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> |
9e82cf6a EVH |
32 | #include <linux/parser.h> |
33 | #include <linux/idr.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
bd238fb4 | 35 | #include <net/9p/9p.h> |
bd238fb4 | 36 | #include <net/9p/client.h> |
8b81ef58 | 37 | #include <net/9p/transport.h> |
9e82cf6a | 38 | #include "v9fs.h" |
9e82cf6a | 39 | #include "v9fs_vfs.h" |
60e78d2c AK |
40 | #include "cache.h" |
41 | ||
42 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); | |
43 | static LIST_HEAD(v9fs_sessionlist); | |
a78ce05d | 44 | struct kmem_cache *v9fs_inode_cache; |
9e82cf6a EVH |
45 | |
46 | /* | |
60e78d2c AK |
47 | * Option Parsing (code inspired by NFS code) |
48 | * NOTE: each transport will parse its own options | |
49 | */ | |
9e82cf6a EVH |
50 | |
51 | enum { | |
52 | /* Options that take integer arguments */ | |
8a0dc95f | 53 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
9e82cf6a | 54 | /* String options */ |
60e78d2c | 55 | Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag, |
9e82cf6a | 56 | /* Options that take no arguments */ |
8a0dc95f | 57 | Opt_nodevmap, |
e03abc0c | 58 | /* Cache options */ |
60e78d2c | 59 | Opt_cache_loose, Opt_fscache, |
ba17674f | 60 | /* Access options */ |
e782ef71 | 61 | Opt_access, Opt_posixacl, |
9e82cf6a EVH |
62 | /* Error token */ |
63 | Opt_err | |
64 | }; | |
65 | ||
a447c093 | 66 | static const match_table_t tokens = { |
9e2f6688 | 67 | {Opt_debug, "debug=%x"}, |
bd32b82d LI |
68 | {Opt_dfltuid, "dfltuid=%u"}, |
69 | {Opt_dfltgid, "dfltgid=%u"}, | |
9e82cf6a | 70 | {Opt_afid, "afid=%u"}, |
67543e50 | 71 | {Opt_uname, "uname=%s"}, |
9e82cf6a | 72 | {Opt_remotename, "aname=%s"}, |
9e82cf6a | 73 | {Opt_nodevmap, "nodevmap"}, |
60e78d2c | 74 | {Opt_cache, "cache=%s"}, |
e03abc0c | 75 | {Opt_cache_loose, "loose"}, |
60e78d2c AK |
76 | {Opt_fscache, "fscache"}, |
77 | {Opt_cachetag, "cachetag=%s"}, | |
ba17674f | 78 | {Opt_access, "access=%s"}, |
e782ef71 | 79 | {Opt_posixacl, "posixacl"}, |
9e82cf6a EVH |
80 | {Opt_err, NULL} |
81 | }; | |
82 | ||
a2dd43bb PK |
83 | /* Interpret mount options for cache mode */ |
84 | static int get_cache_mode(char *s) | |
85 | { | |
86 | int version = -EINVAL; | |
87 | ||
88 | if (!strcmp(s, "loose")) { | |
89 | version = CACHE_LOOSE; | |
5d385153 | 90 | p9_debug(P9_DEBUG_9P, "Cache mode: loose\n"); |
a2dd43bb PK |
91 | } else if (!strcmp(s, "fscache")) { |
92 | version = CACHE_FSCACHE; | |
5d385153 | 93 | p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n"); |
a2dd43bb PK |
94 | } else if (!strcmp(s, "none")) { |
95 | version = CACHE_NONE; | |
5d385153 | 96 | p9_debug(P9_DEBUG_9P, "Cache mode: none\n"); |
a2dd43bb | 97 | } else |
5d385153 | 98 | pr_info("Unknown Cache mode %s\n", s); |
a2dd43bb PK |
99 | return version; |
100 | } | |
101 | ||
9e82cf6a EVH |
102 | /** |
103 | * v9fs_parse_options - parse mount options into session structure | |
9e82cf6a EVH |
104 | * @v9ses: existing v9fs session information |
105 | * | |
ab31267d | 106 | * Return 0 upon success, -ERRNO upon failure. |
9e82cf6a EVH |
107 | */ |
