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/clnt.h>
  14#include <linux/sunrpc/gss_api.h>
  15#include <linux/sunrpc/gss_krb5_enctypes.h>
  16#include <linux/sunrpc/rpc_pipe_fs.h>
  17#include <linux/module.h>
  18
  19#include "idmap.h"
  20#include "nfsd.h"
  21#include "cache.h"
  22#include "fault_inject.h"
  23#include "netns.h"
  24
  25/*
  26 *      We have a single directory with several nodes in it.
  27 */
  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_Versions,
  39        NFSD_Ports,
  40        NFSD_MaxBlkSize,
  41        NFSD_SupportedEnctypes,
  42        /*
  43         * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  44         * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  45         */
  46#ifdef CONFIG_NFSD_V4
  47        NFSD_Leasetime,
  48        NFSD_Gracetime,
  49        NFSD_RecoveryDir,
  50#endif
  51};
  52
  53/*
  54 * write() for these nodes.
  55 */
  56static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  57static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  58static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  59static ssize_t write_threads(struct file *file, char *buf, size_t size);
  60static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  61static ssize_t write_versions(struct file *file, char *buf, size_t size);
  62static ssize_t write_ports(struct file *file, char *buf, size_t size);
  63static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  64#ifdef CONFIG_NFSD_V4
  65static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  66static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  67static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  68#endif
  69
  70static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  71        [NFSD_Fh] = write_filehandle,
  72        [NFSD_FO_UnlockIP] = write_unlock_ip,
  73        [NFSD_FO_UnlockFS] = write_unlock_fs,
  74        [NFSD_Threads] = write_threads,
  75        [NFSD_Pool_Threads] = write_pool_threads,
  76        [NFSD_Versions] = write_versions,
  77        [NFSD_Ports] = write_ports,
  78        [NFSD_MaxBlkSize] = write_maxblksize,
  79#ifdef CONFIG_NFSD_V4
  80        [NFSD_Leasetime] = write_leasetime,
  81        [NFSD_Gracetime] = write_gracetime,
  82        [NFSD_RecoveryDir] = write_recoverydir,
  83#endif
  84};
  85
  86static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  87{
  88        ino_t ino =  file->f_path.dentry->d_inode->i_ino;
  89        char *data;
  90        ssize_t rv;
  91
  92        if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
  93                return -EINVAL;
  94
  95        data = simple_transaction_get(file, buf, size);
  96        if (IS_ERR(data))
  97                return PTR_ERR(data);
  98
  99        rv =  write_op[ino](file, data, size);
 100        if (rv >= 0) {
 101                simple_transaction_set(file, rv);
 102                rv = size;
 103        }
 104        return rv;
 105}
 106
 107static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 108{
 109        if (! file->private_data) {
 110                /* An attempt to read a transaction file without writing
 111                 * causes a 0-byte write so that the file can return
 112                 * state information
 113                 */
 114                ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 115                if (rv < 0)
 116                        return rv;
 117        }
 118        return simple_transaction_read(file, buf, size, pos);
 119}
 120
 121static const struct file_operations transaction_ops = {
 122        .write          = nfsctl_transaction_write,
 123        .read           = nfsctl_transaction_read,
 124        .release        = simple_transaction_release,
 125        .llseek         = default_llseek,
 126};
 127
 128static int exports_open(struct inode *inode, struct file *file)
 129{
 130        int err;
 131        struct seq_file *seq;
 132        struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
 133
 134        err = seq_open(file, &nfs_exports_op);
 135        if (err)
 136                return err;
 137
 138        seq = file->private_data;
 139        seq->private = nn->svc_export_cache;
 140        return 0;
 141}
 142
 143static const struct file_operations exports_operations = {
 144        .open           = exports_open,
 145        .read           = seq_read,
 146        .llseek         = seq_lseek,
 147        .release        = seq_release,
 148        .owner          = THIS_MODULE,
 149};
 150
 151static int export_features_show(struct seq_file *m, void *v)
 152{
 153        seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 154        return 0;
 155}
 156
 157static int export_features_open(struct inode *inode, struct file *file)
 158{
 159        return single_open(file, export_features_show, NULL);
 160}
 161
 162static struct file_operations export_features_operations = {
 163        .open           = export_features_open,
 164        .read           = seq_read,
 165        .llseek         = seq_lseek,
 166        .release        = single_release,
 167};
 168
 169#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 170static int supported_enctypes_show(struct seq_file *m, void *v)
 171{
 172        seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 173        return 0;
 174}
 175
 176static int supported_enctypes_open(struct inode *inode, struct file *file)
 177{
 178        return single_open(file, supported_enctypes_show, NULL);
 179}
 180
 181static struct file_operations supported_enctypes_ops = {
 182        .open           = supported_enctypes_open,
 183        .read           = seq_read,
 184        .llseek         = seq_lseek,
 185        .release        = single_release,
 186};
 187#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 188
 189extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
 190extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 191
 192static const struct file_operations pool_stats_operations = {
 193        .open           = nfsd_pool_stats_open,
 194        .read           = seq_read,
 195        .llseek         = seq_lseek,
 196        .release        = nfsd_pool_stats_release,
 197        .owner          = THIS_MODULE,
 198};
 199
 200/*----------------------------------------------------------------------------*/
 201/*
 202 * payload - write methods
 203 */
 204
 205
 206/**
 207 * write_unlock_ip - Release all locks used by a client
 208 *
 209 * Experimental.
