This patchset aims to take care of this issue to make reflink and dedupe work correctly (actually in read/write path, there still has some problems, such as the page->mapping and page->index issue, in mmap path) in XFS under fsdax mode. It is based on Goldwyn's patchsets: "v4 Btrfs dax support" and the latest iomap. I borrowed 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 (two iomaps). For XFS: 1. distinguish dax write/zero from normal write/zero. 2. remap extents after COW. 3. add file contents comparison function based on dax framework. 4. use xfs_break_layouts() instead of break_layout 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: handle copy-on-write in fsdax write() path. xfs: support dedupe for fsdax. fs/btrfs/ioctl.c | 3 +- fs/dax.c | 211 +++++++++++++++++++++++++++++++++++++---- fs/iomap/buffered-io.c | 8 +- fs/ocfs2/file.c | 2 +- fs/read_write.c | 11 ++- fs/xfs/xfs_bmap_util.c | 6 +- fs/xfs/xfs_file.c | 10 +- fs/xfs/xfs_iomap.c | 3 +- fs/xfs/xfs_iops.c | 11 ++- fs/xfs/xfs_reflink.c | 79 ++++++++------- include/linux/dax.h | 16 ++-- include/linux/fs.h | 9 +- 12 files changed, 291 insertions(+), 78 deletions(-) -- 2.23.0
