From mboxrd@z Thu Jan  1 00:00:00 1970
From: keith.busch@linux.intel.com (Keith Busch)
Date: Mon, 7 May 2018 09:14:42 -0600
Subject: BLKZEROOUT ioctl and WriteZero opcode
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References: <CAPrnrPDEdOFKxuZNQo_BhY8Nf2MfcB=DgbzDEDV7JHx5_+-gnQ@mail.gmail.com>
 <20180504200556.GA20686@localhost.localdomain>
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Message-ID: <20180507151442.GC20686@localhost.localdomain>

On Mon, May 07, 2018@03:17:56PM +0300, Eyal BenDavid wrote:
> Thanks Keith,
> 
> So:
> BLKZEROOUT is not implemented by NVME passthru + Write Zeroes (for now).
> BLKZEROOUT Is implemented by DSM provided the device guarantees 0's
> are returned after "Unmap"
> In order to to zero out a range, NVMe passthru with Write Zeroes
> opcode must be used.
> 
> Is it correct?

Yes, that is correct.