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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 33 | #include <net/9p/9p.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 34 | #include <net/9p/client.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 35 | #include <net/9p/transport.h> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 36 | #include "v9fs.h" |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 37 | #include "v9fs_vfs.h" |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 38 | #include "cache.h" |
| 39 | |
| 40 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); |
| 41 | static LIST_HEAD(v9fs_sessionlist); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 42 | |
| 43 | /* |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 44 | * Option Parsing (code inspired by NFS code) |
| 45 | * NOTE: each transport will parse its own options |
| 46 | */ |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 47 | |
| 48 | enum { |
| 49 | /* Options that take integer arguments */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 50 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 51 | /* String options */ |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 52 | Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 53 | /* Options that take no arguments */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 54 | Opt_nodevmap, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 55 | /* Cache options */ |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 56 | Opt_cache_loose, Opt_fscache, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 57 | /* Access options */ |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame^] | 58 | Opt_access, Opt_posixacl, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 59 | /* Error token */ |
| 60 | Opt_err |
| 61 | }; |
| 62 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 63 | static const match_table_t tokens = { |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 64 | {Opt_debug, "debug=%x"}, |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 65 | {Opt_dfltuid, "dfltuid=%u"}, |
| 66 | {Opt_dfltgid, "dfltgid=%u"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 67 | {Opt_afid, "afid=%u"}, |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 68 | {Opt_uname, "uname=%s"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 69 | {Opt_remotename, "aname=%s"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 70 | {Opt_nodevmap, "nodevmap"}, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 71 | {Opt_cache, "cache=%s"}, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 72 | {Opt_cache_loose, "loose"}, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 73 | {Opt_fscache, "fscache"}, |
| 74 | {Opt_cachetag, "cachetag=%s"}, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 75 | {Opt_access, "access=%s"}, |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame^] | 76 | {Opt_posixacl, "posixacl"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 77 | {Opt_err, NULL} |
| 78 | }; |
| 79 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 80 | /** |
| 81 | * v9fs_parse_options - parse mount options into session structure |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 82 | * @v9ses: existing v9fs session information |
| 83 | * |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 84 | * Return 0 upon success, -ERRNO upon failure. |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 85 | */ |
| 86 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 87 | 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] | 88 | { |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 89 | char *options, *tmp_options; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 90 | substring_t args[MAX_OPT_ARGS]; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 91 | char *p; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 92 | int option = 0; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 93 | char *s, *e; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 94 | int ret = 0; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 95 | |
| 96 | /* setup defaults */ |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 97 | v9ses->afid = ~0; |
| 98 | v9ses->debug = 0; |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 99 | v9ses->cache = 0; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 100 | #ifdef CONFIG_9P_FSCACHE |
| 101 | v9ses->cachetag = NULL; |
| 102 | #endif |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 103 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 104 | if (!opts) |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 105 | return 0; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 106 | |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 107 | tmp_options = kstrdup(opts, GFP_KERNEL); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 108 | if (!tmp_options) { |
