Date: Tue, 9 Nov 1999 09:45:55 +0100 From: Jan Pechanec <pechy@hp735.cvut.cz> To: Mats Lofkvist <mal@algonet.se> Cc: freebsd-fs@FreeBSD.ORG Subject: Re: stupidfs - easily extensible test file systems? Message-ID: <Pine.SGI.4.05.9911090943400.5402-100000@akat.civ.cvut.cz> In-Reply-To: <y2qn1srh3lh.fsf@kairos.algonet.se>
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On 6 Nov 1999, Mats Lofkvist wrote:
>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.
I am not so experienced with FreeBSD, but SGI IRIX has
``fuser'' command. This command can find all processes that has open
files inside the mounted fs. You can easily write a script that kill
them all.
Jan.
--
Jan PECHANEC (mailto:pechy@hp735.cvut.cz)
Computing Center CTU (Zikova 4, Praha 6, 166 35, Czech Republic)
www.civ.cvut.cz, pechy.civ.cvut.cz, tel: +420 2 24352969 (fax: 24310271)
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