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Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -07001/*
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
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080010 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070012 *
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
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070026#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
Al Viro914e2632006-10-18 13:55:46 -040029#include <linux/sched.h>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070030#include <linux/parser.h>
31#include <linux/idr.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050032#include <net/9p/9p.h>
33#include <net/9p/transport.h>
34#include <net/9p/conn.h>
35#include <net/9p/client.h>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070036#include "v9fs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070037#include "v9fs_vfs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070038
39/*
40 * Option Parsing (code inspired by NFS code)
41 *
42 */
43
44enum {
45 /* Options that take integer arguments */
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050046 Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070047 Opt_rfdno, Opt_wfdno,
48 /* String options */
Eric Van Hensbergen67543e52006-03-25 03:07:29 -080049 Opt_uname, Opt_remotename,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070050 /* Options that take no arguments */
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050051 Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060052 /* Cache options */
53 Opt_cache_loose,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070054 /* Error token */
55 Opt_err
56};
57
58static match_table_t tokens = {
59 {Opt_port, "port=%u"},
60 {Opt_msize, "msize=%u"},
61 {Opt_uid, "uid=%u"},
62 {Opt_gid, "gid=%u"},
63 {Opt_afid, "afid=%u"},
64 {Opt_rfdno, "rfdno=%u"},
65 {Opt_wfdno, "wfdno=%u"},
Eric Van Hensbergen67543e52006-03-25 03:07:29 -080066 {Opt_uname, "uname=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070067 {Opt_remotename, "aname=%s"},
68 {Opt_unix, "proto=unix"},
69 {Opt_tcp, "proto=tcp"},
70 {Opt_fd, "proto=fd"},
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050071#ifdef CONFIG_PCI_9P
72 {Opt_pci, "proto=pci"},
73#endif
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070074 {Opt_tcp, "tcp"},
75 {Opt_unix, "unix"},
76 {Opt_fd, "fd"},
77 {Opt_legacy, "noextend"},
78 {Opt_nodevmap, "nodevmap"},
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060079 {Opt_cache_loose, "cache=loose"},
80 {Opt_cache_loose, "loose"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070081 {Opt_err, NULL}
82};
83
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050084extern struct p9_transport *p9pci_trans_create(void);
85
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070086/*
87 * Parse option string.
88 */
89
90/**
91 * v9fs_parse_options - parse mount options into session structure
92 * @options: options string passed from mount
93 * @v9ses: existing v9fs session information
94 *
95 */
96
97static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
98{
99 char *p;
100 substring_t args[MAX_OPT_ARGS];
101 int option;
102 int ret;
103
104 /* setup defaults */
105 v9ses->port = V9FS_PORT;
106 v9ses->maxdata = 9000;
107 v9ses->proto = PROTO_TCP;
108 v9ses->extended = 1;
109 v9ses->afid = ~0;
110 v9ses->debug = 0;
111 v9ses->rfdno = ~0;
112 v9ses->wfdno = ~0;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600113 v9ses->cache = 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700114
115 if (!options)
116 return;
117
118 while ((p = strsep(&options, ",")) != NULL) {
119 int token;
120 if (!*p)
121 continue;
122 token = match_token(p, tokens, args);
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800123 if (token < Opt_uname) {
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700124 if ((ret = match_int(&args[0], &option)) < 0) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500125 P9_DPRINTK(P9_DEBUG_ERROR,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700126 "integer field, but no integer?\n");
127 continue;
128 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700129 }
130 switch (token) {
131 case Opt_port:
132 v9ses->port = option;
133 break;
134 case Opt_msize:
135 v9ses->maxdata = option;
136 break;
137 case Opt_uid:
138 v9ses->uid = option;
139 break;
140 case Opt_gid:
141 v9ses->gid = option;
142 break;
143 case Opt_afid:
144 v9ses->afid = option;
145 break;
146 case Opt_rfdno:
147 v9ses->rfdno = option;
148 break;
149 case Opt_wfdno:
150 v9ses->wfdno = option;
151 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700152 case Opt_tcp:
153 v9ses->proto = PROTO_TCP;
154 break;
155 case Opt_unix:
156 v9ses->proto = PROTO_UNIX;
157 break;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500158 case Opt_pci:
159 v9ses->proto = PROTO_PCI;
160 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700161 case Opt_fd:
162 v9ses->proto = PROTO_FD;
163 break;
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800164 case Opt_uname:
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700165 match_strcpy(v9ses->name, &args[0]);
166 break;
167 case Opt_remotename:
168 match_strcpy(v9ses->remotename, &args[0]);
169 break;
170 case Opt_legacy:
171 v9ses->extended = 0;
172 break;
173 case Opt_nodevmap:
174 v9ses->nodev = 1;
175 break;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600176 case Opt_cache_loose:
177 v9ses->cache = CACHE_LOOSE;
178 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700179 default:
180 continue;
181 }
182 }
183}
184
185/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700186 * v9fs_session_init - initialize session
