Date: Thu, 24 Jul 2008 17:17:52 +0200 From: "Attilio Rao" <attilio@freebsd.org> To: "Rink Springer" <rink@freebsd.org> Cc: Lothar Braun <lothar@lobraun.de>, freebsd-current@freebsd.org Subject: Re: panic: __lockmgr_args: unknown lockmgr request 0x0 Message-ID: <3bbf2fe10807240817l7aedc58fnf56e54155d7beda7@mail.gmail.com> In-Reply-To: <20080723153849.GA5117@rink.nu> References: <487F32C6.5030502@lobraun.de> <3bbf2fe10807171306y59d30b13y868c1e27697412a7@mail.gmail.com> <48805EEE.90109@lobraun.de> <48806684.4000908@FreeBSD.org> <4880921C.10700@lobraun.de> <3bbf2fe10807190827k24c738c9s4f258ac006035b75@mail.gmail.com> <48833C50.8030507@lobraun.de> <3bbf2fe10807200904y32cc6d04n94bc262aa3c6c2be@mail.gmail.com> <3bbf2fe10807200926k5aa8fd2an7b2689f92bbba05d@mail.gmail.com> <20080723153849.GA5117@rink.nu>
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2008/7/23 Rink Springer <rink@freebsd.org>: > On Sun, Jul 20, 2008 at 06:26:04PM +0200, Attilio Rao wrote: >> 2008/7/20, Attilio Rao <attilio@freebsd.org>: >> > 2008/7/20, Lothar Braun <lothar@lobraun.de>: >> > >> > > Hi Attilio, >> > > >> > > >> > > >> > > > can you please try this on the top of -CURRENT: >> > > > http://www.freebsd.org/~attilio/xfs2.diff >> > > > >> > > >> > > Thank you for the patch. The panic and the dead lock disappeard, but there >> > > is a new problem insteed. The commands >> > > >> > > mkfs.xfs /dev/ad8s4 >> > > mount -t xfs /dev/ad8s4 /home >> > > mkdir /home/lothar >> > > chown lothar:lothar /home/lothar >> > >> > >> > For what I remind, it is likely XFS is still not ready for writing. >> > This means you should only use it in read-only. >> >> Speaking of which, I think we should mark it again like a read-only fs >> until writing is not 100% ready. > > NTFS suffers from the same issue; it 'kind of' supports writes. The > result is that it supports writes in so limited circumstances that the > write support is mostly useless (and it even tends to lead to panics...) > > I think a better solution is to mount such filesystems r/o by default, > and only mount them r/w if explicitely asked to do so, for example by '-o > rw' - it would make things a lot clearer for our users when trying to > use filesystems, and brave souls are always welcome to force r/w that > way. > > What do you think? As long as you state that the write support is almost useless, I think the better thing is that we should simply drop the write support for the moment (and leaving the implementation there, of course, so that interested hackers can keep solidifying the support). Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein
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