linux-kernel - Re: [PATCH v6 2/4] Add support for SCT Write Same

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Date:   Wed, 24 Aug 2016 17:04:05 -0500
From:   Shaun Tancheff <shaun@...cheff.com>
To:     Tom Yan <tom.ty89@...il.com>
Cc:     Shaun Tancheff <shaun.tancheff@...gate.com>,
        linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Hellwig <hch@....de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Damien Le Moal <damien.lemoal@...t.com>,
        Hannes Reinecke <hare@...e.de>,
        Josh Bingaman <josh.bingaman@...gate.com>,
        Hannes Reinecke <hare@...e.com>
Subject: Re: [PATCH v6 2/4] Add support for SCT Write Same

On Wed, Aug 24, 2016 at 1:10 AM, Tom Yan <tom.ty89@...il.com> wrote:
> Btw, I wonder if you need to memset your buffer with 0 first, like
> what is done in ata_scsi_rbuf_get.

It is not necessary as the defined buffer is completely filled out here.

Are you thinking as a sort of future proofing?
Ex: In the unlikely event that the SCT Write Same command
descriptor is expanded in a future ACS?

It is more likely to see the command deprecated and replaced with a
new SCT feature.

Regardless of how unlikely I would consider a memset here to clear
the remainder of the payload.