4 * This file contains functions assisting in mapping VFS to 9P2000
6 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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.
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.
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
26 #include <linux/module.h>
27 #include <linux/errno.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/client.h>
39 * Option Parsing (code inspired by NFS code)
40 * NOTE: each transport will parse its own options
44 /* Options that take integer arguments */
45 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
47 Opt_uname, Opt_remotename, Opt_trans,
48 /* Options that take no arguments */
58 static match_table_t tokens = {
59 {Opt_debug, "debug=%x"},
60 {Opt_dfltuid, "dfltuid=%u"},
61 {Opt_dfltgid, "dfltgid=%u"},
62 {Opt_afid, "afid=%u"},
63 {Opt_uname, "uname=%s"},
64 {Opt_remotename, "aname=%s"},
65 {Opt_nodevmap, "nodevmap"},
66 {Opt_cache_loose, "cache=loose"},
67 {Opt_cache_loose, "loose"},
68 {Opt_access, "access=%s"},
73 * v9fs_parse_options - parse mount options into session structure
74 * @v9ses: existing v9fs session information
78 static void v9fs_parse_options(struct v9fs_session_info *v9ses)
81 substring_t args[MAX_OPT_ARGS];
95 options = kstrdup(v9ses->options, GFP_KERNEL);
96 while ((p = strsep(&options, ",")) != NULL) {
100 token = match_token(p, tokens, args);
101 if (token < Opt_uname) {
102 ret = match_int(&args[0], &option);
104 P9_DPRINTK(P9_DEBUG_ERROR,
105 "integer field, but no integer?\n");
111 v9ses->debug = option;
112 #ifdef CONFIG_NET_9P_DEBUG
113 p9_debug_level = option;
118 v9ses->dfltuid = option;
121 v9ses->dfltgid = option;
124 v9ses->afid = option;
127 match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
130 match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
135 case Opt_cache_loose:
136 v9ses->cache = CACHE_LOOSE;
140 s = match_strdup(&args[0]);
141 v9ses->flags &= ~V9FS_ACCESS_MASK;
142 if (strcmp(s, "user") == 0)
143 v9ses->flags |= V9FS_ACCESS_USER;
144 else if (strcmp(s, "any") == 0)
145 v9ses->flags |= V9FS_ACCESS_ANY;
147 v9ses->flags |= V9FS_ACCESS_SINGLE;
148 v9ses->uid = simple_strtol(s, &e, 10);
163 * v9fs_session_init - initialize session
164 * @v9ses: session information structure
165 * @dev_name: device being mounted
170 struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
171 const char *dev_name, char *data)
173 int retval = -EINVAL;
176 v9ses->uname = __getname();
178 return ERR_PTR(-ENOMEM);
180 v9ses->aname = __getname();
182 __putname(v9ses->uname);
183 return ERR_PTR(-ENOMEM);
186 v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
187 strcpy(v9ses->uname, V9FS_DEFUSER);
188 strcpy(v9ses->aname, V9FS_DEFANAME);
190 v9ses->dfltuid = V9FS_DEFUID;
191 v9ses->dfltgid = V9FS_DEFGID;
192 v9ses->options = kstrdup(data, GFP_KERNEL);
193 v9fs_parse_options(v9ses);
195 v9ses->clnt = p9_client_create(dev_name, v9ses->options);
197 if (IS_ERR(v9ses->clnt)) {
198 retval = PTR_ERR(v9ses->clnt);
200 P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
204 if (!v9ses->clnt->dotu)
205 v9ses->flags &= ~V9FS_EXTENDED;
207 v9ses->maxdata = v9ses->clnt->msize;
209 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
210 if (!v9fs_extended(v9ses) &&
211 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
213 v9ses->flags &= ~V9FS_ACCESS_MASK;
214 v9ses->flags |= V9FS_ACCESS_ANY;
218 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
221 retval = PTR_ERR(fid);
223 P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
227 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
228 fid->uid = v9ses->uid;
235 v9fs_session_close(v9ses);
236 return ERR_PTR(retval);
240 * v9fs_session_close - shutdown a session
241 * @v9ses: session information structure
245 void v9fs_session_close(struct v9fs_session_info *v9ses)
248 p9_client_destroy(v9ses->clnt);
252 __putname(v9ses->uname);
253 __putname(v9ses->aname);
254 kfree(v9ses->options);
258 * v9fs_session_cancel - terminate a session
259 * @v9ses: session to terminate
261 * mark transport as disconnected and cancel all pending requests.
264 void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
265 P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
266 p9_client_disconnect(v9ses->clnt);
269 extern int v9fs_error_init(void);
272 * v9fs_init - Initialize module
276 static int __init init_v9fs(void)
278 printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
279 /* TODO: Setup list of registered trasnport modules */
280 return register_filesystem(&v9fs_fs_type);
284 * v9fs_init - shutdown module
288 static void __exit exit_v9fs(void)
290 unregister_filesystem(&v9fs_fs_type);
293 module_init(init_v9fs)
294 module_exit(exit_v9fs)
296 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
297 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
298 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
299 MODULE_LICENSE("GPL");