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.Manifest; 20 import android.annotation.Nullable; 21 import android.app.ActivityManager; 22 import android.app.AppOpsManager; 23 import android.app.BroadcastOptions; 24 import android.app.compat.CompatChanges; 25 import android.compat.annotation.ChangeId; 26 import android.compat.annotation.EnabledAfter; 27 import android.content.BroadcastReceiver; 28 import android.content.ContentResolver; 29 import android.content.Context; 30 import android.content.Intent; 31 import android.content.IntentFilter; 32 import android.content.pm.PackageManager; 33 import android.content.res.Resources; 34 import android.database.ContentObserver; 35 import android.net.Uri; 36 import android.os.Binder; 37 import android.os.Build; 38 import android.os.BundleMerger; 39 import android.os.Debug; 40 import android.os.DropBoxManager; 41 import android.os.FileUtils; 42 import android.os.Handler; 43 import android.os.Looper; 44 import android.os.Message; 45 import android.os.ParcelFileDescriptor; 46 import android.os.ResultReceiver; 47 import android.os.ShellCallback; 48 import android.os.ShellCommand; 49 import android.os.StatFs; 50 import android.os.SystemClock; 51 import android.os.UserHandle; 52 import android.provider.Settings; 53 import android.service.dropbox.DropBoxManagerServiceDumpProto; 54 import android.system.ErrnoException; 55 import android.system.Os; 56 import android.system.OsConstants; 57 import android.system.StructStat; 58 import android.text.TextUtils; 59 import android.text.format.TimeMigrationUtils; 60 import android.util.ArrayMap; 61 import android.util.ArraySet; 62 import android.util.Slog; 63 import android.util.proto.ProtoOutputStream; 64 65 import com.android.internal.R; 66 import com.android.internal.annotations.GuardedBy; 67 import com.android.internal.annotations.VisibleForTesting; 68 import com.android.internal.os.IDropBoxManagerService; 69 import com.android.internal.util.DumpUtils; 70 import com.android.internal.util.FrameworkStatsLog; 71 import com.android.internal.util.ObjectUtils; 72 import com.android.server.DropBoxManagerInternal.EntrySource; 73 import com.android.server.feature.flags.Flags; 74 75 import libcore.io.IoUtils; 76 77 import java.io.ByteArrayInputStream; 78 import java.io.File; 79 import java.io.FileDescriptor; 80 import java.io.FileOutputStream; 81 import java.io.IOException; 82 import java.io.InputStream; 83 import java.io.InputStreamReader; 84 import java.io.PrintWriter; 85 import java.util.ArrayList; 86 import java.util.Arrays; 87 import java.util.List; 88 import java.util.SortedSet; 89 import java.util.TreeSet; 90 import java.util.zip.GZIPOutputStream; 91 92 /** 93 * Implementation of {@link IDropBoxManagerService} using the filesystem. 94 * Clients use {@link DropBoxManager} to access this service. 95 */ 96 public final class DropBoxManagerService extends SystemService { 97 /** 98 * For Android U and earlier versions, apps can continue to use the READ_LOGS permission, 99 * but for all subsequent versions, the READ_DROPBOX_DATA permission must be used. 100 */ 101 @ChangeId 102 @EnabledAfter(targetSdkVersion = Build.VERSION_CODES.UPSIDE_DOWN_CAKE) 103 private static final long ENFORCE_READ_DROPBOX_DATA = 296060945L; 104 private static final String TAG = "DropBoxManagerService"; 105 private static final int DEFAULT_AGE_SECONDS = 3 * 86400; 106 private static final int DEFAULT_MAX_FILES = 1000; 107 private static final int DEFAULT_MAX_FILES_LOWRAM = 300; 108 public static final int DEFAULT_QUOTA_KB = Build.IS_USERDEBUG ? 20 * 1024 : 10 * 1024; 109 private static final int DEFAULT_QUOTA_PERCENT = 10; 110 private static final int DEFAULT_RESERVE_PERCENT = 0; 111 private static final int QUOTA_RESCAN_MILLIS = 5000; 112 113 private static final boolean PROFILE_DUMP = false; 114 115 // Max number of bytes of a dropbox entry to write into protobuf. 116 private static final int PROTO_MAX_DATA_BYTES = 256 * 1024; 117 118 // Size beyond which to force-compress newly added entries. 119 private static final long COMPRESS_THRESHOLD_BYTES = 16_384; 120 121 // Tags that we should drop by default. 122 private static final List<String> DISABLED_BY_DEFAULT_TAGS = 123 List.of("data_app_wtf", "system_app_wtf", "system_server_wtf"); 124 // TODO: This implementation currently uses one file per entry, which is 125 // inefficient for smallish entries -- consider using a single queue file 126 // per tag (or even globally) instead. 127 128 // The cached context and derived objects 129 130 private final ContentResolver mContentResolver; 131 private final File mDropBoxDir; 132 133 // Accounting of all currently written log files (set in init()). 134 135 private FileList mAllFiles = null; 136 private ArrayMap<String, FileList> mFilesByTag = null; 137 138 private long mLowPriorityRateLimitPeriod = 0; 139 private ArraySet<String> mLowPriorityTags = null; 140 141 // Various bits of disk information 142 143 private StatFs mStatFs = null; 144 private int mBlockSize = 0; 145 private int mCachedQuotaBlocks = 0; // Space we can use: computed from free space, etc. 146 private long mCachedQuotaUptimeMillis = 0; 147 148 private volatile boolean mBooted = false; 149 150 // Provide a way to perform sendBroadcast asynchronously to avoid deadlocks. 151 private final DropBoxManagerBroadcastHandler mHandler; 152 153 private int mMaxFiles = -1; // -1 means uninitialized. 154 155 /** Receives events that might indicate a need to clean up files. */ 156 private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 157 @Override 158 public void onReceive(Context context, Intent intent) { 159 // For ACTION_DEVICE_STORAGE_LOW: 160 mCachedQuotaUptimeMillis = 0; // Force a re-check of quota size 161 162 // Run the initialization in the background (not this main thread). 163 // The init() and trimToFit() methods are synchronized, so they still 164 // block other users -- but at least the onReceive() call can finish. 