blob: 14da82564f4eef3e271c2cf891582dac45190ece [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 */
Dominique Martinetfb89b452014-01-10 13:44:09 +010059 Opt_cache_loose, Opt_fscache, Opt_mmap,
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"},
Dominique Martinetfb89b452014-01-10 13:44:09 +010077 {Opt_mmap, "mmap"},
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050078 {Opt_cachetag, "cachetag=%s"},
Latchesar Ionkovba176742007-10-17 14:31:07 -050079 {Opt_access, "access=%s"},
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -080080 {Opt_posixacl, "posixacl"},
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070081 {Opt_err, NULL}
82};
83
Prem Karata2dd43b2011-05-06 18:24:18 +053084/* Interpret mount options for cache mode */
85static int get_cache_mode(char *s)
86{
87 int version = -EINVAL;
88
89 if (!strcmp(s, "loose")) {
90 version = CACHE_LOOSE;
Joe Perches5d385152011-11-28 10:40:46 -080091 p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
Prem Karata2dd43b2011-05-06 18:24:18 +053092 } else if (!strcmp(s, "fscache")) {
93 version = CACHE_FSCACHE;
Joe Perches5d385152011-11-28 10:40:46 -080094 p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
Dominique Martinetfb89b452014-01-10 13:44:09 +010095 } else if (!strcmp(s, "mmap")) {
96 version = CACHE_MMAP;
97 p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
Prem Karata2dd43b2011-05-06 18:24:18 +053098 } else if (!strcmp(s, "none")) {
99 version = CACHE_NONE;
Joe Perches5d385152011-11-28 10:40:46 -0800100 p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
Prem Karata2dd43b2011-05-06 18:24:18 +0530101 } else
Joe Perches5d385152011-11-28 10:40:46 -0800102 pr_info("Unknown Cache mode %s\n", s);
Prem Karata2dd43b2011-05-06 18:24:18 +0530103 return version;
104}
105
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700106/**
107 * v9fs_parse_options - parse mount options into session structure
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700108 * @v9ses: existing v9fs session information
109 *
Jim Meyeringab312672008-03-06 17:10:28 -0600110 * Return 0 upon success, -ERRNO upon failure.
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700111 */
112
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500113static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700114{
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600115 char *options, *tmp_options;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700116 substring_t args[MAX_OPT_ARGS];
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500117 char *p;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600118 int option = 0;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500119 char *s, *e;
Jim Meyeringab312672008-03-06 17:10:28 -0600120 int ret = 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700121
122 /* setup defaults */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700123 v9ses->afid = ~0;
124 v9ses->debug = 0;
Prem Karata2dd43b2011-05-06 18:24:18 +0530125 v9ses->cache = CACHE_NONE;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500126#ifdef CONFIG_9P_FSCACHE
127 v9ses->cachetag = NULL;
128#endif
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700129
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500130 if (!opts)
Jim Meyeringab312672008-03-06 17:10:28 -0600131 return 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700132
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600133 tmp_options = kstrdup(opts, GFP_KERNEL);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600134 if (!tmp_options) {
135 ret = -ENOMEM;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500136 goto fail_option_alloc;
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600137 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600138 options = tmp_options;
Jim Meyeringab312672008-03-06 17:10:28 -0600139
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700140 while ((p = strsep(&options, ",")) != NULL) {
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530141 int token, r;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700142 if (!*p)
143 continue;
144 token = match_token(p, tokens, args);
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530145 switch (token) {
146 case Opt_debug:
147 r = match_int(&args[0], &option);
Jim Meyeringab312672008-03-06 17:10:28 -0600148 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800149 p9_debug(P9_DEBUG_ERROR,
150 "integer field, but no integer?\n");
Jim Meyeringab312672008-03-06 17:10:28 -0600151 ret = r;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700152 continue;
153 }
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500154 v9ses->debug = option;
Eric Van Hensbergen10fa16e2007-07-16 16:02:49 -0500155#ifdef CONFIG_NET_9P_DEBUG
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500156 p9_debug_level = option;
Eric Van Hensbergen10fa16e2007-07-16 16:02:49 -0500157#endif
