Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/v9fs.c |
| 3 | * |
| 4 | * This file contains functions assisting in mapping VFS to 9P2000 |
| 5 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 6 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 7 | * 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 Hensbergen | 42e8c50 | 2006-03-25 03:07:28 -0800 | [diff] [blame] | 10 | * it under the terms of the GNU General Public License version 2 |
| 11 | * as published by the Free Software Foundation. |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 12 | * |
| 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 Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 26 | #include <linux/module.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/fs.h> |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 29 | #include <linux/sched.h> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 30 | #include <linux/parser.h> |
| 31 | #include <linux/idr.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 32 | #include <net/9p/9p.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 33 | #include <net/9p/client.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 34 | #include <net/9p/transport.h> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 35 | #include "v9fs.h" |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 36 | #include "v9fs_vfs.h" |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 37 | #include "cache.h" |
| 38 | |
| 39 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); |
| 40 | static LIST_HEAD(v9fs_sessionlist); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 41 | |
| 42 | /* |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 43 | * Option Parsing (code inspired by NFS code) |
| 44 | * NOTE: each transport will parse its own options |
| 45 | */ |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 46 | |
| 47 | enum { |
| 48 | /* Options that take integer arguments */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 49 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 50 | /* String options */ |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 51 | Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 52 | /* Options that take no arguments */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 53 | Opt_nodevmap, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 54 | /* Cache options */ |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 55 | Opt_cache_loose, Opt_fscache, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 56 | /* Access options */ |
| 57 | Opt_access, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 58 | /* Error token */ |
| 59 | Opt_err |
| 60 | }; |
| 61 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 62 | static const match_table_t tokens = { |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 63 | {Opt_debug, "debug=%x"}, |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 64 | {Opt_dfltuid, "dfltuid=%u"}, |
| 65 | {Opt_dfltgid, "dfltgid=%u"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 66 | {Opt_afid, "afid=%u"}, |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 67 | {Opt_uname, "uname=%s"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 68 | {Opt_remotename, "aname=%s"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 69 | {Opt_nodevmap, "nodevmap"}, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 70 | {Opt_cache, "cache=%s"}, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 71 | {Opt_cache_loose, "loose"}, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 72 | {Opt_fscache, "fscache"}, |
| 73 | {Opt_cachetag, "cachetag=%s"}, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 74 | {Opt_access, "access=%s"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 75 | {Opt_err, NULL} |
| 76 | }; |
| 77 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 78 | /** |
| 79 | * v9fs_parse_options - parse mount options into session structure |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 80 | * @v9ses: existing v9fs session information |
| 81 | * |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 82 | * Return 0 upon success, -ERRNO upon failure. |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 83 | */ |
| 84 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 85 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 86 | { |
Latchesar Ionkov | 8999e04 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 87 | char *options; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 88 | substring_t args[MAX_OPT_ARGS]; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 89 | char *p; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 90 | int option = 0; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 91 | char *s, *e; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 92 | int ret = 0; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 93 | |
| 94 | /* setup defaults */ |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 95 | v9ses->afid = ~0; |
| 96 | v9ses->debug = 0; |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 97 | v9ses->cache = 0; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 98 | #ifdef CONFIG_9P_FSCACHE |
| 99 | v9ses->cachetag = NULL; |