108 | ||
4b53e4b5 | 109 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
9e82cf6a | 110 | { |
d8c8a9e3 | 111 | char *options, *tmp_options; |
9e82cf6a | 112 | substring_t args[MAX_OPT_ARGS]; |
a80d923e | 113 | char *p; |
8a0dc95f | 114 | int option = 0; |
ba17674f | 115 | char *s, *e; |
ab31267d | 116 | int ret = 0; |
9e82cf6a EVH |
117 | |
118 | /* setup defaults */ | |
9e82cf6a EVH |
119 | v9ses->afid = ~0; |
120 | v9ses->debug = 0; | |
a2dd43bb | 121 | v9ses->cache = CACHE_NONE; |
60e78d2c AK |
122 | #ifdef CONFIG_9P_FSCACHE |
123 | v9ses->cachetag = NULL; | |
124 | #endif | |
9e82cf6a | 125 | |
4b53e4b5 | 126 | if (!opts) |
ab31267d | 127 | return 0; |
9e82cf6a | 128 | |
d8c8a9e3 | 129 | tmp_options = kstrdup(opts, GFP_KERNEL); |
bf2d29c6 EVH |
130 | if (!tmp_options) { |
131 | ret = -ENOMEM; | |
60e78d2c | 132 | goto fail_option_alloc; |
bf2d29c6 | 133 | } |
d8c8a9e3 | 134 | options = tmp_options; |
ab31267d | 135 | |
9e82cf6a | 136 | while ((p = strsep(&options, ",")) != NULL) { |
4d5077f1 | 137 | int token, r; |
9e82cf6a EVH |
138 | if (!*p) |
139 | continue; | |
140 | token = match_token(p, tokens, args); | |
4d5077f1 AK |
141 | switch (token) { |
142 | case Opt_debug: | |
143 | r = match_int(&args[0], &option); | |
ab31267d | 144 | if (r < 0) { |
5d385153 JP |
145 | p9_debug(P9_DEBUG_ERROR, |
146 | "integer field, but no integer?\n"); | |
ab31267d | 147 | ret = r; |
9e82cf6a EVH |
148 | continue; |
149 | } | |
9e2f6688 | 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 | 156 | case Opt_dfltuid: |
4d5077f1 AK |
157 | r = match_int(&args[0], &option); |
158 | if (r < 0) { | |
5d385153 JP |
159 | p9_debug(P9_DEBUG_ERROR, |
160 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
161 | ret = r; |
162 | continue; | |
163 | } | |
76ed23a5 EB |
164 | v9ses->dfltuid = make_kuid(current_user_ns(), option); |
165 | if (!uid_valid(v9ses->dfltuid)) { | |
166 | p9_debug(P9_DEBUG_ERROR, | |
167 | "uid field, but not a uid?\n"); | |
168 | ret = -EINVAL; | |
169 | continue; | |
170 | } | |
9e82cf6a | 171 | break; |
bd32b82d | 172 | case Opt_dfltgid: |
4d5077f1 AK |
173 | r = match_int(&args[0], &option); |
174 | if (r < 0) { | |
5d385153 JP |
175 | p9_debug(P9_DEBUG_ERROR, |
176 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
177 | ret = r; |
178 | continue; | |
179 | } | |
76ed23a5 EB |
180 | v9ses->dfltgid = make_kgid(current_user_ns(), option); |
181 | if (!gid_valid(v9ses->dfltgid)) { | |
182 | p9_debug(P9_DEBUG_ERROR, | |
183 | "gid field, but not a gid?\n"); | |
184 | ret = -EINVAL; | |
185 | continue; | |
186 | } | |
9e82cf6a EVH |
187 | break; |
188 | case Opt_afid: | |
4d5077f1 AK |
189 | r = match_int(&args[0], &option); |
190 | if (r < 0) { | |
5d385153 JP |
191 | p9_debug(P9_DEBUG_ERROR, |
192 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
193 | ret = r; |
194 | continue; | |
195 | } | |
9e82cf6a EVH |
196 | v9ses->afid = option; |
197 | break; | |
67543e50 | 198 | case Opt_uname: |
e549c133 JL |
199 | kfree(v9ses->uname); |
200 | v9ses->uname = match_strdup(&args[0]); | |
201 | if (!v9ses->uname) { | |
