StorageManager.java revision 620b32b316fd4f1bab4eef55ec8802d14a55e7dd
1/* 2 * Copyright (C) 2008 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 17package android.os.storage; 18 19import static android.net.TrafficStats.MB_IN_BYTES; 20 21import android.annotation.NonNull; 22import android.annotation.Nullable; 23import android.content.ContentResolver; 24import android.content.Context; 25import android.os.Environment; 26import android.os.FileUtils; 27import android.os.Handler; 28import android.os.Looper; 29import android.os.Message; 30import android.os.RemoteException; 31import android.os.ServiceManager; 32import android.provider.Settings; 33import android.text.TextUtils; 34import android.util.Log; 35import android.util.SparseArray; 36 37import com.android.internal.os.SomeArgs; 38import com.android.internal.util.Preconditions; 39 40import java.io.File; 41import java.io.IOException; 42import java.lang.ref.WeakReference; 43import java.util.ArrayList; 44import java.util.Arrays; 45import java.util.Iterator; 46import java.util.List; 47import java.util.Objects; 48import java.util.concurrent.atomic.AtomicInteger; 49 50/** 51 * StorageManager is the interface to the systems storage service. The storage 52 * manager handles storage-related items such as Opaque Binary Blobs (OBBs). 53 * <p> 54 * OBBs contain a filesystem that maybe be encrypted on disk and mounted 55 * on-demand from an application. OBBs are a good way of providing large amounts 56 * of binary assets without packaging them into APKs as they may be multiple 57 * gigabytes in size. However, due to their size, they're most likely stored in 58 * a shared storage pool accessible from all programs. The system does not 59 * guarantee the security of the OBB file itself: if any program modifies the 60 * OBB, there is no guarantee that a read from that OBB will produce the 61 * expected output. 62 * <p> 63 * Get an instance of this class by calling 64 * {@link android.content.Context#getSystemService(java.lang.String)} with an 65 * argument of {@link android.content.Context#STORAGE_SERVICE}. 66 */ 67public class StorageManager { 68 private static final String TAG = "StorageManager"; 69 70 /** {@hide} */ 71 public static final String PROP_PRIMARY_PHYSICAL = "ro.vold.primary_physical"; 72 /** {@hide} */ 73 public static final String PROP_FORCE_ADOPTABLE = "persist.fw.force_adoptable"; 74 75 /** {@hide} */ 76 public static final String UUID_PRIVATE_INTERNAL = null; 77 /** {@hide} */ 78 public static final String UUID_PRIMARY_PHYSICAL = "primary_physical"; 79 80 /** {@hide} */ 81 public static final int FLAG_ALL_METADATA = 1 << 0; 82 83 private final Context mContext; 84 private final ContentResolver mResolver; 85 86 private final IMountService mMountService; 87 private final Looper mLooper; 88 private final AtomicInteger mNextNonce = new AtomicInteger(0); 89 90 private final ArrayList<StorageEventListenerDelegate> mDelegates = new ArrayList<>(); 91 92 private static class StorageEventListenerDelegate extends IMountServiceListener.Stub implements 93 Handler.Callback { 94 private static final int MSG_STORAGE_STATE_CHANGED = 1; 95 private static final int MSG_VOLUME_STATE_CHANGED = 2; 96 private static final int MSG_VOLUME_METADATA_CHANGED = 3; 97 private static final int MSG_DISK_SCANNED = 4; 98 99 final StorageEventListener mCallback; 100 final Handler mHandler; 101 102 public StorageEventListenerDelegate(StorageEventListener callback, Looper looper) { 103 mCallback = callback; 104 mHandler = new Handler(looper, this); 