Does the CreateDisposition flag of a client depend on Server's response ?

[varun mittal]

I made some progress on this.
It seems the `streams_xattr` VFS module is making the difference.

On Samba-4.9.5-Debian, which was not working earlier,
once I disable this module Robocopy changes the CreateDisposition flag
and it starts working. But I could not spot the difference in traces
https://tinyurl.com/robocopy-issue


On Sat, Jan 28, 2023 at 1:33 AM Jeremy Allison <jra at samba.org> wrote:

> On Sat, Jan 28, 2023 at 01:27:36AM +0530, varun mittal wrote:
> >   > Wireshark will be the key. Compare between Windows server and Samba.
> >   That is what I thought and have started looking. Any suggestions on
> which
> >   call in particular, there are so many :)
> >   BTW, with a Windows server, the flag is FILE_OPEN_IF
>
> Well that's at the point you know there's a difference,
> so work back from that point. Try bisecting the trace
> to see where it starts to diverge. No tools for that
> so you'll have to do it by hand (something I unfortunately
> have great experience with :-).
>