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Commit | Line | Data |
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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 | ||
a2dd43bb PK |
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_DPRINTK(P9_DEBUG_9P, "Cache mode: loose\n"); | |
89 | } else if (!strcmp(s, "fscache")) { | |
90 | version = CACHE_FSCACHE; | |
91 | P9_DPRINTK(P9_DEBUG_9P, "Cache mode: fscache\n"); | |
92 | } else if (!strcmp(s, "none")) { | |
93 | version = CACHE_NONE; | |
94 | P9_DPRINTK(P9_DEBUG_9P, "Cache mode: none\n"); | |
95 | } else | |
96 | printk(KERN_INFO "9p: Unknown Cache mode %s.\n", s); | |
97 | return version; | |
98 | } | |
99 | ||
9e82cf6a EVH |
100 | /** |
101 | * v9fs_parse_options - parse mount options into session structure | |
9e82cf6a EVH |
102 | * @v9ses: existing v9fs session information |
103 | * | |
ab31267d | 104 | * Return 0 upon success, -ERRNO upon failure. |
9e82cf6a EVH |
105 | */ |
106 | ||
4b53e4b5 | 107 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
9e82cf6a | 108 | { |
d8c8a9e3 | 109 | char *options, *tmp_options; |
9e82cf6a | 110 | substring_t args[MAX_OPT_ARGS]; |
a80d923e | 111 | char *p; |
8a0dc95f | 112 | int option = 0; |
ba17674f | 113 | char *s, *e; |
ab31267d | 114 | int ret = 0; |
9e82cf6a EVH |
115 | |
116 | /* setup defaults */ | |
9e82cf6a EVH |
117 | v9ses->afid = ~0; |
118 | v9ses->debug = 0; | |
a2dd43bb | 119 | v9ses->cache = CACHE_NONE; |
60e78d2c AK |
120 | #ifdef CONFIG_9P_FSCACHE |
121 | v9ses->cachetag = NULL; | |
122 | #endif | |
9e82cf6a | 123 | |
4b53e4b5 | 124 | if (!opts) |
ab31267d | 125 | return 0; |
9e82cf6a | 126 | |
d8c8a9e3 | 127 | tmp_options = kstrdup(opts, GFP_KERNEL); |
bf2d29c6 EVH |
128 | if (!tmp_options) { |
129 | ret = -ENOMEM; | |
60e78d2c | 130 | goto fail_option_alloc; |
bf2d29c6 | 131 | } |
d8c8a9e3 | 132 | options = tmp_options; |
ab31267d | 133 | |
9e82cf6a EVH |
134 | while ((p = strsep(&options, ",")) != NULL) { |
135 | int token; | |
136 | if (!*p) | |
137 | continue; | |
138 | token = match_token(p, tokens, args); | |
67543e50 | 139 | if (token < Opt_uname) { |
ab31267d JM |
140 | int r = match_int(&args[0], &option); |
141 | if (r < 0) { | |
bd238fb4 | 142 | P9_DPRINTK(P9_DEBUG_ERROR, |
9e82cf6a | 143 | "integer field, but no integer?\n"); |
ab31267d | 144 | ret = r; |
9e82cf6a EVH |
145 | continue; |
146 | } | |
9e82cf6a EVH |
147 | } |
148 | switch (token) { | |
9e2f6688 EVH |
149 | case Opt_debug: |
150 | v9ses->debug = option; | |
10fa16e7 | 151 | #ifdef CONFIG_NET_9P_DEBUG |
9e2f6688 | 152 | p9_debug_level = option; |
10fa16e7 | 153 | #endif |
9e2f6688 | 154 | break; |
8a0dc95f | 155 | |
bd32b82d LI |
156 | case Opt_dfltuid: |
157 | v9ses->dfltuid = option; | |
9e82cf6a | 158 | break; |
bd32b82d LI |
159 | case Opt_dfltgid: |
160 | v9ses->dfltgid = option; | |
9e82cf6a EVH |
161 | break; |
162 | case Opt_afid: | |
163 | v9ses->afid = option; | |
164 | break; | |
67543e50 | 165 | case Opt_uname: |
b32a09db | 166 | match_strlcpy(v9ses->uname, &args[0], PATH_MAX); |
9e82cf6a EVH |
167 | break; |
168 | case Opt_remotename: | |
b32a09db | 169 | match_strlcpy(v9ses->aname, &args[0], PATH_MAX); |
9e82cf6a | 170 | break; |
9e82cf6a EVH |
171 | case Opt_nodevmap: |
172 | v9ses->nodev = 1; | |
173 | break; | |
e03abc0c EVH |
174 | case Opt_cache_loose: |
175 | v9ses->cache = CACHE_LOOSE; | |
176 | break; | |
60e78d2c AK |
177 | case Opt_fscache: |
178 | v9ses->cache = CACHE_FSCACHE; | |
179 | break; | |
180 | case Opt_cachetag: | |
