fusefronted: report plaintext size on symlink creation

gocryptfs 2.0 introduced the regression that the size
reported at symlink creation was the ciphertext size,
which is wrong.

Report the plaintext size.

Fixes https://github.com/rfjakob/gocryptfs/issues/574

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/matrix/matrix_test.go b/tests/matrix/matrix_test.go
index ec4c092..6622213 100644
--- a/tests/matrix/matrix_test.go
+++ b/tests/matrix/matrix_test.go
@@ -19,6 +19,7 @@ import (
 	"math/rand"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"runtime"
 	"sync"
 	"syscall"
@@ -882,3 +883,21 @@ func TestStatfs(t *testing.T) {
 		t.Errorf("statfs reports size zero: %#v", st)
 	}
 }
+
+// gocryptfs 2.0 reported the ciphertext size on symlink creation, causing
+// confusion: https://github.com/rfjakob/gocryptfs/issues/574
+func TestSymlinkSize(t *testing.T) {
+	p := filepath.Join(test_helpers.DefaultPlainDir, t.Name())
+	// SYMLINK reports the size to the kernel
+	if err := syscall.Symlink("foo", p); err != nil {
+		t.Fatal(err)
+	}
+	// Kernel serves us this value from the attr cache
+	var st syscall.Stat_t
+	if err := syscall.Lstat(p, &st); err != nil {
+		t.Fatal(err)
+	}
+	if st.Size != 3 {
+		t.Errorf("wrong size: have %d, want %d", st.Size, 3)
+	}
+}