On Mar 6, 2012, at 1:34 AM, Jan Beulich wrote:
>>>> On 05.03.12 at 22:49, Santosh Jodh <Santosh.Jodh@xxxxxxxxxx> wrote:
…
>> + }
>> +
>> /* Create shared ring, alloc event channel. */
>> err = setup_blkring(dev, info);
>> if (err)
>> @@ -889,12 +916,35 @@ again:
>> goto destroy_blkring;
>> }
>>
>> - err = xenbus_printf(xbt, dev->nodename,
>> - "ring-ref", "%u", info->ring_ref);
>> - if (err) {
>> - message = "writing ring-ref";
>> - goto abort_transaction;
>> + if (legacy_backend) {
>
> Why not use the simpler interface always when info->ring_order == 0?
Because, as I just found out today via a FreeBSD bug report, that's
not how XenServer works. If the front-end publishes "ring-page-order",
the backend assumes the "ring-refNN" XenStore nodes are in effect,
even if the order is 0.
I'm working on a documentation update for blkif.h now.
<sigh>
--
Justin
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