NFSD: Add helpers to decode a clientid4 and an NFSv4 state owner

These helpers will also be used to simplify decoders in subsequent
patches.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 29 insertions, 5 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 3c67634963d0..1b214b475d68 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -609,6 +609,30 @@ nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
 	return nfs_ok;
 }
 
+static __be32
+nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(argp->xdr, sizeof(__be64));
+	if (!p)
+		return nfserr_bad_xdr;
+	memcpy(clientid, p, sizeof(*clientid));
+	return nfs_ok;
+}
+
+static __be32
+nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
+			  clientid_t *clientid, struct xdr_netobj *owner)
+{
+	__be32 status;
+
+	status = nfsd4_decode_clientid4(argp, clientid);
+	if (status)
+		return status;
+	return nfsd4_decode_opaque(argp, owner);
+}
+
 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 {
 	DECODE_HEAD;
@@ -832,12 +856,12 @@ nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 		status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 		if (status)
 			return status;
-		READ_BUF(8 + sizeof(clientid_t));
+		READ_BUF(4);
 		lock->lk_new_lock_seqid = be32_to_cpup(p++);
-		COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
-		lock->lk_new_owner.len = be32_to_cpup(p++);
-		READ_BUF(lock->lk_new_owner.len);
-		READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
+		status = nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
+						   &lock->lk_new_owner);
+		if (status)
+			return status;
 	} else {
 		status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 		if (status)