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9p: add remove function to trans_virtio
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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
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10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
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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
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26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
914e2637 29#include <linux/sched.h>
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30#include <linux/parser.h>
31#include <linux/idr.h>
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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"
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38
39/*
40 * Option Parsing (code inspired by NFS code)
a80d923e 41 * NOTE: each transport will parse its own options
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42 */
43
44enum {
45 /* Options that take integer arguments */
bd32b82d 46 Opt_debug, Opt_msize, Opt_dfltuid, Opt_dfltgid, Opt_afid,
9e82cf6a 47 /* String options */
a80d923e 48 Opt_uname, Opt_remotename, Opt_trans,
9e82cf6a 49 /* Options that take no arguments */
a80d923e 50 Opt_legacy, Opt_nodevmap,
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51 /* Cache options */
52 Opt_cache_loose,
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53 /* Access options */
54 Opt_access,
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55 /* Error token */
56 Opt_err
57};
58
59static match_table_t tokens = {
9e2f6688 60 {Opt_debug, "debug=%x"},
9e82cf6a 61 {Opt_msize, "msize=%u"},
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62 {Opt_dfltuid, "dfltuid=%u"},
63 {Opt_dfltgid, "dfltgid=%u"},
9e82cf6a 64 {Opt_afid, "afid=%u"},
67543e50 65 {Opt_uname, "uname=%s"},
9e82cf6a 66 {Opt_remotename, "aname=%s"},
a80d923e 67 {Opt_trans, "trans=%s"},
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68 {Opt_legacy, "noextend"},
69 {Opt_nodevmap, "nodevmap"},
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70 {Opt_cache_loose, "cache=loose"},
71 {Opt_cache_loose, "loose"},
ba17674f 72 {Opt_access, "access=%s"},
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73 {Opt_err, NULL}
74};
75
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76/**
77 * v9fs_parse_options - parse mount options into session structure
78 * @options: options string passed from mount
79 * @v9ses: existing v9fs session information
80 *
81 */
82
a80d923e 83static void v9fs_parse_options(struct v9fs_session_info *v9ses)
9e82cf6a 84{
8999e04f 85 char *options;
9e82cf6a 86 substring_t args[MAX_OPT_ARGS];
a80d923e 87 char *p;
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88 int option;
89 int ret;
ba17674f 90 char *s, *e;
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91
92 /* setup defaults */
a80d923e 93 v9ses->maxdata = 8192;
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94 v9ses->afid = ~0;
95 v9ses->debug = 0;
e03abc0c 96 v9ses->cache = 0;
fb0466c3 97 v9ses->trans = v9fs_default_trans();
9e82cf6a 98
8999e04f 99 if (!v9ses->options)
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100 return;
101
8999e04f 102 options = kstrdup(v9ses->options, GFP_KERNEL);
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103 while ((p = strsep(&options, ",")) != NULL) {
104 int token;
105 if (!*p)
106 continue;
107 token = match_token(p, tokens, args);
67543e50 108 if (token < Opt_uname) {
9e82cf6a 109 if ((ret = match_int(&args[0], &option)) < 0) {
bd238fb4 110 P9_DPRINTK(P9_DEBUG_ERROR,
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111 "integer field, but no integer?\n");
112 continue;
113 }
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114 }
115 switch (token) {
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116 case Opt_debug:
117 v9ses->debug = option;
10fa16e7 118#ifdef CONFIG_NET_9P_DEBUG
9e2f6688 119 p9_debug_level = option;
10fa16e7 120#endif
9e2f6688 121 break;
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122 case Opt_msize:
123 v9ses->maxdata = option;
124 break;
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125 case Opt_dfltuid:
126 v9ses->dfltuid = option;
9e82cf6a 127 break;
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128 case Opt_dfltgid:
129 v9ses->dfltgid = option;
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130 break;
131 case Opt_afid:
132 v9ses->afid = option;
133 break;
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134 case Opt_trans:
135 v9ses->trans = v9fs_match_trans(&args[0]);
9e82cf6a 136 break;
67543e50 137 case Opt_uname:
ba17674f 138 match_strcpy(v9ses->uname, &args[0]);
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139 break;
140 case Opt_remotename:
ba17674f 141 match_strcpy(v9ses->aname, &args[0]);
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142 break;
143 case Opt_legacy:
2405669b 144 v9ses->flags &= ~V9FS_EXTENDED;
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145 break;
146 case Opt_nodevmap:
147 v9ses->nodev = 1;
148 break;
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149 case Opt_cache_loose:
150 v9ses->cache = CACHE_LOOSE;
151 break;
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152
153 case Opt_access:
154 s = match_strdup(&args[0]);
155 v9ses->flags &= ~V9FS_ACCESS_MASK;
156 if (strcmp(s, "user") == 0)
157 v9ses->flags |= V9FS_ACCESS_USER;
158 else if (strcmp(s, "any") == 0)
159 v9ses->flags |= V9FS_ACCESS_ANY;
160 else {
161 v9ses->flags |= V9FS_ACCESS_SINGLE;
162 v9ses->uid = simple_strtol(s, &e, 10);
163 if (*e != '\0')
164 v9ses->uid = ~0;
165 }
0a976297 166 kfree(s);
