Add DevNull file.

fuse/Makefile

@@ -18,7 +18,8 @@ GOFILES=misc.go\
 	wrappedfs.go \
 	timingfs.go \
 	timingrawfs.go \
-	xattr.go
+	xattr.go \
+	devnull.go \
 
 include $(GOROOT)/src/Make.pkg
 

fuse/default_test.go

@@ -35,3 +35,4 @@ func TestDummyFile(t *testing.T) {
 	_ = fileDir
 	_ = filePtr
 }
+

fuse/devnull.go

+package fuse
+
+// A FUSE file that accepts any write, and always returns EOF.
+type DevNullFile struct {
+	DefaultRawFuseFile
+}
+
+func NewDevNullFile() *DevNullFile {
+	return new(DevNullFile)
+}
+
+func (me *DevNullFile) Read(input *ReadIn, bp *BufferPool) ([]byte, Status) {
+	return []byte{}, OK
+}
+
+func (me *DevNullFile) Write(input *WriteIn, content []byte) (uint32, Status) {
+	return uint32(len(content)), OK
+}
+
+func (me *DevNullFile) Flush() Status {
+	return OK
+}
+
+func (me *DevNullFile) Fsync(*FsyncIn) (code Status) {
+	return OK
+}