1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file contains functions assisting in mapping VFS to 9P2000
4 *
5 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/sched.h>
15#include <linux/cred.h>
16#include <linux/parser.h>
17#include <linux/slab.h>
18#include <linux/seq_file.h>
19#include <net/9p/9p.h>
20#include <net/9p/client.h>
21#include <net/9p/transport.h>
22#include "v9fs.h"
23#include "v9fs_vfs.h"
24#include "cache.h"
25
26static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
27static LIST_HEAD(v9fs_sessionlist);
28struct kmem_cache *v9fs_inode_cache;
29
30/*
31 * Option Parsing (code inspired by NFS code)
32 * NOTE: each transport will parse its own options
33 */
34
35enum {
36 /* Options that take integer arguments */
37 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
38 /* String options */
39 Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
40 /* Options that take no arguments */
41 Opt_nodevmap, Opt_noxattr, Opt_directio, Opt_ignoreqv,
42 /* Access options */
43 Opt_access, Opt_posixacl,
44 /* Lock timeout option */
45 Opt_locktimeout,
46 /* Error token */
47 Opt_err
48};
49
50static const match_table_t tokens = {
51 {Opt_debug, "debug=%x"},
52 {.token: Opt_dfltuid, .pattern: "dfltuid=%u"},
53 {.token: Opt_dfltgid, .pattern: "dfltgid=%u"},
54 {.token: Opt_afid, .pattern: "afid=%u"},
55 {.token: Opt_uname, .pattern: "uname=%s"},
56 {.token: Opt_remotename, .pattern: "aname=%s"},
57 {.token: Opt_nodevmap, .pattern: "nodevmap"},
58 {.token: Opt_noxattr, .pattern: "noxattr"},
59 {.token: Opt_directio, .pattern: "directio"},
60 {.token: Opt_ignoreqv, .pattern: "ignoreqv"},
61 {.token: Opt_cache, .pattern: "cache=%s"},
62 {.token: Opt_cachetag, .pattern: "cachetag=%s"},
63 {.token: Opt_access, .pattern: "access=%s"},
64 {.token: Opt_posixacl, .pattern: "posixacl"},
65 {.token: Opt_locktimeout, .pattern: "locktimeout=%u"},
66 {.token: Opt_err, NULL}
67};
68
69/* Interpret mount options for cache mode */
70static int get_cache_mode(char *s)
71{
72 int version = -EINVAL;
73
74 if (!strcmp(s, "loose")) {
75 version = CACHE_SC_LOOSE;
76 p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
77 } else if (!strcmp(s, "fscache")) {
78 version = CACHE_SC_FSCACHE;
79 p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
80 } else if (!strcmp(s, "mmap")) {
81 version = CACHE_SC_MMAP;
82 p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
83 } else if (!strcmp(s, "readahead")) {
84 version = CACHE_SC_READAHEAD;
85 p9_debug(P9_DEBUG_9P, "Cache mode: readahead\n");
86 } else if (!strcmp(s, "none")) {
87 version = CACHE_SC_NONE;
88 p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
89 } else if (kstrtoint(s, base: 0, res: &version) != 0) {
90 version = -EINVAL;
91 pr_info("Unknown Cache mode or invalid value %s\n", s);
92 }
93 return version;
94}
95
96/*
97 * Display the mount options in /proc/mounts.
