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

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Message-ID: <20190731203324.7vjwlejmwpghpvqi@fiona>
Date:   Wed, 31 Jul 2019 15:33:24 -0500
From:   Goldwyn Rodrigues <rgoldwyn@...e.de>
To:     Shiyang Ruan <ruansy.fnst@...fujitsu.com>
Cc:     linux-xfs@...r.kernel.org, linux-nvdimm@...ts.01.org,
        darrick.wong@...cle.com, linux-kernel@...r.kernel.org,
        gujx@...fujitsu.com, david@...morbit.com, qi.fuli@...itsu.com,
        caoj.fnst@...fujitsu.com
Subject: Re: [RFC PATCH 0/7] xfs: add reflink & dedupe support for fsdax.

On 19:49 31/07, Shiyang Ruan wrote:
> 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.

Shiyang,

I think you used the older patches which does not contain the iomap changes
which would call iomap_begin() with two iomaps. I have it in the btrfs-iomap
branch and plan to update it today. It is built on v5.3-rcX, so it should
contain the changes which moves the iomap code to the different directory.
I will build the dax patches on top of that.
However, we are making a big dependency chain here :(

-- 
Goldwyn

> 
> 
> 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(-)
> 
> -- 
> 2.17.0
> 
> 
> 

-- 
Goldwyn