block/dirty-bitmap: Add bdrv_dirty_iter_next_area
This new function allows to look for a consecutively dirty area in a dirty bitmap. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NJohn Snow <jsnow@redhat.com> Message-id: 20180613181823.13618-10-mreitz@redhat.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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