1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/9p/v9fs.c 4 * 5 * This file contains functions assisting in mapping VFS to 9P2000 6 * 7 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> 8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/module.h> 14 #include <linux/errno.h> 15 #include <linux/fs.h> 16 #include <linux/sched.h> 17 #include <linux/cred.h> 18 #include <linux/parser.h> 19 #include <linux/idr.h> 20 #include <linux/slab.h> 21 #include <linux/seq_file.h> 22 #include <net/9p/9p.h> 23 #include <net/9p/client.h> 24 #include <net/9p/transport.h> 25 #include "v9fs.h" 26 #include "v9fs_vfs.h" 27 #include "cache.h" 28 29 static DEFINE_SPINLOCK(v9fs_sessionlist_lock); 30 static LIST_HEAD(v9fs_sessionlist); 31 struct kmem_cache *v9fs_inode_cache; 32 33 /* 34 * Option Parsing (code inspired by NFS code) 35 * NOTE: each transport will parse its own options 36 */ 37 38 enum { 39 /* Options that take integer arguments */ 40 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, 41 /* String options */ 42 Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag, 43 /* Options that take no arguments */ 44 Opt_nodevmap, 45 /* Cache options */ 46 Opt_cache_loose, Opt_fscache, Opt_mmap, 47 /* Access options */ 48 Opt_access, Opt_posixacl, 49 /* Lock timeout option */ 50 Opt_locktimeout, 51 /* Error token */ 52 Opt_err 53 }; 54 55 static const match_table_t tokens = { 56 {Opt_debug, "debug=%x"}, 57 {Opt_dfltuid, "dfltuid=%u"}, 58 {Opt_dfltgid, "dfltgid=%u"}, 59 {Opt_afid, "afid=%u"}, 60 {Opt_uname, "uname=%s"}, 61 {Opt_remotename, "aname=%s"}, 62 {Opt_nodevmap, "nodevmap"}, 63 {Opt_cache, "cache=%s"}, 64 {Opt_cache_loose, "loose"}, 65 {Opt_fscache, "fscache"}, 66 {Opt_mmap, "mmap"}, 67 {Opt_cachetag, "cachetag=%s"}, 68 {Opt_access, "access=%s"}, 69 {Opt_posixacl, "posixacl"}, 70 {Opt_locktimeout, "locktimeout=%u"}, 71 {Opt_err, NULL} 72 }; 73 74 static const char *const v9fs_cache_modes[nr__p9_cache_modes] = { 75 [CACHE_NONE] = "none", 76 [CACHE_MMAP] = "mmap", 77 [CACHE_LOOSE] = "loose", 78 [CACHE_FSCACHE] = "fscache", 79 }; 80 81 /* Interpret mount options for cache mode */ 82 static int get_cache_mode(char *s) 83 { 84 int version = -EINVAL; 85 86 if (!strcmp(s, "loose")) { 87 version = CACHE_LOOSE; 88 p9_debug(P9_DEBUG_9P, "Cache mode: loose\n"); 89 } else if (!strcmp(s, "fscache")) { 90 version = CACHE_FSCACHE; 91 p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n"); 92 } else if (!strcmp(s, "mmap")) { 93 version = CACHE_MMAP; 94 p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n"); 95 } else if (!strcmp(s, "none")) { 96 version = CACHE_NONE; 97 p9_debug(P9_DEBUG_9P, "Cache mode: none\n"); 98 } else 99 pr_info("Unknown Cache mode %s\n", s); 100 return version; 101 } 102 103 /* 104 * Display the mount options in /proc/mounts. 