181 | #ifdef CONFIG_9P_FSCACHE | |
182 | v9ses->cachetag = match_strdup(&args[0]); | |
183 | #endif | |
184 | break; | |
185 | case Opt_cache: | |
186 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
187 | if (!s) { |
188 | ret = -ENOMEM; | |
189 | P9_DPRINTK(P9_DEBUG_ERROR, | |
190 | "problem allocating copy of cache arg\n"); | |
191 | goto free_and_return; | |
192 | } | |
a2dd43bb PK |
193 | ret = get_cache_mode(s); |
194 | if (ret == -EINVAL) { | |
195 | kfree(s); | |
196 | goto free_and_return; | |
197 | } | |
60e78d2c | 198 | |
a2dd43bb | 199 | v9ses->cache = ret; |
60e78d2c AK |
200 | kfree(s); |
201 | break; | |
ba17674f LI |
202 | |
203 | case Opt_access: | |
204 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
205 | if (!s) { |
206 | ret = -ENOMEM; | |
207 | P9_DPRINTK(P9_DEBUG_ERROR, | |
208 | "problem allocating copy of access arg\n"); | |
209 | goto free_and_return; | |
210 | } | |
60e78d2c | 211 | |
ba17674f LI |
212 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
213 | if (strcmp(s, "user") == 0) | |
214 | v9ses->flags |= V9FS_ACCESS_USER; | |
215 | else if (strcmp(s, "any") == 0) | |
216 | v9ses->flags |= V9FS_ACCESS_ANY; | |
76381a42 | 217 | else if (strcmp(s, "client") == 0) { |
76381a42 | 218 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
76381a42 | 219 | } else { |
ba17674f | 220 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
f1d9e458 | 221 | v9ses->uid = simple_strtoul(s, &e, 10); |
a2dd43bb PK |
222 | if (*e != '\0') { |
223 | ret = -EINVAL; | |
224 | printk(KERN_INFO "9p: Unknown access " | |
225 | "argument %s.\n", s); | |
226 | kfree(s); | |
227 | goto free_and_return; | |
228 | } | |
ba17674f | 229 | } |
a2dd43bb | 230 | |
0a976297 | 231 | kfree(s); |
ba17674f LI |
232 | break; |
233 | ||
e782ef71 VJJ |
234 | case Opt_posixacl: |
235 | #ifdef CONFIG_9P_FS_POSIX_ACL | |
236 | v9ses->flags |= V9FS_POSIX_ACL; | |
237 | #else | |
238 | P9_DPRINTK(P9_DEBUG_ERROR, | |
239 | "Not defined CONFIG_9P_FS_POSIX_ACL. " | |
240 | "Ignoring posixacl option\n"); | |
241 | #endif | |
242 | break; | |
243 | ||
9e82cf6a EVH |
244 | default: |
245 | continue; | |
246 | } | |
247 | } | |
d8c8a9e3 | 248 | |
bf2d29c6 | 249 | free_and_return: |
d8c8a9e3 | 250 | kfree(tmp_options); |
60e78d2c | 251 | fail_option_alloc: |
bf2d29c6 | 252 | return ret; |
9e82cf6a EVH |
253 | } |
254 | ||
9e82cf6a EVH |
255 | /** |
256 | * v9fs_session_init - initialize session | |
257 | * @v9ses: session information structure | |
258 | * @dev_name: device being mounted | |
259 | * @data: options | |
260 | * | |
261 | */ | |
262 | ||
bd238fb4 | 263 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
264 | const char *dev_name, char *data) |
265 | { | |
9e82cf6a | 266 | int retval = -EINVAL; |
bd238fb4 | 267 | struct p9_fid *fid; |
ab31267d | 268 | int rc; |
9e82cf6a | 269 | |
ba17674f LI |
270 | v9ses->uname = __getname(); |
271 | if (!v9ses->uname) | |
bd238fb4 | 272 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 273 | |
ba17674f LI |
274 | v9ses->aname = __getname(); |
275 | if (!v9ses->aname) { | |
276 | __putname(v9ses->uname); | |
bd238fb4 | 277 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 278 | } |
a534c8d1 | 279 | init_rwsem(&v9ses->rename_sem); |
9e82cf6a | 280 | |
0ed07ddb JA |
281 | rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); |
282 | if (rc) { | |
283 | __putname(v9ses->aname); | |
284 | __putname(v9ses->uname); | |
285 | return ERR_PTR(rc); | |
286 | } | |
287 | ||
60e78d2c AK |
288 | spin_lock(&v9fs_sessionlist_lock); |
