Date: Tue, 15 Dec 1998 13:05:43 -0500 (EST) From: Alfred Perlstein <bright@hotjobs.com> To: John Polstra <jdp@polstra.com> Cc: eivind@yes.no, hackers@FreeBSD.ORG Subject: Re: idea/help w. mirroring Message-ID: <Pine.BSF.4.05.9812151303010.27793-100000@bright.fx.genx.net> In-Reply-To: <199812151753.JAA16545@vashon.polstra.com>
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On Tue, 15 Dec 1998, John Polstra wrote: > In article <19981214232905.R5444@follo.net>, > Eivind Eklund <eivind@yes.no> wrote: > > On Mon, Dec 14, 1998 at 04:39:42PM -0500, Alfred Perlstein wrote: > > > > > > Has anyone written something that could be used to intercept all calls to > > > write out file modification and give the modifications to a userland > > > application? > > > > > > I'm interested in the most efficient method of doing filesystem mirroring, > > > passing that info into a userland app using multicast would be ideal. > > > > > > The userland app may see which blocks of which file have been modified and > > > distribute deltas across the network. > > Something like that would also be useful to reduce the load on > primary CVSup server hosts such as freefall. anything dealing with deltas would work much fast with this. > > > Stacking layer. > > Ha ha ha, how about something that actually works, as opposed to > "sounds good in the McKusick book"? As far as I can tell, there's not > a single stackable filesystem in FreeBSD that works well enough to use > in practice. I was thinking of intercepting the calls to actually write out data, however i think that by that point we are mapped to a physical address on the disk/media and not a logical block within a file. :/ I really need to read more kernel code. Our 'stacking' does work afaik? just no facilities for callbacks on a local filesystem right? Alfred Perlstein - Programmer, HotJobs Inc. - www.hotjobs.com -- There are operating systems, and then there's FreeBSD. -- http://www.freebsd.org/ 3.0-current > John > -- > John Polstra jdp@polstra.com > John D. Polstra & Co., Inc. Seattle, Washington USA > "Nobody ever went broke underestimating the taste of the American public." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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