105 */ 106 int v9fs_show_options(struct seq_file *m, struct dentry *root) 107 { 108 struct v9fs_session_info *v9ses = root->d_sb->s_fs_info; 109 110 if (v9ses->debug) 111 seq_printf(m, ",debug=%x", v9ses->debug); 112 if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID)) 113 seq_printf(m, ",dfltuid=%u", 114 from_kuid_munged(&init_user_ns, v9ses->dfltuid)); 115 if (!gid_eq(v9ses->dfltgid, V9FS_DEFGID)) 116 seq_printf(m, ",dfltgid=%u", 117 from_kgid_munged(&init_user_ns, v9ses->dfltgid)); 118 if (v9ses->afid != ~0) 119 seq_printf(m, ",afid=%u", v9ses->afid); 120 if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0) 121 seq_printf(m, ",uname=%s", v9ses->uname); 122 if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0) 123 seq_printf(m, ",aname=%s", v9ses->aname); 124 if (v9ses->nodev) 125 seq_puts(m, ",nodevmap"); 126 if (v9ses->cache) 127 seq_printf(m, ",%s", v9fs_cache_modes[v9ses->cache]); 128 #ifdef CONFIG_9P_FSCACHE 129 if (v9ses->cachetag && v9ses->cache == CACHE_FSCACHE) 130 seq_printf(m, ",cachetag=%s", v9ses->cachetag); 131 #endif 132 133 switch (v9ses->flags & V9FS_ACCESS_MASK) { 134 case V9FS_ACCESS_USER: 135 seq_puts(m, ",access=user"); 136 break; 137 case V9FS_ACCESS_ANY: 138 seq_puts(m, ",access=any"); 139 break; 140 case V9FS_ACCESS_CLIENT: 141 seq_puts(m, ",access=client"); 142 break; 143 case V9FS_ACCESS_SINGLE: 144 seq_printf(m, ",access=%u", 145 from_kuid_munged(&init_user_ns, v9ses->uid)); 146 break; 147 } 148 149 if (v9ses->flags & V9FS_POSIX_ACL) 150 seq_puts(m, ",posixacl"); 151 152 return p9_show_client_options(m, v9ses->clnt); 153 } 154 155 /** 156 * v9fs_parse_options - parse mount options into session structure 157 * @v9ses: existing v9fs session information 158 * 159 * Return 0 upon success, -ERRNO upon failure. 160 */ 161 162 static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) 163 { 164 char *options, *tmp_options; 165 substring_t args[MAX_OPT_ARGS]; 166 char *p; 167 int option = 0; 168 char *s, *e; 169 int ret = 0; 170 171 /* setup defaults */ 172 v9ses->afid = ~0; 173 v9ses->debug = 0; 174 v9ses->cache = CACHE_NONE; 175 #ifdef CONFIG_9P_FSCACHE 176 v9ses->cachetag = NULL; 177 #endif 178 v9ses->session_lock_timeout = P9_LOCK_TIMEOUT; 179 180 if (!opts) 181 return 0; 182 183 tmp_options = kstrdup(opts, GFP_KERNEL); 184 if (!tmp_options) { 185 ret = -ENOMEM; 186 goto fail_option_alloc; 187 } 188 options = tmp_options; 189 190 while ((p = strsep(&options, ",")) != NULL) { 191 int token, r; 192 if (!*p) 193 continue; 194 token = match_token(p, tokens, args); 195 switch (token) { 196 case Opt_debug: 197 r = match_int(&args[0], &option); 198 if (r < 0) { 199 p9_debug(P9_DEBUG_ERROR, 200 "integer field, but no integer?\n"); 201 ret = r; 202 } else { 203 v9ses->debug = option; 204 #ifdef CONFIG_NET_9P_DEBUG 205 p9_debug_level = option; 206 #endif 207 } 208 break; 209 210 case Opt_dfltuid: 211 r = match_int(&args[0], &option); 212 if (r < 0) { 213 p9_debug(P9_DEBUG_ERROR, 214 "integer field, but no integer?\n"); 215 ret = r; 216 continue; 217 } 218 v9ses->dfltuid = make_kuid(current_user_ns(), option); 219 if (!uid_valid(v9ses->dfltuid)) { 220 p9_debug(P9_DEBUG_ERROR, 221 "uid field, but not a uid?