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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / fs / 9p / v9fs.c
blob38dc0e0675998413dd205d13674412eff054ec4e
1 /*
2 * linux/fs/9p/v9fs.c
3 *
4 * This file contains functions assisting in mapping VFS to 9P2000
5 *
6 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
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
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/sched.h>
30 #include <linux/parser.h>
31 #include <linux/idr.h>
32 #include <linux/slab.h>
33 #include <net/9p/9p.h>
34 #include <net/9p/client.h>
35 #include <net/9p/transport.h>
36 #include "v9fs.h"
37 #include "v9fs_vfs.h"
38 #include "cache.h"
39
40 static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
41 static LIST_HEAD(v9fs_sessionlist);
42
43 /*
44 * Option Parsing (code inspired by NFS code)
45 * NOTE: each transport will parse its own options
46 */
47
48 enum {
49 /* Options that take integer arguments */
50 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
51 /* String options */
52 Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
53 /* Options that take no arguments */
54 Opt_nodevmap,
55 /* Cache options */
56 Opt_cache_loose, Opt_fscache,
57 /* Access options */
58 Opt_access,
59 /* Error token */
60 Opt_err
61 };
62
63 static const match_table_t tokens = {
64 {Opt_debug, "debug=%x"},
65 {Opt_dfltuid, "dfltuid=%u"},
66 {Opt_dfltgid, "dfltgid=%u"},
67 {Opt_afid, "afid=%u"},
68 {Opt_uname, "uname=%s"},
69 {Opt_remotename, "aname=%s"},
70 {Opt_nodevmap, "nodevmap"},
71 {Opt_cache, "cache=%s"},
72 {Opt_cache_loose, "loose"},
73 {Opt_fscache, "fscache"},
74 {Opt_cachetag, "cachetag=%s"},
75 {Opt_access, "access=%s"},
76 {Opt_err, NULL}
77 };
78
79 /**
80 * v9fs_parse_options - parse mount options into session structure
81 * @v9ses: existing v9fs session information
82 *
83 * Return 0 upon success, -ERRNO upon failure.
84 */
85
86 static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
87 {
88 char *options, *tmp_options;
89 substring_t args[MAX_OPT_ARGS];
90 char *p;
91 int option = 0;
92 char *s, *e;
93 int ret = 0;
94
95 /* setup defaults */
96 v9ses->afid = ~0;
97 v9ses->debug = 0;
98 v9ses->cache = 0;
99 #ifdef CONFIG_9P_FSCACHE
100 v9ses->cachetag = NULL;
101 #endif
102
103 if (!opts)
104 return 0;
105
106 tmp_options = kstrdup(opts, GFP_KERNEL);
107 if (!tmp_options) {
108 ret = -ENOMEM;
109 goto fail_option_alloc;
110 }
111 options = tmp_options;
112
113 while ((p = strsep(&options, ",")) != NULL) {
114 int token;
115 if (!*p)
116 continue;
117 token = match_token(p, tokens, args);
118 if (token < Opt_uname) {
119 int r = match_int(&args[0], &option);
120 if (r < 0) {
121 P9_DPRINTK(P9_DEBUG_ERROR,
122 "integer field, but no integer?\n");
123 ret = r;
124 continue;
125 }
126 }
127 switch (token) {
128 case Opt_debug:
129 v9ses->debug = option;
130 #ifdef CONFIG_NET_9P_DEBUG
131 p9_debug_level = option;
132 #endif
133 break;
134
135 case Opt_dfltuid:
136 v9ses->dfltuid = option;
137 break;
138 case Opt_dfltgid:
139 v9ses->dfltgid = option;
140 break;
141 case Opt_afid:
142 v9ses->afid = option;
143 break;
144 case Opt_uname:
145 match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
146 break;
147 case Opt_remotename:
148 match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
149 break;
150 case Opt_nodevmap:
151 v9ses->nodev = 1;
152 break;
153 case Opt_cache_loose:
154 v9ses->cache = CACHE_LOOSE;
155 break;
156 case Opt_fscache:
157 v9ses->cache = CACHE_FSCACHE;
158 break;
159 case Opt_cachetag:
160 #ifdef CONFIG_9P_FSCACHE
161 v9ses->cachetag = match_strdup(&args[0]);
162 #endif
163 break;
164 case Opt_cache:
165 s = match_strdup(&args[0]);
166 if (!s) {
167 ret = -ENOMEM;
168 P9_DPRINTK(P9_DEBUG_ERROR,
169 "problem allocating copy of cache arg\n");
170 goto free_and_return;
171 }
172
173 if (strcmp(s, "loose") == 0)
174 v9ses->cache = CACHE_LOOSE;
175 else if (strcmp(s, "fscache") == 0)
176 v9ses->cache = CACHE_FSCACHE;
177 else
178 v9ses->cache = CACHE_NONE;
179 kfree(s);
