Commit | Line | Data |
---|---|---|
9e82cf6a EVH |
1 | /* |
2 | * linux/fs/9p/v9fs.c | |
3 | * | |
4 | * This file contains functions assisting in mapping VFS to 9P2000 | |
5 | * | |
8a0dc95f | 6 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
9e82cf6a EVH |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
9e82cf6a EVH |
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 | ||
9e82cf6a EVH |
26 | #include <linux/module.h> |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
914e2637 | 29 | #include <linux/sched.h> |
9e82cf6a EVH |
30 | #include <linux/parser.h> |
31 | #include <linux/idr.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
bd238fb4 | 33 | #include <net/9p/9p.h> |
bd238fb4 | 34 | #include <net/9p/client.h> |
8b81ef58 | 35 | #include <net/9p/transport.h> |
9e82cf6a | 36 | #include "v9fs.h" |
9e82cf6a | 37 | #include "v9fs_vfs.h" |
60e78d2c AK |
38 | #include "cache.h" |
39 | ||
40 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); | |
41 | static LIST_HEAD(v9fs_sessionlist); | |
a78ce05d | 42 | struct kmem_cache *v9fs_inode_cache; |
9e82cf6a EVH |
43 | |
44 | /* | |
60e78d2c AK |
45 | * Option Parsing (code inspired by NFS code) |
46 | * NOTE: each transport will parse its own options | |
47 | */ | |
9e82cf6a EVH |
48 | |
49 | enum { | |
50 | /* Options that take integer arguments */ | |
8a0dc95f | 51 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
9e82cf6a | 52 | /* String options */ |
60e78d2c | 53 | Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag, |
9e82cf6a | 54 | /* Options that take no arguments */ |
8a0dc95f | 55 | Opt_nodevmap, |
e03abc0c | 56 | /* Cache options */ |
60e78d2c | 57 | Opt_cache_loose, Opt_fscache, |
ba17674f | 58 | /* Access options */ |
e782ef71 | 59 | Opt_access, Opt_posixacl, |
9e82cf6a EVH |
60 | /* Error token */ |
61 | Opt_err | |
62 | }; | |
63 | ||
a447c093 | 64 | static const match_table_t tokens = { |
9e2f6688 | 65 | {Opt_debug, "debug=%x"}, |
bd32b82d LI |
66 | {Opt_dfltuid, "dfltuid=%u"}, |
67 | {Opt_dfltgid, "dfltgid=%u"}, | |
9e82cf6a | 68 | {Opt_afid, "afid=%u"}, |
67543e50 | 69 | {Opt_uname, "uname=%s"}, |
9e82cf6a | 70 | {Opt_remotename, "aname=%s"}, |
9e82cf6a | 71 | {Opt_nodevmap, "nodevmap"}, |
60e78d2c | 72 | {Opt_cache, "cache=%s"}, |
e03abc0c | 73 | {Opt_cache_loose, "loose"}, |
60e78d2c AK |
74 | {Opt_fscache, "fscache"}, |
75 | {Opt_cachetag, "cachetag=%s"}, | |
ba17674f | 76 | {Opt_access, "access=%s"}, |
e782ef71 | 77 | {Opt_posixacl, "posixacl"}, |
9e82cf6a EVH |
78 | {Opt_err, NULL} |
79 | }; | |
80 | ||
9e82cf6a EVH |
81 | /** |
82 | * v9fs_parse_options - parse mount options into session structure | |
9e82cf6a EVH |
83 | * @v9ses: existing v9fs session information |
84 | * | |
ab31267d | 85 | * Return 0 upon success, -ERRNO upon failure. |
9e82cf6a EVH |
86 | */ |
87 | ||
4b53e4b5 | 88 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
9e82cf6a | 89 | { |
d8c8a9e3 | 90 | char *options, *tmp_options; |
9e82cf6a | 91 | substring_t args[MAX_OPT_ARGS]; |
a80d923e | 92 | char *p; |
8a0dc95f | 93 | int option = 0; |
ba17674f | 94 | char *s, *e; |
ab31267d | 95 | int ret = 0; |
9e82cf6a EVH |
96 | |
97 | /* setup defaults */ | |
9e82cf6a EVH |
98 | v9ses->afid = ~0; |
