733 lines
29 KiB
Java
733 lines
29 KiB
Java
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.content.BroadcastReceiver;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.content.pm.PackageManager;
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import android.database.ContentObserver;
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import android.net.Uri;
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import android.os.Debug;
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import android.os.DropBoxManager;
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import android.os.FileUtils;
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import android.os.Handler;
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import android.os.ParcelFileDescriptor;
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import android.os.StatFs;
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import android.os.SystemClock;
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import android.provider.Settings;
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import android.text.format.Time;
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import android.util.Slog;
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import com.android.internal.os.IDropBoxManagerService;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.io.UnsupportedEncodingException;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.SortedSet;
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import java.util.TreeSet;
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import java.util.zip.GZIPOutputStream;
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/**
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* Implementation of {@link IDropBoxManagerService} using the filesystem.
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* Clients use {@link DropBoxManager} to access this service.
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*/
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public final class DropBoxManagerService extends IDropBoxManagerService.Stub {
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private static final String TAG = "DropBoxManagerService";
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private static final int DEFAULT_AGE_SECONDS = 3 * 86400;
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private static final int DEFAULT_MAX_FILES = 1000;
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private static final int DEFAULT_QUOTA_KB = 5 * 1024;
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private static final int DEFAULT_QUOTA_PERCENT = 10;
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private static final int DEFAULT_RESERVE_PERCENT = 10;
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private static final int QUOTA_RESCAN_MILLIS = 5000;
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private static final boolean PROFILE_DUMP = false;
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// TODO: This implementation currently uses one file per entry, which is
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// inefficient for smallish entries -- consider using a single queue file
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// per tag (or even globally) instead.
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// The cached context and derived objects
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private final Context mContext;
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private final ContentResolver mContentResolver;
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private final File mDropBoxDir;
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// Accounting of all currently written log files (set in init()).
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private FileList mAllFiles = null;
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private HashMap<String, FileList> mFilesByTag = null;
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// Various bits of disk information
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private StatFs mStatFs = null;
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private int mBlockSize = 0;
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private int mCachedQuotaBlocks = 0; // Space we can use: computed from free space, etc.
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private long mCachedQuotaUptimeMillis = 0;
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// Ensure that all log entries have a unique timestamp
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private long mLastTimestamp = 0;
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/** Receives events that might indicate a need to clean up files. */
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private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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mCachedQuotaUptimeMillis = 0; // Force a re-check of quota size
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// Run the initialization in the background (not this main thread).
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// The init() and trimToFit() methods are synchronized, so they still
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// block other users -- but at least the onReceive() call can finish.
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new Thread() {
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public void run() {
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try {
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init();
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trimToFit();
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} catch (IOException e) {
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Slog.e(TAG, "Can't init", e);
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}
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}
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}.start();
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}
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};
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/**
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* Creates an instance of managed drop box storage. Normally there is one of these
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* run by the system, but others can be created for testing and other purposes.
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*
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* @param context to use for receiving free space & gservices intents
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* @param path to store drop box entries in
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*/
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public DropBoxManagerService(final Context context, File path) {
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mDropBoxDir = path;
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// Set up intent receivers
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mContext = context;
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mContentResolver = context.getContentResolver();
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context.registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW));
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mContentResolver.registerContentObserver(
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Settings.Secure.CONTENT_URI, true,
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new ContentObserver(new Handler()) {
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public void onChange(boolean selfChange) {
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mReceiver.onReceive(context, (Intent) null);
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}
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});
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// The real work gets done lazily in init() -- that way service creation always
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// succeeds, and things like disk problems cause individual method failures.
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}
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/** Unregisters broadcast receivers and any other hooks -- for test instances */
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public void stop() {
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mContext.unregisterReceiver(mReceiver);
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}
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public void add(DropBoxManager.Entry entry) {
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File temp = null;
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OutputStream output = null;
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final String tag = entry.getTag();
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try {
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int flags = entry.getFlags();
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if ((flags & DropBoxManager.IS_EMPTY) != 0) throw new IllegalArgumentException();
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init();
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if (!isTagEnabled(tag)) return;
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long max = trimToFit();
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long lastTrim = System.currentTimeMillis();
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byte[] buffer = new byte[mBlockSize];
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InputStream input = entry.getInputStream();
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// First, accumulate up to one block worth of data in memory before
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// deciding whether to compress the data or not.
