linux/fs/nfsd/nfsctl.c
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   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 */
  28enum {
  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 */
  57static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  58static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  59static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  60static ssize_t write_threads(struct file *file, char *buf, size_t size);
  61static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  62static ssize_t write_versions(struct file *file, char *buf, size_t size);
  63static ssize_t write_ports(struct file *file, char *buf, size_t size);
  64static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  65#ifdef CONFIG_NFSD_V4
  66static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  67static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  68static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  69#endif
  70
  71static 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
  87static 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
 108static 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
 122static 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
 129static 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
 144static int exports_proc_open(struct inode *inode, struct file *file)
 145{
 146        return exports_net_open(current->nsproxy->net_ns, file);
 147}
 148
 149static 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
 157static 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
 162static 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
 170static 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
 176static int export_features_open(struct inode *inode, struct file *file)
 177{
 178        return single_open(file, export_features_show, NULL);
 179}
 180
 181static 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)
 189static int supported_enctypes_show(struct seq_file *m, void *v)
 190{
 191        seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 192        return 0;
 193}
 194
 195static int supported_enctypes_open(struct inode *inode, struct file *file)
 196{
 197        return single_open(file, supported_enctypes_show, NULL);
 198}
 199
 200static 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
 208static 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
 216static 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 */
 243static 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 */
 282static 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 */
 339static 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 */
 423static 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 */
 467static 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;
 527out_free:
 528        kfree(nthreads);
 529        mutex_unlock(&nfsd_mutex);
 530        return rv;
 531}
 532
 533static 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 */
 664static 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 */
 678static 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 */
 692static 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 */
 721static 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;
 751out_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        }
 757out_err:
 758        nfsd_destroy(net);
 759        return err;
 760}
 761
 762static 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 */
 820static 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
 832int 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 */
 855static 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
 888static 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
 920static 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 */
 952static 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 */
 969static 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
 976static 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 */
1025static 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
1044static 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
1082static 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
1088static 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
1096static struct file_system_type nfsd_fs_type = {
1097        .owner          = THIS_MODULE,
1098        .name           = "nfsd",
1099        .mount          = nfsd_mount,
1100        .kill_sb        = nfsd_umount,
1101};
1102MODULE_ALIAS_FS("nfsd");
1103
1104#ifdef CONFIG_PROC_FS
1105static 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 */
1121static int create_proc_exports_entry(void)
1122{
1123        return 0;
1124}
1125#endif
1126
1127int nfsd_net_id;
1128
1129static __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
1144out_idmap_error:
1145        nfsd_export_shutdown(net);
1146out_export_error:
1147        return retval;
1148}
1149
1150static __net_exit void nfsd_exit_net(struct net *net)
1151{
1152        nfsd_idmap_shutdown(net);
1153        nfsd_export_shutdown(net);
1154}
1155
1156static 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
1163static 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;
1193out_free_all:
1194        remove_proc_entry("fs/nfs/exports", NULL);
1195        remove_proc_entry("fs/nfs", NULL);
1196out_free_lockd:
1197        nfsd_lockd_shutdown();
1198        nfsd_reply_cache_shutdown();
1199out_free_stat:
1200        nfsd_stat_shutdown();
1201        nfsd_fault_inject_cleanup();
1202out_free_slabs:
1203        nfsd4_free_slabs();
1204out_unregister_pernet:
1205        unregister_pernet_subsys(&nfsd_net_ops);
1206out_unregister_notifier:
1207        unregister_cld_notifier();
1208        return retval;
1209}
1210
1211static 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
1225MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1226MODULE_LICENSE("GPL");
1227module_init(init_nfsd)
1228module_exit(exit_nfsd)
1229
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