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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> | |
bd238fb4 | 32 | #include <net/9p/9p.h> |
bd238fb4 | 33 | #include <net/9p/client.h> |
8b81ef58 | 34 | #include <net/9p/transport.h> |
9e82cf6a | 35 | #include "v9fs.h" |
9e82cf6a | 36 | #include "v9fs_vfs.h" |
60e78d2c AK |
37 | #include "cache.h" |
38 | ||
39 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); | |
40 | static LIST_HEAD(v9fs_sessionlist); | |
9e82cf6a EVH |
41 | |
42 | /* | |
60e78d2c AK |
43 | * Option Parsing (code inspired by NFS code) |
44 | * NOTE: each transport will parse its own options | |
45 | */ | |
9e82cf6a EVH |
46 | |
47 | enum { | |
48 | /* Options that take integer arguments */ | |
8a0dc95f | 49 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
9e82cf6a | 50 | /* String options */ |
60e78d2c | 51 | Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag, |
9e82cf6a | 52 | /* Options that take no arguments */ |
8a0dc95f | 53 | Opt_nodevmap, |
e03abc0c | 54 | /* Cache options */ |
60e78d2c | 55 | Opt_cache_loose, Opt_fscache, |
ba17674f LI |
56 | /* Access options */ |
57 | Opt_access, | |
9e82cf6a EVH |
58 | /* Error token */ |
59 | Opt_err | |
60 | }; | |
61 | ||
a447c093 | 62 | static const match_table_t tokens = { |
9e2f6688 | 63 | {Opt_debug, "debug=%x"}, |
bd32b82d LI |
64 | {Opt_dfltuid, "dfltuid=%u"}, |
65 | {Opt_dfltgid, "dfltgid=%u"}, | |
9e82cf6a | 66 | {Opt_afid, "afid=%u"}, |
67543e50 | 67 | {Opt_uname, "uname=%s"}, |
9e82cf6a | 68 | {Opt_remotename, "aname=%s"}, |
9e82cf6a | 69 | {Opt_nodevmap, "nodevmap"}, |
60e78d2c | 70 | {Opt_cache, "cache=%s"}, |
e03abc0c | 71 | {Opt_cache_loose, "loose"}, |
60e78d2c AK |
72 | {Opt_fscache, "fscache"}, |
73 | {Opt_cachetag, "cachetag=%s"}, | |
ba17674f | 74 | {Opt_access, "access=%s"}, |
9e82cf6a EVH |
75 | {Opt_err, NULL} |
76 | }; | |
77 | ||
9e82cf6a EVH |
78 | /** |
79 | * v9fs_parse_options - parse mount options into session structure | |
9e82cf6a EVH |
80 | * @v9ses: existing v9fs session information |
81 | * | |
ab31267d | 82 | * Return 0 upon success, -ERRNO upon failure. |
9e82cf6a EVH |
83 | */ |
84 | ||
4b53e4b5 | 85 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
9e82cf6a | 86 | { |
d8c8a9e3 | 87 | char *options, *tmp_options; |
9e82cf6a | 88 | substring_t args[MAX_OPT_ARGS]; |
a80d923e | 89 | char *p; |
8a0dc95f | 90 | int option = 0; |
ba17674f | 91 | char *s, *e; |
ab31267d | 92 | int ret = 0; |
9e82cf6a EVH |
93 | |
94 | /* setup defaults */ | |
9e82cf6a EVH |
95 | v9ses->afid = ~0; |
96 | v9ses->debug = 0; | |
e03abc0c | 97 | v9ses->cache = 0; |
60e78d2c AK |
98 | #ifdef CONFIG_9P_FSCACHE |
99 | v9ses->cachetag = NULL; | |
100 | #endif | |
9e82cf6a | 101 | |
4b53e4b5 | 102 | if (!opts) |
ab31267d | 103 | return 0; |
9e82cf6a | 104 | |
d8c8a9e3 | 105 | tmp_options = kstrdup(opts, GFP_KERNEL); |
bf2d29c6 EVH |
106 | if (!tmp_options) { |
107 | ret = -ENOMEM; | |
60e78d2c | 108 | goto fail_option_alloc; |
bf2d29c6 | 109 | } |
d8c8a9e3 | 110 | options = tmp_options; |
ab31267d | 111 | |
9e82cf6a EVH |
112 | while ((p = strsep(&options, ",")) != NULL) { |
113 | int token; | |
114 | if (!*p) | |
115 | continue; | |
116 | token = match_token(p, tokens, args); | |
67543e50 | 117 | if (token < Opt_uname) { |
ab31267d JM |
118 | int r = match_int(&args[0], &option); |
119 | if (r < 0) { | |
bd238fb4 | 120 | P9_DPRINTK(P9_DEBUG_ERROR, |
9e82cf6a | 121 | "integer field, but no integer?\n"); |
ab31267d | 122 | ret = r; |
9e82cf6a EVH |
123 | continue; |
124 | } | |
9e82cf6a EVH |
125 | } |
126 | switch (token) { | |
9e2f6688 EVH |
127 | case Opt_debug: |
128 | v9ses->debug = option; | |
10fa16e7 | 129 | #ifdef CONFIG_NET_9P_DEBUG |