99 | v9ses->debug = 0; | |
e03abc0c | 100 | v9ses->cache = 0; |
60e78d2c AK |
101 | #ifdef CONFIG_9P_FSCACHE |
102 | v9ses->cachetag = NULL; | |
103 | #endif | |
9e82cf6a | 104 | |
4b53e4b5 | 105 | if (!opts) |
ab31267d | 106 | return 0; |
9e82cf6a | 107 | |
d8c8a9e3 | 108 | tmp_options = kstrdup(opts, GFP_KERNEL); |
bf2d29c6 EVH |
109 | if (!tmp_options) { |
110 | ret = -ENOMEM; | |
60e78d2c | 111 | goto fail_option_alloc; |
bf2d29c6 | 112 | } |
d8c8a9e3 | 113 | options = tmp_options; |
ab31267d | 114 | |
9e82cf6a EVH |
115 | while ((p = strsep(&options, ",")) != NULL) { |
116 | int token; | |
117 | if (!*p) | |
118 | continue; | |
119 | token = match_token(p, tokens, args); | |
67543e50 | 120 | if (token < Opt_uname) { |
ab31267d JM |
121 | int r = match_int(&args[0], &option); |
122 | if (r < 0) { | |
bd238fb4 | 123 | P9_DPRINTK(P9_DEBUG_ERROR, |
9e82cf6a | 124 | "integer field, but no integer?\n"); |
ab31267d | 125 | ret = r; |
9e82cf6a EVH |
126 | continue; |
127 | } | |
9e82cf6a EVH |
128 | } |
129 | switch (token) { | |
9e2f6688 EVH |
130 | case Opt_debug: |
131 | v9ses->debug = option; | |
10fa16e7 | 132 | #ifdef CONFIG_NET_9P_DEBUG |
9e2f6688 | 133 | p9_debug_level = option; |
10fa16e7 | 134 | #endif |
9e2f6688 | 135 | break; |
8a0dc95f | 136 | |
bd32b82d LI |
137 | case Opt_dfltuid: |
138 | v9ses->dfltuid = option; | |
9e82cf6a | 139 | break; |
bd32b82d LI |
140 | case Opt_dfltgid: |
141 | v9ses->dfltgid = option; | |
9e82cf6a EVH |
142 | break; |
143 | case Opt_afid: | |
144 | v9ses->afid = option; | |
145 | break; | |
67543e50 | 146 | case Opt_uname: |
b32a09db | 147 | match_strlcpy(v9ses->uname, &args[0], PATH_MAX); |
9e82cf6a EVH |
148 | break; |
149 | case Opt_remotename: | |
b32a09db | 150 | match_strlcpy(v9ses->aname, &args[0], PATH_MAX); |
9e82cf6a | 151 | break; |
9e82cf6a EVH |
152 | case Opt_nodevmap: |
153 | v9ses->nodev = 1; | |
154 | break; | |
e03abc0c EVH |
155 | case Opt_cache_loose: |
156 | v9ses->cache = CACHE_LOOSE; | |
157 | break; | |
60e78d2c AK |
158 | case Opt_fscache: |
159 | v9ses->cache = CACHE_FSCACHE; | |
160 | break; | |
161 | case Opt_cachetag: | |
162 | #ifdef CONFIG_9P_FSCACHE | |
163 | v9ses->cachetag = match_strdup(&args[0]); | |
164 | #endif | |
165 | break; | |
166 | case Opt_cache: | |
167 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
168 | if (!s) { |
169 | ret = -ENOMEM; | |
170 | P9_DPRINTK(P9_DEBUG_ERROR, | |
171 | "problem allocating copy of cache arg\n"); | |
172 | goto free_and_return; | |
173 | } | |
60e78d2c AK |
174 | |
175 | if (strcmp(s, "loose") == 0) | |
176 | v9ses->cache = CACHE_LOOSE; | |
177 | else if (strcmp(s, "fscache") == 0) | |
178 | v9ses->cache = CACHE_FSCACHE; | |
179 | else | |
180 | v9ses->cache = CACHE_NONE; | |
181 | kfree(s); | |
182 | break; | |
ba17674f LI |
183 | |
184 | case Opt_access: | |
185 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
186 | if (!s) { |
187 | ret = -ENOMEM; | |
188 | P9_DPRINTK(P9_DEBUG_ERROR, | |
189 | "problem allocating copy of access arg\n"); | |
190 | goto free_and_return; | |
191 | } | |
60e78d2c | 192 | |
ba17674f LI |
193 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
194 | if (strcmp(s, "user") == 0) | |
