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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 | ||
5d385153 JP |
26 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
27 | ||
9e82cf6a EVH |
28 | #include <linux/module.h> |
29 | #include <linux/errno.h> | |
30 | #include <linux/fs.h> | |
914e2637 | 31 | #include <linux/sched.h> |
5b825c3a | 32 | #include <linux/cred.h> |
9e82cf6a EVH |
33 | #include <linux/parser.h> |
34 | #include <linux/idr.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
bd238fb4 | 36 | #include <net/9p/9p.h> |
bd238fb4 | 37 | #include <net/9p/client.h> |
8b81ef58 | 38 | #include <net/9p/transport.h> |
9e82cf6a | 39 | #include "v9fs.h" |
9e82cf6a | 40 | #include "v9fs_vfs.h" |
60e78d2c AK |
41 | #include "cache.h" |
42 | ||
43 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); | |
44 | static LIST_HEAD(v9fs_sessionlist); | |
a78ce05d | 45 | struct kmem_cache *v9fs_inode_cache; |
9e82cf6a EVH |
46 | |
47 | /* | |
60e78d2c AK |
48 | * Option Parsing (code inspired by NFS code) |
49 | * NOTE: each transport will parse its own options | |
50 | */ | |
9e82cf6a EVH |
51 | |
52 | enum { | |
53 | /* Options that take integer arguments */ | |
8a0dc95f | 54 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
9e82cf6a | 55 | /* String options */ |
cb9af418 | 56 | Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag, |
9e82cf6a | 57 | /* Options that take no arguments */ |
8a0dc95f | 58 | Opt_nodevmap, |
e03abc0c | 59 | /* Cache options */ |
fb89b45c | 60 | Opt_cache_loose, Opt_fscache, Opt_mmap, |
ba17674f | 61 | /* Access options */ |
e782ef71 | 62 | Opt_access, Opt_posixacl, |
9e82cf6a EVH |
63 | /* Error token */ |
64 | Opt_err | |
65 | }; | |
66 | ||
a447c093 | 67 | static const match_table_t tokens = { |
9e2f6688 | 68 | {Opt_debug, "debug=%x"}, |
bd32b82d LI |
69 | {Opt_dfltuid, "dfltuid=%u"}, |
70 | {Opt_dfltgid, "dfltgid=%u"}, | |
9e82cf6a | 71 | {Opt_afid, "afid=%u"}, |
67543e50 | 72 | {Opt_uname, "uname=%s"}, |
9e82cf6a | 73 | {Opt_remotename, "aname=%s"}, |
9e82cf6a | 74 | {Opt_nodevmap, "nodevmap"}, |
60e78d2c | 75 | {Opt_cache, "cache=%s"}, |
e03abc0c | 76 | {Opt_cache_loose, "loose"}, |
60e78d2c | 77 | {Opt_fscache, "fscache"}, |
fb89b45c | 78 | {Opt_mmap, "mmap"}, |
60e78d2c | 79 | {Opt_cachetag, "cachetag=%s"}, |
ba17674f | 80 | {Opt_access, "access=%s"}, |
e782ef71 | 81 | {Opt_posixacl, "posixacl"}, |
9e82cf6a EVH |
82 | {Opt_err, NULL} |
83 | }; | |
84 | ||
a2dd43bb PK |
85 | /* Interpret mount options for cache mode */ |
86 | static int get_cache_mode(char *s) | |
87 | { | |
88 | int version = -EINVAL; | |
89 | ||
90 | if (!strcmp(s, "loose")) { | |
91 | version = CACHE_LOOSE; | |
5d385153 | 92 | p9_debug(P9_DEBUG_9P, "Cache mode: loose\n"); |
a2dd43bb PK |
93 | } else if (!strcmp(s, "fscache")) { |
94 | version = CACHE_FSCACHE; | |
5d385153 | 95 | p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n"); |
fb89b45c DM |
96 | } else if (!strcmp(s, "mmap")) { |
97 | version = CACHE_MMAP; | |
98 | p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n"); | |
a2dd43bb PK |
99 | } else if (!strcmp(s, "none")) { |
100 | version = CACHE_NONE; | |
