| /* |
| * 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 android.annotation.WorkerThread; |
| import android.app.Notification; |
| import android.app.NotificationChannel; |
| import android.app.NotificationManager; |
| import android.app.PendingIntent; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.os.Binder; |
| import android.os.Environment; |
| import android.os.FileObserver; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.os.Message; |
| import android.os.ResultReceiver; |
| import android.os.ServiceManager; |
| import android.os.ShellCallback; |
| import android.os.ShellCommand; |
| import android.os.UserHandle; |
| import android.os.storage.StorageManager; |
| import android.os.storage.VolumeInfo; |
| import android.text.format.DateUtils; |
| import android.util.ArrayMap; |
| import android.util.DataUnit; |
| import android.util.Slog; |
| |
| import com.android.internal.messages.nano.SystemMessageProto.SystemMessage; |
| import com.android.internal.notification.SystemNotificationChannels; |
| import com.android.internal.util.DumpUtils; |
| import com.android.internal.util.FrameworkStatsLog; |
| import com.android.internal.util.IndentingPrintWriter; |
| import com.android.server.EventLogTags; |
| import com.android.server.SystemService; |
| import com.android.server.pm.InstructionSets; |
| import com.android.server.pm.PackageManagerService; |
| |
| import dalvik.system.VMRuntime; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.util.Objects; |
| import java.util.UUID; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * Service that monitors and maintains free space on storage volumes. |
| * <p> |
| * As the free space on a volume nears the threshold defined by |
| * {@link StorageManager#getStorageLowBytes(File)}, this service will clear out |
| * cached data to keep the disk from entering this low state. |
| */ |
| public class DeviceStorageMonitorService extends SystemService { |
| private static final String TAG = "DeviceStorageMonitorService"; |
| |
| /** |
| * Extra for {@link android.content.Intent#ACTION_BATTERY_CHANGED}: |
| * Current int sequence number of the update. |
| */ |
| public static final String EXTRA_SEQUENCE = "seq"; |
| |
| private static final int MSG_CHECK = 1; |
| |
| private static final long DEFAULT_LOG_DELTA_BYTES = DataUnit.MEBIBYTES.toBytes(64); |
| private static final long DEFAULT_CHECK_INTERVAL = DateUtils.MINUTE_IN_MILLIS; |
| |
| // com.android.internal.R.string.low_internal_storage_view_text_no_boot |
| // hard codes 250MB in the message as the storage space required for the |
| // boot image. |
| private static final long BOOT_IMAGE_STORAGE_REQUIREMENT = DataUnit.MEBIBYTES.toBytes(250); |
| |
| private NotificationManager mNotifManager; |
| |
| /** Sequence number used for testing */ |
| private final AtomicInteger mSeq = new AtomicInteger(1); |
| /** Forced level used for testing */ |
| private volatile int mForceLevel = State.LEVEL_UNKNOWN; |
| |
| /** Map from storage volume UUID to internal state */ |
| private final ArrayMap<UUID, State> mStates = new ArrayMap<>(); |
| |
| /** |
| * State for a specific storage volume, including the current "level" that |
| * we've alerted the user and apps about. |
| */ |
| private static class State { |
| private static final int LEVEL_UNKNOWN = -1; |
| private static final int LEVEL_NORMAL = 0; |
| private static final int LEVEL_LOW = 1; |
| private static final int LEVEL_FULL = 2; |
| |
| /** Last "level" that we alerted about */ |
| public int level = LEVEL_NORMAL; |
| /** Last {@link File#getUsableSpace()} that we logged about */ |
| public long lastUsableBytes = Long.MAX_VALUE; |
| |
| /** |
| * Test if the given level transition is "entering" a specific level. |
| * <p> |
| * As an example, a transition from {@link #LEVEL_NORMAL} to |
| * {@link #LEVEL_FULL} is considered to "enter" both {@link #LEVEL_LOW} |
| * and {@link #LEVEL_FULL}. |