 210 *
 211 * Input:
 212 *                      buf:    '\n'-terminated C string containing a
 213 *                              presentation format IP address
 214 *                      size:   length of C string in @buf
 215 * Output:
 216 *      On success:     returns zero if all specified locks were released;
 217 *                      returns one if one or more locks were not released
 218 *      On error:       return code is negative errno value
 219 */
 220static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 221{
 222        struct sockaddr_storage address;
 223        struct sockaddr *sap = (struct sockaddr *)&address;
 224        size_t salen = sizeof(address);
 225        char *fo_path;
 226
 227        /* sanity check */
 228        if (size == 0)
 229                return -EINVAL;
 230
 231        if (buf[size-1] != '\n')
 232                return -EINVAL;
 233
 234        fo_path = buf;
 235        if (qword_get(&buf, fo_path, size) < 0)
 236                return -EINVAL;
 237
 238        if (rpc_pton(&init_net, fo_path, size, sap, salen) == 0)
 239                return -EINVAL;
 240
 241        return nlmsvc_unlock_all_by_ip(sap);
 242}
 243
 244/**
 245 * write_unlock_fs - Release all locks on a local file system
 246 *
 247 * Experimental.
 248 *
 249 * Input:
 250 *                      buf:    '\n'-terminated C string containing the
 251 *                              absolute pathname of a local file system
 252 *                      size:   length of C string in @buf
 253 * Output:
 254 *      On success:     returns zero if all specified locks were released;
 255 *                      returns one if one or more locks were not released
 256 *      On error:       return code is negative errno value
 257 */
 258static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 259{
 260        struct path path;
 261        char *fo_path;
 262        int error;
 263
 264        /* sanity check */
 265        if (size == 0)
 266                return -EINVAL;
 267
 268        if (buf[size-1] != '\n')
 269                return -EINVAL;
 270
 271        fo_path = buf;
 272        if (qword_get(&buf, fo_path, size) < 0)
 273                return -EINVAL;
 274
 275        error = kern_path(fo_path, 0, &path);
 276        if (error)
 277                return error;
 278
 279        /*
 280         * XXX: Needs better sanity checking.  Otherwise we could end up
 281         * releasing locks on the wrong file system.
 282         *
 283         * For example:
 284         * 1.  Does the path refer to a directory?
 285         * 2.  Is that directory a mount point, or
 286         * 3.  Is that directory the root of an exported file system?
 287         */
 288        error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 289
 290        path_put(&path);
 291        return error;
 292}
 293
 294/**
 295 * write_filehandle - Get a variable-length NFS file handle by path
 296 *
 297 * On input, the buffer contains a '\n'-terminated C string comprised of
 298 * three alphanumeric words separated by whitespace.  The string may
 299 * contain escape sequences.