165 new Thread() { 166 public void run() { 167 try { 168 init(); 169 trimToFit(); 170 } catch (IOException e) { 171 Slog.e(TAG, "Can't init", e); 172 } 173 } 174 }.start(); 175 } 176 }; 177 178 private static final BundleMerger sDropboxEntryAddedExtrasMerger; 179 static { 180 sDropboxEntryAddedExtrasMerger = new BundleMerger(); 181 sDropboxEntryAddedExtrasMerger.setDefaultMergeStrategy(BundleMerger.STRATEGY_FIRST); sDropboxEntryAddedExtrasMerger.setMergeStrategy(DropBoxManager.EXTRA_TIME, BundleMerger.STRATEGY_COMPARABLE_MAX)182 sDropboxEntryAddedExtrasMerger.setMergeStrategy(DropBoxManager.EXTRA_TIME, 183 BundleMerger.STRATEGY_COMPARABLE_MAX); sDropboxEntryAddedExtrasMerger.setMergeStrategy(DropBoxManager.EXTRA_DROPPED_COUNT, BundleMerger.STRATEGY_NUMBER_INCREMENT_FIRST_AND_ADD)184 sDropboxEntryAddedExtrasMerger.setMergeStrategy(DropBoxManager.EXTRA_DROPPED_COUNT, 185 BundleMerger.STRATEGY_NUMBER_INCREMENT_FIRST_AND_ADD); 186 } 187 188 private final IDropBoxManagerService.Stub mStub = new IDropBoxManagerService.Stub() { 189 @Override 190 public void addData(String tag, byte[] data, int flags) { 191 DropBoxManagerService.this.addData(tag, data, flags); 192 } 193 194 @Override 195 public void addFile(String tag, ParcelFileDescriptor fd, int flags) { 196 DropBoxManagerService.this.addFile(tag, fd, flags); 197 } 198 199 @Override 200 public boolean isTagEnabled(String tag) { 201 return DropBoxManagerService.this.isTagEnabled(tag); 202 } 203 204 @Override 205 public DropBoxManager.Entry getNextEntry(String tag, long millis, String callingPackage) { 206 return getNextEntryWithAttribution(tag, millis, callingPackage, null); 207 } 208 209 @Override 210 public DropBoxManager.Entry getNextEntryWithAttribution(String tag, long millis, 211 String callingPackage, String callingAttributionTag) { 212 return DropBoxManagerService.this.getNextEntry(tag, millis, callingPackage, 213 callingAttributionTag); 214 } 215 216 @Override 217 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 218 DropBoxManagerService.this.dump(fd, pw, args); 219 } 220 221 @Override 222 public void onShellCommand(FileDescriptor in, FileDescriptor out, 223 FileDescriptor err, String[] args, ShellCallback callback, 224 ResultReceiver resultReceiver) { 225 (new ShellCmd()).exec(this, in, out, err, args, callback, resultReceiver); 226 } 227 }; 228 229 private class ShellCmd extends ShellCommand { 230 @Override onCommand(String cmd)231 public int onCommand(String cmd) { 232 if (cmd == null) { 233 return handleDefaultCommands(cmd); 234 } 235 final PrintWriter pw = getOutPrintWriter(); 236 try { 237 switch (cmd) { 238 case "set-rate-limit": 239 final long period = Long.parseLong(getNextArgRequired()); 240 DropBoxManagerService.this.setLowPriorityRateLimit(period); 241 break; 242 case "add-low-priority": 243 final String addedTag = getNextArgRequired(); 244 DropBoxManagerService.this.addLowPriorityTag(addedTag); 245 break; 246 case "remove-low-priority": 247 final String removeTag = getNextArgRequired(); 248 DropBoxManagerService.this.removeLowPriorityTag(removeTag); 249 break; 250 case "restore-defaults": 251 DropBoxManagerService.this.restoreDefaults(); 252 break; 253 default: 254 return handleDefaultCommands(cmd); 255 } 256 } catch (Exception e) { 257 pw.println(e); 258 } 259 return 0; 260 } 261 262 @Override onHelp()263 public void onHelp() { 264 PrintWriter pw = getOutPrintWriter(); 265 pw.println("Dropbox manager service commands:"); 266 pw.println(" help"); 267 pw.println(" Print this help text."); 268 pw.println(" set-rate-limit PERIOD"); 269 pw.println(" Sets low priority broadcast rate limit period to PERIOD ms"); 270 pw.println(" add-low-priority TAG"); 271 pw.println(" Add TAG to dropbox low priority list"); 272 pw.println(" remove-low-priority TAG"); 273 pw.println(" Remove TAG from dropbox low priority list"); 274 pw.println(" restore-defaults"); 275 pw.println(" restore dropbox settings to defaults"); 276 } 277 } 278 279 private class DropBoxManagerBroadcastHandler extends Handler { 280 private final Object mLock = new Object(); 281 282 static final int MSG_SEND_BROADCAST = 1; 283 static final int MSG_SEND_DEFERRED_BROADCAST = 2; 284 285 @GuardedBy("mLock") 286 private final ArrayMap<String, Intent> mDeferredMap = new ArrayMap(); 287 DropBoxManagerBroadcastHandler(Looper looper)288 DropBoxManagerBroadcastHandler(Looper looper) { 289 super(looper); 290 } 291 292 @Override handleMessage(Message msg)293 public void handleMessage(Message msg) { 294 switch (msg.what) { 295 case MSG_SEND_BROADCAST: 296 prepareAndSendBroadcast((Intent) msg.obj, false); 297 break; 298 case MSG_SEND_DEFERRED_BROADCAST: 299 Intent deferredIntent; 300 synchronized (mLock) { 301 deferredIntent = mDeferredMap.remove((String) msg.obj); 302 } 303 if (deferredIntent != null) { 304 prepareAndSendBroadcast(deferredIntent, true); 305 } 306 break; 307 } 308 } 309 prepareAndSendBroadcast(Intent intent, boolean deferrable)310 private void prepareAndSendBroadcast(Intent intent, boolean deferrable) { 311 if (!DropBoxManagerService.this.mBooted) { 312 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 313 } 314 final BroadcastOptions options = BroadcastOptions.makeBasic(); 315 if (Flags.enableReadDropboxPermission()) { 316 options.setRequireCompatChange(ENFORCE_READ_DROPBOX_DATA, true); 317 if (deferrable) { 318 final String matchingKey = intent.getStringExtra(DropBoxManager.EXTRA_TAG) 319 + "-READ_DROPBOX_DATA"; 320 setBroadcastOptionsForDeferral(options, matchingKey); 321 } 322 getContext().sendBroadcastAsUser(intent, UserHandle.ALL, 323 Manifest.permission.READ_DROPBOX_DATA, options.toBundle()); 324 325 options.setRequireCompatChange(ENFORCE_READ_DROPBOX_DATA, false); 326 if (deferrable) { 327 final String matchingKey = intent.getStringExtra(DropBoxManager.EXTRA_TAG) 328 + "-READ_LOGS"; 329 setBroadcastOptionsForDeferral(options, matchingKey); 330 } 331 getContext().sendBroadcastAsUser(intent, UserHandle.ALL, 332 Manifest.permission.READ_LOGS, options.toBundle()); 333 } else { 334 if (deferrable) { 