Implement GetXAttr in GoUnionFs.

unionfs/autounion.go

@@ -118,6 +118,11 @@ func (me *AutoUnionFs) Readlink(path string) (out string, code fuse.Status) {
 	return fs.Roots()[0], fuse.OK
 }
 
+// Must define this, because ENOSYS will suspend all GetXAttr calls.
+func (me *AutoUnionFs) GetXAttr(name string, attr string) ([]byte, fuse.Status) {
+	return nil, syscall.ENODATA
+}
+
 func (me *AutoUnionFs) GetAttr(path string) (*fuse.Attr, fuse.Status) {
 	if path == "" || path == _CONFIG || path == _STATUS {
 		a := &fuse.Attr{

unionfs/unionfs.go

@@ -356,6 +356,14 @@ func (me *UnionFs) GetAttr(name string) (a *fuse.Attr, s fuse.Status) {
 	return r.attr, r.code
 }
 
+func (me *UnionFs) GetXAttr(name string, attr string) ([]byte, fuse.Status) {
+	branch := me.getBranch(name)
+	if branch >= 0 {
+		return me.fileSystems[branch].GetXAttr(name, attr)
+	}
+	return nil, fuse.ENOENT
+}
+
 func (me *UnionFs) OpenDir(directory string) (stream chan fuse.DirEntry, status fuse.Status) {
 	dirBranch := me.getBranch(directory)
 	if dirBranch < 0 {