| 100 | #endif |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 101 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 102 | if (!opts) |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 103 | return 0; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 104 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 105 | options = kstrdup(opts, GFP_KERNEL); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 106 | if (!options) |
| 107 | goto fail_option_alloc; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 108 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 109 | while ((p = strsep(&options, ",")) != NULL) { |
| 110 | int token; |
| 111 | if (!*p) |
| 112 | continue; |
| 113 | token = match_token(p, tokens, args); |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 114 | if (token < Opt_uname) { |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 115 | int r = match_int(&args[0], &option); |
| 116 | if (r < 0) { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 117 | P9_DPRINTK(P9_DEBUG_ERROR, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 118 | "integer field, but no integer?\n"); |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 119 | ret = r; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 120 | continue; |
| 121 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 122 | } |
| 123 | switch (token) { |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 124 | case Opt_debug: |
| 125 | v9ses->debug = option; |
Eric Van Hensbergen | 10fa16e | 2007-07-16 16:02:49 -0500 | [diff] [blame] | 126 | #ifdef CONFIG_NET_9P_DEBUG |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 127 | p9_debug_level = option; |
Eric Van Hensbergen | 10fa16e | 2007-07-16 16:02:49 -0500 | [diff] [blame] | 128 | #endif |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 129 | break; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 130 | |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 131 | case Opt_dfltuid: |
| 132 | v9ses->dfltuid = option; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 133 | break; |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 134 | case Opt_dfltgid: |
| 135 | v9ses->dfltgid = option; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 136 | break; |
| 137 | case Opt_afid: |
| 138 | v9ses->afid = option; |
| 139 | break; |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 140 | case Opt_uname: |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 141 | match_strlcpy(v9ses->uname, &args[0], PATH_MAX); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 142 | break; |
| 143 | case Opt_remotename: |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 144 | match_strlcpy(v9ses->aname, &args[0], PATH_MAX); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 145 | break; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 146 | case Opt_nodevmap: |
| 147 | v9ses->nodev = 1; |
| 148 | break; |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 149 | case Opt_cache_loose: |
| 150 | v9ses->cache = CACHE_LOOSE; |
| 151 | break; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 152 | case Opt_fscache: |
| 153 | v9ses->cache = CACHE_FSCACHE; |
| 154 | break; |
| 155 | case Opt_cachetag: |
| 156 | #ifdef CONFIG_9P_FSCACHE |
| 157 | v9ses->cachetag = match_strdup(&args[0]); |
| 158 | #endif |
| 159 | break; |
| 160 | case Opt_cache: |
| 161 | s = match_strdup(&args[0]); |
| 162 | if (!s) |
| 163 | goto fail_option_alloc; |
| 164 | |
| 165 | if (strcmp(s, "loose") == 0) |
| 166 | v9ses->cache = CACHE_LOOSE; |
| 167 | else if (strcmp(s, "fscache") == 0) |
| 168 | v9ses->cache = CACHE_FSCACHE; |
| 169 | else |
| 170 | v9ses->cache = CACHE_NONE; |
| 171 | kfree(s); |
| 172 | break; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 173 | |
| 174 | case Opt_access: |
| 175 | s = match_strdup(&args[0]); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 176 | if (!s) |
| 177 | goto fail_option_alloc; |
| 178 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 179 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 180 | if (strcmp(s, "user") == 0) |
| 181 | v9ses->flags |= V9FS_ACCESS_USER; |
| 182 | else if (strcmp(s, "any") == 0) |
| 183 | v9ses->flags |= V9FS_ACCESS_ANY; |
| 184 | else { |
| 185 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
Julia Lawall | f1d9e45 | 2008-12-19 16:50:22 -0600 | [diff] [blame] | 186 | v9ses->uid = simple_strtoul(s, &e, 10); |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 187 | if (*e != '\0') |
| 188 | v9ses->uid = ~0; |
| 189 | } |
Adrian Bunk | 0a97629 | 2007-10-23 13:48:50 -0500 | [diff] [blame] | 190 | kfree(s); |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 191 | break; |
| 192 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 193 | default: |
| 194 | continue; |
| 195 | } |
| 196 | } |
Latchesar Ionkov | 8999e04 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 197 | kfree(options); |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 198 | return ret; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 199 | |
| 200 | fail_option_alloc: |
| 201 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 202 | "failed to allocate copy of option argument\n"); |