 300 *
 301 * Input:
 302 *                      buf:
 303 *                              domain:         client domain name
 304 *                              path:           export pathname
 305 *                              maxsize:        numeric maximum size of
 306 *                                              @buf
 307 *                      size:   length of C string in @buf
 308 * Output:
 309 *      On success:     passed-in buffer filled with '\n'-terminated C
 310 *                      string containing a ASCII hex text version
 311 *                      of the NFS file handle;
 312 *                      return code is the size in bytes of the string
 313 *      On error:       return code is negative errno value
 314 */
 315static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 316{
 317        char *dname, *path;
 318        int uninitialized_var(maxsize);
 319        char *mesg = buf;
 320        int len;
 321        struct auth_domain *dom;
 322        struct knfsd_fh fh;
 323
 324        if (size == 0)
 325                return -EINVAL;
 326
 327        if (buf[size-1] != '\n')
 328                return -EINVAL;
 329        buf[size-1] = 0;
 330
 331        dname = mesg;
 332        len = qword_get(&mesg, dname, size);
 333        if (len <= 0)
 334                return -EINVAL;
 335        
 336        path = dname+len+1;
 337        len = qword_get(&mesg, path, size);
 338        if (len <= 0)
 339                return -EINVAL;
 340
 341        len = get_int(&mesg, &maxsize);
 342        if (len)
 343                return len;
 344
 345        if (maxsize < NFS_FHSIZE)
 346                return -EINVAL;
 347        if (maxsize > NFS3_FHSIZE)
 348                maxsize = NFS3_FHSIZE;
 349
 350        if (qword_get(&mesg, mesg, size)>0)
 351                return -EINVAL;
 352
 353        /* we have all the words, they are in buf.. */
 354        dom = unix_domain_find(dname);
 355        if (!dom)
 356                return -ENOMEM;
 357
 358        len = exp_rootfh(&init_net, dom, path, &fh,  maxsize);
 359        auth_domain_put(dom);
 360        if (len)
 361                return len;
 362        
 363        mesg = buf;
 364        len = SIMPLE_TRANSACTION_LIMIT;
 365        qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 366        mesg[-1] = '\n';
 367        return mesg - buf;      
 368}
 369
 370/**
 371 * write_threads - Start NFSD, or report the current number of running threads
 372 *
 373 * Input:
 374 *                      buf:            ignored
 375 *                      size:           zero
 376 * Output:
 377 *      On success:     passed-in buffer filled with '\n'-terminated C
 378 *                      string numeric value representing the number of
 379 *                      running NFSD threads;
 380 *                      return code is the size in bytes of the string
 381 *      On error:       return code is zero
 382 *
 383 * OR
 384 *
 385 * Input:
 386 *                      buf:            C string containing an unsigned
 387 *                                      integer value representing the
 388 *                                      number of NFSD threads to start
 389 *                      size:           non-zero length of C string in @buf
 390 * Output:
 391 *      On success:     NFS service is started;
 392 *                      passed-in buffer filled with '\n'-terminated C
 393 *                      string numeric value representing the number of
 394 *                      running NFSD threads;
 395 *                      return code is the size in bytes of the string
 396 *      On error:       return code is zero or a negative errno value
 397 */
 398static ssize_t write_threads(struct file *file, char *buf, size_t size)
 399{
 400        char *mesg = buf;
 401        int rv;
 402        if (size > 0) {
 403                int newthreads;
 404                rv = get_int(&mesg, &newthreads);
 405                if (rv)
 406                        return rv;
 407                if (newthreads < 0)
 408                        return -EINVAL;
 409                rv = nfsd_svc(NFS_PORT, newthreads);
 410                if (rv < 0)
 411                        return rv;
 412        } else
 413                rv = nfsd_nrthreads();
 414
 415        return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 416}
 417
 418/**
 419 * write_pool_threads - Set or report the current number of threads per pool
 420 *
 421 * Input:
 422 *                      buf:            ignored
 423 *                      size:           zero
 424 *
 425 * OR
 426 *
 427 * Input:
 428 *                      buf:            C string containing whitespace-
 429 *                                      separated unsigned integer values
 430 *                                      representing the number of NFSD
 431 *                                      threads to start in each pool
 432 *                      size:           non-zero length of C string in @buf
 433 * Output:
 434 *      On success:     passed-in buffer filled with '\n'-terminated C
 435 *                      string containing integer values representing the
 436 *                      number of NFSD threads in each pool;
 437 *                      return code is the size in bytes of the string
 438 *      On error:       return code is zero or a negative errno value
 439 */
 440static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 441{
 442        /* if size > 0, look for an array of number of threads per node
 443         * and apply them  then write out number of threads per node as reply
 444         */
 445        char *mesg = buf;
 446        int i;
 447        int rv;
 448        int len;
 449        int npools;
 450        int *nthreads;
 451
 452        mutex_lock(&nfsd_mutex);
 453        npools = nfsd_nrpools();
 454        if (npools == 0) {
 455                /*
 456                 * NFS is shut down.  The admin can start it by
 457                 * writing to the threads file but NOT the pool_threads
 458                 * file, sorry.  Report zero threads.
