| /* |
| * Copyright (C) 2007-2008 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.storage; |
| |
| import com.android.server.EventLogTags; |
| import com.android.server.SystemService; |
| import com.android.server.pm.InstructionSets; |
| import android.app.Notification; |
| import android.app.NotificationManager; |
| import android.app.PendingIntent; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.IPackageDataObserver; |
| import android.content.pm.IPackageManager; |
| import android.content.pm.PackageManager; |
| import android.os.Binder; |
| import android.os.Environment; |
| import android.os.FileObserver; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.Message; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.os.StatFs; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.os.UserHandle; |
| import android.os.storage.StorageManager; |
| import android.provider.Settings; |
| import android.text.format.Formatter; |
| import android.util.EventLog; |
| import android.util.Slog; |
| import android.util.TimeUtils; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| |
| import dalvik.system.VMRuntime; |
| |
| /** |
| * This class implements a service to monitor the amount of disk |
| * storage space on the device. If the free storage on device is less |
| * than a tunable threshold value (a secure settings parameter; |
| * default 10%) a low memory notification is displayed to alert the |
| * user. If the user clicks on the low memory notification the |
| * Application Manager application gets launched to let the user free |
| * storage space. |
| * |
| * Event log events: A low memory event with the free storage on |
| * device in bytes is logged to the event log when the device goes low |
| * on storage space. The amount of free storage on the device is |
| * periodically logged to the event log. The log interval is a secure |
| * settings parameter with a default value of 12 hours. When the free |
| * storage differential goes below a threshold (again a secure |
| * settings parameter with a default value of 2MB), the free memory is |
| * logged to the event log. |
| */ |
| public class DeviceStorageMonitorService extends SystemService { |
| static final String TAG = "DeviceStorageMonitorService"; |
| |
| // TODO: extend to watch and manage caches on all private volumes |
| |
| static final boolean DEBUG = false; |
| static final boolean localLOGV = false; |
| |
| static final int DEVICE_MEMORY_WHAT = 1; |
| private static final int MONITOR_INTERVAL = 1; //in minutes |
| private static final int LOW_MEMORY_NOTIFICATION_ID = 1; |
| |
| private static final int DEFAULT_FREE_STORAGE_LOG_INTERVAL_IN_MINUTES = 12*60; //in minutes |
| private static final long DEFAULT_DISK_FREE_CHANGE_REPORTING_THRESHOLD = 2 * 1024 * 1024; // 2MB |
| private static final long DEFAULT_CHECK_INTERVAL = MONITOR_INTERVAL*60*1000; |
| |
| private long mFreeMem; // on /data |
| private long mFreeMemAfterLastCacheClear; // on /data |
| private long mLastReportedFreeMem; |
| private long mLastReportedFreeMemTime; |
| boolean mLowMemFlag=false; |
| private boolean mMemFullFlag=false; |
| private final boolean mIsBootImageOnDisk; |
| private final ContentResolver mResolver; |
| private final long mTotalMemory; // on /data |
| private final StatFs mDataFileStats; |
| private final StatFs mSystemFileStats; |
| private final StatFs mCacheFileStats; |
| |
| private static final File DATA_PATH = Environment.getDataDirectory(); |
| private static final File SYSTEM_PATH = Environment.getRootDirectory(); |
| private static final File CACHE_PATH = Environment.getDownloadCacheDirectory(); |
| |
| private long mThreadStartTime = -1; |
| boolean mClearSucceeded = false; |
| boolean mClearingCache; |
| private final Intent mStorageLowIntent; |
| private final Intent mStorageOkIntent; |
| private final Intent mStorageFullIntent; |
| private final Intent mStorageNotFullIntent; |
| private CachePackageDataObserver mClearCacheObserver; |
| private CacheFileDeletedObserver mCacheFileDeletedObserver; |