| 203 | return -ENOMEM; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | /** |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 207 | * v9fs_session_init - initialize session |
| 208 | * @v9ses: session information structure |
| 209 | * @dev_name: device being mounted |
| 210 | * @data: options |
| 211 | * |
| 212 | */ |
| 213 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 214 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 215 | const char *dev_name, char *data) |
| 216 | { |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 217 | int retval = -EINVAL; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 218 | struct p9_fid *fid; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 219 | int rc; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 220 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 221 | v9ses->uname = __getname(); |
| 222 | if (!v9ses->uname) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 223 | return ERR_PTR(-ENOMEM); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 224 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 225 | v9ses->aname = __getname(); |
| 226 | if (!v9ses->aname) { |
| 227 | __putname(v9ses->uname); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 228 | return ERR_PTR(-ENOMEM); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 231 | spin_lock(&v9fs_sessionlist_lock); |
| 232 | list_add(&v9ses->slist, &v9fs_sessionlist); |
| 233 | spin_unlock(&v9fs_sessionlist_lock); |
| 234 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 235 | v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER; |
| 236 | strcpy(v9ses->uname, V9FS_DEFUSER); |
| 237 | strcpy(v9ses->aname, V9FS_DEFANAME); |
| 238 | v9ses->uid = ~0; |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 239 | v9ses->dfltuid = V9FS_DEFUID; |
| 240 | v9ses->dfltgid = V9FS_DEFGID; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 241 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 242 | rc = v9fs_parse_options(v9ses, data); |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 243 | if (rc < 0) { |
| 244 | retval = rc; |
| 245 | goto error; |
| 246 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 247 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 248 | v9ses->clnt = p9_client_create(dev_name, data); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 249 | if (IS_ERR(v9ses->clnt)) { |
| 250 | retval = PTR_ERR(v9ses->clnt); |
| 251 | v9ses->clnt = NULL; |
| 252 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
| 253 | goto error; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 256 | if (!v9ses->clnt->dotu) |
| 257 | v9ses->flags &= ~V9FS_EXTENDED; |
| 258 | |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 259 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 260 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 261 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
| 262 | if (!v9fs_extended(v9ses) && |
| 263 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
| 264 | |
| 265 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 266 | v9ses->flags |= V9FS_ACCESS_ANY; |
| 267 | v9ses->uid = ~0; |
| 268 | } |
| 269 | |
| 270 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, |
| 271 | v9ses->aname); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 272 | if (IS_ERR(fid)) { |
| 273 | retval = PTR_ERR(fid); |
| 274 | fid = NULL; |
| 275 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); |
| 276 | goto error; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 279 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
| 280 | fid->uid = v9ses->uid; |
| 281 | else |
| 282 | fid->uid = ~0; |
| 283 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 284 | #ifdef CONFIG_9P_FSCACHE |
| 285 | /* register the session for caching */ |
| 286 | v9fs_cache_session_get_cookie(v9ses); |
| 287 | #endif |
| 288 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 289 | return fid; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 290 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 291 | error: |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 292 | return ERR_PTR(retval); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | /** |
| 296 | * v9fs_session_close - shutdown a session |
| 297 | * @v9ses: session information structure |
| 298 | * |
| 299 | */ |
| 300 | |
| 301 | void v9fs_session_close(struct v9fs_session_info *v9ses) |
| 302 | { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 303 | if (v9ses->clnt) { |
| 304 | p9_client_destroy(v9ses->clnt); |
| 305 | v9ses->clnt = NULL; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 306 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 307 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 308 | #ifdef CONFIG_9P_FSCACHE |
| 309 | if (v9ses->fscache) { |
| 310 | v9fs_cache_session_put_cookie(v9ses); |
| 311 | kfree(v9ses->cachetag); |
| 312 | } |
| 313 | #endif |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 314 | __putname(v9ses->uname); |
| 315 | __putname(v9ses->aname); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 316 | |
| 317 | spin_lock(&v9fs_sessionlist_lock); |
| 318 | list_del(&v9ses->slist); |
| 319 | spin_unlock(&v9fs_sessionlist_lock); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 320 | } |
