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 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 26 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 27 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 28 | #include <linux/module.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/fs.h> |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 31 | #include <linux/sched.h> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 32 | #include <linux/parser.h> |
| 33 | #include <linux/idr.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 35 | #include <net/9p/9p.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 36 | #include <net/9p/client.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 37 | #include <net/9p/transport.h> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 38 | #include "v9fs.h" |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 39 | #include "v9fs_vfs.h" |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 40 | #include "cache.h" |
| 41 | |
| 42 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); |
| 43 | static LIST_HEAD(v9fs_sessionlist); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 44 | struct kmem_cache *v9fs_inode_cache; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 47 | * Option Parsing (code inspired by NFS code) |
| 48 | * NOTE: each transport will parse its own options |
| 49 | */ |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 50 | |
| 51 | enum { |
| 52 | /* Options that take integer arguments */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 53 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 54 | /* String options */ |
Fabian Frederick | cb9af41 | 2015-06-05 19:09:35 +0200 | [diff] [blame] | 55 | Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 56 | /* Options that take no arguments */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 57 | Opt_nodevmap, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 58 | /* Cache options */ |
Dominique Martinet | fb89b45 | 2014-01-10 13:44:09 +0100 | [diff] [blame] | 59 | Opt_cache_loose, Opt_fscache, Opt_mmap, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 60 | /* Access options */ |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame] | 61 | Opt_access, Opt_posixacl, |
Dinu-Razvan Chis-Serban | 3191224 | 2018-09-05 16:44:12 +0900 | [diff] [blame] | 62 | /* Lock timeout option */ |
| 63 | Opt_locktimeout, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 64 | /* Error token */ |
| 65 | Opt_err |
| 66 | }; |
| 67 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 68 | static const match_table_t tokens = { |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 69 | {Opt_debug, "debug=%x"}, |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 70 | {Opt_dfltuid, "dfltuid=%u"}, |
| 71 | {Opt_dfltgid, "dfltgid=%u"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 72 | {Opt_afid, "afid=%u"}, |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 73 | {Opt_uname, "uname=%s"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 74 | {Opt_remotename, "aname=%s"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 75 | {Opt_nodevmap, "nodevmap"}, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 76 | {Opt_cache, "cache=%s"}, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 77 | {Opt_cache_loose, "loose"}, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 78 | {Opt_fscache, "fscache"}, |
Dominique Martinet | fb89b45 | 2014-01-10 13:44:09 +0100 | [diff] [blame] | 79 | {Opt_mmap, "mmap"}, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 80 | {Opt_cachetag, "cachetag=%s"}, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 81 | {Opt_access, "access=%s"}, |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame] | 82 | {Opt_posixacl, "posixacl"}, |
Dinu-Razvan Chis-Serban | 3191224 | 2018-09-05 16:44:12 +0900 | [diff] [blame] | 83 | {Opt_locktimeout, "locktimeout=%u"}, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 84 | {Opt_err, NULL} |
| 85 | }; |
| 86 | |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 87 | /* Interpret mount options for cache mode */ |
| 88 | static int get_cache_mode(char *s) |
| 89 | { |
| 90 | int version = -EINVAL; |
| 91 | |
| 92 | if (!strcmp(s, "loose")) { |
