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 | * | |
6 | * Copyright (C) 2004 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 | |
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 LI |
32 | #include <net/9p/9p.h> |
33 | #include <net/9p/transport.h> | |
34 | #include <net/9p/conn.h> | |
35 | #include <net/9p/client.h> | |
9e82cf6a | 36 | #include "v9fs.h" |
9e82cf6a | 37 | #include "v9fs_vfs.h" |
9e82cf6a EVH |
38 | |
39 | /* | |
40 | * Option Parsing (code inspired by NFS code) | |
a80d923e | 41 | * NOTE: each transport will parse its own options |
9e82cf6a EVH |
42 | */ |
43 | ||
44 | enum { | |
45 | /* Options that take integer arguments */ | |
bd32b82d | 46 | Opt_debug, Opt_msize, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
9e82cf6a | 47 | /* String options */ |
a80d923e | 48 | Opt_uname, Opt_remotename, Opt_trans, |
9e82cf6a | 49 | /* Options that take no arguments */ |
a80d923e | 50 | Opt_legacy, Opt_nodevmap, |
e03abc0c EVH |
51 | /* Cache options */ |
52 | Opt_cache_loose, | |
ba17674f LI |
53 | /* Access options */ |
54 | Opt_access, | |
9e82cf6a EVH |
55 | /* Error token */ |
56 | Opt_err | |
57 | }; | |
58 | ||
59 | static match_table_t tokens = { | |
9e2f6688 | 60 | {Opt_debug, "debug=%x"}, |
9e82cf6a | 61 | {Opt_msize, "msize=%u"}, |
bd32b82d LI |
62 | {Opt_dfltuid, "dfltuid=%u"}, |
63 | {Opt_dfltgid, "dfltgid=%u"}, | |
9e82cf6a | 64 | {Opt_afid, "afid=%u"}, |
67543e50 | 65 | {Opt_uname, "uname=%s"}, |
9e82cf6a | 66 | {Opt_remotename, "aname=%s"}, |
a80d923e | 67 | {Opt_trans, "trans=%s"}, |
9e82cf6a EVH |
68 | {Opt_legacy, "noextend"}, |
69 | {Opt_nodevmap, "nodevmap"}, | |
e03abc0c EVH |
70 | {Opt_cache_loose, "cache=loose"}, |
71 | {Opt_cache_loose, "loose"}, | |
ba17674f | 72 | {Opt_access, "access=%s"}, |
9e82cf6a EVH |
73 | {Opt_err, NULL} |
74 | }; | |
75 | ||
9e82cf6a EVH |
76 | /** |
77 | * v9fs_parse_options - parse mount options into session structure | |
78 | * @options: options string passed from mount | |
79 | * @v9ses: existing v9fs session information | |
80 | * | |
81 | */ | |
82 | ||
a80d923e | 83 | static void v9fs_parse_options(struct v9fs_session_info *v9ses) |
9e82cf6a | 84 | { |
a80d923e | 85 | char *options = v9ses->options; |
9e82cf6a | 86 | substring_t args[MAX_OPT_ARGS]; |
a80d923e | 87 | char *p; |
9e82cf6a EVH |
88 | int option; |
89 | int ret; | |
ba17674f | 90 | char *s, *e; |
9e82cf6a EVH |
91 | |
92 | /* setup defaults */ | |
a80d923e | 93 | v9ses->maxdata = 8192; |
9e82cf6a EVH |
94 | v9ses->afid = ~0; |
95 | v9ses->debug = 0; | |
e03abc0c | 96 | v9ses->cache = 0; |
fb0466c3 | 97 | v9ses->trans = v9fs_default_trans(); |
9e82cf6a EVH |
98 | |
99 | if (!options) | |
100 | return; | |
101 | ||
102 | while ((p = strsep(&options, ",")) != NULL) { | |
103 | int token; | |
104 | if (!*p) | |
105 | continue; | |
106 | token = match_token(p, tokens, args); | |
67543e50 | 107 | if (token < Opt_uname) { |
9e82cf6a | 108 | if ((ret = match_int(&args[0], &option)) < 0) { |
bd238fb4 | 109 | P9_DPRINTK(P9_DEBUG_ERROR, |
9e82cf6a EVH |
110 | "integer field, but no integer?\n"); |
111 | continue; | |
112 | } | |
9e82cf6a EVH |
113 | } |
114 | switch (token) { | |
9e2f6688 EVH |
115 | case Opt_debug: |
116 | v9ses->debug = option; | |
10fa16e7 | 117 | #ifdef CONFIG_NET_9P_DEBUG |
9e2f6688 | 118 | p9_debug_level = option; |
10fa16e7 | 119 | #endif |
9e2f6688 | 120 | break; |
9e82cf6a EVH |
