Merge "Pinner service for pinning files into memory" into nyc-dev

am: b41088b4df

* commit 'b41088b4dfa8b077541cd3be69c51bd4bba4e938':
  Pinner service for pinning files into memory

Change-Id: I404f6844fb5bf4a097d3d862a9294cb58484d176

core/java/com/android/internal/os/ZygoteInit.java

@@ -549,6 +549,7 @@ public class ZygoteInit {
     private static boolean startSystemServer(String abiList, String socketName)
             throws MethodAndArgsCaller, RuntimeException {
         long capabilities = posixCapabilitiesAsBits(
+            OsConstants.CAP_IPC_LOCK,
             OsConstants.CAP_KILL,
             OsConstants.CAP_NET_ADMIN,
             OsConstants.CAP_NET_BIND_SERVICE,

core/res/res/values/config.xml

@@ -2476,4 +2476,9 @@
 
     <!-- True if the device supports persisting security logs across reboots. -->
     <bool name="config_supportPreRebootSecurityLogs">false</bool>
+
+    <!-- Default files to pin via Pinner Service -->
+    <string-array translatable="false" name="config_defaultPinnerServiceFiles">
+    </string-array>
+
 </resources>

core/res/res/values/symbols.xml

@@ -2587,4 +2587,8 @@
   <java-symbol type="string" name="config_tvRemoteServicePackage" />
 
   <java-symbol type="bool" name="config_supportPreRebootSecurityLogs" />
+
+  <!-- Pinner Service -->
+  <java-symbol type="array" name="config_defaultPinnerServiceFiles" />
+
 </resources>

services/core/java/com/android/server/PinnerService.java

@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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 com.android.server;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.content.res.Resources;
+import android.util.EventLog;
+import android.util.Slog;
+import android.os.Binder;
+import android.os.Build;
+import android.system.ErrnoException;
+import android.system.Os;
+import android.system.OsConstants;
+import android.system.StructStat;
+
+import java.util.ArrayList;
+import java.io.FileDescriptor;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * <p>PinnerService pins important files for key processes in memory.</p>
+ * <p>Files to pin are specified in the config_defaultPinnerServiceFiles
+ * overlay. </p>
+ */
+public final class PinnerService extends SystemService {
+    private static final boolean DEBUG = false;
+    private static final String TAG = "PinnerService";
+
+    private final Context mContext;
+    private final ArrayList<String> mPinnedFiles = new ArrayList<String>();
+
+    private BinderService mBinderService;
+
+
+    public PinnerService(Context context) {
+        super(context);
+
+        mContext = context;
+
+    }
+
+    @Override
+    public void onStart() {
+        Slog.e(TAG, "Starting PinnerService");
+
+        mBinderService = new BinderService();
+        publishBinderService("pinner", mBinderService);
+
+        // Files to pin come from the overlay and can be specified per-device config
+        // Continue trying to pin remaining files even if there is a failure
+        String[] filesToPin = mContext.getResources().getStringArray(com.android.internal.R.array.config_defaultPinnerServiceFiles);
+        for (int i = 0; i < filesToPin.length; i++){
+            boolean success = pinFile(filesToPin[i], 0, 0);
+            if (success == true) {
+                mPinnedFiles.add(filesToPin[i]);
+                Slog.i(TAG, "Pinned file = " + filesToPin[i]);
+            } else {
+                Slog.e(TAG, "Failed to pin file = " + filesToPin[i]);
+            }
+        }
+    }
+
+    // mlock length bytes of fileToPin in memory, starting at offset
+    // length == 0 means pin from offset to end of file
+    private boolean pinFile(String fileToPin, long offset, long length) {
+        FileDescriptor fd = new FileDescriptor();
+        try {
+            fd = Os.open(fileToPin, OsConstants.O_RDONLY | OsConstants.O_CLOEXEC | OsConstants.O_NOFOLLOW, OsConstants.O_RDONLY);
+
+            StructStat sb = Os.fstat(fd);
+
+            if (offset + length > sb.st_size) {
+                Os.close(fd);
+                return false;
+            }
+
+            if (length == 0) {
+                length = sb.st_size - offset;
+            }
+
+            long address = Os.mmap(0, length, OsConstants.PROT_READ, OsConstants.MAP_PRIVATE, fd, offset);
+            Os.close(fd);
+
+            Os.mlock(address, length);
+
+            return true;
+        } catch (ErrnoException e) {
+            Slog.e(TAG, "Failed to pin file " + fileToPin + " with error " + e.getMessage());
+            if(fd.valid()) {
+                try { Os.close(fd); }
+                catch (ErrnoException eClose) {Slog.e(TAG, "Failed to close fd, error = " + eClose.getMessage());}
+            }
+            return false;
+        }
+    }
+
+
+    private final class BinderService extends Binder {
+        @Override
+        protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+            mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG);
+            pw.println("Pinned Files:");
+            for (int i = 0; i < mPinnedFiles.size(); i++) {
+                pw.println(mPinnedFiles.get(i));
+            }
+        }
+    }
+}

services/java/com/android/server/SystemServer.java

@@ -643,6 +643,10 @@ public final class SystemServer {
             traceBeginAndSlog("ConnectivityMetricsLoggerService");
             mSystemServiceManager.startService(MetricsLoggerService.class);
             Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
+
+            traceBeginAndSlog("PinnerService");
+            mSystemServiceManager.startService(PinnerService.class);
+            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
         } catch (RuntimeException e) {
             Slog.e("System", "******************************************");
             Slog.e("System", "************ Failure starting core service", e);