1. File system mounting, sharing, protection
11.5. File Sharing
Multiple Users
Owner Group approach
UID in Unix, SID in Windows
11.6. Protection
Types of access
Silberschatz, 6th ed. Chapters 11.

2. File System Mounting mount point Mounted file system New file system
This is not lost

3. File sharing In a multiuser environment the operating system
either can allow a user to access the files of other users by default
or it may require that a user specifically grant access to the files.

4. Protection

5. Owner Group Universe approach

6. Owner Group Universe approach

7. UID in Unix, SID in Windows

8. UID in Unix, SID in Windows

9. Process Effective Permissions