\n"); 222 ret = -EINVAL; 223 } 224 break; 225 case Opt_dfltgid: 226 r = match_int(&args[0], &option); 227 if (r < 0) { 228 p9_debug(P9_DEBUG_ERROR, 229 "integer field, but no integer?\n"); 230 ret = r; 231 continue; 232 } 233 v9ses->dfltgid = make_kgid(current_user_ns(), option); 234 if (!gid_valid(v9ses->dfltgid)) { 235 p9_debug(P9_DEBUG_ERROR, 236 "gid field, but not a gid?\n"); 237 ret = -EINVAL; 238 } 239 break; 240 case Opt_afid: 241 r = match_int(&args[0], &option); 242 if (r < 0) { 243 p9_debug(P9_DEBUG_ERROR, 244 "integer field, but no integer?\n"); 245 ret = r; 246 } else { 247 v9ses->afid = option; 248 } 249 break; 250 case Opt_uname: 251 kfree(v9ses->uname); 252 v9ses->uname = match_strdup(&args[0]); 253 if (!v9ses->uname) { 254 ret = -ENOMEM; 255 goto free_and_return; 256 } 257 break; 258 case Opt_remotename: 259 kfree(v9ses->aname); 260 v9ses->aname = match_strdup(&args[0]); 261 if (!v9ses->aname) { 262 ret = -ENOMEM; 263 goto free_and_return; 264 } 265 break; 266 case Opt_nodevmap: 267 v9ses->nodev = 1; 268 break; 269 case Opt_cache_loose: 270 v9ses->cache = CACHE_LOOSE; 271 break; 272 case Opt_fscache: 273 v9ses->cache = CACHE_FSCACHE; 274 break; 275 case Opt_mmap: 276 v9ses->cache = CACHE_MMAP; 277 break; 278 case Opt_cachetag: 279 #ifdef CONFIG_9P_FSCACHE 280 kfree(v9ses->cachetag); 281 v9ses->cachetag = match_strdup(&args[0]); 282 if (!v9ses->cachetag) { 283 ret = -ENOMEM; 284 goto free_and_return; 285 } 286 #endif 287 break; 288 case Opt_cache: 289 s = match_strdup(&args[0]); 290 if (!s) { 291 ret = -ENOMEM; 292 p9_debug(P9_DEBUG_ERROR, 293 "problem allocating copy of cache arg\n"); 294 goto free_and_return; 295 } 296 r = get_cache_mode(s); 297 if (r < 0) 298 ret = r; 299 else 300 v9ses->cache = r; 301 302 kfree(s); 303 break; 304 305 case Opt_access: 306 s = match_strdup(&args[0]); 307 if (!s) { 308 ret = -ENOMEM; 309 p9_debug(P9_DEBUG_ERROR, 310 "problem allocating copy of access arg\n"); 311 goto free_and_return; 312 } 313 314 v9ses->flags &= ~V9FS_ACCESS_MASK; 315 if (strcmp(s, "user") == 0) 316 v9ses->flags |= V9FS_ACCESS_USER; 317 else if (strcmp(s, "any") == 0) 318 v9ses->flags |= V9FS_ACCESS_ANY; 319 else if (strcmp(s, "client") == 0) { 320 v9ses->flags |= V9FS_ACCESS_CLIENT; 321 } else { 322 uid_t uid; 323 v9ses->flags |= V9FS_ACCESS_SINGLE; 324 uid = simple_strtoul(s, &e, 10); 325 if (*e != '\0') { 326 ret = -EINVAL; 327 pr_info("Unknown access argument %s\n", 328 s); 329 kfree(s); 330 continue; 331 } 332 v9ses->uid = make_kuid(current_user_ns(), uid); 333 if (!uid_valid(v9ses->uid)) { 334 ret = -EINVAL; 335 pr_info("Unknown uid %s\n", s); 336 } 337 } 338 339 kfree(s); 340 break; 341 342 case Opt_posixacl: 343 #ifdef CONFIG_9P_FS_POSIX_ACL 344 v9ses->flags |= V9FS_POSIX_ACL; 345 #else 346 p9_debug(P9_DEBUG_ERROR, 347 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n"); 348 #endif 349 break; 350 351 case Opt_locktimeout: 352 r = match_int(&args[0], &option); 353 if (r < 0) { 354 p9_debug(P9_DEBUG_ERROR, 355 "integer field, but no integer?