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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>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070028#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/file.h>
32#include <linux/stat.h>
33#include <linux/string.h>
34#include <linux/smp_lock.h>
35#include <linux/inet.h>
36#include <linux/pagemap.h>
37#include <linux/seq_file.h>
38#include <linux/mount.h>
39#include <linux/idr.h>
40
41#include "debug.h"
42#include "v9fs.h"
43#include "9p.h"
44#include "v9fs_vfs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070045#include "fid.h"
46
47static void v9fs_clear_inode(struct inode *);
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080048static const struct super_operations v9fs_super_ops;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070049
50/**
51 * v9fs_clear_inode - release an inode
52 * @inode: inode to release
53 *
54 */
55
56static void v9fs_clear_inode(struct inode *inode)
57{
58 filemap_fdatawrite(inode->i_mapping);
59}
60
61/**
62 * v9fs_set_super - set the superblock
63 * @s: super block
64 * @data: file system specific data
65 *
66 */
67
68static int v9fs_set_super(struct super_block *s, void *data)
69{
70 s->s_fs_info = data;
71 return set_anon_super(s, data);
72}
73
74/**
75 * v9fs_fill_super - populate superblock with info
76 * @sb: superblock
77 * @v9ses: session information
78 *
79 */
80
81static void
82v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
83 int flags)
84{
85 sb->s_maxbytes = MAX_LFS_FILESIZE;
86 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
87 sb->s_blocksize = 1 << sb->s_blocksize_bits;
88 sb->s_magic = V9FS_MAGIC;
89 sb->s_op = &v9fs_super_ops;
90
91 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
Christoph Hellwig0d456fa2006-01-09 20:52:15 -080092 MS_NOATIME;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070093}
94
95/**
96 * v9fs_get_sb - mount a superblock
97 * @fs_type: file system type
98 * @flags: mount flags
99 * @dev_name: device name that was mounted
100 * @data: mount options
David Howells454e2392006-06-23 02:02:57 -0700101 * @mnt: mountpoint record to be instantiated
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700102 *
103 */
104
David Howells454e2392006-06-23 02:02:57 -0700105static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
106 const char *dev_name, void *data,
107 struct vfsmount *mnt)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700108{
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)
David Howells454e2392006-06-23 02:02:57 -0700126 return -ENOMEM;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700127
128 if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
129 dprintk(DEBUG_ERROR, "problem initiating session\n");
David Howells454e2392006-06-23 02:02:57 -0700130 retval = newfid;
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700131 goto out_free_session;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700132 }
133
134 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
David Howells454e2392006-06-23 02:02:57 -0700135 if (IS_ERR(sb)) {
136 retval = PTR_ERR(sb);
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700137 goto out_close_session;
David Howells454e2392006-06-23 02:02:57 -0700138 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700139 v9fs_fill_super(sb, v9ses, flags);
140
141 inode = v9fs_get_inode(sb, S_IFDIR | mode);
142 if (IS_ERR(inode)) {
143 retval = PTR_ERR(inode);
144 goto put_back_sb;
145 }
146
147 inode->i_uid = uid;
148 inode->i_gid = gid;
149
150 root = d_alloc_root(inode);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700151 if (!root) {
152 retval = -ENOMEM;
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700153 goto put_back_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700154 }
155
156 sb->s_root = root;
157
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700158 stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
159 if (stat_result < 0) {
160 dprintk(DEBUG_ERROR, "stat error\n");
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800161 v9fs_t_clunk(v9ses, newfid);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700162 } else {
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700163 /* Setup the Root Inode */
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800164 root_fid = v9fs_fid_create(v9ses, newfid);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700165 if (root_fid == NULL) {
166 retval = -ENOMEM;
167 goto put_back_sb;
168 }
169
