[vserver] XFS read-only bind mount issue

From: Eric Schoeller <eschoeller_at_users.sourceforge.net>
Date: Thu 01 Apr 2010 - 04:15:51 BST
Message-ID: <4BB40FE7.1040908@users.sourceforge.net>

Good Evening,

I have an interesting problem that apparently seems to be vserver
related. I have an XFS filesystem on a Debian Lenny host that I bind
mount on several linux-vserver guests, all running Debian Lenny as well.
Some guests bind mount this filesystem read-only, others read-write.
After a clean reboot, all guests and the host O/S have no trouble
accessing this filesystem. Once I restart a guest which bind mounts this
filesystem read-only the entire host no longer has read/write access. I
see nothing in dmesg or syslog about this apparent "re-mount read-only"

To fix this issue, I have to stop all guests that have this fileystem
bind-mounted, unmount it from the host O/S and then re-mount it. Once I
fire up a single guest with the read-only bind-mount, the problem occurs
again. Now, if I switch one of these read-only guests to bind-mount
read/write the problem is resolved. If it's not a vserver issue (which
is entirely likely) any hint on where else I should be looking is
greatly appreciated.

I first observed this problem after an upgrade to
which I built myself. After reading about various XFS issues in "recent"
kernels I tried using an image from the psand repository: I still observe the same behavior. Up
until this recent upgrade I had been using the debian etch kernel
2.6.18-6-vserver-amd64. Oddly, switching back to this kernel doesn't
resolve the issue, so perhaps it's not vserver related at all ... or it
could be util-vserver related. I haven't tried changing my util-vserver
version yet.


Received on Thu Apr 1 04:16:09 2010

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