1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server; 18 19 import android.content.BroadcastReceiver; 20 import android.content.ContentResolver; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.content.IntentFilter; 24 import android.content.pm.PackageManager; 25 import android.database.ContentObserver; 26 import android.net.Uri; 27 import android.os.Binder; 28 import android.os.Debug; 29 import android.os.DropBoxManager; 30 import android.os.FileUtils; 31 import android.os.Handler; 32 import android.os.Message; 33 import android.os.StatFs; 34 import android.os.SystemClock; 35 import android.os.UserHandle; 36 import android.provider.Settings; 37 import android.text.format.Time; 38 import android.util.Slog; 39 40 import libcore.io.IoUtils; 41 42 import com.android.internal.os.IDropBoxManagerService; 43 import com.android.internal.util.DumpUtils; 44 45 import java.io.BufferedOutputStream; 46 import java.io.File; 47 import java.io.FileDescriptor; 48 import java.io.FileOutputStream; 49 import java.io.IOException; 50 import java.io.InputStream; 51 import java.io.InputStreamReader; 52 import java.io.OutputStream; 53 import java.io.PrintWriter; 54 import java.util.ArrayList; 55 import java.util.HashMap; 56 import java.util.SortedSet; 57 import java.util.TreeSet; 58 import java.util.zip.GZIPOutputStream; 59 60 /** 61 * Implementation of {@link IDropBoxManagerService} using the filesystem. 62 * Clients use {@link DropBoxManager} to access this service. 63 */ 64 public final class DropBoxManagerService extends SystemService { 65 private static final String TAG = "DropBoxManagerService"; 66 private static final int DEFAULT_AGE_SECONDS = 3 * 86400; 67 private static final int DEFAULT_MAX_FILES = 1000; 68 private static final int DEFAULT_QUOTA_KB = 5 * 1024; 69 private static final int DEFAULT_QUOTA_PERCENT = 10; 70 private static final int DEFAULT_RESERVE_PERCENT = 10; 71 private static final int QUOTA_RESCAN_MILLIS = 5000; 72 73 // mHandler 'what' value. 74 private static final int MSG_SEND_BROADCAST = 1; 75 76 private static final boolean PROFILE_DUMP = false; 77 78 // TODO: This implementation currently uses one file per entry, which is 79 // inefficient for smallish entries -- consider using a single queue file 80 // per tag (or even globally) instead. 81 82 // The cached context and derived objects 83 84 private final ContentResolver mContentResolver; 85 private final File mDropBoxDir; 86 87 // Accounting of all currently written log files (set in init()). 88 89 private FileList mAllFiles = null; 90 private HashMap<String, FileList> mFilesByTag = null; 91 92 // Various bits of disk information 93 94 private StatFs mStatFs = null; 95 private int mBlockSize = 0; 96 private int mCachedQuotaBlocks = 0; // Space we can use: computed from free space, etc. 97 private long mCachedQuotaUptimeMillis = 0; 98 99 private volatile boolean mBooted = false; 100 101 // Provide a way to perform sendBroadcast asynchronously to avoid deadlocks. 102 private final Handler mHandler; 103 104 /** Receives events that might indicate a need to clean up files. */ 105 private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 106 @Override 107 public void onReceive(Context context, Intent intent) { 108 // For ACTION_DEVICE_STORAGE_LOW: 109 mCachedQuotaUptimeMillis = 0; // Force a re-check of quota size 110 111 // Run the initialization in the background (not this main thread). 112 // The init() and trimToFit() methods are synchronized, so they still 113 // block other users -- but at least the onReceive() call can finish. 