 459                 */
 460                mutex_unlock(&nfsd_mutex);
 461                strcpy(buf, "0\n");
 462                return strlen(buf);
 463        }
 464
 465        nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 466        rv = -ENOMEM;
 467        if (nthreads == NULL)
 468                goto out_free;
 469
 470        if (size > 0) {
 471                for (i = 0; i < npools; i++) {
 472                        rv = get_int(&mesg, &nthreads[i]);
 473                        if (rv == -ENOENT)
 474                                break;          /* fewer numbers than pools */
 475                        if (rv)
 476                                goto out_free;  /* syntax error */
 477                        rv = -EINVAL;
 478                        if (nthreads[i] < 0)
 479                                goto out_free;
 480                }
 481                rv = nfsd_set_nrthreads(i, nthreads);
 482                if (rv)
 483                        goto out_free;
 484        }
 485
 486        rv = nfsd_get_nrthreads(npools, nthreads);
 487        if (rv)
 488                goto out_free;
 489
 490        mesg = buf;
 491        size = SIMPLE_TRANSACTION_LIMIT;
 492        for (i = 0; i < npools && size > 0; i++) {
 493                snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 494                len = strlen(mesg);
 495                size -= len;
 496                mesg += len;
 497        }
 498        rv = mesg - buf;
 499out_free:
 500        kfree(nthreads);
 501        mutex_unlock(&nfsd_mutex);
 502        return rv;
 503}
 504
 505static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 506{
 507        char *mesg = buf;
 508        char *vers, *minorp, sign;
 509        int len, num, remaining;
 510        unsigned minor;
 511        ssize_t tlen = 0;
 512        char *sep;
 513
 514        if (size>0) {
 515                if (nfsd_serv)
 516                        /* Cannot change versions without updating
 517                         * nfsd_serv->sv_xdrsize, and reallocing
 518                         * rq_argp and rq_resp
 519                         */
 520                        return -EBUSY;
 521                if (buf[size-1] != '\n')
 522                        return -EINVAL;
 523                buf[size-1] = 0;
 524
 525                vers = mesg;
 526                len = qword_get(&mesg, vers, size);
 527                if (len <= 0) return -EINVAL;
 528                do {
 529                        sign = *vers;
 530                        if (sign == '+' || sign == '-')
 531                                num = simple_strtol((vers+1), &minorp, 0);
 532                        else
 533                                num = simple_strtol(vers, &minorp, 0);
 534                        if (*minorp == '.') {
 535                                if (num < 4)
 536                                        return -EINVAL;
 537                                minor = simple_strtoul(minorp+1, NULL, 0);
 538                                if (minor == 0)
 539                                        return -EINVAL;
 540                                if (nfsd_minorversion(minor, sign == '-' ?
 541                                                     NFSD_CLEAR : NFSD_SET) < 0)
 542                                        return -EINVAL;
 543                                goto next;
 544                        }
 545                        switch(num) {
 546                        case 2:
 547                        case 3:
 548                        case 4:
 549                                nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 550                                break;
 551                        default:
 552                                return -EINVAL;
 553                        }
 554                next:
 555                        vers += len + 1;
 556                } while ((len = qword_get(&mesg, vers, size)) > 0);
 557                /* If all get turned off, turn them back on, as
 558                 * having no versions is BAD
 559                 */
 560                nfsd_reset_versions();
 561        }
 562
 563        /* Now write current state into reply buffer */
 564        len = 0;
 565        sep = "";
 566        remaining = SIMPLE_TRANSACTION_LIMIT;
 567        for (num=2 ; num <= 4 ; num++)
 568                if (nfsd_vers(num, NFSD_AVAIL)) {
 569                        len = snprintf(buf, remaining, "%s%c%d", sep,
 570                                       nfsd_vers(num, NFSD_TEST)?'+':'-',
 571                                       num);
 572                        sep = " ";
 573
 574                        if (len > remaining)
 575                                break;
 576                        remaining -= len;
 577                        buf += len;
 578                        tlen += len;
 579                }
 580        if (nfsd_vers(4, NFSD_AVAIL))
 581                for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 582                     minor++) {
 583                        len = snprintf(buf, remaining, " %c4.%u",
 584                                        (nfsd_vers(4, NFSD_TEST) &&
 585                                         nfsd_minorversion(minor, NFSD_TEST)) ?
 586                                                '+' : '-',
 587                                        minor);
 588
 589                        if (len > remaining)
 590                                break;
 591                        remaining -= len;
 592                        buf += len;
 593                        tlen += len;
 594                }
 595
 596        len = snprintf(buf, remaining, "\n");
 597        if (len > remaining)
 598                return -EINVAL;
 599        return tlen + len;
 600}
 601
 602/**
 603 * write_versions - Set or report the available NFS protocol versions
 604 *
 605 * Input:
 606 *                      buf:            ignored
 607 *                      size:           zero
 608 * Output:
 609 *      On success:     passed-in buffer filled with '\n'-terminated C
 610 *                      string containing positive or negative integer
 611 *                      values representing the current status of each
 612 *                      protocol version;
 613 *                      return code is the size in bytes of the string
 614 *      On error:       return code is zero or a negative errno value
 615 *
 616 * OR
 617 *
 618 * Input:
 619 *                      buf:            C string containing whitespace-
 620 *                                      separated positive or negative
 621 *                                      integer values representing NFS
 622 *                                      protocol versions to enable ("+n")
 623 *                                      or disable ("-n")
 624 *                      size:           non-zero length of C string in @buf
 625 * Output:
 626 *      On success:     status of zero or more protocol versions has
 627 *                      been updated; passed-in buffer filled with
 628 *                      '\n'-terminated C string containing positive
 629 *                      or negative integer values representing the
 630 *                      current status of each protocol version;
 631 *                      return code is the size in bytes of the string
 632 *      On error:       return code is zero or a negative errno value
 633 */
 634static ssize_t write_versions(struct file *file, char *buf, size_t size)
 635{
 636        ssize_t rv;
 637
 638        mutex_lock(&nfsd_mutex);
 639        rv = __write_versions(file, buf, size);
 640        mutex_unlock(&nfsd_mutex);
 641        return rv;
 642}
 643
 644/*
 645 * Zero-length write.  Return a list of NFSD's current listener
 646 * transports.
