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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> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
bd238fb4 | 33 | #include <net/9p/9p.h> |
bd238fb4 | 34 | #include <net/9p/client.h> |
8b81ef58 | 35 | #include <net/9p/transport.h> |
9e82cf6a | 36 | #include "v9fs.h" |
9e82cf6a | 37 | #include "v9fs_vfs.h" |
60e78d2c AK |
38 | #include "cache.h" |
39 | ||
40 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); | |
41 | static LIST_HEAD(v9fs_sessionlist); | |
9e82cf6a EVH |
42 | |
43 | /* | |
60e78d2c AK |
44 | * Option Parsing (code inspired by NFS code) |
45 | * NOTE: each transport will parse its own options | |
46 | */ | |
9e82cf6a EVH |
47 | |
48 | enum { | |
49 | /* Options that take integer arguments */ | |
8a0dc95f | 50 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
9e82cf6a | 51 | /* String options */ |
60e78d2c | 52 | Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag, |
9e82cf6a | 53 | /* Options that take no arguments */ |
8a0dc95f | 54 | Opt_nodevmap, |
e03abc0c | 55 | /* Cache options */ |
60e78d2c | 56 | Opt_cache_loose, Opt_fscache, |
ba17674f LI |
57 | /* Access options */ |
58 | Opt_access, | |
9e82cf6a EVH |
59 | /* Error token */ |
60 | Opt_err | |
61 | }; | |
62 | ||
a447c093 | 63 | static const match_table_t tokens = { |
9e2f6688 | 64 | {Opt_debug, "debug=%x"}, |
bd32b82d LI |
65 | {Opt_dfltuid, "dfltuid=%u"}, |
66 | {Opt_dfltgid, "dfltgid=%u"}, | |
9e82cf6a | 67 | {Opt_afid, "afid=%u"}, |
67543e50 | 68 | {Opt_uname, "uname=%s"}, |
9e82cf6a | 69 | {Opt_remotename, "aname=%s"}, |
9e82cf6a | 70 | {Opt_nodevmap, "nodevmap"}, |
60e78d2c | 71 | {Opt_cache, "cache=%s"}, |
e03abc0c | 72 | {Opt_cache_loose, "loose"}, |
60e78d2c AK |
73 | {Opt_fscache, "fscache"}, |
74 | {Opt_cachetag, "cachetag=%s"}, | |
ba17674f | 75 | {Opt_access, "access=%s"}, |
9e82cf6a EVH |
76 | {Opt_err, NULL} |
77 | }; | |
78 | ||
9e82cf6a EVH |
79 | /** |
80 | * v9fs_parse_options - parse mount options into session structure | |
9e82cf6a EVH |
81 | * @v9ses: existing v9fs session information |
82 | * | |
ab31267d | 83 | * Return 0 upon success, -ERRNO upon failure. |
9e82cf6a EVH |
84 | */ |
85 | ||
4b53e4b5 | 86 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
9e82cf6a | 87 | { |
d8c8a9e3 | 88 | char *options, *tmp_options; |
9e82cf6a | 89 | substring_t args[MAX_OPT_ARGS]; |
a80d923e | 90 | char *p; |
8a0dc95f | 91 | int option = 0; |
ba17674f | 92 | char *s, *e; |
ab31267d | 93 | int ret = 0; |
9e82cf6a EVH |
94 | |
95 | /* setup defaults */ | |
9e82cf6a EVH |
96 | v9ses->afid = ~0; |
97 | v9ses->debug = 0; | |
e03abc0c | 98 | v9ses->cache = 0; |
60e78d2c AK |
99 | #ifdef CONFIG_9P_FSCACHE |
100 | v9ses->cachetag = NULL; | |
101 | #endif | |
9e82cf6a | 102 | |
4b53e4b5 | 103 | if (!opts) |
ab31267d | 104 | return 0; |
9e82cf6a | 105 | |
d8c8a9e3 | 106 | tmp_options = kstrdup(opts, GFP_KERNEL); |
bf2d29c6 EVH |
107 | if (!tmp_options) { |
108 | ret = -ENOMEM; | |
60e78d2c | 109 | goto fail_option_alloc; |
bf2d29c6 | 110 | } |
d8c8a9e3 | 111 | options = tmp_options; |
ab31267d | 112 | |
9e82cf6a EVH |
113 | while ((p = strsep(&options, ",")) != NULL) { |
114 | int token; | |
115 | if (!*p) | |
116 | continue; | |
117 | token = match_token(p, tokens, args); | |
67543e50 | 118 | if (token < Opt_uname) { |
ab31267d JM |
119 | int r = match_int(&args[0], &option); |
120 | if (r < 0) { | |
bd238fb4 | 121 | P9_DPRINTK(P9_DEBUG_ERROR, |
9e82cf6a | 122 | "integer field, but no integer?\n"); |
ab31267d | 123 | ret = r; |
9e82cf6a EVH |
124 | continue; |
125 | } | |
9e82cf6a EVH |
126 | } |
127 | switch (token) { | |
