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
26 static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
27 static LIST_HEAD(v9fs_sessionlist);
28 struct 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
35 enum {
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,
42 /* Cache options */
43 Opt_cache_loose, Opt_fscache, Opt_mmap,
44 /* Access options */
45 Opt_access, Opt_posixacl,
46 /* Lock timeout option */
47 Opt_locktimeout,
48 /* Error token */
49 Opt_err
50 };
51
52 static const match_table_t tokens = {
53 {Opt_debug, "debug=%x"},
54 {Opt_dfltuid, "dfltuid=%u"},
55 {Opt_dfltgid, "dfltgid=%u"},
56 {Opt_afid, "afid=%u"},
57 {Opt_uname, "uname=%s"},
58 {Opt_remotename, "aname=%s"},
59 {Opt_nodevmap, "nodevmap"},
60 {Opt_cache, "cache=%s"},
61 {Opt_cache_loose, "loose"},
62 {Opt_fscache, "fscache"},
63 {Opt_mmap, "mmap"},
64 {Opt_cachetag, "cachetag=%s"},
65 {Opt_access, "access=%s"},
66 {Opt_posixacl, "posixacl"},
67 {Opt_locktimeout, "locktimeout=%u"},
68 {Opt_err, NULL}
69 };
70
71 static const char *const v9fs_cache_modes[nr__p9_cache_modes] = {
72 [CACHE_NONE] = "none",
73 [CACHE_MMAP] = "mmap",
74 [CACHE_LOOSE] = "loose",
75 [CACHE_FSCACHE] = "fscache",
76 };
77
78 /* Interpret mount options for cache mode */
get_cache_mode(char * s)79 static int get_cache_mode(char *s)
80 {
81 int version = -EINVAL;
82
83 if (!strcmp(s, "loose")) {
84 version = CACHE_LOOSE;
85 p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
86 } else if (!strcmp(s, "fscache")) {
87 version = CACHE_FSCACHE;
88 p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
89 } else if (!strcmp(s, "mmap")) {
90 version = CACHE_MMAP;
91 p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
92 } else if (!strcmp(s, "none")) {
93 version = CACHE_NONE;
94 p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
95 } else
96 pr_info("Unknown Cache mode %s\n", s);
97 return version;
98 }
99
100 /*
101 * Display the mount options in /proc/mounts.
102 */
v9fs_show_options(struct seq_file * m,struct dentry * root)103 int v9fs_show_options(struct seq_file *m, struct dentry *root)
104 {
105 struct v9fs_session_info *v9ses = root->d_sb->s_fs_info;
106
107 if (v9ses->debug)
108 seq_printf(m, ",debug=%x", v9ses->debug);
109 if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID))
110 seq_printf(m, ",dfltuid=%u",
111 from_kuid_munged(&init_user_ns, v9ses->dfltuid));
112 if (!gid_eq(v9ses->dfltgid, V9FS_DEFGID))
113 seq_printf(m, ",dfltgid=%u",
114 from_kgid_munged(&init_user_ns, v9ses->dfltgid));
115 if (v9ses->afid != ~0)
116 seq_printf(m, ",afid=%u", v9ses->afid);
117 if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0)
118 seq_printf(m, ",uname=%s", v9ses->uname);
119 if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0)
120 seq_printf(m, ",aname=%s", v9ses->aname);
121 if (v9ses->nodev)
122 seq_puts(m, ",nodevmap");
123 if (v9ses->cache)
124 seq_printf(m, ",%s", v9fs_cache_modes[v9ses->cache]);
125 #ifdef CONFIG_9P_FSCACHE
126 if (v9ses->cachetag && v9ses->cache == CACHE_FSCACHE)
127 seq_printf(m, ",cachetag=%s", v9ses->cachetag);
128 #endif
129
130 switch (v9ses->flags & V9FS_ACCESS_MASK) {
131 case V9FS_ACCESS_USER:
132 seq_puts(m, ",access=user");
133 break;
134 case V9FS_ACCESS_ANY:
135 seq_puts(m, ",access=any");
136 break;
137 case V9FS_ACCESS_CLIENT:
138 seq_puts(m, ",access=client");
139 break;
140 case V9FS_ACCESS_SINGLE:
141 seq_printf(m, ",access=%u",
142 from_kuid_munged(&init_user_ns, v9ses->uid));
143 break;
144 }
145
146 if (v9ses->flags & V9FS_POSIX_ACL)
147 seq_puts(m, ",posixacl");
148
149 return p9_show_client_options(m, v9ses->clnt);
150 }
151
152 /**
153 * v9fs_parse_options - parse mount options into session structure
154 * @v9ses: existing v9fs session information
155 * @opts: The mount option string
156 *
157 * Return 0 upon success, -ERRNO upon failure.
