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