2 * linux/fs/9p/vfs_super.c
4 * This file contians superblock ops for 9P2000. It is intended that
5 * you mount this file system on directories.
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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.
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.
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
28 #include <linux/kernel.h>
29 #include <linux/config.h>
30 #include <linux/module.h>
31 #include <linux/errno.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>
49 static void v9fs_clear_inode(struct inode *);
50 static struct super_operations v9fs_super_ops;
53 * v9fs_clear_inode - release an inode
54 * @inode: inode to release
58 static void v9fs_clear_inode(struct inode *inode)
60 filemap_fdatawrite(inode->i_mapping);
64 * v9fs_set_super - set the superblock
66 * @data: file system specific data
70 static int v9fs_set_super(struct super_block *s, void *data)
73 return set_anon_super(s, data);
77 * v9fs_fill_super - populate superblock with info
79 * @v9ses: session information
84 v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
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;
93 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
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
106 static struct super_block *v9fs_get_sb(struct file_system_type
108 const char *dev_name, void *data)
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;
123 dprintk(DEBUG_VFS, " \n");
125 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
127 return ERR_PTR(-ENOMEM);
129 if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
130 dprintk(DEBUG_ERROR, "problem initiating session\n");
132 return ERR_PTR(newfid);
135 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
137 v9fs_fill_super(sb, v9ses, flags);
139 inode = v9fs_get_inode(sb, S_IFDIR | mode);
141 retval = PTR_ERR(inode);
148 root = d_alloc_root(inode);
156 stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
157 if (stat_result < 0) {
158 dprintk(DEBUG_ERROR, "stat error\n");
160 v9fs_t_clunk(v9ses, newfid);
162 /* Setup the Root Inode */
163 root_fid = v9fs_fid_create(v9ses, newfid);
164 if (root_fid == NULL) {
169 retval = v9fs_fid_insert(root_fid, root);
175 root_fid->qid = fcall->params.rstat.stat.qid;
176 root->d_inode->i_ino =
177 v9fs_qid2ino(&fcall->params.rstat.stat.qid);
178 v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb);
183 if (stat_result < 0) {
184 retval = stat_result;
191 /* deactivate_super calls v9fs_kill_super which will frees the rest */
192 up_write(&sb->s_umount);
193 deactivate_super(sb);
194 return ERR_PTR(retval);
198 * v9fs_kill_super - Kill Superblock
203 static void v9fs_kill_super(struct super_block *s)
205 struct v9fs_session_info *v9ses = s->s_fs_info;
207 dprintk(DEBUG_VFS, " %p\n", s);
209 v9fs_dentry_release(s->s_root); /* clunk root */
213 v9fs_session_close(v9ses);
215 dprintk(DEBUG_VFS, "exiting kill_super\n");
219 * v9fs_show_options - Show mount options in /proc/mounts
220 * @m: seq_file to write to
221 * @mnt: mount descriptor
225 static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
227 struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
229 if (v9ses->debug != 0)
230 seq_printf(m, ",debug=%u", v9ses->debug);
231 if (v9ses->port != V9FS_PORT)
232 seq_printf(m, ",port=%u", v9ses->port);
233 if (v9ses->maxdata != 9000)
234 seq_printf(m, ",msize=%u", v9ses->maxdata);
235 if (v9ses->afid != ~0)
236 seq_printf(m, ",afid=%u", v9ses->afid);
237 if (v9ses->proto == PROTO_UNIX)
238 seq_puts(m, ",proto=unix");
239 if (v9ses->extended == 0)
240 seq_puts(m, ",noextend");
241 if (v9ses->nodev == 1)
242 seq_puts(m, ",nodevmap");
243 seq_printf(m, ",name=%s", v9ses->name);
244 seq_printf(m, ",aname=%s", v9ses->remotename);
245 seq_printf(m, ",uid=%u", v9ses->uid);
246 seq_printf(m, ",gid=%u", v9ses->gid);
251 v9fs_umount_begin(struct super_block *sb)
253 struct v9fs_session_info *v9ses = sb->s_fs_info;
255 v9fs_session_cancel(v9ses);
258 static struct super_operations v9fs_super_ops = {
259 .statfs = simple_statfs,
260 .clear_inode = v9fs_clear_inode,
261 .show_options = v9fs_show_options,
262 .umount_begin = v9fs_umount_begin,
265 struct file_system_type v9fs_fs_type = {
267 .get_sb = v9fs_get_sb,
268 .kill_sb = v9fs_kill_super,
269 .owner = THIS_MODULE,