 647 */
 648static ssize_t __write_ports_names(char *buf)
 649{
 650        if (nfsd_serv == NULL)
 651                return 0;
 652        return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 653}
 654
 655/*
 656 * A single 'fd' number was written, in which case it must be for
 657 * a socket of a supported family/protocol, and we use it as an
 658 * nfsd listener.
 659 */
 660static ssize_t __write_ports_addfd(char *buf)
 661{
 662        char *mesg = buf;
 663        int fd, err;
 664        struct net *net = &init_net;
 665
 666        err = get_int(&mesg, &fd);
 667        if (err != 0 || fd < 0)
 668                return -EINVAL;
 669
 670        err = nfsd_create_serv();
 671        if (err != 0)
 672                return err;
 673
 674        err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 675        if (err < 0) {
 676                nfsd_destroy(net);
 677                return err;
 678        }
 679
 680        /* Decrease the count, but don't shut down the service */
 681        nfsd_serv->sv_nrthreads--;
 682        return err;
 683}
 684
 685/*
 686 * A '-' followed by the 'name' of a socket means we close the socket.
 687 */
 688static ssize_t __write_ports_delfd(char *buf)
 689{
 690        char *toclose;
 691        int len = 0;
 692
 693        toclose = kstrdup(buf + 1, GFP_KERNEL);
 694        if (toclose == NULL)
 695                return -ENOMEM;
 696
 697        if (nfsd_serv != NULL)
 698                len = svc_sock_names(nfsd_serv, buf,
 699                                        SIMPLE_TRANSACTION_LIMIT, toclose);
 700        kfree(toclose);
 701        return len;
 702}
 703
 704/*
 705 * A transport listener is added by writing it's transport name and
 706 * a port number.
 707 */
 708static ssize_t __write_ports_addxprt(char *buf)
 709{
 710        char transport[16];
 711        struct svc_xprt *xprt;
 712        int port, err;
 713        struct net *net = &init_net;
 714
 715        if (sscanf(buf, "%15s %4u", transport, &port) != 2)
 716                return -EINVAL;
 717
 718        if (port < 1 || port > USHRT_MAX)
 719                return -EINVAL;
 720
 721        err = nfsd_create_serv();
 722        if (err != 0)
 723                return err;
 724
 725        err = svc_create_xprt(nfsd_serv, transport, net,
 726                                PF_INET, port, SVC_SOCK_ANONYMOUS);
 727        if (err < 0)
 728                goto out_err;
 729
 730        err = svc_create_xprt(nfsd_serv, transport, net,
 731                                PF_INET6, port, SVC_SOCK_ANONYMOUS);
 732        if (err < 0 && err != -EAFNOSUPPORT)
 733                goto out_close;
 734
 735        /* Decrease the count, but don't shut down the service */
 736        nfsd_serv->sv_nrthreads--;
 737        return 0;
 738out_close:
 739        xprt = svc_find_xprt(nfsd_serv, transport, net, PF_INET, port);
 740        if (xprt != NULL) {
 741                svc_close_xprt(xprt);
 742                svc_xprt_put(xprt);
 743        }
 744out_err:
 745        nfsd_destroy(net);
 746        return err;
 747}
 748
 749/*
 750 * A transport listener is removed by writing a "-", it's transport
 751 * name, and it's port number.