105 } 106 107 @Override 108 public boolean handleMessage(Message msg) { 109 final SomeArgs args = (SomeArgs) msg.obj; 110 switch (msg.what) { 111 case MSG_STORAGE_STATE_CHANGED: 112 mCallback.onStorageStateChanged((String) args.arg1, (String) args.arg2, 113 (String) args.arg3); 114 args.recycle(); 115 return true; 116 case MSG_VOLUME_STATE_CHANGED: 117 mCallback.onVolumeStateChanged((VolumeInfo) args.arg1, args.argi2, args.argi3); 118 args.recycle(); 119 return true; 120 case MSG_VOLUME_METADATA_CHANGED: 121 mCallback.onVolumeMetadataChanged((VolumeInfo) args.arg1); 122 args.recycle(); 123 return true; 124 case MSG_DISK_SCANNED: 125 mCallback.onDiskScanned((DiskInfo) args.arg1, args.argi2); 126 args.recycle(); 127 return true; 128 } 129 args.recycle(); 130 return false; 131 } 132 133 @Override 134 public void onUsbMassStorageConnectionChanged(boolean connected) throws RemoteException { 135 // Ignored 136 } 137 138 @Override 139 public void onStorageStateChanged(String path, String oldState, String newState) { 140 final SomeArgs args = SomeArgs.obtain(); 141 args.arg1 = path; 142 args.arg2 = oldState; 143 args.arg3 = newState; 144 mHandler.obtainMessage(MSG_STORAGE_STATE_CHANGED, args).sendToTarget(); 145 } 146 147 @Override 148 public void onVolumeStateChanged(VolumeInfo vol, int oldState, int newState) { 149 final SomeArgs args = SomeArgs.obtain(); 150 args.arg1 = vol; 151 args.argi2 = oldState; 152 args.argi3 = newState; 153 mHandler.obtainMessage(MSG_VOLUME_STATE_CHANGED, args).sendToTarget(); 154 } 155 156 @Override 157 public void onVolumeMetadataChanged(VolumeInfo vol) { 158 final SomeArgs args = SomeArgs.obtain(); 159 args.arg1 = vol; 160 mHandler.obtainMessage(MSG_VOLUME_METADATA_CHANGED, args).sendToTarget(); 161 } 162 163 @Override 164 public void onDiskScanned(DiskInfo disk, int volumeCount) { 165 final SomeArgs args = SomeArgs.obtain(); 166 args.arg1 = disk; 167 args.argi2 = volumeCount; 168 mHandler.obtainMessage(MSG_DISK_SCANNED, args).sendToTarget(); 169 } 170 } 171 172 /** 173 * Binder listener for OBB action results. 174 */ 175 private final ObbActionListener mObbActionListener = new ObbActionListener(); 176 177 private class ObbActionListener extends IObbActionListener.Stub { 178 @SuppressWarnings("hiding") 179 private SparseArray<ObbListenerDelegate> mListeners = new SparseArray<ObbListenerDelegate>(); 180 181 @Override 182 public void onObbResult(String filename, int nonce, int status) { 183 final ObbListenerDelegate delegate; 184 synchronized (mListeners) { 185 delegate = mListeners.get(nonce); 186 if (delegate != null) { 187 mListeners.remove(nonce); 188 } 189 } 190 191 if (delegate != null) { 192 delegate.sendObbStateChanged(filename, status); 193 } 194 } 195 196 public int addListener(OnObbStateChangeListener listener) { 197 final ObbListenerDelegate delegate = new ObbListenerDelegate(listener); 198 199 synchronized (mListeners) { 200 mListeners.put(delegate.nonce, delegate); 201 } 202 203 return delegate.nonce; 204 } 205 } 206 207 private int getNextNonce() { 208 return mNextNonce.getAndIncrement(); 209 } 210 211 /** 212 * Private class containing sender and receiver code for StorageEvents. 