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) | |
41 | * | |
42 | */ | |
43 | ||
44 | enum { | |
45 | /* Options that take integer arguments */ | |
9e2f6688 | 46 | Opt_debug, Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, |
9e82cf6a EVH |
47 | Opt_rfdno, Opt_wfdno, |
48 | /* String options */ | |
67543e50 | 49 | Opt_uname, Opt_remotename, |
9e82cf6a | 50 | /* Options that take no arguments */ |
bd238fb4 | 51 | Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci, |
e03abc0c EVH |
52 | /* Cache options */ |
53 | Opt_cache_loose, | |
9e82cf6a EVH |
54 | /* Error token */ |
55 | Opt_err | |
56 | }; | |
57 | ||
58 | static match_table_t tokens = { | |
9e2f6688 | 59 | {Opt_debug, "debug=%x"}, |
9e82cf6a EVH |
60 | {Opt_port, "port=%u"}, |
61 | {Opt_msize, "msize=%u"}, | |
62 | {Opt_uid, "uid=%u"}, | |
63 | {Opt_gid, "gid=%u"}, | |
64 | {Opt_afid, "afid=%u"}, | |
65 | {Opt_rfdno, "rfdno=%u"}, | |
66 | {Opt_wfdno, "wfdno=%u"}, | |
67543e50 | 67 | {Opt_uname, "uname=%s"}, |
9e82cf6a EVH |
68 | {Opt_remotename, "aname=%s"}, |
69 | {Opt_unix, "proto=unix"}, | |
70 | {Opt_tcp, "proto=tcp"}, | |
71 | {Opt_fd, "proto=fd"}, | |
bd238fb4 LI |
72 | #ifdef CONFIG_PCI_9P |
73 | {Opt_pci, "proto=pci"}, | |
74 | #endif | |
9e82cf6a EVH |
75 | {Opt_tcp, "tcp"}, |
76 | {Opt_unix, "unix"}, | |
77 | {Opt_fd, "fd"}, | |
78 | {Opt_legacy, "noextend"}, | |
79 | {Opt_nodevmap, "nodevmap"}, | |
e03abc0c EVH |
80 | {Opt_cache_loose, "cache=loose"}, |
81 | {Opt_cache_loose, "loose"}, | |
9e82cf6a EVH |
82 | {Opt_err, NULL} |
83 | }; | |
84 | ||
bd238fb4 LI |
85 | extern struct p9_transport *p9pci_trans_create(void); |
86 | ||
9e82cf6a EVH |
87 | /* |
88 | * Parse option string. | |
89 | */ | |
90 | ||
91 | /** | |
92 | * v9fs_parse_options - parse mount options into session structure | |
93 | * @options: options string passed from mount | |
94 | * @v9ses: existing v9fs session information | |
95 | * | |
96 | */ | |
97 | ||
98 | static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses) | |
99 | { | |
100 | char *p; | |
101 | substring_t args[MAX_OPT_ARGS]; | |
102 | int option; | |
103 | int ret; | |
104 | ||
105 | /* setup defaults */ | |
106 | v9ses->port = V9FS_PORT; | |
107 | v9ses->maxdata = 9000; | |
108 | v9ses->proto = PROTO_TCP; | |
109 | v9ses->extended = 1; | |
110 | v9ses->afid = ~0; | |
111 | v9ses->debug = 0; | |
112 | v9ses->rfdno = ~0; | |
113 | v9ses->wfdno = ~0; | |
e03abc0c | 114 | v9ses->cache = 0; |
9e82cf6a EVH |
115 | |
116 | if (!options) | |
117 | return; | |
118 | ||
119 | while ((p = strsep(&options, ",")) != NULL) { | |
120 | int token; | |
121 | if (!*p) | |
122 | continue; | |
123 | token = match_token(p, tokens, args); | |
67543e50 | 124 | if (token < Opt_uname) { |
9e82cf6a | 125 | if ((ret = match_int(&args[0], &option)) < 0) { |
bd238fb4 | 126 | P9_DPRINTK(P9_DEBUG_ERROR, |
9e82cf6a EVH |
127 | "integer field, but no integer?\n"); |
128 | continue; | |
129 | } | |
9e82cf6a EVH |
130 | } |
131 | switch (token) { | |
9e2f6688 EVH |
132 | case Opt_debug: |
133 | v9ses->debug = option; | |
134 | p9_debug_level = option; | |
