bfs_find_entry
bh = bfs_find_entry(dir, &dentry->d_name, &de);
bh = bfs_find_entry(dir, &dentry->d_name, &de);
old_bh = bfs_find_entry(old_dir, &old_dentry->d_name, &old_de);
new_bh = bfs_find_entry(new_dir, &new_dentry->d_name, &new_de);
static struct buffer_head *bfs_find_entry(struct inode *dir,