9e2f6688 EVH |
128 | case Opt_debug: |
129 | v9ses->debug = option; | |
10fa16e7 | 130 | #ifdef CONFIG_NET_9P_DEBUG |
9e2f6688 | 131 | p9_debug_level = option; |
10fa16e7 | 132 | #endif |
9e2f6688 | 133 | break; |
8a0dc95f | 134 | |
bd32b82d LI |
135 | case Opt_dfltuid: |
136 | v9ses->dfltuid = option; | |
9e82cf6a | 137 | break; |
bd32b82d LI |
138 | case Opt_dfltgid: |
139 | v9ses->dfltgid = option; | |
9e82cf6a EVH |
140 | break; |
141 | case Opt_afid: | |
142 | v9ses->afid = option; | |
143 | break; | |
67543e50 | 144 | case Opt_uname: |
b32a09db | 145 | match_strlcpy(v9ses->uname, &args[0], PATH_MAX); |
9e82cf6a EVH |
146 | break; |
147 | case Opt_remotename: | |
b32a09db | 148 | match_strlcpy(v9ses->aname, &args[0], PATH_MAX); |
9e82cf6a | 149 | break; |
9e82cf6a EVH |
150 | case Opt_nodevmap: |
151 | v9ses->nodev = 1; | |
152 | break; | |
e03abc0c EVH |
153 | case Opt_cache_loose: |
154 | v9ses->cache = CACHE_LOOSE; | |
155 | break; | |
60e78d2c AK |
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]); | |
bf2d29c6 EVH |
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 | } | |
60e78d2c AK |
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; | |
ba17674f LI |
181 | |
182 | case Opt_access: | |
183 | s = match_strdup(&args[0]); | |
bf2d29c6 EVH |
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 | } | |
60e78d2c | 190 | |
ba17674f LI |
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; | |
f1d9e458 | 198 | v9ses->uid = simple_strtoul(s, &e, 10); |
ba17674f LI |
199 | if (*e != '\0') |
200 | v9ses->uid = ~0; | |
201 | } | |
0a976297 | 202 | kfree(s); |
ba17674f LI |
203 | break; |
204 | ||
9e82cf6a EVH |
205 | default: |
206 | continue; | |
207 | } | |
208 | } | |
d8c8a9e3 | 209 | |
bf2d29c6 | 210 | free_and_return: |
d8c8a9e3 | 211 | kfree(tmp_options); |
60e78d2c | 212 | fail_option_alloc: |
bf2d29c6 | 213 | return ret; |
9e82cf6a EVH |
214 | } |
215 | ||
9e82cf6a EVH |
216 | /** |
217 | * v9fs_session_init - initialize session | |
218 | * @v9ses: session information structure | |
219 | * @dev_name: device being mounted | |
220 | * @data: options | |
221 | * | |
222 | */ | |
223 | ||
bd238fb4 | 224 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
225 | const char *dev_name, char *data) |
226 | { | |
9e82cf6a | 227 | int retval = -EINVAL; |
bd238fb4 | 228 | struct p9_fid *fid; |
ab31267d | 229 | int rc; |
9e82cf6a | 230 | |
ba17674f LI |
231 | v9ses->uname = __getname(); |
232 | if (!v9ses->uname) | |
bd238fb4 | 233 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 234 | |
ba17674f LI |
235 | v9ses->aname = __getname(); |
236 | if (!v9ses->aname) { | |
237 | __putname(v9ses->uname); | |
bd238fb4 | 238 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 239 | } |
a534c8d1 | 240 | init_rwsem(&v9ses->rename_sem); |
9e82cf6a | 241 | |
0ed07ddb JA |
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 | ||
60e78d2c AK |
249 | spin_lock(&v9fs_sessionlist_lock); |
250 | list_add(&v9ses->slist, &v9fs_sessionlist); | |
251 | spin_unlock(&v9fs_sessionlist_lock); | |
252 | ||
476ada04 | 253 | v9ses->flags = V9FS_ACCESS_USER; |
ba17674f LI |
254 | strcpy(v9ses->uname, V9FS_DEFUSER); |
255 | strcpy(v9ses->aname, V9FS_DEFANAME); | |
256 | v9ses->uid = ~0; | |
bd32b82d LI |
257 | v9ses->dfltuid = V9FS_DEFUID; |
258 | v9ses->dfltgid = V9FS_DEFGID; | |
ab31267d | 259 | |
4b53e4b5 | 260 | rc = v9fs_parse_options(v9ses, data); |
ab31267d JM |
261 | if (rc < 0) { |
262 | retval = rc; | |
263 | goto error; | |
264 | } | |
a80d923e | 265 | |
4b53e4b5 | 266 | v9ses->clnt = p9_client_create(dev_name, data); |
bd238fb4 LI |
