Re: [PATCH v8] virtio_blk: add discard and write zeroes support

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On 15/10/2018 11:27, Christoph Hellwig wrote:
> There is some issues in this spec.  For one using the multiple ranges
> also for write zeroes is rather inefficient.  Write zeroes really should
> use the same format as read and write.

What makes it inefficient?

> Second the unmap flag isn't properly specified at all, as nothing
> says the device may not unmap without the unmap flag.  Please take
> a look at the SCSI or NVMe ѕpec for some guidance.

Thanks, I'll submit a patch for this.

Paolo



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