From: "Darrick J. Wong" <djwong@kernel.org>
To: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Cc: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org,
darrick.wong@oracle.com, dan.j.williams@intel.com,
willy@infradead.org, viro@zeniv.linux.org.uk,
david@fromorbit.com, hch@lst.de, rgoldwyn@suse.de
Subject: Re: [PATCH v5 0/7] fsdax,xfs: Add reflink&dedupe support for fsdax
Date: Mon, 10 May 2021 20:57:06 -0700 [thread overview]
Message-ID: <20210511035706.GL8582@magnolia> (raw)
In-Reply-To: <20210511030933.3080921-1-ruansy.fnst@fujitsu.com>
On Tue, May 11, 2021 at 11:09:26AM +0800, 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.
Slightly off topic, but I noticed all my pmem disappeared once I rolled
forward to 5.13-rc1. Am I the only lucky one? Qemu 4.2, with fake
memory devices backed by tmpfs files -- info qtree says they're there,
but the kernel doesn't show anything in /proc/iomem.
--D
> Changes from V4:
> - Fix the mistake of breaking dax layout for two inodes
> - Add CONFIG_FS_DAX judgement for fsdax code in remap_range.c
> - Fix other small problems and mistakes
>
> Changes from V3:
> - Take out the first 3 patches as a cleanup patchset[1], which has been
> sent yesterday.
> - Fix usage of code in dax_iomap_cow_copy()
> - Add comments for macro definitions
> - Fix other code style problems and mistakes
>
> 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.
>
> Some of the patches are picked up from Goldwyn's patchset. I made some
> changes to adapt to this patchset.
>
>
> (Rebased on v5.13-rc1 and patchset[1])
> [1]: https://lkml.org/lkml/2021/4/22/575
>
> Shiyang Ruan (7):
> 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_apply2() for operations on two files
> fsdax: Dedup file range to use a compare function
> fs/xfs: Handle CoW for fsdax write() path
> fs/xfs: Add dax dedupe support
>
> fs/dax.c | 206 +++++++++++++++++++++++++++++++++++------
> fs/iomap/apply.c | 52 +++++++++++
> fs/iomap/buffered-io.c | 2 +-
> fs/remap_range.c | 57 ++++++++++--
> fs/xfs/xfs_bmap_util.c | 3 +-
> fs/xfs/xfs_file.c | 11 +--
> fs/xfs/xfs_inode.c | 66 ++++++++++++-
> fs/xfs/xfs_inode.h | 1 +
> fs/xfs/xfs_iomap.c | 61 +++++++++++-
> fs/xfs/xfs_iomap.h | 4 +
> fs/xfs/xfs_iops.c | 7 +-
> fs/xfs/xfs_reflink.c | 15 +--
> include/linux/dax.h | 7 +-
> include/linux/fs.h | 12 ++-
> include/linux/iomap.h | 7 +-
> 15 files changed, 449 insertions(+), 62 deletions(-)
>
> --
> 2.31.1
>
>
>
next prev parent reply other threads:[~2021-05-11 3:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 3:09 [PATCH v5 0/7] fsdax,xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-05-11 3:09 ` [PATCH v5 1/7] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-05-12 1:08 ` Darrick J. Wong
2021-05-13 7:57 ` ruansy.fnst
2021-05-13 15:02 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 2/7] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-05-12 1:09 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 3/7] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero Shiyang Ruan
2021-05-12 1:17 ` Darrick J. Wong
2021-05-12 1:37 ` ruansy.fnst
2021-05-25 22:17 ` Darrick J. Wong
2021-05-12 2:27 ` Mika Penttilä
2021-05-13 7:48 ` ruansy.fnst
2021-05-11 3:09 ` [PATCH v5 4/7] iomap: Introduce iomap_apply2() for operations on two files Shiyang Ruan
2021-05-11 3:09 ` [PATCH v5 5/7] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-05-12 1:23 ` Darrick J. Wong
2021-05-14 8:35 ` ruansy.fnst
2021-05-14 16:03 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 6/7] fs/xfs: Handle CoW for fsdax write() path Shiyang Ruan
2021-05-12 1:30 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 7/7] fs/xfs: Add dax dedupe support Shiyang Ruan
2021-05-12 1:04 ` Darrick J. Wong
2021-05-12 1:26 ` ruansy.fnst
2021-05-11 3:57 ` Darrick J. Wong [this message]
2021-05-11 5:53 ` [PATCH v5 0/7] fsdax,xfs: Add reflink&dedupe support for fsdax ruansy.fnst
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