linux-kernel - Re: [GIT PULL] Btrfs

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Date:	Fri, 13 Sep 2013 09:07:36 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Chris Mason <chris.mason@...ionio.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Btrfs

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 :)

Ric


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