blob: 58e6cbce4156fb37a9820297e3a35c83d3524e81 [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 }
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800164 v9ses->dfltuid = make_kuid(current_user_ns(), option);
165 if (!uid_valid(v9ses->dfltuid)) {
166 p9_debug(P9_DEBUG_ERROR,
167 "uid field, but not a uid?\n");
168 ret = -EINVAL;
169 continue;
170 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700171 break;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500172 case Opt_dfltgid:
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530173 r = match_int(&args[0], &option);
174 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800175 p9_debug(P9_DEBUG_ERROR,
176 "integer field, but no integer?\n");
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530177 ret = r;
178 continue;
179 }
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800180 v9ses->dfltgid = make_kgid(current_user_ns(), option);
181 if (!gid_valid(v9ses->dfltgid)) {
182 p9_debug(P9_DEBUG_ERROR,
183 "gid field, but not a gid?\n");
184 ret = -EINVAL;
185 continue;
186 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700187 break;
188 case Opt_afid:
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530189 r = match_int(&args[0], &option);
190 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800191 p9_debug(P9_DEBUG_ERROR,
192 "integer field, but no integer?\n");
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530193 ret = r;
194 continue;
195 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700196 v9ses->afid = option;
197 break;
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800198 case Opt_uname:
Jeff Laytone549c132012-09-07 07:55:25 -0400199 kfree(v9ses->uname);
200 v9ses->uname = match_strdup(&args[0]);
201 if (!v9ses->uname) {
202 ret = -ENOMEM;
203 goto free_and_return;
204 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700205 break;
206 case Opt_remotename:
Jeff Laytone549c132012-09-07 07:55:25 -0400207 kfree(v9ses->aname);
208 v9ses->aname = match_strdup(&args[0]);
209 if (!v9ses->aname) {
210 ret = -ENOMEM;
211 goto free_and_return;
212 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700213 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700214 case Opt_nodevmap:
215 v9ses->nodev = 1;
216 break;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600217 case Opt_cache_loose:
218 v9ses->cache = CACHE_LOOSE;
219 break;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500220 case Opt_fscache:
221 v9ses->cache = CACHE_FSCACHE;
222 break;
223 case Opt_cachetag:
224#ifdef CONFIG_9P_FSCACHE
225 v9ses->cachetag = match_strdup(&args[0]);
226#endif
227 break;
228 case Opt_cache:
229 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600230 if (!s) {
231 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800232 p9_debug(P9_DEBUG_ERROR,
233 "problem allocating copy of cache arg\n");
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600234 goto free_and_return;
235 }
Prem Karata2dd43b2011-05-06 18:24:18 +0530236 ret = get_cache_mode(s);
237 if (ret == -EINVAL) {
238 kfree(s);
239 goto free_and_return;
240 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500241
Prem Karata2dd43b2011-05-06 18:24:18 +0530242 v9ses->cache = ret;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500243 kfree(s);
244 break;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500245
246 case Opt_access:
247 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600248 if (!s) {
249 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800250 p9_debug(P9_DEBUG_ERROR,
251 "problem allocating copy of access arg\n");
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600252 goto free_and_return;
253 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500254
Latchesar Ionkovba176742007-10-17 14:31:07 -0500255 v9ses->flags &= ~V9FS_ACCESS_MASK;
256 if (strcmp(s, "user") == 0)
257 v9ses->flags |= V9FS_ACCESS_USER;
258 else if (strcmp(s, "any") == 0)
259 v9ses->flags |= V9FS_ACCESS_ANY;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530260 else if (strcmp(s, "client") == 0) {
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530261 v9ses->flags |= V9FS_ACCESS_CLIENT;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530262 } else {
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800263 uid_t uid;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500264 v9ses->flags |= V9FS_ACCESS_SINGLE;
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800265 uid = simple_strtoul(s, &e, 10);
Prem Karata2dd43b2011-05-06 18:24:18 +0530266 if (*e != '\0') {
267 ret = -EINVAL;
Joe Perches5d385152011-11-28 10:40:46 -0800268 pr_info("Unknown access argument %s\n",
269 s);
Prem Karata2dd43b2011-05-06 18:24:18 +0530270 kfree(s);
271 goto free_and_return;
272 }
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800273 v9ses->uid = make_kuid(current_user_ns(), uid);
