200 lines
4.9 KiB
C
200 lines
4.9 KiB
C
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/time.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/mpage.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/statfs.h>
|
|
#include <linux/compat.h>
|
|
#include "ctree.h"
|
|
#include "disk-io.h"
|
|
#include "transaction.h"
|
|
#include "btrfs_inode.h"
|
|
#include "ioctl.h"
|
|
#include "print-tree.h"
|
|
|
|
#define BTRFS_SUPER_MAGIC 0x9123682E
|
|
|
|
static struct super_operations btrfs_super_ops;
|
|
|
|
static void btrfs_put_super (struct super_block * sb)
|
|
{
|
|
struct btrfs_root *root = btrfs_sb(sb);
|
|
int ret;
|
|
|
|
ret = close_ctree(root);
|
|
if (ret) {
|
|
printk("close ctree returns %d\n", ret);
|
|
}
|
|
sb->s_fs_info = NULL;
|
|
}
|
|
|
|
static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
|
|
{
|
|
struct inode * inode;
|
|
struct dentry * root_dentry;
|
|
struct btrfs_super_block *disk_super;
|
|
struct btrfs_root *tree_root;
|
|
struct btrfs_inode *bi;
|
|
int err;
|
|
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_magic = BTRFS_SUPER_MAGIC;
|
|
sb->s_op = &btrfs_super_ops;
|
|
sb->s_time_gran = 1;
|
|
|
|
tree_root = open_ctree(sb);
|
|
|
|
if (!tree_root || IS_ERR(tree_root)) {
|
|
printk("btrfs: open_ctree failed\n");
|
|
return -EIO;
|
|
}
|
|
sb->s_fs_info = tree_root;
|
|
disk_super = tree_root->fs_info->disk_super;
|
|
inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
|
|
tree_root);
|
|
bi = BTRFS_I(inode);
|
|
bi->location.objectid = inode->i_ino;
|
|
bi->location.offset = 0;
|
|
bi->location.flags = 0;
|
|
bi->root = tree_root;
|
|
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
|
|
|
|
if (!inode) {
|
|
err = -ENOMEM;
|
|
goto fail_close;
|
|
}
|
|
if (inode->i_state & I_NEW) {
|
|
btrfs_read_locked_inode(inode);
|
|
unlock_new_inode(inode);
|
|
}
|
|
|
|
root_dentry = d_alloc_root(inode);
|
|
if (!root_dentry) {
|
|
iput(inode);
|
|
err = -ENOMEM;
|
|
goto fail_close;
|
|
}
|
|
sb->s_root = root_dentry;
|
|
btrfs_transaction_queue_work(tree_root, HZ * 30);
|
|
return 0;
|
|
|
|
fail_close:
|
|
close_ctree(tree_root);
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root;
|
|
int ret;
|
|
root = btrfs_sb(sb);
|
|
|
|
sb->s_dirt = 0;
|
|
if (!wait) {
|
|
filemap_flush(root->fs_info->btree_inode->i_mapping);
|
|
return 0;
|
|
}
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
sb->s_dirt = 0;
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_write_super(struct super_block *sb)
|
|
{
|
|
sb->s_dirt = 0;
|
|
}
|
|
|
|
static int btrfs_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data,
|
|
btrfs_fill_super, mnt);
|
|
}
|
|
|
|
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
|
|
struct btrfs_super_block *disk_super = root->fs_info->disk_super;
|
|
|
|
buf->f_namelen = BTRFS_NAME_LEN;
|
|
buf->f_blocks = btrfs_super_total_blocks(disk_super);
|
|
buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
|
|
buf->f_bavail = buf->f_bfree;
|
|
buf->f_bsize = dentry->d_sb->s_blocksize;
|
|
buf->f_type = BTRFS_SUPER_MAGIC;
|
|
return 0;
|
|
}
|
|
|
|
static struct file_system_type btrfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "btrfs",
|
|
.get_sb = btrfs_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static struct super_operations btrfs_super_ops = {
|
|
.delete_inode = btrfs_delete_inode,
|
|
.put_super = btrfs_put_super,
|
|
.read_inode = btrfs_read_locked_inode,
|
|
.write_super = btrfs_write_super,
|
|
.sync_fs = btrfs_sync_fs,
|
|
.write_inode = btrfs_write_inode,
|
|
.dirty_inode = btrfs_dirty_inode,
|
|
.alloc_inode = btrfs_alloc_inode,
|
|
.destroy_inode = btrfs_destroy_inode,
|
|
.statfs = btrfs_statfs,
|
|
};
|
|
|
|
static int __init init_btrfs_fs(void)
|
|
{
|
|
int err;
|
|
btrfs_init_transaction_sys();
|
|
err = btrfs_init_cachep();
|
|
if (err)
|
|
return err;
|
|
return register_filesystem(&btrfs_fs_type);
|
|
}
|
|
|
|
static void __exit exit_btrfs_fs(void)
|
|
{
|
|
btrfs_exit_transaction_sys();
|
|
btrfs_destroy_cachep();
|
|
unregister_filesystem(&btrfs_fs_type);
|
|
}
|
|
|
|
module_init(init_btrfs_fs)
|
|
module_exit(exit_btrfs_fs)
|
|
|
|
MODULE_LICENSE("GPL");
|