[PATCH v2 0/4] fuse: clean up offset and page count calculations

[Joanne Koong <joannelkoong@gmail.com>]

This patchset aims to simplify the folio parsing logic in fuse_notify_store()
and fuse_retrieve() and use standard kernel helper macros for common
calculations:
 * offset_in_folio() for large folio offset calculations
 * DIV_ROUND_UP() for page count calculations
 * offset_in_page() for page offset calculations

The 1st patch (outarg offset and size validation) is needed for the 2nd patch
(simplify logic in fuse_notify_store()/fuse_retrieve()) in order to use
"loff_t pos" for file position tracking.

No functional changes intended.

This patchset is on top of Jingbo's patch in [1].

Thanks,
Joanne

[1] https://lore.kernel.org/linux-fsdevel/20260115023607.77349-1-jefflexu@linux.alibaba.com/

Changelog
---------
v1: https://lore.kernel.org/linux-fsdevel/20260116235606.2205801-1-joannelkoong@gmail.com/
v1 -> v2:
* Replace offset_in_folio() patch with patch that restructures
  fuse_notify_store() and fuse_retrieve() logic (Jingbo)
* Add outarg validation patch (patch 1)

Joanne Koong (4):
  fuse: validate outarg offset and size in notify store/retrieve
  fuse: simplify logic in fuse_notify_store() and fuse_retrieve()
  fuse: use DIV_ROUND_UP() for page count calculations
  fuse: use offset_in_page() for page offset calculations

 fs/fuse/dev.c     | 52 +++++++++++++++++++++++------------------------
 fs/fuse/file.c    |  2 +-
 fs/fuse/readdir.c |  8 ++++----
 3 files changed, 30 insertions(+), 32 deletions(-)

-- 
2.47.3