copy _ from_user函数将数据块从用户空间复制到内核缓冲区。
The copy_from_user function copies a block of data from user space into a kernel buffer.
copy _ to_user函数将数据块从内核复制到用户空间。
The copy_to_user function copies a block of data from the kernel into user space.
缓冲区缓存——为存储从物理数据文件读取的数据块而分配的内存。
Buffer Cache - Memory allocated for storing data blocks read from physical data files.
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