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 | } | |
bd32b82d | 164 | v9ses->dfltuid = option; |
9e82cf6a | 165 | break; |
bd32b82d | 166 | case Opt_dfltgid: |
4d5077f1 AK |
167 | r = match_int(&args[0], &option); |
168 | if (r < 0) { | |
5d385153 JP |
169 | p9_debug(P9_DEBUG_ERROR, |
170 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
171 | ret = r; |
172 | continue; | |
173 | } | |
bd32b82d | 174 | v9ses->dfltgid = option; |
9e82cf6a EVH |
175 | break; |
176 | case Opt_afid: | |
4d5077f1 AK |
177 | r = match_int(&args[0], &option); |
178 | if (r < 0) { | |
5d385153 JP |
179 | p9_debug(P9_DEBUG_ERROR, |
180 | "integer field, but no integer?\n"); | |
4d5077f1 AK |
181 | ret = r; |
182 | continue; | |
183 | } | |
9e82cf6a EVH |
184 | v9ses->afid = option; |
185 | break; | |
67543e50 | 186 | case Opt_uname: |
e549c133 JL |
187 | kfree(v9ses->uname); |
188 | v9ses->uname = match_strdup(&args[0]); | |
189 | if (!v9ses->uname) { | |
190 | ret = -ENOMEM; | |
191 | goto free_and_return; | |
192 | } | |
9e82cf6a EVH |
193 | break; |
194 | case Opt_remotename: | |
e549c133 JL |
195 | kfree(v9ses->aname); |
196 | v9ses->aname = match_strdup(&args[0]); | |
197 | if (!v9ses->aname) { | |
198 | ret = -ENOMEM; | |
199 | goto free_and_return; | |
200 | } | |
9e82cf6a | 201 | break; |
9e82cf6a EVH |
202 | case Opt_nodevmap: |
203 | v9ses->nodev = 1; | |
204 | break; | |
e03abc0c EVH |
205 | case Opt_cache_loose: |
206 | v9ses->cache = CACHE_LOOSE; | |
207 | break; | |
60e78d2c AK |
208 | case Opt_fscache: |
209 | v9ses->cache = CACHE_FSCACHE; | |
210 | break; | |
211 | case Opt_cachetag: | |
212 | #ifdef CONFIG_9P_FSCACHE | |
213 | v9ses->cachetag = match_strdup(&args[0]); | |
214 | #endif | |
215 | break; | |
216 | case Opt_cache: | |
217 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
218 | if (!s) { |
219 | ret = -ENOMEM; | |
5d385153 JP |
220 | p9_debug(P9_DEBUG_ERROR, |
221 | "problem allocating copy of cache arg\n"); | |
bf2d29c6 EVH |
222 | goto free_and_return; |
223 | } | |
a2dd43bb PK |
224 | ret = get_cache_mode(s); |
225 | if (ret == -EINVAL) { | |
226 | kfree(s); | |
227 | goto free_and_return; | |
228 | } | |
60e78d2c | 229 | |
a2dd43bb | 230 | v9ses->cache = ret; |
60e78d2c AK |
231 | kfree(s); |
232 | break; | |
ba17674f LI |
233 | |
234 | case Opt_access: | |
235 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
236 | if (!s) { |
237 | ret = -ENOMEM; | |
5d385153 JP |
238 | p9_debug(P9_DEBUG_ERROR, |
239 | "problem allocating copy of access arg\n"); | |
bf2d29c6 EVH |
240 | goto free_and_return; |
241 | } | |
60e78d2c | 242 | |
ba17674f LI |
243 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
244 | if (strcmp(s, "user") == 0) | |
245 | v9ses->flags |= V9FS_ACCESS_USER; | |
246 | else if (strcmp(s, "any") == 0) | |
247 | v9ses->flags |= V9FS_ACCESS_ANY; | |
76381a42 | 248 | else if (strcmp(s, "client") == 0) { |
76381a42 | 249 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
76381a42 | 250 | } else { |
ba17674f | 251 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
f1d9e458 | 252 | v9ses->uid = simple_strtoul(s, &e, 10); |
a2dd43bb PK |
253 | if (*e != '\0') { |
254 | ret = -EINVAL; | |
5d385153 JP |
255 | pr_info("Unknown access argument %s\n", |
