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

于 2011年09月21日 23:18, Eric Blake 写道:
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

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




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