121 | case Opt_msize: |
122 | v9ses->maxdata = option; | |
123 | break; | |
bd32b82d LI |
124 | case Opt_dfltuid: |
125 | v9ses->dfltuid = option; | |
9e82cf6a | 126 | break; |
bd32b82d LI |
127 | case Opt_dfltgid: |
128 | v9ses->dfltgid = option; | |
9e82cf6a EVH |
129 | break; |
130 | case Opt_afid: | |
131 | v9ses->afid = option; | |
132 | break; | |
a80d923e EVH |
133 | case Opt_trans: |
134 | v9ses->trans = v9fs_match_trans(&args[0]); | |
9e82cf6a | 135 | break; |
67543e50 | 136 | case Opt_uname: |
ba17674f | 137 | match_strcpy(v9ses->uname, &args[0]); |
9e82cf6a EVH |
138 | break; |
139 | case Opt_remotename: | |
ba17674f | 140 | match_strcpy(v9ses->aname, &args[0]); |
9e82cf6a EVH |
141 | break; |
142 | case Opt_legacy: | |
2405669b | 143 | v9ses->flags &= ~V9FS_EXTENDED; |
9e82cf6a EVH |
144 | break; |
145 | case Opt_nodevmap: | |
146 | v9ses->nodev = 1; | |
147 | break; | |
e03abc0c EVH |
148 | case Opt_cache_loose: |
149 | v9ses->cache = CACHE_LOOSE; | |
150 | break; | |
ba17674f LI |
151 | |
152 | case Opt_access: | |
153 | s = match_strdup(&args[0]); | |
154 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
155 | if (strcmp(s, "user") == 0) | |
156 | v9ses->flags |= V9FS_ACCESS_USER; | |
157 | else if (strcmp(s, "any") == 0) | |
158 | v9ses->flags |= V9FS_ACCESS_ANY; | |
159 | else { | |
160 | v9ses->flags |= V9FS_ACCESS_SINGLE; | |
161 | v9ses->uid = simple_strtol(s, &e, 10); | |
162 | if (*e != '\0') | |
163 | v9ses->uid = ~0; | |
164 | } | |
165 | break; | |
166 | ||
9e82cf6a EVH |
167 | default: |
168 | continue; | |
169 | } | |
170 | } | |
171 | } | |
172 | ||
9e82cf6a EVH |
173 | /** |
174 | * v9fs_session_init - initialize session | |
175 | * @v9ses: session information structure | |
176 | * @dev_name: device being mounted | |
177 | * @data: options | |
178 | * | |
179 | */ | |
180 | ||
bd238fb4 | 181 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
182 | const char *dev_name, char *data) |
183 | { | |
9e82cf6a | 184 | int retval = -EINVAL; |
a80d923e | 185 | struct p9_trans *trans = NULL; |
bd238fb4 | 186 | struct p9_fid *fid; |
9e82cf6a | 187 | |
ba17674f LI |
188 | v9ses->uname = __getname(); |
189 | if (!v9ses->uname) | |
bd238fb4 | 190 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 191 | |
ba17674f LI |
192 | v9ses->aname = __getname(); |
193 | if (!v9ses->aname) { | |
194 | __putname(v9ses->uname); | |
bd238fb4 | 195 | return ERR_PTR(-ENOMEM); |
9e82cf6a EVH |
196 | } |
197 | ||
ba17674f LI |
198 | v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER; |
199 | strcpy(v9ses->uname, V9FS_DEFUSER); | |
200 | strcpy(v9ses->aname, V9FS_DEFANAME); | |
201 | v9ses->uid = ~0; | |
bd32b82d LI |
202 | v9ses->dfltuid = V9FS_DEFUID; |
203 | v9ses->dfltgid = V9FS_DEFGID; | |
a80d923e EVH |
204 | v9ses->options = kstrdup(data, GFP_KERNEL); |
205 | v9fs_parse_options(v9ses); | |
206 | ||
a80d923e EVH |
207 | if (v9ses->trans == NULL) { |
208 | retval = -EPROTONOSUPPORT; | |
209 | P9_DPRINTK(P9_DEBUG_ERROR, | |
210 | "No transport defined or default transport\n"); | |
bd238fb4 | 211 | goto error; |
a80d923e | 212 | } |
9e82cf6a | 213 | |
a80d923e | 214 | trans = v9ses->trans->create(dev_name, v9ses->options); |
bd238fb4 LI |
215 | if (IS_ERR(trans)) { |
216 | retval = PTR_ERR(trans); | |
217 | trans = NULL; | |
218 | goto error; | |
a8e63bff | 219 | } |
a80d923e EVH |
220 | if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize) |