256 | s); | |
a2dd43bb PK |
257 | kfree(s); |
258 | goto free_and_return; | |
259 | } | |
ba17674f | 260 | } |
a2dd43bb | 261 | |
0a976297 | 262 | kfree(s); |
ba17674f LI |
263 | break; |
264 | ||
e782ef71 VJJ |
265 | case Opt_posixacl: |
266 | #ifdef CONFIG_9P_FS_POSIX_ACL | |
267 | v9ses->flags |= V9FS_POSIX_ACL; | |
268 | #else | |
5d385153 JP |
269 | p9_debug(P9_DEBUG_ERROR, |
270 | "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n"); | |
e782ef71 VJJ |
271 | #endif |
272 | break; | |
273 | ||
9e82cf6a EVH |
274 | default: |
275 | continue; | |
276 | } | |
277 | } | |
d8c8a9e3 | 278 | |
bf2d29c6 | 279 | free_and_return: |
d8c8a9e3 | 280 | kfree(tmp_options); |
60e78d2c | 281 | fail_option_alloc: |
bf2d29c6 | 282 | return ret; |
9e82cf6a EVH |
283 | } |
284 | ||
9e82cf6a EVH |
285 | /** |
286 | * v9fs_session_init - initialize session | |
287 | * @v9ses: session information structure | |
288 | * @dev_name: device being mounted | |
289 | * @data: options | |
290 | * | |
291 | */ | |
292 | ||
bd238fb4 | 293 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
294 | const char *dev_name, char *data) |
295 | { | |
9e82cf6a | 296 | int retval = -EINVAL; |
bd238fb4 | 297 | struct p9_fid *fid; |
ab31267d | 298 | int rc; |
9e82cf6a | 299 | |
e549c133 | 300 | v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL); |
ba17674f | 301 | if (!v9ses->uname) |
bd238fb4 | 302 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 303 | |
e549c133 | 304 | v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL); |
ba17674f | 305 | if (!v9ses->aname) { |
e549c133 | 306 | kfree(v9ses->uname); |
bd238fb4 | 307 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 308 | } |
a534c8d1 | 309 | init_rwsem(&v9ses->rename_sem); |
9e82cf6a | 310 | |
0ed07ddb JA |
311 | rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); |
312 | if (rc) { | |
e549c133 JL |
313 | kfree(v9ses->aname); |
314 | kfree(v9ses->uname); | |
0ed07ddb JA |
315 | return ERR_PTR(rc); |
316 | } | |
317 | ||
60e78d2c AK |
318 | spin_lock(&v9fs_sessionlist_lock); |
319 | list_add(&v9ses->slist, &v9fs_sessionlist); | |
320 | spin_unlock(&v9fs_sessionlist_lock); | |
321 | ||
ba17674f | 322 | v9ses->uid = ~0; |
bd32b82d LI |
323 | v9ses->dfltuid = V9FS_DEFUID; |
324 | v9ses->dfltgid = V9FS_DEFGID; | |
ab31267d | 325 | |
4b53e4b5 | 326 | v9ses->clnt = p9_client_create(dev_name, data); |
bd238fb4 LI |
327 | if (IS_ERR(v9ses->clnt)) { |
328 | retval = PTR_ERR(v9ses->clnt); | |
329 | v9ses->clnt = NULL; | |
5d385153 | 330 | p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
bd238fb4 | 331 | goto error; |
9e82cf6a EVH |
332 | } |
333 | ||
6752a1eb VJJ |
334 | v9ses->flags = V9FS_ACCESS_USER; |
335 | ||
336 | if (p9_is_proto_dotl(v9ses->clnt)) { | |
337 | v9ses->flags = V9FS_ACCESS_CLIENT; | |
476ada04 | 338 | v9ses->flags |= V9FS_PROTO_2000L; |
6752a1eb | 339 | } else if (p9_is_proto_dotu(v9ses->clnt)) { |
476ada04 | 340 | v9ses->flags |= V9FS_PROTO_2000U; |
6752a1eb VJJ |
341 | } |
342 | ||
343 | rc = v9fs_parse_options(v9ses, data); | |
344 | if (rc < 0) { | |
345 | retval = rc; | |
346 | goto error; | |
347 | } | |
ba17674f | 348 | |
fbedadc1 | 349 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