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int read = 0;
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while (read < buffer.length) {
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int n = input.read(buffer, read, buffer.length - read);
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if (n <= 0) break;
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read += n;
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}
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// If we have at least one block, compress it -- otherwise, just write
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// the data in uncompressed form.
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temp = new File(mDropBoxDir, "drop" + Thread.currentThread().getId() + ".tmp");
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int bufferSize = mBlockSize;
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if (bufferSize > 4096) bufferSize = 4096;
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if (bufferSize < 512) bufferSize = 512;
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FileOutputStream foutput = new FileOutputStream(temp);
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output = new BufferedOutputStream(foutput, bufferSize);
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if (read == buffer.length && ((flags & DropBoxManager.IS_GZIPPED) == 0)) {
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output = new GZIPOutputStream(output);
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flags = flags | DropBoxManager.IS_GZIPPED;
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}
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do {
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output.write(buffer, 0, read);
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long now = System.currentTimeMillis();
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if (now - lastTrim > 30 * 1000) {
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max = trimToFit(); // In case data dribbles in slowly
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lastTrim = now;
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}
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read = input.read(buffer);
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if (read <= 0) {
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FileUtils.sync(foutput);
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output.close(); // Get a final size measurement
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output = null;
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} else {
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output.flush(); // So the size measurement is pseudo-reasonable
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}
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long len = temp.length();
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if (len > max) {
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Slog.w(TAG, "Dropping: " + tag + " (" + temp.length() + " > " + max + " bytes)");
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temp.delete();
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temp = null; // Pass temp = null to createEntry() to leave a tombstone
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break;
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}
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} while (read > 0);
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createEntry(temp, tag, flags);
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temp = null;
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} catch (IOException e) {
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Slog.e(TAG, "Can't write: " + tag, e);
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} finally {
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try { if (output != null) output.close(); } catch (IOException e) {}
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entry.close();
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if (temp != null) temp.delete();
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}
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}
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public boolean isTagEnabled(String tag) {
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return !"disabled".equals(Settings.Secure.getString(
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mContentResolver, Settings.Secure.DROPBOX_TAG_PREFIX + tag));
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}
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public synchronized DropBoxManager.Entry getNextEntry(String tag, long millis) {
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if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.READ_LOGS)
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!= PackageManager.PERMISSION_GRANTED) {
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throw new SecurityException("READ_LOGS permission required");
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}
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try {
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init();
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} catch (IOException e) {
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Slog.e(TAG, "Can't init", e);
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return null;
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}
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FileList list = tag == null ? mAllFiles : mFilesByTag.get(tag);
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if (list == null) return null;
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for (EntryFile entry : list.contents.tailSet(new EntryFile(millis + 1))) {
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if (entry.tag == null) continue;
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if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) {
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return new DropBoxManager.Entry(entry.tag, entry.timestampMillis);
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}
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try {
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return new DropBoxManager.Entry(
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entry.tag, entry.timestampMillis, entry.file, entry.flags);
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} catch (IOException e) {
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Slog.e(TAG, "Can't read: " + entry.file, e);
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// Continue to next file
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}
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}
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return null;
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}
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public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
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if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
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!= PackageManager.PERMISSION_GRANTED) {
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pw.println("Permission Denial: Can't dump DropBoxManagerService");
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return;
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}
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try {
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init();
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} catch (IOException e) {
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pw.println("Can't initialize: " + e);
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Slog.e(TAG, "Can't init", e);
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return;
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}
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if (PROFILE_DUMP) Debug.startMethodTracing("/data/trace/dropbox.dump");
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StringBuilder out = new StringBuilder();
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boolean doPrint = false, doFile = false;
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ArrayList<String> searchArgs = new ArrayList<String>();
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for (int i = 0; args != null && i < args.length; i++) {