| 93 | version = CACHE_LOOSE; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 94 | p9_debug(P9_DEBUG_9P, "Cache mode: loose\n"); |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 95 | } else if (!strcmp(s, "fscache")) { |
| 96 | version = CACHE_FSCACHE; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 97 | p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n"); |
Dominique Martinet | fb89b45 | 2014-01-10 13:44:09 +0100 | [diff] [blame] | 98 | } else if (!strcmp(s, "mmap")) { |
| 99 | version = CACHE_MMAP; |
| 100 | p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n"); |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 101 | } else if (!strcmp(s, "none")) { |
| 102 | version = CACHE_NONE; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 103 | p9_debug(P9_DEBUG_9P, "Cache mode: none\n"); |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 104 | } else |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 105 | pr_info("Unknown Cache mode %s\n", s); |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 106 | return version; |
| 107 | } |
| 108 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 109 | /** |
| 110 | * v9fs_parse_options - parse mount options into session structure |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 111 | * @v9ses: existing v9fs session information |
| 112 | * |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 113 | * Return 0 upon success, -ERRNO upon failure. |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 114 | */ |
| 115 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 116 | 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] | 117 | { |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 118 | char *options, *tmp_options; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 119 | substring_t args[MAX_OPT_ARGS]; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 120 | char *p; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 121 | int option = 0; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 122 | char *s, *e; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 123 | int ret = 0; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 124 | |
| 125 | /* setup defaults */ |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 126 | v9ses->afid = ~0; |
| 127 | v9ses->debug = 0; |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 128 | v9ses->cache = CACHE_NONE; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 129 | #ifdef CONFIG_9P_FSCACHE |
| 130 | v9ses->cachetag = NULL; |
| 131 | #endif |
Dinu-Razvan Chis-Serban | 3191224 | 2018-09-05 16:44:12 +0900 | [diff] [blame] | 132 | v9ses->session_lock_timeout = P9_LOCK_TIMEOUT; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 133 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 134 | if (!opts) |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 135 | return 0; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 136 | |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 137 | tmp_options = kstrdup(opts, GFP_KERNEL); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 138 | if (!tmp_options) { |
| 139 | ret = -ENOMEM; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 140 | goto fail_option_alloc; |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 141 | } |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 142 | options = tmp_options; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 143 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 144 | while ((p = strsep(&options, ",")) != NULL) { |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 145 | int token, r; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 146 | if (!*p) |
| 147 | continue; |
| 148 | token = match_token(p, tokens, args); |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 149 | switch (token) { |
| 150 | case Opt_debug: |
| 151 | r = match_int(&args[0], &option); |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 152 | if (r < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 153 | p9_debug(P9_DEBUG_ERROR, |
| 154 | "integer field, but no integer?\n"); |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 155 | ret = r; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 156 | continue; |
| 157 | } |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 158 | v9ses->debug = option; |
