From: Ruan Shiyang <ruansy.fnst@cn.fujitsu.com>
To: Jan Kara <jack@suse.cz>
Cc: darrick.wong@oracle.com, linux-nvdimm@lists.01.org,
david@fromorbit.com, linux-kernel@vger.kernel.org,
linux-xfs@vger.kernel.org, ocfs2-devel@oss.oracle.com,
viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
dan.j.williams@intel.com, linux-btrfs@vger.kernel.org
Subject: Re: [Ocfs2-devel] [PATCH 0/7] fsdax, xfs: Add reflink&dedupe support for fsdax
Date: Tue, 9 Feb 2021 09:50:58 +0800 [thread overview]
Message-ID: <31e9aa48-7830-efe2-837f-e31cba2da491@cn.fujitsu.com> (raw)
In-Reply-To: <20210208153911.GE30081@quack2.suse.cz>
On 2021/2/8 下午11:39, Jan Kara wrote:
> On Mon 08-02-21 01:09:17, Shiyang Ruan wrote:
>> This patchset is attempt to add CoW support for fsdax, and take XFS,
>> which has both reflink and fsdax feature, as an example.
>>
>> One of the key mechanism need to be implemented in fsdax is CoW. Copy
>> the data from srcmap before we actually write data to the destance
>> iomap. And we just copy range in which data won't be changed.
>>
>> Another mechanism is range comparison . In page cache case, readpage()
>> is used to load data on disk to page cache in order to be able to
>> compare data. In fsdax case, readpage() does not work. So, we need
>> another compare data with direct access support.
>>
>> With the two mechanism implemented in fsdax, we are able to make reflink
>> and fsdax work together in XFS.
>>
>> Some of the patches are picked up from Goldwyn's patchset. I made some
>> changes to adapt to this patchset.
>
> How do you deal with HWPoison code trying to reverse-map struct page back
> to inode-offset pair? This also needs to be fixed for reflink to work with
> DAX.
>
I have posted v3 patchset to add reverse-map support for dax page
yesterday. Please take a look at this:
https://lkml.org/lkml/2021/2/8/347
--
Thanks,
Ruan Shiyang.
> Honza
>
>>
>> (Rebased on v5.10)
>> ==
>>
>> Shiyang Ruan (7):
>> fsdax: Output address in dax_iomap_pfn() and rename it
>> fsdax: Introduce dax_copy_edges() for CoW
>> fsdax: Copy data before write
>> fsdax: Replace mmap entry in case of CoW
>> fsdax: Dedup file range to use a compare function
>> fs/xfs: Handle CoW for fsdax write() path
>> fs/xfs: Add dedupe support for fsdax
>>
>> fs/btrfs/reflink.c | 3 +-
>> fs/dax.c | 188 ++++++++++++++++++++++++++++++++++++++---
>> fs/ocfs2/file.c | 2 +-
>> fs/remap_range.c | 14 +--
>> fs/xfs/xfs_bmap_util.c | 6 +-
>> fs/xfs/xfs_file.c | 30 ++++++-
>> fs/xfs/xfs_inode.c | 8 +-
>> fs/xfs/xfs_inode.h | 1 +
>> fs/xfs/xfs_iomap.c | 3 +-
>> fs/xfs/xfs_iops.c | 11 ++-
>> fs/xfs/xfs_reflink.c | 23 ++++-
>> include/linux/dax.h | 5 ++
>> include/linux/fs.h | 9 +-
>> 13 files changed, 270 insertions(+), 33 deletions(-)
>>
>> --
>> 2.30.0
>>
>>
>>
_______________________________________________
Ocfs2-devel mailing list
Ocfs2-devel@oss.oracle.com
https://oss.oracle.com/mailman/listinfo/ocfs2-devel
prev parent reply other threads:[~2021-02-09 1:54 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-07 17:09 [Ocfs2-devel] [PATCH 0/7] fsdax, xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 1/7] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-02-08 15:11 ` Christoph Hellwig
2021-02-22 7:44 ` Xiaoguang Wang
2021-02-23 1:32 ` [Ocfs2-devel] 回复: " ruansy.fnst
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 2/7] fsdax: Introduce dax_copy_edges() for CoW Shiyang Ruan
2021-02-08 15:11 ` Christoph Hellwig
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 3/7] fsdax: Copy data before write Shiyang Ruan
2021-02-08 15:14 ` Christoph Hellwig
2021-02-09 1:53 ` Ruan Shiyang
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 4/7] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-02-08 15:16 ` Christoph Hellwig
2021-02-16 13:11 ` David Sterba
2021-02-17 3:06 ` Ruan Shiyang
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 5/7] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-02-08 15:19 ` Christoph Hellwig
2021-02-09 9:15 ` Ruan Shiyang
2021-02-09 9:34 ` Christoph Hellwig
2021-02-09 9:46 ` Ruan Shiyang
2021-02-10 13:19 ` Christoph Hellwig
2021-02-17 3:24 ` Ruan Shiyang
2021-02-18 16:20 ` Darrick J. Wong
2021-02-25 7:35 ` Christoph Hellwig
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 6/7] fs/xfs: Handle CoW for fsdax write() path Shiyang Ruan
2021-02-08 15:24 ` Christoph Hellwig
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 7/7] fs/xfs: Add dedupe support for fsdax Shiyang Ruan
2021-02-08 15:39 ` [Ocfs2-devel] [PATCH 0/7] fsdax, xfs: Add reflink&dedupe " Jan Kara
2021-02-09 1:50 ` Ruan Shiyang [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=31e9aa48-7830-efe2-837f-e31cba2da491@cn.fujitsu.com \
--to=ruansy.fnst@cn.fujitsu.com \
--cc=dan.j.williams@intel.com \
--cc=darrick.wong@oracle.com \
--cc=david@fromorbit.com \
--cc=jack@suse.cz \
--cc=linux-btrfs@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nvdimm@lists.01.org \
--cc=linux-xfs@vger.kernel.org \
--cc=ocfs2-devel@oss.oracle.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).