fs/9p/v9fs.c

   1 /*
   2  *  linux/fs/9p/v9fs.c
   3  *
   4  *  This file contains functions assisting in mapping VFS to 9P2000
   5  *
   6  *  Copyright (C) 2004-2008 by Eric Van Hensbergen <[email protected]>
   7  *  Copyright (C) 2002 by Ron Minnich <[email protected]>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/errno.h>
  30 #include <linux/fs.h>
  31 #include <linux/sched.h>
  32 #include <linux/parser.h>
  33 #include <linux/idr.h>
  34 #include <linux/slab.h>
  35 #include <net/9p/9p.h>
  36 #include <net/9p/client.h>
  37 #include <net/9p/transport.h>
  38 #include "v9fs.h"
  39 #include "v9fs_vfs.h"
  40 #include "cache.h"
  41
  42 static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
  43 static LIST_HEAD(v9fs_sessionlist);
  44 struct kmem_cache *v9fs_inode_cache;
  45
  46 /*
  47  * Option Parsing (code inspired by NFS code)
  48  *  NOTE: each transport will parse its own options
  49  */
  50
  51 enum {
  52         /* Options that take integer arguments */
  53         Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
  54         /* String options */
  55         Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
  56         /* Options that take no arguments */
  57         Opt_nodevmap,
  58         /* Cache options */
  59         Opt_cache_loose, Opt_fscache, Opt_mmap,
  60         /* Access options */
  61         Opt_access, Opt_posixacl,
  62         /* Error token */
  63         Opt_err
  64 };
  65
  66 static const match_table_t tokens = {
  67         {Opt_debug, "debug=%x"},
  68         {Opt_dfltuid, "dfltuid=%u"},
  69         {Opt_dfltgid, "dfltgid=%u"},
  70         {Opt_afid, "afid=%u"},
  71         {Opt_uname, "uname=%s"},
  72         {Opt_remotename, "aname=%s"},
  73         {Opt_nodevmap, "nodevmap"},
  74         {Opt_cache, "cache=%s"},
  75         {Opt_cache_loose, "loose"},
  76         {Opt_fscache, "fscache"},
  77         {Opt_mmap, "mmap"},
  78         {Opt_cachetag, "cachetag=%s"},
  79         {Opt_access, "access=%s"},
  80         {Opt_posixacl, "posixacl"},
  81         {Opt_err, NULL}
  82 };
  83
  84 /* Interpret mount options for cache mode */
  85 static int get_cache_mode(char *s)
  86 {
  87         int version = -EINVAL;
  88
  89         if (!strcmp(s, "loose")) {
  90                 version = CACHE_LOOSE;
  91                 p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
  92         } else if (!strcmp(s, "fscache")) {
  93                 version = CACHE_FSCACHE;
  94                 p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
  95         } else if (!strcmp(s, "mmap")) {
  96                 version = CACHE_MMAP;
  97                 p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
  98         } else if (!strcmp(s, "none")) {
  99                 version = CACHE_NONE;
 100                 p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
 101         } else
 102                 pr_info("Unknown Cache mode %s\n", s);
 103         return version;
 104 }
 105
 106 /**
 107  * v9fs_parse_options - parse mount options into session structure
 108  * @v9ses: existing v9fs session information
 109  *
 110  * Return 0 upon success, -ERRNO upon failure.