98 */
99int v9fs_show_options(struct seq_file *m, struct dentry *root)
100{
101 struct v9fs_session_info *v9ses = root->d_sb->s_fs_info;
102
103 if (v9ses->debug)
104 seq_printf(m, fmt: ",debug=%x", v9ses->debug);
105 if (!uid_eq(left: v9ses->dfltuid, V9FS_DEFUID))
106 seq_printf(m, fmt: ",dfltuid=%u",
107 from_kuid_munged(to: &init_user_ns, kuid: v9ses->dfltuid));
108 if (!gid_eq(left: v9ses->dfltgid, V9FS_DEFGID))
109 seq_printf(m, fmt: ",dfltgid=%u",
110 from_kgid_munged(to: &init_user_ns, kgid: v9ses->dfltgid));
111 if (v9ses->afid != ~0)
112 seq_printf(m, fmt: ",afid=%u", v9ses->afid);
113 if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0)
114 seq_printf(m, fmt: ",uname=%s", v9ses->uname);
115 if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0)
116 seq_printf(m, fmt: ",aname=%s", v9ses->aname);
117 if (v9ses->nodev)
118 seq_puts(m, s: ",nodevmap");
119 if (v9ses->cache)
120 seq_printf(m, fmt: ",cache=%x", v9ses->cache);
121#ifdef CONFIG_9P_FSCACHE
122 if (v9ses->cachetag && (v9ses->cache & CACHE_FSCACHE))
123 seq_printf(m, ",cachetag=%s", v9ses->cachetag);
124#endif
125
126 switch (v9ses->flags & V9FS_ACCESS_MASK) {
127 case V9FS_ACCESS_USER:
128 seq_puts(m, s: ",access=user");
129 break;
130 case V9FS_ACCESS_ANY:
131 seq_puts(m, s: ",access=any");
132 break;
133 case V9FS_ACCESS_CLIENT:
134 seq_puts(m, s: ",access=client");
135 break;
136 case V9FS_ACCESS_SINGLE:
137 seq_printf(m, fmt: ",access=%u",
138 from_kuid_munged(to: &init_user_ns, kuid: v9ses->uid));
139 break;
140 }
141
142 if (v9ses->flags & V9FS_IGNORE_QV)
143 seq_puts(m, s: ",ignoreqv");
144 if (v9ses->flags & V9FS_DIRECT_IO)
145 seq_puts(m, s: ",directio");
146 if (v9ses->flags & V9FS_POSIX_ACL)
147 seq_puts(m, s: ",posixacl");
148
149 if (v9ses->flags & V9FS_NO_XATTR)
150 seq_puts(m, s: ",noxattr");
151
152 return p9_show_client_options(m, clnt: v9ses->clnt);
153}
154
155/**
156 * v9fs_parse_options - parse mount options into session structure
157 * @v9ses: existing v9fs session information
158 * @opts: The mount option string
159 *
160 * Return 0 upon success, -ERRNO upon failure.
161 */
162
163static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
164{
165 char *options, *tmp_options;
166 substring_t args[MAX_OPT_ARGS];
167 char *p;
168 int option = 0;
169 char *s;
170 int ret = 0;
171
172 /* setup defaults */
173 v9ses->afid = ~0;
174 v9ses->debug = 0;
175 v9ses->cache = CACHE_NONE;
176#ifdef CONFIG_9P_FSCACHE
177 v9ses->cachetag = NULL;
178#endif
179 v9ses->session_lock_timeout = P9_LOCK_TIMEOUT;
180
181 if (!opts)
182 return 0;
183
184 tmp_options = kstrdup(s: opts, GFP_KERNEL);
185 if (!tmp_options) {
186 ret = -ENOMEM;
187 goto fail_option_alloc;
188 }
189 options = tmp_options;
190
191 while ((p = strsep(&options, ",")) != NULL) {
192 int token, r;
193
194 if (!*p)
195 continue;
196
197 token = match_token(p, table: tokens, args);
198 switch (token) {
199 case Opt_debug:
200 r = match_int(&args[0], result: &option);
201 if (r < 0) {
202 p9_debug(P9_DEBUG_ERROR,
203 "integer field, but no integer?\n");
204 ret = r;
205 } else {
206 v9ses->debug = option;
207#ifdef CONFIG_NET_9P_DEBUG
208 p9_debug_level = option;
209#endif
210 }
211 break;
212
213 case Opt_dfltuid:
214 r = match_int(&args[0], result: &option);
215 if (r < 0) {
216 p9_debug(P9_DEBUG_ERROR,
217 "integer field, but no integer?\n");
218 ret = r;
219 continue;
220 }
221 v9ses->dfltuid = make_kuid(from: current_user_ns(), uid: option);
222 if (!uid_valid(uid: v9ses->dfltuid)) {
223 p9_debug(P9_DEBUG_ERROR,
224 "uid field, but not a uid?\n");
225 ret = -EINVAL;
226 }
227 break;
228 case Opt_dfltgid:
229 r = match_int(&args[0], result: &option);
230 if (r < 0) {
231 p9_debug(P9_DEBUG_ERROR,
232 "integer field, but no integer?\n");
233 ret = r;
234 continue;
235 }
236 v9ses->dfltgid = make_kgid(from: current_user_ns(), gid: option);
237 if (!gid_valid(gid: v9ses->dfltgid)) {
238 p9_debug(P9_DEBUG_ERROR,
239 "gid field, but not a gid?\n");
240 ret = -EINVAL;
241 }
242 break;
243 case Opt_afid:
244 r = match_int(&args[0], result: &option);
245 if (r < 0) {
246 p9_debug(P9_DEBUG_ERROR,
247 "integer field, but no integer?\n");
248 ret = r;
249 } else {
250 v9ses->afid = option;
251 }
252 break;
253 case Opt_uname:
254 kfree(objp: v9ses->uname);
