linux-kernel - Re: [Xen-devel] [PATCH RFC 12/12] xen-block: implement indirect descriptors

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Message-ID: <20130305141610.GF2589@phenom.dumpdata.com>
Date:	Tue, 5 Mar 2013 09:16:10 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	roger.pau@...rix.com,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH RFC 12/12] xen-block: implement indirect
 descriptors

On Tue, Mar 05, 2013 at 08:11:19AM +0000, Jan Beulich wrote:
> >>> On 04.03.13 at 21:44, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> > <nods> 'op' sounds good. With a comment saying it can do all of the 
> > BLKIF_OPS_..
> > except the BLKIF_OP_INDIRECT one. Thought one could in theory chain
> > it that way for fun.
> 
> In fact I'd like to exclude chaining as well as BLKIF_OP_DISCARD here.
> The former should - if useful for anything - be controlled by a
> separate feature flag, and the latter is plain pointless to indirect.
> And I reckon the same would apply to BLKIF_OP_FLUSH_DISKCACHE
> and BLKIF_OP_RESERVED_1 - i.e. it might be better to state that
> indirection is only permitted for normal I/O (read/write) ops.

<nods> That makes sense. And also of course the new BLKIF_OP should
be documented in the Xen tree as well.

> 
> Jan
> 
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