[libvirt] [PATCH] storage: Wait udev events are handled before removing lvm vol

Eric Blake eblake at redhat.com
Wed Sep 21 15:18:00 UTC 2011

On 09/21/2011 12:52 AM, Osier Yang wrote:
> Related #BZ: https://bugzilla.redhat.com/show_bug.cgi?id=702260.
> There are two problems described in the BZ:
> 1) "Can't remove open logical volume".
> 2) "Unable to deactivate logical volume "foo""
> This patch just intends to fix 2), as 1) is expected if the vol
> is still used by something, and you never known if "lvchange -an"
> will fail or not either (sometime, it will succeed, sometimes not).
> We'd better not look for trouble, :-)
> For 2), that's caused by race between lvremove and udev event handling,
> the only workable way now is to wait the events handling are finished,
> though it might introduce latencies, as "udevadmin settle" exits
> after *all* events are handled, it's the only way we can fix
> the racing in libvirt layer.
> See https://bugzilla.redhat.com/show_bug.cgi?id=570359 for more
> details.

In particular, https://bugzilla.redhat.com/show_bug.cgi?id=570359#c28 is 
the recommendation to use 'udevadm settle' prior to lvremove.


Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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