5d385153 | 101 | p9_debug(P9_DEBUG_9P, "Cache mode: none\n"); |
a2dd43bb | 102 | } else |
5d385153 | 103 | pr_info("Unknown Cache mode %s\n", s); |
a2dd43bb PK |
104 | return version; |
105 | } | |
106 | ||
9e82cf6a EVH |
107 | /** |
108 | * v9fs_parse_options - parse mount options into session structure | |
9e82cf6a EVH |
109 | * @v9ses: existing v9fs session information |
110 | * | |
ab31267d | 111 | * Return 0 upon success, -ERRNO upon failure. |
9e82cf6a EVH |
112 | */ |
113 | ||
4b53e4b5 | 114 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
9e82cf6a | 115 | { |
d8c8a9e3 | 116 | char *options, *tmp_options; |
9e82cf6a | 117 | substring_t args[MAX_OPT_ARGS]; |
a80d923e | 118 | char *p; |
8a0dc95f | 119 | int option = 0; |
ba17674f | 120 | char *s, *e; |
ab31267d | 121 | int ret = 0; |
9e82cf6a EVH |
122 | |
123 | /* setup defaults */ | |
9e82cf6a EVH |
124 | v9ses->afid = ~0; |
125 | v9ses->debug = 0; | |
a2dd43bb | 126 | v9ses->cache = CACHE_NONE; |
60e78d2c AK |
127 | #ifdef CONFIG_9P_FSCACHE |
128 | v9ses->cachetag = NULL; | |
129 | #endif | |
9e82cf6a | 130 | |
4b53e4b5 | 131 | if (!opts) |
ab31267d | 132 | return 0; |
9e82cf6a | 133 | |
d8c8a9e3 | 134 | tmp_options = kstrdup(opts, GFP_KERNEL); |
bf2d29c6 EVH |
135 | if (!tmp_options) { |
136 | ret = -ENOMEM; | |
60e78d2c | 137 | goto fail_option_alloc; |
bf2d29c6 | 138 | } |
d8c8a9e3 | 139 | options = tmp_options; |
ab31267d | 140 | |
9e82cf6a | 141 | while ((p = strsep(&options, ",")) != NULL) { |
4d5077f1 | 142 | int token, r; |
9e82cf6a EVH |
143 | if (!*p) |
144 | continue; | |
145 | token = match_token(p, tokens, args); | |
4d5077f1 AK |
146 | switch (token) { |
147 | case Opt_debug: | |
148 | r = match_int(&args[0], &option); | |
ab31267d | 149 | if (r < 0) { |
5d385153 JP |
150 | p9_debug(P9_DEBUG_ERROR, |
151 | "integer field, but no integer?\n"); | |
ab31267d | 152 | ret = r; |
9e82cf6a EVH |
153 | continue; |
154 | } | |
9e2f6688 | 155 | v9ses->debug = option; |
10fa16e7 | 156 | #ifdef CONFIG_NET_9P_DEBUG |
9e2f6688 | 157 | p9_debug_level = option; |
10fa16e7 | 158 | #endif |
9e2f6688 | 159 | break; |
8a0dc95f | 160 | |
bd32b82d | 161 | case Opt_dfltuid: |
4d5077f1 AK |
162 | r = match_int(&args[0], &option); |
163 | if (r < 0) { | |
5d385153 JP |
164 | p9_debug(P9_DEBUG_ERROR, |
165 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
166 | ret = r; |
167 | continue; | |
168 | } | |
76ed23a5 EB |
169 | v9ses->dfltuid = make_kuid(current_user_ns(), option); |
170 | if (!uid_valid(v9ses->dfltuid)) { | |
171 | p9_debug(P9_DEBUG_ERROR, | |
172 | "uid field, but not a uid?\n"); | |
173 | ret = -EINVAL; | |
174 | continue; | |
175 | } | |
9e82cf6a | 176 | break; |
bd32b82d | 177 | case Opt_dfltgid: |
4d5077f1 AK |
178 | r = match_int(&args[0], &option); |
179 | if (r < 0) { | |
5d385153 JP |
180 | p9_debug(P9_DEBUG_ERROR, |
181 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
182 | ret = r; |
183 | continue; | |
184 | } | |
76ed23a5 EB |
185 | v9ses->dfltgid = make_kgid(current_user_ns(), option); |
186 | if (!gid_valid(v9ses->dfltgid)) { | |
187 | p9_debug(P9_DEBUG_ERROR, | |
188 | "gid field, but not a gid?\n"); | |
189 | ret = -EINVAL; | |
190 | continue; | |
