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Chapter 14 Implementations of File Operations
Copyright © 2008
Introduction
• Layers of the Input-Output Control System • Overview of I/O Organization
• I/O Devices
• Device-Level I/O
• The Physical IOCS • Device Drivers
• Disk Scheduling
Operating Systems, by Dhananjay Dhamdherehamdhere 14.2 2
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Introduction (continued)
• Buffering of Records • Blocking of Records • Access Methods
• Disk and File Caches • Unified Disk Cache
• Case Studies
Operating Systems, by Dhananjay Dhamdherehamdhere 14.3 3
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Layers of the Input-Output Control System
• Input-output control system (IOCS) holds some file data in memory to provide efficient file processing and high device throughput
Operating Systems, by Dhananjay Dhamdherehamdhere 14.4 4
Copyright © 2008
Layers of the Input-Output Control System (continued)
• Two layers:
– Access method layer provides efficient file processing – Physical IOCS layer provides high device throughput
Operating Systems, by Dhananjay Dhamdherehamdhere 14.5 5
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