Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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.internal.os; |
| 18 | |
| 19 | import android.annotation.NonNull; |
| 20 | import android.annotation.Nullable; |
Artur Satayev | ae5bcf2 | 2019-12-10 17:47:54 +0000 | [diff] [blame] | 21 | import android.compat.annotation.UnsupportedAppUsage; |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 22 | import android.os.Handler; |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 23 | import android.os.Message; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 24 | import android.os.ParcelFileDescriptor; |
Artur Satayev | ae5bcf2 | 2019-12-10 17:47:54 +0000 | [diff] [blame] | 25 | import android.os.ProxyFileDescriptorCallback; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 26 | import android.system.ErrnoException; |
| 27 | import android.system.OsConstants; |
| 28 | import android.util.Log; |
| 29 | import android.util.SparseArray; |
Artur Satayev | ae5bcf2 | 2019-12-10 17:47:54 +0000 | [diff] [blame] | 30 | |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 31 | import com.android.internal.annotations.GuardedBy; |
| 32 | import com.android.internal.util.Preconditions; |
Artur Satayev | ae5bcf2 | 2019-12-10 17:47:54 +0000 | [diff] [blame] | 33 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 34 | import java.util.HashMap; |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 35 | import java.util.LinkedList; |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 36 | import java.util.Map; |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 37 | import java.util.concurrent.ThreadFactory; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 38 | |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 39 | public class FuseAppLoop implements Handler.Callback { |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 40 | private static final String TAG = "FuseAppLoop"; |
| 41 | private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); |
| 42 | public static final int ROOT_INODE = 1; |
| 43 | private static final int MIN_INODE = 2; |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 44 | private static final ThreadFactory sDefaultThreadFactory = new ThreadFactory() { |
| 45 | @Override |
| 46 | public Thread newThread(Runnable r) { |
| 47 | return new Thread(r, TAG); |
| 48 | } |
| 49 | }; |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 50 | private static final int FUSE_OK = 0; |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 51 | private static final int ARGS_POOL_SIZE = 50; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 52 | |
| 53 | private final Object mLock = new Object(); |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 54 | private final int mMountPointId; |
| 55 | private final Thread mThread; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 56 | |
| 57 | @GuardedBy("mLock") |
| 58 | private final SparseArray<CallbackEntry> mCallbackMap = new SparseArray<>(); |
| 59 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 60 | @GuardedBy("mLock") |
| 61 | private final BytesMap mBytesMap = new BytesMap(); |
| 62 | |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 63 | @GuardedBy("mLock") |
| 64 | private final LinkedList<Args> mArgsPool = new LinkedList<>(); |
| 65 | |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 66 | /** |
| 67 | * Sequential number can be used as file name and inode in AppFuse. |
| 68 | * 0 is regarded as an error, 1 is mount point. So we start the number from 2. |
| 69 | */ |
| 70 | @GuardedBy("mLock") |
| 71 | private int mNextInode = MIN_INODE; |
| 72 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 73 | @GuardedBy("mLock") |
| 74 | private long mInstance; |
| 75 | |
| 76 | public FuseAppLoop( |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 77 | int mountPointId, @NonNull ParcelFileDescriptor fd, @Nullable ThreadFactory factory) { |
| 78 | mMountPointId = mountPointId; |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 79 | if (factory == null) { |
| 80 | factory = sDefaultThreadFactory; |
| 81 | } |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 82 | mInstance = native_new(fd.detachFd()); |
| 83 | mThread = factory.newThread(() -> { |
| 84 | native_start(mInstance); |
| 85 | synchronized (mLock) { |
| 86 | native_delete(mInstance); |
| 87 | mInstance = 0; |
