Re: [Qemu-devel] [PATCH v3 1/5] nbd/server: fix trace

[Eric Blake <eblake@redhat.com>]

On 05/23/2018 05:24 AM, Vladimir Sementsov-Ogievskiy wrote:
> Return code = 1 doesn't mean that we parsed base:allocation. Move
> trace point to appropriate place.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>   nbd/server.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 

> @@ -768,10 +771,10 @@ static int nbd_meta_base_query(NBDClient *client, NBDExportMetaContexts *meta,
>       }
>   
>       if (strncmp(query, "allocation", alen) == 0) {
> +        trace_nbd_negotiate_meta_query_parse("base:allocation");
>           meta->base_allocation = true;
>       }

It's probably worth tracing even when we successfully skip the request, 
as in:

if (strncmp...) {
     trace_nbd_negotiate_meta_query_parse("base:allocation");
     meta->base_allocation = true;
} else {
     trace_nbd_negotiate_meta_query_skip("unrecognized request %s", query);
}

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org