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if (args[i].equals("-p") || args[i].equals("--print")) {
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doPrint = true;
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} else if (args[i].equals("-f") || args[i].equals("--file")) {
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doFile = true;
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} else if (args[i].startsWith("-")) {
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out.append("Unknown argument: ").append(args[i]).append("\n");
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} else {
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searchArgs.add(args[i]);
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}
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}
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out.append("Drop box contents: ").append(mAllFiles.contents.size()).append(" entries\n");
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if (!searchArgs.isEmpty()) {
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out.append("Searching for:");
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for (String a : searchArgs) out.append(" ").append(a);
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out.append("\n");
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}
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int numFound = 0, numArgs = searchArgs.size();
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Time time = new Time();
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out.append("\n");
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for (EntryFile entry : mAllFiles.contents) {
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time.set(entry.timestampMillis);
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String date = time.format("%Y-%m-%d %H:%M:%S");
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boolean match = true;
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for (int i = 0; i < numArgs && match; i++) {
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String arg = searchArgs.get(i);
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match = (date.contains(arg) || arg.equals(entry.tag));
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}
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if (!match) continue;
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numFound++;
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if (doPrint) out.append("========================================\n");
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out.append(date).append(" ").append(entry.tag == null ? "(no tag)" : entry.tag);
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if (entry.file == null) {
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out.append(" (no file)\n");
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continue;
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} else if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) {
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out.append(" (contents lost)\n");
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continue;
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} else {
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out.append(" (");
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if ((entry.flags & DropBoxManager.IS_GZIPPED) != 0) out.append("compressed ");
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out.append((entry.flags & DropBoxManager.IS_TEXT) != 0 ? "text" : "data");
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out.append(", ").append(entry.file.length()).append(" bytes)\n");
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}
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if (doFile || (doPrint && (entry.flags & DropBoxManager.IS_TEXT) == 0)) {
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if (!doPrint) out.append(" ");
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out.append(entry.file.getPath()).append("\n");
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}
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if ((entry.flags & DropBoxManager.IS_TEXT) != 0 && (doPrint || !doFile)) {
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DropBoxManager.Entry dbe = null;
|
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try {
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dbe = new DropBoxManager.Entry(
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entry.tag, entry.timestampMillis, entry.file, entry.flags);
|
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if (doPrint) {
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InputStreamReader r = new InputStreamReader(dbe.getInputStream());
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char[] buf = new char[4096];
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boolean newline = false;
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for (;;) {
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int n = r.read(buf);
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if (n <= 0) break;
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out.append(buf, 0, n);
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newline = (buf[n - 1] == '\n');
|
||
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// Flush periodically when printing to avoid out-of-memory.
|
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if (out.length() > 65536) {
|
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pw.write(out.toString());
|
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out.setLength(0);
|
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}
|
||
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}
|
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if (!newline) out.append("\n");
|
||
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} else {
|
||
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String text = dbe.getText(70);
|
||
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boolean truncated = (text.length() == 70);
|
||
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out.append(" ").append(text.trim().replace('\n', '/'));
|
||
|
|
if (truncated) out.append(" ...");
|
||
|
|
out.append("\n");
|
||
|
|
}
|
||
|
|
} catch (IOException e) {
|
||
|
|
out.append("*** ").append(e.toString()).append("\n");
|
||
|
|
Slog.e(TAG, "Can't read: " + entry.file, e);
|
||
|
|
} finally {
|
||
|
|
if (dbe != null) dbe.close();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (doPrint) out.append("\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
if (numFound == 0) out.append("(No entries found.)\n");
|
||
|
|
|
||
|
|
if (args == null || args.length == 0) {
|
||
|
|
if (!doPrint) out.append("\n");
|
||
|
|
out.append("Usage: dumpsys dropbox [--print|--file] [YYYY-mm-dd] [HH:MM:SS] [tag]\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
pw.write(out.toString());
|
||
|
|
if (PROFILE_DUMP) Debug.stopMethodTracing();
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
/** Chronologically sorted list of {@link #EntryFile} */
|
||
|
|
private static final class FileList implements Comparable<FileList> {
|
||
|
|
public int blocks = 0;
|
||
|
|
public final TreeSet<EntryFile> contents = new TreeSet<EntryFile>();
|
||
|
|
|
||
|
|
/** Sorts bigger FileList instances before smaller ones. */
|
||
|
|
public final int compareTo(FileList o) {
|
||
|
|
if (blocks != o.blocks) return o.blocks - blocks;
|
||
|
|
if (this == o) return 0;
|
||
|
|
if (hashCode() < o.hashCode()) return -1;
|
||
|
|
if (hashCode() > o.hashCode()) return 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Metadata describing an on-disk log file. */
|
||
|
|
private static final class EntryFile implements Comparable<EntryFile> {
|
||
|
|
public final String tag;
|
||
|
|
public final long timestampMillis;
|
||
|
|
public final int flags;
|
||
|
|
public final File file;
|
||
|
|
public final int blocks;
|
||
|
|
|
||
|
|
/** Sorts earlier EntryFile instances before later ones. */
|
||
|
|
public final int compareTo(EntryFile o) {
|
||
|
|
if (timestampMillis < o.timestampMillis) return -1;
|
||
|
|
if (timestampMillis > o.timestampMillis) return 1;
|
||
|
|
if (file != null && o.file != null) return file.compareTo(o.file);
|
||
|
|
if (o.file != null) return -1;
|
||
|
|
if (file != null) return 1;
|
||
|
|
if (this == o) return 0;
|
||
|
|
if (hashCode() < o.hashCode()) return -1;
|
||
|
|
if (hashCode() > o.hashCode()) return 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Moves an existing temporary file to a new log filename.