| */ |
| private static boolean isEntering(int level, int oldLevel, int newLevel) { |
| return newLevel >= level && (oldLevel < level || oldLevel == LEVEL_UNKNOWN); |
| } |
| |
| /** |
| * Test if the given level transition is "leaving" a specific level. |
| * <p> |
| * As an example, a transition from {@link #LEVEL_FULL} to |
| * {@link #LEVEL_NORMAL} is considered to "leave" both |
| * {@link #LEVEL_FULL} and {@link #LEVEL_LOW}. |
| */ |
| private static boolean isLeaving(int level, int oldLevel, int newLevel) { |
| return newLevel < level && (oldLevel >= level || oldLevel == LEVEL_UNKNOWN); |
| } |
| |
| private static String levelToString(int level) { |
| switch (level) { |
| case State.LEVEL_UNKNOWN: return "UNKNOWN"; |
| case State.LEVEL_NORMAL: return "NORMAL"; |
| case State.LEVEL_LOW: return "LOW"; |
| case State.LEVEL_FULL: return "FULL"; |
| default: return Integer.toString(level); |
| } |
| } |
| } |
| |
| private CacheFileDeletedObserver mCacheFileDeletedObserver; |
| |
| /** |
| * This string is used for ServiceManager access to this class. |
| */ |
| static final String SERVICE = "devicestoragemonitor"; |
| |
| private static final String TV_NOTIFICATION_CHANNEL_ID = "devicestoragemonitor.tv"; |
| |
| private final HandlerThread mHandlerThread; |
| private final Handler mHandler; |
| |
| private State findOrCreateState(UUID uuid) { |
| State state = mStates.get(uuid); |
| if (state == null) { |
| state = new State(); |
| mStates.put(uuid, state); |
| } |
| return state; |
| } |
| |
| /** |
| * Core logic that checks the storage state of every mounted private volume. |
| * Since this can do heavy I/O, callers should invoke indirectly using |
| * {@link #MSG_CHECK}. |
| */ |
| @WorkerThread |
| private void check() { |
| final StorageManager storage = getContext().getSystemService(StorageManager.class); |
| final int seq = mSeq.get(); |
| |
| // Check every mounted private volume to see if they're low on space |
| for (VolumeInfo vol : storage.getWritablePrivateVolumes()) { |
| final File file = vol.getPath(); |
| final long fullBytes = storage.getStorageFullBytes(file); |
| final long lowBytes = storage.getStorageLowBytes(file); |
| |
| // Automatically trim cached data when nearing the low threshold; |
| // when it's within 150% of the threshold, we try trimming usage |
| // back to 200% of the threshold. |
| if (file.getUsableSpace() < (lowBytes * 3) / 2) { |
| final PackageManagerService pms = (PackageManagerService) ServiceManager |
| .getService("package"); |
| try { |
| pms.freeStorage(vol.getFsUuid(), lowBytes * 2, 0); |
| } catch (IOException e) { |
| Slog.w(TAG, e); |
| } |
| } |
| |
| // Send relevant broadcasts and show notifications based on any |
| // recently noticed state transitions. |
| final UUID uuid = StorageManager.convert(vol.getFsUuid()); |
| final State state = findOrCreateState(uuid); |
| final long totalBytes = file.getTotalSpace(); |
| final long usableBytes = file.getUsableSpace(); |
| |
| int oldLevel = state.level; |
| int newLevel; |
| if (mForceLevel != State.LEVEL_UNKNOWN) { |
| // When in testing mode, use unknown old level to force sending |
| // of any relevant broadcasts. |
| oldLevel = State.LEVEL_UNKNOWN; |
| newLevel = mForceLevel; |
| } else if (usableBytes <= fullBytes) { |
| newLevel = State.LEVEL_FULL; |
| } else if (usableBytes <= lowBytes) { |
| newLevel = State.LEVEL_LOW; |
| } else if (StorageManager.UUID_DEFAULT.equals(uuid) && !isBootImageOnDisk() |
| && usableBytes < BOOT_IMAGE_STORAGE_REQUIREMENT) { |
| newLevel = State.LEVEL_LOW; |
| } else { |
| newLevel = State.LEVEL_NORMAL; |
| } |
| |
| // Log whenever we notice drastic storage changes |
| if ((Math.abs(state.lastUsableBytes - usableBytes) > DEFAULT_LOG_DELTA_BYTES) |
| || oldLevel != newLevel) { |
| EventLogTags.writeStorageState(uuid.toString(), oldLevel, newLevel, |
| usableBytes, totalBytes); |
| state.lastUsableBytes = usableBytes; |
