lockd: Use xdrgen XDR functions for the NLMv4 LOCK_MSG procedure

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The LOCK_MSG procedure is part of NLM's asynchronous lock
request flow, where clients send LOCK_MSG to request locks
that may block. This patch continues the xdrgen migration by
converting LOCK_MSG to use generated XDR functions.

This patch converts the LOCK_MSG procedure to use xdrgen
functions nlm4_svc_decode_nlm4_lockargs and
nlm4_svc_encode_void generated from the NLM version 4
protocol specification. The procedure handler uses xdrgen
types through the nlm4_lockargs_wrapper structure that
bridges between generated code and the legacy nlm_lock
representation.

The pc_argzero field is set to zero because xdrgen decoders
reliably initialize all arguments in the argp->xdrgen field,
making the early defensive memset unnecessary. Remaining
argp fields are cleared as needed.

The NLM async callback mechanism uses client-side functions
which continue to take legacy results like struct nlm_res,
preventing LOCK and LOCK_MSG from sharing code for now.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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This commit is contained in:

Chuck Lever 2026-02-17 17:07:02 -05:00

parent 331f2b6acb

commit b2be4e28c2

1 changed files with 61 additions and 16 deletions

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fs/lockd/svc4proc.c

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