Re: [PATCH v3 COLOPre 21/26] tools/libxl: refactor write stream to support back channel

[Ian Campbell <ian.campbell@citrix.com>]

On Wed, 2015-07-01 at 13:33 +0800, Wen Congyang wrote:
> On 06/30/2015 06:28 PM, Ian Campbell wrote:
> > On Thu, 2015-06-25 at 14:25 +0800, Yang Hongyang wrote:
> >> From: Wen Congyang <wency@cn.fujitsu.com>
> > 
> > Refactor how?
> > 
> > (Tip: In general no change can be sufficiently described in just the
> > subject line unless it is absolutely the most trivial possible one).
> > 
> > It looks like mostly checkpoint_callback is renamed to
> > write_records_callback and the type of its argument and that of
> > completion_callback changed. But why?
> 
> checkpoint callback just write a record and return to the caller.
> For back channel, we also write a record from secondary to primary.
> So I rename it to write_records_callback.
> 
> In secondary side, there is no libxl__domain_save_state, so I change
> the argument: use stream instead of dss. The caller can use container_of()
> to get dss.
> 
> The back channel only needs this feature: use the read/write stream to read
> and write record.

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