Date: Sat, 25 Jun 2005 16:13:20 +0200 From: Philip Paeps <philip@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: Unable to umount union-parts after umounting unionfs Message-ID: <20050625141320.GA605@fasolt.home.paeps.cx> In-Reply-To: <20050623142117.GE738@obiwan.tataz.chchile.org> References: <20050622065357.GA694@loge.nixsys.be> <20050623083804.GV738@obiwan.tataz.chchile.org> <20050623104843.GA698@loge.nixsys.be> <20050623142117.GE738@obiwan.tataz.chchile.org>
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On 2005-06-23 16:21:17 (+0200), Jeremie Le Hen <jeremie@le-hen.org> wrote:
> > > Could you show us the locked vnodes for these two cases please ?
> >
> > Is there any way I can either try to unmount the filesystem manually from
> > the debugger or make the unmounting code more chatting about what it's
> > waiting for?
>
> I don't think that having a snapshot of locked vnode when union_unmount() is
> called would inform us further. However, I you want to try, you just have
> to drop to DDB, set a breakpoint on union_unmount() (typing "break
> union_unmount") and then try the unmount (you can delete the breakpoint by
> simply using "delete union_unmount").
Note that the problem is not in unmounting the union filesystem, that works
fine, it's unmounting the top layer. Unmounting the bottom layer is not a
problem either.
> One thing you can do is compiling your kernel with DIAGNOSTIC enabled
> and set the sysctl debug.busyprt to 1. This will print informations on
> each busy vnode when you will be trying to unmount the filesystem :
Aha:
%%%
vflush: busy vnode
0xc2578bb0: tag ufs, type VDIR
usecount 1, writecount 0, refcount 4 mountedhere 0
flags (VV_ROOT)
VI_LOCKed v_object 0xc256c630 ref 0 pages 1
lock type ufs: EXCL (count 1) by thread 0xc2547900 (pid 687)
ino 2, on dev md1
%%%
- Philip
--
Philip Paeps Please don't Cc me, I am
philip@freebsd.org subscribed to the list.
BOFH Excuse #242:
Software uses US measurements, but the OS is in metric...
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