linux-xfs.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
To: <djwong@kernel.org>, <hch@lst.de>, <linux-xfs@vger.kernel.org>
Cc: <ruansy.fnst@fujitsu.com>, <dan.j.williams@intel.com>,
	<david@fromorbit.com>, <linux-fsdevel@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <nvdimm@lists.linux.dev>,
	<rgoldwyn@suse.de>, <viro@zeniv.linux.org.uk>,
	<willy@infradead.org>
Subject: [PATCH v7 0/8] fsdax,xfs: Add reflink&dedupe support for fsdax
Date: Mon, 16 Aug 2021 14:03:51 +0800	[thread overview]
Message-ID: <20210816060359.1442450-1-ruansy.fnst@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.

Changes from V6:
 - Rebased on switch iomap to an iterator model v2[1]
 - Replace iomap_apply2() with iomap_iter2() because of the new model
 - Introduce dax_iomap_ops and dax_iomap_ops->actor_end() to handle the end
     of CoW before iomap_ops->iomap_end()

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 mechanisms implemented in fsdax, we are able to make reflink
and fsdax work together in XFS.

(Rebased on v5.14-rc4 and Christoph's "switch iomap to an iterator model v2"[1])
[1]: https://lore.kernel.org/linux-xfs/20210809061244.1196573-1-hch@lst.de/
==

Shiyang Ruan (8):
  fsdax: Output address in dax_iomap_pfn() and rename it
  fsdax: Introduce dax_iomap_cow_copy()
  fsdax: Replace mmap entry in case of CoW
  fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero
  iomap: Introduce iomap_iter2 for two files
  fsdax: Dedup file range to use a compare function
  fsdax: Introduce dax_iomap_ops for end of reflink
  fs/xfs: Add dax dedupe support

 fs/dax.c               | 307 ++++++++++++++++++++++++++++++++++++-----
 fs/ext2/ext2.h         |   3 +
 fs/ext2/file.c         |   6 +-
 fs/ext2/inode.c        |  11 +-
 fs/ext4/ext4.h         |   3 +
 fs/ext4/file.c         |   6 +-
 fs/ext4/inode.c        |  13 +-
 fs/iomap/buffered-io.c |   7 +-
 fs/iomap/core.c        |  51 +++++++
 fs/remap_range.c       |  39 ++++--
 fs/xfs/xfs_bmap_util.c |   3 +-
 fs/xfs/xfs_file.c      |  10 +-
 fs/xfs/xfs_inode.c     |  57 ++++++++
 fs/xfs/xfs_inode.h     |   1 +
 fs/xfs/xfs_iomap.c     |  36 ++++-
 fs/xfs/xfs_iomap.h     |  33 +++++
 fs/xfs/xfs_iops.c      |   7 +-
 fs/xfs/xfs_reflink.c   |  15 +-
 include/linux/dax.h    |  32 ++++-
 include/linux/fs.h     |  12 +-
 include/linux/iomap.h  |   3 +
 21 files changed, 570 insertions(+), 85 deletions(-)

-- 
2.32.0




             reply	other threads:[~2021-08-16  6:04 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16  6:03 Shiyang Ruan [this message]
2021-08-16  6:03 ` [PATCH v7 1/8] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-08-18 21:01   ` Dan Williams
2021-08-16  6:03 ` [PATCH v7 2/8] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-08-19 22:35   ` Dan Williams
2021-08-16  6:03 ` [PATCH v7 3/8] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-08-19 22:54   ` Dan Williams
2021-08-23 12:57     ` Christoph Hellwig
2021-08-27  3:22       ` Shiyang Ruan
2021-08-27  5:00         ` Dan Williams
2021-08-27  5:26           ` Shiyang Ruan
2021-08-16  6:03 ` [PATCH v7 4/8] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero Shiyang Ruan
2021-08-20  2:39   ` Dan Williams
2021-08-27  3:23     ` Shiyang Ruan
2021-08-16  6:03 ` [PATCH v7 5/8] iomap: Introduce iomap_iter2 for two files Shiyang Ruan
2021-08-23 12:58   ` Christoph Hellwig
2021-08-16  6:03 ` [PATCH v7 6/8] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-08-23 13:16   ` Christoph Hellwig
2021-08-16  6:03 ` [PATCH v7 7/8] fsdax: Introduce dax_iomap_ops for end of reflink Shiyang Ruan
2021-08-20  3:01   ` Dan Williams
     [not found]     ` <c7e68dc8-5a43-f727-c262-58dcf244c711@fujitsu.com>
2021-08-20 15:18       ` Dan Williams
2021-08-23 13:02         ` Christoph Hellwig
2021-08-27  3:29         ` Shiyang Ruan
2021-08-27  5:04           ` Dan Williams
2021-08-27  5:27             ` Shiyang Ruan
2021-08-16  6:03 ` [PATCH v7 8/8] fs/xfs: Add dax dedupe support Shiyang Ruan
2021-08-20  3:08   ` Dan Williams
2021-08-27  3:36     ` Shiyang Ruan

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=20210816060359.1442450-1-ruansy.fnst@fujitsu.com \
    --to=ruansy.fnst@fujitsu.com \
    --cc=dan.j.williams@intel.com \
    --cc=david@fromorbit.com \
    --cc=djwong@kernel.org \
    --cc=hch@lst.de \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-xfs@vger.kernel.org \
    --cc=nvdimm@lists.linux.dev \
    --cc=rgoldwyn@suse.de \
    --cc=viro@zeniv.linux.org.uk \
    --cc=willy@infradead.org \
    --subject='Re: [PATCH v7 0/8] fsdax,xfs: Add reflink&dedupe support for fsdax' \
    /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

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).