| 109 | ret = -ENOMEM; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 110 | goto fail_option_alloc; |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 111 | } |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 112 | options = tmp_options; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 113 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 114 | while ((p = strsep(&options, ",")) != NULL) { |
| 115 | int token; |
| 116 | if (!*p) |
| 117 | continue; |
| 118 | token = match_token(p, tokens, args); |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 119 | if (token < Opt_uname) { |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 120 | int r = match_int(&args[0], &option); |
| 121 | if (r < 0) { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 122 | P9_DPRINTK(P9_DEBUG_ERROR, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 123 | "integer field, but no integer?\n"); |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 124 | ret = r; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 125 | continue; |
| 126 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 127 | } |
| 128 | switch (token) { |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 129 | case Opt_debug: |
| 130 | v9ses->debug = option; |
Eric Van Hensbergen | 10fa16e | 2007-07-16 16:02:49 -0500 | [diff] [blame] | 131 | #ifdef CONFIG_NET_9P_DEBUG |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 132 | p9_debug_level = option; |
Eric Van Hensbergen | 10fa16e | 2007-07-16 16:02:49 -0500 | [diff] [blame] | 133 | #endif |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 134 | break; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 135 | |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 136 | case Opt_dfltuid: |
| 137 | v9ses->dfltuid = option; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 138 | break; |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 139 | case Opt_dfltgid: |
| 140 | v9ses->dfltgid = option; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 141 | break; |
| 142 | case Opt_afid: |
| 143 | v9ses->afid = option; |
| 144 | break; |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 145 | case Opt_uname: |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 146 | match_strlcpy(v9ses->uname, &args[0], PATH_MAX); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 147 | break; |
| 148 | case Opt_remotename: |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 149 | match_strlcpy(v9ses->aname, &args[0], PATH_MAX); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 150 | break; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 151 | case Opt_nodevmap: |
| 152 | v9ses->nodev = 1; |
| 153 | break; |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 154 | case Opt_cache_loose: |
| 155 | v9ses->cache = CACHE_LOOSE; |
| 156 | break; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 157 | case Opt_fscache: |
| 158 | v9ses->cache = CACHE_FSCACHE; |
| 159 | break; |
| 160 | case Opt_cachetag: |
| 161 | #ifdef CONFIG_9P_FSCACHE |
| 162 | v9ses->cachetag = match_strdup(&args[0]); |
| 163 | #endif |
| 164 | break; |
| 165 | case Opt_cache: |
| 166 | s = match_strdup(&args[0]); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 167 | if (!s) { |
| 168 | ret = -ENOMEM; |
| 169 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 170 | "problem allocating copy of cache arg\n"); |
| 171 | goto free_and_return; |
| 172 | } |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 173 | |
| 174 | if (strcmp(s, "loose") == 0) |
| 175 | v9ses->cache = CACHE_LOOSE; |
| 176 | else if (strcmp(s, "fscache") == 0) |
| 177 | v9ses->cache = CACHE_FSCACHE; |
| 178 | else |
| 179 | v9ses->cache = CACHE_NONE; |
| 180 | kfree(s); |
| 181 | break; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 182 | |
| 183 | case Opt_access: |
| 184 | s = match_strdup(&args[0]); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 185 | if (!s) { |
| 186 | ret = -ENOMEM; |
| 187 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 188 | "problem allocating copy of access arg\n"); |
| 189 | goto free_and_return; |
| 190 | } |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 191 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 192 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 193 | if (strcmp(s, "user") == 0) |
| 194 | v9ses->flags |= V9FS_ACCESS_USER; |
| 195 | else if (strcmp(s, "any") == 0) |
| 196 | v9ses->flags |= V9FS_ACCESS_ANY; |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 197 | else if (strcmp(s, "client") == 0) { |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 198 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 199 | } else { |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 200 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
