CS 3733 Operating Systems

Reading: SG 10.1-10.3 and PUP 3.3

• Filesystem
  • Files - different organizations and their implications
  • Directories - organization and structure. Links versus symbolic links.
  • Partitions

• File Attributes
  • Name
  • Type
  • Location
  • Size
  • Protection
  • Time and dates of creation, modification and access
  • User identification

• File Operations
  • Create (open)
  • Write (write)
  • Read (read)
  • Reposition (lseek)
  • Delete (unlink)
  • Truncation (open)

• Information kept in system file table:
  • file pointer
  • file open count
  • disk location

• File types: NT and Windows 95 are patterned after the MAC so each file has a type and a creator attribute.

• File structure: Unix assumes each file is a stream of bytes while MAC allows additional information to be incoded.

• Directory implementations: flat versus tree structured.

• Directory implementation in Unix

SKILL: Understand the basic issues of file system implementation.