| } |
| |
| updateNotifications(vol, oldLevel, newLevel); |
| updateBroadcasts(vol, oldLevel, newLevel, seq); |
| |
| state.level = newLevel; |
| } |
| |
| // Loop around to check again in future; we don't remove messages since |
| // there might be an immediate request pending. |
| if (!mHandler.hasMessages(MSG_CHECK)) { |
| mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_CHECK), |
| DEFAULT_CHECK_INTERVAL); |
| } |
| } |
| |
| public DeviceStorageMonitorService(Context context) { |
| super(context); |
| |
| mHandlerThread = new HandlerThread(TAG, android.os.Process.THREAD_PRIORITY_BACKGROUND); |
| mHandlerThread.start(); |
| |
| mHandler = new Handler(mHandlerThread.getLooper()) { |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case MSG_CHECK: |
| check(); |
| return; |
| } |
| } |
| }; |
| } |
| |
| private static boolean isBootImageOnDisk() { |
| for (String instructionSet : InstructionSets.getAllDexCodeInstructionSets()) { |
| if (!VMRuntime.isBootClassPathOnDisk(instructionSet)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public void onStart() { |
| final Context context = getContext(); |
| mNotifManager = context.getSystemService(NotificationManager.class); |
| |
| mCacheFileDeletedObserver = new CacheFileDeletedObserver(); |
| mCacheFileDeletedObserver.startWatching(); |
| |
| // Ensure that the notification channel is set up |
| PackageManager packageManager = context.getPackageManager(); |
| boolean isTv = packageManager.hasSystemFeature(PackageManager.FEATURE_LEANBACK); |
| |
| if (isTv) { |
| mNotifManager.createNotificationChannel(new NotificationChannel( |
| TV_NOTIFICATION_CHANNEL_ID, |
| context.getString( |
| com.android.internal.R.string.device_storage_monitor_notification_channel), |
| NotificationManager.IMPORTANCE_HIGH)); |
| } |
| |
| publishBinderService(SERVICE, mRemoteService); |
| publishLocalService(DeviceStorageMonitorInternal.class, mLocalService); |
| |
| // Kick off pass to examine storage state |
| mHandler.removeMessages(MSG_CHECK); |
| mHandler.obtainMessage(MSG_CHECK).sendToTarget(); |
| } |
| |
| private final DeviceStorageMonitorInternal mLocalService = new DeviceStorageMonitorInternal() { |
| @Override |
| public void checkMemory() { |
| // Kick off pass to examine storage state |
| mHandler.removeMessages(MSG_CHECK); |
| mHandler.obtainMessage(MSG_CHECK).sendToTarget(); |
| } |
| |
| @Override |
| public boolean isMemoryLow() { |
| return Environment.getDataDirectory().getUsableSpace() < getMemoryLowThreshold(); |
| } |
| |
| @Override |
| public long getMemoryLowThreshold() { |
| return getContext().getSystemService(StorageManager.class) |
| .getStorageLowBytes(Environment.getDataDirectory()); |
| } |
| }; |
| |
| private final Binder mRemoteService = new Binder() { |
| @Override |
| protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| if (!DumpUtils.checkDumpPermission(getContext(), TAG, pw)) return; |
| dumpImpl(fd, pw, args); |
| } |
| |
| @Override |
| public void onShellCommand(FileDescriptor in, FileDescriptor out, |
| FileDescriptor err, String[] args, ShellCallback callback, |
| ResultReceiver resultReceiver) { |
| (new Shell()).exec(this, in, out, err, args, callback, resultReceiver); |
| } |
| }; |
| |
| class Shell extends ShellCommand { |
| @Override |
| public int onCommand(String cmd) { |
| return onShellCommand(this, cmd); |
| } |
| |
| @Override |
| public void onHelp() { |
| PrintWriter pw = getOutPrintWriter(); |
| dumpHelp(pw); |
| } |
| } |
| |
| static final int OPTION_FORCE_UPDATE = 1<<0; |
| |
| int parseOptions(Shell shell) { |
| String opt; |
| int opts = 0; |
| while ((opt = shell.getNextOption()) != null) { |
| if ("-f".equals(opt)) { |
| opts |= OPTION_FORCE_UPDATE; |
| } |
| } |
| return opts; |
| } |
| |
| int onShellCommand(Shell shell, String cmd) { |
| if (cmd == null) { |
| return shell.handleDefaultCommands(cmd); |
| } |
