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Instead of modifying the new BDS after it has been opened, use the newly supported 'detect-zeroes' option in bdrv_open_common() so that all requirements are checked (detect-zeroes=unmap requires discard=unmap). Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>