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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_VOLD_VOLUME_MANAGER_H
#define ANDROID_VOLD_VOLUME_MANAGER_H
#include <pthread.h>
#include <fnmatch.h>
#include <stdlib.h>
#ifdef __cplusplus
#include <list>
#include <mutex>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <cutils/multiuser.h>
#include <utils/List.h>
#include <utils/Timers.h>
#include <sysutils/SocketListener.h>
#include <sysutils/NetlinkEvent.h>
#include "Disk.h"
#include "VolumeBase.h"
/* The length of an MD5 hash when encoded into ASCII hex characters */
#define MD5_ASCII_LENGTH_PLUS_NULL ((MD5_DIGEST_LENGTH*2)+1)
typedef enum { ASEC, OBB } container_type_t;
class ContainerData {
public:
ContainerData(char* _id, container_type_t _type)
: id(_id)
, type(_type)
{}
~ContainerData() {
if (id != NULL) {
free(id);
id = NULL;
}
}
char *id;
container_type_t type;
};
typedef android::List<ContainerData*> AsecIdCollection;
class VolumeManager {
public:
static const char *SEC_ASECDIR_EXT;
static const char *SEC_ASECDIR_INT;
static const char *ASECDIR;
static const char *LOOPDIR;
//TODO remove this with better solution, b/64143519
static bool shutting_down;
private:
static VolumeManager *sInstance;
SocketListener *mBroadcaster;
AsecIdCollection *mActiveContainers;
bool mDebug;
// for adjusting /proc/sys/vm/dirty_ratio when UMS is active
int mUmsSharingCount;
int mSavedDirtyRatio;
int mUmsDirtyRatio;
public:
virtual ~VolumeManager();
// TODO: pipe all requests through VM to avoid exposing this lock
std::mutex& getLock() { return mLock; }
int start();
int stop();
void handleBlockEvent(NetlinkEvent *evt);
class DiskSource {
public:
DiskSource(const std::string& sysPattern, const std::string& nickname, int flags) :
mSysPattern(sysPattern), mNickname(nickname), mFlags(flags) {
}
bool matches(const std::string& sysPath) {
return !fnmatch(mSysPattern.c_str(), sysPath.c_str(), 0);
}
const std::string& getNickname() { return mNickname; }
int getFlags() { return mFlags; }
private:
std::string mSysPattern;
std::string mNickname;
int mFlags;
};
void addDiskSource(const std::shared_ptr<DiskSource>& diskSource);
std::shared_ptr<android::vold::Disk> findDisk(const std::string& id);
std::shared_ptr<android::vold::VolumeBase> findVolume(const std::string& id);
void listVolumes(android::vold::VolumeBase::Type type, std::list<std::string>& list);
nsecs_t benchmarkPrivate(const std::string& id);
int forgetPartition(const std::string& partGuid);
int onUserAdded(userid_t userId, int userSerialNumber);
int onUserRemoved(userid_t userId);
int onUserStarted(userid_t userId);
int onUserStopped(userid_t userId);
int setPrimary(const std::shared_ptr<android::vold::VolumeBase>& vol);
int remountUid(uid_t uid, const std::string& mode);
/* Reset all internal state, typically during framework boot */
int reset();
/* Prepare for device shutdown, safely unmounting all devices */
int shutdown();
/* Unmount all volumes, usually for encryption */
int unmountAll();
/* ASEC */
int findAsec(const char *id, char *asecPath = NULL, size_t asecPathLen = 0,
const char **directory = NULL) const;
int createAsec(const char *id, unsigned long numSectors, const char *fstype,
const char *key, const int ownerUid, bool isExternal);
int resizeAsec(const char *id, unsigned long numSectors, const char *key);
int finalizeAsec(const char *id);
/**
* Fixes ASEC permissions on a filesystem that has owners and permissions.
* This currently means EXT4-based ASEC containers.
*
* There is a single file that can be marked as "private" and will not have
* world-readable permission. The group for that file will be set to the gid
* supplied.
*
* Returns 0 on success.
*/
int fixupAsecPermissions(const char *id, gid_t gid, const char* privateFilename);
int destroyAsec(const char *id, bool force);
int mountAsec(const char *id, const char *key, int ownerUid, bool readOnly);
int unmountAsec(const char *id, bool force);
int renameAsec(const char *id1, const char *id2);
int getAsecMountPath(const char *id, char *buffer, int maxlen);
int getAsecFilesystemPath(const char *id, char *buffer, int maxlen);
/* Loopback images */
int listMountedObbs(SocketClient* cli);
int mountObb(const char *fileName, const char *key, int ownerUid);
int unmountObb(const char *fileName, bool force);
int getObbMountPath(const char *id, char *buffer, int maxlen);
/* Shared between ASEC and Loopback images */
int unmountLoopImage(const char *containerId, const char *loopId,
const char *fileName, const char *mountPoint, bool force);
int updateVirtualDisk();
int setDebug(bool enable);
void setBroadcaster(SocketListener *sl) { mBroadcaster = sl; }
SocketListener *getBroadcaster() { return mBroadcaster; }
static VolumeManager *Instance();
static char *asecHash(const char *id, char *buffer, size_t len);
/*
* Ensure that all directories along given path exist, creating parent
* directories as needed. Validates that given path is absolute and that
* it contains no relative "." or ".." paths or symlinks. Last path segment
* is treated as filename and ignored, unless the path ends with "/". Also
* ensures that path belongs to a volume managed by vold.
*/
int mkdirs(char* path);
private:
VolumeManager();
void readInitialState();
bool isMountpointMounted(const char *mp);
bool isAsecInDirectory(const char *dir, const char *asec) const;
bool isLegalAsecId(const char *id) const;
int linkPrimary(userid_t userId);
std::mutex mLock;
std::list<std::shared_ptr<DiskSource>> mDiskSources;
std::list<std::shared_ptr<android::vold::Disk>> mDisks;
std::unordered_map<userid_t, int> mAddedUsers;
std::unordered_set<userid_t> mStartedUsers;
std::string mVirtualDiskPath;
std::shared_ptr<android::vold::Disk> mVirtualDisk;
std::shared_ptr<android::vold::VolumeBase> mInternalEmulated;
std::shared_ptr<android::vold::VolumeBase> mPrimary;
};
extern "C" {
#endif /* __cplusplus */
#define UNMOUNT_NOT_MOUNTED_ERR (-2)
int vold_unmountAll(void);
#ifdef __cplusplus
}
#endif
#endif
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