Eric Van Hensbergen9e2f6682007-07-13 13:05:21 -0500158 break;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600159
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500160 case Opt_dfltuid:
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530161 r = match_int(&args[0], &option);
162 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800163 p9_debug(P9_DEBUG_ERROR,
164 "integer field, but no integer?\n");
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530165 ret = r;
166 continue;
167 }
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800168 v9ses->dfltuid = make_kuid(current_user_ns(), option);
169 if (!uid_valid(v9ses->dfltuid)) {
170 p9_debug(P9_DEBUG_ERROR,
171 "uid field, but not a uid?\n");
172 ret = -EINVAL;
173 continue;
174 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700175 break;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500176 case Opt_dfltgid:
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 W. Biederman76ed23a2013-01-30 11:57:40 -0800184 v9ses->dfltgid = make_kgid(current_user_ns(), option);
185 if (!gid_valid(v9ses->dfltgid)) {
186 p9_debug(P9_DEBUG_ERROR,
187 "gid field, but not a gid?\n");
188 ret = -EINVAL;
189 continue;
190 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700191 break;
192 case Opt_afid:
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530193 r = match_int(&args[0], &option);
194 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800195 p9_debug(P9_DEBUG_ERROR,
196 "integer field, but no integer?\n");
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530197 ret = r;
198 continue;
199 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700200 v9ses->afid = option;
201 break;
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800202 case Opt_uname:
Jeff Laytone549c132012-09-07 07:55:25 -0400203 kfree(v9ses->uname);
204 v9ses->uname = match_strdup(&args[0]);
205 if (!v9ses->uname) {
206 ret = -ENOMEM;
207 goto free_and_return;
208 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700209 break;
210 case Opt_remotename:
Jeff Laytone549c132012-09-07 07:55:25 -0400211 kfree(v9ses->aname);
212 v9ses->aname = match_strdup(&args[0]);
213 if (!v9ses->aname) {
214 ret = -ENOMEM;
215 goto free_and_return;
216 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700217 break;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700218 case Opt_nodevmap:
219 v9ses->nodev = 1;
220 break;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600221 case Opt_cache_loose:
222 v9ses->cache = CACHE_LOOSE;
223 break;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500224 case Opt_fscache:
225 v9ses->cache = CACHE_FSCACHE;
226 break;
Dominique Martinetfb89b452014-01-10 13:44:09 +0100227 case Opt_mmap:
228 v9ses->cache = CACHE_MMAP;
229 break;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500230 case Opt_cachetag:
231#ifdef CONFIG_9P_FSCACHE
232 v9ses->cachetag = match_strdup(&args[0]);
233#endif
234 break;
235 case Opt_cache:
236 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600237 if (!s) {
238 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800239 p9_debug(P9_DEBUG_ERROR,
240 "problem allocating copy of cache arg\n");
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600241 goto free_and_return;
242 }
Prem Karata2dd43b2011-05-06 18:24:18 +0530243 ret = get_cache_mode(s);
244 if (ret == -EINVAL) {
245 kfree(s);
246 goto free_and_return;
247 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500248
Prem Karata2dd43b2011-05-06 18:24:18 +0530249 v9ses->cache = ret;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500250 kfree(s);
251 break;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500252
253 case Opt_access:
254 s = match_strdup(&args[0]);
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600255 if (!s) {
256 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800257 p9_debug(P9_DEBUG_ERROR,
258 "problem allocating copy of access arg\n");
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600259 goto free_and_return;
260 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500261
Latchesar Ionkovba176742007-10-17 14:31:07 -0500262 v9ses->flags &= ~V9FS_ACCESS_MASK;
263 if (strcmp(s, "user") == 0)
264 v9ses->flags |= V9FS_ACCESS_USER;
265 else if (strcmp(s, "any") == 0)
266 v9ses->flags |= V9FS_ACCESS_ANY;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530267 else if (strcmp(s, "client") == 0) {
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530268 v9ses->flags |= V9FS_ACCESS_CLIENT;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530269 } else {
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800270 uid_t uid;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500271 v9ses->flags |= V9FS_ACCESS_SINGLE;
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800272 uid = simple_strtoul(s, &e, 10);
Prem Karata2dd43b2011-05-06 18:24:18 +0530273 if (*e != '\0') {
274 ret = -EINVAL;
Joe Perches5d385152011-11-28 10:40:46 -0800275 pr_info("Unknown access argument %s\n",
