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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
David Howells454e2392006-06-23 02:02:57 -0700102 * @mnt: mountpoint record to be instantiated
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700103 *
104 */
105
David Howells454e2392006-06-23 02:02:57 -0700106static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
107 const char *dev_name, void *data,
108 struct vfsmount *mnt)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700109{
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 Ionkov1dac06b2006-01-08 01:05:02 -0800125 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700126 if (!v9ses)
David Howells454e2392006-06-23 02:02:57 -0700127 return -ENOMEM;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700128
129 if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
130 dprintk(DEBUG_ERROR, "problem initiating session\n");
David Howells454e2392006-06-23 02:02:57 -0700131 retval = newfid;
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700132 goto out_free_session;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700133 }
134
135 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
David Howells454e2392006-06-23 02:02:57 -0700136 if (IS_ERR(sb)) {
137 retval = PTR_ERR(sb);
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700138 goto out_close_session;
David Howells454e2392006-06-23 02:02:57 -0700139 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700140 v9fs_fill_super(sb, v9ses, flags);
141
142 inode = v9fs_get_inode(sb, S_IFDIR | mode);
143 if (IS_ERR(inode)) {
144 retval = PTR_ERR(inode);
145 goto put_back_sb;
146 }
147
148 inode->i_uid = uid;
149 inode->i_gid = gid;
150
151 root = d_alloc_root(inode);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700152 if (!root) {
153 retval = -ENOMEM;
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700154 goto put_back_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700155 }
156
157 sb->s_root = root;
158
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700159 stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
160 if (stat_result < 0) {
161 dprintk(DEBUG_ERROR, "stat error\n");
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800162 v9fs_t_clunk(v9ses, newfid);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700163 } else {
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700164 /* Setup the Root Inode */
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800165 root_fid = v9fs_fid_create(v9ses, newfid);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700166 if (root_fid == NULL) {
167 retval = -ENOMEM;
168 goto put_back_sb;
169 }
170
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800171 retval = v9fs_fid_insert(root_fid, root);
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800172 if (retval < 0) {
173 kfree(fcall);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800174 goto put_back_sb;
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800175 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800176
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800177 root_fid->qid = fcall->params.rstat.stat.qid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700178 root->d_inode->i_ino =
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800179 v9fs_qid2ino(&fcall->params.rstat.stat.qid);
180 v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700181 }
182
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800183 kfree(fcall);
184
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700185 if (stat_result < 0) {
186 retval = stat_result;
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700187 goto put_back_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700188 }
189
David Howells454e2392006-06-23 02:02:57 -0700190 return simple_set_mnt(mnt, sb);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700191
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700192out_close_session:
193 v9fs_session_close(v9ses);
194out_free_session:
195 kfree(v9ses);
David Howells454e2392006-06-23 02:02:57 -0700196 return retval;
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700197
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700198put_back_sb:
199 /* deactivate_super calls v9fs_kill_super which will frees the rest */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700200 up_write(&sb->s_umount);
201 deactivate_super(sb);
David Howells454e2392006-06-23 02:02:57 -0700202 return retval;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700203}
204
205/**
206 * v9fs_kill_super - Kill Superblock
207 * @s: superblock
208 *
209 */
210
211static void v9fs_kill_super(struct super_block *s)
212{
213 struct v9fs_session_info *v9ses = s->s_fs_info;
214
215 dprintk(DEBUG_VFS, " %p\n", s);
216
217 v9fs_dentry_release(s->s_root); /* clunk root */
218
219 kill_anon_super(s);
220
221 v9fs_session_close(v9ses);
222 kfree(v9ses);
223 dprintk(DEBUG_VFS, "exiting kill_super\n");
224}
225
226/**
227 * v9fs_show_options - Show mount options in /proc/mounts
228 * @m: seq_file to write to
229 * @mnt: mount descriptor
230 *
231 */
232
233static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
234{
235 struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
236
237 if (v9ses->debug != 0)
238 seq_printf(m, ",debug=%u", v9ses->debug);
239 if (v9ses->port != V9FS_PORT)
240 seq_printf(m, ",port=%u", v9ses->port);
241 if (v9ses->maxdata != 9000)
242 seq_printf(m, ",msize=%u", v9ses->maxdata);
243 if (v9ses->afid != ~0)
244 seq_printf(m, ",afid=%u", v9ses->afid);
245 if (v9ses->proto == PROTO_UNIX)
246 seq_puts(m, ",proto=unix");
247 if (v9ses->extended == 0)
248 seq_puts(m, ",noextend");
249 if (v9ses->nodev == 1)
250 seq_puts(m, ",nodevmap");
251 seq_printf(m, ",name=%s", v9ses->name);
252 seq_printf(m, ",aname=%s", v9ses->remotename);
253 seq_printf(m, ",uid=%u", v9ses->uid);
254 seq_printf(m, ",gid=%u", v9ses->gid);
255 return 0;
256}
257
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700258static void
Trond Myklebust8b512d92006-06-09 09:34:18 -0400259v9fs_umount_begin(struct vfsmount *vfsmnt, int flags)
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700260{
Trond Myklebust8b512d92006-06-09 09:34:18 -0400261 struct v9fs_session_info *v9ses = vfsmnt->mnt_sb->s_fs_info;
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700262
Trond Myklebust8b512d92006-06-09 09:34:18 -0400263 if (flags & MNT_FORCE)
264 v9fs_session_cancel(v9ses);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700265}
266
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700267static struct super_operations v9fs_super_ops = {
268 .statfs = simple_statfs,
269 .clear_inode = v9fs_clear_inode,
270 .show_options = v9fs_show_options,
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700271 .umount_begin = v9fs_umount_begin,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700272};
273
274struct file_system_type v9fs_fs_type = {
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800275 .name = "9p",
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700276 .get_sb = v9fs_get_sb,
277 .kill_sb = v9fs_kill_super,
278 .owner = THIS_MODULE,
279};