 111  */
 112
 113 static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 114 {
 115         char *options, *tmp_options;
 116         substring_t args[MAX_OPT_ARGS];
 117         char *p;
 118         int option = 0;
 119         char *s, *e;
 120         int ret = 0;
 121
 122         /* setup defaults */
 123         v9ses->afid = ~0;
 124         v9ses->debug = 0;
 125         v9ses->cache = CACHE_NONE;
 126 #ifdef CONFIG_9P_FSCACHE
 127         v9ses->cachetag = NULL;
 128 #endif
 129
 130         if (!opts)
 131                 return 0;
 132
 133         tmp_options = kstrdup(opts, GFP_KERNEL);
 134         if (!tmp_options) {
 135                 ret = -ENOMEM;
 136                 goto fail_option_alloc;
 137         }
 138         options = tmp_options;
 139
 140         while ((p = strsep(&options, ",")) != NULL) {
 141                 int token, r;
 142                 if (!*p)
 143                         continue;
 144                 token = match_token(p, tokens, args);
 145                 switch (token) {
 146                 case Opt_debug:
 147                         r = match_int(&args[0], &option);
 148                         if (r < 0) {
 149                                 p9_debug(P9_DEBUG_ERROR,
 150                                          "integer field, but no integer?\n");
 151                                 ret = r;
 152                                 continue;
 153                         }
 154                         v9ses->debug = option;
 155 #ifdef CONFIG_NET_9P_DEBUG
 156                         p9_debug_level = option;
 157 #endif
 158                         break;
 159
 160                 case Opt_dfltuid:
 161                         r = match_int(&args[0], &option);
 162                         if (r < 0) {
 163                                 p9_debug(P9_DEBUG_ERROR,
 164                                          "integer field, but no integer?\n");
 165                                 ret = r;
 166                                 continue;
 167                         }
 168                         v9ses->dfltuid = make_kuid(current_user_ns(), option);
 169                         if (!uid_valid(v9ses->dfltuid)) {
 170                                 p9_debug(P9_DEBUG_ERROR,
 171                                          "uid field, but not a uid?\n");
 172                                 ret = -EINVAL;
 173                                 continue;
 174                         }
 175                         break;
 176                 case Opt_dfltgid:
 177                         r = match_int(&args[0], &option);
 178                         if (r < 0) {
 179                                 p9_debug(P9_DEBUG_ERROR,
 180                                          "integer field, but no integer?\n");
 181                                 ret = r;
 182                                 continue;
 183                         }
 184                         v9ses->dfltgid = make_kgid(current_user_ns(), option);
 185                         if (!gid_valid(v9ses->dfltgid)) {
 186                                 p9_debug(P9_DEBUG_ERROR,
 187                                          "gid field, but not a gid?\n");
 188                                 ret = -EINVAL;
 189                                 continue;
 190                         }
 191                         break;
 192                 case Opt_afid:
 193                         r = match_int(&args[0], &option);
 194                         if (r < 0) {
 195                                 p9_debug(P9_DEBUG_ERROR,
 196                                          "integer field, but no integer?\n");
 197                                 ret = r;
 198                                 continue;
 199                         }
 200                         v9ses->afid = option;
 201                         break;
 202                 case Opt_uname:
 203                         kfree(v9ses->uname);
 204                         v9ses->uname = match_strdup(&args[0]);
 205                         if (!v9ses->uname) {
 206                                 ret = -ENOMEM;
 207                                 goto free_and_return;
 208                         }
 209                         break;
 210                 case Opt_remotename:
 211                         kfree(v9ses->aname);
 212                         v9ses->aname = match_strdup(&args[0]);
 213                         if (!v9ses->aname) {
 214                                 ret = -ENOMEM;
 215                                 goto free_and_return;
 216                         }
 217                         break;
 218                 case Opt_nodevmap:
 219                         v9ses->nodev = 1;
 220                         break;
 221                 case Opt_cache_loose:
 222                         v9ses->cache = CACHE_LOOSE;
 223                         break;
 224                 case Opt_fscache:
 225                         v9ses->cache = CACHE_FSCACHE;
 226                         break;
 227                 case Opt_mmap:
 228                         v9ses->cache = CACHE_MMAP;
 229                         break;
 230                 case Opt_cachetag:
 231 #ifdef CONFIG_9P_FSCACHE
 232                         v9ses->cachetag = match_strdup(&args[0]);
 233 #endif
 234                         break;
 235                 case Opt_cache:
 236                         s = match_strdup(&args[0]);
 237                         if (!s) {
 238                                 ret = -ENOMEM;
 239                                 p9_debug(P9_DEBUG_ERROR,
 240                                          "problem allocating copy of cache arg\n");
 241                                 goto free_and_return;
 242                         }
 243                         ret = get_cache_mode(s);
 244                         if (ret == -EINVAL) {
