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.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
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.
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
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/errno.h>
31 #include <linux/file.h>
32 #include <linux/stat.h>
33 #include <linux/string.h>
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>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/statfs.h>
42 #include <net/9p/9p.h>
43 #include <net/9p/client.h>
49 static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
52 * v9fs_set_super - set the superblock
54 * @data: file system specific data
58 static int v9fs_set_super(struct super_block *s, void *data)
61 return set_anon_super(s, data);
65 * v9fs_fill_super - populate superblock with info
67 * @v9ses: session information
68 * @flags: flags propagated from v9fs_get_sb()
73 v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
74 int flags, void *data)
76 sb->s_maxbytes = MAX_LFS_FILESIZE;
77 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
78 sb->s_blocksize = 1 << sb->s_blocksize_bits;
79 sb->s_magic = V9FS_MAGIC;
80 if (v9fs_proto_dotl(v9ses))
81 sb->s_op = &v9fs_super_ops_dotl;
83 sb->s_op = &v9fs_super_ops;
84 sb->s_bdi = &v9ses->bdi;
86 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
89 save_mount_options(sb, data);
93 * v9fs_get_sb - mount a superblock
94 * @fs_type: file system type
96 * @dev_name: device name that was mounted
97 * @data: mount options
98 * @mnt: mountpoint record to be instantiated
102 static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
103 const char *dev_name, void *data,
104 struct vfsmount *mnt)
106 struct super_block *sb = NULL;
107 struct inode *inode = NULL;
108 struct dentry *root = NULL;
109 struct v9fs_session_info *v9ses = NULL;
110 struct p9_wstat *st = NULL;
111 int mode = S_IRWXUGO | S_ISVTX;
115 P9_DPRINTK(P9_DEBUG_VFS, " \n");
117 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
121 fid = v9fs_session_init(v9ses, dev_name, data);
123 retval = PTR_ERR(fid);
127 st = p9_client_stat(fid);
129 retval = PTR_ERR(st);
133 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
135 retval = PTR_ERR(sb);
138 v9fs_fill_super(sb, v9ses, flags, data);
140 inode = v9fs_get_inode(sb, S_IFDIR | mode);
142 retval = PTR_ERR(inode);
146 root = d_alloc_root(inode);
154 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
156 v9fs_stat2inode(st, root->d_inode, sb);
158 v9fs_fid_add(root, fid);
162 P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
163 simple_set_mnt(mnt, sb);
171 p9_client_clunk(fid);
174 v9fs_session_close(v9ses);
181 deactivate_locked_super(sb);
186 * v9fs_kill_super - Kill Superblock
191 static void v9fs_kill_super(struct super_block *s)
193 struct v9fs_session_info *v9ses = s->s_fs_info;
195 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
198 v9fs_dentry_release(s->s_root); /* clunk root */
202 v9fs_session_cancel(v9ses);
203 v9fs_session_close(v9ses);
206 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
210 v9fs_umount_begin(struct super_block *sb)
212 struct v9fs_session_info *v9ses;
214 v9ses = sb->s_fs_info;
215 v9fs_session_begin_cancel(v9ses);
218 static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
220 struct v9fs_session_info *v9ses;
222 struct p9_rstatfs rs;
225 fid = v9fs_fid_lookup(dentry);
231 v9ses = v9fs_inode2v9ses(dentry->d_inode);
232 if (v9fs_proto_dotl(v9ses)) {
233 res = p9_client_statfs(fid, &rs);
235 buf->f_type = rs.type;
236 buf->f_bsize = rs.bsize;
237 buf->f_blocks = rs.blocks;
238 buf->f_bfree = rs.bfree;
239 buf->f_bavail = rs.bavail;
240 buf->f_files = rs.files;
241 buf->f_ffree = rs.ffree;
242 buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
243 buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
244 buf->f_namelen = rs.namelen;
249 res = simple_statfs(dentry, buf);
254 static const struct super_operations v9fs_super_ops = {
255 #ifdef CONFIG_9P_FSCACHE
256 .alloc_inode = v9fs_alloc_inode,
257 .destroy_inode = v9fs_destroy_inode,
259 .statfs = simple_statfs,
260 .clear_inode = v9fs_clear_inode,
261 .show_options = generic_show_options,
262 .umount_begin = v9fs_umount_begin,
265 static const struct super_operations v9fs_super_ops_dotl = {
266 #ifdef CONFIG_9P_FSCACHE
267 .alloc_inode = v9fs_alloc_inode,
268 .destroy_inode = v9fs_destroy_inode,
270 .statfs = v9fs_statfs,
271 .clear_inode = v9fs_clear_inode,
272 .show_options = generic_show_options,
273 .umount_begin = v9fs_umount_begin,
276 struct file_system_type v9fs_fs_type = {
278 .get_sb = v9fs_get_sb,
279 .kill_sb = v9fs_kill_super,
280 .owner = THIS_MODULE,