Date: 06 Nov 1999 19:33:46 +0100 From: Mats Lofkvist <mal@algonet.se> To: freebsd-fs@freebsd.org Subject: Re: stupidfs - easily extensible test file systems? Message-ID: <y2qn1srh3lh.fsf@kairos.algonet.se> In-Reply-To: julian@whistle.com's message of "6 Nov 1999 18:49:21 %2B0800" References: <80113h$n8e$1@FreeBSD.csie.NCTU.edu.tw>
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julian@whistle.com (Julian Elischer) writes:
> On Fri, 5 Nov 1999, Jan Pechanec wrote:
> >
> > BTW, don't you know why deadfs was written? No doc in FreeBSD.
> > From what I saw in the source code, operations just fail.
> >
> When youhave a vnode open, and for some reason the filesystem the vmode
> pints to disappears (e.g. the disk is removed, or the PC-CARD is removed,
> or many other posibilties), then you cannot track down all teh users fo
> that vnode very easily, so insteadm you 'fiddle' with it to make it
> reference the DEADFS (use VGONE) and when the users try use it again they
> will safely get an error, but at least the system will
> not core-dump when they access a non existant filesyste,/device.
I guess deadfs is what makes the -f (force) flag to umount work
also, and that one is a truly great feature in FreeBSD missing in
many other unixen (e.g. solaris {and linux, I believe}).
Having to track down all processes with open descriptors on e.g.
a nfs mount before being able to umount it is a real pain in the *,
most times I give up on it and reboot the machine instead.
_
Mats Lofkvist
mal@algonet.se
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