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Chapter 11 - File System (File system operations (Remote file systems…

- - - - Data
        
        numeric
        
        character
        
        Binary
      - program
  - - - only information kept in human-readable form
    - - unique tag (number) identifies file within file system
    - - needed for systems that support different types
    - - pointer to file location on device
    - - current file size
    - - controls who can do reading, writing, executing
    - - data for protection, security and usage monitoring
  - - - Open file table
        
        tracks open files
      - File open count
        
        counter of number of times a file is open
    - - Shared lock
        
        similar to reader lock
      - exclusive lock
        
        similar to writer lock
- - - - tmpfs
        
        memory-based volatile FS for fast, temporary I/O
      - objfs
        
        interface into kernel memory to get kernel symbols for debugging
      - ctfs
        
        contract file system for managing daemons
      - lofs
        
        loopback file system allows one FS to be accessed in place of another
      - procfs
        
        kernel interface to process structures
      - ufs, zfs
        
        general purpose file systems
  - - - efficiency
        
        convenient to users
      - naming
        
        convenient to users
      - Grouping
        
        logical grouping of file by properties
  - - - single directory for all users
      - naming problem
      - grouping problem
    - - separate directory for each user
      - can have the same file name for different user
      - no grouping capability
    - - efficient searching
      - grouping capability
      - current directory
    - - have shared subdirectories and files
      - two different names (aliasing)