ext: inode implementations.

PiperOrigin-RevId: 260624470

1 files changed, 36 insertions, 0 deletions

diff --git a/pkg/sentry/fs/ext/directory.go b/pkg/sentry/fs/ext/directory.go
new file mode 100644
index 000000000..ab2b59e44
--- /dev/null
+++ b/pkg/sentry/fs/ext/directory.go
@@ -0,0 +1,36 @@
+// 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
+
+// directory represents a directory inode. It holds the childList in memory.
+type directory struct {
+	inode inode
+
+	// childList is a list containing (1) child Dentries and (2) fake Dentries
+	// (with inode == nil) that represent the iteration position of
+	// directoryFDs. childList is used to support directoryFD.IterDirents()
+	// efficiently. childList is immutable.
+	childList dentryList
+
+	// TODO(b/134676337): Add directory navigators.
+}
+
+// newDirectroy is the directory constructor.
+func newDirectroy(inode inode) *directory {
+	// TODO(b/134676337): initialize childList.
+	file := &directory{inode: inode}
+	file.inode.impl = file
+	return file
+}