模拟二级文件系统的代码

以下是使用Python语言实现模拟二级文件系统的代码示例：

import time

class Inode:
    def __init__(self, node_type):
        self.node_type = node_type
        self.access_permission = 'rwx'
        self.create_time = time.time()
        self.modify_time = time.time()
        self.file_size = 0
        self.data_block = []

class Directory(Inode):
    def __init__(self):
        super().__init__('directory')
        self.files = {}

    def add_file(self, file_name, inode):
        self.files[file_name] = inode

    def remove_file(self, file_name):
        del self.files[file_name]

class File(Inode):
    def __init__(self):
        super().__init__('file')

class FileSystem:
    def __init__(self):
        self.inode_pool = {}
        self.root_dir = Directory()

    def allocate_inode(self, node_type):
        inode = Inode(node_type)
        self.inode_pool[id(inode)] = inode
        return inode

    def create_file(self, file_name):
        inode = self.allocate_inode('file')
        file = File()
        self.root_dir.add_file(file_name, id(inode))
        return inode

    def create_dir(self, dir_name):
        inode = self.allocate_inode('directory')
        dir = Directory()
        self.root_dir.add_file(dir_name, id(inode))
        return inode

    def read_file(self, file_inode):
        file = self.inode_pool[file_inode]
        data = ''
        for block in file.data_block:
            data += block
        return data

    def write_file(self, file_inode, data):
        file = self.inode_pool[file_inode]
        file.data_block.append(data)
        file.file_size += len(data)
        file.modify_time = time.time()

    def remove_file(self, file_name):
        inode = self.root_dir.files[file_name]
        file = self.inode_pool[inode]
        del self.inode_pool[inode]
        self.root_dir.remove_file(file_name)

    def move_dir(self, dir_name, new_dir_name):
        inode = self.root_dir.files[dir_name]
        self.root_dir.remove_file(dir_name)
        self.root_dir.add_file(new_dir_name, inode)

    def rename_dir(self, dir_name, new_dir_name):
        inode = self.root_dir.files[dir_name]
        self.root_dir.remove_file(dir_name)
        self.root_dir.add_file(new_dir_name, inode)

以上代码演示了如何定义inode节点、目录结构，并实现了文件和目录的创建、读写、删除、移动和重命名等操作。