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- /*
- * 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->super_copy;
- 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");
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