| 88 | mBytesMap.clear(); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 89 | } |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 90 | }); |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 91 | mThread.start(); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 92 | } |
| 93 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 94 | public int registerCallback(@NonNull ProxyFileDescriptorCallback callback, |
| 95 | @NonNull Handler handler) throws FuseUnavailableMountException { |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 96 | synchronized (mLock) { |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 97 | Preconditions.checkNotNull(callback); |
| 98 | Preconditions.checkNotNull(handler); |
| 99 | Preconditions.checkState( |
| 100 | mCallbackMap.size() < Integer.MAX_VALUE - MIN_INODE, "Too many opened files."); |
| 101 | Preconditions.checkArgument( |
| 102 | Thread.currentThread().getId() != handler.getLooper().getThread().getId(), |
| 103 | "Handler must be different from the current thread"); |
| 104 | if (mInstance == 0) { |
| 105 | throw new FuseUnavailableMountException(mMountPointId); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 106 | } |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 107 | int id; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 108 | while (true) { |
| 109 | id = mNextInode; |
| 110 | mNextInode++; |
| 111 | if (mNextInode < 0) { |
| 112 | mNextInode = MIN_INODE; |
| 113 | } |
| 114 | if (mCallbackMap.get(id) == null) { |
| 115 | break; |
| 116 | } |
| 117 | } |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 118 | mCallbackMap.put(id, new CallbackEntry( |
| 119 | callback, new Handler(handler.getLooper(), this))); |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 120 | return id; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 121 | } |
| 122 | } |
| 123 | |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 124 | public void unregisterCallback(int id) { |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 125 | synchronized (mLock) { |
| 126 | mCallbackMap.remove(id); |
| 127 | } |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | public int getMountPointId() { |
| 131 | return mMountPointId; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 132 | } |
| 133 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 134 | // Defined in fuse.h |
| 135 | private static final int FUSE_LOOKUP = 1; |
| 136 | private static final int FUSE_GETATTR = 3; |
| 137 | private static final int FUSE_OPEN = 14; |
| 138 | private static final int FUSE_READ = 15; |
| 139 | private static final int FUSE_WRITE = 16; |
| 140 | private static final int FUSE_RELEASE = 18; |
| 141 | private static final int FUSE_FSYNC = 20; |
| 142 | |
| 143 | // Defined in FuseBuffer.h |
Ryo Hashimoto | 5c14d49 | 2018-03-14 19:16:50 +0900 | [diff] [blame] | 144 | private static final int FUSE_MAX_WRITE = 128 * 1024; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 145 | |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 146 | @Override |
| 147 | public boolean handleMessage(Message msg) { |
| 148 | final Args args = (Args) msg.obj; |
| 149 | final CallbackEntry entry = args.entry; |
| 150 | final long inode = args.inode; |
| 151 | final long unique = args.unique; |
| 152 | final int size = args.size; |
| 153 | final long offset = args.offset; |
| 154 | final byte[] data = args.data; |
| 155 | |
| 156 | try { |
| 157 | switch (msg.what) { |
| 158 | case FUSE_LOOKUP: { |
| 159 | final long fileSize = entry.callback.onGetSize(); |
| 160 | synchronized (mLock) { |
| 161 | if (mInstance != 0) { |
| 162 | native_replyLookup(mInstance, unique, inode, fileSize); |
| 163 | } |
| 164 | recycleLocked(args); |
| 165 | } |
| 166 | break; |
| 167 | } |
| 168 | case FUSE_GETATTR: { |
| 169 | final long fileSize = entry.callback.onGetSize(); |
| 170 | synchronized (mLock) { |
| 171 | if (mInstance != 0) { |
| 172 | native_replyGetAttr(mInstance, unique, inode, fileSize); |
| 173 | } |
| 174 | recycleLocked(args); |
| 175 | } |
| 176 | break; |
| 177 | } |
| 178 | case FUSE_READ: |
| 179 | final int readSize = entry.callback.onRead( |
| 180 | offset, size, data); |
| 181 | synchronized (mLock) { |
| 182 | if (mInstance != 0) { |
| 183 | native_replyRead(mInstance, unique, readSize, data); |
| 184 | } |
| 185 | recycleLocked(args); |
| 186 | } |
| 187 | break; |
| 188 | case FUSE_WRITE: |
| 189 | final int writeSize = entry.callback.onWrite(offset, size, data); |
