Review of Virtual Memory and a Look at File Systems

Virtual Memory Review

We did a review of virtual memory in class.

File systems

We began a look at file systems.  An OS must keep track of

• the names of files
• where files are on a disk
• the tree structure of a file system
• various parameters of the files, such as creation date, last modified date, and so forth

If a system is a multi user system like Linux, the OS must also maintain for each file

• the owner of the file
• permissions for others to read, write, and/or execute the file