180 break;
181
182 case Opt_access:
183 s = match_strdup(&args[0]);
184 if (!s) {
185 ret = -ENOMEM;
186 P9_DPRINTK(P9_DEBUG_ERROR,
187 "problem allocating copy of access arg\n");
188 goto free_and_return;
189 }
190
191 v9ses->flags &= ~V9FS_ACCESS_MASK;
192 if (strcmp(s, "user") == 0)
193 v9ses->flags |= V9FS_ACCESS_USER;
194 else if (strcmp(s, "any") == 0)
195 v9ses->flags |= V9FS_ACCESS_ANY;
196 else {
197 v9ses->flags |= V9FS_ACCESS_SINGLE;
198 v9ses->uid = simple_strtoul(s, &e, 10);
199 if (*e != '\0')
200 v9ses->uid = ~0;
201 }
202 kfree(s);
203 break;
204
205 default:
206 continue;
207 }
208 }
209
210 free_and_return:
211 kfree(tmp_options);
212 fail_option_alloc:
213 return ret;
214 }
215
216 /**
217 * v9fs_session_init - initialize session
218 * @v9ses: session information structure
219 * @dev_name: device being mounted
220 * @data: options
221 *
222 */
223
224 struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
225 const char *dev_name, char *data)
226 {
227 int retval = -EINVAL;
228 struct p9_fid *fid;
229 int rc;
230
231 v9ses->uname = __getname();
232 if (!v9ses->uname)
233 return ERR_PTR(-ENOMEM);
234
235 v9ses->aname = __getname();
236 if (!v9ses->aname) {
237 __putname(v9ses->uname);
238 return ERR_PTR(-ENOMEM);
239 }
240 init_rwsem(&v9ses->rename_sem);
241
242 rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
243 if (rc) {
244 __putname(v9ses->aname);
245 __putname(v9ses->uname);
246 return ERR_PTR(rc);
247 }
248
249 spin_lock(&v9fs_sessionlist_lock);
250 list_add(&v9ses->slist, &v9fs_sessionlist);
251 spin_unlock(&v9fs_sessionlist_lock);
252
253 v9ses->flags = V9FS_ACCESS_USER;
254 strcpy(v9ses->uname, V9FS_DEFUSER);
255 strcpy(v9ses->aname, V9FS_DEFANAME);
256 v9ses->uid = ~0;
257 v9ses->dfltuid = V9FS_DEFUID;
258 v9ses->dfltgid = V9FS_DEFGID;
259
260 rc = v9fs_parse_options(v9ses, data);
261 if (rc < 0) {
262 retval = rc;
263 goto error;
264 }
265
266 v9ses->clnt = p9_client_create(dev_name, data);
267 if (IS_ERR(v9ses->clnt)) {
268 retval = PTR_ERR(v9ses->clnt);
269 v9ses->clnt = NULL;
270 P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
271 goto error;
272 }
273
274 if (p9_is_proto_dotl(v9ses->clnt))
275 v9ses->flags |= V9FS_PROTO_2000L;
276 else if (p9_is_proto_dotu(v9ses->clnt))
277 v9ses->flags |= V9FS_PROTO_2000U;
278
279 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
280
281 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
282 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
283 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
284
285 v9ses->flags &= ~V9FS_ACCESS_MASK;
286 v9ses->flags |= V9FS_ACCESS_ANY;
287 v9ses->uid = ~0;
288 }
289
290 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
291 v9ses->aname);
292 if (IS_ERR(fid)) {
293 retval = PTR_ERR(fid);
294 fid = NULL;
295 P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
296 goto error;
297 }
298
299 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
300 fid->uid = v9ses->uid;
301 else
302 fid->uid = ~0;
303
304 #ifdef CONFIG_9P_FSCACHE
305 /* register the session for caching */
306 v9fs_cache_session_get_cookie(v9ses);
307 #endif
308
309 return fid;
310
311 error:
312 bdi_destroy(&v9ses->bdi);
313 return ERR_PTR(retval);
314 }
315
316 /**
317 * v9fs_session_close - shutdown a session
318 * @v9ses: session information structure
319 *
320 */
321
322 void v9fs_session_close(struct v9fs_session_info *v9ses)
323 {
324 if (v9ses->clnt) {
325 p9_client_destroy(v9ses->clnt);
326 v9ses->clnt = NULL;
327 }
328
329 #ifdef CONFIG_9P_FSCACHE
330 if (v9ses->fscache) {
331 v9fs_cache_session_put_cookie(v9ses);
332 kfree(v9ses->cachetag);
333 }
334 #endif
335 __putname(v9ses->uname);
336 __putname(v9ses->aname);
337
338 bdi_destroy(&v9ses->bdi);
339
340 spin_lock(&v9fs_sessionlist_lock);
341 list_del(&v9ses->slist);
342 spin_unlock(&v9fs_sessionlist_lock);
343 }
344
345 /**
346 * v9fs_session_cancel - terminate a session
347 * @v9ses: session to terminate
348 *
349 * mark transport as disconnected and cancel all pending requests.
