[Federated-fs] fs_root in federated namespace

[Raj, Theresa]

Thanks Dan, Manoj, for clarifying this. This makes sense. All that root
namespace discussion got me confused about fs_root.

Theresa

>  -----Original Message-----
>  From: Ellard, Daniel 
>  Sent: Monday, June 16, 2008 10:58 AM
>  To: Raj, Theresa; federated-fs at sdsc.edu
>  Subject: RE: [Federated-fs] fs_root in federated namespace
>  
>  
>  Theresa --
>  
>  	I think that the fs_root has a different meaning than 
>  how you're interpreting it, and the good news is that I 
>  think this makes the problem much simpler.
>  
>  The fs_root isn't the location of the root of the fileset in 
>  the global namespace -- it's the name relative to the root 
>  of that specific server, not the position of the fileset in 
>  the global (client-visible) namespace.  (at least, that's 
>  how I read section 6.3 of the nfsv4 spec/11.9 of the 4.11 
>  spec; someone PLEASE tell me if I'm wrong!)
>  
>  No NSDB operations should be required to find the fs_root. 
>  (and currently, there aren't any NSDB operations that would 
>  be particularly useful in finding the fs_root)
>  
>  -Dan
>  
>  -----Original Message-----
>  From: Raj, Theresa
>  Sent: Monday, June 16, 2008 1:00 PM
>  To: federated-fs at sdsc.edu
>  Subject: [Federated-fs] fs_root in federated namespace
>  
>  I have a question about the fs_root value provided by 
>  fileservers as part of the FS_LOCATIONS attribute. This also 
>  kind of ties into the root namespace discussion that's 
>  recently come up on the list.
>   
>  In the federated namespace, a fileserver's fileset is 
>  hanging off someplace within the namespace. And it is not 
>  incumbent upon the fileserver to know about where this 
>  fileset is hanging in the namespace, i.e., the fileserver 
>  need not know the pathname from the root of the namespace 
>  that leads to the junction that has the FSL pointing to this 
>  fileserver and this fileset. 
>   
>  So now if there is a junction embedded in its fileset, the 
>  fileserver is required to provide the FS_LOCATIONS attribute 
>  for that junction. For the server, rootpath details of that 
>  junction the NSDB has that information and the fileserver 
>  will obtain those from the NSDB. But for the fs_root part of 
>  this attribute, how can the fileserver construct the full 
>  pathname to that junction. The fileserver can figure out the 
>  portion of the pathname that is within its fileset but not 
>  the antecedent portion of the pathname.
>   
>  I think that the fileserver needs some help to figure the 
>  fs_root value.
>  How that can be achieved in another discussion.
>   
>  Thanks,
>  Theresa
>   
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