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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 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06006 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -07007 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050033#include <net/9p/9p.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050034#include <net/9p/client.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050035#include <net/9p/transport.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"
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050038#include "cache.h"
39
40static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
41static LIST_HEAD(v9fs_sessionlist);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070042
43/*
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050044 * Option Parsing (code inspired by NFS code)
45 * NOTE: each transport will parse its own options
46 */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070047
48enum {
49 /* Options that take integer arguments */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060050 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070051 /* String options */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050052 Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070053 /* Options that take no arguments */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060054 Opt_nodevmap,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060055 /* Cache options */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050056 Opt_cache_loose, Opt_fscache,
Latchesar Ionkovba176742007-10-17 14:31:07 -050057 /* Access options */
58 Opt_access,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070059 /* Error token */
60 Opt_err
61};
62
Steven Whitehousea447c092008-10-13 10:46:57 +010063static const match_table_t tokens = {
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -050064 {Opt_debug, "debug=%x"},
Latchesar Ionkovbd32b822007-10-17 14:31:07 -050065 {Opt_dfltuid, "dfltuid=%u"},
66 {Opt_dfltgid, "dfltgid=%u"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070067 {Opt_afid, "afid=%u"},
Eric Van Hensbergen67543e52006-03-25 03:07:29 -080068 {Opt_uname, "uname=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070069 {Opt_remotename, "aname=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070070 {Opt_nodevmap, "nodevmap"},
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050071 {Opt_cache, "cache=%s"},
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060072 {Opt_cache_loose, "loose"},
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050073 {Opt_fscache, "fscache"},
74 {Opt_cachetag, "cachetag=%s"},
Latchesar Ionkovba176742007-10-17 14:31:07 -050075 {Opt_access, "access=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070076 {Opt_err, NULL}
77};
78
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070079/**
80 * v9fs_parse_options - parse mount options into session structure
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070081 * @v9ses: existing v9fs session information
82 *
Jim Meyeringab312672008-03-06 17:10:28 -060083 * Return 0 upon success, -ERRNO upon failure.
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070084 */
85
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -050086static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070087{
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -060088 char *options, *tmp_options;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070089 substring_t args[MAX_OPT_ARGS];
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050090 char *p;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060091 int option = 0;
Latchesar Ionkovba176742007-10-17 14:31:07 -050092 char *s, *e;
Jim Meyeringab312672008-03-06 17:10:28 -060093 int ret = 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070094
95 /* setup defaults */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070096 v9ses->afid = ~0;
97 v9ses->debug = 0;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060098 v9ses->cache = 0;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050099#ifdef CONFIG_9P_FSCACHE
100 v9ses->cachetag = NULL;
101#endif
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700102
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500103 if (!opts)
Jim Meyeringab312672008-03-06 17:10:28 -0600104 return 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700105
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600106 tmp_options = kstrdup(opts, GFP_KERNEL);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600107 if (!tmp_options) {
108 ret = -ENOMEM;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500109 goto fail_option_alloc;
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600110 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600111 options = tmp_options;
Jim Meyeringab312672008-03-06 17:10:28 -0600112
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700113 while ((p = strsep(&options, ",")) != NULL) {
114 int token;
115 if (!*p)
116 continue;
117 token = match_token(p, tokens, args);
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800118 if (token < Opt_uname) {
Jim Meyeringab312672008-03-06 17:10:28 -0600119 int r = match_int(&args[0], &option);
120 if (r < 0) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500121 P9_DPRINTK(P9_DEBUG_ERROR,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700122 "integer field, but no integer?\n");
Jim Meyeringab312672008-03-06 17:10:28 -0600123 ret = r;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700124 continue;
125 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700126 }
127 switch (token) {
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500128 case Opt_debug:
129 v9ses->debug = option;
Eric Van Hensbergen10fa16e2007-07-16 16:02:49 -0500130#ifdef CONFIG_NET_9P_DEBUG
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500131 p9_debug_level = option;
Eric Van Hensbergen10fa16e2007-07-16 16:02:49 -0500132#endif
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500133 break;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600134
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500135 case Opt_dfltuid:
136 v9ses->dfltuid = option;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700137 break;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500138 case Opt_dfltgid:
139 v9ses->dfltgid = option;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700140 break;
141 case Opt_afid:
142 v9ses->afid = option;
143 break;
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800144 case Opt_uname:
Markus Armbrusterb32a09d2008-02-26 09:57:11 -0600145 match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700146 break;
147 case Opt_remotename:
Markus Armbrusterb32a09d2008-02-26 09:57:11 -0600148 match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700149 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700150 case Opt_nodevmap:
151 v9ses->nodev = 1;
152 break;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600153 case Opt_cache_loose:
154 v9ses->cache = CACHE_LOOSE;
155 break;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500156 case Opt_fscache:
157 v9ses->cache = CACHE_FSCACHE;
158 break;
159 case Opt_cachetag:
160#ifdef CONFIG_9P_FSCACHE
161 v9ses->cachetag = match_strdup(&args[0]);
162#endif
163 break;
164 case Opt_cache:
165 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600166 if (!s) {
167 ret = -ENOMEM;
168 P9_DPRINTK(P9_DEBUG_ERROR,
169 "problem allocating copy of cache arg\n");
170 goto free_and_return;
