[Samba] Samba 4 slow write

[Jones Syue]

Hello Ervin,

Hmm looks like my earlier patch does not help this case at all,
thank you for great feedback.

Found another difference between samba-{3, 4} is
the code flow of open_file(),
my next plan is dig this further hmm might take a bit time,
will get back to list later.

--
Regards,
Jones Syue | 薛懷宗
QNAP Systems, Inc.

> The conclusion is this patch didn't resolved my
> problem, the running time is very similar as before.
>
> So, how can I go away to resolve my slow write problem?
> ...
>
> % time     seconds  usecs/call     calls    errors syscall
> ------ ----------- ----------- --------- --------- ----------------
>  15.80   14.789129           4   4010639           getegid
>  15.67   14.661022           4   4010648           geteuid
> ...