\n"); 356 ret = r; 357 continue; 358 } 359 if (option < 1) { 360 p9_debug(P9_DEBUG_ERROR, 361 "locktimeout must be a greater than zero integer.\n"); 362 ret = -EINVAL; 363 continue; 364 } 365 v9ses->session_lock_timeout = (long)option * HZ; 366 break; 367 368 default: 369 continue; 370 } 371 } 372 373 free_and_return: 374 kfree(tmp_options); 375 fail_option_alloc: 376 return ret; 377 } 378 379 /** 380 * v9fs_session_init - initialize session 381 * @v9ses: session information structure 382 * @dev_name: device being mounted 383 * @data: options 384 * 385 */ 386 387 struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, 388 const char *dev_name, char *data) 389 { 390 struct p9_fid *fid; 391 int rc = -ENOMEM; 392 393 v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL); 394 if (!v9ses->uname) 395 goto err_names; 396 397 v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL); 398 if (!v9ses->aname) 399 goto err_names; 400 init_rwsem(&v9ses->rename_sem); 401 402 v9ses->uid = INVALID_UID; 403 v9ses->dfltuid = V9FS_DEFUID; 404 v9ses->dfltgid = V9FS_DEFGID; 405 406 v9ses->clnt = p9_client_create(dev_name, data); 407 if (IS_ERR(v9ses->clnt)) { 408 rc = PTR_ERR(v9ses->clnt); 409 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n"); 410 goto err_names; 411 } 412 413 v9ses->flags = V9FS_ACCESS_USER; 414 415 if (p9_is_proto_dotl(v9ses->clnt)) { 416 v9ses->flags = V9FS_ACCESS_CLIENT; 417 v9ses->flags |= V9FS_PROTO_2000L; 418 } else if (p9_is_proto_dotu(v9ses->clnt)) { 419 v9ses->flags |= V9FS_PROTO_2000U; 420 } 421 422 rc = v9fs_parse_options(v9ses, data); 423 if (rc < 0) 424 goto err_clnt; 425 426 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; 427 428 if (!v9fs_proto_dotl(v9ses) && 429 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { 430 /* 431 * We support ACCESS_CLIENT only for dotl. 432 * Fall back to ACCESS_USER 433 */ 434 v9ses->flags &= ~V9FS_ACCESS_MASK; 435 v9ses->flags |= V9FS_ACCESS_USER; 436 } 437 /*FIXME !! */ 438 /* for legacy mode, fall back to V9FS_ACCESS_ANY */ 439 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && 440 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { 441 442 v9ses->flags &= ~V9FS_ACCESS_MASK; 443 v9ses->flags |= V9FS_ACCESS_ANY; 444 v9ses->uid = INVALID_UID; 445 } 446 if (!v9fs_proto_dotl(v9ses) || 447 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { 448 /* 449 * We support ACL checks on clinet only if the protocol is 450 * 9P2000.L and access is V9FS_ACCESS_CLIENT. 451 */ 452 v9ses->flags &= ~V9FS_ACL_MASK; 453 } 454 455 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID, 456 v9ses->aname); 457 if (IS_ERR(fid)) { 458 rc = PTR_ERR(fid); 459 p9_debug(P9_DEBUG_ERROR, "cannot attach\n"); 460 goto err_clnt; 461 } 462 463 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) 464 fid->uid = v9ses->uid; 465 else 466 fid->uid = INVALID_UID; 467 468 #ifdef CONFIG_9P_FSCACHE 469 /* register the session for caching */ 470 v9fs_cache_session_get_cookie(v9ses); 471 #endif 472 spin_lock(&v9fs_sessionlist_lock); 473 list_add(&v9ses->slist, &v9fs_sessionlist); 474 spin_unlock(&v9fs_sessionlist_lock); 