blob: d934f04e77368e00dc76d4a54720cff0758d3a58 [file] [log] [blame]
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
Joe Perches5d385152011-11-28 10:40:46 -080026#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070028#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
Al Viro914e2632006-10-18 13:55:46 -040031#include <linux/sched.h>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070032#include <linux/parser.h>
33#include <linux/idr.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050035#include <net/9p/9p.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050036#include <net/9p/client.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050037#include <net/9p/transport.h>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070038#include "v9fs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070039#include "v9fs_vfs.h"
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050040#include "cache.h"
41
42static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
43static LIST_HEAD(v9fs_sessionlist);
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +053044struct kmem_cache *v9fs_inode_cache;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070045
46/*
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050047 * Option Parsing (code inspired by NFS code)
48 * NOTE: each transport will parse its own options
49 */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070050
51enum {
52 /* Options that take integer arguments */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060053 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070054 /* String options */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050055 Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070056 /* Options that take no arguments */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060057 Opt_nodevmap,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060058 /* Cache options */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050059 Opt_cache_loose, Opt_fscache,
Latchesar Ionkovba176742007-10-17 14:31:07 -050060 /* Access options */
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -080061 Opt_access, Opt_posixacl,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070062 /* Error token */
63 Opt_err
64};
65
Steven Whitehousea447c092008-10-13 10:46:57 +010066static const match_table_t tokens = {
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -050067 {Opt_debug, "debug=%x"},
Latchesar Ionkovbd32b822007-10-17 14:31:07 -050068 {Opt_dfltuid, "dfltuid=%u"},
69 {Opt_dfltgid, "dfltgid=%u"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070070 {Opt_afid, "afid=%u"},
Eric Van Hensbergen67543e52006-03-25 03:07:29 -080071 {Opt_uname, "uname=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070072 {Opt_remotename, "aname=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070073 {Opt_nodevmap, "nodevmap"},
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050074 {Opt_cache, "cache=%s"},
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060075 {Opt_cache_loose, "loose"},
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050076 {Opt_fscache, "fscache"},
77 {Opt_cachetag, "cachetag=%s"},
Latchesar Ionkovba176742007-10-17 14:31:07 -050078 {Opt_access, "access=%s"},
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -080079 {Opt_posixacl, "posixacl"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070080 {Opt_err, NULL}
81};
82
Prem Karata2dd43b2011-05-06 18:24:18 +053083/* Interpret mount options for cache mode */
84static int get_cache_mode(char *s)
85{
86 int version = -EINVAL;
87
88 if (!strcmp(s, "loose")) {
89 version = CACHE_LOOSE;
Joe Perches5d385152011-11-28 10:40:46 -080090 p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
Prem Karata2dd43b2011-05-06 18:24:18 +053091 } else if (!strcmp(s, "fscache")) {
92 version = CACHE_FSCACHE;
Joe Perches5d385152011-11-28 10:40:46 -080093 p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
Prem Karata2dd43b2011-05-06 18:24:18 +053094 } else if (!strcmp(s, "none")) {
95 version = CACHE_NONE;
Joe Perches5d385152011-11-28 10:40:46 -080096 p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
Prem Karata2dd43b2011-05-06 18:24:18 +053097 } else
Joe Perches5d385152011-11-28 10:40:46 -080098 pr_info("Unknown Cache mode %s\n", s);
Prem Karata2dd43b2011-05-06 18:24:18 +053099 return version;
100}
101
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700102/**
103 * v9fs_parse_options - parse mount options into session structure
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700104 * @v9ses: existing v9fs session information
105 *
Jim Meyeringab312672008-03-06 17:10:28 -0600106 * Return 0 upon success, -ERRNO upon failure.