202 | ret = -ENOMEM; | |
203 | goto free_and_return; | |
204 | } | |
9e82cf6a EVH |
205 | break; |
206 | case Opt_remotename: | |
e549c133 JL |
207 | kfree(v9ses->aname); |
208 | v9ses->aname = match_strdup(&args[0]); | |
209 | if (!v9ses->aname) { | |
210 | ret = -ENOMEM; | |
211 | goto free_and_return; | |
212 | } | |
9e82cf6a | 213 | break; |
9e82cf6a EVH |
214 | case Opt_nodevmap: |
215 | v9ses->nodev = 1; | |
216 | break; | |
e03abc0c EVH |
217 | case Opt_cache_loose: |
218 | v9ses->cache = CACHE_LOOSE; | |
219 | break; | |
60e78d2c AK |
220 | case Opt_fscache: |
221 | v9ses->cache = CACHE_FSCACHE; | |
222 | break; | |
223 | case Opt_cachetag: | |
224 | #ifdef CONFIG_9P_FSCACHE | |
225 | v9ses->cachetag = match_strdup(&args[0]); | |
226 | #endif | |
227 | break; | |
228 | case Opt_cache: | |
229 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
230 | if (!s) { |
231 | ret = -ENOMEM; | |
5d385153 JP |
232 | p9_debug(P9_DEBUG_ERROR, |
233 | "problem allocating copy of cache arg\n"); | |
bf2d29c6 EVH |
234 | goto free_and_return; |
235 | } | |
a2dd43bb PK |
236 | ret = get_cache_mode(s); |
237 | if (ret == -EINVAL) { | |
238 | kfree(s); | |
239 | goto free_and_return; | |
240 | } | |
60e78d2c | 241 | |
a2dd43bb | 242 | v9ses->cache = ret; |
60e78d2c AK |
243 | kfree(s); |
244 | break; | |
ba17674f LI |
245 | |
246 | case Opt_access: | |
247 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
248 | if (!s) { |
249 | ret = -ENOMEM; | |
5d385153 JP |
250 | p9_debug(P9_DEBUG_ERROR, |
251 | "problem allocating copy of access arg\n"); | |
bf2d29c6 EVH |
252 | goto free_and_return; |
253 | } | |
60e78d2c | 254 | |
ba17674f LI |
255 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
256 | if (strcmp(s, "user") == 0) | |
257 | v9ses->flags |= V9FS_ACCESS_USER; | |
258 | else if (strcmp(s, "any") == 0) | |
259 | v9ses->flags |= V9FS_ACCESS_ANY; | |
76381a42 | 260 | else if (strcmp(s, "client") == 0) { |
76381a42 | 261 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
76381a42 | 262 | } else { |
76ed23a5 | 263 | uid_t uid; |
ba17674f | 264 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
76ed23a5 | 265 | uid = simple_strtoul(s, &e, 10); |
a2dd43bb PK |
266 | if (*e != '\0') { |
267 | ret = -EINVAL; | |
5d385153 JP |
268 | pr_info("Unknown access argument %s\n", |
269 | s); | |
a2dd43bb PK |
270 | kfree(s); |
271 | goto free_and_return; | |
272 | } | |
76ed23a5 EB |
273 | v9ses->uid = make_kuid(current_user_ns(), uid); |
274 | if (!uid_valid(v9ses->uid)) { | |
275 | ret = -EINVAL; | |
276 | pr_info("Uknown uid %s\n", s); | |
277 | kfree(s); | |
278 | goto free_and_return; | |
279 | } | |
ba17674f | 280 | } |
a2dd43bb | 281 | |
0a976297 | 282 | kfree(s); |
ba17674f LI |
283 | break; |
284 | ||
e782ef71 VJJ |
285 | case Opt_posixacl: |
286 | #ifdef CONFIG_9P_FS_POSIX_ACL | |
287 | v9ses->flags |= V9FS_POSIX_ACL; | |
288 | #else | |
5d385153 JP |
289 | p9_debug(P9_DEBUG_ERROR, |
290 | "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n"); | |
e782ef71 VJJ |
291 | #endif |
292 | break; | |
293 | ||
9e82cf6a EVH |
294 | default: |
295 | continue; | |
