1 /*
2  * Copyright (C) 2010 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.server;
18 
19 import android.content.Context;
20 import android.os.Binder;
21 import android.os.Environment;
22 import android.os.StatFs;
23 import android.os.SystemClock;
24 
25 import java.io.File;
26 import java.io.FileDescriptor;
27 import java.io.FileOutputStream;
28 import java.io.IOException;
29 import java.io.PrintWriter;
30 
31 /**
32  * This service exists only as a "dumpsys" target which reports
33  * statistics about the status of the disk.
34  */
35 public class DiskStatsService extends Binder {
36     private static final String TAG = "DiskStatsService";
37 
38     private final Context mContext;
39 
DiskStatsService(Context context)40     public DiskStatsService(Context context) {
41         mContext = context;
42     }
43 
44     @Override
dump(FileDescriptor fd, PrintWriter pw, String[] args)45     protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
46         mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG);
47 
48         // Run a quick-and-dirty performance test: write 512 bytes
49         byte[] junk = new byte[512];
50         for (int i = 0; i < junk.length; i++) junk[i] = (byte) i;  // Write nonzero bytes
51 
52         File tmp = new File(Environment.getDataDirectory(), "system/perftest.tmp");
53         FileOutputStream fos = null;
54         IOException error = null;
55 
56         long before = SystemClock.uptimeMillis();
57         try {
58             fos = new FileOutputStream(tmp);
59             fos.write(junk);
60         } catch (IOException e) {
61             error = e;
62         } finally {
63             try { if (fos != null) fos.close(); } catch (IOException e) {}
64         }
65 
66         long after = SystemClock.uptimeMillis();
67         if (tmp.exists()) tmp.delete();
68 
69         if (error != null) {
70             pw.print("Test-Error: ");
71             pw.println(error.toString());
72         } else {
73             pw.print("Latency: ");
74             pw.print(after - before);
75             pw.println("ms [512B Data Write]");
76         }
77 
78         reportFreeSpace(Environment.getDataDirectory(), "Data", pw);
79         reportFreeSpace(Environment.getDownloadCacheDirectory(), "Cache", pw);
80         reportFreeSpace(new File("/system"), "System", pw);
81 
82         // TODO: Read /proc/yaffs and report interesting values;
83         // add configurable (through args) performance test parameters.
84     }
85 
reportFreeSpace(File path, String name, PrintWriter pw)86     private void reportFreeSpace(File path, String name, PrintWriter pw) {
87         try {
88             StatFs statfs = new StatFs(path.getPath());
89             long bsize = statfs.getBlockSize();
90             long avail = statfs.getAvailableBlocks();
91             long total = statfs.getBlockCount();
92             if (bsize <= 0 || total <= 0) {
93                 throw new IllegalArgumentException(
94                         "Invalid stat: bsize=" + bsize + " avail=" + avail + " total=" + total);
95             }
96 
97             pw.print(name);
98             pw.print("-Free: ");
99             pw.print(avail * bsize / 1024);
100             pw.print("K / ");
101             pw.print(total * bsize / 1024);
102             pw.print("K total = ");
103             pw.print(avail * 100 / total);
104             pw.println("% free");
105         } catch (IllegalArgumentException e) {
106             pw.print(name);
107             pw.print("-Error: ");
108             pw.println(e.toString());
109             return;
110         }
111     }
112 }
113