Unmount appfuse when the device FD is closed. (91e3b506) · Commits · e / os / android_frameworks_base

core/java/android/os/ParcelFileDescriptor.java

+13 −0

Original line number	Diff line number	Diff line
		@@ -233,6 +233,19 @@ public class ParcelFileDescriptor implements Parcelable, Closeable {
		final FileDescriptor fd = openInternal(file, mode);
		if (fd == null) return null;

		return fromFd(fd, handler, listener);
		}

		/** {@hide} */
		public static ParcelFileDescriptor fromFd(
		FileDescriptor fd, Handler handler, final OnCloseListener listener) throws IOException {
		if (handler == null) {
		throw new IllegalArgumentException("Handler must not be null");
		}
		if (listener == null) {
		throw new IllegalArgumentException("Listener must not be null");
		}

		final FileDescriptor[] comm = createCommSocketPair();
		final ParcelFileDescriptor pfd = new ParcelFileDescriptor(fd, comm[0]);
		final MessageQueue queue = handler.getLooper().getQueue();

packages/MtpDocumentsProvider/jni/com_android_mtp_AppFuse.cpp

+24 −7

Original line number	Diff line number	Diff line
		@@ -62,6 +62,19 @@ struct FuseRequest {
		}
		};

		class ScopedFd {
		int mFd;

		public:
		explicit ScopedFd(int fd) : mFd(fd) {}
		~ScopedFd() {
		close(mFd);
		}
		operator int() {
		return mFd;
		}
		};

		/**
		* The class is used to access AppFuse class in Java from fuse handlers.
		*/
		@@ -70,24 +83,26 @@ public:
		AppFuse(JNIEnv* /env/, jobject /self/) {
		}

		void handle_fuse_request(int fd, const FuseRequest& req) {
		bool handle_fuse_request(int fd, const FuseRequest& req) {
		ALOGV("Request op=%d", req.header().opcode);
		switch (req.header().opcode) {
		// TODO: Handle more operations that are enough to provide seekable
		// FD.
		case FUSE_INIT:
		invoke_handler(fd, req, &AppFuse::handle_fuse_init);
		break;
		return true;
		case FUSE_GETATTR:
		invoke_handler(fd, req, &AppFuse::handle_fuse_getattr);
		break;
		return true;
		case FUSE_FORGET:
		return false;
		default: {
		ALOGV("NOTIMPL op=%d uniq=%" PRIx64 " nid=%" PRIx64 "\n",
		req.header().opcode,
		req.header().unique,
		req.header().nodeid);
		fuse_reply(fd, req.header().unique, -ENOSYS, NULL, 0);
		break;
		return true;
		}
		}
		}
		@@ -198,7 +213,7 @@ private:

		jboolean com_android_mtp_AppFuse_start_app_fuse_loop(
		JNIEnv* env, jobject self, jint jfd) {
		const int fd = static_cast<int>(jfd);
		ScopedFd fd(dup(static_cast<int>(jfd)));
		AppFuse appfuse(env, self);

		ALOGD("Start fuse loop.");
		@@ -209,7 +224,7 @@ jboolean com_android_mtp_AppFuse_start_app_fuse_loop(
		if (result < 0) {
		if (errno == ENODEV) {
		ALOGE("Someone stole our marbles!\n");
		return false;
		return JNI_FALSE;
		}
		ALOGE("Failed to read bytes from FD: errno=%d\n", errno);
		continue;
		@@ -227,7 +242,9 @@ jboolean com_android_mtp_AppFuse_start_app_fuse_loop(
		continue;
		}

		appfuse.handle_fuse_request(fd, request);
		if (!appfuse.handle_fuse_request(fd, request)) {
		return JNI_TRUE;
		}
		}
		}

packages/MtpDocumentsProvider/src/com/android/mtp/AppFuse.java

+18 −0

Original line number	Diff line number	Diff line
		@@ -18,10 +18,13 @@ package com.android.mtp;

		import android.os.ParcelFileDescriptor;
		import android.os.storage.StorageManager;
		import android.util.Log;

		import com.android.internal.annotations.VisibleForTesting;

		import java.io.File;
		import java.io.IOException;

		import android.os.Process;

