block/null: Support reopen
Reopen is used in block-commit. With this always-succeed operation, it is now possible to test committing to a null drive, by specifying "null-aio://" or "null-co://" as the backing image when creating the qcow2 image. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Message-id: 1427852740-24315-3-git-send-email-famz@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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