samba - May 2011 - Microsoft Outlook pst files unable to open or create

All,

I sent a message for help a couple of weeks ago about a samba migration
issue.  With further testing, we have isolated the issue to Microsoft
Outlook (versions 2007 and 2010).  All other applications have no issues
when they mount the new samba server reading, writing, etc.  But, in
Outlook, when you try to open an archive (pst file) on the new samba
server, it pops up an error "the file is already in use by the maximum
number of applications.  Close some of these applications and try again.
You may need to restart your computer."  Nothing esle has the file open.
So to test, we tried to create a new archive file that does not
currently exist on the server, and it gives you the same error and fails
to create the file.  If we unmount from the new samba server to the old
one, it can create it just fine.  Please help anyone, I'm at a complete
loss where to go from here!

Sincerely,

Doug Tucker

What is your samba ver. Number????
Do you use exchange??
There are the same error like yours with ost files and caching.
This seems a bug in outlook(2007-2010) not in samba!??
I myself have a small group of Outlook-xp-pst files on samba 3.5.8 without
any errors. I have
a redirection of domain-users to samba home share.

-----------------------------------------------
EDV Daniel M?ller

Leitung EDV
Tropenklinik Paul-Lechler-Krankenhaus
Paul-Lechler-Str. 24
72076 T?bingen

Tel.: 07071/206-463, Fax: 07071/206-499
eMail: mueller at tropenklinik.de
Internet: www.tropenklinik.de
-----------------------------------------------
-----Urspr?ngliche Nachricht-----
Von: samba-bounces at lists.samba.org [mailto:samba-bounces at lists.samba.org]
Im
Auftrag von Doug Tucker
Gesendet: Montag, 9. Mai 2011 16:05
An: samba at lists.samba.org
Betreff: [Samba] Microsoft Outlook pst files unable to open or create

All,

I sent a message for help a couple of weeks ago about a samba migration
issue.  With further testing, we have isolated the issue to Microsoft
Outlook (versions 2007 and 2010).  All other applications have no issues
when they mount the new samba server reading, writing, etc.  But, in
Outlook, when you try to open an archive (pst file) on the new samba
server, it pops up an error "the file is already in use by the maximum
number of applications.  Close some of these applications and try again.
You may need to restart your computer."  Nothing esle has the file open.
So to test, we tried to create a new archive file that does not
currently exist on the server, and it gives you the same error and fails
to create the file.  If we unmount from the new samba server to the old
one, it can create it just fine.  Please help anyone, I'm at a complete
loss where to go from here!

Sincerely,

Doug Tucker

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Doug,

I had the same problem. Unfortunately getting rid of the bogus SMB<->NFS
proxy approach was no option.
The solution was a kernel patch found on a Samba mailing list (don't recall
which one, a couple of years old IIRC).

Here's the patch as it will apply to a RHEL5/CentOS5 kernel:

--- a/fs/nfs/file.c     2011-02-22 12:49:27.000000000 +0100
+++ b/fs/nfs/file.c     2011-02-22 13:14:57.000000000 +0100

@@ -653,10 +653,16 @@
         * Not sure whether that would be unique, though, or whether
         * that would break in other places.
         */
-       if (!(fl->fl_flags & FL_FLOCK))
+
+       /**
+       * Don't simulate flock() using posix locks, as they appear to
collide with
+       * legitimate posix locks from the same process.
+       */
+       if (fl->fl_flags & FL_FLOCK)
                return -ENOLCK;

        /* We're simulating flock() locks using posix locks on the server */
+       /* ...except we shouldn't get here, due to the above patch. */
        fl->fl_owner = (fl_owner_t)filp;
        fl->fl_start = 0;
        fl->fl_end = OFFSET_MAX;

I downloaded the kernel source rpm, installed it and put the patch into a file
in the /usr/src/redhat/SOURCES directory.
Then I modified the /usr/src/redhat/SPECS/kernel-2.6.spec file to apply the
patch and ran
rpmbuild -ba kernel-2.6.spec
The kernel RPMs created are in /usr/src/redhat/RPMS/<architecture>

Mail me if you need details regarding this procedure...

Uli