blob: ef96618861129ea023f6d9b4e0b77c65b452b997 [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
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);
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +053042struct kmem_cache *v9fs_inode_cache;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070043
44/*
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050045 * Option Parsing (code inspired by NFS code)
46 * NOTE: each transport will parse its own options
47 */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070048
49enum {
50 /* Options that take integer arguments */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060051 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070052 /* String options */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050053 Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070054 /* Options that take no arguments */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060055 Opt_nodevmap,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060056 /* Cache options */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050057 Opt_cache_loose, Opt_fscache,
Latchesar Ionkovba176742007-10-17 14:31:07 -050058 /* Access options */
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -080059 Opt_access, Opt_posixacl,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070060 /* Error token */
61 Opt_err
62};
63
Steven Whitehousea447c092008-10-13 10:46:57 +010064static const match_table_t tokens = {
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -050065 {Opt_debug, "debug=%x"},
Latchesar Ionkovbd32b822007-10-17 14:31:07 -050066 {Opt_dfltuid, "dfltuid=%u"},
67 {Opt_dfltgid, "dfltgid=%u"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070068 {Opt_afid, "afid=%u"},
Eric Van Hensbergen67543e52006-03-25 03:07:29 -080069 {Opt_uname, "uname=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070070 {Opt_remotename, "aname=%s"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070071 {Opt_nodevmap, "nodevmap"},
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050072 {Opt_cache, "cache=%s"},
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060073 {Opt_cache_loose, "loose"},
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050074 {Opt_fscache, "fscache"},
75 {Opt_cachetag, "cachetag=%s"},
Latchesar Ionkovba176742007-10-17 14:31:07 -050076 {Opt_access, "access=%s"},
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -080077 {Opt_posixacl, "posixacl"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070078 {Opt_err, NULL}
79};
80
Prem Karat6170eea2011-05-06 18:24:18 +053081/* Interpret mount options for cache mode */
82static int get_cache_mode(char *s)
83{
84 int version = -EINVAL;
85
86 if (!strcmp(s, "loose")) {
87 version = CACHE_LOOSE;
88 P9_DPRINTK(P9_DEBUG_9P, "Cache mode: loose\n");
89 } else if (!strcmp(s, "fscache")) {
90 version = CACHE_FSCACHE;
91 P9_DPRINTK(P9_DEBUG_9P, "Cache mode: fscache\n");
92 } else if (!strcmp(s, "none")) {
93 version = CACHE_NONE;
94 P9_DPRINTK(P9_DEBUG_9P, "Cache mode: none\n");
95 } else
96 printk(KERN_INFO "9p: Unknown Cache mode %s.\n", s);
97 return version;
98}
99
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700100/**
101 * v9fs_parse_options - parse mount options into session structure
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700102 * @v9ses: existing v9fs session information
103 *
Jim Meyeringab312672008-03-06 17:10:28 -0600104 * Return 0 upon success, -ERRNO upon failure.
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700105 */
106
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500107static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700108{
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600109 char *options, *tmp_options;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700110 substring_t args[MAX_OPT_ARGS];
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500111 char *p;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600112 int option = 0;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500113 char *s, *e;
Jim Meyeringab312672008-03-06 17:10:28 -0600114 int ret = 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700115
116 /* setup defaults */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700117 v9ses->afid = ~0;
118 v9ses->debug = 0;
Prem Karat6170eea2011-05-06 18:24:18 +0530119 v9ses->cache = CACHE_NONE;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500120#ifdef CONFIG_9P_FSCACHE
121 v9ses->cachetag = NULL;
122#endif
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700123
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500124 if (!opts)
Jim Meyeringab312672008-03-06 17:10:28 -0600125 return 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700126
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600127 tmp_options = kstrdup(opts, GFP_KERNEL);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600128 if (!tmp_options) {
129 ret = -ENOMEM;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500130 goto fail_option_alloc;
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600131 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600132 options = tmp_options;
Jim Meyeringab312672008-03-06 17:10:28 -0600133
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700134 while ((p = strsep(&options, ",")) != NULL) {
135 int token;
136 if (!*p)
137 continue;
138 token = match_token(p, tokens, args);
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800139 if (token < Opt_uname) {
Jim Meyeringab312672008-03-06 17:10:28 -0600140 int r = match_int(&args[0], &option);
141 if (r < 0) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500142 P9_DPRINTK(P9_DEBUG_ERROR,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700143 "integer field, but no integer?\n");
Jim Meyeringab312672008-03-06 17:10:28 -0600144 ret = r;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700145 continue;
146 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700147 }
148 switch (token) {
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500149 case Opt_debug:
