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.FileUtils;
23import android.os.StatFs;
24import android.os.SystemClock;
25
26import java.io.File;
27import java.io.FileDescriptor;
28import java.io.FileOutputStream;
29import java.io.IOException;
30import java.io.PrintWriter;
31
32/**
33 * This service exists only as a "dumpsys" target which reports
34 * statistics about the status of the disk.
35 */
36public class DiskStatsService extends Binder {
37    private final Context mContext;
38
39    public DiskStatsService(Context context) {
40        mContext = context;
41    }
42
43    @Override
44    protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
45        // This data is accessible to any app -- no permission check needed.
46
47        // Run a quick-and-dirty performance test: write 512 bytes
48        byte[] junk = new byte[512];
49        for (int i = 0; i < junk.length; i++) junk[i] = (byte) i;  // Write nonzero bytes
50
51        File tmp = new File(Environment.getDataDirectory(), "system/perftest.tmp");
52        FileOutputStream fos = null;
53        IOException error = null;
54
55        long before = SystemClock.uptimeMillis();
56        try {
57            fos = new FileOutputStream(tmp);
58            fos.write(junk);
59        } catch (IOException e) {
60            error = e;
61        } finally {
62            try { if (fos != null) fos.close(); } catch (IOException e) {}
63        }
64
65        long after = SystemClock.uptimeMillis();
66        if (tmp.exists()) tmp.delete();
67
68        if (error != null) {
69            pw.print("Test-Error: ");
70            pw.println(error.toString());
71        } else {
72            pw.print("Latency: ");
73            pw.print(after - before);
74            pw.println("ms [512B Data Write]");
75        }
76
77        reportFreeSpace(Environment.getDataDirectory(), "Data", pw);
78        reportFreeSpace(Environment.getDownloadCacheDirectory(), "Cache", pw);
79        reportFreeSpace(new File("/system"), "System", pw);
80
81        // TODO: Read /proc/yaffs and report interesting values;
82        // add configurable (through args) performance test parameters.
83    }
84
85    private void reportFreeSpace(File path, String name, PrintWriter pw) {
86        try {
87            StatFs statfs = new StatFs(path.getPath());
88            long bsize = statfs.getBlockSize();
89            long avail = statfs.getAvailableBlocks();
90            long total = statfs.getBlockCount();
91            if (bsize <= 0 || total <= 0) {
92                throw new IllegalArgumentException(
93                        "Invalid stat: bsize=" + bsize + " avail=" + avail + " total=" + total);
94            }
95
96            pw.print(name);
97            pw.print("-Free: ");
98            pw.print(avail * bsize / 1024);
99            pw.print("K / ");
100            pw.print(total * bsize / 1024);
101            pw.print("K total = ");
102            pw.print(avail * 100 / total);
103            pw.println("% free");
104        } catch (IllegalArgumentException e) {
105            pw.print(name);
106            pw.print("-Error: ");
107            pw.println(e.toString());
108            return;
109        }
110    }
111}
112