289 | list_add(&v9ses->slist, &v9fs_sessionlist); | |
290 | spin_unlock(&v9fs_sessionlist_lock); | |
291 | ||
ba17674f LI |
292 | strcpy(v9ses->uname, V9FS_DEFUSER); |
293 | strcpy(v9ses->aname, V9FS_DEFANAME); | |
294 | v9ses->uid = ~0; | |
bd32b82d LI |
295 | v9ses->dfltuid = V9FS_DEFUID; |
296 | v9ses->dfltgid = V9FS_DEFGID; | |
ab31267d | 297 | |
4b53e4b5 | 298 | v9ses->clnt = p9_client_create(dev_name, data); |
bd238fb4 LI |
299 | if (IS_ERR(v9ses->clnt)) { |
300 | retval = PTR_ERR(v9ses->clnt); | |
301 | v9ses->clnt = NULL; | |
302 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); | |
303 | goto error; | |
9e82cf6a EVH |
304 | } |
305 | ||
6752a1eb VJJ |
306 | v9ses->flags = V9FS_ACCESS_USER; |
307 | ||
308 | if (p9_is_proto_dotl(v9ses->clnt)) { | |
309 | v9ses->flags = V9FS_ACCESS_CLIENT; | |
476ada04 | 310 | v9ses->flags |= V9FS_PROTO_2000L; |
6752a1eb | 311 | } else if (p9_is_proto_dotu(v9ses->clnt)) { |
476ada04 | 312 | v9ses->flags |= V9FS_PROTO_2000U; |
6752a1eb VJJ |
313 | } |
314 | ||
315 | rc = v9fs_parse_options(v9ses, data); | |
316 | if (rc < 0) { | |
317 | retval = rc; | |
318 | goto error; | |
319 | } | |
ba17674f | 320 | |
fbedadc1 | 321 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
8a0dc95f | 322 | |
76381a42 AK |
323 | if (!v9fs_proto_dotl(v9ses) && |
324 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
325 | /* | |
326 | * We support ACCESS_CLIENT only for dotl. | |
327 | * Fall back to ACCESS_USER | |
328 | */ | |
329 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
330 | v9ses->flags |= V9FS_ACCESS_USER; | |
331 | } | |
332 | /*FIXME !! */ | |
ba17674f | 333 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
9ffaf63e | 334 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
ba17674f LI |
335 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
336 | ||
337 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
338 | v9ses->flags |= V9FS_ACCESS_ANY; | |
339 | v9ses->uid = ~0; | |
340 | } | |
e782ef71 VJJ |
341 | if (!v9fs_proto_dotl(v9ses) || |
342 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
343 | /* | |
344 | * We support ACL checks on clinet only if the protocol is | |
345 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. | |
346 | */ | |
347 | v9ses->flags &= ~V9FS_ACL_MASK; | |
348 | } | |
ba17674f LI |
349 | |
350 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, | |
351 | v9ses->aname); | |
bd238fb4 LI |
352 | if (IS_ERR(fid)) { |
353 | retval = PTR_ERR(fid); | |
354 | fid = NULL; | |
355 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); | |
356 | goto error; | |
9e82cf6a EVH |
357 | } |
358 | ||
ba17674f LI |
359 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
360 | fid->uid = v9ses->uid; | |
361 | else | |
362 | fid->uid = ~0; | |
363 | ||
60e78d2c AK |
364 | #ifdef CONFIG_9P_FSCACHE |
365 | /* register the session for caching */ | |
366 | v9fs_cache_session_get_cookie(v9ses); | |
367 | #endif | |
368 | ||
bd238fb4 | 369 | return fid; |
9e82cf6a | 370 | |
bd238fb4 | 371 | error: |
0ed07ddb | 372 | bdi_destroy(&v9ses->bdi); |
bd238fb4 | 373 | return ERR_PTR(retval); |
9e82cf6a EVH |
374 | } |
375 | ||
376 | /** | |
377 | * v9fs_session_close - shutdown a session | |
378 | * @v9ses: session information structure | |
379 | * | |
380 | */ | |
381 | ||
382 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
383 | { | |
bd238fb4 LI |
384 | if (v9ses->clnt) { |
385 | p9_client_destroy(v9ses->clnt); | |
386 | v9ses->clnt = NULL; | |
3cf6429a | 387 | } |
9e82cf6a | 388 | |
60e78d2c AK |