335 final String matchingKey = intent.getStringExtra(DropBoxManager.EXTRA_TAG); 336 setBroadcastOptionsForDeferral(options, matchingKey); 337 } 338 getContext().sendBroadcastAsUser(intent, UserHandle.ALL, 339 android.Manifest.permission.READ_LOGS, options.toBundle()); 340 } 341 } 342 createIntent(String tag, long time)343 private Intent createIntent(String tag, long time) { 344 final Intent dropboxIntent = new Intent(DropBoxManager.ACTION_DROPBOX_ENTRY_ADDED); 345 dropboxIntent.putExtra(DropBoxManager.EXTRA_TAG, tag); 346 dropboxIntent.putExtra(DropBoxManager.EXTRA_TIME, time); 347 dropboxIntent.putExtra(DropBoxManager.EXTRA_DROPPED_COUNT, 0); 348 return dropboxIntent; 349 } 350 setBroadcastOptionsForDeferral(BroadcastOptions options, String matchingKey)351 private void setBroadcastOptionsForDeferral(BroadcastOptions options, String matchingKey) { 352 options.setDeliveryGroupPolicy(BroadcastOptions.DELIVERY_GROUP_POLICY_MERGED) 353 .setDeliveryGroupMatchingKey(DropBoxManager.ACTION_DROPBOX_ENTRY_ADDED, 354 matchingKey) 355 .setDeliveryGroupExtrasMerger(sDropboxEntryAddedExtrasMerger) 356 .setDeferralPolicy(BroadcastOptions.DEFERRAL_POLICY_UNTIL_ACTIVE); 357 } 358 359 /** 360 * Schedule a dropbox broadcast to be sent asynchronously. 361 */ sendBroadcast(String tag, long time)362 public void sendBroadcast(String tag, long time) { 363 sendMessage(obtainMessage(MSG_SEND_BROADCAST, createIntent(tag, time))); 364 } 365 366 /** 367 * Possibly schedule a delayed dropbox broadcast. The broadcast will only be scheduled if 368 * no broadcast is currently scheduled. Otherwise updated the scheduled broadcast with the 369 * new intent information, effectively dropping the previous broadcast. 370 */ maybeDeferBroadcast(String tag, long time)371 public void maybeDeferBroadcast(String tag, long time) { 372 synchronized (mLock) { 373 final Intent intent = mDeferredMap.get(tag); 374 if (intent == null) { 375 // Schedule new delayed broadcast. 376 mDeferredMap.put(tag, createIntent(tag, time)); 377 sendMessageDelayed(obtainMessage(MSG_SEND_DEFERRED_BROADCAST, tag), 378 mLowPriorityRateLimitPeriod); 379 } else { 380 // Broadcast is already scheduled. Update intent with new data. 381 intent.putExtra(DropBoxManager.EXTRA_TIME, time); 382 final int dropped = intent.getIntExtra(DropBoxManager.EXTRA_DROPPED_COUNT, 0); 383 intent.putExtra(DropBoxManager.EXTRA_DROPPED_COUNT, dropped + 1); 384 return; 385 } 386 } 387 } 388 } 389 390 /** 391 * Creates an instance of managed drop box storage using the default dropbox 392 * directory. 393 * 394 * @param context to use for receiving free space & gservices intents 395 */ DropBoxManagerService(final Context context)396 public DropBoxManagerService(final Context context) { 397 this(context, new File("/data/system/dropbox"), FgThread.get().getLooper()); 398 } 399 400 /** 401 * Creates an instance of managed drop box storage. Normally there is one of these 402 * run by the system, but others can be created for testing and other purposes. 403 * 404 * @param context to use for receiving free space & gservices intents 405 * @param path to store drop box entries in 406 */ 407 @VisibleForTesting DropBoxManagerService(final Context context, File path, Looper looper)408 public DropBoxManagerService(final Context context, File path, Looper looper) { 409 super(context); 410 mDropBoxDir = path; 411 mContentResolver = getContext().getContentResolver(); 412 mHandler = new DropBoxManagerBroadcastHandler(looper); 413 LocalServices.addService(DropBoxManagerInternal.class, new DropBoxManagerInternalImpl()); 414 } 415 416 @Override onStart()417 public void onStart() { 418 publishBinderService(Context.DROPBOX_SERVICE, mStub); 419 420 // The real work gets done lazily in init() -- that way service creation always 421 // succeeds, and things like disk problems cause individual method failures. 422 } 423 424 @Override onBootPhase(int phase)425 public void onBootPhase(int phase) { 426 switch (phase) { 427 case PHASE_SYSTEM_SERVICES_READY: 428 IntentFilter filter = new IntentFilter(); 429 filter.addAction(Intent.ACTION_DEVICE_STORAGE_LOW); 430 getContext().registerReceiver(mReceiver, filter); 431 432 mContentResolver.registerContentObserver( 433 Settings.Global.CONTENT_URI, true, 434 new ContentObserver(new Handler()) { 435 @Override 436 public void onChange(boolean selfChange) { 437 mReceiver.onReceive(getContext(), (Intent) null); 438 } 439 }); 440 441 getLowPriorityResourceConfigs(); 442 break; 443 444 case PHASE_BOOT_COMPLETED: 445 mBooted = true; 446 break; 447 } 448 } 449 450 /** Retrieves the binder stub -- for test instances */ getServiceStub()451 public IDropBoxManagerService getServiceStub() { 452 return mStub; 453 } 454 addData(String tag, byte[] data, int flags)455 public void addData(String tag, byte[] data, int flags) { 456 addEntry(tag, new ByteArrayInputStream(data), data.length, flags); 457 } 458 addFile(String tag, ParcelFileDescriptor fd, int flags)459 public void addFile(String tag, ParcelFileDescriptor fd, int flags) { 460 final StructStat stat; 461 try { 462 stat = Os.fstat(fd.getFileDescriptor()); 463 464 // Verify caller isn't playing games with pipes or sockets 465 if (!OsConstants.S_ISREG(stat.st_mode)) { 466 throw new IllegalArgumentException(tag + " entry must be real file"); 467 } 468 } catch (ErrnoException e) { 469 throw new IllegalArgumentException(e); 470 } 471 472 addEntry(tag, new ParcelFileDescriptor.AutoCloseInputStream(fd), stat.st_size, flags); 473 } 474 addEntry(String tag, InputStream in, long length, int flags)475 public void addEntry(String tag, InputStream in, long length, int flags) { 476 // If entry being added is large, and if it's not already compressed, 477 // then we'll force compress it during write 478 boolean forceCompress = false; 479 if ((flags & DropBoxManager.IS_GZIPPED) == 0 480 && length > COMPRESS_THRESHOLD_BYTES) { 481 forceCompress = true; 482 flags |= DropBoxManager.IS_GZIPPED; 483 } 484 485 addEntry(tag, new SimpleEntrySource(in, length, forceCompress), flags); 486 } 487 488 /** 489 * Simple entry which contains data ready to be written. 