| /* |
| * 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.database.ContentObserver; |
| import android.net.Uri; |
| import android.os.Debug; |
| import android.os.DropBoxManager; |
| import android.os.Handler; |
| import android.os.ParcelFileDescriptor; |
| import android.os.StatFs; |
| import android.os.SystemClock; |
| import android.provider.Settings; |
| import android.text.format.Time; |
| import android.util.Slog; |
| |
| import com.android.internal.os.IDropBoxManagerService; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| 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.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 IDropBoxManagerService} using the filesystem. |
| * Clients use {@link DropBoxManager} to access this service. |
| */ |
| public final class DropBoxManagerService extends IDropBoxManagerService.Stub { |
| private static final String TAG = "DropBoxManagerService"; |
| private static final int DEFAULT_AGE_SECONDS = 3 * 86400; |
| private static final int DEFAULT_MAX_FILES = 1000; |
| private static final int DEFAULT_QUOTA_KB = 5 * 1024; |
| private static final int DEFAULT_QUOTA_PERCENT = 10; |
| private static final int DEFAULT_RESERVE_PERCENT = 10; |
| private static final int QUOTA_RESCAN_MILLIS = 5000; |
| |
| private static final boolean PROFILE_DUMP = false; |
| |
| // 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 |
| |
| // Run the initialization in the background (not this main thread). |
| // The init() and trimToFit() methods are synchronized, so they still |
| // block other users -- but at least the onReceive() call can finish. |
| new Thread() { |
| public void run() { |
| try { |
| init(); |
| trimToFit(); |
| } catch (IOException e) { |
| Slog.e(TAG, "Can't init", e); |
| } |
| } |
| }.start(); |
| } |
| }; |
| |
| /** |
| * 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 DropBoxManagerService(final 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)); |
| |
| mContentResolver.registerContentObserver( |
| Settings.Secure.CONTENT_URI, true, |
| new ContentObserver(new Handler()) { |
| public void onChange(boolean selfChange) { |
| mReceiver.onReceive(context, (Intent) null); |
| } |
| }); |
| |
| // 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 add(DropBoxManager.Entry entry) { |
| File temp = null; |
| OutputStream output = null; |
| final String tag = entry.getTag(); |
| try { |
| int flags = entry.getFlags(); |
| if ((flags & DropBoxManager.IS_EMPTY) != 0) throw new IllegalArgumentException(); |
| |
| init(); |
| if (!isTagEnabled(tag)) return; |
| long max = trimToFit(); |
| long lastTrim = System.currentTimeMillis(); |
| |
| byte[] buffer = new byte[mBlockSize]; |
| InputStream input = entry.getInputStream(); |
| |
| // 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 & DropBoxManager.IS_GZIPPED) == 0)) { |
| output = new GZIPOutputStream(output); |
| flags = flags | DropBoxManager.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) { |
| Slog.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) { |
| Slog.e(TAG, "Can't write: " + tag, e); |
| } finally { |
| try { if (output != null) output.close(); } catch (IOException e) {} |
| entry.close(); |
| if (temp != null) temp.delete(); |
| } |
| } |
| |
| public boolean isTagEnabled(String tag) { |
| return !"disabled".equals(Settings.Secure.getString( |
| mContentResolver, Settings.Secure.DROPBOX_TAG_PREFIX + tag)); |
| } |
| |
| public synchronized DropBoxManager.Entry getNextEntry(String tag, 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) { |
| Slog.e(TAG, "Can't init", e); |
| return null; |
| } |
| |
| FileList list = tag == null ? mAllFiles : mFilesByTag.get(tag); |
| if (list == null) return null; |
| |
| for (EntryFile entry : list.contents.tailSet(new EntryFile(millis + 1))) { |
| if (entry.tag == null) continue; |
| if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) { |
| return new DropBoxManager.Entry(entry.tag, entry.timestampMillis); |
| } |
| try { |
| return new DropBoxManager.Entry( |
| entry.tag, entry.timestampMillis, entry.file, entry.flags); |
| } catch (IOException e) { |
| Slog.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 DropBoxManagerService"); |
| return; |
| } |
| |
| try { |
| init(); |
| } catch (IOException e) { |
| pw.println("Can't initialize: " + e); |
| Slog.e(TAG, "Can't init", e); |
| return; |
| } |
| |
| if (PROFILE_DUMP) Debug.startMethodTracing("/data/trace/dropbox.dump"); |
| |
| StringBuilder out = new StringBuilder(); |
| 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("-")) { |
| out.append("Unknown argument: ").append(args[i]).append("\n"); |
| } else { |
| searchArgs.add(args[i]); |
| } |
| } |
| |
| out.append("Drop box contents: ").append(mAllFiles.contents.size()).append(" entries\n"); |
| |
| if (!searchArgs.isEmpty()) { |
| out.append("Searching for:"); |
| for (String a : searchArgs) out.append(" ").append(a); |
| out.append("\n"); |
| } |
| |
| int numFound = 0, numArgs = searchArgs.size(); |
| Time time = new Time(); |
| out.append("\n"); |
| for (EntryFile entry : mAllFiles.contents) { |
| time.set(entry.timestampMillis); |
| String date = time.format("%Y-%m-%d %H:%M:%S"); |
| boolean match = true; |
| for (int i = 0; i < numArgs && match; i++) { |
| String arg = searchArgs.get(i); |
| match = (date.contains(arg) || arg.equals(entry.tag)); |
| } |
| if (!match) continue; |
| |
| numFound++; |
| if (doPrint) out.append("========================================\n"); |
| out.append(date).append(" ").append(entry.tag == null ? "(no tag)" : entry.tag); |
| if (entry.file == null) { |
| out.append(" (no file)\n"); |
| continue; |
| } else if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) { |
| out.append(" (contents lost)\n"); |
| continue; |
| } else { |
| out.append(" ("); |
| if ((entry.flags & DropBoxManager.IS_GZIPPED) != 0) out.append("compressed "); |
| out.append((entry.flags & DropBoxManager.IS_TEXT) != 0 ? "text" : "data"); |
| out.append(", ").append(entry.file.length()).append(" bytes)\n"); |
| } |
| |
| if (doFile || (doPrint && (entry.flags & DropBoxManager.IS_TEXT) == 0)) { |
| if (!doPrint) out.append(" "); |
| out.append(entry.file.getPath()).append("\n"); |
| } |
| |
| if ((entry.flags & DropBoxManager.IS_TEXT) != 0 && (doPrint || !doFile)) { |
| DropBoxManager.Entry dbe = null; |
| try { |
| dbe = new DropBoxManager.Entry( |
| 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; |
| out.append(buf, 0, n); |
| newline = (buf[n - 1] == '\n'); |
| |
| // Flush periodically when printing to avoid out-of-memory. |
| if (out.length() > 65536) { |
| pw.write(out.toString()); |
| out.setLength(0); |
| } |
| } |
| if (!newline) out.append("\n"); |
| } else { |
| String text = dbe.getText(70); |
| boolean truncated = (text.length() == 70); |
| 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) { |
| Slog.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) { |
| Slog.e(TAG, "Can't write tombstone file", e); |
| } |
| } |
| } |
| } |
| |
| return mCachedQuotaBlocks * mBlockSize; |
| } |
| } |