255 v9ses->uname = match_strdup(&args[0]);
256 if (!v9ses->uname) {
257 ret = -ENOMEM;
258 goto free_and_return;
259 }
260 break;
261 case Opt_remotename:
262 kfree(objp: v9ses->aname);
263 v9ses->aname = match_strdup(&args[0]);
264 if (!v9ses->aname) {
265 ret = -ENOMEM;
266 goto free_and_return;
267 }
268 break;
269 case Opt_nodevmap:
270 v9ses->nodev = 1;
271 break;
272 case Opt_noxattr:
273 v9ses->flags |= V9FS_NO_XATTR;
274 break;
275 case Opt_directio:
276 v9ses->flags |= V9FS_DIRECT_IO;
277 break;
278 case Opt_ignoreqv:
279 v9ses->flags |= V9FS_IGNORE_QV;
280 break;
281 case Opt_cachetag:
282#ifdef CONFIG_9P_FSCACHE
283 kfree(v9ses->cachetag);
284 v9ses->cachetag = match_strdup(&args[0]);
285 if (!v9ses->cachetag) {
286 ret = -ENOMEM;
287 goto free_and_return;
288 }
289#endif
290 break;
291 case Opt_cache:
292 s = match_strdup(&args[0]);
293 if (!s) {
294 ret = -ENOMEM;
295 p9_debug(P9_DEBUG_ERROR,
296 "problem allocating copy of cache arg\n");
297 goto free_and_return;
298 }
299 r = get_cache_mode(s);
300 if (r < 0)
301 ret = r;
302 else
303 v9ses->cache = r;
304
305 kfree(objp: s);
306 break;
307
308 case Opt_access:
309 s = match_strdup(&args[0]);
310 if (!s) {
311 ret = -ENOMEM;
312 p9_debug(P9_DEBUG_ERROR,
313 "problem allocating copy of access arg\n");
314 goto free_and_return;
315 }
316
317 v9ses->flags &= ~V9FS_ACCESS_MASK;
318 if (strcmp(s, "user") == 0)
319 v9ses->flags |= V9FS_ACCESS_USER;
320 else if (strcmp(s, "any") == 0)
321 v9ses->flags |= V9FS_ACCESS_ANY;
322 else if (strcmp(s, "client") == 0) {
323 v9ses->flags |= V9FS_ACCESS_CLIENT;
324 } else {
325 uid_t uid;
326
327 v9ses->flags |= V9FS_ACCESS_SINGLE;
328 r = kstrtouint(s, base: 10, res: &uid);
329 if (r) {
330 ret = r;
331 pr_info("Unknown access argument %s: %d\n",
332 s, r);
333 kfree(objp: s);
334 continue;
335 }
336 v9ses->uid = make_kuid(from: current_user_ns(), uid);
337 if (!uid_valid(uid: v9ses->uid)) {
338 ret = -EINVAL;
339 pr_info("Unknown uid %s\n", s);
340 }
341 }
342
343 kfree(objp: s);
344 break;
345
346 case Opt_posixacl:
347#ifdef CONFIG_9P_FS_POSIX_ACL
348 v9ses->flags |= V9FS_POSIX_ACL;
349#else
350 p9_debug(P9_DEBUG_ERROR,
351 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
352#endif
353 break;
354
355 case Opt_locktimeout:
356 r = match_int(&args[0], result: &option);
357 if (r < 0) {
358 p9_debug(P9_DEBUG_ERROR,
359 "integer field, but no integer?\n");
360 ret = r;
361 continue;
362 }
363 if (option < 1) {
364 p9_debug(P9_DEBUG_ERROR,
365 "locktimeout must be a greater than zero integer.\n");
366 ret = -EINVAL;
367 continue;
368 }
369 v9ses->session_lock_timeout = (long)option * HZ;
370 break;
371
372 default:
373 continue;
374 }
375 }
376
377free_and_return:
378 kfree(objp: tmp_options);
379fail_option_alloc:
380 return ret;
381}
382
383/**
384 * v9fs_session_init - initialize session
385 * @v9ses: session information structure
386 * @dev_name: device being mounted
387 * @data: options
388 *
389 */
390
391struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
392 const char *dev_name, char *data)
393{
394 struct p9_fid *fid;
395 int rc = -ENOMEM;
396
397 v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
398 if (!v9ses->uname)
399 goto err_names;
400
401 v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
402 if (!v9ses->aname)
403 goto err_names;
404 init_rwsem(&v9ses->rename_sem);
405
406 v9ses->uid = INVALID_UID;
407 v9ses->dfltuid = V9FS_DEFUID;
408 v9ses->dfltgid = V9FS_DEFGID;
409
410 v9ses->clnt = p9_client_create(dev_name, options: data);
411 if (IS_ERR(ptr: v9ses->clnt)) {
412 rc = PTR_ERR(ptr: v9ses->clnt);
413 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
414 goto err_names;
415 }
416
417 v9ses->flags = V9FS_ACCESS_USER;
418
419 if (p9_is_proto_dotl(clnt: v9ses->clnt)) {
420 v9ses->flags = V9FS_ACCESS_CLIENT;
421 v9ses->flags |= V9FS_PROTO_2000L;
422 } else if (p9_is_proto_dotu(clnt: v9ses->clnt)) {
423 v9ses->flags |= V9FS_PROTO_2000U;
424 }
425
426 rc = v9fs_parse_options(v9ses, opts: data);
427 if (rc < 0)
428 goto err_clnt;
429
430 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
431
432 if (!v9fs_proto_dotl(v9ses) &&
433 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
434 /*
435 * We support ACCESS_CLIENT only for dotl.
