Date: Tue, 17 Jul 2001 12:14:17 +0200 (CEST) From: =?iso-8859-1?q?m=20p?= <sumirati@yahoo.de> To: Greg Lehey <grog@FreeBSD.org> Cc: jasonf@citynet.net, freebsd-fs@freebsd.org Subject: Re: Porting a new filesystem to FreeBSD Message-ID: <20010717101417.58152.qmail@web13304.mail.yahoo.com> In-Reply-To: <20010717180109.V70499@wantadilla.lemis.com>
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--- Greg Lehey <grog@FreeBSD.org> schrieb: > On Tuesday, 17 July 2001 at 10:22:10 +0200, m p > wrote: > > Hi, > > > > let it be technical again. > > > > I wanted to do a little bit more research before > > bringing up the idea of porting the GPLed version > of > > JFS to *BSD. But now is better than else. > > > > JFS would be a nice thing for > > mail/database/http/file-servers. I can not state > "that > > filesystem is better than this". But a filesystem > > developed by a big company to use it with linux - > why > > do we not port it? > > Well, there's a significant amount of effort > involved, for one thing. > BSD kernel internals are very different from Linux. > But if you want > to work on it, I can offer official support. > > > Things i wanted to research before starting it: > > 1) Is there anybody doing it and needing help? > > Not that I know of. > > > 2) What filesystem/booting-process/lvm-stuff is > under > > development in -current? > > Vinum root file systems are just a SMOP away. I had > it running over a > year ago, but didn't have time to make some minor > modifications. In a statement (i don't remember where; a quick google search i didn't found it) a road-plan was described. It mentioned a project hosted at www.freebsd/~??? (it was three letters i rember). There was a new layout for volumes and the boot process described. > > > 3) How do i have to modify the kernel to support > JFS? > > (or modify the linux kernel wrapper) > > It's certainly more than modifying the Linux kernel > wrapper. It's too > early to guess exactly how much work it might be. > > > 4) How do i kernel programming (if needed)? > > I don't understand this question. I had never done kernel hacking before. (Perhaps the sentence above would read better this way: how do i do porgramming at the kernel level "the right way" tm?) And yes, i will buy the book mentioned by Kris Kennaway some days ago at freebsd-questions " Design and Implementation of the 4.4BSD Operating System". Is there another good source about kernel hacking? > > > 5) What _exactly_ is a filesystem? > > Well, I would think you would understand this > already. Or maybe I'm > misunderstanding your point. I don't know much about concepts behind that word. What _exactly_ means journaling? How is made sure, that the log-files to replay the action are consistent? etc. I heard about filesystems a little bit. It is a way to learn more about them. But to know more about that will make the work easier. > > > When these points are clear (worst case i have to > do a research on > > all 5, best case only on point 1) i will start the > project. > > > > Is there any big step i missed during > brainstorming? > > Well, maybe the magnitude of the project. It's not > easy, and even the > recently released Linux version of the file system > has significant > "issues". As i mentioned: i've got plenty of time the next year working under the week somewhere else and living in a motel. No people i knew nearby. So coding will prevent me from looking to much tv. :) Marc > > Greg > -- > See complete headers for address and phone numbers __________________________________________________________________ Do You Yahoo!? Gesendet von Yahoo! Mail - http://mail.yahoo.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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