| private static final int _TRUE = 1; |
| private static final int _FALSE = 0; |
| // This is the raw threshold that has been set at which we consider |
| // storage to be low. |
| long mMemLowThreshold; |
| // This is the threshold at which we start trying to flush caches |
| // to get below the low threshold limit. It is less than the low |
| // threshold; we will allow storage to get a bit beyond the limit |
| // before flushing and checking if we are actually low. |
| private long mMemCacheStartTrimThreshold; |
| // This is the threshold that we try to get to when deleting cache |
| // files. This is greater than the low threshold so that we will flush |
| // more files than absolutely needed, to reduce the frequency that |
| // flushing takes place. |
| private long mMemCacheTrimToThreshold; |
| private long mMemFullThreshold; |
| |
| /** |
| * This string is used for ServiceManager access to this class. |
| */ |
| static final String SERVICE = "devicestoragemonitor"; |
| |
| /** |
| * Handler that checks the amount of disk space on the device and sends a |
| * notification if the device runs low on disk space |
| */ |
| private final Handler mHandler = new Handler() { |
| @Override |
| public void handleMessage(Message msg) { |
| //don't handle an invalid message |
| if (msg.what != DEVICE_MEMORY_WHAT) { |
| Slog.e(TAG, "Will not process invalid message"); |
| return; |
| } |
| checkMemory(msg.arg1 == _TRUE); |
| } |
| }; |
| |
| private class CachePackageDataObserver extends IPackageDataObserver.Stub { |
| public void onRemoveCompleted(String packageName, boolean succeeded) { |
| mClearSucceeded = succeeded; |
| mClearingCache = false; |
| if(localLOGV) Slog.i(TAG, " Clear succeeded:"+mClearSucceeded |
| +", mClearingCache:"+mClearingCache+" Forcing memory check"); |
| postCheckMemoryMsg(false, 0); |
| } |
| } |
| |
| private void restatDataDir() { |
| try { |
| mDataFileStats.restat(DATA_PATH.getAbsolutePath()); |
| mFreeMem = (long) mDataFileStats.getAvailableBlocks() * |
| mDataFileStats.getBlockSize(); |
| } catch (IllegalArgumentException e) { |
| // use the old value of mFreeMem |
| } |
| // Allow freemem to be overridden by debug.freemem for testing |
| String debugFreeMem = SystemProperties.get("debug.freemem"); |
| if (!"".equals(debugFreeMem)) { |
| mFreeMem = Long.parseLong(debugFreeMem); |
| } |
| // Read the log interval from secure settings |
| long freeMemLogInterval = Settings.Global.getLong(mResolver, |
| Settings.Global.SYS_FREE_STORAGE_LOG_INTERVAL, |
| DEFAULT_FREE_STORAGE_LOG_INTERVAL_IN_MINUTES)*60*1000; |
| //log the amount of free memory in event log |
| long currTime = SystemClock.elapsedRealtime(); |
| if((mLastReportedFreeMemTime == 0) || |
| (currTime-mLastReportedFreeMemTime) >= freeMemLogInterval) { |
| mLastReportedFreeMemTime = currTime; |
| long mFreeSystem = -1, mFreeCache = -1; |
| try { |
| mSystemFileStats.restat(SYSTEM_PATH.getAbsolutePath()); |
| mFreeSystem = (long) mSystemFileStats.getAvailableBlocks() * |
| mSystemFileStats.getBlockSize(); |
| } catch (IllegalArgumentException e) { |
| // ignore; report -1 |
| } |
| try { |
| mCacheFileStats.restat(CACHE_PATH.getAbsolutePath()); |
| mFreeCache = (long) mCacheFileStats.getAvailableBlocks() * |
| mCacheFileStats.getBlockSize(); |
| } catch (IllegalArgumentException e) { |
| // ignore; report -1 |
| } |
| EventLog.writeEvent(EventLogTags.FREE_STORAGE_LEFT, |
| mFreeMem, mFreeSystem, mFreeCache); |
| } |
| // Read the reporting threshold from secure settings |
| long threshold = Settings.Global.getLong(mResolver, |
| Settings.Global.DISK_FREE_CHANGE_REPORTING_THRESHOLD, |
| DEFAULT_DISK_FREE_CHANGE_REPORTING_THRESHOLD); |
| // If mFree changed significantly log the new value |
| long delta = mFreeMem - mLastReportedFreeMem; |
| if (delta > threshold || delta < -threshold) { |
| mLastReportedFreeMem = mFreeMem; |
| EventLog.writeEvent(EventLogTags.FREE_STORAGE_CHANGED, mFreeMem); |
| } |
| } |
| |
| private void clearCache() { |
| if (mClearCacheObserver == null) { |