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800170 retval = v9fs_fid_insert(root_fid, root);
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800171 if (retval < 0) {
172 kfree(fcall);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800173 goto put_back_sb;
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800174 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800175
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800176 root_fid->qid = fcall->params.rstat.stat.qid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700177 root->d_inode->i_ino =
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800178 v9fs_qid2ino(&fcall->params.rstat.stat.qid);
179 v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700180 }
181
Eric Van Hensbergen74b80542006-03-02 02:54:32 -0800182 kfree(fcall);
183
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700184 if (stat_result < 0) {
185 retval = stat_result;
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700186 goto put_back_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700187 }
188
David Howells454e2392006-06-23 02:02:57 -0700189 return simple_set_mnt(mnt, sb);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700190
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700191out_close_session:
192 v9fs_session_close(v9ses);
193out_free_session:
194 kfree(v9ses);
David Howells454e2392006-06-23 02:02:57 -0700195 return retval;
Eric Van Hensbergen00fbc6d2006-04-10 22:54:06 -0700196
Latchesar Ionkovf71626a2005-09-22 21:43:53 -0700197put_back_sb:
198 /* deactivate_super calls v9fs_kill_super which will frees the rest */
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700199 up_write(&sb->s_umount);
200 deactivate_super(sb);
David Howells454e2392006-06-23 02:02:57 -0700201 return retval;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700202}
203
204/**
205 * v9fs_kill_super - Kill Superblock
206 * @s: superblock
207 *
208 */
209
210static void v9fs_kill_super(struct super_block *s)
211{
212 struct v9fs_session_info *v9ses = s->s_fs_info;
213
214 dprintk(DEBUG_VFS, " %p\n", s);
215
216 v9fs_dentry_release(s->s_root); /* clunk root */
217
218 kill_anon_super(s);
219
220 v9fs_session_close(v9ses);
221 kfree(v9ses);
222 dprintk(DEBUG_VFS, "exiting kill_super\n");
223}
224
225/**
226 * v9fs_show_options - Show mount options in /proc/mounts
227 * @m: seq_file to write to
228 * @mnt: mount descriptor
229 *
230 */
231
232static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
233{
234 struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
235
236 if (v9ses->debug != 0)
237 seq_printf(m, ",debug=%u", v9ses->debug);
238 if (v9ses->port != V9FS_PORT)
239 seq_printf(m, ",port=%u", v9ses->port);
240 if (v9ses->maxdata != 9000)
241 seq_printf(m, ",msize=%u", v9ses->maxdata);
242 if (v9ses->afid != ~0)
243 seq_printf(m, ",afid=%u", v9ses->afid);
244 if (v9ses->proto == PROTO_UNIX)
245 seq_puts(m, ",proto=unix");
246 if (v9ses->extended == 0)
247 seq_puts(m, ",noextend");
248 if (v9ses->nodev == 1)
249 seq_puts(m, ",nodevmap");
250 seq_printf(m, ",name=%s", v9ses->name);
251 seq_printf(m, ",aname=%s", v9ses->remotename);
252 seq_printf(m, ",uid=%u", v9ses->uid);
253 seq_printf(m, ",gid=%u", v9ses->gid);
254 return 0;
255}
256
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700257static void
Trond Myklebust8b512d92006-06-09 09:34:18 -0400258v9fs_umount_begin(struct vfsmount *vfsmnt, int flags)
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700259{
Trond Myklebust8b512d92006-06-09 09:34:18 -0400260 struct v9fs_session_info *v9ses = vfsmnt->mnt_sb->s_fs_info;
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700261
Trond Myklebust8b512d92006-06-09 09:34:18 -0400262 if (flags & MNT_FORCE)
263 v9fs_session_cancel(v9ses);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700264}
265
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800266static const struct super_operations v9fs_super_ops = {
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700267 .statfs = simple_statfs,
268 .clear_inode = v9fs_clear_inode,
269 .show_options = v9fs_show_options,
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700270 .umount_begin = v9fs_umount_begin,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700271};
272
273struct file_system_type v9fs_fs_type = {
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800274 .name = "9p",
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700275 .get_sb = v9fs_get_sb,
276 .kill_sb = v9fs_kill_super,
277 .owner = THIS_MODULE,
278};