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; | |
9e82cf6a EVH |
272 | } |
273 | ||
476ada04 SK |
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; | |
ba17674f | 278 | |
fbedadc1 | 279 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
8a0dc95f | 280 | |
ba17674f | 281 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
9ffaf63e | 282 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
ba17674f LI |
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); | |
bd238fb4 LI |
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; | |
9e82cf6a EVH |
297 | } |
298 | ||
ba17674f LI |
299 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
300 | fid->uid = v9ses->uid; | |
301 | else | |
302 | fid->uid = ~0; | |
303 | ||
60e78d2c AK |
304 | #ifdef CONFIG_9P_FSCACHE |
305 | /* register the session for caching */ | |
306 | v9fs_cache_session_get_cookie(v9ses); | |
307 | #endif | |
308 | ||
bd238fb4 | 309 | return fid; |
9e82cf6a | 310 | |
bd238fb4 | 311 | error: |
0ed07ddb | 312 | bdi_destroy(&v9ses->bdi); |
bd238fb4 | 313 | return ERR_PTR(retval); |
9e82cf6a EVH |
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 | { | |
bd238fb4 LI |
324 | if (v9ses->clnt) { |
325 | p9_client_destroy(v9ses->clnt); | |
326 | v9ses->clnt = NULL; | |
3cf6429a | 327 | } |
9e82cf6a | 328 | |
60e78d2c AK |
329 | #ifdef CONFIG_9P_FSCACHE |
330 | if (v9ses->fscache) { | |
331 | v9fs_cache_session_put_cookie(v9ses); | |
332 | kfree(v9ses->cachetag); | |
333 | } | |
334 | #endif | |
ba17674f LI |
335 | __putname(v9ses->uname); |
336 | __putname(v9ses->aname); | |
60e78d2c | 337 | |
0ed07ddb JA |
338 | bdi_destroy(&v9ses->bdi); |
339 | ||
60e78d2c AK |
340 | spin_lock(&v9fs_sessionlist_lock); |
341 | list_del(&v9ses->slist); | |
342 | spin_unlock(&v9fs_sessionlist_lock); | |
9e82cf6a EVH |
343 | } |
344 | ||
322b329a | 345 | /** |
ee443996 EVH |
346 | * v9fs_session_cancel - terminate a session |
347 | * @v9ses: session to terminate | |
348 | * | |
349 | * mark transport as disconnected and cancel all pending requests. | |
322b329a | 350 | */ |
ee443996 | 351 | |
322b329a | 352 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
bd238fb4 LI |
353 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
354 | p9_client_disconnect(v9ses->clnt); | |
322b329a EVH |
355 | } |
356 | ||
6d96d3ab AK |
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 | ||
9e82cf6a EVH |
370 | extern int v9fs_error_init(void); |
371 | ||
60e78d2c AK |
372 | static struct kobject *v9fs_kobj; |
373 | ||
374 | #ifdef CONFIG_9P_FSCACHE | |
9e82cf6a | 375 | /** |
60e78d2c AK |
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 | |
9e82cf6a EVH |
452 | * |
453 | */ | |
454 | ||
455 | static int __init init_v9fs(void) | |
456 | { | |
60e78d2c | 457 | int err; |
f94b3470 | 458 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
a80d923e | 459 | /* TODO: Setup list of registered trasnport modules */ |
60e78d2c AK |
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; | |
9e82cf6a EVH |
487 | } |
488 | ||
489 | /** | |
60e78d2c | 490 | * exit_v9fs - shutdown module |
9e82cf6a EVH |
491 | * |
492 | */ | |
493 | ||
494 | static void __exit exit_v9fs(void) | |
495 | { | |
60e78d2c AK |
496 | v9fs_sysfs_cleanup(); |
497 | v9fs_cache_unregister(); | |
9e82cf6a EVH |
498 | unregister_filesystem(&v9fs_fs_type); |
499 | } | |
500 | ||
501 | module_init(init_v9fs) | |
502 | module_exit(exit_v9fs) | |
503 | ||
bd238fb4 | 504 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
505 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
506 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
507 | MODULE_LICENSE("GPL"); |