213 */ 214 private class ObbListenerDelegate { 215 private final WeakReference<OnObbStateChangeListener> mObbEventListenerRef; 216 private final Handler mHandler; 217 218 private final int nonce; 219 220 ObbListenerDelegate(OnObbStateChangeListener listener) { 221 nonce = getNextNonce(); 222 mObbEventListenerRef = new WeakReference<OnObbStateChangeListener>(listener); 223 mHandler = new Handler(mLooper) { 224 @Override 225 public void handleMessage(Message msg) { 226 final OnObbStateChangeListener changeListener = getListener(); 227 if (changeListener == null) { 228 return; 229 } 230 231 changeListener.onObbStateChange((String) msg.obj, msg.arg1); 232 } 233 }; 234 } 235 236 OnObbStateChangeListener getListener() { 237 if (mObbEventListenerRef == null) { 238 return null; 239 } 240 return mObbEventListenerRef.get(); 241 } 242 243 void sendObbStateChanged(String path, int state) { 244 mHandler.obtainMessage(0, state, 0, path).sendToTarget(); 245 } 246 } 247 248 /** {@hide} */ 249 public static StorageManager from(Context context) { 250 return (StorageManager) context.getSystemService(Context.STORAGE_SERVICE); 251 } 252 253 /** 254 * Constructs a StorageManager object through which an application can 255 * can communicate with the systems mount service. 256 * 257 * @param tgtLooper The {@link android.os.Looper} which events will be received on. 258 * 259 * <p>Applications can get instance of this class by calling 260 * {@link android.content.Context#getSystemService(java.lang.String)} with an argument 261 * of {@link android.content.Context#STORAGE_SERVICE}. 262 * 263 * @hide 264 */ 265 public StorageManager(Context context, Looper looper) { 266 mContext = context; 267 mResolver = context.getContentResolver(); 268 mLooper = looper; 269 mMountService = IMountService.Stub.asInterface(ServiceManager.getService("mount")); 270 if (mMountService == null) { 271 throw new IllegalStateException("Failed to find running mount service"); 272 } 273 } 274 275 /** 276 * Registers a {@link android.os.storage.StorageEventListener StorageEventListener}. 277 * 278 * @param listener A {@link android.os.storage.StorageEventListener StorageEventListener} object. 279 * 280 * @hide 281 */ 282 public void registerListener(StorageEventListener listener) { 283 synchronized (mDelegates) { 284 final StorageEventListenerDelegate delegate = new StorageEventListenerDelegate(listener, 285 mLooper); 286 try { 287 mMountService.registerListener(delegate); 288 } catch (RemoteException e) { 289 throw e.rethrowAsRuntimeException(); 290 } 291 mDelegates.add(delegate); 292 } 293 } 294 295 /** 296 * Unregisters a {@link android.os.storage.StorageEventListener StorageEventListener}. 297 * 298 * @param listener A {@link android.os.storage.StorageEventListener StorageEventListener} object. 299 * 300 * @hide 301 */ 302 public void unregisterListener(StorageEventListener listener) { 303 synchronized (mDelegates) { 304 for (Iterator<StorageEventListenerDelegate> i = mDelegates.iterator(); i.hasNext();) { 305 final StorageEventListenerDelegate delegate = i.next(); 306 if (delegate.mCallback == listener) { 307 try { 308 mMountService.unregisterListener(delegate); 309 } catch (RemoteException e) { 310 throw e.rethrowAsRuntimeException(); 311 } 312 i.remove(); 313 } 314 } 315 } 316 } 317 318 /** 319 * Enables USB Mass Storage (UMS) on the device. 320 * 321 * @hide 322 */ 323 @Deprecated 324 public void enableUsbMassStorage() { 325 } 326 327 /** 328 * Disables USB Mass Storage (UMS) on the device. 329 * 330 * @hide 331 */ 332 @Deprecated 333 public void disableUsbMassStorage() { 334 } 335 336 /** 337 * Query if a USB Mass Storage (UMS) host is connected. 338 * @return true if UMS host is connected. 339 * 340 * @hide 341 */ 342 @Deprecated 343 public boolean isUsbMassStorageConnected() { 344 return false; 345 } 346 347 /** 348 * Query if a USB Mass Storage (UMS) is enabled on the device. 