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700107 */
108
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500109static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700110{
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600111 char *options, *tmp_options;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700112 substring_t args[MAX_OPT_ARGS];
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500113 char *p;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600114 int option = 0;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500115 char *s, *e;
Jim Meyeringab312672008-03-06 17:10:28 -0600116 int ret = 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700117
118 /* setup defaults */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700119 v9ses->afid = ~0;
120 v9ses->debug = 0;
Prem Karata2dd43b2011-05-06 18:24:18 +0530121 v9ses->cache = CACHE_NONE;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500122#ifdef CONFIG_9P_FSCACHE
123 v9ses->cachetag = NULL;
124#endif
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700125
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500126 if (!opts)
Jim Meyeringab312672008-03-06 17:10:28 -0600127 return 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700128
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600129 tmp_options = kstrdup(opts, GFP_KERNEL);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600130 if (!tmp_options) {
131 ret = -ENOMEM;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500132 goto fail_option_alloc;
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600133 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600134 options = tmp_options;
Jim Meyeringab312672008-03-06 17:10:28 -0600135
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700136 while ((p = strsep(&options, ",")) != NULL) {
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530137 int token, r;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700138 if (!*p)
139 continue;
140 token = match_token(p, tokens, args);
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530141 switch (token) {
142 case Opt_debug:
143 r = match_int(&args[0], &option);
Jim Meyeringab312672008-03-06 17:10:28 -0600144 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800145 p9_debug(P9_DEBUG_ERROR,
146 "integer field, but no integer?\n");
Jim Meyeringab312672008-03-06 17:10:28 -0600147 ret = r;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700148 continue;
149 }
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500150 v9ses->debug = option;
Eric Van Hensbergen10fa16e2007-07-16 16:02:49 -0500151#ifdef CONFIG_NET_9P_DEBUG
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500152 p9_debug_level = option;
Eric Van Hensbergen10fa16e2007-07-16 16:02:49 -0500153#endif
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500154 break;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600155
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500156 case Opt_dfltuid:
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530157 r = match_int(&args[0], &option);
158 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800159 p9_debug(P9_DEBUG_ERROR,
160 "integer field, but no integer?\n");
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530161 ret = r;
162 continue;
163 }
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500164 v9ses->dfltuid = option;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700165 break;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500166 case Opt_dfltgid:
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530167 r = match_int(&args[0], &option);
168 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800169 p9_debug(P9_DEBUG_ERROR,
170 "integer field, but no integer?\n");
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530171 ret = r;
172 continue;
173 }
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500174 v9ses->dfltgid = option;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700175 break;
176 case Opt_afid:
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530177 r = match_int(&args[0], &option);
178 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800179 p9_debug(P9_DEBUG_ERROR,
180 "integer field, but no integer?\n");
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530181 ret = r;
182 continue;
183 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700184 v9ses->afid = option;
185 break;
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800186 case Opt_uname:
Jeff Laytone549c132012-09-07 07:55:25 -0400187 kfree(v9ses->uname);
188 v9ses->uname = match_strdup(&args[0]);
189 if (!v9ses->uname) {
190 ret = -ENOMEM;
191 goto free_and_return;
192 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700193 break;
194 case Opt_remotename:
Jeff Laytone549c132012-09-07 07:55:25 -0400195 kfree(v9ses->aname);
196 v9ses->aname = match_strdup(&args[0]);
197 if (!v9ses->aname) {
198 ret = -ENOMEM;
199 goto free_and_return;
200 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700201 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700202 case Opt_nodevmap:
203 v9ses->nodev = 1;
204 break;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600205 case Opt_cache_loose:
206 v9ses->cache = CACHE_LOOSE;
207 break;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500208 case Opt_fscache:
209 v9ses->cache = CACHE_FSCACHE;
210 break;
211 case Opt_cachetag:
212#ifdef CONFIG_9P_FSCACHE
213 v9ses->cachetag = match_strdup(&args[0]);
214#endif
215 break;
216 case Opt_cache:
217 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600218 if (!s) {
219 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800220 p9_debug(P9_DEBUG_ERROR,
221 "problem allocating copy of cache arg\n");
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600222 goto free_and_return;
223 }
Prem Karata2dd43b2011-05-06 18:24:18 +0530224 ret = get_cache_mode(s);
225 if (ret == -EINVAL) {
226 kfree(s);
227 goto free_and_return;
228 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500229