| 190 | synchronized (mLock) { |
| 191 | if (mInstance != 0) { |
| 192 | native_replyWrite(mInstance, unique, writeSize); |
| 193 | } |
| 194 | recycleLocked(args); |
| 195 | } |
| 196 | break; |
| 197 | case FUSE_FSYNC: |
| 198 | entry.callback.onFsync(); |
| 199 | synchronized (mLock) { |
| 200 | if (mInstance != 0) { |
| 201 | native_replySimple(mInstance, unique, FUSE_OK); |
| 202 | } |
| 203 | recycleLocked(args); |
| 204 | } |
| 205 | break; |
| 206 | case FUSE_RELEASE: |
| 207 | entry.callback.onRelease(); |
| 208 | synchronized (mLock) { |
| 209 | if (mInstance != 0) { |
| 210 | native_replySimple(mInstance, unique, FUSE_OK); |
| 211 | } |
| 212 | mBytesMap.stopUsing(entry.getThreadId()); |
| 213 | recycleLocked(args); |
| 214 | } |
| 215 | break; |
| 216 | default: |
| 217 | throw new IllegalArgumentException("Unknown FUSE command: " + msg.what); |
| 218 | } |
| 219 | } catch (Exception error) { |
| 220 | synchronized (mLock) { |
| 221 | Log.e(TAG, "", error); |
| 222 | replySimpleLocked(unique, getError(error)); |
| 223 | recycleLocked(args); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | return true; |
| 228 | } |
| 229 | |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 230 | // Called by JNI. |
| 231 | @SuppressWarnings("unused") |
Mathew Inwood | c185f08 | 2018-08-20 14:28:54 +0100 | [diff] [blame] | 232 | @UnsupportedAppUsage |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 233 | private void onCommand(int command, long unique, long inode, long offset, int size, |
| 234 | byte[] data) { |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 235 | synchronized (mLock) { |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 236 | try { |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 237 | final Args args; |
| 238 | if (mArgsPool.size() == 0) { |
| 239 | args = new Args(); |
| 240 | } else { |
| 241 | args = mArgsPool.pop(); |
| 242 | } |
| 243 | args.unique = unique; |
| 244 | args.inode = inode; |
| 245 | args.offset = offset; |
| 246 | args.size = size; |
| 247 | args.data = data; |
| 248 | args.entry = getCallbackEntryOrThrowLocked(inode); |
| 249 | if (!args.entry.handler.sendMessage( |
| 250 | Message.obtain(args.entry.handler, command, 0, 0, args))) { |
| 251 | throw new ErrnoException("onCommand", OsConstants.EBADF); |
| 252 | } |
| 253 | } catch (Exception error) { |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 254 | replySimpleLocked(unique, getError(error)); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 255 | } |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | // Called by JNI. |
| 260 | @SuppressWarnings("unused") |
Mathew Inwood | c185f08 | 2018-08-20 14:28:54 +0100 | [diff] [blame] | 261 | @UnsupportedAppUsage |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 262 | private byte[] onOpen(long unique, long inode) { |
| 263 | synchronized (mLock) { |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 264 | try { |
| 265 | final CallbackEntry entry = getCallbackEntryOrThrowLocked(inode); |
| 266 | if (entry.opened) { |
| 267 | throw new ErrnoException("onOpen", OsConstants.EMFILE); |
| 268 | } |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 269 | if (mInstance != 0) { |
| 270 | native_replyOpen(mInstance, unique, /* fh */ inode); |
| 271 | entry.opened = true; |
| 272 | return mBytesMap.startUsing(entry.getThreadId()); |
| 273 | } |
| 274 | } catch (ErrnoException error) { |
| 275 | replySimpleLocked(unique, getError(error)); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 276 | } |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 277 | return null; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 278 | } |
| 279 | } |
| 280 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 281 | private static int getError(@NonNull Exception error) { |
| 282 | if (error instanceof ErrnoException) { |
| 283 | final int errno = ((ErrnoException) error).errno; |
| 284 | if (errno != OsConstants.ENOSYS) { |
| 285 | return -errno; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 286 | } |
| 287 | } |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 288 | return -OsConstants.EBADF; |
| 289 | } |
| 290 | |
Andreas Gampe | 3f24e69 | 2018-02-05 13:24:28 -0800 | [diff] [blame] | 291 | @GuardedBy("mLock") |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 292 | private CallbackEntry getCallbackEntryOrThrowLocked(long inode) throws ErrnoException { |