9e2f6688 | 130 | p9_debug_level = option; |
10fa16e7 | 131 | #endif |
9e2f6688 | 132 | break; |
8a0dc95f | 133 | |
bd32b82d LI |
134 | case Opt_dfltuid: |
135 | v9ses->dfltuid = option; | |
9e82cf6a | 136 | break; |
bd32b82d LI |
137 | case Opt_dfltgid: |
138 | v9ses->dfltgid = option; | |
9e82cf6a EVH |
139 | break; |
140 | case Opt_afid: | |
141 | v9ses->afid = option; | |
142 | break; | |
67543e50 | 143 | case Opt_uname: |
b32a09db | 144 | match_strlcpy(v9ses->uname, &args[0], PATH_MAX); |
9e82cf6a EVH |
145 | break; |
146 | case Opt_remotename: | |
b32a09db | 147 | match_strlcpy(v9ses->aname, &args[0], PATH_MAX); |
9e82cf6a | 148 | break; |
9e82cf6a EVH |
149 | case Opt_nodevmap: |
150 | v9ses->nodev = 1; | |
151 | break; | |
e03abc0c EVH |
152 | case Opt_cache_loose: |
153 | v9ses->cache = CACHE_LOOSE; | |
154 | break; | |
60e78d2c AK |
155 | case Opt_fscache: |
156 | v9ses->cache = CACHE_FSCACHE; | |
157 | break; | |
158 | case Opt_cachetag: | |
159 | #ifdef CONFIG_9P_FSCACHE | |
160 | v9ses->cachetag = match_strdup(&args[0]); | |
161 | #endif | |
162 | break; | |
163 | case Opt_cache: | |
164 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
165 | if (!s) { |
166 | ret = -ENOMEM; | |
167 | P9_DPRINTK(P9_DEBUG_ERROR, | |
168 | "problem allocating copy of cache arg\n"); | |
169 | goto free_and_return; | |
170 | } | |
60e78d2c AK |
171 | |
172 | if (strcmp(s, "loose") == 0) | |
173 | v9ses->cache = CACHE_LOOSE; | |
174 | else if (strcmp(s, "fscache") == 0) | |
175 | v9ses->cache = CACHE_FSCACHE; | |
176 | else | |
177 | v9ses->cache = CACHE_NONE; | |
178 | kfree(s); | |
179 | break; | |
ba17674f LI |
180 | |
181 | case Opt_access: | |
182 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
183 | if (!s) { |
184 | ret = -ENOMEM; | |
185 | P9_DPRINTK(P9_DEBUG_ERROR, | |
186 | "problem allocating copy of access arg\n"); | |
187 | goto free_and_return; | |
188 | } | |
60e78d2c | 189 | |
ba17674f LI |
190 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
191 | if (strcmp(s, "user") == 0) | |
192 | v9ses->flags |= V9FS_ACCESS_USER; | |
193 | else if (strcmp(s, "any") == 0) | |
194 | v9ses->flags |= V9FS_ACCESS_ANY; | |
195 | else { | |
196 | v9ses->flags |= V9FS_ACCESS_SINGLE; | |
f1d9e458 | 197 | v9ses->uid = simple_strtoul(s, &e, 10); |
ba17674f LI |
198 | if (*e != '\0') |
199 | v9ses->uid = ~0; | |
200 | } | |
0a976297 | 201 | kfree(s); |
ba17674f LI |
202 | break; |
203 | ||
9e82cf6a EVH |
204 | default: |
205 | continue; | |
206 | } | |
207 | } | |
d8c8a9e3 | 208 | |
bf2d29c6 | 209 | free_and_return: |
d8c8a9e3 | 210 | kfree(tmp_options); |
60e78d2c | 211 | fail_option_alloc: |
bf2d29c6 | 212 | return ret; |
9e82cf6a EVH |
213 | } |
214 | ||
9e82cf6a EVH |
215 | /** |
216 | * v9fs_session_init - initialize session | |
217 | * @v9ses: session information structure | |
218 | * @dev_name: device being mounted | |
219 | * @data: options | |
220 | * | |
221 | */ | |
222 | ||
bd238fb4 | 223 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
224 | const char *dev_name, char *data) |
225 | { | |
9e82cf6a | 226 | int retval = -EINVAL; |
bd238fb4 | 227 | struct p9_fid *fid; |
ab31267d | 228 | int rc; |
9e82cf6a | 229 | |
ba17674f LI |
230 | v9ses->uname = __getname(); |
231 | if (!v9ses->uname) | |
bd238fb4 | 232 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 233 | |
ba17674f LI |
234 | v9ses->aname = __getname(); |
235 | if (!v9ses->aname) { | |
236 | __putname(v9ses->uname); | |
bd238fb4 | 237 | return ERR_PTR(-ENOMEM); |
9e82cf6a EVH |
238 | } |
239 | ||
60e78d2c AK |
240 | spin_lock(&v9fs_sessionlist_lock); |
241 | list_add(&v9ses->slist, &v9fs_sessionlist); | |
242 | spin_unlock(&v9fs_sessionlist_lock); | |
