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lockd: Use xdrgen XDR functions for the NLMv3 UNLOCK_MSG procedure

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Continue the xdrgen migration by converting NLMv3 UNLOCK_MSG, the
async counterpart to UNLOCK that clients use to release locks
without waiting for a reply. The procedure now uses
nlm_svc_decode_nlm_unlockargs and nlm_svc_encode_void, generated
from the NLM version 3 protocol specification. The procedure
handler reaches the xdrgen types through the
nlm_unlockargs_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
nlm3svc_lookup_file() 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
UNLOCK and UNLOCK_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 14:13:58 -04:00 committed by Chuck Lever
parent 02a47b6c5c
commit 6a2f89e49b
1 changed files with 66 additions and 50 deletions
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116
fs/lockd/svcproc.c
View File

@ -537,42 +537,6 @@ nlmsvc_proc_cancel(struct svc_rqst *rqstp)
rpc_drop_reply : rpc_success;
}
/*
* UNLOCK: release a lock
*/
static __be32
__nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct lockd_res *resp)
{
struct lockd_args *argp = rqstp->rq_argp;
struct nlm_host *host;
struct nlm_file *file;
struct net *net = SVC_NET(rqstp);
dprintk("lockd: UNLOCK called\n");
resp->cookie = argp->cookie;
/* Don't accept new lock requests during grace period */
if (locks_in_grace(net)) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
/* Obtain client and file */
if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
return resp->status == nlm__int__drop_reply ?
rpc_drop_reply : rpc_success;
/* Now try to remove the lock */
resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
nlmsvc_release_lockowner(&argp->lock);
nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
/**
* nlmsvc_proc_unlock - UNLOCK: Remove a lock
* @rqstp: RPC transaction context
@ -935,19 +899,71 @@ static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
__nlmsvc_proc_cancel_msg);
}
static __be32
__nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct lockd_res *resp)
{
struct nlm_unlockargs_wrapper *argp = rqstp->rq_argp;
struct net *net = SVC_NET(rqstp);
struct nlm_file *file = NULL;
struct nlm_host *host = NULL;
resp->status = nlm_lck_denied_nolocks;
if (nlm_netobj_to_cookie(&resp->cookie, &argp->xdrgen.cookie))
goto out;
resp->status = nlm_lck_denied_grace_period;
if (locks_in_grace(net))
goto out;
resp->status = nlm_lck_denied_nolocks;
host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
if (!host)
goto out;
resp->status = nlm3svc_lookup_file(rqstp, host, &argp->lock,
&file, &argp->xdrgen.alock, F_UNLCK);
if (resp->status)
goto out;
resp->status = nlmsvc_unlock(net, file, &argp->lock);
nlmsvc_release_lockowner(&argp->lock);
out:
if (file)
nlm_release_file(file);
nlmsvc_release_host(host);
return resp->status == nlm__int__drop_reply ? rpc_drop_reply : rpc_success;
}
/**
* nlmsvc_proc_unlock_msg - UNLOCK_MSG: Remove an existing lock
* @rqstp: RPC transaction context
*
* Returns:
* %rpc_success: RPC executed successfully.
* %rpc_drop_reply: Do not send an RPC reply.
* %rpc_garbage_args: The request arguments are malformed.
* %rpc_system_err: RPC execution failed.
*
* RPC synopsis:
* void NLMPROC_UNLOCK_MSG(nlm_unlockargs) = 9;
*
* The response to this request is delivered via the UNLOCK_RES procedure.
*/
static __be32 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
{
struct lockd_args *argp = rqstp->rq_argp;
struct nlm_host *host;
struct nlm_unlockargs_wrapper *argp = rqstp->rq_argp;
struct nlm_host *host;
dprintk("lockd: UNLOCK_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_UNLOCK_RES,
__nlmsvc_proc_unlock);
__nlmsvc_proc_unlock_msg);
}
static __be32 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
@ -1218,15 +1234,15 @@ static const struct svc_procedure nlmsvc_procedures[24] = {
.pc_xdrressize = XDR_void,
.pc_name = "CANCEL_MSG",
},
[NLMPROC_UNLOCK_MSG] = {
.pc_func = nlmsvc_proc_unlock_msg,
.pc_decode = nlmsvc_decode_unlockargs,
.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 = "UNLOCK_MSG",
[NLM_UNLOCK_MSG] = {
.pc_func = nlmsvc_proc_unlock_msg,
.pc_decode = nlm_svc_decode_nlm_unlockargs,
.pc_encode = nlm_svc_encode_void,
.pc_argsize = sizeof(struct nlm_unlockargs_wrapper),
.pc_argzero = 0,
.pc_ressize = 0,
.pc_xdrressize = XDR_void,
.pc_name = "UNLOCK_MSG",
},
[NLMPROC_GRANTED_MSG] = {
.pc_func = nlmsvc_proc_granted_msg,