| Application |
Syscall interface: create, open, read, write, ….. . |
| File descriptor table |
Table of unique identifiers (handles) for open files for a given process. |
| Open file table |
Global table of open files (vnodes). |
| Virtual file system |
Unified interface for multiple file systems. |
| File system |
Hides physical location of data on disk. Exposes directory hierarchy, symbolic file names, random access files, protection. |
| Buffer cache |
Keep recently accessed disk blocks in memory. |
| Disk scheduler |
Schedule disk accesses from multiple processes for performance and fairness. |
| Device driver |
Hides device-specific protocol. Exposes block-device interface (linear sequence of blocks). |
| Disk controller |
Hides disk geometry and exposes a linear sequence of blocks. |
| Hard disk platters |
Contains tracks and sectors. Not too relevant for this course. |