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;
24import android.os.storage.StorageManager;
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 static final String TAG = "DiskStatsService";
38
39    private final Context mContext;
40
41    public DiskStatsService(Context context) {
42        mContext = context;
43    }
44
45    @Override
46    protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
47        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG);
48
49        // Run a quick-and-dirty performance test: write 512 bytes
50        byte[] junk = new byte[512];
51        for (int i = 0; i < junk.length; i++) junk[i] = (byte) i;  // Write nonzero bytes
52
53        File tmp = new File(Environment.getDataDirectory(), "system/perftest.tmp");
54        FileOutputStream fos = null;
55        IOException error = null;
56
57        long before = SystemClock.uptimeMillis();
58        try {
59            fos = new FileOutputStream(tmp);
60            fos.write(junk);
61        } catch (IOException e) {
62            error = e;
63        } finally {
64            try { if (fos != null) fos.close(); } catch (IOException e) {}
65        }
66
67        long after = SystemClock.uptimeMillis();
68        if (tmp.exists()) tmp.delete();
69
70        if (error != null) {
71            pw.print("Test-Error: ");
72            pw.println(error.toString());
73        } else {
74            pw.print("Latency: ");
75            pw.print(after - before);
76            pw.println("ms [512B Data Write]");
77        }
78
79        reportFreeSpace(Environment.getDataDirectory(), "Data", pw);
80        reportFreeSpace(Environment.getDownloadCacheDirectory(), "Cache", pw);
81        reportFreeSpace(new File("/system"), "System", pw);
82
83        if (StorageManager.isFileEncryptedNativeOnly()) {
84            pw.println("File-based Encryption: true");
85        }
86
87        // TODO: Read /proc/yaffs and report interesting values;
88        // add configurable (through args) performance test parameters.
89    }
90
91    private void reportFreeSpace(File path, String name, PrintWriter pw) {
92        try {
93            StatFs statfs = new StatFs(path.getPath());
94            long bsize = statfs.getBlockSize();
95            long avail = statfs.getAvailableBlocks();
96            long total = statfs.getBlockCount();
97            if (bsize <= 0 || total <= 0) {
98                throw new IllegalArgumentException(
99                        "Invalid stat: bsize=" + bsize + " avail=" + avail + " total=" + total);
100            }
101
102            pw.print(name);
103            pw.print("-Free: ");
104            pw.print(avail * bsize / 1024);
105            pw.print("K / ");
106            pw.print(total * bsize / 1024);
107            pw.print("K total = ");
108            pw.print(avail * 100 / total);
109            pw.println("% free");
110        } catch (IllegalArgumentException e) {
111            pw.print(name);
112            pw.print("-Error: ");
113            pw.println(e.toString());
114            return;
115        }
116    }
117}
118