1 files changed, 56 insertions, 0 deletions
diff --git a/pkg/sentry/fsimpl/ext/dentry.go b/pkg/sentry/fsimpl/ext/dentry.go
new file mode 100644
index 000000000..054fb42b6
--- /dev/null
+++ b/pkg/sentry/fsimpl/ext/dentry.go
@@ -0,0 +1,56 @@
+// Copyright 2019 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ext
+
+import (
+	"gvisor.dev/gvisor/pkg/sentry/vfs"
+)
+
+// dentry implements vfs.DentryImpl.
+type dentry struct {
+	vfsd vfs.Dentry
+
+	// inode is the inode represented by this dentry. Multiple Dentries may
+	// share a single non-directory Inode (with hard links). inode is
+	// immutable.
+	inode *inode
+}
+
+// Compiles only if dentry implements vfs.DentryImpl.
+var _ vfs.DentryImpl = (*dentry)(nil)
+
+// newDentry is the dentry constructor.
+func newDentry(in *inode) *dentry {
+	d := &dentry{
+		inode: in,
+	}
+	d.vfsd.Init(d)
+	return d
+}
+
+// IncRef implements vfs.DentryImpl.IncRef.
+func (d *dentry) IncRef(vfsfs *vfs.Filesystem) {
+	d.inode.incRef()
+}
+
+// TryIncRef implements vfs.DentryImpl.TryIncRef.
+func (d *dentry) TryIncRef(vfsfs *vfs.Filesystem) bool {
+	return d.inode.tryIncRef()
+}
+
+// DecRef implements vfs.DentryImpl.DecRef.
+func (d *dentry) DecRef(vfsfs *vfs.Filesystem) {
+	d.inode.decRef(vfsfs.Impl().(*filesystem))
+}