|
||
|
|
* @param temp file to rename
|
||
|
|
* @param dir to store file in
|
||
|
|
* @param tag to use for new log file name
|
||
|
|
* @param timestampMillis of log entry
|
||
|
|
* @param flags for the entry data
|
||
|
|
* @param blockSize to use for space accounting
|
||
|
|
* @throws IOException if the file can't be moved
|
||
|
|
*/
|
||
|
|
public EntryFile(File temp, File dir, String tag,long timestampMillis,
|
||
|
|
int flags, int blockSize) throws IOException {
|
||
|
|
if ((flags & DropBoxManager.IS_EMPTY) != 0) throw new IllegalArgumentException();
|
||
|
|
|
||
|
|
this.tag = tag;
|
||
|
|
this.timestampMillis = timestampMillis;
|
||
|
|
this.flags = flags;
|
||
|
|
this.file = new File(dir, Uri.encode(tag) + "@" + timestampMillis +
|
||
|
|
((flags & DropBoxManager.IS_TEXT) != 0 ? ".txt" : ".dat") +
|
||
|
|
((flags & DropBoxManager.IS_GZIPPED) != 0 ? ".gz" : ""));
|
||
|
|
|
||
|
|
if (!temp.renameTo(this.file)) {
|
||
|
|
throw new IOException("Can't rename " + temp + " to " + this.file);
|
||
|
|
}
|
||
|
|
this.blocks = (int) ((this.file.length() + blockSize - 1) / blockSize);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a zero-length tombstone for a file whose contents were lost.
|
||
|
|
* @param dir to store file in
|
||
|
|
* @param tag to use for new log file name
|
||
|
|
* @param timestampMillis of log entry
|
||
|
|
* @throws IOException if the file can't be created.
|
||
|
|
*/
|
||
|
|
public EntryFile(File dir, String tag, long timestampMillis) throws IOException {
|
||
|
|
this.tag = tag;
|
||
|
|
this.timestampMillis = timestampMillis;
|
||
|
|
this.flags = DropBoxManager.IS_EMPTY;
|
||
|
|
this.file = new File(dir, Uri.encode(tag) + "@" + timestampMillis + ".lost");
|
||
|
|
this.blocks = 0;
|
||
|
|
new FileOutputStream(this.file).close();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Extracts metadata from an existing on-disk log filename.