114 new Thread() { 115 public void run() { 116 try { 117 init(); 118 trimToFit(); 119 } catch (IOException e) { 120 Slog.e(TAG, "Can't init", e); 121 } 122 } 123 }.start(); 124 } 125 }; 126 127 private final IDropBoxManagerService.Stub mStub = new IDropBoxManagerService.Stub() { 128 @Override 129 public void add(DropBoxManager.Entry entry) { 130 DropBoxManagerService.this.add(entry); 131 } 132 133 @Override 134 public boolean isTagEnabled(String tag) { 135 return DropBoxManagerService.this.isTagEnabled(tag); 136 } 137 138 @Override 139 public DropBoxManager.Entry getNextEntry(String tag, long millis) { 140 return DropBoxManagerService.this.getNextEntry(tag, millis); 141 } 142 143 @Override 144 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 145 DropBoxManagerService.this.dump(fd, pw, args); 146 } 147 }; 148 149 /** 150 * Creates an instance of managed drop box storage using the default dropbox 151 * directory. 152 * 153 * @param context to use for receiving free space & gservices intents 154 */ 155 public DropBoxManagerService(final Context context) { 156 this(context, new File("/data/system/dropbox")); 157 } 158 159 /** 160 * Creates an instance of managed drop box storage. Normally there is one of these 161 * run by the system, but others can be created for testing and other purposes. 162 * 163 * @param context to use for receiving free space & gservices intents 164 * @param path to store drop box entries in 165 */ 166 public DropBoxManagerService(final Context context, File path) { 167 super(context); 168 mDropBoxDir = path; 169 mContentResolver = getContext().getContentResolver(); 170 mHandler = new Handler() { 171 @Override 172 public void handleMessage(Message msg) { 173 if (msg.what == MSG_SEND_BROADCAST) { 174 getContext().sendBroadcastAsUser((Intent)msg.obj, UserHandle.SYSTEM, 175 android.Manifest.permission.READ_LOGS); 176 } 177 } 178 }; 179 } 180 181 @Override 182 public void onStart() { 183 publishBinderService(Context.DROPBOX_SERVICE, mStub); 184 185 // The real work gets done lazily in init() -- that way service creation always 186 // succeeds, and things like disk problems cause individual method failures. 187 } 188 189 @Override 190 public void onBootPhase(int phase) { 191 switch (phase) { 192 case PHASE_SYSTEM_SERVICES_READY: 193 IntentFilter filter = new IntentFilter(); 194 filter.addAction(Intent.ACTION_DEVICE_STORAGE_LOW); 195 getContext().registerReceiver(mReceiver, filter); 196 197 mContentResolver.registerContentObserver( 198 Settings.Global.CONTENT_URI, true, 199 new ContentObserver(new Handler()) { 200 @Override 201 public void onChange(boolean selfChange) { 202 mReceiver.onReceive(getContext(), (Intent) null); 203 } 204 }); 205 break; 206 207 case PHASE_BOOT_COMPLETED: 208 mBooted = true; 209 break; 210 } 211 } 212 213 /** Retrieves the binder stub -- for test instances */ 214 public IDropBoxManagerService getServiceStub() { 215 return mStub; 216 } 217 218 public void add(DropBoxManager.Entry entry) { 219 File temp = null; 220 InputStream input = null; 221 OutputStream output = null; 222 final String tag = entry.getTag(); 223 try { 224 int flags = entry.getFlags(); 225 if ((flags & DropBoxManager.IS_EMPTY) != 0) throw new IllegalArgumentException(); 226 227 init(); 228 if (!isTagEnabled(tag)) return; 229 long max = trimToFit(); 230 long lastTrim = System.currentTimeMillis(); 231 232 byte[] buffer = new byte[mBlockSize]; 233 input = entry.getInputStream(); 234 235 // First, accumulate up to one block worth of data