fs: add timing info for android extensions.

fs/android.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"log"
 	"syscall"
+	"time"
 
 	"github.com/hanwen/go-fuse/fuse"
 )
@@ -17,14 +18,18 @@ type androidNode struct {
 	mtpNodeImpl
 
 	// If set, the backing file was changed.
-	write bool
+	write     bool
+	start     time.Time
+	byteCount int64
 }
 
 func (n *androidNode) startEdit() bool {
 	if n.write {
 		return true
 	}
 
+	n.start = time.Now()
+	n.byteCount = 0
 	err := n.fs.dev.AndroidBeginEditObject(n.Handle())
 	if err != nil {
 		log.Println("AndroidBeginEditObject failed:", err)
@@ -39,6 +44,10 @@ func (n *androidNode) endEdit() bool {
 		return true
 	}
 
+	dt := time.Now().Sub(n.start)
+	log.Printf("%d bytes in %v: %d mb/s",
+		n.byteCount, dt, (1e3*n.byteCount)/(dt.Nanoseconds()))
+
 	err := n.fs.dev.AndroidEndEditObject(n.Handle())
 	if err != nil {
 		log.Println("AndroidEndEditObject failed:", err)
@@ -106,7 +115,7 @@ func (f *androidFile) Write(dest []byte, off int64) (written uint32, status fuse
 	if !f.node.startEdit() {
 		return 0, fuse.EIO
 	}
-
+	f.node.byteCount += int64(len(dest))
 	b := bytes.NewBuffer(dest)
 	err := f.node.fs.dev.AndroidSendPartialObject(f.node.Handle(), off, uint32(len(dest)), b)
 	if err != nil {

fs/fs.go

@@ -501,22 +501,21 @@ func (n *folderNode) Create(name string, flags uint32, mode uint32, context *fus
 			return nil, nil, fuse.EIO
 		}
 
-		if err := n.fs.dev.AndroidBeginEditObject(handle); err != nil {
-			log.Println("AndroidBeginEditObject failed:", err)
-			return nil, nil, fuse.EIO
-		}
-
-		node = &androidNode{
+		aNode := &androidNode{
 			mtpNodeImpl: mtpNodeImpl{
 				obj:    &obj,
 				fs:     n.fs,
 				handle: handle,
 			},
-			write: true,
+		}
+
+		if !aNode.startEdit() {
+			return nil, nil, fuse.EIO
 		}
 		file = &androidFile{
-			node: node.(*androidNode),
+			node: aNode,
 		}
+		node = aNode
 	} else {
 		var err error
 		file, node, err = n.fs.createClassicFile(obj)