[Samba] Alternative data stream on volume cannot be created

[Jeremy Allison]

On Thu, Sep 11, 2014 at 05:53:39PM -0400, Tao Sang wrote:
> Hello,
> 
>  
> 
> I met an issue to create ADS on a volume to store meta info.
> 
> A Samba server on Ubuntu is configured as follows to provide a share for
> Windows client.  
> 
>  
> 
> OS: Ubuntu 14.04.1 LTS.
> 
> SAMBA: Version 4.1.6-Ubuntu
> 
> Kernel: 3.13.0-34-generic
> 
>  
> 
> The policy is as follows,
> 
>  
> 
> [Share]
> 
> path = /home/daniel/Public/sharefolder1
> 
> read only = no
> 
> browseable = yes
> 
> guest ok = no
> 
> create mask = 0777
> 
> directory mask = 0777
> 
> vfs objects = streams_xattr
> 
>  
> 
> On Win7 64bit client, I opened a console to test and got  the following
> results:
> 
>  
> 
> 1. File data stream can be created.
> 
>  
> 
> echo "sdfsdfc' > \\Server\Share\file:MetaInfo
> 
>  
> 
> Where Server is the computer name of the Ubuntu  machine; file is an
> existing file name.. 
> 
>  
> 
> The command  succeeds.
> 
>  
> 
>  
> 
> 2. Folder data stream can be created .
> 
>  
> 
> echo "sdfds" > \\Server\Share\fold\:MetaInfo
> 
>  
> 
> Where fold is an existing  directory name.
> 
>  
> 
> It succeeds as well.
> 
>  
> 
>  
> 
> 3. Volume data stream cannot be created.
> 
>  
> 
> echo "dfvddfv" > \\Server\Share\:MetaInfo
> 
>  
> 
> It fails with an error message: The system cannot find the file
> specified.
> 
>  
> 
> I tested on a  network folder shared  by windows machine, the volume
> data stream can be created.

I'm guessing you're creating an ADS on the '.' directory
of the share. Can you post a wireshark trace of this
succeeding Windows -> Windows so we can investigate ?

Thanks,

Jeremy.