Eric Van Hensbergen | 10fa16e | 2007-07-16 16:02:49 -0500 | [diff] [blame] | 159 | #ifdef CONFIG_NET_9P_DEBUG |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 160 | p9_debug_level = option; |
Eric Van Hensbergen | 10fa16e | 2007-07-16 16:02:49 -0500 | [diff] [blame] | 161 | #endif |
Eric Van Hensbergen | 9e2f668 | 2007-07-13 13:05:21 -0500 | [diff] [blame] | 162 | break; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 163 | |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 164 | case Opt_dfltuid: |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 165 | r = match_int(&args[0], &option); |
| 166 | if (r < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 167 | p9_debug(P9_DEBUG_ERROR, |
| 168 | "integer field, but no integer?\n"); |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 169 | ret = r; |
| 170 | continue; |
| 171 | } |
Eric W. Biederman | 76ed23a | 2013-01-30 11:57:40 -0800 | [diff] [blame] | 172 | v9ses->dfltuid = make_kuid(current_user_ns(), option); |
| 173 | if (!uid_valid(v9ses->dfltuid)) { |
| 174 | p9_debug(P9_DEBUG_ERROR, |
| 175 | "uid field, but not a uid?\n"); |
| 176 | ret = -EINVAL; |
| 177 | continue; |
| 178 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 179 | break; |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 180 | case Opt_dfltgid: |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 181 | r = match_int(&args[0], &option); |
| 182 | if (r < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 183 | p9_debug(P9_DEBUG_ERROR, |
| 184 | "integer field, but no integer?\n"); |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 185 | ret = r; |
| 186 | continue; |
| 187 | } |
Eric W. Biederman | 76ed23a | 2013-01-30 11:57:40 -0800 | [diff] [blame] | 188 | v9ses->dfltgid = make_kgid(current_user_ns(), option); |
| 189 | if (!gid_valid(v9ses->dfltgid)) { |
| 190 | p9_debug(P9_DEBUG_ERROR, |
| 191 | "gid field, but not a gid?\n"); |
| 192 | ret = -EINVAL; |
| 193 | continue; |
| 194 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 195 | break; |
| 196 | case Opt_afid: |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 197 | r = match_int(&args[0], &option); |
| 198 | if (r < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 199 | p9_debug(P9_DEBUG_ERROR, |
| 200 | "integer field, but no integer?\n"); |
Aneesh Kumar K.V | 4d5077f | 2011-08-30 12:19:34 +0530 | [diff] [blame] | 201 | ret = r; |
| 202 | continue; |
| 203 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 204 | v9ses->afid = option; |
| 205 | break; |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 206 | case Opt_uname: |
Jeff Layton | e549c13 | 2012-09-07 07:55:25 -0400 | [diff] [blame] | 207 | kfree(v9ses->uname); |
| 208 | v9ses->uname = match_strdup(&args[0]); |
| 209 | if (!v9ses->uname) { |
| 210 | ret = -ENOMEM; |
| 211 | goto free_and_return; |
| 212 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 213 | break; |
| 214 | case Opt_remotename: |
Jeff Layton | e549c13 | 2012-09-07 07:55:25 -0400 | [diff] [blame] | 215 | kfree(v9ses->aname); |
| 216 | v9ses->aname = match_strdup(&args[0]); |
| 217 | if (!v9ses->aname) { |
| 218 | ret = -ENOMEM; |
| 219 | goto free_and_return; |
| 220 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 221 | break; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 222 | case Opt_nodevmap: |
| 223 | v9ses->nodev = 1; |
| 224 | break; |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 225 | case Opt_cache_loose: |
| 226 | v9ses->cache = CACHE_LOOSE; |
| 227 | break; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 228 | case Opt_fscache: |
| 229 | v9ses->cache = CACHE_FSCACHE; |
| 230 | break; |
Dominique Martinet | fb89b45 | 2014-01-10 13:44:09 +0100 | [diff] [blame] | 231 | case Opt_mmap: |
| 232 | v9ses->cache = CACHE_MMAP; |
| 233 | break; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 234 | case Opt_cachetag: |
| 235 | #ifdef CONFIG_9P_FSCACHE |
| 236 | v9ses->cachetag = match_strdup(&args[0]); |
| 237 | #endif |
| 238 | break; |
| 239 | case Opt_cache: |
| 240 | s = match_strdup(&args[0]); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 241 | if (!s) { |
| 242 | ret = -ENOMEM; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 243 | p9_debug(P9_DEBUG_ERROR, |
| 244 | "problem allocating copy of cache arg\n"); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 245 | goto free_and_return; |
