[PATCH v3 0/6] mm, swap: clean up swap cache mapping helper

[Kairui Song <ryncsn@gmail.com>]

From: Kairui Song <kasong@tencent.com>

This series removes usage of folio_index usage in fs/, and remove swap
cache checking in folio_contains.

Currently, the swap cache is already no longer directly exposed to fs,
and swap cache will be more different from page cache. Clean up the
helpers first to simplify the code and eliminate the helpers used for
resolving circular header dependency issue between filemap and swap
headers, and prepare for further changes.

---

V1: https://lore.kernel.org/linux-mm/20250427185908.90450-1-ryncsn@gmail.com/
Changes:
- Collect Reviewed-by.
- Fix a build bot error.
- Slightly update commit messages to cover a few review concerns.

V2: https://lore.kernel.org/linux-mm/20250429114949.41124-1-ryncsn@gmail.com/
Changes:
- Collect Acked-by.
- VM_BUG_ON to VM_WARN_ON and minor code style update.

Kairui Song (6):
  fuse: drop usage of folio_index
  btrfs: drop usage of folio_index
  f2fs: drop usage of folio_index
  filemap: do not use folio_contains for swap cache folios
  mm: move folio_index to mm/swap.h and remove no longer needed helper
  mm, swap: remove no longer used swap mapping helper

 fs/btrfs/extent_io.c    |  2 +-
 fs/f2fs/data.c          |  4 ++--
 fs/f2fs/inline.c        |  4 ++--
 fs/f2fs/super.c         |  2 +-
 fs/fuse/file.c          |  4 ++--
 include/linux/pagemap.h | 29 ++++-------------------------
 mm/gup.c                |  1 +
 mm/memfd.c              |  1 +
 mm/migrate.c            |  1 +
 mm/page-writeback.c     |  1 +
 mm/swap.h               | 18 ++++++++++++++++++
 mm/swapfile.c           | 15 ---------------
 12 files changed, 34 insertions(+), 48 deletions(-)

-- 
2.49.0