221 | v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ; | |
a8e63bff | 222 | |
a80d923e | 223 | v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ, |
2405669b | 224 | v9fs_extended(v9ses)); |
9e82cf6a | 225 | |
bd238fb4 LI |
226 | if (IS_ERR(v9ses->clnt)) { |
227 | retval = PTR_ERR(v9ses->clnt); | |
228 | v9ses->clnt = NULL; | |
229 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); | |
230 | goto error; | |
9e82cf6a EVH |
231 | } |
232 | ||
ba17674f LI |
233 | if (!v9ses->clnt->dotu) |
234 | v9ses->flags &= ~V9FS_EXTENDED; | |
235 | ||
236 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ | |
237 | if (!v9fs_extended(v9ses) && | |
238 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { | |
239 | ||
240 | v9ses->flags &= ~V9FS_ACCESS_MASK; | |
241 | v9ses->flags |= V9FS_ACCESS_ANY; | |
242 | v9ses->uid = ~0; | |
243 | } | |
244 | ||
245 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, | |
246 | v9ses->aname); | |
bd238fb4 LI |
247 | if (IS_ERR(fid)) { |
248 | retval = PTR_ERR(fid); | |
249 | fid = NULL; | |
250 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); | |
251 | goto error; | |
9e82cf6a EVH |
252 | } |
253 | ||
ba17674f LI |
254 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
255 | fid->uid = v9ses->uid; | |
256 | else | |
257 | fid->uid = ~0; | |
258 | ||
bd238fb4 | 259 | return fid; |
9e82cf6a | 260 | |
bd238fb4 | 261 | error: |
9e82cf6a | 262 | v9fs_session_close(v9ses); |
bd238fb4 | 263 | return ERR_PTR(retval); |
9e82cf6a EVH |
264 | } |
265 | ||
266 | /** | |
267 | * v9fs_session_close - shutdown a session | |
268 | * @v9ses: session information structure | |
269 | * | |
270 | */ | |
271 | ||
272 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
273 | { | |
bd238fb4 LI |
274 | if (v9ses->clnt) { |
275 | p9_client_destroy(v9ses->clnt); | |
276 | v9ses->clnt = NULL; | |
3cf6429a | 277 | } |
9e82cf6a | 278 | |
ba17674f LI |
279 | __putname(v9ses->uname); |
280 | __putname(v9ses->aname); | |
a80d923e | 281 | kfree(v9ses->options); |
9e82cf6a EVH |
282 | } |
283 | ||
322b329a EVH |
284 | /** |
285 | * v9fs_session_cancel - mark transport as disconnected | |
286 | * and cancel all pending requests. | |
287 | */ | |
288 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { | |
bd238fb4 LI |
289 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
290 | p9_client_disconnect(v9ses->clnt); | |
322b329a EVH |
291 | } |
292 | ||
9e82cf6a EVH |
293 | extern int v9fs_error_init(void); |
294 | ||
295 | /** | |
296 | * v9fs_init - Initialize module | |
297 | * | |
298 | */ | |
299 | ||
300 | static int __init init_v9fs(void) | |
301 | { | |
f94b3470 | 302 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
a80d923e | 303 | /* TODO: Setup list of registered trasnport modules */ |
bd238fb4 | 304 | return register_filesystem(&v9fs_fs_type); |
9e82cf6a EVH |
305 | } |
306 | ||
307 | /** | |
308 | * v9fs_init - shutdown module | |
309 | * | |
310 | */ | |
311 | ||
312 | static void __exit exit_v9fs(void) | |
313 | { | |
314 | unregister_filesystem(&v9fs_fs_type); | |
315 | } | |
316 | ||
317 | module_init(init_v9fs) | |
318 | module_exit(exit_v9fs) | |
319 | ||
bd238fb4 | 320 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
321 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
322 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
323 | MODULE_LICENSE("GPL"); |