Prem Karata2dd43b2011-05-06 18:24:18 +0530230 v9ses->cache = ret;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500231 kfree(s);
232 break;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500233
234 case Opt_access:
235 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600236 if (!s) {
237 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800238 p9_debug(P9_DEBUG_ERROR,
239 "problem allocating copy of access arg\n");
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600240 goto free_and_return;
241 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500242
Latchesar Ionkovba176742007-10-17 14:31:07 -0500243 v9ses->flags &= ~V9FS_ACCESS_MASK;
244 if (strcmp(s, "user") == 0)
245 v9ses->flags |= V9FS_ACCESS_USER;
246 else if (strcmp(s, "any") == 0)
247 v9ses->flags |= V9FS_ACCESS_ANY;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530248 else if (strcmp(s, "client") == 0) {
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530249 v9ses->flags |= V9FS_ACCESS_CLIENT;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530250 } else {
Latchesar Ionkovba176742007-10-17 14:31:07 -0500251 v9ses->flags |= V9FS_ACCESS_SINGLE;
Julia Lawallf1d9e452008-12-19 16:50:22 -0600252 v9ses->uid = simple_strtoul(s, &e, 10);
Prem Karata2dd43b2011-05-06 18:24:18 +0530253 if (*e != '\0') {
254 ret = -EINVAL;
Joe Perches5d385152011-11-28 10:40:46 -0800255 pr_info("Unknown access argument %s\n",
256 s);
Prem Karata2dd43b2011-05-06 18:24:18 +0530257 kfree(s);
258 goto free_and_return;
259 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500260 }
Prem Karata2dd43b2011-05-06 18:24:18 +0530261
Adrian Bunk0a976292007-10-23 13:48:50 -0500262 kfree(s);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500263 break;
264
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800265 case Opt_posixacl:
266#ifdef CONFIG_9P_FS_POSIX_ACL
267 v9ses->flags |= V9FS_POSIX_ACL;
268#else
Joe Perches5d385152011-11-28 10:40:46 -0800269 p9_debug(P9_DEBUG_ERROR,
270 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800271#endif
272 break;
273
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700274 default:
275 continue;
276 }
277 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600278
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600279free_and_return:
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600280 kfree(tmp_options);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500281fail_option_alloc:
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600282 return ret;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700283}
284
285/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700286 * v9fs_session_init - initialize session
287 * @v9ses: session information structure
288 * @dev_name: device being mounted
289 * @data: options
290 *
291 */
292
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500293struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700294 const char *dev_name, char *data)
295{
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700296 int retval = -EINVAL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500297 struct p9_fid *fid;
Jim Meyeringab312672008-03-06 17:10:28 -0600298 int rc;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700299
Jeff Laytone549c132012-09-07 07:55:25 -0400300 v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500301 if (!v9ses->uname)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500302 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700303
Jeff Laytone549c132012-09-07 07:55:25 -0400304 v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500305 if (!v9ses->aname) {
Jeff Laytone549c132012-09-07 07:55:25 -0400306 kfree(v9ses->uname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500307 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700308 }
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +0530309 init_rwsem(&v9ses->rename_sem);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700310
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200311 rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
312 if (rc) {
Jeff Laytone549c132012-09-07 07:55:25 -0400313 kfree(v9ses->aname);
314 kfree(v9ses->uname);
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200315 return ERR_PTR(rc);
316 }
317
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500318 spin_lock(&v9fs_sessionlist_lock);
319 list_add(&v9ses->slist, &v9fs_sessionlist);
320 spin_unlock(&v9fs_sessionlist_lock);
321
Latchesar Ionkovba176742007-10-17 14:31:07 -0500322 v9ses->uid = ~0;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500323 v9ses->dfltuid = V9FS_DEFUID;
324 v9ses->dfltgid = V9FS_DEFGID;
Jim Meyeringab312672008-03-06 17:10:28 -0600325
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500326 v9ses->clnt = p9_client_create(dev_name, data);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500327 if (IS_ERR(v9ses->clnt)) {
328 retval = PTR_ERR(v9ses->clnt);
329 v9ses->clnt = NULL;
Joe Perches5d385152011-11-28 10:40:46 -0800330 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500331 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700332 }
333
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800334 v9ses->flags = V9FS_ACCESS_USER;
335
336 if (p9_is_proto_dotl(v9ses->clnt)) {
337 v9ses->flags = V9FS_ACCESS_CLIENT;
Sripathi Kodi476ada02010-03-17 17:02:38 +0000338 v9ses->flags |= V9FS_PROTO_2000L;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800339 } else if (p9_is_proto_dotu(v9ses->clnt)) {
Sripathi Kodi476ada02010-03-17 17:02:38 +0000340 v9ses->flags |= V9FS_PROTO_2000U;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800341 }
342
343 rc = v9fs_parse_options(v9ses, data);
344 if (rc < 0) {
345 retval = rc;
346 goto error;
347 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500348
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500349 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600350
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530351 if (!v9fs_proto_dotl(v9ses) &&
352 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
353 /*
354 * We support ACCESS_CLIENT only for dotl.