| 246 | } |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 247 | ret = get_cache_mode(s); |
| 248 | if (ret == -EINVAL) { |
| 249 | kfree(s); |
| 250 | goto free_and_return; |
| 251 | } |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 252 | |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 253 | v9ses->cache = ret; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 254 | kfree(s); |
| 255 | break; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 256 | |
| 257 | case Opt_access: |
| 258 | s = match_strdup(&args[0]); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 259 | if (!s) { |
| 260 | ret = -ENOMEM; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 261 | p9_debug(P9_DEBUG_ERROR, |
| 262 | "problem allocating copy of access arg\n"); |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 263 | goto free_and_return; |
| 264 | } |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 265 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 266 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 267 | if (strcmp(s, "user") == 0) |
| 268 | v9ses->flags |= V9FS_ACCESS_USER; |
| 269 | else if (strcmp(s, "any") == 0) |
| 270 | v9ses->flags |= V9FS_ACCESS_ANY; |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 271 | else if (strcmp(s, "client") == 0) { |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 272 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 273 | } else { |
Eric W. Biederman | 76ed23a | 2013-01-30 11:57:40 -0800 | [diff] [blame] | 274 | uid_t uid; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 275 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
Eric W. Biederman | 76ed23a | 2013-01-30 11:57:40 -0800 | [diff] [blame] | 276 | uid = simple_strtoul(s, &e, 10); |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 277 | if (*e != '\0') { |
| 278 | ret = -EINVAL; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 279 | pr_info("Unknown access argument %s\n", |
| 280 | s); |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 281 | kfree(s); |
| 282 | goto free_and_return; |
| 283 | } |
Eric W. Biederman | 76ed23a | 2013-01-30 11:57:40 -0800 | [diff] [blame] | 284 | v9ses->uid = make_kuid(current_user_ns(), uid); |
| 285 | if (!uid_valid(v9ses->uid)) { |
| 286 | ret = -EINVAL; |
| 287 | pr_info("Uknown uid %s\n", s); |
| 288 | kfree(s); |
| 289 | goto free_and_return; |
| 290 | } |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 291 | } |
Prem Karat | a2dd43b | 2011-05-06 18:24:18 +0530 | [diff] [blame] | 292 | |
Adrian Bunk | 0a97629 | 2007-10-23 13:48:50 -0500 | [diff] [blame] | 293 | kfree(s); |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 294 | break; |
| 295 | |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame] | 296 | case Opt_posixacl: |
| 297 | #ifdef CONFIG_9P_FS_POSIX_ACL |
| 298 | v9ses->flags |= V9FS_POSIX_ACL; |
| 299 | #else |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 300 | p9_debug(P9_DEBUG_ERROR, |
| 301 | "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n"); |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame] | 302 | #endif |
| 303 | break; |
| 304 | |
Dinu-Razvan Chis-Serban | 3191224 | 2018-09-05 16:44:12 +0900 | [diff] [blame] | 305 | case Opt_locktimeout: |
| 306 | r = match_int(&args[0], &option); |
| 307 | if (r < 0) { |
| 308 | p9_debug(P9_DEBUG_ERROR, |
| 309 | "integer field, but no integer?\n"); |
| 310 | ret = r; |
| 311 | continue; |
| 312 | } |
| 313 | if (option < 1) { |
| 314 | p9_debug(P9_DEBUG_ERROR, |
| 315 | "locktimeout must be a greater than zero integer.\n"); |
| 316 | ret = -EINVAL; |
| 317 | continue; |
| 318 | } |
| 319 | v9ses->session_lock_timeout = (long)option * HZ; |
| 320 | break; |
| 321 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 322 | default: |
| 323 | continue; |
| 324 | } |
| 325 | } |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 326 | |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 327 | free_and_return: |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 328 | kfree(tmp_options); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 329 | fail_option_alloc: |
Eric Van Hensbergen | bf2d29c | 2010-02-08 17:59:34 -0600 | [diff] [blame] | 330 | return ret; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 331 | } |
| 332 | |
