[RFC PATCH 0/7] xfs: add reflink & dedupe support for fsdax.

Shiyang Ruan
2019-07-31T11:52:18Z

This patchset aims to take care of this issue to make reflink and dedupe
work correctly in XFS.

It is based on Goldwyn's patchsets: "v4 Btrfs dax support" and "Btrfs
iomap". I picked up some patches related and made a few fix to make it
basically works fine.

For dax framework:
1. adapt to the latest change in iomap.

For XFS:
1. report the source address and set IOMAP_COW type for those write
operations that need COW.
2. update extent list at the end.
3. add file contents comparison function based on dax framework.
4. use xfs_break_layouts() to support dax.

Goldwyn Rodrigues (3):
dax: replace mmap entry in case of CoW
fs: dedup file range to use a compare function
dax: memcpy before zeroing range

Shiyang Ruan (4):
dax: Introduce dax_copy_edges() for COW.
dax: copy data before write.
xfs: Add COW handle for fsdax.
xfs: Add dedupe support for fsdax.

fs/btrfs/ioctl.c | 11 ++-
fs/dax.c | 203 ++++++++++++++++++++++++++++++++++++++----
fs/iomap.c | 9 +-
fs/ocfs2/file.c | 2 +-
fs/read_write.c | 11 +--
fs/xfs/xfs_iomap.c | 42 +++++----
fs/xfs/xfs_reflink.c | 84 +++++++++--------
include/linux/dax.h | 15 ++--
include/linux/fs.h | 8 +-
include/linux/iomap.h | 6 ++
10 files changed, 294 insertions(+), 97 deletions(-)