Volume.h revision 4ba8948dc16463053e21cda5744f519a555080d0 
1/*
2 * Copyright (C) 2008 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#ifndef _VOLUME_H
18#define _VOLUME_H
19
20#include <utils/List.h>
21
22class NetlinkEvent;
23class VolumeManager;
24
25class Volume {
26private:
27    int mState;
28
29public:
30    static const int State_Init       = -1;
31    static const int State_NoMedia    = 0;
32    static const int State_Idle       = 1;
33    static const int State_Pending    = 2;
34    static const int State_Checking   = 3;
35    static const int State_Mounted    = 4;
36    static const int State_Unmounting = 5;
37    static const int State_Formatting = 6;
38    static const int State_Shared     = 7;
39    static const int State_SharedMnt  = 8;
40
41protected:
42    char *mLabel;
43    char *mMountpoint;
44    VolumeManager *mVm;
45
46    /*
47     * The major/minor tuple of the currently mounted filesystem.
48     */
49    dev_t mCurrentlyMountedKdev;
50
51public:
52    Volume(VolumeManager *vm, const char *label, const char *mount_point);
53    virtual ~Volume();
54
55    int mountVol();
56    int unmountVol(bool force);
57    int formatVol();
58
59    const char *getLabel() { return mLabel; }
60    const char *getMountpoint() { return mMountpoint; }
61    int getState() { return mState; }
62
63    virtual int handleBlockEvent(NetlinkEvent *evt);
64    virtual dev_t getDiskDevice();
65    virtual void handleVolumeShared();
66    virtual void handleVolumeUnshared();
67
68protected:
69    void setState(int state);
70
71    virtual int getDeviceNodes(dev_t *devs, int max) = 0;
72
73    int createDeviceNode(const char *path, int major, int minor);
74
75private:
76    int initializeMbr(const char *deviceNode);
77    bool isMountpointMounted(const char *path);
78};
79
80typedef android::List<Volume *> VolumeCollection;
81
82#endif
83