[PATCH v4 00/18] f2fs: support & optimize large folios for writable files

[Nanzhe Zhao <nzzhao.sigma@gmail.com>]

From: Nanzhe Zhao <zhaonanzhe@xiaomi.com>

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 v4:
- Rebased onto linux-next next-20261012 (4eb2586bd40d); its f2fs part
  is the f2fs dev branch.
- Added "f2fs: read i_size once in f2fs_vm_page_mkwrite" as a
  prerequisite (also sent separately).
- "f2fs: remove mappedtodisk flag usage in mmap write path" is kept as
  a prerequisite.
- Link to v3: [2]

Patches 1 and 2 are prerequisites for the large folio work. They are
also posted independently as bug fixes, and are kept in this series to
make it self-contained for the sashiko review.

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

[1] https://lore.kernel.org/r/20260622160830.324455-1-zhaonanzhe@xiaomi.com
[2] https://lore.kernel.org/linux-f2fs-devel/20261009161224.4163796-1-zhaonanzhe@xiaomi.com/

Nanzhe Zhao (18):
  f2fs: read i_size once in f2fs_vm_page_mkwrite
  f2fs: remove mappedtodisk flag usage in mmap write path
  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: 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                 |    7 +-
 fs/f2fs/data.c                     | 1425 +++++++++++++++++++++++++---
 fs/f2fs/dir.c                      |    2 +-
 fs/f2fs/f2fs.h                     |  173 +++-
 fs/f2fs/file.c                     |  252 +++--
 fs/f2fs/gc.c                       |   38 +-
 fs/f2fs/inline.c                   |    9 +-
 fs/f2fs/inode.c                    |    4 +-
 fs/f2fs/namei.c                    |    1 +
 fs/f2fs/node.c                     |    2 +-
 fs/f2fs/segment.c                  |    3 +-
 13 files changed, 1706 insertions(+), 260 deletions(-)

-- 
2.43.0