linux-kernel - Re: [GIT PULL] Btrfs

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Date:	Fri, 13 Sep 2013 15:11:59 +0100
From:	Hugo Mills <hugo@...fax.org.uk>
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	Chris Mason <chris.mason@...ionio.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Btrfs

On Fri, Sep 13, 2013 at 09:07:36AM -0400, Ric Wheeler wrote:
> On 09/12/2013 11:36 AM, Chris Mason wrote:
> >Mark Fasheh's offline dedup work is also here.  In this case offline
> >means the FS is mounted and active, but the dedup work is not done
> >inline during file IO.   This is a building block where utilities  are
> >able to ask the FS to dedup a series of extents.  The kernel takes
> >care of verifying the data involved really is the same.  Today this
> >involves reading both extents, but we'll continue to evolve the patches.
> 
> Nice feature!
> 
> Just a note, the "offline" label is really confusing. In other
> storage products, they typically call this "out of band" since you
> are online but not during the actual write in a synchronous way :)

   I knew there was a specific term for this, but couldn't remember
what it was. I've now updated the btrfs website's description(s) of
the feature to include "out-of-band" and "in-band".

   Hugo.

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