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      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 
     22 class NetlinkEvent;
     23 class VolumeManager;
     24 
     25 class Volume {
     26 private:
     27     int mState;
     28 
     29 public:
     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 
     41     static const char *SECDIR;
     42     static const char *SEC_STGDIR;
     43     static const char *SEC_STG_SECIMGDIR;
     44     static const char *SEC_ASECDIR;
     45     static const char *ASECDIR;
     46 
     47     static const char *LOOPDIR;
     48 
     49 protected:
     50     char *mLabel;
     51     char *mMountpoint;
     52     VolumeManager *mVm;
     53     bool mDebug;
     54     int mPartIdx;
     55     int mOrigPartIdx;
     56     bool mRetryMount;
     57 
     58     /*
     59      * The major/minor tuple of the currently mounted filesystem.
     60      */
     61     dev_t mCurrentlyMountedKdev;
     62 
     63 public:
     64     Volume(VolumeManager *vm, const char *label, const char *mount_point);
     65     virtual ~Volume();
     66 
     67     int mountVol();
     68     int unmountVol(bool force, bool revert);
     69     int formatVol();
     70 
     71     const char *getLabel() { return mLabel; }
     72     const char *getMountpoint() { return mMountpoint; }
     73     int getState() { return mState; }
     74 
     75     virtual int handleBlockEvent(NetlinkEvent *evt);
     76     virtual dev_t getDiskDevice();
     77     virtual dev_t getShareDevice();
     78     virtual void handleVolumeShared();
     79     virtual void handleVolumeUnshared();
     80 
     81     void setDebug(bool enable);
     82     virtual int getVolInfo(struct volume_info *v) = 0;
     83 
     84 protected:
     85     void setState(int state);
     86 
     87     virtual int getDeviceNodes(dev_t *devs, int max) = 0;
     88     virtual int updateDeviceInfo(char *new_path, int new_major, int new_minor) = 0;
     89     virtual void revertDeviceInfo(void) = 0;
     90     virtual int isDecrypted(void) = 0;
     91     virtual int getFlags(void) = 0;
     92 
     93     int createDeviceNode(const char *path, int major, int minor);
     94 
     95 private:
     96     int initializeMbr(const char *deviceNode);
     97     bool isMountpointMounted(const char *path);
     98     int createBindMounts();
     99     int doUnmount(const char *path, bool force);
    100     int doMoveMount(const char *src, const char *dst, bool force);
    101     void protectFromAutorunStupidity();
    102 };
    103 
    104 typedef android::List<Volume *> VolumeCollection;
    105 
    106 #endif
    107