From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wen Congyang <wency@cn.fujitsu.com>
Subject: Re: [PATCH v5 1/6] remus: don't do failover if we don't
 have an consistent state
Date: Wed, 20 Jan 2016 08:42:13 +0800
Message-ID: <569ED7E5.2030701@cn.fujitsu.com>
References: <1453187862-24331-1-git-send-email-wency@cn.fujitsu.com>
	<1453187862-24331-2-git-send-email-wency@cn.fujitsu.com>
	<1453200519.29930.5.camel@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <1453200519.29930.5.camel@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Ian Campbell <ian.campbell@citrix.com>, xen devel <xen-devel@lists.xen.org>, Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Shriram Rajagopalan <rshriram@cs.ubc.ca>, Wei Liu <wei.liu2@citrix.com>, Changlong Xie <xiecl.fnst@cn.fujitsu.com>, Ian Jackson <ian.jackson@eu.citrix.com>, Yang Hongyang <hongyang.yang@easystack.cn>
List-Id: xen-devel@lists.xenproject.org

On 01/19/2016 06:48 PM, 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@cn.fujitsu.com>
>> ---
> 
> 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.

OK, thanks for your help

Wen Congyang

> 
> Acked-by: Ian Campbell <ian.campbell@citrix.com>
> 
> I'll give Andy a chance to comment before committing though.
> 
>> +            rc = -1;
>>          goto err;
>>  
>>      default: /* Other fatal error */
> 
> 
> .
>