 752 */
 753static ssize_t __write_ports_delxprt(char *buf)
 754{
 755        struct svc_xprt *xprt;
 756        char transport[16];
 757        int port;
 758
 759        if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
 760                return -EINVAL;
 761
 762        if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
 763                return -EINVAL;
 764
 765        xprt = svc_find_xprt(nfsd_serv, transport, &init_net, AF_UNSPEC, port);
 766        if (xprt == NULL)
 767                return -ENOTCONN;
 768
 769        svc_close_xprt(xprt);
 770        svc_xprt_put(xprt);
 771        return 0;
 772}
 773
 774static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 775{
 776        if (size == 0)
 777                return __write_ports_names(buf);
 778
 779        if (isdigit(buf[0]))
 780                return __write_ports_addfd(buf);
 781
 782        if (buf[0] == '-' && isdigit(buf[1]))
 783                return __write_ports_delfd(buf);
 784
 785        if (isalpha(buf[0]))
 786                return __write_ports_addxprt(buf);
 787
 788        if (buf[0] == '-' && isalpha(buf[1]))
 789                return __write_ports_delxprt(buf);
 790
 791        return -EINVAL;
 792}
 793
 794/**
 795 * write_ports - Pass a socket file descriptor or transport name to listen on
 796 *
 797 * Input:
 798 *                      buf:            ignored
 799 *                      size:           zero
 800 * Output:
 801 *      On success:     passed-in buffer filled with a '\n'-terminated C
 802 *                      string containing a whitespace-separated list of
 803 *                      named NFSD listeners;
 804 *                      return code is the size in bytes of the string
 805 *      On error:       return code is zero or a negative errno value
 806 *
 807 * OR
 808 *
 809 * Input:
 810 *                      buf:            C string containing an unsigned
 811 *                                      integer value representing a bound
 812 *                                      but unconnected socket that is to be
 813 *                                      used as an NFSD listener; listen(3)
 814 *                                      must be called for a SOCK_STREAM
 815 *                                      socket, otherwise it is ignored
 816 *                      size:           non-zero length of C string in @buf
 817 * Output:
 818 *      On success:     NFS service is started;
 819 *                      passed-in buffer filled with a '\n'-terminated C
 820 *                      string containing a unique alphanumeric name of
 821 *                      the listener;
 822 *                      return code is the size in bytes of the string
 823 *      On error:       return code is a negative errno value
 824 *
 825 * OR
 826 *
 827 * Input:
 828 *                      buf:            C string containing a "-" followed
 829 *                                      by an integer value representing a
 830 *                                      previously passed in socket file
 831 *                                      descriptor
 832 *                      size:           non-zero length of C string in @buf
 833 * Output:
 834 *      On success:     NFS service no longer listens on that socket;
 835 *                      passed-in buffer filled with a '\n'-terminated C
 836 *                      string containing a unique name of the listener;
 837 *                      return code is the size in bytes of the string
 838 *      On error:       return code is a negative errno value
 839 *
 840 * OR
 841 *
 842 * Input:
 843 *                      buf:            C string containing a transport
 844 *                                      name and an unsigned integer value
 845 *                                      representing the port to listen on,
 846 *                                      separated by whitespace
 847 *                      size:           non-zero length of C string in @buf
 848 * Output:
 849 *      On success:     returns zero; NFS service is started
 850 *      On error:       return code is a negative errno value
 851 *
 852 * OR
 853 *
 854 * Input:
 855 *                      buf:            C string containing a "-" followed
 856 *                                      by a transport name and an unsigned
 857 *                                      integer value representing the port
 858 *                                      to listen on, separated by whitespace
 859 *                      size:           non-zero length of C string in @buf
 860 * Output:
 861 *      On success:     returns zero; NFS service no longer listens
 862 *                      on that transport
 863 *      On error:       return code is a negative errno value
 864 */
 865static ssize_t write_ports(struct file *file, char *buf, size_t size)
 866{
 867        ssize_t rv;
 868
 869        mutex_lock(&nfsd_mutex);
 870        rv = __write_ports(file, buf, size);
 871        mutex_unlock(&nfsd_mutex);
 872        return rv;
 873}
 874
 875
 876int nfsd_max_blksize;
 877
 878/**
 879 * write_maxblksize - Set or report the current NFS blksize
 880 *
 881 * Input:
 882 *                      buf:            ignored
 883 *                      size:           zero
 884 *
 885 * OR
 886 *
 887 * Input:
 888 *                      buf:            C string containing an unsigned
 889 *                                      integer value representing the new
 890 *                                      NFS blksize
 891 *                      size:           non-zero length of C string in @buf
 892 * Output:
 893 *      On success:     passed-in buffer filled with '\n'-terminated C string
 894 *                      containing numeric value of the current NFS blksize
 895 *                      setting;
 896 *                      return code is the size in bytes of the string
 897 *      On error:       return code is zero or a negative errno value
 898 */
 899static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 900{
 901        char *mesg = buf;
 902        if (size > 0) {
 903                int bsize;
 904                int rv = get_int(&mesg, &bsize);
 905                if (rv)
 906                        return rv;
 907                /* force bsize into allowed range and
 908                 * required alignment.
 909                 */
 910                if (bsize < 1024)
 911                        bsize = 1024;
 912                if (bsize > NFSSVC_MAXBLKSIZE)
 913                        bsize = NFSSVC_MAXBLKSIZE;
 914                bsize &= ~(1024-1);
 915                mutex_lock(&nfsd_mutex);
 916                if (nfsd_serv) {
 917                        mutex_unlock(&nfsd_mutex);
 918                        return -EBUSY;
 919                }
 920                nfsd_max_blksize = bsize;
 921                mutex_unlock(&nfsd_mutex);
 922        }
 923
 924        return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 925                                                        nfsd_max_blksize);
 926}
 927
 928#ifdef CONFIG_NFSD_V4
 929static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 930{
 931        char *mesg = buf;
 932        int rv, i;
 933
 934        if (size > 0) {
 935                if (nfsd_serv)
 936                        return -EBUSY;
 937                rv = get_int(&mesg, &i);
 938                if (rv)
 939                        return rv;
 940                /*
 941                 * Some sanity checking.  We don't have a reason for
 942                 * these particular numbers, but problems with the
 943                 * extremes are:
 944                 *      - Too short: the briefest network outage may
 945                 *        cause clients to lose all their locks.  Also,
 946                 *        the frequent polling may be wasteful.
