2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/module.h>
20 #include <linux/buffer_head.h>
22 #include <linux/pagemap.h>
23 #include <linux/highmem.h>
24 #include <linux/time.h>
25 #include <linux/init.h>
26 #include <linux/string.h>
27 #include <linux/smp_lock.h>
28 #include <linux/backing-dev.h>
29 #include <linux/mpage.h>
30 #include <linux/swap.h>
31 #include <linux/writeback.h>
32 #include <linux/statfs.h>
33 #include <linux/compat.h>
36 #include "transaction.h"
37 #include "btrfs_inode.h"
39 #include "print-tree.h"
41 #define BTRFS_SUPER_MAGIC 0x9123682E
43 static struct super_operations btrfs_super_ops;
45 static void btrfs_put_super (struct super_block * sb)
47 struct btrfs_root *root = btrfs_sb(sb);
50 ret = close_ctree(root);
52 printk("close ctree returns %d\n", ret);
57 static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
60 struct dentry * root_dentry;
61 struct btrfs_super_block *disk_super;
62 struct btrfs_root *tree_root;
63 struct btrfs_inode *bi;
66 sb->s_maxbytes = MAX_LFS_FILESIZE;
67 sb->s_magic = BTRFS_SUPER_MAGIC;
68 sb->s_op = &btrfs_super_ops;
71 tree_root = open_ctree(sb);
73 if (!tree_root || IS_ERR(tree_root)) {
74 printk("btrfs: open_ctree failed\n");
77 sb->s_fs_info = tree_root;
78 disk_super = tree_root->fs_info->disk_super;
79 inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
82 bi->location.objectid = inode->i_ino;
83 bi->location.offset = 0;
84 bi->location.flags = 0;
87 btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
93 if (inode->i_state & I_NEW) {
94 btrfs_read_locked_inode(inode);
95 unlock_new_inode(inode);
98 root_dentry = d_alloc_root(inode);
104 sb->s_root = root_dentry;
105 btrfs_transaction_queue_work(tree_root, HZ * 30);
109 close_ctree(tree_root);
113 static int btrfs_sync_fs(struct super_block *sb, int wait)
115 struct btrfs_trans_handle *trans;
116 struct btrfs_root *root;
122 filemap_flush(root->fs_info->btree_inode->i_mapping);
125 btrfs_clean_old_snapshots(root);
126 mutex_lock(&root->fs_info->fs_mutex);
127 btrfs_defrag_dirty_roots(root->fs_info);
128 trans = btrfs_start_transaction(root, 1);
129 ret = btrfs_commit_transaction(trans, root);
131 mutex_unlock(&root->fs_info->fs_mutex);
135 static void btrfs_write_super(struct super_block *sb)
140 static int btrfs_get_sb(struct file_system_type *fs_type,
141 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
143 return get_sb_bdev(fs_type, flags, dev_name, data,
144 btrfs_fill_super, mnt);
147 static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
149 struct btrfs_root *root = btrfs_sb(dentry->d_sb);
150 struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
152 buf->f_namelen = BTRFS_NAME_LEN;
153 buf->f_blocks = btrfs_super_total_blocks(disk_super);
154 buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
155 buf->f_bavail = buf->f_bfree;
156 buf->f_bsize = dentry->d_sb->s_blocksize;
157 buf->f_type = BTRFS_SUPER_MAGIC;
161 static struct file_system_type btrfs_fs_type = {
162 .owner = THIS_MODULE,
164 .get_sb = btrfs_get_sb,
165 .kill_sb = kill_block_super,
166 .fs_flags = FS_REQUIRES_DEV,
169 static struct super_operations btrfs_super_ops = {
170 .delete_inode = btrfs_delete_inode,
171 .put_super = btrfs_put_super,
172 .read_inode = btrfs_read_locked_inode,
173 .write_super = btrfs_write_super,
174 .sync_fs = btrfs_sync_fs,
175 .write_inode = btrfs_write_inode,
176 .dirty_inode = btrfs_dirty_inode,
177 .alloc_inode = btrfs_alloc_inode,
178 .destroy_inode = btrfs_destroy_inode,
179 .statfs = btrfs_statfs,
182 static int __init init_btrfs_fs(void)
185 btrfs_init_transaction_sys();
186 err = btrfs_init_cachep();
190 return register_filesystem(&btrfs_fs_type);
193 static void __exit exit_btrfs_fs(void)
195 btrfs_exit_transaction_sys();
196 btrfs_destroy_cachep();
198 unregister_filesystem(&btrfs_fs_type);
201 module_init(init_btrfs_fs)
202 module_exit(exit_btrfs_fs)
204 MODULE_LICENSE("GPL");