[PATCH v3 00/17] f2fs: support & optimize large folios for writable files

[Nanzhe Zhao]

This series supports large folios for most readable/writable files
in buffered I/O paths, including normal files, block-layer encrypted
files, and atomic files except for inline-data files, compressed files,
and quota files.

It also extends f2fs_folio_state to coexist with f2fs page-private
flags and to handle large folio write path and partial truncate of
large folios correctly.

Benchmark details can be found in the RFC v2 cover letter [1].

Changes in v3:
- Addressed the remaining review comments from Chao and Daeho; the
  fixes are folded into the corresponding patches.
- Added "f2fs: account large folio dirty data at block granularity" to
  fix the f2fs/006 and generic/363 regressions.
- Added "f2fs: wait for folio writeback before ffs_detach_free", fixing
  a use-after-free in the full-range invalidation path reported by the
  kernel test robot [2].
- "f2fs: remove mappedtodisk flag usage in mmap write path" is now
  included in the series as a prerequisite.
- Link to v2: [3]

Many thanks to Chao and Daeho for your extensive reviews and valuable
suggestions!

[1] https://lore.kernel.org/r/20260622160830.324455-1-zhaonanzhe@xxxxxxxxxx
[2] https://lore.kernel.org/linux-f2fs-devel/202610081027.b13dcf10-lkp@xxxxxxxxx/
[3] https://lore.kernel.org/r/20260915041909.2903887-1-zhaonanzhe@xxxxxxxxxx

Nanzhe Zhao (17):
  f2fs: extend folio state for large folio write path
  f2fs: carry subpage offset and count in write IO
  f2fs: support regular file buffered writes on large folios
  f2fs: support atomic file large folios buffered write
  f2fs: support large folio writeback
  f2fs: account large folio dirty data at block granularity
  f2fs: remove mappedtodisk flag usage in mmap write path
  f2fs: prepare mmap write faults for large folios
  f2fs: make GC migration large-folio aware
  f2fs: optimize small block size large folio read
  f2fs: support partial uptodate large folio read
  f2fs: handle partial truncate of large folio dirty subpages
  f2fs: wait for folio writeback before ffs_detach_free
  f2fs: fix zeroing paths for large folios
  f2fs: handle block cloning within the same large folio
  f2fs: allow large folio support to writeable files
  f2fs: make compressed files compatible with large folio

 Documentation/filesystems/f2fs.rst |   10 +
 fs/f2fs/checkpoint.c               |   40 +-
 fs/f2fs/compress.c                 |    3 +
 fs/f2fs/data.c                     | 1333 +++++++++++++++++++++++++---
 fs/f2fs/f2fs.h                     |  170 +++-
 fs/f2fs/file.c                     |  230 +++--
 fs/f2fs/gc.c                       |   38 +-
 fs/f2fs/inline.c                   |    7 +
 fs/f2fs/inode.c                    |    4 +-
 fs/f2fs/namei.c                    |    1 +
 fs/f2fs/segment.c                  |    5 +-
 11 files changed, 1588 insertions(+), 253 deletions(-)

-- 
2.43.0