| // Lazy instantiation |
| mClearCacheObserver = new CachePackageDataObserver(); |
| } |
| mClearingCache = true; |
| try { |
| if (localLOGV) Slog.i(TAG, "Clearing cache"); |
| IPackageManager.Stub.asInterface(ServiceManager.getService("package")). |
| freeStorageAndNotify(null, mMemCacheTrimToThreshold, mClearCacheObserver); |
| } catch (RemoteException e) { |
| Slog.w(TAG, "Failed to get handle for PackageManger Exception: "+e); |
| mClearingCache = false; |
| mClearSucceeded = false; |
| } |
| } |
| |
| void checkMemory(boolean checkCache) { |
| //if the thread that was started to clear cache is still running do nothing till its |
| //finished clearing cache. Ideally this flag could be modified by clearCache |
| // and should be accessed via a lock but even if it does this test will fail now and |
| //hopefully the next time this flag will be set to the correct value. |
| if(mClearingCache) { |
| if(localLOGV) Slog.i(TAG, "Thread already running just skip"); |
| //make sure the thread is not hung for too long |
| long diffTime = System.currentTimeMillis() - mThreadStartTime; |
| if(diffTime > (10*60*1000)) { |
| Slog.w(TAG, "Thread that clears cache file seems to run for ever"); |
| } |
| } else { |
| restatDataDir(); |
| if (localLOGV) Slog.v(TAG, "freeMemory="+mFreeMem); |
| |
| //post intent to NotificationManager to display icon if necessary |
| if (mFreeMem < mMemLowThreshold) { |
| if (checkCache) { |
| // We are allowed to clear cache files at this point to |
| // try to get down below the limit, because this is not |
| // the initial call after a cache clear has been attempted. |
| // In this case we will try a cache clear if our free |
| // space has gone below the cache clear limit. |
| if (mFreeMem < mMemCacheStartTrimThreshold) { |
| // We only clear the cache if the free storage has changed |
| // a significant amount since the last time. |
| if ((mFreeMemAfterLastCacheClear-mFreeMem) |
| >= ((mMemLowThreshold-mMemCacheStartTrimThreshold)/4)) { |
| // See if clearing cache helps |
| // Note that clearing cache is asynchronous and so we do a |
| // memory check again once the cache has been cleared. |
| mThreadStartTime = System.currentTimeMillis(); |
| mClearSucceeded = false; |
| clearCache(); |
| } |
| } |
| } else { |
| // This is a call from after clearing the cache. Note |
| // the amount of free storage at this point. |
| mFreeMemAfterLastCacheClear = mFreeMem; |
| if (!mLowMemFlag) { |
| // We tried to clear the cache, but that didn't get us |
| // below the low storage limit. Tell the user. |
| Slog.i(TAG, "Running low on memory. Sending notification"); |
| sendNotification(); |
| mLowMemFlag = true; |
| } else { |
| if (localLOGV) Slog.v(TAG, "Running low on memory " + |
| "notification already sent. do nothing"); |
| } |
| } |
| } else { |
| mFreeMemAfterLastCacheClear = mFreeMem; |
| if (mLowMemFlag) { |
| Slog.i(TAG, "Memory available. Cancelling notification"); |
| cancelNotification(); |
| mLowMemFlag = false; |
| } |
| } |
| if (!mLowMemFlag && !mIsBootImageOnDisk) { |
| Slog.i(TAG, "No boot image on disk due to lack of space. Sending notification"); |
| sendNotification(); |
| } |
| if (mFreeMem < mMemFullThreshold) { |
| if (!mMemFullFlag) { |
| sendFullNotification(); |
| mMemFullFlag = true; |
| } |
| } else { |
| if (mMemFullFlag) { |
| cancelFullNotification(); |
| mMemFullFlag = false; |
| } |
| } |
| } |
| if(localLOGV) Slog.i(TAG, "Posting Message again"); |
| //keep posting messages to itself periodically |
| postCheckMemoryMsg(true, DEFAULT_CHECK_INTERVAL); |
| } |
| |
| void postCheckMemoryMsg(boolean clearCache, long delay) { |
| // Remove queued messages |
| mHandler.removeMessages(DEVICE_MEMORY_WHAT); |
| mHandler.sendMessageDelayed(mHandler.obtainMessage(DEVICE_MEMORY_WHAT, |
| clearCache ?_TRUE : _FALSE, 0), |
| delay); |
| } |
| |
| public DeviceStorageMonitorService(Context context) { |
| super(context); |
| mLastReportedFreeMemTime = 0; |
| mResolver = context.getContentResolver(); |
| mIsBootImageOnDisk = isBootImageOnDisk(); |
