[PATCH v2 0/1] fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()

[Joanne Koong <joannelkoong@gmail.com>]

This patch reverts fuse back to its original behavior of sync being a no-op.

This fixes the userspace regression reported by Athul and J. upstream in
[1][2] where if there is a bug in a fuse server that causes the server to
never complete writeback, it will make wait_sb_inodes() wait forever.

Thanks,
Joanne

[1] https://lore.kernel.org/regressions/CAJnrk1ZjQ8W8NzojsvJPRXiv9TuYPNdj8Ye7=Cgkj=iV_i8EaA@mail.gmail.com/T/#t
[2] https://lore.kernel.org/linux-fsdevel/aT7JRqhUvZvfUQlV@eldamar.lan/

Changelog:
v1: https://lore.kernel.org/linux-mm/20251120184211.2379439-1-joannelkoong@gmail.com/
* Change AS_WRITEBACK_MAY_HANG to AS_NO_DATA_INTEGRITY and keep
  AS_WRITEBACK_MAY_DEADLOCK_ON_RECLAIM as is.

Joanne Koong (1):
  fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()

 fs/fs-writeback.c       |  3 ++-
 fs/fuse/file.c          |  4 +++-
 include/linux/pagemap.h | 11 +++++++++++
 3 files changed, 16 insertions(+), 2 deletions(-)

-- 
2.47.3