From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: [PATCH v3 00/12] snapshot-merge target Date: Thu, 19 Nov 2009 12:45:52 -0500 Message-ID: <20091119174551.GA5852@redhat.com> References: <1258474344-10886-1-git-send-email-snitzer@redhat.com> <87y6m24uyk.fsf@basil.nowhere.org> <20091119140233.GA3894@redhat.com> <20091119145338.GF6644@agk-dp.fab.redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20091119145338.GF6644@agk-dp.fab.redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Alasdair G Kergon Cc: device-mapper development , Andi Kleen List-Id: dm-devel.ids On Thu, Nov 19 2009 at 9:53am -0500, Alasdair G Kergon wrote: > On Thu, Nov 19, 2009 at 09:02:33AM -0500, Mike Snitzer wrote: > > DM (and LVM) snapshot merging allows a snapshot (its COW store) to be > > merged back into the snapshot's origin device. > > One expected use of snapshot merging is rollback of a root filesystem > > after system upgrades (e.g.: yum update). > > Has the patch to 'Documentation/device-mapper' been written yet? > (It won't go upstream until we have that of course. Same for the > replicator and any other new dm targets.) Nope, I'll work on that (and adding comments like Andi suggested). I'll include these changes into the v4 snapshot-merge patchset submission that I'll be getting out today. The v4 patchset will be based on v9 of the handover patch that we worked on (which I just emailed to dm-devel). Mike