150 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:
157 v9ses->dfltuid = option;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700158 break;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500159 case Opt_dfltgid:
160 v9ses->dfltgid = option;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700161 break;
162 case Opt_afid:
163 v9ses->afid = option;
164 break;
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800165 case Opt_uname:
Markus Armbrusterb32a09d2008-02-26 09:57:11 -0600166 match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700167 break;
168 case Opt_remotename:
Markus Armbrusterb32a09d2008-02-26 09:57:11 -0600169 match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700170 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700171 case Opt_nodevmap:
172 v9ses->nodev = 1;
173 break;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600174 case Opt_cache_loose:
175 v9ses->cache = CACHE_LOOSE;
176 break;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500177 case Opt_fscache:
178 v9ses->cache = CACHE_FSCACHE;
179 break;
180 case Opt_cachetag:
181#ifdef CONFIG_9P_FSCACHE
182 v9ses->cachetag = match_strdup(&args[0]);
183#endif
184 break;
185 case Opt_cache:
186 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600187 if (!s) {
188 ret = -ENOMEM;
189 P9_DPRINTK(P9_DEBUG_ERROR,
190 "problem allocating copy of cache arg\n");
191 goto free_and_return;
192 }
Prem Karat6170eea2011-05-06 18:24:18 +0530193 ret = get_cache_mode(s);
194 if (ret == -EINVAL) {
195 kfree(s);
196 goto free_and_return;
197 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500198
Prem Karat6170eea2011-05-06 18:24:18 +0530199 v9ses->cache = ret;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500200 kfree(s);
201 break;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500202
203 case Opt_access:
204 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600205 if (!s) {
206 ret = -ENOMEM;
207 P9_DPRINTK(P9_DEBUG_ERROR,
208 "problem allocating copy of access arg\n");
209 goto free_and_return;
210 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500211
Latchesar Ionkovba176742007-10-17 14:31:07 -0500212 v9ses->flags &= ~V9FS_ACCESS_MASK;
213 if (strcmp(s, "user") == 0)
214 v9ses->flags |= V9FS_ACCESS_USER;
215 else if (strcmp(s, "any") == 0)
216 v9ses->flags |= V9FS_ACCESS_ANY;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530217 else if (strcmp(s, "client") == 0) {
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530218 v9ses->flags |= V9FS_ACCESS_CLIENT;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530219 } else {
Latchesar Ionkovba176742007-10-17 14:31:07 -0500220 v9ses->flags |= V9FS_ACCESS_SINGLE;
Julia Lawallf1d9e452008-12-19 16:50:22 -0600221 v9ses->uid = simple_strtoul(s, &e, 10);
Prem Karat6170eea2011-05-06 18:24:18 +0530222 if (*e != '\0') {
223 ret = -EINVAL;
224 printk(KERN_INFO "9p: Unknown access "
225 "argument %s.\n", s);
226 kfree(s);
227 goto free_and_return;
228 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500229 }
Prem Karat6170eea2011-05-06 18:24:18 +0530230
Adrian Bunk0a976292007-10-23 13:48:50 -0500231 kfree(s);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500232 break;
233
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800234 case Opt_posixacl:
235#ifdef CONFIG_9P_FS_POSIX_ACL
236 v9ses->flags |= V9FS_POSIX_ACL;
237#else
238 P9_DPRINTK(P9_DEBUG_ERROR,
239 "Not defined CONFIG_9P_FS_POSIX_ACL. "
240 "Ignoring posixacl option\n");
241#endif
242 break;
243
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700244 default:
245 continue;
246 }
247 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600248
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600249free_and_return:
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600250 kfree(tmp_options);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500251fail_option_alloc:
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600252 return ret;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700253}
254
255/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700256 * v9fs_session_init - initialize session
257 * @v9ses: session information structure
258 * @dev_name: device being mounted
259 * @data: options
260 *
261 */
262
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500263struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700264 const char *dev_name, char *data)
265{
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700266 int retval = -EINVAL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500267 struct p9_fid *fid;
Jim Meyeringab312672008-03-06 17:10:28 -0600268 int rc;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700269
Latchesar Ionkovba176742007-10-17 14:31:07 -0500270 v9ses->uname = __getname();
271 if (!v9ses->uname)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500272 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700273
Latchesar Ionkovba176742007-10-17 14:31:07 -0500274 v9ses->aname = __getname();
275 if (!v9ses->aname) {
276 __putname(v9ses->uname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500277 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700278 }
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +0530279 init_rwsem(&v9ses->rename_sem);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700280
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200281 rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
282 if (rc) {
283 __putname(v9ses->aname);
284 __putname(v9ses->uname);
285 return ERR_PTR(rc);
286 }
287
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500288 spin_lock(&v9fs_sessionlist_lock);
289 list_add(&v9ses->slist, &v9fs_sessionlist);
290 spin_unlock(&v9fs_sessionlist_lock);
291
Latchesar Ionkovba176742007-10-17 14:31:07 -0500292 strcpy(v9ses->uname, V9FS_DEFUSER);
293 strcpy(v9ses->aname, V9FS_DEFANAME);
294 v9ses->uid = ~0;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500295 v9ses->dfltuid = V9FS_DEFUID;
296 v9ses->dfltgid = V9FS_DEFGID;
Jim Meyeringab312672008-03-06 17:10:28 -0600297