274 if (!uid_valid(v9ses->uid)) {
275 ret = -EINVAL;
276 pr_info("Uknown uid %s\n", s);
277 kfree(s);
278 goto free_and_return;
279 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500280 }
Prem Karata2dd43b2011-05-06 18:24:18 +0530281
Adrian Bunk0a976292007-10-23 13:48:50 -0500282 kfree(s);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500283 break;
284
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800285 case Opt_posixacl:
286#ifdef CONFIG_9P_FS_POSIX_ACL
287 v9ses->flags |= V9FS_POSIX_ACL;
288#else
Joe Perches5d385152011-11-28 10:40:46 -0800289 p9_debug(P9_DEBUG_ERROR,
290 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800291#endif
292 break;
293
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700294 default:
295 continue;
296 }
297 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600298
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600299free_and_return:
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600300 kfree(tmp_options);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500301fail_option_alloc:
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600302 return ret;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700303}
304
305/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700306 * v9fs_session_init - initialize session
307 * @v9ses: session information structure
308 * @dev_name: device being mounted
309 * @data: options
310 *
311 */
312
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500313struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700314 const char *dev_name, char *data)
315{
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700316 int retval = -EINVAL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500317 struct p9_fid *fid;
Jim Meyeringab312672008-03-06 17:10:28 -0600318 int rc;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700319
Jeff Laytone549c132012-09-07 07:55:25 -0400320 v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500321 if (!v9ses->uname)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500322 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700323
Jeff Laytone549c132012-09-07 07:55:25 -0400324 v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500325 if (!v9ses->aname) {
Jeff Laytone549c132012-09-07 07:55:25 -0400326 kfree(v9ses->uname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500327 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700328 }
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +0530329 init_rwsem(&v9ses->rename_sem);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700330
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200331 rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
332 if (rc) {
Jeff Laytone549c132012-09-07 07:55:25 -0400333 kfree(v9ses->aname);
334 kfree(v9ses->uname);
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200335 return ERR_PTR(rc);
336 }
337
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500338 spin_lock(&v9fs_sessionlist_lock);
339 list_add(&v9ses->slist, &v9fs_sessionlist);
340 spin_unlock(&v9fs_sessionlist_lock);
341
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800342 v9ses->uid = INVALID_UID;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500343 v9ses->dfltuid = V9FS_DEFUID;
344 v9ses->dfltgid = V9FS_DEFGID;
Jim Meyeringab312672008-03-06 17:10:28 -0600345
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500346 v9ses->clnt = p9_client_create(dev_name, data);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500347 if (IS_ERR(v9ses->clnt)) {
348 retval = PTR_ERR(v9ses->clnt);
349 v9ses->clnt = NULL;
Joe Perches5d385152011-11-28 10:40:46 -0800350 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500351 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700352 }
353
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800354 v9ses->flags = V9FS_ACCESS_USER;
355
356 if (p9_is_proto_dotl(v9ses->clnt)) {
357 v9ses->flags = V9FS_ACCESS_CLIENT;
Sripathi Kodi476ada02010-03-17 17:02:38 +0000358 v9ses->flags |= V9FS_PROTO_2000L;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800359 } else if (p9_is_proto_dotu(v9ses->clnt)) {
Sripathi Kodi476ada02010-03-17 17:02:38 +0000360 v9ses->flags |= V9FS_PROTO_2000U;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800361 }
362
363 rc = v9fs_parse_options(v9ses, data);
364 if (rc < 0) {
365 retval = rc;
366 goto error;
367 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500368
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500369 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600370
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530371 if (!v9fs_proto_dotl(v9ses) &&
372 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
373 /*
374 * We support ACCESS_CLIENT only for dotl.