|
||
|
|
* @param file name of existing log file
|
||
|
|
* @param blockSize to use for space accounting
|
||
|
|
*/
|
||
|
|
public EntryFile(File file, int blockSize) {
|
||
|
|
this.file = file;
|
||
|
|
this.blocks = (int) ((this.file.length() + blockSize - 1) / blockSize);
|
||
|
|
|
||
|
|
String name = file.getName();
|
||
|
|
int at = name.lastIndexOf('@');
|
||
|
|
if (at < 0) {
|
||
|
|
this.tag = null;
|
||
|
|
this.timestampMillis = 0;
|
||
|
|
this.flags = DropBoxManager.IS_EMPTY;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
int flags = 0;
|
||
|
|
this.tag = Uri.decode(name.substring(0, at));
|
||
|
|
if (name.endsWith(".gz")) {
|
||
|
|
flags |= DropBoxManager.IS_GZIPPED;
|
||
|
|
name = name.substring(0, name.length() - 3);
|
||
|
|
}
|
||
|
|
if (name.endsWith(".lost")) {
|
||
|
|
flags |= DropBoxManager.IS_EMPTY;
|
||
|
|
name = name.substring(at + 1, name.length() - 5);
|
||
|
|
} else if (name.endsWith(".txt")) {
|
||
|
|
flags |= DropBoxManager.IS_TEXT;
|
||
|
|
name = name.substring(at + 1, name.length() - 4);
|
||
|
|
} else if (name.endsWith(".dat")) {
|
||
|
|
name = name.substring(at + 1, name.length() - 4);
|
||
|
|
} else {
|
||
|
|
this.flags = DropBoxManager.IS_EMPTY;
|
||
|
|
this.timestampMillis = 0;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
this.flags = flags;
|
||
|
|
|
||
|
|
long millis;
|
||
|
|
try { millis = Long.valueOf(name); } catch (NumberFormatException e) { millis = 0; }
|
||
|
|
this.timestampMillis = millis;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a EntryFile object with only a timestamp for comparison purposes.
|
||
|
|
* @param timestampMillis to compare with.
|
||
|
|
*/
|
||
|
|
public EntryFile(long millis) {
|
||
|
|
this.tag = null;
|
||
|
|
this.timestampMillis = millis;
|
||
|
|
this.flags = DropBoxManager.IS_EMPTY;
|
||
|
|
this.file = null;
|
||
|
|
this.blocks = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
/** If never run before, scans disk contents to build in-memory tracking data. */
|
||
|
|
private synchronized void init() throws IOException {
|
||
|
|
if (mStatFs == null) {
|
||
|
|
if (!mDropBoxDir.isDirectory() && !mDropBoxDir.mkdirs()) {
|
||
|
|
throw new IOException("Can't mkdir: " + mDropBoxDir);
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
mStatFs = new StatFs(mDropBoxDir.getPath());
|
||
|
|
mBlockSize = mStatFs.getBlockSize();
|
||
|
|
} catch (IllegalArgumentException e) { // StatFs throws this on error
|
||
|
|
throw new IOException("Can't statfs: " + mDropBoxDir);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mAllFiles == null) {
|
||
|
|
File[] files = mDropBoxDir.listFiles();
|
||
|
|
if (files == null) throw new IOException("Can't list files: " + mDropBoxDir);
|
||
|
|
|
||
|
|
mAllFiles = new FileList();
|
||
|
|
mFilesByTag = new HashMap<String, FileList>();
|
||
|
|
|
||
|
|
// Scan pre-existing files.
|
||
|
|
for (File file : files) {
|
||
|
|
if (file.getName().endsWith(".tmp")) {
|
||
|
|
Slog.i(TAG, "Cleaning temp file: " + file);
|
||
|
|
file.delete();
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
EntryFile entry = new EntryFile(file, mBlockSize);
|
||
|
|
if (entry.tag == null) {
|
||
|
|
Slog.w(TAG, "Unrecognized file: " + file);
|
||
|
|
continue;
|
||
|
|
} else if (entry.timestampMillis == 0) {
|
||
|
|
Slog.w(TAG, "Invalid filename: " + file);
|
||
|
|
file.delete();
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
enrollEntry(entry);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Adds a disk log file to in-memory tracking for accounting and enumeration. */
|
||
|
|
private synchronized void enrollEntry(EntryFile entry) {
|
||
|
|
mAllFiles.contents.add(entry);
|
||
|
|
mAllFiles.blocks += entry.blocks;
|
||
|
|
|
||
|
|
// mFilesByTag is used for trimming, so don't list empty files.
|
||
|
|
// (Zero-length/lost files are trimmed by date from mAllFiles.)
