Develop anext2 filesystem driver. (read-only support would be useful as a first step)

• Status: Complete ✔️
• Difficulty: Medium ... Hard
• Language: C
• Mentors:Mike Kinney andBret Barkelew
• Suggested by: rsun3

• Completed ✔️.
• Instead of implementing an ext2 driver as originally proposed, a much more usefulext4 driver was implemented instead!
• Work done by Pedro Falcato (@heatd) as aGSoC2021 Student.

• Before GSoC 2021, some progress was made duringGSOC2011 by Alin Rus
  • Source:https://github.com/GunioRobot/Ext2Pkg
• A newer effort has been started based on GRUB filesystem drivers, however this code cannot be merged to TianoCore due to GRUB being licensed under the GPL.
  • https://github.com/pbatard/efifs/tree/master/

Filesystems in UEFI can be accessed through the SimpleFileSystem protocol. This protocol is the defined withinSimpleFileSystem.h.

This project should be completed with a BSD compatible solution.This would mean that GPL licenses ext2 code or header files cannot be used.You would need to investigate ext2's disk format by looking for documentation,consulting with ext2(+) developers, or (as a last resort) by examining the disk contents.

It may be possible to leverage BSD compatible code from areputable open source project, but using 3rd-party code does addsome extra complexity (seeCode Contributions).

Building: This project can be completed on any edk2 supported OS or toolchain.

Testing:OVMF would probably provide the easiest environment for testing your project. You should be able to build your driver into OVMF and then run OVMF with a hard disk image that contains an ext2 file-system.

This project would be for an edk2 based driver, so please discuss the project onedk2-devel.

• Tasks
• GSOC2011#Read-only ext2 driver