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500298 v9ses->clnt = p9_client_create(dev_name, data);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500299 if (IS_ERR(v9ses->clnt)) {
300 retval = PTR_ERR(v9ses->clnt);
301 v9ses->clnt = NULL;
302 P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
303 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700304 }
305
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800306 v9ses->flags = V9FS_ACCESS_USER;
307
308 if (p9_is_proto_dotl(v9ses->clnt)) {
309 v9ses->flags = V9FS_ACCESS_CLIENT;
Sripathi Kodi476ada02010-03-17 17:02:38 +0000310 v9ses->flags |= V9FS_PROTO_2000L;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800311 } else if (p9_is_proto_dotu(v9ses->clnt)) {
Sripathi Kodi476ada02010-03-17 17:02:38 +0000312 v9ses->flags |= V9FS_PROTO_2000U;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800313 }
314
315 rc = v9fs_parse_options(v9ses, data);
316 if (rc < 0) {
317 retval = rc;
318 goto error;
319 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500320
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500321 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600322
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530323 if (!v9fs_proto_dotl(v9ses) &&
324 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
325 /*
326 * We support ACCESS_CLIENT only for dotl.
327 * Fall back to ACCESS_USER
328 */
329 v9ses->flags &= ~V9FS_ACCESS_MASK;
330 v9ses->flags |= V9FS_ACCESS_USER;
331 }
332 /*FIXME !! */
Latchesar Ionkovba176742007-10-17 14:31:07 -0500333 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
Aneesh Kumar K.V9ffaf632010-06-01 09:26:18 +0000334 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
Latchesar Ionkovba176742007-10-17 14:31:07 -0500335 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
336
337 v9ses->flags &= ~V9FS_ACCESS_MASK;
338 v9ses->flags |= V9FS_ACCESS_ANY;
339 v9ses->uid = ~0;
340 }
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800341 if (!v9fs_proto_dotl(v9ses) ||
342 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
343 /*
344 * We support ACL checks on clinet only if the protocol is
345 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
346 */
347 v9ses->flags &= ~V9FS_ACL_MASK;
348 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500349
350 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
351 v9ses->aname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500352 if (IS_ERR(fid)) {
353 retval = PTR_ERR(fid);
354 fid = NULL;
355 P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
356 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700357 }
358
Latchesar Ionkovba176742007-10-17 14:31:07 -0500359 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
360 fid->uid = v9ses->uid;
361 else
362 fid->uid = ~0;
363
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500364#ifdef CONFIG_9P_FSCACHE
365 /* register the session for caching */
366 v9fs_cache_session_get_cookie(v9ses);
367#endif
368
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500369 return fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700370
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500371error:
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200372 bdi_destroy(&v9ses->bdi);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500373 return ERR_PTR(retval);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700374}
375
376/**
377 * v9fs_session_close - shutdown a session
378 * @v9ses: session information structure
379 *
380 */
381
382void v9fs_session_close(struct v9fs_session_info *v9ses)
383{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500384 if (v9ses->clnt) {
385 p9_client_destroy(v9ses->clnt);
386 v9ses->clnt = NULL;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800387 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700388
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500389#ifdef CONFIG_9P_FSCACHE
390 if (v9ses->fscache) {
391 v9fs_cache_session_put_cookie(v9ses);
392 kfree(v9ses->cachetag);
393 }
394#endif
Latchesar Ionkovba176742007-10-17 14:31:07 -0500395 __putname(v9ses->uname);
396 __putname(v9ses->aname);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500397
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200398 bdi_destroy(&v9ses->bdi);
399
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500400 spin_lock(&v9fs_sessionlist_lock);
401 list_del(&v9ses->slist);
402 spin_unlock(&v9fs_sessionlist_lock);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700403}
404
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700405/**
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600406 * v9fs_session_cancel - terminate a session
407 * @v9ses: session to terminate
408 *
409 * mark transport as disconnected and cancel all pending requests.
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700410 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600411
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700412void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500413 P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
414 p9_client_disconnect(v9ses->clnt);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700415}
416
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500417/**
418 * v9fs_session_begin_cancel - Begin terminate of a session
419 * @v9ses: session to terminate
420 *
421 * After this call we don't allow any request other than clunk.
422 */
423
424void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
425{
426 P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
427 p9_client_begin_disconnect(v9ses->clnt);
428}
429
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700430extern int v9fs_error_init(void);
431
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500432static struct kobject *v9fs_kobj;
433
434#ifdef CONFIG_9P_FSCACHE
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700435/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500436 * caches_show - list caches associated with a session
437 *
438 * Returns the size of buffer written.
