NFS: Allow nfs_updatepage to extend a write under additional circumstances
Currently nfs_updatepage allows a write to be extended to cover a full page only if we don't have a byte range lock lock on the file... but if we have a write delegation on the file or if we have the whole file locked for writing then we should be allowed to extend the write as well. Signed-off-by: NScott Mayhew <smayhew@redhat.com> [Trond: fix up call to nfs_have_delegation()] Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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