436 * Fall back to ACCESS_USER
437 */
438 v9ses->flags &= ~V9FS_ACCESS_MASK;
439 v9ses->flags |= V9FS_ACCESS_USER;
440 }
441 /* FIXME: for legacy mode, fall back to V9FS_ACCESS_ANY */
442 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
443 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
444
445 v9ses->flags &= ~V9FS_ACCESS_MASK;
446 v9ses->flags |= V9FS_ACCESS_ANY;
447 v9ses->uid = INVALID_UID;
448 }
449 if (!v9fs_proto_dotl(v9ses) ||
450 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
451 /*
452 * We support ACL checks on client only if the protocol is
453 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
454 */
455 v9ses->flags &= ~V9FS_ACL_MASK;
456 }
457
458 fid = p9_client_attach(clnt: v9ses->clnt, NULL, uname: v9ses->uname, INVALID_UID,
459 aname: v9ses->aname);
460 if (IS_ERR(ptr: fid)) {
461 rc = PTR_ERR(ptr: fid);
462 p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
463 goto err_clnt;
464 }
465
466 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
467 fid->uid = v9ses->uid;
468 else
469 fid->uid = INVALID_UID;
470
471#ifdef CONFIG_9P_FSCACHE
472 /* register the session for caching */
473 if (v9ses->cache & CACHE_FSCACHE) {
474 rc = v9fs_cache_session_get_cookie(v9ses, dev_name);
475 if (rc < 0)
476 goto err_clnt;
477 }
478#endif
479 spin_lock(lock: &v9fs_sessionlist_lock);
480 list_add(new: &v9ses->slist, head: &v9fs_sessionlist);
481 spin_unlock(lock: &v9fs_sessionlist_lock);
482
483 return fid;
484
485err_clnt:
486#ifdef CONFIG_9P_FSCACHE
487 kfree(v9ses->cachetag);
488#endif
489 p9_client_destroy(clnt: v9ses->clnt);
490err_names:
491 kfree(objp: v9ses->uname);
492 kfree(objp: v9ses->aname);
493 return ERR_PTR(error: rc);
494}
495
496/**
497 * v9fs_session_close - shutdown a session
498 * @v9ses: session information structure
499 *
500 */
501
502void v9fs_session_close(struct v9fs_session_info *v9ses)
503{
504 if (v9ses->clnt) {
505 p9_client_destroy(clnt: v9ses->clnt);
506 v9ses->clnt = NULL;
507 }
508
509#ifdef CONFIG_9P_FSCACHE
510 fscache_relinquish_volume(v9fs_session_cache(v9ses), NULL, false);
511 kfree(v9ses->cachetag);
512#endif
513 kfree(objp: v9ses->uname);
514 kfree(objp: v9ses->aname);
515
516 spin_lock(lock: &v9fs_sessionlist_lock);
517 list_del(entry: &v9ses->slist);
518 spin_unlock(lock: &v9fs_sessionlist_lock);
519}
520
521/**
522 * v9fs_session_cancel - terminate a session
523 * @v9ses: session to terminate
524 *
525 * mark transport as disconnected and cancel all pending requests.
526 */
527
528void v9fs_session_cancel(struct v9fs_session_info *v9ses)
529{
530 p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
531 p9_client_disconnect(clnt: v9ses->clnt);
532}
533
534/**
535 * v9fs_session_begin_cancel - Begin terminate of a session
536 * @v9ses: session to terminate
537 *
538 * After this call we don't allow any request other than clunk.