490 */ 491 public static class SimpleEntrySource implements EntrySource { 492 private final InputStream in; 493 private final long length; 494 private final boolean forceCompress; 495 SimpleEntrySource(InputStream in, long length, boolean forceCompress)496 public SimpleEntrySource(InputStream in, long length, boolean forceCompress) { 497 this.in = in; 498 this.length = length; 499 this.forceCompress = forceCompress; 500 } 501 length()502 public long length() { 503 return length; 504 } 505 506 @Override writeTo(FileDescriptor fd)507 public void writeTo(FileDescriptor fd) throws IOException { 508 // No need to buffer the output here, since data is either coming 509 // from an in-memory buffer, or another file on disk; if we buffered 510 // we'd lose out on sendfile() optimizations 511 if (forceCompress) { 512 final GZIPOutputStream gzipOutputStream = 513 new GZIPOutputStream(new FileOutputStream(fd)); 514 FileUtils.copy(in, gzipOutputStream); 515 gzipOutputStream.close(); 516 } else { 517 FileUtils.copy(in, new FileOutputStream(fd)); 518 } 519 } 520 521 @Override close()522 public void close() throws IOException { 523 FileUtils.closeQuietly(in); 524 } 525 } 526 addEntry(String tag, EntrySource entry, int flags)527 public void addEntry(String tag, EntrySource entry, int flags) { 528 File temp = null; 529 try { 530 Slog.i(TAG, "add tag=" + tag + " isTagEnabled=" + isTagEnabled(tag) 531 + " flags=0x" + Integer.toHexString(flags)); 532 if ((flags & DropBoxManager.IS_EMPTY) != 0) throw new IllegalArgumentException(); 533 534 init(); 535 536 // Bail early if we know tag is disabled 537 if (!isTagEnabled(tag)) return; 538 539 // Drop entries which are too large for our quota 540 final long length = entry.length(); 541 final long max = trimToFit(); 542 if (length > max) { 543 // Log and fall through to create empty tombstone below 544 Slog.w(TAG, "Dropping: " + tag + " (" + length + " > " + max + " bytes)"); 545 logDropboxDropped( 546 FrameworkStatsLog.DROPBOX_ENTRY_DROPPED__DROP_REASON__ENTRY_TOO_LARGE, 547 tag, 548 0); 549 } else { 550 temp = new File(mDropBoxDir, "drop" + Thread.currentThread().getId() + ".tmp"); 551 try (FileOutputStream out = new FileOutputStream(temp)) { 552 entry.writeTo(out.getFD()); 553 } 554 } 555 556 // Writing above succeeded, so create the finalized entry 557 long time = createEntry(temp, tag, flags); 558 temp = null; 559 560 // Call sendBroadcast after returning from this call to avoid deadlock. In particular 561 // the caller may be holding the WindowManagerService lock but sendBroadcast requires a 562 // lock in ActivityManagerService. ActivityManagerService has been caught holding that 563 // very lock while waiting for the WindowManagerService lock. 564 if (mLowPriorityTags != null && mLowPriorityTags.contains(tag)) { 565 // Rate limit low priority Dropbox entries 566 mHandler.maybeDeferBroadcast(tag, time); 567 } else { 568 mHandler.sendBroadcast(tag, time); 569 } 570 } catch (IOException e) { 571 Slog.e(TAG, "Can't write: " + tag, e); 572 logDropboxDropped( 573 FrameworkStatsLog.DROPBOX_ENTRY_DROPPED__DROP_REASON__WRITE_FAILURE, 574 tag, 575 0); 576 } finally { 577 IoUtils.closeQuietly(entry); 578 if (temp != null) temp.delete(); 579 } 580 } 581 logDropboxDropped(int reason, String tag, long entryAge)582 private void logDropboxDropped(int reason, String tag, long entryAge) { 583 FrameworkStatsLog.write(FrameworkStatsLog.DROPBOX_ENTRY_DROPPED, reason, tag, entryAge); 584 } 585 isTagEnabled(String tag)586 public boolean isTagEnabled(String tag) { 587 final long token = Binder.clearCallingIdentity(); 588 try { 589 if (DISABLED_BY_DEFAULT_TAGS.contains(tag)) { 590 return "enabled".equals(Settings.Global.getString( 591 mContentResolver, Settings.Global.DROPBOX_TAG_PREFIX + tag)); 592 } else { 593 return !"disabled".equals(Settings.Global.getString( 594 mContentResolver, Settings.Global.DROPBOX_TAG_PREFIX + tag)); 595 } 596 } finally { 597 Binder.restoreCallingIdentity(token); 598 } 599 } 600 checkPermission(int callingUid, String callingPackage, @Nullable String callingAttributionTag)601 private boolean checkPermission(int callingUid, String callingPackage, 602 @Nullable String callingAttributionTag) { 603 // If callers have this permission, then we don't need to check 604 // USAGE_STATS, because they are part of the system and have agreed to 605 // check USAGE_STATS before passing the data along. 606 if (getContext().checkCallingPermission(android.Manifest.permission.PEEK_DROPBOX_DATA) 607 == PackageManager.PERMISSION_GRANTED) { 608 return true; 609 } 610 611 612 String permission = Manifest.permission.READ_LOGS; 613 if (Flags.enableReadDropboxPermission() 614 && CompatChanges.isChangeEnabled(ENFORCE_READ_DROPBOX_DATA, callingUid)) { 615 permission = Manifest.permission.READ_DROPBOX_DATA; 616 } 617 618 // Callers always need this permission 619 getContext().enforceCallingOrSelfPermission(permission, TAG); 620 621 622 // Callers also need the ability to read usage statistics 623 switch (getContext().getSystemService(AppOpsManager.class).noteOp( 624 AppOpsManager.OP_GET_USAGE_STATS, callingUid, callingPackage, callingAttributionTag, 625 null)) { 626 case AppOpsManager.MODE_ALLOWED: 627 return true; 628 case AppOpsManager.MODE_DEFAULT: 629 getContext().enforceCallingOrSelfPermission( 630 android.Manifest.permission.PACKAGE_USAGE_STATS, TAG); 631 return true; 632 default: 633 return false; 634 } 635 } 636 getNextEntry(String tag, long millis, String callingPackage, @Nullable String callingAttributionTag)637 public synchronized DropBoxManager.Entry getNextEntry(String tag, long millis, 638 String callingPackage, @Nullable String callingAttributionTag) { 639 if (!checkPermission(Binder.getCallingUid(), callingPackage, callingAttributionTag)) { 640 return null; 641 } 642 643 try { 644 init(); 645 } catch (IOException e) { 646 Slog.e(TAG, "Can't init", e); 