| //create StatFs object |
| mDataFileStats = new StatFs(DATA_PATH.getAbsolutePath()); |
| mSystemFileStats = new StatFs(SYSTEM_PATH.getAbsolutePath()); |
| mCacheFileStats = new StatFs(CACHE_PATH.getAbsolutePath()); |
| //initialize total storage on device |
| mTotalMemory = (long)mDataFileStats.getBlockCount() * |
| mDataFileStats.getBlockSize(); |
| mStorageLowIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_LOW); |
| mStorageLowIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); |
| mStorageOkIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_OK); |
| mStorageOkIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); |
| mStorageFullIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_FULL); |
| mStorageFullIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); |
| mStorageNotFullIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_NOT_FULL); |
| mStorageNotFullIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); |
| } |
| |
| private static boolean isBootImageOnDisk() { |
| for (String instructionSet : InstructionSets.getAllDexCodeInstructionSets()) { |
| if (!VMRuntime.isBootClassPathOnDisk(instructionSet)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Initializes the disk space threshold value and posts an empty message to |
| * kickstart the process. |
| */ |
| @Override |
| public void onStart() { |
| // cache storage thresholds |
| final StorageManager sm = StorageManager.from(getContext()); |
| mMemLowThreshold = sm.getStorageLowBytes(DATA_PATH); |
| mMemFullThreshold = sm.getStorageFullBytes(DATA_PATH); |
| |
| mMemCacheStartTrimThreshold = ((mMemLowThreshold*3)+mMemFullThreshold)/4; |
| mMemCacheTrimToThreshold = mMemLowThreshold |
| + ((mMemLowThreshold-mMemCacheStartTrimThreshold)*2); |
| mFreeMemAfterLastCacheClear = mTotalMemory; |
| checkMemory(true); |
| |
| mCacheFileDeletedObserver = new CacheFileDeletedObserver(); |
| mCacheFileDeletedObserver.startWatching(); |
| |
| publishBinderService(SERVICE, mRemoteService); |
| publishLocalService(DeviceStorageMonitorInternal.class, mLocalService); |
| } |
| |
| private final DeviceStorageMonitorInternal mLocalService = new DeviceStorageMonitorInternal() { |
| @Override |
| public void checkMemory() { |
| // force an early check |
| postCheckMemoryMsg(true, 0); |
| } |
| |
| @Override |
| public boolean isMemoryLow() { |
| return mLowMemFlag || !mIsBootImageOnDisk; |
| } |
| |
| @Override |
| public long getMemoryLowThreshold() { |
| return mMemLowThreshold; |
| } |
| }; |
| |
| private final IBinder mRemoteService = new Binder() { |
| @Override |
| protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP) |
| != PackageManager.PERMISSION_GRANTED) { |
| |
| pw.println("Permission Denial: can't dump " + SERVICE + " from from pid=" |
| + Binder.getCallingPid() |
| + ", uid=" + Binder.getCallingUid()); |
| return; |
| } |
| |
| dumpImpl(pw); |
| } |
| }; |
| |
| void dumpImpl(PrintWriter pw) { |
| final Context context = getContext(); |
| |
| pw.println("Current DeviceStorageMonitor state:"); |
| |
| pw.print(" mFreeMem="); pw.print(Formatter.formatFileSize(context, mFreeMem)); |
| pw.print(" mTotalMemory="); |
| pw.println(Formatter.formatFileSize(context, mTotalMemory)); |
| |
| pw.print(" mFreeMemAfterLastCacheClear="); |
| pw.println(Formatter.formatFileSize(context, mFreeMemAfterLastCacheClear)); |
| |
| pw.print(" mLastReportedFreeMem="); |
| pw.print(Formatter.formatFileSize(context, mLastReportedFreeMem)); |
| pw.print(" mLastReportedFreeMemTime="); |
| TimeUtils.formatDuration(mLastReportedFreeMemTime, SystemClock.elapsedRealtime(), pw); |
| pw.println(); |
| |
| pw.print(" mLowMemFlag="); pw.print(mLowMemFlag); |
| pw.print(" mMemFullFlag="); pw.println(mMemFullFlag); |
| pw.print(" mIsBootImageOnDisk="); pw.print(mIsBootImageOnDisk); |
| |
| pw.print(" mClearSucceeded="); pw.print(mClearSucceeded); |
| pw.print(" mClearingCache="); pw.println(mClearingCache); |
| |
| pw.print(" mMemLowThreshold="); |
| pw.print(Formatter.formatFileSize(context, mMemLowThreshold)); |