in memory before 236 // deciding whether to compress the data or not. 237 238 int read = 0; 239 while (read < buffer.length) { 240 int n = input.read(buffer, read, buffer.length - read); 241 if (n <= 0) break; 242 read += n; 243 } 244 245 // If we have at least one block, compress it -- otherwise, just write 246 // the data in uncompressed form. 247 248 temp = new File(mDropBoxDir, "drop" + Thread.currentThread().getId() + ".tmp"); 249 int bufferSize = mBlockSize; 250 if (bufferSize > 4096) bufferSize = 4096; 251 if (bufferSize < 512) bufferSize = 512; 252 FileOutputStream foutput = new FileOutputStream(temp); 253 output = new BufferedOutputStream(foutput, bufferSize); 254 if (read == buffer.length && ((flags & DropBoxManager.IS_GZIPPED) == 0)) { 255 output = new GZIPOutputStream(output); 256 flags = flags | DropBoxManager.IS_GZIPPED; 257 } 258 259 do { 260 output.write(buffer, 0, read); 261 262 long now = System.currentTimeMillis(); 263 if (now - lastTrim > 30 * 1000) { 264 max = trimToFit(); // In case data dribbles in slowly 265 lastTrim = now; 266 } 267 268 read = input.read(buffer); 269 if (read <= 0) { 270 FileUtils.sync(foutput); 271 output.close(); // Get a final size measurement 272 output = null; 273 } else { 274 output.flush(); // So the size measurement is pseudo-reasonable 275 } 276 277 long len = temp.length(); 278 if (len > max) { 279 Slog.w(TAG, "Dropping: " + tag + " (" + temp.length() + " > " + max + " bytes)"); 280 temp.delete(); 281 temp = null; // Pass temp = null to createEntry() to leave a tombstone 282 break; 283 } 284 } while (read > 0); 285 286 long time = createEntry(temp, tag, flags); 287 temp = null; 288 289 final Intent dropboxIntent = new Intent(DropBoxManager.ACTION_DROPBOX_ENTRY_ADDED); 290 dropboxIntent.putExtra(DropBoxManager.EXTRA_TAG, tag); 291 dropboxIntent.putExtra(DropBoxManager.EXTRA_TIME, time); 292 if (!mBooted) { 293 dropboxIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 294 } 295 // Call sendBroadcast after returning from this call to avoid deadlock. In particular 296 // the caller may be holding the WindowManagerService lock but sendBroadcast requires a 297 // lock in ActivityManagerService. ActivityManagerService has been caught holding that 298 // very lock while waiting for the WindowManagerService lock. 299 mHandler.sendMessage(mHandler.obtainMessage(MSG_SEND_BROADCAST, dropboxIntent)); 300 } catch (IOException e) { 301 Slog.e(TAG, "Can't write: " + tag, e); 302 } finally { 303 IoUtils.closeQuietly(output); 304 IoUtils.closeQuietly(input); 305 entry.close(); 306 if (temp != null) temp.delete(); 307 } 308 } 309 310 public boolean isTagEnabled(String tag) { 311 final long token = Binder.clearCallingIdentity(); 312 try { 313 return !"disabled".equals(Settings.Global.getString( 314 mContentResolver, Settings.Global.DROPBOX_TAG_PREFIX + tag)); 315 } finally { 316 Binder.restoreCallingIdentity(token); 317 } 318 } 319 320 public synchronized DropBoxManager.Entry getNextEntry(String tag, long millis) { 321 if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.READ_LOGS) 322 != PackageManager.PERMISSION_GRANTED) { 323 throw new SecurityException("READ_LOGS permission required"); 324 } 325 326 try { 327 init(); 328 } catch (IOException e) { 329 Slog.e(TAG, "Can't init", e); 330 return null; 331 } 332 333 FileList list = tag == null ? mAllFiles : mFilesByTag.get(tag); 334 if (list == null) return null; 335 336 for (EntryFile entry : list.contents.tailSet(new EntryFile(millis + 1))) { 337 if (entry.tag == null) continue; 338 