[linux-cifs-client] cp -p does not preserve timestamps

[Jeff Layton]

On Sun, 2009-07-05 at 17:57 +0200, Jochen Roderburg wrote:
> Zitat von Günter Kukkukk <linux at kukkukk.com>:
> 
> > Am Sonntag, 7. Juni 2009 schrieb Jochen Roderburg:
> >> Hello list,
> >>
> >> This favourite linux-cifs error seems to be still around (or returned
> >> again lately  ;-)
> >>
> >> When I copy a file to a cifs-mounted share, in most cases the time
> >> stamps are not preserved. I see this with "cp -p" and the GNOME
> >> commander file-manager and with various combinations of Linux clients
> >> and samba servers:
> >> with Linux kernels 2.6.28 and 2.6.29, samba 3.2.7 on an IBM SoFS
> >> system (kind of huge NAS which we are about to release upon our
> >> university staff/students), samba 3.0.25 on an own NAS box (Acer
> >> EasyStore) and samba 3.3.4 on my Linux machines themselves. The
> >> problem seems to occur only with enabled CIFS Unix Extensions.
> >>
> >> I have searched in the net and the cifs archives and saw that this
> >> type of error was already discussed and repaired several times in
> >> recent years. I have found also two test programs in the archives with
> >> which I can show the error in some of the above mentioned cases. As I
> >> said it does not occur in every case which makes it kind of difficult
> >> to diagnose.
> >>
> >> What I read in the old discussions is that this issue happens in cases
> >> where file attributes (incl. timestamps) are set on open files and the
> >> subsequent file close resets them again somehow.
> >>
> >> Let me know if I can help with specific tests on my systems. I have,
> >> however, the feeling that is not difficult to reproduce the error in
> >> other environments, too.
> >>
> >> Best Regards,
> >>
> >> Jochen Roderburg
> >
> > this bug has been fixed now in 3.2.x / 3.3.x and today released  
> > 3.4.x - see also
> > https://bugzilla.samba.org/show_bug.cgi?id=6520
> >
> > Thanks for reporting! :-)
> > Cheers, Günter
> 
> Hello Günter,
> 
> Thanks for carrying this issue over to the samba side of things and  
> informing me about the results. ;-)
> I had more or less given up already. A short search in the samba  
> bugzilla brought up only one related entry and I did not have the  
> impression that anybody was actually working on it. I see the bug 6520  
> now mentioned in the just released samba 3.4. The latest 3.2/3.3  
> releases were before your new bugzilla discussion, so I think they  
> cannot appear there before another release of these.
> 
> Unfortunately the outcome of the whole case is now so that these  
> bugfixes to not help me at all with my actual problems. Changes on the  
> client side would have been more helpful, because I could apply them  
> on the systems which are under my own control. I cannot change the  
> samba server on IBM's SoFS system or on my NAS boxes. so I must  
> continue with the workaround to disable the "unix extensions". I  
> decided for me that in my cases correct time-stamps are more important  
> than the other extension features. In both situations the shared file  
> store is mainly used for system-independent backups.
> 
> Best regards,
> Jochen Roderburg

You may want to test the client-side patchset I posted on Thursday:

Subject: [linux-cifs-client] [PATCH 0/3] cifs: add a SET_FILE_INFO variant that uses FILE_UNIX_BASIC_INFO infolevel

It may help this problem as well.

-- 
Jeff Layton <jlayton at redhat.com>