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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 #include <fs_mgr.h>
     22 
     23 class NetlinkEvent;
     24 class VolumeManager;
     25 
     26 class Volume {
     27 private:
     28     int mState;
     29     int mFlags;
     30 
     31 public:
     32     static const int State_Init       = -1;
     33     static const int State_NoMedia    = 0;
     34     static const int State_Idle       = 1;
     35     static const int State_Pending    = 2;
     36     static const int State_Checking   = 3;
     37     static const int State_Mounted    = 4;
     38     static const int State_Unmounting = 5;
     39     static const int State_Formatting = 6;
     40     static const int State_Shared     = 7;
     41     static const int State_SharedMnt  = 8;
     42 
     43     static const char *MEDIA_DIR;
     44     static const char *FUSE_DIR;
     45     static const char *SEC_ASECDIR_EXT;
     46     static const char *SEC_ASECDIR_INT;
     47     static const char *ASECDIR;
     48     static const char *LOOPDIR;
     49     static const char *BLKID_PATH;
     50 
     51 protected:
     52     char* mLabel;
     53     char* mUuid;
     54     char* mUserLabel;
     55     VolumeManager *mVm;
     56     bool mDebug;
     57     int mPartIdx;
     58     int mOrigPartIdx;
     59     bool mRetryMount;
     60 
     61     /*
     62      * The major/minor tuple of the currently mounted filesystem.
     63      */
     64     dev_t mCurrentlyMountedKdev;
     65 
     66 public:
     67     Volume(VolumeManager *vm, const fstab_rec* rec, int flags);
     68     virtual ~Volume();
     69 
     70     int mountVol();
     71     int unmountVol(bool force, bool revert);
     72     int formatVol(bool wipe);
     73 
     74     const char* getLabel() { return mLabel; }
     75     const char* getUuid() { return mUuid; }
     76     const char* getUserLabel() { return mUserLabel; }
     77     int getState() { return mState; }
     78     int getFlags() { return mFlags; };
     79 
     80     /* Mountpoint of the raw volume */
     81     virtual const char *getMountpoint() = 0;
     82     virtual const char *getFuseMountpoint() = 0;
     83 
     84     virtual int handleBlockEvent(NetlinkEvent *evt);
     85     virtual dev_t getDiskDevice();
     86     virtual dev_t getShareDevice();
     87     virtual void handleVolumeShared();
     88     virtual void handleVolumeUnshared();
     89 
     90     void setDebug(bool enable);
     91     virtual int getVolInfo(struct volume_info *v) = 0;
     92 
     93 protected:
     94     void setUuid(const char* uuid);
     95     void setUserLabel(const char* userLabel);
     96     void setState(int state);
     97 
     98     virtual int getDeviceNodes(dev_t *devs, int max) = 0;
     99     virtual int updateDeviceInfo(char *new_path, int new_major, int new_minor) = 0;
    100     virtual void revertDeviceInfo(void) = 0;
    101     virtual int isDecrypted(void) = 0;
    102 
    103     int createDeviceNode(const char *path, int major, int minor);
    104 
    105 private:
    106     int initializeMbr(const char *deviceNode);
    107     bool isMountpointMounted(const char *path);
    108     int mountAsecExternal();
    109     int doUnmount(const char *path, bool force);
    110     int extractMetadata(const char* devicePath);
    111 };
    112 
    113 typedef android::List<Volume *> VolumeCollection;
    114 
    115 #endif
    116