Merge "Allocate space using new StorageManager API."

import static android.provider.DocumentsContract.buildDocumentUri;

import static android.provider.DocumentsContract.getDocumentId;

import static android.provider.DocumentsContract.isChildDocument;

import static com.android.documentsui.OperationDialogFragment.DIALOG_TYPE_CONVERTED;

import static com.android.documentsui.base.DocumentInfo.getCursorLong;

import static com.android.documentsui.base.DocumentInfo.getCursorString;

import static com.android.documentsui.base.Shared.DEBUG;

import static com.android.documentsui.services.FileOperationService.EXTRA_DIALOG_TYPE;

import static com.android.documentsui.services.FileOperationService.EXTRA_OPERATION_TYPE;

import static com.android.documentsui.services.FileOperationService.EXTRA_FAILED_DOCS;

import static com.android.documentsui.services.FileOperationService.OPERATION_COPY;

import static com.android.documentsui.services.FileOperationService.EXTRA_OPERATION_TYPE;

import static com.android.documentsui.services.FileOperationService.MESSAGE_FINISH;

import static com.android.documentsui.services.FileOperationService.MESSAGE_PROGRESS;

import static com.android.documentsui.services.FileOperationService.OPERATION_COPY;

import android.annotation.StringRes;

import android.app.Notification;

import android.database.ContentObserver;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.os.CancellationSignal;

import android.os.Handler;

import android.os.Looper;

import android.os.Messenger;

import android.os.ParcelFileDescriptor;

import android.os.RemoteException;

import android.os.storage.StorageManager;

import android.provider.DocumentsContract;

import android.provider.DocumentsContract.Document;

import android.system.ErrnoException;

import libcore.io.IoUtils;

import java.io.FileDescriptor;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.text.NumberFormat;

import java.util.ArrayList;

import javax.annotation.Nullable;

class CopyJob extends ResolvedResourcesJob {

    private static final String TAG = "CopyJob";

            int len;

            boolean reading = true;

            try {

                // If we know the source size, and the destination supports disk

                // space allocation, then allocate the space we'll need. This

                // uses fallocate() under the hood to optimize on-disk layout

                // and prevent us from running out of space during large copies.

                final StorageManager sm = service.getSystemService(StorageManager.class);

                final long srcSize = srcFile.getStatSize();

                final FileDescriptor dstFd = dstFile.getFileDescriptor();

                if (srcSize > 0 && sm.isAllocationSupported(dstFd)) {

                    sm.allocateBytes(dstFd, srcSize);

                }

                while ((len = in.read(buffer)) != -1) {

                    if (isCanceled()) {

                        if (DEBUG) Log.d(TAG, "Canceled copy mid-copy of: " + src.derivedUri);