Google Git
Sign in
fuchsia / third_party / f2fs / b8d10a53549d2ba01904d08b4cf9a489d06c6ca2
commitb8d10a53549d2ba01904d08b4cf9a489d06c6ca2[log] [tgz]
authorJaeyoon Choi <j_yoon.choi@samsung.com>Wed Jun 23 20:50:35 2021 +0900
committerBrett Wilson <brettw@google.com>Fri Jun 25 16:24:06 2021 +0000
tree2394ec0871f1dd5d8425a57f89a0f1393ebaec99
parentcb65ef06fb73bf325ece3bab8f3273757af90fbe [diff]
[f2fs] Add a unit test and correction regarding the NAT bitmap

This unittest checks the validity of kNatBitmap that
a checkpoint pack includes to indicate valid NAT blocks among two NAT area.

This change also corrects the NAT flushing to use only NAT areas
but not journal area when the number of the dirty NAT entries exceeds the journal area.

Test: fx test f2fs-unittest fs-tests large-fs-tests

Change-Id: I3e33b046f8f41b04508feb6098068b752e4185ab
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/f2fs/+/548261
Reviewed-by: Brett Wilson <brettw@google.com>
2 files changed
tree: 2394ec0871f1dd5d8425a57f89a0f1393ebaec99
  1. patches/
  2. test/
  3. test_files/
  4. third_party/
  5. tools/
  6. AUTHORS
  7. bcache.cc
  8. bcache.h
  9. BUILD.gn
  10. checkpoint.cc
  11. CONTRIBUTING.md
  12. data.cc
  13. dir.cc
  14. dir.h
  15. dir_hash.cc
  16. f2fs.cc
  17. f2fs.h
  18. f2fs_internal.h
  19. f2fs_layout.h
  20. f2fs_lib.h
  21. f2fs_types.h
  22. file.cc
  23. file.h
  24. fsck.cc
  25. fsck.h
  26. gc.cc
  27. LICENSE
  28. mkfs.cc
  29. mkfs.h
  30. mount.cc
  31. mount.h
  32. namei.cc
  33. namestring.h
  34. node.cc
  35. node.h
  36. PATENTS
  37. README.md
  38. recovery.cc
  39. segment.cc
  40. segment.h
  41. super.cc
  42. vnode.cc
  43. 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
  • Fuchsia base code ; Thu May 20 07:25:45 2021 Yilong Li, 02c0dfff0fdb
  • 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 core.x64 --with-base //bundles:tools --with-base //bundles:tests --with-base third_party/f2fs $ fx emu -N --headless (see third_party/f2fs/test_files/README.md for test)