lO Requests to Hardware Operations Q请求到 Consider reading a file from disk for a process (考虑一个进程从磁盘中读取一个文件) Determine device holding file(决定保存文件的设备 Translate name to device representation (转换名字到设备使用的表示法) Physically read data from disk into buffer (把数据从磁盘读到缓冲区中) Make data available to requesting process (通知进程数据现在是有效的) Return control to process (把控制权返回给进程) Applied Operating System Concepts 12.17 Silberschatz, Galvin, and Gagne @199912.17 Silberschatz, Galvin, and Gagne ©1999 Applied Operating System Concepts I/O Requests to Hardware Operations I/O请求到硬件操作 • Consider reading a file from disk for a process （考虑一个进程从磁盘中读取一个文件） – Determine device holding file （决定保存文件的设备） – Translate name to device representation （转换名字到设备使用的表示法） – Physically read data from disk into buffer （把数据从磁盘读到缓冲区中） – Make data available to requesting process （通知进程数据现在是有效的） – Return control to process （把控制权返回给进程）