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由 Christoph Hellwig 提交于
The SCSI passthrough idea was a a bad idea to start with (guess who came up with it?), and has been removed from the virtio 1.O spec, and is not enabled by defauly by any host I know of. Add a separate config option for it so that we don't need to enable it for most setups. That way any bugs related to it (like the one recently fixed for vmapped stacks) do not affect other users, and the size of the virtblk_req structure also shrinks significantly. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@fb.com>
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