171 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500172
173 if (strcmp(s, "loose") == 0)
174 v9ses->cache = CACHE_LOOSE;
175 else if (strcmp(s, "fscache") == 0)
176 v9ses->cache = CACHE_FSCACHE;
177 else
178 v9ses->cache = CACHE_NONE;
179 kfree(s);
180 break;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500181
182 case Opt_access:
183 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600184 if (!s) {
185 ret = -ENOMEM;
186 P9_DPRINTK(P9_DEBUG_ERROR,
187 "problem allocating copy of access arg\n");
188 goto free_and_return;
189 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500190
Latchesar Ionkovba176742007-10-17 14:31:07 -0500191 v9ses->flags &= ~V9FS_ACCESS_MASK;
192 if (strcmp(s, "user") == 0)
193 v9ses->flags |= V9FS_ACCESS_USER;
194 else if (strcmp(s, "any") == 0)
195 v9ses->flags |= V9FS_ACCESS_ANY;
196 else {
197 v9ses->flags |= V9FS_ACCESS_SINGLE;
Julia Lawallf1d9e452008-12-19 16:50:22 -0600198 v9ses->uid = simple_strtoul(s, &e, 10);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500199 if (*e != '\0')
200 v9ses->uid = ~0;
201 }
Adrian Bunk0a976292007-10-23 13:48:50 -0500202 kfree(s);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500203 break;
204
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700205 default:
206 continue;
207 }
208 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600209
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600210free_and_return:
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600211 kfree(tmp_options);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500212fail_option_alloc:
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600213 return ret;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700214}
215
216/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700217 * v9fs_session_init - initialize session
218 * @v9ses: session information structure
219 * @dev_name: device being mounted
220 * @data: options
221 *
222 */
223
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500224struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700225 const char *dev_name, char *data)
226{
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700227 int retval = -EINVAL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500228 struct p9_fid *fid;
Jim Meyeringab312672008-03-06 17:10:28 -0600229 int rc;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700230
Latchesar Ionkovba176742007-10-17 14:31:07 -0500231 v9ses->uname = __getname();
232 if (!v9ses->uname)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500233 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700234
Latchesar Ionkovba176742007-10-17 14:31:07 -0500235 v9ses->aname = __getname();
236 if (!v9ses->aname) {
237 __putname(v9ses->uname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500238 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700239 }
240
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200241 rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
242 if (rc) {
243 __putname(v9ses->aname);
244 __putname(v9ses->uname);
245 return ERR_PTR(rc);
246 }
247
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500248 spin_lock(&v9fs_sessionlist_lock);
249 list_add(&v9ses->slist, &v9fs_sessionlist);
250 spin_unlock(&v9fs_sessionlist_lock);
251
Sripathi Kodi476ada02010-03-17 17:02:38 +0000252 v9ses->flags = V9FS_ACCESS_USER;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500253 strcpy(v9ses->uname, V9FS_DEFUSER);
254 strcpy(v9ses->aname, V9FS_DEFANAME);
255 v9ses->uid = ~0;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500256 v9ses->dfltuid = V9FS_DEFUID;
257 v9ses->dfltgid = V9FS_DEFGID;
Jim Meyeringab312672008-03-06 17:10:28 -0600258
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500259 rc = v9fs_parse_options(v9ses, data);
Jim Meyeringab312672008-03-06 17:10:28 -0600260 if (rc < 0) {
261 retval = rc;
262 goto error;
263 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700264
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500265 v9ses->clnt = p9_client_create(dev_name, data);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500266 if (IS_ERR(v9ses->clnt)) {
267 retval = PTR_ERR(v9ses->clnt);
268 v9ses->clnt = NULL;
269 P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
270 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700271 }
272
Sripathi Kodi476ada02010-03-17 17:02:38 +0000273 if (p9_is_proto_dotl(v9ses->clnt))
274 v9ses->flags |= V9FS_PROTO_2000L;
275 else if (p9_is_proto_dotu(v9ses->clnt))
276 v9ses->flags |= V9FS_PROTO_2000U;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500277
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500278 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600279
Latchesar Ionkovba176742007-10-17 14:31:07 -0500280 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
Sripathi Kodidd6102f2010-03-05 18:48:00 +0000281 if (!v9fs_proto_dotu(v9ses) &&
Latchesar Ionkovba176742007-10-17 14:31:07 -0500282 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
283
284 v9ses->flags &= ~V9FS_ACCESS_MASK;
285 v9ses->flags |= V9FS_ACCESS_ANY;
286 v9ses->uid = ~0;
287 }
288
289 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
290 v9ses->aname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500291 if (IS_ERR(fid)) {
292 retval = PTR_ERR(fid);
293 fid = NULL;
294 P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
295 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700296 }
297
Latchesar Ionkovba176742007-10-17 14:31:07 -0500298 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
299 fid->uid = v9ses->uid;
300 else
301 fid->uid = ~0;
302
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500303#ifdef CONFIG_9P_FSCACHE
304 /* register the session for caching */
305 v9fs_cache_session_get_cookie(v9ses);
306#endif
307
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500308 return fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700309
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500310error:
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200311 bdi_destroy(&v9ses->bdi);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500312 return ERR_PTR(retval);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700313}
314
315/**
316 * v9fs_session_close - shutdown a session
317 * @v9ses: session information structure
318 *
319 */
320
321void v9fs_session_close(struct v9fs_session_info *v9ses)
322{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500323 if (v9ses->clnt) {
324 p9_client_destroy(v9ses->clnt);
325 v9ses->clnt = NULL;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800326 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700327
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500328#ifdef CONFIG_9P_FSCACHE
329 if (v9ses->fscache) {
330 v9fs_cache_session_put_cookie(v9ses);
331 kfree(v9ses->cachetag);
332 }
333#endif
Latchesar Ionkovba176742007-10-17 14:31:07 -0500334 __putname(v9ses->uname);
335 __putname(v9ses->aname);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500336
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200337 bdi_destroy(&v9ses->bdi);
338
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500339 spin_lock(&v9fs_sessionlist_lock);
340 list_del(&v9ses->slist);
341 spin_unlock(&v9fs_sessionlist_lock);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700342}
343
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700344/**
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600345 * v9fs_session_cancel - terminate a session
346 * @v9ses: session to terminate
347 *
348 * mark transport as disconnected and cancel all pending requests.