296 | } | |
297 | } | |
d8c8a9e3 | 298 | |
bf2d29c6 | 299 | free_and_return: |
d8c8a9e3 | 300 | kfree(tmp_options); |
60e78d2c | 301 | fail_option_alloc: |
bf2d29c6 | 302 | return ret; |
9e82cf6a EVH |
303 | } |
304 | ||
9e82cf6a EVH |
305 | /** |
306 | * v9fs_session_init - initialize session | |
307 | * @v9ses: session information structure | |
308 | * @dev_name: device being mounted | |
309 | * @data: options | |
310 | * | |
311 | */ | |
312 | ||
bd238fb4 | 313 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
314 | const char *dev_name, char *data) |
315 | { | |
9e82cf6a | 316 | int retval = -EINVAL; |
bd238fb4 | 317 | struct p9_fid *fid; |
ab31267d | 318 | int rc; |
9e82cf6a | 319 | |
e549c133 | 320 | v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL); |
ba17674f | 321 | if (!v9ses->uname) |
bd238fb4 | 322 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 323 | |
e549c133 | 324 | v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL); |
ba17674f | 325 | if (!v9ses->aname) { |
e549c133 | 326 | kfree(v9ses->uname); |
bd238fb4 | 327 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 328 | } |
a534c8d1 | 329 | init_rwsem(&v9ses->rename_sem); |
9e82cf6a | 330 | |
0ed07ddb JA |
331 | rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); |
332 | if (rc) { | |
e549c133 JL |
333 | kfree(v9ses->aname); |
334 | kfree(v9ses->uname); | |
0ed07ddb JA |
335 | return ERR_PTR(rc); |
336 | } | |
337 | ||
60e78d2c AK |
338 | spin_lock(&v9fs_sessionlist_lock); |
339 | list_add(&v9ses->slist, &v9fs_sessionlist); | |
340 | spin_unlock(&v9fs_sessionlist_lock); | |
341 | ||
76ed23a5 | 342 | v9ses->uid = INVALID_UID; |
bd32b82d LI |
343 | v9ses->dfltuid = V9FS_DEFUID; |
344 | v9ses->dfltgid = V9FS_DEFGID; | |
ab31267d | 345 | |
4b53e4b5 | 346 | v9ses->clnt = p9_client_create(dev_name, data); |
bd238fb4 LI |
347 | if (IS_ERR(v9ses->clnt)) { |
348 | retval = PTR_ERR(v9ses->clnt); | |
349 | v9ses->clnt = NULL; | |
5d385153 | 350 | p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
bd238fb4 | 351 | goto error; |
9e82cf6a EVH |
352 | } |
353 | ||
6752a1eb VJJ |
354 | v9ses->flags = V9FS_ACCESS_USER; |
355 | ||
356 | if (p9_is_proto_dotl(v9ses->clnt)) { | |
357 | v9ses->flags = V9FS_ACCESS_CLIENT; | |
476ada04 | 358 | v9ses->flags |= V9FS_PROTO_2000L; |
6752a1eb | 359 | } else if (p9_is_proto_dotu(v9ses->clnt)) { |
476ada04 | 360 | v9ses->flags |= V9FS_PROTO_2000U; |
6752a1eb VJJ |
361 | } |
362 | ||
363 | rc = v9fs_parse_options(v9ses, data); | |
364 | if (rc < 0) { | |
365 | retval = rc; | |
366 | goto error; | |
367 | } | |
ba17674f | 368 | |
fbedadc1 | 369 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
8a0dc95f | 370 | |
76381a42 AK |
371 | if (!v9fs_proto_dotl(v9ses) && |
372 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
373 | /* | |
374 | * We support ACCESS_CLIENT only for dotl. | |
375 | * Fall back to ACCESS_USER | |
376 | */ | |
377 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
378 | v9ses->flags |= V9FS_ACCESS_USER; | |
379 | } | |
380 | /*FIXME !! */ | |
ba17674f | 381 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
