From 71c56f6dd5c4bf134342db08fe03cdc61714c5bd Mon Sep 17 00:00:00 2001
From: Daniel Rosenberg <drosen@google.com>
Date: Fri, 28 Apr 2017 01:11:35 +0000
Subject: [PATCH] Revert "Revert "Stop dropping caches now we have kernel fix""

This reverts commit 8ad0bef7b5b1b6e1ba3afe441d2dcc9a06e782a7.

Bug: 37231161
Test: Boot device with FBE enabled. ls /storage/emulated/0/Android
Unlock device. ls /storage/emulated/0/Android
1st will not be found. Second should be found.

Change-Id: I92c7ad0adaa7bd357e10661a47cc667ac0ff84b4
---
 KeyUtil.cpp | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/KeyUtil.cpp b/KeyUtil.cpp
index 4d507a1..fe0f3cb 100644
--- a/KeyUtil.cpp
+++ b/KeyUtil.cpp
@@ -111,13 +111,6 @@ bool installKey(const std::string& key, std::string* raw_ref) {
     LOG(DEBUG) << "Added key " << key_id << " (" << ref << ") to keyring " << device_keyring
                << " in process " << getpid();
 
-    // *TODO* Remove this code when kernel is fixed - see b/28373400
-    // Kernel preserves caches across a key insertion with ext4ice, which leads
-    // to contradictory dirents
-    if (!android::base::WriteStringToFile("3", "/proc/sys/vm/drop_caches")) {
-        PLOG(ERROR) << "Failed to drop_caches";
-    }
-
     return true;
 }