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      1 /*
      2  * Copyright (C) 2017 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.cts.storageapp;
     18 
     19 import static com.android.cts.storageapp.Utils.TAG;
     20 import static com.android.cts.storageapp.Utils.makeUniqueFile;
     21 
     22 import android.os.SystemClock;
     23 import android.system.ErrnoException;
     24 import android.system.Os;
     25 import android.system.OsConstants;
     26 import android.system.StructStatVfs;
     27 import android.util.Log;
     28 
     29 import java.io.File;
     30 import java.io.FileDescriptor;
     31 import java.io.IOException;
     32 
     33 /**
     34  * Utility that tries its hardest to use all possible disk resources.
     35  */
     36 public class Hoarder {
     37     private static final String BLOCKS = "blocks";
     38     private static final String INODES = "inodes";
     39 
     40     public static void main(String[] args) {
     41         final File dir = new File(args[2]);
     42         try {
     43             switch (args[0]) {
     44                 case BLOCKS:
     45                     doBlocks(dir, false);
     46                     break;
     47                 case INODES:
     48                     doInodes(dir, false);
     49                     break;
     50             }
     51         } catch (IOException e) {
     52             System.out.println("Failed to allocate: " + e.getMessage());
     53             System.exit(1);
     54         }
     55 
     56         Log.d(TAG, "Directory gone; giving up");
     57         System.exit(0);
     58     }
     59 
     60     public static void doBlocks(File dir, boolean oneshot) throws IOException {
     61         int failures = 0;
     62         while (dir.exists()) {
     63             final File target = makeUniqueFile(dir);
     64             FileDescriptor fd = null;
     65             try {
     66                 final long size;
     67                 if (failures == 0) {
     68                     final StructStatVfs stat = Os.statvfs(dir.getAbsolutePath());
     69                     size = (stat.f_bfree * stat.f_frsize) / 2;
     70                 } else {
     71                     size = 65536;
     72                 }
     73                 Log.d(TAG, "Attempting to allocate " + size);
     74 
     75                 fd = Os.open(target.getAbsolutePath(),
     76                         OsConstants.O_RDWR | OsConstants.O_CREAT, 0700);
     77                 Os.posix_fallocate(fd, 0, size);
     78             } catch (ErrnoException e) {
     79                 if (e.errno == OsConstants.ENOSPC || e.errno == OsConstants.EDQUOT) {
     80                     failures = Math.min(failures + 1, 32);
     81                     if (oneshot && failures >= 4) {
     82                         Log.d(TAG, "Full!");
     83                         return;
     84                     } else {
     85                         Log.d(TAG, "Failed to allocate; trying again");
     86                         SystemClock.sleep(1000);
     87                     }
     88                 } else {
     89                     throw new IOException(e);
     90                 }
     91             } finally {
     92                 try {
     93                     if (fd != null) Os.close(fd);
     94                 } catch (ErrnoException ignored) {
     95                 }
     96             }
     97         }
     98     }
     99 
    100     public static void doInodes(File dir, boolean oneshot) throws IOException {
    101         int failures = 0;
    102         while (dir.exists()) {
    103             try {
    104                 final int size = (failures == 0) ? 512 : 16;
    105                 Log.d(TAG, "Attempting to allocate " + size + " inodes");
    106 
    107                 final File a = makeUniqueFile(dir);
    108                 Os.mkdir(a.getAbsolutePath(), 0700);
    109                 for (int i = 0; i < size; i++) {
    110                     final File b = makeUniqueFile(a);
    111                     Os.mkdir(b.getAbsolutePath(), 0700);
    112                 }
    113             } catch (ErrnoException e) {
    114                 if (e.errno == OsConstants.ENOSPC || e.errno == OsConstants.EDQUOT) {
    115                     failures = Math.min(failures + 1, 32);
    116                     if (oneshot && failures >= 4) {
    117                         Log.d(TAG, "Full!");
    118                         return;
    119                     } else {
    120                         Log.d(TAG, "Failed to allocate; trying again");
    121                         SystemClock.sleep(1000);
    122                     }
    123                 } else {
    124                     throw new IOException(e);
    125                 }
    126             }
    127         }
    128     }
    129 }
    130