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700349 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600350
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700351void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500352 P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
353 p9_client_disconnect(v9ses->clnt);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700354}
355
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500356/**
357 * v9fs_session_begin_cancel - Begin terminate of a session
358 * @v9ses: session to terminate
359 *
360 * After this call we don't allow any request other than clunk.
361 */
362
363void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
364{
365 P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
366 p9_client_begin_disconnect(v9ses->clnt);
367}
368
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700369extern int v9fs_error_init(void);
370
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500371static struct kobject *v9fs_kobj;
372
373#ifdef CONFIG_9P_FSCACHE
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700374/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500375 * caches_show - list caches associated with a session
376 *
377 * Returns the size of buffer written.
378 */
379
380static ssize_t caches_show(struct kobject *kobj,
381 struct kobj_attribute *attr,
382 char *buf)
383{
384 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
385 struct v9fs_session_info *v9ses;
386
387 spin_lock(&v9fs_sessionlist_lock);
388 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
389 if (v9ses->cachetag) {
390 n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
391 if (n < 0) {
392 count = n;
393 break;
394 }
395
396 count += n;
397 limit -= n;
398 }
399 }
400
401 spin_unlock(&v9fs_sessionlist_lock);
402 return count;
403}
404
405static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
406#endif /* CONFIG_9P_FSCACHE */
407
408static struct attribute *v9fs_attrs[] = {
409#ifdef CONFIG_9P_FSCACHE
410 &v9fs_attr_cache.attr,
411#endif
412 NULL,
413};
414
415static struct attribute_group v9fs_attr_group = {
416 .attrs = v9fs_attrs,
417};
418
419/**
420 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
421 *
422 */
423
424static int v9fs_sysfs_init(void)
425{
426 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
427 if (!v9fs_kobj)
428 return -ENOMEM;
429
430 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
431 kobject_put(v9fs_kobj);
432 return -ENOMEM;
433 }
434
435 return 0;
436}
437
438/**
439 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
440 *
441 */
442
443static void v9fs_sysfs_cleanup(void)
444{
445 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
446 kobject_put(v9fs_kobj);
447}
448
449/**
450 * init_v9fs - Initialize module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700451 *
452 */
453
454static int __init init_v9fs(void)
455{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500456 int err;
Eric Van Hensbergenf94b3472007-01-26 00:57:04 -0800457 printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500458 /* TODO: Setup list of registered trasnport modules */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500459 err = register_filesystem(&v9fs_fs_type);
460 if (err < 0) {
461 printk(KERN_ERR "Failed to register filesystem\n");
462 return err;
463 }
464
465 err = v9fs_cache_register();
466 if (err < 0) {
467 printk(KERN_ERR "Failed to register v9fs for caching\n");
468 goto out_fs_unreg;
469 }
470
471 err = v9fs_sysfs_init();
472 if (err < 0) {
473 printk(KERN_ERR "Failed to register with sysfs\n");
474 goto out_sysfs_cleanup;
475 }
476
477 return 0;
478
479out_sysfs_cleanup:
480 v9fs_sysfs_cleanup();
481
482out_fs_unreg:
483 unregister_filesystem(&v9fs_fs_type);
484
485 return err;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700486}
487
488/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500489 * exit_v9fs - shutdown module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700490 *
491 */
492
493static void __exit exit_v9fs(void)
494{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500495 v9fs_sysfs_cleanup();
496 v9fs_cache_unregister();
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700497 unregister_filesystem(&v9fs_fs_type);
498}
499
500module_init(init_v9fs)
501module_exit(exit_v9fs)
502
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500503MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700504MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
505MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
506MODULE_LICENSE("GPL");