355 * Fall back to ACCESS_USER
356 */
357 v9ses->flags &= ~V9FS_ACCESS_MASK;
358 v9ses->flags |= V9FS_ACCESS_USER;
359 }
360 /*FIXME !! */
Latchesar Ionkovba176742007-10-17 14:31:07 -0500361 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
Aneesh Kumar K.V9ffaf632010-06-01 09:26:18 +0000362 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
Latchesar Ionkovba176742007-10-17 14:31:07 -0500363 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
364
365 v9ses->flags &= ~V9FS_ACCESS_MASK;
366 v9ses->flags |= V9FS_ACCESS_ANY;
367 v9ses->uid = ~0;
368 }
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800369 if (!v9fs_proto_dotl(v9ses) ||
370 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
371 /*
372 * We support ACL checks on clinet only if the protocol is
373 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
374 */
375 v9ses->flags &= ~V9FS_ACL_MASK;
376 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500377
378 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
379 v9ses->aname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500380 if (IS_ERR(fid)) {
381 retval = PTR_ERR(fid);
382 fid = NULL;
Joe Perches5d385152011-11-28 10:40:46 -0800383 p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500384 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700385 }
386
Latchesar Ionkovba176742007-10-17 14:31:07 -0500387 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
388 fid->uid = v9ses->uid;
389 else
390 fid->uid = ~0;
391
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500392#ifdef CONFIG_9P_FSCACHE
393 /* register the session for caching */
394 v9fs_cache_session_get_cookie(v9ses);
395#endif
396
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500397 return fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700398
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500399error:
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200400 bdi_destroy(&v9ses->bdi);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500401 return ERR_PTR(retval);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700402}
403
404/**
405 * v9fs_session_close - shutdown a session
406 * @v9ses: session information structure
407 *
408 */
409
410void v9fs_session_close(struct v9fs_session_info *v9ses)
411{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500412 if (v9ses->clnt) {
413 p9_client_destroy(v9ses->clnt);
414 v9ses->clnt = NULL;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800415 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700416
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500417#ifdef CONFIG_9P_FSCACHE
418 if (v9ses->fscache) {
419 v9fs_cache_session_put_cookie(v9ses);
420 kfree(v9ses->cachetag);
421 }
422#endif
Jeff Laytone549c132012-09-07 07:55:25 -0400423 kfree(v9ses->uname);
424 kfree(v9ses->aname);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500425
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200426 bdi_destroy(&v9ses->bdi);
427
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500428 spin_lock(&v9fs_sessionlist_lock);
429 list_del(&v9ses->slist);
430 spin_unlock(&v9fs_sessionlist_lock);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700431}
432
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700433/**
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600434 * v9fs_session_cancel - terminate a session
435 * @v9ses: session to terminate
436 *
437 * mark transport as disconnected and cancel all pending requests.
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700438 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600439
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700440void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
Joe Perches5d385152011-11-28 10:40:46 -0800441 p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500442 p9_client_disconnect(v9ses->clnt);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700443}
444
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500445/**
446 * v9fs_session_begin_cancel - Begin terminate of a session
447 * @v9ses: session to terminate
448 *
449 * After this call we don't allow any request other than clunk.
450 */
451
452void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
453{
Joe Perches5d385152011-11-28 10:40:46 -0800454 p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500455 p9_client_begin_disconnect(v9ses->clnt);
456}
457
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700458extern int v9fs_error_init(void);
459
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500460static struct kobject *v9fs_kobj;
461
462#ifdef CONFIG_9P_FSCACHE
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700463/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500464 * caches_show - list caches associated with a session
465 *
466 * Returns the size of buffer written.