| 333 | /** |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 334 | * v9fs_session_init - initialize session |
| 335 | * @v9ses: session information structure |
| 336 | * @dev_name: device being mounted |
| 337 | * @data: options |
| 338 | * |
| 339 | */ |
| 340 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 341 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 342 | const char *dev_name, char *data) |
| 343 | { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 344 | struct p9_fid *fid; |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 345 | int rc = -ENOMEM; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 346 | |
Jeff Layton | e549c13 | 2012-09-07 07:55:25 -0400 | [diff] [blame] | 347 | v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL); |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 348 | if (!v9ses->uname) |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 349 | goto err_names; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 350 | |
Jeff Layton | e549c13 | 2012-09-07 07:55:25 -0400 | [diff] [blame] | 351 | v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL); |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 352 | if (!v9ses->aname) |
| 353 | goto err_names; |
Aneesh Kumar K.V | a534c8d | 2010-06-30 19:18:50 +0530 | [diff] [blame] | 354 | init_rwsem(&v9ses->rename_sem); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 355 | |
Christoph Hellwig | b4caecd | 2015-01-14 10:42:32 +0100 | [diff] [blame] | 356 | rc = bdi_setup_and_register(&v9ses->bdi, "9p"); |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 357 | if (rc) |
| 358 | goto err_names; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 359 | |
Eric W. Biederman | 76ed23a | 2013-01-30 11:57:40 -0800 | [diff] [blame] | 360 | v9ses->uid = INVALID_UID; |
Latchesar Ionkov | bd32b82 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 361 | v9ses->dfltuid = V9FS_DEFUID; |
| 362 | v9ses->dfltgid = V9FS_DEFGID; |
Jim Meyering | ab31267 | 2008-03-06 17:10:28 -0600 | [diff] [blame] | 363 | |
Abhishek Kulkarni | 4b53e4b | 2009-08-17 16:42:28 -0500 | [diff] [blame] | 364 | v9ses->clnt = p9_client_create(dev_name, data); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 365 | if (IS_ERR(v9ses->clnt)) { |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 366 | rc = PTR_ERR(v9ses->clnt); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 367 | p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 368 | goto err_bdi; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 369 | } |
| 370 | |
Venkateswararao Jujjuri (JV) | 6752a1e | 2011-01-26 16:20:35 -0800 | [diff] [blame] | 371 | v9ses->flags = V9FS_ACCESS_USER; |
| 372 | |
| 373 | if (p9_is_proto_dotl(v9ses->clnt)) { |
| 374 | v9ses->flags = V9FS_ACCESS_CLIENT; |
Sripathi Kodi | 476ada0 | 2010-03-17 17:02:38 +0000 | [diff] [blame] | 375 | v9ses->flags |= V9FS_PROTO_2000L; |
Venkateswararao Jujjuri (JV) | 6752a1e | 2011-01-26 16:20:35 -0800 | [diff] [blame] | 376 | } else if (p9_is_proto_dotu(v9ses->clnt)) { |
Sripathi Kodi | 476ada0 | 2010-03-17 17:02:38 +0000 | [diff] [blame] | 377 | v9ses->flags |= V9FS_PROTO_2000U; |
Venkateswararao Jujjuri (JV) | 6752a1e | 2011-01-26 16:20:35 -0800 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | rc = v9fs_parse_options(v9ses, data); |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 381 | if (rc < 0) |
| 382 | goto err_clnt; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 383 | |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 384 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 385 | |
Aneesh Kumar K.V | 76381a4 | 2010-09-28 00:27:41 +0530 | [diff] [blame] | 386 | if (!v9fs_proto_dotl(v9ses) && |
| 387 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
| 388 | /* |
| 389 | * We support ACCESS_CLIENT only for dotl. |
| 390 | * Fall back to ACCESS_USER |
| 391 | */ |
| 392 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 393 | v9ses->flags |= V9FS_ACCESS_USER; |
| 394 | } |
| 395 | /*FIXME !! */ |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 396 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
Aneesh Kumar K.V | 9ffaf63 | 2010-06-01 09:26:18 +0000 | [diff] [blame] | 397 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 398 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
| 399 | |