8a0dc95f | 350 | |
76381a42 AK |
351 | if (!v9fs_proto_dotl(v9ses) && |
352 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
353 | /* | |
354 | * We support ACCESS_CLIENT only for dotl. | |
355 | * Fall back to ACCESS_USER | |
356 | */ | |
357 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
358 | v9ses->flags |= V9FS_ACCESS_USER; | |
359 | } | |
360 | /*FIXME !! */ | |
ba17674f | 361 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
9ffaf63e | 362 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
ba17674f LI |
363 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
364 | ||
365 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
366 | v9ses->flags |= V9FS_ACCESS_ANY; | |
367 | v9ses->uid = ~0; | |
368 | } | |
e782ef71 VJJ |
369 | if (!v9fs_proto_dotl(v9ses) || |
370 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { | |
371 | /* | |
372 | * We support ACL checks on clinet only if the protocol is | |
373 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. | |
374 | */ | |
375 | v9ses->flags &= ~V9FS_ACL_MASK; | |
376 | } | |
ba17674f LI |
377 | |
378 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, | |
379 | v9ses->aname); | |
bd238fb4 LI |
380 | if (IS_ERR(fid)) { |
381 | retval = PTR_ERR(fid); | |
382 | fid = NULL; | |
5d385153 | 383 | p9_debug(P9_DEBUG_ERROR, "cannot attach\n"); |
bd238fb4 | 384 | goto error; |
9e82cf6a EVH |
385 | } |
386 | ||
ba17674f LI |
387 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
388 | fid->uid = v9ses->uid; | |
389 | else | |
390 | fid->uid = ~0; | |
391 | ||
60e78d2c AK |
392 | #ifdef CONFIG_9P_FSCACHE |
393 | /* register the session for caching */ | |
394 | v9fs_cache_session_get_cookie(v9ses); | |
395 | #endif | |
396 | ||
bd238fb4 | 397 | return fid; |
9e82cf6a | 398 | |
bd238fb4 | 399 | error: |
0ed07ddb | 400 | bdi_destroy(&v9ses->bdi); |
bd238fb4 | 401 | return ERR_PTR(retval); |
9e82cf6a EVH |
402 | } |
403 | ||
404 | /** | |
405 | * v9fs_session_close - shutdown a session | |
406 | * @v9ses: session information structure | |
407 | * | |
408 | */ | |
409 | ||
410 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
411 | { | |
bd238fb4 LI |
412 | if (v9ses->clnt) { |
413 | p9_client_destroy(v9ses->clnt); | |
414 | v9ses->clnt = NULL; | |
3cf6429a | 415 | } |
9e82cf6a | 416 | |
60e78d2c AK |
417 | #ifdef CONFIG_9P_FSCACHE |
418 | if (v9ses->fscache) { | |
419 | v9fs_cache_session_put_cookie(v9ses); | |
420 | kfree(v9ses->cachetag); | |
421 | } | |
422 | #endif | |
e549c133 JL |
423 | kfree(v9ses->uname); |
424 | kfree(v9ses->aname); | |
60e78d2c | 425 | |
0ed07ddb JA |
426 | bdi_destroy(&v9ses->bdi); |
427 | ||
60e78d2c AK |
428 | spin_lock(&v9fs_sessionlist_lock); |
429 | list_del(&v9ses->slist); | |
430 | spin_unlock(&v9fs_sessionlist_lock); | |
9e82cf6a EVH |
431 | } |
432 | ||
322b329a | 433 | /** |
ee443996 EVH |
434 | * v9fs_session_cancel - terminate a session |
435 | * @v9ses: session to terminate | |
436 | * | |
437 | * mark transport as disconnected and cancel all pending requests. | |
322b329a | 438 | */ |
ee443996 | 439 | |
322b329a | 440 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
5d385153 | 441 | p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
