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Kevin Wolf authored
Use the same function as bdrv_open() for determining what the right flags for bs->file are. Without doing this, a reopen means that bs->file loses BDRV_O_CACHE_WB or BDRV_O_UNMAP if bs doesn't have it as well. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
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