CIFS cuts off end of file

Question

I have a Windows 2003 Enterprise SP2 server, on which I am sharing a folder. In the folder is a file that I am trying to read and import the data on a SLES 11 SP1 server. If I view the file on the Windows server, I can see the entire file. If I view the file on my Windows 7 PC, I can see the entire file. So I think the sharing is fine, since I can view the file on my PC. However, when I have the share mounted on the SLES server using cifs, the file sometimes has part of the last line cut off. Is there some configuration change I need to make (either on the Windows side or on the SLES side)?

Answer 1

The problem was with the CIFS mount becoming disconnected and not properly re-connecting or trying to use a cache.

The solution was to add "forcedirectio" to the line in /etc/fstab (based on reading http://www.cyberciti.biz/tips/disable-caching-on-the-cifs-nfs-client.html).

To answer Banjer's questions: If I used smbget to download the file, it read correctly.

After reading http://en.opensuse.org/openSUSE:Bugreport_Samba#Debugging_cifs_vfs_client I looked at /proc/fs/cifs/DebugData and was able to catch one time where it said it was disconnected.