191 | } | |
9e82cf6a EVH |
192 | break; |
193 | case Opt_afid: | |
4d5077f1 AK |
194 | r = match_int(&args[0], &option); |
195 | if (r < 0) { | |
5d385153 JP |
196 | p9_debug(P9_DEBUG_ERROR, |
197 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
198 | ret = r; |
199 | continue; | |
200 | } | |
9e82cf6a EVH |
201 | v9ses->afid = option; |
202 | break; | |
67543e50 | 203 | case Opt_uname: |
e549c133 JL |
204 | kfree(v9ses->uname); |
205 | v9ses->uname = match_strdup(&args[0]); | |
206 | if (!v9ses->uname) { | |
207 | ret = -ENOMEM; | |
208 | goto free_and_return; | |
209 | } | |
9e82cf6a EVH |
210 | break; |
211 | case Opt_remotename: | |
e549c133 JL |
212 | kfree(v9ses->aname); |
213 | v9ses->aname = match_strdup(&args[0]); | |
214 | if (!v9ses->aname) { | |
215 | ret = -ENOMEM; | |
216 | goto free_and_return; | |
217 | } | |
9e82cf6a | 218 | break; |
9e82cf6a EVH |
219 | case Opt_nodevmap: |
220 | v9ses->nodev = 1; | |
221 | break; | |
e03abc0c EVH |
222 | case Opt_cache_loose: |
223 | v9ses->cache = CACHE_LOOSE; | |
224 | break; | |
60e78d2c AK |
225 | case Opt_fscache: |
226 | v9ses->cache = CACHE_FSCACHE; | |
227 | break; | |
fb89b45c DM |
228 | case Opt_mmap: |
229 | v9ses->cache = CACHE_MMAP; | |
230 | break; | |
60e78d2c AK |
231 | case Opt_cachetag: |
232 | #ifdef CONFIG_9P_FSCACHE | |
233 | v9ses->cachetag = match_strdup(&args[0]); | |
234 | #endif | |
235 | break; | |
236 | case Opt_cache: | |
237 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
238 | if (!s) { |
239 | ret = -ENOMEM; | |
5d385153 JP |
240 | p9_debug(P9_DEBUG_ERROR, |
241 | "problem allocating copy of cache arg\n"); | |
bf2d29c6 EVH |
242 | goto free_and_return; |
243 | } | |
a2dd43bb PK |
244 | ret = get_cache_mode(s); |
245 | if (ret == -EINVAL) { | |
246 | kfree(s); | |
247 | goto free_and_return; | |
248 | } | |
60e78d2c | 249 | |
a2dd43bb | 250 | v9ses->cache = ret; |
60e78d2c AK |
251 | kfree(s); |
252 | break; | |
ba17674f LI |
253 | |
254 | case Opt_access: | |
255 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
256 | if (!s) { |
257 | ret = -ENOMEM; | |
5d385153 JP |
258 | p9_debug(P9_DEBUG_ERROR, |
259 | "problem allocating copy of access arg\n"); | |
bf2d29c6 EVH |
260 | goto free_and_return; |
261 | } | |
60e78d2c | 262 | |
ba17674f LI |
263 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
264 | if (strcmp(s, "user") == 0) | |
265 | v9ses->flags |= V9FS_ACCESS_USER; | |
266 | else if (strcmp(s, "any") == 0) | |
267 | v9ses->flags |= V9FS_ACCESS_ANY; | |
76381a42 | 268 | else if (strcmp(s, "client") == 0) { |
76381a42 | 269 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
76381a42 | 270 | } else { |
76ed23a5 | 271 | uid_t uid; |
ba17674f | 272 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
76ed23a5 | 273 | uid = simple_strtoul(s, &e, 10); |
a2dd43bb PK |
274 | if (*e != '\0') { |
275 | ret = -EINVAL; | |
5d385153 JP |
276 | pr_info("Unknown access argument %s\n", |
277 | s); | |
a2dd43bb PK |
278 | kfree(s); |
279 | goto free_and_return; | |
280 | } | |
76ed23a5 EB |
281 | v9ses->uid = make_kuid(current_user_ns(), uid); |
282 | if (!uid_valid(v9ses->uid)) { | |
283 | ret = -EINVAL; | |
