nfs-for-4.8-1

NFS client updates for Linux 4.8

Highlights include:

Stable bugfixes:
 - nfs: don't create zero-length requests
 - Several LAYOUTGET bugfixes

Features:
 - Several performance related features
   - More aggressive caching when we can rely on close-to-open cache
     consistency
   - Remove serialisation of O_DIRECT reads and writes
   - Optimise several code paths to not flush to disk unnecessarily. However
     allow for the idiosyncracies of pNFS for those layout types that need
     to issue a LAYOUTCOMMIT before the metadata can be updated on the server.
   - SUNRPC updates to the client data receive path
 - pNFS/SCSI support RH/Fedora dm-mpath device nodes
 - pNFS files/flexfiles can now use unprivileged ports when the generic NFS
   mount options allow it.

Bugfixes:
 - Don't use RDMA direct data placement together with data integrity or
   privacy security flavours
 - Remove the RDMA ALLPHYSICAL memory registration mode as it has potential
   security holes.
 - Several layout recall fixes to improve NFSv4.1 protocol compliance.
 - Fix an Oops in the pNFS files and flexfiles connection setup to the DS
 - Allow retry of operations that used a returned delegation stateid
 - Don't mark the inode as revalidated if a LAYOUTCOMMIT is outstanding
 - Fix writeback races in nfs4_copy_range() and nfs42_proc_deallocate()
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