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Chapter 10: File System Interface

Created: 2025-12-16

Updated: 2025-12-16

file: a logical storage unit
platter/track/sector: physical storage unit in disk
file attributes(metadata): name, type, location, size, protection, time/date...
file operations: create, write, read, reposition, delete, truncate...
Open-File Table
- per-process open-file table
  - pointer to system-wide open-file table
  - program-wise info: file pointer, access mode (read, write, append)...
- system-wide open-file table
  - file-wise info: disk location, file open count...
file types (.exe .txt ...): Hint for OS to operate it reasonably

Access Methods

Sequential Access: read/write data in a linear way
- read/write next record
- reset: back to the beginning of the file
- rewind: go back n records

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