349 * @return true if UMS host is enabled. 350 * 351 * @hide 352 */ 353 @Deprecated 354 public boolean isUsbMassStorageEnabled() { 355 return false; 356 } 357 358 /** 359 * Mount an Opaque Binary Blob (OBB) file. If a <code>key</code> is 360 * specified, it is supplied to the mounting process to be used in any 361 * encryption used in the OBB. 362 * <p> 363 * The OBB will remain mounted for as long as the StorageManager reference 364 * is held by the application. As soon as this reference is lost, the OBBs 365 * in use will be unmounted. The {@link OnObbStateChangeListener} registered 366 * with this call will receive the success or failure of this operation. 367 * <p> 368 * <em>Note:</em> you can only mount OBB files for which the OBB tag on the 369 * file matches a package ID that is owned by the calling program's UID. 370 * That is, shared UID applications can attempt to mount any other 371 * application's OBB that shares its UID. 372 * 373 * @param rawPath the path to the OBB file 374 * @param key secret used to encrypt the OBB; may be <code>null</code> if no 375 * encryption was used on the OBB. 376 * @param listener will receive the success or failure of the operation 377 * @return whether the mount call was successfully queued or not 378 */ 379 public boolean mountObb(String rawPath, String key, OnObbStateChangeListener listener) { 380 Preconditions.checkNotNull(rawPath, "rawPath cannot be null"); 381 Preconditions.checkNotNull(listener, "listener cannot be null"); 382 383 try { 384 final String canonicalPath = new File(rawPath).getCanonicalPath(); 385 final int nonce = mObbActionListener.addListener(listener); 386 mMountService.mountObb(rawPath, canonicalPath, key, mObbActionListener, nonce); 387 return true; 388 } catch (IOException e) { 389 throw new IllegalArgumentException("Failed to resolve path: " + rawPath, e); 390 } catch (RemoteException e) { 391 Log.e(TAG, "Failed to mount OBB", e); 392 } 393 394 return false; 395 } 396 397 /** 398 * Unmount an Opaque Binary Blob (OBB) file asynchronously. If the 399 * <code>force</code> flag is true, it will kill any application needed to 400 * unmount the given OBB (even the calling application). 401 * <p> 402 * The {@link OnObbStateChangeListener} registered with this call will 403 * receive the success or failure of this operation. 404 * <p> 405 * <em>Note:</em> you can only mount OBB files for which the OBB tag on the 406 * file matches a package ID that is owned by the calling program's UID. 407 * That is, shared UID applications can obtain access to any other 408 * application's OBB that shares its UID. 409 * <p> 410 * 411 * @param rawPath path to the OBB file 412 * @param force whether to kill any programs using this in order to unmount 413 * it 414 * @param listener will receive the success or failure of the operation 415 * @return whether the unmount call was successfully queued or not 416 */ 417 public boolean unmountObb(String rawPath, boolean force, OnObbStateChangeListener listener) { 418 Preconditions.checkNotNull(rawPath, "rawPath cannot be null"); 419 Preconditions.checkNotNull(listener, "listener cannot be null"); 420 421 try { 422 final int nonce = mObbActionListener.addListener(listener); 423 mMountService.unmountObb(rawPath, force, mObbActionListener, nonce); 424 return true; 425 } catch (RemoteException e) { 426 Log.e(TAG, "Failed to mount OBB", e); 427 } 428 429 return false; 430 } 431 432 /** 433 * Check whether an Opaque Binary Blob (OBB) is mounted or not. 434 * 