475 476 return fid; 477 478 err_clnt: 479 #ifdef CONFIG_9P_FSCACHE 480 kfree(v9ses->cachetag); 481 #endif 482 p9_client_destroy(v9ses->clnt); 483 err_names: 484 kfree(v9ses->uname); 485 kfree(v9ses->aname); 486 return ERR_PTR(rc); 487 } 488 489 /** 490 * v9fs_session_close - shutdown a session 491 * @v9ses: session information structure 492 * 493 */ 494 495 void v9fs_session_close(struct v9fs_session_info *v9ses) 496 { 497 if (v9ses->clnt) { 498 p9_client_destroy(v9ses->clnt); 499 v9ses->clnt = NULL; 500 } 501 502 #ifdef CONFIG_9P_FSCACHE 503 if (v9ses->fscache) 504 v9fs_cache_session_put_cookie(v9ses); 505 kfree(v9ses->cachetag); 506 #endif 507 kfree(v9ses->uname); 508 kfree(v9ses->aname); 509 510 spin_lock(&v9fs_sessionlist_lock); 511 list_del(&v9ses->slist); 512 spin_unlock(&v9fs_sessionlist_lock); 513 } 514 515 /** 516 * v9fs_session_cancel - terminate a session 517 * @v9ses: session to terminate 518 * 519 * mark transport as disconnected and cancel all pending requests. 520 */ 521 522 void v9fs_session_cancel(struct v9fs_session_info *v9ses) { 523 p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); 524 p9_client_disconnect(v9ses->clnt); 525 } 526 527 /** 528 * v9fs_session_begin_cancel - Begin terminate of a session 529 * @v9ses: session to terminate 530 * 531 * After this call we don't allow any request other than clunk. 532 */ 533 534 void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) 535 { 536 p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); 537 p9_client_begin_disconnect(v9ses->clnt); 538 } 539 540 extern int v9fs_error_init(void); 541 542 static struct kobject *v9fs_kobj; 543 544 #ifdef CONFIG_9P_FSCACHE 545 /** 546 * caches_show - list caches associated with a session 547 * 548 * Returns the size of buffer written. 549 */ 550 551 static ssize_t caches_show(struct kobject *kobj, 552 struct kobj_attribute *attr, 553 char *buf) 554 { 555 ssize_t n = 0, count = 0, limit = PAGE_SIZE; 556 struct v9fs_session_info *v9ses; 557 558 spin_lock(&v9fs_sessionlist_lock); 559 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { 560 if (v9ses->cachetag) { 561 n = snprintf(buf, limit, "%s\n", v9ses->cachetag); 562 if (n < 0) { 563 count = n; 564 break; 565 } 566 567 count += n; 568 limit -= n; 569 } 570 } 571 572 spin_unlock(&v9fs_sessionlist_lock); 573 return count; 574 } 575 576 static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); 577 #endif /* CONFIG_9P_FSCACHE */ 578 579 static struct attribute *v9fs_attrs[] = { 580 #ifdef CONFIG_9P_FSCACHE 581 &v9fs_attr_cache.attr, 582 #endif 583 NULL, 584 }; 585 586 static const struct attribute_group v9fs_attr_group = { 587 .attrs = v9fs_attrs, 588 }; 589 590 /** 591 * v9fs_sysfs_init - Initialize the v9fs sysfs interface 592 * 593 */ 594 595 static int __init v9fs_sysfs_init(void) 596 { 597 v9fs_kobj = kobject_create_and_add("9p", fs_kobj); 598 if (!v9fs_kobj) 599 return -ENOMEM; 600 601 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { 602 kobject_put(v9fs_kobj); 603 return -ENOMEM; 604 } 