Am 20.07.2011 21:49, schrieb tip-bot for Pekka Enberg: > Commit-ID: 4839bcd6b04a1b628f0f00d535ddca2ee872e9fa > Gitweb: http://git.kernel.org/tip/4839bcd6b04a1b628f0f00d535ddca2ee872e9fa > Author: Pekka Enberg <penberg@xxxxxxxxxx> > AuthorDate: Wed, 20 Jul 2011 16:28:31 +0300 > Committer: Pekka Enberg <penberg@xxxxxxxxxx> > CommitDate: Wed, 20 Jul 2011 16:28:31 +0300 > > kvm tools, qcow: Fix copy-on-write image corruption > > We don't handle refcount table properly so make sure we only write to clusters > that have the "copied" flag set. > > Cc: Kevin Wolf <kwolf@xxxxxxxxxx> > Cc: Sasha Levin <levinsasha928@xxxxxxxxx> > Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxx> Hm, I must have missed this patch on the KVM mailing list... You should also error out before creating a new L2 table as its refcount would have to be updated, too. On the other hand, the patch is a bit too restrictive, because it applies the check to qcow1 which doesn't even have a refcount table. I'm not sure if everyone is aware of it, so another hint: Now that you can't grow qcow2 any more, you might find it useful to use qemu-img create -f qcow2 -o preallocation=metadata, so that all clusters are already present and you don't get random failures. Kevin -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