Julia Lawall | f1d9e45 | 2008-12-19 16:50:22 -0600 | [diff] [blame] | 201 | v9ses->uid = simple_strtoul(s, &e, 10); |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 202 | if (*e != '\0') |
| 203 | v9ses->uid = ~0; |
| 204 | } |
Adrian Bunk | 0a97629 | 2007-10-23 13:48:50 -0500 | [diff] [blame] | 205 | kfree(s); |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 206 | break; |
| 207 | |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame^] | 208 | case Opt_posixacl: |
| 209 | #ifdef CONFIG_9P_FS_POSIX_ACL |
| 210 | v9ses->flags |= V9FS_POSIX_ACL; |
| 211 | #else |
| 212 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 213 | "Not defined CONFIG_9P_FS_POSIX_ACL. " |
| 214 | "Ignoring posixacl option\n"); |
| 215 | #endif |
| 216 | break; |
| 217 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 218 | default: |
| 219 | continue; |
| 220 | } |
| 221 | } |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 222 | |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 223 | free_and_return: |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 224 | kfree(tmp_options); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 225 | fail_option_alloc: |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 226 | return ret; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | /** |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 230 | * v9fs_session_init - initialize session |
| 231 | * @v9ses: session information structure |
| 232 | * @dev_name: device being mounted |
| 233 | * @data: options |
| 234 | * |
| 235 | */ |
| 236 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 237 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 238 | const char *dev_name, char *data) |
| 239 | { |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 240 | int retval = -EINVAL; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 241 | struct p9_fid *fid; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 242 | int rc; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 243 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 244 | v9ses->uname = __getname(); |
| 245 | if (!v9ses->uname) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 246 | return ERR_PTR(-ENOMEM); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 247 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 248 | v9ses->aname = __getname(); |
| 249 | if (!v9ses->aname) { |
| 250 | __putname(v9ses->uname); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 251 | return ERR_PTR(-ENOMEM); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 252 | } |
Aneesh Kumar K.V | a534c8d | 2010-06-30 19:18:50 +0530 | [diff] [blame] | 253 | init_rwsem(&v9ses->rename_sem); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 254 | |
Jens Axboe | 0ed07dd | 2010-04-22 11:42:00 +0200 | [diff] [blame] | 255 | rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); |
| 256 | if (rc) { |
| 257 | __putname(v9ses->aname); |
| 258 | __putname(v9ses->uname); |
| 259 | return ERR_PTR(rc); |
| 260 | } |
| 261 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 262 | spin_lock(&v9fs_sessionlist_lock); |
| 263 | list_add(&v9ses->slist, &v9fs_sessionlist); |
| 264 | spin_unlock(&v9fs_sessionlist_lock); |
| 265 | |
Sripathi Kodi | 476ada0 | 2010-03-17 17:02:38 +0000 | [diff] [blame] | 266 | v9ses->flags = V9FS_ACCESS_USER; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 267 | strcpy(v9ses->uname, V9FS_DEFUSER); |
| 268 | strcpy(v9ses->aname, V9FS_DEFANAME); |
| 269 | v9ses->uid = ~0; |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 270 | v9ses->dfltuid = V9FS_DEFUID; |
| 271 | v9ses->dfltgid = V9FS_DEFGID; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 272 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 273 | rc = v9fs_parse_options(v9ses, data); |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 274 | if (rc < 0) { |
| 275 | retval = rc; |
| 276 | goto error; |
| 277 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 278 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 279 | v9ses->clnt = p9_client_create(dev_name, data); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 280 | if (IS_ERR(v9ses->clnt)) { |
| 281 | retval = PTR_ERR(v9ses->clnt); |
| 282 | v9ses->clnt = NULL; |
| 283 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
| 284 | goto error; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 285 | } |
| 286 | |
Sripathi Kodi | 476ada0 | 2010-03-17 17:02:38 +0000 | [diff] [blame] | 287 | if (p9_is_proto_dotl(v9ses->clnt)) |
| 288 | v9ses->flags |= V9FS_PROTO_2000L; |
| 289 | else if (p9_is_proto_dotu(v9ses->clnt)) |
