nfs: modify pg_test interface to return size_t
This is a step toward allowing pg_test to inform the the coalescing code to reduce the size of requests so they may fit in whatever scheme the pg_test callback wants to define. For now, just return the size of the request if there is space, or 0 if there is not. This shouldn't change any behavior as it acts the same as when the pg_test functions returned bool. Signed-off-by: NWeston Andros Adamson <dros@primarydata.com> Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
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