9ffaf63e | 382 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
ba17674f LI |
383 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
384 | ||
385 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
386 | v9ses->flags |= V9FS_ACCESS_ANY; | |
76ed23a5 | 387 | v9ses->uid = INVALID_UID; |
ba17674f | 388 | } |
e782ef71 VJJ |
389 | if (!v9fs_proto_dotl(v9ses) || |
390 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
391 | /* | |
392 | * We support ACL checks on clinet only if the protocol is | |
393 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. | |
394 | */ | |
395 | v9ses->flags &= ~V9FS_ACL_MASK; | |
396 | } | |
ba17674f | 397 | |
f791f7c5 | 398 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID, |
ba17674f | 399 | v9ses->aname); |
bd238fb4 LI |
400 | if (IS_ERR(fid)) { |
401 | retval = PTR_ERR(fid); | |
402 | fid = NULL; | |
5d385153 | 403 | p9_debug(P9_DEBUG_ERROR, "cannot attach\n"); |
bd238fb4 | 404 | goto error; |
9e82cf6a EVH |
405 | } |
406 | ||
ba17674f LI |
407 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
408 | fid->uid = v9ses->uid; | |
409 | else | |
b4642556 | 410 | fid->uid = INVALID_UID; |
ba17674f | 411 | |
60e78d2c AK |
412 | #ifdef CONFIG_9P_FSCACHE |
413 | /* register the session for caching */ | |
414 | v9fs_cache_session_get_cookie(v9ses); | |
415 | #endif | |
416 | ||
bd238fb4 | 417 | return fid; |
9e82cf6a | 418 | |
bd238fb4 | 419 | error: |
0ed07ddb | 420 | bdi_destroy(&v9ses->bdi); |
bd238fb4 | 421 | return ERR_PTR(retval); |
9e82cf6a EVH |
422 | } |
423 | ||
424 | /** | |
425 | * v9fs_session_close - shutdown a session | |
426 | * @v9ses: session information structure | |
427 | * | |
428 | */ | |
429 | ||
430 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
431 | { | |
bd238fb4 LI |
432 | if (v9ses->clnt) { |
433 | p9_client_destroy(v9ses->clnt); | |
434 | v9ses->clnt = NULL; | |
3cf6429a | 435 | } |
9e82cf6a | 436 | |
60e78d2c AK |
437 | #ifdef CONFIG_9P_FSCACHE |
438 | if (v9ses->fscache) { | |
439 | v9fs_cache_session_put_cookie(v9ses); | |
440 | kfree(v9ses->cachetag); | |
441 | } | |
442 | #endif | |
e549c133 JL |
443 | kfree(v9ses->uname); |
444 | kfree(v9ses->aname); | |
60e78d2c | 445 | |
0ed07ddb JA |
446 | bdi_destroy(&v9ses->bdi); |
447 | ||
60e78d2c AK |
448 | spin_lock(&v9fs_sessionlist_lock); |
449 | list_del(&v9ses->slist); | |
450 | spin_unlock(&v9fs_sessionlist_lock); | |
9e82cf6a EVH |
451 | } |
452 | ||
322b329a | 453 | /** |
ee443996 EVH |
454 | * v9fs_session_cancel - terminate a session |
455 | * @v9ses: session to terminate | |
456 | * | |
457 | * mark transport as disconnected and cancel all pending requests. | |
322b329a | 458 | */ |
ee443996 | 459 | |
322b329a | 460 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
5d385153 | 461 | p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
bd238fb4 | 462 | p9_client_disconnect(v9ses->clnt); |
322b329a EVH |
463 | } |
464 | ||
6d96d3ab AK |
465 | /** |
466 | * v9fs_session_begin_cancel - Begin terminate of a session | |
467 | * @v9ses: session to terminate | |
468 | * | |