| 290 | v9ses->flags |= V9FS_PROTO_2000U; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 291 | |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 292 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 293 | |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 294 | if (!v9fs_proto_dotl(v9ses) && |
| 295 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
| 296 | /* |
| 297 | * We support ACCESS_CLIENT only for dotl. |
| 298 | * Fall back to ACCESS_USER |
| 299 | */ |
| 300 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 301 | v9ses->flags |= V9FS_ACCESS_USER; |
| 302 | } |
| 303 | /*FIXME !! */ |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 304 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
Aneesh Kumar K.V | 9ffaf63 | 2010-06-01 09:26:18 +0000 | [diff] [blame] | 305 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 306 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
| 307 | |
| 308 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 309 | v9ses->flags |= V9FS_ACCESS_ANY; |
| 310 | v9ses->uid = ~0; |
| 311 | } |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame^] | 312 | if (!v9fs_proto_dotl(v9ses) || |
| 313 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
| 314 | /* |
| 315 | * We support ACL checks on clinet only if the protocol is |
| 316 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. |
| 317 | */ |
| 318 | v9ses->flags &= ~V9FS_ACL_MASK; |
| 319 | } |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 320 | |
| 321 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, |
| 322 | v9ses->aname); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 323 | if (IS_ERR(fid)) { |
| 324 | retval = PTR_ERR(fid); |
| 325 | fid = NULL; |
| 326 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); |
| 327 | goto error; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 328 | } |
| 329 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 330 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
| 331 | fid->uid = v9ses->uid; |
| 332 | else |
| 333 | fid->uid = ~0; |
| 334 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 335 | #ifdef CONFIG_9P_FSCACHE |
| 336 | /* register the session for caching */ |
| 337 | v9fs_cache_session_get_cookie(v9ses); |
| 338 | #endif |
| 339 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 340 | return fid; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 341 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 342 | error: |
Jens Axboe | 0ed07dd | 2010-04-22 11:42:00 +0200 | [diff] [blame] | 343 | bdi_destroy(&v9ses->bdi); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 344 | return ERR_PTR(retval); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /** |
| 348 | * v9fs_session_close - shutdown a session |
| 349 | * @v9ses: session information structure |
| 350 | * |
| 351 | */ |
| 352 | |
| 353 | void v9fs_session_close(struct v9fs_session_info *v9ses) |
| 354 | { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 355 | if (v9ses->clnt) { |
| 356 | p9_client_destroy(v9ses->clnt); |
| 357 | v9ses->clnt = NULL; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 358 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 359 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 360 | #ifdef CONFIG_9P_FSCACHE |
| 361 | if (v9ses->fscache) { |
| 362 | v9fs_cache_session_put_cookie(v9ses); |
| 363 | kfree(v9ses->cachetag); |
| 364 | } |
| 365 | #endif |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 366 | __putname(v9ses->uname); |
| 367 | __putname(v9ses->aname); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 368 | |
Jens Axboe | 0ed07dd | 2010-04-22 11:42:00 +0200 | [diff] [blame] | 369 | bdi_destroy(&v9ses->bdi); |
| 370 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 371 | spin_lock(&v9fs_sessionlist_lock); |
| 372 | list_del(&v9ses->slist); |
| 373 | spin_unlock(&v9fs_sessionlist_lock); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 376 | /** |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 377 | * v9fs_session_cancel - terminate a session |
| 378 | * @v9ses: session to terminate |
| 379 | * |
| 380 | * mark transport as disconnected and cancel all pending requests. |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 381 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 382 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 383 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 384 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
| 385 | p9_client_disconnect(v9ses->clnt); |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 386 | } |
| 387 | |
Aneesh Kumar K.V | 6d96d3a | 2010-03-29 18:13:59 -0500 | [diff] [blame] | 388 | /** |
| 389 | * v9fs_session_begin_cancel - Begin terminate of a session |
| 390 | * @v9ses: session to terminate |
| 391 | * |
