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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/9p/v9fs.c
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/client.h>
34 #include <net/9p/transport.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 const 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
76 * Return 0 upon success, -ERRNO upon failure.
79 static int v9fs_parse_options(struct v9fs_session_info
*v9ses
)
82 substring_t args
[MAX_OPT_ARGS
];
96 options
= kstrdup(v9ses
->options
, GFP_KERNEL
);
98 P9_DPRINTK(P9_DEBUG_ERROR
,
99 "failed to allocate copy of option string\n");
103 while ((p
= strsep(&options
, ",")) != NULL
) {
107 token
= match_token(p
, tokens
, args
);
108 if (token
< Opt_uname
) {
109 int r
= match_int(&args
[0], &option
);
111 P9_DPRINTK(P9_DEBUG_ERROR
,
112 "integer field, but no integer?\n");
119 v9ses
->debug
= option
;
120 #ifdef CONFIG_NET_9P_DEBUG
121 p9_debug_level
= option
;
126 v9ses
->dfltuid
= option
;
129 v9ses
->dfltgid
= option
;
132 v9ses
->afid
= option
;
135 match_strlcpy(v9ses
->uname
, &args
[0], PATH_MAX
);
138 match_strlcpy(v9ses
->aname
, &args
[0], PATH_MAX
);
143 case Opt_cache_loose
:
144 v9ses
->cache
= CACHE_LOOSE
;
148 s
= match_strdup(&args
[0]);
150 P9_DPRINTK(P9_DEBUG_ERROR
,
151 "failed to allocate copy"
152 " of option argument\n");
156 v9ses
->flags
&= ~V9FS_ACCESS_MASK
;
157 if (strcmp(s
, "user") == 0)
158 v9ses
->flags
|= V9FS_ACCESS_USER
;
159 else if (strcmp(s
, "any") == 0)
160 v9ses
->flags
|= V9FS_ACCESS_ANY
;
162 v9ses
->flags
|= V9FS_ACCESS_SINGLE
;
163 v9ses
->uid
= simple_strtol(s
, &e
, 10);
179 * v9fs_session_init - initialize session
180 * @v9ses: session information structure
181 * @dev_name: device being mounted
186 struct p9_fid
*v9fs_session_init(struct v9fs_session_info
*v9ses
,
187 const char *dev_name
, char *data
)
189 int retval
= -EINVAL
;
193 v9ses
->uname
= __getname();
195 return ERR_PTR(-ENOMEM
);
197 v9ses
->aname
= __getname();
199 __putname(v9ses
->uname
);
200 return ERR_PTR(-ENOMEM
);
203 v9ses
->flags
= V9FS_EXTENDED
| V9FS_ACCESS_USER
;
204 strcpy(v9ses
->uname
, V9FS_DEFUSER
);
205 strcpy(v9ses
->aname
, V9FS_DEFANAME
);
207 v9ses
->dfltuid
= V9FS_DEFUID
;
208 v9ses
->dfltgid
= V9FS_DEFGID
;
210 v9ses
->options
= kstrdup(data
, GFP_KERNEL
);
211 if (!v9ses
->options
) {
212 P9_DPRINTK(P9_DEBUG_ERROR
,
213 "failed to allocate copy of option string\n");
219 rc
= v9fs_parse_options(v9ses
);
225 v9ses
->clnt
= p9_client_create(dev_name
, v9ses
->options
);
227 if (IS_ERR(v9ses
->clnt
)) {
228 retval
= PTR_ERR(v9ses
->clnt
);
230 P9_DPRINTK(P9_DEBUG_ERROR
, "problem initializing 9p client\n");
234 if (!v9ses
->clnt
->dotu
)
235 v9ses
->flags
&= ~V9FS_EXTENDED
;
237 v9ses
->maxdata
= v9ses
->clnt
->msize
- P9_IOHDRSZ
;
239 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
240 if (!v9fs_extended(v9ses
) &&
241 ((v9ses
->flags
&V9FS_ACCESS_MASK
) == V9FS_ACCESS_USER
)) {
243 v9ses
->flags
&= ~V9FS_ACCESS_MASK
;
244 v9ses
->flags
|= V9FS_ACCESS_ANY
;
248 fid
= p9_client_attach(v9ses
->clnt
, NULL
, v9ses
->uname
, ~0,
251 retval
= PTR_ERR(fid
);
253 P9_DPRINTK(P9_DEBUG_ERROR
, "cannot attach\n");
257 if ((v9ses
->flags
& V9FS_ACCESS_MASK
) == V9FS_ACCESS_SINGLE
)
258 fid
->uid
= v9ses
->uid
;
265 return ERR_PTR(retval
);
269 * v9fs_session_close - shutdown a session
270 * @v9ses: session information structure
274 void v9fs_session_close(struct v9fs_session_info
*v9ses
)
277 p9_client_destroy(v9ses
->clnt
);
281 __putname(v9ses
->uname
);
282 __putname(v9ses
->aname
);
283 kfree(v9ses
->options
);
287 * v9fs_session_cancel - terminate a session
288 * @v9ses: session to terminate
290 * mark transport as disconnected and cancel all pending requests.
293 void v9fs_session_cancel(struct v9fs_session_info
*v9ses
) {
294 P9_DPRINTK(P9_DEBUG_ERROR
, "cancel session %p\n", v9ses
);
295 p9_client_disconnect(v9ses
->clnt
);
298 extern int v9fs_error_init(void);
301 * v9fs_init - Initialize module
305 static int __init
init_v9fs(void)
307 printk(KERN_INFO
"Installing v9fs 9p2000 file system support\n");
308 /* TODO: Setup list of registered trasnport modules */
309 return register_filesystem(&v9fs_fs_type
);
313 * v9fs_init - shutdown module
317 static void __exit
exit_v9fs(void)
319 unregister_filesystem(&v9fs_fs_type
);
322 module_init(init_v9fs
)
323 module_exit(exit_v9fs
)
325 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
326 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
327 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
328 MODULE_LICENSE("GPL");