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    SubjectRe: [RFC PATCH v2 0/7] xfs: reflink & dedupe for fsdax (read/write path).
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    Hi Darrick, Dave,

    Do you have any comment on this?

    On 10/30/19 12:13 PM, Shiyang Ruan wrote:
    > 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(-)
    >

    --
    Thanks,
    Shiyang Ruan.


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