C++ VolumeManager类代码示例

int main() {

    VolumeManager *vm;
    CommandListener *cl;
    NetlinkManager *nm;

    SLOGI("Vold 2.1 (the revenge) firing up");

    mkdir("/dev/block/vold", 0755);

    /* Create our singleton managers */
    if (!(vm = VolumeManager::Instance())) {
        SLOGE("Unable to create VolumeManager");
        exit(1);
    };

    if (!(nm = NetlinkManager::Instance())) {
        SLOGE("Unable to create NetlinkManager");
        exit(1);
    };


    cl = new CommandListener();
    vm->setBroadcaster((SocketListener *) cl);
    nm->setBroadcaster((SocketListener *) cl);

    if (vm->start()) {
        SLOGE("Unable to start VolumeManager (%s)", strerror(errno));
        exit(1);
    }

    if (process_config(vm)) {
        SLOGE("Error reading configuration (%s)... continuing anyways", strerror(errno));
    }

    if (nm->start()) {
        SLOGE("Unable to start NetlinkManager (%s)", strerror(errno));
        exit(1);
    }

    coldboot("/sys/block");
//    coldboot("/sys/class/switch");

    /*
     * Now that we're up, we can respond to commands
     */
    if (cl->startListener()) {
        SLOGE("Unable to start CommandListener (%s)", strerror(errno));
        exit(1);
    }

    // Eventually we'll become the monitoring thread
    while(1) {
        sleep(1000);
    }

    SLOGI("Vold exiting");
    exit(0);
}

int CommandListener::ObbCmd::runCommand(SocketClient *cli,
                                                      int argc, char **argv) {
    if (argc < 2) {
        cli->sendMsg(ResponseCode::CommandSyntaxError, "Missing Argument", false);
        return 0;
    }

    VolumeManager *vm = VolumeManager::Instance();
    int rc = 0;

    if (!strcmp(argv[1], "list")) {
        dumpArgs(argc, argv, -1);

        rc = vm->listMountedObbs(cli);
    } else if (!strcmp(argv[1], "mount")) {
            dumpArgs(argc, argv, 3);
            if (argc != 5) {
                cli->sendMsg(ResponseCode::CommandSyntaxError,
                        "Usage: obb mount <filename> <key> <ownerUid>", false);
                return 0;
            }
            rc = vm->mountObb(argv[2], argv[3], atoi(argv[4]));
    } else if (!strcmp(argv[1], "unmount")) {
        dumpArgs(argc, argv, -1);
        if (argc < 3) {
            cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: obb unmount <source file> [force]", false);
            return 0;
        }
        bool force = false;
        if (argc > 3 && !strcmp(argv[3], "force")) {
            force = true;
        }
        rc = vm->unmountObb(argv[2], force);
    } else if (!strcmp(argv[1], "path")) {
        dumpArgs(argc, argv, -1);
        if (argc != 3) {
            cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: obb path <source file>", false);
            return 0;
        }
        char path[255];

        if (!(rc = vm->getObbMountPath(argv[2], path, sizeof(path)))) {
            cli->sendMsg(ResponseCode::AsecPathResult, path, false);
            return 0;
        }
    } else {
        dumpArgs(argc, argv, -1);
        cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown obb cmd", false);
    }

    if (!rc) {
        cli->sendMsg(ResponseCode::CommandOkay, "obb operation succeeded", false);
    } else {
        rc = ResponseCode::convertFromErrno();
        cli->sendMsg(rc, "obb operation failed", true);
    }

    return 0;
}

extern "C" int vold_unmountAllAsecs(void) {
    int rc;

    VolumeManager *vm = VolumeManager::Instance();
    rc = vm->unmountAllAsecsInDir(Volume::SEC_ASECDIR_EXT);
    if (vm->unmountAllAsecsInDir(Volume::SEC_ASECDIR_INT)) {
        rc = -1;
    }
    return rc;
}

TrimTask::TrimTask(int flags) : mFlags(flags) {
    // Collect both fstab and vold volumes
    addFromFstab();

    VolumeManager* vm = VolumeManager::Instance();
    std::list<std::string> privateIds;
    vm->listVolumes(VolumeBase::Type::kPrivate, privateIds);
    for (const auto& id : privateIds) {
        auto vol = vm->findVolume(id);
        if (vol != nullptr && vol->getState() == VolumeBase::State::kMounted) {
            mPaths.push_back(vol->getPath());
        }
    }
}

// netfs_free_query_cookie
static
int
netfs_free_query_cookie(void *ns, void *node, void *cookie)
{
	VolumeManager* volumeManager = (VolumeManager*)ns;
	QueryIterator* iterator = (QueryIterator*)cookie;

	PRINT("netfs_free_query_cookie(%p, %p)\n", ns, cookie);

	status_t error = B_OK;
	volumeManager->GetQueryManager()->PutIterator(iterator);

	PRINT("netfs_free_query_cookie() done: (%" B_PRIx32 ")\n", error);
	return error;
}

// GetNode
Node*
ClientVolume::GetNode(dev_t volumeID, ino_t nodeID)
{
	VolumeManager* volumeManager = VolumeManager::GetDefault();

	// get the node
	Node* node = volumeManager->GetNode(volumeID, nodeID);
	if (!node)
		return NULL;

	// check, if the node is contained by the root dir of the client volume
	if (volumeManager->DirectoryContains(GetRootDirectory(), node, true))
		return node;

	return NULL;
}

// GetDirectory
Directory*
ClientVolume::GetDirectory(dev_t volumeID, ino_t nodeID)
{
	VolumeManager* volumeManager = VolumeManager::GetDefault();