187 * @v9ses: session information structure
188 * @dev_name: device being mounted
189 * @data: options
190 *
191 */
192
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500193struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700194 const char *dev_name, char *data)
195{
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700196 int retval = -EINVAL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500197 struct p9_transport *trans;
198 struct p9_fid *fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700199
200 v9ses->name = __getname();
201 if (!v9ses->name)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500202 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700203
204 v9ses->remotename = __getname();
205 if (!v9ses->remotename) {
Davi Arnautce44eeb2005-11-07 00:59:36 -0800206 __putname(v9ses->name);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500207 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700208 }
209
210 strcpy(v9ses->name, V9FS_DEFUSER);
211 strcpy(v9ses->remotename, V9FS_DEFANAME);
212
213 v9fs_parse_options(data, v9ses);
214
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700215 switch (v9ses->proto) {
216 case PROTO_TCP:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500217 trans = p9_trans_create_tcp(dev_name, v9ses->port);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700218 break;
219 case PROTO_UNIX:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500220 trans = p9_trans_create_unix(dev_name);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700221 *v9ses->remotename = 0;
222 break;
223 case PROTO_FD:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500224 trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700225 *v9ses->remotename = 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700226 break;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500227#ifdef CONFIG_PCI_9P
228 case PROTO_PCI:
229 trans = p9pci_trans_create();
230 *v9ses->remotename = 0;
231 break;
232#endif
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700233 default:
234 printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
235 retval = -ENOPROTOOPT;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500236 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700237 };
238
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500239 if (IS_ERR(trans)) {
240 retval = PTR_ERR(trans);
241 trans = NULL;
242 goto error;
Latchesar Ionkova8e63bf2005-09-22 21:43:51 -0700243 }
244
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500245 v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
246 v9ses->extended);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700247
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500248 if (IS_ERR(v9ses->clnt)) {
249 retval = PTR_ERR(v9ses->clnt);
250 v9ses->clnt = NULL;
251 P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
252 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700253 }
254
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500255 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name,
256 v9ses->remotename);
257 if (IS_ERR(fid)) {
258 retval = PTR_ERR(fid);
259 fid = NULL;
260 P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
261 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700262 }
263
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500264 return fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700265
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500266error:
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700267 v9fs_session_close(v9ses);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500268 return ERR_PTR(retval);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700269}
270
271/**
272 * v9fs_session_close - shutdown a session
273 * @v9ses: session information structure
274 *
275 */
276
277void v9fs_session_close(struct v9fs_session_info *v9ses)
278{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500279 if (v9ses->clnt) {
280 p9_client_destroy(v9ses->clnt);
281 v9ses->clnt = NULL;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800282 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700283
Davi Arnautce44eeb2005-11-07 00:59:36 -0800284 __putname(v9ses->name);
285 __putname(v9ses->remotename);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700286}
287
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700288/**
289 * v9fs_session_cancel - mark transport as disconnected
290 * and cancel all pending requests.
291 */
292void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500293 P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
294 p9_client_disconnect(v9ses->clnt);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700295}
296
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700297extern int v9fs_error_init(void);
298
299/**
300 * v9fs_init - Initialize module
301 *
302 */
303
304static int __init init_v9fs(void)
305{
Eric Van Hensbergenf94b3472007-01-26 00:57:04 -0800306 printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700307
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500308 return register_filesystem(&v9fs_fs_type);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700309}
310
311/**
312 * v9fs_init - shutdown module
313 *
314 */
315
316static void __exit exit_v9fs(void)
317{
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700318 unregister_filesystem(&v9fs_fs_type);
319}
320
321module_init(init_v9fs)
322module_exit(exit_v9fs)
323
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500324MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700325MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
326MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
327MODULE_LICENSE("GPL");