 245                                 kfree(s);
 246                                 goto free_and_return;
 247                         }
 248
 249                         v9ses->cache = ret;
 250                         kfree(s);
 251                         break;
 252
 253                 case Opt_access:
 254                         s = match_strdup(&args[0]);
 255                         if (!s) {
 256                                 ret = -ENOMEM;
 257                                 p9_debug(P9_DEBUG_ERROR,
 258                                          "problem allocating copy of access arg\n");
 259                                 goto free_and_return;
 260                         }
 261
 262                         v9ses->flags &= ~V9FS_ACCESS_MASK;
 263                         if (strcmp(s, "user") == 0)
 264                                 v9ses->flags |= V9FS_ACCESS_USER;
 265                         else if (strcmp(s, "any") == 0)
 266                                 v9ses->flags |= V9FS_ACCESS_ANY;
 267                         else if (strcmp(s, "client") == 0) {
 268                                 v9ses->flags |= V9FS_ACCESS_CLIENT;
 269                         } else {
 270                                 uid_t uid;
 271                                 v9ses->flags |= V9FS_ACCESS_SINGLE;
 272                                 uid = simple_strtoul(s, &e, 10);
 273                                 if (*e != '\0') {
 274                                         ret = -EINVAL;
 275                                         pr_info("Unknown access argument %s\n",
 276                                                 s);
 277                                         kfree(s);
 278                                         goto free_and_return;
 279                                 }
 280                                 v9ses->uid = make_kuid(current_user_ns(), uid);
 281                                 if (!uid_valid(v9ses->uid)) {
 282                                         ret = -EINVAL;
 283                                         pr_info("Uknown uid %s\n", s);
 284                                         kfree(s);
 285                                         goto free_and_return;
 286                                 }
 287                         }
 288
 289                         kfree(s);
 290                         break;
 291
 292                 case Opt_posixacl:
 293 #ifdef CONFIG_9P_FS_POSIX_ACL
 294                         v9ses->flags |= V9FS_POSIX_ACL;
 295 #else
 296                         p9_debug(P9_DEBUG_ERROR,
 297                                  "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
 298 #endif
 299                         break;
 300
 301                 default:
 302                         continue;
 303                 }
 304         }
 305
 306 free_and_return:
 307         kfree(tmp_options);
 308 fail_option_alloc:
 309         return ret;
 310 }
 311
 312 /**
 313  * v9fs_session_init - initialize session
 314  * @v9ses: session information structure
 315  * @dev_name: device being mounted
 316  * @data: options
 317  *
 318  */
 319
 320 struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 321                   const char *dev_name, char *data)
 322 {
 323         struct p9_fid *fid;
 324         int rc = -ENOMEM;
 325
 326         v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
 327         if (!v9ses->uname)
 328                 goto err_names;
 329
 330         v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
 331         if (!v9ses->aname)
 332                 goto err_names;
 333         init_rwsem(&v9ses->rename_sem);
 334
 335         rc = bdi_setup_and_register(&v9ses->bdi, "9p");
 336         if (rc)
 337                 goto err_names;
 338
 339         v9ses->uid = INVALID_UID;
 340         v9ses->dfltuid = V9FS_DEFUID;
 341         v9ses->dfltgid = V9FS_DEFGID;
 342
 343         v9ses->clnt = p9_client_create(dev_name, data);
 344         if (IS_ERR(v9ses->clnt)) {
 345                 rc = PTR_ERR(v9ses->clnt);
 346                 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
 347                 goto err_bdi;
 348         }
 349
 350         v9ses->flags = V9FS_ACCESS_USER;
 351
 352         if (p9_is_proto_dotl(v9ses->clnt)) {
 353                 v9ses->flags = V9FS_ACCESS_CLIENT;
 354                 v9ses->flags |= V9FS_PROTO_2000L;
 355         } else if (p9_is_proto_dotu(v9ses->clnt)) {
 356                 v9ses->flags |= V9FS_PROTO_2000U;
 357         }
 358
 359         rc = v9fs_parse_options(v9ses, data);
 360         if (rc < 0)
 361                 goto err_clnt;
 362
 363         v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
 364
 365         if (!v9fs_proto_dotl(v9ses) &&
 366             ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
 367                 /*
 368                  * We support ACCESS_CLIENT only for dotl.
 369                  * Fall back to ACCESS_USER
 370                  */
 371                 v9ses->flags &= ~V9FS_ACCESS_MASK;
 372                 v9ses->flags |= V9FS_ACCESS_USER;
 373         }
 374         /*FIXME !! */
 375         /* for legacy mode, fall back to V9FS_ACCESS_ANY */
 376         if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
 377                 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
 378
 379                 v9ses->flags &= ~V9FS_ACCESS_MASK;
 380                 v9ses->flags |= V9FS_ACCESS_ANY;
 381                 v9ses->uid = INVALID_UID;
 382         }
 383         if (!v9fs_proto_dotl(v9ses) ||
 384                 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
 385                 /*
 386                  * We support ACL checks on clinet only if the protocol is
 387                  * 9P2000.L and access is V9FS_ACCESS_CLIENT.