469 | * After this call we don't allow any request other than clunk. | |
470 | */ | |
471 | ||
472 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) | |
473 | { | |
5d385153 | 474 | p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); |
6d96d3ab AK |
475 | p9_client_begin_disconnect(v9ses->clnt); |
476 | } | |
477 | ||
9e82cf6a EVH |
478 | extern int v9fs_error_init(void); |
479 | ||
60e78d2c AK |
480 | static struct kobject *v9fs_kobj; |
481 | ||
482 | #ifdef CONFIG_9P_FSCACHE | |
9e82cf6a | 483 | /** |
60e78d2c AK |
484 | * caches_show - list caches associated with a session |
485 | * | |
486 | * Returns the size of buffer written. | |
487 | */ | |
488 | ||
489 | static ssize_t caches_show(struct kobject *kobj, | |
490 | struct kobj_attribute *attr, | |
491 | char *buf) | |
492 | { | |
493 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; | |
494 | struct v9fs_session_info *v9ses; | |
495 | ||
496 | spin_lock(&v9fs_sessionlist_lock); | |
497 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { | |
498 | if (v9ses->cachetag) { | |
499 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); | |
500 | if (n < 0) { | |
501 | count = n; | |
502 | break; | |
503 | } | |
504 | ||
505 | count += n; | |
506 | limit -= n; | |
507 | } | |
508 | } | |
509 | ||
510 | spin_unlock(&v9fs_sessionlist_lock); | |
511 | return count; | |
512 | } | |
513 | ||
514 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); | |
515 | #endif /* CONFIG_9P_FSCACHE */ | |
516 | ||
517 | static struct attribute *v9fs_attrs[] = { | |
518 | #ifdef CONFIG_9P_FSCACHE | |
519 | &v9fs_attr_cache.attr, | |
520 | #endif | |
521 | NULL, | |
522 | }; | |
523 | ||
524 | static struct attribute_group v9fs_attr_group = { | |
525 | .attrs = v9fs_attrs, | |
526 | }; | |
527 | ||
528 | /** | |
529 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface | |
530 | * | |
531 | */ | |
532 | ||
533 | static int v9fs_sysfs_init(void) | |
534 | { | |
535 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); | |
536 | if (!v9fs_kobj) | |
537 | return -ENOMEM; | |
538 | ||
539 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { | |
540 | kobject_put(v9fs_kobj); | |
541 | return -ENOMEM; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | /** | |
548 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface | |
549 | * | |
550 | */ | |
551 | ||
552 | static void v9fs_sysfs_cleanup(void) | |
553 | { | |
554 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); | |
555 | kobject_put(v9fs_kobj); | |
556 | } | |
557 | ||
a78ce05d AK |
558 | static void v9fs_inode_init_once(void *foo) |
559 | { | |
560 | struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; | |
561 | #ifdef CONFIG_9P_FSCACHE | |
562 | v9inode->fscache = NULL; | |
a78ce05d | 563 | #endif |
fd2421f5 | 564 | memset(&v9inode->qid, 0, sizeof(v9inode->qid)); |
a78ce05d AK |
565 | inode_init_once(&v9inode->vfs_inode); |
566 | } | |
567 | ||
568 | /** | |
569 | * v9fs_init_inode_cache - initialize a cache for 9P | |
570 | * Returns 0 on success. | |
571 | */ | |
572 | static int v9fs_init_inode_cache(void) | |
