Re: [Vserver] mountpoints blocked - reloaded

From: Herbert Poetzl <herbert_at_13thfloor.at>
Date: Fri 17 Feb 2006 - 23:38:02 GMT
Message-ID: <20060217233802.GB30682@MAIL.13thfloor.at>

On Fri, Feb 17, 2006 at 01:50:41PM +0100, Oliver Welter wrote:
> Hi Folks, Hi Bertl,
>
> the problem which seemed to be solved re-appeard today with recent
> kernel patches (2.6.15-gentoo-r4-vs2.1.1-rc6)
>
> To reconstruct the problem
> 1) add a drbd blockdevice to the guests fstab
> 2) start and stop guest
> 3) try to unmount the device
> you get an error, telling that the drbd device is still mounted...
>
> So - any ideas ??

okay, just as update, we tracked this down to
the fact that even mainline 2.6.15/2.6.16-rc3
does not release ext3 filesystems properly
when the namespace is destroyed ... this can
be easily verified with a mainline kernel and
the following command sequence:

 vnamespace --new -- mount /dev/hda1 /mnt

(assuming that /dev/hda1 contains an ext3 fs
and /mnt exists, this will claim hda1 but not
release it -- it works fine with ext2 though)

now investigating ...

best,
Herbert

> I am sure that there are no other contexts running, the maschine was
> booted freshly before doing the above steps and the testsystem was the
> only running guest
>
> Oliver
> --
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