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committer Trond Myklebust <Trond.Myklebust@netapp.com> 1340918444 -0400

NFSv4: Simplify the GETATTR attribute length calculation

Use the xdr_stream position counter as the basis for the calculation
instead of assuming that we can calculate an offset to the start
of the iovec.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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