linux-kernel - Re: [Xen-devel] [PATCH 3/3] xen/blk[front|back]: Enhance discard support with secure erasing support.

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Message-ID: <1318320575.21903.490.camel@zakaz.uk.xensource.com>
Date:	Tue, 11 Oct 2011 09:09:35 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Dong Yang Li <lidongyang@...e.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 3/3] xen/blk[front|back]: Enhance	 discard
 support with secure erasing support.

On Tue, 2011-10-11 at 08:36 +0100, Jan Beulich wrote:
> >>> On 10.10.11 at 21:57, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> > On Mon, Oct 10, 2011 at 08:20:02PM +0100, Ian Campbell wrote:
> >> On Mon, 2011-10-10 at 17:42 +0100, Konrad Rzeszutek Wilk wrote:
> >> > On Mon, Oct 10, 2011 at 05:13:07PM +0100, Ian Campbell wrote:
> >> 
> >> > > In any case it should also be posted against the canonical inter-guest
> >> > > interface definition in the xen tree for review with that in mind.
> >> > 
> >> > Yes! But I was thinking to first let this one rattle a bit and see what
> >> > folks thought about it before submitting the xen-devel.
> >> 
> >> It's a good idea to get ABI changes out for review before the
> >> implementation rattles around so much that changing it becomes hard.
> > 
> > OK, lets drop this until we get that straigthen out. I've posted
> > http://lists.xensource.com/archives/html/xen-devel/2011-10/msg00642.html the 
> > changes to
> > Xen ABI.
> 
> Yeah, but that didn't get adjusted after IanC's comments (structure
> alignment, BLKIF_OP_DISCARD_FLAG_SECURE value).
> 
> Further I wonder why you don't use the "reserved" field instead of
> extending the structure at the end.

I hadn't noticed that field, yes using that would be preferable since it
retains ABI compatibility.

> 
> Jan
> 


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