My apologies. Sent this from my mobile and forgot to send it to the list. --- João Eduardo Luís gpg key: 477C26E5 from pool.keyserver.eu Begin forwarded message: > From: João Eduardo Luís <jecluis@xxxxxxxxx> > Date: May 23, 2011 11:22:51 AM GMT+01:00 > To: Hugo Mills <hugo@xxxxxxxxxxxxx> > Subject: Re: Backref walking utilities > > > On May 23, 2011, at 11:15 AM, Hugo Mills wrote: > >> On Mon, May 23, 2011 at 12:02:21PM +0200, Arne Jansen wrote: >>> Hi liubo, >>> >>> On 23.05.2011 11:53, liubo wrote: >>>> As one of my plans, I'm going to take this project over unless someone has been working on it. >>> >>> Jan Schmidt has a patch for scrub nearly ready, that does some >>> ref-walking to report affected files to the user. While this is >>> kernel code and you're planning to add user-space code, it might >>> still be possible to share some of it. Maybe the efforts can be >>> coordinated. >> >> Another use for walking backrefs for a block (or an extent) is to >> work out the differential size of a snapshot -- i.e. how much space >> will be freed up if the snapshot is deleted. (You need to look at >> every extent of every file in the snapshot, and work out whether those >> extents are used anywhere outside the subvolume). > > Which, I believe, would be useful if one wanted to merge two diverging snapshots into one. > > As I'm doing some research on this topic, I would be thankful if anyone pointed me to Jan Schmidt's patch. > > > - J > > --- > João Eduardo Luís > gpg key: 477C26E5 from pool.keyserver.eu > > > > >
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