| PrintWriter pw = shell.getOutPrintWriter(); |
| switch (cmd) { |
| case "force-low": { |
| int opts = parseOptions(shell); |
| getContext().enforceCallingOrSelfPermission( |
| android.Manifest.permission.DEVICE_POWER, null); |
| mForceLevel = State.LEVEL_LOW; |
| int seq = mSeq.incrementAndGet(); |
| if ((opts & OPTION_FORCE_UPDATE) != 0) { |
| mHandler.removeMessages(MSG_CHECK); |
| mHandler.obtainMessage(MSG_CHECK).sendToTarget(); |
| pw.println(seq); |
| } |
| } break; |
| case "force-not-low": { |
| int opts = parseOptions(shell); |
| getContext().enforceCallingOrSelfPermission( |
| android.Manifest.permission.DEVICE_POWER, null); |
| mForceLevel = State.LEVEL_NORMAL; |
| int seq = mSeq.incrementAndGet(); |
| if ((opts & OPTION_FORCE_UPDATE) != 0) { |
| mHandler.removeMessages(MSG_CHECK); |
| mHandler.obtainMessage(MSG_CHECK).sendToTarget(); |
| pw.println(seq); |
| } |
| } break; |
| case "reset": { |
| int opts = parseOptions(shell); |
| getContext().enforceCallingOrSelfPermission( |
| android.Manifest.permission.DEVICE_POWER, null); |
| mForceLevel = State.LEVEL_UNKNOWN; |
| int seq = mSeq.incrementAndGet(); |
| if ((opts & OPTION_FORCE_UPDATE) != 0) { |
| mHandler.removeMessages(MSG_CHECK); |
| mHandler.obtainMessage(MSG_CHECK).sendToTarget(); |
| pw.println(seq); |
| } |
| } break; |
| default: |
| return shell.handleDefaultCommands(cmd); |
| } |
| return 0; |
| } |
| |
| static void dumpHelp(PrintWriter pw) { |
| pw.println("Device storage monitor service (devicestoragemonitor) commands:"); |
| pw.println(" help"); |
| pw.println(" Print this help text."); |
| pw.println(" force-low [-f]"); |
| pw.println(" Force storage to be low, freezing storage state."); |
| pw.println(" -f: force a storage change broadcast be sent, prints new sequence."); |
| pw.println(" force-not-low [-f]"); |
| pw.println(" Force storage to not be low, freezing storage state."); |
| pw.println(" -f: force a storage change broadcast be sent, prints new sequence."); |
| pw.println(" reset [-f]"); |
| pw.println(" Unfreeze storage state, returning to current real values."); |
| pw.println(" -f: force a storage change broadcast be sent, prints new sequence."); |
| } |
| |
| void dumpImpl(FileDescriptor fd, PrintWriter _pw, String[] args) { |
| final IndentingPrintWriter pw = new IndentingPrintWriter(_pw, " "); |
| if (args == null || args.length == 0 || "-a".equals(args[0])) { |
| final StorageManager storage = getContext().getSystemService(StorageManager.class); |
| pw.println("Known volumes:"); |
| pw.increaseIndent(); |
| for (int i = 0; i < mStates.size(); i++) { |
| final UUID uuid = mStates.keyAt(i); |
| final State state = mStates.valueAt(i); |
| if (StorageManager.UUID_DEFAULT.equals(uuid)) { |
| pw.println("Default:"); |
| } else { |
| pw.println(uuid + ":"); |
| } |
| pw.increaseIndent(); |
| pw.printPair("level", State.levelToString(state.level)); |
| pw.printPair("lastUsableBytes", state.lastUsableBytes); |
| pw.println(); |
| for (VolumeInfo vol : storage.getWritablePrivateVolumes()) { |
| final File file = vol.getPath(); |
| final UUID innerUuid = StorageManager.convert(vol.getFsUuid()); |
| if (Objects.equals(uuid, innerUuid)) { |
| pw.print("lowBytes="); |
| pw.print(storage.getStorageLowBytes(file)); |
| pw.print(" fullBytes="); |
| pw.println(storage.getStorageFullBytes(file)); |
| pw.print("path="); |
| pw.println(file); |
| break; |
| } |
| } |
| pw.decreaseIndent(); |
| } |
| pw.decreaseIndent(); |
| pw.println(); |
| |
| pw.printPair("mSeq", mSeq.get()); |
| pw.printPair("mForceState", State.levelToString(mForceLevel)); |
| pw.println(); |
| pw.println(); |
| |
| } else { |
| Shell shell = new Shell(); |
| shell.exec(mRemoteService, null, fd, null, args, null, new ResultReceiver(null)); |
| } |
| } |
| |
| private void updateNotifications(VolumeInfo vol, int oldLevel, int newLevel) { |
| final Context context = getContext(); |
