nfsd: Add a tracepoint for errors in nfsd4_clone_file_range()
Since a clone error commit can cause the boot verifier to change, we should trace those errors. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> [ cel: Addressed a checkpatch.pl splat in fs/nfsd/vfs.h ]
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