blob: ce0778acc90abc1bde1e290c5eb659c6195b788e [file] [log] [blame]
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
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"
47#include "conv.h"
48#include "fid.h"
49
50static void v9fs_clear_inode(struct inode *);
51static struct super_operations v9fs_super_ops;
52
53/**
54 * v9fs_clear_inode - release an inode
55 * @inode: inode to release
56 *
57 */
58
59static void v9fs_clear_inode(struct inode *inode)
60{
61 filemap_fdatawrite(inode->i_mapping);
62}
63
64/**
65 * v9fs_set_super - set the superblock
66 * @s: super block
67 * @data: file system specific data
68 *
69 */
70
71static int v9fs_set_super(struct super_block *s, void *data)
72{
73 s->s_fs_info = data;
74 return set_anon_super(s, data);
75}
76
77/**
78 * v9fs_fill_super - populate superblock with info
79 * @sb: superblock
80 * @v9ses: session information
81 *
82 */
83
84static void
85v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
86 int flags)
87{
88 sb->s_maxbytes = MAX_LFS_FILESIZE;
89 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
90 sb->s_blocksize = 1 << sb->s_blocksize_bits;
91 sb->s_magic = V9FS_MAGIC;
92 sb->s_op = &v9fs_super_ops;
93
94 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
95 MS_NODIRATIME | MS_NOATIME;
96}
97
98/**
99 * v9fs_get_sb - mount a superblock
100 * @fs_type: file system type
101 * @flags: mount flags
102 * @dev_name: device name that was mounted
103 * @data: mount options
104 *
105 */
106
107static struct super_block *v9fs_get_sb(struct file_system_type
108 *fs_type, int flags,
109 const char *dev_name, void *data)
110{
111 struct super_block *sb = NULL;
112 struct v9fs_fcall *fcall = NULL;
113 struct inode *inode = NULL;
114 struct dentry *root = NULL;
115 struct v9fs_session_info *v9ses = NULL;
116 struct v9fs_fid *root_fid = NULL;
117 int mode = S_IRWXUGO | S_ISVTX;
118 uid_t uid = current->fsuid;
119 gid_t gid = current->fsgid;
120 int stat_result = 0;
121 int newfid = 0;
122 int retval = 0;
123
124 dprintk(DEBUG_VFS, " \n");
125
126 v9ses = kcalloc(1, sizeof(struct v9fs_session_info), GFP_KERNEL);
127 if (!v9ses)
128 return ERR_PTR(-ENOMEM);
129
130 if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
131 dprintk(DEBUG_ERROR, "problem initiating session\n");
132 retval = newfid;
133 goto free_session;
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;
153 goto release_inode;
154 }
155
156 sb->s_root = root;
157
158 /* Setup the Root Inode */
159 root_fid = v9fs_fid_create(root);
160 if (root_fid == NULL) {
161 retval = -ENOMEM;
162 goto release_dentry;
163 }
164
165 root_fid->fidopen = 0;
166 root_fid->v9ses = v9ses;
167
168 stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
169 if (stat_result < 0) {
170 dprintk(DEBUG_ERROR, "stat error\n");
171 v9fs_t_clunk(v9ses, newfid, NULL);
172 v9fs_put_idpool(newfid, &v9ses->fidpool);
173 } else {
174 root_fid->fid = newfid;
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_mistat2inode(fcall->params.rstat.stat, root->d_inode, sb);
179 }
180
181 kfree(fcall);
182
183 if (stat_result < 0) {
184 retval = stat_result;
185 goto release_dentry;
186 }
187
188 return sb;
189
190 release_dentry:
191 dput(sb->s_root);
192
193 release_inode:
194 iput(inode);
195
196 put_back_sb:
197 up_write(&sb->s_umount);
198 deactivate_super(sb);
199 v9fs_session_close(v9ses);
200
201 free_session:
202 kfree(v9ses);
203
204 return ERR_PTR(retval);
205}
206
207/**
208 * v9fs_kill_super - Kill Superblock
209 * @s: superblock
210 *
211 */
212
213static void v9fs_kill_super(struct super_block *s)
214{
215 struct v9fs_session_info *v9ses = s->s_fs_info;
216
217 dprintk(DEBUG_VFS, " %p\n", s);
218
219 v9fs_dentry_release(s->s_root); /* clunk root */
220
221 kill_anon_super(s);
222
223 v9fs_session_close(v9ses);
224 kfree(v9ses);
225 dprintk(DEBUG_VFS, "exiting kill_super\n");
226}
227
228/**
229 * v9fs_show_options - Show mount options in /proc/mounts
230 * @m: seq_file to write to
231 * @mnt: mount descriptor
232 *
233 */
234
235static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
236{
237 struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
238
239 if (v9ses->debug != 0)
240 seq_printf(m, ",debug=%u", v9ses->debug);
241 if (v9ses->port != V9FS_PORT)
242 seq_printf(m, ",port=%u", v9ses->port);
243 if (v9ses->maxdata != 9000)
244 seq_printf(m, ",msize=%u", v9ses->maxdata);
245 if (v9ses->afid != ~0)
246 seq_printf(m, ",afid=%u", v9ses->afid);
247 if (v9ses->proto == PROTO_UNIX)
248 seq_puts(m, ",proto=unix");
249 if (v9ses->extended == 0)
250 seq_puts(m, ",noextend");
251 if (v9ses->nodev == 1)
252 seq_puts(m, ",nodevmap");
253 seq_printf(m, ",name=%s", v9ses->name);
254 seq_printf(m, ",aname=%s", v9ses->remotename);
255 seq_printf(m, ",uid=%u", v9ses->uid);
256 seq_printf(m, ",gid=%u", v9ses->gid);
257 return 0;
258}
259
260static struct super_operations v9fs_super_ops = {
261 .statfs = simple_statfs,
262 .clear_inode = v9fs_clear_inode,
263 .show_options = v9fs_show_options,
264};
265
266struct file_system_type v9fs_fs_type = {
267 .name = "9P",
268 .get_sb = v9fs_get_sb,
269 .kill_sb = v9fs_kill_super,
270 .owner = THIS_MODULE,
271};