[pnfs] Layoutreturn Implementation

[Dean Hildebrand]

I think it has to be sync since we can't remove the inode until it 
completes successfully.
Dean

Iyer, Rahul wrote:
> Hi,
> Currently, free_layout() is being called from only one functioon: 
> nfs4_clear_inode(). nfs4_clear_inode() is the .clear_inode pointer of 
> super_operations. The .clear_inode pointer is called by clear_inode(). 
> This is called mainly to remove the in memory inode reference.
>  
> The function that I spoke about, wwhich makes the LAYOUTRETURN rpc is 
> pnfs_return_layout(). This function is, however called nowhere. All 
> that needs to be done on the client is to call pnfs_return_layout() in 
> nfs4_clear_inode().
> So, I presume it's fairly simple. However, I had a question:
> nfs4_proc_pnfs_layoutreturn() makes a call to rpc_call_sync(). Should 
> LAYOUTRETURN be a synchronous RPC? Is it better asynchronous? Do we care?
>  
> Thanks
> Rahul
>  
>  
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-- 
Dean Hildebrand
Ph.D. Candidate
University of Michigan