605 606 return 0; 607 } 608 609 /** 610 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface 611 * 612 */ 613 614 static void v9fs_sysfs_cleanup(void) 615 { 616 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); 617 kobject_put(v9fs_kobj); 618 } 619 620 static void v9fs_inode_init_once(void *foo) 621 { 622 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; 623 #ifdef CONFIG_9P_FSCACHE 624 v9inode->fscache = NULL; 625 #endif 626 memset(&v9inode->qid, 0, sizeof(v9inode->qid)); 627 inode_init_once(&v9inode->vfs_inode); 628 } 629 630 /** 631 * v9fs_init_inode_cache - initialize a cache for 9P 632 * Returns 0 on success. 633 */ 634 static int v9fs_init_inode_cache(void) 635 { 636 v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", 637 sizeof(struct v9fs_inode), 638 0, (SLAB_RECLAIM_ACCOUNT| 639 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 640 v9fs_inode_init_once); 641 if (!v9fs_inode_cache) 642 return -ENOMEM; 643 644 return 0; 645 } 646 647 /** 648 * v9fs_destroy_inode_cache - destroy the cache of 9P inode 649 * 650 */ 651 static void v9fs_destroy_inode_cache(void) 652 { 653 /* 654 * Make sure all delayed rcu free inodes are flushed before we 655 * destroy cache. 656 */ 657 rcu_barrier(); 658 kmem_cache_destroy(v9fs_inode_cache); 659 } 660 661 static int v9fs_cache_register(void) 662 { 663 int ret; 664 ret = v9fs_init_inode_cache(); 665 if (ret < 0) 666 return ret; 667 #ifdef CONFIG_9P_FSCACHE 668 ret = fscache_register_netfs(&v9fs_cache_netfs); 669 if (ret < 0) 670 v9fs_destroy_inode_cache(); 671 #endif 672 return ret; 673 } 674 675 static void v9fs_cache_unregister(void) 676 { 677 v9fs_destroy_inode_cache(); 678 #ifdef CONFIG_9P_FSCACHE 679 fscache_unregister_netfs(&v9fs_cache_netfs); 680 #endif 681 } 682 683 /** 684 * init_v9fs - Initialize module 685 * 686 */ 687 688 static int __init init_v9fs(void) 689 { 690 int err; 691 pr_info("Installing v9fs 9p2000 file system support\n"); 692 /* TODO: Setup list of registered trasnport modules */ 693 694 err = v9fs_cache_register(); 695 if (err < 0) { 696 pr_err("Failed to register v9fs for caching\n"); 697 return err; 698 } 699 700 err = v9fs_sysfs_init(); 701 if (err < 0) { 702 pr_err("Failed to register with sysfs\n"); 703 goto out_cache; 704 } 705 err = register_filesystem(&v9fs_fs_type); 706 if (err < 0) { 707 pr_err("Failed to register filesystem\n"); 708 goto out_sysfs_cleanup; 709 } 710 711 return 0; 712 713 out_sysfs_cleanup: 714 v9fs_sysfs_cleanup(); 715 716 out_cache: 717 v9fs_cache_unregister(); 718 719 return err; 720 } 721 722 /** 723 * exit_v9fs - shutdown module 724 * 725 */ 726 727 static void __exit exit_v9fs(void) 728 { 729 v9fs_sysfs_cleanup(); 730 v9fs_cache_unregister(); 731 unregister_filesystem(&v9fs_fs_type); 732 } 733 734 module_init(init_v9fs) 735 module_exit(exit_v9fs) 736 737 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); 738 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); 739 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); 740 MODULE_LICENSE("GPL"); 741