Date: Fri, 6 May 2005 16:37:30 -0400 From: "Kurt J. Lidl" <lidl@pix.net> To: Warner Losh <imp@bsdimp.com> Cc: freebsd-hackers@freebsd.org Subject: Re: FS impl. Message-ID: <20050506203730.GB17588@pix.net> In-Reply-To: <20050506.140135.85403237.imp@bsdimp.com> References: <3c220db005050612561d05cefa@mail.gmail.com> <20050506.140135.85403237.imp@bsdimp.com>
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On Fri, May 06, 2005 at 02:01:35PM -0600, Warner Losh wrote: > > I have been trying to write my own UFS-like filesystem > > implementation for fun. I had read somewhere that UFS was developed in > > user space (correct me if I'm wrong on that one) and then moved over > > to kernel-space. I was wondering if there are any existing facilities > > in the kernel source tree that would allow me to develop an fs in user > > space easily or with a little tweaking? As of right now, I have to > > develop, compile, panic, reboot, debug etc. which is frustrating and > > time consuming. > > Maybe you are thinking of NFS :-). You can use the same hooks that > amd and similar programs to implement your code in userland. It's pretty well known that Kirk did the 4.2 FFS implementation as a user-mode process. This statement is made directly in Luke Mewburn's paper on cross-building NetBSD: http://www.usenix.org/events/bsdcon03/tech/full_papers/mewburn/mewburn.pdf (page 9). It doesn't say in the original 4.2 FFS paper. -Kurt
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