435 * @param rawPath path to OBB image 436 * @return true if OBB is mounted; false if not mounted or on error 437 */ 438 public boolean isObbMounted(String rawPath) { 439 Preconditions.checkNotNull(rawPath, "rawPath cannot be null"); 440 441 try { 442 return mMountService.isObbMounted(rawPath); 443 } catch (RemoteException e) { 444 Log.e(TAG, "Failed to check if OBB is mounted", e); 445 } 446 447 return false; 448 } 449 450 /** 451 * Check the mounted path of an Opaque Binary Blob (OBB) file. This will 452 * give you the path to where you can obtain access to the internals of the 453 * OBB. 454 * 455 * @param rawPath path to OBB image 456 * @return absolute path to mounted OBB image data or <code>null</code> if 457 * not mounted or exception encountered trying to read status 458 */ 459 public String getMountedObbPath(String rawPath) { 460 Preconditions.checkNotNull(rawPath, "rawPath cannot be null"); 461 462 try { 463 return mMountService.getMountedObbPath(rawPath); 464 } catch (RemoteException e) { 465 Log.e(TAG, "Failed to find mounted path for OBB", e); 466 } 467 468 return null; 469 } 470 471 /** {@hide} */ 472 public @NonNull List<DiskInfo> getDisks() { 473 try { 474 return Arrays.asList(mMountService.getDisks()); 475 } catch (RemoteException e) { 476 throw e.rethrowAsRuntimeException(); 477 } 478 } 479 480 /** {@hide} */ 481 public @Nullable DiskInfo findDiskById(String id) { 482 Preconditions.checkNotNull(id); 483 // TODO; go directly to service to make this faster 484 for (DiskInfo disk : getDisks()) { 485 if (Objects.equals(disk.id, id)) { 486 return disk; 487 } 488 } 489 return null; 490 } 491 492 /** {@hide} */ 493 public @Nullable VolumeInfo findVolumeById(String id) { 494 Preconditions.checkNotNull(id); 495 // TODO; go directly to service to make this faster 496 for (VolumeInfo vol : getVolumes()) { 497 if (Objects.equals(vol.id, id)) { 498 return vol; 499 } 500 } 501 return null; 502 } 503 504 /** {@hide} */ 505 public @Nullable VolumeInfo findVolumeByUuid(String fsUuid) { 506 Preconditions.checkNotNull(fsUuid); 507 // TODO; go directly to service to make this faster 508 for (VolumeInfo vol : getVolumes()) { 509 if (Objects.equals(vol.fsUuid, fsUuid)) { 510 return vol; 511 } 512 } 513 return null; 514 } 515 516 /** {@hide} */ 517 public @Nullable VolumeInfo findPrivateForEmulated(VolumeInfo emulatedVol) { 518 return findVolumeById(emulatedVol.getId().replace("emulated", "private")); 519 } 520 521 /** {@hide} */ 522 public @Nullable VolumeInfo findEmulatedForPrivate(VolumeInfo privateVol) { 523 return findVolumeById(privateVol.getId().replace("private", "emulated")); 524 } 525 526 /** {@hide} */ 527 public @NonNull List<VolumeInfo> getVolumes() { 528 return getVolumes(0); 529 } 530 531 /** {@hide} */ 532 public @NonNull List<VolumeInfo> getVolumes(int flags) { 533 try { 534 return Arrays.asList(mMountService.getVolumes(flags)); 535 } catch (RemoteException e) { 536 throw e.rethrowAsRuntimeException(); 537 } 538 } 539 540 /** {@hide} */ 541 public @Nullable String getBestVolumeDescription(VolumeInfo vol) { 542 String descrip = vol.getDescription(); 543 if (vol.disk != null) { 544 if (TextUtils.isEmpty(descrip)) { 545 descrip = vol.disk.getDescription(); 546 } 547 } 548 return descrip; 549 } 550 551 /** {@hide} */ 552 public @Nullable VolumeInfo getPrimaryPhysicalVolume() { 553 final List<VolumeInfo> vols = getVolumes(); 554 for (VolumeInfo vol : vols) { 555 if (vol.isPrimaryPhysical()) { 556 return vol; 557 } 558 } 559 return null; 560 } 561 562 /** {@hide} */ 563 public void mount(String volId) { 564 try { 565 mMountService.mount(volId); 566 } catch (RemoteException e) { 567 throw e.rethrowAsRuntimeException(); 568 } 569 } 570 571 /** {@hide} */ 572 public void unmount(String volId) { 573 try { 574 mMountService.unmount(volId); 575 } catch (RemoteException e) { 576 throw e.rethrowAsRuntimeException(); 577 } 578 } 579 580 /** {@hide} */ 581 public void format(String volId) { 582 try { 583 mMountService.format(volId); 584 } catch (RemoteException e) { 585 throw e.rethrowAsRuntimeException(); 586 } 587 } 588 589 /** {@hide} */ 590 public void partitionPublic(String diskId) { 591 try { 592 mMountService.partitionPublic(diskId); 593 } catch (RemoteException e) { 594 throw e.rethrowAsRuntimeException(); 595 } 596 } 597 598 /** {@hide} */ 599 public void partitionPrivate(String diskId) { 600 try { 601 mMountService.partitionPrivate(diskId); 602 } catch (RemoteException e) { 603 throw e.rethrowAsRuntimeException(); 604 } 605 } 606 607 /** {@hide} */ 608 public void partitionMixed(String diskId, int ratio) { 609 try { 610 mMountService.partitionMixed(diskId, ratio); 611 } catch (RemoteException e) { 612 throw e.rethrowAsRuntimeException(); 613 } 614 } 615 616 /** {@hide} */ 617 public void setVolumeNickname(String volId, String nickname) { 618 try { 619 mMountService.setVolumeNickname(volId, nickname); 620 } catch (RemoteException e) { 621 throw e.rethrowAsRuntimeException(); 622 } 623 } 624 625 /** {@hide} */ 626 public void setVolumeInited(String volId, boolean inited) { 627 try { 628 mMountService.setVolumeUserFlags(volId, inited ? VolumeInfo.USER_FLAG_INITED : 0, 629 VolumeInfo.USER_FLAG_INITED); 630 } catch (RemoteException e) { 631 throw e.rethrowAsRuntimeException(); 632 } 633 } 634 635 /** {@hide} */ 636 public void setVolumeSnoozed(String volId, boolean snoozed) { 637 try { 638 mMountService.setVolumeUserFlags(volId, snoozed ? VolumeInfo.USER_FLAG_SNOOZED : 0, 639 VolumeInfo.USER_FLAG_SNOOZED); 640 } catch (RemoteException e) { 641 throw e.rethrowAsRuntimeException(); 642 } 643 } 644 645 /** {@hide} */ 646 public String getPrimaryStorageUuid() { 647 try { 648 return mMountService.getPrimaryStorageUuid(); 649 } catch (RemoteException e) { 650 throw e.rethrowAsRuntimeException(); 651 } 652 } 653 654 /** {@hide} */ 655 public void setPrimaryStorageUuid(String volumeUuid) { 656 try { 657 mMountService.setPrimaryStorageUuid(volumeUuid); 658 } catch (RemoteException e) { 659 throw e.rethrowAsRuntimeException(); 660 } 661 } 662 663 /** {@hide} */ 664 public @Nullable StorageVolume getStorageVolume(File file) { 665 return getStorageVolume(getVolumeList(), file); 666 } 667 668 /** {@hide} */ 669 public static @Nullable StorageVolume getStorageVolume(File file, int userId) { 670 return getStorageVolume(getVolumeList(userId), file); 671 } 672 673 /** {@hide} */ 674 private static @Nullable StorageVolume getStorageVolume(StorageVolume[] volumes, File file) { 675 File canonicalFile = null; 676 try { 677 canonicalFile = file.getCanonicalFile(); 678 } catch (IOException ignored) { 679 canonicalFile = null; 680 } 681 for (StorageVolume volume : volumes) { 682 if (volume.getPathFile().equals(file)) { 683 return volume; 684 } 685 if (FileUtils.contains(volume.getPathFile(), canonicalFile)) { 686 return volume; 687 } 688 } 689 return null; 690 } 691 692 /** 693 * Gets the state of a volume via its mountpoint. 