驱动如何区分出次设备号。 read/write接口函数要能够获得字符设备结构体变量地址。 什么是文件描述符？ Linux 中一切都可以看作文件，包括普通文件、链接文件、Socket 以及设备驱动等，对其进行相关操作时，都可能会创建对应的文件描述符。文件描述符（file ...

On my linux VMs, this always happens as a copy/delete set of operations, so things that should be instant take a while because of the copy step. It's slow and a lot of unneeded I/O, and super annoying ...