647 return null; 648 } 649 650 FileList list = tag == null ? mAllFiles : mFilesByTag.get(tag); 651 if (list == null) return null; 652 653 for (EntryFile entry : list.contents.tailSet(new EntryFile(millis + 1))) { 654 if (entry.tag == null) continue; 655 if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) { 656 return new DropBoxManager.Entry(entry.tag, entry.timestampMillis); 657 } 658 final File file = entry.getFile(mDropBoxDir); 659 try { 660 return new DropBoxManager.Entry( 661 entry.tag, entry.timestampMillis, file, entry.flags); 662 } catch (IOException e) { 663 Slog.wtf(TAG, "Can't read: " + file, e); 664 // Continue to next file 665 } 666 } 667 668 return null; 669 } 670 setLowPriorityRateLimit(long period)671 private synchronized void setLowPriorityRateLimit(long period) { 672 mLowPriorityRateLimitPeriod = period; 673 } 674 addLowPriorityTag(String tag)675 private synchronized void addLowPriorityTag(String tag) { 676 mLowPriorityTags.add(tag); 677 } 678 removeLowPriorityTag(String tag)679 private synchronized void removeLowPriorityTag(String tag) { 680 mLowPriorityTags.remove(tag); 681 } 682 restoreDefaults()683 private synchronized void restoreDefaults() { 684 getLowPriorityResourceConfigs(); 685 } 686 dump(FileDescriptor fd, PrintWriter pw, String[] args)687 public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 688 if (!DumpUtils.checkDumpAndUsageStatsPermission(getContext(), TAG, pw)) return; 689 690 try { 691 init(); 692 } catch (IOException e) { 693 pw.println("Can't initialize: " + e); 694 Slog.e(TAG, "Can't init", e); 695 return; 696 } 697 698 if (PROFILE_DUMP) Debug.startMethodTracing("/data/trace/dropbox.dump"); 699 700 StringBuilder out = new StringBuilder(); 701 boolean doPrint = false, doFile = false; 702 boolean dumpProto = false; 703 ArrayList<String> searchArgs = new ArrayList<String>(); 704 for (int i = 0; args != null && i < args.length; i++) { 705 if (args[i].equals("-p") || args[i].equals("--print")) { 706 doPrint = true; 707 } else if (args[i].equals("-f") || args[i].equals("--file")) { 708 doFile = true; 709 } else if (args[i].equals("--proto")) { 710 dumpProto = true; 711 } else if (args[i].equals("-h") || args[i].equals("--help")) { 712 pw.println("Dropbox (dropbox) dump options:"); 713 pw.println(" [-h|--help] [-p|--print] [-f|--file] [timestamp]"); 714 pw.println(" -h|--help: print this help"); 715 pw.println(" -p|--print: print full contents of each entry"); 716 pw.println(" -f|--file: print path of each entry's file"); 717 pw.println(" --proto: dump data to proto"); 718 pw.println(" [timestamp] optionally filters to only those entries."); 719 return; 720 } else if (args[i].startsWith("-")) { 721 out.append("Unknown argument: ").append(args[i]).append("\n"); 722 } else { 723 searchArgs.add(args[i]); 724 } 725 } 726 727 if (dumpProto) { 728 dumpProtoLocked(fd, searchArgs); 729 return; 730 } 731 732 out.append("Drop box contents: ").append(mAllFiles.contents.size()).append(" entries\n"); 733 out.append("Max entries: ").append(mMaxFiles).append("\n"); 734 735 out.append("Low priority rate limit period: "); 736 out.append(mLowPriorityRateLimitPeriod).append(" ms\n"); 737 out.append("Low priority tags: ").append(mLowPriorityTags).append("\n"); 738 739 if (!searchArgs.isEmpty()) { 740 out.append("Searching for:"); 741 for (String a : searchArgs) out.append(" ").append(a); 742 out.append("\n"); 743 } 744 745 int numFound = 0; 746 out.append("\n"); 747 for (EntryFile entry : mAllFiles.contents) { 748 if (!matchEntry(entry, searchArgs)) continue; 749 750 numFound++; 751 if (doPrint) out.append("========================================\n"); 752 753 String date = TimeMigrationUtils.formatMillisWithFixedFormat(entry.timestampMillis); 754 out.append(date).append(" ").append(entry.tag == null ? "(no tag)" : entry.tag); 755 756 final File file = entry.getFile(mDropBoxDir); 757 if (file == null) { 758 out.append(" (no file)\n"); 759 continue; 760 } else if ((entry.flags & DropBoxManager.IS_EMPTY) != 0) { 761 out.append(" (contents lost)\n"); 762 continue; 763 } else { 764 out.append(" ("); 765 if ((entry.flags & DropBoxManager.IS_GZIPPED) != 0) out.append("compressed "); 766 out.append((entry.flags & DropBoxManager.IS_TEXT) != 0 ? "text" : "data"); 767 out.append(", ").append(file.length()).append(" bytes)\n"); 768 } 769 770 if (doFile || (doPrint && (entry.flags & DropBoxManager.IS_TEXT) == 0)) { 771 if (!doPrint) out.append(" "); 772 out.append(file.getPath()).append("\n"); 773 } 774 775 if ((entry.flags & DropBoxManager.IS_TEXT) != 0 && doPrint) { 776 DropBoxManager.Entry dbe = null; 777 InputStreamReader isr = null; 778 try { 779 dbe = new DropBoxManager.Entry( 780 entry.tag, entry.timestampMillis, file, entry.flags); 781 782 if (doPrint) { 783 isr = new InputStreamReader(dbe.getInputStream()); 784 char[] buf = new char[4096]; 785 boolean newline = false; 786 for (;;) { 787 int n = isr.read(buf); 788 if (n <= 0) break; 789 out.append(buf, 0, n); 790 newline = (buf[n - 1] == '\n'); 791 792 // Flush periodically when printing to avoid out-of-memory. 793 if (out.length() > 65536) { 794 pw.write(out.toString()); 795 out.setLength(0); 796 } 797 } 798 if (!newline) out.append("\n"); 799 } 800 } catch (IOException e) { 801 out.append("*** ").append(e.toString()).append("\n"); 802 Slog.e(TAG, "Can't read: " + file, e); 803 } finally { 804 if (dbe != null) dbe.close(); 805 if (isr != null) { 806 try { 807 isr.close(); 808 } catch (IOException unused) { 809 } 810 } 811 } 812 } 813 814 if (doPrint) out.append("\n"); 815 } 816 817 if (numFound == 0) out.append("(No entries found.)