bd238fb4 | 442 | p9_client_disconnect(v9ses->clnt); |
322b329a EVH |
443 | } |
444 | ||
6d96d3ab AK |
445 | /** |
446 | * v9fs_session_begin_cancel - Begin terminate of a session | |
447 | * @v9ses: session to terminate | |
448 | * | |
449 | * After this call we don't allow any request other than clunk. | |
450 | */ | |
451 | ||
452 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) | |
453 | { | |
5d385153 | 454 | p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); |
6d96d3ab AK |
455 | p9_client_begin_disconnect(v9ses->clnt); |
456 | } | |
457 | ||
9e82cf6a EVH |
458 | extern int v9fs_error_init(void); |
459 | ||
60e78d2c AK |
460 | static struct kobject *v9fs_kobj; |
461 | ||
462 | #ifdef CONFIG_9P_FSCACHE | |
9e82cf6a | 463 | /** |
60e78d2c AK |
464 | * caches_show - list caches associated with a session |
465 | * | |
466 | * Returns the size of buffer written. | |
467 | */ | |
468 | ||
469 | static ssize_t caches_show(struct kobject *kobj, | |
470 | struct kobj_attribute *attr, | |
471 | char *buf) | |
472 | { | |
473 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; | |
474 | struct v9fs_session_info *v9ses; | |
475 | ||
476 | spin_lock(&v9fs_sessionlist_lock); | |
477 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { | |
478 | if (v9ses->cachetag) { | |
479 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); | |
480 | if (n < 0) { | |
481 | count = n; | |
482 | break; | |
483 | } | |
484 | ||
485 | count += n; | |
486 | limit -= n; | |
487 | } | |
488 | } | |
489 | ||
490 | spin_unlock(&v9fs_sessionlist_lock); | |
491 | return count; | |
492 | } | |
493 | ||
494 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); | |
495 | #endif /* CONFIG_9P_FSCACHE */ | |
496 | ||
497 | static struct attribute *v9fs_attrs[] = { | |
498 | #ifdef CONFIG_9P_FSCACHE | |
499 | &v9fs_attr_cache.attr, | |
500 | #endif | |
501 | NULL, | |
502 | }; | |
503 | ||
504 | static struct attribute_group v9fs_attr_group = { | |
505 | .attrs = v9fs_attrs, | |
506 | }; | |
507 | ||
508 | /** | |
509 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface | |
510 | * | |
511 | */ | |
512 | ||
513 | static int v9fs_sysfs_init(void) | |
514 | { | |
515 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); | |
516 | if (!v9fs_kobj) | |
517 | return -ENOMEM; | |
518 | ||
519 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { | |
520 | kobject_put(v9fs_kobj); | |
521 | return -ENOMEM; | |
522 | } | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | /** | |
528 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface | |
529 | * | |
530 | */ | |
531 | ||
532 | static void v9fs_sysfs_cleanup(void) | |
533 | { | |
534 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); | |
535 | kobject_put(v9fs_kobj); | |
536 | } | |
537 | ||
a78ce05d AK |
538 | static void v9fs_inode_init_once(void *foo) |
539 | { | |
540 | struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; | |
541 | #ifdef CONFIG_9P_FSCACHE | |
542 | v9inode->fscache = NULL; | |
a78ce05d | 543 | #endif |
fd2421f5 | 544 | memset(&v9inode->qid, 0, sizeof(v9inode->qid)); |
a78ce05d AK |
545 | inode_init_once(&v9inode->vfs_inode); |
546 | } | |
547 | ||
548 | /** | |
549 | * v9fs_init_inode_cache - initialize a cache for 9P | |
