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 |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to: |
| 22 | * Free Software Foundation |
| 23 | * 51 Franklin Street, Fifth Floor |
| 24 | * Boston, MA 02111-1301 USA |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/config.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/fs.h> |
| 33 | #include <linux/file.h> |
| 34 | #include <linux/stat.h> |
| 35 | #include <linux/string.h> |
| 36 | #include <linux/smp_lock.h> |
| 37 | #include <linux/inet.h> |
| 38 | #include <linux/pagemap.h> |
| 39 | #include <linux/seq_file.h> |
| 40 | #include <linux/mount.h> |
| 41 | #include <linux/idr.h> |
| 42 | |
| 43 | #include "debug.h" |
| 44 | #include "v9fs.h" |
| 45 | #include "9p.h" |
| 46 | #include "v9fs_vfs.h" |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 47 | #include "fid.h" |
| 48 | |
| 49 | static void v9fs_clear_inode(struct inode *); |
| 50 | static struct super_operations v9fs_super_ops; |
| 51 | |
| 52 | /** |
| 53 | * v9fs_clear_inode - release an inode |
| 54 | * @inode: inode to release |
| 55 | * |
| 56 | */ |
| 57 | |
| 58 | static void v9fs_clear_inode(struct inode *inode) |
| 59 | { |
| 60 | filemap_fdatawrite(inode->i_mapping); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * v9fs_set_super - set the superblock |
| 65 | * @s: super block |
| 66 | * @data: file system specific data |
| 67 | * |
| 68 | */ |
| 69 | |
| 70 | static int v9fs_set_super(struct super_block *s, void *data) |
| 71 | { |
| 72 | s->s_fs_info = data; |
| 73 | return set_anon_super(s, data); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * v9fs_fill_super - populate superblock with info |
| 78 | * @sb: superblock |
| 79 | * @v9ses: session information |
| 80 | * |
| 81 | */ |
| 82 | |
| 83 | static void |
| 84 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, |
| 85 | int flags) |
| 86 | { |
| 87 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 88 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); |
| 89 | sb->s_blocksize = 1 << sb->s_blocksize_bits; |
| 90 | sb->s_magic = V9FS_MAGIC; |
| 91 | sb->s_op = &v9fs_super_ops; |
| 92 | |
| 93 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | |
| 94 | MS_NODIRATIME | MS_NOATIME; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * v9fs_get_sb - mount a superblock |
| 99 | * @fs_type: file system type |
| 100 | * @flags: mount flags |
| 101 | * @dev_name: device name that was mounted |
| 102 | * @data: mount options |
| 103 | * |
| 104 | */ |
| 105 | |
| 106 | static struct super_block *v9fs_get_sb(struct file_system_type |
| 107 | *fs_type, int flags, |
| 108 | const char *dev_name, void *data) |
| 109 | { |
| 110 | struct super_block *sb = NULL; |
| 111 | struct v9fs_fcall *fcall = NULL; |
| 112 | struct inode *inode = NULL; |
| 113 | struct dentry *root = NULL; |
| 114 | struct v9fs_session_info *v9ses = NULL; |
| 115 | struct v9fs_fid *root_fid = NULL; |
| 116 | int mode = S_IRWXUGO | S_ISVTX; |
| 117 | uid_t uid = current->fsuid; |
| 118 | gid_t gid = current->fsgid; |
| 119 | int stat_result = 0; |
| 120 | int newfid = 0; |
| 121 | int retval = 0; |
| 122 | |
| 123 | dprintk(DEBUG_VFS, " \n"); |
| 124 | |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame^] | 125 | v9ses = kmalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 126 | if (!v9ses) |
| 127 | return ERR_PTR(-ENOMEM); |
| 128 | |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame^] | 129 | memset(v9ses, 0, sizeof(struct v9fs_session_info)); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 130 | if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) { |
| 131 | dprintk(DEBUG_ERROR, "problem initiating session\n"); |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 132 | kfree(v9ses); |
Al Viro | 192eaa2 | 2005-09-30 03:15:08 +0100 | [diff] [blame] | 133 | return ERR_PTR(newfid); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); |
| 137 | |
| 138 | v9fs_fill_super(sb, v9ses, flags); |
| 139 | |
| 140 | inode = v9fs_get_inode(sb, S_IFDIR | mode); |
| 141 | if (IS_ERR(inode)) { |
| 142 | retval = PTR_ERR(inode); |
| 143 | goto put_back_sb; |
| 144 | } |
| 145 | |
| 146 | inode->i_uid = uid; |
| 147 | inode->i_gid = gid; |
| 148 | |
| 149 | root = d_alloc_root(inode); |
| 150 | |
| 151 | if (!root) { |
| 152 | retval = -ENOMEM; |
Latchesar Ionkov | f71626a | 2005-09-22 21:43:53 -0700 | [diff] [blame] | 153 | goto put_back_sb; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | sb->s_root = root; |