694 * @hide 695 */ 696 @Deprecated 697 public @NonNull String getVolumeState(String mountPoint) { 698 final StorageVolume vol = getStorageVolume(new File(mountPoint)); 699 if (vol != null) { 700 return vol.getState(); 701 } else { 702 return Environment.MEDIA_UNKNOWN; 703 } 704 } 705 706 /** {@hide} */ 707 public @NonNull StorageVolume[] getVolumeList() { 708 return getVolumeList(mContext.getUserId()); 709 } 710 711 /** {@hide} */ 712 public static @NonNull StorageVolume[] getVolumeList(int userId) { 713 final IMountService mountService = IMountService.Stub.asInterface( 714 ServiceManager.getService("mount")); 715 try { 716 return mountService.getVolumeList(userId); 717 } catch (RemoteException e) { 718 throw e.rethrowAsRuntimeException(); 719 } 720 } 721 722 /** 723 * Returns list of paths for all mountable volumes. 724 * @hide 725 */ 726 @Deprecated 727 public @NonNull String[] getVolumePaths() { 728 StorageVolume[] volumes = getVolumeList(); 729 int count = volumes.length; 730 String[] paths = new String[count]; 731 for (int i = 0; i < count; i++) { 732 paths[i] = volumes[i].getPath(); 733 } 734 return paths; 735 } 736 737 /** {@hide} */ 738 public @NonNull StorageVolume getPrimaryVolume() { 739 return getPrimaryVolume(getVolumeList()); 740 } 741 742 /** {@hide} */ 743 public static @NonNull StorageVolume getPrimaryVolume(StorageVolume[] volumes) { 744 for (StorageVolume volume : volumes) { 745 if (volume.isPrimary()) { 746 return volume; 747 } 748 } 749 throw new IllegalStateException("Missing primary storage"); 750 } 751 752 /** {@hide} */ 753 private static final int DEFAULT_THRESHOLD_PERCENTAGE = 10; 754 private static final long DEFAULT_THRESHOLD_MAX_BYTES = 500 * MB_IN_BYTES; 755 private static final long DEFAULT_FULL_THRESHOLD_BYTES = MB_IN_BYTES; 756 757 /** 758 * Return the number of available bytes until the given path is considered 759 * running low on storage. 760 * 761 * @hide 762 */ 763 public long getStorageBytesUntilLow(File path) { 764 return path.getUsableSpace() - getStorageFullBytes(path); 765 } 766 767 /** 768 * Return the number of available bytes at which the given path is 769 * considered running low on storage. 770 * 771 * @hide 772 */ 773 public long getStorageLowBytes(File path) { 774 final long lowPercent = Settings.Global.getInt(mResolver, 775 Settings.Global.SYS_STORAGE_THRESHOLD_PERCENTAGE, DEFAULT_THRESHOLD_PERCENTAGE); 776 final long lowBytes = (path.getTotalSpace() * lowPercent) / 100; 777 778 final long maxLowBytes = Settings.Global.getLong(mResolver, 779 Settings.Global.SYS_STORAGE_THRESHOLD_MAX_BYTES, DEFAULT_THRESHOLD_MAX_BYTES); 780 781 return Math.min(lowBytes, maxLowBytes); 782 } 783 784 /** 785 * Return the number of available bytes at which the given path is 786 * considered full. 787 * 788 * @hide 789 */ 790 public long getStorageFullBytes(File path) { 791 return Settings.Global.getLong(mResolver, Settings.Global.SYS_STORAGE_FULL_THRESHOLD_BYTES, 792 DEFAULT_FULL_THRESHOLD_BYTES); 793 } 794 795 /// Consts to match the password types in cryptfs.h 796 /** @hide */ 797 public static final int CRYPT_TYPE_PASSWORD = 0; 798 /** @hide */ 799 public static final int CRYPT_TYPE_DEFAULT = 1; 800 /** @hide */ 801 public static final int CRYPT_TYPE_PATTERN = 2; 802 /** @hide */ 803 public static final int CRYPT_TYPE_PIN = 3; 804 805 // Constants for the data available via MountService.getField. 806 /** @hide */ 807 public static final String SYSTEM_LOCALE_KEY = "SystemLocale"; 808 /** @hide */ 809 public static final String OWNER_INFO_KEY = "OwnerInfo"; 810 /** @hide */ 811 public static final String PATTERN_VISIBLE_KEY = "PatternVisible"; 812} 813