| 400 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 401 | v9ses->flags |= V9FS_ACCESS_ANY; |
Eric W. Biederman | 76ed23a | 2013-01-30 11:57:40 -0800 | [diff] [blame] | 402 | v9ses->uid = INVALID_UID; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 403 | } |
Venkateswararao Jujjuri (JV) | e782ef7 | 2011-01-25 15:40:54 -0800 | [diff] [blame] | 404 | if (!v9fs_proto_dotl(v9ses) || |
| 405 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
| 406 | /* |
| 407 | * We support ACL checks on clinet only if the protocol is |
| 408 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. |
| 409 | */ |
| 410 | v9ses->flags &= ~V9FS_ACL_MASK; |
| 411 | } |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 412 | |
Eric W. Biederman | f791f7c | 2013-01-29 16:09:41 -0800 | [diff] [blame] | 413 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 414 | v9ses->aname); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 415 | if (IS_ERR(fid)) { |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 416 | rc = PTR_ERR(fid); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 417 | p9_debug(P9_DEBUG_ERROR, "cannot attach\n"); |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 418 | goto err_clnt; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 419 | } |
| 420 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 421 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
| 422 | fid->uid = v9ses->uid; |
| 423 | else |
Eric W. Biederman | b464255 | 2013-01-30 11:48:53 -0800 | [diff] [blame] | 424 | fid->uid = INVALID_UID; |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 425 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 426 | #ifdef CONFIG_9P_FSCACHE |
| 427 | /* register the session for caching */ |
| 428 | v9fs_cache_session_get_cookie(v9ses); |
| 429 | #endif |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 430 | spin_lock(&v9fs_sessionlist_lock); |
| 431 | list_add(&v9ses->slist, &v9fs_sessionlist); |
| 432 | spin_unlock(&v9fs_sessionlist_lock); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 433 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 434 | return fid; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 435 | |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 436 | err_clnt: |
| 437 | p9_client_destroy(v9ses->clnt); |
| 438 | err_bdi: |
Jens Axboe | 0ed07dd | 2010-04-22 11:42:00 +0200 | [diff] [blame] | 439 | bdi_destroy(&v9ses->bdi); |
Tejun Heo | 412a19b | 2015-06-08 14:57:31 +0900 | [diff] [blame] | 440 | err_names: |
| 441 | kfree(v9ses->uname); |
| 442 | kfree(v9ses->aname); |
| 443 | return ERR_PTR(rc); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | /** |
| 447 | * v9fs_session_close - shutdown a session |
| 448 | * @v9ses: session information structure |
| 449 | * |
| 450 | */ |
| 451 | |
| 452 | void v9fs_session_close(struct v9fs_session_info *v9ses) |
| 453 | { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 454 | if (v9ses->clnt) { |
| 455 | p9_client_destroy(v9ses->clnt); |
| 456 | v9ses->clnt = NULL; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 457 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 458 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 459 | #ifdef CONFIG_9P_FSCACHE |
Zheng Bin | 3ce4ded | 2020-06-15 09:21:53 +0800 | [diff] [blame] | 460 | if (v9ses->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 461 | v9fs_cache_session_put_cookie(v9ses); |
Zheng Bin | 3ce4ded | 2020-06-15 09:21:53 +0800 | [diff] [blame] | 462 | kfree(v9ses->cachetag); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 463 | #endif |
Jeff Layton | e549c13 | 2012-09-07 07:55:25 -0400 | [diff] [blame] | 464 | kfree(v9ses->uname); |
| 465 | kfree(v9ses->aname); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 466 | |
Jens Axboe | 0ed07dd | 2010-04-22 11:42:00 +0200 | [diff] [blame] | 467 | bdi_destroy(&v9ses->bdi); |
| 468 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 469 | spin_lock(&v9fs_sessionlist_lock); |
| 470 | list_del(&v9ses->slist); |
| 471 | spin_unlock(&v9fs_sessionlist_lock); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 472 | } |
| 473 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 474 | /** |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 475 | * v9fs_session_cancel - terminate a session |
| 476 | * @v9ses: session to terminate |
| 477 | * |