| 321 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 322 | /** |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 323 | * v9fs_session_cancel - terminate a session |
| 324 | * @v9ses: session to terminate |
| 325 | * |
| 326 | * mark transport as disconnected and cancel all pending requests. |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 327 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 328 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 329 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 330 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
| 331 | p9_client_disconnect(v9ses->clnt); |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 332 | } |
| 333 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 334 | extern int v9fs_error_init(void); |
| 335 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 336 | static struct kobject *v9fs_kobj; |
| 337 | |
| 338 | #ifdef CONFIG_9P_FSCACHE |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 339 | /** |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 340 | * caches_show - list caches associated with a session |
| 341 | * |
| 342 | * Returns the size of buffer written. |
| 343 | */ |
| 344 | |
| 345 | static ssize_t caches_show(struct kobject *kobj, |
| 346 | struct kobj_attribute *attr, |
| 347 | char *buf) |
| 348 | { |
| 349 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; |
| 350 | struct v9fs_session_info *v9ses; |
| 351 | |
| 352 | spin_lock(&v9fs_sessionlist_lock); |
| 353 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { |
| 354 | if (v9ses->cachetag) { |
| 355 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); |
| 356 | if (n < 0) { |
| 357 | count = n; |
| 358 | break; |
| 359 | } |
| 360 | |
| 361 | count += n; |
| 362 | limit -= n; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | spin_unlock(&v9fs_sessionlist_lock); |
| 367 | return count; |
| 368 | } |
| 369 | |
| 370 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); |
| 371 | #endif /* CONFIG_9P_FSCACHE */ |
| 372 | |
| 373 | static struct attribute *v9fs_attrs[] = { |
| 374 | #ifdef CONFIG_9P_FSCACHE |
| 375 | &v9fs_attr_cache.attr, |
| 376 | #endif |
| 377 | NULL, |
| 378 | }; |
| 379 | |
| 380 | static struct attribute_group v9fs_attr_group = { |
| 381 | .attrs = v9fs_attrs, |
| 382 | }; |
| 383 | |
| 384 | /** |
| 385 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface |
| 386 | * |
| 387 | */ |
| 388 | |
| 389 | static int v9fs_sysfs_init(void) |
| 390 | { |
| 391 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); |
| 392 | if (!v9fs_kobj) |
| 393 | return -ENOMEM; |
| 394 | |
| 395 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { |
| 396 | kobject_put(v9fs_kobj); |
| 397 | return -ENOMEM; |
| 398 | } |
| 399 | |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface |
| 405 | * |
| 406 | */ |
| 407 | |
| 408 | static void v9fs_sysfs_cleanup(void) |
| 409 | { |
| 410 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); |
| 411 | kobject_put(v9fs_kobj); |
| 412 | } |
| 413 | |
| 414 | /** |
| 415 | * init_v9fs - Initialize module |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 416 | * |
| 417 | */ |
| 418 | |
| 419 | static int __init init_v9fs(void) |
| 420 | { |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 421 | int err; |
Eric Van Hensbergen | f94b347 | 2007-01-26 00:57:04 -0800 | [diff] [blame] | 422 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 423 | /* TODO: Setup list of registered trasnport modules */ |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 424 | err = register_filesystem(&v9fs_fs_type); |
| 425 | if (err < 0) { |
| 426 | printk(KERN_ERR "Failed to register filesystem\n"); |
| 427 | return err; |
| 428 | } |
| 429 | |
| 430 | err = v9fs_cache_register(); |
| 431 | if (err < 0) { |
| 432 | printk(KERN_ERR "Failed to register v9fs for caching\n"); |
| 433 | goto out_fs_unreg; |
| 434 | } |
| 435 | |
| 436 | err = v9fs_sysfs_init(); |
| 437 | if (err < 0) { |
| 438 | printk(KERN_ERR "Failed to register with sysfs\n"); |
| 439 | goto out_sysfs_cleanup; |
| 440 | } |
| 441 | |
| 442 | return 0; |
| 443 | |
| 444 | out_sysfs_cleanup: |
| 445 | v9fs_sysfs_cleanup(); |
| 446 | |
| 447 | out_fs_unreg: |
| 448 | unregister_filesystem(&v9fs_fs_type); |
| 449 | |
| 450 | return err; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | /** |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 454 | * exit_v9fs - shutdown module |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 455 | * |
| 456 | */ |
| 457 | |
| 458 | static void __exit exit_v9fs(void) |
| 459 | { |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 460 | v9fs_sysfs_cleanup(); |
| 461 | v9fs_cache_unregister(); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 462 | unregister_filesystem(&v9fs_fs_type); |
| 463 | } |
| 464 | |
| 465 | module_init(init_v9fs) |
| 466 | module_exit(exit_v9fs) |
| 467 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 468 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 469 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
| 470 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); |
| 471 | MODULE_LICENSE("GPL"); |