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Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -07001/*
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 Hensbergen42e8c502006-03-25 03:07:28 -080011 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070013 *
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>
28#include <linux/config.h>
29#include <linux/module.h>
30#include <linux/errno.h>
31#include <linux/fs.h>
32#include <linux/file.h>
33#include <linux/stat.h>
34#include <linux/string.h>
35#include <linux/smp_lock.h>
36#include <linux/inet.h>
37#include <linux/pagemap.h>
38#include <linux/seq_file.h>
39#include <linux/mount.h>
40#include <linux/idr.h>
41
42#include "debug.h"
43#include "v9fs.h"
44#include "9p.h"
45#include "v9fs_vfs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070046#include "fid.h"
47
48static void v9fs_clear_inode(struct inode *);
49static struct super_operations v9fs_super_ops;
50
51/**
52 * v9fs_clear_inode - release an inode
53 * @inode: inode to release
54 *
55 */
56
57static void v9fs_clear_inode(struct inode *inode)
58{
59 filemap_fdatawrite(inode->i_mapping);
60}
61
62/**
63 * v9fs_set_super - set the superblock
64 * @s: super block
65 * @data: file system specific data
66 *
67 */
68
69static int v9fs_set_super(struct super_block *s, void *data)
70{
71 s->s_fs_info = data;
72 return set_anon_super(s, data);
73}
74
75/**
76 * v9fs_fill_super - populate superblock with info
77 * @sb: superblock
78 * @v9ses: session information
79 *
80 */
81
82static void
83v9fs_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 Hellwig0d456fa2006-01-09 20:52:15 -080093 MS_NOATIME;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070094}
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
102 *
103 */
104
105static struct super_block *v9fs_get_sb(struct file_system_type
106 *fs_type, int flags,
107 const char *dev_name, void *data)
108{
109 struct super_block *sb = NULL;
110 struct v9fs_fcall *fcall = NULL;
111 struct inode *inode = NULL;
112 struct dentry *root = NULL;
113 struct v9fs_session_info *v9ses = NULL;
114 struct v9fs_fid *root_fid = NULL;
115 int mode = S_IRWXUGO | S_ISVTX;
116 uid_t uid = current->fsuid;
117 gid_t gid = current->fsgid;
118 int stat_result = 0;
119 int newfid = 0;
120 int retval = 0;
121
122 dprintk(DEBUG_VFS, " \n");
123
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800124 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700125 if (!v9ses)
126 return ERR_PTR(-ENOMEM);
127
128 if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
129 dprintk(DEBUG_ERROR, "problem initiating session\n");
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800130 kfree(v9ses);
Al Viro192eaa22005-09-30 03:15:08 +0100131 return ERR_PTR(newfid);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700132 }
133
134 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
135
136 v9fs_fill_super(sb, v9ses, flags);
137
138 inode = v9fs_get_inode(sb, S_IFDIR | mode);
139 if (IS_ERR(inode)) {
140 retval = PTR_ERR(inode);
141 goto put_back_sb;
142 }
143
144 inode->i_uid = uid;
145 inode->i_gid = gid;
146
147 root = d_alloc_root(inode);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700148 if (!root) {
149 retval = -ENOMEM;
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700150 goto put_back_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700151 }
152
153 sb->s_root = root;
154
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700155 stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
156 if (stat_result < 0) {
157 dprintk(DEBUG_ERROR, "stat error\n");
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800158 v9fs_t_clunk(v9ses, newfid);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700159 } else {
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700160 /* Setup the Root Inode */
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800161 root_fid = v9fs_fid_create(v9ses, newfid);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700162 if (root_fid == NULL) {
163 retval = -ENOMEM;
164 goto put_back_sb;
165 }
166
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800167 retval = v9fs_fid_insert(root_fid, root);
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800168 if (retval < 0) {
169 kfree(fcall);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800170 goto put_back_sb;
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800171 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800172
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800173 root_fid->qid = fcall->params.rstat.stat.qid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700174 root->d_inode->i_ino =
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800175 v9fs_qid2ino(&fcall->params.rstat.stat.qid);
176 v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700177 }
178
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800179 kfree(fcall);
180
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700181 if (stat_result < 0) {
182 retval = stat_result;
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700183 goto put_back_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700184 }
185
186 return sb;
187
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700188put_back_sb:
189 /* deactivate_super calls v9fs_kill_super which will frees the rest */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700190 up_write(&sb->s_umount);
191 deactivate_super(sb);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700192 return ERR_PTR(retval);
193}
194
195/**
196 * v9fs_kill_super - Kill Superblock
197 * @s: superblock
198 *
199 */
200
201static void v9fs_kill_super(struct super_block *s)
202{
203 struct v9fs_session_info *v9ses = s->s_fs_info;
204
205 dprintk(DEBUG_VFS, " %p\n", s);
206
207 v9fs_dentry_release(s->s_root); /* clunk root */
208
209 kill_anon_super(s);
210
211 v9fs_session_close(v9ses);
212 kfree(v9ses);
213 dprintk(DEBUG_VFS, "exiting kill_super\n");
214}
215
216/**
217 * v9fs_show_options - Show mount options in /proc/mounts
218 * @m: seq_file to write to
219 * @mnt: mount descriptor
220 *
221 */
222
223static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
224{
225 struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
226
227 if (v9ses->debug != 0)
228 seq_printf(m, ",debug=%u", v9ses->debug);
229 if (v9ses->port != V9FS_PORT)
230 seq_printf(m, ",port=%u", v9ses->port);
231 if (v9ses->maxdata != 9000)
232 seq_printf(m, ",msize=%u", v9ses->maxdata);
233 if (v9ses->afid != ~0)
234 seq_printf(m, ",afid=%u", v9ses->afid);
235 if (v9ses->proto == PROTO_UNIX)
236 seq_puts(m, ",proto=unix");
237 if (v9ses->extended == 0)
238 seq_puts(m, ",noextend");
239 if (v9ses->nodev == 1)
240 seq_puts(m, ",nodevmap");
241 seq_printf(m, ",name=%s", v9ses->name);
242 seq_printf(m, ",aname=%s", v9ses->remotename);
243 seq_printf(m, ",uid=%u", v9ses->uid);
244 seq_printf(m, ",gid=%u", v9ses->gid);
245 return 0;
246}
247
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700248static void
249v9fs_umount_begin(struct super_block *sb)
250{
251 struct v9fs_session_info *v9ses = sb->s_fs_info;
252
253 v9fs_session_cancel(v9ses);
254}
255
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700256static struct super_operations v9fs_super_ops = {
257 .statfs = simple_statfs,
258 .clear_inode = v9fs_clear_inode,
259 .show_options = v9fs_show_options,
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700260 .umount_begin = v9fs_umount_begin,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700261};
262
263struct file_system_type v9fs_fs_type = {
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800264 .name = "9p",
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700265 .get_sb = v9fs_get_sb,
266 .kill_sb = v9fs_kill_super,
267 .owner = THIS_MODULE,
268};