 388                  */
 389                 v9ses->flags &= ~V9FS_ACL_MASK;
 390         }
 391
 392         fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
 393                                                         v9ses->aname);
 394         if (IS_ERR(fid)) {
 395                 rc = PTR_ERR(fid);
 396                 p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
 397                 goto err_clnt;
 398         }
 399
 400         if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
 401                 fid->uid = v9ses->uid;
 402         else
 403                 fid->uid = INVALID_UID;
 404
 405 #ifdef CONFIG_9P_FSCACHE
 406         /* register the session for caching */
 407         v9fs_cache_session_get_cookie(v9ses);
 408 #endif
 409         spin_lock(&v9fs_sessionlist_lock);
 410         list_add(&v9ses->slist, &v9fs_sessionlist);
 411         spin_unlock(&v9fs_sessionlist_lock);
 412
 413         return fid;
 414
 415 err_clnt:
 416         p9_client_destroy(v9ses->clnt);
 417 err_bdi:
 418         bdi_destroy(&v9ses->bdi);
 419 err_names:
 420         kfree(v9ses->uname);
 421         kfree(v9ses->aname);
 422         return ERR_PTR(rc);
 423 }
 424
 425 /**
 426  * v9fs_session_close - shutdown a session
 427  * @v9ses: session information structure
 428  *
 429  */
 430
 431 void v9fs_session_close(struct v9fs_session_info *v9ses)
 432 {
 433         if (v9ses->clnt) {
 434                 p9_client_destroy(v9ses->clnt);
 435                 v9ses->clnt = NULL;
 436         }
 437
 438 #ifdef CONFIG_9P_FSCACHE
 439         if (v9ses->fscache) {
 440                 v9fs_cache_session_put_cookie(v9ses);
 441                 kfree(v9ses->cachetag);
 442         }
 443 #endif
 444         kfree(v9ses->uname);
 445         kfree(v9ses->aname);
 446
 447         bdi_destroy(&v9ses->bdi);
 448
 449         spin_lock(&v9fs_sessionlist_lock);
 450         list_del(&v9ses->slist);
 451         spin_unlock(&v9fs_sessionlist_lock);
 452 }
 453
 454 /**
 455  * v9fs_session_cancel - terminate a session
 456  * @v9ses: session to terminate
 457  *
 458  * mark transport as disconnected and cancel all pending requests.
 459  */
 460
 461 void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
 462         p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
 463         p9_client_disconnect(v9ses->clnt);
 464 }
 465
 466 /**
 467  * v9fs_session_begin_cancel - Begin terminate of a session
 468  * @v9ses: session to terminate
 469  *
 470  * After this call we don't allow any request other than clunk.
 471  */
 472
 473 void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
 474 {
 475         p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
 476         p9_client_begin_disconnect(v9ses->clnt);
 477 }
 478
 479 extern int v9fs_error_init(void);
 480
 481 static struct kobject *v9fs_kobj;
 482
 483 #ifdef CONFIG_9P_FSCACHE
 484 /**
 485  * caches_show - list caches associated with a session
 486  *
 487  * Returns the size of buffer written.
 488  */
 489
 490 static ssize_t caches_show(struct kobject *kobj,
 491                            struct kobj_attribute *attr,
 492                            char *buf)
 493 {
 494         ssize_t n = 0, count = 0, limit = PAGE_SIZE;
 495         struct v9fs_session_info *v9ses;
 496
 497         spin_lock(&v9fs_sessionlist_lock);
 498         list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
 499                 if (v9ses->cachetag) {
 500                         n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
 501                         if (n < 0) {
 502                                 count = n;
 503                                 break;
 504                         }
 505
 506                         count += n;
 507                         limit -= n;
 508                 }
 509         }
 510
 511         spin_unlock(&v9fs_sessionlist_lock);
 512         return count;
 513 }
 514
 515 static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
 516 #endif /* CONFIG_9P_FSCACHE */
 517
 518 static struct attribute *v9fs_attrs[] = {
 519 #ifdef CONFIG_9P_FSCACHE
 520         &v9fs_attr_cache.attr,
 521 #endif
 522         NULL,
 523 };
 524
 525 static struct attribute_group v9fs_attr_group = {
 526         .attrs = v9fs_attrs,
 527 };
 528
 529 /**
 530  * v9fs_sysfs_init - Initialize the v9fs sysfs interface
 531  *
 532  */
 533
 534 static int __init v9fs_sysfs_init(void)
 535 {
 536         v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
 537         if (!v9fs_kobj)
 538                 return -ENOMEM;
 539
 540         if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
 541                 kobject_put(v9fs_kobj);
 542                 return -ENOMEM;
 543         }
 544
 545         return 0;
 546 }
 547
 548 /**
 549  * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
 550  *
 551  */
 552
 553 static void v9fs_sysfs_cleanup(void)
 554 {
 555         sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
 556         kobject_put(v9fs_kobj);
 557 }
 558
 559 static void v9fs_inode_init_once(void *foo)
 560 {
 561         struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
 562 #ifdef CONFIG_9P_FSCACHE
 563         v9inode->fscache = NULL;
 564 #endif
 565         memset(&v9inode->qid, 0, sizeof(v9inode->qid));
 566         inode_init_once(&v9inode->vfs_inode);
 567 }
 568
 569 /**
 570  * v9fs_init_inode_cache - initialize a cache for 9P
 571  * Returns 0 on success.
