[RFC PATCH 0/2] f2fs: support uncached buffered I/O

[Wenjie Qi]

This RFC series enables buffered RWF_DONTCACHE on F2FS.

The first patch keeps dropbehind folios in dropbehind-only write bios and
defers their completion to task context when completion happens outside
in_task().

The second patch then exposes FOP_DONTCACHE and propagates
IOCB_DONTCACHE to write_begin folio allocation so buffered
RWF_DONTCACHE can reach the F2FS write path.

The split keeps the write-side semantics in place before enabling the
user-visible API.

Wenjie Qi (2):
  f2fs: keep dropbehind write bios task-context safe
  f2fs: enable buffered RWF_DONTCACHE

 fs/f2fs/data.c | 63 +++++++++++++++++++++++++++++++++++++++-----------
 fs/f2fs/file.c |  2 +-
 2 files changed, 51 insertions(+), 14 deletions(-)

-- 
2.43.0