Date: Wed, 1 Oct 2008 12:29:07 -0700 From: "Peter Wemm" <peter@wemm.org> To: "Jeremy Chadwick" <koitsu@freebsd.org> Cc: Derek Kuli??ski <takeda@takeda.tk>, lhmwzy <lhmwzy@gmail.com>, freebsd-stable@freebsd.org Subject: Re: Would anybody port DragonFlyBSD's HAMMER fs to FreeBSD? Message-ID: <e7db6d980810011229t32df6d74w209cb46fbd9a7828@mail.gmail.com> In-Reply-To: <20081001071309.GA13616@icarus.home.lan> References: <78fb9d960809291927n60358006w7ef845e7cb40ed93@mail.gmail.com> <78fb9d960809301653o5cb09cefpf05eba0a9926b9fc@mail.gmail.com> <e71790db0809301757t26665ad1v9355721392599565@mail.gmail.com> <274267384.20080930223647@takeda.tk> <78fb9d960809302310s3f817505j6605420e451268e4@mail.gmail.com> <1031817271.20080930231836@takeda.tk> <78fb9d960809302329i5958966bh988c2531741e5c1@mail.gmail.com> <20081001071309.GA13616@icarus.home.lan>
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On Wed, Oct 1, 2008 at 12:13 AM, Jeremy Chadwick <koitsu@freebsd.org> wrote: > On Wed, Oct 01, 2008 at 02:29:12PM +0800, lhmwzy wrote: >> That's it. >> Since we don't have the skill,what we can do is wait. >> >> Waiting is such a bad thing....... > > If this functionality is really something you want/need, you should > consider finding a kernel programmer who would be willing to port it, > for financial exchange (in English: you will be paying them $XX/hour > to port it to FreeBSD). > > This has happened in the past for some key features. Like I said, it > all depends on how much it matters to you. Another big consideration, is is 'HAMMER' sufficiently 'finished' to be worth trying this yet? Anybody attempting a port is going to have enough to worry about with the VFS/VM semantics differences, locking differences etc between the two different kernels. Having to worry about following a moving target as well would add unneeded difficulty. To be honest, I've not looked at the state of HAMMER. Is it still under active development or is it in a state where you could easily work from a snapshot of the source for months and not have to worry about getting too far out of sync, or be in need of functionality or bug fixes? That was one of the things that made the ZFS port possible. It was possible to take a known-good, "complete", working snapshot as a base and focus on getting it working in the FreeBSD kernel. It wasn't necessary to wonder (that much) if the bug you're currently fighting is a porting bug or an underlying ZFS bug. Of course, there's a lot more to it than that, but having a solid starting point is very important. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI6FJV "All of this is for nothing if we don't go to the stars" - JMS/B5 "If Java had true garbage collection, most programs would delete themselves upon execution." -- Robert Sewell
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