\n"); 818 819 if (args == null || args.length == 0) { 820 if (!doPrint) out.append("\n"); 821 out.append("Usage: dumpsys dropbox [--print|--file] [YYYY-mm-dd] [HH:MM:SS] [tag]\n"); 822 } 823 824 pw.write(out.toString()); 825 if (PROFILE_DUMP) Debug.stopMethodTracing(); 826 } 827 matchEntry(EntryFile entry, ArrayList<String> searchArgs)828 private boolean matchEntry(EntryFile entry, ArrayList<String> searchArgs) { 829 String date = TimeMigrationUtils.formatMillisWithFixedFormat(entry.timestampMillis); 830 boolean match = true; 831 int numArgs = searchArgs.size(); 832 for (int i = 0; i < numArgs && match; i++) { 833 String arg = searchArgs.get(i); 834 match = (date.contains(arg) || arg.equals(entry.tag)); 835 } 836 return match; 837 } 838 dumpProtoLocked(FileDescriptor fd, ArrayList<String> searchArgs)839 private void dumpProtoLocked(FileDescriptor fd, ArrayList<String> searchArgs) { 840 final ProtoOutputStream proto = new ProtoOutputStream(fd); 841 842 for (EntryFile entry : mAllFiles.contents) { 843 if (!matchEntry(entry, searchArgs)) continue; 844 845 final File file = entry.getFile(mDropBoxDir); 846 if ((file == null) || ((entry.flags & DropBoxManager.IS_EMPTY) != 0)) { 847 continue; 848 } 849 850 final long bToken = proto.start(DropBoxManagerServiceDumpProto.ENTRIES); 851 proto.write(DropBoxManagerServiceDumpProto.Entry.TIME_MS, entry.timestampMillis); 852 try ( 853 DropBoxManager.Entry dbe = new DropBoxManager.Entry( 854 entry.tag, entry.timestampMillis, file, entry.flags); 855 InputStream is = dbe.getInputStream(); 856 ) { 857 if (is != null) { 858 byte[] buf = new byte[PROTO_MAX_DATA_BYTES]; 859 int readBytes = 0; 860 int n = 0; 861 while (n >= 0 && (readBytes += n) < PROTO_MAX_DATA_BYTES) { 862 n = is.read(buf, readBytes, PROTO_MAX_DATA_BYTES - readBytes); 863 } 864 proto.write(DropBoxManagerServiceDumpProto.Entry.DATA, 865 Arrays.copyOf(buf, readBytes)); 866 } 867 } catch (IOException e) { 868 Slog.e(TAG, "Can't read: " + file, e); 869 } 870 871 proto.end(bToken); 872 } 873 874 proto.flush(); 875 } 876 877 /////////////////////////////////////////////////////////////////////////// 878 879 /** Chronologically sorted list of {@link EntryFile} */ 880 private static final class FileList implements Comparable<FileList> { 881 public int blocks = 0; 882 public final TreeSet<EntryFile> contents = new TreeSet<EntryFile>(); 883 884 /** Sorts bigger FileList instances before smaller ones. */ compareTo(FileList o)885 public final int compareTo(FileList o) { 886 if (blocks != o.blocks) return o.blocks - blocks; 887 if (this == o) return 0; 888 if (hashCode() < o.hashCode()) return -1; 889 if (hashCode() > o.hashCode()) return 1; 890 return 0; 891 } 892 } 893 894 /** 895 * Metadata describing an on-disk log file. 896 * 897 * Note its instances do no have knowledge on what directory they're stored, just to save 898 * 4/8 bytes per instance. Instead, {@link #getFile} takes a directory so it can build a 899 * fullpath. 900 */ 901 @VisibleForTesting 902 static final class EntryFile implements Comparable<EntryFile> { 903 public final String tag; 904 public final long timestampMillis; 905 public final int flags; 906 public final int blocks; 907 908 /** Sorts earlier EntryFile instances before later ones. */ compareTo(EntryFile o)909 public final int compareTo(EntryFile o) { 910 int comp = Long.compare(timestampMillis, o.timestampMillis); 911 if (comp != 0) return comp; 912 913 comp = ObjectUtils.compare(tag, o.tag); 914 if (comp != 0) return comp; 915 916 comp = Integer.compare(flags, o.flags); 917 if (comp != 0) return comp; 918 919 return Integer.compare(hashCode(), o.hashCode()); 920 } 921 922 /** 923 * Moves an existing temporary file to a new log filename. 924 * 925 * @param temp file to rename 926 * @param dir to store file in 927 * @param tag to use for new log file name 928 * @param timestampMillis of log entry 929 * @param flags for the entry data 930 * @param blockSize to use for space accounting 931 * @throws IOException if the file can't be moved 932 */ EntryFile(File temp, File dir, String tag,long timestampMillis, int flags, int blockSize)933 public EntryFile(File temp, File dir, String tag,long timestampMillis, 934 int flags, int blockSize) throws IOException { 935 if ((flags & DropBoxManager.IS_EMPTY) != 0) throw new IllegalArgumentException(); 936 937 this.tag = TextUtils.safeIntern(tag); 938 this.timestampMillis = timestampMillis; 939 this.flags = flags; 940 941 final File file = this.getFile(dir); 942 if (!temp.renameTo(file)) { 943 throw new IOException("Can't rename " + temp + " to " + file); 944 } 945 this.blocks = (int) ((file.length() + blockSize - 1) / blockSize); 946 } 947 948 /** 949 * Creates a zero-length tombstone for a file whose contents were lost. 950 * 951 * @param dir to store file in 952 * @param tag to use for new log file name 953 * @param timestampMillis of log entry 954 * @throws IOException if the file can't be created. 955 */ EntryFile(File dir, String tag, long timestampMillis)956 public EntryFile(File dir, String tag, long timestampMillis) throws IOException { 957 this.tag = TextUtils.safeIntern(tag); 958 this.timestampMillis = timestampMillis; 959 this.flags = DropBoxManager.IS_EMPTY; 960 this.blocks = 0; 961 new FileOutputStream(getFile(dir)).close(); 962 } 963 964 /** 965 * Extracts metadata from an existing on-disk log filename. 966 * 967 * Note when a filename is not recognizable, it will create an instance that 968 * {@link #hasFile()} would return false on, and also remove the file. 969 * 970 * @param file name of existing log file 971 * @param blockSize to use for space accounting 972 */ EntryFile(File file, int blockSize)973 public EntryFile(File file, int blockSize) { 974 975 boolean parseFailure = false; 976 977 String name = file.getName(); 978 int flags = 0; 979 String tag = null; 980 long millis = 0; 981 982 final int at = name.lastIndexOf('@'); 983 if (at < 0) { 984 parseFailure = true; 985 } else { 986 tag = Uri.decode(name.substring(0, at)); 987 if (name.endsWith(".gz")) { 988 flags |= DropBoxManager.IS_GZIPPED; 989 name = name.substring(0, name.length() - 3); 990 } 991 if (name.endsWith(".lost")) { 992 flags |= DropBoxManager.IS_EMPTY; 993 name = name.substring(at + 1, name.length() - 5); 994 } else if (name.endsWith(".txt")) { 995 flags |= DropBoxManager.IS_TEXT; 996 name = name.substring(at + 1, name.length() - 4); 997 } else if (name.endsWith(".dat")) { 998 name = name.substring(at + 1, name.length() - 4); 999 } else { 1000 parseFailure = true; 1001 } 1002 if (!parseFailure) { 1003 try { 1004 millis = Long.parseLong(name); 1005 } catch (NumberFormatException e) { 1006 parseFailure = true; 1007 } 1008 } 1009 } 1010 if (parseFailure) { 1011 Slog.wtf(TAG, "Invalid filename: " + file); 1012 1013 // Remove the file and return an empty instance. 