Re: [Xen-devel] [PATCH v2 COLOPre 01/13] libxc/restore: fix error handle of process_record

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 08/06/15 10:37, Yang Hongyang wrote:
>
>
> On 06/08/2015 05:24 PM, Andrew Cooper wrote:
>> On 08/06/15 04:43, Yang Hongyang wrote:
>>> If the err is RECORD_NOT_PROCESSED, and it is an optional record,
>>> restore will still fail. The patch fix this.
>>>
>>> Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
>>> CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
>>> CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
>>> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
>>> CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>> ---
>>>   tools/libxc/xc_sr_restore.c | 28 ++++++++++++++--------------
>>>   1 file changed, 14 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/tools/libxc/xc_sr_restore.c b/tools/libxc/xc_sr_restore.c
>>> index 9e27dba..2d2edd3 100644
>>> --- a/tools/libxc/xc_sr_restore.c
>>> +++ b/tools/libxc/xc_sr_restore.c
>>> @@ -560,19 +560,6 @@ static int process_record(struct xc_sr_context
>>> *ctx, struct xc_sr_record *rec)
>>>       free(rec->data);
>>>       rec->data = NULL;
>>>
>>> -    if ( rc == RECORD_NOT_PROCESSED )
>>> -    {
>>> -        if ( rec->type & REC_TYPE_OPTIONAL )
>>> -            DPRINTF("Ignoring optional record %#x (%s)",
>>> -                    rec->type, rec_type_to_str(rec->type));
>>
>> You would be best setting rc to 0 here, rather than moving the logic out
>> of process_record().
>
> There will be another error type in COLO, which indicates a failover,
> that
> needs to be handled in restore(), so I moved the error handling down to
> avoid duplex code...Otherwise, in process_record, RECORD_NOT_PROCESSED is
> handled, and in restore another error type returned from
> process_record is
> handled...

Ah ok - I will wait till I get that far through the series.

~Andrew

>
>>
>> ~Andrew
>>
>>> -        else
>>> -        {
>>> -            ERROR("Mandatory record %#x (%s) not handled",
>>> -                  rec->type, rec_type_to_str(rec->type));
>>> -            rc = -1;
>>> -        }
>>> -    }
>>> -
>>>       return rc;
>>>   }
>>>
>>> @@ -678,7 +665,20 @@ static int restore(struct xc_sr_context *ctx)
>>>           else
>>>           {
>>>               rc = process_record(ctx, &rec);
>>> -            if ( rc )
>>> +            if ( rc == RECORD_NOT_PROCESSED )
>>> +            {
>>> +                if ( rec.type & REC_TYPE_OPTIONAL )
>>> +                    DPRINTF("Ignoring optional record %#x (%s)",
>>> +                            rec.type, rec_type_to_str(rec.type));
>>> +                else
>>> +                {
>>> +                    ERROR("Mandatory record %#x (%s) not handled",
>>> +                          rec.type, rec_type_to_str(rec.type));
>>> +                    rc = -1;
>>> +                    goto err;
>>> +                }
>>> +            }
>>> +            else if ( rc )
>>>                   goto err;
>>>           }
>>>
>>
>> .
>>
>


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