diff --git a/services/java/com/android/server/DropBoxService.java b/services/java/com/android/server/DropBoxService.java
new file mode 100644
index 0000000..3a4c3ac
--- /dev/null
+++ b/services/java/com/android/server/DropBoxService.java
@@ -0,0 +1,725 @@
+/*
+ * Copyright (C) 2009 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.BroadcastReceiver;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.os.DropBoxEntry;
+import android.os.IDropBox;
+import android.os.ParcelFileDescriptor;
+import android.os.StatFs;
+import android.os.SystemClock;
+import android.provider.Settings;
+import android.text.format.DateFormat;
+import android.util.Log;
+
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.Formatter;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.SortedSet;
+import java.util.TreeSet;
+import java.util.zip.GZIPOutputStream;
+
+/**
+ * Implementation of {@link IDropBox} using the filesystem.
+ *
+ * {@hide}
+ */
+public final class DropBoxService extends IDropBox.Stub {
+    private static final String TAG = "DropBoxService";
+    private static final int DEFAULT_RESERVE_PERCENT = 10;
+    private static final int DEFAULT_QUOTA_PERCENT = 10;
+    private static final int DEFAULT_QUOTA_KB = 5 * 1024;
+    private static final int DEFAULT_AGE_SECONDS = 3 * 86400;
+    private static final int QUOTA_RESCAN_MILLIS = 5000;
+
+    // TODO: This implementation currently uses one file per entry, which is
+    // inefficient for smallish entries -- consider using a single queue file
+    // per tag (or even globally) instead.
+
+    // The cached context and derived objects
+
+    private final Context mContext;
+    private final ContentResolver mContentResolver;
+    private final File mDropBoxDir;
+
+    // Accounting of all currently written log files (set in init()).
+
+    private FileList mAllFiles = null;
+    private HashMap<String, FileList> mFilesByTag = null;
+
+    // Various bits of disk information
+
+    private StatFs mStatFs = null;
+    private int mBlockSize = 0;
+    private int mCachedQuotaBlocks = 0;  // Space we can use: computed from free space, etc.
+    private long mCachedQuotaUptimeMillis = 0;
+
+    // Ensure that all log entries have a unique timestamp
+    private long mLastTimestamp = 0;
+
+    /** Receives events that might indicate a need to clean up files. */
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            mCachedQuotaUptimeMillis = 0;  // Force a re-check of quota size
+            try {
+                init();
+                trimToFit();
+            } catch (IOException e) {
+                Log.e(TAG, "Can't init", e);
+            }
+        }
+    };
+
+    /**
+     * Creates an instance of managed drop box storage.  Normally there is one of these
+     * run by the system, but others can be created for testing and other purposes.
+     *
+     * @param context to use for receiving free space & gservices intents
+     * @param path to store drop box entries in
+     */
+    public DropBoxService(Context context, File path) {
+        mDropBoxDir = path;
+
+        // Set up intent receivers
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        context.registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW));
+        context.registerReceiver(mReceiver, new IntentFilter(Settings.Gservices.CHANGED_ACTION));
+
+        // The real work gets done lazily in init() -- that way service creation always
+        // succeeds, and things like disk problems cause individual method failures.
+    }
+
+    /** Unregisters broadcast receivers and any other hooks -- for test instances */
+    public void stop() {
+        mContext.unregisterReceiver(mReceiver);
+    }
+
+    public void addText(String tag, String data) {
+        addData(tag, data.getBytes(), DropBoxEntry.IS_TEXT);
+    }
+
+    public void addData(String tag, byte[] data, int flags) {
+        File temp = null;
+        OutputStream out = null;
+        try {
+            if ((flags & DropBoxEntry.IS_EMPTY) != 0) throw new IllegalArgumentException();
+
+            init();
+            if (!isTagEnabled(tag)) return;
+
+            long max = trimToFit();
+            if (data.length > max) {
+                Log.w(TAG, "Dropping: " + tag + " (" + data.length + " > " + max + " bytes)");
+                // Pass temp = null to createEntry() to leave a tombstone
+            } else {
+                temp = new File(mDropBoxDir, "drop" + Thread.currentThread().getId() + ".tmp");
+                out = new FileOutputStream(temp);
+                if (data.length > mBlockSize && ((flags & DropBoxEntry.IS_GZIPPED) == 0)) {
+                    flags = flags | DropBoxEntry.IS_GZIPPED;
+                    out = new GZIPOutputStream(out);
+                }
+                out.write(data);
+                out.close();
+                out = null;
+            }
+
+            createEntry(temp, tag, flags);
+            temp = null;
+        } catch (IOException e) {
+            Log.e(TAG, "Can't write: " + tag, e);
+        } finally {
+            try { if (out != null) out.close(); } catch (IOException e) {}
+            if (temp != null) temp.delete();
+        }
+    }
+
+    public void addFile(String tag, ParcelFileDescriptor data, int flags) {
+        File temp = null;
+        OutputStream output = null;
+        try {
+            if ((flags & DropBoxEntry.IS_EMPTY) != 0) throw new IllegalArgumentException();
+
+            init();
+            if (!isTagEnabled(tag)) return;
+            long max = trimToFit();
+            long lastTrim = System.currentTimeMillis();
+
+            byte[] buffer = new byte[mBlockSize];
+            FileInputStream input = new FileInputStream(data.getFileDescriptor());
+
+            // First, accumulate up to one block worth of data in memory before
+            // deciding whether to compress the data or not.