284 | pr_info("Uknown uid %s\n", s); | |
285 | kfree(s); | |
286 | goto free_and_return; | |
287 | } | |
ba17674f | 288 | } |
a2dd43bb | 289 | |
0a976297 | 290 | kfree(s); |
ba17674f LI |
291 | break; |
292 | ||
e782ef71 VJJ |
293 | case Opt_posixacl: |
294 | #ifdef CONFIG_9P_FS_POSIX_ACL | |
295 | v9ses->flags |= V9FS_POSIX_ACL; | |
296 | #else | |
5d385153 JP |
297 | p9_debug(P9_DEBUG_ERROR, |
298 | "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n"); | |
e782ef71 VJJ |
299 | #endif |
300 | break; | |
301 | ||
9e82cf6a EVH |
302 | default: |
303 | continue; | |
304 | } | |
305 | } | |
d8c8a9e3 | 306 | |
bf2d29c6 | 307 | free_and_return: |
d8c8a9e3 | 308 | kfree(tmp_options); |
60e78d2c | 309 | fail_option_alloc: |
bf2d29c6 | 310 | return ret; |
9e82cf6a EVH |
311 | } |
312 | ||
9e82cf6a EVH |
313 | /** |
314 | * v9fs_session_init - initialize session | |
315 | * @v9ses: session information structure | |
316 | * @dev_name: device being mounted | |
317 | * @data: options | |
318 | * | |
319 | */ | |
320 | ||
bd238fb4 | 321 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
322 | const char *dev_name, char *data) |
323 | { | |
bd238fb4 | 324 | struct p9_fid *fid; |
412a19b6 | 325 | int rc = -ENOMEM; |
9e82cf6a | 326 | |
e549c133 | 327 | v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL); |
ba17674f | 328 | if (!v9ses->uname) |
412a19b6 | 329 | goto err_names; |
9e82cf6a | 330 | |
e549c133 | 331 | v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL); |
412a19b6 TH |
332 | if (!v9ses->aname) |
333 | goto err_names; | |
a534c8d1 | 334 | init_rwsem(&v9ses->rename_sem); |
9e82cf6a | 335 | |
76ed23a5 | 336 | v9ses->uid = INVALID_UID; |
bd32b82d LI |
337 | v9ses->dfltuid = V9FS_DEFUID; |
338 | v9ses->dfltgid = V9FS_DEFGID; | |
ab31267d | 339 | |
4b53e4b5 | 340 | v9ses->clnt = p9_client_create(dev_name, data); |
bd238fb4 | 341 | if (IS_ERR(v9ses->clnt)) { |
412a19b6 | 342 | rc = PTR_ERR(v9ses->clnt); |
5d385153 | 343 | p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
71304feb | 344 | goto err_names; |
9e82cf6a EVH |
345 | } |
346 | ||
6752a1eb VJJ |
347 | v9ses->flags = V9FS_ACCESS_USER; |
348 | ||
349 | if (p9_is_proto_dotl(v9ses->clnt)) { | |
350 | v9ses->flags = V9FS_ACCESS_CLIENT; | |
476ada04 | 351 | v9ses->flags |= V9FS_PROTO_2000L; |
6752a1eb | 352 | } else if (p9_is_proto_dotu(v9ses->clnt)) { |
476ada04 | 353 | v9ses->flags |= V9FS_PROTO_2000U; |
6752a1eb VJJ |
354 | } |
355 | ||
356 | rc = v9fs_parse_options(v9ses, data); | |
412a19b6 TH |
357 | if (rc < 0) |
358 | goto err_clnt; | |
ba17674f | 359 | |
fbedadc1 | 360 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
8a0dc95f | 361 | |
76381a42 AK |
362 | if (!v9fs_proto_dotl(v9ses) && |
363 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
364 | /* | |
365 | * We support ACCESS_CLIENT only for dotl. | |
366 | * Fall back to ACCESS_USER | |
367 | */ | |
368 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
369 | v9ses->flags |= V9FS_ACCESS_USER; | |
370 | } | |
371 | /*FIXME !! */ | |
ba17674f | 372 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
9ffaf63e | 373 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
ba17674f LI |
