[pnfs] 2.6.17 pnfs as client module

[William A.(Andy) Adamson]

eshel at almaden.ibm.com said:
> The reference to inode_lock was added by me with the recall layout patch.
> The reason I did not see the error that Dean got is because I was running  on
> a UP where spin_lock is a no-op. I am not sure if exporting inode_lock  is
> the right thing to do, maybe in the future we will have all the layouts  on
> some other chain (cache) so we will not have to scan the all the  inodes.
> Marc. 

yes, we most certainly do not want hold the inode_lock and scan all the 
inodes. so, this will go away with a layout cache design, but works for now.

-->Andy