243 | ||
dd6102fb | 244 | v9ses->flags = V9FS_PROTO_2000U | V9FS_ACCESS_USER; |
ba17674f LI |
245 | strcpy(v9ses->uname, V9FS_DEFUSER); |
246 | strcpy(v9ses->aname, V9FS_DEFANAME); | |
247 | v9ses->uid = ~0; | |
bd32b82d LI |
248 | v9ses->dfltuid = V9FS_DEFUID; |
249 | v9ses->dfltgid = V9FS_DEFGID; | |
ab31267d | 250 | |
4b53e4b5 | 251 | rc = v9fs_parse_options(v9ses, data); |
ab31267d JM |
252 | if (rc < 0) { |
253 | retval = rc; | |
254 | goto error; | |
255 | } | |
a80d923e | 256 | |
4b53e4b5 | 257 | v9ses->clnt = p9_client_create(dev_name, data); |
bd238fb4 LI |
258 | if (IS_ERR(v9ses->clnt)) { |
259 | retval = PTR_ERR(v9ses->clnt); | |
260 | v9ses->clnt = NULL; | |
261 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); | |
262 | goto error; | |
9e82cf6a EVH |
263 | } |
264 | ||
342fee1d | 265 | if (!p9_is_proto_dotu(v9ses->clnt)) |
dd6102fb | 266 | v9ses->flags &= ~V9FS_PROTO_2000U; |
ba17674f | 267 | |
fbedadc1 | 268 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
8a0dc95f | 269 | |
ba17674f | 270 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
dd6102fb | 271 | if (!v9fs_proto_dotu(v9ses) && |
ba17674f LI |
272 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
273 | ||
274 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
275 | v9ses->flags |= V9FS_ACCESS_ANY; | |
276 | v9ses->uid = ~0; | |
277 | } | |
278 | ||
279 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, | |
280 | v9ses->aname); | |
bd238fb4 LI |
281 | if (IS_ERR(fid)) { |
282 | retval = PTR_ERR(fid); | |
283 | fid = NULL; | |
284 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); | |
285 | goto error; | |
9e82cf6a EVH |
286 | } |
287 | ||
ba17674f LI |
288 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
289 | fid->uid = v9ses->uid; | |
290 | else | |
291 | fid->uid = ~0; | |
292 | ||
60e78d2c AK |
293 | #ifdef CONFIG_9P_FSCACHE |
294 | /* register the session for caching */ | |
295 | v9fs_cache_session_get_cookie(v9ses); | |
296 | #endif | |
297 | ||
bd238fb4 | 298 | return fid; |
9e82cf6a | 299 | |
bd238fb4 | 300 | error: |
bd238fb4 | 301 | return ERR_PTR(retval); |
9e82cf6a EVH |
302 | } |
303 | ||
304 | /** | |
305 | * v9fs_session_close - shutdown a session | |
306 | * @v9ses: session information structure | |
307 | * | |
308 | */ | |
309 | ||
310 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
311 | { | |
bd238fb4 LI |
312 | if (v9ses->clnt) { |
313 | p9_client_destroy(v9ses->clnt); | |
314 | v9ses->clnt = NULL; | |
3cf6429a | 315 | } |
9e82cf6a | 316 | |
60e78d2c AK |
317 | #ifdef CONFIG_9P_FSCACHE |
318 | if (v9ses->fscache) { | |
319 | v9fs_cache_session_put_cookie(v9ses); | |
320 | kfree(v9ses->cachetag); | |
321 | } | |
322 | #endif | |
ba17674f LI |
323 | __putname(v9ses->uname); |
324 | __putname(v9ses->aname); | |
60e78d2c AK |
325 | |
326 | spin_lock(&v9fs_sessionlist_lock); | |
327 | list_del(&v9ses->slist); | |
328 | spin_unlock(&v9fs_sessionlist_lock); | |
9e82cf6a EVH |
329 | } |
330 | ||
322b329a | 331 | /** |
ee443996 EVH |
332 | * v9fs_session_cancel - terminate a session |
333 | * @v9ses: session to terminate | |
334 | * | |
335 | * mark transport as disconnected and cancel all pending requests. | |
322b329a | 336 | */ |
ee443996 | 337 | |
322b329a | 338 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
bd238fb4 LI |
339 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
340 | p9_client_disconnect(v9ses->clnt); | |
322b329a EVH |
341 | } |
342 | ||
9e82cf6a EVH |
343 | extern int v9fs_error_init(void); |
344 | ||
60e78d2c AK |
345 | static struct kobject *v9fs_kobj; |
346 | ||
347 | #ifdef CONFIG_9P_FSCACHE | |
9e82cf6a | 348 | /** |
60e78d2c AK |
349 | * caches_show - list caches associated with a session |
