fs: implement FileIoctler for loopbackDirStream

Change-Id: Ie39678e7cd97cbbc0d549aa4b74975afdc18abff

Author: WeidiDeng

fs/dirstream.go

@@ -8,8 +8,10 @@ import (
 	"context"
 	"sync"
 	"syscall"
+	"unsafe"
 
 	"github.com/hanwen/go-fuse/v2/fuse"
+	"github.com/hanwen/go-fuse/v2/internal/ioctl"
 	"golang.org/x/sys/unix"
 )
 
@@ -202,6 +204,24 @@ func (ds *loopbackDirStream) Next() (fuse.DirEntry, syscall.Errno) {
 	return res, 0
 }
 
+var _ = (FileIoctler)((*loopbackDirStream)(nil))
+
+func (ds *loopbackDirStream) Ioctl(ctx context.Context, cmd uint32, arg uint64, input []byte, output []byte) (result int32, errno syscall.Errno) {
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
+
+	argWord := uintptr(arg)
+	ioc := ioctl.Command(cmd)
+	if ioc.Read() {
+		argWord = uintptr(unsafe.Pointer(&input[0]))
+	} else if ioc.Write() {
+		argWord = uintptr(unsafe.Pointer(&output[0]))
+	}
+
+	res, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(ds.fd), uintptr(cmd), argWord)
+	return int32(res), errno
+}
+
 func (ds *loopbackDirStream) load() {
 	if len(ds.todo) > 0 {
 		return

fs/loopback_linux_test.go

@@ -341,7 +341,7 @@ func flipNoAtime(fd uintptr) (bool, error) {
 	return before, nil
 }
 
-func TestIoctlLoopback(t *testing.T) {
+func TestIoctlLoopbackFile(t *testing.T) {
 	tc := newTestCase(t, &testOptions{attrCache: true, entryCache: true})
 
 	f, err := os.Create(tc.origDir + "/file")
@@ -366,3 +366,33 @@ func TestIoctlLoopback(t *testing.T) {
 		t.Fatalf("didn't work: after %v, before %v", after, before)
 	}
 }
+
+func TestIoctlLoopbackDir(t *testing.T) {
+	tc := newTestCase(t, &testOptions{attrCache: true, entryCache: true})
+
+	err := os.Mkdir(tc.origDir+"/dir", 0777)
+	if err != nil {
+		t.Fatal(err)
+	}
+	d, err := os.Open(tc.origDir + "/dir")
+	if err != nil {
+		t.Fatal(err)
+	}
+	before, err := flipNoAtime(d.Fd())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	d.Close()
+
+	d, err = os.Open(tc.mntDir + "/dir")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer d.Close()
+	after, err := flipNoAtime(d.Fd())
+
+	if after != !before {
+		t.Fatalf("didn't work: after %v, before %v", after, before)
+	}
+}