fix create_new_namespaces() return value
[linux-2.6] / fs / 9p / v9fs.c
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
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 <net/9p/9p.h>
33 #include <net/9p/transport.h>
34 #include <net/9p/conn.h>
35 #include <net/9p/client.h>
36 #include "v9fs.h"
37 #include "v9fs_vfs.h"
38
39 /*
40   * Option Parsing (code inspired by NFS code)
41   *
42   */
43
44 enum {
45         /* Options that take integer arguments */
46         Opt_debug, Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
47         Opt_rfdno, Opt_wfdno,
48         /* String options */
49         Opt_uname, Opt_remotename,
50         /* Options that take no arguments */
51         Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
52         /* Cache options */
53         Opt_cache_loose,
54         /* Error token */
55         Opt_err
56 };
57
58 static match_table_t tokens = {
59         {Opt_debug, "debug=%x"},
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"},
67         {Opt_uname, "uname=%s"},
68         {Opt_remotename, "aname=%s"},
69         {Opt_unix, "proto=unix"},
70         {Opt_tcp, "proto=tcp"},
71         {Opt_fd, "proto=fd"},
72 #ifdef CONFIG_PCI_9P
73         {Opt_pci, "proto=pci"},
74 #endif
75         {Opt_tcp, "tcp"},
76         {Opt_unix, "unix"},
77         {Opt_fd, "fd"},
78         {Opt_legacy, "noextend"},
79         {Opt_nodevmap, "nodevmap"},
80         {Opt_cache_loose, "cache=loose"},
81         {Opt_cache_loose, "loose"},
82         {Opt_err, NULL}
83 };
84
85 extern struct p9_transport *p9pci_trans_create(void);
86
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;
114         v9ses->cache = 0;
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);
124                 if (token < Opt_uname) {
125                         if ((ret = match_int(&args[0], &option)) < 0) {
126                                 P9_DPRINTK(P9_DEBUG_ERROR,
127                                         "integer field, but no integer?\n");
128                                 continue;
129                         }
130                 }
131                 switch (token) {
132                 case Opt_debug:
133                         v9ses->debug = option;
134                         p9_debug_level = option;
135                         break;
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;
157                 case Opt_tcp:
158                         v9ses->proto = PROTO_TCP;
159                         break;
160                 case Opt_unix:
161                         v9ses->proto = PROTO_UNIX;
162                         break;
163                 case Opt_pci:
164                         v9ses->proto = PROTO_PCI;
165                         break;
166                 case Opt_fd:
167                         v9ses->proto = PROTO_FD;
168                         break;
169                 case Opt_uname:
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;
181                 case Opt_cache_loose:
182                         v9ses->cache = CACHE_LOOSE;
183                         break;
184                 default:
185                         continue;
186                 }
187         }
188 }
189
190 /**
191  * v9fs_session_init - initialize session
192  * @v9ses: session information structure
193  * @dev_name: device being mounted
194  * @data: options
195  *
196  */
197
198 struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
199                   const char *dev_name, char *data)
200 {
201         int retval = -EINVAL;
202         struct p9_transport *trans;
203         struct p9_fid *fid;
204
205         v9ses->name = __getname();
206         if (!v9ses->name)
207                 return ERR_PTR(-ENOMEM);
208
209         v9ses->remotename = __getname();
210         if (!v9ses->remotename) {
211                 __putname(v9ses->name);
212                 return ERR_PTR(-ENOMEM);
213         }
214
215         strcpy(v9ses->name, V9FS_DEFUSER);
216         strcpy(v9ses->remotename, V9FS_DEFANAME);
217
218         v9fs_parse_options(data, v9ses);
219
220         switch (v9ses->proto) {
221         case PROTO_TCP:
222                 trans = p9_trans_create_tcp(dev_name, v9ses->port);
223                 break;
224         case PROTO_UNIX:
225                 trans = p9_trans_create_unix(dev_name);
226                 *v9ses->remotename = 0;
227                 break;
228         case PROTO_FD:
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();
235                 *v9ses->remotename = 0;
236                 break;
237 #endif
238         default:
239                 printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
240                 retval = -ENOPROTOOPT;
241                 goto error;
242         };
243
244         if (IS_ERR(trans)) {
245                 retval = PTR_ERR(trans);
246                 trans = NULL;
247                 goto error;
248         }
249
250         v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
251                 v9ses->extended);
252
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;
258         }
259
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;
267         }
268
269         return fid;
270
271 error:
272         v9fs_session_close(v9ses);
273         return ERR_PTR(retval);
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 {
284         if (v9ses->clnt) {
285                 p9_client_destroy(v9ses->clnt);
286                 v9ses->clnt = NULL;
287         }
288
289         __putname(v9ses->name);
290         __putname(v9ses->remotename);
291 }
292
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) {
298         P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
299         p9_client_disconnect(v9ses->clnt);
300 }
301
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 {
311         printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
312
313         return register_filesystem(&v9fs_fs_type);
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
329 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
330 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
331 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
332 MODULE_LICENSE("GPL");