdown();
1218         nfsd4_free_slabs();
1219         nfsd_fault_inject_cleanup();
1220         unregister_filesystem(&nfsd_fs_type);
1221         unregister_pernet_subsys(&nfsd_net_ops);
1222         unregister_cld_notifier();
1223 }
1224
1225 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1226 MODULE_LICENSE("GPL");
1227 module_init(init_nfsd)
1228 module_exit(exit_nfsd)