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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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@xxxxxxxxxx> 
> >>> 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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