375 * Fall back to ACCESS_USER
376 */
377 v9ses->flags &= ~V9FS_ACCESS_MASK;
378 v9ses->flags |= V9FS_ACCESS_USER;
379 }
380 /*FIXME !! */
Latchesar Ionkovba176742007-10-17 14:31:07 -0500381 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
Aneesh Kumar K.V9ffaf632010-06-01 09:26:18 +0000382 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
Latchesar Ionkovba176742007-10-17 14:31:07 -0500383 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
384
385 v9ses->flags &= ~V9FS_ACCESS_MASK;
386 v9ses->flags |= V9FS_ACCESS_ANY;
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800387 v9ses->uid = INVALID_UID;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500388 }
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800389 if (!v9fs_proto_dotl(v9ses) ||
390 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
391 /*
392 * We support ACL checks on clinet only if the protocol is
393 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
394 */
395 v9ses->flags &= ~V9FS_ACL_MASK;
396 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500397
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -0800398 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
Latchesar Ionkovba176742007-10-17 14:31:07 -0500399 v9ses->aname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500400 if (IS_ERR(fid)) {
401 retval = PTR_ERR(fid);
402 fid = NULL;
Joe Perches5d385152011-11-28 10:40:46 -0800403 p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500404 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700405 }
406
Latchesar Ionkovba176742007-10-17 14:31:07 -0500407 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
408 fid->uid = v9ses->uid;
409 else
Eric W. Biedermanb4642552013-01-30 11:48:53 -0800410 fid->uid = INVALID_UID;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500411
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500412#ifdef CONFIG_9P_FSCACHE
413 /* register the session for caching */
414 v9fs_cache_session_get_cookie(v9ses);
415#endif
416
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500417 return fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700418
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500419error:
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200420 bdi_destroy(&v9ses->bdi);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500421 return ERR_PTR(retval);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700422}
423
424/**
425 * v9fs_session_close - shutdown a session
426 * @v9ses: session information structure
427 *
428 */
429
430void v9fs_session_close(struct v9fs_session_info *v9ses)
431{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500432 if (v9ses->clnt) {
433 p9_client_destroy(v9ses->clnt);
434 v9ses->clnt = NULL;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800435 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700436
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500437#ifdef CONFIG_9P_FSCACHE
438 if (v9ses->fscache) {
439 v9fs_cache_session_put_cookie(v9ses);
440 kfree(v9ses->cachetag);
441 }
442#endif
Jeff Laytone549c132012-09-07 07:55:25 -0400443 kfree(v9ses->uname);
444 kfree(v9ses->aname);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500445
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200446 bdi_destroy(&v9ses->bdi);
447
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500448 spin_lock(&v9fs_sessionlist_lock);
449 list_del(&v9ses->slist);
450 spin_unlock(&v9fs_sessionlist_lock);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700451}
452
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700453/**
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600454 * v9fs_session_cancel - terminate a session
455 * @v9ses: session to terminate
456 *
457 * mark transport as disconnected and cancel all pending requests.
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700458 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600459
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700460void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
Joe Perches5d385152011-11-28 10:40:46 -0800461 p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500462 p9_client_disconnect(v9ses->clnt);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700463}
464
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500465/**
466 * v9fs_session_begin_cancel - Begin terminate of a session
467 * @v9ses: session to terminate
468 *
469 * After this call we don't allow any request other than clunk.
470 */
471
472void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
473{
Joe Perches5d385152011-11-28 10:40:46 -0800474 p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500475 p9_client_begin_disconnect(v9ses->clnt);
476}
477
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700478extern int v9fs_error_init(void);
479
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500480static struct kobject *v9fs_kobj;
481
482#ifdef CONFIG_9P_FSCACHE
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700483/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500484 * caches_show - list caches associated with a session
485 *
486 * Returns the size of buffer written.
