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NFSD: Hoist status code encoding into XDR encoder functions
The original intent was presumably to reduce code duplication. The trade-off was: - No support for an NFSD proc function returning a non-success RPC accept_stat value. - No support for void NFS replies to non-NULL procedures. - Everyone pays for the deduplication with a few extra conditional branches in a hot path. In addition, nfsd_dispatch() leaves *statp uninitialized in the success path, unlike svc_generic_dispatch(). Address all of these problems by moving the logic for encoding the NFS status code into the NFS XDR encoders themselves. Then update the NFS .pc_func methods to return an RPC accept_stat value. Signed-off-by: Chuck Lever <[email protected]> Signed-off-by: J. Bruce Fields <[email protected]>
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