Small performance optimizations.

fuse/fsconnector.go

@@ -94,12 +94,12 @@ func (c *FileSystemConnector) childLookup(out *raw.EntryOut, fsi FsNode)  {
 
 func (c *FileSystemConnector) findMount(parent *Inode, name string) (mount *fileSystemMount) {
 	parent.treeLock.RLock()
-	defer parent.treeLock.RUnlock()
-	if parent.mounts == nil {
-		return nil
+	if parent.mounts != nil {
+		mount = parent.mounts[name]
 	}
+	parent.treeLock.RUnlock()
 
-	return parent.mounts[name]
+	return 
 }
 
 func (c *FileSystemConnector) toInode(nodeid uint64) *Inode {

fuse/misc.go

@@ -75,9 +75,9 @@ func CheckSuccess(e error) {
 }
 
 // Thanks to Andrew Gerrand for this hack.
-func asSlice(ptr unsafe.Pointer, byteCount uintptr) []byte {
-	h := &reflect.SliceHeader{uintptr(ptr), int(byteCount), int(byteCount)}
-	return *(*[]byte)(unsafe.Pointer(h))
+func toSlice(dest *[]byte, ptr unsafe.Pointer, byteCount uintptr) {
+	h := (*reflect.SliceHeader)(unsafe.Pointer(dest))
+	*h = reflect.SliceHeader{uintptr(ptr), int(byteCount), int(byteCount)}
 }
 
 func Version() string {

fuse/mountstate.go

@@ -295,8 +295,6 @@ func (ms *MountState) loop(exitIdle bool) {
 }
 
 func (ms *MountState) handleRequest(req *request) {
-	defer ms.returnRequest(req)
-
 	req.parse()
 	if req.handler == nil {
 		req.status = ENOSYS
@@ -320,6 +318,7 @@ func (ms *MountState) handleRequest(req *request) {
 		log.Printf("writer: Write/Writev failed, err: %v. opcode: %v",
 			errNo, operationName(req.inHeader.Opcode))
 	}
+	ms.returnRequest(req)
 }
 
 func (ms *MountState) AllocOut(req *request, size uint32) []byte {

fuse/request.go

@@ -171,7 +171,7 @@ func (r *request) parse() {
 		}
 	}
 
-	r.outBuf = zeroOutBuf
+	copy(r.outBuf[:r.handler.OutputSize], zeroOutBuf[:r.handler.OutputSize])
 	r.outData = unsafe.Pointer(&r.outBuf[sizeOfOutHeader])
 }
 
@@ -189,7 +189,9 @@ func (r *request) serialize() (header []byte, data []byte) {
 	o.Length = uint32(
 		int(sizeOfOutHeader) + int(dataLength) + int(len(r.flatData)))
 
-	copy(header[sizeOfOutHeader:], asSlice(r.outData, dataLength))
+	var asSlice []byte
+	toSlice(&asSlice, r.outData, dataLength)
+	copy(header[sizeOfOutHeader:], asSlice)
 	return header, r.flatData
 }