276 s);
Prem Karata2dd43b2011-05-06 18:24:18 +0530277 kfree(s);
278 goto free_and_return;
279 }
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800280 v9ses->uid = make_kuid(current_user_ns(), uid);
281 if (!uid_valid(v9ses->uid)) {
282 ret = -EINVAL;
283 pr_info("Uknown uid %s\n", s);
284 kfree(s);
285 goto free_and_return;
286 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500287 }
Prem Karata2dd43b2011-05-06 18:24:18 +0530288
Adrian Bunk0a976292007-10-23 13:48:50 -0500289 kfree(s);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500290 break;
291
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800292 case Opt_posixacl:
293#ifdef CONFIG_9P_FS_POSIX_ACL
294 v9ses->flags |= V9FS_POSIX_ACL;
295#else
Joe Perches5d385152011-11-28 10:40:46 -0800296 p9_debug(P9_DEBUG_ERROR,
297 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800298#endif
299 break;
300
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700301 default:
302 continue;
303 }
304 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600305
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600306free_and_return:
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600307 kfree(tmp_options);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500308fail_option_alloc:
Eric Van Hensbergenbf2d29c2010-02-08 17:59:34 -0600309 return ret;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700310}
311
312/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700313 * v9fs_session_init - initialize session
314 * @v9ses: session information structure
315 * @dev_name: device being mounted
316 * @data: options
317 *
318 */
319
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500320struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700321 const char *dev_name, char *data)
322{
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700323 int retval = -EINVAL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500324 struct p9_fid *fid;
Jim Meyeringab312672008-03-06 17:10:28 -0600325 int rc;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700326
Jeff Laytone549c132012-09-07 07:55:25 -0400327 v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500328 if (!v9ses->uname)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500329 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700330
Jeff Laytone549c132012-09-07 07:55:25 -0400331 v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500332 if (!v9ses->aname) {
Jeff Laytone549c132012-09-07 07:55:25 -0400333 kfree(v9ses->uname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500334 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700335 }
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +0530336 init_rwsem(&v9ses->rename_sem);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700337
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200338 rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
339 if (rc) {
Jeff Laytone549c132012-09-07 07:55:25 -0400340 kfree(v9ses->aname);
341 kfree(v9ses->uname);
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200342 return ERR_PTR(rc);
343 }
344
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500345 spin_lock(&v9fs_sessionlist_lock);
346 list_add(&v9ses->slist, &v9fs_sessionlist);
347 spin_unlock(&v9fs_sessionlist_lock);
348
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800349 v9ses->uid = INVALID_UID;
Latchesar Ionkovbd32b822007-10-17 14:31:07 -0500350 v9ses->dfltuid = V9FS_DEFUID;
351 v9ses->dfltgid = V9FS_DEFGID;
Jim Meyeringab312672008-03-06 17:10:28 -0600352
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500353 v9ses->clnt = p9_client_create(dev_name, data);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500354 if (IS_ERR(v9ses->clnt)) {
355 retval = PTR_ERR(v9ses->clnt);
356 v9ses->clnt = NULL;
Joe Perches5d385152011-11-28 10:40:46 -0800357 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500358 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700359 }
360
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800361 v9ses->flags = V9FS_ACCESS_USER;
362
363 if (p9_is_proto_dotl(v9ses->clnt)) {
364 v9ses->flags = V9FS_ACCESS_CLIENT;
Sripathi Kodi476ada02010-03-17 17:02:38 +0000365 v9ses->flags |= V9FS_PROTO_2000L;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800366 } else if (p9_is_proto_dotu(v9ses->clnt)) {
Sripathi Kodi476ada02010-03-17 17:02:38 +0000367 v9ses->flags |= V9FS_PROTO_2000U;
Venkateswararao Jujjuri (JV)6752a1e2011-01-26 16:20:35 -0800368 }
369
370 rc = v9fs_parse_options(v9ses, data);
371 if (rc < 0) {
372 retval = rc;
373 goto error;
374 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500375
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500376 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600377
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530378 if (!v9fs_proto_dotl(v9ses) &&
379 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
380 /*
381 * We support ACCESS_CLIENT only for dotl.
