Re: [Qemu-devel] [PATCH v4 2/8] block: add basic backup support to block driver

[Paolo Bonzini <pbonzini@redhat.com>]

Il 22/05/2013 11:38, Kevin Wolf ha scritto:
>> +
>> +        DPRINTF("brdv_co_backup_cow done C%" PRId64 "\n", start);
>> +    }
>> +
>> +out:
>> +    if (bounce_buffer) {
>> +        qemu_vfree(bounce_buffer);
>> +    }
>> +
>> +    cow_request_end(&cow_request);
>> +
>> +    qemu_co_rwlock_unlock(&job->flush_rwlock);
>> +
>> +    return ret;
>> +}
>> +
>> +static void coroutine_fn backup_before_write_notify(Notifier *notifier,
>> +                                                    void *opaque)
>> +{
>> +    BdrvTrackedRequest *req = opaque;
>> +    backup_do_cow(req->bs, req->sector_num, req->nb_sectors);
>> +}
> 
> I don't think you can ignore errors here. Not sure if we can stop the VM
> and resume later or something like that, but if we can't, the backup
> will be invalid and we must fail the job.

Yes, there is rerror/werror machinery for jobs that this patch is not using.

Paolo