374 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
375 | ||
376 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
377 | v9ses->flags |= V9FS_ACCESS_ANY; | |
76ed23a5 | 378 | v9ses->uid = INVALID_UID; |
ba17674f | 379 | } |
e782ef71 VJJ |
380 | if (!v9fs_proto_dotl(v9ses) || |
381 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
382 | /* | |
383 | * We support ACL checks on clinet only if the protocol is | |
384 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. | |
385 | */ | |
386 | v9ses->flags &= ~V9FS_ACL_MASK; | |
387 | } | |
ba17674f | 388 | |
f791f7c5 | 389 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID, |
ba17674f | 390 | v9ses->aname); |
bd238fb4 | 391 | if (IS_ERR(fid)) { |
412a19b6 | 392 | rc = PTR_ERR(fid); |
5d385153 | 393 | p9_debug(P9_DEBUG_ERROR, "cannot attach\n"); |
412a19b6 | 394 | goto err_clnt; |
9e82cf6a EVH |
395 | } |
396 | ||
ba17674f LI |
397 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
398 | fid->uid = v9ses->uid; | |
399 | else | |
b4642556 | 400 | fid->uid = INVALID_UID; |
ba17674f | 401 | |
60e78d2c AK |
402 | #ifdef CONFIG_9P_FSCACHE |
403 | /* register the session for caching */ | |
404 | v9fs_cache_session_get_cookie(v9ses); | |
405 | #endif | |
412a19b6 TH |
406 | spin_lock(&v9fs_sessionlist_lock); |
407 | list_add(&v9ses->slist, &v9fs_sessionlist); | |
408 | spin_unlock(&v9fs_sessionlist_lock); | |
60e78d2c | 409 | |
bd238fb4 | 410 | return fid; |
9e82cf6a | 411 | |
412a19b6 TH |
412 | err_clnt: |
413 | p9_client_destroy(v9ses->clnt); | |
412a19b6 TH |
414 | err_names: |
415 | kfree(v9ses->uname); | |
416 | kfree(v9ses->aname); | |
417 | return ERR_PTR(rc); | |
9e82cf6a EVH |
418 | } |
419 | ||
420 | /** | |
421 | * v9fs_session_close - shutdown a session | |
422 | * @v9ses: session information structure | |
423 | * | |
424 | */ | |
425 | ||
426 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
427 | { | |
bd238fb4 LI |
428 | if (v9ses->clnt) { |
429 | p9_client_destroy(v9ses->clnt); | |
430 | v9ses->clnt = NULL; | |
3cf6429a | 431 | } |
9e82cf6a | 432 | |
60e78d2c AK |
433 | #ifdef CONFIG_9P_FSCACHE |
434 | if (v9ses->fscache) { | |
435 | v9fs_cache_session_put_cookie(v9ses); | |
436 | kfree(v9ses->cachetag); | |
437 | } | |
438 | #endif | |
e549c133 JL |
439 | kfree(v9ses->uname); |
440 | kfree(v9ses->aname); | |
60e78d2c AK |
441 | |
442 | spin_lock(&v9fs_sessionlist_lock); | |
443 | list_del(&v9ses->slist); | |
444 | spin_unlock(&v9fs_sessionlist_lock); | |
9e82cf6a EVH |
445 | } |
446 | ||
322b329a | 447 | /** |
ee443996 EVH |
448 | * v9fs_session_cancel - terminate a session |
449 | * @v9ses: session to terminate | |
450 | * | |
451 | * mark transport as disconnected and cancel all pending requests. | |
322b329a | 452 | */ |
ee443996 | 453 | |
322b329a | 454 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
5d385153 | 455 | p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
bd238fb4 | 456 | p9_client_disconnect(v9ses->clnt); |
322b329a EVH |
457 | } |
458 | ||
6d96d3ab AK |
459 | /** |
460 | * v9fs_session_begin_cancel - Begin terminate of a session | |
461 | * @v9ses: session to terminate | |
462 | * | |
