Framework-side DropBox service that maintains a size-bounded
queue of data chunks (sort of a blob-oriented logcat).
In the future, this will be coupled with a revised checkin service that
would actually upload this data.
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;
+ }
+}