Re: [PATCH 03/10] tools/xenstore: Don't assume conn->in points to the LU request

[Luca Fancellu <luca.fancellu@xxxxxxx>]

> On 24 Jun 2021, at 08:34, Juergen Gross <jgross@xxxxxxxx> wrote:
> 
> On 24.06.21 09:32, Juergen Gross wrote:
>> On 16.06.21 16:43, Julien Grall wrote:
>>> From: Julien Grall <jgrall@xxxxxxxxxx>
>>> 
>>> call_delayed() is currently assuming that conn->in is NULL when
>>> handling delayed request. However, the connection is not paused.
>>> Therefore new request can be processed and conn->in may be non-NULL
>>> if we have only received a partial request.
>>> 
>>> Furthermore, as we overwrite conn->in, the current partial request
>>> will not be transferred. This will result to corrupt the connection.
>>> 
>>> Rather than updating conn->in, stash the LU request in lu_status and
>>> let each callback for delayed request to update conn->in when
>>> necessary.
>>> 
>>> To keep a sane interface, the code to write the "OK" response the
>>> LU request is moved in xenstored_core.c.
>>> 
>>> Fixes: c5ca1404b4 ("tools/xenstore: add support for delaying execution 
> 
>>> of a xenstore request")
>>> Fixes: ed6eebf17d ("tools/xenstore: dump the xenstore state for live 
>>> update")
>>> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
>> With dropping the conn parameter from call_delayed as already
>> mentioned by Luca you can add my:
> 
> Oh, please drop my request to delete the conn parameter, as it is being
> used in patch 4 again.
> 
>> Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
> 
> This stands, of course.

Hi Juergen,

I’m sorry but I don’t see when the parameter is used, in patch 4 we have this 
call:

line 2344:
        if (delayed_requests) {
            list_for_each_entry(conn, &connections, list) {
                struct delayed_request *req, *tmp;

                list_for_each_entry_safe(req, tmp,
                             &conn->delayed, list)
                    call_delayed(conn, req);
            }
        }

But call_delayed is still this one:

Line 273:
static void call_delayed(struct connection *conn, struct delayed_request *req)
{
    if (req->func(req)) {
        undelay_request(req);
        talloc_set_destructor(req, NULL);
    }
}

Am I missing something?

Cheers,
Luca

> 
> 
> Juergen
> <OpenPGP_0xB0DE9DD628BF132F.asc>