nfs4: Use existing write cookie, do not send COMMIT if not necessary

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

@@ -24,7 +24,9 @@ Inode::Inode()
 	:
 	fAttrCacheExpire(0),
 	fCache(NULL),
-	fFileCache(NULL)
+	fFileCache(NULL),
+	fWriteCookie(NULL),
+	fWriteDirty(false)
 {
 	mutex_init(&fAttrCacheLock, NULL);
 }

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

@@ -31,6 +31,8 @@ public:
 	inline			FileSystem*	GetFileSystem() const;
 
 	inline			void*		FileCache();
+	inline			OpenFileCookie*	WriteCookie();
+	inline			void		SetWriteCookie(OpenFileCookie* cookie);
 
 					status_t	GetChangeInfo(uint64* change);
 
@@ -116,6 +118,9 @@ protected:
 
 					DirectoryCache*	fCache;
 					void*		fFileCache;
+					OpenFileCookie*	fWriteCookie;
+
+					bool		fWriteDirty;
 };
 
 
@@ -165,5 +170,19 @@ Inode::FileCache()
 }
 
 
+inline OpenFileCookie*
+Inode::WriteCookie()
+{
+	return fWriteCookie;
+}
+
+
+inline void
+Inode::SetWriteCookie(OpenFileCookie* cookie)
+{
+	fWriteCookie = cookie;
+}
+
+
 #endif	// INODE_H
 

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

@@ -384,6 +384,8 @@ Inode::Write(OpenFileCookie* cookie, off_t pos, const void* _buffer,
 	uint64 fileSize;
 	const char* buffer = reinterpret_cast<const char*>(_buffer);
 
+	fWriteDirty = true;
+
 	while (size < *_length) {
 		do {
 			RPC::Server* serv = fFileSystem->Server();
@@ -460,6 +462,9 @@ Inode::Write(OpenFileCookie* cookie, off_t pos, const void* _buffer,
 status_t
 Inode::Commit()
 {
+	if (!fWriteDirty)
+		return B_OK;
+
 	do {
 		RPC::Server* serv = fFileSystem->Server();
 		Request request(serv);

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

@@ -221,6 +221,7 @@ nfs4_read_pages(fs_volume* _volume, fs_vnode* vnode, void* _cookie, off_t pos,
 	OpenFileCookie* cookie = reinterpret_cast<OpenFileCookie*>(_cookie);
 
 	status_t result;
+	size_t totalRead = 0;
 	bool eof = false;
 	for (size_t i = 0; i < count && !eof; i++) {
 		size_t bytesLeft = vecs[i].iov_len;
@@ -232,12 +233,15 @@ nfs4_read_pages(fs_volume* _volume, fs_vnode* vnode, void* _cookie, off_t pos,
 			if (result != B_OK)
 				return result;
 
+			totalRead += bytesRead;
 			pos += bytesRead;
 			buffer += bytesRead;
 			bytesLeft -= bytesRead;
 		} while (bytesLeft > 0 && !eof);
 	}
 
+	*_numBytes = totalRead;
+
 	return B_OK;
 }
 
@@ -247,21 +251,12 @@ nfs4_write_pages(fs_volume* _volume, fs_vnode* vnode, void* _cookie, off_t pos,
 	const iovec* vecs, size_t count, size_t* _numBytes)
 {
 	Inode* inode = reinterpret_cast<Inode*>(vnode->private_node);
-	bool freeCookie = false;
 	OpenFileCookie* cookie = reinterpret_cast<OpenFileCookie*>(_cookie);
 
 	if (cookie == NULL) {
-		cookie = new OpenFileCookie;
+		cookie = inode->WriteCookie();
 		if (cookie == NULL)
-			return B_NO_MEMORY;
+			return B_BAD_VALUE;
-
-		status_t result = inode->Open(O_WRONLY, cookie);
-		if (result != B_OK) {
-			delete cookie;
-			return result;
-		}
-
-		freeCookie = true;
 	}
 
 	status_t result;
@@ -274,13 +269,8 @@ nfs4_write_pages(fs_volume* _volume, fs_vnode* vnode, void* _cookie, off_t pos,
 			size_t bytesWritten = min_c(ioSize, bytesLeft);
 
 			result = inode->Write(cookie, pos, buffer, &bytesWritten);
-			if (result != B_OK) {
+			if (result != B_OK)
-				if (freeCookie) {
-					inode->Close(cookie);
-					delete cookie;
-				}
 				return result;
-			}
 
 			bytesLeft -= bytesWritten;
 			pos += bytesWritten;
@@ -288,11 +278,6 @@ nfs4_write_pages(fs_volume* _volume, fs_vnode* vnode, void* _cookie, off_t pos,
 		} while (bytesLeft > 0);
 	}
 
-	if (freeCookie) {
-		inode->Close(cookie);
-		delete cookie;
-	}
-
 	return B_OK;
 }
 
@@ -326,7 +311,11 @@ static status_t
 nfs4_fsync(fs_volume* volume, fs_vnode* vnode)
 {
 	Inode* inode = reinterpret_cast<Inode*>(vnode->private_node);
-	return file_cache_sync(inode->FileCache());
+	status_t result = file_cache_sync(inode->FileCache());
+	if (result != B_OK)
+		return result;
+
+	return inode->Commit();
 }
 
 
@@ -473,6 +462,10 @@ nfs4_free_cookie(fs_volume* volume, fs_vnode* vnode, void* _cookie)
 	OpenFileCookie* cookie = reinterpret_cast<OpenFileCookie*>(_cookie);
 	file_cache_sync(inode->FileCache());
 	inode->Commit();
+
+	if (inode->WriteCookie() == cookie)
+		inode->SetWriteCookie(NULL);
+
 	inode->Close(cookie);
 	delete cookie;
 
@@ -520,6 +513,7 @@ nfs4_write(fs_volume* volume, fs_vnode* vnode, void* _cookie, off_t pos,
 	if (result != B_OK)
 		return result;
 
+	inode->SetWriteCookie(cookie);
 	return file_cache_write(inode->FileCache(), cookie, pos, _buffer, length);
 }