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File System Management

File System Management. Abbas al Ali 441 Murtadha al Nasser 499 Mohammed al Dokhi 468 Ali Khuder 448 Ammar 463. Introduction. A files is a logical collection. A file system is collection of file.

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File System Management

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  1. File System Management Abbas al Ali 441 Murtadha al Nasser 499 Mohammed al Dokhi 468 Ali Khuder 448 Ammar 463

  2. Introduction • A files is a logical collection. • A file system is collection of file. • A file system may also include of a variety other objects that share many of properties of files (such as 1/0) devices.

  3. Directories and name • A directory or folder is a file system object that contains other file system objects. Actually, a directory is an object that contains the name of file system objects.

  4. Partitions • System partitions and boot partitions are names for partitions or volumes on a hard disk that Windows uses when starting. These technical terms are only important if you have more than one operating system installed on your computer (often called a dual-boot or multi boot configuration).

  5. Directory Structure • A collection of nodes containing information • about all files

  6. File Types • Data • Text, binary,… • Program • Regular files – stores information • Directory – stores information about file(s) • Device files – representsdifferentdevices

  7. File Operations Create • Write • Read • Reposition within file – file seek • Delete • Truncate • Open(Fi) – search the directory structure on disk for entry Fi, and move the content of entry to memory • Close (Fi) – move the content of entry Fi in memory to directory structure on disk

  8. Access Methods • Sequential Access • read next • write next • reset • Direct Access • read n • write n • position to n • read next • write next • n = relative block number

  9. Free-Space Management • Bit vector (n blocks) • Block number calculation for first free block (number of bits per word) * (number of 0-value words) + offset of first 1 bit

  10. Summary • Directories and name. • Partitions. • Directory Structure • File Types • File Operations • Access Methods • Free-Space Management

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