Re: Announcing btrfs-dedupe

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Mon, Nov 07, 2016 at 09:54:09PM +0100, Adam Borowski wrote:
> On Mon, Nov 07, 2016 at 09:48:41AM -0800, Mark Fasheh wrote:
> > also on XFS with the dedupe ioctl (I believe this should be out with
> > Linux-4.9).
> 
> It's already there in 4.9-rc1, although you need a special version of
> xfsprogs (possibly already released, I didn't check).  It's an experimental
> feature that needs to be enabled with "-m reflink=1".

The code will be available in xfsprogs 4.9, due out after Linux 4.9.

You'll still have to pass '-m reflink=1' to enable reflink until we
declare the feature stable, however.

> Despite that experimental status, I'd strongly recommend James to test his
> tool on xfs as well, as it's the second major implementation of this API[1].

Agreed. :)

> Mark has already included XFS in documentation of duperemove, all that looks
> amiss is btrfs-extent-same having an obsolete name.  But then, I never did
> any non-superficial tests on XFS, beyond "seems to work".

/me wonders if ocfs2 will ever catch up to the reflink/dedupe party. ;)

--Darrick

> 
> 
> Meow!
> 
> [1]. For some reasons zfs-on-linux guys didn't implement this yet, despite
> it being an obvious thing on ZFS.
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