Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757641Ab3IMOv4 (ORCPT ); Fri, 13 Sep 2013 10:51:56 -0400 Received: from frost.carfax.org.uk ([85.119.82.111]:42661 "EHLO frost.carfax.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756581Ab3IMOvy (ORCPT ); Fri, 13 Sep 2013 10:51:54 -0400 X-Greylist: delayed 2387 seconds by postgrey-1.27 at vger.kernel.org; Fri, 13 Sep 2013 10:51:54 EDT Date: Fri, 13 Sep 2013 15:11:59 +0100 From: Hugo Mills To: Ric Wheeler Cc: Chris Mason , Linus Torvalds , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] Btrfs Message-ID: <20130913141159.GI25694@carfax.org.uk> Mail-Followup-To: Hugo Mills , Ric Wheeler , Chris Mason , Linus Torvalds , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org References: <20130912153629.16487.88969@localhost.localdomain> <52330E18.5040405@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="h22Fi9ANawrtbNPX" Content-Disposition: inline In-Reply-To: <52330E18.5040405@redhat.com> X-GPG-Fingerprint: B25A 5A66 69D3 1E15 2DD8 0998 BF73 F4E5 65E7 4AC0 X-GPG-Key: 65E74AC0 X-Parrot: It is no more. It has joined the choir invisible. X-IRC-Nicks: darksatanic darkersatanic darkling darkthing User-Agent: Mutt/1.5.21 (2010-09-15) X-frost.carfax.org.uk-Spam-Score: 0.0 (/) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2571 Lines: 60 --h22Fi9ANawrtbNPX Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Once is happenstance; twice is coincidence; three times --- is enemy action. --h22Fi9ANawrtbNPX Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) iQIVAwUBUjMdL1heFHXiqx3kAQKSDw//Yn/vpAPBkTsSUTB7DbamrEP8b8stR0lS kOkiA7N3mnSr36MLi8NZyrsvvxPU1LenwqgpQe1dQEsiOkVuZHIQY+T1OlM8nMMI ZzcsLw/4Y/fJEJ02ZG2VKk4YOdXS68YYph1RaWTZwPvCrUvtWrIlLy/8vm0qOFQJ MiHAswH1WWL3l14eR9+CMdime8+zOQPaMRvezZwlFff/EMQEHIlnvy/yvdpbEehQ gztV8RepbM8lFJQDS7g4fGd37ACByhH0ko9/OHmHOBRqvEfAa1hxkZ/DGySeH39t rnsv+D3OyjS4v/xcShTkdPrq7XVlZBaMqddEA3Q5C74V+2mIktRYc1mTgO4ngHYz 3zgd/A393BvvYuFFbWLNVUuPAzCQhPV3YXwpwtjM/kiG69JYbqy3ttlBN1yODlr8 EJwlik7cwLWTNtsHP54QtbDFbtiSGXmXqmCNmMy+a6qI+4uJImInWFW3wmq5rldI TGn11ddHDd8QSUTZiZZMgQRIgaKScdpH89D4uU20dX/j2Pncvh5UzbdynV8GEgQi HX2vzwHgNDhr4Q5Cfalq2txBV2RK2ZtXgxqw0BVmKDbZWprZ8dgPaiBnKf9OUCSK iv8O1LuO66/n3bU7fmQUTU0nMTR1fOrTDaUQxthb4Zo7sq7TJBvZr7Sq36NA3lSn SE5o7xAInrY= =mKzG -----END PGP SIGNATURE----- --h22Fi9ANawrtbNPX-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/