What is F2FS?

F2FS is the most commonly used log-structured file system in Linux. It supports flash-friendly features such as adaptive logging, multi-head logging, fsync acceleration, and node address translation. For more information see: https://www.usenix.org/conference/fast15/technical-sessions/presentation/lee

Limitations

• Features under development: mmap(shared), xattr, fallocate

How to test

Fuchsia filesystem tests

• Build configuration for fs-tests (femu runs with f2fs data partition if you add --args=‘data_filesystem_format=“f2fs”’)

$ fx set core.x64 --with-base //src/storage/f2fs:tests

• Run Fuchsia filesystem test suite with f2fs (slow-fs-tests can take more than 5 minutes.)

$ fx test f2fs-fs-tests f2fs-slow-fs-tests

• Only run f2fs unit tests

$ fx test f2fs-unittest

Debian guest based Linux compatibility tests

• Prerequisite

Generate Linux image

$ ./src/virtualization/packages/debian_guest/build-image.sh
prebuilt/virtualization/packages/debian_guest/images/x64 x64

• Build configuration

$ fx set core.x64 --with //src/storage/f2fs:tests

• Run the test

$ fx test f2fs-compatibility-test