439 */
440
441static ssize_t caches_show(struct kobject *kobj,
442 struct kobj_attribute *attr,
443 char *buf)
444{
445 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
446 struct v9fs_session_info *v9ses;
447
448 spin_lock(&v9fs_sessionlist_lock);
449 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
450 if (v9ses->cachetag) {
451 n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
452 if (n < 0) {
453 count = n;
454 break;
455 }
456
457 count += n;
458 limit -= n;
459 }
460 }
461
462 spin_unlock(&v9fs_sessionlist_lock);
463 return count;
464}
465
466static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
467#endif /* CONFIG_9P_FSCACHE */
468
469static struct attribute *v9fs_attrs[] = {
470#ifdef CONFIG_9P_FSCACHE
471 &v9fs_attr_cache.attr,
472#endif
473 NULL,
474};
475
476static struct attribute_group v9fs_attr_group = {
477 .attrs = v9fs_attrs,
478};
479
480/**
481 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
482 *
483 */
484
485static int v9fs_sysfs_init(void)
486{
487 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
488 if (!v9fs_kobj)
489 return -ENOMEM;
490
491 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
492 kobject_put(v9fs_kobj);
493 return -ENOMEM;
494 }
495
496 return 0;
497}
498
499/**
500 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
501 *
502 */
503
504static void v9fs_sysfs_cleanup(void)
505{
506 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
507 kobject_put(v9fs_kobj);
508}
509
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530510static void v9fs_inode_init_once(void *foo)
511{
512 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
513#ifdef CONFIG_9P_FSCACHE
514 v9inode->fscache = NULL;
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530515#endif
Aneesh Kumar K.Ve38b21e2011-07-11 16:40:59 +0000516 memset(&v9inode->qid, 0, sizeof(v9inode->qid));
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530517 inode_init_once(&v9inode->vfs_inode);
518}
519
520/**
521 * v9fs_init_inode_cache - initialize a cache for 9P
522 * Returns 0 on success.
523 */
524static int v9fs_init_inode_cache(void)
525{
526 v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
527 sizeof(struct v9fs_inode),
528 0, (SLAB_RECLAIM_ACCOUNT|
529 SLAB_MEM_SPREAD),
530 v9fs_inode_init_once);
531 if (!v9fs_inode_cache)
532 return -ENOMEM;
533
534 return 0;
535}
536
537/**
538 * v9fs_destroy_inode_cache - destroy the cache of 9P inode
539 *
540 */
541static void v9fs_destroy_inode_cache(void)
542{
543 kmem_cache_destroy(v9fs_inode_cache);
544}
545
546static int v9fs_cache_register(void)
547{
548 int ret;
549 ret = v9fs_init_inode_cache();
550 if (ret < 0)
551 return ret;
552#ifdef CONFIG_9P_FSCACHE
553 return fscache_register_netfs(&v9fs_cache_netfs);
554#else
555 return ret;
556#endif
557}
558
559static void v9fs_cache_unregister(void)
560{
561 v9fs_destroy_inode_cache();
562#ifdef CONFIG_9P_FSCACHE
563 fscache_unregister_netfs(&v9fs_cache_netfs);
564#endif
565}
566
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500567/**
568 * init_v9fs - Initialize module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700569 *
570 */
571
572static int __init init_v9fs(void)
573{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500574 int err;
Eric Van Hensbergenf94b3472007-01-26 00:57:04 -0800575 printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500576 /* TODO: Setup list of registered trasnport modules */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500577 err = register_filesystem(&v9fs_fs_type);
578 if (err < 0) {
579 printk(KERN_ERR "Failed to register filesystem\n");
580 return err;
581 }
582
583 err = v9fs_cache_register();
584 if (err < 0) {
585 printk(KERN_ERR "Failed to register v9fs for caching\n");
586 goto out_fs_unreg;
587 }
588
589 err = v9fs_sysfs_init();
590 if (err < 0) {
591 printk(KERN_ERR "Failed to register with sysfs\n");
592 goto out_sysfs_cleanup;
593 }
594
595 return 0;
596
597out_sysfs_cleanup:
598 v9fs_sysfs_cleanup();
599
600out_fs_unreg:
601 unregister_filesystem(&v9fs_fs_type);
602
603 return err;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700604}
605
606/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500607 * exit_v9fs - shutdown module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700608 *
609 */
610
611static void __exit exit_v9fs(void)
612{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500613 v9fs_sysfs_cleanup();
614 v9fs_cache_unregister();
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700615 unregister_filesystem(&v9fs_fs_type);
616}
617
618module_init(init_v9fs)
619module_exit(exit_v9fs)
620
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500621MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700622MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
623MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
624MODULE_LICENSE("GPL");