[PATCH v1 13/61] NFSD: Replace READ* macros in nfsd4_decode_lock()

[Chuck Lever <chuck.lever@oracle.com>]

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4xdr.c         |  121 +++++++++++++++++++++++++++++++++------------
 include/uapi/linux/nfs4.h |    1 
 2 files changed, 91 insertions(+), 31 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index c621a38e7874..35329e3d1339 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -484,6 +484,32 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 	DECODE_TAIL;
 }
 
+static __be32 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp,
+				     clientid_t *clientid)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(argp->xdr, NFS4_CLIENTID_SIZE);
+	if (!p)
+		goto xdr_error;
+	memcpy(clientid, p, sizeof(*clientid));
+	return nfs_ok;
+xdr_error:
+	return nfserr_bad_xdr;
+}
+
+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)
 {
@@ -706,44 +732,77 @@ nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 	return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
 }
 
+static __be32
+nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
+				 struct nfsd4_lock *lock)
+{
+	__be32 status;
+
+	lock->lk_is_new = 1;
+
+	if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
+		goto xdr_error;
+	status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
+	if (status)
+		goto out;
+	if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
+		goto xdr_error;
+	status = nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
+					   &lock->lk_new_owner);
+
+out:
+	return status;
+xdr_error:
+	return nfserr_bad_xdr;
+}
+
+static __be32
+nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
+			       struct nfsd4_lock *lock)
+{
+	__be32 status;
+
+	lock->lk_is_new = 0;
+
+	status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
+	if (status)
+		goto out;
+	if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
+		goto xdr_error;
+
+	status = nfs_ok;
+out:
+	return status;
+xdr_error:
+	return nfserr_bad_xdr;
+}
+
 static __be32
 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 {
-	DECODE_HEAD;
+	__be32 *p;
 
-	/*
-	* type, reclaim(boolean), offset, length, new_lock_owner(boolean)
-	*/
-	READ_BUF(28);
-	lock->lk_type = be32_to_cpup(p++);
+	if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
+		goto xdr_error;
 	if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 		goto xdr_error;
-	lock->lk_reclaim = be32_to_cpup(p++);
-	p = xdr_decode_hyper(p, &lock->lk_offset);
-	p = xdr_decode_hyper(p, &lock->lk_length);
-	lock->lk_is_new = be32_to_cpup(p++);
-
-	if (lock->lk_is_new) {
-		READ_BUF(4);
-		lock->lk_new_open_seqid = be32_to_cpup(p++);
-		status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
-		if (status)
-			return status;
-		READ_BUF(8 + sizeof(clientid_t));
-		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);
-	} else {
-		status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
-		if (status)
-			return status;
-		READ_BUF(4);
-		lock->lk_old_lock_seqid = be32_to_cpup(p++);
-	}
+	p = xdr_inline_decode(argp->xdr, sizeof(__be32));
+	if (!p)
+		goto xdr_error;
+	lock->lk_reclaim = (*p == xdr_zero) ? 0 : 1;
+	if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
+		goto xdr_error;
+	if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
+		goto xdr_error;
+	p = xdr_inline_decode(argp->xdr, sizeof(__be32));
+	if (!p)
+		goto xdr_error;
+	if (*p != xdr_zero)
+		return nfsd4_decode_open_to_lock_owner4(argp, lock);
+	return nfsd4_decode_exist_lock_owner4(argp, lock);
 
-	DECODE_TAIL;
+xdr_error:
+	return nfserr_bad_xdr;
 }
 
 static __be32
diff --git a/include/uapi/linux/nfs4.h b/include/uapi/linux/nfs4.h
index ed5415e0f1c1..31072a653436 100644
--- a/include/uapi/linux/nfs4.h
+++ b/include/uapi/linux/nfs4.h
@@ -21,6 +21,7 @@
 #define NFS4_STATEID_SEQID_SIZE 4
 #define NFS4_STATEID_OTHER_SIZE 12
 #define NFS4_STATEID_SIZE	(NFS4_STATEID_SEQID_SIZE + NFS4_STATEID_OTHER_SIZE)
+#define NFS4_CLIENTID_SIZE	8
 #define NFS4_FHSIZE		128
 #define NFS4_MAXPATHLEN		PATH_MAX
 #define NFS4_MAXNAMLEN		NAME_MAX