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