135 | break; | |
9e82cf6a EVH |
136 | case Opt_port: |
137 | v9ses->port = option; | |
138 | break; | |
139 | case Opt_msize: | |
140 | v9ses->maxdata = option; | |
141 | break; | |
142 | case Opt_uid: | |
143 | v9ses->uid = option; | |
144 | break; | |
145 | case Opt_gid: | |
146 | v9ses->gid = option; | |
147 | break; | |
148 | case Opt_afid: | |
149 | v9ses->afid = option; | |
150 | break; | |
151 | case Opt_rfdno: | |
152 | v9ses->rfdno = option; | |
153 | break; | |
154 | case Opt_wfdno: | |
155 | v9ses->wfdno = option; | |
156 | break; | |
9e82cf6a EVH |
157 | case Opt_tcp: |
158 | v9ses->proto = PROTO_TCP; | |
159 | break; | |
160 | case Opt_unix: | |
161 | v9ses->proto = PROTO_UNIX; | |
162 | break; | |
bd238fb4 LI |
163 | case Opt_pci: |
164 | v9ses->proto = PROTO_PCI; | |
165 | break; | |
9e82cf6a EVH |
166 | case Opt_fd: |
167 | v9ses->proto = PROTO_FD; | |
168 | break; | |
67543e50 | 169 | case Opt_uname: |
9e82cf6a EVH |
170 | match_strcpy(v9ses->name, &args[0]); |
171 | break; | |
172 | case Opt_remotename: | |
173 | match_strcpy(v9ses->remotename, &args[0]); | |
174 | break; | |
175 | case Opt_legacy: | |
176 | v9ses->extended = 0; | |
177 | break; | |
178 | case Opt_nodevmap: | |
179 | v9ses->nodev = 1; | |
180 | break; | |
e03abc0c EVH |
181 | case Opt_cache_loose: |
182 | v9ses->cache = CACHE_LOOSE; | |
183 | break; | |
9e82cf6a EVH |
184 | default: |
185 | continue; | |
186 | } | |
187 | } | |
188 | } | |
189 | ||
9e82cf6a EVH |
190 | /** |
191 | * v9fs_session_init - initialize session | |
192 | * @v9ses: session information structure | |
193 | * @dev_name: device being mounted | |
194 | * @data: options | |
195 | * | |
196 | */ | |
197 | ||
bd238fb4 | 198 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
9e82cf6a EVH |
199 | const char *dev_name, char *data) |
200 | { | |
9e82cf6a | 201 | int retval = -EINVAL; |
bd238fb4 LI |
202 | struct p9_transport *trans; |
203 | struct p9_fid *fid; | |
9e82cf6a EVH |
204 | |
205 | v9ses->name = __getname(); | |
206 | if (!v9ses->name) | |
bd238fb4 | 207 | return ERR_PTR(-ENOMEM); |
9e82cf6a EVH |
208 | |
209 | v9ses->remotename = __getname(); | |
210 | if (!v9ses->remotename) { | |
ce44eeb6 | 211 | __putname(v9ses->name); |
bd238fb4 | 212 | return ERR_PTR(-ENOMEM); |
9e82cf6a EVH |
213 | } |
214 | ||
215 | strcpy(v9ses->name, V9FS_DEFUSER); | |
216 | strcpy(v9ses->remotename, V9FS_DEFANAME); | |
217 | ||
218 | v9fs_parse_options(data, v9ses); | |
219 | ||
9e82cf6a EVH |
220 | switch (v9ses->proto) { |
221 | case PROTO_TCP: | |
bd238fb4 | 222 | trans = p9_trans_create_tcp(dev_name, v9ses->port); |
9e82cf6a EVH |
223 | break; |
224 | case PROTO_UNIX: | |
bd238fb4 | 225 | trans = p9_trans_create_unix(dev_name); |
9e82cf6a EVH |
226 | *v9ses->remotename = 0; |
227 | break; | |
228 | case PROTO_FD: | |
bd238fb4 LI |
229 | trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno); |
230 | *v9ses->remotename = 0; | |
231 | break; | |
232 | #ifdef CONFIG_PCI_9P | |
233 | case PROTO_PCI: | |
234 | trans = p9pci_trans_create(); | |
9e82cf6a | 235 | *v9ses->remotename = 0; |