382 * Fall back to ACCESS_USER
383 */
384 v9ses->flags &= ~V9FS_ACCESS_MASK;
385 v9ses->flags |= V9FS_ACCESS_USER;
386 }
387 /*FIXME !! */
Latchesar Ionkovba176742007-10-17 14:31:07 -0500388 /* for legacy mode, fall back to V9FS_ACCESS_ANY */
Aneesh Kumar K.V9ffaf632010-06-01 09:26:18 +0000389 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
Latchesar Ionkovba176742007-10-17 14:31:07 -0500390 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
391
392 v9ses->flags &= ~V9FS_ACCESS_MASK;
393 v9ses->flags |= V9FS_ACCESS_ANY;
Eric W. Biederman76ed23a2013-01-30 11:57:40 -0800394 v9ses->uid = INVALID_UID;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500395 }
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800396 if (!v9fs_proto_dotl(v9ses) ||
397 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
398 /*
399 * We support ACL checks on clinet only if the protocol is
400 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
401 */
402 v9ses->flags &= ~V9FS_ACL_MASK;
403 }
Latchesar Ionkovba176742007-10-17 14:31:07 -0500404
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -0800405 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
Latchesar Ionkovba176742007-10-17 14:31:07 -0500406 v9ses->aname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500407 if (IS_ERR(fid)) {
408 retval = PTR_ERR(fid);
409 fid = NULL;
Joe Perches5d385152011-11-28 10:40:46 -0800410 p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500411 goto error;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700412 }
413
Latchesar Ionkovba176742007-10-17 14:31:07 -0500414 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
415 fid->uid = v9ses->uid;
416 else
Eric W. Biedermanb4642552013-01-30 11:48:53 -0800417 fid->uid = INVALID_UID;
Latchesar Ionkovba176742007-10-17 14:31:07 -0500418
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500419#ifdef CONFIG_9P_FSCACHE
420 /* register the session for caching */
421 v9fs_cache_session_get_cookie(v9ses);
422#endif
423
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500424 return fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700425
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500426error:
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200427 bdi_destroy(&v9ses->bdi);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500428 return ERR_PTR(retval);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700429}
430
431/**
432 * v9fs_session_close - shutdown a session
433 * @v9ses: session information structure
434 *
435 */
436
437void v9fs_session_close(struct v9fs_session_info *v9ses)
438{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500439 if (v9ses->clnt) {
440 p9_client_destroy(v9ses->clnt);
441 v9ses->clnt = NULL;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800442 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700443
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500444#ifdef CONFIG_9P_FSCACHE
445 if (v9ses->fscache) {
446 v9fs_cache_session_put_cookie(v9ses);
447 kfree(v9ses->cachetag);
448 }
449#endif
Jeff Laytone549c132012-09-07 07:55:25 -0400450 kfree(v9ses->uname);
451 kfree(v9ses->aname);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500452
Jens Axboe0ed07dd2010-04-22 11:42:00 +0200453 bdi_destroy(&v9ses->bdi);
454
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500455 spin_lock(&v9fs_sessionlist_lock);
456 list_del(&v9ses->slist);
457 spin_unlock(&v9fs_sessionlist_lock);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700458}
459
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700460/**
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600461 * v9fs_session_cancel - terminate a session
462 * @v9ses: session to terminate
463 *
464 * mark transport as disconnected and cancel all pending requests.
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700465 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600466
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700467void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
Joe Perches5d385152011-11-28 10:40:46 -0800468 p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500469 p9_client_disconnect(v9ses->clnt);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700470}
471
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500472/**
473 * v9fs_session_begin_cancel - Begin terminate of a session
474 * @v9ses: session to terminate
475 *
476 * After this call we don't allow any request other than clunk.
477 */
478
479void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
480{
Joe Perches5d385152011-11-28 10:40:46 -0800481 p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500482 p9_client_begin_disconnect(v9ses->clnt);
483}
484
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700485extern int v9fs_error_init(void);
486
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500487static struct kobject *v9fs_kobj;
488
489#ifdef CONFIG_9P_FSCACHE
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700490/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500491 * caches_show - list caches associated with a session
492 *
493 * Returns the size of buffer written.
