CSC 225 Operating System II: File System Interface
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Questions and Answers

What is the maximum file size that can be stored on exFAT file system?

  • 4 gigabytes
  • 2 gigabytes
  • 16 terabytes
  • 512 terabytes (correct)

    • Which file system is mostly used for mobile data media with a maximum size of 4 gigabytes?

  • FAT16 (correct)
  • NTFS
  • FAT12
  • FAT32

    • What is the file system that stands for New Technology File System and was designed in 1993 by Microsoft for Windows NT?

  • NTFS (correct)
  • FAT32
  • exFAT
  • FAT

    • What is the maximum file size that can be stored on NTFS file system?

    <p>16 terabytes</p> Signup and view all the answers

    What is the oldest system in the family of FAT file systems?

    <p>FAT12</p> Signup and view all the answers

    When was the exFAT file system produced especially for flash memory?

    <p>2006</p> Signup and view all the answers

    What type of file attribute provides information about the file's protection?

    <p>Protection</p> Signup and view all the answers

    What is the primary function of the open-file table?

    <p>To track open files</p> Signup and view all the answers

    What is the difference between sequential access and direct access?

    <p>Sequential access is slower, direct access is faster</p> Signup and view all the answers

    What is the purpose of an index in a file system?

    <p>To allow for faster access to specific records in a file</p> Signup and view all the answers

    What is the term for a file system that is built on top of a basic file system?

    <p>Special-purpose file system</p> Signup and view all the answers

    What is the term for a collection of nodes containing information about all files?

    <p>Directory structure</p> Signup and view all the answers

    What is the purpose of a file lock?

    <p>To manage concurrent access to a file</p> Signup and view all the answers

    What is the term for a file system that allows files to be accessed in a specific order?

    <p>Sequential file system</p> Signup and view all the answers

    What is the term for a file system that uses a combination of hardware and software to provide high availability?

    <p>RAID file system</p> Signup and view all the answers

    What is the term for a file system that is used for temporary files?

    <p>tmpfs file system</p> Signup and view all the answers

    What is a key consideration when designing a file system that allows links to files?

    <p>Preventing cycles in the directory structure</p> Signup and view all the answers

    What is the primary purpose of mounting a file system?

    <p>To allow users to access a file system</p> Signup and view all the answers

    In a multi-user system, what is used to identify users and assign permissions?

    <p>User IDs and Group IDs</p> Signup and view all the answers

    What is the primary benefit of using a distributed file system like NFS?

    <p>Simplified file sharing across a network</p> Signup and view all the answers

    What is a common failure mode in remote file systems?

    <p>Corruption of directory structures or metadata</p> Signup and view all the answers

    What is the primary purpose of consistency semantics in file sharing?

    <p>To specify how multiple users access a shared file</p> Signup and view all the answers

    What is the primary purpose of access control lists in Unix?

    <p>To manage file permissions</p> Signup and view all the answers

    What is a key consideration when designing a file system that allows file sharing?

    <p>Specifying access control lists</p> Signup and view all the answers

    What is the primary purpose of the current directory in a file system?

    <p>To specify the location of file operations</p> Signup and view all the answers

    What is a key benefit of using a distributed file system like AFS?

    <p>Complex remote file sharing semantics</p> Signup and view all the answers

    Study Notes

    File System Interface

    • A file concept is a contiguous logical address space, which can be classified into two types: data and program files.
      • Data files can be numeric, character, or binary.
      • Program files can be text, source, or executable.

    File Attributes

    • File attributes are stored in the directory structure on disk and include:
      • Name: the only information kept in human-readable form.
      • Identifier: a unique tag (number) that identifies the file within the file system.
      • Type: needed for systems that support different file types.
      • Location: a pointer to the file location on the device.
      • Size: the current file size.
      • Protection: controls who can read, write, execute, and access the file.
      • Time, date, and user identification: data for protection, security, and usage monitoring.

    Directory Structure

    • A directory structure is a collection of nodes containing information about all files.
    • Both the directory structure and files reside on disk.

    File Operations

    • File operations include:
      • Create
      • Write
      • Read
      • Reposition within a file (seek)
      • Delete
      • Truncate
      • Open
      • Close

    Open Files

    • Several pieces of data are needed to manage open files, including:
      • Open-file table: tracks open files.
      • File pointer: a pointer to the last read/write location, per process that has the file open.
      • File-open count: a counter of the number of times a file is open.
      • Disk location of the file: a cache of data access information.
      • Access rights: per-process access mode information.

    File Locking

    • File locking is provided by some operating systems and file systems.
    • File locking mediate access to a file and can be mandatory or advisory.
    • Examples of file locking include reader-writer locks.

    File Types and Structure

    • File types can be classified based on their structure, including:
      • Simple record structure
      • Complex structures (formatted document, relocatable load file)
    • File structure can be simulated using control characters.

    Access Methods

    • Access methods include:
      • Sequential access
      • Direct access
      • Other access methods (indexing, hashing)

    Sequential Access

    • Sequential access operations include:
      • Read next
      • Write next
      • Reset
      • No read after last write (rewrite)

    Direct Access

    • Direct access operations include:
      • Read n
      • Write n
      • Position to n

    File System Organization

    • A file system is organized into partitions, which can be further subdivided into volumes.
    • Each volume contains a file system, and the file system information is tracked in a device directory or volume table of contents.

    File System Types

    • There are many types of file systems, including:
      • General-purpose file systems (ufs, zfs)
      • Special-purpose file systems (tmpfs, objfs, ctfs, lofs, procfs)

    File Sharing and Mounting

    • File sharing allows multiple users to access files on a multi-user system.
    • File systems must be mounted before they can be accessed.
    • File sharing can be done through protection schemes, network file systems, or remote file systems.

    Protection

    • File protection involves controlling access to files, including:
      • Read
      • Write
      • Execute
      • Append
      • Delete
      • List

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    Description

    This quiz covers the concepts of file system interface, including file concept, access methods, and disk organization, as discussed in Chapter 2 of the Operating System II course.

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