195 | v9ses->flags |= V9FS_ACCESS_USER; | |
196 | else if (strcmp(s, "any") == 0) | |
197 | v9ses->flags |= V9FS_ACCESS_ANY; | |
76381a42 | 198 | else if (strcmp(s, "client") == 0) { |
76381a42 | 199 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
76381a42 | 200 | } else { |
ba17674f | 201 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
f1d9e458 | 202 | v9ses->uid = simple_strtoul(s, &e, 10); |
ba17674f LI |
203 | if (*e != '\0') |
204 | v9ses->uid = ~0; | |
205 | } | |
0a976297 | 206 | kfree(s); |
ba17674f LI |
207 | break; |
208 | ||
e782ef71 VJJ |
209 | case Opt_posixacl: |
210 | #ifdef CONFIG_9P_FS_POSIX_ACL | |
211 | v9ses->flags |= V9FS_POSIX_ACL; | |
212 | #else | |
213 | P9_DPRINTK(P9_DEBUG_ERROR, | |
214 | "Not defined CONFIG_9P_FS_POSIX_ACL. " | |
215 | "Ignoring posixacl option\n"); | |
216 | #endif | |
217 | break; | |
218 | ||
9e82cf6a EVH |
219 | default: |
220 | continue; | |
221 | } | |
222 | } | |
d8c8a9e3 | 223 | |
bf2d29c6 | 224 | free_and_return: |
d8c8a9e3 | 225 | kfree(tmp_options); |
60e78d2c | 226 | fail_option_alloc: |
bf2d29c6 | 227 | return ret; |
9e82cf6a EVH |
228 | } |
229 | ||
9e82cf6a EVH |
230 | /** |
231 | * v9fs_session_init - initialize session | |
232 | * @v9ses: session information structure | |
233 | * @dev_name: device being mounted | |
234 | * @data: options | |
235 | * | |
236 | */ | |
237 | ||
bd238fb4 | 238 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
239 | const char *dev_name, char *data) |
240 | { | |
9e82cf6a | 241 | int retval = -EINVAL; |
bd238fb4 | 242 | struct p9_fid *fid; |
ab31267d | 243 | int rc; |
9e82cf6a | 244 | |
ba17674f LI |
245 | v9ses->uname = __getname(); |
246 | if (!v9ses->uname) | |
bd238fb4 | 247 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 248 | |
ba17674f LI |
249 | v9ses->aname = __getname(); |
250 | if (!v9ses->aname) { | |
251 | __putname(v9ses->uname); | |
bd238fb4 | 252 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 253 | } |
a534c8d1 | 254 | init_rwsem(&v9ses->rename_sem); |
9e82cf6a | 255 | |
0ed07ddb JA |
256 | rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); |
257 | if (rc) { | |
258 | __putname(v9ses->aname); | |
259 | __putname(v9ses->uname); | |
260 | return ERR_PTR(rc); | |
261 | } | |
262 | ||
60e78d2c AK |
263 | spin_lock(&v9fs_sessionlist_lock); |
264 | list_add(&v9ses->slist, &v9fs_sessionlist); | |
265 | spin_unlock(&v9fs_sessionlist_lock); | |
266 | ||
ba17674f LI |
267 | strcpy(v9ses->uname, V9FS_DEFUSER); |
268 | strcpy(v9ses->aname, V9FS_DEFANAME); | |
269 | v9ses->uid = ~0; | |
bd32b82d LI |
270 | v9ses->dfltuid = V9FS_DEFUID; |
271 | v9ses->dfltgid = V9FS_DEFGID; | |
ab31267d | 272 | |
4b53e4b5 | 273 | v9ses->clnt = p9_client_create(dev_name, data); |
bd238fb4 LI |
274 | if (IS_ERR(v9ses->clnt)) { |
275 | retval = PTR_ERR(v9ses->clnt); | |
276 | v9ses->clnt = NULL; | |
277 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); | |
278 | goto error; | |
9e82cf6a EVH |
279 | } |
280 | ||
6752a1eb VJJ |
281 | v9ses->flags = V9FS_ACCESS_USER; |
282 | ||
283 | if (p9_is_proto_dotl(v9ses->clnt)) { | |
284 | v9ses->flags = V9FS_ACCESS_CLIENT; | |
476ada04 | 285 | v9ses->flags |= V9FS_PROTO_2000L; |
6752a1eb | 286 | } else if (p9_is_proto_dotu(v9ses->clnt)) { |
