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由 Max Reitz 提交于
As part of the required changes, this fixes a bug where specifying an invalid driver would result in the block layer probing the image format; now it will result in an error, unless "<unset>" is specified as the driver name. Fixing this would require further work on the xen_disk code which does not seem worth it (at this point and for this patch). Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Message-id: 1423162705-32065-7-git-send-email-mreitz@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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