539 */
540
541void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
542{
543 p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
544 p9_client_begin_disconnect(clnt: v9ses->clnt);
545}
546
547static struct kobject *v9fs_kobj;
548
549#ifdef CONFIG_9P_FSCACHE
550/*
551 * List caches associated with a session
552 */
553static ssize_t caches_show(struct kobject *kobj,
554 struct kobj_attribute *attr,
555 char *buf)
556{
557 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
558 struct v9fs_session_info *v9ses;
559
560 spin_lock(&v9fs_sessionlist_lock);
561 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
562 if (v9ses->cachetag) {
563 n = snprintf(buf + count, limit, "%s\n", v9ses->cachetag);
564 if (n < 0) {
565 count = n;
566 break;
567 }
568
569 count += n;
570 limit -= n;
571 }
572 }
573
574 spin_unlock(&v9fs_sessionlist_lock);
575 return count;
576}
577
578static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
579#endif /* CONFIG_9P_FSCACHE */
580
581static struct attribute *v9fs_attrs[] = {
582#ifdef CONFIG_9P_FSCACHE
583 &v9fs_attr_cache.attr,
584#endif
585 NULL,
586};
587
588static const struct attribute_group v9fs_attr_group = {
589 .attrs = v9fs_attrs,
590};
591
592/**
593 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
594 *
595 */
596
597static int __init v9fs_sysfs_init(void)
598{
599 int ret;
600
601 v9fs_kobj = kobject_create_and_add(name: "9p", parent: fs_kobj);
602 if (!v9fs_kobj)
603 return -ENOMEM;
604
605 ret = sysfs_create_group(kobj: v9fs_kobj, grp: &v9fs_attr_group);
606 if (ret) {
607 kobject_put(kobj: v9fs_kobj);
608 return ret;
609 }
610
611 return 0;
612}
613
614/**
615 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
616 *
617 */
618
619static void v9fs_sysfs_cleanup(void)
620{
621 sysfs_remove_group(kobj: v9fs_kobj, grp: &v9fs_attr_group);
622 kobject_put(kobj: v9fs_kobj);
623}
624
625static void v9fs_inode_init_once(void *foo)
626{
627 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
628
629 memset(s: &v9inode->qid, c: 0, n: sizeof(v9inode->qid));
630 inode_init_once(&v9inode->netfs.inode);
631}
632
633/**
634 * v9fs_init_inode_cache - initialize a cache for 9P
635 * Returns 0 on success.
636 */
637static int v9fs_init_inode_cache(void)
638{
639 v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
640 sizeof(struct v9fs_inode),
641 0, (SLAB_RECLAIM_ACCOUNT|
642 SLAB_ACCOUNT),
643 v9fs_inode_init_once);
644 if (!v9fs_inode_cache)
645 return -ENOMEM;
646
647 return 0;
648}
649
650/**
651 * v9fs_destroy_inode_cache - destroy the cache of 9P inode
652 *
653 */
654static void v9fs_destroy_inode_cache(void)
655{
656 /*
657 * Make sure all delayed rcu free inodes are flushed before we
658 * destroy cache.
659 */
660 rcu_barrier();
661 kmem_cache_destroy(s: v9fs_inode_cache);
662}
663
664/**
665 * init_v9fs - Initialize module
666 *
667 */
668
669static int __init init_v9fs(void)
670{
671 int err;
672
673 pr_info("Installing v9fs 9p2000 file system support\n");
674 /* TODO: Setup list of registered transport modules */
675
676 err = v9fs_init_inode_cache();
677 if (err < 0) {
678 pr_err("Failed to register v9fs for caching\n");
679 return err;
680 }
681
682 err = v9fs_sysfs_init();
683 if (err < 0) {
684 pr_err("Failed to register with sysfs\n");
685 goto out_cache;
686 }
687 err = register_filesystem(&v9fs_fs_type);
688 if (err < 0) {
689 pr_err("Failed to register filesystem\n");
690 goto out_sysfs_cleanup;
691 }
692
693 return 0;
694
695out_sysfs_cleanup:
696 v9fs_sysfs_cleanup();
697
698out_cache:
699 v9fs_destroy_inode_cache();
700
701 return err;
702}
703
704/**
705 * exit_v9fs - shutdown module
706 *
707 */
708
709static void __exit exit_v9fs(void)
710{
711 v9fs_sysfs_cleanup();
712 v9fs_destroy_inode_cache();
713 unregister_filesystem(&v9fs_fs_type);
714}
715
716module_init(init_v9fs)
717module_exit(exit_v9fs)
718
719MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
720MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
721MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
722MODULE_DESCRIPTION("9P Client File System");
723MODULE_LICENSE("GPL");
724