350 */
351
352 void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
353 P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
354 p9_client_disconnect(v9ses->clnt);
355 }
356
357 /**
358 * v9fs_session_begin_cancel - Begin terminate of a session
359 * @v9ses: session to terminate
360 *
361 * After this call we don't allow any request other than clunk.
362 */
363
364 void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
365 {
366 P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
367 p9_client_begin_disconnect(v9ses->clnt);
368 }
369
370 extern int v9fs_error_init(void);
371
372 static struct kobject *v9fs_kobj;
373
374 #ifdef CONFIG_9P_FSCACHE
375 /**
376 * caches_show - list caches associated with a session
377 *
378 * Returns the size of buffer written.
379 */
380
381 static ssize_t caches_show(struct kobject *kobj,
382 struct kobj_attribute *attr,
383 char *buf)
384 {
385 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
386 struct v9fs_session_info *v9ses;
387
388 spin_lock(&v9fs_sessionlist_lock);
389 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
390 if (v9ses->cachetag) {
391 n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
392 if (n < 0) {
393 count = n;
394 break;
395 }
396
397 count += n;
398 limit -= n;
399 }
400 }
401
402 spin_unlock(&v9fs_sessionlist_lock);
403 return count;
404 }
405
406 static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
407 #endif /* CONFIG_9P_FSCACHE */
408
409 static struct attribute *v9fs_attrs[] = {
410 #ifdef CONFIG_9P_FSCACHE
411 &v9fs_attr_cache.attr,
412 #endif
413 NULL,
414 };
415
416 static struct attribute_group v9fs_attr_group = {
417 .attrs = v9fs_attrs,
418 };
419
420 /**
421 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
422 *
423 */
424
425 static int v9fs_sysfs_init(void)
426 {
427 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
428 if (!v9fs_kobj)
429 return -ENOMEM;
430
431 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
432 kobject_put(v9fs_kobj);
433 return -ENOMEM;
434 }
435
436 return 0;
437 }
438
439 /**
440 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
441 *
442 */
443
444 static void v9fs_sysfs_cleanup(void)
445 {
446 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
447 kobject_put(v9fs_kobj);
448 }
449
450 /**
451 * init_v9fs - Initialize module
452 *
453 */
454
455 static int __init init_v9fs(void)
456 {
457 int err;
458 printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
459 /* TODO: Setup list of registered trasnport modules */
460 err = register_filesystem(&v9fs_fs_type);
461 if (err < 0) {
462 printk(KERN_ERR "Failed to register filesystem\n");
463 return err;
464 }
465
466 err = v9fs_cache_register();
467 if (err < 0) {
468 printk(KERN_ERR "Failed to register v9fs for caching\n");
469 goto out_fs_unreg;
470 }
471
472 err = v9fs_sysfs_init();
473 if (err < 0) {
474 printk(KERN_ERR "Failed to register with sysfs\n");
475 goto out_sysfs_cleanup;
476 }
477
478 return 0;
479
480 out_sysfs_cleanup:
481 v9fs_sysfs_cleanup();
482
483 out_fs_unreg:
484 unregister_filesystem(&v9fs_fs_type);
485
486 return err;
487 }
488
489 /**
490 * exit_v9fs - shutdown module
491 *
492 */
493
494 static void __exit exit_v9fs(void)
495 {
496 v9fs_sysfs_cleanup();
497 v9fs_cache_unregister();
498 unregister_filesystem(&v9fs_fs_type);
499 }
500
501 module_init(init_v9fs)
502 module_exit(exit_v9fs)
503
504 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
505 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
506 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
507 MODULE_LICENSE("GPL");
Tomato firmware and modifications.