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Sender: Chuck Lever <chucklever@gmail.com>
Subject: [PATCH v2 024/118] NFSD: Add helpers to decode a clientid4 and an
 NFSv4 state owner
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-nfs@vger.kernel.org
Date:   Fri, 20 Nov 2020 15:35:54 -0500
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These helpers will also be used to simplify decoders in subsequent
patches.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4xdr.c |   34 +++++++++++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 5 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index ec2cad8477e0..a7c9a0368951 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -541,6 +541,30 @@ nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
 	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_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
 {
@@ -779,12 +803,12 @@ nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 		status = nfsd4_decode_stateid4(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_stateid4(argp, &lock->lk_old_lock_stateid);
 		if (status)