This document discusses file systems, virtualization techniques, and permissions. It describes different types of file systems like ext, FAT32, NTFS, and Brtfs. It also outlines several virtualization methods like full virtualization, para-virtualization, and hardware-assisted virtualization. Further, it explains ring-based permission structures and how virtualization handles memory, devices, I/O through techniques like emulating a virtual MMU and virtualizing components like Ethernet and USB.

1. Virtualization & File System
By Nikhileshkumar Ikhar

2. File System
• Abstraction of H/W
• Different kinds of FS
– ext
– FAT32, NTFS
– Brtfs
– Hadoop, Samba

3. Virtualization [1]
• With OS assistance
• Without OS assistance
– Hypervisor

4. Virtualization
• Full Virtualization
– Guest OS doesn’t know about virtualization
– Binary translation, simulation/emulation
• Para Virtualization
– Guest OS is modified for virtualization
• H/w Assisted Virtualization
– Hypervisor assist in virtualization
– IntelVT and AMD-V

5. Permission [2]
• Ring Structure
– open in UserSpace User Space
3
– sys_open in Kernel
2
1
0 OS

6. Virtualization
• Memory Virtualization
– Real MMU for Virtual MMU
• Device and I/O Virtualization
– Ethernet, Sound Card, USB, NIC
– KeyBoard, Mouse, Comm port
– etc

7. Internet Links
1. http://www.vmware.com/files/pdf/VMware_
paravirtualization.pdf
2. http://en.wikipedia.org/wiki/Ring_(computer
_security)

8. Thank You