[PATCH v2 34/42] lockd: Hoist file_lock init out of nlm4svc_decode_shareargs()

[Chuck Lever <cel@kernel.org>]

From: Chuck Lever <chuck.lever@oracle.com>

The xdrgen-generated XDR decoders cannot initialize the
file_lock structure because it is an internal kernel type,
not part of the wire protocol. To prepare for converting
SHARE and UNSHARE procedures to use xdrgen, the file_lock
initialization must be moved from nlm4svc_decode_shareargs()
into the procedure handlers themselves.

This change removes one more dependency on the "struct
nlm_lock::fl" field in fs/lockd/xdr4.c, allowing the XDR
decoder to focus solely on unmarshalling wire data.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/lockd/svc4proc.c | 16 ++++++++++++----
 fs/lockd/xdr4.c     |  3 ---
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index d8a5f662ab39..4667e4a1278f 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -1040,6 +1040,7 @@ nlm4svc_proc_share(struct svc_rqst *rqstp)
 {
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_res *resp = rqstp->rq_resp;
+	struct nlm_lock	*lock = &argp->lock;
 	struct nlm_host	*host;
 	struct nlm_file	*file;
 
@@ -1054,14 +1055,17 @@ nlm4svc_proc_share(struct svc_rqst *rqstp)
 	}
 
 	/* Obtain client and file */
-	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+	locks_init_lock(&lock->fl);
+	lock->svid = ~(u32)0;
+	resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file);
+	if (resp->status)
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
 
 	/* Now try to create the share */
 	resp->status = nlmsvc_share_file(host, file, argp);
 
 	dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
-	nlmsvc_release_lockowner(&argp->lock);
+	nlmsvc_release_lockowner(lock);
 	nlmsvc_release_host(host);
 	nlm_release_file(file);
 	return rpc_success;
@@ -1075,6 +1079,7 @@ nlm4svc_proc_unshare(struct svc_rqst *rqstp)
 {
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_res *resp = rqstp->rq_resp;
+	struct nlm_lock	*lock = &argp->lock;
 	struct nlm_host	*host;
 	struct nlm_file	*file;
 
@@ -1089,14 +1094,17 @@ nlm4svc_proc_unshare(struct svc_rqst *rqstp)
 	}
 
 	/* Obtain client and file */
-	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+	locks_init_lock(&lock->fl);
+	lock->svid = ~(u32)0;
+	resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file);
+	if (resp->status)
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
 
 	/* Now try to lock the file */
 	resp->status = nlmsvc_unshare_file(host, file, argp);
 
 	dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
-	nlmsvc_release_lockowner(&argp->lock);
+	nlmsvc_release_lockowner(lock);
 	nlmsvc_release_host(host);
 	nlm_release_file(file);
 	return rpc_success;
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
index dbbb2dfcb81b..308aac92a94e 100644
--- a/fs/lockd/xdr4.c
+++ b/fs/lockd/xdr4.c
@@ -257,9 +257,6 @@ nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_lock	*lock = &argp->lock;
 
-	locks_init_lock(&lock->fl);
-	lock->svid = ~(u32)0;
-
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
 		return false;
 	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
-- 
2.52.0