573 | { | |
574 | v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", | |
575 | sizeof(struct v9fs_inode), | |
576 | 0, (SLAB_RECLAIM_ACCOUNT| | |
577 | SLAB_MEM_SPREAD), | |
578 | v9fs_inode_init_once); | |
579 | if (!v9fs_inode_cache) | |
580 | return -ENOMEM; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | /** | |
586 | * v9fs_destroy_inode_cache - destroy the cache of 9P inode | |
587 | * | |
588 | */ | |
589 | static void v9fs_destroy_inode_cache(void) | |
590 | { | |
8c0a8537 KS |
591 | /* |
592 | * Make sure all delayed rcu free inodes are flushed before we | |
593 | * destroy cache. | |
594 | */ | |
595 | rcu_barrier(); | |
a78ce05d AK |
596 | kmem_cache_destroy(v9fs_inode_cache); |
597 | } | |
598 | ||
599 | static int v9fs_cache_register(void) | |
600 | { | |
601 | int ret; | |
602 | ret = v9fs_init_inode_cache(); | |
603 | if (ret < 0) | |
604 | return ret; | |
605 | #ifdef CONFIG_9P_FSCACHE | |
606 | return fscache_register_netfs(&v9fs_cache_netfs); | |
607 | #else | |
608 | return ret; | |
609 | #endif | |
610 | } | |
611 | ||
612 | static void v9fs_cache_unregister(void) | |
613 | { | |
614 | v9fs_destroy_inode_cache(); | |
615 | #ifdef CONFIG_9P_FSCACHE | |
616 | fscache_unregister_netfs(&v9fs_cache_netfs); | |
617 | #endif | |
618 | } | |
619 | ||
60e78d2c AK |
620 | /** |
621 | * init_v9fs - Initialize module | |
9e82cf6a EVH |
622 | * |
623 | */ | |
624 | ||
625 | static int __init init_v9fs(void) | |
626 | { | |
60e78d2c | 627 | int err; |
5d385153 | 628 | pr_info("Installing v9fs 9p2000 file system support\n"); |
a80d923e | 629 | /* TODO: Setup list of registered trasnport modules */ |
60e78d2c AK |
630 | |
631 | err = v9fs_cache_register(); | |
632 | if (err < 0) { | |
5d385153 | 633 | pr_err("Failed to register v9fs for caching\n"); |
2226a288 | 634 | return err; |
60e78d2c AK |
635 | } |
636 | ||
637 | err = v9fs_sysfs_init(); | |
638 | if (err < 0) { | |
5d385153 | 639 | pr_err("Failed to register with sysfs\n"); |
2226a288 AV |
640 | goto out_cache; |
641 | } | |
642 | err = register_filesystem(&v9fs_fs_type); | |
643 | if (err < 0) { | |
644 | pr_err("Failed to register filesystem\n"); | |
60e78d2c AK |
645 | goto out_sysfs_cleanup; |
646 | } | |
647 | ||
648 | return 0; | |
649 | ||
650 | out_sysfs_cleanup: | |
651 | v9fs_sysfs_cleanup(); | |
652 | ||
2226a288 AV |
653 | out_cache: |
654 | v9fs_cache_unregister(); | |
60e78d2c AK |
655 | |
656 | return err; | |
9e82cf6a EVH |
657 | } |
658 | ||
659 | /** | |
60e78d2c | 660 | * exit_v9fs - shutdown module |
9e82cf6a EVH |
661 | * |
662 | */ | |
663 | ||
664 | static void __exit exit_v9fs(void) | |
665 | { | |
60e78d2c AK |
666 | v9fs_sysfs_cleanup(); |
667 | v9fs_cache_unregister(); | |
9e82cf6a EVH |
668 | unregister_filesystem(&v9fs_fs_type); |
669 | } | |
670 | ||
671 | module_init(init_v9fs) | |
672 | module_exit(exit_v9fs) | |
673 | ||
bd238fb4 | 674 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
675 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
676 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
677 | MODULE_LICENSE("GPL"); |