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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>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070034#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>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040039#include <linux/sched.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050040#include <net/9p/9p.h>
41#include <net/9p/client.h>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070042
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070043#include "v9fs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070044#include "v9fs_vfs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070045#include "fid.h"
46
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080047static const struct super_operations v9fs_super_ops;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070048
49/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070050 * v9fs_set_super - set the superblock
51 * @s: super block
52 * @data: file system specific data
53 *
54 */
55
56static int v9fs_set_super(struct super_block *s, void *data)
57{
58 s->s_fs_info = data;
59 return set_anon_super(s, data);
60}
61
62/**
63 * v9fs_fill_super - populate superblock with info
64 * @sb: superblock
65 * @v9ses: session information
Eric Van Hensbergenee443992008-03-05 07:08:09 -060066 * @flags: flags propagated from v9fs_get_sb()
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070067 *
68 */
69
70static void
71v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -050072 int flags, void *data)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070073{
74 sb->s_maxbytes = MAX_LFS_FILESIZE;
75 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
76 sb->s_blocksize = 1 << sb->s_blocksize_bits;
77 sb->s_magic = V9FS_MAGIC;
78 sb->s_op = &v9fs_super_ops;
79
80 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
Christoph Hellwig0d456fa2006-01-09 20:52:15 -080081 MS_NOATIME;
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -050082
83 save_mount_options(sb, data);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070084}
85
86/**
87 * v9fs_get_sb - mount a superblock
88 * @fs_type: file system type
89 * @flags: mount flags
90 * @dev_name: device name that was mounted
91 * @data: mount options
David Howells454e2392006-06-23 02:02:57 -070092 * @mnt: mountpoint record to be instantiated
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070093 *
94 */
95
David Howells454e2392006-06-23 02:02:57 -070096static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
97 const char *dev_name, void *data,
98 struct vfsmount *mnt)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070099{
100 struct super_block *sb = NULL;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700101 struct inode *inode = NULL;
102 struct dentry *root = NULL;
103 struct v9fs_session_info *v9ses = NULL;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500104 struct p9_wstat *st = NULL;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700105 int mode = S_IRWXUGO | S_ISVTX;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500106 struct p9_fid *fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700107 int retval = 0;
108
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500109 P9_DPRINTK(P9_DEBUG_VFS, " \n");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700110
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800111 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700112 if (!v9ses)
David Howells454e2392006-06-23 02:02:57 -0700113 return -ENOMEM;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700114
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500115 fid = v9fs_session_init(v9ses, dev_name, data);
116 if (IS_ERR(fid)) {
117 retval = PTR_ERR(fid);
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500118 goto close_session;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500119 }
120
121 st = p9_client_stat(fid);
122 if (IS_ERR(st)) {
123 retval = PTR_ERR(st);
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500124 goto clunk_fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700125 }
126
127 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
David Howells454e2392006-06-23 02:02:57 -0700128 if (IS_ERR(sb)) {
129 retval = PTR_ERR(sb);
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500130 goto free_stat;
David Howells454e2392006-06-23 02:02:57 -0700131 }
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500132 v9fs_fill_super(sb, v9ses, flags, data);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700133
134 inode = v9fs_get_inode(sb, S_IFDIR | mode);
135 if (IS_ERR(inode)) {
136 retval = PTR_ERR(inode);
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500137 goto release_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700138 }
139
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700140 root = d_alloc_root(inode);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700141 if (!root) {
Al Viroc96f5852009-05-06 01:35:04 -0400142 iput(inode);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700143 retval = -ENOMEM;
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500144 goto release_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700145 }
146
147 sb->s_root = root;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500148 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500149
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500150 v9fs_stat2inode(st, root->d_inode, sb);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500151
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500152 v9fs_fid_add(root, fid);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500153 p9stat_free(st);
Latchesar Ionkovdda6b022007-11-06 08:02:53 -0600154 kfree(st);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700155
Sukadev Bhattiprolua3ec9472009-03-04 12:06:34 -0800156P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
157 simple_set_mnt(mnt, sb);
158 return 0;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700159
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500160free_stat:
Abhishek Kulkarni1b5ab3e2009-07-19 13:41:52 -0600161 p9stat_free(st);
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500162 kfree(st);
163
164clunk_fid:
165 p9_client_clunk(fid);
166
167close_session:
168 v9fs_session_close(v9ses);
169 kfree(v9ses);
Abhishek Kulkarni1b5ab3e2009-07-19 13:41:52 -0600170 return retval;
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500171
Abhishek Kulkarni1b5ab3e2009-07-19 13:41:52 -0600172release_sb:
173 p9stat_free(st);
174 kfree(st);
175 deactivate_locked_super(sb);
David Howells454e2392006-06-23 02:02:57 -0700176 return retval;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700177}
178
179/**
180 * v9fs_kill_super - Kill Superblock
181 * @s: superblock
182 *
183 */
184
185static void v9fs_kill_super(struct super_block *s)
186{
187 struct v9fs_session_info *v9ses = s->s_fs_info;
188
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500189 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700190
191 v9fs_dentry_release(s->s_root); /* clunk root */
192
193 kill_anon_super(s);
194
195 v9fs_session_close(v9ses);
196 kfree(v9ses);
Abhishek Kulkarni1b5ab3e2009-07-19 13:41:52 -0600197 s->s_fs_info = NULL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500198 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700199}
200
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700201static void
Al Viro42faad92008-04-24 07:21:56 -0400202v9fs_umount_begin(struct super_block *sb)
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700203{
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200204 struct v9fs_session_info *v9ses;
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700205
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200206 v9ses = sb->s_fs_info;
Al Viro42faad92008-04-24 07:21:56 -0400207 v9fs_session_cancel(v9ses);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700208}
209
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800210static const struct super_operations v9fs_super_ops = {
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500211#ifdef CONFIG_9P_FSCACHE
212 .alloc_inode = v9fs_alloc_inode,
213 .destroy_inode = v9fs_destroy_inode,
214#endif
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700215 .statfs = simple_statfs,
216 .clear_inode = v9fs_clear_inode,
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500217 .show_options = generic_show_options,
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700218 .umount_begin = v9fs_umount_begin,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700219};
220
221struct file_system_type v9fs_fs_type = {
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800222 .name = "9p",
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700223 .get_sb = v9fs_get_sb,
224 .kill_sb = v9fs_kill_super,
225 .owner = THIS_MODULE,
226};