[RFC,0/3] virtiofs,fuse: support per-file DAX

Message

Jingbo Xu July 15, 2021, 9:30 a.m. UTC

This patchset adds support of per-file DAX for virtiofs, which is
inspired by Ira Weiny's work on ext4[1] and xfs[2].

Currently virtiofs (in guest kernel) accepts per-file DAX flag from FUSE
server (in host). 

Currently it is not implemented yet to change per-file DAX flag inside
guest kernel, e.g., by chattr(1).

Any comment is welcome. :)


[1] commit 9cb20f94afcd ("fs/ext4: Make DAX mount option a tri-state")
[2] commit 02beb2686ff9 ("fs/xfs: Make DAX mount option a tri-state")

Jeffle Xu (3):
  fuse: add fuse_should_enable_dax() helper
  fuse: Make DAX mount option a tri-state
  fuse: add per-file DAX flag

 fs/fuse/dax.c             | 43 +++++++++++++++++++++++++++++++++++++--
 fs/fuse/file.c            |  4 ++--
 fs/fuse/fuse_i.h          | 16 +++++++++++----
 fs/fuse/inode.c           |  6 ++++--
 fs/fuse/virtio_fs.c       | 16 +++++++++++++--
 include/uapi/linux/fuse.h |  5 +++++
 6 files changed, 78 insertions(+), 12 deletions(-)