block: Support meta dirty bitmap
The added group of operations enables tracking of the changed bits in the dirty bitmap. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NJohn Snow <jsnow@redhat.com> Message-id: 1476395910-8697-5-git-send-email-jsnow@redhat.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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