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From: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
To: <linux-kernel@vger.kernel.org>, <linux-xfs@vger.kernel.org>,
	<linux-nvdimm@lists.01.org>, <linux-fsdevel@vger.kernel.org>
Cc: jack@suse.cz, darrick.wong@oracle.com, david@fromorbit.com,
	ocfs2-devel@oss.oracle.com, viro@zeniv.linux.org.uk,
	dan.j.williams@intel.com, linux-btrfs@vger.kernel.org
Subject: [Ocfs2-devel] [PATCH 0/7] fsdax, xfs: Add reflink&dedupe support for fsdax
Date: Mon, 8 Feb 2021 01:09:17 +0800	[thread overview]
Message-ID: <20210207170924.2933035-1-ruansy.fnst@cn.fujitsu.com> (raw)

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.

(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




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             reply	other threads:[~2021-02-08 16:54 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-07 17:09 Shiyang Ruan [this message]
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

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