1014 file.delete(); 1015 this.tag = null; 1016 this.flags = DropBoxManager.IS_EMPTY; 1017 this.timestampMillis = 0; 1018 this.blocks = 0; 1019 return; 1020 } 1021 1022 this.blocks = (int) ((file.length() + blockSize - 1) / blockSize); 1023 this.tag = TextUtils.safeIntern(tag); 1024 this.flags = flags; 1025 this.timestampMillis = millis; 1026 } 1027 1028 /** 1029 * Creates a EntryFile object with only a timestamp for comparison purposes. 1030 * @param millis to compare with. 1031 */ EntryFile(long millis)1032 public EntryFile(long millis) { 1033 this.tag = null; 1034 this.timestampMillis = millis; 1035 this.flags = DropBoxManager.IS_EMPTY; 1036 this.blocks = 0; 1037 } 1038 1039 /** 1040 * @return whether an entry actually has a backing file, or it's an empty "tombstone" 1041 * entry. 1042 */ hasFile()1043 public boolean hasFile() { 1044 return tag != null; 1045 } 1046 1047 /** @return File extension for the flags. */ getExtension()1048 private String getExtension() { 1049 if ((flags & DropBoxManager.IS_EMPTY) != 0) { 1050 return ".lost"; 1051 } 1052 return ((flags & DropBoxManager.IS_TEXT) != 0 ? ".txt" : ".dat") + 1053 ((flags & DropBoxManager.IS_GZIPPED) != 0 ? ".gz" : ""); 1054 } 1055 1056 /** 1057 * @return filename for this entry without the pathname. 1058 */ getFilename()1059 public String getFilename() { 1060 return hasFile() ? Uri.encode(tag) + "@" + timestampMillis + getExtension() : null; 1061 } 1062 1063 /** 1064 * Get a full-path {@link File} representing this entry. 1065 * @param dir Parent directly. The caller needs to pass it because {@link EntryFile}s don't 1066 * know in which directory they're stored. 1067 */ getFile(File dir)1068 public File getFile(File dir) { 1069 return hasFile() ? new File(dir, getFilename()) : null; 1070 } 1071 1072 /** 1073 * If an entry has a backing file, remove it. 1074 */ deleteFile(File dir)1075 public void deleteFile(File dir) { 1076 if (hasFile()) { 1077 getFile(dir).delete(); 1078 } 1079 } 1080 } 1081 1082 /////////////////////////////////////////////////////////////////////////// 1083 1084 /** If never run before, scans disk contents to build in-memory tracking data. */ init()1085 private synchronized void init() throws IOException { 1086 if (mStatFs == null) { 1087 if (!mDropBoxDir.isDirectory() && !mDropBoxDir.mkdirs()) { 1088 throw new IOException("Can't mkdir: " + mDropBoxDir); 1089 } 1090 try { 1091 mStatFs = new StatFs(mDropBoxDir.getPath()); 1092 mBlockSize = mStatFs.getBlockSize(); 1093 } catch (IllegalArgumentException e) { // StatFs throws this on error 1094 throw new IOException("Can't statfs: " + mDropBoxDir); 1095 } 1096 } 1097 1098 if (mAllFiles == null) { 1099 File[] files = mDropBoxDir.listFiles(); 1100 if (files == null) throw new IOException("Can't list files: " + mDropBoxDir); 1101 1102 mAllFiles = new FileList(); 1103 mFilesByTag = new ArrayMap<>(); 1104 1105 // Scan pre-existing files. 1106 for (File file : files) { 1107 if (file.getName().endsWith(".tmp")) { 1108 Slog.i(TAG, "Cleaning temp file: " + file); 1109 file.delete(); 1110 continue; 1111 } 1112 1113 EntryFile entry = new EntryFile(file, mBlockSize); 1114 1115 if (entry.hasFile()) { 1116 // Enroll only when the filename is valid. Otherwise the above constructor 1117 // has removed the file already. 1118 enrollEntry(entry); 1119 } 1120 } 1121 } 1122 } 1123 1124 /** Adds a disk log file to in-memory tracking for accounting and enumeration. */ enrollEntry(EntryFile entry)1125 private synchronized void enrollEntry(EntryFile entry) { 1126 mAllFiles.contents.add(entry); 1127 mAllFiles.blocks += entry.blocks; 1128 1129 // mFilesByTag is used for trimming, so don't list empty files. 1130 // (Zero-length/lost files are trimmed by date from mAllFiles.) 1131 1132 if (entry.hasFile() && entry.blocks > 0) { 1133 FileList tagFiles = mFilesByTag.get(entry.tag); 1134 if (tagFiles == null) { 1135 tagFiles = new FileList(); 1136 mFilesByTag.put(TextUtils.safeIntern(entry.tag), tagFiles); 1137 } 1138 tagFiles.contents.add(entry); 1139 tagFiles.blocks += entry.blocks; 1140 } 1141 } 1142 1143 /** Moves a temporary file to a final log filename and enrolls it. */ createEntry(File temp, String tag, int flags)1144 private synchronized long createEntry(File temp, String tag, int flags) throws IOException { 1145 long t = System.currentTimeMillis(); 1146 1147 // Require each entry to have a unique timestamp; if there are entries 1148 // >10sec in the future (due to clock skew), drag them back to avoid 1149 // keeping them around forever. 1150 1151 SortedSet<EntryFile> tail = mAllFiles.contents.tailSet(new EntryFile(t + 10000)); 1152 EntryFile[] future = null; 1153 if (!tail.isEmpty()) { 1154 future = tail.toArray(new EntryFile[tail.size()]); 1155 tail.clear(); // Remove from mAllFiles 1156 } 1157 1158 if (!mAllFiles.contents.isEmpty()) { 1159 t = Math.max(t, mAllFiles.contents.last().timestampMillis + 1); 1160 } 1161 1162 if (future != null) { 1163 for (EntryFile late : future) { 1164 mAllFiles.blocks -= late.blocks; 1165 FileList tagFiles = mFilesByTag.get(late.tag); 1166 if (tagFiles != null && tagFiles.contents.remove(late)) { 1167 tagFiles.blocks -= late.blocks; 1168 } 1169 if ((late.flags & DropBoxManager.IS_EMPTY) == 0) { 1170 enrollEntry(new EntryFile(late.getFile(mDropBoxDir), mDropBoxDir, 1171 late.tag, t++, late.flags, mBlockSize)); 1172 } else { 1173 enrollEntry(new EntryFile(mDropBoxDir, late.tag, t++)); 1174 } 1175 } 1176 } 1177 1178 if (temp == null) { 1179 enrollEntry(new EntryFile(mDropBoxDir, tag, t)); 1180 } else { 1181 enrollEntry(new EntryFile(temp, mDropBoxDir, tag, t, flags, mBlockSize)); 1182 } 1183 return t; 1184 } 1185 1186 /** 1187 * Trims the files on disk to make sure they aren't using too much space. 