476ada04 | 287 | v9ses->flags |= V9FS_PROTO_2000U; |
6752a1eb VJJ |
288 | } |
289 | ||
290 | rc = v9fs_parse_options(v9ses, data); | |
291 | if (rc < 0) { | |
292 | retval = rc; | |
293 | goto error; | |
294 | } | |
ba17674f | 295 | |
fbedadc1 | 296 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
8a0dc95f | 297 | |
76381a42 AK |
298 | if (!v9fs_proto_dotl(v9ses) && |
299 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
300 | /* | |
301 | * We support ACCESS_CLIENT only for dotl. | |
302 | * Fall back to ACCESS_USER | |
303 | */ | |
304 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
305 | v9ses->flags |= V9FS_ACCESS_USER; | |
306 | } | |
307 | /*FIXME !! */ | |
ba17674f | 308 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
9ffaf63e | 309 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
ba17674f LI |
310 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
311 | ||
312 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
313 | v9ses->flags |= V9FS_ACCESS_ANY; | |
314 | v9ses->uid = ~0; | |
315 | } | |
e782ef71 VJJ |
316 | if (!v9fs_proto_dotl(v9ses) || |
317 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
318 | /* | |
319 | * We support ACL checks on clinet only if the protocol is | |
320 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. | |
321 | */ | |
322 | v9ses->flags &= ~V9FS_ACL_MASK; | |
323 | } | |
ba17674f LI |
324 | |
325 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, | |
326 | v9ses->aname); | |
bd238fb4 LI |
327 | if (IS_ERR(fid)) { |
328 | retval = PTR_ERR(fid); | |
329 | fid = NULL; | |
330 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); | |
331 | goto error; | |
9e82cf6a EVH |
332 | } |
333 | ||
ba17674f LI |
334 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
335 | fid->uid = v9ses->uid; | |
336 | else | |
337 | fid->uid = ~0; | |
338 | ||
60e78d2c AK |
339 | #ifdef CONFIG_9P_FSCACHE |
340 | /* register the session for caching */ | |
341 | v9fs_cache_session_get_cookie(v9ses); | |
342 | #endif | |
343 | ||
bd238fb4 | 344 | return fid; |
9e82cf6a | 345 | |
bd238fb4 | 346 | error: |
0ed07ddb | 347 | bdi_destroy(&v9ses->bdi); |
bd238fb4 | 348 | return ERR_PTR(retval); |
9e82cf6a EVH |
349 | } |
350 | ||
351 | /** | |
352 | * v9fs_session_close - shutdown a session | |
353 | * @v9ses: session information structure | |
354 | * | |
355 | */ | |
356 | ||
357 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
358 | { | |
bd238fb4 LI |
359 | if (v9ses->clnt) { |
360 | p9_client_destroy(v9ses->clnt); | |
361 | v9ses->clnt = NULL; | |
3cf6429a | 362 | } |
9e82cf6a | 363 | |
60e78d2c AK |
364 | #ifdef CONFIG_9P_FSCACHE |
365 | if (v9ses->fscache) { | |
366 | v9fs_cache_session_put_cookie(v9ses); | |
367 | kfree(v9ses->cachetag); | |
368 | } | |
369 | #endif | |
ba17674f LI |
370 | __putname(v9ses->uname); |
371 | __putname(v9ses->aname); | |
60e78d2c | 372 | |
0ed07ddb JA |
373 | bdi_destroy(&v9ses->bdi); |
374 | ||
60e78d2c AK |
375 | spin_lock(&v9fs_sessionlist_lock); |
376 | list_del(&v9ses->slist); | |
377 | spin_unlock(&v9fs_sessionlist_lock); | |
9e82cf6a EVH |
378 | } |
379 | ||
322b329a | 380 | /** |
ee443996 EVH |
381 | * v9fs_session_cancel - terminate a session |