| pw.print(" mMemFullThreshold="); |
| pw.println(Formatter.formatFileSize(context, mMemFullThreshold)); |
| |
| pw.print(" mMemCacheStartTrimThreshold="); |
| pw.print(Formatter.formatFileSize(context, mMemCacheStartTrimThreshold)); |
| pw.print(" mMemCacheTrimToThreshold="); |
| pw.println(Formatter.formatFileSize(context, mMemCacheTrimToThreshold)); |
| } |
| |
| /** |
| * This method sends a notification to NotificationManager to display |
| * an error dialog indicating low disk space and launch the Installer |
| * application |
| */ |
| private void sendNotification() { |
| final Context context = getContext(); |
| if(localLOGV) Slog.i(TAG, "Sending low memory notification"); |
| //log the event to event log with the amount of free storage(in bytes) left on the device |
| EventLog.writeEvent(EventLogTags.LOW_STORAGE, mFreeMem); |
| // Pack up the values and broadcast them to everyone |
| Intent lowMemIntent = new Intent(StorageManager.ACTION_MANAGE_STORAGE); |
| lowMemIntent.putExtra("memory", mFreeMem); |
| lowMemIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); |
| NotificationManager mNotificationMgr = |
| (NotificationManager)context.getSystemService( |
| Context.NOTIFICATION_SERVICE); |
| CharSequence title = context.getText( |
| com.android.internal.R.string.low_internal_storage_view_title); |
| CharSequence details = context.getText(mIsBootImageOnDisk |
| ? com.android.internal.R.string.low_internal_storage_view_text |
| : com.android.internal.R.string.low_internal_storage_view_text_no_boot); |
| PendingIntent intent = PendingIntent.getActivityAsUser(context, 0, lowMemIntent, 0, |
| null, UserHandle.CURRENT); |
| Notification notification = new Notification.Builder(context) |
| .setSmallIcon(com.android.internal.R.drawable.stat_notify_disk_full) |
| .setTicker(title) |
| .setColor(context.getColor( |
| com.android.internal.R.color.system_notification_accent_color)) |
| .setContentTitle(title) |
| .setContentText(details) |
| .setContentIntent(intent) |
| .setStyle(new Notification.BigTextStyle() |
| .bigText(details)) |
| .setVisibility(Notification.VISIBILITY_PUBLIC) |
| .setCategory(Notification.CATEGORY_SYSTEM) |
| .build(); |
| notification.flags |= Notification.FLAG_NO_CLEAR; |
| mNotificationMgr.notifyAsUser(null, LOW_MEMORY_NOTIFICATION_ID, notification, |
| UserHandle.ALL); |
| context.sendStickyBroadcastAsUser(mStorageLowIntent, UserHandle.ALL); |
| } |
| |
| /** |
| * Cancels low storage notification and sends OK intent. |
| */ |
| private void cancelNotification() { |
| final Context context = getContext(); |
| if(localLOGV) Slog.i(TAG, "Canceling low memory notification"); |
| NotificationManager mNotificationMgr = |
| (NotificationManager)context.getSystemService( |
| Context.NOTIFICATION_SERVICE); |
| //cancel notification since memory has been freed |
| mNotificationMgr.cancelAsUser(null, LOW_MEMORY_NOTIFICATION_ID, UserHandle.ALL); |
| |
| context.removeStickyBroadcastAsUser(mStorageLowIntent, UserHandle.ALL); |
| context.sendBroadcastAsUser(mStorageOkIntent, UserHandle.ALL); |
| } |
| |
| /** |
| * Send a notification when storage is full. |
| */ |
| private void sendFullNotification() { |
| if(localLOGV) Slog.i(TAG, "Sending memory full notification"); |
| getContext().sendStickyBroadcastAsUser(mStorageFullIntent, UserHandle.ALL); |
| } |
| |
| /** |
| * Cancels memory full notification and sends "not full" intent. |
| */ |
| private void cancelFullNotification() { |
| if(localLOGV) Slog.i(TAG, "Canceling memory full notification"); |
| getContext().removeStickyBroadcastAsUser(mStorageFullIntent, UserHandle.ALL); |
| getContext().sendBroadcastAsUser(mStorageNotFullIntent, UserHandle.ALL); |
| } |
| |
| private static class CacheFileDeletedObserver extends FileObserver { |
| public CacheFileDeletedObserver() { |
| super(Environment.getDownloadCacheDirectory().getAbsolutePath(), FileObserver.DELETE); |
| } |
| |
| @Override |
| public void onEvent(int event, String path) { |
| EventLogTags.writeCacheFileDeleted(path); |
| } |
| } |
| } |
