[Samba] fcntl lock failed at large offset: pretty urgent

[Jim Thomas]

On Wed, Dec 03, 2003 at 12:53:44AM +0000, Jeremy Allison wrote:
>On Tue, Dec 02, 2003 at 07:47:50PM +1100, Jim Thomas wrote:
>> Debian Woody with security updates
>> Linux kernel 2.2.25
>> Samba 3.0.0
>> libc6 2.2.5
>> 
>> [2003/12/02 17:20:23, 3] lib/util.c:fcntl_lock(1632)
>>   fcntl_lock: fcntl lock gave errno 75 (Value too large for defined data type)
>> [2003/12/02 17:20:23, 3] lib/util.c:fcntl_lock(1651)
>>   fcntl_lock: lock failed at offset 4294967284 count 1 op 13 type 1 (Value too large for defined data type)
>> [2003/12/02 17:20:23, 3] smbd/error.c:error_packet(94)
>>   error string = Value too large for defined data type
>> 
>> What I think is happening is the client is passing a number
>> greater than 2^31 as the lock range, which will fail according to
>> http://samba.org/samba/docs/man/locking.html#id2918968 which states
>> that samba locks from 0-2^31, whereas windows issues lock requests up
>> to 2^32 or 2^64.
>> 
>> Setting "locking = no" fixes the problem, but will cause others as these
>> files are used by many people at once.

>If Samba is configured to use 64 bit filesystems it assumes it
>can lock from 0 to 2^63-1 - the code in locking/posix.c in posix_fcntl_lock()
>takes care of this. If it is configured to use 32 bit filesystems
>it assumes it can lock from 0 to 2^31-1.
>
>Samba will truncate the posix lock above these limits as no posix
>application will ever see such a lock. You might get this problem
>if you're running a 64-bit Samba gatewaying onto a 32-bit mounted
>NFS mount, or other mounted partition.
>
>Can you give more details about the setup please ? This code has been
>stable and working for quite a long time now.

Thanks for your reply, Jeremy, this looks solvable, it sounds like
configuration at my end.

More info of setup: 
The version of Samba I have is a precompiled Debian package, and
downloaded from the site referred to by www.samba.org

http://samba.mirror.aarnet.edu.au/samba/ftp/Binary_Packages/Debian/samba3/dists/stable/main/binary-i386

I'm not sure what the build options were for this, but I will try and
find out.

When you say Samba can be configured to use 64 bit filesystems, is this
a compile time option?  Is there a way of checking if the version I have
has this enabled?  Perhaps I should build from source.

The setup is:
  Linux samba 3.0.0 server, serving files from local disk
  Win95,98,xp-pro clients mounting smb shares as a workgroup
  Windows software that wants to set a lock at 2^32-16

do you need more information, eg smb.conf?

Cheers, Jim