 947                 *      - Too long: do you really want reboot recovery
 948                 *        to take more than an hour?  Or to make other
 949                 *        clients wait an hour before being able to
 950                 *        revoke a dead client's locks?
 951                 */
 952                if (i < 10 || i > 3600)
 953                        return -EINVAL;
 954                *time = i;
 955        }
 956
 957        return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 958}
 959
 960static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
 961{
 962        ssize_t rv;
 963
 964        mutex_lock(&nfsd_mutex);
 965        rv = __nfsd4_write_time(file, buf, size, time);
 966        mutex_unlock(&nfsd_mutex);
 967        return rv;
 968}
 969
 970/**
 971 * write_leasetime - Set or report the current NFSv4 lease time
 972 *
 973 * Input:
 974 *                      buf:            ignored
 975 *                      size:           zero
 976 *
 977 * OR
 978 *
 979 * Input:
 980 *                      buf:            C string containing an unsigned
 981 *                                      integer value representing the new
 982 *                                      NFSv4 lease expiry time
 983 *                      size:           non-zero length of C string in @buf
 984 * Output:
 985 *      On success:     passed-in buffer filled with '\n'-terminated C
 986 *                      string containing unsigned integer value of the
 987 *                      current lease expiry time;
 988 *                      return code is the size in bytes of the string
 989 *      On error:       return code is zero or a negative errno value
 990 */
 991static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 992{
 993        return nfsd4_write_time(file, buf, size, &nfsd4_lease);
 994}
 995
 996/**
 997 * write_gracetime - Set or report current NFSv4 grace period time
 998 *
 999 * As above, but sets the time of the NFSv4 grace period.
1000 *
1001 * Note this should never be set to less than the *previous*
1002 * lease-period time, but we don't try to enforce this.  (In the common
1003 * case (a new boot), we don't know what the previous lease time was
1004 * anyway.)
1005 */
1006static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1007{
1008        return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1009}
1010
1011extern char *nfs4_recoverydir(void);
1012
1013static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1014{
1015        char *mesg = buf;
1016        char *recdir;
1017        int len, status;
1018
1019        if (size > 0) {
1020                if (nfsd_serv)
1021                        return -EBUSY;
1022                if (size > PATH_MAX || buf[size-1] != '\n')
1023                        return -EINVAL;
1024                buf[size-1] = 0;
1025
1026                recdir = mesg;
1027                len = qword_get(&mesg, recdir, size);
1028                if (len <= 0)
1029                        return -EINVAL;
1030
1031                status = nfs4_reset_recoverydir(recdir);
1032                if (status)
1033                        return status;
1034        }
1035
1036        return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1037                                                        nfs4_recoverydir());
1038}
1039
1040/**
1041 * write_recoverydir - Set or report the pathname of the recovery directory
1042 *
1043 * Input:
1044 *                      buf:            ignored
1045 *                      size:           zero
1046 *
1047 * OR
1048 *
1049 * Input:
1050 *                      buf:            C string containing the pathname
1051 *                                      of the directory on a local file
1052 *                                      system containing permanent NFSv4
1053 *                                      recovery data
1054 *                      size:           non-zero length of C string in @buf
1055 * Output:
1056 *      On success:     passed-in buffer filled with '\n'-terminated C string
1057 *                      containing the current recovery pathname setting;
1058 *                      return code is the size in bytes of the string
1059 *      On error:       return code is zero or a negative errno value
1060 */
1061static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1062{
1063        ssize_t rv;
1064
1065        mutex_lock(&nfsd_mutex);
1066        rv = __write_recoverydir(file, buf, size);
1067        mutex_unlock(&nfsd_mutex);
1068        return rv;
1069}
1070
1071#endif
1072
1073/*----------------------------------------------------------------------------*/
1074/*
1075 *      populating the filesystem.