158 */
159
v9fs_parse_options(struct v9fs_session_info * v9ses,char * opts)160 static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
161 {
162 char *options, *tmp_options;
163 substring_t args[MAX_OPT_ARGS];
164 char *p;
165 int option = 0;
166 char *s;
167 int ret = 0;
168
169 /* setup defaults */
170 v9ses->afid = ~0;
171 v9ses->debug = 0;
172 v9ses->cache = CACHE_NONE;
173 #ifdef CONFIG_9P_FSCACHE
174 v9ses->cachetag = NULL;
175 #endif
176 v9ses->session_lock_timeout = P9_LOCK_TIMEOUT;
177
178 if (!opts)
179 return 0;
180
181 tmp_options = kstrdup(opts, GFP_KERNEL);
182 if (!tmp_options) {
183 ret = -ENOMEM;
184 goto fail_option_alloc;
185 }
186 options = tmp_options;
187
188 while ((p = strsep(&options, ",")) != NULL) {
189 int token, r;
190
191 if (!*p)
192 continue;
193
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
324 v9ses->flags |= V9FS_ACCESS_SINGLE;
325 r = kstrtouint(s, 10, &uid);
326 if (r) {
327 ret = r;
328 pr_info("Unknown access argument %s: %d\n",
329 s, r);
330 kfree(s);
331 continue;
332 }
333 v9ses->uid = make_kuid(current_user_ns(), uid);
334 if (!uid_valid(v9ses->uid)) {
335 ret = -EINVAL;
336 pr_info("Unknown uid %s\n", s);
337 }
338 }
339
340 kfree(s);
341 break;
342
343 case Opt_posixacl:
344 #ifdef CONFIG_9P_FS_POSIX_ACL
345 v9ses->flags |= V9FS_POSIX_ACL;
346 #else
347 p9_debug(P9_DEBUG_ERROR,
348 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
349 #endif
350 break;
351
352 case Opt_locktimeout:
353 r = match_int(&args[0], &option);
354 if (r < 0) {
355 p9_debug(P9_DEBUG_ERROR,
356 "integer field, but no integer?\n");
357 ret = r;
358 continue;
359 }
360 if (option < 1) {
361 p9_debug(P9_DEBUG_ERROR,
362 "locktimeout must be a greater than zero integer.\n");
363 ret = -EINVAL;
364 continue;
365 }
366 v9ses->session_lock_timeout = (long)option * HZ;
367 break;
368
369 default:
370 continue;
371 }
372 }
373
374 free_and_return:
375 kfree(tmp_options);
376 fail_option_alloc:
377 return ret;
378 }
379
380 /**
381 * v9fs_session_init - initialize session
382 * @v9ses: session information structure
383 * @dev_name: device being mounted
384 * @data: options
385 *
386 */
387
v9fs_session_init(struct v9fs_session_info * v9ses,const char * dev_name,char * data)388 struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
389 const char *dev_name, char *data)
390 {
391 struct p9_fid *fid;
392 int rc = -ENOMEM;
393
394 v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
395 if (!v9ses->uname)
396 goto err_names;
397
398 v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
399 if (!v9ses->aname)
400 goto err_names;
401 init_rwsem(&v9ses->rename_sem);
402
403 v9ses->uid = INVALID_UID;
404 v9ses->dfltuid = V9FS_DEFUID;
405 v9ses->dfltgid = V9FS_DEFGID;
406
407 v9ses->clnt = p9_client_create(dev_name, data);
408 if (IS_ERR(v9ses->clnt)) {
409 rc = PTR_ERR(v9ses->clnt);
410 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
411 goto err_names;
412 }
413
414 v9ses->flags = V9FS_ACCESS_USER;
415
416 if (p9_is_proto_dotl(v9ses->clnt)) {
417 v9ses->flags = V9FS_ACCESS_CLIENT;
418 v9ses->flags |= V9FS_PROTO_2000L;
419 } else if (p9_is_proto_dotu(v9ses->clnt)) {
420 v9ses->flags |= V9FS_PROTO_2000U;
421 }
422
423 rc = v9fs_parse_options(v9ses, data);
424 if (rc < 0)
425 goto err_clnt;
426
427 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
428
429 if (!v9fs_proto_dotl(v9ses) &&
430 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
431 /*
432 * We support ACCESS_CLIENT only for dotl.