| 293 | final CallbackEntry entry = mCallbackMap.get(checkInode(inode)); |
| 294 | if (entry == null) { |
| 295 | throw new ErrnoException("getCallbackEntryOrThrowLocked", OsConstants.ENOENT); |
| 296 | } |
| 297 | return entry; |
| 298 | } |
| 299 | |
Andreas Gampe | 3f24e69 | 2018-02-05 13:24:28 -0800 | [diff] [blame] | 300 | @GuardedBy("mLock") |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 301 | private void recycleLocked(Args args) { |
| 302 | if (mArgsPool.size() < ARGS_POOL_SIZE) { |
| 303 | mArgsPool.add(args); |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 304 | } |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 305 | } |
| 306 | |
Andreas Gampe | 3f24e69 | 2018-02-05 13:24:28 -0800 | [diff] [blame] | 307 | @GuardedBy("mLock") |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 308 | private void replySimpleLocked(long unique, int result) { |
| 309 | if (mInstance != 0) { |
| 310 | native_replySimple(mInstance, unique, result); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 311 | } |
| 312 | } |
| 313 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 314 | native long native_new(int fd); |
| 315 | native void native_delete(long ptr); |
| 316 | native void native_start(long ptr); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 317 | |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 318 | native void native_replySimple(long ptr, long unique, int result); |
| 319 | native void native_replyOpen(long ptr, long unique, long fh); |
| 320 | native void native_replyLookup(long ptr, long unique, long inode, long size); |
| 321 | native void native_replyGetAttr(long ptr, long unique, long inode, long size); |
| 322 | native void native_replyWrite(long ptr, long unique, int size); |
| 323 | native void native_replyRead(long ptr, long unique, int size, byte[] bytes); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 324 | |
| 325 | private static int checkInode(long inode) { |
| 326 | Preconditions.checkArgumentInRange(inode, MIN_INODE, Integer.MAX_VALUE, "checkInode"); |
| 327 | return (int) inode; |
| 328 | } |
| 329 | |
| 330 | public static class UnmountedException extends Exception {} |
| 331 | |
| 332 | private static class CallbackEntry { |
Daichi Hirono | 9fb0018 | 2016-11-08 14:12:17 +0900 | [diff] [blame] | 333 | final ProxyFileDescriptorCallback callback; |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 334 | final Handler handler; |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 335 | boolean opened; |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 336 | |
| 337 | CallbackEntry(ProxyFileDescriptorCallback callback, Handler handler) { |
| 338 | this.callback = Preconditions.checkNotNull(callback); |
| 339 | this.handler = Preconditions.checkNotNull(handler); |
| 340 | } |
| 341 | |
| 342 | long getThreadId() { |
| 343 | return handler.getLooper().getThread().getId(); |
| 344 | } |
Daichi Hirono | 4f15606 | 2017-02-08 16:20:20 +0900 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Entry for bytes map. |
| 349 | */ |
| 350 | private static class BytesMapEntry { |
| 351 | int counter = 0; |
| 352 | byte[] bytes = new byte[FUSE_MAX_WRITE]; |
| 353 | } |
| 354 | |
| 355 | /** |
| 356 | * Map between Thread ID and byte buffer. |
| 357 | */ |
| 358 | private static class BytesMap { |
| 359 | final Map<Long, BytesMapEntry> mEntries = new HashMap<>(); |
| 360 | |
| 361 | byte[] startUsing(long threadId) { |
| 362 | BytesMapEntry entry = mEntries.get(threadId); |
| 363 | if (entry == null) { |
| 364 | entry = new BytesMapEntry(); |
| 365 | mEntries.put(threadId, entry); |
| 366 | } |
| 367 | entry.counter++; |
| 368 | return entry.bytes; |
| 369 | } |
| 370 | |
| 371 | void stopUsing(long threadId) { |
| 372 | final BytesMapEntry entry = mEntries.get(threadId); |
| 373 | Preconditions.checkNotNull(entry); |
| 374 | entry.counter--; |
| 375 | if (entry.counter <= 0) { |
| 376 | mEntries.remove(threadId); |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | void clear() { |
| 381 | mEntries.clear(); |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 382 | } |
| 383 | } |
Daichi Hirono | 5c2688a | 2017-04-03 13:18:40 +0900 | [diff] [blame] | 384 | |
| 385 | private static class Args { |
| 386 | long unique; |
| 387 | long inode; |
| 388 | long offset; |
| 389 | int size; |
| 390 | byte[] data; |
| 391 | CallbackEntry entry; |
| 392 | } |
Daichi Hirono | 878e86f | 2016-10-31 09:33:30 +0900 | [diff] [blame] | 393 | } |