[linux-cifs-client] Cannot save files on NAS

[Jeremy Allison]

On Thu, Jul 23, 2009 at 12:35:45PM -0700, Duffields wrote:
> I am a relatively new user of Ubuntu and have encounted a problem saving files 
> on an NAS device on my LAN.
> 
> Operating system Ubuntu 9.04
> Samba 2:2.2.2-1unbuntu
> smbfs and every other Ubuntu supported samba application in the repositories 
> are installed on the system. 
> 
> Device:  D-Link DNS-323 NAS using software version 1.04
> The device is auto-mounted on LAN clinet with a command in fstab, 
> The name of my local workgroup has been entered into the smb.conf file.
> There is an smbcredentials file located in my home directory. 
> 
> Problem: the NAS mounts and the client can view files, can add directories and 
> create a file on the NAS  but cannot edit and save a file located on the NAS 
> and cannot copy a file to the NAS.
> 
> When an attempt is made to save an edited file the client receives an error 
> message:
> "Could not save the file /media/RAID/A test folder/A test file.txt."
> "Unexpected error: Invalid argument"
> 
> This device works perfectly with Ubuntu 8.04 using exactly the same fstab 
> mount command which, by the way I have changed several times as suggested by 
> various people on support forums.
> 
> I contacted D-Link and they say they do not support Linux at this time but the 
> problem appears to be caused by the latest version of my OS not supporting 
> security standards used by D-Link and refer me to Ubuntu forums for a 
> solution. 
> 
> I searched Linux forums for a solution and while others have had a similar 
> problem none of the suggestions that I have received have worked on my 
> system.
> 
> I have the feeling that it is cifs that will not grant or perhaps not 
> recognize write permissions on the NAS files although the error 
> message ""Unexpected error: Invalid argument" seems to indicate something 
> else.
> 
> Has this been reported to this mailing list and can anyone please refer me to 
> a possible solution to the problem?

I think I know what this is. It's a bug that's been fixed in
later versions of Samba, and hopefully D-Link will pick up
the fix soon.

Add the option "nounix" to your mount.cifs options list
in fstab and remount the drive.

Jeremy.