433 * Fall back to ACCESS_USER
434 */
435 v9ses->flags &= ~V9FS_ACCESS_MASK;
436 v9ses->flags |= V9FS_ACCESS_USER;
437 }
438 /*FIXME !! */
439 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
440 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
441 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
442
443 v9ses->flags &= ~V9FS_ACCESS_MASK;
444 v9ses->flags |= V9FS_ACCESS_ANY;
445 v9ses->uid = INVALID_UID;
446 }
447 if (!v9fs_proto_dotl(v9ses) ||
448 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
449 /*
450 * We support ACL checks on clinet only if the protocol is
451 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
452 */
453 v9ses->flags &= ~V9FS_ACL_MASK;
454 }
455
456 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
457 v9ses->aname);
458 if (IS_ERR(fid)) {
459 rc = PTR_ERR(fid);
460 p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
461 goto err_clnt;
462 }
463
464 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
465 fid->uid = v9ses->uid;
466 else
467 fid->uid = INVALID_UID;
468
469 #ifdef CONFIG_9P_FSCACHE
470 /* register the session for caching */
471 if (v9ses->cache == CACHE_FSCACHE) {
472 rc = v9fs_cache_session_get_cookie(v9ses, dev_name);
473 if (rc < 0)
474 goto err_clnt;
475 }
476 #endif
477 spin_lock(&v9fs_sessionlist_lock);
478 list_add(&v9ses->slist, &v9fs_sessionlist);
479 spin_unlock(&v9fs_sessionlist_lock);
480
481 return fid;
482
483 err_clnt:
484 #ifdef CONFIG_9P_FSCACHE
485 kfree(v9ses->cachetag);
486 #endif
487 p9_client_destroy(v9ses->clnt);
488 err_names:
489 kfree(v9ses->uname);
490 kfree(v9ses->aname);
491 return ERR_PTR(rc);
492 }
493
494 /**
495 * v9fs_session_close - shutdown a session
496 * @v9ses: session information structure
497 *
498 */
499
v9fs_session_close(struct v9fs_session_info * v9ses)500 void v9fs_session_close(struct v9fs_session_info *v9ses)
501 {
502 if (v9ses->clnt) {
503 p9_client_destroy(v9ses->clnt);
504 v9ses->clnt = NULL;
505 }
506
507 #ifdef CONFIG_9P_FSCACHE
508 fscache_relinquish_volume(v9fs_session_cache(v9ses), NULL, false);
509 kfree(v9ses->cachetag);
510 #endif
511 kfree(v9ses->uname);
512 kfree(v9ses->aname);
513
514 spin_lock(&v9fs_sessionlist_lock);
515 list_del(&v9ses->slist);
516 spin_unlock(&v9fs_sessionlist_lock);
517 }
518
519 /**
520 * v9fs_session_cancel - terminate a session
521 * @v9ses: session to terminate
522 *
523 * mark transport as disconnected and cancel all pending requests.