		/**
		@@ -54,6 +57,21 @@ public class AppFuse {
		mMessageThread.start();
		}

		@VisibleForTesting
		void close() {
		try {
		// Remote side of ParcelFileDescriptor is tracking the close of mDeviceFd, and unmount
		// the corresponding fuse file system. The mMessageThread will receive FUSE_FORGET, and
		// then terminate itself.
		mDeviceFd.close();
		mMessageThread.join();
		} catch (IOException exp) {
		Log.e(MtpDocumentsProvider.TAG, "Failed to close device FD.", exp);
		} catch (InterruptedException exp) {
		Log.e(MtpDocumentsProvider.TAG, "Failed to terminate message thread.", exp);
		}
		}

		@VisibleForTesting
		File getMountPoint() {
		return new File("/mnt/appfuse/" + Process.myUid() + "_" + mName);

packages/MtpDocumentsProvider/tests/src/com/android/mtp/AppFuseTest.java

+8 −1

Original line number	Diff line number	Diff line
		@@ -17,6 +17,8 @@
		package com.android.mtp;

		import android.os.storage.StorageManager;
		import android.system.ErrnoException;
		import android.system.Os;
		import android.test.AndroidTestCase;
		import android.test.suitebuilder.annotation.SmallTest;

		@@ -26,12 +28,17 @@ import java.io.File;
		public class AppFuseTest extends AndroidTestCase {
		/**
		* TODO: Enable this test after adding SELinux policies for appfuse.
		* @throws ErrnoException
		* @throws InterruptedException
		*/
		public void testBasic() {
		public void disabled_testBasic() throws ErrnoException, InterruptedException {
		final StorageManager storageManager = getContext().getSystemService(StorageManager.class);
		final AppFuse appFuse = new AppFuse("test");
		appFuse.mount(storageManager);
		final File file = appFuse.getMountPoint();
		assertTrue(file.isDirectory());
		assertEquals(1, Os.stat(file.getPath()).st_ino);
		appFuse.close();
		assertTrue(1 != Os.stat(file.getPath()).st_ino);
		}
		}

services/core/java/com/android/server/MountService.java

+21 −6

Original line number	Diff line number	Diff line
		@@ -2812,17 +2812,32 @@ class MountService extends IMountService.Stub
		}

		@Override
		public ParcelFileDescriptor mountAppFuse(String name) throws RemoteException {
		public ParcelFileDescriptor mountAppFuse(final String name) throws RemoteException {
		try {
		final int uid = Binder.getCallingUid();
		final NativeDaemonEvent event =
		mConnector.execute("appfuse", "mount", Binder.getCallingUid(), name);
		mConnector.execute("appfuse", "mount", uid, name);
		if (event.getFileDescriptors() == null) {
		Log.e(TAG, "AppFuse FD from vold is null.");
		return null;
		throw new RemoteException("AppFuse FD from vold is null.");
		}
		return ParcelFileDescriptor.fromFd(
		event.getFileDescriptors()[0],
		mHandler,
		new ParcelFileDescriptor.OnCloseListener() {
		@Override
		public void onClose(IOException e) {
		try {
		final NativeDaemonEvent event = mConnector.execute(
		"appfuse", "unmount", uid, name);
		} catch (NativeDaemonConnectorException unmountException) {
		Log.e(TAG, "Failed to unmount appfuse.");
		}
		}
		return new ParcelFileDescriptor(event.getFileDescriptors()[0]);
		});
		} catch (NativeDaemonConnectorException e) {
		throw e.rethrowAsParcelableException();
		} catch (IOException e) {
		throw new RemoteException(e.getMessage());
		}
		}