fuse/nodefs: Set all fields in memNode before making it available.

This fixes the data race in TestDeleteNotify.

fuse/nodefs/memnode.go

@@ -75,12 +75,6 @@ type memNode struct {
 	info fuse.Attr
 }
 
-func (n *memNode) newNode(name string, isDir bool) *memNode {
-	newNode := n.fs.newNode()
-	n.Inode().NewChild(name, isDir, newNode)
-	return newNode
-}
-
 func (n *memNode) filename() string {
 	return fmt.Sprintf("%s%d", n.fs.backingStorePrefix, n.id)
 }
@@ -98,8 +92,9 @@ func (n *memNode) StatFs() *fuse.StatfsOut {
 }
 
 func (n *memNode) Mkdir(name string, mode uint32, context *fuse.Context) (newNode *Inode, code fuse.Status) {
-	ch := n.newNode(name, true)
+	ch := n.fs.newNode()
 	ch.info.Mode = mode | fuse.S_IFDIR
+	n.Inode().NewChild(name, true, ch)
 	return ch.Inode(), fuse.OK
 }
 
@@ -116,10 +111,10 @@ func (n *memNode) Rmdir(name string, context *fuse.Context) (code fuse.Status) {
 }
 
 func (n *memNode) Symlink(name string, content string, context *fuse.Context) (newNode *Inode, code fuse.Status) {
-	ch := n.newNode(name, false)
+	ch := n.fs.newNode()
 	ch.info.Mode = fuse.S_IFLNK | 0777
 	ch.link = content
-
+	n.Inode().NewChild(name, false, ch)
 	return ch.Inode(), fuse.OK
 }
 
@@ -136,13 +131,14 @@ func (n *memNode) Link(name string, existing Node, context *fuse.Context) (*Inod
 }
 
 func (n *memNode) Create(name string, flags uint32, mode uint32, context *fuse.Context) (file File, node *Inode, code fuse.Status) {
-	ch := n.newNode(name, false)
+	ch := n.fs.newNode()
 	ch.info.Mode = mode | fuse.S_IFREG
 
 	f, err := os.Create(ch.filename())
 	if err != nil {
 		return nil, nil, fuse.ToStatus(err)
 	}
+	n.Inode().NewChild(name, false, ch)
 	return ch.newFile(f), ch.Inode(), fuse.OK
 }