350 | * | |
351 | * Returns the size of buffer written. | |
352 | */ | |
353 | ||
354 | static ssize_t caches_show(struct kobject *kobj, | |
355 | struct kobj_attribute *attr, | |
356 | char *buf) | |
357 | { | |
358 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; | |
359 | struct v9fs_session_info *v9ses; | |
360 | ||
361 | spin_lock(&v9fs_sessionlist_lock); | |
362 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { | |
363 | if (v9ses->cachetag) { | |
364 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); | |
365 | if (n < 0) { | |
366 | count = n; | |
367 | break; | |
368 | } | |
369 | ||
370 | count += n; | |
371 | limit -= n; | |
372 | } | |
373 | } | |
374 | ||
375 | spin_unlock(&v9fs_sessionlist_lock); | |
376 | return count; | |
377 | } | |
378 | ||
379 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); | |
380 | #endif /* CONFIG_9P_FSCACHE */ | |
381 | ||
382 | static struct attribute *v9fs_attrs[] = { | |
383 | #ifdef CONFIG_9P_FSCACHE | |
384 | &v9fs_attr_cache.attr, | |
385 | #endif | |
386 | NULL, | |
387 | }; | |
388 | ||
389 | static struct attribute_group v9fs_attr_group = { | |
390 | .attrs = v9fs_attrs, | |
391 | }; | |
392 | ||
393 | /** | |
394 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface | |
395 | * | |
396 | */ | |
397 | ||
398 | static int v9fs_sysfs_init(void) | |
399 | { | |
400 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); | |
401 | if (!v9fs_kobj) | |
402 | return -ENOMEM; | |
403 | ||
404 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { | |
405 | kobject_put(v9fs_kobj); | |
406 | return -ENOMEM; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | /** | |
413 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface | |
414 | * | |
415 | */ | |
416 | ||
417 | static void v9fs_sysfs_cleanup(void) | |
418 | { | |
419 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); | |
420 | kobject_put(v9fs_kobj); | |
421 | } | |
422 | ||
423 | /** | |
424 | * init_v9fs - Initialize module | |
9e82cf6a EVH |
425 | * |
426 | */ | |
427 | ||
428 | static int __init init_v9fs(void) | |
429 | { | |
60e78d2c | 430 | int err; |
f94b3470 | 431 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
a80d923e | 432 | /* TODO: Setup list of registered trasnport modules */ |
60e78d2c AK |
433 | err = register_filesystem(&v9fs_fs_type); |
434 | if (err < 0) { | |
435 | printk(KERN_ERR "Failed to register filesystem\n"); | |
436 | return err; | |
437 | } | |
438 | ||
439 | err = v9fs_cache_register(); | |
440 | if (err < 0) { | |
441 | printk(KERN_ERR "Failed to register v9fs for caching\n"); | |
442 | goto out_fs_unreg; | |
443 | } | |
444 | ||
445 | err = v9fs_sysfs_init(); | |
446 | if (err < 0) { | |
447 | printk(KERN_ERR "Failed to register with sysfs\n"); | |
448 | goto out_sysfs_cleanup; | |
449 | } | |
450 | ||
451 | return 0; | |
452 | ||
453 | out_sysfs_cleanup: | |
454 | v9fs_sysfs_cleanup(); | |
455 | ||
456 | out_fs_unreg: | |
457 | unregister_filesystem(&v9fs_fs_type); | |
458 | ||
459 | return err; | |
9e82cf6a EVH |
460 | } |
461 | ||
462 | /** | |
60e78d2c | 463 | * exit_v9fs - shutdown module |
9e82cf6a EVH |
464 | * |
465 | */ | |
466 | ||
467 | static void __exit exit_v9fs(void) | |
468 | { | |
60e78d2c AK |
469 | v9fs_sysfs_cleanup(); |
470 | v9fs_cache_unregister(); | |
9e82cf6a EVH |
471 | unregister_filesystem(&v9fs_fs_type); |
472 | } | |
473 | ||
474 | module_init(init_v9fs) | |
475 | module_exit(exit_v9fs) | |
476 | ||
bd238fb4 | 477 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
478 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
479 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
480 | MODULE_LICENSE("GPL"); |