389 | #ifdef CONFIG_9P_FSCACHE |
390 | if (v9ses->fscache) { | |
391 | v9fs_cache_session_put_cookie(v9ses); | |
392 | kfree(v9ses->cachetag); | |
393 | } | |
394 | #endif | |
ba17674f LI |
395 | __putname(v9ses->uname); |
396 | __putname(v9ses->aname); | |
60e78d2c | 397 | |
0ed07ddb JA |
398 | bdi_destroy(&v9ses->bdi); |
399 | ||
60e78d2c AK |
400 | spin_lock(&v9fs_sessionlist_lock); |
401 | list_del(&v9ses->slist); | |
402 | spin_unlock(&v9fs_sessionlist_lock); | |
9e82cf6a EVH |
403 | } |
404 | ||
322b329a | 405 | /** |
ee443996 EVH |
406 | * v9fs_session_cancel - terminate a session |
407 | * @v9ses: session to terminate | |
408 | * | |
409 | * mark transport as disconnected and cancel all pending requests. | |
322b329a | 410 | */ |
ee443996 | 411 | |
322b329a | 412 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
bd238fb4 LI |
413 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
414 | p9_client_disconnect(v9ses->clnt); | |
322b329a EVH |
415 | } |
416 | ||
6d96d3ab AK |
417 | /** |
418 | * v9fs_session_begin_cancel - Begin terminate of a session | |
419 | * @v9ses: session to terminate | |
420 | * | |
421 | * After this call we don't allow any request other than clunk. | |
422 | */ | |
423 | ||
424 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) | |
425 | { | |
426 | P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); | |
427 | p9_client_begin_disconnect(v9ses->clnt); | |
428 | } | |
429 | ||
9e82cf6a EVH |
430 | extern int v9fs_error_init(void); |
431 | ||
60e78d2c AK |
432 | static struct kobject *v9fs_kobj; |
433 | ||
434 | #ifdef CONFIG_9P_FSCACHE | |
9e82cf6a | 435 | /** |
60e78d2c AK |
436 | * caches_show - list caches associated with a session |
437 | * | |
438 | * Returns the size of buffer written. | |
439 | */ | |
440 | ||
441 | static ssize_t caches_show(struct kobject *kobj, | |
442 | struct kobj_attribute *attr, | |
443 | char *buf) | |
444 | { | |
445 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; | |
446 | struct v9fs_session_info *v9ses; | |
447 | ||
448 | spin_lock(&v9fs_sessionlist_lock); | |
449 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { | |
450 | if (v9ses->cachetag) { | |
451 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); | |
452 | if (n < 0) { | |
453 | count = n; | |
454 | break; | |
455 | } | |
456 | ||
457 | count += n; | |
458 | limit -= n; | |
459 | } | |
460 | } | |
461 | ||
462 | spin_unlock(&v9fs_sessionlist_lock); | |
463 | return count; | |
464 | } | |
465 | ||
466 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); | |
467 | #endif /* CONFIG_9P_FSCACHE */ | |
468 | ||
469 | static struct attribute *v9fs_attrs[] = { | |
470 | #ifdef CONFIG_9P_FSCACHE | |
471 | &v9fs_attr_cache.attr, | |
472 | #endif | |
473 | NULL, | |
474 | }; | |
475 | ||
476 | static struct attribute_group v9fs_attr_group = { | |
477 | .attrs = v9fs_attrs, | |
478 | }; | |
479 | ||
480 | /** | |
481 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface | |
482 | * | |
483 | */ | |
484 | ||
485 | static int v9fs_sysfs_init(void) | |
486 | { | |
487 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); | |
488 | if (!v9fs_kobj) | |
489 | return -ENOMEM; | |
490 | ||
491 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { | |
492 | kobject_put(v9fs_kobj); | |
493 | return -ENOMEM; | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | /** | |
500 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface | |
501 | * | |
502 | */ | |
503 | ||
504 | static void v9fs_sysfs_cleanup(void) | |
505 | { | |
