From 632b1e612010e42a6a4279d1567a1a33ea29741d Mon Sep 17 00:00:00 2001
From: Aaron Jacobs <jacobsa@google.com>
Date: Fri, 6 Mar 2015 05:45:17 +1100
Subject: [PATCH] Added FileSystem.SetInodeAttributes.

---
 file_system.go              | 27 ++++++++++++++++++++++++++-
 samples/memfs/memfs_test.go |  8 ++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/file_system.go b/file_system.go
index 0588966..d67fcee 100644
--- a/file_system.go
+++ b/file_system.go
@@ -57,6 +57,14 @@ type FileSystem interface {
 		ctx context.Context,
 		req *GetInodeAttributesRequest) (*GetInodeAttributesResponse, error)
 
+	// Change attributes for an inode.
+	//
+	// The kernel calls this for obvious cases like chmod(2), and for less
+	// obvious cases like ftrunctate(2).
+	SetInodeAttributes(
+		ctx context.Context,
+		req *SetInodeAttributesRequest) (*SetInodeAttributesResponse, error)
+
 	// Forget an inode ID previously issued (e.g. by LookUpInode or MkDir). The
 	// kernel calls this when removing an inode from its internal caches.
 	ForgetInode(
@@ -413,7 +421,24 @@ type GetInodeAttributesRequest struct {
 
 type GetInodeAttributesResponse struct {
 	// Attributes for the inode, and the time at which they should expire. See
-	// notes on LookUpInodeResponse.AttributesExpiration for more.
+	// notes on ChildInodeEntry.AttributesExpiration for more.
+	Attributes           InodeAttributes
+	AttributesExpiration time.Time
+}
+
+type SetInodeAttributesRequest struct {
+	Header RequestHeader
+
+	// The inode of interest.
+	Inode InodeID
+
+	// The attributes to modify, or nil for attributes that don't need a change.
+	Size *uint64
+}
+
+type SetInodeAttributesResponse struct {
+	// The new attributes for the inode, and the time at which they should
+	// expire. See notes on ChildInodeEntry.AttributesExpiration for more.
 	Attributes           InodeAttributes
 	AttributesExpiration time.Time
 }
diff --git a/samples/memfs/memfs_test.go b/samples/memfs/memfs_test.go
index 0fa821a..10678ad 100644
--- a/samples/memfs/memfs_test.go
+++ b/samples/memfs/memfs_test.go
@@ -856,3 +856,11 @@ func (t *MemFSTest) ReadsPastEndOfFile() {
 	ExpectEq(0, n)
 	ExpectEq("", string(buf[:n]))
 }
+
+func (t *MemFSTest) Chmod() {
+	AssertTrue(false, "TODO")
+}
+
+func (t *MemFSTest) Chtimes() {
+	AssertTrue(false, "TODO")
+}