if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) { 339 return new DropBoxManager.Entry(entry.tag, entry.timestampMillis); 340 } 341 try { 342 return new DropBoxManager.Entry( 343 entry.tag, entry.timestampMillis, entry.file, entry.flags); 344 } catch (IOException e) { 345 Slog.e(TAG, "Can't read: " + entry.file, e); 346 // Continue to next file 347 } 348 } 349 350 return null; 351 } 352 353 public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 354 if (!DumpUtils.checkDumpAndUsageStatsPermission(getContext(), TAG, pw)) return; 355 356 try { 357 init(); 358 } catch (IOException e) { 359 pw.println("Can't initialize: " + e); 360 Slog.e(TAG, "Can't init", e); 361 return; 362 } 363 364 if (PROFILE_DUMP) Debug.startMethodTracing("/data/trace/dropbox.dump"); 365 366 StringBuilder out = new StringBuilder(); 367 boolean doPrint = false, doFile = false; 368 ArrayList<String> searchArgs = new ArrayList<String>(); 369 for (int i = 0; args != null && i < args.length; i++) { 370 if (args[i].equals("-p") || args[i].equals("--print")) { 371 doPrint = true; 372 } else if (args[i].equals("-f") || args[i].equals("--file")) { 373 doFile = true; 374 } else if (args[i].equals("-h") || args[i].equals("--help")) { 375 pw.println("Dropbox (dropbox) dump options:"); 376 pw.println(" [-h|--help] [-p|--print] [-f|--file] [timestamp]"); 377 pw.println(" -h|--help: print this help"); 378 pw.println(" -p|--print: print full contents of each entry"); 379 pw.println(" -f|--file: print path of each entry's file"); 380 pw.println(" [timestamp] optionally filters to only those entries."); 381 return; 382 } else if (args[i].startsWith("-")) { 383 out.append("Unknown argument: ").append(args[i]).append("\n"); 384 } else { 385 searchArgs.add(args[i]); 386 } 387 } 388 389 out.append("Drop box contents: ").append(mAllFiles.contents.size()).append(" entries\n"); 390 391 if (!searchArgs.isEmpty()) { 392 out.append("Searching for:"); 393 for (String a : searchArgs) out.append(" ").append(a); 394 out.append("\n"); 395 } 396 397 int numFound = 0, numArgs = searchArgs.size(); 398 Time time = new Time(); 399 out.append("\n"); 400 for (EntryFile entry : mAllFiles.contents) { 401 time.set(entry.timestampMillis); 402 String date = time.format("%Y-%m-%d %H:%M:%S"); 403 boolean match = true; 404 for (int i = 0; i < numArgs && match; i++) { 405 String arg = searchArgs.get(i); 406 match = (date.contains(arg) || arg.equals(entry.tag)); 407 } 408 if (!match) continue; 409 410 numFound++; 411 if (doPrint) out.append("========================================\n"); 412 out.append(date).append(" ").append(entry.tag == null ? "(no tag)" : entry.tag); 413 if (entry.file == null) { 414 out.append(" (no file)\n"); 415 continue; 416 } else if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) { 417 out.append(" (contents lost)\n"); 418 continue; 419 } else { 420 out.append(" ("); 421 if ((entry.flags & DropBoxManager.IS_GZIPPED) != 0) out.append("compressed "); 422 out.append((entry.flags & DropBoxManager.IS_TEXT) != 0 ? "text" : "data"); 423 out.append(", ").append(entry.file.length()).append(" bytes)\n"); 424 } 425 426 if (doFile || (doPrint && (entry.flags & DropBoxManager.IS_TEXT) == 0)) { 427 if (!doPrint) out.append(" "); 428 out.append(entry.file.getPath()).append("\n"); 429 } 430 431 if ((entry.flags & DropBoxManager.IS_TEXT) != 0 && (doPrint || !doFile)) { 432 DropBoxManager.Entry dbe = null; 433 InputStreamReader isr = null; 434 try { 435 dbe = new DropBoxManager.Entry( 436 entry.tag, entry.timestampMillis, entry.file, entry.flags); 437 438 if (doPrint) { 439 isr = new InputStreamReader(dbe.getInputStream()); 440 char[] buf = new char[4096]; 441 boolean newline = false; 442 for (;;) { 443 int n = isr.read(buf); 444 if (n <= 0) break; 445 out.append(buf, 0, n); 446 newline = (buf[n - 1] == '\n'); 447 448 // Flush periodically when printing to avoid out-of-memory. 