1076 */
1077
1078static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1079{
1080        static struct tree_descr nfsd_files[] = {
1081                [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1082                [NFSD_Export_features] = {"export_features",
1083                                        &export_features_operations, S_IRUGO},
1084                [NFSD_FO_UnlockIP] = {"unlock_ip",
1085                                        &transaction_ops, S_IWUSR|S_IRUSR},
1086                [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1087                                        &transaction_ops, S_IWUSR|S_IRUSR},
1088                [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1089                [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1090                [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1091                [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1092                [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1093                [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1094                [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1095#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1096                [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1097#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1098#ifdef CONFIG_NFSD_V4
1099                [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1100                [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1101                [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1102#endif
1103                /* last one */ {""}
1104        };
1105        return simple_fill_super(sb, 0x6e667364, nfsd_files);
1106}
1107
1108static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1109        int flags, const char *dev_name, void *data)
1110{
1111        return mount_single(fs_type, flags, data, nfsd_fill_super);
1112}
1113
1114static struct file_system_type nfsd_fs_type = {
1115        .owner          = THIS_MODULE,
1116        .name           = "nfsd",
1117        .mount          = nfsd_mount,
1118        .kill_sb        = kill_litter_super,
1119};
1120
1121#ifdef CONFIG_PROC_FS
1122static int create_proc_exports_entry(void)
1123{
1124        struct proc_dir_entry *entry;
1125
1126        entry = proc_mkdir("fs/nfs", NULL);
1127        if (!entry)
1128                return -ENOMEM;
1129        entry = proc_create("exports", 0, entry, &exports_operations);
1130        if (!entry)
1131                return -ENOMEM;
1132        return 0;
1133}
1134#else /* CONFIG_PROC_FS */
1135static int create_proc_exports_entry(void)
1136{
1137        return 0;
1138}
1139#endif
1140
1141int nfsd_net_id;
1142
1143static __net_init int nfsd_init_net(struct net *net)
1144{
1145        int retval;
1146
1147        retval = nfsd_export_init(net);
1148        if (retval)
1149                goto out_export_error;
1150        retval = nfsd_idmap_init(net);
1151        if (retval)
1152                goto out_idmap_error;
1153        return 0;
1154
1155out_idmap_error:
1156        nfsd_export_shutdown(net);
1157out_export_error:
1158        return retval;
1159}
1160
1161static __net_exit void nfsd_exit_net(struct net *net)
1162{
1163        nfsd_idmap_shutdown(net);
1164        nfsd_export_shutdown(net);
1165}
1166
1167static struct pernet_operations nfsd_net_ops = {
1168        .init = nfsd_init_net,
1169        .exit = nfsd_exit_net,
1170        .id   = &nfsd_net_id,
1171        .size = sizeof(struct nfsd_net),
1172};
1173
1174static int __init init_nfsd(void)
1175{
1176        int retval;
1177        printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1178
1179        retval = register_cld_notifier();
1180        if (retval)
1181                return retval;
1182        retval = register_pernet_subsys(&nfsd_net_ops);
1183        if (retval < 0)
1184                goto out_unregister_notifier;
1185        retval = nfsd4_init_slabs();
1186        if (retval)
1187                goto out_unregister_pernet;
1188        nfs4_state_init();
1189        retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1190        if (retval)
1191                goto out_free_slabs;
1192        nfsd_stat_init();       /* Statistics */
1193        retval = nfsd_reply_cache_init();
1194        if (retval)
1195                goto out_free_stat;
1196        nfsd_lockd_init();      /* lockd->nfsd callbacks */
1197        retval = create_proc_exports_entry();
1198        if (retval)
1199                goto out_free_lockd;
1200        retval = register_filesystem(&nfsd_fs_type);
1201        if (retval)
1202                goto out_free_all;
1203        return 0;
1204out_free_all:
1205        remove_proc_entry("fs/nfs/exports", NULL);
1206        remove_proc_entry("fs/nfs", NULL);
1207out_free_lockd:
1208        nfsd_lockd_shutdown();
1209        nfsd_reply_cache_shutdown();
1210out_free_stat:
1211        nfsd_stat_shutdown();
1212        nfsd_fault_inject_cleanup();
1213out_free_slabs:
1214        nfsd4_free_slabs();
1215out_unregister_pernet:
1216        unregister_pernet_subsys(&nfsd_net_ops);
1217out_unregister_notifier:
1218        unregister_cld_notifier();
1219        return retval;
1220}
1221
1222static void __exit exit_nfsd(void)
1223{
1224        nfsd_reply_cache_shutdown();
1225        remove_proc_entry("fs/nfs/exports", NULL);
1226        remove_proc_entry("fs/nfs", NULL);
1227        nfsd_stat_shutdown();
1228        nfsd_lockd_shutdown();
1229        nfsd4_free_slabs();
1230        nfsd_fault_inject_cleanup();
1231        unregister_filesystem(&nfsd_fs_type);
1232        unregister_pernet_subsys(&nfsd_net_ops);
1233        unregister_cld_notifier();
1234}
1235
1236MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1237MODULE_LICENSE("GPL");
1238module_init(init_nfsd)
1239module_exit(exit_nfsd)
1240
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