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EXT2文件系统, VFS, 用户 (写（write）, 读（read）) - Coggle Diagram

- - - - ext2_get_blocks
        
        ext2_block_to_path
        
        获取所需的索引深度、每层索引偏移
        
        ext2_get_branch
        
        构造具体分配信息chain
        
        ext2_find_goal
        
        寻找磁盘最佳分配位置
        
        ext2_blks_to_allocate
        
        记录分配的块数
        
        ext2_alloc_branch
        
        1 more item...
- - - - address_space_operations
    - - read/read_iter
      - write/write_iter
- - - - vfs_write
    - - vfs_read