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167 break;
168
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169 default:
170 continue;
171 }
172 }
8999e04f 173 kfree(options);
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174}
175
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176/**
177 * v9fs_session_init - initialize session
178 * @v9ses: session information structure
179 * @dev_name: device being mounted
180 * @data: options
181 *
182 */
183
bd238fb4 184struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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185 const char *dev_name, char *data)
186{
9e82cf6a 187 int retval = -EINVAL;
a80d923e 188 struct p9_trans *trans = NULL;
bd238fb4 189 struct p9_fid *fid;
9e82cf6a 190
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191 v9ses->uname = __getname();
192 if (!v9ses->uname)
bd238fb4 193 return ERR_PTR(-ENOMEM);
9e82cf6a 194
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195 v9ses->aname = __getname();
196 if (!v9ses->aname) {
197 __putname(v9ses->uname);
bd238fb4 198 return ERR_PTR(-ENOMEM);
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199 }
200
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201 v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
202 strcpy(v9ses->uname, V9FS_DEFUSER);
203 strcpy(v9ses->aname, V9FS_DEFANAME);
204 v9ses->uid = ~0;
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205 v9ses->dfltuid = V9FS_DEFUID;
206 v9ses->dfltgid = V9FS_DEFGID;
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207 v9ses->options = kstrdup(data, GFP_KERNEL);
208 v9fs_parse_options(v9ses);
209
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210 if (v9ses->trans == NULL) {
211 retval = -EPROTONOSUPPORT;
212 P9_DPRINTK(P9_DEBUG_ERROR,
213 "No transport defined or default transport\n");
bd238fb4 214 goto error;
a80d923e 215 }
9e82cf6a 216
a80d923e 217 trans = v9ses->trans->create(dev_name, v9ses->options);
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218 if (IS_ERR(trans)) {
219 retval = PTR_ERR(trans);
220 trans = NULL;
221 goto error;
a8e63bff 222 }
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223 if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize)
224 v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ;
a8e63bff 225
a80d923e 226 v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ,
2405669b 227 v9fs_extended(v9ses));
9e82cf6a 228
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229 if (IS_ERR(v9ses->clnt)) {
230 retval = PTR_ERR(v9ses->clnt);
231 v9ses->clnt = NULL;
232 P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
233 goto error;
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234 }
235
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236 if (!v9ses->clnt->dotu)
237 v9ses->flags &= ~V9FS_EXTENDED;
238
239 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
240 if (!v9fs_extended(v9ses) &&
241 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
242
243 v9ses->flags &= ~V9FS_ACCESS_MASK;
244 v9ses->flags |= V9FS_ACCESS_ANY;
245 v9ses->uid = ~0;
246 }
247
248 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
249 v9ses->aname);
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250 if (IS_ERR(fid)) {
251 retval = PTR_ERR(fid);
252 fid = NULL;
253 P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
254 goto error;
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255 }
256
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257 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
258 fid->uid = v9ses->uid;
259 else
260 fid->uid = ~0;
261
bd238fb4 262 return fid;
9e82cf6a 263
bd238fb4 264error:
9e82cf6a 265 v9fs_session_close(v9ses);
bd238fb4 266 return ERR_PTR(retval);
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267}
268
269/**
270 * v9fs_session_close - shutdown a session
271 * @v9ses: session information structure
272 *
273 */
274
275void v9fs_session_close(struct v9fs_session_info *v9ses)
276{
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277 if (v9ses->clnt) {
278 p9_client_destroy(v9ses->clnt);
279 v9ses->clnt = NULL;
3cf6429a 280 }
9e82cf6a 281
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282 __putname(v9ses->uname);
283 __putname(v9ses->aname);
a80d923e 284 kfree(v9ses->options);
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285}
286
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287/**
288 * v9fs_session_cancel - mark transport as disconnected
289 * and cancel all pending requests.
290 */
291void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
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292 P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
293 p9_client_disconnect(v9ses->clnt);
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294}
295
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296extern int v9fs_error_init(void);
297
298/**
299 * v9fs_init - Initialize module
300 *
301 */
302
303static int __init init_v9fs(void)
304{
f94b3470 305 printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
a80d923e 306 /* TODO: Setup list of registered trasnport modules */
bd238fb4 307 return register_filesystem(&v9fs_fs_type);
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308}
309
310/**
311 * v9fs_init - shutdown module
312 *
313 */
314
315static void __exit exit_v9fs(void)
316{
317 unregister_filesystem(&v9fs_fs_type);
318}
319
320module_init(init_v9fs)
321module_exit(exit_v9fs)
322
bd238fb4 323MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
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324MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
325MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
326MODULE_LICENSE("GPL");