qemuDomainBlockPivot: Handle merging of bitmaps when pivoting an active block-commit
Active layer block commit makes the 'base' image the new top image of the disk after it finishes. This means that all bitmap operations need to be handled prior to this happening as we'd lose writes otherwise. The ideal place is to handle it when pivoting to the new image as only guest-writes would be happening after this point. Use qemuBlockBitmapsHandleCommitFinish to calculate the merging transaction. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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