487 */
488
489static ssize_t caches_show(struct kobject *kobj,
490 struct kobj_attribute *attr,
491 char *buf)
492{
493 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
494 struct v9fs_session_info *v9ses;
495
496 spin_lock(&v9fs_sessionlist_lock);
497 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
498 if (v9ses->cachetag) {
499 n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
500 if (n < 0) {
501 count = n;
502 break;
503 }
504
505 count += n;
506 limit -= n;
507 }
508 }
509
510 spin_unlock(&v9fs_sessionlist_lock);
511 return count;
512}
513
514static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
515#endif /* CONFIG_9P_FSCACHE */
516
517static struct attribute *v9fs_attrs[] = {
518#ifdef CONFIG_9P_FSCACHE
519 &v9fs_attr_cache.attr,
520#endif
521 NULL,
522};
523
524static struct attribute_group v9fs_attr_group = {
525 .attrs = v9fs_attrs,
526};
527
528/**
529 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
530 *
531 */
532
533static int v9fs_sysfs_init(void)
534{
535 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
536 if (!v9fs_kobj)
537 return -ENOMEM;
538
539 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
540 kobject_put(v9fs_kobj);
541 return -ENOMEM;
542 }
543
544 return 0;
545}
546
547/**
548 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
549 *
550 */
551
552static void v9fs_sysfs_cleanup(void)
553{
554 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
555 kobject_put(v9fs_kobj);
556}
557
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530558static void v9fs_inode_init_once(void *foo)
559{
560 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
561#ifdef CONFIG_9P_FSCACHE
562 v9inode->fscache = NULL;
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530563#endif
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000564 memset(&v9inode->qid, 0, sizeof(v9inode->qid));
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530565 inode_init_once(&v9inode->vfs_inode);
566}
567
568/**
569 * v9fs_init_inode_cache - initialize a cache for 9P
570 * Returns 0 on success.
571 */
572static int v9fs_init_inode_cache(void)
573{
574 v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
575 sizeof(struct v9fs_inode),
576 0, (SLAB_RECLAIM_ACCOUNT|
577 SLAB_MEM_SPREAD),
578 v9fs_inode_init_once);
579 if (!v9fs_inode_cache)
580 return -ENOMEM;
581
582 return 0;
583}
584
585/**
586 * v9fs_destroy_inode_cache - destroy the cache of 9P inode
587 *
588 */
589static void v9fs_destroy_inode_cache(void)
590{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000591 /*
592 * Make sure all delayed rcu free inodes are flushed before we
593 * destroy cache.
594 */
595 rcu_barrier();
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530596 kmem_cache_destroy(v9fs_inode_cache);
597}
598
599static int v9fs_cache_register(void)
600{
601 int ret;
602 ret = v9fs_init_inode_cache();
603 if (ret < 0)
604 return ret;
605#ifdef CONFIG_9P_FSCACHE
606 return fscache_register_netfs(&v9fs_cache_netfs);
607#else
608 return ret;
609#endif
610}
611
612static void v9fs_cache_unregister(void)
613{
614 v9fs_destroy_inode_cache();
615#ifdef CONFIG_9P_FSCACHE
616 fscache_unregister_netfs(&v9fs_cache_netfs);
617#endif
618}
619
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500620/**
621 * init_v9fs - Initialize module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700622 *
623 */
624
625static int __init init_v9fs(void)
626{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500627 int err;
Joe Perches5d385152011-11-28 10:40:46 -0800628 pr_info("Installing v9fs 9p2000 file system support\n");
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500629 /* TODO: Setup list of registered trasnport modules */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500630
631 err = v9fs_cache_register();
632 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800633 pr_err("Failed to register v9fs for caching\n");
Al Viro2226a282012-03-17 02:37:05 -0400634 return err;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500635 }
636
637 err = v9fs_sysfs_init();
638 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800639 pr_err("Failed to register with sysfs\n");
Al Viro2226a282012-03-17 02:37:05 -0400640 goto out_cache;
641 }
642 err = register_filesystem(&v9fs_fs_type);
643 if (err < 0) {
644 pr_err("Failed to register filesystem\n");
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500645 goto out_sysfs_cleanup;
646 }
647
648 return 0;
649
650out_sysfs_cleanup:
651 v9fs_sysfs_cleanup();
652
Al Viro2226a282012-03-17 02:37:05 -0400653out_cache:
654 v9fs_cache_unregister();
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500655
656 return err;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700657}
658
659/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500660 * exit_v9fs - shutdown module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700661 *
662 */
663
664static void __exit exit_v9fs(void)
665{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500666 v9fs_sysfs_cleanup();
667 v9fs_cache_unregister();
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700668 unregister_filesystem(&v9fs_fs_type);
669}
670
671module_init(init_v9fs)
672module_exit(exit_v9fs)
673
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500674MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700675MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
676MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
677MODULE_LICENSE("GPL");