| 392 | * After this call we don't allow any request other than clunk. |
| 393 | */ |
| 394 | |
| 395 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) |
| 396 | { |
| 397 | P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); |
| 398 | p9_client_begin_disconnect(v9ses->clnt); |
| 399 | } |
| 400 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 401 | extern int v9fs_error_init(void); |
| 402 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 403 | static struct kobject *v9fs_kobj; |
| 404 | |
| 405 | #ifdef CONFIG_9P_FSCACHE |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 406 | /** |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 407 | * caches_show - list caches associated with a session |
| 408 | * |
| 409 | * Returns the size of buffer written. |
| 410 | */ |
| 411 | |
| 412 | static ssize_t caches_show(struct kobject *kobj, |
| 413 | struct kobj_attribute *attr, |
| 414 | char *buf) |
| 415 | { |
| 416 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; |
| 417 | struct v9fs_session_info *v9ses; |
| 418 | |
| 419 | spin_lock(&v9fs_sessionlist_lock); |
| 420 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { |
| 421 | if (v9ses->cachetag) { |
| 422 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); |
| 423 | if (n < 0) { |
| 424 | count = n; |
| 425 | break; |
| 426 | } |
| 427 | |
| 428 | count += n; |
| 429 | limit -= n; |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | spin_unlock(&v9fs_sessionlist_lock); |
| 434 | return count; |
| 435 | } |
| 436 | |
| 437 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); |
| 438 | #endif /* CONFIG_9P_FSCACHE */ |
| 439 | |
| 440 | static struct attribute *v9fs_attrs[] = { |
| 441 | #ifdef CONFIG_9P_FSCACHE |
| 442 | &v9fs_attr_cache.attr, |
| 443 | #endif |
| 444 | NULL, |
| 445 | }; |
| 446 | |
| 447 | static struct attribute_group v9fs_attr_group = { |
| 448 | .attrs = v9fs_attrs, |
| 449 | }; |
| 450 | |
| 451 | /** |
| 452 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface |
| 453 | * |
| 454 | */ |
| 455 | |
| 456 | static int v9fs_sysfs_init(void) |
| 457 | { |
| 458 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); |
| 459 | if (!v9fs_kobj) |
| 460 | return -ENOMEM; |
| 461 | |
| 462 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { |
| 463 | kobject_put(v9fs_kobj); |
| 464 | return -ENOMEM; |
| 465 | } |
| 466 | |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface |
| 472 | * |
| 473 | */ |
| 474 | |
| 475 | static void v9fs_sysfs_cleanup(void) |
| 476 | { |
| 477 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); |
| 478 | kobject_put(v9fs_kobj); |
| 479 | } |
| 480 | |
| 481 | /** |
| 482 | * init_v9fs - Initialize module |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 483 | * |
| 484 | */ |
| 485 | |
| 486 | static int __init init_v9fs(void) |
| 487 | { |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 488 | int err; |
Eric Van Hensbergen | f94b347 | 2007-01-26 00:57:04 -0800 | [diff] [blame] | 489 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 490 | /* TODO: Setup list of registered trasnport modules */ |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 491 | err = register_filesystem(&v9fs_fs_type); |
| 492 | if (err < 0) { |
| 493 | printk(KERN_ERR "Failed to register filesystem\n"); |
| 494 | return err; |
| 495 | } |
| 496 | |
| 497 | err = v9fs_cache_register(); |
| 498 | if (err < 0) { |
| 499 | printk(KERN_ERR "Failed to register v9fs for caching\n"); |
| 500 | goto out_fs_unreg; |
| 501 | } |
| 502 | |
| 503 | err = v9fs_sysfs_init(); |
| 504 | if (err < 0) { |
| 505 | printk(KERN_ERR "Failed to register with sysfs\n"); |
| 506 | goto out_sysfs_cleanup; |
| 507 | } |
| 508 | |
| 509 | return 0; |
| 510 | |
| 511 | out_sysfs_cleanup: |
| 512 | v9fs_sysfs_cleanup(); |
| 513 | |
| 514 | out_fs_unreg: |
| 515 | unregister_filesystem(&v9fs_fs_type); |
| 516 | |
| 517 | return err; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 518 | } |
| 519 | |
| 520 | /** |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 521 | * exit_v9fs - shutdown module |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 522 | * |
| 523 | */ |
| 524 | |
| 525 | static void __exit exit_v9fs(void) |
| 526 | { |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 527 | v9fs_sysfs_cleanup(); |
| 528 | v9fs_cache_unregister(); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 529 | unregister_filesystem(&v9fs_fs_type); |
| 530 | } |
| 531 | |
| 532 | module_init(init_v9fs) |
| 533 | module_exit(exit_v9fs) |
| 534 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 535 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 536 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
| 537 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); |
| 538 | MODULE_LICENSE("GPL"); |