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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>
This commit is contained in:
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
fs/lockd/svcproc.c
View File

@ -594,23 +594,6 @@ nlmsvc_proc_unlock(struct svc_rqst *rqstp)
rpc_drop_reply : rpc_success;
}
/*
* GRANTED: A server calls us to tell that a process' lock request
* was granted
*/
static __be32
__nlmsvc_proc_granted(struct svc_rqst *rqstp, struct lockd_res *resp)
{
struct lockd_args *argp = rqstp->rq_argp;
resp->cookie = argp->cookie;
dprintk("lockd: GRANTED called\n");
resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
return rpc_success;
}
/**
* nlmsvc_proc_granted - GRANTED: Blocked lock has been granted
* @rqstp: RPC transaction context
@ -966,19 +949,52 @@ static __be32 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
__nlmsvc_proc_unlock_msg);
}
static __be32
__nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct lockd_res *resp)
{
struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
resp->status = nlm_lck_denied;
if (nlm_netobj_to_cookie(&resp->cookie, &argp->xdrgen.cookie))
goto out;
if (nlm_lock_to_lockd_lock(&argp->lock, &argp->xdrgen.alock))
goto out;
resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
out:
return rpc_success;
}
/**
* nlmsvc_proc_granted_msg - GRANTED_MSG: Blocked lock has been granted
* @rqstp: RPC transaction context
*
* Returns:
* %rpc_success: RPC executed successfully.
* %rpc_garbage_args: The request arguments are malformed.
* %rpc_system_err: RPC execution failed.
*
* RPC synopsis:
* void NLMPROC_GRANTED_MSG(nlm_testargs) = 10;
*
* The response to this request is delivered via the GRANTED_RES procedure.
*/
static __be32 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
{
struct lockd_args *argp = rqstp->rq_argp;
struct nlm_host *host;
struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
struct nlm_host *host;
dprintk("lockd: GRANTED_MSG called\n");
if (argp->xdrgen.cookie.len > NLM_MAXCOOKIELEN)
return rpc_garbage_args;
host = nlmsvc_lookup_host(rqstp, argp->lock.caller, argp->lock.len);
host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
if (!host)
return rpc_system_err;
return nlmsvc_callback(rqstp, host, NLMPROC_GRANTED_RES,
__nlmsvc_proc_granted);
__nlmsvc_proc_granted_msg);
}
/*
@ -1244,15 +1260,15 @@ static const struct svc_procedure nlmsvc_procedures[24] = {
.pc_xdrressize = XDR_void,
.pc_name = "UNLOCK_MSG",
},
[NLMPROC_GRANTED_MSG] = {
.pc_func = nlmsvc_proc_granted_msg,
.pc_decode = nlmsvc_decode_testargs,
.pc_encode = nlmsvc_encode_void,
.pc_argsize = sizeof(struct lockd_args),
.pc_argzero = sizeof(struct lockd_args),
.pc_ressize = sizeof(struct nlm_void),
.pc_xdrressize = St,
.pc_name = "GRANTED_MSG",
[NLM_GRANTED_MSG] = {
.pc_func = nlmsvc_proc_granted_msg,
.pc_decode = nlm_svc_decode_nlm_testargs,
.pc_encode = nlm_svc_encode_void,
.pc_argsize = sizeof(struct nlm_testargs_wrapper),
.pc_argzero = 0,
.pc_ressize = 0,
.pc_xdrressize = XDR_void,
.pc_name = "GRANTED_MSG",
},
[NLMPROC_TEST_RES] = {
.pc_func = nlmsvc_proc_null,