1188 * @return the overall quota for storage (in bytes) 1189 */ trimToFit()1190 private synchronized long trimToFit() throws IOException { 1191 // Expunge aged items (including tombstones marking deleted data). 1192 1193 int ageSeconds = Settings.Global.getInt(mContentResolver, 1194 Settings.Global.DROPBOX_AGE_SECONDS, DEFAULT_AGE_SECONDS); 1195 mMaxFiles = Settings.Global.getInt(mContentResolver, 1196 Settings.Global.DROPBOX_MAX_FILES, 1197 (ActivityManager.isLowRamDeviceStatic() 1198 ? DEFAULT_MAX_FILES_LOWRAM : DEFAULT_MAX_FILES)); 1199 long curTimeMillis = System.currentTimeMillis(); 1200 long cutoffMillis = curTimeMillis - ageSeconds * 1000; 1201 while (!mAllFiles.contents.isEmpty()) { 1202 EntryFile entry = mAllFiles.contents.first(); 1203 if (entry.timestampMillis > cutoffMillis && mAllFiles.contents.size() < mMaxFiles) { 1204 break; 1205 } 1206 1207 logDropboxDropped( 1208 FrameworkStatsLog.DROPBOX_ENTRY_DROPPED__DROP_REASON__AGED, 1209 entry.tag, 1210 curTimeMillis - entry.timestampMillis); 1211 1212 FileList tag = mFilesByTag.get(entry.tag); 1213 if (tag != null && tag.contents.remove(entry)) tag.blocks -= entry.blocks; 1214 if (mAllFiles.contents.remove(entry)) mAllFiles.blocks -= entry.blocks; 1215 entry.deleteFile(mDropBoxDir); 1216 } 1217 1218 // Compute overall quota (a fraction of available free space) in blocks. 1219 // The quota changes dynamically based on the amount of free space; 1220 // that way when lots of data is available we can use it, but we'll get 1221 // out of the way if storage starts getting tight. 1222 1223 long uptimeMillis = SystemClock.uptimeMillis(); 1224 if (uptimeMillis > mCachedQuotaUptimeMillis + QUOTA_RESCAN_MILLIS) { 1225 int quotaPercent = Settings.Global.getInt(mContentResolver, 1226 Settings.Global.DROPBOX_QUOTA_PERCENT, DEFAULT_QUOTA_PERCENT); 1227 int reservePercent = Settings.Global.getInt(mContentResolver, 1228 Settings.Global.DROPBOX_RESERVE_PERCENT, DEFAULT_RESERVE_PERCENT); 1229 int quotaKb = Settings.Global.getInt(mContentResolver, 1230 Settings.Global.DROPBOX_QUOTA_KB, DEFAULT_QUOTA_KB); 1231 1232 String dirPath = mDropBoxDir.getPath(); 1233 try { 1234 mStatFs.restat(dirPath); 1235 } catch (IllegalArgumentException e) { // restat throws this on error 1236 throw new IOException("Can't restat: " + mDropBoxDir); 1237 } 1238 long available = mStatFs.getAvailableBlocksLong(); 1239 long nonreserved = available - mStatFs.getBlockCountLong() * reservePercent / 100; 1240 long maxAvailableLong = nonreserved * quotaPercent / 100; 1241 int maxAvailable = Math.toIntExact(Math.max(0, 1242 Math.min(maxAvailableLong, Integer.MAX_VALUE))); 1243 int maximum = quotaKb * 1024 / mBlockSize; 1244 mCachedQuotaBlocks = Math.min(maximum, maxAvailable); 1245 mCachedQuotaUptimeMillis = uptimeMillis; 1246 } 1247 1248 // If we're using too much space, delete old items to make room. 1249 // 1250 // We trim each tag independently (this is why we keep per-tag lists). 1251 // Space is "fairly" shared between tags -- they are all squeezed 1252 // equally until enough space is reclaimed. 1253 // 1254 // A single circular buffer (a la logcat) would be simpler, but this 1255 // way we can handle fat/bursty data (like 1MB+ bugreports, 300KB+ 1256 // kernel crash dumps, and 100KB+ ANR reports) without swamping small, 1257 // well-behaved data streams (event statistics, profile data, etc). 1258 // 1259 // Deleted files are replaced with zero-length tombstones to mark what 1260 // was lost. Tombstones are expunged by age (see above). 1261 1262 if (mAllFiles.blocks > mCachedQuotaBlocks) { 1263 // Find a fair share amount of space to limit each tag 1264 int unsqueezed = mAllFiles.blocks, squeezed = 0; 1265 TreeSet<FileList> tags = new TreeSet<FileList>(mFilesByTag.values()); 1266 for (FileList tag : tags) { 1267 if (squeezed > 0 && tag.blocks <= (mCachedQuotaBlocks - unsqueezed) / squeezed) { 1268 break; 1269 } 1270 unsqueezed -= tag.blocks; 1271 squeezed++; 1272 } 1273 int tagQuota = (mCachedQuotaBlocks - unsqueezed) / squeezed; 1274 1275 // Remove old items from each tag until it meets the per-tag quota. 1276 for (FileList tag : tags) { 1277 if (mAllFiles.blocks < mCachedQuotaBlocks) break; 1278 while (tag.blocks > tagQuota && !tag.contents.isEmpty()) { 1279 EntryFile entry = tag.contents.first(); 1280 logDropboxDropped( 1281 FrameworkStatsLog.DROPBOX_ENTRY_DROPPED__DROP_REASON__CLEARING_DATA, 1282 entry.tag, 1283 curTimeMillis - entry.timestampMillis); 1284 1285 if (tag.contents.remove(entry)) tag.blocks -= entry.blocks; 1286 if (mAllFiles.contents.remove(entry)) mAllFiles.blocks -= entry.blocks; 1287 1288 try { 1289 entry.deleteFile(mDropBoxDir); 1290 enrollEntry(new EntryFile(mDropBoxDir, entry.tag, entry.timestampMillis)); 1291 } catch (IOException e) { 1292 Slog.e(TAG, "Can't write tombstone file", e); 1293 } 1294 } 1295 } 1296 } 1297 1298 return mCachedQuotaBlocks * mBlockSize; 1299 } 1300 getLowPriorityResourceConfigs()1301 private void getLowPriorityResourceConfigs() { 1302 mLowPriorityRateLimitPeriod = Resources.getSystem().getInteger( 1303 R.integer.config_dropboxLowPriorityBroadcastRateLimitPeriod); 1304 1305 final String[] lowPrioritytags = Resources.getSystem().getStringArray( 1306 R.array.config_dropboxLowPriorityTags); 1307 final int size = lowPrioritytags.length; 1308 if (size == 0) { 1309 mLowPriorityTags = null; 1310 return; 1311 } 1312 mLowPriorityTags = new ArraySet(size); 1313 for (int i = 0; i < size; i++) { 1314 mLowPriorityTags.add(lowPrioritytags[i]); 1315 } 1316 } 1317 1318 private final class DropBoxManagerInternalImpl extends DropBoxManagerInternal { 1319 @Override addEntry(String tag, EntrySource entry, int flags)1320 public void addEntry(String tag, EntrySource entry, int flags) { 1321 DropBoxManagerService.this.addEntry(tag, entry, flags); 1322 } 1323 } 1324 } 1325