| 478 | * mark transport as disconnected and cancel all pending requests. |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 479 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 480 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 481 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 482 | p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 483 | p9_client_disconnect(v9ses->clnt); |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 484 | } |
| 485 | |
Aneesh Kumar K.V | 6d96d3a | 2010-03-29 18:13:59 -0500 | [diff] [blame] | 486 | /** |
| 487 | * v9fs_session_begin_cancel - Begin terminate of a session |
| 488 | * @v9ses: session to terminate |
| 489 | * |
| 490 | * After this call we don't allow any request other than clunk. |
| 491 | */ |
| 492 | |
| 493 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) |
| 494 | { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 495 | p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); |
Aneesh Kumar K.V | 6d96d3a | 2010-03-29 18:13:59 -0500 | [diff] [blame] | 496 | p9_client_begin_disconnect(v9ses->clnt); |
| 497 | } |
| 498 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 499 | extern int v9fs_error_init(void); |
| 500 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 501 | static struct kobject *v9fs_kobj; |
| 502 | |
| 503 | #ifdef CONFIG_9P_FSCACHE |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 504 | /** |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 505 | * caches_show - list caches associated with a session |
| 506 | * |
| 507 | * Returns the size of buffer written. |
| 508 | */ |
| 509 | |
| 510 | static ssize_t caches_show(struct kobject *kobj, |
| 511 | struct kobj_attribute *attr, |
| 512 | char *buf) |
| 513 | { |
| 514 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; |
| 515 | struct v9fs_session_info *v9ses; |
| 516 | |
| 517 | spin_lock(&v9fs_sessionlist_lock); |
| 518 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { |
| 519 | if (v9ses->cachetag) { |
| 520 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); |
| 521 | if (n < 0) { |
| 522 | count = n; |
| 523 | break; |
| 524 | } |
| 525 | |
| 526 | count += n; |
| 527 | limit -= n; |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | spin_unlock(&v9fs_sessionlist_lock); |
| 532 | return count; |
| 533 | } |
| 534 | |
| 535 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); |
| 536 | #endif /* CONFIG_9P_FSCACHE */ |
| 537 | |
| 538 | static struct attribute *v9fs_attrs[] = { |
| 539 | #ifdef CONFIG_9P_FSCACHE |
| 540 | &v9fs_attr_cache.attr, |
| 541 | #endif |
| 542 | NULL, |
| 543 | }; |
| 544 | |
| 545 | static struct attribute_group v9fs_attr_group = { |
| 546 | .attrs = v9fs_attrs, |
| 547 | }; |
| 548 | |
| 549 | /** |
| 550 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface |
| 551 | * |
| 552 | */ |
| 553 | |
Fabian Frederick | bdbeacd | 2014-06-04 16:06:25 -0700 | [diff] [blame] | 554 | static int __init v9fs_sysfs_init(void) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 555 | { |
| 556 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); |
| 557 | if (!v9fs_kobj) |
| 558 | return -ENOMEM; |
| 559 | |
| 560 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { |
| 561 | kobject_put(v9fs_kobj); |
| 562 | return -ENOMEM; |
| 563 | } |
| 564 | |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | /** |
| 569 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface |
| 570 | * |
| 571 | */ |
| 572 | |
| 573 | static void v9fs_sysfs_cleanup(void) |
| 574 | { |
| 575 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); |
| 576 | kobject_put(v9fs_kobj); |
| 577 | } |
| 578 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 579 | static void v9fs_inode_init_once(void *foo) |
| 580 | { |
| 581 | struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; |
| 582 | #ifdef CONFIG_9P_FSCACHE |
| 583 | v9inode->fscache = NULL; |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 584 | #endif |
Aneesh Kumar K.V | fd2421f | 2011-07-11 16:40:59 +0000 | [diff] [blame] | 585 | memset(&v9inode->qid, 0, sizeof(v9inode->qid)); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 586 | inode_init_once(&v9inode->vfs_inode); |
| 587 | } |
| 588 | |
| 589 | /** |
| 590 | * v9fs_init_inode_cache - initialize a cache for 9P |
| 591 | * Returns 0 on success. |
| 592 | */ |
