From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:25143 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932301Ab3IMNHj (ORCPT ); Fri, 13 Sep 2013 09:07:39 -0400 Message-ID: <52330E18.5040405@redhat.com> Date: Fri, 13 Sep 2013 09:07:36 -0400 From: Ric Wheeler MIME-Version: 1.0 To: Chris Mason CC: Linus Torvalds , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] Btrfs References: <20130912153629.16487.88969@localhost.localdomain> In-Reply-To: <20130912153629.16487.88969@localhost.localdomain> Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: 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