449 if (out.length() > 65536) { 450 pw.write(out.toString()); 451 out.setLength(0); 452 } 453 } 454 if (!newline) out.append("\n"); 455 } else { 456 String text = dbe.getText(70); 457 out.append(" "); 458 if (text == null) { 459 out.append("[null]"); 460 } else { 461 boolean truncated = (text.length() == 70); 462 out.append(text.trim().replace('\n', '/')); 463 if (truncated) out.append(" ..."); 464 } 465 out.append("\n"); 466 } 467 } catch (IOException e) { 468 out.append("*** ").append(e.toString()).append("\n"); 469 Slog.e(TAG, "Can't read: " + entry.file, e); 470 } finally { 471 if (dbe != null) dbe.close(); 472 if (isr != null) { 473 try { 474 isr.close(); 475 } catch (IOException unused) { 476 } 477 } 478 } 479 } 480 481 if (doPrint) out.append("\n"); 482 } 483 484 if (numFound == 0) out.append("(No entries found.)\n"); 485 486 if (args == null || args.length == 0) { 487 if (!doPrint) out.append("\n"); 488 out.append("Usage: dumpsys dropbox [--print|--file] [YYYY-mm-dd] [HH:MM:SS] [tag]\n"); 489 } 490 491 pw.write(out.toString()); 492 if (PROFILE_DUMP) Debug.stopMethodTracing(); 493 } 494 495 /////////////////////////////////////////////////////////////////////////// 496 497 /** Chronologically sorted list of {@link EntryFile} */ 498 private static final class FileList implements Comparable<FileList> { 499 public int blocks = 0; 500 public final TreeSet<EntryFile> contents = new TreeSet<EntryFile>(); 501 502 /** Sorts bigger FileList instances before smaller ones. */ 503 public final int compareTo(FileList o) { 504 if (blocks != o.blocks) return o.blocks - blocks; 505 if (this == o) return 0; 506 if (hashCode() < o.hashCode()) return -1; 507 if (hashCode() > o.hashCode()) return 1; 508 return 0; 509 } 510 } 511 512 /** Metadata describing an on-disk log file. */ 513 private static final class EntryFile implements Comparable<EntryFile> { 514 public final String tag; 515 public final long timestampMillis; 516 public final int flags; 517 public final File file; 518 public final int blocks; 519 520 /** Sorts earlier EntryFile instances before later ones. */ 521 public final int compareTo(EntryFile o) { 522 if (timestampMillis < o.timestampMillis) return -1; 523 if (timestampMillis > o.timestampMillis) return 1; 524 if (file != null && o.file != null) return file.compareTo(o.file); 525 if (o.file != null) return -1; 526 if (file != null) return 1; 527 if (this == o) return 0; 528 if (hashCode() < o.hashCode()) return -1; 529 if (hashCode() > o.hashCode()) return 1; 530 return 0; 531 } 532 533 /** 534 * Moves an existing temporary file to a new log filename. 535 * @param temp file to rename 536 * @param dir to store file in 537 * @param tag to use for new log file name 538 * @param timestampMillis of log entry 539 * @param flags for the entry data 540 * @param blockSize to use for space accounting 541 * @throws IOException if the file can't be moved 542 */ 543 public EntryFile(File temp, File dir, String tag,long timestampMillis, 544 int flags, int blockSize) throws IOException { 545 if ((flags & DropBoxManager.IS_EMPTY) != 0) throw new IllegalArgumentException(); 546 547 this.tag = tag; 548 this.timestampMillis = timestampMillis; 549 this.flags = flags; 550 this.file = new File(dir, Uri.encode(tag) + "@" + timestampMillis + 551 ((flags & DropBoxManager.IS_TEXT) != 0 ? ".txt" : ".dat") + 552 ((flags & DropBoxManager.IS_GZIPPED) != 0 ? ".gz" : "")); 553 554 if (!temp.renameTo(this.file)) { 555 throw new IOException("Can't rename " + temp + " to " + this.file); 556 } 557 this.blocks = (int) ((this.file.length() + blockSize - 1) / blockSize); 558 } 559 560 /** 561 * Creates a zero-length tombstone for a file whose contents were lost. 562 * @param dir to store file in 563 * @param tag to use for new log file name 564 * @param timestampMillis of log entry 565 * @throws IOException if the file can't be created. 566 */ 567 public EntryFile(File dir, String tag, long timestampMillis) throws IOException { 568 this.tag = tag; 569 this.timestampMillis = timestampMillis; 570 this.flags = DropBoxManager.IS_EMPTY; 571 this.file = new File(dir, Uri.encode(tag) + "@" + timestampMillis + ".lost"); 572 this.blocks = 0; 573 new FileOutputStream(this.file).close(); 574 } 575 576 /** 577 * Extracts metadata from an existing on-disk log filename. 578 * @param file name of existing log file 579 * @param blockSize to use for space accounting 580 */ 581 public EntryFile(File file, int blockSize) { 582 this.file = file; 583 this.blocks = (int) ((this.file.length() + blockSize - 1) / blockSize); 584 585 String name = file.getName(); 586 int at = name.lastIndexOf('@'); 587 if (at < 0) { 588 this.tag = null; 589 this.timestampMillis = 0; 590 this.flags = DropBoxManager.IS_EMPTY; 591 return; 592 } 593 594 int flags = 0; 595 this.tag = Uri.decode(name.substring(0, at)); 596 if (name.endsWith(".gz")) { 597 flags |= DropBoxManager.IS_GZIPPED; 598 name = name.substring(0, name.length() - 3); 599 } 600 if (name.endsWith(".lost")) { 601 flags |= DropBoxManager.IS_EMPTY; 602 name = name.substring(at + 1, name.length() - 5); 603 } else if (name.endsWith(".txt")) { 604 flags |= DropBoxManager.IS_TEXT; 605 name = name.substring(at + 1, name.length() - 4); 606 } else if (name.endsWith(".dat")) { 607 name = name.substring(at + 1, name.length() - 4); 608 } else { 609 this.flags = DropBoxManager.IS_EMPTY; 610 this.timestampMillis = 0; 611 return; 612 } 613 this.flags = flags; 614 615 long millis; 616 try { millis = Long.parseLong(name); } catch (NumberFormatException e) { millis = 0; } 617 this.timestampMillis = millis; 618 } 619 620 /** 621 * Creates a EntryFile object with only a timestamp for comparison purposes. 622 * @param millis to compare with. 623 */ 624 public EntryFile(long millis) { 625 this.tag = null; 626 this.timestampMillis = millis; 627 this.flags = DropBoxManager.IS_EMPTY; 628 this.file = null; 629 this.blocks = 0; 630 } 631 } 632 633 /////////////////////////////////////////////////////////////////////////// 634 635 /** If never run before, scans disk contents to build in-memory tracking data. */ 636 private synchronized void init() throws IOException { 637 if (mStatFs == null) { 638 if (!mDropBoxDir.isDirectory() && !mDropBoxDir.mkdirs()) { 639 throw new IOException("Can't mkdir: " + mDropBoxDir); 640 } 641 try { 642 mStatFs = new StatFs(mDropBoxDir.getPath()); 643 mBlockSize = mStatFs.getBlockSize(); 644 } catch (IllegalArgumentException e) { // StatFs throws this on error 645 throw new IOException("Can't statfs: " + mDropBoxDir); 646 } 647 } 648 649 if (mAllFiles == null) { 650 File[] files = mDropBoxDir.listFiles(); 651 if (files == null) throw new IOException("Can't list files: " + mDropBoxDir); 652 653 mAllFiles = new FileList(); 654 mFilesByTag = new HashMap<String, FileList>(); 655 656 // Scan pre-existing files. 