backup: Extract dirty bitmap handling as a separate function
This will be reused by the coming new transactional completion code. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NJohn Snow <jsnow@redhat.com> Message-id: 1446765200-3054-5-git-send-email-jsnow@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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