Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/vfs_super.c |
| 3 | * |
| 4 | * This file contians superblock ops for 9P2000. It is intended that |
| 5 | * you mount this file system on directories. |
| 6 | * |
| 7 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 8 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 9 | * |
| 10 | * 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] | 11 | * it under the terms of the GNU General Public License version 2 |
| 12 | * as published by the Free Software Foundation. |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to: |
| 21 | * Free Software Foundation |
| 22 | * 51 Franklin Street, Fifth Floor |
| 23 | * Boston, MA 02111-1301 USA |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <linux/kernel.h> |
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> |
| 31 | #include <linux/file.h> |
| 32 | #include <linux/stat.h> |
| 33 | #include <linux/string.h> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 34 | #include <linux/inet.h> |
| 35 | #include <linux/pagemap.h> |
| 36 | #include <linux/seq_file.h> |
| 37 | #include <linux/mount.h> |
| 38 | #include <linux/idr.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 39 | #include <linux/sched.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 40 | #include <net/9p/9p.h> |
| 41 | #include <net/9p/client.h> |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 42 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 43 | #include "v9fs.h" |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 44 | #include "v9fs_vfs.h" |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 45 | #include "fid.h" |
| 46 | |
| 47 | static void v9fs_clear_inode(struct inode *); |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 48 | static const struct super_operations v9fs_super_ops; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 49 | |
| 50 | /** |
| 51 | * v9fs_clear_inode - release an inode |
| 52 | * @inode: inode to release |
| 53 | * |
| 54 | */ |
| 55 | |
| 56 | static void v9fs_clear_inode(struct inode *inode) |
| 57 | { |
| 58 | filemap_fdatawrite(inode->i_mapping); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * v9fs_set_super - set the superblock |
| 63 | * @s: super block |
| 64 | * @data: file system specific data |
| 65 | * |
| 66 | */ |
| 67 | |
| 68 | static int v9fs_set_super(struct super_block *s, void *data) |
| 69 | { |
| 70 | s->s_fs_info = data; |
| 71 | return set_anon_super(s, data); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * v9fs_fill_super - populate superblock with info |
| 76 | * @sb: superblock |
| 77 | * @v9ses: session information |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 78 | * @flags: flags propagated from v9fs_get_sb() |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 79 | * |
| 80 | */ |
| 81 | |
| 82 | static void |
| 83 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, |
| 84 | int flags) |
| 85 | { |
| 86 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 87 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); |
| 88 | sb->s_blocksize = 1 << sb->s_blocksize_bits; |
| 89 | sb->s_magic = V9FS_MAGIC; |
| 90 | sb->s_op = &v9fs_super_ops; |
| 91 | |
| 92 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | |
Christoph Hellwig | 0d456fa | 2006-01-09 20:52:15 -0800 | [diff] [blame] | 93 | MS_NOATIME; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | /** |
| 97 | * v9fs_get_sb - mount a superblock |
| 98 | * @fs_type: file system type |
| 99 | * @flags: mount flags |
| 100 | * @dev_name: device name that was mounted |
| 101 | * @data: mount options |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 102 | * @mnt: mountpoint record to be instantiated |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 103 | * |
| 104 | */ |
| 105 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 106 | static int v9fs_get_sb(struct file_system_type *fs_type, int flags, |
| 107 | const char *dev_name, void *data, |
| 108 | struct vfsmount *mnt) |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 109 | { |
| 110 | struct super_block *sb = NULL; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 111 | struct inode *inode = NULL; |
| 112 | struct dentry *root = NULL; |
| 113 | struct v9fs_session_info *v9ses = NULL; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 114 | struct p9_stat *st = NULL; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 115 | int mode = S_IRWXUGO | S_ISVTX; |
| 116 | uid_t uid = current->fsuid; |
| 117 | gid_t gid = current->fsgid; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 118 | struct p9_fid *fid; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 119 | int retval = 0; |
| 120 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 121 | P9_DPRINTK(P9_DEBUG_VFS, " \n"); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 122 | |
Latchesar Ionkov | dda6b02 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 123 | st = NULL; |
Latchesar Ionkov | 1dac06b | 2006-01-08 01:05:02 -0800 | [diff] [blame] | 124 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 125 | if (!v9ses) |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 126 | return -ENOMEM; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 127 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 128 | fid = v9fs_session_init(v9ses, dev_name, data); |
