lockd: Use xdrgen XDR functions for the NLMv3 GRANTED_MSG procedure

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Continue the xdrgen migration by converting NLMv3 GRANTED_MSG,
the async counterpart to GRANTED that a remote NLM uses to tell
this lockd that a previously blocked client lock request has
become available. The procedure now uses
nlm_svc_decode_nlm_testargs and nlm_svc_encode_void, generated
from the NLM version 3 protocol specification. The procedure
handler reaches the xdrgen types through the
nlm_testargs_wrapper structure, which bridges between generated
code and the legacy lockd_lock representation.

Setting pc_argzero to zero is safe because the generated decoder
fills the argp->xdrgen subfields before the procedure runs, so
the zeroing memset performed by the dispatch layer is not
needed. The lock member of the wrapper is populated explicitly
in __nlmsvc_proc_granted_msg() by nlm_lock_to_lockd_lock()
rather than relying on zero-initialization.

The NLM async callback mechanism uses client-side functions
which continue to take legacy results like struct lockd_res,
preventing GRANTED and GRANTED_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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Chuck Lever 2026-05-12 14:13:59 -04:00 • committed by Chuck Lever

parent 6a2f89e49b

commit 6c534ad999

1 changed files with 47 additions and 31 deletions

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fs/lockd/svcproc.c

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