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fuchsia / third_party / f2fs / 09933c2ec9363d7a363fd2b76bf09fffd87f8213
commit09933c2ec9363d7a363fd2b76bf09fffd87f8213[log] [tgz]
authorJaeyoon Choi <j_yoon.choi@samsung.com>Mon May 03 10:42:01 2021 +0900
committerBrett Wilson <brettw@google.com>Tue May 18 18:02:36 2021 +0000
tree11da45b3d3bc9e8f09e93df1aeb975a2442712d5
parentbbfcac61f13ec379b7083604093ee5e8dd34a190 [diff]
[f2fs] code refectoring: segment.h

  Change struct name to C++ style name (segment.h)
  (comment: #84 https://fuchsia-review.googlesource.com/c/third_party/f2fs/+/511841)

  Change struct xxx to xxx (segment.h)
  (comment: #312 https://fuchsia-review.googlesource.com/c/third_party/f2fs/+/520881/2)

  Remove __ prefix (segment.h)

Change-Id: I0fda48ae82ce2b3da48d2ff001c29b37339080b4
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/f2fs/+/531064
Reviewed-by: Brett Wilson <brettw@google.com>
10 files changed
tree: 11da45b3d3bc9e8f09e93df1aeb975a2442712d5
  1. test_files/
  2. third_party/
  3. tools/
  4. AUTHORS
  5. bcache.cc
  6. bcache.h
  7. BUILD.gn
  8. checkpoint.cc
  9. CONTRIBUTING.md
  10. data.cc
  11. dir.cc
  12. dir.h
  13. dir_hash.cc
  14. f2fs.cc
  15. f2fs.h
  16. f2fs_internal.h
  17. f2fs_layout.h
  18. f2fs_lib.h
  19. f2fs_types.h
  20. file.cc
  21. file.h
  22. LICENSE
  23. mkfs.cc
  24. mkfs.h
  25. namei.cc
  26. node.cc
  27. node.h
  28. PATENTS
  29. README.md
  30. recovery.cc
  31. segment.cc
  32. segment.h
  33. super.cc
  34. vnode.cc
  35. vnode.h
README.md

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

Major Release

1st release (Apr-06-2021)

  • Features: mkfs, mount/umount, read, write, rmdir, mkdir, rename, fsync, lseek, link, unlink
  • Remarks
  • Fuchsia base code ; Thu Mar 11 08:53:24 2021 Prashanth Swaminathan,76a08ad1474 [speak] Migrate to new component templates
  • There is no cache. Every request is handled as a synchronous operation.
  • fsync() triggers checkpointing
  • lock granularity: file operation
  • LFS is used for block allocation by default, and IPU is forced when the number of free sections is below 50%.
  • no background/foreground gc
  • disable the roll-forward recovery
  • 6 active logs
  • disable the ext-identify feature
  • block allocation: LFS, IPU
  • fsck do nothing, but it returns true
  • no discard

2nd release (May-28-2021)

  • Features: truncate, ssr, fsync, recovery
  • Remarks
  • support the roll-forward recovery and file level fsync()
  • block allocation: LFS, IPU, SSR
  • truncate

3rd release (June-25-2021)

  • Features: fsck, mount option, mkfs option
  • Remarts
  • fsck (base: bbf6e62)
  • support the ext-identify feature
  • support discard

4th release (July-30-2021 ~)

  • Testability
  • Features: buffered IO, gc (if writable PagedVfs is available)
  • Remarks
  • background/foreground gc
  • caching node/meta blocks
  • read ahead
  • Page level locking
  • buffered IO
  • mmap
  • IPU can be disabled.
  • support fvm
  • xattr

How to build

$ fx set bringup.x64 --with //bundles:tools --with-base //bundles/buildbot:bringup --with-base third_party/f2fs --with-base third_party/f2fs/tools:f2fs-tools $ fx build $ fx emu -N --headless -hda third_party/f2fs/test_files/blk{500m or 1g}.bin (see third_party/f2fs/test_files/README.md for test)