Re: [Xen-devel] [PATCH v5 1/6] remus: don't do failover if we don't have an consistent state

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 19/01/16 10:48, Ian Campbell wrote:
> On Tue, 2016-01-19 at 15:17 +0800, Wen Congyang wrote:
>> We will have an consistent state when a CHECKPOINT_END record
> "a consistent ..." (and in the subject too).
>
>> is received. After the first CHECKPOINT_END record is received,
>> we will buffer all records until the next CHECKPOINT_END record
>> is received. So if the checkpoint() callback returns
>> XGR_CHECKPOINT_FAILOVER,
>> we only can do failover if ctx->restore.buffer_all_records is
>> true.
>>
>> Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
>> ---
> Please can you get into the habit of writing a delta from the previous
> version here. e.g. in this case:
>
> v5: New patch.
>
> Putting it after the --- means it doesn't go into the actual commit ("git
> am" will strip it) but it is very useful for reviewers to know what changed
> in each iteration.
>
> See also 
> http://wiki.xen.org/wiki/Submitting_Xen_Patches#Review.2C_Rinse_.26_Repeat
>
>>  tools/libxc/xc_sr_restore.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/libxc/xc_sr_restore.c b/tools/libxc/xc_sr_restore.c
>> index 05159bb..9fe2829 100644
>> --- a/tools/libxc/xc_sr_restore.c
>> +++ b/tools/libxc/xc_sr_restore.c
>> @@ -493,7 +493,11 @@ static int handle_checkpoint(struct xc_sr_context
>> *ctx)
>>          break;
>>  
>>      case XGR_CHECKPOINT_FAILOVER:
>> -        rc = BROKEN_CHANNEL;
>> +        if ( ctx->restore.buffer_all_records )
>> +            rc = BROKEN_CHANNEL;
>> +        else
>> +            /* We don't have an consistent state */
> "a" not "an" again.
>
> I can s/an/a/ in all 3 places upon commit, so no need to resend for just
> those.
>
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, with suggested
corrections

>
> I'll give Andy a chance to comment before committing though.
>
>> +            rc = -1;
>>          goto err;
>>  
>>      default: /* Other fatal error */


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