382 | * @v9ses: session to terminate | |
383 | * | |
384 | * mark transport as disconnected and cancel all pending requests. | |
322b329a | 385 | */ |
ee443996 | 386 | |
322b329a | 387 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
bd238fb4 LI |
388 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
389 | p9_client_disconnect(v9ses->clnt); | |
322b329a EVH |
390 | } |
391 | ||
6d96d3ab AK |
392 | /** |
393 | * v9fs_session_begin_cancel - Begin terminate of a session | |
394 | * @v9ses: session to terminate | |
395 | * | |
396 | * After this call we don't allow any request other than clunk. | |
397 | */ | |
398 | ||
399 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) | |
400 | { | |
401 | P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); | |
402 | p9_client_begin_disconnect(v9ses->clnt); | |
403 | } | |
404 | ||
9e82cf6a EVH |
405 | extern int v9fs_error_init(void); |
406 | ||
60e78d2c AK |
407 | static struct kobject *v9fs_kobj; |
408 | ||
409 | #ifdef CONFIG_9P_FSCACHE | |
9e82cf6a | 410 | /** |
60e78d2c AK |
411 | * caches_show - list caches associated with a session |
412 | * | |
413 | * Returns the size of buffer written. | |
414 | */ | |
415 | ||
416 | static ssize_t caches_show(struct kobject *kobj, | |
417 | struct kobj_attribute *attr, | |
418 | char *buf) | |
419 | { | |
420 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; | |
421 | struct v9fs_session_info *v9ses; | |
422 | ||
423 | spin_lock(&v9fs_sessionlist_lock); | |
424 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { | |
425 | if (v9ses->cachetag) { | |
426 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); | |
427 | if (n < 0) { | |
428 | count = n; | |
429 | break; | |
430 | } | |
431 | ||
432 | count += n; | |
433 | limit -= n; | |
434 | } | |
435 | } | |
436 | ||
437 | spin_unlock(&v9fs_sessionlist_lock); | |
438 | return count; | |
439 | } | |
440 | ||
441 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); | |
442 | #endif /* CONFIG_9P_FSCACHE */ | |
443 | ||
444 | static struct attribute *v9fs_attrs[] = { | |
445 | #ifdef CONFIG_9P_FSCACHE | |
446 | &v9fs_attr_cache.attr, | |
447 | #endif | |
448 | NULL, | |
449 | }; | |
450 | ||
451 | static struct attribute_group v9fs_attr_group = { | |
452 | .attrs = v9fs_attrs, | |
453 | }; | |
454 | ||
455 | /** | |
456 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface | |
457 | * | |
458 | */ | |
459 | ||
460 | static int v9fs_sysfs_init(void) | |
461 | { | |
462 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); | |
463 | if (!v9fs_kobj) | |
464 | return -ENOMEM; | |
465 | ||
466 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { | |
467 | kobject_put(v9fs_kobj); | |
468 | return -ENOMEM; | |
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | /** | |
475 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface | |
476 | * | |
477 | */ | |
478 | ||
479 | static void v9fs_sysfs_cleanup(void) | |
480 | { | |
481 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); | |
482 | kobject_put(v9fs_kobj); | |
483 | } | |
484 | ||
a78ce05d AK |
485 | static void v9fs_inode_init_once(void *foo) |
486 | { | |
487 | struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; | |
488 | #ifdef CONFIG_9P_FSCACHE | |
