diff options
Diffstat (limited to 'services/java/com/android/server/DropBoxManagerService.java')
| -rw-r--r-- | services/java/com/android/server/DropBoxManagerService.java | 781 |
1 files changed, 0 insertions, 781 deletions
diff --git a/services/java/com/android/server/DropBoxManagerService.java b/services/java/com/android/server/DropBoxManagerService.java deleted file mode 100644 index 29b04da..0000000 --- a/services/java/com/android/server/DropBoxManagerService.java +++ /dev/null @@ -1,781 +0,0 @@ -/* - * 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.Binder; -import android.os.Debug; -import android.os.DropBoxManager; -import android.os.FileUtils; -import android.os.Handler; -import android.os.Message; -import android.os.StatFs; -import android.os.SystemClock; -import android.os.UserHandle; -import android.provider.Settings; -import android.text.format.Time; -import android.util.Slog; - -import com.android.internal.os.IDropBoxManagerService; - -import java.io.BufferedOutputStream; -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.PrintWriter; -import java.util.ArrayList; -import java.util.HashMap; -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; - - // mHandler 'what' value. - private static final int MSG_SEND_BROADCAST = 1; - - 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; - - private volatile boolean mBooted = false; - - // Provide a way to perform sendBroadcast asynchronously to avoid deadlocks. - private final Handler mHandler; - - /** 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) { - if (intent != null && Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) { - mBooted = true; - return; - } - - // Else, for ACTION_DEVICE_STORAGE_LOW: - 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(); - - IntentFilter filter = new IntentFilter(); - filter.addAction(Intent.ACTION_DEVICE_STORAGE_LOW); - filter.addAction(Intent.ACTION_BOOT_COMPLETED); - context.registerReceiver(mReceiver, filter); - - mContentResolver.registerContentObserver( - Settings.Global.CONTENT_URI, true, - new ContentObserver(new Handler()) { - @Override - public void onChange(boolean selfChange) { - mReceiver.onReceive(context, (Intent) null); - } - }); - - mHandler = new Handler() { - @Override - public void handleMessage(Message msg) { - if (msg.what == MSG_SEND_BROADCAST) { - mContext.sendBroadcastAsUser((Intent)msg.obj, UserHandle.OWNER, - android.Manifest.permission.READ_LOGS); - } - } - }; - - // 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); - } - - @Override - 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"); - int bufferSize = mBlockSize; - if (bufferSize > 4096) bufferSize = 4096; - if (bufferSize < 512) bufferSize = 512; - FileOutputStream foutput = new FileOutputStream(temp); - output = new BufferedOutputStream(foutput, bufferSize); - 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) { - FileUtils.sync(foutput); - 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); - - long time = createEntry(temp, tag, flags); - temp = null; - - final Intent dropboxIntent = new Intent(DropBoxManager.ACTION_DROPBOX_ENTRY_ADDED); - dropboxIntent.putExtra(DropBoxManager.EXTRA_TAG, tag); - dropboxIntent.putExtra(DropBoxManager.EXTRA_TIME, time); - if (!mBooted) { - dropboxIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); - } - // Call sendBroadcast after returning from this call to avoid deadlock. In particular - // the caller may be holding the WindowManagerService lock but sendBroadcast requires a - // lock in ActivityManagerService. ActivityManagerService has been caught holding that - // very lock while waiting for the WindowManagerService lock. - mHandler.sendMessage(mHandler.obtainMessage(MSG_SEND_BROADCAST, dropboxIntent)); - } 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) { - final long token = Binder.clearCallingIdentity(); - try { - return !"disabled".equals(Settings.Global.getString( - mContentResolver, Settings.Global.DROPBOX_TAG_PREFIX + tag)); - } finally { - Binder.restoreCallingIdentity(token); - } - } - - 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; - InputStreamReader isr = null; - try { - dbe = new DropBoxManager.Entry( - entry.tag, entry.timestampMillis, entry.file, entry.flags); - - if (doPrint) { - isr = new InputStreamReader(dbe.getInputStream()); - char[] buf = new char[4096]; - boolean newline = false; - for (;;) { - int n = isr.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 (isr != null) { - try { - isr.close(); - } catch (IOException unused) { - } - } - } - } - - 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 long 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)); - } - return t; - } - - /** - * 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.Global.getInt(mContentResolver, - Settings.Global.DROPBOX_AGE_SECONDS, DEFAULT_AGE_SECONDS); - int maxFiles = Settings.Global.getInt(mContentResolver, - Settings.Global.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.Global.getInt(mContentResolver, - Settings.Global.DROPBOX_QUOTA_PERCENT, DEFAULT_QUOTA_PERCENT); - int reservePercent = Settings.Global.getInt(mContentResolver, - Settings.Global.DROPBOX_RESERVE_PERCENT, DEFAULT_RESERVE_PERCENT); - int quotaKb = Settings.Global.getInt(mContentResolver, - Settings.Global.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; - } -} |