 572  */
 573 static int v9fs_init_inode_cache(void)
 574 {
 575         v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
 576                                           sizeof(struct v9fs_inode),
 577                                           0, (SLAB_RECLAIM_ACCOUNT|
 578                                               SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 579                                           v9fs_inode_init_once);
 580         if (!v9fs_inode_cache)
 581                 return -ENOMEM;
 582
 583         return 0;
 584 }
 585
 586 /**
 587  * v9fs_destroy_inode_cache - destroy the cache of 9P inode
 588  *
 589  */
 590 static void v9fs_destroy_inode_cache(void)
 591 {
 592         /*
 593          * Make sure all delayed rcu free inodes are flushed before we
 594          * destroy cache.
 595          */
 596         rcu_barrier();
 597         kmem_cache_destroy(v9fs_inode_cache);
 598 }
 599
 600 static int v9fs_cache_register(void)
 601 {
 602         int ret;
 603         ret = v9fs_init_inode_cache();
 604         if (ret < 0)
 605                 return ret;
 606 #ifdef CONFIG_9P_FSCACHE
 607         ret = fscache_register_netfs(&v9fs_cache_netfs);
 608         if (ret < 0)
 609                 v9fs_destroy_inode_cache();
 610 #endif
 611         return ret;
 612 }
 613
 614 static void v9fs_cache_unregister(void)
 615 {
 616         v9fs_destroy_inode_cache();
 617 #ifdef CONFIG_9P_FSCACHE
 618         fscache_unregister_netfs(&v9fs_cache_netfs);
 619 #endif
 620 }
 621
 622 /**
 623  * init_v9fs - Initialize module
 624  *
 625  */
 626
 627 static int __init init_v9fs(void)
 628 {
 629         int err;
 630         pr_info("Installing v9fs 9p2000 file system support\n");
 631         /* TODO: Setup list of registered trasnport modules */
 632
 633         err = v9fs_cache_register();
 634         if (err < 0) {
 635                 pr_err("Failed to register v9fs for caching\n");
 636                 return err;
 637         }
 638
 639         err = v9fs_sysfs_init();
 640         if (err < 0) {
 641                 pr_err("Failed to register with sysfs\n");
 642                 goto out_cache;
 643         }
 644         err = register_filesystem(&v9fs_fs_type);
 645         if (err < 0) {
 646                 pr_err("Failed to register filesystem\n");
 647                 goto out_sysfs_cleanup;
 648         }
 649
 650         return 0;
 651
 652 out_sysfs_cleanup:
 653         v9fs_sysfs_cleanup();
 654
 655 out_cache:
 656         v9fs_cache_unregister();
 657
 658         return err;
 659 }
 660
 661 /**
 662  * exit_v9fs - shutdown module
 663  *
 664  */
 665
 666 static void __exit exit_v9fs(void)
 667 {
 668         v9fs_sysfs_cleanup();
 669         v9fs_cache_unregister();
 670         unregister_filesystem(&v9fs_fs_type);
 671 }
 672
 673 module_init(init_v9fs)
 674 module_exit(exit_v9fs)
 675
 676 MODULE_AUTHOR("Latchesar Ionkov <[email protected]>");
 677 MODULE_AUTHOR("Eric Van Hensbergen <[email protected]>");
 678 MODULE_AUTHOR("Ron Minnich <[email protected]>");
 679 MODULE_LICENSE("GPL");