463 | * After this call we don't allow any request other than clunk. | |
464 | */ | |
465 | ||
466 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) | |
467 | { | |
5d385153 | 468 | p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); |
6d96d3ab AK |
469 | p9_client_begin_disconnect(v9ses->clnt); |
470 | } | |
471 | ||
9e82cf6a EVH |
472 | extern int v9fs_error_init(void); |
473 | ||
60e78d2c AK |
474 | static struct kobject *v9fs_kobj; |
475 | ||
476 | #ifdef CONFIG_9P_FSCACHE | |
9e82cf6a | 477 | /** |
60e78d2c AK |
478 | * caches_show - list caches associated with a session |
479 | * | |
480 | * Returns the size of buffer written. | |
481 | */ | |
482 | ||
483 | static ssize_t caches_show(struct kobject *kobj, | |
484 | struct kobj_attribute *attr, | |
485 | char *buf) | |
486 | { | |
487 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; | |
488 | struct v9fs_session_info *v9ses; | |
489 | ||
490 | spin_lock(&v9fs_sessionlist_lock); | |
491 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { | |
492 | if (v9ses->cachetag) { | |
493 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); | |
494 | if (n < 0) { | |
495 | count = n; | |
496 | break; | |
497 | } | |
498 | ||
499 | count += n; | |
500 | limit -= n; | |
501 | } | |
502 | } | |
503 | ||
504 | spin_unlock(&v9fs_sessionlist_lock); | |
505 | return count; | |
506 | } | |
507 | ||
508 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); | |
509 | #endif /* CONFIG_9P_FSCACHE */ | |
510 | ||
511 | static struct attribute *v9fs_attrs[] = { | |
512 | #ifdef CONFIG_9P_FSCACHE | |
513 | &v9fs_attr_cache.attr, | |
514 | #endif | |
515 | NULL, | |
516 | }; | |
517 | ||
518 | static struct attribute_group v9fs_attr_group = { | |
519 | .attrs = v9fs_attrs, | |
520 | }; | |
521 | ||
522 | /** | |
523 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface | |
524 | * | |
525 | */ | |
526 | ||
bdbeacde | 527 | static int __init v9fs_sysfs_init(void) |
60e78d2c AK |
528 | { |
529 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); | |
530 | if (!v9fs_kobj) | |
531 | return -ENOMEM; | |
532 | ||
533 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { | |
534 | kobject_put(v9fs_kobj); | |
535 | return -ENOMEM; | |
536 | } | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | /** | |
542 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface | |
543 | * | |
544 | */ | |
545 | ||
546 | static void v9fs_sysfs_cleanup(void) | |
547 | { | |
548 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); | |
549 | kobject_put(v9fs_kobj); | |
550 | } | |
551 | ||
a78ce05d AK |
552 | static void v9fs_inode_init_once(void *foo) |
553 | { | |
554 | struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; | |
555 | #ifdef CONFIG_9P_FSCACHE | |
556 | v9inode->fscache = NULL; | |
a78ce05d | 557 | #endif |
fd2421f5 | 558 | memset(&v9inode->qid, 0, sizeof(v9inode->qid)); |
a78ce05d AK |
559 | inode_init_once(&v9inode->vfs_inode); |
560 | } | |
561 | ||
562 | /** | |
563 | * v9fs_init_inode_cache - initialize a cache for 9P | |
564 | * Returns 0 on success. | |
565 | */ | |
566 | static int v9fs_init_inode_cache(void) | |
567 | { | |
568 | v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", | |