|
||
|
|
|
||
|
|
if (entry.tag != null && entry.file != null && entry.blocks > 0) {
|
||
|
|
FileList tagFiles = mFilesByTag.get(entry.tag);
|
||
|
|
if (tagFiles == null) {
|
||
|
|
tagFiles = new FileList();
|
||
|
|
mFilesByTag.put(entry.tag, tagFiles);
|
||
|
|
}
|
||
|
|
tagFiles.contents.add(entry);
|
||
|
|
tagFiles.blocks += entry.blocks;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Moves a temporary file to a final log filename and enrolls it. */
|
||
|
|
private synchronized void createEntry(File temp, String tag, int flags) throws IOException {
|
||
|
|
long t = System.currentTimeMillis();
|
||
|
|
|
||
|
|
// Require each entry to have a unique timestamp; if there are entries
|
||
|
|
// >10sec in the future (due to clock skew), drag them back to avoid
|
||
|
|
// keeping them around forever.
|
||
|
|
|
||
|
|
SortedSet<EntryFile> tail = mAllFiles.contents.tailSet(new EntryFile(t + 10000));
|
||
|
|
EntryFile[] future = null;
|
||
|
|
if (!tail.isEmpty()) {
|
||
|
|
future = tail.toArray(new EntryFile[tail.size()]);
|
||
|
|
tail.clear(); // Remove from mAllFiles
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!mAllFiles.contents.isEmpty()) {
|
||
|
|
t = Math.max(t, mAllFiles.contents.last().timestampMillis + 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (future != null) {
|
||
|
|
for (EntryFile late : future) {
|
||
|
|
mAllFiles.blocks -= late.blocks;
|
||
|
|
FileList tagFiles = mFilesByTag.get(late.tag);
|
||
|
|
if (tagFiles != null && tagFiles.contents.remove(late)) {
|
||
|
|
tagFiles.blocks -= late.blocks;
|
||
|
|
}
|
||
|
|
if ((late.flags & DropBoxManager.IS_EMPTY) == 0) {
|
||
|
|
enrollEntry(new EntryFile(
|
||
|
|
late.file, mDropBoxDir, late.tag, t++, late.flags, mBlockSize));
|
||
|
|
} else {
|
||
|
|
enrollEntry(new EntryFile(mDropBoxDir, late.tag, t++));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (temp == null) {
|
||
|
|
enrollEntry(new EntryFile(mDropBoxDir, tag, t));
|
||
|
|
} else {
|
||
|
|
enrollEntry(new EntryFile(temp, mDropBoxDir, tag, t, flags, mBlockSize));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Trims the files on disk to make sure they aren't using too much space.
|
||
|
|
* @return the overall quota for storage (in bytes)
|
||
|
|
*/
|
||
|
|
private synchronized long trimToFit() {
|
||
|
|
// Expunge aged items (including tombstones marking deleted data).
|
||
|
|
|
||
|
|
int ageSeconds = Settings.Secure.getInt(mContentResolver,
|
||
|
|
Settings.Secure.DROPBOX_AGE_SECONDS, DEFAULT_AGE_SECONDS);
|
||
|
|
int maxFiles = Settings.Secure.getInt(mContentResolver,
|
||
|
|
Settings.Secure.DROPBOX_MAX_FILES, DEFAULT_MAX_FILES);
|
||
|
|
long cutoffMillis = System.currentTimeMillis() - ageSeconds * 1000;
|
||
|
|
while (!mAllFiles.contents.isEmpty()) {
|
||
|
|
EntryFile entry = mAllFiles.contents.first();
|
||
|
|
if (entry.timestampMillis > cutoffMillis && mAllFiles.contents.size() < maxFiles) break;
|
||
|
|
|
||
|
|
FileList tag = mFilesByTag.get(entry.tag);
|
||
|
|
if (tag != null && tag.contents.remove(entry)) tag.blocks -= entry.blocks;
|
||
|
|
if (mAllFiles.contents.remove(entry)) mAllFiles.blocks -= entry.blocks;
|
||
|
|
if (entry.file != null) entry.file.delete();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Compute overall quota (a fraction of available free space) in blocks.
|
||
|
|
// The quota changes dynamically based on the amount of free space;
|
||
|
|
// that way when lots of data is available we can use it, but we'll get
|
||
|
|
// out of the way if storage starts getting tight.
