v2api/reverse: implement Statfs

internal/fusefrontend_reverse/node.go

@@ -177,3 +177,17 @@ func (n *Node) Open(ctx context.Context, flags uint32) (fh fs.FileHandle, fuseFl
 	}
 	return
 }
+
+// StatFs - FUSE call. Returns information about the filesystem.
+//
+// Symlink-safe because the path is ignored.
+func (n *Node) Statfs(ctx context.Context, out *fuse.StatfsOut) syscall.Errno {
+	p := n.rootNode().args.Cipherdir
+	var st syscall.Statfs_t
+	err := syscall.Statfs(p, &st)
+	if err != nil {
+		return fs.ToErrno(err)
+	}
+	out.FromStatfsT(&st)
+	return 0
+}

internal/fusefrontend_reverse/node_api_check.go

@@ -10,9 +10,9 @@ var _ = (fs.NodeLookuper)((*Node)(nil))
 var _ = (fs.NodeReaddirer)((*Node)(nil))
 var _ = (fs.NodeReadlinker)((*Node)(nil))
 var _ = (fs.NodeOpener)((*Node)(nil))
+var _ = (fs.NodeStatfser)((*Node)(nil))
 
 /* TODO
-var _ = (fs.NodeStatfser)((*Node)(nil))
 var _ = (fs.NodeGetxattrer)((*Node)(nil))
 var _ = (fs.NodeListxattrer)((*Node)(nil))
 */

tests/matrix/matrix_test.go

@@ -873,3 +873,11 @@ func TestAccess(t *testing.T) {
 		t.Error("X_OK should have failed")
 	}
 }
+
+func TestStatfs(t *testing.T) {
+	var st syscall.Statfs_t
+	syscall.Statfs(test_helpers.DefaultPlainDir, &st)
+	if st.Bsize == 0 {
+		t.Errorf("statfs reports size zero: %#v", st)
+	}
+}

tests/reverse/correctness_test.go

@@ -249,3 +249,11 @@ func Test0100Dir(t *testing.T) {
 	}
 	fd.Close()
 }
+
+func TestStatfs(t *testing.T) {
+	var st syscall.Statfs_t
+	syscall.Statfs(dirB, &st)
+	if st.Bsize == 0 {
+		t.Errorf("statfs reports size zero: %#v", st)
+	}
+}