| 593 | static int v9fs_init_inode_cache(void) |
| 594 | { |
| 595 | v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", |
| 596 | sizeof(struct v9fs_inode), |
| 597 | 0, (SLAB_RECLAIM_ACCOUNT| |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 598 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 599 | v9fs_inode_init_once); |
| 600 | if (!v9fs_inode_cache) |
| 601 | return -ENOMEM; |
| 602 | |
| 603 | return 0; |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * v9fs_destroy_inode_cache - destroy the cache of 9P inode |
| 608 | * |
| 609 | */ |
| 610 | static void v9fs_destroy_inode_cache(void) |
| 611 | { |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 612 | /* |
| 613 | * Make sure all delayed rcu free inodes are flushed before we |
| 614 | * destroy cache. |
| 615 | */ |
| 616 | rcu_barrier(); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 617 | kmem_cache_destroy(v9fs_inode_cache); |
| 618 | } |
| 619 | |
| 620 | static int v9fs_cache_register(void) |
| 621 | { |
| 622 | int ret; |
| 623 | ret = v9fs_init_inode_cache(); |
| 624 | if (ret < 0) |
| 625 | return ret; |
| 626 | #ifdef CONFIG_9P_FSCACHE |
Al Viro | 8061a6f | 2013-09-17 08:10:18 -0400 | [diff] [blame] | 627 | ret = fscache_register_netfs(&v9fs_cache_netfs); |
| 628 | if (ret < 0) |
| 629 | v9fs_destroy_inode_cache(); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 630 | #endif |
Al Viro | 8061a6f | 2013-09-17 08:10:18 -0400 | [diff] [blame] | 631 | return ret; |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | static void v9fs_cache_unregister(void) |
| 635 | { |
| 636 | v9fs_destroy_inode_cache(); |
| 637 | #ifdef CONFIG_9P_FSCACHE |
| 638 | fscache_unregister_netfs(&v9fs_cache_netfs); |
| 639 | #endif |
| 640 | } |
| 641 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 642 | /** |
| 643 | * init_v9fs - Initialize module |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 644 | * |
| 645 | */ |
| 646 | |
| 647 | static int __init init_v9fs(void) |
| 648 | { |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 649 | int err; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 650 | pr_info("Installing v9fs 9p2000 file system support\n"); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 651 | /* TODO: Setup list of registered trasnport modules */ |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 652 | |
| 653 | err = v9fs_cache_register(); |
| 654 | if (err < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 655 | pr_err("Failed to register v9fs for caching\n"); |
Al Viro | 2226a28 | 2012-03-17 02:37:05 -0400 | [diff] [blame] | 656 | return err; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | err = v9fs_sysfs_init(); |
| 660 | if (err < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 661 | pr_err("Failed to register with sysfs\n"); |
Al Viro | 2226a28 | 2012-03-17 02:37:05 -0400 | [diff] [blame] | 662 | goto out_cache; |
| 663 | } |
| 664 | err = register_filesystem(&v9fs_fs_type); |
| 665 | if (err < 0) { |
| 666 | pr_err("Failed to register filesystem\n"); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 667 | goto out_sysfs_cleanup; |
| 668 | } |
| 669 | |
| 670 | return 0; |
| 671 | |
| 672 | out_sysfs_cleanup: |
| 673 | v9fs_sysfs_cleanup(); |
| 674 | |
Al Viro | 2226a28 | 2012-03-17 02:37:05 -0400 | [diff] [blame] | 675 | out_cache: |
| 676 | v9fs_cache_unregister(); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 677 | |
| 678 | return err; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | /** |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 682 | * exit_v9fs - shutdown module |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 683 | * |
| 684 | */ |
| 685 | |
| 686 | static void __exit exit_v9fs(void) |
| 687 | { |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 688 | v9fs_sysfs_cleanup(); |
| 689 | v9fs_cache_unregister(); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 690 | unregister_filesystem(&v9fs_fs_type); |
| 691 | } |
| 692 | |
| 693 | module_init(init_v9fs) |
| 694 | module_exit(exit_v9fs) |
| 695 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 696 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 697 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
| 698 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); |
| 699 | MODULE_LICENSE("GPL"); |