On 6/29/20 1:31 AM, Mark Otaris wrote:
> The master branch for cp now defaults to copy-on-write on filesystems
> that support reflinks, which should make copies more efficient if
> Fedora starts using btrfs:
> https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=25725f9d41735d176d73a757430739fb71c7d043.
>
> Dolphin and KIO also seem like they will start doing this:
> https://bugs.kde.org/show_bug.cgi?id=326880,
> https://invent.kde.org/frameworks/kio/commit/c2faaae697f11ee600989b67b4406981838ae628.
>
> Beyond these recent changes, there are many other reasons to use
> btrfs, such as that Podman has a btrfs driver that might make
> containers more efficient, that ostree makes limited use of reflinks
> when they are available, that many filesystem options can be changed
> and new features and better defaults used even after the filesystem
> was initially created, that resize operations can be done online, and
> that there are uniform checksums on all metadata blocks, giving
> guarantees against corruption.
>
> XFS also has reflinks, but lacks many features of btrfs, and switching
> from ext4 to XFS would mean losing cgroup writeback.
That's incorrect:
commit adfb5fb46af059387eca0fce1d8cd8733f9ee3a0
Author: Christoph Hellwig <h...@lst.de>
Date: Fri Jun 28 19:30:22 2019 -0700
xfs: implement cgroup aware writeback
Link every newly allocated writeback bio to cgroup pointed to by the
writeback control structure, and charge every byte written back to it.
Tested-by: Stefan Priebe - Profihost AG <s.pri...@profihost.ag>
Signed-off-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Darrick J. Wong <darrick.w...@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.w...@oracle.com>
-Eric
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