nfs4: Let ReplyInterpreter provide original NFS4 error codes

src/add-ons/kernel/file_systems/nfs4/ReplyInterpreter.cpp

@@ -46,6 +46,7 @@ DirEntry::~DirEntry()
 
 ReplyInterpreter::ReplyInterpreter(RPC::Reply* reply)
 	:
+	fNFS4Error(NFS4_OK),
 	fReply(reply)
 {
 	if (reply != NULL)
@@ -62,7 +63,7 @@ ReplyInterpreter::~ReplyInterpreter()
 void
 ReplyInterpreter::_ParseHeader()
 {
-	fReply->Stream().GetUInt();
+	fNFS4Error = fReply->Stream().GetUInt();
 	fReply->Stream().GetOpaque(NULL);
 	fReply->Stream().GetUInt();
 }

src/add-ons/kernel/file_systems/nfs4/ReplyInterpreter.h

@@ -45,6 +45,8 @@ public:
 	inline	status_t	SetTo(RPC::Reply* reply);
 	inline	void		Reset();
 
+	inline	uint32		NFS4Error();
+
 			status_t	Access(uint32* supported, uint32* allowed);
 			status_t	Close();
 			status_t	GetAttr(AttrValue** attrs, uint32* count);
@@ -72,6 +74,7 @@ private:
 
 	static	status_t	_NFS4ErrorToHaiku(uint32 x);
 
+			uint32		fNFS4Error;
 			RPC::Reply*	fReply;
 };
 
@@ -99,6 +102,13 @@ ReplyInterpreter::Reset()
 }
 
 
+inline uint32
+ReplyInterpreter::NFS4Error()
+{
+	return fNFS4Error;
+}
+
+
 inline status_t
 ReplyInterpreter::LookUp()
 {