+
+            int read = 0;
+            while (read < buffer.length) {
+                int n = input.read(buffer, read, buffer.length - read);
+                if (n <= 0) break;
+                read += n;
+            }
+
+            // If we have at least one block, compress it -- otherwise, just write
+            // the data in uncompressed form.
+
+            temp = new File(mDropBoxDir, "drop" + Thread.currentThread().getId() + ".tmp");
+            output = new FileOutputStream(temp);
+            if (read == buffer.length && ((flags & DropBoxEntry.IS_GZIPPED) == 0)) {
+                output = new GZIPOutputStream(output);
+                flags = flags | DropBoxEntry.IS_GZIPPED;
+            }
+
+            do {
+                output.write(buffer, 0, read);
+
+                long now = System.currentTimeMillis();
+                if (now - lastTrim > 30 * 1000) {
+                    max = trimToFit();  // In case data dribbles in slowly
+                    lastTrim = now;
+                }
+
+                read = input.read(buffer);
+                if (read <= 0) {
+                    output.close();  // Get a final size measurement
+                    output = null;
+                } else {
+                    output.flush();  // So the size measurement is pseudo-reasonable
+                }
+
+                long len = temp.length();
+                if (len > max) {
+                    Log.w(TAG, "Dropping: " + tag + " (" + temp.length() + " > " + max + " bytes)");
+                    temp.delete();
+                    temp = null;  // Pass temp = null to createEntry() to leave a tombstone
+                    break;
+                }
+            } while (read > 0);
+
+            createEntry(temp, tag, flags);
+            temp = null;
+        } catch (IOException e) {
+            Log.e(TAG, "Can't write: " + tag, e);
+        } finally {
+            try { if (output != null) output.close(); } catch (IOException e) {}
+            try { data.close(); } catch (IOException e) {}
+            if (temp != null) temp.delete();
+        }
+    }
+
+    public boolean isTagEnabled(String tag) {
+        return !"disabled".equals(Settings.Gservices.getString(
+                mContentResolver, Settings.Gservices.DROPBOX_TAG_PREFIX + tag));
+    }
+
+    public synchronized DropBoxEntry getNextEntry(long millis) {
+        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.READ_LOGS)
+                != PackageManager.PERMISSION_GRANTED) {
+            throw new SecurityException("READ_LOGS permission required");
+        }
+
+        try {
+            init();
+        } catch (IOException e) {
+            Log.e(TAG, "Can't init", e);
+            return null;
+        }
+
+        for (EntryFile entry : mAllFiles.contents.tailSet(new EntryFile(millis + 1))) {
+            if (entry.tag == null) continue;
+            try {
+                File file = (entry.flags & DropBoxEntry.IS_EMPTY) != 0 ? null : entry.file;
+                return new DropBoxEntry(entry.tag, entry.timestampMillis, file, entry.flags);
+            } catch (IOException e) {
+                Log.e(TAG, "Can't read: " + entry.file, e);
+                // Continue to next file
+            }
+        }
+
+        return null;
+    }
+
+    public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
+                != PackageManager.PERMISSION_GRANTED) {
+            pw.println("Permission Denial: Can't dump DropBoxService");
+            return;
+        }
+
+        try {
+            init();
+        } catch (IOException e) {
+            pw.println("Can't initialize: " + e);
+            Log.e(TAG, "Can't init", e);
+            return;
+        }
+
+        boolean doPrint = false, doFile = false;
+        ArrayList<String> searchArgs = new ArrayList<String>();
+        for (int i = 0; args != null && i < args.length; i++) {
+            if (args[i].equals("-p") || args[i].equals("--print")) {
+                doPrint = true;
+            } else if (args[i].equals("-f") || args[i].equals("--file")) {
+                doFile = true;
+            } else if (args[i].startsWith("-")) {
+                pw.print("Unknown argument: ");
+                pw.println(args[i]);
+            } else {
+                searchArgs.add(args[i]);
+            }
+        }
+
+        pw.format("Drop box contents: %d entries", mAllFiles.contents.size());
+        pw.println();
+
+        if (!searchArgs.isEmpty()) {
+            pw.print("Searching for:");
+            for (String a : searchArgs) pw.format(" %s", a);
+            pw.println();
+        }
+
+        int numFound = 0;
+        pw.println();
+        for (EntryFile entry : mAllFiles.contents) {
+            String date = new Formatter().format("%s.%03d",
+                    DateFormat.format("yyyy-MM-dd kk:mm:ss", entry.timestampMillis),
+                    entry.timestampMillis % 1000).toString();
+
+            boolean match = true;
+            for (String a: searchArgs) match = match && (date.contains(a) || a.equals(entry.tag));
+            if (!match) continue;
+
+            numFound++;
+            pw.print(date);
+            pw.print(" ");
+            pw.print(entry.tag == null ? "(no tag)" : entry.tag);
+            if (entry.file == null) {
+                pw.println(" (no file)");
+                continue;
+            } else if ((entry.flags & DropBoxEntry.IS_EMPTY) != 0) {
+                pw.println(" (contents lost)");
