On Fri, 2005-05-06 at 16:01, Kip Macy wrote: > On Fri, 6 May 2005, David Parfitt wrote: > > > Hi - > > 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. > > > I can't speak for user-space utilities, but using xen as a development > environment would dramatically shorten the panic and reboot cycle. In > addition, > you don't require a 2nd machine to debug with GDB. Just a thought. If booting > Linux makes you itch, NetBSD support for acting as the control plane is > supposed > to be stable.
I agree. I used this approach with vmware a while ago and was more than happy. >From what I see xen reboots are even faster (I only tried Xen with NetBSD and linux so far). Hopefully Kip's work will make it into current before I need a setup like this for FreeBSD. An alternative would be a fast booting second machine with PXE (network) booting. (real server hardware takes forever to boot - use consumer boxes without ECC memory,SCSI, memory test,...) Things have changed a bit since UFS was developed making development in user space more difficult due to extra functionality that would need to be ported/emulated to/in user space. There is also no pressure to do this since development in kernel space is so much easier these days. This being said I highly recommend writing user space test applications that integrate modules/functions from your FS whenever possible. Stephan _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
