Date: Mon, 28 Aug 2006 11:47:03 -0500 From: Eric Anderson <anderson@centtech.com> To: Christian Laursen <xi@borderworlds.dk> Cc: freebsd-geom@freebsd.org Subject: Re: Geom class project idea - geom_cow Message-ID: <44F31E07.4050008@centtech.com> In-Reply-To: <ygfpsek95qk.fsf@dominion.borderworlds.dk> References: <ygfpsek95qk.fsf@dominion.borderworlds.dk>
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On 08/28/06 11:37, Christian Laursen wrote: > I have an idea for a geom class that I think could be useful in a number > of scenarios. > > The basic idea is that it takes two existing providers and uses the first > one as a starting point and the other one to keep changes to the first > one using copy-on-write. > > The second provider will need a bitmap to keep track of the blocks that > have changed as well as at least as much space as the base provider. > > A number of the cases in which this class would prove useful are cases > where you would otherwise choose unionfs. However, approaching this > problem in geom seems simpler. (At least to me) > > I propose that this idea be added to <http://www.freebsd.org/projects/ideas/>; > and/or <http://www.freebsd.org/projects/summerofcode.html>. > > Unfortunately I don't have the time nor much kernel hacking experience to > do this myself at this point. > This sounds a little like the gjournal project done by Ivan Voras for last years SoC project. Does it seem like what you want? Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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