	// get the directory
	Directory* dir = GetDirectory(volumeID, nodeID);
	if (!dir)
		return NULL;

	// check, if the dir is contained by the root dir of the client volume
	if (volumeManager->DirectoryContains(GetRootDirectory(), dir, true))
		return dir;

	return NULL;
}

// netfs_write_fs_stat
static
int
netfs_write_fs_stat(void *ns, struct fs_info *info, long mask)
{
	VolumeManager* volumeManager = (VolumeManager*)ns;
	Volume* volume = volumeManager->GetRootVolume();
	VolumePutter _(volume);

	PRINT("netfs_write_fs_stat(%p, %p, %ld)\n", ns, info, mask);

	status_t error = B_BAD_VALUE;
	if (volume)
		error = volume->WriteFSStat(info, mask);

	PRINT("netfs_write_fs_stat() done: %" B_PRIx32 " \n", error);

	return error;
}

void NetlinkHandler::onEvent(NetlinkEvent *evt) {
    VolumeManager *vm = VolumeManager::Instance();
    const char *subsys = evt->getSubsystem();

    if (!subsys) {
        SLOGW("No subsystem found in netlink event");
        return;
    }

    if (!strcmp(subsys, "block")) {
        vm->handleBlockEvent(evt);
    }
#if defined(BOARD_USES_HDMI) || defined(S5P_BOARD_USES_HDMI)
    else if ((!strcmp(subsys, "misc")) || (!strcmp(subsys, "video4linux"))) {
        vm->handleMiscEvent(evt);
    }
#endif
}

// netfs_read_vnode
static
int
netfs_read_vnode(void *ns, vnode_id vnid, char reenter, void **node)
{
	VolumeManager* volumeManager = (VolumeManager*)ns;
	Volume* volume = volumeManager->GetVolume(vnid);
	VolumePutter _(volume);

	PRINT(("netfs_read_vnode(%p, %Ld, %d, %p)\n", ns, vnid, reenter, node));

	status_t error = B_BAD_VALUE;
	if (volume)
		error = volume->ReadVNode(vnid, reenter, (Node**)node);

	PRINT(("netfs_read_vnode() done: (%lx, %p)\n", error, *node));

	return error;
}

// netfs_read_fs_stat
static
int
netfs_read_fs_stat(void *ns, struct fs_info *info)
{
	VolumeManager* volumeManager = (VolumeManager*)ns;
	Volume* volume = volumeManager->GetRootVolume();
	VolumePutter _(volume);

	PRINT(("netfs_read_fs_stat(%p, %p)\n", ns, info));

	status_t error = B_BAD_VALUE;
	if (volume)
		error = volume->ReadFSStat(info);

	PRINT(("netfs_read_fs_stat() done: %lx \n", error));

	return error;
}

// netfs_sync
static
int
netfs_sync(void *ns)
{
	VolumeManager* volumeManager = (VolumeManager*)ns;
	Volume* volume = volumeManager->GetRootVolume();
	VolumePutter _(volume);

	PRINT("netfs_sync(%p)\n", ns);

	status_t error = B_BAD_VALUE;
	if (volume)
		error = volume->Sync();

	PRINT("netfs_sync() done: %" B_PRIx32 " \n", error);

	return error;
}

// Mount
status_t
ClientVolume::Mount(UserSecurityContext* securityContext, Share* share)
{
	if (!securityContext || !share)
		return B_BAD_VALUE;
	ObjectDeleter<UserSecurityContext> securityContextDeleter(securityContext);
	if (IsMounted())
		return B_BAD_VALUE;
	fSecurityContext = securityContext;
	securityContextDeleter.Detach();

	fShare = share;
	fShare->AcquireReference();
	dev_t volumeID = share->GetVolumeID();
	ino_t nodeID = share->GetNodeID();

	// into root node ref
	fRootNodeRef.device = volumeID;
	fRootNodeRef.node = nodeID;

	// get the share permissions
	fSharePermissions = securityContext->GetNodePermissions(volumeID, nodeID);

	// get the root directory
	VolumeManager* volumeManager = VolumeManager::GetDefault();
	Directory* rootDir;
	status_t error = volumeManager->LoadDirectory(volumeID, nodeID, &rootDir);
	if (error != B_OK)
		return error;

	// register with the volume manager
	error = volumeManager->AddClientVolume(this);
	if (error != B_OK) {
		Unmount();
		return error;
	}
	fMounted = true;

	// notify the statistics manager
	StatisticsManager::GetDefault()->ShareMounted(fShare,
		fSecurityContext->GetUser());

	return B_OK;
}

void NetlinkHandler::onEvent(NetlinkEvent *evt) {
    VolumeManager *vm = VolumeManager::Instance();
    const char *subsys = evt->getSubsystem();

    if (!subsys) {
        SLOGW("No subsystem found in netlink event");
        return;
    }

    if (!strcmp(subsys, "block")) {
        vm->handleBlockEvent(evt);
    } else if (!strcmp(subsys, "switch")) {
        vm->handleSwitchEvent(evt);
    } else if (!strcmp(subsys, "usb_composite")) {
        vm->handleUsbCompositeEvent(evt);
    } else if (!strcmp(subsys, "battery")) {
    } else if (!strcmp(subsys, "power_supply")) {
    }
}

// netfs_unmount
static
int
netfs_unmount(void *ns)
{
	VolumeManager* volumeManager = (VolumeManager*)ns;

	PRINT("netfs_unmount()\n");

	volumeManager->UnmountRootVolume();
	delete volumeManager;

	#ifdef DEBUG_OBJECT_TRACKING
		ObjectTracker::ExitDefault();
	#endif

	PRINT("netfs_unmount() done\n");

	exit_debugging();
	return B_OK;
}