489 | v9inode->fscache = NULL; | |
490 | v9inode->fscache_key = NULL; | |
491 | #endif | |
492 | inode_init_once(&v9inode->vfs_inode); | |
493 | } | |
494 | ||
495 | /** | |
496 | * v9fs_init_inode_cache - initialize a cache for 9P | |
497 | * Returns 0 on success. | |
498 | */ | |
499 | static int v9fs_init_inode_cache(void) | |
500 | { | |
501 | v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", | |
502 | sizeof(struct v9fs_inode), | |
503 | 0, (SLAB_RECLAIM_ACCOUNT| | |
504 | SLAB_MEM_SPREAD), | |
505 | v9fs_inode_init_once); | |
506 | if (!v9fs_inode_cache) | |
507 | return -ENOMEM; | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | /** | |
513 | * v9fs_destroy_inode_cache - destroy the cache of 9P inode | |
514 | * | |
515 | */ | |
516 | static void v9fs_destroy_inode_cache(void) | |
517 | { | |
518 | kmem_cache_destroy(v9fs_inode_cache); | |
519 | } | |
520 | ||
521 | static int v9fs_cache_register(void) | |
522 | { | |
523 | int ret; | |
524 | ret = v9fs_init_inode_cache(); | |
525 | if (ret < 0) | |
526 | return ret; | |
527 | #ifdef CONFIG_9P_FSCACHE | |
528 | return fscache_register_netfs(&v9fs_cache_netfs); | |
529 | #else | |
530 | return ret; | |
531 | #endif | |
532 | } | |
533 | ||
534 | static void v9fs_cache_unregister(void) | |
535 | { | |
536 | v9fs_destroy_inode_cache(); | |
537 | #ifdef CONFIG_9P_FSCACHE | |
538 | fscache_unregister_netfs(&v9fs_cache_netfs); | |
539 | #endif | |
540 | } | |
541 | ||
60e78d2c AK |
542 | /** |
543 | * init_v9fs - Initialize module | |
9e82cf6a EVH |
544 | * |
545 | */ | |
546 | ||
547 | static int __init init_v9fs(void) | |
548 | { | |
60e78d2c | 549 | int err; |
f94b3470 | 550 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
a80d923e | 551 | /* TODO: Setup list of registered trasnport modules */ |
60e78d2c AK |
552 | err = register_filesystem(&v9fs_fs_type); |
553 | if (err < 0) { | |
554 | printk(KERN_ERR "Failed to register filesystem\n"); | |
555 | return err; | |
556 | } | |
557 | ||
558 | err = v9fs_cache_register(); | |
559 | if (err < 0) { | |
560 | printk(KERN_ERR "Failed to register v9fs for caching\n"); | |
561 | goto out_fs_unreg; | |
562 | } | |
563 | ||
564 | err = v9fs_sysfs_init(); | |
565 | if (err < 0) { | |
566 | printk(KERN_ERR "Failed to register with sysfs\n"); | |
567 | goto out_sysfs_cleanup; | |
568 | } | |
569 | ||
570 | return 0; | |
571 | ||
572 | out_sysfs_cleanup: | |
573 | v9fs_sysfs_cleanup(); | |
574 | ||
575 | out_fs_unreg: | |
576 | unregister_filesystem(&v9fs_fs_type); | |
577 | ||
578 | return err; | |
9e82cf6a EVH |
579 | } |
580 | ||
581 | /** | |
60e78d2c | 582 | * exit_v9fs - shutdown module |
9e82cf6a EVH |
583 | * |
584 | */ | |
585 | ||
586 | static void __exit exit_v9fs(void) | |
587 | { | |
60e78d2c AK |
588 | v9fs_sysfs_cleanup(); |
589 | v9fs_cache_unregister(); | |
9e82cf6a EVH |
590 | unregister_filesystem(&v9fs_fs_type); |
591 | } | |
592 | ||
593 | module_init(init_v9fs) | |
594 | module_exit(exit_v9fs) | |
595 | ||
bd238fb4 | 596 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
597 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
598 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
599 | MODULE_LICENSE("GPL"); |