657 for (File file : files) { 658 if (file.getName().endsWith(".tmp")) { 659 Slog.i(TAG, "Cleaning temp file: " + file); 660 file.delete(); 661 continue; 662 } 663 664 EntryFile entry = new EntryFile(file, mBlockSize); 665 if (entry.tag == null) { 666 Slog.w(TAG, "Unrecognized file: " + file); 667 continue; 668 } else if (entry.timestampMillis == 0) { 669 Slog.w(TAG, "Invalid filename: " + file); 670 file.delete(); 671 continue; 672 } 673 674 enrollEntry(entry); 675 } 676 } 677 } 678 679 /** Adds a disk log file to in-memory tracking for accounting and enumeration. */ 680 private synchronized void enrollEntry(EntryFile entry) { 681 mAllFiles.contents.add(entry); 682 mAllFiles.blocks += entry.blocks; 683 684 // mFilesByTag is used for trimming, so don't list empty files. 685 // (Zero-length/lost files are trimmed by date from mAllFiles.) 686 687 if (entry.tag != null && entry.file != null && entry.blocks > 0) { 688 FileList tagFiles = mFilesByTag.get(entry.tag); 689 if (tagFiles == null) { 690 tagFiles = new FileList(); 691 mFilesByTag.put(entry.tag, tagFiles); 692 } 693 tagFiles.contents.add(entry); 694 tagFiles.blocks += entry.blocks; 695 } 696 } 697 698 /** Moves a temporary file to a final log filename and enrolls it. */ 699 private synchronized long createEntry(File temp, String tag, int flags) throws IOException { 700 long t = System.currentTimeMillis(); 701 702 // Require each entry to have a unique timestamp; if there are entries 703 // >10sec in the future (due to clock skew), drag them back to avoid 704 // keeping them around forever. 705 706 SortedSet<EntryFile> tail = mAllFiles.contents.tailSet(new EntryFile(t + 10000)); 707 EntryFile[] future = null; 708 if (!tail.isEmpty()) { 709 future = tail.toArray(new EntryFile[tail.size()]); 710 tail.clear(); // Remove from mAllFiles 711 } 712 713 if (!mAllFiles.contents.isEmpty()) { 714 t = Math.max(t, mAllFiles.contents.last().timestampMillis + 1); 715 } 716 717 if (future != null) { 718 for (EntryFile late : future) { 719 mAllFiles.blocks -= late.blocks; 720 FileList tagFiles = mFilesByTag.get(late.tag); 721 if (tagFiles != null && tagFiles.contents.remove(late)) { 722 tagFiles.blocks -= late.blocks; 723 } 724 if ((late.flags & DropBoxManager.IS_EMPTY) == 0) { 725 enrollEntry(new EntryFile( 726 late.file, mDropBoxDir, late.tag, t++, late.flags, mBlockSize)); 727 } else { 728 enrollEntry(new EntryFile(mDropBoxDir, late.tag, t++)); 729 } 730 } 731 } 732 733 if (temp == null) { 734 enrollEntry(new EntryFile(mDropBoxDir, tag, t)); 735 } else { 736 enrollEntry(new EntryFile(temp, mDropBoxDir, tag, t, flags, mBlockSize)); 737 } 738 return t; 739 } 740 741 /** 742 * Trims the files on disk to make sure they aren't using too much space. 743 * @return the overall quota for storage (in bytes) 744 */ 745 private synchronized long trimToFit() throws IOException { 746 // Expunge aged items (including tombstones marking deleted data). 747 748 int ageSeconds = Settings.Global.getInt(mContentResolver, 749 Settings.Global.DROPBOX_AGE_SECONDS, DEFAULT_AGE_SECONDS); 750 int maxFiles = Settings.Global.getInt(mContentResolver, 751 Settings.Global.DROPBOX_MAX_FILES, DEFAULT_MAX_FILES); 752 long cutoffMillis = System.currentTimeMillis() - ageSeconds * 1000; 753 while (!mAllFiles.contents.isEmpty()) { 754 EntryFile entry = mAllFiles.contents.first(); 755 if (entry.timestampMillis > cutoffMillis && mAllFiles.contents.size() < maxFiles) break; 756 757 FileList tag = mFilesByTag.get(entry.tag); 758 if (tag != null && tag.contents.remove(entry)) tag.blocks -= entry.blocks; 759 if (mAllFiles.contents.remove(entry)) mAllFiles.blocks -= entry.blocks; 760 if (entry.file != null) entry.file.delete(); 761 } 762 763 // Compute overall quota (a fraction of available free space) in blocks. 