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
17package com.android.server;
18
19import android.content.Context;
20import android.os.Binder;
21import android.os.Environment;
22import android.os.StatFs;
23import android.os.SystemClock;
24
25import java.io.File;
26import java.io.FileDescriptor;
27import java.io.FileOutputStream;
28import java.io.IOException;
29import 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 */
35public class DiskStatsService extends Binder {
36    private static final String TAG = "DiskStatsService";
37
38    private final Context mContext;
39
40    public DiskStatsService(Context context) {
41        mContext = context;
42    }
43
44    @Override
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
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