524 */
525
v9fs_session_cancel(struct v9fs_session_info * v9ses)526 void v9fs_session_cancel(struct v9fs_session_info *v9ses)
527 {
528 p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
529 p9_client_disconnect(v9ses->clnt);
530 }
531
532 /**
533 * v9fs_session_begin_cancel - Begin terminate of a session
534 * @v9ses: session to terminate
535 *
536 * After this call we don't allow any request other than clunk.
537 */
538
v9fs_session_begin_cancel(struct v9fs_session_info * v9ses)539 void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
540 {
541 p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
542 p9_client_begin_disconnect(v9ses->clnt);
543 }
544
545 extern int v9fs_error_init(void);
546
547 static struct kobject *v9fs_kobj;
548
549 #ifdef CONFIG_9P_FSCACHE
550 /*
551 * List caches associated with a session
552 */
caches_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)553 static 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, 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
578 static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
579 #endif /* CONFIG_9P_FSCACHE */
580
581 static struct attribute *v9fs_attrs[] = {
582 #ifdef CONFIG_9P_FSCACHE
583 &v9fs_attr_cache.attr,
584 #endif
585 NULL,
586 };
587
588 static 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
v9fs_sysfs_init(void)597 static int __init v9fs_sysfs_init(void)
598 {
599 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
600 if (!v9fs_kobj)
601 return -ENOMEM;
602
603 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
604 kobject_put(v9fs_kobj);
605 return -ENOMEM;
606 }
607
608 return 0;
609 }
610
611 /**
612 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
613 *
614 */
615
v9fs_sysfs_cleanup(void)616 static void v9fs_sysfs_cleanup(void)
617 {
618 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
619 kobject_put(v9fs_kobj);
620 }
621
v9fs_inode_init_once(void * foo)622 static void v9fs_inode_init_once(void *foo)
623 {
624 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
625
626 memset(&v9inode->qid, 0, sizeof(v9inode->qid));
627 inode_init_once(&v9inode->netfs.inode);
628 }
629
630 /**
631 * v9fs_init_inode_cache - initialize a cache for 9P
632 * Returns 0 on success.
633 */
v9fs_init_inode_cache(void)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 */
v9fs_destroy_inode_cache(void)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
v9fs_cache_register(void)661 static int v9fs_cache_register(void)
662 {
663 int ret;
664
665 ret = v9fs_init_inode_cache();
666 if (ret < 0)
667 return ret;
668 return ret;
669 }
670
v9fs_cache_unregister(void)671 static void v9fs_cache_unregister(void)
672 {
673 v9fs_destroy_inode_cache();
674 }
675
676 /**
677 * init_v9fs - Initialize module
678 *
679 */
680
init_v9fs(void)681 static int __init init_v9fs(void)
682 {
683 int err;
684
685 pr_info("Installing v9fs 9p2000 file system support\n");
686 /* TODO: Setup list of registered trasnport modules */
687
688 err = v9fs_cache_register();
689 if (err < 0) {
690 pr_err("Failed to register v9fs for caching\n");
691 return err;
692 }
693
694 err = v9fs_sysfs_init();
695 if (err < 0) {
696 pr_err("Failed to register with sysfs\n");
697 goto out_cache;
698 }
699 err = register_filesystem(&v9fs_fs_type);
700 if (err < 0) {
701 pr_err("Failed to register filesystem\n");
702 goto out_sysfs_cleanup;
703 }
704
705 return 0;
706
707 out_sysfs_cleanup:
708 v9fs_sysfs_cleanup();
709
710 out_cache:
711 v9fs_cache_unregister();
712
713 return err;
714 }
715
716 /**
717 * exit_v9fs - shutdown module
718 *
719 */
720
exit_v9fs(void)721 static void __exit exit_v9fs(void)
722 {
723 v9fs_sysfs_cleanup();
724 v9fs_cache_unregister();
725 unregister_filesystem(&v9fs_fs_type);
726 }
727
728 module_init(init_v9fs)
729 module_exit(exit_v9fs)
730
731 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
732 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
733 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
734 MODULE_LICENSE("GPL");
735