From 77165f118a57143cfccf9522678cf0b3d179bfd9 Mon Sep 17 00:00:00 2001
From: Aaron Jacobs <jacobsa@google.com>
Date: Fri, 6 Mar 2015 23:27:10 -0600
Subject: [PATCH] Added an Unlink method.

---
 file_system.go | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/file_system.go b/file_system.go
index 84d90a0..d8fd3ac 100644
--- a/file_system.go
+++ b/file_system.go
@@ -118,6 +118,15 @@ type FileSystem interface {
 		ctx context.Context,
 		req *RmDirRequest) (*RmDirResponse, error)
 
+	// Unlink a file from its parent. If this brings the inode's link count to
+	// zero, the inode should be deleted once the kernel calls ForgetInode. It
+	// may still be referenced before then if a user still has the file open.
+	//
+	// Sample implementation in ext2: ext2_unlink (http://goo.gl/hY6r6C)
+	Unlink(
+		ctx context.Context,
+		req *UnlinkRequest) (*UnlinkResponse, error)
+
 	///////////////////////////////////
 	// Directory handles
 	///////////////////////////////////
@@ -515,6 +524,18 @@ type RmDirRequest struct {
 	Name   string
 }
 
+type UnlinkResponse struct {
+}
+
+type UnlinkRequest struct {
+	Header RequestHeader
+
+	// The ID of parent directory inode, and the name of the file being removed
+	// within it.
+	Parent InodeID
+	Name   string
+}
+
 type RmDirResponse struct {
 }