| 157 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 158 | stat_result = v9fs_t_stat(v9ses, newfid, &fcall); |
| 159 | if (stat_result < 0) { |
| 160 | dprintk(DEBUG_ERROR, "stat error\n"); |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 161 | v9fs_t_clunk(v9ses, newfid); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 162 | v9fs_put_idpool(newfid, &v9ses->fidpool); |
| 163 | } else { |
Latchesar Ionkov | 0b8dd17 | 2005-09-27 21:45:24 -0700 | [diff] [blame] | 164 | /* Setup the Root Inode */ |
| 165 | root_fid = v9fs_fid_create(root, v9ses, newfid, 0); |
| 166 | if (root_fid == NULL) { |
| 167 | retval = -ENOMEM; |
| 168 | goto put_back_sb; |
| 169 | } |
| 170 | |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame^] | 171 | root_fid->qid = fcall->params.rstat.stat.qid; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 172 | root->d_inode->i_ino = |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame^] | 173 | v9fs_qid2ino(&fcall->params.rstat.stat.qid); |
| 174 | v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | kfree(fcall); |
| 178 | |
| 179 | if (stat_result < 0) { |
| 180 | retval = stat_result; |
Latchesar Ionkov | f71626a | 2005-09-22 21:43:53 -0700 | [diff] [blame] | 181 | goto put_back_sb; |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | return sb; |
| 185 | |
Latchesar Ionkov | f71626a | 2005-09-22 21:43:53 -0700 | [diff] [blame] | 186 | put_back_sb: |
| 187 | /* deactivate_super calls v9fs_kill_super which will frees the rest */ |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 188 | up_write(&sb->s_umount); |
| 189 | deactivate_super(sb); |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 190 | return ERR_PTR(retval); |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * v9fs_kill_super - Kill Superblock |
| 195 | * @s: superblock |
| 196 | * |
| 197 | */ |
| 198 | |
| 199 | static void v9fs_kill_super(struct super_block *s) |
| 200 | { |
| 201 | struct v9fs_session_info *v9ses = s->s_fs_info; |
| 202 | |
| 203 | dprintk(DEBUG_VFS, " %p\n", s); |
| 204 | |
| 205 | v9fs_dentry_release(s->s_root); /* clunk root */ |
| 206 | |
| 207 | kill_anon_super(s); |
| 208 | |
| 209 | v9fs_session_close(v9ses); |
| 210 | kfree(v9ses); |
| 211 | dprintk(DEBUG_VFS, "exiting kill_super\n"); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * v9fs_show_options - Show mount options in /proc/mounts |
| 216 | * @m: seq_file to write to |
| 217 | * @mnt: mount descriptor |
| 218 | * |
| 219 | */ |
| 220 | |
| 221 | static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt) |
| 222 | { |
| 223 | struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info; |
| 224 | |
| 225 | if (v9ses->debug != 0) |
| 226 | seq_printf(m, ",debug=%u", v9ses->debug); |
| 227 | if (v9ses->port != V9FS_PORT) |
| 228 | seq_printf(m, ",port=%u", v9ses->port); |
| 229 | if (v9ses->maxdata != 9000) |
| 230 | seq_printf(m, ",msize=%u", v9ses->maxdata); |
| 231 | if (v9ses->afid != ~0) |
| 232 | seq_printf(m, ",afid=%u", v9ses->afid); |
| 233 | if (v9ses->proto == PROTO_UNIX) |
| 234 | seq_puts(m, ",proto=unix"); |
| 235 | if (v9ses->extended == 0) |
| 236 | seq_puts(m, ",noextend"); |
| 237 | if (v9ses->nodev == 1) |
| 238 | seq_puts(m, ",nodevmap"); |
| 239 | seq_printf(m, ",name=%s", v9ses->name); |
| 240 | seq_printf(m, ",aname=%s", v9ses->remotename); |
| 241 | seq_printf(m, ",uid=%u", v9ses->uid); |
| 242 | seq_printf(m, ",gid=%u", v9ses->gid); |
| 243 | return 0; |
| 244 | } |
| 245 | |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 246 | static void |
| 247 | v9fs_umount_begin(struct super_block *sb) |
| 248 | { |
| 249 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
| 250 | |
| 251 | v9fs_session_cancel(v9ses); |
| 252 | } |
| 253 | |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 254 | static struct super_operations v9fs_super_ops = { |
| 255 | .statfs = simple_statfs, |
| 256 | .clear_inode = v9fs_clear_inode, |
| 257 | .show_options = v9fs_show_options, |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 258 | .umount_begin = v9fs_umount_begin, |
Eric Van Hensbergen | 9e82cf6 | 2005-09-09 13:04:20 -0700 | [diff] [blame] | 259 | }; |
| 260 | |
| 261 | struct file_system_type v9fs_fs_type = { |
| 262 | .name = "9P", |
| 263 | .get_sb = v9fs_get_sb, |
| 264 | .kill_sb = v9fs_kill_super, |
| 265 | .owner = THIS_MODULE, |
| 266 | }; |