764 // The quota changes dynamically based on the amount of free space; 765 // that way when lots of data is available we can use it, but we'll get 766 // out of the way if storage starts getting tight. 767 768 long uptimeMillis = SystemClock.uptimeMillis(); 769 if (uptimeMillis > mCachedQuotaUptimeMillis + QUOTA_RESCAN_MILLIS) { 770 int quotaPercent = Settings.Global.getInt(mContentResolver, 771 Settings.Global.DROPBOX_QUOTA_PERCENT, DEFAULT_QUOTA_PERCENT); 772 int reservePercent = Settings.Global.getInt(mContentResolver, 773 Settings.Global.DROPBOX_RESERVE_PERCENT, DEFAULT_RESERVE_PERCENT); 774 int quotaKb = Settings.Global.getInt(mContentResolver, 775 Settings.Global.DROPBOX_QUOTA_KB, DEFAULT_QUOTA_KB); 776 777 String dirPath = mDropBoxDir.getPath(); 778 try { 779 mStatFs.restat(dirPath); 780 } catch (IllegalArgumentException e) { // restat throws this on error 781 throw new IOException("Can't restat: " + mDropBoxDir); 782 } 783 int available = mStatFs.getAvailableBlocks(); 784 int nonreserved = available - mStatFs.getBlockCount() * reservePercent / 100; 785 int maximum = quotaKb * 1024 / mBlockSize; 786 mCachedQuotaBlocks = Math.min(maximum, Math.max(0, nonreserved * quotaPercent / 100)); 787 mCachedQuotaUptimeMillis = uptimeMillis; 788 } 789 790 // If we're using too much space, delete old items to make room. 791 // 792 // We trim each tag independently (this is why we keep per-tag lists). 793 // Space is "fairly" shared between tags -- they are all squeezed 794 // equally until enough space is reclaimed. 795 // 796 // A single circular buffer (a la logcat) would be simpler, but this 797 // way we can handle fat/bursty data (like 1MB+ bugreports, 300KB+ 798 // kernel crash dumps, and 100KB+ ANR reports) without swamping small, 799 // well-behaved data streams (event statistics, profile data, etc). 800 // 801 // Deleted files are replaced with zero-length tombstones to mark what 802 // was lost. Tombstones are expunged by age (see above). 803 804 if (mAllFiles.blocks > mCachedQuotaBlocks) { 805 // Find a fair share amount of space to limit each tag 806 int unsqueezed = mAllFiles.blocks, squeezed = 0; 807 TreeSet<FileList> tags = new TreeSet<FileList>(mFilesByTag.values()); 808 for (FileList tag : tags) { 809 if (squeezed > 0 && tag.blocks <= (mCachedQuotaBlocks - unsqueezed) / squeezed) { 810 break; 811 } 812 unsqueezed -= tag.blocks; 813 squeezed++; 814 } 815 int tagQuota = (mCachedQuotaBlocks - unsqueezed) / squeezed; 816 817 // Remove old items from each tag until it meets the per-tag quota. 818 for (FileList tag : tags) { 819 if (mAllFiles.blocks < mCachedQuotaBlocks) break; 820 while (tag.blocks > tagQuota && !tag.contents.isEmpty()) { 821 EntryFile entry = tag.contents.first(); 822 if (tag.contents.remove(entry)) tag.blocks -= entry.blocks; 823 if (mAllFiles.contents.remove(entry)) mAllFiles.blocks -= entry.blocks; 824 825 try { 826 if (entry.file != null) entry.file.delete(); 827 enrollEntry(new EntryFile(mDropBoxDir, entry.tag, entry.timestampMillis)); 828 } catch (IOException e) { 829 Slog.e(TAG, "Can't write tombstone file", e); 830 } 831 } 832 } 833 } 834 835 return mCachedQuotaBlocks * mBlockSize; 836 } 837 } 838