467 */
468
469static ssize_t caches_show(struct kobject *kobj,
470 struct kobj_attribute *attr,
471 char *buf)
472{
473 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
474 struct v9fs_session_info *v9ses;
475
476 spin_lock(&v9fs_sessionlist_lock);
477 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
478 if (v9ses->cachetag) {
479 n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
480 if (n < 0) {
481 count = n;
482 break;
483 }
484
485 count += n;
486 limit -= n;
487 }
488 }
489
490 spin_unlock(&v9fs_sessionlist_lock);
491 return count;
492}
493
494static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
495#endif /* CONFIG_9P_FSCACHE */
496
497static struct attribute *v9fs_attrs[] = {
498#ifdef CONFIG_9P_FSCACHE
499 &v9fs_attr_cache.attr,
500#endif
501 NULL,
502};
503
504static struct attribute_group v9fs_attr_group = {
505 .attrs = v9fs_attrs,
506};
507
508/**
509 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
510 *
511 */
512
513static int v9fs_sysfs_init(void)
514{
515 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
516 if (!v9fs_kobj)
517 return -ENOMEM;
518
519 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
520 kobject_put(v9fs_kobj);
521 return -ENOMEM;
522 }
523
524 return 0;
525}
526
527/**
528 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
529 *
530 */
531
532static void v9fs_sysfs_cleanup(void)
533{
534 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
535 kobject_put(v9fs_kobj);
536}
537
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530538static void v9fs_inode_init_once(void *foo)
539{
540 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
541#ifdef CONFIG_9P_FSCACHE
542 v9inode->fscache = NULL;
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530543#endif
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000544 memset(&v9inode->qid, 0, sizeof(v9inode->qid));
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530545 inode_init_once(&v9inode->vfs_inode);
546}
547
548/**
549 * v9fs_init_inode_cache - initialize a cache for 9P
550 * Returns 0 on success.
551 */
552static int v9fs_init_inode_cache(void)
553{
554 v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
555 sizeof(struct v9fs_inode),
556 0, (SLAB_RECLAIM_ACCOUNT|
557 SLAB_MEM_SPREAD),
558 v9fs_inode_init_once);
559 if (!v9fs_inode_cache)
560 return -ENOMEM;
561
562 return 0;
563}
564
565/**
566 * v9fs_destroy_inode_cache - destroy the cache of 9P inode
567 *
568 */
569static void v9fs_destroy_inode_cache(void)
570{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000571 /*
572 * Make sure all delayed rcu free inodes are flushed before we
573 * destroy cache.
574 */
575 rcu_barrier();
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530576 kmem_cache_destroy(v9fs_inode_cache);
577}
578
579static int v9fs_cache_register(void)
580{
581 int ret;
582 ret = v9fs_init_inode_cache();
583 if (ret < 0)
584 return ret;
585#ifdef CONFIG_9P_FSCACHE
586 return fscache_register_netfs(&v9fs_cache_netfs);
587#else
588 return ret;
589#endif
590}
591
592static void v9fs_cache_unregister(void)
593{
594 v9fs_destroy_inode_cache();
595#ifdef CONFIG_9P_FSCACHE
596 fscache_unregister_netfs(&v9fs_cache_netfs);
597#endif
598}
599
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500600/**
601 * init_v9fs - Initialize module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700602 *
603 */
604
605static int __init init_v9fs(void)
606{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500607 int err;
Joe Perches5d385152011-11-28 10:40:46 -0800608 pr_info("Installing v9fs 9p2000 file system support\n");
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500609 /* TODO: Setup list of registered trasnport modules */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500610
611 err = v9fs_cache_register();
612 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800613 pr_err("Failed to register v9fs for caching\n");
Al Viro2226a282012-03-17 02:37:05 -0400614 return err;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500615 }
616
617 err = v9fs_sysfs_init();
618 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800619 pr_err("Failed to register with sysfs\n");
Al Viro2226a282012-03-17 02:37:05 -0400620 goto out_cache;
621 }
622 err = register_filesystem(&v9fs_fs_type);
623 if (err < 0) {
624 pr_err("Failed to register filesystem\n");
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500625 goto out_sysfs_cleanup;
626 }
627
628 return 0;
629
630out_sysfs_cleanup:
631 v9fs_sysfs_cleanup();
632
Al Viro2226a282012-03-17 02:37:05 -0400633out_cache:
634 v9fs_cache_unregister();
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500635
636 return err;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700637}
638
639/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500640 * exit_v9fs - shutdown module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700641 *
642 */
643
644static void __exit exit_v9fs(void)
645{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500646 v9fs_sysfs_cleanup();
647 v9fs_cache_unregister();
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700648 unregister_filesystem(&v9fs_fs_type);
649}
650
651module_init(init_v9fs)
652module_exit(exit_v9fs)
653
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500654MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700655MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
656MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
657MODULE_LICENSE("GPL");