550 | * Returns 0 on success. | |
551 | */ | |
552 | static int v9fs_init_inode_cache(void) | |
553 | { | |
554 | v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", | |
555 | sizeof(struct v9fs_inode), | |
556 | 0, (SLAB_RECLAIM_ACCOUNT| | |
557 | SLAB_MEM_SPREAD), | |
558 | v9fs_inode_init_once); | |
559 | if (!v9fs_inode_cache) | |
560 | return -ENOMEM; | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
565 | /** | |
566 | * v9fs_destroy_inode_cache - destroy the cache of 9P inode | |
567 | * | |
568 | */ | |
569 | static void v9fs_destroy_inode_cache(void) | |
570 | { | |
8c0a8537 KS |
571 | /* |
572 | * Make sure all delayed rcu free inodes are flushed before we | |
573 | * destroy cache. | |
574 | */ | |
575 | rcu_barrier(); | |
a78ce05d AK |
576 | kmem_cache_destroy(v9fs_inode_cache); |
577 | } | |
578 | ||
579 | static int v9fs_cache_register(void) | |
580 | { | |
581 | int ret; | |
582 | ret = v9fs_init_inode_cache(); | |
583 | if (ret < 0) | |
584 | return ret; | |
585 | #ifdef CONFIG_9P_FSCACHE | |
586 | return fscache_register_netfs(&v9fs_cache_netfs); | |
587 | #else | |
588 | return ret; | |
589 | #endif | |
590 | } | |
591 | ||
592 | static void v9fs_cache_unregister(void) | |
593 | { | |
594 | v9fs_destroy_inode_cache(); | |
595 | #ifdef CONFIG_9P_FSCACHE | |
596 | fscache_unregister_netfs(&v9fs_cache_netfs); | |
597 | #endif | |
598 | } | |
599 | ||
60e78d2c AK |
600 | /** |
601 | * init_v9fs - Initialize module | |
9e82cf6a EVH |
602 | * |
603 | */ | |
604 | ||
605 | static int __init init_v9fs(void) | |
606 | { | |
60e78d2c | 607 | int err; |
5d385153 | 608 | pr_info("Installing v9fs 9p2000 file system support\n"); |
a80d923e | 609 | /* TODO: Setup list of registered trasnport modules */ |
60e78d2c AK |
610 | |
611 | err = v9fs_cache_register(); | |
612 | if (err < 0) { | |
5d385153 | 613 | pr_err("Failed to register v9fs for caching\n"); |
2226a288 | 614 | return err; |
60e78d2c AK |
615 | } |
616 | ||
617 | err = v9fs_sysfs_init(); | |
618 | if (err < 0) { | |
5d385153 | 619 | pr_err("Failed to register with sysfs\n"); |
2226a288 AV |
620 | goto out_cache; |
621 | } | |
622 | err = register_filesystem(&v9fs_fs_type); | |
623 | if (err < 0) { | |
624 | pr_err("Failed to register filesystem\n"); | |
60e78d2c AK |
625 | goto out_sysfs_cleanup; |
626 | } | |
627 | ||
628 | return 0; | |
629 | ||
630 | out_sysfs_cleanup: | |
631 | v9fs_sysfs_cleanup(); | |
632 | ||
2226a288 AV |
633 | out_cache: |
634 | v9fs_cache_unregister(); | |
60e78d2c AK |
635 | |
636 | return err; | |
9e82cf6a EVH |
637 | } |
638 | ||
639 | /** | |
60e78d2c | 640 | * exit_v9fs - shutdown module |
9e82cf6a EVH |
641 | * |
642 | */ | |
643 | ||
644 | static void __exit exit_v9fs(void) | |
645 | { | |
60e78d2c AK |
646 | v9fs_sysfs_cleanup(); |
647 | v9fs_cache_unregister(); | |
9e82cf6a EVH |
648 | unregister_filesystem(&v9fs_fs_type); |
649 | } | |
650 | ||
651 | module_init(init_v9fs) | |
652 | module_exit(exit_v9fs) | |
653 | ||
bd238fb4 | 654 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
655 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
656 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
657 | MODULE_LICENSE("GPL"); |