+                continue;
+            } else {
+                pw.print((entry.flags & DropBoxEntry.IS_GZIPPED) != 0 ? " (comopressed " : " (");
+                pw.print((entry.flags & DropBoxEntry.IS_TEXT) != 0 ? "text" : "data");
+                pw.format(", %d bytes)", entry.file.length());
+                pw.println();
+            }
+
+            if (doFile || (doPrint && (entry.flags & DropBoxEntry.IS_TEXT) == 0)) {
+                if (!doPrint) pw.print("    ");
+                pw.println(entry.file.getPath());
+            }
+
+            if ((entry.flags & DropBoxEntry.IS_TEXT) != 0 && (doPrint || !doFile)) {
+                DropBoxEntry dbe = null;
+                try {
+                    dbe = new DropBoxEntry(
+                             entry.tag, entry.timestampMillis, entry.file, entry.flags);
+
+                    if (doPrint) {
+                        InputStreamReader r = new InputStreamReader(dbe.getInputStream());
+                        char[] buf = new char[4096];
+                        boolean newline = false;
+                        for (;;) {
+                            int n = r.read(buf);
+                            if (n <= 0) break;
+                            pw.write(buf, 0, n);
+                            newline = (buf[n - 1] == '\n');
+                        }
+                        if (!newline) pw.println();
+                    } else {
+                        String text = dbe.getText(70);
+                        boolean truncated = (text.length() == 70);
+                        pw.print("    ");
+                        pw.print(text.trim().replace('\n', '/'));
+                        if (truncated) pw.print(" ...");
+                        pw.println();
+                    }
+                } catch (IOException e) {
+                    pw.print("*** ");
+                    pw.println(e.toString());
+                    Log.e(TAG, "Can't read: " + entry.file, e);
+                } finally {
+                    if (dbe != null) dbe.close();
+                }
+            }
+
+            if (doPrint) pw.println();
+        }
+
+        if (numFound == 0) pw.println("(No entries found.)");
+
+        if (args == null || args.length == 0) {
+            if (!doPrint) pw.println();
+            pw.println("Usage: dumpsys dropbox [--print|--file] [YYYY-mm-dd] [HH:MM:SS.SSS] [tag]");
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+
+    /** 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 (from {@link DropBoxEntry})
+         * @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 & DropBoxEntry.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 & DropBoxEntry.IS_TEXT) != 0 ? ".txt" : ".dat") +
+                    ((flags & DropBoxEntry.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 = DropBoxEntry.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 = DropBoxEntry.IS_EMPTY;
+                return;
+            }
+
+            int flags = 0;
+            this.tag = Uri.decode(name.substring(0, at));
+            if (name.endsWith(".gz")) {
+                flags |= DropBoxEntry.IS_GZIPPED;
+                name = name.substring(0, name.length() - 3);
+            }
+            if (name.endsWith(".lost")) {
+                flags |= DropBoxEntry.IS_EMPTY;
+                name = name.substring(at + 1, name.length() - 5);
+            } else if (name.endsWith(".txt")) {
+                flags |= DropBoxEntry.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 = DropBoxEntry.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 = DropBoxEntry.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")) {
+                    Log.i(TAG, "Cleaning temp file: " + file);
+                    file.delete();
+                    continue;
+                }
+
+                EntryFile entry = new EntryFile(file, mBlockSize);
+                if (entry.tag == null) {
+                    Log.w(TAG, "Unrecognized file: " + file);
+                    continue;
+                } else if (entry.timestampMillis == 0) {
+                    Log.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.contents.remove(late)) tagFiles.blocks -= late.blocks;
+                if ((late.flags & DropBoxEntry.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.Gservices.getInt(mContentResolver,
+                Settings.Gservices.DROPBOX_AGE_SECONDS, DEFAULT_AGE_SECONDS);
+        long cutoffMillis = System.currentTimeMillis() - ageSeconds * 1000;
+        while (!mAllFiles.contents.isEmpty()) {
+            EntryFile entry = mAllFiles.contents.first();
+            if (entry.timestampMillis > cutoffMillis) 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.Gservices.getInt(mContentResolver,
+                    Settings.Gservices.DROPBOX_QUOTA_PERCENT, DEFAULT_QUOTA_PERCENT);
+            int reservePercent = Settings.Gservices.getInt(mContentResolver,
+                    Settings.Gservices.DROPBOX_RESERVE_PERCENT, DEFAULT_RESERVE_PERCENT);
+            int quotaKb = Settings.Gservices.getInt(mContentResolver,
+                    Settings.Gservices.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) {
+            Log.i(TAG, "Usage (" + mAllFiles.blocks + ") > Quota (" + 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) {
+                        Log.e(TAG, "Can't write tombstone file", e);
+                    }
+                }
+            }
+        }
+
+        return mCachedQuotaBlocks * mBlockSize;
+    }
+}