|
||
|
|
|
||
|
|
long uptimeMillis = SystemClock.uptimeMillis();
|
||
|
|
if (uptimeMillis > mCachedQuotaUptimeMillis + QUOTA_RESCAN_MILLIS) {
|
||
|
|
int quotaPercent = Settings.Secure.getInt(mContentResolver,
|
||
|
|
Settings.Secure.DROPBOX_QUOTA_PERCENT, DEFAULT_QUOTA_PERCENT);
|
||
|
|
int reservePercent = Settings.Secure.getInt(mContentResolver,
|
||
|
|
Settings.Secure.DROPBOX_RESERVE_PERCENT, DEFAULT_RESERVE_PERCENT);
|
||
|
|
int quotaKb = Settings.Secure.getInt(mContentResolver,
|
||
|
|
Settings.Secure.DROPBOX_QUOTA_KB, DEFAULT_QUOTA_KB);
|
||
|
|
|
||
|
|
mStatFs.restat(mDropBoxDir.getPath());
|
||
|
|
int available = mStatFs.getAvailableBlocks();
|
||
|
|
int nonreserved = available - mStatFs.getBlockCount() * reservePercent / 100;
|
||
|
|
int maximum = quotaKb * 1024 / mBlockSize;
|
||
|
|
mCachedQuotaBlocks = Math.min(maximum, Math.max(0, nonreserved * quotaPercent / 100));
|
||
|
|
mCachedQuotaUptimeMillis = uptimeMillis;
|
||
|
|
}
|
||
|
|
|
||
|
|
// If we're using too much space, delete old items to make room.
|
||
|
|
//
|
||
|
|
// We trim each tag independently (this is why we keep per-tag lists).
|
||
|
|
// Space is "fairly" shared between tags -- they are all squeezed
|
||
|
|
// equally until enough space is reclaimed.
|
||
|
|
//
|
||
|
|
// A single circular buffer (a la logcat) would be simpler, but this
|
||
|
|
// way we can handle fat/bursty data (like 1MB+ bugreports, 300KB+
|
||
|
|
// kernel crash dumps, and 100KB+ ANR reports) without swamping small,
|
||
|
|
// well-behaved data streams (event statistics, profile data, etc).
|
||
|
|
//
|
||
|
|
// Deleted files are replaced with zero-length tombstones to mark what
|
||
|
|
// was lost. Tombstones are expunged by age (see above).
|
||
|
|
|
||
|
|
if (mAllFiles.blocks > mCachedQuotaBlocks) {
|
||
|
|
// Find a fair share amount of space to limit each tag
|
||
|
|
int unsqueezed = mAllFiles.blocks, squeezed = 0;
|
||
|
|
TreeSet<FileList> tags = new TreeSet<FileList>(mFilesByTag.values());
|
||
|
|
for (FileList tag : tags) {
|
||
|
|
if (squeezed > 0 && tag.blocks <= (mCachedQuotaBlocks - unsqueezed) / squeezed) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
unsqueezed -= tag.blocks;
|
||
|
|
squeezed++;
|
||
|
|
}
|
||
|
|
int tagQuota = (mCachedQuotaBlocks - unsqueezed) / squeezed;
|
||
|
|
|
||
|
|
// Remove old items from each tag until it meets the per-tag quota.
|
||
|
|
for (FileList tag : tags) {
|
||
|
|
if (mAllFiles.blocks < mCachedQuotaBlocks) break;
|
||
|
|
while (tag.blocks > tagQuota && !tag.contents.isEmpty()) {
|
||
|
|
EntryFile entry = tag.contents.first();
|
||
|
|
if (tag.contents.remove(entry)) tag.blocks -= entry.blocks;
|
||
|
|
if (mAllFiles.contents.remove(entry)) mAllFiles.blocks -= entry.blocks;
|
||
|
|
|
||
|
|
try {
|
||
|
|
if (entry.file != null) entry.file.delete();
|
||
|
|
enrollEntry(new EntryFile(mDropBoxDir, entry.tag, entry.timestampMillis));
|
||
|
|
} catch (IOException e) {
|
||
|
|
Slog.e(TAG, "Can't write tombstone file", e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return mCachedQuotaBlocks * mBlockSize;
|
||
|
|
}
|
||
|
|
}
|