| final UUID uuid = StorageManager.convert(vol.getFsUuid()); |
| |
| if (State.isEntering(State.LEVEL_LOW, oldLevel, newLevel)) { |
| Intent lowMemIntent = new Intent(StorageManager.ACTION_MANAGE_STORAGE); |
| lowMemIntent.putExtra(StorageManager.EXTRA_UUID, uuid); |
| lowMemIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); |
| |
| final CharSequence title = context.getText( |
| com.android.internal.R.string.low_internal_storage_view_title); |
| |
| final CharSequence details; |
| if (StorageManager.UUID_DEFAULT.equals(uuid)) { |
| details = context.getText(isBootImageOnDisk() |
| ? com.android.internal.R.string.low_internal_storage_view_text |
| : com.android.internal.R.string.low_internal_storage_view_text_no_boot); |
| } else { |
| details = context.getText( |
| com.android.internal.R.string.low_internal_storage_view_text); |
| } |
| |
| PendingIntent intent = PendingIntent.getActivityAsUser(context, 0, lowMemIntent, 0, |
| null, UserHandle.CURRENT); |
| Notification notification = |
| new Notification.Builder(context, SystemNotificationChannels.ALERTS) |
| .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) |
| .extend(new Notification.TvExtender() |
| .setChannelId(TV_NOTIFICATION_CHANNEL_ID)) |
| .build(); |
| notification.flags |= Notification.FLAG_NO_CLEAR; |
| mNotifManager.notifyAsUser(uuid.toString(), SystemMessage.NOTE_LOW_STORAGE, |
| notification, UserHandle.ALL); |
| FrameworkStatsLog.write(FrameworkStatsLog.LOW_STORAGE_STATE_CHANGED, |
| Objects.toString(vol.getDescription()), |
| FrameworkStatsLog.LOW_STORAGE_STATE_CHANGED__STATE__ON); |
| } else if (State.isLeaving(State.LEVEL_LOW, oldLevel, newLevel)) { |
| mNotifManager.cancelAsUser(uuid.toString(), SystemMessage.NOTE_LOW_STORAGE, |
| UserHandle.ALL); |
| FrameworkStatsLog.write(FrameworkStatsLog.LOW_STORAGE_STATE_CHANGED, |
| Objects.toString(vol.getDescription()), |
| FrameworkStatsLog.LOW_STORAGE_STATE_CHANGED__STATE__OFF); |
| } |
| } |
| |
| private void updateBroadcasts(VolumeInfo vol, int oldLevel, int newLevel, int seq) { |
| if (!Objects.equals(StorageManager.UUID_PRIVATE_INTERNAL, vol.getFsUuid())) { |
| // We don't currently send broadcasts for secondary volumes |
| return; |
| } |
| |
| final Intent lowIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_LOW) |
| .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT |
| | Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND |
| | Intent.FLAG_RECEIVER_VISIBLE_TO_INSTANT_APPS) |
| .putExtra(EXTRA_SEQUENCE, seq); |
| final Intent notLowIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_OK) |
| .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT |
| | Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND |
| | Intent.FLAG_RECEIVER_VISIBLE_TO_INSTANT_APPS) |
| .putExtra(EXTRA_SEQUENCE, seq); |
| |
| if (State.isEntering(State.LEVEL_LOW, oldLevel, newLevel)) { |
| getContext().sendStickyBroadcastAsUser(lowIntent, UserHandle.ALL); |
| } else if (State.isLeaving(State.LEVEL_LOW, oldLevel, newLevel)) { |
| getContext().removeStickyBroadcastAsUser(lowIntent, UserHandle.ALL); |
| getContext().sendBroadcastAsUser(notLowIntent, UserHandle.ALL); |
| } |
| |
| final Intent fullIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_FULL) |
| .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT) |
| .putExtra(EXTRA_SEQUENCE, seq); |
| final Intent notFullIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_NOT_FULL) |
| .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT) |
| .putExtra(EXTRA_SEQUENCE, seq); |
| |
| if (State.isEntering(State.LEVEL_FULL, oldLevel, newLevel)) { |
| getContext().sendStickyBroadcastAsUser(fullIntent, UserHandle.ALL); |
| } else if (State.isLeaving(State.LEVEL_FULL, oldLevel, newLevel)) { |
| getContext().removeStickyBroadcastAsUser(fullIntent, UserHandle.ALL); |
| getContext().sendBroadcastAsUser(notFullIntent, 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); |
| } |
| } |
| } |