569 | sizeof(struct v9fs_inode), | |
570 | 0, (SLAB_RECLAIM_ACCOUNT| | |
5d097056 | 571 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
a78ce05d AK |
572 | v9fs_inode_init_once); |
573 | if (!v9fs_inode_cache) | |
574 | return -ENOMEM; | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | /** | |
580 | * v9fs_destroy_inode_cache - destroy the cache of 9P inode | |
581 | * | |
582 | */ | |
583 | static void v9fs_destroy_inode_cache(void) | |
584 | { | |
8c0a8537 KS |
585 | /* |
586 | * Make sure all delayed rcu free inodes are flushed before we | |
587 | * destroy cache. | |
588 | */ | |
589 | rcu_barrier(); | |
a78ce05d AK |
590 | kmem_cache_destroy(v9fs_inode_cache); |
591 | } | |
592 | ||
593 | static int v9fs_cache_register(void) | |
594 | { | |
595 | int ret; | |
596 | ret = v9fs_init_inode_cache(); | |
597 | if (ret < 0) | |
598 | return ret; | |
599 | #ifdef CONFIG_9P_FSCACHE | |
8061a6fa AV |
600 | ret = fscache_register_netfs(&v9fs_cache_netfs); |
601 | if (ret < 0) | |
602 | v9fs_destroy_inode_cache(); | |
a78ce05d | 603 | #endif |
8061a6fa | 604 | return ret; |
a78ce05d AK |
605 | } |
606 | ||
607 | static void v9fs_cache_unregister(void) | |
608 | { | |
609 | v9fs_destroy_inode_cache(); | |
610 | #ifdef CONFIG_9P_FSCACHE | |
611 | fscache_unregister_netfs(&v9fs_cache_netfs); | |
612 | #endif | |
613 | } | |
614 | ||
60e78d2c AK |
615 | /** |
616 | * init_v9fs - Initialize module | |
9e82cf6a EVH |
617 | * |
618 | */ | |
619 | ||
620 | static int __init init_v9fs(void) | |
621 | { | |
60e78d2c | 622 | int err; |
5d385153 | 623 | pr_info("Installing v9fs 9p2000 file system support\n"); |
a80d923e | 624 | /* TODO: Setup list of registered trasnport modules */ |
60e78d2c AK |
625 | |
626 | err = v9fs_cache_register(); | |
627 | if (err < 0) { | |
5d385153 | 628 | pr_err("Failed to register v9fs for caching\n"); |
2226a288 | 629 | return err; |
60e78d2c AK |
630 | } |
631 | ||
632 | err = v9fs_sysfs_init(); | |
633 | if (err < 0) { | |
5d385153 | 634 | pr_err("Failed to register with sysfs\n"); |
2226a288 AV |
635 | goto out_cache; |
636 | } | |
637 | err = register_filesystem(&v9fs_fs_type); | |
638 | if (err < 0) { | |
639 | pr_err("Failed to register filesystem\n"); | |
60e78d2c AK |
640 | goto out_sysfs_cleanup; |
641 | } | |
642 | ||
643 | return 0; | |
644 | ||
645 | out_sysfs_cleanup: | |
646 | v9fs_sysfs_cleanup(); | |
647 | ||
2226a288 AV |
648 | out_cache: |
649 | v9fs_cache_unregister(); | |
60e78d2c AK |
650 | |
651 | return err; | |
9e82cf6a EVH |
652 | } |
653 | ||
654 | /** | |
60e78d2c | 655 | * exit_v9fs - shutdown module |
9e82cf6a EVH |
656 | * |
657 | */ | |
658 | ||
659 | static void __exit exit_v9fs(void) | |
660 | { | |
60e78d2c AK |
661 | v9fs_sysfs_cleanup(); |
662 | v9fs_cache_unregister(); | |
9e82cf6a EVH |
663 | unregister_filesystem(&v9fs_fs_type); |
664 | } | |
665 | ||
666 | module_init(init_v9fs) | |
667 | module_exit(exit_v9fs) | |
668 | ||
bd238fb4 | 669 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
670 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
671 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
672 | MODULE_LICENSE("GPL"); |