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This enables its use for nested child nodes. The compatibility between the 'discard' and 'detect-zeroes' setting is checked in bdrv_open_common() now as the former setting isn't available before calling bdrv_open() any more. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>