| 129 | if (IS_ERR(fid)) { |
| 130 | retval = PTR_ERR(fid); |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame^] | 131 | goto close_session; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | st = p9_client_stat(fid); |
| 135 | if (IS_ERR(st)) { |
| 136 | retval = PTR_ERR(st); |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame^] | 137 | goto clunk_fid; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 141 | if (IS_ERR(sb)) { |
| 142 | retval = PTR_ERR(sb); |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame^] | 143 | goto free_stat; |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 144 | } |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 145 | v9fs_fill_super(sb, v9ses, flags); |
| 146 | |
| 147 | inode = v9fs_get_inode(sb, S_IFDIR | mode); |
| 148 | if (IS_ERR(inode)) { |
| 149 | retval = PTR_ERR(inode); |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame^] | 150 | goto release_sb; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | inode->i_uid = uid; |
| 154 | inode->i_gid = gid; |
| 155 | |
| 156 | root = d_alloc_root(inode); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 157 | if (!root) { |
| 158 | retval = -ENOMEM; |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame^] | 159 | goto release_sb; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | sb->s_root = root; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 163 | root->d_inode->i_ino = v9fs_qid2ino(&st->qid); |
| 164 | v9fs_stat2inode(st, root->d_inode, sb); |
| 165 | v9fs_fid_add(root, fid); |
Latchesar Ionkov | dda6b02 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 166 | kfree(st); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 167 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 168 | return simple_set_mnt(mnt, sb); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 169 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame^] | 170 | release_sb: |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 171 | if (sb) { |
| 172 | up_write(&sb->s_umount); |
| 173 | deactivate_super(sb); |
| 174 | } |
| 175 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame^] | 176 | free_stat: |
| 177 | kfree(st); |
| 178 | |
| 179 | clunk_fid: |
| 180 | p9_client_clunk(fid); |
| 181 | |
| 182 | close_session: |
| 183 | v9fs_session_close(v9ses); |
| 184 | kfree(v9ses); |
| 185 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 186 | return retval; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | /** |
| 190 | * v9fs_kill_super - Kill Superblock |
| 191 | * @s: superblock |
| 192 | * |
| 193 | */ |
| 194 | |
| 195 | static void v9fs_kill_super(struct super_block *s) |
| 196 | { |
| 197 | struct v9fs_session_info *v9ses = s->s_fs_info; |
| 198 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 199 | P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 200 | |
| 201 | v9fs_dentry_release(s->s_root); /* clunk root */ |
| 202 | |
| 203 | kill_anon_super(s); |
| 204 | |
| 205 | v9fs_session_close(v9ses); |
| 206 | kfree(v9ses); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 207 | P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n"); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | /** |
| 211 | * v9fs_show_options - Show mount options in /proc/mounts |
| 212 | * @m: seq_file to write to |
| 213 | * @mnt: mount descriptor |
| 214 | * |
| 215 | */ |
| 216 | |
| 217 | static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt) |
| 218 | { |
| 219 | struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info; |
| 220 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 221 | seq_printf(m, "%s", v9ses->options); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 222 | return 0; |
| 223 | } |
| 224 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 225 | static void |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 226 | v9fs_umount_begin(struct super_block *sb) |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 227 | { |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 228 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 229 | |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 230 | v9fs_session_cancel(v9ses); |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 231 | } |
| 232 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 233 | static const struct super_operations v9fs_super_ops = { |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 234 | .statfs = simple_statfs, |
| 235 | .clear_inode = v9fs_clear_inode, |
| 236 | .show_options = v9fs_show_options, |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 237 | .umount_begin = v9fs_umount_begin, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 238 | }; |
| 239 | |
| 240 | struct file_system_type v9fs_fs_type = { |
Eric Van Hensbergen | 67543e5 | 2006-03-25 03:07:29 -0800 | [diff] [blame] | 241 | .name = "9p", |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 242 | .get_sb = v9fs_get_sb, |
| 243 | .kill_sb = v9fs_kill_super, |
| 244 | .owner = THIS_MODULE, |
| 245 | }; |