9e82cf6a | 236 | break; |
bd238fb4 | 237 | #endif |
9e82cf6a EVH |
238 | default: |
239 | printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto); | |
240 | retval = -ENOPROTOOPT; | |
bd238fb4 | 241 | goto error; |
9e82cf6a EVH |
242 | }; |
243 | ||
bd238fb4 LI |
244 | if (IS_ERR(trans)) { |
245 | retval = PTR_ERR(trans); | |
246 | trans = NULL; | |
247 | goto error; | |
a8e63bff LI |
248 | } |
249 | ||
bd238fb4 LI |
250 | v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ, |
251 | v9ses->extended); | |
9e82cf6a | 252 | |
bd238fb4 LI |
253 | if (IS_ERR(v9ses->clnt)) { |
254 | retval = PTR_ERR(v9ses->clnt); | |
255 | v9ses->clnt = NULL; | |
256 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); | |
257 | goto error; | |
9e82cf6a EVH |
258 | } |
259 | ||
bd238fb4 LI |
260 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name, |
261 | v9ses->remotename); | |
262 | if (IS_ERR(fid)) { | |
263 | retval = PTR_ERR(fid); | |
264 | fid = NULL; | |
265 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); | |
266 | goto error; | |
9e82cf6a EVH |
267 | } |
268 | ||
bd238fb4 | 269 | return fid; |
9e82cf6a | 270 | |
bd238fb4 | 271 | error: |
9e82cf6a | 272 | v9fs_session_close(v9ses); |
bd238fb4 | 273 | return ERR_PTR(retval); |
9e82cf6a EVH |
274 | } |
275 | ||
276 | /** | |
277 | * v9fs_session_close - shutdown a session | |
278 | * @v9ses: session information structure | |
279 | * | |
280 | */ | |
281 | ||
282 | void v9fs_session_close(struct v9fs_session_info *v9ses) | |
283 | { | |
bd238fb4 LI |
284 | if (v9ses->clnt) { |
285 | p9_client_destroy(v9ses->clnt); | |
286 | v9ses->clnt = NULL; | |
3cf6429a | 287 | } |
9e82cf6a | 288 | |
ce44eeb6 DA |
289 | __putname(v9ses->name); |
290 | __putname(v9ses->remotename); | |
9e82cf6a EVH |
291 | } |
292 | ||
322b329a EVH |
293 | /** |
294 | * v9fs_session_cancel - mark transport as disconnected | |
295 | * and cancel all pending requests. | |
296 | */ | |
297 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { | |
bd238fb4 LI |
298 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
299 | p9_client_disconnect(v9ses->clnt); | |
322b329a EVH |
300 | } |
301 | ||
9e82cf6a EVH |
302 | extern int v9fs_error_init(void); |
303 | ||
304 | /** | |
305 | * v9fs_init - Initialize module | |
306 | * | |
307 | */ | |
308 | ||
309 | static int __init init_v9fs(void) | |
310 | { | |
f94b3470 | 311 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
9e82cf6a | 312 | |
bd238fb4 | 313 | return register_filesystem(&v9fs_fs_type); |
9e82cf6a EVH |
314 | } |
315 | ||
316 | /** | |
317 | * v9fs_init - shutdown module | |
318 | * | |
319 | */ | |
320 | ||
321 | static void __exit exit_v9fs(void) | |
322 | { | |
323 | unregister_filesystem(&v9fs_fs_type); | |
324 | } | |
325 | ||
326 | module_init(init_v9fs) | |
327 | module_exit(exit_v9fs) | |
328 | ||
bd238fb4 | 329 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
9e82cf6a EVH |
330 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
331 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
332 | MODULE_LICENSE("GPL"); |