494 */
495
496static ssize_t caches_show(struct kobject *kobj,
497 struct kobj_attribute *attr,
498 char *buf)
499{
500 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
501 struct v9fs_session_info *v9ses;
502
503 spin_lock(&v9fs_sessionlist_lock);
504 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
505 if (v9ses->cachetag) {
506 n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
507 if (n < 0) {
508 count = n;
509 break;
510 }
511
512 count += n;
513 limit -= n;
514 }
515 }
516
517 spin_unlock(&v9fs_sessionlist_lock);
518 return count;
519}
520
521static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
522#endif /* CONFIG_9P_FSCACHE */
523
524static struct attribute *v9fs_attrs[] = {
525#ifdef CONFIG_9P_FSCACHE
526 &v9fs_attr_cache.attr,
527#endif
528 NULL,
529};
530
531static struct attribute_group v9fs_attr_group = {
532 .attrs = v9fs_attrs,
533};
534
535/**
536 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
537 *
538 */
539
540static int v9fs_sysfs_init(void)
541{
542 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
543 if (!v9fs_kobj)
544 return -ENOMEM;
545
546 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
547 kobject_put(v9fs_kobj);
548 return -ENOMEM;
549 }
550
551 return 0;
552}
553
554/**
555 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
556 *
557 */
558
559static void v9fs_sysfs_cleanup(void)
560{
561 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
562 kobject_put(v9fs_kobj);
563}
564
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530565static void v9fs_inode_init_once(void *foo)
566{
567 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
568#ifdef CONFIG_9P_FSCACHE
569 v9inode->fscache = NULL;
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530570#endif
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000571 memset(&v9inode->qid, 0, sizeof(v9inode->qid));
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530572 inode_init_once(&v9inode->vfs_inode);
573}
574
575/**
576 * v9fs_init_inode_cache - initialize a cache for 9P
577 * Returns 0 on success.
578 */
579static int v9fs_init_inode_cache(void)
580{
581 v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
582 sizeof(struct v9fs_inode),
583 0, (SLAB_RECLAIM_ACCOUNT|
584 SLAB_MEM_SPREAD),
585 v9fs_inode_init_once);
586 if (!v9fs_inode_cache)
587 return -ENOMEM;
588
589 return 0;
590}
591
592/**
593 * v9fs_destroy_inode_cache - destroy the cache of 9P inode
594 *
595 */
596static void v9fs_destroy_inode_cache(void)
597{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000598 /*
599 * Make sure all delayed rcu free inodes are flushed before we
600 * destroy cache.
601 */
602 rcu_barrier();
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530603 kmem_cache_destroy(v9fs_inode_cache);
604}
605
606static int v9fs_cache_register(void)
607{
608 int ret;
609 ret = v9fs_init_inode_cache();
610 if (ret < 0)
611 return ret;
612#ifdef CONFIG_9P_FSCACHE
Al Viro8061a6f2013-09-17 08:10:18 -0400613 ret = fscache_register_netfs(&v9fs_cache_netfs);
614 if (ret < 0)
615 v9fs_destroy_inode_cache();
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530616#endif
Al Viro8061a6f2013-09-17 08:10:18 -0400617 return ret;
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530618}
619
620static void v9fs_cache_unregister(void)
621{
622 v9fs_destroy_inode_cache();
623#ifdef CONFIG_9P_FSCACHE
624 fscache_unregister_netfs(&v9fs_cache_netfs);
625#endif
626}
627
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500628/**
629 * init_v9fs - Initialize module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700630 *
631 */
632
633static int __init init_v9fs(void)
634{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500635 int err;
Joe Perches5d385152011-11-28 10:40:46 -0800636 pr_info("Installing v9fs 9p2000 file system support\n");
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500637 /* TODO: Setup list of registered trasnport modules */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500638
639 err = v9fs_cache_register();
640 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800641 pr_err("Failed to register v9fs for caching\n");
Al Viro2226a282012-03-17 02:37:05 -0400642 return err;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500643 }
644
645 err = v9fs_sysfs_init();
646 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800647 pr_err("Failed to register with sysfs\n");
Al Viro2226a282012-03-17 02:37:05 -0400648 goto out_cache;
649 }
650 err = register_filesystem(&v9fs_fs_type);
651 if (err < 0) {
652 pr_err("Failed to register filesystem\n");
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500653 goto out_sysfs_cleanup;
654 }
655
656 return 0;
657
658out_sysfs_cleanup:
659 v9fs_sysfs_cleanup();
660
Al Viro2226a282012-03-17 02:37:05 -0400661out_cache:
662 v9fs_cache_unregister();
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500663
664 return err;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700665}
666
667/**
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500668 * exit_v9fs - shutdown module
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700669 *
670 */
671
672static void __exit exit_v9fs(void)
673{
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500674 v9fs_sysfs_cleanup();
675 v9fs_cache_unregister();
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700676 unregister_filesystem(&v9fs_fs_type);
677}
678
679module_init(init_v9fs)
680module_exit(exit_v9fs)
681
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500682MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700683MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
684MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
685MODULE_LICENSE("GPL");