fuse/pathfs: fix confusion between atime and mtime in loopbackFileSystem.Utimens.

fuse/pathfs/loopback_linux.go

@@ -70,7 +70,7 @@ func (fs *loopbackFileSystem) Utimens(path string, a *time.Time, m *time.Time, c
 	if m == nil {
 		ts[1].Nsec = _UTIME_OMIT
 	} else {
-		ts[1] = syscall.NsecToTimespec(a.UnixNano())
+		ts[1] = syscall.NsecToTimespec(m.UnixNano())
 		ts[1].Nsec = 0
 	}
 

fuse/test/loopback_linux_test.go

@@ -27,8 +27,11 @@ func TestTouch(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Lstat failed: %v", err)
 	}
-	if stat.Atim.Sec != 42 || stat.Mtim.Sec != 43 {
-		t.Errorf("Got wrong timestamps %v", stat)
+	if stat.Atim.Sec != 42 {
+		t.Errorf("Got atime.sec %d, want 42. Stat_t was %#v", stat.Atim.Sec, stat)
+	}
+	if stat.Mtim.Sec != 43 {
+		t.Errorf("Got mtime.sec %d, want 43. Stat_t was %#v", stat.Mtim.Sec, stat)
 	}
 }