506 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); | |
507 | kobject_put(v9fs_kobj); | |
508 | } | |
509 | ||
a78ce05d AK |
510 | static void v9fs_inode_init_once(void *foo) |
511 | { | |
512 | struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; | |
513 | #ifdef CONFIG_9P_FSCACHE | |
514 | v9inode->fscache = NULL; | |
a78ce05d | 515 | #endif |
fd2421f5 | 516 | memset(&v9inode->qid, 0, sizeof(v9inode->qid)); |
a78ce05d AK |
517 | inode_init_once(&v9inode->vfs_inode); |
518 | } | |
519 | ||
520 | /** | |
521 | * v9fs_init_inode_cache - initialize a cache for 9P | |
522 | * Returns 0 on success. | |
523 | */ | |
524 | static int v9fs_init_inode_cache(void) | |
525 | { | |
526 | v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", | |
527 | sizeof(struct v9fs_inode), | |
528 | 0, (SLAB_RECLAIM_ACCOUNT| | |
529 | SLAB_MEM_SPREAD), | |
530 | v9fs_inode_init_once); | |
531 | if (!v9fs_inode_cache) | |
532 | return -ENOMEM; | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | /** | |
538 | * v9fs_destroy_inode_cache - destroy the cache of 9P inode | |
539 | * | |
540 | */ | |
541 | static void v9fs_destroy_inode_cache(void) | |
542 | { | |
543 | kmem_cache_destroy(v9fs_inode_cache); | |
544 | } | |
545 | ||
546 | static int v9fs_cache_register(void) | |
547 | { | |
548 | int ret; | |
549 | ret = v9fs_init_inode_cache(); | |
550 | if (ret < 0) | |
551 | return ret; | |
552 | #ifdef CONFIG_9P_FSCACHE | |
553 | return fscache_register_netfs(&v9fs_cache_netfs); | |
554 | #else | |
555 | return ret; | |
556 | #endif | |
557 | } | |
558 | ||
559 | static void v9fs_cache_unregister(void) | |
560 | { | |
561 | v9fs_destroy_inode_cache(); | |
562 | #ifdef CONFIG_9P_FSCACHE | |
563 | fscache_unregister_netfs(&v9fs_cache_netfs); | |
564 | #endif | |
565 | } | |
566 | ||
60e78d2c AK |
567 | /** |
568 | * init_v9fs - Initialize module | |
9e82cf6a EVH |
569 | * |
570 | */ | |
571 | ||
572 | static int __init init_v9fs(void) | |
573 | { | |
60e78d2c | 574 | int err; |
f94b3470 | 575 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
a80d923e | 576 | /* TODO: Setup list of registered trasnport modules */ |
60e78d2c AK |
577 | err = register_filesystem(&v9fs_fs_type); |
578 | if (err < 0) { | |
579 | printk(KERN_ERR "Failed to register filesystem\n"); | |
580 | return err; | |
581 | } | |
582 | ||
583 | err = v9fs_cache_register(); | |
584 | if (err < 0) { | |
585 | printk(KERN_ERR "Failed to register v9fs for caching\n"); | |
586 | goto out_fs_unreg; | |
587 | } | |
588 | ||
589 | err = v9fs_sysfs_init(); | |
590 | if (err < 0) { | |
591 | printk(KERN_ERR "Failed to register with sysfs\n"); | |
592 | goto out_sysfs_cleanup; | |
593 | } | |
594 | ||
595 | return 0; | |
596 | ||
597 | out_sysfs_cleanup: | |
598 | v9fs_sysfs_cleanup(); | |
599 | ||
600 | out_fs_unreg: | |
601 | unregister_filesystem(&v9fs_fs_type); | |
602 | ||
603 | return err; | |
9e82cf6a EVH |
604 | } |
605 | ||
606 | /** | |
60e78d2c | 607 | * exit_v9fs - shutdown module |
9e82cf6a EVH |
608 | * |
609 | */ | |
610 | ||
611 | static void __exit exit_v9fs(void) | |
612 | { | |
60e78d2c AK |
613 | v9fs_sysfs_cleanup(); |
614 | v9fs_cache_unregister(); | |
9e82cf6a EVH |
615 | unregister_filesystem(&v9fs_fs_type); |
616 | } | |
617 | ||
618 | module_init(init_v9fs) | |
619 | module_exit(exit_v9fs) | |
620 | ||
bd238fb4 | 621 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
622 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
623 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
624 | MODULE_LICENSE("GPL"); |