nfs4: Get correct change value for attribute directories

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

@@ -179,7 +179,7 @@ status_t
 DirectoryCache::Revalidate()
 {
 	uint64 change;
-	if (fInode->GetChangeInfo(&change) == B_OK && change == fChange) {
+	if (fInode->GetChangeInfo(&change, true) == B_OK && change == fChange) {
 		fExpireTime = system_time() + kExpirationTime;
 		return B_OK;
 	}

src/add-ons/kernel/file_systems/nfs4/NFS4Inode.cpp

@@ -14,14 +14,17 @@
 
 
 status_t
-NFS4Inode::GetChangeInfo(uint64* change)
+NFS4Inode::GetChangeInfo(uint64* change, bool attrDir)
 {
 	do {
 		RPC::Server* serv = fFileSystem->Server();
 		Request request(serv);
 		RequestBuilder& req = request.Builder();
 
-		req.PutFH(fInfo.fHandle);
+		if (attrDir)
+			req.PutFH(fInfo.fAttrDir);
+		else
+			req.PutFH(fInfo.fHandle);
 
 		Attribute attr[] = { FATTR4_CHANGE };
 		req.GetAttr(attr, sizeof(attr) / sizeof(Attribute));

src/add-ons/kernel/file_systems/nfs4/NFS4Inode.h

@@ -22,7 +22,7 @@
 
 class NFS4Inode : protected NFS4Object {
 public:
-			status_t	GetChangeInfo(uint64* change);
+			status_t	GetChangeInfo(uint64* change, bool attrDir = false);
 			status_t	ReadLink(void* buffer, size_t* length);
 
 protected: